[linux-2.6-block.git] / crypto / crypto_user.c

/*
 * Crypto user configuration API.
 *
 * Copyright (C) 2011 secunet Security Networks AG
 * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/cryptouser.h>
#include <linux/sched.h>
#include <net/netlink.h>
#include <linux/security.h>
#include <net/net_namespace.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
#include <crypto/internal/rng.h>
#include <crypto/akcipher.h>

#include "internal.h"

#define null_terminated(x)	(strnlen(x, sizeof(x)) < sizeof(x))

static DEFINE_MUTEX(crypto_cfg_mutex);

/* The crypto netlink socket */
static struct sock *crypto_nlsk;

struct crypto_dump_info {
	struct sk_buff *in_skb;
	struct sk_buff *out_skb;
	u32 nlmsg_seq;
	u16 nlmsg_flags;
};

static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
{
	struct crypto_alg *q, *alg = NULL;

	down_read(&crypto_alg_sem);

	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		int match = 0;

		if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
			continue;

		if (strlen(p->cru_driver_name))
			match = !strcmp(q->cra_driver_name,
					p->cru_driver_name);
		else if (!exact)
			match = !strcmp(q->cra_name, p->cru_name);

		if (!match)
			continue;

		if (unlikely(!crypto_mod_get(q)))
			continue;

		alg = q;
		break;
	}

	up_read(&crypto_alg_sem);

	return alg;
}

static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_cipher rcipher;

	strncpy(rcipher.type, "cipher", sizeof(rcipher.type));

	rcipher.blocksize = alg->cra_blocksize;
	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;

	if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
		    sizeof(struct crypto_report_cipher), &rcipher))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_comp rcomp;

	strncpy(rcomp.type, "compression", sizeof(rcomp.type));
	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
		    sizeof(struct crypto_report_comp), &rcomp))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_akcipher rakcipher;

	strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));

	if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
		    sizeof(struct crypto_report_akcipher), &rakcipher))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_one(struct crypto_alg *alg,
			     struct crypto_user_alg *ualg, struct sk_buff *skb)
{
	strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
	strncpy(ualg->cru_driver_name, alg->cra_driver_name,
		sizeof(ualg->cru_driver_name));
	strncpy(ualg->cru_module_name, module_name(alg->cra_module),
		sizeof(ualg->cru_module_name));

	ualg->cru_type = 0;
	ualg->cru_mask = 0;
	ualg->cru_flags = alg->cra_flags;
	ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);

	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
		goto nla_put_failure;
	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
		struct crypto_report_larval rl;

		strncpy(rl.type, "larval", sizeof(rl.type));
		if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
			    sizeof(struct crypto_report_larval), &rl))
			goto nla_put_failure;
		goto out;
	}

	if (alg->cra_type && alg->cra_type->report) {
		if (alg->cra_type->report(skb, alg))
			goto nla_put_failure;

		goto out;
	}

	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
	case CRYPTO_ALG_TYPE_CIPHER:
		if (crypto_report_cipher(skb, alg))
			goto nla_put_failure;

		break;
	case CRYPTO_ALG_TYPE_COMPRESS:
		if (crypto_report_comp(skb, alg))
			goto nla_put_failure;

		break;

	case CRYPTO_ALG_TYPE_AKCIPHER:
		if (crypto_report_akcipher(skb, alg))
			goto nla_put_failure;

		break;
	}

out:
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_alg(struct crypto_alg *alg,
			     struct crypto_dump_info *info)
{
	struct sk_buff *in_skb = info->in_skb;
	struct sk_buff *skb = info->out_skb;
	struct nlmsghdr *nlh;
	struct crypto_user_alg *ualg;
	int err = 0;

