source3/smbd/seal.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB Transport encryption (sealing) code - server code.
   4    Copyright (C) Jeremy Allison 2007.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "smbd/smbd.h"
  22 #include "smbd/globals.h"
  23 #include "../libcli/auth/spnego.h"
  24 #include "../libcli/auth/ntlmssp.h"
  25 #include "ntlmssp_wrap.h"
  26 #include "smb_crypt.h"
  27 #include "../lib/util/asn1.h"
  28 #include "auth.h"
  29 #include "libsmb/libsmb.h"
  30 #include "../lib/tsocket/tsocket.h"
  31
  32 /******************************************************************************
  33  Server side encryption.
  34 ******************************************************************************/
  35
  36 /******************************************************************************
  37  Global server state.
  38 ******************************************************************************/
  39
  40 struct smb_srv_trans_enc_ctx {
  41         struct smb_trans_enc_state *es;
  42         struct auth_ntlmssp_state *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
  43 };
  44
  45 /******************************************************************************
  46  Return global enc context - this must change if we ever do multiple contexts.
  47 ******************************************************************************/
  48
  49 static uint16_t srv_enc_ctx(const struct smb_srv_trans_enc_ctx *ec)
  50 {
  51         return ec->es->enc_ctx_num;
  52 }
  53
  54 /******************************************************************************
  55  Is this an incoming encrypted packet ?
  56 ******************************************************************************/
  57
  58 bool is_encrypted_packet(struct smbd_server_connection *sconn,
  59                          const uint8_t *inbuf)
  60 {
  61         NTSTATUS status;
  62         uint16_t enc_num;
  63
  64         /* Ignore non-session messages or non 0xFF'E' messages. */
  65         if(CVAL(inbuf,0)
  66            || (smb_len(inbuf) < 8)
  67            || !(inbuf[4] == 0xFF && inbuf[5] == 'E')) {
  68                 return false;
  69         }
  70
  71         status = get_enc_ctx_num(inbuf, &enc_num);
  72         if (!NT_STATUS_IS_OK(status)) {
  73                 return false;
  74         }
  75
  76         /* Encrypted messages are 0xFF'E'<ctx> */
  77         if (srv_trans_enc_ctx && enc_num == srv_enc_ctx(srv_trans_enc_ctx)) {
  78                 return true;
  79         }
  80         return false;
  81 }
  82
  83 /******************************************************************************
  84  Create an auth_ntlmssp_state and ensure pointer copy is correct.
  85 ******************************************************************************/
  86
  87 static NTSTATUS make_auth_ntlmssp(const struct tsocket_address *remote_address,
  88                                   struct smb_srv_trans_enc_ctx *ec)
  89 {
  90         NTSTATUS status = auth_ntlmssp_prepare(remote_address,
  91                                              &ec->auth_ntlmssp_state);
  92         if (!NT_STATUS_IS_OK(status)) {
  93                 return nt_status_squash(status);
  94         }
  95
  96         auth_ntlmssp_want_feature(ec->auth_ntlmssp_state, NTLMSSP_FEATURE_SEAL);
  97
  98         status = auth_ntlmssp_start(ec->auth_ntlmssp_state);
  99
 100         if (!NT_STATUS_IS_OK(status)) {
 101                 return nt_status_squash(status);
 102         }
 103
 104         /*
 105          * We must remember to update the pointer copy for the common
 106          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
 107          */
 108         ec->es->s.auth_ntlmssp_state = ec->auth_ntlmssp_state;
 109         return status;
 110 }
 111
 112 /******************************************************************************
 113  Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
 114 ******************************************************************************/
 115
 116 static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
 117 {
 118         /*
 119          * We must remember to update the pointer copy for the common
 120          * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
 121          */
 122
 123         if (ec->auth_ntlmssp_state) {
 124                 TALLOC_FREE(ec->auth_ntlmssp_state);
 125                 /* The auth_ntlmssp_end killed this already. */
 126                 ec->es->s.auth_ntlmssp_state = NULL;
 127         }
 128 }
 129
 130 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 131
 132 /******************************************************************************
