50b977481f
The EVM signature includes the inode number and (optionally) the filesystem UUID, making it impractical to ship EVM signatures in packages. This patch adds a new portable format intended to allow distributions to include EVM signatures. It is identical to the existing format but hardcodes the inode and generation numbers to 0 and does not include the filesystem UUID even if the kernel is configured to do so. Removing the inode means that the metadata and signature from one file could be copied to another file without invalidating it. This is avoided by ensuring that an IMA xattr is present during EVM validation. Portable signatures are intended to be immutable - ie, they will never be transformed into HMACs. Based on earlier work by Dmitry Kasatkin and Mikhail Kurinnoi. Signed-off-by: Matthew Garrett <mjg59@google.com> Cc: Dmitry Kasatkin <dmitry.kasatkin@huawei.com> Cc: Mikhail Kurinnoi <viewizard@viewizard.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
48 lines
1 KiB
C
48 lines
1 KiB
C
/*
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* Copyright (C) 2009 IBM Corporation
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* Author: Mimi Zohar <zohar@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*/
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#ifndef _LINUX_INTEGRITY_H
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#define _LINUX_INTEGRITY_H
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#include <linux/fs.h>
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enum integrity_status {
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INTEGRITY_PASS = 0,
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INTEGRITY_PASS_IMMUTABLE,
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INTEGRITY_FAIL,
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INTEGRITY_NOLABEL,
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INTEGRITY_NOXATTRS,
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INTEGRITY_UNKNOWN,
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};
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/* List of EVM protected security xattrs */
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#ifdef CONFIG_INTEGRITY
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extern struct integrity_iint_cache *integrity_inode_get(struct inode *inode);
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extern void integrity_inode_free(struct inode *inode);
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extern void __init integrity_load_keys(void);
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#else
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static inline struct integrity_iint_cache *
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integrity_inode_get(struct inode *inode)
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{
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return NULL;
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}
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static inline void integrity_inode_free(struct inode *inode)
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{
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return;
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}
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static inline void integrity_load_keys(void)
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{
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}
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#endif /* CONFIG_INTEGRITY */
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#endif /* _LINUX_INTEGRITY_H */
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