/* * AppArmor security module * * This file contains AppArmor file mediation function 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_FILE_H#define __AA_FILE_H #include <linux/spinlock.h> #include "domain.h"#include "match.h"#include "perms.h" struct aa_profile;struct path; #define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND)) #define AA_AUDIT_FILE_MASK	(MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\				 AA_MAY_CREATE | AA_MAY_DELETE |	\				 AA_MAY_GETATTR | AA_MAY_SETATTR | \				 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \				 AA_EXEC_MMAP | AA_MAY_LINK) #define file_ctx(X) ((struct aa_file_ctx *)(X)->f_security) /* struct aa_file_ctx - the AppArmor context the file was opened in * @lock: lock to update the ctx * @label: label currently cached on the ctx * @perms: the permission the file was opened with */struct aa_file_ctx {	spinlock_t lock;	struct aa_label __rcu *label;	u32 allow;}; /** * aa_alloc_file_ctx - allocate file_ctx * @label: initial label of task creating the file * @gfp: gfp flags for allocation * * Returns: file_ctx or NULL on failure */static inline struct aa_file_ctx *aa_alloc_file_ctx(struct aa_label *label,						    gfp_t gfp){	struct aa_file_ctx *ctx; 	ctx = kzalloc(sizeof(struct aa_file_ctx), gfp);	if (ctx) {		spin_lock_init(&ctx->lock);		rcu_assign_pointer(ctx->label, aa_get_label(label));	}	return ctx;} /** * aa_free_file_ctx - free a file_ctx * @ctx: file_ctx to free  (MAYBE_NULL) */static inline void aa_free_file_ctx(struct aa_file_ctx *ctx){	if (ctx) {		aa_put_label(rcu_access_pointer(ctx->label));		kzfree(ctx);	}} static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx){	return aa_get_label_rcu(&ctx->label);} /* * The xindex is broken into 3 parts * - index - an index into either the exec name table or the variable table * - exec type - which determines how the executable name and index are used * - flags - which modify how the destination name is applied */#define AA_X_INDEX_MASK		0x03ff #define AA_X_TYPE_MASK		0x0c00#define AA_X_TYPE_SHIFT		10#define AA_X_NONE		0x0000#define AA_X_NAME		0x0400	/* use executable name px */#define AA_X_TABLE		0x0800	/* use a specified name ->n# */ #define AA_X_UNSAFE		0x1000#define AA_X_CHILD		0x2000	/* make >AA_X_NONE apply to children */#define AA_X_INHERIT		0x4000#define AA_X_UNCONFINED		0x8000 /* AA_SECURE_X_NEEDED - is passed in the bprm->unsafe field */#define AA_SECURE_X_NEEDED	0x8000 /* need to make conditional which ones are being set */struct path_cond {	kuid_t uid;	umode_t mode;}; #define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill) /* FIXME: split perms from dfa and match this to description *        also add delegation info. */static inline u16 dfa_map_xindex(u16 mask){	u16 old_index = (mask >> 10) & 0xf;	u16 index = 0; 	if (mask & 0x100)		index |= AA_X_UNSAFE;	if (mask & 0x200)		index |= AA_X_INHERIT;	if (mask & 0x80)		index |= AA_X_UNCONFINED; 	if (old_index == 1) {		index |= AA_X_UNCONFINED;	} else if (old_index == 2) {		index |= AA_X_NAME;	} else if (old_index == 3) {		index |= AA_X_NAME | AA_X_CHILD;	} else if (old_index) {		index |= AA_X_TABLE;		index |= old_index - 4;	} 	return index;} /* * map old dfa inline permissions to new format */#define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) | \				    ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))#define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f)#define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f)#define dfa_user_xindex(dfa, state) \	(dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff)) #define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \				      0x7f) |				\				     ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))#define dfa_other_audit(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 14) & 0x7f)#define dfa_other_quiet(dfa, state) \	((((ACCEPT_TABLE2(dfa)[state]) >> 7) >> 14) & 0x7f)#define dfa_other_xindex(dfa, state) \	dfa_map_xindex((ACCEPT_TABLE(dfa)[state] >> 14) & 0x3fff) int aa_audit_file(struct aa_profile *profile, struct aa_perms *perms,		  const char *op, u32 request, const char *name,		  const char *target, struct aa_label *tlabel, kuid_t ouid,		  const char *info, int error); /** * struct aa_file_rules - components used for file rule permissions * @dfa: dfa to match path names and conditionals against * @perms: permission table indexed by the matched state accept entry of @dfa * @trans: transition table for indexed by named x transitions * * File permission are determined by matching a path against @dfa and then * then using the value of the accept entry for the matching state as * an index into @perms.  If a named exec transition is required it is * looked up in the transition table. */struct aa_file_rules {	unsigned int start;	struct aa_dfa *dfa;	/* struct perms perms; */	struct aa_domain trans;	/* TODO: add delegate table */}; struct aa_perms aa_compute_fperms(struct aa_dfa *dfa, unsigned int state,				    struct path_cond *cond);unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,			  const char *name, struct path_cond *cond,			  struct aa_perms *perms); int __aa_path_perm(const char *op, struct aa_profile *profile,		   const char *name, u32 request, struct path_cond *cond,		   int flags, struct aa_perms *perms);int aa_path_perm(const char *op, struct aa_label *label,		 const struct path *path, int flags, u32 request,		 struct path_cond *cond); int aa_path_link(struct aa_label *label, struct dentry *old_dentry,		 const struct path *new_dir, struct dentry *new_dentry); int aa_file_perm(const char *op, struct aa_label *label, struct file *file,		 u32 request); void aa_inherit_files(const struct cred *cred, struct files_struct *files); static inline void aa_free_file_rules(struct aa_file_rules *rules){	aa_put_dfa(rules->dfa);	aa_free_domain_entries(&rules->trans);} /** * aa_map_file_perms - map file flags to AppArmor permissions * @file: open file to map flags to AppArmor permissions * * Returns: apparmor permission set for the file */static inline u32 aa_map_file_to_perms(struct file *file){	int flags = file->f_flags;	u32 perms = 0; 	if (file->f_mode & FMODE_WRITE)		perms |= MAY_WRITE;	if (file->f_mode & FMODE_READ)		perms |= MAY_READ; 	if ((flags & O_APPEND) && (perms & MAY_WRITE))		perms = (perms & ~MAY_WRITE) | MAY_APPEND;	/* trunc implies write permission */	if (flags & O_TRUNC)		perms |= MAY_WRITE;	if (flags & O_CREAT)		perms |= AA_MAY_CREATE; 	return perms;} #endif /* __AA_FILE_H */