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|
/* $OpenBSD: cert.c,v 1.84 2022/05/31 18:51:35 tb Exp $ */
/*
* Copyright (c) 2022 Theo Buehler <tb@openbsd.org>
* Copyright (c) 2021 Job Snijders <job@openbsd.org>
* Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/socket.h>
#include <arpa/inet.h>
#include <assert.h>
#include <err.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openssl/asn1.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "extern.h"
/*
* A parsing sequence of a file (which may just be <stdin>).
*/
struct parse {
struct cert *res; /* result */
const char *fn; /* currently-parsed file */
};
extern ASN1_OBJECT *certpol_oid; /* id-cp-ipAddr-asNumber cert policy */
extern ASN1_OBJECT *carepo_oid; /* 1.3.6.1.5.5.7.48.5 (caRepository) */
extern ASN1_OBJECT *manifest_oid; /* 1.3.6.1.5.5.7.48.10 (rpkiManifest) */
extern ASN1_OBJECT *notify_oid; /* 1.3.6.1.5.5.7.48.13 (rpkiNotify) */
/*
* Append an IP address structure to our list of results.
* This will also constrain us to having at most one inheritance
* statement per AFI and also not have overlapping ranges (as prohibited
* in section 2.2.3.6).
* It does not make sure that ranges can't coalesce, that is, that any
* two ranges abut each other.
* This is warned against in section 2.2.3.6, but doesn't change the
* semantics of the system.
* Returns zero on failure (IP overlap) non-zero on success.
*/
static int
append_ip(const char *fn, struct cert_ip *ips, size_t *ipsz,
const struct cert_ip *ip)
{
if (!ip_addr_check_overlap(ip, fn, ips, *ipsz))
return 0;
ips[(*ipsz)++] = *ip;
return 1;
}
/*
* Append an AS identifier structure to our list of results.
* Makes sure that the identifiers do not overlap or improperly inherit
* as defined by RFC 3779 section 3.3.
*/
static int
append_as(const char *fn, struct cert_as *ases, size_t *asz,
const struct cert_as *as)
{
if (!as_check_overlap(as, fn, ases, *asz))
return 0;
ases[(*asz)++] = *as;
return 1;
}
/*
* Parse a range of AS identifiers as in 3.2.3.8.
* Returns zero on failure, non-zero on success.
*/
int
sbgp_as_range(const char *fn, struct cert_as *ases, size_t *asz,
const ASRange *range)
{
struct cert_as as;
memset(&as, 0, sizeof(struct cert_as));
as.type = CERT_AS_RANGE;
if (!as_id_parse(range->min, &as.range.min)) {
warnx("%s: RFC 3779 section 3.2.3.8 (via RFC 1930): "
"malformed AS identifier", fn);
return 0;
}
if (!as_id_parse(range->max, &as.range.max)) {
warnx("%s: RFC 3779 section 3.2.3.8 (via RFC 1930): "
"malformed AS identifier", fn);
return 0;
}
if (as.range.max == as.range.min) {
warnx("%s: RFC 3379 section 3.2.3.8: ASRange: "
"range is singular", fn);
return 0;
} else if (as.range.max < as.range.min) {
warnx("%s: RFC 3379 section 3.2.3.8: ASRange: "
"range is out of order", fn);
return 0;
}
return append_as(fn, ases, asz, &as);
}
/*
* Parse an entire 3.2.3.10 integer type.
