mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 08:58:52 +09:00
![Sam Protsenko](/assets/img/avatar_default.png)
Update libavb to commit 5fbb42a189aa in AOSP/master, because new version has support for super partition [1], which we need for implementing Android dynamic partitions. All changes from previous patches for libavb in U-Boot are accounted for in this commit: - commitecc6f6bea6
("libavb: Handle wrong hashtree_error_mode in avb_append_options()") - commit897a1d947e
("libavb: Update SPDX tag style") - commitd8f9d2af96
("avb2.0: add Android Verified Boot 2.0 library") Tested on X15: ## Android Verified Boot 2.0 version 1.1.0 read_is_device_unlocked not supported yet read_rollback_index not supported yet read_is_device_unlocked not supported yet Verification passed successfully AVB verification OK. Unit test passes: $ ./test/py/test.py --bd sandbox --build -k test_avb test/py/tests/test_android/test_avb.py ss..s. [1]49936b4c01
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Eugeniu Rosca <rosca.eugeniu@gmail.com> Acked-by: Igor Opaniuk <igor.opaniuk@gmail.com>
382 lines
17 KiB
C
382 lines
17 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/*
|
|
* Copyright (C) 2016 The Android Open Source Project
|
|
*/
|
|
|
|
#if !defined(AVB_INSIDE_LIBAVB_H) && !defined(AVB_COMPILATION)
|
|
#error "Never include this file directly, include libavb.h instead."
|
|
#endif
|
|
|
|
#ifndef AVB_SLOT_VERIFY_H_
|
|
#define AVB_SLOT_VERIFY_H_
|
|
|
|
#include "avb_ops.h"
|
|
#include "avb_vbmeta_image.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Return codes used in avb_slot_verify(), see that function for
|
|
* documentation for each field.
|
|
*
|
|
* Use avb_slot_verify_result_to_string() to get a textual
|
|
* representation usable for error/debug output.
|
|
*/
|
|
typedef enum {
|
|
AVB_SLOT_VERIFY_RESULT_OK,
|
|
AVB_SLOT_VERIFY_RESULT_ERROR_OOM,
|
|
AVB_SLOT_VERIFY_RESULT_ERROR_IO,
|
|
AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION,
|
|
AVB_SLOT_VERIFY_RESULT_ERROR_ROLLBACK_INDEX,
|
|
AVB_SLOT_VERIFY_RESULT_ERROR_PUBLIC_KEY_REJECTED,
|
|
AVB_SLOT_VERIFY_RESULT_ERROR_INVALID_METADATA,
|
|
AVB_SLOT_VERIFY_RESULT_ERROR_UNSUPPORTED_VERSION,
|
|
AVB_SLOT_VERIFY_RESULT_ERROR_INVALID_ARGUMENT
|
|
} AvbSlotVerifyResult;
|
|
|
|
/* Various error handling modes for when verification fails using a
|
|
* hashtree at runtime inside the HLOS.
|
|
*
|
|
* AVB_HASHTREE_ERROR_MODE_RESTART_AND_INVALIDATE means that the OS
|
|
* will invalidate the current slot and restart.
|
|
*
|
|
* AVB_HASHTREE_ERROR_MODE_RESTART means that the OS will restart.
|
|
*
|
|
* AVB_HASHTREE_ERROR_MODE_EIO means that an EIO error will be
|
|
* returned to applications.
|
|
*
|
|
* AVB_HASHTREE_ERROR_MODE_LOGGING means that errors will be logged
|
|
* and corrupt data may be returned to applications. This mode should
|
|
* be used ONLY for diagnostics and debugging. It cannot be used
|
|
* unless AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR is also
|
|
* used.
|
|
*
|
|
* AVB_HASHTREE_ERROR_MODE_MANAGED_RESTART_AND_EIO means that either
|
|
* AVB_HASHTREE_ERROR_MODE_RESTART or AVB_HASHTREE_ERROR_MODE_EIO is used
|
|
* depending on state. This mode implements a state machine whereby
|
|
* AVB_HASHTREE_ERROR_MODE_RESTART is used by default and when
|
|
* AVB_SLOT_VERIFY_FLAGS_RESTART_CAUSED_BY_HASHTREE_CORRUPTION is passed the
|
|
* mode transitions to AVB_HASHTREE_ERROR_MODE_EIO. When a new OS has been
|
|
* detected the device transitions back to the AVB_HASHTREE_ERROR_MODE_RESTART
|
|
* mode. To do this persistent storage is needed - specifically this means that
|
|
* the passed in AvbOps will need to have the read_persistent_value() and
|
|
* write_persistent_value() operations implemented. The name of the persistent
|
|
* value used is "avb.managed_verity_mode" and 32 bytes of storage is needed.
