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/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
 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         dnsname[0] = '\0';
 183         if (gethostname(dnsname, sizeof(dnsname)) == -1) {
 184                 DEBUG(0,("gethostname failed\n"));
 185                 return NT_STATUS_UNSUCCESSFUL;
 186         }
 187
 188         /* This should be a 'netbios domain -> DNS domain' mapping */
 189         p = strchr(dnsname, '.');
 190         if (p != NULL) {
 191                 safe_strcpy(dnsdomname, p+1, sizeof(dnsdomname));
 192                 strlower_m(dnsdomname);
 193         } else {
 194                 dnsdomname[0] = '\0';
 195         }
 196
 197         /* This creates the 'blob' of names that appears at the end of the packet */
 198         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 199         {
 200                 const char *target_name_dns = "";
 201                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
 202                         target_name_dns = dnsdomname;
 203                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
 204                         target_name_dns = dnsname;
 205                 }
 206
 207                 msrpc_gen(out_mem_ctx,
 208                           lp_iconv_convenience(gensec_security->lp_ctx),
 209                           &struct_blob, "aaaaa",
 210                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 211                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
 212                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 213                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 214                           0, "");
 215         } else {
 216                 struct_blob = data_blob(NULL, 0);
 217         }
 218
 219         {
 220                 /* Marshel the packet in the right format, be it unicode or ASCII */
 221                 const char *gen_string;
 222                 if (gensec_ntlmssp_state->unicode) {
 223                         gen_string = "CdUdbddB";
 224                 } else {
 225                         gen_string = "CdAdbddB";
 226                 }
 227
 228                 msrpc_gen(out_mem_ctx,
 229                           lp_iconv_convenience(gensec_security->lp_ctx),
 230                           out, gen_string,
 231                           "NTLMSSP",
 232                           NTLMSSP_CHALLENGE,
 233                           target_name,
 234                           chal_flags,
 235                           cryptkey, 8,
 236                           0, 0,
 237                           struct_blob.data, struct_blob.length);
 238         }
 239
 240         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 241
 242         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 243 }
 244
 245 /**
 246  * Next state function for the Authenticate packet
 247  *
 248  * @param gensec_ntlmssp_state NTLMSSP State
 249  * @param request The request, as a DATA_BLOB
 250  * @return Errors or NT_STATUS_OK.
 251  */
 252
 253 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 254                                        const DATA_BLOB request)
 255 {
 256         uint32_t ntlmssp_command, auth_flags;
 257         NTSTATUS nt_status;
 258
 259         uint8_t session_nonce_hash[16];
 260
 261         const char *parse_string;
 262         char *domain = NULL;
 263         char *user = NULL;
 264         char *workstation = NULL;
 265
 266 #if 0
 267         file_save("ntlmssp_auth.dat", request.data, request.length);
 268 #endif
 269
 270         if (gensec_ntlmssp_state->unicode) {
 271                 parse_string = "CdBBUUUBd";
 272         } else {
 273                 parse_string = "CdBBAAABd";
 274         }
 275
 276         /* zero these out */
 277         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 278         data_blob_free(&gensec_ntlmssp_state->nt_resp);
 279         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 280
 281         gensec_ntlmssp_state->user = NULL;
 282         gensec_ntlmssp_state->domain = NULL;
 283         gensec_ntlmssp_state->workstation = NULL;
 284
 285         /* now the NTLMSSP encoded auth hashes */
 286         if (!msrpc_parse(gensec_ntlmssp_state,
 287                          lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
 288                          &request, parse_string,
 289                          "NTLMSSP",
 290                          &ntlmssp_command,
 291                          &gensec_ntlmssp_state->lm_resp,
 292                          &gensec_ntlmssp_state->nt_resp,
 293                          &domain,
 294                          &user,
 295                          &workstation,
 296                          &gensec_ntlmssp_state->encrypted_session_key,
 297                          &auth_flags)) {
 298                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 299                 dump_data(10, request.data, request.length);
 300
 301                 /* zero this out */
 302                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 303                 auth_flags = 0;
 304
 305                 /* Try again with a shorter string (Win9X truncates this packet) */
 306                 if (gensec_ntlmssp_state->unicode) {
 307                         parse_string = "CdBBUUU";
 308                 } else {
 309                         parse_string = "CdBBAAA";
 310                 }
 311
 312                 /* now the NTLMSSP encoded auth hashes */
 313                 if (!msrpc_parse(gensec_ntlmssp_state,
 314                                  lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
 315                                  &request, parse_string,
 316                                  "NTLMSSP",
 317                                  &ntlmssp_command,
 318                                  &gensec_ntlmssp_state->lm_resp,
 319                                  &gensec_ntlmssp_state->nt_resp,
 320                                  &domain,
 321                                  &user,
 322                                  &workstation)) {
 323                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 324                         dump_data(2, request.data, request.length);
 325
 326                         return NT_STATUS_INVALID_PARAMETER;
 327                 }
 328         }
 329
 330         if (auth_flags)
 331                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
 332
 333         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
 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_username(gensec_ntlmssp_state, user))) {
 340                 /* zero this out */
 341                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 342                 return nt_status;
 343         }
 344
 345         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
