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->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 354                         memcpy(&gensec_ntlmssp_state->crypt.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->crypt.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_security *gensec_security,
 391                                         DATA_BLOB *user_session_key,
 392                                         DATA_BLOB *lm_session_key)
 393 {
 394         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 395         NTSTATUS nt_status;
 396         DATA_BLOB session_key = data_blob(NULL, 0);
 397
 398         if (user_session_key)
 399                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 400
 401         if (lm_session_key)
 402                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 403
 404         /* Handle the different session key derivation for NTLM2 */
 405         if (gensec_ntlmssp_state->doing_ntlm2) {
 406                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 407                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 408                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 409                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 410                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 411                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 412
 413                 } else {
 414                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 415                         session_key = data_blob(NULL, 0);
 416                 }
 417         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 418                 /* Ensure we can never get here on NTLMv2 */
 419                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 420
 421                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 422                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 423                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 424                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 425                                                           session_key.data);
 426                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 427                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 428                         } else {
 429
 430                                 /* When there is no LM response, just use zeros */
 431                                 static const uint8_t zeros[24];
 432                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 433                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 434                                                           session_key.data);
 435                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 436                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 437                         }
 438                 } else {
 439                         /* LM Key not selected */
 440                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 441
 442                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 443                         session_key = data_blob(NULL, 0);
 444                 }
 445
 446         } else if (user_session_key && user_session_key->data) {
 447                 session_key = *user_session_key;
 448                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 449                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 450
 451                 /* LM Key not selected */
 452                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 453
 454         } else if (lm_session_key && lm_session_key->data) {
 455                 /* Very weird to have LM key, but no user session key, but anyway.. */
 456                 session_key = *lm_session_key;
 457                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 458                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 459
 460                 /* LM Key not selected */
 461                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 462
 463         } else {
 464                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 465                 session_key = data_blob(NULL, 0);
 466
 467                 /* LM Key not selected */
 468                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 469         }
 470
 471         /* With KEY_EXCH, the client supplies the proposed session key,
 472            but encrypts it with the long-term key */
 473         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 474                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 475                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 476                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 477                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 478                                   gensec_ntlmssp_state->encrypted_session_key.length));
 479                         return NT_STATUS_INVALID_PARAMETER;
 480                 } else if (!session_key.data || session_key.length != 16) {
 481                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 482                                   session_key.length));
 483                         gensec_ntlmssp_state->session_key = session_key;
 484                 } else {
 485                         dump_data_pw("KEY_EXCH session key (enc):\n",
 486                                      gensec_ntlmssp_state->encrypted_session_key.data,
 487                                      gensec_ntlmssp_state->encrypted_session_key.length);
 488                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 489                                       session_key.data,
 490                                       gensec_ntlmssp_state->encrypted_session_key.length);
 491                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 492                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 493                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 494                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 495                                      gensec_ntlmssp_state->encrypted_session_key.length);
 496                 }
 497         } else {
 498                 gensec_ntlmssp_state->session_key = session_key;
 499         }
 500
 501         /* The server might need us to use a partial-strength session key */
 502         ntlmssp_weaken_keys(gensec_ntlmssp_state);
 503
 504         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 505             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 506                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 507         } else {
 508                 nt_status = NT_STATUS_OK;
 509         }
 510
 511         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 512
 513         /* allow arbitarily many authentications, but watch that this will cause a
 514            memory leak, until the gensec_ntlmssp_state is shutdown
 515         */
 516
 517         if (gensec_ntlmssp_state->server_multiple_authentications) {
 518                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 519         } else {
 520                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 521         }
 522
 523         return nt_status;
 524 }
 525
 526
 527 /**
 528  * Next state function for the Authenticate packet
 529  *
 530  * @param gensec_security GENSEC state
 531  * @param out_mem_ctx Memory context for *out
 532  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 533  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 534  * @return Errors or NT_STATUS_OK if authentication sucessful
 535  */
 536
 537 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 538                              TALLOC_CTX *out_mem_ctx,
 539                              const DATA_BLOB in, DATA_BLOB *out)
 540 {
 541         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 542         DATA_BLOB user_session_key = data_blob(NULL, 0);
 543         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 544         NTSTATUS nt_status;
 545
 546         /* zero the outbound NTLMSSP packet */
 547         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 548
 549         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 550                 return nt_status;
 551         }
 552
 553         /*
 554          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 555          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 556          * smb.conf file) and no NTLMv2 response was sent then the password check
 557          * will fail here. JRA.
 558          */
 559
 560         /* Finally, actually ask if the password is OK */
 561
 562         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state,
 563                                                                        &user_session_key, &lm_session_key))) {
 564                 return nt_status;
 565         }
 566
 567         if (gensec_ntlmssp_state->server_use_session_keys) {
 568                 return ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 569         } else {
 570                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 571                 return NT_STATUS_OK;
 572         }
 573 }
 574
 575 /**
 576  * Return the challenge as determined by the authentication subsystem
 577  * @return an 8 byte random challenge
 578  */
 579
 580 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 581 {
 582         NTSTATUS status;
 583         const uint8_t *chal;
 584
 585         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 586         if (!NT_STATUS_IS_OK(status)) {
 587                 return NULL;
 588         }
 589
 590         return chal;
 591 }
 592
 593 /**
 594  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 595  *
 596  * @return If the effective challenge used by the auth subsystem may be modified
 597  */
 598 static BOOL auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 599 {
 600         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 601 }
 602
 603 /**
 604  * NTLM2 authentication modifies the effective challenge,
 605  * @param challenge The new challenge value
 606  */
 607 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 608 {
 609         NTSTATUS nt_status;
 610         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 611         const uint8_t *chal;
 612
 613         if (challenge->length != 8) {
 614                 return NT_STATUS_INVALID_PARAMETER;
 615         }
 616
 617         chal = challenge->data;
 618
 619         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 620
 621         return nt_status;
 622 }
 623
 624 /**
 625  * Check the password on an NTLMSSP login.