*/
int
sbgp_as_id(const char *fn, struct cert_as *ases, size_t *asz,
const ASN1_INTEGER *i)
{
struct cert_as as;
memset(&as, 0, sizeof(struct cert_as));
as.type = CERT_AS_ID;
if (!as_id_parse(i, &as.id)) {
warnx("%s: RFC 3779 section 3.2.3.10 (via RFC 1930): "
"malformed AS identifier", fn);
return 0;
}
if (as.id == 0) {
warnx("%s: RFC 3779 section 3.2.3.10 (via RFC 1930): "
"AS identifier zero is reserved", fn);
return 0;
}
return append_as(fn, ases, asz, &as);
}
static int
sbgp_as_inherit(const char *fn, struct cert_as *ases, size_t *asz)
{
struct cert_as as;
memset(&as, 0, sizeof(struct cert_as));
as.type = CERT_AS_INHERIT;
return append_as(fn, ases, asz, &as);
}
/*
* Parse RFC 6487 4.8.11 X509v3 extension, with syntax documented in RFC
* 3779 starting in section 3.2.
* Returns zero on failure, non-zero on success.
*/
static int
sbgp_assysnum(struct parse *p, X509_EXTENSION *ext)
{
ASIdentifiers *asidentifiers = NULL;
const ASIdOrRanges *aors = NULL;
size_t asz;
int i, rc = 0;
if (!X509_EXTENSION_get_critical(ext)) {
cryptowarnx("%s: RFC 6487 section 4.8.11: autonomousSysNum: "
"extension not critical", p->fn);
goto out;
}
if ((asidentifiers = X509V3_EXT_d2i(ext)) == NULL) {
cryptowarnx("%s: RFC 6487 section 4.8.11: autonomousSysNum: "
"failed extension parse", p->fn);
goto out;
}
if (asidentifiers->rdi != NULL) {
warnx("%s: RFC 6487 section 4.8.11: autonomousSysNum: "
"should not have RDI values", p->fn);
goto out;
}
if (asidentifiers->asnum == NULL) {
warnx("%s: RFC 6487 section 4.8.11: autonomousSysNum: "
"no AS number resource set", p->fn);
goto out;
}
switch (asidentifiers->asnum->type) {
case ASIdentifierChoice_inherit:
asz = 1;
break;
case ASIdentifierChoice_asIdsOrRanges:
aors = asidentifiers->asnum->u.asIdsOrRanges;
asz = sk_ASIdOrRange_num(aors);
break;
default:
warnx("%s: RFC 3779 section 3.2.3.2: ASIdentifierChoice: "
"unknown type %d", p->fn, asidentifiers->asnum->type);
goto out;
}
if (asz >= MAX_AS_SIZE) {
warnx("%s: too many AS number entries: limit %d",
p->fn, MAX_AS_SIZE);
goto out;
}
p->res->as = calloc(asz, sizeof(struct cert_as));
if (p->res->as == NULL)
err(1, NULL);
if (aors == NULL) {
if (!sbgp_as_inherit(p->fn, p->res->as, &p->res->asz))
goto out;
}
for (i = 0; i < sk_ASIdOrRange_num(aors); i++) {
const ASIdOrRange *aor;
aor = sk_ASIdOrRange_value(aors, i);
switch (aor->type) {
case ASIdOrRange_id:
if (!sbgp_as_id(p->fn, p->res->as, &p->res->asz,
aor->u.id))
goto out;
break;
case ASIdOrRange_range:
if (!sbgp_as_range(p->fn, p->res->as, &p->res->asz,
aor->u.range))
goto out;
break;
default:
warnx("%s: RFC 3779 section 3.2.3.5: ASIdOrRange: "
"unknown type %d", p->fn, aor->type);
goto out;
}
}
rc = 1;
out:
ASIdentifiers_free(asidentifiers);
return rc;
}
/*
* Construct a RFC 3779 2.2.3.8 range from its bit string.
* Returns zero on failure, non-zero on success.
