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https://github.com/torvalds/linux
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90c436a64a
The cred is needed to properly audit some messages, and will be needed in the future for uid conditional mediation. So pass it through to where the apparmor_audit_data struct gets defined. Reviewed-by: Georgia Garcia <georgia.garcia@canonical.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* AppArmor security module
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*
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* This file contains AppArmor file mediation function definitions.
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*/
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#ifndef __AA_FILE_H
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#define __AA_FILE_H
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#include <linux/spinlock.h>
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#include "domain.h"
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#include "match.h"
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#include "perms.h"
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struct aa_policydb;
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struct aa_profile;
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struct path;
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#define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND))
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#define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\
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AA_MAY_CREATE | AA_MAY_DELETE | \
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AA_MAY_GETATTR | AA_MAY_SETATTR | \
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AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
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AA_EXEC_MMAP | AA_MAY_LINK)
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static inline struct aa_file_ctx *file_ctx(struct file *file)
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{
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return file->f_security + apparmor_blob_sizes.lbs_file;
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}
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/* struct aa_file_ctx - the AppArmor context the file was opened in
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* @lock: lock to update the ctx
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* @label: label currently cached on the ctx
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* @perms: the permission the file was opened with
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*/
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struct aa_file_ctx {
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spinlock_t lock;
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struct aa_label __rcu *label;
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u32 allow;
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};
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/*
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* The xindex is broken into 3 parts
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* - index - an index into either the exec name table or the variable table
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* - exec type - which determines how the executable name and index are used
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* - flags - which modify how the destination name is applied
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*/
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#define AA_X_INDEX_MASK AA_INDEX_MASK
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#define AA_X_TYPE_MASK 0x0c000000
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#define AA_X_NONE AA_INDEX_NONE
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#define AA_X_NAME 0x04000000 /* use executable name px */
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#define AA_X_TABLE 0x08000000 /* use a specified name ->n# */
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#define AA_X_UNSAFE 0x10000000
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#define AA_X_CHILD 0x20000000
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#define AA_X_INHERIT 0x40000000
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#define AA_X_UNCONFINED 0x80000000
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/* need to make conditional which ones are being set */
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struct path_cond {
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kuid_t uid;
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umode_t mode;
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};
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#define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill)
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int aa_audit_file(const struct cred *cred,
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struct aa_profile *profile, struct aa_perms *perms,
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const char *op, u32 request, const char *name,
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const char *target, struct aa_label *tlabel, kuid_t ouid,
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const char *info, int error);
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struct aa_perms *aa_lookup_fperms(struct aa_policydb *file_rules,
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aa_state_t state, struct path_cond *cond);
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aa_state_t aa_str_perms(struct aa_policydb *file_rules, aa_state_t start,
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const char *name, struct path_cond *cond,
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struct aa_perms *perms);
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int aa_path_perm(const char *op, const struct cred *subj_cred,
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struct aa_label *label, const struct path *path,
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int flags, u32 request, struct path_cond *cond);
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int aa_path_link(const struct cred *subj_cred, struct aa_label *label,
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struct dentry *old_dentry, const struct path *new_dir,
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struct dentry *new_dentry);
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int aa_file_perm(const char *op, const struct cred *subj_cred,
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struct aa_label *label, struct file *file,
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u32 request, bool in_atomic);
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void aa_inherit_files(const struct cred *cred, struct files_struct *files);
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/**
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* aa_map_file_perms - map file flags to AppArmor permissions
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* @file: open file to map flags to AppArmor permissions
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*
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* Returns: apparmor permission set for the file
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*/
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static inline u32 aa_map_file_to_perms(struct file *file)
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{
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int flags = file->f_flags;
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u32 perms = 0;
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if (file->f_mode & FMODE_WRITE)
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perms |= MAY_WRITE;
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if (file->f_mode & FMODE_READ)
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perms |= MAY_READ;
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if ((flags & O_APPEND) && (perms & MAY_WRITE))
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perms = (perms & ~MAY_WRITE) | MAY_APPEND;
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/* trunc implies write permission */
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if (flags & O_TRUNC)
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perms |= MAY_WRITE;
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if (flags & O_CREAT)
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perms |= AA_MAY_CREATE;
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return perms;
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}
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#endif /* __AA_FILE_H */
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