 626  *
 627  * Return the session keys used on the connection.
 628  */
 629
 630 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 631 {
 632         struct auth_usersupplied_info *user_info = NULL;
 633         NTSTATUS nt_status;
 634
 635         nt_status = make_user_info_map(gensec_ntlmssp_state,
 636                                        gensec_ntlmssp_state->user,
 637                                        gensec_ntlmssp_state->domain,
 638                                        gensec_ntlmssp_state->workstation,
 639                                        gensec_ntlmssp_state->lm_resp.data ? &gensec_ntlmssp_state->lm_resp : NULL,
 640                                        gensec_ntlmssp_state->nt_resp.data ? &gensec_ntlmssp_state->nt_resp : NULL,
 641                                        NULL, NULL, NULL, True,
 642                                        &user_info);
 643         NT_STATUS_NOT_OK_RETURN(nt_status);
 644
 645         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, gensec_ntlmssp_state,
 646                                         user_info, &gensec_ntlmssp_state->server_info);
 647         talloc_free(user_info);
 648         NT_STATUS_NOT_OK_RETURN(nt_status);
 649
 650         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 651                 DEBUG(10, ("Got NT session key of length %u\n", gensec_ntlmssp_state->server_info->user_session_key.length));
 652                 *user_session_key = data_blob_talloc(gensec_ntlmssp_state,
 653                                                    gensec_ntlmssp_state->server_info->user_session_key.data,
 654                                                    gensec_ntlmssp_state->server_info->user_session_key.length);
 655         }
 656         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 657                 DEBUG(10, ("Got LM session key of length %u\n", gensec_ntlmssp_state->server_info->lm_session_key.length));
 658                 *lm_session_key = data_blob_talloc(gensec_ntlmssp_state,
 659                                                    gensec_ntlmssp_state->server_info->lm_session_key.data,
 660                                                    gensec_ntlmssp_state->server_info->lm_session_key.length);
 661         }
 662         return nt_status;
 663 }
 664
 665 /**
 666  * Return the credentials of a logged on user, including session keys
 667  * etc.
 668  *
 669  * Only valid after a successful authentication
 670  *
 671  * May only be called once per authentication.
 672  *
 673  */
 674
 675 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 676                                      struct auth_session_info **session_info)
 677 {
 678         NTSTATUS nt_status;
 679         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
 680
 681         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info, session_info);
 682         NT_STATUS_NOT_OK_RETURN(nt_status);
 683
 684         (*session_info)->session_key = data_blob_talloc(*session_info,
 685                                                         gensec_ntlmssp_state->session_key.data,
 686                                                         gensec_ntlmssp_state->session_key.length);
 687
 688         return NT_STATUS_OK;
 689 }
 690
 691 /**
 692  * Start NTLMSSP on the server side
 693  *
 694  */
 695 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 696 {
 697         NTSTATUS nt_status;
 698         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 699
 700         nt_status = gensec_ntlmssp_start(gensec_security);
 701         NT_STATUS_NOT_OK_RETURN(nt_status);
 702
 703         gensec_ntlmssp_state = gensec_security->private_data;
 704
 705         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 706
 707         gensec_ntlmssp_state->workstation = NULL;
 708         gensec_ntlmssp_state->server_name = lp_netbios_name();
 709
 710         gensec_ntlmssp_state->get_domain = lp_workgroup;
 711         gensec_ntlmssp_state->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 712
 713         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 714
 715         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth()
 716                                           && lp_parm_bool(-1, "ntlmssp_server", "allow_lm_key", False));
 717
 718         gensec_ntlmssp_state->server_use_session_keys = True;
 719         gensec_ntlmssp_state->server_multiple_authentications = False;
 720
 721         gensec_ntlmssp_state->neg_flags =
 722                 NTLMSSP_NEGOTIATE_NTLM;
 723
 724         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 725         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 726         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 727
 728         if (lp_parm_bool(-1, "ntlmssp_server", "128bit", True)) {
 729                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 730         }
 731
 732         if (lp_parm_bool(-1, "ntlmssp_server", "keyexchange", True)) {
 733                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 734         }
 735
 736         if (lp_parm_bool(-1, "ntlmssp_server", "ntlm2", True)) {
 737                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 738         }
 739
 740         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 741                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 742         }
 743         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 744                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 745         }
 746
 747         nt_status = auth_context_create(gensec_ntlmssp_state, lp_auth_methods(), &gensec_ntlmssp_state->auth_context);
 748         NT_STATUS_NOT_OK_RETURN(nt_status);
 749
 750         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 751         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 752         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 753         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 754         gensec_ntlmssp_state->server_role = lp_server_role();
 755
 756         return NT_STATUS_OK;
 757 }
 758