1 /* $OpenBSD: ldapclient.c,v 1.31 2014/11/16 23:24:44 tedu Exp $ */
4 * Copyright (c) 2008 Alexander Schrijver <aschrijver@openbsd.org>
5 * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include <sys/types.h>
21 #include <sys/param.h>
22 #include <sys/queue.h>
23 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
44 void client_sig_handler(int, short, void *);
45 void client_dispatch_dns(int, short, void *);
46 void client_dispatch_parent(int, short, void *);
47 void client_shutdown(void);
48 void client_connect(int, short, void *);
49 void client_configure(struct env *);
50 void client_periodic_update(int, short, void *);
51 int client_build_req(struct idm *, struct idm_req *, struct aldap_message *,
53 int client_search_idm(struct env *, struct idm *, struct aldap *,
54 char **, char *, int, int, enum imsg_type);
55 int client_try_idm(struct env *, struct idm *);
56 int client_addr_init(struct idm *);
57 int client_addr_free(struct idm *);
59 struct aldap *client_aldap_open(struct ypldap_addr_list *);
62 * dummy wrapper to provide aldap_init with its fd's.
65 client_aldap_open(struct ypldap_addr_list *addr)
68 struct ypldap_addr *p;
70 TAILQ_FOREACH(p, addr, next) {
71 char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
72 struct sockaddr *sa = (struct sockaddr *)&p->ss;
74 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), sbuf,
75 sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV))
76 errx(1, "could not get numeric hostname");
78 if ((fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0)
81 if (connect(fd, sa, sa->sa_len) == 0)
84 warn("connect to %s port %s (%s) failed", hbuf, sbuf, "tcp");
91 return aldap_init(fd);
95 client_addr_init(struct idm *idm)
97 struct sockaddr_in *sa_in;
98 struct sockaddr_in6 *sa_in6;
99 struct ypldap_addr *h;
101 TAILQ_FOREACH(h, &idm->idm_addr, next) {
102 switch (h->ss.ss_family) {
104 sa_in = (struct sockaddr_in *)&h->ss;
105 if (ntohs(sa_in->sin_port) == 0)
106 sa_in->sin_port = htons(LDAP_PORT);
107 idm->idm_state = STATE_DNS_DONE;
110 sa_in6 = (struct sockaddr_in6 *)&h->ss;
111 if (ntohs(sa_in6->sin6_port) == 0)
112 sa_in6->sin6_port = htons(LDAP_PORT);
113 idm->idm_state = STATE_DNS_DONE;
116 fatalx("king bula sez: wrong AF in client_addr_init");
125 client_addr_free(struct idm *idm)
127 struct ypldap_addr *h;
129 while (!TAILQ_EMPTY(&idm->idm_addr)) {
130 h = TAILQ_FIRST(&idm->idm_addr);
131 TAILQ_REMOVE(&idm->idm_addr, h, next);
139 client_sig_handler(int sig, short event, void *p)
147 fatalx("unexpected signal");
152 client_dispatch_dns(int fd, short events, void *p)
157 struct ypldap_addr *h;
163 struct imsgev *iev = env->sc_iev_dns;
164 struct imsgbuf *ibuf = &iev->ibuf;
166 if ((events & (EV_READ | EV_WRITE)) == 0)
167 fatalx("unknown event");
169 if (events & EV_READ) {
170 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
171 fatal("imsg_read error");
175 if (events & EV_WRITE) {
176 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
177 fatal("msgbuf_write");
