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 const 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 const 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 const 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 const 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 int rc; 141 142 /* check whether the current task is allowed to view the key (assuming 143 * non-possession) */ 144 rc = key_task_permission(make_key_ref(key, 0), current, KEY_VIEW); 145 if (rc < 0) 146 return 0; 147 148 now = current_kernel_time(); 149 150 rcu_read_lock(); 151 152 /* come up with a suitable timeout value */ 153 if (key->expiry == 0) { 154 memcpy(xbuf, "perm", 5); 155 } 156 else if (now.tv_sec >= key->expiry) { 157 memcpy(xbuf, "expd", 5); 158 } 159 else { 160 timo = key->expiry - now.tv_sec; 161 162 if (timo < 60) 163 sprintf(xbuf, "%lus", timo); 164 else if (timo < 60*60) 165 sprintf(xbuf, "%lum", timo / 60); 166 else if (timo < 60*60*24) 167 sprintf(xbuf, "%luh", timo / (60*60)); 168 else if (timo < 60*60*24*7) 169 sprintf(xbuf, "%lud", timo / (60*60*24)); 170 else 171 sprintf(xbuf, "%luw", timo / (60*60*24*7)); 172 } 173 174 #define showflag(KEY, LETTER, FLAG) \ 175 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-') 176 177 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ", 178 key->serial, 179 showflag(key, 'I', KEY_FLAG_INSTANTIATED), 180 showflag(key, 'R', KEY_FLAG_REVOKED), 181 showflag(key, 'D', KEY_FLAG_DEAD), 182 showflag(key, 'Q', KEY_FLAG_IN_QUOTA), 183 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT), 184 showflag(key, 'N', KEY_FLAG_NEGATIVE), 185 atomic_read(&key->usage), 186 xbuf, 187 key->perm, 188 key->uid, 189 key->gid, 190 key->type->name); 191 192 #undef showflag 193 194 if (key->type->describe) 195 key->type->describe(key, m); 196 seq_putc(m, '\n'); 197 198 rcu_read_unlock(); 199 200 return 0; 201 202 } 203 204 #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */ 205 206 /*****************************************************************************/ 207 /* 208 * implement "/proc/key-users" to provides a list of the key users 209 */ 210 static int proc_key_users_open(struct inode *inode, struct file *file) 211 { 212 return seq_open(file, &proc_key_users_ops); 213 214 } 215 216 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos) 217 { 218 struct rb_node *_p; 219 loff_t pos = *_pos; 220 221 spin_lock(&key_user_lock); 222 223 _p = rb_first(&key_user_tree); 224 while (pos > 0 && _p) { 225 pos--; 226 _p = rb_next(_p); 227 } 228 229 return _p; 230 231 } 232 233 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos) 234 { 235 (*_pos)++; 236 return rb_next((struct rb_node *) v); 237 238 } 239 240 static void proc_key_users_stop(struct seq_file *p, void *v) 241 { 242 spin_unlock(&key_user_lock); 243 } 244 245 static int proc_key_users_show(struct seq_file *m, void *v) 246 { 247 struct rb_node *_p = v; 248 struct key_user *user = rb_entry(_p, struct key_user, node); 249 250 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", 251 user->uid, 252 atomic_read(&user->usage), 253 atomic_read(&user->nkeys), 254 atomic_read(&user->nikeys), 255 user->qnkeys, 256 KEYQUOTA_MAX_KEYS, 257 user->qnbytes, 258 KEYQUOTA_MAX_BYTES 259 ); 260 261 return 0; 262 263 } 264