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/common_auth.h"
  32
  33 /**
  34  * Determine correct target name flags for reply, given server role
  35  * and negotiated flags
  36  *
  37  * @param ntlmssp_state NTLMSSP State
  38  * @param neg_flags The flags from the packet
  39  * @param chal_flags The flags to be set in the reply packet
  40  * @return The 'target name' string.
  41  */
  42
  43 const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
  44                                 uint32_t neg_flags, uint32_t *chal_flags)
  45 {
  46         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  47                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
  48                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  49                 if (ntlmssp_state->server.is_standalone) {
  50                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  51                         return ntlmssp_state->server.netbios_name;
  52                 } else {
  53                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
  54                         return ntlmssp_state->server.netbios_domain;
  55                 };
  56         } else {
  57                 return "";
  58         }
  59 }
  60
  61 /**
  62  * Next state function for the NTLMSSP Negotiate packet
  63  *
  64  * @param gensec_security GENSEC state
  65  * @param out_mem_ctx Memory context for *out
  66  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  67  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  68  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
  69  */
  70
  71 NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
  72                                          TALLOC_CTX *out_mem_ctx,
  73                                          const DATA_BLOB request, DATA_BLOB *reply)
  74 {
  75         struct gensec_ntlmssp_context *gensec_ntlmssp =
  76                 talloc_get_type_abort(gensec_security->private_data,
  77                                       struct gensec_ntlmssp_context);
  78         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  79         struct auth4_context *auth_context = gensec_security->auth_context;
  80         DATA_BLOB struct_blob;
  81         uint32_t neg_flags = 0;
  82         uint32_t ntlmssp_command, chal_flags;
  83         uint8_t cryptkey[8];
  84         const char *target_name;
  85         NTSTATUS status;
  86
  87         /* parse the NTLMSSP packet */
  88 #if 0
  89         file_save("ntlmssp_negotiate.dat", request.data, request.length);
  90 #endif
  91
  92         if (request.length) {
  93                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
  94                                                           "NTLMSSP",
  95                                                           &ntlmssp_command,
  96                                                           &neg_flags)) {
  97                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
  98                                 (unsigned int)request.length));
  99                         dump_data(2, request.data, request.length);
 100                         return NT_STATUS_INVALID_PARAMETER;
 101                 }
 102                 debug_ntlmssp_flags(neg_flags);
 103
 104                 if (DEBUGLEVEL >= 10) {
 105                         struct NEGOTIATE_MESSAGE *negotiate = talloc(
 106                                 ntlmssp_state, struct NEGOTIATE_MESSAGE);
 107                         if (negotiate != NULL) {
 108                                 status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 109                                         &request, negotiate, negotiate);
 110                                 if (NT_STATUS_IS_OK(status)) {
 111                                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 112                                                         negotiate);
 113                                 }
 114                                 TALLOC_FREE(negotiate);
 115                         }
 116                 }
 117         }
 118
 119         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
 120
 121         /* Ask our caller what challenge they would like in the packet */
 122         if (auth_context->get_ntlm_challenge) {
 123                 status = auth_context->get_ntlm_challenge(auth_context, cryptkey);
 124                 if (!NT_STATUS_IS_OK(status)) {
 125                         DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
 126                                   nt_errstr(status)));
 127                         return status;
 128                 }
 129         } else {
 130                 DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
 131                 return NT_STATUS_NOT_IMPLEMENTED;
 132         }
 133
 134         /* Check if we may set the challenge */
 135         if (auth_context->challenge_may_be_modified) {
 136                 if (!auth_context->challenge_may_be_modified(auth_context)) {
 137                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 138                 }
 139         }
 140
 141         /* The flags we send back are not just the negotiated flags,
 142          * they are also 'what is in this packet'.  Therfore, we
 143          * operate on 'chal_flags' from here on
 144          */
 145
 146         chal_flags = ntlmssp_state->neg_flags;
