xref: /freebsd/crypto/heimdal/lib/krb5/verify_krb5_conf.c (revision b077aed33b7b6aefca7b17ddb250cf521f938613)
1 /*
2  * Copyright (c) 1999 - 2005 Kungliga Tekniska Högskolan
3  * (Royal Institute of Technology, Stockholm, Sweden).
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * 3. Neither the name of the Institute nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #include "krb5_locl.h"
35 #include <getarg.h>
36 #include <parse_bytes.h>
37 #include <err.h>
38 
39 /* verify krb5.conf */
40 
41 static int dumpconfig_flag = 0;
42 static int version_flag = 0;
43 static int help_flag	= 0;
44 static int warn_mit_syntax_flag = 0;
45 
46 static struct getargs args[] = {
47     {"dumpconfig", 0,      arg_flag,       &dumpconfig_flag,
48      "show the parsed config files", NULL },
49     {"warn-mit-syntax", 0, arg_flag,       &warn_mit_syntax_flag,
50      "show the parsed config files", NULL },
51     {"version",	0,	arg_flag,	&version_flag,
52      "print version", NULL },
53     {"help",	0,	arg_flag,	&help_flag,
54      NULL, NULL }
55 };
56 
57 static void
58 usage (int ret)
59 {
60     arg_printusage (args,
61 		    sizeof(args)/sizeof(*args),
62 		    NULL,
63 		    "[config-file]");
64     exit (ret);
65 }
66 
67 static int
68 check_bytes(krb5_context context, const char *path, char *data)
69 {
70     if(parse_bytes(data, NULL) == -1) {
71 	krb5_warnx(context, "%s: failed to parse \"%s\" as size", path, data);
72 	return 1;
73     }
74     return 0;
75 }
76 
77 static int
78 check_time(krb5_context context, const char *path, char *data)
79 {
80     if(parse_time(data, NULL) == -1) {
81 	krb5_warnx(context, "%s: failed to parse \"%s\" as time", path, data);
82 	return 1;
83     }
84     return 0;
85 }
86 
87 static int
88 check_numeric(krb5_context context, const char *path, char *data)
89 {
90     long v;
91     char *end;
92     v = strtol(data, &end, 0);
93 
94     if ((v == LONG_MIN || v == LONG_MAX) && errno != 0) {
95 	krb5_warnx(context, "%s: over/under flow for \"%s\"",
96 		   path, data);
97 	return 1;
98     }
99     if(*end != '\0') {
100 	krb5_warnx(context, "%s: failed to parse \"%s\" as a number",
101 		   path, data);
102 	return 1;
103     }
104     return 0;
105 }
106 
107 static int
108 check_boolean(krb5_context context, const char *path, char *data)
109 {
110     long int v;
111     char *end;
112     if(strcasecmp(data, "yes") == 0 ||
113        strcasecmp(data, "true") == 0 ||
114        strcasecmp(data, "no") == 0 ||
115        strcasecmp(data, "false") == 0)
116 	return 0;
117     v = strtol(data, &end, 0);
118     if(*end != '\0') {
119 	krb5_warnx(context, "%s: failed to parse \"%s\" as a boolean",
120 		   path, data);
121 	return 1;
122     }
123     if(v != 0 && v != 1)
124 	krb5_warnx(context, "%s: numeric value \"%s\" is treated as \"true\"",
125 		   path, data);
126     return 0;
127 }
128 
129 static int
130 check_524(krb5_context context, const char *path, char *data)
131 {
132     if(strcasecmp(data, "yes") == 0 ||
133        strcasecmp(data, "no") == 0 ||
134        strcasecmp(data, "2b") == 0 ||
135        strcasecmp(data, "local") == 0)
136 	return 0;
137 
138     krb5_warnx(context, "%s: didn't contain a valid option `%s'",
139 	       path, data);
140     return 1;
141 }
142 
143 static int
144 check_host(krb5_context context, const char *path, char *data)
145 {
146     int ret;
147     char hostname[128];
148     const char *p = data;
149     struct addrinfo hints;
150     char service[32];
151     int defport;
152     struct addrinfo *ai;
153 
154     hints.ai_flags = 0;
155     hints.ai_family = PF_UNSPEC;
156     hints.ai_socktype = 0;
157     hints.ai_protocol = 0;
158 
159     hints.ai_addrlen = 0;
