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BUG/MEDIUM: ssl: Prevent ssl error from affecting other connections.

Browse Source 
J. Maurice reported that ssllabs.com test affects unrelated
legitimate traffic and cause SSL errors and broken connections.

Sometimes openssl store read/write/handshake errors in a global stack. This
stack is not specific to the current session. Openssl API does not clean the
stack at the beginning of a new read/write. And the function used to retrieve
error ID after read/write, returns the generic error SSL_ERROR_SSL if the
global stack is not empty.

The fix consists in cleaning the errors stack after read/write/handshake
errors.
This commit is contained in:
Emeric Brun 2012-12-14 11:21:13 +01:00 committed by Willy Tarreau
parent f26b252ee4
commit 644cde05f6
1 changed files with 24 additions and 5 deletions
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29
src/ssl_sock.c
View File

@ -232,6 +232,9 @@ int ssl_sock_load_dh_params(SSL_CTX *ctx, const char *file)
}
ret = 0; /* DH params not found */
/* Clear openssl global errors stack */
ERR_clear_error();
end:
if (dh)
DH_free(dh);
@ -563,6 +566,7 @@ int ssl_sock_prepare_ctx(struct bind_conf *bind_conf, SSL_CTX *ctx, struct proxy
}
}
#endif
ERR_clear_error();
}
if (global.tune.ssllifetime)
@ -1003,6 +1007,9 @@ reneg_ok:
return 1;
out_error:
/* Clear openssl global errors stack */
ERR_clear_error();
/* free resumed session if exists */
if (objt_server(conn->target) && objt_server(conn->target)->ssl_ctx.reused_sess) {
SSL_SESSION_free(objt_server(conn->target)->ssl_ctx.reused_sess);
@ -1058,7 +1065,7 @@ static int ssl_sock_to_buf(struct connection *conn, struct buffer *buf, int coun
ret = SSL_read(conn->xprt_ctx, bi_end(buf), try);
if (conn->flags & CO_FL_ERROR) {
/* CO_FL_ERROR may be set by ssl_sock_infocbk */
break;
goto out_error;
}
if (ret > 0) {
buf->i += ret;
@ -1069,6 +1076,11 @@ static int ssl_sock_to_buf(struct connection *conn, struct buffer *buf, int coun
try = count;
}
else if (ret == 0) {
ret = SSL_get_error(conn->xprt_ctx, ret);
if (ret != SSL_ERROR_ZERO_RETURN) {
/* Clear openssl global errors stack */
ERR_clear_error();
}
goto read0;
}
else {
@ -1100,6 +1112,9 @@ static int ssl_sock_to_buf(struct connection *conn, struct buffer *buf, int coun
conn_sock_read0(conn);
return done;
out_error:
/* Clear openssl global errors stack */
ERR_clear_error();
conn->flags |= CO_FL_ERROR;
return done;
}
@ -1141,7 +1156,7 @@ static int ssl_sock_from_buf(struct connection *conn, struct buffer *buf, int fl
ret = SSL_write(conn->xprt_ctx, bo_ptr(buf), try);
if (conn->flags & CO_FL_ERROR) {
/* CO_FL_ERROR may be set by ssl_sock_infocbk */
break;
goto out_error;
}
if (ret > 0) {
buf->o -= ret;
@ -1180,11 +1195,13 @@ static int ssl_sock_from_buf(struct connection *conn, struct buffer *buf, int fl
return done;
out_error:
/* Clear openssl global errors stack */
ERR_clear_error();
conn->flags |= CO_FL_ERROR;
return done;
}
static void ssl_sock_close(struct connection *conn) {
if (conn->xprt_ctx) {
@ -1202,8 +1219,10 @@ static void ssl_sock_shutw(struct connection *conn, int clean)
if (conn->flags & CO_FL_HANDSHAKE)
return;
/* no handshake was in progress, try a clean ssl shutdown */
if (clean)
SSL_shutdown(conn->xprt_ctx);
if (clean && (SSL_shutdown(conn->xprt_ctx) <= 0)) {
/* Clear openssl global errors stack */
ERR_clear_error();
}
/* force flag on ssl to keep session in cache regardless shutdown result */
SSL_set_shutdown(conn->xprt_ctx, SSL_SENT_SHUTDOWN);