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Boundaries check for DoHelloRequest. 

-- added size and totalSz in the function parameters;
-- BUFFER_ERROR returned in case of message overflow (piece larger than the message size);
-- INCOMPLETE_DATA returned in case of buffer overflow (piece smaller than the expected size);
-- removed unnecessary variable mac;
This commit is contained in:
Moisés Guimarães 2014-03-10 11:01:41 -03:00
parent 244e335e81
commit 881de67196
1 changed files with 16 additions and 12 deletions
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28
src/internal.c
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@ -3629,30 +3629,34 @@ static int DoCertificate(CYASSL* ssl, byte* input, word32* inOutIdx)
#endif /* !NO_CERTS */
static int DoHelloRequest(CYASSL* ssl, const byte* input, word32* inOutIdx)
static int DoHelloRequest(CYASSL* ssl, const byte* input, word32* inOutIdx,
word32 size, word32 totalSz)
{
if (size) /* must be 0 */
return BUFFER_ERROR;
if (ssl->keys.encryptionOn) {
const byte* mac;
int padSz = ssl->keys.encryptSz - HANDSHAKE_HEADER_SZ -
ssl->specs.hash_size;
byte verify[MAX_DIGEST_SIZE];
byte verify[MAX_DIGEST_SIZE];
int padSz = ssl->keys.encryptSz - HANDSHAKE_HEADER_SZ -
ssl->specs.hash_size;
ssl->hmac(ssl, verify, input + *inOutIdx - HANDSHAKE_HEADER_SZ,
HANDSHAKE_HEADER_SZ, handshake, 1);
/* read mac and fill */
mac = input + *inOutIdx;
*inOutIdx += ssl->specs.hash_size;
if (ssl->options.tls1_1 && ssl->specs.cipher_type == block)
padSz -= ssl->specs.block_size;
*inOutIdx += padSz;
/* access beyond input + size should be checked against totalSz */
if ((word32) (*inOutIdx + ssl->specs.hash_size + padSz) > totalSz)
return INCOMPLETE_DATA;
/* verify */
if (XMEMCMP(mac, verify, ssl->specs.hash_size) != 0) {
if (XMEMCMP(input + *inOutIdx, verify, ssl->specs.hash_size) != 0) {
CYASSL_MSG(" hello_request verify mac error");
return VERIFY_MAC_ERROR;
}
*inOutIdx += ssl->specs.hash_size + padSz;
}
if (ssl->options.side == CYASSL_SERVER_END) {
@ -3779,7 +3783,7 @@ static int DoHandShakeMsgType(CYASSL* ssl, byte* input, word32* inOutIdx,
case hello_request:
CYASSL_MSG("processing hello request");
ret = DoHelloRequest(ssl, input, inOutIdx);
ret = DoHelloRequest(ssl, input, inOutIdx, size, totalSz);
break;
#ifndef NO_CYASSL_CLIENT