This source file includes following definitions.
- aa_alloc_file_ctx
- aa_free_file_ctx
- aa_get_file_label
- dfa_map_xindex
- aa_free_file_rules
- aa_map_file_to_perms
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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
20 struct aa_profile;
21 struct 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
31 static inline struct aa_file_ctx *file_ctx(struct file *file)
32 {
33 return file->f_security + apparmor_blob_sizes.lbs_file;
34 }
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40
41 struct aa_file_ctx {
42 spinlock_t lock;
43 struct aa_label __rcu *label;
44 u32 allow;
45 };
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53
54 static 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 }
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70
71 static 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
79 static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx)
80 {
81 return aa_get_label_rcu(&ctx->label);
82 }
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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
96 #define AA_X_TABLE 0x0800
97
98 #define AA_X_UNSAFE 0x1000
99 #define AA_X_CHILD 0x2000
100 #define AA_X_INHERIT 0x4000
101 #define AA_X_UNCONFINED 0x8000
102
103
104 struct 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
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113
114 static 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
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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
159 int 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);
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175 struct aa_file_rules {
176 unsigned int start;
177 struct aa_dfa *dfa;
178
179 struct aa_domain trans;
180
181 };
182
183 struct aa_perms aa_compute_fperms(struct aa_dfa *dfa, unsigned int state,
184 struct path_cond *cond);
185 unsigned 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
189 int __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);
192 int 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
196 int aa_path_link(struct aa_label *label, struct dentry *old_dentry,
197 const struct path *new_dir, struct dentry *new_dentry);
198
199 int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
200 u32 request);
201
202 void aa_inherit_files(const struct cred *cred, struct files_struct *files);
203
204 static 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 }
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215
216 static 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
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