security/keys/proc.c

   1 /* proc.c: proc files for key database enumeration
   2  *
   3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/sched.h>
  15 #include <linux/slab.h>
  16 #include <linux/fs.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/seq_file.h>
  19 #include <asm/errno.h>
  20 #include "internal.h"
  21
  22 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
  23 static int proc_keys_open(struct inode *inode, struct file *file);
  24 static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
  25 static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
  26 static void proc_keys_stop(struct seq_file *p, void *v);
  27 static int proc_keys_show(struct seq_file *m, void *v);
  28
  29 static struct seq_operations proc_keys_ops = {
  30         .start  = proc_keys_start,
  31         .next   = proc_keys_next,
  32         .stop   = proc_keys_stop,
  33         .show   = proc_keys_show,
  34 };
  35
  36 static struct file_operations proc_keys_fops = {
  37         .open           = proc_keys_open,
  38         .read           = seq_read,
  39         .llseek         = seq_lseek,
  40         .release        = seq_release,
  41 };
  42 #endif
  43
  44 static int proc_key_users_open(struct inode *inode, struct file *file);
  45 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
  46 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
  47 static void proc_key_users_stop(struct seq_file *p, void *v);
  48 static int proc_key_users_show(struct seq_file *m, void *v);
  49
  50 static struct seq_operations proc_key_users_ops = {
  51         .start  = proc_key_users_start,
  52         .next   = proc_key_users_next,
  53         .stop   = proc_key_users_stop,
  54         .show   = proc_key_users_show,
  55 };
  56
  57 static struct file_operations proc_key_users_fops = {
  58         .open           = proc_key_users_open,
  59         .read           = seq_read,
  60         .llseek         = seq_lseek,
  61         .release        = seq_release,
  62 };
  63
  64 /*****************************************************************************/
  65 /*
  66  * declare the /proc files
  67  */
  68 static int __init key_proc_init(void)
  69 {
  70         struct proc_dir_entry *p;
  71
  72 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
  73         p = create_proc_entry("keys", 0, NULL);
  74         if (!p)
  75                 panic("Cannot create /proc/keys\n");
  76
  77         p->proc_fops = &proc_keys_fops;
  78 #endif
  79
  80         p = create_proc_entry("key-users", 0, NULL);
  81         if (!p)
  82                 panic("Cannot create /proc/key-users\n");
  83
  84         p->proc_fops = &proc_key_users_fops;
  85
  86         return 0;
  87
  88 } /* end key_proc_init() */
  89
  90 __initcall(key_proc_init);
  91
  92 /*****************************************************************************/
  93 /*
  94  * implement "/proc/keys" to provides a list of the keys on the system
  95  */
  96 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
  97
  98 static int proc_keys_open(struct inode *inode, struct file *file)
  99 {
 100         return seq_open(file, &proc_keys_ops);
 101
 102 }
 103
 104 static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
 105 {
 106         struct rb_node *_p;
 107         loff_t pos = *_pos;
 108
 109         spin_lock(&key_serial_lock);
 110
 111         _p = rb_first(&key_serial_tree);
 112         while (pos > 0 && _p) {
 113                 pos--;
 114                 _p = rb_next(_p);
 115         }
 116
 117         return _p;
 118
 119 }
 120
 121 static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
 122 {
 123         (*_pos)++;
 124         return rb_next((struct rb_node *) v);
 125
 126 }
 127
 128 static void proc_keys_stop(struct seq_file *p, void *v)
 129 {
 130         spin_unlock(&key_serial_lock);
 131 }
 132
 133 static int proc_keys_show(struct seq_file *m, void *v)
 134 {
 135         struct rb_node *_p = v;
 136         struct key *key = rb_entry(_p, struct key, serial_node);
 137         struct timespec now;
 138         unsigned long timo;
 139         char xbuf[12];
 140
 141         now = current_kernel_time();
 142
 143         rcu_read_lock();
 144
 145         /* come up with a suitable timeout value */
 146         if (key->expiry == 0) {
 147                 memcpy(xbuf, "perm", 5);
 148         }
 149         else if (now.tv_sec >= key->expiry) {
 150                 memcpy(xbuf, "expd", 5);
 151         }
 152         else {
 153                 timo = key->expiry - now.tv_sec;
 154
 155                 if (timo < 60)
 156                         sprintf(xbuf, "%lus", timo);
 157                 else if (timo < 60*60)
 158                         sprintf(xbuf, "%lum", timo / 60);
 159                 else if (timo < 60*60*24)
 160                         sprintf(xbuf, "%luh", timo / (60*60));
 161                 else if (timo < 60*60*24*7)
 162                         sprintf(xbuf, "%lud", timo / (60*60*24));
 163                 else
 164                         sprintf(xbuf, "%luw", timo / (60*60*24*7));
 165         }
 166
 167 #define showflag(KEY, LETTER, FLAG) \
 168         (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
 169
 170         seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
 171                    key->serial,
 172                    showflag(key, 'I', KEY_FLAG_INSTANTIATED),
 173                    showflag(key, 'R', KEY_FLAG_REVOKED),
 174                    showflag(key, 'D', KEY_FLAG_DEAD),
 175                    showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
 176                    showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
 177                    showflag(key, 'N', KEY_FLAG_NEGATIVE),
 178                    atomic_read(&key->usage),
 179                    xbuf,
 180                    key->perm,
 181                    key->uid,
 182                    key->gid,
 183                    key->type->name);
 184
 185 #undef showflag
 186
 187         if (key->type->describe)
 188                 key->type->describe(key, m);
 189         seq_putc(m, '\n');
 190
 191         rcu_read_unlock();
 192
 193         return 0;
 194
 195 }
 196
 197 #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
 198
 199 /*****************************************************************************/
 200 /*
 201  * implement "/proc/key-users" to provides a list of the key users
 202  */
 203 static int proc_key_users_open(struct inode *inode, struct file *file)
 204 {
 205         return seq_open(file, &proc_key_users_ops);
 206
 207 }
 208
 209 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
 210 {
 211         struct rb_node *_p;
 212         loff_t pos = *_pos;
 213
 214         spin_lock(&key_user_lock);
 215
 216         _p = rb_first(&key_user_tree);
 217         while (pos > 0 && _p) {
 218                 pos--;
 219                 _p = rb_next(_p);
 220         }
 221
 222         return _p;
 223
 224 }
 225
 226 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
 227 {
 228         (*_pos)++;
 229         return rb_next((struct rb_node *) v);
 230
 231 }
 232
 233 static void proc_key_users_stop(struct seq_file *p, void *v)
 234 {
 235         spin_unlock(&key_user_lock);
 236 }
 237
 238 static int proc_key_users_show(struct seq_file *m, void *v)
 239 {
 240         struct rb_node *_p = v;
 241         struct key_user *user = rb_entry(_p, struct key_user, node);
 242
 243         seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
 244                    user->uid,
 245                    atomic_read(&user->usage),
 246                    atomic_read(&user->nkeys),
 247                    atomic_read(&user->nikeys),
 248                    user->qnkeys,
 249                    KEYQUOTA_MAX_KEYS,
 250                    user->qnbytes,
 251                    KEYQUOTA_MAX_BYTES
 252                    );
 253
 254         return 0;
 255
 256 }