[linux-2.6-block.git] / security / keys / proc.c

/* 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 struct rb_node *__key_serial_next(struct rb_node *n)
{
	while (n) {
		struct key *key = rb_entry(n, struct key, serial_node);
		if (key->user->user_ns == current_user_ns())
			break;
		n = rb_next(n);
	}
	return n;
}

static struct rb_node *key_serial_next(struct rb_node *n)
{
	return __key_serial_next(rb_next(n));
}

static struct rb_node *key_serial_first(struct rb_root *r)
{
	struct rb_node *n = rb_first(r);
	return __key_serial_next(n);
}

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)
	__acquires(key_serial_lock)
{
	struct rb_node *_p;
	loff_t pos = *_pos;

	spin_lock(&key_serial_lock);

	_p = key_serial_first(&key_serial_tree);
	while (pos > 0 && _p) {
		pos--;
		_p = key_serial_next(_p);
	}

	return _p;

}

static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
{
	(*_pos)++;
	return key_serial_next((struct rb_node *) v);

}

static void proc_keys_stop(struct seq_file *p, void *v)
	__releases(key_serial_lock)
{
	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 */

static struct rb_node *__key_user_next(struct rb_node *n)
{
	while (n) {
		struct key_user *user = rb_entry(n, struct key_user, node);
		if (user->user_ns == current_user_ns())
			break;
		n = rb_next(n);
	}
	return n;
}

static struct rb_node *key_user_next(struct rb_node *n)
{
	return __key_user_next(rb_next(n));
}

static struct rb_node *key_user_first(struct rb_root *r)
{
	struct rb_node *n = rb_first(r);
	return __key_user_next(n);
}
/*****************************************************************************/
/*
 * 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)
	__acquires(key_user_lock)
{
	struct rb_node *_p;
	loff_t pos = *_pos;

	spin_lock(&key_user_lock);

	_p = key_user_first(&key_user_tree);
	while (pos > 0 && _p) {
		pos--;
		_p = key_user_next(_p);
	}

	return _p;

}

static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
{
	(*_pos)++;
	return key_user_next((struct rb_node *) v);

}

static void proc_key_users_stop(struct seq_file *p, void *v)
	__releases(key_user_lock)
{
	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;

