1/*	$NetBSD: print.c,v 1.1.1.1 2011/04/13 18:15:12 elric Exp $	*/
2
3/*
4 * Copyright (c) 2004 - 2007 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include "hx_locl.h"
37
38/**
39 * @page page_print Hx509 printing functions
40 *
41 * See the library functions here: @ref hx509_print
42 */
43
44struct hx509_validate_ctx_data {
45    int flags;
46    hx509_vprint_func vprint_func;
47    void *ctx;
48};
49
50struct cert_status {
51    unsigned int selfsigned:1;
52    unsigned int isca:1;
53    unsigned int isproxy:1;
54    unsigned int haveSAN:1;
55    unsigned int haveIAN:1;
56    unsigned int haveSKI:1;
57    unsigned int haveAKI:1;
58    unsigned int haveCRLDP:1;
59};
60
61
62/*
63 *
64 */
65
66static int
67Time2string(const Time *T, char **str)
68{
69    time_t t;
70    char *s;
71    struct tm *tm;
72
73    *str = NULL;
74    t = _hx509_Time2time_t(T);
75    tm = gmtime (&t);
76    s = malloc(30);
77    if (s == NULL)
78	return ENOMEM;
79    strftime(s, 30, "%Y-%m-%d %H:%M:%S", tm);
80    *str = s;
81    return 0;
82}
83
84/**
85 * Helper function to print on stdout for:
86 * - hx509_oid_print(),
87 * - hx509_bitstring_print(),
88 * - hx509_validate_ctx_set_print().
89 *
90 * @param ctx the context to the print function. If the ctx is NULL,
91 * stdout is used.
92 * @param fmt the printing format.
93 * @param va the argumet list.
94 *
95 * @ingroup hx509_print
96 */
97
98void
99hx509_print_stdout(void *ctx, const char *fmt, va_list va)
100{
101    FILE *f = ctx;
102    if (f == NULL)
103	f = stdout;
104    vfprintf(f, fmt, va);
105}
106
107static void
108print_func(hx509_vprint_func func, void *ctx, const char *fmt, ...)
109{
110    va_list va;
111    va_start(va, fmt);
112    (*func)(ctx, fmt, va);
113    va_end(va);
114}
115
116/**
117 * Print a oid to a string.
118 *
119 * @param oid oid to print
120 * @param str allocated string, free with hx509_xfree().
121 *
122 * @return An hx509 error code, see hx509_get_error_string().
123 *
124 * @ingroup hx509_print
125 */
126
127int
128hx509_oid_sprint(const heim_oid *oid, char **str)
129{
130    return der_print_heim_oid(oid, '.', str);
131}
132
133/**
134 * Print a oid using a hx509_vprint_func function. To print to stdout
135 * use hx509_print_stdout().
136 *
137 * @param oid oid to print
138 * @param func hx509_vprint_func to print with.
139 * @param ctx context variable to hx509_vprint_func function.
140 *
141 * @ingroup hx509_print
142 */
143
144void
145hx509_oid_print(const heim_oid *oid, hx509_vprint_func func, void *ctx)
146{
147    char *str;
148    hx509_oid_sprint(oid, &str);
149    print_func(func, ctx, "%s", str);
150    free(str);
151}
152
153/**
154 * Print a bitstring using a hx509_vprint_func function. To print to
155 * stdout use hx509_print_stdout().
156 *
157 * @param b bit string to print.
158 * @param func hx509_vprint_func to print with.
159 * @param ctx context variable to hx509_vprint_func function.
160 *
161 * @ingroup hx509_print
162 */
163
164void
165hx509_bitstring_print(const heim_bit_string *b,
166		      hx509_vprint_func func, void *ctx)
167{
168    int i;
169    print_func(func, ctx, "\tlength: %d\n\t", b->length);
170    for (i = 0; i < (b->length + 7) / 8; i++)
171	print_func(func, ctx, "%02x%s%s",
172		   ((unsigned char *)b->data)[i],
173		   i < (b->length - 7) / 8
174		   && (i == 0 || (i % 16) != 15) ? ":" : "",
175		   i != 0 && (i % 16) == 15 ?
176		   (i <= ((b->length + 7) / 8 - 2) ? "\n\t" : "\n"):"");
177}
178
179/**
180 * Print certificate usage for a certificate to a string.
181 *
182 * @param context A hx509 context.
