/* $OpenBSD: ldapclient.c,v 1.31 2014/11/16 23:24:44 tedu Exp $ */
/*
* Copyright (c) 2008 Alexander Schrijver <aschrijver@openbsd.org>
* Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/tree.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <err.h>
#include <event.h>
#include <fcntl.h>
#include <unistd.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aldap.h"
#include "ypldap.h"
void client_sig_handler(int, short, void *);
void client_dispatch_dns(int, short, void *);
void client_dispatch_parent(int, short, void *);
void client_shutdown(void);
void client_connect(int, short, void *);
void client_configure(struct env *);
void client_periodic_update(int, short, void *);
int client_build_req(struct idm *, struct idm_req *, struct aldap_message *,
int, int);
int client_search_idm(struct env *, struct idm *, struct aldap *,
char **, char *, int, int, enum imsg_type);
int client_try_idm(struct env *, struct idm *);
int client_addr_init(struct idm *);
int client_addr_free(struct idm *);
struct aldap *client_aldap_open(struct ypldap_addr_list *);
/*
* dummy wrapper to provide aldap_init with its fd's.
*/
struct aldap *
client_aldap_open(struct ypldap_addr_list *addr)
{
int fd = -1;
struct ypldap_addr *p;
TAILQ_FOREACH(p, addr, next) {
char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
struct sockaddr *sa = (struct sockaddr *)&p->ss;
if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), sbuf,
sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV))
errx(1, "could not get numeric hostname");
if ((fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0)
return NULL;
if (connect(fd, sa, sa->sa_len) == 0)
break;
warn("connect to %s port %s (%s) failed", hbuf, sbuf, "tcp");
close(fd);
}
if (fd == -1)
return NULL;
return aldap_init(fd);
}
int
client_addr_init(struct idm *idm)
{
struct sockaddr_in *sa_in;
struct sockaddr_in6 *sa_in6;
struct ypldap_addr *h;
TAILQ_FOREACH(h, &idm->idm_addr, next) {
switch (h->ss.ss_family) {
case AF_INET:
sa_in = (struct sockaddr_in *)&h->ss;
if (ntohs(sa_in->sin_port) == 0)
sa_in->sin_port = htons(LDAP_PORT);
idm->idm_state = STATE_DNS_DONE;
break;
case AF_INET6:
sa_in6 = (struct sockaddr_in6 *)&h->ss;
if (ntohs(sa_in6->sin6_port) == 0)
sa_in6->sin6_port = htons(LDAP_PORT);
idm->idm_state = STATE_DNS_DONE;
break;
default:
fatalx("king bula sez: wrong AF in client_addr_init");
/* not reached */
}
}
return (0);
}
int
client_addr_free(struct idm *idm)
{
struct ypldap_addr *h;
while (!TAILQ_EMPTY(&idm->idm_addr)) {
h = TAILQ_FIRST(&idm->idm_addr);
TAILQ_REMOVE(&idm->idm_addr, h, next);
free(h);
}
return (0);
}
void
client_sig_handler(int sig, short event, void *p)
{
switch (sig) {
case SIGINT:
case SIGTERM:
client_shutdown();
break;
default:
fatalx("unexpected signal");
}
}
void
client_dispatch_dns(int fd, short events, void *p)
{
struct imsg imsg;
u_int16_t dlen;
u_char *data;
struct ypldap_addr *h;
int n, wait_cnt = 0;
struct idm *idm;
int shut = 0;
struct env *env = p;
struct imsgev *iev = env->sc_iev_dns;
struct imsgbuf *ibuf = &iev->ibuf;
if ((events & (EV_READ | EV_WRITE)) == 0)
fatalx("unknown event");
if (events & EV_READ) {
if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
fatal("imsg_read error");
if (n == 0)
shut = 1;
}
if (events & EV_WRITE) {
if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
fatal("msgbuf_write");
if (n == 0)
shut = 1;
goto done;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("client_dispatch_dns: imsg_get error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_HOST_DNS:
