1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * AppArmor security module
4 *
5 * This file contains AppArmor basic permission sets definitions.
6 *
7 * Copyright 2017 Canonical Ltd.
8 */
9
10 #ifndef __AA_PERM_H
11 #define __AA_PERM_H
12
13 #include <linux/fs.h>
14 #include "label.h"
15
16 #define AA_MAY_EXEC MAY_EXEC
17 #define AA_MAY_WRITE MAY_WRITE
18 #define AA_MAY_READ MAY_READ
19 #define AA_MAY_APPEND MAY_APPEND
20
21 #define AA_MAY_CREATE 0x0010
22 #define AA_MAY_DELETE 0x0020
23 #define AA_MAY_OPEN 0x0040
24 #define AA_MAY_RENAME 0x0080 /* pair */
25
26 #define AA_MAY_SETATTR 0x0100 /* meta write */
27 #define AA_MAY_GETATTR 0x0200 /* meta read */
28 #define AA_MAY_SETCRED 0x0400 /* security cred/attr */
29 #define AA_MAY_GETCRED 0x0800
30
31 #define AA_MAY_CHMOD 0x1000 /* pair */
32 #define AA_MAY_CHOWN 0x2000 /* pair */
33 #define AA_MAY_CHGRP 0x4000 /* pair */
34 #define AA_MAY_LOCK 0x8000 /* LINK_SUBSET overlaid */
35
36 #define AA_EXEC_MMAP 0x00010000
37 #define AA_MAY_MPROT 0x00020000 /* extend conditions */
38 #define AA_MAY_LINK 0x00040000 /* pair */
39 #define AA_MAY_SNAPSHOT 0x00080000 /* pair */
40
41 #define AA_MAY_DELEGATE
42 #define AA_CONT_MATCH 0x08000000
43
44 #define AA_MAY_STACK 0x10000000
45 #define AA_MAY_ONEXEC 0x20000000 /* either stack or change_profile */
46 #define AA_MAY_CHANGE_PROFILE 0x40000000
47 #define AA_MAY_CHANGEHAT 0x80000000
48
49 #define AA_LINK_SUBSET AA_MAY_LOCK /* overlaid */
50
51
52 #define PERMS_CHRS_MASK (MAY_READ | MAY_WRITE | AA_MAY_CREATE | \
53 AA_MAY_DELETE | AA_MAY_LINK | AA_MAY_LOCK | \
54 AA_MAY_EXEC | AA_EXEC_MMAP | AA_MAY_APPEND)
55
56 #define PERMS_NAMES_MASK (PERMS_CHRS_MASK | AA_MAY_OPEN | AA_MAY_RENAME | \
57 AA_MAY_SETATTR | AA_MAY_GETATTR | AA_MAY_SETCRED | \
58 AA_MAY_GETCRED | AA_MAY_CHMOD | AA_MAY_CHOWN | \
59 AA_MAY_CHGRP | AA_MAY_MPROT | AA_MAY_SNAPSHOT | \
60 AA_MAY_STACK | AA_MAY_ONEXEC | \
61 AA_MAY_CHANGE_PROFILE | AA_MAY_CHANGEHAT)
62
63 extern const char aa_file_perm_chrs[];
64 extern const char *aa_file_perm_names[];
65
66 struct aa_perms {
67 u32 allow;
68 u32 deny; /* explicit deny, or conflict if allow also set */
69
70 u32 subtree; /* allow perm on full subtree only when allow is set */
71 u32 cond; /* set only when ~allow and ~deny */
72
73 u32 kill; /* set only when ~allow | deny */
74 u32 complain; /* accumulates only used when ~allow & ~deny */
75 u32 prompt; /* accumulates only used when ~allow & ~deny */
76
77 u32 audit; /* set only when allow is set */
78 u32 quiet; /* set only when ~allow | deny */
79 u32 hide; /* set only when ~allow | deny */
80
81
82 u32 xindex;
83 u32 tag; /* tag string index, if present */
84 u32 label; /* label string index, if present */
85 };
86
87 /*
88 * Indexes are broken into a 24 bit index and 8 bit flag.
