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SECURE BOOT: separate functions for reading keys

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Separate functions are created for reading and checking the
sanity of Public keys:
- read_validate_single_key
- read_validate_ie_tbl
- read_validate_srk_table

Signed-off-by: Saksham Jain <saksham@freescale.com>
Signed-off-by: Aneesh Bansal <aneesh.bansal@freescale.com>
Acked-by: Ruchika Gupta <ruchika.gupta@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Aneesh Bansal 2015-12-08 14:14:13 +05:30 committed by York Sun
parent bc71f926e3
commit 94ba5e4140
1 changed files with 96 additions and 73 deletions
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169
board/freescale/common/fsl_validate.c
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@ -24,6 +24,10 @@
#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))
/* 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,
@ -179,20 +183,97 @@ static u32 is_key_revoked(u32 keynum, u32 rev_flag)
return 0;
}
/* It validates srk_table key lengths.*/
static u32 validate_srk_tbl(struct srk_table *tbl, u32 num_entries)
/* It read validates srk_table key lengths.*/
static u32 read_validate_srk_tbl(struct fsl_secboot_img_priv *img)
{
int i = 0;
for (i = 0; i < num_entries; i++) {
if (!((tbl[i].key_len == 2 * KEY_SIZE_BYTES/4) ||
(tbl[i].key_len == 2 * KEY_SIZE_BYTES/2) ||
(tbl[i].key_len == 2 * KEY_SIZE_BYTES)))
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
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;
}
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
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 (get_ie_info_addr(&img->ie_addr))
return ERROR_IE_TABLE_NOT_FOUND;
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)
{
@ -541,13 +622,9 @@ 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;
#ifdef CONFIG_KEY_REVOCATION
u32 ret;
u32 key_num, key_revoc_flag, size;
#endif
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
struct ie_key_info *ie_info;
u32 ie_num, ie_revoc_flag, ie_key_len;
#endif
int key_found = 0;
@ -568,80 +645,26 @@ static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
/* Key checking*/
#ifdef CONFIG_KEY_REVOCATION
if (check_srk(img)) {
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);
ret = validate_srk_tbl(img->srk_tbl, hdr->len_kr.num_srk);
ret = read_validate_srk_tbl(img);
if (ret != 0)
return ret;
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);
key_found = 1;
}
#endif
#if defined(CONFIG_FSL_ISBC_KEY_EXT)
if (!key_found && check_ie(img)) {
if (get_ie_info_addr(&img->ie_addr))
return ERROR_IE_TABLE_NOT_FOUND;
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 (!((ie_key_len == 2 * KEY_SIZE_BYTES / 4) ||
(ie_key_len == 2 * KEY_SIZE_BYTES / 2) ||
(ie_key_len == 2 * KEY_SIZE_BYTES)))
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;
ret = read_validate_ie_tbl(img);
if (ret != 0)
return ret;
key_found = 1;
}
#endif
if (key_found == 0) {
/* check key length */
if (!((hdr->key_len == 2 * KEY_SIZE_BYTES / 4) ||
(hdr->key_len == 2 * KEY_SIZE_BYTES / 2) ||
(hdr->key_len == 2 * KEY_SIZE_BYTES)))
return ERROR_ESBC_CLIENT_HEADER_KEY_LEN;
memcpy(&img->img_key, esbc + hdr->pkey, hdr->key_len);
img->key_len = hdr->key_len;
ret = read_validate_single_key(img);
if (ret != 0)
return ret;
key_found = 1;
}