diff options
Diffstat (limited to 'libcli/smb/smbXcli_base.c')
| -rw-r--r-- | libcli/smb/smbXcli_base.c | 7006 |
1 files changed, 7006 insertions, 0 deletions
diff --git a/libcli/smb/smbXcli_base.c b/libcli/smb/smbXcli_base.c new file mode 100644 index 0000000..444963e --- /dev/null +++ b/libcli/smb/smbXcli_base.c @@ -0,0 +1,7006 @@ +/* + Unix SMB/CIFS implementation. + Infrastructure for async SMB client requests + Copyright (C) Volker Lendecke 2008 + Copyright (C) Stefan Metzmacher 2011 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "system/network.h" +#include "../lib/async_req/async_sock.h" +#include "../lib/util/tevent_ntstatus.h" +#include "../lib/util/tevent_unix.h" +#include "lib/util/util_net.h" +#include "lib/util/dlinklist.h" +#include "lib/util/iov_buf.h" +#include "../libcli/smb/smb_common.h" +#include "../libcli/smb/smb_seal.h" +#include "../libcli/smb/smb_signing.h" +#include "../libcli/smb/read_smb.h" +#include "smbXcli_base.h" +#include "librpc/ndr/libndr.h" +#include "libcli/smb/smb2_negotiate_context.h" +#include "libcli/smb/smb2_signing.h" + +#include "lib/crypto/gnutls_helpers.h" +#include <gnutls/gnutls.h> +#include <gnutls/crypto.h> + +struct smbXcli_conn; +struct smbXcli_req; +struct smbXcli_session; +struct smbXcli_tcon; + +struct smbXcli_conn { + int sock_fd; + struct sockaddr_storage local_ss; + struct sockaddr_storage remote_ss; + const char *remote_name; + + struct tevent_queue *outgoing; + struct tevent_req **pending; + struct tevent_req *read_smb_req; + struct tevent_req *suicide_req; + + enum protocol_types min_protocol; + enum protocol_types max_protocol; + enum protocol_types protocol; + bool allow_signing; + bool desire_signing; + bool mandatory_signing; + + /* + * The incoming dispatch function should return: + * - NT_STATUS_RETRY, if more incoming PDUs are expected. + * - NT_STATUS_OK, if no more processing is desired, e.g. + * the dispatch function called + * tevent_req_done(). + * - All other return values disconnect the connection. + */ + NTSTATUS (*dispatch_incoming)(struct smbXcli_conn *conn, + TALLOC_CTX *tmp_mem, + uint8_t *inbuf); + + struct { + struct { + uint32_t capabilities; + uint32_t max_xmit; + } client; + + struct { + uint32_t capabilities; + uint32_t max_xmit; + uint16_t max_mux; + uint16_t security_mode; + bool readbraw; + bool writebraw; + bool lockread; + bool writeunlock; + uint32_t session_key; + struct GUID guid; + DATA_BLOB gss_blob; + uint8_t challenge[8]; + const char *workgroup; + const char *name; + int time_zone; + NTTIME system_time; + } server; + + uint32_t capabilities; + uint32_t max_xmit; + + uint16_t mid; + + struct smb1_signing_state *signing; + struct smb_trans_enc_state *trans_enc; + + struct tevent_req *read_braw_req; + } smb1; + + struct { + struct { + uint32_t capabilities; + uint16_t security_mode; + struct GUID guid; + struct smb311_capabilities smb3_capabilities; + } client; + + struct { + uint32_t capabilities; + uint16_t security_mode; + struct GUID guid; + uint32_t max_trans_size; + uint32_t max_read_size; + uint32_t max_write_size; + NTTIME system_time; + NTTIME start_time; + DATA_BLOB gss_blob; + uint16_t sign_algo; + uint16_t cipher; + } server; + + uint64_t mid; + uint16_t cur_credits; + uint16_t max_credits; + + uint32_t cc_chunk_len; + uint32_t cc_max_chunks; + + uint8_t io_priority; + + bool force_channel_sequence; + + uint8_t preauth_sha512[64]; + } smb2; + + struct smbXcli_session *sessions; +}; + +struct smb2cli_session { + uint64_t session_id; + uint16_t session_flags; + struct smb2_signing_key *application_key; + struct smb2_signing_key *signing_key; + bool should_sign; + bool should_encrypt; + struct smb2_signing_key *encryption_key; + struct smb2_signing_key *decryption_key; + uint64_t nonce_high_random; + uint64_t nonce_high_max; + uint64_t nonce_high; + uint64_t nonce_low; + uint16_t channel_sequence; + bool replay_active; + bool require_signed_response; +}; + +struct smbXcli_session { + struct smbXcli_session *prev, *next; + struct smbXcli_conn *conn; + + struct { + uint16_t session_id; + uint16_t action; + DATA_BLOB application_key; + bool protected_key; + } smb1; + + struct smb2cli_session *smb2; + + struct { + struct smb2_signing_key *signing_key; + uint8_t preauth_sha512[64]; + } smb2_channel; + + /* + * this should be a short term hack + * until the upper layers have implemented + * re-authentication. + */ + bool disconnect_expired; +}; + +struct smbXcli_tcon { + bool is_smb1; + uint32_t fs_attributes; + + struct { + uint16_t tcon_id; + uint16_t optional_support; + uint32_t maximal_access; + uint32_t guest_maximal_access; + char *service; + char *fs_type; + } smb1; + + struct { + uint32_t tcon_id; + uint8_t type; + uint32_t flags; + uint32_t capabilities; + uint32_t maximal_access; + bool should_sign; + bool should_encrypt; + } smb2; +}; + +struct smbXcli_req_state { + struct tevent_context *ev; + struct smbXcli_conn *conn; + struct smbXcli_session *session; /* maybe NULL */ + struct smbXcli_tcon *tcon; /* maybe NULL */ + + uint8_t length_hdr[4]; + + bool one_way; + + uint8_t *inbuf; + + struct tevent_req *write_req; + + struct timeval endtime; + + struct { + /* Space for the header including the wct */ + uint8_t hdr[HDR_VWV]; + + /* + * For normal requests, smb1cli_req_send chooses a mid. + * SecondaryV trans requests need to use the mid of the primary + * request, so we need a place to store it. + * Assume it is set if != 0. + */ + uint16_t mid; + + uint16_t *vwv; + uint8_t bytecount_buf[2]; + +#define MAX_SMB_IOV 10 + /* length_hdr, hdr, words, byte_count, buffers */ + struct iovec iov[1 + 3 + MAX_SMB_IOV]; + int iov_count; + + bool one_way_seqnum; + uint32_t seqnum; + struct tevent_req **chained_requests; + + uint8_t recv_cmd; + NTSTATUS recv_status; + /* always an array of 3 talloc elements */ + struct iovec *recv_iov; + } smb1; + + struct { + const uint8_t *fixed; + uint16_t fixed_len; + const uint8_t *dyn; + uint32_t dyn_len; + + uint8_t transform[SMB2_TF_HDR_SIZE]; + uint8_t hdr[SMB2_HDR_BODY]; + uint8_t pad[7]; /* padding space for compounding */ + + /* + * always an array of 3 talloc elements + * (without a SMB2_TRANSFORM header!) + * + * HDR, BODY, DYN + */ + struct iovec *recv_iov; + + /* + * the expected max for the response dyn_len + */ + uint32_t max_dyn_len; + + uint16_t credit_charge; + + bool should_sign; + bool should_encrypt; + uint64_t encryption_session_id; + + bool signing_skipped; + bool require_signed_response; + bool notify_async; + bool got_async; + uint16_t cancel_flags; + uint64_t cancel_mid; + uint64_t cancel_aid; + } smb2; +}; + +static int smbXcli_conn_destructor(struct smbXcli_conn *conn) +{ + /* + * NT_STATUS_OK, means we do not notify the callers + */ + smbXcli_conn_disconnect(conn, NT_STATUS_OK); + + while (conn->sessions) { + conn->sessions->conn = NULL; + DLIST_REMOVE(conn->sessions, conn->sessions); + } + + if (conn->smb1.trans_enc) { + TALLOC_FREE(conn->smb1.trans_enc); + } + + return 0; +} + +struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx, + int fd, + const char *remote_name, + enum smb_signing_setting signing_state, + uint32_t smb1_capabilities, + struct GUID *client_guid, + uint32_t smb2_capabilities, + const struct smb311_capabilities *smb3_capabilities) +{ + struct smbXcli_conn *conn = NULL; + void *ss = NULL; + struct sockaddr *sa = NULL; + socklen_t sa_length; + int ret; + + if (smb3_capabilities != NULL) { + const struct smb3_signing_capabilities *sign_algos = + &smb3_capabilities->signing; + const struct smb3_encryption_capabilities *ciphers = + &smb3_capabilities->encryption; + + SMB_ASSERT(sign_algos->num_algos <= SMB3_SIGNING_CAPABILITIES_MAX_ALGOS); + SMB_ASSERT(ciphers->num_algos <= SMB3_ENCRYTION_CAPABILITIES_MAX_ALGOS); + } + + conn = talloc_zero(mem_ctx, struct smbXcli_conn); + if (!conn) { + return NULL; + } + + ret = set_blocking(fd, false); + if (ret < 0) { + goto error; + } + conn->sock_fd = fd; + + conn->remote_name = talloc_strdup(conn, remote_name); + if (conn->remote_name == NULL) { + goto error; + } + + ss = (void *)&conn->local_ss; + sa = (struct sockaddr *)ss; + sa_length = sizeof(conn->local_ss); + ret = getsockname(fd, sa, &sa_length); + if (ret == -1) { + goto error; + } + ss = (void *)&conn->remote_ss; + sa = (struct sockaddr *)ss; + sa_length = sizeof(conn->remote_ss); + ret = getpeername(fd, sa, &sa_length); + if (ret == -1) { + goto error; + } + + conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing"); + if (conn->outgoing == NULL) { + goto error; + } + conn->pending = NULL; + + conn->min_protocol = PROTOCOL_NONE; + conn->max_protocol = PROTOCOL_NONE; + conn->protocol = PROTOCOL_NONE; + + switch (signing_state) { + case SMB_SIGNING_OFF: + /* never */ + conn->allow_signing = false; + conn->desire_signing = false; + conn->mandatory_signing = false; + break; + case SMB_SIGNING_DEFAULT: + case SMB_SIGNING_IF_REQUIRED: + /* if the server requires it */ + conn->allow_signing = true; + conn->desire_signing = false; + conn->mandatory_signing = false; + break; + case SMB_SIGNING_DESIRED: + /* if the server desires it */ + conn->allow_signing = true; + conn->desire_signing = true; + conn->mandatory_signing = false; + break; + case SMB_SIGNING_IPC_DEFAULT: + case SMB_SIGNING_REQUIRED: + /* always */ + conn->allow_signing = true; + conn->desire_signing = true; + conn->mandatory_signing = true; + break; + } + + conn->smb1.client.capabilities = smb1_capabilities; + conn->smb1.client.max_xmit = UINT16_MAX; + + conn->smb1.capabilities = conn->smb1.client.capabilities; + conn->smb1.max_xmit = 1024; + + conn->smb1.mid = 1; + + /* initialise signing */ + conn->smb1.signing = smb1_signing_init(conn, + conn->allow_signing, + conn->desire_signing, + conn->mandatory_signing); + if (!conn->smb1.signing) { + goto error; + } + + conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED; + if (conn->mandatory_signing) { + conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED; + } + if (client_guid) { + conn->smb2.client.guid = *client_guid; + } + conn->smb2.client.capabilities = smb2_capabilities; + if (smb3_capabilities != NULL) { + conn->smb2.client.smb3_capabilities = *smb3_capabilities; + } + + conn->smb2.cur_credits = 1; + conn->smb2.max_credits = 0; + conn->smb2.io_priority = 1; + + /* + * Samba and Windows servers accept a maximum of 16 MiB with a maximum + * chunk length of 1 MiB. + */ + conn->smb2.cc_chunk_len = 1024 * 1024; + conn->smb2.cc_max_chunks = 16; + + talloc_set_destructor(conn, smbXcli_conn_destructor); + return conn; + + error: + TALLOC_FREE(conn); + return NULL; +} + +bool smbXcli_conn_is_connected(struct smbXcli_conn *conn) +{ + if (conn == NULL) { + return false; + } + + if (conn->sock_fd == -1) { + return false; + } + + return true; +} + +enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn) +{ + return conn->protocol; +} + +bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn) +{ + if (conn->protocol >= PROTOCOL_SMB2_02) { + return true; + } + + if (conn->smb1.capabilities & CAP_UNICODE) { + return true; + } + + return false; +} + +bool smbXcli_conn_signing_mandatory(struct smbXcli_conn *conn) +{ + return conn->mandatory_signing; +} + +/* + * [MS-SMB] 2.2.2.3.5 - SMB1 support for passing through + * query/set commands to the file system + */ +bool smbXcli_conn_support_passthrough(struct smbXcli_conn *conn) +{ + if (conn->protocol >= PROTOCOL_SMB2_02) { + return true; + } + + if (conn->smb1.capabilities & CAP_W2K_SMBS) { + return true; + } + + return false; +} + +void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options) +{ + set_socket_options(conn->sock_fd, options); +} + +const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn) +{ + return &conn->local_ss; +} + +const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn) +{ + return &conn->remote_ss; +} + +const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn) +{ + return conn->remote_name; +} + +uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn) +{ + if (conn->protocol >= PROTOCOL_SMB2_02) { + /* + * TODO... + */ + return 1; + } + + return conn->smb1.server.max_mux; +} + +NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn) +{ + if (conn->protocol >= PROTOCOL_SMB2_02) { + return conn->smb2.server.system_time; + } + + return conn->smb1.server.system_time; +} + +const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn) +{ + if (conn->protocol >= PROTOCOL_SMB2_02) { + return &conn->smb2.server.gss_blob; + } + + return &conn->smb1.server.gss_blob; +} + +const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn) +{ + if (conn->protocol >= PROTOCOL_SMB2_02) { + return &conn->smb2.server.guid; + } + + return &conn->smb1.server.guid; +} + +bool smbXcli_conn_get_force_channel_sequence(struct smbXcli_conn *conn) +{ + return conn->smb2.force_channel_sequence; +} + +void smbXcli_conn_set_force_channel_sequence(struct smbXcli_conn *conn, + bool v) +{ + conn->smb2.force_channel_sequence = v; +} + +struct smbXcli_conn_samba_suicide_state { + struct smbXcli_conn *conn; + struct iovec iov; + uint8_t buf[9]; + struct tevent_req *write_req; +}; + +static void smbXcli_conn_samba_suicide_cleanup(struct tevent_req *req, + enum tevent_req_state req_state); +static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq); + +struct tevent_req *smbXcli_conn_samba_suicide_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbXcli_conn *conn, + uint8_t exitcode) +{ + struct tevent_req *req, *subreq; + struct smbXcli_conn_samba_suicide_state *state; + + req = tevent_req_create(mem_ctx, &state, + struct smbXcli_conn_samba_suicide_state); + if (req == NULL) { + return NULL; + } + state->conn = conn; + SIVAL(state->buf, 4, SMB_SUICIDE_PACKET); + SCVAL(state->buf, 8, exitcode); + _smb_setlen_nbt(state->buf, sizeof(state->buf)-4); + + if (conn->suicide_req != NULL) { + tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER); + return tevent_req_post(req, ev); + } + + state->iov.iov_base = state->buf; + state->iov.iov_len = sizeof(state->buf); + + subreq = writev_send(state, ev, conn->outgoing, conn->sock_fd, + false, &state->iov, 1); + if (tevent_req_nomem(subreq, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback(subreq, smbXcli_conn_samba_suicide_done, req); + state->write_req = subreq; + + tevent_req_set_cleanup_fn(req, smbXcli_conn_samba_suicide_cleanup); + + /* + * We need to use tevent_req_defer_callback() + * in order to allow smbXcli_conn_disconnect() + * to do a safe cleanup. + */ + tevent_req_defer_callback(req, ev); + conn->suicide_req = req; + + return req; +} + +static void smbXcli_conn_samba_suicide_cleanup(struct tevent_req *req, + enum tevent_req_state req_state) +{ + struct smbXcli_conn_samba_suicide_state *state = tevent_req_data( + req, struct smbXcli_conn_samba_suicide_state); + + TALLOC_FREE(state->write_req); + + if (state->conn == NULL) { + return; + } + + if (state->conn->suicide_req == req) { + state->conn->suicide_req = NULL; + } + state->conn = NULL; +} + +static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq) +{ + struct tevent_req *req = tevent_req_callback_data( + subreq, struct tevent_req); + struct smbXcli_conn_samba_suicide_state *state = tevent_req_data( + req, struct smbXcli_conn_samba_suicide_state); + ssize_t nwritten; + int err; + + state->write_req = NULL; + + nwritten = writev_recv(subreq, &err); + TALLOC_FREE(subreq); + if (nwritten == -1) { + /* here, we need to notify all pending requests */ + NTSTATUS status = map_nt_error_from_unix_common(err); + smbXcli_conn_disconnect(state->conn, status); + return; + } + tevent_req_done(req); +} + +NTSTATUS smbXcli_conn_samba_suicide_recv(struct tevent_req *req) +{ + return tevent_req_simple_recv_ntstatus(req); +} + +NTSTATUS smbXcli_conn_samba_suicide(struct smbXcli_conn *conn, + uint8_t exitcode) +{ + TALLOC_CTX *frame = talloc_stackframe(); + struct tevent_context *ev; + struct tevent_req *req; + NTSTATUS status = NT_STATUS_NO_MEMORY; + bool ok; + + if (smbXcli_conn_has_async_calls(conn)) { + /* + * Can't use sync call while an async call is in flight + */ + status = NT_STATUS_INVALID_PARAMETER_MIX; + goto fail; + } + ev = samba_tevent_context_init(frame); + if (ev == NULL) { + goto fail; + } + req = smbXcli_conn_samba_suicide_send(frame, ev, conn, exitcode); + if (req == NULL) { + goto fail; + } + ok = tevent_req_poll_ntstatus(req, ev, &status); + if (!ok) { + goto fail; + } + status = smbXcli_conn_samba_suicide_recv(req); + fail: + TALLOC_FREE(frame); + return status; +} + +uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn) +{ + return conn->smb1.capabilities; +} + +uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn) +{ + return conn->smb1.max_xmit; +} + +bool smb1cli_conn_req_possible(struct smbXcli_conn *conn) +{ + size_t pending = talloc_array_length(conn->pending); + uint16_t possible = conn->smb1.server.max_mux; + + if (pending >= possible) { + return false; + } + + return true; +} + +uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn) +{ + return conn->smb1.server.session_key; +} + +const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn) +{ + return conn->smb1.server.challenge; +} + +uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn) +{ + return conn->smb1.server.security_mode; +} + +bool smb1cli_conn_server_readbraw(struct smbXcli_conn *conn) +{ + return conn->smb1.server.readbraw; +} + +bool smb1cli_conn_server_writebraw(struct smbXcli_conn *conn) +{ + return conn->smb1.server.writebraw; +} + +bool smb1cli_conn_server_lockread(struct smbXcli_conn *conn) +{ + return conn->smb1.server.lockread; +} + +bool smb1cli_conn_server_writeunlock(struct smbXcli_conn *conn) +{ + return conn->smb1.server.writeunlock; +} + +int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn) +{ + return conn->smb1.server.time_zone; +} + +bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn, + const DATA_BLOB user_session_key, + const DATA_BLOB response) +{ + return smb1_signing_activate(conn->smb1.signing, + user_session_key, + response); +} + +bool smb1cli_conn_check_signing(struct smbXcli_conn *conn, + const uint8_t *buf, uint32_t seqnum) +{ + const uint8_t *hdr = buf + NBT_HDR_SIZE; + size_t len = smb_len_nbt(buf); + + return smb1_signing_check_pdu(conn->smb1.signing, hdr, len, seqnum); +} + +bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn) +{ + return smb1_signing_is_active(conn->smb1.signing); +} + +void smb1cli_conn_set_encryption(struct smbXcli_conn *conn, + struct smb_trans_enc_state *es) +{ + /* Replace the old state, if any. */ + if (conn->smb1.trans_enc) { + TALLOC_FREE(conn->smb1.trans_enc); + } + conn->smb1.trans_enc = es; +} + +bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn) +{ + return common_encryption_on(conn->smb1.trans_enc); +} + + +static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr) +{ + uint32_t flags2 = SVAL(hdr, HDR_FLG2); + NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS)); + + if (NT_STATUS_IS_OK(status)) { + return NT_STATUS_OK; + } + + if (flags2 & FLAGS2_32_BIT_ERROR_CODES) { + return status; + } + + return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR)); +} + +/** + * Is the SMB command able to hold an AND_X successor + * @param[in] cmd The SMB command in question + * @retval Can we add a chained request after "cmd"? + */ +bool smb1cli_is_andx_req(uint8_t cmd) +{ + switch (cmd) { + case SMBtconX: + case SMBlockingX: + case SMBopenX: + case SMBreadX: + case SMBwriteX: + case SMBsesssetupX: + case SMBulogoffX: + case SMBntcreateX: + return true; + break; + default: + break; + } + + return false; +} + +static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn) +{ + size_t num_pending = talloc_array_length(conn->pending); + uint16_t result; + + if (conn->protocol == PROTOCOL_NONE) { + /* + * This is what windows sends on the SMB1 Negprot request + * and some vendors reuse the SMB1 MID as SMB2 sequence number. + */ + return 0; + } + + while (true) { + size_t i; + + result = conn->smb1.mid++; + if ((result == 0) || (result == 0xffff)) { + continue; + } + + for (i=0; i<num_pending; i++) { + if (result == smb1cli_req_mid(conn->pending[i])) { + break; + } + } + + if (i == num_pending) { + return result; + } + } +} + +static NTSTATUS smbXcli_req_cancel_write_req(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + struct smbXcli_conn *conn = state->conn; + size_t num_pending = talloc_array_length(conn->pending); + ssize_t ret; + int err; + bool ok; + + if (state->write_req == NULL) { + return NT_STATUS_OK; + } + + /* + * Check if it's possible to cancel the request. + * If the result is true it's not too