source4/auth/gensec/gensec_gssapi.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Kerberos backend for GENSEC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  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 "lib/events/events.h"
  26 #include "system/kerberos.h"
  27 #include "auth/kerberos/kerberos.h"
  28 #include "librpc/gen_ndr/krb5pac.h"
  29 #include "auth/auth.h"
  30 #include "lib/ldb/include/ldb.h"
  31 #include "auth/auth_sam.h"
  32 #include "librpc/rpc/dcerpc.h"
  33 #include "auth/credentials/credentials.h"
  34 #include "auth/credentials/credentials_krb5.h"
  35 #include "auth/gensec/gensec.h"
  36 #include "auth/gensec/gensec_proto.h"
  37 #include "param/param.h"
  38 #include "auth/session_proto.h"
  39 #include <gssapi/gssapi.h>
  40 #include <gssapi/gssapi_krb5.h>
  41 #include <gssapi/gssapi_spnego.h>
  42 #include "auth/gensec/gensec_gssapi.h"
  43 #include "lib/util/util_net.h"
  44
  45 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  46 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  47
  48 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
  49                                  OM_uint32 maj_stat, OM_uint32 min_stat,
  50                                  const gss_OID mech)
  51 {
  52         OM_uint32 disp_min_stat, disp_maj_stat;
  53         gss_buffer_desc maj_error_message;
  54         gss_buffer_desc min_error_message;
  55         char *maj_error_string, *min_error_string;
  56         OM_uint32 msg_ctx = 0;
  57
  58         char *ret;
  59
  60         maj_error_message.value = NULL;
  61         min_error_message.value = NULL;
  62         maj_error_message.length = 0;
  63         min_error_message.length = 0;
  64
  65         disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
  66                            mech, &msg_ctx, &maj_error_message);
  67         disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
  68                            mech, &msg_ctx, &min_error_message);
  69
  70         maj_error_string = talloc_strndup(mem_ctx, (char *)maj_error_message.value, maj_error_message.length);
  71
  72         min_error_string = talloc_strndup(mem_ctx, (char *)min_error_message.value, min_error_message.length);
  73
  74         ret = talloc_asprintf(mem_ctx, "%s: %s", maj_error_string, min_error_string);
  75
  76         talloc_free(maj_error_string);
  77         talloc_free(min_error_string);
  78
  79         gss_release_buffer(&disp_min_stat, &maj_error_message);
  80         gss_release_buffer(&disp_min_stat, &min_error_message);
  81
  82         return ret;
  83 }
  84
  85
  86 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
  87 {
  88         OM_uint32 maj_stat, min_stat;
  89
  90         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
  91                 maj_stat = gss_release_cred(&min_stat,
  92                                             &gensec_gssapi_state->delegated_cred_handle);
  93         }
  94
  95         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
  96                 maj_stat = gss_delete_sec_context (&min_stat,
  97                                                    &gensec_gssapi_state->gssapi_context,
  98                                                    GSS_C_NO_BUFFER);
  99         }
 100
 101         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
 102                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
 103         }
 104         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
 105                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
 106         }
 107
 108         if (gensec_gssapi_state->lucid) {
 109                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 110         }
 111
 112         return 0;
 113 }
 114
 115 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
 116 {
 117         OM_uint32 maj_stat, min_stat;
 118
 119         if (gensec_gssapi_state->lucid) {
 120                 return NT_STATUS_OK;
 121         }
 122
 123         maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
 124                                                      &gensec_gssapi_state->gssapi_context,
 125                                                      1,
 126                                                      (void **)&gensec_gssapi_state->lucid);
 127         if (maj_stat != GSS_S_COMPLETE) {
 128                 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
 129                         gssapi_error_string(gensec_gssapi_state,
 130                                             maj_stat, min_stat,
 131                                             gensec_gssapi_state->gss_oid)));
 132                 return NT_STATUS_INTERNAL_ERROR;
 133         }
 134
 135         if (gensec_gssapi_state->lucid->version != 1) {
 136                 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
 137                         gensec_gssapi_state->lucid->version));
 138                 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
 139                 gensec_gssapi_state->lucid = NULL;
 140                 return NT_STATUS_INTERNAL_ERROR;
 141         }
 142
 143         return NT_STATUS_OK;
 144 }
 145
 146 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 147 {
 148         struct gensec_gssapi_state *gensec_gssapi_state;
 149         krb5_error_code ret;
 150         struct gsskrb5_send_to_kdc send_to_kdc;
 151         const char *realm;
 152
 153         gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
 154         if (!gensec_gssapi_state) {
 155                 return NT_STATUS_NO_MEMORY;
 156         }
 157
 158         gensec_gssapi_state->gss_exchange_count = 0;
 159         gensec_gssapi_state->max_wrap_buf_size
 160                 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
 161
 162         gensec_gssapi_state->sasl = false;
 163         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 164
 165         gensec_security->private_data = gensec_gssapi_state;
 166
 167         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 168         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 169         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 170         gensec_gssapi_state->lucid = NULL;
 171
 172         /* TODO: Fill in channel bindings */
 173         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 174
 175         gensec_gssapi_state->want_flags = 0;
 176         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
 177                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_POLICY_FLAG;
 178         }
 179         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
 180                 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
 181         }
 182         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
 183                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
 184         }
 185         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
 186                 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
 187         }
 188         if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
 189                 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
 190         }
 191
 192         gensec_gssapi_state->got_flags = 0;
 193
 194         gensec_gssapi_state->session_key = data_blob(NULL, 0);
 195         gensec_gssapi_state->pac = data_blob(NULL, 0);
 196
 197         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 198         gensec_gssapi_state->sig_size = 0;
 199
 200         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 201
 202         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 203                 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
 204         }
 205         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 206                 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
 207         }
 208         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 209                 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
 210         }
 211
 212         switch (gensec_security->ops->auth_type) {
 213         case DCERPC_AUTH_TYPE_SPNEGO:
 214                 gensec_gssapi_state->gss_oid = gss_mech_spnego;
 215                 break;
 216         case DCERPC_AUTH_TYPE_KRB5:
 217         default:
