mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 19:10:13 +00:00
1a4af2d950
LibreSSL 3.5.0 and later (also shipped as part of OpenBSD 7.1 and
and later) have an opaque RSA object and do provide the
RSA_get0_* functions that OpenSSL provides.
Fixes: 2ecc354b8e
("tools: mkimage: fix build with LibreSSL")
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Jonathan Gray <jsg@jsg.id.au>
916 lines
26 KiB
C
916 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 Arm Ltd.
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* (C) Copyright 2020-2021 Samuel Holland <samuel@sholland.org>
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*/
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#define OPENSSL_API_COMPAT 0x10101000L
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#include <assert.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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#include <openssl/pem.h>
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#include <openssl/rsa.h>
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#include <image.h>
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#include <sunxi_image.h>
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#include "imagetool.h"
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#include "mkimage.h"
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/*
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* NAND requires 8K padding. For other devices, BROM requires only
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* 512B padding, but let's use the larger padding to cover everything.
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*/
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#define PAD_SIZE 8192
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#define pr_fmt(fmt) "mkimage (TOC0): %s: " fmt
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#define pr_err(fmt, args...) fprintf(stderr, pr_fmt(fmt), "error", ##args)
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#define pr_warn(fmt, args...) fprintf(stderr, pr_fmt(fmt), "warning", ##args)
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#define pr_info(fmt, args...) fprintf(stderr, pr_fmt(fmt), "info", ##args)
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#if defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x3050000fL
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#define RSA_get0_n(key) (key)->n
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#define RSA_get0_e(key) (key)->e
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#define RSA_get0_d(key) (key)->d
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#endif
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struct __packed toc0_key_item {
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__le32 vendor_id;
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__le32 key0_n_len;
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__le32 key0_e_len;
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__le32 key1_n_len;
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__le32 key1_e_len;
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__le32 sig_len;
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uint8_t key0[512];
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uint8_t key1[512];
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uint8_t reserved[32];
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uint8_t sig[256];
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};
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/*
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* This looks somewhat like an X.509 certificate, but it is not valid BER.
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*
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* Some differences:
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* - Some X.509 certificate fields are missing or rearranged.
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* - Some sequences have the wrong tag.
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* - Zero-length sequences are accepted.
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* - Large strings and integers must be an even number of bytes long.
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* - Positive integers are not zero-extended to maintain their sign.
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*
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* See https://linux-sunxi.org/TOC0 for more information.
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*/
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struct __packed toc0_small_tag {
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uint8_t tag;
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uint8_t length;
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};
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typedef struct toc0_small_tag toc0_small_int;
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typedef struct toc0_small_tag toc0_small_oct;
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typedef struct toc0_small_tag toc0_small_seq;
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typedef struct toc0_small_tag toc0_small_exp;
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#define TOC0_SMALL_INT(len) { 0x02, (len) }
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#define TOC0_SMALL_SEQ(len) { 0x30, (len) }
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#define TOC0_SMALL_EXP(tag, len) { 0xa0 | (tag), len }
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struct __packed toc0_large_tag {
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uint8_t tag;
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uint8_t prefix;
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uint8_t length_hi;
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uint8_t length_lo;
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};
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typedef struct toc0_large_tag toc0_large_int;
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typedef struct toc0_large_tag toc0_large_bit;
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typedef struct toc0_large_tag toc0_large_seq;
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#define TOC0_LARGE_INT(len) { 0x02, 0x82, (len) >> 8, (len) & 0xff }
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#define TOC0_LARGE_BIT(len) { 0x03, 0x82, (len) >> 8, (len) & 0xff }
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#define TOC0_LARGE_SEQ(len) { 0x30, 0x82, (len) >> 8, (len) & 0xff }
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struct __packed toc0_cert_item {
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toc0_large_seq tag_totalSequence;
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struct __packed toc0_totalSequence {
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toc0_large_seq tag_mainSequence;
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struct __packed toc0_mainSequence {
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toc0_small_exp tag_explicit0;
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struct __packed toc0_explicit0 {
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toc0_small_int tag_version;
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uint8_t version;
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} explicit0;
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toc0_small_int tag_serialNumber;
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uint8_t serialNumber;
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toc0_small_seq tag_signature;
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toc0_small_seq tag_issuer;
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toc0_small_seq tag_validity;
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toc0_small_seq tag_subject;
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toc0_large_seq tag_subjectPublicKeyInfo;
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struct __packed toc0_subjectPublicKeyInfo {
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toc0_small_seq tag_algorithm;
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toc0_large_seq tag_publicKey;
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struct __packed toc0_publicKey {
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toc0_large_int tag_n;
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uint8_t n[256];
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toc0_small_int tag_e;
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uint8_t e[3];
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} publicKey;
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} subjectPublicKeyInfo;
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toc0_small_exp tag_explicit3;
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struct __packed toc0_explicit3 {
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toc0_small_seq tag_extension;
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struct __packed toc0_extension {
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toc0_small_int tag_digest;
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uint8_t digest[32];
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} extension;
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} explicit3;