late. + * See writev_cancel(). + */ + ok = tevent_req_cancel(state->write_req); + if (ok) { + TALLOC_FREE(state->write_req); + + if (conn->protocol >= PROTOCOL_SMB2_02) { + /* + * SMB2 has a sane signing state. + */ + return NT_STATUS_OK; + } + + if (num_pending > 1) { + /* + * We have more pending requests following us. This + * means the signing state will be broken for them. + * + * As a solution we could add the requests directly to + * our outgoing queue and do the signing in the trigger + * function and then use writev_send() without passing a + * queue. That way we'll only sign packets we're most + * likely send to the wire. + */ + return NT_STATUS_REQUEST_OUT_OF_SEQUENCE; + } + + /* + * If we're the only request that's + * pending, we're able to recover the signing + * state. + */ + smb1_signing_cancel_reply(conn->smb1.signing, + state->smb1.one_way_seqnum); + return NT_STATUS_OK; + } + + ret = writev_recv(state->write_req, &err); + TALLOC_FREE(state->write_req); + if (ret == -1) { + return map_nt_error_from_unix_common(err); + } + + return NT_STATUS_OK; +} + +void smbXcli_req_unset_pending(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + struct smbXcli_conn *conn = state->conn; + size_t num_pending = talloc_array_length(conn->pending); + size_t i; + NTSTATUS cancel_status; + + cancel_status = smbXcli_req_cancel_write_req(req); + + if (state->smb1.mid != 0) { + /* + * This is a [nt]trans[2] request which waits + * for more than one reply. + */ + if (!NT_STATUS_IS_OK(cancel_status)) { + /* + * If the write_req cancel didn't work + * we can't use the connection anymore. + */ + smbXcli_conn_disconnect(conn, cancel_status); + return; + } + return; + } + + tevent_req_set_cleanup_fn(req, NULL); + + if (num_pending == 1) { + /* + * The pending read_smb tevent_req is a child of + * conn->pending. So if nothing is pending anymore, we need to + * delete the socket read fde. + */ + /* TODO: smbXcli_conn_cancel_read_req */ + TALLOC_FREE(conn->pending); + conn->read_smb_req = NULL; + + if (!NT_STATUS_IS_OK(cancel_status)) { + /* + * If the write_req cancel didn't work + * we can't use the connection anymore. + */ + smbXcli_conn_disconnect(conn, cancel_status); + return; + } + return; + } + + for (i=0; i<num_pending; i++) { + if (req == conn->pending[i]) { + break; + } + } + if (i == num_pending) { + /* + * Something's seriously broken. Just returning here is the + * right thing nevertheless, the point of this routine is to + * remove ourselves from conn->pending. + */ + + if (!NT_STATUS_IS_OK(cancel_status)) { + /* + * If the write_req cancel didn't work + * we can't use the connection anymore. + */ + smbXcli_conn_disconnect(conn, cancel_status); + return; + } + return; + } + + /* + * Remove ourselves from the conn->pending array + */ + for (; i < (num_pending - 1); i++) { + conn->pending[i] = conn->pending[i+1]; + } + + /* + * No NULL check here, we're shrinking by sizeof(void *), and + * talloc_realloc just adjusts the size for this. + */ + conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *, + num_pending - 1); + + if (!NT_STATUS_IS_OK(cancel_status)) { + /* + * If the write_req cancel didn't work + * we can't use the connection anymore. + */ + smbXcli_conn_disconnect(conn, cancel_status); + return; + } + return; +} + +static void smbXcli_req_cleanup(struct tevent_req *req, + enum tevent_req_state req_state) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + struct smbXcli_conn *conn = state->conn; + NTSTATUS cancel_status; + + switch (req_state) { + case TEVENT_REQ_RECEIVED: + /* + * Make sure we really remove it from + * the pending array on destruction. + * + * smbXcli_req_unset_pending() calls + * smbXcli_req_cancel_write_req() internal + */ + state->smb1.mid = 0; + smbXcli_req_unset_pending(req); + return; + default: + cancel_status = smbXcli_req_cancel_write_req(req); + if (!NT_STATUS_IS_OK(cancel_status)) { + /* + * If the write_req cancel didn't work + * we can't use the connection anymore. + */ + smbXcli_conn_disconnect(conn, cancel_status); + return; + } + return; + } +} + +static bool smb1cli_req_cancel(struct tevent_req *req); +static bool smb2cli_req_cancel(struct tevent_req *req); + +static bool smbXcli_req_cancel(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + if (!smbXcli_conn_is_connected(state->conn)) { + return false; + } + + if (state->conn->protocol == PROTOCOL_NONE) { + return false; + } + + if (state->conn->protocol >= PROTOCOL_SMB2_02) { + return smb2cli_req_cancel(req); + } + + return smb1cli_req_cancel(req); +} + +static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn); + +bool smbXcli_req_set_pending(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + struct smbXcli_conn *conn; + struct tevent_req **pending; + size_t num_pending; + + conn = state->conn; + + if (!smbXcli_conn_is_connected(conn)) { + return false; + } + + num_pending = talloc_array_length(conn->pending); + + pending = talloc_realloc(conn, conn->pending, struct tevent_req *, + num_pending+1); + if (pending == NULL) { + return false; + } + pending[num_pending] = req; + conn->pending = pending; + tevent_req_set_cleanup_fn(req, smbXcli_req_cleanup); + tevent_req_set_cancel_fn(req, smbXcli_req_cancel); + + if (!smbXcli_conn_receive_next(conn)) { + /* + * the caller should notify the current request + * + * And all other pending requests get notified + * by smbXcli_conn_disconnect(). + */ + smbXcli_req_unset_pending(req); + smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY); + return false; + } + + return true; +} + +static void smbXcli_conn_received(struct tevent_req *subreq); + +static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn) +{ + size_t num_pending = talloc_array_length(conn->pending); + struct tevent_req *req; + struct smbXcli_req_state *state; + + if (conn->read_smb_req != NULL) { + return true; + } + + if (num_pending == 0) { + if (conn->smb2.mid < UINT64_MAX) { + /* no more pending requests, so we are done for now */ + return true; + } + + /* + * If there are no more SMB2 requests possible, + * because we are out of message ids, + * we need to disconnect. + */ + smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED); + return true; + } + + req = conn->pending[0]; + state = tevent_req_data(req, struct smbXcli_req_state); + + /* + * We're the first ones, add the read_smb request that waits for the + * answer from the server + */ + conn->read_smb_req = read_smb_send(conn->pending, + state->ev, + conn->sock_fd); + if (conn->read_smb_req == NULL) { + return false; + } + tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn); + return true; +} + +void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status) +{ + struct smbXcli_session *session; + int sock_fd = conn->sock_fd; + + tevent_queue_stop(conn->outgoing); + + conn->sock_fd = -1; + + session = conn->sessions; + if (talloc_array_length(conn->pending) == 0) { + /* + * if we do not have pending requests + * there is no need to update the channel_sequence + */ + session = NULL; + } + for (; session; session = session->next) { + smb2cli_session_increment_channel_sequence(session); + } + + if (conn->suicide_req != NULL) { + /* + * smbXcli_conn_samba_suicide_send() + * used tevent_req_defer_callback() already. + */ + if (!NT_STATUS_IS_OK(status)) { + tevent_req_nterror(conn->suicide_req, status); + } + conn->suicide_req = NULL; + } + + /* + * Cancel all pending requests. We do not do a for-loop walking + * conn->pending because that array changes in + * smbXcli_req_unset_pending. + */ + while (conn->pending != NULL && + talloc_array_length(conn->pending) > 0) { + struct tevent_req *req; + struct smbXcli_req_state *state; + struct tevent_req **chain; + size_t num_chained; + size_t i; + + req = conn->pending[0]; + state = tevent_req_data(req, struct smbXcli_req_state); + + if (state->smb1.chained_requests == NULL) { + bool in_progress; + + /* + * We're dead. No point waiting for trans2 + * replies. + */ + state->smb1.mid = 0; + + smbXcli_req_unset_pending(req); + + if (NT_STATUS_IS_OK(status)) { + /* do not notify the callers */ + continue; + } + + in_progress = tevent_req_is_in_progress(req); + if (!in_progress) { + /* + * already finished + */ + continue; + } + + /* + * we need to defer the callback, because we may notify + * more then one caller. + */ + tevent_req_defer_callback(req, state->ev); + tevent_req_nterror(req, status); + continue; + } + + chain = talloc_move(conn, &state->smb1.chained_requests); + num_chained = talloc_array_length(chain); + + for (i=0; i<num_chained; i++) { + bool in_progress; + + req = chain[i]; + state = tevent_req_data(req, struct smbXcli_req_state); + + /* + * We're dead. No point waiting for trans2 + * replies. + */ + state->smb1.mid = 0; + + smbXcli_req_unset_pending(req); + + if (NT_STATUS_IS_OK(status)) { + /* do not notify the callers */ + continue; + } + + in_progress = tevent_req_is_in_progress(req); + if (!in_progress) { + /* + * already finished + */ + continue; + } + + /* + * we need to defer the callback, because we may notify + * more than one caller. + */ + tevent_req_defer_callback(req, state->ev); + tevent_req_nterror(req, status); + } + TALLOC_FREE(chain); + } + + if (sock_fd != -1) { + close(sock_fd); + } +} + +/* + * Fetch a smb request's mid. Only valid after the request has been sent by + * smb1cli_req_send(). + */ +uint16_t smb1cli_req_mid(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + if (state->smb1.mid != 0) { + return state->smb1.mid; + } + + return SVAL(state->smb1.hdr, HDR_MID); +} + +void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + state->smb1.mid = mid; +} + +uint32_t smb1cli_req_seqnum(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + return state->smb1.seqnum; +} + +void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + state->smb1.seqnum = seqnum; +} + +static size_t smbXcli_iov_len(const struct iovec *iov, int count) +{ + ssize_t ret = iov_buflen(iov, count); + + /* Ignore the overflow case for now ... */ + return ret; +} + +static void smb1cli_req_flags(enum protocol_types protocol, + uint32_t smb1_capabilities, + uint8_t smb_command, + uint8_t additional_flags, + uint8_t clear_flags, + uint8_t *_flags, + uint16_t additional_flags2, + uint16_t clear_flags2, + uint16_t *_flags2) +{ + uint8_t flags = 0; + uint16_t flags2 = 0; + + if (protocol >= PROTOCOL_LANMAN1) { + flags |= FLAG_CASELESS_PATHNAMES; + flags |= FLAG_CANONICAL_PATHNAMES; + } + + if (protocol >= PROTOCOL_LANMAN2) { + flags2 |= FLAGS2_LONG_PATH_COMPONENTS; + flags2 |= FLAGS2_EXTENDED_ATTRIBUTES; + } + + if (protocol >= PROTOCOL_NT1) { + flags2 |= FLAGS2_IS_LONG_NAME; + + if (smb1_capabilities & CAP_UNICODE) { + flags2 |= FLAGS2_UNICODE_STRINGS; + } + if (smb1_capabilities & CAP_STATUS32) { + flags2 |= FLAGS2_32_BIT_ERROR_CODES; + } + if (smb1_capabilities & CAP_EXTENDED_SECURITY) { + flags2 |= FLAGS2_EXTENDED_SECURITY; + } + } + + flags |= additional_flags; + flags &= ~clear_flags; + flags2 |= additional_flags2; + flags2 &= ~clear_flags2; + + *_flags = flags; + *_flags2 = flags2; +} + +static void smb1cli_req_cancel_done(struct tevent_req *subreq); + +static bool smb1cli_req_cancel(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + uint8_t flags; + uint16_t flags2; + uint32_t pid; + uint16_t mid; + struct tevent_req *subreq; + NTSTATUS status; + + flags = CVAL(state->smb1.hdr, HDR_FLG); + flags2 = SVAL(state->smb1.hdr, HDR_FLG2); + pid = SVAL(state->smb1.hdr, HDR_PID); + pid |= SVAL(state->smb1.hdr, HDR_PIDHIGH)<<16; + mid = SVAL(state->smb1.hdr, HDR_MID); + + subreq = smb1cli_req_create(state, state->ev, + state->conn, + SMBntcancel, + flags, 0, + flags2, 0, + 0, /* timeout */ + pid, + state->tcon, + state->session, + 0, NULL, /* vwv */ + 0, NULL); /* bytes */ + if (subreq == NULL) { + return false; + } + smb1cli_req_set_mid(subreq, mid); + + status = smb1cli_req_chain_submit(&subreq, 1); + if (!NT_STATUS_IS_OK(status)) { + TALLOC_FREE(subreq); + return false; + } + smb1cli_req_set_mid(subreq, 0); + + tevent_req_set_callback(subreq, smb1cli_req_cancel_done, NULL); + + return true; +} + +static void smb1cli_req_cancel_done(struct tevent_req *subreq) +{ + /* we do not care about the result */ + TALLOC_FREE(subreq); +} + +struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbXcli_conn *conn, + uint8_t smb_command, + uint8_t additional_flags, + uint8_t clear_flags, + uint16_t additional_flags2, + uint16_t clear_flags2, + uint32_t timeout_msec, + uint32_t pid, + struct smbXcli_tcon *tcon, + struct smbXcli_session *session, + uint8_t wct, uint16_t *vwv, + int iov_count, + struct iovec *bytes_iov) +{ + struct tevent_req *req; + struct smbXcli_req_state *state; + uint8_t flags = 0; + uint16_t flags2 = 0; + uint16_t uid = 0; + uint16_t tid = 0; + ssize_t num_bytes; + + if (iov_count > MAX_SMB_IOV) { + /* + * Should not happen :-) + */ + return NULL; + } + + req = tevent_req_create(mem_ctx, &state, + struct smbXcli_req_state); + if (req == NULL) { + return NULL; + } + state->ev = ev; + state->conn = conn; + state->session = session; + state->tcon = tcon; + + if (session) { + uid = session->smb1.session_id; + } + + if (tcon) { + tid = tcon->smb1.tcon_id; + + if (tcon->fs_attributes & FILE_CASE_SENSITIVE_SEARCH) { + clear_flags |= FLAG_CASELESS_PATHNAMES; + } else { + /* Default setting, case insensitive. */ + additional_flags |= FLAG_CASELESS_PATHNAMES; + } + + if (smbXcli_conn_dfs_supported(conn) && + smbXcli_tcon_is_dfs_share(tcon)) + { + additional_flags2 |= FLAGS2_DFS_PATHNAMES; + } + } + + state->smb1.recv_cmd = 0xFF; + state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR; + state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3); + if (state->smb1.recv_iov == NULL) { + TALLOC_FREE(req); + return NULL; + } + + smb1cli_req_flags(conn->protocol, + conn->smb1.capabilities, + smb_command, + additional_flags, + clear_flags, + &flags, + additional_flags2, + clear_flags2, + &flags2); + + SIVAL(state->smb1.hdr, 0, SMB_MAGIC); + SCVAL(state->smb1.hdr, HDR_COM, smb_command); + SIVAL(state->smb1.hdr, HDR_RCLS, NT_STATUS_V(NT_STATUS_OK)); + SCVAL(state->smb1.hdr, HDR_FLG, flags); + SSVAL(state->smb1.hdr, HDR_FLG2, flags2); + SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16); + SSVAL(state->smb1.hdr, HDR_TID, tid); + SSVAL(state->smb1.hdr, HDR_PID, pid); + SSVAL(state->smb1.hdr, HDR_UID, uid); + SSVAL(state->smb1.hdr, HDR_MID, 0); /* this comes later */ + SCVAL(state->smb1.hdr, HDR_WCT, wct); + + state->smb1.vwv = vwv; + + num_bytes = iov_buflen(bytes_iov, iov_count); + if (num_bytes == -1) { + /* + * I'd love to add a check for num_bytes<=UINT16_MAX here, but + * the smbclient->samba connections can lie and transfer more. + */ + TALLOC_FREE(req); + return NULL; + } + + SSVAL(state->smb1.bytecount_buf, 0, num_bytes); + + state->smb1.iov[0].iov_base = (void *)state->length_hdr; + state->smb1.iov[0].iov_len = sizeof(state->length_hdr); + state->smb1.iov[1].iov_base = (void *)state->smb1.hdr; + state->smb1.iov[1].iov_len = sizeof(state->smb1.hdr); + state->smb1.iov[2].iov_base = (void *)state->smb1.vwv; + state->smb1.iov[2].iov_len = wct * sizeof(uint16_t); + state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf; + state->smb1.iov[3].iov_len = sizeof(uint16_t); + + if (iov_count != 0) { + memcpy(&state->smb1.iov[4], bytes_iov, + iov_count * sizeof(*bytes_iov)); + } + state->smb1.iov_count = iov_count + 4; + + if (timeout_msec > 0) { + state->endtime = timeval_current_ofs_msec(timeout_msec); + if (!tevent_req_set_endtime(req, ev, state->endtime)) { + return req; + } + } + + switch (smb_command) { + case SMBtranss: + case SMBtranss2: + case SMBnttranss: + state->one_way = true; + break; + case SMBntcancel: + state->one_way = true; + state->smb1.one_way_seqnum = true; + break; + case SMBlockingX: + if ((wct == 8) && + (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) { + state->one_way = true; + } + break; + } + + return req; +} + +static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn, + struct iovec *iov, int iov_count, + uint32_t *seqnum, + bool one_way_seqnum) +{ + TALLOC_CTX *frame = NULL; + NTSTATUS status; + uint8_t *buf; + + /* + * Obvious optimization: Make cli_calculate_sign_mac work with struct + * iovec directly. MD5Update would do that just fine. + */ + + if (iov_count < 4) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + if (iov[0].iov_len != NBT_HDR_SIZE) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + if (iov[3].iov_len != sizeof(uint16_t)) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + frame = talloc_stackframe(); + + buf = iov_concat(frame, &iov[1], iov_count - 1); + if (buf == NULL) { + return NT_STATUS_NO_MEMORY; + } + + *seqnum = smb1_signing_next_seqnum(conn->smb1.signing, + one_way_seqnum); + status = smb1_signing_sign_pdu(conn->smb1.signing, + buf, + talloc_get_size(buf), + *seqnum); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + memcpy(iov[1].iov_base, buf, iov[1].iov_len); + + TALLOC_FREE(frame); + return NT_STATUS_OK; +} + +static void smb1cli_req_writev_done(struct tevent_req *subreq); +static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn, + TALLOC_CTX *tmp_mem, + uint8_t *inbuf); + +static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req, + struct smbXcli_req_state *state, + struct iovec *iov, int iov_count) +{ + struct tevent_req *subreq; + NTSTATUS status; + uint8_t cmd; + uint16_t mid; + ssize_t nbtlen; + + if (!smbXcli_conn_is_connected(state->conn)) { + return NT_STATUS_CONNECTION_DISCONNECTED; + } + + if (state->conn->protocol > PROTOCOL_NT1) { + DBG_ERR("called for dialect[%s] server[%s]\n", + smb_protocol_types_string(state->conn->protocol), + smbXcli_conn_remote_name(state->conn)); + return NT_STATUS_REVISION_MISMATCH; + } + + if (iov_count < 4) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + if (iov[0].iov_len != NBT_HDR_SIZE) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + if (iov[3].iov_len != sizeof(uint16_t)) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + cmd = CVAL(iov[1].iov_base, HDR_COM); + if (cmd == SMBreadBraw) { + if (smbXcli_conn_has_async_calls(state->conn)) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + state->conn->smb1.read_braw_req = req; + } + + if (state->smb1.mid != 0) { + mid = state->smb1.mid; + } else { + mid = smb1cli_alloc_mid(state->conn); + } + SSVAL(iov[1].iov_base, HDR_MID, mid); + + nbtlen = iov_buflen(&iov[1], iov_count-1); + if ((nbtlen == -1) || (nbtlen > 0x1FFFF)) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + _smb_setlen_nbt(iov[0].iov_base, nbtlen); + + status = smb1cli_conn_signv(state->conn, iov, iov_count, + &state->smb1.seqnum, + state->smb1.one_way_seqnum); + + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + /* + * If we supported multiple encryption contexts + * here we'd look up based on tid. + */ + if (common_encryption_on(state->conn->smb1.trans_enc)) { + char *buf, *enc_buf; + + buf = (char *)iov_concat(talloc_tos(), iov, iov_count); + if (buf == NULL) { + return NT_STATUS_NO_MEMORY; + } + status = common_encrypt_buffer(state->conn->smb1.trans_enc, + (char *)buf, &enc_buf); + TALLOC_FREE(buf); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0, ("Error in encrypting client message: %s\n", + nt_errstr(status))); + return status; + } + buf = (char *)talloc_memdup(state, enc_buf, + smb_len_nbt(enc_buf)+4); + SAFE_FREE(enc_buf); + if (buf == NULL) { + return NT_STATUS_NO_MEMORY; + } + iov[0].iov_base = (void *)buf; + iov[0].iov_len = talloc_get_size(buf); + iov_count = 1; + } + + if (state->conn->dispatch_incoming == NULL) { + state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming; + } + + if (!smbXcli_req_set_pending(req)) { + return NT_STATUS_NO_MEMORY; + } + + tevent_req_set_cancel_fn(req, smbXcli_req_cancel); + + subreq = writev_send(state, state->ev, state->conn->outgoing, + state->conn->sock_fd, false, iov, iov_count); + if (subreq == NULL) { + return NT_STATUS_NO_MEMORY; + } + tevent_req_set_callback(subreq, smb1cli_req_writev_done, req); + state->write_req = subreq; + + return NT_STATUS_OK; +} + +struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbXcli_conn *conn, + uint8_t smb_command, + uint8_t additional_flags, + uint8_t clear_flags, + uint16_t additional_flags2, + uint16_t clear_flags2, + uint32_t timeout_msec, + uint32_t pid, + struct smbXcli_tcon *tcon, + struct smbXcli_session *session, + uint8_t wct, uint16_t *vwv, + uint32_t num_bytes, + const uint8_t *bytes) +{ + struct tevent_req *req; + struct iovec iov; + NTSTATUS status; + + iov.iov_base = discard_const_p(void, bytes); + iov.iov_len = num_bytes; + + req = smb1cli_req_create(mem_ctx, ev, conn, smb_command, + additional_flags, clear_flags, + additional_flags2, clear_flags2, + timeout_msec, + pid, tcon, session, + wct, vwv, 1, &iov); + if (req == NULL) { + return NULL; + } + if (!tevent_req_is_in_progress(req)) { + return tevent_req_post(req, ev); + } + status = smb1cli_req_chain_submit(&req, 1); + if (tevent_req_nterror(req, status)) { + return tevent_req_post(req, ev); + } + return req; +} + +static void smb1cli_req_writev_done(struct tevent_req *subreq) +{ + struct tevent_req *req = + tevent_req_callback_data(subreq, + struct tevent_req); + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + ssize_t nwritten; + int err; + + state->write_req = NULL; + + nwritten = writev_recv(subreq, &err); + TALLOC_FREE(subreq); + if (nwritten == -1) { + /* here, we need to notify all pending requests */ + NTSTATUS status = map_nt_error_from_unix_common(err); + smbXcli_conn_disconnect(state->conn, status); + return; + } + + if (state->one_way) { + state->inbuf = NULL; + tevent_req_done(req); + return; + } +} + +static void smbXcli_conn_received(struct tevent_req *subreq) +{ + struct smbXcli_conn *conn = + tevent_req_callback_data(subreq, + struct smbXcli_conn); + TALLOC_CTX *frame = talloc_stackframe(); + NTSTATUS status; + uint8_t *inbuf; + ssize_t received; + int err; + + if (subreq != conn->read_smb_req) { + DEBUG(1, ("Internal error: cli_smb_received called with " + "unexpected subreq\n")); + smbXcli_conn_disconnect(conn, NT_STATUS_INTERNAL_ERROR); + TALLOC_FREE(frame); + return; + } + conn->read_smb_req = NULL; + + received = read_smb_recv(subreq, frame, &inbuf, &err); + TALLOC_FREE(subreq); + if (received == -1) { + status = map_nt_error_from_unix_common(err); + smbXcli_conn_disconnect(conn, status); + TALLOC_FREE(frame); + return; + } + + status = conn->dispatch_incoming(conn, frame, inbuf); + TALLOC_FREE(frame); + if (NT_STATUS_IS_OK(status)) { + /* + * We should not do any more processing + * as the dispatch function called + * tevent_req_done(). + */ + return; + } + + if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) { + /* + * We got an error, so notify all pending requests + */ + smbXcli_conn_disconnect(conn, status); + return; + } + + /* + * We got NT_STATUS_RETRY, so we may ask for a + * next incoming pdu. + */ + if (!smbXcli_conn_receive_next(conn)) { + smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY); + } +} + +static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx, + struct iovec **piov, int *pnum_iov) +{ + struct iovec *iov; + size_t num_iov; + size_t buflen; + size_t taken; + size_t remaining; + uint8_t *hdr; + uint8_t cmd; + uint32_t wct_ofs; + NTSTATUS status; + size_t min_size = MIN_SMB_SIZE; + + buflen = smb_len_tcp(buf); + taken = 0; + + hdr = buf + NBT_HDR_SIZE; + + status = smb1cli_pull_raw_error(hdr); + if (NT_STATUS_IS_ERR(status)) { + /* + * This is an ugly hack to support OS/2 + * which skips the byte_count in the DATA block + * on some error responses. + * + * See bug #9096 + */ + min_size -= sizeof(uint16_t); + } + + if (buflen < min_size) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + /* + * This returns iovec elements in the following order: + * + * - SMB header + * + * - Parameter Block + * - Data Block + * + * - Parameter Block + * - Data Block + * + * - Parameter Block + * - Data Block + */ + num_iov = 1; + + iov = talloc_array(mem_ctx, struct iovec, num_iov); + if (iov == NULL) { + return NT_STATUS_NO_MEMORY; + } + iov[0].iov_base = hdr; + iov[0].iov_len = HDR_WCT; + taken += HDR_WCT; + + cmd = CVAL(hdr, HDR_COM); + wct_ofs = HDR_WCT; + + while (true) { + size_t len = buflen - taken; + struct iovec *cur; + struct iovec *iov_tmp; + uint8_t wct; + uint32_t bcc_ofs; + uint16_t bcc; + size_t needed; + + /* + * we need at least WCT + */ + needed = sizeof(uint8_t); + if (len < needed) { + DEBUG(10, ("%s: %d bytes left, expected at least %d\n", + __location__, (int)len, (int)needed)); + goto inval; + } + + /* + * Now we check if the specified words are there + */ + wct = CVAL(hdr, wct_ofs); + needed += wct * sizeof(uint16_t); + if (len < needed) { + DEBUG(10, ("%s: %d bytes left, expected at least %d\n", + __location__, (int)len, (int)needed)); + goto inval; + } + + if ((num_iov == 1) && + (len == needed) && + NT_STATUS_IS_ERR(status)) + { + /* + * This is an ugly hack to support OS/2 + * which skips the byte_count in the DATA block + * on some error responses. + * + * See bug #9096 + */ + iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec, + num_iov + 2); + if (iov_tmp == NULL) { + TALLOC_FREE(iov); + return NT_STATUS_NO_MEMORY; + } + iov = iov_tmp; + cur = &iov[num_iov]; + num_iov += 2; + + cur[0].iov_len = 0; + cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t)); + cur[1].iov_len = 0; + cur[1].iov_base = cur[0].iov_base; + + taken += needed; + break; + } + + /* + * we need at least BCC + */ + needed += sizeof(uint16_t); + if (len < needed) { + DEBUG(10, ("%s: %d bytes left, expected at least %d\n", + __location__, (int)len, (int)needed)); + goto inval; + } + + /* + * Now we check if the specified bytes are there + */ + bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t); + bcc = SVAL(hdr, bcc_ofs); + needed += bcc * sizeof(uint8_t); + if (len < needed) { + DEBUG(10, ("%s: %d bytes left, expected at least %d\n", + __location__, (int)len, (int)needed)); + goto inval; + } + + /* + * we allocate 2 iovec structures for words and bytes + */ + iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec, + num_iov + 2); + if (iov_tmp == NULL) { + TALLOC_FREE(iov); + return NT_STATUS_NO_MEMORY; + } + iov = iov_tmp; + cur = &iov[num_iov]; + num_iov += 2; + + cur[0].iov_len = wct * sizeof(uint16_t); + cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t)); + cur[1].iov_len = bcc * sizeof(uint8_t); + cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t)); + + taken += needed; + + if (!smb1cli_is_andx_req(cmd)) { + /* + * If the current command does not have AndX chanining + * we are done. + */ + break; + } + + if (wct == 0 && bcc == 0) { + /* + * An empty response also ends the chain, + * most likely with an error. + */ + break; + } + + if (wct < 2) { + DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n", + __location__, (int)wct, (int)cmd)); + goto inval; + } + cmd = CVAL(cur[0].iov_base, 0); + if (cmd == 0xFF) { + /* + * If it is the end of the chain we are also done. + */ + break; + } + wct_ofs = SVAL(cur[0].iov_base, 2); + + if (wct_ofs < taken) { + goto inval; + } + if (wct_ofs > buflen) { + goto inval; + } + + /* + * we consumed everything up to the start of the next + * parameter block. + */ + taken = wct_ofs; + } + + remaining = buflen - taken; + + if (remaining > 0 && num_iov >= 3) { + /* + * The last DATA block gets the remaining + * bytes, this is needed to support + * CAP_LARGE_WRITEX and CAP_LARGE_READX. + */ + iov[num_iov-1].iov_len += remaining; + } + + *piov = iov; + *pnum_iov = num_iov; + return NT_STATUS_OK; + +inval: + TALLOC_FREE(iov); + return NT_STATUS_INVALID_NETWORK_RESPONSE; +} + +static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn, + TALLOC_CTX *tmp_mem, + uint8_t *inbuf) +{ + struct tevent_req *req; + struct smbXcli_req_state *state; + NTSTATUS status; + size_t num_pending; + size_t i; + uint8_t cmd; + uint16_t mid; + bool oplock_break; + uint8_t *inhdr = inbuf + NBT_HDR_SIZE; + size_t len = smb_len_tcp(inbuf); + struct iovec *iov = NULL; + int num_iov = 0; + struct tevent_req **chain = NULL; + size_t num_chained = 0; + size_t num_responses = 0; + + if (conn->smb1.read_braw_req != NULL) { + req = conn->smb1.read_braw_req; + conn->smb1.read_braw_req = NULL; + state = tevent_req_data(req, struct smbXcli_req_state); + + smbXcli_req_unset_pending(req); + + if (state->smb1.recv_iov == NULL) { + /* + * For requests with more than + * one response, we have to readd the + * recv_iov array. + */ + state->smb1.recv_iov = talloc_zero_array(state, + struct iovec, + 3); + if (tevent_req_nomem(state->smb1.recv_iov, req)) { + return NT_STATUS_OK; + } + } + + state->smb1.recv_iov[0].iov_base = (void *)(inhdr); + state->smb1.recv_iov[0].iov_len = len; + ZERO_STRUCT(state->smb1.recv_iov[1]); + ZERO_STRUCT(state->smb1.recv_iov[2]); + + state->smb1.recv_cmd = SMBreadBraw; + state->smb1.recv_status = NT_STATUS_OK; + state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf); + + tevent_req_done(req); + return NT_STATUS_OK; + } + + if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */ + && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ { + DEBUG(10, ("Got non-SMB PDU\n")); + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + /* + * If we supported multiple encryption contexts + * here we'd look up based on tid. + */ + if (common_encryption_on(conn->smb1.trans_enc) + && (CVAL(inbuf, 0) == 0)) { + uint16_t enc_ctx_num; + + status = get_enc_ctx_num(inbuf, &enc_ctx_num); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(10, ("get_enc_ctx_num returned %s\n", + nt_errstr(status))); + return status; + } + + if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) { + DEBUG(10, ("wrong enc_ctx %d, expected %d\n", + enc_ctx_num, + conn->smb1.trans_enc->enc_ctx_num)); + return NT_STATUS_INVALID_HANDLE; + } + + status = common_decrypt_buffer(conn->smb1.trans_enc, + (char *)inbuf); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(10, ("common_decrypt_buffer returned %s\n", + nt_errstr(status))); + return status; + } + inhdr = inbuf + NBT_HDR_SIZE; + len = smb_len_nbt(inbuf); + } + + mid = SVAL(inhdr, HDR_MID); + num_pending = talloc_array_length(conn->pending); + + for (i=0; i<num_pending; i++) { + if (mid == smb1cli_req_mid(conn->pending[i])) { + break; + } + } + if (i == num_pending) { + /* Dump unexpected reply */ + return NT_STATUS_RETRY; + } + + oplock_break = false; + + if (mid == 0xffff) { + /* + * Paranoia checks that this is really an oplock break request. + */ + oplock_break = (len == 51); /* hdr + 8 words */ + oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0); + oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX); + oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0); + oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0); + + if (!oplock_break) { + /* Dump unexpected reply */ + return NT_STATUS_RETRY; + } + } + + req = conn->pending[i]; + state = tevent_req_data(req, struct smbXcli_req_state); + + if (!oplock_break /* oplock breaks are not signed */ + && !smb1_signing_check_pdu(conn->smb1.signing, + inhdr, len, state->smb1.seqnum+1)) { + DEBUG(10, ("cli_check_sign_mac failed\n")); + return NT_STATUS_ACCESS_DENIED; + } + + status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem, + &iov, &num_iov); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n", + nt_errstr(status))); + return status; + } + + cmd = CVAL(inhdr, HDR_COM); + status = smb1cli_pull_raw_error(inhdr); + + if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) && + (state->session != NULL) && state->session->disconnect_expired) + { + /* + * this should be a short term hack + * until the upper layers have implemented + * re-authentication. + */ + return status; + } + + if (state->smb1.chained_requests == NULL) { + if (num_iov != 3) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + smbXcli_req_unset_pending(req); + + if (state->smb1.recv_iov == NULL) { + /* + * For requests with more than + * one response, we have to readd the + * recv_iov array. + */ + state->smb1.recv_iov = talloc_zero_array(state, + struct iovec, + 3); + if (tevent_req_nomem(state->smb1.recv_iov, req)) { + return NT_STATUS_OK; + } + } + + state->smb1.recv_cmd = cmd; + state->smb1.recv_status = status; + state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf); + + state->smb1.recv_iov[0] = iov[0]; + state->smb1.recv_iov[1] = iov[1]; + state->smb1.recv_iov[2] = iov[2]; + + if (talloc_array_length(conn->pending) == 0) { + tevent_req_done(req); + return NT_STATUS_OK; + } + + tevent_req_defer_callback(req, state->ev); + tevent_req_done(req); + return NT_STATUS_RETRY; + } + + chain = talloc_move(tmp_mem, &state->smb1.chained_requests); + num_chained = talloc_array_length(chain); + num_responses = (num_iov - 1)/2; + + if (num_responses > num_chained) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + for (i=0; i<num_chained; i++) { + size_t iov_idx = 1 + (i*2); + struct iovec *cur = &iov[iov_idx]; + uint8_t *inbuf_ref; + + req = chain[i]; + state = tevent_req_data(req, struct smbXcli_req_state); + + smbXcli_req_unset_pending(req); + + /* + * as we finish multiple requests here + * we need to defer the callbacks as + * they could destroy our current stack state. + */ + tevent_req_defer_callback(req, state->ev); + + if (i >= num_responses) { + tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED); + continue; + } + + if (state->smb1.recv_iov == NULL) { + /* + * For requests with more than + * one response, we have to readd the + * recv_iov array. + */ + state->smb1.recv_iov = talloc_zero_array(state, + struct iovec, + 3); + if (tevent_req_nomem(state->smb1.recv_iov, req)) { + continue; + } + } + + state->smb1.recv_cmd = cmd; + + if (i == (num_responses - 1)) { + /* + * The last request in the chain gets the status + */ + state->smb1.recv_status = status; + } else { + cmd = CVAL(cur[0].iov_base, 0); + state->smb1.recv_status = NT_STATUS_OK; + } + + state->inbuf = inbuf; + + /* + * Note: here we use talloc_reference() in a way + * that does not expose it to the caller. + */ + inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf); + if (tevent_req_nomem(inbuf_ref, req)) { + continue; + } + + /* copy the related buffers */ + state->smb1.recv_iov[0] = iov[0]; + state->smb1.recv_iov[1] = cur[0]; + state->smb1.recv_iov[2] = cur[1]; + + tevent_req_done(req); + } + + return NT_STATUS_RETRY; +} + +NTSTATUS smb1cli_req_recv(struct tevent_req *req, + TALLOC_CTX *mem_ctx, + struct iovec **piov, + uint8_t **phdr, + uint8_t *pwct, + uint16_t **pvwv, + uint32_t *pvwv_offset, + uint32_t *pnum_bytes, + uint8_t **pbytes, + uint32_t *pbytes_offset, + uint8_t **pinbuf, + const struct smb1cli_req_expected_response *expected, + size_t num_expected) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + NTSTATUS status = NT_STATUS_OK; + struct iovec *recv_iov = NULL; + uint8_t *hdr = NULL; + uint8_t wct = 0; + uint32_t vwv_offset = 0; + uint16_t *vwv = NULL; + uint32_t num_bytes = 0; + uint32_t bytes_offset = 0; + uint8_t *bytes = NULL; + size_t i; + bool found_status = false; + bool found_size = false; + + if (piov != NULL) { + *piov = NULL; + } + if (phdr != NULL) { + *phdr = 0; + } + if (pwct != NULL) { + *pwct = 0; + } + if (pvwv != NULL) { + *pvwv = NULL; + } + if (pvwv_offset != NULL) { + *pvwv_offset = 0; + } + if (pnum_bytes != NULL) { + *pnum_bytes = 0; + } + if (pbytes != NULL) { + *pbytes = NULL; + } + if (pbytes_offset != NULL) { + *pbytes_offset = 0; + } + if (pinbuf != NULL) { + *pinbuf = NULL; + } + + if (state->inbuf != NULL) { + recv_iov = state->smb1.recv_iov; + state->smb1.recv_iov = NULL; + if (state->smb1.recv_cmd != SMBreadBraw) { + hdr = (uint8_t *)recv_iov[0].iov_base; + wct = recv_iov[1].iov_len/2; + vwv = (uint16_t *)recv_iov[1].iov_base; + vwv_offset = PTR_DIFF(vwv, hdr); + num_bytes = recv_iov[2].iov_len; + bytes = (uint8_t *)recv_iov[2].iov_base; + bytes_offset = PTR_DIFF(bytes, hdr); + } + } + + if (tevent_req_is_nterror(req, &status)) { + for (i=0; i < num_expected; i++) { + if (NT_STATUS_EQUAL(status, expected[i].status)) { + found_status = true; + break; + } + } + + if (found_status) { + return NT_STATUS_UNEXPECTED_NETWORK_ERROR; + } + + return status; + } + + if (num_expected == 0) { + found_status = true; + found_size = true; + } + + status = state->smb1.recv_status; + + for (i=0; i < num_expected; i++) { + if (!NT_STATUS_EQUAL(status, expected[i].status)) { + continue; + } + + found_status = true; + if (expected[i].wct == 0) { + found_size = true; + break; + } + + if (expected[i].wct == wct) { + found_size = true; + break; + } + } + + if (!found_status) { + return status; + } + + if (!found_size) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + if (piov != NULL) { + *piov = talloc_move(mem_ctx, &recv_iov); + } + + if (phdr != NULL) { + *phdr = hdr; + } + if (pwct != NULL) { + *pwct = wct; + } + if (pvwv != NULL) { + *pvwv = vwv; + } + if (pvwv_offset != NULL) { + *pvwv_offset = vwv_offset; + } + if (pnum_bytes != NULL) { + *pnum_bytes = num_bytes; + } + if (pbytes != NULL) { + *pbytes = bytes; + } + if (pbytes_offset != NULL) { + *pbytes_offset = bytes_offset; + } + if (pinbuf != NULL) { + *pinbuf = state->inbuf; + } + + return status; +} + +size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs) +{ + size_t wct_ofs; + int i; + + wct_ofs = HDR_WCT; + + for (i=0; i<num_reqs; i++) { + struct smbXcli_req_state *state; + state = tevent_req_data(reqs[i], struct smbXcli_req_state); + wct_ofs += smbXcli_iov_len(state->smb1.iov+2, + state->smb1.iov_count-2); + wct_ofs = (wct_ofs + 3) & ~3; + } + return wct_ofs; +} + +NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs) +{ + struct smbXcli_req_state *first_state = + tevent_req_data(reqs[0], + struct smbXcli_req_state); + struct smbXcli_req_state *state; + size_t wct_offset; + size_t chain_padding = 0; + int i, iovlen; + struct iovec *iov = NULL; + struct iovec *this_iov; + NTSTATUS status; + ssize_t nbt_len; + + if (num_reqs == 1) { + return smb1cli_req_writev_submit(reqs[0], first_state, + first_state->smb1.iov, + first_state->smb1.iov_count); + } + + iovlen = 0; + for (i=0; i<num_reqs; i++) { + if (!tevent_req_is_in_progress(reqs[i])) { + return NT_STATUS_INTERNAL_ERROR; + } + + state = tevent_req_data(reqs[i], struct smbXcli_req_state); + + if (state->smb1.iov_count < 4) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (i == 0) { + /* + * The NBT and SMB header + */ + iovlen += 2; + } else { + /* + * Chain padding + */ + iovlen += 1; + } + + /* + * words and bytes + */ + iovlen += state->smb1.iov_count - 2; + } + + iov = talloc_zero_array(first_state, struct iovec, iovlen); + if (iov == NULL) { + return NT_STATUS_NO_MEMORY; + } + + first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup( + first_state, reqs, sizeof(*reqs) * num_reqs); + if (first_state->smb1.chained_requests == NULL) { + TALLOC_FREE(iov); + return NT_STATUS_NO_MEMORY; + } + + wct_offset = HDR_WCT; + this_iov = iov; + + for (i=0; i<num_reqs; i++) { + size_t next_padding = 0; + uint16_t *vwv; + + state = tevent_req_data(reqs[i], struct smbXcli_req_state); + + if (i < num_reqs-1) { + if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM)) + || CVAL(state->smb1.hdr, HDR_WCT) < 2) { + TALLOC_FREE(iov); + TALLOC_FREE(first_state->smb1.chained_requests); + return NT_STATUS_INVALID_PARAMETER_MIX; + } + } + + wct_offset += smbXcli_iov_len(state->smb1.iov+2, + state->smb1.iov_count-2) + 1; + if ((wct_offset % 4) != 0) { + next_padding = 4 - (wct_offset % 4); + } + wct_offset += next_padding; + vwv = state->smb1.vwv; + + if (i < num_reqs-1) { + struct smbXcli_req_state *next_state = + tevent_req_data(reqs[i+1], + struct smbXcli_req_state); + SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM)); + SCVAL(vwv+0, 1, 0); + SSVAL(vwv+1, 0, wct_offset); + } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) { + /* properly end the chain */ + SCVAL(vwv+0, 0, 0xff); + SCVAL(vwv+0, 1, 0xff); + SSVAL(vwv+1, 0, 0); + } + + if (i == 0) { + /* + * The NBT and SMB header + */ + this_iov[0] = state->smb1.iov[0]; + this_iov[1] = state->smb1.iov[1]; + this_iov += 2; + } else { + /* + * This one is a bit subtle. We have to add + * chain_padding bytes between the requests, and we + * have to also include the wct field of the + * subsequent requests. We use the subsequent header + * for the padding, it contains the wct field in its + * last byte. + */ + this_iov[0].iov_len = chain_padding+1; + this_iov[0].iov_base = (void *)&state->smb1.hdr[ + sizeof(state->smb1.hdr) - this_iov[0].iov_len]; + memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1); + this_iov += 1; + } + + /* + * copy the words and bytes + */ + memcpy(this_iov, state->smb1.iov+2, + sizeof(struct iovec) * (state->smb1.iov_count-2)); + this_iov += state->smb1.iov_count - 2; + chain_padding = next_padding; + } + + nbt_len = iov_buflen(&iov[1], iovlen-1); + if ((nbt_len == -1) || (nbt_len > first_state->conn->smb1.max_xmit)) { + TALLOC_FREE(iov); + TALLOC_FREE(first_state->smb1.chained_requests); + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen); + if (!NT_STATUS_IS_OK(status)) { + TALLOC_FREE(iov); + TALLOC_FREE(first_state->smb1.chained_requests); + return