source4/auth/kerberos/krb5_init_context.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Wrapper for krb5_init_context
   4
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher 2004
   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    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/kerberos.h"
  25 #include <tevent.h>
  26 #include "auth/kerberos/kerberos.h"
  27 #include "lib/socket/socket.h"
  28 #include "lib/stream/packet.h"
  29 #include "system/network.h"
  30 #include "param/param.h"
  31 #include "libcli/resolve/resolve.h"
  32 #include "../lib/tsocket/tsocket.h"
  33 #include "krb5_init_context.h"
  34 #ifdef SAMBA4_USES_HEIMDAL
  35 #include "../lib/dbwrap/dbwrap.h"
  36 #include "../lib/dbwrap/dbwrap_rbt.h"
  37 #include "../lib/util/util_tdb.h"
  38 #include <krb5/send_to_kdc_plugin.h>
  39 #endif
  40
  41 /*
  42   context structure for operations on cldap packets
  43 */
  44 struct smb_krb5_socket {
  45         struct socket_context *sock;
  46
  47         /* the fd event */
  48         struct tevent_fd *fde;
  49
  50         NTSTATUS status;
  51         DATA_BLOB request, reply;
  52
  53         struct packet_context *packet;
  54
  55         size_t partial_read;
  56 #ifdef SAMBA4_USES_HEIMDAL
  57         krb5_krbhst_info *hi;
  58 #endif
  59 };
  60
  61 static krb5_error_code smb_krb5_context_destroy(struct smb_krb5_context *ctx)
  62 {
  63 #ifdef SAMBA4_USES_HEIMDAL
  64         if (ctx->pvt_log_data) {
  65                 /* Otherwise krb5_free_context will try and close what we
  66                  * have already free()ed */
  67                 krb5_set_warn_dest(ctx->krb5_context, NULL);
  68                 krb5_closelog(ctx->krb5_context,
  69                                 (krb5_log_facility *)ctx->pvt_log_data);
  70         }
  71 #endif
  72         krb5_free_context(ctx->krb5_context);
  73         return 0;
  74 }
  75
  76 #ifdef SAMBA4_USES_HEIMDAL
  77 /* We never close down the DEBUG system, and no need to unreference the use */
  78 static void smb_krb5_debug_close(void *private_data) {
  79         return;
  80 }
  81 #endif
  82
  83 #ifdef SAMBA4_USES_HEIMDAL
  84 static void smb_krb5_debug_wrapper(
  85 #ifdef HAVE_KRB5_ADDLOG_FUNC_NEED_CONTEXT
  86                 krb5_context ctx,
  87 #endif /* HAVE_KRB5_ADDLOG_FUNC_NEED_CONTEXT */
  88                 const char *timestr, const char *msg, void *private_data)
  89 {
  90         DEBUGC(DBGC_KERBEROS, 3, ("Kerberos: %s\n", msg));
  91 }
  92 #endif
  93
  94 #ifdef SAMBA4_USES_HEIMDAL
  95 /*
  96   handle recv events on a smb_krb5 socket
  97 */
  98 static void smb_krb5_socket_recv(struct smb_krb5_socket *smb_krb5)
  99 {
 100         TALLOC_CTX *tmp_ctx = talloc_new(smb_krb5);
 101         DATA_BLOB blob;
 102         size_t nread, dsize;
 103
 104         smb_krb5->status = socket_pending(smb_krb5->sock, &dsize);
 105         if (!NT_STATUS_IS_OK(smb_krb5->status)) {
 106                 talloc_free(tmp_ctx);
 107                 return;
 108         }
 109
 110         blob = data_blob_talloc(tmp_ctx, NULL, dsize);
 111         if (blob.data == NULL && dsize != 0) {
 112                 smb_krb5->status = NT_STATUS_NO_MEMORY;
 113                 talloc_free(tmp_ctx);
 114                 return;
 115         }
 116
 117         smb_krb5->status = socket_recv(smb_krb5->sock, blob.data, blob.length, &nread);
 118         if (!NT_STATUS_IS_OK(smb_krb5->status)) {
 119                 talloc_free(tmp_ctx);
 120                 return;
 121         }
 122         blob.length = nread;
 123
 124         if (nread == 0) {
 125                 smb_krb5->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
 126                 talloc_free(tmp_ctx);
 127                 return;
 128         }
 129
 130         DEBUG(4,("Received smb_krb5 packet of length %d\n",
 131                  (int)blob.length));
 132
 133         talloc_steal(smb_krb5, blob.data);
 134         smb_krb5->reply = blob;
 135         talloc_free(tmp_ctx);
 136 }
 137
 138 static NTSTATUS smb_krb5_full_packet(void *private_data, DATA_BLOB data)
 139 {
 140         struct smb_krb5_socket *smb_krb5 = talloc_get_type(private_data, struct smb_krb5_socket);
 141         talloc_steal(smb_krb5, data.data);
 142         smb_krb5->reply = data;
 143         smb_krb5->reply.length -= 4;
 144         smb_krb5->reply.data += 4;
 145         return NT_STATUS_OK;
 146 }
 147
 148 /*
 149   handle request timeouts
 150 */
 151 static void smb_krb5_request_timeout(struct tevent_context *event_ctx,
 152                                   struct tevent_timer *te, struct timeval t,
 153                                   void *private_data)