 218                 gensec_gssapi_state->gss_oid = gss_mech_krb5;
 219                 break;
 220         }
 221
 222         send_to_kdc.func = smb_krb5_send_and_recv_func;
 223         send_to_kdc.ptr = gensec_security->event_ctx;
 224
 225         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 226         if (ret) {
 227                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 228                 talloc_free(gensec_gssapi_state);
 229                 return NT_STATUS_INTERNAL_ERROR;
 230         }
 231
 232         realm = lp_realm(gensec_security->settings->lp_ctx);
 233         if (realm != NULL) {
 234                 ret = gsskrb5_set_default_realm(realm);
 235                 if (ret) {
 236                         DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
 237                         talloc_free(gensec_gssapi_state);
 238                         return NT_STATUS_INTERNAL_ERROR;
 239                 }
 240         }
 241
 242         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 243         ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
 244         if (ret) {
 245                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
 246                 talloc_free(gensec_gssapi_state);
 247                 return NT_STATUS_INTERNAL_ERROR;
 248         }
 249
 250         ret = smb_krb5_init_context(gensec_gssapi_state,
 251                                     gensec_security->event_ctx,
 252                                     gensec_security->settings->lp_ctx,
 253                                     &gensec_gssapi_state->smb_krb5_context);
 254         if (ret) {
 255                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 256                          error_message(ret)));
 257                 talloc_free(gensec_gssapi_state);
 258                 return NT_STATUS_INTERNAL_ERROR;
 259         }
 260         return NT_STATUS_OK;
 261 }
 262
 263 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 264 {
 265         NTSTATUS nt_status;
 266         int ret;
 267         struct gensec_gssapi_state *gensec_gssapi_state;
 268         struct cli_credentials *machine_account;
 269         struct gssapi_creds_container *gcc;
 270
 271         nt_status = gensec_gssapi_start(gensec_security);
 272         if (!NT_STATUS_IS_OK(nt_status)) {
 273                 return nt_status;
 274         }
 275
 276         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 277
 278         machine_account = gensec_get_credentials(gensec_security);
 279
 280         if (!machine_account) {
 281                 DEBUG(3, ("No machine account credentials specified\n"));
 282                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 283         } else {
 284                 ret = cli_credentials_get_server_gss_creds(machine_account,
 285                                                            gensec_security->event_ctx,
 286                                                            gensec_security->settings->lp_ctx, &gcc);
 287                 if (ret) {
 288                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 289                                   error_message(ret)));
 290                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 291                 }
 292         }
 293
 294         gensec_gssapi_state->server_cred = gcc;
 295         return NT_STATUS_OK;
 296
 297 }
 298
 299 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 300 {
 301         NTSTATUS nt_status;
 302         struct gensec_gssapi_state *gensec_gssapi_state;
 303         nt_status = gensec_gssapi_server_start(gensec_security);
 304
 305         if (NT_STATUS_IS_OK(nt_status)) {
 306                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 307                 gensec_gssapi_state->sasl = true;
 308         }
 309         return nt_status;
 310 }
 311
 312 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 313 {
 314         struct gensec_gssapi_state *gensec_gssapi_state;
 315         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 316         krb5_error_code ret;
 317         NTSTATUS nt_status;
 318         gss_buffer_desc name_token;
 319         gss_OID name_type;
 320         OM_uint32 maj_stat, min_stat;
 321         const char *hostname = gensec_get_target_hostname(gensec_security);
 322         const char *principal;
 323         struct gssapi_creds_container *gcc;
 324         const char *error_string;
 325
 326         if (!hostname) {
 327                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 328                 return NT_STATUS_INVALID_PARAMETER;
 329         }
 330         if (is_ipaddress(hostname)) {
 331                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 332                 return NT_STATUS_INVALID_PARAMETER;
 333         }
 334         if (strcmp(hostname, "localhost") == 0) {
 335                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 336                 return NT_STATUS_INVALID_PARAMETER;
 337         }
 338
 339         nt_status = gensec_gssapi_start(gensec_security);
 340         if (!NT_STATUS_IS_OK(nt_status)) {
 341                 return nt_status;
 342         }
 343
 344         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 345
 346         principal = gensec_get_target_principal(gensec_security);
 347         if (principal && lp_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
 348                 name_type = GSS_C_NULL_OID;
 349         } else {
 350                 principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
 351                                             gensec_get_target_service(gensec_security),
 352                                             hostname, lp_realm(gensec_security->settings->lp_ctx));
 353
 354                 name_type = GSS_C_NT_USER_NAME;
 355         }
 356         name_token.value  = discard_const_p(uint8_t, principal);
 357         name_token.length = strlen(principal);
 358
 359
 360         maj_stat = gss_import_name (&min_stat,
 361                                     &name_token,
 362                                     name_type,
 363                                     &gensec_gssapi_state->server_name);
 364         if (maj_stat) {
 365                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 366                           (char *)name_token.value,
 367                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 368                 return NT_STATUS_INVALID_PARAMETER;
 369         }
 370
 371         ret = cli_credentials_get_client_gss_creds(creds,
 372                                                    gensec_security->event_ctx,
 373                                                    gensec_security->settings->lp_ctx, &gcc, &error_string);
 374         switch (ret) {
 375         case 0:
 376                 break;
 377         case KRB5KDC_ERR_PREAUTH_FAILED:
 378                 return NT_STATUS_LOGON_FAILURE;
 379         case KRB5_KDC_UNREACH:
 380                 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", principal, error_string));
 381                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 382         default:
 383                 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
 384                 return NT_STATUS_UNSUCCESSFUL;
 385         }
 386
 387         gensec_gssapi_state->client_cred = gcc;
 388         if (!talloc_reference(gensec_gssapi_state, gcc)) {
 389                 return NT_STATUS_NO_MEMORY;
 390         }
 391
 392         return NT_STATUS_OK;
 393 }
 394
 395 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 396 {
 397         NTSTATUS nt_status;
 398         struct gensec_gssapi_state *gensec_gssapi_state;
 399         nt_status = gensec_gssapi_client_start(gensec_security);
 400
 401         if (NT_STATUS_IS_OK(nt_status)) {
 402                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 403                 gensec_gssapi_state->sasl = true;
 404         }
 405         return nt_status;
 406 }
 407
 408
 409 /**
 410  * Check if the packet is one for this mechansim
 411  *
 412  * @param gensec_security GENSEC state
 413  * @param in The request, as a DATA_BLOB
 414  * @return Error, INVALID_PARAMETER if it's not a packet for us
 415  *                or NT_STATUS_OK if the packet is ok.
