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eficonfig: EFI_VARIABLE_APPEND_WRITE is not set for null key
The signed null key with authenticated header is used to clear the PK, KEK, db and dbx. When CONFIG_EFI_MM_COMM_TEE is enabled (StMM and OP-TEE based RPMB storage is used as the EFI variable storage), clearing KEK, db and dbx by enrolling a signed null key does not work as expected if EFI_VARIABLE_APPEND_WRITE attritube is set. This commit checks the selected file is null key, then EFI_VARIABLE_APPEND_WRITE attibute will not be used for the null key. Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
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parent
9ba35e64fa
commit
ad50ca5019
1 changed files with 36 additions and 2 deletions
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@ -72,6 +72,28 @@ static bool file_have_auth_header(void *buf, efi_uintn_t size)
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return true;
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}
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/**
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* file_is_null_key() - check the file is an authenticated and signed null key
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*
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* @auth: pointer to the file
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* @size: file size
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* @null_key: pointer to store the result
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* Return: status code
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*/
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static efi_status_t file_is_null_key(struct efi_variable_authentication_2 *auth,
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efi_uintn_t size, bool *null_key)
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{
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efi_uintn_t auth_size =
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sizeof(auth->time_stamp) + auth->auth_info.hdr.dwLength;
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if (size < auth_size)
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return EFI_INVALID_PARAMETER;
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*null_key = (size == auth_size);
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return EFI_SUCCESS;
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}
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/**
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* eficonfig_process_enroll_key() - enroll key into signature database
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*
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@ -84,6 +106,7 @@ static efi_status_t eficonfig_process_enroll_key(void *data)
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char *buf = NULL;
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efi_uintn_t size;
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efi_status_t ret;
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bool null_key = false;
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struct efi_file_handle *f = NULL;
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struct efi_device_path *full_dp = NULL;
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struct eficonfig_select_file_info file_info;
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@ -149,13 +172,24 @@ static efi_status_t eficonfig_process_enroll_key(void *data)
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goto out;
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}
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ret = file_is_null_key((struct efi_variable_authentication_2 *)buf,
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size, &null_key);
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if (ret != EFI_SUCCESS) {
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eficonfig_print_msg("ERROR! Invalid file format.");
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goto out;
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}
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attr = EFI_VARIABLE_NON_VOLATILE |
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS |
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EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
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/* PK can enroll only one certificate */
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if (u16_strcmp(data, u"PK")) {
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/*
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* PK can enroll only one certificate.
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* The signed null key is used to clear KEK, db and dbx.
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* EFI_VARIABLE_APPEND_WRITE attribute must not be set in these cases.
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*/
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if (u16_strcmp(data, u"PK") && !null_key) {
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efi_uintn_t db_size = 0;
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/* check the variable exists. If exists, add APPEND_WRITE attribute */
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