ldapclient.c revision 292270
1/* $OpenBSD: ldapclient.c,v 1.31 2014/11/16 23:24:44 tedu Exp $ */ 2/* $FreeBSD: head/usr.sbin/ypldap/ldapclient.c 292270 2015-12-15 15:37:58Z araujo $ */ 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 45void client_sig_handler(int, short, void *); 46void client_dispatch_dns(int, short, void *); 47void client_dispatch_parent(int, short, void *); 48void client_shutdown(void); 49void client_connect(int, short, void *); 50void client_configure(struct env *); 51void client_periodic_update(int, short, void *); 52int client_build_req(struct idm *, struct idm_req *, struct aldap_message *, 53 int, int); 54int client_search_idm(struct env *, struct idm *, struct aldap *, 55 char **, char *, int, int, enum imsg_type); 56int client_try_idm(struct env *, struct idm *); 57int client_addr_init(struct idm *); 58int client_addr_free(struct idm *); 59 60struct aldap *client_aldap_open(struct ypldap_addr *); 61 62/* 63 * dummy wrapper to provide aldap_init with its fd's. 64 */ 65struct aldap * 66client_aldap_open(struct ypldap_addr *addr) 67{ 68 int fd = -1; 69 struct ypldap_addr *p; 70 71 for (p = addr; p != NULL; p = p->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 95int 96client_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 for (h = idm->idm_addr; h != NULL; h = h->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 125int 126client_addr_free(struct idm *idm) 127{ 128 struct ypldap_addr *h, *p; 129 130 if (idm->idm_addr == NULL) 131 return (-1); 132 133 for (h = idm->idm_addr; h != NULL; h = p) { 134 p = h->next; 135 free(h); 136 } 137 138 idm->idm_addr = NULL; 139 140 return (0); 141} 142 143void 144client_sig_handler(int sig, short event, void *p) 145{ 146 switch (sig) { 147 case SIGINT: 148 case SIGTERM: 149 client_shutdown(); 150 break; 151 default: 152 fatalx("unexpected signal"); 153 } 154} 155 156void 157client_dispatch_dns(int fd, short events, void *p) 158{ 159 struct imsg imsg; 160 u_int16_t dlen; 161 u_char *data; 162 struct ypldap_addr *h; 163 int n, wait_cnt = 0; 164 struct idm *idm; 165 int shut = 0; 166 167 struct env *env = p; 168 struct imsgev *iev = env->sc_iev_dns; 169 struct imsgbuf *ibuf = &iev->ibuf; 170 171 if ((events & (EV_READ | EV_WRITE)) == 0) 172 fatalx("unknown event"); 173 174 if (events & EV_READ) { 175 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 176 fatal("imsg_read error"); 177 if (n == 0) 178 shut = 1; 179 } 180 if (events & EV_WRITE) { 181 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 182 fatal("msgbuf_write"); 183 if (n == 0) 184 shut = 1; 185 goto done; 186 } 187 188 for (;;) { 189 if ((n = imsg_get(ibuf, &imsg)) == -1) 190 fatal("client_dispatch_dns: imsg_get error"); 191 if (n == 0) 192 break; 193 194 switch (imsg.hdr.type) { 195 case IMSG_HOST_DNS: 196 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) 197 if (idm->idm_id == imsg.hdr.peerid) 198 break; 199 if (idm == NULL) { 200 log_warnx("IMSG_HOST_DNS with invalid peerID"); 201 break; 202 } 203 if (idm->idm_addr != NULL) { 204 log_warnx("IMSG_HOST_DNS