source4/auth/ntlmssp/ntlmssp_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, client server side parsing
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "auth/auth.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "lib/crypto/crypto.h"
  29 #include "pstring.h"
  30
  31 /**
  32  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  33  *
  34  */
  35
  36 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user)
  37 {
  38         if (!user) {
  39                 /* it should be at least "" */
  40                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  41                 return NT_STATUS_INVALID_PARAMETER;
  42         }
  43         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
  44         if (!gensec_ntlmssp_state->user) {
  45                 return NT_STATUS_NO_MEMORY;
  46         }
  47         return NT_STATUS_OK;
  48 }
  49
  50 /**
  51  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  52  *
  53  */
  54 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain)
  55 {
  56         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
  57         if (!gensec_ntlmssp_state->domain) {
  58                 return NT_STATUS_NO_MEMORY;
  59         }
  60         return NT_STATUS_OK;
  61 }
  62
  63 /**
  64  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  65  *
  66  */
  67 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation)
  68 {
  69         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
  70         if (!gensec_ntlmssp_state->workstation) {
  71                 return NT_STATUS_NO_MEMORY;
  72         }
  73         return NT_STATUS_OK;
  74 }
  75
  76 /**
  77  * Determine correct target name flags for reply, given server role
  78  * and negotiated flags
  79  *
  80  * @param gensec_ntlmssp_state NTLMSSP State
  81  * @param neg_flags The flags from the packet
  82  * @param chal_flags The flags to be set in the reply packet
  83  * @return The 'target name' string.
  84  */
  85
  86 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  87                                        uint32_t neg_flags, uint32_t *chal_flags)
  88 {
  89         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  90                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
  91                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  92                 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) {
  93                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  94                         return gensec_ntlmssp_state->server_name;
  95                 } else {
  96                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
  97                         return gensec_ntlmssp_state->get_domain();
  98                 };
  99         } else {
 100                 return "";
 101         }
 102 }
 103
 104 /**
 105  * Next state function for the Negotiate packet
 106  *
 107  * @param gensec_security GENSEC state
 108  * @param out_mem_ctx Memory context for *out
 109  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 110  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 111  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 112  */
 113
 114 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 115                                   TALLOC_CTX *out_mem_ctx,
 116                                   const DATA_BLOB in, DATA_BLOB *out)
 117 {
 118         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 119         DATA_BLOB struct_blob;
 120         fstring dnsname, dnsdomname;
 121         uint32_t neg_flags = 0;
 122         uint32_t ntlmssp_command, chal_flags;
 123         char *cliname=NULL, *domname=NULL;
 124         const uint8_t *cryptkey;
 125         const char *target_name;
 126
 127         /* parse the NTLMSSP packet */
 128 #if 0
 129         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 130 #endif
 131
 132         if (in.length) {
 133                 if (!msrpc_parse(out_mem_ctx,
 134                                  &in, "CddAA",
 135                                  "NTLMSSP",
 136                                  &ntlmssp_command,
 137                                  &neg_flags,
 138                                  &cliname,
 139                                  &domname)) {
 140                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP:\n"));
 141                         dump_data(2, in.data, in.length);
 142                         return NT_STATUS_INVALID_PARAMETER;
 143                 }
 144
 145                 debug_ntlmssp_flags(neg_flags);
 146         }
 147
 148         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 149
 150         /* Ask our caller what challenge they would like in the packet */
 151         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
 152
 153         /* Check if we may set the challenge */
 154         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 155                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 156         }
 157
 158         /* The flags we send back are not just the negotiated flags,
 159          * they are also 'what is in this packet'.  Therfore, we
 160          * operate on 'chal_flags' from here on
 161          */
 162
 163         chal_flags = gensec_ntlmssp_state->neg_flags;
 164
 165         /* get the right name to fill in as 'target' */
 166         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 167                                           neg_flags, &chal_flags);
 168         if (target_name == NULL)
 169                 return NT_STATUS_INVALID_PARAMETER;
 170
 171         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 172         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 173
 174         /* This should be a 'netbios domain -> DNS domain' mapping */
 175         dnsdomname[0] = '\0';
 176         get_mydomname(dnsdomname);
 177         strlower_m(dnsdomname);
 178
 179         dnsname[0] = '\0';
 180         get_myfullname(dnsname);
 181
 182         /* This creates the 'blob' of names that appears at the end of the packet */
 183         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 184         {
 185                 const char *target_name_dns = "";
 186                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 187                         target_name_dns = dnsdomname;