	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
			CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	if (!nlh) {
		err = -EMSGSIZE;
		goto out;
	}

	ualg = nlmsg_data(nlh);

	err = crypto_report_one(alg, ualg, skb);
	if (err) {
		nlmsg_cancel(skb, nlh);
		goto out;
	}

	nlmsg_end(skb, nlh);

out:
	return err;
}

static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
			 struct nlattr **attrs)
{
	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	struct crypto_alg *alg;
	struct sk_buff *skb;
	struct crypto_dump_info info;
	int err;

	if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
		return -EINVAL;

	alg = crypto_alg_match(p, 0);
	if (!alg)
		return -ENOENT;

	err = -ENOMEM;
	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
	if (!skb)
		goto drop_alg;

	info.in_skb = in_skb;
	info.out_skb = skb;
	info.nlmsg_seq = in_nlh->nlmsg_seq;
	info.nlmsg_flags = 0;

	err = crypto_report_alg(alg, &info);

drop_alg:
	crypto_mod_put(alg);

	if (err)
		return err;

	return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
}

static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct crypto_alg *alg;
	struct crypto_dump_info info;
	int err;

	if (cb->args[0])
		goto out;

	cb->args[0] = 1;

	info.in_skb = cb->skb;
	info.out_skb = skb;
	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	info.nlmsg_flags = NLM_F_MULTI;

	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
		err = crypto_report_alg(alg, &info);
		if (err)
			goto out_err;
	}

out:
	return skb->len;
out_err:
	return err;
}

static int crypto_dump_report_done(struct netlink_callback *cb)
{
	return 0;
}

static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
			     struct nlattr **attrs)
{
	struct crypto_alg *alg;
	struct crypto_user_alg *p = nlmsg_data(nlh);
	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	LIST_HEAD(list);

	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;

	if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
		return -EINVAL;

	if (priority && !strlen(p->cru_driver_name))
		return -EINVAL;

	alg = crypto_alg_match(p, 1);
	if (!alg)
		return -ENOENT;

	down_write(&crypto_alg_sem);

	crypto_remove_spawns(alg, &list, NULL);

	if (priority)
		alg->cra_priority = nla_get_u32(priority);

	up_write(&crypto_alg_sem);

	crypto_mod_put(alg);
	crypto_remove_final(&list);

	return 0;
}

static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
			  struct nlattr **attrs)
{
	struct crypto_alg *alg;
	struct crypto_user_alg *p = nlmsg_data(nlh);
	int err;

	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;

	if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
		return -EINVAL;

	alg = crypto_alg_match(p, 1);
	if (!alg)
		return -ENOENT;

	/* We can not unregister core algorithms such as aes-generic.
	 * We would loose the reference in the crypto_alg_list to this algorithm
	 * if we try to unregister. Unregistering such an algorithm without
	 * removing the module is not possible, so we restrict to crypto
	 * instances that are build from templates. */
	err = -EINVAL;
	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
		goto drop_alg;

	err = -EBUSY;
	if (atomic_read(&alg->cra_refcnt) > 2)
		goto drop_alg;

	err = crypto_unregister_instance((struct crypto_instance *)alg);

drop_alg:
	crypto_mod_put(alg);
	return err;
}

static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type,
						   u32 mask)
{
	int err;
	struct crypto_alg *alg;

	type = crypto_skcipher_type(type);
	mask = crypto_skcipher_mask(mask);

	for (;;) {
		alg = crypto_lookup_skcipher(name,  type, mask);
		if (!IS_ERR(alg))
			return alg;

		err = PTR_ERR(alg);
		if (err != -EAGAIN)
			break;
		if (signal_pending(current)) {
			err = -EINTR;
			break;
		}
	}

	return ERR_PTR(err);
}

static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type,
					       u32 mask)
{
	int err;
	struct crypto_alg *alg;

	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	type |= CRYPTO_ALG_TYPE_AEAD;
	mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	mask |= CRYPTO_ALG_TYPE_MASK;

	for (;;) {
		alg = crypto_lookup_aead(name,  type, mask);
		if (!IS_ERR(alg))
			return alg;

		err = PTR_ERR(alg);
		if (err != -EAGAIN)
			break;
		if (signal_pending(current)) {
			err = -EINTR;
			break;
		}
	}

	return ERR_PTR(err);
}

static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
			  struct nlattr **attrs)
{
	int exact = 0;
	const char *name;
	struct crypto_alg *alg;
	struct crypto_user_alg *p = nlmsg_data(nlh);
	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];