 154 {
 155         struct smb_krb5_socket *smb_krb5 = talloc_get_type(private_data, struct smb_krb5_socket);
 156         DEBUG(5,("Timed out smb_krb5 packet\n"));
 157         smb_krb5->status = NT_STATUS_IO_TIMEOUT;
 158 }
 159
 160 static void smb_krb5_error_handler(void *private_data, NTSTATUS status)
 161 {
 162         struct smb_krb5_socket *smb_krb5 = talloc_get_type(private_data, struct smb_krb5_socket);
 163         smb_krb5->status = status;
 164 }
 165
 166 /*
 167   handle send events on a smb_krb5 socket
 168 */
 169 static void smb_krb5_socket_send(struct smb_krb5_socket *smb_krb5)
 170 {
 171         NTSTATUS status;
 172
 173         size_t len;
 174
 175         len = smb_krb5->request.length;
 176         status = socket_send(smb_krb5->sock, &smb_krb5->request, &len);
 177
 178         if (!NT_STATUS_IS_OK(status)) return;
 179
 180         TEVENT_FD_READABLE(smb_krb5->fde);
 181
 182         TEVENT_FD_NOT_WRITEABLE(smb_krb5->fde);
 183         return;
 184 }
 185
 186
 187 /*
 188   handle fd events on a smb_krb5_socket
 189 */
 190 static void smb_krb5_socket_handler(struct tevent_context *ev, struct tevent_fd *fde,
 191                                  uint16_t flags, void *private_data)
 192 {
 193         struct smb_krb5_socket *smb_krb5 = talloc_get_type(private_data, struct smb_krb5_socket);
 194         switch (smb_krb5->hi->proto) {
 195         case KRB5_KRBHST_UDP:
 196                 if (flags & TEVENT_FD_READ) {
 197                         smb_krb5_socket_recv(smb_krb5);
 198                         return;
 199                 }
 200                 if (flags & TEVENT_FD_WRITE) {
 201                         smb_krb5_socket_send(smb_krb5);
 202                         return;
 203                 }
 204                 /* not reached */
 205                 return;
 206         case KRB5_KRBHST_TCP:
 207                 if (flags & TEVENT_FD_READ) {
 208                         packet_recv(smb_krb5->packet);
 209                         return;
 210                 }
 211                 if (flags & TEVENT_FD_WRITE) {
 212                         packet_queue_run(smb_krb5->packet);
 213                         return;
 214                 }
 215                 /* not reached */
 216                 return;
 217         case KRB5_KRBHST_HTTP:
 218                 /* can't happen */
 219                 break;
 220         }
 221 }
 222
 223 static krb5_error_code smb_krb5_send_and_recv_func_int(struct smb_krb5_context *smb_krb5_context,
 224                                                        struct tevent_context *ev,
 225                                                        krb5_krbhst_info *hi,
 226                                                        struct addrinfo *ai,
 227                                                        smb_krb5_send_to_kdc_func func,
 228                                                        void *data,
 229                                                        time_t timeout,
 230                                                        const krb5_data *send_buf,
 231                                                        krb5_data *recv_buf)
 232 {
 233         krb5_error_code ret;
 234         NTSTATUS status;
 235         const char *name;
 236         struct addrinfo *a;
 237         struct smb_krb5_socket *smb_krb5;
 238
 239         DATA_BLOB send_blob;
 240
 241         TALLOC_CTX *frame = talloc_stackframe();
 242         if (frame == NULL) {
 243                 return ENOMEM;
 244         }
 245
 246         send_blob = data_blob_const(send_buf->data, send_buf->length);
 247
 248         for (a = ai; a; a = a->ai_next) {
 249                 struct socket_address *remote_addr;
 250                 smb_krb5 = talloc(frame, struct smb_krb5_socket);
 251                 if (!smb_krb5) {
 252                         TALLOC_FREE(frame);
 253                         return ENOMEM;
 254                 }
 255                 smb_krb5->hi = hi;
 256
 257                 switch (a->ai_family) {
 258                 case PF_INET:
 259                         name = "ipv4";
 260                         break;
 261 #ifdef HAVE_IPV6
 262                 case PF_INET6:
 263                         name = "ipv6";
 264                         break;
 265 #endif
 266                 default:
 267                         TALLOC_FREE(frame);
 268                         return EINVAL;
 269                 }
 270
 271                 status = NT_STATUS_INVALID_PARAMETER;
 272                 switch (hi->proto) {
 273                 case KRB5_KRBHST_UDP:
 274                         status = socket_create(smb_krb5, name,