 147
 148         /* get the right name to fill in as 'target' */
 149         target_name = ntlmssp_target_name(ntlmssp_state,
 150                                           neg_flags, &chal_flags);
 151         if (target_name == NULL)
 152                 return NT_STATUS_INVALID_PARAMETER;
 153
 154         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 155         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 156                                                         cryptkey, 8);
 157
 158         /* This creates the 'blob' of names that appears at the end of the packet */
 159         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 160         {
 161                 status = msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 162                           MsvAvNbDomainName, target_name,
 163                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 164                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 165                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 166                           MsvAvEOL, "");
 167                 if (!NT_STATUS_IS_OK(status)) {
 168                         return status;
 169                 }
 170         } else {
 171                 struct_blob = data_blob_null;
 172         }
 173
 174         {
 175                 /* Marshal the packet in the right format, be it unicode or ASCII */
 176                 const char *gen_string;
 177                 DATA_BLOB version_blob = data_blob_null;
 178
 179                 if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) {
 180                         enum ndr_err_code err;
 181                         struct ntlmssp_VERSION vers;
 182
 183                         /* "What Windows returns" as a version number. */
 184                         ZERO_STRUCT(vers);
 185                         vers.ProductMajorVersion = NTLMSSP_WINDOWS_MAJOR_VERSION_6;
 186                         vers.ProductMinorVersion = NTLMSSP_WINDOWS_MINOR_VERSION_1;
 187                         vers.ProductBuild = 0;
 188                         vers.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
 189
 190                         err = ndr_push_struct_blob(&version_blob,
 191                                                 ntlmssp_state,
 192                                                 &vers,
 193                                                 (ndr_push_flags_fn_t)ndr_push_ntlmssp_VERSION);
 194
 195                         if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
 196                                 data_blob_free(&struct_blob);
 197                                 return NT_STATUS_NO_MEMORY;
 198                         }
 199                 }
 200
 201                 if (ntlmssp_state->unicode) {
 202                         gen_string = "CdUdbddBb";
 203                 } else {
 204                         gen_string = "CdAdbddBb";
 205                 }
 206
 207                 status = msrpc_gen(out_mem_ctx, reply, gen_string,
 208                         "NTLMSSP",
 209                         NTLMSSP_CHALLENGE,
 210                         target_name,
 211                         chal_flags,
 212                         cryptkey, 8,
 213                         0, 0,
 214                         struct_blob.data, struct_blob.length,
 215                         version_blob.data, version_blob.length);
 216
 217                 if (!NT_STATUS_IS_OK(status)) {
 218                         data_blob_free(&version_blob);
 219                         data_blob_free(&struct_blob);
 220                         return status;
 221                 }
 222
 223                 data_blob_free(&version_blob);
 224
 225                 if (DEBUGLEVEL >= 10) {
 226                         struct CHALLENGE_MESSAGE *challenge = talloc(
 227                                 ntlmssp_state, struct CHALLENGE_MESSAGE);
 228                         if (challenge != NULL) {
 229                                 challenge->NegotiateFlags = chal_flags;
 230                                 status = ntlmssp_pull_CHALLENGE_MESSAGE(
 231                                         reply, challenge, challenge);
 232                                 if (NT_STATUS_IS_OK(status)) {
 233                                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 234                                                         challenge);
 235                                 }
 236                                 TALLOC_FREE(challenge);
 237                         }
 238                 }
 239         }
 240
 241         data_blob_free(&struct_blob);
 242
 243         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 244
 245         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 246 }
 247
 248 struct ntlmssp_server_auth_state {
 249         DATA_BLOB user_session_key;
 250         DATA_BLOB lm_session_key;
 251         /* internal variables used by KEY_EXCH (client-supplied user session key */
 252         DATA_BLOB encrypted_session_key;
 253         bool doing_ntlm2;
 254         /* internal variables used by NTLM2 */
 255         uint8_t session_nonce[16];
 256 };
 257
 258 /**
 259  * Next state function for the Authenticate packet
 260  *
 261  * @param ntlmssp_state NTLMSSP State
 262  * @param request The request, as a DATA_BLOB
 263  * @return Errors or NT_STATUS_OK.
