Security-55471.tar.gz

[apple/security.git] / libsecurity_ssl / lib / sslRand.c

diff --git a/libsecurity_ssl/lib/sslRand.c b/libsecurity_ssl/lib/sslRand.c
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+++ b/libsecurity_ssl/lib/sslRand.c
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+/*
+ * Copyright (c) 1999-2001,2005-2008,2010-2011 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/*
+ * sslRand.c - Randomness
+ */
+
+/* THIS FILE CONTAINS KERNEL CODE */
+
+#include "sslRand.h"
+#include "sslDebug.h"
+#include <AssertMacros.h>
+
+#ifdef KERNEL
+
+void read_random(void* buffer, u_int numBytes);
+
+#else
+
+#include <TargetConditionals.h>
+
+#ifdef TARGET_OS_EMBEDDED
+#include <Security/SecRandom.h>
+#else
+static
+int sslRandMacOSX(void *data, size_t len)
+{
+    static int random_fd = -1;
+
+    if (random_fd == -1) {
+        random_fd = open("/dev/random", O_RDONLY);
+        if (random_fd == -1) {
+            sslErrorLog("sslRand: error opening /dev/random: %s\n",
+                        strerror(errno));
+            return -1;
+        }
+    }
+
+    ssize_t bytesRead = read(random_fd, data, len);
+    if (bytesRead != len) {
+        sslErrorLog("sslRand: error reading %lu bytes from /dev/random: %s\n",
+                    len, strerror(errno));
+        serr = -1;
+    }
+
+    return serr;
+}
+#endif /* TARGET_OS_EMBEDDED */
+
+#endif /* KERNEL */
+
+/*
+ * Common RNG function.
+ */
+int sslRand(SSLBuffer *buf)
+{
+       check(buf != NULL);
+       check(buf->data != NULL);
+
+       if(buf->length == 0) {
+               sslErrorLog("sslRand: zero buf->length\n");
+               return 0;
+       }
+
+#ifdef KERNEL
+    read_random(buf->data, (u_int)buf->length);
+    return 0;
+#else
+#ifdef TARGET_OS_EMBEDDED
+       return SecRandomCopyBytes(kSecRandomDefault, buf->length, buf->data);
+#else
+    return sslRandMacOSX(ctx, buf);
+#endif
+#endif
+}