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