From 55266a9b8ac71dace1109d61be549889cdd2f93f Mon Sep 17 00:00:00 2001 From: Grzegorz Bernacki Date: Mon, 2 Aug 2021 12:46:33 +0200 Subject: [PATCH] SecurityPkg: Add option to reset secure boot keys. This commit add option which allows reset content of Secure Boot keys and databases to default variables. Signed-off-by: Grzegorz Bernacki Reviewed-by: Sunny Wang Reviewed-by: Jiewen Yao Reviewed-by: Pete Batard Tested-by: Pete Batard # on Raspberry Pi 4 --- .../SecureBootConfigDxe/SecureBootConfig.vfr | 6 + .../SecureBootConfigDxe.inf | 1 + .../SecureBootConfigImpl.c | 153 ++++++++++++++++++ .../SecureBootConfigNvData.h | 2 + .../SecureBootConfigStrings.uni | 4 + 5 files changed, 166 insertions(+) diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfig.vfr b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfig.vfr index fa7e11848c..e4560c592c 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfig.vfr +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfig.vfr @@ -69,6 +69,12 @@ formset endif; endif; + text + help = STRING_TOKEN(STR_SECURE_RESET_TO_DEFAULTS_HELP), + text = STRING_TOKEN(STR_SECURE_RESET_TO_DEFAULTS), + flags = INTERACTIVE, + key = KEY_SECURE_BOOT_RESET_TO_DEFAULT; + endform; // diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf index 14c7311b08..420687a211 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf @@ -110,6 +110,7 @@ [Protocols] gEfiHiiConfigAccessProtocolGuid ## PRODUCES gEfiDevicePathProtocolGuid ## PRODUCES + gEfiHiiPopupProtocolGuid [Depex] gEfiHiiConfigRoutingProtocolGuid AND diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c index f527aa32e6..65a8188d6d 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c @@ -8,6 +8,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include "SecureBootConfigImpl.h" +#include #include #include #include @@ -4155,6 +4156,131 @@ ON_EXIT: return Status; } +/** + This function reinitializes Secure Boot variables with default values. + + @retval EFI_SUCCESS Success to update the signature list page + @retval others Fail to delete or enroll signature data. +**/ +STATIC EFI_STATUS +EFIAPI +KeyEnrollReset ( + VOID + ) +{ + EFI_STATUS Status; + UINT8 SetupMode; + + Status = EFI_SUCCESS; + + Status = SetSecureBootMode (CUSTOM_SECURE_BOOT_MODE); + if (EFI_ERROR(Status)) { + return Status; + } + + // Clear all the keys and databases + Status = DeleteDb (); + if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) { + DEBUG ((DEBUG_ERROR, "Fail to clear DB: %r\n", Status)); + return Status; + } + + Status = DeleteDbx (); + if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) { + DEBUG ((DEBUG_ERROR, "Fail to clear DBX: %r\n", Status)); + return Status; + } + + Status = DeleteDbt (); + if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) { + DEBUG ((DEBUG_ERROR, "Fail to clear DBT: %r\n", Status)); + return Status; + } + + Status = DeleteKEK (); + if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) { + DEBUG ((DEBUG_ERROR, "Fail to clear KEK: %r\n", Status)); + return Status; + } + + Status = DeletePlatformKey (); + if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) { + DEBUG ((DEBUG_ERROR, "Fail to clear PK: %r\n", Status)); + return Status; + } + + // After PK clear, Setup Mode shall be enabled + Status = GetSetupMode (&SetupMode); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Cannot get SetupMode variable: %r\n", + Status)); + return Status; + } + + if (SetupMode == USER_MODE) { + DEBUG((DEBUG_INFO, "Skipped - USER_MODE\n")); + return EFI_SUCCESS; + } + + Status = SetSecureBootMode (CUSTOM_SECURE_BOOT_MODE); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Cannot set CUSTOM_SECURE_BOOT_MODE: %r\n", + Status)); + return EFI_SUCCESS; + } + + // Enroll all the keys from default variables + Status = EnrollDbFromDefault (); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Cannot enroll db: %r\n", Status)); + goto