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efi_loader: restructure code for TEE variables
When using secure boot functions needed both for file and TEE based UEFI variables have to be moved to the common code module efi_var_common.c. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
parent
f96744b250
commit
012c56ac76
@ -195,4 +195,11 @@ efi_status_t efi_var_mem_ins(u16 *variable_name,
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*/
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u64 efi_var_mem_free(void);
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/**
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* efi_init_secure_state - initialize secure boot state
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*
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* Return: status code
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*/
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efi_status_t efi_init_secure_state(void);
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#endif
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@ -9,6 +9,16 @@
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#include <efi_loader.h>
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#include <efi_variable.h>
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enum efi_secure_mode {
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EFI_MODE_SETUP,
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EFI_MODE_USER,
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EFI_MODE_AUDIT,
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EFI_MODE_DEPLOYED,
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};
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static bool efi_secure_boot;
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static enum efi_secure_mode efi_secure_mode;
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/**
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* efi_efi_get_variable() - retrieve value of a UEFI variable
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*
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@ -138,3 +148,148 @@ efi_status_t EFIAPI efi_query_variable_info(
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return EFI_EXIT(ret);
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}
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/**
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* efi_set_secure_state - modify secure boot state variables
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* @secure_boot: value of SecureBoot
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* @setup_mode: value of SetupMode
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* @audit_mode: value of AuditMode
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* @deployed_mode: value of DeployedMode
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*
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* Modify secure boot status related variables as indicated.
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*
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* Return: status code
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*/
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static efi_status_t efi_set_secure_state(u8 secure_boot, u8 setup_mode,
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u8 audit_mode, u8 deployed_mode)
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{
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efi_status_t ret;
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const u32 attributes_ro = EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS |
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EFI_VARIABLE_READ_ONLY;
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const u32 attributes_rw = EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS;
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efi_secure_boot = secure_boot;
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ret = efi_set_variable_int(L"SecureBoot", &efi_global_variable_guid,
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attributes_ro, sizeof(secure_boot),
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&secure_boot, false);
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if (ret != EFI_SUCCESS)
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goto err;
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ret = efi_set_variable_int(L"SetupMode", &efi_global_variable_guid,
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attributes_ro, sizeof(setup_mode),
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&setup_mode, false);
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if (ret != EFI_SUCCESS)
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goto err;
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ret = efi_set_variable_int(L"AuditMode", &efi_global_variable_guid,
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audit_mode || setup_mode ?
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attributes_ro : attributes_rw,
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sizeof(audit_mode), &audit_mode, false);
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if (ret != EFI_SUCCESS)
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goto err;
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ret = efi_set_variable_int(L"DeployedMode",
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&efi_global_variable_guid,
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audit_mode || deployed_mode || setup_mode ?
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attributes_ro : attributes_rw,
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sizeof(deployed_mode), &deployed_mode,
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false);
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err:
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return ret;
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}
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/**
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* efi_transfer_secure_state - handle a secure boot state transition
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* @mode: new state
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*
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* Depending on @mode, secure boot related variables are updated.
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* Those variables are *read-only* for users, efi_set_variable_int()
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* is called here.
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*
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* Return: status code
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*/
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static efi_status_t efi_transfer_secure_state(enum efi_secure_mode mode)
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{
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efi_status_t ret;
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EFI_PRINT("Switching secure state from %d to %d\n", efi_secure_mode,
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mode);
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if (mode == EFI_MODE_DEPLOYED) {
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ret = efi_set_secure_state(1, 0, 0, 1);
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if (ret != EFI_SUCCESS)
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goto err;
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} else if (mode == EFI_MODE_AUDIT) {
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ret = efi_set_variable_int(L"PK", &efi_global_variable_guid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS,
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0, NULL, false);
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if (ret != EFI_SUCCESS)
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goto err;
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ret = efi_set_secure_state(0, 1, 1, 0);
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if (ret != EFI_SUCCESS)
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goto err;
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} else if (mode == EFI_MODE_USER) {
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ret = efi_set_secure_state(1, 0, 0, 0);
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if (ret != EFI_SUCCESS)
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goto err;
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} else if (mode == EFI_MODE_SETUP) {
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ret = efi_set_secure_state(0, 1, 0, 0);
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if (ret != EFI_SUCCESS)
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goto err;
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} else {
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return EFI_INVALID_PARAMETER;
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}
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efi_secure_mode = mode;
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return EFI_SUCCESS;
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err:
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/* TODO: What action should be taken here? */
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printf("ERROR: Secure state transition failed\n");
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return ret;
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}
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efi_status_t efi_init_secure_state(void)
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{
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enum efi_secure_mode mode = EFI_MODE_SETUP;
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u8 efi_vendor_keys = 0;
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efi_uintn_t size = 0;
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efi_status_t ret;
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ret = efi_get_variable_int(L"PK", &efi_global_variable_guid,
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NULL, &size, NULL, NULL);
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if (ret == EFI_BUFFER_TOO_SMALL) {
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if (IS_ENABLED(CONFIG_EFI_SECURE_BOOT))
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mode = EFI_MODE_USER;
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}
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ret = efi_transfer_secure_state(mode);
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if (ret != EFI_SUCCESS)
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return ret;
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/* As we do not provide vendor keys this variable is always 0. */
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ret = efi_set_variable_int(L"VendorKeys",
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&efi_global_variable_guid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS |
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EFI_VARIABLE_READ_ONLY,
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sizeof(efi_vendor_keys),
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&efi_vendor_keys, false);
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return ret;
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}
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/**
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* efi_secure_boot_enabled - return if secure boot is enabled or not
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*
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* Return: true if enabled, false if disabled
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*/
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bool efi_secure_boot_enabled(void)
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{
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return efi_secure_boot;
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}
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@ -19,165 +19,6 @@
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#include <linux/compat.h>
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#include <u-boot/crc.h>
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enum efi_secure_mode {
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EFI_MODE_SETUP,
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EFI_MODE_USER,
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EFI_MODE_AUDIT,
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EFI_MODE_DEPLOYED,
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};
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static bool efi_secure_boot;
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static enum efi_secure_mode efi_secure_mode;
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static u8 efi_vendor_keys;
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/**
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* efi_set_secure_state - modify secure boot state variables
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* @secure_boot: value of SecureBoot
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* @setup_mode: value of SetupMode
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* @audit_mode: value of AuditMode
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* @deployed_mode: value of DeployedMode
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*
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* Modify secure boot status related variables as indicated.
