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OpenSSL: Enable support for server side TLS session resumption

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This allows TLS-based EAP server methods to use session resumption.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-08-23 22:08:27 +03:00
parent 7f417feaa1
commit acf36f319f
1 changed files with 115 additions and 13 deletions
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114
src/crypto/tls_openssl.c
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@ -74,6 +74,7 @@ static BIO * BIO_from_keystore(const char *key)
#endif /* ANDROID */
static int tls_openssl_ref_count = 0;
static int tls_ex_idx_session = -1;
struct tls_context {
void (*event_cb)(void *ctx, enum tls_event ev,
@ -88,6 +89,7 @@ static struct tls_context *tls_global = NULL;
struct tls_data {
SSL_CTX *ssl;
unsigned int tls_session_lifetime;
};
struct tls_connection {
@ -113,6 +115,7 @@ struct tls_connection {
unsigned int cert_probe:1;
unsigned int server_cert_only:1;
unsigned int invalid_hb_used:1;
unsigned int success_data:1;
u8 srv_cert_hash[32];
@ -748,6 +751,24 @@ static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
#endif /* OPENSSL_NO_ENGINE */
static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess)
{
struct wpabuf *buf;
if (tls_ex_idx_session < 0)
return;
buf = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
if (!buf)
return;
wpa_printf(MSG_DEBUG,
"OpenSSL: Free application session data %p (sess %p)",
buf, sess);
wpabuf_free(buf);
SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL);
}
void * tls_init(const struct tls_config *conf)
{
struct tls_data *data;
@ -831,12 +852,36 @@ void * tls_init(const struct tls_config *conf)
return NULL;
}
data->ssl = ssl;
if (conf)
data->tls_session_lifetime = conf->tls_session_lifetime;
SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2);
SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3);
SSL_CTX_set_info_callback(ssl, ssl_info_cb);
SSL_CTX_set_app_data(ssl, context);
if (data->tls_session_lifetime > 0) {
SSL_CTX_set_quiet_shutdown(ssl, 1);
/*
* Set default context here. In practice, this will be replaced
* by the per-EAP method context in tls_connection_set_verify().
*/
SSL_CTX_set_session_id_context(ssl, (u8 *) "hostapd", 7);
SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_SERVER);
SSL_CTX_set_timeout(ssl, data->tls_session_lifetime);
SSL_CTX_sess_set_remove_cb(ssl, remove_session_cb);
} else {
SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_OFF);
}
if (tls_ex_idx_session < 0) {
tls_ex_idx_session = SSL_SESSION_get_ex_new_index(
0, NULL, NULL, NULL, NULL);
if (tls_ex_idx_session < 0) {
tls_deinit(data);
return NULL;
}
}
#ifndef OPENSSL_NO_ENGINE
wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
@ -878,6 +923,8 @@ void tls_deinit(void *ssl_ctx)
struct tls_context *context = SSL_CTX_get_app_data(ssl);
if (context != tls_global)
os_free(context);
if (data->tls_session_lifetime > 0)
SSL_CTX_flush_sessions(ssl, 0);
SSL_CTX_free(ssl);
tls_openssl_ref_count--;
@ -1129,6 +1176,14 @@ void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
{
if (conn == NULL)
return;
if (conn->success_data) {
/*
* Make sure ssl_clear_bad_session() does not remove this
* session.
*/
SSL_set_quiet_shutdown(conn->ssl, 1);
SSL_shutdown(conn->ssl);
}
SSL_free(conn->ssl);
tls_engine_deinit(conn);
os_free(conn->subject_match);
@ -1980,6 +2035,7 @@ int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
const u8 *session_ctx, size_t session_ctx_len)
{
static int counter = 0;
struct tls_data *data = ssl_ctx;
if (conn == NULL)
return -1;
@ -1999,18 +2055,20 @@ int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
SSL_set_accept_state(conn->ssl);
if (data->tls_session_lifetime == 0) {
/*
* Set session id context in order to avoid fatal errors when client
* tries to resume a session. However, set the context to a unique
* value in order to effectively disable session resumption for now
* since not all areas of the server code are ready for it (e.g.,
* EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
* handshake).
* Set session id context to a unique value to make sure
* session resumption cannot be used either through session
* caching or TLS ticket extension.
*/
counter++;
SSL_set_session_id_context(conn->ssl,
(const unsigned char *) &counter,
sizeof(counter));
} else if (session_ctx) {
SSL_set_session_id_context(conn->ssl, session_ctx,
session_ctx_len);
}
return 0;
}
@ -4018,21 +4076,65 @@ int tls_get_library_version(char *buf, size_t buf_len)
void tls_connection_set_success_data(struct tls_connection *conn,
struct wpabuf *data)
{
SSL_SESSION *sess;
struct wpabuf *old;
if (tls_ex_idx_session < 0)
goto fail;
sess = SSL_get_session(conn->ssl);
if (!sess)
goto fail;
old = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
if (old) {
wpa_printf(MSG_DEBUG, "OpenSSL: Replacing old success data %p",
old);
wpabuf_free(old);
}
if (SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1)
goto fail;
wpa_printf(MSG_DEBUG, "OpenSSL: Stored success data %p", data);
conn->success_data = 1;
return;
fail:
wpa_printf(MSG_INFO, "OpenSSL: Failed to store success data");
wpabuf_free(data);
}
void tls_connection_set_success_data_resumed(struct tls_connection *conn)
{
wpa_printf(MSG_DEBUG,
"OpenSSL: Success data accepted for resumed session");
conn->success_data = 1;
}
const struct wpabuf *
tls_connection_get_success_data(struct tls_connection *conn)
{
SSL_SESSION *sess;
if (tls_ex_idx_session < 0 ||
!(sess = SSL_get_session(conn->ssl)))
return NULL;
return SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
}
void tls_connection_remove_session(struct tls_connection *conn)
{
SSL_SESSION *sess;
sess = SSL_get_session(conn->ssl);
if (!sess)
return;
if (SSL_CTX_remove_session(conn->ssl_ctx, sess) != 1)
wpa_printf(MSG_DEBUG,
"OpenSSL: Session was not cached");
else
wpa_printf(MSG_DEBUG,
"OpenSSL: Removed cached session to disable session resumption");
}