libsecurity_ssl/lib/sslHandshakeFinish.c

   1 /*
   2  * Copyright (c) 1999-2001,2005-2007,2010-2012 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * sslHandshakeFinish.c - Finished and server hello done messages.
  26  */
  27
  28 #include "sslContext.h"
  29 #include "sslHandshake.h"
  30 #include "sslMemory.h"
  31 #include "sslDebug.h"
  32 #include "sslUtils.h"
  33 #include "sslDigests.h"
  34
  35 #include <string.h>
  36 #include <assert.h>
  37
  38 OSStatus
  39 SSLEncodeFinishedMessage(SSLRecord *finished, SSLContext *ctx)
  40 {   OSStatus        err;
  41     SSLBuffer       finishedMsg;
  42     Boolean         isServerMsg;
  43     unsigned            finishedSize;
  44         UInt8           *p;
  45     int             head;
  46
  47         /* size and version depend on negotiatedProtocol */
  48         switch(ctx->negProtocolVersion) {
  49                 case SSL_Version_3_0:
  50                         finishedSize = 36;
  51                         break;
  52         case DTLS_Version_1_0:
  53                 case TLS_Version_1_0:
  54         case TLS_Version_1_1:
  55         case TLS_Version_1_2: /* TODO: Support variable finishedSize. */
  56                         finishedSize = 12;
  57                         break;
  58                 default:
  59                         assert(0);
  60                         return errSSLInternal;
  61         }
  62     finished->protocolVersion = ctx->negProtocolVersion;
  63
  64     finished->contentType = SSL_RecordTypeHandshake;
  65         /* msg = type + 3 bytes len + finishedSize */
  66     head = SSLHandshakeHeaderSize(finished);
  67     if ((err = SSLAllocBuffer(&finished->contents, finishedSize + head,
  68                         ctx)) != 0)
  69         return err;
  70
  71     p = SSLEncodeHandshakeHeader(ctx, finished, SSL_HdskFinished, finishedSize);
  72
  73     finishedMsg.data = p;
  74     finishedMsg.length = finishedSize;
  75
  76     isServerMsg = (ctx->protocolSide == kSSLServerSide) ? true : false;
  77     err = ctx->sslTslCalls->computeFinishedMac(ctx, finishedMsg, isServerMsg);
  78
  79     if(err)
  80         return err;
  81
  82     /* Keep this around for secure renegotiation */
  83     SSLFreeBuffer(&ctx->ownVerifyData, ctx);
  84     return SSLCopyBuffer(&finishedMsg, &ctx->ownVerifyData);
  85 }
  86
  87 OSStatus
  88 SSLProcessFinished(SSLBuffer message, SSLContext *ctx)
  89 {   OSStatus        err;
  90     SSLBuffer       expectedFinished;
  91     Boolean         isServerMsg;
  92     unsigned            finishedSize;
  93
  94         switch(ctx->negProtocolVersion) {
  95                 case SSL_Version_3_0:
  96                         finishedSize = 36;
  97                         break;
  98                 case DTLS_Version_1_0:
  99                 case TLS_Version_1_0:
 100         case TLS_Version_1_1:
 101         case TLS_Version_1_2: /* TODO: Support variable finishedSize. */
 102                         finishedSize = 12;
 103                         break;
 104                 default:
 105                         assert(0);
 106                         return errSSLInternal;
 107         }
 108     if (message.length != finishedSize) {
 109                 sslErrorLog("SSLProcessFinished: msg len error 1\n");
 110         return errSSLProtocol;
 111     }
 112     expectedFinished.data = 0;
 113     if ((err = SSLAllocBuffer(&expectedFinished, finishedSize, ctx)) != 0)
 114         return err;
 115     isServerMsg = (ctx->protocolSide == kSSLServerSide) ? false : true;
 116     if ((err = ctx->sslTslCalls->computeFinishedMac(ctx, expectedFinished, isServerMsg)) != 0)
 117         goto fail;
 118
 119     if (memcmp(expectedFinished.data, message.data, finishedSize) != 0)
 120     {
 121                 sslErrorLog("SSLProcessFinished: memcmp failure\n");
 122                 err = errSSLProtocol;
 123         goto fail;
 124     }
 125
 126     /* Keep this around for secure renegotiation */
 127     SSLFreeBuffer(&ctx->peerVerifyData, ctx);
 128     err = SSLCopyBuffer(&expectedFinished, &ctx->peerVerifyData);
 129
 130 fail:
 131     SSLFreeBuffer(&expectedFinished, ctx);
 132     return err;
 133 }
 134
 135 OSStatus
 136 SSLEncodeServerHelloDone(SSLRecord *helloDone, SSLContext *ctx)
 137 {   OSStatus          err;
 138     int               head;
 139
 140     helloDone->contentType = SSL_RecordTypeHandshake;
 141         assert(ctx->negProtocolVersion >= SSL_Version_3_0);
 142     helloDone->protocolVersion = ctx->negProtocolVersion;
 143     head = SSLHandshakeHeaderSize(helloDone);
 144     if ((err = SSLAllocBuffer(&helloDone->contents, head, ctx)) != 0)
 145         return err;
 146
 147     SSLEncodeHandshakeHeader(ctx, helloDone, SSL_HdskServerHelloDone, 0); /* Message has 0 length */
 148
 149     return noErr;
 150 }
 151
 152 OSStatus
 153 SSLProcessServerHelloDone(SSLBuffer message, SSLContext *ctx)
 154 {   assert(ctx->protocolSide == kSSLClientSide);
 155     if (message.length != 0) {
 156         sslErrorLog("SSLProcessServerHelloDone: nonzero msg len\n");
 157         return errSSLProtocol;
 158     }
 159     return noErr;
 160 }