mirror of https://github.com/wolfSSL/wolfssl.git
added OCSP Response simple parsing
John Safranek
parent
8fe36b417f
commit
cbde04a06b
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@ -3728,3 +3728,331 @@ int EccPrivateKeyDecode(const byte* input, word32* inOutIdx, ecc_key* key,
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}
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#endif /* HAVE_ECC */
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#ifdef HAVE_OCSP
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static int GetEnumerated(const byte* input, word32* inOutIdx, int *value)
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{
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word32 idx = *inOutIdx;
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word32 len;
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*value = 0;
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if (input[idx++] != ASN_ENUMERATED)
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return ASN_PARSE_E;
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len = input[idx++];
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if (len > 4)
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return ASN_PARSE_E;
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while (len--) {
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*value = *value << 8 | input[idx++];
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}
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*inOutIdx = idx;
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return *value;
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}
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static int GetObjectId(const byte* input, word32* inOutIdx, word32* oid,
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word32 maxIdx)
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{
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int length;
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word32 i = *inOutIdx;
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byte b;
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*oid = 0;
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b = input[i++];
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if (b != ASN_OBJECT_ID)
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return ASN_OBJECT_ID_E;
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if (GetLength(input, &i, &length, maxIdx) < 0)
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return ASN_PARSE_E;
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while(length--)
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*oid += input[i++];
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/* just sum it up for now */
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*inOutIdx = i;
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return 0;
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}
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static int DecodeSingleResponse(byte* source,
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word32* ioIndex, OcspResponse* resp, word32 size)
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{
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word32 index = *ioIndex, prevIndex, oid, mpi_len;
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int length, remainder, qty = 0;
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mp_int mpi;
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byte serialTmp[EXTERNAL_SERIAL_SIZE];
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/* Outer wrapper of the SEQUENCE OF Single Responses. */
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if (GetSequence(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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remainder = length;
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/* First Single Response */
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while (remainder != 0 && qty < STATUS_LIST_SIZE)
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{
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prevIndex = index;
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/* Wrapper around the Single Response */
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if (GetSequence(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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/* Wrapper around the CertID */
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if (GetSequence(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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/* Skip the hash algorithm */
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if (GetAlgoId(source, &index, &oid, size) < 0)
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return ASN_PARSE_E;
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/* Skip the hash of CN */
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if (source[index++] != ASN_OCTET_STRING)
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return ASN_PARSE_E;
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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index += length;
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/* Skip the hash of the issuer public key */
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if (source[index++] != ASN_OCTET_STRING)
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return ASN_PARSE_E;
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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index += length;
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/* Read the serial number */
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if (GetInt(&mpi, source, &index, size) < 0)
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return ASN_PARSE_E;
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mpi_len = mp_unsigned_bin_size(&mpi);
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if (mpi_len < (int)sizeof(serialTmp)) {
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if (mp_to_unsigned_bin(&mpi, serialTmp) == MP_OKAY) {
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if (mpi_len > EXTERNAL_SERIAL_SIZE)
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mpi_len = EXTERNAL_SERIAL_SIZE;
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XMEMCPY(resp->certSN[qty], serialTmp, mpi_len);
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resp->certSNsz[qty] = mpi_len;
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}
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}
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mp_clear(&mpi);
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/* CertStatus */
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switch (source[index++])
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{
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case (ASN_CONTEXT_SPECIFIC | CERT_GOOD):
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resp->certStatus[qty] = CERT_GOOD;
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index++;
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break;
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case (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | CERT_REVOKED):
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resp->certStatus[qty] = CERT_REVOKED;
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GetLength(source, &index, &length, size);
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index += length;
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break;
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case (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | CERT_UNKNOWN):
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resp->certStatus[qty] = CERT_UNKNOWN;
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index++;
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break;
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default:
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return ASN_PARSE_E;
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}
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if (source[index++] != ASN_GENERALIZED_TIME)
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return ASN_PARSE_E;
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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index += length;
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remainder = remainder + prevIndex - index;
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qty++;
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}
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resp->certStatusCount = qty;
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*ioIndex = index;
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return 0;
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}
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static int DecodeResponseData(byte* source,
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word32* ioIndex, OcspResponse* resp, word32 size)
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{
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word32 index = *ioIndex;
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int length, result;
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int version;
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word32 responderId = 0;
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if (GetSequence(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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resp->respBegin = index;
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resp->respLength = length;
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/* Get version. It is an EXPLICIT[0] DEFAULT(0) value. If this
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* item isn't an EXPLICIT[0], then set version to zero and move
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* onto the next item.
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*/
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if (source[index] == (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED))
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{
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index += 2; /* Eat the value and length */
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if (GetMyVersion(source, &index, &version) < 0)
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return ASN_PARSE_E;
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} else
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version = 0;
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responderId = source[index++];
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if ((responderId == (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | 1)) ||
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(responderId == (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | 2)))
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{
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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index += length;
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}
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else
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return ASN_PARSE_E;
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/* Skip GeneralizedTime */
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if (source[index++] != ASN_GENERALIZED_TIME)
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return ASN_PARSE_E;
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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index += length;
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if (DecodeSingleResponse(source, &index, resp, size) < 0)
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return ASN_PARSE_E;
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/* Skip the extensions */
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if (source[index++] == (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | 1))
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{
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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index += length;
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}
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*ioIndex = index;
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return 0;
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}
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static int DecodeCerts(byte* source,
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word32* ioIndex, OcspResponse* resp, word32 size)
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{
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word32 index = *ioIndex;
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if (source[index++] == (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC))
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{
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int length;
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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index += length;
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}
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*ioIndex = index;
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return 0;
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}
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static int DecodeBasicOcspResponse(byte* source,
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word32* ioIndex, OcspResponse* resp, word32 size)
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{
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int length;
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word32 index = *ioIndex;
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word32 end_index;
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if (GetSequence(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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if (index + length > size)
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return ASN_INPUT_E;
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end_index = index + length;
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if (DecodeResponseData(source, &index, resp, size) < 0)
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return ASN_PARSE_E;
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/* Get the signature algorithm */
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if (GetAlgoId(source, &index, &resp->sigOID, size) < 0)
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return ASN_PARSE_E;
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/* Obtain pointer to the start of the signature, and save the size */
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if (source[index++] == ASN_BIT_STRING)
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{
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int sigLength = 0;
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if (GetLength(source, &index, &sigLength, size) < 0)
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return ASN_PARSE_E;
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resp->sigLength = sigLength;
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resp->sigIndex = index;
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index += sigLength;
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}
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/*
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* Check the length of the BasicOcspResponse against the current index to
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* see if there are certificates, they are optional.