184 if ((n = imsg_get(ibuf, &imsg)) == -1)
185 fatal("client_dispatch_dns: imsg_get error");
189 switch (imsg.hdr.type) {
191 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry)
192 if (idm->idm_id == imsg.hdr.peerid)
195 log_warnx("IMSG_HOST_DNS with invalid peerID");
198 if (!TAILQ_EMPTY(&idm->idm_addr)) {
199 log_warnx("IMSG_HOST_DNS but addrs set!");
203 dlen = imsg.hdr.len - IMSG_HEADER_SIZE;
204 if (dlen == 0) { /* no data -> temp error */
205 idm->idm_state = STATE_DNS_TEMPFAIL;
209 data = (u_char *)imsg.data;
210 while (dlen >= sizeof(struct sockaddr_storage)) {
211 if ((h = calloc(1, sizeof(*h))) == NULL)
213 memcpy(&h->ss, data, sizeof(h->ss));
214 TAILQ_INSERT_HEAD(&idm->idm_addr, h, next);
216 data += sizeof(h->ss);
217 dlen -= sizeof(h->ss);
220 fatalx("IMSG_HOST_DNS: dlen != 0");
222 client_addr_init(idm);
231 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) {
232 if (client_try_idm(env, idm) == -1)
233 idm->idm_state = STATE_LDAP_FAIL;
235 if (idm->idm_state < STATE_LDAP_DONE)
239 imsg_compose_event(env->sc_iev, IMSG_END_UPDATE, 0, 0, -1,
246 /* this pipe is dead, so remove the event handler */
248 event_loopexit(NULL);
253 client_dispatch_parent(int fd, short events, void *p)
259 struct imsgev *iev = env->sc_iev;
260 struct imsgbuf *ibuf = &iev->ibuf;
262 if ((events & (EV_READ | EV_WRITE)) == 0)
263 fatalx("unknown event");
265 if (events & EV_READ) {
266 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
267 fatal("imsg_read error");
271 if (events & EV_WRITE) {
272 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
273 fatal("msgbuf_write");
280 if ((n = imsg_get(ibuf, &imsg)) == -1)
281 fatal("client_dispatch_parent: imsg_get error");
285 switch (imsg.hdr.type) {
286 case IMSG_CONF_START: {
289 if (env->sc_flags & F_CONFIGURING) {
290 log_warnx("configuration already in progress");
293 memcpy(¶ms, imsg.data, sizeof(params));
294 log_debug("configuration starting");
295 env->sc_flags |= F_CONFIGURING;
297 memcpy(&env->sc_conf_tv, ¶ms.sc_conf_tv,
298 sizeof(env->sc_conf_tv));
299 env->sc_flags |= params.sc_flags;
302 case IMSG_CONF_IDM: {
305 if (!(env->sc_flags & F_CONFIGURING))
307 if ((idm = calloc(1, sizeof(*idm))) == NULL)
309 memcpy(idm, imsg.data, sizeof(*idm));
311 TAILQ_INSERT_TAIL(&env->sc_idms, idm, idm_entry);
315 env->sc_flags &= ~F_CONFIGURING;
316 log_debug("applying configuration");
317 client_configure(env);
320 log_debug("client_dispatch_parent: unexpect imsg %d",
332 /* this pipe is dead, so remove the event handler */
334 event_loopexit(NULL);
339 client_shutdown(void)
341 log_info("ldap client exiting");
346 ldapclient(int pipe_main2client[2])
351 struct event ev_sigint;
352 struct event ev_sigterm;
355 switch (pid = fork()) {
357 fatal("cannot fork");
365 memset(&env, 0, sizeof(env));
366 TAILQ_INIT(&env.sc_idms);
368 if ((pw = getpwnam(YPLDAP_USER)) == NULL)
371 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_dns) == -1)
373 ypldap_dns(pipe_dns, pw);
377 if (chroot(pw->pw_dir) == -1)
