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 #include "system/filesys.h"
  31
  32 /**
  33  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  34  *
  35  */
  36
  37 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user)
  38 {
  39         if (!user) {
  40                 /* it should be at least "" */
  41                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  42                 return NT_STATUS_INVALID_PARAMETER;
  43         }
  44         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
  45         if (!gensec_ntlmssp_state->user) {
  46                 return NT_STATUS_NO_MEMORY;
  47         }
  48         return NT_STATUS_OK;
  49 }
  50
  51 /**
  52  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  53  *
  54  */
  55 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain)
  56 {
  57         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
  58         if (!gensec_ntlmssp_state->domain) {
  59                 return NT_STATUS_NO_MEMORY;
  60         }
  61         return NT_STATUS_OK;
  62 }
  63
  64 /**
  65  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  66  *
  67  */
  68 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation)
  69 {
  70         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
  71         if (!gensec_ntlmssp_state->workstation) {
  72                 return NT_STATUS_NO_MEMORY;
  73         }
  74         return NT_STATUS_OK;
  75 }
  76
  77 /**
  78  * Determine correct target name flags for reply, given server role
  79  * and negotiated flags
  80  *
  81  * @param gensec_ntlmssp_state NTLMSSP State
  82  * @param neg_flags The flags from the packet
  83  * @param chal_flags The flags to be set in the reply packet
  84  * @return The 'target name' string.
  85  */
  86
  87 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  88                                        uint32_t neg_flags, uint32_t *chal_flags)
  89 {
  90         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  91                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
  92                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  93                 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) {
  94                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  95                         return gensec_ntlmssp_state->server_name;
  96                 } else {
  97                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
  98                         return gensec_ntlmssp_state->get_domain();
  99                 };
 100         } else {
 101                 return "";
 102         }
 103 }
 104
 105 /*
 106   Andrew, please remove these totally bogus calls when you get time
 107 */
 108 static BOOL get_myfullname(char *my_name)
 109 {
 110         pstring hostname;
 111
 112         *hostname = 0;
 113
 114         /* get my host name */
 115         if (gethostname(hostname, sizeof(hostname)) == -1) {
 116                 DEBUG(0,("gethostname failed\n"));
 117                 return False;
 118         }
 119
 120         /* Ensure null termination. */
 121         hostname[sizeof(hostname)-1] = '\0';
 122
 123         if (my_name)
 124                 fstrcpy(my_name, hostname);
 125         return True;
 126 }
 127
 128 static BOOL get_mydomname(char *my_domname)
 129 {
 130         pstring hostname;
 131         char *p;
 132
 133         /* arrgh! relies on full name in system */
 134
 135         *hostname = 0;
 136         /* get my host name */
 137         if (gethostname(hostname, sizeof(hostname)) == -1) {
 138                 DEBUG(0,("gethostname failed\n"));
 139                 return False;
 140         }
 141
 142         /* Ensure null termination. */
 143         hostname[sizeof(hostname)-1] = '\0';
 144
 145         p = strchr_m(hostname, '.');
 146
 147         if (!p)
 148                 return False;
 149
 150         p++;
 151
 152         if (my_domname)
 153                 fstrcpy(my_domname, p);
 154
 155         return True;
 156 }
 157
 158
 159
 160 /**
 161  * Next state function for the Negotiate packet
 162  *
 163  * @param gensec_security GENSEC state
 164  * @param out_mem_ctx Memory context for *out
 165  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 166  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 167  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 168  */
 169
 170 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 171                                   TALLOC_CTX *out_mem_ctx,
 172                                   const DATA_BLOB in, DATA_BLOB *out)
 173 {
 174         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 175         DATA_BLOB struct_blob;
 176         fstring dnsname, dnsdomname;
 177         uint32_t neg_flags = 0;
 178         uint32_t ntlmssp_command, chal_flags;
 179         char *cliname=NULL, *domname=NULL;
 180         const uint8_t *cryptkey;
 181         const char *target_name;
 182
 183         /* parse the NTLMSSP packet */
 184 #if 0
 185         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 186 #endif
 187
 188         if (in.length) {
 189                 if (!msrpc_parse(out_mem_ctx,
 190                                  &in, "CddAA",
 191                                  "NTLMSSP",
 192                                  &ntlmssp_command,
 193                                  &neg_flags,
 194                                  &cliname,
 195                                  &domname)) {
 196                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP:\n"));
 197                         dump_data(2, in.data, in.length);
 198                         return NT_STATUS_INVALID_PARAMETER;
 199                 }
 200
 201                 debug_ntlmssp_flags(neg_flags);
 202         }
 203
 204         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 205
 206         /* Ask our caller what challenge they would like in the packet */
 207         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
 208
 209         /* Check if we may set the challenge */
 210         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 211                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 212         }
 213
 214         /* The flags we send back are not just the negotiated flags,
 215          * they are also 'what is in this packet'.  Therfore, we
 216          * operate on 'chal_flags' from here on
 217          */
 218
 219         chal_flags = gensec_ntlmssp_state->neg_flags;
 220
 221         /* get the right name to fill in as 'target' */
 222         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 223                                           neg_flags, &chal_flags);
