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Fix for handling max cert chain size. It was not accounting for the 3 byte header in max size calculation.

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This commit is contained in:
David Garske 2018-07-11 12:32:49 -07:00
parent e2dec618d8
commit 05cfeae3ce
1 changed files with 12 additions and 7 deletions
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19
src/ssl.c
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@ -4263,15 +4263,16 @@ static int ProcessUserChain(WOLFSSL_CTX* ctx, const unsigned char* buff,
#endif
byte* chainBuffer = staticBuffer;
int dynamicBuffer = 0;
word32 bufferSz = sizeof(staticBuffer);
word32 bufferSz;
long consumed = info->consumed;
word32 idx = 0;
int gotOne = 0;
if ( (sz - consumed) > (int)bufferSz) {
/* Calculate max possible size, including max headers */
bufferSz = (word32)(sz - consumed) + (CERT_HEADER_SZ * MAX_CHAIN_DEPTH);
if (bufferSz > sizeof(staticBuffer)) {
WOLFSSL_MSG("Growing Tmp Chain Buffer");
bufferSz = (word32)(sz - consumed);
/* will shrink to actual size */
/* will shrink to actual size */
chainBuffer = (byte*)XMALLOC(bufferSz, heap, DYNAMIC_TYPE_FILE);
if (chainBuffer == NULL) {
return MEMORY_E;
@ -4301,7 +4302,7 @@ static int ProcessUserChain(WOLFSSL_CTX* ctx, const unsigned char* buff,
if (GetSequence(buff + consumed, &inOutIdx, &length, remain) < 0) {
ret = ASN_NO_PEM_HEADER;
}
length += inOutIdx; /* include leading squence */
length += inOutIdx; /* include leading sequence */
}
info->consumed = length;
if (ret == 0) {
@ -4316,7 +4317,7 @@ static int ProcessUserChain(WOLFSSL_CTX* ctx, const unsigned char* buff,
#ifdef WOLFSSL_TLS13
cnt++;
#endif
if ((idx + part->length) > bufferSz) {
if ((idx + part->length + CERT_HEADER_SZ) > bufferSz) {
WOLFSSL_MSG(" Cert Chain bigger than buffer");
ret = BUFFER_E;
}
@ -4446,7 +4447,7 @@ int ProcessBuffer(WOLFSSL_CTX* ctx, const unsigned char* buff,
if (GetSequence(buff, &inOutIdx, &length, (word32)sz) < 0) {
ret = ASN_PARSE_E;
}
length += inOutIdx; /* include leading squence */
length += inOutIdx; /* include leading sequence */
}
info->consumed = length;
@ -4465,6 +4466,10 @@ int ProcessBuffer(WOLFSSL_CTX* ctx, const unsigned char* buff,
/* process user chain */
if (ret >= 0) {
/* First certificate in chain is loaded into ssl->buffers.certificate.
* Remainder are loaded into ssl->buffers.certChain.
* Chain should have server cert first, then intermediates, then root.
*/
if (userChain) {
ret = ProcessUserChain(ctx, buff, sz, format, type, ssl, used, info);
}