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 "system/network.h"
  26 #include "lib/tsocket/tsocket.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "../libcli/auth/libcli_auth.h"
  29 #include "../lib/crypto/crypto.h"
  30 #include "auth/gensec/gensec.h"
  31 #include "auth/auth.h"
  32 #include "param/param.h"
  33
  34 /**
  35  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  36  *
  37  */
  38
  39 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user)
  40 {
  41         if (!user) {
  42                 /* it should be at least "" */
  43                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  44                 return NT_STATUS_INVALID_PARAMETER;
  45         }
  46         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
  47         if (!gensec_ntlmssp_state->user) {
  48                 return NT_STATUS_NO_MEMORY;
  49         }
  50         return NT_STATUS_OK;
  51 }
  52
  53 /**
  54  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  55  *
  56  */
  57 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain)
  58 {
  59         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
  60         if (!gensec_ntlmssp_state->domain) {
  61                 return NT_STATUS_NO_MEMORY;
  62         }
  63         return NT_STATUS_OK;
  64 }
  65
  66 /**
  67  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  68  *
  69  */
  70 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation)
  71 {
  72         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
  73         if (!gensec_ntlmssp_state->workstation) {
  74                 return NT_STATUS_NO_MEMORY;
  75         }
  76         return NT_STATUS_OK;
  77 }
  78
  79 /**
  80  * Determine correct target name flags for reply, given server role
  81  * and negotiated flags
  82  *
  83  * @param gensec_ntlmssp_state NTLMSSP State
  84  * @param neg_flags The flags from the packet
  85  * @param chal_flags The flags to be set in the reply packet
  86  * @return The 'target name' string.
  87  */
  88
  89 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  90                                        uint32_t neg_flags, uint32_t *chal_flags)
  91 {
  92         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  93                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
  94                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  95                 if (gensec_ntlmssp_state->server.is_standalone) {
  96                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  97                         return gensec_ntlmssp_state->server_name;
  98                 } else {
  99                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 100                         return gensec_ntlmssp_state->domain;
 101                 };
 102         } else {
 103                 return "";
 104         }
 105 }
 106
 107
 108
 109 /**
 110  * Next state function for the Negotiate packet
 111  *
 112  * @param gensec_security GENSEC state
 113  * @param out_mem_ctx Memory context for *out
 114  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 115  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 116  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 117  */
 118
 119 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 120                                   TALLOC_CTX *out_mem_ctx,
 121                                   const DATA_BLOB in, DATA_BLOB *out)
 122 {
 123         struct gensec_ntlmssp_context *gensec_ntlmssp =
 124                 talloc_get_type_abort(gensec_security->private_data,
 125                                       struct gensec_ntlmssp_context);
 126         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 127         DATA_BLOB struct_blob;
 128         uint32_t neg_flags = 0;
 129         uint32_t ntlmssp_command, chal_flags;
 130         uint8_t cryptkey[8];
 131         const char *target_name;
 132         NTSTATUS status;
 133
 134         /* parse the NTLMSSP packet */
 135 #if 0
 136         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 137 #endif
 138
 139         if (in.length) {
 140                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx,
 141                                                          &in, "Cdd",
 142                                                          "NTLMSSP",
 143                                                          &ntlmssp_command,
 144                                                          &neg_flags)) {
 145                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 146                                 "NTLMSSP Negotiate of length %u:\n",
 147                                 (unsigned int)in.length ));
 148                         dump_data(2, in.data, in.length);
 149                         return NT_STATUS_INVALID_PARAMETER;
 150                 }
 151                 debug_ntlmssp_flags(neg_flags);
 152         }
 153
 154         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 155
 156         /* Ask our caller what challenge they would like in the packet */
 157         status = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state, cryptkey);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge: %s\n",
 160                           nt_errstr(status)));
 161                 return status;
 162         }
 163
 164         /* Check if we may set the challenge */
 165         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 166                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 167         }
 168
 169         /* The flags we send back are not just the negotiated flags,
 170          * they are also 'what is in this packet'.  Therfore, we
 171          * operate on 'chal_flags' from here on
 172          */
 173
 174         chal_flags = gensec_ntlmssp_state->neg_flags;
 175
 176         /* get the right name to fill in as 'target' */
 177         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 178                                           neg_flags, &chal_flags);
 179         if (target_name == NULL)
 180                 return NT_STATUS_INVALID_PARAMETER;
 181
 182         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 183         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 184
 185         /* This creates the 'blob' of names that appears at the end of the packet */
 186         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 187                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 188
 189                 /* Find out the DNS domain name */
 190                 dnsdomname[0] = '\0';
 191                 safe_strcpy(dnsdomname, lp_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
 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                 msrpc_gen(out_mem_ctx,
