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750 lines
20 KiB
750 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (c) 2013, Google Inc. |
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* |
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* (C) Copyright 2008 Semihalf |
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* |
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* (C) Copyright 2000-2006 |
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* Wolfgang Denk, DENX Software Engineering, [email protected]. |
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*/ |
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|
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#include "mkimage.h" |
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#include <bootm.h> |
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#include <image.h> |
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#include <version.h> |
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|
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/** |
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* fit_set_hash_value - set hash value in requested has node |
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* @fit: pointer to the FIT format image header |
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* @noffset: hash node offset |
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* @value: hash value to be set |
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* @value_len: hash value length |
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* |
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* fit_set_hash_value() attempts to set hash value in a node at offset |
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* given and returns operation status to the caller. |
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* |
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* returns |
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* 0, on success |
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* -1, on failure |
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*/ |
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static int fit_set_hash_value(void *fit, int noffset, uint8_t *value, |
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int value_len) |
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{ |
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int ret; |
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ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len); |
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if (ret) { |
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printf("Can't set hash '%s' property for '%s' node(%s)\n", |
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FIT_VALUE_PROP, fit_get_name(fit, noffset, NULL), |
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fdt_strerror(ret)); |
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return ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO; |
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} |
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return 0; |
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} |
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/** |
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* fit_image_process_hash - Process a single subnode of the images/ node |
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* |
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* Check each subnode and process accordingly. For hash nodes we generate |
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* a hash of the supplised data and store it in the node. |
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* |
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* @fit: pointer to the FIT format image header |
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* @image_name: name of image being processes (used to display errors) |
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* @noffset: subnode offset |
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* @data: data to process |
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* @size: size of data in bytes |
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* @return 0 if ok, -1 on error |
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*/ |
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static int fit_image_process_hash(void *fit, const char *image_name, |
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int noffset, const void *data, size_t size) |
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{ |
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uint8_t value[FIT_MAX_HASH_LEN]; |
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const char *node_name; |
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int value_len; |
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char *algo; |
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int ret; |
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node_name = fit_get_name(fit, noffset, NULL); |
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if (fit_image_hash_get_algo(fit, noffset, &algo)) { |
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printf("Can't get hash algo property for '%s' hash node in '%s' image node\n", |
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node_name, image_name); |
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return -ENOENT; |
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} |
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if (calculate_hash(data, size, algo, value, &value_len)) { |
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printf("Unsupported hash algorithm (%s) for '%s' hash node in '%s' image node\n", |
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algo, node_name, image_name); |
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return -EPROTONOSUPPORT; |
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} |
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ret = fit_set_hash_value(fit, noffset, value, value_len); |
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if (ret) { |
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printf("Can't set hash value for '%s' hash node in '%s' image node\n", |
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node_name, image_name); |
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return ret; |
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} |
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return 0; |
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} |
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/** |
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* fit_image_write_sig() - write the signature to a FIT |
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* |
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* This writes the signature and signer data to the FIT. |
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* |
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* @fit: pointer to the FIT format image header |
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* @noffset: hash node offset |
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* @value: signature value to be set |
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* @value_len: signature value length |
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* @comment: Text comment to write (NULL for none) |
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* |
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* returns |
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* 0, on success |
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* -FDT_ERR_..., on failure |
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*/ |
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static int fit_image_write_sig(void *fit, int noffset, uint8_t *value, |
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int value_len, const char *comment, const char *region_prop, |
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int region_proplen, const char *cmdname) |
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{ |
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int string_size; |
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int ret; |
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/* |
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* Get the current string size, before we update the FIT and add |
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* more |
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*/ |
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string_size = fdt_size_dt_strings(fit); |
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ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len); |
