1 /* $OpenBSD: ldapclient.c,v 1.31 2014/11/16 23:24:44 tedu Exp $ */
5 * Copyright (c) 2008 Alexander Schrijver <aschrijver@openbsd.org>
6 * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
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.
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.
21 #include <sys/types.h>
22 #include <sys/param.h>
23 #include <sys/queue.h>
24 #include <sys/socket.h>
27 #include <netinet/in.h>
28 #include <arpa/inet.h>
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 *,
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 *);
60 struct aldap *client_aldap_open(struct ypldap_addr_list *);
63 * dummy wrapper to provide aldap_init with its fd's.
66 client_aldap_open(struct ypldap_addr_list *addr)
69 struct ypldap_addr *p;
71 TAILQ_FOREACH(p, addr, next) {
72 char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
73 struct sockaddr *sa = (struct sockaddr *)&p->ss;
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");
79 if ((fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0)
82 if (connect(fd, sa, sa->sa_len) == 0)
85 warn("connect to %s port %s (%s) failed", hbuf, sbuf, "tcp");
92 return aldap_init(fd);
96 client_addr_init(struct idm *idm)
98 struct sockaddr_in *sa_in;
99 struct sockaddr_in6 *sa_in6;
100 struct ypldap_addr *h;
102 TAILQ_FOREACH(h, &idm->idm_addr, next) {
103 switch (h->ss.ss_family) {
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;
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;
117 fatalx("king bula sez: wrong AF in client_addr_init");
126 client_addr_free(struct idm *idm)
128 struct ypldap_addr *h;
130 while (!TAILQ_EMPTY(&idm->idm_addr)) {
131 h = TAILQ_FIRST(&idm->idm_addr);
132 TAILQ_REMOVE(&idm->idm_addr, h, next);
140 client_sig_handler(int sig, short event, void *p)
148 fatalx("unexpected signal");
153 client_dispatch_dns(int fd, short events, void *p)
158 struct ypldap_addr *h;
164 struct imsgev *iev = env->sc_iev_dns;
165 struct imsgbuf *ibuf = &iev->ibuf;
167 if ((events & (EV_READ | EV_WRITE)) == 0)
168 fatalx("unknown event");
170 if (events & EV_READ) {
171 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
172 fatal("imsg_read error");
176 if (events & EV_WRITE) {
177 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
178 fatal("msgbuf_write");
185 if ((n = imsg_get(ibuf, &imsg)) == -1)
186 fatal("client_dispatch_dns: imsg_get error");
190 switch (imsg.hdr.type) {
192 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry)
193 if (idm->idm_id == imsg.hdr.peerid)
196 log_warnx("IMSG_HOST_DNS with invalid peerID");
199 if (!TAILQ_EMPTY(&idm->idm_addr)) {
200 log_warnx("IMSG_HOST_DNS but addrs set!");
204 dlen = imsg.hdr.len - IMSG_HEADER_SIZE;
205 if (dlen == 0) { /* no data -> temp error */
206 idm->idm_state = STATE_DNS_TEMPFAIL;
210 data = (u_char *)imsg.data;
211 while (dlen >= sizeof(struct sockaddr_storage)) {
212 if ((h = calloc(1, sizeof(*h))) == NULL)
214 memcpy(&h->ss, data, sizeof(h->ss));
215 TAILQ_INSERT_HEAD(&idm->idm_addr, h, next);
217 data += sizeof(h->ss);
218 dlen -= sizeof(h->ss);
221 fatalx("IMSG_HOST_DNS: dlen != 0");
223 client_addr_init(idm);
232 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) {
233 if (client_try_idm(env, idm) == -1)
234 idm->idm_state = STATE_LDAP_FAIL;
236 if (idm->idm_state < STATE_LDAP_DONE)
240 imsg_compose_event(env->sc_iev, IMSG_END_UPDATE, 0, 0, -1,
247 /* this pipe is dead, so remove the event handler */
249 event_loopexit(NULL);
254 client_dispatch_parent(int fd, short events, void *p)
260 struct imsgev *iev = env->sc_iev;
261 struct imsgbuf *ibuf = &iev->ibuf;
263 if ((events & (EV_READ | EV_WRITE)) == 0)
264 fatalx("unknown event");
266 if (events & EV_READ) {
267 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
268 fatal("imsg_read error");
272 if (events & EV_WRITE) {
273 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
274 fatal("msgbuf_write");
281 if ((n = imsg_get(ibuf, &imsg)) == -1)
282 fatal("client_dispatch_parent: imsg_get error");
286 switch (imsg.hdr.type) {
287 case IMSG_CONF_START: {
290 if (env->sc_flags & F_CONFIGURING) {
291 log_warnx("configuration already in progress");
294 memcpy(¶ms, imsg.data, sizeof(params));
295 log_debug("configuration starting");
296 env->sc_flags |= F_CONFIGURING;
298 memcpy(&env->sc_conf_tv, ¶ms.sc_conf_tv,
299 sizeof(env->sc_conf_tv));
300 env->sc_flags |= params.sc_flags;
303 case IMSG_CONF_IDM: {
306 if (!(env->sc_flags & F_CONFIGURING))
308 if ((idm = calloc(1, sizeof(*idm))) == NULL)
310 memcpy(idm, imsg.data, sizeof(*idm));