160     hints.ai_canonname = NULL;
161     hints.ai_addr = NULL;
162     hints.ai_next = NULL;
163 
164     /* XXX data could be a list of hosts that this code can't handle */
165     /* XXX copied from krbhst.c */
166     if(strncmp(p, "http://", 7) == 0){
167         p += 7;
168 	hints.ai_socktype = SOCK_STREAM;
169 	strlcpy(service, "http", sizeof(service));
170 	defport = 80;
171     } else if(strncmp(p, "http/", 5) == 0) {
172         p += 5;
173 	hints.ai_socktype = SOCK_STREAM;
174 	strlcpy(service, "http", sizeof(service));
175 	defport = 80;
176     }else if(strncmp(p, "tcp/", 4) == 0){
177         p += 4;
178 	hints.ai_socktype = SOCK_STREAM;
179 	strlcpy(service, "kerberos", sizeof(service));
180 	defport = 88;
181     } else if(strncmp(p, "udp/", 4) == 0) {
182         p += 4;
183 	hints.ai_socktype = SOCK_DGRAM;
184 	strlcpy(service, "kerberos", sizeof(service));
185 	defport = 88;
186     } else {
187 	hints.ai_socktype = SOCK_DGRAM;
188 	strlcpy(service, "kerberos", sizeof(service));
189 	defport = 88;
190     }
191     if(strsep_copy(&p, ":", hostname, sizeof(hostname)) < 0) {
192 	return 1;
193     }
194     hostname[strcspn(hostname, "/")] = '\0';
195     if(p != NULL) {
196 	char *end;
197 	int tmp = strtol(p, &end, 0);
198 	if(end == p) {
199 	    krb5_warnx(context, "%s: failed to parse port number in %s",
200 		       path, data);
201 	    return 1;
202 	}
203 	defport = tmp;
204 	snprintf(service, sizeof(service), "%u", defport);
205     }
206     ret = getaddrinfo(hostname, service, &hints, &ai);
207     if(ret == EAI_SERVICE && !isdigit((unsigned char)service[0])) {
208 	snprintf(service, sizeof(service), "%u", defport);
209 	ret = getaddrinfo(hostname, service, &hints, &ai);
210     }
211     if(ret != 0) {
212 	krb5_warnx(context, "%s: %s (%s)", path, gai_strerror(ret), hostname);
213 	return 1;
214     }
215     return 0;
216 }
217 
218 static int
219 mit_entry(krb5_context context, const char *path, char *data)
220 {
221     if (warn_mit_syntax_flag)
222 	krb5_warnx(context, "%s is only used by MIT Kerberos", path);
223     return 0;
224 }
225 
226 struct s2i {
227     const char *s;
228     int val;
229 };
230 
231 #define L(X) { #X, LOG_ ## X }
232 
233 static struct s2i syslogvals[] = {
234     /* severity */
235     L(EMERG),
236     L(ALERT),
237     L(CRIT),
238     L(ERR),
239     L(WARNING),
240     L(NOTICE),
241     L(INFO),
242     L(DEBUG),
243     /* facility */
244     L(AUTH),
245 #ifdef LOG_AUTHPRIV
246     L(AUTHPRIV),
247 #endif
248 #ifdef LOG_CRON
249     L(CRON),
250 #endif
251     L(DAEMON),
252 #ifdef LOG_FTP
253     L(FTP),
254 #endif
255     L(KERN),
256     L(LPR),
257     L(MAIL),
258 #ifdef LOG_NEWS
259     L(NEWS),
260 #endif
261     L(SYSLOG),
262     L(USER),
263 #ifdef LOG_UUCP
264     L(UUCP),
265 #endif
266     L(LOCAL0),
267     L(LOCAL1),
268     L(LOCAL2),
269     L(LOCAL3),
270     L(LOCAL4),
271     L(LOCAL5),
272     L(LOCAL6),
273     L(LOCAL7),
274     { NULL, -1 }
275 };
276 
277 static int
278 find_value(const char *s, struct s2i *table)
279 {
280     while(table->s && strcasecmp(table->s, s))
281 	table++;
282     return table->val;
283 }
284 
285 static int
286 check_log(krb5_context context, const char *path, char *data)
287 {
288     /* XXX sync with log.c */
289     int min = 0, max = -1, n;
290     char c;
291     const char *p = data;
292 
293     n = sscanf(p, "%d%c%d/", &min, &c, &max);
294     if(n == 2){
295 	if(c == '/') {
296 	    if(min < 0){
297 		max = -min;
298 		min = 0;
299 	    }else{
300 		max = min;
301 	    }
302 	}
303     }
304     if(n){
305 	p = strchr(p, '/');
306 	if(p == NULL) {
307 	    krb5_warnx(context, "%s: failed to parse \"%s\"", path, data);
308 	    return 1;
309 	}
