u-boot/tools/image-host.c
Philippe Reynes 6e052d1cba mkimage: add public key for image pre-load stage
This commit enhances mkimage to update the node
/image/pre-load/sig with the public key.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
2022-03-31 14:12:01 -04:00

1345 lines
36 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013, Google Inc.
*
* (C) Copyright 2008 Semihalf
*
* (C) Copyright 2000-2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include "mkimage.h"
#include <bootm.h>
#include <fdt_region.h>
#include <image.h>
#include <version.h>
#include <openssl/pem.h>
#include <openssl/evp.h>
#define IMAGE_PRE_LOAD_PATH "/image/pre-load/sig"
/**
* fit_set_hash_value - set hash value in requested has node
* @fit: pointer to the FIT format image header
* @noffset: hash node offset
* @value: hash value to be set
* @value_len: hash value length
*
* fit_set_hash_value() attempts to set hash value in a node at offset
* given and returns operation status to the caller.
*
* returns
* 0, on success
* -1, on failure
*/
static int fit_set_hash_value(void *fit, int noffset, uint8_t *value,
int value_len)
{
int ret;
ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len);
if (ret) {
printf("Can't set hash '%s' property for '%s' node(%s)\n",
FIT_VALUE_PROP, fit_get_name(fit, noffset, NULL),
fdt_strerror(ret));
return ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
}
return 0;
}
/**
* fit_image_process_hash - Process a single subnode of the images/ node
*
* Check each subnode and process accordingly. For hash nodes we generate
* a hash of the supplied data and store it in the node.
*
* @fit: pointer to the FIT format image header
* @image_name: name of image being processed (used to display errors)
* @noffset: subnode offset
* @data: data to process
* @size: size of data in bytes
* Return: 0 if ok, -1 on error
*/
static int fit_image_process_hash(void *fit, const char *image_name,
int noffset, const void *data, size_t size)
{
uint8_t value[FIT_MAX_HASH_LEN];
const char *node_name;
int value_len;
const char *algo;
int ret;
node_name = fit_get_name(fit, noffset, NULL);
if (fit_image_hash_get_algo(fit, noffset, &algo)) {
printf("Can't get hash algo property for '%s' hash node in '%s' image node\n",
node_name, image_name);
return -ENOENT;
}
if (calculate_hash(data, size, algo, value, &value_len)) {
printf("Unsupported hash algorithm (%s) for '%s' hash node in '%s' image node\n",
algo, node_name, image_name);
return -EPROTONOSUPPORT;
}
ret = fit_set_hash_value(fit, noffset, value, value_len);
if (ret) {
printf("Can't set hash value for '%s' hash node in '%s' image node\n",
node_name, image_name);
return ret;
}
return 0;
}
/**
* fit_image_write_sig() - write the signature to a FIT
*
* This writes the signature and signer data to the FIT.
*
* @fit: pointer to the FIT format image header
* @noffset: hash node offset
* @value: signature value to be set
* @value_len: signature value length
* @comment: Text comment to write (NULL for none)
*
* returns
* 0, on success
* -FDT_ERR_..., on failure
*/
static int fit_image_write_sig(void *fit, int noffset, uint8_t *value,
int value_len, const char *comment, const char *region_prop,
int region_proplen, const char *cmdname, const char *algo_name)
{
int string_size;
int ret;
/*
* Get the current string size, before we update the FIT and add
* more
*/
string_size = fdt_size_dt_strings(fit);
ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len);
if (!ret) {
ret = fdt_setprop_string(fit, noffset, "signer-name",
"mkimage");
}
if (!ret) {
ret = fdt_setprop_string(fit, noffset, "signer-version",
PLAIN_VERSION);
}
if (comment && !ret)
ret = fdt_setprop_string(fit, noffset, "comment", comment);
if (!ret) {
time_t timestamp = imagetool_get_source_date(cmdname,
time(NULL));
uint32_t t = cpu_to_uimage(timestamp);
ret = fdt_setprop(fit, noffset, FIT_TIMESTAMP_PROP, &t,
sizeof(uint32_t));
}
if (region_prop && !ret) {
uint32_t strdata[2];
ret = fdt_setprop(fit, noffset, "hashed-nodes",
region_prop, region_proplen);
/* This is a legacy offset, it is unused, and must remain 0. */
strdata[0] = 0;
strdata[1] = cpu_to_fdt32(string_size);
if (!ret) {
ret = fdt_setprop(fit, noffset, "hashed-strings",
strdata, sizeof(strdata));
}
}
if (algo_name && !ret)
ret = fdt_setprop_string(fit, noffset, "algo", algo_name);
return ret;
}
static int fit_image_setup_sig(struct image_sign_info *info,
const char *keydir, const char *keyfile, void *fit,
const char *image_name, int noffset, const char *require_keys,
const char *engine_id, const char *algo_name)
{
const char *node_name;
const char *padding_name;
node_name = fit_get_name(fit, noffset, NULL);
if (!algo_name) {
if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
printf("Can't get algo property for '%s' signature node in '%s' image node\n",
node_name, image_name);
return -1;
}
}
padding_name = fdt_getprop(fit, noffset, "padding", NULL);
memset(info, '\0', sizeof(*info));
info->keydir = keydir;
info->keyfile = keyfile;
info->keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
info->fit = fit;
info->node_offset = noffset;
info->name = strdup(algo_name);
info->checksum = image_get_checksum_algo(algo_name);
info->crypto = image_get_crypto_algo(algo_name);
info->padding = image_get_padding_algo(padding_name);
info->require_keys = require_keys;
info->engine_id = engine_id;
if (!info->checksum || !info->crypto) {
printf("Unsupported signature algorithm (%s) for '%s' signature node in '%s' image node\n",
algo_name, node_name, image_name);
return -1;
}
return 0;
}
/**
* fit_image_process_sig- Process a single subnode of the images/ node
*
* Check each subnode and process accordingly. For signature nodes we
* generate a signed hash of the supplied data and store it in the node.
