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         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
 121
 122         /* Ask our caller what challenge they would like in the packet */
 123         if (auth_context->get_ntlm_challenge) {
 124                 status = auth_context->get_ntlm_challenge(auth_context, cryptkey);
 125                 if (!NT_STATUS_IS_OK(status)) {
 126                         DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
 127                                   nt_errstr(status)));
 128                         return status;
 129                 }
 130         } else {
 131                 DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
 132                 return NT_STATUS_NOT_IMPLEMENTED;
 133         }
 134
 135         /* The flags we send back are not just the negotiated flags,
 136          * they are also 'what is in this packet'.  Therfore, we
 137          * operate on 'chal_flags' from here on
 138          */
 139
 140         chal_flags = ntlmssp_state->neg_flags;
 141
 142         /* get the right name to fill in as 'target' */
 143         target_name = ntlmssp_target_name(ntlmssp_state,
 144                                           neg_flags, &chal_flags);
 145         if (target_name == NULL)
 146                 return NT_STATUS_INVALID_PARAMETER;
 147
 148         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 149         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 150                                                         cryptkey, 8);
 151
 152         /* This creates the 'blob' of names that appears at the end of the packet */
 153         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 154         {
 155                 status = msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 156                           MsvAvNbDomainName, target_name,
 157                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 158                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 159                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 160                           MsvAvEOL, "");
 161                 if (!NT_STATUS_IS_OK(status)) {
 162                         return status;
 163                 }
 164         } else {
 165                 struct_blob = data_blob_null;
 166         }
 167
 168         {
 169                 /* Marshal the packet in the right format, be it unicode or ASCII */
 170                 const char *gen_string;
 171                 DATA_BLOB version_blob = data_blob_null;
 172
 173                 if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) {
 174                         enum ndr_err_code err;
 175                         struct ntlmssp_VERSION vers;
 176
 177                         /* "What Windows returns" as a version number. */
 178                         ZERO_STRUCT(vers);
 179                         vers.ProductMajorVersion = NTLMSSP_WINDOWS_MAJOR_VERSION_6;
 180                         vers.ProductMinorVersion = NTLMSSP_WINDOWS_MINOR_VERSION_1;
 181                         vers.ProductBuild = 0;
 182                         vers.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
 183
 184                         err = ndr_push_struct_blob(&version_blob,
 185                                                 ntlmssp_state,
 186                                                 &vers,
 187                                                 (ndr_push_flags_fn_t)ndr_push_ntlmssp_VERSION);
 188
 189                         if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
 190                                 data_blob_free(&struct_blob);
 191                                 return NT_STATUS_NO_MEMORY;
 192                         }
 193                 }
 194
 195                 if (ntlmssp_state->unicode) {
 196                         gen_string = "CdUdbddBb";
 197                 } else {
 198                         gen_string = "CdAdbddBb";
 199                 }
 200
 201                 status = msrpc_gen(out_mem_ctx, reply, gen_string,
 202                         "NTLMSSP",
 203                         NTLMSSP_CHALLENGE,
 204                         target_name,
 205                         chal_flags,
 206                         cryptkey, 8,
 207                         0, 0,
 208                         struct_blob.data, struct_blob.length,
 209                         version_blob.data, version_blob.length);
 210
 211                 if (!NT_STATUS_IS_OK(status)) {
 212                         data_blob_free(&version_blob);
 213                         data_blob_free(&struct_blob);
 214                         return status;
 215                 }
 216
 217                 data_blob_free(&version_blob);
 218
 219                 if (DEBUGLEVEL >= 10) {
 220                         struct CHALLENGE_MESSAGE *challenge = talloc(
 221                                 ntlmssp_state, struct CHALLENGE_MESSAGE);
 222                         if (challenge != NULL) {
 223                                 challenge->NegotiateFlags = chal_flags;
 224                                 status = ntlmssp_pull_CHALLENGE_MESSAGE(
 225                                         reply, challenge, challenge);
 226                                 if (NT_STATUS_IS_OK(status)) {
 227                                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 228                                                         challenge);
 229                                 }
 230                                 TALLOC_FREE(challenge);
 231                         }
 232                 }
 233         }
 234
 235         data_blob_free(&struct_blob);
 236
 237         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 238
 239         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 240 }
 241
 242 struct ntlmssp_server_auth_state {
 243         DATA_BLOB user_session_key;
 244         DATA_BLOB lm_session_key;
 245         /* internal variables used by KEY_EXCH (client-supplied user session key */
 246         DATA_BLOB encrypted_session_key;
 247         bool doing_ntlm2;
 248         /* internal variables used by NTLM2 */
 249         uint8_t session_nonce[16];
 250 };
 251
 252 /**
 253  * Next state function for the Authenticate packet
 254  *
 255  * @param ntlmssp_state NTLMSSP State
 256  * @param request The request, as a DATA_BLOB
 257  * @return Errors or NT_STATUS_OK.