 188                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 189                         target_name_dns = dnsname;
 190                 }
 191
 192                 msrpc_gen(out_mem_ctx,
 193                           &struct_blob, "aaaaa",
 194                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 195                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
 196                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 197                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 198                           0, "");
 199         } else {
 200                 struct_blob = data_blob(NULL, 0);
 201         }
 202
 203         {
 204                 /* Marshel the packet in the right format, be it unicode or ASCII */
 205                 const char *gen_string;
 206                 if (gensec_ntlmssp_state->unicode) {
 207                         gen_string = "CdUdbddB";
 208                 } else {
 209                         gen_string = "CdAdbddB";
 210                 }
 211
 212                 msrpc_gen(out_mem_ctx,
 213                           out, gen_string,
 214                           "NTLMSSP",
 215                           NTLMSSP_CHALLENGE,
 216                           target_name,
 217                           chal_flags,
 218                           cryptkey, 8,
 219                           0, 0,
 220                           struct_blob.data, struct_blob.length);
 221         }
 222
 223         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 224
 225         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 226 }
 227
 228 /**
 229  * Next state function for the Authenticate packet
 230  *
 231  * @param gensec_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 gensec_ntlmssp_state *gensec_ntlmssp_state,
 237                                        const DATA_BLOB request)
 238 {
 239         uint32_t ntlmssp_command, auth_flags;
 240         NTSTATUS nt_status;
 241
 242         uint8_t session_nonce_hash[16];
 243
 244         const char *parse_string;
 245         char *domain = NULL;
 246         char *user = NULL;
 247         char *workstation = NULL;
 248
 249 #if 0
 250         file_save("ntlmssp_auth.dat", request.data, request.length);
 251 #endif
 252
 253         if (gensec_ntlmssp_state->unicode) {
 254                 parse_string = "CdBBUUUBd";
 255         } else {
 256                 parse_string = "CdBBAAABd";
 257         }
 258
 259         /* zero these out */
 260         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 261         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 262         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 263
 264         gensec_ntlmssp_state->user = NULL;
 265         gensec_ntlmssp_state->domain = NULL;
 266         gensec_ntlmssp_state->workstation = NULL;
 267
 268         /* now the NTLMSSP encoded auth hashes */
 269         if (!msrpc_parse(gensec_ntlmssp_state,
 270                          &request, parse_string,
 271                          "NTLMSSP",
 272                          &ntlmssp_command,
 273                          &gensec_ntlmssp_state->lm_resp,
 274                          &gensec_ntlmssp_state->nt_resp,
 275                          &domain,
 276                          &user,
 277                          &workstation,
 278                          &gensec_ntlmssp_state->encrypted_session_key,
 279                          &auth_flags)) {
 280                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 281                 dump_data(10, request.data, request.length);
 282
 283                 /* zero this out */
 284                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 285                 auth_flags = 0;
 286
 287                 /* Try again with a shorter string (Win9X truncates this packet) */
 288                 if (gensec_ntlmssp_state->unicode) {
 289                         parse_string = "CdBBUUU";
 290                 } else {
 291                         parse_string = "CdBBAAA";
 292                 }
 293
 294                 /* now the NTLMSSP encoded auth hashes */
 295                 if (!msrpc_parse(gensec_ntlmssp_state,
 296                                  &request, parse_string,
 297                                  "NTLMSSP",
 298                                  &ntlmssp_command,
 299                                  &gensec_ntlmssp_state->lm_resp,
 300                                  &gensec_ntlmssp_state->nt_resp,
 301                                  &domain,
 302                                  &user,
 303                                  &workstation)) {
 304                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 305                         dump_data(2, request.data, request.length);
 306
 307                         return NT_STATUS_INVALID_PARAMETER;
 308                 }
 309         }
 310
 311         if (auth_flags)
 312                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 313
 314         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 315                 /* zero this out */
 316                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 317                 return nt_status;
 318         }
 319
 320         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 321                 /* zero this out */
 322                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 323                 return nt_status;
 324         }
 325
 326         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 327                 /* zero this out */
 328                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 329                 return nt_status;
 330         }
 331
 332         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 333                  gensec_ntlmssp_state->user, gensec_ntlmssp_state->domain, gensec_ntlmssp_state->workstation, (unsigned long)gensec_ntlmssp_state->lm_resp.length, (unsigned long)gensec_ntlmssp_state->nt_resp.length));
 334
 335 #if 0
 336         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 337         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 338 #endif
 339
 340         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 341            client challenge
 342
 343            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 344         */
