1 /* $NetBSD: ipropd_slave.c,v 1.4 2023/06/19 21:41:44 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2008 Kungliga Tekniska Hgskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "iprop.h" 37 38 __RCSID("$NetBSD: ipropd_slave.c,v 1.4 2023/06/19 21:41:44 christos Exp $"); 39 40 static const char *config_name = "ipropd-slave"; 41 42 static int verbose; 43 44 static krb5_log_facility *log_facility; 45 static char five_min[] = "5 min"; 46 static char *server_time_lost = five_min; 47 static int time_before_lost; 48 const char *slave_str = NULL; 49 50 static int 51 connect_to_master (krb5_context context, const char *master, 52 const char *port_str) 53 { 54 char port[NI_MAXSERV]; 55 struct addrinfo *ai, *a; 56 struct addrinfo hints; 57 int error; 58 int one = 1; 59 int s = -1; 60 61 memset(&hints, 0, sizeof(hints)); 62 hints.ai_socktype = SOCK_STREAM; 63 64 if (port_str == NULL) { 65 snprintf(port, sizeof(port), "%u", IPROP_PORT); 66 port_str = port; 67 } 68 69 error = getaddrinfo(master, port_str, &hints, &ai); 70 if (error) { 71 krb5_warnx(context, "Failed to get address of to %s: %s", 72 master, gai_strerror(error)); 73 return -1; 74 } 75 76 for (a = ai; a != NULL; a = a->ai_next) { 77 char node[NI_MAXHOST]; 78 error = getnameinfo(a->ai_addr, a->ai_addrlen, 79 node, sizeof(node), NULL, 0, NI_NUMERICHOST); 80 if (error) 81 strlcpy(node, "[unknown-addr]", sizeof(node)); 82 83 s = socket(a->ai_family, a->ai_socktype, a->ai_protocol); 84 if (s < 0) 85 continue; 86 if (connect(s, a->ai_addr, a->ai_addrlen) < 0) { 87 krb5_warn(context, errno, "connection failed to %s[%s]", 88 master, node); 89 close(s); 90 continue; 91 } 92 krb5_warnx(context, "connection successful " 93 "to master: %s[%s]", master, node); 94 break; 95 } 96 freeaddrinfo(ai); 97 98 if (a == NULL) 99 return -1; 100 101 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)) < 0) 102 krb5_warn(context, errno, "setsockopt(SO_KEEPALIVE) failed"); 103 104 /* 105 * We write message lengths separately from the payload, avoid Nagle 106 * delays. 107 */ 108 #if defined(IPPROTO_TCP) && defined(TCP_NODELAY) 109 (void) setsockopt(s, IPPROTO_TCP, TCP_NODELAY, 110 (void *)&one, sizeof(one)); 111 #endif 112 113 return s; 114 } 115 116 static void 117 get_creds(krb5_context context, const char *keytab_str, 118 krb5_ccache *cache, const char *serverhost) 119 { 120 krb5_keytab keytab; 121 krb5_principal client; 122 krb5_error_code ret; 123 krb5_get_init_creds_opt *init_opts; 124 krb5_creds creds; 125 char *server; 126 char keytab_buf[256]; 127 int aret; 128 129 if (keytab_str == NULL) { 130 ret = krb5_kt_default_name (context, keytab_buf, sizeof(keytab_buf)); 131 if (ret) 132 krb5_err (context, 1, ret, "krb5_kt_default_name"); 133 keytab_str = keytab_buf; 134 } 135 136 ret = krb5_kt_resolve(context, keytab_str, &keytab); 137 if(ret) 138 krb5_err(context, 1, ret, "%s", keytab_str); 139 140 141 ret = krb5_sname_to_principal (context, slave_str, IPROP_NAME, 142 KRB5_NT_SRV_HST, &client); 143 if (ret) krb5_err(context, 1, ret, "krb5_sname_to_principal"); 144 145 ret = krb5_get_init_creds_opt_alloc(context, &init_opts); 146 if (ret) krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc"); 147 148 aret = asprintf (&server, "%s/%s", IPROP_NAME, serverhost); 149 if (aret == -1 || server == NULL) 150 krb5_errx (context, 1, "malloc: no memory"); 151 152 ret = krb5_get_init_creds_keytab(context, &creds, client, keytab, 153 0, server, init_opts); 154 free (server); 155 krb5_get_init_creds_opt_free(context, init_opts); 156 if(ret) krb5_err(context, 1, ret, "krb5_get_init_creds"); 157 158 ret = krb5_kt_close(context, keytab); 159 if(ret) krb5_err(context, 1, ret, "krb5_kt_close"); 160 161 ret = krb5_cc_new_unique(context, krb5_cc_type_memory, NULL, cache); 