1/* 2 * Copyright (c) 2005, PADL Software Pty Ltd. 3 * All rights reserved. 4 * 5 * Portions Copyright (c) 2009 Apple Inc. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * 3. Neither the name of PADL Software nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE 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 PADL SOFTWARE 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 "kcm_locl.h" 36 37krb5_error_code 38kcm_access(krb5_context context, 39 kcm_client *client, 40 kcm_operation opcode, 41 kcm_ccache ccache) 42{ 43 krb5_error_code ret; 44 45 KCM_ASSERT_VALID(ccache); 46 47 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) { 48 /* Let root always read system caches */ 49 if (CLIENT_IS_ROOT(client)) { 50 ret = 0; 51 } else { 52 ret = KRB5_FCC_PERM; 53 } 54 } else if (kcm_is_same_session(client, ccache->uid, ccache->session)) { 55 /* same session same as owner */ 56 ret = 0; 57 } else { 58 ret = KRB5_FCC_PERM; 59 } 60 61 if (ret) { 62 kcm_log(2, "Process %d is not permitted to call %s on cache %s", 63 client->pid, kcm_op2string(opcode), ccache->name); 64 } 65 66 return ret; 67} 68 69krb5_error_code 70kcm_chmod(krb5_context context, 71 kcm_client *client, 72 kcm_ccache ccache, 73 uint16_t mode) 74{ 75 KCM_ASSERT_VALID(ccache); 76 77 /* System cache mode can only be set at startup */ 78 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) 79 return KRB5_FCC_PERM; 80 81 if (ccache->uid != client->uid) 82 return KRB5_FCC_PERM; 83 84 return 0; 85} 86 87krb5_error_code 88kcm_chown(krb5_context context, 89 kcm_client *client, 90 kcm_ccache ccache, 91 uid_t uid) 92{ 93 KCM_ASSERT_VALID(ccache); 94 95 /* System cache owner can only be set at startup */ 96 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) 97 return KRB5_FCC_PERM; 98 99 if (ccache->uid != client->uid && client->uid != 0) 100 return KRB5_FCC_PERM; 101 102 HEIMDAL_MUTEX_lock(&ccache->mutex); 103 104 ccache->uid = uid; 105 106 HEIMDAL_MUTEX_unlock(&ccache->mutex); 107 108 return 0; 109} 110 111