/* $OpenBSD: tls_keypair.c,v 1.9 2024/03/26 06:24:52 joshua Exp $ */
/*
 * Copyright (c) 2014 Joel Sing <jsing@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 <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/pem.h>

#include <tls.h>

#include "tls_internal.h"

struct tls_keypair *
tls_keypair_new(void)
{
        return calloc(1, sizeof(struct tls_keypair));
}

static int
tls_keypair_pubkey_hash(struct tls_keypair *keypair, struct tls_error *error)
{
        X509 *cert = NULL;
        int rv = -1;

        free(keypair->pubkey_hash);
        keypair->pubkey_hash = NULL;

        if (keypair->cert_mem == NULL) {
                rv = 0;
                goto done;
        }

        if (tls_keypair_load_cert(keypair, error, &cert) == -1)
                goto err;
        if (tls_cert_pubkey_hash(cert, &keypair->pubkey_hash) == -1)
                goto err;

        rv = 0;

 err:
        X509_free(cert);
 done:
        return (rv);
}

void
tls_keypair_clear_key(struct tls_keypair *keypair)
{
        freezero(keypair->key_mem, keypair->key_len);
        keypair->key_mem = NULL;
        keypair->key_len = 0;
}

int
tls_keypair_set_cert_file(struct tls_keypair *keypair, struct tls_error *error,
    const char *cert_file)
{
        if (tls_config_load_file(error, "certificate", cert_file,
            &keypair->cert_mem, &keypair->cert_len) == -1)
                return -1;
        return tls_keypair_pubkey_hash(keypair, error);
}

int
tls_keypair_set_cert_mem(struct tls_keypair *keypair, struct tls_error *error,
    const uint8_t *cert, size_t len)
{
        if (tls_set_mem(&keypair->cert_mem, &keypair->cert_len, cert, len) == -1)
                return -1;
        return tls_keypair_pubkey_hash(keypair, error);
}

int
tls_keypair_set_key_file(struct tls_keypair *keypair, struct tls_error *error,
    const char *key_file)
{
        tls_keypair_clear_key(keypair);
        return tls_config_load_file(error, "key", key_file,
            &keypair->key_mem, &keypair->key_len);
}

int
tls_keypair_set_key_mem(struct tls_keypair *keypair, struct tls_error *error,
    const uint8_t *key, size_t len)
{
        tls_keypair_clear_key(keypair);
        return tls_set_mem(&keypair->key_mem, &keypair->key_len, key, len);
}

int
tls_keypair_set_ocsp_staple_file(struct tls_keypair *keypair,
    struct tls_error *error, const char *ocsp_file)
{
        return tls_config_load_file(error, "ocsp", ocsp_file,
            &keypair->ocsp_staple, &keypair->ocsp_staple_len);
}

int
tls_keypair_set_ocsp_staple_mem(struct tls_keypair *keypair,
    struct tls_error *error, const uint8_t *staple, size_t len)
{
        return tls_set_mem(&keypair->ocsp_staple, &keypair->ocsp_staple_len,
            staple, len);
}

void
tls_keypair_free(struct tls_keypair *keypair)
{
        if (keypair == NULL)
                return;

        tls_keypair_clear_key(keypair);

        free(keypair->cert_mem);
        free(keypair->ocsp_staple);
        free(keypair->pubkey_hash);

        free(keypair);
}

int
tls_keypair_load_cert(struct tls_keypair *keypair, struct tls_error *error,
    X509 **cert)
{
        char *errstr = "unknown";
        BIO *cert_bio = NULL;
        unsigned long ssl_err;
        int rv = -1;

        X509_free(*cert);
        *cert = NULL;

        if (keypair->cert_mem == NULL) {
                tls_error_set(error, TLS_ERROR_UNKNOWN,
                    "keypair has no certificate");
                goto err;
        }
        if ((cert_bio = BIO_new_mem_buf(keypair->cert_mem,
            keypair->cert_len)) == NULL) {
                tls_error_set(error, TLS_ERROR_UNKNOWN,
                    "failed to create certificate bio");
                goto err;
        }
        if ((*cert = PEM_read_bio_X509(cert_bio, NULL, tls_password_cb,
            NULL)) == NULL) {
                if ((ssl_err = ERR_peek_error()) != 0)
                        errstr = ERR_error_string(ssl_err, NULL);
                tls_error_set(error, TLS_ERROR_UNKNOWN,
                    "failed to load certificate: %s", errstr);
                goto err;
        }

        rv = 0;

 err:
        BIO_free(cert_bio);

        return (rv);
}