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 "auth/ntlmssp/ntlmssp.h"
  26 #include "auth/ntlmssp/msrpc_parse.h"
  27 #include "lib/crypto/crypto.h"
  28 #include "system/filesys.h"
  29 #include "libcli/auth/libcli_auth.h"
  30 #include "auth/credentials/credentials.h"
  31 #include "auth/gensec/gensec.h"
  32 #include "auth/auth.h"
  33
  34 /**
  35  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  36  *
  37  */
  38
  39 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user)
  40 {
  41         if (!user) {
  42                 /* it should be at least "" */
  43                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  44                 return NT_STATUS_INVALID_PARAMETER;
  45         }
  46         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
  47         if (!gensec_ntlmssp_state->user) {
  48                 return NT_STATUS_NO_MEMORY;
  49         }
  50         return NT_STATUS_OK;
  51 }
  52
  53 /**
  54  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  55  *
  56  */
  57 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain)
  58 {
  59         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
  60         if (!gensec_ntlmssp_state->domain) {
  61                 return NT_STATUS_NO_MEMORY;
  62         }
  63         return NT_STATUS_OK;
  64 }
  65
  66 /**
  67  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  68  *
  69  */
  70 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation)
  71 {
  72         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
  73         if (!gensec_ntlmssp_state->workstation) {
  74                 return NT_STATUS_NO_MEMORY;
  75         }
  76         return NT_STATUS_OK;
  77 }
  78
  79 /**
  80  * Determine correct target name flags for reply, given server role
  81  * and negotiated flags
  82  *
  83  * @param gensec_ntlmssp_state NTLMSSP State
  84  * @param neg_flags The flags from the packet
  85  * @param chal_flags The flags to be set in the reply packet
  86  * @return The 'target name' string.
  87  */
  88
  89 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  90                                        uint32_t neg_flags, uint32_t *chal_flags)
  91 {
  92         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  93                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
  94                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  95                 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) {
  96                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  97                         return gensec_ntlmssp_state->server_name;
  98                 } else {
  99                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 100                         return gensec_ntlmssp_state->get_domain();
 101                 };
 102         } else {
 103                 return "";
 104         }
 105 }
 106
 107
 108
 109 /**
 110  * Next state function for the Negotiate packet
 111  *
 112  * @param gensec_security GENSEC state
 113  * @param out_mem_ctx Memory context for *out
 114  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 115  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 116  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 117  */
 118
 119 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 120                                   TALLOC_CTX *out_mem_ctx,
 121                                   const DATA_BLOB in, DATA_BLOB *out)
 122 {
 123         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 124         DATA_BLOB struct_blob;
 125         char dnsname[MAXHOSTNAMELEN], dnsdomname[MAXHOSTNAMELEN];
 126         const char *p;
 127         uint32_t neg_flags = 0;
 128         uint32_t ntlmssp_command, chal_flags;
 129         const uint8_t *cryptkey;
 130         const char *target_name;
 131
 132         /* parse the NTLMSSP packet */
 133 #if 0
 134         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 135 #endif
 136
 137         if (in.length) {
 138                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx, &in, "Cdd",
 139                                                          "NTLMSSP",
 140                                                          &ntlmssp_command,
 141                                                          &neg_flags)) {
 142                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 143                                 "NTLMSSP Negotiate of length %u:\n",
 144                                 (unsigned int)in.length ));
 145                         dump_data(2, in.data, in.length);
 146                         return NT_STATUS_INVALID_PARAMETER;
 147                 }
 148                 debug_ntlmssp_flags(neg_flags);
 149         }
 150
 151         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 152
 153         /* Ask our caller what challenge they would like in the packet */
 154         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
 155
 156         /* Check if we may set the challenge */
