1 /*
2 * Copyright 2006-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * Implementation of RFC 3779 section 3.2.
12 */
13
14 #include <assert.h>
15 #include <stdio.h>
16 #include <string.h>
17 #include "internal/cryptlib.h"
18 #include <openssl/conf.h>
19 #include <openssl/asn1.h>
20 #include <openssl/asn1t.h>
21 #include <openssl/x509v3.h>
22 #include <openssl/x509.h>
23 #include "crypto/x509.h"
24 #include <openssl/bn.h>
25 #include "ext_dat.h"
26 #include "x509_local.h"
27
28 #ifndef OPENSSL_NO_RFC3779
29
30 /*
31 * OpenSSL ASN.1 template translation of RFC 3779 3.2.3.
32 */
33
34 ASN1_SEQUENCE(ASRange) = {
35 ASN1_SIMPLE(ASRange, min, ASN1_INTEGER),
36 ASN1_SIMPLE(ASRange, max, ASN1_INTEGER)
37 } ASN1_SEQUENCE_END(ASRange)
38
39 ASN1_CHOICE(ASIdOrRange) = {
40 ASN1_SIMPLE(ASIdOrRange, u.id, ASN1_INTEGER),
41 ASN1_SIMPLE(ASIdOrRange, u.range, ASRange)
42 } ASN1_CHOICE_END(ASIdOrRange)
43
44 ASN1_CHOICE(ASIdentifierChoice) = {
45 ASN1_SIMPLE(ASIdentifierChoice, u.inherit, ASN1_NULL),
46 ASN1_SEQUENCE_OF(ASIdentifierChoice, u.asIdsOrRanges, ASIdOrRange)
47 } ASN1_CHOICE_END(ASIdentifierChoice)
48
49 ASN1_SEQUENCE(ASIdentifiers) = {
50 ASN1_EXP_OPT(ASIdentifiers, asnum, ASIdentifierChoice, 0),
51 ASN1_EXP_OPT(ASIdentifiers, rdi, ASIdentifierChoice, 1)
52 } ASN1_SEQUENCE_END(ASIdentifiers)
53
54 IMPLEMENT_ASN1_FUNCTIONS(ASRange)
55 IMPLEMENT_ASN1_FUNCTIONS(ASIdOrRange)
56 IMPLEMENT_ASN1_FUNCTIONS(ASIdentifierChoice)
57 IMPLEMENT_ASN1_FUNCTIONS(ASIdentifiers)
58
59 /*
60 * i2r method for an ASIdentifierChoice.
61 */
62 static int i2r_ASIdentifierChoice(BIO *out,
63 ASIdentifierChoice *choice,
64 int indent, const char *msg)
65 {
66 int i;
67 char *s;
68 if (choice == NULL)
69 return 1;
70 BIO_printf(out, "%*s%s:\n", indent, "", msg);
71 switch (choice->type) {
72 case ASIdentifierChoice_inherit:
73 BIO_printf(out, "%*sinherit\n", indent + 2, "");
74 break;
75 case ASIdentifierChoice_asIdsOrRanges:
76 for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges); i++) {
77 ASIdOrRange *aor =
78 sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
79 switch (aor->type) {
80 case ASIdOrRange_id:
81 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.id)) == NULL)
82 return 0;
83 BIO_printf(out, "%*s%s\n", indent + 2, "", s);
84 OPENSSL_free(s);
85 break;
86 case ASIdOrRange_range:
87 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->min)) == NULL)
88 return 0;
89 BIO_printf(out, "%*s%s-", indent + 2, "", s);
90 OPENSSL_free(s);
91 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->max)) == NULL)
92 return 0;
93 BIO_printf(out, "%s\n", s);
94 OPENSSL_free(s);
95 break;
96 default:
97 return 0;
98 }
99 }
100 break;
101 default:
102 return 0;
103 }
104 return 1;
105 }
106
107 /*
108 * i2r method for an ASIdentifier extension.
