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 "auth/ntlmssp/ntlmssp.h"
  25 #include "auth/ntlmssp/ntlmssp_private.h"
  26 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  27 #include "auth/ntlmssp/ntlmssp_ndr.h"
  28 #include "../libcli/auth/libcli_auth.h"
  29 #include "../lib/crypto/crypto.h"
  30 #include "auth/gensec/gensec.h"
  31 #include "auth/gensec/gensec_internal.h"
  32 #include "auth/common_auth.h"
  33
  34 /**
  35  * Determine correct target name flags for reply, given server role
  36  * and negotiated flags
  37  *
  38  * @param ntlmssp_state NTLMSSP State
  39  * @param neg_flags The flags from the packet
  40  * @param chal_flags The flags to be set in the reply packet
  41  * @return The 'target name' string.
  42  */
  43
  44 const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
  45                                 uint32_t neg_flags, uint32_t *chal_flags)
  46 {
  47         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  48                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
  49                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  50                 if (ntlmssp_state->server.is_standalone) {
  51                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  52                         return ntlmssp_state->server.netbios_name;
  53                 } else {
  54                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
  55                         return ntlmssp_state->server.netbios_domain;
  56                 };
  57         } else {
  58                 return "";
  59         }
  60 }
  61
  62 /**
  63  * Next state function for the NTLMSSP Negotiate packet
  64  *
  65  * @param gensec_security GENSEC state
  66  * @param out_mem_ctx Memory context for *out
  67  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  68  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  69  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
  70  */
  71
  72 NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
  73                                          TALLOC_CTX *out_mem_ctx,
  74                                          const DATA_BLOB request, DATA_BLOB *reply)
  75 {
  76         struct gensec_ntlmssp_context *gensec_ntlmssp =
  77                 talloc_get_type_abort(gensec_security->private_data,
  78                                       struct gensec_ntlmssp_context);
  79         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  80         struct auth4_context *auth_context = gensec_security->auth_context;
  81         DATA_BLOB struct_blob;
  82         uint32_t neg_flags = 0;
  83         uint32_t ntlmssp_command, chal_flags;
  84         uint8_t cryptkey[8];
  85         const char *target_name;
  86         NTSTATUS status;
  87
  88         /* parse the NTLMSSP packet */
  89 #if 0
  90         file_save("ntlmssp_negotiate.dat", request.data, request.length);
  91 #endif
  92
  93         if (request.length) {
  94                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
  95                                                           "NTLMSSP",
  96                                                           &ntlmssp_command,
  97                                                           &neg_flags)) {
  98                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
  99                                 (unsigned int)request.length));
 100                         dump_data(2, request.data, request.length);
 101                         return NT_STATUS_INVALID_PARAMETER;
 102                 }
 103                 debug_ntlmssp_flags(neg_flags);
 104
 105                 if (DEBUGLEVEL >= 10) {
 106                         struct NEGOTIATE_MESSAGE *negotiate = talloc(
 107                                 ntlmssp_state, struct NEGOTIATE_MESSAGE);
 108                         if (negotiate != NULL) {
 109                                 status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 110                                         &request, negotiate, negotiate);
 111                                 if (NT_STATUS_IS_OK(status)) {
 112                                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 113                                                         negotiate);
 114                                 }
 115                                 TALLOC_FREE(negotiate);
 116                         }
 117                 }
 118         }
 119
 120         status = ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, "negotiate");
 121         if (!NT_STATUS_IS_OK(status)){
 122                 return status;
 123         }
 124
 125         /* Ask our caller what challenge they would like in the packet */
 126         if (auth_context->get_ntlm_challenge) {
 127                 status = auth_context->get_ntlm_challenge(auth_context, cryptkey);
 128                 if (!NT_STATUS_IS_OK(status)) {
 129                         DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
 130                                   nt_errstr(status)));
 131                         return status;
 132                 }
 133         } else {
 134                 DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
 135                 return NT_STATUS_NOT_IMPLEMENTED;
 136         }
 137
 138         /* The flags we send back are not just the negotiated flags,