 416  */
 417
 418 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 419                                     const DATA_BLOB *in)
 420 {
 421         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 422                 return NT_STATUS_OK;
 423         } else {
 424                 return NT_STATUS_INVALID_PARAMETER;
 425         }
 426 }
 427
 428
 429 /**
 430  * Next state function for the GSSAPI GENSEC mechanism
 431  *
 432  * @param gensec_gssapi_state GSSAPI State
 433  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 434  * @param in The request, as a DATA_BLOB
 435  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 436  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 437  *                or NT_STATUS_OK if the user is authenticated.
 438  */
 439
 440 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 441                                    TALLOC_CTX *out_mem_ctx,
 442                                    const DATA_BLOB in, DATA_BLOB *out)
 443 {
 444         struct gensec_gssapi_state *gensec_gssapi_state
 445                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 446         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 447         OM_uint32 maj_stat, min_stat;
 448         OM_uint32 min_stat2;
 449         gss_buffer_desc input_token, output_token;
 450         gss_OID gss_oid_p = NULL;
 451         input_token.length = in.length;
 452         input_token.value = in.data;
 453
 454         switch (gensec_gssapi_state->sasl_state) {
 455         case STAGE_GSS_NEG:
 456         {
 457                 switch (gensec_security->gensec_role) {
 458                 case GENSEC_CLIENT:
 459                 {
 460                         maj_stat = gss_init_sec_context(&min_stat,
 461                                                         gensec_gssapi_state->client_cred->creds,
 462                                                         &gensec_gssapi_state->gssapi_context,
 463                                                         gensec_gssapi_state->server_name,
 464                                                         gensec_gssapi_state->gss_oid,
 465                                                         gensec_gssapi_state->want_flags,
 466                                                         0,
 467                                                         gensec_gssapi_state->input_chan_bindings,
 468                                                         &input_token,
 469                                                         &gss_oid_p,
 470                                                         &output_token,
 471                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 472                                                         NULL);
 473                         if (gss_oid_p) {
 474                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 475                         }
 476                         break;
 477                 }
 478                 case GENSEC_SERVER:
 479                 {
 480                         maj_stat = gss_accept_sec_context(&min_stat,
 481                                                           &gensec_gssapi_state->gssapi_context,
 482                                                           gensec_gssapi_state->server_cred->creds,
 483                                                           &input_token,
 484                                                           gensec_gssapi_state->input_chan_bindings,
 485                                                           &gensec_gssapi_state->client_name,
 486                                                           &gss_oid_p,
 487                                                           &output_token,
 488                                                           &gensec_gssapi_state->got_flags,
 489                                                           NULL,
 490                                                           &gensec_gssapi_state->delegated_cred_handle);
 491                         if (gss_oid_p) {
 492                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 493                         }
 494                         break;
 495                 }
 496                 default:
 497                         return NT_STATUS_INVALID_PARAMETER;
 498
 499                 }
 500
 501                 gensec_gssapi_state->gss_exchange_count++;
 502
 503                 if (maj_stat == GSS_S_COMPLETE) {
 504                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 505                         gss_release_buffer(&min_stat2, &output_token);
 506
 507                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 508                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 509                         } else {
 510                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 511                         }
 512
 513                         /* We may have been invoked as SASL, so there
 514                          * is more work to do */
 515                         if (gensec_gssapi_state->sasl) {
 516                                 /* Due to a very subtle interaction
 517                                  * with SASL and the LDAP libs, we
 518                                  * must ensure the data pointer is
 519                                  * != NULL, but the length is 0.
 520                                  *
 521                                  * This ensures we send a 'zero
 522                                  * length' (rather than NULL) response
 523                                  */
 524
 525                                 if (!out->data) {
 526                                         out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
 527                                 }
 528
 529                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 530                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 531                         } else {
 532                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 533
 534                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 535                                         DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
 536                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 537                                         DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
 538                                 } else {
 539                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 540                                 }
 541
 542                                 return NT_STATUS_OK;
 543                         }
 544                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 545                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 546                         gss_release_buffer(&min_stat2, &output_token);
 547
 548                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 549                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 550                         switch (min_stat) {
 551                         case KRB5_KDC_UNREACH:
 552                                 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
 553                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 554                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 555                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 556                                 DEBUG(3, ("Server is not registered with our KDC: %s\n",
 557                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 558                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 559                         case KRB5KRB_AP_ERR_MSG_TYPE:
 560                                 /* garbage input, possibly from the auto-mech detection */
 561                                 return NT_STATUS_INVALID_PARAMETER;
 562                         default:
 563                                 DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
 564                                           gensec_gssapi_state->gss_exchange_count,
 565                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 566                                 return nt_status;
 567                         }
 568                 } else {
 569                         DEBUG(1, ("GSS Update(%d) failed: %s\n",
 570                                   gensec_gssapi_state->gss_exchange_count,
 571                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 572                         return nt_status;
 573                 }
 574                 break;
 575         }
 576
 577         /* These last two stages are only done if we were invoked as SASL */
 578         case STAGE_SASL_SSF_NEG:
 579         {
 580                 switch (gensec_security->gensec_role) {
 581                 case GENSEC_CLIENT:
 582                 {
 583                         uint8_t maxlength_proposed[4];
 584                         uint8_t maxlength_accepted[4];
 585                         uint8_t security_supported;
 586                         int conf_state;
 587                         gss_qop_t qop_state;
 588                         input_token.length = in.length;
