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![Tetsuo Handa](/assets/img/avatar_default.png)
We can mark tomoyo_delete_domain() as a "static" function by moving it from domain.c to common.c . Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
461 lines
18 KiB
C
461 lines
18 KiB
C
/*
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* security/tomoyo/common.h
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*
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* Common functions for TOMOYO.
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*
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* Copyright (C) 2005-2009 NTT DATA CORPORATION
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*
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* Version: 2.2.0 2009/04/01
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*
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*/
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#ifndef _SECURITY_TOMOYO_COMMON_H
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#define _SECURITY_TOMOYO_COMMON_H
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#include <linux/ctype.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/file.h>
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#include <linux/kmod.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/list.h>
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struct dentry;
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struct vfsmount;
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/*
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* tomoyo_page_buffer is a structure which is used for holding a pathname
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* obtained from "struct dentry" and "struct vfsmount" pair.
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* As of now, it is 4096 bytes. If users complain that 4096 bytes is too small
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* (because TOMOYO escapes non ASCII printable characters using \ooo format),
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* we will make the buffer larger.
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*/
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struct tomoyo_page_buffer {
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char buffer[4096];
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};
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/*
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* tomoyo_path_info is a structure which is used for holding a string data
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* used by TOMOYO.
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* This structure has several fields for supporting pattern matching.
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*
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* (1) "name" is the '\0' terminated string data.
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* (2) "hash" is full_name_hash(name, strlen(name)).
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* This allows tomoyo_pathcmp() to compare by hash before actually compare
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* using strcmp().
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* (3) "const_len" is the length of the initial segment of "name" which
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* consists entirely of non wildcard characters. In other words, the length
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* which we can compare two strings using strncmp().
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* (4) "is_dir" is a bool which is true if "name" ends with "/",
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* false otherwise.
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* TOMOYO distinguishes directory and non-directory. A directory ends with
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* "/" and non-directory does not end with "/".
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* (5) "is_patterned" is a bool which is true if "name" contains wildcard
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* characters, false otherwise. This allows TOMOYO to use "hash" and
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* strcmp() for string comparison if "is_patterned" is false.
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* (6) "depth" is calculated using the number of "/" characters in "name".
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* This allows TOMOYO to avoid comparing two pathnames which never match
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* (e.g. whether "/var/www/html/index.html" matches "/tmp/sh-thd-\$").
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*/
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struct tomoyo_path_info {
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const char *name;
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u32 hash; /* = full_name_hash(name, strlen(name)) */
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u16 const_len; /* = tomoyo_const_part_length(name) */
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bool is_dir; /* = tomoyo_strendswith(name, "/") */
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bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
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u16 depth; /* = tomoyo_path_depth(name) */
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};
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/*
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* This is the max length of a token.
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*
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* A token consists of only ASCII printable characters.
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* Non printable characters in a token is represented in \ooo style
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* octal string. Thus, \ itself is represented as \\.
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*/
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#define TOMOYO_MAX_PATHNAME_LEN 4000
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/*
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* tomoyo_path_info_with_data is a structure which is used for holding a
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* pathname obtained from "struct dentry" and "struct vfsmount" pair.
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*
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* "struct tomoyo_path_info_with_data" consists of "struct tomoyo_path_info"
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* and buffer for the pathname, while "struct tomoyo_page_buffer" consists of
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* buffer for the pathname only.
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*
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* "struct tomoyo_path_info_with_data" is intended to allow TOMOYO to release
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* both "struct tomoyo_path_info" and buffer for the pathname by single kfree()
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* so that we don't need to return two pointers to the caller. If the caller
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* puts "struct tomoyo_path_info" on stack memory, we will be able to remove
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* "struct tomoyo_path_info_with_data".
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*/
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struct tomoyo_path_info_with_data {
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/* Keep "head" first, for this pointer is passed to tomoyo_free(). */
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struct tomoyo_path_info head;
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char barrier1[16]; /* Safeguard for overrun. */
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char body[TOMOYO_MAX_PATHNAME_LEN];
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char barrier2[16]; /* Safeguard for overrun. */
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};
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/*
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* tomoyo_acl_info is a structure which is used for holding
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*
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* (1) "list" which is linked to the ->acl_info_list of
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* "struct tomoyo_domain_info"
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* (2) "type" which tells
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* (a) type & 0x7F : type of the entry (either
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* "struct tomoyo_single_path_acl_record" or
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* "struct tomoyo_double_path_acl_record")
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* (b) type & 0x80 : whether the entry is marked as "deleted".