 202                           &struct_blob, "aaaaa",
 203                           MsvAvNbDomainName, target_name,
 204                           MsvAvNbComputerName, gensec_ntlmssp_state->server_name,
 205                           MsvAvDnsDomainName, dnsdomname,
 206                           MsvAvDnsComputerName, dnsname,
 207                           MsvAvEOL, "");
 208         } else {
 209                 struct_blob = data_blob(NULL, 0);
 210         }
 211
 212         {
 213                 /* Marshal the packet in the right format, be it unicode or ASCII */
 214                 const char *gen_string;
 215                 if (gensec_ntlmssp_state->unicode) {
 216                         gen_string = "CdUdbddB";
 217                 } else {
 218                         gen_string = "CdAdbddB";
 219                 }
 220
 221                 msrpc_gen(out_mem_ctx,
 222                           out, gen_string,
 223                           "NTLMSSP",
 224                           NTLMSSP_CHALLENGE,
 225                           target_name,
 226                           chal_flags,
 227                           cryptkey, 8,
 228                           0, 0,
 229                           struct_blob.data, struct_blob.length);
 230         }
 231
 232         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 233
 234         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 235 }
 236
 237 /**
 238  * Next state function for the Authenticate packet
 239  *
 240  * @param gensec_ntlmssp_state NTLMSSP State
 241  * @param request The request, as a DATA_BLOB
 242  * @return Errors or NT_STATUS_OK.
 243  */
 244
 245 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 246                                        const DATA_BLOB request)
 247 {
 248         uint32_t ntlmssp_command, auth_flags;
 249         NTSTATUS nt_status;
 250
 251         uint8_t session_nonce_hash[16];
 252
 253         const char *parse_string;
 254         char *domain = NULL;
 255         char *user = NULL;
 256         char *workstation = NULL;
 257
 258 #if 0
 259         file_save("ntlmssp_auth.dat", request.data, request.length);
 260 #endif
 261
 262         if (gensec_ntlmssp_state->unicode) {
 263                 parse_string = "CdBBUUUBd";
 264         } else {
 265                 parse_string = "CdBBAAABd";
 266         }
 267
 268         /* zero these out */
 269         data_blob_free(&gensec_ntlmssp_state->session_key);
 270         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 271         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 272         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 273
 274         gensec_ntlmssp_state->user = NULL;
 275         gensec_ntlmssp_state->domain = NULL;
 276         gensec_ntlmssp_state->workstation = NULL;
 277
 278         /* now the NTLMSSP encoded auth hashes */
 279         if (!msrpc_parse(gensec_ntlmssp_state,
 280                          &request, parse_string,
 281                          "NTLMSSP",
 282                          &ntlmssp_command,
 283                          &gensec_ntlmssp_state->lm_resp,
 284                          &gensec_ntlmssp_state->nt_resp,
 285                          &domain,
 286                          &user,
 287                          &workstation,
 288                          &gensec_ntlmssp_state->encrypted_session_key,
 289                          &auth_flags)) {
 290                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 291                 dump_data(10, request.data, request.length);
 292
 293                 /* zero this out */
 294                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 295                 auth_flags = 0;
 296
 297                 /* Try again with a shorter string (Win9X truncates this packet) */
 298                 if (gensec_ntlmssp_state->unicode) {
 299                         parse_string = "CdBBUUU";
 300                 } else {
 301                         parse_string = "CdBBAAA";
 302                 }
 303
 304                 /* now the NTLMSSP encoded auth hashes */
 305                 if (!msrpc_parse(gensec_ntlmssp_state,
 306                                  &request, parse_string,
 307                                  "NTLMSSP",
 308                                  &ntlmssp_command,
 309                                  &gensec_ntlmssp_state->lm_resp,
 310                                  &gensec_ntlmssp_state->nt_resp,
 311                                  &domain,
 312                                  &user,
 313                                  &workstation)) {
 314                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 315                         dump_data(2, request.data, request.length);
 316
 317                         return NT_STATUS_INVALID_PARAMETER;
 318                 }
 319         }
 320
 321         if (auth_flags)
 322                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 323
 324         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 325                 /* zero this out */
 326                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 327                 return nt_status;
 328         }
 329
 330         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 331                 /* zero this out */
 332                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 333                 return nt_status;
 334         }
 335
 336         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 337                 /* zero this out */
 338                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 339                 return nt_status;
 340         }
 341
 342         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 343                  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));
 344
 345 #if 0
 346         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 347         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 348 #endif
 349
 350         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 351            client challenge
 352
 353            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 354         */
 355         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 356                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 357                         struct MD5Context md5_session_nonce_ctx;
 358                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 359                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 360
 361                         gensec_ntlmssp_state->doing_ntlm2 = true;
 362
 363                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 364                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 365
 366                         MD5Init(&md5_session_nonce_ctx);
