auth/ntlmssp/ntlmssp_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NTLMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2010
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include <tevent.h>
  25 #include "lib/util/tevent_ntstatus.h"
  26 #include "lib/util/time_basic.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "auth/ntlmssp/ntlmssp_private.h"
  29 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  30 #include "auth/ntlmssp/ntlmssp_ndr.h"
  31 #include "../libcli/auth/libcli_auth.h"
  32 #include "../lib/crypto/crypto.h"
  33 #include "auth/gensec/gensec.h"
  34 #include "auth/gensec/gensec_internal.h"
  35 #include "auth/common_auth.h"
  36 #include "param/param.h"
  37 #include "param/loadparm.h"
  38 #include "libcli/security/session.h"
  39
  40 /**
  41  * Determine correct target name flags for reply, given server role
  42  * and negotiated flags
  43  *
  44  * @param ntlmssp_state NTLMSSP State
  45  * @param neg_flags The flags from the packet
  46  * @param chal_flags The flags to be set in the reply packet
  47  * @return The 'target name' string.
  48  */
  49
  50 const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
  51                                 uint32_t neg_flags, uint32_t *chal_flags)
  52 {
  53         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  54                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
  55                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  56                 if (ntlmssp_state->server.is_standalone) {
  57                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  58                         return ntlmssp_state->server.netbios_name;
  59                 } else {
  60                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
  61                         return ntlmssp_state->server.netbios_domain;
  62                 };
  63         } else {
  64                 return "";
  65         }
  66 }
  67
  68 /**
  69  * Next state function for the NTLMSSP Negotiate packet
  70  *
  71  * @param gensec_security GENSEC state
  72  * @param out_mem_ctx Memory context for *out
  73  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  74  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  75  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
  76  */
  77
  78 NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
  79                                          TALLOC_CTX *out_mem_ctx,
  80                                          const DATA_BLOB request, DATA_BLOB *reply)
  81 {
  82         struct gensec_ntlmssp_context *gensec_ntlmssp =
  83                 talloc_get_type_abort(gensec_security->private_data,
  84                                       struct gensec_ntlmssp_context);
  85         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  86         struct auth4_context *auth_context = gensec_security->auth_context;
  87         DATA_BLOB struct_blob;
  88         uint32_t neg_flags = 0;
  89         uint32_t ntlmssp_command, chal_flags;
  90         uint8_t cryptkey[8];
  91         const char *target_name;
  92         NTSTATUS status;
  93         struct timeval tv_now = timeval_current();
  94         /*
  95          * See [MS-NLMP]
  96          *
  97          * Windows NT 4.0, windows_2000: use 30 minutes,
  98          * Windows XP, Windows Server 2003, Windows Vista,
  99          * Windows Server 2008, Windows 7, and Windows Server 2008 R2
 100          * use 36 hours.
 101          *
 102          * Newer systems doesn't check this, likely because the
 103          * connectionless NTLMSSP is no longer supported.
 104          *
 105          * As we expect the AUTHENTICATION_MESSAGE to arrive
 106          * directly after the NEGOTIATE_MESSAGE (typically less than
 107          * as 1 second later). We use a hard timeout of 30 Minutes.
 108          *
 109          * We don't look at AUTHENTICATE_MESSAGE.NtChallengeResponse.TimeStamp
 110          * instead we just remember our own time.
 111          */
 112         uint32_t max_lifetime = 30 * 60;
 113         struct timeval tv_end = timeval_add(&tv_now, max_lifetime, 0);
 114
 115         /* parse the NTLMSSP packet */
 116 #if 0
 117         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 118 #endif
 119
 120         if (request.length) {
 121                 if (request.length > UINT16_MAX) {
 122                         DEBUG(1, ("ntlmssp_server_negotiate: reject large request of length %u\n",
 123                                 (unsigned int)request.length));
 124                         return NT_STATUS_INVALID_PARAMETER;
 125                 }
 126
 127                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
 128                                                           "NTLMSSP",
 129                                                           &ntlmssp_command,
 130                                                           &neg_flags)) {
 131                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 132                                 (unsigned int)request.length));
 133                         dump_data(2, request.data, request.length);
 134                         return NT_STATUS_INVALID_PARAMETER;
 135                 }
 136                 debug_ntlmssp_flags(neg_flags);
 137
 138                 if (DEBUGLEVEL >= 10) {
 139                         struct NEGOTIATE_MESSAGE *negotiate = talloc(
 140                                 ntlmssp_state, struct NEGOTIATE_MESSAGE);
 141                         if (negotiate != NULL) {
 142                                 status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 143                                         &request, negotiate, negotiate);
