2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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
11 * Implementation of RFC 3779 section 2.2.
17 #include "internal/cryptlib.h"
18 #include <openssl/conf.h>
19 #include <openssl/asn1.h>
20 #include <openssl/asn1t.h>
21 #include <openssl/buffer.h>
22 #include <openssl/x509v3.h>
23 #include "crypto/x509.h"
26 #ifndef OPENSSL_NO_RFC3779
28 DEFINE_STACK_OF(IPAddressOrRange)
29 DEFINE_STACK_OF(IPAddressFamily)
30 DEFINE_STACK_OF(CONF_VALUE)
34 * OpenSSL ASN.1 template translation of RFC 3779 2.2.3.
37 ASN1_SEQUENCE(IPAddressRange) = {
38 ASN1_SIMPLE(IPAddressRange, min, ASN1_BIT_STRING),
39 ASN1_SIMPLE(IPAddressRange, max, ASN1_BIT_STRING)
40 } ASN1_SEQUENCE_END(IPAddressRange)
42 ASN1_CHOICE(IPAddressOrRange) = {
43 ASN1_SIMPLE(IPAddressOrRange, u.addressPrefix, ASN1_BIT_STRING),
44 ASN1_SIMPLE(IPAddressOrRange, u.addressRange, IPAddressRange)
45 } ASN1_CHOICE_END(IPAddressOrRange)
47 ASN1_CHOICE(IPAddressChoice) = {
48 ASN1_SIMPLE(IPAddressChoice, u.inherit, ASN1_NULL),
49 ASN1_SEQUENCE_OF(IPAddressChoice, u.addressesOrRanges, IPAddressOrRange)
50 } ASN1_CHOICE_END(IPAddressChoice)
52 ASN1_SEQUENCE(IPAddressFamily) = {
53 ASN1_SIMPLE(IPAddressFamily, addressFamily, ASN1_OCTET_STRING),
54 ASN1_SIMPLE(IPAddressFamily, ipAddressChoice, IPAddressChoice)
55 } ASN1_SEQUENCE_END(IPAddressFamily)
57 ASN1_ITEM_TEMPLATE(IPAddrBlocks) =
58 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0,
59 IPAddrBlocks, IPAddressFamily)
60 static_ASN1_ITEM_TEMPLATE_END(IPAddrBlocks)
62 IMPLEMENT_ASN1_FUNCTIONS(IPAddressRange)
63 IMPLEMENT_ASN1_FUNCTIONS(IPAddressOrRange)
64 IMPLEMENT_ASN1_FUNCTIONS(IPAddressChoice)
65 IMPLEMENT_ASN1_FUNCTIONS(IPAddressFamily)
68 * How much buffer space do we need for a raw address?
70 #define ADDR_RAW_BUF_LEN 16
73 * What's the address length associated with this AFI?
75 static int length_from_afi(const unsigned afi)
88 * Extract the AFI from an IPAddressFamily.
90 unsigned int X509v3_addr_get_afi(const IPAddressFamily *f)
93 || f->addressFamily == NULL
94 || f->addressFamily->data == NULL
95 || f->addressFamily->length < 2)
97 return (f->addressFamily->data[0] << 8) | f->addressFamily->data[1];
101 * Expand the bitstring form of an address into a raw byte array.
102 * At the moment this is coded for simplicity, not speed.
104 static int addr_expand(unsigned char *addr,
105 const ASN1_BIT_STRING *bs,
106 const int length, const unsigned char fill)
108 if (bs->length < 0 || bs->length > length)
110 if (bs->length > 0) {
111 memcpy(addr, bs->data, bs->length);
112 if ((bs->flags & 7) != 0) {
113 unsigned char mask = 0xFF >> (8 - (bs->flags & 7));
115 addr[bs->length - 1] &= ~mask;
117 addr[bs->length - 1] |= mask;
120 memset(addr + bs->length, fill, length - bs->length);
125 * Extract the prefix length from a bitstring.
127 #define addr_prefixlen(bs) ((int) ((bs)->length * 8 - ((bs)->flags & 7)))
130 * i2r handler for one address bitstring.
