source4/auth/ntlmssp/ntlmssp_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, client server side parsing
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "auth/ntlmssp/ntlmssp.h"
  26 #include "auth/ntlmssp/msrpc_parse.h"
  27 #include "lib/crypto/crypto.h"
  28 #include "system/filesys.h"
  29 #include "libcli/auth/libcli_auth.h"
  30 #include "auth/credentials/credentials.h"
  31 #include "auth/gensec/gensec.h"
  32 #include "auth/auth.h"
  33 #include "auth/ntlm/auth_proto.h"
  34 #include "param/param.h"
  35 #include "auth/session_proto.h"
  36
  37 /**
  38  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  39  *
  40  */
  41
  42 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user)
  43 {
  44         if (!user) {
  45                 /* it should be at least "" */
  46                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  47                 return NT_STATUS_INVALID_PARAMETER;
  48         }
  49         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
  50         if (!gensec_ntlmssp_state->user) {
  51                 return NT_STATUS_NO_MEMORY;
  52         }
  53         return NT_STATUS_OK;
  54 }
  55
  56 /**
  57  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  58  *
  59  */
  60 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain)
  61 {
  62         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
  63         if (!gensec_ntlmssp_state->domain) {
  64                 return NT_STATUS_NO_MEMORY;
  65         }
  66         return NT_STATUS_OK;
  67 }
  68
  69 /**
  70  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  71  *
  72  */
  73 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation)
  74 {
  75         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
  76         if (!gensec_ntlmssp_state->workstation) {
  77                 return NT_STATUS_NO_MEMORY;
  78         }
  79         return NT_STATUS_OK;
  80 }
  81
  82 /**
  83  * Determine correct target name flags for reply, given server role
  84  * and negotiated flags
  85  *
  86  * @param gensec_ntlmssp_state NTLMSSP State
  87  * @param neg_flags The flags from the packet
  88  * @param chal_flags The flags to be set in the reply packet
  89  * @return The 'target name' string.
  90  */
  91
  92 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
  93                                        uint32_t neg_flags, uint32_t *chal_flags)
  94 {
  95         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  96                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
  97                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  98                 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) {
  99                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 100                         return gensec_ntlmssp_state->server_name;
 101                 } else {
 102                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 103                         return gensec_ntlmssp_state->domain;
 104                 };
 105         } else {
 106                 return "";
 107         }
 108 }
 109
 110
 111
 112 /**
 113  * Next state function for the Negotiate packet
 114  *
 115  * @param gensec_security GENSEC state
 116  * @param out_mem_ctx Memory context for *out
 117  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 118  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 119  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 120  */
 121
 122 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 123                                   TALLOC_CTX *out_mem_ctx,
 124                                   const DATA_BLOB in, DATA_BLOB *out)
 125 {
 126         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 127         DATA_BLOB struct_blob;
 128         char dnsname[MAXHOSTNAMELEN], dnsdomname[MAXHOSTNAMELEN];
 129         const char *p;
 130         uint32_t neg_flags = 0;
 131         uint32_t ntlmssp_command, chal_flags;
 132         const uint8_t *cryptkey;
 133         const char *target_name;
 134
 135         /* parse the NTLMSSP packet */
 136 #if 0
 137         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 138 #endif
 139
 140         if (in.length) {
 141                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx,
 142                                  lp_iconv_convenience(gensec_security->lp_ctx),
 143                                                          &in, "Cdd",
 144                                                          "NTLMSSP",
 145                                                          &ntlmssp_command,
 146                                                          &neg_flags)) {
 147                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 148                                 "NTLMSSP Negotiate of length %u:\n",
 149                                 (unsigned int)in.length ));
 150                         dump_data(2, in.data, in.length);
 151                         return NT_STATUS_INVALID_PARAMETER;
 152                 }
 153                 debug_ntlmssp_flags(neg_flags);
 154         }
 155
 156         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
 157
 158         /* Ask our caller what challenge they would like in the packet */
 159         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
 160         if (!cryptkey) {
 161                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
 162                 return NT_STATUS_INTERNAL_ERROR;
 163         }
 164
 165         /* Check if we may set the challenge */
 166         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
 167                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 168         }
 169
 170         /* The flags we send back are not just the negotiated flags,
 171          * they are also 'what is in this packet'.  Therfore, we
 172          * operate on 'chal_flags' from here on
 173          */
 174
 175         chal_flags = gensec_ntlmssp_state->neg_flags;
 176
 177         /* get the right name to fill in as 'target' */
 178         target_name = ntlmssp_target_name(gensec_ntlmssp_state,
 179                                           neg_flags, &chal_flags);
 180         if (target_name == NULL)
 181                 return NT_STATUS_INVALID_PARAMETER;
 182
 183         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 184         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
 185
 186         dnsname[0] = '\0';
 187         if (gethostname(dnsname, sizeof(dnsname)) == -1) {
 188                 DEBUG(0,("gethostname failed\n"));
 189                 return NT_STATUS_UNSUCCESSFUL;
 190         }
 191
 192         /* This should be a 'netbios domain -> DNS domain' mapping */
 193         p = strchr(dnsname, '.');
 194         if (p != NULL) {