 144                                 if (NT_STATUS_IS_OK(status)) {
 145                                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 146                                                         negotiate);
 147                                 }
 148                                 TALLOC_FREE(negotiate);
 149                         }
 150                 }
 151         }
 152
 153         status = ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, "negotiate");
 154         if (!NT_STATUS_IS_OK(status)){
 155                 return status;
 156         }
 157
 158         /* Ask our caller what challenge they would like in the packet */
 159         if (auth_context->get_ntlm_challenge) {
 160                 status = auth_context->get_ntlm_challenge(auth_context, cryptkey);
 161                 if (!NT_STATUS_IS_OK(status)) {
 162                         DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
 163                                   nt_errstr(status)));
 164                         return status;
 165                 }
 166         } else {
 167                 DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
 168                 return NT_STATUS_NOT_IMPLEMENTED;
 169         }
 170
 171         /* The flags we send back are not just the negotiated flags,
 172          * they are also 'what is in this packet'.  Therfore, we
 173          * operate on 'chal_flags' from here on
 174          */
 175
 176         chal_flags = ntlmssp_state->neg_flags;
 177         ntlmssp_state->server.challenge_endtime = timeval_to_nttime(&tv_end);
 178
 179         /* get the right name to fill in as 'target' */
 180         target_name = ntlmssp_target_name(ntlmssp_state,
 181                                           neg_flags, &chal_flags);
 182         if (target_name == NULL)
 183                 return NT_STATUS_INVALID_PARAMETER;
 184
 185         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 186         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 187                                                         cryptkey, 8);
 188
 189         /* This creates the 'blob' of names that appears at the end of the packet */
 190         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 191                 enum ndr_err_code err;
 192                 struct AV_PAIR *pairs = NULL;
 193                 uint32_t count = 5;
 194
 195                 pairs = talloc_zero_array(ntlmssp_state, struct AV_PAIR, count + 1);
 196                 if (pairs == NULL) {
 197                         return NT_STATUS_NO_MEMORY;
 198                 }
 199
 200                 pairs[0].AvId                   = MsvAvNbDomainName;
 201                 pairs[0].Value.AvNbDomainName   = target_name;
 202
 203                 pairs[1].AvId                   = MsvAvNbComputerName;
 204                 pairs[1].Value.AvNbComputerName = ntlmssp_state->server.netbios_name;
 205
 206                 pairs[2].AvId                   = MsvAvDnsDomainName;
 207                 pairs[2].Value.AvDnsDomainName  = ntlmssp_state->server.dns_domain;
 208
 209                 pairs[3].AvId                   = MsvAvDnsComputerName;
 210                 pairs[3].Value.AvDnsComputerName= ntlmssp_state->server.dns_name;
 211
 212                 if (!ntlmssp_state->force_old_spnego) {
 213                         pairs[4].AvId                   = MsvAvTimestamp;
 214                         pairs[4].Value.AvTimestamp      =
 215                                                 timeval_to_nttime(&tv_now);
 216                         count += 1;
 217
 218                         pairs[5].AvId                   = MsvAvEOL;
 219                 } else {
 220                         pairs[4].AvId                   = MsvAvEOL;
 221                 }
 222
 223                 ntlmssp_state->server.av_pair_list.count = count;
 224                 ntlmssp_state->server.av_pair_list.pair = pairs;
 225
 226                 err = ndr_push_struct_blob(&struct_blob,
 227                                         ntlmssp_state,
 228                                         &ntlmssp_state->server.av_pair_list,
 229                                         (ndr_push_flags_fn_t)ndr_push_AV_PAIR_LIST);
 230                 if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
 231                         return NT_STATUS_NO_MEMORY;
 232                 }
 233         } else {
 234                 struct_blob = data_blob_null;
 235         }
 236
 237         {
 238                 /* Marshal the packet in the right format, be it unicode or ASCII */
 239                 const char *gen_string;
 240                 const DATA_BLOB version_blob = ntlmssp_version_blob();
 241
 242                 if (ntlmssp_state->unicode) {
 243                         gen_string = "CdUdbddBb";
 244                 } else {
 245                         gen_string = "CdAdbddBb";
 246                 }
 247
 248                 status = msrpc_gen(out_mem_ctx, reply, gen_string,
 249                         "NTLMSSP",
 250                         NTLMSSP_CHALLENGE,
 251                         target_name,
 252                         chal_flags,
 253                         cryptkey, 8,
 254                         0, 0,
 255                         struct_blob.data, struct_blob.length,
 256                         version_blob.data, version_blob.length);
 257
 258                 if (!NT_STATUS_IS_OK(status)) {
 259                         data_blob_free(&struct_blob);
 260                         return status;
 261                 }
 262
 263                 if (DEBUGLEVEL >= 10) {
 264                         struct CHALLENGE_MESSAGE *challenge = talloc(
 265                                 ntlmssp_state, struct CHALLENGE_MESSAGE);