 275                                                SOCKET_TYPE_DGRAM,
 276                                                &smb_krb5->sock, 0);
 277                         break;
 278                 case KRB5_KRBHST_TCP:
 279                         status = socket_create(smb_krb5, name,
 280                                                SOCKET_TYPE_STREAM,
 281                                                &smb_krb5->sock, 0);
 282                         break;
 283                 case KRB5_KRBHST_HTTP:
 284                         TALLOC_FREE(frame);
 285                         return EINVAL;
 286                 }
 287                 if (!NT_STATUS_IS_OK(status)) {
 288                         talloc_free(smb_krb5);
 289                         continue;
 290                 }
 291
 292                 remote_addr = socket_address_from_sockaddr(smb_krb5, a->ai_addr, a->ai_addrlen);
 293                 if (!remote_addr) {
 294                         talloc_free(smb_krb5);
 295                         continue;
 296                 }
 297
 298                 status = socket_connect_ev(smb_krb5->sock, NULL, remote_addr, 0, ev);
 299                 if (!NT_STATUS_IS_OK(status)) {
 300                         talloc_free(smb_krb5);
 301                         continue;
 302                 }
 303
 304                 /* Setup the FDE, start listening for read events
 305                  * from the start (otherwise we may miss a socket
 306                  * drop) and mark as AUTOCLOSE along with the fde */
 307
 308                 /* This is equivalent to EVENT_FD_READABLE(smb_krb5->fde) */
 309                 smb_krb5->fde = tevent_add_fd(ev, smb_krb5->sock,
 310                                               socket_get_fd(smb_krb5->sock),
 311                                               TEVENT_FD_READ,
 312                                               smb_krb5_socket_handler, smb_krb5);
 313                 /* its now the job of the event layer to close the socket */
 314                 tevent_fd_set_close_fn(smb_krb5->fde, socket_tevent_fd_close_fn);
 315                 socket_set_flags(smb_krb5->sock, SOCKET_FLAG_NOCLOSE);
 316
 317                 tevent_add_timer(ev, smb_krb5,
 318                                  timeval_current_ofs(timeout, 0),
 319                                  smb_krb5_request_timeout, smb_krb5);
 320
 321                 smb_krb5->status = NT_STATUS_OK;
 322                 smb_krb5->reply = data_blob(NULL, 0);
 323
 324                 switch (hi->proto) {
 325                 case KRB5_KRBHST_UDP:
 326                         TEVENT_FD_WRITEABLE(smb_krb5->fde);
 327                         smb_krb5->request = send_blob;
 328                         break;
 329                 case KRB5_KRBHST_TCP:
 330
 331                         smb_krb5->packet = packet_init(smb_krb5);
 332                         if (smb_krb5->packet == NULL) {
 333                                 talloc_free(smb_krb5);
 334                                 return ENOMEM;
 335                         }
 336                         packet_set_private(smb_krb5->packet, smb_krb5);
 337                         packet_set_socket(smb_krb5->packet, smb_krb5->sock);
 338                         packet_set_callback(smb_krb5->packet, smb_krb5_full_packet);
 339                         packet_set_full_request(smb_krb5->packet, packet_full_request_u32);
 340                         packet_set_error_handler(smb_krb5->packet, smb_krb5_error_handler);
 341                         packet_set_event_context(smb_krb5->packet, ev);
 342                         packet_set_fde(smb_krb5->packet, smb_krb5->fde);
 343
 344                         smb_krb5->request = data_blob_talloc(smb_krb5, NULL, send_blob.length + 4);
 345                         RSIVAL(smb_krb5->request.data, 0, send_blob.length);
 346                         memcpy(smb_krb5->request.data+4, send_blob.data, send_blob.length);
 347                         packet_send(smb_krb5->packet, smb_krb5->request);
 348                         break;
 349                 case KRB5_KRBHST_HTTP:
 350                         TALLOC_FREE(frame);
 351                         return EINVAL;
 352                 }
 353                 while ((NT_STATUS_IS_OK(smb_krb5->status)) && !smb_krb5->reply.length) {
 354                         if (tevent_loop_once(ev) != 0) {
 355                                 TALLOC_FREE(frame);
 356                                 return EINVAL;
 357                         }
 358
 359                         if (func) {
 360                                 /* After each and every event loop, reset the
