From 85a5cce40dba0393e636c0eb5af9d8f8746f2315 Mon Sep 17 00:00:00 2001
From: Mohit Agrawal <moagrawal@redhat.com>
Date: Thu, 2 Jan 2020 10:23:52 +0530
Subject: [PATCH 497/511] socket: Use AES128 cipher in SSL if AES is supported
 by CPU

SSL performance is improved after configuring AES128 cipher
so use AES128 cipher as a default cipher on the CPU those
enabled AES bits otherwise ssl use AES256 cipher

> Change-Id: I91c50fe987cbb22ed76f8012094730c592c63506
> Fixes: #1050
> Signed-off-by: Mohit Agrawal <moagrawal@redhat.com>
> (Cherry pick from commit 177cc09d24515596eb51739ce0a276c26e3c52f1)
> (Reviewed on upstream link https://review.gluster.org/#/c/glusterfs/+/23952/)

Change-Id: I91c50fe987cbb22ed76f8012094730c592c63506
Bug: 1612973
Signed-off-by: Mohit Agrawal <moagrawal@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/220870
Tested-by: Mohit Agrawal <moagrawa@redhat.com>
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
---
 rpc/rpc-transport/socket/src/socket.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/rpc/rpc-transport/socket/src/socket.c b/rpc/rpc-transport/socket/src/socket.c
index 54cd5df..1ee7320 100644
--- a/rpc/rpc-transport/socket/src/socket.c
+++ b/rpc/rpc-transport/socket/src/socket.c
@@ -4238,6 +4238,34 @@ static void __attribute__((destructor)) fini_openssl_mt(void)
     ERR_free_strings();
 }
 
+/* The function returns 0 if AES bit is enabled on the CPU */
+static int
+ssl_check_aes_bit(void)
+{
+    FILE *fp = fopen("/proc/cpuinfo", "r");
+    int ret = 1;
+    size_t len = 0;
+    char *line = NULL;
+    char *match = NULL;
+
+    GF_ASSERT(fp != NULL);
+
+    while (getline(&line, &len, fp) > 0) {
+        if (!strncmp(line, "flags", 5)) {
+            match = strstr(line, " aes");
+            if ((match != NULL) && ((match[4] == ' ') || (match[4] == 0))) {
+                ret = 0;
+                break;
+            }
+        }
+    }
+
+    free(line);
+    fclose(fp);
+
+    return ret;
+}
+
 static int
 ssl_setup_connection_params(rpc_transport_t *this)
 {
@@ -4261,6 +4289,10 @@ ssl_setup_connection_params(rpc_transport_t *this)
         return 0;
     }
 
+    if (!ssl_check_aes_bit()) {
+        cipher_list = "AES128:" DEFAULT_CIPHER_LIST;
+    }
+
     priv->ssl_own_cert = DEFAULT_CERT_PATH;
     if (dict_get_str(this->options, SSL_OWN_CERT_OPT, &optstr) == 0) {
         if (!priv->ssl_enabled) {
-- 
1.8.3.1