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