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shim-unsigned-x64/SOURCES/0056-Make-cert.S-not-imposs...

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From 7d542805ba5c48185128a2351bb315a5648fe3d7 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Thu, 23 Jul 2020 00:08:30 -0400
Subject: [PATCH 56/62] Make cert.S not impossible to read.
Signed-off-by: Peter Jones <pjones@redhat.com>
Upstream: pr#206
---
shim.c | 47 +++++++++++++++++--------------
shim.h | 28 +++++++++++++++---
cert.S | 89 ++++++++++++++++++++++------------------------------------
3 files changed, 84 insertions(+), 80 deletions(-)
diff --git a/shim.c b/shim.c
index 0e7e784b4c8..888ee6e8d7b 100644
--- a/shim.c
+++ b/shim.c
@@ -68,16 +68,18 @@ static UINT32 load_options_size;
* The vendor certificate used for validating the second stage loader
*/
extern struct {
- UINT32 vendor_cert_size;
- UINT32 vendor_dbx_size;
- UINT32 vendor_cert_offset;
- UINT32 vendor_dbx_offset;
+ UINT32 vendor_authorized_size;
+ UINT32 vendor_deauthorized_size;
+ UINT32 vendor_authorized_offset;
+ UINT32 vendor_deauthorized_offset;
} cert_table;
-UINT32 vendor_cert_size;
-UINT32 vendor_dbx_size;
-UINT8 *vendor_cert;
-UINT8 *vendor_dbx;
+UINT32 vendor_authorized_size = 0;
+UINT8 *vendor_authorized = NULL;
+
+UINT32 vendor_deauthorized_size = 0;
+UINT8 *vendor_deauthorized = NULL;
+
#if defined(ENABLE_SHIM_CERT)
UINT32 build_cert_size;
UINT8 *build_cert;
@@ -554,22 +556,22 @@ static CHECK_STATUS check_db_hash(CHAR16 *dbname, EFI_GUID guid, UINT8 *data,
static EFI_STATUS check_blacklist (WIN_CERTIFICATE_EFI_PKCS *cert,
UINT8 *sha256hash, UINT8 *sha1hash)
{
- EFI_SIGNATURE_LIST *dbx = (EFI_SIGNATURE_LIST *)vendor_dbx;
+ EFI_SIGNATURE_LIST *dbx = (EFI_SIGNATURE_LIST *)vendor_deauthorized;
- if (check_db_hash_in_ram(dbx, vendor_dbx_size, sha256hash,
+ if (check_db_hash_in_ram(dbx, vendor_deauthorized_size, sha256hash,
SHA256_DIGEST_SIZE, EFI_CERT_SHA256_GUID, L"dbx",
EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) {
LogError(L"binary sha256hash found in vendor dbx\n");
return EFI_SECURITY_VIOLATION;
}
- if (check_db_hash_in_ram(dbx, vendor_dbx_size, sha1hash,
+ if (check_db_hash_in_ram(dbx, vendor_deauthorized_size, sha1hash,
SHA1_DIGEST_SIZE, EFI_CERT_SHA1_GUID, L"dbx",
EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) {
LogError(L"binary sha1hash found in vendor dbx\n");
return EFI_SECURITY_VIOLATION;
}
if (cert &&
- check_db_cert_in_ram(dbx, vendor_dbx_size, cert, sha256hash, L"dbx",
+ check_db_cert_in_ram(dbx, vendor_deauthorized_size, cert, sha256hash, L"dbx",
EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) {
LogError(L"cert sha256hash found in vendor dbx\n");
return EFI_SECURITY_VIOLATION;
@@ -1077,19 +1079,19 @@ static EFI_STATUS verify_buffer (char *data, int datasize,
/*
* And finally, check against shim's built-in key
*/
- if (vendor_cert_size &&
+ if (vendor_authorized_size &&
AuthenticodeVerify(cert->CertData,
cert->Hdr.dwLength - sizeof(cert->Hdr),