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} mainSequence;
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toc0_large_bit tag_sigSequence;
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struct __packed toc0_sigSequence {
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toc0_small_seq tag_algorithm;
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toc0_large_bit tag_signature;
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uint8_t signature[256];
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} sigSequence;
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} totalSequence;
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};
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#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
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static const struct toc0_cert_item cert_item_template = {
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TOC0_LARGE_SEQ(sizeof(struct toc0_totalSequence)),
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{
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TOC0_LARGE_SEQ(sizeof(struct toc0_mainSequence)),
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{
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TOC0_SMALL_EXP(0, sizeof(struct toc0_explicit0)),
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{
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TOC0_SMALL_INT(sizeof_field(struct toc0_explicit0, version)),
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0,
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},
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TOC0_SMALL_INT(sizeof_field(struct toc0_mainSequence, serialNumber)),
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0,
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TOC0_SMALL_SEQ(0),
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TOC0_SMALL_SEQ(0),
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TOC0_SMALL_SEQ(0),
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TOC0_SMALL_SEQ(0),
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TOC0_LARGE_SEQ(sizeof(struct toc0_subjectPublicKeyInfo)),
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{
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TOC0_SMALL_SEQ(0),
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TOC0_LARGE_SEQ(sizeof(struct toc0_publicKey)),
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{
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TOC0_LARGE_INT(sizeof_field(struct toc0_publicKey, n)),
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{},
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TOC0_SMALL_INT(sizeof_field(struct toc0_publicKey, e)),
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{},
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},
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},
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TOC0_SMALL_EXP(3, sizeof(struct toc0_explicit3)),
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{
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TOC0_SMALL_SEQ(sizeof(struct toc0_extension)),
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{
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TOC0_SMALL_INT(sizeof_field(struct toc0_extension, digest)),
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{},
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},
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},
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},
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TOC0_LARGE_BIT(sizeof(struct toc0_sigSequence)),
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{
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TOC0_SMALL_SEQ(0),
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TOC0_LARGE_BIT(sizeof_field(struct toc0_sigSequence, signature)),
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{},
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},
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},
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};
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#define TOC0_DEFAULT_NUM_ITEMS 3
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#define TOC0_DEFAULT_HEADER_LEN \
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ALIGN( \
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sizeof(struct toc0_main_info) + \
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sizeof(struct toc0_item_info) * TOC0_DEFAULT_NUM_ITEMS + \
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sizeof(struct toc0_cert_item) + \
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sizeof(struct toc0_key_item), \
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32)
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static char *fw_key_file = "fw_key.pem";
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static char *key_item_file = "key_item.bin";
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static char *root_key_file = "root_key.pem";
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/*
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* Create a key item in @buf, containing the public keys @root_key and @fw_key,
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* and signed by the RSA key @root_key.
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*/
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static int toc0_create_key_item(uint8_t *buf, uint32_t *len,
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RSA *root_key, RSA *fw_key)
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{
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struct toc0_key_item *key_item = (void *)buf;
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uint8_t digest[SHA256_DIGEST_LENGTH];
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int ret = EXIT_FAILURE;
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unsigned int sig_len;
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int n_len, e_len;
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/* Store key 0. */
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n_len = BN_bn2bin(RSA_get0_n(root_key), key_item->key0);
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e_len = BN_bn2bin(RSA_get0_e(root_key), key_item->key0 + n_len);
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if (n_len + e_len > sizeof(key_item->key0)) {
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pr_err("Root key is too big for key item\n");
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goto err;
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}
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key_item->key0_n_len = cpu_to_le32(n_len);
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key_item->key0_e_len = cpu_to_le32(e_len);
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/* Store key 1. */
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n_len = BN_bn2bin(RSA_get0_n(fw_key), key_item->key1);
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e_len = BN_bn2bin(RSA_get0_e(fw_key), key_item->key1 + n_len);
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if (n_len + e_len > sizeof(key_item->key1)) {
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pr_err("Firmware key is too big for key item\n");
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goto err;
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}
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key_item->key1_n_len = cpu_to_le32(n_len);
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key_item->key1_e_len = cpu_to_le32(e_len);
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/* Sign the key item. */
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key_item->sig_len = cpu_to_le32(RSA_size(root_key));
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SHA256(buf, key_item->sig - buf, digest);
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if (!RSA_sign(NID_sha256, digest, sizeof(digest),
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key_item->sig, &sig_len, root_key)) {
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pr_err("Failed to sign key item\n");
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goto err;
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}
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if (sig_len != sizeof(key_item->sig)) {
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pr_err("Bad key item signature length\n");
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goto err;
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}
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*len = sizeof(*key_item);
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ret = EXIT_SUCCESS;
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err:
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return ret;
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}
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/*
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* Verify the key item in @buf, containing two public keys @key0 and @key1,
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* and signed by the RSA key @key0. If @root_key is provided, only signatures
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* by that key will be accepted. @key1 is returned in @key.