183 * @param c a certificate print the keyusage for.
184 * @param s the return string with the keysage printed in to, free
185 * with hx509_xfree().
186 *
187 * @return An hx509 error code, see hx509_get_error_string().
188 *
189 * @ingroup hx509_print
190 */
191
192int
193hx509_cert_keyusage_print(hx509_context context, hx509_cert c, char **s)
194{
195    KeyUsage ku;
196    char buf[256];
197    int ret;
198
199    *s = NULL;
200
201    ret = _hx509_cert_get_keyusage(context, c, &ku);
202    if (ret)
203	return ret;
204    unparse_flags(KeyUsage2int(ku), asn1_KeyUsage_units(), buf, sizeof(buf));
205    *s = strdup(buf);
206    if (*s == NULL) {
207	hx509_set_error_string(context, 0, ENOMEM, "out of memory");
208	return ENOMEM;
209    }
210
211    return 0;
212}
213
214/*
215 *
216 */
217
218static void
219validate_vprint(void *c, const char *fmt, va_list va)
220{
221    hx509_validate_ctx ctx = c;
222    if (ctx->vprint_func == NULL)
223	return;
224    (ctx->vprint_func)(ctx->ctx, fmt, va);
225}
226
227static void
228validate_print(hx509_validate_ctx ctx, int flags, const char *fmt, ...)
229{
230    va_list va;
231    if ((ctx->flags & flags) == 0)
232	return;
233    va_start(va, fmt);
234    validate_vprint(ctx, fmt, va);
235    va_end(va);
236}
237
238/*
239 * Dont Care, SHOULD critical, SHOULD NOT critical, MUST critical,
240 * MUST NOT critical
241 */
242enum critical_flag { D_C = 0, S_C, S_N_C, M_C, M_N_C };
243
244static int
245check_Null(hx509_validate_ctx ctx,
246	   struct cert_status *status,
247	   enum critical_flag cf, const Extension *e)
248{
249    switch(cf) {
250    case D_C:
251	break;
252    case S_C:
253	if (!e->critical)
254	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
255			   "\tCritical not set on SHOULD\n");
256	break;
257    case S_N_C:
258	if (e->critical)
259	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
260			   "\tCritical set on SHOULD NOT\n");
261	break;
262    case M_C:
263	if (!e->critical)
264	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
265			   "\tCritical not set on MUST\n");
266	break;
267    case M_N_C:
268	if (e->critical)
269	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
270			   "\tCritical set on MUST NOT\n");
271	break;
272    default:
273	_hx509_abort("internal check_Null state error");
274    }
275    return 0;
276}
277
278static int
279check_subjectKeyIdentifier(hx509_validate_ctx ctx,
280			   struct cert_status *status,
281			   enum critical_flag cf,
282			   const Extension *e)
283{
284    SubjectKeyIdentifier si;
285    size_t size;
286    int ret;
287
288    status->haveSKI = 1;
289    check_Null(ctx, status, cf, e);
290
291    ret = decode_SubjectKeyIdentifier(e->extnValue.data,
292				      e->extnValue.length,
293				      &si, &size);
294    if (ret) {
295	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
296		       "Decoding SubjectKeyIdentifier failed: %d", ret);
297	return 1;
298    }
299    if (size != e->extnValue.length) {
300	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
301		       "Decoding SKI ahve extra bits on the end");
302	return 1;
303    }
304    if (si.length == 0)
305	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
306		       "SKI is too short (0 bytes)");
307    if (si.length > 20)
308	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
309		       "SKI is too long");
310
311    {
312	char *id;
313	hex_encode(si.data, si.length, &id);
314	if (id) {
315	    validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
316			   "\tsubject key id: %s\n", id);
317	    free(id);
318	}
319    }
320
321    free_SubjectKeyIdentifier(&si);
322
323    return 0;
324}
325
326static int
327check_authorityKeyIdentifier(hx509_validate_ctx ctx,
328			     struct cert_status *status,
329			     enum critical_flag cf,
330			     const Extension *e)
331{
332    AuthorityKeyIdentifier ai;
333    size_t size;
334    int ret;
335
336    status->haveAKI = 1;
337    check_Null(ctx, status, cf, e);
