1 /* $NetBSD: config.c,v 1.4 2023/06/19 21:41:41 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 #include <krb5/getarg.h>
39 #include <krb5/parse_bytes.h>
40
41 static const char *config_file; /* location of kcm config file */
42
43 size_t max_request = 0; /* maximal size of a request */
44 char *socket_path = NULL;
45 char *door_path = NULL;
46
47 static char *max_request_str; /* `max_request' as a string */
48
49 int detach_from_console = -1;
50 int daemon_child = -1;
51
52 static const char *system_cache_name = NULL;
53 static const char *system_keytab = NULL;
54 static const char *system_principal = NULL;
55 static const char *system_server = NULL;
56 static const char *system_perms = NULL;
57 static const char *system_user = NULL;
58 static const char *system_group = NULL;
59
60 static const char *renew_life = NULL;
61 static const char *ticket_life = NULL;
62
63 int launchd_flag = 0;
64 int disallow_getting_krbtgt = 0;
65 int name_constraints = -1;
66
67 static int help_flag;
68 static int version_flag;
69
70 static struct getargs args[] = {
71 {
72 "cache-name", 0, arg_string, &system_cache_name,
73 "system cache name", "cachename"
74 },
75 {
76 "config-file", 'c', arg_string, &config_file,
77 "location of config file", "file"
78 },
79 {
80 "group", 'g', arg_string, &system_group,
81 "system cache group", "group"
82 },
83 {
84 "max-request", 0, arg_string, &max_request,
85 "max size for a kcm-request", "size"
86 },
87 {
88 "launchd", 0, arg_flag, &launchd_flag,
89 "when in use by launchd", NULL
90 },
91 {
92 "detach", 0 , arg_flag, &detach_from_console,
93 "detach from console", NULL
94 },
95 {
96 "daemon-child", 0 , arg_integer, &daemon_child,
97 "private argument, do not use", NULL
98 },
99 { "help", 'h', arg_flag, &help_flag, NULL, NULL },
100 {
101 "system-principal", 'k', arg_string, &system_principal,
102 "system principal name", "principal"
103 },
104 {
105 "lifetime", 'l', arg_string, &ticket_life,
106 "lifetime of system tickets", "time"
107 },
108 {
109 "mode", 'm', arg_string, &system_perms,
110 "octal mode of system cache", "mode"
111 },
112 {
113 "name-constraints", 'n', arg_negative_flag, &name_constraints,
114 "disable credentials cache name constraints", NULL
115 },
116 {
117 "disallow-getting-krbtgt", 0, arg_flag, &disallow_getting_krbtgt,
118 "disable fetching krbtgt from the cache", NULL
119 },
120 {
121 "renewable-life", 'r', arg_string, &renew_life,
122 "renewable lifetime of system tickets", "time"
123 },
124 {
125 "socket-path", 's', arg_string, &socket_path,
126 "path to kcm domain socket", "path"
127 },
128 #ifdef HAVE_DOOR_CREATE
129 {
130 "door-path", 's', arg_string, &door_path,
131 "path to kcm door", "path"
132 },
133 #endif
134 {
135 "server", 'S', arg_string, &system_server,
136 "server to get system ticket for", "principal"
137 },
138 {
139 "keytab", 't', arg_string, &system_keytab,
140 "system keytab name", "keytab"
141 },
142 {
143 "user", 'u', arg_string, &system_user,
144 "system cache owner", "user"
145 },
146 { "version", 'v', arg_flag, &version_flag, NULL, NULL }
147 };
148
149 static int num_args = sizeof(args) / sizeof(args[0]);
150
151 static void
usage(int ret)152 usage(int ret)
153 {
154 arg_printusage (args, num_args, NULL, "");
155 exit (ret);
156 }
157
parse_owners(kcm_ccache ccache)158 static int parse_owners(kcm_ccache ccache)
159 {
160 uid_t uid = 0;
161 gid_t gid = 0;
162 struct group *gr;
163 int uid_p = 0;
164 int gid_p = 0;
165 struct passwd pw, *pwd = NULL;
166 char pwbuf[2048];
167
168 if (system_user != NULL) {
169 if (isdigit((unsigned char)system_user[0])) {
170 if (rk_getpwuid_r(atoi(system_user), &pw, pwbuf, sizeof(pwbuf),
171 &pwd) != 0)
172 pwd = NULL;
173 } else {
174 if (rk_getpwnam_r(system_user, &pw, pwbuf, sizeof(pwbuf),
175 &pwd) != 0)
176 pwd = NULL;
177 }
178 if (pwd == NULL) {
179 return errno;
180 }
181
182 system_user = strdup(pwd->pw_name);
183 if (system_user == NULL) {
184 return ENOMEM;
185 }
186
187 uid = pwd->pw_uid; uid_p = 1;
188 gid = pwd->pw_gid; gid_p = 1;
189 }
190
191 if (system_group != NULL) {
192 if (isdigit((unsigned char)system_group[0])) {
193 gr = getgrgid(atoi(system_group));
194 } else {
195 gr = getgrnam(system_group);
196 }
197 if (gr == NULL) {
198 return errno;
199 }
200
201 gid = gr->gr_gid; gid_p = 1;
202 }
203
204 if (uid_p)
205 ccache->uid = uid;
206 else
207 ccache->uid = 0; /* geteuid() XXX */
208
209 if (gid_p)
210 ccache->gid = gid;
211 else
212 ccache->gid = 0; /* getegid() XXX */
213
214 return 0;
215 }
216
217 static const char *
