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u-boot/board/freescale/common/fsl_validate.c
Tom Rini 17ead040d4 Audit <flash.h> inclusion 
A large number of files include <flash.h> as it used to be how various
SPI flash related functions were found, or for other reasons entirely.
In order to migrate some further CONFIG symbols to Kconfig we need to
not include flash.h in cases where we don't have a NOR flash of some
sort enabled.  Furthermore, in cases where we are in common code and it
doesn't make sense to try and further refactor the code itself in to new
files we need to guard this inclusion.

Signed-off-by: Tom Rini <trini@konsulko.com>
2022-08-04 16:18:47 -04:00

967 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2015 Freescale Semiconductor, Inc.
* Copyright 2021 NXP
*/
#include <common.h>
#include <dm.h>
#include <fsl_validate.h>
#include <fsl_secboot_err.h>
#include <fsl_sfp.h>
#include <fsl_sec.h>
#include <command.h>
#include <log.h>
#include <malloc.h>
#include <u-boot/rsa-mod-exp.h>
#include <hash.h>
#include <fsl_secboot_err.h>
#ifdef CONFIG_ARCH_LS1021A
#include <asm/arch/immap_ls102xa.h>
#endif
#define SHA256_BITS 256
#define SHA256_BYTES (256/8)
#define SHA256_NIBBLES (256/4)
#define NUM_HEX_CHARS (sizeof(ulong) * 2)
#define CHECK_KEY_LEN(key_len) (((key_len) == 2 * KEY_SIZE_BYTES / 4) || \
((key_len) == 2 * KEY_SIZE_BYTES / 2) || \
((key_len) == 2 * KEY_SIZE_BYTES))
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
/* Global data structure */
static struct fsl_secboot_glb glb;
#endif
/* This array contains DER value for SHA-256 */
static const u8 hash_identifier[] = { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60,
0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00,
0x04, 0x20
};
static u8 hash_val[SHA256_BYTES];
#ifdef CONFIG_ESBC_HDR_LS
/* New Barker Code for LS ESBC Header */
static const u8 barker_code[ESBC_BARKER_LEN] = { 0x12, 0x19, 0x20, 0x01 };
#else
static const u8 barker_code[ESBC_BARKER_LEN] = { 0x68, 0x39, 0x27, 0x81 };
#endif
void branch_to_self(void) __attribute__ ((noreturn));
/*
* This function will put core in infinite loop.
* This will be called when the ESBC can not proceed further due
* to some unknown errors.
*/
void branch_to_self(void)
{
printf("Core is in infinite loop due to errors.\n");
self:
goto self;
}
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
static u32 check_ie(struct fsl_secboot_img_priv *img)
{
if (img->hdr.ie_flag & IE_FLAG_MASK)
return 1;
return 0;
}
/* This function returns the CSF Header Address of uboot
* For MPC85xx based platforms, the LAW mapping for NOR
* flash changes in uboot code. Hence the offset needs
* to be calculated and added to the new NOR flash base
* address
*/
#if defined(CONFIG_MPC85xx)
#include <flash.h>
int get_csf_base_addr(u32 *csf_addr, u32 *flash_base_addr)
{
struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
u32 csf_hdr_addr = in_be32(&gur->scratchrw[0]);
u32 csf_flash_offset = csf_hdr_addr & ~(CONFIG_SYS_PBI_FLASH_BASE);
u32 flash_addr, addr;
int found = 0;
int i = 0;
for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
flash_addr = flash_info[i].start[0];
addr = flash_info[i].start[0] + csf_flash_offset;
if (memcmp((u8 *)addr, barker_code, ESBC_BARKER_LEN) == 0) {
debug("Barker found on addr %x\n", addr);
found = 1;
break;
}
}
if (!found)
return -1;
*csf_addr = addr;
*flash_base_addr = flash_addr;
return 0;
}
#else
/* For platforms like LS1020, correct flash address is present in
* the header. So the function reqturns flash base address as 0
*/
int get_csf_base_addr(u32 *csf_addr, u32 *flash_base_addr)
{
struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
u32 csf_hdr_addr = in_be32(&gur->scratchrw[0]);
if (memcmp((u8 *)(uintptr_t)csf_hdr_addr,
barker_code, ESBC_BARKER_LEN))
return -1;
*csf_addr = csf_hdr_addr;
*flash_base_addr = 0;
return 0;
}
#endif
#if defined(CONFIG_ESBC_HDR_LS)
static int get_ie_info_addr(uintptr_t *ie_addr)
{
struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
/* For LS-CH3, the address of IE Table is
* stated in Scratch13 and scratch14 of DCFG.