109 */
i2r_ASIdentifiers(const X509V3_EXT_METHOD * method,void * ext,BIO * out,int indent)110 static int i2r_ASIdentifiers(const X509V3_EXT_METHOD *method,
111 void *ext, BIO *out, int indent)
112 {
113 ASIdentifiers *asid = ext;
114 return (i2r_ASIdentifierChoice(out, asid->asnum, indent,
115 "Autonomous System Numbers") &&
116 i2r_ASIdentifierChoice(out, asid->rdi, indent,
117 "Routing Domain Identifiers"));
118 }
119
120 /*
121 * Sort comparison function for a sequence of ASIdOrRange elements.
122 */
ASIdOrRange_cmp(const ASIdOrRange * const * a_,const ASIdOrRange * const * b_)123 static int ASIdOrRange_cmp(const ASIdOrRange *const *a_,
124 const ASIdOrRange *const *b_)
125 {
126 const ASIdOrRange *a = *a_, *b = *b_;
127
128 assert((a->type == ASIdOrRange_id && a->u.id != NULL) ||
129 (a->type == ASIdOrRange_range && a->u.range != NULL &&
130 a->u.range->min != NULL && a->u.range->max != NULL));
131
132 assert((b->type == ASIdOrRange_id && b->u.id != NULL) ||
133 (b->type == ASIdOrRange_range && b->u.range != NULL &&
134 b->u.range->min != NULL && b->u.range->max != NULL));
135
136 if (a->type == ASIdOrRange_id && b->type == ASIdOrRange_id)
137 return ASN1_INTEGER_cmp(a->u.id, b->u.id);
138
139 if (a->type == ASIdOrRange_range && b->type == ASIdOrRange_range) {
140 int r = ASN1_INTEGER_cmp(a->u.range->min, b->u.range->min);
141 return r != 0 ? r : ASN1_INTEGER_cmp(a->u.range->max,
142 b->u.range->max);
143 }
144
145 if (a->type == ASIdOrRange_id)
146 return ASN1_INTEGER_cmp(a->u.id, b->u.range->min);
147 else
148 return ASN1_INTEGER_cmp(a->u.range->min, b->u.id);
149 }
150
151 /*
152 * Add an inherit element.
153 */
X509v3_asid_add_inherit(ASIdentifiers * asid,int which)154 int X509v3_asid_add_inherit(ASIdentifiers *asid, int which)
155 {
156 ASIdentifierChoice **choice;
157 if (asid == NULL)
158 return 0;
159 switch (which) {
160 case V3_ASID_ASNUM:
161 choice = &asid->asnum;
162 break;
163 case V3_ASID_RDI:
164 choice = &asid->rdi;
165 break;
166 default:
167 return 0;
168 }
169 if (*choice == NULL) {
170 if ((*choice = ASIdentifierChoice_new()) == NULL)
171 return 0;
172 if (((*choice)->u.inherit = ASN1_NULL_new()) == NULL) {
173 ASIdentifierChoice_free(*choice);
174 *choice = NULL;
175 return 0;
176 }
177 (*choice)->type = ASIdentifierChoice_inherit;
178 }
179 return (*choice)->type == ASIdentifierChoice_inherit;
180 }
181
182 /*
183 * Add an ID or range to an ASIdentifierChoice.
