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https://github.com/AsahiLinux/u-boot
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0abe3323f5
Just like we exclude data-size, data-position, and data-offset from fit_config_check_sig, we must exclude them while signing as well. While we're at it, use the FIT_DATA_* defines for fit_config_check_sig as welll. Fixes:8edecd3110
("fit: Fix verification of images with external data") Fixes:c522949a29
("rsa: sig: fix config signature check for fit with padding") Signed-off-by: Sean Anderson <sean.anderson@seco.com> Reviewed-by: Simon Glass <sjg@chromium.org>
1348 lines
36 KiB
C
1348 lines
36 KiB
C
// 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, wd@denx.de.
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*/
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#include "mkimage.h"
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#include <bootm.h>
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#include <fdt_region.h>
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#include <image.h>
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#include <version.h>
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#include <openssl/pem.h>
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#include <openssl/evp.h>
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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 supplied 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 processed (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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const 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, const char *algo_name)
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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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uint32_t t = cpu_to_uimage(timestamp);
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ret = fdt_setprop(fit, noffset, FIT_TIMESTAMP_PROP, &t,
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sizeof(uint32_t));
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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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if (algo_name && !ret)
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ret = fdt_setprop_string(fit, noffset, "algo", algo_name);
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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, const char *keyfile, void *fit,
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const char *image_name, int noffset, const char *require_keys,
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const char *engine_id, const char *algo_name)
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{
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const char *node_name;
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const char *padding_name;
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node_name = fit_get_name(fit, noffset, NULL);
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if (!algo_name) {
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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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}
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padding_name = fdt_getprop(fit, noffset, "padding", NULL);
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memset(info, '\0', sizeof(*info));
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info->keydir = keydir;
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info->keyfile = keyfile;
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info->keyname = fdt_getprop(fit, noffset, FIT_KEY_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->padding = image_get_padding_algo(padding_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 supplied 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 (NULL if none)
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* @fit: pointer to the FIT format image header
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* @image_name: name of image being processed (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: keydest node if @keydest is non-NULL, else 0 if none; -ve error code
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* on failure
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*/
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static int fit_image_process_sig(const char *keydir, const char *keyfile,
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void *keydest, 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, const char *algo_name)
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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, keyfile, fit, image_name,
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noffset, require_keys ? "image" : NULL,
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engine_id, algo_name))
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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, algo_name);
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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, FIT_KEY_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 < 0) {
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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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/* Return the node that was written to */
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return ret;
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}
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return 0;
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}
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static int fit_image_read_data(char *filename, unsigned char *data,
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int expected_size)
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{
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struct stat sbuf;
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int fd, ret = -1;
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ssize_t n;
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/* Open file */
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fd = open(filename, O_RDONLY | O_BINARY);
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if (fd < 0) {
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printf("Can't open file %s (err=%d => %s)\n",
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filename, errno, strerror(errno));
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return -1;
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}
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/* Compute file size */
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if (fstat(fd, &sbuf) < 0) {
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printf("Can't fstat file %s (err=%d => %s)\n",
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filename, errno, strerror(errno));
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goto err;
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}
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/* Check file size */
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if (sbuf.st_size != expected_size) {
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printf("File %s don't have the expected size (size=%lld, expected=%d)\n",
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filename, (long long)sbuf.st_size, expected_size);
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goto err;
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}
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/* Read data */
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n = read(fd, data, sbuf.st_size);
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if (n < 0) {
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printf("Can't read file %s (err=%d => %s)\n",
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filename, errno, strerror(errno));
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goto err;
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}
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/* Check that we have read all the file */
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if (n != sbuf.st_size) {
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printf("Can't read all file %s (read %zd bytes, expected %lld)\n",
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filename, n, (long long)sbuf.st_size);
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goto err;
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}
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ret = 0;
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err:
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close(fd);
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return ret;
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}
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static int get_random_data(void *data, int size)
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{
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unsigned char *tmp = data;
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struct timespec date;
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int i, ret;
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if (!tmp) {
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printf("%s: pointer data is NULL\n", __func__);
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ret = -1;
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goto out;
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}
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ret = clock_gettime(CLOCK_MONOTONIC, &date);
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if (ret) {
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printf("%s: clock_gettime has failed (%s)\n", __func__,
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strerror(errno));
