1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 #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
53 PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t * pamh,int flags __unused,int argc __unused,const char * argv[]__unused)54 pam_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
115 PAM_MODULE_ENTRY("pam_ftpusers");
116