LXR linux/security/tomoyo/securityfs

   1/*
   2 * security/tomoyo/common.c
   3 *
   4 * Securityfs interface for TOMOYO.
   5 *
   6 * Copyright (C) 2005-2010  NTT DATA CORPORATION
   7 */
   8
   9#include <linux/security.h>
  10#include "common.h"
  11
  12/**
  13 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
  14 *
  15 * @inode: Pointer to "struct inode".
  16 * @file:  Pointer to "struct file".
  17 *
  18 * Returns 0 on success, negative value otherwise.
  19 */
  20static int tomoyo_open(struct inode *inode, struct file *file)
  21{
  22        const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
  23                - ((u8 *) NULL);
  24        return tomoyo_open_control(key, file);
  25}
  26
  27/**
  28 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
  29 *
  30 * @inode: Pointer to "struct inode".
  31 * @file:  Pointer to "struct file".
  32 *
  33 * Returns 0 on success, negative value otherwise.
  34 */
  35static int tomoyo_release(struct inode *inode, struct file *file)
  36{
  37        return tomoyo_close_control(file);
  38}
  39
  40/**
  41 * tomoyo_poll - poll() for /proc/ccs/ interface.
  42 *
  43 * @file: Pointer to "struct file".
  44 * @wait: Pointer to "poll_table".
  45 *
  46 * Returns 0 on success, negative value otherwise.
  47 */
  48static unsigned int tomoyo_poll(struct file *file, poll_table *wait)
  49{
  50        return tomoyo_poll_control(file, wait);
  51}
  52
  53/**
  54 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
  55 *
  56 * @file:  Pointer to "struct file".
  57 * @buf:   Pointer to buffer.
  58 * @count: Size of @buf.
  59 * @ppos:  Unused.
  60 *
  61 * Returns bytes read on success, negative value otherwise.
  62 */
  63static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
  64                           loff_t *ppos)
  65{
  66        return tomoyo_read_control(file, buf, count);
  67}
  68
  69/**
  70 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
  71 *
  72 * @file:  Pointer to "struct file".
  73 * @buf:   Pointer to buffer.
  74 * @count: Size of @buf.
  75 * @ppos:  Unused.
  76 *
  77 * Returns @count on success, negative value otherwise.
  78 */
  79static ssize_t tomoyo_write(struct file *file, const char __user *buf,
  80                            size_t count, loff_t *ppos)
  81{
  82        return tomoyo_write_control(file, buf, count);
  83}
  84
  85/*
  86 * tomoyo_operations is a "struct file_operations" which is used for handling
  87 * /sys/kernel/security/tomoyo/ interface.
  88 *
  89 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
  90 * See tomoyo_io_buffer for internals.
  91 */
  92static const struct file_operations tomoyo_operations = {
  93        .open    = tomoyo_open,
  94        .release = tomoyo_release,
  95        .poll    = tomoyo_poll,
  96        .read    = tomoyo_read,
  97        .write   = tomoyo_write,
  98        .llseek  = noop_llseek,
  99};
 100
 101/**
 102 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
 103 *
 104 * @name:   The name of the interface file.
 105 * @mode:   The permission of the interface file.
 106 * @parent: The parent directory.
 107 * @key:    Type of interface.
 108 *
 109 * Returns nothing.
 110 */
 111static void __init tomoyo_create_entry(const char *name, const mode_t mode,
 112                                       struct dentry *parent, const u8 key)
 113{
 114        securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
 115                               &tomoyo_operations);
 116}
 117
 118/**
 119 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
 120 *
 121 * Returns 0.
 122 */
 123static int __init tomoyo_initerface_init(void)
 124{
 125        struct dentry *tomoyo_dir;
 126
 127        /* Don't create securityfs entries unless registered. */
 128        if (current_cred()->security != &tomoyo_kernel_domain)
 129                return 0;
 130
 131        tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
 132        tomoyo_create_entry("query",            0600, tomoyo_dir,
 133                            TOMOYO_QUERY);
 134        tomoyo_create_entry("domain_policy",    0600, tomoyo_dir,
 135                            TOMOYO_DOMAINPOLICY);
 136        tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
 137                            TOMOYO_EXCEPTIONPOLICY);
 138        tomoyo_create_entry("self_domain",      0400, tomoyo_dir,
 139                            TOMOYO_SELFDOMAIN);
 140        tomoyo_create_entry(".domain_status",   0600, tomoyo_dir,
 141                            TOMOYO_DOMAIN_STATUS);
 142        tomoyo_create_entry(".process_status",  0600, tomoyo_dir,
 143                            TOMOYO_PROCESS_STATUS);
 144        tomoyo_create_entry("meminfo",          0600, tomoyo_dir,
 145                            TOMOYO_MEMINFO);
 146        tomoyo_create_entry("profile",          0600, tomoyo_dir,
 147                            TOMOYO_PROFILE);
 148        tomoyo_create_entry("manager",          0600, tomoyo_dir,
 149                            TOMOYO_MANAGER);
 150        tomoyo_create_entry("version",          0400, tomoyo_dir,
 151                            TOMOYO_VERSION);
 152        return 0;
 153}
 154
 155fs_initcall(tomoyo_initerface_init);
 156