*
* @keydir: Directory containing keys to use for signing
* @keydest: Destination FDT blob to write public keys into (NULL if none)
* @fit: pointer to the FIT format image header
* @image_name: name of image being processed (used to display errors)
* @noffset: subnode offset
* @data: data to process
* @size: size of data in bytes
* @comment: Comment to add to signature nodes
* @require_keys: Mark all keys as 'required'
* @engine_id: Engine to use for signing
* Return: keydest node if @keydest is non-NULL, else 0 if none; -ve error code
* on failure
*/
static int fit_image_process_sig(const char *keydir, const char *keyfile,
void *keydest, void *fit, const char *image_name,
int noffset, const void *data, size_t size,
const char *comment, int require_keys, const char *engine_id,
const char *cmdname, const char *algo_name)
{
struct image_sign_info info;
struct image_region region;
const char *node_name;
uint8_t *value;
uint value_len;
int ret;
if (fit_image_setup_sig(&info, keydir, keyfile, fit, image_name,
noffset, require_keys ? "image" : NULL,
engine_id, algo_name))
return -1;
node_name = fit_get_name(fit, noffset, NULL);
region.data = data;
region.size = size;
ret = info.crypto->sign(&info, &region, 1, &value, &value_len);
if (ret) {
printf("Failed to sign '%s' signature node in '%s' image node: %d\n",
node_name, image_name, ret);
/* We allow keys to be missing */
if (ret == -ENOENT)
return 0;
return -1;
}
ret = fit_image_write_sig(fit, noffset, value, value_len, comment,
NULL, 0, cmdname, algo_name);
if (ret) {
if (ret == -FDT_ERR_NOSPACE)
return -ENOSPC;
printf("Can't write signature for '%s' signature node in '%s' conf node: %s\n",
node_name, image_name, fdt_strerror(ret));
return -1;
}
free(value);
/* Get keyname again, as FDT has changed and invalidated our pointer */
info.keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
/*
* Write the public key into the supplied FDT file; this might fail
* several times, since we try signing with successively increasing
* size values
*/
if (keydest) {
ret = info.crypto->add_verify_data(&info, keydest);
if (ret < 0) {
printf("Failed to add verification data for '%s' signature node in '%s' image node\n",
node_name, image_name);
return ret;
}
/* Return the node that was written to */
return ret;
}
return 0;
}
static int fit_image_read_data(char *filename, unsigned char *data,
int expected_size)
{
struct stat sbuf;
int fd, ret = -1;
ssize_t n;
/* Open file */
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0) {
printf("Can't open file %s (err=%d => %s)\n",
filename, errno, strerror(errno));
return -1;
}
/* Compute file size */
if (fstat(fd, &sbuf) < 0) {
printf("Can't fstat file %s (err=%d => %s)\n",
filename, errno, strerror(errno));
goto err;
}
/* Check file size */
if (sbuf.st_size != expected_size) {
printf("File %s don't have the expected size (size=%lld, expected=%d)\n",
filename, (long long)sbuf.st_size, expected_size);
goto err;
}
/* Read data */
n = read(fd, data, sbuf.st_size);
if (n < 0) {
printf("Can't read file %s (err=%d => %s)\n",
filename, errno, strerror(errno));
goto err;
}
/* Check that we have read all the file */
if (n != sbuf.st_size) {
printf("Can't read all file %s (read %zd bytes, expected %lld)\n",
filename, n, (long long)sbuf.st_size);
goto err;
}
ret = 0;
err:
close(fd);
return ret;
}
static int get_random_data(void *data, int size)
{
unsigned char *tmp = data;
struct timespec date;
int i, ret;
if (!tmp) {
printf("%s: pointer data is NULL\n", __func__);
ret = -1;
goto out;
}
ret = clock_gettime(CLOCK_MONOTONIC, &date);
if (ret) {
printf("%s: clock_gettime has failed (%s)\n", __func__,
strerror(errno));
goto out;
}
srandom(date.tv_nsec);
for (i = 0; i < size; i++) {
*tmp = random() & 0xff;
tmp++;
}
out:
return ret;
}
static int fit_image_setup_cipher(struct image_cipher_info *info,
const char *keydir, void *fit,
const char *image_name, int image_noffset,
int noffset)
{
char *algo_name;
char filename[128];
int ret = -1;
