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                                                          &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         if (!cryptkey) {
 157                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
 158                 return NT_STATUS_INTERNAL_ERROR;
 159         }
 160
 161         /* Check if we may set the challenge */
 162         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 163                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 164         }
 165
 166         /* The flags we send back are not just the negotiated flags,
 167          * they are also 'what is in this packet'.  Therfore, we
 168          * operate on 'chal_flags' from here on
 169          */
 170
 171         chal_flags = gensec_ntlmssp_state->neg_flags;
 172
 173         /* get the right name to fill in as 'target' */
 174         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 175                                           neg_flags, &chal_flags);
 176         if (target_name == NULL)
 177                 return NT_STATUS_INVALID_PARAMETER;
 178
 179         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 180         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 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                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 185                 const char *target_name_dns = "";
 186
 187                 /* Find out the DNS domain name */
 188                 dnsdomname[0] = '\0';
 189                 safe_strcpy(dnsdomname, lp_realm(gensec_security->lp_ctx), sizeof(dnsdomname) - 1);
 190                 strlower_m(dnsdomname);
 191
 192                 /* Find out the DNS host name */
 193                 safe_strcpy(dnsname, gensec_ntlmssp_state->server_name, sizeof(dnsname) - 1);
 194                 if (dnsdomname[0] != '\0') {
 195                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 196                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 197                 }
 198                 strlower_m(dnsname);
 199
 200                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 201                         target_name_dns = dnsdomname;
 202                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 203                         target_name_dns = dnsname;
 204                 }
 205
 206                 msrpc_gen(out_mem_ctx,
 207                           &struct_blob, "aaaaa",
 208                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 209                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
 210                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 211                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 212                           0, "");
 213         } else {
 214                 struct_blob = data_blob(NULL, 0);
 215         }
 216
 217         {
 218                 /* Marshal the packet in the right format, be it unicode or ASCII */
 219                 const char *gen_string;
 220                 if (gensec_ntlmssp_state->unicode) {
 221                         gen_string = "CdUdbddB";
 222                 } else {
 223                         gen_string = "CdAdbddB";
 224                 }
 225
 226                 msrpc_gen(out_mem_ctx,
 227                           out, gen_string,
 228                           "NTLMSSP",
 229                           NTLMSSP_CHALLENGE,
 230                           target_name,
 231                           chal_flags,
 232                           cryptkey, 8,
 233                           0, 0,
 234                           struct_blob.data, struct_blob.length);
 235         }
 236
 237         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 238
 239         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 240 }
 241
 242 /**
 243  * Next state function for the Authenticate packet
 244  *
 245  * @param gensec_ntlmssp_state NTLMSSP State
 246  * @param request The request, as a DATA_BLOB
 247  * @return Errors or NT_STATUS_OK.
 248  */
 249
 250 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 251                                        const DATA_BLOB request)
 252 {
 253         uint32_t ntlmssp_command, auth_flags;
 254         NTSTATUS nt_status;
 255
 256         uint8_t session_nonce_hash[16];
 257
 258         const char *parse_string;
 259         char *domain = NULL;
 260         char *user = NULL;
 261         char *workstation = NULL;
 262
 263 #if 0
 264         file_save("ntlmssp_auth.dat", request.data, request.length);
 265 #endif
 266
 267         if (gensec_ntlmssp_state->unicode) {
 268                 parse_string = "CdBBUUUBd";
 269         } else {
 270                 parse_string = "CdBBAAABd";
 271         }
 272
 273         /* zero these out */
 274         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 275         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 276         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 277
 278         gensec_ntlmssp_state->user = NULL;
 279         gensec_ntlmssp_state->domain = NULL;
 280         gensec_ntlmssp_state->workstation = NULL;
 281
 282         /* now the NTLMSSP encoded auth hashes */
 283         if (!msrpc_parse(gensec_ntlmssp_state,
 284                          &request, parse_string,
 285                          "NTLMSSP",
 286                          &ntlmssp_command,
 287                          &gensec_ntlmssp_state->lm_resp,
 288                          &gensec_ntlmssp_state->nt_resp,
 289                          &domain,
 290                          &user,
 291                          &workstation,
 292                          &gensec_ntlmssp_state->encrypted_session_key,
 293                          &auth_flags)) {
 294                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 295                 dump_data(10, request.data, request.length);
 296
 297                 /* zero this out */
 298                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 299                 auth_flags = 0;
 300
 301                 /* Try again with a shorter string (Win9X truncates this packet) */
 302                 if (gensec_ntlmssp_state->unicode) {
 303                         parse_string = "CdBBUUU";
 304                 } else {
 305                         parse_string = "CdBBAAA";
 306                 }
 307
 308                 /* now the NTLMSSP encoded auth hashes */
 309                 if (!msrpc_parse(gensec_ntlmssp_state,
 310                                  &request, parse_string,
 311                                  "NTLMSSP",
 312                                  &ntlmssp_command,
 313                                  &gensec_ntlmssp_state->lm_resp,
 314                                  &gensec_ntlmssp_state->nt_resp,
 315                                  &domain,
 316                                  &user,
 317                                  &workstation)) {
 318                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 319                         dump_data(2, request.data, request.length);
 320
 321                         return NT_STATUS_INVALID_PARAMETER;
 322                 }
 323         }
 324