 264  */
 265
 266 static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security,
 267                                        struct gensec_ntlmssp_context *gensec_ntlmssp,
 268                                        struct ntlmssp_server_auth_state *state,
 269                                        const DATA_BLOB request)
 270 {
 271         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 272         struct auth4_context *auth_context = gensec_security->auth_context;
 273         uint32_t ntlmssp_command, auth_flags;
 274         NTSTATUS nt_status;
 275
 276         uint8_t session_nonce_hash[16];
 277
 278         const char *parse_string;
 279
 280 #if 0
 281         file_save("ntlmssp_auth.dat", request.data, request.length);
 282 #endif
 283
 284         if (ntlmssp_state->unicode) {
 285                 parse_string = "CdBBUUUBd";
 286         } else {
 287                 parse_string = "CdBBAAABd";
 288         }
 289
 290         /* zero these out */
 291         data_blob_free(&ntlmssp_state->session_key);
 292         data_blob_free(&ntlmssp_state->lm_resp);
 293         data_blob_free(&ntlmssp_state->nt_resp);
 294
 295         ntlmssp_state->user = NULL;
 296         ntlmssp_state->domain = NULL;
 297         ntlmssp_state->client.netbios_name = NULL;
 298
 299         /* now the NTLMSSP encoded auth hashes */
 300         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 301                          "NTLMSSP",
 302                          &ntlmssp_command,
 303                          &ntlmssp_state->lm_resp,
 304                          &ntlmssp_state->nt_resp,
 305                          &ntlmssp_state->domain,
 306                          &ntlmssp_state->user,
 307                          &ntlmssp_state->client.netbios_name,
 308                          &state->encrypted_session_key,
 309                          &auth_flags)) {
 310                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 311                 dump_data(10, request.data, request.length);
 312
 313                 /* zero this out */
 314                 data_blob_free(&state->encrypted_session_key);
 315                 auth_flags = 0;
 316
 317                 /* Try again with a shorter string (Win9X truncates this packet) */
 318                 if (ntlmssp_state->unicode) {
 319                         parse_string = "CdBBUUU";
 320                 } else {
 321                         parse_string = "CdBBAAA";
 322                 }
 323
 324                 /* now the NTLMSSP encoded auth hashes */
 325                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 326                                  "NTLMSSP",
 327                                  &ntlmssp_command,
 328                                  &ntlmssp_state->lm_resp,
 329                                  &ntlmssp_state->nt_resp,
 330                                  &ntlmssp_state->domain,
 331                                  &ntlmssp_state->user,
 332                                  &ntlmssp_state->client.netbios_name)) {
 333                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 334                         dump_data(2, request.data, request.length);
 335
 336                         return NT_STATUS_INVALID_PARAMETER;
 337                 }
 338         }
 339
 340         talloc_steal(state, state->encrypted_session_key.data);
 341
 342         if (auth_flags)
 343                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
 344
 345         if (DEBUGLEVEL >= 10) {
 346                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 347                         ntlmssp_state, struct AUTHENTICATE_MESSAGE);
 348                 if (authenticate != NULL) {
 349                         NTSTATUS status;
 350                         authenticate->NegotiateFlags = auth_flags;
 351                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 352                                 &request, authenticate, authenticate);
 353                         if (NT_STATUS_IS_OK(status)) {
 354                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 355                                                 authenticate);
 356                         }
 357                         TALLOC_FREE(authenticate);
 358                 }
 359         }
 360
 361         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 362                  ntlmssp_state->user, ntlmssp_state->domain,
 363                  ntlmssp_state->client.netbios_name,
 364                  (unsigned long)ntlmssp_state->lm_resp.length,
 365                  (unsigned long)ntlmssp_state->nt_resp.length));
 366
 367 #if 0
 368         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 369         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 370 #endif
 371
 372         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 373            client challenge
 374
 375            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 376         */
 377         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 378                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 379                         struct MD5Context md5_session_nonce_ctx;
 380                         state->doing_ntlm2 = true;
 381
 382                         memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8);
 383                         memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 384
 385                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 386
 387                         MD5Init(&md5_session_nonce_ctx);
 388                         MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16);
 389                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 390
 391                         /* LM response is no longer useful */
 392                         data_blob_free(&ntlmssp_state->lm_resp);
 393
 394                         /* We changed the effective challenge - set it */
 395                         if (auth_context->set_ntlm_challenge) {
 396                                 nt_status = auth_context->set_ntlm_challenge(auth_context,
 397                                                                              session_nonce_hash,
 398                                                                              "NTLMSSP callback (NTLM2)");
 399                                 if (!NT_STATUS_IS_OK(nt_status)) {
 400                                         DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
 401                                                   nt_errstr(nt_status)));
 402                                         return nt_status;
 403                                 }
 404                         } else {
 405                                 DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't have facility for challenge to be set\n"));
 406
 407                                 return NT_STATUS_NOT_IMPLEMENTED;
 408                         }
 409
 410                         /* LM Key is incompatible. */
 411                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 412                 }
 413         }
 414         return NT_STATUS_OK;
 415 }
 416
 417 /**
 418  * Check the password on an NTLMSSP login.
