1 /* $OpenBSD: ldapclient.c,v 1.31 2014/11/16 23:24:44 tedu Exp $ */ 2 /* $FreeBSD$ */ 3 4 /* 5 * Copyright (c) 2008 Alexander Schrijver <aschrijver@openbsd.org> 6 * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include <sys/types.h> 22 #include <sys/param.h> 23 #include <sys/queue.h> 24 #include <sys/socket.h> 25 #include <sys/tree.h> 26 27 #include <netinet/in.h> 28 #include <arpa/inet.h> 29 30 #include <netdb.h> 31 #include <errno.h> 32 #include <err.h> 33 #include <event.h> 34 #include <fcntl.h> 35 #include <unistd.h> 36 #include <pwd.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 42 #include "aldap.h" 43 #include "ypldap.h" 44 45 void client_sig_handler(int, short, void *); 46 void client_dispatch_dns(int, short, void *); 47 void client_dispatch_parent(int, short, void *); 48 void client_shutdown(void); 49 void client_connect(int, short, void *); 50 void client_configure(struct env *); 51 void client_periodic_update(int, short, void *); 52 int client_build_req(struct idm *, struct idm_req *, struct aldap_message *, 53 int, int); 54 int client_search_idm(struct env *, struct idm *, struct aldap *, 55 char **, char *, int, int, enum imsg_type); 56 int client_try_idm(struct env *, struct idm *); 57 int client_addr_init(struct idm *); 58 int client_addr_free(struct idm *); 59 60 struct aldap *client_aldap_open(struct ypldap_addr_list *); 61 62 /* 63 * dummy wrapper to provide aldap_init with its fd's. 64 */ 65 struct aldap * 66 client_aldap_open(struct ypldap_addr_list *addr) 67 { 68 int fd = -1; 69 struct ypldap_addr *p; 70 71 TAILQ_FOREACH(p, addr, next) { 72 char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 73 struct sockaddr *sa = (struct sockaddr *)&p->ss; 74 75 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), sbuf, 76 sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 77 errx(1, "could not get numeric hostname"); 78 79 if ((fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0) 80 return NULL; 81 82 if (connect(fd, sa, sa->sa_len) == 0) 83 break; 84 85 warn("connect to %s port %s (%s) failed", hbuf, sbuf, "tcp"); 86 close(fd); 87 } 88 89 if (fd == -1) 90 return NULL; 91 92 return aldap_init(fd); 93 } 94 95 int 96 client_addr_init(struct idm *idm) 97 { 98 struct sockaddr_in *sa_in; 99 struct sockaddr_in6 *sa_in6; 100 struct ypldap_addr *h; 101 102 TAILQ_FOREACH(h, &idm->idm_addr, next) { 103 switch (h->ss.ss_family) { 104 case AF_INET: 105 sa_in = (struct sockaddr_in *)&h->ss; 106 if (ntohs(sa_in->sin_port) == 0) 107 sa_in->sin_port = htons(LDAP_PORT); 108 idm->idm_state = STATE_DNS_DONE; 109 break; 110 case AF_INET6: 111 sa_in6 = (struct sockaddr_in6 *)&h->ss; 112 if (ntohs(sa_in6->sin6_port) == 0) 113 sa_in6->sin6_port = htons(LDAP_PORT); 114 idm->idm_state = STATE_DNS_DONE; 115 break; 116 default: 117 fatalx("king bula sez: wrong AF in client_addr_init"); 118 /* not reached */ 119 } 120 } 121 122 return (0); 123 } 124 125 int 126 client_addr_free(struct idm *idm) 127 { 128 struct ypldap_addr *h; 129 130 while (!TAILQ_EMPTY(&idm->idm_addr)) { 131 h = TAILQ_FIRST(&idm->idm_addr); 132 TAILQ_REMOVE(&idm->idm_addr, h, next); 133 free(h); 134 } 135 136 return (0); 137 } 138 139 void 140 client_sig_handler(int sig, short event, void *p) 141 { 142 switch (sig) { 143 case SIGINT: 144 case SIGTERM: 145 client_shutdown(); 146 break; 147 default: 