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Vboot Reference: Refactor Code.

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This CL does the following:
1) It adds a SignatureBuf function which uses the OpenSSL library to generate RSA signature. This is more robust than the previous way of invoking the command line "openssl" utility and capturing its output. No more unnecessary temporary files for signature operations.
2) It adds functions that allow direct manipulation of binary verified Firmware and Kernel Image blobs in memory.
3) It changes the structure field members for FirmwareImage to make it consistent with KernelImage. Now it's clearer which key is used when.
4) Minor bug fixes and slightly improved API for dealing verified boot firmware and kernel images.
5) Renames the RSA_verify function to prevent conflicts with OpenSSL since it's linked into the firmware utility binary.

Review URL: http://codereview.chromium.org/661353
This commit is contained in:
Gaurav Shah
2010-03-02 15:40:01 -08:00
parent 444e1e19f2
commit f5564fa98c
21 changed files with 675 additions and 490 deletions
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28
utils/Makefile
View File

@@ -8,26 +8,25 @@ CFLAGS = -Wall -DNDEBUG
INCLUDES ?= -I../include/
TOP ?= ../
LIBS = -lcrypto
LIBS = firmware_image.o kernel_image.o signature_digest.o file_keys.o
FIRMWARELIBS = $(TOP)/crypto/libcrypto.a $(TOP)/common/libcommon.a
all: dumpRSAPublicKey verify_data signature_digest firmware_utility \
file_keys.o firmware_image.o kernel_image.o
all: dumpRSAPublicKey verify_data file_keys.o signature_digest.o firmware_image.o \
kernel_image.o signature_digest.o firmware_utility
dumpRSAPublicKey: dumpRSAPublicKey.c
$(CC) $(CFLAGS) $(LIBS) $< -o $@
$(CC) $(CFLAGS) $< -o $@ -lcrypto
verify_data: verify_data.c file_keys.c
$(CC) $(CFLAGS) $(INCLUDES) $^ -o $@ $(FIRMWARELIBS)
verify_data: verify_data.c $(LIBS) $(FIRMWARELIBS)
$(CC) $(CFLAGS) $(INCLUDES) $< -o $@ $(LIBS) $(FIRMWARELIBS) -lcrypto
signature_digest: signature_digest.c
$(CC) $(CFLAGS) $(INCLUDES) $< -o $@ $(FIRMWARELIBS)
firmware_utility: firmware_utility.cc $(LIBS) $(FIRMWARELIBS)
$(CXX) $(CFLAGS) $(INCLUDES) -ggdb -D__STDC_LIMIT_MACROS $< \
-o $@ $(FIRMWARELIBS) $(LIBS) -lcrypto
firmware_utility: firmware_utility.cc firmware_image.o file_keys.o
$(CXX) $(CFLAGS) $(INCLUDES) -ggdb -D__STDC_LIMIT_MACROS $^ \
-o $@ $(FIRMWARELIBS)
signature_digest.o: signature_digest.c
$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $@
# Used by tests.
file_keys.o: file_keys.c
$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $@
@@ -37,6 +36,5 @@ firmware_image.o: firmware_image.c
kernel_image.o: kernel_image.c
$(CC) $(CFLAGS) -ansi $(INCLUDES) -c $< -o $@
clean:
rm -f dumpRSAPublicKey verify_data signature_digest firmware_image.o \
kernel_image.o file_keys.o firmware_utility
rm -f dumpRSAPublicKey verify_data signature_digest firmware_utility \
$(LIBS)

1
utils/file_keys.c
View File

@@ -17,6 +17,7 @@
#include "padding.h"
#include "rsa_utility.h"
#include "signature_digest.h"
#include "utility.h"
uint8_t* BufferFromFile(const char* input_file, uint32_t* len) {