TAILQ_FOREACH(idm, &env->sc_idms, idm_entry)
if (idm->idm_id == imsg.hdr.peerid)
break;
if (idm == NULL) {
log_warnx("IMSG_HOST_DNS with invalid peerID");
break;
}
if (!TAILQ_EMPTY(&idm->idm_addr)) {
log_warnx("IMSG_HOST_DNS but addrs set!");
break;
}
dlen = imsg.hdr.len - IMSG_HEADER_SIZE;
if (dlen == 0) { /* no data -> temp error */
idm->idm_state = STATE_DNS_TEMPFAIL;
break;
}
data = (u_char *)imsg.data;
while (dlen >= sizeof(struct sockaddr_storage)) {
if ((h = calloc(1, sizeof(*h))) == NULL)
fatal(NULL);
memcpy(&h->ss, data, sizeof(h->ss));
TAILQ_INSERT_HEAD(&idm->idm_addr, h, next);
data += sizeof(h->ss);
dlen -= sizeof(h->ss);
}
if (dlen != 0)
fatalx("IMSG_HOST_DNS: dlen != 0");
client_addr_init(idm);
break;
default:
break;
}
imsg_free(&imsg);
}
TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) {
if (client_try_idm(env, idm) == -1)
idm->idm_state = STATE_LDAP_FAIL;
if (idm->idm_state < STATE_LDAP_DONE)
wait_cnt++;
}
if (wait_cnt == 0)
imsg_compose_event(env->sc_iev, IMSG_END_UPDATE, 0, 0, -1,
NULL, 0);
done:
if (!shut)
imsg_event_add(iev);
else {
/* this pipe is dead, so remove the event handler */
event_del(&iev->ev);
event_loopexit(NULL);
}
}
void
client_dispatch_parent(int fd, short events, void *p)
{
int n;
int shut = 0;
struct imsg imsg;
struct env *env = p;
struct imsgev *iev = env->sc_iev;
struct imsgbuf *ibuf = &iev->ibuf;
if ((events & (EV_READ | EV_WRITE)) == 0)
fatalx("unknown event");
if (events & EV_READ) {
if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
fatal("imsg_read error");
if (n == 0)
shut = 1;
}
if (events & EV_WRITE) {
if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
fatal("msgbuf_write");
if (n == 0)
shut = 1;
goto done;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("client_dispatch_parent: imsg_get error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CONF_START: {
struct env params;
if (env->sc_flags & F_CONFIGURING) {
log_warnx("configuration already in progress");
break;
}
memcpy(¶ms, imsg.data, sizeof(params));
log_debug("configuration starting");
env->sc_flags |= F_CONFIGURING;
purge_config(env);
memcpy(&env->sc_conf_tv, ¶ms.sc_conf_tv,
sizeof(env->sc_conf_tv));
env->sc_flags |= params.sc_flags;
break;
}
case IMSG_CONF_IDM: {
struct idm *idm;
if (!(env->sc_flags & F_CONFIGURING))
break;
if ((idm = calloc(1, sizeof(*idm))) == NULL)
fatal(NULL);
memcpy(idm, imsg.data, sizeof(*idm));
idm->idm_env = env;
TAILQ_INSERT_TAIL(&env->sc_idms, idm, idm_entry);
break;
}
case IMSG_CONF_END:
env->sc_flags &= ~F_CONFIGURING;
log_debug("applying configuration");
client_configure(env);
break;
default:
log_debug("client_dispatch_parent: unexpect imsg %d",
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
done:
if (!shut)
imsg_event_add(iev);
else {
/* this pipe is dead, so remove the event handler */
event_del(&iev->ev);
event_loopexit(NULL);
}
}
void
client_shutdown(void)
{
log_info("ldap client exiting");
_exit(0);
}
pid_t
ldapclient(int pipe_main2client[2])
{
pid_t pid;
int pipe_dns[2];
struct passwd *pw;
struct event ev_sigint;
struct event ev_sigterm;
struct env env;
switch (pid = fork()) {
case -1:
fatal("cannot fork");
break;
case 0:
break;
default:
return (pid);
}
memset(&env, 0, sizeof(env));
TAILQ_INIT(&env.sc_idms);
if ((pw = getpwnam(YPLDAP_USER)) == NULL)
fatal("getpwnam");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_dns) == -1)
