File shim-opensuse-cert-prompt.patch of Package shim
From b13d18d4069032ccf6c885774e9eada6a1d80ddd 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.
---
shim.c | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------
1 file changed, 97 insertions(+), 19 deletions(-)
Index: shim-0.7/shim.c
===================================================================
--- shim-0.7.orig/shim.c
+++ shim-0.7/shim.c
@@ -90,6 +90,7 @@ UINT8 *vendor_dbx;
*/
verification_method_t verification_method;
int loader_is_participating;
+BOOLEAN use_builtin_cert;
#define EFI_IMAGE_SECURITY_DATABASE_GUID { 0xd719b2cb, 0x3d3a, 0x4596, { 0xa3, 0xbc, 0xda, 0xd0, 0x0e, 0x67, 0x65, 0x6f }}
@@ -817,7 +818,7 @@ static EFI_STATUS verify_buffer (char *d
if (status == EFI_SUCCESS)
return status;
- if (cert) {
+ if (cert && use_builtin_cert) {
/*
* Check against the shim build key
*/
@@ -1523,11 +1524,14 @@ EFI_STATUS mirror_mok_list()
if (efi_status != EFI_SUCCESS)
DataSize = 0;
- FullDataSize = DataSize
- + sizeof (*CertList)
- + sizeof (EFI_GUID)
- + vendor_cert_size
- ;
+ FullDataSize = DataSize;
+ if (use_builtin_cert) {
+ FullDataSize += sizeof (*CertList) +
+ sizeof (EFI_GUID) +
+ vendor_cert_size;
+ } else if (DataSize == 0) {
+ return EFI_SUCCESS;
+ }
FullData = AllocatePool(FullDataSize);
if (!FullData) {
perror(L"Failed to allocate space for MokListRT\n");
@@ -1539,21 +1543,24 @@ EFI_STATUS mirror_mok_list()
CopyMem(p, Data, DataSize);
p += DataSize;
}
- CertList = (EFI_SIGNATURE_LIST *)p;
- p += sizeof (*CertList);
- CertData = (EFI_SIGNATURE_DATA *)p;
- p += sizeof (EFI_GUID);
-
- CertList->SignatureType = EFI_CERT_X509_GUID;
- CertList->SignatureListSize = vendor_cert_size
- + sizeof (*CertList)
- + sizeof (*CertData)
- -1;
- CertList->SignatureHeaderSize = 0;
- CertList->SignatureSize = vendor_cert_size + sizeof (EFI_GUID);
- CertData->SignatureOwner = SHIM_LOCK_GUID;
- CopyMem(p, vendor_cert, vendor_cert_size);
+ if (use_builtin_cert) {
+ CertList = (EFI_SIGNATURE_LIST *)p;
+ p += sizeof (*CertList);
+ CertData = (EFI_SIGNATURE_DATA *)p;
+ p += sizeof (EFI_GUID);
+
+ CertList->SignatureType = EFI_CERT_X509_GUID;
+ CertList->SignatureListSize = vendor_cert_size
+ + sizeof (*CertList)
+ + sizeof (*CertData)
+ -1;
+ CertList->SignatureHeaderSize = 0;
+ CertList->SignatureSize = vendor_cert_size + sizeof (EFI_GUID);
+
+ CertData->SignatureOwner = SHIM_LOCK_GUID;
+ CopyMem(p, vendor_cert, vendor_cert_size);
+ }
efi_status = uefi_call_wrapper(RT->SetVariable, 5, L"MokListRT",
&shim_lock_guid,
@@ -1600,7 +1607,7 @@ EFI_STATUS check_mok_request(EFI_HANDLE
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"MokXAuth") || check_var(L"ClearVerify")) {
efi_status = start_image(image_handle, MOK_MANAGER);
if (efi_status != EFI_SUCCESS) {
@@ -1840,6 +1847,75 @@ uninstall_shim_protocols(void)
&shim_lock_guid, &shim_lock_interface);
}
+#define VENDOR_VERIFY L"openSUSE_Verify"
+
+/* Show the built-in certificate prompt if necessary */
+static int builtin_cert_prompt(void)
+{
+ EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
+ EFI_STATUS status;
+ UINT32 attributes;
+ UINTN len = sizeof(UINT8);
+ UINT8 data;
+
+ use_builtin_cert = FALSE;
+
+ if (vendor_cert_size == 0)
+ return 0;
+
+ status = uefi_call_wrapper(RT->GetVariable, 5, VENDOR_VERIFY,
+ &shim_lock_guid, &attributes,
+ &len, &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 = uefi_call_wrapper(RT->SetVariable, 5,
+ 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 = uefi_call_wrapper(RT->SetVariable, 5,
+ 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;
+}
+
EFI_STATUS efi_main (EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *passed_systab)
{