but addr != NULL!"); 205 break; 206 } 207 208 dlen = imsg.hdr.len - IMSG_HEADER_SIZE; 209 if (dlen == 0) { /* no data -> temp error */ 210 idm->idm_state = STATE_DNS_TEMPFAIL; 211 break; 212 } 213 214 data = (u_char *)imsg.data; 215 while (dlen >= sizeof(struct sockaddr_storage)) { 216 if ((h = calloc(1, sizeof(struct ypldap_addr))) == 217 NULL) 218 fatal(NULL); 219 memcpy(&h->ss, data, sizeof(h->ss)); 220 221 if (idm->idm_addr == NULL) 222 h->next = NULL; 223 else 224 h->next = idm->idm_addr; 225 226 idm->idm_addr = h; 227 228 data += sizeof(h->ss); 229 dlen -= sizeof(h->ss); 230 } 231 if (dlen != 0) 232 fatalx("IMSG_HOST_DNS: dlen != 0"); 233 234 client_addr_init(idm); 235 236 break; 237 default: 238 break; 239 } 240 imsg_free(&imsg); 241 } 242 243 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) { 244 if (client_try_idm(env, idm) == -1) 245 idm->idm_state = STATE_LDAP_FAIL; 246 247 if (idm->idm_state < STATE_LDAP_DONE) 248 wait_cnt++; 249 } 250 if (wait_cnt == 0) 251 imsg_compose_event(env->sc_iev, IMSG_END_UPDATE, 0, 0, -1, 252 NULL, 0); 253 254done: 255 if (!shut) 256 imsg_event_add(iev); 257 else { 258 /* this pipe is dead, so remove the event handler */ 259 event_del(&iev->ev); 260 event_loopexit(NULL); 261 } 262} 263 264void 265client_dispatch_parent(int fd, short events, void *p) 266{ 267 int n; 268 int shut = 0; 269 struct imsg imsg; 270 struct env *env = p; 271 struct imsgev *iev = env->sc_iev; 272 struct imsgbuf *ibuf = &iev->ibuf; 273 274 if ((events & (EV_READ | EV_WRITE)) == 0) 275 fatalx("unknown event"); 276 277 if (events & EV_READ) { 278 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 279 fatal("imsg_read error"); 280 if (n == 0) 281 shut = 1; 282 } 283 if (events & EV_WRITE) { 284 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 285 fatal("msgbuf_write"); 286 if (n == 0) 287 shut = 1; 288 goto done; 289 } 290 291 for (;;) { 292 if ((n = imsg_get(ibuf, &imsg)) == -1) 293 fatal("client_dispatch_parent: imsg_get error"); 294 if (n == 0) 295 break; 296 297 switch (imsg.hdr.type) { 298 case IMSG_CONF_START: { 299 struct env params; 300 301 if (env->sc_flags & F_CONFIGURING) { 302 log_warnx("configuration already in progress"); 303 break; 304 } 305 memcpy(¶ms, imsg.data, sizeof(params)); 306 log_debug("configuration starting"); 307 env->sc_flags |= F_CONFIGURING; 308 purge_config(env); 309 memcpy(&env->sc_conf_tv, ¶ms.sc_conf_tv, 310 sizeof(env->sc_conf_tv)); 311 env->sc_flags |= params.sc_flags; 312 break; 313 } 314 case IMSG_CONF_IDM: { 315 struct idm *idm; 316 317 if (!(env->sc_flags & F_CONFIGURING)) 318 break; 319 if ((idm = calloc(1, sizeof(*idm))) == NULL) 320 fatal(NULL); 321 memcpy(idm, imsg.data, sizeof(*idm)); 322 idm->idm_env = env; 323 TAILQ_INSERT_TAIL(&env->sc_idms, idm, idm_entry); 324 break; 325 } 326 case IMSG_CONF_END: 327 env->sc_flags &= ~F_CONFIGURING; 328 log_debug("applying configuration"); 329 client_configure(env); 330 break; 331 default: 332 log_debug("client_dispatch_parent: unexpect imsg %d", 333 imsg.hdr.type); 334 335 break; 336 } 337 