source4/auth/ntlmssp/ntlmssp_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, client server side parsing
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/network.h"
  26 #include "lib/tsocket/tsocket.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  29 #include "../libcli/auth/ntlmssp_ndr.h"
  30 #include "../libcli/auth/libcli_auth.h"
  31 #include "../lib/crypto/crypto.h"
  32 #include "auth/gensec/gensec.h"
  33 #include "auth/gensec/gensec_proto.h"
  34 #include "auth/auth.h"
  35 #include "param/param.h"
  36
  37 /**
  38  * Determine correct target name flags for reply, given server role
  39  * and negotiated flags
  40  *
  41  * @param ntlmssp_state NTLMSSP State
  42  * @param neg_flags The flags from the packet
  43  * @param chal_flags The flags to be set in the reply packet
  44  * @return The 'target name' string.
  45  */
  46
  47 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
  48                                        uint32_t neg_flags, uint32_t *chal_flags)
  49 {
  50         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  51                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
  52                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  53                 if (ntlmssp_state->server.is_standalone) {
  54                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  55                         return ntlmssp_state->server.netbios_name;
  56                 } else {
  57                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
  58                         return ntlmssp_state->server.netbios_domain;
  59                 };
  60         } else {
  61                 return "";
  62         }
  63 }
  64
  65
  66
  67 /**
  68  * Next state function for the Negotiate packet
  69  *
  70  * @param gensec_security GENSEC state
  71  * @param out_mem_ctx Memory context for *out
  72  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  73  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  74  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
  75  */
  76
  77 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
  78                                   TALLOC_CTX *out_mem_ctx,
  79                                          const DATA_BLOB request, DATA_BLOB *reply)
  80 {
  81         struct gensec_ntlmssp_context *gensec_ntlmssp =
  82                 talloc_get_type_abort(gensec_security->private_data,
  83                                       struct gensec_ntlmssp_context);
  84         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  85         DATA_BLOB struct_blob;
  86         uint32_t neg_flags = 0;
  87         uint32_t ntlmssp_command, chal_flags;
  88         uint8_t cryptkey[8];
  89         const char *target_name;
  90         NTSTATUS status;
  91
  92         /* parse the NTLMSSP packet */
  93 #if 0
  94         file_save("ntlmssp_negotiate.dat", request.data, request.length);
  95 #endif
  96
  97         if (request.length) {
  98                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
  99                                                           "NTLMSSP",
 100                                                           &ntlmssp_command,
 101                                                           &neg_flags)) {
 102                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 103                                 (unsigned int)request.length));
 104                         dump_data(2, request.data, request.length);
 105                         return NT_STATUS_INVALID_PARAMETER;
 106                 }
 107                 debug_ntlmssp_flags(neg_flags);
 108
 109                 if (DEBUGLEVEL >= 10) {
 110                         struct NEGOTIATE_MESSAGE *negotiate = talloc(
 111                                 ntlmssp_state, struct NEGOTIATE_MESSAGE);
 112                         if (negotiate != NULL) {
 113                                 status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 114                                         &request, negotiate, negotiate);
 115                                 if (NT_STATUS_IS_OK(status)) {
 116                                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 117                                                         negotiate);
 118                                 }
 119                                 TALLOC_FREE(negotiate);
 120                         }
 121                 }
 122         }
 123
 124         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
 125
 126         /* Ask our caller what challenge they would like in the packet */
 127         status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 128         if (!NT_STATUS_IS_OK(status)) {
 129                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge: %s\n",
 130                           nt_errstr(status)));
 131                 return status;
 132         }
 133
 134         /* Check if we may set the challenge */
 135         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 136                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 137         }
 138
 139         /* The flags we send back are not just the negotiated flags,