338
339    ret = decode_AuthorityKeyIdentifier(e->extnValue.data,
340					e->extnValue.length,
341					&ai, &size);
342    if (ret) {
343	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
344		       "Decoding AuthorityKeyIdentifier failed: %d", ret);
345	return 1;
346    }
347    if (size != e->extnValue.length) {
348	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
349		       "Decoding SKI ahve extra bits on the end");
350	return 1;
351    }
352
353    if (ai.keyIdentifier) {
354	char *id;
355	hex_encode(ai.keyIdentifier->data, ai.keyIdentifier->length, &id);
356	if (id) {
357	    validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
358			   "\tauthority key id: %s\n", id);
359	    free(id);
360	}
361    }
362
363    return 0;
364}
365
366static int
367check_extKeyUsage(hx509_validate_ctx ctx,
368		  struct cert_status *status,
369		  enum critical_flag cf,
370		  const Extension *e)
371{
372    ExtKeyUsage eku;
373    size_t size, i;
374    int ret;
375
376    check_Null(ctx, status, cf, e);
377
378    ret = decode_ExtKeyUsage(e->extnValue.data,
379			     e->extnValue.length,
380			     &eku, &size);
381    if (ret) {
382	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
383		       "Decoding ExtKeyUsage failed: %d", ret);
384	return 1;
385    }
386    if (size != e->extnValue.length) {
387	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
388		       "Padding data in EKU");
389	free_ExtKeyUsage(&eku);
390	return 1;
391    }
392    if (eku.len == 0) {
393	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
394		       "ExtKeyUsage length is 0");
395	return 1;
396    }
397
398    for (i = 0; i < eku.len; i++) {
399	char *str;
400	ret = der_print_heim_oid (&eku.val[i], '.', &str);
401	if (ret) {
402	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
403			   "\tEKU: failed to print oid %d", i);
404	    free_ExtKeyUsage(&eku);
405	    return 1;
406	}
407	validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
408		       "\teku-%d: %s\n", i, str);;
409	free(str);
410    }
411
412    free_ExtKeyUsage(&eku);
413
414    return 0;
415}
416
417static int
418check_pkinit_san(hx509_validate_ctx ctx, heim_any *a)
419{
420    KRB5PrincipalName kn;
421    unsigned i;
422    size_t size;
423    int ret;
424
425    ret = decode_KRB5PrincipalName(a->data, a->length, &kn, &size);
426    if (ret) {
427	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
428		       "Decoding kerberos name in SAN failed: %d", ret);
429	return 1;
430    }
431
432    if (size != a->length) {
433	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
434		       "Decoding kerberos name have extra bits on the end");
435	return 1;
436    }
437
438    /* print kerberos principal, add code to quote / within components */
439    for (i = 0; i < kn.principalName.name_string.len; i++) {
440	validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s",
441		       kn.principalName.name_string.val[i]);
442	if (i + 1 < kn.principalName.name_string.len)
443	    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "/");
444    }
445    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "@");
446    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s", kn.realm);
447
448    free_KRB5PrincipalName(&kn);
449    return 0;
450}
451
452static int
453check_utf8_string_san(hx509_validate_ctx ctx, heim_any *a)
454{
455    PKIXXmppAddr jid;
456    size_t size;
457    int ret;
458
459    ret = decode_PKIXXmppAddr(a->data, a->length, &jid, &size);
460    if (ret) {
461	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
462		       "Decoding JID in SAN failed: %d", ret);
463	return 1;
464    }
465
466    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s", jid);
467    free_PKIXXmppAddr(&jid);
468
469    return 0;
470}
471
472static int
473check_altnull(hx509_validate_ctx ctx, heim_any *a)
474{
475    return 0;
476}
477
478static int
479check_CRLDistributionPoints(hx509_validate_ctx ctx,
480			   struct cert_status *status,