184 */
X509v3_asid_add_id_or_range(ASIdentifiers * asid,int which,ASN1_INTEGER * min,ASN1_INTEGER * max)185 int X509v3_asid_add_id_or_range(ASIdentifiers *asid,
186 int which, ASN1_INTEGER *min, ASN1_INTEGER *max)
187 {
188 ASIdentifierChoice **choice;
189 ASIdOrRange *aor;
190 if (asid == NULL)
191 return 0;
192 switch (which) {
193 case V3_ASID_ASNUM:
194 choice = &asid->asnum;
195 break;
196 case V3_ASID_RDI:
197 choice = &asid->rdi;
198 break;
199 default:
200 return 0;
201 }
202 if (*choice != NULL && (*choice)->type != ASIdentifierChoice_asIdsOrRanges)
203 return 0;
204 if (*choice == NULL) {
205 if ((*choice = ASIdentifierChoice_new()) == NULL)
206 return 0;
207 (*choice)->u.asIdsOrRanges = sk_ASIdOrRange_new(ASIdOrRange_cmp);
208 if ((*choice)->u.asIdsOrRanges == NULL) {
209 ASIdentifierChoice_free(*choice);
210 *choice = NULL;
211 return 0;
212 }
213 (*choice)->type = ASIdentifierChoice_asIdsOrRanges;
214 }
215 if ((aor = ASIdOrRange_new()) == NULL)
216 return 0;
217 if (!sk_ASIdOrRange_reserve((*choice)->u.asIdsOrRanges, 1))
218 goto err;
219 if (max == NULL) {
220 aor->type = ASIdOrRange_id;
221 aor->u.id = min;
222 } else {
223 aor->type = ASIdOrRange_range;
224 if ((aor->u.range = ASRange_new()) == NULL)
225 goto err;
226 ASN1_INTEGER_free(aor->u.range->min);
227 aor->u.range->min = min;
228 ASN1_INTEGER_free(aor->u.range->max);
229 aor->u.range->max = max;
230 }
231 /* Cannot fail due to the reservation above */
232 if (!ossl_assert(sk_ASIdOrRange_push((*choice)->u.asIdsOrRanges, aor)))
233 goto err;
234 return 1;
235
236 err:
237 ASIdOrRange_free(aor);
238 return 0;
239 }
240
241 /*
242 * Extract min and max values from an ASIdOrRange.
243 */
extract_min_max(ASIdOrRange * aor,ASN1_INTEGER ** min,ASN1_INTEGER ** max)244 static int extract_min_max(ASIdOrRange *aor,
245 ASN1_INTEGER **min, ASN1_INTEGER **max)
246 {
247 if (!ossl_assert(aor != NULL))
248 return 0;
249 switch (aor->type) {
250 case ASIdOrRange_id:
251 *min = aor->u.id;
252 *max = aor->u.id;
253 return 1;
254 case ASIdOrRange_range:
255 *min = aor->u.range->min;
256 *max = aor->u.range->max;
257 return 1;
258 }
259
260 return 0;
261 }
262
263 /*
264 * Check whether an ASIdentifierChoice is in canonical form.
265 */
ASIdentifierChoice_is_canonical(ASIdentifierChoice * choice)266 static int ASIdentifierChoice_is_canonical(ASIdentifierChoice *choice)
267 {
268 ASN1_INTEGER *a_max_plus_one = NULL;
269 ASN1_INTEGER *orig;
270 BIGNUM *bn = NULL;
271 int i, ret = 0;
272
273 /*
274 * Empty element or inheritance is canonical.
275 */
276 if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
277 return 1;
278
279 /*
280 * If not a list, or if empty list, it's broken.
281 */
282 if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
283 sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0)
284 return 0;
285
286 /*
287 * It's a list, check it.
288 */
289 for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
290 ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
291 ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
292 ASN1_INTEGER *a_min = NULL, *a_max = NULL, *b_min = NULL, *b_max =
293 NULL;
294
295 if (!extract_min_max(a, &a_min, &a_max)
296 || !extract_min_max(b, &b_min, &b_max))
297 goto done;
298
299 /*
300 * Punt misordered list, overlapping start, or inverted range.
301 */
302 if (ASN1_INTEGER_cmp(a_min, b_min) >= 0 ||
303 ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
304 ASN1_INTEGER_cmp(b_min, b_max) > 0)
305 goto done;
306
307 /*
308 * Calculate a_max + 1 to check for adjacency.