 266                         if (challenge != NULL) {
 267                                 challenge->NegotiateFlags = chal_flags;
 268                                 status = ntlmssp_pull_CHALLENGE_MESSAGE(
 269                                         reply, challenge, challenge);
 270                                 if (NT_STATUS_IS_OK(status)) {
 271                                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 272                                                         challenge);
 273                                 }
 274                                 TALLOC_FREE(challenge);
 275                         }
 276                 }
 277         }
 278
 279         data_blob_free(&struct_blob);
 280
 281         ntlmssp_state->negotiate_blob = data_blob_dup_talloc(ntlmssp_state,
 282                                                              request);
 283         if (ntlmssp_state->negotiate_blob.length != request.length) {
 284                 return NT_STATUS_NO_MEMORY;
 285         }
 286
 287         ntlmssp_state->challenge_blob = data_blob_dup_talloc(ntlmssp_state,
 288                                                              *reply);
 289         if (ntlmssp_state->challenge_blob.length != reply->length) {
 290                 return NT_STATUS_NO_MEMORY;
 291         }
 292
 293         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 294
 295         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 296 }
 297
 298 struct ntlmssp_server_auth_state {
 299         struct auth_usersupplied_info *user_info;
 300         DATA_BLOB user_session_key;
 301         DATA_BLOB lm_session_key;
 302         /* internal variables used by KEY_EXCH (client-supplied user session key */
 303         DATA_BLOB encrypted_session_key;
 304         bool doing_ntlm2;
 305         /* internal variables used by NTLM2 */
 306         uint8_t session_nonce[16];
 307 };
 308
 309 static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security,
 310                                        struct gensec_ntlmssp_context *gensec_ntlmssp,
 311                                        struct ntlmssp_server_auth_state *state,
 312                                        const DATA_BLOB request);
 313 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 314                                         struct gensec_ntlmssp_context *gensec_ntlmssp,
 315                                         struct ntlmssp_server_auth_state *state,
 316                                         DATA_BLOB request);
 317
 318 struct tevent_req *ntlmssp_server_auth_send(TALLOC_CTX *mem_ctx,
 319                                             struct tevent_context *ev,
 320                                             struct gensec_security *gensec_security,
 321                                             const DATA_BLOB in)
 322 {
 323         struct gensec_ntlmssp_context *gensec_ntlmssp =
 324                 talloc_get_type_abort(gensec_security->private_data,
 325                                       struct gensec_ntlmssp_context);
 326         struct auth4_context *auth_context = gensec_security->auth_context;
 327         struct tevent_req *req = NULL;
 328         struct ntlmssp_server_auth_state *state = NULL;
 329         uint8_t authoritative = 0;
 330         NTSTATUS status;
 331
 332         req = tevent_req_create(mem_ctx, &state,
 333                                 struct ntlmssp_server_auth_state);
 334         if (req == NULL) {
 335                 return NULL;
 336         }
 337
 338         status = ntlmssp_server_preauth(gensec_security,
 339                                         gensec_ntlmssp,
 340                                         state, in);
 341         if (tevent_req_nterror(req, status)) {
 342                 return tevent_req_post(req, ev);
 343         }
 344
 345         if (auth_context->check_ntlm_password == NULL) {
 346                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 347                 return tevent_req_post(req, ev);
 348         }
 349
 350         status = auth_context->check_ntlm_password(auth_context,
 351                                                    gensec_ntlmssp,
 352                                                    state->user_info,
 353                                                    &authoritative,
 354                                                    &gensec_ntlmssp->server_returned_info,
 355                                                    &state->user_session_key,
 356                                                    &state->lm_session_key);
 357         if (!NT_STATUS_IS_OK(status)) {
 358                 DBG_INFO("Checking NTLMSSP password for %s\\%s failed: %s\n",
 359                          state->user_info->client.domain_name,
 360                          state->user_info->client.account_name,
 361                          nt_errstr(status));
 362         }
 363         if (tevent_req_nterror(req, status)) {
 364                 return tevent_req_post(req, ev);
 365         }
 366         talloc_steal(state, state->user_session_key.data);
 367         talloc_steal(state, state->lm_session_key.data);
 368
 369         status = ntlmssp_server_postauth(gensec_security,
 370                                          gensec_ntlmssp,
 371                                          state, in);
 372         if (tevent_req_nterror(req, status)) {
 373                 return tevent_req_post(req, ev);
 374         }
 375
 376         tevent_req_done(req);
 377         return tevent_req_post(req, ev);
 378 }
 379
 380 /**
 381  * Next state function for the Authenticate packet
 382  *
 383  * @param ntlmssp_state NTLMSSP State
 384  * @param request The request, as a DATA_BLOB
 385  * @return Errors or NT_STATUS_OK.
