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/* $OpenBSD: gbr.c,v 1.11 2021/10/26 10:52:50 claudio Exp $ */
/*
* Copyright (c) 2020 Claudio Jeker <claudio@openbsd.org>
*
* 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 <assert.h>
#include <err.h>
#include <stdarg.h>
#include <stdint.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openssl/x509.h>
#include "extern.h"
/*
* Parse results and data of the manifest file.
*/
struct parse {
const char *fn; /* manifest file name */
struct gbr *res; /* results */
};
static ASN1_OBJECT *gbr_oid;
/*
* Parse a full RFC 6493 file and signed by the certificate "cacert"
* (the latter is optional and may be passed as NULL to disable).
* Returns the payload or NULL if the document was malformed.
*/
struct gbr *
gbr_parse(X509 **x509, const char *fn, const unsigned char *der, size_t len)
{
struct parse p;
size_t cmsz;
unsigned char *cms;
memset(&p, 0, sizeof(struct parse));
p.fn = fn;
/* OID from section 9.1, RFC 6493. */
if (gbr_oid == NULL) {
gbr_oid = OBJ_txt2obj("1.2.840.113549.1.9.16.1.35", 1);
if (gbr_oid == NULL)
errx(1, "OBJ_txt2obj for %s failed",
"1.2.840.113549.1.9.16.1.35");
}
cms = cms_parse_validate(x509, fn, der, len, gbr_oid, &cmsz);
if (cms == NULL)
return NULL;
if ((p.res = calloc(1, sizeof(*p.res))) == NULL)
err(1, NULL);
if ((p.res->vcard = strndup(cms, cmsz)) == NULL)
err(1, NULL);
free(cms);
p.res->aia = x509_get_aia(*x509, fn);
p.res->aki = x509_get_aki(*x509, 0, fn);
p.res->ski = x509_get_ski(*x509, fn);
if (p.res->aia == NULL || p.res->aki == NULL || p.res->ski == NULL) {
warnx("%s: RFC 6487 section 4.8: "
"missing AIA, AKI or SKI X509 extension", fn);
gbr_free(p.res);
X509_free(*x509);
*x509 = NULL;
return NULL;
}
return p.res;
}
/*
* Free a GBR pointer.
* Safe to call with NULL.
*/
void
gbr_free(struct gbr *p)
{
if (p == NULL)
return;
free(p->aia);
free(p->aki);
free(p->ski);
free(p->vcard);
free(p);
}
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