if (fit_image_cipher_get_algo(fit, noffset, &algo_name)) {
printf("Can't get algo name for cipher in image '%s'\n",
image_name);
goto out;
}
info->keydir = keydir;
/* Read the key name */
info->keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
if (!info->keyname) {
printf("Can't get key name for cipher in image '%s'\n",
image_name);
goto out;
}
/*
* Read the IV name
*
* If this property is not provided then mkimage will generate
* a random IV and store it in the FIT image
*/
info->ivname = fdt_getprop(fit, noffset, "iv-name-hint", NULL);
info->fit = fit;
info->node_noffset = noffset;
info->name = algo_name;
info->cipher = image_get_cipher_algo(algo_name);
if (!info->cipher) {
printf("Can't get algo for cipher '%s'\n", image_name);
goto out;
}
/* Read the key in the file */
snprintf(filename, sizeof(filename), "%s/%s%s",
info->keydir, info->keyname, ".bin");
info->key = malloc(info->cipher->key_len);
if (!info->key) {
printf("Can't allocate memory for key\n");
ret = -1;
goto out;
}
ret = fit_image_read_data(filename, (unsigned char *)info->key,
info->cipher->key_len);
if (ret < 0)
goto out;
info->iv = malloc(info->cipher->iv_len);
if (!info->iv) {
printf("Can't allocate memory for iv\n");
ret = -1;
goto out;
}
if (info->ivname) {
/* Read the IV in the file */
snprintf(filename, sizeof(filename), "%s/%s%s",
info->keydir, info->ivname, ".bin");
ret = fit_image_read_data(filename, (unsigned char *)info->iv,
info->cipher->iv_len);
} else {
/* Generate an ramdom IV */
ret = get_random_data((void *)info->iv, info->cipher->iv_len);
}
out:
return ret;
}
int fit_image_write_cipher(void *fit, int image_noffset, int noffset,
const void *data, size_t size,
unsigned char *data_ciphered, int data_ciphered_len)
{
int ret = -1;
/* Replace data with ciphered data */
ret = fdt_setprop(fit, image_noffset, FIT_DATA_PROP,
data_ciphered, data_ciphered_len);
if (ret == -FDT_ERR_NOSPACE) {
ret = -ENOSPC;
goto out;
}
if (ret) {
printf("Can't replace data with ciphered data (err = %d)\n", ret);
goto out;
}
/* add non ciphered data size */
ret = fdt_setprop_u32(fit, image_noffset, "data-size-unciphered", size);
if (ret == -FDT_ERR_NOSPACE) {
ret = -ENOSPC;
goto out;
}
if (ret) {
printf("Can't add unciphered data size (err = %d)\n", ret);
goto out;
}
out:
return ret;
}
static int
fit_image_process_cipher(const char *keydir, void *keydest, void *fit,
const char *image_name, int image_noffset,
int node_noffset, const void *data, size_t size,
const char *cmdname)
{
struct image_cipher_info info;
unsigned char *data_ciphered = NULL;
int data_ciphered_len;
int ret;
memset(&info, 0, sizeof(info));
ret = fit_image_setup_cipher(&info, keydir, fit, image_name,
image_noffset, node_noffset);
if (ret)
goto out;
ret = info.cipher->encrypt(&info, data, size,
&data_ciphered, &data_ciphered_len);
if (ret)
goto out;
/*
* Write the public key into the supplied FDT file; this might fail
* several times, since we try signing with successively increasing
* size values
* And, if needed, write the iv in the FIT file
*/
if (keydest) {
ret = info.cipher->add_cipher_data(&info, keydest, fit, node_noffset);
if (ret) {
printf("Failed to add verification data for cipher '%s' in image '%s'\n",
info.keyname, image_name);
goto out;
}
}
ret = fit_image_write_cipher(fit, image_noffset, node_noffset,
data, size,
data_ciphered, data_ciphered_len);
out:
free(data_ciphered);
free((void *)info.key);
free((void *)info.iv);
return ret;
}
int fit_image_cipher_data(const char *keydir, void *keydest,
void *fit, int image_noffset, const char *comment,
int require_keys, const char *engine_id,
const char *cmdname)
{
const char *image_name;
const void *data;
size_t size;
int cipher_node_offset, len;
/* Get image name */
image_name = fit_get_name(fit, image_noffset, NULL);
if (!image_name) {
printf("Can't get image name\n");
return -1;
}
/* Get image data and data length */
if (fit_image_get_data(fit, image_noffset, &data, &size)) {
printf("Can't get image data/size\n");
return -1;
}
/*
* Don't cipher ciphered data.
