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498 lines
15 KiB
C
498 lines
15 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include "l2_security.h"
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#include "ber_encoder.h"
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#include "ber_decode.h"
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#include "r_session_crypto.h"
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struct sL2Security {
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RSignatureAlgorithm currentSigAlgo;
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uint32_t timeOfCurrentKey;
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uint32_t currentKeyId;
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uint8_t* currentKey;
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int currentKeySize;
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int timeToNextKey;
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};
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static uint16_t poly[] = {
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0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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};
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/* see https://www.rfc-editor.org/rfc/rfc1662#page-19 */
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static uint16_t
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calculateCRC(uint8_t* data, int size)
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{
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uint16_t crc = 0xffff;
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int i;
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for (i = 0; i < size; i++) {
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crc = (uint16_t)(((uint16_t)(crc >> 8)) ^ poly[(crc ^ data[i]) & 0xff]);
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}
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return (uint16_t)(~crc);
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}
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uint16_t
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L2Security_calculateCRC16(uint8_t* data, int size)
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{
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return calculateCRC(data, size);
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}
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/**
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* \brief Create the security extension
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*
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* \param buffer buffer with the encoded GOOSE message (security extension will be added)
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* \param start start of the message payload used to calculate the MAC
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* \param length length of the message payload
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*
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* \return length of the security extension
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*/
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uint16_t
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L2Security_addSecurityExtension(L2Security self, uint8_t* buffer, int start, int length, int maxBufSize, bool encode)
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{
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printf("L2Security_addSecurityExtension: start=%i, length=%i, maxBufSize=%i\n", start, length, maxBufSize);
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if (self->currentSigAlgo != MC_SEC_SIG_ALGO_NONE)
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{
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bool hasIV = false;
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int ivSize = 0;
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int mACSize = 0;
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/* determine length of the mAC */
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if (self->currentSigAlgo == MC_SEC_SIG_ALGO_HMAC_SHA256_128) {
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mACSize = 2 + 16;
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}
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else if (self->currentSigAlgo == MC_SEC_SIG_ALGO_HMAC_SHA256_256) {
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mACSize = 2 + 32;
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}
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else if (self->currentSigAlgo == MC_SEC_SIG_ALGO_AES_GMAC_64) {
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mACSize = 2 + 8;
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}
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else if (self->currentSigAlgo == MC_SEC_SIG_ALGO_AES_GMAC_128) {
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mACSize = 2 + 16;
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}
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else {
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/* signature algorithm not supported */
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printf("Signature algorithm not supported\n");
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return 0;
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}
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uint32_t securityExtensionSize = 0;
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/* TODO check for applicable/valid key */
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/* determine length of the AuthenticationValue */
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uint32_t authValueSize = 3; /* TLV(Version) */
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/* TimeofCurrentKey */
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authValueSize += (2 + BerEncoder_UInt32determineEncodedSize(self->timeOfCurrentKey));
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/* TimeToNextKey */
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authValueSize += (2 + BerEncoder_Int32determineEncodedSize(self->timeToNextKey));
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/* IV */
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if (hasIV) {
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authValueSize += (2 + ivSize);
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}
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/* Key ID */
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authValueSize += (2 + BerEncoder_UInt32determineEncodedSize(self->currentKeyId));
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securityExtensionSize += (1 + BerEncoder_determineLengthSize(authValueSize) + authValueSize);
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securityExtensionSize += mACSize;
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/* check that total size fits into the buffer! */
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int bufPos = start + length;
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if (bufPos + securityExtensionSize > maxBufSize) {
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printf("L2_SECURITY: security extension doesn't fit into message\n");
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return 0;
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}
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/* start encoding ... */
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if (encode)
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{
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bufPos = BerEncoder_encodeTL(0xa0, securityExtensionSize, buffer, bufPos);
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bufPos = BerEncoder_encodeTL(0xa4, authValueSize, buffer, bufPos);
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/* encode AuthenticationValue content */
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/* Version */
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bufPos = BerEncoder_encodeInt32WithTL(0x80, 1, buffer, bufPos);
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/* TimeofCurrentKey */
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bufPos = BerEncoder_encodeInt32WithTL(0x81, self->timeOfCurrentKey, buffer, bufPos);
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/* TimeofNextKey */
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bufPos = BerEncoder_encodeInt32WithTL(0x82, self->timeToNextKey, buffer, bufPos);
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/* IV */
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if (hasIV) {
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//TODO encode IV
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}
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/* KeyID */
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bufPos = BerEncoder_encodeInt32WithTL(0x84, self->currentKeyId, buffer, bufPos);
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int macEnd = bufPos;
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/* encode mAC */
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bufPos = BerEncoder_encodeTL(0x85, mACSize - 2, buffer, bufPos);
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if (self->currentSigAlgo == MC_SEC_SIG_ALGO_HMAC_SHA256_128) {
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RSessionCrypto_createHMAC(buffer + start, macEnd, self->currentKey, self->currentKeySize, buffer + bufPos, 16);