 386  */
 387
 388 static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security,
 389                                        struct gensec_ntlmssp_context *gensec_ntlmssp,
 390                                        struct ntlmssp_server_auth_state *state,
 391                                        const DATA_BLOB request)
 392 {
 393         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 394         struct auth4_context *auth_context = gensec_security->auth_context;
 395         struct auth_usersupplied_info *user_info = NULL;
 396         uint32_t ntlmssp_command, auth_flags;
 397         NTSTATUS nt_status;
 398         const unsigned int version_len = 8;
 399         DATA_BLOB version_blob = data_blob_null;
 400         const unsigned int mic_len = NTLMSSP_MIC_SIZE;
 401         DATA_BLOB mic_blob = data_blob_null;
 402         uint8_t session_nonce_hash[16];
 403         const char *parse_string;
 404         bool ok;
 405         struct timeval endtime;
 406         bool expired = false;
 407
 408 #if 0
 409         file_save("ntlmssp_auth.dat", request.data, request.length);
 410 #endif
 411
 412         if (ntlmssp_state->unicode) {
 413                 parse_string = "CdBBUUUBdbb";
 414         } else {
 415                 parse_string = "CdBBAAABdbb";
 416         }
 417
 418         /* zero these out */
 419         data_blob_free(&ntlmssp_state->session_key);
 420         data_blob_free(&ntlmssp_state->lm_resp);
 421         data_blob_free(&ntlmssp_state->nt_resp);
 422
 423         ntlmssp_state->user = NULL;
 424         ntlmssp_state->domain = NULL;
 425         ntlmssp_state->client.netbios_name = NULL;
 426
 427         /* now the NTLMSSP encoded auth hashes */
 428         ok = msrpc_parse(ntlmssp_state, &request, parse_string,
 429                          "NTLMSSP",
 430                          &ntlmssp_command,
 431                          &ntlmssp_state->lm_resp,
 432                          &ntlmssp_state->nt_resp,
 433                          &ntlmssp_state->domain,
 434                          &ntlmssp_state->user,
 435                          &ntlmssp_state->client.netbios_name,
 436                          &state->encrypted_session_key,
 437                          &auth_flags,
 438                          &version_blob, version_len,
 439                          &mic_blob, mic_len);
 440         if (!ok) {
 441                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 442                 dump_data(10, request.data, request.length);
 443
 444                 data_blob_free(&version_blob);
 445                 data_blob_free(&mic_blob);
 446
 447                 if (ntlmssp_state->unicode) {
 448                         parse_string = "CdBBUUUBd";
 449                 } else {
 450                         parse_string = "CdBBAAABd";
 451                 }
 452
 453                 ok = msrpc_parse(ntlmssp_state, &request, parse_string,
 454                                  "NTLMSSP",
 455                                  &ntlmssp_command,
 456                                  &ntlmssp_state->lm_resp,
 457                                  &ntlmssp_state->nt_resp,
 458                                  &ntlmssp_state->domain,
 459                                  &ntlmssp_state->user,
 460                                  &ntlmssp_state->client.netbios_name,
 461                                  &state->encrypted_session_key,
 462                                  &auth_flags);
 463         }
 464
 465         if (!ok) {
 466                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 467                 dump_data(10, request.data, request.length);
 468
 469                 /* zero this out */
 470                 data_blob_free(&state->encrypted_session_key);
 471                 auth_flags = 0;
 472
 473                 /* Try again with a shorter string (Win9X truncates this packet) */
 474                 if (ntlmssp_state->unicode) {
 475                         parse_string = "CdBBUUU";
 476                 } else {
 477                         parse_string = "CdBBAAA";
 478                 }
 479
 480                 /* now the NTLMSSP encoded auth hashes */
 481                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 482                                  "NTLMSSP",
 483                                  &ntlmssp_command,
 484                                  &ntlmssp_state->lm_resp,
 485                                  &ntlmssp_state->nt_resp,
 486                                  &ntlmssp_state->domain,
 487                                  &ntlmssp_state->user,
 488                                  &ntlmssp_state->client.netbios_name)) {
 489                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 490                         dump_data(2, request.data, request.length);
 491
 492                         return NT_STATUS_INVALID_PARAMETER;
 493                 }
 494         }
 495
 496         talloc_steal(state, state->encrypted_session_key.data);
 497
 498         if (auth_flags != 0) {
 499                 nt_status = ntlmssp_handle_neg_flags(ntlmssp_state,
 500                                                      auth_flags,
 501                                                      "authenticate");
 502                 if (!NT_STATUS_IS_OK(nt_status)){
 503                         return nt_status;
 504                 }
 505         }
 506
 507         if (DEBUGLEVEL >= 10) {
 508                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 509                         ntlmssp_state, struct AUTHENTICATE_MESSAGE);
 510                 if (authenticate != NULL) {
 511                         NTSTATUS status;
 512                         authenticate->NegotiateFlags = auth_flags;
 513                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 514                                 &request, authenticate, authenticate);
 515                         if (NT_STATUS_IS_OK(status)) {
 516                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 517                                                 authenticate);
 518                         }
 519                         TALLOC_FREE(authenticate);
 520                 }
 521         }
 522
 523         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 524                  ntlmssp_state->user, ntlmssp_state->domain,
 525                  ntlmssp_state->client.netbios_name,
 526                  (unsigned long)ntlmssp_state->lm_resp.length,
 527                  (unsigned long)ntlmssp_state->nt_resp.length));
 528
 529 #if 0
 530         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 531         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 532 #endif
 533
 534         if (ntlmssp_state->nt_resp.length > 24) {
 535                 struct NTLMv2_RESPONSE v2_resp;
 536                 enum ndr_err_code err;
 537                 uint32_t i = 0;
 538                 uint32_t count = 0;
 539                 const struct AV_PAIR *flags = NULL;
