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 "libcli/auth/libcli_auth.h"
  29 #include "auth/credentials/credentials.h"
  30 #include "auth/gensec/gensec.h"
  31 #include "auth/auth.h"
  32 #include "auth/ntlm/auth_proto.h"
  33 #include "param/param.h"
  34 #include "auth/session_proto.h"
  35
  36 /**
  37  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  38  *
  39  */
  40
  41 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user)
  42 {
  43         if (!user) {
  44                 /* it should be at least "" */
  45                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  46                 return NT_STATUS_INVALID_PARAMETER;
  47         }
  48         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
  49         if (!gensec_ntlmssp_state->user) {
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52         return NT_STATUS_OK;
  53 }
  54
  55 /**
  56  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  57  *
  58  */
  59 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain)
  60 {
  61         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
  62         if (!gensec_ntlmssp_state->domain) {
  63                 return NT_STATUS_NO_MEMORY;
  64         }
  65         return NT_STATUS_OK;
  66 }
  67
  68 /**
  69  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  70  *
  71  */
  72 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation)
  73 {
  74         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
  75         if (!gensec_ntlmssp_state->workstation) {
  76                 return NT_STATUS_NO_MEMORY;
  77         }
  78         return NT_STATUS_OK;
  79 }
  80
  81 /**
  82  * Determine correct target name flags for reply, given server role
  83  * and negotiated flags
  84  *
  85  * @param gensec_ntlmssp_state NTLMSSP State
  86  * @param neg_flags The flags from the packet
  87  * @param chal_flags The flags to be set in the reply packet
  88  * @return The 'target name' string.
  89  */
  90
  91 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  92                                        uint32_t neg_flags, uint32_t *chal_flags)
  93 {
  94         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  95                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
  96                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  97                 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) {
  98                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  99                         return gensec_ntlmssp_state->server_name;
 100                 } else {
 101                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 102                         return gensec_ntlmssp_state->domain;
 103                 };
 104         } else {
 105                 return "";
 106         }
 107 }
 108
 109
 110
 111 /**
 112  * Next state function for the Negotiate packet
 113  *
 114  * @param gensec_security GENSEC state
 115  * @param out_mem_ctx Memory context for *out
 116  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 117  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 118  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 119  */
 120
 121 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 122                                   TALLOC_CTX *out_mem_ctx,
 123                                   const DATA_BLOB in, DATA_BLOB *out)
 124 {
 125         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 126         DATA_BLOB struct_blob;
 127         uint32_t neg_flags = 0;
 128         uint32_t ntlmssp_command, chal_flags;
 129         const uint8_t *cryptkey;
 130         const char *target_name;
 131
 132         /* parse the NTLMSSP packet */
 133 #if 0
 134         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 135 #endif
 136
 137         if (in.length) {
 138                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx,
 139                                  lp_iconv_convenience(gensec_security->lp_ctx),
 140                                                          &in, "Cdd",
 141                                                          "NTLMSSP",
 142                                                          &ntlmssp_command,
 143                                                          &neg_flags)) {
 144                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 145                                 "NTLMSSP Negotiate of length %u:\n",
 146                                 (unsigned int)in.length ));
 147                         dump_data(2, in.data, in.length);
 148                         return NT_STATUS_INVALID_PARAMETER;
 149                 }
 150                 debug_ntlmssp_flags(neg_flags);
 151         }
 152
 153         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 154
 155         /* Ask our caller what challenge they would like in the packet */
 156         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
 157         if (!cryptkey) {
 158                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
 159                 return NT_STATUS_INTERNAL_ERROR;
 160         }
 161
 162         /* Check if we may set the challenge */
 163         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 164                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 165         }
 166
 167         /* The flags we send back are not just the negotiated flags,
 168          * they are also 'what is in this packet'.  Therfore, we
 169          * operate on 'chal_flags' from here on
 170          */
 171
 172         chal_flags = gensec_ntlmssp_state->neg_flags;
 173
 174         /* get the right name to fill in as 'target' */
 175         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 176                                           neg_flags, &chal_flags);
 177         if (target_name == NULL)
 178                 return NT_STATUS_INVALID_PARAMETER;
 179
 180         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 181         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 182
 183         /* This creates the 'blob' of names that appears at the end of the packet */
 184         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
 185                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 186                 const char *target_name_dns = "";
 187
 188                 /* Find out the DNS domain name */
 189                 dnsdomname[0] = '\0';
 190                 safe_strcpy(dnsdomname, lp_realm(gensec_security->lp_ctx), sizeof(dnsdomname) - 1);
 191                 strlower_m(dnsdomname);
 192
 193                 /* Find out the DNS host name */