 589                         input_token.value = in.data;
 590
 591                         /* As a client, we have just send a
 592                          * zero-length blob to the server (after the
 593                          * normal GSSAPI exchange), and it has replied
 594                          * with it's SASL negotiation */
 595
 596                         maj_stat = gss_unwrap(&min_stat,
 597                                               gensec_gssapi_state->gssapi_context,
 598                                               &input_token,
 599                                               &output_token,
 600                                               &conf_state,
 601                                               &qop_state);
 602                         if (GSS_ERROR(maj_stat)) {
 603                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 604                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 605                                 return NT_STATUS_ACCESS_DENIED;
 606                         }
 607
 608                         if (output_token.length < 4) {
 609                                 return NT_STATUS_INVALID_PARAMETER;
 610                         }
 611
 612                         memcpy(maxlength_proposed, output_token.value, 4);
 613                         gss_release_buffer(&min_stat, &output_token);
 614
 615                         /* first byte is the proposed security */
 616                         security_supported = maxlength_proposed[0];
 617                         maxlength_proposed[0] = '\0';
 618
 619                         /* Rest is the proposed max wrap length */
 620                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 621                                                                      gensec_gssapi_state->max_wrap_buf_size);
 622                         gensec_gssapi_state->sasl_protection = 0;
 623                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 624                                 if (security_supported & NEG_SEAL) {
 625                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 626                                 }
 627                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 628                                 if (security_supported & NEG_SIGN) {
 629                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 630                                 }
 631                         } else if (security_supported & NEG_NONE) {
 632                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 633                         } else {
 634                                 DEBUG(1, ("Remote server does not support unprotected connections"));
 635                                 return NT_STATUS_ACCESS_DENIED;
 636                         }
 637
 638                         /* Send back the negotiated max length */
 639
 640                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 641
 642                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 643
 644                         input_token.value = maxlength_accepted;
 645                         input_token.length = sizeof(maxlength_accepted);
 646
 647                         maj_stat = gss_wrap(&min_stat,
 648                                             gensec_gssapi_state->gssapi_context,
 649                                             false,
 650                                             GSS_C_QOP_DEFAULT,
 651                                             &input_token,
 652                                             &conf_state,
 653                                             &output_token);
 654                         if (GSS_ERROR(maj_stat)) {
 655                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 656                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 657                                 return NT_STATUS_ACCESS_DENIED;
 658                         }
 659
 660                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 661                         gss_release_buffer(&min_stat, &output_token);
 662
 663                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 664                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 665
 666                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 667                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
 668                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 669                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
 670                         } else {
 671                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
 672                         }
 673
 674                         return NT_STATUS_OK;
 675                 }
 676                 case GENSEC_SERVER:
 677                 {
 678                         uint8_t maxlength_proposed[4];
 679                         uint8_t security_supported = 0x0;
 680                         int conf_state;
 681
 682                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 683                         if (in.length != 0) {
 684                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 685                         }
 686
 687                         /* Give the client some idea what we will support */
 688
 689                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 690                         /* first byte is the proposed security */
 691                         maxlength_proposed[0] = '\0';
 692
 693                         gensec_gssapi_state->sasl_protection = 0;
 694                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 695                                 security_supported |= NEG_SEAL;
 696                         }
 697                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 698                                 security_supported |= NEG_SIGN;
 699                         }
 700                         if (security_supported == 0) {
 701                                 /* If we don't support anything, this must be 0 */
 702                                 RSIVAL(maxlength_proposed, 0, 0x0);
 703                         }
 704
 705                         /* TODO:  We may not wish to support this */
 706                         security_supported |= NEG_NONE;
 707                         maxlength_proposed[0] = security_supported;
 708
 709                         input_token.value = maxlength_proposed;
 710                         input_token.length = sizeof(maxlength_proposed);
 711
 712                         maj_stat = gss_wrap(&min_stat,
 713                                             gensec_gssapi_state->gssapi_context,
 714                                             false,
 715                                             GSS_C_QOP_DEFAULT,
 716                                             &input_token,
 717                                             &conf_state,
 718                                             &output_token);
 719                         if (GSS_ERROR(maj_stat)) {
 720                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 721                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 722                                 return NT_STATUS_ACCESS_DENIED;
 723                         }
 724
 725                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 726                         gss_release_buffer(&min_stat, &output_token);
 727
 728                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 729                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 730                 }
 731                 default:
 732                         return NT_STATUS_INVALID_PARAMETER;
 733
 734                 }
 735         }
 736         /* This is s server-only stage */
 737         case STAGE_SASL_SSF_ACCEPT:
 738         {
 739                 uint8_t maxlength_accepted[4];
 740                 uint8_t security_accepted;
 741                 int conf_state;
 742                 gss_qop_t qop_state;
 743                 input_token.length = in.length;
 744                 input_token.value = in.data;
 745
 746                 maj_stat = gss_unwrap(&min_stat,
 747                                       gensec_gssapi_state->gssapi_context,
 748                                       &input_token,
 749                                       &output_token,
 750                                       &conf_state,
 751                                       &qop_state);
 752                 if (GSS_ERROR(maj_stat)) {
 753                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 754                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 755                         return NT_STATUS_ACCESS_DENIED;
 756                 }
 757
 758                 if (output_token.length < 4) {
 759                         return NT_STATUS_INVALID_PARAMETER;
 760                 }
 761
 762                 memcpy(maxlength_accepted, output_token.value, 4);
 763                 gss_release_buffer(&min_stat, &output_token);
 764
 765                 /* first byte is the proposed security */
 766                 security_accepted = maxlength_accepted[0];
