u-boot/tools/mkeficapsule.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2018 Linaro Limited
* Author: AKASHI Takahiro
*/
#include <getopt.h>
#include <pe.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <uuid/uuid.h>
#include <linux/kconfig.h>
#include <gnutls/gnutls.h>
#include <gnutls/pkcs7.h>
#include <gnutls/abstract.h>
#include "eficapsule.h"
static const char *tool_name = "mkeficapsule";
efi_guid_t efi_guid_fm_capsule = EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
static const char *opts_short = "g:i:I:v:p:c:m:dh";
static struct option options[] = {
{"guid", required_argument, NULL, 'g'},
{"index", required_argument, NULL, 'i'},
{"instance", required_argument, NULL, 'I'},
{"private-key", required_argument, NULL, 'p'},
{"certificate", required_argument, NULL, 'c'},
{"monotonic-count", required_argument, NULL, 'm'},
{"dump-sig", no_argument, NULL, 'd'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0},
};
static void print_usage(void)
{
fprintf(stderr, "Usage: %s [options] <image blob> <output file>\n"
"Options:\n"
"\t-g, --guid <guid string> guid for image blob type\n"
"\t-i, --index <index> update image index\n"
"\t-I, --instance <instance> update hardware instance\n"
"\t-p, --private-key <privkey file> private key file\n"
"\t-c, --certificate <cert file> signer's certificate file\n"
"\t-m, --monotonic-count <count> monotonic count\n"
"\t-d, --dump_sig dump signature (*.p7)\n"
"\t-h, --help print a help message\n",
tool_name);
}
/**
* auth_context - authentication context
* @key_file: Path to a private key file
* @cert_file: Path to a certificate file
* @image_data: Pointer to firmware data
* @image_size: Size of firmware data
* @auth: Authentication header
* @sig_data: Signature data
* @sig_size: Size of signature data
*
* Data structure used in create_auth_data(). @key_file through
* @image_size are input parameters. @auth, @sig_data and @sig_size
* are filled in by create_auth_data().
*/
struct auth_context {
char *key_file;
char *cert_file;
uint8_t *image_data;
size_t image_size;
struct efi_firmware_image_authentication auth;
uint8_t *sig_data;
size_t sig_size;
};
static int dump_sig;
/**
* read_bin_file - read a firmware binary file
* @bin: Path to a firmware binary file
* @data: Pointer to pointer of allocated buffer
* @bin_size: Size of allocated buffer
*
* Read out a content of binary, @bin, into @data.
* A caller should free @data.
*
* Return:
* * 0 - on success
* * -1 - on failure
*/
static int read_bin_file(char *bin, uint8_t **data, off_t *bin_size)
{
FILE *g;
struct stat bin_stat;
void *buf;
size_t size;
int ret = 0;
g = fopen(bin, "r");
if (!g) {
fprintf(stderr, "cannot open %s\n", bin);
return -1;
}
if (stat(bin, &bin_stat) < 0) {
fprintf(stderr, "cannot determine the size of %s\n", bin);
ret = -1;
goto err;
}
if (bin_stat.st_size > SIZE_MAX) {
fprintf(stderr, "file size is too large for malloc: %s\n", bin);
ret = -1;
goto err;
}
buf = malloc(bin_stat.st_size);
if (!buf) {
fprintf(stderr, "cannot allocate memory: %zx\n",
(size_t)bin_stat.st_size);
ret = -1;
goto err;
}
size = fread(buf, 1, bin_stat.st_size, g);
if (size < bin_stat.st_size) {
fprintf(stderr, "read failed (%zx)\n", size);
ret = -1;
goto err;
}
*data = buf;
*bin_size = bin_stat.st_size;
err:
fclose(g);
return ret;
}
/**
* write_capsule_file - write a capsule file
* @bin: FILE stream
* @data: Pointer to data
* @bin_size: Size of data
*
* Write out data, @data, with the size @bin_size.
*
* Return:
* * 0 - on success
* * -1 - on failure
*/
static int write_capsule_file(FILE *f, void *data, size_t size, const char *msg)
{
size_t size_written;
size_written = fwrite(data, 1, size, f);
if (size_written < size) {
fprintf(stderr, "%s: write failed (%zx != %zx)\n", msg,
size_written, size);
return -1;
}
return 0;
}
/**
* create_auth_data - compose authentication data in capsule
* @auth_context: Pointer to authentication context
*
* Fill up an authentication header (.auth) and signature data (.sig_data)
* in @auth_context, using library functions from openssl.