 540                 const struct AV_PAIR *eol = NULL;
 541                 uint32_t av_flags = 0;
 542
 543                 err = ndr_pull_struct_blob(&ntlmssp_state->nt_resp,
 544                                         ntlmssp_state,
 545                                         &v2_resp,
 546                                         (ndr_pull_flags_fn_t)ndr_pull_NTLMv2_RESPONSE);
 547                 if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
 548                         nt_status = ndr_map_error2ntstatus(err);
 549                         DEBUG(1,("%s: failed to parse NTLMv2_RESPONSE of length %zu for "
 550                                  "user=[%s] domain=[%s] workstation=[%s] - %s %s\n",
 551                                  __func__, ntlmssp_state->nt_resp.length,
 552                                  ntlmssp_state->user, ntlmssp_state->domain,
 553                                  ntlmssp_state->client.netbios_name,
 554                                  ndr_errstr(err), nt_errstr(nt_status)));
 555                         return nt_status;
 556                 }
 557
 558                 if (DEBUGLVL(10)) {
 559                         NDR_PRINT_DEBUG(NTLMv2_RESPONSE, &v2_resp);
 560                 }
 561
 562                 eol = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
 563                                           MsvAvEOL);
 564                 if (eol == NULL) {
 565                         DEBUG(1,("%s: missing MsvAvEOL for "
 566                                  "user=[%s] domain=[%s] workstation=[%s]\n",
 567                                  __func__, ntlmssp_state->user, ntlmssp_state->domain,
 568                                  ntlmssp_state->client.netbios_name));
 569                         return NT_STATUS_INVALID_PARAMETER;
 570                 }
 571
 572                 flags = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
 573                                             MsvAvFlags);
 574                 if (flags != NULL) {
 575                         av_flags = flags->Value.AvFlags;
 576                 }
 577
 578                 if (av_flags & NTLMSSP_AVFLAG_MIC_IN_AUTHENTICATE_MESSAGE) {
 579                         if (mic_blob.length != NTLMSSP_MIC_SIZE) {
 580                                 DEBUG(1,("%s: mic_blob.length[%u] for "
 581                                          "user=[%s] domain=[%s] workstation=[%s]\n",
 582                                          __func__,
 583                                          (unsigned)mic_blob.length,
 584                                          ntlmssp_state->user,
 585                                          ntlmssp_state->domain,
 586                                          ntlmssp_state->client.netbios_name));
 587                                 return NT_STATUS_INVALID_PARAMETER;
 588                         }
 589
 590                         if (request.length <
 591                             (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE))
 592                         {
 593                                 DEBUG(1,("%s: missing MIC "
 594                                          "request.length[%u] for "
 595                                          "user=[%s] domain=[%s] workstation=[%s]\n",
 596                                          __func__,
 597                                          (unsigned)request.length,
 598                                          ntlmssp_state->user,
 599                                          ntlmssp_state->domain,
 600                                          ntlmssp_state->client.netbios_name));
 601                                 return NT_STATUS_INVALID_PARAMETER;
 602                         }
 603
 604                         ntlmssp_state->new_spnego = true;
 605                 }
 606
 607                 count = ntlmssp_state->server.av_pair_list.count;
 608                 if (v2_resp.Challenge.AvPairs.count < count) {
 609                         return NT_STATUS_INVALID_PARAMETER;
 610                 }
 611
 612                 for (i = 0; i < count; i++) {
 613                         const struct AV_PAIR *sp =
 614                                 &ntlmssp_state->server.av_pair_list.pair[i];
 615                         const struct AV_PAIR *cp = NULL;
 616
 617                         if (sp->AvId == MsvAvEOL) {
 618                                 continue;
 619                         }
 620
 621                         cp = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
 622                                                  sp->AvId);
 623                         if (cp == NULL) {
 624                                 DEBUG(1,("%s: AvId 0x%x missing for"
 625                                          "user=[%s] domain=[%s] "
 626                                          "workstation=[%s]\n",
 627                                          __func__,
 628                                          (unsigned)sp->AvId,
 629                                          ntlmssp_state->user,
 630                                          ntlmssp_state->domain,
 631                                          ntlmssp_state->client.netbios_name));
 632                                 return NT_STATUS_INVALID_PARAMETER;
 633                         }
 634
 635                         switch (cp->AvId) {
 636 #define CASE_STRING(v) case Msv ## v: do { \
 637         int cmp; \
 638         if (sp->Value.v == NULL) { \
 639                 return NT_STATUS_INTERNAL_ERROR; \
 640         } \
 641         if (cp->Value.v == NULL) { \
 642                 DEBUG(1,("%s: invalid %s " \
 643                          "got[%s] expect[%s] for " \
 644                          "user=[%s] domain=[%s] workstation=[%s]\n", \
 645                          __func__, #v, \
 646                          cp->Value.v, \
 647                          sp->Value.v, \
 648                          ntlmssp_state->user, \
 649                          ntlmssp_state->domain, \
 650                          ntlmssp_state->client.netbios_name)); \
 651                 return NT_STATUS_INVALID_PARAMETER; \
 652         } \
 653         cmp = strcmp(cp->Value.v, sp->Value.v); \
 654         if (cmp != 0) { \
 655                 DEBUG(1,("%s: invalid %s " \
 656                          "got[%s] expect[%s] for " \
 657                          "user=[%s] domain=[%s] workstation=[%s]\n", \
 658                          __func__, #v, \
 659                          cp->Value.v, \
 660                          sp->Value.v, \
 661                          ntlmssp_state->user, \
 662                          ntlmssp_state->domain, \
 663                          ntlmssp_state->client.netbios_name)); \
 664                 return NT_STATUS_INVALID_PARAMETER; \
 665         } \
 666 } while(0); break
 667                         CASE_STRING(AvNbComputerName);
 668                         CASE_STRING(AvNbDomainName);
 669                         CASE_STRING(AvDnsComputerName);
 670                         CASE_STRING(AvDnsDomainName);
