File shim-bsc1198101-opensuse-cert-prompt.patch of Package shim.28618
From 49355a83722494099caeb23b46637b2c94a6ab9e Mon Sep 17 00:00:00 2001
From: Gary Ching-Pang Lin <glin@suse.com>
Date: Tue, 18 Feb 2014 17:29:19 +0800
Subject: [PATCH 1/3] Show the build-in certificate prompt
This is an openSUSE-only patch.
Pop up a window to ask if the user is willing to trust the built-in
openSUSE certificate.
If yes, set openSUSE_Verify, a BootService variable, to 1, and shim
won't bother the user afterward.
If no, continue the booting process without using the built-in
certificate to verify the EFI images, and the window will show up
again after reboot.
The state will store in use_openSUSE_cert, a volatile RT variable.
---
mok.c | 3 ++-
shim.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
shim.h | 1 +
3 files changed, 71 insertions(+), 2 deletions(-)
Index: shim-15.6/mok.c
===================================================================
--- shim-15.6.orig/mok.c
+++ shim-15.6/mok.c
@@ -46,7 +46,8 @@ static EFI_STATUS check_mok_request(EFI_
check_var(L"MokPW") || check_var(L"MokAuth") ||
check_var(L"MokDel") || check_var(L"MokDB") ||
check_var(L"MokXNew") || check_var(L"MokXDel") ||
- check_var(L"MokXAuth") || check_var(L"MokListTrustedNew")) {
+ check_var(L"MokXAuth") || check_var(L"MokListTrustedNew") ||
+ check_var(L"ClearVerify")) {
efi_status = start_image(image_handle, MOK_MANAGER);
if (EFI_ERROR(efi_status)) {
@@ -62,7 +63,8 @@ static vendor_addend_category_t
categorize_authorized(struct mok_state_variable *v)
{
if (!(v->addend && v->addend_size &&
- *v->addend && *v->addend_size)) {
+ *v->addend && *v->addend_size &&
+ use_builtin_cert)) {
return VENDOR_ADDEND_NONE;
}
Index: shim-15.6/shim.c
===================================================================
--- shim-15.6.orig/shim.c
+++ shim-15.6/shim.c
@@ -496,6 +496,8 @@ verify_one_signature(WIN_CERTIFICATE_EFI
}
efi_status = EFI_NOT_FOUND;
+ if (!use_builtin_cert)
+ return efi_status;
#if defined(ENABLE_SHIM_CERT)
/*
* Check against the shim build key
@@ -1568,6 +1570,69 @@ shim_fini(void)
console_fini();
}
+#define VENDOR_VERIFY L"openSUSE_Verify"
+
+/* Show the built-in certificate prompt if necessary */
+static int builtin_cert_prompt(void)
+{
+ EFI_STATUS status;
+ UINT32 attributes;
+ UINTN len = sizeof(UINT8);
+ UINT8 data;
+
+ use_builtin_cert = FALSE;
+
+ if (vendor_cert_size == 0)
+ return 0;
+
+ status = gRT->GetVariable(VENDOR_VERIFY, &SHIM_LOCK_GUID,
+ &attributes, &len, (void *)&data);
+ if (status != EFI_SUCCESS ||
+ (attributes & EFI_VARIABLE_RUNTIME_ACCESS)) {
+ int choice;
+
+ if (status != EFI_NOT_FOUND)
+ LibDeleteVariable(VENDOR_VERIFY, &SHIM_LOCK_GUID);
+
+ CHAR16 *str[] = {L"Trust openSUSE Certificate",
+ L"",
+ L"Do you agree to use the built-in openSUSE certificate",
+ L"to verify boot loaders and kernels?",
+ NULL};
+ choice = console_yes_no(str);
+ if (choice != 1) {
+ data = 0;