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*/
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if (index < end_index)
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return DecodeCerts(source, &index, resp, size);
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*ioIndex = index;
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return 0;
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}
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void InitOcspResponse(OcspResponse* resp, byte* source, word32 inSz, void* heap)
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{
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XMEMSET(resp, 0, sizeof(*resp));
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resp->source = source;
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resp->maxIdx = inSz;
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resp->heap = heap;
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}
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void FreeOcspResponse(OcspResponse* resp) {}
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int OcspResponseDecode(OcspResponse* resp)
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{
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int length = 0;
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word32 index = 0;
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byte* source = resp->source;
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word32 size = resp->maxIdx;
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word32 oid;
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/* peel the outer SEQUENCE wrapper */
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if (GetSequence(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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/* First get the responseStatus, an ENUMERATED */
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if (GetEnumerated(source, &index, &resp->responseStatus) < 0)
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return ASN_PARSE_E;
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if (resp->responseStatus != OCSP_SUCCESSFUL)
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return 0;
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/* Next is an EXPLICIT record called ResponseBytes, OPTIONAL */
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if (index >= size)
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return ASN_INPUT_E;
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if (source[index++] != (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC))
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return ASN_PARSE_E;
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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/* Get the responseBytes SEQUENCE */
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if (GetSequence(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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/* Check ObjectID for the resposeBytes */
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if (GetObjectId(source, &index, &oid, size) < 0)
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return ASN_PARSE_E;
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if (oid != OCSP_BASIC_OID)
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return ASN_PARSE_E;
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if (source[index++] != ASN_OCTET_STRING)
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return ASN_PARSE_E;
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if (GetLength(source, &index, &length, size) < 0)
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return ASN_PARSE_E;
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if (DecodeBasicOcspResponse(source, &index, resp, size) < 0)
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return ASN_PARSE_E;
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return 0;
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}
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int EncodeOcspRequest(void)
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{
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return 0;
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}
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#endif
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@ -56,6 +56,7 @@ enum ASN_Tags {
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ASN_OCTET_STRING = 0x04,
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ASN_TAG_NULL = 0x05,
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ASN_OBJECT_ID = 0x06,
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ASN_ENUMERATED = 0x0a,
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ASN_SEQUENCE = 0x10,
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ASN_SET = 0x11,
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ASN_UTC_TIME = 0x17,
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@ -302,6 +303,70 @@ enum cert_enums {
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#endif /* CYASSL_CERT_GEN */
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#ifdef HAVE_OCSP
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enum Ocsp_Response_Status {
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OCSP_SUCCESSFUL = 0, /* Response has valid confirmations */
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OCSP_MALFORMED_REQUEST = 1, /* Illegal confirmation request */
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OCSP_INTERNAL_ERROR = 2, /* Internal error in issuer */
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OCSP_TRY_LATER = 3, /* Try again later */
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OCSP_SIG_REQUIRED = 5, /* Must sign the request (4 is skipped) */
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OCSP_UNAUTHROIZED = 6 /* Request unauthorized */
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};
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enum Ocsp_Cert_Status {
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CERT_GOOD = 0,
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CERT_REVOKED = 1,
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CERT_UNKNOWN = 2
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};
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enum Ocsp_Sums {
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OCSP_BASIC_OID = 117
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};
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#define STATUS_LIST_SIZE 5
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typedef struct OcspResponse OcspResponse;
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struct OcspResponse {
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int responseStatus; /* return code from Responder */
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word32 respBegin; /* index to beginning of OCSP Response */
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word32 respLength; /* length of the OCSP Response */
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int version; /* Response version number */
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word32 sigIndex; /* Index into source for start of sig */
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word32 sigLength; /* Length in octets for the sig */
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word32 sigOID; /* OID for hash used for sig */
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int certStatusCount; /* Count of certificate statuses, Note
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* 1:1 correspondence between certStatus
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* and certSerialNumber */
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byte certSN[STATUS_LIST_SIZE][EXTERNAL_SERIAL_SIZE];
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int certSNsz[STATUS_LIST_SIZE];
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/* Certificate serial number array. */
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word32 certStatus[STATUS_LIST_SIZE];
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/* Certificate status array */
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byte* source; /* pointer to source buffer, not owned */
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word32 maxIdx; /* max offset based on init size */
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void* heap; /* for user memory overrides */
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};
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CYASSL_API void InitOcspResponse(OcspResponse*, byte*, word32, void*);
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CYASSL_API void FreeOcspResponse(OcspResponse*);
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CYASSL_API int OcspResponseDecode(OcspResponse*);
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#endif /* HAVE_OCSP */
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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