 361                                  * send_to_kdc pointers to what they were when
 362                                  * we entered this loop.  That way, if a
 363                                  * nested event has invalidated them, we put
 364                                  * it back before we return to the heimdal
 365                                  * code */
 366                                 ret = smb_krb5_set_send_to_kdc_func(smb_krb5_context,
 367                                                                     NULL, /* send_to_realm */
 368                                                                     func,
 369                                                                     data);
 370                                 if (ret != 0) {
 371                                         TALLOC_FREE(frame);
 372                                         return ret;
 373                                 }
 374                         }
 375                 }
 376                 if (NT_STATUS_EQUAL(smb_krb5->status, NT_STATUS_IO_TIMEOUT)) {
 377                         talloc_free(smb_krb5);
 378                         continue;
 379                 }
 380
 381                 if (!NT_STATUS_IS_OK(smb_krb5->status)) {
 382                         struct tsocket_address *addr = socket_address_to_tsocket_address(smb_krb5, remote_addr);
 383                         const char *addr_string = NULL;
 384                         if (addr) {
 385                                 addr_string = tsocket_address_inet_addr_string(addr, smb_krb5);
 386                         } else {
 387                                 addr_string = NULL;
 388                         }
 389                         DEBUG(2,("Error reading smb_krb5 reply packet: %s from %s\n", nt_errstr(smb_krb5->status),
 390                                  addr_string));
 391                         talloc_free(smb_krb5);
 392                         continue;
 393                 }
 394
 395                 ret = krb5_data_copy(recv_buf, smb_krb5->reply.data, smb_krb5->reply.length);
 396                 if (ret) {
 397                         TALLOC_FREE(frame);
 398                         return ret;
 399                 }
 400                 talloc_free(smb_krb5);
 401
 402                 break;
 403         }
 404         TALLOC_FREE(frame);
 405         if (a) {
 406                 return 0;
 407         }
 408         return KRB5_KDC_UNREACH;
 409 }
 410
 411 krb5_error_code smb_krb5_send_and_recv_func(struct smb_krb5_context *smb_krb5_context,
 412                                             void *data,
 413                                             krb5_krbhst_info *hi,
 414                                             time_t timeout,
 415                                             const krb5_data *send_buf,
 416                                             krb5_data *recv_buf)
 417 {
 418         krb5_error_code ret;
 419         struct addrinfo *ai;
 420
 421         struct tevent_context *ev;
 422         TALLOC_CTX *frame = talloc_stackframe();
 423         if (frame == NULL) {
 424                 return ENOMEM;
 425         }
 426
 427         if (data == NULL) {
 428                 /* If no event context was available, then create one for this loop */
 429                 ev = samba_tevent_context_init(frame);
 430                 if (ev == NULL) {
 431                         TALLOC_FREE(frame);
 432                         return ENOMEM;
 433                 }
 434         } else {
 435                 ev = talloc_get_type_abort(data, struct tevent_context);
 436         }
 437
 438         ret = krb5_krbhst_get_addrinfo(smb_krb5_context->krb5_context, hi, &ai);
 439         if (ret) {
 440                 TALLOC_FREE(frame);
 441                 return ret;
 442         }
 443
 444         ret = smb_krb5_send_and_recv_func_int(smb_krb5_context,
 445                                               ev, hi, ai,
 446                                               smb_krb5_send_and_recv_func,
 447                                               data, timeout, send_buf, recv_buf);
 448         TALLOC_FREE(frame);
 449         return ret;
 450 }
 451
 452 krb5_error_code smb_krb5_send_and_recv_func_forced_tcp(struct smb_krb5_context *smb_krb5_context,
 453                                                        struct addrinfo *ai,
 454                                                        time_t timeout,
 455                                                        const krb5_data *send_buf,
 456                                                        krb5_data *recv_buf)
 457 {
 458         krb5_error_code k5ret;