*
* If the data-size-unciphered property is present the data for this
* image is already encrypted. This is important as 'mkimage -F' can be
* run multiple times on a FIT image.
*/
if (fdt_getprop(fit, image_noffset, "data-size-unciphered", &len))
return 0;
if (len != -FDT_ERR_NOTFOUND) {
printf("Failure testing for data-size-unciphered\n");
return -1;
}
/* Process cipher node if present */
cipher_node_offset = fdt_subnode_offset(fit, image_noffset,
FIT_CIPHER_NODENAME);
if (cipher_node_offset == -FDT_ERR_NOTFOUND)
return 0;
if (cipher_node_offset < 0) {
printf("Failure getting cipher node\n");
return -1;
}
if (!IMAGE_ENABLE_ENCRYPT || !keydir)
return 0;
return fit_image_process_cipher(keydir, keydest, fit, image_name,
image_noffset, cipher_node_offset, data, size, cmdname);
}
/**
* fit_image_add_verification_data() - calculate/set verig. data for image node
*
* This adds hash and signature values for an component image node.
*
* All existing hash subnodes are checked, if algorithm property is set to
* one of the supported hash algorithms, hash value is computed and
* corresponding hash node property is set, for example:
*
* Input component image node structure:
*
* o image-1 (at image_noffset)
* | - data = [binary data]
* o hash-1
* |- algo = "sha1"
*
* Output component image node structure:
*
* o image-1 (at image_noffset)
* | - data = [binary data]
* o hash-1
* |- algo = "sha1"
* |- value = sha1(data)
*
* For signature details, please see doc/uImage.FIT/signature.txt
*
* @keydir Directory containing *.key and *.crt files (or NULL)
* @keydest FDT Blob to write public keys into (NULL if none)
* @fit: Pointer to the FIT format image header
* @image_noffset: Requested component image node
* @comment: Comment to add to signature nodes
* @require_keys: Mark all keys as 'required'
* @engine_id: Engine to use for signing
* @return: 0 on success, <0 on failure
*/
int fit_image_add_verification_data(const char *keydir, const char *keyfile,
void *keydest, void *fit, int image_noffset,
const char *comment, int require_keys, const char *engine_id,
const char *cmdname, const char* algo_name)
{
const char *image_name;
const void *data;
size_t size;
int noffset;
/* Get image data and data length */
if (fit_image_get_data(fit, image_noffset, &data, &size)) {
printf("Can't get image data/size\n");
return -1;
}
image_name = fit_get_name(fit, image_noffset, NULL);
/* Process all hash subnodes of the component image node */
for (noffset = fdt_first_subnode(fit, image_noffset);
noffset >= 0;
noffset = fdt_next_subnode(fit, noffset)) {
const char *node_name;
int ret = 0;
/*
* Check subnode name, must be equal to "hash" or "signature".
* Multiple hash nodes require unique unit node
* names, e.g. hash-1, hash-2, signature-1, etc.
