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https://github.com/Telecominfraproject/OpenCellular.git
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a712e01ae7
The old (v2.0) parser is compatible with new (v2.1) structs. That is, this won't break existing firmware or vbutil_firmware. A new (v2.1) parser parsing an old (v2.0) struct will return 0 for the flags. This will be used to support the RO-normal code path in a subsequent CL. BUG=chromium-os:17304 TEST=added unit tests; make && make runtests Change-Id: I73bcd8acd3330b0d7d143061b5ef838e6d79cf1a Reviewed-on: http://gerrit.chromium.org/gerrit/4030 Reviewed-by: Bill Richardson <wfrichar@chromium.org> Tested-by: Randall Spangler <rspangler@chromium.org>
368 lines
10 KiB
C
368 lines
10 KiB
C
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Verified boot firmware utility
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*/
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#include <getopt.h>
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#include <inttypes.h> /* For PRIu64 */
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "cryptolib.h"
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#include "host_common.h"
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#include "kernel_blob.h"
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#include "vboot_common.h"
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/* Command line options */
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enum {
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OPT_MODE_VBLOCK = 1000,
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OPT_MODE_VERIFY,
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OPT_KEYBLOCK,
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OPT_SIGNPUBKEY,
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OPT_SIGNPRIVATE,
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OPT_VERSION,
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OPT_FV,
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OPT_KERNELKEY,
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OPT_FLAGS,
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};
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static struct option long_opts[] = {
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{"vblock", 1, 0, OPT_MODE_VBLOCK },
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{"verify", 1, 0, OPT_MODE_VERIFY },
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{"keyblock", 1, 0, OPT_KEYBLOCK },
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{"signpubkey", 1, 0, OPT_SIGNPUBKEY },
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{"signprivate", 1, 0, OPT_SIGNPRIVATE },
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{"version", 1, 0, OPT_VERSION },
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{"fv", 1, 0, OPT_FV },
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{"kernelkey", 1, 0, OPT_KERNELKEY },
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{"flags", 1, 0, OPT_FLAGS },
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{NULL, 0, 0, 0}
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};
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/* Print help and return error */
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static int PrintHelp(void) {
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puts("vbutil_firmware - Verified boot key block utility\n"
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"\n"
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"Usage: vbutil_firmware <--vblock|--verify> <file> [OPTIONS]\n"
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"\n"
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"For '--vblock <file>', required OPTIONS are:\n"
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" --keyblock <file> Key block in .keyblock format\n"
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" --signprivate <file> Signing private key in .vbprivk format\n"
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" --version <number> Firmware version\n"
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" --fv <file> Firmware volume to sign\n"
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" --kernelkey <file> Kernel subkey in .vbpubk format\n"
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"optional OPTIONS are:\n"
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" --flags <number> Preamble flags (defaults to 0)\n"
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"\n"
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"For '--verify <file>', required OPTIONS are:\n"
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" --signpubkey <file> Signing public key in .vbpubk format\n"
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" --fv <file> Firmware volume to verify\n"
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"\n"
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"For '--verify <file>', optional OPTIONS are:\n"
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" --kernelkey <file> Write the kernel subkey to this file\n"
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"");
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return 1;
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}
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/* Create a firmware .vblock */
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static int Vblock(const char* outfile, const char* keyblock_file,
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const char* signprivate, uint64_t version,
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const char* fv_file, const char* kernelkey_file,
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uint32_t preamble_flags) {
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VbPrivateKey* signing_key;
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VbPublicKey* kernel_subkey;
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VbSignature* body_sig;
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VbFirmwarePreambleHeader* preamble;
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VbKeyBlockHeader* key_block;
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uint64_t key_block_size;
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uint8_t* fv_data;
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uint64_t fv_size;
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FILE* f;
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uint64_t i;
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if (!outfile) {
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VbExError("Must specify output filename\n");
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return 1;
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}
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if (!keyblock_file || !signprivate || !kernelkey_file) {
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VbExError("Must specify all keys\n");
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return 1;
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}
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if (!fv_file) {
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VbExError("Must specify firmware volume\n");
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return 1;
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}
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/* Read the key block and keys */
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key_block = (VbKeyBlockHeader*)ReadFile(keyblock_file, &key_block_size);
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if (!key_block) {
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VbExError("Error reading key block.\n");
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return 1;