481			   enum critical_flag cf,
482			   const Extension *e)
483{
484    CRLDistributionPoints dp;
485    size_t size;
486    int ret, i;
487
488    check_Null(ctx, status, cf, e);
489
490    ret = decode_CRLDistributionPoints(e->extnValue.data,
491				       e->extnValue.length,
492				       &dp, &size);
493    if (ret) {
494	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
495		       "Decoding CRL Distribution Points failed: %d\n", ret);
496	return 1;
497    }
498
499    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "CRL Distribution Points:\n");
500    for (i = 0 ; i < dp.len; i++) {
501	if (dp.val[i].distributionPoint) {
502	    DistributionPointName dpname;
503	    heim_any *data = dp.val[i].distributionPoint;
504	    int j;
505
506	    ret = decode_DistributionPointName(data->data, data->length,
507					       &dpname, NULL);
508	    if (ret) {
509		validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
510			       "Failed to parse CRL Distribution Point Name: %d\n", ret);
511		continue;
512	    }
513
514	    switch (dpname.element) {
515	    case choice_DistributionPointName_fullName:
516		validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "Fullname:\n");
517
518		for (j = 0 ; j < dpname.u.fullName.len; j++) {
519		    char *s;
520		    GeneralName *name = &dpname.u.fullName.val[j];
521
522		    ret = hx509_general_name_unparse(name, &s);
523		    if (ret == 0 && s != NULL) {
524			validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "   %s\n", s);
525			free(s);
526		    }
527		}
528		break;
529	    case choice_DistributionPointName_nameRelativeToCRLIssuer:
530		validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
531			       "Unknown nameRelativeToCRLIssuer");
532		break;
533	    default:
534		validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
535			       "Unknown DistributionPointName");
536		break;
537	    }
538	    free_DistributionPointName(&dpname);
539	}
540    }
541    free_CRLDistributionPoints(&dp);
542
543    status->haveCRLDP = 1;
544
545    return 0;
546}
547
548
549struct {
550    const char *name;
551    const heim_oid *oid;
552    int (*func)(hx509_validate_ctx, heim_any *);
553} altname_types[] = {
554    { "pk-init", &asn1_oid_id_pkinit_san, check_pkinit_san },
555    { "jabber", &asn1_oid_id_pkix_on_xmppAddr, check_utf8_string_san },
556    { "dns-srv", &asn1_oid_id_pkix_on_dnsSRV, check_altnull },
557    { "card-id", &asn1_oid_id_uspkicommon_card_id, check_altnull },
558    { "Microsoft NT-PRINCIPAL-NAME", &asn1_oid_id_pkinit_ms_san, check_utf8_string_san }
559};
560
561static int
562check_altName(hx509_validate_ctx ctx,
563	      struct cert_status *status,
564	      const char *name,
565	      enum critical_flag cf,
566	      const Extension *e)
567{
568    GeneralNames gn;
569    size_t size;
570    int ret, i;
571
572    check_Null(ctx, status, cf, e);
573
574    if (e->extnValue.length == 0) {
575	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
576		       "%sAltName empty, not allowed", name);
577	return 1;
578    }
579    ret = decode_GeneralNames(e->extnValue.data, e->extnValue.length,
580			      &gn, &size);
581    if (ret) {
582	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
583		       "\tret = %d while decoding %s GeneralNames\n",
584		       ret, name);
585	return 1;
586    }
587    if (gn.len == 0) {
588	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
589		       "%sAltName generalName empty, not allowed\n", name);
590	return 1;
591    }
592
593    for (i = 0; i < gn.len; i++) {
594	switch (gn.val[i].element) {
595	case choice_GeneralName_otherName: {
596	    unsigned j;
597
598	    validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
599			   "%sAltName otherName ", name);
600
601	    for (j = 0; j < sizeof(altname_types)/sizeof(altname_types[0]); j++) {
602		if (der_heim_oid_cmp(altname_types[j].oid,
603				     &gn.val[i].u.otherName.type_id) != 0)
604		    continue;
605
