[linux.git] / crypto / crypto_user.c

/*
 * Crypto user configuration API.
 *
 * Copyright (C) 2011 secunet Security Networks AG
 * Copyright (C) 2011 Steffen Klassert <[email protected]>
 *
 * 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/skcipher.h>
#include <crypto/internal/rng.h>
#include <crypto/akcipher.h>
#include <crypto/kpp.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;

	strlcpy(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;

	strlcpy(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_acomp(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_acomp racomp;

	strlcpy(racomp.type, "acomp", sizeof(racomp.type));

	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
		    sizeof(struct crypto_report_acomp), &racomp))
		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;

	strlcpy(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_kpp(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_kpp rkpp;

	strlcpy(rkpp.type, "kpp", sizeof(rkpp.type));

	if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
		    sizeof(struct crypto_report_kpp), &rkpp))
		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)
{
	strlcpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
	strlcpy(ualg->cru_driver_name, alg->cra_driver_name,
		sizeof(ualg->cru_driver_name));
	strlcpy(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;

		strlcpy(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_ACOMPRESS:
		if (crypto_report_acomp(skb, alg))
			goto nla_put_failure;

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

		break;
	case CRYPTO_ALG_TYPE_KPP:
		if (crypto_report_kpp(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 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;

	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_GETALG	- 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 netlink_ext_ack *extack)
{
	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;

		down_read(&crypto_alg_sem);
		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,
			};
			err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
		}
		up_read(&crypto_alg_sem);

