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 __FBSDID("$FreeBSD$"); 39 40 #include <ctype.h> 41 #include <grp.h> 42 #include <paths.h> 43 #include <pwd.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 48 #define PAM_SM_ACCOUNT 49 50 #include <security/pam_appl.h> 51 #include <security/pam_modules.h> 52 #include <security/pam_mod_misc.h> 53 #include <security/openpam.h> 54 55 PAM_EXTERN int 56 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused, 57 int argc __unused, const char *argv[] __unused) 58 { 59 struct passwd *pwd; 60 struct group *grp; 61 const char *user; 62 int pam_err, found, allow; 63 char *line, *name, **mem; 64 size_t len, ulen; 65 FILE *f; 66 67 pam_err = pam_get_user(pamh, &user, NULL); 68 if (pam_err != PAM_SUCCESS) 69 return (pam_err); 70 if (user == NULL || (pwd = getpwnam(user)) == NULL) 71 return (PAM_SERVICE_ERR); 72 73 found = 0; 74 ulen = strlen(user); 75 if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) { 76 PAM_LOG("%s: %m", _PATH_FTPUSERS); 77 goto done; 78 } 79 while (!found && (line = fgetln(f, &len)) != NULL) { 80 if (*line == '#') 81 continue; 82 while (len > 0 && isspace(line[len - 1])) 83 --len; 84 if (len == 0) 85 continue; 86 /* simple case first */ 87 if (*line != '@') { 88 if (len == ulen && strncmp(user, line, len) == 0) 89 found = 1; 90 continue; 91 } 92 /* member of specified group? */ 93 asprintf(&name, "%.*s", (int)len - 1, line + 1); 94 if (name == NULL) { 95 fclose(f); 96 return (PAM_BUF_ERR); 97 } 98 grp = getgrnam(name); 99 free(name); 100 if (grp == NULL) 101 continue; 102 for (mem = grp->gr_mem; mem && *mem && !found; ++mem) 103 if (strcmp(user, *mem) == 0) 104 found = 1; 105 } 106 done: 107 allow = (openpam_get_option(pamh, "disallow") == NULL); 108 if (found) 109 pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR; 110 else 111 pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS; 112 if (f != NULL) 113 fclose(f); 114 return (pam_err); 115 } 116 117 PAM_MODULE_ENTRY("pam_ftpusers"); 118