1242 lines
35 KiB
C
1242 lines
35 KiB
C
/*
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* security/tomoyo/file.c
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*
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* Implementation of the Domain-Based Mandatory Access Control.
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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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#include "common.h"
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#include "tomoyo.h"
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#include "realpath.h"
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#define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE])
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/* Structure for "allow_read" keyword. */
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struct tomoyo_globally_readable_file_entry {
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struct list_head list;
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const struct tomoyo_path_info *filename;
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bool is_deleted;
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};
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/* Structure for "file_pattern" keyword. */
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struct tomoyo_pattern_entry {
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struct list_head list;
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const struct tomoyo_path_info *pattern;
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bool is_deleted;
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};
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/* Structure for "deny_rewrite" keyword. */
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struct tomoyo_no_rewrite_entry {
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struct list_head list;
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const struct tomoyo_path_info *pattern;
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bool is_deleted;
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};
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/* Keyword array for single path operations. */
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static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = {
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[TOMOYO_TYPE_READ_WRITE_ACL] = "read/write",
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[TOMOYO_TYPE_EXECUTE_ACL] = "execute",
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[TOMOYO_TYPE_READ_ACL] = "read",
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[TOMOYO_TYPE_WRITE_ACL] = "write",
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[TOMOYO_TYPE_CREATE_ACL] = "create",
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[TOMOYO_TYPE_UNLINK_ACL] = "unlink",
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[TOMOYO_TYPE_MKDIR_ACL] = "mkdir",
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[TOMOYO_TYPE_RMDIR_ACL] = "rmdir",
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[TOMOYO_TYPE_MKFIFO_ACL] = "mkfifo",
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[TOMOYO_TYPE_MKSOCK_ACL] = "mksock",
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[TOMOYO_TYPE_MKBLOCK_ACL] = "mkblock",
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[TOMOYO_TYPE_MKCHAR_ACL] = "mkchar",
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[TOMOYO_TYPE_TRUNCATE_ACL] = "truncate",
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[TOMOYO_TYPE_SYMLINK_ACL] = "symlink",
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[TOMOYO_TYPE_REWRITE_ACL] = "rewrite",
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};
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/* Keyword array for double path operations. */
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static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = {
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[TOMOYO_TYPE_LINK_ACL] = "link",
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[TOMOYO_TYPE_RENAME_ACL] = "rename",
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};
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/**
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* tomoyo_sp2keyword - Get the name of single path operation.
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*
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* @operation: Type of operation.
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*
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* Returns the name of single path operation.
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*/
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const char *tomoyo_sp2keyword(const u8 operation)
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{
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return (operation < TOMOYO_MAX_SINGLE_PATH_OPERATION)
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? tomoyo_sp_keyword[operation] : NULL;
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}
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/**
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* tomoyo_dp2keyword - Get the name of double path operation.
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*
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* @operation: Type of operation.
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*
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* Returns the name of double path operation.
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*/
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const char *tomoyo_dp2keyword(const u8 operation)
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{
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return (operation < TOMOYO_MAX_DOUBLE_PATH_OPERATION)
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? tomoyo_dp_keyword[operation] : NULL;
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}
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/**
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* tomoyo_strendswith - Check whether the token ends with the given token.
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*
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* @name: The token to check.
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* @tail: The token to find.
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*
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* Returns true if @name ends with @tail, false otherwise.
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*/
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static bool tomoyo_strendswith(const char *name, const char *tail)
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{
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int len;
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if (!name || !tail)
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return false;
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len = strlen(name) - strlen(tail);
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return len >= 0 && !strcmp(name + len, tail);
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}
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/**
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* tomoyo_get_path - Get realpath.
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*
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* @path: Pointer to "struct path".
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*
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* Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
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*/
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static struct tomoyo_path_info *tomoyo_get_path(struct path *path)
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{
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int error;
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struct tomoyo_path_info_with_data *buf = tomoyo_alloc(sizeof(*buf));
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if (!buf)
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return NULL;
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/* Reserve one byte for appending "/". */
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error = tomoyo_realpath_from_path2(path, buf->body,
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sizeof(buf->body) - 2);
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if (!error) {
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buf->head.name = buf->body;
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tomoyo_fill_path_info(&buf->head);
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return &buf->head;
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}
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tomoyo_free(buf);
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return NULL;
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}
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/* Lock for domain->acl_info_list. */
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DECLARE_RWSEM(tomoyo_domain_acl_info_list_lock);
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static int tomoyo_update_double_path_acl(const u8 type, const char *filename1,
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const char *filename2,
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struct tomoyo_domain_info *
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const domain, const bool is_delete);
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static int tomoyo_update_single_path_acl(const u8 type, const char *filename,
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struct tomoyo_domain_info *
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const domain, const bool is_delete);
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/* The list for "struct tomoyo_globally_readable_file_entry". */
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static LIST_HEAD(tomoyo_globally_readable_list);
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static DECLARE_RWSEM(tomoyo_globally_readable_list_lock);
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/**
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* tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list.
