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