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 38 krb5_error_code 39 kcm_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(context, name, ccache); 48 if (ret) { 49 kcm_log(1, "Failed to resolve cache %s: %s", 50 name, krb5_get_err_text(context, ret)); 51 return ret; 52 } 53 54 ret = kcm_access(context, client, opcode, *ccache); 55 if (ret) { 56 ret = KRB5_FCC_NOFILE; /* don't disclose */ 57 kcm_release_ccache(context, *ccache); 58 } 59 60 return ret; 61 } 62 63 krb5_error_code 64 kcm_ccache_destroy_client(krb5_context context, 65 kcm_client *client, 66 const char *name) 67 { 68 krb5_error_code ret; 69 kcm_ccache ccache; 70 71 ret = kcm_ccache_resolve(context, name, &ccache); 72 if (ret) { 73 kcm_log(1, "Failed to resolve cache %s: %s", 74 name, krb5_get_err_text(context, ret)); 75 return ret; 76 } 77 78 ret = kcm_access(context, client, KCM_OP_DESTROY, ccache); 79 kcm_cleanup_events(context, ccache); 80 kcm_release_ccache(context, ccache); 81 if (ret) 82 return ret; 83 84 return kcm_ccache_destroy(context, name); 85 } 86 87 krb5_error_code 88 kcm_ccache_new_client(krb5_context context, 89 kcm_client *client, 90 const char *name, 91 kcm_ccache *ccache_p) 92 { 93 krb5_error_code ret; 94 kcm_ccache ccache; 95 96 /* We insist the ccache name starts with UID or UID: */ 97 if (name_constraints != 0) { 98 char prefix[64]; 99 size_t prefix_len; 100 int bad = 1; 101 102 snprintf(prefix, sizeof(prefix), "%ld:", (long)client->uid); 103 prefix_len = strlen(prefix); 104 105 if (strncmp(name, prefix, prefix_len) == 0) 106 bad = 0; 107 else { 108 prefix[prefix_len - 1] = '\0'; 109 if (strcmp(name, prefix) == 0) 110 bad = 0; 111 } 112 113 /* Allow root to create badly-named ccaches */ 114 if (bad && !CLIENT_IS_ROOT(client)) 115 return KRB5_CC_BADNAME; 116 } 117 118 ret = kcm_ccache_resolve(context, name, &ccache); 119 if (ret == 0) { 120 if ((ccache->uid != client->uid || 121 ccache->gid != client->gid) && !CLIENT_IS_ROOT(client)) 122 return KRB5_FCC_PERM; 123 } else if (ret != KRB5_FCC_NOFILE && !(CLIENT_IS_ROOT(client) && ret == KRB5_FCC_PERM)) { 124 return ret; 125 } 126 127 if (ret == KRB5_FCC_NOFILE) { 128 ret = kcm_ccache_new(context, name, &ccache); 129 if (ret) { 130 kcm_log(1, "Failed to initialize cache %s: %s", 131 name, krb5_get_err_text(context, ret)); 132 return ret; 133 } 134 135 /* bind to current client */ 136 ccache->uid = client->uid; 137 ccache->gid = client->gid; 138 ccache->session = client->session; 139 } else { 140 ret = kcm_zero_ccache_data(context, ccache); 141 if (ret) { 142 kcm_log(1, "Failed to empty cache %s: %s", 143 name, krb5_get_err_text(context, ret)); 144 kcm_release_ccache(context, ccache); 145 return ret; 146 } 147 kcm_cleanup_events(context, ccache); 148 } 149 150 ret = kcm_access(context, client, KCM_OP_INITIALIZE, ccache); 151 if (ret) { 152 kcm_release_ccache(context, ccache); 153 kcm_ccache_destroy(context, name); 154 return ret; 155 } 156 157 /* 158 * Finally, if the user is root and the cache was created under 159 * another user's name, chown the cache to that user and their 160 * default gid. 161 */ 162 if (CLIENT_IS_ROOT(client)) { 163 unsigned long uid; 164 int matches = sscanf(name,"%ld:",&uid); 165 if (matches == 0) 166 matches = sscanf(name,"%ld",&uid); 167 if (matches == 1) { 168 struct passwd *pwd = getpwuid(uid); 169 if (pwd != NULL) { 170 gid_t gid = pwd->pw_gid; 171 kcm_chown(context, client, ccache, uid, gid); 172 } 173 } 174 } 175 176 *ccache_p = ccache; 177 return 0; 178 } 179 180