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*
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* @filename: Filename unconditionally permitted to open() for reading.
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* @is_delete: True if it is a delete request.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_update_globally_readable_entry(const char *filename,
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const bool is_delete)
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{
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struct tomoyo_globally_readable_file_entry *new_entry;
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struct tomoyo_globally_readable_file_entry *ptr;
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const struct tomoyo_path_info *saved_filename;
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int error = -ENOMEM;
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if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__))
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return -EINVAL;
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saved_filename = tomoyo_save_name(filename);
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if (!saved_filename)
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return -ENOMEM;
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/***** EXCLUSIVE SECTION START *****/
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down_write(&tomoyo_globally_readable_list_lock);
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list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
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if (ptr->filename != saved_filename)
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continue;
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ptr->is_deleted = is_delete;
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error = 0;
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goto out;
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}
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if (is_delete) {
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error = -ENOENT;
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goto out;
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}
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new_entry = tomoyo_alloc_element(sizeof(*new_entry));
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if (!new_entry)
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goto out;
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new_entry->filename = saved_filename;
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list_add_tail(&new_entry->list, &tomoyo_globally_readable_list);
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error = 0;
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out:
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up_write(&tomoyo_globally_readable_list_lock);
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/***** EXCLUSIVE SECTION END *****/
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return error;
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}
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/**
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* tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading.
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*
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* @filename: The filename to check.
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*
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* Returns true if any domain can open @filename for reading, false otherwise.
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*/
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static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info *
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filename)
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{
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struct tomoyo_globally_readable_file_entry *ptr;
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bool found = false;
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down_read(&tomoyo_globally_readable_list_lock);
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list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
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if (!ptr->is_deleted &&
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tomoyo_path_matches_pattern(filename, ptr->filename)) {
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found = true;
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break;
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}
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}
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up_read(&tomoyo_globally_readable_list_lock);
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return found;
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}
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/**
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* tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list.
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*
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* @data: String to parse.
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* @is_delete: True if it is a delete request.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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int tomoyo_write_globally_readable_policy(char *data, const bool is_delete)
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{
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return tomoyo_update_globally_readable_entry(data, is_delete);
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}
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/**
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* tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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*
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* Returns true on success, false otherwise.
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*/
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bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head)
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{
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struct list_head *pos;
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bool done = true;
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down_read(&tomoyo_globally_readable_list_lock);
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list_for_each_cookie(pos, head->read_var2,
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&tomoyo_globally_readable_list) {
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struct tomoyo_globally_readable_file_entry *ptr;
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ptr = list_entry(pos,
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struct tomoyo_globally_readable_file_entry,
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list);
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if (ptr->is_deleted)
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continue;
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if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n",
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ptr->filename->name)) {
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done = false;
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break;
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}
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}
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up_read(&tomoyo_globally_readable_list_lock);
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return done;
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}
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/* The list for "struct tomoyo_pattern_entry". */
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static LIST_HEAD(tomoyo_pattern_list);
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static DECLARE_RWSEM(tomoyo_pattern_list_lock);
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/**
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* tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list.
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*
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* @pattern: Pathname pattern.
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* @is_delete: True if it is a delete request.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_update_file_pattern_entry(const char *pattern,
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const bool is_delete)
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{
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struct tomoyo_pattern_entry *new_entry;
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struct tomoyo_pattern_entry *ptr;
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const struct tomoyo_path_info *saved_pattern;
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int error = -ENOMEM;
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if (!tomoyo_is_correct_path(pattern, 0, 1, 0, __func__))
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return -EINVAL;
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saved_pattern = tomoyo_save_name(pattern);
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if (!saved_pattern)
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return -ENOMEM;
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/***** EXCLUSIVE SECTION START *****/
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down_write(&tomoyo_pattern_list_lock);
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list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
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if (saved_pattern != ptr->pattern)
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continue;
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ptr->is_deleted = is_delete;
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error = 0;
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goto out;
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}
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if (is_delete) {
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error = -ENOENT;
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goto out;
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}
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new_entry = tomoyo_alloc_element(sizeof(*new_entry));
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if (!new_entry)
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goto out;
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new_entry->pattern = saved_pattern;
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list_add_tail(&new_entry->list, &tomoyo_pattern_list);
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error = 0;
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out:
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up_write(&tomoyo_pattern_list_lock);
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/***** EXCLUSIVE SECTION END *****/
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return error;
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}
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/**
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* tomoyo_get_file_pattern - Get patterned pathname.