309 */
310 if ((bn == NULL && (bn = BN_new()) == NULL) ||
311 ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
312 !BN_add_word(bn, 1)) {
313 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
314 goto done;
315 }
316
317 if ((a_max_plus_one =
318 BN_to_ASN1_INTEGER(bn, orig = a_max_plus_one)) == NULL) {
319 a_max_plus_one = orig;
320 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
321 goto done;
322 }
323
324 /*
325 * Punt if adjacent or overlapping.
326 */
327 if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) >= 0)
328 goto done;
329 }
330
331 /*
332 * Check for inverted range.
333 */
334 i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
335 {
336 ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
337 ASN1_INTEGER *a_min, *a_max;
338 if (a != NULL && a->type == ASIdOrRange_range) {
339 if (!extract_min_max(a, &a_min, &a_max)
340 || ASN1_INTEGER_cmp(a_min, a_max) > 0)
341 goto done;
342 }
343 }
344
345 ret = 1;
346
347 done:
348 ASN1_INTEGER_free(a_max_plus_one);
349 BN_free(bn);
350 return ret;
351 }
352
353 /*
354 * Check whether an ASIdentifier extension is in canonical form.
355 */
X509v3_asid_is_canonical(ASIdentifiers * asid)356 int X509v3_asid_is_canonical(ASIdentifiers *asid)
357 {
358 return (asid == NULL ||
359 (ASIdentifierChoice_is_canonical(asid->asnum) &&
360 ASIdentifierChoice_is_canonical(asid->rdi)));
361 }
362
363 /*
364 * Whack an ASIdentifierChoice into canonical form.
365 */
ASIdentifierChoice_canonize(ASIdentifierChoice * choice)366 static int ASIdentifierChoice_canonize(ASIdentifierChoice *choice)
367 {
368 ASN1_INTEGER *a_max_plus_one = NULL;
369 ASN1_INTEGER *orig;
370 BIGNUM *bn = NULL;
371 int i, ret = 0;
372
373 /*
374 * Nothing to do for empty element or inheritance.
375 */
376 if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
377 return 1;
378
379 /*
380 * If not a list, or if empty list, it's broken.
381 */
382 if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
383 sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0) {
384 ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
385 return 0;
386 }
387
388 /*
389 * We have a non-empty list. Sort it.
390 */
391 sk_ASIdOrRange_sort(choice->u.asIdsOrRanges);
392
393 /*
394 * Now check for errors and suboptimal encoding, rejecting the
395 * former and fixing the latter.
396 */
397 for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
398 ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
399 ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
400 ASN1_INTEGER *a_min = NULL, *a_max = NULL, *b_min = NULL, *b_max =
401 NULL;
402
403 if (!extract_min_max(a, &a_min, &a_max)
404 || !extract_min_max(b, &b_min, &b_max))
405 goto done;
406
407 /*
408 * Make sure we're properly sorted (paranoia).
409 */
410 if (!ossl_assert(ASN1_INTEGER_cmp(a_min, b_min) <= 0))
411 goto done;
412
413 /*
414 * Punt inverted ranges.
415 */
416 if (ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
417 ASN1_INTEGER_cmp(b_min, b_max) > 0)
418 goto done;
419
420 /*
421 * Check for overlaps.
422 */
423 if (ASN1_INTEGER_cmp(a_max, b_min) >= 0) {
424 ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
425 goto done;
426 }
427
428 /*
429 * Calculate a_max + 1 to check for adjacency.
430 */
431 if ((bn == NULL && (bn = BN_new()) == NULL) ||
432 ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
433 !BN_add_word(bn, 1)) {
434 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
435 goto done;
436 }
437
438 if ((a_max_plus_one =
439 BN_to_ASN1_INTEGER(bn, orig = a_max_plus_one)) == NULL) {
440 a_max_plus_one = orig;
441 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
442 goto done;
443 }
444
445 /*
446 * If a and b are adjacent, merge them.
