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         const uint8_t *cryptkey;
 128         const char *target_name;
 129
 130         /* parse the NTLMSSP packet */
 131 #if 0
 132         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 133 #endif
 134
 135         if (in.length) {
 136                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx,
 137                                                          &in, "Cdd",
 138                                                          "NTLMSSP",
 139                                                          &ntlmssp_command,
 140                                                          &neg_flags)) {
 141                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 142                                 "NTLMSSP Negotiate of length %u:\n",
 143                                 (unsigned int)in.length ));
 144                         dump_data(2, in.data, in.length);
 145                         return NT_STATUS_INVALID_PARAMETER;
 146                 }
 147                 debug_ntlmssp_flags(neg_flags);
 148         }
 149
 150         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 151
 152         /* Ask our caller what challenge they would like in the packet */
 153         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
 154         if (!cryptkey) {
 155                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
 156                 return NT_STATUS_INTERNAL_ERROR;
 157         }
 158
 159         /* Check if we may set the challenge */
 160         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 161                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 162         }
 163
 164         /* The flags we send back are not just the negotiated flags,
 165          * they are also 'what is in this packet'.  Therfore, we
 166          * operate on 'chal_flags' from here on
 167          */
 168
 169         chal_flags = gensec_ntlmssp_state->neg_flags;
 170
 171         /* get the right name to fill in as 'target' */
 172         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 173                                           neg_flags, &chal_flags);
 174         if (target_name == NULL)
 175                 return NT_STATUS_INVALID_PARAMETER;
 176
 177         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 178         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 179
 180         /* This creates the 'blob' of names that appears at the end of the packet */
 181         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 182                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 183                 const char *target_name_dns = "";
 184
 185                 /* Find out the DNS domain name */
 186                 dnsdomname[0] = '\0';
 187                 safe_strcpy(dnsdomname, lp_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
 188
 189                 /* Find out the DNS host name */
 190                 safe_strcpy(dnsname, gensec_ntlmssp_state->server_name, sizeof(dnsname) - 1);
 191                 if (dnsdomname[0] != '\0') {
 192                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 193                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 194                 }
 195                 strlower_m(dnsname);
 196
 197                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 198                         target_name_dns = dnsdomname;
 199                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 200                         target_name_dns = dnsname;
 201                 }
 202
 203                 msrpc_gen(out_mem_ctx,
 204                           &struct_blob, "aaaaa",
 205                           MsvAvNbDomainName, target_name,
 206                           MsvAvNbComputerName, gensec_ntlmssp_state->server_name,
 207                           MsvAvDnsDomainName, dnsdomname,
 208                           MsvAvDnsComputerName, dnsname,
 209                           MsvAvEOL, "");
 210         } else {
 211                 struct_blob = data_blob(NULL, 0);
 212         }
 213
 214         {
 215                 /* Marshal the packet in the right format, be it unicode or ASCII */
 216                 const char *gen_string;
 217                 if (gensec_ntlmssp_state->unicode) {
 218                         gen_string = "CdUdbddB";
 219                 } else {
 220                         gen_string = "CdAdbddB";
 221                 }
 222
 223                 msrpc_gen(out_mem_ctx,
 224                           out, gen_string,
 225                           "NTLMSSP",
 226                           NTLMSSP_CHALLENGE,
 227                           target_name,
 228                           chal_flags,
 229                           cryptkey, 8,
 230                           0, 0,
 231                           struct_blob.data, struct_blob.length);
 232         }
 233
 234         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 235
 236         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 237 }
 238
 239 /**
 240  * Next state function for the Authenticate packet
 241  *
 242  * @param gensec_ntlmssp_state NTLMSSP State
 243  * @param request The request, as a DATA_BLOB
 244  * @return Errors or NT_STATUS_OK.