 345         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 346                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 347                         struct MD5Context md5_session_nonce_ctx;
 348                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 349                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 350
 351                         gensec_ntlmssp_state->doing_ntlm2 = True;
 352
 353                         memcpy(gensec_ntlmssp_state->v.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 354                         memcpy(&gensec_ntlmssp_state->v.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 355
 356                         MD5Init(&md5_session_nonce_ctx);
 357                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->v.ntlm2.session_nonce, 16);
 358                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 359
 360                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 361                                                                session_nonce_hash, 8);
 362
 363                         /* LM response is no longer useful, zero it out */
 364                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 365
 366                         /* We changed the effective challenge - set it */
 367                         if (!NT_STATUS_IS_OK(nt_status =
 368                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 369                                                                           &gensec_ntlmssp_state->chal))) {
 370                                 /* zero this out */
 371                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 372                                 return nt_status;
 373                         }
 374
 375                         /* LM Key is incompatible... */
 376                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 377                 }
 378         }
 379         return NT_STATUS_OK;
 380 }
 381
 382 /**
 383  * Next state function for the Authenticate packet
 384  * (after authentication - figures out the session keys etc)
 385  *
 386  * @param gensec_ntlmssp_state NTLMSSP State
 387  * @return Errors or NT_STATUS_OK.
 388  */
 389
 390 static NTSTATUS ntlmssp_server_postauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 391                                         DATA_BLOB *user_session_key,
 392                                         DATA_BLOB *lm_session_key)
 393 {
 394         NTSTATUS nt_status;
 395         DATA_BLOB session_key = data_blob(NULL, 0);
 396
 397         if (user_session_key)
 398                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 399
 400         if (lm_session_key)
 401                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 402
 403         /* Handle the different session key derivation for NTLM2 */
 404         if (gensec_ntlmssp_state->doing_ntlm2) {
 405                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 406                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 407                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->v.ntlm2.session_nonce,
 408                                  sizeof(gensec_ntlmssp_state->v.ntlm2.session_nonce), session_key.data);
 409                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 410                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 411
 412                 } else {
 413                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 414                         session_key = data_blob(NULL, 0);
 415                 }
 416         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 417                 /* Ensure we can never get here on NTLMv2 */
 418                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 419
 420                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 421                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 422                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 423                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 424                                                           session_key.data);
 425                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 426                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 427                         } else {
 428
 429                                 /* When there is no LM response, just use zeros */
 430                                 static const uint8_t zeros[24];
 431                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 432                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 433                                                           session_key.data);
 434                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 435                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 436                         }
 437                 } else {
 438                         /* LM Key not selected */
 439                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 440
 441                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 442                         session_key = data_blob(NULL, 0);
 443                 }
 444
 445         } else if (user_session_key && user_session_key->data) {
 446                 session_key = *user_session_key;
 447                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 448                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 449
 450                 /* LM Key not selected */
 451                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 452
 453         } else if (lm_session_key && lm_session_key->data) {
 454                 /* Very weird to have LM key, but no user session key, but anyway.. */
 455                 session_key = *lm_session_key;
 456                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 457                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 458
 459                 /* LM Key not selected */
 460                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 461
 462         } else {
 463                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 464                 session_key = data_blob(NULL, 0);
 465
 466                 /* LM Key not selected */