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*/
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static int toc0_verify_key_item(const uint8_t *buf, uint32_t len,
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RSA *root_key, RSA **fw_key)
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{
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struct toc0_key_item *key_item = (void *)buf;
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uint8_t digest[SHA256_DIGEST_LENGTH];
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int ret = EXIT_FAILURE;
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int n_len, e_len;
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RSA *key0 = NULL;
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RSA *key1 = NULL;
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BIGNUM *n, *e;
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if (len < sizeof(*key_item))
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goto err;
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/* Load key 0. */
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n_len = le32_to_cpu(key_item->key0_n_len);
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e_len = le32_to_cpu(key_item->key0_e_len);
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if (n_len + e_len > sizeof(key_item->key0)) {
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pr_err("Bad root key size in key item\n");
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goto err;
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}
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n = BN_bin2bn(key_item->key0, n_len, NULL);
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e = BN_bin2bn(key_item->key0 + n_len, e_len, NULL);
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key0 = RSA_new();
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if (!key0)
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goto err;
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if (!RSA_set0_key(key0, n, e, NULL))
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goto err;
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/* If a root key was provided, compare it to key 0. */
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if (root_key && (BN_cmp(n, RSA_get0_n(root_key)) ||
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BN_cmp(e, RSA_get0_e(root_key)))) {
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pr_err("Wrong root key in key item\n");
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goto err;
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}
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/* Verify the key item signature. */
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SHA256(buf, key_item->sig - buf, digest);
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if (!RSA_verify(NID_sha256, digest, sizeof(digest),
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key_item->sig, le32_to_cpu(key_item->sig_len), key0)) {
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pr_err("Bad key item signature\n");
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goto err;
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}
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if (fw_key) {
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/* Load key 1. */
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n_len = le32_to_cpu(key_item->key1_n_len);
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e_len = le32_to_cpu(key_item->key1_e_len);
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if (n_len + e_len > sizeof(key_item->key1)) {
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pr_err("Bad firmware key size in key item\n");
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goto err;
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}
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n = BN_bin2bn(key_item->key1, n_len, NULL);
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e = BN_bin2bn(key_item->key1 + n_len, e_len, NULL);
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key1 = RSA_new();
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if (!key1)
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goto err;
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if (!RSA_set0_key(key1, n, e, NULL))
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goto err;
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if (*fw_key) {
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/* If a FW key was provided, compare it to key 1. */
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if (BN_cmp(n, RSA_get0_n(*fw_key)) ||
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BN_cmp(e, RSA_get0_e(*fw_key))) {
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pr_err("Wrong firmware key in key item\n");
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goto err;
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}
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} else {
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/* Otherwise, send key1 back to the caller. */
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*fw_key = key1;
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key1 = NULL;
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}
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}
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ret = EXIT_SUCCESS;
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err:
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RSA_free(key0);
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RSA_free(key1);
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return ret;
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}
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/*
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* Create a certificate in @buf, describing the firmware with SHA256 digest
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* @digest, and signed by the RSA key @fw_key.
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*/
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static int toc0_create_cert_item(uint8_t *buf, uint32_t *len, RSA *fw_key,
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uint8_t digest[static SHA256_DIGEST_LENGTH])
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{
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struct toc0_cert_item *cert_item = (void *)buf;
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uint8_t cert_digest[SHA256_DIGEST_LENGTH];
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struct toc0_totalSequence *totalSequence;
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struct toc0_sigSequence *sigSequence;
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struct toc0_extension *extension;
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struct toc0_publicKey *publicKey;
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int ret = EXIT_FAILURE;
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unsigned int sig_len;
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memcpy(cert_item, &cert_item_template, sizeof(*cert_item));
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*len = sizeof(*cert_item);
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/*
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* Fill in the public key.
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*
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* Only 2048-bit RSA keys are supported. Since this uses a fixed-size
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* structure, it may fail for non-standard exponents.