*/
node_name = fit_get_name(fit, noffset, NULL);
if (!strncmp(node_name, FIT_HASH_NODENAME,
strlen(FIT_HASH_NODENAME))) {
ret = fit_image_process_hash(fit, image_name, noffset,
data, size);
} else if (IMAGE_ENABLE_SIGN && (keydir || keyfile) &&
!strncmp(node_name, FIT_SIG_NODENAME,
strlen(FIT_SIG_NODENAME))) {
ret = fit_image_process_sig(keydir, keyfile, keydest,
fit, image_name, noffset, data, size,
comment, require_keys, engine_id, cmdname,
algo_name);
}
if (ret < 0)
return ret;
}
return 0;
}
struct strlist {
int count;
char **strings;
};
static void strlist_init(struct strlist *list)
{
memset(list, '\0', sizeof(*list));
}
static void strlist_free(struct strlist *list)
{
int i;
for (i = 0; i < list->count; i++)
free(list->strings[i]);
free(list->strings);
}
static int strlist_add(struct strlist *list, const char *str)
{
char *dup;
dup = strdup(str);
list->strings = realloc(list->strings,
(list->count + 1) * sizeof(char *));
if (!list || !str)
return -1;
list->strings[list->count++] = dup;
return 0;
}
static const char *fit_config_get_image_list(const void *fit, int noffset,
int *lenp, int *allow_missingp)
{
static const char default_list[] = FIT_KERNEL_PROP "\0"
FIT_FDT_PROP;
const char *prop;
/* If there is an "sign-image" property, use that */
prop = fdt_getprop(fit, noffset, "sign-images", lenp);
if (prop) {
*allow_missingp = 0;
return *lenp ? prop : NULL;
}
/* Default image list */
*allow_missingp = 1;
*lenp = sizeof(default_list);
return default_list;
}
/**
* fit_config_add_hash() - Add a list of nodes to hash for an image
*
* This adds a list of paths to image nodes (as referred to by a particular
* offset) that need to be hashed, to protect a configuration
*
* @fit: Pointer to the FIT format image header
* @image_noffset: Offset of image to process (e.g. /images/kernel-1)
* @node_inc: List of nodes to add to
* @conf_name Configuration-node name, child of /configurations node (only
* used for error messages)
* @sig_name Signature-node name (only used for error messages)
* @iname: Name of image being processed (e.g. "kernel-1" (only used
* for error messages)
*/
static int fit_config_add_hash(const void *fit, int image_noffset,
struct strlist *node_inc, const char *conf_name,
const char *sig_name, const char *iname)
{
char path[200];
int noffset;
int hash_count;
int ret;
ret = fdt_get_path(fit, image_noffset, path, sizeof(path));
if (ret < 0)
goto err_path;
if (strlist_add(node_inc, path))
goto err_mem;
/* Add all this image's hashes */
hash_count = 0;
for (noffset = fdt_first_subnode(fit, image_noffset);
noffset >= 0;
noffset = fdt_next_subnode(fit, noffset)) {
const char *name = fit_get_name(fit, noffset, NULL);
if (strncmp(name, FIT_HASH_NODENAME,
strlen(FIT_HASH_NODENAME)))
continue;
ret = fdt_get_path(fit, noffset, path, sizeof(path));
if (ret < 0)
goto err_path;
if (strlist_add(node_inc, path))
goto err_mem;
hash_count++;
}
if (!hash_count) {
printf("Failed to find any hash nodes in configuration '%s/%s' image '%s' - without these it is not possible to verify this image\n",
conf_name, sig_name, iname);
return -ENOMSG;
}
/* Add this image's cipher node if present */
noffset = fdt_subnode_offset(fit, image_noffset,
FIT_CIPHER_NODENAME);
if (noffset != -FDT_ERR_NOTFOUND) {
if (noffset < 0) {
printf("Failed to get cipher node in configuration '%s/%s' image '%s': %s\n",
conf_name, sig_name, iname,
fdt_strerror(noffset));
return -EIO;
}
ret = fdt_get_path(fit, noffset, path, sizeof(path));
if (ret < 0)
goto err_path;
if (strlist_add(node_inc, path))
goto err_mem;
}
return 0;
err_mem:
printf("Out of memory processing configuration '%s/%s'\n", conf_name,
sig_name);
return -ENOMEM;
err_path:
printf("Failed to get path for image '%s' in configuration '%s/%s': %s\n",
iname, conf_name, sig_name, fdt_strerror(ret));
return -ENOENT;
}
/**
* fit_config_get_hash_list() - Get the regions to sign
*
* This calculates a list of nodes to hash for this particular configuration,
* returning it as a string list (struct strlist, not a devicetree string list)
*
* @fit: Pointer to the FIT format image header
* @conf_noffset: Offset of configuration node to sign (child of
* /configurations node)
* @sig_offset: Offset of signature node containing info about how to sign it
* (child of 'signatures' node)
* @return 0 if OK, -ENOENT if an image referred to by the configuration cannot
* be found, -ENOMSG if ther were no images in the configuration
*/
static int fit_config_get_hash_list(const void *fit, int conf_noffset,
int sig_offset, struct strlist *node_inc)
{
int allow_missing;
const char *prop, *iname, *end;
const char *conf_name, *sig_name;
char name[200];
int image_count;
int ret, len;
conf_name = fit_get_name(fit, conf_noffset, NULL);
sig_name = fit_get_name(fit, sig_offset, NULL);
/*
* Build a list of nodes we need to hash. We always need the root
* node and the configuration.
