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