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if (!ret) { |
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ret = fdt_setprop_string(fit, noffset, "signer-name", |
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"mkimage"); |
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} |
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if (!ret) { |
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ret = fdt_setprop_string(fit, noffset, "signer-version", |
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PLAIN_VERSION); |
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} |
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if (comment && !ret) |
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ret = fdt_setprop_string(fit, noffset, "comment", comment); |
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if (!ret) { |
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time_t timestamp = imagetool_get_source_date(cmdname, |
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time(NULL)); |
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ret = fit_set_timestamp(fit, noffset, timestamp); |
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} |
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if (region_prop && !ret) { |
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uint32_t strdata[2]; |
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ret = fdt_setprop(fit, noffset, "hashed-nodes", |
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region_prop, region_proplen); |
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/* This is a legacy offset, it is unused, and must remain 0. */ |
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strdata[0] = 0; |
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strdata[1] = cpu_to_fdt32(string_size); |
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if (!ret) { |
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ret = fdt_setprop(fit, noffset, "hashed-strings", |
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strdata, sizeof(strdata)); |
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} |
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} |
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return ret; |
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} |
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static int fit_image_setup_sig(struct image_sign_info *info, |
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const char *keydir, void *fit, const char *image_name, |
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int noffset, const char *require_keys, const char *engine_id) |
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{ |
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const char *node_name; |
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char *algo_name; |
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node_name = fit_get_name(fit, noffset, NULL); |
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if (fit_image_hash_get_algo(fit, noffset, &algo_name)) { |
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printf("Can't get algo property for '%s' signature node in '%s' image node\n", |
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node_name, image_name); |
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return -1; |
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} |
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memset(info, '\0', sizeof(*info)); |
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info->keydir = keydir; |
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info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL); |
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info->fit = fit; |
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info->node_offset = noffset; |
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info->name = strdup(algo_name); |
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info->checksum = image_get_checksum_algo(algo_name); |
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info->crypto = image_get_crypto_algo(algo_name); |
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info->require_keys = require_keys; |
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info->engine_id = engine_id; |
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if (!info->checksum || !info->crypto) { |
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printf("Unsupported signature algorithm (%s) for '%s' signature node in '%s' image node\n", |
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algo_name, node_name, image_name); |
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return -1; |
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} |
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return 0; |
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} |
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/** |
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* fit_image_process_sig- Process a single subnode of the images/ node |
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* |
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* Check each subnode and process accordingly. For signature nodes we |
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* generate a signed hash of the supplised data and store it in the node. |
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* |
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* @keydir: Directory containing keys to use for signing |
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* @keydest: Destination FDT blob to write public keys into |
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* @fit: pointer to the FIT format image header |
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* @image_name: name of image being processes (used to display errors) |
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* @noffset: subnode offset |
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* @data: data to process |
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* @size: size of data in bytes |
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* @comment: Comment to add to signature nodes |
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* @require_keys: Mark all keys as 'required' |
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* @engine_id: Engine to use for signing |
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* @return 0 if ok, -1 on error |
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*/ |
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static int fit_image_process_sig(const char *keydir, void *keydest, |
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void *fit, const char *image_name, |
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int noffset, const void *data, size_t size, |
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const char *comment, int require_keys, const char *engine_id, |
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const char *cmdname) |
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{ |
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struct image_sign_info info; |
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struct image_region region; |
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const char *node_name; |
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uint8_t *value; |
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uint value_len; |
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int ret; |
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if (fit_image_setup_sig(&info, keydir, fit, image_name, noffset, |
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require_keys ? "image" : NULL, engine_id)) |
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return -1; |
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node_name = fit_get_name(fit, noffset, NULL); |
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region.data = data; |
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region.size = size; |
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ret = info.crypto->sign(&info, ®ion, 1, &value, &value_len); |
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if (ret) { |
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printf("Failed to sign '%s' signature node in '%s' image node: %d\n", |
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node_name, image_name, ret); |
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/* We allow keys to be missing */ |
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if (ret == -ENOENT) |
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return 0; |
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return -1; |
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} |