 671                         CASE_STRING(AvDnsTreeName);
 672                         case MsvAvTimestamp:
 673                                 if (cp->Value.AvTimestamp != sp->Value.AvTimestamp) {
 674                                         struct timeval ct;
 675                                         struct timeval st;
 676                                         struct timeval_buf tmp1;
 677                                         struct timeval_buf tmp2;
 678
 679                                         nttime_to_timeval(&ct,
 680                                                           cp->Value.AvTimestamp);
 681                                         nttime_to_timeval(&st,
 682                                                           sp->Value.AvTimestamp);
 683
 684                                         DEBUG(1,("%s: invalid AvTimestamp "
 685                                                  "got[%s] expect[%s] for "
 686                                                  "user=[%s] domain=[%s] "
 687                                                  "workstation=[%s]\n",
 688                                                  __func__,
 689                                                  timeval_str_buf(&ct, false,
 690                                                                  true, &tmp1),
 691                                                  timeval_str_buf(&st, false,
 692                                                                  true, &tmp2),
 693                                                  ntlmssp_state->user,
 694                                                  ntlmssp_state->domain,
 695                                                  ntlmssp_state->client.netbios_name));
 696                                         return NT_STATUS_INVALID_PARAMETER;
 697                                 }
 698                                 break;
 699                         default:
 700                                 /*
 701                                  * This can't happen as we control
 702                                  * ntlmssp_state->server.av_pair_list
 703                                  */
 704                                 return NT_STATUS_INTERNAL_ERROR;
 705                         }
 706                 }
 707         }
 708
 709         nttime_to_timeval(&endtime, ntlmssp_state->server.challenge_endtime);
 710         expired = timeval_expired(&endtime);
 711         if (expired) {
 712                 struct timeval_buf tmp;
 713                 DEBUG(1,("%s: challenge invalid (expired %s) for "
 714                          "user=[%s] domain=[%s] workstation=[%s]\n",
 715                          __func__,
 716                          timeval_str_buf(&endtime, false, true, &tmp),
 717                          ntlmssp_state->user, ntlmssp_state->domain,
 718                          ntlmssp_state->client.netbios_name));
 719                 return NT_STATUS_INVALID_PARAMETER;
 720         }
 721
 722         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 723            client challenge
 724
 725            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 726         */
 727         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 728                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 729                         MD5_CTX md5_session_nonce_ctx;
 730                         state->doing_ntlm2 = true;
 731
 732                         memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8);
 733                         memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 734
 735                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 736
 737                         MD5Init(&md5_session_nonce_ctx);
 738                         MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16);
 739                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 740
 741                         /* LM response is no longer useful */
 742                         data_blob_free(&ntlmssp_state->lm_resp);
 743
 744                         /* We changed the effective challenge - set it */
 745                         if (auth_context->set_ntlm_challenge) {
 746                                 nt_status = auth_context->set_ntlm_challenge(auth_context,
 747                                                                              session_nonce_hash,
 748                                                                              "NTLMSSP callback (NTLM2)");
 749                                 if (!NT_STATUS_IS_OK(nt_status)) {
 750                                         DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
 751                                                   nt_errstr(nt_status)));
 752                                         return nt_status;
 753                                 }
 754                         } else {
 755                                 DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't have facility for challenge to be set\n"));
 756
 757                                 return NT_STATUS_NOT_IMPLEMENTED;
 758                         }
 759
 760                         /* LM Key is incompatible. */
 761                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 762                 }
 763         }
 764
 765         user_info = talloc_zero(state, struct auth_usersupplied_info);
 766         if (!user_info) {
 767                 return NT_STATUS_NO_MEMORY;
 768         }
 769
 770         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 771         user_info->flags = 0;
 772         user_info->mapped_state = false;
 773         user_info->client.account_name = ntlmssp_state->user;
 774         user_info->client.domain_name = ntlmssp_state->domain;
 775         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 776         user_info->remote_host = gensec_get_remote_address(gensec_security);
 777         user_info->local_host = gensec_get_local_address(gensec_security);
 778         user_info->service_description
 779                 = gensec_get_target_service_description(gensec_security);
 780
 781         /*
 782          * This will just be the string "NTLMSSP" from
 783          * gensec_ntlmssp_final_auth_type, but ensures it stays in sync
 784          * with the same use in the authorization logging triggered by
 785          * gensec_session_info() later
 786          */
 787         user_info->auth_description = gensec_final_auth_type(gensec_security);
 788
 789         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 790         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 791         user_info->password.response.nt = ntlmssp_state->nt_resp;
 792
 793         state->user_info = user_info;
 794         return NT_STATUS_OK;
 795 }
 796
 797 /**
 798  * Next state function for the Authenticate packet
 799  * (after authentication - figures out the session keys etc)
 800  *
 801  * @param ntlmssp_state NTLMSSP State
 802  * @return Errors or NT_STATUS_OK.