 140          * they are also 'what is in this packet'.  Therfore, we
 141          * operate on 'chal_flags' from here on
 142          */
 143
 144         chal_flags = ntlmssp_state->neg_flags;
 145
 146         /* get the right name to fill in as 'target' */
 147         target_name = ntlmssp_target_name(ntlmssp_state,
 148                                           neg_flags, &chal_flags);
 149         if (target_name == NULL)
 150                 return NT_STATUS_INVALID_PARAMETER;
 151
 152         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 153         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 154                                                         cryptkey, 8);
 155
 156         /* This creates the 'blob' of names that appears at the end of the packet */
 157         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 158         {
 159                 msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 160                           MsvAvNbDomainName, target_name,
 161                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 162                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 163                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 164                           MsvAvEOL, "");
 165         } else {
 166                 struct_blob = data_blob_null;
 167         }
 168
 169         {
 170                 /* Marshal the packet in the right format, be it unicode or ASCII */
 171                 const char *gen_string;
 172                 DATA_BLOB version_blob = data_blob_null;
 173
 174                 if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) {
 175                         enum ndr_err_code err;
 176                         struct VERSION vers;
 177
 178                         /* "What Windows returns" as a version number. */
 179                         ZERO_STRUCT(vers);
 180                         vers.ProductMajorVersion = NTLMSSP_WINDOWS_MAJOR_VERSION_6;
 181                         vers.ProductMinorVersion = NTLMSSP_WINDOWS_MINOR_VERSION_1;
 182                         vers.ProductBuild = 0;
 183                         vers.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
 184
 185                         err = ndr_push_struct_blob(&version_blob,
 186                                                 ntlmssp_state,
 187                                                 &vers,
 188                                                 (ndr_push_flags_fn_t)ndr_push_VERSION);
 189
 190                         if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
 191                                 data_blob_free(&struct_blob);
 192                                 return NT_STATUS_NO_MEMORY;
 193                         }
 194                 }
 195
 196                 if (ntlmssp_state->unicode) {
 197                         gen_string = "CdUdbddBb";
 198                 } else {
 199                         gen_string = "CdAdbddBb";
 200                 }
 201
 202                 msrpc_gen(out_mem_ctx, reply, gen_string,
 203                         "NTLMSSP",
 204                         NTLMSSP_CHALLENGE,
 205                         target_name,
 206                         chal_flags,
 207                         cryptkey, 8,
 208                         0, 0,
 209                         struct_blob.data, struct_blob.length,
 210                         version_blob.data, version_blob.length);
 211
 212                 data_blob_free(&version_blob);
 213
 214                 if (DEBUGLEVEL >= 10) {
 215                         struct CHALLENGE_MESSAGE *challenge = talloc(
 216                                 ntlmssp_state, struct CHALLENGE_MESSAGE);
 217                         if (challenge != NULL) {
 218                                 challenge->NegotiateFlags = chal_flags;
 219                                 status = ntlmssp_pull_CHALLENGE_MESSAGE(
 220                                         reply, challenge, challenge);
 221                                 if (NT_STATUS_IS_OK(status)) {
 222                                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 223                                                         challenge);
 224                                 }
 225                                 TALLOC_FREE(challenge);
 226                         }
 227                 }
 228         }
 229
 230         data_blob_free(&struct_blob);
 231
 232         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 233
 234         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 235 }
 236
 237 struct ntlmssp_server_auth_state {
 238         DATA_BLOB user_session_key;
 239         DATA_BLOB lm_session_key;
 240         /* internal variables used by KEY_EXCH (client-supplied user session key */
 241         DATA_BLOB encrypted_session_key;
 242         bool doing_ntlm2;
 243         /* internal variables used by NTLM2 */
 244         uint8_t session_nonce[16];
 245 };
 246
 247 /**
 248  * Next state function for the Authenticate packet
 249  *
 250  * @param ntlmssp_state NTLMSSP State
 251  * @param request The request, as a DATA_BLOB
 252  * @return Errors or NT_STATUS_OK.
