1 /* $NetBSD: pam_ftpusers.c,v 1.2 2004/12/12 08:18:44 christos Exp $ */ 2 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 #ifdef __FreeBSD__ 39 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_ftpusers/pam_ftpusers.c,v 1.1 2002/05/08 00:30:10 des Exp $"); 40 #else 41 __RCSID("$NetBSD: pam_ftpusers.c,v 1.2 2004/12/12 08:18:44 christos Exp $"); 42 #endif 43 44 #include <ctype.h> 45 #include <grp.h> 46 #include <paths.h> 47 #include <pwd.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 52 #define PAM_SM_ACCOUNT 53 54 #include <security/pam_appl.h> 55 #include <security/pam_modules.h> 56 #include <security/pam_mod_misc.h> 57 #include <security/openpam.h> 58 59 PAM_EXTERN int 60 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused, 61 int argc __unused, const char *argv[] __unused) 62 { 63 struct passwd *pwd; 64 struct group *grp; 65 const char *user; 66 int pam_err, found, allow; 67 char *line, *name, **mem; 68 size_t len, ulen; 69 FILE *f; 70 71 pam_err = pam_get_user(pamh, &user, NULL); 72 if (pam_err != PAM_SUCCESS) 73 return (pam_err); 74 if (user == NULL || (pwd = getpwnam(user)) == NULL) 75 return (PAM_SERVICE_ERR); 76 77 found = 0; 78 ulen = strlen(user); 79 if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) { 80 PAM_LOG("%s: %m", _PATH_FTPUSERS); 81 goto done; 82 } 83 while (!found && (line = fgetln(f, &len)) != NULL) { 84 if (*line == '#') 85 continue; 86 while (len > 0 && isspace((unsigned char)line[len - 1])) 87 --len; 88 if (len == 0) 89 continue; 90 /* simple case first */ 91 if (*line != '@') { 92 if (len == ulen && strncmp(user, line, len) == 0) 93 found = 1; 94 continue; 95 } 96 /* member of specified group? */ 97 asprintf(&name, "%.*s", (int)len - 1, line + 1); 98 if (name == NULL) { 99 fclose(f); 100 return (PAM_BUF_ERR); 101 } 102 grp = getgrnam(name); 103 free(name); 104 if (grp == NULL) 105 continue; 106 for (mem = grp->gr_mem; mem && *mem && !found; ++mem) 107 if (strcmp(user, *mem) == 0) 108 found = 1; 109 } 110 done: 111 allow = (openpam_get_option(pamh, "disallow") == NULL); 112 if (found) 113 pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR; 114 else 115 pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS; 116 if (f != NULL) 117 fclose(f); 118 return (pam_err); 119 } 120 121 PAM_MODULE_ENTRY("pam_ftpusers"); 122