132 static int i2r_address(BIO *out,
134 const unsigned char fill, const ASN1_BIT_STRING *bs)
136 unsigned char addr[ADDR_RAW_BUF_LEN];
143 if (!addr_expand(addr, bs, 4, fill))
145 BIO_printf(out, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
147 /* TODO possibly combine with ipaddr_to_asc() */
149 if (!addr_expand(addr, bs, 16, fill))
151 for (n = 16; n > 1 && addr[n - 1] == 0x00 && addr[n - 2] == 0x00;
153 for (i = 0; i < n; i += 2)
154 BIO_printf(out, "%x%s", (addr[i] << 8) | addr[i + 1],
155 (i < 14 ? ":" : ""));
162 for (i = 0; i < bs->length; i++)
163 BIO_printf(out, "%s%02x", (i > 0 ? ":" : ""), bs->data[i]);
164 BIO_printf(out, "[%d]", (int)(bs->flags & 7));
171 * i2r handler for a sequence of addresses and ranges.
173 static int i2r_IPAddressOrRanges(BIO *out,
175 const IPAddressOrRanges *aors,
179 for (i = 0; i < sk_IPAddressOrRange_num(aors); i++) {
180 const IPAddressOrRange *aor = sk_IPAddressOrRange_value(aors, i);
181 BIO_printf(out, "%*s", indent, "");
183 case IPAddressOrRange_addressPrefix:
184 if (!i2r_address(out, afi, 0x00, aor->u.addressPrefix))
186 BIO_printf(out, "/%d\n", addr_prefixlen(aor->u.addressPrefix));
188 case IPAddressOrRange_addressRange:
189 if (!i2r_address(out, afi, 0x00, aor->u.addressRange->min))
192 if (!i2r_address(out, afi, 0xFF, aor->u.addressRange->max))
202 * i2r handler for an IPAddrBlocks extension.
204 static int i2r_IPAddrBlocks(const X509V3_EXT_METHOD *method,
205 void *ext, BIO *out, int indent)
207 const IPAddrBlocks *addr = ext;
209 for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
210 IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
211 const unsigned int afi = X509v3_addr_get_afi(f);
214 BIO_printf(out, "%*sIPv4", indent, "");
217 BIO_printf(out, "%*sIPv6", indent, "");
220 BIO_printf(out, "%*sUnknown AFI %u", indent, "", afi);
223 if (f->addressFamily->length > 2) {
224 switch (f->addressFamily->data[2]) {
226 BIO_puts(out, " (Unicast)");
229 BIO_puts(out, " (Multicast)");
232 BIO_puts(out, " (Unicast/Multicast)");
235 BIO_puts(out, " (MPLS)");
238 BIO_puts(out, " (Tunnel)");
241 BIO_puts(out, " (VPLS)");
244 BIO_puts(out, " (BGP MDT)");
247 BIO_puts(out, " (MPLS-labeled VPN)");
250 BIO_printf(out, " (Unknown SAFI %u)",
251 (unsigned)f->addressFamily->data[2]);
255 switch (f->ipAddressChoice->type) {
256 case IPAddressChoice_inherit:
257 BIO_puts(out, ": inherit\n");
259 case IPAddressChoice_addressesOrRanges:
260 BIO_puts(out, ":\n");
261 if (!i2r_IPAddressOrRanges(out,
264 u.addressesOrRanges, afi))
273 * Sort comparison function for a sequence of IPAddressOrRange
276 * There's no sane answer we can give if addr_expand() fails, and an
277 * assertion failure on externally supplied data is seriously uncool,
278 * so we just arbitrarily declare that if given invalid inputs this
279 * function returns -1. If this messes up your preferred sort order
280 * for garbage input, tough noogies.
282 static int IPAddressOrRange_cmp(const IPAddressOrRange *a,
283 const IPAddressOrRange *b, const int length)
285 unsigned char addr_a[ADDR_RAW_BUF_LEN], addr_b[ADDR_RAW_BUF_LEN];
286 int prefixlen_a = 0, prefixlen_b = 0;
290 case IPAddressOrRange_addressPrefix:
291 if (!addr_expand(addr_a, a->u.addressPrefix, length, 0x00))
293 prefixlen_a = addr_prefixlen(a->u.addressPrefix);
295 case IPAddressOrRange_addressRange:
296 if (!addr_expand(addr_a, a->u.addressRange->min, length, 0x00))
298 prefixlen_a = length * 8;
303 case IPAddressOrRange_addressPrefix:
304 if (!addr_expand(addr_b, b->u.addressPrefix, length, 0x00))
306 prefixlen_b = addr_prefixlen(b->u.addressPrefix);
308 case IPAddressOrRange_addressRange:
309 if (!addr_expand(addr_b, b->u.addressRange->min, length, 0x00))
311 prefixlen_b = length * 8;
315 if ((r = memcmp(addr_a, addr_b, length)) != 0)
318 return prefixlen_a - prefixlen_b;
322 * IPv4-specific closure over IPAddressOrRange_cmp, since sk_sort()
323 * comparison routines are only allowed two arguments.
