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_role == ROLE_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_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 124         DATA_BLOB struct_blob;
 125         uint32_t neg_flags = 0;
 126         uint32_t ntlmssp_command, chal_flags;
 127         uint8_t cryptkey[8];
 128         const char *target_name;
 129         NTSTATUS status;
 130
 131         /* parse the NTLMSSP packet */
 132 #if 0
 133         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 134 #endif
 135
 136         if (in.length) {
 137                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx,
 138                                                          &in, "Cdd",
 139                                                          "NTLMSSP",
 140                                                          &ntlmssp_command,
 141                                                          &neg_flags)) {
 142                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 143                                 "NTLMSSP Negotiate of length %u:\n",
 144                                 (unsigned int)in.length ));
 145                         dump_data(2, in.data, in.length);
 146                         return NT_STATUS_INVALID_PARAMETER;
 147                 }
 148                 debug_ntlmssp_flags(neg_flags);
 149         }
 150
 151         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 152
 153         /* Ask our caller what challenge they would like in the packet */
 154         status = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state, cryptkey);
 155         if (!NT_STATUS_IS_OK(status)) {
 156                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge: %s\n",
 157                           nt_errstr(status)));
 158                 return status;
 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_NEGOTIATE_TARGET_INFO) {
 184                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 185
 186                 /* Find out the DNS domain name */
 187                 dnsdomname[0] = '\0';
 188                 safe_strcpy(dnsdomname, lp_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
 189
 190                 /* Find out the DNS host name */
 191                 safe_strcpy(dnsname, gensec_ntlmssp_state->server_name, sizeof(dnsname) - 1);
 192                 if (dnsdomname[0] != '\0') {
 193                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 194                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 195                 }
 196                 strlower_m(dnsname);
 197
 198                 msrpc_gen(out_mem_ctx,
 199                           &struct_blob, "aaaaa",
 200                           MsvAvNbDomainName, target_name,
 201                           MsvAvNbComputerName, gensec_ntlmssp_state->server_name,
 202                           MsvAvDnsDomainName, dnsdomname,
 203                           MsvAvDnsComputerName, dnsname,
 204                           MsvAvEOL, "");
 205         } else {
 206                 struct_blob = data_blob(NULL, 0);
 207         }
 208
 209         {
 210                 /* Marshal the packet in the right format, be it unicode or ASCII */
 211                 const char *gen_string;
 212                 if (gensec_ntlmssp_state->unicode) {
 213                         gen_string = "CdUdbddB";
 214                 } else {
 215                         gen_string = "CdAdbddB";
 216                 }
 217
 218                 msrpc_gen(out_mem_ctx,
 219                           out, gen_string,
 220                           "NTLMSSP",
 221                           NTLMSSP_CHALLENGE,
 222                           target_name,
 223                           chal_flags,
 224                           cryptkey, 8,
 225                           0, 0,
 226                           struct_blob.data, struct_blob.length);
 227         }
 228
 229         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 230
 231         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 232 }
 233
 234 /**
 235  * Next state function for the Authenticate packet
 236  *
 237  * @param gensec_ntlmssp_state NTLMSSP State
 238  * @param request The request, as a DATA_BLOB
 239  * @return Errors or NT_STATUS_OK.
