source4/auth/ntlmssp/ntlmssp_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, client server side parsing
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/network.h"
  26 #include "lib/tsocket/tsocket.h"
  27 #include "auth/ntlmssp/ntlmssp.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_proto.h"
  32 #include "auth/auth.h"
  33 #include "param/param.h"
  34
  35 /**
  36  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  37  *
  38  */
  39
  40 static NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
  41 {
  42         if (!user) {
  43                 /* it should be at least "" */
  44                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  45                 return NT_STATUS_INVALID_PARAMETER;
  46         }
  47         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user);
  48         if (!ntlmssp_state->user) {
  49                 return NT_STATUS_NO_MEMORY;
  50         }
  51         return NT_STATUS_OK;
  52 }
  53
  54 /**
  55  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  56  *
  57  */
  58 static NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
  59 {
  60         ntlmssp_state->domain = talloc_strdup(ntlmssp_state, domain);
  61         if (!ntlmssp_state->domain) {
  62                 return NT_STATUS_NO_MEMORY;
  63         }
  64         return NT_STATUS_OK;
  65 }
  66
  67 /**
  68  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  69  *
  70  */
  71 static NTSTATUS ntlmssp_set_workstation(struct ntlmssp_state *ntlmssp_state, const char *workstation)
  72 {
  73         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state, workstation);
  74         if (!ntlmssp_state->workstation) {
  75                 return NT_STATUS_NO_MEMORY;
  76         }
  77         return NT_STATUS_OK;
  78 }
  79
  80 /**
  81  * Determine correct target name flags for reply, given server role
  82  * and negotiated flags
  83  *
  84  * @param ntlmssp_state NTLMSSP State
  85  * @param neg_flags The flags from the packet
  86  * @param chal_flags The flags to be set in the reply packet
  87  * @return The 'target name' string.
  88  */
  89
  90 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
  91                                        uint32_t neg_flags, uint32_t *chal_flags)
  92 {
  93         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  94                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
  95                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  96                 if (ntlmssp_state->server.is_standalone) {
  97                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  98                         return ntlmssp_state->server.netbios_name;
  99                 } else {
 100                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 101                         return ntlmssp_state->server.netbios_domain;
 102                 };
 103         } else {
 104                 return "";
 105         }
 106 }
 107
 108
 109
 110 /**
 111  * Next state function for the Negotiate packet
 112  *
 113  * @param gensec_security GENSEC state
 114  * @param out_mem_ctx Memory context for *out
 115  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 116  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 117  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 118  */
 119
 120 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 121                                   TALLOC_CTX *out_mem_ctx,
 122                                   const DATA_BLOB in, DATA_BLOB *out)
 123 {
 124         struct gensec_ntlmssp_context *gensec_ntlmssp =
 125                 talloc_get_type_abort(gensec_security->private_data,
 126                                       struct gensec_ntlmssp_context);
 127         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 128         DATA_BLOB struct_blob;
 129         uint32_t neg_flags = 0;
 130         uint32_t ntlmssp_command, chal_flags;
 131         uint8_t cryptkey[8];
 132         const char *target_name;
 133         NTSTATUS status;
 134
 135         /* parse the NTLMSSP packet */
 136 #if 0
 137         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 138 #endif
 139
 140         if (in.length) {
 141                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx,
 142                                                          &in, "Cdd",
 143                                                          "NTLMSSP",
 144                                                          &ntlmssp_command,
 145                                                          &neg_flags)) {
 146                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 147                                 "NTLMSSP Negotiate of length %u:\n",
 148                                 (unsigned int)in.length ));
 149                         dump_data(2, in.data, in.length);
 150                         return NT_STATUS_INVALID_PARAMETER;
 151                 }
 152                 debug_ntlmssp_flags(neg_flags);
 153         }
 154
 155         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
 156
 157         /* Ask our caller what challenge they would like in the packet */
 158         status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 159         if (!NT_STATUS_IS_OK(status)) {
 160                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge: %s\n",
 161                           nt_errstr(status)));
 162                 return status;
 163         }
 164
 165         /* Check if we may set the challenge */
 166         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 167                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 168         }
 169
 170         /* The flags we send back are not just the negotiated flags,
 171          * they are also 'what is in this packet'.  Therfore, we
 172          * operate on 'chal_flags' from here on
 173          */
 174
 175         chal_flags = ntlmssp_state->neg_flags;
 176
