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101 lines
3.0 KiB
101 lines
3.0 KiB
From 60d7aeb6e1450995e721d01f48f60b7db4c44e2b Mon Sep 17 00:00:00 2001
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From: Remi Gacogne <rgacogne[at]aquaray[dot]fr>
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Date: Tue, 15 Jul 2014 11:36:40 +0200
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Subject: [PATCH 3/3] BUG/MEDIUM: ssl: Fix a memory leak in DHE key exchange
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OpenSSL does not free the DH * value returned by the callback specified with SSL_CTX_set_tmp_dh_callback(),
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leading to a memory leak for SSL/TLS connections using Diffie Hellman Ephemeral key exchange.
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This patch fixes the leak by allocating the DH * structs holding the DH parameters once, at configuration time.
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Note: this fix must be backported to 1.5.
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(cherry picked from commit 8de5415b85512da871d58d1e9a0a33bd67f3b570)
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---
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src/ssl_sock.c | 43 ++++++++++++++++++++++++++++++++++++-------
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1 file changed, 36 insertions(+), 7 deletions(-)
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diff --git a/src/ssl_sock.c b/src/ssl_sock.c
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index 375225d..cf8adc7 100644
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--- a/src/ssl_sock.c
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+++ b/src/ssl_sock.c
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@@ -105,6 +105,13 @@ enum {
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int sslconns = 0;
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int totalsslconns = 0;
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+#ifndef OPENSSL_NO_DH
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+static DH *local_dh_1024 = NULL;
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+static DH *local_dh_2048 = NULL;
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+static DH *local_dh_4096 = NULL;
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+static DH *local_dh_8192 = NULL;
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+#endif /* OPENSSL_NO_DH */
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+
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#ifdef SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB
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struct certificate_ocsp {
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struct ebmb_node key;
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@@ -1034,16 +1041,16 @@ static DH *ssl_get_tmp_dh(SSL *ssl, int export, int keylen)
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}
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if (keylen >= 8192) {
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- dh = ssl_get_dh_8192();
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+ dh = local_dh_8192;
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}
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else if (keylen >= 4096) {
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- dh = ssl_get_dh_4096();
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+ dh = local_dh_4096;
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}
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else if (keylen >= 2048) {
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- dh = ssl_get_dh_2048();
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+ dh = local_dh_2048;
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}
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else {
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- dh = ssl_get_dh_1024();
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+ dh = local_dh_1024;
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}
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return dh;
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@@ -1079,11 +1086,11 @@ int ssl_sock_load_dh_params(SSL_CTX *ctx, const char *file)
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if (global.tune.ssl_default_dh_param <= 1024) {
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/* we are limited to DH parameter of 1024 bits anyway */
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- dh = ssl_get_dh_1024();
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- if (dh == NULL)
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+ local_dh_1024 = ssl_get_dh_1024();
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+ if (local_dh_1024 == NULL)
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goto end;
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- SSL_CTX_set_tmp_dh(ctx, dh);
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+ SSL_CTX_set_tmp_dh(ctx, local_dh_1024);
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}
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else {
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SSL_CTX_set_tmp_dh_callback(ctx, ssl_get_tmp_dh);
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@@ -1594,6 +1601,28 @@ int ssl_sock_prepare_ctx(struct bind_conf *bind_conf, SSL_CTX *ctx, struct proxy
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global.tune.ssl_default_dh_param = 1024;
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}
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+#ifndef OPENSSL_NO_DH
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+ if (global.tune.ssl_default_dh_param >= 1024) {
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+ if (local_dh_1024 == NULL) {
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+ local_dh_1024 = ssl_get_dh_1024();
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+ }
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+ if (global.tune.ssl_default_dh_param >= 2048) {
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+ if (local_dh_2048 == NULL) {
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+ local_dh_2048 = ssl_get_dh_2048();
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+ }
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+ if (global.tune.ssl_default_dh_param >= 4096) {
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+ if (local_dh_4096 == NULL) {
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+ local_dh_4096 = ssl_get_dh_4096();
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+ }
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+ if (global.tune.ssl_default_dh_param >= 8192 &&
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+ local_dh_8192 == NULL) {
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+ local_dh_8192 = ssl_get_dh_8192();
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+ }
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+ }
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+ }
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+ }
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+#endif /* OPENSSL_NO_DH */
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+
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SSL_CTX_set_info_callback(ctx, ssl_sock_infocbk);
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#if OPENSSL_VERSION_NUMBER >= 0x00907000L
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SSL_CTX_set_msg_callback(ctx, ssl_sock_msgcbk);
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--
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1.8.5.5
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