 258  */
 259
 260 static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security,
 261                                        struct gensec_ntlmssp_context *gensec_ntlmssp,
 262                                        struct ntlmssp_server_auth_state *state,
 263                                        const DATA_BLOB request)
 264 {
 265         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 266         struct auth4_context *auth_context = gensec_security->auth_context;
 267         uint32_t ntlmssp_command, auth_flags;
 268         NTSTATUS nt_status;
 269
 270         uint8_t session_nonce_hash[16];
 271
 272         const char *parse_string;
 273
 274 #if 0
 275         file_save("ntlmssp_auth.dat", request.data, request.length);
 276 #endif
 277
 278         if (ntlmssp_state->unicode) {
 279                 parse_string = "CdBBUUUBd";
 280         } else {
 281                 parse_string = "CdBBAAABd";
 282         }
 283
 284         /* zero these out */
 285         data_blob_free(&ntlmssp_state->session_key);
 286         data_blob_free(&ntlmssp_state->lm_resp);
 287         data_blob_free(&ntlmssp_state->nt_resp);
 288
 289         ntlmssp_state->user = NULL;
 290         ntlmssp_state->domain = NULL;
 291         ntlmssp_state->client.netbios_name = NULL;
 292
 293         /* now the NTLMSSP encoded auth hashes */
 294         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 295                          "NTLMSSP",
 296                          &ntlmssp_command,
 297                          &ntlmssp_state->lm_resp,
 298                          &ntlmssp_state->nt_resp,
 299                          &ntlmssp_state->domain,
 300                          &ntlmssp_state->user,
 301                          &ntlmssp_state->client.netbios_name,
 302                          &state->encrypted_session_key,
 303                          &auth_flags)) {
 304                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 305                 dump_data(10, request.data, request.length);
 306
 307                 /* zero this out */
 308                 data_blob_free(&state->encrypted_session_key);
 309                 auth_flags = 0;
 310
 311                 /* Try again with a shorter string (Win9X truncates this packet) */
 312                 if (ntlmssp_state->unicode) {
 313                         parse_string = "CdBBUUU";
 314                 } else {
 315                         parse_string = "CdBBAAA";
 316                 }
 317
 318                 /* now the NTLMSSP encoded auth hashes */
 319                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 320                                  "NTLMSSP",
 321                                  &ntlmssp_command,
 322                                  &ntlmssp_state->lm_resp,
 323                                  &ntlmssp_state->nt_resp,
 324                                  &ntlmssp_state->domain,
 325                                  &ntlmssp_state->user,
 326                                  &ntlmssp_state->client.netbios_name)) {
 327                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 328                         dump_data(2, request.data, request.length);
 329
 330                         return NT_STATUS_INVALID_PARAMETER;
 331                 }
 332         }
 333
 334         talloc_steal(state, state->encrypted_session_key.data);
 335
 336         if (auth_flags)
 337                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
 338
 339         if (DEBUGLEVEL >= 10) {
 340                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 341                         ntlmssp_state, struct AUTHENTICATE_MESSAGE);
 342                 if (authenticate != NULL) {
 343                         NTSTATUS status;
 344                         authenticate->NegotiateFlags = auth_flags;
 345                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 346                                 &request, authenticate, authenticate);
 347                         if (NT_STATUS_IS_OK(status)) {
 348                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 349                                                 authenticate);
 350                         }
 351                         TALLOC_FREE(authenticate);
 352                 }
 353         }
 354
 355         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 356                  ntlmssp_state->user, ntlmssp_state->domain,
 357                  ntlmssp_state->client.netbios_name,
 358                  (unsigned long)ntlmssp_state->lm_resp.length,
 359                  (unsigned long)ntlmssp_state->nt_resp.length));
 360
 361 #if 0
 362         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 363         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 364 #endif
 365
 366         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 367            client challenge
 368
 369            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 370         */
 371         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 372                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 373                         MD5_CTX md5_session_nonce_ctx;
 374                         state->doing_ntlm2 = true;
 375
 376                         memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8);
 377                         memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 378
 379                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 380
 381                         MD5Init(&md5_session_nonce_ctx);
 382                         MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16);
 383                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 384
 385                         /* LM response is no longer useful */
 386                         data_blob_free(&ntlmssp_state->lm_resp);
 387
 388                         /* We changed the effective challenge - set it */
 389                         if (auth_context->set_ntlm_challenge) {
 390                                 nt_status = auth_context->set_ntlm_challenge(auth_context,
 391                                                                              session_nonce_hash,
 392                                                                              "NTLMSSP callback (NTLM2)");
 393                                 if (!NT_STATUS_IS_OK(nt_status)) {
 394                                         DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
 395                                                   nt_errstr(nt_status)));
 396                                         return nt_status;
 397                                 }
 398                         } else {
 399                                 DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't have facility for challenge to be set\n"));
 400
 401                                 return NT_STATUS_NOT_IMPLEMENTED;
 402                         }
 403
 404                         /* LM Key is incompatible. */
 405                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 406                 }
 407         }
 408         return NT_STATUS_OK;
 409 }
 410
 411 /**
 412  * Check the password on an NTLMSSP login.
