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 "auth/ntlmssp/ntlmssp.h"
  26 #include "auth/ntlmssp/msrpc_parse.h"
  27 #include "lib/crypto/crypto.h"
  28 #include "system/filesys.h"
  29 #include "libcli/auth/libcli_auth.h"
  30 #include "auth/credentials/credentials.h"
  31 #include "auth/gensec/gensec.h"
  32 #include "auth/auth.h"
  33 #include "param/param.h"
  34
  35 /**
  36  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  37  *
  38  */
  39
  40 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user)
  41 {
  42         if (!user) {
  43                 /* it should be at least "" */
  44                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  45                 return NT_STATUS_INVALID_PARAMETER;
  46         }
  47         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
  48         if (!gensec_ntlmssp_state->user) {
  49                 return NT_STATUS_NO_MEMORY;
  50         }
  51         return NT_STATUS_OK;
  52 }
  53
  54 /**
  55  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  56  *
  57  */
  58 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain)
  59 {
  60         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
  61         if (!gensec_ntlmssp_state->domain) {
  62                 return NT_STATUS_NO_MEMORY;
  63         }
  64         return NT_STATUS_OK;
  65 }
  66
  67 /**
  68  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  69  *
  70  */
  71 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation)
  72 {
  73         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
  74         if (!gensec_ntlmssp_state->workstation) {
  75                 return NT_STATUS_NO_MEMORY;
  76         }
  77         return NT_STATUS_OK;
  78 }
  79
  80 /**
  81  * Determine correct target name flags for reply, given server role
  82  * and negotiated flags
  83  *
  84  * @param gensec_ntlmssp_state NTLMSSP State
  85  * @param neg_flags The flags from the packet
  86  * @param chal_flags The flags to be set in the reply packet
  87  * @return The 'target name' string.
  88  */
  89
  90 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  91                                        uint32_t neg_flags, uint32_t *chal_flags)
  92 {
  93         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  94                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
  95                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  96                 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) {
  97                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  98                         return gensec_ntlmssp_state->server_name;
  99                 } else {
 100                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 101                         return gensec_ntlmssp_state->domain;
 102                 };
 103         } else {
 104                 return "";
 105         }
 106 }
 107
 108
 109
 110 /**
 111  * Next state function for the Negotiate packet
 112  *
 113  * @param gensec_security GENSEC state
 114  * @param out_mem_ctx Memory context for *out
 115  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 116  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 117  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 118  */
 119
 120 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 121                                   TALLOC_CTX *out_mem_ctx,
 122                                   const DATA_BLOB in, DATA_BLOB *out)
 123 {
 124         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 125         DATA_BLOB struct_blob;
 126         char dnsname[MAXHOSTNAMELEN], dnsdomname[MAXHOSTNAMELEN];
 127         const char *p;
 128         uint32_t neg_flags = 0;
 129         uint32_t ntlmssp_command, chal_flags;
 130         const uint8_t *cryptkey;
 131         const char *target_name;
 132
 133         /* parse the NTLMSSP packet */
 134 #if 0
 135         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 136 #endif
 137
 138         if (in.length) {
 139                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx, &in, "Cdd",
 140                                                          "NTLMSSP",
 141                                                          &ntlmssp_command,
 142                                                          &neg_flags)) {
 143                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 144                                 "NTLMSSP Negotiate of length %u:\n",
 145                                 (unsigned int)in.length ));
 146                         dump_data(2, in.data, in.length);
 147                         return NT_STATUS_INVALID_PARAMETER;
 148                 }
 149                 debug_ntlmssp_flags(neg_flags);
 150         }
 151
 152         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 153
 154         /* Ask our caller what challenge they would like in the packet */
 155         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
 156
 157         /* Check if we may set the challenge */
