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