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Add error code support to libtls

This adds tls_config_error_code() and tls_error_code(), which will become
public API at a later date.

Additional error codes will be added in follow-up commits.

ok jsing@ beck@

/* $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);
}