312 TAILQ_INSERT_TAIL(&env->sc_idms, idm, idm_entry);
316 env->sc_flags &= ~F_CONFIGURING;
317 log_debug("applying configuration");
318 client_configure(env);
321 log_debug("client_dispatch_parent: unexpect imsg %d",
333 /* this pipe is dead, so remove the event handler */
335 event_loopexit(NULL);
340 client_shutdown(void)
342 log_info("ldap client exiting");
347 ldapclient(int pipe_main2client[2])
352 struct event ev_sigint;
353 struct event ev_sigterm;
356 switch (pid = fork()) {
358 fatal("cannot fork");
366 memset(&env, 0, sizeof(env));
367 TAILQ_INIT(&env.sc_idms);
369 if ((pw = getpwnam(YPLDAP_USER)) == NULL)
372 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_dns) == -1)
374 dns_pid = ypldap_dns(pipe_dns, pw);
378 if (chroot(pw->pw_dir) == -1)
380 if (chdir("/") == -1)
383 #warning disabling chrooting in DEBUG mode
385 setproctitle("ldap client");
386 ypldap_process = PROC_CLIENT;
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");
394 #warning disabling privilege revocation in DEBUG mode
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);
404 close(pipe_main2client[0]);
405 if ((env.sc_iev = calloc(1, sizeof(*env.sc_iev))) == NULL)
407 if ((env.sc_iev_dns = calloc(1, sizeof(*env.sc_iev_dns))) == NULL)
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);
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);
434 client_build_req(struct idm *idm, struct idm_req *ir, struct aldap_message *m,
435 int min_attr, int max_attr)
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))
446 * entry yields a line > 1024, trash it.
451 ir->ir_key.ik_uid = strtonum(
452 idm->idm_attrs[i], 0,
454 } else if (i == ATTR_GR_GID) {
455 ir->ir_key.ik_gid = strtonum(
456 idm->idm_attrs[i], 0,
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))
466 if (ldap_attrs[k+1] != NULL)
467 if (strlcat(ir->ir_line, ",",
469 >= sizeof(ir->ir_line)) {
470 aldap_free_attr(ldap_attrs);
474 aldap_free_attr(ldap_attrs);
476 if (aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs) == -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);
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);
490 aldap_free_attr(ldap_attrs);
493 if (i + 1 != max_attr)
494 if (strlcat(ir->ir_line, ":",
495 sizeof(ir->ir_line)) >= sizeof(ir->ir_line))
503 client_search_idm(struct env *env, struct idm *idm, struct aldap *al,
504 char **attrs, char *filter, int min_attr, int max_attr,
508 struct aldap_message *m;
509 struct aldap_page_control *pg = NULL;
513 dn = idm->idm_basedn;
514 if (type == IMSG_GRP_ENTRY && idm->idm_groupdn[0] != '\0')
515 dn = idm->idm_groupdn;
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);
530 while ((m = aldap_parse(al)) != NULL) {
531 if (al->msgid != m->msgid) {
535 if (m->message_type == LDAP_RES_SEARCH_RESULT) {
536 if (m->page != NULL && m->page->cookie_len != 0)
545 if (m->message_type != LDAP_RES_SEARCH_ENTRY) {
549 if (client_build_req(idm, &ir, m, min_attr, max_attr) == 0)
550 imsg_compose_event(env->sc_iev, type, 0, 0, -1,
555 } while (pg != NULL);
569 client_try_idm(struct env *env, struct idm *idm)
572 char *attrs[ATTR_MAX+1];
574 struct aldap_message *m;
578 if ((al = client_aldap_open(&idm->idm_addr)) == NULL)
581 if (idm->idm_flags & F_NEEDAUTH) {
583 if (aldap_bind(al, idm->idm_binddn, idm->idm_bindcred) == -1)
587 if ((m = aldap_parse(al)) == NULL)
589 where = "verifying msgid";
590 if (al->msgid != m->msgid) {
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))
601 attrs[j++] = idm->idm_attrs[i];
606 * build password line.
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)
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))
618 attrs[j++] = idm->idm_attrs[i];
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)
634 idm->idm_state = STATE_LDAP_DONE;
639 log_debug("directory %s errored out in %s", idm->idm_name, where);
644 client_periodic_update(int fd, short event, void *p)
651 /* If LDAP isn't finished, notify the master process to trash the
653 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) {
654 if (idm->idm_state < STATE_LDAP_DONE)
657 idm->idm_state = STATE_NONE;
659 client_addr_free(idm);
662 log_debug("trash the update");
663 imsg_compose_event(env->sc_iev, IMSG_TRASH_UPDATE, 0, 0, -1,
667 client_configure(env);
671 client_configure(struct env *env)
677 log_debug("connecting to directories");
679 imsg_compose_event(env->sc_iev, IMSG_START_UPDATE, 0, 0, -1, NULL, 0);
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);
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);