162 if(ret) krb5_err(context, 1, ret, "krb5_cc_new_unique"); 163 164 ret = krb5_cc_initialize(context, *cache, creds.client); 165 if(ret) krb5_err(context, 1, ret, "krb5_cc_initialize"); 166 167 ret = krb5_cc_store_cred(context, *cache, &creds); 168 if(ret) krb5_err(context, 1, ret, "krb5_cc_store_cred"); 169 170 krb5_free_cred_contents(context, &creds); 171 krb5_free_principal(context, client); 172 } 173 174 static krb5_error_code 175 ihave(krb5_context context, krb5_auth_context auth_context, 176 int fd, uint32_t version) 177 { 178 int ret; 179 u_char buf[8]; 180 krb5_storage *sp; 181 krb5_data data; 182 183 sp = krb5_storage_from_mem(buf, 8); 184 ret = krb5_store_uint32(sp, I_HAVE); 185 if (ret == 0) 186 ret = krb5_store_uint32(sp, version); 187 krb5_storage_free(sp); 188 data.length = 8; 189 data.data = buf; 190 191 if (ret == 0) { 192 if (verbose) 193 krb5_warnx(context, "telling master we are at %u", version); 194 195 ret = krb5_write_priv_message(context, auth_context, &fd, &data); 196 if (ret) 197 krb5_warn(context, ret, "krb5_write_message"); 198 } 199 return ret; 200 } 201 202 #ifndef EDQUOT 203 /* There's no EDQUOT on WIN32, for example */ 204 #define EDQUOT ENOSPC 205 #endif 206 207 static int 208 append_to_log_file(krb5_context context, 209 kadm5_server_context *server_context, 210 krb5_storage *sp, off_t start, ssize_t slen) 211 { 212 size_t len; 213 ssize_t sret; 214 off_t log_off; 215 int ret, ret2; 216 void *buf; 217 218 if (verbose) 219 krb5_warnx(context, "appending diffs to log"); 220 221 if (slen == 0) 222 return 0; 223 if (slen < 0) 224 return EINVAL; 225 len = slen; 226 if (len != slen) 227 return EOVERFLOW; 228 229 buf = malloc(len); 230 if (buf == NULL && len != 0) { 231 krb5_warn(context, errno, "malloc: no memory"); 232 return ENOMEM; 233 } 234 235 if (krb5_storage_seek(sp, start, SEEK_SET) != start) { 236 krb5_errx(context, IPROPD_RESTART, 237 "krb5_storage_seek() failed"); /* can't happen */ 238 } 239 sret = krb5_storage_read(sp, buf, len); 240 if (sret < 0) 241 return errno; 242 if (len != (size_t)sret) { 243 /* Can't happen */ 244 krb5_errx(context, IPROPD_RESTART, 245 "short krb5_storage_read() from memory buffer"); 246 } 247 log_off = lseek(server_context->log_context.log_fd, 0, SEEK_CUR); 248 if (log_off == -1) 249 return errno; 250 251 /* 252 * Use net_write() so we get an errno if less that len bytes were 253 * written. 254 */ 255 sret = net_write(server_context->log_context.log_fd, buf, len); 256 free(buf); 257 if (sret != slen) 258 ret = errno; 259 else 260 ret = fsync(server_context->log_context.log_fd); 261 if (ret == 0) 262 return 0; 263 264 /* 265 * Attempt to recover from this. First, truncate the log file 266 * and reset the fd offset. Failure to do this -> unlink the 267 * log file and re-create it. Since we're the slave, we ought to be 268 * able to recover from the log being unlinked... 269 */ 270 if (ftruncate(server_context->log_context.log_fd, log_off) == -1 || 271 lseek(server_context->log_context.log_fd, log_off, SEEK_SET) == -1) { 272 (void) kadm5_log_end(server_context); 273 if (unlink(server_context->log_context.log_file) == -1) { 274 krb5_err(context, IPROPD_FATAL, errno, 275 "Failed to recover from failure to write log " 276 "entries from master to disk"); 277 } 278 ret2 = kadm5_log_init(server_context); 279 if (ret2) { 280 krb5_err(context, IPROPD_RESTART_SLOW, ret2, 281 "Failed to initialize log to recover from " 282 "failure to write log entries from master to disk"); 283 } 284 } 285 if (ret == ENOSPC || ret == EDQUOT || ret == EFBIG) { 286 /* Unlink the file in these cases. */ 287 krb5_warn(context, IPROPD_RESTART_SLOW, 288 "Failed to write log entries from master to disk"); 289 (void) kadm5_log_end(server_context); 290 if (unlink(server_context->log_context.log_file) == -1) { 291 krb5_err(context, IPROPD_FATAL, errno, 292 "Failed to recover from failure to write log " 293 "entries from master to disk"); 294 } 295 ret2 = kadm5_log_init(server_context); 296 if (ret2) { 297 krb5_err(context, IPROPD_RESTART_SLOW, ret2, 298 "Failed to initialize log to recover from " 299 "failure to write log entries from master to disk"); 300 } 301 return ret; 302 } 303 /* 304 * All other errors we treat as fatal here. This includes, for 305 * example, EIO and EPIPE (sorry, can't log to pipes nor sockets). 306 */ 307 krb5_err(context, IPROPD_FATAL, ret, 308 "Failed to write log entries from master to disk"); 309 } 310 311 static int 312 receive_loop (krb5_context context, 313 krb5_storage *sp, 314 kadm5_server_context *server_context) 315 { 316 int ret; 317 off_t left, right, off; 318 uint32_t len, vers; 319 320 if (verbose) 321 krb5_warnx(context, "receiving diffs"); 322 323 /* 324 * Seek to the first entry in the message from the master that is 325 * past the current version of the local database. 326 */ 327 do { 328 uint32_t timestamp; 329 uint32_t op; 330 331 if ((ret = krb5_ret_uint32(sp, &vers)) == HEIM_ERR_EOF) { 332 krb5_warnx(context, "master sent no new iprop entries"); 333 return 0; 334 } 335 336 /* 337 * TODO We could do more to validate the entries from the master 338 * here. And we could use/reuse more kadm5_log_*() code here. 339 * 340 * Alternatively we should trust that the master sent us exactly 341 * what we needed and just write this to the log file and let 342 * kadm5_log_recover() do the rest. 343 */ 344 if (ret || krb5_ret_uint32(sp, ×tamp) != 0 || 345 krb5_ret_uint32(sp, &op) != 0 || 346 krb5_ret_uint32(sp, &len) != 0) { 347 348 /* 349 * This shouldn't happen. Reconnecting probably won't help 350 * if it does happen, but by reconnecting we get a chance to 351 * connect to a new master if a new one is configured. 352 */ 353 krb5_warnx(context, "iprop entries from master were truncated"); 354 return EINVAL; 355 } 356 if (vers > server_context->log_context.version) { 357 break; 358 } 359 off = krb5_storage_seek(sp, 0, SEEK_CUR); 360 if (krb5_storage_seek(sp, len + 8, SEEK_CUR) != off + len + 8) { 361 krb5_warnx(context, "iprop entries from master were truncated"); 362 return EINVAL; 363 } 364 if (verbose) { 365 krb5_warnx(context, "diff contains old log record version " 366 "%u %lld %u length %u", 367 vers, (long long)timestamp, op, len); 368 } 369 } while(vers <= server_context->log_context.version); 370 371 /* 372 * Read the remaining entries into memory... 373 */ 374 /* SEEK_CUR is a header into the first entry we care about */ 375 left = krb5_storage_seek(sp, -16, SEEK_CUR); 376 right = krb5_storage_seek(sp, 0, SEEK_END); 377 if (right - left < 24 + len) { 378 krb5_warnx(context, "iprop entries from master were truncated"); 379 return EINVAL; 380 } 381 382 /* 383 * ...and then write them out to the on-disk log. 384 */ 385 386 ret = append_to_log_file(context, server_context, sp, left, right - left); 387 if (ret) 388 return ret; 389 390 /* 391 * Replay the new entries. 392 */ 393 if (verbose) 394 krb5_warnx(context, "replaying entries from master"); 395 ret = kadm5_log_recover(server_context, kadm_recover_replay); 396 if (ret) { 397 krb5_warn(context, ret, "replay failed"); 398 return ret; 399 } 400 401 ret = kadm5_log_get_version(server_context, &vers); 402 if (ret) { 403 krb5_warn(context, ret, 404 "could not get log version after applying diffs!"); 405 return ret; 406 } 407 if (verbose) 408 krb5_warnx(context, "slave at version %u", vers); 409 410 if (vers != server_context->log_context.version) { 411 krb5_warnx(context, "slave's log_context