2 * AppArmor security module
4 * This file contains AppArmor file mediation function definitions.
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
25 * We use MAY_EXEC, MAY_WRITE, MAY_READ, MAY_APPEND and the following flags
26 * for profile permissions
28 #define AA_MAY_CREATE 0x0010
29 #define AA_MAY_DELETE 0x0020
30 #define AA_MAY_META_WRITE 0x0040
31 #define AA_MAY_META_READ 0x0080
33 #define AA_MAY_CHMOD 0x0100
34 #define AA_MAY_CHOWN 0x0200
35 #define AA_MAY_LOCK 0x0400
36 #define AA_EXEC_MMAP 0x0800
38 #define AA_MAY_LINK 0x1000
39 #define AA_LINK_SUBSET AA_MAY_LOCK /* overlaid */
40 #define AA_MAY_ONEXEC 0x40000000 /* exec allows onexec */
41 #define AA_MAY_CHANGE_PROFILE 0x80000000
42 #define AA_MAY_CHANGEHAT 0x80000000 /* ctrl auditing only */
44 #define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\
45 AA_MAY_CREATE | AA_MAY_DELETE | \
46 AA_MAY_META_READ | AA_MAY_META_WRITE | \
47 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
48 AA_EXEC_MMAP | AA_MAY_LINK)
51 * The xindex is broken into 3 parts
52 * - index - an index into either the exec name table or the variable table
53 * - exec type - which determines how the executable name and index are used
54 * - flags - which modify how the destination name is applied
56 #define AA_X_INDEX_MASK 0x03ff
58 #define AA_X_TYPE_MASK 0x0c00
59 #define AA_X_TYPE_SHIFT 10
60 #define AA_X_NONE 0x0000
61 #define AA_X_NAME 0x0400 /* use executable name px */
62 #define AA_X_TABLE 0x0800 /* use a specified name ->n# */
64 #define AA_X_UNSAFE 0x1000
65 #define AA_X_CHILD 0x2000 /* make >AA_X_NONE apply to children */
66 #define AA_X_INHERIT 0x4000
67 #define AA_X_UNCONFINED 0x8000
69 /* AA_SECURE_X_NEEDED - is passed in the bprm->unsafe field */
70 #define AA_SECURE_X_NEEDED 0x8000
72 /* need to make conditional which ones are being set */
78 /* struct file_perms - file permission
79 * @allow: mask of permissions that are allowed
80 * @audit: mask of permissions to force an audit message for
81 * @quiet: mask of permissions to quiet audit messages for
82 * @kill: mask of permissions that when matched will kill the task
83 * @xindex: exec transition index if @allow contains MAY_EXEC
85 * The @audit and @queit mask should be mutually exclusive.
95 extern struct file_perms nullperms
;
97 #define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill)
99 /* FIXME: split perms from dfa and match this to description
100 * also add delegation info.
102 static inline u16
dfa_map_xindex(u16 mask
)
104 u16 old_index
= (mask
>> 10) & 0xf;
108 index
|= AA_X_UNSAFE
;
110 index
|= AA_X_INHERIT
;
112 index
|= AA_X_UNCONFINED
;
114 if (old_index
== 1) {
115 index
|= AA_X_UNCONFINED
;
116 } else if (old_index
== 2) {
118 } else if (old_index
== 3) {
119 index
|= AA_X_NAME
| AA_X_CHILD
;
120 } else if (old_index
) {
122 index
|= old_index
- 4;
129 * map old dfa inline permissions to new format
131 #define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) | \
132 ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
133 #define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f)
134 #define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f)
135 #define dfa_user_xindex(dfa, state) \
136 (dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff))
138 #define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \
140 ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
141 #define dfa_other_audit(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 14) & 0x7f)
142 #define dfa_other_quiet(dfa, state) \
143 ((((ACCEPT_TABLE2(dfa)[state]) >> 7) >> 14) & 0x7f)
144 #define dfa_other_xindex(dfa, state) \
145 dfa_map_xindex((ACCEPT_TABLE(dfa)[state] >> 14) & 0x3fff)
147 int aa_audit_file(struct aa_profile
*profile
, struct file_perms
*perms
,
148 gfp_t gfp
, int op
, u32 request
, const char *name
,
149 const char *target
, kuid_t ouid
, const char *info
, int error
);
152 * struct aa_file_rules - components used for file rule permissions
153 * @dfa: dfa to match path names and conditionals against
154 * @perms: permission table indexed by the matched state accept entry of @dfa
155 * @trans: transition table for indexed by named x transitions
157 * File permission are determined by matching a path against @dfa and then
158 * then using the value of the accept entry for the matching state as
159 * an index into @perms. If a named exec transition is required it is
160 * looked up in the transition table.
162 struct aa_file_rules
{
165 /* struct perms perms; */
166 struct aa_domain trans
;
167 /* TODO: add delegate table */
170 unsigned int aa_str_perms(struct aa_dfa
*dfa
, unsigned int start
,
171 const char *name
, struct path_cond
*cond
,
172 struct file_perms
*perms
);
174 int aa_path_perm(int op
, struct aa_profile
*profile
, struct path
*path
,
175 int flags
, u32 request
, struct path_cond
*cond
);
177 int aa_path_link(struct aa_profile
*profile
, struct dentry
*old_dentry
,
178 struct path
*new_dir
, struct dentry
*new_dentry
);
180 int aa_file_perm(int op
, struct aa_profile
*profile
, struct file
*file
,
183 static inline void aa_free_file_rules(struct aa_file_rules
*rules
)
185 aa_put_dfa(rules
->dfa
);
186 aa_free_domain_entries(&rules
->trans
);
190 * aa_map_file_perms - map file flags to AppArmor permissions
191 * @file: open file to map flags to AppArmor permissions
193 * Returns: apparmor permission set for the file
195 static inline u32
aa_map_file_to_perms(struct file
*file
)
197 int flags
= file
->f_flags
;
200 if (file
->f_mode
& FMODE_WRITE
)
202 if (file
->f_mode
& FMODE_READ
)
205 if ((flags
& O_APPEND
) && (perms
& MAY_WRITE
))
206 perms
= (perms
& ~MAY_WRITE
) | MAY_APPEND
;
207 /* trunc implies write permission */
211 perms
|= AA_MAY_CREATE
;
216 #endif /* __AA_FILE_H */
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