310 	p++;
311     }
312     if(strcmp(p, "STDERR") == 0 ||
313        strcmp(p, "CONSOLE") == 0 ||
314        (strncmp(p, "FILE", 4) == 0 && (p[4] == ':' || p[4] == '=')) ||
315        (strncmp(p, "DEVICE", 6) == 0 && p[6] == '='))
316 	return 0;
317     if(strncmp(p, "SYSLOG", 6) == 0){
318 	int ret = 0;
319 	char severity[128] = "";
320 	char facility[128] = "";
321 	p += 6;
322 	if(*p != '\0')
323 	    p++;
324 	if(strsep_copy(&p, ":", severity, sizeof(severity)) != -1)
325 	    strsep_copy(&p, ":", facility, sizeof(facility));
326 	if(*severity == '\0')
327 	    strlcpy(severity, "ERR", sizeof(severity));
328  	if(*facility == '\0')
329 	    strlcpy(facility, "AUTH", sizeof(facility));
330 	if(find_value(severity, syslogvals) == -1) {
331 	    krb5_warnx(context, "%s: unknown syslog facility \"%s\"",
332 		       path, facility);
333 	    ret++;
334 	}
335 	if(find_value(severity, syslogvals) == -1) {
336 	    krb5_warnx(context, "%s: unknown syslog severity \"%s\"",
337 		       path, severity);
338 	    ret++;
339 	}
340 	return ret;
341     }else{
342 	krb5_warnx(context, "%s: unknown log type: \"%s\"", path, data);
343 	return 1;
344     }
345 }
346 
347 typedef int (*check_func_t)(krb5_context, const char*, char*);
348 struct entry {
349     const char *name;
350     int type;
351     void *check_data;
352     int deprecated;
353 };
354 
355 struct entry all_strings[] = {
356     { "", krb5_config_string, NULL },
357     { NULL }
358 };
359 
360 struct entry all_boolean[] = {
361     { "", krb5_config_string, check_boolean },
362     { NULL }
363 };
364 
365 
366 struct entry v4_name_convert_entries[] = {
367     { "host", krb5_config_list, all_strings },
368     { "plain", krb5_config_list, all_strings },
369     { NULL }
370 };
371 
372 struct entry libdefaults_entries[] = {
373     { "accept_null_addresses", krb5_config_string, check_boolean },
374     { "allow_weak_crypto", krb5_config_string, check_boolean },
375     { "capath", krb5_config_list, all_strings, 1 },
376     { "check_pac", krb5_config_string, check_boolean },
377     { "clockskew", krb5_config_string, check_time },
378     { "date_format", krb5_config_string, NULL },
379     { "default_cc_name", krb5_config_string, NULL },
380     { "default_etypes", krb5_config_string, NULL },
381     { "default_etypes_des", krb5_config_string, NULL },
382     { "default_keytab_modify_name", krb5_config_string, NULL },
383     { "default_keytab_name", krb5_config_string, NULL },
384     { "default_realm", krb5_config_string, NULL },
385     { "dns_canonize_hostname", krb5_config_string, check_boolean },
386     { "dns_proxy", krb5_config_string, NULL },
387     { "dns_lookup_kdc", krb5_config_string, check_boolean },
388     { "dns_lookup_realm", krb5_config_string, check_boolean },
389     { "dns_lookup_realm_labels", krb5_config_string, NULL },
390     { "egd_socket", krb5_config_string, NULL },
391     { "encrypt", krb5_config_string, check_boolean },
392     { "extra_addresses", krb5_config_string, NULL },
393     { "fcache_version", krb5_config_string, check_numeric },
394     { "fcc-mit-ticketflags", krb5_config_string, check_boolean },
395     { "forward", krb5_config_string, check_boolean },
396     { "forwardable", krb5_config_string, check_boolean },
397     { "http_proxy", krb5_config_string, check_host /* XXX */ },
398     { "ignore_addresses", krb5_config_string, NULL },
399     { "kdc_timeout", krb5_config_string, check_time },
400     { "kdc_timesync", krb5_config_string, check_boolean },
401     { "log_utc", krb5_config_string, check_boolean },
402     { "maxretries", krb5_config_string, check_numeric },
403     { "scan_interfaces", krb5_config_string, check_boolean },