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*/
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totalSequence = &cert_item->totalSequence;
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publicKey = &totalSequence->mainSequence.subjectPublicKeyInfo.publicKey;
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if (BN_bn2binpad(RSA_get0_n(fw_key), publicKey->n, sizeof(publicKey->n)) < 0 ||
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BN_bn2binpad(RSA_get0_e(fw_key), publicKey->e, sizeof(publicKey->e)) < 0) {
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pr_err("Firmware key is too big for certificate\n");
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goto err;
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}
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/* Fill in the firmware digest. */
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extension = &totalSequence->mainSequence.explicit3.extension;
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memcpy(&extension->digest, digest, SHA256_DIGEST_LENGTH);
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/*
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* Sign the certificate.
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*
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* In older SBROM versions (and by default in newer versions),
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* the last 4 bytes of the certificate are not signed.
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*
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* (The buffer passed to SHA256 starts at tag_mainSequence, but
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* the buffer size does not include the length of that tag.)
|
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*/
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SHA256((uint8_t *)totalSequence, sizeof(struct toc0_mainSequence), cert_digest);
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sigSequence = &totalSequence->sigSequence;
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if (!RSA_sign(NID_sha256, cert_digest, SHA256_DIGEST_LENGTH,
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sigSequence->signature, &sig_len, fw_key)) {
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pr_err("Failed to sign certificate\n");
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goto err;
|
|
}
|
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if (sig_len != sizeof(sigSequence->signature)) {
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pr_err("Bad certificate signature length\n");
|
|
goto err;
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|
}
|
|
|
|
ret = EXIT_SUCCESS;
|
|
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
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* Verify the certificate in @buf, describing the firmware with SHA256 digest
|
|
* @digest, and signed by the RSA key contained within. If @fw_key is provided,
|
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* only that key will be accepted.
|
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*
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* This function is only expected to work with images created by mkimage.
|
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*/
|
|
static int toc0_verify_cert_item(const uint8_t *buf, uint32_t len, RSA *fw_key,
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uint8_t digest[static SHA256_DIGEST_LENGTH])
|
|
{
|
|
const struct toc0_cert_item *cert_item = (const void *)buf;
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|
uint8_t cert_digest[SHA256_DIGEST_LENGTH];
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|
const struct toc0_totalSequence *totalSequence;
|
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const struct toc0_sigSequence *sigSequence;
|
|
const struct toc0_extension *extension;
|
|
const struct toc0_publicKey *publicKey;
|
|
int ret = EXIT_FAILURE;
|
|
RSA *key = NULL;
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|
BIGNUM *n, *e;
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|
|
|
/* Extract the public key from the certificate. */
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totalSequence = &cert_item->totalSequence;
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publicKey = &totalSequence->mainSequence.subjectPublicKeyInfo.publicKey;
|
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n = BN_bin2bn(publicKey->n, sizeof(publicKey->n), NULL);
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e = BN_bin2bn(publicKey->e, sizeof(publicKey->e), NULL);
|
|
key = RSA_new();
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|
if (!key)
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|
goto err;
|
|
if (!RSA_set0_key(key, n, e, NULL))
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|
goto err;
|
|
|
|
/* If a key was provided, compare it to the embedded key. */
|
|
if (fw_key && (BN_cmp(RSA_get0_n(key), RSA_get0_n(fw_key)) ||
|
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BN_cmp(RSA_get0_e(key), RSA_get0_e(fw_key)))) {
|
|
pr_err("Wrong firmware key in certificate\n");
|
|
goto err;
|
|
}
|
|
|
|
/* If a digest was provided, compare it to the embedded digest. */
|
|
extension = &totalSequence->mainSequence.explicit3.extension;
|
|
if (digest && memcmp(&extension->digest, digest, SHA256_DIGEST_LENGTH)) {
|
|
pr_err("Wrong firmware digest in certificate\n");
|
|
goto err;
|
|
}
|
|
|
|
/* Verify the certificate's signature. See the comment above. */
|
|
SHA256((uint8_t *)totalSequence, sizeof(struct toc0_mainSequence), cert_digest);
|
|
sigSequence = &totalSequence->sigSequence;
|
|
if (!RSA_verify(NID_sha256, cert_digest, SHA256_DIGEST_LENGTH,
|
|
sigSequence->signature,
|
|
sizeof(sigSequence->signature), key)) {
|
|
pr_err("Bad certificate signature\n");
|
|
goto err;
|
|
}
|
|
|
|
ret = EXIT_SUCCESS;
|
|
|
|
err:
|
|
RSA_free(key);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Always create a TOC0 containing 3 items. The extra item will be ignored on
|
|
* SoCs which do not support it.
