| // Copyright (c) 2010 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. |
| // |
| // Utility for manipulating verified boot kernel images. |
| // |
| |
| #include "kernel_utility.h" |
| |
| #include <errno.h> |
| #include <getopt.h> |
| #include <stdio.h> |
| #include <stdint.h> // Needed for UINT16_MAX. |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #include <iostream> |
| |
| extern "C" { |
| #include "cryptolib.h" |
| #include "file_keys.h" |
| #include "kernel_image.h" |
| #include "utility.h" |
| } |
| |
| extern int errno; |
| using std::cerr; |
| |
| namespace vboot_reference { |
| |
| KernelUtility::KernelUtility(): image_(NULL), |
| firmware_key_pub_(NULL), |
| header_version_(1), |
| firmware_sign_algorithm_(-1), |
| kernel_sign_algorithm_(-1), |
| kernel_key_version_(-1), |
| kernel_version_(-1), |
| is_generate_(false), |
| is_verify_(false), |
| is_describe_(false){ |
| // Populate kernel config options with defaults. |
| options_.version[0] = 1; |
| options_.version[1] = 0; |
| options_.kernel_len = 0; |
| options_.kernel_load_addr = 0; |
| options_.kernel_entry_addr = 0; |
| } |
| |
| KernelUtility::~KernelUtility() { |
| RSAPublicKeyFree(firmware_key_pub_); |
| KernelImageFree(image_); |
| } |
| |
| void KernelUtility::PrintUsage(void) { |
| cerr << |
| "Utility to generate/verify/describe a verified boot kernel image\n\n" |
| "Usage: kernel_utility <--generate|--verify|--describe> [OPTIONS]\n\n" |
| "For \"--verify\", required OPTIONS are:\n" |
| "--in <infile>\t\t\tVerified boot kernel image to verify.\n" |
| "--firmware_key_pub <pubkeyfile>\tPre-processed public firmware key " |
| "to use for verification.\n\n" |
| "For \"--generate\", required OPTIONS are:\n" |
| "--firmware_key <privkeyfile>\tPrivate firmware signing key file\n" |
| "--kernel_key <privkeyfile>\tPrivate kernel signing key file\n" |
| "--kernel_key_pub <pubkeyfile>\tPre-processed public kernel signing" |
| " key\n" |
| "--firmware_sign_algorithm <algoid>\tSigning algorithm used by " |
| "the firmware\n" |
| "--kernel_sign_algorithm <algoid>\tSigning algorithm to use for kernel\n" |
| "--kernel_key_version <version#>\tKernel signing Key Version#\n" |
| "--kernel_version <version#>\tKernel Version#\n" |
| "--in <infile>\t\tKernel Image to sign\n" |
| "--out <outfile>\t\tOutput file for verified boot Kernel image\n\n" |
| "Optional arguments for \"--generate\" include:\n" |
| "--config_version <version>\n" |
| "--kernel_load_addr <addr>\n" |
| "--kernel_entry_addr <addr>\n\n" |
| "<algoid> (for --*_sign_algorithm) is one of the following:\n"; |
| for (int i = 0; i < kNumAlgorithms; i++) { |
| cerr << i << " for " << algo_strings[i] << "\n"; |
| } |
| cerr << "\n\n"; |
| } |
| |
| bool KernelUtility::ParseCmdLineOptions(int argc, char* argv[]) { |
| int option_index; |
| static struct option long_options[] = { |
| {"firmware_key", 1, 0, 0}, |
| {"firmware_key_pub", 1, 0, 0}, |
| {"kernel_key", 1, 0, 0}, |
| {"kernel_key_pub", 1, 0, 0}, |
| {"firmware_sign_algorithm", 1, 0, 0}, |
| {"kernel_sign_algorithm", 1, 0, 0}, |
| {"kernel_key_version", 1, 0, 0}, |
| {"kernel_version", 1, 0, 0}, |
| {"in", 1, 0, 0}, |
| {"out", 1, 0, 0}, |
| {"generate", 0, 0, 0}, |
| {"verify", 0, 0, 0}, |
| {"config_version", 1, 0, 0}, |
| {"kernel_load_addr", 1, 0, 0}, |
| {"kernel_entry_addr", 1, 0, 0}, |
| {"describe", 0, 0, 0}, |
| {NULL, 0, 0, 0} |
| }; |
| while (1) { |
| int i = getopt_long(argc, argv, "", long_options, &option_index); |
| if (-1 == i) // Done with option processing. |
| break; |
| if ('?' == i) // Invalid option found. |
| return false; |
| |
| if (0 == i) { |
| switch (option_index) { |
