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author | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2020-07-14 09:04:49 +0300 |
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committer | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2020-07-16 13:37:02 +0300 |
commit | 012c56ac76e1bdabc711a90898e81316e1d1a020 (patch) | |
tree | c91e58b8654fce27666af1852773b30aebe8ec80 /lib/efi_loader | |
parent | f96744b2509622302dbc6bd6f2f669fc406c24d3 (diff) | |
download | u-boot-012c56ac76e1bdabc711a90898e81316e1d1a020.tar.xz |
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>
Diffstat (limited to 'lib/efi_loader')
-rw-r--r-- | lib/efi_loader/efi_var_common.c | 155 | ||||
-rw-r--r-- | lib/efi_loader/efi_variable.c | 159 |
2 files changed, 155 insertions, 159 deletions
diff --git a/lib/efi_loader/efi_var_common.c b/lib/efi_loader/efi_var_common.c index 1e2be1135b..36e31b4d45 100644 --- a/lib/efi_loader/efi_var_common.c +++ b/lib/efi_loader/efi_var_common.c @@ -9,6 +9,16 @@ #include <efi_loader.h> #include <efi_variable.h> +enum efi_secure_mode { + EFI_MODE_SETUP, + EFI_MODE_USER, + EFI_MODE_AUDIT, + EFI_MODE_DEPLOYED, +}; + +static bool efi_secure_boot; +static enum efi_secure_mode efi_secure_mode; + /** * efi_efi_get_variable() - retrieve value of a UEFI variable * @@ -138,3 +148,148 @@ efi_status_t EFIAPI efi_query_variable_info( return EFI_EXIT(ret); } + +/** + * efi_set_secure_state - modify secure boot state variables + * @secure_boot: value of SecureBoot + * @setup_mode: value of SetupMode + * @audit_mode: value of AuditMode + * @deployed_mode: value of DeployedMode + * + * Modify secure boot status related variables as indicated. + * + * Return: status code + */ +static efi_status_t efi_set_secure_state(u8 secure_boot, u8 setup_mode, + u8 audit_mode, u8 deployed_mode) +{ + efi_status_t ret; + const u32 attributes_ro = EFI_VARIABLE_BOOTSERVICE_ACCESS | + EFI_VARIABLE_RUNTIME_ACCESS | + EFI_VARIABLE_READ_ONLY; + const u32 attributes_rw = EFI_VARIABLE_BOOTSERVICE_ACCESS | + EFI_VARIABLE_RUNTIME_ACCESS; + + efi_secure_boot = secure_boot; + + ret = efi_set_variable_int(L"SecureBoot", &efi_global_variable_guid, + attributes_ro, sizeof(secure_boot), + &secure_boot, false); + if (ret != EFI_SUCCESS) + goto err; + + ret = efi_set_variable_int(L"SetupMode", &efi_global_variable_guid, + attributes_ro, sizeof(setup_mode), + &setup_mode, false); + if (ret != EFI_SUCCESS) + goto err; + + ret = efi_set_variable_int(L"AuditMode", &efi_global_variable_guid, + audit_mode || setup_mode ? + attributes_ro : attributes_rw, + sizeof(audit_mode), &audit_mode, false); + if (ret != EFI_SUCCESS) + goto err; + + ret = efi_set_variable_int(L"DeployedMode", + &efi_global_variable_guid, + audit_mode || deployed_mode || setup_mode ? + attributes_ro : attributes_rw, + sizeof(deployed_mode), &deployed_mode, + false); +err: + return ret; +} + +/** + * efi_transfer_secure_state - handle a secure boot state transition + * @mode: new state + * + * Depending on @mode, secure boot related variables are updated. + * Those variables are *read-only* for users, efi_set_variable_int() + * is called here. + * + * Return: status code + */ +static