- vendor_cert, vendor_cert_size,
+ vendor_authorized, vendor_authorized_size,
sha256hash, SHA256_DIGEST_SIZE)) {
update_verification_method(VERIFIED_BY_CERT);
tpm_measure_variable(L"Shim", SHIM_LOCK_GUID,
- vendor_cert_size, vendor_cert);
+ vendor_authorized_size, vendor_authorized);
efi_status = EFI_SUCCESS;
drain_openssl_errors();
return efi_status;
} else {
- LogError(L"AuthenticodeVerify(vendor_cert) failed\n");
+ LogError(L"AuthenticodeVerify(vendor_authorized) failed\n");
}
}
@@ -2501,7 +2503,7 @@ shim_init(void)
}
if (secure_mode()) {
- if (vendor_cert_size || vendor_dbx_size) {
+ if (vendor_authorized_size || vendor_deauthorized_size) {
/*
* If shim includes its own certificates then ensure
* that anything it boots has performed some
@@ -2606,14 +2608,17 @@ efi_main (EFI_HANDLE passed_image_handle, EFI_SYSTEM_TABLE *passed_systab)
verification_method = VERIFIED_BY_NOTHING;
- vendor_cert_size = cert_table.vendor_cert_size;
- vendor_dbx_size = cert_table.vendor_dbx_size;
- vendor_cert = (UINT8 *)&cert_table + cert_table.vendor_cert_offset;
- vendor_dbx = (UINT8 *)&cert_table + cert_table.vendor_dbx_offset;
+ vendor_authorized_size = cert_table.vendor_authorized_size;
+ vendor_authorized = (UINT8 *)&cert_table + cert_table.vendor_authorized_offset;
+
+ vendor_deauthorized_size = cert_table.vendor_deauthorized_size;
+ vendor_deauthorized = (UINT8 *)&cert_table + cert_table.vendor_deauthorized_offset;
+
#if defined(ENABLE_SHIM_CERT)
build_cert_size = sizeof(shim_cert);
build_cert = shim_cert;
#endif /* defined(ENABLE_SHIM_CERT) */
+
CHAR16 *msgs[] = {
L"import_mok_state() failed",
L"shim_init() failed",
diff --git a/shim.h b/shim.h
index a0fa5a75e7e..555498c6673 100644
--- a/shim.h
+++ b/shim.h
@@ -97,6 +97,24 @@
#define FALLBACK L"\\fb" EFI_ARCH L".efi"
#define MOK_MANAGER L"\\mm" EFI_ARCH L".efi"
+#if defined(VENDOR_CERT_FILE)
+# define vendor_authorized vendor_cert
+# define vendor_authorized_size vendor_cert_size
+# define vendor_authorized_category VENDOR_ADDEND_X509
+#else
+# define vendor_authorized vendor_null
+# define vendor_authorized_size vendor_null_size
+# define vendor_authorized_category VENDOR_ADDEND_NONE
+#endif
+
+#if defined(VENDOR_DBX_FILE)
+# define vendor_deauthorized vendor_dbx
+# define vendor_deauthorized_size vendor_dbx_size
+#else
+# define vendor_deauthorized vendor_deauthorized_null
+# define vendor_deauthorized_size vendor_deauthorized_null_size
+#endif
+
#include "include/asm.h"
#include "include/configtable.h"
#include "include/console.h"
@@ -166,10 +184,12 @@ extern VOID ClearErrors(VOID);
extern EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath);
extern EFI_STATUS import_mok_state(EFI_HANDLE image_handle);
-extern UINT32 vendor_cert_size;
-extern UINT32 vendor_dbx_size;
-extern UINT8 *vendor_cert;
-extern UINT8 *vendor_dbx;
+extern UINT32 vendor_authorized_size;
+extern UINT8 *vendor_authorized;
+
+extern UINT32 vendor_deauthorized_size;