606		validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s: ",
607			       altname_types[j].name);
608		(*altname_types[j].func)(ctx, &gn.val[i].u.otherName.value);
609		break;
610	    }
611	    if (j == sizeof(altname_types)/sizeof(altname_types[0])) {
612		hx509_oid_print(&gn.val[i].u.otherName.type_id,
613				validate_vprint, ctx);
614		validate_print(ctx, HX509_VALIDATE_F_VERBOSE, " unknown");
615	    }
616	    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\n");
617	    break;
618	}
619	default: {
620	    char *s;
621	    ret = hx509_general_name_unparse(&gn.val[i], &s);
622	    if (ret) {
623		validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
624			       "ret = %d unparsing GeneralName\n", ret);
625		return 1;
626	    }
627	    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s\n", s);
628	    free(s);
629	    break;
630	}
631	}
632    }
633
634    free_GeneralNames(&gn);
635
636    return 0;
637}
638
639static int
640check_subjectAltName(hx509_validate_ctx ctx,
641		     struct cert_status *status,
642		     enum critical_flag cf,
643		     const Extension *e)
644{
645    status->haveSAN = 1;
646    return check_altName(ctx, status, "subject", cf, e);
647}
648
649static int
650check_issuerAltName(hx509_validate_ctx ctx,
651		    struct cert_status *status,
652		     enum critical_flag cf,
653		     const Extension *e)
654{
655    status->haveIAN = 1;
656    return check_altName(ctx, status, "issuer", cf, e);
657}
658
659
660static int
661check_basicConstraints(hx509_validate_ctx ctx,
662		       struct cert_status *status,
663		       enum critical_flag cf,
664		       const Extension *e)
665{
666    BasicConstraints b;
667    size_t size;
668    int ret;
669
670    check_Null(ctx, status, cf, e);
671
672    ret = decode_BasicConstraints(e->extnValue.data, e->extnValue.length,
673				  &b, &size);
674    if (ret) {
675	printf("\tret = %d while decoding BasicConstraints\n", ret);
676	return 0;
677    }
678    if (size != e->extnValue.length)
679	printf("\tlength of der data isn't same as extension\n");
680
681    validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
682		   "\tis %sa CA\n", b.cA && *b.cA ? "" : "NOT ");
683    if (b.pathLenConstraint)
684	validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
685		       "\tpathLenConstraint: %d\n", *b.pathLenConstraint);
686
687    if (b.cA) {
688	if (*b.cA) {
689	    if (!e->critical)
690		validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
691			       "Is a CA and not BasicConstraints CRITICAL\n");
692	    status->isca = 1;
693	}
694	else
695	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
696			   "cA is FALSE, not allowed to be\n");
697    }
698    free_BasicConstraints(&b);
699
700    return 0;
701}
702
703static int
704check_proxyCertInfo(hx509_validate_ctx ctx,
705		    struct cert_status *status,
706		    enum critical_flag cf,
707		    const Extension *e)
708{
709    check_Null(ctx, status, cf, e);
710    status->isproxy = 1;
711    return 0;
712}
713
714static int
715check_authorityInfoAccess(hx509_validate_ctx ctx,
716			  struct cert_status *status,
717			  enum critical_flag cf,
718			  const Extension *e)
719{
720    AuthorityInfoAccessSyntax aia;
721    size_t size;
722    int ret, i;
723
724    check_Null(ctx, status, cf, e);
725
726    ret = decode_AuthorityInfoAccessSyntax(e->extnValue.data,
727					   e->extnValue.length,
728					   &aia, &size);
729    if (ret) {
730	printf("\tret = %d while decoding AuthorityInfoAccessSyntax\n", ret);
731	return 0;
732    }
733
734    for (i = 0; i < aia.len; i++) {
735	char *str;
736	validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
737		       "\ttype: ");
738	hx509_oid_print(&aia.val[i].accessMethod, validate_vprint, ctx);
739	hx509_general_name_unparse(&aia.val[i].accessLocation, &str);
740	validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
741		       "\n\tdirname: %s\n", str);
742	free(str);
743    }
744    free_AuthorityInfoAccessSyntax(&aia);
