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 2 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, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "auth/auth.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "lib/crypto/crypto.h"
  29 #include "pstring.h"
  30
  31 /**
  32  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  33  *
  34  */
  35
  36 static NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
  37 {
  38         if (!user) {
  39                 /* it should be at least "" */
  40                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  41                 return NT_STATUS_INVALID_PARAMETER;
  42         }
  43         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user);
  44         if (!ntlmssp_state->user) {
  45                 return NT_STATUS_NO_MEMORY;
  46         }
  47         return NT_STATUS_OK;
  48 }
  49
  50 /**
  51  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  52  *
  53  */
  54 static NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
  55 {
  56         ntlmssp_state->domain = talloc_strdup(ntlmssp_state, domain);
  57         if (!ntlmssp_state->domain) {
  58                 return NT_STATUS_NO_MEMORY;
  59         }
  60         return NT_STATUS_OK;
  61 }
  62
  63 /**
  64  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  65  *
  66  */
  67 static NTSTATUS ntlmssp_set_workstation(struct ntlmssp_state *ntlmssp_state, const char *workstation)
  68 {
  69         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state, workstation);
  70         if (!ntlmssp_state->workstation) {
  71                 return NT_STATUS_NO_MEMORY;
  72         }
  73         return NT_STATUS_OK;
  74 }
  75
  76 /**
  77  * Default challenge generation code.
  78  *
  79  */
  80
  81 static const uint8_t *get_challenge(const struct ntlmssp_state *ntlmssp_state)
  82 {
  83         uint8_t *chal = talloc_size(ntlmssp_state, 8);
  84         generate_random_buffer(chal, 8);
  85
  86         return chal;
  87 }
  88
  89 /**
  90  * Default 'we can set the challenge to anything we like' implementation
  91  *
  92  */
  93
  94 static BOOL may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  95 {
  96         return True;
  97 }
  98
  99 /**
 100  * Default 'we can set the challenge to anything we like' implementation
 101  *
 102  * Does not actually do anything, as the value is always in the structure anyway.
 103  *
 104  */
 105
 106 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 107 {
 108         SMB_ASSERT(challenge->length == 8);
 109         return NT_STATUS_OK;
 110 }
 111
 112 /**
 113  * Determine correct target name flags for reply, given server role
 114  * and negotiated flags
 115  *
 116  * @param ntlmssp_state NTLMSSP State
 117  * @param neg_flags The flags from the packet
 118  * @param chal_flags The flags to be set in the reply packet
 119  * @return The 'target name' string.
 120  */
 121
 122 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
 123                                        uint32_t neg_flags, uint32_t *chal_flags)
 124 {
 125         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
 126                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
 127                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
 128                 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
 129                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 130                         return ntlmssp_state->server_name;
 131                 } else {
 132                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 133                         return ntlmssp_state->get_domain();
 134                 };
 135         } else {
 136                 return "";
 137         }
 138 }
 139
 140 /**
 141  * Next state function for the Negotiate packet
 142  *
 143  * @param ntlmssp_state NTLMSSP State
 144  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 145  * @param in The request, as a DATA_BLOB
 146  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 147  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 148  */
 149
 150 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 151                                   TALLOC_CTX *out_mem_ctx,
 152                                   const DATA_BLOB in, DATA_BLOB *out)
 153 {
 154         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 155         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp_state->ntlmssp_state;
 156         DATA_BLOB struct_blob;
 157         fstring dnsname, dnsdomname;
 158         uint32_t neg_flags = 0;
 159         uint32_t ntlmssp_command, chal_flags;
 160         char *cliname=NULL, *domname=NULL;
 161         const uint8_t *cryptkey;
 162         const char *target_name;
 163
 164         /* parse the NTLMSSP packet */
 165 #if 0
 166         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 167 #endif
 168
 169         if (in.length) {
 170                 if (!msrpc_parse(ntlmssp_state,
 171                                  &in, "CddAA",
 172                                  "NTLMSSP",
 173                                  &ntlmssp_command,
 174                                  &neg_flags,
 175                                  &cliname,