|
|
*/
|
|
static int toc0_create(uint8_t *buf, uint32_t len, RSA *root_key, RSA *fw_key,
|
|
uint8_t *key_item, uint32_t key_item_len,
|
|
uint8_t *fw_item, uint32_t fw_item_len, uint32_t fw_addr)
|
|
{
|
|
struct toc0_main_info *main_info = (void *)buf;
|
|
struct toc0_item_info *item_info = (void *)(main_info + 1);
|
|
uint8_t digest[SHA256_DIGEST_LENGTH];
|
|
uint32_t *buf32 = (void *)buf;
|
|
RSA *orig_fw_key = fw_key;
|
|
int ret = EXIT_FAILURE;
|
|
uint32_t checksum = 0;
|
|
uint32_t item_offset;
|
|
uint32_t item_length;
|
|
int i;
|
|
|
|
/* Hash the firmware for inclusion in the certificate. */
|
|
SHA256(fw_item, fw_item_len, digest);
|
|
|
|
/* Create the main TOC0 header, containing three items. */
|
|
memcpy(main_info->name, TOC0_MAIN_INFO_NAME, sizeof(main_info->name));
|
|
main_info->magic = cpu_to_le32(TOC0_MAIN_INFO_MAGIC);
|
|
main_info->checksum = cpu_to_le32(BROM_STAMP_VALUE);
|
|
main_info->num_items = cpu_to_le32(TOC0_DEFAULT_NUM_ITEMS);
|
|
memcpy(main_info->end, TOC0_MAIN_INFO_END, sizeof(main_info->end));
|
|
|
|
/* The first item links the ROTPK to the signing key. */
|
|
item_offset = sizeof(*main_info) +
|
|
sizeof(*item_info) * TOC0_DEFAULT_NUM_ITEMS;
|
|
/* Using an existing key item avoids needing the root private key. */
|
|
if (key_item) {
|
|
item_length = sizeof(*key_item);
|
|
if (toc0_verify_key_item(key_item, item_length,
|
|
root_key, &fw_key))
|
|
goto err;
|
|
memcpy(buf + item_offset, key_item, item_length);
|
|
} else if (toc0_create_key_item(buf + item_offset, &item_length,
|
|
root_key, fw_key)) {
|
|
goto err;
|
|
}
|
|
|
|
item_info->name = cpu_to_le32(TOC0_ITEM_INFO_NAME_KEY);
|
|
item_info->offset = cpu_to_le32(item_offset);
|
|
item_info->length = cpu_to_le32(item_length);
|
|
memcpy(item_info->end, TOC0_ITEM_INFO_END, sizeof(item_info->end));
|
|
|
|
/* The second item contains a certificate signed by the firmware key. */
|
|
item_offset = item_offset + item_length;
|
|
if (toc0_create_cert_item(buf + item_offset, &item_length,
|
|
fw_key, digest))
|
|
goto err;
|
|
|
|
item_info++;
|
|
item_info->name = cpu_to_le32(TOC0_ITEM_INFO_NAME_CERT);
|
|
item_info->offset = cpu_to_le32(item_offset);
|
|
item_info->length = cpu_to_le32(item_length);
|
|
memcpy(item_info->end, TOC0_ITEM_INFO_END, sizeof(item_info->end));
|
|
|
|
/* The third item contains the actual boot code. */
|
|
item_offset = ALIGN(item_offset + item_length, 32);
|
|
item_length = fw_item_len;
|
|
if (buf + item_offset != fw_item)
|
|
memmove(buf + item_offset, fw_item, item_length);
|
|
|
|
item_info++;
|
|
item_info->name = cpu_to_le32(TOC0_ITEM_INFO_NAME_FIRMWARE);
|
|
item_info->offset = cpu_to_le32(item_offset);
|
|
item_info->length = cpu_to_le32(item_length);
|
|
item_info->load_addr = cpu_to_le32(fw_addr);
|
|
memcpy(item_info->end, TOC0_ITEM_INFO_END, sizeof(item_info->end));
|
|
|
|
/* Pad to the required block size with 0xff to be flash-friendly. */
|
|
item_offset = item_offset + item_length;
|
|
item_length = ALIGN(item_offset, PAD_SIZE) - item_offset;
|
|
memset(buf + item_offset, 0xff, item_length);
|
|
|
|
/* Fill in the total padded file length. */
|
|
item_offset = item_offset + item_length;
|
|
main_info->length = cpu_to_le32(item_offset);
|
|
|
|
/* Verify enough space was provided when creating the image. */
|
|
assert(len >= item_offset);
|
|
|
|
/* Calculate the checksum. Yes, it's that simple. */
|
|
for (i = 0; i < item_offset / 4; ++i)
|
|
checksum += le32_to_cpu(buf32[i]);
|
|
main_info->checksum = cpu_to_le32(checksum);
|
|
|
|