 133  Import a name.
 134 ******************************************************************************/
 135
 136 static NTSTATUS get_srv_gss_creds(const char *service,
 137                                 const char *name,
 138                                 gss_cred_usage_t cred_type,
 139                                 gss_cred_id_t *p_srv_cred)
 140 {
 141         OM_uint32 ret;
 142         OM_uint32 min;
 143         gss_name_t srv_name;
 144         gss_buffer_desc input_name;
 145         char *host_princ_s = NULL;
 146         NTSTATUS status = NT_STATUS_OK;
 147
 148         gss_OID_desc nt_hostbased_service =
 149         {10, discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
 150
 151         if (asprintf(&host_princ_s, "%s@%s", service, name) == -1) {
 152                 return NT_STATUS_NO_MEMORY;
 153         }
 154
 155         input_name.value = host_princ_s;
 156         input_name.length = strlen(host_princ_s) + 1;
 157
 158         ret = gss_import_name(&min,
 159                                 &input_name,
 160                                 &nt_hostbased_service,
 161                                 &srv_name);
 162
 163         DEBUG(10,("get_srv_gss_creds: imported name %s\n",
 164                 host_princ_s ));
 165
 166         if (ret != GSS_S_COMPLETE) {
 167                 SAFE_FREE(host_princ_s);
 168                 return map_nt_error_from_gss(ret, min);
 169         }
 170
 171         /*
 172          * We're accessing the krb5.keytab file here.
 173          * ensure we have permissions to do so.
 174          */
 175         become_root();
 176
 177         ret = gss_acquire_cred(&min,
 178                                 srv_name,
 179                                 GSS_C_INDEFINITE,
 180                                 GSS_C_NULL_OID_SET,
 181                                 cred_type,
 182                                 p_srv_cred,
 183                                 NULL,
 184                                 NULL);
 185         unbecome_root();
 186
 187         if (ret != GSS_S_COMPLETE) {
 188                 ADS_STATUS adss = ADS_ERROR_GSS(ret, min);
 189                 DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n",
 190                         ads_errstr(adss)));
 191                 status = map_nt_error_from_gss(ret, min);
 192         }
 193
 194         SAFE_FREE(host_princ_s);
 195         gss_release_name(&min, &srv_name);
 196         return status;
 197 }
 198
 199 /******************************************************************************
 200  Create a gss state.
 201  Try and get the cifs/server@realm principal first, then fall back to
 202  host/server@realm.
 203 ******************************************************************************/
 204
 205 static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
 206 {
 207         NTSTATUS status;
 208         gss_cred_id_t srv_cred;
 209         fstring fqdn;
 210
 211         name_to_fqdn(fqdn, lp_netbios_name());
 212         strlower_m(fqdn);
 213
 214         status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
 215         if (!NT_STATUS_IS_OK(status)) {
 216                 status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
 217                 if (!NT_STATUS_IS_OK(status)) {
 218                         return nt_status_squash(status);
 219                 }
 220         }
 221
 222         ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
 223         if (!ec->es->s.gss_state) {
 224                 OM_uint32 min;
 225                 gss_release_cred(&min, &srv_cred);
 226                 return NT_STATUS_NO_MEMORY;
 227         }
 228         ZERO_STRUCTP(ec->es->s.gss_state);
 229         ec->es->s.gss_state->creds = srv_cred;
 230
 231         /* No context yet. */
 232         ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
 233
 234         return NT_STATUS_OK;
 235 }
 236 #endif
 237
 238 /******************************************************************************