 158         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 159                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 160         }
 161
 162         /* The flags we send back are not just the negotiated flags,
 163          * they are also 'what is in this packet'.  Therfore, we
 164          * operate on 'chal_flags' from here on
 165          */
 166
 167         chal_flags = gensec_ntlmssp_state->neg_flags;
 168
 169         /* get the right name to fill in as 'target' */
 170         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 171                                           neg_flags, &chal_flags);
 172         if (target_name == NULL)
 173                 return NT_STATUS_INVALID_PARAMETER;
 174
 175         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 176         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 177
 178         dnsname[0] = '\0';
 179         if (gethostname(dnsname, sizeof(dnsname)) == -1) {
 180                 DEBUG(0,("gethostname failed\n"));
 181                 return NT_STATUS_UNSUCCESSFUL;
 182         }
 183
 184         /* This should be a 'netbios domain -> DNS domain' mapping */
 185         p = strchr(dnsname, '.');
 186         if (p != NULL) {
 187                 safe_strcpy(dnsdomname, p+1, sizeof(dnsdomname));
 188                 strlower_m(dnsdomname);
 189         } else {
 190                 dnsdomname[0] = '\0';
 191         }
 192
 193         /* This creates the 'blob' of names that appears at the end of the packet */
 194         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 195         {
 196                 const char *target_name_dns = "";
 197                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 198                         target_name_dns = dnsdomname;
 199                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 200                         target_name_dns = dnsname;
 201                 }
 202
 203                 msrpc_gen(out_mem_ctx,
 204                           &struct_blob, "aaaaa",
 205                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 206                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
 207                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 208                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 209                           0, "");
 210         } else {
 211                 struct_blob = data_blob(NULL, 0);
 212         }
 213
 214         {
 215                 /* Marshel the packet in the right format, be it unicode or ASCII */
 216                 const char *gen_string;
 217                 if (gensec_ntlmssp_state->unicode) {
 218                         gen_string = "CdUdbddB";
 219                 } else {
 220                         gen_string = "CdAdbddB";
 221                 }
 222
 223                 msrpc_gen(out_mem_ctx,
 224                           out, gen_string,
 225                           "NTLMSSP",
 226                           NTLMSSP_CHALLENGE,
 227                           target_name,
 228                           chal_flags,
 229                           cryptkey, 8,
 230                           0, 0,
 231                           struct_blob.data, struct_blob.length);
 232         }
 233
 234         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 235
 236         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 237 }
 238
 239 /**
 240  * Next state function for the Authenticate packet
 241  *
 242  * @param gensec_ntlmssp_state NTLMSSP State
 243  * @param request The request, as a DATA_BLOB
 244  * @return Errors or NT_STATUS_OK.
 245  */
 246
 247 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 248                                        const DATA_BLOB request)
 249 {
 250         uint32_t ntlmssp_command, auth_flags;
 251         NTSTATUS nt_status;
 252
 253         uint8_t session_nonce_hash[16];
 254
 255         const char *parse_string;
 256         char *domain = NULL;
 257         char *user = NULL;
 258         char *workstation = NULL;
 259
 260 #if 0
 261         file_save("ntlmssp_auth.dat", request.data, request.length);
 262 #endif
 263
 264         if (gensec_ntlmssp_state->unicode) {
 265                 parse_string = "CdBBUUUBd";
 266         } else {
 267                 parse_string = "CdBBAAABd";
 268         }
 269
 270         /* zero these out */
 271         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 272         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 273         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 274
 275         gensec_ntlmssp_state->user = NULL;
 276         gensec_ntlmssp_state->domain = NULL;
 277         gensec_ntlmssp_state->workstation = NULL;
 278
 279         /* now the NTLMSSP encoded auth hashes */
 280         if (!msrpc_parse(gensec_ntlmssp_state,
 281                          &request, parse_string,
 282                          "NTLMSSP",
 283                          &ntlmssp_command,
 284                          &gensec_ntlmssp_state->lm_resp,
 285                          &gensec_ntlmssp_state->nt_resp,
