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VBoot Reference: Refactor Pass 1: Split {firmware|kernel}_image
This CL refactors verified boot firmware and kernel image functions into firmware and userland portions. Data Types and Functions that need to be a part of the final firmware implementation reside in files with "_fw" suffix - firmware_image_fw.{c|h} and kernel_image_fw.{c|h}.
Also some Makefile cleanups.
Review URL: http://codereview.chromium.org/1599001
This commit is contained in:
Gaurav Shah
@@ -3,6 +3,7 @@
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* found in the LICENSE file.
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*
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* Functions for generating and manipulating a verified boot kernel image.
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* (Userland portion)
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*/
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#include "kernel_image.h"
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@@ -75,7 +76,7 @@ KernelImage* ReadKernelImage(const char* input_file) {
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StatefulMemcpy(&st, &image->magic, KERNEL_MAGIC_SIZE);
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if (SafeMemcmp(image->magic, KERNEL_MAGIC, KERNEL_MAGIC_SIZE)) {
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fprintf(stderr, "Wrong Kernel Magic.\n");
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debug("Wrong Kernel Magic.\n");
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Free(kernel_buf);
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return NULL;
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}
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@@ -107,7 +108,7 @@ KernelImage* ReadKernelImage(const char* input_file) {
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/* Check whether key header length is correct. */
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header_len = GetKernelHeaderLen(image);
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if (header_len != image->header_len) {
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fprintf(stderr, "Header length mismatch. Got: %d, Expected: %d\n",
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debug("Header length mismatch. Got: %d, Expected: %d\n",
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image->header_len, header_len);
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Free(kernel_buf);
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return NULL;
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@@ -124,7 +125,7 @@ KernelImage* ReadKernelImage(const char* input_file) {
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CalculateKernelHeaderChecksum(image, header_checksum);
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if (SafeMemcmp(header_checksum, image->header_checksum,
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FIELD_LEN(header_checksum))) {
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fprintf(stderr, "Invalid kernel header checksum!\n");
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debug("Invalid kernel header checksum!\n");
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Free(kernel_buf);
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return NULL;
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}
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@@ -307,17 +308,17 @@ int WriteKernelImage(const char* input_file,
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if (!image)
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return 0;
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if (-1 == (fd = creat(input_file, S_IRWXU))) {
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fprintf(stderr, "Couldn't open file for writing kernel image: %s\n",
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debug("Couldn't open file for writing kernel image: %s\n",
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input_file);
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return 0;
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}
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kernel_blob = GetKernelBlob(image, &blob_len);
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if (!kernel_blob) {
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fprintf(stderr, "Couldn't create kernel blob from KernelImage.\n");
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debug("Couldn't create kernel blob from KernelImage.\n");
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return 0;
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}
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if (blob_len != write(fd, kernel_blob, blob_len)) {
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fprintf(stderr, "Couldn't write Kernel Image to file: %s\n",
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debug("Couldn't write Kernel Image to file: %s\n",
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input_file);
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Free(kernel_blob);
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@@ -361,212 +362,6 @@ void PrintKernelImage(const KernelImage* image) {
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/* TODO(gauravsh): Output kernel signature here? */
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}
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char* kVerifyKernelErrors[VERIFY_KERNEL_MAX] = {
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"Success.",
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"Invalid Image.",
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"Kernel Key Signature Failed.",
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"Invalid Kernel Verification Algorithm.",
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"Config Signature Failed.",
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"Kernel Signature Failed.",
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"Wrong Kernel Magic.",
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};
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int VerifyKernelHeader(const uint8_t* firmware_key_blob,
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const uint8_t* header_blob,
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const int dev_mode,
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int* firmware_algorithm,
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int* kernel_algorithm,
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int* kernel_header_len) {
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int kernel_sign_key_len;
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int firmware_sign_key_len;
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uint16_t header_version, header_len;
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uint16_t firmware_sign_algorithm, kernel_sign_algorithm;
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uint8_t* header_checksum = NULL;
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/* Base Offset for the header_checksum field. Actual offset is
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* this + kernel_sign_key_len. */
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int base_header_checksum_offset = (FIELD_LEN(header_version) +
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FIELD_LEN(header_len) +
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FIELD_LEN(firmware_sign_algorithm) +
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FIELD_LEN(kernel_sign_algorithm) +
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FIELD_LEN(kernel_key_version));