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*
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* @filename: The filename to find patterned pathname.
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*
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* Returns pointer to pathname pattern if matched, @filename otherwise.
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*/
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static const struct tomoyo_path_info *
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tomoyo_get_file_pattern(const struct tomoyo_path_info *filename)
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{
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struct tomoyo_pattern_entry *ptr;
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const struct tomoyo_path_info *pattern = NULL;
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down_read(&tomoyo_pattern_list_lock);
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list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
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if (ptr->is_deleted)
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continue;
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if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
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continue;
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pattern = ptr->pattern;
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if (tomoyo_strendswith(pattern->name, "/\\*")) {
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/* Do nothing. Try to find the better match. */
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} else {
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/* This would be the better match. Use this. */
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break;
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}
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}
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up_read(&tomoyo_pattern_list_lock);
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if (pattern)
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filename = pattern;
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return filename;
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}
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/**
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* tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list.
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*
|
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* @data: String to parse.
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* @is_delete: True if it is a delete request.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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int tomoyo_write_pattern_policy(char *data, const bool is_delete)
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{
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return tomoyo_update_file_pattern_entry(data, is_delete);
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}
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/**
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* tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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*
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* Returns true on success, false otherwise.
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*/
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bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head)
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{
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struct list_head *pos;
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bool done = true;
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down_read(&tomoyo_pattern_list_lock);
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list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) {
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struct tomoyo_pattern_entry *ptr;
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ptr = list_entry(pos, struct tomoyo_pattern_entry, list);
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if (ptr->is_deleted)
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continue;
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if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN "%s\n",
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ptr->pattern->name)) {
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done = false;
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break;
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}
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}
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up_read(&tomoyo_pattern_list_lock);
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return done;
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}
|
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|
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/* The list for "struct tomoyo_no_rewrite_entry". */
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static LIST_HEAD(tomoyo_no_rewrite_list);
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static DECLARE_RWSEM(tomoyo_no_rewrite_list_lock);
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/**
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* tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list.
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*
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* @pattern: Pathname pattern that are not rewritable by default.
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* @is_delete: True if it is a delete request.
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*
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* Returns 0 on success, negative value otherwise.
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*/
|
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static int tomoyo_update_no_rewrite_entry(const char *pattern,
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const bool is_delete)
|
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{
|
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struct tomoyo_no_rewrite_entry *new_entry, *ptr;
|
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const struct tomoyo_path_info *saved_pattern;
|
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int error = -ENOMEM;
|
|
|
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if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__))
|
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return -EINVAL;
|
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saved_pattern = tomoyo_save_name(pattern);
|
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if (!saved_pattern)
|
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return -ENOMEM;
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_no_rewrite_list_lock);
|
|
list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
|
|
if (ptr->pattern != saved_pattern)
|
|
continue;
|
|
ptr->is_deleted = is_delete;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
if (is_delete) {
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
new_entry = tomoyo_alloc_element(sizeof(*new_entry));
|
|
if (!new_entry)
|
|
goto out;
|
|
new_entry->pattern = saved_pattern;
|
|
list_add_tail(&new_entry->list, &tomoyo_no_rewrite_list);
|
|
error = 0;
|
|
out:
|
|
up_write(&tomoyo_no_rewrite_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited.
|
|
*
|
|
* @filename: Filename to check.
|
|
*
|
|
* Returns true if @filename is specified by "deny_rewrite" directive,
|
|
* false otherwise.
|
|
*/
|
|
static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename)
|
|
{
|
|
struct tomoyo_no_rewrite_entry *ptr;
|
|
bool found = false;
|
|
|
|
down_read(&tomoyo_no_rewrite_list_lock);
|
|
list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
|
|
if (ptr->is_deleted)
|
|
continue;
|
|
if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
|
|
continue;
|
|
found = true;
|
|
break;
|
|
}
|
|
up_read(&tomoyo_no_rewrite_list_lock);
|
|
return found;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list.
|
|
*
|
|
* @data: String to parse.
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete)
|
|
{
|
|
return tomoyo_update_no_rewrite_entry(data, is_delete);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*/
|
|
bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head)
|
|
{
|
|
struct list_head *pos;
|
|
bool done = true;
|
|
|
|
down_read(&tomoyo_no_rewrite_list_lock);
|
|
list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) {
|
|
struct tomoyo_no_rewrite_entry *ptr;
|
|
ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list);
|
|
if (ptr->is_deleted)
|
|
continue;
|
|
if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE "%s\n",
|
|
ptr->pattern->name)) {
|
|
done = false;
|
|
break;
|
|
}
|
|
}
|
|
up_read(&tomoyo_no_rewrite_list_lock);
|
|
return done;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_update_file_acl - Update file's read/write/execute ACL.
|
|
*
|
|
* @filename: Filename.
|
|
* @perm: Permission (between 1 to 7).