 286                          &domain,
 287                          &user,
 288                          &workstation,
 289                          &gensec_ntlmssp_state->encrypted_session_key,
 290                          &auth_flags)) {
 291                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 292                 dump_data(10, request.data, request.length);
 293
 294                 /* zero this out */
 295                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 296                 auth_flags = 0;
 297
 298                 /* Try again with a shorter string (Win9X truncates this packet) */
 299                 if (gensec_ntlmssp_state->unicode) {
 300                         parse_string = "CdBBUUU";
 301                 } else {
 302                         parse_string = "CdBBAAA";
 303                 }
 304
 305                 /* now the NTLMSSP encoded auth hashes */
 306                 if (!msrpc_parse(gensec_ntlmssp_state,
 307                                  &request, parse_string,
 308                                  "NTLMSSP",
 309                                  &ntlmssp_command,
 310                                  &gensec_ntlmssp_state->lm_resp,
 311                                  &gensec_ntlmssp_state->nt_resp,
 312                                  &domain,
 313                                  &user,
 314                                  &workstation)) {
 315                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 316                         dump_data(2, request.data, request.length);
 317
 318                         return NT_STATUS_INVALID_PARAMETER;
 319                 }
 320         }
 321
 322         if (auth_flags)
 323                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 324
 325         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 326                 /* zero this out */
 327                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 328                 return nt_status;
 329         }
 330
 331         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 332                 /* zero this out */
 333                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 334                 return nt_status;
 335         }
 336
 337         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 338                 /* zero this out */
 339                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 340                 return nt_status;
 341         }
 342
 343         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 344                  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));
 345
 346 #if 0
 347         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 348         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 349 #endif
 350
 351         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 352            client challenge
 353
 354            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 355         */
 356         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 357                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 358                         struct MD5Context md5_session_nonce_ctx;
 359                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 360                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 361
 362                         gensec_ntlmssp_state->doing_ntlm2 = True;
 363
 364                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 365                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 366
 367                         MD5Init(&md5_session_nonce_ctx);
 368                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 369                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 370
 371                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 372                                                                session_nonce_hash, 8);
 373
 374                         /* LM response is no longer useful, zero it out */
 375                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 376
 377                         /* We changed the effective challenge - set it */
 378                         if (!NT_STATUS_IS_OK(nt_status =
 379                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 380                                                                                  &gensec_ntlmssp_state->chal))) {
 381                                 /* zero this out */
 382                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 383                                 return nt_status;
 384                         }
 385
 386                         /* LM Key is incompatible... */
 387                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 388                 }
 389         }
 390         return NT_STATUS_OK;
 391 }
 392
 393 /**
 394  * Next state function for the Authenticate packet
 395  * (after authentication - figures out the session keys etc)
 396  *
 397  * @param gensec_ntlmssp_state NTLMSSP State
 398  * @return Errors or NT_STATUS_OK.