*/
strlist_init(node_inc);
snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, conf_name);
if (strlist_add(node_inc, "/") ||
strlist_add(node_inc, name))
goto err_mem;
/* Get a list of images that we intend to sign */
prop = fit_config_get_image_list(fit, sig_offset, &len,
&allow_missing);
if (!prop)
return 0;
/* Locate the images */
end = prop + len;
image_count = 0;
for (iname = prop; iname < end; iname += strlen(iname) + 1) {
int image_noffset;
int index, max_index;
max_index = fdt_stringlist_count(fit, conf_noffset, iname);
for (index = 0; index < max_index; index++) {
image_noffset = fit_conf_get_prop_node_index(fit, conf_noffset,
iname, index);
if (image_noffset < 0) {
printf("Failed to find image '%s' in configuration '%s/%s'\n",
iname, conf_name, sig_name);
if (allow_missing)
continue;
return -ENOENT;
}
ret = fit_config_add_hash(fit, image_noffset, node_inc,
conf_name, sig_name, iname);
if (ret < 0)
return ret;
image_count++;
}
}
if (!image_count) {
printf("Failed to find any images for configuration '%s/%s'\n",
conf_name, sig_name);
return -ENOMSG;
}
return 0;
err_mem:
printf("Out of memory processing configuration '%s/%s'\n", conf_name,
sig_name);
return -ENOMEM;
}
/**
* fit_config_get_regions() - Get the regions to sign
*
* This calculates a list of node to hash for this particular configuration,
* then finds which regions of the devicetree they correspond to.
*
* @fit: Pointer to the FIT format image header
* @conf_noffset: Offset of configuration node to sign (child of
* /configurations node)
* @sig_offset: Offset of signature node containing info about how to sign it
* (child of 'signatures' node)
* @regionp: Returns list of regions that need to be hashed (allocated; must be
* freed by the caller)
* @region_count: Returns number of regions
* @region_propp: Returns string-list property containing the list of nodes
* that correspond to the regions. Each entry is a full path to the node.
* This is in devicetree format, i.e. a \0 between each string. This is
* allocated and must be freed by the caller.
* @region_proplen: Returns length of *@@region_propp in bytes
* @return 0 if OK, -ENOMEM if out of memory, -EIO if the regions to hash could
* not be found, -EINVAL if no registers were found to hash
*/
static int fit_config_get_regions(const void *fit, int conf_noffset,
int sig_offset, struct image_region **regionp,
int *region_countp, char **region_propp,
int *region_proplen)
{
char * const exc_prop[] = {"data"};
struct strlist node_inc;
struct image_region *region;
struct fdt_region fdt_regions[100];
const char *conf_name, *sig_name;
char path[200];
int count, i;
char *region_prop;
int ret, len;
conf_name = fit_get_name(fit, conf_noffset, NULL);
sig_name = fit_get_name(fit, sig_offset, NULL);
debug("%s: conf='%s', sig='%s'\n", __func__, conf_name, sig_name);
/* Get a list of nodes we want to hash */
ret = fit_config_get_hash_list(fit, conf_noffset, sig_offset,
&node_inc);
if (ret)
return ret;
/* Get a list of regions to hash */
count = fdt_find_regions(fit, node_inc.strings, node_inc.count,
exc_prop, ARRAY_SIZE(exc_prop),
fdt_regions, ARRAY_SIZE(fdt_regions),
path, sizeof(path), 1);
if (count < 0) {
printf("Failed to hash configuration '%s/%s': %s\n", conf_name,
sig_name, fdt_strerror(ret));
return -EIO;
}
if (count == 0) {
printf("No data to hash for configuration '%s/%s': %s\n",
conf_name, sig_name, fdt_strerror(ret));
return -EINVAL;
}
/* Build our list of data blocks */
region = fit_region_make_list(fit, fdt_regions, count, NULL);
if (!region) {
printf("Out of memory hashing configuration '%s/%s'\n",
conf_name, sig_name);
return -ENOMEM;
}
/* Create a list of all hashed properties */
debug("Hash nodes:\n");
for (i = len = 0; i < node_inc.count; i++) {
debug(" %s\n", node_inc.strings[i]);
len += strlen(node_inc.strings[i]) + 1;
}
region_prop = malloc(len);
if (!region_prop) {
printf("Out of memory setting up regions for configuration '%s/%s'\n",
conf_name, sig_name);
return -ENOMEM;
}
for (i = len = 0; i < node_inc.count;
len += strlen(node_inc.strings[i]) + 1, i++)
strcpy(region_prop + len, node_inc.strings[i]);
strlist_free(&node_inc);
*region_countp = count;
*regionp = region;
*region_propp = region_prop;
*region_proplen = len;
return 0;
}
/**
* fit_config_process_sig - Process a single subnode of the configurations/ node
*
* Generate a signed hash of the supplied data and store it in the node.