	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;

	if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
		return -EINVAL;

	if (strlen(p->cru_driver_name))
		exact = 1;

	if (priority && !exact)
		return -EINVAL;

	alg = crypto_alg_match(p, exact);
	if (alg) {
		crypto_mod_put(alg);
		return -EEXIST;
	}

	if (strlen(p->cru_driver_name))
		name = p->cru_driver_name;
	else
		name = p->cru_name;

	switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_AEAD:
		alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask);
		break;
	case CRYPTO_ALG_TYPE_GIVCIPHER:
	case CRYPTO_ALG_TYPE_BLKCIPHER:
	case CRYPTO_ALG_TYPE_ABLKCIPHER:
		alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask);
		break;
	default:
		alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
	}

	if (IS_ERR(alg))
		return PTR_ERR(alg);

	down_write(&crypto_alg_sem);

	if (priority)
		alg->cra_priority = nla_get_u32(priority);

	up_write(&crypto_alg_sem);

	crypto_mod_put(alg);

	return 0;
}

static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh,
			  struct nlattr **attrs)
{
	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;
	return crypto_del_default_rng();
}

#define MSGSIZE(type) sizeof(struct type)

static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
	[CRYPTO_MSG_NEWALG	- CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	[CRYPTO_MSG_DELALG	- CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	[CRYPTO_MSG_UPDATEALG	- CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	[CRYPTO_MSG_DELRNG	- CRYPTO_MSG_BASE] = 0,
};

static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
	[CRYPTOCFGA_PRIORITY_VAL]   = { .type = NLA_U32},
};

#undef MSGSIZE

static const struct crypto_link {
	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
	int (*dump)(struct sk_buff *, struct netlink_callback *);
	int (*done)(struct netlink_callback *);
} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
	[CRYPTO_MSG_NEWALG	- CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
	[CRYPTO_MSG_DELALG	- CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
	[CRYPTO_MSG_UPDATEALG	- CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
	[CRYPTO_MSG_GETALG	- CRYPTO_MSG_BASE] = { .doit = crypto_report,
						       .dump = crypto_dump_report,
						       .done = crypto_dump_report_done},
	[CRYPTO_MSG_DELRNG	- CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
};

static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
	const struct crypto_link *link;
	int type, err;

	type = nlh->nlmsg_type;
	if (type > CRYPTO_MSG_MAX)
		return -EINVAL;

	type -= CRYPTO_MSG_BASE;
	link = &crypto_dispatch[type];

	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
	    (nlh->nlmsg_flags & NLM_F_DUMP))) {
		struct crypto_alg *alg;
		u16 dump_alloc = 0;

		if (link->dump == NULL)
			return -EINVAL;

		list_for_each_entry(alg, &crypto_alg_list, cra_list)
			dump_alloc += CRYPTO_REPORT_MAXSIZE;

		{
			struct netlink_dump_control c = {
				.dump = link->dump,
				.done = link->done,
				.min_dump_alloc = dump_alloc,
			};
			return netlink_dump_start(crypto_nlsk, skb, nlh, &c);
		}
	}

	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
			  crypto_policy);
	if (err < 0)
		return err;

	if (link->doit == NULL)
		return -EINVAL;

	return link->doit(skb, nlh, attrs);
}

static void crypto_netlink_rcv(struct sk_buff *skb)
{
	mutex_lock(&crypto_cfg_mutex);
	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
	mutex_unlock(&crypto_cfg_mutex);
}

static int __init crypto_user_init(void)
{
	struct netlink_kernel_cfg cfg = {
		.input	= crypto_netlink_rcv,
	};