|
|
*/
|
|
typedef enum {
|
|
AVB_HASHTREE_ERROR_MODE_RESTART_AND_INVALIDATE,
|
|
AVB_HASHTREE_ERROR_MODE_RESTART,
|
|
AVB_HASHTREE_ERROR_MODE_EIO,
|
|
AVB_HASHTREE_ERROR_MODE_LOGGING,
|
|
AVB_HASHTREE_ERROR_MODE_MANAGED_RESTART_AND_EIO
|
|
} AvbHashtreeErrorMode;
|
|
|
|
/* Flags that influence how avb_slot_verify() works.
|
|
*
|
|
* If AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR is NOT set then
|
|
* avb_slot_verify() will bail out as soon as an error is encountered
|
|
* and |out_data| is set only if AVB_SLOT_VERIFY_RESULT_OK is
|
|
* returned.
|
|
*
|
|
* Otherwise if AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR is set
|
|
* avb_slot_verify() will continue verification efforts and |out_data|
|
|
* is also set if AVB_SLOT_VERIFY_RESULT_ERROR_PUBLIC_KEY_REJECTED,
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION, or
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_ROLLBACK_INDEX is returned. It is
|
|
* undefined which error is returned if more than one distinct error
|
|
* is encountered. It is guaranteed that AVB_SLOT_VERIFY_RESULT_OK is
|
|
* returned if, and only if, there are no errors. This mode is needed
|
|
* to boot valid but unverified slots when the device is unlocked.
|
|
*
|
|
* Also, if AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR is set the
|
|
* contents loaded from |requested_partition| will be the contents of
|
|
* the entire partition instead of just the size specified in the hash
|
|
* descriptor.
|
|
*
|
|
* The AVB_SLOT_VERIFY_FLAGS_RESTART_CAUSED_BY_HASHTREE_CORRUPTION flag
|
|
* should be set if using AVB_HASHTREE_ERROR_MODE_MANAGED_RESTART_AND_EIO
|
|
* and the reason the boot loader is running is because the device
|
|
* was restarted by the dm-verity driver.
|
|
*
|
|
* If the AVB_SLOT_VERIFY_FLAGS_NO_VBMETA_PARTITION flag is set then
|
|
* data won't be loaded from the "vbmeta" partition and the
|
|
* |validate_vbmeta_public_key| operation is never called. Instead, the
|
|
* vbmeta structs in |requested_partitions| are loaded and processed and the
|
|
* |validate_public_key_for_partition| operation is called for each of these
|
|
* vbmeta structs. This flag is useful when booting into recovery on a device
|
|
* not using A/B - see section "Booting into recovery" in README.md for
|
|
* more information.
|
|
*/
|
|
typedef enum {
|
|
AVB_SLOT_VERIFY_FLAGS_NONE = 0,
|
|
AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR = (1 << 0),
|
|
AVB_SLOT_VERIFY_FLAGS_RESTART_CAUSED_BY_HASHTREE_CORRUPTION = (1 << 1),
|
|
AVB_SLOT_VERIFY_FLAGS_NO_VBMETA_PARTITION = (1 << 2),
|
|
} AvbSlotVerifyFlags;
|
|
|
|
/* Get a textual representation of |result|. */
|
|
const char* avb_slot_verify_result_to_string(AvbSlotVerifyResult result);
|
|
|
|
/* Maximum number of rollback index locations supported. */
|
|
#define AVB_MAX_NUMBER_OF_ROLLBACK_INDEX_LOCATIONS 32
|
|
|
|
/* AvbPartitionData contains data loaded from partitions when using
|
|
* avb_slot_verify(). The |partition_name| field contains the name of
|
|
* the partition (without A/B suffix), |data| points to the loaded
|
|
* data which is |data_size| bytes long. If |preloaded| is set to true,
|
|
* this structure dose not own |data|. The caller of |avb_slot_verify|
|
|
* needs to make sure that the preloaded data outlives this
|
|
* |AvbPartitionData| structure.
|
|
*
|
|
* Note that this is strictly less than the partition size - it's only
|
|
* the image stored there, not the entire partition nor any of the
|
|
* metadata.