447 */
448 if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) == 0) {
449 ASRange *r;
450 switch (a->type) {
451 case ASIdOrRange_id:
452 if ((r = OPENSSL_malloc(sizeof(*r))) == NULL) {
453 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
454 goto done;
455 }
456 r->min = a_min;
457 r->max = b_max;
458 a->type = ASIdOrRange_range;
459 a->u.range = r;
460 break;
461 case ASIdOrRange_range:
462 ASN1_INTEGER_free(a->u.range->max);
463 a->u.range->max = b_max;
464 break;
465 }
466 switch (b->type) {
467 case ASIdOrRange_id:
468 b->u.id = NULL;
469 break;
470 case ASIdOrRange_range:
471 b->u.range->max = NULL;
472 break;
473 }
474 ASIdOrRange_free(b);
475 (void)sk_ASIdOrRange_delete(choice->u.asIdsOrRanges, i + 1);
476 i--;
477 continue;
478 }
479 }
480
481 /*
482 * Check for final inverted range.
483 */
484 i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
485 {
486 ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
487 ASN1_INTEGER *a_min, *a_max;
488 if (a != NULL && a->type == ASIdOrRange_range) {
489 if (!extract_min_max(a, &a_min, &a_max)
490 || ASN1_INTEGER_cmp(a_min, a_max) > 0)
491 goto done;
492 }
493 }
494
495 /* Paranoia */
496 if (!ossl_assert(ASIdentifierChoice_is_canonical(choice)))
497 goto done;
498
499 ret = 1;
500
501 done:
502 ASN1_INTEGER_free(a_max_plus_one);
503 BN_free(bn);
504 return ret;
505 }
506
507 /*
508 * Whack an ASIdentifier extension into canonical form.
509 */
X509v3_asid_canonize(ASIdentifiers * asid)510 int X509v3_asid_canonize(ASIdentifiers *asid)
511 {
512 return (asid == NULL ||
513 (ASIdentifierChoice_canonize(asid->asnum) &&
514 ASIdentifierChoice_canonize(asid->rdi)));
515 }
516
517 /*
518 * v2i method for an ASIdentifier extension.
519 */
v2i_ASIdentifiers(const struct v3_ext_method * method,struct v3_ext_ctx * ctx,STACK_OF (CONF_VALUE)* values)520 static void *v2i_ASIdentifiers(const struct v3_ext_method *method,
521 struct v3_ext_ctx *ctx,
522 STACK_OF(CONF_VALUE) *values)
523 {
524 ASN1_INTEGER *min = NULL, *max = NULL;
525 ASIdentifiers *asid = NULL;
526 int i;
527
528 if ((asid = ASIdentifiers_new()) == NULL) {
529 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
530 return NULL;
531 }
532
533 for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
534 CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
535 int i1 = 0, i2 = 0, i3 = 0, is_range = 0, which = 0;
536
537 /*
538 * Figure out whether this is an AS or an RDI.
539 */
540 if (!ossl_v3_name_cmp(val->name, "AS")) {
541 which = V3_ASID_ASNUM;
542 } else if (!ossl_v3_name_cmp(val->name, "RDI")) {
543 which = V3_ASID_RDI;
544 } else {
545 ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_NAME_ERROR);
546 X509V3_conf_add_error_name_value(val);
547 goto err;
548 }
549
550 if (val->value == NULL) {
551 ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
552 goto err;
553 }
554
555 /*
556 * Handle inheritance.
557 */
558 if (strcmp(val->value, "inherit") == 0) {
559 if (X509v3_asid_add_inherit(asid, which))
560 continue;
561 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_INHERITANCE);
562 X509V3_conf_add_error_name_value(val);
563 goto err;
564 }
565
566 /*
567 * Number, range, or mistake, pick it apart and figure out which.
