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/* $OpenBSD: tls_server.c,v 1.19 2016/04/28 17:05:59 jsing 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/ec.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <tls.h>
#include "tls_internal.h"
struct tls *
tls_server(void)
{
struct tls *ctx;
if ((ctx = tls_new()) == NULL)
return (NULL);
ctx->flags |= TLS_SERVER;
return (ctx);
}
struct tls *
tls_server_conn(struct tls *ctx)
{
struct tls *conn_ctx;
if ((conn_ctx = tls_new()) == NULL)
return (NULL);
conn_ctx->flags |= TLS_SERVER_CONN;
return (conn_ctx);
}
int
tls_configure_server(struct tls *ctx)
{
EC_KEY *ecdh_key;
unsigned char sid[SSL_MAX_SSL_SESSION_ID_LENGTH];
if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
tls_set_errorx(ctx, "ssl context failure");
goto err;
}
if (tls_configure_ssl(ctx) != 0)
goto err;
if (tls_configure_keypair(ctx, ctx->ssl_ctx, ctx->config->keypair, 1) != 0)
goto err;
if (ctx->config->verify_client != 0) {
int verify = SSL_VERIFY_PEER;
if (ctx->config->verify_client == 1)
verify |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
if (tls_configure_ssl_verify(ctx, verify) == -1)
goto err;
}
if (ctx->config->dheparams == -1)
SSL_CTX_set_dh_auto(ctx->ssl_ctx, 1);
else if (ctx->config->dheparams == 1024)
SSL_CTX_set_dh_auto(ctx->ssl_ctx, 2);
if (ctx->config->ecdhecurve == -1) {
SSL_CTX_set_ecdh_auto(ctx->ssl_ctx, 1);
} else if (ctx->config->ecdhecurve != NID_undef) {
if ((ecdh_key = EC_KEY_new_by_curve_name(
ctx->config->ecdhecurve)) == NULL) {
tls_set_errorx(ctx, "failed to set ECDHE curve");
goto err;
}
SSL_CTX_set_options(ctx->ssl_ctx, SSL_OP_SINGLE_ECDH_USE);
SSL_CTX_set_tmp_ecdh(ctx->ssl_ctx, ecdh_key);
EC_KEY_free(ecdh_key);
}
if (ctx->config->ciphers_server == 1)
SSL_CTX_set_options(ctx->ssl_ctx,
SSL_OP_CIPHER_SERVER_PREFERENCE);
/*
* Set session ID context to a random value. We don't support
* persistent caching of sessions so it is OK to set a temporary
* session ID context that is valid during run time.
*/
arc4random_buf(sid, sizeof(sid));
if (!SSL_CTX_set_session_id_context(ctx->ssl_ctx, sid, sizeof(sid))) {
tls_set_errorx(ctx, "failed to set session id context");
goto err;
}
return (0);
err:
return (-1);
}
int
tls_accept_socket(struct tls *ctx, struct tls **cctx, int socket)
{
return (tls_accept_fds(ctx, cctx, socket, socket));
}
int
tls_accept_fds(struct tls *ctx, struct tls **cctx, int fd_read, int fd_write)
{
struct tls *conn_ctx = NULL;
if ((ctx->flags & TLS_SERVER) == 0) {
tls_set_errorx(ctx, "not a server context");
goto err;
}
if ((conn_ctx = tls_server_conn(ctx)) == NULL) {
tls_set_errorx(ctx, "connection context failure");
goto err;
}
if ((conn_ctx->ssl_conn = SSL_new(ctx->ssl_ctx)) == NULL) {
tls_set_errorx(ctx, "ssl failure");
goto err;
}
if (SSL_set_app_data(conn_ctx->ssl_conn, conn_ctx) != 1) {
tls_set_errorx(ctx, "ssl application data failure");
goto err;
}
if (SSL_set_rfd(conn_ctx->ssl_conn, fd_read) != 1 ||
SSL_set_wfd(conn_ctx->ssl_conn, fd_write) != 1) {
tls_set_errorx(ctx, "ssl file descriptor failure");
goto err;
}
*cctx = conn_ctx;
return (0);
err:
tls_free(conn_ctx);
*cctx = NULL;
return (-1);
}
int
tls_handshake_server(struct tls *ctx)
{
int ssl_ret;
int rv = -1;
if ((ctx->flags & TLS_SERVER_CONN) == 0) {
tls_set_errorx(ctx, "not a server connection context");
goto err;
}
ERR_clear_error();
if ((ssl_ret = SSL_accept(ctx->ssl_conn)) != 1) {
rv = tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, "handshake");
goto err;
}
ctx->state |= TLS_HANDSHAKE_COMPLETE;
rv = 0;
err:
return (rv);
}
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