|
|
*/
|
|
typedef struct {
|
|
char* partition_name;
|
|
uint8_t* data;
|
|
size_t data_size;
|
|
bool preloaded;
|
|
} AvbPartitionData;
|
|
|
|
/* AvbVBMetaData contains a vbmeta struct loaded from a partition when
|
|
* using avb_slot_verify(). The |partition_name| field contains the
|
|
* name of the partition (without A/B suffix), |vbmeta_data| points to
|
|
* the loaded data which is |vbmeta_size| bytes long.
|
|
*
|
|
* The |verify_result| field contains the result of
|
|
* avb_vbmeta_image_verify() on the data. This is guaranteed to be
|
|
* AVB_VBMETA_VERIFY_RESULT_OK for all vbmeta images if
|
|
* avb_slot_verify() returns AVB_SLOT_VERIFY_RESULT_OK.
|
|
*
|
|
* You can use avb_descriptor_get_all(), avb_descriptor_foreach(), and
|
|
* avb_vbmeta_image_header_to_host_byte_order() with this data.
|
|
*/
|
|
typedef struct {
|
|
char* partition_name;
|
|
uint8_t* vbmeta_data;
|
|
size_t vbmeta_size;
|
|
AvbVBMetaVerifyResult verify_result;
|
|
} AvbVBMetaData;
|
|
|
|
/* AvbSlotVerifyData contains data needed to boot a particular slot
|
|
* and is returned by avb_slot_verify() if partitions in a slot are
|
|
* successfully verified.
|
|
*
|
|
* All data pointed to by this struct - including data in each item in
|
|
* the |partitions| array - will be freed when the
|
|
* avb_slot_verify_data_free() function is called.
|
|
*
|
|
* The |ab_suffix| field is the copy of the of |ab_suffix| field
|
|
* passed to avb_slot_verify(). It is the A/B suffix of the slot. This
|
|
* value includes the leading underscore - typical values are "" (if
|
|
* no slots are in use), "_a" (for the first slot), and "_b" (for the
|
|
* second slot).
|
|
*
|
|
* The VBMeta images that were checked are available in the
|
|
* |vbmeta_images| field. The field |num_vbmeta_images| contains the
|
|
* number of elements in this array. The first element -
|
|
* vbmeta_images[0] - is guaranteed to be from the partition with the
|
|
* top-level vbmeta struct. This is usually the "vbmeta" partition in
|
|
* the requested slot but if there is no "vbmeta" partition it can
|
|
* also be the "boot" partition.
|
|
*
|
|
* The partitions loaded and verified from from the slot are
|
|
* accessible in the |loaded_partitions| array. The field
|
|
* |num_loaded_partitions| contains the number of elements in this
|
|
* array. The order of partitions in this array may not necessarily be
|
|
* the same order as in the passed-in |requested_partitions| array.
|
|
*
|
|
* Rollback indexes for the verified slot are stored in the
|
|
* |rollback_indexes| field. Note that avb_slot_verify() will NEVER
|
|
* modify stored_rollback_index[n] locations e.g. it will never use
|
|
* the write_rollback_index() AvbOps operation. Instead it is the job
|
|
* of the caller of avb_slot_verify() to do this based on e.g. A/B
|
|
* policy and other factors. See libavb_ab/avb_ab_flow.c for an
|
|
* example of how to do this.
|
|
*
|
|
* The |cmdline| field is a NUL-terminated string in UTF-8 resulting
|
|
* from concatenating all |AvbKernelCmdlineDescriptor| and then
|
|
* performing proper substitution of the variables
|
|
* $(ANDROID_SYSTEM_PARTUUID), $(ANDROID_BOOT_PARTUUID), and
|
|
* $(ANDROID_VBMETA_PARTUUID) using the
|
|
* get_unique_guid_for_partition() operation in |AvbOps|. Additionally
|
|
* $(ANDROID_VERITY_MODE) will be replaced with the proper dm-verity
|
|
* option depending on the value of |hashtree_error_mode|.
|
|
*
|
|
* Additionally, the |cmdline| field will have the following kernel
|
|
* command-line options set (unless verification is disabled, see
|
|
* below):
|
|
*
|
|
* androidboot.veritymode: This is set to 'disabled' if the
|
|
* AVB_VBMETA_IMAGE_FLAGS_HASHTREE_DISABLED flag is set in top-level
|
|
* vbmeta struct. Otherwise it is set to 'enforcing' if the
|
|
* passed-in hashtree error mode is AVB_HASHTREE_ERROR_MODE_RESTART
|
|
* or AVB_HASHTREE_ERROR_MODE_RESTART_AND_INVALIDATE, 'eio' if it's
|
|
* set to AVB_HASHTREE_ERROR_MODE_EIO, and 'logging' if it's set to
|
|
* AVB_HASHTREE_ERROR_MODE_LOGGING.
