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 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