 467                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 468         }
 469
 470         /* With KEY_EXCH, the client supplies the proposed session key,
 471            but encrypts it with the long-term key */
 472         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 473                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 474                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 475                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 476                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 477                                   gensec_ntlmssp_state->encrypted_session_key.length));
 478                         return NT_STATUS_INVALID_PARAMETER;
 479                 } else if (!session_key.data || session_key.length != 16) {
 480                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 481                                   session_key.length));
 482                         gensec_ntlmssp_state->session_key = session_key;
 483                 } else {
 484                         dump_data_pw("KEY_EXCH session key (enc):\n",
 485                                      gensec_ntlmssp_state->encrypted_session_key.data,
 486                                      gensec_ntlmssp_state->encrypted_session_key.length);
 487                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 488                                       session_key.data,
 489                                       gensec_ntlmssp_state->encrypted_session_key.length);
 490                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 491                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 492                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 493                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 494                                      gensec_ntlmssp_state->encrypted_session_key.length);
 495                 }
 496         } else {
 497                 gensec_ntlmssp_state->session_key = session_key;
 498         }
 499
 500         /* The server might need us to use a partial-strength session key */
 501         ntlmssp_weaken_keys(gensec_ntlmssp_state);
 502
 503         nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 504
 505         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 506
 507         /* allow arbitarily many authentications, but watch that this will cause a
 508            memory leak, until the gensec_ntlmssp_state is shutdown
 509         */
 510
 511         if (gensec_ntlmssp_state->server_multiple_authentications) {
 512                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 513         } else {
 514                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 515         }
 516
 517         return nt_status;
 518 }
 519
 520
 521 /**
 522  * Next state function for the Authenticate packet
 523  *
 524  * @param gensec_security GENSEC state
 525  * @param out_mem_ctx Memory context for *out
 526  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 527  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 528  * @return Errors or NT_STATUS_OK if authentication sucessful
 529  */
 530
 531 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 532                              TALLOC_CTX *out_mem_ctx,
 533                              const DATA_BLOB in, DATA_BLOB *out)
 534 {
 535         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 536         DATA_BLOB user_session_key = data_blob(NULL, 0);
 537         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 538         NTSTATUS nt_status;
 539
 540         /* zero the outbound NTLMSSP packet */
 541         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 542
 543         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 544                 return nt_status;
 545         }
 546
 547         /*
 548          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 549          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 550          * smb.conf file) and no NTLMv2 response was sent then the password check
 551          * will fail here. JRA.
 552          */
 553
 554         /* Finally, actually ask if the password is OK */
 555
 556         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state,
 557                                                                        &user_session_key, &lm_session_key))) {
 558                 return nt_status;
 559         }
 560
 561         if (gensec_ntlmssp_state->server_use_session_keys) {
 562                 return ntlmssp_server_postauth(gensec_ntlmssp_state, &user_session_key, &lm_session_key);
 563         } else {
 564                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 565                 return NT_STATUS_OK;
 566         }
 567 }
 568
 569 /**
 570  * Return the challenge as determined by the authentication subsystem
 571  * @return an 8 byte random challenge
 572  */
 573
 574 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 575 {
 576         NTSTATUS status;
 577         const uint8_t *chal;
 578
 579         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 580         if (!NT_STATUS_IS_OK(status)) {
 581                 return NULL;
 582         }
 583
 584         return chal;
 585 }
 586
 587 /**
 588  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 589  *
 590  * @return If the effective challenge used by the auth subsystem may be modified
 591  */
 592 static BOOL auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 593 {
 594         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 595 }
 596
 597 /**
 598  * NTLM2 authentication modifies the effective challenge,
 599  * @param challenge The new challenge value
 600  */
 601 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 602 {
 603         NTSTATUS nt_status;
 604         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 605         const uint8_t *chal;
 606
 607         if (challenge->length != 8) {
 608                 return NT_STATUS_INVALID_PARAMETER;
 609         }
 610
 611         chal = challenge->data;
 612
 613         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 614
 615         return nt_status;
 616 }
 617
 618 /**
 619  * Check the password on an NTLMSSP login.
 620  *
 621  * Return the session keys used on the connection.
