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+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor policy definitions.
+ *
+ * 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_POLICY_H
+#define __AA_POLICY_H
+
+#include <linux/capability.h>
+#include <linux/cred.h>
+#include <linux/kref.h>
+#include <linux/rhashtable.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+
+#include "apparmor.h"
+#include "audit.h"
+#include "capability.h"
+#include "domain.h"
+#include "file.h"
+#include "lib.h"
+#include "label.h"
+#include "net.h"
+#include "perms.h"
+#include "resource.h"
+
+
+struct aa_ns;
+
+extern int unprivileged_userns_apparmor_policy;
+
+extern const char *const aa_profile_mode_names[];
+#define APPARMOR_MODE_NAMES_MAX_INDEX 4
+
+#define PROFILE_MODE(_profile, _mode) \
+ ((aa_g_profile_mode == (_mode)) || \
+ ((_profile)->mode == (_mode)))
+
+#define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN)
+
+#define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)
+
+#define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT)
+
+#define profile_is_stale(_profile) (label_is_stale(&(_profile)->label))
+
+#define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
+
+/*
+ * FIXME: currently need a clean way to replace and remove profiles as a
+ * set. It should be done at the namespace level.
+ * Either, with a set of profiles loaded at the namespace level or via
+ * a mark and remove marked interface.
+ */
+enum profile_mode {
+ APPARMOR_ENFORCE, /* enforce access rules */
+ APPARMOR_COMPLAIN, /* allow and log access violations */
+ APPARMOR_KILL, /* kill task on access violation */
+ APPARMOR_UNCONFINED, /* profile set to unconfined */
+};
+
+
+/* struct aa_policydb - match engine for a policy
+ * dfa: dfa pattern match
+ * start: set of start states for the different classes of data
+ */
+struct aa_policydb {
+ /* Generic policy DFA specific rule types will be subsections of it */
+ struct aa_dfa *dfa;
+ unsigned int start[AA_CLASS_LAST + 1];
+
+};
+
+/* struct aa_data - generic data structure
+ * key: name for retrieving this data
+ * size: size of data in bytes
+ * data: binary data
+ * head: reserved for rhashtable
+ */
+struct aa_data {
+ char *key;
+ u32 size;
+ char *data;
+ struct rhash_head head;
+};
+
+
+/* struct aa_profile - basic confinement data
+ * @base - base components of the profile (name, refcount, lists, lock ...)
+ * @label - label this profile is an extension of
+ * @parent: parent of profile
+ * @ns: namespace the profile is in
+ * @rename: optional profile name that this profile renamed
+ * @attach: human readable attachment string
+ * @xmatch: optional extended matching for unconfined executables names
+ * @xmatch_len: xmatch prefix len, used to determine xmatch priority
+ * @audit: the auditing mode of the profile
+ * @mode: the enforcement mode of the profile
+ * @path_flags: flags controlling path generation behavior
+ * @disconnected: what to prepend if attach_disconnected is specified
+ * @size: the memory consumed by this profiles rules
+ * @policy: general match rules governing policy
+ * @file: The set of rules governing basic file access and domain transitions
+ * @caps: capabilities for the profile
+ * @rlimits: rlimits for the profile
+ *
+ * @dents: dentries for the profiles file entries in apparmorfs
+ * @dirname: name of the profile dir in apparmorfs
+ * @data: hashtable for free-form policy aa_data
+ *
+ * The AppArmor profile contains the basic confinement data. Each profile
+ * has a name, and exists in a namespace. The @name and @exec_match are
+ * used to determine profile attachment against unconfined tasks. All other
+ * attachments are determined by profile X transition rules.
+ *
+ * Profiles have a hierarchy where hats and children profiles keep
+ * a reference to their parent.
+ *
+ * Profile names can not begin with a : and can not contain the \0
+ * character. If a profile name begins with / it will be considered when
+ * determining profile attachment on "unconfined" tasks.
