1/*	$NetBSD: config.c,v 1.1.1.1 2011/04/13 18:14:36 elric Exp $	*/
2
3/*
4 * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 *
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * 3. Neither the name of the Institute nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38#include "kdc_locl.h"
39#include <krb5/getarg.h>
40#include <krb5/parse_bytes.h>
41
42struct dbinfo {
43    char *realm;
44    char *dbname;
45    char *mkey_file;
46    struct dbinfo *next;
47};
48
49static char *config_file;	/* location of kdc config file */
50
51static int require_preauth = -1; /* 1 == require preauth for all principals */
52static char *max_request_str;	/* `max_request' as a string */
53
54static int disable_des = -1;
55static int enable_v4 = -1;
56static int enable_kaserver = -1;
57static int enable_524 = -1;
58static int enable_v4_cross_realm = -1;
59
60static int builtin_hdb_flag;
61static int help_flag;
62static int version_flag;
63
64static struct getarg_strings addresses_str;	/* addresses to listen on */
65
66static char *v4_realm;
67
68char *runas_string;
69char *chroot_string;
70
71
72static struct getargs args[] = {
73    {
74	"config-file",	'c',	arg_string,	&config_file,
75	"location of config file",	"file"
76    },
77    {
78	"require-preauth",	'p',	arg_negative_flag, &require_preauth,
79	"don't require pa-data in as-reqs"
80    },
81    {
82	"max-request",	0,	arg_string, &max_request_str,
83	"max size for a kdc-request", "size"
84    },
85    { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support" },
86    {	"524",		0, 	arg_negative_flag, &enable_524,
87	"don't respond to 524 requests"
88    },
89    {
90	"kaserver", 'K', arg_flag,   &enable_kaserver,
91	"enable kaserver support"
92    },
93    {	"kerberos4",	0, 	arg_flag, &enable_v4,
94	"respond to kerberos 4 requests"
95    },
96    {
97	"v4-realm",	'r',	arg_string, &v4_realm,
98	"realm to serve v4-requests for"
99    },
100    {	"kerberos4-cross-realm",	0, 	arg_flag,
101	&enable_v4_cross_realm,
102	"respond to kerberos 4 requests from foreign realms"
103    },
104    {	"ports",	'P', 	arg_string, rk_UNCONST(&port_str),
105	"ports to listen to", "portspec"
106    },
107#ifdef SUPPORT_DETACH
108#if DETACH_IS_DEFAULT
109    {
110	"detach",       'D',      arg_negative_flag, &detach_from_console,
111	"don't detach from console"
112    },
113#else
114    {
115	"detach",       0 ,      arg_flag, &detach_from_console,
116	"detach from console"
117    },
118#endif
119#endif
120    {	"addresses",	0,	arg_strings, &addresses_str,
121	"addresses to listen on", "list of addresses" },
122    {	"disable-des",	0,	arg_flag, &disable_des,
123	"disable DES" },
124    {	"builtin-hdb",	0,	arg_flag,   &builtin_hdb_flag,
125	"list builtin hdb backends"},
126    {   "runas-user",	0,	arg_string, &runas_string,
127	"run as this user when connected to network"
128    },
129    {   "chroot",	0,	arg_string, &chroot_string,
130	"chroot directory to run in"
131    },
132    {	"help",		'h',	arg_flag,   &help_flag },
133    {	"version",	'v',	arg_flag,   &version_flag }
134};
135
136static int num_args = sizeof(args) / sizeof(args[0]);
137
138static void
139usage(int ret)
140{
141    arg_printusage (args, num_args, NULL, "");
142    exit (ret);
143}
144
145static void
146add_one_address (krb5_context context, const char *str, int first)
147{
148    krb5_error_code ret;
149    krb5_addresses tmp;
150
151    ret = krb5_parse_address (context, str, &tmp);
152    if (ret)
153	krb5_err (context, 1, ret, "parse_address `%s'", str);
154    if (first)
155	krb5_copy_addresses(context, &tmp, &explicit_addresses);
156    else
157	krb5_append_addresses(context, &explicit_addresses, &tmp);
158    krb5_free_addresses (context, &tmp);
159}
160
161krb5_kdc_configuration *
162configure(krb5_context context, int argc, char **argv)
163{
164    krb5_kdc_configuration *config;
165    krb5_error_code ret;
166    int optidx = 0;
167    const char *p;
168
169    while(getarg(args, num_args, argc, argv, &optidx))
170	warnx("error at argument `%s'", argv[optidx]);
171
172    if(help_flag)
173	usage (0);
174
175    if (version_flag) {
176	print_version(NULL);
177	exit(0);
178    }
179
180    if (builtin_hdb_flag) {
181	char *list;
182	ret = hdb_list_builtin(context, &list);
183	if (ret)
184	    krb5_err(context, 1, ret, "listing builtin hdb backends");
185	printf("builtin hdb backends: %s\n", list);
186	free(list);
187	exit(0);
