[linux-2.6-block.git] / crypto / crypto_user_base.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/skcipher.h>
#include <crypto/internal/rng.h>
#include <crypto/akcipher.h>
#include <crypto/kpp.h>
#include <crypto/internal/cryptouser.h>

#include "internal.h"

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

static DEFINE_MUTEX(crypto_cfg_mutex);

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

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

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 = refcount_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_KERNEL);
	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 (refcount_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,
	[CRYPTO_MSG_GETSTAT	- CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
};

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 },
	[CRYPTO_MSG_GETSTAT	- CRYPTO_MSG_BASE] = { .doit = crypto_reportstat,
						       .dump = crypto_dump_reportstat,
						       .done = crypto_dump_reportstat_done},
};

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 <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	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>
cac5818c	32	#include <crypto/internal/cryptouser.h>
1e122994	33
a38f7907 SK	34	#include "internal.h"
a38f7907 SK	35
8fd61d34 MK	36	#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
8fd61d34 MK	37
66ce0b0f	38	static DEFINE_MUTEX(crypto_cfg_mutex);
a38f7907 SK	39
a38f7907 SK	40	/* The crypto netlink socket */
cac5818c	41	struct sock *crypto_nlsk;
a38f7907 SK	42
	43	struct crypto_dump_info {
	44	struct sk_buff *in_skb;
	45	struct sk_buff *out_skb;
	46	u32 nlmsg_seq;
	47	u16 nlmsg_flags;
	48	};
	49
cac5818c	50	struct crypto_alg crypto_alg_match(struct crypto_user_alg p, int exact)
a38f7907	51	{
a38f7907 SK	52	struct crypto_alg q, alg = NULL;
	53
	54	down_read(&crypto_alg_sem);
	55
a38f7907	56	list_for_each_entry(q, &crypto_alg_list, cra_list) {
e6ea64ec	57	int match = 0;
a38f7907 SK	58
	59	if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
	60	continue;
	61
	62	if (strlen(p->cru_driver_name))
	63	match = !strcmp(q->cra_driver_name,
	64	p->cru_driver_name);
	65	else if (!exact)
	66	match = !strcmp(q->cra_name, p->cru_name);
	67
016baaa1 HX	68	if (!match)
	69	continue;
	70
	71	if (unlikely(!crypto_mod_get(q)))
	72	continue;
	73
	74	alg = q;
	75	break;
a38f7907 SK	76	}
	77
	78	up_read(&crypto_alg_sem);
	79
	80	return alg;
	81	}
	82
07a5fa4a SK	83	static int crypto_report_cipher(struct sk_buff skb, struct crypto_alg alg)
	84	{
	85	struct crypto_report_cipher rcipher;
	86
4473710d	87	strlcpy(rcipher.type, "cipher", sizeof(rcipher.type));
07a5fa4a SK	88
	89	rcipher.blocksize = alg->cra_blocksize;
	90	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
	91	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
	92
6662df33 DM	93	if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
	94	sizeof(struct crypto_report_cipher), &rcipher))
	95	goto nla_put_failure;
07a5fa4a SK	96	return 0;
	97
	98	nla_put_failure:
	99	return -EMSGSIZE;
	100	}
	101
540b97c1 SK	102	static int crypto_report_comp(struct sk_buff skb, struct crypto_alg alg)
	103	{
	104	struct crypto_report_comp rcomp;
	105
4473710d	106	strlcpy(rcomp.type, "compression", sizeof(rcomp.type));
6662df33 DM	107	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
	108	sizeof(struct crypto_report_comp), &rcomp))
	109	goto nla_put_failure;
540b97c1 SK	110	return 0;
	111
	112	nla_put_failure:
	113	return -EMSGSIZE;
	114	}
	115