 139          * they are also 'what is in this packet'.  Therfore, we
 140          * operate on 'chal_flags' from here on
 141          */
 142
 143         chal_flags = ntlmssp_state->neg_flags;
 144
 145         /* get the right name to fill in as 'target' */
 146         target_name = ntlmssp_target_name(ntlmssp_state,
 147                                           neg_flags, &chal_flags);
 148         if (target_name == NULL)
 149                 return NT_STATUS_INVALID_PARAMETER;
 150
 151         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 152         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 153                                                         cryptkey, 8);
 154
 155         /* This creates the 'blob' of names that appears at the end of the packet */
 156         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 157                 enum ndr_err_code err;
 158                 struct AV_PAIR *pairs = NULL;
 159                 uint32_t count = 5;
 160
 161                 pairs = talloc_zero_array(ntlmssp_state, struct AV_PAIR, count);
 162                 if (pairs == NULL) {
 163                         return NT_STATUS_NO_MEMORY;
 164                 }
 165
 166                 pairs[0].AvId                   = MsvAvNbDomainName;
 167                 pairs[0].Value.AvNbDomainName   = target_name;
 168
 169                 pairs[1].AvId                   = MsvAvNbComputerName;
 170                 pairs[1].Value.AvNbComputerName = ntlmssp_state->server.netbios_name;
 171
 172                 pairs[2].AvId                   = MsvAvDnsDomainName;
 173                 pairs[2].Value.AvDnsDomainName  = ntlmssp_state->server.dns_domain;
 174
 175                 pairs[3].AvId                   = MsvAvDnsComputerName;
 176                 pairs[3].Value.AvDnsComputerName= ntlmssp_state->server.dns_name;
 177
 178                 pairs[4].AvId                   = MsvAvEOL;
 179
 180                 ntlmssp_state->server.av_pair_list.count = count;
 181                 ntlmssp_state->server.av_pair_list.pair = pairs;
 182
 183                 err = ndr_push_struct_blob(&struct_blob,
 184                                         ntlmssp_state,
 185                                         &ntlmssp_state->server.av_pair_list,
 186                                         (ndr_push_flags_fn_t)ndr_push_AV_PAIR_LIST);
 187                 if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
 188                         return NT_STATUS_NO_MEMORY;
 189                 }
 190         } else {
 191                 struct_blob = data_blob_null;
 192         }
 193
 194         {
 195                 /* Marshal the packet in the right format, be it unicode or ASCII */
 196                 const char *gen_string;
 197                 const DATA_BLOB version_blob = ntlmssp_version_blob();
 198
 199                 if (ntlmssp_state->unicode) {
 200                         gen_string = "CdUdbddBb";
 201                 } else {
 202                         gen_string = "CdAdbddBb";
 203                 }
 204
 205                 status = msrpc_gen(out_mem_ctx, reply, gen_string,
 206                         "NTLMSSP",
 207                         NTLMSSP_CHALLENGE,
 208                         target_name,
 209                         chal_flags,
 210                         cryptkey, 8,
 211                         0, 0,
 212                         struct_blob.data, struct_blob.length,
 213                         version_blob.data, version_blob.length);
 214
 215                 if (!NT_STATUS_IS_OK(status)) {
 216                         data_blob_free(&struct_blob);
 217                         return status;
 218                 }
 219
 220                 if (DEBUGLEVEL >= 10) {
 221                         struct CHALLENGE_MESSAGE *challenge = talloc(
 222                                 ntlmssp_state, struct CHALLENGE_MESSAGE);
 223                         if (challenge != NULL) {
 224                                 challenge->NegotiateFlags = chal_flags;
 225                                 status = ntlmssp_pull_CHALLENGE_MESSAGE(
 226                                         reply, challenge, challenge);
 227                                 if (NT_STATUS_IS_OK(status)) {
 228                                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 229                                                         challenge);
 230                                 }
 231                                 TALLOC_FREE(challenge);
 232                         }
 233                 }
 234         }
 235
 236         data_blob_free(&struct_blob);
 237
 238         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 239
 240         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 241 }
 242
 243 struct ntlmssp_server_auth_state {
 244         DATA_BLOB user_session_key;
 245         DATA_BLOB lm_session_key;
 246         /* internal variables used by KEY_EXCH (client-supplied user session key */
 247         DATA_BLOB encrypted_session_key;
 248         bool doing_ntlm2;
 249         /* internal variables used by NTLM2 */
 250         uint8_t session_nonce[16];
 251 };
 252
 253 /**
 254  * Next state function for the Authenticate packet
 255  *
 256  * @param ntlmssp_state NTLMSSP State
 257  * @param request The request, as a DATA_BLOB
 258  * @return Errors or NT_STATUS_OK.