EFI_STATUS efi_status;
@@ -1895,6 +1971,8 @@ EFI_STATUS efi_main (EFI_HANDLE image_ha
*/
hook_system_services(systab);
loader_is_participating = 0;
+ if (builtin_cert_prompt() != 0)
+ return EFI_ABORTED;
}
}
Index: shim-0.7/MokManager.c
===================================================================
--- shim-0.7.orig/MokManager.c
+++ shim-0.7/MokManager.c
@@ -1701,6 +1701,36 @@ static INTN mok_pw_prompt (void *MokPW,
return -1;
}
+static INTN mok_clear_verify_prompt(void *ClearVerify, UINTN ClearVerifySize) {
+ EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
+ 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);
+ }
+ if (status != EFI_SUCCESS)
+ return -1;
+
+ status = uefi_call_wrapper(RT->SetVariable, 5,
+ 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");
+ uefi_call_wrapper(RT->ResetSystem, 4, EfiResetWarm,
+ EFI_SUCCESS, 0, NULL);
+ console_notify(L"Failed to reboot");
+ return -1;
+}
+
static BOOLEAN verify_certificate(UINT8 *cert, UINTN size)
{
X509 *X509Cert;
@@ -2053,6 +2083,7 @@ typedef enum {
MOK_CHANGE_SB,
MOK_SET_PW,
MOK_CHANGE_DB,
+ MOK_CLEAR_VERIFY,
MOK_KEY_ENROLL,
MOK_HASH_ENROLL
} mok_menu_item;
@@ -2064,7 +2095,8 @@ static EFI_STATUS enter_mok_menu(EFI_HAN
void *MokPW, UINTN MokPWSize,
void *MokDB, UINTN MokDBSize,
void *MokXNew, UINTN MokXNewSize,
- void *MokXDel, UINTN MokXDelSize)
+ void *MokXDel, UINTN MokXDelSize,
+ void *ClearVerify, UINTN ClearVerifySize)
{
CHAR16 **menu_strings;
mok_menu_item *menu_item;
@@ -2138,6 +2170,9 @@ static EFI_STATUS enter_mok_menu(EFI_HAN
if (MokDB)
menucount++;
+ if (ClearVerify)
+ menucount++;
+
menu_strings = AllocateZeroPool(sizeof(CHAR16 *) * (menucount + 1));
if (!menu_strings)
@@ -2207,6 +2242,12 @@ 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++;
@@ -2257,6 +2298,9 @@ static EFI_STATUS enter_mok_menu(EFI_HAN
case MOK_CHANGE_DB:
mok_db_prompt(MokDB, MokDBSize);
break;
+ case MOK_CLEAR_VERIFY:
+ mok_clear_verify_prompt(ClearVerify, ClearVerifySize);
+ break;
case MOK_KEY_ENROLL:
mok_key_enroll();
break;
@@ -2282,6 +2326,7 @@ static EFI_STATUS check_mok_request(EFI_
EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
UINTN MokNewSize = 0, MokDelSize = 0, MokSBSize = 0, MokPWSize = 0;
UINTN MokDBSize = 0, MokXNewSize = 0, MokXDelSize = 0;
+ UINTN ClearVerifySize = 0;
void *MokNew = NULL;
void *MokDel = NULL;
void *MokSB = NULL;
@@ -2289,6 +2334,7 @@ static EFI_STATUS check_mok_request(EFI_
void *MokDB = NULL;
void *MokXNew = NULL;
void *MokXDel = NULL;
+ void *ClearVerify = NULL;
EFI_STATUS status;
status = get_variable(L"MokNew", (UINT8 **)&MokNew, &MokNewSize,
@@ -2361,9 +2407,20 @@ static EFI_STATUS check_mok_request(EFI_
console_error(L"Could not retrieve MokXDel", status);
}
+ status = get_variable(L"ClearVerify", (UINT8 **)&ClearVerify, &ClearVerifySize,
+ shim_lock_guid);
+ if (status == EFI_SUCCESS) {
+ if (LibDeleteVariable(L"ClearVerify", &shim_lock_guid) != EFI_SUCCESS) {
+ console_notify(L"Failed to delete ClearVerify");
+ }
+ } else if (EFI_ERROR(status) && status != EFI_NOT_FOUND) {
+ console_error(L"Could not retrieve ClearVerify", status);
+ }
+
enter_mok_menu(image_handle, MokNew, MokNewSize, MokDel, MokDelSize,
MokSB, MokSBSize, MokPW, MokPWSize, MokDB, MokDBSize,
- MokXNew, MokXNewSize, MokXDel, MokXDelSize);
+ MokXNew, MokXNewSize, MokXDel, MokXDelSize,
+ ClearVerify, ClearVerifySize);
if (MokNew)
FreePool (MokNew);
@@ -2386,6 +2443,9 @@ static EFI_STATUS check_mok_request(EFI_
if (MokXDel)
FreePool (MokXDel);
+ if (ClearVerify)
+ FreePool (ClearVerify);
+
LibDeleteVariable(L"MokAuth", &shim_lock_guid);
LibDeleteVariable(L"MokDelAuth", &shim_lock_guid);
LibDeleteVariable(L"MokXAuth", &shim_lock_guid);