393
utils/firmware_image.c
View File

@@ -18,6 +18,7 @@
#include "padding.h"
#include "rsa_utility.h"
#include "sha_utility.h"
#include "signature_digest.h"
#include "utility.h"
/* Macro to determine the size of a field structure in the FirmwareImage
@@ -27,7 +28,7 @@
FirmwareImage* FirmwareImageNew(void) {
FirmwareImage* image = (FirmwareImage*) Malloc(sizeof(FirmwareImage));
if (image) {
image->sign_key = NULL;
image->firmware_sign_key = NULL;
image->preamble_signature = NULL;
image->firmware_signature = NULL;
image->firmware_data = NULL;
@@ -37,10 +38,11 @@ FirmwareImage* FirmwareImageNew(void) {
void FirmwareImageFree(FirmwareImage* image) {
if (image) {
Free(image->sign_key);
Free(image->firmware_sign_key);
Free(image->preamble_signature);
Free(image->firmware_signature);
Free(image->firmware_data);
Free(image);
}
}
@@ -48,7 +50,7 @@ FirmwareImage* ReadFirmwareImage(const char* input_file) {
uint32_t file_size;
int image_len = 0; /* Total size of the firmware image. */
int header_len = 0;
int sign_key_len;
int firmware_sign_key_len;
int signature_len;
uint8_t* firmware_buf;
MemcpyState st;
@@ -64,46 +66,49 @@ FirmwareImage* ReadFirmwareImage(const char* input_file) {
st.remaining_buf = firmware_buf;
/* Read and compare magic bytes. */
if (!StatefulMemcpy(&st, &image->magic, FIRMWARE_MAGIC_SIZE))
goto parse_failure;
StatefulMemcpy(&st, &image->magic, FIRMWARE_MAGIC_SIZE);
if (SafeMemcmp(image->magic, FIRMWARE_MAGIC, FIRMWARE_MAGIC_SIZE)) {
fprintf(stderr, "Wrong Firmware Magic.\n");
goto parse_failure;
Free(firmware_buf);
return NULL;
}
StatefulMemcpy(&st, &image->header_len, FIELD_LEN(header_len));
StatefulMemcpy(&st, &image->sign_algorithm, FIELD_LEN(sign_algorithm));
StatefulMemcpy(&st, &image->firmware_sign_algorithm,
FIELD_LEN(firmware_sign_algorithm));
/* Valid Algorithm? */
if (image->sign_algorithm >= kNumAlgorithms)
goto parse_failure;
if (image->firmware_sign_algorithm >= kNumAlgorithms) {
Free(firmware_buf);
return NULL;
}
/* Compute size of pre-processed RSA public key and signature. */
sign_key_len = RSAProcessedKeySize(image->sign_algorithm);
signature_len = siglen_map[image->sign_algorithm];
firmware_sign_key_len = RSAProcessedKeySize(image->firmware_sign_algorithm);
signature_len = siglen_map[image->firmware_sign_algorithm];
/* Check whether the header length is correct. */
header_len = (FIELD_LEN(header_len) +
FIELD_LEN(sign_algorithm) +
sign_key_len +
FIELD_LEN(key_version) +
FIELD_LEN(firmware_sign_algorithm) +
firmware_sign_key_len +
FIELD_LEN(firmware_key_version) +
FIELD_LEN(header_checksum));
if (header_len != image->header_len) {
fprintf(stderr, "Header length mismatch. Got: %d Expected: %d\n",
image->header_len, header_len);
goto parse_failure;
Free(firmware_buf);
return NULL;
}
/* Read pre-processed public half of the sign key. */
image->sign_key = (uint8_t*) Malloc(sign_key_len);
StatefulMemcpy(&st, image->sign_key, sign_key_len);
StatefulMemcpy(&st, &image->key_version, FIELD_LEN(key_version));
image->firmware_sign_key = (uint8_t*) Malloc(firmware_sign_key_len);
StatefulMemcpy(&st, image->firmware_sign_key, firmware_sign_key_len);
StatefulMemcpy(&st, &image->firmware_key_version,
FIELD_LEN(firmware_key_version));
StatefulMemcpy(&st, image->header_checksum, FIELD_LEN(header_checksum));
/* Read key signature. */
StatefulMemcpy(&st, image->key_signature, FIELD_LEN(key_signature));
StatefulMemcpy(&st, image->firmware_key_signature,
FIELD_LEN(firmware_key_signature));
/* Read the firmware preamble. */
StatefulMemcpy(&st,&image->firmware_version, FIELD_LEN(firmware_version));
@@ -120,62 +125,141 @@ FirmwareImage* ReadFirmwareImage(const char* input_file) {
image->firmware_data = (uint8_t*) Malloc(image->firmware_len);
StatefulMemcpy(&st, image->firmware_data, image->firmware_len);
if(st.remaining_len != 0) /* Overrun or underrun. */
goto parse_failure;
Free(firmware_buf);
return image;
parse_failure:
Free(firmware_buf);
return NULL;
}
void WriteFirmwareHeader(int fd, FirmwareImage* image) {
int sign_key_len;
write(fd, &image->header_len, FIELD_LEN(header_len));
write(fd, &image->sign_algorithm, FIELD_LEN(header_len));
sign_key_len = (image->header_len - FIELD_LEN(header_len) -
FIELD_LEN(sign_algorithm) -
FIELD_LEN(key_version) -
FIELD_LEN(header_checksum));
write(fd, image->sign_key, sign_key_len);
write(fd, &image->key_version, FIELD_LEN(key_version));
write(fd, &image->header_checksum, FIELD_LEN(header_checksum));
}
void WriteFirmwarePreamble(int fd, FirmwareImage* image) {
write(fd, &image->firmware_version,
FIELD_LEN(firmware_version));
write(fd, &image->firmware_len, FIELD_LEN(firmware_len));
write(fd, image->preamble, FIELD_LEN(preamble));
}
FirmwareImage* WriteFirmwareImage(const char* input_file,
FirmwareImage* image) {
int fd;
int signature_len;
if (!image)
return NULL;
if (-1 == (fd = creat(input_file, S_IRWXU))) {
fprintf(stderr, "Couldn't open file for writing.\n");
if(st.remaining_len != 0) { /* Overrun or underrun. */
Free(firmware_buf);
return NULL;
}
write(fd, image->magic, FIELD_LEN(magic));
WriteFirmwareHeader(fd, image);
write(fd, image->key_signature, FIELD_LEN(key_signature));
signature_len = siglen_map[image->sign_algorithm];
WriteFirmwarePreamble(fd, image);
write(fd, image->preamble_signature, signature_len);
write(fd, image->firmware_signature, signature_len);
write(fd, image->firmware_data, image->firmware_len);
close(fd);
Free(firmware_buf);
return image;
}
int GetFirmwareHeaderLen(const FirmwareImage* image) {
return (FIELD_LEN(header_len) + FIELD_LEN(header_len) +
RSAProcessedKeySize(image->firmware_sign_algorithm) +
FIELD_LEN(firmware_key_version) + FIELD_LEN(header_checksum));
}
uint8_t* GetFirmwareHeaderBlob(const FirmwareImage* image) {
uint8_t* header_blob = NULL;
MemcpyState st;
header_blob = (uint8_t*) Malloc(GetFirmwareHeaderLen(image));
st.remaining_len = GetFirmwareHeaderLen(image);
st.remaining_buf = header_blob;
StatefulMemcpy_r(&st, &image->header_len, FIELD_LEN(header_len));
StatefulMemcpy_r(&st, &image->firmware_sign_algorithm, FIELD_LEN(header_len));
StatefulMemcpy_r(&st, image->firmware_sign_key,
RSAProcessedKeySize(image->firmware_sign_algorithm));
StatefulMemcpy_r(&st, &image->firmware_key_version,
FIELD_LEN(firmware_key_version));
StatefulMemcpy_r(&st, &image->header_checksum, FIELD_LEN(header_checksum));
if (st.remaining_len != 0) { /* Underrun or Overrun. */
Free(header_blob);
return NULL;
}
return header_blob;
}
int GetFirmwarePreambleLen(const FirmwareImage* image) {
return (FIELD_LEN(firmware_version) + FIELD_LEN(firmware_len) +
FIELD_LEN(preamble));
}
uint8_t* GetFirmwarePreambleBlob(const FirmwareImage* image) {
uint8_t* preamble_blob = NULL;
MemcpyState st;
preamble_blob = (uint8_t*) Malloc(GetFirmwarePreambleLen(image));
st.remaining_len = GetFirmwarePreambleLen(image);
st.remaining_buf = preamble_blob;
StatefulMemcpy_r(&st, &image->firmware_version, FIELD_LEN(firmware_version));
StatefulMemcpy_r(&st, &image->firmware_len, FIELD_LEN(firmware_len));