 346                 /* zero this out */
 347                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 348                 return nt_status;
 349         }
 350
 351         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 352                  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));
 353
 354 #if 0
 355         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
 356         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
 357 #endif
 358
 359         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 360            client challenge
 361
 362            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 363         */
 364         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 365                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
 366                         struct MD5Context md5_session_nonce_ctx;
 367                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
 368                                    && gensec_ntlmssp_state->internal_chal.length == 8);
 369
 370                         gensec_ntlmssp_state->doing_ntlm2 = true;
 371
 372                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
 373                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
 374
 375                         MD5Init(&md5_session_nonce_ctx);
 376                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 377                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 378
 379                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
 380                                                                session_nonce_hash, 8);
 381
 382                         /* LM response is no longer useful, zero it out */
 383                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
 384
 385                         /* We changed the effective challenge - set it */
 386                         if (!NT_STATUS_IS_OK(nt_status =
 387                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
 388                                                                                  &gensec_ntlmssp_state->chal))) {
 389                                 /* zero this out */
 390                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 391                                 return nt_status;
 392                         }
 393
 394                         /* LM Key is incompatible... */
 395                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 396                 }
 397         }
 398         return NT_STATUS_OK;
 399 }
 400
 401 /**
 402  * Next state function for the Authenticate packet
 403  * (after authentication - figures out the session keys etc)
 404  *
 405  * @param gensec_ntlmssp_state NTLMSSP State
 406  * @return Errors or NT_STATUS_OK.
 407  */
 408
 409 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 410                                         DATA_BLOB *user_session_key,
 411                                         DATA_BLOB *lm_session_key)
 412 {
 413         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 414         NTSTATUS nt_status;
 415         DATA_BLOB session_key = data_blob(NULL, 0);
 416
 417         if (user_session_key)
 418                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 419
 420         if (lm_session_key)
 421                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 422
 423         /* Handle the different session key derivation for NTLM2 */
 424         if (gensec_ntlmssp_state->doing_ntlm2) {
 425                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 426                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 427                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
 428                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 429                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 430                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 431
 432                 } else {
 433                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 434                         session_key = data_blob(NULL, 0);
 435                 }
 436         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 437                 /* Ensure we can never get here on NTLMv2 */
 438                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
 439
 440                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 441                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
 442                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 443                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
 444                                                           session_key.data);
 445                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 446                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 447                         } else {
 448
 449                                 /* When there is no LM response, just use zeros */
 450                                 static const uint8_t zeros[24];
 451                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
 452                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 453                                                           session_key.data);
 454                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 455                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 456                         }
 457                 } else {
 458                         /* LM Key not selected */
 459                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 460
 461                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 462                         session_key = data_blob(NULL, 0);
 463                 }
 464
 465         } else if (user_session_key && user_session_key->data) {
 466                 session_key = *user_session_key;
 467                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 468                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 469
 470                 /* LM Key not selected */
 471                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 472
 473         } else if (lm_session_key && lm_session_key->data) {
 474                 /* Very weird to have LM key, but no user session key, but anyway.. */
 475                 session_key = *lm_session_key;
 476                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 477                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 478
 479                 /* LM Key not selected */
 480                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 481
 482         } else {
 483                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 484                 session_key = data_blob(NULL, 0);
 485
 486                 /* LM Key not selected */