 239  Shutdown a server encryption context.
 240 ******************************************************************************/
 241
 242 static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
 243 {
 244         struct smb_srv_trans_enc_ctx *ec = *pp_ec;
 245
 246         if (!ec) {
 247                 return;
 248         }
 249
 250         if (ec->es) {
 251                 switch (ec->es->smb_enc_type) {
 252                         case SMB_TRANS_ENC_NTLM:
 253                                 destroy_auth_ntlmssp(ec);
 254                                 break;
 255 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 256                         case SMB_TRANS_ENC_GSS:
 257                                 break;
 258 #endif
 259                 }
 260                 common_free_encryption_state(&ec->es);
 261         }
 262
 263         SAFE_FREE(ec);
 264         *pp_ec = NULL;
 265 }
 266
 267 /******************************************************************************
 268  Create a server encryption context.
 269 ******************************************************************************/
 270
 271 static NTSTATUS make_srv_encryption_context(const struct tsocket_address *remote_address,
 272                                             enum smb_trans_enc_type smb_enc_type,
 273                                             struct smb_srv_trans_enc_ctx **pp_ec)
 274 {
 275         struct smb_srv_trans_enc_ctx *ec;
 276
 277         *pp_ec = NULL;
 278
 279         ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
 280         if (!ec) {
 281                 return NT_STATUS_NO_MEMORY;
 282         }
 283         ZERO_STRUCTP(partial_srv_trans_enc_ctx);
 284         ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
 285         if (!ec->es) {
 286                 SAFE_FREE(ec);
 287                 return NT_STATUS_NO_MEMORY;
 288         }
 289         ZERO_STRUCTP(ec->es);
 290         ec->es->smb_enc_type = smb_enc_type;
 291         switch (smb_enc_type) {
 292                 case SMB_TRANS_ENC_NTLM:
 293                         {
 294                                 NTSTATUS status = make_auth_ntlmssp(remote_address,
 295                                                                     ec);
 296                                 if (!NT_STATUS_IS_OK(status)) {
 297                                         srv_free_encryption_context(&ec);
 298                                         return status;
 299                                 }
 300                         }
 301                         break;
 302
 303 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 304                 case SMB_TRANS_ENC_GSS:
 305                         /* Acquire our credentials by calling gss_acquire_cred here. */
 306                         {
 307                                 NTSTATUS status = make_auth_gss(ec);
 308                                 if (!NT_STATUS_IS_OK(status)) {
 309                                         srv_free_encryption_context(&ec);
 310                                         return status;
 311                                 }
 312                         }
 313                         break;
 314 #endif
 315                 default:
 316                         srv_free_encryption_context(&ec);
 317                         return NT_STATUS_INVALID_PARAMETER;
 318         }
 319         *pp_ec = ec;
 320         return NT_STATUS_OK;
 321 }
 322
 323 /******************************************************************************
 324  Free an encryption-allocated buffer.
 325 ******************************************************************************/
 326
 327 void srv_free_enc_buffer(struct smbd_server_connection *sconn, char *buf)
 328 {
 329         /* We know this is an smb buffer, and we
 330          * didn't malloc, only copy, for a keepalive,
 331          * so ignore non-session messages. */
 332
 333         if(CVAL(buf,0)) {
 334                 return;
 335         }
 336
 337         if (srv_trans_enc_ctx) {
 338                 common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
 339         }
 340 }
 341
 342 /******************************************************************************
 343  Decrypt an incoming buffer.
 344 ******************************************************************************/
 345
 346 NTSTATUS srv_decrypt_buffer(char *buf)
 347 {
 348         /* Ignore non-session messages. */
 349         if(CVAL(buf,0)) {
 350                 return NT_STATUS_OK;
 351         }
 352
 353         if (srv_trans_enc_ctx) {
 354                 return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
 355         }
 356
 357         return NT_STATUS_OK;
 358 }
 359
 360 /******************************************************************************
 361  Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
 362 ******************************************************************************/
 363
 364 NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
 365 {
 366         *buf_out = buf;
 367
 368         /* Ignore non-session messages. */
 369         if(CVAL(buf,0)) {
 370                 return NT_STATUS_OK;
 371         }
 372
 373         if (srv_trans_enc_ctx) {
 374                 return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
 375         }
 376         /* Not encrypting. */
 377         return NT_STATUS_OK;
 378 }
 379
 380 /******************************************************************************