 803  */
 804
 805 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 806                                         struct gensec_ntlmssp_context *gensec_ntlmssp,
 807                                         struct ntlmssp_server_auth_state *state,
 808                                         DATA_BLOB request)
 809 {
 810         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 811         struct auth4_context *auth_context = gensec_security->auth_context;
 812         DATA_BLOB user_session_key = state->user_session_key;
 813         DATA_BLOB lm_session_key = state->lm_session_key;
 814         NTSTATUS nt_status = NT_STATUS_OK;
 815         DATA_BLOB session_key = data_blob(NULL, 0);
 816         struct auth_session_info *session_info = NULL;
 817
 818         TALLOC_FREE(state->user_info);
 819
 820         if (lpcfg_map_to_guest(gensec_security->settings->lp_ctx) != NEVER_MAP_TO_GUEST
 821             && auth_context->generate_session_info != NULL)
 822         {
 823                 NTSTATUS tmp_status;
 824
 825                 /*
 826                  * We need to check if the auth is anonymous or mapped to guest
 827                  */
 828                 tmp_status = auth_context->generate_session_info(auth_context, state,
 829                                                                  gensec_ntlmssp->server_returned_info,
 830                                                                  gensec_ntlmssp->ntlmssp_state->user,
 831                                                                  AUTH_SESSION_INFO_SIMPLE_PRIVILEGES,
 832                                                                  &session_info);
 833                 if (!NT_STATUS_IS_OK(tmp_status)) {
 834                         /*
 835                          * We don't care about failures,
 836                          * the worst result is that we try MIC checking
 837                          * for a map to guest authentication.
 838                          */
 839                         TALLOC_FREE(session_info);
 840                 }
 841         }
 842
 843         if (session_info != NULL) {
 844                 if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 845                         /*
 846                          * Anonymous and GUEST are not secure anyway.
 847                          * avoid new_spnego and MIC checking.
 848                          */
 849                         ntlmssp_state->new_spnego = false;
 850                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
 851                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
 852                 }
 853                 TALLOC_FREE(session_info);
 854         }
 855
 856         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 857         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 858
 859         /* Handle the different session key derivation for NTLM2 */
 860         if (state->doing_ntlm2) {
 861                 if (user_session_key.data && user_session_key.length == 16) {
 862                         session_key = data_blob_talloc(ntlmssp_state,
 863                                                        NULL, 16);
 864                         hmac_md5(user_session_key.data, state->session_nonce,
 865                                  sizeof(state->session_nonce), session_key.data);
 866                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 867                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 868
 869                 } else {
 870                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 871                         session_key = data_blob_null;
 872                 }
 873         } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 874                 /* Ensure we can never get here on NTLMv2 */
 875                 && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
 876
 877                 if (lm_session_key.data && lm_session_key.length >= 8) {
 878                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 879                                 session_key = data_blob_talloc(ntlmssp_state,
 880                                                                NULL, 16);
 881                                 if (session_key.data == NULL) {
 882                                         return NT_STATUS_NO_MEMORY;
 883                                 }
 884                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 885                                                           session_key.data);
 886                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 887                         } else {
 888                                 static const uint8_t zeros[24] = {0, };
 889                                 session_key = data_blob_talloc(
 890                                         ntlmssp_state, NULL, 16);
 891                                 if (session_key.data == NULL) {
 892                                         return NT_STATUS_NO_MEMORY;
 893                                 }
 894                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 895                                                           session_key.data);
 896                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 897                         }
 898                         dump_data_pw("LM session key:\n", session_key.data,
 899                                      session_key.length);
 900                 } else {
 901                         /* LM Key not selected */
 902                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 903
 904                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 905                         session_key = data_blob_null;
 906                 }
 907
 908         } else if (user_session_key.data) {
 909                 session_key = user_session_key;
 910                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 911                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 912
 913                 /* LM Key not selected */
 914                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 915
 916         } else if (lm_session_key.data) {
 917                 /* Very weird to have LM key, but no user session key, but anyway.. */
 918                 session_key = lm_session_key;
