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/*
* Copyright (c) 2014 Sunil Nimmagadda <sunil@nimmagadda.net>
*
* 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/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <bsd_auth.h>
#include <err.h>
#include <event.h>
#include <login_cap.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "imsgev.h"
#include "pop3d.h"
#define MBOX_PATH "/var/mail/%u"
#define MAILDIR_PATH "~/Maildir"
#define POP3D_USER "_pop3d"
static void authenticate(struct imsgev *, struct imsg *);
static void pop3e_imsgev(struct imsgev *, int , struct imsg *);
static void needfd(struct imsgev *);
static void sig_handler(int, short, void *);
static enum m_type m_type(const char *);
static void usage(void);
static struct imsgev iev_pop3e;
static const char *mpath;
static int mtype = M_MBOX;
int
main(int argc, char *argv[])
{
struct passwd *pw;
struct event ev_sigint, ev_sigterm, ev_sighup, ev_sigchld;
const char *path = NULL, *mtype_str = "mbox";
int ch, d = 0, pair[2];
while ((ch = getopt(argc, argv, "dp:t:")) != -1) {
switch (ch) {
case 'd':
d = 1;
break;
case 'p':
path = optarg;
break;
case 't':
if ((mtype = m_type(optarg)) == -1)
errx(1, "%s invalid argument", optarg);
mtype_str = optarg;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc > 0 || *argv)
usage();
if (path)
mpath = path;
else
mpath = (mtype == M_MAILDIR) ? MAILDIR_PATH : MBOX_PATH;
log_init(d);
if (geteuid())
fatalx("need root privileges");
if (!d && daemon(1, 0) == -1)
fatal("failed to daemonize");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) == -1)
fatal("socketpair");
set_nonblocking(pair[0]);
set_nonblocking(pair[1]);
if ((pw = getpwnam(POP3D_USER)) == NULL)
fatalx("main: getpwnam " POP3D_USER);
pop3_main(pair, pw);
close(pair[1]);
setproctitle("[priv]");
logit(LOG_INFO, "pop3d ready; type:%s, path:%s", mtype_str, mpath);
event_init();
signal_set(&ev_sigint, SIGINT, sig_handler, NULL);
signal_set(&ev_sighup, SIGHUP, sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, sig_handler, NULL);
signal_set(&ev_sigchld, SIGCHLD, sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sighup, NULL);
signal_add(&ev_sigterm, NULL);
signal_add(&ev_sigchld, NULL);
imsgev_init(&iev_pop3e, pair[0], NULL, pop3e_imsgev, needfd);
if (event_dispatch() < 0)
fatal("event_dispatch");
logit(LOG_INFO, "pop3d exiting");
return (0);
}
static void
pop3e_imsgev(struct imsgev *iev, int code, struct imsg *imsg)
{
switch (code) {
case IMSGEV_IMSG:
switch (imsg->hdr.type) {
case IMSG_AUTH:
authenticate(iev, imsg);
break;
default:
logit(LOG_DEBUG, "%s: unexpected imsg %u",
__func__, imsg->hdr.type);
break;
}
break;
case IMSGEV_EREAD:
case IMSGEV_EWRITE:
case IMSGEV_EIMSG:
fatal("pop3d: imsgev read/write error");
break;
case IMSGEV_DONE:
event_loopexit(NULL);
break;
}
}
static void
authenticate(struct imsgev *iev, struct imsg *imsg)
{
struct auth_req *req = imsg->data;
struct passwd *pw;
int pair[2];
if (auth_userokay(req->user, NULL, "auth-pop3", req->pass) == 0) {
logit(LOG_INFO, "%u: auth [%s] failed",
imsg->hdr.peerid, req->user);
pair[0] = -1;
goto end;
}
logit(LOG_INFO, "%u: auth [%s] passed", imsg->hdr.peerid,
req->user);
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) == -1)
fatal("socketpair");
set_nonblocking(pair[0]);
set_nonblocking(pair[1]);
if ((pw = getpwnam(req->user)) == NULL)
fatalx("authenticate: getpwnam");
if (maildrop_init(imsg->hdr.peerid, pair, pw, mtype, mpath) == -1) {
logit(LOG_INFO, "%u: unable to fork maildrop process",
imsg->hdr.peerid);
pair[0] = -1;
goto end;
}
close(pair[1]);
end:
imsgev_xcompose(iev, IMSG_AUTH, imsg->hdr.peerid, 0,
pair[0], NULL, 0, "authenticate");
}
static void
needfd(struct imsgev *iev)
{
fatalx("pop3d should never need an fd");
}
static void
sig_handler(int sig, short event, void *arg)
{
int status;
switch (sig) {
case SIGINT:
case SIGHUP:
case SIGTERM:
imsgev_clear(&iev_pop3e);
event_loopexit(NULL);
break;
case SIGCHLD:
if (waitpid(WAIT_ANY, &status, WNOHANG) > 0)
if ((WIFEXITED(status) && WEXITSTATUS(status) != 0) ||
WIFSIGNALED(status)) {
logit(LOG_ERR, "Lost pop3 engine");
event_loopexit(NULL);
}
break;
}
}
static enum m_type
m_type(const char *str)
{
if (strcasecmp(str, "mbox") == 0)
return M_MBOX;
if (strcasecmp(str, "maildir") == 0)
return M_MAILDIR;
return (-1);
}
static void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-d] [-p path] [-t type]\n", __progname);
exit(EXIT_FAILURE);
}
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