		return err;
	}

	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
			  crypto_policy, extack);
	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 <[email protected]>");
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 <[email protected]>
	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	28	#include <crypto/internal/skcipher.h>
9aa867e4	29	#include <crypto/internal/rng.h>
3c339ab8	30	#include <crypto/akcipher.h>
4e5f2c40	31	#include <crypto/kpp.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
4473710d	86	strlcpy(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
4473710d	105	strlcpy(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
2ebda74f GC	115	static int crypto_report_acomp(struct sk_buff skb, struct crypto_alg alg)
	116	{
	117	struct crypto_report_acomp racomp;
	118
4473710d	119	strlcpy(racomp.type, "acomp", sizeof(racomp.type));
2ebda74f GC	120
	121	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
	122	sizeof(struct crypto_report_acomp), &racomp))
	123	goto nla_put_failure;
	124	return 0;
	125
	126	nla_put_failure:
	127	return -EMSGSIZE;
	128	}
	129
3c339ab8 TS	130	static int crypto_report_akcipher(struct sk_buff skb, struct crypto_alg alg)
	131	{
	132	struct crypto_report_akcipher rakcipher;
	133
4473710d	134	strlcpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
3c339ab8 TS	135
	136	if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
	137	sizeof(struct crypto_report_akcipher), &rakcipher))
	138	goto nla_put_failure;
	139	return 0;
	140
	141	nla_put_failure:
	142	return -EMSGSIZE;
	143	}
	144
4e5f2c40 SB	145	static int crypto_report_kpp(struct sk_buff skb, struct crypto_alg alg)
	146	{
	147	struct crypto_report_kpp rkpp;
	148
4473710d	149	strlcpy(rkpp.type, "kpp", sizeof(rkpp.type));
4e5f2c40 SB	150
	151	if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
	152	sizeof(struct crypto_report_kpp), &rkpp))
	153	goto nla_put_failure;
	154	return 0;
	155
	156	nla_put_failure:
	157	return -EMSGSIZE;
	158	}
	159
a38f7907 SK	160	static int crypto_report_one(struct crypto_alg *alg,
	161	struct crypto_user_alg ualg, struct sk_buff skb)
	162	{
4473710d HX	163	strlcpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
4473710d HX	164	strlcpy(ualg->cru_driver_name, alg->cra_driver_name,
9a5467bf	165	sizeof(ualg->cru_driver_name));
4473710d	166	strlcpy(ualg->cru_module_name, module_name(alg->cra_module),
9a5467bf MK	167	sizeof(ualg->cru_module_name));
	168
	169	ualg->cru_type = 0;
	170	ualg->cru_mask = 0;
a38f7907 SK	171	ualg->cru_flags = alg->cra_flags;
	172	ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
	173
6662df33 DM	174	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
6662df33 DM	175	goto nla_put_failure;
6c5a86f5 SK	176	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
	177	struct crypto_report_larval rl;
	178
4473710d	179	strlcpy(rl.type, "larval", sizeof(rl.type));
6662df33 DM	180	if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
	181	sizeof(struct crypto_report_larval), &rl))
	182	goto nla_put_failure;
6c5a86f5 SK	183	goto out;
	184	}
	185
b6aa63c0 SK	186	if (alg->cra_type && alg->cra_type->report) {
	187	if (alg->cra_type->report(skb, alg))
	188	goto nla_put_failure;
07a5fa4a SK	189
	190	goto out;
	191	}
	192
	193	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_LARVAL)) {
	194	case CRYPTO_ALG_TYPE_CIPHER:
	195	if (crypto_report_cipher(skb, alg))
	196	goto nla_put_failure;
	197
540b97c1 SK	198	break;
	199	case CRYPTO_ALG_TYPE_COMPRESS:
	200	if (crypto_report_comp(skb, alg))
	201	goto nla_put_failure;
	202
07a5fa4a	203	break;
2ebda74f GC	204	case CRYPTO_ALG_TYPE_ACOMPRESS:
	205	if (crypto_report_acomp(skb, alg))
	206	goto nla_put_failure;
3c339ab8	207
2ebda74f	208	break;
3c339ab8 TS	209	case CRYPTO_ALG_TYPE_AKCIPHER:
	210	if (crypto_report_akcipher(skb, alg))
	211	goto nla_put_failure;
	212
	213	break;
4e5f2c40 SB	214	case CRYPTO_ALG_TYPE_KPP:
	215	if (crypto_report_kpp(skb, alg))
	216	goto nla_put_failure;
	217	break;
b6aa63c0 SK	218	}
b6aa63c0 SK	219
6c5a86f5	220	out:
a38f7907 SK	221	return 0;
	222
	223	nla_put_failure:
	224	return -EMSGSIZE;
	225	}
	226
	227	static int crypto_report_alg(struct crypto_alg *alg,
	228	struct crypto_dump_info *info)
	229	{
	230	struct sk_buff *in_skb = info->in_skb;
	231	struct sk_buff *skb = info->out_skb;
	232	struct nlmsghdr *nlh;
	233	struct crypto_user_alg *ualg;
	234	int err = 0;
	235
15e47304	236	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
a38f7907 SK	237	CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	238	if (!nlh) {
	239	err = -EMSGSIZE;
	240	goto out;
	241	}
	242
	243	ualg = nlmsg_data(nlh);
	244
	245	err = crypto_report_one(alg, ualg, skb);