 240  */
 241
 242 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 243                                        const DATA_BLOB request)
 244 {
 245         uint32_t ntlmssp_command, auth_flags;
 246         NTSTATUS nt_status;
 247
 248         uint8_t session_nonce_hash[16];
 249
 250         const char *parse_string;
 251         char *domain = NULL;
 252         char *user = NULL;
 253         char *workstation = NULL;
 254
 255 #if 0
 256         file_save("ntlmssp_auth.dat", request.data, request.length);
 257 #endif
 258
 259         if (gensec_ntlmssp_state->unicode) {
 260                 parse_string = "CdBBUUUBd";
 261         } else {
 262                 parse_string = "CdBBAAABd";
 263         }
 264
 265         /* zero these out */
 266         data_blob_free(&gensec_ntlmssp_state->session_key);
 267         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 268         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 269         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 270
 271         gensec_ntlmssp_state->user = NULL;
 272         gensec_ntlmssp_state->domain = NULL;
 273         gensec_ntlmssp_state->workstation = NULL;
 274
 275         /* now the NTLMSSP encoded auth hashes */
 276         if (!msrpc_parse(gensec_ntlmssp_state,
 277                          &request, parse_string,
 278                          "NTLMSSP",
 279                          &ntlmssp_command,
 280                          &gensec_ntlmssp_state->lm_resp,
 281                          &gensec_ntlmssp_state->nt_resp,
 282                          &domain,
 283                          &user,
 284                          &workstation,
 285                          &gensec_ntlmssp_state->encrypted_session_key,
 286                          &auth_flags)) {
 287                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 288                 dump_data(10, request.data, request.length);
 289
 290                 /* zero this out */
 291                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 292                 auth_flags = 0;
 293
 294                 /* Try again with a shorter string (Win9X truncates this packet) */
 295                 if (gensec_ntlmssp_state->unicode) {
 296                         parse_string = "CdBBUUU";
 297                 } else {
 298                         parse_string = "CdBBAAA";
 299                 }
 300
 301                 /* now the NTLMSSP encoded auth hashes */
 302                 if (!msrpc_parse(gensec_ntlmssp_state,
 303                                  &request, parse_string,
 304                                  "NTLMSSP",
 305                                  &ntlmssp_command,
 306                                  &gensec_ntlmssp_state->lm_resp,
 307                                  &gensec_ntlmssp_state->nt_resp,
 308                                  &domain,
 309                                  &user,
 310                                  &workstation)) {
 311                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 312                         dump_data(2, request.data, request.length);
 313
 314                         return NT_STATUS_INVALID_PARAMETER;
 315                 }
 316         }
 317
 318         if (auth_flags)
 319                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 320
 321         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 322                 /* zero this out */
 323                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 324                 return nt_status;
 325         }
 326
 327         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 328                 /* zero this out */
 329                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 330                 return nt_status;
 331         }
 332
 333         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 334                 /* zero this out */
 335                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 336                 return nt_status;
 337         }
 338
 339         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 340                  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));
 341
 342 #if 0
 343         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 344         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 345 #endif
 346
 347         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 348            client challenge
 349
 350            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 351         */
 352         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 353                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 354                         struct MD5Context md5_session_nonce_ctx;
 355                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 356                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 357
 358                         gensec_ntlmssp_state->doing_ntlm2 = true;
 359
 360                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 361                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 362
 363                         MD5Init(&md5_session_nonce_ctx);
 364                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 365                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 366
 367                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 368                                                                session_nonce_hash, 8);
 369
 370                         /* LM response is no longer useful, zero it out */
 371                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 372
 373                         /* We changed the effective challenge - set it */
 374                         if (!NT_STATUS_IS_OK(nt_status =
 375                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 376                                                                                  &gensec_ntlmssp_state->chal))) {
 377                                 /* zero this out */
 378                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 379                                 return nt_status;
 380                         }
 381
 382                         /* LM Key is incompatible... */
 383                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 384                 }
 385         }
 386         return NT_STATUS_OK;
 387 }
 388
 389 /**
 390  * Next state function for the Authenticate packet
 391  * (after authentication - figures out the session keys etc)
 392  *
 393  * @param gensec_ntlmssp_state NTLMSSP State
 394  * @return Errors or NT_STATUS_OK.
 395  */
 396
 397 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 398                                         DATA_BLOB *user_session_key,
 399                                         DATA_BLOB *lm_session_key)
 400 {
 401         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 402         NTSTATUS nt_status;
 403         DATA_BLOB session_key = data_blob(NULL, 0);
 404
 405         if (!(gensec_security->want_features
 406               & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY))) {
 407                 return NT_STATUS_OK;
 408         }
 409
 410         if (user_session_key)
 411                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 412
 413         if (lm_session_key)
 414                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 415
 416         /* Handle the different session key derivation for NTLM2 */
 417         if (gensec_ntlmssp_state->doing_ntlm2) {
 418                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 419                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 420                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 421                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 422                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 423                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 424
 425                 } else {
 426                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 427                         session_key = data_blob(NULL, 0);
 428                 }
 429         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 430                 /* Ensure we can never get here on NTLMv2 */
 431                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 432
 433                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 434                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 435                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 436                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 437                                                           session_key.data);
 438                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 439                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 440                         } else {
 441
 442                                 /* When there is no LM response, just use zeros */