error; + } + + Status = EnrollDbxFromDefault (); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Cannot enroll dbx: %r\n", Status)); + } + + Status = EnrollDbtFromDefault (); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Cannot enroll dbt: %r\n", Status)); + } + + Status = EnrollKEKFromDefault (); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Cannot enroll KEK: %r\n", Status)); + goto cleardbs; + } + + Status = EnrollPKFromDefault (); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Cannot enroll PK: %r\n", Status)); + goto clearKEK; + } + + Status = SetSecureBootMode (STANDARD_SECURE_BOOT_MODE); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "Cannot set CustomMode to STANDARD_SECURE_BOOT_MODE\n" + "Please do it manually, otherwise system can be easily compromised\n")); + } + + return Status; + +clearKEK: + DeleteKEK (); + +cleardbs: + DeleteDbt (); + DeleteDbx (); + DeleteDb (); + +error: + if (SetSecureBootMode (STANDARD_SECURE_BOOT_MODE) != EFI_SUCCESS) { + DEBUG ((DEBUG_ERROR, "Cannot set mode to Secure: %r\n", Status)); + } + return Status; +} + /** This function is called to provide results data to the driver. @@ -4206,6 +4332,8 @@ SecureBootCallback ( SECUREBOOT_CONFIG_PRIVATE_DATA *PrivateData; BOOLEAN GetBrowserDataResult; ENROLL_KEY_ERROR EnrollKeyErrorCode; + EFI_HII_POPUP_PROTOCOL *HiiPopup; + EFI_HII_POPUP_SELECTION UserSelection; Status = EFI_SUCCESS; SecureBootEnable = NULL; @@ -4756,6 +4884,31 @@ SecureBootCallback ( FreePool (SetupMode); } break; + case KEY_SECURE_BOOT_RESET_TO_DEFAULT: + { + Status = gBS->LocateProtocol (&gEfiHiiPopupProtocolGuid, NULL, (VOID **) &HiiPopup); + if (EFI_ERROR (Status)) { + return Status; + } + Status = HiiPopup->CreatePopup ( + HiiPopup, + EfiHiiPopupStyleInfo, + EfiHiiPopupTypeYesNo, + Private->HiiHandle, + STRING_TOKEN (STR_RESET_TO_DEFAULTS_POPUP), + &UserSelection + ); + if (UserSelection == EfiHiiPopupSelectionYes) { + Status = KeyEnrollReset (); + } + // + // Update secure boot strings after key reset + // + if (Status == EFI_SUCCESS) { + Status = UpdateSecureBootString (Private); + SecureBootExtractConfigFromVariable (Private, IfrNvData); + } + } default: break; } diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigNvData.h b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigNvData.h index 6e54a4b0f2..4ecc25efc3 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigNvData.h +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigNvData.h @@ -54,6 +54,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent #define KEY_VALUE_FROM_DBX_TO_LIST_FORM 0x100f +#define KEY_SECURE_BOOT_RESET_TO_DEFAULT 0x1010 + #define KEY_SECURE_BOOT_OPTION 0x1100 #define KEY_SECURE_BOOT_PK_OPTION 0x1101 #define KEY_SECURE_BOOT_KEK_OPTION 0x1102 diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigStrings.uni b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigStrings.uni index ac783453cc..0d01701de7 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigStrings.uni +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigStrings.uni @@ -21,6 +21,10 @@ SPDX-License-Identifier: BSD-2-Clause-Patent #string STR_SECURE_BOOT_PROMPT #language en-US "Attempt Secure Boot" #string STR_SECURE_BOOT_HELP #language en-US "Enable/Disable the Secure Boot feature after platform reset" +#string STR_SECURE_RESET_TO_DEFAULTS_HELP #language en-US "Enroll keys with data from default variables" +#string STR_SECURE_RESET_TO_DEFAULTS #language en-US "Reset Secure Boot Keys" +#string STR_RESET_TO_DEFAULTS_POPUP #language en-US "Secure Boot Keys & databases will be initialized from defaults.\n Are you sure?" + #string STR_SECURE_BOOT_ENROLL_SIGNATURE #language en-US "Enroll Signature" #string STR_SECURE_BOOT_DELETE_SIGNATURE #language en-US "Delete Signature" #string STR_SECURE_BOOT_DELETE_LIST_FORM #language en-US "Delete Signature List Form" -- 2.39.2