379 if (chdir("/") == -1)
382 #warning disabling chrooting in DEBUG mode
384 setproctitle("ldap client");
385 ypldap_process = PROC_CLIENT;
388 if (setgroups(1, &pw->pw_gid) ||
389 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
390 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
391 fatal("cannot drop privileges");
393 #warning disabling privilege revocation in DEBUG mode
397 signal(SIGPIPE, SIG_IGN);
398 signal_set(&ev_sigint, SIGINT, client_sig_handler, NULL);
399 signal_set(&ev_sigterm, SIGTERM, client_sig_handler, NULL);
400 signal_add(&ev_sigint, NULL);
401 signal_add(&ev_sigterm, NULL);
403 close(pipe_main2client[0]);
404 if ((env.sc_iev = calloc(1, sizeof(*env.sc_iev))) == NULL)
406 if ((env.sc_iev_dns = calloc(1, sizeof(*env.sc_iev_dns))) == NULL)
409 env.sc_iev->events = EV_READ;
410 env.sc_iev->data = &env;
411 imsg_init(&env.sc_iev->ibuf, pipe_main2client[1]);
412 env.sc_iev->handler = client_dispatch_parent;
413 event_set(&env.sc_iev->ev, env.sc_iev->ibuf.fd, env.sc_iev->events,
414 env.sc_iev->handler, &env);
415 event_add(&env.sc_iev->ev, NULL);
417 env.sc_iev_dns->events = EV_READ;
418 env.sc_iev_dns->data = &env;
419 imsg_init(&env.sc_iev_dns->ibuf, pipe_dns[0]);
420 env.sc_iev_dns->handler = client_dispatch_dns;
421 event_set(&env.sc_iev_dns->ev, env.sc_iev_dns->ibuf.fd,
422 env.sc_iev_dns->events, env.sc_iev_dns->handler, &env);
423 event_add(&env.sc_iev_dns->ev, NULL);
433 client_build_req(struct idm *idm, struct idm_req *ir, struct aldap_message *m,
434 int min_attr, int max_attr)
439 memset(ir, 0, sizeof(*ir));
440 for (i = min_attr; i < max_attr; i++) {
441 if (idm->idm_flags & F_FIXED_ATTR(i)) {
442 if (strlcat(ir->ir_line, idm->idm_attrs[i],
443 sizeof(ir->ir_line)) >= sizeof(ir->ir_line))
445 * entry yields a line > 1024, trash it.
450 ir->ir_key.ik_uid = strtonum(
451 idm->idm_attrs[i], 0,
453 } else if (i == ATTR_GR_GID) {
454 ir->ir_key.ik_gid = strtonum(
455 idm->idm_attrs[i], 0,
458 } else if (idm->idm_list & F_LIST(i)) {
459 aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs);
460 for (k = 0; k >= 0 && ldap_attrs && ldap_attrs[k] != NULL; k++) {
461 /* XXX: Fail when attributes have illegal characters e.g. ',' */
462 if (strlcat(ir->ir_line, ldap_attrs[k],
463 sizeof(ir->ir_line)) >= sizeof(ir->ir_line))
465 if (ldap_attrs[k+1] != NULL)
466 if (strlcat(ir->ir_line, ",",
468 >= sizeof(ir->ir_line)) {
469 aldap_free_attr(ldap_attrs);
473 aldap_free_attr(ldap_attrs);
475 if (aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs) == -1)
477 if (strlcat(ir->ir_line, ldap_attrs[0],
478 sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) {
479 aldap_free_attr(ldap_attrs);
483 ir->ir_key.ik_uid = strtonum(
484 ldap_attrs[0], 0, UID_MAX, NULL);
485 } else if (i == ATTR_GR_GID) {
486 ir->ir_key.ik_uid = strtonum(
487 ldap_attrs[0], 0, GID_MAX, NULL);
489 aldap_free_attr(ldap_attrs);
492 if (i + 1 != max_attr)
493 if (strlcat(ir->ir_line, ":",
494 sizeof(ir->ir_line)) >= sizeof(ir->ir_line))