version (%u) is " 412 "inconsistent with log's version (%u)", 413 server_context->log_context.version, vers); 414 } 415 416 return 0; 417 } 418 419 static int 420 receive(krb5_context context, 421 krb5_storage *sp, 422 kadm5_server_context *server_context) 423 { 424 krb5_error_code ret, ret2; 425 426 ret = server_context->db->hdb_open(context, 427 server_context->db, 428 O_RDWR | O_CREAT, 0600); 429 if (ret) 430 krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->open"); 431 432 ret2 = receive_loop(context, sp, server_context); 433 if (ret2) 434 krb5_warn(context, ret2, "receive from ipropd-master had errors"); 435 436 ret = server_context->db->hdb_close(context, server_context->db); 437 if (ret) 438 krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->close"); 439 440 return ret2; 441 } 442 443 static void 444 send_im_here(krb5_context context, int fd, 445 krb5_auth_context auth_context) 446 { 447 krb5_storage *sp; 448 krb5_data data; 449 krb5_error_code ret; 450 451 ret = krb5_data_alloc(&data, 4); 452 if (ret) 453 krb5_err(context, IPROPD_RESTART, ret, "send_im_here"); 454 455 sp = krb5_storage_from_data (&data); 456 if (sp == NULL) 457 krb5_errx(context, IPROPD_RESTART, "krb5_storage_from_data"); 458 ret = krb5_store_uint32(sp, I_AM_HERE); 459 krb5_storage_free(sp); 460 461 if (ret == 0) { 462 ret = krb5_write_priv_message(context, auth_context, &fd, &data); 463 krb5_data_free(&data); 464 465 if (ret) 466 krb5_err(context, IPROPD_RESTART, ret, "krb5_write_priv_message"); 467 468 if (verbose) 469 krb5_warnx(context, "pinged master"); 470 } 471 472 return; 473 } 474 475 static void 476 reinit_log(krb5_context context, 477 kadm5_server_context *server_context, 478 uint32_t vno) 479 { 480 krb5_error_code ret; 481 482 if (verbose) 483 krb5_warnx(context, "truncating log on slave"); 484 485 ret = kadm5_log_reinit(server_context, vno); 486 if (ret) 487 krb5_err(context, IPROPD_RESTART_SLOW, ret, "kadm5_log_reinit"); 488 } 489 490 491 static krb5_error_code 492 receive_everything(krb5_context context, int fd, 493 kadm5_server_context *server_context, 494 krb5_auth_context auth_context) 495 { 496 int ret; 497 krb5_data data; 498 uint32_t vno = 0; 499 uint32_t opcode; 500 krb5_storage *sp; 501 502 char *dbname; 503 HDB *mydb; 504 505 krb5_warnx(context, "receive complete database"); 506 507 ret = asprintf(&dbname, "%s-NEW", server_context->db->hdb_name); 508 if (ret == -1) 509 krb5_err(context, IPROPD_RESTART, ENOMEM, "asprintf"); 510 ret = hdb_create(context, &mydb, dbname); 511 if(ret) 512 krb5_err(context, IPROPD_RESTART, ret, "hdb_create"); 513 free(dbname); 514 515 ret = hdb_set_master_keyfile(context, 516 mydb, server_context->config.stash_file); 517 if(ret) 518 krb5_err(context, IPROPD_RESTART, ret, "hdb_set_master_keyfile"); 519 520 /* I really want to use O_EXCL here, but given that I can't easily clean 521 up on error, I won't */ 522 ret = mydb->hdb_open(context, mydb, O_RDWR | O_CREAT | O_TRUNC, 0600); 523 if (ret) 524 krb5_err(context, IPROPD_RESTART, ret, "db->open"); 525 526 (void) mydb->hdb_set_sync(context, mydb, 0); 527 528 sp = NULL; 529 krb5_data_zero(&data); 530 do { 531 ret = krb5_read_priv_message(context, auth_context, &fd, &data); 532 533 if (ret) { 534 krb5_warn(context, ret, "krb5_read_priv_message"); 535 goto cleanup; 536 } 537 538 sp = krb5_storage_from_data(&data); 539 if (sp == NULL) 540 krb5_errx(context, IPROPD_RESTART, "krb5_storage_from_data"); 541 krb5_ret_uint32(sp, &opcode); 542 if (opcode == ONE_PRINC) { 543 krb5_data fake_data; 544 hdb_entry_ex entry; 545 546 krb5_storage_free(sp); 547 548 fake_data.data = (char *)data.data + 4; 549 fake_data.length = data.length - 4; 550 551 memset(&entry, 0, sizeof(entry)); 552 553 ret = hdb_value2entry(context, &fake_data, &entry.entry); 554 if (ret) 555 krb5_err(context, IPROPD_RESTART, ret, "hdb_value2entry"); 556 ret = mydb->hdb_store(server_context->context, 557 mydb, 558 0, &entry); 559 if (ret) 560 krb5_err(context, IPROPD_RESTART_SLOW, ret, "hdb_store"); 561 562 hdb_free_entry(context, &entry); 563 krb5_data_free(&data); 564 } else if (opcode == NOW_YOU_HAVE) 565 ; 566 else 567 krb5_errx(context, 1, "strange opcode %d", opcode); 568 } while (opcode == ONE_PRINC); 569 570 if (opcode != NOW_YOU_HAVE) 571 krb5_errx(context, IPROPD_RESTART_SLOW, 572 "receive_everything: strange %d", opcode); 573 574 krb5_ret_uint32(sp, &vno); 575 krb5_storage_free(sp); 576 577 reinit_log(context, server_context, vno); 578 579 ret = mydb->hdb_set_sync(context, mydb, 1); 580 if (ret) 581 krb5_err(context, IPROPD_RESTART_SLOW, ret, "failed to sync the received HDB"); 582 ret = mydb->hdb_close(context, mydb); 583 if (ret) 584 krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->close"); 585 586 ret = mydb->hdb_rename(context, mydb, server_context->db->hdb_name); 587 if (ret) 588 krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->rename"); 589 590 591 return 0; 592 593 cleanup: 594 krb5_data_free(&data); 595 596 if (ret) 597 krb5_err(context, IPROPD_RESTART_SLOW, ret, "db->close"); 598 599 ret = mydb->hdb_destroy(context, mydb); 600 if (ret) 601 krb5_err(context, IPROPD_RESTART, ret, "db->destroy"); 602 603 krb5_warnx(context, "receive complete database, version %ld", (long)vno); 604 return ret; 605 } 606 607 static void 608 slave_status(krb5_context context, 609 const char *file, 610 const char *status, ...) 611 __attribute__ ((__format__ (__printf__, 3, 4))); 612 613 614 static void 615 slave_status(krb5_context context, 616 const char *file, 617 const char *fmt, ...) 618 { 619 char *status; 620 char *fmt2; 621 va_list args; 622 int len; 623 624 if (asprintf(&fmt2, "%s\n", fmt) == -1 || fmt2 == NULL) { 625 (void) unlink(file); 626 return; 627 } 628 va_start(args, fmt); 629 len = vasprintf(&status, fmt2, args); 630 free(fmt2); 631 va_end(args); 632 if (len < 0 || status == NULL) { 633 (void) unlink(file); 634 return; 635 } 636 krb5_warnx(context, "slave status change: %s", status); 637 638 rk_dumpdata(file, status, len); 639 free(status); 640 } 641 642 static void 643 is_up_to_date(krb5_context context, const char *file, 644 kadm5_server_context *server_context) 645 { 646 krb5_error_code ret; 647 char buf[80]; 648 ret = krb5_format_time(context, time(NULL), buf, sizeof(buf), 1); 649 if (ret) { 650 unlink(file); 651 return; 652 } 653 slave_status(context, file, "up-to-date with version: %lu at %s", 654 (unsigned long)server_context->log_context.version, buf); 655 } 656 657 static char *status_file; 658 static char *config_file; 659 static char *realm; 660 static int version_flag; 661 static int help_flag; 662 static char *keytab_str; 663 static char *port_str; 664 static int detach_from_console; 665 static int daemon_child = -1; 666 667 static struct getargs args[] = { 668 { "config-file", 'c', arg_string, &config_file, NULL, NULL }, 669 { "realm", 'r', arg_string, &realm, NULL, NULL }, 670 { "keytab", 'k', arg_string, &keytab_str, 671 "keytab to get authentication from", "kspec" }, 672 { "time-lost", 0, arg_string, &server_time_lost, 673 "time before server is considered lost", "time" }, 674 { "status-file", 0, arg_string, &status_file, 675 "file to write out status into", "file" }, 676 { "port", 0, arg_string, &port_str, 677 "port ipropd-slave will connect to", "port"}, 678 { "detach", 0, arg_flag, &detach_from_console, 679 "detach from console", NULL }, 680 { "daemon-child", 0 , arg_integer, &daemon_child, 681 "private argument, do not use", NULL }, 682 { "hostname", 0, arg_string, rk_UNCONST(&slave_str), 683 "hostname of slave (if not same as hostname)", "hostname" }, 684 { "verbose", 0, arg_flag, &verbose, NULL, NULL }, 685 { "version", 0, arg_flag, &version_flag, NULL, NULL }, 686 { "help", 0, arg_flag, &help_flag, NULL, NULL } 687 }; 688 689 static int num_args = sizeof(args) / sizeof(args[0]); 690 691 static void 692 usage(int status) 693 { 694 arg_printusage(args, num_args, NULL, "master"); 695 exit(status); 696 } 697 698 int 699 main(int argc, char **argv) 700 { 701 krb5_error_code ret, ret2; 702 krb5_context context; 703 krb5_auth_context auth_context; 704 void *kadm_handle; 705 kadm5_server_context *server_context; 706 kadm5_config_params conf; 707 int master_fd; 708 krb5_ccache ccache; 709 krb5_principal server; 710 char **files; 711 int optidx = 0; 712 time_t reconnect_min; 713 time_t backoff; 714 time_t reconnect_max; 715 time_t reconnect; 716 time_t before = 0; 717 int restarter_fd = -1; 718 719 const char *master; 720 721 setprogname(argv[0]); 722 723 if (getarg(args, num_args, argc, argv, &optidx)) 724 usage(1); 725 726 if (help_flag) 727 usage(0); 728 729 if (version_flag) { 730 print_version(NULL); 731 exit(0); 732 } 733 734 if (detach_from_console && daemon_child == -1) 735 roken_detach_prep(argc, argv, "--daemon-child"); 736 rk_pidfile(NULL); 737 738 ret = krb5_init_context(&context); 739 if (ret) 740 errx (1, "krb5_init_context failed: %d", ret); 741 742 setup_signal(); 743 744 if (config_file == NULL) { 745 if (asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context)) == -1 746 || config_file == NULL) 747 errx(1, "out of memory"); 748 } 749 750 ret = krb5_prepend_config_files_default(config_file, &files); 751 if (ret) 752 krb5_err(context, 1, ret, "getting configuration files"); 753 754 ret = krb5_set_config_files(context, files); 755 krb5_free_config_files(files); 756 if (ret) 757 krb5_err(context, 1, ret, "reading configuration files"); 758 759 argc -= optidx; 760 argv += optidx; 761 762 if (argc != 1) 763 usage(1); 764 765 master = argv[0]; 766 767 if (status_file == NULL) { 768 if (asprintf(&status_file, "%s/ipropd-slave-status", hdb_db_dir(context)) < 0 || status_file == NULL) 769 krb5_errx(context, 1, "can't allocate status file buffer"); 770 } 771 772 krb5_openlog(context, "ipropd-slave", &log_facility); 773 krb5_set_warn_dest(context, log_facility); 774 775 slave_status(context, status_file, "bootstrapping"); 776 777 ret = krb5_kt_register(context, &hdb_get_kt_ops); 778 if(ret) 779 krb5_err(context, 1, ret, "krb5_kt_register"); 780 781 time_before_lost = parse_time (server_time_lost, "s"); 782 if (time_before_lost < 0) 783 krb5_errx (context, 1, "couldn't parse time: %s", server_time_lost); 784 785 slave_status(context, status_file, "getting credentials from keytab/database"); 786 787 memset(&conf, 0, sizeof(conf)); 788 if(realm) { 789 conf.mask |= KADM5_CONFIG_REALM; 790 conf.realm = realm; 791 } 792 ret = kadm5_init_with_password_ctx (context, 793 KADM5_ADMIN_SERVICE, 794 NULL, 795 KADM5_ADMIN_SERVICE, 796 &conf, 0, 0, 797 &kadm_handle); 798 if (ret) 799 krb5_err (context, 1, ret, "kadm5_init_with_password_ctx"); 800 801 server_context = (kadm5_server_context *)kadm_handle; 802 803 slave_status(context, status_file, "creating log file"); 804 805 ret = kadm5_log_init (server_context); 806 if (ret) 807 krb5_err (context, 1, ret, "kadm5_log_init"); 808 809 get_creds(context, keytab_str, &ccache, master); 810 811 ret = krb5_sname_to_principal (context, master, IPROP_NAME, 812 KRB5_NT_SRV_HST, &server); 813 if (ret) 814 krb5_err (context, 1, ret, "krb5_sname_to_principal"); 815 816 auth_context = NULL; 817 master_fd = -1; 818 819 krb5_appdefault_time(context, config_name, NULL, "reconnect-min", 