 157         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 158                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 159         }
 160
 161         /* The flags we send back are not just the negotiated flags,
 162          * they are also 'what is in this packet'.  Therfore, we
 163          * operate on 'chal_flags' from here on
 164          */
 165
 166         chal_flags = gensec_ntlmssp_state->neg_flags;
 167
 168         /* get the right name to fill in as 'target' */
 169         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 170                                           neg_flags, &chal_flags);
 171         if (target_name == NULL)
 172                 return NT_STATUS_INVALID_PARAMETER;
 173
 174         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 175         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 176
 177         dnsname[0] = '\0';
 178         if (gethostname(dnsname, sizeof(dnsname)) == -1) {
 179                 DEBUG(0,("gethostname failed\n"));
 180                 return NT_STATUS_UNSUCCESSFUL;
 181         }
 182
 183         /* This should be a 'netbios domain -> DNS domain' mapping */
 184         p = strchr(dnsname, '.');
 185         if (p != NULL) {
 186                 safe_strcpy(dnsdomname, p+1, sizeof(dnsdomname));
 187                 strlower_m(dnsdomname);
 188         } else {
 189                 dnsdomname[0] = '\0';
 190         }
 191
 192         /* This creates the 'blob' of names that appears at the end of the packet */
 193         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 194         {
 195                 const char *target_name_dns = "";
 196                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 197                         target_name_dns = dnsdomname;
 198                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 199                         target_name_dns = dnsname;
 200                 }
 201
 202                 msrpc_gen(out_mem_ctx,
 203                           &struct_blob, "aaaaa",
 204                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 205                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
 206                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 207                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 208                           0, "");
 209         } else {
 210                 struct_blob = data_blob(NULL, 0);
 211         }
 212
 213         {
 214                 /* Marshel the packet in the right format, be it unicode or ASCII */
 215                 const char *gen_string;
 216                 if (gensec_ntlmssp_state->unicode) {
 217                         gen_string = "CdUdbddB";
 218                 } else {
 219                         gen_string = "CdAdbddB";
 220                 }
 221
 222                 msrpc_gen(out_mem_ctx,
 223                           out, gen_string,
 224                           "NTLMSSP",
 225                           NTLMSSP_CHALLENGE,
 226                           target_name,
 227                           chal_flags,
 228                           cryptkey, 8,
 229                           0, 0,
 230                           struct_blob.data, struct_blob.length);
 231         }
 232
 233         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 234
 235         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 236 }
 237
 238 /**
 239  * Next state function for the Authenticate packet
 240  *
 241  * @param gensec_ntlmssp_state NTLMSSP State
 242  * @param request The request, as a DATA_BLOB
 243  * @return Errors or NT_STATUS_OK.
 244  */
 245
 246 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 247                                        const DATA_BLOB request)
 248 {
 249         uint32_t ntlmssp_command, auth_flags;
 250         NTSTATUS nt_status;
 251
 252         uint8_t session_nonce_hash[16];
 253
 254         const char *parse_string;
 255         char *domain = NULL;
 256         char *user = NULL;
 257         char *workstation = NULL;
 258
 259 #if 0
 260         file_save("ntlmssp_auth.dat", request.data, request.length);
 261 #endif
 262
 263         if (gensec_ntlmssp_state->unicode) {
 264                 parse_string = "CdBBUUUBd";
 265         } else {
 266                 parse_string = "CdBBAAABd";
 267         }
 268
 269         /* zero these out */
 270         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 271         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 272         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 273
 274         gensec_ntlmssp_state->user = NULL;
 275         gensec_ntlmssp_state->domain = NULL;
 276         gensec_ntlmssp_state->workstation = NULL;
 277
 278         /* now the NTLMSSP encoded auth hashes */
 279         if (!msrpc_parse(gensec_ntlmssp_state,
 280                          &request, parse_string,
 281                          "NTLMSSP",
 282                          &ntlmssp_command,
 283                          &gensec_ntlmssp_state->lm_resp,
 284                          &gensec_ntlmssp_state->nt_resp,