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}
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signing_key = PrivateKeyRead(signprivate);
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if (!signing_key) {
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VbExError("Error reading signing key.\n");
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return 1;
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}
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kernel_subkey = PublicKeyRead(kernelkey_file);
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if (!kernel_subkey) {
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VbExError("Error reading kernel subkey.\n");
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return 1;
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}
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/* Read and sign the firmware volume */
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fv_data = ReadFile(fv_file, &fv_size);
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if (!fv_data)
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return 1;
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if (!fv_size) {
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VbExError("Empty firmware volume file\n");
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return 1;
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}
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body_sig = CalculateSignature(fv_data, fv_size, signing_key);
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if (!body_sig) {
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VbExError("Error calculating body signature\n");
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return 1;
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}
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free(fv_data);
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/* Create preamble */
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preamble = CreateFirmwarePreamble(version,
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kernel_subkey,
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body_sig,
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signing_key,
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preamble_flags);
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if (!preamble) {
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VbExError("Error creating preamble.\n");
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return 1;
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}
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/* Write the output file */
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f = fopen(outfile, "wb");
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if (!f) {
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VbExError("Can't open output file %s\n", outfile);
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return 1;
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}
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i = ((1 != fwrite(key_block, key_block_size, 1, f)) ||
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(1 != fwrite(preamble, preamble->preamble_size, 1, f)));
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fclose(f);
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if (i) {
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VbExError("Can't write output file %s\n", outfile);
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unlink(outfile);
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return 1;
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}
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/* Success */
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return 0;
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}
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static int Verify(const char* infile, const char* signpubkey,
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const char* fv_file, const char* kernelkey_file) {
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VbKeyBlockHeader* key_block;
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VbFirmwarePreambleHeader* preamble;
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VbPublicKey* data_key;
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VbPublicKey* sign_key;
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VbPublicKey* kernel_subkey;
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RSAPublicKey* rsa;
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uint8_t* blob;
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uint64_t blob_size;
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uint8_t* fv_data;
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uint64_t fv_size;
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uint64_t now = 0;
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if (!infile || !signpubkey || !fv_file) {
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VbExError("Must specify filename, signpubkey, and fv\n");
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return 1;
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}
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/* Read public signing key */
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sign_key = PublicKeyRead(signpubkey);
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if (!sign_key) {
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VbExError("Error reading signpubkey.\n");
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return 1;
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}
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/* Read blob */
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blob = ReadFile(infile, &blob_size);
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if (!blob) {
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VbExError("Error reading input file\n");
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return 1;
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}
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/* Read firmware volume */
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fv_data = ReadFile(fv_file, &fv_size);
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if (!fv_data) {
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VbExError("Error reading firmware volume\n");
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return 1;
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}
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/* Verify key block */
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key_block = (VbKeyBlockHeader*)blob;
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if (0 != KeyBlockVerify(key_block, blob_size, sign_key, 0)) {
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VbExError("Error verifying key block.\n");
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return 1;
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}
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free(sign_key);
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now += key_block->key_block_size;
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printf("Key block:\n");
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data_key = &key_block->data_key;
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printf(" Size: %" PRIu64 "\n", key_block->key_block_size);
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printf(" Flags: %" PRIu64 " (ignored)\n",
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key_block->key_block_flags);
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printf(" Data key algorithm: %" PRIu64 " %s\n", data_key->algorithm,
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(data_key->algorithm < kNumAlgorithms ?