+ */
+struct aa_profile {
+ struct aa_policy base;
+ struct aa_profile __rcu *parent;
+
+ struct aa_ns *ns;
+ const char *rename;
+
+ const char *attach;
+ struct aa_dfa *xmatch;
+ int xmatch_len;
+ enum audit_mode audit;
+ long mode;
+ u32 path_flags;
+ const char *disconnected;
+ int size;
+
+ struct aa_policydb policy;
+ struct aa_file_rules file;
+ struct aa_caps caps;
+
+ int xattr_count;
+ char **xattrs;
+
+ struct aa_rlimit rlimits;
+
+ struct aa_loaddata *rawdata;
+ unsigned char *hash;
+ char *dirname;
+ struct dentry *dents[AAFS_PROF_SIZEOF];
+ struct rhashtable *data;
+ struct aa_label label;
+};
+
+extern enum profile_mode aa_g_profile_mode;
+
+#define AA_MAY_LOAD_POLICY AA_MAY_APPEND
+#define AA_MAY_REPLACE_POLICY AA_MAY_WRITE
+#define AA_MAY_REMOVE_POLICY AA_MAY_DELETE
+
+#define profiles_ns(P) ((P)->ns)
+#define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname)
+
+void aa_add_profile(struct aa_policy *common, struct aa_profile *profile);
+
+
+void aa_free_proxy_kref(struct kref *kref);
+struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy,
+ gfp_t gfp);
+struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat,
+ const char *base, gfp_t gfp);
+void aa_free_profile(struct aa_profile *profile);
+void aa_free_profile_kref(struct kref *kref);
+struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
+struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
+ size_t n);
+struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name);
+struct aa_profile *aa_fqlookupn_profile(struct aa_label *base,
+ const char *fqname, size_t n);
+struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name);
+
+ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label,
+ u32 mask, struct aa_loaddata *udata);
+ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label,
+ char *name, size_t size);
+void __aa_profile_list_release(struct list_head *head);
+
+#define PROF_ADD 1
+#define PROF_REPLACE 0
+
+#define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)
+
+/**
+ * aa_get_newest_profile - simple wrapper fn to wrap the label version
+ * @p: profile (NOT NULL)
+ *
+ * Returns refcount to newest version of the profile (maybe @p)
+ *
+ * Requires: @p must be held with a valid refcount
+ */
+static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
+{
+ return labels_profile(aa_get_newest_label(&p->label));
+}
+
+static inline unsigned int PROFILE_MEDIATES(struct aa_profile *profile,
+ unsigned char class)
+{
+ if (class <= AA_CLASS_LAST)
+ return profile->policy.start[class];
+ else
+ return aa_dfa_match_len(profile->policy.dfa,
+ profile->policy.start[0], &class, 1);
+}
+
+static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile,
+ u16 AF) {
+ unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
+ __be16 be_af = cpu_to_be16(AF);
+
+ if (!state)
+ return 0;
+ return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2);
+}
+
+/**
+ * aa_get_profile - increment refcount on profile @p
+ * @p: profile (MAYBE NULL)
+ *
+ * Returns: pointer to @p if @p is NULL will return NULL
+ * Requires: @p must be held with valid refcount when called
+ */
+static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
+{
+ if (p)
+ kref_get(&(p->label.count));
+
+ return p;
+}
+
+/**
+ * aa_get_profile_not0 - increment refcount on profile @p found via lookup
+ * @p: profile (MAYBE NULL)
+ *
+ * Returns: pointer to @p if @p is NULL will return NULL
+ * Requires: @p must be held with valid refcount when called
+ */
+static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p)
+{
+ if (p && kref_get_unless_zero(&p->label.count))
+ return p;
+
+ return NULL;
+}
+
+/**
+ * aa_get_profile_rcu - increment a refcount profile that can be replaced
+ * @p: pointer to profile that can be replaced (NOT NULL)
+ *
+ * Returns: pointer to a refcounted profile.
+ * else NULL if no profile
+ */
+static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
+{
+ struct aa_profile *c;
+
+ rcu_read_lock();
+ do {
+ c = rcu_dereference(*p);
+ } while (c && !kref_get_unless_zero(&c->label.count));
+ rcu_read_unlock();
+
+ return c;
+}
+
+/**
+ * aa_put_profile - decrement refcount on profile @p
+ * @p: profile (MAYBE NULL)
+ */
+static inline void aa_put_profile(struct aa_profile *p)
+{
+ if (p)
+ kref_put(&p->label.count, aa_label_kref);
+}
+
+static inline int AUDIT_MODE(struct aa_profile *profile)
+{
+ if (aa_g_audit != AUDIT_NORMAL)
+ return aa_g_audit;
+
+ return profile->audit;
+}
+
+bool policy_view_capable(struct aa_ns *ns);
+bool policy_admin_capable(struct aa_ns *ns);
+int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns,
+ u32 mask);
+
+#endif /* __AA_POLICY_H */