*/
int
sbgp_addr(const char *fn, struct cert_ip *ips, size_t *ipsz, enum afi afi,
const ASN1_BIT_STRING *bs)
{
struct cert_ip ip;
memset(&ip, 0, sizeof(struct cert_ip));
ip.afi = afi;
ip.type = CERT_IP_ADDR;
if (!ip_addr_parse(bs, afi, fn, &ip.ip)) {
warnx("%s: RFC 3779 section 2.2.3.8: IPAddress: "
"invalid IP address", fn);
return 0;
}
if (!ip_cert_compose_ranges(&ip)) {
warnx("%s: RFC 3779 section 2.2.3.8: IPAddress: "
"IP address range reversed", fn);
return 0;
}
return append_ip(fn, ips, ipsz, &ip);
}
/*
* Parse RFC 3779 2.2.3.9 range of addresses.
* Returns zero on failure, non-zero on success.
*/
int
sbgp_addr_range(const char *fn, struct cert_ip *ips, size_t *ipsz,
enum afi afi, const IPAddressRange *range)
{
struct cert_ip ip;
memset(&ip, 0, sizeof(struct cert_ip));
ip.afi = afi;
ip.type = CERT_IP_RANGE;
if (!ip_addr_parse(range->min, afi, fn, &ip.range.min)) {
warnx("%s: RFC 3779 section 2.2.3.9: IPAddressRange: "
"invalid IP address", fn);
return 0;
}
if (!ip_addr_parse(range->max, afi, fn, &ip.range.max)) {
warnx("%s: RFC 3779 section 2.2.3.9: IPAddressRange: "
"invalid IP address", fn);
return 0;
}
if (!ip_cert_compose_ranges(&ip)) {
warnx("%s: RFC 3779 section 2.2.3.9: IPAddressRange: "
"IP address range reversed", fn);
return 0;
}
return append_ip(fn, ips, ipsz, &ip);
}
static int
sbgp_addr_inherit(const char *fn, struct cert_ip *ips, size_t *ipsz,
enum afi afi)
{
struct cert_ip ip;
memset(&ip, 0, sizeof(struct cert_ip));
ip.afi = afi;
ip.type = CERT_IP_INHERIT;
return append_ip(fn, ips, ipsz, &ip);
}
/*
* Parse an sbgp-ipAddrBlock X509 extension, RFC 6487 4.8.10, with
* syntax documented in RFC 3779 starting in section 2.2.
* Returns zero on failure, non-zero on success.
*/
static int
sbgp_ipaddrblk(struct parse *p, X509_EXTENSION *ext)
{
STACK_OF(IPAddressFamily) *addrblk = NULL;
const IPAddressFamily *af;
const IPAddressOrRanges *aors;
const IPAddressOrRange *aor;
enum afi afi;
size_t ipsz;
int i, j, rc = 0;
if (!X509_EXTENSION_get_critical(ext)) {
cryptowarnx("%s: RFC 6487 section 4.8.10: sbgp-ipAddrBlock: "
"extension not critical", p->fn);
goto out;
}
if ((addrblk = X509V3_EXT_d2i(ext)) == NULL) {
cryptowarnx("%s: RFC 6487 section 4.8.10: sbgp-ipAddrBlock: "
"failed extension parse", p->fn);
goto out;
}
for (i = 0; i < sk_IPAddressFamily_num(addrblk); i++) {
af = sk_IPAddressFamily_value(addrblk, i);
switch (af->ipAddressChoice->type) {
case IPAddressChoice_inherit:
aors = NULL;
ipsz = p->res->ipsz + 1;
break;
case IPAddressChoice_addressesOrRanges:
aors = af->ipAddressChoice->u.addressesOrRanges;
ipsz = p->res->ipsz + sk_IPAddressOrRange_num(aors);
break;
default:
warnx("%s: RFC 3779: IPAddressChoice: unknown type %d",
p->fn, af->ipAddressChoice->type);