 176                                  &domname)) {
 177                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP:\n"));
 178                         dump_data(2, in.data, in.length);
 179                         return NT_STATUS_INVALID_PARAMETER;
 180                 }
 181
 182                 debug_ntlmssp_flags(neg_flags);
 183         }
 184
 185         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
 186
 187         /* Ask our caller what challenge they would like in the packet */
 188         cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
 189
 190         /* Check if we may set the challenge */
 191         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 192                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 193         }
 194
 195         /* The flags we send back are not just the negotiated flags,
 196          * they are also 'what is in this packet'.  Therfore, we
 197          * operate on 'chal_flags' from here on
 198          */
 199
 200         chal_flags = ntlmssp_state->neg_flags;
 201
 202         /* get the right name to fill in as 'target' */
 203         target_name = ntlmssp_target_name(ntlmssp_state,
 204                                           neg_flags, &chal_flags);
 205         if (target_name == NULL)
 206                 return NT_STATUS_INVALID_PARAMETER;
 207
 208         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 209         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 210
 211         /* This should be a 'netbios domain -> DNS domain' mapping */
 212         dnsdomname[0] = '\0';
 213         get_mydomname(dnsdomname);
 214         strlower_m(dnsdomname);
 215
 216         dnsname[0] = '\0';
 217         get_myfullname(dnsname);
 218
 219         /* This creates the 'blob' of names that appears at the end of the packet */
 220         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 221         {
 222                 const char *target_name_dns = "";
 223                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 224                         target_name_dns = dnsdomname;
 225                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 226                         target_name_dns = dnsname;
 227                 }
 228
 229                 msrpc_gen(out_mem_ctx,
 230                           &struct_blob, "aaaaa",
 231                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 232                           NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->server_name,
 233                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 234                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 235                           0, "");
 236         } else {
 237                 struct_blob = data_blob(NULL, 0);
 238         }
 239
 240         {
 241                 /* Marshel the packet in the right format, be it unicode or ASCII */
 242                 const char *gen_string;
 243                 if (ntlmssp_state->unicode) {
 244                         gen_string = "CdUdbddB";
 245                 } else {
 246                         gen_string = "CdAdbddB";
 247                 }
 248
 249                 msrpc_gen(out_mem_ctx,
 250                           out, gen_string,
 251                           "NTLMSSP",
 252                           NTLMSSP_CHALLENGE,
 253                           target_name,
 254                           chal_flags,
 255                           cryptkey, 8,
 256                           0, 0,
 257                           struct_blob.data, struct_blob.length);
 258         }
 259
 260         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 261
 262         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 263 }
 264
 265 /**
 266  * Next state function for the Authenticate packet
 267  *
 268  * @param ntlmssp_state NTLMSSP State
 269  * @param request The request, as a DATA_BLOB
 270  * @return Errors or NT_STATUS_OK.
 271  */
 272
 273 static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
 274                                        const DATA_BLOB request)
 275 {
 276         uint32_t ntlmssp_command, auth_flags;
 277         NTSTATUS nt_status;
 278
 279         uint8_t session_nonce_hash[16];
 280
 281         const char *parse_string;
 282         char *domain = NULL;
 283         char *user = NULL;
 284         char *workstation = NULL;
 285
 286 #if 0
 287         file_save("ntlmssp_auth.dat", request.data, request.length);
 288 #endif
 289
 290         if (ntlmssp_state->unicode) {
 291                 parse_string = "CdBBUUUBd";
 292         } else {
 293                 parse_string = "CdBBAAABd";
 294         }
 295
 296         /* zero these out */
 297         data_blob_free(&ntlmssp_state->lm_resp);
 298         data_blob_free(&ntlmssp_state->nt_resp);
 299
 300         ntlmssp_state->user = NULL;
 301         ntlmssp_state->domain = NULL;
 302         ntlmssp_state->workstation = NULL;
 303
 304         /* now the NTLMSSP encoded auth hashes */
 305         if (!msrpc_parse(ntlmssp_state,
 306                          &request, parse_string,
 307                          "NTLMSSP",
 308                          &ntlmssp_command,
 309                          &ntlmssp_state->lm_resp,