 419  *
 420  * Return the session keys used on the connection.
 421  */
 422
 423 static NTSTATUS ntlmssp_server_check_password(struct gensec_security *gensec_security,
 424                                               struct gensec_ntlmssp_context *gensec_ntlmssp,
 425                                               TALLOC_CTX *mem_ctx,
 426                                               DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 427 {
 428         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 429         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 430         NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
 431         struct auth_usersupplied_info *user_info;
 432
 433         user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info);
 434         if (!user_info) {
 435                 return NT_STATUS_NO_MEMORY;
 436         }
 437
 438         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 439         user_info->flags = 0;
 440         user_info->mapped_state = false;
 441         user_info->client.account_name = ntlmssp_state->user;
 442         user_info->client.domain_name = ntlmssp_state->domain;
 443         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 444         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 445
 446         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 447         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 448         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 449         user_info->password.response.nt = ntlmssp_state->nt_resp;
 450         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 451
 452         if (auth_context->check_ntlm_password) {
 453                 nt_status = auth_context->check_ntlm_password(auth_context,
 454                                                               gensec_ntlmssp,
 455                                                               user_info,
 456                                                               &gensec_ntlmssp->server_returned_info,
 457                                                               user_session_key, lm_session_key);
 458         }
 459         talloc_free(user_info);
 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
 465         NT_STATUS_NOT_OK_RETURN(nt_status);
 466
 467         talloc_steal(mem_ctx, user_session_key->data);
 468         talloc_steal(mem_ctx, lm_session_key->data);
 469
 470         return nt_status;
 471 }
 472
 473 /**
 474  * Next state function for the Authenticate packet
 475  * (after authentication - figures out the session keys etc)
 476  *
 477  * @param ntlmssp_state NTLMSSP State
 478  * @return Errors or NT_STATUS_OK.
 479  */
 480
 481 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 482                                         struct gensec_ntlmssp_context *gensec_ntlmssp,
 483                                         struct ntlmssp_server_auth_state *state)
 484 {
 485         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 486         DATA_BLOB user_session_key = state->user_session_key;
 487         DATA_BLOB lm_session_key = state->lm_session_key;
 488         NTSTATUS nt_status = NT_STATUS_OK;
 489         DATA_BLOB session_key = data_blob(NULL, 0);
 490
 491         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 492         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 493
 494         /* Handle the different session key derivation for NTLM2 */
 495         if (state->doing_ntlm2) {
 496                 if (user_session_key.data && user_session_key.length == 16) {
 497                         session_key = data_blob_talloc(ntlmssp_state,
 498                                                        NULL, 16);
 499                         hmac_md5(user_session_key.data, state->session_nonce,
 500                                  sizeof(state->session_nonce), session_key.data);
 501                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 502                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 503
 504                 } else {
 505                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 506                         session_key = data_blob_null;
 507                 }
 508         } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 509                 /* Ensure we can never get here on NTLMv2 */
 510                 && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
 511
 512                 if (lm_session_key.data && lm_session_key.length >= 8) {
 513                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 514                                 session_key = data_blob_talloc(ntlmssp_state,
 515                                                                NULL, 16);
 516                                 if (session_key.data == NULL) {
 517                                         return NT_STATUS_NO_MEMORY;
 518                                 }
 519                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 520                                                           session_key.data);
 521                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 522                         } else {
 523                                 static const uint8_t zeros[24] = {0, };
 524                                 session_key = data_blob_talloc(
 525                                         ntlmssp_state, NULL, 16);
 526                                 if (session_key.data == NULL) {
 527                                         return NT_STATUS_NO_MEMORY;
 528                                 }
 529                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 530                                                           session_key.data);