568 */
569 i1 = strspn(val->value, "0123456789");
570 if (val->value[i1] == '\0') {
571 is_range = 0;
572 } else {
573 is_range = 1;
574 i2 = i1 + strspn(val->value + i1, " \t");
575 if (val->value[i2] != '-') {
576 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_ASNUMBER);
577 X509V3_conf_add_error_name_value(val);
578 goto err;
579 }
580 i2++;
581 i2 = i2 + strspn(val->value + i2, " \t");
582 i3 = i2 + strspn(val->value + i2, "0123456789");
583 if (val->value[i3] != '\0') {
584 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_ASRANGE);
585 X509V3_conf_add_error_name_value(val);
586 goto err;
587 }
588 }
589
590 /*
591 * Syntax is ok, read and add it.
592 */
593 if (!is_range) {
594 if (!X509V3_get_value_int(val, &min)) {
595 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
596 goto err;
597 }
598 } else {
599 char *s = OPENSSL_strdup(val->value);
600 if (s == NULL) {
601 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
602 goto err;
603 }
604 s[i1] = '\0';
605 min = s2i_ASN1_INTEGER(NULL, s);
606 max = s2i_ASN1_INTEGER(NULL, s + i2);
607 OPENSSL_free(s);
608 if (min == NULL || max == NULL) {
609 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
610 goto err;
611 }
612 if (ASN1_INTEGER_cmp(min, max) > 0) {
613 ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
614 goto err;
615 }
616 }
617 if (!X509v3_asid_add_id_or_range(asid, which, min, max)) {
618 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
619 goto err;
620 }
621 min = max = NULL;
622 }
623
624 /*
625 * Canonize the result, then we're done.
626 */
627 if (!X509v3_asid_canonize(asid))
628 goto err;
629 return asid;
630
631 err:
632 ASIdentifiers_free(asid);
633 ASN1_INTEGER_free(min);
634 ASN1_INTEGER_free(max);
635 return NULL;
636 }
637
638 /*
639 * OpenSSL dispatch.
640 */
641 const X509V3_EXT_METHOD ossl_v3_asid = {
642 NID_sbgp_autonomousSysNum, /* nid */
643 0, /* flags */
644 ASN1_ITEM_ref(ASIdentifiers), /* template */
645 0, 0, 0, 0, /* old functions, ignored */
646 0, /* i2s */
647 0, /* s2i */
648 0, /* i2v */
649 v2i_ASIdentifiers, /* v2i */
650 i2r_ASIdentifiers, /* i2r */
651 0, /* r2i */
652 NULL /* extension-specific data */
653 };
654
655 /*
656 * Figure out whether extension uses inheritance.
657 */
X509v3_asid_inherits(ASIdentifiers * asid)658 int X509v3_asid_inherits(ASIdentifiers *asid)
659 {
660 return (asid != NULL &&
661 ((asid->asnum != NULL &&
662 asid->asnum->type == ASIdentifierChoice_inherit) ||
663 (asid->rdi != NULL &&
664 asid->rdi->type == ASIdentifierChoice_inherit)));
665 }
666
667 /*
668 * Figure out whether parent contains child.
669 */
asid_contains(ASIdOrRanges * parent,ASIdOrRanges * child)670 static int asid_contains(ASIdOrRanges *parent, ASIdOrRanges *child)
671 {
672 ASN1_INTEGER *p_min = NULL, *p_max = NULL, *c_min = NULL, *c_max = NULL;
673 int p, c;
674
675 if (child == NULL || parent == child)
676 return 1;
677 if (parent == NULL)
678 return 0;
679
680 p = 0;
681 for (c = 0; c < sk_ASIdOrRange_num(child); c++) {
682 if (!extract_min_max(sk_ASIdOrRange_value(child, c), &c_min, &c_max))
683 return 0;
684 for (;; p++) {
685 if (p >= sk_ASIdOrRange_num(parent))
686 return 0;
687 if (!extract_min_max(sk_ASIdOrRange_value(parent, p), &p_min,
688 &p_max))
689 return 0;
690 if (ASN1_INTEGER_cmp(p_max, c_max) < 0)
691 continue;
692 if (ASN1_INTEGER_cmp(p_min, c_min) > 0)
693 return 0;
694 break;
695 }
696 }
697
698 return 1;
699 }
700
701 /*
702 * Test whether a is a subset of b.