	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
	if (!crypto_nlsk)
		return -ENOMEM;

	return 0;
}

static void __exit crypto_user_exit(void)
{
	netlink_kernel_release(crypto_nlsk);
}

module_init(crypto_user_init);
module_exit(crypto_user_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
MODULE_DESCRIPTION("Crypto userspace configuration API");
MODULE_ALIAS("net-pf-16-proto-21");
Commit	Line	Data
a38f7907 SK	1	/*
	2	* Crypto user configuration API.
	3	*
	4	* Copyright (C) 2011 secunet Security Networks AG
	5	* Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms and conditions of the GNU General Public License,
	9	* version 2, as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope it will be useful, but WITHOUT
	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	14	* more details.
	15	*
	16	* You should have received a copy of the GNU General Public License along with
	17	* this program; if not, write to the Free Software Foundation, Inc.,
	18	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	19	*/
	20
	21	#include <linux/module.h>
	22	#include <linux/crypto.h>
	23	#include <linux/cryptouser.h>
1e122994	24	#include <linux/sched.h>
a38f7907 SK	25	#include <net/netlink.h>
	26	#include <linux/security.h>
	27	#include <net/net_namespace.h>
1e122994 SK	28	#include <crypto/internal/aead.h>
1e122994 SK	29	#include <crypto/internal/skcipher.h>
9aa867e4	30	#include <crypto/internal/rng.h>
3c339ab8	31	#include <crypto/akcipher.h>
1e122994	32
a38f7907 SK	33	#include "internal.h"
a38f7907 SK	34
8fd61d34 MK	35	#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
8fd61d34 MK	36
66ce0b0f	37	static DEFINE_MUTEX(crypto_cfg_mutex);
a38f7907 SK	38
	39	/* The crypto netlink socket */
	40	static struct sock *crypto_nlsk;
	41
	42	struct crypto_dump_info {
	43	struct sk_buff *in_skb;
	44	struct sk_buff *out_skb;
	45	u32 nlmsg_seq;
	46	u16 nlmsg_flags;
	47	};
	48
	49	static struct crypto_alg crypto_alg_match(struct crypto_user_alg p, int exact)
	50	{
a38f7907 SK	51	struct crypto_alg q, alg = NULL;
	52
	53	down_read(&crypto_alg_sem);
	54
a38f7907	55	list_for_each_entry(q, &crypto_alg_list, cra_list) {
e6ea64ec	56	int match = 0;
a38f7907 SK	57
	58	if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
	59	continue;
	60
	61	if (strlen(p->cru_driver_name))
	62	match = !strcmp(q->cra_driver_name,
	63	p->cru_driver_name);
	64	else if (!exact)
	65	match = !strcmp(q->cra_name, p->cru_name);
	66
016baaa1 HX	67	if (!match)
	68	continue;
	69
	70	if (unlikely(!crypto_mod_get(q)))
	71	continue;
	72
	73	alg = q;
	74	break;
a38f7907 SK	75	}
	76
	77	up_read(&crypto_alg_sem);
	78
	79	return alg;
	80	}
	81
07a5fa4a SK	82	static int crypto_report_cipher(struct sk_buff skb, struct crypto_alg alg)
	83	{
	84	struct crypto_report_cipher rcipher;
	85
9a5467bf	86	strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
07a5fa4a SK	87
	88	rcipher.blocksize = alg->cra_blocksize;
	89	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
	90	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
	91
6662df33 DM	92	if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
	93	sizeof(struct crypto_report_cipher), &rcipher))
	94	goto nla_put_failure;
07a5fa4a SK	95	return 0;
	96
	97	nla_put_failure:
	98	return -EMSGSIZE;
	99	}
	100
540b97c1 SK	101	static int crypto_report_comp(struct sk_buff skb, struct crypto_alg alg)
	102	{
	103	struct crypto_report_comp rcomp;
	104