	246	if (err) {
	247	nlmsg_cancel(skb, nlh);
	248	goto out;
	249	}
	250
	251	nlmsg_end(skb, nlh);
	252
	253	out:
	254	return err;
	255	}
	256
	257	static int crypto_report(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	258	struct nlattr **attrs)
	259	{
	260	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	261	struct crypto_alg *alg;
	262	struct sk_buff *skb;
	263	struct crypto_dump_info info;
	264	int err;
	265
8fd61d34 MK	266	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	267	return -EINVAL;
	268
5d4a5e77	269	alg = crypto_alg_match(p, 0);
a38f7907 SK	270	if (!alg)
	271	return -ENOENT;
	272
016baaa1	273	err = -ENOMEM;
a38f7907 SK	274	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
a38f7907 SK	275	if (!skb)
016baaa1	276	goto drop_alg;
a38f7907 SK	277
	278	info.in_skb = in_skb;
	279	info.out_skb = skb;
	280	info.nlmsg_seq = in_nlh->nlmsg_seq;
	281	info.nlmsg_flags = 0;
	282
	283	err = crypto_report_alg(alg, &info);
016baaa1 HX	284
	285	drop_alg:
	286	crypto_mod_put(alg);
	287
a38f7907 SK	288	if (err)
	289	return err;
	290
15e47304	291	return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
a38f7907 SK	292	}
	293
	294	static int crypto_dump_report(struct sk_buff skb, struct netlink_callback cb)
	295	{
	296	struct crypto_alg *alg;
	297	struct crypto_dump_info info;
	298	int err;
	299
	300	if (cb->args[0])
	301	goto out;
	302
	303	cb->args[0] = 1;
	304
	305	info.in_skb = cb->skb;
	306	info.out_skb = skb;
	307	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	308	info.nlmsg_flags = NLM_F_MULTI;
	309
	310	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
	311	err = crypto_report_alg(alg, &info);
	312	if (err)
	313	goto out_err;
	314	}
	315
	316	out:
	317	return skb->len;
	318	out_err:
	319	return err;
	320	}
	321
	322	static int crypto_dump_report_done(struct netlink_callback *cb)
	323	{
	324	return 0;
	325	}
	326
	327	static int crypto_update_alg(struct sk_buff skb, struct nlmsghdr nlh,
	328	struct nlattr **attrs)
	329	{
	330	struct crypto_alg *alg;
	331	struct crypto_user_alg *p = nlmsg_data(nlh);
	332	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	333	LIST_HEAD(list);
	334
639b4ac6	335	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	336	return -EPERM;
c568398a MCO	337
8fd61d34 MK	338	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	339	return -EINVAL;
	340
a38f7907 SK	341	if (priority && !strlen(p->cru_driver_name))
	342	return -EINVAL;
	343
	344	alg = crypto_alg_match(p, 1);
	345	if (!alg)
	346	return -ENOENT;
	347
	348	down_write(&crypto_alg_sem);
	349
	350	crypto_remove_spawns(alg, &list, NULL);
	351
	352	if (priority)
	353	alg->cra_priority = nla_get_u32(priority);
	354
	355	up_write(&crypto_alg_sem);
	356
016baaa1	357	crypto_mod_put(alg);
a38f7907 SK	358	crypto_remove_final(&list);
	359
	360	return 0;
	361	}
	362
	363	static int crypto_del_alg(struct sk_buff skb, struct nlmsghdr nlh,
	364	struct nlattr **attrs)
	365	{
	366	struct crypto_alg *alg;
	367	struct crypto_user_alg *p = nlmsg_data(nlh);
016baaa1	368	int err;
a38f7907	369
639b4ac6	370	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	371	return -EPERM;
c568398a MCO	372
8fd61d34 MK	373	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	374	return -EINVAL;
	375
a38f7907 SK	376	alg = crypto_alg_match(p, 1);
	377	if (!alg)
	378	return -ENOENT;
	379
	380	/* We can not unregister core algorithms such as aes-generic.
	381	* We would loose the reference in the crypto_alg_list to this algorithm
	382	* if we try to unregister. Unregistering such an algorithm without
	383	* removing the module is not possible, so we restrict to crypto
	384	* instances that are build from templates. */
016baaa1	385	err = -EINVAL;
a38f7907	386	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
016baaa1	387	goto drop_alg;
a38f7907	388
016baaa1 HX	389	err = -EBUSY;
	390	if (atomic_read(&alg->cra_refcnt) > 2)
	391	goto drop_alg;
a38f7907	392
016baaa1 HX	393	err = crypto_unregister_instance((struct crypto_instance *)alg);
	394
	395	drop_alg:
	396	crypto_mod_put(alg);
	397	return err;
a38f7907 SK	398	}
	399
	400	static int crypto_add_alg(struct sk_buff skb, struct nlmsghdr nlh,
	401	struct nlattr **attrs)
	402	{
0cfdec7a	403	int exact = 0;
a38f7907 SK	404	const char *name;
	405	struct crypto_alg *alg;
	406	struct crypto_user_alg *p = nlmsg_data(nlh);
	407	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	408
639b4ac6	409	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	410	return -EPERM;
c568398a MCO	411
8fd61d34 MK	412	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	413	return -EINVAL;
	414
a38f7907 SK	415	if (strlen(p->cru_driver_name))
	416	exact = 1;
	417
