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 <getarg.h> 35 #include <parse_bytes.h> 36 37 RCSID("$Id: config.c 15296 2005-05-30 10:17:43Z lha $"); 38 39 static const char *config_file; /* location of kcm config file */ 40 41 size_t max_request = 0; /* maximal size of a request */ 42 char *socket_path = NULL; 43 char *door_path = NULL; 44 45 static char *max_request_str; /* `max_request' as a string */ 46 47 int detach_from_console = -1; 48 #define DETACH_IS_DEFAULT FALSE 49 50 static const char *system_cache_name = NULL; 51 static const char *system_keytab = NULL; 52 static const char *system_principal = NULL; 53 static const char *system_server = NULL; 54 static const char *system_perms = NULL; 55 static const char *system_user = NULL; 56 static const char *system_group = NULL; 57 58 static const char *renew_life = NULL; 59 static const char *ticket_life = NULL; 60 61 int disallow_getting_krbtgt = -1; 62 int name_constraints = -1; 63 64 static int help_flag; 65 static int version_flag; 66 67 static struct getargs args[] = { 68 { 69 "cache-name", 0, arg_string, &system_cache_name, 70 "system cache name", "cachename" 71 }, 72 { 73 "config-file", 'c', arg_string, &config_file, 74 "location of config file", "file" 75 }, 76 { 77 "group", 'g', arg_string, &system_group, 78 "system cache group", "group" 79 }, 80 { 81 "max-request", 0, arg_string, &max_request, 82 "max size for a kcm-request", "size" 83 }, 84 #if DETACH_IS_DEFAULT 85 { 86 "detach", 'D', arg_negative_flag, &detach_from_console, 87 "don't detach from console" 88 }, 89 #else 90 { 91 "detach", 0 , arg_flag, &detach_from_console, 92 "detach from console" 93 }, 94 #endif 95 { "help", 'h', arg_flag, &help_flag }, 96 { 97 "system-principal", 'k', arg_string, &system_principal, 98 "system principal name", "principal" 99 }, 100 { 101 "lifetime", 'l', arg_string, &ticket_life, 102 "lifetime of system tickets", "time" 103 }, 104 { 105 "mode", 'm', arg_string, &system_perms, 106 "octal mode of system cache", "mode" 107 }, 108 { 109 "name-constraints", 'n', arg_negative_flag, &name_constraints, 110 "disable credentials cache name constraints" 111 }, 112 { 113 "disallow-getting-krbtgt", 0, arg_flag, &disallow_getting_krbtgt, 114 "disable fetching krbtgt from the cache" 115 }, 116 { 117 "renewable-life", 'r', arg_string, &renew_life, 118 "renewable lifetime of system tickets", "time" 119 }, 120 { 121 "socket-path", 's', arg_string, &socket_path, 122 "path to kcm domain socket", "path" 123 }, 124 #ifdef HAVE_DOOR_CREATE 125 { 126 "door-path", 's', arg_string, &door_path, 127 "path to kcm door", "path" 128 }, 129 #endif 130 { 131 "server", 'S', arg_string, &system_server, 132 "server to get system ticket for", "principal" 133 }, 134 { 135 "keytab", 't', arg_string, &system_keytab, 136 "system keytab name", "keytab" 137 }, 138 { 139 "user", 'u', arg_string, &system_user, 140 "system cache owner", "user" 141 }, 142 { "version", 'v', arg_flag, &version_flag } 143 }; 144 145 static int num_args = sizeof(args) / sizeof(args[0]); 146 147 static void 148 usage(int ret) 149 { 150 arg_printusage (args, num_args, NULL, ""); 151 exit (ret); 152 } 153 154 static int parse_owners(kcm_ccache ccache) 155 { 156 uid_t uid = 0; 157 gid_t gid = 0; 158 struct passwd *pw; 159 struct group *gr; 160 int uid_p = 0; 161 int gid_p = 0; 162 163 if (system_user != NULL) { 164 if (isdigit((unsigned char)system_user[0])) { 165 pw = getpwuid(atoi(system_user)); 166 } else { 167 pw = getpwnam(system_user); 168 } 169 if (pw == NULL) { 170 return errno; 171 } 172 173 system_user = strdup(pw->pw_name); 174 if (system_user == NULL) { 175 return ENOMEM; 176 } 177 178 uid = pw->pw_uid; uid_p = 1; 179 gid = pw->pw_gid; gid_p = 1; 180 } 181 182 if (system_group != NULL) { 183 if (isdigit((unsigned char)system_group[0])) { 184 gr = getgrgid(atoi(system_group)); 185 } else { 186 gr = getgrnam(system_group); 187 } 188 if (gr == NULL) { 189 return errno; 190 } 191 192 gid = gr->gr_gid; gid_p = 1; 193 } 194 195 if (uid_p) 196 ccache->uid = uid; 197 else 198 ccache->uid = 0; /* geteuid() XXX */ 199 200 if (gid_p) 201 ccache->gid = gid; 202 else 203 ccache->gid = 0; /* getegid() XXX */ 204 205 return 0; 206 } 207 208 static const char * 209 kcm_system_config_get_string(const char *string) 210 { 211 return krb5_config_get_string(kcm_context, NULL, "kcm", 212 "system_ccache", string, NULL); 213 } 214 215 static krb5_error_code 216 ccache_init_system(void) 217 { 218 kcm_ccache ccache; 219 krb5_error_code ret; 220 221 if (system_cache_name == NULL) 222 system_cache_name = kcm_system_config_get_string("cc_name"); 223 224 ret = kcm_ccache_new(kcm_context, 225 system_cache_name ? system_cache_name : "SYSTEM", 226 &ccache); 227 if (ret) 228 return ret; 229 230 ccache->flags |= KCM_FLAGS_OWNER_IS_SYSTEM; 231 ccache->flags |= KCM_FLAGS_USE_KEYTAB; 232 233 ret = parse_owners(ccache); 234 if (ret) 235 return ret; 236 237 ret = krb5_parse_name(kcm_context, system_principal, &ccache->client); 238 if (ret) { 239 kcm_release_ccache(kcm_context, &ccache); 240 return ret; 241 } 242 243 if (system_server == NULL) 244 system_server = kcm_system_config_get_string("server"); 245 246 if (system_server != NULL) { 247 ret = krb5_parse_name(kcm_context, system_server, &ccache->server); 248 if (ret) { 249 kcm_release_ccache(kcm_context, &ccache); 250 return ret; 251 } 252 } 253 254 if (system_keytab == NULL) 255 system_keytab = kcm_system_config_get_string("keytab_name"); 256 257 if (system_keytab != NULL) { 258 ret = krb5_kt_resolve(kcm_context, system_keytab, &ccache->key.keytab); 259 } else { 260 ret = krb5_kt_default(kcm_context, &ccache->key.keytab); 261 } 262 if (ret) { 263 kcm_release_ccache(kcm_context, &ccache); 264 return ret; 265 } 266 267 if (renew_life == NULL) 268 renew_life = kcm_system_config_get_string("renew_life"); 269 270 if (renew_life == NULL) 271 renew_life = "1 month"; 272 273 if (renew_life != NULL) { 274 ccache->renew_life = parse_time(renew_life, "s"); 275 if (ccache->renew_life < 0) { 276 kcm_release_ccache(kcm_context, &ccache); 277 return EINVAL; 278 } 279 } 280 281 if (ticket_life == NULL) 282 ticket_life = kcm_system_config_get_string("ticket_life"); 283 284 if (ticket_life != NULL) { 285 ccache->tkt_life = parse_time(ticket_life, "s"); 286 if (ccache->tkt_life < 0) { 287 kcm_release_ccache(kcm_context, &ccache); 288 return EINVAL; 289 } 290 } 291 292 if (system_perms == NULL) 293 system_perms = kcm_system_config_get_string("mode"); 294 295 if (system_perms != NULL) { 296 int mode; 297 298 if (sscanf(system_perms, "%o", &mode) != 1) 299 return EINVAL; 300 301 ccache->mode = mode; 302 } 303 304 if (disallow_getting_krbtgt == -1) { 305 disallow_getting_krbtgt = 306 krb5_config_get_bool_default(kcm_context, NULL, FALSE, "kcm", 307 "disallow-getting-krbtgt", NULL); 308 } 309 310 /* enqueue default actions for credentials cache */ 311 ret = kcm_ccache_enqueue_default(kcm_context, ccache, NULL); 312 313 kcm_release_ccache(kcm_context, &ccache); /* retained by event queue */ 314 315 return ret; 316 } 317 318 void 319 kcm_configure(int argc, char **argv) 320 { 321 krb5_error_code ret; 322 int optind = 0; 323 const char *p; 324 325 while(getarg(args, num_args, argc, argv, &optind)) 326 warnx("error at argument `%s'", argv[optind]); 327 328 if(help_flag) 329 usage (0); 330 331 if (version_flag) { 332 print_version(NULL); 333 exit(0); 334 } 335 336 argc -= optind; 337 argv += optind; 338 339 if (argc != 0) 340 usage(1); 341 342 { 343 char **files; 344 345 if(config_file == NULL) 346 config_file = _PATH_KCM_CONF; 347 348 ret = krb5_prepend_config_files_default(config_file, &files); 349 if (ret) 350 krb5_err(kcm_context, 1, ret, "getting configuration files"); 351 352 ret = krb5_set_config_files(kcm_context, files); 353 krb5_free_config_files(files); 354 if(ret) 355 krb5_err(kcm_context, 1, ret, "reading configuration files"); 356 } 357 358 if(max_request_str) 359 max_request = parse_bytes(max_request_str, NULL); 360 361 if(max_request == 0){ 362 p = krb5_config_get_string (kcm_context, 363 NULL, 364 "kcm", 365 "max-request", 366 NULL); 367 if(p) 368 max_request = parse_bytes(p, NULL); 369 } 370 371 if (system_principal == NULL) { 372 system_principal = kcm_system_config_get_string("principal"); 373 } 374 375 if (system_principal != NULL) { 376 ret = ccache_init_system(); 377 if (ret) 378 krb5_err(kcm_context, 1, ret, "initializing system ccache"); 379 } 380 381 if(detach_from_console == -1) 382 detach_from_console = krb5_config_get_bool_default(kcm_context, NULL, 383 DETACH_IS_DEFAULT, 384 "kcm", 385 "detach", NULL); 386 kcm_openlog(); 387 if(max_request == 0) 388 max_request = 64 * 1024; 389 } 390 391