9a5467bf	105	strncpy(rcomp.type, "compression", sizeof(rcomp.type));
6662df33 DM	106	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
	107	sizeof(struct crypto_report_comp), &rcomp))
	108	goto nla_put_failure;
540b97c1 SK	109	return 0;
	110
	111	nla_put_failure:
	112	return -EMSGSIZE;
	113	}
	114
3c339ab8 TS	115	static int crypto_report_akcipher(struct sk_buff skb, struct crypto_alg alg)
	116	{
	117	struct crypto_report_akcipher rakcipher;
	118
	119	strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
	120
	121	if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
	122	sizeof(struct crypto_report_akcipher), &rakcipher))
	123	goto nla_put_failure;
	124	return 0;
	125
	126	nla_put_failure:
	127	return -EMSGSIZE;
	128	}
	129
a38f7907 SK	130	static int crypto_report_one(struct crypto_alg *alg,
	131	struct crypto_user_alg ualg, struct sk_buff skb)
	132	{
9a5467bf MK	133	strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
	134	strncpy(ualg->cru_driver_name, alg->cra_driver_name,
	135	sizeof(ualg->cru_driver_name));
	136	strncpy(ualg->cru_module_name, module_name(alg->cra_module),
	137	sizeof(ualg->cru_module_name));
	138
	139	ualg->cru_type = 0;
	140	ualg->cru_mask = 0;
a38f7907 SK	141	ualg->cru_flags = alg->cra_flags;
	142	ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
	143
6662df33 DM	144	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
6662df33 DM	145	goto nla_put_failure;
6c5a86f5 SK	146	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
	147	struct crypto_report_larval rl;
	148
9a5467bf	149	strncpy(rl.type, "larval", sizeof(rl.type));
6662df33 DM	150	if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
	151	sizeof(struct crypto_report_larval), &rl))
	152	goto nla_put_failure;
6c5a86f5 SK	153	goto out;
	154	}
	155
b6aa63c0 SK	156	if (alg->cra_type && alg->cra_type->report) {
	157	if (alg->cra_type->report(skb, alg))
	158	goto nla_put_failure;
07a5fa4a SK	159
	160	goto out;
	161	}
	162
	163	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_LARVAL)) {
	164	case CRYPTO_ALG_TYPE_CIPHER:
	165	if (crypto_report_cipher(skb, alg))
	166	goto nla_put_failure;
	167
540b97c1 SK	168	break;
	169	case CRYPTO_ALG_TYPE_COMPRESS:
	170	if (crypto_report_comp(skb, alg))
	171	goto nla_put_failure;
	172
07a5fa4a	173	break;
3c339ab8 TS	174
	175	case CRYPTO_ALG_TYPE_AKCIPHER:
	176	if (crypto_report_akcipher(skb, alg))
	177	goto nla_put_failure;
	178
	179	break;
b6aa63c0 SK	180	}
b6aa63c0 SK	181
6c5a86f5	182	out:
a38f7907 SK	183	return 0;
	184
	185	nla_put_failure:
	186	return -EMSGSIZE;
	187	}
	188
	189	static int crypto_report_alg(struct crypto_alg *alg,
	190	struct crypto_dump_info *info)
	191	{
	192	struct sk_buff *in_skb = info->in_skb;
	193	struct sk_buff *skb = info->out_skb;
	194	struct nlmsghdr *nlh;
	195	struct crypto_user_alg *ualg;
	196	int err = 0;
	197
15e47304	198	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
a38f7907 SK	199	CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	200	if (!nlh) {
	201	err = -EMSGSIZE;
	202	goto out;
	203	}
	204
	205	ualg = nlmsg_data(nlh);
	206
	207	err = crypto_report_one(alg, ualg, skb);
	208	if (err) {
	209	nlmsg_cancel(skb, nlh);
	210	goto out;
	211	}
	212
	213	nlmsg_end(skb, nlh);
	214
	215	out:
	216	return err;
	217	}
	218
	219	static int crypto_report(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	220	struct nlattr **attrs)
	221	{
	222	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	223	struct crypto_alg *alg;