 767                 maxlength_accepted[0] = '\0';
 768
 769                 /* Rest is the proposed max wrap length */
 770                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 771                                                              gensec_gssapi_state->max_wrap_buf_size);
 772
 773                 gensec_gssapi_state->sasl_protection = 0;
 774                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 775                         if (security_accepted & NEG_SEAL) {
 776                                 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 777                         }
 778                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 779                         if (security_accepted & NEG_SIGN) {
 780                                 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 781                         }
 782                 } else if (security_accepted & NEG_NONE) {
 783                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 784                 } else {
 785                         DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
 786                         return NT_STATUS_ACCESS_DENIED;
 787                 }
 788
 789                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 790                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 791                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 792                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
 793                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 794                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
 795                 } else {
 796                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 797                 }
 798
 799                 *out = data_blob(NULL, 0);
 800                 return NT_STATUS_OK;
 801         }
 802         default:
 803                 return NT_STATUS_INVALID_PARAMETER;
 804         }
 805 }
 806
 807 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 808                                    TALLOC_CTX *mem_ctx,
 809                                    const DATA_BLOB *in,
 810                                    DATA_BLOB *out)
 811 {
 812         struct gensec_gssapi_state *gensec_gssapi_state
 813                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 814         OM_uint32 maj_stat, min_stat;
 815         gss_buffer_desc input_token, output_token;
 816         int conf_state;
 817         input_token.length = in->length;
 818         input_token.value = in->data;
 819
 820         maj_stat = gss_wrap(&min_stat,
 821                             gensec_gssapi_state->gssapi_context,
 822                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 823                             GSS_C_QOP_DEFAULT,
 824                             &input_token,
 825                             &conf_state,
 826                             &output_token);
 827         if (GSS_ERROR(maj_stat)) {
 828                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 829                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 830                 return NT_STATUS_ACCESS_DENIED;
 831         }
 832
 833         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 834         gss_release_buffer(&min_stat, &output_token);
 835
 836         if (gensec_gssapi_state->sasl) {
 837                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 838                 if (max_wrapped_size < out->length) {
 839                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 840                                   (unsigned)in->length,
 841                                   (unsigned)out->length,
 842                                   (unsigned int)max_wrapped_size));
 843                         return NT_STATUS_INVALID_PARAMETER;
 844                 }
 845         }
 846
 847         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 848             && !conf_state) {
 849                 return NT_STATUS_ACCESS_DENIED;
 850         }
 851         return NT_STATUS_OK;
 852 }
 853
 854 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 855                                      TALLOC_CTX *mem_ctx,
 856                                      const DATA_BLOB *in,
 857                                      DATA_BLOB *out)
 858 {
 859         struct gensec_gssapi_state *gensec_gssapi_state
 860                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 861         OM_uint32 maj_stat, min_stat;
 862         gss_buffer_desc input_token, output_token;
 863         int conf_state;
 864         gss_qop_t qop_state;
 865         input_token.length = in->length;
 866         input_token.value = in->data;
 867
 868         if (gensec_gssapi_state->sasl) {
 869                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 870                 if (max_wrapped_size < in->length) {
 871                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 872                         return NT_STATUS_INVALID_PARAMETER;
 873                 }
 874         }
 875
 876         maj_stat = gss_unwrap(&min_stat,
 877                               gensec_gssapi_state->gssapi_context,
 878                               &input_token,
 879                               &output_token,
 880                               &conf_state,
 881                               &qop_state);
 882         if (GSS_ERROR(maj_stat)) {
 883                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 884                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 885                 return NT_STATUS_ACCESS_DENIED;
 886         }
 887
 888         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 889         gss_release_buffer(&min_stat, &output_token);
 890
 891         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 892             && !conf_state) {
 893                 return NT_STATUS_ACCESS_DENIED;
 894         }
 895         return NT_STATUS_OK;
 896 }
 897
 898 /* Find out the maximum input size negotiated on this connection */
 899
 900 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 901 {
 902         struct gensec_gssapi_state *gensec_gssapi_state
 903                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 904         OM_uint32 maj_stat, min_stat;
 905         OM_uint32 max_input_size;
 906
 907         maj_stat = gss_wrap_size_limit(&min_stat,
 908                                        gensec_gssapi_state->gssapi_context,
 909                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 910                                        GSS_C_QOP_DEFAULT,
 911                                        gensec_gssapi_state->max_wrap_buf_size,
 912                                        &max_input_size);
 913         if (GSS_ERROR(maj_stat)) {
 914                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 915                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 916                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 917                 talloc_free(mem_ctx);
 918                 return 0;
 919         }
 920
 921         return max_input_size;
 922 }
 923
 924 /* Find out the maximum output size negotiated on this connection */
 925 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 926 {
 927         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 928         return gensec_gssapi_state->max_wrap_buf_size;
 929 }
 930
 931 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 932                                           TALLOC_CTX *mem_ctx,
 933                                           uint8_t *data, size_t length,
 934                                           const uint8_t *whole_pdu, size_t pdu_length,
 935                                           DATA_BLOB *sig)
 936 {
 937         struct gensec_gssapi_state *gensec_gssapi_state
 938                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 939         OM_uint32 maj_stat, min_stat;
 940         gss_buffer_desc input_token, output_token;
 941         int conf_state;
 942         ssize_t sig_length;
 943
 944         input_token.length = length;
 945         input_token.value = data;
 946
 947         maj_stat = gss_wrap(&min_stat,
 948                             gensec_gssapi_state->gssapi_context,
 949                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 950                             GSS_C_QOP_DEFAULT,
 951                             &input_token,
 952                             &conf_state,
 953                             &output_token);
 954         if (GSS_ERROR(maj_stat)) {
 955                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 956                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 957                 return NT_STATUS_ACCESS_DENIED;
 958         }
 959
 960         if (output_token.length < input_token.length) {
 961                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
 962                           (long)output_token.length, (long)length));
 963                 return NT_STATUS_INTERNAL_ERROR;
 964         }
 965         sig_length = output_token.length - input_token.length;
 966
 967         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
