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Diffstat (limited to '')
| -rw-r--r-- | auth/ntlmssp/ntlmssp_server.c | 1160 |
1 files changed, 1160 insertions, 0 deletions
diff --git a/auth/ntlmssp/ntlmssp_server.c b/auth/ntlmssp/ntlmssp_server.c new file mode 100644 index 0000000..6a27db1 --- /dev/null +++ b/auth/ntlmssp/ntlmssp_server.c @@ -0,0 +1,1160 @@ +/* + Unix SMB/Netbios implementation. + Version 3.0 + handle NTLMSSP, server side + + Copyright (C) Andrew Tridgell 2001 + Copyright (C) Andrew Bartlett 2001-2010 + + 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 <tevent.h> +#include "lib/util/tevent_ntstatus.h" +#include "lib/util/time_basic.h" +#include "auth/ntlmssp/ntlmssp.h" +#include "auth/ntlmssp/ntlmssp_private.h" +#include "../librpc/gen_ndr/ndr_ntlmssp.h" +#include "auth/ntlmssp/ntlmssp_ndr.h" +#include "../libcli/auth/libcli_auth.h" +#include "auth/gensec/gensec.h" +#include "auth/gensec/gensec_internal.h" +#include "auth/common_auth.h" +#include "param/param.h" +#include "param/loadparm.h" +#include "libcli/security/session.h" + +#include "lib/crypto/gnutls_helpers.h" +#include <gnutls/gnutls.h> +#include <gnutls/crypto.h> + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_AUTH + +/** + * Determine correct target name flags for reply, given server role + * and negotiated flags + * + * @param ntlmssp_state NTLMSSP State + * @param neg_flags The flags from the packet + * @param chal_flags The flags to be set in the reply packet + * @return The 'target name' string. + */ + +const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state, + uint32_t neg_flags, uint32_t *chal_flags) +{ + if (neg_flags & NTLMSSP_REQUEST_TARGET) { + *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO; + *chal_flags |= NTLMSSP_REQUEST_TARGET; + if (ntlmssp_state->server.is_standalone) { + *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER; + return ntlmssp_state->server.netbios_name; + } else { + *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN; + return ntlmssp_state->server.netbios_domain; + }; + } else { + return ""; + } +} + +/** + * Next state function for the NTLMSSP Negotiate packet + * + * @param gensec_security GENSEC state + * @param out_mem_ctx Memory context for *out + * @param in The request, as a DATA_BLOB. reply.data must be NULL + * @param out The reply, as an allocated DATA_BLOB, caller to free. + * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required. + */ + +NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security, + TALLOC_CTX *out_mem_ctx, + const DATA_BLOB request, DATA_BLOB *reply) +{ + struct gensec_ntlmssp_context *gensec_ntlmssp = + talloc_get_type_abort(gensec_security->private_data, + struct gensec_ntlmssp_context); + struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state; + struct auth4_context *auth_context = gensec_security->auth_context; + DATA_BLOB struct_blob; + uint32_t neg_flags = 0; + uint32_t ntlmssp_command, chal_flags; + uint8_t cryptkey[8]; + const char *target_name; + NTSTATUS status; + struct timeval tv_now = timeval_current(); + /* + * See [MS-NLMP] + * + * Windows NT 4.0, windows_2000: use 30 minutes, + * Windows XP, Windows Server 2003, Windows Vista, + * Windows Server 2008, Windows 7, and Windows Server 2008 R2 + * use 36 hours. + * + * Newer systems doesn't check this, likely because the + * connectionless NTLMSSP is no longer supported. + * + * As we expect the AUTHENTICATION_MESSAGE to arrive + * directly after the NEGOTIATE_MESSAGE (typically less than + * as 1 second later). We use a hard timeout of 30 Minutes. + * + * We don't look at AUTHENTICATE_MESSAGE.NtChallengeResponse.TimeStamp + * instead we just remember our own time. + */ + uint32_t max_lifetime = 30 * 60; + struct timeval tv_end = timeval_add(&tv_now, max_lifetime, 0); + + /* parse the NTLMSSP packet */ +#if 0 + file_save("ntlmssp_negotiate.dat", request.data, request.length); +#endif + + if (request.length) { + if (request.length > UINT16_MAX) { + DEBUG(1, ("ntlmssp_server_negotiate: reject large request of length %u\n", + (unsigned int)request.length)); + return NT_STATUS_INVALID_PARAMETER; + } + + if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd", + "NTLMSSP", + &ntlmssp_command, + &neg_flags)) { + DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n", + (unsigned