Loading...
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor file mediation function definitions.
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
9 */
10
11#ifndef __AA_FILE_H
12#define __AA_FILE_H
13
14#include <linux/spinlock.h>
15
16#include "domain.h"
17#include "match.h"
18#include "perms.h"
19
20struct aa_profile;
21struct path;
22
23#define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND))
24
25#define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\
26 AA_MAY_CREATE | AA_MAY_DELETE | \
27 AA_MAY_GETATTR | AA_MAY_SETATTR | \
28 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
29 AA_EXEC_MMAP | AA_MAY_LINK)
30
31static inline struct aa_file_ctx *file_ctx(struct file *file)
32{
33 return file->f_security + apparmor_blob_sizes.lbs_file;
34}
35
36/* struct aa_file_ctx - the AppArmor context the file was opened in
37 * @lock: lock to update the ctx
38 * @label: label currently cached on the ctx
39 * @perms: the permission the file was opened with
40 */
41struct aa_file_ctx {
42 spinlock_t lock;
43 struct aa_label __rcu *label;
44 u32 allow;
45};
46
47/**
48 * aa_alloc_file_ctx - allocate file_ctx
49 * @label: initial label of task creating the file
50 * @gfp: gfp flags for allocation
51 *
52 * Returns: file_ctx or NULL on failure
53 */
54static inline struct aa_file_ctx *aa_alloc_file_ctx(struct aa_label *label,
55 gfp_t gfp)
56{
57 struct aa_file_ctx *ctx;
58
59 ctx = kzalloc(sizeof(struct aa_file_ctx), gfp);
60 if (ctx) {
61 spin_lock_init(&ctx->lock);
62 rcu_assign_pointer(ctx->label, aa_get_label(label));
63 }
64 return ctx;
65}
66
67/**
68 * aa_free_file_ctx - free a file_ctx
69 * @ctx: file_ctx to free (MAYBE_NULL)
70 */
71static inline void aa_free_file_ctx(struct aa_file_ctx *ctx)
72{
73 if (ctx) {
74 aa_put_label(rcu_access_pointer(ctx->label));
75 kzfree(ctx);
76 }
77}
78
79static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx)
80{
81 return aa_get_label_rcu(&ctx->label);
82}
83
84/*
85 * The xindex is broken into 3 parts
86 * - index - an index into either the exec name table or the variable table
87 * - exec type - which determines how the executable name and index are used
88 * - flags - which modify how the destination name is applied
89 */
90#define AA_X_INDEX_MASK 0x03ff
91
92#define AA_X_TYPE_MASK 0x0c00
93#define AA_X_TYPE_SHIFT 10
94#define AA_X_NONE 0x0000
95#define AA_X_NAME 0x0400 /* use executable name px */
96#define AA_X_TABLE 0x0800 /* use a specified name ->n# */
97
98#define AA_X_UNSAFE 0x1000
99#define AA_X_CHILD 0x2000 /* make >AA_X_NONE apply to children */
100#define AA_X_INHERIT 0x4000
101#define AA_X_UNCONFINED 0x8000
102
103/* need to make conditional which ones are being set */
104struct path_cond {
105 kuid_t uid;
106 umode_t mode;
107};
108
109#define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill)
110
111/* FIXME: split perms from dfa and match this to description
112 * also add delegation info.
