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lib/crypto: Adapt PKCS7 parser to MbedTLS

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Previous patch has introduced MbedTLS porting layer for PKCS7 parser,
here to adjust the header and makefiles accordingly.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
This commit is contained in:
Raymond Mao
2024-10-03 14:50:33 -07:00
committed by Tom Rini
parent 7de0d155cc
commit c47bbf9a57
2 changed files with 60 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
include/crypto/pkcs7_parser.h
View File

@@ -11,6 +11,12 @@
#include <linux/oid_registry.h>
#include <crypto/pkcs7.h>
#include <crypto/x509_parser.h>
#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
#include <mbedtls/pkcs7.h>
#include <library/x509_internal.h>
#include <mbedtls/asn1.h>
#include <mbedtls/oid.h>
#endif
#include <linux/printk.h>
#define kenter(FMT, ...) \
@@ -18,7 +24,54 @@
#define kleave(FMT, ...) \
pr_devel("<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
/* Backup the parsed MedTLS context that we need */
#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
struct pkcs7_mbedtls_ctx {
void *content_data;
};
struct pkcs7_sinfo_mbedtls_ctx {
void *authattrs_data;
void *content_data_digest;
};
#endif
/*
* MbedTLS integration Notes:
*
* MbedTLS PKCS#7 library does not originally support parsing MicroSoft
* Authentication Code which is used for verifying the PE image digest.
*
* 1. Authenticated Attributes (authenticatedAttributes)
* MbedTLS assumes unauthenticatedAttributes and authenticatedAttributes
* fields not exist.
* See MbedTLS function 'pkcs7_get_signer_info' for details.
*
* 2. MicroSoft Authentication Code (mscode)
* MbedTLS only supports Content Data type defined as 1.2.840.113549.1.7.1
* (MBEDTLS_OID_PKCS7_DATA, aka OID_data).
* 1.3.6.1.4.1.311.2.1.4 (MicroSoft Authentication Code, aka
* OID_msIndirectData) is not supported.
* See MbedTLS function 'pkcs7_get_content_info_type' for details.
*
* But the EFI loader assumes that a PKCS#7 message with an EFI image always
* contains MicroSoft Authentication Code as Content Data (msg->data is NOT
* NULL), see function 'efi_signature_verify'.
*
* MbedTLS patch "0002-support-MicroSoft-authentication-code-in-PKCS7-lib.patch"
* is to support both above features by parsing the Content Data and
* Authenticate Attributes from a given PKCS#7 message.
*
* Other fields we don't need to populate from MbedTLS, which are used
* internally by pkcs7_verify:
* 'signer', 'unsupported_crypto', 'blacklisted'
* 'sig->digest' is used internally by pkcs7_digest to calculate the hash of
* Content Data or Authenticate Attributes.
*/
struct pkcs7_signed_info {
#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
struct pkcs7_sinfo_mbedtls_ctx *mbedtls_ctx;
#endif
struct pkcs7_signed_info *next;
struct x509_certificate *signer; /* Signing certificate (in msg->certs) */
unsigned index;
@@ -55,6 +108,9 @@ struct pkcs7_signed_info {
};
struct pkcs7_message {
#if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509)
struct pkcs7_mbedtls_ctx *mbedtls_ctx;
#endif
struct x509_certificate *certs; /* Certificate list */
struct x509_certificate *crl; /* Revocation list */
struct pkcs7_signed_info *signed_infos;

7
lib/crypto/Makefile
View File

@@ -50,15 +50,16 @@ $(obj)/x509_akid.asn1.o: $(obj)/x509_akid.asn1.c $(obj)/x509_akid.asn1.h
# PKCS#7 message handling
#
obj-$(CONFIG_$(SPL_)PKCS7_MESSAGE_PARSER) += pkcs7_message.o
pkcs7_message-y := \
pkcs7_message-y := pkcs7_helper.o
pkcs7_message-$(CONFIG_$(SPL_)PKCS7_MESSAGE_PARSER_LEGACY) += \
pkcs7.asn1.o \
pkcs7_helper.o \
pkcs7_parser.o
obj-$(CONFIG_$(SPL_)PKCS7_VERIFY) += pkcs7_verify.o
$(obj)/pkcs7_parser.o: $(obj)/pkcs7.asn1.h
$(obj)/pkcs7.asn1.o: $(obj)/pkcs7.asn1.c $(obj)/pkcs7.asn1.h
obj-$(CONFIG_$(SPL_)PKCS7_VERIFY) += pkcs7_verify.o
#
# Signed PE binary-wrapped key handling
#