404     { "srv_lookup", krb5_config_string, check_boolean },
405     { "srv_try_txt", krb5_config_string, check_boolean },
406     { "ticket_lifetime", krb5_config_string, check_time },
407     { "time_format", krb5_config_string, NULL },
408     { "transited_realms_reject", krb5_config_string, NULL },
409     { "no-addresses", krb5_config_string, check_boolean },
410     { "v4_instance_resolve", krb5_config_string, check_boolean },
411     { "v4_name_convert", krb5_config_list, v4_name_convert_entries },
412     { "verify_ap_req_nofail", krb5_config_string, check_boolean },
413     { "max_retries", krb5_config_string, check_time },
414     { "renew_lifetime", krb5_config_string, check_time },
415     { "proxiable", krb5_config_string, check_boolean },
416     { "warn_pwexpire", krb5_config_string, check_time },
417     /* MIT stuff */
418     { "permitted_enctypes", krb5_config_string, mit_entry },
419     { "default_tgs_enctypes", krb5_config_string, mit_entry },
420     { "default_tkt_enctypes", krb5_config_string, mit_entry },
421     { NULL }
422 };
423 
424 struct entry appdefaults_entries[] = {
425     { "afslog", krb5_config_string, check_boolean },
426     { "afs-use-524", krb5_config_string, check_524 },
427     { "encrypt", krb5_config_string, check_boolean },
428     { "forward", krb5_config_string, check_boolean },
429     { "forwardable", krb5_config_string, check_boolean },
430     { "proxiable", krb5_config_string, check_boolean },
431     { "ticket_lifetime", krb5_config_string, check_time },
432     { "renew_lifetime", krb5_config_string, check_time },
433     { "no-addresses", krb5_config_string, check_boolean },
434     { "krb4_get_tickets", krb5_config_string, check_boolean },
435     { "pkinit_anchors", krb5_config_string, NULL },
436     { "pkinit_win2k", krb5_config_string, NULL },
437     { "pkinit_win2k_require_binding", krb5_config_string, NULL },
438     { "pkinit_require_eku", krb5_config_string, NULL },
439     { "pkinit_require_krbtgt_otherName", krb5_config_string, NULL },
440     { "pkinit_require_hostname_match", krb5_config_string, NULL },
441 #if 0
442     { "anonymous", krb5_config_string, check_boolean },
443 #endif
444     { "", krb5_config_list, appdefaults_entries },
445     { NULL }
446 };
447 
448 struct entry realms_entries[] = {
449     { "forwardable", krb5_config_string, check_boolean },
450     { "proxiable", krb5_config_string, check_boolean },
451     { "ticket_lifetime", krb5_config_string, check_time },
452     { "renew_lifetime", krb5_config_string, check_time },
453     { "warn_pwexpire", krb5_config_string, check_time },
454     { "kdc", krb5_config_string, check_host },
455     { "admin_server", krb5_config_string, check_host },
456     { "kpasswd_server", krb5_config_string, check_host },
457     { "krb524_server", krb5_config_string, check_host },
458     { "v4_name_convert", krb5_config_list, v4_name_convert_entries },
459     { "v4_instance_convert", krb5_config_list, all_strings },
460     { "v4_domains", krb5_config_string, NULL },
461     { "default_domain", krb5_config_string, NULL },
462     { "win2k_pkinit", krb5_config_string, NULL },
463     /* MIT stuff */
464     { "admin_keytab", krb5_config_string, mit_entry },
465     { "acl_file", krb5_config_string, mit_entry },
466     { "dict_file", krb5_config_string, mit_entry },
467     { "kadmind_port", krb5_config_string, mit_entry },
468     { "kpasswd_port", krb5_config_string, mit_entry },
469     { "master_key_name", krb5_config_string, mit_entry },
470     { "master_key_type", krb5_config_string, mit_entry },
471     { "key_stash_file", krb5_config_string, mit_entry },
472     { "max_life", krb5_config_string, mit_entry },
473     { "max_renewable_life", krb5_config_string, mit_entry },
