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Linux/security/apparmor/include/context.h

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  1 /*
  2  * AppArmor security module
  3  *
  4  * This file contains AppArmor contexts used to associate "labels" to objects.
  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_CONTEXT_H
 16 #define __AA_CONTEXT_H
 17 
 18 #include <linux/cred.h>
 19 #include <linux/slab.h>
 20 #include <linux/sched.h>
 21 
 22 #include "policy.h"
 23 
 24 #define cred_cxt(X) (X)->security
 25 #define current_cxt() cred_cxt(current_cred())
 26 
 27 /* struct aa_file_cxt - the AppArmor context the file was opened in
 28  * @perms: the permission the file was opened with
 29  *
 30  * The file_cxt could currently be directly stored in file->f_security
 31  * as the profile reference is now stored in the f_cred.  However the
 32  * cxt struct will expand in the future so we keep the struct.
 33  */
 34 struct aa_file_cxt {
 35         u16 allow;
 36 };
 37 
 38 /**
 39  * aa_alloc_file_context - allocate file_cxt
 40  * @gfp: gfp flags for allocation
 41  *
 42  * Returns: file_cxt or NULL on failure
 43  */
 44 static inline struct aa_file_cxt *aa_alloc_file_context(gfp_t gfp)
 45 {
 46         return kzalloc(sizeof(struct aa_file_cxt), gfp);
 47 }
 48 
 49 /**
 50  * aa_free_file_context - free a file_cxt
 51  * @cxt: file_cxt to free  (MAYBE_NULL)
 52  */
 53 static inline void aa_free_file_context(struct aa_file_cxt *cxt)
 54 {
 55         if (cxt)
 56                 kzfree(cxt);
 57 }
 58 
 59 /**
 60  * struct aa_task_cxt - primary label for confined tasks
 61  * @profile: the current profile   (NOT NULL)
 62  * @exec: profile to transition to on next exec  (MAYBE NULL)
 63  * @previous: profile the task may return to     (MAYBE NULL)
 64  * @token: magic value the task must know for returning to @previous_profile
 65  *
 66  * Contains the task's current profile (which could change due to
 67  * change_hat).  Plus the hat_magic needed during change_hat.
 68  *
 69  * TODO: make so a task can be confined by a stack of contexts
 70  */
 71 struct aa_task_cxt {
 72         struct aa_profile *profile;
 73         struct aa_profile *onexec;
 74         struct aa_profile *previous;
 75         u64 token;
 76 };
 77 
 78 struct aa_task_cxt *aa_alloc_task_context(gfp_t flags);
 79 void aa_free_task_context(struct aa_task_cxt *cxt);
 80 void aa_dup_task_context(struct aa_task_cxt *new,
 81                          const struct aa_task_cxt *old);
 82 int aa_replace_current_profile(struct aa_profile *profile);
 83 int aa_set_current_onexec(struct aa_profile *profile);
 84 int aa_set_current_hat(struct aa_profile *profile, u64 token);
 85 int aa_restore_previous_profile(u64 cookie);
 86 struct aa_profile *aa_get_task_profile(struct task_struct *task);
 87 
 88 
 89 /**
 90  * aa_cred_profile - obtain cred's profiles
 91  * @cred: cred to obtain profiles from  (NOT NULL)
 92  *
 93  * Returns: confining profile
 94  *
 95  * does NOT increment reference count
 96  */
 97 static inline struct aa_profile *aa_cred_profile(const struct cred *cred)
 98 {
 99         struct aa_task_cxt *cxt = cred_cxt(cred);
100         BUG_ON(!cxt || !cxt->profile);
101         return cxt->profile;
102 }
103 
104 /**
105  * __aa_task_profile - retrieve another task's profile
106  * @task: task to query  (NOT NULL)
107  *
108  * Returns: @task's profile without incrementing its ref count
109  *
110  * If @task != current needs to be called in RCU safe critical section
111  */
112 static inline struct aa_profile *__aa_task_profile(struct task_struct *task)
113 {
114         return aa_cred_profile(__task_cred(task));
115 }
116 
117 /**
118  * __aa_task_is_confined - determine if @task has any confinement
119  * @task: task to check confinement of  (NOT NULL)
120  *
121  * If @task != current needs to be called in RCU safe critical section
122  */
123 static inline bool __aa_task_is_confined(struct task_struct *task)
124 {
125         return !unconfined(__aa_task_profile(task));
126 }
127 
128 /**
129  * __aa_current_profile - find the current tasks confining profile
130  *
131  * Returns: up to date confining profile or the ns unconfined profile (NOT NULL)
132  *
133  * This fn will not update the tasks cred to the most up to date version
134  * of the profile so it is safe to call when inside of locks.
135  */
136 static inline struct aa_profile *__aa_current_profile(void)
137 {
138         return aa_cred_profile(current_cred());
139 }
140 
141 /**
142  * aa_current_profile - find the current tasks confining profile and do updates
143  *
144  * Returns: up to date confining profile or the ns unconfined profile (NOT NULL)
145  *
146  * This fn will update the tasks cred structure if the profile has been
147  * replaced.  Not safe to call inside locks
148  */
149 static inline struct aa_profile *aa_current_profile(void)
150 {
151         const struct aa_task_cxt *cxt = current_cxt();
152         struct aa_profile *profile;
153         BUG_ON(!cxt || !cxt->profile);
154 
155         if (PROFILE_INVALID(cxt->profile)) {
156                 profile = aa_get_newest_profile(cxt->profile);
157                 aa_replace_current_profile(profile);
158                 aa_put_profile(profile);
159                 cxt = current_cxt();
160         }
161 
162         return cxt->profile;
163 }
164 
165 /**
166  * aa_clear_task_cxt_trans - clear transition tracking info from the cxt
167  * @cxt: task context to clear (NOT NULL)
168  */
169 static inline void aa_clear_task_cxt_trans(struct aa_task_cxt *cxt)
170 {
171         aa_put_profile(cxt->previous);
172         aa_put_profile(cxt->onexec);
173         cxt->previous = NULL;
174         cxt->onexec = NULL;
175         cxt->token = 0;
176 }
177 
178 #endif /* __AA_CONTEXT_H */
179 

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