 253  */
 254
 255 static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
 256                                        struct ntlmssp_server_auth_state *state,
 257                                        const DATA_BLOB request)
 258 {
 259         uint32_t ntlmssp_command, auth_flags;
 260         NTSTATUS nt_status;
 261
 262         uint8_t session_nonce_hash[16];
 263
 264         const char *parse_string;
 265
 266 #if 0
 267         file_save("ntlmssp_auth.dat", request.data, request.length);
 268 #endif
 269
 270         if (ntlmssp_state->unicode) {
 271                 parse_string = "CdBBUUUBd";
 272         } else {
 273                 parse_string = "CdBBAAABd";
 274         }
 275
 276         /* zero these out */
 277         data_blob_free(&ntlmssp_state->session_key);
 278         data_blob_free(&ntlmssp_state->lm_resp);
 279         data_blob_free(&ntlmssp_state->nt_resp);
 280
 281         ntlmssp_state->user = NULL;
 282         ntlmssp_state->domain = NULL;
 283         ntlmssp_state->client.netbios_name = NULL;
 284
 285         /* now the NTLMSSP encoded auth hashes */
 286         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 287                          "NTLMSSP",
 288                          &ntlmssp_command,
 289                          &ntlmssp_state->lm_resp,
 290                          &ntlmssp_state->nt_resp,
 291                          &ntlmssp_state->domain,
 292                          &ntlmssp_state->user,
 293                          &ntlmssp_state->client.netbios_name,
 294                          &state->encrypted_session_key,
 295                          &auth_flags)) {
 296                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 297                 dump_data(10, request.data, request.length);
 298
 299                 /* zero this out */
 300                 data_blob_free(&state->encrypted_session_key);
 301                 auth_flags = 0;
 302
 303                 /* Try again with a shorter string (Win9X truncates this packet) */
 304                 if (ntlmssp_state->unicode) {
 305                         parse_string = "CdBBUUU";
 306                 } else {
 307                         parse_string = "CdBBAAA";
 308                 }
 309
 310                 /* now the NTLMSSP encoded auth hashes */
 311                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 312                                  "NTLMSSP",
 313                                  &ntlmssp_command,
 314                                  &ntlmssp_state->lm_resp,
 315                                  &ntlmssp_state->nt_resp,
 316                                  &ntlmssp_state->domain,
 317                                  &ntlmssp_state->user,
 318                                  &ntlmssp_state->client.netbios_name)) {
 319                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 320                         dump_data(2, request.data, request.length);
 321
 322                         return NT_STATUS_INVALID_PARAMETER;
 323                 }
 324         }
 325
 326         talloc_steal(state, state->encrypted_session_key.data);
 327
 328         if (auth_flags)
 329                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
 330
 331         if (DEBUGLEVEL >= 10) {
 332                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 333                         ntlmssp_state, struct AUTHENTICATE_MESSAGE);
 334                 if (authenticate != NULL) {
 335                         NTSTATUS status;
 336                         authenticate->NegotiateFlags = auth_flags;
 337                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 338                                 &request, authenticate, authenticate);
 339                         if (NT_STATUS_IS_OK(status)) {
 340                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 341                                                 authenticate);
 342                         }
 343                         TALLOC_FREE(authenticate);
 344                 }
 345         }
 346
 347         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 348                  ntlmssp_state->user, ntlmssp_state->domain,
 349                  ntlmssp_state->client.netbios_name,
 350                  (unsigned long)ntlmssp_state->lm_resp.length,
 351                  (unsigned long)ntlmssp_state->nt_resp.length));
 352
 353 #if 0
 354         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 355         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 356 #endif
 357
 358         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 359            client challenge
 360
 361            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 362         */
 363         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 364                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 365                         struct MD5Context md5_session_nonce_ctx;
 366                         state->doing_ntlm2 = true;
 367
 368                         memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8);
 369                         memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 370
 371                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 372
 373                         MD5Init(&md5_session_nonce_ctx);
 374                         MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16);
 375                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 376
 377                         ntlmssp_state->chal = data_blob_talloc(
 378                                 ntlmssp_state, session_nonce_hash, 8);
 379
 380                         /* LM response is no longer useful */
 381                         data_blob_free(&ntlmssp_state->lm_resp);
 382
 383                         /* We changed the effective challenge - set it */
 384                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 385                                 return nt_status;
 386                         }
 387
 388                         /* LM Key is incompatible. */
 389                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 390                 }
 391         }
 392         return NT_STATUS_OK;
 393 }
 394
 395 /**
 396  * Next state function for the Authenticate packet
 397  * (after authentication - figures out the session keys etc)
 398  *
 399  * @param ntlmssp_state NTLMSSP State
 400  * @return Errors or NT_STATUS_OK.
