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/*
* AppArmor security module
*
* This file contains AppArmor contexts used to associate "labels" to objects.
*
* Copyright (C) 1998-2008 Novell/SUSE
* Copyright 2009-2010 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*/
#ifndef __AA_CONTEXT_H
#define __AA_CONTEXT_H
#include <linux/cred.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include "policy.h"
#include "policy_ns.h"
#define cred_ctx(X) ((X)->security)
#define current_ctx() cred_ctx(current_cred())
/* struct aa_file_ctx - the AppArmor context the file was opened in
* @perms: the permission the file was opened with
*
* The file_ctx could currently be directly stored in file->f_security
* as the profile reference is now stored in the f_cred. However the
* ctx struct will expand in the future so we keep the struct.
*/
struct aa_file_ctx {
u16 allow;
};
/**
* aa_alloc_file_context - allocate file_ctx
* @gfp: gfp flags for allocation
*
* Returns: file_ctx or NULL on failure
*/
static inline struct aa_file_ctx *aa_alloc_file_context(gfp_t gfp)
{
return kzalloc(sizeof(struct aa_file_ctx), gfp);
}
/**
* aa_free_file_context - free a file_ctx
* @ctx: file_ctx to free (MAYBE_NULL)
*/
static inline void aa_free_file_context(struct aa_file_ctx *ctx)
{
if (ctx)
kzfree(ctx);
}
/**
* struct aa_task_ctx - primary label for confined tasks
* @profile: the current profile (NOT NULL)
* @exec: profile to transition to on next exec (MAYBE NULL)
* @previous: profile the task may return to (MAYBE NULL)
* @token: magic value the task must know for returning to @previous_profile
*
* Contains the task's current profile (which could change due to
* change_hat). Plus the hat_magic needed during change_hat.
*
* TODO: make so a task can be confined by a stack of contexts
*/
struct aa_task_ctx {
struct aa_profile *profile;
struct aa_profile *onexec;
struct aa_profile *previous;
u64 token;
};
struct aa_task_ctx *aa_alloc_task_context(gfp_t flags);
void aa_free_task_context(struct aa_task_ctx *ctx);
void aa_dup_task_context(struct aa_task_ctx *new,
const struct aa_task_ctx *old);
int aa_replace_current_profile(struct aa_profile *profile);
int aa_set_current_onexec(struct aa_profile *profile);
int aa_set_current_hat(struct aa_profile *profile, u64 token);
int aa_restore_previous_profile(u64 cookie);
struct aa_profile *aa_get_task_profile(struct task_struct *task);
/**
* aa_cred_profile - obtain cred's profiles
* @cred: cred to obtain profiles from (NOT NULL)
*
* Returns: confining profile
*
* does NOT increment reference count
*/
static inline struct aa_profile *aa_cred_profile(const struct cred *cred)
{
struct aa_task_ctx *ctx = cred_ctx(cred);
AA_BUG(!ctx || !ctx->profile);
return ctx->profile;
}
/**
* __aa_task_profile - retrieve another task's profile
* @task: task to query (NOT NULL)
*
* Returns: @task's profile without incrementing its ref count
*
* If @task != current needs to be called in RCU safe critical section
*/
static inline struct aa_profile *__aa_task_profile(struct task_struct *task)
{
return aa_cred_profile(__task_cred(task));
}
/**
* __aa_task_is_confined - determine if @task has any confinement
* @task: task to check confinement of (NOT NULL)
*
* If @task != current needs to be called in RCU safe critical section
*/
static inline bool __aa_task_is_confined(struct task_struct *task)
{
return !unconfined(__aa_task_profile(task));
}
/**
* __aa_current_profile - find the current tasks confining profile
*
* Returns: up to date confining profile or the ns unconfined profile (NOT NULL)
*
* This fn will not update the tasks cred to the most up to date version
* of the profile so it is safe to call when inside of locks.
*/
static inline struct aa_profile *__aa_current_profile(void)
{
return aa_cred_profile(current_cred());
}
/**
* aa_current_profile - find the current tasks confining profile and do updates
*
* Returns: up to date confining profile or the ns unconfined profile (NOT NULL)
*
* This fn will update the tasks cred structure if the profile has been
* replaced. Not safe to call inside locks
*/
static inline struct aa_profile *aa_current_profile(void)
{
const struct aa_task_ctx *ctx = current_ctx();
struct aa_profile *profile;
AA_BUG(!ctx || !ctx->profile);
if (profile_is_stale(ctx->profile)) {
profile = aa_get_newest_profile(ctx->profile);
aa_replace_current_profile(profile);
aa_put_profile(profile);
ctx = current_ctx();
}
return ctx->profile;
}
static inline struct aa_ns *aa_get_current_ns(void)
{
return aa_get_ns(__aa_current_profile()->ns);
}
/**
* aa_clear_task_ctx_trans - clear transition tracking info from the ctx
* @ctx: task context to clear (NOT NULL)
*/
static inline void aa_clear_task_ctx_trans(struct aa_task_ctx *ctx)
{
aa_put_profile(ctx->previous);
aa_put_profile(ctx->onexec);
ctx->previous = NULL;
ctx->onexec = NULL;
ctx->token = 0;
}
#endif /* __AA_CONTEXT_H */
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