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/* $OpenBSD: forward.c,v 1.12 2009/02/22 11:44:29 form Exp $ */
/*
* Copyright (c) 2008 Gilles Chehade <gilles@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/queue.h>
#include <sys/tree.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <event.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "smtpd.h"
int
forwards_get(struct aliaseslist *aliases, char *username)
{
FILE *fp;
struct alias alias;
struct alias *aliasp;
char pathname[MAXPATHLEN];
char *buf, *lbuf, *p, *cp;
size_t len;
struct stat sb;
struct passwd *pw;
size_t nbaliases = 0;
int quoted;
pw = safe_getpwnam(username);
if (pw == NULL)
return 0;
if (! bsnprintf(pathname, sizeof(pathname), "%s/.forward", pw->pw_dir))
return 0;
fp = fopen(pathname, "r");
if (fp == NULL)
return 0;
log_debug("+ opening forward file %s", pathname);
/* make sure ~/ is not writable by anyone but owner */
if (stat(pw->pw_dir, &sb) == -1)
goto bad;
if (sb.st_uid != pw->pw_uid || sb.st_mode & (S_IWGRP|S_IWOTH))
goto bad;
/* make sure ~/.forward is not writable by anyone but owner */
if (fstat(fileno(fp), &sb) == -1)
goto bad;
if (sb.st_uid != pw->pw_uid || sb.st_mode & (S_IWGRP|S_IWOTH))
goto bad;
lbuf = NULL;
while ((buf = fgetln(fp, &len))) {
if (buf[len - 1] == '\n')
buf[len - 1] = '\0';
else {
/* EOF without EOL, copy and add the NUL */
if ((lbuf = malloc(len + 1)) == NULL)
fatal("malloc");
memcpy(lbuf, buf, len);
lbuf[len] = '\0';
buf = lbuf;
}
/* ignore empty lines and comments */
if (buf[0] == '#' || buf[0] == '\0')
continue;
quoted = 0;
cp = buf;
do {
/* skip whitespace */
while (isspace(*cp))
cp++;
/* parse line */
for (p = cp; *p != '\0'; p++) {
if (*p == ',' && !quoted) {
*p++ = '\0';
break;
} else if (*p == '"')
quoted = !quoted;
}
buf = cp;
cp = p;
log_debug("\tforward: %s", buf);
if (! alias_parse(&alias, buf)) {
log_debug("bad entry in ~/.forward");
continue;
}
if (alias.type == ALIAS_INCLUDE) {
log_debug(
"includes are forbidden in ~/.forward");
continue;
}
aliasp = calloc(1, sizeof(struct alias));
if (aliasp == NULL)
fatal("calloc");
*aliasp = alias;
TAILQ_INSERT_HEAD(aliases, aliasp, entry);
nbaliases++;
} while (*cp != '\0');
}
free(lbuf);
fclose(fp);
return (nbaliases);
bad:
log_debug("+ forward file error, probably bad perms/mode");
if (fp != NULL)
fclose(fp);
return (0);
}
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