 968         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 969
 970         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 971         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
 972         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
 973
 974         gss_release_buffer(&min_stat, &output_token);
 975
 976         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 977             && !conf_state) {
 978                 return NT_STATUS_ACCESS_DENIED;
 979         }
 980         return NT_STATUS_OK;
 981 }
 982
 983 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
 984                                             TALLOC_CTX *mem_ctx,
 985                                             uint8_t *data, size_t length,
 986                                             const uint8_t *whole_pdu, size_t pdu_length,
 987                                             const DATA_BLOB *sig)
 988 {
 989         struct gensec_gssapi_state *gensec_gssapi_state
 990                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 991         OM_uint32 maj_stat, min_stat;
 992         gss_buffer_desc input_token, output_token;
 993         int conf_state;
 994         gss_qop_t qop_state;
 995         DATA_BLOB in;
 996
 997         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
 998
 999         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1000
1001         memcpy(in.data, sig->data, sig->length);
1002         memcpy(in.data + sig->length, data, length);
1003
1004         input_token.length = in.length;
1005         input_token.value = in.data;
1006
1007         maj_stat = gss_unwrap(&min_stat,
1008                               gensec_gssapi_state->gssapi_context,
1009                               &input_token,
1010                               &output_token,
1011                               &conf_state,
1012                               &qop_state);
1013         if (GSS_ERROR(maj_stat)) {
1014                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1015                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1016                 return NT_STATUS_ACCESS_DENIED;
1017         }
1018
1019         if (output_token.length != length) {
1020                 return NT_STATUS_INTERNAL_ERROR;
1021         }
1022
1023         memcpy(data, output_token.value, length);
1024
1025         gss_release_buffer(&min_stat, &output_token);
1026
1027         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1028             && !conf_state) {
1029                 return NT_STATUS_ACCESS_DENIED;
1030         }
1031         return NT_STATUS_OK;
1032 }
1033
1034 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1035                                           TALLOC_CTX *mem_ctx,
1036                                           const uint8_t *data, size_t length,
1037                                           const uint8_t *whole_pdu, size_t pdu_length,
1038                                           DATA_BLOB *sig)
1039 {
1040         struct gensec_gssapi_state *gensec_gssapi_state
1041                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1042         OM_uint32 maj_stat, min_stat;
1043         gss_buffer_desc input_token, output_token;
1044
1045         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1046                 input_token.length = pdu_length;
1047                 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1048         } else {
1049                 input_token.length = length;
1050                 input_token.value = discard_const_p(uint8_t *, data);
1051         }
1052
1053         maj_stat = gss_get_mic(&min_stat,
1054                             gensec_gssapi_state->gssapi_context,
1055                             GSS_C_QOP_DEFAULT,
1056                             &input_token,
1057                             &output_token);
1058         if (GSS_ERROR(maj_stat)) {
1059                 DEBUG(1, ("GSS GetMic failed: %s\n",
1060                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1061                 return NT_STATUS_ACCESS_DENIED;
1062         }
1063
1064         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1065
1066         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1067
1068         gss_release_buffer(&min_stat, &output_token);
1069
1070         return NT_STATUS_OK;
1071 }
1072
1073 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1074                                            TALLOC_CTX *mem_ctx,
1075                                            const uint8_t *data, size_t length,
1076                                            const uint8_t *whole_pdu, size_t pdu_length,
1077                                            const DATA_BLOB *sig)
1078 {
1079         struct gensec_gssapi_state *gensec_gssapi_state
1080                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1081         OM_uint32 maj_stat, min_stat;
1082         gss_buffer_desc input_token;
1083         gss_buffer_desc input_message;
1084         gss_qop_t qop_state;
1085
1086         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1087
1088         if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1089                 input_message.length = pdu_length;
1090                 input_message.value = discard_const(whole_pdu);
1091         } else {
1092                 input_message.length = length;
1093                 input_message.value = discard_const(data);
1094         }
1095
1096         input_token.length = sig->length;
1097         input_token.value = sig->data;
1098
1099         maj_stat = gss_verify_mic(&min_stat,
1100                               gensec_gssapi_state->gssapi_context,
1101                               &input_message,
1102                               &input_token,
1103                               &qop_state);
1104         if (GSS_ERROR(maj_stat)) {
1105                 DEBUG(1, ("GSS VerifyMic failed: %s\n",
1106                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1107                 return NT_STATUS_ACCESS_DENIED;
1108         }
1109
1110         return NT_STATUS_OK;
1111 }
1112
1113 /* Try to figure out what features we actually got on the connection */
1114 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1115                                        uint32_t feature)
1116 {
1117         struct gensec_gssapi_state *gensec_gssapi_state
1118                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1119         if (feature & GENSEC_FEATURE_SIGN) {
1120                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1121                 if (gensec_gssapi_state->sasl
1122                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1123                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1124                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1125                 }
1126                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1127         }
1128         if (feature & GENSEC_FEATURE_SEAL) {
1129                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1130                 if (gensec_gssapi_state->sasl
1131                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1132                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1133                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1134                 }
1135                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1136         }
1137         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1138                 /* Only for GSSAPI/Krb5 */
1139                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1140                         return true;
1141                 }
1142         }
1143         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1144                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1145         }
1146         if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1147                 NTSTATUS status;
1148
1149                 if (!(gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG)) {
1150                         return false;
1151                 }
1152
1153                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1154                         return true;
1155                 }
1156                 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1157                         return false;
1158                 }
1159
1160                 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1161                 if (!NT_STATUS_IS_OK(status)) {
1162                         return false;
1163                 }
1164
1165                 if (gensec_gssapi_state->lucid->protocol == 1) {
1166                         return true;
1167                 }
1168
1169                 return false;
1170         }
1171         /* We can always do async (rather than strict request/reply) packets.  */
1172         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1173                 return true;
1174         }
1175         return false;
1176 }
1177
1178 /*
1179  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1180  * (for encrypting some passwords).
1181  *
1182  * This breaks all the abstractions, but what do you expect...
