1 /* $NetBSD: pam_ftpusers.c,v 1.5 2005/04/19 13:04:38 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 1.5 2005/04/19 13:04:38 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, pwres; 64 struct group *grp, grres; 65 const char *user; 66 int pam_err, found, allow; 67 char *line, *name, **mem; 68 size_t len, ulen; 69 FILE *f; 70 char pwbuf[1024], grbuf[1024]; 71 72 pam_err = pam_get_user(pamh, &user, NULL); 73 if (pam_err != PAM_SUCCESS) 74 return (pam_err); 75 if (user == NULL || 76 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 77 pwd == NULL) 78 return (PAM_SERVICE_ERR); 79 80 found = 0; 81 ulen = strlen(user); 82 if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) { 83 PAM_LOG("%s: %m", _PATH_FTPUSERS); 84 goto done; 85 } 86 while (!found && (line = fgetln(f, &len)) != NULL) { 87 if (*line == '#') 88 continue; 89 while (len > 0 && isspace((unsigned char)line[len - 1])) 90 --len; 91 if (len == 0) 92 continue; 93 /* simple case first */ 94 if (*line != '@') { 95 if (len == ulen && strncmp(user, line, len) == 0) 96 found = 1; 97 continue; 98 } 99 /* member of specified group? */ 100 asprintf(&name, "%.*s", (int)len - 1, line + 1); 101 if (name == NULL) { 102 fclose(f); 103 return (PAM_BUF_ERR); 104 } 105 (void)getgrnam_r(name, &grres, grbuf, sizeof(grbuf), &grp); 106 free(name); 107 if (grp == NULL) 108 continue; 109 for (mem = grp->gr_mem; mem && *mem && !found; ++mem) 110 if (strcmp(user, *mem) == 0) 111 found = 1; 112 } 113 done: 114 allow = (openpam_get_option(pamh, "disallow") == NULL); 115 if (found) 116 pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR; 117 else 118 pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS; 119 if (f != NULL) 120 fclose(f); 121 return (pam_err); 122 } 123 124 PAM_MODULE_ENTRY("pam_ftpusers"); 125