int)request.length)); + dump_data(2, request.data, request.length); + return NT_STATUS_INVALID_PARAMETER; + } + debug_ntlmssp_flags(neg_flags); + + if (DEBUGLEVEL >= 10) { + struct NEGOTIATE_MESSAGE *negotiate = talloc( + ntlmssp_state, struct NEGOTIATE_MESSAGE); + if (negotiate != NULL) { + status = ntlmssp_pull_NEGOTIATE_MESSAGE( + &request, negotiate, negotiate); + if (NT_STATUS_IS_OK(status)) { + NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, + negotiate); + } + TALLOC_FREE(negotiate); + } + } + } + + status = ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, "negotiate"); + if (!NT_STATUS_IS_OK(status)){ + return status; + } + + /* Ask our caller what challenge they would like in the packet */ + if (auth_context->get_ntlm_challenge) { + status = auth_context->get_ntlm_challenge(auth_context, cryptkey); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n", + nt_errstr(status))); + return status; + } + } else { + DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't give a challenge\n")); + return NT_STATUS_NOT_IMPLEMENTED; + } + + /* The flags we send back are not just the negotiated flags, + * they are also 'what is in this packet'. Therfore, we + * operate on 'chal_flags' from here on + */ + + chal_flags = ntlmssp_state->neg_flags; + ntlmssp_state->server.challenge_endtime = timeval_to_nttime(&tv_end); + + /* get the right name to fill in as 'target' */ + target_name = ntlmssp_target_name(ntlmssp_state, + neg_flags, &chal_flags); + if (target_name == NULL) + return NT_STATUS_INVALID_PARAMETER; + + ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8); + ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state, + cryptkey, 8); + + /* This creates the 'blob' of names that appears at the end of the packet */ + if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) { + enum ndr_err_code err; + struct AV_PAIR *pairs = NULL; + uint32_t count = 5; + + pairs = talloc_zero_array(ntlmssp_state, struct AV_PAIR, count + 1); + if (pairs == NULL) { + return NT_STATUS_NO_MEMORY; + } + + pairs[0].AvId = MsvAvNbDomainName; + pairs[0].Value.AvNbDomainName = target_name; + + pairs[1].AvId = MsvAvNbComputerName; + pairs[1].Value.AvNbComputerName = ntlmssp_state->server.netbios_name; + + pairs[2].AvId = MsvAvDnsDomainName; + pairs[2].Value.AvDnsDomainName = ntlmssp_state->server.dns_domain; + + pairs[3].AvId = MsvAvDnsComputerName; + pairs[3].Value.AvDnsComputerName= ntlmssp_state->server.dns_name; + + if (!ntlmssp_state->force_old_spnego) { + pairs[4].AvId = MsvAvTimestamp; + pairs[4].Value.AvTimestamp = + timeval_to_nttime(&tv_now); + count += 1; + + pairs[5].AvId = MsvAvEOL; + } else { + pairs[4].AvId = MsvAvEOL; + } + + ntlmssp_state->server.av_pair_list.count = count; + ntlmssp_state->server.av_pair_list.pair = pairs; + + err = ndr_push_struct_blob(&struct_blob, + ntlmssp_state, + &ntlmssp_state->server.av_pair_list, + (ndr_push_flags_fn_t)ndr_push_AV_PAIR_LIST); + if (!NDR_ERR_CODE_IS_SUCCESS(err)) { + return NT_STATUS_NO_MEMORY; + } + } else { + struct_blob = data_blob_null; + } + + { + /* Marshal the packet in the right format, be it unicode or ASCII */ + const char *gen_string; + const DATA_BLOB version_blob = ntlmssp_version_blob(); + + if (ntlmssp_state->unicode) { + gen_string = "CdUdbddBb"; + } else { + gen_string = "CdAdbddBb"; + } + + status = msrpc_gen(out_mem_ctx, reply, gen_string, + "NTLMSSP", + NTLMSSP_CHALLENGE, + target_name, + chal_flags, + cryptkey, 8, + 0, 0, + struct_blob.data, struct_blob.length, + version_blob.data, version_blob.length); + + if (!NT_STATUS_IS_OK(status)) { + data_blob_free(&struct_blob); + return status; + } + + if (DEBUGLEVEL >= 10) { + struct CHALLENGE_MESSAGE *challenge = talloc( + ntlmssp_state, struct CHALLENGE_MESSAGE); + if (challenge != NULL) { + challenge->NegotiateFlags = chal_flags; + status = ntlmssp_pull_CHALLENGE_MESSAGE( + reply, challenge, challenge); + if (NT_STATUS_IS_OK(status)) { + NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, + challenge); + } + TALLOC_FREE(challenge); + } + } + } + + data_blob_free(&struct_blob); + + ntlmssp_state->negotiate_blob = data_blob_dup_talloc(ntlmssp_state, + request); + if (ntlmssp_state->negotiate_blob.length != request.length) { + return NT_STATUS_NO_MEMORY; + } + + ntlmssp_state->challenge_blob = data_blob_dup_talloc(ntlmssp_state, + *reply); + if (ntlmssp_state->challenge_blob.length != reply->length) { + return NT_STATUS_NO_MEMORY; + } + + ntlmssp_state->expected_state = NTLMSSP_AUTH; + + return NT_STATUS_MORE_PROCESSING_REQUIRED; +} + +struct ntlmssp_server_auth_state { + struct gensec_security *gensec_security; + struct gensec_ntlmssp_context *gensec_ntlmssp; + DATA_BLOB in; + struct auth_usersupplied_info *user_info; + DATA_BLOB user_session_key; + DATA_BLOB lm_session_key; + /* internal variables used by KEY_EXCH (client-supplied user session key */ + DATA_BLOB encrypted_session_key; + bool doing_ntlm2; + /* internal variables used by NTLM2 */ + uint8_t session_nonce[16]; +}; + +static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security, + struct gensec_ntlmssp_context *gensec_ntlmssp, + struct ntlmssp_server_auth_state *state, + const DATA_BLOB request); +static void ntlmssp_server_auth_done(struct tevent_req *subreq); +static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security, + struct gensec_ntlmssp_context *gensec_ntlmssp, + struct ntlmssp_server_auth_state *state, + DATA_BLOB request); + +struct tevent_req *ntlmssp_server_auth_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct gensec_security *gensec_security, + const DATA_BLOB in) +{ + struct gensec_ntlmssp_context *gensec_ntlmssp = + talloc_get_type_abort(gensec_security->private_data, + struct gensec_ntlmssp_context); + struct auth4_context *auth_context = gensec_security->auth_context; + struct tevent_req *req = NULL; + struct tevent_req *subreq = NULL; + struct ntlmssp_server_auth_state *state = NULL; + NTSTATUS status; + + req = tevent_req_create(mem_ctx, &state, + struct ntlmssp_server_auth_state); + if (req == NULL) { + return NULL; + } + state->gensec_security = gensec_security; + state->gensec_ntlmssp = gensec_ntlmssp; + state->in = in; + + status = ntlmssp_server_preauth(gensec_security, + gensec_ntlmssp, + state, in); + if (tevent_req_nterror(req, status)) { + return tevent_req_post(req, ev); + } + + subreq = auth_context->check_ntlm_password_send( + state, ev, auth_context, state->user_info); + if (tevent_req_nomem(subreq, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback(subreq, ntlmssp_server_auth_done, req); + return req; +} + +/** + * Next state function for the Authenticate packet + * + * @param ntlmssp_state NTLMSSP State + * @param request The request, as a DATA_BLOB + * @return Errors or NT_STATUS_OK. + */ + +static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security, + struct gensec_ntlmssp_context *gensec_ntlmssp, + struct ntlmssp_server_auth_state *state, + const DATA_BLOB request) +{ + struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state; + struct auth4_context *auth_context = gensec_security->auth_context; + struct auth_usersupplied_info *user_info = NULL; + uint32_t ntlmssp_command, auth_flags; + NTSTATUS nt_status; + const unsigned int version_len = 8; + DATA_BLOB version_blob = data_blob_null; + const unsigned int mic_len = NTLMSSP_MIC_SIZE; + DATA_BLOB mic_blob = data_blob_null; + const char *parse_string; + bool ok; + struct timeval endtime; + bool expired = false; + +#if 0 + file_save("ntlmssp_auth.dat", request.data, request.length); +#endif + + if (ntlmssp_state->unicode) { + parse_string = "CdBBUUUBdbb"; + } else { + parse_string = "CdBBAAABdbb"; + } + + /* zero these out */ + data_blob_free(&ntlmssp_state->session_key); + data_blob_free(&ntlmssp_state->lm_resp); + data_blob_free(&ntlmssp_state->nt_resp); + + ntlmssp_state->user = NULL; + ntlmssp_state->domain = NULL; + ntlmssp_state->client.netbios_name = NULL; + + /* now the NTLMSSP encoded auth hashes */ + ok = msrpc_parse(ntlmssp_state, &request, parse_string, + "NTLMSSP", + &ntlmssp_command, + &ntlmssp_state->lm_resp, + &ntlmssp_state->nt_resp, + &ntlmssp_state->domain, + &ntlmssp_state->user, + &ntlmssp_state->client.netbios_name, + &state->encrypted_session_key, + &auth_flags, + &version_blob, version_len, + &mic_blob, mic_len); + if (!ok) { + DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n")); + dump_data(10, request.data, request.length); + + data_blob_free(&version_blob); + data_blob_free(&mic_blob); + + if (ntlmssp_state->unicode) { + parse_string = "CdBBUUUBd"; + } else { + parse_string = "CdBBAAABd"; + } + + ok = msrpc_parse(ntlmssp_state, &request, parse_string, + "NTLMSSP", + &ntlmssp_command, + &ntlmssp_state->lm_resp, + &ntlmssp_state->nt_resp, + &ntlmssp_state->domain, + &ntlmssp_state->user, + &ntlmssp_state->client.netbios_name, + &state->encrypted_session_key, + &auth_flags); + } + + if (!ok) { + DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n")); + dump_data(10, request.data, request.length); + + /* zero this out */ + data_blob_free(&state->encrypted_session_key); + auth_flags = 0; + + /* Try again with a shorter string (Win9X truncates this packet) */ + if (ntlmssp_state->unicode) { + parse_string = "CdBBUUU"; + } else { + parse_string = "CdBBAAA"; + } + + /* now the NTLMSSP encoded auth hashes */ + if (!msrpc_parse(ntlmssp_state, &request, parse_string, + "NTLMSSP", + &ntlmssp_command, + &ntlmssp_state->lm_resp, + &ntlmssp_state->nt_resp, + &ntlmssp_state->domain, + &ntlmssp_state->user, + &ntlmssp_state->client.netbios_name)) { + DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n")); + dump_data(2, request.data, request.length); + + return NT_STATUS_INVALID_PARAMETER; + } + } + + talloc_steal(state, state->encrypted_session_key.data); + + if (auth_flags != 0) { + nt_status = ntlmssp_handle_neg_flags(ntlmssp_state, + auth_flags, + "authenticate"); + if (!NT_STATUS_IS_OK(nt_status)){ + return nt_status; + } + } + + if (DEBUGLEVEL >= 10) { + struct AUTHENTICATE_MESSAGE *authenticate = talloc( + ntlmssp_state, struct AUTHENTICATE_MESSAGE); + if (authenticate != NULL) { + NTSTATUS status; + authenticate->NegotiateFlags = auth_flags; + status = ntlmssp_pull_AUTHENTICATE_MESSAGE( + &request, authenticate, authenticate); + if (NT_STATUS_IS_OK(status)) { + NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, + authenticate); + } + TALLOC_FREE(authenticate); + } + } + + DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n", + ntlmssp_state->user, ntlmssp_state->domain, + ntlmssp_state->client.netbios_name, + (unsigned long)ntlmssp_state->lm_resp.length, + (unsigned long)ntlmssp_state->nt_resp.length)); + +#if 0 + file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length); + file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length); +#endif + + if (ntlmssp_state->nt_resp.length > 24) { + struct NTLMv2_RESPONSE v2_resp; + enum ndr_err_code err; + uint32_t i = 0; + uint32_t count = 0; + const struct AV_PAIR *flags = NULL; + const struct AV_PAIR *eol = NULL; + uint32_t av_flags = 0; + + err = ndr_pull_struct_blob(&ntlmssp_state->nt_resp, + ntlmssp_state, + &v2_resp, + (ndr_pull_flags_fn_t)ndr_pull_NTLMv2_RESPONSE); + if (!NDR_ERR_CODE_IS_SUCCESS(err)) { + nt_status = ndr_map_error2ntstatus(err); + if (NT_STATUS_EQUAL(nt_status, NT_STATUS_BUFFER_TOO_SMALL)) { + /* + * Note that invalid blobs should result in + * INVALID_PARAMETER, as demonstrated by + * smb2.session.ntlmssp_bug14932 + */ + nt_status = NT_STATUS_INVALID_PARAMETER; + } + DEBUG(1,("%s: failed to parse NTLMv2_RESPONSE of length %zu for " + "user=[%s] domain=[%s] workstation=[%s] - %s %s\n", + __func__, ntlmssp_state->nt_resp.length, + ntlmssp_state->user, ntlmssp_state->domain, + ntlmssp_state->client.netbios_name, + ndr_errstr(err), nt_errstr(nt_status))); + return nt_status; + } + + if (DEBUGLVL(10)) { + NDR_PRINT_DEBUG(NTLMv2_RESPONSE, &v2_resp); + } + + eol = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs, + MsvAvEOL); + if (eol == NULL) { + DEBUG(1,("%s: missing MsvAvEOL for " + "user=[%s] domain=[%s] workstation=[%s]\n", + __func__, ntlmssp_state->user, ntlmssp_state->domain, + ntlmssp_state->client.netbios_name)); + return NT_STATUS_INVALID_PARAMETER; + } + + flags = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs, + MsvAvFlags); + if (flags != NULL) { + av_flags = flags->Value.AvFlags; + } + + if (av_flags & NTLMSSP_AVFLAG_MIC_IN_AUTHENTICATE_MESSAGE) { + if (mic_blob.length != NTLMSSP_MIC_SIZE) { + DEBUG(1,("%s: mic_blob.length[%u] for " + "user=[%s] domain=[%s] workstation=[%s]\n", + __func__, + (unsigned)mic_blob.length, + ntlmssp_state->user, + ntlmssp_state->domain, + ntlmssp_state->client.netbios_name)); + return