 487                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 488         }
 489
 490         /* With KEY_EXCH, the client supplies the proposed session key,
 491            but encrypts it with the long-term key */
 492         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 493                 if (!gensec_ntlmssp_state->encrypted_session_key.data
 494                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
 495                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 496                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 497                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
 498                         return NT_STATUS_INVALID_PARAMETER;
 499                 } else if (!session_key.data || session_key.length != 16) {
 500                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 501                                   (unsigned)session_key.length));
 502                         gensec_ntlmssp_state->session_key = session_key;
 503                 } else {
 504                         dump_data_pw("KEY_EXCH session key (enc):\n",
 505                                      gensec_ntlmssp_state->encrypted_session_key.data,
 506                                      gensec_ntlmssp_state->encrypted_session_key.length);
 507                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
 508                                       session_key.data,
 509                                       gensec_ntlmssp_state->encrypted_session_key.length);
 510                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
 511                                                                       gensec_ntlmssp_state->encrypted_session_key.data,
 512                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
 513                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
 514                                      gensec_ntlmssp_state->encrypted_session_key.length);
 515                 }
 516         } else {
 517                 gensec_ntlmssp_state->session_key = session_key;
 518         }
 519
 520         /* keep the session key around on the new context */
 521         talloc_steal(gensec_ntlmssp_state, session_key.data);
 522
 523         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 524             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 525                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
 526         } else {
 527                 nt_status = NT_STATUS_OK;
 528         }
 529
 530         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
 531
 532         /* allow arbitarily many authentications, but watch that this will cause a
 533            memory leak, until the gensec_ntlmssp_state is shutdown
 534         */
 535
 536         if (gensec_ntlmssp_state->server_multiple_authentications) {
 537                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
 538         } else {
 539                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
 540         }
 541
 542         return nt_status;
 543 }
 544
 545
 546 /**
 547  * Next state function for the Authenticate packet
 548  *
 549  * @param gensec_security GENSEC state
 550  * @param out_mem_ctx Memory context for *out
 551  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 552  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 553  * @return Errors or NT_STATUS_OK if authentication sucessful
 554  */
 555
 556 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 557                              TALLOC_CTX *out_mem_ctx,
 558                              const DATA_BLOB in, DATA_BLOB *out)
 559 {
 560         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 561         DATA_BLOB user_session_key = data_blob(NULL, 0);
 562         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 563         NTSTATUS nt_status;
 564
 565         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
 566         if (!mem_ctx) {
 567                 return NT_STATUS_NO_MEMORY;
 568         }
 569
 570         /* zero the outbound NTLMSSP packet */
 571         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
 572
 573         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
 574                 talloc_free(mem_ctx);
 575                 return nt_status;
 576         }
 577
 578         /*
 579          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 580          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 581          * smb.conf file) and no NTLMv2 response was sent then the password check
 582          * will fail here. JRA.
 583          */
 584
 585         /* Finally, actually ask if the password is OK */
 586
 587         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
 588                                                                               &user_session_key, &lm_session_key))) {
 589                 talloc_free(mem_ctx);
 590                 return nt_status;
 591         }
 592
 593         if (gensec_security->want_features
 594             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
 595                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
 596                 talloc_free(mem_ctx);
 597                 return nt_status;
 598         } else {
 599                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
 600                 talloc_free(mem_ctx);
 601                 return NT_STATUS_OK;
 602         }
 603 }
 604
 605 /**
 606  * Return the challenge as determined by the authentication subsystem
 607  * @return an 8 byte random challenge
 608  */
 609
 610 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 611 {
 612         NTSTATUS status;
 613         const uint8_t *chal;
 614
 615         status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
 616         if (!NT_STATUS_IS_OK(status)) {
 617                 return NULL;
 618         }
 619
 620         return chal;
 621 }
 622
 623 /**
 624  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 625  *
 626  * @return If the effective challenge used by the auth subsystem may be modified
 627  */
 628 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
 629 {
 630         return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
 631 }
 632
 633 /**
 634  * NTLM2 authentication modifies the effective challenge,
 635  * @param challenge The new challenge value
 636  */
 637 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
 638 {
 639         NTSTATUS nt_status;
 640         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
 641         const uint8_t *chal;
 642
 643         if (challenge->length != 8) {
 644                 return NT_STATUS_INVALID_PARAMETER;
 645         }
 646
 647         chal = challenge->data;
 648
 649         nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
 650
 651         return nt_status;
 652 }
 653
 654 /**
 655  * Check the password on an NTLMSSP login.