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ret = fit_image_write_sig(fit, noffset, value, value_len, comment, |
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NULL, 0, cmdname); |
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if (ret) { |
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if (ret == -FDT_ERR_NOSPACE) |
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return -ENOSPC; |
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printf("Can't write signature for '%s' signature node in '%s' conf node: %s\n", |
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node_name, image_name, fdt_strerror(ret)); |
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return -1; |
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} |
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free(value); |
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/* Get keyname again, as FDT has changed and invalidated our pointer */ |
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info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL); |
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/* |
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* Write the public key into the supplied FDT file; this might fail |
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* several times, since we try signing with successively increasing |
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* size values |
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*/ |
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if (keydest) { |
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ret = info.crypto->add_verify_data(&info, keydest); |
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if (ret) { |
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printf("Failed to add verification data for '%s' signature node in '%s' image node\n", |
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node_name, image_name); |
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return ret; |
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} |
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} |
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return 0; |
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} |
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/** |
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* fit_image_add_verification_data() - calculate/set verig. data for image node |
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* |
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* This adds hash and signature values for an component image node. |
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* |
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* All existing hash subnodes are checked, if algorithm property is set to |
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* one of the supported hash algorithms, hash value is computed and |
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* corresponding hash node property is set, for example: |
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* |
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* Input component image node structure: |
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* |
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* o image-1 (at image_noffset) |
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* | - data = [binary data] |
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* o hash-1 |
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* |- algo = "sha1" |
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* |
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* Output component image node structure: |
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* |
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* o image-1 (at image_noffset) |
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* | - data = [binary data] |
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* o hash-1 |
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* |- algo = "sha1" |
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* |- value = sha1(data) |
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* |
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* For signature details, please see doc/uImage.FIT/signature.txt |
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* |
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* @keydir Directory containing *.key and *.crt files (or NULL) |
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* @keydest FDT Blob to write public keys into (NULL if none) |
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* @fit: Pointer to the FIT format image header |
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* @image_noffset: Requested component image node |
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* @comment: Comment to add to signature nodes |
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* @require_keys: Mark all keys as 'required' |
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* @engine_id: Engine to use for signing |
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* @return: 0 on success, <0 on failure |
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*/ |
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int fit_image_add_verification_data(const char *keydir, void *keydest, |
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void *fit, int image_noffset, const char *comment, |
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int require_keys, const char *engine_id, const char *cmdname) |
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{ |
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const char *image_name; |
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const void *data; |
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size_t size; |
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int noffset; |
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|
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/* Get image data and data length */ |
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if (fit_image_get_data(fit, image_noffset, &data, &size)) { |
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printf("Can't get image data/size\n"); |
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return -1; |
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} |
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image_name = fit_get_name(fit, image_noffset, NULL); |
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/* Process all hash subnodes of the component image node */ |
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for (noffset = fdt_first_subnode(fit, image_noffset); |
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noffset >= 0; |
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noffset = fdt_next_subnode(fit, noffset)) { |
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const char *node_name; |
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int ret = 0; |
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/* |
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* Check subnode name, must be equal to "hash" or "signature". |
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* Multiple hash nodes require unique unit node |
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* names, e.g. hash-1, hash-2, signature-1, etc. |
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*/ |
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node_name = fit_get_name(fit, noffset, NULL); |
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if (!strncmp(node_name, FIT_HASH_NODENAME, |
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strlen(FIT_HASH_NODENAME))) { |
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ret = fit_image_process_hash(fit, image_name, noffset, |
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data, size); |
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} else if (IMAGE_ENABLE_SIGN && keydir && |
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!strncmp(node_name, FIT_SIG_NODENAME, |
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strlen(FIT_SIG_NODENAME))) { |
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ret = fit_image_process_sig(keydir, keydest, |
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fit, image_name, noffset, data, size, |
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comment, require_keys, engine_id, cmdname); |
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} |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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struct strlist { |
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int count; |
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char **strings; |