* Bootrom validates this table while validating uboot.
* DCFG is LE*/
*ie_addr = in_le32(&gur->scratchrw[SCRATCH_IE_HIGH_ADR - 1]);
*ie_addr = *ie_addr << 32;
*ie_addr |= in_le32(&gur->scratchrw[SCRATCH_IE_LOW_ADR - 1]);
return 0;
}
#else /* CONFIG_ESBC_HDR_LS */
static int get_ie_info_addr(uintptr_t *ie_addr)
{
struct fsl_secboot_img_hdr *hdr;
struct fsl_secboot_sg_table *sg_tbl;
u32 flash_base_addr, csf_addr;
if (get_csf_base_addr(&csf_addr, &flash_base_addr))
return -1;
hdr = (struct fsl_secboot_img_hdr *)(uintptr_t)csf_addr;
/* For SoC's with Trust Architecture v1 with corenet bus
* the sg table field in CSF header has absolute address
* for sg table in memory. In other Trust Architecture,
* this field specifies the offset of sg table from the
* base address of CSF Header
*/
#if defined(CONFIG_FSL_TRUST_ARCH_v1) && defined(CONFIG_FSL_CORENET)
sg_tbl = (struct fsl_secboot_sg_table *)
(((u32)hdr->psgtable & ~(CONFIG_SYS_PBI_FLASH_BASE)) +
flash_base_addr);
#else
sg_tbl = (struct fsl_secboot_sg_table *)(uintptr_t)(csf_addr +
(u32)hdr->psgtable);
#endif
/* IE Key Table is the first entry in the SG Table */
#if defined(CONFIG_MPC85xx)
*ie_addr = (uintptr_t)((sg_tbl->src_addr &
~(CONFIG_SYS_PBI_FLASH_BASE)) +
flash_base_addr);
#else
*ie_addr = (uintptr_t)sg_tbl->src_addr;
#endif
debug("IE Table address is %lx\n", *ie_addr);
return 0;
}
#endif /* CONFIG_ESBC_HDR_LS */
#endif
#ifdef CONFIG_KEY_REVOCATION
/* This function checks srk_table_flag in header and set/reset srk_flag.*/
static u32 check_srk(struct fsl_secboot_img_priv *img)
{
#ifdef CONFIG_ESBC_HDR_LS
/* In LS, No SRK Flag as SRK is always present if IE not present*/
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
return !check_ie(img);
#endif
return 1;
#else
if (img->hdr.len_kr.srk_table_flag & SRK_FLAG)
return 1;
return 0;
#endif
}
/* This function returns ospr's key_revoc values.*/
static u32 get_key_revoc(void)
{
struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
return (sfp_in32(&sfp_regs->ospr) & OSPR_KEY_REVOC_MASK) >>
OSPR_KEY_REVOC_SHIFT;
}
/* This function checks if selected key is revoked or not.*/
static u32 is_key_revoked(u32 keynum, u32 rev_flag)
{
if (keynum == UNREVOCABLE_KEY)
return 0;
if ((u32)(1 << (ALIGN_REVOC_KEY - keynum)) & rev_flag)
return 1;
return 0;
}
/* It read validates srk_table key lengths.*/
static u32 read_validate_srk_tbl(struct fsl_secboot_img_priv *img)
{
int i = 0;
u32 ret, key_num, key_revoc_flag, size;
struct fsl_secboot_img_hdr *hdr = &img->hdr;
void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
if ((hdr->len_kr.num_srk == 0) ||
(hdr->len_kr.num_srk > MAX_KEY_ENTRIES))
return ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY;