 194                 safe_strcpy(dnsname, gensec_ntlmssp_state->server_name, sizeof(dnsname) - 1);
 195                 if (dnsdomname[0] != '\0') {
 196                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 197                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 198                 }
 199                 strlower_m(dnsname);
 200
 201                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 202                         target_name_dns = dnsdomname;
 203                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 204                         target_name_dns = dnsname;
 205                 }
 206
 207                 msrpc_gen(out_mem_ctx,
 208                           &struct_blob, "aaaaa",
 209                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 210                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
 211                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 212                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 213                           0, "");
 214         } else {
 215                 struct_blob = data_blob(NULL, 0);
 216         }
 217
 218         {
 219                 /* Marshal the packet in the right format, be it unicode or ASCII */
 220                 const char *gen_string;
 221                 if (gensec_ntlmssp_state->unicode) {
 222                         gen_string = "CdUdbddB";
 223                 } else {
 224                         gen_string = "CdAdbddB";
 225                 }
 226
 227                 msrpc_gen(out_mem_ctx,
 228                           out, gen_string,
 229                           "NTLMSSP",
 230                           NTLMSSP_CHALLENGE,
 231                           target_name,
 232                           chal_flags,
 233                           cryptkey, 8,
 234                           0, 0,
 235                           struct_blob.data, struct_blob.length);
 236         }
 237
 238         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 239
 240         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 241 }
 242
 243 /**
 244  * Next state function for the Authenticate packet
 245  *
 246  * @param gensec_ntlmssp_state NTLMSSP State
 247  * @param request The request, as a DATA_BLOB
 248  * @return Errors or NT_STATUS_OK.
 249  */
 250
 251 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 252                                        const DATA_BLOB request)
 253 {
 254         uint32_t ntlmssp_command, auth_flags;
 255         NTSTATUS nt_status;
 256
 257         uint8_t session_nonce_hash[16];
 258
 259         const char *parse_string;
 260         char *domain = NULL;
 261         char *user = NULL;
 262         char *workstation = NULL;
 263
 264 #if 0
 265         file_save("ntlmssp_auth.dat", request.data, request.length);
 266 #endif
 267
 268         if (gensec_ntlmssp_state->unicode) {
 269                 parse_string = "CdBBUUUBd";
 270         } else {
 271                 parse_string = "CdBBAAABd";
 272         }
 273
 274         /* zero these out */
 275         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 276         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 277         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 278
 279         gensec_ntlmssp_state->user = NULL;
 280         gensec_ntlmssp_state->domain = NULL;
 281         gensec_ntlmssp_state->workstation = NULL;
 282
 283         /* now the NTLMSSP encoded auth hashes */
 284         if (!msrpc_parse(gensec_ntlmssp_state,
 285                          lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
 286                          &request, parse_string,
 287                          "NTLMSSP",
 288                          &ntlmssp_command,
 289                          &gensec_ntlmssp_state->lm_resp,
 290                          &gensec_ntlmssp_state->nt_resp,
 291                          &domain,
 292                          &user,
 293                          &workstation,
 294                          &gensec_ntlmssp_state->encrypted_session_key,
 295                          &auth_flags)) {
 296                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 297                 dump_data(10, request.data, request.length);
 298
 299                 /* zero this out */
 300                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 301                 auth_flags = 0;
 302
 303                 /* Try again with a shorter string (Win9X truncates this packet) */
 304                 if (gensec_ntlmssp_state->unicode) {
 305                         parse_string = "CdBBUUU";
 306                 } else {
 307                         parse_string = "CdBBAAA";
 308                 }
 309
 310                 /* now the NTLMSSP encoded auth hashes */
 311                 if (!msrpc_parse(gensec_ntlmssp_state,
 312                                  lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
 313                                  &request, parse_string,
 314                                  "NTLMSSP",
 315                                  &ntlmssp_command,
 316                                  &gensec_ntlmssp_state->lm_resp,
 317                                  &gensec_ntlmssp_state->nt_resp,
 318                                  &domain,
 319                                  &user,
 320                                  &workstation)) {
 321                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 322                         dump_data(2, request.data, request.length);
 323
 324                         return NT_STATUS_INVALID_PARAMETER;
 325                 }
 326         }
 327
 328         if (auth_flags)
 329                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 330
 331         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 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_username(gensec_ntlmssp_state, user))) {
 338                 /* zero this out */
 339                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 340                 return nt_status;
 341         }
 342
 343         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 344                 /* zero this out */
 345                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 346                 return nt_status;
 347         }
 348
 349         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 350                  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));
 351
 352 #if 0
 353         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 354         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 355 #endif
 356