+ goto done;
+ }
+
+ data = 1;
+ status = gRT->SetVariable(VENDOR_VERIFY, &SHIM_LOCK_GUID,
+ EFI_VARIABLE_NON_VOLATILE |
+ EFI_VARIABLE_BOOTSERVICE_ACCESS,
+ sizeof(UINT8), &data);
+ if (status != EFI_SUCCESS) {
+ console_error(L"Failed to set openSUSE_Verify", status);
+ return -1;
+ }
+ }
+
+ use_builtin_cert = TRUE;
+ data = 1;
+
+done:
+ /* Setup a runtime variable to show the current state */
+ status = gRT->SetVariable(L"use_openSUSE_cert", &SHIM_LOCK_GUID,
+ EFI_VARIABLE_BOOTSERVICE_ACCESS |
+ EFI_VARIABLE_RUNTIME_ACCESS,
+ sizeof(UINT8), &data);
+ if (status != EFI_SUCCESS) {
+ console_error(L"Failed to set use_openSUSE_cert", status);
+ return -1;
+ }
+
+ return 0;
+}
+
extern EFI_STATUS
efi_main(EFI_HANDLE passed_image_handle, EFI_SYSTEM_TABLE *passed_systab);
@@ -1708,6 +1773,9 @@ efi_main (EFI_HANDLE passed_image_handle
*/
debug_hook();
+ if (secure_mode() && (builtin_cert_prompt() != 0))
+ return EFI_ABORTED;
+
efi_status = set_sbat_uefi_variable();
if (EFI_ERROR(efi_status) && secure_mode()) {
perror(L"%s variable initialization failed\n", SBAT_VAR_NAME);
Index: shim-15.6/MokManager.c
===================================================================
--- shim-15.6.orig/MokManager.c
+++ shim-15.6/MokManager.c
@@ -1864,6 +1864,36 @@ mokpw_done:
return EFI_SUCCESS;
}
+static INTN mok_clear_verify_prompt(void *ClearVerify, UINTN ClearVerifySize) {
+ EFI_STATUS status;
+
+ if (console_yes_no((CHAR16 *[]){L"Do you want to revoke openSUSE certificate?", NULL}) != 1)
+ return 0;
+
+ if (ClearVerifySize == PASSWORD_CRYPT_SIZE) {
+ status = match_password((PASSWORD_CRYPT *)ClearVerify, NULL, 0,
+ NULL, NULL);
+ } else {
+ status = EFI_INVALID_PARAMETER;
+ }
+ if (status != EFI_SUCCESS)
+ return -1;
+
+ status = gRT->SetVariable(L"openSUSE_Verify", &SHIM_LOCK_GUID,
+ EFI_VARIABLE_BOOTSERVICE_ACCESS |
+ EFI_VARIABLE_NON_VOLATILE,
+ 0, NULL);
+ if (status != EFI_SUCCESS) {
+ console_error(L"Failed to delete openSUSE_Verify", status);
+ return -1;
+ }
+
+ console_notify(L"The system must now be rebooted");
+ gRT->ResetSystem(EfiResetWarm, EFI_SUCCESS, 0, NULL);
+ console_notify(L"Failed to reboot");
+ return -1;
+}
+
static BOOLEAN verify_certificate(UINT8 * cert, UINTN size)
{
X509 *X509Cert;
@@ -2195,6 +2225,7 @@ typedef enum {
MOK_CHANGE_SB,
MOK_SET_PW,
MOK_CHANGE_DB,
+ MOK_CLEAR_VERIFY,
MOK_KEY_ENROLL,
MOK_HASH_ENROLL,
MOK_CHANGE_TML
@@ -2217,7 +2248,9 @@ static EFI_STATUS enter_mok_menu(EFI_HAN
void *MokDB, UINTN MokDBSize,
void *MokXNew, UINTN MokXNewSize,
void *MokXDel, UINTN MokXDelSize,
- void *MokTML, UINTN MokTMLSize)
+ void *MokTML, UINTN MokTMLSize,
+ void *ClearVerify, UINTN ClearVerifySize)
+
{
CHAR16 **menu_strings = NULL;
mok_menu_item *menu_item = NULL;
@@ -2296,6 +2329,9 @@ static EFI_STATUS enter_mok_menu(EFI_HAN
if (MokTML)
menucount++;
+ if (ClearVerify)
+ menucount++;
+
menu_strings = AllocateZeroPool(sizeof(CHAR16 *) *
(menucount + 1));