goto out;
}
if (ipsz >= MAX_IP_SIZE)
goto out;
p->res->ips = recallocarray(p->res->ips, p->res->ipsz, ipsz,
sizeof(struct cert_ip));
if (p->res->ips == NULL)
err(1, NULL);
if (!ip_addr_afi_parse(p->fn, af->addressFamily, &afi)) {
warnx("%s: RFC 3779: invalid AFI", p->fn);
goto out;
}
if (aors == NULL) {
if (!sbgp_addr_inherit(p->fn, p->res->ips,
&p->res->ipsz, afi))
goto out;
continue;
}
for (j = 0; j < sk_IPAddressOrRange_num(aors); j++) {
aor = sk_IPAddressOrRange_value(aors, j);
switch (aor->type) {
case IPAddressOrRange_addressPrefix:
if (!sbgp_addr(p->fn, p->res->ips,
&p->res->ipsz, afi, aor->u.addressPrefix))
goto out;
break;
case IPAddressOrRange_addressRange:
if (!sbgp_addr_range(p->fn, p->res->ips,
&p->res->ipsz, afi, aor->u.addressRange))
goto out;
break;
default:
warnx("%s: RFC 3779: IPAddressOrRange: "
"unknown type %d", p->fn, aor->type);
goto out;
}
}
}
rc = 1;
out:
sk_IPAddressFamily_pop_free(addrblk, IPAddressFamily_free);
return rc;
}
/*
* Parse "Subject Information Access" extension, RFC 6487 4.8.8.
* Returns zero on failure, non-zero on success.
*/
static int
sbgp_sia(struct parse *p, X509_EXTENSION *ext)
{
AUTHORITY_INFO_ACCESS *sia = NULL;
ACCESS_DESCRIPTION *ad;
ASN1_OBJECT *oid;
int i, rc = 0;
if (X509_EXTENSION_get_critical(ext)) {
warnx("%s: RFC 6487 section 4.8.8: SIA: "
"extension not non-critical", p->fn);
goto out;
}
if ((sia = X509V3_EXT_d2i(ext)) == NULL) {
cryptowarnx("%s: RFC 6487 section 4.8.8: SIA: "
"failed extension parse", p->fn);
goto out;
}
for (i = 0; i < sk_ACCESS_DESCRIPTION_num(sia); i++) {
ad = sk_ACCESS_DESCRIPTION_value(sia, i);
oid = ad->method;
if (OBJ_cmp(oid, carepo_oid) == 0) {
if (!x509_location(p->fn, "SIA: caRepository",
"rsync://", ad->location, &p->res->repo))
goto out;
} else if (OBJ_cmp(oid, manifest_oid) == 0) {
if (!x509_location(p->fn, "SIA: rpkiManifest",
"rsync://", ad->location, &p->res->mft))
goto out;
} else if (OBJ_cmp(oid, notify_oid) == 0) {
if (!x509_location(p->fn, "SIA: rpkiNotify",
"https://", ad->location, &p->res->notify))
goto out;
}
}
if (p->res->mft == NULL || p->res->repo == NULL) {
warnx("%s: RFC 6487 section 4.8.8: SIA: missing caRepository "
"or rpkiManifest", p->fn);
goto out;
}
if (strstr(p->res->mft, p->res->repo) != p->res->mft) {
warnx("%s: RFC 6487 section 4.8.8: SIA: "
"conflicting URIs for caRepository and rpkiManifest",
p->fn);
goto out;
}
if (rtype_from_file_extension(p->res->mft) != RTYPE_MFT) {
warnx("%s: RFC 6487 section 4.8.8: SIA: "
"not an MFT file", p->fn);
goto out;
}
rc = 1;
out:
AUTHORITY_INFO_ACCESS_free(sia);
return rc;
}
/*
* Parse the certificate policies extension and check that it follows RFC 7318.
* Returns zero on failure, non-zero on success.