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* This is legacy support interface for older policy syntax.
|
|
* Current policy syntax uses "allow_read/write" instead of "6",
|
|
* "allow_read" instead of "4", "allow_write" instead of "2",
|
|
* "allow_execute" instead of "1".
|
|
*/
|
|
static int tomoyo_update_file_acl(const char *filename, u8 perm,
|
|
struct tomoyo_domain_info * const domain,
|
|
const bool is_delete)
|
|
{
|
|
if (perm > 7 || !perm) {
|
|
printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n",
|
|
__func__, perm, filename);
|
|
return -EINVAL;
|
|
}
|
|
if (filename[0] != '@' && tomoyo_strendswith(filename, "/"))
|
|
/*
|
|
* Only 'allow_mkdir' and 'allow_rmdir' are valid for
|
|
* directory permissions.
|
|
*/
|
|
return 0;
|
|
if (perm & 4)
|
|
tomoyo_update_single_path_acl(TOMOYO_TYPE_READ_ACL, filename,
|
|
domain, is_delete);
|
|
if (perm & 2)
|
|
tomoyo_update_single_path_acl(TOMOYO_TYPE_WRITE_ACL, filename,
|
|
domain, is_delete);
|
|
if (perm & 1)
|
|
tomoyo_update_single_path_acl(TOMOYO_TYPE_EXECUTE_ACL,
|
|
filename, domain, is_delete);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_single_path_acl2 - Check permission for single path operation.
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @filename: Filename to check.
|
|
* @perm: Permission.
|
|
* @may_use_pattern: True if patterned ACL is permitted.
|
|
*
|
|
* Returns 0 on success, -EPERM otherwise.
|
|
*/
|
|
static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info *
|
|
domain,
|
|
const struct tomoyo_path_info *
|
|
filename,
|
|
const u16 perm,
|
|
const bool may_use_pattern)
|
|
{
|
|
struct tomoyo_acl_info *ptr;
|
|
int error = -EPERM;
|
|
|
|
down_read(&tomoyo_domain_acl_info_list_lock);
|
|
list_for_each_entry(ptr, &domain->acl_info_list, list) {
|
|
struct tomoyo_single_path_acl_record *acl;
|
|
if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
|
|
continue;
|
|
acl = container_of(ptr, struct tomoyo_single_path_acl_record,
|
|
head);
|
|
if (!(acl->perm & perm))
|
|
continue;
|
|
if (may_use_pattern || !acl->filename->is_patterned) {
|
|
if (!tomoyo_path_matches_pattern(filename,
|
|
acl->filename))
|
|
continue;
|
|
} else {
|
|
continue;
|
|
}
|
|
error = 0;
|
|
break;
|
|
}
|
|
up_read(&tomoyo_domain_acl_info_list_lock);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_file_acl - Check permission for opening files.
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @filename: Filename to check.
|
|
* @operation: Mode ("read" or "write" or "read/write" or "execute").
|
|
*
|
|
* Returns 0 on success, -EPERM otherwise.
|
|
*/
|
|
static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain,
|
|
const struct tomoyo_path_info *filename,
|
|
const u8 operation)
|
|
{
|
|
u16 perm = 0;
|
|
|
|
if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
|
|
return 0;
|
|
if (operation == 6)
|
|
perm = 1 << TOMOYO_TYPE_READ_WRITE_ACL;
|
|
else if (operation == 4)
|
|
perm = 1 << TOMOYO_TYPE_READ_ACL;
|
|
else if (operation == 2)
|
|
perm = 1 << TOMOYO_TYPE_WRITE_ACL;
|
|
else if (operation == 1)
|
|
perm = 1 << TOMOYO_TYPE_EXECUTE_ACL;
|
|
else
|
|
BUG();
|
|
return tomoyo_check_single_path_acl2(domain, filename, perm,
|
|
operation != 1);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_file_perm2 - Check permission for opening files.