745
746    return 0;
747}
748
749/*
750 *
751 */
752
753struct {
754    const char *name;
755    const heim_oid *oid;
756    int (*func)(hx509_validate_ctx ctx,
757		struct cert_status *status,
758		enum critical_flag cf,
759		const Extension *);
760    enum critical_flag cf;
761} check_extension[] = {
762#define ext(name, checkname) #name, &asn1_oid_id_x509_ce_##name, check_##checkname
763    { ext(subjectDirectoryAttributes, Null), M_N_C },
764    { ext(subjectKeyIdentifier, subjectKeyIdentifier), M_N_C },
765    { ext(keyUsage, Null), S_C },
766    { ext(subjectAltName, subjectAltName), M_N_C },
767    { ext(issuerAltName, issuerAltName), S_N_C },
768    { ext(basicConstraints, basicConstraints), D_C },
769    { ext(cRLNumber, Null), M_N_C },
770    { ext(cRLReason, Null), M_N_C },
771    { ext(holdInstructionCode, Null), M_N_C },
772    { ext(invalidityDate, Null), M_N_C },
773    { ext(deltaCRLIndicator, Null), M_C },
774    { ext(issuingDistributionPoint, Null), M_C },
775    { ext(certificateIssuer, Null), M_C },
776    { ext(nameConstraints, Null), M_C },
777    { ext(cRLDistributionPoints, CRLDistributionPoints), S_N_C },
778    { ext(certificatePolicies, Null) },
779    { ext(policyMappings, Null), M_N_C },
780    { ext(authorityKeyIdentifier, authorityKeyIdentifier), M_N_C },
781    { ext(policyConstraints, Null), D_C },
782    { ext(extKeyUsage, extKeyUsage), D_C },
783    { ext(freshestCRL, Null), M_N_C },
784    { ext(inhibitAnyPolicy, Null), M_C },
785#undef ext
786#define ext(name, checkname) #name, &asn1_oid_id_pkix_pe_##name, check_##checkname
787    { ext(proxyCertInfo, proxyCertInfo), M_C },
788    { ext(authorityInfoAccess, authorityInfoAccess), M_C },
789#undef ext
790    { "US Fed PKI - PIV Interim", &asn1_oid_id_uspkicommon_piv_interim,
791      check_Null, D_C },
792    { "Netscape cert comment", &asn1_oid_id_netscape_cert_comment,
793      check_Null, D_C },
794    { NULL }
795};
796
797/**
798 * Allocate a hx509 validation/printing context.
799 *
800 * @param context A hx509 context.
801 * @param ctx a new allocated hx509 validation context, free with
802 * hx509_validate_ctx_free().
803
804 * @return An hx509 error code, see hx509_get_error_string().
805 *
806 * @ingroup hx509_print
807 */
808
809int
810hx509_validate_ctx_init(hx509_context context, hx509_validate_ctx *ctx)
811{
812    *ctx = malloc(sizeof(**ctx));
813    if (*ctx == NULL)
814	return ENOMEM;
815    memset(*ctx, 0, sizeof(**ctx));
816    return 0;
817}
818
819/**
820 * Set the printing functions for the validation context.
821 *
822 * @param ctx a hx509 valication context.
823 * @param func the printing function to usea.
824 * @param c the context variable to the printing function.
825 *
826 * @return An hx509 error code, see hx509_get_error_string().
827 *
828 * @ingroup hx509_print
829 */
830
831void
832hx509_validate_ctx_set_print(hx509_validate_ctx ctx,
833			     hx509_vprint_func func,
834			     void *c)
835{
836    ctx->vprint_func = func;
837    ctx->ctx = c;
838}
839
840/**
841 * Add flags to control the behaivor of the hx509_validate_cert()
842 * function.
843 *
844 * @param ctx A hx509 validation context.
845 * @param flags flags to add to the validation context.
846 *
847 * @return An hx509 error code, see hx509_get_error_string().
848 *
849 * @ingroup hx509_print
850 */
851
852void
853hx509_validate_ctx_add_flags(hx509_validate_ctx ctx, int flags)
854{
855    ctx->flags |= flags;
856}
857
858/**
859 * Free an hx509 validate context.
860 *
861 * @param ctx the hx509 validate context to free.
862 *
863 * @ingroup hx509_print
864 */
865
866void
867hx509_validate_ctx_free(hx509_validate_ctx ctx)
868{
869    free(ctx);
870}
871
872/**
873 * Validate/Print the status of the certificate.
874 *
875 * @param context A hx509 context.
876 * @param ctx A hx509 validation context.
877 * @param cert the cerificate to validate/print.
878
879 * @return An hx509 error code, see hx509_get_error_string().
