1/*- 2 * Copyright (c) 2003 Networks Associates Technology, Inc. 3 * All rights reserved. 4 * Copyright (c) 2008-2009 Apple Inc. All rights reserved. 5 * 6 * Portions of this software were developed for the FreeBSD Project by 7 * ThinkSec AS and NAI Labs, the Security Research Division of Network 8 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 9 * ("CBOSS"), as part of the DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <sys/cdefs.h> 37 38#include <sys/types.h> 39#include <sys/syslimits.h> 40 41#include <grp.h> 42#include <pwd.h> 43#include <stdarg.h> 44#include <stdio.h> 45#include <string.h> 46#include <unistd.h> 47#ifdef __APPLE__ 48#include <membership.h> 49#include <stdlib.h> 50#endif /* __APPLE__ */ 51 52#define PAM_SM_AUTH 53 54#include <security/pam_appl.h> 55#include <security/pam_modules.h> 56#include <security/openpam.h> 57 58PAM_EXTERN int 59pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused, 60 int argc __unused, const char *argv[] __unused) 61{ 62 const char *group, *user; 63 const void *ruser; 64#ifndef __APPLE__ 65 char *const *list; 66#endif /* !__APPLE__ */ 67 struct passwd *pwd; 68 struct passwd pwdbuf; 69 char pwbuffer[2 * PATH_MAX]; 70 struct group *grp; 71#ifdef __APPLE__ 72 char *str1, *str, *p; 73 int found_group = 0; 74 uuid_t u_uuid, g_uuid; 75 int ismember; 76#endif /* __APPLE__ */ 77 78 /* get target account */ 79 if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || 80 user == NULL || getpwnam_r(user, &pwdbuf, pwbuffer, sizeof(pwbuffer), &pwd) != 0 || pwd == NULL) { 81 openpam_log(PAM_LOG_ERROR, "Unable to obtain the username."); 82 return (PAM_AUTH_ERR); 83 } 84 if (pwd->pw_uid != 0 && openpam_get_option(pamh, "root_only")) { 85 openpam_log(PAM_LOG_DEBUG, "The root_only option means root only."); 86 return (PAM_IGNORE); 87 } 88 89 /* get applicant */ 90 if (openpam_get_option(pamh, "ruser") && 91 (pam_get_item(pamh, PAM_RUSER, &ruser) != PAM_SUCCESS || ruser == NULL || 92 getpwnam_r(ruser, &pwdbuf, pwbuffer, sizeof(pwbuffer), &pwd) != 0 || pwd == NULL)) { 93 openpam_log(PAM_LOG_ERROR, "Unable to obtain the remote username."); 94 return (PAM_AUTH_ERR); 95 } 96 97 /* get regulating group */ 98 if ((group = openpam_get_option(pamh, "group")) == NULL) { 99 group = "wheel"; 100 openpam_log(PAM_LOG_DEBUG, "With no group specfified, I am defaulting to wheel."); 101 } 102#ifdef __APPLE__ 103 str1 = str = strdup(group); 104 while ((p = strsep(&str, ",")) != NULL) { 105 if ((grp = getgrnam(p)) == NULL || grp->gr_mem == NULL) 106 continue; 107 108 /* check if the group is empty */ 109 if (*grp->gr_mem == NULL) 110 continue; 111 112 found_group = 1; 113 114 /* check membership */ 115 if (mbr_uid_to_uuid(pwd->pw_uid, u_uuid) != 0) 116 continue; 117 if (mbr_gid_to_uuid(grp->gr_gid, g_uuid) != 0) 118 continue; 119 if (mbr_check_membership(u_uuid, g_uuid, &ismember) != 0) 120 continue; 121 if (ismember) 122 goto found; 123 } 124 if (!found_group) { 125 openpam_log(PAM_LOG_DEBUG, "The specified group (%s) could not be found.", group); 126 goto failed; 127 } 128#else /* !__APPLE__ */ 129 if ((grp = getgrnam(group)) == NULL || grp->gr_mem == NULL) { 130 openpam_log(PAM_LOG_DEBUG, "The specified group (%s) is NULL.", group); 131 goto failed; 132 } 133 134 /* check if the group is empty */ 135 if (*grp->gr_mem == NULL) { 136 openpam_log(PAM_LOG_DEBUG, "The specified group (%s) is empty.", group); 137 goto failed; 138 } 139 140 /* check membership */ 141 if (pwd->pw_gid == grp->gr_gid) 142 goto found; 143 for (list = grp->gr_mem; *list != NULL; ++list) 144 if (strcmp(*list, pwd->pw_name) == 0) 145 goto found; 146#endif /* __APPLE__ */ 147 148 not_found: 149 openpam_log(PAM_LOG_DEBUG, "The group check failed."); 150#ifdef __APPLE__ 151 free(str1); 152#endif /* __APPLE__ */ 153 if (openpam_get_option(pamh, "deny")) 154 return (PAM_SUCCESS); 155 return (PAM_AUTH_ERR); 156 found: 157 openpam_log(PAM_LOG_DEBUG, "The group check succeeded."); 158#ifdef __APPLE__ 159 free(str1); 160#endif /* __APPLE__ */ 161 if (openpam_get_option(pamh, "deny")) 162 return (PAM_AUTH_ERR); 163 return (PAM_SUCCESS); 164 failed: 165 if (openpam_get_option(pamh, "fail_safe")) 166 goto found; 167 else 168 goto not_found; 169} 170 171 172PAM_MODULE_ENTRY("pam_group"); 173