 357         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 358            client challenge
 359
 360            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 361         */
 362         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 363                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 364                         struct MD5Context md5_session_nonce_ctx;
 365                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 366                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 367
 368                         gensec_ntlmssp_state->doing_ntlm2 = true;
 369
 370                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 371                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 372
 373                         MD5Init(&md5_session_nonce_ctx);
 374                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 375                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 376
 377                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 378                                                                session_nonce_hash, 8);
 379
 380                         /* LM response is no longer useful, zero it out */
 381                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 382
 383                         /* We changed the effective challenge - set it */
 384                         if (!NT_STATUS_IS_OK(nt_status =
 385                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 386                                                                                  &gensec_ntlmssp_state->chal))) {
 387                                 /* zero this out */
 388                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 389                                 return nt_status;
 390                         }
 391
 392                         /* LM Key is incompatible... */
 393                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 394                 }
 395         }
 396         return NT_STATUS_OK;
 397 }
 398
 399 /**
 400  * Next state function for the Authenticate packet
 401  * (after authentication - figures out the session keys etc)
 402  *
 403  * @param gensec_ntlmssp_state NTLMSSP State
 404  * @return Errors or NT_STATUS_OK.
 405  */
 406
 407 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 408                                         DATA_BLOB *user_session_key,
 409                                         DATA_BLOB *lm_session_key)
 410 {
 411         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 412         NTSTATUS nt_status;
 413         DATA_BLOB session_key = data_blob(NULL, 0);
 414
 415         if (user_session_key)
 416                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 417
 418         if (lm_session_key)
 419                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 420
 421         /* Handle the different session key derivation for NTLM2 */
 422         if (gensec_ntlmssp_state->doing_ntlm2) {
 423                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 424                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 425                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 426                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 427                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 428                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 429
 430                 } else {
 431                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 432                         session_key = data_blob(NULL, 0);
 433                 }
 434         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 435                 /* Ensure we can never get here on NTLMv2 */
 436                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 437
 438                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 439                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 440                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 441                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 442                                                           session_key.data);
 443                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 444                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 445                         } else {
 446
 447                                 /* When there is no LM response, just use zeros */
 448                                 static const uint8_t zeros[24];
 449                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 450                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 451                                                           session_key.data);
 452                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 453                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 454                         }
 455                 } else {
 456                         /* LM Key not selected */
 457                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 458
 459                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 460                         session_key = data_blob(NULL, 0);
 461                 }
 462
 463         } else if (user_session_key && user_session_key->data) {
 464                 session_key = *user_session_key;
 465                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 466                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 467
 468                 /* LM Key not selected */
 469                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 470
 471         } else if (lm_session_key && lm_session_key->data) {
 472                 /* Very weird to have LM key, but no user session key, but anyway.. */
 473                 session_key = *lm_session_key;
 474                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 475                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 476
 477                 /* LM Key not selected */
 478                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 479
 480         } else {
 481                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 482                 session_key = data_blob(NULL, 0);
 483
 484                 /* LM Key not selected */
 485                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 486         }
 487
 488         /* With KEY_EXCH, the client supplies the proposed session key,
 489            but encrypts it with the long-term key */