ret = EXIT_SUCCESS;
|
|
|
|
err:
|
|
if (fw_key != orig_fw_key)
|
|
RSA_free(fw_key);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct toc0_item_info *
|
|
toc0_find_item(const struct toc0_main_info *main_info, uint32_t name,
|
|
uint32_t *offset, uint32_t *length)
|
|
{
|
|
const struct toc0_item_info *item_info = (void *)(main_info + 1);
|
|
uint32_t item_offset, item_length;
|
|
uint32_t num_items, main_length;
|
|
int i;
|
|
|
|
num_items = le32_to_cpu(main_info->num_items);
|
|
main_length = le32_to_cpu(main_info->length);
|
|
|
|
for (i = 0; i < num_items; ++i, ++item_info) {
|
|
if (le32_to_cpu(item_info->name) != name)
|
|
continue;
|
|
|
|
item_offset = le32_to_cpu(item_info->offset);
|
|
item_length = le32_to_cpu(item_info->length);
|
|
|
|
if (item_offset > main_length ||
|
|
item_length > main_length - item_offset)
|
|
continue;
|
|
|
|
*offset = item_offset;
|
|
*length = item_length;
|
|
|
|
return item_info;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int toc0_verify(const uint8_t *buf, uint32_t len, RSA *root_key)
|
|
{
|
|
const struct toc0_main_info *main_info = (void *)buf;
|
|
const struct toc0_item_info *item_info;
|
|
uint8_t digest[SHA256_DIGEST_LENGTH];
|
|
uint32_t main_length = le32_to_cpu(main_info->length);
|
|
uint32_t checksum = BROM_STAMP_VALUE;
|
|
uint32_t *buf32 = (void *)buf;
|
|
uint32_t length, offset;
|
|
int ret = EXIT_FAILURE;
|
|
RSA *fw_key = NULL;
|
|
int i;
|
|
|
|
if (len < main_length)
|
|
goto err;
|
|
|
|
/* Verify the main header. */
|
|
if (memcmp(main_info->name, TOC0_MAIN_INFO_NAME, sizeof(main_info->name)))
|
|
goto err;
|
|
if (le32_to_cpu(main_info->magic) != TOC0_MAIN_INFO_MAGIC)
|
|
goto err;
|
|
/* Verify the checksum without modifying the buffer. */
|
|
for (i = 0; i < main_length / 4; ++i)
|
|
checksum += le32_to_cpu(buf32[i]);
|
|
if (checksum != 2 * le32_to_cpu(main_info->checksum))
|
|
goto err;
|
|
/* The length must be at least 512 byte aligned. */
|
|
if (main_length % 512)
|
|
goto err;
|
|
if (memcmp(main_info->end, TOC0_MAIN_INFO_END, sizeof(main_info->end)))
|
|
goto err;
|
|
|
|
/* Verify the key item if present (it is optional). */
|
|
item_info = toc0_find_item(main_info, TOC0_ITEM_INFO_NAME_KEY,
|
|
&offset, &length);
|
|
if (!item_info)
|
|
fw_key = root_key;
|
|
else if (toc0_verify_key_item(buf + offset, length, root_key, &fw_key))
|
|
goto err;
|
|
|
|
/* Hash the firmware to compare with the certificate. */
|
|
item_info = toc0_find_item(main_info, TOC0_ITEM_INFO_NAME_FIRMWARE,
|
|
&offset, &length);
|
|
if (!item_info) {
|
|
pr_err("Missing firmware item\n");
|
|
goto err;
|
|
}
|
|
SHA256(buf + offset, length, digest);
|
|
|
|
/* Verify the certificate item. */
|
|
item_info = toc0_find_item(main_info, TOC0_ITEM_INFO_NAME_CERT,
|
|
&offset, &length);
|
|
if (!item_info) {
|
|
pr_err("Missing certificate item\n");
|
|
goto err;
|
|
}
|
|
if (toc0_verify_cert_item(buf + offset, length, fw_key, digest))
|
|
goto err;
|
|
|
|
ret = EXIT_SUCCESS;
|
|
|
|
err:
|
|
if (fw_key != root_key)
|
|
RSA_free(fw_key);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int toc0_check_params(struct image_tool_params *params)
|
|
{
|
|
if (!params->dflag)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If a key directory was provided, look for key files there.
|
|
* Otherwise, look for them in the current directory. The key files are
|
|
* the "quoted" terms in the description below.
|
|
*
|
|
* A summary of the chain of trust on most SoCs:
|
|
* 1) eFuse contains a SHA256 digest of the public "root key".