474     { "default_principal_expiration", krb5_config_string, mit_entry },
475     { "default_principal_flags", krb5_config_string, mit_entry },
476     { "supported_enctypes", krb5_config_string, mit_entry },
477     { "database_name", krb5_config_string, mit_entry },
478     { NULL }
479 };
480 
481 struct entry realms_foobar[] = {
482     { "", krb5_config_list, realms_entries },
483     { NULL }
484 };
485 
486 
487 struct entry kdc_database_entries[] = {
488     { "realm", krb5_config_string, NULL },
489     { "dbname", krb5_config_string, NULL },
490     { "mkey_file", krb5_config_string, NULL },
491     { "acl_file", krb5_config_string, NULL },
492     { "log_file", krb5_config_string, NULL },
493     { NULL }
494 };
495 
496 struct entry kdc_entries[] = {
497     { "database", krb5_config_list, kdc_database_entries },
498     { "key-file", krb5_config_string, NULL },
499     { "logging", krb5_config_string, check_log },
500     { "max-request", krb5_config_string, check_bytes },
501     { "require-preauth", krb5_config_string, check_boolean },
502     { "ports", krb5_config_string, NULL },
503     { "addresses", krb5_config_string, NULL },
504     { "enable-kerberos4", krb5_config_string, check_boolean },
505     { "enable-524", krb5_config_string, check_boolean },
506     { "enable-http", krb5_config_string, check_boolean },
507     { "check-ticket-addresses", krb5_config_string, check_boolean },
508     { "allow-null-ticket-addresses", krb5_config_string, check_boolean },
509     { "allow-anonymous", krb5_config_string, check_boolean },
510     { "v4_realm", krb5_config_string, NULL },
511     { "enable-kaserver", krb5_config_string, check_boolean, 1 },
512     { "encode_as_rep_as_tgs_rep", krb5_config_string, check_boolean },
513     { "kdc_warn_pwexpire", krb5_config_string, check_time },
514     { "use_2b", krb5_config_list, NULL },
515     { "enable-pkinit", krb5_config_string, check_boolean },
516     { "pkinit_identity", krb5_config_string, NULL },
517     { "pkinit_anchors", krb5_config_string, NULL },
518     { "pkinit_pool", krb5_config_string, NULL },
519     { "pkinit_revoke", krb5_config_string, NULL },
520     { "pkinit_kdc_ocsp", krb5_config_string, NULL },
521     { "pkinit_principal_in_certificate", krb5_config_string, NULL },
522     { "pkinit_dh_min_bits", krb5_config_string, NULL },
523     { "pkinit_allow_proxy_certificate", krb5_config_string, NULL },
524     { "hdb-ldap-create-base", krb5_config_string, NULL },
525     { "v4-realm", krb5_config_string, NULL },
526     { NULL }
527 };
528 
529 struct entry kadmin_entries[] = {
530     { "password_lifetime", krb5_config_string, check_time },
531     { "default_keys", krb5_config_string, NULL },
532     { "use_v4_salt", krb5_config_string, NULL },
533     { "require-preauth", krb5_config_string, check_boolean },
534     { NULL }
535 };
536 struct entry log_strings[] = {
537     { "", krb5_config_string, check_log },
538     { NULL }
539 };
540 
541 
542 /* MIT stuff */
543 struct entry kdcdefaults_entries[] = {
544     { "kdc_ports", krb5_config_string, mit_entry },
545     { "v4_mode", krb5_config_string, mit_entry },
546     { NULL }
547 };
548 
549 struct entry capaths_entries[] = {
550     { "", krb5_config_list, all_strings },
551     { NULL }
552 };
553 
554 struct entry password_quality_entries[] = {
555     { "policies", krb5_config_string, NULL },
556     { "external_program", krb5_config_string, NULL },
557     { "min_classes", krb5_config_string, check_numeric },
558     { "min_length", krb5_config_string, check_numeric },
559     { "", krb5_config_list, all_strings },
560     { NULL }
561 };
562 
563 struct entry toplevel_sections[] = {