 490         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 491                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 492                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 493                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 494                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 495                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
 496                         return NT_STATUS_INVALID_PARAMETER;
 497                 } else if (!session_key.data || session_key.length != 16) {
 498                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 499                                   (unsigned)session_key.length));
 500                         gensec_ntlmssp_state->session_key = session_key;
 501                 } else {
 502                         dump_data_pw("KEY_EXCH session key (enc):\n",
 503                                      gensec_ntlmssp_state->encrypted_session_key.data,
 504                                      gensec_ntlmssp_state->encrypted_session_key.length);
 505                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 506                                       session_key.data,
 507                                       gensec_ntlmssp_state->encrypted_session_key.length);
 508                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 509                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 510                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 511                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 512                                      gensec_ntlmssp_state->encrypted_session_key.length);
 513                 }
 514         } else {
 515                 gensec_ntlmssp_state->session_key = session_key;
 516         }
 517
 518         /* keep the session key around on the new context */
 519         talloc_steal(gensec_ntlmssp_state, session_key.data);
 520
 521         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 522             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 523                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 524         } else {
 525                 nt_status = NT_STATUS_OK;
 526         }
 527
 528         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 529
 530         /* allow arbitarily many authentications, but watch that this will cause a
 531            memory leak, until the gensec_ntlmssp_state is shutdown
 532         */
 533
 534         if (gensec_ntlmssp_state->server_multiple_authentications) {
 535                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 536         } else {
 537                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 538         }
 539
 540         return nt_status;
 541 }
 542
 543
 544 /**
 545  * Next state function for the Authenticate packet
 546  *
 547  * @param gensec_security GENSEC state
 548  * @param out_mem_ctx Memory context for *out
 549  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 550  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 551  * @return Errors or NT_STATUS_OK if authentication sucessful
 552  */
 553
 554 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 555                              TALLOC_CTX *out_mem_ctx,
 556                              const DATA_BLOB in, DATA_BLOB *out)
 557 {
 558         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 559         DATA_BLOB user_session_key = data_blob(NULL, 0);
 560         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 561         NTSTATUS nt_status;
 562
 563         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
 564         if (!mem_ctx) {
 565                 return NT_STATUS_NO_MEMORY;
 566         }
 567
 568         /* zero the outbound NTLMSSP packet */
 569         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 570
 571         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 572                 talloc_free(mem_ctx);
 573                 return nt_status;
 574         }
 575
 576         /*
 577          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 578          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 579          * smb.conf file) and no NTLMv2 response was sent then the password check
 580          * will fail here. JRA.
 581          */
 582
 583         /* Finally, actually ask if the password is OK */
 584
 585         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
 586                                                                               &user_session_key, &lm_session_key))) {
 587                 talloc_free(mem_ctx);
 588                 return nt_status;
 589         }
 590
 591         if (gensec_security->want_features
 592             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
 593                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 594                 talloc_free(mem_ctx);
 595                 return nt_status;
 596         } else {
 597                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 598                 talloc_free(mem_ctx);
 599                 return NT_STATUS_OK;
 600         }
 601 }
 602
 603 /**
 604  * Return the challenge as determined by the authentication subsystem
 605  * @return an 8 byte random challenge
 606  */
 607
 608 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 609 {
 610         NTSTATUS status;
 611         const uint8_t *chal;
 612
 613         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 614         if (!NT_STATUS_IS_OK(status)) {
 615                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 616                         nt_errstr(status)));
 617                 return NULL;
 618         }
 619
 620         return chal;
 621 }
 622
 623 /**
 624  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 625  *
 626  * @return If the effective challenge used by the auth subsystem may be modified
 627  */
 628 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 629 {
 630         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 631 }
 632
 633 /**
 634  * NTLM2 authentication modifies the effective challenge,
 635  * @param challenge The new challenge value
 636  */
 637 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 638 {
 639         NTSTATUS nt_status;
 640         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 641         const uint8_t *chal;
 642
 643         if (challenge->length != 8) {
 644                 return NT_STATUS_INVALID_PARAMETER;
 645         }
 646
 647         chal = challenge->data;
 648
 649         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 650
 651         return nt_status;
 652 }
 653
 654 /**
 655  * Check the password on an NTLMSSP login.