 531                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 532                         }
 533                         dump_data_pw("LM session key:\n", session_key.data,
 534                                      session_key.length);
 535                 } else {
 536                         /* LM Key not selected */
 537                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 538
 539                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 540                         session_key = data_blob_null;
 541                 }
 542
 543         } else if (user_session_key.data) {
 544                 session_key = user_session_key;
 545                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 546                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 547
 548                 /* LM Key not selected */
 549                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 550
 551         } else if (lm_session_key.data) {
 552                 /* Very weird to have LM key, but no user session key, but anyway.. */
 553                 session_key = lm_session_key;
 554                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 555                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 556
 557                 /* LM Key not selected */
 558                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 559
 560         } else {
 561                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 562                 session_key = data_blob_null;
 563
 564                 /* LM Key not selected */
 565                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 566         }
 567
 568         /* With KEY_EXCH, the client supplies the proposed session key,
 569            but encrypts it with the long-term key */
 570         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 571                 if (!state->encrypted_session_key.data
 572                     || state->encrypted_session_key.length != 16) {
 573                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 574                                   (unsigned)state->encrypted_session_key.length));
 575                         return NT_STATUS_INVALID_PARAMETER;
 576                 } else if (!session_key.data || session_key.length != 16) {
 577                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 578                                   (unsigned int)session_key.length));
 579                         ntlmssp_state->session_key = session_key;
 580                         talloc_steal(ntlmssp_state, session_key.data);
 581                 } else {
 582                         dump_data_pw("KEY_EXCH session key (enc):\n",
 583                                      state->encrypted_session_key.data,
 584                                      state->encrypted_session_key.length);
 585                         arcfour_crypt(state->encrypted_session_key.data,
 586                                       session_key.data,
 587                                       state->encrypted_session_key.length);
 588                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 589                                                                       state->encrypted_session_key.data,
 590                                                                       state->encrypted_session_key.length);
 591                         dump_data_pw("KEY_EXCH session key:\n",
 592                                      state->encrypted_session_key.data,
 593                                      state->encrypted_session_key.length);
 594                 }
 595         } else {
 596                 ntlmssp_state->session_key = session_key;
 597                 talloc_steal(ntlmssp_state, session_key.data);
 598         }
 599
 600         if (ntlmssp_state->session_key.length) {
 601                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 602         }
 603
 604         ntlmssp_state->expected_state = NTLMSSP_DONE;
 605
 606         return nt_status;
 607 }
 608
 609
 610 /**
 611  * Next state function for the NTLMSSP Authenticate packet
 612  *
 613  * @param gensec_security GENSEC state
 614  * @param out_mem_ctx Memory context for *out
 615  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 616  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 617  * @return Errors or NT_STATUS_OK if authentication sucessful
 618  */
 619
 620 NTSTATUS gensec_ntlmssp_server_auth(struct gensec_security *gensec_security,
 621                                     TALLOC_CTX *out_mem_ctx,
 622                                     const DATA_BLOB in, DATA_BLOB *out)
 623 {
 624         struct gensec_ntlmssp_context *gensec_ntlmssp =
 625                 talloc_get_type_abort(gensec_security->private_data,
 626                                       struct gensec_ntlmssp_context);
 627         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 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(ntlmssp_state, 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                 DEBUG(5,("%s: Checking NTLMSSP password for %s\\%s failed: %s\n",
 659                          __location__,
 660                          ntlmssp_state->domain, ntlmssp_state->user,
 661                          nt_errstr(nt_status)));
 662                 TALLOC_FREE(state);
 663                 return nt_status;
 664         }
 665
 666         /* When we get more async in the auth code behind
 667            ntlmssp_state->check_password, the ntlmssp_server_postpath
 668            can be done in a callback */
 669
 670         nt_status = ntlmssp_server_postauth(gensec_security, gensec_ntlmssp, state);
 671         TALLOC_FREE(state);
 672         return nt_status;
 673 }