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#include <pwd.h> 37 38krb5_error_code 39kcm_ccache_resolve_client(krb5_context context, 40 kcm_client *client, 41 kcm_operation opcode, 42 const char *name, 43 kcm_ccache *ccache) 44{ 45 krb5_error_code ret; 46 47 ret = kcm_ccache_resolve_by_name(context, name, ccache); 48 if (ret) { 49 kcm_log(1, "Failed to resolve cache %s", name); 50 return ret; 51 } 52 53 ret = kcm_access(context, client, opcode, *ccache); 54 if (ret) { 55 ret = KRB5_FCC_NOFILE; /* don't disclose */ 56 kcm_release_ccache(context, *ccache); 57 } 58 59 return ret; 60} 61 62krb5_error_code 63kcm_ccache_destroy_client(krb5_context context, 64 kcm_client *client, 65 const char *name) 66{ 67 krb5_error_code ret; 68 kcm_ccache ccache; 69 70 ret = kcm_ccache_resolve_by_name(context, name, &ccache); 71 if (ret) { 72 kcm_log(1, "Failed to resolve cache %s", name); 73 return ret; 74 } 75 76 ret = kcm_access(context, client, KCM_OP_DESTROY, ccache); 77 kcm_release_ccache(context, ccache); 78 if (ret) 79 return ret; 80 81 return kcm_ccache_destroy(context, name); 82} 83 84krb5_error_code 85kcm_ccache_new_client(krb5_context context, 86 kcm_client *client, 87 const char *name, 88 kcm_ccache *ccache_p) 89{ 90 krb5_error_code ret; 91 kcm_ccache ccache; 92 93 ret = kcm_ccache_resolve_by_name(context, name, &ccache); 94 if (ret == 0) { 95 if ((ccache->uid != client->uid) && !CLIENT_IS_ROOT(client)) 96 return KRB5_FCC_PERM; 97 } else if (ret != KRB5_FCC_NOFILE && !(CLIENT_IS_ROOT(client) && ret == KRB5_FCC_PERM)) { 98 return ret; 99 } 100 101 if (ret == KRB5_FCC_NOFILE) { 102 ret = kcm_ccache_new(context, name, &ccache); 103 if (ret) { 104 kcm_log(1, "Failed to initialize cache %s", name); 105 return ret; 106 } 107 108 /* bind to current client */ 109 ccache->uid = client->uid; 110 ccache->session = client->session; 111 112 /* 113 * add notification when the session goes away, so we can 114 * remove the credential 115 */ 116 kcm_session_add(client->session); 117 118 } else { 119 ret = kcm_zero_ccache_data(context, ccache); 120 if (ret) { 121 kcm_log(1, "Failed to empty cache %s", name); 122 kcm_release_ccache(context, ccache); 123 return ret; 124 } 125 heim_ipc_event_cancel(ccache->renew_event); 126 heim_ipc_event_cancel(ccache->expire_event); 127 } 128 129 ret = kcm_access(context, client, KCM_OP_INITIALIZE, ccache); 130 if (ret) { 131 kcm_release_ccache(context, ccache); 132 kcm_ccache_destroy(context, name); 133 return ret; 134 } 135 136 /* 137 * Finally, if the user is root and the cache was created under 138 * another user's name, chown the cache to that user. 139 */ 140 if (CLIENT_IS_ROOT(client)) { 141 unsigned long uid; 142 int matches = sscanf(name,"%ld:",&uid); 143 if (matches == 0) 144 matches = sscanf(name,"%ld",&uid); 145 if (matches == 1) { 146 kcm_chown(context, client, ccache, (uid_t)uid); 147 } 148 } 149 150 *ccache_p = ccache; 151 return 0; 152} 153 154const char * 155kcm_client_get_execpath(kcm_client *client) 156{ 157 if (client->execpath[0] == '\0') { 158 int ret = proc_pidpath(client->pid, client->execpath, sizeof(client->execpath)); 159 if (ret != -1) 160 client->execpath[sizeof(client->execpath) - 1] = '\0'; 161 else { 162 /* failed, lets not try again */ 163 client->execpath[0] = 0x01; 164 client->execpath[1] = 0x0; 165 } 166 } 167 if (client->execpath[0] != '/') 168 return NULL; 169 170 return client->execpath; 171} 172 173 174