status; + } + + return NT_STATUS_OK; +} + +struct tevent_queue *smbXcli_conn_send_queue(struct smbXcli_conn *conn) +{ + return conn->outgoing; +} + +bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn) +{ + return ((tevent_queue_length(conn->outgoing) != 0) + || (talloc_array_length(conn->pending) != 0)); +} + +bool smbXcli_conn_dfs_supported(struct smbXcli_conn *conn) +{ + if (conn->protocol >= PROTOCOL_SMB2_02) { + return (smb2cli_conn_server_capabilities(conn) & SMB2_CAP_DFS); + } + + return (smb1cli_conn_capabilities(conn) & CAP_DFS); +} + +bool smb2cli_conn_req_possible(struct smbXcli_conn *conn, uint32_t *max_dyn_len) +{ + uint16_t credits = 1; + + if (conn->smb2.cur_credits == 0) { + if (max_dyn_len != NULL) { + *max_dyn_len = 0; + } + return false; + } + + if (conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) { + credits = conn->smb2.cur_credits; + } + + if (max_dyn_len != NULL) { + *max_dyn_len = credits * 65536; + } + + return true; +} + +uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn) +{ + return conn->smb2.server.capabilities; +} + +uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn) +{ + return conn->smb2.server.security_mode; +} + +uint16_t smb2cli_conn_server_signing_algo(struct smbXcli_conn *conn) +{ + return conn->smb2.server.sign_algo; +} + +uint16_t smb2cli_conn_server_encryption_algo(struct smbXcli_conn *conn) +{ + return conn->smb2.server.cipher; +} + +uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn) +{ + return conn->smb2.server.max_trans_size; +} + +uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn) +{ + return conn->smb2.server.max_read_size; +} + +uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn) +{ + return conn->smb2.server.max_write_size; +} + +void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn, + uint16_t max_credits) +{ + conn->smb2.max_credits = max_credits; +} + +uint16_t smb2cli_conn_get_cur_credits(struct smbXcli_conn *conn) +{ + return conn->smb2.cur_credits; +} + +uint8_t smb2cli_conn_get_io_priority(struct smbXcli_conn *conn) +{ + if (conn->protocol < PROTOCOL_SMB3_11) { + return 0; + } + + return conn->smb2.io_priority; +} + +void smb2cli_conn_set_io_priority(struct smbXcli_conn *conn, + uint8_t io_priority) +{ + conn->smb2.io_priority = io_priority; +} + +uint32_t smb2cli_conn_cc_chunk_len(struct smbXcli_conn *conn) +{ + return conn->smb2.cc_chunk_len; +} + +void smb2cli_conn_set_cc_chunk_len(struct smbXcli_conn *conn, + uint32_t chunk_len) +{ + conn->smb2.cc_chunk_len = chunk_len; +} + +uint32_t smb2cli_conn_cc_max_chunks(struct smbXcli_conn *conn) +{ + return conn->smb2.cc_max_chunks; +} + +void smb2cli_conn_set_cc_max_chunks(struct smbXcli_conn *conn, + uint32_t max_chunks) +{ + conn->smb2.cc_max_chunks = max_chunks; +} + +static void smb2cli_req_cancel_done(struct tevent_req *subreq); + +static bool smb2cli_req_cancel(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + struct smbXcli_tcon *tcon = state->tcon; + struct smbXcli_session *session = state->session; + uint8_t *fixed = state->smb2.pad; + uint16_t fixed_len = 4; + struct tevent_req *subreq; + struct smbXcli_req_state *substate; + NTSTATUS status; + + if (state->smb2.cancel_mid == UINT64_MAX) { + /* + * We already send a cancel, + * make sure we don't do it + * twice, otherwise we may + * expose the same NONCE for + * AES-128-GMAC signing + */ + return true; + } + + SSVAL(fixed, 0, 0x04); + SSVAL(fixed, 2, 0); + + subreq = smb2cli_req_create(state, state->ev, + state->conn, + SMB2_OP_CANCEL, + 0, 0, /* flags */ + 0, /* timeout */ + tcon, session, + fixed, fixed_len, + NULL, 0, 0); + if (subreq == NULL) { + return false; + } + substate = tevent_req_data(subreq, struct smbXcli_req_state); + + substate->smb2.cancel_mid = BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID); + + SIVAL(substate->smb2.hdr, SMB2_HDR_FLAGS, state->smb2.cancel_flags); + SBVAL(substate->smb2.hdr, SMB2_HDR_MESSAGE_ID, state->smb2.cancel_mid); + SBVAL(substate->smb2.hdr, SMB2_HDR_ASYNC_ID, state->smb2.cancel_aid); + + /* + * remember that we don't send a cancel again + */ + state->smb2.cancel_mid = UINT64_MAX; + + status = smb2cli_req_compound_submit(&subreq, 1); + if (!NT_STATUS_IS_OK(status)) { + TALLOC_FREE(subreq); + return false; + } + + tevent_req_set_callback(subreq, smb2cli_req_cancel_done, NULL); + + return true; +} + +static void smb2cli_req_cancel_done(struct tevent_req *subreq) +{ + /* we do not care about the result */ + TALLOC_FREE(subreq); +} + +struct timeval smbXcli_req_endtime(struct tevent_req *req) +{ + struct smbXcli_req_state *state = tevent_req_data( + req, struct smbXcli_req_state); + + return state->endtime; +} + +struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbXcli_conn *conn, + uint16_t cmd, + uint32_t additional_flags, + uint32_t clear_flags, + uint32_t timeout_msec, + struct smbXcli_tcon *tcon, + struct smbXcli_session *session, + const uint8_t *fixed, + uint16_t fixed_len, + const uint8_t *dyn, + uint32_t dyn_len, + uint32_t max_dyn_len) +{ + struct tevent_req *req; + struct smbXcli_req_state *state; + uint32_t flags = 0; + uint32_t tid = 0; + uint64_t uid = 0; + bool use_channel_sequence = conn->smb2.force_channel_sequence; + uint16_t channel_sequence = 0; + bool use_replay_flag = false; + + req = tevent_req_create(mem_ctx, &state, + struct smbXcli_req_state); + if (req == NULL) { + return NULL; + } + + state->ev = ev; + state->conn = conn; + state->session = session; + state->tcon = tcon; + + if (conn->smb2.server.capabilities & SMB2_CAP_PERSISTENT_HANDLES) { + use_channel_sequence = true; + } else if (conn->smb2.server.capabilities & SMB2_CAP_MULTI_CHANNEL) { + use_channel_sequence = true; + } + + if (smbXcli_conn_protocol(conn) >= PROTOCOL_SMB3_00) { + use_replay_flag = true; + } + + if (smbXcli_conn_protocol(conn) >= PROTOCOL_SMB3_11) { + flags |= SMB2_PRIORITY_VALUE_TO_MASK(conn->smb2.io_priority); + } + + if (session) { + uid = session->smb2->session_id; + + if (use_channel_sequence) { + channel_sequence = session->smb2->channel_sequence; + } + + if (use_replay_flag && session->smb2->replay_active) { + additional_flags |= SMB2_HDR_FLAG_REPLAY_OPERATION; + } + + state->smb2.should_sign = session->smb2->should_sign; + state->smb2.should_encrypt = session->smb2->should_encrypt; + state->smb2.require_signed_response = + session->smb2->require_signed_response; + + if (cmd == SMB2_OP_SESSSETUP && + !smb2_signing_key_valid(session->smb2_channel.signing_key) && + smb2_signing_key_valid(session->smb2->signing_key)) + { + /* + * a session bind needs to be signed + */ + state->smb2.should_sign = true; + } + + if (cmd == SMB2_OP_SESSSETUP && + !smb2_signing_key_valid(session->smb2_channel.signing_key)) { + state->smb2.should_encrypt = false; + } + + if (additional_flags & SMB2_HDR_FLAG_SIGNED) { + if (!smb2_signing_key_valid(session->smb2_channel.signing_key)) { + tevent_req_nterror(req, NT_STATUS_NO_USER_SESSION_KEY); + return req; + } + + additional_flags &= ~SMB2_HDR_FLAG_SIGNED; + state->smb2.should_sign = true; + } + } + + if (tcon) { + tid = tcon->smb2.tcon_id; + + if (tcon->smb2.should_sign) { + state->smb2.should_sign = true; + } + if (tcon->smb2.should_encrypt) { + state->smb2.should_encrypt = true; + } + } + + if (state->smb2.should_encrypt) { + state->smb2.should_sign = false; + } + + state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3); + if (state->smb2.recv_iov == NULL) { + TALLOC_FREE(req); + return NULL; + } + + flags |= additional_flags; + flags &= ~clear_flags; + + state->smb2.fixed = fixed; + state->smb2.fixed_len = fixed_len; + state->smb2.dyn = dyn; + state->smb2.dyn_len = dyn_len; + state->smb2.max_dyn_len = max_dyn_len; + + if (state->smb2.should_encrypt) { + SIVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC); + SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID, uid); + } + + SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID, SMB2_MAGIC); + SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY); + SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE, cmd); + SSVAL(state->smb2.hdr, SMB2_HDR_CHANNEL_SEQUENCE, channel_sequence); + SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS, flags); + SIVAL(state->smb2.hdr, SMB2_HDR_PID, 0); /* reserved */ + SIVAL(state->smb2.hdr, SMB2_HDR_TID, tid); + SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID, uid); + + switch (cmd) { + case SMB2_OP_CANCEL: + state->one_way = true; + break; + case SMB2_OP_BREAK: + /* + * If this is a dummy request, it will have + * UINT64_MAX as message id. + * If we send on break acknowledgement, + * this gets overwritten later. + */ + SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX); + break; + } + + if (timeout_msec > 0) { + state->endtime = timeval_current_ofs_msec(timeout_msec); + if (!tevent_req_set_endtime(req, ev, state->endtime)) { + return req; + } + } + + return req; +} + +void smb2cli_req_set_notify_async(struct tevent_req *req) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + state->smb2.notify_async = true; +} + +static void smb2cli_req_writev_done(struct tevent_req *subreq); +static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn, + TALLOC_CTX *tmp_mem, + uint8_t *inbuf); + +NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs, + int num_reqs) +{ + struct smbXcli_req_state *state; + struct tevent_req *subreq; + struct iovec *iov; + int i, num_iov, nbt_len; + int tf_iov = -1; + struct smb2_signing_key *encryption_key = NULL; + uint64_t encryption_session_id = 0; + uint64_t nonce_high = UINT64_MAX; + uint64_t nonce_low = UINT64_MAX; + + /* + * 1 for the nbt length, optional TRANSFORM + * per request: HDR, fixed, dyn, padding + * -1 because the last one does not need padding + */ + + iov = talloc_array(reqs[0], struct iovec, 1 + 1 + 4*num_reqs - 1); + if (iov == NULL) { + return NT_STATUS_NO_MEMORY; + } + + num_iov = 1; + nbt_len = 0; + + /* + * the session of the first request that requires encryption + * specifies the encryption key. + */ + for (i=0; i<num_reqs; i++) { + if (!tevent_req_is_in_progress(reqs[i])) { + return NT_STATUS_INTERNAL_ERROR; + } + + state = tevent_req_data(reqs[i], struct smbXcli_req_state); + + if (!smbXcli_conn_is_connected(state->conn)) { + return NT_STATUS_CONNECTION_DISCONNECTED; + } + + if ((state->conn->protocol != PROTOCOL_NONE) && + (state->conn->protocol < PROTOCOL_SMB2_02)) { + return NT_STATUS_REVISION_MISMATCH; + } + + if (state->session == NULL) { + continue; + } + + if (!state->smb2.should_encrypt) { + continue; + } + + encryption_key = state->session->smb2->encryption_key; + if (!smb2_signing_key_valid(encryption_key)) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + encryption_session_id = state->session->smb2->session_id; + + state->session->smb2->nonce_low += 1; + if (state->session->smb2->nonce_low == 0) { + state->session->smb2->nonce_high += 1; + state->session->smb2->nonce_low += 1; + } + + /* + * CCM and GCM algorithms must never have their + * nonce wrap, or the security of the whole + * communication and the keys is destroyed. + * We must drop the connection once we have + * transfered too much data. + * + * NOTE: We assume nonces greater than 8 bytes. + */ + if (state->session->smb2->nonce_high >= + state->session->smb2->nonce_high_max) + { + return NT_STATUS_ENCRYPTION_FAILED; + } + + nonce_high = state->session->smb2->nonce_high_random; + nonce_high += state->session->smb2->nonce_high; + nonce_low = state->session->smb2->nonce_low; + + tf_iov = num_iov; + iov[num_iov].iov_base = state->smb2.transform; + iov[num_iov].iov_len = sizeof(state->smb2.transform); + num_iov += 1; + + SBVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC); + SBVAL(state->smb2.transform, SMB2_TF_NONCE, + nonce_low); + SBVAL(state->smb2.transform, SMB2_TF_NONCE+8, + nonce_high); + SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID, + encryption_session_id); + + nbt_len += SMB2_TF_HDR_SIZE; + break; + } + + for (i=0; i<num_reqs; i++) { + int hdr_iov; + size_t reqlen; + bool ret; + uint16_t opcode; + uint64_t avail; + uint16_t charge; + uint16_t credits; + uint64_t mid; + struct smb2_signing_key *signing_key = NULL; + + if (!tevent_req_is_in_progress(reqs[i])) { + return NT_STATUS_INTERNAL_ERROR; + } + + state = tevent_req_data(reqs[i], struct smbXcli_req_state); + + if (!smbXcli_conn_is_connected(state->conn)) { + return NT_STATUS_CONNECTION_DISCONNECTED; + } + + if ((state->conn->protocol != PROTOCOL_NONE) && + (state->conn->protocol < PROTOCOL_SMB2_02)) { + return NT_STATUS_REVISION_MISMATCH; + } + + opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE); + if (opcode == SMB2_OP_CANCEL) { + goto skip_credits; + } + + avail = UINT64_MAX - state->conn->smb2.mid; + if (avail < 1) { + return NT_STATUS_CONNECTION_ABORTED; + } + + if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) { + uint32_t max_dyn_len = 1; + + max_dyn_len = MAX(max_dyn_len, state->smb2.dyn_len); + max_dyn_len = MAX(max_dyn_len, state->smb2.max_dyn_len); + + charge = (max_dyn_len - 1)/ 65536 + 1; + } else { + charge = 1; + } + + charge = MAX(state->smb2.credit_charge, charge); + + avail = MIN(avail, state->conn->smb2.cur_credits); + if (avail < charge) { + DBG_ERR("Insufficient credits. " + "%"PRIu64" available, %"PRIu16" needed\n", + avail, charge); + return NT_STATUS_INTERNAL_ERROR; + } + + credits = 0; + if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) { + credits = state->conn->smb2.max_credits - + state->conn->smb2.cur_credits; + } + if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) { + credits += 1; + } + + mid = state->conn->smb2.mid; + state->conn->smb2.mid += charge; + state->conn->smb2.cur_credits -= charge; + + if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) { + SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge); + } + SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits); + SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid); + + state->smb2.cancel_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS); + state->smb2.cancel_flags &= ~SMB2_HDR_FLAG_CHAINED; + if (state->conn->smb2.server.sign_algo >= SMB2_SIGNING_AES128_GMAC) { + state->smb2.cancel_mid = mid; + } else { + state->smb2.cancel_mid = 0; + } + state->smb2.cancel_aid = 0; + +skip_credits: + if (state->session && encryption_key == NULL) { + /* + * We prefer the channel signing key if it is + * already there. + */ + if (state->smb2.should_sign) { + signing_key = state->session->smb2_channel.signing_key; + } + + /* + * If it is a channel binding, we already have the main + * signing key and try that one. + */ + if (signing_key != NULL && + !smb2_signing_key_valid(signing_key)) { + signing_key = state->session->smb2->signing_key; + } + + /* + * If we do not have any session key yet, we skip the + * signing of SMB2_OP_SESSSETUP requests. + */ + if (signing_key != NULL && + !smb2_signing_key_valid(signing_key)) { + signing_key = NULL; + } + } + + hdr_iov = num_iov; + iov[num_iov].iov_base = state->smb2.hdr; + iov[num_iov].iov_len = sizeof(state->smb2.hdr); + num_iov += 1; + + iov[num_iov].iov_base = discard_const(state->smb2.fixed); + iov[num_iov].iov_len = state->smb2.fixed_len; + num_iov += 1; + + if (state->smb2.dyn != NULL) { + iov[num_iov].iov_base = discard_const(state->smb2.dyn); + iov[num_iov].iov_len = state->smb2.dyn_len; + num_iov += 1; + } + + reqlen = sizeof(state->smb2.hdr); + reqlen += state->smb2.fixed_len; + reqlen += state->smb2.dyn_len; + + if (i < num_reqs-1) { + if ((reqlen % 8) > 0) { + uint8_t pad = 8 - (reqlen % 8); + iov[num_iov].iov_base = state->smb2.pad; + iov[num_iov].iov_len = pad; + num_iov += 1; + reqlen += pad; + } + SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen); + } + + state->smb2.encryption_session_id = encryption_session_id; + + if (signing_key != NULL) { + NTSTATUS status; + + status = smb2_signing_sign_pdu(signing_key, + &iov[hdr_iov], num_iov - hdr_iov); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + nbt_len += reqlen; + + ret = smbXcli_req_set_pending(reqs[i]); + if (!ret) { + return NT_STATUS_NO_MEMORY; + } + } + + state = tevent_req_data(reqs[0], struct smbXcli_req_state); + _smb_setlen_tcp(state->length_hdr, nbt_len); + iov[0].iov_base = state->length_hdr; + iov[0].iov_len = sizeof(state->length_hdr); + + if (encryption_key != NULL) { + NTSTATUS status; + size_t buflen = nbt_len - SMB2_TF_HDR_SIZE; + uint8_t *buf; + int vi; + + buf = talloc_array(iov, uint8_t, buflen); + if (buf == NULL) { + return NT_STATUS_NO_MEMORY; + } + + /* + * We copy the buffers before encrypting them, + * this is at least currently needed for the + * to keep state->smb2.hdr. + * + * Also the callers may expect there buffers + * to be const. + */ + for (vi = tf_iov + 1; vi < num_iov; vi++) { + struct iovec *v = &iov[vi]; + const uint8_t *o = (const uint8_t *)v->iov_base; + + memcpy(buf, o, v->iov_len); + v->iov_base = (void *)buf; + buf += v->iov_len; + } + + status = smb2_signing_encrypt_pdu(encryption_key, + &iov[tf_iov], num_iov - tf_iov); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + if (state->conn->dispatch_incoming == NULL) { + state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming; + } + + subreq = writev_send(state, state->ev, state->conn->outgoing, + state->conn->sock_fd, false, iov, num_iov); + if (subreq == NULL) { + return NT_STATUS_NO_MEMORY; + } + tevent_req_set_callback(subreq, smb2cli_req_writev_done, reqs[0]); + state->write_req = subreq; + + return NT_STATUS_OK; +} + +void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + state->smb2.credit_charge = charge; +} + +struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbXcli_conn *conn, + uint16_t cmd, + uint32_t additional_flags, + uint32_t clear_flags, + uint32_t timeout_msec, + struct smbXcli_tcon *tcon, + struct smbXcli_session *session, + const uint8_t *fixed, + uint16_t fixed_len, + const uint8_t *dyn, + uint32_t dyn_len, + uint32_t max_dyn_len) +{ + struct tevent_req *req; + NTSTATUS status; + + req = smb2cli_req_create(mem_ctx, ev, conn, cmd, + additional_flags, clear_flags, + timeout_msec, + tcon, session, + fixed, fixed_len, + dyn, dyn_len, + max_dyn_len); + if (req == NULL) { + return NULL; + } + if (!tevent_req_is_in_progress(req)) { + return tevent_req_post(req, ev); + } + status = smb2cli_req_compound_submit(&req, 1); + if (tevent_req_nterror(req, status)) { + return tevent_req_post(req, ev); + } + return req; +} + +static void smb2cli_req_writev_done(struct tevent_req *subreq) +{ + struct tevent_req *req = + tevent_req_callback_data(subreq, + struct tevent_req); + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + ssize_t nwritten; + int err; + + state->write_req = NULL; + + nwritten = writev_recv(subreq, &err); + TALLOC_FREE(subreq); + if (nwritten == -1) { + /* here, we need to notify all pending requests */ + NTSTATUS status = map_nt_error_from_unix_common(err); + smbXcli_conn_disconnect(state->conn, status); + return; + } +} + +static struct smbXcli_session* smbXcli_session_by_uid(struct smbXcli_conn *conn, + uint64_t uid) +{ + struct smbXcli_session *s = conn->sessions; + + for (; s; s = s->next) { + if (s->smb2->session_id != uid) { + continue; + } + break; + } + + return s; +} + +static NTSTATUS smb2cli_inbuf_parse_compound(struct smbXcli_conn *conn, + uint8_t *buf, + size_t buflen, + TALLOC_CTX *mem_ctx, + struct iovec **piov, + size_t *pnum_iov) +{ + struct iovec *iov; + int num_iov = 0; + size_t taken = 0; + uint8_t *first_hdr = buf; + size_t verified_buflen = 0; + uint8_t *tf = NULL; + size_t tf_len = 0; + + iov = talloc_array(mem_ctx, struct iovec, num_iov); + if (iov == NULL) { + return NT_STATUS_NO_MEMORY; + } + + while (taken < buflen) { + size_t len = buflen - taken; + uint8_t *hdr = first_hdr + taken; + struct iovec *cur; + size_t full_size; + size_t next_command_ofs; + uint16_t body_size; + struct iovec *iov_tmp; + + if (verified_buflen > taken) { + len = verified_buflen - taken; + } else { + tf = NULL; + tf_len = 0; + } + + if (len < 4) { + DEBUG(10, ("%d bytes left, expected at least %d\n", + (int)len, 4)); + goto inval; + } + if (IVAL(hdr, 0) == SMB2_TF_MAGIC) { + struct smbXcli_session *s; + uint64_t uid; + struct iovec tf_iov[2]; + size_t enc_len; + NTSTATUS status; + + if (len < SMB2_TF_HDR_SIZE) { + DEBUG(10, ("%d bytes left, expected at least %d\n", + (int)len, SMB2_TF_HDR_SIZE)); + goto inval; + } + tf = hdr; + tf_len = SMB2_TF_HDR_SIZE; + taken += tf_len; + + hdr = first_hdr + taken; + enc_len = IVAL(tf, SMB2_TF_MSG_SIZE); + uid = BVAL(tf, SMB2_TF_SESSION_ID); + + if (len < SMB2_TF_HDR_SIZE + enc_len) { + DEBUG(10, ("%d bytes left, expected at least %d\n", + (int)len, + (int)(SMB2_TF_HDR_SIZE + enc_len))); + goto inval; + } + + s = smbXcli_session_by_uid(conn, uid); + if (s == NULL) { + DEBUG(10, ("unknown session_id %llu\n", + (unsigned long long)uid)); + goto inval; + } + + tf_iov[0].iov_base = (void *)tf; + tf_iov[0].iov_len = tf_len; + tf_iov[1].iov_base = (void *)hdr; + tf_iov[1].iov_len = enc_len; + + status = smb2_signing_decrypt_pdu(s->smb2->decryption_key, + tf_iov, 2); + if (!NT_STATUS_IS_OK(status)) { + TALLOC_FREE(iov); + return status; + } + + verified_buflen = taken + enc_len; + len = enc_len; + } + + /* + * We need the header plus the body length field + */ + + if (len < SMB2_HDR_BODY + 2) { + DEBUG(10, ("%d bytes left, expected at least %d\n", + (int)len, SMB2_HDR_BODY)); + goto inval; + } + if (IVAL(hdr, 0) != SMB2_MAGIC) { + DEBUG(10, ("Got non-SMB2 PDU: %x\n", + IVAL(hdr, 0))); + goto inval; + } + if (SVAL(hdr, 4) != SMB2_HDR_BODY) { + DEBUG(10, ("Got HDR len %d, expected %d\n", + SVAL(hdr, 4), SMB2_HDR_BODY)); + goto inval; + } + + full_size = len; + next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND); + body_size = SVAL(hdr, SMB2_HDR_BODY); + + if (next_command_ofs != 0) { + if (next_command_ofs < (SMB2_HDR_BODY + 2)) { + goto inval; + } + if (next_command_ofs > full_size) { + goto inval; + } + full_size = next_command_ofs; + } + if (body_size < 2) { + goto inval; + } + body_size &= 0xfffe; + + if (body_size > (full_size - SMB2_HDR_BODY)) { + goto inval; + } + + iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec, + num_iov + 4); + if (iov_tmp == NULL) { + TALLOC_FREE(iov); + return NT_STATUS_NO_MEMORY; + } + iov = iov_tmp; + cur = &iov[num_iov]; + num_iov += 4; + + cur[0].iov_base = tf; + cur[0].iov_len = tf_len; + cur[1].iov_base = hdr; + cur[1].iov_len = SMB2_HDR_BODY; + cur[2].iov_base = hdr + SMB2_HDR_BODY; + cur[2].iov_len = body_size; + cur[3].iov_base = hdr + SMB2_HDR_BODY + body_size; + cur[3].iov_len = full_size - (SMB2_HDR_BODY + body_size); + + taken += full_size; + } + + *piov = iov; + *pnum_iov = num_iov; + return NT_STATUS_OK; + +inval: + TALLOC_FREE(iov); + return NT_STATUS_INVALID_NETWORK_RESPONSE; +} + +static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn, + uint64_t mid) +{ + size_t num_pending = talloc_array_length(conn->pending); + size_t i; + + for (i=0; i<num_pending; i++) { + struct tevent_req *req = conn->pending[i]; + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) { + return req; + } + } + return NULL; +} + +static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn, + TALLOC_CTX *tmp_mem, + uint8_t *inbuf) +{ + struct tevent_req *req; + struct smbXcli_req_state *state = NULL; + struct iovec *iov = NULL; + size_t i, num_iov = 0; + NTSTATUS status; + bool defer = true; + struct smbXcli_session *last_session = NULL; + size_t inbuf_len = smb_len_tcp(inbuf); + + status = smb2cli_inbuf_parse_compound(conn, + inbuf + NBT_HDR_SIZE, + inbuf_len, + tmp_mem, + &iov, &num_iov); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + for (i=0; i<num_iov; i+=4) { + uint8_t *inbuf_ref = NULL; + struct iovec *cur = &iov[i]; + uint8_t *inhdr = (uint8_t *)cur[1].iov_base; + uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE); + uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS); + uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID); + uint16_t req_opcode; + uint32_t req_flags; + uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT); + uint32_t new_credits; + struct smbXcli_session *session = NULL; + struct smb2_signing_key *signing_key = NULL; + bool was_encrypted = false; + + new_credits = conn->smb2.cur_credits; + new_credits += credits; + if (new_credits > UINT16_MAX) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + conn->smb2.cur_credits += credits; + + req = smb2cli_conn_find_pending(conn, mid); + if (req == NULL) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + state = tevent_req_data(req, struct smbXcli_req_state); + + req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE); + if (opcode != req_opcode) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS); + + if (!(flags & SMB2_HDR_FLAG_REDIRECT)) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS)); + if ((flags & SMB2_HDR_FLAG_ASYNC) && + NT_STATUS_EQUAL(status, NT_STATUS_PENDING)) { + uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID); + + if (state->smb2.got_async) { + /* We only expect one STATUS_PENDING response */ + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + state->smb2.got_async = true; + + /* + * async interim responses are not signed, + * even if the SMB2_HDR_FLAG_SIGNED flag + * is set. + */ + state->smb2.cancel_flags |= SMB2_HDR_FLAG_ASYNC; + state->smb2.cancel_aid = async_id; + + if (state->smb2.notify_async) { + tevent_req_defer_callback(req, state->ev); + tevent_req_notify_callback(req); + } + continue; + } + + session = state->session; + if (req_flags & SMB2_HDR_FLAG_CHAINED) { + session = last_session; + } + last_session = session; + + if (flags & SMB2_HDR_FLAG_SIGNED) { + uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID); + + if (session == NULL) { + session = smbXcli_session_by_uid(state->conn, + uid); + } + + if (session == NULL) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + last_session = session; + signing_key = session->smb2_channel.signing_key; + } + + if (opcode == SMB2_OP_SESSSETUP) { + /* + * We prefer the channel signing key, if it is + * already there. + * + * If we do not have a channel signing key yet, + * we try the main signing key, if it is not + * the final response. + */ + if (signing_key != NULL && + !smb2_signing_key_valid(signing_key) && + !NT_STATUS_IS_OK(status)) { + signing_key = session->smb2->signing_key; + } + + if (signing_key != NULL && + !smb2_signing_key_valid(signing_key)) { + /* + * If we do not have a session key to + * verify the signature, we defer the + * signing check to the caller. + * + * The caller gets NT_STATUS_OK, it + * has to call + * smb2cli_session_set_session_key() + * or + * smb2cli_session_set_channel_key() + * which will check the signature + * with the channel signing key. + */ + signing_key = NULL; + } + + if (!NT_STATUS_IS_OK(status)) { + /* + * Only check the signature of the last response + * of a successfull session auth. This matches + * Windows behaviour for NTLM auth and reauth. + */ + state->smb2.require_signed_response = false; + } + } + + if (state->smb2.should_sign || + state->smb2.require_signed_response) + { + if (!(flags & SMB2_HDR_FLAG_SIGNED)) { + return NT_STATUS_ACCESS_DENIED; + } + } + + if (!smb2_signing_key_valid(signing_key) && + state->smb2.require_signed_response) { + signing_key = session->smb2_channel.signing_key; + } + + if (cur[0].iov_len == SMB2_TF_HDR_SIZE) { + const uint8_t *tf = (const uint8_t *)cur[0].iov_base; + uint64_t uid = BVAL(tf, SMB2_TF_SESSION_ID); + + /* + * If the response was encrypted in a SMB2_TRANSFORM + * pdu, which belongs to the correct session, + * we do not need to do signing checks + * + * It could be the session the response belongs to + * or the session that was used to encrypt the + * SMB2_TRANSFORM request. + */ + if ((session && session->smb2->session_id == uid) || + (state->smb2.encryption_session_id == uid)) { + signing_key = NULL; + was_encrypted = true; + } + } + + if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) { + /* + * if the server returns NT_STATUS_USER_SESSION_DELETED + * the response is not signed and we should + * propagate the NT_STATUS_USER_SESSION_DELETED + * status to the caller. + */ + state->smb2.signing_skipped = true; + signing_key = NULL; + } + if (NT_STATUS_EQUAL(status, NT_STATUS_REQUEST_OUT_OF_SEQUENCE)) { + /* + * if the server returns + * NT_STATUS_REQUEST_OUT_OF_SEQUENCE for a session setup + * request, the response is not signed and we should + * propagate the NT_STATUS_REQUEST_OUT_OF_SEQUENCE + * status to the caller + */ + if (opcode == SMB2_OP_SESSSETUP) { + state->smb2.signing_skipped = true; + signing_key = NULL; + } + } + if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) { + /* + * if the server returns NT_STATUS_NOT_SUPPORTED + * for a session setup request, the response is not + * signed and we should propagate the NT_STATUS_NOT_SUPPORTED + * status to the caller. + */ + if (opcode == SMB2_OP_SESSSETUP) { + state->smb2.signing_skipped = true; + signing_key = NULL; + } + } + if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) { + /* + * if the server returns + * NT_STATUS_ACCESS_DENIED for a session setup + * request, the response is not signed and we should + * propagate the NT_STATUS_ACCESS_DENIED + * status to the caller without disconnecting + * the connection because we where not able to + * verify the response signature. + */ + if (opcode == SMB2_OP_SESSSETUP) { + state->smb2.signing_skipped = true; + signing_key = NULL; + } + } + + if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) { + /* + * if the server returns + * NT_STATUS_INVALID_PARAMETER + * the response might not be encrypted. + */ + if (state->smb2.should_encrypt && !was_encrypted) { + state->smb2.signing_skipped = true; + signing_key = NULL; + } + } + + if (state->smb2.should_encrypt && !was_encrypted) { + if (!state->smb2.signing_skipped) { + return NT_STATUS_ACCESS_DENIED; + } + } + + if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) || + NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) || + NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) { + /* + * if the server returns + * NT_STATUS_NETWORK_NAME_DELETED + * NT_STATUS_FILE_CLOSED + * NT_STATUS_INVALID_PARAMETER + * the response might not be signed + * as this happens before the signing checks. + * + * If server echos the signature (or all zeros) + * we should report the status from the server + * to the caller. + */ + if (signing_key) { + bool cmp; + + cmp = mem_equal_const_time(inhdr+SMB2_HDR_SIGNATURE, + state->smb2.hdr+SMB2_HDR_SIGNATURE, + 16); + if (cmp) { + state->smb2.signing_skipped = true; + signing_key = NULL; + } + } + if (signing_key) { + bool zero; + zero = all_zero(inhdr+SMB2_HDR_SIGNATURE, 16); + if (zero) { + state->smb2.signing_skipped = true; + signing_key = NULL; + } + } + } + + if (signing_key) { + NTSTATUS signing_status; + + signing_status = smb2_signing_check_pdu(signing_key, + &cur[1], 3); + if (!NT_STATUS_IS_OK(signing_status)) { + /* + * If the signing check fails, we disconnect + * the connection. + */ + return signing_status; + } + } + + if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) && + (session != NULL) && session->disconnect_expired) + { + /* + * this should be a short term hack + * until the upper layers have implemented + * re-authentication. + */ + return status; + } + + smbXcli_req_unset_pending(req); + + /* + * There might be more than one response + * we need to defer the notifications + */ + if ((num_iov == 5) && (talloc_array_length(conn->pending) == 0)) { + defer = false; + } + + if (defer) { + tevent_req_defer_callback(req, state->ev); + } + + /* + * Note: here we use talloc_reference() in a way + * that does not expose it to the caller. + */ + inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf); + if (tevent_req_nomem(inbuf_ref, req)) { + continue; + } + + /* copy the related buffers */ + state->smb2.recv_iov[0] = cur[1]; + state->smb2.recv_iov[1] = cur[2]; + state->smb2.recv_iov[2] = cur[3]; + + tevent_req_done(req); + } + + if (defer) { + return NT_STATUS_RETRY; + } + + return NT_STATUS_OK; +} + +NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, + struct iovec **piov, + const struct smb2cli_req_expected_response *expected, + size_t num_expected) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + NTSTATUS status; + size_t body_size; + bool found_status = false; + bool found_size = false; + size_t i; + + if (piov != NULL) { + *piov = NULL; + } + + if (tevent_req_is_in_progress(req) && state->smb2.got_async) { + return NT_STATUS_PENDING; + } + + if (tevent_req_is_nterror(req, &status)) { + for (i=0; i < num_expected; i++) { + if (NT_STATUS_EQUAL(status, expected[i].status)) { + return NT_STATUS_UNEXPECTED_NETWORK_ERROR; + } + } + + return status; + } + + if (num_expected == 0) { + found_status = true; + found_size = true; + } + + status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS)); + body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0); + + for (i=0; i < num_expected; i++) { + if (!NT_STATUS_EQUAL(status, expected[i].status)) { + continue; + } + + found_status = true; + if (expected[i].body_size == 0) { + found_size = true; + break; + } + + if (expected[i].body_size == body_size) { + found_size = true; + break; + } + } + + if (!found_status) { + return status; + } + + if (state->smb2.signing_skipped) { + if (num_expected > 0) { + return NT_STATUS_ACCESS_DENIED; + } + if (!NT_STATUS_IS_ERR(status)) { + return NT_STATUS_ACCESS_DENIED; + } + } + + if (!found_size) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + if (piov != NULL) { + *piov = talloc_move(mem_ctx, &state->smb2.recv_iov); + } + + return status; +} + +NTSTATUS smb2cli_req_get_sent_iov(struct tevent_req *req, + struct iovec *sent_iov) +{ + struct smbXcli_req_state *state = + tevent_req_data(req, + struct smbXcli_req_state); + + if (tevent_req_is_in_progress(req)) { + return NT_STATUS_PENDING; + } + + sent_iov[0].iov_base = state->smb2.hdr; + sent_iov[0].iov_len = sizeof(state->smb2.hdr); + + sent_iov[1].iov_base = discard_const(state->smb2.fixed); + sent_iov[1].iov_len = state->smb2.fixed_len; + + if (state->smb2.dyn != NULL) { + sent_iov[2].iov_base = discard_const(state->smb2.dyn); + sent_iov[2].iov_len = state->smb2.dyn_len; + } else { + sent_iov[2].iov_base = NULL; + sent_iov[2].iov_len = 0; + } + + return NT_STATUS_OK; +} + +static const struct { + enum protocol_types proto; + const char *smb1_name; +} smb1cli_prots[] = { + {PROTOCOL_CORE, "PC NETWORK PROGRAM 1.0"}, + {PROTOCOL_COREPLUS, "MICROSOFT NETWORKS 1.03"}, + {PROTOCOL_LANMAN1, "MICROSOFT NETWORKS 3.0"}, + {PROTOCOL_LANMAN1, "LANMAN1.0"}, + {PROTOCOL_LANMAN2, "LM1.2X002"}, + {PROTOCOL_LANMAN2, "DOS LANMAN2.1"}, + {PROTOCOL_LANMAN2, "LANMAN2.1"}, + {PROTOCOL_LANMAN2, "Samba"}, + {PROTOCOL_NT1, "NT LANMAN 1.0"}, + {PROTOCOL_NT1, "NT LM 0.12"}, + {PROTOCOL_SMB2_02, "SMB 2.002"}, + {PROTOCOL_SMB2_10, "SMB 2.???"}, +}; + +static const struct { + enum protocol_types proto; + uint16_t smb2_dialect; +} smb2cli_prots[] = { + {PROTOCOL_SMB2_02, SMB2_DIALECT_REVISION_202}, + {PROTOCOL_SMB2_10, SMB2_DIALECT_REVISION_210}, + {PROTOCOL_SMB3_00, SMB3_DIALECT_REVISION_300}, + {PROTOCOL_SMB3_02, SMB3_DIALECT_REVISION_302}, + {PROTOCOL_SMB3_11, SMB3_DIALECT_REVISION_311}, +}; + +struct smbXcli_negprot_state { + struct smbXcli_conn *conn; + struct tevent_context *ev; + struct smb2_negotiate_contexts *in_ctx; + struct smb2_negotiate_contexts *out_ctx; + uint32_t timeout_msec; + + struct { + uint8_t fixed[36]; + } smb2; +}; + +static void smbXcli_negprot_invalid_done(struct tevent_req *subreq); +static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state); +static void smbXcli_negprot_smb1_done(struct tevent_req *subreq); +static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state); +static void smbXcli_negprot_smb2_done(struct tevent_req *subreq); +static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn, + TALLOC_CTX *frame, + uint8_t *inbuf); + +struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbXcli_conn *conn, + uint32_t timeout_msec, + enum protocol_types min_protocol, + enum protocol_types max_protocol, + uint16_t max_credits, + struct smb2_negotiate_contexts *in_ctx) +{ + struct tevent_req *req, *subreq; + struct smbXcli_negprot_state *state; + + req = tevent_req_create(mem_ctx, &state, + struct smbXcli_negprot_state); + if (req == NULL) { + return NULL; + } + state->conn = conn; + state->ev = ev; + state->in_ctx = in_ctx; + state->timeout_msec = timeout_msec; + + if (min_protocol == PROTOCOL_NONE) { + tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX); + return tevent_req_post(req, ev); + } + + if (max_protocol == PROTOCOL_NONE) { + tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX); + return tevent_req_post(req, ev); + } + + if (min_protocol > max_protocol) { + tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX); + return tevent_req_post(req, ev); + } + + conn->min_protocol = min_protocol; + conn->max_protocol = max_protocol; + conn->protocol = PROTOCOL_NONE; + + if (max_protocol >= PROTOCOL_SMB2_02) { + conn->smb2.max_credits = max_credits; + } + + if ((min_protocol < PROTOCOL_SMB2_02) && + (max_protocol < PROTOCOL_SMB2_02)) { + /* + * SMB1 only... + */ + conn->dispatch_incoming = smb1cli_conn_dispatch_incoming; + + subreq = smbXcli_negprot_smb1_subreq(state); + if (tevent_req_nomem(subreq, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req); + return req; + } + + if ((min_protocol >= PROTOCOL_SMB2_02) && + (max_protocol >= PROTOCOL_SMB2_02)) { + /* + * SMB2 only... + */ + conn->dispatch_incoming = smb2cli_conn_dispatch_incoming; + + subreq = smbXcli_negprot_smb2_subreq(state); + if (tevent_req_nomem(subreq, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req); + return req; + } + + /* + * We send an SMB1 negprot with the SMB2 dialects + * and expect a SMB1 or a SMB2 response. + * + * smbXcli_negprot_dispatch_incoming() will fix the + * callback to match protocol of the response. + */ + conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming; + + subreq = smbXcli_negprot_smb1_subreq(state); + if (tevent_req_nomem(subreq, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req); + return req; +} + +static void smbXcli_negprot_invalid_done(struct tevent_req *subreq) +{ + struct tevent_req *req = + tevent_req_callback_data(subreq, + struct tevent_req); + NTSTATUS status; + + /* + * we just want the low level error + */ + status = tevent_req_simple_recv_ntstatus(subreq); + TALLOC_FREE(subreq); + if (tevent_req_nterror(req, status)) { + return; + } + + /* this should never happen */ + tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR); +} + +static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state) +{ + size_t i; + DATA_BLOB bytes = data_blob_null; + uint8_t flags; + uint16_t flags2; + + /* setup the protocol strings */ + for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) { + uint8_t c = 2; + bool ok; + + if (smb1cli_prots[i].proto < state->conn->min_protocol) { + continue; + } + + if (smb1cli_prots[i].proto > state->conn->max_protocol) { + continue; + } + + ok = data_blob_append(state, &bytes, &c, sizeof(c)); + if (!ok) { + return NULL; + } + + /* + * We now it is already ascii and + * we want NULL termination. + */ + ok = data_blob_append(state, &bytes, + smb1cli_prots[i].smb1_name, + strlen(smb1cli_prots[i].smb1_name)+1); + if (!ok) { + return NULL; + } + } + + smb1cli_req_flags(state->conn->max_protocol, + state->conn->smb1.client.capabilities, + SMBnegprot, + 0, 0, &flags, + 0, 0, &flags2); + + return smb1cli_req_send(state, state->ev, state->conn, + SMBnegprot, + flags, ~flags, + flags2, ~flags2, + state->timeout_msec, + 0xFFFE, 0, NULL, /* pid, tid, session */ + 0, NULL, /* wct, vwv */ + bytes.length, bytes.data); +} + +static void smbXcli_negprot_smb1_done(struct tevent_req *subreq) +{ + struct tevent_req *req = + tevent_req_callback_data(subreq, + struct tevent_req); + struct smbXcli_negprot_state *state = + tevent_req_data(req, + struct smbXcli_negprot_state); + struct smbXcli_conn *conn = state->conn; + struct iovec *recv_iov = NULL; + uint8_t *inhdr = NULL; + uint8_t wct; + uint16_t *vwv; + uint32_t num_bytes; + uint8_t *bytes; + NTSTATUS status; + uint16_t protnum; + size_t i; + size_t num_prots = 0; + uint8_t flags; + uint32_t client_capabilities = conn->smb1.client.capabilities; + uint32_t both_capabilities; + uint32_t server_capabilities = 0; + uint32_t capabilities; + uint32_t client_max_xmit = conn->smb1.client.max_xmit; + uint32_t server_max_xmit = 0; + uint32_t max_xmit; + uint32_t server_max_mux = 0; + uint16_t server_security_mode = 0; + uint32_t server_session_key = 0; + bool server_readbraw = false; + bool server_writebraw = false; + bool server_lockread = false; + bool server_writeunlock = false; + struct GUID server_guid = GUID_zero(); + DATA_BLOB server_gss_blob = data_blob_null; + uint8_t server_challenge[8]; + char *server_workgroup = NULL; + char *server_name = NULL; + int server_time_zone = 0; + NTTIME server_system_time = 0; + static const struct smb1cli_req_expected_response expected[] = { + { + .status = NT_STATUS_OK, + .wct = 0x11, /* NT1 */ + }, + { + .status = NT_STATUS_OK, + .wct = 0x0D, /* LM */ + }, + { + .status = NT_STATUS_OK, + .wct = 0x01, /* CORE */ + } + }; + + ZERO_STRUCT(server_challenge); + + status = smb1cli_req_recv(subreq, state, + &recv_iov, + &inhdr, + &wct, + &vwv, + NULL, /* pvwv_offset */ + &num_bytes, + &bytes, + NULL, /* pbytes_offset */ + NULL, /* pinbuf */ + expected, ARRAY_SIZE(expected)); + TALLOC_FREE(subreq); + if (tevent_req_nterror(req, status)) { + return; + } + if (inhdr == NULL) { + tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR); + return; + } + + flags = CVAL(inhdr, HDR_FLG); + + protnum = SVAL(vwv, 0); + + for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) { + if (smb1cli_prots[i].proto < state->conn->min_protocol) { + continue; + } + + if (smb1cli_prots[i].proto > state->conn->max_protocol) { + continue; + } + + if (protnum != num_prots) { + num_prots++; + continue; + } + + conn->protocol = smb1cli_prots[i].proto; + break; + } + + if (conn->protocol == PROTOCOL_NONE) { + DBG_ERR("No compatible protocol selected by server.