 310                          &ntlmssp_state->nt_resp,
 311                          &domain,
 312                          &user,
 313                          &workstation,
 314                          &ntlmssp_state->encrypted_session_key,
 315                          &auth_flags)) {
 316                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 317                 dump_data(10, request.data, request.length);
 318
 319                 /* zero this out */
 320                 data_blob_free(&ntlmssp_state->encrypted_session_key);
 321                 auth_flags = 0;
 322
 323                 /* Try again with a shorter string (Win9X truncates this packet) */
 324                 if (ntlmssp_state->unicode) {
 325                         parse_string = "CdBBUUU";
 326                 } else {
 327                         parse_string = "CdBBAAA";
 328                 }
 329
 330                 /* now the NTLMSSP encoded auth hashes */
 331                 if (!msrpc_parse(ntlmssp_state,
 332                                  &request, parse_string,
 333                                  "NTLMSSP",
 334                                  &ntlmssp_command,
 335                                  &ntlmssp_state->lm_resp,
 336                                  &ntlmssp_state->nt_resp,
 337                                  &domain,
 338                                  &user,
 339                                  &workstation)) {
 340                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 341                         dump_data(2, request.data, request.length);
 342
 343                         return NT_STATUS_INVALID_PARAMETER;
 344                 }
 345         }
 346
 347         if (auth_flags)
 348                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
 349
 350         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 351                 /* zero this out */
 352                 data_blob_free(&ntlmssp_state->encrypted_session_key);
 353                 return nt_status;
 354         }
 355
 356         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
 357                 /* zero this out */
 358                 data_blob_free(&ntlmssp_state->encrypted_session_key);
 359                 return nt_status;
 360         }
 361
 362         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 363                 /* zero this out */
 364                 data_blob_free(&ntlmssp_state->encrypted_session_key);
 365                 return nt_status;
 366         }
 367
 368         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 369                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 370
 371 #if 0
 372         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 373         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 374 #endif
 375
 376         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 377            client challenge
 378
 379            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 380         */
 381         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 382                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 383                         struct MD5Context md5_session_nonce_ctx;
 384                         SMB_ASSERT(ntlmssp_state->internal_chal.data
 385                                    && ntlmssp_state->internal_chal.length == 8);
 386
 387                         ntlmssp_state->doing_ntlm2 = True;
 388
 389                         memcpy(ntlmssp_state->session_nonce, ntlmssp_state->internal_chal.data, 8);
 390                         memcpy(&ntlmssp_state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 391
 392                         MD5Init(&md5_session_nonce_ctx);
 393                         MD5Update(&md5_session_nonce_ctx, ntlmssp_state->session_nonce, 16);
 394                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 395
 396                         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state,
 397                                                                session_nonce_hash, 8);
 398
 399                         /* LM response is no longer useful, zero it out */
 400                         data_blob_free(&ntlmssp_state->lm_resp);
 401
 402                         /* We changed the effective challenge - set it */
 403                         if (!NT_STATUS_IS_OK(nt_status =
 404                                              ntlmssp_state->set_challenge(ntlmssp_state,
 405                                                                           &ntlmssp_state->chal))) {
 406                                 /* zero this out */
 407                                 data_blob_free(&ntlmssp_state->encrypted_session_key);
 408                                 return nt_status;
 409                         }
 410
 411                         /* LM Key is incompatible... */
 412                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 413                 }
 414         }
 415         return NT_STATUS_OK;
 416 }
 417
 418 /**
 419  * Next state function for the Authenticate packet
 420  * (after authentication - figures out the session keys etc)
 421  *
 422  * @param ntlmssp_state NTLMSSP State
 423  * @return Errors or NT_STATUS_OK.