325 static int v4IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
326 const IPAddressOrRange *const *b)
328 return IPAddressOrRange_cmp(*a, *b, 4);
332 * IPv6-specific closure over IPAddressOrRange_cmp, since sk_sort()
333 * comparison routines are only allowed two arguments.
335 static int v6IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
336 const IPAddressOrRange *const *b)
338 return IPAddressOrRange_cmp(*a, *b, 16);
342 * Calculate whether a range collapses to a prefix.
343 * See last paragraph of RFC 3779 2.2.3.7.
345 static int range_should_be_prefix(const unsigned char *min,
346 const unsigned char *max, const int length)
351 if (memcmp(min, max, length) <= 0)
353 for (i = 0; i < length && min[i] == max[i]; i++) ;
354 for (j = length - 1; j >= 0 && min[j] == 0x00 && max[j] == 0xFF; j--) ;
359 mask = min[i] ^ max[i];
385 if ((min[i] & mask) != 0 || (max[i] & mask) != mask)
392 * Construct a prefix.
394 static int make_addressPrefix(IPAddressOrRange **result,
395 unsigned char *addr, const int prefixlen)
397 int bytelen = (prefixlen + 7) / 8, bitlen = prefixlen % 8;
398 IPAddressOrRange *aor = IPAddressOrRange_new();
402 aor->type = IPAddressOrRange_addressPrefix;
403 if (aor->u.addressPrefix == NULL &&
404 (aor->u.addressPrefix = ASN1_BIT_STRING_new()) == NULL)
406 if (!ASN1_BIT_STRING_set(aor->u.addressPrefix, addr, bytelen))
408 aor->u.addressPrefix->flags &= ~7;
409 aor->u.addressPrefix->flags |= ASN1_STRING_FLAG_BITS_LEFT;
411 aor->u.addressPrefix->data[bytelen - 1] &= ~(0xFF >> bitlen);
412 aor->u.addressPrefix->flags |= 8 - bitlen;
419 IPAddressOrRange_free(aor);
424 * Construct a range. If it can be expressed as a prefix,
425 * return a prefix instead. Doing this here simplifies
426 * the rest of the code considerably.
428 static int make_addressRange(IPAddressOrRange **result,
430 unsigned char *max, const int length)
432 IPAddressOrRange *aor;
435 if ((prefixlen = range_should_be_prefix(min, max, length)) >= 0)
436 return make_addressPrefix(result, min, prefixlen);
438 if ((aor = IPAddressOrRange_new()) == NULL)
440 aor->type = IPAddressOrRange_addressRange;
441 if ((aor->u.addressRange = IPAddressRange_new()) == NULL)
443 if (aor->u.addressRange->min == NULL &&
444 (aor->u.addressRange->min = ASN1_BIT_STRING_new()) == NULL)
446 if (aor->u.addressRange->max == NULL &&
447 (aor->u.addressRange->max = ASN1_BIT_STRING_new()) == NULL)
450 for (i = length; i > 0 && min[i - 1] == 0x00; --i) ;
451 if (!ASN1_BIT_STRING_set(aor->u.addressRange->min, min, i))
453 aor->u.addressRange->min->flags &= ~7;
454 aor->u.addressRange->min->flags |= ASN1_STRING_FLAG_BITS_LEFT;
456 unsigned char b = min[i - 1];
458 while ((b & (0xFFU >> j)) != 0)
460 aor->u.addressRange->min->flags |= 8 - j;
463 for (i = length; i > 0 && max[i - 1] == 0xFF; --i) ;
464 if (!ASN1_BIT_STRING_set(aor->u.addressRange->max, max, i))
466 aor->u.addressRange->max->flags &= ~7;
467 aor->u.addressRange->max->flags |= ASN1_STRING_FLAG_BITS_LEFT;
469 unsigned char b = max[i - 1];
471 while ((b & (0xFFU >> j)) != (0xFFU >> j))
473 aor->u.addressRange->max->flags |= 8 - j;
480 IPAddressOrRange_free(aor);
485 * Construct a new address family or find an existing one.