StatefulMemcpy_r(&st, image->preamble, FIELD_LEN(preamble));
if (st.remaining_len != 0 ) { /* Underrun or Overrun. */
Free(preamble_blob);
return NULL;
}
return preamble_blob;
}
uint8_t* GetFirmwareBlob(const FirmwareImage* image, int* blob_len) {
int firmware_signature_len;
uint8_t* firmware_blob = NULL;
uint8_t* header_blob = NULL;
uint8_t* preamble_blob = NULL;
MemcpyState st;
if (!image)
return NULL;
firmware_signature_len = siglen_map[image->firmware_sign_algorithm];
*blob_len = (FIELD_LEN(magic) +
GetFirmwareHeaderLen(image) +
FIELD_LEN(firmware_key_signature) +
GetFirmwarePreambleLen(image) +
2 * firmware_signature_len +
image->firmware_len);
firmware_blob = (uint8_t*) Malloc(*blob_len);
st.remaining_len = *blob_len;
st.remaining_buf = firmware_blob;
header_blob = GetFirmwareHeaderBlob(image);
preamble_blob = GetFirmwarePreambleBlob(image);
StatefulMemcpy_r(&st, image->magic, FIELD_LEN(magic));
StatefulMemcpy_r(&st, header_blob, GetFirmwareHeaderLen(image));
StatefulMemcpy_r(&st, image->firmware_key_signature,
FIELD_LEN(firmware_key_signature));
StatefulMemcpy_r(&st, preamble_blob, GetFirmwarePreambleLen(image));
StatefulMemcpy_r(&st, image->preamble_signature, firmware_signature_len);
StatefulMemcpy_r(&st, image->firmware_signature, firmware_signature_len);
StatefulMemcpy_r(&st, image->firmware_data, image->firmware_len);
Free(preamble_blob);
Free(header_blob);
if (st.remaining_len != 0) { /* Underrun or Overrun. */
Free(firmware_blob);
return NULL;
}
return firmware_blob;
}
int WriteFirmwareImage(const char* input_file,
const FirmwareImage* image) {
int fd;
uint8_t* firmware_blob;
int blob_len;
if (!image)
return 0;
if (-1 == (fd = creat(input_file, S_IRWXU))) {
fprintf(stderr, "Couldn't open file for writing.\n");
return 0;
}
firmware_blob = GetFirmwareBlob(image, &blob_len);
if (!firmware_blob) {
fprintf(stderr, "Couldn't create firmware blob from FirmwareImage.\n");
return 0;
}
if (blob_len != write(fd, firmware_blob, blob_len)) {
fprintf(stderr, "Couldn't write Firmware Image to file: %s\n", input_file);
Free(firmware_blob);
close(fd);
return 0;
}
Free(firmware_blob);
close(fd);
return 1;
}
void PrintFirmwareImage(const FirmwareImage* image) {
if (!image)
return;
@@ -186,9 +270,9 @@ void PrintFirmwareImage(const FirmwareImage* image) {
"Signature Algorithm = %s\n"
"Key Version = %d\n\n",
image->header_len,
image->sign_algorithm,
algo_strings[image->sign_algorithm],
image->key_version);
image->firmware_sign_algorithm,
algo_strings[image->firmware_sign_algorithm],
image->firmware_key_version);
/* TODO(gauravsh): Output hash and key signature here? */
/* Print preamble. */
printf("Firmware Version = %d\n"
@@ -213,31 +297,31 @@ int VerifyFirmwareHeader(const uint8_t* root_key_blob,
const int dev_mode,
int* algorithm,
int* header_len) {
int sign_key_len;
int firmware_sign_key_len;
int root_key_len;
uint16_t hlen, algo;
uint8_t* header_checksum = NULL;
/* Base Offset for the header_checksum field. Actual offset is
* this + sign_key_len. */
* this + firmware_sign_key_len. */
int base_header_checksum_offset = (FIELD_LEN(header_len) +
FIELD_LEN(sign_algorithm) +
FIELD_LEN(key_version));
FIELD_LEN(firmware_sign_algorithm) +
FIELD_LEN(firmware_key_version));
root_key_len = RSAProcessedKeySize(ROOT_SIGNATURE_ALGORITHM);
Memcpy(&hlen, header_blob, sizeof(hlen));
Memcpy(&algo,
header_blob + FIELD_LEN(sign_algorithm),
header_blob + FIELD_LEN(firmware_sign_algorithm),
sizeof(algo));
if (algo >= kNumAlgorithms)
return VERIFY_FIRMWARE_INVALID_ALGORITHM;
*algorithm = (int) algo;
sign_key_len = RSAProcessedKeySize(*algorithm);
firmware_sign_key_len = RSAProcessedKeySize(*algorithm);
/* Verify if header len is correct? */
if (hlen != (base_header_checksum_offset +
sign_key_len +
firmware_sign_key_len +
FIELD_LEN(header_checksum)))
return VERIFY_FIRMWARE_INVALID_IMAGE;
@@ -248,7 +332,8 @@ int VerifyFirmwareHeader(const uint8_t* root_key_blob,
*header_len - FIELD_LEN(header_checksum),
SHA512_DIGEST_ALGORITHM);
if (SafeMemcmp(header_checksum,
header_blob + (base_header_checksum_offset + sign_key_len),
header_blob + (base_header_checksum_offset +
firmware_sign_key_len),
FIELD_LEN(header_checksum))) {
Free(header_checksum);
return VERIFY_FIRMWARE_INVALID_IMAGE;
@@ -267,7 +352,7 @@ int VerifyFirmwareHeader(const uint8_t* root_key_blob,
return 0;
}
int VerifyFirmwarePreamble(RSAPublicKey* sign_key,
int VerifyFirmwarePreamble(RSAPublicKey* firmware_sign_key,
const uint8_t* preamble_blob,
int algorithm,
int* firmware_len) {
@@ -276,7 +361,7 @@ int VerifyFirmwarePreamble(RSAPublicKey* sign_key,
preamble_len = (FIELD_LEN(firmware_version) +
FIELD_LEN(firmware_len) +
FIELD_LEN(preamble));
if (!RSAVerifyBinary_f(NULL, sign_key, /* Key to use */
if (!RSAVerifyBinary_f(NULL, firmware_sign_key, /* Key to use */
preamble_blob, /* Data to verify */
preamble_len, /* Length of data */
preamble_blob + preamble_len, /* Expected Signature */
@@ -289,12 +374,12 @@ int VerifyFirmwarePreamble(RSAPublicKey* sign_key,
return 0;
}
int VerifyFirmwareData(RSAPublicKey* sign_key,
int VerifyFirmwareData(RSAPublicKey* firmware_sign_key,
const uint8_t* firmware_data_start,
int firmware_len,
int algorithm) {
int signature_len = siglen_map[algorithm];
if (!RSAVerifyBinary_f(NULL, sign_key, /* Key to use. */
if (!RSAVerifyBinary_f(NULL, firmware_sign_key, /* Key to use. */
firmware_data_start + signature_len, /* Data to
* verify */
firmware_len, /* Length of data. */
@@ -309,10 +394,10 @@ int VerifyFirmware(const uint8_t* root_key_blob,
const int dev_mode) {
int error_code;
int algorithm; /* Signing key algorithm. */
RSAPublicKey* sign_key;
int sign_key_len, signature_len, header_len, firmware_len;
RSAPublicKey* firmware_sign_key;
int firmware_sign_key_len, signature_len, header_len, firmware_len;
const uint8_t* header_ptr; /* Pointer to header. */
const uint8_t* sign_key_ptr; /* Pointer to signing key. */
const uint8_t* firmware_sign_key_ptr; /* Pointer to signing key. */
const uint8_t* preamble_ptr; /* Pointer to preamble block. */
const uint8_t* firmware_ptr; /* Pointer to firmware signature/data. */
@@ -331,16 +416,18 @@ int VerifyFirmware(const uint8_t* root_key_blob,
/* Parse signing key into RSAPublicKey structure since it is required multiple
* times. */
sign_key_len = RSAProcessedKeySize(algorithm);
sign_key_ptr = header_ptr + (FIELD_LEN(header_len) +
FIELD_LEN(sign_algorithm));
sign_key = RSAPublicKeyFromBuf(sign_key_ptr, sign_key_len);
firmware_sign_key_len = RSAProcessedKeySize(algorithm);
firmware_sign_key_ptr = header_ptr + (FIELD_LEN(header_len) +
FIELD_LEN(firmware_sign_algorithm));
firmware_sign_key = RSAPublicKeyFromBuf(firmware_sign_key_ptr,
firmware_sign_key_len);
signature_len = siglen_map[algorithm];
/* Only continue if preamble verification succeeds. */
preamble_ptr = (header_ptr + header_len +
FIELD_LEN(key_signature));
if ((error_code = VerifyFirmwarePreamble(sign_key, preamble_ptr, algorithm,
