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remove old client hello processing by default, can turn on with OLD_HELLO_ALLOWED, add sanity checks before size front alloc

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toddouska
2014-10-31 13:23:50 -07:00
parent 1e7b579777
commit 0f641e07a2
3 changed files with 33 additions and 6 deletions
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1
cyassl/internal.h
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@@ -633,6 +633,7 @@ enum Misc {
TLSv1_MINOR = 1, /* TLSv1 minor version number */
TLSv1_1_MINOR = 2, /* TLSv1_1 minor version number */
TLSv1_2_MINOR = 3, /* TLSv1_2 minor version number */
OLD_HELLO_ID = 0x01, /* SSLv2 Client Hello Indicator */
INVALID_BYTE = 0xff, /* Used to initialize cipher specs values */
NO_COMPRESSION = 0,
ZLIB_COMPRESSION = 221, /* CyaSSL zlib compression */

28
src/internal.c
View File

@@ -6230,9 +6230,6 @@ int ProcessReply(CYASSL* ssl)
int ret = 0, type, readSz;
int atomicUser = 0;
word32 startIdx = 0;
#ifndef NO_CYASSL_SERVER
byte b0, b1;
#endif
#ifdef CYASSL_DTLS
int used;
#endif
@@ -6276,15 +6273,32 @@ int ProcessReply(CYASSL* ssl)
#endif
}
#ifndef NO_CYASSL_SERVER
#ifdef OLD_HELLO_ALLOWED
/* see if sending SSLv2 client hello */
if ( ssl->options.side == CYASSL_SERVER_END &&
ssl->options.clientState == NULL_STATE &&
ssl->buffers.inputBuffer.buffer[ssl->buffers.inputBuffer.idx]
!= handshake) {
byte b0, b1;
ssl->options.processReply = runProcessOldClientHello;
/* sanity checks before getting size at front */
if (ssl->buffers.inputBuffer.buffer[
ssl->buffers.inputBuffer.idx + 2] != OLD_HELLO_ID) {
CYASSL_MSG("Not a valid old client hello");
return PARSE_ERROR;
}
if (ssl->buffers.inputBuffer.buffer[
ssl->buffers.inputBuffer.idx + 3] != SSLv3_MAJOR &&
ssl->buffers.inputBuffer.buffer[
ssl->buffers.inputBuffer.idx + 3] != DTLS_MAJOR) {
CYASSL_MSG("Not a valid version in old client hello");
return PARSE_ERROR;
}
/* how many bytes need ProcessOldClientHello */
b0 =
ssl->buffers.inputBuffer.buffer[ssl->buffers.inputBuffer.idx++];
@@ -6329,7 +6343,7 @@ int ProcessReply(CYASSL* ssl)
return 0;
}
#endif /* NO_CYASSL_SERVER */
#endif /* OLD_HELLO_ALLOWED */
/* get the record layer header */
case getRecordLayerHeader:
@@ -12252,6 +12266,8 @@ int DoSessionTicket(CYASSL* ssl,
}
#ifdef OLD_HELLO_ALLOWED
/* process old style client hello, deprecate? */
int ProcessOldClientHello(CYASSL* ssl, const byte* input, word32* inOutIdx,
word32 inSz, word16 sz)
@@ -12429,6 +12445,8 @@ int DoSessionTicket(CYASSL* ssl,
return MatchSuite(ssl, &clSuites);
}
#endif /* OLD_HELLO_ALLOWED */
static int DoClientHello(CYASSL* ssl, const byte* input, word32* inOutIdx,
word32 helloSz)

10
src/sniffer.c
View File

@@ -2038,6 +2038,8 @@ static SnifferSession* CreateSession(IpInfo* ipInfo, TcpInfo* tcpInfo,
}
#ifdef OLD_HELLO_ALLOWED
/* Process Old Client Hello Input */
static int DoOldHello(SnifferSession* session, const byte* sslFrame,
int* rhSize, int* sslBytes, char* error)
@@ -2074,6 +2076,8 @@ static int DoOldHello(SnifferSession* session, const byte* sslFrame,
return 0;
}
#endif /* OLD_HELLO_ALLOWED */
#if 0
/* Calculate the TCP checksum, see RFC 1071 */
@@ -2510,7 +2514,9 @@ static int CheckPreRecord(IpInfo* ipInfo, TcpInfo* tcpInfo,
*sslFrame = ssl->buffers.inputBuffer.buffer;
*end = *sslFrame + *sslBytes;
}
#ifdef OLD_HELLO_ALLOWED
if ((*session)->flags.clientHello == 0 && **sslFrame != handshake) {
int rhSize;
int ret = DoOldHello(*session, *sslFrame, &rhSize, sslBytes, error);
@@ -2519,6 +2525,8 @@ static int CheckPreRecord(IpInfo* ipInfo, TcpInfo* tcpInfo,
if (*sslBytes <= 0)
return 1;
}
#endif
return 0;
}