imsg_free(&imsg); 338 } 339 340done: 341 if (!shut) 342 imsg_event_add(iev); 343 else { 344 /* this pipe is dead, so remove the event handler */ 345 event_del(&iev->ev); 346 event_loopexit(NULL); 347 } 348} 349 350void 351client_shutdown(void) 352{ 353 log_info("ldap client exiting"); 354 _exit(0); 355} 356 357pid_t 358ldapclient(int pipe_main2client[2]) 359{ 360 pid_t pid, dns_pid; 361 int pipe_dns[2]; 362 struct passwd *pw; 363 struct event ev_sigint; 364 struct event ev_sigterm; 365 struct env env; 366 367 switch (pid = fork()) { 368 case -1: 369 fatal("cannot fork"); 370 break; 371 case 0: 372 break; 373 default: 374 return (pid); 375 } 376 377 bzero(&env, sizeof(env)); 378 TAILQ_INIT(&env.sc_idms); 379 380 if ((pw = getpwnam(YPLDAP_USER)) == NULL) { 381 printf("ldapclient.c error\n"); 382 fatal("getpwnam"); 383 } 384 385 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_dns) == -1) 386 fatal("socketpair"); 387 dns_pid = ypldap_dns(pipe_dns, pw); 388 close(pipe_dns[1]); 389 390#ifndef DEBUG 391 if (chroot(pw->pw_dir) == -1) 392 fatal("chroot"); 393 if (chdir("/") == -1) 394 fatal("chdir"); 395#else 396#warning disabling chrooting in DEBUG mode 397#endif 398 setproctitle("ldap client"); 399 ypldap_process = PROC_CLIENT; 400 401#ifndef DEBUG 402 if (setgroups(1, &pw->pw_gid) || 403 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 404 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 405 fatal("cannot drop privileges"); 406#else 407#warning disabling privilege revocation in DEBUG mode 408#endif 409 410 event_init(); 411 signal(SIGPIPE, SIG_IGN); 412 signal_set(&ev_sigint, SIGINT, client_sig_handler, NULL); 413 signal_set(&ev_sigterm, SIGTERM, client_sig_handler, NULL); 414 signal_add(&ev_sigint, NULL); 415 signal_add(&ev_sigterm, NULL); 416 417 close(pipe_main2client[0]); 418 if ((env.sc_iev = calloc(1, sizeof(*env.sc_iev))) == NULL) 419 fatal(NULL); 420 if ((env.sc_iev_dns = calloc(1, sizeof(*env.sc_iev_dns))) == NULL) 421 fatal(NULL); 422 423 env.sc_iev->events = EV_READ; 424 env.sc_iev->data = &env; 425 imsg_init(&env.sc_iev->ibuf, pipe_main2client[1]); 426 env.sc_iev->handler = client_dispatch_parent; 427 event_set(&env.sc_iev->ev, env.sc_iev->ibuf.fd, env.sc_iev->events, 428 env.sc_iev->handler, &env); 429 event_add(&env.sc_iev->ev, NULL); 430 431 env.sc_iev_dns->events = EV_READ; 432 env.sc_iev_dns->data = &env; 433 imsg_init(&env.sc_iev_dns->ibuf, pipe_dns[0]); 434 env.sc_iev_dns->handler = client_dispatch_dns; 435 event_set(&env.sc_iev_dns->ev, env.sc_iev_dns->ibuf.fd, 436 env.sc_iev_dns->events, env.sc_iev_dns->handler, &env); 437 event_add(&env.sc_iev_dns->ev, NULL); 438 439 event_dispatch(); 440 client_shutdown(); 441 442 return (0); 443 444} 445 446int 447client_build_req(struct idm *idm, struct idm_req *ir, struct aldap_message *m, 448 int min_attr, int max_attr) 449{ 450 char **ldap_attrs; 451 int i, k; 452 453 bzero(ir, sizeof(*ir)); 454 for (i = min_attr; i < max_attr; i++) { 455 if (idm->idm_flags & F_FIXED_ATTR(i)) { 456 if (strlcat(ir->ir_line, idm->idm_attrs[i], 457 