144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
#undef IS_WINDOWS
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#if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__)
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#define IS_WINDOWS 1
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#endif
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define CONFIG_B2SUM_SIGNATURE "++CONFIG_B2SUM_SIGNATURE++"
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static void usage(const char *name) {
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printf("Usage: %s <Limine executable> <BLAKE2B of config file>\n", name);
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printf("\n");
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printf(" --reset Remove enrolled BLAKE2B, will not check config integrity\n");
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printf("\n");
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printf(" --quiet Do not print verbose diagnostic messages\n");
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printf("\n");
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printf(" --help | -h Display this help message\n");
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printf("\n");
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}
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static void remove_arg(int *argc, char *argv[], int index) {
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for (int i = index; i < *argc - 1; i++) {
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argv[i] = argv[i + 1];
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}
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(*argc)--;
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argv[*argc] = NULL;
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}
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int main(int argc, char *argv[]) {
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int ret = EXIT_FAILURE;
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char *bootloader = NULL;
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FILE *bootloader_file = NULL;
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bool quiet = false;
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bool reset = false;
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for (int i = 1; i < argc; i++) {
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if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) {
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usage(argv[0]);
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return EXIT_SUCCESS;
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} else if (strcmp(argv[i], "--quiet") == 0) {
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remove_arg(&argc, argv, i);
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quiet = true;
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} else if (strcmp(argv[i], "--reset") == 0) {
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remove_arg(&argc, argv, i);
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reset = true;
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}
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}
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if (argc <= (reset ? 1 : 2)) {
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usage(argv[0]);
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#ifdef IS_WINDOWS
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system("pause");
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#endif
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return EXIT_FAILURE;
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}
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if (!reset && strlen(argv[2]) != 128) {
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fprintf(stderr, "ERROR: BLAKE2B specified is not 128 characters long\n");
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goto cleanup;
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}
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bootloader_file = fopen(argv[1], "r+b");
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if (bootloader_file == NULL) {
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perror("ERROR");
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goto cleanup;;
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}
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if (fseek(bootloader_file, 0, SEEK_END) != 0) {
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perror("ERROR");
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goto cleanup;
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}
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size_t bootloader_size = ftell(bootloader_file);
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rewind(bootloader_file);
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bootloader = malloc(bootloader_size);
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if (bootloader == NULL) {
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perror("ERROR");
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goto cleanup;
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}
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if (fread(bootloader, bootloader_size, 1, bootloader_file) != 1) {
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perror("ERROR");
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goto cleanup;
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}
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char *checksum_loc = NULL;
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size_t checked_count = 0;
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const char *config_b2sum_sign = CONFIG_B2SUM_SIGNATURE;
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for (size_t i = 0; i < bootloader_size - ((sizeof(CONFIG_B2SUM_SIGNATURE) - 1) + 128) + 1; i++) {
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if (bootloader[i] != config_b2sum_sign[checked_count]) {
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checked_count = 0;
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continue;
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}
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checked_count++;
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if (checked_count == sizeof(CONFIG_B2SUM_SIGNATURE) - 1) {
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checksum_loc = &bootloader[i + 1];
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break;
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}
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}
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if (checksum_loc == NULL) {
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fprintf(stderr, "ERROR: Checksum location not found in provided executable\n");
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goto cleanup;
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}
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if (!reset) {
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memcpy(checksum_loc, argv[2], 128);
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} else {
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memset(checksum_loc, '0', 128);
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}
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if (fseek(bootloader_file, 0, SEEK_SET) != 0) {
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perror("ERROR");
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goto cleanup;
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}
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if (fwrite(bootloader, bootloader_size, 1, bootloader_file) != 1) {
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perror("ERROR");
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goto cleanup;
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}
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if (!quiet) {
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fprintf(stderr, "Config file BLAKE2B successfully %s!\n", reset ? "reset" : "enrolled");
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}
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ret = EXIT_SUCCESS;
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cleanup:
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if (bootloader != NULL) {
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free(bootloader);
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}
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if (bootloader_file != NULL) {
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fclose(bootloader_file);
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}
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return ret;
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}
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