 259  */
 260
 261 static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security,
 262                                        struct gensec_ntlmssp_context *gensec_ntlmssp,
 263                                        struct ntlmssp_server_auth_state *state,
 264                                        const DATA_BLOB request)
 265 {
 266         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 267         struct auth4_context *auth_context = gensec_security->auth_context;
 268         uint32_t ntlmssp_command, auth_flags;
 269         NTSTATUS nt_status;
 270
 271         uint8_t session_nonce_hash[16];
 272
 273         const char *parse_string;
 274
 275 #if 0
 276         file_save("ntlmssp_auth.dat", request.data, request.length);
 277 #endif
 278
 279         if (ntlmssp_state->unicode) {
 280                 parse_string = "CdBBUUUBd";
 281         } else {
 282                 parse_string = "CdBBAAABd";
 283         }
 284
 285         /* zero these out */
 286         data_blob_free(&ntlmssp_state->session_key);
 287         data_blob_free(&ntlmssp_state->lm_resp);
 288         data_blob_free(&ntlmssp_state->nt_resp);
 289
 290         ntlmssp_state->user = NULL;
 291         ntlmssp_state->domain = NULL;
 292         ntlmssp_state->client.netbios_name = NULL;
 293
 294         /* now the NTLMSSP encoded auth hashes */
 295         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 296                          "NTLMSSP",
 297                          &ntlmssp_command,
 298                          &ntlmssp_state->lm_resp,
 299                          &ntlmssp_state->nt_resp,
 300                          &ntlmssp_state->domain,
 301                          &ntlmssp_state->user,
 302                          &ntlmssp_state->client.netbios_name,
 303                          &state->encrypted_session_key,
 304                          &auth_flags)) {
 305                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 306                 dump_data(10, request.data, request.length);
 307
 308                 /* zero this out */
 309                 data_blob_free(&state->encrypted_session_key);
 310                 auth_flags = 0;
 311
 312                 /* Try again with a shorter string (Win9X truncates this packet) */
 313                 if (ntlmssp_state->unicode) {
 314                         parse_string = "CdBBUUU";
 315                 } else {
 316                         parse_string = "CdBBAAA";
 317                 }
 318
 319                 /* now the NTLMSSP encoded auth hashes */
 320                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 321                                  "NTLMSSP",
 322                                  &ntlmssp_command,
 323                                  &ntlmssp_state->lm_resp,
 324                                  &ntlmssp_state->nt_resp,
 325                                  &ntlmssp_state->domain,
 326                                  &ntlmssp_state->user,
 327                                  &ntlmssp_state->client.netbios_name)) {
 328                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 329                         dump_data(2, request.data, request.length);
 330
 331                         return NT_STATUS_INVALID_PARAMETER;
 332                 }
 333         }
 334
 335         talloc_steal(state, state->encrypted_session_key.data);
 336
 337         if (auth_flags != 0) {
 338                 nt_status = ntlmssp_handle_neg_flags(ntlmssp_state,
 339                                                      auth_flags,
 340                                                      "authenticate");
 341                 if (!NT_STATUS_IS_OK(nt_status)){
 342                         return nt_status;
 343                 }
 344         }
 345
 346         if (DEBUGLEVEL >= 10) {
 347                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 348                         ntlmssp_state, struct AUTHENTICATE_MESSAGE);
 349                 if (authenticate != NULL) {
 350                         NTSTATUS status;
 351                         authenticate->NegotiateFlags = auth_flags;
 352                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 353                                 &request, authenticate, authenticate);
 354                         if (NT_STATUS_IS_OK(status)) {
 355                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 356                                                 authenticate);
 357                         }
 358                         TALLOC_FREE(authenticate);
 359                 }
 360         }
 361
 362         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 363                  ntlmssp_state->user, ntlmssp_state->domain,
 364                  ntlmssp_state->client.netbios_name,
 365                  (unsigned long)ntlmssp_state->lm_resp.length,
 366                  (unsigned long)ntlmssp_state->nt_resp.length));
 367
 368 #if 0
 369         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 370         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 371 #endif
 372
 373         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 374            client challenge
 375
 376            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 377         */
 378         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 379                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 380                         MD5_CTX md5_session_nonce_ctx;
 381                         state->doing_ntlm2 = true;
 382
 383                         memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8);
 384                         memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 385
 386                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 387
 388                         MD5Init(&md5_session_nonce_ctx);
 389                         MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16);
 390                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 391
 392                         /* LM response is no longer useful */
 393                         data_blob_free(&ntlmssp_state->lm_resp);
 394
 395                         /* We changed the effective challenge - set it */
 396                         if (auth_context->set_ntlm_challenge) {
 397                                 nt_status = auth_context->set_ntlm_challenge(auth_context,
 398                                                                              session_nonce_hash,
 399                                                                              "NTLMSSP callback (NTLM2)");
 400                                 if (!NT_STATUS_IS_OK(nt_status)) {
 401                                         DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
 402                                                   nt_errstr(nt_status)));
 403                                         return nt_status;
 404                                 }
 405                         } else {
 406                                 DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't have facility for challenge to be set\n"));
 407
 408                                 return NT_STATUS_NOT_IMPLEMENTED;
 409                         }
 410
 411                         /* LM Key is incompatible. */
 412                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 413                 }
 414         }
 415         return NT_STATUS_OK;
 416 }
 417
 418 /**
 419  * Check the password on an NTLMSSP login.
