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-rw-r--r--utility/vbutil_ec.c327
1 files changed, 327 insertions, 0 deletions
diff --git a/utility/vbutil_ec.c b/utility/vbutil_ec.c
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+/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Verified boot utility for EC firmware
+ */
+
+#include <getopt.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "cryptolib.h"
+#include "host_common.h"
+#include "vboot_common.h"
+
+
+/* Command line options */
+enum {
+ OPT_MODE_VBLOCK = 1000,
+ OPT_MODE_VERIFY,
+ OPT_KEYBLOCK,
+ OPT_SIGNPUBKEY,
+ OPT_SIGNPRIVATE,
+ OPT_VERSION,
+ OPT_FV,
+ OPT_KERNELKEY,
+ OPT_FLAGS,
+ OPT_NAME,
+};
+
+static struct option long_opts[] = {
+ {"vblock", 1, 0, OPT_MODE_VBLOCK },
+ {"verify", 1, 0, OPT_MODE_VERIFY },
+ {"keyblock", 1, 0, OPT_KEYBLOCK },
+ {"signpubkey", 1, 0, OPT_SIGNPUBKEY },
+ {"signprivate", 1, 0, OPT_SIGNPRIVATE },
+ {"version", 1, 0, OPT_VERSION },
+ {"fv", 1, 0, OPT_FV },
+ {"flags", 1, 0, OPT_FLAGS },
+ {"name", 1, 0, OPT_NAME },
+ {NULL, 0, 0, 0}
+};
+
+
+/* Print help and return error */
+static int PrintHelp(void) {
+
+ puts("vbutil_ec - Verified boot signing utility for EC firmware\n"
+ "\n"
+ "Usage: vbutil_ec <--vblock|--verify> <file> [OPTIONS]\n"
+ "\n"
+ "For '--vblock <file>', required OPTIONS are:\n"
+ " --keyblock <file> Key block in .keyblock format\n"
+ " --signprivate <file> Signing private key in .vbprivk format\n"
+ " --version <number> Firmware version\n"
+ " --fv <file> Firmware volume to sign\n"
+ "optional OPTIONS are:\n"
+ " --flags <number> Preamble flags (defaults to 0)\n"
+ " --name <string> Human-readable description\n"
+ "\n"
+ "For '--verify <file>', required OPTIONS are:\n"
+ " --fv <file> Firmware volume to verify\n"
+ "optional OPTIONS are:\n"
+ " --signpubkey <file> Signing public key in .vbpubk format\n"
+ "\n");
+ return 1;
+}
+
+
+/* Create an EC firmware .vblock */
+static int Vblock(const char* outfile, const char* keyblock_file,
+ const char* signprivate, uint64_t version,
+ const char* fv_file, uint32_t preamble_flags,
+ const char* name) {
+ VbPrivateKey* signing_key;
+ VbSignature* body_digest;
+ VbECPreambleHeader* preamble;
+ VbKeyBlockHeader* key_block;
+ uint64_t key_block_size;
+ uint8_t* fv_data;
+ uint64_t fv_size;
+ FILE* f;
+ uint64_t i;
+
+ if (!outfile)
+ VbExError("Must specify output filename\n");
+
+ if (!keyblock_file || !signprivate)
+ VbExError("Must specify all keys\n");
+
+ if (!fv_file)
+ VbExError("Must specify firmware volume\n");
+
+ /* Read the key block and keys */
+ key_block = (VbKeyBlockHeader*)ReadFile(keyblock_file, &key_block_size);
+ if (!key_block)
+ VbExError("Error reading key block.\n");
+
+ signing_key = PrivateKeyRead(signprivate);
+ if (!signing_key)
+ VbExError("Error reading signing key.\n");
+
+ /* Read and sign the firmware volume */
+ fv_data = ReadFile(fv_file, &fv_size);
+ if (!fv_data)
+ return 1;
+ if (!fv_size)
+ VbExError("Empty firmware volume file\n");
+
+ if (name && strlen(name)+1 > sizeof(preamble->name))
+ VbExError("Name string is too long\n");
+
+ body_digest = CalculateHash(fv_data, fv_size, signing_key);
+ if (!body_digest)
+ VbExError("Error calculating body digest\n");
+ free(fv_data);
+
+ /* Create preamble */
+ preamble = CreateECPreamble(version, body_digest, signing_key,
+ preamble_flags, name);
+ if (!preamble)
+ VbExError("Error creating preamble.\n");
+
+ /* Write the output file */
+ f = fopen(outfile, "wb");
+ if (!f)
+ VbExError("Can't open output file %s\n", outfile);
+
+ i = ((1 != fwrite(key_block, key_block_size, 1, f)) ||
+ (1 != fwrite(preamble, preamble->preamble_size, 1, f)));
+ fclose(f);
+ if (i) {
+ unlink(outfile);
+ VbExError("Can't write output file %s\n", outfile);
+ }
+
+ /* Success */
+ return 0;
+}
+
+static int Verify(const char* infile,
+ const char* signpubkey,
+ const char* fv_file) {
+ VbKeyBlockHeader* key_block;
+ VbECPreambleHeader* preamble;
+ VbPublicKey* data_key;
+ VbPublicKey* sign_key = 0;
+ RSAPublicKey* rsa;
+ uint8_t* blob;
+ uint64_t blob_size;
+ uint8_t* fv_data;
+ uint64_t fv_size;
+ uint64_t now = 0;
+
+ if (!infile || !fv_file) {
+ VbExError("Must specify filename and fv\n");
+ return 1;
+ }
+
+ /* Read public signing key */
+ if (signpubkey) {
+ sign_key = PublicKeyRead(signpubkey);
+ if (!sign_key)
+ VbExError("Error reading signpubkey.\n");
+ } else {
+ printf("WARNING: No public key given - signature is not checked\n");
+ }
+
+ /* Read blob */
+ blob = ReadFile(infile, &blob_size);
+ if (!blob)
+ VbExError("Error reading input file\n");
+
+ /* Read firmware volume */
+ fv_data = ReadFile(fv_file, &fv_size);
+ if (!fv_data)
+ VbExError("Error reading firmware volume\n");
+
+ /* Verify key block */
+ key_block = (VbKeyBlockHeader*)blob;
+ if (0 != KeyBlockVerify(key_block, blob_size, sign_key, !signpubkey))
+ VbExError("Error verifying key block.\n");
+
+ if (sign_key)
+ free(sign_key);
+ now += key_block->key_block_size;
+
+ printf("Key block:\n");
+ data_key = &key_block->data_key;
+ printf(" Size: %" PRIu64 "\n", key_block->key_block_size);
+ printf(" Flags: %" PRIu64 " (ignored)\n",
+ key_block->key_block_flags);
+ printf(" Data key algorithm: %" PRIu64 " %s\n", data_key->algorithm,
+ (data_key->algorithm < kNumAlgorithms ?