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) 458 /* 459 * entry yields a line > 1024, trash it. 460 */ 461 return (-1); 462 463 if (i == ATTR_UID) { 464 ir->ir_key.ik_uid = strtonum( 465 idm->idm_attrs[i], 0, 466 UID_MAX, NULL); 467 } else if (i == ATTR_GR_GID) { 468 ir->ir_key.ik_gid = strtonum( 469 idm->idm_attrs[i], 0, 470 GID_MAX, NULL); 471 } 472 } else if (idm->idm_list & F_LIST(i)) { 473 aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs); 474 for (k = 0; k >= 0 && ldap_attrs && ldap_attrs[k] != NULL; k++) { 475 /* XXX: Fail when attributes have illegal characters e.g. ',' */ 476 if (strlcat(ir->ir_line, ldap_attrs[k], 477 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) 478 continue; 479 if (ldap_attrs[k+1] != NULL) 480 if (strlcat(ir->ir_line, ",", 481 sizeof(ir->ir_line)) 482 >= sizeof(ir->ir_line)) { 483 aldap_free_attr(ldap_attrs); 484 return (-1); 485 } 486 } 487 aldap_free_attr(ldap_attrs); 488 } else { 489 if (aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs) == -1) 490 return (-1); 491 if (ldap_attrs[0] == NULL) 492 return (-1); 493 if (strlcat(ir->ir_line, ldap_attrs[0], 494 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) { 495 aldap_free_attr(ldap_attrs); 496 return (-1); 497 } 498 if (i == ATTR_UID) { 499 ir->ir_key.ik_uid = strtonum( 500 ldap_attrs[0], 0, UID_MAX, NULL); 501 } else if (i == ATTR_GR_GID) { 502 ir->ir_key.ik_uid = strtonum( 503 ldap_attrs[0], 0, GID_MAX, NULL); 504 } 505 aldap_free_attr(ldap_attrs); 506 } 507 508 if (i + 1 != max_attr) 509 if (strlcat(ir->ir_line, ":", 510 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) 511 return (-1); 512 } 513 514 return (0); 515} 516 517int 518client_search_idm(struct env *env, struct idm *idm, struct aldap *al, 519 char **attrs, char *filter, int min_attr, int max_attr, 520 enum imsg_type type) 521{ 522 struct idm_req ir; 523 struct aldap_message *m; 524 struct aldap_page_control *pg = NULL; 525 const char *errstr; 526 char *dn; 527 528 dn = idm->idm_basedn; 529 if (type == IMSG_GRP_ENTRY && idm->idm_groupdn[0] != '\0') 530 dn = idm->idm_groupdn; 531 532 do { 533 if (aldap_search(al, dn, LDAP_SCOPE_SUBTREE, 534 filter, attrs, 0, 0, 0, pg) == -1) { 535 aldap_get_errno(al, &errstr); 536 log_debug("%s", errstr); 537 return (-1); 538 } 539 540 if (pg != NULL) { 541 aldap_freepage(pg); 542 pg = NULL; 543 } 544 545 while ((m = aldap_parse(al)) != NULL) { 546 if (al->msgid != m->msgid) { 547 goto fail; 548 } 549 550 if (m->message_type == LDAP_RES_SEARCH_RESULT) { 551 if (m->page != NULL && m->page->cookie_len != 0) 552 pg = m->page; 553 else 554 pg = NULL; 555 556 aldap_freemsg(m); 557 break; 558 } 559 560 if (m->message_type != LDAP_RES_SEARCH_ENTRY) { 561 goto fail; 562 } 563 564 if (client_build_req(idm, &ir, m, min_attr, max_attr) == 0) 565 imsg_compose_event(env->sc_iev, type, 0, 0, -1, 566 &ir, sizeof(ir)); 567 568 aldap_freemsg(m); 569 } 570 } while (pg != NULL); 571 572 return (0); 573 574fail: 575 aldap_freemsg(m); 576 if (pg != NULL) { 577 aldap_freepage(pg); 578 } 579 580 return (-1); 581} 582 