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}; |
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static void strlist_init(struct strlist *list) |
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{ |
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memset(list, '\0', sizeof(*list)); |
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} |
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static void strlist_free(struct strlist *list) |
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{ |
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int i; |
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for (i = 0; i < list->count; i++) |
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free(list->strings[i]); |
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free(list->strings); |
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} |
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static int strlist_add(struct strlist *list, const char *str) |
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{ |
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char *dup; |
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dup = strdup(str); |
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list->strings = realloc(list->strings, |
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(list->count + 1) * sizeof(char *)); |
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if (!list || !str) |
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return -1; |
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list->strings[list->count++] = dup; |
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return 0; |
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} |
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static const char *fit_config_get_image_list(void *fit, int noffset, |
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int *lenp, int *allow_missingp) |
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{ |
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static const char default_list[] = FIT_KERNEL_PROP "\0" |
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FIT_FDT_PROP; |
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const char *prop; |
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|
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/* If there is an "image" property, use that */ |
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prop = fdt_getprop(fit, noffset, "sign-images", lenp); |
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if (prop) { |
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*allow_missingp = 0; |
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return *lenp ? prop : NULL; |
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} |
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/* Default image list */ |
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*allow_missingp = 1; |
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*lenp = sizeof(default_list); |
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return default_list; |
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} |
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static int fit_config_get_hash_list(void *fit, int conf_noffset, |
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int sig_offset, struct strlist *node_inc) |
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{ |
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int allow_missing; |
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const char *prop, *iname, *end; |
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const char *conf_name, *sig_name; |
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char name[200], path[200]; |
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int image_count; |
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int ret, len; |
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conf_name = fit_get_name(fit, conf_noffset, NULL); |
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sig_name = fit_get_name(fit, sig_offset, NULL); |
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/* |
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* Build a list of nodes we need to hash. We always need the root |
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* node and the configuration. |
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*/ |
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strlist_init(node_inc); |
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snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, conf_name); |
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if (strlist_add(node_inc, "/") || |
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strlist_add(node_inc, name)) |
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goto err_mem; |
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/* Get a list of images that we intend to sign */ |
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prop = fit_config_get_image_list(fit, sig_offset, &len, |
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&allow_missing); |
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if (!prop) |
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return 0; |
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/* Locate the images */ |
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end = prop + len; |
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image_count = 0; |
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for (iname = prop; iname < end; iname += strlen(iname) + 1) { |
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int noffset; |
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int image_noffset; |
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int hash_count; |
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image_noffset = fit_conf_get_prop_node(fit, conf_noffset, |
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iname); |
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if (image_noffset < 0) { |
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printf("Failed to find image '%s' in configuration '%s/%s'\n", |
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iname, conf_name, sig_name); |
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if (allow_missing) |
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continue; |
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return -ENOENT; |
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} |
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ret = fdt_get_path(fit, image_noffset, path, sizeof(path)); |
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if (ret < 0) |
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goto err_path; |
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if (strlist_add(node_inc, path)) |
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goto err_mem; |
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snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, |
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conf_name); |
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|
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/* Add all this image's hashes */ |
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hash_count = 0; |
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for (noffset = fdt_first_subnode(fit, image_noffset); |
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noffset >= 0; |
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noffset = fdt_next_subnode(fit, noffset)) { |
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const char *name = fit_get_name(fit, noffset, NULL); |
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|
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if (strncmp(name, FIT_HASH_NODENAME, |
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strlen(FIT_HASH_NODENAME))) |
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continue; |
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ret = fdt_get_path(fit, noffset, path, sizeof(path)); |
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if (ret < 0) |
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goto err_path; |
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if (strlist_add(node_inc, path)) |
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goto err_mem; |
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hash_count++; |
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} |
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|
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if (!hash_count) { |
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printf("Failed to find any hash nodes in configuration '%s/%s' image '%s' - without these it is not possible to verify this image\n", |