*/
static int
certificate_policies(struct parse *p, X509_EXTENSION *ext)
{
STACK_OF(POLICYINFO) *policies = NULL;
POLICYINFO *policy;
STACK_OF(POLICYQUALINFO) *qualifiers;
POLICYQUALINFO *qualifier;
int nid;
int rc = 0;
if (!X509_EXTENSION_get_critical(ext)) {
cryptowarnx("%s: RFC 6487 section 4.8.9: certificatePolicies: "
"extension not critical", p->fn);
goto out;
}
if ((policies = X509V3_EXT_d2i(ext)) == NULL) {
cryptowarnx("%s: RFC 6487 section 4.8.9: certificatePolicies: "
"failed extension parse", p->fn);
goto out;
}
if (sk_POLICYINFO_num(policies) != 1) {
warnx("%s: RFC 6487 section 4.8.9: certificatePolicies: "
"want 1 policy, got %d", p->fn,
sk_POLICYINFO_num(policies));
goto out;
}
policy = sk_POLICYINFO_value(policies, 0);
assert(policy != NULL && policy->policyid != NULL);
if (OBJ_cmp(policy->policyid, certpol_oid) != 0) {
char pbuf[128], cbuf[128];
OBJ_obj2txt(pbuf, sizeof(pbuf), policy->policyid, 1);
OBJ_obj2txt(cbuf, sizeof(cbuf), certpol_oid, 1);
warnx("%s: RFC 7318 section 2: certificatePolicies: "
"unexpected OID: %s, want %s", p->fn, pbuf, cbuf);
goto out;
}
/* Policy qualifiers are optional. If they're absent, we're done. */
if ((qualifiers = policy->qualifiers) == NULL) {
rc = 1;
goto out;
}
if (sk_POLICYQUALINFO_num(qualifiers) != 1) {
warnx("%s: RFC 7318 section 2: certificatePolicies: "
"want 1 policy qualifier, got %d", p->fn,
sk_POLICYQUALINFO_num(qualifiers));
goto out;
}
qualifier = sk_POLICYQUALINFO_value(qualifiers, 0);
assert(qualifier != NULL && qualifier->pqualid != NULL);
if ((nid = OBJ_obj2nid(qualifier->pqualid)) != NID_id_qt_cps) {
warnx("%s: RFC 7318 section 2: certificatePolicies: "
"want CPS, got %d (%s)", p->fn, nid, OBJ_nid2sn(nid));
goto out;
}
if (verbose > 1)
warnx("%s: CPS %.*s", p->fn, qualifier->d.cpsuri->length,
qualifier->d.cpsuri->data);
rc = 1;
out:
sk_POLICYINFO_pop_free(policies, POLICYINFO_free);
return rc;
}
/*
* Parse and partially validate an RPKI X509 certificate (either a trust
* anchor or a certificate) as defined in RFC 6487.
* Returns the parse results or NULL on failure.
*/
struct cert *
cert_parse_pre(const char *fn, const unsigned char *der, size_t len)
{
int extsz;
int sia_present = 0;
size_t i;
X509 *x = NULL;
X509_EXTENSION *ext = NULL;
ASN1_OBJECT *obj;
struct parse p;
/* just fail for empty buffers, the warning was printed elsewhere */
if (der == NULL)
return NULL;
memset(&p, 0, sizeof(struct parse));
p.fn = fn;
if ((p.res = calloc(1, sizeof(struct cert))) == NULL)
err(1, NULL);
if ((x = d2i_X509(NULL, &der, len)) == NULL) {
cryptowarnx("%s: d2i_X509", p.fn);
goto out;
}
/* Cache X509v3 extensions, see X509_check_ca(3). */
if (X509_check_purpose(x, -1, -1) <= 0) {
cryptowarnx("%s: could not cache X509v3 extensions", p.fn);
goto out;
}
/* Look for X509v3 extensions. */