 177         /* get the right name to fill in as 'target' */
 178         target_name = ntlmssp_target_name(ntlmssp_state,
 179                                           neg_flags, &chal_flags);
 180         if (target_name == NULL)
 181                 return NT_STATUS_INVALID_PARAMETER;
 182
 183         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 184         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 185
 186         /* This creates the 'blob' of names that appears at the end of the packet */
 187         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 188                 msrpc_gen(out_mem_ctx,
 189                           &struct_blob, "aaaaa",
 190                           MsvAvNbDomainName, target_name,
 191                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 192                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 193                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 194                           MsvAvEOL, "");
 195         } else {
 196                 struct_blob = data_blob(NULL, 0);
 197         }
 198
 199         {
 200                 /* Marshal the packet in the right format, be it unicode or ASCII */
 201                 const char *gen_string;
 202                 if (ntlmssp_state->unicode) {
 203                         gen_string = "CdUdbddB";
 204                 } else {
 205                         gen_string = "CdAdbddB";
 206                 }
 207
 208                 msrpc_gen(out_mem_ctx,
 209                           out, gen_string,
 210                           "NTLMSSP",
 211                           NTLMSSP_CHALLENGE,
 212                           target_name,
 213                           chal_flags,
 214                           cryptkey, 8,
 215                           0, 0,
 216                           struct_blob.data, struct_blob.length);
 217         }
 218
 219         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 220
 221         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 222 }
 223
 224 struct ntlmssp_server_auth_state {
 225         DATA_BLOB user_session_key;
 226         DATA_BLOB lm_session_key;
 227         /* internal variables used by KEY_EXCH (client-supplied user session key */
 228         DATA_BLOB encrypted_session_key;
 229         bool doing_ntlm2;
 230         /* internal variables used by NTLM2 */
 231         uint8_t session_nonce[16];
 232 };
 233
 234 /**
 235  * Next state function for the Authenticate packet
 236  *
 237  * @param ntlmssp_state NTLMSSP State
 238  * @param request The request, as a DATA_BLOB
 239  * @return Errors or NT_STATUS_OK.
 240  */
 241
 242 static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
 243                                        struct ntlmssp_server_auth_state *state,
 244                                        const DATA_BLOB request)
 245 {
 246         uint32_t ntlmssp_command, auth_flags;
 247         NTSTATUS nt_status;
 248
 249         uint8_t session_nonce_hash[16];
 250
 251         const char *parse_string;
 252         char *domain = NULL;
 253         char *user = NULL;
 254         char *workstation = NULL;
 255
 256 #if 0
 257         file_save("ntlmssp_auth.dat", request.data, request.length);
 258 #endif
 259
 260         if (ntlmssp_state->unicode) {
 261                 parse_string = "CdBBUUUBd";
 262         } else {
 263                 parse_string = "CdBBAAABd";
 264         }
 265
 266         /* zero these out */
 267         data_blob_free(&ntlmssp_state->session_key);
 268         data_blob_free(&ntlmssp_state->lm_resp);
 269         data_blob_free(&ntlmssp_state->nt_resp);
 270
 271         ntlmssp_state->user = NULL;
 272         ntlmssp_state->domain = NULL;
 273         ntlmssp_state->workstation = NULL;
 274
 275         /* now the NTLMSSP encoded auth hashes */
 276         if (!msrpc_parse(ntlmssp_state,
 277                          &request, parse_string,
 278                          "NTLMSSP",
 279                          &ntlmssp_command,
 280                          &ntlmssp_state->lm_resp,
 281                          &ntlmssp_state->nt_resp,
 282                          &domain,
 283                          &user,
 284                          &workstation,
 285                          &state->encrypted_session_key,
 286                          &auth_flags)) {
 287                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 288                 dump_data(10, request.data, request.length);
 289
 290                 /* zero this out */
 291                 data_blob_free(&state->encrypted_session_key);
 292                 auth_flags = 0;
 293
 294                 /* Try again with a shorter string (Win9X truncates this packet) */
 295                 if (ntlmssp_state->unicode) {
 296                         parse_string = "CdBBUUU";
 297                 } else {
 298                         parse_string = "CdBBAAA";
 299                 }
 300
 301                 /* now the NTLMSSP encoded auth hashes */
 302                 if (!msrpc_parse(ntlmssp_state,
 303                                  &request, parse_string,
 304                                  "NTLMSSP",
 305                                  &ntlmssp_command,
 306                                  &ntlmssp_state->lm_resp,
 307                                  &ntlmssp_state->nt_resp,
 308                                  &domain,
 309                                  &user,
 310                                  &workstation)) {
 311                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 312                         dump_data(2, request.data, request.length);
 313
 314                         return NT_STATUS_INVALID_PARAMETER;
 315                 }
 316         }
 317
 318         talloc_steal(state, state->encrypted_session_key.data);
 319
 320         if (auth_flags)
 321                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
 322