|
|
* 2) Private "root key" signs the certificate item (generated here).
|
|
* 3) Certificate item contains a SHA256 digest of the firmware item.
|
|
*
|
|
* A summary of the chain of trust on the H6 (by default; a bit in the
|
|
* BROM_CONFIG eFuse makes it work like above):
|
|
* 1) eFuse contains a SHA256 digest of the public "root key".
|
|
* 2) Private "root key" signs the "key item" (generated here).
|
|
* 3) "Key item" contains the public "root key" and public "fw key".
|
|
* 4) Private "fw key" signs the certificate item (generated here).
|
|
* 5) Certificate item contains a SHA256 digest of the firmware item.
|
|
*
|
|
* This means there are three valid ways to generate a TOC0:
|
|
* 1) Provide the private "root key" only. This works everywhere.
|
|
* For H6, the "root key" will also be used as the "fw key".
|
|
* 2) FOR H6 ONLY: Provide the private "root key" and a separate
|
|
* private "fw key".
|
|
* 3) FOR H6 ONLY: Provide the private "fw key" and a pre-existing
|
|
* "key item" containing the corresponding public "fw key".
|
|
* In this case, the private "root key" can be kept offline. The
|
|
* "key item" can be extracted from a TOC0 image generated using
|
|
* method #2 above.
|
|
*
|
|
* Note that until the ROTPK_HASH eFuse is programmed, any "root key"
|
|
* will be accepted by the BROM.
|
|
*/
|
|
if (params->keydir) {
|
|
if (asprintf(&fw_key_file, "%s/%s", params->keydir, fw_key_file) < 0)
|
|
return -ENOMEM;
|
|
if (asprintf(&key_item_file, "%s/%s", params->keydir, key_item_file) < 0)
|
|
return -ENOMEM;
|
|
if (asprintf(&root_key_file, "%s/%s", params->keydir, root_key_file) < 0)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int toc0_verify_header(unsigned char *buf, int image_size,
|
|
struct image_tool_params *params)
|
|
{
|
|
int ret = EXIT_FAILURE;
|
|
RSA *root_key = NULL;
|
|
FILE *fp;
|
|
|
|
/* A root public key is optional. */
|
|
fp = fopen(root_key_file, "rb");
|
|
if (fp) {
|
|
pr_info("Verifying image with existing root key\n");
|
|
root_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
|
|
if (!root_key)
|
|
root_key = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL);
|
|
fclose(fp);
|
|
if (!root_key) {
|
|
pr_err("Failed to read public key from '%s'\n",
|
|
root_key_file);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
ret = toc0_verify(buf, image_size, root_key);
|
|
|
|
err:
|
|
RSA_free(root_key);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const char *toc0_item_name(uint32_t name)
|
|
{
|
|
if (name == TOC0_ITEM_INFO_NAME_CERT)
|
|
return "Certificate";
|
|
if (name == TOC0_ITEM_INFO_NAME_FIRMWARE)
|
|
return "Firmware";
|
|
if (name == TOC0_ITEM_INFO_NAME_KEY)
|
|
return "Key";
|
|
return "(unknown)";
|
|
}
|
|
|
|
static void toc0_print_header(const void *buf)
|
|
{
|
|
const struct toc0_main_info *main_info = buf;
|
|
const struct toc0_item_info *item_info = (void *)(main_info + 1);
|
|
uint32_t head_length, main_length, num_items;
|
|
uint32_t item_offset, item_length, item_name;
|
|
int load_addr = -1;
|
|
int i;
|
|
|
|
num_items = le32_to_cpu(main_info->num_items);
|
|
head_length = sizeof(*main_info) + num_items * sizeof(*item_info);
|
|
main_length = le32_to_cpu(main_info->length);
|
|
|
|
printf("Allwinner TOC0 Image\n"
|
|
"Size: %d bytes\n"
|
|
"Contents: %d items\n"
|
|
" 00000000:%08x Headers\n",
|
|
main_length, num_items, head_length);
|
|
|
|
for (i = 0; i < num_items; ++i, ++item_info) {
|
|
item_offset = le32_to_cpu(item_info->offset);
|
|
item_length = le32_to_cpu(item_info->length);
|
|
item_name = le32_to_cpu(item_info->name);
|
|
|
|
if (item_name == TOC0_ITEM_INFO_NAME_FIRMWARE)
|
|