 367                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 368                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 369
 370                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 371                                                                session_nonce_hash, 8);
 372
 373                         /* LM response is no longer useful, zero it out */
 374                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 375
 376                         /* We changed the effective challenge - set it */
 377                         if (!NT_STATUS_IS_OK(nt_status =
 378                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 379                                                                                  &gensec_ntlmssp_state->chal))) {
 380                                 /* zero this out */
 381                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 382                                 return nt_status;
 383                         }
 384
 385                         /* LM Key is incompatible... */
 386                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 387                 }
 388         }
 389         return NT_STATUS_OK;
 390 }
 391
 392 /**
 393  * Next state function for the Authenticate packet
 394  * (after authentication - figures out the session keys etc)
 395  *
 396  * @param gensec_ntlmssp_state NTLMSSP State
 397  * @return Errors or NT_STATUS_OK.
 398  */
 399
 400 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 401                                         DATA_BLOB *user_session_key,
 402                                         DATA_BLOB *lm_session_key)
 403 {
 404         struct gensec_ntlmssp_context *gensec_ntlmssp =
 405                 talloc_get_type_abort(gensec_security->private_data,
 406                                       struct gensec_ntlmssp_context);
 407         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 408         NTSTATUS nt_status;
 409         DATA_BLOB session_key = data_blob(NULL, 0);
 410
 411         if (!(gensec_security->want_features
 412               & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY))) {
 413                 return NT_STATUS_OK;
 414         }
 415
 416         if (user_session_key)
 417                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 418
 419         if (lm_session_key)
 420                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 421
 422         /* Handle the different session key derivation for NTLM2 */
 423         if (gensec_ntlmssp_state->doing_ntlm2) {
 424                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 425                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 426                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 427                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 428                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 429                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 430
 431                 } else {
 432                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 433                         session_key = data_blob(NULL, 0);
 434                 }
 435         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 436                 /* Ensure we can never get here on NTLMv2 */
 437                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 438
 439                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 440                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 441                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 442                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 443                                                           session_key.data);
 444                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 445                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 446                         } else {
 447
 448                                 /* When there is no LM response, just use zeros */
 449                                 static const uint8_t zeros[24];
 450                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 451                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 452                                                           session_key.data);
 453                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 454                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 455                         }
 456                 } else {
 457                         /* LM Key not selected */
 458                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 459
 460                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 461                         session_key = data_blob(NULL, 0);
 462                 }
 463
 464         } else if (user_session_key && user_session_key->data) {
 465                 session_key = data_blob_talloc(gensec_ntlmssp_state, user_session_key->data, user_session_key->length);
 466                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 467                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 468
 469                 /* LM Key not selected */
 470                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 471
 472         } else if (lm_session_key && lm_session_key->data) {
 473                 /* Very weird to have LM key, but no user session key, but anyway.. */
 474                 session_key = data_blob_talloc(gensec_ntlmssp_state, lm_session_key->data, lm_session_key->length);
 475                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 476                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 477
 478                 /* LM Key not selected */
 479                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 480
 481         } else {
 482                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 483                 session_key = data_blob(NULL, 0);
 484
 485                 /* LM Key not selected */
 486                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 487         }
 488
 489         /* With KEY_EXCH, the client supplies the proposed session key,
 490            but encrypts it with the long-term key */
 491         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 492                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 493                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 494                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 495                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 496                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
 497                         return NT_STATUS_INVALID_PARAMETER;