 245  */
 246
 247 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 248                                        const DATA_BLOB request)
 249 {
 250         uint32_t ntlmssp_command, auth_flags;
 251         NTSTATUS nt_status;
 252
 253         uint8_t session_nonce_hash[16];
 254
 255         const char *parse_string;
 256         char *domain = NULL;
 257         char *user = NULL;
 258         char *workstation = NULL;
 259
 260 #if 0
 261         file_save("ntlmssp_auth.dat", request.data, request.length);
 262 #endif
 263
 264         if (gensec_ntlmssp_state->unicode) {
 265                 parse_string = "CdBBUUUBd";
 266         } else {
 267                 parse_string = "CdBBAAABd";
 268         }
 269
 270         /* zero these out */
 271         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 272         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 273         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 274
 275         gensec_ntlmssp_state->user = NULL;
 276         gensec_ntlmssp_state->domain = NULL;
 277         gensec_ntlmssp_state->workstation = NULL;
 278
 279         /* now the NTLMSSP encoded auth hashes */
 280         if (!msrpc_parse(gensec_ntlmssp_state,
 281                          &request, parse_string,
 282                          "NTLMSSP",
 283                          &ntlmssp_command,
 284                          &gensec_ntlmssp_state->lm_resp,
 285                          &gensec_ntlmssp_state->nt_resp,
 286                          &domain,
 287                          &user,
 288                          &workstation,
 289                          &gensec_ntlmssp_state->encrypted_session_key,
 290                          &auth_flags)) {
 291                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 292                 dump_data(10, request.data, request.length);
 293
 294                 /* zero this out */
 295                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 296                 auth_flags = 0;
 297
 298                 /* Try again with a shorter string (Win9X truncates this packet) */
 299                 if (gensec_ntlmssp_state->unicode) {
 300                         parse_string = "CdBBUUU";
 301                 } else {
 302                         parse_string = "CdBBAAA";
 303                 }
 304
 305                 /* now the NTLMSSP encoded auth hashes */
 306                 if (!msrpc_parse(gensec_ntlmssp_state,
 307                                  &request, parse_string,
 308                                  "NTLMSSP",
 309                                  &ntlmssp_command,
 310                                  &gensec_ntlmssp_state->lm_resp,
 311                                  &gensec_ntlmssp_state->nt_resp,
 312                                  &domain,
 313                                  &user,
 314                                  &workstation)) {
 315                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 316                         dump_data(2, request.data, request.length);
 317
 318                         return NT_STATUS_INVALID_PARAMETER;
 319                 }
 320         }
 321
 322         if (auth_flags)
 323                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 324
 325         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 326                 /* zero this out */
 327                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 328                 return nt_status;
 329         }
 330
 331         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 332                 /* zero this out */
 333                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 334                 return nt_status;
 335         }
 336
 337         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 338                 /* zero this out */
 339                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 340                 return nt_status;
 341         }
 342
 343         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 344                  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));
 345
 346 #if 0
 347         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 348         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 349 #endif
 350
 351         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 352            client challenge
 353
 354            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 355         */
 356         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 357                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 358                         struct MD5Context md5_session_nonce_ctx;
 359                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 360                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 361
 362                         gensec_ntlmssp_state->doing_ntlm2 = true;
 363
 364                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 365                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 366
 367                         MD5Init(&md5_session_nonce_ctx);
 368                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 369                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 370
 371                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 372                                                                session_nonce_hash, 8);
 373
 374                         /* LM response is no longer useful, zero it out */
 375                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 376
 377                         /* We changed the effective challenge - set it */
 378                         if (!NT_STATUS_IS_OK(nt_status =
 379                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 380                                                                                  &gensec_ntlmssp_state->chal))) {
 381                                 /* zero this out */
 382                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 383                                 return nt_status;
 384                         }
 385
 386                         /* LM Key is incompatible... */
 387                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 388                 }
 389         }
 390         return NT_STATUS_OK;
 391 }
 392
 393 /**
 394  * Next state function for the Authenticate packet
 395  * (after authentication - figures out the session keys etc)
 396  *
 397  * @param gensec_ntlmssp_state NTLMSSP State
 398  * @return Errors or NT_STATUS_OK.
