/* SPDX-License-Identifier: GPL-2.0-only *//* * AppArmor security module * * This file contains AppArmor policy definitions. * * Copyright (C) 1998-2008 Novell/SUSE * Copyright 2009-2010 Canonical Ltd. */ #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 "perms.h"#include "resource.h"  struct aa_ns; extern int unprivileged_userns_apparmor_policy;extern int aa_unprivileged_unconfined_restricted; extern const char *const aa_profile_mode_names[]; #define PROFILE_MODE(_profile, _mode)		\	((aa_g_profile_mode == (_mode)) ||	\	 ((_profile)->mode == (_mode))) #define COMPLAIN_MODE(_profile)	PROFILE_MODE((_profile), APPARMOR_COMPLAIN) #define USER_MODE(_profile)	PROFILE_MODE((_profile), APPARMOR_USER) #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL) #define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT) #define CHECK_DEBUG1(_profile) ((_profile)->label.flags & FLAG_DEBUG1) #define CHECK_DEBUG2(_profile) ((_profile)->label.flags & FLAG_DEBUG2) #define profile_is_stale(_profile) (label_is_stale(&(_profile)->label)) #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2) /* flags in the dfa accept2 table */enum dfa_accept_flags {	ACCEPT_FLAG_OWNER = 1,}; /* * 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 */	APPARMOR_USER,		/* modified complain mode to userspace */	PROFILE_MODE_NAMES_COUNT	/* Must be last entry */};  struct aa_tags_header {	u32 mask;	/* bit mask matching permissions */	u32 count;	/* number of strings per entry */	u32 size;	/* size of all strings covered by count */	u32 tags;	/* index into string table */}; struct aa_tags_struct {	struct {		u32 size;		/* number of entries in tagsets */		u32 *table;		/* indexes into headers & strs */	} sets;	struct {		u32 size;		/* number of headers == num of strs */		struct aa_tags_header *table;	} hdrs;	struct aa_str_table strs;}; /* struct aa_policydb - match engine for a policy * @count: refcount for the pdb * @dfa: dfa pattern match * @perms: table of permissions * @size: number of entries in @perms * @trans: table of strings, index by x * @tags: table of tags that perms->tag indexes * @start:_states to start in for each class * start: set of start states for the different classes of data */struct aa_policydb {	struct kref count;	struct aa_dfa *dfa;	struct {		struct aa_perms *perms;		u32 size;	};	struct aa_str_table trans;	struct aa_tags_struct tags;	aa_state_t start[AA_CLASS_LAST + 1];}; extern struct aa_policydb *nullpdb; void aa_destroy_tags(struct aa_tags_struct *tags);struct aa_policydb *aa_alloc_pdb(gfp_t gfp);void aa_pdb_free_kref(struct kref *kref); /** * aa_get_pdb - increment refcount on @pdb * @pdb: policydb  (MAYBE NULL) * * Returns: pointer to @pdb if @pdb is NULL will return NULL * Requires: @pdb must be held with valid refcount when called */static inline struct aa_policydb *aa_get_pdb(struct aa_policydb *pdb){	if (pdb)		kref_get(&(pdb->count)); 	return pdb;} /** * aa_put_pdb - put a pdb refcount * @pdb: pdb to put refcount   (MAYBE NULL) * * Requires: if @pdb != NULL that a valid refcount be held */static inline void aa_put_pdb(struct aa_policydb *pdb){	if (pdb)		kref_put(&pdb->count, aa_pdb_free_kref);} /* lookup perm that doesn't have and object conditional */static inline struct aa_perms *aa_lookup_perms(struct aa_policydb *policy,					       aa_state_t state){	unsigned int index = ACCEPT_TABLE(policy->dfa)[state]; 	if (!(policy->perms))		return &default_perms; 	return &(policy->perms[index]);} /* 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_ruleset - data covering mediation rules * @list: list the rule is on * @size: the memory consumed by this ruleset * @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 * @secmark_count: number of secmark entries * @secmark: secmark label match info */struct aa_ruleset {	int size; 	/* TODO: merge policy and file */	struct aa_policydb *policy;	struct aa_policydb *file;	struct aa_caps caps; 	struct aa_rlimit rlimits; 	int secmark_count;	struct aa_secmark *secmark;};  /* struct aa_attachment - data and rules for a profiles attachment * @list: * @xmatch_str: human readable attachment string * @xmatch: optional extended matching for unconfined executables names * @xmatch_len: xmatch prefix len, used to determine xmatch priority * @xattr_count: number of xattrs in table * @xattrs: table of xattrs */struct aa_attachment {	const char *xmatch_str;	struct aa_policydb *xmatch;	unsigned int xmatch_len;	int xattr_count;	char **xattrs;}; /* struct aa_profile - basic confinement data * @base - base components of the profile (name, refcount, lists, lock ...) * @parent: parent of profile * @ns: namespace the profile is in * @rename: optional profile name that this profile renamed * * @audit: the auditing mode of the profile * @mode: the enforcement mode of the profile * @path_flags: flags controlling path generation behavior * @signal: the signal that should be used when kill is used * @disconnected: what to prepend if attach_disconnected is specified * @attach: attachment rules for the profile * @rules: rules to be enforced * * learning_cache: the accesses learned in complain mode * raw_data: rawdata of the loaded profile policy * hash: cryptographic hash of the profile * @dents: dentries for the profiles file entries in apparmorfs * @dirname: name of the profile dir in apparmorfs * @dents: set of dentries associated with the profile * @data: hashtable for free-form policy aa_data * @label - label this profile is an extension of * @rules - label with the rule vec on its end * * 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; 	enum audit_mode audit;	long mode;	u32 path_flags;	int signal;	const char *disconnected; 	struct aa_attachment attach; 	struct aa_loaddata *rawdata;	unsigned char *hash;	char *dirname;	struct dentry *dents[AAFS_PROF_SIZEOF];	struct rhashtable *data; 	int n_rules;	/* special - variable length must be last entry in profile */	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) struct aa_ruleset *aa_alloc_ruleset(gfp_t gfp);struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy,				    gfp_t gfp);struct aa_profile *aa_alloc_null(struct aa_profile *parent, const char *name,				 gfp_t gfp);struct aa_profile *__aa_new_learning_profile(struct aa_profile *parent,					     bool hat, const char *base,					     gfp_t gfp);struct aa_profile *aa_new_learning_profile(struct aa_profile *parent, bool hat,					   const char *base, gfp_t gfp);void aa_free_profile(struct aa_profile *profile);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_fqlookupn_profile(struct aa_label *base,					const char *fqname, size_t n); ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label,			    u32 mask, struct aa_loaddata *udata,			    char *compressed_profile, size_t compressed_size);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 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 aa_state_t RULE_MEDIATES(struct aa_ruleset *rules,				       unsigned char class){	if (class <= AA_CLASS_LAST)		return rules->policy->start[class];	else		return aa_dfa_match_len(rules->policy->dfa,					rules->policy->start[0], &class, 1);} static inline aa_state_t RULE_MEDIATES_v9NET(struct aa_ruleset *rules){	return RULE_MEDIATES(rules, AA_CLASS_NETV9);} static inline aa_state_t RULE_MEDIATES_NET(struct aa_ruleset *rules){	/* can not use RULE_MEDIATE_v9AF here, because AF match fail	 * can not be distiguished from class match fail, and we only	 * fallback to checking older class on class match failure	 */	aa_state_t state = RULE_MEDIATES(rules, AA_CLASS_NETV9); 	/* fallback and check v7/8 if v9 is NOT mediated */	if (!state)		state = RULE_MEDIATES(rules, AA_CLASS_NET);	return state;} static inline aa_state_t RULE_MEDIATES_UNIX(struct aa_ruleset *rules){	return RULE_MEDIATES_v9NET(rules);}  void aa_compute_profile_mediates(struct aa_profile *profile);static inline bool profile_mediates(struct aa_profile *profile,				    unsigned char class){	return label_mediates(&profile->label, class);} static inline bool profile_mediates_safe(struct aa_profile *profile,					 unsigned char class){	return label_mediates_safe(&profile->label, class);} /** * 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.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.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.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.count, aa_label_kref);} static inline int AUDIT_MODE(const struct aa_profile *profile){	if (aa_g_audit != AUDIT_NORMAL)		return aa_g_audit; 	return profile->audit;} bool aa_policy_view_capable(const struct cred *subj_cred,			    struct aa_label *label, struct aa_ns *ns);bool aa_policy_admin_capable(const struct cred *subj_cred,			     struct aa_label *label, struct aa_ns *ns);int aa_may_manage_policy(const struct cred *subj_cred,			 struct aa_label *label, struct aa_ns *ns,			 const struct cred *ocred, u32 mask);bool aa_current_policy_view_capable(struct aa_ns *ns);bool aa_current_policy_admin_capable(struct aa_ns *ns); #endif /* __AA_POLICY_H */