703 */
X509v3_asid_subset(ASIdentifiers * a,ASIdentifiers * b)704 int X509v3_asid_subset(ASIdentifiers *a, ASIdentifiers *b)
705 {
706 int subset;
707
708 if (a == NULL || a == b)
709 return 1;
710
711 if (b == NULL)
712 return 0;
713
714 if (X509v3_asid_inherits(a) || X509v3_asid_inherits(b))
715 return 0;
716
717 subset = a->asnum == NULL
718 || (b->asnum != NULL
719 && asid_contains(b->asnum->u.asIdsOrRanges,
720 a->asnum->u.asIdsOrRanges));
721 if (!subset)
722 return 0;
723
724 return a->rdi == NULL
725 || (b->rdi != NULL
726 && asid_contains(b->rdi->u.asIdsOrRanges,
727 a->rdi->u.asIdsOrRanges));
728 }
729
730 /*
731 * Validation error handling via callback.
732 */
733 #define validation_err(_err_) \
734 do { \
735 if (ctx != NULL) { \
736 ctx->error = _err_; \
737 ctx->error_depth = i; \
738 ctx->current_cert = x; \
739 ret = ctx->verify_cb(0, ctx); \
740 } else { \
741 ret = 0; \
742 } \
743 if (!ret) \
744 goto done; \
745 } while (0)
746
747 /*
748 * Core code for RFC 3779 3.3 path validation.
749 */
asid_validate_path_internal(X509_STORE_CTX * ctx,STACK_OF (X509)* chain,ASIdentifiers * ext)750 static int asid_validate_path_internal(X509_STORE_CTX *ctx,
751 STACK_OF(X509) *chain,
752 ASIdentifiers *ext)
753 {
754 ASIdOrRanges *child_as = NULL, *child_rdi = NULL;
755 int i, ret = 1, inherit_as = 0, inherit_rdi = 0;
756 X509 *x;
757
758 if (!ossl_assert(chain != NULL && sk_X509_num(chain) > 0)
759 || !ossl_assert(ctx != NULL || ext != NULL)
760 || !ossl_assert(ctx == NULL || ctx->verify_cb != NULL)) {
761 if (ctx != NULL)
762 ctx->error = X509_V_ERR_UNSPECIFIED;
763 return 0;
764 }
765
766
767 /*
768 * Figure out where to start. If we don't have an extension to
769 * check, we're done. Otherwise, check canonical form and
770 * set up for walking up the chain.
771 */
772 if (ext != NULL) {
773 i = -1;
774 x = NULL;
775 } else {
776 i = 0;
777 x = sk_X509_value(chain, i);
778 if ((ext = x->rfc3779_asid) == NULL)
779 goto done;
780 }
781 if (!X509v3_asid_is_canonical(ext))
782 validation_err(X509_V_ERR_INVALID_EXTENSION);
783 if (ext->asnum != NULL) {
784 switch (ext->asnum->type) {
785 case ASIdentifierChoice_inherit:
786 inherit_as = 1;
787 break;
788 case ASIdentifierChoice_asIdsOrRanges:
789 child_as = ext->asnum->u.asIdsOrRanges;
790 break;
791 }
792 }
793 if (ext->rdi != NULL) {
794 switch (ext->rdi->type) {
795 case ASIdentifierChoice_inherit:
796 inherit_rdi = 1;
797 break;
798 case ASIdentifierChoice_asIdsOrRanges:
799 child_rdi = ext->rdi->u.asIdsOrRanges;
800 break;
801 }
802 }
803
804 /*
805 * Now walk up the chain. Extensions must be in canonical form, no
806 * cert may list resources that its parent doesn't list.