 224         if (target_name == NULL)
 225                 return NT_STATUS_INVALID_PARAMETER;
 226
 227         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 228         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 229
 230         /* This should be a 'netbios domain -> DNS domain' mapping */
 231         dnsdomname[0] = '\0';
 232         get_mydomname(dnsdomname);
 233         strlower_m(dnsdomname);
 234
 235         dnsname[0] = '\0';
 236         get_myfullname(dnsname);
 237
 238         /* This creates the 'blob' of names that appears at the end of the packet */
 239         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 240         {
 241                 const char *target_name_dns = "";
 242                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 243                         target_name_dns = dnsdomname;
 244                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 245                         target_name_dns = dnsname;
 246                 }
 247
 248                 msrpc_gen(out_mem_ctx,
 249                           &struct_blob, "aaaaa",
 250                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 251                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
 252                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 253                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 254                           0, "");
 255         } else {
 256                 struct_blob = data_blob(NULL, 0);
 257         }
 258
 259         {
 260                 /* Marshel the packet in the right format, be it unicode or ASCII */
 261                 const char *gen_string;
 262                 if (gensec_ntlmssp_state->unicode) {
 263                         gen_string = "CdUdbddB";
 264                 } else {
 265                         gen_string = "CdAdbddB";
 266                 }
 267
 268                 msrpc_gen(out_mem_ctx,
 269                           out, gen_string,
 270                           "NTLMSSP",
 271                           NTLMSSP_CHALLENGE,
 272                           target_name,
 273                           chal_flags,
 274                           cryptkey, 8,
 275                           0, 0,
 276                           struct_blob.data, struct_blob.length);
 277         }
 278
 279         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 280
 281         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 282 }
 283
 284 /**
 285  * Next state function for the Authenticate packet
 286  *
 287  * @param gensec_ntlmssp_state NTLMSSP State
 288  * @param request The request, as a DATA_BLOB
 289  * @return Errors or NT_STATUS_OK.
 290  */
 291
 292 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 293                                        const DATA_BLOB request)
 294 {
 295         uint32_t ntlmssp_command, auth_flags;
 296         NTSTATUS nt_status;
 297
 298         uint8_t session_nonce_hash[16];
 299
 300         const char *parse_string;
 301         char *domain = NULL;
 302         char *user = NULL;
 303         char *workstation = NULL;
 304
 305 #if 0
 306         file_save("ntlmssp_auth.dat", request.data, request.length);
 307 #endif
 308
 309         if (gensec_ntlmssp_state->unicode) {
 310                 parse_string = "CdBBUUUBd";
 311         } else {
 312                 parse_string = "CdBBAAABd";
 313         }
 314
 315         /* zero these out */
 316         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 317         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 318         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 319
 320         gensec_ntlmssp_state->user = NULL;
 321         gensec_ntlmssp_state->domain = NULL;
 322         gensec_ntlmssp_state->workstation = NULL;
 323
 324         /* now the NTLMSSP encoded auth hashes */
 325         if (!msrpc_parse(gensec_ntlmssp_state,
 326                          &request, parse_string,
 327                          "NTLMSSP",
 328                          &ntlmssp_command,
 329                          &gensec_ntlmssp_state->lm_resp,
 330                          &gensec_ntlmssp_state->nt_resp,
 331                          &domain,
 332                          &user,
 333                          &workstation,
 334                          &gensec_ntlmssp_state->encrypted_session_key,
 335                          &auth_flags)) {
 336                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 337                 dump_data(10, request.data, request.length);
 338
 339                 /* zero this out */
 340                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 341                 auth_flags = 0;
 342
 343                 /* Try again with a shorter string (Win9X truncates this packet) */
 344                 if (gensec_ntlmssp_state->unicode) {
 345                         parse_string = "CdBBUUU";
 346                 } else {
 347                         parse_string = "CdBBAAA";
 348                 }
 349
 350                 /* now the NTLMSSP encoded auth hashes */
 351                 if (!msrpc_parse(gensec_ntlmssp_state,
 352                                  &request, parse_string,
 353                                  "NTLMSSP",
 354                                  &ntlmssp_command,
 355                                  &gensec_ntlmssp_state->lm_resp,
 356                                  &gensec_ntlmssp_state->nt_resp,
 357                                  &domain,
 358                                  &user,
 359                                  &workstation)) {
 360                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 361                         dump_data(2, request.data, request.length);
 362
 363                         return NT_STATUS_INVALID_PARAMETER;
 364                 }
 365         }
 366
 367         if (auth_flags)
 368                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 369
 370         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 371                 /* zero this out */
 372                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 373                 return nt_status;
 374         }
 375
 376         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 377                 /* zero this out */
 378                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 379                 return nt_status;
 380         }
 381
 382         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 383                 /* zero this out */
 384                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 385                 return nt_status;