*
* @keydir: Directory containing keys to use for signing
* @keydest: Destination FDT blob to write public keys into (NULL if none)
* @fit: pointer to the FIT format image header
* @conf_name name of config being processed (used to display errors)
* @conf_noffset: Offset of configuration node, e.g. '/configurations/conf-1'
* @noffset: subnode offset, e.g. '/configurations/conf-1/sig-1'
* @comment: Comment to add to signature nodes
* @require_keys: Mark all keys as 'required'
* @engine_id: Engine to use for signing
* @cmdname: Command name used when reporting errors
* @return keydest node if @keydest is non-NULL, else 0 if none; -ve error code
* on failure
*/
static int fit_config_process_sig(const char *keydir, const char *keyfile,
void *keydest, void *fit, const char *conf_name,
int conf_noffset, int noffset, const char *comment,
int require_keys, const char *engine_id, const char *cmdname,
const char *algo_name)
{
struct image_sign_info info;
const char *node_name;
struct image_region *region;
char *region_prop;
int region_proplen;
int region_count;
uint8_t *value;
uint value_len;
int ret;
node_name = fit_get_name(fit, noffset, NULL);
if (fit_config_get_regions(fit, conf_noffset, noffset, &region,
&region_count, &region_prop,
&region_proplen))
return -1;
if (fit_image_setup_sig(&info, keydir, keyfile, fit, conf_name, noffset,
require_keys ? "conf" : NULL, engine_id,
algo_name))
return -1;
ret = info.crypto->sign(&info, region, region_count, &value,
&value_len);
free(region);
if (ret) {
printf("Failed to sign '%s' signature node in '%s' conf node\n",
node_name, conf_name);
/* We allow keys to be missing */
if (ret == -ENOENT)
return 0;
return -1;
}
ret = fit_image_write_sig(fit, noffset, value, value_len, comment,
region_prop, region_proplen, cmdname,
algo_name);
if (ret) {
if (ret == -FDT_ERR_NOSPACE)
return -ENOSPC;
printf("Can't write signature for '%s' signature node in '%s' conf node: %s\n",
node_name, conf_name, fdt_strerror(ret));
return -1;
}
free(value);
free(region_prop);
/* Get keyname again, as FDT has changed and invalidated our pointer */
info.keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
/* Write the public key into the supplied FDT file */
if (keydest) {
ret = info.crypto->add_verify_data(&info, keydest);
if (ret < 0) {
printf("Failed to add verification data for '%s' signature node in '%s' configuration node\n",
node_name, conf_name);
}
return ret;
}
return 0;
}
static int fit_config_add_verification_data(const char *keydir,
const char *keyfile, void *keydest, void *fit, int conf_noffset,
const char *comment, int require_keys, const char *engine_id,
const char *cmdname, const char *algo_name,
struct image_summary *summary)
{
const char *conf_name;
int noffset;
conf_name = fit_get_name(fit, conf_noffset, NULL);
/* Process all hash subnodes of the configuration node */
for (noffset = fdt_first_subnode(fit, conf_noffset);
noffset >= 0;
noffset = fdt_next_subnode(fit, noffset)) {
const char *node_name;
int ret = 0;
node_name = fit_get_name(fit, noffset, NULL);
if (!strncmp(node_name, FIT_SIG_NODENAME,
strlen(FIT_SIG_NODENAME))) {
ret = fit_config_process_sig(keydir, keyfile, keydest,
fit, conf_name, conf_noffset, noffset, comment,
require_keys, engine_id, cmdname, algo_name);
if (ret < 0)
return ret;
summary->sig_offset = noffset;
fdt_get_path(fit, noffset, summary->sig_path,
sizeof(summary->sig_path));
if (keydest) {
summary->keydest_offset = ret;
fdt_get_path(keydest, ret,
summary->keydest_path,
sizeof(summary->keydest_path));
}
}
}
return 0;
}
/*
* 0) open file (open)
* 1) read certificate (PEM_read_X509)
* 2) get public key (X509_get_pubkey)
* 3) provide der format (d2i_RSAPublicKey)
*/
static int read_pub_key(const char *keydir, const void *name,
unsigned char **pubkey, int *pubkey_len)
{
char path[1024];
EVP_PKEY *key = NULL;
X509 *cert;
FILE *f;
int ret;
memset(path, 0, 1024);
snprintf(path, sizeof(path), "%s/%s.crt", keydir, (char *)name);
/* Open certificate file */
f = fopen(path, "r");
if (!f) {
fprintf(stderr, "Couldn't open RSA certificate: '%s': %s\n",
path, strerror(errno));
return -EACCES;
}
/* Read the certificate */
cert = NULL;
if (!PEM_read_X509(f, &cert, NULL, NULL)) {
printf("Couldn't read certificate");
ret = -EINVAL;
goto err_cert;
}
/* Get the public key from the certificate. */
key = X509_get_pubkey(cert);
if (!key) {
printf("Couldn't read public key\n");
ret = -EINVAL;