FIELD_LEN(firmware_key_signature));
if ((error_code = VerifyFirmwarePreamble(firmware_sign_key, preamble_ptr,
algorithm,
&firmware_len)))
return error_code; /* AKA jump to recovery. */
@@ -351,7 +438,8 @@ int VerifyFirmware(const uint8_t* root_key_blob,
FIELD_LEN(preamble) +
signature_len);
if ((error_code = VerifyFirmwareData(sign_key, firmware_ptr, firmware_len,
if ((error_code = VerifyFirmwareData(firmware_sign_key, firmware_ptr,
firmware_len,
algorithm)))
return error_code; /* AKA jump to recovery. */
@@ -361,11 +449,11 @@ int VerifyFirmware(const uint8_t* root_key_blob,
int VerifyFirmwareImage(const RSAPublicKey* root_key,
const FirmwareImage* image,
const int dev_mode) {
RSAPublicKey* sign_key;
RSAPublicKey* firmware_sign_key;
uint8_t* header_digest = NULL;
uint8_t* preamble_digest = NULL;
uint8_t* firmware_digest = NULL;
int sign_key_size;
int firmware_sign_key_size;
int signature_size;
int error_code = 0;
DigestContext ctx;
@@ -384,17 +472,17 @@ int VerifyFirmwareImage(const RSAPublicKey* root_key,
DigestInit(&ctx, ROOT_SIGNATURE_ALGORITHM);
DigestUpdate(&ctx, (uint8_t*) &image->header_len,
FIELD_LEN(header_len));
DigestUpdate(&ctx, (uint8_t*) &image->sign_algorithm,
FIELD_LEN(sign_algorithm));
DigestUpdate(&ctx, image->sign_key,
RSAProcessedKeySize(image->sign_algorithm));
DigestUpdate(&ctx, (uint8_t*) &image->key_version,
FIELD_LEN(key_version));
DigestUpdate(&ctx, (uint8_t*) &image->firmware_sign_algorithm,
FIELD_LEN(firmware_sign_algorithm));
DigestUpdate(&ctx, image->firmware_sign_key,
RSAProcessedKeySize(image->firmware_sign_algorithm));
DigestUpdate(&ctx, (uint8_t*) &image->firmware_key_version,
FIELD_LEN(firmware_key_version));
DigestUpdate(&ctx, image->header_checksum,
FIELD_LEN(header_checksum));
header_digest = DigestFinal(&ctx);
if (!RSA_verify(root_key, image->key_signature,
FIELD_LEN(key_signature),
if (!RSAVerify(root_key, image->firmware_key_signature,
FIELD_LEN(firmware_key_signature),
ROOT_SIGNATURE_ALGORITHM,
header_digest)) {
error_code = VERIFY_FIRMWARE_ROOT_SIGNATURE_FAILED;
@@ -403,16 +491,16 @@ int VerifyFirmwareImage(const RSAPublicKey* root_key,
}
/* Get sign key to verify the rest of the firmware. */
sign_key_size = RSAProcessedKeySize(image->sign_algorithm);
sign_key = RSAPublicKeyFromBuf(image->sign_key,
sign_key_size);
signature_size = siglen_map[image->sign_algorithm];
firmware_sign_key_size = RSAProcessedKeySize(image->firmware_sign_algorithm);
firmware_sign_key = RSAPublicKeyFromBuf(image->firmware_sign_key,
firmware_sign_key_size);
signature_size = siglen_map[image->firmware_sign_algorithm];
if (image->sign_algorithm >= kNumAlgorithms)
if (image->firmware_sign_algorithm >= kNumAlgorithms)
return VERIFY_FIRMWARE_INVALID_ALGORITHM;
/* Verify firmware preamble signature. */
DigestInit(&ctx, image->sign_algorithm);
DigestInit(&ctx, image->firmware_sign_algorithm);
DigestUpdate(&ctx, (uint8_t*) &image->firmware_version,
FIELD_LEN(firmware_version));
DigestUpdate(&ctx, (uint8_t*) &image->firmware_len,
@@ -420,8 +508,8 @@ int VerifyFirmwareImage(const RSAPublicKey* root_key,
DigestUpdate(&ctx, (uint8_t*) &image->preamble,
FIELD_LEN(preamble));
preamble_digest = DigestFinal(&ctx);
if (!RSA_verify(sign_key, image->preamble_signature,
signature_size, image->sign_algorithm,
if (!RSAVerify(firmware_sign_key, image->preamble_signature,
signature_size, image->firmware_sign_algorithm,
preamble_digest)) {
error_code = VERIFY_FIRMWARE_PREAMBLE_SIGNATURE_FAILED;
goto verify_failure;
@@ -430,9 +518,9 @@ int VerifyFirmwareImage(const RSAPublicKey* root_key,
/* Verify firmware signature. */
firmware_digest = DigestBuf(image->firmware_data,
image->firmware_len,
image->sign_algorithm);
if(!RSA_verify(sign_key, image->firmware_signature,
signature_size, image->sign_algorithm,
image->firmware_sign_algorithm);
if (!RSAVerify(firmware_sign_key, image->firmware_signature,
signature_size, image->firmware_sign_algorithm,
firmware_digest)) {
error_code = VERIFY_FIRMWARE_SIGNATURE_FAILED;
goto verify_failure;
@@ -450,64 +538,49 @@ const char* VerifyFirmwareErrorString(int error) {
}
int AddFirmwareKeySignature(FirmwareImage* image, const char* root_key_file) {
int tmp_hdr_fd;
char* tmp_hdr_file = ".tmpHdrFile";
uint8_t* header_blob = NULL;
uint8_t* signature;
if(-1 == (tmp_hdr_fd = creat(tmp_hdr_file, S_IRWXU))) {
fprintf(stderr, "Could not open temporary file for writing "
"firmware header.\n");
if (!image || !root_key_file)
return 0;
header_blob = GetFirmwareHeaderBlob(image);
if (!header_blob)
return 0;
if (!(signature = SignatureBuf(header_blob,
GetFirmwareHeaderLen(image),
root_key_file,
ROOT_SIGNATURE_ALGORITHM))) {
Free(header_blob);
return 0;
}
WriteFirmwareHeader(tmp_hdr_fd, image);
close(tmp_hdr_fd);
if (!(signature = SignatureFile(tmp_hdr_file, root_key_file,
ROOT_SIGNATURE_ALGORITHM)))
return 0;
Memcpy(image->key_signature, signature, RSA8192NUMBYTES);
Memcpy(image->firmware_key_signature, signature, RSA8192NUMBYTES);
Free(header_blob);
Free(signature);
return 1;
}
int AddFirmwareSignature(FirmwareImage* image, const char* signing_key_file,
int algorithm) {
int tmp_preamble_fd;
char* tmp_preamble_file = ".tmpPreambleFile";
int tmp_firmware_fd;
char* tmp_firmware_file = ".tmpFirmwareFile";
int AddFirmwareSignature(FirmwareImage* image, const char* signing_key_file) {
uint8_t* preamble_blob;
uint8_t* preamble_signature;
uint8_t* firmware_signature;
int signature_len = siglen_map[algorithm];
int signature_len = siglen_map[image->firmware_sign_algorithm];
/* Write preamble to a file. */
if(-1 == (tmp_preamble_fd = creat(tmp_preamble_file, S_IRWXU))) {
fprintf(stderr, "Could not open temporary file for writing "
"firmware preamble.\n");
preamble_blob = GetFirmwarePreambleBlob(image);
if (!(preamble_signature = SignatureBuf(preamble_blob,
GetFirmwarePreambleLen(image),
signing_key_file,
image->firmware_sign_algorithm))) {
Free(preamble_blob);
return 0;
}
WriteFirmwarePreamble(tmp_preamble_fd, image);
close(tmp_preamble_fd);
if (!(preamble_signature = SignatureFile(tmp_preamble_file, signing_key_file,
algorithm)))
return 0;
image->preamble_signature = (uint8_t*) Malloc(signature_len);
Memcpy(image->preamble_signature, preamble_signature, signature_len);
Free(preamble_signature);
if (-1 == (tmp_firmware_fd = creat(tmp_firmware_file, S_IRWXU))) {
fprintf(stderr, "Could not open temporary file for writing "
"firmware.\n");
if (!(firmware_signature = SignatureBuf(image->firmware_data,
image->firmware_len,
signing_key_file,
image->firmware_sign_algorithm)))
return 0;
}
write(tmp_firmware_fd, image->firmware_data, image->firmware_len);
close(tmp_firmware_fd);
if (!(firmware_signature = SignatureFile(tmp_firmware_file, signing_key_file,
algorithm))) {
fprintf(stderr, "Could not open temporary file for writing "
"firmware.\n");
return 0;
}
image->firmware_signature = (uint8_t*) Malloc(signature_len);
Memcpy(image->firmware_signature, firmware_signature, signature_len);
Free(firmware_signature);