148 fatalx("unexpected signal"); 149 } 150 } 151 152 void 153 client_dispatch_dns(int fd, short events, void *p) 154 { 155 struct imsg imsg; 156 u_int16_t dlen; 157 u_char *data; 158 struct ypldap_addr *h; 159 int n, wait_cnt = 0; 160 struct idm *idm; 161 int shut = 0; 162 163 struct env *env = p; 164 struct imsgev *iev = env->sc_iev_dns; 165 struct imsgbuf *ibuf = &iev->ibuf; 166 167 if ((events & (EV_READ | EV_WRITE)) == 0) 168 fatalx("unknown event"); 169 170 if (events & EV_READ) { 171 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 172 fatal("imsg_read error"); 173 if (n == 0) 174 shut = 1; 175 } 176 if (events & EV_WRITE) { 177 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 178 fatal("msgbuf_write"); 179 if (n == 0) 180 shut = 1; 181 goto done; 182 } 183 184 for (;;) { 185 if ((n = imsg_get(ibuf, &imsg)) == -1) 186 fatal("client_dispatch_dns: imsg_get error"); 187 if (n == 0) 188 break; 189 190 switch (imsg.hdr.type) { 191 case IMSG_HOST_DNS: 192 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) 193 if (idm->idm_id == imsg.hdr.peerid) 194 break; 195 if (idm == NULL) { 196 log_warnx("IMSG_HOST_DNS with invalid peerID"); 197 break; 198 } 199 if (!TAILQ_EMPTY(&idm->idm_addr)) { 200 log_warnx("IMSG_HOST_DNS but addrs set!"); 201 break; 202 } 203 204 dlen = imsg.hdr.len - IMSG_HEADER_SIZE; 205 if (dlen == 0) { /* no data -> temp error */ 206 idm->idm_state = STATE_DNS_TEMPFAIL; 207 break; 208 } 209 210 data = (u_char *)imsg.data; 211 while (dlen >= sizeof(struct sockaddr_storage)) { 212 if ((h = calloc(1, sizeof(*h))) == NULL) 213 fatal(NULL); 214 memcpy(&h->ss, data, sizeof(h->ss)); 215 TAILQ_INSERT_HEAD(&idm->idm_addr, h, next); 216 217 data += sizeof(h->ss); 218 dlen -= sizeof(h->ss); 219 } 220 if (dlen != 0) 221 fatalx("IMSG_HOST_DNS: dlen != 0"); 222 223 client_addr_init(idm); 224 225 break; 226 default: 227 break; 228 } 229 imsg_free(&imsg); 230 } 231 232 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) { 233 if (client_try_idm(env, idm) == -1) 234 idm->idm_state = STATE_LDAP_FAIL; 235 236 if (idm->idm_state < STATE_LDAP_DONE) 237 wait_cnt++; 238 } 239 if (wait_cnt == 0) 240 imsg_compose_event(env->sc_iev, IMSG_END_UPDATE, 0, 0, -1, 241 NULL, 0); 242 243 done: 244 if (!shut) 245 imsg_event_add(iev); 246 else { 247 /* this pipe is dead, so remove the event handler */ 248 event_del(&iev->ev); 249 event_loopexit(NULL); 250 } 251 } 252 253 void 254 client_dispatch_parent(int fd, short events, void *p) 255 { 256 int n; 257 int shut = 0; 258 struct imsg imsg; 259 struct env *env = p; 260 struct imsgev *iev = env->sc_iev; 261 struct imsgbuf *ibuf = &iev->ibuf; 262 263 if ((events & (EV_READ | EV_WRITE)) == 0) 264 fatalx("unknown event"); 265 266 if (events & EV_READ) { 267 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 268 fatal("imsg_read error"); 269 if (n == 0) 270 shut = 1; 271 } 272 if (events & EV_WRITE) { 273 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 274 fatal("msgbuf_write"); 275 if (n == 0) 276 shut = 1; 277 goto done; 278 } 279 280 for (;;) { 281 if ((n = imsg_get(ibuf, &imsg)) == -1) 282 fatal("client_dispatch_parent: imsg_get error"); 283 if (n == 0) 284 break; 285 286 switch (imsg.hdr.type) { 287 case IMSG_CONF_START: { 288 struct env params; 289 290 if (env->sc_flags & F_CONFIGURING) { 291 log_warnx("configuration already in progress"); 292 break; 293 } 294 memcpy(¶ms, imsg.data, sizeof(params)); 295 log_debug("configuration starting"); 296 env->sc_flags |= F_CONFIGURING; 297 purge_config(env); 298 memcpy(&env->sc_conf_tv, ¶ms.sc_conf_tv, 299 sizeof(env->sc_conf_tv)); 300 env->sc_flags |= params.sc_flags; 301 break; 302 } 303 case IMSG_CONF_IDM: { 304 struct idm *idm; 305 306 if (!