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Diffstat (limited to 'security/apparmor/include/policy.h')
-rw-r--r-- | security/apparmor/include/policy.h | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h new file mode 100644 index 000000000..28c098fb6 --- /dev/null +++ b/security/apparmor/include/policy.h @@ -0,0 +1,310 @@ +/* + * 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 */ |