 323         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 324                 return nt_status;
 325         }
 326
 327         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
 328                 return nt_status;
 329         }
 330
 331         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 332                 return nt_status;
 333         }
 334
 335         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 336                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 337
 338 #if 0
 339         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 340         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 341 #endif
 342
 343         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 344            client challenge
 345
 346            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 347         */
 348         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 349                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 350                         struct MD5Context md5_session_nonce_ctx;
 351                         SMB_ASSERT(ntlmssp_state->internal_chal.data
 352                                    && ntlmssp_state->internal_chal.length == 8);
 353
 354                         state->doing_ntlm2 = true;
 355
 356                         memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8);
 357                         memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 358
 359                         MD5Init(&md5_session_nonce_ctx);
 360                         MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16);
 361                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 362
 363                         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state,
 364                                                                session_nonce_hash, 8);
 365
 366                         /* LM response is no longer useful, zero it out */
 367                         data_blob_free(&ntlmssp_state->lm_resp);
 368
 369                         /* We changed the effective challenge - set it */
 370                         if (!NT_STATUS_IS_OK(nt_status =
 371                                              ntlmssp_state->set_challenge(ntlmssp_state,
 372                                                                                  &ntlmssp_state->chal))) {
 373                                 return nt_status;
 374                         }
 375
 376                         /* LM Key is incompatible... */
 377                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 378                 }
 379         }
 380         return NT_STATUS_OK;
 381 }
 382
 383 /**
 384  * Next state function for the Authenticate packet
 385  * (after authentication - figures out the session keys etc)
 386  *
 387  * @param ntlmssp_state NTLMSSP State
 388  * @return Errors or NT_STATUS_OK.
 389  */
 390
 391 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 392                                         struct ntlmssp_server_auth_state *state)
 393 {
 394         struct gensec_ntlmssp_context *gensec_ntlmssp =
 395                 talloc_get_type_abort(gensec_security->private_data,
 396                                       struct gensec_ntlmssp_context);
 397         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 398         DATA_BLOB *user_session_key = &state->user_session_key;
 399         DATA_BLOB *lm_session_key = &state->lm_session_key;
 400         NTSTATUS nt_status;
 401         DATA_BLOB session_key = data_blob(NULL, 0);
 402
 403         if (!(gensec_security->want_features
 404               & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY))) {
 405                 return NT_STATUS_OK;
 406         }
 407
 408         if (user_session_key)
 409                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 410
 411         if (lm_session_key)
 412                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 413
 414         /* Handle the different session key derivation for NTLM2 */
 415         if (state->doing_ntlm2) {
 416                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 417                         session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 418                         hmac_md5(user_session_key->data, state->session_nonce,
 419                                  sizeof(state->session_nonce), session_key.data);
 420                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 421                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 422
 423                 } else {
 424                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 425                         session_key = data_blob(NULL, 0);
 426                 }
 427         } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 428                 /* Ensure we can never get here on NTLMv2 */
 429                 && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
 430
 431                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 432                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 433                                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 434                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, ntlmssp_state->lm_resp.data,
 435                                                           session_key.data);
 436                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 437                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 438                         } else {
 439
 440                                 /* When there is no LM response, just use zeros */
 441                                 static const uint8_t zeros[24];
 442                                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 443                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 444                                                           session_key.data);