 381  Do the gss encryption negotiation. Parameters are in/out.
 382  Until success we do everything on the partial enc ctx.
 383 ******************************************************************************/
 384
 385 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 386 static NTSTATUS srv_enc_spnego_gss_negotiate(const struct tsocket_address *remote_address,
 387                                              unsigned char **ppdata,
 388                                              size_t *p_data_size,
 389                                              DATA_BLOB secblob)
 390 {
 391         OM_uint32 ret;
 392         OM_uint32 min;
 393         OM_uint32 flags = 0;
 394         gss_buffer_desc in_buf, out_buf;
 395         struct smb_tran_enc_state_gss *gss_state;
 396         DATA_BLOB auth_reply = data_blob_null;
 397         DATA_BLOB response = data_blob_null;
 398         NTSTATUS status;
 399
 400         if (!partial_srv_trans_enc_ctx) {
 401                 status = make_srv_encryption_context(remote_address,
 402                                                      SMB_TRANS_ENC_GSS,
 403                                                      &partial_srv_trans_enc_ctx);
 404                 if (!NT_STATUS_IS_OK(status)) {
 405                         return status;
 406                 }
 407         }
 408
 409         gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
 410
 411         in_buf.value = secblob.data;
 412         in_buf.length = secblob.length;
 413
 414         out_buf.value = NULL;
 415         out_buf.length = 0;
 416
 417         become_root();
 418
 419         ret = gss_accept_sec_context(&min,
 420                                 &gss_state->gss_ctx,
 421                                 gss_state->creds,
 422                                 &in_buf,
 423                                 GSS_C_NO_CHANNEL_BINDINGS,
 424                                 NULL,
 425                                 NULL,           /* Ignore oids. */
 426                                 &out_buf,       /* To return. */
 427                                 &flags,
 428                                 NULL,           /* Ingore time. */
 429                                 NULL);          /* Ignore delegated creds. */
 430         unbecome_root();
 431
 432         status = gss_err_to_ntstatus(ret, min);
 433         if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
 434                 return status;
 435         }
 436
 437         /* Ensure we've got sign+seal available. */
 438         if (ret == GSS_S_COMPLETE) {
 439                 if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
 440                                 (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
 441                         DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
 442                                 "for SMB sealing.\n"));
 443                         gss_release_buffer(&min, &out_buf);
 444                         return NT_STATUS_ACCESS_DENIED;
 445                 }
 446         }
 447
 448         auth_reply = data_blob(out_buf.value, out_buf.length);
 449         gss_release_buffer(&min, &out_buf);
 450
 451         /* Wrap in SPNEGO. */
 452         response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, OID_KERBEROS5);
 453         data_blob_free(&auth_reply);
 454
 455         SAFE_FREE(*ppdata);
 456         *ppdata = (unsigned char *)memdup(response.data, response.length);
 457         if ((*ppdata) == NULL && response.length > 0) {
 458                 status = NT_STATUS_NO_MEMORY;
 459         }
 460         *p_data_size = response.length;
 461
 462         data_blob_free(&response);
 463
 464         return status;
 465 }
 466 #endif
 467
 468 /******************************************************************************