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*
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* Packing "struct tomoyo_acl_info" allows
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* "struct tomoyo_single_path_acl_record" to embed "u16" and
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* "struct tomoyo_double_path_acl_record" to embed "u8"
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* without enlarging their structure size.
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*/
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struct tomoyo_acl_info {
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struct list_head list;
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/*
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* Type of this ACL entry.
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*
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* MSB is is_deleted flag.
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*/
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u8 type;
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} __packed;
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/* This ACL entry is deleted. */
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#define TOMOYO_ACL_DELETED 0x80
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/*
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* tomoyo_domain_info is a structure which is used for holding permissions
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* (e.g. "allow_read /lib/libc-2.5.so") given to each domain.
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* It has following fields.
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*
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* (1) "list" which is linked to tomoyo_domain_list .
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* (2) "acl_info_list" which is linked to "struct tomoyo_acl_info".
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* (3) "domainname" which holds the name of the domain.
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* (4) "profile" which remembers profile number assigned to this domain.
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* (5) "is_deleted" is a bool which is true if this domain is marked as
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* "deleted", false otherwise.
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* (6) "quota_warned" is a bool which is used for suppressing warning message
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* when learning mode learned too much entries.
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* (7) "flags" which remembers this domain's attributes.
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*
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* A domain's lifecycle is an analogy of files on / directory.
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* Multiple domains with the same domainname cannot be created (as with
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* creating files with the same filename fails with -EEXIST).
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* If a process reached a domain, that process can reside in that domain after
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* that domain is marked as "deleted" (as with a process can access an already
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* open()ed file after that file was unlink()ed).
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*/
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struct tomoyo_domain_info {
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struct list_head list;
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struct list_head acl_info_list;
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/* Name of this domain. Never NULL. */
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const struct tomoyo_path_info *domainname;
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u8 profile; /* Profile number to use. */
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bool is_deleted; /* Delete flag. */
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bool quota_warned; /* Quota warnning flag. */
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/* DOMAIN_FLAGS_*. Use tomoyo_set_domain_flag() to modify. */
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u8 flags;
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};
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/* Profile number is an integer between 0 and 255. */
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#define TOMOYO_MAX_PROFILES 256
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/* Ignore "allow_read" directive in exception policy. */
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#define TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ 1
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/*
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* This domain was unable to create a new domain at tomoyo_find_next_domain()
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* because the name of the domain to be created was too long or
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* it could not allocate memory.
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* More than one process continued execve() without domain transition.
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*/
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#define TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED 2
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/*
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* tomoyo_single_path_acl_record is a structure which is used for holding an
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* entry with one pathname operation (e.g. open(), mkdir()).
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* It has following fields.
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*
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* (1) "head" which is a "struct tomoyo_acl_info".
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* (2) "perm" which is a bitmask of permitted operations.
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* (3) "filename" is the pathname.
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*
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* Directives held by this structure are "allow_read/write", "allow_execute",
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* "allow_read", "allow_write", "allow_create", "allow_unlink", "allow_mkdir",
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* "allow_rmdir", "allow_mkfifo", "allow_mksock", "allow_mkblock",
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* "allow_mkchar", "allow_truncate", "allow_symlink" and "allow_rewrite".
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*/
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struct tomoyo_single_path_acl_record {
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struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */
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u16 perm;
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/* Pointer to single pathname. */
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const struct tomoyo_path_info *filename;
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};
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/*
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* tomoyo_double_path_acl_record is a structure which is used for holding an
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* entry with two pathnames operation (i.e. link() and rename()).
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* It has following fields.
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*
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* (1) "head" which is a "struct tomoyo_acl_info".
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* (2) "perm" which is a bitmask of permitted operations.
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* (3) "filename1" is the source/old pathname.
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* (4) "filename2" is the destination/new pathname.
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*
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* Directives held by this structure are "allow_rename" and "allow_link".