key_num = hdr->len_kr.srk_sel;
if (key_num == 0 || key_num > hdr->len_kr.num_srk)
return ERROR_ESBC_CLIENT_HEADER_INVALID_KEY_NUM;
/* Get revoc key from sfp */
key_revoc_flag = get_key_revoc();
ret = is_key_revoked(key_num, key_revoc_flag);
if (ret)
return ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED;
size = hdr->len_kr.num_srk * sizeof(struct srk_table);
memcpy(&img->srk_tbl, esbc + hdr->srk_tbl_off, size);
for (i = 0; i < hdr->len_kr.num_srk; i++) {
if (!CHECK_KEY_LEN(img->srk_tbl[i].key_len))
return ERROR_ESBC_CLIENT_HEADER_INV_SRK_ENTRY_KEYLEN;
}
img->key_len = img->srk_tbl[key_num - 1].key_len;
memcpy(&img->img_key, &(img->srk_tbl[key_num - 1].pkey),
img->key_len);
return 0;
}
#endif
#ifndef CONFIG_ESBC_HDR_LS
static u32 read_validate_single_key(struct fsl_secboot_img_priv *img)
{
struct fsl_secboot_img_hdr *hdr = &img->hdr;
void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
/* check key length */
if (!CHECK_KEY_LEN(hdr->key_len))
return ERROR_ESBC_CLIENT_HEADER_KEY_LEN;
memcpy(&img->img_key, esbc + hdr->pkey, hdr->key_len);
img->key_len = hdr->key_len;
return 0;
}
#endif /* CONFIG_ESBC_HDR_LS */
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
static void install_ie_tbl(uintptr_t ie_tbl_addr,
struct fsl_secboot_img_priv *img)
{
/* Copy IE tbl to Global Data */
memcpy(&glb.ie_tbl, (u8 *)ie_tbl_addr, sizeof(struct ie_key_info));
img->ie_addr = (uintptr_t)&glb.ie_tbl;
glb.ie_addr = img->ie_addr;
}
static u32 read_validate_ie_tbl(struct fsl_secboot_img_priv *img)
{
struct fsl_secboot_img_hdr *hdr = &img->hdr;
u32 ie_key_len, ie_revoc_flag, ie_num;
struct ie_key_info *ie_info;
if (!img->ie_addr) {
if (get_ie_info_addr(&img->ie_addr))
return ERROR_IE_TABLE_NOT_FOUND;
else
install_ie_tbl(img->ie_addr, img);
}
ie_info = (struct ie_key_info *)(uintptr_t)img->ie_addr;
if (ie_info->num_keys == 0 || ie_info->num_keys > 32)
return ERROR_ESBC_CLIENT_HEADER_INVALID_IE_NUM_ENTRY;
ie_num = hdr->ie_key_sel;
if (ie_num == 0 || ie_num > ie_info->num_keys)
return ERROR_ESBC_CLIENT_HEADER_INVALID_IE_KEY_NUM;
ie_revoc_flag = ie_info->key_revok;
if ((u32)(1 << (ie_num - 1)) & ie_revoc_flag)
return ERROR_ESBC_CLIENT_HEADER_IE_KEY_REVOKED;
ie_key_len = ie_info->ie_key_tbl[ie_num - 1].key_len;
if (!CHECK_KEY_LEN(ie_key_len))
return ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN;
memcpy(&img->img_key, &(ie_info->ie_key_tbl[ie_num - 1].pkey),
ie_key_len);
img->key_len = ie_key_len;
return 0;
}
#endif
/* This function return length of public key.*/
static inline u32 get_key_len(struct fsl_secboot_img_priv *img)
{
return img->key_len;
}
/*
* Handles the ESBC uboot client header verification failure.