NT_STATUS_INVALID_PARAMETER; + } + + if (request.length < + (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE)) + { + DEBUG(1,("%s: missing MIC " + "request.length[%u] for " + "user=[%s] domain=[%s] workstation=[%s]\n", + __func__, + (unsigned)request.length, + ntlmssp_state->user, + ntlmssp_state->domain, + ntlmssp_state->client.netbios_name)); + return NT_STATUS_INVALID_PARAMETER; + } + + ntlmssp_state->new_spnego = true; + } + + count = ntlmssp_state->server.av_pair_list.count; + if (v2_resp.Challenge.AvPairs.count < count) { + return NT_STATUS_INVALID_PARAMETER; + } + + for (i = 0; i < count; i++) { + const struct AV_PAIR *sp = + &ntlmssp_state->server.av_pair_list.pair[i]; + const struct AV_PAIR *cp = NULL; + + if (sp->AvId == MsvAvEOL) { + continue; + } + + cp = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs, + sp->AvId); + if (cp == NULL) { + DEBUG(1,("%s: AvId 0x%x missing for" + "user=[%s] domain=[%s] " + "workstation=[%s]\n", + __func__, + (unsigned)sp->AvId, + ntlmssp_state->user, + ntlmssp_state->domain, + ntlmssp_state->client.netbios_name)); + return NT_STATUS_INVALID_PARAMETER; + } + + switch (cp->AvId) { +#define CASE_STRING(v) case Msv ## v: do { \ + int cmp; \ + if (sp->Value.v == NULL) { \ + return NT_STATUS_INTERNAL_ERROR; \ + } \ + if (cp->Value.v == NULL) { \ + DEBUG(1,("%s: invalid %s " \ + "got[%s] expect[%s] for " \ + "user=[%s] domain=[%s] workstation=[%s]\n", \ + __func__, #v, \ + cp->Value.v, \ + sp->Value.v, \ + ntlmssp_state->user, \ + ntlmssp_state->domain, \ + ntlmssp_state->client.netbios_name)); \ + return NT_STATUS_INVALID_PARAMETER; \ + } \ + cmp = strcmp(cp->Value.v, sp->Value.v); \ + if (cmp != 0) { \ + DEBUG(1,("%s: invalid %s " \ + "got[%s] expect[%s] for " \ + "user=[%s] domain=[%s] workstation=[%s]\n", \ + __func__, #v, \ + cp->Value.v, \ + sp->Value.v, \ + ntlmssp_state->user, \ + ntlmssp_state->domain, \ + ntlmssp_state->client.netbios_name)); \ + return NT_STATUS_INVALID_PARAMETER; \ + } \ +} while(0); break + CASE_STRING(AvNbComputerName); + CASE_STRING(AvNbDomainName); + CASE_STRING(AvDnsComputerName); + CASE_STRING(AvDnsDomainName); + CASE_STRING(AvDnsTreeName); + case MsvAvTimestamp: + if (cp->Value.AvTimestamp != sp->Value.AvTimestamp) { + struct timeval ct; + struct timeval st; + struct timeval_buf tmp1; + struct timeval_buf tmp2; + + nttime_to_timeval(&ct, + cp->Value.AvTimestamp); + nttime_to_timeval(&st, + sp->Value.AvTimestamp); + + DEBUG(1,("%s: invalid AvTimestamp " + "got[%s] expect[%s] for " + "user=[%s] domain=[%s] " + "workstation=[%s]\n", + __func__, + timeval_str_buf(&ct, false, + true, &tmp1), + timeval_str_buf(&st, false, + true, &tmp2), + ntlmssp_state->user, + ntlmssp_state->domain, + ntlmssp_state->client.netbios_name)); + return NT_STATUS_INVALID_PARAMETER; + } + break; + default: + /* + * This can't happen as we control + * ntlmssp_state->server.av_pair_list + */ + return NT_STATUS_INTERNAL_ERROR; + } + } + } + + nttime_to_timeval(&endtime, ntlmssp_state->server.challenge_endtime); + expired = timeval_expired(&endtime); + if (expired) { + struct timeval_buf tmp; + DEBUG(1,("%s: challenge invalid (expired %s) for " + "user=[%s] domain=[%s] workstation=[%s]\n", + __func__, + timeval_str_buf(&endtime, false, true, &tmp), + ntlmssp_state->user, ntlmssp_state->domain, + ntlmssp_state->client.netbios_name)); + return NT_STATUS_INVALID_PARAMETER; + } + + /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a + client challenge + + However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful. + */ + if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) { + if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) { + state->doing_ntlm2 = true; + + memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8); + memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8); + + SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8); + + /* LM response is no longer useful */ + data_blob_free(&ntlmssp_state->lm_resp); + + /* We changed the effective challenge - set it */ + if (auth_context->set_ntlm_challenge) { + uint8_t session_nonce_hash[16]; + int rc; + + rc = gnutls_hash_fast(GNUTLS_DIG_MD5, + state->session_nonce, + 16, + session_nonce_hash); + if (rc < 0) { + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + + + nt_status = auth_context->set_ntlm_challenge(auth_context, + session_nonce_hash, + "NTLMSSP callback (NTLM2)"); + ZERO_ARRAY(session_nonce_hash); + if (!NT_STATUS_IS_OK(nt_status)) { + DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n", + nt_errstr(nt_status))); + return nt_status; + } + } else { + DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't have facility for challenge to be set\n")); + + return NT_STATUS_NOT_IMPLEMENTED; + } + + /* LM Key is incompatible. */ + ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + } + } + + user_info = talloc_zero(state, struct auth_usersupplied_info); + if (!user_info) { + return NT_STATUS_NO_MEMORY; + } + + user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT; + user_info->flags = 0; + user_info->client.account_name = ntlmssp_state->user; + user_info->client.domain_name = ntlmssp_state->domain; + user_info->workstation_name = ntlmssp_state->client.netbios_name; + user_info->remote_host = gensec_get_remote_address(gensec_security); + user_info->local_host = gensec_get_local_address(gensec_security); + user_info->service_description + = gensec_get_target_service_description(gensec_security); + + /* + * This will just be the string "NTLMSSP" from + * gensec_ntlmssp_final_auth_type, but ensures it stays in sync + * with the same use in the authorization logging triggered by + * gensec_session_info() later + */ + user_info->auth_description = gensec_final_auth_type(gensec_security); + + user_info->password_state = AUTH_PASSWORD_RESPONSE; + user_info->password.response.lanman = ntlmssp_state->lm_resp; + user_info->password.response.nt = ntlmssp_state->nt_resp; + + state->user_info = user_info; + return NT_STATUS_OK; +} + +static void ntlmssp_server_auth_done(struct tevent_req *subreq) +{ + struct tevent_req *req = + tevent_req_callback_data(subreq, + struct tevent_req); + struct ntlmssp_server_auth_state *state = + tevent_req_data(req, + struct ntlmssp_server_auth_state); + struct gensec_security *gensec_security = state->gensec_security; + struct gensec_ntlmssp_context *gensec_ntlmssp = state->gensec_ntlmssp; + struct auth4_context *auth_context = gensec_security->auth_context; + uint8_t authoritative = 1; + NTSTATUS status; + + status = auth_context->check_ntlm_password_recv(subreq, + gensec_ntlmssp, + &authoritative, + &gensec_ntlmssp->server_returned_info, + &state->user_session_key, + &state->lm_session_key); + TALLOC_FREE(subreq); + if (!NT_STATUS_IS_OK(status)) { + DBG_INFO("Checking NTLMSSP password for %s\\%s failed: %s\n", + state->user_info->client.domain_name, + state->user_info->client.account_name, + nt_errstr(status)); + } + if (tevent_req_nterror(req, status)) { + return; + } + talloc_steal(state, state->user_session_key.data); + talloc_steal(state, state->lm_session_key.data); + + status = ntlmssp_server_postauth(state->gensec_security, + state->gensec_ntlmssp, + state, state->in); + if (tevent_req_nterror(req, status)) { + return; + } + + tevent_req_done(req); +} + +/** + * Next state function for the Authenticate packet + * (after authentication - figures out the session keys etc) + * + * @param ntlmssp_state NTLMSSP State + * @return Errors or NT_STATUS_OK. + */ + +static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security, + struct gensec_ntlmssp_context *gensec_ntlmssp, + struct ntlmssp_server_auth_state *state, + DATA_BLOB request) +{ + struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state; + struct auth4_context *auth_context = gensec_security->auth_context; + DATA_BLOB user_session_key = state->user_session_key; + DATA_BLOB lm_session_key = state->lm_session_key; + NTSTATUS nt_status = NT_STATUS_OK; + DATA_BLOB session_key = data_blob(NULL, 0); + struct auth_session_info *session_info = NULL; + + TALLOC_FREE(state->user_info); + + if (lpcfg_map_to_guest(gensec_security->settings->lp_ctx) != NEVER_MAP_TO_GUEST + && auth_context->generate_session_info != NULL) + { + NTSTATUS tmp_status; + + /* + * We need to check if the auth is anonymous or mapped to guest + */ + tmp_status = auth_context->generate_session_info(auth_context, state, + gensec_ntlmssp->server_returned_info, + gensec_ntlmssp->ntlmssp_state->user, + AUTH_SESSION_INFO_SIMPLE_PRIVILEGES, + &session_info); + if (!NT_STATUS_IS_OK(tmp_status)) { + /* + * We don't care about failures, + * the worst result is that we try MIC checking + * for a map to guest authentication. + */ + TALLOC_FREE(session_info); + } + } + + if (session_info != NULL) { + if (security_session_user_level(session_info, NULL) < SECURITY_USER) { + /* + * Anonymous and GUEST are not secure anyway. + * avoid new_spnego and MIC checking. + */ + ntlmssp_state->new_spnego = false; + ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN; + ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL; + } + TALLOC_FREE(session_info); + } + + dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length); + dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length); + + /* Handle the different session key derivation for NTLM2 */ + if (state->doing_ntlm2) { + if (user_session_key.data && user_session_key.length == 16) { + int rc; + + session_key = data_blob_talloc(ntlmssp_state, + NULL, 16); + + rc = gnutls_hmac_fast(GNUTLS_MAC_MD5, + user_session_key.data, + user_session_key.length, + state->session_nonce, + sizeof(state->session_nonce), + session_key.data); + if (rc < 0) { + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + + DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n")); + dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length); + + } else { + DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n")); + session_key = data_blob_null; + } + } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) + /* Ensure we can never get here on NTLMv2 */ + && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) { + + if (lm_session_key.data && lm_session_key.length >= 8) { + if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) { + session_key = data_blob_talloc(ntlmssp_state, + NULL, 16); + if (session_key.data == NULL) { + return NT_STATUS_NO_MEMORY; + } + nt_status = SMBsesskeygen_lm_sess_key(lm_session_key.data, + ntlmssp_state->lm_resp.data, + session_key.data); + if (!NT_STATUS_IS_OK(nt_status)) { + return nt_status; + } + DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n")); + } else { + static const uint8_t zeros[24] = {0, }; + session_key = data_blob_talloc( + ntlmssp_state, NULL, 16); + if (session_key.data == NULL) { + return NT_STATUS_NO_MEMORY; + } + nt_status = SMBsesskeygen_lm_sess_key(zeros, zeros, + session_key.data); + if (!NT_STATUS_IS_OK(nt_status)) { + return nt_status; + } + DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n")); + } + dump_data_pw("LM session key:\n", session_key.data, + session_key.length); + } else { + /* LM Key not selected */ + ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + + DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n")); + session_key = data_blob_null; + } + + } else if (user_session_key.data) { + session_key = user_session_key; + DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n")); + dump_data_pw("unmodified session key:\n", session_key.data, session_key.length); + + /* LM Key not selected */ + ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + + } else if (lm_session_key.data) { + /* Very weird to have LM key, but no user session key, but anyway.. */ + session_key = lm_session_key; + DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n")); + dump_data_pw("unmodified session key:\n", session_key.data, session_key.length); + + /* LM Key not selected */ + ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + + } else { + DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n")); + session_key = data_blob_null; + + /* LM Key not selected */ + ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + } + + /* With KEY_EXCH, the client supplies the proposed session key, + but encrypts it with the long-term key */ + if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) { + if (!state->encrypted_session_key.data + || state->encrypted_session_key.length != 16) { + DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n", + (unsigned)state->encrypted_session_key.length)); + return NT_STATUS_INVALID_PARAMETER; + } else if (!session_key.data || session_key.length != 16) { + DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n", + (unsigned int)session_key.length)); + ntlmssp_state->session_key = session_key; + talloc_steal(ntlmssp_state, session_key.data); + } else { + gnutls_cipher_hd_t cipher_hnd; + gnutls_datum_t enc_session_key = { + .data = session_key.data, + .size = session_key.length, + }; + int rc; + + dump_data_pw("KEY_EXCH session key (enc):\n", + state->encrypted_session_key.data, + state->encrypted_session_key.length); + + rc = gnutls_cipher_init(&cipher_hnd, + GNUTLS_CIPHER_ARCFOUR_128, + &enc_session_key, + NULL); + if (rc < 0) { + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + rc = gnutls_cipher_encrypt(cipher_hnd, + state->encrypted_session_key.data, + state->encrypted_session_key.length); + gnutls_cipher_deinit(cipher_hnd); + if (rc < 0) { + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + + ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state, + state->encrypted_session_key.data, + state->encrypted_session_key.length); + dump_data_pw("KEY_EXCH session key:\n", + state->encrypted_session_key.data, + state->encrypted_session_key.length); + } + } else { + ntlmssp_state->session_key = session_key; + talloc_steal(ntlmssp_state, session_key.data); + } + + if (ntlmssp_state->new_spnego) { + gnutls_hmac_hd_t hmac_hnd = NULL; + uint8_t mic_buffer[NTLMSSP_MIC_SIZE] = { 0, }; + bool cmp; + int rc; + + rc = gnutls_hmac_init(&hmac_hnd, + GNUTLS_MAC_MD5, + ntlmssp_state->session_key.data, + MIN(ntlmssp_state->session_key.length, 64)); + if (rc < 0) { + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + rc = gnutls_hmac(hmac_hnd, + ntlmssp_state->negotiate_blob.data, + ntlmssp_state->negotiate_blob.length); + if (rc < 0) { + gnutls_hmac_deinit(hmac_hnd, NULL); + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + rc = gnutls_hmac(hmac_hnd, + ntlmssp_state->challenge_blob.data, + ntlmssp_state->challenge_blob.length); + if (rc < 0) { + gnutls_hmac_deinit(hmac_hnd, NULL); + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + + /* checked were we set ntlmssp_state->new_spnego */ + SMB_ASSERT(request.length > + (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE)); + + rc = gnutls_hmac(hmac_hnd, request.data, NTLMSSP_MIC_OFFSET); + if (rc < 0) { + gnutls_hmac_deinit(hmac_hnd, NULL); + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + rc = gnutls_hmac(hmac_hnd, mic_buffer, NTLMSSP_MIC_SIZE); + if (rc < 0) { + gnutls_hmac_deinit(hmac_hnd, NULL); + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + rc = gnutls_hmac(hmac_hnd, + request.data + (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE), + request.length - (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE)); + if (rc < 0) { + gnutls_hmac_deinit(hmac_hnd, NULL); + return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED); + } + gnutls_hmac_deinit(hmac_hnd, mic_buffer); + + cmp = mem_equal_const_time(request.data + NTLMSSP_MIC_OFFSET, + mic_buffer, NTLMSSP_MIC_SIZE); + if (!cmp) { + DEBUG(1,("%s: invalid NTLMSSP_MIC for " + "user=[%s] domain=[%s] workstation=[%s]\n", + __func__, + ntlmssp_state->user, + ntlmssp_state->domain, + ntlmssp_state->client.netbios_name)); + dump_data(11, request.data + NTLMSSP_MIC_OFFSET, + NTLMSSP_MIC_SIZE); + dump_data(11, mic_buffer, + NTLMSSP_MIC_SIZE); + } + + ZERO_ARRAY(mic_buffer); + + if (!cmp) { + return NT_STATUS_INVALID_PARAMETER; + } + } + + data_blob_free(&ntlmssp_state->negotiate_blob); + data_blob_free(&ntlmssp_state->challenge_blob); + + if (gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) { + if (gensec_security->want_features & GENSEC_FEATURE_LDAP_STYLE) { + /* + * We need to handle NTLMSSP_NEGOTIATE_SIGN as + * NTLMSSP_NEGOTIATE_SEAL if GENSEC_FEATURE_LDAP_STYLE + * is requested. + */ + ntlmssp_state->force_wrap_seal = true; + } + nt_status = ntlmssp_sign_init(ntlmssp_state); + } + + data_blob_clear_free(&ntlmssp_state->internal_chal); + data_blob_clear_free(&ntlmssp_state->chal); + data_blob_clear_free(&ntlmssp_state->lm_resp); + data_blob_clear_free(&ntlmssp_state->nt_resp); + + ntlmssp_state->expected_state = NTLMSSP_DONE; + + return nt_status; +} + +NTSTATUS ntlmssp_server_auth_recv(struct tevent_req *req, + TALLOC_CTX *out_mem_ctx, + DATA_BLOB *out) +{ + NTSTATUS status; + + *out = data_blob_null; + + if (tevent_req_is_nterror(req, &status)) { + tevent_req_received(req); + return status; + } + + tevent_req_received(req); + return NT_STATUS_OK; +} |