goto err_pubkey;
}
/* Get DER form */
ret = i2d_PublicKey(key, pubkey);
if (ret < 0) {
printf("Couldn't get DER form\n");
ret = -EINVAL;
goto err_pubkey;
}
*pubkey_len = ret;
ret = 0;
err_pubkey:
X509_free(cert);
err_cert:
fclose(f);
return ret;
}
int fit_pre_load_data(const char *keydir, void *keydest, void *fit)
{
int pre_load_noffset;
const void *algo_name;
const void *key_name;
unsigned char *pubkey = NULL;
int ret, pubkey_len;
if (!keydir || !keydest || !fit)
return 0;
/* Search node pre-load sig */
pre_load_noffset = fdt_path_offset(keydest, IMAGE_PRE_LOAD_PATH);
if (pre_load_noffset < 0) {
ret = 0;
goto out;
}
algo_name = fdt_getprop(keydest, pre_load_noffset, "algo-name", NULL);
key_name = fdt_getprop(keydest, pre_load_noffset, "key-name", NULL);
/* Check that all mandatory properties are present */
if (!algo_name || !key_name) {
if (!algo_name)
printf("The property algo-name is missing in the node %s\n",
IMAGE_PRE_LOAD_PATH);
if (!key_name)
printf("The property key-name is missing in the node %s\n",
IMAGE_PRE_LOAD_PATH);
ret = -ENODATA;
goto out;
}
/* Read public key */
ret = read_pub_key(keydir, key_name, &pubkey, &pubkey_len);
if (ret < 0)
goto out;
/* Add the public key to the device tree */
ret = fdt_setprop(keydest, pre_load_noffset, "public-key",
pubkey, pubkey_len);
if (ret)
printf("Can't set public-key in node %s (ret = %d)\n",
IMAGE_PRE_LOAD_PATH, ret);
out:
return ret;
}
int fit_cipher_data(const char *keydir, void *keydest, void *fit,
const char *comment, int require_keys,
const char *engine_id, const char *cmdname)
{
int images_noffset;
int noffset;
int ret;
/* Find images parent node offset */
images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
if (images_noffset < 0) {
printf("Can't find images parent node '%s' (%s)\n",
FIT_IMAGES_PATH, fdt_strerror(images_noffset));
return images_noffset;
}
/* Process its subnodes, print out component images details */
for (noffset = fdt_first_subnode(fit, images_noffset);
noffset >= 0;
noffset = fdt_next_subnode(fit, noffset)) {
/*
* Direct child node of the images parent node,
* i.e. component image node.
*/
ret = fit_image_cipher_data(keydir, keydest,
fit, noffset, comment,
require_keys, engine_id,
cmdname);
if (ret)
return ret;
}
return 0;
}
int fit_add_verification_data(const char *keydir, const char *keyfile,
void *keydest, void *fit, const char *comment,
int require_keys, const char *engine_id,
const char *cmdname, const char *algo_name,
struct image_summary *summary)
{
int images_noffset, confs_noffset;
int noffset;
int ret;
/* Find images parent node offset */
images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
if (images_noffset < 0) {
printf("Can't find images parent node '%s' (%s)\n",
FIT_IMAGES_PATH, fdt_strerror(images_noffset));
return images_noffset;
}
/* Process its subnodes, print out component images details */
for (noffset = fdt_first_subnode(fit, images_noffset);
noffset >= 0;
noffset = fdt_next_subnode(fit, noffset)) {
/*
* Direct child node of the images parent node,
* i.e. component image node.
*/
ret = fit_image_add_verification_data(keydir, keyfile, keydest,
fit, noffset, comment, require_keys, engine_id,
cmdname, algo_name);
if (ret)
return ret;
}
/* If there are no keys, we can't sign configurations */
if (!IMAGE_ENABLE_SIGN || !(keydir || keyfile))
return 0;
/* Find configurations parent node offset */
confs_noffset = fdt_path_offset(fit, FIT_CONFS_PATH);
if (confs_noffset < 0) {
printf("Can't find images parent node '%s' (%s)\n",
FIT_CONFS_PATH, fdt_strerror(confs_noffset));
return -ENOENT;
}
/* Process its subnodes, print out component images details */
for (noffset = fdt_first_subnode(fit, confs_noffset);
noffset >= 0;
noffset = fdt_next_subnode(fit, noffset)) {
ret = fit_config_add_verification_data(keydir, keyfile, keydest,
fit, noffset, comment,
require_keys,
engine_id, cmdname,
algo_name, summary);
if (ret)
return ret;
}
return 0;
}
#ifdef CONFIG_FIT_SIGNATURE
int fit_check_sign(const void *fit, const void *key,
const char *fit_uname_config)
{
int cfg_noffset;
int ret;
cfg_noffset = fit_conf_get_node(fit, fit_uname_config);
if (!cfg_noffset)
return -1;
printf("Verifying Hash Integrity for node '%s'... ",
fdt_get_name(fit, cfg_noffset, NULL));
ret = fit_config_verify(fit, cfg_noffset);
if (ret)
return ret;
printf("Verified OK, loading images\n");
ret = bootm_host_load_images(fit, cfg_noffset);
return ret;
}
#endif