| case 0: // firmware_key |
| firmware_key_file_ = optarg; |
| break; |
| case 1: // firmware_key_pub |
| firmware_key_pub_file_ = optarg; |
| break; |
| case 2: // kernel_key |
| kernel_key_file_ = optarg; |
| break; |
| case 3: // kernel_key_pub |
| kernel_key_pub_file_ = optarg; |
| break; |
| case 4: // firmware_sign_algorithm |
| errno = 0; // strtol() returns an error via errno |
| firmware_sign_algorithm_ = strtol(optarg, |
| reinterpret_cast<char**>(NULL), 10); |
| if (errno) |
| return false; |
| break; |
| case 5: // kernel_sign_algorithm |
| errno = 0; |
| kernel_sign_algorithm_ = strtol(optarg, |
| reinterpret_cast<char**>(NULL), 10); |
| if (errno) |
| return false; |
| break; |
| case 6: // kernel_key_version |
| errno = 0; |
| kernel_key_version_ = strtol(optarg, |
| reinterpret_cast<char**>(NULL), 10); |
| if (errno) |
| return false; |
| break; |
| case 7: // kernel_version |
| errno = 0; |
| kernel_version_ = strtol(optarg, |
| reinterpret_cast<char**>(NULL), 10); |
| if (errno) |
| return false; |
| break; |
| case 8: // in |
| in_file_ = optarg; |
| break; |
| case 9: // out |
| out_file_ = optarg; |
| break; |
| case 10: // generate |
| is_generate_ = true; |
| break; |
| case 11: // verify |
| is_verify_ = true; |
| break; |
| case 12: // config_version |
| if (2 != sscanf(optarg, "%d.%d", &options_.version[0], |
| &options_.version[1])) |
| return false; |
| break; |
| case 13: // kernel_load_addr |
| errno = 0; |
| options_.kernel_load_addr = |
| strtol(optarg, reinterpret_cast<char**>(NULL), 10); |
| if (errno) |
| return false; |
| break; |
| case 14: // kernel_entry_addr |
| errno = 0; |
| options_.kernel_entry_addr = |
| strtol(optarg, reinterpret_cast<char**>(NULL), 10); |
| if (errno) |
| return false; |
| break; |
| case 15: // describe |
| is_describe_ = true; |
| break; |
| } |
| } |
| } |
| return CheckOptions(); |
| } |
| |
| void KernelUtility::OutputSignedImage(void) { |
| if (image_) { |
| if (!WriteKernelImage(out_file_.c_str(), image_)) { |
| cerr << "Couldn't write verified boot kernel image to file " |
| << out_file_ <<".\n"; |
| } |
| } |
| } |
| |
| void KernelUtility::DescribeSignedImage(void) { |
| image_ = ReadKernelImage(in_file_.c_str()); |
| if (!image_) { |
| cerr << "Couldn't read kernel image or malformed image.\n"; |
| return; |
| } |
| PrintKernelImage(image_); |
| } |
| |
| bool KernelUtility::GenerateSignedImage(void) { |
| uint64_t kernel_key_pub_len; |
| image_ = KernelImageNew(); |
| |
| Memcpy(image_->magic, KERNEL_MAGIC, KERNEL_MAGIC_SIZE); |
| |
| // TODO(gauravsh): make this a command line option. |
| image_->header_version = 1; |
| image_->firmware_sign_algorithm = (uint16_t) firmware_sign_algorithm_; |
| // Copy pre-processed public signing key. |
| image_->kernel_sign_algorithm = (uint16_t) kernel_sign_algorithm_; |
| image_->kernel_sign_key = BufferFromFile(kernel_key_pub_file_.c_str(), |
| &kernel_key_pub_len); |
| if (!image_->kernel_sign_key) |
| return false; |
| image_->kernel_key_version = kernel_key_version_; |
| |
| // Update header length. |
| image_->header_len = GetKernelHeaderLen(image_); |
| |
| // Calculate header checksum. |
| CalculateKernelHeaderChecksum(image_, image_->header_checksum); |
| |
| image_->kernel_version = kernel_version_; |
| image_->options.version[0] = options_.version[0]; |
| image_->options.version[1] = options_.version[1]; |
| // TODO(gauravsh): Add a command line option for this. |
| Memset(image_->options.cmd_line, 0, sizeof(image_->options.cmd_line)); |
| image_->options.kernel_load_addr = options_.kernel_load_addr; |
| image_->options.kernel_entry_addr = options_.kernel_entry_addr; |