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*/
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struct tomoyo_double_path_acl_record {
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struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */
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u8 perm;
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/* Pointer to single pathname. */
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const struct tomoyo_path_info *filename1;
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/* Pointer to single pathname. */
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const struct tomoyo_path_info *filename2;
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};
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/* Keywords for ACLs. */
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#define TOMOYO_KEYWORD_ALIAS "alias "
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#define TOMOYO_KEYWORD_ALLOW_READ "allow_read "
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#define TOMOYO_KEYWORD_DELETE "delete "
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#define TOMOYO_KEYWORD_DENY_REWRITE "deny_rewrite "
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#define TOMOYO_KEYWORD_FILE_PATTERN "file_pattern "
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#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN "initialize_domain "
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#define TOMOYO_KEYWORD_KEEP_DOMAIN "keep_domain "
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#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN "no_initialize_domain "
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#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN "no_keep_domain "
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#define TOMOYO_KEYWORD_SELECT "select "
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#define TOMOYO_KEYWORD_USE_PROFILE "use_profile "
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#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "ignore_global_allow_read"
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/* A domain definition starts with <kernel>. */
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#define TOMOYO_ROOT_NAME "<kernel>"
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#define TOMOYO_ROOT_NAME_LEN (sizeof(TOMOYO_ROOT_NAME) - 1)
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/* Index numbers for Access Controls. */
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#define TOMOYO_MAC_FOR_FILE 0 /* domain_policy.conf */
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#define TOMOYO_MAX_ACCEPT_ENTRY 1
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#define TOMOYO_VERBOSE 2
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#define TOMOYO_MAX_CONTROL_INDEX 3
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/*
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* tomoyo_io_buffer is a structure which is used for reading and modifying
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* configuration via /sys/kernel/security/tomoyo/ interface.
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* It has many fields. ->read_var1 , ->read_var2 , ->write_var1 are used as
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* cursors.
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*
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* Since the content of /sys/kernel/security/tomoyo/domain_policy is a list of
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* "struct tomoyo_domain_info" entries and each "struct tomoyo_domain_info"
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* entry has a list of "struct tomoyo_acl_info", we need two cursors when
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* reading (one is for traversing tomoyo_domain_list and the other is for
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* traversing "struct tomoyo_acl_info"->acl_info_list ).
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*
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* If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
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* "select ", TOMOYO seeks the cursor ->read_var1 and ->write_var1 to the
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* domain with the domainname specified by the rest of that line (NULL is set
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* if seek failed).
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* If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
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* "delete ", TOMOYO deletes an entry or a domain specified by the rest of that
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* line (->write_var1 is set to NULL if a domain was deleted).
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* If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
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* neither "select " nor "delete ", an entry or a domain specified by that line
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* is appended.
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*/
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struct tomoyo_io_buffer {
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int (*read) (struct tomoyo_io_buffer *);
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int (*write) (struct tomoyo_io_buffer *);
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/* Exclusive lock for this structure. */
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struct mutex io_sem;
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/* The position currently reading from. */
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struct list_head *read_var1;
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/* Extra variables for reading. */
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struct list_head *read_var2;
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/* The position currently writing to. */
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struct tomoyo_domain_info *write_var1;
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/* The step for reading. */
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int read_step;
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/* Buffer for reading. */
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char *read_buf;
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/* EOF flag for reading. */
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bool read_eof;
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/* Read domain ACL of specified PID? */
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bool read_single_domain;
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/* Extra variable for reading. */
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u8 read_bit;
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/* Bytes available for reading. */
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int read_avail;
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/* Size of read buffer. */
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int readbuf_size;
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/* Buffer for writing. */
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char *write_buf;
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/* Bytes available for writing. */
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int write_avail;
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/* Size of write buffer. */
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int writebuf_size;
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};
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/* Check whether the domain has too many ACL entries to hold. */
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bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain);
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/* Transactional sprintf() for policy dump. */
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bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
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__attribute__ ((format(printf, 2, 3)));
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/* Check whether the domainname is correct. */
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bool tomoyo_is_correct_domain(const unsigned char *domainname,
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const char *function);
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/* Check whether the token is correct. */
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bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
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const s8 pattern_type, const s8 end_type,
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const char *function);
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/* Check whether the token can be a domainname. */
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bool tomoyo_is_domain_def(const unsigned char *buffer);
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/* Check whether the given filename matches the given pattern. */
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bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
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const struct tomoyo_path_info *pattern);
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/* Read "alias" entry in exception policy. */
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bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head);
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/*
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* Read "initialize_domain" and "no_initialize_domain" entry
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* in exception policy.
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*/
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bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head);
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/* Read "keep_domain" and "no_keep_domain" entry in exception policy. */
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bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head);
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/* Read "file_pattern" entry in exception policy. */
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bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head);
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/* Read "allow_read" entry in exception policy. */
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bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head);
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/* Read "deny_rewrite" entry in exception policy. */
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bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head);
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/* Write domain policy violation warning message to console? */
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bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
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/* Convert double path operation to operation name. */
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const char *tomoyo_dp2keyword(const u8 operation);
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/* Get the last component of the given domainname. */
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const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain);
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/* Get warning message. */
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const char *tomoyo_get_msg(const bool is_enforce);
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/* Convert single path operation to operation name. */
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const char *tomoyo_sp2keyword(const u8 operation);
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/* Create "alias" entry in exception policy. */
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int tomoyo_write_alias_policy(char *data, const bool is_delete);
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/*
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* Create "initialize_domain" and "no_initialize_domain" entry
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* in exception policy.