 424  */
 425
 426 static NTSTATUS ntlmssp_server_postauth(struct ntlmssp_state *ntlmssp_state,
 427                                         DATA_BLOB *user_session_key,
 428                                         DATA_BLOB *lm_session_key)
 429 {
 430         NTSTATUS nt_status;
 431         DATA_BLOB session_key = data_blob(NULL, 0);
 432
 433         if (user_session_key)
 434                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 435
 436         if (lm_session_key)
 437                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 438
 439         /* Handle the different session key derivation for NTLM2 */
 440         if (ntlmssp_state->doing_ntlm2) {
 441                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 442                         session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 443                         hmac_md5(user_session_key->data, ntlmssp_state->session_nonce,
 444                                  sizeof(ntlmssp_state->session_nonce), session_key.data);
 445                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 446                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 447
 448                 } else {
 449                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 450                         session_key = data_blob(NULL, 0);
 451                 }
 452         } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 453                 /* Ensure we can never get here on NTLMv2 */
 454                 && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
 455
 456                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 457                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 458                                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 459                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, ntlmssp_state->lm_resp.data,
 460                                                           session_key.data);
 461                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 462                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 463                         } else {
 464
 465                                 /* When there is no LM response, just use zeros */
 466                                 static const uint8_t zeros[24];
 467                                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 468                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 469                                                           session_key.data);
 470                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 471                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 472                         }
 473                 } else {
 474                         /* LM Key not selected */
 475                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 476
 477                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 478                         session_key = data_blob(NULL, 0);
 479                 }
 480
 481         } else if (user_session_key && user_session_key->data) {
 482                 session_key = *user_session_key;
 483                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 484                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 485
 486                 /* LM Key not selected */
 487                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 488
 489         } else if (lm_session_key && lm_session_key->data) {
 490                 /* Very weird to have LM key, but no user session key, but anyway.. */
 491                 session_key = *lm_session_key;
 492                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 493                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 494
 495                 /* LM Key not selected */
 496                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 497
 498         } else {
 499                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 500                 session_key = data_blob(NULL, 0);
 501
 502                 /* LM Key not selected */
 503                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 504         }
 505
 506         /* With KEY_EXCH, the client supplies the proposed session key,
 507            but encrypts it with the long-term key */
 508         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 509                 if (!ntlmssp_state->encrypted_session_key.data
 510                     || ntlmssp_state->encrypted_session_key.length != 16) {
 511                         data_blob_free(&ntlmssp_state->encrypted_session_key);
 512                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 513                                   ntlmssp_state->encrypted_session_key.length));
 514                         return NT_STATUS_INVALID_PARAMETER;
 515                 } else if (!session_key.data || session_key.length != 16) {
 516                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 517                                   session_key.length));
 518                         ntlmssp_state->session_key = session_key;
 519                 } else {
 520                         dump_data_pw("KEY_EXCH session key (enc):\n",
 521                                      ntlmssp_state->encrypted_session_key.data,
 522                                      ntlmssp_state->encrypted_session_key.length);
 523                         arcfour_crypt(ntlmssp_state->encrypted_session_key.data,
 524                                       session_key.data,
 525                                       ntlmssp_state->encrypted_session_key.length);
 526                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 527                                                                       ntlmssp_state->encrypted_session_key.data,
 528                                                                       ntlmssp_state->encrypted_session_key.length);
 529                         dump_data_pw("KEY_EXCH session key:\n", ntlmssp_state->encrypted_session_key.data,
 530                                      ntlmssp_state->encrypted_session_key.length);
 531                 }
 532         } else {
 533                 ntlmssp_state->session_key = session_key;
 534         }
 535
 536         /* The server might need us to use a partial-strength session key */
 537         ntlmssp_weaken_keys(ntlmssp_state);
 538
 539         nt_status = ntlmssp_sign_init(ntlmssp_state);
 540
 541         data_blob_free(&ntlmssp_state->encrypted_session_key);
 542
 543         /* allow arbitarily many authentications, but watch that this will cause a
 544            memory leak, until the ntlmssp_state is shutdown
 545         */
 546
 547         if (ntlmssp_state->server_multiple_authentications) {
 548                 ntlmssp_state->expected_state = NTLMSSP_AUTH;
 549         } else {
 550                 ntlmssp_state->expected_state = NTLMSSP_DONE;
 551         }
 552
 553         return nt_status;
 554 }
 555
 556
 557 /**
 558  * Next state function for the Authenticate packet
 559  *
 560  * @param ntlmssp_state NTLMSSP State
 561  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 562  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 563  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 564  */
 565
 566 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 567                              TALLOC_CTX *out_mem_ctx,
 568                              const DATA_BLOB in, DATA_BLOB *out)
 569 {
 570         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 571         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp_state->ntlmssp_state;
 572         DATA_BLOB user_session_key = data_blob(NULL, 0);
 573         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 574         NTSTATUS nt_status;
 575
 576         /* zero the outbound NTLMSSP packet */
 577         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 578
 579         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(ntlmssp_state, in))) {
 580                 return nt_status;
 581         }
 582
 583         /*
 584          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 585          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 586          * smb.conf file) and no NTLMv2 response was sent then the password check
 587          * will fail here. JRA.