 656  *
 657  * Return the session keys used on the connection.
 658  */
 659
 660 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 661                                             TALLOC_CTX *mem_ctx,
 662                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 663 {
 664         NTSTATUS nt_status;
 665         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
 666         if (!user_info) {
 667                 return NT_STATUS_NO_MEMORY;
 668         }
 669
 670         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 671         user_info->flags = 0;
 672         user_info->mapped_state = false;
 673         user_info->client.account_name = gensec_ntlmssp_state->user;
 674         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 675         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 676         user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
 677
 678         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 679         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 680         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 681         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 682         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 683
 684         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx,
 685                                         user_info, &gensec_ntlmssp_state->server_info);
 686         talloc_free(user_info);
 687         NT_STATUS_NOT_OK_RETURN(nt_status);
 688
 689         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
 690
 691         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 692                 DEBUG(10, ("Got NT session key of length %u\n",
 693                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 694                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
 695                         return NT_STATUS_NO_MEMORY;
 696                 }
 697
 698                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
 699         }
 700         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 701                 DEBUG(10, ("Got LM session key of length %u\n",
 702                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 703                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
 704                         return NT_STATUS_NO_MEMORY;
 705                 }
 706
 707                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
 708         }
 709         return nt_status;
 710 }
 711
 712 /**
 713  * Return the credentials of a logged on user, including session keys
 714  * etc.
 715  *
 716  * Only valid after a successful authentication
 717  *
 718  * May only be called once per authentication.
 719  *
 720  */
 721
 722 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 723                                      struct auth_session_info **session_info)
 724 {
 725         NTSTATUS nt_status;
 726         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 727
 728         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->lp_ctx, gensec_ntlmssp_state->server_info, session_info);
 729         NT_STATUS_NOT_OK_RETURN(nt_status);
 730
 731         (*session_info)->session_key = data_blob_talloc(*session_info,
 732                                                         gensec_ntlmssp_state->session_key.data,
 733                                                         gensec_ntlmssp_state->session_key.length);
 734
 735         return NT_STATUS_OK;
 736 }
 737
 738 /**
 739  * Start NTLMSSP on the server side
 740  *
 741  */
 742 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 743 {
 744         NTSTATUS nt_status;
 745         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 746
 747         nt_status = gensec_ntlmssp_start(gensec_security);
 748         NT_STATUS_NOT_OK_RETURN(nt_status);
 749
 750         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 751
 752         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 753
 754         gensec_ntlmssp_state->workstation = NULL;
 755         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->lp_ctx);
 756
 757         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->lp_ctx);
 758
 759         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 760
 761         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->lp_ctx)
 762                                           && lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "allow_lm_key", false));
 763
 764         gensec_ntlmssp_state->server_multiple_authentications = false;
 765
 766         gensec_ntlmssp_state->neg_flags =
 767                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
 768
 769         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 770         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 771         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 772
 773         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "128bit", true)) {
 774                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 775         }
 776
 777         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "56bit", true)) {
 778                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 779         }
 780
 781         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "keyexchange", true)) {
 782                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 783         }
 784
 785         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "alwayssign", true)) {
 786                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 787         }
 788
 789         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "ntlm2", true)) {
 790                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 791         }
 792
 793         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 794                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 795         }
 796         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 797                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 798         }
 799
 800         nt_status = auth_context_create(gensec_ntlmssp_state,
 801                                         gensec_security->event_ctx,
 802                                         gensec_security->msg_ctx,
 803                                         gensec_security->lp_ctx,
 804                                         &gensec_ntlmssp_state->auth_context);
 805         NT_STATUS_NOT_OK_RETURN(nt_status);
 806
 807         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 808         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 809         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 810         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 811         gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->lp_ctx);
 812
 813         return NT_STATUS_OK;
 814 }
 815