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @filename: Filename to check.
|
|
* @perm: Mode ("read" or "write" or "read/write" or "execute").
|
|
* @operation: Operation name passed used for verbose mode.
|
|
* @mode: Access control mode.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain,
|
|
const struct tomoyo_path_info *filename,
|
|
const u8 perm, const char *operation,
|
|
const u8 mode)
|
|
{
|
|
const bool is_enforce = (mode == 3);
|
|
const char *msg = "<unknown>";
|
|
int error = 0;
|
|
|
|
if (!filename)
|
|
return 0;
|
|
error = tomoyo_check_file_acl(domain, filename, perm);
|
|
if (error && perm == 4 &&
|
|
(domain->flags & TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ) == 0
|
|
&& tomoyo_is_globally_readable_file(filename))
|
|
error = 0;
|
|
if (perm == 6)
|
|
msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL);
|
|
else if (perm == 4)
|
|
msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL);
|
|
else if (perm == 2)
|
|
msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL);
|
|
else if (perm == 1)
|
|
msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL);
|
|
else
|
|
BUG();
|
|
if (!error)
|
|
return 0;
|
|
if (tomoyo_verbose_mode(domain))
|
|
printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied "
|
|
"for %s\n", tomoyo_get_msg(is_enforce), msg, operation,
|
|
filename->name, tomoyo_get_last_name(domain));
|
|
if (is_enforce)
|
|
return error;
|
|
if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) {
|
|
/* Don't use patterns for execute permission. */
|
|
const struct tomoyo_path_info *patterned_file = (perm != 1) ?
|
|
tomoyo_get_file_pattern(filename) : filename;
|
|
tomoyo_update_file_acl(patterned_file->name, perm,
|
|
domain, false);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_file_policy - Update file related list.
|
|
*
|
|
* @data: String to parse.
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
|
|
const bool is_delete)
|
|
{
|
|
char *filename = strchr(data, ' ');
|
|
char *filename2;
|
|
unsigned int perm;
|
|
u8 type;
|
|
|
|
if (!filename)
|
|
return -EINVAL;
|
|
*filename++ = '\0';
|
|
if (sscanf(data, "%u", &perm) == 1)
|
|
return tomoyo_update_file_acl(filename, (u8) perm, domain,
|
|
is_delete);
|
|
if (strncmp(data, "allow_", 6))
|
|
goto out;
|
|
data += 6;
|
|
for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) {
|
|
if (strcmp(data, tomoyo_sp_keyword[type]))
|
|
continue;
|
|
return tomoyo_update_single_path_acl(type, filename,
|
|
domain, is_delete);
|
|
}
|
|
filename2 = strchr(filename, ' ');
|
|
if (!filename2)
|
|
goto out;
|
|
*filename2++ = '\0';
|
|
for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) {
|
|
if (strcmp(data, tomoyo_dp_keyword[type]))
|
|
continue;
|
|
return tomoyo_update_double_path_acl(type, filename, filename2,
|
|
domain, is_delete);
|
|
}
|
|
out:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list.
|
|
*
|
|
* @type: Type of operation.
|
|
* @filename: Filename.
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_update_single_path_acl(const u8 type, const char *filename,
|
|
struct tomoyo_domain_info *
|
|
const domain, const bool is_delete)
|
|
{
|
|
static const u16 rw_mask =
|
|
(1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL);
|
|
const struct tomoyo_path_info *saved_filename;
|
|
struct tomoyo_acl_info *ptr;
|
|
struct tomoyo_single_path_acl_record *acl;
|
|
int error = -ENOMEM;
|
|
const u16 perm = 1 << type;
|
|
|
|
if (!domain)
|
|
return -EINVAL;
|
|
if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__))
|
|
return -EINVAL;
|
|
saved_filename = tomoyo_save_name(filename);
|
|
if (!saved_filename)
|
|
return -ENOMEM;
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_domain_acl_info_list_lock);
|
|
if (is_delete)
|
|
goto delete;
|
|
list_for_each_entry(ptr, &domain->acl_info_list, list) {
|
|
if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
|
|
continue;
|
|
acl = container_of(ptr, struct tomoyo_single_path_acl_record,
|
|
head);
|
|
if (acl->filename != saved_filename)
|
|
continue;
|
|
/* Special case. Clear all bits if marked as deleted. */
|
|
if (ptr->type & TOMOYO_ACL_DELETED)
|
|
acl->perm = 0;
|
|
acl->perm |= perm;
|
|
if ((acl->perm & rw_mask) == rw_mask)
|
|
acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL;
|
|
else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))
|
|
acl->perm |= rw_mask;
|
|
ptr->type &= ~TOMOYO_ACL_DELETED;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
/* Not found. Append it to the tail. */
|
|
acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_SINGLE_PATH_ACL);
|
|
if (!acl)
|
|
goto out;
|
|
acl->perm = perm;
|
|
if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL))
|
|
acl->perm |= rw_mask;
|
|
acl->filename = saved_filename;
|
|
list_add_tail(&acl->head.list, &domain->acl_info_list);
|
|
error = 0;
|
|
goto out;
|
|
delete:
|
|
error = -ENOENT;
|
|
list_for_each_entry(ptr, &domain->acl_info_list, list) {
|
|
if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
|
|
continue;
|
|
acl = container_of(ptr, struct tomoyo_single_path_acl_record,
|
|
head);
|
|
if (acl->filename != saved_filename)
|
|
continue;
|
|
acl->perm &= ~perm;
|
|
if ((acl->perm & rw_mask) != rw_mask)
|
|
acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL);
|
|
else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)))
|
|
acl->perm &= ~rw_mask;
|
|
if (!acl->perm)
|
|
ptr->type |= TOMOYO_ACL_DELETED;
|
|
error = 0;
|
|
break;
|
|
}
|
|
out:
|
|
up_write(&tomoyo_domain_acl_info_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list.
