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309 lines
8.6 KiB
309 lines
8.6 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* AppArmor security module |
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* |
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* This file contains AppArmor policy definitions. |
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* |
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* Copyright (C) 1998-2008 Novell/SUSE |
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* Copyright 2009-2010 Canonical Ltd. |
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*/ |
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#ifndef __AA_POLICY_H |
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#define __AA_POLICY_H |
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#include <linux/capability.h> |
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#include <linux/cred.h> |
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#include <linux/kref.h> |
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#include <linux/rhashtable.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/socket.h> |
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#include "apparmor.h" |
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#include "audit.h" |
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#include "capability.h" |
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#include "domain.h" |
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#include "file.h" |
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#include "lib.h" |
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#include "label.h" |
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#include "net.h" |
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#include "perms.h" |
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#include "resource.h" |
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struct aa_ns; |
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extern int unprivileged_userns_apparmor_policy; |
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extern const char *const aa_profile_mode_names[]; |
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#define APPARMOR_MODE_NAMES_MAX_INDEX 4 |
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#define PROFILE_MODE(_profile, _mode) \ |
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((aa_g_profile_mode == (_mode)) || \ |
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((_profile)->mode == (_mode))) |
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#define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN) |
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#define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL) |
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#define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT) |
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#define profile_is_stale(_profile) (label_is_stale(&(_profile)->label)) |
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#define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2) |
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/* |
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* FIXME: currently need a clean way to replace and remove profiles as a |
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* set. It should be done at the namespace level. |
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* Either, with a set of profiles loaded at the namespace level or via |
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* a mark and remove marked interface. |
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*/ |
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enum profile_mode { |
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APPARMOR_ENFORCE, /* enforce access rules */ |
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APPARMOR_COMPLAIN, /* allow and log access violations */ |
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APPARMOR_KILL, /* kill task on access violation */ |
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APPARMOR_UNCONFINED, /* profile set to unconfined */ |
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}; |
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/* struct aa_policydb - match engine for a policy |
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* dfa: dfa pattern match |
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* start: set of start states for the different classes of data |
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*/ |
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struct aa_policydb { |
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/* Generic policy DFA specific rule types will be subsections of it */ |
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struct aa_dfa *dfa; |
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unsigned int start[AA_CLASS_LAST + 1]; |
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}; |
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/* struct aa_data - generic data structure |
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* key: name for retrieving this data |
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* size: size of data in bytes |
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* data: binary data |
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* head: reserved for rhashtable |
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*/ |
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struct aa_data { |
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char *key; |
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u32 size; |
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char *data; |
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struct rhash_head head; |
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}; |
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/* struct aa_profile - basic confinement data |
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* @base - base components of the profile (name, refcount, lists, lock ...) |
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* @label - label this profile is an extension of |
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* @parent: parent of profile |
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* @ns: namespace the profile is in |
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* @rename: optional profile name that this profile renamed |
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* @attach: human readable attachment string |
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* @xmatch: optional extended matching for unconfined executables names |
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* @xmatch_len: xmatch prefix len, used to determine xmatch priority |
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* @audit: the auditing mode of the profile |
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* @mode: the enforcement mode of the profile |
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* @path_flags: flags controlling path generation behavior |
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* @disconnected: what to prepend if attach_disconnected is specified |
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* @size: the memory consumed by this profiles rules |
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* @policy: general match rules governing policy |
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* @file: The set of rules governing basic file access and domain transitions |
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* @caps: capabilities for the profile |
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* @rlimits: rlimits for the profile |
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* |
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* @dents: dentries for the profiles file entries in apparmorfs |
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* @dirname: name of the profile dir in apparmorfs |
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* @data: hashtable for free-form policy aa_data |
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* |
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* The AppArmor profile contains the basic confinement data. Each profile |
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* has a name, and exists in a namespace. The @name and @exec_match are |
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* used to determine profile attachment against unconfined tasks. All other |
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* attachments are determined by profile X transition rules. |
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* |
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* Profiles have a hierarchy where hats and children profiles keep |
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* a reference to their parent. |
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* |
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* Profile names can not begin with a : and can not contain the \0 |
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* character. If a profile name begins with / it will be considered when |
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* determining profile attachment on "unconfined" tasks. |
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*/ |
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struct aa_profile { |
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struct aa_policy base; |
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struct aa_profile __rcu *parent; |
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struct aa_ns *ns; |
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const char *rename; |
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const char *attach; |
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struct aa_dfa *xmatch; |
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int xmatch_len; |
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enum audit_mode audit; |
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long mode; |
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u32 path_flags; |
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const char *disconnected; |
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int size; |
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struct aa_policydb policy; |
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struct aa_file_rules file; |
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struct aa_caps caps; |
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int xattr_count; |
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char **xattrs; |
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struct aa_rlimit rlimits; |
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int secmark_count; |