81
utils/firmware_utility.cc
View File

@@ -33,8 +33,8 @@ FirmwareUtility::FirmwareUtility():
image_(NULL),
root_key_pub_(NULL),
firmware_version_(-1),
key_version_(-1),
sign_algorithm_(-1),
firmware_key_version_(-1),
firmware_sign_algorithm_(-1),
is_generate_(false),
is_verify_(false) {
}
@@ -54,11 +54,11 @@ void FirmwareUtility::PrintUsage(void) {
"to use for verification.\n\n"
"For \"--generate\", required OPTIONS are:\n"
"--root_key <privkeyfile>\tPrivate root key file\n"
"--sign_key <privkeyfile>\tPrivate signing key file\n"
"--sign_key_pub <pubkeyfile>\tPre-processed public signing"
"--firmware_sign_key <privkeyfile>\tPrivate signing key file\n"
"--firmware_sign_key_pub <pubkeyfile>\tPre-processed public signing"
" key\n"
"--sign_algorithm <algoid>\tSigning algorithm to use\n"
"--key_version <version#>\tSigning Key Version#\n"
"--firmware_sign_algorithm <algoid>\tSigning algorithm to use\n"
"--firmware_key_version <version#>\tSigning Key Version#\n"
"--firmware_version <version#>\tFirmware Version#\n"
"--in <infile>\t\t\tFirmware Image to sign\n"
"--out <outfile>\t\t\tOutput file for verified boot firmware image\n\n"
@@ -74,10 +74,10 @@ bool FirmwareUtility::ParseCmdLineOptions(int argc, char* argv[]) {
static struct option long_options[] = {
{"root_key", 1, 0, 0},
{"root_key_pub", 1, 0, 0},
{"sign_key", 1, 0, 0},
{"sign_key_pub", 1, 0, 0},
{"sign_algorithm", 1, 0, 0},
{"key_version", 1, 0, 0},
{"firmware_sign_key", 1, 0, 0},
{"firmware_sign_key_pub", 1, 0, 0},
{"firmware_sign_algorithm", 1, 0, 0},
{"firmware_key_version", 1, 0, 0},
{"firmware_version", 1, 0, 0},
{"in", 1, 0, 0},
{"out", 1, 0, 0},
@@ -100,21 +100,21 @@ bool FirmwareUtility::ParseCmdLineOptions(int argc, char* argv[]) {
case 1: // root_key_pub
root_key_pub_file_ = optarg;
break;
case 2: // sign_key
sign_key_file_ = optarg;
case 2: // firmware_sign_key
firmware_sign_key_file_ = optarg;
break;
case 3: // sign_key_pub
sign_key_pub_file_ = optarg;
case 3: // firmware_sign_key_pub
firmware_sign_key_pub_file_ = optarg;
break;
case 4: // sign_algorithm
case 4: // firmware_sign_algorithm
errno = 0; // strtol() returns an error via errno
sign_algorithm_ = strtol(optarg, (char**) NULL, 10);
firmware_sign_algorithm_ = strtol(optarg, (char**) NULL, 10);
if (errno)
return false;
break;
case 5: // key_version
case 5: // firmware_key_version
errno = 0;
key_version_ = strtol(optarg, (char**) NULL, 10);
firmware_key_version_ = strtol(optarg, (char**) NULL, 10);
if (errno)
return false;
break;
@@ -153,7 +153,7 @@ void FirmwareUtility::OutputSignedImage(void) {
}
bool FirmwareUtility::GenerateSignedImage(void) {
uint32_t sign_key_pub_len;
uint32_t firmware_sign_key_pub_len;
uint8_t* header_checksum;
DigestContext ctx;
image_ = FirmwareImageNew();
@@ -161,30 +161,31 @@ bool FirmwareUtility::GenerateSignedImage(void) {
Memcpy(image_->magic, FIRMWARE_MAGIC, FIRMWARE_MAGIC_SIZE);
// Copy pre-processed public signing key.
image_->sign_algorithm = (uint16_t) sign_algorithm_;
image_->sign_key = BufferFromFile(sign_key_pub_file_.c_str(),
&sign_key_pub_len);
if (!image_->sign_key)
image_->firmware_sign_algorithm = (uint16_t) firmware_sign_algorithm_;
image_->firmware_sign_key = BufferFromFile(
firmware_sign_key_pub_file_.c_str(),
&firmware_sign_key_pub_len);
if (!image_->firmware_sign_key)
return false;
image_->key_version = key_version_;
image_->firmware_key_version = firmware_key_version_;
// Update header length.
image_->header_len = (sizeof(image_->header_len) +
sizeof(image_->sign_algorithm) +
sign_key_pub_len +
sizeof(image_->key_version) +
sizeof(image_->firmware_sign_algorithm) +
firmware_sign_key_pub_len +
sizeof(image_->firmware_key_version) +
sizeof(image_->header_checksum));
// Calculate header checksum.
DigestInit(&ctx, SHA512_DIGEST_ALGORITHM);
DigestUpdate(&ctx, (uint8_t*) &image_->header_len,
sizeof(image_->header_len));
DigestUpdate(&ctx, (uint8_t*) &image_->sign_algorithm,
sizeof(image_->sign_algorithm));
DigestUpdate(&ctx, image_->sign_key,
RSAProcessedKeySize(image_->sign_algorithm));
DigestUpdate(&ctx, (uint8_t*) &image_->key_version,
sizeof(image_->key_version));
DigestUpdate(&ctx, (uint8_t*) &image_->firmware_sign_algorithm,
sizeof(image_->firmware_sign_algorithm));
DigestUpdate(&ctx, image_->firmware_sign_key,
RSAProcessedKeySize(image_->firmware_sign_algorithm));
DigestUpdate(&ctx, (uint8_t*) &image_->firmware_key_version,
sizeof(image_->firmware_key_version));
header_checksum = DigestFinal(&ctx);
Memcpy(image_->header_checksum, header_checksum, SHA512_DIGEST_SIZE);
Free(header_checksum);
@@ -199,13 +200,12 @@ bool FirmwareUtility::GenerateSignedImage(void) {
if (!image_)
return false;
// Generate and add the signatures.
if(!AddFirmwareKeySignature(image_, root_key_file_.c_str())) {
if (!AddFirmwareKeySignature(image_, root_key_file_.c_str())) {
cerr << "Couldn't write key signature to verified boot image.\n";
return false;
}
if(!AddFirmwareSignature(image_, sign_key_file_.c_str(),
image_->sign_algorithm)) {
if (!AddFirmwareSignature(image_, firmware_sign_key_file_.c_str())) {
cerr << "Couldn't write firmware signature to verified boot image.\n";
return false;
}
@@ -257,19 +257,20 @@ bool FirmwareUtility::CheckOptions(void) {
cerr << "Invalid or no firmware version specified." << "\n";
return false;
}
if (sign_key_file_.empty()) {
if (firmware_sign_key_file_.empty()) {
cerr << "No signing key file specified." << "\n";
return false;
}
if (sign_key_pub_file_.empty()) {
if (firmware_sign_key_pub_file_.empty()) {
cerr << "No pre-processed public signing key file specified." << "\n";
return false;
}
if (key_version_ <= 0 || key_version_ > UINT16_MAX) {
if (firmware_key_version_ <= 0 || firmware_key_version_ > UINT16_MAX) {
cerr << "Invalid or no key version specified." << "\n";
return false;
}
if (sign_algorithm_ < 0 || sign_algorithm_ >= kNumAlgorithms) {
if (firmware_sign_algorithm_ < 0 ||
firmware_sign_algorithm_ >= kNumAlgorithms) {
cerr << "Invalid or no signing key algorithm specified." << "\n";
return false;
}