	418	if (priority && !exact)
	419	return -EINVAL;
	420
	421	alg = crypto_alg_match(p, exact);
016baaa1 HX	422	if (alg) {
016baaa1 HX	423	crypto_mod_put(alg);
a38f7907	424	return -EEXIST;
016baaa1	425	}
a38f7907 SK	426
	427	if (strlen(p->cru_driver_name))
	428	name = p->cru_driver_name;
	429	else
	430	name = p->cru_name;
	431
6cf80a29	432	alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
a38f7907 SK	433	if (IS_ERR(alg))
	434	return PTR_ERR(alg);
	435
	436	down_write(&crypto_alg_sem);
	437
	438	if (priority)
	439	alg->cra_priority = nla_get_u32(priority);
	440
	441	up_write(&crypto_alg_sem);
	442
	443	crypto_mod_put(alg);
	444
	445	return 0;
	446	}
	447
9aa867e4 HX	448	static int crypto_del_rng(struct sk_buff skb, struct nlmsghdr nlh,
	449	struct nlattr **attrs)
	450	{
	451	if (!netlink_capable(skb, CAP_NET_ADMIN))
	452	return -EPERM;
	453	return crypto_del_default_rng();
	454	}
	455
a38f7907 SK	456	#define MSGSIZE(type) sizeof(struct type)
	457
	458	static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
	459	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	460	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	461	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
055ddaac	462	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
9aa867e4	463	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
a38f7907 SK	464	};
	465
	466	static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
	467	[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
	468	};
	469
	470	#undef MSGSIZE
	471
a84fb791	472	static const struct crypto_link {
a38f7907 SK	473	int (doit)(struct sk_buff , struct nlmsghdr , struct nlattr *);
	474	int (dump)(struct sk_buff , struct netlink_callback *);
	475	int (done)(struct netlink_callback );
	476	} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
	477	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
	478	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
	479	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
	480	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
	481	.dump = crypto_dump_report,
	482	.done = crypto_dump_report_done},
9aa867e4	483	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
a38f7907 SK	484	};
a38f7907 SK	485
2d4bc933 JB	486	static int crypto_user_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh,
2d4bc933 JB	487	struct netlink_ext_ack *extack)
a38f7907 SK	488	{
a38f7907 SK	489	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
a84fb791	490	const struct crypto_link *link;
a38f7907 SK	491	int type, err;
	492
	493	type = nlh->nlmsg_type;
	494	if (type > CRYPTO_MSG_MAX)
	495	return -EINVAL;
	496
	497	type -= CRYPTO_MSG_BASE;
	498	link = &crypto_dispatch[type];
	499
a38f7907 SK	500	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
a38f7907 SK	501	(nlh->nlmsg_flags & NLM_F_DUMP))) {
5219a534 SK	502	struct crypto_alg *alg;
	503	u16 dump_alloc = 0;
	504
a38f7907 SK	505	if (link->dump == NULL)
a38f7907 SK	506	return -EINVAL;
5219a534	507
63e41ebc	508	down_read(&crypto_alg_sem);
5219a534 SK	509	list_for_each_entry(alg, &crypto_alg_list, cra_list)
	510	dump_alloc += CRYPTO_REPORT_MAXSIZE;
	511
80d326fa PNA	512	{
	513	struct netlink_dump_control c = {
	514	.dump = link->dump,
	515	.done = link->done,
5219a534	516	.min_dump_alloc = dump_alloc,
80d326fa	517	};
63e41ebc	518	err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
80d326fa	519	}
63e41ebc MK	520	up_read(&crypto_alg_sem);
	521
	522	return err;
a38f7907 SK	523	}
a38f7907 SK	524
fd2efd93	525	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
fe52145f	526	crypto_policy, extack);
fd2efd93 HX	527	if (err < 0)
fd2efd93 HX	528	return err;
a38f7907 SK	529
	530	if (link->doit == NULL)
	531	return -EINVAL;
	532
	533	return link->doit(skb, nlh, attrs);
	534	}
	535
	536	static void crypto_netlink_rcv(struct sk_buff *skb)
	537	{
	538	mutex_lock(&crypto_cfg_mutex);
	539	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
	540	mutex_unlock(&crypto_cfg_mutex);
	541	}
	542
	543	static int __init crypto_user_init(void)
	544	{
a31f2d17 PNA	545	struct netlink_kernel_cfg cfg = {
	546	.input = crypto_netlink_rcv,
	547	};
	548
9f00d977	549	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
a38f7907 SK	550	if (!crypto_nlsk)
	551	return -ENOMEM;
	552
	553	return 0;
	554	}
	555
	556	static void __exit crypto_user_exit(void)
	557	{
	558	netlink_kernel_release(crypto_nlsk);
	559	}
	560
	561	module_init(crypto_user_init);
	562	module_exit(crypto_user_exit);
	563	MODULE_LICENSE("GPL");
	564	MODULE_AUTHOR("Steffen Klassert <[email protected]>");
	565	MODULE_DESCRIPTION("Crypto userspace configuration API");
476c7fe2	566	MODULE_ALIAS("net-pf-16-proto-21");