 498                 } else if (!session_key.data || session_key.length != 16) {
 499                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 500                                   (unsigned)session_key.length));
 501                         gensec_ntlmssp_state->session_key = session_key;
 502                 } else {
 503                         dump_data_pw("KEY_EXCH session key (enc):\n",
 504                                      gensec_ntlmssp_state->encrypted_session_key.data,
 505                                      gensec_ntlmssp_state->encrypted_session_key.length);
 506                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 507                                       session_key.data,
 508                                       gensec_ntlmssp_state->encrypted_session_key.length);
 509                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 510                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 511                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 512                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 513                                      gensec_ntlmssp_state->encrypted_session_key.length);
 514                         talloc_free(session_key.data);
 515                 }
 516         } else {
 517                 gensec_ntlmssp_state->session_key = session_key;
 518         }
 519
 520         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 521             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 522                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 523         } else {
 524                 nt_status = NT_STATUS_OK;
 525         }
 526
 527         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 528
 529         /* allow arbitarily many authentications, but watch that this will cause a
 530            memory leak, until the gensec_ntlmssp_state is shutdown
 531         */
 532
 533         if (gensec_ntlmssp_state->server_multiple_authentications) {
 534                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 535         } else {
 536                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 537         }
 538
 539         return nt_status;
 540 }
 541
 542
 543 /**
 544  * Next state function for the Authenticate packet
 545  *
 546  * @param gensec_security GENSEC state
 547  * @param out_mem_ctx Memory context for *out
 548  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 549  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 550  * @return Errors or NT_STATUS_OK if authentication sucessful
 551  */
 552
 553 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 554                              TALLOC_CTX *out_mem_ctx,
 555                              const DATA_BLOB in, DATA_BLOB *out)
 556 {
 557         struct gensec_ntlmssp_context *gensec_ntlmssp =
 558                 talloc_get_type_abort(gensec_security->private_data,
 559                                       struct gensec_ntlmssp_context);
 560         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 561         DATA_BLOB user_session_key = data_blob_null;
 562         DATA_BLOB lm_session_key = data_blob_null;
 563         NTSTATUS nt_status;
 564
 565         /* zero the outbound NTLMSSP packet */
 566         *out = data_blob_null;
 567
 568         nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in);
 569         if (!NT_STATUS_IS_OK(nt_status)) {
 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         nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state,
 582                                                          &user_session_key,
 583                                                          &lm_session_key);
 584         if (!NT_STATUS_IS_OK(nt_status)) {
 585                 return nt_status;
 586         }
 587
 588         nt_status = ntlmssp_server_postauth(gensec_security,
 589                                             &user_session_key,
 590                                             &lm_session_key);
 591         if (!NT_STATUS_IS_OK(nt_status)) {
 592                 return nt_status;
 593         }
 594
 595         return NT_STATUS_OK;
 596 }
 597
 598 /**
 599  * Return the challenge as determined by the authentication subsystem
 600  * @return an 8 byte random challenge
 601  */
 602
 603 static NTSTATUS auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 604                                            uint8_t chal[8])
 605 {
 606         struct gensec_ntlmssp_context *gensec_ntlmssp =
 607                 talloc_get_type_abort(gensec_ntlmssp_state->callback_private,
 608                                       struct gensec_ntlmssp_context);
 609         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 610         NTSTATUS status;
 611
 612         status = auth_context->get_challenge(auth_context, chal);
 613         if (!NT_STATUS_IS_OK(status)) {
 614                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 615                         nt_errstr(status)));
 616                 return status;
 617         }
 618
 619         return NT_STATUS_OK;
 620 }
 621
 622 /**
 623  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 624  *
 625  * @return If the effective challenge used by the auth subsystem may be modified
 626  */
 627 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 628 {
 629         struct gensec_ntlmssp_context *gensec_ntlmssp =
 630                 talloc_get_type_abort(gensec_ntlmssp_state->callback_private,
 631                                       struct gensec_ntlmssp_context);
 632         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 633
 634         return auth_context->challenge_may_be_modified(auth_context);
 635 }
 636
 637 /**
 638  * NTLM2 authentication modifies the effective challenge,
 639  * @param challenge The new challenge value
 640  */
 641 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 642 {
 643         struct gensec_ntlmssp_context *gensec_ntlmssp =
 644                 talloc_get_type_abort(gensec_ntlmssp_state->callback_private,
 645                                       struct gensec_ntlmssp_context);
 646         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 647         NTSTATUS nt_status;
 648         const uint8_t *chal;
 649
 650         if (challenge->length != 8) {
 651                 return NT_STATUS_INVALID_PARAMETER;
 652         }
 653
 654         chal = challenge->data;
 655
 656         nt_status = auth_context->set_challenge(auth_context,
 657                                                 chal,
 658                                                 "NTLMSSP callback (NTLM2)");
 659
 660         return nt_status;
 661 }
 662
 663 /**
 664  * Check the password on an NTLMSSP login.
 665  *
 666  * Return the session keys used on the connection.