820 10, &reconnect_min); 821 krb5_appdefault_time(context, config_name, NULL, "reconnect-max", 822 300, &reconnect_max); 823 krb5_appdefault_time(context, config_name, NULL, "reconnect-backoff", 824 10, &backoff); 825 reconnect = reconnect_min; 826 827 slave_status(context, status_file, "ipropd-slave started"); 828 829 roken_detach_finish(NULL, daemon_child); 830 restarter_fd = restarter(context, NULL); 831 832 while (!exit_flag) { 833 struct timeval to; 834 time_t now, elapsed; 835 fd_set readset; 836 int connected = FALSE; 837 838 #ifndef NO_LIMIT_FD_SETSIZE 839 if (restarter_fd >= FD_SETSIZE) 840 krb5_errx(context, IPROPD_RESTART, "fd too large"); 841 #endif 842 843 FD_ZERO(&readset); 844 if (restarter_fd > -1) 845 FD_SET(restarter_fd, &readset); 846 847 now = time(NULL); 848 elapsed = now - before; 849 850 if (elapsed < reconnect) { 851 time_t left = reconnect - elapsed; 852 krb5_warnx(context, "sleeping %d seconds before " 853 "retrying to connect", (int)left); 854 to.tv_sec = left; 855 to.tv_usec = 0; 856 if (select(restarter_fd + 1, &readset, NULL, NULL, &to) == 1) { 857 exit_flag = SIGTERM; 858 continue; 859 } 860 } 861 before = now; 862 863 slave_status(context, status_file, "connecting to master: %s\n", master); 864 865 master_fd = connect_to_master (context, master, port_str); 866 if (master_fd < 0) 867 goto retry; 868 869 reconnect = reconnect_min; 870 871 if (auth_context) { 872 krb5_auth_con_free(context, auth_context); 873 auth_context = NULL; 874 krb5_cc_destroy(context, ccache); 875 get_creds(context, keytab_str, &ccache, master); 876 } 877 if (verbose) 878 krb5_warnx(context, "authenticating to master"); 879 ret = krb5_sendauth (context, &auth_context, &master_fd, 880 IPROP_VERSION, NULL, server, 881 AP_OPTS_MUTUAL_REQUIRED, NULL, NULL, 882 ccache, NULL, NULL, NULL); 883 if (ret) { 884 krb5_warn (context, ret, "krb5_sendauth"); 885 goto retry; 886 } 887 888 krb5_warnx(context, "ipropd-slave started at version: %ld", 889 (long)server_context->log_context.version); 890 891 ret = ihave(context, auth_context, master_fd, 892 server_context->log_context.version); 893 if (ret) 894 goto retry; 895 896 connected = TRUE; 897 898 if (verbose) 899 krb5_warnx(context, "connected to master"); 900 901 slave_status(context, status_file, "connected to master, waiting instructions"); 902 903 while (connected && !exit_flag) { 904 krb5_data out; 905 krb5_storage *sp; 906 uint32_t tmp; 907 int max_fd; 908 909 #ifndef NO_LIMIT_FD_SETSIZE 910 if (master_fd >= FD_SETSIZE) 911 krb5_errx(context, IPROPD_RESTART, "fd too large"); 912 if (restarter_fd >= FD_SETSIZE) 913 krb5_errx(context, IPROPD_RESTART, "fd too large"); 914 max_fd = max(restarter_fd, master_fd); 915 #endif 916 917 FD_ZERO(&readset); 918 FD_SET(master_fd, &readset); 919 if (restarter_fd != -1) 920 FD_SET(restarter_fd, &readset); 921 922 to.tv_sec = time_before_lost; 923 to.tv_usec = 0; 924 925 ret = select (max_fd + 1, 926 &readset, NULL, NULL, &to); 927 if (ret < 0) { 928 if (errno == EINTR) 929 continue; 930 else 931 krb5_err (context, 1, errno, "select"); 932 } 933 if (ret == 0) { 934 krb5_warnx(context, "server didn't send a message " 935 "in %d seconds", time_before_lost); 936 connected = FALSE; 937 continue; 938 } 939 940 if (restarter_fd > -1 && FD_ISSET(restarter_fd, &readset)) { 941 if (verbose) 942 krb5_warnx(context, "slave restarter exited"); 943 exit_flag = SIGTERM; 944 } 945 946 if (!FD_ISSET(master_fd, &readset)) 947 continue; 948 949 if (verbose) 950 krb5_warnx(context, "message from master"); 951 952 ret = krb5_read_priv_message(context, auth_context, &master_fd, &out); 953 if (ret) { 954 krb5_warn(context, ret, "krb5_read_priv_message"); 955 connected = FALSE; 956 continue; 957 } 958 