1/*	$NetBSD: pam_ftpusers.c,v 1.5 2005/04/19 13:04:38 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2001 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * This software was developed for the FreeBSD Project by ThinkSec AS and
8 * NAI Labs, the Security Research Division of Network Associates, Inc.
9 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
10 * DARPA CHATS research program.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote
21 *    products derived from this software without specific prior written
22 *    permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38#ifdef __FreeBSD__
39__FBSDID("$FreeBSD: src/lib/libpam/modules/pam_ftpusers/pam_ftpusers.c,v 1.1 2002/05/08 00:30:10 des Exp $");
40#else
41__RCSID("$NetBSD: pam_ftpusers.c,v 1.5 2005/04/19 13:04:38 christos Exp $");
42#endif
43
44#include <ctype.h>
45#include <grp.h>
46#include <paths.h>
47#include <pwd.h>
48#include <stdio.h>
49#include <errno.h>
50#include <stdlib.h>
51#include <string.h>
52
53#define PAM_SM_ACCOUNT
54
55#include <security/pam_appl.h>
56#include <security/pam_modules.h>
57#include <security/pam_mod_misc.h>
58#include <security/openpam.h>
59
60PAM_EXTERN int
61pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
62    int argc __unused, const char *argv[] __unused)
63{
64	struct passwd *pwd, pwres;
65	struct group *grp, grres;
66	const char *user;
67	int pam_err, found, allow;
68	char *line, *name, **mem;
69	size_t len, ulen;
70	FILE *f;
71	char pwbuf[1024], grbuf[1024];
72
73	pam_err = pam_get_user(pamh, &user, NULL);
74	if (pam_err != PAM_SUCCESS)
75		return (pam_err);
76	if (user == NULL ||
77	    getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
78	    pwd == NULL)
79		return (PAM_SERVICE_ERR);
80
81	found = 0;
82	ulen = strlen(user);
83	if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) {
84		PAM_LOG("%s: %s", _PATH_FTPUSERS, strerror(errno));
85		goto done;
86	}
87	while (!found && (line = fgetln(f, &len)) != NULL) {
88		if (*line == '#')
89			continue;
90		while (len > 0 && isspace((unsigned char)line[len - 1]))
91			--len;
92		if (len == 0)
93			continue;
94		/* simple case first */
95		if (*line != '@') {
96			if (len == ulen && strncmp(user, line, len) == 0)
97				found = 1;
98			continue;
99		}
100		/* member of specified group? */
101		asprintf(&name, "%.*s", (int)len - 1, line + 1);
102		if (name == NULL) {
103			fclose(f);
104			return (PAM_BUF_ERR);
105		}
106		(void)getgrnam_r(name, &grres, grbuf, sizeof(grbuf), &grp);
107		free(name);
108		if (grp == NULL)
109			continue;
110		for (mem = grp->gr_mem; mem && *mem && !found; ++mem)
111			if (strcmp(user, *mem) == 0)
112				found = 1;
113	}
114 done:
115	allow = (openpam_get_option(pamh, "disallow") == NULL);
116	if (found)
117		pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR;
118	else
119		pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS;
120	if (f != NULL)
121		fclose(f);
122	return (pam_err);
123}
124
125PAM_MODULE_ENTRY("pam_ftpusers");
126