 459         krb5_krbhst_info hi = {
 460                 .proto = KRB5_KRBHST_TCP,
 461         };
 462         struct tevent_context *ev;
 463         TALLOC_CTX *frame = talloc_stackframe();
 464         if (frame == NULL) {
 465                 return ENOMEM;
 466         }
 467
 468         /* no event context is passed in, create one for this loop */
 469         ev = samba_tevent_context_init(frame);
 470         if (ev == NULL) {
 471                 TALLOC_FREE(frame);
 472                 return ENOMEM;
 473         }
 474
 475         /* No need to pass in send_and_recv functions, we won't nest on this private event loop */
 476         k5ret = smb_krb5_send_and_recv_func_int(smb_krb5_context, ev, &hi, ai, NULL, NULL,
 477                                                 timeout, send_buf, recv_buf);
 478         TALLOC_FREE(frame);
 479         return k5ret;
 480 }
 481
 482 static struct db_context *smb_krb5_plugin_db;
 483
 484 struct smb_krb5_send_to_kdc_state {
 485         intptr_t key_ptr;
 486         struct smb_krb5_context *smb_krb5_context;
 487         smb_krb5_send_to_realm_func send_to_realm;
 488         smb_krb5_send_to_kdc_func send_to_kdc;
 489         void *private_data;
 490 };
 491
 492 static int smb_krb5_send_to_kdc_state_destructor(struct smb_krb5_send_to_kdc_state *state)
 493 {
 494         TDB_DATA key = make_tdb_data((uint8_t *)&state->key_ptr, sizeof(state->key_ptr));
 495         NTSTATUS status;
 496
 497         status = dbwrap_delete(smb_krb5_plugin_db, key);
 498         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 499                 status = NT_STATUS_OK;
 500         }
 501         if (!NT_STATUS_IS_OK(status)) {
 502                 return -1;
 503         }
 504
 505         state->smb_krb5_context = NULL;
 506         return 0;
 507 }
 508
 509 krb5_error_code smb_krb5_set_send_to_kdc_func(struct smb_krb5_context *smb_krb5_context,
 510                                               smb_krb5_send_to_realm_func send_to_realm,
 511                                               smb_krb5_send_to_kdc_func send_to_kdc,
 512                                               void *private_data)
 513 {
 514         intptr_t key_ptr = (intptr_t)smb_krb5_context->krb5_context;
 515         TDB_DATA key = make_tdb_data((uint8_t *)&key_ptr, sizeof(key_ptr));
 516         intptr_t value_ptr = (intptr_t)NULL;
 517         TDB_DATA value = make_tdb_data(NULL, 0);
 518         struct db_record *rec = NULL;
 519         struct smb_krb5_send_to_kdc_state *state = NULL;
 520         NTSTATUS status;
 521
 522         rec = dbwrap_fetch_locked(smb_krb5_plugin_db, smb_krb5_context, key);
 523         if (rec == NULL) {
 524                 return ENOMEM;
 525         }
 526
 527         value = dbwrap_record_get_value(rec);
 528         if (value.dsize != 0) {
 529                 SMB_ASSERT(value.dsize == sizeof(value_ptr));
 530                 memcpy(&value_ptr, value.dptr, sizeof(value_ptr));
 531                 state = talloc_get_type_abort((const void *)value_ptr,
 532                                               struct smb_krb5_send_to_kdc_state);
 533                 if (send_to_realm == NULL && send_to_kdc == NULL) {
 534                         status = dbwrap_record_delete(rec);
 535                         TALLOC_FREE(rec);
 536                         if (!NT_STATUS_IS_OK(status)) {
 537                                 return EINVAL;
 538                         }
 539                         return 0;
 540                 }
 541                 state->send_to_realm = send_to_realm;
 542                 state->send_to_kdc = send_to_kdc;
 543                 state->private_data = private_data;
 544                 TALLOC_FREE(rec);
 545                 return 0;
 546         }
 547
 548         if (send_to_kdc == NULL && send_to_realm == NULL) {
 549                 TALLOC_FREE(rec);
 550                 return 0;
 551         }
 552
 553         state = talloc_zero(smb_krb5_context,
 554                             struct smb_krb5_send_to_kdc_state);
 555         if (state == NULL) {
 556                 TALLOC_FREE(rec);
 557                 return ENOMEM;
 558         }
 559         state->key_ptr = key_ptr;
 560         state->smb_krb5_context = smb_krb5_context;
 561         state->send_to_realm = send_to_realm;
 562         state->send_to_kdc = send_to_kdc;
 563         state->private_data = private_data;
 564
 565         value_ptr = (intptr_t)state;
 566         value = make_tdb_data((uint8_t *)&value_ptr, sizeof(value_ptr));
 567
 568         status = dbwrap_record_store(rec, value, TDB_INSERT);
 569         TALLOC_FREE(rec);