 399  */
 400
 401 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 402                                         DATA_BLOB *user_session_key,
 403                                         DATA_BLOB *lm_session_key)
 404 {
 405         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 406         NTSTATUS nt_status;
 407         DATA_BLOB session_key = data_blob(NULL, 0);
 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 (gensec_ntlmssp_state->doing_ntlm2) {
 417                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 418                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 419                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 420                                  sizeof(gensec_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 ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 429                 /* Ensure we can never get here on NTLMv2 */
 430                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 431
 432                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 433                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 434                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 435                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_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(gensec_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                         gensec_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 = *user_session_key;
 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                 gensec_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 = *lm_session_key;
 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                 gensec_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                 gensec_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 (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 485                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 486                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 487                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 488                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 489                                   (unsigned)gensec_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                         gensec_ntlmssp_state->session_key = session_key;
 495                 } else {
 496                         dump_data_pw("KEY_EXCH session key (enc):\n",
 497                                      gensec_ntlmssp_state->encrypted_session_key.data,
 498                                      gensec_ntlmssp_state->encrypted_session_key.length);
 499                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 500                                       session_key.data,
 501                                       gensec_ntlmssp_state->encrypted_session_key.length);
 502                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 503                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 504                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 505                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 506                                      gensec_ntlmssp_state->encrypted_session_key.length);
 507                 }
 508         } else {
 509                 gensec_ntlmssp_state->session_key = session_key;
 510         }
 511
 512         /* keep the session key around on the new context */
 513         talloc_steal(gensec_ntlmssp_state, session_key.data);
 514
 515         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 516             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 517                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 518         } else {
 519                 nt_status = NT_STATUS_OK;
 520         }
 521
 522         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 523
 524         /* allow arbitarily many authentications, but watch that this will cause a
 525            memory leak, until the gensec_ntlmssp_state is shutdown
 526         */
 527
 528         if (gensec_ntlmssp_state->server_multiple_authentications) {
 529                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 530         } else {
 531                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 532         }
 533
 534         return nt_status;
 535 }
 536
 537
 538 /**
 539  * Next state function for the Authenticate packet
 540  *
 541  * @param gensec_security GENSEC state
 542  * @param out_mem_ctx Memory context for *out
 543  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 544  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 545  * @return Errors or NT_STATUS_OK if authentication sucessful
 546  */
 547
 548 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 549                              TALLOC_CTX *out_mem_ctx,
 550                              const DATA_BLOB in, DATA_BLOB *out)
 551 {
 552         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 553         DATA_BLOB user_session_key = data_blob(NULL, 0);
 554         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 555         NTSTATUS nt_status;
 556
 557         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
 558         if (!mem_ctx) {
 559                 return NT_STATUS_NO_MEMORY;
 560         }
 561
 562         /* zero the outbound NTLMSSP packet */
 563         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 564
 565         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 566                 talloc_free(mem_ctx);
 567                 return nt_status;
 568         }
 569
 570         /*
 571          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 572          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 573          * smb.conf file) and no NTLMv2 response was sent then the password check
 574          * will fail here. JRA.
 575          */
 576
 577         /* Finally, actually ask if the password is OK */
 578
 579         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
 580                                                                               &user_session_key, &lm_session_key))) {
 581                 talloc_free(mem_ctx);
 582                 return nt_status;
 583         }
 584
 585         if (gensec_security->want_features
 586             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
 587                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 588                 talloc_free(mem_ctx);
 589                 return nt_status;
 590         } else {
 591                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 592                 talloc_free(mem_ctx);
 593                 return NT_STATUS_OK;
 594         }
 595 }
 596
 597 /**
 598  * Return the challenge as determined by the authentication subsystem
 599  * @return an 8 byte random challenge
 600  */
 601
 602 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 603 {
 604         NTSTATUS status;
 605         const uint8_t *chal;
 606
 607         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 608         if (!NT_STATUS_IS_OK(status)) {
 609                 return NULL;
 610         }
 611
 612         return chal;
 613 }
 614
 615 /**
 616  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 617  *
 618  * @return If the effective challenge used by the auth subsystem may be modified
 619  */
 620 static BOOL auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 621 {
 622         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 623 }
 624
 625 /**
 626  * NTLM2 authentication modifies the effective challenge,
 627  * @param challenge The new challenge value
 628  */
 629 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 630 {
 631         NTSTATUS nt_status;
 632         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 633         const uint8_t *chal;
 634
 635         if (challenge->length != 8) {
 636                 return NT_STATUS_INVALID_PARAMETER;
 637         }
 638
 639         chal = challenge->data;
 640
 641         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 642
 643         return nt_status;
 644 }
 645
 646 /**
 647  * Check the password on an NTLMSSP login.
 648  *
 649  * Return the session keys used on the connection.