* All the parameters in @auth_context must be filled in by a caller.
*
* Return:
* * 0 - on success
* * -1 - on failure
*/
static int create_auth_data(struct auth_context *ctx)
{
gnutls_datum_t cert;
gnutls_datum_t key;
off_t file_size;
gnutls_privkey_t pkey;
gnutls_x509_crt_t x509;
gnutls_pkcs7_t pkcs7;
gnutls_datum_t data;
gnutls_datum_t signature;
int ret;
ret = read_bin_file(ctx->cert_file, &cert.data, &file_size);
if (ret < 0)
return -1;
if (file_size > UINT_MAX)
return -1;
cert.size = file_size;
ret = read_bin_file(ctx->key_file, &key.data, &file_size);
if (ret < 0)
return -1;
if (file_size > UINT_MAX)
return -1;
key.size = file_size;
/*
* For debugging,
* gnutls_global_set_time_function(mytime);
* gnutls_global_set_log_function(tls_log_func);
* gnutls_global_set_log_level(6);
*/
ret = gnutls_privkey_init(&pkey);
if (ret < 0) {
fprintf(stderr, "error in gnutls_privkey_init(): %s\n",
gnutls_strerror(ret));
return -1;
}
ret = gnutls_x509_crt_init(&x509);
if (ret < 0) {
fprintf(stderr, "error in gnutls_x509_crt_init(): %s\n",
gnutls_strerror(ret));
return -1;
}
/* load a private key */
ret = gnutls_privkey_import_x509_raw(pkey, &key, GNUTLS_X509_FMT_PEM,
0, 0);
if (ret < 0) {
fprintf(stderr,
"error in gnutls_privkey_import_x509_raw(): %s\n",
gnutls_strerror(ret));
return -1;
}
/* load x509 certificate */
ret = gnutls_x509_crt_import(x509, &cert, GNUTLS_X509_FMT_PEM);
if (ret < 0) {
fprintf(stderr, "error in gnutls_x509_crt_import(): %s\n",
gnutls_strerror(ret));
return -1;
}
/* generate a PKCS #7 structure */
ret = gnutls_pkcs7_init(&pkcs7);
if (ret < 0) {
fprintf(stderr, "error in gnutls_pkcs7_init(): %s\n",
gnutls_strerror(ret));
return -1;
}
/* sign */
/*
* Data should have
* * firmware image
* * monotonic count
* in this order!
* See EDK2's FmpAuthenticatedHandlerRsa2048Sha256()
*/
data.size = ctx->image_size + sizeof(ctx->auth.monotonic_count);
data.data = malloc(data.size);
if (!data.data) {
fprintf(stderr, "allocating memory (0x%x) failed\n", data.size);
return -1;
}
memcpy(data.data, ctx->image_data, ctx->image_size);
memcpy(data.data + ctx->image_size, &ctx->auth.monotonic_count,
sizeof(ctx->auth.monotonic_count));
ret = gnutls_pkcs7_sign(pkcs7, x509, pkey, &data, NULL, NULL,
GNUTLS_DIG_SHA256,
/* GNUTLS_PKCS7_EMBED_DATA? */
GNUTLS_PKCS7_INCLUDE_CERT |
GNUTLS_PKCS7_INCLUDE_TIME);
if (ret < 0) {
fprintf(stderr, "error in gnutls_pkcs7)sign(): %s\n",
gnutls_strerror(ret));
return -1;
}
/* export */
ret = gnutls_pkcs7_export2(pkcs7, GNUTLS_X509_FMT_DER, &signature);
if (ret < 0) {
fprintf(stderr, "error in gnutls_pkcs7_export2: %s\n",
gnutls_strerror(ret));
return -1;
}
ctx->sig_data = signature.data;
ctx->sig_size = signature.size;
/* fill auth_info */
ctx->auth.auth_info.hdr.dwLength = sizeof(ctx->auth.auth_info)
+ ctx->sig_size;
ctx->auth.auth_info.hdr.wRevision = WIN_CERT_REVISION_2_0;
ctx->auth.auth_info.hdr.wCertificateType = WIN_CERT_TYPE_EFI_GUID;
memcpy(&ctx->auth.auth_info.cert_type, &efi_guid_cert_type_pkcs7,
sizeof(efi_guid_cert_type_pkcs7));
/*
* For better clean-ups,
* gnutls_pkcs7_deinit(pkcs7);
* gnutls_privkey_deinit(pkey);
* gnutls_x509_crt_deinit(x509);
* free(cert.data);
* free(key.data);
* if error
* gnutls_free(signature.data);
*/
return 0;
}
/**
* dump_signature - dump out a signature
* @path: Path to a capsule file
* @signature: Signature data
* @sig_size: Size of signature data
*
* Signature data pointed to by @signature will be saved into
* a file whose file name is @path with ".p7" suffix.
