1 /* $NetBSD: acl.c,v 1.2 2017/01/28 21:31:44 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2005, PADL Software Pty Ltd. 5 * All rights reserved. 6 * 7 * Portions Copyright (c) 2009 Apple Inc. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 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 * 20 * 3. Neither the name of PADL Software nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE 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 PADL SOFTWARE 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 "kcm_locl.h" 38 39 krb5_error_code 40 kcm_access(krb5_context context, 41 kcm_client *client, 42 kcm_operation opcode, 43 kcm_ccache ccache) 44 { 45 int read_p = 0; 46 int write_p = 0; 47 uint16_t mask; 48 krb5_error_code ret; 49 50 KCM_ASSERT_VALID(ccache); 51 52 switch (opcode) { 53 case KCM_OP_INITIALIZE: 54 case KCM_OP_DESTROY: 55 case KCM_OP_STORE: 56 case KCM_OP_REMOVE_CRED: 57 case KCM_OP_SET_FLAGS: 58 case KCM_OP_CHOWN: 59 case KCM_OP_CHMOD: 60 case KCM_OP_GET_INITIAL_TICKET: 61 case KCM_OP_GET_TICKET: 62 case KCM_OP_MOVE_CACHE: 63 case KCM_OP_SET_DEFAULT_CACHE: 64 case KCM_OP_SET_KDC_OFFSET: 65 write_p = 1; 66 read_p = 0; 67 break; 68 case KCM_OP_NOOP: 69 case KCM_OP_GET_NAME: 70 case KCM_OP_RESOLVE: 71 case KCM_OP_GEN_NEW: 72 case KCM_OP_RETRIEVE: 73 case KCM_OP_GET_PRINCIPAL: 74 case KCM_OP_GET_CRED_UUID_LIST: 75 case KCM_OP_GET_CRED_BY_UUID: 76 case KCM_OP_GET_CACHE_UUID_LIST: 77 case KCM_OP_GET_CACHE_BY_UUID: 78 case KCM_OP_GET_DEFAULT_CACHE: 79 case KCM_OP_GET_KDC_OFFSET: 80 write_p = 0; 81 read_p = 1; 82 break; 83 default: 84 ret = KRB5_FCC_PERM; 85 goto out; 86 } 87 88 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) { 89 /* System caches cannot be reinitialized or destroyed by users */ 90 if (opcode == KCM_OP_INITIALIZE || 91 opcode == KCM_OP_DESTROY || 92 opcode == KCM_OP_REMOVE_CRED || 93 opcode == KCM_OP_MOVE_CACHE) { 94 ret = KRB5_FCC_PERM; 95 goto out; 96 } 97 98 /* Let root always read system caches */ 99 if (CLIENT_IS_ROOT(client)) { 100 ret = 0; 101 goto out; 102 } 103 } 104 105 /* start out with "other" mask */ 106 mask = S_IROTH|S_IWOTH; 107 108 /* root can do anything */ 109 if (CLIENT_IS_ROOT(client)) { 110 if (read_p) 111 mask |= S_IRUSR|S_IRGRP|S_IROTH; 112 if (write_p) 113 mask |= S_IWUSR|S_IWGRP|S_IWOTH; 114 } 115 /* same session same as owner */ 116 if (kcm_is_same_session(client, ccache->uid, ccache->session)) { 117 if (read_p) 118 mask |= S_IROTH; 119 if (write_p) 120 mask |= S_IWOTH; 121 } 122 /* owner */ 123 if (client->uid == ccache->uid) { 124 if (read_p) 125 mask |= S_IRUSR; 126 if (write_p) 127 mask |= S_IWUSR; 128 } 129 /* group */ 130 if (client->gid == ccache->gid) { 131 if (read_p) 132 mask |= S_IRGRP; 133 if (write_p) 134 mask |= S_IWGRP; 135 } 136 137 ret = (ccache->mode & mask) ? 0 : KRB5_FCC_PERM; 138 139 out: 140 if (ret) { 141 kcm_log(2, "Process %d is not permitted to call %s on cache %s", 142 client->pid, kcm_op2string(opcode), ccache->name); 143 } 144 145 return ret; 146 } 147 148 krb5_error_code 149 kcm_chmod(krb5_context context, 150 kcm_client *client, 151 kcm_ccache ccache, 152 uint16_t mode) 153 { 154 KCM_ASSERT_VALID(ccache); 155 156 /* System cache mode can only be set at startup */ 157 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) 158 return KRB5_FCC_PERM; 159 160 if (ccache->uid != client->uid) 161 return KRB5_FCC_PERM; 162 163 if (ccache->gid != client->gid) 164 return KRB5_FCC_PERM; 165 166 HEIMDAL_MUTEX_lock(&ccache->mutex); 167 168 ccache->mode = mode; 169 170 HEIMDAL_MUTEX_unlock(&ccache->mutex); 171 172 return 0; 173 } 174 175 krb5_error_code 176 kcm_chown(krb5_context context, 177 kcm_client *client, 178 kcm_ccache ccache, 179 uid_t uid, 180 gid_t gid) 181 { 182 KCM_ASSERT_VALID(ccache); 183 184 /* System cache owner can only be set at startup */ 185 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) 186 return KRB5_FCC_PERM; 187 188 if (ccache->uid != client->uid) 189 return KRB5_FCC_PERM; 190 191 if (ccache->gid != client->gid) 192 return KRB5_FCC_PERM; 193 194 HEIMDAL_MUTEX_lock(&ccache->mutex); 195 196 ccache->uid = uid; 197 ccache->gid = gid; 198 199 HEIMDAL_MUTEX_unlock(&ccache->mutex); 200 201 return 0; 202 } 203 204
Indexes created Mon Oct 19 00:25:19 UTC 2026