113 */
114static inline u16 dfa_map_xindex(u16 mask)
115{
116 u16 old_index = (mask >> 10) & 0xf;
117 u16 index = 0;
118
119 if (mask & 0x100)
120 index |= AA_X_UNSAFE;
121 if (mask & 0x200)
122 index |= AA_X_INHERIT;
123 if (mask & 0x80)
124 index |= AA_X_UNCONFINED;
125
126 if (old_index == 1) {
127 index |= AA_X_UNCONFINED;
128 } else if (old_index == 2) {
129 index |= AA_X_NAME;
130 } else if (old_index == 3) {
131 index |= AA_X_NAME | AA_X_CHILD;
132 } else if (old_index) {
133 index |= AA_X_TABLE;
134 index |= old_index - 4;
135 }
136
137 return index;
138}
139
140/*
141 * map old dfa inline permissions to new format
142 */
143#define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) | \
144 ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
145#define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f)
146#define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f)
147#define dfa_user_xindex(dfa, state) \
148 (dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff))
149
150#define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \
151 0x7f) | \
152 ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
153#define dfa_other_audit(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 14) & 0x7f)
154#define dfa_other_quiet(dfa, state) \
155 ((((ACCEPT_TABLE2(dfa)[state]) >> 7) >> 14) & 0x7f)
156#define dfa_other_xindex(dfa, state) \
157 dfa_map_xindex((ACCEPT_TABLE(dfa)[state] >> 14) & 0x3fff)
158
159int aa_audit_file(struct aa_profile *profile, struct aa_perms *perms,
160 const char *op, u32 request, const char *name,
161 const char *target, struct aa_label *tlabel, kuid_t ouid,
162 const char *info, int error);
163
164/**
165 * struct aa_file_rules - components used for file rule permissions
166 * @dfa: dfa to match path names and conditionals against
167 * @perms: permission table indexed by the matched state accept entry of @dfa
168 * @trans: transition table for indexed by named x transitions
169 *
170 * File permission are determined by matching a path against @dfa and then
171 * then using the value of the accept entry for the matching state as
172 * an index into @perms. If a named exec transition is required it is
173 * looked up in the transition table.
174 */
175struct aa_file_rules {
176 unsigned int start;
177 struct aa_dfa *dfa;
178 /* struct perms perms; */
179 struct aa_domain trans;
180 /* TODO: add delegate table */
181};
182
183struct aa_perms aa_compute_fperms(struct aa_dfa *dfa, unsigned int state,
184 struct path_cond *cond);
185unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,
186 const char *name, struct path_cond *cond,
187 struct aa_perms *perms);
188
189int __aa_path_perm(const char *op, struct aa_profile *profile,
190 const char *name, u32 request, struct path_cond *cond,
191 int flags, struct aa_perms *perms);
192int aa_path_perm(const char *op, struct aa_label *label,
193 const struct path *path, int flags, u32 request,
194 struct path_cond *cond);
195
196int aa_path_link(struct aa_label *label, struct dentry *old_dentry,
197 const struct path *new_dir, struct dentry *new_dentry);
198
199int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
200 u32 request);
201
202void aa_inherit_files(const struct cred *cred, struct files_struct *files);
203
204static inline void aa_free_file_rules(struct aa_file_rules *rules)
205{
206 aa_put_dfa(rules->dfa);
207 aa_free_domain_entries(&rules->trans);
208}
209
210/**
211 * aa_map_file_perms - map file flags to AppArmor permissions
212 * @file: open file to map flags to AppArmor permissions
213 *
214 * Returns: apparmor permission set for the file
215 */
216static inline u32 aa_map_file_to_perms(struct file *file)
217{
218 int flags = file->f_flags;
219 u32 perms = 0;
220
221 if (file->f_mode & FMODE_WRITE)
222 perms |= MAY_WRITE;
223 if (file->f_mode & FMODE_READ)
224 perms |= MAY_READ;
225
226 if ((flags & O_APPEND) && (perms & MAY_WRITE))
227 perms = (perms & ~MAY_WRITE) | MAY_APPEND;
228 /* trunc implies write permission */
229 if (flags & O_TRUNC)
230 perms |= MAY_WRITE;
231 if (flags & O_CREAT)
232 perms |= AA_MAY_CREATE;
233
234 return perms;
235}
236
237#endif /* __AA_FILE_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor file mediation function definitions.