295
utils/kernel_image.c
View File

@@ -17,6 +17,7 @@
#include "padding.h"
#include "rsa_utility.h"
#include "sha_utility.h"
#include "signature_digest.h"
#include "utility.h"
/* Macro to determine the size of a field structure in the KernelImage
@@ -68,12 +69,12 @@ KernelImage* ReadKernelImage(const char* input_file) {
st.remaining_buf = kernel_buf;
/* Read and compare magic bytes. */
if (!StatefulMemcpy(&st, &image->magic, KERNEL_MAGIC_SIZE))
goto parse_failure;
StatefulMemcpy(&st, &image->magic, KERNEL_MAGIC_SIZE);
if (SafeMemcmp(image->magic, KERNEL_MAGIC, KERNEL_MAGIC_SIZE)) {
fprintf(stderr, "Wrong Kernel Magic.\n");
goto parse_failure;
Free(kernel_buf);
return NULL;
}
StatefulMemcpy(&st, &image->header_version, FIELD_LEN(header_version));
StatefulMemcpy(&st, &image->header_len, FIELD_LEN(header_len));
@@ -83,12 +84,16 @@ KernelImage* ReadKernelImage(const char* input_file) {
FIELD_LEN(kernel_sign_algorithm));
/* Valid Kernel Key signing algorithm. */
if (image->firmware_sign_algorithm >= kNumAlgorithms)
goto parse_failure;
if (image->firmware_sign_algorithm >= kNumAlgorithms) {
Free(kernel_buf);
return NULL;
}
/* Valid Kernel Signing Algorithm? */
if (image->kernel_sign_algorithm >= kNumAlgorithms)
goto parse_failure;
if (image->kernel_sign_algorithm >= kNumAlgorithms) {
Free(kernel_buf);
return NULL;
}
/* Compute size of pre-processed RSA public keys and signatures. */
firmware_sign_key_len = RSAProcessedKeySize(image->firmware_sign_algorithm);
@@ -108,7 +113,8 @@ KernelImage* ReadKernelImage(const char* input_file) {
if (header_len != image->header_len) {
fprintf(stderr, "Header length mismatch. Got: %d, Expected: %d\n",
image->header_len, header_len);
goto parse_failure;
Free(kernel_buf);
return NULL;
}
/* Read pre-processed public half of the kernel signing key. */
@@ -142,73 +148,150 @@ KernelImage* ReadKernelImage(const char* input_file) {
image->kernel_data = (uint8_t*) Malloc(image->options.kernel_len);
StatefulMemcpy(&st, image->kernel_data, image->options.kernel_len);
if(st.remaining_len != 0) /* Overrun or underrun. */
goto parse_failure;
Free(kernel_buf);
return image;
parse_failure:
Free(kernel_buf);
return NULL;
}
void WriteKernelHeader(int fd, KernelImage* image) {
int kernel_sign_key_len;
write(fd, &image->header_version, FIELD_LEN(header_version));
write(fd, &image->header_len, FIELD_LEN(header_len));
write(fd, &image->firmware_sign_algorithm,
FIELD_LEN(firmware_sign_algorithm));
write(fd, &image->kernel_sign_algorithm,
FIELD_LEN(kernel_sign_algorithm));
write(fd, &image->kernel_key_version, FIELD_LEN(kernel_key_version));
kernel_sign_key_len = (image->header_len -
FIELD_LEN(header_version) -
FIELD_LEN(header_len) -
FIELD_LEN(firmware_sign_algorithm) -
FIELD_LEN(kernel_sign_algorithm) -
FIELD_LEN(kernel_key_version) -
FIELD_LEN(header_checksum));
write(fd, image->kernel_sign_key, kernel_sign_key_len);
write(fd, &image->header_checksum, FIELD_LEN(header_checksum));
}
void WriteKernelConfig(int fd, KernelImage* image) {
write(fd, &image->kernel_version, FIELD_LEN(kernel_version));
write(fd, image->options.version, FIELD_LEN(options.version));
write(fd, &image->options.kernel_len, FIELD_LEN(options.kernel_len));
write(fd, &image->options.kernel_load_addr,
FIELD_LEN(options.kernel_load_addr));
write(fd, &image->options.kernel_entry_addr,
FIELD_LEN(options.kernel_entry_addr));
}
KernelImage* WriteKernelImage(const char* input_file,
KernelImage* image) {
int fd;
int kernel_key_signature_len;
int kernel_signature_len;
if (!image)
return NULL;
if (-1 == (fd = creat(input_file,
S_IRUSR | S_IWUSR))) { /* Owner has R/W permissions. */
fprintf(stderr, "Couldn't open file for writing.\n");
if(st.remaining_len != 0) { /* Overrun or underrun. */
Free(kernel_buf);
return NULL;
}
Free(kernel_buf);
return image;
}
int GetKernelHeaderLen(const KernelImage* image) {
return (FIELD_LEN(header_version) + FIELD_LEN(header_len) +
FIELD_LEN(firmware_sign_algorithm) +
FIELD_LEN(kernel_sign_algorithm) + FIELD_LEN(kernel_key_version) +
RSAProcessedKeySize(image->kernel_sign_algorithm) +
FIELD_LEN(header_checksum));
}
uint8_t* GetKernelHeaderBlob(const KernelImage* image) {
uint8_t* header_blob = NULL;
MemcpyState st;
header_blob = (uint8_t*) Malloc(GetKernelHeaderLen(image));
st.remaining_len = GetKernelHeaderLen(image);
st.remaining_buf = header_blob;
StatefulMemcpy_r(&st, &image->header_version, FIELD_LEN(header_version));
StatefulMemcpy_r(&st, &image->header_len, FIELD_LEN(header_len));
StatefulMemcpy_r(&st, &image->firmware_sign_algorithm,
FIELD_LEN(firmware_sign_algorithm));
StatefulMemcpy_r(&st, &image->kernel_sign_algorithm,
FIELD_LEN(kernel_sign_algorithm));
StatefulMemcpy_r(&st, &image->kernel_key_version,
FIELD_LEN(kernel_key_version));
StatefulMemcpy_r(&st, image->kernel_sign_key,
RSAProcessedKeySize(image->kernel_sign_algorithm));
StatefulMemcpy_r(&st, &image->header_checksum, FIELD_LEN(header_checksum));
if (st.remaining_len != 0) { /* Underrun or Overrun. */
Free(header_blob);
return NULL;
}
return header_blob;
}
int GetKernelConfigLen(const KernelImage* image) {
return (FIELD_LEN(kernel_version) + FIELD_LEN(options.version) +
FIELD_LEN(options.kernel_len) + FIELD_LEN(options.kernel_load_addr) +
FIELD_LEN(options.kernel_entry_addr));
}
uint8_t* GetKernelConfigBlob(const KernelImage* image) {
uint8_t* config_blob = NULL;
MemcpyState st;
config_blob = (uint8_t*) Malloc(GetKernelConfigLen(image));
st.remaining_len = GetKernelConfigLen(image);
st.remaining_buf = config_blob;
StatefulMemcpy_r(&st, &image->kernel_version, FIELD_LEN(kernel_version));
StatefulMemcpy_r(&st, image->options.version, FIELD_LEN(options.version));
StatefulMemcpy_r(&st, &image->options.kernel_len,
FIELD_LEN(options.kernel_len));
StatefulMemcpy_r(&st, &image->options.kernel_load_addr,
FIELD_LEN(options.kernel_load_addr));
StatefulMemcpy_r(&st, &image->options.kernel_entry_addr,
FIELD_LEN(options.kernel_entry_addr));
if (st.remaining_len != 0) { /* Overrun or Underrun. */
Free(config_blob);
return NULL;
}
return config_blob;
}
uint8_t* GetKernelBlob(const KernelImage* image, int* blob_len) {
int kernel_key_signature_len;
int kernel_signature_len;
uint8_t* kernel_blob = NULL;
uint8_t* header_blob = NULL;
uint8_t* config_blob = NULL;
MemcpyState st;
if (!image)
return NULL;
kernel_key_signature_len = siglen_map[image->firmware_sign_algorithm];
