random: use Curl_rand() for proper random data

The SASL/Digest previously used the current time's seconds +
microseconds to add randomness but it is much better to instead get more
data from Curl_rand().

It will also allow us to easier "fake" that for debug builds on demand
in a future.

diff --git a/lib/curl_sasl.c b/lib/curl_sasl.c
index 164c329..b0ac9b6 100644 (file)
--- a/lib/curl_sasl.c
+++ b/lib/curl_sasl.c
@@ -423,9 +423,6 @@ CURLcode Curl_sasl_create_digest_md5_message(struct SessionHandle *data,
   unsigned int cnonce2 = 0;
   unsigned int cnonce3 = 0;
   unsigned int cnonce4 = 0;
-#ifndef DEBUGBUILD
-  struct timeval now;
-#endif
 
   char nonceCount[] = "00000001";
   char method[]     = "AUTHENTICATE";
@@ -457,9 +454,8 @@ CURLcode Curl_sasl_create_digest_md5_message(struct SessionHandle *data,
   /* Generate 16 bytes of random data */
   cnonce1 = Curl_rand(data);
   cnonce2 = Curl_rand(data);
-  now = Curl_tvnow();
-  cnonce3 = now.tv_sec;
-  cnonce4 = now.tv_usec;
+  cnonce3 = Curl_rand(data);
+  cnonce4 = Curl_rand(data);
 #endif
 
   /* Convert the random data into a 32 byte hex string */

diff --git a/lib/http_digest.c b/lib/http_digest.c
index ee5d637..55f5108 100644 (file)
--- a/lib/http_digest.c
+++ b/lib/http_digest.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -367,12 +367,9 @@ CURLcode Curl_output_digest(struct connectdata *conn,
     d->nc = 1;
 
   if(!d->cnonce) {
-    struct timeval now = Curl_tvnow();
     snprintf(cnoncebuf, sizeof(cnoncebuf), "%08x%08x%08x%08x",
              Curl_rand(data), Curl_rand(data),
-             (unsigned int)now.tv_sec,
-             (unsigned int)now.tv_usec);
-
+             Curl_rand(data), Curl_rand(data));
     rc = Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf),
                             &cnonce, &cnonce_sz);
     if(rc)