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*/
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int tomoyo_write_domain_initializer_policy(char *data, const bool is_not,
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const bool is_delete);
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/* Create "keep_domain" and "no_keep_domain" entry in exception policy. */
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int tomoyo_write_domain_keeper_policy(char *data, const bool is_not,
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const bool is_delete);
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/*
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* Create "allow_read/write", "allow_execute", "allow_read", "allow_write",
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* "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
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* "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
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* "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and
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* "allow_link" entry in domain policy.
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*/
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int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
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const bool is_delete);
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/* Create "allow_read" entry in exception policy. */
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int tomoyo_write_globally_readable_policy(char *data, const bool is_delete);
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/* Create "deny_rewrite" entry in exception policy. */
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int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete);
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/* Create "file_pattern" entry in exception policy. */
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int tomoyo_write_pattern_policy(char *data, const bool is_delete);
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/* Find a domain by the given name. */
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struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
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/* Find or create a domain by the given name. */
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struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
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domainname,
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const u8 profile);
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/* Check mode for specified functionality. */
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unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
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const u8 index);
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/* Allocate memory for structures. */
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void *tomoyo_alloc_acl_element(const u8 acl_type);
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/* Fill in "struct tomoyo_path_info" members. */
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void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
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/* Run policy loader when /sbin/init starts. */
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void tomoyo_load_policy(const char *filename);
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/* Change "struct tomoyo_domain_info"->flags. */
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void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain,
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const bool is_delete, const u8 flags);
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/* strcmp() for "struct tomoyo_path_info" structure. */
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static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
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const struct tomoyo_path_info *b)
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{
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return a->hash != b->hash || strcmp(a->name, b->name);
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}
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/* Get type of an ACL entry. */
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static inline u8 tomoyo_acl_type1(struct tomoyo_acl_info *ptr)
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{
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return ptr->type & ~TOMOYO_ACL_DELETED;
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}
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/* Get type of an ACL entry. */
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static inline u8 tomoyo_acl_type2(struct tomoyo_acl_info *ptr)
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{
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return ptr->type;
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}
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/**
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* tomoyo_is_valid - Check whether the character is a valid char.
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*
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* @c: The character to check.
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*
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* Returns true if @c is a valid character, false otherwise.
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*/
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static inline bool tomoyo_is_valid(const unsigned char c)
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{
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return c > ' ' && c < 127;
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}
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|
|
|
/**
|
|
* tomoyo_is_invalid - Check whether the character is an invalid char.
|
|
*
|
|
* @c: The character to check.
|
|
*
|
|
* Returns true if @c is an invalid character, false otherwise.
|
|
*/
|
|
static inline bool tomoyo_is_invalid(const unsigned char c)
|
|
{
|
|
return c && (c <= ' ' || c >= 127);
|
|
}
|
|
|
|
/* The list for "struct tomoyo_domain_info". */
|
|
extern struct list_head tomoyo_domain_list;
|
|
extern struct rw_semaphore tomoyo_domain_list_lock;
|
|
|
|
/* Lock for domain->acl_info_list. */
|
|
extern struct rw_semaphore tomoyo_domain_acl_info_list_lock;
|
|
|
|
/* Has /sbin/init started? */
|
|
extern bool tomoyo_policy_loaded;
|
|
|
|
/* The kernel's domain. */
|
|
extern struct tomoyo_domain_info tomoyo_kernel_domain;
|
|
|
|
/**
|
|
* list_for_each_cookie - iterate over a list with cookie.
|
|
* @pos: the &struct list_head to use as a loop cursor.
|
|
* @cookie: the &struct list_head to use as a cookie.
|
|
* @head: the head for your list.
|
|
*
|
|
* Same with list_for_each() except that this primitive uses @cookie
|
|
* so that we can continue iteration.
|
|
* @cookie must be NULL when iteration starts, and @cookie will become
|
|
* NULL when iteration finishes.
|
|
*/
|
|
#define list_for_each_cookie(pos, cookie, head) \
|
|
for (({ if (!cookie) \
|
|
cookie = head; }), \
|
|
pos = (cookie)->next; \
|
|
prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
|
|
(cookie) = pos, pos = pos->next)
|
|
|
|
#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */
|