(env->sc_flags & F_CONFIGURING)) 307 break; 308 if ((idm = calloc(1, sizeof(*idm))) == NULL) 309 fatal(NULL); 310 memcpy(idm, imsg.data, sizeof(*idm)); 311 idm->idm_env = env; 312 TAILQ_INSERT_TAIL(&env->sc_idms, idm, idm_entry); 313 break; 314 } 315 case IMSG_CONF_END: 316 env->sc_flags &= ~F_CONFIGURING; 317 log_debug("applying configuration"); 318 client_configure(env); 319 break; 320 default: 321 log_debug("client_dispatch_parent: unexpect imsg %d", 322 imsg.hdr.type); 323 324 break; 325 } 326 imsg_free(&imsg); 327 } 328 329 done: 330 if (!shut) 331 imsg_event_add(iev); 332 else { 333 /* this pipe is dead, so remove the event handler */ 334 event_del(&iev->ev); 335 event_loopexit(NULL); 336 } 337 } 338 339 void 340 client_shutdown(void) 341 { 342 log_info("ldap client exiting"); 343 _exit(0); 344 } 345 346 pid_t 347 ldapclient(int pipe_main2client[2]) 348 { 349 pid_t pid, dns_pid; 350 int pipe_dns[2]; 351 struct passwd *pw; 352 struct event ev_sigint; 353 struct event ev_sigterm; 354 struct env env; 355 356 switch (pid = fork()) { 357 case -1: 358 fatal("cannot fork"); 359 break; 360 case 0: 361 break; 362 default: 363 return (pid); 364 } 365 366 memset(&env, 0, sizeof(env)); 367 TAILQ_INIT(&env.sc_idms); 368 369 if ((pw = getpwnam(YPLDAP_USER)) == NULL) 370 fatal("getpwnam"); 371 372 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_dns) == -1) 373 fatal("socketpair"); 374 dns_pid = ypldap_dns(pipe_dns, pw); 375 close(pipe_dns[1]); 376 377 #ifndef DEBUG 378 if (chroot(pw->pw_dir) == -1) 379 fatal("chroot"); 380 if (chdir("/") == -1) 381 fatal("chdir"); 382 #else 383 #warning disabling chrooting in DEBUG mode 384 #endif 385 setproctitle("ldap client"); 386 ypldap_process = PROC_CLIENT; 387 388 #ifndef DEBUG 389 if (setgroups(1, &pw->pw_gid) || 390 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 391 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 392 fatal("cannot drop privileges"); 393 #else 394 #warning disabling privilege revocation in DEBUG mode 395 #endif 396 397 event_init(); 398 signal(SIGPIPE, SIG_IGN); 399 signal_set(&ev_sigint, SIGINT, client_sig_handler, NULL); 400 signal_set(&ev_sigterm, SIGTERM, client_sig_handler, NULL); 401 signal_add(&ev_sigint, NULL); 402 signal_add(&ev_sigterm, NULL); 403 404 close(pipe_main2client[0]); 405 if ((env.sc_iev = calloc(1, sizeof(*env.sc_iev))) == NULL) 406 fatal(NULL); 407 if ((env.sc_iev_dns = calloc(1, sizeof(*env.sc_iev_dns))) == NULL) 408 fatal(NULL); 409 410 env.sc_iev->events = EV_READ; 411 env.sc_iev->data = &env; 412 imsg_init(&env.sc_iev->ibuf, pipe_main2client[1]); 413 env.sc_iev->handler = client_dispatch_parent; 414 event_set(&env.sc_iev->ev, env.sc_iev->ibuf.fd, env.sc_iev->events, 415 env.sc_iev->handler, &env); 416 event_add(&env.sc_iev->ev, NULL); 417 418 env.sc_iev_dns->events = EV_READ; 419 env.sc_iev_dns->data = &env; 420 imsg_init(&env.sc_iev_dns->ibuf, pipe_dns[0]); 421 env.sc_iev_dns->handler = client_dispatch_dns; 422 