 445                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 446                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 447                         }
 448                 } else {
 449                         /* LM Key not selected */
 450                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 451
 452                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 453                         session_key = data_blob(NULL, 0);
 454                 }
 455
 456         } else if (user_session_key && user_session_key->data) {
 457                 session_key = data_blob_talloc(ntlmssp_state, user_session_key->data, user_session_key->length);
 458                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 459                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 460
 461                 /* LM Key not selected */
 462                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 463
 464         } else if (lm_session_key && lm_session_key->data) {
 465                 /* Very weird to have LM key, but no user session key, but anyway.. */
 466                 session_key = data_blob_talloc(ntlmssp_state, lm_session_key->data, lm_session_key->length);
 467                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 468                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 469
 470                 /* LM Key not selected */
 471                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 472
 473         } else {
 474                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 475                 session_key = data_blob(NULL, 0);
 476
 477                 /* LM Key not selected */
 478                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 479         }
 480
 481         /* With KEY_EXCH, the client supplies the proposed session key,
 482            but encrypts it with the long-term key */
 483         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 484                 if (!state->encrypted_session_key.data
 485                     || state->encrypted_session_key.length != 16) {
 486                         data_blob_free(&state->encrypted_session_key);
 487                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 488                                   (unsigned)state->encrypted_session_key.length));
 489                         return NT_STATUS_INVALID_PARAMETER;
 490                 } else if (!session_key.data || session_key.length != 16) {
 491                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 492                                   (unsigned)session_key.length));
 493                         ntlmssp_state->session_key = session_key;
 494                 } else {
 495                         dump_data_pw("KEY_EXCH session key (enc):\n",
 496                                      state->encrypted_session_key.data,
 497                                      state->encrypted_session_key.length);
 498                         arcfour_crypt(state->encrypted_session_key.data,
 499                                       session_key.data,
 500                                       state->encrypted_session_key.length);
 501                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 502                                                                       state->encrypted_session_key.data,
 503                                                                       state->encrypted_session_key.length);
 504                         dump_data_pw("KEY_EXCH session key:\n",
 505                                      state->encrypted_session_key.data,
 506                                      state->encrypted_session_key.length);
 507                         talloc_free(session_key.data);
 508                 }
 509         } else {
 510                 ntlmssp_state->session_key = session_key;
 511         }
 512
 513         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 514             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 515                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 516         } else {
 517                 nt_status = NT_STATUS_OK;
 518         }
 519
 520         ntlmssp_state->expected_state = NTLMSSP_DONE;
 521
 522         return nt_status;
 523 }
 524
 525
 526 /**
 527  * Next state function for the Authenticate packet
 528  *
 529  * @param gensec_security GENSEC state
 530  * @param out_mem_ctx Memory context for *out
 531  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 532  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 533  * @return Errors or NT_STATUS_OK if authentication sucessful
 534  */
 535
 536 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 537                              TALLOC_CTX *out_mem_ctx,
 538                              const DATA_BLOB in, DATA_BLOB *out)
 539 {
 540         struct gensec_ntlmssp_context *gensec_ntlmssp =
 541                 talloc_get_type_abort(gensec_security->private_data,
 542                                       struct gensec_ntlmssp_context);
 543         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 544         struct ntlmssp_server_auth_state *state;
 545         NTSTATUS nt_status;
 546
 547         /* zero the outbound NTLMSSP packet */
 548         *out = data_blob_null;
 549
 550         state = talloc_zero(ntlmssp_state, struct ntlmssp_server_auth_state);
 551         if (state == NULL) {
 552                 return NT_STATUS_NO_MEMORY;
 553         }
 554
 555         nt_status = ntlmssp_server_preauth(ntlmssp_state, state, in);
 556         if (!NT_STATUS_IS_OK(nt_status)) {
 557                 TALLOC_FREE(state);
 558                 return nt_status;
 559         }
 560
 561         /*
 562          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 563          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 564          * smb.conf file) and no NTLMv2 response was sent then the password check
 565          * will fail here. JRA.