880 *
881 * @ingroup hx509_print
882 */
883
884int
885hx509_validate_cert(hx509_context context,
886		    hx509_validate_ctx ctx,
887		    hx509_cert cert)
888{
889    Certificate *c = _hx509_get_cert(cert);
890    TBSCertificate *t = &c->tbsCertificate;
891    hx509_name issuer, subject;
892    char *str;
893    struct cert_status status;
894    int ret;
895
896    memset(&status, 0, sizeof(status));
897
898    if (_hx509_cert_get_version(c) != 3)
899	validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
900		       "Not version 3 certificate\n");
901
902    if ((t->version == NULL || *t->version < 2) && t->extensions)
903	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
904		       "Not version 3 certificate with extensions\n");
905
906    if (_hx509_cert_get_version(c) >= 3 && t->extensions == NULL)
907	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
908		       "Version 3 certificate without extensions\n");
909
910    ret = hx509_cert_get_subject(cert, &subject);
911    if (ret) abort();
912    hx509_name_to_string(subject, &str);
913    validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
914		   "subject name: %s\n", str);
915    free(str);
916
917    ret = hx509_cert_get_issuer(cert, &issuer);
918    if (ret) abort();
919    hx509_name_to_string(issuer, &str);
920    validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
921		   "issuer name: %s\n", str);
922    free(str);
923
924    if (hx509_name_cmp(subject, issuer) == 0) {
925	status.selfsigned = 1;
926	validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
927		       "\tis a self-signed certificate\n");
928    }
929
930    validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
931		   "Validity:\n");
932
933    Time2string(&t->validity.notBefore, &str);
934    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\tnotBefore %s\n", str);
935    free(str);
936    Time2string(&t->validity.notAfter, &str);
937    validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\tnotAfter  %s\n", str);
938    free(str);
939
940    if (t->extensions) {
941	int i, j;
942
943	if (t->extensions->len == 0) {
944	    validate_print(ctx,
945			   HX509_VALIDATE_F_VALIDATE|HX509_VALIDATE_F_VERBOSE,
946			   "The empty extensions list is not "
947			   "allowed by PKIX\n");
948	}
949
950	for (i = 0; i < t->extensions->len; i++) {
951
952	    for (j = 0; check_extension[j].name; j++)
953		if (der_heim_oid_cmp(check_extension[j].oid,
954				     &t->extensions->val[i].extnID) == 0)
955		    break;
956	    if (check_extension[j].name == NULL) {
957		int flags = HX509_VALIDATE_F_VERBOSE;
958		if (t->extensions->val[i].critical)
959		    flags |= HX509_VALIDATE_F_VALIDATE;
960		validate_print(ctx, flags, "don't know what ");
961		if (t->extensions->val[i].critical)
962		    validate_print(ctx, flags, "and is CRITICAL ");
963		if (ctx->flags & flags)
964		    hx509_oid_print(&t->extensions->val[i].extnID,
965				    validate_vprint, ctx);
966		validate_print(ctx, flags, " is\n");
967		continue;
968	    }
969	    validate_print(ctx,
970			   HX509_VALIDATE_F_VALIDATE|HX509_VALIDATE_F_VERBOSE,
971			   "checking extention: %s\n",
972			   check_extension[j].name);
973	    (*check_extension[j].func)(ctx,
974				       &status,
975				       check_extension[j].cf,
976				       &t->extensions->val[i]);
977	}
978    } else
979	validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "no extentions\n");
980
981    if (status.isca) {
982	if (!status.haveSKI)
983	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
984			   "CA certificate have no SubjectKeyIdentifier\n");
985
986    } else {
987	if (!status.haveAKI)
988	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
989			   "Is not CA and doesn't have "
990			   "AuthorityKeyIdentifier\n");
991    }
992
993
994    if (!status.haveSKI)
995	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
996		       "Doesn't have SubjectKeyIdentifier\n");
997
998    if (status.isproxy && status.isca)
999	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1000		       "Proxy and CA at the same time!\n");
1001
1002    if (status.isproxy) {
1003	if (status.haveSAN)
1004	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1005			   "Proxy and have SAN\n");
1006	if (status.haveIAN)
1007	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1008			   "Proxy and have IAN\n");
1009    }
1010
1011    if (hx509_name_is_null_p(subject) && !status.haveSAN)
1012	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1013		       "NULL subject DN and doesn't have a SAN\n");
1014
1015    if (!status.selfsigned && !status.haveCRLDP)
1016	validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1017		       "Not a CA nor PROXY and doesn't have"
1018		       "CRL Dist Point\n");
1019
1020    if (status.selfsigned) {
1021	ret = _hx509_verify_signature_bitstring(context,
1022						cert,
1023						&c->signatureAlgorithm,
1024						&c->tbsCertificate._save,
1025						&c->signatureValue);
1026	if (ret == 0)
1027	    validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
1028			   "Self-signed certificate was self-signed\n");
1029	else
1030	    validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1031			   "Self-signed certificate NOT really self-signed!\n");
1032    }
1033
1034    hx509_name_free(&subject);
1035    hx509_name_free(&issuer);
1036
1037    return 0;
1038}
1039