 443                                 static const uint8_t zeros[24];
 444                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 445                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 446                                                           session_key.data);
 447                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 448                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 449                         }
 450                 } else {
 451                         /* LM Key not selected */
 452                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 453
 454                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 455                         session_key = data_blob(NULL, 0);
 456                 }
 457
 458         } else if (user_session_key && user_session_key->data) {
 459                 session_key = data_blob_talloc(gensec_ntlmssp_state, user_session_key->data, user_session_key->length);
 460                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 461                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 462
 463                 /* LM Key not selected */
 464                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 465
 466         } else if (lm_session_key && lm_session_key->data) {
 467                 /* Very weird to have LM key, but no user session key, but anyway.. */
 468                 session_key = data_blob_talloc(gensec_ntlmssp_state, lm_session_key->data, lm_session_key->length);
 469                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 470                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 471
 472                 /* LM Key not selected */
 473                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 474
 475         } else {
 476                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 477                 session_key = data_blob(NULL, 0);
 478
 479                 /* LM Key not selected */
 480                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 481         }
 482
 483         /* With KEY_EXCH, the client supplies the proposed session key,
 484            but encrypts it with the long-term key */
 485         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 486                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 487                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 488                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 489                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 490                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
 491                         return NT_STATUS_INVALID_PARAMETER;
 492                 } else if (!session_key.data || session_key.length != 16) {
 493                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 494                                   (unsigned)session_key.length));
 495                         gensec_ntlmssp_state->session_key = session_key;
 496                 } else {
 497                         dump_data_pw("KEY_EXCH session key (enc):\n",
 498                                      gensec_ntlmssp_state->encrypted_session_key.data,
 499                                      gensec_ntlmssp_state->encrypted_session_key.length);
 500                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 501                                       session_key.data,
 502                                       gensec_ntlmssp_state->encrypted_session_key.length);
 503                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 504                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 505                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 506                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 507                                      gensec_ntlmssp_state->encrypted_session_key.length);
 508                         talloc_free(session_key.data);
 509                 }
 510         } else {
 511                 gensec_ntlmssp_state->session_key = session_key;
 512         }
 513
 514         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 515             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 516                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 517         } else {
 518                 nt_status = NT_STATUS_OK;
 519         }
 520
 521         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 522
 523         /* allow arbitarily many authentications, but watch that this will cause a
 524            memory leak, until the gensec_ntlmssp_state is shutdown
 525         */
 526
 527         if (gensec_ntlmssp_state->server_multiple_authentications) {
 528                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 529         } else {
 530                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 531         }
 532
 533         return nt_status;
 534 }
 535
 536
 537 /**
 538  * Next state function for the Authenticate packet
 539  *
 540  * @param gensec_security GENSEC state
 541  * @param out_mem_ctx Memory context for *out
 542  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 543  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 544  * @return Errors or NT_STATUS_OK if authentication sucessful
 545  */
 546
 547 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 548                              TALLOC_CTX *out_mem_ctx,
 549                              const DATA_BLOB in, DATA_BLOB *out)
 550 {
 551         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 552         DATA_BLOB user_session_key = data_blob_null;
 553         DATA_BLOB lm_session_key = data_blob_null;
 554         NTSTATUS nt_status;
 555
 556         /* zero the outbound NTLMSSP packet */
 557         *out = data_blob_null;
 558
 559         nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in);
 560         if (!NT_STATUS_IS_OK(nt_status)) {
 561                 return nt_status;
 562         }
 563
 564         /*
 565          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 566          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 567          * smb.conf file) and no NTLMv2 response was sent then the password check
 568          * will fail here. JRA.
 569          */
 570
 571         /* Finally, actually ask if the password is OK */
 572         nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state,
 573                                                          &user_session_key,
 574                                                          &lm_session_key);
 575         if (!NT_STATUS_IS_OK(nt_status)) {
 576                 return nt_status;
 577         }
 578
 579         nt_status = ntlmssp_server_postauth(gensec_security,
 580                                             &user_session_key,
 581                                             &lm_session_key);
 582         if (!NT_STATUS_IS_OK(nt_status)) {
 583                 return nt_status;
 584         }
 585
 586         return NT_STATUS_OK;
 587 }
 588
 589 /**
 590  * Return the challenge as determined by the authentication subsystem
 591  * @return an 8 byte random challenge
 592  */
 593
 594 static NTSTATUS auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 595                                            uint8_t chal[8])
 596 {
 597         NTSTATUS status;
 598
 599         status = gensec_ntlmssp_state->auth_context->get_challenge(gensec_ntlmssp_state->auth_context, chal);
 600         if (!NT_STATUS_IS_OK(status)) {
 601                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 602                         nt_errstr(status)));
 603                 return status;
 604         }
 605
 606         return NT_STATUS_OK;
 607 }
 608
 609 /**
 610  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 611  *
 612  * @return If the effective challenge used by the auth subsystem may be modified
 613  */
 614 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 615 {
 616         return gensec_ntlmssp_state->auth_context->challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 617 }
 618
 619 /**
 620  * NTLM2 authentication modifies the effective challenge,
 621  * @param challenge The new challenge value
 622  */
 623 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 624 {
 625         NTSTATUS nt_status;
 626         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 627         const uint8_t *chal;
 628
 629         if (challenge->length != 8) {
 630                 return NT_STATUS_INVALID_PARAMETER;
 631         }
 632
 633         chal = challenge->data;
 634
 635         nt_status = gensec_ntlmssp_state->auth_context->set_challenge(auth_context,
 636                                                                       chal,
 637                                                                       "NTLMSSP callback (NTLM2)");
 638
 639         return nt_status;
 640 }
 641
 642 /**
 643  * Check the password on an NTLMSSP login.