 570         if (!NT_STATUS_IS_OK(status)) {
 571                 return EINVAL;
 572         }
 573         talloc_set_destructor(state, smb_krb5_send_to_kdc_state_destructor);
 574
 575         return 0;
 576 }
 577
 578 static krb5_error_code smb_krb5_plugin_init(krb5_context context, void **pctx)
 579 {
 580         *pctx = NULL;
 581         return 0;
 582 }
 583
 584 static void smb_krb5_plugin_fini(void *ctx)
 585 {
 586 }
 587
 588 static void smb_krb5_send_to_kdc_state_parser(TDB_DATA key, TDB_DATA value,
 589                                               void *private_data)
 590 {
 591         struct smb_krb5_send_to_kdc_state **state =
 592                 (struct smb_krb5_send_to_kdc_state **)private_data;
 593         intptr_t value_ptr;
 594
 595         SMB_ASSERT(value.dsize == sizeof(value_ptr));
 596         memcpy(&value_ptr, value.dptr, sizeof(value_ptr));
 597         *state = talloc_get_type_abort((const void *)value_ptr,
 598                                        struct smb_krb5_send_to_kdc_state);
 599 }
 600
 601 static struct smb_krb5_send_to_kdc_state *
 602 smb_krb5_send_to_kdc_get_state(krb5_context context)
 603 {
 604         intptr_t key_ptr = (intptr_t)context;
 605         TDB_DATA key = make_tdb_data((uint8_t *)&key_ptr, sizeof(key_ptr));
 606         struct smb_krb5_send_to_kdc_state *state = NULL;
 607         NTSTATUS status;
 608
 609         status = dbwrap_parse_record(smb_krb5_plugin_db, key,
 610                                      smb_krb5_send_to_kdc_state_parser,
 611                                      &state);
 612         if (!NT_STATUS_IS_OK(status)) {
 613                 return NULL;
 614         }
 615
 616         return state;
 617 }
 618
 619 static krb5_error_code smb_krb5_plugin_send_to_kdc(krb5_context context,
 620                                                    void *ctx,
 621                                                    krb5_krbhst_info *ho,
 622                                                    time_t timeout,
 623                                                    const krb5_data *in,
 624                                                    krb5_data *out)
 625 {
 626         struct smb_krb5_send_to_kdc_state *state = NULL;
 627
 628         state = smb_krb5_send_to_kdc_get_state(context);
 629         if (state == NULL) {
 630                 return KRB5_PLUGIN_NO_HANDLE;
 631         }
 632
 633         if (state->send_to_kdc == NULL) {
 634                 return KRB5_PLUGIN_NO_HANDLE;
 635         }
 636
 637         return state->send_to_kdc(state->smb_krb5_context,
 638                                   state->private_data,
 639                                   ho, timeout, in, out);
 640 }
 641
 642 static krb5_error_code smb_krb5_plugin_send_to_realm(krb5_context context,
 643                                                      void *ctx,
 644                                                      krb5_const_realm realm,
 645                                                      time_t timeout,
 646                                                      const krb5_data *in,
 647                                                      krb5_data *out)
 648 {
 649         struct smb_krb5_send_to_kdc_state *state = NULL;
 650
 651         state = smb_krb5_send_to_kdc_get_state(context);
 652         if (state == NULL) {
 653                 return KRB5_PLUGIN_NO_HANDLE;
 654         }
 655
 656         if (state->send_to_realm == NULL) {
 657                 return KRB5_PLUGIN_NO_HANDLE;
 658         }
 659
 660         return state->send_to_realm(state->smb_krb5_context,
 661                                     state->private_data,
 662                                     realm, timeout, in, out);
 663 }
 664
 665 static krb5plugin_send_to_kdc_ftable smb_krb5_plugin_ftable = {
 666         KRB5_PLUGIN_SEND_TO_KDC_VERSION_2,
 667         smb_krb5_plugin_init,
 668         smb_krb5_plugin_fini,
 669         smb_krb5_plugin_send_to_kdc,
 670         smb_krb5_plugin_send_to_realm
 671 };
 672 #endif
 673
 674 krb5_error_code
 675 smb_krb5_init_context_basic(TALLOC_CTX *tmp_ctx,
 676                             struct loadparm_context *lp_ctx,
 677                             krb5_context *_krb5_context)
 678 {
 679         krb5_error_code ret;
 680 #ifdef SAMBA4_USES_HEIMDAL
 681         char **config_files;
 682         const char *config_file, *realm;
 683 #endif
 684         krb5_context krb5_ctx;
 685
 686         ret = smb_krb5_init_context_common(&krb5_ctx);
 687         if (ret) {
 688                 return ret;
 689         }
 690
 691         /* The MIT Kerberos build relies on using the system krb5.conf file.
