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MEDIUM: ssl: protect against client-initiated renegociation

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CVE-2009-3555 suggests that client-initiated renegociation should be
prevented in the middle of data. The workaround here consists in having
the SSL layer notify our callback about a handshake occurring, which in
turn causes the connection to be marked in the error state if it was
already considered established (which means if a previous handshake was
completed). The result is that the connection with the client is immediately
aborted and any pending data are dropped.
This commit is contained in:
Emeric Brun 2012-09-03 20:36:47 +02:00 committed by Willy Tarreau
parent 01f8e2f61b
commit e1f38dbb44
3 changed files with 26 additions and 1 deletions
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1
include/proto/ssl_sock.h
View File

@ -26,6 +26,7 @@
extern struct data_ops ssl_sock;
int ssl_sock_handshake(struct connection *conn, unsigned int flag);
void ssl_sock_infocbk(const SSL *ssl, int where, int ret);
#endif /* _PROTO_SSL_SOCK_H */

1
src/cfgparse.c
View File

@ -6704,6 +6704,7 @@ int check_config_validity()
SSL_CTX_set_mode(listener->ssl_ctx.ctx, sslmode);
SSL_CTX_set_verify(listener->ssl_ctx.ctx, SSL_VERIFY_NONE, NULL);
SSL_CTX_set_session_cache_mode(listener->ssl_ctx.ctx, SSL_SESS_CACHE_SERVER);
SSL_CTX_set_info_callback(listener->ssl_ctx.ctx, ssl_sock_infocbk);
if (SSL_CTX_use_PrivateKey_file(listener->ssl_ctx.ctx, listener->ssl_cert, SSL_FILETYPE_PEM) <= 0) {
Alert("Proxy '%s': unable to load SSL private key from file '%s' in listener %d (%s:%d).\n",

25
src/ssl_sock.c
View File

@ -44,6 +44,19 @@
#include <types/global.h>
void ssl_sock_infocbk(const SSL *ssl, int where, int ret)
{
struct connection *conn = (struct connection *)SSL_get_app_data(ssl);
(void)ret; /* shut gcc stupid warning */
if (where & SSL_CB_HANDSHAKE_START) {
/* Disable renegotiation (CVE-2009-3555) */
if (conn->flags & CO_FL_CONNECTED)
conn->flags |= CO_FL_ERROR;
}
}
/*
* This function is called if SSL * context is not yet allocated. The function
* is designed to be called before any other data-layer operation and sets the
@ -88,6 +101,9 @@ static int ssl_sock_init(struct connection *conn)
/* set fd on SSL session context */
SSL_set_fd(conn->data_ctx, conn->t.sock.fd);
/* set connection pointer */
SSL_set_app_data(conn->data_ctx, conn);
/* leave init state and start handshake */
conn->flags |= CO_FL_SSL_WAIT_HS;
return 0;
@ -197,7 +213,10 @@ static int ssl_sock_to_buf(struct connection *conn, struct buffer *buf, int coun
*/
while (try) {
ret = SSL_read(conn->data_ctx, bi_end(buf), try);
if (conn->flags & CO_FL_ERROR) {
/* CO_FL_ERROR may be set by ssl_sock_infocbk */
break;
}
if (ret > 0) {
buf->i += ret;
done += ret;
@ -271,6 +290,10 @@ static int ssl_sock_from_buf(struct connection *conn, struct buffer *buf, int fl
try = buf->data + try - buf->p;
ret = SSL_write(conn->data_ctx, bo_ptr(buf), try);
if (conn->flags & CO_FL_ERROR) {
/* CO_FL_ERROR may be set by ssl_sock_infocbk */
break;
}
if (ret > 0) {
buf->o -= ret;
done += ret;