kernel_signature_len = siglen_map[image->kernel_sign_algorithm];
*blob_len = (FIELD_LEN(magic) +
GetKernelHeaderLen(image) +
kernel_key_signature_len +
GetKernelConfigLen(image) +
2 * kernel_signature_len +
image->options.kernel_len);
kernel_blob = (uint8_t*) Malloc(*blob_len);
st.remaining_len = *blob_len;
st.remaining_buf = kernel_blob;
write(fd, image->magic, FIELD_LEN(magic));
WriteKernelHeader(fd, image);
write(fd, image->kernel_key_signature, kernel_key_signature_len);
WriteKernelConfig(fd, image);
write(fd, image->config_signature, kernel_signature_len);
write(fd, image->kernel_signature, kernel_signature_len);
write(fd, image->kernel_data, image->options.kernel_len);
header_blob = GetKernelHeaderBlob(image);
config_blob = GetKernelConfigBlob(image);
StatefulMemcpy_r(&st, image->magic, FIELD_LEN(magic));
StatefulMemcpy_r(&st, header_blob, GetKernelHeaderLen(image));
StatefulMemcpy_r(&st, image->kernel_key_signature, kernel_key_signature_len);
StatefulMemcpy_r(&st, config_blob, GetKernelConfigLen(image));
StatefulMemcpy_r(&st, image->config_signature, kernel_signature_len);
StatefulMemcpy_r(&st, image->kernel_signature, kernel_signature_len);
StatefulMemcpy_r(&st, image->kernel_data, image->options.kernel_len);
Free(config_blob);
Free(header_blob);
if (st.remaining_len != 0) { /* Underrun or Overrun. */
Free(kernel_blob);
return NULL;
}
return kernel_blob;
}
int WriteKernelImage(const char* input_file,
const KernelImage* image) {
int fd;
uint8_t* kernel_blob;
int blob_len;
if (!image)
return 0;
if (-1 == (fd = creat(input_file, S_IRWXU))) {
fprintf(stderr, "Couldn't open file for writing kernel image: %s\n",
input_file);
return 0;
}
kernel_blob = GetKernelBlob(image, &blob_len);
if (!kernel_blob) {
fprintf(stderr, "Couldn't create kernel blob from KernelImage.\n");
return 0;
}
if (blob_len != write(fd, kernel_blob, blob_len)) {
fprintf(stderr, "Couldn't write Kernel Image to file: %s\n",
input_file);
Free(kernel_blob);
close(fd);
return 0;
}
Free(kernel_blob);
close(fd);
return image;
return 1;
}
void PrintKernelImage(const KernelImage* image) {
@@ -478,7 +561,7 @@ int VerifyKernelImage(const RSAPublicKey* firmware_key,
DigestUpdate(&ctx, image->header_checksum,
FIELD_LEN(header_checksum));
header_digest = DigestFinal(&ctx);
if (!RSA_verify(firmware_key, image->kernel_key_signature,
if (!RSAVerify(firmware_key, image->kernel_key_signature,
siglen_map[image->firmware_sign_algorithm],
image->firmware_sign_algorithm,
header_digest)) {
@@ -507,9 +590,9 @@ int VerifyKernelImage(const RSAPublicKey* firmware_key,
DigestUpdate(&ctx, (uint8_t*) &image->options.kernel_entry_addr,
FIELD_LEN(options.kernel_entry_addr));
config_digest = DigestFinal(&ctx);
if (!RSA_verify(kernel_sign_key, image->config_signature,
kernel_signature_size, image->kernel_sign_algorithm,
config_digest)) {
if (!RSAVerify(kernel_sign_key, image->config_signature,
kernel_signature_size, image->kernel_sign_algorithm,
config_digest)) {
error_code = VERIFY_KERNEL_CONFIG_SIGNATURE_FAILED;
goto verify_failure;
}
@@ -518,7 +601,7 @@ int VerifyKernelImage(const RSAPublicKey* firmware_key,
kernel_digest = DigestBuf(image->kernel_data,
image->options.kernel_len,
image->kernel_sign_algorithm);
if(!RSA_verify(kernel_sign_key, image->kernel_signature,
if (!RSAVerify(kernel_sign_key, image->kernel_signature,
kernel_signature_size, image->kernel_sign_algorithm,
kernel_digest)) {
error_code = VERIFY_KERNEL_SIGNATURE_FAILED;
@@ -537,63 +620,53 @@ const char* VerifyKernelErrorString(int error) {
}
int AddKernelKeySignature(KernelImage* image, const char* firmware_key_file) {
int tmp_hdr_fd;
char* tmp_hdr_file = ".tmpKernelHdrFile";
uint8_t* header_blob = NULL;
uint8_t* signature;
int signature_len = siglen_map[image->firmware_sign_algorithm];
if(-1 == (tmp_hdr_fd = creat(tmp_hdr_file, S_IRWXU))) {
fprintf(stderr, "Could not open temporary file for writing "
"kernel header.\n");
if (!image || !firmware_key_file)
return 0;
header_blob = GetKernelHeaderBlob(image);
if (!header_blob)
return 0;
if (!(signature = SignatureBuf(header_blob,
GetKernelHeaderLen(image),
firmware_key_file,
image->firmware_sign_algorithm))) {
Free(header_blob);
return 0;
}
WriteKernelHeader(tmp_hdr_fd, image);
close(tmp_hdr_fd);
if (!(signature = SignatureFile(tmp_hdr_file, firmware_key_file,
image->firmware_sign_algorithm)))
return 0;
image->kernel_key_signature = Malloc(signature_len);
Memcpy(image->kernel_key_signature, signature, signature_len);
Free(signature);
Free(header_blob);
return 1;
}
int AddKernelSignature(KernelImage* image, const char* kernel_signing_key_file,
int algorithm) {
int tmp_config_fd;
char* tmp_config_file = ".tmpConfigFile";
int tmp_kernel_fd;
char* tmp_kernel_file = ".tmpKernelFile";
int AddKernelSignature(KernelImage* image,
const char* kernel_signing_key_file) {
uint8_t* config_blob;
uint8_t* config_signature;
uint8_t* kernel_signature;
int signature_len = siglen_map[algorithm];
int signature_len = siglen_map[image->kernel_sign_algorithm];
/* Write config to a file. */
if(-1 == (tmp_config_fd = creat(tmp_config_file, S_IRWXU))) {
fprintf(stderr, "Could not open temporary file for writing "
"kernel config.\n");
config_blob = GetKernelConfigBlob(image);
if (!(config_signature = SignatureBuf(config_blob,
GetKernelConfigLen(image),
kernel_signing_key_file,
image->kernel_sign_algorithm))) {
fprintf(stderr, "Could not compute signature on the kernel config.\n");
Free(config_blob);
return 0;
}
WriteKernelConfig(tmp_config_fd, image);
close(tmp_config_fd);
if (!(config_signature = SignatureFile(tmp_config_file,
kernel_signing_key_file,
algorithm)))
return 0;
image->config_signature = (uint8_t*) Malloc(signature_len);
Memcpy(image->config_signature, config_signature, signature_len);
Free(config_signature);
if (-1 == (tmp_kernel_fd = creat(tmp_kernel_file, S_IRWXU))) {
fprintf(stderr, "Could not open temporary file for writing "
"kernel.\n");
return 0;
}
write(tmp_kernel_fd, image->kernel_data, image->options.kernel_len);
close(tmp_kernel_fd);
if (!(kernel_signature = SignatureFile(tmp_kernel_file,
kernel_signing_key_file,
algorithm))) {
if (!(kernel_signature = SignatureBuf(image->kernel_data,
image->options.kernel_len,
kernel_signing_key_file,
image->kernel_sign_algorithm))) {
fprintf(stderr, "Could not compute signature on the kernel.\n");
return 0;
}