|
|
*
|
|
* androidboot.veritymode.managed: This is set to 'yes' only
|
|
* if hashtree validation isn't disabled and the passed-in hashtree
|
|
* error mode is AVB_HASHTREE_ERROR_MODE_MANAGED_RESTART_AND_EIO.
|
|
*
|
|
* androidboot.vbmeta.invalidate_on_error: This is set to 'yes' only
|
|
* if hashtree validation isn't disabled and the passed-in hashtree
|
|
* error mode is AVB_HASHTREE_ERROR_MODE_RESTART_AND_INVALIDATE.
|
|
*
|
|
* androidboot.vbmeta.device_state: set to "locked" or "unlocked"
|
|
* depending on the result of the result of AvbOps's
|
|
* read_is_unlocked() function.
|
|
*
|
|
* androidboot.vbmeta.{hash_alg, size, digest}: Will be set to
|
|
* the digest of all images in |vbmeta_images|.
|
|
*
|
|
* androidboot.vbmeta.device: This is set to the value
|
|
* PARTUUID=$(ANDROID_VBMETA_PARTUUID) before substitution so it
|
|
* will end up pointing to the vbmeta partition for the verified
|
|
* slot. If there is no vbmeta partition it will point to the boot
|
|
* partition of the verified slot. If the flag
|
|
* AVB_SLOT_VERIFY_FLAGS_NO_VBMETA_PARTITION is used, this is not
|
|
* set.
|
|
*
|
|
* androidboot.vbmeta.avb_version: This is set to the decimal value
|
|
* of AVB_VERSION_MAJOR followed by a dot followed by the decimal
|
|
* value of AVB_VERSION_MINOR, for example "1.0" or "1.4". This
|
|
* version number represents the vbmeta file format version
|
|
* supported by libavb copy used in the boot loader. This is not
|
|
* necessarily the same version number of the on-disk metadata for
|
|
* the slot that was verified.
|
|
*
|
|
* Note that androidboot.slot_suffix is not set in the |cmdline| field
|
|
* in |AvbSlotVerifyData| - you will have to set this yourself.
|
|
*
|
|
* If the |AVB_VBMETA_IMAGE_FLAGS_VERIFICATION_DISABLED| flag is set
|
|
* in the top-level vbmeta struct then only the top-level vbmeta
|
|
* struct is verified and descriptors will not processed. The return
|
|
* value will be set accordingly (if this flag is set via 'avbctl
|
|
* disable-verification' then the return value will be
|
|
* |AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION|) and
|
|
* |AvbSlotVerifyData| is returned. Additionally all partitions in the
|
|
* |requested_partitions| are loaded and the |cmdline| field is set to
|
|
* "root=PARTUUID=$(ANDROID_SYSTEM_PARTUUID)" and the GUID for the
|
|
* appropriate system partition is substituted in. Note that none of
|
|
* the androidboot.* options mentioned above will be set.
|
|
*
|
|
* The |resolved_hashtree_error_mode| is the the value of the passed
|
|
* avb_slot_verify()'s |hashtree_error_mode| parameter except that it never has
|
|
* the value AVB_HASHTREE_ERROR_MODE_MANAGED_RESTART_AND_EIO. If this value was
|
|
* passed in, then the restart/eio state machine is used resulting in
|
|
* |resolved_hashtree_error_mode| being set to either
|
|
* AVB_HASHTREE_ERROR_MODE_RESTART or AVB_HASHTREE_ERROR_MODE_EIO. If set to
|
|
* AVB_HASHTREE_ERROR_MODE_EIO the boot loader should present a RED warning
|
|
* screen for the user to click through before continuing to boot.
|
|
*
|
|
* This struct may grow in the future without it being considered an
|
|
* ABI break.
