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_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  */
  48 static 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  */
  63 static 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  */
  79 static 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  */
  92 static 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 };
  99
 100 /**
 101  * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
 102  *
 103  * @name:   The name of the interface file.
 104  * @mode:   The permission of the interface file.
 105  * @parent: The parent directory.
 106  * @key:    Type of interface.
 107  *
 108  * Returns nothing.
 109  */
 110 static void __init tomoyo_create_entry(const char *name, const mode_t mode,
 111                                        struct dentry *parent, const u8 key)
 112 {
 113         securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
 114                                &tomoyo_operations);
 115 }
 116
 117 /**
 118  * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
 119  *
 120  * Returns 0.
 121  */
 122 static int __init tomoyo_initerface_init(void)
 123 {
 124         struct dentry *tomoyo_dir;
 125
 126         /* Don't create securityfs entries unless registered. */
 127         if (current_cred()->security != &tomoyo_kernel_domain)
 128                 return 0;
 129
 130         tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
 131         tomoyo_create_entry("query",            0600, tomoyo_dir,
 132                             TOMOYO_QUERY);
 133         tomoyo_create_entry("domain_policy",    0600, tomoyo_dir,
 134                             TOMOYO_DOMAINPOLICY);
 135         tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
 136                             TOMOYO_EXCEPTIONPOLICY);
 137         tomoyo_create_entry("self_domain",      0400, tomoyo_dir,
 138                             TOMOYO_SELFDOMAIN);
 139         tomoyo_create_entry(".domain_status",   0600, tomoyo_dir,
 140                             TOMOYO_DOMAIN_STATUS);
 141         tomoyo_create_entry(".process_status",  0600, tomoyo_dir,
 142                             TOMOYO_PROCESS_STATUS);
 143         tomoyo_create_entry("meminfo",          0600, tomoyo_dir,
 144                             TOMOYO_MEMINFO);
 145         tomoyo_create_entry("profile",          0600, tomoyo_dir,
 146                             TOMOYO_PROFILE);
 147         tomoyo_create_entry("manager",          0600, tomoyo_dir,
 148                             TOMOYO_MANAGER);
 149         tomoyo_create_entry("version",          0400, tomoyo_dir,
 150                             TOMOYO_VERSION);
 151         return 0;
 152 }
 153
 154 fs_initcall(tomoyo_initerface_init);