487 static IPAddressFamily *make_IPAddressFamily(IPAddrBlocks *addr,
489 const unsigned *safi)
492 unsigned char key[3];
496 key[0] = (afi >> 8) & 0xFF;
499 key[2] = *safi & 0xFF;
505 for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
506 f = sk_IPAddressFamily_value(addr, i);
507 if (f->addressFamily->length == keylen &&
508 !memcmp(f->addressFamily->data, key, keylen))
512 if ((f = IPAddressFamily_new()) == NULL)
514 if (f->ipAddressChoice == NULL &&
515 (f->ipAddressChoice = IPAddressChoice_new()) == NULL)
517 if (f->addressFamily == NULL &&
518 (f->addressFamily = ASN1_OCTET_STRING_new()) == NULL)
520 if (!ASN1_OCTET_STRING_set(f->addressFamily, key, keylen))
522 if (!sk_IPAddressFamily_push(addr, f))
528 IPAddressFamily_free(f);
533 * Add an inheritance element.
535 int X509v3_addr_add_inherit(IPAddrBlocks *addr,
536 const unsigned afi, const unsigned *safi)
538 IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
540 f->ipAddressChoice == NULL ||
541 (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
542 f->ipAddressChoice->u.addressesOrRanges != NULL))
544 if (f->ipAddressChoice->type == IPAddressChoice_inherit &&
545 f->ipAddressChoice->u.inherit != NULL)
547 if (f->ipAddressChoice->u.inherit == NULL &&
548 (f->ipAddressChoice->u.inherit = ASN1_NULL_new()) == NULL)
550 f->ipAddressChoice->type = IPAddressChoice_inherit;
555 * Construct an IPAddressOrRange sequence, or return an existing one.
557 static IPAddressOrRanges *make_prefix_or_range(IPAddrBlocks *addr,
559 const unsigned *safi)
561 IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
562 IPAddressOrRanges *aors = NULL;
565 f->ipAddressChoice == NULL ||
566 (f->ipAddressChoice->type == IPAddressChoice_inherit &&
567 f->ipAddressChoice->u.inherit != NULL))
569 if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges)
570 aors = f->ipAddressChoice->u.addressesOrRanges;
573 if ((aors = sk_IPAddressOrRange_new_null()) == NULL)
577 (void)sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
580 (void)sk_IPAddressOrRange_set_cmp_func(aors, v6IPAddressOrRange_cmp);
583 f->ipAddressChoice->type = IPAddressChoice_addressesOrRanges;
584 f->ipAddressChoice->u.addressesOrRanges = aors;
591 int X509v3_addr_add_prefix(IPAddrBlocks *addr,
593 const unsigned *safi,
594 unsigned char *a, const int prefixlen)
596 IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
597 IPAddressOrRange *aor;
598 if (aors == NULL || !make_addressPrefix(&aor, a, prefixlen))
600 if (sk_IPAddressOrRange_push(aors, aor))
602 IPAddressOrRange_free(aor);
609 int X509v3_addr_add_range(IPAddrBlocks *addr,
611 const unsigned *safi,
612 unsigned char *min, unsigned char *max)
614 IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
615 IPAddressOrRange *aor;
616 int length = length_from_afi(afi);
619 if (!make_addressRange(&aor, min, max, length))
621 if (sk_IPAddressOrRange_push(aors, aor))
623 IPAddressOrRange_free(aor);
628 * Extract min and max values from an IPAddressOrRange.
630 static int extract_min_max(IPAddressOrRange *aor,
631 unsigned char *min, unsigned char *max, int length)
633 if (aor == NULL || min == NULL || max == NULL)
636 case IPAddressOrRange_addressPrefix:
637 return (addr_expand(min, aor->u.addressPrefix, length, 0x00) &&
638 addr_expand(max, aor->u.addressPrefix, length, 0xFF));
639 case IPAddressOrRange_addressRange:
640 return (addr_expand(min, aor->u.addressRange->min, length, 0x00) &&
641 addr_expand(max, aor->u.addressRange->max, length, 0xFF));
647 * Public wrapper for extract_min_max().
649 int X509v3_addr_get_range(IPAddressOrRange *aor,
652 unsigned char *max, const int length)
654 int afi_length = length_from_afi(afi);
655 if (aor == NULL || min == NULL || max == NULL ||
656 afi_length == 0 || length < afi_length ||
657 (aor->type != IPAddressOrRange_addressPrefix &&
658 aor->type != IPAddressOrRange_addressRange) ||
659 !extract_min_max(aor, min, max, afi_length))
666 * Sort comparison function for a sequence of IPAddressFamily.
