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
41static const char *config_file;	/* location of kcm config file */
42
43size_t max_request = 0;		/* maximal size of a request */
44char *socket_path = NULL;
45char *door_path = NULL;
46
47static char *max_request_str;	/* `max_request' as a string */
48
49int detach_from_console = -1;
50int daemon_child = -1;
51
52static const char *system_cache_name = NULL;
53static const char *system_keytab = NULL;
54static const char *system_principal = NULL;
55static const char *system_server = NULL;
56static const char *system_perms = NULL;
57static const char *system_user = NULL;
58static const char *system_group = NULL;
59
60static const char *renew_life = NULL;
61static const char *ticket_life = NULL;
62
63int launchd_flag = 0;
64int disallow_getting_krbtgt = 0;
65int name_constraints = -1;
66
67static int help_flag;
68static int version_flag;
69
70static 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
149static int num_args = sizeof(args) / sizeof(args[0]);
150
151static void
152usage(int ret)
153{
154    arg_printusage (args, num_args, NULL, "");
155    exit (ret);
156}
157
158static 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
217static const char *
218kcm_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
224static krb5_error_code
225ccache_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
327void
328kcm_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