256 lines
10 KiB
C
256 lines
10 KiB
C
#ifdef HAVE_ETH2
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#include <string.h>
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#include "eth_plugin_internal.h"
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#include "eth_plugin_handler.h"
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#include "shared_context.h"
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#include "ethUtils.h"
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#include "utils.h"
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#include "withdrawal_index.h"
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void getEth2PublicKey(uint32_t *bip32Path, uint8_t bip32PathLength, uint8_t *out);
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#define WITHDRAWAL_KEY_PATH_1 12381
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#define WITHDRAWAL_KEY_PATH_2 3600
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#define WITHDRAWAL_KEY_PATH_4 0
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#define ETH2_DEPOSIT_PUBKEY_OFFSET 0x80
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#define ETH2_WITHDRAWAL_CREDENTIALS_OFFSET 0xE0
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#define ETH2_SIGNATURE_OFFSET 0x120
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#define ETH2_DEPOSIT_PUBKEY_LENGTH 0x30
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#define ETH2_WITHDRAWAL_CREDENTIALS_LENGTH 0x20
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#define ETH2_SIGNATURE_LENGTH 0x60
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#define DEPOSIT_CONTRACT_ADDRESS "0x00000000219ab540356cbb839cbe05303d7705fa"
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#define DEPOSIT_CONTRACT_LENGTH sizeof(DEPOSIT_CONTRACT_ADDRESS)
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char deposit_address[ETH2_DEPOSIT_PUBKEY_LENGTH];
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typedef struct eth2_deposit_parameters_t {
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uint8_t valid;
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} eth2_deposit_parameters_t;
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static void to_lowercase(char *str, unsigned char size) {
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for (unsigned char i = 0; i < size && str[i] != 0; i++) {
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if (str[i] >= 'A' && str[i] <= 'Z') {
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str[i] += 'a' - 'A';
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}
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}
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}
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// Fills the `out` buffer with the lowercase string representation of the pubkey passed in as binary
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// format by `in`. Does not check the size, so expects `out` to be big enough to told the string
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// representation. Returns the length of string (counting the null terminating character).
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static int getEthDisplayableAddress(char *out, uint8_t *in) {
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out[0] = '0';
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out[1] = 'x';
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getEthAddressStringFromBinary(in, (uint8_t *) out + 2, &global_sha3, chainConfig);
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uint8_t destinationLen = strlen(out) + 1; // Adding one to account for \0.
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// Ensure address is in lowercase, to match DEPOSIT_CONTRACT_ADDRESS' case.
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to_lowercase(out, destinationLen);
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return (destinationLen);
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}
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static int check_deposit_contract(ethPluginInitContract_t *msg) {
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txContent_t *content = msg->pluginSharedRO->txContent;
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char destinationAddress[DEPOSIT_CONTRACT_LENGTH];
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uint8_t destinationLen = getEthDisplayableAddress(destinationAddress, content->destination);
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if (destinationLen != DEPOSIT_CONTRACT_LENGTH) {
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PRINTF("eth2plugin: destination lengths differ. Expected %u got %u\n",
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DEPOSIT_CONTRACT_LENGTH,
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destinationLen);
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return 0;
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} else if (memcmp(destinationAddress, DEPOSIT_CONTRACT_ADDRESS, DEPOSIT_CONTRACT_LENGTH) != 0) {
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PRINTF("eth2plugin: destination addresses differ. Expected %s got %s\n",
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DEPOSIT_CONTRACT_ADDRESS,
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destinationAddress);
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return 0;
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} else {
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return 1;
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}
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}
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void eth2_plugin_call(int message, void *parameters) {
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switch (message) {
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case ETH_PLUGIN_INIT_CONTRACT: {
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ethPluginInitContract_t *msg = (ethPluginInitContract_t *) parameters;
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eth2_deposit_parameters_t *context = (eth2_deposit_parameters_t *) msg->pluginContext;
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if (check_deposit_contract(msg) == 0) {
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PRINTF("eth2plugin: failed to check deposit contract\n");
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context->valid = 0;
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msg->result = ETH_PLUGIN_RESULT_ERROR;
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} else {
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context->valid = 1;
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msg->result = ETH_PLUGIN_RESULT_OK;
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}
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} break;
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case ETH_PLUGIN_PROVIDE_PARAMETER: {
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ethPluginProvideParameter_t *msg = (ethPluginProvideParameter_t *) parameters;
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eth2_deposit_parameters_t *context = (eth2_deposit_parameters_t *) msg->pluginContext;
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uint32_t index;
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PRINTF("eth2 plugin provide parameter %d %.*H\n",
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msg->parameterOffset,
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32,
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msg->parameter);
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switch (msg->parameterOffset) {
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case 4 + (32 * 0): // pubkey offset
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case 4 + (32 * 1): // withdrawal credentials offset
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case 4 + (32 * 2): // signature offset
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case 4 + (32 * 4): // deposit pubkey length
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case 4 + (32 * 7): // withdrawal credentials length
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case 4 + (32 * 9): // signature length
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{
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uint32_t check = 0;
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switch (msg->parameterOffset) {
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case 4 + (32 * 0):
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check = ETH2_DEPOSIT_PUBKEY_OFFSET;
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break;
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case 4 + (32 * 1):
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check = ETH2_WITHDRAWAL_CREDENTIALS_OFFSET;
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break;
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case 4 + (32 * 2):
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check = ETH2_SIGNATURE_OFFSET;
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break;
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case 4 + (32 * 4):
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check = ETH2_DEPOSIT_PUBKEY_LENGTH;
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break;
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case 4 + (32 * 7):
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check = ETH2_WITHDRAWAL_CREDENTIALS_LENGTH;
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break;
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case 4 + (32 * 9):
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check = ETH2_SIGNATURE_LENGTH;
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break;
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default:
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break;
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}
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index = U4BE(msg->parameter, 32 - 4);
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if (index != check) {
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PRINTF("eth2 plugin parameter check %d failed, expected %d got %d\n",
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msg->parameterOffset,
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check,
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index);
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context->valid = 0;
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}
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msg->result = ETH_PLUGIN_RESULT_OK;
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} break;
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case 4 + (32 * 5): // deposit pubkey 1
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{
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// Copy the first 32 bytes.