959 sp = krb5_storage_from_mem (out.data, out.length); 960 if (sp == NULL) 961 krb5_err(context, IPROPD_RESTART, errno, "krb5_storage_from_mem"); 962 ret = krb5_ret_uint32(sp, &tmp); 963 if (ret == HEIM_ERR_EOF) { 964 krb5_warn(context, ret, "master sent zero-length message"); 965 connected = FALSE; 966 continue; 967 } 968 if (ret != 0) { 969 krb5_warn(context, ret, "couldn't read master's message"); 970 connected = FALSE; 971 continue; 972 } 973 974 ret = kadm5_log_init(server_context); 975 if (ret) { 976 krb5_err(context, IPROPD_RESTART, ret, "kadm5_log_init while " 977 "handling a message from the master"); 978 } 979 switch (tmp) { 980 case FOR_YOU : 981 if (verbose) 982 krb5_warnx(context, "master sent us diffs"); 983 ret2 = receive(context, sp, server_context); 984 if (ret2) 985 krb5_warn(context, ret2, 986 "receive from ipropd-master had errors"); 987 ret = ihave(context, auth_context, master_fd, 988 server_context->log_context.version); 989 if (ret || ret2) 990 connected = FALSE; 991 992 /* 993 * If it returns an error, receive() may nonetheless 994 * have committed some entries successfully, so we must 995 * update the slave_status even if there were errors. 996 */ 997 is_up_to_date(context, status_file, server_context); 998 break; 999 case TELL_YOU_EVERYTHING : 1000 if (verbose) 1001 krb5_warnx(context, "master sent us a full dump"); 1002 ret = receive_everything(context, master_fd, server_context, 1003 auth_context); 1004 if (ret == 0) { 1005 ret = ihave(context, auth_context, master_fd, 1006 server_context->log_context.version); 1007 } 1008 if (ret) 1009 connected = FALSE; 1010 else 1011 is_up_to_date(context, status_file, server_context); 1012 break; 1013 case ARE_YOU_THERE : 1014 if (verbose) 1015 krb5_warnx(context, "master sent us a ping"); 1016 is_up_to_date(context, status_file, server_context); 1017 /* 1018 * We used to send an I_HAVE here. But the master may send 1019 * ARE_YOU_THERE messages in response to local, possibly- 1020 * transient errors, and if that happens and we respond with an 1021 * I_HAVE then we'll loop hard if the error was not transient. 1022 * 1023 * So we don't ihave() here. 1024 */ 1025 send_im_here(context, master_fd, auth_context); 1026 break; 1027 case YOU_HAVE_LAST_VERSION: 1028 if (verbose) 1029 krb5_warnx(context, "master tells us we are up to date"); 1030 is_up_to_date(context, status_file, server_context); 1031 break; 1032 case NOW_YOU_HAVE : 1033 case I_HAVE : 1034 case ONE_PRINC : 1035 case I_AM_HERE : 1036 default : 1037 krb5_warnx (context, "Ignoring command %d", tmp); 1038 break; 1039 } 1040 krb5_storage_free (sp); 1041 krb5_data_free (&out); 1042 1043 } 1044 1045 slave_status(context, status_file, "disconnected from master"); 1046 retry: 1047 if (connected == FALSE) 1048 krb5_warnx (context, "disconnected for server"); 1049 1050 if (exit_flag) 1051 krb5_warnx (context, "got an exit signal"); 1052 1053 if (master_fd >= 0) 1054 close(master_fd); 1055 1056 reconnect += backoff; 1057 if (reconnect > reconnect_max) { 1058 slave_status(context, status_file, "disconnected from master for a long time"); 1059 reconnect = reconnect_max; 1060 } 1061 } 1062 1063 if (status_file) { 1064 /* XXX It'd be better to leave it saying we're not here */ 1065 unlink(status_file); 1066 } 1067 1068 if (0); 1069 #ifndef NO_SIGXCPU 1070 else if(exit_flag == SIGXCPU) 1071 krb5_warnx(context, "%s CPU time limit exceeded", getprogname()); 1072 #endif 1073 else if(exit_flag == SIGINT || exit_flag == SIGTERM) 1074 krb5_warnx(context, "%s terminated", getprogname()); 1075 else 1076 krb5_warnx(context, "%s unexpected exit reason: %ld", 1077 getprogname(), (long)exit_flag); 1078 1079 return 0; 1080 } 1081
Indexes created Sat Feb 28 05:31:39 UTC 2026