event_set(&env.sc_iev_dns->ev, env.sc_iev_dns->ibuf.fd, 423 env.sc_iev_dns->events, env.sc_iev_dns->handler, &env); 424 event_add(&env.sc_iev_dns->ev, NULL); 425 426 event_dispatch(); 427 client_shutdown(); 428 429 return (0); 430 431 } 432 433 int 434 client_build_req(struct idm *idm, struct idm_req *ir, struct aldap_message *m, 435 int min_attr, int max_attr) 436 { 437 char **ldap_attrs; 438 int i, k; 439 440 memset(ir, 0, sizeof(*ir)); 441 for (i = min_attr; i < max_attr; i++) { 442 if (idm->idm_flags & F_FIXED_ATTR(i)) { 443 if (strlcat(ir->ir_line, idm->idm_attrs[i], 444 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) 445 /* 446 * entry yields a line > 1024, trash it. 447 */ 448 return (-1); 449 450 if (i == ATTR_UID) { 451 ir->ir_key.ik_uid = strtonum( 452 idm->idm_attrs[i], 0, 453 UID_MAX, NULL); 454 } else if (i == ATTR_GR_GID) { 455 ir->ir_key.ik_gid = strtonum( 456 idm->idm_attrs[i], 0, 457 GID_MAX, NULL); 458 } 459 } else if (idm->idm_list & F_LIST(i)) { 460 aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs); 461 for (k = 0; k >= 0 && ldap_attrs && ldap_attrs[k] != NULL; k++) { 462 /* XXX: Fail when attributes have illegal characters e.g. ',' */ 463 if (strlcat(ir->ir_line, ldap_attrs[k], 464 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) 465 continue; 466 if (ldap_attrs[k+1] != NULL) 467 if (strlcat(ir->ir_line, ",", 468 sizeof(ir->ir_line)) 469 >= sizeof(ir->ir_line)) { 470 aldap_free_attr(ldap_attrs); 471 return (-1); 472 } 473 } 474 aldap_free_attr(ldap_attrs); 475 } else { 476 if (aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs) == -1) 477 return (-1); 478 if (strlcat(ir->ir_line, ldap_attrs[0], 479 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) { 480 aldap_free_attr(ldap_attrs); 481 return (-1); 482 } 483 if (i == ATTR_UID) { 484 ir->ir_key.ik_uid = strtonum( 485 ldap_attrs[0], 0, UID_MAX, NULL); 486 } else if (i == ATTR_GR_GID) { 487 ir->ir_key.ik_uid = strtonum( 488 ldap_attrs[0], 0, GID_MAX, NULL); 489 } 490 aldap_free_attr(ldap_attrs); 491 } 492 493 if (i + 1 != max_attr) 494 if (strlcat(ir->ir_line, ":", 495 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) 496 return (-1); 497 } 498 499 return (0); 500 } 501 502 int 503 client_search_idm(struct env *env, struct idm *idm, struct aldap *al, 504 char **attrs, char *filter, int min_attr, int max_attr, 505 enum imsg_type type) 506 { 507 struct idm_req ir; 508 struct aldap_message *m; 509 struct aldap_page_control *pg = NULL; 510 const char *errstr; 511 char *dn; 512 513 dn = idm->idm_basedn; 514 if (type == IMSG_GRP_ENTRY && idm->idm_groupdn[0] != '\0') 515 dn = idm->idm_groupdn; 516 517 do { 518 if (aldap_search(al, dn, LDAP_SCOPE_SUBTREE, 519 filter, attrs, 0, 0, 0, pg) == -1) { 520 aldap_get_errno(al, &errstr); 521 log_debug("%s", errstr); 522 return (-1); 523 } 524 525 if (pg != NULL) { 526 aldap_freepage(pg); 527 pg = NULL; 528 } 529 530 while ((m = aldap_parse(al)) != NULL) { 531 if (al->msgid != m->msgid) { 532 goto fail; 533 } 534 535 if (m->message_type == LDAP_RES_SEARCH_RESULT) { 536 if (m->page != NULL && m->page->cookie_len != 0) 537 pg = m->page; 538 else 539 pg = NULL; 540 541 aldap_freemsg(m); 542 break; 543 } 544 545 if (m->message_type != LDAP_RES_SEARCH_ENTRY) { 546 goto fail; 547 } 548 549 if (client_build_req(idm, &ir, m, min_attr, max_attr) == 0) 550 