 588          */
 589
 590         /* Finally, actually ask if the password is OK */
 591
 592         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 593                                                                        &user_session_key, &lm_session_key))) {
 594                 return nt_status;
 595         }
 596
 597         if (ntlmssp_state->server_use_session_keys) {
 598                 return ntlmssp_server_postauth(ntlmssp_state, &user_session_key, &lm_session_key);
 599         } else {
 600                 ntlmssp_state->session_key = data_blob(NULL, 0);
 601                 return NT_STATUS_OK;
 602         }
 603 }
 604
 605 /**
 606  * Create an NTLMSSP state machine
 607  *
 608  * @param ntlmssp_state NTLMSSP State, allocated by this function
 609  */
 610
 611 static NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx, struct ntlmssp_state **ntlmssp_state)
 612 {
 613         *ntlmssp_state = talloc(mem_ctx, struct ntlmssp_state);
 614         if (!*ntlmssp_state) {
 615                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 616                 return NT_STATUS_NO_MEMORY;
 617         }
 618         ZERO_STRUCTP(*ntlmssp_state);
 619
 620         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 621
 622         (*ntlmssp_state)->get_challenge = get_challenge;
 623         (*ntlmssp_state)->set_challenge = set_challenge;
 624         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 625
 626         (*ntlmssp_state)->workstation = NULL;
 627         (*ntlmssp_state)->server_name = lp_netbios_name();
 628
 629         (*ntlmssp_state)->get_domain = lp_workgroup;
 630         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 631
 632         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 633
 634         (*ntlmssp_state)->allow_lm_key = (lp_lanman_auth()
 635                                           && lp_parm_bool(-1, "ntlmssp_server", "allow_lm_key", False));
 636
 637         (*ntlmssp_state)->server_use_session_keys = True;
 638         (*ntlmssp_state)->server_multiple_authentications = False;
 639
 640         (*ntlmssp_state)->neg_flags =
 641                 NTLMSSP_NEGOTIATE_NTLM;
 642
 643         if (lp_parm_bool(-1, "ntlmssp_server", "128bit", True)) {
 644                 (*ntlmssp_state)->neg_flags |= NTLMSSP_NEGOTIATE_128;
 645         }
 646
 647         if (lp_parm_bool(-1, "ntlmssp_server", "keyexchange", True)) {
 648                 (*ntlmssp_state)->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 649         }
 650
 651         if (lp_parm_bool(-1, "ntlmssp_server", "ntlm2", True)) {
 652                 (*ntlmssp_state)->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 653         }
 654
 655         return NT_STATUS_OK;
 656 }
 657
 658 /**
 659  * Return the challenge as determined by the authentication subsystem
 660  * @return an 8 byte random challenge
 661  */
 662
 663 static const uint8_t *auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state)
 664 {
 665         struct gensec_ntlmssp_state *gensec_ntlmssp_state = ntlmssp_state->auth_context;
 666         NTSTATUS status;
 667         const uint8_t *chal;
 668
 669         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 670         if (!NT_STATUS_IS_OK(status)) {
 671                 return NULL;
 672         }
 673
 674         return chal;
 675 }
 676
 677 /**
 678  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 679  *
 680  * @return If the effective challenge used by the auth subsystem may be modified
 681  */
 682 static BOOL auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 683 {
 684         struct gensec_ntlmssp_state *gensec_ntlmssp_state = ntlmssp_state->auth_context;
 685
 686         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 687 }
 688
 689 /**
 690  * NTLM2 authentication modifies the effective challenge,
 691  * @param challenge The new challenge value
 692  */
 693 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 694 {
 695         NTSTATUS nt_status;
 696         struct gensec_ntlmssp_state *gensec_ntlmssp_state = ntlmssp_state->auth_context;
 697         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 698         const uint8_t *chal;
 699
 700         if (challenge->length != 8) {
 701                 return NT_STATUS_INVALID_PARAMETER;
 702         }
 703
 704         chal = challenge->data;
 705
 706         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 707
 708         return nt_status;
 709 }
 710
 711 /**
 712  * Check the password on an NTLMSSP login.