kcm_system_config_get_string(const char * string)218 kcm_system_config_get_string(const char *string)
219 {
220 return krb5_config_get_string(kcm_context, NULL, "kcm",
221 "system_ccache", string, NULL);
222 }
223
224 static krb5_error_code
ccache_init_system(void)225 ccache_init_system(void)
226 {
227 kcm_ccache ccache;
228 krb5_error_code ret;
229
230 if (system_cache_name == NULL)
231 system_cache_name = kcm_system_config_get_string("cc_name");
232
233 ret = kcm_ccache_new(kcm_context,
234 system_cache_name ? system_cache_name : "SYSTEM",
235 &ccache);
236 if (ret)
237 return ret;
238
239 ccache->flags |= KCM_FLAGS_OWNER_IS_SYSTEM;
240 ccache->flags |= KCM_FLAGS_USE_KEYTAB;
241
242 ret = parse_owners(ccache);
243 if (ret)
244 return ret;
245
246 ret = krb5_parse_name(kcm_context, system_principal, &ccache->client);
247 if (ret) {
248 kcm_release_ccache(kcm_context, ccache);
249 return ret;
250 }
251
252 if (system_server == NULL)
253 system_server = kcm_system_config_get_string("server");
254
255 if (system_server != NULL) {
256 ret = krb5_parse_name(kcm_context, system_server, &ccache->server);
257 if (ret) {
258 kcm_release_ccache(kcm_context, ccache);
259 return ret;
260 }
261 }
262
263 if (system_keytab == NULL)
264 system_keytab = kcm_system_config_get_string("keytab_name");
265
266 if (system_keytab != NULL) {
267 ret = krb5_kt_resolve(kcm_context, system_keytab, &ccache->key.keytab);
268 } else {
269 ret = krb5_kt_default(kcm_context, &ccache->key.keytab);
270 }
271 if (ret) {
272 kcm_release_ccache(kcm_context, ccache);
273 return ret;
274 }
275
276 if (renew_life == NULL)
277 renew_life = kcm_system_config_get_string("renew_life");
278
279 if (renew_life == NULL)
280 renew_life = "6 months";
281
282 if (renew_life != NULL) {
283 ccache->renew_life = parse_time(renew_life, "s");
284 if (ccache->renew_life < 0) {
285 kcm_release_ccache(kcm_context, ccache);
286 return EINVAL;
287 }
288 }
289
290 if (ticket_life == NULL)
291 ticket_life = kcm_system_config_get_string("ticket_life");
292
293 if (ticket_life != NULL) {
294 ccache->tkt_life = parse_time(ticket_life, "s");
295 if (ccache->tkt_life < 0) {
296 kcm_release_ccache(kcm_context, ccache);
297 return EINVAL;
298 }
299 }
300
301 if (system_perms == NULL)
302 system_perms = kcm_system_config_get_string("mode");
303
304 if (system_perms != NULL) {
305 int mode;
306
307 if (sscanf(system_perms, "%o", &mode) != 1)
308 return EINVAL;
309
310 ccache->mode = mode;
311 }
312
313 if (disallow_getting_krbtgt == -1) {
314 disallow_getting_krbtgt =
315 krb5_config_get_bool_default(kcm_context, NULL, FALSE, "kcm",
316 "disallow-getting-krbtgt", NULL);
317 }
318
319 /* enqueue default actions for credentials cache */
320 ret = kcm_ccache_enqueue_default(kcm_context, ccache, NULL);
321
322 kcm_release_ccache(kcm_context, ccache); /* retained by event queue */
323
324 return ret;
325 }
326
327 void
kcm_configure(int argc,char ** argv)328 kcm_configure(int argc, char **argv)
329 {
330 krb5_error_code ret;
331 int optidx = 0;
332 const char *p;
333
334 while (getarg(args, num_args, argc, argv, &optidx))
335 warnx("error at argument `%s'", argv[optidx]);
336
337 if (help_flag)
338 usage (0);
339
340 if (version_flag) {
341 print_version(NULL);
342 exit(0);
343 }
344
345 argc -= optidx;
346 #ifndef __clang_analyzer__
347 argv += optidx;
348 #endif
349
350 if (argc != 0)
351 usage(1);
352
353 {
354 char **files;
355
356 if(config_file == NULL)
357 config_file = _PATH_KCM_CONF;
358
359 ret = krb5_prepend_config_files_default(config_file, &files);
360 if (ret)
361 krb5_err(kcm_context, 1, ret, "getting configuration files");
362
363 ret = krb5_set_config_files(kcm_context, files);
364 krb5_free_config_files(files);
365 if(ret)
366 krb5_err(kcm_context, 1, ret, "reading configuration files");
367 }
368
369 if(max_request_str)
370 max_request = parse_bytes(max_request_str, NULL);
371
372 if(max_request == 0){
373 p = krb5_config_get_string (kcm_context,
374 NULL,
375 "kcm",
376 "max-request",
377 NULL);
378 if(p)
379 max_request = parse_bytes(p, NULL);
380 }
381
382 if (system_principal == NULL) {
383 system_principal = kcm_system_config_get_string("principal");
384 }
385
386 if (system_principal != NULL) {
387 ret = ccache_init_system();
388 if (ret)
389 krb5_err(kcm_context, 1, ret, "initializing system ccache");
390 }
391
392 if(detach_from_console == -1)
393 detach_from_console = krb5_config_get_bool_default(kcm_context, NULL,
394 FALSE,
395 "kcm",
396 "detach", NULL);
397 kcm_openlog();
398 if(max_request == 0)
399 max_request = 64 * 1024;
400 }
401
402