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
9 */
10
11#ifndef __AA_FILE_H
12#define __AA_FILE_H
13
14#include <linux/spinlock.h>
15
16#include "domain.h"
17#include "match.h"
18#include "perms.h"
19
20struct aa_policydb;
21struct aa_profile;
22struct path;
23
24#define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND))
25
26#define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\
27 AA_MAY_CREATE | AA_MAY_DELETE | \
28 AA_MAY_GETATTR | AA_MAY_SETATTR | \
29 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
30 AA_EXEC_MMAP | AA_MAY_LINK)
31
32static inline struct aa_file_ctx *file_ctx(struct file *file)
33{
34 return file->f_security + apparmor_blob_sizes.lbs_file;
35}
36
37/* struct aa_file_ctx - the AppArmor context the file was opened in
38 * @lock: lock to update the ctx
39 * @label: label currently cached on the ctx
40 * @perms: the permission the file was opened with
41 */
42struct aa_file_ctx {
43 spinlock_t lock;
44 struct aa_label __rcu *label;
45 u32 allow;
46};
47
48/**
49 * aa_alloc_file_ctx - allocate file_ctx
50 * @label: initial label of task creating the file
51 * @gfp: gfp flags for allocation
52 *
53 * Returns: file_ctx or NULL on failure
54 */
55static inline struct aa_file_ctx *aa_alloc_file_ctx(struct aa_label *label,
56 gfp_t gfp)
57{
58 struct aa_file_ctx *ctx;
59
60 ctx = kzalloc(sizeof(struct aa_file_ctx), gfp);
61 if (ctx) {
62 spin_lock_init(&ctx->lock);
63 rcu_assign_pointer(ctx->label, aa_get_label(label));
64 }
65 return ctx;
66}
67
68/**
69 * aa_free_file_ctx - free a file_ctx
70 * @ctx: file_ctx to free (MAYBE_NULL)
71 */
72static inline void aa_free_file_ctx(struct aa_file_ctx *ctx)
73{
74 if (ctx) {
75 aa_put_label(rcu_access_pointer(ctx->label));
76 kfree_sensitive(ctx);
77 }
78}
79
80static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx)
81{
82 return aa_get_label_rcu(&ctx->label);
83}
84
85/*
86 * The xindex is broken into 3 parts
87 * - index - an index into either the exec name table or the variable table
88 * - exec type - which determines how the executable name and index are used
89 * - flags - which modify how the destination name is applied
90 */
91#define AA_X_INDEX_MASK AA_INDEX_MASK
92
93#define AA_X_TYPE_MASK 0x0c000000
94#define AA_X_NONE AA_INDEX_NONE
95#define AA_X_NAME 0x04000000 /* use executable name px */
96#define AA_X_TABLE 0x08000000 /* use a specified name ->n# */
97
98#define AA_X_UNSAFE 0x10000000
99#define AA_X_CHILD 0x20000000
100#define AA_X_INHERIT 0x40000000
101#define AA_X_UNCONFINED 0x80000000
102
103/* need to make conditional which ones are being set */
104struct path_cond {
105 kuid_t uid;
106 umode_t mode;
107};
108
109#define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill)
110
111int aa_audit_file(struct aa_profile *profile, struct aa_perms *perms,
112 const char *op, u32 request, const char *name,
113 const char *target, struct aa_label *tlabel, kuid_t ouid,
114 const char *info, int error);
115
116struct aa_perms *aa_lookup_fperms(struct aa_policydb *file_rules,
117 aa_state_t state, struct path_cond *cond);
118aa_state_t aa_str_perms(struct aa_policydb *file_rules, aa_state_t start,
119 const char *name, struct path_cond *cond,
120 struct aa_perms *perms);
121
122int aa_path_perm(const char *op, struct aa_label *label,
123 const struct path *path, int flags, u32 request,
124 struct path_cond *cond);
125
126int aa_path_link(struct aa_label *label, struct dentry *old_dentry,
127 const struct path *new_dir, struct dentry *new_dentry);
128
129int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
130 u32 request, bool in_atomic);
131
132void aa_inherit_files(const struct cred *cred, struct files_struct *files);
133
134
135/**
136 * aa_map_file_perms - map file flags to AppArmor permissions
137 * @file: open file to map flags to AppArmor permissions
138 *
139 * Returns: apparmor permission set for the file
140 */
141static inline u32 aa_map_file_to_perms(struct file *file)
142{
143 int flags = file->f_flags;
144 u32 perms = 0;
145
146 if (file->f_mode & FMODE_WRITE)
147 perms |= MAY_WRITE;
148 if (file->f_mode & FMODE_READ)
149 perms |= MAY_READ;
150
151 if ((flags & O_APPEND) && (perms & MAY_WRITE))
152 perms = (perms & ~MAY_WRITE) | MAY_APPEND;
153 /* trunc implies write permission */
154 if (flags & O_TRUNC)
155 perms |= MAY_WRITE;
156 if (flags & O_CREAT)
157 perms |= AA_MAY_CREATE;
158
159 return perms;
160}
161
162#endif /* __AA_FILE_H */