* This function handles all the errors which might occur in the
* parsing and checking of ESBC uboot client header. It will also
* set the error bits in the SEC_MON.
*/
static void fsl_secboot_header_verification_failure(void)
{
struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
/* 29th bit of OSPR is ITS */
u32 its = sfp_in32(&sfp_regs->ospr) >> 2;
if (its == 1)
set_sec_mon_state(HPSR_SSM_ST_SOFT_FAIL);
else
set_sec_mon_state(HPSR_SSM_ST_NON_SECURE);
printf("Generating reset request\n");
do_reset(NULL, 0, 0, NULL);
/* If reset doesn't coocur, halt execution */
do_esbc_halt(NULL, 0, 0, NULL);
}
/*
* Handles the ESBC uboot client image verification failure.
* This function handles all the errors which might occur in the
* public key hash comparison and signature verification of
* ESBC uboot client image. It will also
* set the error bits in the SEC_MON.
*/
static void fsl_secboot_image_verification_failure(void)
{
struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
u32 its = (sfp_in32(&sfp_regs->ospr) & ITS_MASK) >> ITS_BIT;
if (its == 1) {
set_sec_mon_state(HPSR_SSM_ST_SOFT_FAIL);
printf("Generating reset request\n");
do_reset(NULL, 0, 0, NULL);
/* If reset doesn't coocur, halt execution */
do_esbc_halt(NULL, 0, 0, NULL);
} else {
set_sec_mon_state(HPSR_SSM_ST_NON_SECURE);
}
}
static void fsl_secboot_bootscript_parse_failure(void)
{
fsl_secboot_header_verification_failure();
}
/*
* Handles the errors in esbc boot.
* This function handles all the errors which might occur in the
* esbc boot phase. It will call the appropriate api to log the
* errors and set the error bits in the SEC_MON.
*/
void fsl_secboot_handle_error(int error)
{
#ifndef CONFIG_SPL_BUILD
const struct fsl_secboot_errcode *e;
for (e = fsl_secboot_errcodes; e->errcode != ERROR_ESBC_CLIENT_MAX;
e++) {
if (e->errcode == error)
printf("ERROR :: %x :: %s\n", error, e->name);
}
#else
printf("ERROR :: %x\n", error);
#endif
/* If Boot Mode is secure, transition the SNVS state and issue
* reset based on type of failure and ITS setting.
* If Boot mode is non-secure, return from this function.
*/
if (fsl_check_boot_mode_secure() == 0)
return;
switch (error) {
case ERROR_ESBC_CLIENT_HEADER_BARKER:
case ERROR_ESBC_CLIENT_HEADER_IMG_SIZE:
case ERROR_ESBC_CLIENT_HEADER_KEY_LEN:
case ERROR_ESBC_CLIENT_HEADER_SIG_LEN:
case ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN:
case ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1:
case ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2:
case ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD:
case ERROR_ESBC_CLIENT_HEADER_SG_ESBC_EP:
case ERROR_ESBC_CLIENT_HEADER_SG_ENTIRES_BAD:
case ERROR_KEY_TABLE_NOT_FOUND:
#ifdef CONFIG_KEY_REVOCATION
case ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED:
case ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY:
case ERROR_ESBC_CLIENT_HEADER_INVALID_KEY_NUM:
case ERROR_ESBC_CLIENT_HEADER_INV_SRK_ENTRY_KEYLEN:
#endif
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
/*@fallthrough@*/
case ERROR_ESBC_CLIENT_HEADER_IE_KEY_REVOKED:
case ERROR_ESBC_CLIENT_HEADER_INVALID_IE_NUM_ENTRY:
case ERROR_ESBC_CLIENT_HEADER_INVALID_IE_KEY_NUM:
case ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN:
case ERROR_IE_TABLE_NOT_FOUND:
#endif
fsl_secboot_header_verification_failure();
break;
case ERROR_ESBC_SEC_RESET:
case ERROR_ESBC_SEC_DEQ:
case ERROR_ESBC_SEC_ENQ:
case ERROR_ESBC_SEC_DEQ_TO:
case ERROR_ESBC_SEC_JOBQ_STATUS:
case ERROR_ESBC_CLIENT_HASH_COMPARE_KEY:
case ERROR_ESBC_CLIENT_HASH_COMPARE_EM:
fsl_secboot_image_verification_failure();
break;
case ERROR_ESBC_MISSING_BOOTM:
fsl_secboot_bootscript_parse_failure();
break;
case ERROR_ESBC_WRONG_CMD:
default:
branch_to_self();
break;
}
}
static void fsl_secblk_handle_error(int error)
{
switch (error) {
case ERROR_ESBC_SEC_ENQ:
fsl_secboot_handle_error(ERROR_ESBC_SEC_ENQ);
break;
case ERROR_ESBC_SEC_DEQ:
fsl_secboot_handle_error(ERROR_ESBC_SEC_DEQ);
break;
case ERROR_ESBC_SEC_DEQ_TO:
fsl_secboot_handle_error(ERROR_ESBC_SEC_DEQ_TO);
break;
default:
printf("Job Queue Output status %x\n", error);
fsl_secboot_handle_error(ERROR_ESBC_SEC_JOBQ_STATUS);
break;
}
}
/*
* Calculate hash of key obtained via offset present in ESBC uboot
* client hdr. This function calculates the hash of key which is obtained
* through offset present in ESBC uboot client header.
*/
static int calc_img_key_hash(struct fsl_secboot_img_priv *img)
{
struct hash_algo *algo;
void *ctx;
int i, srk = 0;
int ret = 0;
const char *algo_name = "sha256";
/* Calculate hash of the esbc key */
ret = hash_progressive_lookup_algo(algo_name, &algo);
if (ret)
return ret;
ret = algo->hash_init(algo, &ctx);
if (ret)
return ret;
/* Update hash for ESBC key */
#ifdef CONFIG_KEY_REVOCATION
if (check_srk(img)) {
ret = algo->hash_update(algo, ctx,
(u8 *)(uintptr_t)(img->ehdrloc + img->hdr.srk_tbl_off),
img->hdr.len_kr.num_srk * sizeof(struct srk_table), 1);
srk = 1;
}
#endif
if (!srk)
ret = algo->hash_update(algo, ctx,
img->img_key, img->key_len, 1);
if (ret)
return ret;
/* Copy hash at destination buffer */
ret = algo->hash_finish(algo, ctx, hash_val, algo->digest_size);
if (ret) {
free(ctx);
return ret;
}
for (i = 0; i < SHA256_BYTES; i++)
img->img_key_hash[i] = hash_val[i];
return 0;
}
/*
* Calculate hash of ESBC hdr and ESBC. This function calculates the
* single hash of ESBC header and ESBC image. If SG flag is on, all
* SG entries are also hashed alongwith the complete SG table.
