360 lines
13 KiB
C
360 lines
13 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-pre 2009/02/01
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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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/* Temporary buffer for holding pathnames. */
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struct tomoyo_page_buffer {
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char buffer[4096];
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};
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/* Structure for holding a token. */
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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 total_len; /* = 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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/* Structure for holding requested pathname. */
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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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* Common header for holding ACL entries.
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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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/* Structure for domain information. */
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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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u8 is_deleted; /* Delete flag.
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0 = active.
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1 = deleted but undeletable.
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255 = deleted and no longer undeletable. */
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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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* Structure for "allow_read/write", "allow_execute", "allow_read",
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* "allow_write", "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" and "allow_rewrite" directive.
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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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/* Structure for "allow_rename" and "allow_link" directive. */
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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_UNDELETE "undelete "
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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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/* Structure for reading/writing policy via securityfs interfaces. */
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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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/* Delete a domain. */
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int tomoyo_delete_domain(char *data);
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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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/* Undelete a domain. */
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struct tomoyo_domain_info *tomoyo_undelete_domain(const char *domainname);
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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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/**
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* tomoyo_is_invalid - Check whether the character is an invalid 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 an invalid character, false otherwise.
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*/
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static inline bool tomoyo_is_invalid(const unsigned char c)
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{
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return c && (c <= ' ' || c >= 127);
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}
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/* The list for "struct tomoyo_domain_info". */
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extern struct list_head tomoyo_domain_list;
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extern struct rw_semaphore tomoyo_domain_list_lock;
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/* Lock for domain->acl_info_list. */
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extern struct rw_semaphore tomoyo_domain_acl_info_list_lock;
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/* Has /sbin/init started? */
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extern bool tomoyo_policy_loaded;
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/* The kernel's domain. */
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extern struct tomoyo_domain_info tomoyo_kernel_domain;
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/**
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* list_for_each_cookie - iterate over a list with cookie.
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* @pos: the &struct list_head to use as a loop cursor.
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* @cookie: the &struct list_head to use as a cookie.
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* @head: the head for your list.
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*
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* Same with list_for_each() except that this primitive uses @cookie
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* so that we can continue iteration.
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* @cookie must be NULL when iteration starts, and @cookie will become
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* NULL when iteration finishes.
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*/
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#define list_for_each_cookie(pos, cookie, head) \
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for (({ if (!cookie) \
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cookie = head; }), \
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pos = (cookie)->next; \
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prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
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(cookie) = pos, pos = pos->next)
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#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */
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