|
|
*
|
|
* @type: Type of operation.
|
|
* @filename1: First filename.
|
|
* @filename2: Second filename.
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_update_double_path_acl(const u8 type, const char *filename1,
|
|
const char *filename2,
|
|
struct tomoyo_domain_info *
|
|
const domain, const bool is_delete)
|
|
{
|
|
const struct tomoyo_path_info *saved_filename1;
|
|
const struct tomoyo_path_info *saved_filename2;
|
|
struct tomoyo_acl_info *ptr;
|
|
struct tomoyo_double_path_acl_record *acl;
|
|
int error = -ENOMEM;
|
|
const u8 perm = 1 << type;
|
|
|
|
if (!domain)
|
|
return -EINVAL;
|
|
if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) ||
|
|
!tomoyo_is_correct_path(filename2, 0, 0, 0, __func__))
|
|
return -EINVAL;
|
|
saved_filename1 = tomoyo_save_name(filename1);
|
|
saved_filename2 = tomoyo_save_name(filename2);
|
|
if (!saved_filename1 || !saved_filename2)
|
|
return -ENOMEM;
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_domain_acl_info_list_lock);
|
|
if (is_delete)
|
|
goto delete;
|
|
list_for_each_entry(ptr, &domain->acl_info_list, list) {
|
|
if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
|
|
continue;
|
|
acl = container_of(ptr, struct tomoyo_double_path_acl_record,
|
|
head);
|
|
if (acl->filename1 != saved_filename1 ||
|
|
acl->filename2 != saved_filename2)
|
|
continue;
|
|
/* Special case. Clear all bits if marked as deleted. */
|
|
if (ptr->type & TOMOYO_ACL_DELETED)
|
|
acl->perm = 0;
|
|
acl->perm |= perm;
|
|
ptr->type &= ~TOMOYO_ACL_DELETED;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
/* Not found. Append it to the tail. */
|
|
acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_DOUBLE_PATH_ACL);
|
|
if (!acl)
|
|
goto out;
|
|
acl->perm = perm;
|
|
acl->filename1 = saved_filename1;
|
|
acl->filename2 = saved_filename2;
|
|
list_add_tail(&acl->head.list, &domain->acl_info_list);
|
|
error = 0;
|
|
goto out;
|
|
delete:
|
|
error = -ENOENT;
|
|
list_for_each_entry(ptr, &domain->acl_info_list, list) {
|
|
if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
|
|
continue;
|
|
acl = container_of(ptr, struct tomoyo_double_path_acl_record,
|
|
head);
|
|
if (acl->filename1 != saved_filename1 ||
|
|
acl->filename2 != saved_filename2)
|
|
continue;
|
|
acl->perm &= ~perm;
|
|
if (!acl->perm)
|
|
ptr->type |= TOMOYO_ACL_DELETED;
|
|
error = 0;
|
|
break;
|
|
}
|
|
out:
|
|
up_write(&tomoyo_domain_acl_info_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_single_path_acl - Check permission for single path operation.
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @type: Type of operation.
|
|
* @filename: Filename to check.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain,
|
|
const u8 type,
|
|
const struct tomoyo_path_info *filename)
|
|
{
|
|
if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
|
|
return 0;
|
|
return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_double_path_acl - Check permission for double path operation.
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @type: Type of operation.
|
|
* @filename1: First filename to check.
|
|
* @filename2: Second filename to check.
|
|
*
|
|
* Returns 0 on success, -EPERM otherwise.
|
|
*/
|
|
static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain,
|
|
const u8 type,
|
|
const struct tomoyo_path_info *
|
|
filename1,
|
|
const struct tomoyo_path_info *
|
|
filename2)
|
|
{
|
|
struct tomoyo_acl_info *ptr;
|
|
const u8 perm = 1 << type;
|
|
int error = -EPERM;
|
|
|
|
if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
|
|
return 0;
|
|
down_read(&tomoyo_domain_acl_info_list_lock);
|
|
list_for_each_entry(ptr, &domain->acl_info_list, list) {
|
|
struct tomoyo_double_path_acl_record *acl;
|
|
if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
|
|
continue;
|
|
acl = container_of(ptr, struct tomoyo_double_path_acl_record,
|
|
head);
|
|
if (!(acl->perm & perm))
|
|
continue;
|
|
if (!tomoyo_path_matches_pattern(filename1, acl->filename1))
|
|
continue;
|
|
if (!tomoyo_path_matches_pattern(filename2, acl->filename2))
|
|
continue;
|
|
error = 0;
|
|
break;
|
|
}
|
|
up_read(&tomoyo_domain_acl_info_list_lock);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_single_path_permission2 - Check permission for single path operation.