 692          * If you really want to use another file please set KRB5_CONFIG
 693          * accordingly. */
 694 #ifdef SAMBA4_USES_HEIMDAL
 695         config_file = lpcfg_config_path(tmp_ctx, lp_ctx, "krb5.conf");
 696         if (!config_file) {
 697                 krb5_free_context(krb5_ctx);
 698                 return ENOMEM;
 699         }
 700
 701         /* Use our local krb5.conf file by default */
 702         ret = krb5_prepend_config_files_default(config_file, &config_files);
 703         if (ret) {
 704                 DEBUG(1,("krb5_prepend_config_files_default failed (%s)\n",
 705                          smb_get_krb5_error_message(krb5_ctx, ret, tmp_ctx)));
 706                 krb5_free_context(krb5_ctx);
 707                 return ret;
 708         }
 709
 710         ret = krb5_set_config_files(krb5_ctx, config_files);
 711         krb5_free_config_files(config_files);
 712         if (ret) {
 713                 DEBUG(1,("krb5_set_config_files failed (%s)\n",
 714                          smb_get_krb5_error_message(krb5_ctx, ret, tmp_ctx)));
 715                 krb5_free_context(krb5_ctx);
 716                 return ret;
 717         }
 718
 719         /*
 720          * This is already called in smb_krb5_init_context_common(),
 721          * but krb5_set_config_files() may resets it.
 722          */
 723         krb5_set_dns_canonicalize_hostname(krb5_ctx, false);
 724
 725         realm = lpcfg_realm(lp_ctx);
 726         if (realm != NULL) {
 727                 ret = krb5_set_default_realm(krb5_ctx, realm);
 728                 if (ret) {
 729                         DEBUG(1,("krb5_set_default_realm failed (%s)\n",
 730                                  smb_get_krb5_error_message(krb5_ctx, ret, tmp_ctx)));
 731                         krb5_free_context(krb5_ctx);
 732                         return ret;
 733                 }
 734         }
 735
 736         if (smb_krb5_plugin_db == NULL) {
 737                 /*
 738                  * while krb5_plugin_register() takes a krb5_context,
 739                  * plugins are registered into a global list, so
 740                  * we only do that once
 741                  *
 742                  * We maintain a separate dispatch table for per
 743                  * krb5_context state.
 744                  */
 745                 ret = krb5_plugin_register(krb5_ctx, PLUGIN_TYPE_DATA,
 746                                      KRB5_PLUGIN_SEND_TO_KDC,
 747                                      &smb_krb5_plugin_ftable);
 748                 if (ret) {
 749                         DEBUG(1,("krb5_plugin_register(KRB5_PLUGIN_SEND_TO_KDC) failed (%s)\n",
 750                                  smb_get_krb5_error_message(krb5_ctx, ret, tmp_ctx)));
 751                         krb5_free_context(krb5_ctx);
 752                         return ret;
 753                 }
 754                 smb_krb5_plugin_db = db_open_rbt(NULL);
 755                 if (smb_krb5_plugin_db == NULL) {
 756                         DEBUG(1,("db_open_rbt() failed\n"));
 757                         krb5_free_context(krb5_ctx);
 758                         return ENOMEM;
 759                 }
 760         }
 761 #endif
 762         *_krb5_context = krb5_ctx;
 763         return 0;
 764 }
 765
 766 krb5_error_code smb_krb5_init_context(void *parent_ctx,
 767                                       struct loadparm_context *lp_ctx,
 768                                       struct smb_krb5_context **smb_krb5_context)
 769 {
 770         krb5_error_code ret;
 771         TALLOC_CTX *tmp_ctx;
 772         krb5_context kctx;
 773 #ifdef SAMBA4_USES_HEIMDAL
 774         krb5_log_facility *logf;
 775 #endif
 776
 777         tmp_ctx = talloc_new(parent_ctx);
 778         *smb_krb5_context = talloc_zero(tmp_ctx, struct smb_krb5_context);
 779
 780         if (!*smb_krb5_context || !tmp_ctx) {
 781                 talloc_free(tmp_ctx);
 782                 return ENOMEM;
 783         }
 784
 785         ret = smb_krb5_init_context_basic(tmp_ctx, lp_ctx, &kctx);
 786         if (ret) {
 787                 DEBUG(1,("smb_krb5_context_init_basic failed (%s)\n",