 713  *
 714  * Return the session keys used on the connection.
 715  */
 716
 717 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 718 {
 719         struct gensec_ntlmssp_state *gensec_ntlmssp_state = ntlmssp_state->auth_context;
 720         struct auth_usersupplied_info *user_info = NULL;
 721         NTSTATUS nt_status;
 722
 723         nt_status = make_user_info_map(ntlmssp_state,
 724                                        gensec_ntlmssp_state->ntlmssp_state->user,
 725                                        gensec_ntlmssp_state->ntlmssp_state->domain,
 726                                        gensec_ntlmssp_state->ntlmssp_state->workstation,
 727                                        gensec_ntlmssp_state->ntlmssp_state->lm_resp.data ? &gensec_ntlmssp_state->ntlmssp_state->lm_resp : NULL,
 728                                        gensec_ntlmssp_state->ntlmssp_state->nt_resp.data ? &gensec_ntlmssp_state->ntlmssp_state->nt_resp : NULL,
 729                                        NULL, NULL, NULL, True,
 730                                        &user_info);
 731         NT_STATUS_NOT_OK_RETURN(nt_status);
 732
 733         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, gensec_ntlmssp_state,
 734                                         user_info, &gensec_ntlmssp_state->server_info);
 735         talloc_free(user_info);
 736         NT_STATUS_NOT_OK_RETURN(nt_status);
 737
 738         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 739                 DEBUG(10, ("Got NT session key of length %u\n", gensec_ntlmssp_state->server_info->user_session_key.length));
 740                 *user_session_key = data_blob_talloc(ntlmssp_state,
 741                                                    gensec_ntlmssp_state->server_info->user_session_key.data,
 742                                                    gensec_ntlmssp_state->server_info->user_session_key.length);
 743         }
 744         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 745                 DEBUG(10, ("Got LM session key of length %u\n", gensec_ntlmssp_state->server_info->lm_session_key.length));
 746                 *lm_session_key = data_blob_talloc(ntlmssp_state,
 747                                                    gensec_ntlmssp_state->server_info->lm_session_key.data,
 748                                                    gensec_ntlmssp_state->server_info->lm_session_key.length);
 749         }
 750         return nt_status;
 751 }
 752
 753 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 754 {
 755         NTSTATUS nt_status;
 756         struct ntlmssp_state *ntlmssp_state;
 757         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 758
 759         nt_status = gensec_ntlmssp_start(gensec_security);
 760         NT_STATUS_NOT_OK_RETURN(nt_status);
 761
 762         gensec_ntlmssp_state = gensec_security->private_data;
 763
 764         nt_status = ntlmssp_server_start(gensec_ntlmssp_state, &gensec_ntlmssp_state->ntlmssp_state);
 765         NT_STATUS_NOT_OK_RETURN(nt_status);
 766
 767         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 768                 gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 769         }
 770         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 771                 gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 772         }
 773
 774         nt_status = auth_context_create(gensec_ntlmssp_state, lp_auth_methods(), &gensec_ntlmssp_state->auth_context);
 775         NT_STATUS_NOT_OK_RETURN(nt_status);
 776
 777         ntlmssp_state = gensec_ntlmssp_state->ntlmssp_state;
 778         ntlmssp_state->auth_context = gensec_ntlmssp_state;
 779         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 780         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 781         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 782         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 783         ntlmssp_state->server_role = lp_server_role();
 784
 785         return NT_STATUS_OK;
 786 }
 787
 788 /**
 789  * Return the credentials of a logged on user, including session keys
 790  * etc.
 791  *
 792  * Only valid after a successful authentication
 793  *
 794  * May only be called once per authentication.
 795  *
 796  */
 797
 798 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 799                                      struct auth_session_info **session_info)
 800 {
 801         NTSTATUS nt_status;
 802         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 803
 804         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info, session_info);
 805         NT_STATUS_NOT_OK_RETURN(nt_status);
 806
 807         (*session_info)->session_key = data_blob_talloc(*session_info,
 808                                                         gensec_ntlmssp_state->ntlmssp_state->session_key.data,
 809                                                         gensec_ntlmssp_state->ntlmssp_state->session_key.length);
 810
 811         return NT_STATUS_OK;
 812 }