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algo_strings[data_key->algorithm] : "(invalid)"));
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printf(" Data key version: %" PRIu64 "\n", data_key->key_version);
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printf(" Data key sha1sum: ");
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PrintPubKeySha1Sum(data_key);
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printf("\n");
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rsa = PublicKeyToRSA(&key_block->data_key);
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if (!rsa) {
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VbExError("Error parsing data key.\n");
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return 1;
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}
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/* Verify preamble */
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preamble = (VbFirmwarePreambleHeader*)(blob + now);
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if (0 != VerifyFirmwarePreamble(preamble, blob_size - now, rsa)) {
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VbExError("Error verifying preamble.\n");
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return 1;
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}
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now += preamble->preamble_size;
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printf("Preamble:\n");
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printf(" Size: %" PRIu64 "\n", preamble->preamble_size);
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printf(" Header version: %" PRIu32 ".%" PRIu32"\n",
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preamble->header_version_major, preamble->header_version_minor);
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printf(" Firmware version: %" PRIu64 "\n", preamble->firmware_version);
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kernel_subkey = &preamble->kernel_subkey;
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printf(" Kernel key algorithm: %" PRIu64 " %s\n",
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kernel_subkey->algorithm,
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(kernel_subkey->algorithm < kNumAlgorithms ?
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algo_strings[kernel_subkey->algorithm] : "(invalid)"));
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printf(" Kernel key version: %" PRIu64 "\n",
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kernel_subkey->key_version);
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printf(" Kernel key sha1sum: ");
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PrintPubKeySha1Sum(kernel_subkey);
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printf("\n");
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printf(" Firmware body size: %" PRIu64 "\n",
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preamble->body_signature.data_size);
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printf(" Preamble flags: %" PRIu32 "\n",
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VbGetFirmwarePreambleFlags(preamble));
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/* TODO: verify body size same as signature size */
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/* Verify body */
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if (0 != VerifyData(fv_data, fv_size, &preamble->body_signature, rsa)) {
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VbExError("Error verifying firmware body.\n");
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return 1;
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}
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printf("Body verification succeeded.\n");
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if (kernelkey_file) {
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if (0 != PublicKeyWrite(kernelkey_file, kernel_subkey)) {
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fprintf(stderr,
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"vbutil_firmware: unable to write kernel subkey\n");
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return 1;
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}
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}
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return 0;
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}
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int main(int argc, char* argv[]) {
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char* filename = NULL;
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char* key_block_file = NULL;
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char* signpubkey = NULL;
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char* signprivate = NULL;
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uint64_t version = 0;
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char* fv_file = NULL;
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char* kernelkey_file = NULL;
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uint32_t preamble_flags = 0;
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int mode = 0;
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int parse_error = 0;
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char* e;
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int i;
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while ((i = getopt_long(argc, argv, "", long_opts, NULL)) != -1) {
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switch (i) {
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case '?':
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/* Unhandled option */
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printf("Unknown option\n");
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parse_error = 1;
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break;
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case OPT_MODE_VBLOCK:
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case OPT_MODE_VERIFY:
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mode = i;
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filename = optarg;
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break;
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case OPT_KEYBLOCK:
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key_block_file = optarg;
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break;
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case OPT_SIGNPUBKEY:
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signpubkey = optarg;
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break;
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case OPT_SIGNPRIVATE:
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signprivate = optarg;
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break;
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case OPT_FV:
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fv_file = optarg;
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break;
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case OPT_KERNELKEY:
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kernelkey_file = optarg;
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break;
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case OPT_VERSION:
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version = strtoul(optarg, &e, 0);
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if (!*optarg || (e && *e)) {
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printf("Invalid --version\n");
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parse_error = 1;
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}
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break;
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case OPT_FLAGS:
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preamble_flags = strtoul(optarg, &e, 0);
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if (!*optarg || (e && *e)) {
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printf("Invalid --flags\n");
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parse_error = 1;
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}
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break;
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}
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}
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if (parse_error)
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return PrintHelp();
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switch(mode) {
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case OPT_MODE_VBLOCK:
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return Vblock(filename, key_block_file, signprivate, version, fv_file,
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kernelkey_file, preamble_flags);
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case OPT_MODE_VERIFY:
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return Verify(filename, signpubkey, fv_file, kernelkey_file);
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default:
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printf("Must specify a mode.\n");
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return PrintHelp();
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}
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}
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