*
* Return:
* * 0 - on success
* * -1 - on failure
*/
static int dump_signature(const char *path, uint8_t *signature, size_t sig_size)
{
char *sig_path;
FILE *f;
size_t size;
int ret = -1;
sig_path = malloc(strlen(path) + 3 + 1);
if (!sig_path)
return ret;
sprintf(sig_path, "%s.p7", path);
f = fopen(sig_path, "w");
if (!f)
goto err;
size = fwrite(signature, 1, sig_size, f);
if (size == sig_size)
ret = 0;
fclose(f);
err:
free(sig_path);
return ret;
}
/**
* free_sig_data - free out signature data
* @ctx: Pointer to authentication context
*
* Free signature data allocated in create_auth_data().
*/
static void free_sig_data(struct auth_context *ctx)
{
if (ctx->sig_size)
gnutls_free(ctx->sig_data);
}
/**
* create_fwbin - create an uefi capsule file
* @path: Path to a created capsule file
* @bin: Path to a firmware binary to encapsulate
* @guid: GUID of related FMP driver
* @index: Index number in capsule
* @instance: Instance number in capsule
* @mcount: Monotonic count in authentication information
* @private_file: Path to a private key file
* @cert_file: Path to a certificate file
*
* This function actually does the job of creating an uefi capsule file.
* All the arguments must be supplied.
* If either @private_file ror @cert_file is NULL, the capsule file
* won't be signed.
*
* Return:
* * 0 - on success
* * -1 - on failure
*/
static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
unsigned long index, unsigned long instance,
uint64_t mcount, char *privkey_file, char *cert_file)
{
struct efi_capsule_header header;
struct efi_firmware_management_capsule_header capsule;
struct efi_firmware_management_capsule_image_header image;
struct auth_context auth_context;
FILE *f;
uint8_t *data;
off_t bin_size;
uint64_t offset;
int ret;
#ifdef DEBUG
fprintf(stderr, "For output: %s\n", path);
fprintf(stderr, "\tbin: %s\n\ttype: %pUl\n", bin, guid);
fprintf(stderr, "\tindex: %lu\n\tinstance: %lu\n", index, instance);
#endif
auth_context.sig_size = 0;
f = NULL;
data = NULL;
ret = -1;
/*
* read a firmware binary
*/
if (read_bin_file(bin, &data, &bin_size))
goto err;
/* first, calculate signature to determine its size */
if (privkey_file && cert_file) {
auth_context.key_file = privkey_file;
auth_context.cert_file = cert_file;
auth_context.auth.monotonic_count = mcount;
auth_context.image_data = data;
auth_context.image_size = bin_size;
if (create_auth_data(&auth_context)) {
fprintf(stderr, "Signing firmware image failed\n");
goto err;
}
if (dump_sig &&
dump_signature(path, auth_context.sig_data,
auth_context.sig_size)) {
fprintf(stderr, "Creating signature file failed\n");
goto err;
}
}
/*
* write a capsule file
*/
f = fopen(path, "w");
if (!f) {
fprintf(stderr, "cannot open %s\n", path);
goto err;
}
/*
* capsule file header
*/
header.capsule_guid = efi_guid_fm_capsule;
header.header_size = sizeof(header);
/* TODO: The current implementation ignores flags */
header.flags = CAPSULE_FLAGS_PERSIST_ACROSS_RESET;
header.capsule_image_size = sizeof(header)
+ sizeof(capsule) + sizeof(uint64_t)
+ sizeof(image)
+ bin_size;
if (auth_context.sig_size)
header.capsule_image_size += sizeof(auth_context.auth)
+ auth_context.sig_size;
if (write_capsule_file(f, &header, sizeof(header),
"Capsule header"))
goto err;
/*
* firmware capsule header
* This capsule has only one firmware capsule image.