 420  *
 421  * Return the session keys used on the connection.
 422  */
 423
 424 static NTSTATUS ntlmssp_server_check_password(struct gensec_security *gensec_security,
 425                                               struct gensec_ntlmssp_context *gensec_ntlmssp,
 426                                               TALLOC_CTX *mem_ctx,
 427                                               DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 428 {
 429         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 430         struct auth4_context *auth_context = gensec_security->auth_context;
 431         NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
 432         struct auth_usersupplied_info *user_info;
 433
 434         user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info);
 435         if (!user_info) {
 436                 return NT_STATUS_NO_MEMORY;
 437         }
 438
 439         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 440         user_info->flags = 0;
 441         user_info->mapped_state = false;
 442         user_info->client.account_name = ntlmssp_state->user;
 443         user_info->client.domain_name = ntlmssp_state->domain;
 444         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 445         user_info->remote_host = gensec_get_remote_address(gensec_security);
 446
 447         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 448         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 449         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 450         user_info->password.response.nt = ntlmssp_state->nt_resp;
 451         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 452
 453         if (auth_context->check_ntlm_password) {
 454                 nt_status = auth_context->check_ntlm_password(auth_context,
 455                                                               gensec_ntlmssp,
 456                                                               user_info,
 457                                                               &gensec_ntlmssp->server_returned_info,
 458                                                               user_session_key, lm_session_key);
 459         }
 460
 461         if (!NT_STATUS_IS_OK(nt_status)) {
 462                 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)));
 463         }
 464         TALLOC_FREE(user_info);
 465
 466         NT_STATUS_NOT_OK_RETURN(nt_status);
 467
 468         talloc_steal(mem_ctx, user_session_key->data);
 469         talloc_steal(mem_ctx, lm_session_key->data);
 470
 471         return nt_status;
 472 }
 473
 474 /**
 475  * Next state function for the Authenticate packet
 476  * (after authentication - figures out the session keys etc)
 477  *
 478  * @param ntlmssp_state NTLMSSP State
 479  * @return Errors or NT_STATUS_OK.
 480  */
 481
 482 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 483                                         struct gensec_ntlmssp_context *gensec_ntlmssp,
 484                                         struct ntlmssp_server_auth_state *state)
 485 {
 486         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 487         DATA_BLOB user_session_key = state->user_session_key;
 488         DATA_BLOB lm_session_key = state->lm_session_key;
 489         NTSTATUS nt_status = NT_STATUS_OK;
 490         DATA_BLOB session_key = data_blob(NULL, 0);
 491
 492         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 493         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 494
 495         /* Handle the different session key derivation for NTLM2 */
 496         if (state->doing_ntlm2) {
 497                 if (user_session_key.data && user_session_key.length == 16) {
 498                         session_key = data_blob_talloc(ntlmssp_state,
 499                                                        NULL, 16);
 500                         hmac_md5(user_session_key.data, state->session_nonce,
 501                                  sizeof(state->session_nonce), session_key.data);
 502                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 503                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 504
 505                 } else {
 506                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 507                         session_key = data_blob_null;
 508                 }
 509         } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 510                 /* Ensure we can never get here on NTLMv2 */
 511                 && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
 512
 513                 if (lm_session_key.data && lm_session_key.length >= 8) {
 514                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 515                                 session_key = data_blob_talloc(ntlmssp_state,
 516                                                                NULL, 16);
 517                                 if (session_key.data == NULL) {
 518                                         return NT_STATUS_NO_MEMORY;
 519                                 }
 520                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 521                                                           session_key.data);
 522                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 523                         } else {
 524                                 static const uint8_t zeros[24] = {0, };
 525                                 session_key = data_blob_talloc(
 526                                         ntlmssp_state, NULL, 16);
 527                                 if (session_key.data == NULL) {
 528                                         return NT_STATUS_NO_MEMORY;
 529                                 }
 530                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 531                                                           session_key.data);
 532                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 533                         }
 534                         dump_data_pw("LM session key:\n", session_key.data,
 535                                      session_key.length);
 536                 } else {
 537                         /* LM Key not selected */
 538                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 539