 195                 safe_strcpy(dnsdomname, p+1, sizeof(dnsdomname));
 196                 strlower_m(dnsdomname);
 197         } else {
 198                 dnsdomname[0] = '\0';
 199         }
 200
 201         /* This creates the 'blob' of names that appears at the end of the packet */
 202         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 203         {
 204                 const char *target_name_dns = "";
 205                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 206                         target_name_dns = dnsdomname;
 207                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 208                         target_name_dns = dnsname;
 209                 }
 210
 211                 msrpc_gen(out_mem_ctx,
 212                           lp_iconv_convenience(gensec_security->lp_ctx),
 213                           &struct_blob, "aaaaa",
 214                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 215                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
 216                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 217                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 218                           0, "");
 219         } else {
 220                 struct_blob = data_blob(NULL, 0);
 221         }
 222
 223         {
 224                 /* Marshel the packet in the right format, be it unicode or ASCII */
 225                 const char *gen_string;
 226                 if (gensec_ntlmssp_state->unicode) {
 227                         gen_string = "CdUdbddB";
 228                 } else {
 229                         gen_string = "CdAdbddB";
 230                 }
 231
 232                 msrpc_gen(out_mem_ctx,
 233                           lp_iconv_convenience(gensec_security->lp_ctx),
 234                           out, gen_string,
 235                           "NTLMSSP",
 236                           NTLMSSP_CHALLENGE,
 237                           target_name,
 238                           chal_flags,
 239                           cryptkey, 8,
 240                           0, 0,
 241                           struct_blob.data, struct_blob.length);
 242         }
 243
 244         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 245
 246         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 247 }
 248
 249 /**
 250  * Next state function for the Authenticate packet
 251  *
 252  * @param gensec_ntlmssp_state NTLMSSP State
 253  * @param request The request, as a DATA_BLOB
 254  * @return Errors or NT_STATUS_OK.
 255  */
 256
 257 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 258                                        const DATA_BLOB request)
 259 {
 260         uint32_t ntlmssp_command, auth_flags;
 261         NTSTATUS nt_status;
 262
 263         uint8_t session_nonce_hash[16];
 264
 265         const char *parse_string;
 266         char *domain = NULL;
 267         char *user = NULL;
 268         char *workstation = NULL;
 269
 270 #if 0
 271         file_save("ntlmssp_auth.dat", request.data, request.length);
 272 #endif
 273
 274         if (gensec_ntlmssp_state->unicode) {
 275                 parse_string = "CdBBUUUBd";
 276         } else {
 277                 parse_string = "CdBBAAABd";
 278         }
 279
 280         /* zero these out */
 281         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 282         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 283         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 284
 285         gensec_ntlmssp_state->user = NULL;
 286         gensec_ntlmssp_state->domain = NULL;
 287         gensec_ntlmssp_state->workstation = NULL;
 288
 289         /* now the NTLMSSP encoded auth hashes */
 290         if (!msrpc_parse(gensec_ntlmssp_state,
 291                          lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
 292                          &request, parse_string,
 293                          "NTLMSSP",
 294                          &ntlmssp_command,
 295                          &gensec_ntlmssp_state->lm_resp,
 296                          &gensec_ntlmssp_state->nt_resp,
 297                          &domain,
 298                          &user,
 299                          &workstation,
 300                          &gensec_ntlmssp_state->encrypted_session_key,
 301                          &auth_flags)) {
 302                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 303                 dump_data(10, request.data, request.length);
 304
 305                 /* zero this out */
 306                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 307                 auth_flags = 0;
 308
 309                 /* Try again with a shorter string (Win9X truncates this packet) */
 310                 if (gensec_ntlmssp_state->unicode) {
 311                         parse_string = "CdBBUUU";
 312                 } else {
 313                         parse_string = "CdBBAAA";
 314                 }
 315
 316                 /* now the NTLMSSP encoded auth hashes */
 317                 if (!msrpc_parse(gensec_ntlmssp_state,
 318                                  lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
 319                                  &request, parse_string,
 320                                  "NTLMSSP",
 321                                  &ntlmssp_command,
 322                                  &gensec_ntlmssp_state->lm_resp,
 323                                  &gensec_ntlmssp_state->nt_resp,
 324                                  &domain,
 325                                  &user,
 326                                  &workstation)) {
 327                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 328                         dump_data(2, request.data, request.length);
 329
 330                         return NT_STATUS_INVALID_PARAMETER;
 331                 }
 332         }
 333
 334         if (auth_flags)
 335                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 336
 337         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 338                 /* zero this out */
 339                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 340                 return nt_status;
 341         }
 342
 343         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
 344                 /* zero this out */
 345                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 346                 return nt_status;
 347         }
 348
 349         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 350                 /* zero this out */
 351                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 352                 return nt_status;
 353         }
 354
 355         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 356                  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));
