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31f8c8682f
Enable IPE policy authors to indicate trust for a singular fsverity file, identified by the digest information, through "fsverity_digest" and all files using valid fsverity builtin signatures via "fsverity_signature". This enables file-level integrity claims to be expressed in IPE, allowing individual files to be authorized, giving some flexibility for policy authors. Such file-level claims are important to be expressed for enforcing the integrity of packages, as well as address some of the scalability issues in a sole dm-verity based solution (# of loop back devices, etc). This solution cannot be done in userspace as the minimum threat that IPE should mitigate is an attacker downloads malicious payload with all required dependencies. These dependencies can lack the userspace check, bypassing the protection entirely. A similar attack succeeds if the userspace component is replaced with a version that does not perform the check. As a result, this can only be done in the common entry point - the kernel. Signed-off-by: Deven Bowers <deven.desai@linux.microsoft.com> Signed-off-by: Fan Wu <wufan@linux.microsoft.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
27 lines
630 B
C
27 lines
630 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved.
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*/
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#ifndef _IPE_H
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#define _IPE_H
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#ifdef pr_fmt
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#undef pr_fmt
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#endif
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#define pr_fmt(fmt) "ipe: " fmt
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#include <linux/lsm_hooks.h>
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struct ipe_superblock *ipe_sb(const struct super_block *sb);
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extern bool ipe_enabled;
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#ifdef CONFIG_IPE_PROP_DM_VERITY
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struct ipe_bdev *ipe_bdev(struct block_device *b);
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#endif /* CONFIG_IPE_PROP_DM_VERITY */
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#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
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struct ipe_inode *ipe_inode(const struct inode *inode);
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#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
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#endif /* _IPE_H */
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