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Memcpy(&header_version, header_blob, sizeof(header_version));
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Memcpy(&header_len, header_blob + FIELD_LEN(header_version),
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sizeof(header_len));
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Memcpy(&firmware_sign_algorithm,
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header_blob + (FIELD_LEN(header_version) +
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FIELD_LEN(header_len)),
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sizeof(firmware_sign_algorithm));
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Memcpy(&kernel_sign_algorithm,
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header_blob + (FIELD_LEN(header_version) +
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FIELD_LEN(header_len) +
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FIELD_LEN(firmware_sign_algorithm)),
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sizeof(kernel_sign_algorithm));
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/* TODO(gauravsh): Make this return two different error types depending
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* on whether the firmware or kernel signing algorithm is invalid. */
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if (firmware_sign_algorithm >= kNumAlgorithms)
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return VERIFY_KERNEL_INVALID_ALGORITHM;
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if (kernel_sign_algorithm >= kNumAlgorithms)
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return VERIFY_KERNEL_INVALID_ALGORITHM;
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*firmware_algorithm = (int) firmware_sign_algorithm;
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*kernel_algorithm = (int) kernel_sign_algorithm;
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kernel_sign_key_len = RSAProcessedKeySize(kernel_sign_algorithm);
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firmware_sign_key_len = RSAProcessedKeySize(firmware_sign_algorithm);
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/* Verify if header len is correct? */
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if (header_len != (base_header_checksum_offset +
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kernel_sign_key_len +
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FIELD_LEN(header_checksum))) {
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fprintf(stderr, "VerifyKernelHeader: Header length mismatch\n");
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return VERIFY_KERNEL_INVALID_IMAGE;
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}
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*kernel_header_len = (int) header_len;
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/* Verify if the hash of the header is correct. */
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header_checksum = DigestBuf(header_blob,
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header_len - FIELD_LEN(header_checksum),
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SHA512_DIGEST_ALGORITHM);
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if (SafeMemcmp(header_checksum,
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header_blob + (base_header_checksum_offset +
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kernel_sign_key_len),
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FIELD_LEN(header_checksum))) {
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Free(header_checksum);
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fprintf(stderr, "VerifyKernelHeader: Invalid header hash\n");
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return VERIFY_KERNEL_INVALID_IMAGE;
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}
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Free(header_checksum);
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/* Verify kernel key signature unless we are in dev mode. */
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if (!dev_mode) {
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if (!RSAVerifyBinary_f(firmware_key_blob, NULL, /* Key to use */
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header_blob, /* Data to verify */
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header_len, /* Length of data */
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header_blob + header_len, /* Expected Signature */
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firmware_sign_algorithm))
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return VERIFY_KERNEL_KEY_SIGNATURE_FAILED;
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}
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return 0;
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}
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int VerifyKernelConfig(RSAPublicKey* kernel_sign_key,
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const uint8_t* config_blob,
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int algorithm,
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uint64_t* kernel_len) {
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uint64_t len;
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int config_len;
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config_len = GetKernelConfigLen(NULL);
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if (!RSAVerifyBinary_f(NULL, kernel_sign_key, /* Key to use */
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config_blob, /* Data to verify */
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config_len, /* Length of data */
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config_blob + config_len, /* Expected Signature */
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algorithm))
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return VERIFY_KERNEL_CONFIG_SIGNATURE_FAILED;
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Memcpy(&len,
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config_blob + (FIELD_LEN(kernel_version) + FIELD_LEN(options.version) +
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FIELD_LEN(options.cmd_line)),
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sizeof(len));
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*kernel_len = len;
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return 0;
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}
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int VerifyKernelData(RSAPublicKey* kernel_sign_key,
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const uint8_t* kernel_config_start,
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const uint8_t* kernel_data_start,
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uint64_t kernel_len,
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int algorithm) {
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int signature_len = siglen_map[algorithm];
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uint8_t* digest;
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DigestContext ctx;
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/* Since the kernel signature is computed over the kernel version, options
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* and data, which does not form a contiguous region of memory, we calculate
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* the message digest ourselves. */
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DigestInit(&ctx, algorithm);
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DigestUpdate(&ctx, kernel_config_start, GetKernelConfigLen());
