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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2012-2014 Baptiste Daroussin <bapt@FreeBSD.org>
* Copyright (c) 2013 Bryan Drewery <bdrewery@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <err.h>
#include <stdbool.h>
#include <string.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include "pkg.h"
#include "config.h"
#include "hash.h"
static EVP_PKEY *
load_public_key_file(const char *file)
{
EVP_PKEY *pkey;
BIO *bp;
char errbuf[1024];
bp = BIO_new_file(file, "r");
if (!bp)
errx(EXIT_FAILURE, "Unable to read %s", file);
if ((pkey = PEM_read_bio_PUBKEY(bp, NULL, NULL, NULL)) == NULL)
warnx("ici: %s", ERR_error_string(ERR_get_error(), errbuf));
BIO_free(bp);
return (pkey);
}
static EVP_PKEY *
load_public_key_buf(const unsigned char *cert, int certlen)
{
EVP_PKEY *pkey;
BIO *bp;
char errbuf[1024];
bp = BIO_new_mem_buf(__DECONST(void *, cert), certlen);
if ((pkey = PEM_read_bio_PUBKEY(bp, NULL, NULL, NULL)) == NULL)
warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
BIO_free(bp);
return (pkey);
}
static bool
rsa_verify_data(const struct pkgsign_ctx *ctx __unused,
const char *data, size_t datasz, const char *sigfile,
const unsigned char *key, int keylen, unsigned char *sig, int siglen)
{
EVP_MD_CTX *mdctx;
EVP_PKEY *pkey;
char errbuf[1024];
bool ret;
pkey = NULL;
mdctx = NULL;
ret = false;
SSL_load_error_strings();
if (sigfile != NULL) {
if ((pkey = load_public_key_file(sigfile)) == NULL) {
warnx("Error reading public key");
goto cleanup;
}
} else {
if ((pkey = load_public_key_buf(key, keylen)) == NULL) {
warnx("Error reading public key");
goto cleanup;
}
}
/* Verify signature of the SHA256(pkg) is valid. */
if ((mdctx = EVP_MD_CTX_create()) == NULL) {
warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
goto error;
}
if (EVP_DigestVerifyInit(mdctx, NULL, EVP_sha256(), NULL, pkey) != 1) {
warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
goto error;
}
if (EVP_DigestVerifyUpdate(mdctx, data, datasz) != 1) {
warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
goto error;
}
if (EVP_DigestVerifyFinal(mdctx, sig, siglen) != 1) {
warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
goto error;
}
ret = true;
printf("done\n");
goto cleanup;
error:
printf("failed\n");
cleanup:
if (pkey)
EVP_PKEY_free(pkey);
if (mdctx)
EVP_MD_CTX_destroy(mdctx);
ERR_free_strings();
return (ret);
}
static bool
rsa_verify_cert(const struct pkgsign_ctx *ctx __unused, int fd,
const char *sigfile, const unsigned char *key, int keylen,
unsigned char *sig, int siglen)
{
char *sha256;
bool ret;
sha256 = NULL;
/* Compute SHA256 of the package. */
if (lseek(fd, 0, 0) == -1) {
warn("lseek");
return (false);
}
if ((sha256 = sha256_fd(fd)) == NULL) {
warnx("Error creating SHA256 hash for package");
return (false);
}
ret = rsa_verify_data(ctx, sha256, strlen(sha256), sigfile, key, keylen,
sig, siglen);
free(sha256);
return (ret);
}
const struct pkgsign_ops pkgsign_rsa = {
.pkgsign_verify_cert = rsa_verify_cert,
.pkgsign_verify_data = rsa_verify_data,
};
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