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @operation: Type of operation.
|
|
* @filename: Filename to check.
|
|
* @mode: Access control mode.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info *
|
|
const domain, u8 operation,
|
|
const struct tomoyo_path_info *
|
|
filename, const u8 mode)
|
|
{
|
|
const char *msg;
|
|
int error;
|
|
const bool is_enforce = (mode == 3);
|
|
|
|
if (!mode)
|
|
return 0;
|
|
next:
|
|
error = tomoyo_check_single_path_acl(domain, operation, filename);
|
|
msg = tomoyo_sp2keyword(operation);
|
|
if (!error)
|
|
goto ok;
|
|
if (tomoyo_verbose_mode(domain))
|
|
printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n",
|
|
tomoyo_get_msg(is_enforce), msg, filename->name,
|
|
tomoyo_get_last_name(domain));
|
|
if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) {
|
|
const char *name = tomoyo_get_file_pattern(filename)->name;
|
|
tomoyo_update_single_path_acl(operation, name, domain, false);
|
|
}
|
|
if (!is_enforce)
|
|
error = 0;
|
|
ok:
|
|
/*
|
|
* Since "allow_truncate" doesn't imply "allow_rewrite" permission,
|
|
* we need to check "allow_rewrite" permission if the filename is
|
|
* specified by "deny_rewrite" keyword.
|
|
*/
|
|
if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL &&
|
|
tomoyo_is_no_rewrite_file(filename)) {
|
|
operation = TOMOYO_TYPE_REWRITE_ACL;
|
|
goto next;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_file_perm - Check permission for sysctl()'s "read" and "write".
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @filename: Filename to check.
|
|
* @perm: Mode ("read" or "write" or "read/write").
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_check_file_perm(struct tomoyo_domain_info *domain,
|
|
const char *filename, const u8 perm)
|
|
{
|
|
struct tomoyo_path_info name;
|
|
const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
|
|
|
|
if (!mode)
|
|
return 0;
|
|
name.name = filename;
|
|
tomoyo_fill_path_info(&name);
|
|
return tomoyo_check_file_perm2(domain, &name, perm, "sysctl", mode);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_exec_perm - Check permission for "execute".
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @filename: Check permission for "execute".
|
|
* @tmp: Buffer for temporary use.
|
|
*
|
|
* Returns 0 on success, negativevalue otherwise.
|
|
*/
|
|
int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
|
|
const struct tomoyo_path_info *filename,
|
|
struct tomoyo_page_buffer *tmp)
|
|
{
|
|
const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
|
|
|
|
if (!mode)
|
|
return 0;
|
|
return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_open_permission - Check permission for "read" and "write".
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @path: Pointer to "struct path".
|
|
* @flag: Flags for open().
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
|
|
struct path *path, const int flag)
|
|
{
|
|
const u8 acc_mode = ACC_MODE(flag);
|
|
int error = -ENOMEM;
|
|
struct tomoyo_path_info *buf;
|
|
const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
|
|
const bool is_enforce = (mode == 3);
|
|
|
|
if (!mode || !path->mnt)
|
|
return 0;
|
|
if (acc_mode == 0)
|
|
return 0;
|
|
if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))
|
|
/*
|
|
* I don't check directories here because mkdir() and rmdir()
|
|
* don't call me.
|
|
*/
|
|
return 0;
|
|
buf = tomoyo_get_path(path);
|
|
if (!buf)
|
|
goto out;
|
|
error = 0;
|
|
/*
|
|
* If the filename is specified by "deny_rewrite" keyword,
|
|
* we need to check "allow_rewrite" permission when the filename is not
|
|
* opened for append mode or the filename is truncated at open time.
|
|
*/
|
|
if ((acc_mode & MAY_WRITE) &&
|
|
((flag & O_TRUNC) || !(flag & O_APPEND)) &&
|
|
(tomoyo_is_no_rewrite_file(buf))) {
|
|
error = tomoyo_check_single_path_permission2(domain,
|
|
TOMOYO_TYPE_REWRITE_ACL,
|
|
buf, mode);
|
|
}
|
|
if (!error)
|
|
error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open",
|
|
mode);
|
|
if (!error && (flag & O_TRUNC))
|
|
error = tomoyo_check_single_path_permission2(domain,
|
|
TOMOYO_TYPE_TRUNCATE_ACL,
|
|
buf, mode);
|
|
out:
|
|
tomoyo_free(buf);
|
|
if (!is_enforce)
|
|
error = 0;
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate" and "symlink".