583int 584client_try_idm(struct env *env, struct idm *idm) 585{ 586 const char *where; 587 char *attrs[ATTR_MAX+1]; 588 int i, j; 589 struct aldap_message *m; 590 struct aldap *al; 591 592 where = "connect"; 593 if ((al = client_aldap_open(idm->idm_addr)) == NULL) 594 return (-1); 595 596 if (idm->idm_flags & F_NEEDAUTH) { 597 where = "binding"; 598 if (aldap_bind(al, idm->idm_binddn, idm->idm_bindcred) == -1) 599 goto bad; 600 601 where = "parsing"; 602 if ((m = aldap_parse(al)) == NULL) 603 goto bad; 604 where = "verifying msgid"; 605 if (al->msgid != m->msgid) { 606 aldap_freemsg(m); 607 goto bad; 608 } 609 aldap_freemsg(m); 610 } 611 612 bzero(attrs, sizeof(attrs)); 613 for (i = 0, j = 0; i < ATTR_MAX; i++) { 614 if (idm->idm_flags & F_FIXED_ATTR(i)) 615 continue; 616 attrs[j++] = idm->idm_attrs[i]; 617 } 618 attrs[j] = NULL; 619 620 /* 621 * build password line. 622 */ 623 where = "search"; 624 log_debug("searching password entries"); 625 if (client_search_idm(env, idm, al, attrs, 626 idm->idm_filters[FILTER_USER], 0, ATTR_MAX, IMSG_PW_ENTRY) == -1) 627 goto bad; 628 629 bzero(attrs, sizeof(attrs)); 630 for (i = ATTR_GR_MIN, j = 0; i < ATTR_GR_MAX; i++) { 631 if (idm->idm_flags & F_FIXED_ATTR(i)) 632 continue; 633 attrs[j++] = idm->idm_attrs[i]; 634 } 635 attrs[j] = NULL; 636 637 /* 638 * build group line. 639 */ 640 where = "search"; 641 log_debug("searching group entries"); 642 if (client_search_idm(env, idm, al, attrs, 643 idm->idm_filters[FILTER_GROUP], ATTR_GR_MIN, ATTR_GR_MAX, 644 IMSG_GRP_ENTRY) == -1) 645 goto bad; 646 647 aldap_close(al); 648 649 idm->idm_state = STATE_LDAP_DONE; 650 651 return (0); 652bad: 653 aldap_close(al); 654 log_debug("directory %s errored out in %s", idm->idm_name, where); 655 return (-1); 656} 657 658void 659client_periodic_update(int fd, short event, void *p) 660{ 661 struct env *env = p; 662 663 struct idm *idm; 664 int fail_cnt = 0; 665 666 /* If LDAP isn't finished, notify the master process to trash the 667 * update. */ 668 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) { 669 if (idm->idm_state < STATE_LDAP_DONE) 670 fail_cnt++; 671 672 idm->idm_state = STATE_NONE; 673 674 client_addr_free(idm); 675 } 676 if (fail_cnt > 0) { 677 log_debug("trash the update"); 678 imsg_compose_event(env->sc_iev, IMSG_TRASH_UPDATE, 0, 0, -1, 679 NULL, 0); 680 } 681 682 client_configure(env); 683} 684 685void 686client_configure(struct env *env) 687{ 688 struct timeval tv; 689 struct idm *idm; 690 u_int16_t dlen; 691 692 log_debug("connecting to directories"); 693 694 imsg_compose_event(env->sc_iev, IMSG_START_UPDATE, 0, 0, -1, NULL, 0); 695 696 /* Start the DNS lookups */ 697 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) { 698 dlen = strlen(idm->idm_name) + 1; 699 imsg_compose_event(env->sc_iev_dns, IMSG_HOST_DNS, idm->idm_id, 700 0, -1, idm->idm_name, dlen); 701 } 702 703 tv.tv_sec = env->sc_conf_tv.tv_sec; 704 tv.tv_usec = env->sc_conf_tv.tv_usec; 705 evtimer_set(&env->sc_conf_ev, client_periodic_update, env); 706 evtimer_add(&env->sc_conf_ev, &tv); 707} 708