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conf_name, sig_name, iname); |
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return -ENOMSG; |
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} |
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image_count++; |
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} |
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|
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if (!image_count) { |
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printf("Failed to find any images for configuration '%s/%s'\n", |
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conf_name, sig_name); |
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return -ENOMSG; |
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} |
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return 0; |
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err_mem: |
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printf("Out of memory processing configuration '%s/%s'\n", conf_name, |
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sig_name); |
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return -ENOMEM; |
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err_path: |
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printf("Failed to get path for image '%s' in configuration '%s/%s': %s\n", |
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iname, conf_name, sig_name, fdt_strerror(ret)); |
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return -ENOENT; |
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} |
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|
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static int fit_config_get_data(void *fit, int conf_noffset, int noffset, |
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struct image_region **regionp, int *region_countp, |
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char **region_propp, int *region_proplen) |
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{ |
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char * const exc_prop[] = {"data"}; |
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struct strlist node_inc; |
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struct image_region *region; |
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struct fdt_region fdt_regions[100]; |
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const char *conf_name, *sig_name; |
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char path[200]; |
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int count, i; |
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char *region_prop; |
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int ret, len; |
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|
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conf_name = fit_get_name(fit, conf_noffset, NULL); |
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sig_name = fit_get_name(fit, noffset, NULL); |
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debug("%s: conf='%s', sig='%s'\n", __func__, conf_name, sig_name); |
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|
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/* Get a list of nodes we want to hash */ |
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ret = fit_config_get_hash_list(fit, conf_noffset, noffset, &node_inc); |
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if (ret) |
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return ret; |
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|
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/* Get a list of regions to hash */ |
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count = fdt_find_regions(fit, node_inc.strings, node_inc.count, |
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exc_prop, ARRAY_SIZE(exc_prop), |
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fdt_regions, ARRAY_SIZE(fdt_regions), |
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path, sizeof(path), 1); |
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if (count < 0) { |
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printf("Failed to hash configuration '%s/%s': %s\n", conf_name, |
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sig_name, fdt_strerror(ret)); |
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return -EIO; |
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} |
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if (count == 0) { |
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printf("No data to hash for configuration '%s/%s': %s\n", |
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conf_name, sig_name, fdt_strerror(ret)); |
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return -EINVAL; |
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} |
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|
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/* Build our list of data blocks */ |
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region = fit_region_make_list(fit, fdt_regions, count, NULL); |
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if (!region) { |
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printf("Out of memory hashing configuration '%s/%s'\n", |
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conf_name, sig_name); |
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return -ENOMEM; |
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} |
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|
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/* Create a list of all hashed properties */ |
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debug("Hash nodes:\n"); |
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for (i = len = 0; i < node_inc.count; i++) { |
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debug(" %s\n", node_inc.strings[i]); |
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len += strlen(node_inc.strings[i]) + 1; |
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} |
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region_prop = malloc(len); |
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if (!region_prop) { |
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printf("Out of memory setting up regions for configuration '%s/%s'\n", |
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conf_name, sig_name); |
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return -ENOMEM; |
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} |
|
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; |
|
} |
|
|
|
static int fit_config_process_sig(const char *keydir, 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) |
|
{ |
|
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_data(fit, conf_noffset, noffset, ®ion, |
|
®ion_count, ®ion_prop, ®ion_proplen)) |
|
return -1; |
|
|
|
if (fit_image_setup_sig(&info, keydir, fit, conf_name, noffset, |
|
require_keys ? "conf" : NULL, engine_id)) |
|
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); |
|
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, "key-name-hint", NULL); |
|
|
|
/* Write the public key into the supplied FDT file */ |
|
if (keydest) { |
|
ret = info.crypto->add_verify_data(&info, keydest); |
|
if (ret) { |
|
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, void *keydest, |
|
void *fit, int conf_noffset, const char *comment, |
|
int require_keys, const char *engine_id, const char *cmdname) |
|
{ |
|
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, keydest, |
|
fit, conf_name, conf_noffset, noffset, comment, |
|
require_keys, engine_id, cmdname); |
|
} |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int fit_add_verification_data(const char *keydir, void *keydest, void *fit, |
|
const char *comment, int require_keys, |
|
const char *engine_id, const char *cmdname) |
|
{ |
|
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, keydest, |
|
fit, noffset, comment, require_keys, engine_id, |
|
cmdname); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
/* If there are no keys, we can't sign configurations */ |
|
if (!IMAGE_ENABLE_SIGN || !keydir) |
|
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, keydest, |
|
fit, noffset, comment, |
|
require_keys, |
|
engine_id, cmdname); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_FIT_SIGNATURE |
|
int fit_check_sign(const void *fit, const void *key) |
|
{ |
|
int cfg_noffset; |
|
int ret; |
|
|
|
cfg_noffset = fit_conf_get_node(fit, NULL); |
|
if (!cfg_noffset) |
|
return -1; |
|
|
|
printf("Verifying Hash Integrity ... "); |
|
ret = fit_config_verify(fit, cfg_noffset); |
|
if (ret) |
|
return ret; |
|
ret = bootm_host_load_images(fit, cfg_noffset); |
|
|
|
return ret; |
|
} |
|
#endif
|
|
|