pineapple/externals/libressl/tls/tls_server.c

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2020-12-28 16:15:37 +01:00
/* $OpenBSD: tls_server.c,v 1.45 2019/05/13 22:36:01 bcook 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 <sys/socket.h>
#include <arpa/inet.h>
#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 (tls_init() == -1)
return (NULL);
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;
pthread_mutex_lock(&ctx->config->mutex);
ctx->config->refcount++;
pthread_mutex_unlock(&ctx->config->mutex);
conn_ctx->config = ctx->config;
conn_ctx->keypair = ctx->config->keypair;
return (conn_ctx);
}
static int
tls_server_alpn_cb(SSL *ssl, const unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen, void *arg)
{
struct tls *ctx = arg;
if (SSL_select_next_proto((unsigned char**)out, outlen,
ctx->config->alpn, ctx->config->alpn_len, in, inlen) ==
OPENSSL_NPN_NEGOTIATED)
return (SSL_TLSEXT_ERR_OK);
return (SSL_TLSEXT_ERR_NOACK);
}
static int
tls_servername_cb(SSL *ssl, int *al, void *arg)
{
struct tls *ctx = (struct tls *)arg;
struct tls_sni_ctx *sni_ctx;
union tls_addr addrbuf;
struct tls *conn_ctx;
const char *name;
int match;
if ((conn_ctx = SSL_get_app_data(ssl)) == NULL)
goto err;
if ((name = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name)) ==
NULL) {
/*
* The servername callback gets called even when there is no
* TLS servername extension provided by the client. Sigh!
*/
return (SSL_TLSEXT_ERR_NOACK);
}
/*
* Per RFC 6066 section 3: ensure that name is not an IP literal.
*
* While we should treat this as an error, a number of clients
* (Python, Ruby and Safari) are not RFC compliant. To avoid handshake
* failures, pretend that we did not receive the extension.
*/
if (inet_pton(AF_INET, name, &addrbuf) == 1 ||
inet_pton(AF_INET6, name, &addrbuf) == 1)
return (SSL_TLSEXT_ERR_NOACK);
free((char *)conn_ctx->servername);
if ((conn_ctx->servername = strdup(name)) == NULL)
goto err;
/* Find appropriate SSL context for requested servername. */
for (sni_ctx = ctx->sni_ctx; sni_ctx != NULL; sni_ctx = sni_ctx->next) {
if (tls_check_name(ctx, sni_ctx->ssl_cert, name,
&match) == -1)
goto err;
if (match) {
conn_ctx->keypair = sni_ctx->keypair;
SSL_set_SSL_CTX(conn_ctx->ssl_conn, sni_ctx->ssl_ctx);
return (SSL_TLSEXT_ERR_OK);
}
}
/* No match, use the existing context/certificate. */
return (SSL_TLSEXT_ERR_OK);
err:
/*
* There is no way to tell libssl that an internal failure occurred.
* The only option we have is to return a fatal alert.
*/
*al = TLS1_AD_INTERNAL_ERROR;
return (SSL_TLSEXT_ERR_ALERT_FATAL);
}
static struct tls_ticket_key *
tls_server_ticket_key(struct tls_config *config, unsigned char *keyname)
{
struct tls_ticket_key *key = NULL;
time_t now;
int i;
now = time(NULL);
if (config->ticket_autorekey == 1) {
if (now - 3 * (config->session_lifetime / 4) >
config->ticket_keys[0].time) {
if (tls_config_ticket_autorekey(config) == -1)
return (NULL);
}
}
for (i = 0; i < TLS_NUM_TICKETS; i++) {
struct tls_ticket_key *tk = &config->ticket_keys[i];
if (now - config->session_lifetime > tk->time)
continue;
if (keyname == NULL || timingsafe_memcmp(keyname,
tk->key_name, sizeof(tk->key_name)) == 0) {
key = tk;
break;
}
}
return (key);
}
static int
tls_server_ticket_cb(SSL *ssl, unsigned char *keyname, unsigned char *iv,
EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx, int mode)
{
struct tls_ticket_key *key;
struct tls *tls_ctx;
if ((tls_ctx = SSL_get_app_data(ssl)) == NULL)
return (-1);
if (mode == 1) {
/* create new session */
key = tls_server_ticket_key(tls_ctx->config, NULL);
if (key == NULL) {
tls_set_errorx(tls_ctx, "no valid ticket key found");
return (-1);
}
memcpy(keyname, key->key_name, sizeof(key->key_name));
arc4random_buf(iv, EVP_MAX_IV_LENGTH);
EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
key->aes_key, iv);
HMAC_Init_ex(hctx, key->hmac_key, sizeof(key->hmac_key),
EVP_sha256(), NULL);
return (0);
} else {
/* get key by name */
key = tls_server_ticket_key(tls_ctx->config, keyname);
if (key == NULL)
return (0);
EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