if ((extsz = X509_get_ext_count(x)) < 0)
cryptoerrx("X509_get_ext_count");
for (i = 0; i < (size_t)extsz; i++) {
ext = X509_get_ext(x, i);
assert(ext != NULL);
obj = X509_EXTENSION_get_object(ext);
assert(obj != NULL);
switch (OBJ_obj2nid(obj)) {
case NID_sbgp_ipAddrBlock:
if (!sbgp_ipaddrblk(&p, ext))
goto out;
break;
case NID_sbgp_autonomousSysNum:
if (!sbgp_assysnum(&p, ext))
goto out;
break;
case NID_sinfo_access:
sia_present = 1;
if (!sbgp_sia(&p, ext))
goto out;
break;
case NID_certificate_policies:
if (!certificate_policies(&p, ext))
goto out;
break;
case NID_crl_distribution_points:
/* ignored here, handled later */
break;
case NID_info_access:
break;
case NID_authority_key_identifier:
break;
case NID_subject_key_identifier:
break;
case NID_ext_key_usage:
break;
default:
/* {
char objn[64];
OBJ_obj2txt(objn, sizeof(objn), obj, 0);
warnx("%s: ignoring %s (NID %d)",
p.fn, objn, OBJ_obj2nid(obj));
} */
break;
}
}
if (!x509_get_aki(x, p.fn, &p.res->aki))
goto out;
if (!x509_get_ski(x, p.fn, &p.res->ski))
goto out;
if (!x509_get_aia(x, p.fn, &p.res->aia))
goto out;
if (!x509_get_crl(x, p.fn, &p.res->crl))
goto out;
if (!x509_get_expire(x, p.fn, &p.res->expires))
goto out;
p.res->purpose = x509_get_purpose(x, p.fn);
/* Validation on required fields. */
switch (p.res->purpose) {
case CERT_PURPOSE_CA:
if (p.res->mft == NULL) {
warnx("%s: RFC 6487 section 4.8.8: missing SIA", p.fn);
goto out;
}
if (p.res->asz == 0 && p.res->ipsz == 0) {
warnx("%s: missing IP or AS resources", p.fn);
goto out;
}
break;
case CERT_PURPOSE_BGPSEC_ROUTER:
p.res->pubkey = x509_get_pubkey(x, p.fn);
if (p.res->pubkey == NULL) {
warnx("%s: x509_get_pubkey failed", p.fn);
goto out;
}
if (p.res->ipsz > 0) {
warnx("%s: unexpected IP resources in BGPsec cert",
p.fn);
goto out;
}
if (sia_present) {
warnx("%s: unexpected SIA extension in BGPsec cert",
p.fn);
goto out;
}
break;
default:
warnx("%s: x509_get_purpose failed in %s", p.fn, __func__);
goto out;
}
if (p.res->ski == NULL) {
warnx("%s: RFC 6487 section 8.4.2: missing SKI", p.fn);
goto out;
}
p.res->x509 = x;
return p.res;
out:
cert_free(p.res);
X509_free(x);
return NULL;
}
struct cert *
cert_parse(const char *fn, struct cert *p)
{
if (p == NULL)
return NULL;
if (p->aki == NULL) {
warnx("%s: RFC 6487 section 8.4.2: "
"non-trust anchor missing AKI", fn);
goto badcert;
}
if (strcmp(p->aki, p->ski) == 0) {
warnx("%s: RFC 6487 section 8.4.2: "
"non-trust anchor AKI may not match SKI", fn);
goto badcert;
}
if (p->aia == NULL) {
warnx("%s: RFC 6487 section 8.4.7: AIA: extension missing", fn);
goto badcert;
}
if (p->crl == NULL) {
warnx("%s: RFC 6487 section 4.8.6: CRL: "
"no CRL distribution point extension", fn);
goto badcert;
}
return p;
badcert:
cert_free(p);
return NULL;
}
struct cert *
ta_parse(const char *fn, struct cert *p, const unsigned char *pkey,
