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Merge pull request #4752 from LinuxJedi/fix-ber-der

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Fix buffer overflows in BERtoDER
This commit is contained in:
JacobBarthelmeh
2022-01-17 21:05:39 -07:00
committed by GitHub
parent 84b06ac1b6 1a4bc322f7
commit e11d484746
1 changed files with 23 additions and 6 deletions
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29
wolfcrypt/src/pkcs7.c
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@@ -4451,17 +4451,32 @@ static int PKCS7_VerifySignedData(PKCS7* pkcs7, const byte* hashBuf,
return ret; return ret;
pkiMsg = in = pkcs7->der; pkiMsg = in = pkcs7->der;
pkiMsgSz = pkcs7->derSz = len; pkiMsgSz = inSz = pkcs7->derSz = len;
idx = 0; idx = 0;
if (GetSequence_ex(pkiMsg, &idx, &length, pkiMsgSz,
NO_USER_CHECK) < 0)
return ASN_PARSE_E;
#ifndef NO_PKCS7_STREAM #ifndef NO_PKCS7_STREAM
wc_PKCS7_ResetStream(pkcs7);
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
MAX_SEQ_SZ + MAX_VERSION_SZ + MAX_SEQ_SZ +
MAX_LENGTH_SZ + ASN_TAG_SZ + MAX_OID_SZ +
MAX_SEQ_SZ, &pkiMsg, &idx)) != 0) {
break;
}
pkiMsgSz = (pkcs7->stream->length > 0)? pkcs7->stream->length:
inSz;
totalSz = pkiMsgSz;
if (pkiMsg2 && pkiMsg2Sz > 0) {
totalSz += pkiMsg2Sz + pkcs7->contentSz;
}
if ((ret = wc_PKCS7_SetMaxStream(pkcs7, in, len)) != 0) { if ((ret = wc_PKCS7_SetMaxStream(pkcs7, in, len)) != 0) {
break; break;
} }
#endif #endif
if (GetSequence_ex(pkiMsg, &idx, &length, pkiMsgSz,
NO_USER_CHECK) < 0)
return ASN_PARSE_E;
#else #else
ret = BER_INDEF_E; ret = BER_INDEF_E;
#endif #endif
@@ -10497,8 +10512,10 @@ WOLFSSL_API int wc_PKCS7_DecodeEnvelopedData(PKCS7* pkcs7, byte* in,
#ifdef ASN_BER_TO_DER #ifdef ASN_BER_TO_DER
/* check if content was BER and has been converted to DER */ /* check if content was BER and has been converted to DER */
if (pkcs7->derSz > 0) if (pkcs7->derSz > 0) {
pkiMsg = in = pkcs7->der; pkiMsg = in = pkcs7->der;
pkiMsgSz = inSz = pkcs7->derSz;
}
#endif #endif
decryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ, pkcs7->heap, decryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ, pkcs7->heap,