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DigestUpdate(&ctx, kernel_data_start + signature_len, kernel_len);
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digest = DigestFinal(&ctx);
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if (!RSAVerifyBinaryWithDigest_f(
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NULL, kernel_sign_key, /* Key to use. */
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digest, /* Digest of the data to verify. */
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kernel_data_start, /* Expected Signature */
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algorithm)) {
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Free(digest);
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return VERIFY_KERNEL_SIGNATURE_FAILED;
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}
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Free(digest);
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return 0;
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}
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int VerifyKernel(const uint8_t* firmware_key_blob,
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const uint8_t* kernel_blob,
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const int dev_mode) {
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int error_code;
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int firmware_sign_algorithm; /* Firmware signing key algorithm. */
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int kernel_sign_algorithm; /* Kernel Signing key algorithm. */
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RSAPublicKey* kernel_sign_key;
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int kernel_sign_key_len, kernel_key_signature_len, kernel_signature_len,
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header_len;
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uint64_t kernel_len;
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const uint8_t* header_ptr; /* Pointer to header. */
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const uint8_t* kernel_sign_key_ptr; /* Pointer to signing key. */
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const uint8_t* config_ptr; /* Pointer to kernel config block. */
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const uint8_t* kernel_ptr; /* Pointer to kernel signature/data. */
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/* Note: All the offset calculations are based on struct FirmwareImage which
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* is defined in include/firmware_image.h. */
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/* Compare magic bytes. */
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if (SafeMemcmp(kernel_blob, KERNEL_MAGIC, KERNEL_MAGIC_SIZE))
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return VERIFY_KERNEL_WRONG_MAGIC;
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header_ptr = kernel_blob + KERNEL_MAGIC_SIZE;
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/* Only continue if header verification succeeds. */
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if ((error_code = VerifyKernelHeader(firmware_key_blob, header_ptr, dev_mode,
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&firmware_sign_algorithm,
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&kernel_sign_algorithm, &header_len))) {
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fprintf(stderr, "VerifyKernel: Kernel header verification failed.\n");
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return error_code; /* AKA jump to recovery. */
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}
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/* Parse signing key into RSAPublicKey structure since it is required multiple
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* times. */
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kernel_sign_key_len = RSAProcessedKeySize(kernel_sign_algorithm);
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kernel_sign_key_ptr = header_ptr + (FIELD_LEN(header_version) +
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FIELD_LEN(header_len) +
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FIELD_LEN(firmware_sign_algorithm) +
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FIELD_LEN(kernel_sign_algorithm) +
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FIELD_LEN(kernel_key_version));
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kernel_sign_key = RSAPublicKeyFromBuf(kernel_sign_key_ptr,
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kernel_sign_key_len);
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kernel_signature_len = siglen_map[kernel_sign_algorithm];
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kernel_key_signature_len = siglen_map[firmware_sign_algorithm];
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/* Only continue if config verification succeeds. */
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config_ptr = (header_ptr + header_len + kernel_key_signature_len);
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if ((error_code = VerifyKernelConfig(kernel_sign_key, config_ptr,
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kernel_sign_algorithm,
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&kernel_len))) {
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RSAPublicKeyFree(kernel_sign_key);
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return error_code; /* AKA jump to recovery. */
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}
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/* Only continue if kernel data verification succeeds. */
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kernel_ptr = (config_ptr +
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GetKernelConfigLen() + /* Skip config block/signature. */
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kernel_signature_len);
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if ((error_code = VerifyKernelData(kernel_sign_key, config_ptr, kernel_ptr,
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kernel_len,
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kernel_sign_algorithm))) {
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RSAPublicKeyFree(kernel_sign_key);
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return error_code; /* AKA jump to recovery. */
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}
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RSAPublicKeyFree(kernel_sign_key);
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return 0; /* Success! */
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}
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int VerifyKernelImage(const RSAPublicKey* firmware_key,
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const KernelImage* image,
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@@ -617,7 +412,7 @@ int VerifyKernelImage(const RSAPublicKey* firmware_key,
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siglen_map[image->firmware_sign_algorithm],
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image->firmware_sign_algorithm,
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header_digest)) {
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fprintf(stderr, "VerifyKernelImage(): Key signature check failed.\n");
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debug("VerifyKernelImage(): Key signature check failed.\n");
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error_code = VERIFY_KERNEL_KEY_SIGNATURE_FAILED;
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goto verify_failure;
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}