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*
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* Return: status code
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*/
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static efi_status_t efi_set_secure_state(u8 secure_boot, u8 setup_mode,
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u8 audit_mode, u8 deployed_mode)
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{
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efi_status_t ret;
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const u32 attributes_ro = EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS |
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EFI_VARIABLE_READ_ONLY;
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const u32 attributes_rw = EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS;
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efi_secure_boot = secure_boot;
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ret = efi_set_variable_int(L"SecureBoot", &efi_global_variable_guid,
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attributes_ro, sizeof(secure_boot),
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&secure_boot, false);
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if (ret != EFI_SUCCESS)
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goto err;
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ret = efi_set_variable_int(L"SetupMode", &efi_global_variable_guid,
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attributes_ro, sizeof(setup_mode),
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&setup_mode, false);
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if (ret != EFI_SUCCESS)
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goto err;
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ret = efi_set_variable_int(L"AuditMode", &efi_global_variable_guid,
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audit_mode || setup_mode ?
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attributes_ro : attributes_rw,
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sizeof(audit_mode), &audit_mode, false);
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if (ret != EFI_SUCCESS)
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goto err;
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ret = efi_set_variable_int(L"DeployedMode",
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&efi_global_variable_guid,
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audit_mode || deployed_mode || setup_mode ?
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attributes_ro : attributes_rw,
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sizeof(deployed_mode), &deployed_mode,
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false);
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err:
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return ret;
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}
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/**
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* efi_transfer_secure_state - handle a secure boot state transition
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* @mode: new state
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*
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* Depending on @mode, secure boot related variables are updated.
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* Those variables are *read-only* for users, efi_set_variable_int()
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* is called here.
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*
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* Return: status code
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*/
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static efi_status_t efi_transfer_secure_state(enum efi_secure_mode mode)
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{
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efi_status_t ret;
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EFI_PRINT("Switching secure state from %d to %d\n", efi_secure_mode,
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mode);
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if (mode == EFI_MODE_DEPLOYED) {
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ret = efi_set_secure_state(1, 0, 0, 1);
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if (ret != EFI_SUCCESS)
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goto err;
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} else if (mode == EFI_MODE_AUDIT) {
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ret = efi_set_variable_int(L"PK", &efi_global_variable_guid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS,
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0, NULL, false);
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if (ret != EFI_SUCCESS)
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goto err;
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ret = efi_set_secure_state(0, 1, 1, 0);
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if (ret != EFI_SUCCESS)
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goto err;
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} else if (mode == EFI_MODE_USER) {
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ret = efi_set_secure_state(1, 0, 0, 0);
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if (ret != EFI_SUCCESS)
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goto err;
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} else if (mode == EFI_MODE_SETUP) {
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ret = efi_set_secure_state(0, 1, 0, 0);
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if (ret != EFI_SUCCESS)
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goto err;
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} else {
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return EFI_INVALID_PARAMETER;
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}
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efi_secure_mode = mode;
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return EFI_SUCCESS;
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err:
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/* TODO: What action should be taken here? */
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printf("ERROR: Secure state transition failed\n");
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return ret;
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}
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/**
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* efi_init_secure_state - initialize secure boot state
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*
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* Return: status code
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*/
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static efi_status_t efi_init_secure_state(void)
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{
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enum efi_secure_mode mode = EFI_MODE_SETUP;
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efi_uintn_t size = 0;
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efi_status_t ret;
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ret = efi_get_variable_int(L"PK", &efi_global_variable_guid,
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NULL, &size, NULL, NULL);
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if (ret == EFI_BUFFER_TOO_SMALL) {
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if (IS_ENABLED(CONFIG_EFI_SECURE_BOOT))
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mode = EFI_MODE_USER;
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}
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ret = efi_transfer_secure_state(mode);
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if (ret != EFI_SUCCESS)
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return ret;
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/* As we do not provide vendor keys this variable is always 0. */
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ret = efi_set_variable_int(L"VendorKeys",
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&efi_global_variable_guid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS |
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EFI_VARIABLE_READ_ONLY,
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sizeof(efi_vendor_keys),
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&efi_vendor_keys, false);
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return ret;
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}
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/**
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* efi_secure_boot_enabled - return if secure boot is enabled or not
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*
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* Return: true if enabled, false if disabled
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*/
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bool efi_secure_boot_enabled(void)
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{
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return efi_secure_boot;
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}
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#ifdef CONFIG_EFI_SECURE_BOOT
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static u8 pkcs7_hdr[] = {
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