 919                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 920                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 921
 922                 /* LM Key not selected */
 923                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 924
 925         } else {
 926                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 927                 session_key = data_blob_null;
 928
 929                 /* LM Key not selected */
 930                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 931         }
 932
 933         /* With KEY_EXCH, the client supplies the proposed session key,
 934            but encrypts it with the long-term key */
 935         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 936                 if (!state->encrypted_session_key.data
 937                     || state->encrypted_session_key.length != 16) {
 938                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 939                                   (unsigned)state->encrypted_session_key.length));
 940                         return NT_STATUS_INVALID_PARAMETER;
 941                 } else if (!session_key.data || session_key.length != 16) {
 942                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 943                                   (unsigned int)session_key.length));
 944                         ntlmssp_state->session_key = session_key;
 945                         talloc_steal(ntlmssp_state, session_key.data);
 946                 } else {
 947                         dump_data_pw("KEY_EXCH session key (enc):\n",
 948                                      state->encrypted_session_key.data,
 949                                      state->encrypted_session_key.length);
 950                         arcfour_crypt(state->encrypted_session_key.data,
 951                                       session_key.data,
 952                                       state->encrypted_session_key.length);
 953                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 954                                                                       state->encrypted_session_key.data,
 955                                                                       state->encrypted_session_key.length);
 956                         dump_data_pw("KEY_EXCH session key:\n",
 957                                      state->encrypted_session_key.data,
 958                                      state->encrypted_session_key.length);
 959                 }
 960         } else {
 961                 ntlmssp_state->session_key = session_key;
 962                 talloc_steal(ntlmssp_state, session_key.data);
 963         }
 964
 965         if (ntlmssp_state->new_spnego) {
 966                 HMACMD5Context ctx;
 967                 uint8_t mic_buffer[NTLMSSP_MIC_SIZE] = { 0, };
 968                 int cmp;
 969
 970                 hmac_md5_init_limK_to_64(ntlmssp_state->session_key.data,
 971                                          ntlmssp_state->session_key.length,
 972                                          &ctx);
 973
 974                 hmac_md5_update(ntlmssp_state->negotiate_blob.data,
 975                                 ntlmssp_state->negotiate_blob.length,
 976                                 &ctx);
 977                 hmac_md5_update(ntlmssp_state->challenge_blob.data,
 978                                 ntlmssp_state->challenge_blob.length,
 979                                 &ctx);
 980
 981                 /* checked were we set ntlmssp_state->new_spnego */
 982                 SMB_ASSERT(request.length >
 983                            (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE));
 984
 985                 hmac_md5_update(request.data, NTLMSSP_MIC_OFFSET, &ctx);
 986                 hmac_md5_update(mic_buffer, NTLMSSP_MIC_SIZE, &ctx);
 987                 hmac_md5_update(request.data +
 988                                 (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE),
 989                                 request.length -
 990                                 (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE),
 991                                 &ctx);
 992                 hmac_md5_final(mic_buffer, &ctx);
 993
 994                 cmp = memcmp(request.data + NTLMSSP_MIC_OFFSET,
 995                              mic_buffer, NTLMSSP_MIC_SIZE);
 996                 if (cmp != 0) {
 997                         DEBUG(1,("%s: invalid NTLMSSP_MIC for "
 998                                  "user=[%s] domain=[%s] workstation=[%s]\n",
 999                                  __func__,
1000                                  ntlmssp_state->user,
1001                                  ntlmssp_state->domain,
1002                                  ntlmssp_state->client.netbios_name));
1003                         dump_data(1, request.data + NTLMSSP_MIC_OFFSET,
1004                                   NTLMSSP_MIC_SIZE);
1005                         dump_data(1, mic_buffer,
1006                                   NTLMSSP_MIC_SIZE);
1007                         return NT_STATUS_INVALID_PARAMETER;
1008                 }
1009         }
1010
1011         data_blob_free(&ntlmssp_state->negotiate_blob);
1012         data_blob_free(&ntlmssp_state->challenge_blob);
1013
1014         if (gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
1015                 nt_status = ntlmssp_sign_init(ntlmssp_state);
1016         }
1017
1018         data_blob_clear_free(&ntlmssp_state->internal_chal);
1019         data_blob_clear_free(&ntlmssp_state->chal);
1020         data_blob_clear_free(&ntlmssp_state->lm_resp);
1021         data_blob_clear_free(&ntlmssp_state->nt_resp);
1022
1023         ntlmssp_state->expected_state = NTLMSSP_DONE;
1024
1025         return nt_status;
1026 }
1027
1028 NTSTATUS ntlmssp_server_auth_recv(struct tevent_req *req,
1029                                   TALLOC_CTX *out_mem_ctx,
1030                                   DATA_BLOB *out)
1031 {
1032         NTSTATUS status;
1033
1034         *out = data_blob_null;
1035
1036         if (tevent_req_is_nterror(req, &status)) {
1037                 tevent_req_received(req);
1038                 return status;
1039         }
1040
1041         tevent_req_received(req);
1042         return NT_STATUS_OK;
1043 }