 357
 358 #if 0
 359         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 360         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 361 #endif
 362
 363         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 364            client challenge
 365
 366            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 367         */
 368         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 369                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 370                         struct MD5Context md5_session_nonce_ctx;
 371                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 372                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 373
 374                         gensec_ntlmssp_state->doing_ntlm2 = true;
 375
 376                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 377                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 378
 379                         MD5Init(&md5_session_nonce_ctx);
 380                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 381                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 382
 383                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 384                                                                session_nonce_hash, 8);
 385
 386                         /* LM response is no longer useful, zero it out */
 387                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 388
 389                         /* We changed the effective challenge - set it */
 390                         if (!NT_STATUS_IS_OK(nt_status =
 391                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 392                                                                                  &gensec_ntlmssp_state->chal))) {
 393                                 /* zero this out */
 394                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 395                                 return nt_status;
 396                         }
 397
 398                         /* LM Key is incompatible... */
 399                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 400                 }
 401         }
 402         return NT_STATUS_OK;
 403 }
 404
 405 /**
 406  * Next state function for the Authenticate packet
 407  * (after authentication - figures out the session keys etc)
 408  *
 409  * @param gensec_ntlmssp_state NTLMSSP State
 410  * @return Errors or NT_STATUS_OK.
 411  */
 412
 413 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 414                                         DATA_BLOB *user_session_key,
 415                                         DATA_BLOB *lm_session_key)
 416 {
 417         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 418         NTSTATUS nt_status;
 419         DATA_BLOB session_key = data_blob(NULL, 0);
 420
 421         if (user_session_key)
 422                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 423
 424         if (lm_session_key)
 425                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 426
 427         /* Handle the different session key derivation for NTLM2 */
 428         if (gensec_ntlmssp_state->doing_ntlm2) {
 429                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 430                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 431                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 432                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 433                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 434                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 435
 436                 } else {
 437                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 438                         session_key = data_blob(NULL, 0);
 439                 }
 440         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 441                 /* Ensure we can never get here on NTLMv2 */
 442                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 443
 444                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 445                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 446                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 447                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 448                                                           session_key.data);
 449                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 450                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 451                         } else {
 452
 453                                 /* When there is no LM response, just use zeros */
 454                                 static const uint8_t zeros[24];
 455                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 456                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 457                                                           session_key.data);
 458                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 459                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 460                         }
 461                 } else {
 462                         /* LM Key not selected */
 463                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 464
 465                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 466                         session_key = data_blob(NULL, 0);
 467                 }
 468
 469         } else if (user_session_key && user_session_key->data) {
 470                 session_key = *user_session_key;
 471                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 472                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 473
 474                 /* LM Key not selected */
 475                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 476
 477         } else if (lm_session_key && lm_session_key->data) {
 478                 /* Very weird to have LM key, but no user session key, but anyway.. */
 479                 session_key = *lm_session_key;
 480                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 481                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 482
 483                 /* LM Key not selected */
 484                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 485
 486         } else {
 487                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 488                 session_key = data_blob(NULL, 0);
 489
 490                 /* LM Key not selected */
 491                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 492         }
 493
 494         /* With KEY_EXCH, the client supplies the proposed session key,
