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The DM events present in the ima log contain various attributes in the key=value format. The attributes' names/values may change in future, and new attributes may also get added. The attestation server needs some versioning to determine which attributes are supported and are expected in the ima log. Add version information to the DM events present in the ima log to help attestation servers to correctly process the attributes across different versions. Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com> Suggested-by: Mimi Zohar <zohar@linux.ibm.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2021 Microsoft Corporation
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*
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* Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>
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*
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* File: dm-ima.h
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* Header file for device mapper IMA measurements.
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*/
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#ifndef DM_IMA_H
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#define DM_IMA_H
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#define DM_IMA_MEASUREMENT_BUF_LEN 4096
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#define DM_IMA_DEVICE_BUF_LEN 1024
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#define DM_IMA_TARGET_METADATA_BUF_LEN 128
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#define DM_IMA_TARGET_DATA_BUF_LEN 2048
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#define DM_IMA_DEVICE_CAPACITY_BUF_LEN 128
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#define DM_IMA_TABLE_HASH_ALG "sha256"
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#define __dm_ima_stringify(s) #s
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#define __dm_ima_str(s) __dm_ima_stringify(s)
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#define DM_IMA_VERSION_STR "dm_version=" \
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__dm_ima_str(DM_VERSION_MAJOR) "." \
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__dm_ima_str(DM_VERSION_MINOR) "." \
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__dm_ima_str(DM_VERSION_PATCHLEVEL) ";"
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#ifdef CONFIG_IMA
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struct dm_ima_device_table_metadata {
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/*
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* Contains data specific to the device which is common across
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* all the targets in the table (e.g. name, uuid, major, minor, etc).
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* The values are stored in comma separated list of key1=val1,key2=val2;
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* pairs delimited by a semicolon at the end of the list.
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*/
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char *device_metadata;
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unsigned int device_metadata_len;
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unsigned int num_targets;
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/*
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* Contains the sha256 hashes of the IMA measurements of the target
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* attributes' key-value pairs from the active/inactive tables.
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*/
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char *hash;
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unsigned int hash_len;
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};
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/*
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* This structure contains device metadata, and table hash for
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* active and inactive tables for ima measurements.
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*/
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struct dm_ima_measurements {
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struct dm_ima_device_table_metadata active_table;
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struct dm_ima_device_table_metadata inactive_table;
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unsigned int dm_version_str_len;
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};
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void dm_ima_reset_data(struct mapped_device *md);
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void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags);
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void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap);
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void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all);
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void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map);
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void dm_ima_measure_on_device_rename(struct mapped_device *md);
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#else
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static inline void dm_ima_reset_data(struct mapped_device *md) {}
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static inline void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags) {}
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static inline void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {}
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static inline void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) {}
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static inline void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map) {}
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static inline void dm_ima_measure_on_device_rename(struct mapped_device *md) {}
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#endif /* CONFIG_IMA */
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#endif /* DM_IMA_H */
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