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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>
71 lines
1.6 KiB
C
71 lines
1.6 KiB
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_EVAL_H
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#define _IPE_EVAL_H
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#include <linux/file.h>
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#include <linux/types.h>
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#include "policy.h"
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#include "hooks.h"
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#define IPE_EVAL_CTX_INIT ((struct ipe_eval_ctx){ 0 })
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extern struct ipe_policy __rcu *ipe_active_policy;
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extern bool success_audit;
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extern bool enforce;
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struct ipe_superblock {
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bool initramfs;
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};
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#ifdef CONFIG_IPE_PROP_DM_VERITY
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struct ipe_bdev {
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#ifdef CONFIG_IPE_PROP_DM_VERITY_SIGNATURE
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bool dm_verity_signed;
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#endif /* CONFIG_IPE_PROP_DM_VERITY_SIGNATURE */
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struct digest_info *root_hash;
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};
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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 {
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bool fs_verity_signed;
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};
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#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
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struct ipe_eval_ctx {
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enum ipe_op_type op;
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enum ipe_hook_type hook;
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const struct file *file;
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bool initramfs;
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#ifdef CONFIG_IPE_PROP_DM_VERITY
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const struct ipe_bdev *ipe_bdev;
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#endif /* CONFIG_IPE_PROP_DM_VERITY */
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#ifdef CONFIG_IPE_PROP_FS_VERITY
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const struct inode *ino;
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#endif /* CONFIG_IPE_PROP_FS_VERITY */
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#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
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const struct ipe_inode *ipe_inode;
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#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
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};
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enum ipe_match {
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IPE_MATCH_RULE = 0,
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IPE_MATCH_TABLE,
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IPE_MATCH_GLOBAL,
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__IPE_MATCH_MAX
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};
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void ipe_build_eval_ctx(struct ipe_eval_ctx *ctx,
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const struct file *file,
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enum ipe_op_type op,
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enum ipe_hook_type hook);
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int ipe_evaluate_event(const struct ipe_eval_ctx *const ctx);
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#endif /* _IPE_EVAL_H */
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