size_t pkeysz)
{
ASN1_TIME *notBefore, *notAfter;
EVP_PKEY *pk, *opk;
if (p == NULL)
return NULL;
/* first check pubkey against the one from the TAL */
pk = d2i_PUBKEY(NULL, &pkey, pkeysz);
if (pk == NULL) {
cryptowarnx("%s: RFC 6487 (trust anchor): bad TAL pubkey", fn);
goto badcert;
}
if ((opk = X509_get0_pubkey(p->x509)) == NULL) {
cryptowarnx("%s: RFC 6487 (trust anchor): missing pubkey", fn);
goto badcert;
}
if (EVP_PKEY_cmp(pk, opk) != 1) {
cryptowarnx("%s: RFC 6487 (trust anchor): "
"pubkey does not match TAL pubkey", fn);
goto badcert;
}
if ((notBefore = X509_get_notBefore(p->x509)) == NULL) {
warnx("%s: certificate has invalid notBefore", fn);
goto badcert;
}
if ((notAfter = X509_get_notAfter(p->x509)) == NULL) {
warnx("%s: certificate has invalid notAfter", fn);
goto badcert;
}
if (X509_cmp_current_time(notBefore) != -1) {
warnx("%s: certificate not yet valid", fn);
goto badcert;
}
if (X509_cmp_current_time(notAfter) != 1) {
warnx("%s: certificate has expired", fn);
goto badcert;
}
if (p->aki != NULL && strcmp(p->aki, p->ski)) {
warnx("%s: RFC 6487 section 8.4.2: "
"trust anchor AKI, if specified, must match SKI", fn);
goto badcert;
}
if (p->aia != NULL) {
warnx("%s: RFC 6487 section 8.4.7: "
"trust anchor must not have AIA", fn);
goto badcert;
}
if (p->crl != NULL) {
warnx("%s: RFC 6487 section 8.4.2: "
"trust anchor may not specify CRL resource", fn);
goto badcert;
}
if (p->purpose == CERT_PURPOSE_BGPSEC_ROUTER) {
warnx("%s: BGPsec cert cannot be a trust anchor", fn);
goto badcert;
}
EVP_PKEY_free(pk);
return p;
badcert:
EVP_PKEY_free(pk);
cert_free(p);
return NULL;
}
/*
* Free parsed certificate contents.
* Passing NULL is a noop.
*/
void
cert_free(struct cert *p)
{
if (p == NULL)
return;
free(p->crl);
free(p->repo);
free(p->mft);
free(p->notify);
free(p->ips);
free(p->as);
free(p->aia);
free(p->aki);
free(p->ski);
free(p->pubkey);
X509_free(p->x509);
free(p);
}
/*
* Write certificate parsed content into buffer.
* See cert_read() for the other side of the pipe.
*/
void
cert_buffer(struct ibuf *b, const struct cert *p)
{
io_simple_buffer(b, &p->expires, sizeof(p->expires));
io_simple_buffer(b, &p->purpose, sizeof(p->purpose));
io_simple_buffer(b, &p->talid, sizeof(p->talid));
io_simple_buffer(b, &p->ipsz, sizeof(p->ipsz));
io_simple_buffer(b, &p->asz, sizeof(p->asz));
io_simple_buffer(b, p->ips, p->ipsz * sizeof(p->ips[0]));
io_simple_buffer(b, p->as, p->asz * sizeof(p->as[0]));
io_str_buffer(b, p->mft);
io_str_buffer(b, p->notify);
io_str_buffer(b, p->repo);
io_str_buffer(b, p->crl);
io_str_buffer(b, p->aia);
io_str_buffer(b, p->aki);
io_str_buffer(b, p->ski);
io_str_buffer(b, p->pubkey);
}
/*
* Allocate and read parsed certificate content from descriptor.
* The pointer must be freed with cert_free().
* Always returns a valid pointer.