*/
static int calc_esbchdr_esbc_hash(struct fsl_secboot_img_priv *img)
{
struct hash_algo *algo;
void *ctx;
int ret = 0;
int key_hash = 0;
const char *algo_name = "sha256";
/* Calculate the hash of the ESBC */
ret = hash_progressive_lookup_algo(algo_name, &algo);
if (ret)
return ret;
ret = algo->hash_init(algo, &ctx);
/* Copy hash at destination buffer */
if (ret)
return ret;
/* Update hash for CSF Header */
ret = algo->hash_update(algo, ctx,
(u8 *)&img->hdr, sizeof(struct fsl_secboot_img_hdr), 0);
if (ret)
return ret;
/* Update the hash with that of srk table if srk flag is 1
* If IE Table is selected, key is not added in the hash
* If neither srk table nor IE key table available, add key
* from header in the hash calculation
*/
#ifdef CONFIG_KEY_REVOCATION
if (check_srk(img)) {
ret = algo->hash_update(algo, ctx,
(u8 *)(uintptr_t)(img->ehdrloc + img->hdr.srk_tbl_off),
img->hdr.len_kr.num_srk * sizeof(struct srk_table), 0);
key_hash = 1;
}
#endif
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
if (!key_hash && check_ie(img))
key_hash = 1;
#endif
#ifndef CONFIG_ESBC_HDR_LS
/* No single key support in LS ESBC header */
if (!key_hash) {
ret = algo->hash_update(algo, ctx,
img->img_key, img->hdr.key_len, 0);
key_hash = 1;
}
#endif
if (ret)
return ret;
if (!key_hash) {
free(ctx);
return ERROR_KEY_TABLE_NOT_FOUND;
}
/* Update hash for actual Image */
ret = algo->hash_update(algo, ctx,
(u8 *)(*(img->img_addr_ptr)), img->img_size, 1);
if (ret)
return ret;
/* Copy hash at destination buffer */
ret = algo->hash_finish(algo, ctx, hash_val, algo->digest_size);
if (ret) {
free(ctx);
return ret;
}
return 0;
}
/*
* Construct encoded hash EM' wrt PKCSv1.5. This function calculates the
* pointers for padding, DER value and hash. And finally, constructs EM'
* which includes hash of complete CSF header and ESBC image. If SG flag
* is on, hash of SG table and entries is also included.
*/
static void construct_img_encoded_hash_second(struct fsl_secboot_img_priv *img)
{
/*
* RSA PKCSv1.5 encoding format for encoded message is below
* EM = 0x0 || 0x1 || PS || 0x0 || DER || Hash
* PS is Padding String
* DER is DER value for SHA-256
* Hash is SHA-256 hash
* *********************************************************
* representative points to first byte of EM initially and is
* filled with 0x0
* representative is incremented by 1 and second byte is filled
* with 0x1
* padding points to third byte of EM
* digest points to full length of EM - 32 bytes
* hash_id (DER value) points to 19 bytes before pDigest
* separator is one byte which separates padding and DER
*/
size_t len;
u8 *representative;
u8 *padding, *digest;
u8 *hash_id, *separator;
int i;
len = (get_key_len(img) / 2) - 1;
representative = img->img_encoded_hash_second;
representative[0] = 0;
representative[1] = 1; /* block type 1 */
padding = &representative[2];
digest = &representative[1] + len - 32;
hash_id = digest - sizeof(hash_identifier);
separator = hash_id - 1;
/* fill padding area pointed by padding with 0xff */
memset(padding, 0xff, separator - padding);
/* fill byte pointed by separator */
*separator = 0;
/* fill SHA-256 DER value pointed by HashId */
memcpy(hash_id, hash_identifier, sizeof(hash_identifier));
/* fill hash pointed by Digest */
for (i = 0; i < SHA256_BYTES; i++)
digest[i] = hash_val[i];
}
/*
* Reads and validates the ESBC client header.
* This function reads key and signature from the ESBC client header.
* If Scatter/Gather flag is on, lengths and offsets of images
* present as SG entries are also read. This function also checks
* whether the header is valid or not.
*/
static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
{
struct fsl_secboot_img_hdr *hdr = &img->hdr;
void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
u8 *k, *s;
u32 ret = 0;
int key_found = 0;
/* check barker code */
if (memcmp(hdr->barker, barker_code, ESBC_BARKER_LEN))
return ERROR_ESBC_CLIENT_HEADER_BARKER;
/* If Image Address is not passed as argument to function,
* then Address and Size must be read from the Header.