+ algo_strings[data_key->algorithm] : "(invalid)"));
+ printf(" Data key version: %" PRIu64 "\n", data_key->key_version);
+ printf(" Data key sha1sum: ");
+ PrintPubKeySha1Sum(data_key);
+ printf("\n");
+
+ rsa = PublicKeyToRSA(&key_block->data_key);
+ if (!rsa)
+ VbExError("Error parsing data key.\n");
+
+ /* Verify preamble */
+ preamble = (VbECPreambleHeader*)(blob + now);
+ if (0 != VerifyECPreamble(preamble, blob_size - now, rsa))
+ VbExError("Error verifying preamble.\n");
+
+ now += preamble->preamble_size;
+
+ printf("Preamble:\n");
+ printf(" Size: %" PRIu64 "\n", preamble->preamble_size);
+ printf(" Header version: %" PRIu32 ".%" PRIu32"\n",
+ preamble->header_version_major, preamble->header_version_minor);
+ printf(" Firmware version: %" PRIu64 "\n", preamble->firmware_version);
+ printf(" Firmware body size: %" PRIu64 "\n",
+ preamble->body_digest.data_size);
+ printf(" Preamble flags: %" PRIu32 "\n", preamble->flags);
+ printf(" Preamble name: %s\n", preamble->name);
+
+ /* TODO: verify body size same as signature size */
+
+ /* Verify body */
+ if (preamble->flags & VB_FIRMWARE_PREAMBLE_USE_RO_NORMAL) {
+ printf("Preamble requests USE_RO_NORMAL; skipping body verification.\n");
+ } else {
+ if (0 != EqualData(fv_data, fv_size, &preamble->body_digest, rsa))
+ VbExError("Error verifying firmware body.\n");
+ printf("Body verification succeeded.\n");
+ }
+
+ return 0;
+}
+
+
+int main(int argc, char* argv[]) {
+
+ char* filename = NULL;
+ char* key_block_file = NULL;
+ char* signpubkey = NULL;
+ char* signprivate = NULL;
+ uint64_t version = 0;
+ int got_version = 0;
+ char* fv_file = NULL;
+ uint32_t preamble_flags = 0;
+ char *name = NULL;
+ int mode = 0;
+ int parse_error = 0;
+ char* e;
+ int i;
+
+ while ((i = getopt_long(argc, argv, "", long_opts, NULL)) != -1) {
+ switch (i) {
+ case '?':
+ /* Unhandled option */
+ printf("Unknown option\n");
+ parse_error = 1;
+ break;
+
+ case OPT_MODE_VBLOCK:
+ case OPT_MODE_VERIFY:
+ mode = i;
+ filename = optarg;
+ break;
+
+ case OPT_KEYBLOCK:
+ key_block_file = optarg;
+ break;
+
+ case OPT_SIGNPUBKEY:
+ signpubkey = optarg;
+ break;
+
+ case OPT_SIGNPRIVATE:
+ signprivate = optarg;
+ break;
+
+ case OPT_FV:
+ fv_file = optarg;
+ break;
+
+ case OPT_VERSION:
+ version = strtoul(optarg, &e, 0);
+ if (!*optarg || (e && *e)) {
+ printf("Invalid --version\n");
+ parse_error = 1;
+ }
+ got_version = 1;
+ break;
+
+ case OPT_FLAGS:
+ preamble_flags = strtoul(optarg, &e, 0);
+ if (!*optarg || (e && *e)) {
+ printf("Invalid --flags\n");
+ parse_error = 1;
+ }
+ break;
+
+ case OPT_NAME:
+ name = optarg;
+ break;
+ }
+ }
+
+ if (parse_error)
+ return PrintHelp();
+
+ switch(mode) {
+ case OPT_MODE_VBLOCK:
+ if (!got_version) {
+ printf("Must specify a version\n");
+ return PrintHelp();
+ }
+ return Vblock(filename, key_block_file, signprivate, version,
+ fv_file, preamble_flags, name);
+ case OPT_MODE_VERIFY:
+ return Verify(filename, signpubkey, fv_file);
+ default:
+ printf("Must specify a mode.\n");
+ return PrintHelp();
+ }
+}
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