\n"); + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) { + DEBUG(0,("smbXcli_negprot: SMB signing is mandatory " + "and the selected protocol level doesn't support it.\n")); + tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED); + return; + } + + if (flags & FLAG_SUPPORT_LOCKREAD) { + server_lockread = true; + server_writeunlock = true; + } + + if (conn->protocol >= PROTOCOL_NT1) { + const char *client_signing = NULL; + bool server_mandatory = false; + bool server_allowed = false; + const char *server_signing = NULL; + bool ok; + uint8_t key_len; + + if (wct != 0x11) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + /* NT protocol */ + server_security_mode = CVAL(vwv + 1, 0); + server_max_mux = SVAL(vwv + 1, 1); + server_max_xmit = IVAL(vwv + 3, 1); + server_session_key = IVAL(vwv + 7, 1); + server_time_zone = SVALS(vwv + 15, 1); + server_time_zone *= 60; + /* this time arrives in real GMT */ + server_system_time = BVAL(vwv + 11, 1); + server_capabilities = IVAL(vwv + 9, 1); + + key_len = CVAL(vwv + 16, 1); + + if (server_capabilities & CAP_RAW_MODE) { + server_readbraw = true; + server_writebraw = true; + } + if (server_capabilities & CAP_LOCK_AND_READ) { + server_lockread = true; + } + + if (server_capabilities & CAP_EXTENDED_SECURITY) { + DATA_BLOB blob1, blob2; + + if (num_bytes < 16) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + blob1 = data_blob_const(bytes, 16); + status = GUID_from_data_blob(&blob1, &server_guid); + if (tevent_req_nterror(req, status)) { + return; + } + + blob1 = data_blob_const(bytes+16, num_bytes-16); + blob2 = data_blob_dup_talloc(state, blob1); + if (blob1.length > 0 && + tevent_req_nomem(blob2.data, req)) { + return; + } + server_gss_blob = blob2; + } else { + DATA_BLOB blob1, blob2; + + if (num_bytes < key_len) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (key_len != 0 && key_len != 8) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (key_len == 8) { + memcpy(server_challenge, bytes, 8); + } + + blob1 = data_blob_const(bytes+key_len, num_bytes-key_len); + blob2 = data_blob_const(bytes+key_len, num_bytes-key_len); + if (blob1.length > 0) { + size_t len; + + len = utf16_len_n(blob1.data, + blob1.length); + blob1.length = len; + + ok = convert_string_talloc(state, + CH_UTF16LE, + CH_UNIX, + blob1.data, + blob1.length, + &server_workgroup, + &len); + if (!ok) { + status = map_nt_error_from_unix_common(errno); + tevent_req_nterror(req, status); + return; + } + } + + blob2.data += blob1.length; + blob2.length -= blob1.length; + if (blob2.length > 0) { + size_t len; + + len = utf16_len_n(blob1.data, + blob1.length); + blob1.length = len; + + ok = convert_string_talloc(state, + CH_UTF16LE, + CH_UNIX, + blob2.data, + blob2.length, + &server_name, + &len); + if (!ok) { + status = map_nt_error_from_unix_common(errno); + tevent_req_nterror(req, status); + return; + } + } + } + + client_signing = "disabled"; + if (conn->allow_signing) { + client_signing = "allowed"; + } + if (conn->mandatory_signing) { + client_signing = "required"; + } + + server_signing = "not supported"; + if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) { + server_signing = "supported"; + server_allowed = true; + } else if (conn->mandatory_signing) { + /* + * We have mandatory signing as client + * lets assume the server will look at our + * FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED + * flag in the session setup + */ + server_signing = "not announced"; + server_allowed = true; + } + if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) { + server_signing = "required"; + server_mandatory = true; + } + + ok = smb1_signing_set_negotiated(conn->smb1.signing, + server_allowed, + server_mandatory); + if (!ok) { + DEBUG(1,("cli_negprot: SMB signing is required, " + "but client[%s] and server[%s] mismatch\n", + client_signing, server_signing)); + tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED); + return; + } + + } else if (conn->protocol >= PROTOCOL_LANMAN1) { + DATA_BLOB blob1; + uint8_t key_len; + time_t t; + + if (wct != 0x0D) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + server_security_mode = SVAL(vwv + 1, 0); + server_max_xmit = SVAL(vwv + 2, 0); + server_max_mux = SVAL(vwv + 3, 0); + server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0); + server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0); + server_session_key = IVAL(vwv + 6, 0); + server_time_zone = SVALS(vwv + 10, 0); + server_time_zone *= 60; + /* this time is converted to GMT by make_unix_date */ + t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone); + unix_to_nt_time(&server_system_time, t); + key_len = SVAL(vwv + 11, 0); + + if (num_bytes < key_len) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (key_len != 0 && key_len != 8) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (key_len == 8) { + memcpy(server_challenge, bytes, 8); + } + + blob1 = data_blob_const(bytes+key_len, num_bytes-key_len); + if (blob1.length > 0) { + size_t len; + bool ok; + + len = utf16_len_n(blob1.data, + blob1.length); + blob1.length = len; + + ok = convert_string_talloc(state, + CH_DOS, + CH_UNIX, + blob1.data, + blob1.length, + &server_workgroup, + &len); + if (!ok) { + status = map_nt_error_from_unix_common(errno); + tevent_req_nterror(req, status); + return; + } + } + + } else { + /* the old core protocol */ + server_time_zone = get_time_zone(time(NULL)); + server_max_xmit = 1024; + server_max_mux = 1; + } + + if (server_max_xmit < 1024) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (server_max_mux < 1) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + /* + * Now calculate the negotiated capabilities + * based on the mask for: + * - client only flags + * - flags used in both directions + * - server only flags + */ + both_capabilities = client_capabilities & server_capabilities; + capabilities = client_capabilities & SMB_CAP_CLIENT_MASK; + capabilities |= both_capabilities & SMB_CAP_BOTH_MASK; + capabilities |= server_capabilities & SMB_CAP_SERVER_MASK; + + max_xmit = MIN(client_max_xmit, server_max_xmit); + + conn->smb1.server.capabilities = server_capabilities; + conn->smb1.capabilities = capabilities; + + conn->smb1.server.max_xmit = server_max_xmit; + conn->smb1.max_xmit = max_xmit; + + conn->smb1.server.max_mux = server_max_mux; + + conn->smb1.server.security_mode = server_security_mode; + + conn->smb1.server.readbraw = server_readbraw; + conn->smb1.server.writebraw = server_writebraw; + conn->smb1.server.lockread = server_lockread; + conn->smb1.server.writeunlock = server_writeunlock; + + conn->smb1.server.session_key = server_session_key; + + talloc_steal(conn, server_gss_blob.data); + conn->smb1.server.gss_blob = server_gss_blob; + conn->smb1.server.guid = server_guid; + memcpy(conn->smb1.server.challenge, server_challenge, 8); + conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup); + conn->smb1.server.name = talloc_move(conn, &server_name); + + conn->smb1.server.time_zone = server_time_zone; + conn->smb1.server.system_time = server_system_time; + + tevent_req_done(req); +} + +static size_t smbXcli_padding_helper(uint32_t offset, size_t n) +{ + if ((offset & (n-1)) == 0) return 0; + return n - (offset & (n-1)); +} + +static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state) +{ + size_t i; + uint8_t *buf; + uint16_t dialect_count = 0; + DATA_BLOB dyn = data_blob_null; + + for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) { + bool ok; + uint8_t val[2]; + + if (smb2cli_prots[i].proto < state->conn->min_protocol) { + continue; + } + + if (smb2cli_prots[i].proto > state->conn->max_protocol) { + continue; + } + + SSVAL(val, 0, smb2cli_prots[i].smb2_dialect); + + ok = data_blob_append(state, &dyn, val, sizeof(val)); + if (!ok) { + return NULL; + } + + dialect_count++; + } + + buf = state->smb2.fixed; + SSVAL(buf, 0, 36); + SSVAL(buf, 2, dialect_count); + SSVAL(buf, 4, state->conn->smb2.client.security_mode); + SSVAL(buf, 6, 0); /* Reserved */ + if (state->conn->max_protocol >= PROTOCOL_SMB3_00) { + SIVAL(buf, 8, state->conn->smb2.client.capabilities); + } else { + SIVAL(buf, 8, 0); /* Capabilities */ + } + if (state->conn->max_protocol >= PROTOCOL_SMB2_10) { + NTSTATUS status; + struct GUID_ndr_buf guid_buf = { .buf = {0}, }; + + status = GUID_to_ndr_buf(&state->conn->smb2.client.guid, + &guid_buf); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + memcpy(buf+12, guid_buf.buf, 16); /* ClientGuid */ + } else { + memset(buf+12, 0, 16); /* ClientGuid */ + } + + if (state->conn->max_protocol >= PROTOCOL_SMB3_11) { + const struct smb3_signing_capabilities *client_sign_algos = + &state->conn->smb2.client.smb3_capabilities.signing; + const struct smb3_encryption_capabilities *client_ciphers = + &state->conn->smb2.client.smb3_capabilities.encryption; + NTSTATUS status; + struct smb2_negotiate_contexts c = { .num_contexts = 0, }; + uint8_t *netname_utf16 = NULL; + size_t netname_utf16_len = 0; + uint32_t offset; + DATA_BLOB b; + uint8_t p[38]; + const uint8_t zeros[8] = {0, }; + size_t pad; + bool ok; + + SSVAL(p, 0, 1); /* HashAlgorithmCount */ + SSVAL(p, 2, 32); /* SaltLength */ + SSVAL(p, 4, SMB2_PREAUTH_INTEGRITY_SHA512); + generate_random_buffer(p + 6, 32); + + status = smb2_negotiate_context_add( + state, &c, SMB2_PREAUTH_INTEGRITY_CAPABILITIES, p, 38); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + + if (client_ciphers->num_algos > 0) { + size_t ofs = 0; + SSVAL(p, ofs, client_ciphers->num_algos); + ofs += 2; + + for (i = 0; i < client_ciphers->num_algos; i++) { + size_t next_ofs = ofs + 2; + SMB_ASSERT(next_ofs < ARRAY_SIZE(p)); + SSVAL(p, ofs, client_ciphers->algos[i]); + ofs = next_ofs; + } + + status = smb2_negotiate_context_add( + state, &c, SMB2_ENCRYPTION_CAPABILITIES, p, ofs); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + } + + if (client_sign_algos->num_algos > 0) { + size_t ofs = 0; + SSVAL(p, ofs, client_sign_algos->num_algos); + ofs += 2; + + for (i = 0; i < client_sign_algos->num_algos; i++) { + size_t next_ofs = ofs + 2; + SMB_ASSERT(next_ofs < ARRAY_SIZE(p)); + SSVAL(p, ofs, client_sign_algos->algos[i]); + ofs = next_ofs; + } + + status = smb2_negotiate_context_add( + state, &c, SMB2_SIGNING_CAPABILITIES, p, ofs); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + } + + ok = convert_string_talloc(state, CH_UNIX, CH_UTF16, + state->conn->remote_name, + strlen(state->conn->remote_name), + &netname_utf16, &netname_utf16_len); + if (!ok) { + return NULL; + } + + status = smb2_negotiate_context_add(state, &c, + SMB2_NETNAME_NEGOTIATE_CONTEXT_ID, + netname_utf16, netname_utf16_len); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + + if (state->in_ctx != NULL) { + struct smb2_negotiate_contexts *ctxs = state->in_ctx; + + for (i=0; i<ctxs->num_contexts; i++) { + struct smb2_negotiate_context *ctx = + &ctxs->contexts[i]; + + status = smb2_negotiate_context_add( + state, + &c, + ctx->type, + ctx->data.data, + ctx->data.length); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + } + } + + status = smb2_negotiate_context_push(state, &b, c); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + + offset = SMB2_HDR_BODY + sizeof(state->smb2.fixed) + dyn.length; + pad = smbXcli_padding_helper(offset, 8); + + ok = data_blob_append(state, &dyn, zeros, pad); + if (!ok) { + return NULL; + } + offset += pad; + + ok = data_blob_append(state, &dyn, b.data, b.length); + if (!ok) { + return NULL; + } + + SIVAL(buf, 28, offset); /* NegotiateContextOffset */ + SSVAL(buf, 32, c.num_contexts); /* NegotiateContextCount */ + SSVAL(buf, 34, 0); /* Reserved */ + } else { + SBVAL(buf, 28, 0); /* Reserved/ClientStartTime */ + } + + return smb2cli_req_send(state, state->ev, + state->conn, SMB2_OP_NEGPROT, + 0, 0, /* flags */ + state->timeout_msec, + NULL, NULL, /* tcon, session */ + state->smb2.fixed, sizeof(state->smb2.fixed), + dyn.data, dyn.length, + UINT16_MAX); /* max_dyn_len */ +} + +static NTSTATUS smbXcli_negprot_smb3_check_capabilities(struct tevent_req *req); + +static void smbXcli_negprot_smb2_done(struct tevent_req *subreq) +{ + struct tevent_req *req = + tevent_req_callback_data(subreq, + struct tevent_req); + struct smbXcli_negprot_state *state = + tevent_req_data(req, + struct smbXcli_negprot_state); + struct smbXcli_conn *conn = state->conn; + size_t security_offset, security_length; + DATA_BLOB blob; + NTSTATUS status; + struct iovec *iov = NULL; + uint8_t *body; + size_t i; + uint16_t dialect_revision; + uint32_t negotiate_context_offset = 0; + uint16_t negotiate_context_count = 0; + DATA_BLOB negotiate_context_blob = data_blob_null; + size_t avail; + size_t ctx_ofs; + size_t needed; + struct smb2_negotiate_context *preauth = NULL; + uint16_t hash_count; + uint16_t salt_length; + uint16_t hash_selected; + gnutls_hash_hd_t hash_hnd = NULL; + struct smb2_negotiate_context *sign_algo = NULL; + struct smb2_negotiate_context *cipher = NULL; + struct iovec sent_iov[3] = {{0}, {0}, {0}}; + static const struct smb2cli_req_expected_response expected[] = { + { + .status = NT_STATUS_OK, + .body_size = 0x41 + } + }; + int rc; + + status = smb2cli_req_recv(subreq, state, &iov, + expected, ARRAY_SIZE(expected)); + if (tevent_req_nterror(req, status)) { + return; + } + if (iov == NULL) { + tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR); + return; + } + + body = (uint8_t *)iov[1].iov_base; + + dialect_revision = SVAL(body, 4); + + for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) { + if (smb2cli_prots[i].proto < state->conn->min_protocol) { + continue; + } + + if (smb2cli_prots[i].proto > state->conn->max_protocol) { + continue; + } + + if (smb2cli_prots[i].smb2_dialect != dialect_revision) { + continue; + } + + conn->protocol = smb2cli_prots[i].proto; + break; + } + + if (conn->protocol == PROTOCOL_NONE) { + TALLOC_FREE(subreq); + + if (state->conn->min_protocol >= PROTOCOL_SMB2_02) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (dialect_revision != SMB2_DIALECT_REVISION_2FF) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + /* make sure we do not loop forever */ + state->conn->min_protocol = PROTOCOL_SMB2_02; + + /* + * send a SMB2 negprot, in order to negotiate + * the SMB2 dialect. + */ + subreq = smbXcli_negprot_smb2_subreq(state); + if (tevent_req_nomem(subreq, req)) { + return; + } + tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req); + return; + } + + conn->smb2.server.security_mode = SVAL(body, 2); + if (conn->protocol >= PROTOCOL_SMB3_11) { + negotiate_context_count = SVAL(body, 6); + } + + blob = data_blob_const(body + 8, 16); + status = GUID_from_data_blob(&blob, &conn->smb2.server.guid); + if (tevent_req_nterror(req, status)) { + return; + } + + conn->smb2.server.capabilities = IVAL(body, 24); + conn->smb2.server.max_trans_size= IVAL(body, 28); + conn->smb2.server.max_read_size = IVAL(body, 32); + conn->smb2.server.max_write_size= IVAL(body, 36); + conn->smb2.server.system_time = BVAL(body, 40); + conn->smb2.server.start_time = BVAL(body, 48); + + if (conn->smb2.server.max_trans_size == 0 || + conn->smb2.server.max_read_size == 0 || + conn->smb2.server.max_write_size == 0) { + /* + * We can't connect to servers we can't + * do any operations on. + */ + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + security_offset = SVAL(body, 56); + security_length = SVAL(body, 58); + + if (security_offset == 0) { + /* + * Azure sends security_offset = 0 and security_length = 0 + * + * We just set security_offset to the expected value + * in order to allow the further logic to work + * as before. + */ + if (security_length != 0) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + security_offset = SMB2_HDR_BODY + iov[1].iov_len; + } + + if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (security_length > iov[2].iov_len) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + conn->smb2.server.gss_blob = data_blob_talloc(conn, + iov[2].iov_base, + security_length); + if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) { + return; + } + + if (conn->protocol >= PROTOCOL_SMB3_00) { + conn->smb2.server.sign_algo = SMB2_SIGNING_AES128_CMAC; + } else { + conn->smb2.server.sign_algo = SMB2_SIGNING_HMAC_SHA256; + } + + if (conn->protocol < PROTOCOL_SMB3_11) { + TALLOC_FREE(subreq); + + if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) { + conn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM; + } + + status = smbXcli_negprot_smb3_check_capabilities(req); + if (tevent_req_nterror(req, status)) { + return; + } + + tevent_req_done(req); + return; + } + + /* + * Here we are now at SMB3_11, so encryption should be + * negotiated via context, not capabilities. + */ + + if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) { + /* + * Server set SMB2_CAP_ENCRYPTION capability, + * but *SHOULD* not, not *MUST* not. Just mask it off. + * NetApp seems to do this: + * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13009 + */ + conn->smb2.server.capabilities &= ~SMB2_CAP_ENCRYPTION; + } + + negotiate_context_offset = IVAL(body, 60); + if (negotiate_context_offset < security_offset) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + ctx_ofs = negotiate_context_offset - security_offset; + if (ctx_ofs > iov[2].iov_len) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + avail = iov[2].iov_len - security_length; + needed = iov[2].iov_len - ctx_ofs; + if (needed > avail) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + negotiate_context_blob.data = (uint8_t *)iov[2].iov_base; + negotiate_context_blob.length = iov[2].iov_len; + + negotiate_context_blob.data += ctx_ofs; + negotiate_context_blob.length -= ctx_ofs; + + state->out_ctx = talloc_zero(state, struct smb2_negotiate_contexts); + if (tevent_req_nomem(state->out_ctx, req)) { + return; + } + + status = smb2_negotiate_context_parse(state->out_ctx, + negotiate_context_blob, + negotiate_context_count, + state->out_ctx); + if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) { + status = NT_STATUS_INVALID_NETWORK_RESPONSE; + } + if (tevent_req_nterror(req, status)) { + return; + } + + preauth = smb2_negotiate_context_find( + state->out_ctx, SMB2_PREAUTH_INTEGRITY_CAPABILITIES); + if (preauth == NULL) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (preauth->data.length < 6) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + hash_count = SVAL(preauth->data.data, 0); + salt_length = SVAL(preauth->data.data, 2); + hash_selected = SVAL(preauth->data.data, 4); + + if (hash_count != 1) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (preauth->data.length != (6 + salt_length)) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (hash_selected != SMB2_PREAUTH_INTEGRITY_SHA512) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + sign_algo = smb2_negotiate_context_find( + state->out_ctx, SMB2_SIGNING_CAPABILITIES); + if (sign_algo != NULL) { + const struct smb3_signing_capabilities *client_sign_algos = + &state->conn->smb2.client.smb3_capabilities.signing; + bool found_selected = false; + uint16_t sign_algo_count; + uint16_t sign_algo_selected; + + if (client_sign_algos->num_algos == 0) { + /* + * We didn't ask for SMB2_ENCRYPTION_CAPABILITIES + */ + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (sign_algo->data.length < 2) { + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + sign_algo_count = SVAL(sign_algo->data.data, 0); + if (sign_algo_count != 1) { + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (sign_algo->data.length < (2 + 2 * sign_algo_count)) { + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + sign_algo_selected = SVAL(sign_algo->data.data, 2); + + for (i = 0; i < client_sign_algos->num_algos; i++) { + if (client_sign_algos->algos[i] == sign_algo_selected) { + /* + * We found a match + */ + found_selected = true; + break; + } + } + + if (!found_selected) { + /* + * The server send a sign_algo we didn't offer. + */ + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + conn->smb2.server.sign_algo = sign_algo_selected; + } + + cipher = smb2_negotiate_context_find( + state->out_ctx, SMB2_ENCRYPTION_CAPABILITIES); + if (cipher != NULL) { + const struct smb3_encryption_capabilities *client_ciphers = + &state->conn->smb2.client.smb3_capabilities.encryption; + bool found_selected = false; + uint16_t cipher_count; + uint16_t cipher_selected; + + if (client_ciphers->num_algos == 0) { + /* + * We didn't ask for SMB2_ENCRYPTION_CAPABILITIES + */ + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (cipher->data.length < 2) { + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + cipher_count = SVAL(cipher->data.data, 0); + if (cipher_count != 1) { + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + if (cipher->data.length < (2 + 2 * cipher_count)) { + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + cipher_selected = SVAL(cipher->data.data, 2); + + for (i = 0; i < client_ciphers->num_algos; i++) { + if (cipher_selected == SMB2_ENCRYPTION_NONE) { + /* + * encryption not supported + */ + found_selected = true; + break; + } + if (client_ciphers->algos[i] == cipher_selected) { + /* + * We found a match + */ + found_selected = true; + break; + } + } + + if (!found_selected) { + /* + * The server send a cipher we didn't offer. + */ + tevent_req_nterror(req, + NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + conn->smb2.server.cipher = cipher_selected; + } + + /* First we hash the request */ + smb2cli_req_get_sent_iov(subreq, sent_iov); + + rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_SHA512); + if (rc < 0) { + tevent_req_nterror(req, + gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED)); + return; + } + + rc = gnutls_hash(hash_hnd, + conn->smb2.preauth_sha512, + sizeof(conn->smb2.preauth_sha512)); + if (rc < 0) { + gnutls_hash_deinit(hash_hnd, NULL); + tevent_req_nterror(req, + gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED)); + return; + } + for (i = 0; i < 3; i++) { + rc = gnutls_hash(hash_hnd, + sent_iov[i].iov_base, + sent_iov[i].iov_len); + if (rc < 0) { + gnutls_hash_deinit(hash_hnd, NULL); + tevent_req_nterror(req, + gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED)); + return; + } + } + + if (rc < 0) { + gnutls_hash_deinit(hash_hnd, NULL); + tevent_req_nterror(req, + gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED)); + return; + } + + /* This resets the hash state */ + gnutls_hash_output(hash_hnd, conn->smb2.preauth_sha512); + TALLOC_FREE(subreq); + + /* And now we hash the response */ + rc = gnutls_hash(hash_hnd, + conn->smb2.preauth_sha512, + sizeof(conn->smb2.preauth_sha512)); + if (rc < 0) { + gnutls_hash_deinit(hash_hnd, NULL); + tevent_req_nterror(req, + gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED)); + return; + } + for (i = 0; i < 3; i++) { + rc = gnutls_hash(hash_hnd, + iov[i].iov_base, + iov[i].iov_len); + if (rc < 0) { + gnutls_hash_deinit(hash_hnd, NULL); + tevent_req_nterror(req, + gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED)); + return; + } + } + gnutls_hash_deinit(hash_hnd, conn->smb2.preauth_sha512); + if (rc < 0) { + tevent_req_nterror(req, + NT_STATUS_UNSUCCESSFUL); + return; + } + + status = smbXcli_negprot_smb3_check_capabilities(req); + if (tevent_req_nterror(req, status)) { + return; + } + + tevent_req_done(req); +} + +static NTSTATUS smbXcli_negprot_smb3_check_capabilities(struct tevent_req *req) +{ + struct smbXcli_negprot_state *state = + tevent_req_data(req, + struct smbXcli_negprot_state); + struct smbXcli_conn *conn = state->conn; + + return smb311_capabilities_check(&conn->smb2.client.smb3_capabilities, + "smbXcli_negprot", + DBGLVL_ERR, + NT_STATUS_ACCESS_DENIED, + "client", + conn->protocol, + conn->smb2.server.sign_algo, + conn->smb2.server.cipher); +} + +static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn, + TALLOC_CTX *tmp_mem, + uint8_t *inbuf) +{ + size_t num_pending = talloc_array_length(conn->pending); + struct tevent_req *subreq; + struct smbXcli_req_state *substate; + struct tevent_req *req; + uint32_t protocol_magic; + size_t inbuf_len = smb_len_nbt(inbuf); + + if (num_pending != 1) { + return NT_STATUS_INTERNAL_ERROR; + } + + if (inbuf_len < 4) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + subreq = conn->pending[0]; + substate = tevent_req_data(subreq, struct smbXcli_req_state); + req = tevent_req_callback_data(subreq, struct tevent_req); + + protocol_magic = IVAL(inbuf, 4); + + switch (protocol_magic) { + case SMB_MAGIC: + tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req); + conn->dispatch_incoming = smb1cli_conn_dispatch_incoming; + return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf); + + case SMB2_MAGIC: + if (substate->smb2.recv_iov == NULL) { + /* + * For the SMB1 negprot we have move it. + */ + substate->smb2.recv_iov = substate->smb1.recv_iov; + substate->smb1.recv_iov = NULL; + } + + /* + * we got an SMB2 answer, which consumed sequence number 0 + * so we need to use 1 as the next one. + * + * we also need to set the current credits to 0 + * as we consumed the initial one. The SMB2 answer + * hopefully grant us a new credit. + */ + conn->smb2.mid = 1; + conn->smb2.cur_credits = 0; + tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req); + conn->dispatch_incoming = smb2cli_conn_dispatch_incoming; + return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf); + } + + DEBUG(10, ("Got non-SMB PDU\n")); + return NT_STATUS_INVALID_NETWORK_RESPONSE; +} + +NTSTATUS smbXcli_negprot_recv( + struct tevent_req *req, + TALLOC_CTX *mem_ctx, + struct smb2_negotiate_contexts **out_ctx) +{ + struct smbXcli_negprot_state *state = tevent_req_data( + req, struct smbXcli_negprot_state); + NTSTATUS status; + + if (tevent_req_is_nterror(req, &status)) { + tevent_req_received(req); + return status; + } + + if (out_ctx != NULL) { + *out_ctx = talloc_move(mem_ctx, &state->out_ctx); + } + + tevent_req_received(req); + return NT_STATUS_OK; +} + +NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn, + uint32_t timeout_msec, + enum protocol_types min_protocol, + enum protocol_types max_protocol) +{ + TALLOC_CTX *frame = talloc_stackframe(); + struct tevent_context *ev; + struct tevent_req *req; + NTSTATUS status = NT_STATUS_NO_MEMORY; + bool ok; + + if (smbXcli_conn_has_async_calls(conn)) { + /* + * Can't use sync call while an async call is in flight + */ + status = NT_STATUS_INVALID_PARAMETER_MIX; + goto fail; + } + ev = samba_tevent_context_init(frame); + if (ev == NULL) { + goto fail; + } + req = smbXcli_negprot_send( + frame, + ev, + conn, + timeout_msec, + min_protocol, + max_protocol, + WINDOWS_CLIENT_PURE_SMB2_NEGPROT_INITIAL_CREDIT_ASK, + NULL); + if (req == NULL) { + goto fail; + } + ok = tevent_req_poll_ntstatus(req, ev, &status); + if (!ok) { + goto fail; + } + status = smbXcli_negprot_recv(req, NULL, NULL); + fail: + TALLOC_FREE(frame); + return status; +} + +struct smb2cli_validate_negotiate_info_state { + struct smbXcli_conn *conn; + DATA_BLOB in_input_buffer; + DATA_BLOB in_output_buffer; + DATA_BLOB out_input_buffer; + DATA_BLOB out_output_buffer; + uint16_t dialect; +}; + +static void smb2cli_validate_negotiate_info_done(struct tevent_req *subreq); + +struct tevent_req *smb2cli_validate_negotiate_info_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbXcli_conn *conn, + uint32_t timeout_msec, + struct smbXcli_session *session, + struct smbXcli_tcon *tcon) +{ + struct tevent_req *req; + struct smb2cli_validate_negotiate_info_state *state; + uint8_t *buf; + uint16_t dialect_count = 0; + struct tevent_req *subreq; + bool _save_should_sign; + size_t i; + + req = tevent_req_create(mem_ctx, &state, + struct smb2cli_validate_negotiate_info_state); + if (req == NULL) { + return NULL; + } + state->conn = conn; + + state->in_input_buffer = data_blob_talloc_zero(state, + 4 + 16 + 1 + 1 + 2); + if (tevent_req_nomem(state->in_input_buffer.data, req)) { + return tevent_req_post(req, ev); + } + buf = state->in_input_buffer.data; + + if (state->conn->max_protocol >= PROTOCOL_SMB3_00) { + SIVAL(buf, 0, conn->smb2.client.capabilities); + } else { + SIVAL(buf, 0, 0); /* Capabilities */ + } + if (state->conn->max_protocol >= PROTOCOL_SMB2_10) { + NTSTATUS status; + struct GUID_ndr_buf guid_buf = { .buf = {0}, }; + + status = GUID_to_ndr_buf(&conn->smb2.client.guid, + &guid_buf); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + memcpy(buf+4, guid_buf.buf, 16); /* ClientGuid */ + } else { + memset(buf+4, 0, 16); /* ClientGuid */ + } + if (state->conn->min_protocol >= PROTOCOL_SMB2_02) { + SCVAL(buf, 20, conn->smb2.client.security_mode); + } else { + SCVAL(buf, 20, 0); + } + SCVAL(buf, 21, 0); /* reserved */ + + for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) { + bool ok; + size_t ofs; + + if (smb2cli_prots[i].proto < state->conn->min_protocol) { + continue; + } + + if (smb2cli_prots[i].proto > state->conn->max_protocol) { + continue; + } + + if (smb2cli_prots[i].proto == state->conn->protocol) { + state->dialect = smb2cli_prots[i].smb2_dialect; + } + + ofs = state->in_input_buffer.length; + ok = data_blob_realloc(state, &state->in_input_buffer, + ofs + 2); + if (!ok) { + tevent_req_oom(req); + return tevent_req_post(req, ev); + } + + buf = state->in_input_buffer.data; + SSVAL(buf, ofs, smb2cli_prots[i].smb2_dialect); + + dialect_count++; + } + buf = state->in_input_buffer.data; + SSVAL(buf, 22, dialect_count); + + _save_should_sign = smb2cli_tcon_is_signing_on(tcon); + smb2cli_tcon_should_sign(tcon, true); + subreq = smb2cli_ioctl_send(state, ev, conn, + timeout_msec, session, tcon, + UINT64_MAX, /* in_fid_persistent */ + UINT64_MAX, /* in_fid_volatile */ + FSCTL_VALIDATE_NEGOTIATE_INFO, + 0, /* in_max_input_length */ + &state->in_input_buffer, + 24, /* in_max_output_length */ + &state->in_output_buffer, + SMB2_IOCTL_FLAG_IS_FSCTL); + smb2cli_tcon_should_sign(tcon, _save_should_sign); + if (tevent_req_nomem(subreq, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback(subreq, + smb2cli_validate_negotiate_info_done, + req); + + return req; +} + +static void smb2cli_validate_negotiate_info_done(struct tevent_req *subreq) +{ + struct tevent_req *req = + tevent_req_callback_data(subreq, + struct tevent_req); + struct smb2cli_validate_negotiate_info_state *state = + tevent_req_data(req, + struct smb2cli_validate_negotiate_info_state); + NTSTATUS status; + const uint8_t *buf; + uint32_t capabilities; + DATA_BLOB guid_blob; + struct GUID server_guid; + uint16_t security_mode; + uint16_t dialect; + + status = smb2cli_ioctl_recv(subreq, state, + &state->out_input_buffer, + &state->out_output_buffer); + TALLOC_FREE(subreq); + + /* + * This response must be signed correctly for + * these "normal" error codes to be processed. + * If the packet wasn't signed correctly we will get + * NT_STATUS_ACCESS_DENIED or NT_STATUS_HMAC_NOT_SUPPORTED, + * or NT_STATUS_INVALID_NETWORK_RESPONSE + * from smb2_signing_check_pdu(). + * + * We must never ignore the above errors here. + */ + + if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED)) { + /* + * The response was signed, but not supported + * + * Older Windows and Samba releases return + * NT_STATUS_FILE_CLOSED. + */ + tevent_req_done(req); + return; + } + if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_DEVICE_REQUEST)) { + /* + * The response was signed, but not supported + * + * This is returned by the NTVFS based Samba 4.x file server + * for file shares. + */ + tevent_req_done(req); + return; + } + if (NT_STATUS_EQUAL(status, NT_STATUS_FS_DRIVER_REQUIRED)) { + /* + * The response was signed, but not supported + * + * This is returned by the NTVFS based Samba 4.x file server + * for ipc shares. + */ + tevent_req_done(req); + return; + } + if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) { + /* + * The response was signed, but not supported + * + * This might be returned by older Windows versions or by + * NetApp SMB server implementations. + * + * See + * + * https://blogs.msdn.microsoft.com/openspecification/2012/06/28/smb3-secure-dialect-negotiation/ + * + */ + tevent_req_done(req); + return; + } + if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) { + /* + * The response was signed, but not supported + * + * This might be returned by NetApp Ontap 7.3.7 SMB server + * implementations. + * + * BUG: https://bugzilla.samba.org/show_bug.cgi?id=14607 + * + */ + tevent_req_done(req); + return; + } + if (tevent_req_nterror(req, status)) { + return; + } + + if (state->out_output_buffer.length != 24) { + tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE); + return; + } + + buf = state->out_output_buffer.data; + + capabilities = IVAL(buf, 0); + guid_blob = data_blob_const(buf + 4, 16); + status = GUID_from_data_blob(&guid_blob, &server_guid); + if (tevent_req_nterror(req, status)) { + return; + } + security_mode = CVAL(buf, 20); + dialect = SVAL(buf, 22); + + if (capabilities != state->conn->smb2.server.capabilities) { + tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED); + return; + } + + if (!GUID_equal(&server_guid, &state->conn->smb2.server.guid)) { + tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED); + return; + } + + if (security_mode != state->conn->smb2.server.security_mode) { + tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED); + return; + } + + if (dialect != state->dialect) { + tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED); + return; + } + + tevent_req_done(req); +} + +NTSTATUS smb2cli_validate_negotiate_info_recv(struct tevent_req *req) +{ + return tevent_req_simple_recv_ntstatus(req); +} + +static int smbXcli_session_destructor(struct smbXcli_session *session) +{ + if (session->conn == NULL) { + return 0; + } + + DLIST_REMOVE(session->conn->sessions, session); + return 0; +} + +struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx, + struct smbXcli_conn *conn) +{ + struct smbXcli_session *session; + NTSTATUS status; + + session = talloc_zero(mem_ctx, struct smbXcli_session); + if (session == NULL) { + return NULL; + } + session->smb2 = talloc_zero(session, struct smb2cli_session); + if (session->smb2 == NULL) { + talloc_free(session); + return NULL; + } + talloc_set_destructor(session, smbXcli_session_destructor); + + status = smb2_signing_key_sign_create(session->smb2, + conn->smb2.server.sign_algo, + NULL, /* no master key */ + NULL, /* derivations */ + &session->smb2->signing_key); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(session); + return NULL; + } + + DLIST_ADD_END(conn->sessions, session); + session->conn = conn; + + status = smb2_signing_key_sign_create(session, + conn->smb2.server.sign_algo, + NULL, /* no master key */ + NULL, /* derivations */ + &session->smb2_channel.signing_key); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(session); + return NULL; + } + + memcpy(session->smb2_channel.preauth_sha512, + conn->smb2.preauth_sha512, + sizeof(session->smb2_channel.preauth_sha512)); + + return session; +} + +struct smbXcli_session *smbXcli_session_shallow_copy(TALLOC_CTX *mem_ctx, + struct smbXcli_session *src) +{ + struct smbXcli_session *session; + struct timespec ts; + NTTIME nt; + + session = talloc_zero(mem_ctx, struct smbXcli_session); + if (session == NULL) { + return NULL; + } + session->smb2 = talloc_zero(session, struct smb2cli_session); + if (session->smb2 == NULL) { + talloc_free(session); + return NULL; + } + + /* + * Note we keep a pointer to the session keys of the + * main session and rely on the caller to free the + * shallow copy first! + */ + session->conn = src->conn; + *session->smb2 = *src->smb2; + session->smb2_channel = src->smb2_channel; + session->disconnect_expired = src->disconnect_expired; + + /* + * This is only supposed to be called in test code + * but we should not reuse nonces! + * + * Add the current timestamp as NTTIME to nonce_high + * and set nonce_low to a value we can recognize in captures. + */ + clock_gettime_mono(&ts); + nt = unix_timespec_to_nt_time(ts); + nt &= session->smb2->nonce_high_max; + if (nt == session->smb2->nonce_high_max || nt < UINT8_MAX) { + talloc_free(session); + return NULL; + } + session->smb2->nonce_high += nt; + session->smb2->nonce_low = UINT32_MAX; + + DLIST_ADD_END(src->conn->sessions, session); + talloc_set_destructor(session, smbXcli_session_destructor); + + return session; +} + +bool smbXcli_session_is_guest(struct smbXcli_session *session) +{ + if (session == NULL) { + return false; + } + + if (session->conn == NULL) { + return false; + } + + if (session->conn->mandatory_signing) { + return false; + } + + if (session->conn->protocol >= PROTOCOL_SMB2_02) { + if (session->smb2->session_flags & SMB2_SESSION_FLAG_IS_GUEST) { + return true; + } + return false; + } + + if (session->smb1.action & SMB_SETUP_GUEST) { + return true; + } + + return false; +} + +bool smbXcli_session_is_authenticated(struct smbXcli_session *session) +{ + const DATA_BLOB *application_key; + + if (session == NULL) { + return false; + } + + if (session->conn == NULL) { + return false; + } + + /* + * If we have an application key we had a session key negotiated + * at auth time. + */ + if (session->conn->protocol >= PROTOCOL_SMB2_02) { + if (!smb2_signing_key_valid(session->smb2->application_key)) { + return false; + } + application_key = &session->smb2->application_key->blob; + } else { + application_key = &session->smb1.application_key; + } + + if (application_key->length == 0) { + return false; + } + + return true; +} + +NTSTATUS smb2cli_session_signing_key(struct smbXcli_session *session, + TALLOC_CTX *mem_ctx, + DATA_BLOB *key) +{ + const struct smb2_signing_key *sig = NULL; + + if (session->conn == NULL) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + /* + * Use channel signing key if there is one, otherwise fallback + * to session. + */ + + if (smb2_signing_key_valid(session->smb2_channel.signing_key)) { + sig = session->smb2_channel.signing_key; + } else if (smb2_signing_key_valid(session->smb2->signing_key)) { + sig = session->smb2->signing_key; + } else { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + *key = data_blob_dup_talloc(mem_ctx, sig->blob); + if (key->data == NULL) { + return NT_STATUS_NO_MEMORY; + } + + return NT_STATUS_OK; +} + +NTSTATUS smb2cli_session_encryption_key(struct smbXcli_session *session, + TALLOC_CTX *mem_ctx, + DATA_BLOB *key) +{ + if (session->conn == NULL) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + if (session->conn->protocol < PROTOCOL_SMB3_00) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + if (!smb2_signing_key_valid(session->smb2->encryption_key)) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + *key = data_blob_dup_talloc(mem_ctx, session->smb2->encryption_key->blob); + if (key->data == NULL) { + return NT_STATUS_NO_MEMORY; + } + + return NT_STATUS_OK; +} + +NTSTATUS smb2cli_session_decryption_key(struct smbXcli_session *session, + TALLOC_CTX *mem_ctx, + DATA_BLOB *key) +{ + if (session->conn == NULL) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + if (session->conn->protocol < PROTOCOL_SMB3_00) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + if (!smb2_signing_key_valid(session->smb2->decryption_key)) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + *key = data_blob_dup_talloc(mem_ctx, session->smb2->decryption_key->blob); + if (key->data == NULL) { + return NT_STATUS_NO_MEMORY; + } + + return NT_STATUS_OK; +} + +NTSTATUS smbXcli_session_application_key(struct smbXcli_session *session, + TALLOC_CTX *mem_ctx, + DATA_BLOB *key) +{ + const DATA_BLOB *application_key; + + *key = data_blob_null; + + if (session->conn == NULL) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + if (session->conn->protocol >= PROTOCOL_SMB2_02) { + if (!smb2_signing_key_valid(session->smb2->application_key)) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + application_key = &session->smb2->application_key->blob; + } else { + application_key = &session->smb1.application_key; + } + + if (application_key->length == 0) { + return NT_STATUS_NO_USER_SESSION_KEY; + } + + *key = data_blob_dup_talloc(mem_ctx, *application_key); + if (key->data == NULL) { + return NT_STATUS_NO_MEMORY; + } + + return NT_STATUS_OK; +} + +void smbXcli_session_set_disconnect_expired(struct