564     { "libdefaults" , krb5_config_list, libdefaults_entries },
565     { "realms", krb5_config_list, realms_foobar },
566     { "domain_realm", krb5_config_list, all_strings },
567     { "logging", krb5_config_list, log_strings },
568     { "kdc", krb5_config_list, kdc_entries },
569     { "kadmin", krb5_config_list, kadmin_entries },
570     { "appdefaults", krb5_config_list, appdefaults_entries },
571     { "gssapi", krb5_config_list, NULL },
572     { "capaths", krb5_config_list, capaths_entries },
573     { "password_quality", krb5_config_list, password_quality_entries },
574     /* MIT stuff */
575     { "kdcdefaults", krb5_config_list, kdcdefaults_entries },
576     { NULL }
577 };
578 
579 
580 static int
581 check_section(krb5_context context, const char *path, krb5_config_section *cf,
582 	      struct entry *entries)
583 {
584     int error = 0;
585     krb5_config_section *p;
586     struct entry *e;
587 
588     char *local;
589 
590     for(p = cf; p != NULL; p = p->next) {
591 	local = NULL;
592 	if (asprintf(&local, "%s/%s", path, p->name) < 0 || local == NULL)
593 	    errx(1, "out of memory");
594 	for(e = entries; e->name != NULL; e++) {
595 	    if(*e->name == '\0' || strcmp(e->name, p->name) == 0) {
596 		if(e->type != p->type) {
597 		    krb5_warnx(context, "%s: unknown or wrong type", local);
598 		    error |= 1;
599 		} else if(p->type == krb5_config_string && e->check_data != NULL) {
600 		    error |= (*(check_func_t)e->check_data)(context, local, p->u.string);
601 		} else if(p->type == krb5_config_list && e->check_data != NULL) {
602 		    error |= check_section(context, local, p->u.list, e->check_data);
603 		}
604 		if(e->deprecated) {
605 		    krb5_warnx(context, "%s: is a deprecated entry", local);
606 		    error |= 1;
607 		}
608 		break;
609 	    }
610 	}
611 	if(e->name == NULL) {
612 	    krb5_warnx(context, "%s: unknown entry", local);
613 	    error |= 1;
614 	}
615 	free(local);
616     }
617     return error;
618 }
619 
620 
621 static void
622 dumpconfig(int level, krb5_config_section *top)
623 {
624     krb5_config_section *x;
625     for(x = top; x; x = x->next) {
626 	switch(x->type) {
627 	case krb5_config_list:
628 	    if(level == 0) {
629 		printf("[%s]\n", x->name);
630 	    } else {
631 		printf("%*s%s = {\n", 4 * level, " ", x->name);
632 	    }
633 	    dumpconfig(level + 1, x->u.list);
634 	    if(level > 0)
635 		printf("%*s}\n", 4 * level, " ");
636 	    break;
637 	case krb5_config_string:
638 	    printf("%*s%s = %s\n", 4 * level, " ", x->name, x->u.string);
639 	    break;
640 	}
641     }
642 }
643 
644 int
645 main(int argc, char **argv)
646 {
647     krb5_context context;
648     krb5_error_code ret;
649     krb5_config_section *tmp_cf;
650     int optidx = 0;
651 
652     setprogname (argv[0]);
653 
654     ret = krb5_init_context(&context);
655     if (ret == KRB5_CONFIG_BADFORMAT)
656 	errx (1, "krb5_init_context failed to parse configuration file");
657     else if (ret)
658 	errx (1, "krb5_init_context failed with %d", ret);
659 
660     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
661 	usage(1);
662 
663     if (help_flag)
664 	usage (0);
665 
666     if(version_flag){
667 	print_version(NULL);
668 	exit(0);
669     }
670 
671     argc -= optidx;
672     argv += optidx;
673 
674     tmp_cf = NULL;
675     if(argc == 0)
676 	krb5_get_default_config_files(&argv);
677 
678     while(*argv) {
679 	ret = krb5_config_parse_file_multi(context, *argv, &tmp_cf);
680 	if (ret != 0)
681 	    krb5_warn (context, ret, "krb5_config_parse_file");
682 	argv++;
683     }
684 
685     if(dumpconfig_flag)
686 	dumpconfig(0, tmp_cf);
687 
688     return check_section(context, "", tmp_cf, toplevel_sections);
689 }
690