 399  */
 400
 401 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 402                                         DATA_BLOB *user_session_key,
 403                                         DATA_BLOB *lm_session_key)
 404 {
 405         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 406         NTSTATUS nt_status;
 407         DATA_BLOB session_key = data_blob(NULL, 0);
 408
 409         if (user_session_key)
 410                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 411
 412         if (lm_session_key)
 413                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 414
 415         /* Handle the different session key derivation for NTLM2 */
 416         if (gensec_ntlmssp_state->doing_ntlm2) {
 417                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 418                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 419                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 420                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 421                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 422                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 423
 424                 } else {
 425                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 426                         session_key = data_blob(NULL, 0);
 427                 }
 428         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 429                 /* Ensure we can never get here on NTLMv2 */
 430                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 431
 432                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 433                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 434                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 435                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 436                                                           session_key.data);
 437                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 438                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 439                         } else {
 440
 441                                 /* When there is no LM response, just use zeros */
 442                                 static const uint8_t zeros[24];
 443                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 444                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 445                                                           session_key.data);
 446                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 447                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 448                         }
 449                 } else {
 450                         /* LM Key not selected */
 451                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 452
 453                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 454                         session_key = data_blob(NULL, 0);
 455                 }
 456
 457         } else if (user_session_key && user_session_key->data) {
 458                 session_key = data_blob_talloc(gensec_ntlmssp_state, user_session_key->data, user_session_key->length);
 459                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 460                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 461
 462                 /* LM Key not selected */
 463                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 464
 465         } else if (lm_session_key && lm_session_key->data) {
 466                 /* Very weird to have LM key, but no user session key, but anyway.. */
 467                 session_key = data_blob_talloc(gensec_ntlmssp_state, lm_session_key->data, lm_session_key->length);
 468                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 469                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 470
 471                 /* LM Key not selected */
 472                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 473
 474         } else {
 475                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 476                 session_key = data_blob(NULL, 0);
 477
 478                 /* LM Key not selected */
 479                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 480         }
 481
 482         /* With KEY_EXCH, the client supplies the proposed session key,
 483            but encrypts it with the long-term key */
 484         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 485                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 486                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 487                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 488                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 489                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
 490                         return NT_STATUS_INVALID_PARAMETER;
 491                 } else if (!session_key.data || session_key.length != 16) {
 492                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 493                                   (unsigned)session_key.length));
 494                         gensec_ntlmssp_state->session_key = session_key;
 495                 } else {
 496                         dump_data_pw("KEY_EXCH session key (enc):\n",
 497                                      gensec_ntlmssp_state->encrypted_session_key.data,
 498                                      gensec_ntlmssp_state->encrypted_session_key.length);
 499                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 500                                       session_key.data,
 501                                       gensec_ntlmssp_state->encrypted_session_key.length);
 502                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 503                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 504                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 505                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 506                                      gensec_ntlmssp_state->encrypted_session_key.length);
 507                         talloc_free(session_key.data);
 508                 }
 509         } else {
 510                 gensec_ntlmssp_state->session_key = session_key;
 511         }
 512
 513         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 514             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 515                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 516         } else {
 517                 nt_status = NT_STATUS_OK;
 518         }
 519
 520         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 521
 522         /* allow arbitarily many authentications, but watch that this will cause a
 523            memory leak, until the gensec_ntlmssp_state is shutdown
 524         */
 525
 526         if (gensec_ntlmssp_state->server_multiple_authentications) {
 527                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 528         } else {
 529                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 530         }
 531
 532         return nt_status;
 533 }
 534
 535
 536 /**
 537  * Next state function for the Authenticate packet
 538  *
 539  * @param gensec_security GENSEC state
 540  * @param out_mem_ctx Memory context for *out
 541  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 542  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 543  * @return Errors or NT_STATUS_OK if authentication sucessful
 544  */
 545
 546 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 547                              TALLOC_CTX *out_mem_ctx,
 548                              const DATA_BLOB in, DATA_BLOB *out)
 549 {
 550         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 551         DATA_BLOB user_session_key = data_blob(NULL, 0);
 552         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 553         NTSTATUS nt_status;
 554
 555         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
 556         if (!mem_ctx) {
 557                 return NT_STATUS_NO_MEMORY;
 558         }
 559
 560         /* zero the outbound NTLMSSP packet */
 561         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 562
 563         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 564                 talloc_free(mem_ctx);
 565                 return nt_status;
 566         }
 567
 568         /*
 569          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 570          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 571          * smb.conf file) and no NTLMv2 response was sent then the password check
 572          * will fail here. JRA.