807 */
808 for (i++; i < sk_X509_num(chain); i++) {
809 x = sk_X509_value(chain, i);
810 if (!ossl_assert(x != NULL)) {
811 if (ctx != NULL)
812 ctx->error = X509_V_ERR_UNSPECIFIED;
813 return 0;
814 }
815 if (x->rfc3779_asid == NULL) {
816 if (child_as != NULL || child_rdi != NULL)
817 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
818 continue;
819 }
820 if (!X509v3_asid_is_canonical(x->rfc3779_asid))
821 validation_err(X509_V_ERR_INVALID_EXTENSION);
822 if (x->rfc3779_asid->asnum == NULL && child_as != NULL) {
823 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
824 child_as = NULL;
825 inherit_as = 0;
826 }
827 if (x->rfc3779_asid->asnum != NULL &&
828 x->rfc3779_asid->asnum->type ==
829 ASIdentifierChoice_asIdsOrRanges) {
830 if (inherit_as
831 || asid_contains(x->rfc3779_asid->asnum->u.asIdsOrRanges,
832 child_as)) {
833 child_as = x->rfc3779_asid->asnum->u.asIdsOrRanges;
834 inherit_as = 0;
835 } else {
836 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
837 }
838 }
839 if (x->rfc3779_asid->rdi == NULL && child_rdi != NULL) {
840 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
841 child_rdi = NULL;
842 inherit_rdi = 0;
843 }
844 if (x->rfc3779_asid->rdi != NULL &&
845 x->rfc3779_asid->rdi->type == ASIdentifierChoice_asIdsOrRanges) {
846 if (inherit_rdi ||
847 asid_contains(x->rfc3779_asid->rdi->u.asIdsOrRanges,
848 child_rdi)) {
849 child_rdi = x->rfc3779_asid->rdi->u.asIdsOrRanges;
850 inherit_rdi = 0;
851 } else {
852 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
853 }
854 }
855 }
856
857 /*
858 * Trust anchor can't inherit.
859 */
860 if (!ossl_assert(x != NULL)) {
861 if (ctx != NULL)
862 ctx->error = X509_V_ERR_UNSPECIFIED;
863 return 0;
864 }
865 if (x->rfc3779_asid != NULL) {
866 if (x->rfc3779_asid->asnum != NULL &&
867 x->rfc3779_asid->asnum->type == ASIdentifierChoice_inherit)
868 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
869 if (x->rfc3779_asid->rdi != NULL &&
870 x->rfc3779_asid->rdi->type == ASIdentifierChoice_inherit)
871 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
872 }
873
874 done:
875 return ret;
876 }
877
878 #undef validation_err
879
880 /*
881 * RFC 3779 3.3 path validation -- called from X509_verify_cert().
882 */
X509v3_asid_validate_path(X509_STORE_CTX * ctx)883 int X509v3_asid_validate_path(X509_STORE_CTX *ctx)
884 {
885 if (ctx->chain == NULL
886 || sk_X509_num(ctx->chain) == 0
887 || ctx->verify_cb == NULL) {
888 ctx->error = X509_V_ERR_UNSPECIFIED;
889 return 0;
890 }
891 return asid_validate_path_internal(ctx, ctx->chain, NULL);
892 }
893
894 /*
895 * RFC 3779 3.3 path validation of an extension.
896 * Test whether chain covers extension.
897 */
X509v3_asid_validate_resource_set(STACK_OF (X509)* chain,ASIdentifiers * ext,int allow_inheritance)898 int X509v3_asid_validate_resource_set(STACK_OF(X509) *chain,
899 ASIdentifiers *ext, int allow_inheritance)
900 {
901 if (ext == NULL)
902 return 1;
903 if (chain == NULL || sk_X509_num(chain) == 0)
904 return 0;
905 if (!allow_inheritance && X509v3_asid_inherits(ext))
906 return 0;
907 return asid_validate_path_internal(NULL, chain, ext);
908 }
909
910 #endif /* OPENSSL_NO_RFC3779 */
911