 622  */
 623
 624 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 625 {
 626         struct auth_usersupplied_info *user_info = NULL;
 627         NTSTATUS nt_status;
 628
 629         nt_status = make_user_info_map(gensec_ntlmssp_state,
 630                                        gensec_ntlmssp_state->user,
 631                                        gensec_ntlmssp_state->domain,
 632                                        gensec_ntlmssp_state->workstation,
 633                                        gensec_ntlmssp_state->lm_resp.data ? &gensec_ntlmssp_state->lm_resp : NULL,
 634                                        gensec_ntlmssp_state->nt_resp.data ? &gensec_ntlmssp_state->nt_resp : NULL,
 635                                        NULL, NULL, NULL, True,
 636                                        &user_info);
 637         NT_STATUS_NOT_OK_RETURN(nt_status);
 638
 639         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, gensec_ntlmssp_state,
 640                                         user_info, &gensec_ntlmssp_state->server_info);
 641         talloc_free(user_info);
 642         NT_STATUS_NOT_OK_RETURN(nt_status);
 643
 644         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 645                 DEBUG(10, ("Got NT session key of length %u\n", gensec_ntlmssp_state->server_info->user_session_key.length));
 646                 *user_session_key = data_blob_talloc(gensec_ntlmssp_state,
 647                                                    gensec_ntlmssp_state->server_info->user_session_key.data,
 648                                                    gensec_ntlmssp_state->server_info->user_session_key.length);
 649         }
 650         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 651                 DEBUG(10, ("Got LM session key of length %u\n", gensec_ntlmssp_state->server_info->lm_session_key.length));
 652                 *lm_session_key = data_blob_talloc(gensec_ntlmssp_state,
 653                                                    gensec_ntlmssp_state->server_info->lm_session_key.data,
 654                                                    gensec_ntlmssp_state->server_info->lm_session_key.length);
 655         }
 656         return nt_status;
 657 }
 658
 659 /**
 660  * Return the credentials of a logged on user, including session keys
 661  * etc.
 662  *
 663  * Only valid after a successful authentication
 664  *
 665  * May only be called once per authentication.
 666  *
 667  */
 668
 669 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 670                                      struct auth_session_info **session_info)
 671 {
 672         NTSTATUS nt_status;
 673         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 674
 675         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info, session_info);
 676         NT_STATUS_NOT_OK_RETURN(nt_status);
 677
 678         (*session_info)->session_key = data_blob_talloc(*session_info,
 679                                                         gensec_ntlmssp_state->session_key.data,
 680                                                         gensec_ntlmssp_state->session_key.length);
 681
 682         return NT_STATUS_OK;
 683 }
 684
 685 /**
 686  * Start NTLMSSP on the server side
 687  *
 688  */
 689 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 690 {
 691         NTSTATUS nt_status;
 692         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 693
 694         nt_status = gensec_ntlmssp_start(gensec_security);
 695         NT_STATUS_NOT_OK_RETURN(nt_status);
 696
 697         gensec_ntlmssp_state = gensec_security->private_data;
 698
 699         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 700
 701         gensec_ntlmssp_state->workstation = NULL;
 702         gensec_ntlmssp_state->server_name = lp_netbios_name();
 703
 704         gensec_ntlmssp_state->get_domain = lp_workgroup;
 705         gensec_ntlmssp_state->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 706
 707         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 708
 709         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth()
 710                                           && lp_parm_bool(-1, "ntlmssp_server", "allow_lm_key", False));
 711
 712         gensec_ntlmssp_state->server_use_session_keys = True;
 713         gensec_ntlmssp_state->server_multiple_authentications = False;
 714
 715         gensec_ntlmssp_state->neg_flags =
 716                 NTLMSSP_NEGOTIATE_NTLM;
 717
 718         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 719         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 720         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 721
 722         if (lp_parm_bool(-1, "ntlmssp_server", "128bit", True)) {
 723                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 724         }
 725
 726         if (lp_parm_bool(-1, "ntlmssp_server", "keyexchange", True)) {
 727                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 728         }
 729
 730         if (lp_parm_bool(-1, "ntlmssp_server", "ntlm2", True)) {
 731                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 732         }
 733
 734         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 735                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 736         }
 737         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 738                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 739         }
 740
 741         nt_status = auth_context_create(gensec_ntlmssp_state, lp_auth_methods(), &gensec_ntlmssp_state->auth_context);
 742         NT_STATUS_NOT_OK_RETURN(nt_status);
 743
 744         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 745         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 746         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 747         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 748         gensec_ntlmssp_state->server_role = lp_server_role();
 749
 750         return NT_STATUS_OK;
 751 }
 752