*/
if (*(img->img_addr_ptr) == 0) {
#ifdef CONFIG_ESBC_ADDR_64BIT
*(img->img_addr_ptr) = hdr->pimg64;
#else
*(img->img_addr_ptr) = hdr->pimg;
#endif
}
if (!hdr->img_size)
return ERROR_ESBC_CLIENT_HEADER_IMG_SIZE;
img->img_size = hdr->img_size;
/* Key checking*/
#ifdef CONFIG_KEY_REVOCATION
if (check_srk(img)) {
ret = read_validate_srk_tbl(img);
if (ret != 0)
return ret;
key_found = 1;
}
#endif
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
if (!key_found && check_ie(img)) {
ret = read_validate_ie_tbl(img);
if (ret != 0)
return ret;
key_found = 1;
}
#endif
#ifndef CONFIG_ESBC_HDR_LS
/* Single Key Feature not available in LS ESBC Header */
if (key_found == 0) {
ret = read_validate_single_key(img);
if (ret != 0)
return ret;
key_found = 1;
}
#endif
if (!key_found)
return ERROR_KEY_TABLE_NOT_FOUND;
/* check signaure */
if (get_key_len(img) == 2 * hdr->sign_len) {
/* check signature length */
if (!((hdr->sign_len == KEY_SIZE_BYTES / 4) ||
(hdr->sign_len == KEY_SIZE_BYTES / 2) ||
(hdr->sign_len == KEY_SIZE_BYTES)))
return ERROR_ESBC_CLIENT_HEADER_SIG_LEN;
} else {
return ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN;
}
memcpy(&img->img_sign, esbc + hdr->psign, hdr->sign_len);
/* No SG support in LS-CH3 */
#ifndef CONFIG_ESBC_HDR_LS
/* No SG support */
if (hdr->sg_flag)
return ERROR_ESBC_CLIENT_HEADER_SG;
#endif
/* modulus most significant bit should be set */
k = (u8 *)&img->img_key;
if ((k[0] & 0x80) == 0)
return ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1;
/* modulus value should be odd */
if ((k[get_key_len(img) / 2 - 1] & 0x1) == 0)
return ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2;
/* Check signature value < modulus value */
s = (u8 *)&img->img_sign;
if (!(memcmp(s, k, hdr->sign_len) < 0))
return ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD;
return ESBC_VALID_HDR;
}
static inline int str2longbe(const char *p, ulong *num)
{
char *endptr;
ulong tmp;
if (!p) {
return 0;
} else {
tmp = hextoul(p, &endptr);
if (sizeof(ulong) == 4)
*num = cpu_to_be32(tmp);
else
*num = cpu_to_be64(tmp);
}
return *p != '\0' && *endptr == '\0';
}
/* Function to calculate the ESBC Image Hash
* and hash from Digital signature.
* The Two hash's are compared to yield the
* result of signature validation.
*/
static int calculate_cmp_img_sig(struct fsl_secboot_img_priv *img)
{
int ret;
uint32_t key_len;
struct key_prop prop;
#if !defined(USE_HOSTCC)
struct udevice *mod_exp_dev;
#endif
ret = calc_esbchdr_esbc_hash(img);
if (ret)
return ret;
/* Construct encoded hash EM' wrt PKCSv1.5 */
construct_img_encoded_hash_second(img);
/* Fill prop structure for public key */
memset(&prop, 0, sizeof(struct key_prop));
key_len = get_key_len(img) / 2;
prop.modulus = img->img_key;
prop.public_exponent = img->img_key + key_len;
prop.num_bits = key_len * 8;
prop.exp_len = key_len;
ret = uclass_get_device(UCLASS_MOD_EXP, 0, &mod_exp_dev);
if (ret) {
printf("RSA: Can't find Modular Exp implementation\n");
return -EINVAL;
}
ret = rsa_mod_exp(mod_exp_dev, img->img_sign, img->hdr.sign_len,
&prop, img->img_encoded_hash);
if (ret)
return ret;
/*
* compare the encoded messages EM' and EM wrt RSA PKCSv1.5
* memcmp returns zero on success
* memcmp returns non-zero on failure
*/
ret = memcmp(&img->img_encoded_hash_second, &img->img_encoded_hash,
img->hdr.sign_len);
if (ret)
return ERROR_ESBC_CLIENT_HASH_COMPARE_EM;
return 0;
}
/* Function to initialize img priv and global data structure
*/
static int secboot_init(struct fsl_secboot_img_priv **img_ptr)
{
*img_ptr = malloc(sizeof(struct fsl_secboot_img_priv));
struct fsl_secboot_img_priv *img = *img_ptr;
if (!img)
return -ENOMEM;
memset(img, 0, sizeof(struct fsl_secboot_img_priv));
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
if (glb.ie_addr)
img->ie_addr = glb.ie_addr;
#endif
return 0;
}
/* haddr - Address of the header of image to be validated.
