1 /* 2 * Copyright (c) 2005, PADL Software Pty Ltd. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * 3. Neither the name of PADL Software nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "kcm_locl.h" 34 #include <pwd.h> 35 36 RCSID("$Id: client.c 20487 2007-04-21 06:25:06Z lha $"); 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 if (ret) { 80 kcm_release_ccache(context, &ccache); 81 return ret; 82 } 83 84 ret = kcm_ccache_destroy(context, ccache->name); 85 if (ret == 0) { 86 /* don't leave any events dangling */ 87 kcm_cleanup_events(context, ccache); 88 } 89 90 kcm_release_ccache(context, &ccache); 91 return ret; 92 } 93 94 krb5_error_code 95 kcm_ccache_new_client(krb5_context context, 96 kcm_client *client, 97 const char *name, 98 kcm_ccache *ccache_p) 99 { 100 krb5_error_code ret; 101 kcm_ccache ccache; 102 103 /* We insist the ccache name starts with UID or UID: */ 104 if (name_constraints != 0) { 105 char prefix[64]; 106 size_t prefix_len; 107 int bad = 1; 108 109 snprintf(prefix, sizeof(prefix), "%ld:", (long)client->uid); 110 prefix_len = strlen(prefix); 111 112 if (strncmp(name, prefix, prefix_len) == 0) 113 bad = 0; 114 else { 115 prefix[prefix_len - 1] = '\0'; 116 if (strcmp(name, prefix) == 0) 117 bad = 0; 118 } 119 120 /* Allow root to create badly-named ccaches */ 121 if (bad && !CLIENT_IS_ROOT(client)) 122 return KRB5_CC_BADNAME; 123 } 124 125 ret = kcm_ccache_resolve(context, name, &ccache); 126 if (ret == 0) { 127 if ((ccache->uid != client->uid || 128 ccache->gid != client->gid) && !CLIENT_IS_ROOT(client)) 129 return KRB5_FCC_PERM; 130 } else if (ret != KRB5_FCC_NOFILE && !(CLIENT_IS_ROOT(client) && ret == KRB5_FCC_PERM)) { 131 return ret; 132 } 133 134 if (ret == KRB5_FCC_NOFILE) { 135 ret = kcm_ccache_new(context, name, &ccache); 136 if (ret) { 137 kcm_log(1, "Failed to initialize cache %s: %s", 138 name, krb5_get_err_text(context, ret)); 139 return ret; 140 } 141 142 /* bind to current client */ 143 ccache->uid = client->uid; 144 ccache->gid = client->gid; 145 } else { 146 ret = kcm_zero_ccache_data(context, ccache); 147 if (ret) { 148 kcm_log(1, "Failed to empty cache %s: %s", 149 name, krb5_get_err_text(context, ret)); 150 kcm_release_ccache(context, &ccache); 151 return ret; 152 } 153 kcm_cleanup_events(context, ccache); 154 } 155 156 ret = kcm_access(context, client, KCM_OP_INITIALIZE, ccache); 157 if (ret) { 158 kcm_release_ccache(context, &ccache); 159 kcm_ccache_destroy(context, name); 160 return ret; 161 } 162 163 /* 164 * Finally, if the user is root and the cache was created under 165 * another user's name, chown the cache to that user and their 166 * default gid. 167 */ 168 if (CLIENT_IS_ROOT(client)) { 169 unsigned long uid; 170 int matches = sscanf(name,"%ld:",&uid); 171 if (matches == 0) 172 matches = sscanf(name,"%ld",&uid); 173 if (matches == 1) { 174 struct passwd *pwd = getpwuid(uid); 175 if (pwd != NULL) { 176 gid_t gid = pwd->pw_gid; 177 kcm_chown(context, client, ccache, uid, gid); 178 } 179 } 180 } 181 182 *ccache_p = ccache; 183 return 0; 184 } 185 186