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authorJohn Johansen <john.johansen@canonical.com>2010-07-29 14:47:59 -0700
committerJames Morris <jmorris@namei.org>2010-08-02 15:35:12 +1000
commitc75afcd153f6147d3b094f45a1d87e5df7f4f053 (patch)
tree4d072c7b76a1e198427716f66a46712e508d4597 /security/apparmor/include/context.h
parent67012e8209df95a8290d135753ff5145431a666e (diff)
AppArmor: contexts used in attaching policy to system objects
AppArmor contexts attach profiles and state to tasks, files, etc. when a direct profile reference is not sufficient. Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/apparmor/include/context.h')
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diff --git a/security/apparmor/include/context.h b/security/apparmor/include/context.h
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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"
+
+/* struct aa_file_cxt - the AppArmor context the file was opened in
+ * @perms: the permission the file was opened with
+ *
+ * The file_cxt could currently be directly stored in file->f_security
+ * as the profile reference is now stored in the f_cred. However the
+ * cxt struct will expand in the future so we keep the struct.
+ */
+struct aa_file_cxt {
+ u16 allow;
+};
+
+/**
+ * aa_alloc_file_context - allocate file_cxt
+ * @gfp: gfp flags for allocation
+ *
+ * Returns: file_cxt or NULL on failure
+ */
+static inline struct aa_file_cxt *aa_alloc_file_context(gfp_t gfp)
+{
+ return kzalloc(sizeof(struct aa_file_cxt), gfp);
+}
+
+/**
+ * aa_free_file_context - free a file_cxt
+ * @cxt: file_cxt to free (MAYBE_NULL)
+ */
+static inline void aa_free_file_context(struct aa_file_cxt *cxt)
+{
+ if (cxt)
+ kzfree(cxt);
+}
+
+/**
+ * struct aa_task_cxt - 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_cxt {
+ struct aa_profile *profile;
+ struct aa_profile *onexec;
+ struct aa_profile *previous;
+ u64 token;
+};
+
+struct aa_task_cxt *aa_alloc_task_context(gfp_t flags);
+void aa_free_task_context(struct aa_task_cxt *cxt);
+void aa_dup_task_context(struct aa_task_cxt *new,
+ const struct aa_task_cxt *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);
+
+/**
+ * __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)
+{
+ struct aa_task_cxt *cxt = __task_cred(task)->security;
+
+ BUG_ON(!cxt || !cxt->profile);
+ if (unconfined(aa_newest_version(cxt->profile)))
+ return 0;
+
+ return 1;
+}
+
+/**
+ * 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_cxt *cxt = cred->security;
+ BUG_ON(!cxt || !cxt->profile);
+ return aa_newest_version(cxt->profile);
+}
+
+/**
+ * __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_cxt *cxt = current_cred()->security;
+ struct aa_profile *profile;
+ BUG_ON(!cxt || !cxt->profile);
+
+ profile = aa_newest_version(cxt->profile);
+ /*
+ * Whether or not replacement succeeds, use newest profile so
+ * there is no need to update it after replacement.
+ */
+ if (unlikely((cxt->profile != profile)))
+ aa_replace_current_profile(profile);
+
+ return profile;
+}
+
+#endif /* __AA_CONTEXT_H */

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