* arg_hash_str - Option hash string. If provided, this
* overrides the key hash in the SFP fuses.
* img_addr_ptr - Optional pointer to address of image to be validated.
* If non zero addr, this overrides the addr of image in header,
* otherwise updated to image addr in header.
* Acts as both input and output of function.
* This pointer shouldn't be NULL.
*/
int fsl_secboot_validate(uintptr_t haddr, char *arg_hash_str,
uintptr_t *img_addr_ptr)
{
struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
ulong hash[SHA256_BYTES/sizeof(ulong)];
char hash_str[NUM_HEX_CHARS + 1];
struct fsl_secboot_img_priv *img;
struct fsl_secboot_img_hdr *hdr;
void *esbc;
int ret, i, hash_cmd = 0;
u32 srk_hash[8];
if (strlen(arg_hash_str) != 0) {
const char *cp = arg_hash_str;
int i = 0;
if (*cp == '0' && *(cp + 1) == 'x')
cp += 2;
/* The input string expected is in hex, where
* each 4 bits would be represented by a hex
* sha256 hash is 256 bits long, which would mean
* num of characters = 256 / 4
*/
if (strlen(cp) != SHA256_NIBBLES) {
printf("%s is not a 256 bits hex string as expected\n",
arg_hash_str);
return -1;
}
for (i = 0; i < sizeof(hash)/sizeof(ulong); i++) {
strncpy(hash_str, cp + (i * NUM_HEX_CHARS),
NUM_HEX_CHARS);
hash_str[NUM_HEX_CHARS] = '\0';
if (!str2longbe(hash_str, &hash[i])) {
printf("%s is not a 256 bits hex string ",
arg_hash_str);
return -1;
}
}
hash_cmd = 1;
}
ret = secboot_init(&img);
if (ret)
goto exit;
/* Update the information in Private Struct */
hdr = &img->hdr;
img->ehdrloc = haddr;
img->img_addr_ptr = img_addr_ptr;
esbc = (u8 *)img->ehdrloc;
memcpy(hdr, esbc, sizeof(struct fsl_secboot_img_hdr));
/* read and validate esbc header */
ret = read_validate_esbc_client_header(img);
if (ret != ESBC_VALID_HDR) {
fsl_secboot_handle_error(ret);
goto exit;
}
/* SRKH present in SFP */
for (i = 0; i < NUM_SRKH_REGS; i++)
srk_hash[i] = srk_in32(&sfp_regs->srk_hash[i]);
/*
* Calculate hash of key obtained via offset present in
* ESBC uboot client hdr
*/
ret = calc_img_key_hash(img);
if (ret) {
fsl_secblk_handle_error(ret);
goto exit;
}
/* Compare hash obtained above with SRK hash present in SFP */
if (hash_cmd)
ret = memcmp(&hash, &img->img_key_hash, SHA256_BYTES);
else
ret = memcmp(srk_hash, img->img_key_hash, SHA256_BYTES);
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
if (!hash_cmd && check_ie(img))
ret = 0;
#endif
if (ret != 0) {
fsl_secboot_handle_error(ERROR_ESBC_CLIENT_HASH_COMPARE_KEY);
goto exit;
}
ret = calculate_cmp_img_sig(img);
if (ret) {
fsl_secboot_handle_error(ret);
goto exit;
}
exit:
/* Free Img as it was malloc'ed*/
free(img);
return ret;
}
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