if (!menu_strings)
@@ -2373,6 +2409,12 @@ static EFI_STATUS enter_mok_menu(EFI_HAN
i++;
}
+ if (ClearVerify) {
+ menu_strings[i] = L"Revoke openSUSE certificate";
+ menu_item[i] = MOK_CLEAR_VERIFY;
+ i++;
+ }
+
menu_strings[i] = L"Enroll key from disk";
menu_item[i] = MOK_KEY_ENROLL;
i++;
@@ -2477,6 +2519,9 @@ static EFI_STATUS enter_mok_menu(EFI_HAN
if (!EFI_ERROR(efi_status))
MokDB = NULL;
break;
+ case MOK_CLEAR_VERIFY:
+ mok_clear_verify_prompt(ClearVerify, ClearVerifySize);
+ break;
case MOK_KEY_ENROLL:
efi_status = mok_key_enroll();
break;
@@ -2519,6 +2564,7 @@ static EFI_STATUS check_mok_request(EFI_
{
UINTN MokNewSize = 0, MokDelSize = 0, MokSBSize = 0, MokPWSize = 0;
UINTN MokDBSize = 0, MokXNewSize = 0, MokXDelSize = 0, MokTMLSize = 0;
+ UINTN ClearVerifySize = 0;
void *MokNew = NULL;
void *MokDel = NULL;
void *MokSB = NULL;
@@ -2527,6 +2573,7 @@ static EFI_STATUS check_mok_request(EFI_
void *MokXNew = NULL;
void *MokXDel = NULL;
void *MokTML = NULL;
+ void *ClearVerify = NULL;
EFI_STATUS efi_status;
efi_status = get_variable(L"MokNew", (UINT8 **) & MokNew, &MokNewSize,
@@ -2611,9 +2658,20 @@ static EFI_STATUS check_mok_request(EFI_
console_error(L"Could not retrieve MokXDel", efi_status);
}
+ efi_status = get_variable(L"ClearVerify", (UINT8 **)&ClearVerify,
+ &ClearVerifySize, SHIM_LOCK_GUID);
+ if (!EFI_ERROR(efi_status)) {
+ efi_status = LibDeleteVariable(L"ClearVerify", &SHIM_LOCK_GUID);
+ if (EFI_ERROR(efi_status))
+ console_notify(L"Failed to delete ClearVerify");
+ } else if (EFI_ERROR(efi_status) && efi_status != EFI_NOT_FOUND) {
+ console_error(L"Could not retrieve ClearVerify", efi_status);
+ }
+
enter_mok_menu(image_handle, MokNew, MokNewSize, MokDel, MokDelSize,
MokSB, MokSBSize, MokPW, MokPWSize, MokDB, MokDBSize,
- MokXNew, MokXNewSize, MokXDel, MokXDelSize, MokTML, MokTMLSize);
+ MokXNew, MokXNewSize, MokXDel, MokXDelSize, MokTML, MokTMLSize,
+ ClearVerify, ClearVerifySize);
if (MokNew)
FreePool(MokNew);
@@ -2639,6 +2697,9 @@ static EFI_STATUS check_mok_request(EFI_
if (MokTML)
FreePool(MokTML);
+ if (ClearVerify)
+ FreePool (ClearVerify);
+
LibDeleteVariable(L"MokAuth", &SHIM_LOCK_GUID);
LibDeleteVariable(L"MokDelAuth", &SHIM_LOCK_GUID);
LibDeleteVariable(L"MokXAuth", &SHIM_LOCK_GUID);
Index: shim-15.6/globals.c
===================================================================
--- shim-15.6.orig/globals.c
+++ shim-15.6/globals.c
@@ -25,6 +25,7 @@ UINT8 *build_cert;
*/
verification_method_t verification_method;
int loader_is_participating;
+BOOLEAN use_builtin_cert;
UINT8 user_insecure_mode;
UINT8 ignore_db;
Index: shim-15.6/shim.h
===================================================================
--- shim-15.6.orig/shim.h
+++ shim-15.6/shim.h
@@ -270,6 +270,7 @@ extern UINT8 mok_policy;
extern UINT8 in_protocol;
extern void *load_options;
extern UINT32 load_options_size;
+extern BOOLEAN use_builtin_cert;
BOOLEAN secure_mode (void);