 325         if (auth_flags)
 326                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 327
 328         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 329                 /* zero this out */
 330                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 331                 return nt_status;
 332         }
 333
 334         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 335                 /* zero this out */
 336                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 337                 return nt_status;
 338         }
 339
 340         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 341                 /* zero this out */
 342                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 343                 return nt_status;
 344         }
 345
 346         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 347                  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));
 348
 349 #if 0
 350         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 351         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 352 #endif
 353
 354         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 355            client challenge
 356
 357            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 358         */
 359         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 360                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 361                         struct MD5Context md5_session_nonce_ctx;
 362                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 363                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 364
 365                         gensec_ntlmssp_state->doing_ntlm2 = true;
 366
 367                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 368                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 369
 370                         MD5Init(&md5_session_nonce_ctx);
 371                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 372                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 373
 374                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 375                                                                session_nonce_hash, 8);
 376
 377                         /* LM response is no longer useful, zero it out */
 378                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 379
 380                         /* We changed the effective challenge - set it */
 381                         if (!NT_STATUS_IS_OK(nt_status =
 382                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 383                                                                                  &gensec_ntlmssp_state->chal))) {
 384                                 /* zero this out */
 385                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 386                                 return nt_status;
 387                         }
 388
 389                         /* LM Key is incompatible... */
 390                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 391                 }
 392         }
 393         return NT_STATUS_OK;
 394 }
 395
 396 /**
 397  * Next state function for the Authenticate packet
 398  * (after authentication - figures out the session keys etc)
 399  *
 400  * @param gensec_ntlmssp_state NTLMSSP State
 401  * @return Errors or NT_STATUS_OK.
 402  */
 403
 404 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 405                                         DATA_BLOB *user_session_key,
 406                                         DATA_BLOB *lm_session_key)
 407 {
 408         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 409         NTSTATUS nt_status;
 410         DATA_BLOB session_key = data_blob(NULL, 0);
 411
 412         if (user_session_key)
 413                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 414
 415         if (lm_session_key)
 416                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 417
 418         /* Handle the different session key derivation for NTLM2 */
 419         if (gensec_ntlmssp_state->doing_ntlm2) {
 420                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 421                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 422                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 423                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 424                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 425                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 426
 427                 } else {
 428                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 429                         session_key = data_blob(NULL, 0);
 430                 }
 431         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 432                 /* Ensure we can never get here on NTLMv2 */
 433                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 434
 435                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 436                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 437                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 438                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 439                                                           session_key.data);
 440                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 441                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 442                         } else {
 443
 444                                 /* When there is no LM response, just use zeros */
 445                                 static const uint8_t zeros[24];
 446                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 447                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 448                                                           session_key.data);
 449                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 450                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 451                         }
 452                 } else {
 453                         /* LM Key not selected */
 454                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 455
 456                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 457                         session_key = data_blob(NULL, 0);
 458                 }
 459
 460         } else if (user_session_key && user_session_key->data) {
 461                 session_key = *user_session_key;
 462                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 463                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 464
 465                 /* LM Key not selected */
 466                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 467
 468         } else if (lm_session_key && lm_session_key->data) {
 469                 /* Very weird to have LM key, but no user session key, but anyway.. */
 470                 session_key = *lm_session_key;
 471                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 472                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 473
 474                 /* LM Key not selected */