1183  */
1184 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1185                                           DATA_BLOB *session_key)
1186 {
1187         struct gensec_gssapi_state *gensec_gssapi_state
1188                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1189         OM_uint32 maj_stat, min_stat;
1190         krb5_keyblock *subkey;
1191
1192         if (gensec_gssapi_state->sasl_state != STAGE_DONE) {
1193                 return NT_STATUS_NO_USER_SESSION_KEY;
1194         }
1195
1196         if (gensec_gssapi_state->session_key.data) {
1197                 *session_key = gensec_gssapi_state->session_key;
1198                 return NT_STATUS_OK;
1199         }
1200
1201         maj_stat = gsskrb5_get_subkey(&min_stat,
1202                                       gensec_gssapi_state->gssapi_context,
1203                                       &subkey);
1204         if (maj_stat != 0) {
1205                 DEBUG(1, ("NO session key for this mech\n"));
1206                 return NT_STATUS_NO_USER_SESSION_KEY;
1207         }
1208
1209         DEBUG(10, ("Got KRB5 session key of length %d%s\n",
1210                    (int)KRB5_KEY_LENGTH(subkey),
1211                    (gensec_gssapi_state->sasl_state == STAGE_DONE)?" (done)":""));
1212         *session_key = data_blob_talloc(gensec_gssapi_state,
1213                                         KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1214         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1215         gensec_gssapi_state->session_key = *session_key;
1216         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1217
1218         return NT_STATUS_OK;
1219 }
1220
1221 /* Get some basic (and authorization) information about the user on
1222  * this session.  This uses either the PAC (if present) or a local
1223  * database lookup */
1224 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1225                                            struct auth_session_info **_session_info)
1226 {
1227         NTSTATUS nt_status;
1228         TALLOC_CTX *mem_ctx;
1229         struct gensec_gssapi_state *gensec_gssapi_state
1230                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1231         struct auth_serversupplied_info *server_info = NULL;
1232         struct auth_session_info *session_info = NULL;
1233         OM_uint32 maj_stat, min_stat;
1234         gss_buffer_desc pac;
1235         DATA_BLOB pac_blob;
1236
1237         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1238             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1239                        gensec_gssapi_state->gss_oid->length) != 0)) {
1240                 DEBUG(1, ("NO session info available for this mech\n"));
1241                 return NT_STATUS_INVALID_PARAMETER;
1242         }
1243
1244         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1245         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1246
1247         maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1248                                                                gensec_gssapi_state->gssapi_context,
1249                                                                KRB5_AUTHDATA_WIN2K_PAC,
1250                                                                &pac);
1251
1252
1253         if (maj_stat == 0) {
1254                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1255                 gss_release_buffer(&min_stat, &pac);
1256
1257         } else {
1258                 pac_blob = data_blob(NULL, 0);
1259         }
1260
1261         /* IF we have the PAC - otherwise we need to get this
1262          * data from elsewere - local ldb, or (TODO) lookup of some
1263          * kind...
1264          */
1265         if (pac_blob.length) {
1266                 nt_status = kerberos_pac_blob_to_server_info(mem_ctx,
1267                                                              gensec_security->settings->iconv_convenience,
1268                                                              pac_blob,
1269                                                              gensec_gssapi_state->smb_krb5_context->krb5_context,
1270                                                              &server_info);
1271                 if (!NT_STATUS_IS_OK(nt_status)) {
1272                         talloc_free(mem_ctx);
1273                         return nt_status;
1274                 }
1275         } else {
1276                 gss_buffer_desc name_token;
1277                 char *principal_string;
1278
1279                 maj_stat = gss_display_name (&min_stat,
1280                                              gensec_gssapi_state->client_name,
1281                                              &name_token,
1282                                              NULL);
1283                 if (GSS_ERROR(maj_stat)) {
1284                         DEBUG(1, ("GSS display_name failed: %s\n",
1285                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1286                         talloc_free(mem_ctx);
1287                         return NT_STATUS_FOOBAR;
1288                 }
1289
1290                 principal_string = talloc_strndup(mem_ctx,
1291                                                   (const char *)name_token.value,
1292                                                   name_token.length);
1293
1294                 gss_release_buffer(&min_stat, &name_token);
1295
1296                 if (!principal_string) {
1297                         talloc_free(mem_ctx);
1298                         return NT_STATUS_NO_MEMORY;
1299                 }
1300
1301                 if (gensec_security->auth_context &&
1302                     !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
1303                         DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1304                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1305                         nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
1306                                                                                              gensec_security->auth_context,
1307                                                                                              principal_string,
1308                                                                                              &server_info);
1309
1310                         if (!NT_STATUS_IS_OK(nt_status)) {
1311                                 talloc_free(mem_ctx);
1312                                 return nt_status;
1313                         }
1314                 } else {
1315                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1316                                   principal_string,
1317                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1318                         return NT_STATUS_ACCESS_DENIED;
1319                 }
1320         }
1321
1322         /* references the server_info into the session_info */
1323         nt_status = gensec_generate_session_info(mem_ctx, gensec_security,
1324                                                  server_info, &session_info);
1325         if (!NT_STATUS_IS_OK(nt_status)) {
1326                 talloc_free(mem_ctx);
1327                 return nt_status;
1328         }
1329
1330         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1331         if (!NT_STATUS_IS_OK(nt_status)) {
1332                 talloc_free(mem_ctx);
1333                 return nt_status;
1334         }
1335
1336         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1337                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1338         } else {
1339                 krb5_error_code ret;
1340                 const char *error_string;
1341
1342                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1343                 session_info->credentials = cli_credentials_init(session_info);
1344                 if (!session_info->credentials) {
1345                         talloc_free(mem_ctx);
1346                         return NT_STATUS_NO_MEMORY;
1347                 }
1348
1349                 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1350                 /* Just so we don't segfault trying to get at a username */
1351                 cli_credentials_set_anonymous(session_info->credentials);