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memcpy(deposit_address, msg->parameter, sizeof(deposit_address));
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msg->result = ETH_PLUGIN_RESULT_OK;
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break;
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}
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case 4 + (32 * 6): // deposit pubkey 2
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{
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// Copy the last 16 bytes.
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memcpy(deposit_address + 32, msg->parameter, sizeof(deposit_address) - 32);
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// Use a temporary buffer to store the string representation.
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char tmp[ETH2_DEPOSIT_PUBKEY_LENGTH];
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getEthDisplayableAddress(tmp, (uint8_t *) deposit_address);
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// Copy back the string to the global variable.
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strcpy(deposit_address, tmp);
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msg->result = ETH_PLUGIN_RESULT_OK;
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break;
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}
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case 4 + (32 * 3): // deposit data root
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case 4 + (32 * 10): // signature
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case 4 + (32 * 11):
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case 4 + (32 * 12):
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msg->result = ETH_PLUGIN_RESULT_OK;
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break;
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case 4 + (32 * 8): // withdrawal credentials
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{
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uint8_t tmp[48];
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uint32_t withdrawalKeyPath[4];
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withdrawalKeyPath[0] = WITHDRAWAL_KEY_PATH_1;
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withdrawalKeyPath[1] = WITHDRAWAL_KEY_PATH_2;
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if (eth2WithdrawalIndex > INDEX_MAX) {
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PRINTF("eth2 plugin: withdrawal index is too big\n");
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PRINTF("Got %u which is higher than INDEX_MAX (%u)\n",
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eth2WithdrawalIndex, INDEX_MAX); context->valid = 0;
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}
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withdrawalKeyPath[2] = eth2WithdrawalIndex;
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withdrawalKeyPath[3] = WITHDRAWAL_KEY_PATH_4;
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getEth2PublicKey(withdrawalKeyPath, 4, tmp);
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PRINTF("eth2 plugin computed withdrawal public key %.*H\n", 48, tmp);
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cx_hash_sha256(tmp, 48, tmp, 32);
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tmp[0] = 0;
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if (memcmp(tmp, msg->parameter, 32) != 0) {
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PRINTF("eth2 plugin invalid withdrawal credentials\n");
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PRINTF("Got %.*H\n", 32, msg->parameter);
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PRINTF("Expected %.*H\n", 32, tmp);
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context->valid = 0;
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}
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msg->result = ETH_PLUGIN_RESULT_OK;
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} break;
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default:
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PRINTF("Unhandled parameter offset\n");
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break;
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}
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} break;
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case ETH_PLUGIN_FINALIZE: {
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ethPluginFinalize_t *msg = (ethPluginFinalize_t *) parameters;
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eth2_deposit_parameters_t *context = (eth2_deposit_parameters_t *) msg->pluginContext;
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PRINTF("eth2 plugin finalize\n");
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if (context->valid) {
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msg->numScreens = 2;
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msg->uiType = ETH_UI_TYPE_GENERIC;
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msg->result = ETH_PLUGIN_RESULT_OK;
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} else {
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msg->result = ETH_PLUGIN_RESULT_FALLBACK;
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}
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} break;
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case ETH_PLUGIN_QUERY_CONTRACT_ID: {
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ethQueryContractID_t *msg = (ethQueryContractID_t *) parameters;
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strcpy(msg->name, "ETH2");
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strcpy(msg->version, "Deposit");
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msg->result = ETH_PLUGIN_RESULT_OK;
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} break;
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case ETH_PLUGIN_QUERY_CONTRACT_UI: {
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ethQueryContractUI_t *msg = (ethQueryContractUI_t *) parameters;
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// eth2_deposit_parameters_t *context =
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// (eth2_deposit_parameters_t*)msg->pluginContext;
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switch (msg->screenIndex) {
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case 0: { // Amount screen
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uint8_t decimals = WEI_TO_ETHER;
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uint8_t *ticker = (uint8_t *) PIC(chainConfig->coinName);
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strcpy(msg->title, "Amount");
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amountToString(tmpContent.txContent.value.value,
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tmpContent.txContent.value.length,
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decimals,
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(char *) ticker,
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msg->msg,
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100);
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msg->result = ETH_PLUGIN_RESULT_OK;
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} break;
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case 1: { // Deposit pubkey screen
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strcpy(msg->title, "Validator");
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strcpy(msg->msg, deposit_address);
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msg->result = ETH_PLUGIN_RESULT_OK;
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}
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default:
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break;
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}
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} break;
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default:
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PRINTF("Unhandled message %d\n", message);
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}
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}
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#endif
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