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @operation: Type of operation.
|
|
* @path: Pointer to "struct path".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain,
|
|
const u8 operation, struct path *path)
|
|
{
|
|
int error = -ENOMEM;
|
|
struct tomoyo_path_info *buf;
|
|
const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
|
|
const bool is_enforce = (mode == 3);
|
|
|
|
if (!mode || !path->mnt)
|
|
return 0;
|
|
buf = tomoyo_get_path(path);
|
|
if (!buf)
|
|
goto out;
|
|
switch (operation) {
|
|
case TOMOYO_TYPE_MKDIR_ACL:
|
|
case TOMOYO_TYPE_RMDIR_ACL:
|
|
if (!buf->is_dir) {
|
|
/*
|
|
* tomoyo_get_path() reserves space for appending "/."
|
|
*/
|
|
strcat((char *) buf->name, "/");
|
|
tomoyo_fill_path_info(buf);
|
|
}
|
|
}
|
|
error = tomoyo_check_single_path_permission2(domain, operation, buf,
|
|
mode);
|
|
out:
|
|
tomoyo_free(buf);
|
|
if (!is_enforce)
|
|
error = 0;
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_rewrite_permission - Check permission for "rewrite".
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @filp: Pointer to "struct file".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
|
|
struct file *filp)
|
|
{
|
|
int error = -ENOMEM;
|
|
const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
|
|
const bool is_enforce = (mode == 3);
|
|
struct tomoyo_path_info *buf;
|
|
|
|
if (!mode || !filp->f_path.mnt)
|
|
return 0;
|
|
buf = tomoyo_get_path(&filp->f_path);
|
|
if (!buf)
|
|
goto out;
|
|
if (!tomoyo_is_no_rewrite_file(buf)) {
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
error = tomoyo_check_single_path_permission2(domain,
|
|
TOMOYO_TYPE_REWRITE_ACL,
|
|
buf, mode);
|
|
out:
|
|
tomoyo_free(buf);
|
|
if (!is_enforce)
|
|
error = 0;
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_2path_perm - Check permission for "rename" and "link".
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @operation: Type of operation.
|
|
* @path1: Pointer to "struct path".
|
|
* @path2: Pointer to "struct path".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain,
|
|
const u8 operation, struct path *path1,
|
|
struct path *path2)
|
|
{
|
|
int error = -ENOMEM;
|
|
struct tomoyo_path_info *buf1, *buf2;
|
|
const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
|
|
const bool is_enforce = (mode == 3);
|
|
const char *msg;
|
|
|
|
if (!mode || !path1->mnt || !path2->mnt)
|
|
return 0;
|
|
buf1 = tomoyo_get_path(path1);
|
|
buf2 = tomoyo_get_path(path2);
|
|
if (!buf1 || !buf2)
|
|
goto out;
|
|
{
|
|
struct dentry *dentry = path1->dentry;
|
|
if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
|
|
/*
|
|
* tomoyo_get_path() reserves space for appending "/."
|
|
*/
|
|
if (!buf1->is_dir) {
|
|
strcat((char *) buf1->name, "/");
|
|
tomoyo_fill_path_info(buf1);
|
|
}
|
|
if (!buf2->is_dir) {
|
|
strcat((char *) buf2->name, "/");
|
|
tomoyo_fill_path_info(buf2);
|
|
}
|
|
}
|
|
}
|
|
error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2);
|
|
msg = tomoyo_dp2keyword(operation);
|
|
if (!error)
|
|
goto out;
|
|
if (tomoyo_verbose_mode(domain))
|
|
printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' "
|
|
"denied for %s\n", tomoyo_get_msg(is_enforce),
|
|
msg, buf1->name, buf2->name,
|
|
tomoyo_get_last_name(domain));
|
|
if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) {
|
|
const char *name1 = tomoyo_get_file_pattern(buf1)->name;
|
|
const char *name2 = tomoyo_get_file_pattern(buf2)->name;
|
|
tomoyo_update_double_path_acl(operation, name1, name2, domain,
|
|
false);
|
|
}
|
|
out:
|
|
tomoyo_free(buf1);
|
|
tomoyo_free(buf2);
|
|
if (!is_enforce)
|
|
error = 0;
|
|
return error;
|
|
}
|