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efi_loader: add signature verification functions

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In this commit, implemented are a couple of helper functions which will be
used to materialize variable authentication as well as image authentication
in later patches.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
This commit is contained in:
AKASHI Takahiro
2020-04-14 11:51:39 +09:00
committed by Heinrich Schuchardt
parent 9bf09b5120
commit 593e17d673
4 changed files with 738 additions and 0 deletions
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72
include/efi_loader.h
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@@ -26,6 +26,7 @@ static inline void *guidcpy(void *dst, const void *src)
#if CONFIG_IS_ENABLED(EFI_LOADER)
#include <linux/list.h>
#include <linux/oid_registry.h>
/* Maximum number of configuration tables */
#define EFI_MAX_CONFIGURATION_TABLES 16
@@ -178,6 +179,11 @@ extern const efi_guid_t efi_guid_hii_config_routing_protocol;
extern const efi_guid_t efi_guid_hii_config_access_protocol;
extern const efi_guid_t efi_guid_hii_database_protocol;
extern const efi_guid_t efi_guid_hii_string_protocol;
/* GUIDs for authentication */
extern const efi_guid_t efi_guid_image_security_database;
extern const efi_guid_t efi_guid_sha256;
extern const efi_guid_t efi_guid_cert_x509;
extern const efi_guid_t efi_guid_cert_x509_sha256;
/* GUID of RNG protocol */
extern const efi_guid_t efi_guid_rng_protocol;
@@ -680,6 +686,72 @@ void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data);
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
efi_status_t efi_bootmgr_load(efi_handle_t *handle);
#ifdef CONFIG_EFI_SECURE_BOOT
#include <image.h>
/**
* efi_image_regions - A list of memory regions
*
* @max: Maximum number of regions
* @num: Number of regions
* @reg: array of regions
*/
struct efi_image_regions {
int max;
int num;
struct image_region reg[];
};
/**
* efi_sig_data - A decoded data of struct efi_signature_data
*
* This structure represents an internal form of signature in
* signature database. A listed list may represent a signature list.
*
* @next: Pointer to next entry
* @onwer: Signature owner
* @data: Pointer to signature data
* @size: Size of signature data
*/
struct efi_sig_data {
struct efi_sig_data *next;
efi_guid_t owner;
void *data;
size_t size;
};
/**
* efi_signature_store - A decoded data of signature database
*
* This structure represents an internal form of signature database.
*
* @next: Pointer to next entry
* @sig_type: Signature type
* @sig_data_list: Pointer to signature list
*/
struct efi_signature_store {
struct efi_signature_store *next;
efi_guid_t sig_type;
struct efi_sig_data *sig_data_list;
};
struct x509_certificate;
struct pkcs7_message;
bool efi_signature_verify_cert(struct x509_certificate *cert,
struct efi_signature_store *dbx);
bool efi_signature_verify_signers(struct pkcs7_message *msg,
struct efi_signature_store *dbx);
bool efi_signature_verify_with_sigdb(struct efi_image_regions *regs,
struct pkcs7_message *msg,
struct efi_signature_store *db,
struct x509_certificate **cert);
efi_status_t efi_image_region_add(struct efi_image_regions *regs,
const void *start, const void *end,
int nocheck);
#endif /* CONFIG_EFI_SECURE_BOOT */
#else /* CONFIG_IS_ENABLED(EFI_LOADER) */
/* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */