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/*
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include "brssl.h"
static void
dn_append(void *ctx, const void *buf, size_t len)
{
VEC_ADDMANY(*(bvector *)ctx, buf, len);
}
static int
certificate_to_trust_anchor_inner(br_x509_trust_anchor *ta,
br_x509_certificate *xc)
{
br_x509_decoder_context dc;
bvector vdn = VEC_INIT;
br_x509_pkey *pk;
br_x509_decoder_init(&dc, dn_append, &vdn);
br_x509_decoder_push(&dc, xc->data, xc->data_len);
pk = br_x509_decoder_get_pkey(&dc);
if (pk == NULL) {
fprintf(stderr, "ERROR: CA decoding failed with error %d\n",
br_x509_decoder_last_error(&dc));
VEC_CLEAR(vdn);
return -1;
}
ta->dn.data = VEC_TOARRAY(vdn);
ta->dn.len = VEC_LEN(vdn);
VEC_CLEAR(vdn);
ta->flags = 0;
if (br_x509_decoder_isCA(&dc)) {
ta->flags |= BR_X509_TA_CA;
}
switch (pk->key_type) {
case BR_KEYTYPE_RSA:
ta->pkey.key_type = BR_KEYTYPE_RSA;
ta->pkey.key.rsa.n = xblobdup(pk->key.rsa.n, pk->key.rsa.nlen);
ta->pkey.key.rsa.nlen = pk->key.rsa.nlen;
ta->pkey.key.rsa.e = xblobdup(pk->key.rsa.e, pk->key.rsa.elen);
ta->pkey.key.rsa.elen = pk->key.rsa.elen;
break;
case BR_KEYTYPE_EC:
ta->pkey.key_type = BR_KEYTYPE_EC;
ta->pkey.key.ec.curve = pk->key.ec.curve;
ta->pkey.key.ec.q = xblobdup(pk->key.ec.q, pk->key.ec.qlen);
ta->pkey.key.ec.qlen = pk->key.ec.qlen;
break;
default:
fprintf(stderr, "ERROR: unsupported public key type in CA\n");
xfree(ta->dn.data);
return -1;
}
return 0;
}
/* see brssl.h */
br_x509_trust_anchor *
certificate_to_trust_anchor(br_x509_certificate *xc)
{
br_x509_trust_anchor ta;
if (certificate_to_trust_anchor_inner(&ta, xc) < 0) {
return NULL;
} else {
return xblobdup(&ta, sizeof ta);
}
}
/* see brssl.h */
void
free_ta_contents(br_x509_trust_anchor *ta)
{
xfree(ta->dn.data);
switch (ta->pkey.key_type) {
case BR_KEYTYPE_RSA:
xfree(ta->pkey.key.rsa.n);
xfree(ta->pkey.key.rsa.e);
break;
case BR_KEYTYPE_EC:
xfree(ta->pkey.key.ec.q);
break;
}
}
/* see brssl.h */
size_t
read_trust_anchors(anchor_list *dst, const char *fname)
{
br_x509_certificate *xcs;
anchor_list tas = VEC_INIT;
size_t u, num;
xcs = read_certificates(fname, &num);
if (xcs == NULL) {
return 0;
}
for (u = 0; u < num; u ++) {
br_x509_trust_anchor ta;
if (certificate_to_trust_anchor_inner(&ta, &xcs[u]) < 0) {
VEC_CLEAREXT(tas, free_ta_contents);
free_certificates(xcs, num);
return 0;
}
VEC_ADD(tas, ta);
}
VEC_ADDMANY(*dst, &VEC_ELT(tas, 0), num);
VEC_CLEAR(tas);
free_certificates(xcs, num);
return num;
}
/* see brssl.h */
int
get_cert_signer_algo(br_x509_certificate *xc)
{
br_x509_decoder_context dc;
int err;
br_x509_decoder_init(&dc, 0, 0);
br_x509_decoder_push(&dc, xc->data, xc->data_len);
err = br_x509_decoder_last_error(&dc);
if (err != 0) {
fprintf(stderr,
"ERROR: certificate decoding failed with error %d\n",
-err);
return 0;
}
return br_x509_decoder_get_signer_key_type(&dc);
}
static void
xwc_start_chain(const br_x509_class **ctx, const char *server_name)
{
x509_noanchor_context *xwc;
xwc = (x509_noanchor_context *)ctx;
(*xwc->inner)->start_chain(xwc->inner, server_name);
}
static void
xwc_start_cert(const br_x509_class **ctx, uint32_t length)
{
x509_noanchor_context *xwc;
xwc = (x509_noanchor_context *)ctx;
(*xwc->inner)->start_cert(xwc->inner, length);
}
static void
xwc_append(const br_x509_class **ctx, const unsigned char *buf, size_t len)
{
x509_noanchor_context *xwc;
xwc = (x509_noanchor_context *)ctx;
(*xwc->inner)->append(xwc->inner, buf, len);
}
static void
xwc_end_cert(const br_x509_class **ctx)
{
x509_noanchor_context *xwc;
xwc = (x509_noanchor_context *)ctx;
(*xwc->inner)->end_cert(xwc->inner);
}
static unsigned
xwc_end_chain(const br_x509_class **ctx)
{
x509_noanchor_context *xwc;
unsigned r;
xwc = (x509_noanchor_context *)ctx;
r = (*xwc->inner)->end_chain(xwc->inner);
if (r == BR_ERR_X509_NOT_TRUSTED) {
r = 0;
}
return r;
}
static const br_x509_pkey *
xwc_get_pkey(const br_x509_class *const *ctx, unsigned *usages)
{
x509_noanchor_context *xwc;
xwc = (x509_noanchor_context *)ctx;
return (*xwc->inner)->get_pkey(xwc->inner, usages);
}
/* see brssl.h */
const br_x509_class x509_noanchor_vtable = {
sizeof(x509_noanchor_context),
xwc_start_chain,
xwc_start_cert,
xwc_append,
xwc_end_cert,
xwc_end_chain,
xwc_get_pkey
};
/* see brssl.h */
void
x509_noanchor_init(x509_noanchor_context *xwc, const br_x509_class **inner)
{
xwc->vtable = &x509_noanchor_vtable;
xwc->inner = inner;
}
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