1 /*- 2 * Copyright (c) 2001 Networks Associates Technology, Inc. 3 * All rights reserved. 4 * 5 * This software was developed for the FreeBSD Project by ThinkSec AS and 6 * NAI Labs, the Security Research Division of Network Associates, Inc. 7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 8 * DARPA CHATS research program. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote 19 * products derived from this software without specific prior written 20 * permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <ctype.h> 39 #include <grp.h> 40 #include <paths.h> 41 #include <pwd.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #define PAM_SM_ACCOUNT 47 48 #include <security/pam_appl.h> 49 #include <security/pam_modules.h> 50 #include <security/pam_mod_misc.h> 51 #include <security/openpam.h> 52 53 PAM_EXTERN int 54 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused, 55 int argc __unused, const char *argv[] __unused) 56 { 57 struct passwd *pwd; 58 struct group *grp; 59 const char *user; 60 int pam_err, found, allow; 61 char *line, *name, **mem; 62 size_t len, ulen; 63 FILE *f; 64 65 pam_err = pam_get_user(pamh, &user, NULL); 66 if (pam_err != PAM_SUCCESS) 67 return (pam_err); 68 if (user == NULL || (pwd = getpwnam(user)) == NULL) 69 return (PAM_SERVICE_ERR); 70 71 found = 0; 72 ulen = strlen(user); 73 if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) { 74 PAM_LOG("%s: %m", _PATH_FTPUSERS); 75 goto done; 76 } 77 while (!found && (line = fgetln(f, &len)) != NULL) { 78 if (*line == '#') 79 continue; 80 while (len > 0 && isspace(line[len - 1])) 81 --len; 82 if (len == 0) 83 continue; 84 /* simple case first */ 85 if (*line != '@') { 86 if (len == ulen && strncmp(user, line, len) == 0) 87 found = 1; 88 continue; 89 } 90 /* member of specified group? */ 91 asprintf(&name, "%.*s", (int)len - 1, line + 1); 92 if (name == NULL) { 93 fclose(f); 94 return (PAM_BUF_ERR); 95 } 96 grp = getgrnam(name); 97 free(name); 98 if (grp == NULL) 99 continue; 100 for (mem = grp->gr_mem; mem && *mem && !found; ++mem) 101 if (strcmp(user, *mem) == 0) 102 found = 1; 103 } 104 done: 105 allow = (openpam_get_option(pamh, "disallow") == NULL); 106 if (found) 107 pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR; 108 else 109 pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS; 110 if (f != NULL) 111 fclose(f); 112 return (pam_err); 113 } 114 115 PAM_MODULE_ENTRY("pam_ftpusers"); 116