 386         }
 387
 388         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 389                  gensec_ntlmssp_state->user, gensec_ntlmssp_state->domain, gensec_ntlmssp_state->workstation, (unsigned long)gensec_ntlmssp_state->lm_resp.length, (unsigned long)gensec_ntlmssp_state->nt_resp.length));
 390
 391 #if 0
 392         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 393         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 394 #endif
 395
 396         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 397            client challenge
 398
 399            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 400         */
 401         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 402                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 403                         struct MD5Context md5_session_nonce_ctx;
 404                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 405                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 406
 407                         gensec_ntlmssp_state->doing_ntlm2 = True;
 408
 409                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 410                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 411
 412                         MD5Init(&md5_session_nonce_ctx);
 413                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 414                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 415
 416                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 417                                                                session_nonce_hash, 8);
 418
 419                         /* LM response is no longer useful, zero it out */
 420                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 421
 422                         /* We changed the effective challenge - set it */
 423                         if (!NT_STATUS_IS_OK(nt_status =
 424                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 425                                                                                  &gensec_ntlmssp_state->chal))) {
 426                                 /* zero this out */
 427                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 428                                 return nt_status;
 429                         }
 430
 431                         /* LM Key is incompatible... */
 432                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 433                 }
 434         }
 435         return NT_STATUS_OK;
 436 }
 437
 438 /**
 439  * Next state function for the Authenticate packet
 440  * (after authentication - figures out the session keys etc)
 441  *
 442  * @param gensec_ntlmssp_state NTLMSSP State
 443  * @return Errors or NT_STATUS_OK.
 444  */
 445
 446 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 447                                         DATA_BLOB *user_session_key,
 448                                         DATA_BLOB *lm_session_key)
 449 {
 450         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 451         NTSTATUS nt_status;
 452         DATA_BLOB session_key = data_blob(NULL, 0);
 453
 454         if (user_session_key)
 455                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 456
 457         if (lm_session_key)
 458                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 459
 460         /* Handle the different session key derivation for NTLM2 */
 461         if (gensec_ntlmssp_state->doing_ntlm2) {
 462                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 463                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 464                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 465                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 466                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 467                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 468
 469                 } else {
 470                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 471                         session_key = data_blob(NULL, 0);
 472                 }
 473         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 474                 /* Ensure we can never get here on NTLMv2 */
 475                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 476
 477                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 478                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 479                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 480                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 481                                                           session_key.data);
 482                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 483                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 484                         } else {
 485
 486                                 /* When there is no LM response, just use zeros */
 487                                 static const uint8_t zeros[24];
 488                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 489                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 490                                                           session_key.data);
 491                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 492                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 493                         }
 494                 } else {
 495                         /* LM Key not selected */
 496                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 497
 498                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 499                         session_key = data_blob(NULL, 0);
 500                 }
 501
 502         } else if (user_session_key && user_session_key->data) {
 503                 session_key = *user_session_key;
 504                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 505                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 506
 507                 /* LM Key not selected */
 508                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 509
 510         } else if (lm_session_key && lm_session_key->data) {
 511                 /* Very weird to have LM key, but no user session key, but anyway.. */
 512                 session_key = *lm_session_key;
 513                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 514                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 515
 516                 /* LM Key not selected */
 517                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 518
 519         } else {