1352
1353                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1354                                                            gensec_security->event_ctx,
1355                                                            gensec_security->settings->lp_ctx,
1356                                                            gensec_gssapi_state->delegated_cred_handle,
1357                                                            CRED_SPECIFIED, &error_string);
1358                 if (ret) {
1359                         talloc_free(mem_ctx);
1360                         DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1361                         return NT_STATUS_NO_MEMORY;
1362                 }
1363
1364                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1365                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1366
1367                 /* It has been taken from this place... */
1368                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1369         }
1370         talloc_steal(gensec_gssapi_state, session_info);
1371         talloc_free(mem_ctx);
1372         *_session_info = session_info;
1373
1374         return NT_STATUS_OK;
1375 }
1376
1377 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1378 {
1379         struct gensec_gssapi_state *gensec_gssapi_state
1380                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1381         NTSTATUS status;
1382
1383         if (gensec_gssapi_state->sig_size) {
1384                 return gensec_gssapi_state->sig_size;
1385         }
1386
1387         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1388                 gensec_gssapi_state->sig_size = 45;
1389         } else {
1390                 gensec_gssapi_state->sig_size = 37;
1391         }
1392
1393         status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1394         if (!NT_STATUS_IS_OK(status)) {
1395                 return gensec_gssapi_state->sig_size;
1396         }
1397
1398         if (gensec_gssapi_state->lucid->protocol == 1) {
1399                 if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1400                         /*
1401                          * TODO: windows uses 76 here, but we don't know
1402                          *       gss_wrap works with aes keys yet
1403                          */
1404                         gensec_gssapi_state->sig_size = 76;
1405                 } else {
1406                         gensec_gssapi_state->sig_size = 28;
1407                 }
1408         } else if (gensec_gssapi_state->lucid->protocol == 0) {
1409                 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1410                 case KEYTYPE_DES:
1411                 case KEYTYPE_ARCFOUR:
1412                 case KEYTYPE_ARCFOUR_56:
1413                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1414                                 gensec_gssapi_state->sig_size = 45;
1415                         } else {
1416                                 gensec_gssapi_state->sig_size = 37;
1417                         }
1418                         break;
1419                 case KEYTYPE_DES3:
1420                         if (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG) {
1421                                 gensec_gssapi_state->sig_size = 57;
1422                         } else {
1423                                 gensec_gssapi_state->sig_size = 49;
1424                         }
1425                         break;
1426                 }
1427         }
1428
1429         return gensec_gssapi_state->sig_size;
1430 }
1431
1432 static const char *gensec_gssapi_krb5_oids[] = {
1433         GENSEC_OID_KERBEROS5_OLD,
1434         GENSEC_OID_KERBEROS5,
1435         NULL
1436 };
1437
1438 static const char *gensec_gssapi_spnego_oids[] = {
1439         GENSEC_OID_SPNEGO,
1440         NULL
1441 };
1442
1443 /* As a server, this could in theory accept any GSSAPI mech */
1444 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1445         .name           = "gssapi_spnego",
1446         .sasl_name      = "GSS-SPNEGO",
1447         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1448         .oid            = gensec_gssapi_spnego_oids,
1449         .client_start   = gensec_gssapi_client_start,
1450         .server_start   = gensec_gssapi_server_start,
1451         .magic          = gensec_gssapi_magic,
1452         .update         = gensec_gssapi_update,
1453         .session_key    = gensec_gssapi_session_key,
1454         .session_info   = gensec_gssapi_session_info,
1455         .sign_packet    = gensec_gssapi_sign_packet,
1456         .check_packet   = gensec_gssapi_check_packet,
1457         .seal_packet    = gensec_gssapi_seal_packet,
1458         .unseal_packet  = gensec_gssapi_unseal_packet,
1459         .wrap           = gensec_gssapi_wrap,
1460         .unwrap         = gensec_gssapi_unwrap,
1461         .have_feature   = gensec_gssapi_have_feature,
1462         .enabled        = false,
1463         .kerberos       = true,
1464         .priority       = GENSEC_GSSAPI
1465 };
1466
1467 /* As a server, this could in theory accept any GSSAPI mech */
1468 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1469         .name           = "gssapi_krb5",
1470         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1471         .oid            = gensec_gssapi_krb5_oids,
1472         .client_start   = gensec_gssapi_client_start,
1473         .server_start   = gensec_gssapi_server_start,
1474         .magic          = gensec_gssapi_magic,
1475         .update         = gensec_gssapi_update,
1476         .session_key    = gensec_gssapi_session_key,
1477         .session_info   = gensec_gssapi_session_info,
1478         .sig_size       = gensec_gssapi_sig_size,
1479         .sign_packet    = gensec_gssapi_sign_packet,
1480         .check_packet   = gensec_gssapi_check_packet,
1481         .seal_packet    = gensec_gssapi_seal_packet,
1482         .unseal_packet  = gensec_gssapi_unseal_packet,
1483         .wrap           = gensec_gssapi_wrap,
1484         .unwrap         = gensec_gssapi_unwrap,
1485         .have_feature   = gensec_gssapi_have_feature,
1486         .enabled        = true,
1487         .kerberos       = true,
1488         .priority       = GENSEC_GSSAPI
1489 };
1490
1491 /* As a server, this could in theory accept any GSSAPI mech */
1492 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1493         .name             = "gssapi_krb5_sasl",
1494         .sasl_name        = "GSSAPI",
1495         .client_start     = gensec_gssapi_sasl_client_start,
1496         .server_start     = gensec_gssapi_sasl_server_start,
1497         .update           = gensec_gssapi_update,
1498         .session_key      = gensec_gssapi_session_key,
1499         .session_info     = gensec_gssapi_session_info,
1500         .max_input_size   = gensec_gssapi_max_input_size,
1501         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1502         .wrap             = gensec_gssapi_wrap,
1503         .unwrap           = gensec_gssapi_unwrap,
1504         .have_feature     = gensec_gssapi_have_feature,
1505         .enabled          = true,
1506         .kerberos         = true,
1507         .priority         = GENSEC_GSSAPI
1508 };
1509
1510 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1511 {
1512         NTSTATUS ret;
1513
1514         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1515         if (!NT_STATUS_IS_OK(ret)) {
1516                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1517                         gensec_gssapi_spnego_security_ops.name));
1518                 return ret;
1519         }
1520
1521         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1522         if (!NT_STATUS_IS_OK(ret)) {
1523                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1524                         gensec_gssapi_krb5_security_ops.name));
1525                 return ret;
1526         }
1527
1528         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1529         if (!NT_STATUS_IS_OK(ret)) {
1530                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1531                         gensec_gssapi_sasl_krb5_security_ops.name));
1532                 return ret;
1533         }
1534
1535         return ret;
1536 }