key->aes_key, iv);
HMAC_Init_ex(hctx, key->hmac_key, sizeof(key->hmac_key),
EVP_sha256(), NULL);
/* time to renew the ticket? is it the primary key? */
if (key != &tls_ctx->config->ticket_keys[0])
return (2);
return (1);
}
}
static int
tls_configure_server_ssl(struct tls *ctx, SSL_CTX **ssl_ctx,
struct tls_keypair *keypair)
{
SSL_CTX_free(*ssl_ctx);
if ((*ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
tls_set_errorx(ctx, "ssl context failure");
goto err;
}
SSL_CTX_set_options(*ssl_ctx, SSL_OP_NO_CLIENT_RENEGOTIATION);
if (SSL_CTX_set_tlsext_servername_callback(*ssl_ctx,
tls_servername_cb) != 1) {
tls_set_error(ctx, "failed to set servername callback");
goto err;
}
if (SSL_CTX_set_tlsext_servername_arg(*ssl_ctx, ctx) != 1) {
tls_set_error(ctx, "failed to set servername callback arg");
goto err;
}
if (tls_configure_ssl(ctx, *ssl_ctx) != 0)
goto err;
if (tls_configure_ssl_keypair(ctx, *ssl_ctx, 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, *ssl_ctx, verify) == -1)
goto err;
}
if (ctx->config->alpn != NULL)
SSL_CTX_set_alpn_select_cb(*ssl_ctx, tls_server_alpn_cb,
ctx);
if (ctx->config->dheparams == -1)
SSL_CTX_set_dh_auto(*ssl_ctx, 1);
else if (ctx->config->dheparams == 1024)
SSL_CTX_set_dh_auto(*ssl_ctx, 2);
if (ctx->config->ecdhecurves != NULL) {
SSL_CTX_set_ecdh_auto(*ssl_ctx, 1);
if (SSL_CTX_set1_groups(*ssl_ctx, ctx->config->ecdhecurves,
ctx->config->ecdhecurves_len) != 1) {
tls_set_errorx(ctx, "failed to set ecdhe curves");
goto err;
}
}
if (ctx->config->ciphers_server == 1)
SSL_CTX_set_options(*ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
if (SSL_CTX_set_tlsext_status_cb(*ssl_ctx, tls_ocsp_stapling_cb) != 1) {
tls_set_errorx(ctx, "failed to add OCSP stapling callback");
goto err;
}
if (ctx->config->session_lifetime > 0) {
/* set the session lifetime and enable tickets */
SSL_CTX_set_timeout(*ssl_ctx, ctx->config->session_lifetime);
SSL_CTX_clear_options(*ssl_ctx, SSL_OP_NO_TICKET);
if (!SSL_CTX_set_tlsext_ticket_key_cb(*ssl_ctx,
tls_server_ticket_cb)) {
tls_set_error(ctx,
"failed to set the TLS ticket callback");
goto err;
}
}
if (SSL_CTX_set_session_id_context(*ssl_ctx, ctx->config->session_id,
sizeof(ctx->config->session_id)) != 1) {
tls_set_error(ctx, "failed to set session id context");
goto err;
}
return (0);
err:
SSL_CTX_free(*ssl_ctx);
*ssl_ctx = NULL;
return (-1);
}
static int
tls_configure_server_sni(struct tls *ctx)
{
struct tls_sni_ctx **sni_ctx;
struct tls_keypair *kp;
if (ctx->config->keypair->next == NULL)
return (0);
/* Set up additional SSL contexts for SNI. */
sni_ctx = &ctx->sni_ctx;
for (kp = ctx->config->keypair->next; kp != NULL; kp = kp->next) {
if ((*sni_ctx = tls_sni_ctx_new()) == NULL) {
tls_set_errorx(ctx, "out of memory");
goto err;
}
(*sni_ctx)->keypair = kp;
if (tls_configure_server_ssl(ctx, &(*sni_ctx)->ssl_ctx, kp) == -1)
goto err;
if (tls_keypair_load_cert(kp, &ctx->error,
&(*sni_ctx)->ssl_cert) == -1)
goto err;
sni_ctx = &(*sni_ctx)->next;
}
return (0);
err:
return (-1);
}
int
tls_configure_server(struct tls *ctx)
{
if (tls_configure_server_ssl(ctx, &ctx->ssl_ctx,
ctx->config->keypair) == -1)
goto err;
if (tls_configure_server_sni(ctx) == -1)
goto err;
return (0);
err:
return (-1);
}
static struct tls *
tls_accept_common(struct tls *ctx)
{
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;
}
return conn_ctx;
err:
tls_free(conn_ctx);
return (NULL);
}
int
tls_accept_socket(struct tls *ctx, struct tls **cctx, int s)
{
return (tls_accept_fds(ctx, cctx, s, s));
}
int
tls_accept_fds(struct tls *ctx, struct tls **cctx, int fd_read, int fd_write)
{
struct tls *conn_ctx;
if ((conn_ctx = tls_accept_common(ctx)) == NULL)
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_accept_cbs(struct tls *ctx, struct tls **cctx,
tls_read_cb read_cb, tls_write_cb write_cb, void *cb_arg)
{
struct tls *conn_ctx;
if ((conn_ctx = tls_accept_common(ctx)) == NULL)
goto err;
if (tls_set_cbs(conn_ctx, read_cb, write_cb, cb_arg) != 0)
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;
}
ctx->state |= TLS_SSL_NEEDS_SHUTDOWN;
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);
}