mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-31 03:58:17 +00:00
65a7b48d5a
Add porting layer for MSCode on top of MbedTLS ASN1 library. Introduce _MBEDTLS kconfigs for MSCode MbedTLS implementation. Signed-off-by: Raymond Mao <raymond.mao@linaro.org> Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* MSCode parser using MbedTLS ASN1 library
|
|
*
|
|
* Copyright (c) 2024 Linaro Limited
|
|
* Author: Raymond Mao <raymond.mao@linaro.org>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/err.h>
|
|
#include <crypto/pkcs7.h>
|
|
#include <crypto/mscode.h>
|
|
|
|
/*
|
|
* Parse a Microsoft Individual Code Signing blob
|
|
*
|
|
* U.P.SEQUENCE {
|
|
* U.P.OBJECTIDENTIFIER 1.3.6.1.4.1.311.2.1.15 (SPC_PE_IMAGE_DATA_OBJID)
|
|
* U.P.SEQUENCE {
|
|
* U.P.BITSTRING NaN : 0 unused bit(s);
|
|
* [C.P.0] {
|
|
* [C.P.2] {
|
|
* [C.P.0] <arbitrary string>
|
|
* }
|
|
* }
|
|
* }
|
|
* }
|
|
* U.P.SEQUENCE {
|
|
* U.P.SEQUENCE {
|
|
* U.P.OBJECTIDENTIFIER <digest algorithm OID>
|
|
* U.P.NULL
|
|
* }
|
|
* U.P.OCTETSTRING <PE image digest>
|
|
* }
|
|
*
|
|
* @ctx: PE file context.
|
|
* @content_data: content data pointer.
|
|
* @data_len: content data length.
|
|
* @asn1hdrlen: ASN1 header length.
|
|
*/
|
|
int mscode_parse(void *ctx, const void *content_data, size_t data_len,
|
|
size_t asn1hdrlen)
|
|
{
|
|
struct pefile_context *_ctx = ctx;
|
|
unsigned char *p = (unsigned char *)content_data;
|
|
unsigned char *end = (unsigned char *)content_data + data_len;
|
|
size_t len = 0;
|
|
int ret;
|
|
unsigned char *inner_p;
|
|
size_t seq_len = 0;
|
|
|
|
ret = mbedtls_asn1_get_tag(&p, end, &seq_len,
|
|
MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE);
|
|
if (ret)
|
|
return ret;
|
|
|
|
inner_p = p;
|
|
ret = mbedtls_asn1_get_tag(&inner_p, inner_p + seq_len, &len,
|
|
MBEDTLS_ASN1_OID);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Sanity check on the PE Image Data OID (1.3.6.1.4.1.311.2.1.15) */
|
|
if (MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_MICROSOFT_PEIMAGEDATA, inner_p,
|
|
len))
|
|
return -EINVAL;
|
|
|
|
p += seq_len;
|
|
ret = mbedtls_asn1_get_tag(&p, end, &seq_len,
|
|
MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = mbedtls_asn1_get_tag(&p, p + seq_len, &seq_len,
|
|
MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE);
|
|
if (ret)
|
|
return ret;
|
|
|
|
inner_p = p;
|
|
|
|
/*
|
|
* Check if the inner sequence contains a supported hash
|
|
* algorithm OID
|
|
*/
|
|
ret = mbedtls_asn1_get_tag(&inner_p, inner_p + seq_len, &len,
|
|
MBEDTLS_ASN1_OID);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_MD5, inner_p, len))
|
|
_ctx->digest_algo = "md5";
|
|
else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA1, inner_p,
|
|
len))
|
|
_ctx->digest_algo = "sha1";
|
|
else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA224, inner_p,
|
|
len))
|
|
_ctx->digest_algo = "sha224";
|
|
else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA256, inner_p,
|
|
len))
|
|
_ctx->digest_algo = "sha256";
|
|
else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA384, inner_p,
|
|
len))
|
|
_ctx->digest_algo = "sha384";
|
|
else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA512, inner_p,
|
|
len))
|
|
_ctx->digest_algo = "sha512";
|
|
|
|
if (!_ctx->digest_algo)
|
|
return -EINVAL;
|
|
|
|
p += seq_len;
|
|
ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING);
|
|
if (ret)
|
|
return ret;
|
|
|
|
_ctx->digest = p;
|
|
_ctx->digest_len = len;
|
|
|
|
return 0;
|
|
}
|