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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+
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/*
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* MSCode parser using MbedTLS ASN1 library
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*
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* Copyright (c) 2024 Linaro Limited
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* Author: Raymond Mao <raymond.mao@linaro.org>
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <crypto/pkcs7.h>
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#include <crypto/mscode.h>
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/*
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* Parse a Microsoft Individual Code Signing blob
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*
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* U.P.SEQUENCE {
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* U.P.OBJECTIDENTIFIER 1.3.6.1.4.1.311.2.1.15 (SPC_PE_IMAGE_DATA_OBJID)
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* U.P.SEQUENCE {
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* U.P.BITSTRING NaN : 0 unused bit(s);
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* [C.P.0] {
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* [C.P.2] {
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* [C.P.0] <arbitrary string>
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* }
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* }
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* }
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* }
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* U.P.SEQUENCE {
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* U.P.SEQUENCE {
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* U.P.OBJECTIDENTIFIER <digest algorithm OID>
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* U.P.NULL
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* }
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* U.P.OCTETSTRING <PE image digest>
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* }
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*
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* @ctx: PE file context.
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* @content_data: content data pointer.
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* @data_len: content data length.
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* @asn1hdrlen: ASN1 header length.
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*/
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int mscode_parse(void *ctx, const void *content_data, size_t data_len,
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size_t asn1hdrlen)
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{
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struct pefile_context *_ctx = ctx;
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unsigned char *p = (unsigned char *)content_data;
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unsigned char *end = (unsigned char *)content_data + data_len;
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size_t len = 0;
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int ret;
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unsigned char *inner_p;
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size_t seq_len = 0;
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ret = mbedtls_asn1_get_tag(&p, end, &seq_len,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE);
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if (ret)
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return ret;
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inner_p = p;
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ret = mbedtls_asn1_get_tag(&inner_p, inner_p + seq_len, &len,
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MBEDTLS_ASN1_OID);
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if (ret)
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return ret;
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/* Sanity check on the PE Image Data OID (1.3.6.1.4.1.311.2.1.15) */
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if (MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_MICROSOFT_PEIMAGEDATA, inner_p,
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len))
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return -EINVAL;
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p += seq_len;
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ret = mbedtls_asn1_get_tag(&p, end, &seq_len,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE);
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if (ret)
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return ret;
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ret = mbedtls_asn1_get_tag(&p, p + seq_len, &seq_len,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE);
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if (ret)
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return ret;
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inner_p = p;
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/*
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* Check if the inner sequence contains a supported hash
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* algorithm OID
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*/
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ret = mbedtls_asn1_get_tag(&inner_p, inner_p + seq_len, &len,
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MBEDTLS_ASN1_OID);
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if (ret)
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return ret;
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if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_MD5, inner_p, len))
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_ctx->digest_algo = "md5";
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else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA1, inner_p,
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len))
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_ctx->digest_algo = "sha1";
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else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA224, inner_p,
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len))
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_ctx->digest_algo = "sha224";
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else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA256, inner_p,
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len))
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_ctx->digest_algo = "sha256";
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else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA384, inner_p,
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len))
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_ctx->digest_algo = "sha384";
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else if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_DIGEST_ALG_SHA512, inner_p,
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len))
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_ctx->digest_algo = "sha512";
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if (!_ctx->digest_algo)
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return -EINVAL;
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p += seq_len;
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ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING);
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if (ret)
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return ret;
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_ctx->digest = p;
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_ctx->digest_len = len;
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return 0;
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}
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