668 * The last paragraph of RFC 3779 2.2.3.3 is slightly ambiguous about
669 * the ordering: I can read it as meaning that IPv6 without a SAFI
670 * comes before IPv4 with a SAFI, which seems pretty weird. The
671 * examples in appendix B suggest that the author intended the
672 * null-SAFI rule to apply only within a single AFI, which is what I
673 * would have expected and is what the following code implements.
675 static int IPAddressFamily_cmp(const IPAddressFamily *const *a_,
676 const IPAddressFamily *const *b_)
678 const ASN1_OCTET_STRING *a = (*a_)->addressFamily;
679 const ASN1_OCTET_STRING *b = (*b_)->addressFamily;
680 int len = ((a->length <= b->length) ? a->length : b->length);
681 int cmp = memcmp(a->data, b->data, len);
682 return cmp ? cmp : a->length - b->length;
686 * Check whether an IPAddrBLocks is in canonical form.
688 int X509v3_addr_is_canonical(IPAddrBlocks *addr)
690 unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
691 unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
692 IPAddressOrRanges *aors;
696 * Empty extension is canonical.
702 * Check whether the top-level list is in order.
704 for (i = 0; i < sk_IPAddressFamily_num(addr) - 1; i++) {
705 const IPAddressFamily *a = sk_IPAddressFamily_value(addr, i);
706 const IPAddressFamily *b = sk_IPAddressFamily_value(addr, i + 1);
707 if (IPAddressFamily_cmp(&a, &b) >= 0)
712 * Top level's ok, now check each address family.
714 for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
715 IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
716 int length = length_from_afi(X509v3_addr_get_afi(f));
719 * Inheritance is canonical. Anything other than inheritance or
720 * a SEQUENCE OF IPAddressOrRange is an ASN.1 error or something.
722 if (f == NULL || f->ipAddressChoice == NULL)
724 switch (f->ipAddressChoice->type) {
725 case IPAddressChoice_inherit:
727 case IPAddressChoice_addressesOrRanges:
734 * It's an IPAddressOrRanges sequence, check it.
736 aors = f->ipAddressChoice->u.addressesOrRanges;
737 if (sk_IPAddressOrRange_num(aors) == 0)
739 for (j = 0; j < sk_IPAddressOrRange_num(aors) - 1; j++) {
740 IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
741 IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, j + 1);
743 if (!extract_min_max(a, a_min, a_max, length) ||
744 !extract_min_max(b, b_min, b_max, length))
748 * Punt misordered list, overlapping start, or inverted range.
750 if (memcmp(a_min, b_min, length) >= 0 ||
751 memcmp(a_min, a_max, length) > 0 ||
752 memcmp(b_min, b_max, length) > 0)
756 * Punt if adjacent or overlapping. Check for adjacency by
757 * subtracting one from b_min first.
759 for (k = length - 1; k >= 0 && b_min[k]-- == 0x00; k--) ;
760 if (memcmp(a_max, b_min, length) >= 0)
764 * Check for range that should be expressed as a prefix.
766 if (a->type == IPAddressOrRange_addressRange &&
767 range_should_be_prefix(a_min, a_max, length) >= 0)
772 * Check range to see if it's inverted or should be a
775 j = sk_IPAddressOrRange_num(aors) - 1;
777 IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
778 if (a != NULL && a->type == IPAddressOrRange_addressRange) {
779 if (!extract_min_max(a, a_min, a_max, length))
781 if (memcmp(a_min, a_max, length) > 0 ||
782 range_should_be_prefix(a_min, a_max, length) >= 0)
789 * If we made it through all that, we're happy.
795 * Whack an IPAddressOrRanges into canonical form.
797 static int IPAddressOrRanges_canonize(IPAddressOrRanges *aors,
800 int i, j, length = length_from_afi(afi);
803 * Sort the IPAddressOrRanges sequence.
805 sk_IPAddressOrRange_sort(aors);
808 * Clean up representation issues, punt on duplicates or overlaps.
810 for (i = 0; i < sk_IPAddressOrRange_num(aors) - 1; i++) {
811 IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, i);
812 IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, i + 1);
813 unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
814 unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
816 if (!extract_min_max(a, a_min, a_max, length) ||
817 !extract_min_max(b, b_min, b_max, length))
821 * Punt inverted ranges.