smbXcli_session *session) +{ + session->disconnect_expired = true; +} + +uint16_t smb1cli_session_current_id(struct smbXcli_session *session) +{ + return session->smb1.session_id; +} + +void smb1cli_session_set_id(struct smbXcli_session *session, + uint16_t session_id) +{ + session->smb1.session_id = session_id; +} + +void smb1cli_session_set_action(struct smbXcli_session *session, + uint16_t action) +{ + session->smb1.action = action; +} + +NTSTATUS smb1cli_session_set_session_key(struct smbXcli_session *session, + const DATA_BLOB _session_key) +{ + struct smbXcli_conn *conn = session->conn; + uint8_t session_key[16]; + + if (conn == NULL) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (session->smb1.application_key.length != 0) { + /* + * TODO: do not allow this... + * + * return NT_STATUS_INVALID_PARAMETER_MIX; + */ + data_blob_clear_free(&session->smb1.application_key); + session->smb1.protected_key = false; + } + + if (_session_key.length == 0) { + return NT_STATUS_OK; + } + + ZERO_STRUCT(session_key); + memcpy(session_key, _session_key.data, + MIN(_session_key.length, sizeof(session_key))); + + session->smb1.application_key = data_blob_talloc(session, + session_key, + sizeof(session_key)); + ZERO_STRUCT(session_key); + if (session->smb1.application_key.data == NULL) { + return NT_STATUS_NO_MEMORY; + } + + session->smb1.protected_key = false; + + return NT_STATUS_OK; +} + +NTSTATUS smb1cli_session_protect_session_key(struct smbXcli_session *session) +{ + NTSTATUS status; + + if (session->smb1.protected_key) { + /* already protected */ + return NT_STATUS_OK; + } + + if (session->smb1.application_key.length != 16) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + status = smb1_key_derivation(session->smb1.application_key.data, + session->smb1.application_key.length, + session->smb1.application_key.data); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + session->smb1.protected_key = true; + + return NT_STATUS_OK; +} + +uint8_t smb2cli_session_security_mode(struct smbXcli_session *session) +{ + struct smbXcli_conn *conn = session->conn; + uint8_t security_mode = 0; + + if (conn == NULL) { + return security_mode; + } + + security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED; + if (conn->mandatory_signing) { + security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED; + } + if (session->smb2->should_sign) { + security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED; + } + + return security_mode; +} + +uint64_t smb2cli_session_current_id(struct smbXcli_session *session) +{ + return session->smb2->session_id; +} + +uint16_t smb2cli_session_get_flags(struct smbXcli_session *session) +{ + return session->smb2->session_flags; +} + +void smb2cli_session_set_id_and_flags(struct smbXcli_session *session, + uint64_t session_id, + uint16_t session_flags) +{ + session->smb2->session_id = session_id; + session->smb2->session_flags = session_flags; +} + +void smb2cli_session_increment_channel_sequence(struct smbXcli_session *session) +{ + session->smb2->channel_sequence += 1; +} + +uint16_t smb2cli_session_reset_channel_sequence(struct smbXcli_session *session, + uint16_t channel_sequence) +{ + uint16_t prev_cs; + + prev_cs = session->smb2->channel_sequence; + session->smb2->channel_sequence = channel_sequence; + + return prev_cs; +} + +uint16_t smb2cli_session_current_channel_sequence(struct smbXcli_session *session) +{ + return session->smb2->channel_sequence; +} + +void smb2cli_session_start_replay(struct smbXcli_session *session) +{ + session->smb2->replay_active = true; +} + +void smb2cli_session_stop_replay(struct smbXcli_session *session) +{ + session->smb2->replay_active = false; +} + +void smb2cli_session_require_signed_response(struct smbXcli_session *session, + bool require_signed_response) +{ + session->smb2->require_signed_response = require_signed_response; +} + +NTSTATUS smb2cli_session_update_preauth(struct smbXcli_session *session, + const struct iovec *iov) +{ + gnutls_hash_hd_t hash_hnd = NULL; + size_t i; + int rc; + + if (session->conn == NULL) { + return NT_STATUS_INTERNAL_ERROR; + } + + if (session->conn->protocol < PROTOCOL_SMB3_11) { + return NT_STATUS_OK; + } + + if (smb2_signing_key_valid(session->smb2_channel.signing_key)) { + return NT_STATUS_OK; + } + + rc = gnutls_hash_init(&hash_hnd, + GNUTLS_DIG_SHA512); + if (rc < 0) { + return gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED); + } + + rc = gnutls_hash(hash_hnd, + session->smb2_channel.preauth_sha512, + sizeof(session->smb2_channel.preauth_sha512)); + if (rc < 0) { + gnutls_hash_deinit(hash_hnd, NULL); + return gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED); + } + for (i = 0; i < 3; i++) { + rc = gnutls_hash(hash_hnd, + iov[i].iov_base, + iov[i].iov_len); + if (rc < 0) { + gnutls_hash_deinit(hash_hnd, NULL); + return gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED); + } + } + gnutls_hash_deinit(hash_hnd, session->smb2_channel.preauth_sha512); + + return NT_STATUS_OK; +} + +NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session, + const DATA_BLOB _session_key, + const struct iovec *recv_iov) +{ + struct smbXcli_conn *conn = session->conn; + uint16_t no_sign_flags = 0; + bool check_signature = true; + uint32_t hdr_flags; + NTSTATUS status; + struct smb2_signing_derivations derivations = { + .signing = NULL, + }; + DATA_BLOB preauth_hash = data_blob_null; + size_t nonce_size = 0; + + if (conn == NULL) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (recv_iov[0].iov_len != SMB2_HDR_BODY) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (!conn->mandatory_signing) { + /* + * only allow guest sessions without + * mandatory signing. + * + * If we try an authentication with username != "" + * and the server let us in without verifying the + * password we don't have a negotiated session key + * for signing. + */ + no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST; + } + + if (session->smb2->session_flags & no_sign_flags) { + session->smb2->should_sign = false; + return NT_STATUS_OK; + } + + if (smb2_signing_key_valid(session->smb2->signing_key)) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (conn->protocol >= PROTOCOL_SMB3_11) { + preauth_hash = data_blob_const(session->smb2_channel.preauth_sha512, + sizeof(session->smb2_channel.preauth_sha512)); + } + + smb2_signing_derivations_fill_const_stack(&derivations, + conn->protocol, + preauth_hash); + + status = smb2_signing_key_sign_create(session->smb2, + conn->smb2.server.sign_algo, + &_session_key, + derivations.signing, + &session->smb2->signing_key); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + status = smb2_signing_key_cipher_create(session->smb2, + conn->smb2.server.cipher, + &_session_key, + derivations.cipher_c2s, + &session->smb2->encryption_key); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + status = smb2_signing_key_cipher_create(session->smb2, + conn->smb2.server.cipher, + &_session_key, + derivations.cipher_s2c, + &session->smb2->decryption_key); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + status = smb2_signing_key_sign_create(session->smb2, + conn->smb2.server.sign_algo, + &_session_key, + derivations.application, + &session->smb2->application_key); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + status = smb2_signing_key_copy(session, + session->smb2->signing_key, + &session->smb2_channel.signing_key); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + check_signature = conn->mandatory_signing; + + hdr_flags = IVAL(recv_iov[0].iov_base, SMB2_HDR_FLAGS); + if (hdr_flags & SMB2_HDR_FLAG_SIGNED) { + /* + * Sadly some vendors don't sign the + * final SMB2 session setup response + * + * At least Windows and Samba are always doing this + * if there's a session key available. + * + * We only check the signature if it's mandatory + * or SMB2_HDR_FLAG_SIGNED is provided. + */ + check_signature = true; + } + + if (conn->protocol >= PROTOCOL_SMB3_11) { + check_signature = true; + } + + if (check_signature) { + status = smb2_signing_check_pdu(session->smb2_channel.signing_key, + recv_iov, 3); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + session->smb2->should_sign = false; + session->smb2->should_encrypt = false; + + if (conn->desire_signing) { + session->smb2->should_sign = true; + } + + if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) { + session->smb2->should_sign = true; + } + + if (session->smb2->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) { + session->smb2->should_encrypt = true; + } + + if (conn->protocol < PROTOCOL_SMB3_00) { + session->smb2->should_encrypt = false; + } + + if (conn->smb2.server.cipher == 0) { + session->smb2->should_encrypt = false; + } + + /* + * CCM and GCM algorithms must never have their + * nonce wrap, or the security of the whole + * communication and the keys is destroyed. + * We must drop the connection once we have + * transfered too much data. + * + * NOTE: We assume nonces greater than 8 bytes. + */ + generate_nonce_buffer((uint8_t *)&session->smb2->nonce_high_random, + sizeof(session->smb2->nonce_high_random)); + switch (conn->smb2.server.cipher) { + case SMB2_ENCRYPTION_AES128_CCM: + nonce_size = SMB2_AES_128_CCM_NONCE_SIZE; + break; + case SMB2_ENCRYPTION_AES128_GCM: + nonce_size = gnutls_cipher_get_iv_size(GNUTLS_CIPHER_AES_128_GCM); + break; + case SMB2_ENCRYPTION_AES256_CCM: + nonce_size = SMB2_AES_128_CCM_NONCE_SIZE; + break; + case SMB2_ENCRYPTION_AES256_GCM: + nonce_size = gnutls_cipher_get_iv_size(GNUTLS_CIPHER_AES_256_GCM); + break; + default: + nonce_size = 0; + break; + } + session->smb2->nonce_high_max = SMB2_NONCE_HIGH_MAX(nonce_size); + session->smb2->nonce_high = 0; + session->smb2->nonce_low = 0; + + return NT_STATUS_OK; +} + +NTSTATUS smb2cli_session_create_channel(TALLOC_CTX *mem_ctx, + struct smbXcli_session *session1, + struct smbXcli_conn *conn, + struct smbXcli_session **_session2) +{ + struct smbXcli_session *session2; + NTSTATUS status; + + if (!smb2_signing_key_valid(session1->smb2->signing_key)) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (conn == NULL) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + session2 = talloc_zero(mem_ctx, struct smbXcli_session); + if (session2 == NULL) { + return NT_STATUS_NO_MEMORY; + } + session2->smb2 = talloc_reference(session2, session1->smb2); + if (session2->smb2 == NULL) { + talloc_free(session2); + return NT_STATUS_NO_MEMORY; + } + + talloc_set_destructor(session2, smbXcli_session_destructor); + DLIST_ADD_END(conn->sessions, session2); + session2->conn = conn; + + status = smb2_signing_key_sign_create(session2, + conn->smb2.server.sign_algo, + NULL, /* no master key */ + NULL, /* derivations */ + &session2->smb2_channel.signing_key); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(session2); + return NT_STATUS_NO_MEMORY; + } + + memcpy(session2->smb2_channel.preauth_sha512, + conn->smb2.preauth_sha512, + sizeof(session2->smb2_channel.preauth_sha512)); + + *_session2 = session2; + return NT_STATUS_OK; +} + +NTSTATUS smb2cli_session_set_channel_key(struct smbXcli_session *session, + const DATA_BLOB _channel_key, + const struct iovec *recv_iov) +{ + struct smbXcli_conn *conn = session->conn; + uint8_t channel_key[16]; + NTSTATUS status; + struct _derivation { + DATA_BLOB label; + DATA_BLOB context; + }; + struct { + struct _derivation signing; + } derivation = { + .signing.label.length = 0, + }; + + if (conn == NULL) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (smb2_signing_key_valid(session->smb2_channel.signing_key)) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (conn->protocol >= PROTOCOL_SMB3_11) { + struct _derivation *d; + DATA_BLOB p; + + p = data_blob_const(session->smb2_channel.preauth_sha512, + sizeof(session->smb2_channel.preauth_sha512)); + + d = &derivation.signing; + d->label = data_blob_string_const_null("SMBSigningKey"); + d->context = p; + } else if (conn->protocol >= PROTOCOL_SMB3_00) { + struct _derivation *d; + + d = &derivation.signing; + d->label = data_blob_string_const_null("SMB2AESCMAC"); + d->context = data_blob_string_const_null("SmbSign"); + } + + ZERO_STRUCT(channel_key); + memcpy(channel_key, _channel_key.data, + MIN(_channel_key.length, sizeof(channel_key))); + + session->smb2_channel.signing_key->blob = + data_blob_talloc(session->smb2_channel.signing_key, + channel_key, + sizeof(channel_key)); + if (!smb2_signing_key_valid(session->smb2_channel.signing_key)) { + ZERO_STRUCT(channel_key); + return NT_STATUS_NO_MEMORY; + } + + if (conn->protocol >= PROTOCOL_SMB3_00) { + struct _derivation *d = &derivation.signing; + + status = smb2_key_derivation(channel_key, sizeof(channel_key), + d->label.data, d->label.length, + d->context.data, d->context.length, + session->smb2_channel.signing_key->blob.data, + session->smb2_channel.signing_key->blob.length); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + ZERO_STRUCT(channel_key); + + status = smb2_signing_check_pdu(session->smb2_channel.signing_key, + recv_iov, 3); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + return NT_STATUS_OK; +} + +NTSTATUS smb2cli_session_encryption_on(struct smbXcli_session *session) +{ + if (!session->smb2->should_sign) { + /* + * We need required signing on the session + * in order to prevent man in the middle attacks. + */ + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + if (session->smb2->should_encrypt) { + return NT_STATUS_OK; + } + + if (session->conn->protocol < PROTOCOL_SMB3_00) { + return NT_STATUS_NOT_SUPPORTED; + } + + if (session->conn->smb2.server.cipher == 0) { + return NT_STATUS_NOT_SUPPORTED; + } + + if (!smb2_signing_key_valid(session->smb2->signing_key)) { + return NT_STATUS_NOT_SUPPORTED; + } + session->smb2->should_encrypt = true; + return NT_STATUS_OK; +} + +uint16_t smb2cli_session_get_encryption_cipher(struct smbXcli_session *session) +{ + if (session->conn->protocol < PROTOCOL_SMB3_00) { + return 0; + } + + if (!session->smb2->should_encrypt) { + return 0; + } + + return session->conn->smb2.server.cipher; +} + +struct smbXcli_tcon *smbXcli_tcon_create(TALLOC_CTX *mem_ctx) +{ + struct smbXcli_tcon *tcon; + + tcon = talloc_zero(mem_ctx, struct smbXcli_tcon); + if (tcon == NULL) { + return NULL; + } + + return tcon; +} + +/* + * Return a deep structure copy of a struct smbXcli_tcon * + */ + +struct smbXcli_tcon *smbXcli_tcon_copy(TALLOC_CTX *mem_ctx, + const struct smbXcli_tcon *tcon_in) +{ + struct smbXcli_tcon *tcon; + + tcon = talloc_memdup(mem_ctx, tcon_in, sizeof(struct smbXcli_tcon)); + if (tcon == NULL) { + return NULL; + } + + /* Deal with the SMB1 strings. */ + if (tcon_in->smb1.service != NULL) { + tcon->smb1.service = talloc_strdup(tcon, tcon_in->smb1.service); + if (tcon->smb1.service == NULL) { + TALLOC_FREE(tcon); + return NULL; + } + } + if (tcon->smb1.fs_type != NULL) { + tcon->smb1.fs_type = talloc_strdup(tcon, tcon_in->smb1.fs_type); + if (tcon->smb1.fs_type == NULL) { + TALLOC_FREE(tcon); + return NULL; + } + } + return tcon; +} + +void smbXcli_tcon_set_fs_attributes(struct smbXcli_tcon *tcon, + uint32_t fs_attributes) +{ + tcon->fs_attributes = fs_attributes; +} + +uint32_t smbXcli_tcon_get_fs_attributes(struct smbXcli_tcon *tcon) +{ + return tcon->fs_attributes; +} + +bool smbXcli_tcon_is_dfs_share(struct smbXcli_tcon *tcon) +{ + if (tcon == NULL) { + return false; + } + + if (tcon->is_smb1) { + if (tcon->smb1.optional_support & SMB_SHARE_IN_DFS) { + return true; + } + + return false; + } + + if (tcon->smb2.capabilities & SMB2_SHARE_CAP_DFS) { + return true; + } + + return false; +} + +uint16_t smb1cli_tcon_current_id(struct smbXcli_tcon *tcon) +{ + return tcon->smb1.tcon_id; +} + +void smb1cli_tcon_set_id(struct smbXcli_tcon *tcon, uint16_t tcon_id) +{ + tcon->is_smb1 = true; + tcon->smb1.tcon_id = tcon_id; +} + +bool smb1cli_tcon_set_values(struct smbXcli_tcon *tcon, + uint16_t tcon_id, + uint16_t optional_support, + uint32_t maximal_access, + uint32_t guest_maximal_access, + const char *service, + const char *fs_type) +{ + tcon->is_smb1 = true; + tcon->fs_attributes = 0; + tcon->smb1.tcon_id = tcon_id; + tcon->smb1.optional_support = optional_support; + tcon->smb1.maximal_access = maximal_access; + tcon->smb1.guest_maximal_access = guest_maximal_access; + + TALLOC_FREE(tcon->smb1.service); + tcon->smb1.service = talloc_strdup(tcon, service); + if (service != NULL && tcon->smb1.service == NULL) { + return false; + } + + TALLOC_FREE(tcon->smb1.fs_type); + tcon->smb1.fs_type = talloc_strdup(tcon, fs_type); + if (fs_type != NULL && tcon->smb1.fs_type == NULL) { + return false; + } + + return true; +} + +uint32_t smb2cli_tcon_current_id(struct smbXcli_tcon *tcon) +{ + return tcon->smb2.tcon_id; +} + +void smb2cli_tcon_set_id(struct smbXcli_tcon *tcon, uint32_t tcon_id) +{ + tcon->smb2.tcon_id = tcon_id; +} + +uint32_t smb2cli_tcon_capabilities(struct smbXcli_tcon *tcon) +{ + return tcon->smb2.capabilities; +} + +uint32_t smb2cli_tcon_flags(struct smbXcli_tcon *tcon) +{ + return tcon->smb2.flags; +} + +void smb2cli_tcon_set_values(struct smbXcli_tcon *tcon, + struct smbXcli_session *session, + uint32_t tcon_id, + uint8_t type, + uint32_t flags, + uint32_t capabilities, + uint32_t maximal_access) +{ + tcon->is_smb1 = false; + tcon->fs_attributes = 0; + tcon->smb2.tcon_id = tcon_id; + tcon->smb2.type = type; + tcon->smb2.flags = flags; + tcon->smb2.capabilities = capabilities; + tcon->smb2.maximal_access = maximal_access; + + tcon->smb2.should_sign = false; + tcon->smb2.should_encrypt = false; + + if (session == NULL) { + return; + } + + tcon->smb2.should_sign = session->smb2->should_sign; + tcon->smb2.should_encrypt = session->smb2->should_encrypt; + + if (flags & SMB2_SHAREFLAG_ENCRYPT_DATA) { + tcon->smb2.should_encrypt = true; + } +} + +void smb2cli_tcon_should_sign(struct smbXcli_tcon *tcon, + bool should_sign) +{ + tcon->smb2.should_sign = should_sign; +} + +bool smb2cli_tcon_is_signing_on(struct smbXcli_tcon *tcon) +{ + if (tcon->smb2.should_encrypt) { + return true; + } + + return tcon->smb2.should_sign; +} + +void smb2cli_tcon_should_encrypt(struct smbXcli_tcon *tcon, + bool should_encrypt) +{ + tcon->smb2.should_encrypt = should_encrypt; +} + +bool smb2cli_tcon_is_encryption_on(struct smbXcli_tcon *tcon) +{ + return tcon->smb2.should_encrypt; +} + +void smb2cli_conn_set_mid(struct smbXcli_conn *conn, uint64_t mid) +{ + conn->smb2.mid = mid; +} + +uint64_t smb2cli_conn_get_mid(struct smbXcli_conn *conn) +{ + return conn->smb2.mid; +} + +NTSTATUS smb2cli_parse_dyn_buffer(uint32_t dyn_offset, + const DATA_BLOB dyn_buffer, + uint32_t min_offset, + uint32_t buffer_offset, + uint32_t buffer_length, + uint32_t max_length, + uint32_t *next_offset, + DATA_BLOB *buffer) +{ + uint32_t offset; + bool oob; + + *buffer = data_blob_null; + *next_offset = dyn_offset; + + if (buffer_offset == 0) { + /* + * If the offset is 0, we better ignore + * the buffer_length field. + */ + return NT_STATUS_OK; + } + + if (buffer_length == 0) { + /* + * If the length is 0, we better ignore + * the buffer_offset field. + */ + return NT_STATUS_OK; + } + + if ((buffer_offset % 8) != 0) { + /* + * The offset needs to be 8 byte aligned. + */ + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + /* + * We used to enforce buffer_offset to be + * an exact match of the expected minimum, + * but the NetApp Ontap 7.3.7 SMB server + * gets the padding wrong and aligns the + * input_buffer_offset by a value of 8. + * + * So we just enforce that the offset is + * not lower than the expected value. + */ + SMB_ASSERT(min_offset >= dyn_offset); + if (buffer_offset < min_offset) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + /* + * Make [input|output]_buffer_offset relative to "dyn_buffer" + */ + offset = buffer_offset - dyn_offset; + oob = smb_buffer_oob(dyn_buffer.length, offset, buffer_length); + if (oob) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + /* + * Give the caller a hint what we consumed, + * the caller may need to add possible padding. + */ + *next_offset = buffer_offset + buffer_length; + + if (max_length == 0) { + /* + * If max_input_length is 0 we ignore the + * input_buffer_length, because Windows 2008 echos the + * DCERPC request from the requested input_buffer to + * the response input_buffer. + * + * We just use the same logic also for max_output_length... + */ + buffer_length = 0; + } + + if (buffer_length > max_length) { + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + *buffer = (DATA_BLOB) { + .data = dyn_buffer.data + offset, + .length = buffer_length, + }; + return NT_STATUS_OK; +} |