summaryrefslogtreecommitdiffstats
path: root/auth/ntlmssp/ntlmssp_server.c
diff options
context:
space:
mode:
Diffstat (limited to 'auth/ntlmssp/ntlmssp_server.c')
-rw-r--r--auth/ntlmssp/ntlmssp_server.c1160
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;
+}