imsg_compose_event(env->sc_iev, type, 0, 0, -1, 551 &ir, sizeof(ir)); 552 553 aldap_freemsg(m); 554 } 555 } while (pg != NULL); 556 557 return (0); 558 559 fail: 560 aldap_freemsg(m); 561 if (pg != NULL) { 562 aldap_freepage(pg); 563 } 564 565 return (-1); 566 } 567 568 int 569 client_try_idm(struct env *env, struct idm *idm) 570 { 571 const char *where; 572 char *attrs[ATTR_MAX+1]; 573 int i, j; 574 struct aldap_message *m; 575 struct aldap *al; 576 577 where = "connect"; 578 if ((al = client_aldap_open(&idm->idm_addr)) == NULL) 579 return (-1); 580 581 if (idm->idm_flags & F_NEEDAUTH) { 582 where = "binding"; 583 if (aldap_bind(al, idm->idm_binddn, idm->idm_bindcred) == -1) 584 goto bad; 585 586 where = "parsing"; 587 if ((m = aldap_parse(al)) == NULL) 588 goto bad; 589 where = "verifying msgid"; 590 if (al->msgid != m->msgid) { 591 aldap_freemsg(m); 592 goto bad; 593 } 594 aldap_freemsg(m); 595 } 596 597 memset(attrs, 0, sizeof(attrs)); 598 for (i = 0, j = 0; i < ATTR_MAX; i++) { 599 if (idm->idm_flags & F_FIXED_ATTR(i)) 600 continue; 601 attrs[j++] = idm->idm_attrs[i]; 602 } 603 attrs[j] = NULL; 604 605 /* 606 * build password line. 607 */ 608 where = "search"; 609 log_debug("searching password entries"); 610 if (client_search_idm(env, idm, al, attrs, 611 idm->idm_filters[FILTER_USER], 0, ATTR_MAX, IMSG_PW_ENTRY) == -1) 612 goto bad; 613 614 memset(attrs, 0, sizeof(attrs)); 615 for (i = ATTR_GR_MIN, j = 0; i < ATTR_GR_MAX; i++) { 616 if (idm->idm_flags & F_FIXED_ATTR(i)) 617 continue; 618 attrs[j++] = idm->idm_attrs[i]; 619 } 620 attrs[j] = NULL; 621 622 /* 623 * build group line. 624 */ 625 where = "search"; 626 log_debug("searching group entries"); 627 if (client_search_idm(env, idm, al, attrs, 628 idm->idm_filters[FILTER_GROUP], ATTR_GR_MIN, ATTR_GR_MAX, 629 IMSG_GRP_ENTRY) == -1) 630 goto bad; 631 632 aldap_close(al); 633 634 idm->idm_state = STATE_LDAP_DONE; 635 636 return (0); 637 bad: 638 aldap_close(al); 639 log_debug("directory %s errored out in %s", idm->idm_name, where); 640 return (-1); 641 } 642 643 void 644 client_periodic_update(int fd, short event, void *p) 645 { 646 struct env *env = p; 647 648 struct idm *idm; 649 int fail_cnt = 0; 650 651 /* If LDAP isn't finished, notify the master process to trash the 652 * update. */ 653 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) { 654 if (idm->idm_state < STATE_LDAP_DONE) 655 fail_cnt++; 656 657 idm->idm_state = STATE_NONE; 658 659 client_addr_free(idm); 660 } 661 if (fail_cnt > 0) { 662 log_debug("trash the update"); 663 imsg_compose_event(env->sc_iev, IMSG_TRASH_UPDATE, 0, 0, -1, 664 NULL, 0); 665 } 666 667 client_configure(env); 668 } 669 670 void 671 client_configure(struct env *env) 672 { 673 struct timeval tv; 674 struct idm *idm; 675 u_int16_t dlen; 676 677 log_debug("connecting to directories"); 678 679 imsg_compose_event(env->sc_iev, IMSG_START_UPDATE, 0, 0, -1, NULL, 0); 680 681 /* Start the DNS lookups */ 682 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) { 683 dlen = strlen(idm->idm_name) + 1; 684 imsg_compose_event(env->sc_iev_dns, IMSG_HOST_DNS, idm->idm_id, 685 0, -1, idm->idm_name, dlen); 686 } 687 688 tv.tv_sec = env->sc_conf_tv.tv_sec; 689 tv.tv_usec = env->sc_conf_tv.tv_usec; 690 evtimer_set(&env->sc_conf_ev, client_periodic_update, env); 691 evtimer_add(&env->sc_conf_ev, &tv); 692 } 693