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