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goto out;
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}
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srandom(date.tv_nsec);
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for (i = 0; i < size; i++) {
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*tmp = random() & 0xff;
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tmp++;
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}
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out:
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return ret;
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}
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static int fit_image_setup_cipher(struct image_cipher_info *info,
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const char *keydir, void *fit,
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const char *image_name, int image_noffset,
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int noffset)
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{
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char *algo_name;
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char filename[128];
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int ret = -1;
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if (fit_image_cipher_get_algo(fit, noffset, &algo_name)) {
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printf("Can't get algo name for cipher in image '%s'\n",
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image_name);
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goto out;
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}
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info->keydir = keydir;
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/* Read the key name */
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info->keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
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if (!info->keyname) {
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printf("Can't get key name for cipher in image '%s'\n",
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image_name);
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goto out;
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}
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/*
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* Read the IV name
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*
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* If this property is not provided then mkimage will generate
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* a random IV and store it in the FIT image
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*/
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info->ivname = fdt_getprop(fit, noffset, "iv-name-hint", NULL);
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info->fit = fit;
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info->node_noffset = noffset;
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info->name = algo_name;
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info->cipher = image_get_cipher_algo(algo_name);
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if (!info->cipher) {
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printf("Can't get algo for cipher '%s'\n", image_name);
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goto out;
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}
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/* Read the key in the file */
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snprintf(filename, sizeof(filename), "%s/%s%s",
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info->keydir, info->keyname, ".bin");
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info->key = malloc(info->cipher->key_len);
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if (!info->key) {
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printf("Can't allocate memory for key\n");
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ret = -1;
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goto out;
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}
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ret = fit_image_read_data(filename, (unsigned char *)info->key,
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info->cipher->key_len);
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if (ret < 0)
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goto out;
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info->iv = malloc(info->cipher->iv_len);
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if (!info->iv) {
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printf("Can't allocate memory for iv\n");
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ret = -1;
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goto out;
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}
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|
|
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if (info->ivname) {
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/* Read the IV in the file */
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snprintf(filename, sizeof(filename), "%s/%s%s",
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info->keydir, info->ivname, ".bin");
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ret = fit_image_read_data(filename, (unsigned char *)info->iv,
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info->cipher->iv_len);
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} else {
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/* Generate an ramdom IV */
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ret = get_random_data((void *)info->iv, info->cipher->iv_len);
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}
|
|
|
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out:
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return ret;
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}
|
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|
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int fit_image_write_cipher(void *fit, int image_noffset, int noffset,
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const void *data, size_t size,
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unsigned char *data_ciphered, int data_ciphered_len)
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{
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int ret = -1;
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|
|
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/* Replace data with ciphered data */
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ret = fdt_setprop(fit, image_noffset, FIT_DATA_PROP,
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data_ciphered, data_ciphered_len);
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if (ret == -FDT_ERR_NOSPACE) {
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ret = -ENOSPC;
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goto out;
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|
}
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|
if (ret) {
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printf("Can't replace data with ciphered data (err = %d)\n", ret);
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goto out;
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|
}
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|
|
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/* add non ciphered data size */
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ret = fdt_setprop_u32(fit, image_noffset, "data-size-unciphered", size);
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|
if (ret == -FDT_ERR_NOSPACE) {
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|
ret = -ENOSPC;
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|
goto out;
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|
}
|
|
if (ret) {
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printf("Can't add unciphered data size (err = %d)\n", ret);
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|
goto out;
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|
}
|
|
|
|
out:
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return ret;
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}
|
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|
|
static int
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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)
|
|
{
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|
struct image_cipher_info info;
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unsigned char *data_ciphered = NULL;
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int data_ciphered_len;
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int ret;
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|
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memset(&info, 0, sizeof(info));
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|
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ret = fit_image_setup_cipher(&info, keydir, fit, image_name,
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image_noffset, node_noffset);
|
|
if (ret)
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goto out;
|
|
|
|
ret = info.cipher->encrypt(&info, data, size,
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|
&data_ciphered, &data_ciphered_len);
|
|
if (ret)
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|
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[] = {
|
|
FIT_DATA_PROP,
|
|
FIT_DATA_SIZE_PROP,
|
|
FIT_DATA_POSITION_PROP,
|
|
FIT_DATA_OFFSET_PROP,
|
|
};
|
|
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, ®ion,
|
|
®ion_count, ®ion_prop,
|
|
®ion_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 = -EINVAL;
|
|
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
|