1 /*- 2 * Copyright (c) 2003 Networks Associates Technology, Inc. 3 * All rights reserved. 4 * 5 * Portions of this software were developed for the FreeBSD Project by 6 * ThinkSec AS and NAI Labs, the Security Research Division of Network 7 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 8 * ("CBOSS"), as part of the 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 <sys/types.h> 39 40 #include <grp.h> 41 #include <pwd.h> 42 #include <stdarg.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <syslog.h> 46 #include <unistd.h> 47 48 #define PAM_SM_AUTH 49 50 #include <security/pam_appl.h> 51 #include <security/pam_modules.h> 52 #include <security/openpam.h> 53 54 55 PAM_EXTERN int 56 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, 57 int argc __unused, const char *argv[] __unused) 58 { 59 const char *group, *user, *ruser; 60 char *const *list; 61 struct passwd *pwd; 62 struct group *grp; 63 64 /* get target account */ 65 if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || 66 user == NULL || (pwd = getpwnam(user)) == NULL) 67 return (PAM_AUTH_ERR); 68 if (pwd->pw_uid != 0 && openpam_get_option(pamh, "root_only")) 69 return (PAM_IGNORE); 70 71 /* get applicant */ 72 if (pam_get_item(pamh, PAM_RUSER, (const void **)&ruser) != PAM_SUCCESS 73 || ruser == NULL || (pwd = getpwnam(ruser)) == NULL) 74 return (PAM_AUTH_ERR); 75 76 /* get regulating group */ 77 if ((group = openpam_get_option(pamh, "group")) == NULL) 78 group = "wheel"; 79 if ((grp = getgrnam(group)) == NULL || grp->gr_mem == NULL) 80 goto failed; 81 82 /* check if the group is empty */ 83 if (*grp->gr_mem == NULL) 84 goto failed; 85 86 /* check membership */ 87 if (pwd->pw_gid == grp->gr_gid) 88 goto found; 89 for (list = grp->gr_mem; *list != NULL; ++list) 90 if (strcmp(*list, pwd->pw_name) == 0) 91 goto found; 92 93 not_found: 94 if (openpam_get_option(pamh, "deny")) 95 return (PAM_SUCCESS); 96 return (PAM_AUTH_ERR); 97 found: 98 if (openpam_get_option(pamh, "deny")) 99 return (PAM_AUTH_ERR); 100 return (PAM_SUCCESS); 101 failed: 102 if (openpam_get_option(pamh, "fail_safe")) 103 goto found; 104 else 105 goto not_found; 106 } 107 108 PAM_EXTERN int 109 pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused, 110 int argc __unused, const char *argv[] __unused) 111 { 112 113 return (PAM_SUCCESS); 114 } 115 116 PAM_MODULE_ENTRY("pam_group"); 117