 667  */
 668
 669 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 670                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 671 {
 672         struct gensec_ntlmssp_context *gensec_ntlmssp =
 673                 talloc_get_type_abort(gensec_ntlmssp_state->callback_private,
 674                                       struct gensec_ntlmssp_context);
 675         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 676         NTSTATUS nt_status;
 677         struct auth_usersupplied_info *user_info;
 678
 679         user_info = talloc(gensec_ntlmssp_state, struct auth_usersupplied_info);
 680         if (!user_info) {
 681                 return NT_STATUS_NO_MEMORY;
 682         }
 683
 684         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 685         user_info->flags = 0;
 686         user_info->mapped_state = false;
 687         user_info->client.account_name = gensec_ntlmssp_state->user;
 688         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 689         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 690         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 691
 692         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 693         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 694         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 695         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 696         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 697
 698         nt_status = auth_context->check_password(auth_context,
 699                                                  gensec_ntlmssp,
 700                                                  user_info,
 701                                                  &gensec_ntlmssp->server_info);
 702         talloc_free(user_info);
 703         NT_STATUS_NOT_OK_RETURN(nt_status);
 704
 705         if (gensec_ntlmssp->server_info->user_session_key.length) {
 706                 DEBUG(10, ("Got NT session key of length %u\n",
 707                            (unsigned)gensec_ntlmssp->server_info->user_session_key.length));
 708                 *user_session_key = gensec_ntlmssp->server_info->user_session_key;
 709         }
 710         if (gensec_ntlmssp->server_info->lm_session_key.length) {
 711                 DEBUG(10, ("Got LM session key of length %u\n",
 712                            (unsigned)gensec_ntlmssp->server_info->lm_session_key.length));
 713                 *lm_session_key = gensec_ntlmssp->server_info->lm_session_key;
 714         }
 715         return nt_status;
 716 }
 717
 718 /**
 719  * Return the credentials of a logged on user, including session keys
 720  * etc.
 721  *
 722  * Only valid after a successful authentication
 723  *
 724  * May only be called once per authentication.
 725  *
 726  */
 727
 728 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 729                                      struct auth_session_info **session_info)
 730 {
 731         NTSTATUS nt_status;
 732         struct gensec_ntlmssp_context *gensec_ntlmssp =
 733                 talloc_get_type_abort(gensec_security->private_data,
 734                                       struct gensec_ntlmssp_context);
 735         struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 736
 737         nt_status = auth_generate_session_info(gensec_ntlmssp_state,
 738                                                gensec_security->event_ctx,
 739                                                gensec_security->settings->lp_ctx,
 740                                                gensec_ntlmssp->server_info,
 741                                                session_info);
 742         NT_STATUS_NOT_OK_RETURN(nt_status);
 743
 744         (*session_info)->session_key = data_blob_talloc(*session_info,
 745                                                         gensec_ntlmssp_state->session_key.data,
 746                                                         gensec_ntlmssp_state->session_key.length);
 747
 748         return NT_STATUS_OK;
 749 }
 750
 751 /**
 752  * Start NTLMSSP on the server side
 753  *
 754  */
 755 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 756 {
 757         NTSTATUS nt_status;
 758         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 759         struct gensec_ntlmssp_context *gensec_ntlmssp;
 760
 761         nt_status = gensec_ntlmssp_start(gensec_security);
 762         NT_STATUS_NOT_OK_RETURN(nt_status);
 763
 764         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 765                                                struct gensec_ntlmssp_context);
 766         gensec_ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 767
 768         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 769
 770         gensec_ntlmssp_state->workstation = NULL;
 771         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->settings->lp_ctx);
 772
 773         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);
 774
 775         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 776
 777         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx)
 778                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 779
 780         gensec_ntlmssp_state->server_multiple_authentications = false;
 781
 782         gensec_ntlmssp_state->neg_flags =
 783                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 784
 785         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 786         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 787         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 788
 789         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 790                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 791         }
 792
 793         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 794                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 795         }
 796
 797         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 798                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 799         }
 800
 801         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 802                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 803         }
 804
 805         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 806                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 807         }
 808
 809         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 810                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 811         }
 812         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 813                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 814         }
 815
 816         gensec_ntlmssp->auth_context = gensec_security->auth_context;
 817
 818         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 819         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 820         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 821         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 822         if (lp_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 823                 gensec_ntlmssp_state->server.is_standalone = true;
 824         } else {
 825                 gensec_ntlmssp_state->server.is_standalone = false;
 826         }
 827
 828         return NT_STATUS_OK;
 829 }
 830