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bufPos += 16;
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}
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else if (self->currentSigAlgo == MC_SEC_SIG_ALGO_HMAC_SHA256_256) {
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RSessionCrypto_createHMAC(buffer + start, macEnd - start, self->currentKey, self->currentKeySize, buffer + bufPos, 32);
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bufPos += 32;
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}
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else if (self->currentSigAlgo == MC_SEC_SIG_ALGO_AES_GMAC_64)
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{
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/* create IV */
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uint8_t iv[12];
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int ivSize = 12;
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if (RSessionCrypto_createRandomData(iv, ivSize) == false) {
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printf("ERROR - Failed to create random IV\n");
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}
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if (RSessionCrypto_createAES_GMAC(self->currentKey, self->currentKeySize, iv, ivSize, buffer + start, macEnd - start, buffer + bufPos, 8) == false)
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{
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printf("ERROR - Failed to create GMAC\n");
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}
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bufPos += 8;
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}
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else if (self->currentSigAlgo == MC_SEC_SIG_ALGO_AES_GMAC_128)
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{
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/* create IV */
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uint8_t iv[12];
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int ivSize = 12;
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if (RSessionCrypto_createRandomData(iv, ivSize) == false) {
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printf("ERROR - Failed to create random IV\n");
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}
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if (RSessionCrypto_createAES_GMAC(self->currentKey, self->currentKeySize, iv, ivSize, buffer + start, macEnd - start, buffer + bufPos, 16) == false)
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{
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printf("ERROR - Failed to create GMAC\n");
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}
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bufPos += 16;
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}
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else {
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/* signature algorithm not supported */
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printf("Signature algorithm not supported\n");
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return 0;
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}
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}
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return securityExtensionSize + 2;
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}
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else
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{
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printf("L2_SECURITY: no signature algorithm set\n");
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return 0;
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}
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}
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static bool
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checkSecurityExtension(L2Security self, uint8_t* buffer, int secExtLen, uint8_t* macStart)
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{
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bool hasIV = false;
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int ivSize = 0;
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uint8_t* ivBuffer = NULL;
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int mACSize = 0;
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uint8_t* mACBuffer = NULL;
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int bufPos = 0;
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/* determine length of the mAC */
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if (self->currentSigAlgo == MC_SEC_SIG_ALGO_HMAC_SHA256_128) {
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mACSize = 2 + 16;
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}
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else if (self->currentSigAlgo == MC_SEC_SIG_ALGO_HMAC_SHA256_256) {
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mACSize = 2 + 32;
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}
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else {
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/* signature algorithm not supported */
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printf("L2_SECURITY: signature algorithm not supported\n");
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return false;
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}
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while (bufPos < secExtLen)
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{
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int macEnd = (buffer - macStart) + bufPos;
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uint8_t tag = buffer[bufPos++];
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int len = 0;
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bufPos = BerDecoder_decodeLength(buffer, &len, bufPos, secExtLen);
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if (bufPos == -1)
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{
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printf("L2_SECURITY: invalid len for tag %02x\n", tag);
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return false;
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}
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if (tag == 0xa4)
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{
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/* AuthenticationValue */
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uint8_t* authValueBuf = buffer + bufPos;
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int authValuePos = 0;
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int authValueLen = len;
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while (authValuePos < authValueLen)
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{
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uint8_t authTag = authValueBuf[authValuePos++];
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int authLen = 0;
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authValuePos = BerDecoder_decodeLength(authValueBuf, &authLen, authValuePos, authValueLen);
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if (authValuePos == -1)
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{
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printf("L2_SECURITY: invalid len for tag %02x in AuthenticationValue\n", authTag);
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return false;
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}
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if (authTag == 0x80)
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{
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/* Version */
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int32_t version = BerDecoder_decodeInt32(authValueBuf, authLen, authValuePos);
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if (version != 1)
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{
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printf("L2_SECURITY: invalid version (%i) in AuthenticationValue\n", version);
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return false;
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}
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}
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else if (authTag == 0x81)
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{
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/* TimeofCurrentKey */
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self->timeOfCurrentKey = BerDecoder_decodeUint32(authValueBuf, authLen, authValuePos);
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}
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else if (authTag == 0x82)
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{
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/* TimeToNextKey */
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self->timeToNextKey = BerDecoder_decodeInt32(authValueBuf, authLen, authValuePos);
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}
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else if (authTag == 0x83)
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{
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/* IV */
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hasIV = true;
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ivBuffer = authValueBuf + authValuePos;
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ivSize = authLen;
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}