 573          */
 574
 575         /* Finally, actually ask if the password is OK */
 576
 577         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
 578                                                                               &user_session_key, &lm_session_key))) {
 579                 talloc_free(mem_ctx);
 580                 return nt_status;
 581         }
 582
 583         if (gensec_security->want_features
 584             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
 585                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 586                 talloc_free(mem_ctx);
 587                 return nt_status;
 588         } else {
 589                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 590                 talloc_free(mem_ctx);
 591                 return NT_STATUS_OK;
 592         }
 593 }
 594
 595 /**
 596  * Return the challenge as determined by the authentication subsystem
 597  * @return an 8 byte random challenge
 598  */
 599
 600 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 601 {
 602         NTSTATUS status;
 603         uint8_t *chal = talloc_array(gensec_ntlmssp_state, uint8_t, 8);
 604         if (!chal) {
 605                 return NULL;
 606         }
 607
 608         status = gensec_ntlmssp_state->auth_context->get_challenge(gensec_ntlmssp_state->auth_context, chal);
 609         if (!NT_STATUS_IS_OK(status)) {
 610                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 611                         nt_errstr(status)));
 612                 return NULL;
 613         }
 614
 615         return chal;
 616 }
 617
 618 /**
 619  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 620  *
 621  * @return If the effective challenge used by the auth subsystem may be modified
 622  */
 623 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 624 {
 625         return gensec_ntlmssp_state->auth_context->challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 626 }
 627
 628 /**
 629  * NTLM2 authentication modifies the effective challenge,
 630  * @param challenge The new challenge value
 631  */
 632 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 633 {
 634         NTSTATUS nt_status;
 635         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 636         const uint8_t *chal;
 637
 638         if (challenge->length != 8) {
 639                 return NT_STATUS_INVALID_PARAMETER;
 640         }
 641
 642         chal = challenge->data;
 643
 644         nt_status = gensec_ntlmssp_state->auth_context->set_challenge(auth_context,
 645                                                                       chal,
 646                                                                       "NTLMSSP callback (NTLM2)");
 647
 648         return nt_status;
 649 }
 650
 651 /**
 652  * Check the password on an NTLMSSP login.
 653  *
 654  * Return the session keys used on the connection.
 655  */
 656
 657 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 658                                             TALLOC_CTX *mem_ctx,
 659                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 660 {
 661         NTSTATUS nt_status;
 662         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
 663         if (!user_info) {
 664                 return NT_STATUS_NO_MEMORY;
 665         }
 666
 667         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 668         user_info->flags = 0;
 669         user_info->mapped_state = false;
 670         user_info->client.account_name = gensec_ntlmssp_state->user;
 671         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 672         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 673         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp_state->gensec_security);
 674
 675         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 676         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 677         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 678         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 679         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 680
 681         nt_status = gensec_ntlmssp_state->auth_context->check_password(gensec_ntlmssp_state->auth_context,
 682                                                                        mem_ctx,
 683                                                                        user_info,
 684                                                                        &gensec_ntlmssp_state->server_info);
 685         talloc_free(user_info);
 686         NT_STATUS_NOT_OK_RETURN(nt_status);
 687
 688         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
 689
 690         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 691                 DEBUG(10, ("Got NT session key of length %u\n",
 692                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 693                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
 694                         return NT_STATUS_NO_MEMORY;
 695                 }
 696
 697                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
 698         }
 699         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 700                 DEBUG(10, ("Got LM session key of length %u\n",
 701                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 702                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
 703                         return NT_STATUS_NO_MEMORY;
 704                 }
 705
 706                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
 707         }
 708         return nt_status;
 709 }
 710
 711 /**
 712  * Return the credentials of a logged on user, including session keys
 713  * etc.
 714  *
 715  * Only valid after a successful authentication
 716  *
 717  * May only be called once per authentication.
 718  *
 719  */
 720
 721 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 722                                      struct auth_session_info **session_info)
 723 {
 724         NTSTATUS nt_status;
 725         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 726
 727         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);
 728         NT_STATUS_NOT_OK_RETURN(nt_status);
 729
 730         (*session_info)->session_key = data_blob_talloc(*session_info,
 731                                                         gensec_ntlmssp_state->session_key.data,
 732                                                         gensec_ntlmssp_state->session_key.length);
 733
 734         return NT_STATUS_OK;
 735 }
 736
 737 /**
 738  * Start NTLMSSP on the server side
 739  *
 740  */
 741 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 742 {
 743         NTSTATUS nt_status;
 744         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 745
 746         nt_status = gensec_ntlmssp_start(gensec_security);
 747         NT_STATUS_NOT_OK_RETURN(nt_status);
 748
 749         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 750
 751         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 752
 753         gensec_ntlmssp_state->workstation = NULL;
 754         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->settings->lp_ctx);
 755
 756         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);
 757
 758         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 759
 760         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx)
 761                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 762
 763         gensec_ntlmssp_state->server_multiple_authentications = false;
 764
 765         gensec_ntlmssp_state->neg_flags =
 766                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 767
 768         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 769         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 770         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 771
 772         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 773                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 774         }
 775
 776         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 777                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 778         }
 779
 780         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 781                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 782         }
 783
 784         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 785                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 786         }
 787
 788         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 789                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 790         }
 791
 792         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 793                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 794         }
 795         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 796                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 797         }
 798
 799         gensec_ntlmssp_state->auth_context = gensec_security->auth_context;
 800
 801         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 802         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 803         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 804         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 805         gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->settings->lp_ctx);
 806
 807         return NT_STATUS_OK;
 808 }
 809