823 if (memcmp(a_min, a_max, length) > 0 ||
824 memcmp(b_min, b_max, length) > 0)
830 if (memcmp(a_max, b_min, length) >= 0)
834 * Merge if a and b are adjacent. We check for
835 * adjacency by subtracting one from b_min first.
837 for (j = length - 1; j >= 0 && b_min[j]-- == 0x00; j--) ;
838 if (memcmp(a_max, b_min, length) == 0) {
839 IPAddressOrRange *merged;
840 if (!make_addressRange(&merged, a_min, b_max, length))
842 (void)sk_IPAddressOrRange_set(aors, i, merged);
843 (void)sk_IPAddressOrRange_delete(aors, i + 1);
844 IPAddressOrRange_free(a);
845 IPAddressOrRange_free(b);
852 * Check for inverted final range.
854 j = sk_IPAddressOrRange_num(aors) - 1;
856 IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
857 if (a != NULL && a->type == IPAddressOrRange_addressRange) {
858 unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
859 if (!extract_min_max(a, a_min, a_max, length))
861 if (memcmp(a_min, a_max, length) > 0)
870 * Whack an IPAddrBlocks extension into canonical form.
872 int X509v3_addr_canonize(IPAddrBlocks *addr)
875 for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
876 IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
877 if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
878 !IPAddressOrRanges_canonize(f->ipAddressChoice->
880 X509v3_addr_get_afi(f)))
883 (void)sk_IPAddressFamily_set_cmp_func(addr, IPAddressFamily_cmp);
884 sk_IPAddressFamily_sort(addr);
885 if (!ossl_assert(X509v3_addr_is_canonical(addr)))
891 * v2i handler for the IPAddrBlocks extension.
893 static void *v2i_IPAddrBlocks(const struct v3_ext_method *method,
894 struct v3_ext_ctx *ctx,
895 STACK_OF(CONF_VALUE) *values)
897 static const char v4addr_chars[] = "0123456789.";
898 static const char v6addr_chars[] = "0123456789.:abcdefABCDEF";
899 IPAddrBlocks *addr = NULL;
903 if ((addr = sk_IPAddressFamily_new(IPAddressFamily_cmp)) == NULL) {
904 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
908 for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
909 CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
910 unsigned char min[ADDR_RAW_BUF_LEN], max[ADDR_RAW_BUF_LEN];
911 unsigned afi, *safi = NULL, safi_;
912 const char *addr_chars = NULL;
913 int prefixlen, i1, i2, delim, length;
915 if (!v3_name_cmp(val->name, "IPv4")) {
917 } else if (!v3_name_cmp(val->name, "IPv6")) {
919 } else if (!v3_name_cmp(val->name, "IPv4-SAFI")) {
922 } else if (!v3_name_cmp(val->name, "IPv6-SAFI")) {
926 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
927 X509V3_R_EXTENSION_NAME_ERROR);
928 X509V3_conf_err(val);
934 addr_chars = v4addr_chars;
937 addr_chars = v6addr_chars;
941 length = length_from_afi(afi);
944 * Handle SAFI, if any, and OPENSSL_strdup() so we can null-terminate
945 * the other input values.
948 *safi = strtoul(val->value, &t, 0);
949 t += strspn(t, " \t");
950 if (*safi > 0xFF || *t++ != ':') {
951 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_SAFI);
952 X509V3_conf_err(val);
955 t += strspn(t, " \t");
956 s = OPENSSL_strdup(t);
958 s = OPENSSL_strdup(val->value);
961 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
966 * Check for inheritance. Not worth additional complexity to
967 * optimize this (seldom-used) case.