502 client_search_idm(struct env *env, struct idm *idm, struct aldap *al,
503 char **attrs, char *filter, int min_attr, int max_attr,
507 struct aldap_message *m;
508 struct aldap_page_control *pg = NULL;
512 dn = idm->idm_basedn;
513 if (type == IMSG_GRP_ENTRY && idm->idm_groupdn[0] != '\0')
514 dn = idm->idm_groupdn;
517 if (aldap_search(al, dn, LDAP_SCOPE_SUBTREE,
518 filter, attrs, 0, 0, 0, pg) == -1) {
519 aldap_get_errno(al, &errstr);
520 log_debug("%s", errstr);
529 while ((m = aldap_parse(al)) != NULL) {
530 if (al->msgid != m->msgid) {
534 if (m->message_type == LDAP_RES_SEARCH_RESULT) {
535 if (m->page != NULL && m->page->cookie_len != 0)
544 if (m->message_type != LDAP_RES_SEARCH_ENTRY) {
548 if (client_build_req(idm, &ir, m, min_attr, max_attr) == 0)
549 imsg_compose_event(env->sc_iev, type, 0, 0, -1,
554 } while (pg != NULL);
568 client_try_idm(struct env *env, struct idm *idm)
571 char *attrs[ATTR_MAX+1];
573 struct aldap_message *m;
577 if ((al = client_aldap_open(&idm->idm_addr)) == NULL)
580 if (idm->idm_flags & F_NEEDAUTH) {
582 if (aldap_bind(al, idm->idm_binddn, idm->idm_bindcred) == -1)
586 if ((m = aldap_parse(al)) == NULL)
588 where = "verifying msgid";
589 if (al->msgid != m->msgid) {
596 memset(attrs, 0, sizeof(attrs));
597 for (i = 0, j = 0; i < ATTR_MAX; i++) {
598 if (idm->idm_flags & F_FIXED_ATTR(i))
600 attrs[j++] = idm->idm_attrs[i];
605 * build password line.
608 log_debug("searching password entries");
609 if (client_search_idm(env, idm, al, attrs,
610 idm->idm_filters[FILTER_USER], 0, ATTR_MAX, IMSG_PW_ENTRY) == -1)
613 memset(attrs, 0, sizeof(attrs));
614 for (i = ATTR_GR_MIN, j = 0; i < ATTR_GR_MAX; i++) {
615 if (idm->idm_flags & F_FIXED_ATTR(i))
617 attrs[j++] = idm->idm_attrs[i];
625 log_debug("searching group entries");
626 if (client_search_idm(env, idm, al, attrs,
627 idm->idm_filters[FILTER_GROUP], ATTR_GR_MIN, ATTR_GR_MAX,
628 IMSG_GRP_ENTRY) == -1)
633 idm->idm_state = STATE_LDAP_DONE;
638 log_debug("directory %s errored out in %s", idm->idm_name, where);
643 client_periodic_update(int fd, short event, void *p)
650 /* If LDAP isn't finished, notify the master process to trash the
652 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) {
653 if (idm->idm_state < STATE_LDAP_DONE)
656 idm->idm_state = STATE_NONE;
658 client_addr_free(idm);
661 log_debug("trash the update");
662 imsg_compose_event(env->sc_iev, IMSG_TRASH_UPDATE, 0, 0, -1,
666 client_configure(env);
670 client_configure(struct env *env)
676 log_debug("connecting to directories");
678 imsg_compose_event(env->sc_iev, IMSG_START_UPDATE, 0, 0, -1, NULL, 0);
680 /* Start the DNS lookups */
681 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) {
682 dlen = strlen(idm->idm_name) + 1;
683 imsg_compose_event(env->sc_iev_dns, IMSG_HOST_DNS, idm->idm_id,
684 0, -1, idm->idm_name, dlen);
687 tv.tv_sec = env->sc_conf_tv.tv_sec;
688 tv.tv_usec = env->sc_conf_tv.tv_usec;
689 evtimer_set(&env->sc_conf_ev, client_periodic_update, env);
690 evtimer_add(&env->sc_conf_ev, &tv);