load_addr = le32_to_cpu(item_info->load_addr);
|
|
|
|
printf(" %08x:%08x %s\n",
|
|
item_offset, item_length,
|
|
toc0_item_name(item_name));
|
|
}
|
|
|
|
if (num_items && item_offset + item_length < main_length) {
|
|
item_offset = item_offset + item_length;
|
|
item_length = main_length - item_offset;
|
|
|
|
printf(" %08x:%08x Padding\n",
|
|
item_offset, item_length);
|
|
}
|
|
|
|
if (load_addr != -1)
|
|
printf("Load address: 0x%08x\n", load_addr);
|
|
}
|
|
|
|
static void toc0_set_header(void *buf, struct stat *sbuf, int ifd,
|
|
struct image_tool_params *params)
|
|
{
|
|
uint32_t key_item_len = 0;
|
|
uint8_t *key_item = NULL;
|
|
int ret = EXIT_FAILURE;
|
|
RSA *root_key = NULL;
|
|
RSA *fw_key = NULL;
|
|
FILE *fp;
|
|
|
|
/* Either a key item or the root private key is required. */
|
|
fp = fopen(key_item_file, "rb");
|
|
if (fp) {
|
|
pr_info("Creating image using existing key item\n");
|
|
key_item_len = sizeof(struct toc0_key_item);
|
|
key_item = OPENSSL_malloc(key_item_len);
|
|
if (!key_item || fread(key_item, key_item_len, 1, fp) != 1) {
|
|
pr_err("Failed to read key item from '%s'\n",
|
|
root_key_file);
|
|
goto err;
|
|
}
|
|
fclose(fp);
|
|
fp = NULL;
|
|
}
|
|
|
|
fp = fopen(root_key_file, "rb");
|
|
if (fp) {
|
|
root_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
|
|
if (!root_key)
|
|
root_key = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL);
|
|
fclose(fp);
|
|
fp = NULL;
|
|
}
|
|
|
|
/* When using an existing key item, the root key is optional. */
|
|
if (!key_item && (!root_key || !RSA_get0_d(root_key))) {
|
|
pr_err("Failed to read private key from '%s'\n",
|
|
root_key_file);
|
|
pr_info("Try 'openssl genrsa -out root_key.pem'\n");
|
|
goto err;
|
|
}
|
|
|
|
/* The certificate/firmware private key is always required. */
|
|
fp = fopen(fw_key_file, "rb");
|
|
if (fp) {
|
|
fw_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
|
|
fclose(fp);
|
|
fp = NULL;
|
|
}
|
|
if (!fw_key) {
|
|
/* If the root key is a private key, it can be used instead. */
|
|
if (root_key && RSA_get0_d(root_key)) {
|
|
pr_info("Using root key as firmware key\n");
|
|
fw_key = root_key;
|
|
} else {
|
|
pr_err("Failed to read private key from '%s'\n",
|
|
fw_key_file);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
/* Warn about potential compatibility issues. */
|
|
if (key_item || fw_key != root_key)
|
|
pr_warn("Only H6 supports separate root and firmware keys\n");
|
|
|
|
ret = toc0_create(buf, params->file_size, root_key, fw_key,
|
|
key_item, key_item_len,
|
|
buf + TOC0_DEFAULT_HEADER_LEN,
|
|
params->orig_file_size, params->addr);
|
|
|
|
err:
|
|
OPENSSL_free(key_item);
|
|
OPENSSL_free(root_key);
|
|
if (fw_key != root_key)
|
|
OPENSSL_free(fw_key);
|
|
if (fp)
|
|
fclose(fp);
|
|
|
|
if (ret != EXIT_SUCCESS)
|
|
exit(ret);
|
|
}
|
|
|
|
static int toc0_check_image_type(uint8_t type)
|
|
{
|
|
return type == IH_TYPE_SUNXI_TOC0 ? 0 : 1;
|
|
}
|
|
|
|
static int toc0_vrec_header(struct image_tool_params *params,
|
|
struct image_type_params *tparams)
|
|
{
|
|
tparams->hdr = calloc(tparams->header_size, 1);
|
|
|
|
/* Save off the unpadded data size for SHA256 calculation. */
|
|
params->orig_file_size = params->file_size - TOC0_DEFAULT_HEADER_LEN;
|
|
|
|
/* Return padding to 8K blocks. */
|
|
return ALIGN(params->file_size, PAD_SIZE) - params->file_size;
|
|
}
|
|
|
|
U_BOOT_IMAGE_TYPE(
|
|
sunxi_toc0,
|
|
"Allwinner TOC0 Boot Image support",
|
|
TOC0_DEFAULT_HEADER_LEN,
|
|
NULL,
|
|
toc0_check_params,
|
|
toc0_verify_header,
|
|
toc0_print_header,
|
|
toc0_set_header,
|
|
NULL,
|
|
toc0_check_image_type,
|
|
NULL,
|
|
toc0_vrec_header
|
|
);
|