	224	struct sk_buff *skb;
	225	struct crypto_dump_info info;
	226	int err;
	227
8fd61d34 MK	228	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	229	return -EINVAL;
	230
5d4a5e77	231	alg = crypto_alg_match(p, 0);
a38f7907 SK	232	if (!alg)
	233	return -ENOENT;
	234
016baaa1	235	err = -ENOMEM;
a38f7907 SK	236	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
a38f7907 SK	237	if (!skb)
016baaa1	238	goto drop_alg;
a38f7907 SK	239
	240	info.in_skb = in_skb;
	241	info.out_skb = skb;
	242	info.nlmsg_seq = in_nlh->nlmsg_seq;
	243	info.nlmsg_flags = 0;
	244
	245	err = crypto_report_alg(alg, &info);
016baaa1 HX	246
	247	drop_alg:
	248	crypto_mod_put(alg);
	249
a38f7907 SK	250	if (err)
	251	return err;
	252
15e47304	253	return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
a38f7907 SK	254	}
	255
	256	static int crypto_dump_report(struct sk_buff skb, struct netlink_callback cb)
	257	{
	258	struct crypto_alg *alg;
	259	struct crypto_dump_info info;
	260	int err;
	261
	262	if (cb->args[0])
	263	goto out;
	264
	265	cb->args[0] = 1;
	266
	267	info.in_skb = cb->skb;
	268	info.out_skb = skb;
	269	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	270	info.nlmsg_flags = NLM_F_MULTI;
	271
	272	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
	273	err = crypto_report_alg(alg, &info);
	274	if (err)
	275	goto out_err;
	276	}
	277
	278	out:
	279	return skb->len;
	280	out_err:
	281	return err;
	282	}
	283
	284	static int crypto_dump_report_done(struct netlink_callback *cb)
	285	{
	286	return 0;
	287	}
	288
	289	static int crypto_update_alg(struct sk_buff skb, struct nlmsghdr nlh,
	290	struct nlattr **attrs)
	291	{
	292	struct crypto_alg *alg;
	293	struct crypto_user_alg *p = nlmsg_data(nlh);
	294	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	295	LIST_HEAD(list);
	296
639b4ac6	297	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	298	return -EPERM;
c568398a MCO	299
8fd61d34 MK	300	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	301	return -EINVAL;
	302
a38f7907 SK	303	if (priority && !strlen(p->cru_driver_name))
	304	return -EINVAL;
	305
	306	alg = crypto_alg_match(p, 1);
	307	if (!alg)
	308	return -ENOENT;
	309
	310	down_write(&crypto_alg_sem);
	311
	312	crypto_remove_spawns(alg, &list, NULL);
	313
	314	if (priority)
	315	alg->cra_priority = nla_get_u32(priority);
	316
	317	up_write(&crypto_alg_sem);
	318
016baaa1	319	crypto_mod_put(alg);
a38f7907 SK	320	crypto_remove_final(&list);
	321
	322	return 0;
	323	}
	324
	325	static int crypto_del_alg(struct sk_buff skb, struct nlmsghdr nlh,
	326	struct nlattr **attrs)
	327	{
	328	struct crypto_alg *alg;
	329	struct crypto_user_alg *p = nlmsg_data(nlh);
016baaa1	330	int err;
a38f7907	331
639b4ac6	332	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	333	return -EPERM;
c568398a MCO	334
8fd61d34 MK	335	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	336	return -EINVAL;
	337
a38f7907 SK	338	alg = crypto_alg_match(p, 1);
	339	if (!alg)
	340	return -ENOENT;
	341
	342	/* We can not unregister core algorithms such as aes-generic.
	343	* We would loose the reference in the crypto_alg_list to this algorithm
	344	* if we try to unregister. Unregistering such an algorithm without
	345	* removing the module is not possible, so we restrict to crypto
	346	* instances that are build from templates. */
016baaa1	347	err = -EINVAL;
a38f7907	348	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