| image_->kernel_data = BufferFromFile(in_file_.c_str(), |
| &image_->options.kernel_len); |
| if (!image_) |
| return false; |
| // Generate and add the signatures. |
| if (!AddKernelKeySignature(image_, firmware_key_file_.c_str())) { |
| cerr << "Couldn't write key signature to verified boot kernel image.\n"; |
| return false; |
| } |
| |
| if (!AddKernelSignature(image_, kernel_key_file_.c_str())) { |
| cerr << "Couldn't write firmware signature to verified boot kernel image.\n"; |
| return false; |
| } |
| return true; |
| } |
| |
| bool KernelUtility::VerifySignedImage(void) { |
| int error; |
| firmware_key_pub_ = RSAPublicKeyFromFile(firmware_key_pub_file_.c_str()); |
| image_ = ReadKernelImage(in_file_.c_str()); |
| |
| if (!firmware_key_pub_) { |
| cerr << "Couldn't read pre-processed public root key.\n"; |
| return false; |
| } |
| |
| if (!image_) { |
| cerr << "Couldn't read kernel image or malformed image.\n"; |
| return false; |
| } |
| if (!(error = VerifyKernelImage(firmware_key_pub_, image_, 0))) |
| return true; |
| cerr << VerifyKernelErrorString(error) << "\n"; |
| return false; |
| } |
| |
| bool KernelUtility::CheckOptions(void) { |
| // Ensure that only one of --{describe|generate|verify} is set. |
| if (!((is_describe_ && !is_generate_ && !is_verify_) || |
| (!is_describe_ && is_generate_ && !is_verify_) || |
| (!is_describe_ && !is_generate_ && is_verify_))) { |
| cerr << "One (and only one) of --describe, --generate or --verify " |
| << "must be specified.\n"; |
| return false; |
| } |
| // Common required options. |
| if (in_file_.empty()) { |
| cerr << "No input file specified.\n"; |
| return false; |
| } |
| // Required options for --verify. |
| if (is_verify_ && firmware_key_pub_file_.empty()) { |
| cerr << "No pre-processed public firmware key file specified.\n"; |
| return false; |
| } |
| // Required options for --generate. |
| if (is_generate_) { |
| if (firmware_key_file_.empty()) { |
| cerr << "No firmware key file specified.\n"; |
| return false; |
| } |
| if (kernel_key_file_.empty()) { |
| cerr << "No kernel key file specified.\n"; |
| return false; |
| } |
| if (kernel_key_pub_file_.empty()) { |
| cerr << "No pre-processed public kernel key file specified\n"; |
| return false; |
| } |
| if (kernel_key_version_ <= 0 || kernel_key_version_ > UINT16_MAX) { |
| cerr << "Invalid or no kernel key version specified.\n"; |
| return false; |
| } |
| if (firmware_sign_algorithm_ < 0 || |
| firmware_sign_algorithm_ >= kNumAlgorithms) { |
| cerr << "Invalid or no firmware signing key algorithm specified.\n"; |
| return false; |
| } |
| if (kernel_sign_algorithm_ < 0 || |
| kernel_sign_algorithm_ >= kNumAlgorithms) { |
| cerr << "Invalid or no kernel signing key algorithm specified.\n"; |
| return false; |
| } |
| if (kernel_version_ <=0 || kernel_version_ > UINT16_MAX) { |
| cerr << "Invalid or no kernel version specified.\n"; |
| return false; |
| } |
| if (out_file_.empty()) { |
| cerr <<"No output file specified.\n"; |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| } // namespace vboot_reference |
| |
| int main(int argc, char* argv[]) { |
| vboot_reference::KernelUtility ku; |
| if (!ku.ParseCmdLineOptions(argc, argv)) { |
| ku.PrintUsage(); |
| return -1; |
| } |
| if (ku.is_describe()) { |
| ku.DescribeSignedImage(); |
| } |
| else if (ku.is_generate()) { |
| if (!ku.GenerateSignedImage()) |
| return -1; |
| ku.OutputSignedImage(); |
| } |
| else if (ku.is_verify()) { |
| cerr << "Verification "; |
| if (ku.VerifySignedImage()) |
| cerr << "SUCCESS.\n"; |
| else |
| cerr << "FAILURE.\n"; |
| } |
| return 0; |
| } |