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