 650  */
 651
 652 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 653                                             TALLOC_CTX *mem_ctx,
 654                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 655 {
 656         NTSTATUS nt_status;
 657         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
 658         if (!user_info) {
 659                 return NT_STATUS_NO_MEMORY;
 660         }
 661
 662         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 663         user_info->flags = 0;
 664         user_info->mapped_state = False;
 665         user_info->client.account_name = gensec_ntlmssp_state->user;
 666         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 667         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 668         user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
 669
 670         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 671         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 672         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 673         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 674         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 675
 676         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx,
 677                                         user_info, &gensec_ntlmssp_state->server_info);
 678         talloc_free(user_info);
 679         NT_STATUS_NOT_OK_RETURN(nt_status);
 680
 681         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
 682
 683         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 684                 DEBUG(10, ("Got NT session key of length %u\n",
 685                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 686                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
 687                         return NT_STATUS_NO_MEMORY;
 688                 }
 689
 690                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
 691         }
 692         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 693                 DEBUG(10, ("Got LM session key of length %u\n",
 694                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 695                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
 696                         return NT_STATUS_NO_MEMORY;
 697                 }
 698
 699                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
 700         }
 701         return nt_status;
 702 }
 703
 704 /**
 705  * Return the credentials of a logged on user, including session keys
 706  * etc.
 707  *
 708  * Only valid after a successful authentication
 709  *
 710  * May only be called once per authentication.
 711  *
 712  */
 713
 714 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 715                                      struct auth_session_info **session_info)
 716 {
 717         NTSTATUS nt_status;
 718         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 719
 720         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info, session_info);
 721         NT_STATUS_NOT_OK_RETURN(nt_status);
 722
 723         (*session_info)->session_key = data_blob_talloc(*session_info,
 724                                                         gensec_ntlmssp_state->session_key.data,
 725                                                         gensec_ntlmssp_state->session_key.length);
 726
 727         return NT_STATUS_OK;
 728 }
 729
 730 /**
 731  * Start NTLMSSP on the server side
 732  *
 733  */
 734 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 735 {
 736         NTSTATUS nt_status;
 737         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 738
 739         nt_status = gensec_ntlmssp_start(gensec_security);
 740         NT_STATUS_NOT_OK_RETURN(nt_status);
 741
 742         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 743
 744         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 745
 746         gensec_ntlmssp_state->workstation = NULL;
 747         gensec_ntlmssp_state->server_name = lp_netbios_name(global_loadparm);
 748
 749         gensec_ntlmssp_state->domain = lp_workgroup(global_loadparm);
 750
 751         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 752
 753         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(global_loadparm)
 754                                           && lp_parm_bool(global_loadparm, NULL, "ntlmssp_server", "allow_lm_key", false));
 755
 756         gensec_ntlmssp_state->server_multiple_authentications = False;
 757
 758         gensec_ntlmssp_state->neg_flags =
 759                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
 760
 761         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 762         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 763         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 764
 765         if (lp_parm_bool(global_loadparm, NULL, "ntlmssp_server", "128bit", true)) {
 766                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 767         }
 768
 769         if (lp_parm_bool(global_loadparm, NULL, "ntlmssp_server", "56bit", true)) {
 770                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 771         }
 772
 773         if (lp_parm_bool(global_loadparm, NULL, "ntlmssp_server", "keyexchange", true)) {
 774                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 775         }
 776
 777         if (lp_parm_bool(global_loadparm, NULL, "ntlmssp_server", "alwayssign", true)) {
 778                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 779         }
 780
 781         if (lp_parm_bool(global_loadparm, NULL, "ntlmssp_server", "ntlm2", true)) {
 782                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 783         }
 784
 785         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 786                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 787         }
 788         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 789                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 790         }
 791
 792         nt_status = auth_context_create(gensec_ntlmssp_state,
 793                                         gensec_security->event_ctx,
 794                                         gensec_security->msg_ctx,
 795                                         &gensec_ntlmssp_state->auth_context);
 796         NT_STATUS_NOT_OK_RETURN(nt_status);
 797
 798         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 799         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 800         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 801         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 802         gensec_ntlmssp_state->server_role = lp_server_role(global_loadparm);
 803
 804         return NT_STATUS_OK;
 805 }
 806