 401  */
 402
 403 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 404                                         struct ntlmssp_server_auth_state *state)
 405 {
 406         struct gensec_ntlmssp_context *gensec_ntlmssp =
 407                 talloc_get_type_abort(gensec_security->private_data,
 408                                       struct gensec_ntlmssp_context);
 409         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 410         DATA_BLOB *user_session_key = &state->user_session_key;
 411         DATA_BLOB *lm_session_key = &state->lm_session_key;
 412         NTSTATUS nt_status;
 413         DATA_BLOB session_key = data_blob(NULL, 0);
 414
 415         if (user_session_key)
 416                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 417
 418         if (lm_session_key)
 419                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 420
 421         /* Handle the different session key derivation for NTLM2 */
 422         if (state->doing_ntlm2) {
 423                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 424                         session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 425                         hmac_md5(user_session_key->data, state->session_nonce,
 426                                  sizeof(state->session_nonce), session_key.data);
 427                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 428                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 429
 430                 } else {
 431                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 432                         session_key = data_blob_null;
 433                 }
 434         } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 435                 /* Ensure we can never get here on NTLMv2 */
 436                 && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
 437
 438                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 439                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 440                                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 441                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, ntlmssp_state->lm_resp.data,
 442                                                           session_key.data);
 443                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 444                         } else {
 445                                 static const uint8_t zeros[24] = {0, };
 446                                 session_key = data_blob_talloc(
 447                                         ntlmssp_state, NULL, 16);
 448                                 if (session_key.data == NULL) {
 449                                         return NT_STATUS_NO_MEMORY;
 450                                 }
 451                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 452                                                           session_key.data);
 453                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 454                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 455                         }
 456                         dump_data_pw("LM session key:\n", session_key.data,
 457                                      session_key.length);
 458                 } else {
 459                         /* LM Key not selected */
 460                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 461
 462                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 463                         session_key = data_blob_null;
 464                 }
 465
 466         } else if (user_session_key && user_session_key->data) {
 467                 session_key = data_blob_talloc(ntlmssp_state, user_session_key->data, user_session_key->length);
 468                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 469                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 470
 471                 /* LM Key not selected */
 472                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 473
 474         } else if (lm_session_key && lm_session_key->data) {
 475                 /* Very weird to have LM key, but no user session key, but anyway.. */
 476                 session_key = data_blob_talloc(ntlmssp_state, lm_session_key->data, lm_session_key->length);
 477                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 478                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 479
 480                 /* LM Key not selected */
 481                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 482
 483         } else {
 484                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 485                 session_key = data_blob(NULL, 0);
 486
 487                 /* LM Key not selected */
 488                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 489         }
 490
 491         /* With KEY_EXCH, the client supplies the proposed session key,
 492            but encrypts it with the long-term key */
 493         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 494                 if (!state->encrypted_session_key.data
 495                     || state->encrypted_session_key.length != 16) {
 496                         data_blob_free(&state->encrypted_session_key);
 497                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 498                                   (unsigned)state->encrypted_session_key.length));
 499                         return NT_STATUS_INVALID_PARAMETER;
 500                 } else if (!session_key.data || session_key.length != 16) {
 501                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 502                                   (unsigned int)session_key.length));
 503                         ntlmssp_state->session_key = session_key;
 504                 } else {
 505                         dump_data_pw("KEY_EXCH session key (enc):\n",
 506                                      state->encrypted_session_key.data,
 507                                      state->encrypted_session_key.length);
 508                         arcfour_crypt(state->encrypted_session_key.data,
 509                                       session_key.data,
 510                                       state->encrypted_session_key.length);
 511                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 512                                                                       state->encrypted_session_key.data,
 513                                                                       state->encrypted_session_key.length);
 514                         dump_data_pw("KEY_EXCH session key:\n",
 515                                      state->encrypted_session_key.data,
 516                                      state->encrypted_session_key.length);
 517                         talloc_free(session_key.data);
 518                 }
 519         } else {
 520                 ntlmssp_state->session_key = session_key;
 521         }
 522
 523         if (ntlmssp_state->session_key.length) {
 524                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 525         }
 526
 527         ntlmssp_state->expected_state = NTLMSSP_DONE;
 528
 529         return nt_status;
 530 }
 531
 532
 533 /**
 534  * Next state function for the Authenticate packet
 535  *
 536  * @param gensec_security GENSEC state
 537  * @param out_mem_ctx Memory context for *out
 538  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 539  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 540  * @return Errors or NT_STATUS_OK if authentication sucessful
 541  */
 542
 543 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 544                              TALLOC_CTX *out_mem_ctx,
 545                              const DATA_BLOB in, DATA_BLOB *out)
 546 {
 547         struct gensec_ntlmssp_context *gensec_ntlmssp =
 548                 talloc_get_type_abort(gensec_security->private_data,
 549                                       struct gensec_ntlmssp_context);
 550         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 551         struct ntlmssp_server_auth_state *state;
 552         NTSTATUS nt_status;
 553
 554         /* zero the outbound NTLMSSP packet */
 555         *out = data_blob_null;
 556
 557         state = talloc_zero(ntlmssp_state, struct ntlmssp_server_auth_state);
 558         if (state == NULL) {
 559                 return NT_STATUS_NO_MEMORY;
 560         }
 561
 562         nt_status = ntlmssp_server_preauth(ntlmssp_state, state, in);
 563         if (!NT_STATUS_IS_OK(nt_status)) {
 564                 TALLOC_FREE(state);
 565                 return nt_status;
 566         }
 567
 568         /*
 569          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 570          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 571          * smb.conf file) and no NTLMv2 response was sent then the password check
 572          * will fail here. JRA.
