security/tomoyo/securityfs_if.c

   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  */
  20 static 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  */
  35 static int tomoyo_release(struct inode *inode, struct file *file)
  36 {
  37         return tomoyo_close_control(file);
  38 }
  39
  40 /**
  41  * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
  42  *
  43  * @file:  Pointer to "struct file".
  44  * @buf:   Pointer to buffer.
  45  * @count: Size of @buf.
  46  * @ppos:  Unused.
  47  *
  48  * Returns bytes read on success, negative value otherwise.
  49  */
  50 static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
  51                            loff_t *ppos)
  52 {
  53         return tomoyo_read_control(file, buf, count);
  54 }
  55
  56 /**
  57  * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
  58  *
  59  * @file:  Pointer to "struct file".
  60  * @buf:   Pointer to buffer.
  61  * @count: Size of @buf.
  62  * @ppos:  Unused.
  63  *
  64  * Returns @count on success, negative value otherwise.
  65  */
  66 static ssize_t tomoyo_write(struct file *file, const char __user *buf,
  67                             size_t count, loff_t *ppos)
  68 {
  69         return tomoyo_write_control(file, buf, count);
  70 }
  71
  72 /*
  73  * tomoyo_operations is a "struct file_operations" which is used for handling
  74  * /sys/kernel/security/tomoyo/ interface.
  75  *
  76  * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
  77  * See tomoyo_io_buffer for internals.
  78  */
  79 static const struct file_operations tomoyo_operations = {
  80         .open    = tomoyo_open,
  81         .release = tomoyo_release,
  82         .read    = tomoyo_read,
  83         .write   = tomoyo_write,
  84 };
  85
  86 /**
  87  * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
  88  *
  89  * @name:   The name of the interface file.
  90  * @mode:   The permission of the interface file.
  91  * @parent: The parent directory.
  92  * @key:    Type of interface.
  93  *
  94  * Returns nothing.
  95  */
  96 static void __init tomoyo_create_entry(const char *name, const mode_t mode,
  97                                        struct dentry *parent, const u8 key)
  98 {
  99         securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
 100                                &tomoyo_operations);
 101 }
 102
 103 /**
 104  * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
 105  *
 106  * Returns 0.
 107  */
 108 static int __init tomoyo_initerface_init(void)
 109 {
 110         struct dentry *tomoyo_dir;
 111
 112         /* Don't create securityfs entries unless registered. */
 113         if (current_cred()->security != &tomoyo_kernel_domain)
 114                 return 0;
 115
 116         tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
 117         tomoyo_create_entry("query",            0600, tomoyo_dir,
 118                             TOMOYO_QUERY);
 119         tomoyo_create_entry("domain_policy",    0600, tomoyo_dir,
 120                             TOMOYO_DOMAINPOLICY);
 121         tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
 122                             TOMOYO_EXCEPTIONPOLICY);
 123         tomoyo_create_entry("self_domain",      0400, tomoyo_dir,
 124                             TOMOYO_SELFDOMAIN);
 125         tomoyo_create_entry(".domain_status",   0600, tomoyo_dir,
 126                             TOMOYO_DOMAIN_STATUS);
 127         tomoyo_create_entry(".process_status",  0600, tomoyo_dir,
 128                             TOMOYO_PROCESS_STATUS);
 129         tomoyo_create_entry("meminfo",          0600, tomoyo_dir,
 130                             TOMOYO_MEMINFO);
 131         tomoyo_create_entry("profile",          0600, tomoyo_dir,
 132                             TOMOYO_PROFILE);
 133         tomoyo_create_entry("manager",          0600, tomoyo_dir,
 134                             TOMOYO_MANAGER);
 135         tomoyo_create_entry("version",          0400, tomoyo_dir,
 136                             TOMOYO_VERSION);
 137         return 0;
 138 }
 139
 140 fs_initcall(tomoyo_initerface_init);