efi_status_t efi_transfer_secure_state(enum efi_secure_mode mode) +{ + efi_status_t ret; + + EFI_PRINT("Switching secure state from %d to %d\n", efi_secure_mode, + mode); + + if (mode == EFI_MODE_DEPLOYED) { + ret = efi_set_secure_state(1, 0, 0, 1); + if (ret != EFI_SUCCESS) + goto err; + } else if (mode == EFI_MODE_AUDIT) { + ret = efi_set_variable_int(L"PK", &efi_global_variable_guid, + EFI_VARIABLE_BOOTSERVICE_ACCESS | + EFI_VARIABLE_RUNTIME_ACCESS, + 0, NULL, false); + if (ret != EFI_SUCCESS) + goto err; + + ret = efi_set_secure_state(0, 1, 1, 0); + if (ret != EFI_SUCCESS) + goto err; + } else if (mode == EFI_MODE_USER) { + ret = efi_set_secure_state(1, 0, 0, 0); + if (ret != EFI_SUCCESS) + goto err; + } else if (mode == EFI_MODE_SETUP) { + ret = efi_set_secure_state(0, 1, 0, 0); + if (ret != EFI_SUCCESS) + goto err; + } else { + return EFI_INVALID_PARAMETER; + } + + efi_secure_mode = mode; + + return EFI_SUCCESS; + +err: + /* TODO: What action should be taken here? */ + printf("ERROR: Secure state transition failed\n"); + return ret; +} + +efi_status_t efi_init_secure_state(void) +{ + enum efi_secure_mode mode = EFI_MODE_SETUP; + u8 efi_vendor_keys = 0; + efi_uintn_t size = 0; + efi_status_t ret; + + ret = efi_get_variable_int(L"PK", &efi_global_variable_guid, + NULL, &size, NULL, NULL); + if (ret == EFI_BUFFER_TOO_SMALL) { + if (IS_ENABLED(CONFIG_EFI_SECURE_BOOT)) + mode = EFI_MODE_USER; + } + + ret = efi_transfer_secure_state(mode); + if (ret != EFI_SUCCESS) + return ret; + + /* As we do not provide vendor keys this variable is always 0. */ + ret = efi_set_variable_int(L"VendorKeys", + &efi_global_variable_guid, + EFI_VARIABLE_BOOTSERVICE_ACCESS | + EFI_VARIABLE_RUNTIME_ACCESS | + EFI_VARIABLE_READ_ONLY, + sizeof(efi_vendor_keys), + &efi_vendor_keys, false); + return ret; +} + +/** + * efi_secure_boot_enabled - return if secure boot is enabled or not + * + * Return: true if enabled, false if disabled + */ +bool efi_secure_boot_enabled(void) +{ + return efi_secure_boot; +} diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c index eab5f005da..64dc3d6df9 100644 --- a/lib/efi_loader/efi_variable.c +++ b/lib/efi_loader/efi_variable.c @@ -19,165 +19,6 @@ #include <linux/compat.h> #include <u-boot/crc.h> -enum efi_secure_mode { - EFI_MODE_SETUP, - EFI_MODE_USER, - EFI_MODE_AUDIT, - EFI_MODE_DEPLOYED, -}; - -static bool efi_secure_boot; -static enum efi_secure_mode efi_secure_mode; -static u8 efi_vendor_keys; - -/** - * efi_set_secure_state - modify secure boot state variables - * @secure_boot: value of SecureBoot - * @setup_mode: value of SetupMode - * @audit_mode: value of AuditMode - * @deployed_mode: value of DeployedMode - * - * Modify secure boot status related variables as indicated. - * - * Return: status code - */ -static efi_status_t efi_set_secure_state(u8 secure_boot, u8 setup_mode, - u8 audit_mode, u8 deployed_mode) -{ - efi_status_t ret; - const u32 attributes_ro = EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS | - EFI_VARIABLE_READ_ONLY; - const u32 attributes_rw = EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS; - - efi_secure_boot = secure_boot; - - ret = efi_set_variable_int(L"SecureBoot", &efi_global_variable_guid, - attributes_ro, sizeof(secure_boot), - &secure_boot, false); - if (ret != EFI_SUCCESS) - goto err; - - ret = efi_set_variable_int(L"SetupMode", &efi_global_variable_guid, - attributes_ro, sizeof(setup_mode), - &setup_mode, false); - if (ret != EFI_SUCCESS) - goto err; - - ret = efi_set_variable_int(L"AuditMode", &efi_global_variable_guid, - audit_mode || setup_mode ? - attributes_ro : attributes_rw, - sizeof(audit_mode), &audit_mode, false); - if (ret != EFI_SUCCESS) - goto err; - - ret = efi_set_variable_int(L"DeployedMode", - &efi_global_variable_guid, - audit_mode || deployed_mode || setup_mode ? - attributes_ro : attributes_rw, - sizeof(deployed_mode), &deployed_mode, - false); -err: - return ret; -} - -/** - * efi_transfer_secure_state - handle a secure boot state transition - * @mode: new state - * - * Depending on @mode, secure boot related variables are updated. - * Those variables are *read-only* for users, efi_set_variable_int() - * is called here. - * - * Return: status code - */ -static efi_status_t efi_transfer_secure_state(enum efi_secure_mode mode) -{ - efi_status_t ret; - - EFI_PRINT("Switching secure state from %d to %d\n", efi_secure_mode, - mode); - - if (mode == EFI_MODE_DEPLOYED) { - ret = efi_set_secure_state(1, 0, 0, 1); - if (ret != EFI_SUCCESS) - goto err; - } else if (mode == EFI_MODE_AUDIT) { - ret = efi_set_variable_int(L"PK", &efi_global_variable_guid, - EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS, - 0, NULL, false); - if (ret != EFI_SUCCESS) - goto err; - - ret = efi_set_secure_state(0, 1, 1, 0); - if (ret != EFI_SUCCESS) - goto err; - } else if (mode == EFI_MODE_USER) { - ret = efi_set_secure_state(1, 0, 0, 0); - if (ret != EFI_SUCCESS) - goto err; - } else if (mode == EFI_MODE_SETUP) { - ret = efi_set_secure_state(0, 1, 0, 0); - if (ret != EFI_SUCCESS) - goto err; - } else { - return EFI_INVALID_PARAMETER; - } - - efi_secure_mode = mode; - - return EFI_SUCCESS; - -err: - /* TODO: What action should be taken here? */ - printf("ERROR: Secure state transition failed\n"); - return ret; -} - -/** - * efi_init_secure_state - initialize secure boot state - * - * Return: status code - */ -static efi_status_t efi_init_secure_state(void) -{ - enum efi_secure_mode mode = EFI_MODE_SETUP; - efi_uintn_t size = 0; - efi_status_t ret; - - ret = efi_get_variable_int(L"PK", &efi_global_variable_guid, - NULL, &size, NULL, NULL); - if (ret == EFI_BUFFER_TOO_SMALL) { - if (IS_ENABLED(CONFIG_EFI_SECURE_BOOT)) - mode = EFI_MODE_USER; - } - - ret = efi_transfer_secure_state(mode); - if (ret != EFI_SUCCESS) - return ret; - - /* As we do not provide vendor keys this variable is always 0. */ - ret = efi_set_variable_int(L"VendorKeys", - &efi_global_variable_guid, - EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS | - EFI_VARIABLE_READ_ONLY, - sizeof(efi_vendor_keys), - &efi_vendor_keys, false); - return ret; -} - -/** - * efi_secure_boot_enabled - return if secure boot is enabled or not - * - * Return: true if enabled, false if disabled - */ -bool efi_secure_boot_enabled(void) -{ - return efi_secure_boot; -} #ifdef CONFIG_EFI_SECURE_BOOT static u8 pkcs7_hdr[] = { |