 413  *
 414  * Return the session keys used on the connection.
 415  */
 416
 417 static NTSTATUS ntlmssp_server_check_password(struct gensec_security *gensec_security,
 418                                               struct gensec_ntlmssp_context *gensec_ntlmssp,
 419                                               TALLOC_CTX *mem_ctx,
 420                                               DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 421 {
 422         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 423         struct auth4_context *auth_context = gensec_security->auth_context;
 424         NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
 425         struct auth_usersupplied_info *user_info;
 426
 427         user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info);
 428         if (!user_info) {
 429                 return NT_STATUS_NO_MEMORY;
 430         }
 431
 432         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 433         user_info->flags = 0;
 434         user_info->mapped_state = false;
 435         user_info->client.account_name = ntlmssp_state->user;
 436         user_info->client.domain_name = ntlmssp_state->domain;
 437         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 438         user_info->remote_host = gensec_get_remote_address(gensec_security);
 439
 440         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 441         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 442         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 443         user_info->password.response.nt = ntlmssp_state->nt_resp;
 444         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 445
 446         if (auth_context->check_ntlm_password) {
 447                 nt_status = auth_context->check_ntlm_password(auth_context,
 448                                                               gensec_ntlmssp,
 449                                                               user_info,
 450                                                               &gensec_ntlmssp->server_returned_info,
 451                                                               user_session_key, lm_session_key);
 452         }
 453
 454         if (!NT_STATUS_IS_OK(nt_status)) {
 455                 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)));
 456         }
 457         TALLOC_FREE(user_info);
 458
 459         NT_STATUS_NOT_OK_RETURN(nt_status);
 460
 461         talloc_steal(mem_ctx, user_session_key->data);
 462         talloc_steal(mem_ctx, lm_session_key->data);
 463
 464         return nt_status;
 465 }
 466
 467 /**
 468  * Next state function for the Authenticate packet
 469  * (after authentication - figures out the session keys etc)
 470  *
 471  * @param ntlmssp_state NTLMSSP State
 472  * @return Errors or NT_STATUS_OK.
 473  */
 474
 475 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 476                                         struct gensec_ntlmssp_context *gensec_ntlmssp,
 477                                         struct ntlmssp_server_auth_state *state)
 478 {
 479         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 480         DATA_BLOB user_session_key = state->user_session_key;
 481         DATA_BLOB lm_session_key = state->lm_session_key;
 482         NTSTATUS nt_status = NT_STATUS_OK;
 483         DATA_BLOB session_key = data_blob(NULL, 0);
 484
 485         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 486         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 487
 488         /* Handle the different session key derivation for NTLM2 */
 489         if (state->doing_ntlm2) {
 490                 if (user_session_key.data && user_session_key.length == 16) {
 491                         session_key = data_blob_talloc(ntlmssp_state,
 492                                                        NULL, 16);
 493                         hmac_md5(user_session_key.data, state->session_nonce,
 494                                  sizeof(state->session_nonce), session_key.data);
 495                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 496                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 497
 498                 } else {
 499                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 500                         session_key = data_blob_null;
 501                 }
 502         } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 503                 /* Ensure we can never get here on NTLMv2 */
 504                 && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
 505
 506                 if (lm_session_key.data && lm_session_key.length >= 8) {
 507                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 508                                 session_key = data_blob_talloc(ntlmssp_state,
 509                                                                NULL, 16);
 510                                 if (session_key.data == NULL) {
 511                                         return NT_STATUS_NO_MEMORY;
 512                                 }
 513                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 514                                                           session_key.data);
 515                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 516                         } else {
 517                                 static const uint8_t zeros[24] = {0, };
 518                                 session_key = data_blob_talloc(
 519                                         ntlmssp_state, NULL, 16);
 520                                 if (session_key.data == NULL) {
 521                                         return NT_STATUS_NO_MEMORY;
 522                                 }
 523                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 524                                                           session_key.data);
 525                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 526                         }
 527                         dump_data_pw("LM session key:\n", session_key.data,
 528                                      session_key.length);
 529                 } else {
 530                         /* LM Key not selected */
 531                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 532