 469  Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
 470  Until success we do everything on the partial enc ctx.
 471 ******************************************************************************/
 472
 473 static NTSTATUS srv_enc_ntlm_negotiate(const struct tsocket_address *remote_address,
 474                                        unsigned char **ppdata,
 475                                        size_t *p_data_size,
 476                                        DATA_BLOB secblob,
 477                                        bool spnego_wrap)
 478 {
 479         NTSTATUS status;
 480         DATA_BLOB chal = data_blob_null;
 481         DATA_BLOB response = data_blob_null;
 482
 483         status = make_srv_encryption_context(remote_address,
 484                                              SMB_TRANS_ENC_NTLM,
 485                                              &partial_srv_trans_enc_ctx);
 486         if (!NT_STATUS_IS_OK(status)) {
 487                 return status;
 488         }
 489
 490         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state,
 491                                      partial_srv_trans_enc_ctx->auth_ntlmssp_state,
 492                                      secblob, &chal);
 493
 494         /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
 495          * for success ... */
 496
 497         if (spnego_wrap) {
 498                 response = spnego_gen_auth_response(talloc_tos(), &chal, status, OID_NTLMSSP);
 499                 data_blob_free(&chal);
 500         } else {
 501                 /* Return the raw blob. */
 502                 response = chal;
 503         }
 504
 505         SAFE_FREE(*ppdata);
 506         *ppdata = (unsigned char *)memdup(response.data, response.length);
 507         if ((*ppdata) == NULL && response.length > 0) {
 508                 status = NT_STATUS_NO_MEMORY;
 509         }
 510         *p_data_size = response.length;
 511         data_blob_free(&response);
 512
 513         return status;
 514 }
 515
 516 /******************************************************************************
 517  Do the SPNEGO encryption negotiation. Parameters are in/out.
 518  Based off code in smbd/sesssionsetup.c
 519  Until success we do everything on the partial enc ctx.
 520 ******************************************************************************/
 521
 522 static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn,
 523                                         unsigned char **ppdata,
 524                                         size_t *p_data_size,
 525                                         unsigned char **pparam,
 526                                         size_t *p_param_size)
 527 {
 528         NTSTATUS status;
 529         DATA_BLOB blob = data_blob_null;
 530         DATA_BLOB secblob = data_blob_null;
 531         char *kerb_mech = NULL;
 532
 533         blob = data_blob_const(*ppdata, *p_data_size);
 534
 535         status = parse_spnego_mechanisms(talloc_tos(), blob, &secblob, &kerb_mech);
 536         if (!NT_STATUS_IS_OK(status)) {
 537                 return nt_status_squash(status);
 538         }
 539
 540         /* We should have no partial context at this point. */
 541
 542         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 543
 544         if (kerb_mech) {
 545                 TALLOC_FREE(kerb_mech);
 546
 547 #if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
 548                 status = srv_enc_spnego_gss_negotiate(conn->sconn->remote_address,
 549                                                       ppdata,
 550                                                       p_data_size,
 551                                                       secblob);
 552 #else
 553                 /* Currently we don't SPNEGO negotiate
 554                  * back to NTLMSSP as we do in sessionsetupX. We should... */
 555                 return NT_STATUS_LOGON_FAILURE;
 556 #endif
 557         } else {
 558                 status = srv_enc_ntlm_negotiate(conn->sconn->remote_address,
 559                                                 ppdata,
 560                                                 p_data_size,
 561                                                 secblob,
 562                                                 true);
 563         }
 564
 565         data_blob_free(&secblob);
 566
 567         if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 568                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 569                 return nt_status_squash(status);
 570         }
 571
 572         if (NT_STATUS_IS_OK(status)) {
 573                 /* Return the context we're using for this encryption state. */
 574                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 575                         return NT_STATUS_NO_MEMORY;
 576                 }
 577                 SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
 578                 *p_param_size = 2;
 579         }
 580
 581         return status;
 582 }
 583
 584 /******************************************************************************