 495            but encrypts it with the long-term key */
 496         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 497                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 498                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 499                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 500                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 501                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
 502                         return NT_STATUS_INVALID_PARAMETER;
 503                 } else if (!session_key.data || session_key.length != 16) {
 504                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 505                                   (unsigned)session_key.length));
 506                         gensec_ntlmssp_state->session_key = session_key;
 507                 } else {
 508                         dump_data_pw("KEY_EXCH session key (enc):\n",
 509                                      gensec_ntlmssp_state->encrypted_session_key.data,
 510                                      gensec_ntlmssp_state->encrypted_session_key.length);
 511                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 512                                       session_key.data,
 513                                       gensec_ntlmssp_state->encrypted_session_key.length);
 514                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 515                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 516                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 517                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 518                                      gensec_ntlmssp_state->encrypted_session_key.length);
 519                 }
 520         } else {
 521                 gensec_ntlmssp_state->session_key = session_key;
 522         }
 523
 524         /* keep the session key around on the new context */
 525         talloc_steal(gensec_ntlmssp_state, session_key.data);
 526
 527         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 528             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 529                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 530         } else {
 531                 nt_status = NT_STATUS_OK;
 532         }
 533
 534         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 535
 536         /* allow arbitarily many authentications, but watch that this will cause a
 537            memory leak, until the gensec_ntlmssp_state is shutdown
 538         */
 539
 540         if (gensec_ntlmssp_state->server_multiple_authentications) {
 541                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 542         } else {
 543                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 544         }
 545
 546         return nt_status;
 547 }
 548
 549
 550 /**
 551  * Next state function for the Authenticate packet
 552  *
 553  * @param gensec_security GENSEC state
 554  * @param out_mem_ctx Memory context for *out
 555  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 556  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 557  * @return Errors or NT_STATUS_OK if authentication sucessful
 558  */
 559
 560 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 561                              TALLOC_CTX *out_mem_ctx,
 562                              const DATA_BLOB in, DATA_BLOB *out)
 563 {
 564         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 565         DATA_BLOB user_session_key = data_blob(NULL, 0);
 566         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 567         NTSTATUS nt_status;
 568
 569         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
 570         if (!mem_ctx) {
 571                 return NT_STATUS_NO_MEMORY;
 572         }
 573
 574         /* zero the outbound NTLMSSP packet */
 575         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 576
 577         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 578                 talloc_free(mem_ctx);
 579                 return nt_status;
 580         }
 581
 582         /*
 583          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 584          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 585          * smb.conf file) and no NTLMv2 response was sent then the password check
 586          * will fail here. JRA.
 587          */
 588
 589         /* Finally, actually ask if the password is OK */
 590
 591         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
 592                                                                               &user_session_key, &lm_session_key))) {
 593                 talloc_free(mem_ctx);
 594                 return nt_status;
 595         }
 596
 597         if (gensec_security->want_features
 598             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
 599                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 600                 talloc_free(mem_ctx);
 601                 return nt_status;
 602         } else {
 603                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 604                 talloc_free(mem_ctx);
 605                 return NT_STATUS_OK;
 606         }
 607 }
 608
 609 /**
 610  * Return the challenge as determined by the authentication subsystem
 611  * @return an 8 byte random challenge
 612  */
 613
 614 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 615 {
 616         NTSTATUS status;
 617         const uint8_t *chal;
 618
 619         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 620         if (!NT_STATUS_IS_OK(status)) {
 621                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 622                         nt_errstr(status)));
 623                 return NULL;
 624         }
 625
 626         return chal;
 627 }
 628
 629 /**
 630  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 631  *
 632  * @return If the effective challenge used by the auth subsystem may be modified
 633  */
 634 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 635 {
 636         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 637 }
 638
 639 /**
 640  * NTLM2 authentication modifies the effective challenge,
 641  * @param challenge The new challenge value
 642  */
 643 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 644 {
 645         NTSTATUS nt_status;
 646         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 647         const uint8_t *chal;
 648
 649         if (challenge->length != 8) {
 650                 return NT_STATUS_INVALID_PARAMETER;
 651         }
 652
 653         chal = challenge->data;
 654
 655         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 656
 657         return nt_status;
 658 }
 659
 660 /**
 661  * Check the password on an NTLMSSP login.