 533                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 534                         session_key = data_blob_null;
 535                 }
 536
 537         } else if (user_session_key.data) {
 538                 session_key = user_session_key;
 539                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 540                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 541
 542                 /* LM Key not selected */
 543                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 544
 545         } else if (lm_session_key.data) {
 546                 /* Very weird to have LM key, but no user session key, but anyway.. */
 547                 session_key = lm_session_key;
 548                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 549                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 550
 551                 /* LM Key not selected */
 552                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 553
 554         } else {
 555                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 556                 session_key = data_blob_null;
 557
 558                 /* LM Key not selected */
 559                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 560         }
 561
 562         /* With KEY_EXCH, the client supplies the proposed session key,
 563            but encrypts it with the long-term key */
 564         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 565                 if (!state->encrypted_session_key.data
 566                     || state->encrypted_session_key.length != 16) {
 567                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 568                                   (unsigned)state->encrypted_session_key.length));
 569                         return NT_STATUS_INVALID_PARAMETER;
 570                 } else if (!session_key.data || session_key.length != 16) {
 571                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 572                                   (unsigned int)session_key.length));
 573                         ntlmssp_state->session_key = session_key;
 574                         talloc_steal(ntlmssp_state, session_key.data);
 575                 } else {
 576                         dump_data_pw("KEY_EXCH session key (enc):\n",
 577                                      state->encrypted_session_key.data,
 578                                      state->encrypted_session_key.length);
 579                         arcfour_crypt(state->encrypted_session_key.data,
 580                                       session_key.data,
 581                                       state->encrypted_session_key.length);
 582                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 583                                                                       state->encrypted_session_key.data,
 584                                                                       state->encrypted_session_key.length);
 585                         dump_data_pw("KEY_EXCH session key:\n",
 586                                      state->encrypted_session_key.data,
 587                                      state->encrypted_session_key.length);
 588                 }
 589         } else {
 590                 ntlmssp_state->session_key = session_key;
 591                 talloc_steal(ntlmssp_state, session_key.data);
 592         }
 593
 594         if (ntlmssp_state->session_key.length) {
 595                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 596         }
 597
 598         ntlmssp_state->expected_state = NTLMSSP_DONE;
 599
 600         return nt_status;
 601 }
 602
 603
 604 /**
 605  * Next state function for the NTLMSSP Authenticate packet
 606  *
 607  * @param gensec_security GENSEC state
 608  * @param out_mem_ctx Memory context for *out
 609  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 610  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 611  * @return Errors or NT_STATUS_OK if authentication sucessful
 612  */
 613
 614 NTSTATUS gensec_ntlmssp_server_auth(struct gensec_security *gensec_security,
 615                                     TALLOC_CTX *out_mem_ctx,
 616                                     const DATA_BLOB in, DATA_BLOB *out)
 617 {
 618         struct gensec_ntlmssp_context *gensec_ntlmssp =
 619                 talloc_get_type_abort(gensec_security->private_data,
 620                                       struct gensec_ntlmssp_context);
 621         struct ntlmssp_server_auth_state *state;
 622         NTSTATUS nt_status;
 623
 624         /* zero the outbound NTLMSSP packet */
 625         *out = data_blob_null;
 626
 627         state = talloc_zero(gensec_ntlmssp, struct ntlmssp_server_auth_state);
 628         if (state == NULL) {
 629                 return NT_STATUS_NO_MEMORY;
 630         }
 631
 632         nt_status = ntlmssp_server_preauth(gensec_security, gensec_ntlmssp, state, in);
 633         if (!NT_STATUS_IS_OK(nt_status)) {
 634                 TALLOC_FREE(state);
 635                 return nt_status;
 636         }
 637
 638         /*
 639          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 640          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 641          * smb.conf file) and no NTLMv2 response was sent then the password check
 642          * will fail here. JRA.
 643          */
 644
 645         /* Finally, actually ask if the password is OK */
 646         nt_status = ntlmssp_server_check_password(gensec_security, gensec_ntlmssp,
 647                                                   state,
 648                                                   &state->user_session_key,
 649                                                   &state->lm_session_key);
 650         if (!NT_STATUS_IS_OK(nt_status)) {
 651                 TALLOC_FREE(state);
 652                 return nt_status;
 653         }
 654
 655         /* When we get more async in the auth code behind
 656            ntlmssp_state->check_password, the ntlmssp_server_postpath
 657            can be done in a callback */
 658
 659         nt_status = ntlmssp_server_postauth(gensec_security, gensec_ntlmssp, state);
 660         TALLOC_FREE(state);
 661         return nt_status;
 662 }