188    }
189
190    argc -= optidx;
191    argv += optidx;
192
193    if (argc != 0)
194	usage(1);
195
196    {
197	char **files;
198
199	if (config_file == NULL) {
200	    asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
201	    if (config_file == NULL)
202		errx(1, "out of memory");
203	}
204
205	ret = krb5_prepend_config_files_default(config_file, &files);
206	if (ret)
207	    krb5_err(context, 1, ret, "getting configuration files");
208
209	ret = krb5_set_config_files(context, files);
210	krb5_free_config_files(files);
211	if(ret)
212	    krb5_err(context, 1, ret, "reading configuration files");
213    }
214
215    ret = krb5_kdc_get_config(context, &config);
216    if (ret)
217	krb5_err(context, 1, ret, "krb5_kdc_default_config");
218
219    kdc_openlog(context, "kdc", config);
220
221    ret = krb5_kdc_set_dbinfo(context, config);
222    if (ret)
223	krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
224
225    if(max_request_str)
226	max_request_tcp = max_request_udp = parse_bytes(max_request_str, NULL);
227
228    if(max_request_tcp == 0){
229	p = krb5_config_get_string (context,
230				    NULL,
231				    "kdc",
232				    "max-request",
233				    NULL);
234	if(p)
235	    max_request_tcp = max_request_udp = parse_bytes(p, NULL);
236    }
237
238    if(require_preauth != -1)
239	config->require_preauth = require_preauth;
240
241    if(port_str == NULL){
242	p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
243	if (p != NULL)
244	    port_str = strdup(p);
245    }
246
247    explicit_addresses.len = 0;
248
249    if (addresses_str.num_strings) {
250	int i;
251
252	for (i = 0; i < addresses_str.num_strings; ++i)
253	    add_one_address (context, addresses_str.strings[i], i == 0);
254	free_getarg_strings (&addresses_str);
255    } else {
256	char **foo = krb5_config_get_strings (context, NULL,
257					      "kdc", "addresses", NULL);
258
259	if (foo != NULL) {
260	    add_one_address (context, *foo++, TRUE);
261	    while (*foo)
262		add_one_address (context, *foo++, FALSE);
263	}
264    }
265
266    if(enable_v4 != -1)
267	config->enable_v4 = enable_v4;
268
269    if(enable_v4_cross_realm != -1)
270	config->enable_v4_cross_realm = enable_v4_cross_realm;
271
272    if(enable_524 != -1)
273	config->enable_524 = enable_524;
274
275    if(enable_http == -1)
276	enable_http = krb5_config_get_bool(context, NULL, "kdc",
277					   "enable-http", NULL);
278
279    if(request_log == NULL)
280	request_log = krb5_config_get_string(context, NULL,
281					     "kdc",
282					     "kdc-request-log",
283					     NULL);
284
285    if (krb5_config_get_string(context, NULL, "kdc",
286			       "enforce-transited-policy", NULL))
287	krb5_errx(context, 1, "enforce-transited-policy deprecated, "
288		  "use [kdc]transited-policy instead");
289
290    if (enable_kaserver != -1)
291	config->enable_kaserver = enable_kaserver;
292
293#ifdef SUPPORT_DETACH
294    if(detach_from_console == -1)
295	detach_from_console = krb5_config_get_bool_default(context, NULL,
296							   DETACH_IS_DEFAULT,
297							   "kdc",
298							   "detach", NULL);
299#endif /* SUPPORT_DETACH */
300
301    if(max_request_tcp == 0)
302	max_request_tcp = 64 * 1024;
303    if(max_request_udp == 0)
304	max_request_udp = 64 * 1024;
305
306    if (port_str == NULL)
307	port_str = "+";
308
309    if (v4_realm)
310	config->v4_realm = v4_realm;
311
312    if(config->v4_realm == NULL && (config->enable_kaserver || config->enable_v4))
313	krb5_errx(context, 1, "Kerberos 4 enabled but no realm configured");
314
315    if(disable_des == -1)
316	disable_des = krb5_config_get_bool_default(context, NULL,
317						   FALSE,
318						   "kdc",
319						   "disable-des", NULL);
320    if(disable_des) {
321	krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
322	krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
323	krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
324	krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
325	krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
326	krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
327
328	kdc_log(context, config,
329		0, "DES was disabled, turned off Kerberos V4, 524 "
330		"and kaserver");
331	config->enable_v4 = 0;
332	config->enable_524 = 0;
333	config->enable_kaserver = 0;
334    }
335
336    krb5_kdc_windc_init(context);
337
338    krb5_kdc_pkinit_config(context, config);
339
340    return config;
341}
342