|
|
*/
|
|
typedef struct {
|
|
char* ab_suffix;
|
|
AvbVBMetaData* vbmeta_images;
|
|
size_t num_vbmeta_images;
|
|
AvbPartitionData* loaded_partitions;
|
|
size_t num_loaded_partitions;
|
|
char* cmdline;
|
|
uint64_t rollback_indexes[AVB_MAX_NUMBER_OF_ROLLBACK_INDEX_LOCATIONS];
|
|
AvbHashtreeErrorMode resolved_hashtree_error_mode;
|
|
} AvbSlotVerifyData;
|
|
|
|
/* Calculates a digest of all vbmeta images in |data| using
|
|
* the digest indicated by |digest_type|. Stores the result
|
|
* in |out_digest| which must be large enough to hold a digest
|
|
* of the requested type.
|
|
*/
|
|
void avb_slot_verify_data_calculate_vbmeta_digest(AvbSlotVerifyData* data,
|
|
AvbDigestType digest_type,
|
|
uint8_t* out_digest);
|
|
|
|
/* Frees a |AvbSlotVerifyData| including all data it points to. */
|
|
void avb_slot_verify_data_free(AvbSlotVerifyData* data);
|
|
|
|
/* Performs a full verification of the slot identified by |ab_suffix|
|
|
* and load and verify the contents of the partitions whose name is in
|
|
* the NULL-terminated string array |requested_partitions| (each
|
|
* partition must use hash verification). If not using A/B, pass an
|
|
* empty string (e.g. "", not NULL) for |ab_suffix|. This parameter
|
|
* must include the leading underscore, for example "_a" should be
|
|
* used to refer to the first slot.
|
|
*
|
|
* Typically the |requested_partitions| array only contains a single
|
|
* item for the boot partition, 'boot'.
|
|
*
|
|
* Verification includes loading and verifying data from the 'vbmeta',
|
|
* the requested hash partitions, and possibly other partitions (with
|
|
* |ab_suffix| appended), inspecting rollback indexes, and checking if
|
|
* the public key used to sign the data is acceptable. The functions
|
|
* in |ops| will be used to do this.
|
|
*
|
|
* If |out_data| is not NULL, it will be set to a newly allocated
|
|
* |AvbSlotVerifyData| struct containing all the data needed to
|
|
* actually boot the slot. This data structure should be freed with
|
|
* avb_slot_verify_data_free() when you are done with it. See below
|
|
* for when this is returned.
|
|
*
|
|
* The |flags| parameter is used to influence the semantics of
|
|
* avb_slot_verify() - for example the
|
|
* AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR flag can be used to
|
|
* ignore verification errors which is something needed in the
|
|
* UNLOCKED state. See the AvbSlotVerifyFlags enumeration for details.
|
|
*
|
|
* The |hashtree_error_mode| parameter should be set to the desired error
|
|
* handling mode. See the AvbHashtreeErrorMode enumeration for details.
|
|
*
|
|
* Also note that |out_data| is never set if
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_OOM, AVB_SLOT_VERIFY_RESULT_ERROR_IO,
|
|
* or AVB_SLOT_VERIFY_RESULT_ERROR_INVALID_METADATA is returned.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_OK is returned if everything is verified
|
|
* correctly and all public keys are accepted.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_PUBLIC_KEY_REJECTED is returned if
|
|
* everything is verified correctly out but one or more public keys
|
|
* are not accepted. This includes the case where integrity data is
|
|
* not signed.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_OOM is returned if unable to
|
|
* allocate memory.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_IO is returned if an I/O error
|
|
* occurred while trying to load data or get a rollback index.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION is returned if the data
|
|
* did not verify, e.g. the digest didn't match or signature checks
|
|
* failed.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_ROLLBACK_INDEX is returned if a
|
|
* rollback index was less than its stored value.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_INVALID_METADATA is returned if some
|
|
* of the metadata is invalid or inconsistent.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_UNSUPPORTED_VERSION is returned if
|
|
* some of the metadata requires a newer version of libavb than what
|
|
* is in use.
|
|
*
|
|
* AVB_SLOT_VERIFY_RESULT_ERROR_INVALID_ARGUMENT is returned if the
|
|
* caller passed invalid parameters, for example trying to use
|
|
* AVB_HASHTREE_ERROR_MODE_LOGGING without
|
|
* AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR.
|
|
*/
|
|
AvbSlotVerifyResult avb_slot_verify(AvbOps* ops,
|
|
const char* const* requested_partitions,
|
|
const char* ab_suffix,
|
|
AvbSlotVerifyFlags flags,
|
|
AvbHashtreeErrorMode hashtree_error_mode,
|
|
AvbSlotVerifyData** out_data);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* AVB_SLOT_VERIFY_H_ */
|