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@@ -723,7 +518,7 @@ int AddKernelSignature(KernelImage* image,
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GetKernelConfigLen(),
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kernel_signing_key_file,
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image->kernel_sign_algorithm))) {
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fprintf(stderr, "Could not compute signature on the kernel config.\n");
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debug("Could not compute signature on the kernel config.\n");
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Free(config_blob);
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return 0;
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}
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@@ -745,7 +540,7 @@ int AddKernelSignature(KernelImage* image,
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image->kernel_sign_algorithm))) {
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Free(config_blob);
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Free(kernel_buf);
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fprintf(stderr, "Could not compute signature on the kernel.\n");
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debug("Could not compute signature on the kernel.\n");
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return 0;
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}
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image->kernel_signature = (uint8_t*) Malloc(signature_len);
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@@ -756,146 +551,8 @@ int AddKernelSignature(KernelImage* image,
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return 1;
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}
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uint32_t GetLogicalKernelVersion(uint8_t* kernel_blob) {
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uint8_t* kernel_ptr;
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uint16_t kernel_key_version;
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uint16_t kernel_version;
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uint16_t firmware_sign_algorithm;
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uint16_t kernel_sign_algorithm;
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int kernel_key_signature_len;
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int kernel_sign_key_len;
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kernel_ptr = kernel_blob + (FIELD_LEN(magic) +
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FIELD_LEN(header_version) +
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FIELD_LEN(header_len));
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Memcpy(&firmware_sign_algorithm, kernel_ptr, sizeof(firmware_sign_algorithm));
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kernel_ptr += FIELD_LEN(firmware_sign_algorithm);
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Memcpy(&kernel_sign_algorithm, kernel_ptr, sizeof(kernel_sign_algorithm));
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kernel_ptr += FIELD_LEN(kernel_sign_algorithm);
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Memcpy(&kernel_key_version, kernel_ptr, sizeof(kernel_key_version));
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if (firmware_sign_algorithm >= kNumAlgorithms)
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return 0;
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if (kernel_sign_algorithm >= kNumAlgorithms)
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return 0;
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kernel_key_signature_len = siglen_map[firmware_sign_algorithm];
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kernel_sign_key_len = RSAProcessedKeySize(kernel_sign_algorithm);
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kernel_ptr += (FIELD_LEN(kernel_key_version) +
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kernel_sign_key_len +
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FIELD_LEN(header_checksum) +
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kernel_key_signature_len);
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Memcpy(&kernel_version, kernel_ptr, sizeof(kernel_version));
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return CombineUint16Pair(kernel_key_version, kernel_version);
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}
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void PrintKernelEntry(kernel_entry* entry) {
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fprintf(stderr, "Boot Priority = %d\n", entry->boot_priority);
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fprintf(stderr, "Boot Tries Remaining = %d\n", entry->boot_tries_remaining);
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fprintf(stderr, "Boot Success Flag = %d\n", entry->boot_success_flag);
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}
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int VerifyKernelDriver_f(uint8_t* firmware_key_blob,
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kernel_entry* kernelA,
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kernel_entry* kernelB,
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int dev_mode) {
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int i;
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/* Contains the logical kernel version (32-bit) which is calculated as
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* (kernel_key_version << 16 | kernel_version) where
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* [kernel_key_version], [firmware_version] are both 16-bit.
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*/
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uint32_t kernelA_lversion, kernelB_lversion;
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uint32_t min_lversion; /* Minimum of kernel A and kernel B lversion. */
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uint32_t stored_lversion; /* Stored logical version in the TPM. */
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kernel_entry* try_kernel[2]; /* Kernel in try order. */
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int try_kernel_which[2]; /* Which corresponding kernel in the try order */
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uint32_t try_kernel_lversion[2]; /* Their logical versions. */
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/* [kernel_to_boot] will eventually contain the boot path to follow
|
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* and is returned to the caller. Initially, we set it to recovery. If
|
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* a valid bootable kernel is found, it will be set to that. */
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int kernel_to_boot = BOOT_KERNEL_RECOVERY_CONTINUE;
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/* The TPM must already have be initialized, so no need to call SetupTPM(). */
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|
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/* We get the key versions by reading directly from the image blobs without
|
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* any additional (expensive) sanity checking on the blob since it's faster to
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* outright reject a kernel with an older kernel key version. A malformed
|
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* or corrupted kernel blob will still fail when VerifyKernel() is called
|
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* on it.