 566          */
 567
 568         /* Finally, actually ask if the password is OK */
 569         nt_status = ntlmssp_state->check_password(ntlmssp_state,
 570                                                   &state->user_session_key,
 571                                                   &state->lm_session_key);
 572         if (!NT_STATUS_IS_OK(nt_status)) {
 573                 TALLOC_FREE(state);
 574                 return nt_status;
 575         }
 576
 577         nt_status = ntlmssp_server_postauth(gensec_security, state);
 578         if (!NT_STATUS_IS_OK(nt_status)) {
 579                 TALLOC_FREE(state);
 580                 return nt_status;
 581         }
 582
 583         TALLOC_FREE(state);
 584         return NT_STATUS_OK;
 585 }
 586
 587 /**
 588  * Return the challenge as determined by the authentication subsystem
 589  * @return an 8 byte random challenge
 590  */
 591
 592 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
 593                                            uint8_t chal[8])
 594 {
 595         struct gensec_ntlmssp_context *gensec_ntlmssp =
 596                 talloc_get_type_abort(ntlmssp_state->callback_private,
 597                                       struct gensec_ntlmssp_context);
 598         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 599         NTSTATUS status;
 600
 601         status = auth_context->get_challenge(auth_context, chal);
 602         if (!NT_STATUS_IS_OK(status)) {
 603                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 604                         nt_errstr(status)));
 605                 return status;
 606         }
 607
 608         return NT_STATUS_OK;
 609 }
 610
 611 /**
 612  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 613  *
 614  * @return If the effective challenge used by the auth subsystem may be modified
 615  */
 616 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 617 {
 618         struct gensec_ntlmssp_context *gensec_ntlmssp =
 619                 talloc_get_type_abort(ntlmssp_state->callback_private,
 620                                       struct gensec_ntlmssp_context);
 621         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 622
 623         return auth_context->challenge_may_be_modified(auth_context);
 624 }
 625
 626 /**
 627  * NTLM2 authentication modifies the effective challenge,
 628  * @param challenge The new challenge value
 629  */
 630 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 631 {
 632         struct gensec_ntlmssp_context *gensec_ntlmssp =
 633                 talloc_get_type_abort(ntlmssp_state->callback_private,
 634                                       struct gensec_ntlmssp_context);
 635         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 636         NTSTATUS nt_status;
 637         const uint8_t *chal;
 638
 639         if (challenge->length != 8) {
 640                 return NT_STATUS_INVALID_PARAMETER;
 641         }
 642
 643         chal = challenge->data;
 644
 645         nt_status = auth_context->set_challenge(auth_context,
 646                                                 chal,
 647                                                 "NTLMSSP callback (NTLM2)");
 648
 649         return nt_status;
 650 }
 651
 652 /**
 653  * Check the password on an NTLMSSP login.
 654  *
 655  * Return the session keys used on the connection.
 656  */
 657
 658 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
 659                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 660 {
 661         struct gensec_ntlmssp_context *gensec_ntlmssp =
 662                 talloc_get_type_abort(ntlmssp_state->callback_private,
 663                                       struct gensec_ntlmssp_context);
 664         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 665         NTSTATUS nt_status;
 666         struct auth_usersupplied_info *user_info;
 667
 668         user_info = talloc(ntlmssp_state, struct auth_usersupplied_info);
 669         if (!user_info) {
 670                 return NT_STATUS_NO_MEMORY;
 671         }
 672
 673         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 674         user_info->flags = 0;
 675         user_info->mapped_state = false;
 676         user_info->client.account_name = ntlmssp_state->user;
 677         user_info->client.domain_name = ntlmssp_state->domain;
 678         user_info->workstation_name = ntlmssp_state->workstation;
 679         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 680
 681         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 682         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 683         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 684         user_info->password.response.nt = ntlmssp_state->nt_resp;
 685         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 686
 687         nt_status = auth_context->check_password(auth_context,
 688                                                  gensec_ntlmssp,
 689                                                  user_info,
 690                                                  &gensec_ntlmssp->server_info);
 691         talloc_free(user_info);
 692         NT_STATUS_NOT_OK_RETURN(nt_status);
 693
 694         if (gensec_ntlmssp->server_info->user_session_key.length) {
 695                 DEBUG(10, ("Got NT session key of length %u\n",
 696                            (unsigned)gensec_ntlmssp->server_info->user_session_key.length));
 697                 *user_session_key = gensec_ntlmssp->server_info->user_session_key;
 698         }
 699         if (gensec_ntlmssp->server_info->lm_session_key.length) {
 700                 DEBUG(10, ("Got LM session key of length %u\n",
 701                            (unsigned)gensec_ntlmssp->server_info->lm_session_key.length));
 702                 *lm_session_key = gensec_ntlmssp->server_info->lm_session_key;
 703         }
 704         return nt_status;
 705 }
 706
 707 /**
 708  * Return the credentials of a logged on user, including session keys
 709  * etc.