 585  Complete a SPNEGO encryption negotiation. Parameters are in/out.
 586  We only get this for a NTLM auth second stage.
 587 ******************************************************************************/
 588
 589 static NTSTATUS srv_enc_spnego_ntlm_auth(connection_struct *conn,
 590                                         unsigned char **ppdata,
 591                                         size_t *p_data_size,
 592                                         unsigned char **pparam,
 593                                         size_t *p_param_size)
 594 {
 595         NTSTATUS status;
 596         DATA_BLOB blob = data_blob_null;
 597         DATA_BLOB auth = data_blob_null;
 598         DATA_BLOB auth_reply = data_blob_null;
 599         DATA_BLOB response = data_blob_null;
 600         struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
 601
 602         /* We must have a partial context here. */
 603
 604         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 605                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 606                 return NT_STATUS_INVALID_PARAMETER;
 607         }
 608
 609         blob = data_blob_const(*ppdata, *p_data_size);
 610         if (!spnego_parse_auth(talloc_tos(), blob, &auth)) {
 611                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 612                 return NT_STATUS_INVALID_PARAMETER;
 613         }
 614
 615         status = auth_ntlmssp_update(ec->auth_ntlmssp_state, talloc_tos(), auth, &auth_reply);
 616         data_blob_free(&auth);
 617
 618         /* From RFC4178.
 619          *
 620          *    supportedMech
 621          *
 622          *          This field SHALL only be present in the first reply from the
 623          *                target.
 624          * So set mechOID to NULL here.
 625          */
 626
 627         response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, NULL);
 628         data_blob_free(&auth_reply);
 629
 630         if (NT_STATUS_IS_OK(status)) {
 631                 /* Return the context we're using for this encryption state. */
 632                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 633                         return NT_STATUS_NO_MEMORY;
 634                 }
 635                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 636                 *p_param_size = 2;
 637         }
 638
 639         SAFE_FREE(*ppdata);
 640         *ppdata = (unsigned char *)memdup(response.data, response.length);
 641         if ((*ppdata) == NULL && response.length > 0)
 642                 return NT_STATUS_NO_MEMORY;
 643         *p_data_size = response.length;
 644         data_blob_free(&response);
 645         return status;
 646 }
 647
 648 /******************************************************************************
 649  Raw NTLM encryption negotiation. Parameters are in/out.
 650  This function does both steps.
 651 ******************************************************************************/
 652
 653 static NTSTATUS srv_enc_raw_ntlm_auth(connection_struct *conn,
 654                                         unsigned char **ppdata,
 655                                         size_t *p_data_size,
 656                                         unsigned char **pparam,
 657                                         size_t *p_param_size)
 658 {
 659         NTSTATUS status;
 660         DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
 661         DATA_BLOB response = data_blob_null;
 662         struct smb_srv_trans_enc_ctx *ec;
 663
 664         if (!partial_srv_trans_enc_ctx) {
 665                 /* This is the initial step. */
 666                 status = srv_enc_ntlm_negotiate(conn->sconn->remote_address,
 667                                                 ppdata,
 668                                                 p_data_size,
 669                                                 blob,
 670                                                 false);
 671                 if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
 672                         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 673                         return nt_status_squash(status);
 674                 }
 675                 return status;
 676         }
 677
 678         ec = partial_srv_trans_enc_ctx;
 679         if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
 680                 srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 681                 return NT_STATUS_INVALID_PARAMETER;
 682         }
 683
 684         /* Second step. */
 685         status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state,
 686                                      talloc_tos(),
 687                                      blob, &response);
 688
 689         if (NT_STATUS_IS_OK(status)) {
 690                 /* Return the context we're using for this encryption state. */
 691                 if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
 692                         return NT_STATUS_NO_MEMORY;
 693                 }
 694                 SSVAL(*pparam,0,ec->es->enc_ctx_num);
 695                 *p_param_size = 2;
 696         }
 697
 698         /* Return the raw blob. */
 699         SAFE_FREE(*ppdata);
 700         *ppdata = (unsigned char *)memdup(response.data, response.length);
 701         if ((*ppdata) == NULL && response.length > 0)
 702                 return NT_STATUS_NO_MEMORY;
 703         *p_data_size = response.length;
 704         data_blob_free(&response);
 705         return status;
 706 }
 707
 708 /******************************************************************************