*/
struct cert *
cert_read(struct ibuf *b)
{
struct cert *p;
if ((p = calloc(1, sizeof(struct cert))) == NULL)
err(1, NULL);
io_read_buf(b, &p->expires, sizeof(p->expires));
io_read_buf(b, &p->purpose, sizeof(p->purpose));
io_read_buf(b, &p->talid, sizeof(p->talid));
io_read_buf(b, &p->ipsz, sizeof(p->ipsz));
io_read_buf(b, &p->asz, sizeof(p->asz));
p->ips = calloc(p->ipsz, sizeof(struct cert_ip));
if (p->ips == NULL)
err(1, NULL);
io_read_buf(b, p->ips, p->ipsz * sizeof(p->ips[0]));
p->as = calloc(p->asz, sizeof(struct cert_as));
if (p->as == NULL)
err(1, NULL);
io_read_buf(b, p->as, p->asz * sizeof(p->as[0]));
io_read_str(b, &p->mft);
io_read_str(b, &p->notify);
io_read_str(b, &p->repo);
io_read_str(b, &p->crl);
io_read_str(b, &p->aia);
io_read_str(b, &p->aki);
io_read_str(b, &p->ski);
io_read_str(b, &p->pubkey);
assert(p->mft != NULL || p->purpose == CERT_PURPOSE_BGPSEC_ROUTER);
assert(p->ski);
return p;
}
static inline int
authcmp(struct auth *a, struct auth *b)
{
return strcmp(a->cert->ski, b->cert->ski);
}
RB_GENERATE_STATIC(auth_tree, auth, entry, authcmp);
struct auth *
auth_find(struct auth_tree *auths, const char *aki)
{
struct auth a;
struct cert c;
/* we look up the cert where the ski == aki */
c.ski = (char *)aki;
a.cert = &c;
return RB_FIND(auth_tree, auths, &a);
}
struct auth *
auth_insert(struct auth_tree *auths, struct cert *cert, struct auth *parent)
{
struct auth *na;
na = malloc(sizeof(*na));
if (na == NULL)
err(1, NULL);
na->parent = parent;
na->cert = cert;
if (RB_INSERT(auth_tree, auths, na) != NULL)
err(1, "auth tree corrupted");
return na;
}
static void
insert_brk(struct brk_tree *tree, struct cert *cert, int asid)
{
struct brk *b, *found;
if ((b = calloc(1, sizeof(*b))) == NULL)
err(1, NULL);
b->asid = asid;
b->expires = cert->expires;
b->talid = cert->talid;
if ((b->ski = strdup(cert->ski)) == NULL)
err(1, NULL);
if ((b->pubkey = strdup(cert->pubkey)) == NULL)
err(1, NULL);
/*
* Check if a similar BRK already exists in the tree. If the found BRK
* expires sooner, update it to this BRK's later expiry moment.
*/
if ((found = RB_INSERT(brk_tree, tree, b)) != NULL) {
if (found->expires < b->expires) {
found->expires = b->expires;
found->talid = b->talid;
}
free(b->ski);
free(b->pubkey);
free(b);
}
}
/*
* Add each BGPsec Router Key into the BRK tree.
*/
void
cert_insert_brks(struct brk_tree *tree, struct cert *cert)
{
size_t i, asid;
for (i = 0; i < cert->asz; i++) {
switch (cert->as[i].type) {
case CERT_AS_ID:
insert_brk(tree, cert, cert->as[i].id);
break;
case CERT_AS_RANGE:
for (asid = cert->as[i].range.min;
asid <= cert->as[i].range.max; asid++)
insert_brk(tree, cert, asid);
break;
default:
warnx("invalid AS identifier type");
continue;
}
}
}
static inline int
brkcmp(struct brk *a, struct brk *b)
{
int rv;
if (a->asid > b->asid)
return 1;
if (a->asid < b->asid)
return -1;
rv = strcmp(a->ski, b->ski);
if (rv > 0)
return 1;
if (rv < 0)
return -1;
return strcmp(a->pubkey, b->pubkey);
}
RB_GENERATE(brk_tree, brk, entry, brkcmp);
|