969 if (strcmp(s, "inherit") == 0) {
970 if (!X509v3_addr_add_inherit(addr, afi, safi)) {
971 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
972 X509V3_R_INVALID_INHERITANCE);
973 X509V3_conf_err(val);
981 i1 = strspn(s, addr_chars);
982 i2 = i1 + strspn(s + i1, " \t");
986 if (a2i_ipadd(min, s) != length) {
987 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_IPADDRESS);
988 X509V3_conf_err(val);
994 prefixlen = (int)strtoul(s + i2, &t, 10);
995 if (t == s + i2 || *t != '\0') {
996 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
997 X509V3_R_EXTENSION_VALUE_ERROR);
998 X509V3_conf_err(val);
1001 if (!X509v3_addr_add_prefix(addr, afi, safi, min, prefixlen)) {
1002 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1007 i1 = i2 + strspn(s + i2, " \t");
1008 i2 = i1 + strspn(s + i1, addr_chars);
1009 if (i1 == i2 || s[i2] != '\0') {
1010 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1011 X509V3_R_EXTENSION_VALUE_ERROR);
1012 X509V3_conf_err(val);
1015 if (a2i_ipadd(max, s + i1) != length) {
1016 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1017 X509V3_R_INVALID_IPADDRESS);
1018 X509V3_conf_err(val);
1021 if (memcmp(min, max, length_from_afi(afi)) > 0) {
1022 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1023 X509V3_R_EXTENSION_VALUE_ERROR);
1024 X509V3_conf_err(val);
1027 if (!X509v3_addr_add_range(addr, afi, safi, min, max)) {
1028 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1033 if (!X509v3_addr_add_prefix(addr, afi, safi, min, length * 8)) {
1034 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1039 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1040 X509V3_R_EXTENSION_VALUE_ERROR);
1041 X509V3_conf_err(val);
1050 * Canonize the result, then we're done.
1052 if (!X509v3_addr_canonize(addr))
1058 sk_IPAddressFamily_pop_free(addr, IPAddressFamily_free);
1065 const X509V3_EXT_METHOD v3_addr = {
1066 NID_sbgp_ipAddrBlock, /* nid */
1068 ASN1_ITEM_ref(IPAddrBlocks), /* template */
1069 0, 0, 0, 0, /* old functions, ignored */
1073 v2i_IPAddrBlocks, /* v2i */
1074 i2r_IPAddrBlocks, /* i2r */
1076 NULL /* extension-specific data */
1080 * Figure out whether extension sues inheritance.
1082 int X509v3_addr_inherits(IPAddrBlocks *addr)
1087 for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
1088 IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
1089 if (f->ipAddressChoice->type == IPAddressChoice_inherit)
1096 * Figure out whether parent contains child.
1098 static int addr_contains(IPAddressOrRanges *parent,
1099 IPAddressOrRanges *child, int length)
1101 unsigned char p_min[ADDR_RAW_BUF_LEN], p_max[ADDR_RAW_BUF_LEN];
1102 unsigned char c_min[ADDR_RAW_BUF_LEN], c_max[ADDR_RAW_BUF_LEN];
1105 if (child == NULL || parent == child)
1111 for (c = 0; c < sk_IPAddressOrRange_num(child); c++) {
1112 if (!extract_min_max(sk_IPAddressOrRange_value(child, c),
1113 c_min, c_max, length))
1116 if (p >= sk_IPAddressOrRange_num(parent))
1118 if (!extract_min_max(sk_IPAddressOrRange_value(parent, p),
1119 p_min, p_max, length))
1121 if (memcmp(p_max, c_max, length) < 0)
1123 if (memcmp(p_min, c_min, length) > 0)
1133 * Test whether a is a subset of b.
1135 int X509v3_addr_subset(IPAddrBlocks *a, IPAddrBlocks *b)
1138 if (a == NULL || a == b)
1140 if (b == NULL || X509v3_addr_inherits(a) || X509v3_addr_inherits(b))
1142 (void)sk_IPAddressFamily_set_cmp_func(b, IPAddressFamily_cmp);
1143 for (i = 0; i < sk_IPAddressFamily_num(a); i++) {
1144 IPAddressFamily *fa = sk_IPAddressFamily_value(a, i);
1145 int j = sk_IPAddressFamily_find(b, fa);
1146 IPAddressFamily *fb;
1147 fb = sk_IPAddressFamily_value(b, j);
1150 if (!addr_contains(fb->ipAddressChoice->u.addressesOrRanges,
1151 fa->ipAddressChoice->u.addressesOrRanges,
1152 length_from_afi(X509v3_addr_get_afi(fb))))
1159 * Validation error handling via callback.
1161 #define validation_err(_err_) \
1163 if (ctx != NULL) { \
1164 ctx->error = _err_; \
1165 ctx->error_depth = i; \
1166 ctx->current_cert = x; \
1167 ret = ctx->verify_cb(0, ctx); \
1176 * Core code for RFC 3779 2.3 path validation.
1178 * Returns 1 for success, 0 on error.