 662  *
 663  * Return the session keys used on the connection.
 664  */
 665
 666 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 667                                             TALLOC_CTX *mem_ctx,
 668                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 669 {
 670         NTSTATUS nt_status;
 671         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
 672         if (!user_info) {
 673                 return NT_STATUS_NO_MEMORY;
 674         }
 675
 676         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 677         user_info->flags = 0;
 678         user_info->mapped_state = false;
 679         user_info->client.account_name = gensec_ntlmssp_state->user;
 680         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 681         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 682         user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
 683
 684         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 685         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 686         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 687         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 688         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 689
 690         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx,
 691                                         user_info, &gensec_ntlmssp_state->server_info);
 692         talloc_free(user_info);
 693         NT_STATUS_NOT_OK_RETURN(nt_status);
 694
 695         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
 696
 697         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 698                 DEBUG(10, ("Got NT session key of length %u\n",
 699                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 700                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
 701                         return NT_STATUS_NO_MEMORY;
 702                 }
 703
 704                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
 705         }
 706         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 707                 DEBUG(10, ("Got LM session key of length %u\n",
 708                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 709                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
 710                         return NT_STATUS_NO_MEMORY;
 711                 }
 712
 713                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
 714         }
 715         return nt_status;
 716 }
 717
 718 /**
 719  * Return the credentials of a logged on user, including session keys
 720  * etc.
 721  *
 722  * Only valid after a successful authentication
 723  *
 724  * May only be called once per authentication.
 725  *
 726  */
 727
 728 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 729                                      struct auth_session_info **session_info)
 730 {
 731         NTSTATUS nt_status;
 732         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 733
 734         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->lp_ctx, gensec_ntlmssp_state->server_info, session_info);
 735         NT_STATUS_NOT_OK_RETURN(nt_status);
 736
 737         (*session_info)->session_key = data_blob_talloc(*session_info,
 738                                                         gensec_ntlmssp_state->session_key.data,
 739                                                         gensec_ntlmssp_state->session_key.length);
 740
 741         return NT_STATUS_OK;
 742 }
 743
 744 /**
 745  * Start NTLMSSP on the server side
 746  *
 747  */
 748 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 749 {
 750         NTSTATUS nt_status;
 751         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 752
 753         nt_status = gensec_ntlmssp_start(gensec_security);
 754         NT_STATUS_NOT_OK_RETURN(nt_status);
 755
 756         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 757
 758         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 759
 760         gensec_ntlmssp_state->workstation = NULL;
 761         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->lp_ctx);
 762
 763         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->lp_ctx);
 764
 765         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 766
 767         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->lp_ctx)
 768                                           && lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "allow_lm_key", false));
 769
 770         gensec_ntlmssp_state->server_multiple_authentications = false;
 771
 772         gensec_ntlmssp_state->neg_flags =
 773                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
 774
 775         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 776         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 777         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 778
 779         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "128bit", true)) {
 780                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 781         }
 782
 783         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "56bit", true)) {
 784                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 785         }
 786
 787         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "keyexchange", true)) {
 788                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 789         }
 790
 791         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "alwayssign", true)) {
 792                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 793         }
 794
 795         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "ntlm2", true)) {
 796                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 797         }
 798
 799         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 800                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 801         }
 802         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 803                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 804         }
 805
 806         nt_status = auth_context_create(gensec_ntlmssp_state,
 807                                         gensec_security->event_ctx,
 808                                         gensec_security->msg_ctx,
 809                                         gensec_security->lp_ctx,
 810                                         &gensec_ntlmssp_state->auth_context);
 811         NT_STATUS_NOT_OK_RETURN(nt_status);
 812
 813         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 814         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 815         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 816         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 817         gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->lp_ctx);
 818
 819         return NT_STATUS_OK;
 820 }
 821