fatal("socketpair");
ypldap_dns(pipe_dns, pw);
close(pipe_dns[1]);
#ifndef DEBUG
if (chroot(pw->pw_dir) == -1)
fatal("chroot");
if (chdir("/") == -1)
fatal("chdir");
#else
#warning disabling chrooting in DEBUG mode
#endif
setproctitle("ldap client");
ypldap_process = PROC_CLIENT;
#ifndef DEBUG
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
fatal("cannot drop privileges");
#else
#warning disabling privilege revocation in DEBUG mode
#endif
event_init();
signal(SIGPIPE, SIG_IGN);
signal_set(&ev_sigint, SIGINT, client_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, client_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
close(pipe_main2client[0]);
if ((env.sc_iev = calloc(1, sizeof(*env.sc_iev))) == NULL)
fatal(NULL);
if ((env.sc_iev_dns = calloc(1, sizeof(*env.sc_iev_dns))) == NULL)
fatal(NULL);
env.sc_iev->events = EV_READ;
env.sc_iev->data = &env;
imsg_init(&env.sc_iev->ibuf, pipe_main2client[1]);
env.sc_iev->handler = client_dispatch_parent;
event_set(&env.sc_iev->ev, env.sc_iev->ibuf.fd, env.sc_iev->events,
env.sc_iev->handler, &env);
event_add(&env.sc_iev->ev, NULL);
env.sc_iev_dns->events = EV_READ;
env.sc_iev_dns->data = &env;
imsg_init(&env.sc_iev_dns->ibuf, pipe_dns[0]);
env.sc_iev_dns->handler = client_dispatch_dns;
event_set(&env.sc_iev_dns->ev, env.sc_iev_dns->ibuf.fd,
env.sc_iev_dns->events, env.sc_iev_dns->handler, &env);
event_add(&env.sc_iev_dns->ev, NULL);
event_dispatch();
client_shutdown();
return (0);
}
int
client_build_req(struct idm *idm, struct idm_req *ir, struct aldap_message *m,
int min_attr, int max_attr)
{
char **ldap_attrs;
int i, k;
memset(ir, 0, sizeof(*ir));
for (i = min_attr; i < max_attr; i++) {
if (idm->idm_flags & F_FIXED_ATTR(i)) {
if (strlcat(ir->ir_line, idm->idm_attrs[i],
sizeof(ir->ir_line)) >= sizeof(ir->ir_line))
/*
* entry yields a line > 1024, trash it.
*/
return (-1);
if (i == ATTR_UID) {
ir->ir_key.ik_uid = strtonum(
idm->idm_attrs[i], 0,
UID_MAX, NULL);
} else if (i == ATTR_GR_GID) {
ir->ir_key.ik_gid = strtonum(
idm->idm_attrs[i], 0,
GID_MAX, NULL);
}
} else if (idm->idm_list & F_LIST(i)) {
aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs);
for (k = 0; k >= 0 && ldap_attrs && ldap_attrs[k] != NULL; k++) {
/* XXX: Fail when attributes have illegal characters e.g. ',' */
if (strlcat(ir->ir_line, ldap_attrs[k],
sizeof(ir->ir_line)) >= sizeof(ir->ir_line))
continue;
if (ldap_attrs[k+1] != NULL)
if (strlcat(ir->ir_line, ",",
sizeof(ir->ir_line))
>= sizeof(ir->ir_line)) {
aldap_free_attr(ldap_attrs);
return (-1);
}
}
aldap_free_attr(ldap_attrs);
} else {
if (aldap_match_attr(m, idm->idm_attrs[i], &ldap_attrs) == -1)
return (-1);
if (strlcat(ir->ir_line, ldap_attrs[0],
sizeof(ir->ir_line)) >= sizeof(ir->ir_line)) {
aldap_free_attr(ldap_attrs);
return (-1);
}
if (i == ATTR_UID) {
ir->ir_key.ik_uid = strtonum(
ldap_attrs[0], 0, UID_MAX, NULL);
} else if (i == ATTR_GR_GID) {
ir->ir_key.ik_uid = strtonum(
ldap_attrs[0], 0, GID_MAX, NULL);
}
aldap_free_attr(ldap_attrs);
}
if (i + 1 != max_attr)
if (strlcat(ir->ir_line, ":",
sizeof(ir->ir_line)) >= sizeof(ir->ir_line))
return (-1);
}
return (0);
}
int
client_search_idm(struct env *env, struct idm *idm, struct aldap *al,
char **attrs, char *filter, int min_attr, int max_attr,
enum imsg_type type)
{
struct idm_req ir;
struct aldap_message *m;
struct aldap_page_control *pg = NULL;
const char *errstr;
char *dn;
dn = idm->idm_basedn;
if (type == IMSG_GRP_ENTRY && idm->idm_groupdn[0] != '\0')