 285                          &domain,
 286                          &user,
 287                          &workstation,
 288                          &gensec_ntlmssp_state->encrypted_session_key,
 289                          &auth_flags)) {
 290                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 291                 dump_data(10, request.data, request.length);
 292
 293                 /* zero this out */
 294                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 295                 auth_flags = 0;
 296
 297                 /* Try again with a shorter string (Win9X truncates this packet) */
 298                 if (gensec_ntlmssp_state->unicode) {
 299                         parse_string = "CdBBUUU";
 300                 } else {
 301                         parse_string = "CdBBAAA";
 302                 }
 303
 304                 /* now the NTLMSSP encoded auth hashes */
 305                 if (!msrpc_parse(gensec_ntlmssp_state,
 306                                  &request, parse_string,
 307                                  "NTLMSSP",
 308                                  &ntlmssp_command,
 309                                  &gensec_ntlmssp_state->lm_resp,
 310                                  &gensec_ntlmssp_state->nt_resp,
 311                                  &domain,
 312                                  &user,
 313                                  &workstation)) {
 314                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 315                         dump_data(2, request.data, request.length);
 316
 317                         return NT_STATUS_INVALID_PARAMETER;
 318                 }
 319         }
 320
 321         if (auth_flags)
 322                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 323
 324         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 325                 /* zero this out */
 326                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 327                 return nt_status;
 328         }
 329
 330         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 331                 /* zero this out */
 332                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 333                 return nt_status;
 334         }
 335
 336         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 337                 /* zero this out */
 338                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 339                 return nt_status;
 340         }
 341
 342         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 343                  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));
 344
 345 #if 0
 346         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 347         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 348 #endif
 349
 350         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 351            client challenge
 352
 353            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 354         */
 355         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 356                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 357                         struct MD5Context md5_session_nonce_ctx;
 358                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 359                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 360
 361                         gensec_ntlmssp_state->doing_ntlm2 = True;
 362
 363                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 364                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 365
 366                         MD5Init(&md5_session_nonce_ctx);
 367                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 368                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 369
 370                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 371                                                                session_nonce_hash, 8);
 372
 373                         /* LM response is no longer useful, zero it out */
 374                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 375
 376                         /* We changed the effective challenge - set it */
 377                         if (!NT_STATUS_IS_OK(nt_status =
 378                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 379                                                                                  &gensec_ntlmssp_state->chal))) {
 380                                 /* zero this out */
 381                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 382                                 return nt_status;
 383                         }
 384
 385                         /* LM Key is incompatible... */
 386                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 387                 }
 388         }
 389         return NT_STATUS_OK;
 390 }
 391
 392 /**
 393  * Next state function for the Authenticate packet
 394  * (after authentication - figures out the session keys etc)
 395  *
 396  * @param gensec_ntlmssp_state NTLMSSP State
 397  * @return Errors or NT_STATUS_OK.