 573          */
 574
 575         /* Finally, actually ask if the password is OK */
 576         nt_status = ntlmssp_state->check_password(ntlmssp_state,
 577                                                   &state->user_session_key,
 578                                                   &state->lm_session_key);
 579         if (!NT_STATUS_IS_OK(nt_status)) {
 580                 TALLOC_FREE(state);
 581                 return nt_status;
 582         }
 583
 584         nt_status = ntlmssp_server_postauth(gensec_security, state);
 585         if (!NT_STATUS_IS_OK(nt_status)) {
 586                 TALLOC_FREE(state);
 587                 return nt_status;
 588         }
 589
 590         TALLOC_FREE(state);
 591         return NT_STATUS_OK;
 592 }
 593
 594 /**
 595  * Return the challenge as determined by the authentication subsystem
 596  * @return an 8 byte random challenge
 597  */
 598
 599 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
 600                                            uint8_t chal[8])
 601 {
 602         struct gensec_ntlmssp_context *gensec_ntlmssp =
 603                 talloc_get_type_abort(ntlmssp_state->callback_private,
 604                                       struct gensec_ntlmssp_context);
 605         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 606         NTSTATUS status;
 607
 608         status = auth_context->get_challenge(auth_context, chal);
 609         if (!NT_STATUS_IS_OK(status)) {
 610                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 611                         nt_errstr(status)));
 612                 return status;
 613         }
 614
 615         return NT_STATUS_OK;
 616 }
 617
 618 /**
 619  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 620  *
 621  * @return If the effective challenge used by the auth subsystem may be modified
 622  */
 623 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 624 {
 625         struct gensec_ntlmssp_context *gensec_ntlmssp =
 626                 talloc_get_type_abort(ntlmssp_state->callback_private,
 627                                       struct gensec_ntlmssp_context);
 628         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 629
 630         return auth_context->challenge_may_be_modified(auth_context);
 631 }
 632
 633 /**
 634  * NTLM2 authentication modifies the effective challenge,
 635  * @param challenge The new challenge value
 636  */
 637 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 638 {
 639         struct gensec_ntlmssp_context *gensec_ntlmssp =
 640                 talloc_get_type_abort(ntlmssp_state->callback_private,
 641                                       struct gensec_ntlmssp_context);
 642         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 643         NTSTATUS nt_status;
 644         const uint8_t *chal;
 645
 646         if (challenge->length != 8) {
 647                 return NT_STATUS_INVALID_PARAMETER;
 648         }
 649
 650         chal = challenge->data;
 651
 652         nt_status = auth_context->set_challenge(auth_context,
 653                                                 chal,
 654                                                 "NTLMSSP callback (NTLM2)");
 655
 656         return nt_status;
 657 }
 658
 659 /**
 660  * Check the password on an NTLMSSP login.
 661  *
 662  * Return the session keys used on the connection.
