/* proc.c: proc files for key database enumeration
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/errno.h>
#include "internal.h"
#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
static int proc_keys_open(struct inode *inode, struct file *file);
static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
static void proc_keys_stop(struct seq_file *p, void *v);
static int proc_keys_show(struct seq_file *m, void *v);
static const struct seq_operations proc_keys_ops = {
.start = proc_keys_start,
.next = proc_keys_next,
.stop = proc_keys_stop,
.show = proc_keys_show,
};
static const struct file_operations proc_keys_fops = {
.open = proc_keys_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#endif
static int proc_key_users_open(struct inode *inode, struct file *file);
static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
static void proc_key_users_stop(struct seq_file *p, void *v);
static int proc_key_users_show(struct seq_file *m, void *v);
static const struct seq_operations proc_key_users_ops = {
.start = proc_key_users_start,
.next = proc_key_users_next,
.stop = proc_key_users_stop,
.show = proc_key_users_show,
};
static const struct file_operations proc_key_users_fops = {
.open = proc_key_users_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
/*****************************************************************************/
/*
* declare the /proc files
*/
static int __init key_proc_init(void)
{
struct proc_dir_entry *p;
#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
p = proc_create("keys", 0, NULL, &proc_keys_fops);
if (!p)
panic("Cannot create /proc/keys\n");
#endif
p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
if (!p)
panic("Cannot create /proc/key-users\n");
return 0;
} /* end key_proc_init() */
__initcall(key_proc_init);
/*****************************************************************************/
/*
* implement "/proc/keys" to provides a list of the keys on the system
*/
#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
static int proc_keys_open(struct inode *inode, struct file *file)
{
return seq_open(file, &proc_keys_ops);
}
static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
{
struct rb_node *_p;
loff_t pos = *_pos;
spin_lock(&key_serial_lock);
_p = rb_first(&key_serial_tree);
while (pos > 0 && _p) {
pos--;
_p = rb_next(_p);
}
return _p;
}
static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
{
(*_pos)++;
return rb_next((struct rb_node *) v);
}
static void proc_keys_stop(struct seq_file *p, void *v)
{
spin_unlock(&key_serial_lock);
}
static int proc_keys_show(struct seq_file *m, void *v)
{
struct rb_node *_p = v;
struct key *key = rb_entry(_p, struct key, serial_node);
struct timespec now;
unsigned long timo;
char xbuf[12];
int rc;
/* check whether the current task is allowed to view the key (assuming
* non-possession)
* - the caller holds a spinlock, and thus the RCU read lock, making our
* access to __current_cred() safe
*/
rc = key_task_permission(make_key_ref(key, 0), current_cred(),
KEY_VIEW);
if (rc < 0)
return 0;
now = current_kernel_time();
rcu_read_lock();
/* come up with a suitable timeout value */
if (key->expiry == 0) {
memcpy(xbuf, "perm", 5);
}
else if (now.tv_sec >= key->expiry) {
memcpy(xbuf, "expd", 5);
}
else {
timo = key->expiry - now.tv_sec;
if (timo < 60)
sprintf(xbuf, "%lus", timo);
else if (timo < 60*60)
sprintf(xbuf, "%lum", timo / 60);
else if (timo < 60*60*24)
sprintf(xbuf, "%luh", timo / (60*60));
else if (timo < 60*60*24*7)
sprintf(xbuf, "%lud", timo / (60*60*24));
else
sprintf(xbuf, "%luw", timo / (60*60*24*7));
}
#define showflag(KEY, LETTER, FLAG) \
(test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
key->serial,
showflag(key, 'I', KEY_FLAG_INSTANTIATED),
showflag(key, 'R', KEY_FLAG_REVOKED),
showflag(key, 'D', KEY_FLAG_DEAD),
showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
showflag(key, 'N', KEY_FLAG_NEGATIVE),
atomic_read(&key->usage),
xbuf,
key->perm,
key->uid,
key->gid,
key->type->name);
#undef showflag
if (key->type->describe)
key->type->describe(key, m);
seq_putc(m, '\n');
rcu_read_unlock();
return 0;
}
#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
/*****************************************************************************/
/*
* implement "/proc/key-users" to provides a list of the key users
*/
static int proc_key_users_open(struct inode *inode, struct file *file)
{
return seq_open(file, &proc_key_users_ops);
}
static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
{
struct rb_node *_p;
loff_t pos = *_pos;
spin_lock(&key_user_lock);
_p = rb_first(&key_user_tree);
while (pos > 0 && _p) {
pos--;
_p = rb_next(_p);
}
return _p;
}
static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
{
(*_pos)++;
return rb_next((struct rb_node *) v);
}
static void proc_key_users_stop(struct seq_file *p, void *v)
{
spin_unlock(&key_user_lock);
}
static int proc_key_users_show(struct seq_file *m, void *v)
{
struct rb_node *_p = v;
struct key_user *user = rb_entry(_p, struct key_user, node);
unsigned maxkeys = (user->uid == 0) ?
key_quota_root_maxkeys : key_quota_maxkeys;
unsigned maxbytes = (user->uid == 0) ?
key_quota_root_maxbytes : key_quota_maxbytes;
seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
user->uid,
atomic_read(&user->usage),
atomic_read(&user->nkeys),
atomic_read(&user->nikeys),
user->qnkeys,
maxkeys,
user->qnbytes,
maxbytes);
return 0;
}
