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 <errno.h> 50#include <stdlib.h> 51#include <string.h> 52 53#define PAM_SM_ACCOUNT 54 55#include <security/pam_appl.h> 56#include <security/pam_modules.h> 57#include <security/pam_mod_misc.h> 58#include <security/openpam.h> 59 60PAM_EXTERN int 61pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused, 62 int argc __unused, const char *argv[] __unused) 63{ 64 struct passwd *pwd, pwres; 65 struct group *grp, grres; 66 const char *user; 67 int pam_err, found, allow; 68 char *line, *name, **mem; 69 size_t len, ulen; 70 FILE *f; 71 char pwbuf[1024], grbuf[1024]; 72 73 pam_err = pam_get_user(pamh, &user, NULL); 74 if (pam_err != PAM_SUCCESS) 75 return (pam_err); 76 if (user == NULL || 77 getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 78 pwd == NULL) 79 return (PAM_SERVICE_ERR); 80 81 found = 0; 82 ulen = strlen(user); 83 if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) { 84 PAM_LOG("%s: %s", _PATH_FTPUSERS, strerror(errno)); 85 goto done; 86 } 87 while (!found && (line = fgetln(f, &len)) != NULL) { 88 if (*line == '#') 89 continue; 90 while (len > 0 && isspace((unsigned char)line[len - 1])) 91 --len; 92 if (len == 0) 93 continue; 94 /* simple case first */ 95 if (*line != '@') { 96 if (len == ulen && strncmp(user, line, len) == 0) 97 found = 1; 98 continue; 99 } 100 /* member of specified group? */ 101 asprintf(&name, "%.*s", (int)len - 1, line + 1); 102 if (name == NULL) { 103 fclose(f); 104 return (PAM_BUF_ERR); 105 } 106 (void)getgrnam_r(name, &grres, grbuf, sizeof(grbuf), &grp); 107 free(name); 108 if (grp == NULL) 109 continue; 110 for (mem = grp->gr_mem; mem && *mem && !found; ++mem) 111 if (strcmp(user, *mem) == 0) 112 found = 1; 113 } 114 done: 115 allow = (openpam_get_option(pamh, "disallow") == NULL); 116 if (found) 117 pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR; 118 else 119 pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS; 120 if (f != NULL) 121 fclose(f); 122 return (pam_err); 123} 124 125PAM_MODULE_ENTRY("pam_ftpusers"); 126