 520                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 521                 session_key = data_blob(NULL, 0);
 522
 523                 /* LM Key not selected */
 524                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 525         }
 526
 527         /* With KEY_EXCH, the client supplies the proposed session key,
 528            but encrypts it with the long-term key */
 529         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 530                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 531                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 532                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 533                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 534                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
 535                         return NT_STATUS_INVALID_PARAMETER;
 536                 } else if (!session_key.data || session_key.length != 16) {
 537                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 538                                   (unsigned)session_key.length));
 539                         gensec_ntlmssp_state->session_key = session_key;
 540                 } else {
 541                         dump_data_pw("KEY_EXCH session key (enc):\n",
 542                                      gensec_ntlmssp_state->encrypted_session_key.data,
 543                                      gensec_ntlmssp_state->encrypted_session_key.length);
 544                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 545                                       session_key.data,
 546                                       gensec_ntlmssp_state->encrypted_session_key.length);
 547                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 548                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 549                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 550                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 551                                      gensec_ntlmssp_state->encrypted_session_key.length);
 552                 }
 553         } else {
 554                 gensec_ntlmssp_state->session_key = session_key;
 555         }
 556
 557         /* The server might need us to use a partial-strength session key */
 558         ntlmssp_weaken_keys(gensec_ntlmssp_state);
 559
 560         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 561             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 562                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 563         } else {
 564                 nt_status = NT_STATUS_OK;
 565         }
 566
 567         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 568
 569         /* allow arbitarily many authentications, but watch that this will cause a
 570            memory leak, until the gensec_ntlmssp_state is shutdown
 571         */
 572
 573         if (gensec_ntlmssp_state->server_multiple_authentications) {
 574                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 575         } else {
 576                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 577         }
 578
 579         return nt_status;
 580 }
 581
 582
 583 /**
 584  * Next state function for the Authenticate packet
 585  *
 586  * @param gensec_security GENSEC state
 587  * @param out_mem_ctx Memory context for *out
 588  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 589  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 590  * @return Errors or NT_STATUS_OK if authentication sucessful
 591  */
 592
 593 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 594                              TALLOC_CTX *out_mem_ctx,
 595                              const DATA_BLOB in, DATA_BLOB *out)
 596 {
 597         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 598         DATA_BLOB user_session_key = data_blob(NULL, 0);
 599         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 600         NTSTATUS nt_status;
 601
 602         /* zero the outbound NTLMSSP packet */
 603         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 604
 605         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 606                 return nt_status;
 607         }
 608
 609         /*
 610          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 611          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 612          * smb.conf file) and no NTLMv2 response was sent then the password check
 613          * will fail here. JRA.
 614          */
 615
 616         /* Finally, actually ask if the password is OK */
 617
 618         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state,
 619                                                                               &user_session_key, &lm_session_key))) {
 620                 return nt_status;
 621         }
 622
 623         if (gensec_security->want_features
 624             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
 625                 return ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 626         } else {
 627                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 628                 return NT_STATUS_OK;
 629         }
 630 }
 631
 632 /**
 633  * Return the challenge as determined by the authentication subsystem
 634  * @return an 8 byte random challenge
 635  */
 636
 637 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 638 {
 639         NTSTATUS status;
 640         const uint8_t *chal;
 641
 642         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 643         if (!NT_STATUS_IS_OK(status)) {
 644                 return NULL;
 645         }
 646
 647         return chal;
 648 }
 649
 650 /**
 651  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 652  *
 653  * @return If the effective challenge used by the auth subsystem may be modified
 654  */
 655 static BOOL auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 656 {
 657         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 658 }
 659
 660 /**
 661  * NTLM2 authentication modifies the effective challenge,
 662  * @param challenge The new challenge value
 663  */
 664 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 665 {
 666         NTSTATUS nt_status;
 667         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 668         const uint8_t *chal;
 669
 670         if (challenge->length != 8) {
 671                 return NT_STATUS_INVALID_PARAMETER;
 672         }
 673
 674         chal = challenge->data;
 675
 676         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 677
 678         return nt_status;
 679 }
 680
 681 /**
 682  * Check the password on an NTLMSSP login.