 475                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 476
 477         } else {
 478                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 479                 session_key = data_blob(NULL, 0);
 480
 481                 /* LM Key not selected */
 482                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 483         }
 484
 485         /* With KEY_EXCH, the client supplies the proposed session key,
 486            but encrypts it with the long-term key */
 487         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 488                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 489                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 490                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 491                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 492                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
 493                         return NT_STATUS_INVALID_PARAMETER;
 494                 } else if (!session_key.data || session_key.length != 16) {
 495                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 496                                   (unsigned)session_key.length));
 497                         gensec_ntlmssp_state->session_key = session_key;
 498                 } else {
 499                         dump_data_pw("KEY_EXCH session key (enc):\n",
 500                                      gensec_ntlmssp_state->encrypted_session_key.data,
 501                                      gensec_ntlmssp_state->encrypted_session_key.length);
 502                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 503                                       session_key.data,
 504                                       gensec_ntlmssp_state->encrypted_session_key.length);
 505                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 506                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 507                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 508                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 509                                      gensec_ntlmssp_state->encrypted_session_key.length);
 510                 }
 511         } else {
 512                 gensec_ntlmssp_state->session_key = session_key;
 513         }
 514
 515         /* keep the session key around on the new context */
 516         talloc_steal(gensec_ntlmssp_state, session_key.data);
 517
 518         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 519             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 520                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 521         } else {
 522                 nt_status = NT_STATUS_OK;
 523         }
 524
 525         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 526
 527         /* allow arbitarily many authentications, but watch that this will cause a
 528            memory leak, until the gensec_ntlmssp_state is shutdown
 529         */
 530
 531         if (gensec_ntlmssp_state->server_multiple_authentications) {
 532                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 533         } else {
 534                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 535         }
 536
 537         return nt_status;
 538 }
 539
 540
 541 /**
 542  * Next state function for the Authenticate packet
 543  *
 544  * @param gensec_security GENSEC state
 545  * @param out_mem_ctx Memory context for *out
 546  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 547  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 548  * @return Errors or NT_STATUS_OK if authentication sucessful
 549  */
 550
 551 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 552                              TALLOC_CTX *out_mem_ctx,
 553                              const DATA_BLOB in, DATA_BLOB *out)
 554 {
 555         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 556         DATA_BLOB user_session_key = data_blob(NULL, 0);
 557         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 558         NTSTATUS nt_status;
 559
 560         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
 561         if (!mem_ctx) {
 562                 return NT_STATUS_NO_MEMORY;
 563         }
 564
 565         /* zero the outbound NTLMSSP packet */
 566         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 567
 568         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 569                 talloc_free(mem_ctx);
 570                 return nt_status;
 571         }
 572
 573         /*
 574          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 575          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 576          * smb.conf file) and no NTLMv2 response was sent then the password check
 577          * will fail here. JRA.
 578          */
 579
 580         /* Finally, actually ask if the password is OK */
 581
 582         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
 583                                                                               &user_session_key, &lm_session_key))) {
 584                 talloc_free(mem_ctx);
 585                 return nt_status;
 586         }
 587
 588         if (gensec_security->want_features
 589             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
 590                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 591                 talloc_free(mem_ctx);
 592                 return nt_status;
 593         } else {
 594                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 595                 talloc_free(mem_ctx);
 596                 return NT_STATUS_OK;
 597         }
 598 }
 599
 600 /**
 601  * Return the challenge as determined by the authentication subsystem
 602  * @return an 8 byte random challenge
 603  */
 604
 605 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 606 {
 607         NTSTATUS status;
 608         const uint8_t *chal;
 609
 610         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 611         if (!NT_STATUS_IS_OK(status)) {
 612                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 613                         nt_errstr(status)));
 614                 return NULL;
 615         }
 616
 617         return chal;
 618 }
 619
 620 /**
 621  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 622  *
 623  * @return If the effective challenge used by the auth subsystem may be modified
 624  */
 625 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 626 {
 627         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 628 }
 629
 630 /**
 631  * NTLM2 authentication modifies the effective challenge,
 632  * @param challenge The new challenge value
 633  */
 634 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 635 {
 636         NTSTATUS nt_status;
 637         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 638         const uint8_t *chal;
 639
 640         if (challenge->length != 8) {
 641                 return NT_STATUS_INVALID_PARAMETER;
 642         }
 643
 644         chal = challenge->data;
 645
 646         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 647
 648         return nt_status;
 649 }
 650
 651 /**
 652  * Check the password on an NTLMSSP login.
