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 * $FreeBSD: head/lib/libpam/modules/pam_ftpusers/pam_ftpusers.c 326219 2017-11-26 02:00:33Z pfg $
37 */
38
39 #include <ctype.h>
40 #include <grp.h>
41 #include <paths.h>
42 #include <pwd.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46
47 #define PAM_SM_ACCOUNT
48
49 #include <security/pam_appl.h>
50 #include <security/pam_modules.h>
51 #include <security/pam_mod_misc.h>
52 #include <security/openpam.h>
53
54 PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t * pamh,int flags __unused,int argc __unused,const char * argv[]__unused)55 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
56 int argc __unused, const char *argv[] __unused)
57 {
58 struct passwd *pwd;
59 struct group *grp;
60 const char *user;
61 int pam_err, found, allow;
62 char *line, *name, **mem;
63 size_t len, ulen;
64 FILE *f;
65
66 pam_err = pam_get_user(pamh, &user, NULL);
67 if (pam_err != PAM_SUCCESS)
68 return (pam_err);
69 if (user == NULL || (pwd = getpwnam(user)) == NULL)
70 return (PAM_SERVICE_ERR);
71
72 found = 0;
73 ulen = strlen(user);
74 if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) {
75 PAM_LOG("%s: %m", _PATH_FTPUSERS);
76 goto done;
77 }
78 while (!found && (line = fgetln(f, &len)) != NULL) {
79 if (*line == '#')
80 continue;
81 while (len > 0 && isspace(line[len - 1]))
82 --len;
83 if (len == 0)
84 continue;
85 /* simple case first */
86 if (*line != '@') {
87 if (len == ulen && strncmp(user, line, len) == 0)
88 found = 1;
89 continue;
90 }
91 /* member of specified group? */
92 asprintf(&name, "%.*s", (int)len - 1, line + 1);
93 if (name == NULL) {
94 fclose(f);
95 return (PAM_BUF_ERR);
96 }
97 grp = getgrnam(name);
98 free(name);
99 if (grp == NULL)
100 continue;
101 for (mem = grp->gr_mem; mem && *mem && !found; ++mem)
102 if (strcmp(user, *mem) == 0)
103 found = 1;
104 }
105 done:
106 allow = (openpam_get_option(pamh, "disallow") == NULL);
107 if (found)
108 pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR;
109 else
110 pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS;
111 if (f != NULL)
112 fclose(f);
113 return (pam_err);
114 }
115
116 PAM_MODULE_ENTRY("pam_ftpusers");
117