 398  */
 399
 400 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 401                                         DATA_BLOB *user_session_key,
 402                                         DATA_BLOB *lm_session_key)
 403 {
 404         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 405         NTSTATUS nt_status;
 406         DATA_BLOB session_key = data_blob(NULL, 0);
 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 (gensec_ntlmssp_state->doing_ntlm2) {
 416                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 417                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 418                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 419                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.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 ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 428                 /* Ensure we can never get here on NTLMv2 */
 429                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 430
 431                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 432                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 433                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 434                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_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(gensec_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                         gensec_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 = *user_session_key;
 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                 gensec_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 = *lm_session_key;
 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                 gensec_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                 gensec_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 (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 484                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 485                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 486                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 487                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 488                                   (unsigned)gensec_ntlmssp_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                         gensec_ntlmssp_state->session_key = session_key;
 494                 } else {
 495                         dump_data_pw("KEY_EXCH session key (enc):\n",
 496                                      gensec_ntlmssp_state->encrypted_session_key.data,
 497                                      gensec_ntlmssp_state->encrypted_session_key.length);
 498                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 499                                       session_key.data,
 500                                       gensec_ntlmssp_state->encrypted_session_key.length);
 501                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 502                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 503                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 504                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 505                                      gensec_ntlmssp_state->encrypted_session_key.length);
 506                 }
 507         } else {
 508                 gensec_ntlmssp_state->session_key = session_key;
 509         }
 510
 511         /* keep the session key around on the new context */
 512         talloc_steal(gensec_ntlmssp_state, session_key.data);
 513
 514         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 515             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 516                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 517         } else {
 518                 nt_status = NT_STATUS_OK;
 519         }
 520
 521         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 522
 523         /* allow arbitarily many authentications, but watch that this will cause a
 524            memory leak, until the gensec_ntlmssp_state is shutdown
 525         */
 526
 527         if (gensec_ntlmssp_state->server_multiple_authentications) {
 528                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 529         } else {
 530                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 531         }
 532
 533         return nt_status;
 534 }
 535
 536
 537 /**
 538  * Next state function for the Authenticate packet
 539  *
 540  * @param gensec_security GENSEC state
 541  * @param out_mem_ctx Memory context for *out
 542  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 543  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 544  * @return Errors or NT_STATUS_OK if authentication sucessful
 545  */
 546
 547 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 548                              TALLOC_CTX *out_mem_ctx,
 549                              const DATA_BLOB in, DATA_BLOB *out)
 550 {
 551         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 552         DATA_BLOB user_session_key = data_blob(NULL, 0);
 553         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 554         NTSTATUS nt_status;
 555
 556         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
 557         if (!mem_ctx) {
 558                 return NT_STATUS_NO_MEMORY;
 559         }
 560
 561         /* zero the outbound NTLMSSP packet */
 562         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 563
 564         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 565                 talloc_free(mem_ctx);
 566                 return nt_status;
 567         }
 568
 569         /*
 570          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 571          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 572          * smb.conf file) and no NTLMv2 response was sent then the password check
 573          * will fail here. JRA.
 574          */
 575
 576         /* Finally, actually ask if the password is OK */
 577
 578         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
 579                                                                               &user_session_key, &lm_session_key))) {
 580                 talloc_free(mem_ctx);
 581                 return nt_status;
 582         }
 583
 584         if (gensec_security->want_features
 585             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
 586                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 587                 talloc_free(mem_ctx);
 588                 return nt_status;
 589         } else {
 590                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 591                 talloc_free(mem_ctx);
 592                 return NT_STATUS_OK;
 593         }
 594 }
 595
 596 /**
 597  * Return the challenge as determined by the authentication subsystem
 598  * @return an 8 byte random challenge
 599  */
 600
 601 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 602 {
 603         NTSTATUS status;
 604         const uint8_t *chal;
 605
 606         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 607         if (!NT_STATUS_IS_OK(status)) {
 608                 return NULL;
 609         }
 610
 611         return chal;
 612 }
 613
 614 /**
 615  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 616  *
 617  * @return If the effective challenge used by the auth subsystem may be modified
 618  */
 619 static BOOL auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 620 {
 621         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 622 }
 623
 624 /**
 625  * NTLM2 authentication modifies the effective challenge,
 626  * @param challenge The new challenge value
 627  */
 628 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 629 {
 630         NTSTATUS nt_status;
 631         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 632         const uint8_t *chal;
 633
 634         if (challenge->length != 8) {
 635                 return NT_STATUS_INVALID_PARAMETER;
 636         }
 637
 638         chal = challenge->data;
 639
 640         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 641
 642         return nt_status;
 643 }
 644
 645 /**
 646  * Check the password on an NTLMSSP login.
 647  *
 648  * Return the session keys used on the connection.