 653  *
 654  * Return the session keys used on the connection.
 655  */
 656
 657 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 658                                             TALLOC_CTX *mem_ctx,
 659                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 660 {
 661         NTSTATUS nt_status;
 662         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
 663         if (!user_info) {
 664                 return NT_STATUS_NO_MEMORY;
 665         }
 666
 667         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 668         user_info->flags = 0;
 669         user_info->mapped_state = false;
 670         user_info->client.account_name = gensec_ntlmssp_state->user;
 671         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 672         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 673         user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
 674
 675         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 676         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 677         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 678         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 679         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 680
 681         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx,
 682                                         user_info, &gensec_ntlmssp_state->server_info);
 683         talloc_free(user_info);
 684         NT_STATUS_NOT_OK_RETURN(nt_status);
 685
 686         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
 687
 688         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 689                 DEBUG(10, ("Got NT session key of length %u\n",
 690                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 691                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
 692                         return NT_STATUS_NO_MEMORY;
 693                 }
 694
 695                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
 696         }
 697         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 698                 DEBUG(10, ("Got LM session key of length %u\n",
 699                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 700                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
 701                         return NT_STATUS_NO_MEMORY;
 702                 }
 703
 704                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
 705         }
 706         return nt_status;
 707 }
 708
 709 /**
 710  * Return the credentials of a logged on user, including session keys
 711  * etc.
 712  *
 713  * Only valid after a successful authentication
 714  *
 715  * May only be called once per authentication.
 716  *
 717  */
 718
 719 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 720                                      struct auth_session_info **session_info)
 721 {
 722         NTSTATUS nt_status;
 723         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 724
 725         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->lp_ctx, gensec_ntlmssp_state->server_info, session_info);
 726         NT_STATUS_NOT_OK_RETURN(nt_status);
 727
 728         (*session_info)->session_key = data_blob_talloc(*session_info,
 729                                                         gensec_ntlmssp_state->session_key.data,
 730                                                         gensec_ntlmssp_state->session_key.length);
 731
 732         return NT_STATUS_OK;
 733 }
 734
 735 /**
 736  * Start NTLMSSP on the server side
 737  *
 738  */
 739 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 740 {
 741         NTSTATUS nt_status;
 742         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 743
 744         nt_status = gensec_ntlmssp_start(gensec_security);
 745         NT_STATUS_NOT_OK_RETURN(nt_status);
 746
 747         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 748
 749         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 750
 751         gensec_ntlmssp_state->workstation = NULL;
 752         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->lp_ctx);
 753
 754         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->lp_ctx);
 755
 756         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 757
 758         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->lp_ctx)
 759                                           && lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "allow_lm_key", false));
 760
 761         gensec_ntlmssp_state->server_multiple_authentications = false;
 762
 763         gensec_ntlmssp_state->neg_flags =
 764                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
 765
 766         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 767         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 768         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 769
 770         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "128bit", true)) {
 771                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 772         }
 773
 774         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "56bit", true)) {
 775                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 776         }
 777
 778         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "keyexchange", true)) {
 779                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 780         }
 781
 782         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "alwayssign", true)) {
 783                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 784         }
 785
 786         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "ntlm2", true)) {
 787                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 788         }
 789
 790         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 791                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 792         }
 793         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 794                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 795         }
 796
 797         nt_status = auth_context_create(gensec_ntlmssp_state,
 798                                         gensec_security->event_ctx,
 799                                         gensec_security->msg_ctx,
 800                                         gensec_security->lp_ctx,
 801                                         &gensec_ntlmssp_state->auth_context);
 802         NT_STATUS_NOT_OK_RETURN(nt_status);
 803
 804         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 805         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 806         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 807         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 808         gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->lp_ctx);
 809
 810         return NT_STATUS_OK;
 811 }
 812