88
utils/signature_digest.c
View File

@@ -1,17 +1,13 @@
/* 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 that outputs the message digest of the contents of a file in a
* format that can be used as input to OpenSSL for an RSA signature.
* Needed until the stable OpenSSL release supports SHA-256/512 digests for
* RSA signatures.
* Outputs DigestInfo || Digest where DigestInfo is the OID depending on the
* choice of the hash algorithm (see padding.c).
*
*/
#include "signature_digest.h"
#define OPENSSL_NO_SHA
#include <openssl/engine.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#include <stdio.h>
#include <stdlib.h>
@@ -20,49 +16,59 @@
#include "padding.h"
#include "sha.h"
#include "sha_utility.h"
#include "utility.h"
uint8_t* PrependDigestInfo(int algorithm, uint8_t* digest) {
const int digest_size = hash_size_map[algorithm];
const int digestinfo_size = digestinfo_size_map[algorithm];
const uint8_t* digestinfo = hash_digestinfo_map[algorithm];
uint8_t* p = malloc(digestinfo_size + digest_size);
memcpy(p, digestinfo, digestinfo_size);
memcpy(p + digestinfo_size, digest, digest_size);
uint8_t* p = Malloc(digestinfo_size + digest_size);
Memcpy(p, digestinfo, digestinfo_size);
Memcpy(p + digestinfo_size, digest, digest_size);
return p;
}
int main(int argc, char* argv[]) {
int i, algorithm;
uint8_t* digest = NULL;
uint8_t* signature = NULL;
uint8_t* SignatureDigest(const uint8_t* buf, int len, int algorithm) {
uint8_t* info_digest = NULL;
uint8_t* digest = NULL;
if (argc != 3) {
fprintf(stderr, "Usage: %s <algorithm> <input file>\n\n",
argv[0]);
fprintf(stderr, "where <algorithm> is the signature algorithm to use:\n");
for(i = 0; i<kNumAlgorithms; i++)
fprintf(stderr, "\t%d for %s\n", i, algo_strings[i]);
return -1;
}
algorithm = atoi(argv[1]);
if (algorithm >= kNumAlgorithms) {
fprintf(stderr, "Invalid Algorithm!\n");
goto failure;
fprintf(stderr, "SignatureDigest() called with invalid algorithm!\n");
} else if ((digest = DigestBuf(buf, len, algorithm))) {
info_digest = PrependDigestInfo(algorithm, digest);
}
if (!(digest = DigestFile(argv[2], algorithm)))
goto failure;
info_digest = PrependDigestInfo(algorithm, digest);
write(1, info_digest, hash_size_map[algorithm] +
digestinfo_size_map[algorithm]);
failure:
free(digest);
free(info_digest);
free(signature);
return 0;
Free(digest);
return info_digest;
}
uint8_t* SignatureBuf(const uint8_t* buf, int len, const char* key_file,
int algorithm) {
FILE* key_fp = NULL;
RSA* key = NULL;
uint8_t* signature = NULL;
uint8_t* signature_digest = SignatureDigest(buf, len, algorithm);
int signature_digest_len = (hash_size_map[algorithm] +
digestinfo_size_map[algorithm]);
key_fp = fopen(key_file, "r");
if (!key_fp) {
fprintf(stderr, "SignatureBuf(): Couldn't open key file: %s\n", key_file);
return NULL;
}
if ((key = PEM_read_RSAPrivateKey(key_fp, NULL, NULL, NULL)))
signature = (uint8_t*) Malloc(siglen_map[algorithm]);
else
fprintf(stderr, "SignatureBuf(): Couldn't read private key from file: %s\n",
key_file);
if (signature) {
if (-1 == RSA_private_encrypt(signature_digest_len, /* Input length. */
signature_digest, /* Input data. */
signature, /* Output signature. */
key, /* Key to use. */
RSA_PKCS1_PADDING)) /* Padding to use. */
fprintf(stderr, "SignatureBuf(): RSA_private_encrypt() failed.\n");
}
if (key)
RSA_free(key);
Free(signature_digest);
return signature;
}

29
utils/verify_data.c
View File

@@ -74,23 +74,22 @@ int main(int argc, char* argv[]) {
return 0;
}
/* Length of the RSA Signature/RSA Key */
sig_len = siglen_map[algorithm];
if (!(key = RSAPublicKeyFromFile(argv[2])))
goto failure;
if (!(signature = read_signature(argv[3], sig_len)))
goto failure;
if (!(digest = DigestFile(argv[4], algorithm)))
goto failure;
if(RSA_verify(key, signature, sig_len, algorithm, digest)) {
return_code = 0;
fprintf(stderr, "Signature Verification "
COL_GREEN "SUCCEEDED" COL_STOP "\n");
} else {
fprintf(stderr, "Signature Verification "
COL_RED "FAILED" COL_STOP "\n");
sig_len = siglen_map[algorithm];
if ((key = RSAPublicKeyFromFile(argv[2])) &&
(signature = read_signature(argv[3], sig_len)) &&
(digest = DigestFile(argv[4], algorithm))) {
if (RSAVerify(key, signature, sig_len, algorithm, digest)) {
return_code = 0;
fprintf(stderr, "Signature Verification "
COL_GREEN "SUCCEEDED" COL_STOP "\n");
} else {
fprintf(stderr, "Signature Verification "
COL_RED "FAILED" COL_STOP "\n");
}
}
else
return_code = -1;
failure:
free(key);
free(signature);
free(digest);