 540                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 541                         session_key = data_blob_null;
 542                 }
 543
 544         } else if (user_session_key.data) {
 545                 session_key = user_session_key;
 546                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 547                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 548
 549                 /* LM Key not selected */
 550                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 551
 552         } else if (lm_session_key.data) {
 553                 /* Very weird to have LM key, but no user session key, but anyway.. */
 554                 session_key = lm_session_key;
 555                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 556                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 557
 558                 /* LM Key not selected */
 559                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 560
 561         } else {
 562                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 563                 session_key = data_blob_null;
 564
 565                 /* LM Key not selected */
 566                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 567         }
 568
 569         /* With KEY_EXCH, the client supplies the proposed session key,
 570            but encrypts it with the long-term key */
 571         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 572                 if (!state->encrypted_session_key.data
 573                     || state->encrypted_session_key.length != 16) {
 574                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 575                                   (unsigned)state->encrypted_session_key.length));
 576                         return NT_STATUS_INVALID_PARAMETER;
 577                 } else if (!session_key.data || session_key.length != 16) {
 578                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 579                                   (unsigned int)session_key.length));
 580                         ntlmssp_state->session_key = session_key;
 581                         talloc_steal(ntlmssp_state, session_key.data);
 582                 } else {
 583                         dump_data_pw("KEY_EXCH session key (enc):\n",
 584                                      state->encrypted_session_key.data,
 585                                      state->encrypted_session_key.length);
 586                         arcfour_crypt(state->encrypted_session_key.data,
 587                                       session_key.data,
 588                                       state->encrypted_session_key.length);
 589                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 590                                                                       state->encrypted_session_key.data,
 591                                                                       state->encrypted_session_key.length);
 592                         dump_data_pw("KEY_EXCH session key:\n",
 593                                      state->encrypted_session_key.data,
 594                                      state->encrypted_session_key.length);
 595                 }
 596         } else {
 597                 ntlmssp_state->session_key = session_key;
 598                 talloc_steal(ntlmssp_state, session_key.data);
 599         }
 600
 601         if (gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 602                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 603         }
 604
 605         ntlmssp_state->expected_state = NTLMSSP_DONE;
 606
 607         return nt_status;
 608 }
 609
 610
 611 /**
 612  * Next state function for the NTLMSSP Authenticate packet
 613  *
 614  * @param gensec_security GENSEC state
 615  * @param out_mem_ctx Memory context for *out
 616  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 617  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 618  * @return Errors or NT_STATUS_OK if authentication sucessful
 619  */
 620
 621 NTSTATUS gensec_ntlmssp_server_auth(struct gensec_security *gensec_security,
 622                                     TALLOC_CTX *out_mem_ctx,
 623                                     const DATA_BLOB in, DATA_BLOB *out)
 624 {
 625         struct gensec_ntlmssp_context *gensec_ntlmssp =
 626                 talloc_get_type_abort(gensec_security->private_data,
 627                                       struct gensec_ntlmssp_context);
 628         struct ntlmssp_server_auth_state *state;
 629         NTSTATUS nt_status;
 630
 631         /* zero the outbound NTLMSSP packet */
 632         *out = data_blob_null;
 633
 634         state = talloc_zero(gensec_ntlmssp, struct ntlmssp_server_auth_state);
 635         if (state == NULL) {
 636                 return NT_STATUS_NO_MEMORY;
 637         }
 638
 639         nt_status = ntlmssp_server_preauth(gensec_security, gensec_ntlmssp, state, in);
 640         if (!NT_STATUS_IS_OK(nt_status)) {
 641                 TALLOC_FREE(state);
 642                 return nt_status;
 643         }
 644
 645         /*
 646          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 647          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 648          * smb.conf file) and no NTLMv2 response was sent then the password check
 649          * will fail here. JRA.
 650          */
 651
 652         /* Finally, actually ask if the password is OK */
 653         nt_status = ntlmssp_server_check_password(gensec_security, gensec_ntlmssp,
 654                                                   state,
 655                                                   &state->user_session_key,
 656                                                   &state->lm_session_key);
 657         if (!NT_STATUS_IS_OK(nt_status)) {
 658                 TALLOC_FREE(state);
 659                 return nt_status;
 660         }
 661
 662         /* When we get more async in the auth code behind
 663            ntlmssp_state->check_password, the ntlmssp_server_postpath
 664            can be done in a callback */
 665
 666         nt_status = ntlmssp_server_postauth(gensec_security, gensec_ntlmssp, state);
 667         TALLOC_FREE(state);
 668         return nt_status;
 669 }