 649  */
 650
 651 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 652                                             TALLOC_CTX *mem_ctx,
 653                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 654 {
 655         NTSTATUS nt_status;
 656         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
 657         if (!user_info) {
 658                 return NT_STATUS_NO_MEMORY;
 659         }
 660
 661         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 662         user_info->flags = 0;
 663         user_info->mapped_state = False;
 664         user_info->client.account_name = gensec_ntlmssp_state->user;
 665         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 666         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 667         user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
 668
 669         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 670         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 671         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 672         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 673         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 674
 675         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx,
 676                                         user_info, &gensec_ntlmssp_state->server_info);
 677         talloc_free(user_info);
 678         NT_STATUS_NOT_OK_RETURN(nt_status);
 679
 680         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
 681
 682         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 683                 DEBUG(10, ("Got NT session key of length %u\n",
 684                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 685                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
 686                         return NT_STATUS_NO_MEMORY;
 687                 }
 688
 689                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
 690         }
 691         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 692                 DEBUG(10, ("Got LM session key of length %u\n",
 693                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 694                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
 695                         return NT_STATUS_NO_MEMORY;
 696                 }
 697
 698                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
 699         }
 700         return nt_status;
 701 }
 702
 703 /**
 704  * Return the credentials of a logged on user, including session keys
 705  * etc.
 706  *
 707  * Only valid after a successful authentication
 708  *
 709  * May only be called once per authentication.
 710  *
 711  */
 712
 713 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 714                                      struct auth_session_info **session_info)
 715 {
 716         NTSTATUS nt_status;
 717         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 718
 719         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info, session_info);
 720         NT_STATUS_NOT_OK_RETURN(nt_status);
 721
 722         (*session_info)->session_key = data_blob_talloc(*session_info,
 723                                                         gensec_ntlmssp_state->session_key.data,
 724                                                         gensec_ntlmssp_state->session_key.length);
 725
 726         return NT_STATUS_OK;
 727 }
 728
 729 /**
 730  * Start NTLMSSP on the server side
 731  *
 732  */
 733 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 734 {
 735         NTSTATUS nt_status;
 736         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 737
 738         nt_status = gensec_ntlmssp_start(gensec_security);
 739         NT_STATUS_NOT_OK_RETURN(nt_status);
 740
 741         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 742
 743         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 744
 745         gensec_ntlmssp_state->workstation = NULL;
 746         gensec_ntlmssp_state->server_name = lp_netbios_name();
 747
 748         gensec_ntlmssp_state->get_domain = lp_workgroup;
 749
 750         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 751
 752         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth()
 753                                           && lp_parm_bool(-1, "ntlmssp_server", "allow_lm_key", False));
 754
 755         gensec_ntlmssp_state->server_multiple_authentications = False;
 756
 757         gensec_ntlmssp_state->neg_flags =
 758                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
 759
 760         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 761         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 762         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 763
 764         if (lp_parm_bool(-1, "ntlmssp_server", "128bit", True)) {
 765                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 766         }
 767
 768         if (lp_parm_bool(-1, "ntlmssp_server", "56bit", True)) {
 769                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 770         }
 771
 772         if (lp_parm_bool(-1, "ntlmssp_server", "keyexchange", True)) {
 773                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 774         }
 775
 776         if (lp_parm_bool(-1, "ntlmssp_server", "alwayssign", True)) {
 777                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 778         }
 779
 780         if (lp_parm_bool(-1, "ntlmssp_server", "ntlm2", True)) {
 781                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 782         }
 783
 784         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 785                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 786         }
 787         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 788                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 789         }
 790
 791         nt_status = auth_context_create(gensec_ntlmssp_state,
 792                                         gensec_security->event_ctx,
 793                                         gensec_security->msg_ctx,
 794                                         &gensec_ntlmssp_state->auth_context);
 795         NT_STATUS_NOT_OK_RETURN(nt_status);
 796
 797         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 798         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 799         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 800         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 801         gensec_ntlmssp_state->server_role = lp_server_role();
 802
 803         return NT_STATUS_OK;
 804 }
 805