 709  Do the SPNEGO encryption negotiation. Parameters are in/out.
 710 ******************************************************************************/
 711
 712 NTSTATUS srv_request_encryption_setup(connection_struct *conn,
 713                                         unsigned char **ppdata,
 714                                         size_t *p_data_size,
 715                                         unsigned char **pparam,
 716                                         size_t *p_param_size)
 717 {
 718         unsigned char *pdata = *ppdata;
 719
 720         SAFE_FREE(*pparam);
 721         *p_param_size = 0;
 722
 723         if (*p_data_size < 1) {
 724                 return NT_STATUS_INVALID_PARAMETER;
 725         }
 726
 727         if (pdata[0] == ASN1_APPLICATION(0)) {
 728                 /* its a negTokenTarg packet */
 729                 return srv_enc_spnego_negotiate(conn, ppdata, p_data_size, pparam, p_param_size);
 730         }
 731
 732         if (pdata[0] == ASN1_CONTEXT(1)) {
 733                 /* It's an auth packet */
 734                 return srv_enc_spnego_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 735         }
 736
 737         /* Maybe it's a raw unwrapped auth ? */
 738         if (*p_data_size < 7) {
 739                 return NT_STATUS_INVALID_PARAMETER;
 740         }
 741
 742         if (strncmp((char *)pdata, "NTLMSSP", 7) == 0) {
 743                 return srv_enc_raw_ntlm_auth(conn, ppdata, p_data_size, pparam, p_param_size);
 744         }
 745
 746         DEBUG(1,("srv_request_encryption_setup: Unknown packet\n"));
 747
 748         return NT_STATUS_LOGON_FAILURE;
 749 }
 750
 751 /******************************************************************************
 752  Negotiation was successful - turn on server-side encryption.
 753 ******************************************************************************/
 754
 755 static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
 756 {
 757         if (!ec || !ec->es) {
 758                 return NT_STATUS_LOGON_FAILURE;
 759         }
 760
 761         if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
 762                 if (!auth_ntlmssp_negotiated_sign((ec->auth_ntlmssp_state))) {
 763                         return NT_STATUS_INVALID_PARAMETER;
 764                 }
 765
 766                 if (!auth_ntlmssp_negotiated_seal((ec->auth_ntlmssp_state))) {
 767                         return NT_STATUS_INVALID_PARAMETER;
 768                 }
 769         }
 770         /* Todo - check gssapi case. */
 771
 772         return NT_STATUS_OK;
 773 }
 774
 775 /******************************************************************************
 776  Negotiation was successful - turn on server-side encryption.
 777 ******************************************************************************/
 778
 779 NTSTATUS srv_encryption_start(connection_struct *conn)
 780 {
 781         NTSTATUS status;
 782
 783         /* Check that we are really doing sign+seal. */
 784         status = check_enc_good(partial_srv_trans_enc_ctx);
 785         if (!NT_STATUS_IS_OK(status)) {
 786                 return status;
 787         }
 788         /* Throw away the context we're using currently (if any). */
 789         srv_free_encryption_context(&srv_trans_enc_ctx);
 790
 791         /* Steal the partial pointer. Deliberate shallow copy. */
 792         srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
 793         srv_trans_enc_ctx->es->enc_on = true;
 794
 795         partial_srv_trans_enc_ctx = NULL;
 796
 797         DEBUG(1,("srv_encryption_start: context negotiated\n"));
 798         return NT_STATUS_OK;
 799 }
 800
 801 /******************************************************************************
 802  Shutdown all server contexts.
 803 ******************************************************************************/
 804
 805 void server_encryption_shutdown(void)
 806 {
 807         srv_free_encryption_context(&partial_srv_trans_enc_ctx);
 808         srv_free_encryption_context(&srv_trans_enc_ctx);
 809 }