}
Commit	Line	Data
1da177e4 LT	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
1996a109	29	static const struct seq_operations proc_keys_ops = {
1da177e4 LT	30	.start = proc_keys_start,
	31	.next = proc_keys_next,
	32	.stop = proc_keys_stop,
	33	.show = proc_keys_show,
	34	};
	35
9c2e08c5	36	static const struct file_operations proc_keys_fops = {
1da177e4 LT	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
1996a109	50	static const struct seq_operations proc_key_users_ops = {
1da177e4 LT	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
9c2e08c5	57	static const struct file_operations proc_key_users_fops = {
1da177e4 LT	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
da91d2ef	73	p = proc_create("keys", 0, NULL, &proc_keys_fops);
1da177e4 LT	74	if (!p)
1da177e4 LT	75	panic("Cannot create /proc/keys\n");
1da177e4 LT	76	#endif
1da177e4 LT	77
da91d2ef	78	p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
1da177e4 LT	79	if (!p)
	80	panic("Cannot create /proc/key-users\n");
	81
1da177e4 LT	82	return 0;
	83
	84	} /* end key_proc_init() */
	85
	86	__initcall(key_proc_init);
	87
	88	/*****************************************************************************/
	89	/*
	90	* implement "/proc/keys" to provides a list of the keys on the system
	91	*/
	92	#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
	93
454804ab SH	94	static struct rb_node __key_serial_next(struct rb_node n)
	95	{
	96	while (n) {
	97	struct key *key = rb_entry(n, struct key, serial_node);
	98	if (key->user->user_ns == current_user_ns())
	99	break;
	100	n = rb_next(n);
	101	}
	102	return n;
	103	}
	104
	105	static struct rb_node key_serial_next(struct rb_node n)
	106	{
	107	return __key_serial_next(rb_next(n));
	108	}
	109
	110	static struct rb_node key_serial_first(struct rb_root r)
	111	{
	112	struct rb_node *n = rb_first(r);
	113	return __key_serial_next(n);
	114	}
	115
1da177e4 LT	116	static int proc_keys_open(struct inode inode, struct file file)
	117	{
	118	return seq_open(file, &proc_keys_ops);
	119
	120	}
	121
	122	static void proc_keys_start(struct seq_file p, loff_t *_pos)
86abcf9c	123	__acquires(key_serial_lock)
1da177e4 LT	124	{
	125	struct rb_node *_p;
	126	loff_t pos = *_pos;
	127
	128	spin_lock(&key_serial_lock);
	129
454804ab	130	_p = key_serial_first(&key_serial_tree);
1da177e4 LT	131	while (pos > 0 && _p) {
1da177e4 LT	132	pos--;
454804ab	133	_p = key_serial_next(_p);
1da177e4 LT	134	}
	135
	136	return _p;
	137
	138	}
	139
	140	static void proc_keys_next(struct seq_file p, void v, loff_t _pos)
	141	{
	142	(*_pos)++;
454804ab	143	return key_serial_next((struct rb_node *) v);
1da177e4 LT	144
	145	}
	146
	147	static void proc_keys_stop(struct seq_file p, void v)
86abcf9c	148	__releases(key_serial_lock)
1da177e4 LT	149	{
	150	spin_unlock(&key_serial_lock);
	151	}
	152
	153	static int proc_keys_show(struct seq_file m, void v)
	154	{
	155	struct rb_node *_p = v;
	156	struct key *key = rb_entry(_p, struct key, serial_node);
	157	struct timespec now;
	158	unsigned long timo;
	159	char xbuf[12];
06ec7be5 ML	160	int rc;
	161
	162	/* check whether the current task is allowed to view the key (assuming
d84f4f99 DH	163	* non-possession)
	164	* - the caller holds a spinlock, and thus the RCU read lock, making our
	165	* access to __current_cred() safe
	166	*/
	167	rc = key_task_permission(make_key_ref(key, 0), current_cred(),
	168	KEY_VIEW);
06ec7be5 ML	169	if (rc < 0)
06ec7be5 ML	170	return 0;
1da177e4 LT	171
	172	now = current_kernel_time();
	173
76d8aeab	174	rcu_read_lock();
1da177e4 LT	175
	176	/* come up with a suitable timeout value */
	177	if (key->expiry == 0) {
	178	memcpy(xbuf, "perm", 5);
	179	}
	180	else if (now.tv_sec >= key->expiry) {
	181	memcpy(xbuf, "expd", 5);
	182	}
	183	else {
	184	timo = key->expiry - now.tv_sec;
	185
	186	if (timo < 60)
	187	sprintf(xbuf, "%lus", timo);
	188	else if (timo < 60*60)
	189	sprintf(xbuf, "%lum", timo / 60);
	190	else if (timo < 606024)
	191	sprintf(xbuf, "%luh", timo / (60*60));
	192	else if (timo < 606024*7)
	193	sprintf(xbuf, "%lud", timo / (606024));
	194	else
	195	sprintf(xbuf, "%luw", timo / (606024*7));
	196	}
	197
76d8aeab DH	198	#define showflag(KEY, LETTER, FLAG) \
	199	(test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
	200
664cceb0	201	seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
1da177e4	202	key->serial,
76d8aeab DH	203	showflag(key, 'I', KEY_FLAG_INSTANTIATED),
	204	showflag(key, 'R', KEY_FLAG_REVOKED),
	205	showflag(key, 'D', KEY_FLAG_DEAD),
	206	showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
	207	showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
	208	showflag(key, 'N', KEY_FLAG_NEGATIVE),
1da177e4 LT	209	atomic_read(&key->usage),
	210	xbuf,
	211	key->perm,
	212	key->uid,
	213	key->gid,
	214	key->type->name);
	215
76d8aeab DH	216	#undef showflag
76d8aeab DH	217
1da177e4 LT	218	if (key->type->describe)
	219	key->type->describe(key, m);
	220	seq_putc(m, '\n');
	221
76d8aeab	222	rcu_read_unlock();
1da177e4 LT	223
	224	return 0;
	225
	226	}
	227
	228	#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
	229
454804ab SH	230	static struct rb_node __key_user_next(struct rb_node n)
	231	{
	232	while (n) {
	233	struct key_user *user = rb_entry(n, struct key_user, node);
	234	if (user->user_ns == current_user_ns())
	235	break;
	236	n = rb_next(n);
	237	}
	238	return n;
	239	}
	240
	241	static struct rb_node key_user_next(struct rb_node n)
	242	{
	243	return __key_user_next(rb_next(n));
	244	}
	245
	246	static struct rb_node key_user_first(struct rb_root r)
	247	{
	248	struct rb_node *n = rb_first(r);
	249	return __key_user_next(n);
	250	}
1da177e4 LT	251	/*****************************************************************************/
	252	/*
	253	* implement "/proc/key-users" to provides a list of the key users
	254	*/
	255	static int proc_key_users_open(struct inode inode, struct file file)
	256	{
	257	return seq_open(file, &proc_key_users_ops);
	258
	259	}
	260
	261	static void proc_key_users_start(struct seq_file p, loff_t *_pos)
86abcf9c	262	__acquires(key_user_lock)
1da177e4 LT	263	{
	264	struct rb_node *_p;
	265	loff_t pos = *_pos;
	266
	267	spin_lock(&key_user_lock);
	268
454804ab	269	_p = key_user_first(&key_user_tree);
1da177e4 LT	270	while (pos > 0 && _p) {
1da177e4 LT	271	pos--;
454804ab	272	_p = key_user_next(_p);
1da177e4 LT	273	}
	274
	275	return _p;
	276
	277	}
	278
	279	static void proc_key_users_next(struct seq_file p, void v, loff_t _pos)
	280	{
	281	(*_pos)++;
454804ab	282	return key_user_next((struct rb_node *) v);
1da177e4 LT	283
	284	}
	285
	286	static void proc_key_users_stop(struct seq_file p, void v)
86abcf9c	287	__releases(key_user_lock)
1da177e4 LT	288	{
	289	spin_unlock(&key_user_lock);
	290	}
	291
	292	static int proc_key_users_show(struct seq_file m, void v)
	293	{
	294	struct rb_node *_p = v;
	295	struct key_user *user = rb_entry(_p, struct key_user, node);
0b77f5bf DH	296	unsigned maxkeys = (user->uid == 0) ?
	297	key_quota_root_maxkeys : key_quota_maxkeys;
	298	unsigned maxbytes = (user->uid == 0) ?
	299	key_quota_root_maxbytes : key_quota_maxbytes;
1da177e4 LT	300
	301	seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
	302	user->uid,
	303	atomic_read(&user->usage),
	304	atomic_read(&user->nkeys),
	305	atomic_read(&user->nikeys),
	306	user->qnkeys,
0b77f5bf	307	maxkeys,
1da177e4	308	user->qnbytes,
0b77f5bf	309	maxbytes);
1da177e4 LT	310
	311	return 0;
	312
	313	}