 710  *
 711  * Only valid after a successful authentication
 712  *
 713  * May only be called once per authentication.
 714  *
 715  */
 716
 717 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 718                                      struct auth_session_info **session_info)
 719 {
 720         NTSTATUS nt_status;
 721         struct gensec_ntlmssp_context *gensec_ntlmssp =
 722                 talloc_get_type_abort(gensec_security->private_data,
 723                                       struct gensec_ntlmssp_context);
 724         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 725
 726         nt_status = gensec_generate_session_info(ntlmssp_state,
 727                                                  gensec_security,
 728                                                  gensec_ntlmssp->server_info,
 729                                                  session_info);
 730         NT_STATUS_NOT_OK_RETURN(nt_status);
 731
 732         (*session_info)->session_key = data_blob_talloc(*session_info,
 733                                                         ntlmssp_state->session_key.data,
 734                                                         ntlmssp_state->session_key.length);
 735
 736         return NT_STATUS_OK;
 737 }
 738
 739 /**
 740  * Start NTLMSSP on the server side
 741  *
 742  */
 743 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 744 {
 745         NTSTATUS nt_status;
 746         struct ntlmssp_state *ntlmssp_state;
 747         struct gensec_ntlmssp_context *gensec_ntlmssp;
 748
 749         nt_status = gensec_ntlmssp_start(gensec_security);
 750         NT_STATUS_NOT_OK_RETURN(nt_status);
 751
 752         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 753                                                struct gensec_ntlmssp_context);
 754         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 755
 756         ntlmssp_state->role = NTLMSSP_SERVER;
 757
 758         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 759
 760         ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx)
 761                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 762
 763         ntlmssp_state->neg_flags =
 764                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 765
 766         ntlmssp_state->lm_resp = data_blob(NULL, 0);
 767         ntlmssp_state->nt_resp = data_blob(NULL, 0);
 768
 769         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 770                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 771         }
 772
 773         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 774                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 775         }
 776
 777         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 778                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 779         }
 780
 781         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 782                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 783         }
 784
 785         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 786                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 787         }
 788
 789         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 790                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 791         }
 792         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 793                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 794         }
 795
 796         gensec_ntlmssp->auth_context = gensec_security->auth_context;
 797
 798         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 799         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 800         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 801         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 802         if (lp_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 803                 ntlmssp_state->server.is_standalone = true;
 804         } else {
 805                 ntlmssp_state->server.is_standalone = false;
 806         }
 807
 808         ntlmssp_state->server.netbios_name = lp_netbios_name(gensec_security->settings->lp_ctx);
 809
 810         ntlmssp_state->server.netbios_domain = lp_workgroup(gensec_security->settings->lp_ctx);
 811
 812         {
 813                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 814
 815                 /* Find out the DNS domain name */
 816                 dnsdomname[0] = '\0';
 817                 safe_strcpy(dnsdomname, lp_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
 818
 819                 /* Find out the DNS host name */
 820                 safe_strcpy(dnsname, ntlmssp_state->server.netbios_name, sizeof(dnsname) - 1);
 821                 if (dnsdomname[0] != '\0') {
 822                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 823                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 824                 }
 825                 strlower_m(dnsname);
 826
 827                 ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state,
 828                                                                       dnsname);
 829                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 830
 831                 ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state,
 832                                                                         dnsdomname);
 833                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 834         }
 835
 836         return NT_STATUS_OK;
 837 }
 838