 683  *
 684  * Return the session keys used on the connection.
 685  */
 686
 687 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 688 {
 689         NTSTATUS nt_status;
 690         struct auth_usersupplied_info *user_info = talloc(gensec_ntlmssp_state, struct auth_usersupplied_info);
 691         if (!user_info) {
 692                 return NT_STATUS_NO_MEMORY;
 693         }
 694
 695         user_info->flags = 0;
 696         user_info->mapped_state = False;
 697         user_info->client.account_name = gensec_ntlmssp_state->user;
 698         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 699         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 700
 701         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 702         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 703         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 704         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 705         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 706
 707         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, gensec_ntlmssp_state,
 708                                         user_info, &gensec_ntlmssp_state->server_info);
 709         talloc_free(user_info);
 710         NT_STATUS_NOT_OK_RETURN(nt_status);
 711
 712         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 713                 DEBUG(10, ("Got NT session key of length %u\n",
 714                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 715                 *user_session_key = data_blob_talloc(gensec_ntlmssp_state,
 716                                                    gensec_ntlmssp_state->server_info->user_session_key.data,
 717                                                    gensec_ntlmssp_state->server_info->user_session_key.length);
 718         }
 719         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 720                 DEBUG(10, ("Got LM session key of length %u\n",
 721                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 722                 *lm_session_key = data_blob_talloc(gensec_ntlmssp_state,
 723                                                    gensec_ntlmssp_state->server_info->lm_session_key.data,
 724                                                    gensec_ntlmssp_state->server_info->lm_session_key.length);
 725         }
 726         return nt_status;
 727 }
 728
 729 /**
 730  * Return the credentials of a logged on user, including session keys
 731  * etc.
 732  *
 733  * Only valid after a successful authentication
 734  *
 735  * May only be called once per authentication.
 736  *
 737  */
 738
 739 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 740                                      struct auth_session_info **session_info)
 741 {
 742         NTSTATUS nt_status;
 743         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 744
 745         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info, session_info);
 746         NT_STATUS_NOT_OK_RETURN(nt_status);
 747
 748         (*session_info)->session_key = data_blob_talloc(*session_info,
 749                                                         gensec_ntlmssp_state->session_key.data,
 750                                                         gensec_ntlmssp_state->session_key.length);
 751
 752         return NT_STATUS_OK;
 753 }
 754
 755 /**
 756  * Start NTLMSSP on the server side
 757  *
 758  */
 759 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 760 {
 761         NTSTATUS nt_status;
 762         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 763
 764         nt_status = gensec_ntlmssp_start(gensec_security);
 765         NT_STATUS_NOT_OK_RETURN(nt_status);
 766
 767         gensec_ntlmssp_state = gensec_security->private_data;
 768
 769         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 770
 771         gensec_ntlmssp_state->workstation = NULL;
 772         gensec_ntlmssp_state->server_name = lp_netbios_name();
 773
 774         gensec_ntlmssp_state->get_domain = lp_workgroup;
 775
 776         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 777
 778         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth()
 779                                           && lp_parm_bool(-1, "ntlmssp_server", "allow_lm_key", False));
 780
 781         gensec_ntlmssp_state->server_multiple_authentications = False;
 782
 783         gensec_ntlmssp_state->neg_flags =
 784                 NTLMSSP_NEGOTIATE_NTLM;
 785
 786         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 787         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 788         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 789
 790         if (lp_parm_bool(-1, "ntlmssp_server", "128bit", True)) {
 791                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 792         }
 793
 794         if (lp_parm_bool(-1, "ntlmssp_server", "keyexchange", True)) {
 795                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 796         }
 797
 798         if (lp_parm_bool(-1, "ntlmssp_server", "ntlm2", True)) {
 799                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 800         }
 801
 802         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 803                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 804         }
 805         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 806                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 807         }
 808
 809         nt_status = auth_context_create(gensec_ntlmssp_state, lp_auth_methods(),
 810                                         &gensec_ntlmssp_state->auth_context,
 811                                         gensec_security->event_ctx);
 812         NT_STATUS_NOT_OK_RETURN(nt_status);
 813
 814         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 815         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 816         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 817         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 818         gensec_ntlmssp_state->server_role = lp_server_role();
 819
 820         return NT_STATUS_OK;
 821 }
 822