 656  *
 657  * Return the session keys used on the connection.
 658  */
 659
 660 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
 661                                             TALLOC_CTX *mem_ctx,
 662                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 663 {
 664         NTSTATUS nt_status;
 665         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
 666         if (!user_info) {
 667                 return NT_STATUS_NO_MEMORY;
 668         }
 669
 670         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 671         user_info->flags = 0;
 672         user_info->mapped_state = false;
 673         user_info->client.account_name = gensec_ntlmssp_state->user;
 674         user_info->client.domain_name = gensec_ntlmssp_state->domain;
 675         user_info->workstation_name = gensec_ntlmssp_state->workstation;
 676         user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
 677
 678         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 679         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
 680         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
 681         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
 682         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
 683
 684         nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx,
 685                                         user_info, &gensec_ntlmssp_state->server_info);
 686         talloc_free(user_info);
 687         NT_STATUS_NOT_OK_RETURN(nt_status);
 688
 689         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
 690
 691         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
 692                 DEBUG(10, ("Got NT session key of length %u\n",
 693                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
 694                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
 695                         return NT_STATUS_NO_MEMORY;
 696                 }
 697
 698                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
 699         }
 700         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
 701                 DEBUG(10, ("Got LM session key of length %u\n",
 702                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
 703                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
 704                         return NT_STATUS_NO_MEMORY;
 705                 }
 706
 707                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
 708         }
 709         return nt_status;
 710 }
 711
 712 /**
 713  * Return the credentials of a logged on user, including session keys
 714  * etc.
 715  *
 716  * Only valid after a successful authentication
 717  *
 718  * May only be called once per authentication.
 719  *
 720  */
 721
 722 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 723                                      struct auth_session_info **session_info)
 724 {
 725         NTSTATUS nt_status;
 726         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 727
 728         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->lp_ctx, gensec_ntlmssp_state->server_info, session_info);
 729         NT_STATUS_NOT_OK_RETURN(nt_status);
 730
 731         (*session_info)->session_key = data_blob_talloc(*session_info,
 732                                                         gensec_ntlmssp_state->session_key.data,
 733                                                         gensec_ntlmssp_state->session_key.length);
 734
 735         return NT_STATUS_OK;
 736 }
 737
 738 /**
 739  * Start NTLMSSP on the server side
 740  *
 741  */
 742 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 743 {
 744         NTSTATUS nt_status;
 745         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 746
 747         nt_status = gensec_ntlmssp_start(gensec_security);
 748         NT_STATUS_NOT_OK_RETURN(nt_status);
 749
 750         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
 751
 752         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
 753
 754         gensec_ntlmssp_state->workstation = NULL;
 755         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->lp_ctx);
 756
 757         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->lp_ctx);
 758
 759         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 760
 761         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->lp_ctx)
 762                                           && lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "allow_lm_key", false));
 763
 764         gensec_ntlmssp_state->server_multiple_authentications = false;
 765
 766         gensec_ntlmssp_state->neg_flags =
 767                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
 768
 769         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
 770         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
 771         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 772
 773         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "128bit", true)) {
 774                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 775         }
 776
 777         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "56bit", true)) {
 778                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 779         }
 780
 781         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "keyexchange", true)) {
 782                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 783         }
 784
 785         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "alwayssign", true)) {
 786                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 787         }
 788
 789         if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "ntlm2", true)) {
 790                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 791         }
 792
 793         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 794                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 795         }
 796         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 797                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 798         }
 799
 800         nt_status = auth_context_create(gensec_ntlmssp_state,
 801                                         gensec_security->event_ctx,
 802                                         gensec_security->msg_ctx,
 803                                         gensec_security->lp_ctx,
 804                                         &gensec_ntlmssp_state->auth_context);
 805         NT_STATUS_NOT_OK_RETURN(nt_status);
 806
 807         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 808         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 809         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 810         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
 811         gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->lp_ctx);
 812
 813         return NT_STATUS_OK;
 814 }
 815