016baaa1	349	goto drop_alg;
a38f7907	350
016baaa1 HX	351	err = -EBUSY;
	352	if (atomic_read(&alg->cra_refcnt) > 2)
	353	goto drop_alg;
a38f7907	354
016baaa1 HX	355	err = crypto_unregister_instance((struct crypto_instance *)alg);
	356
	357	drop_alg:
	358	crypto_mod_put(alg);
	359	return err;
a38f7907 SK	360	}
a38f7907 SK	361
1e122994 SK	362	static struct crypto_alg crypto_user_skcipher_alg(const char name, u32 type,
	363	u32 mask)
	364	{
	365	int err;
	366	struct crypto_alg *alg;
	367
	368	type = crypto_skcipher_type(type);
	369	mask = crypto_skcipher_mask(mask);
	370
	371	for (;;) {
	372	alg = crypto_lookup_skcipher(name, type, mask);
	373	if (!IS_ERR(alg))
	374	return alg;
	375
	376	err = PTR_ERR(alg);
	377	if (err != -EAGAIN)
	378	break;
	379	if (signal_pending(current)) {
	380	err = -EINTR;
	381	break;
	382	}
	383	}
	384
	385	return ERR_PTR(err);
	386	}
	387
	388	static struct crypto_alg crypto_user_aead_alg(const char name, u32 type,
	389	u32 mask)
	390	{
	391	int err;
	392	struct crypto_alg *alg;
	393
	394	type &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
	395	type \|= CRYPTO_ALG_TYPE_AEAD;
	396	mask &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
	397	mask \|= CRYPTO_ALG_TYPE_MASK;
	398
	399	for (;;) {
	400	alg = crypto_lookup_aead(name, type, mask);
	401	if (!IS_ERR(alg))
	402	return alg;
	403
	404	err = PTR_ERR(alg);
	405	if (err != -EAGAIN)
	406	break;
	407	if (signal_pending(current)) {
	408	err = -EINTR;
	409	break;
	410	}
	411	}
	412
	413	return ERR_PTR(err);
	414	}
	415
a38f7907 SK	416	static int crypto_add_alg(struct sk_buff skb, struct nlmsghdr nlh,
	417	struct nlattr **attrs)
	418	{
0cfdec7a	419	int exact = 0;
a38f7907 SK	420	const char *name;
	421	struct crypto_alg *alg;
	422	struct crypto_user_alg *p = nlmsg_data(nlh);
	423	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	424
639b4ac6	425	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	426	return -EPERM;
c568398a MCO	427
8fd61d34 MK	428	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	429	return -EINVAL;
	430
a38f7907 SK	431	if (strlen(p->cru_driver_name))
	432	exact = 1;
	433
	434	if (priority && !exact)
	435	return -EINVAL;
	436
	437	alg = crypto_alg_match(p, exact);
016baaa1 HX	438	if (alg) {
016baaa1 HX	439	crypto_mod_put(alg);
a38f7907	440	return -EEXIST;
016baaa1	441	}
a38f7907 SK	442
	443	if (strlen(p->cru_driver_name))
	444	name = p->cru_driver_name;
	445	else
	446	name = p->cru_name;
	447
1e122994 SK	448	switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) {
	449	case CRYPTO_ALG_TYPE_AEAD:
	450	alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask);
	451	break;
	452	case CRYPTO_ALG_TYPE_GIVCIPHER:
	453	case CRYPTO_ALG_TYPE_BLKCIPHER:
	454	case CRYPTO_ALG_TYPE_ABLKCIPHER:
	455	alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask);
	456	break;
	457	default:
	458	alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
	459	}
	460
a38f7907 SK	461	if (IS_ERR(alg))
	462	return PTR_ERR(alg);
	463
	464	down_write(&crypto_alg_sem);
	465
	466	if (priority)
	467	alg->cra_priority = nla_get_u32(priority);
	468
	469	up_write(&crypto_alg_sem);
	470
	471	crypto_mod_put(alg);
	472
	473	return 0;
	474	}
	475
9aa867e4 HX	476	static int crypto_del_rng(struct sk_buff skb, struct nlmsghdr nlh,
	477	struct nlattr **attrs)
	478	{
	479	if (!netlink_capable(skb, CAP_NET_ADMIN))
	480	return -EPERM;
	481	return crypto_del_default_rng();