+extern UINT8 *vendor_deauthorized;
+
#if defined(ENABLE_SHIM_CERT)
extern UINT32 build_cert_size;
extern UINT8 *build_cert;
diff --git a/cert.S b/cert.S
index cfc4525b44c..520caaef3af 100644
--- a/cert.S
+++ b/cert.S
@@ -1,65 +1,44 @@
+
+#if defined(VENDOR_CERT_FILE)
+# define vendor_authorized vendor_cert
+# define vendor_authorized_end vendor_cert_end
+# define vendor_authorized_size vendor_cert_size
+# define vendor_authorized_size_end vendor_cert_size_end
+#endif
+
+#if defined(VENDOR_DBX_FILE)
+# define vendor_deauthorized vendor_dbx
+# define vendor_deauthorized_end vendor_dbx_end
+# define vendor_deauthorized_size vendor_dbx_size
+# define vendor_deauthorized_size_end vendor_dbx_size_end
+#endif
+
.globl cert_table
.type cert_table, %object
- .size cert_table, 4
+ .size cert_table, .Lcert_table_end - cert_table
.section .vendor_cert, "a", %progbits
+ .balignl 4, 0
cert_table:
-#if defined(VENDOR_CERT_FILE)
- .long vendor_cert_priv_end - vendor_cert_priv
-#else
- .long 0
-#endif
-#if defined(VENDOR_DBX_FILE)
- .long vendor_dbx_priv_end - vendor_dbx_priv
-#else
- .long 0
-#endif
- .long vendor_cert_priv - cert_table
- .long vendor_dbx_priv - cert_table
-#if defined(VENDOR_CERT_FILE)
- .data
- .align 1
- .type vendor_cert_priv, %object
- .size vendor_cert_priv, vendor_cert_priv_end-vendor_cert_priv
+ .4byte .Lvendor_authorized_end - vendor_authorized
+ .4byte .Lvendor_deauthorized_end - vendor_deauthorized
+ .4byte vendor_authorized - cert_table
+ .4byte vendor_deauthorized - cert_table
+ .balign 1, 0
+ .type vendor_authorized, %object
+ .size vendor_authorized, .Lvendor_authorized_end - vendor_authorized
.section .vendor_cert, "a", %progbits
-vendor_cert_priv:
+vendor_authorized:
+#if defined(VENDOR_CERT_FILE)
.incbin VENDOR_CERT_FILE
-vendor_cert_priv_end:
-#else
- .bss
- .type vendor_cert_priv, %object
- .size vendor_cert_priv, 1
- .section .vendor_cert, "a", %progbits
-vendor_cert_priv:
- .zero 1
-
- .data
- .align 4
- .type vendor_cert_size_priv, %object
- .size vendor_cert_size_priv, 4
- .section .vendor_cert, "a", %progbits
-vendor_cert_priv_end:
#endif
+.Lvendor_authorized_end:
+ .balign 1, 0
+ .type vendor_deauthorized, %object
+ .size vendor_deauthorized, .Lvendor_deauthorized_end - vendor_deauthorized
+ .section .vendor_cert, "a", %progbits
+vendor_deauthorized:
#if defined(VENDOR_DBX_FILE)
- .data
- .align 1
- .type vendor_dbx_priv, %object
- .size vendor_dbx_priv, vendor_dbx_priv_end-vendor_dbx_priv
- .section .vendor_cert, "a", %progbits
-vendor_dbx_priv:
.incbin VENDOR_DBX_FILE
-vendor_dbx_priv_end:
-#else
- .bss
- .type vendor_dbx_priv, %object
- .size vendor_dbx_priv, 1
- .section .vendor_cert, "a", %progbits
-vendor_dbx_priv:
- .zero 1
-
- .data
- .align 4
- .type vendor_dbx_size_priv, %object
- .size vendor_dbx_size_priv, 4
- .section .vendor_cert, "a", %progbits
-vendor_dbx_priv_end:
#endif
+.Lvendor_deauthorized_end:
+.Lcert_table_end:
--
2.26.2
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