1180 * When returning 0, ctx->error MUST be set to an appropriate value other than
1183 static int addr_validate_path_internal(X509_STORE_CTX *ctx,
1184 STACK_OF(X509) *chain,
1187 IPAddrBlocks *child = NULL;
1191 if (!ossl_assert(chain != NULL && sk_X509_num(chain) > 0)
1192 || !ossl_assert(ctx != NULL || ext != NULL)
1193 || !ossl_assert(ctx == NULL || ctx->verify_cb != NULL)) {
1195 ctx->error = X509_V_ERR_UNSPECIFIED;
1200 * Figure out where to start. If we don't have an extension to
1201 * check, we're done. Otherwise, check canonical form and
1202 * set up for walking up the chain.
1209 x = sk_X509_value(chain, i);
1210 if ((ext = x->rfc3779_addr) == NULL)
1213 if (!X509v3_addr_is_canonical(ext))
1214 validation_err(X509_V_ERR_INVALID_EXTENSION);
1215 (void)sk_IPAddressFamily_set_cmp_func(ext, IPAddressFamily_cmp);
1216 if ((child = sk_IPAddressFamily_dup(ext)) == NULL) {
1217 X509V3err(X509V3_F_ADDR_VALIDATE_PATH_INTERNAL,
1218 ERR_R_MALLOC_FAILURE);
1220 ctx->error = X509_V_ERR_OUT_OF_MEM;
1226 * Now walk up the chain. No cert may list resources that its
1227 * parent doesn't list.
1229 for (i++; i < sk_X509_num(chain); i++) {
1230 x = sk_X509_value(chain, i);
1231 if (!X509v3_addr_is_canonical(x->rfc3779_addr))
1232 validation_err(X509_V_ERR_INVALID_EXTENSION);
1233 if (x->rfc3779_addr == NULL) {
1234 for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1235 IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1236 if (fc->ipAddressChoice->type != IPAddressChoice_inherit) {
1237 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1243 (void)sk_IPAddressFamily_set_cmp_func(x->rfc3779_addr,
1244 IPAddressFamily_cmp);
1245 for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1246 IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1247 int k = sk_IPAddressFamily_find(x->rfc3779_addr, fc);
1248 IPAddressFamily *fp =
1249 sk_IPAddressFamily_value(x->rfc3779_addr, k);
1251 if (fc->ipAddressChoice->type ==
1252 IPAddressChoice_addressesOrRanges) {
1253 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1258 if (fp->ipAddressChoice->type ==
1259 IPAddressChoice_addressesOrRanges) {
1260 if (fc->ipAddressChoice->type == IPAddressChoice_inherit
1261 || addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
1262 fc->ipAddressChoice->u.addressesOrRanges,
1263 length_from_afi(X509v3_addr_get_afi(fc))))
1264 sk_IPAddressFamily_set(child, j, fp);
1266 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1272 * Trust anchor can't inherit.
1274 if (x->rfc3779_addr != NULL) {
1275 for (j = 0; j < sk_IPAddressFamily_num(x->rfc3779_addr); j++) {
1276 IPAddressFamily *fp =
1277 sk_IPAddressFamily_value(x->rfc3779_addr, j);
1278 if (fp->ipAddressChoice->type == IPAddressChoice_inherit
1279 && sk_IPAddressFamily_find(child, fp) >= 0)
1280 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1285 sk_IPAddressFamily_free(child);
1289 #undef validation_err
1292 * RFC 3779 2.3 path validation -- called from X509_verify_cert().
1294 int X509v3_addr_validate_path(X509_STORE_CTX *ctx)
1296 if (ctx->chain == NULL
1297 || sk_X509_num(ctx->chain) == 0
1298 || ctx->verify_cb == NULL) {
1299 ctx->error = X509_V_ERR_UNSPECIFIED;
1302 return addr_validate_path_internal(ctx, ctx->chain, NULL);
1306 * RFC 3779 2.3 path validation of an extension.
1307 * Test whether chain covers extension.
1309 int X509v3_addr_validate_resource_set(STACK_OF(X509) *chain,
1310 IPAddrBlocks *ext, int allow_inheritance)
1314 if (chain == NULL || sk_X509_num(chain) == 0)
1316 if (!allow_inheritance && X509v3_addr_inherits(ext))
1318 return addr_validate_path_internal(NULL, chain, ext);
1321 #endif /* OPENSSL_NO_RFC3779 */