Security-55163.44.tar.gz

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

diff --git a/libsecurity_ssl/lib/sslHandshakeFinish.c b/libsecurity_ssl/lib/sslHandshakeFinish.c
new file mode 100644 (file)
index 0000000..a1c8206
--- /dev/null
+++ b/libsecurity_ssl/lib/sslHandshakeFinish.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 1999-2001,2005-2007,2010-2012 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@
+ */
+
+/*
+ * sslHandshakeFinish.c - Finished and server hello done messages.
+ */
+
+#include "sslContext.h"
+#include "sslHandshake.h"
+#include "sslMemory.h"
+#include "sslDebug.h"
+#include "sslUtils.h"
+#include "sslDigests.h"
+
+#include <string.h>
+#include <assert.h>
+
+OSStatus
+SSLEncodeFinishedMessage(SSLRecord *finished, SSLContext *ctx)
+{   OSStatus        err;
+    SSLBuffer       finishedMsg;
+    Boolean         isServerMsg;
+    unsigned           finishedSize;
+       UInt8           *p;
+    int             head;
+
+       /* size and version depend on negotiatedProtocol */
+       switch(ctx->negProtocolVersion) {
+               case SSL_Version_3_0:
+                       finishedSize = 36;
+                       break;
+        case DTLS_Version_1_0:
+               case TLS_Version_1_0:
+        case TLS_Version_1_1:
+        case TLS_Version_1_2: /* TODO: Support variable finishedSize. */
+                       finishedSize = 12;
+                       break;
+               default:
+                       assert(0);
+                       return errSSLInternal;
+       }
+    finished->protocolVersion = ctx->negProtocolVersion;
+
+    finished->contentType = SSL_RecordTypeHandshake;
+       /* msg = type + 3 bytes len + finishedSize */
+    head = SSLHandshakeHeaderSize(finished);
+    if ((err = SSLAllocBuffer(&finished->contents, finishedSize + head,
+                       ctx)) != 0)
+        return err;
+
+    p = SSLEncodeHandshakeHeader(ctx, finished, SSL_HdskFinished, finishedSize);
+
+    finishedMsg.data = p;
+    finishedMsg.length = finishedSize;
+
+    isServerMsg = (ctx->protocolSide == kSSLServerSide) ? true : false;
+    err = ctx->sslTslCalls->computeFinishedMac(ctx, finishedMsg, isServerMsg);
+
+    if(err)
+        return err;
+
+    /* Keep this around for secure renegotiation */
+    SSLFreeBuffer(&ctx->ownVerifyData, ctx);
+    return SSLCopyBuffer(&finishedMsg, &ctx->ownVerifyData);
+}
+
+OSStatus
+SSLProcessFinished(SSLBuffer message, SSLContext *ctx)
+{   OSStatus        err;
+    SSLBuffer       expectedFinished;
+    Boolean         isServerMsg;
+    unsigned           finishedSize;
+
+       switch(ctx->negProtocolVersion) {
+               case SSL_Version_3_0:
+                       finishedSize = 36;
+                       break;
+               case DTLS_Version_1_0:
+               case TLS_Version_1_0:
+        case TLS_Version_1_1:
+        case TLS_Version_1_2: /* TODO: Support variable finishedSize. */
+                       finishedSize = 12;
+                       break;
+               default:
+                       assert(0);
+                       return errSSLInternal;
+       }
+    if (message.length != finishedSize) {
+               sslErrorLog("SSLProcessFinished: msg len error 1\n");
+        return errSSLProtocol;
+    }
+    expectedFinished.data = 0;
+    if ((err = SSLAllocBuffer(&expectedFinished, finishedSize, ctx)) != 0)
+        return err;
+    isServerMsg = (ctx->protocolSide == kSSLServerSide) ? false : true;
+    if ((err = ctx->sslTslCalls->computeFinishedMac(ctx, expectedFinished, isServerMsg)) != 0)
+        goto fail;
+
+    if (memcmp(expectedFinished.data, message.data, finishedSize) != 0)
+    {
+               sslErrorLog("SSLProcessFinished: memcmp failure\n");
+               err = errSSLProtocol;
+        goto fail;
+    }
+
+    /* Keep this around for secure renegotiation */
+    SSLFreeBuffer(&ctx->peerVerifyData, ctx);
+    err = SSLCopyBuffer(&expectedFinished, &ctx->peerVerifyData);
+
+fail:
+    SSLFreeBuffer(&expectedFinished, ctx);
+    return err;
+}
+
+OSStatus
+SSLEncodeServerHelloDone(SSLRecord *helloDone, SSLContext *ctx)
+{   OSStatus          err;
+    int               head;
+
+    helloDone->contentType = SSL_RecordTypeHandshake;
+       assert(ctx->negProtocolVersion >= SSL_Version_3_0);
+    helloDone->protocolVersion = ctx->negProtocolVersion;
+    head = SSLHandshakeHeaderSize(helloDone);
+    if ((err = SSLAllocBuffer(&helloDone->contents, head, ctx)) != 0)
+        return err;
+
+    SSLEncodeHandshakeHeader(ctx, helloDone, SSL_HdskServerHelloDone, 0); /* Message has 0 length */
+
+    return noErr;
+}
+
+OSStatus
+SSLProcessServerHelloDone(SSLBuffer message, SSLContext *ctx)
+{   assert(ctx->protocolSide == kSSLClientSide);
+    if (message.length != 0) {
+       sslErrorLog("SSLProcessServerHelloDone: nonzero msg len\n");
+        return errSSLProtocol;
+    }
+    return noErr;
+}