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struct aa_secmark *secmark; |
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struct aa_loaddata *rawdata; |
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unsigned char *hash; |
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char *dirname; |
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struct dentry *dents[AAFS_PROF_SIZEOF]; |
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struct rhashtable *data; |
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struct aa_label label; |
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}; |
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extern enum profile_mode aa_g_profile_mode; |
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#define AA_MAY_LOAD_POLICY AA_MAY_APPEND |
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#define AA_MAY_REPLACE_POLICY AA_MAY_WRITE |
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#define AA_MAY_REMOVE_POLICY AA_MAY_DELETE |
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#define profiles_ns(P) ((P)->ns) |
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#define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname) |
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void aa_add_profile(struct aa_policy *common, struct aa_profile *profile); |
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void aa_free_proxy_kref(struct kref *kref); |
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struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy, |
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gfp_t gfp); |
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struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, |
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const char *base, gfp_t gfp); |
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void aa_free_profile(struct aa_profile *profile); |
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void aa_free_profile_kref(struct kref *kref); |
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struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name); |
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struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, |
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size_t n); |
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struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name); |
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struct aa_profile *aa_fqlookupn_profile(struct aa_label *base, |
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const char *fqname, size_t n); |
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struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name); |
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ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label, |
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u32 mask, struct aa_loaddata *udata); |
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ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label, |
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char *name, size_t size); |
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void __aa_profile_list_release(struct list_head *head); |
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#define PROF_ADD 1 |
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#define PROF_REPLACE 0 |
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#define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED) |
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/** |
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* aa_get_newest_profile - simple wrapper fn to wrap the label version |
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* @p: profile (NOT NULL) |
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* |
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* Returns refcount to newest version of the profile (maybe @p) |
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* |
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* Requires: @p must be held with a valid refcount |
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*/ |
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static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p) |
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{ |
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return labels_profile(aa_get_newest_label(&p->label)); |
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} |
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static inline unsigned int PROFILE_MEDIATES(struct aa_profile *profile, |
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unsigned char class) |
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{ |
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if (class <= AA_CLASS_LAST) |
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return profile->policy.start[class]; |
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else |
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return aa_dfa_match_len(profile->policy.dfa, |
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profile->policy.start[0], &class, 1); |
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} |
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static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile, |
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u16 AF) { |
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unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET); |
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__be16 be_af = cpu_to_be16(AF); |
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if (!state) |
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return 0; |
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return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2); |
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} |
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/** |
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* aa_get_profile - increment refcount on profile @p |
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* @p: profile (MAYBE NULL) |
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* |
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* Returns: pointer to @p if @p is NULL will return NULL |
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* Requires: @p must be held with valid refcount when called |
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*/ |
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static inline struct aa_profile *aa_get_profile(struct aa_profile *p) |
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{ |
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if (p) |
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kref_get(&(p->label.count)); |
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return p; |
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} |
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/** |
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* aa_get_profile_not0 - increment refcount on profile @p found via lookup |
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* @p: profile (MAYBE NULL) |
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* |
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* Returns: pointer to @p if @p is NULL will return NULL |
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* Requires: @p must be held with valid refcount when called |
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*/ |
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static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p) |
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{ |
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if (p && kref_get_unless_zero(&p->label.count)) |
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return p; |
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return NULL; |
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} |
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/** |
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* aa_get_profile_rcu - increment a refcount profile that can be replaced |
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* @p: pointer to profile that can be replaced (NOT NULL) |
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* |
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* Returns: pointer to a refcounted profile. |
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* else NULL if no profile |
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*/ |
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static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p) |
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{ |
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struct aa_profile *c; |
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rcu_read_lock(); |
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do { |
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c = rcu_dereference(*p); |
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} while (c && !kref_get_unless_zero(&c->label.count)); |
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rcu_read_unlock(); |
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return c; |
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} |
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/** |
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* aa_put_profile - decrement refcount on profile @p |
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* @p: profile (MAYBE NULL) |
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*/ |
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static inline void aa_put_profile(struct aa_profile *p) |
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{ |
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if (p) |
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kref_put(&p->label.count, aa_label_kref); |
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} |
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static inline int AUDIT_MODE(struct aa_profile *profile) |
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{ |
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if (aa_g_audit != AUDIT_NORMAL) |
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return aa_g_audit; |
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return profile->audit; |
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} |
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bool policy_view_capable(struct aa_ns *ns); |
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bool policy_admin_capable(struct aa_ns *ns); |
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int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, |
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u32 mask); |
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#endif /* __AA_POLICY_H */
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