 644  *
 645  * Return the session keys used on the connection.
 646  */
 647
 648 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 649                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 650 {
 651         NTSTATUS nt_status;
 652         struct auth_usersupplied_info *user_info;
 653
 654         user_info = talloc(gensec_ntlmssp_state, struct auth_usersupplied_info);
 655         if (!user_info) {
 656                 return NT_STATUS_NO_MEMORY;
 657         }
 658
 659         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 660         user_info->flags = 0;
 661         user_info->mapped_state = false;
 662         user_info->client.account_name = gensec_ntlmssp_state->user;
 663         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 664         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 665         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp_state->gensec_security);
 666
 667         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 668         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 669         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 670         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 671         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 672
 673         nt_status = gensec_ntlmssp_state->auth_context->check_password(gensec_ntlmssp_state->auth_context,
 674                                                                        gensec_ntlmssp_state,
 675                                                                        user_info,
 676                                                                        &gensec_ntlmssp_state->server_info);
 677         talloc_free(user_info);
 678         NT_STATUS_NOT_OK_RETURN(nt_status);
 679
 680         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 681                 DEBUG(10, ("Got NT session key of length %u\n",
 682                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 683                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
 684         }
 685         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 686                 DEBUG(10, ("Got LM session key of length %u\n",
 687                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 688                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
 689         }
 690         return nt_status;
 691 }
 692
 693 /**
 694  * Return the credentials of a logged on user, including session keys
 695  * etc.
 696  *
 697  * Only valid after a successful authentication
 698  *
 699  * May only be called once per authentication.
 700  *
 701  */
 702
 703 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 704                                      struct auth_session_info **session_info)
 705 {
 706         NTSTATUS nt_status;
 707         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 708
 709         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->settings->lp_ctx, gensec_ntlmssp_state->server_info, session_info);
 710         NT_STATUS_NOT_OK_RETURN(nt_status);
 711
 712         (*session_info)->session_key = data_blob_talloc(*session_info,
 713                                                         gensec_ntlmssp_state->session_key.data,
 714                                                         gensec_ntlmssp_state->session_key.length);
 715
 716         return NT_STATUS_OK;
 717 }
 718
 719 /**
 720  * Start NTLMSSP on the server side
 721  *
 722  */
 723 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 724 {
 725         NTSTATUS nt_status;
 726         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 727
 728         nt_status = gensec_ntlmssp_start(gensec_security);
 729         NT_STATUS_NOT_OK_RETURN(nt_status);
 730
 731         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 732
 733         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 734
 735         gensec_ntlmssp_state->workstation = NULL;
 736         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->settings->lp_ctx);
 737
 738         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);
 739
 740         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 741
 742         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx)
 743                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 744
 745         gensec_ntlmssp_state->server_multiple_authentications = false;
 746
 747         gensec_ntlmssp_state->neg_flags =
 748                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 749
 750         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 751         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 752         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 753
 754         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 755                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 756         }
 757
 758         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 759                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 760         }
 761
 762         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 763                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 764         }
 765
 766         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 767                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 768         }
 769
 770         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 771                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 772         }
 773
 774         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 775                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 776         }
 777         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 778                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 779         }
 780
 781         gensec_ntlmssp_state->auth_context = gensec_security->auth_context;
 782
 783         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 784         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 785         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 786         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 787         gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->settings->lp_ctx);
 788
 789         return NT_STATUS_OK;
 790 }
 791