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/* $OpenBSD: table_passwd.c,v 1.11 2015/10/11 12:50:00 sunil Exp $ */
/*
* Copyright (c) 2013 Gilles Chehade <gilles@poolp.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/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <err.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <unistd.h>
#include "smtpd-defines.h"
#include "smtpd-api.h"
#include "log.h"
static int table_passwd_update(void);
static int table_passwd_check(int, struct dict *, const char *);
static int table_passwd_lookup(int, struct dict *, const char *, char *, size_t);
static int table_passwd_fetch(int, struct dict *, char *, size_t);
static int parse_passwd_entry(struct passwd *, char *);
static char *config;
static struct dict *passwd;
int
main(int argc, char **argv)
{
int ch;
log_init(1);
while ((ch = getopt(argc, argv, "")) != -1) {
switch (ch) {
default:
log_warnx("warn: table-passwd: bad option");
return (1);
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
log_warnx("warn: table-passwd: bogus argument(s)");
return (1);
}
config = argv[0];
if (table_passwd_update() == 0) {
log_warnx("warn: table-passwd: error parsing config file");
return (1);
}
table_api_on_update(table_passwd_update);
table_api_on_check(table_passwd_check);
table_api_on_lookup(table_passwd_lookup);
table_api_on_fetch(table_passwd_fetch);
table_api_dispatch();
return (0);
}
static int
table_passwd_update(void)
{
FILE *fp;
char *buf = NULL, *p;
char tmp[LINE_MAX];
size_t sz = 0;
ssize_t len;
char *line;
struct passwd pw;
struct dict *npasswd;
/* Parse configuration */
fp = fopen(config, "r");
if (fp == NULL)
return (0);
npasswd = calloc(1, sizeof *passwd);
if (npasswd == NULL)
goto err;
dict_init(npasswd);
while ((len = getline(&buf, &sz, fp)) != -1) {
if (buf[len - 1] == '\n')
buf[len - 1] = '\0';
if (strlcpy(tmp, buf, sizeof tmp) >= sizeof tmp) {
log_warnx("warn: table-passwd: line too long");
goto err;
}
if (! parse_passwd_entry(&pw, tmp)) {
log_warnx("warn: table-passwd: invalid entry");
goto err;
}
if ((line = strdup(buf)) == NULL)
err(1, NULL);
dict_set(npasswd, pw.pw_name, line);
}
fclose(fp);
/* swap passwd table and release old one*/
if (passwd)
while (dict_poproot(passwd, (void**)&p))
free(p);
passwd = npasswd;
return (1);
err:
if (fp)
fclose(fp);
free(buf);
/* release passwd table */
if (npasswd) {
while (dict_poproot(npasswd, (void**)&p))
free(p);
free(npasswd);
}
return (0);
}
static int
table_passwd_check(int service, struct dict *params, const char *key)
{
return (-1);
}
static int
table_passwd_lookup(int service, struct dict *params, const char *key, char *dst, size_t sz)
{
int r;
struct passwd pw;
char *line;
char tmp[LINE_MAX];
line = dict_get(passwd, key);
if (line == NULL)
return 0;
(void)strlcpy(tmp, line, sizeof tmp);
if (! parse_passwd_entry(&pw, tmp)) {
log_warnx("warn: table-passwd: invalid entry");
return -1;
}
r = 1;
switch (service) {
case K_CREDENTIALS:
if (snprintf(dst, sz, "%s:%s",
pw.pw_name, pw.pw_passwd) >= (ssize_t)sz) {
log_warnx("warn: table-passwd: result too large");
r = -1;
}
break;
case K_USERINFO:
if (snprintf(dst, sz, "%d:%d:%s",
pw.pw_uid, pw.pw_gid, pw.pw_dir)
>= (ssize_t)sz) {
log_warnx("warn: table-passwd: result too large");
r = -1;
}
break;
default:
log_warnx("warn: table-passwd: unknown service %d",
service);
r = -1;
}
return (r);
}
static int
table_passwd_fetch(int service, struct dict *params, char *dst, size_t sz)
{
return (-1);
}
static int
parse_passwd_entry(struct passwd *pw, char *buf)
{
const char *errstr;
char *p, *q;
p = buf;
/* username */
q = p;
if ((p = strchr(q, ':')) == NULL)
return 0;
*p++ = 0;
pw->pw_name = q;
/* password */
q = p;
if ((p = strchr(q, ':')) == NULL)
return 0;
*p++ = 0;
pw->pw_passwd = q;
/* uid */
q = p;
if ((p = strchr(q, ':')) == NULL)
return 0;
*p++ = 0;
pw->pw_uid = strtonum(q, 1, UID_MAX, &errstr);
if (errstr)
return 0;
/* gid */
q = p;
if ((p = strchr(q, ':')) == NULL)
return 0;
*p++ = 0;
pw->pw_gid = strtonum(q, 1, GID_MAX, &errstr);
if (errstr)
return 0;
/* gecos */
q = p;
if ((p = strchr(q, ':')) == NULL)
return 0;
*p++ = 0;
pw->pw_gecos = q;
/* home */
q = p;
if ((p = strchr(q, ':')) == NULL)
return 0;
*p++ = 0;
pw->pw_dir = q;
/* shell */
q = p;
if (strchr(q, ':') != NULL)
return 0;
pw->pw_shell = q;
return 1;
}
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