dn = idm->idm_groupdn;
do {
if (aldap_search(al, dn, LDAP_SCOPE_SUBTREE,
filter, attrs, 0, 0, 0, pg) == -1) {
aldap_get_errno(al, &errstr);
log_debug("%s", errstr);
return (-1);
}
if (pg != NULL) {
aldap_freepage(pg);
pg = NULL;
}
while ((m = aldap_parse(al)) != NULL) {
if (al->msgid != m->msgid) {
goto fail;
}
if (m->message_type == LDAP_RES_SEARCH_RESULT) {
if (m->page != NULL && m->page->cookie_len != 0)
pg = m->page;
else
pg = NULL;
aldap_freemsg(m);
break;
}
if (m->message_type != LDAP_RES_SEARCH_ENTRY) {
goto fail;
}
if (client_build_req(idm, &ir, m, min_attr, max_attr) == 0)
imsg_compose_event(env->sc_iev, type, 0, 0, -1,
&ir, sizeof(ir));
aldap_freemsg(m);
}
} while (pg != NULL);
return (0);
fail:
aldap_freemsg(m);
if (pg != NULL) {
aldap_freepage(pg);
}
return (-1);
}
int
client_try_idm(struct env *env, struct idm *idm)
{
const char *where;
char *attrs[ATTR_MAX+1];
int i, j;
struct aldap_message *m;
struct aldap *al;
where = "connect";
if ((al = client_aldap_open(&idm->idm_addr)) == NULL)
return (-1);
if (idm->idm_flags & F_NEEDAUTH) {
where = "binding";
if (aldap_bind(al, idm->idm_binddn, idm->idm_bindcred) == -1)
goto bad;
where = "parsing";
if ((m = aldap_parse(al)) == NULL)
goto bad;
where = "verifying msgid";
if (al->msgid != m->msgid) {
aldap_freemsg(m);
goto bad;
}
aldap_freemsg(m);
}
memset(attrs, 0, sizeof(attrs));
for (i = 0, j = 0; i < ATTR_MAX; i++) {
if (idm->idm_flags & F_FIXED_ATTR(i))
continue;
attrs[j++] = idm->idm_attrs[i];
}
attrs[j] = NULL;
/*
* build password line.
*/
where = "search";
log_debug("searching password entries");
if (client_search_idm(env, idm, al, attrs,
idm->idm_filters[FILTER_USER], 0, ATTR_MAX, IMSG_PW_ENTRY) == -1)
goto bad;
memset(attrs, 0, sizeof(attrs));
for (i = ATTR_GR_MIN, j = 0; i < ATTR_GR_MAX; i++) {
if (idm->idm_flags & F_FIXED_ATTR(i))
continue;
attrs[j++] = idm->idm_attrs[i];
}
attrs[j] = NULL;
/*
* build group line.
*/
where = "search";
log_debug("searching group entries");
if (client_search_idm(env, idm, al, attrs,
idm->idm_filters[FILTER_GROUP], ATTR_GR_MIN, ATTR_GR_MAX,
IMSG_GRP_ENTRY) == -1)
goto bad;
aldap_close(al);
idm->idm_state = STATE_LDAP_DONE;
return (0);
bad:
aldap_close(al);
log_debug("directory %s errored out in %s", idm->idm_name, where);
return (-1);
}
void
client_periodic_update(int fd, short event, void *p)
{
struct env *env = p;
struct idm *idm;
int fail_cnt = 0;
/* If LDAP isn't finished, notify the master process to trash the
* update. */
TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) {
if (idm->idm_state < STATE_LDAP_DONE)
fail_cnt++;
idm->idm_state = STATE_NONE;
client_addr_free(idm);
}
if (fail_cnt > 0) {
log_debug("trash the update");
imsg_compose_event(env->sc_iev, IMSG_TRASH_UPDATE, 0, 0, -1,
NULL, 0);
}
client_configure(env);
}
void
client_configure(struct env *env)
{
struct timeval tv;
struct idm *idm;
u_int16_t dlen;
log_debug("connecting to directories");
imsg_compose_event(env->sc_iev, IMSG_START_UPDATE, 0, 0, -1, NULL, 0);
/* Start the DNS lookups */
TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) {
dlen = strlen(idm->idm_name) + 1;
imsg_compose_event(env->sc_iev_dns, IMSG_HOST_DNS, idm->idm_id,
0, -1, idm->idm_name, dlen);
}
tv.tv_sec = env->sc_conf_tv.tv_sec;
tv.tv_usec = env->sc_conf_tv.tv_usec;
evtimer_set(&env->sc_conf_ev, client_periodic_update, env);
evtimer_add(&env->sc_conf_ev, &tv);
}
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