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else if (authTag == 0x84)
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{
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/* KeyID */
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uint32_t keyId = BerDecoder_decodeUint32(authValueBuf, authLen, authValuePos);
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if (keyId != self->currentKeyId)
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{
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printf("L2_SECURITY: invalid key ID in AuthenticationValue\n");
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return false;
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}
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}
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else
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{
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printf("L2_SECURITY: invalid tag in AuthenticationValue\n");
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return false;
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}
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authValuePos += authLen;
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}
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}
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else if (tag == 0x85)
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{
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/* mAC */
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mACBuffer = buffer + bufPos;
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mACSize = len;
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printf("L2_SECURITY: found MAC with size: %i\n", mACSize);
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if (self->currentSigAlgo == MC_SEC_SIG_ALGO_HMAC_SHA256_128)
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{
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printf("Algo: HMAC_SHA256_128\n");
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uint8_t calculatedMac[16];
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RSessionCrypto_createHMAC(macStart, macEnd, self->currentKey, self->currentKeySize, calculatedMac, sizeof(calculatedMac));
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if (memcmp(calculatedMac, mACBuffer, 16) != 0)
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{
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printf("L2_SECURITY: MAC mismatch\n");
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return false;
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}
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}
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else if (self->currentSigAlgo == MC_SEC_SIG_ALGO_HMAC_SHA256_256)
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{
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printf("Algo: HMAC_SHA256_256\n");
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uint8_t calculatedMac[32];
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RSessionCrypto_createHMAC(macStart, macEnd, self->currentKey, self->currentKeySize, calculatedMac, sizeof(calculatedMac));
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if (memcmp(calculatedMac, mACBuffer, 32) != 0)
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{
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printf("L2_SECURITY: MAC mismatch\n");
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return false;
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}
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}
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else
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{
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printf("L2_SECURITY: signature algorithm not supported\n");
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return false;
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}
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}
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else {
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printf("L2_SECURITY: invalid tag %02x in security extension\n", tag);
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return false;
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}
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bufPos += len;
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}
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return true;
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}
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bool
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L2Security_checkSecurityExtension(L2Security self, uint8_t* buffer, int start, int length, int secExtSize)
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{
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if (self->currentSigAlgo == MC_SEC_SIG_ALGO_NONE)
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{
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if (secExtSize > 0)
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{
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printf("L2_SECURITY: security extension found but no security association\n");
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return false;
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}
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else
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{
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return true;
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}
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}
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else
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{
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uint8_t* secExtBuf = buffer + start + length;
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int bufPos = 0;
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while (bufPos < secExtSize)
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{
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uint8_t tag = secExtBuf[bufPos++];
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int len = 0;
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bufPos = BerDecoder_decodeLength(secExtBuf, &len, bufPos, secExtSize);
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if (bufPos == -1)
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{
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printf("L2_SECURITY: [2] invalid len for tag %02x\n", tag);
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return false;
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}
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if (tag == 0xa0)
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{
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/* SecurityExtension */
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printf("L2_SECURITY: found security extension\n");
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return checkSecurityExtension(self, secExtBuf + bufPos, len, buffer + start - 2);
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}
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else {
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printf("L2_SECURITY: invalid tag %02x in security extension\n", tag);
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return false;
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}
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}
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return false;
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}
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}
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L2Security
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L2Security_create()
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{
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L2Security self = (L2Security)GLOBAL_CALLOC(1, sizeof(struct sL2Security));
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if (self) {
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}
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return self;
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}
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MCKeyError
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L2Security_addKey(L2Security self, uint32_t keyId, uint8_t* key, int keyLength, MCSecurityAlgorithm secAlgo, MCSignatureAlgorithm sigAlgo)
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{
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self->currentKeyId = keyId;
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self->currentSigAlgo = sigAlgo;
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self->currentKey = key;
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self->currentKeySize = keyLength;
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}
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MCKeyError
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L2Security_removeKey(L2Security self, uint32_t keyId)
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{
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}
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|
void
|
|
L2Security_removeAllKeys(L2Security self)
|
|
{
|
|
|
|
}
|
|
|
|
RSessionError
|
|
L2Security_setActiveKey(L2Security self, uint32_t keyId)
|
|
{
|
|
self->currentKeyId = keyId;
|
|
}
|
|
|
|
void
|
|
L2Security_destroy(L2Security self)
|
|
{
|
|
if (self) {
|
|
GLOBAL_FREEMEM(self);
|
|
}
|
|
}
|