89 * For the index to be valid there must be a value in the flag
90 */
91 #define AA_INDEX_MASK 0x00ffffff
92 #define AA_INDEX_FLAG_MASK 0xff000000
93 #define AA_INDEX_NONE 0
94
95 #define ALL_PERMS_MASK 0xffffffff
96 extern struct aa_perms nullperms;
97 extern struct aa_perms allperms;
98
99 /**
100 * aa_perms_accum_raw - accumulate perms with out masking off overlapping perms
101 * @accum - perms struct to accumulate into
102 * @addend - perms struct to add to @accum
103 */
aa_perms_accum_raw(struct aa_perms * accum,struct aa_perms * addend)104 static inline void aa_perms_accum_raw(struct aa_perms *accum,
105 struct aa_perms *addend)
106 {
107 accum->deny |= addend->deny;
108 accum->allow &= addend->allow & ~addend->deny;
109 accum->audit |= addend->audit & addend->allow;
110 accum->quiet &= addend->quiet & ~addend->allow;
111 accum->kill |= addend->kill & ~addend->allow;
112 accum->complain |= addend->complain & ~addend->allow & ~addend->deny;
113 accum->cond |= addend->cond & ~addend->allow & ~addend->deny;
114 accum->hide &= addend->hide & ~addend->allow;
115 accum->prompt |= addend->prompt & ~addend->allow & ~addend->deny;
116 accum->subtree |= addend->subtree & ~addend->deny;
117
118 if (!accum->xindex)
119 accum->xindex = addend->xindex;
120 if (!accum->tag)
121 accum->tag = addend->tag;
122 if (!accum->label)
123 accum->label = addend->label;
124 }
125
126 /**
127 * aa_perms_accum - accumulate perms, masking off overlapping perms
128 * @accum - perms struct to accumulate into
129 * @addend - perms struct to add to @accum
130 */
aa_perms_accum(struct aa_perms * accum,struct aa_perms * addend)131 static inline void aa_perms_accum(struct aa_perms *accum,
132 struct aa_perms *addend)
133 {
134 accum->deny |= addend->deny;
135 accum->allow &= addend->allow & ~accum->deny;
136 accum->audit |= addend->audit & accum->allow;
137 accum->quiet &= addend->quiet & ~accum->allow;
138 accum->kill |= addend->kill & ~accum->allow;
139 accum->complain |= addend->complain & ~accum->allow & ~accum->deny;
140 accum->cond |= addend->cond & ~accum->allow & ~accum->deny;
141 accum->hide &= addend->hide & ~accum->allow;
142 accum->prompt |= addend->prompt & ~accum->allow & ~accum->deny;
143 accum->subtree &= addend->subtree & ~accum->deny;
144
145 if (!accum->xindex)
146 accum->xindex = addend->xindex;
147 if (!accum->tag)
148 accum->tag = addend->tag;
149 if (!accum->label)
150 accum->label = addend->label;
151 }
152
153 #define xcheck(FN1, FN2) \
154 ({ \
155 int e, error = FN1; \
156 e = FN2; \
157 if (e) \
158 error = e; \
159 error; \
160 })
161
162
163 /*
164 * TODO: update for labels pointing to labels instead of profiles
165 * TODO: optimize the walk, currently does subwalk of L2 for each P in L1
166 * gah this doesn't allow for label compound check!!!!
167 */
168 #define xcheck_ns_profile_profile(P1, P2, FN, args...) \
169 ({ \
170 int ____e = 0; \
171 if (P1->ns == P2->ns) \
172 ____e = FN((P1), (P2), args); \
173 (____e); \
174 })
175
176 #define xcheck_ns_profile_label(P, L, FN, args...) \
177 ({ \
178 struct aa_profile *__p2; \
179 fn_for_each((L), __p2, \
180 xcheck_ns_profile_profile((P), __p2, (FN), args)); \
181 })
182
183 #define xcheck_ns_labels(L1, L2, FN, args...) \
184 ({ \
185 struct aa_profile *__p1; \
186 fn_for_each((L1), __p1, FN(__p1, (L2), args)); \
187 })
188
189 /* Do the cross check but applying FN at the profiles level */
190 #define xcheck_labels_profiles(L1, L2, FN, args...) \
191 xcheck_ns_labels((L1), (L2), xcheck_ns_profile_label, (FN), args)
192
193 #define xcheck_labels(L1, L2, P, FN1, FN2) \
194 xcheck(fn_for_each((L1), (P), (FN1)), fn_for_each((L2), (P), (FN2)))
195
196
197 extern struct aa_perms default_perms;
198
199
200 void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs,
201 u32 mask);
202 void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names,
203 u32 mask);
204 void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
205 u32 chrsmask, const char * const *names, u32 namesmask);
206 void aa_apply_modes_to_perms(struct aa_profile *profile,
207 struct aa_perms *perms);
208 void aa_perms_accum(struct aa_perms *accum, struct aa_perms *addend);
209 void aa_perms_accum_raw(struct aa_perms *accum, struct aa_perms *addend);
210 void aa_profile_match_label(struct aa_profile *profile,
211 struct aa_ruleset *rules, struct aa_label *label,
212 int type, u32 request, struct aa_perms *perms);
213 int aa_profile_label_perm(struct aa_profile *profile, struct aa_profile *target,
214 u32 request, int type, u32 *deny,
215 struct apparmor_audit_data *ad);
216 int aa_check_perms(struct aa_profile *profile, struct aa_perms *perms,
217 u32 request, struct apparmor_audit_data *ad,
218 void (*cb)(struct audit_buffer *, void *));
219 #endif /* __AA_PERM_H */
220