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Linux/security/apparmor/include/file.h

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  1 /*
  2  * AppArmor security module
  3  *
  4  * This file contains AppArmor file mediation function definitions.
  5  *
  6  * Copyright (C) 1998-2008 Novell/SUSE
  7  * Copyright 2009-2010 Canonical Ltd.
  8  *
  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
 12  * License.
 13  */
 14 
 15 #ifndef __AA_FILE_H
 16 #define __AA_FILE_H
 17 
 18 #include "domain.h"
 19 #include "match.h"
 20 
 21 struct aa_profile;
 22 struct path;
 23 
 24 /*
 25  * We use MAY_EXEC, MAY_WRITE, MAY_READ, MAY_APPEND and the following flags
 26  * for profile permissions
 27  */
 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
 32 
 33 #define AA_MAY_CHMOD                   0x0100
 34 #define AA_MAY_CHOWN                   0x0200
 35 #define AA_MAY_LOCK                    0x0400
 36 #define AA_EXEC_MMAP                   0x0800
 37 
 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 */
 43 
 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)
 49 
 50 /*
 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
 55  */
 56 #define AA_X_INDEX_MASK         0x03ff
 57 
 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# */
 63 
 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
 68 
 69 /* AA_SECURE_X_NEEDED - is passed in the bprm->unsafe field */
 70 #define AA_SECURE_X_NEEDED      0x8000
 71 
 72 /* need to make conditional which ones are being set */
 73 struct path_cond {
 74         kuid_t uid;
 75         umode_t mode;
 76 };
 77 
 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
 84  *
 85  * The @audit and @queit mask should be mutually exclusive.
 86  */
 87 struct file_perms {
 88         u32 allow;
 89         u32 audit;
 90         u32 quiet;
 91         u32 kill;
 92         u16 xindex;
 93 };
 94 
 95 extern struct file_perms nullperms;
 96 
 97 #define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill)
 98 
 99 /* FIXME: split perms from dfa and match this to description
100  *        also add delegation info.
101  */
102 static inline u16 dfa_map_xindex(u16 mask)
103 {
104         u16 old_index = (mask >> 10) & 0xf;
105         u16 index = 0;
106 
107         if (mask & 0x100)
108                 index |= AA_X_UNSAFE;
109         if (mask & 0x200)
110                 index |= AA_X_INHERIT;
111         if (mask & 0x80)
112                 index |= AA_X_UNCONFINED;
113 
114         if (old_index == 1) {
115                 index |= AA_X_UNCONFINED;
116         } else if (old_index == 2) {
117                 index |= AA_X_NAME;
118         } else if (old_index == 3) {
119                 index |= AA_X_NAME | AA_X_CHILD;
120         } else if (old_index) {
121                 index |= AA_X_TABLE;
122                 index |= old_index - 4;
123         }
124 
125         return index;
126 }
127 
128 /*
129  * map old dfa inline permissions to new format
130  */
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))
137 
138 #define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \
139                                       0x7f) |                           \
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)
146 
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);
150 
151 /**
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
156  *
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.
161  */
162 struct aa_file_rules {
163         unsigned int start;
164         struct aa_dfa *dfa;
165         /* struct perms perms; */
166         struct aa_domain trans;
167         /* TODO: add delegate table */
168 };
169 
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);
173 
174 int aa_path_perm(int op, struct aa_profile *profile, struct path *path,
175                  int flags, u32 request, struct path_cond *cond);
176 
177 int aa_path_link(struct aa_profile *profile, struct dentry *old_dentry,
178                  struct path *new_dir, struct dentry *new_dentry);
179 
180 int aa_file_perm(int op, struct aa_profile *profile, struct file *file,
181                  u32 request);
182 
183 static inline void aa_free_file_rules(struct aa_file_rules *rules)
184 {
185         aa_put_dfa(rules->dfa);
186         aa_free_domain_entries(&rules->trans);
187 }
188 
189 /**
190  * aa_map_file_perms - map file flags to AppArmor permissions
191  * @file: open file to map flags to AppArmor permissions
192  *
193  * Returns: apparmor permission set for the file
194  */
195 static inline u32 aa_map_file_to_perms(struct file *file)
196 {
197         int flags = file->f_flags;
198         u32 perms = 0;
199 
200         if (file->f_mode & FMODE_WRITE)
201                 perms |= MAY_WRITE;
202         if (file->f_mode & FMODE_READ)
203                 perms |= MAY_READ;
204 
205         if ((flags & O_APPEND) && (perms & MAY_WRITE))
206                 perms = (perms & ~MAY_WRITE) | MAY_APPEND;
207         /* trunc implies write permission */
208         if (flags & O_TRUNC)
209                 perms |= MAY_WRITE;
210         if (flags & O_CREAT)
211                 perms |= AA_MAY_CREATE;
212 
213         return perms;
214 }
215 
216 #endif /* __AA_FILE_H */
217 

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