	482	}
	483
a38f7907 SK	484	#define MSGSIZE(type) sizeof(struct type)
	485
	486	static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
	487	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	488	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	489	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
9aa867e4	490	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
a38f7907 SK	491	};
	492
	493	static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
	494	[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
	495	};
	496
	497	#undef MSGSIZE
	498
a84fb791	499	static const struct crypto_link {
a38f7907 SK	500	int (doit)(struct sk_buff , struct nlmsghdr , struct nlattr *);
	501	int (dump)(struct sk_buff , struct netlink_callback *);
	502	int (done)(struct netlink_callback );
	503	} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
	504	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
	505	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
	506	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
	507	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
	508	.dump = crypto_dump_report,
	509	.done = crypto_dump_report_done},
9aa867e4	510	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
a38f7907 SK	511	};
	512
	513	static int crypto_user_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	514	{
	515	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
a84fb791	516	const struct crypto_link *link;
a38f7907 SK	517	int type, err;
	518
	519	type = nlh->nlmsg_type;
	520	if (type > CRYPTO_MSG_MAX)
	521	return -EINVAL;
	522
	523	type -= CRYPTO_MSG_BASE;
	524	link = &crypto_dispatch[type];
	525
a38f7907 SK	526	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
a38f7907 SK	527	(nlh->nlmsg_flags & NLM_F_DUMP))) {
5219a534 SK	528	struct crypto_alg *alg;
	529	u16 dump_alloc = 0;
	530
a38f7907 SK	531	if (link->dump == NULL)
a38f7907 SK	532	return -EINVAL;
5219a534 SK	533
	534	list_for_each_entry(alg, &crypto_alg_list, cra_list)
	535	dump_alloc += CRYPTO_REPORT_MAXSIZE;
	536
80d326fa PNA	537	{
	538	struct netlink_dump_control c = {
	539	.dump = link->dump,
	540	.done = link->done,
5219a534	541	.min_dump_alloc = dump_alloc,
80d326fa PNA	542	};
	543	return netlink_dump_start(crypto_nlsk, skb, nlh, &c);
	544	}
a38f7907 SK	545	}
	546
	547	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
	548	crypto_policy);
	549	if (err < 0)
	550	return err;
	551
	552	if (link->doit == NULL)
	553	return -EINVAL;
	554
	555	return link->doit(skb, nlh, attrs);
	556	}
	557
	558	static void crypto_netlink_rcv(struct sk_buff *skb)
	559	{
	560	mutex_lock(&crypto_cfg_mutex);
	561	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
	562	mutex_unlock(&crypto_cfg_mutex);
	563	}
	564
	565	static int __init crypto_user_init(void)
	566	{
a31f2d17 PNA	567	struct netlink_kernel_cfg cfg = {
	568	.input = crypto_netlink_rcv,
	569	};
	570
9f00d977	571	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
a38f7907 SK	572	if (!crypto_nlsk)
	573	return -ENOMEM;
	574
	575	return 0;
	576	}
	577
	578	static void __exit crypto_user_exit(void)
	579	{
	580	netlink_kernel_release(crypto_nlsk);
	581	}
	582
	583	module_init(crypto_user_init);
	584	module_exit(crypto_user_exit);
	585	MODULE_LICENSE("GPL");
	586	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	587	MODULE_DESCRIPTION("Crypto userspace configuration API");
476c7fe2	588	MODULE_ALIAS("net-pf-16-proto-21");