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*/
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kernelA_lversion = GetLogicalKernelVersion(kernelA->kernel_blob);
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kernelB_lversion = GetLogicalKernelVersion(kernelB->kernel_blob);
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min_lversion = Min(kernelA_lversion, kernelB_lversion);
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stored_lversion = CombineUint16Pair(GetStoredVersion(KERNEL_KEY_VERSION),
|
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GetStoredVersion(KERNEL_VERSION));
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/* TODO(gauravsh): The kernel entries kernelA and kernelB come from the
|
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* partition table - verify its signature/checksum before proceeding
|
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* further. */
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|
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/* The logic for deciding which kernel to boot from is taken from the
|
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* the Chromium OS Drive Map design document.
|
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*
|
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* We went to consider the kernels in their according to their boot
|
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* priority attribute value.
|
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*/
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|
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if (kernelA->boot_priority >= kernelB->boot_priority) {
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try_kernel[0] = kernelA;
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try_kernel_which[0] = BOOT_KERNEL_A_CONTINUE;
|
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try_kernel_lversion[0] = kernelA_lversion;
|
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try_kernel[1] = kernelB;
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try_kernel_which[1] = BOOT_KERNEL_B_CONTINUE;
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try_kernel_lversion[1] = kernelB_lversion;
|
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} else {
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try_kernel[0] = kernelB;
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try_kernel_which[0] = BOOT_KERNEL_B_CONTINUE;
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try_kernel_lversion[0] = kernelB_lversion;
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try_kernel[1] = kernelA;
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try_kernel_which[1] = BOOT_KERNEL_A_CONTINUE;
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try_kernel_lversion[1] = kernelA_lversion;
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}
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/* TODO(gauravsh): Changes to boot_tries_remaining and boot_priority
|
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* below should be propagated to partition table. This will be added
|
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* once the firmware parition table parsing code is in. */
|
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for (i = 0; i < 2; i++) {
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if ((try_kernel[i]->boot_success_flag ||
|
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try_kernel[i]->boot_tries_remaining) &&
|
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(VERIFY_KERNEL_SUCCESS == VerifyKernel(firmware_key_blob,
|
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try_kernel[i]->kernel_blob,
|
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dev_mode))) {
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if (try_kernel[i]->boot_tries_remaining > 0)
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try_kernel[i]->boot_tries_remaining--;
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if (stored_lversion > try_kernel_lversion[i])
|
||||
continue; /* Rollback: I am afraid I can't let you do that Dave. */
|
||||
if (i == 0 && (stored_lversion < try_kernel_lversion[1])) {
|
||||
/* The higher priority kernel is valid and bootable, See if we
|
||||
* need to update the stored version for rollback prevention. */
|
||||
if (VERIFY_KERNEL_SUCCESS == VerifyKernel(firmware_key_blob,
|
||||
try_kernel[1]->kernel_blob,
|
||||
dev_mode)) {
|
||||
WriteStoredVersion(KERNEL_KEY_VERSION,
|
||||
(uint16_t) (min_lversion >> 16));
|
||||
WriteStoredVersion(KERNEL_VERSION,
|
||||
(uint16_t) (min_lversion & 0xFFFF));
|
||||
stored_lversion = min_lversion; /* Update stored version as it's
|
||||
* used later. */
|
||||
}
|
||||
}
|
||||
kernel_to_boot = try_kernel_which[i];
|
||||
break; /* We found a valid kernel. */
|
||||
}
|
||||
try_kernel[i]->boot_priority = 0;
|
||||
} /* for loop. */
|
||||
|
||||
/* Lock Kernel TPM rollback indices from further writes.
|
||||
* TODO(gauravsh): Figure out if these can be combined into one
|
||||
* 32-bit location since we seem to always use them together. This can help
|
||||
* us minimize the number of NVRAM writes/locks (which are limited over flash
|
||||
* memory lifetimes.
|
||||
*/
|
||||
LockStoredVersion(KERNEL_KEY_VERSION);
|
||||
LockStoredVersion(KERNEL_VERSION);
|
||||
return kernel_to_boot;
|
||||
debug("Boot Priority = %d\n", entry->boot_priority);
|
||||
debug("Boot Tries Remaining = %d\n", entry->boot_tries_remaining);
|
||||
debug("Boot Success Flag = %d\n", entry->boot_success_flag);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user