 663  */
 664
 665 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
 666                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 667 {
 668         struct gensec_ntlmssp_context *gensec_ntlmssp =
 669                 talloc_get_type_abort(ntlmssp_state->callback_private,
 670                                       struct gensec_ntlmssp_context);
 671         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 672         NTSTATUS nt_status;
 673         struct auth_usersupplied_info *user_info;
 674
 675         user_info = talloc(ntlmssp_state, struct auth_usersupplied_info);
 676         if (!user_info) {
 677                 return NT_STATUS_NO_MEMORY;
 678         }
 679
 680         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 681         user_info->flags = 0;
 682         user_info->mapped_state = false;
 683         user_info->client.account_name = ntlmssp_state->user;
 684         user_info->client.domain_name = ntlmssp_state->domain;
 685         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 686         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 687
 688         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 689         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 690         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 691         user_info->password.response.nt = ntlmssp_state->nt_resp;
 692         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 693
 694         nt_status = auth_context->check_password(auth_context,
 695                                                  gensec_ntlmssp,
 696                                                  user_info,
 697                                                  &gensec_ntlmssp->server_info);
 698         talloc_free(user_info);
 699         NT_STATUS_NOT_OK_RETURN(nt_status);
 700
 701         if (gensec_ntlmssp->server_info->user_session_key.length) {
 702                 DEBUG(10, ("Got NT session key of length %u\n",
 703                            (unsigned)gensec_ntlmssp->server_info->user_session_key.length));
 704                 *user_session_key = gensec_ntlmssp->server_info->user_session_key;
 705         }
 706         if (gensec_ntlmssp->server_info->lm_session_key.length) {
 707                 DEBUG(10, ("Got LM session key of length %u\n",
 708                            (unsigned)gensec_ntlmssp->server_info->lm_session_key.length));
 709                 *lm_session_key = gensec_ntlmssp->server_info->lm_session_key;
 710         }
 711         return nt_status;
 712 }
 713
 714 /**
 715  * Return the credentials of a logged on user, including session keys
 716  * etc.
 717  *
 718  * Only valid after a successful authentication
 719  *
 720  * May only be called once per authentication.
 721  *
 722  */
 723
 724 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 725                                      struct auth_session_info **session_info)
 726 {
 727         NTSTATUS nt_status;
 728         struct gensec_ntlmssp_context *gensec_ntlmssp =
 729                 talloc_get_type_abort(gensec_security->private_data,
 730                                       struct gensec_ntlmssp_context);
 731         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 732
 733         nt_status = gensec_generate_session_info(ntlmssp_state,
 734                                                  gensec_security,
 735                                                  gensec_ntlmssp->server_info,
 736                                                  session_info);
 737         NT_STATUS_NOT_OK_RETURN(nt_status);
 738
 739         (*session_info)->session_key = data_blob_talloc(*session_info,
 740                                                         ntlmssp_state->session_key.data,
 741                                                         ntlmssp_state->session_key.length);
 742
 743         return NT_STATUS_OK;
 744 }
 745
 746 /**
 747  * Start NTLMSSP on the server side
 748  *
 749  */
 750 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 751 {
 752         NTSTATUS nt_status;
 753         struct ntlmssp_state *ntlmssp_state;
 754         struct gensec_ntlmssp_context *gensec_ntlmssp;
 755
 756         nt_status = gensec_ntlmssp_start(gensec_security);
 757         NT_STATUS_NOT_OK_RETURN(nt_status);
 758
 759         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 760                                                struct gensec_ntlmssp_context);
 761         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 762
 763         ntlmssp_state->role = NTLMSSP_SERVER;
 764
 765         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 766
 767         ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx)
 768                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 769
 770         ntlmssp_state->neg_flags =
 771                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 772
 773         ntlmssp_state->lm_resp = data_blob(NULL, 0);
 774         ntlmssp_state->nt_resp = data_blob(NULL, 0);
 775
 776         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 777                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 778         }
 779
 780         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 781                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 782         }
 783
 784         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 785                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 786         }
 787
 788         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 789                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 790         }
 791
 792         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 793                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 794         }
 795
 796         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 797                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 798         }
 799         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 800                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 801         }
 802
 803         gensec_ntlmssp->auth_context = gensec_security->auth_context;
 804
 805         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 806         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 807         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 808         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 809         if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 810                 ntlmssp_state->server.is_standalone = true;
 811         } else {
 812                 ntlmssp_state->server.is_standalone = false;
 813         }
 814
 815         ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 816
 817         ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 818
 819         {
 820                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 821
 822                 /* Find out the DNS domain name */
 823                 dnsdomname[0] = '\0';
 824                 safe_strcpy(dnsdomname, lpcfg_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
 825
 826                 /* Find out the DNS host name */
 827                 safe_strcpy(dnsname, ntlmssp_state->server.netbios_name, sizeof(dnsname) - 1);
 828                 if (dnsdomname[0] != '\0') {
 829                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 830                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 831                 }
 832                 strlower_m(dnsname);
 833
 834                 ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state,
 835                                                                       dnsname);
 836                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 837
 838                 ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state,
 839                                                                         dnsdomname);
 840                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 841         }
 842
 843         return NT_STATUS_OK;
 844 }
 845