*/
capsule.version = 0x00000001;
capsule.embedded_driver_count = 0;
capsule.payload_item_count = 1;
if (write_capsule_file(f, &capsule, sizeof(capsule),
"Firmware capsule header"))
goto err;
offset = sizeof(capsule) + sizeof(uint64_t);
if (write_capsule_file(f, &offset, sizeof(offset),
"Offset to capsule image"))
goto err;
/*
* firmware capsule image header
*/
image.version = 0x00000003;
memcpy(&image.update_image_type_id, guid, sizeof(*guid));
image.update_image_index = index;
image.reserved[0] = 0;
image.reserved[1] = 0;
image.reserved[2] = 0;
image.update_image_size = bin_size;
if (auth_context.sig_size)
image.update_image_size += sizeof(auth_context.auth)
+ auth_context.sig_size;
image.update_vendor_code_size = 0; /* none */
image.update_hardware_instance = instance;
image.image_capsule_support = 0;
if (auth_context.sig_size)
image.image_capsule_support |= CAPSULE_SUPPORT_AUTHENTICATION;
if (write_capsule_file(f, &image, sizeof(image),
"Firmware capsule image header"))
goto err;
/*
* signature
*/
if (auth_context.sig_size) {
if (write_capsule_file(f, &auth_context.auth,
sizeof(auth_context.auth),
"Authentication header"))
goto err;
if (write_capsule_file(f, auth_context.sig_data,
auth_context.sig_size, "Signature"))
goto err;
}
/*
* firmware binary
*/
if (write_capsule_file(f, data, bin_size, "Firmware binary"))
goto err;
ret = 0;
err:
if (f)
fclose(f);
free_sig_data(&auth_context);
free(data);
return ret;
}
/**
* convert_uuid_to_guid() - convert UUID to GUID
* @buf: UUID binary
*
* UUID and GUID have the same data structure, but their binary
* formats are different due to the endianness. See lib/uuid.c.
* Since uuid_parse() can handle only UUID, this function must
* be called to get correct data for GUID when parsing a string.
*
* The correct data will be returned in @buf.
*/
void convert_uuid_to_guid(unsigned char *buf)
{
unsigned char c;
c = buf[0];
buf[0] = buf[3];
buf[3] = c;
c = buf[1];
buf[1] = buf[2];
buf[2] = c;
c = buf[4];
buf[4] = buf[5];
buf[5] = c;
c = buf[6];
buf[6] = buf[7];
buf[7] = c;
}
/**
* main - main entry function of mkeficapsule
* @argc: Number of arguments
* @argv: Array of pointers to arguments
*
* Create an uefi capsule file, optionally signing it.
* Parse all the arguments and pass them on to create_fwbin().
*
* Return:
* * 0 - on success
* * -1 - on failure
*/
int main(int argc, char **argv)
{
efi_guid_t *guid;
unsigned char uuid_buf[16];
unsigned long index, instance;
uint64_t mcount;
char *privkey_file, *cert_file;
int c, idx;
guid = NULL;
index = 0;
instance = 0;
mcount = 0;
privkey_file = NULL;
cert_file = NULL;
dump_sig = 0;
for (;;) {
c = getopt_long(argc, argv, opts_short, options, &idx);
if (c == -1)
break;
switch (c) {
case 'g':
if (guid) {
fprintf(stderr,
"Image type already specified\n");
exit(EXIT_FAILURE);
}
if (uuid_parse(optarg, uuid_buf)) {
fprintf(stderr, "Wrong guid format\n");
exit(EXIT_FAILURE);
}
convert_uuid_to_guid(uuid_buf);
guid = (efi_guid_t *)uuid_buf;
break;
case 'i':
index = strtoul(optarg, NULL, 0);
break;
case 'I':
instance = strtoul(optarg, NULL, 0);
break;
case 'p':
if (privkey_file) {
fprintf(stderr,
"Private Key already specified\n");
exit(EXIT_FAILURE);
}
privkey_file = optarg;
break;
case 'c':
if (cert_file) {
fprintf(stderr,
"Certificate file already specified\n");
exit(EXIT_FAILURE);
}
cert_file = optarg;
break;
case 'm':
mcount = strtoul(optarg, NULL, 0);
break;
case 'd':
dump_sig = 1;
break;
case 'h':
print_usage();
exit(EXIT_SUCCESS);
}
}
/* check necessary parameters */
if ((argc != optind + 2) || !guid ||
((privkey_file && !cert_file) ||
(!privkey_file && cert_file))) {
print_usage();
exit(EXIT_FAILURE);
}
if (create_fwbin(argv[argc - 1], argv[argc - 2], guid, index, instance,
mcount, privkey_file, cert_file) < 0) {
fprintf(stderr, "Creating firmware capsule failed\n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}