 788                          error_message(ret)));
 789                 talloc_free(tmp_ctx);
 790                 return ret;
 791         }
 792         (*smb_krb5_context)->krb5_context = kctx;
 793
 794         talloc_set_destructor(*smb_krb5_context, smb_krb5_context_destroy);
 795
 796 #ifdef SAMBA4_USES_HEIMDAL
 797         /* TODO: Should we have a different name here? */
 798         ret = krb5_initlog(kctx, "Samba", &logf);
 799
 800         if (ret) {
 801                 DEBUG(1,("krb5_initlog failed (%s)\n",
 802                          smb_get_krb5_error_message(kctx, ret, tmp_ctx)));
 803                 talloc_free(tmp_ctx);
 804                 return ret;
 805         }
 806         (*smb_krb5_context)->pvt_log_data = logf;
 807
 808         ret = krb5_addlog_func(kctx, logf, 0 /* min */, -1 /* max */,
 809                                smb_krb5_debug_wrapper,
 810                                 smb_krb5_debug_close, NULL);
 811         if (ret) {
 812                 DEBUG(1,("krb5_addlog_func failed (%s)\n",
 813                          smb_get_krb5_error_message(kctx, ret, tmp_ctx)));
 814                 talloc_free(tmp_ctx);
 815                 return ret;
 816         }
 817         krb5_set_warn_dest(kctx, logf);
 818 #endif
 819         talloc_steal(parent_ctx, *smb_krb5_context);
 820         talloc_free(tmp_ctx);
 821
 822         return 0;
 823 }
 824
 825 #ifdef SAMBA4_USES_HEIMDAL
 826 krb5_error_code smb_krb5_context_set_event_ctx(struct smb_krb5_context *smb_krb5_context,
 827                                                struct tevent_context *ev,
 828                                                struct tevent_context **previous_ev)
 829 {
 830         int ret;
 831         if (!ev) {
 832                 return EINVAL;
 833         }
 834
 835         *previous_ev = smb_krb5_context->current_ev;
 836
 837         smb_krb5_context->current_ev = talloc_reference(smb_krb5_context, ev);
 838         if (!smb_krb5_context->current_ev) {
 839                 return ENOMEM;
 840         }
 841
 842         /* Set use of our socket lib */
 843         ret = smb_krb5_set_send_to_kdc_func(smb_krb5_context,
 844                                             NULL, /* send_to_realm */
 845                                             smb_krb5_send_and_recv_func,
 846                                             ev);
 847         if (ret) {
 848                 TALLOC_CTX *tmp_ctx = talloc_new(NULL);
 849                 DEBUG(1,("smb_krb5_set_send_recv_func failed (%s)\n",
 850                          smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, tmp_ctx)));
 851                 talloc_free(tmp_ctx);
 852                 talloc_unlink(smb_krb5_context, smb_krb5_context->current_ev);
 853                 smb_krb5_context->current_ev = NULL;
 854                 return ret;
 855         }
 856         return 0;
 857 }
 858
 859 krb5_error_code smb_krb5_context_remove_event_ctx(struct smb_krb5_context *smb_krb5_context,
 860                                                   struct tevent_context *previous_ev,
 861                                                   struct tevent_context *ev)
 862 {
 863         int ret;
 864         talloc_unlink(smb_krb5_context, ev);
 865         /* If there was a mismatch with things happening on a stack, then don't wipe things */
 866         smb_krb5_context->current_ev = previous_ev;
 867         /* Set use of our socket lib */
 868         ret = smb_krb5_set_send_to_kdc_func(smb_krb5_context,
 869                                             NULL, /* send_to_realm */
 870                                             smb_krb5_send_and_recv_func,
 871                                             previous_ev);
 872         if (ret) {
 873                 TALLOC_CTX *tmp_ctx = talloc_new(NULL);
 874                 DEBUG(1,("smb_krb5_set_send_recv_func failed (%s)\n",
 875                          smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, tmp_ctx)));
 876                 talloc_free(tmp_ctx);
 877                 return ret;
 878         }
 879         return 0;
 880 }
 881 #endif