2ebda74f GC	116	static int crypto_report_acomp(struct sk_buff skb, struct crypto_alg alg)
	117	{
	118	struct crypto_report_acomp racomp;
	119
4473710d	120	strlcpy(racomp.type, "acomp", sizeof(racomp.type));
2ebda74f GC	121
	122	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
	123	sizeof(struct crypto_report_acomp), &racomp))
	124	goto nla_put_failure;
	125	return 0;
	126
	127	nla_put_failure:
	128	return -EMSGSIZE;
	129	}
	130
3c339ab8 TS	131	static int crypto_report_akcipher(struct sk_buff skb, struct crypto_alg alg)
	132	{
	133	struct crypto_report_akcipher rakcipher;
	134
4473710d	135	strlcpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
3c339ab8 TS	136
	137	if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
	138	sizeof(struct crypto_report_akcipher), &rakcipher))
	139	goto nla_put_failure;
	140	return 0;
	141
	142	nla_put_failure:
	143	return -EMSGSIZE;
	144	}
	145
4e5f2c40 SB	146	static int crypto_report_kpp(struct sk_buff skb, struct crypto_alg alg)
	147	{
	148	struct crypto_report_kpp rkpp;
	149
4473710d	150	strlcpy(rkpp.type, "kpp", sizeof(rkpp.type));
4e5f2c40 SB	151
	152	if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
	153	sizeof(struct crypto_report_kpp), &rkpp))
	154	goto nla_put_failure;
	155	return 0;
	156
	157	nla_put_failure:
	158	return -EMSGSIZE;
	159	}
	160
a38f7907 SK	161	static int crypto_report_one(struct crypto_alg *alg,
	162	struct crypto_user_alg ualg, struct sk_buff skb)
	163	{
4473710d HX	164	strlcpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
4473710d HX	165	strlcpy(ualg->cru_driver_name, alg->cra_driver_name,
9a5467bf	166	sizeof(ualg->cru_driver_name));
4473710d	167	strlcpy(ualg->cru_module_name, module_name(alg->cra_module),
9a5467bf MK	168	sizeof(ualg->cru_module_name));
	169
	170	ualg->cru_type = 0;
	171	ualg->cru_mask = 0;
a38f7907	172	ualg->cru_flags = alg->cra_flags;
ce8614a3	173	ualg->cru_refcnt = refcount_read(&alg->cra_refcnt);
a38f7907	174
6662df33 DM	175	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
6662df33 DM	176	goto nla_put_failure;
6c5a86f5 SK	177	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
	178	struct crypto_report_larval rl;
	179
4473710d	180	strlcpy(rl.type, "larval", sizeof(rl.type));
6662df33 DM	181	if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
	182	sizeof(struct crypto_report_larval), &rl))
	183	goto nla_put_failure;
6c5a86f5 SK	184	goto out;
	185	}
	186
b6aa63c0 SK	187	if (alg->cra_type && alg->cra_type->report) {
	188	if (alg->cra_type->report(skb, alg))
	189	goto nla_put_failure;
07a5fa4a SK	190
	191	goto out;
	192	}
	193
	194	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_LARVAL)) {
	195	case CRYPTO_ALG_TYPE_CIPHER:
	196	if (crypto_report_cipher(skb, alg))
	197	goto nla_put_failure;
	198
540b97c1 SK	199	break;
	200	case CRYPTO_ALG_TYPE_COMPRESS:
	201	if (crypto_report_comp(skb, alg))
	202	goto nla_put_failure;
	203
07a5fa4a	204	break;
2ebda74f GC	205	case CRYPTO_ALG_TYPE_ACOMPRESS:
	206	if (crypto_report_acomp(skb, alg))
	207	goto nla_put_failure;
3c339ab8	208
2ebda74f	209	break;
3c339ab8 TS	210	case CRYPTO_ALG_TYPE_AKCIPHER:
	211	if (crypto_report_akcipher(skb, alg))
	212	goto nla_put_failure;
	213
	214	break;
4e5f2c40 SB	215	case CRYPTO_ALG_TYPE_KPP:
	216	if (crypto_report_kpp(skb, alg))
	217	goto nla_put_failure;
	218	break;
b6aa63c0 SK	219	}
b6aa63c0 SK	220
6c5a86f5	221	out:
a38f7907 SK	222	return 0;
	223
	224	nla_put_failure:
	225	return -EMSGSIZE;
	226	}
	227
	228	static int crypto_report_alg(struct crypto_alg *alg,
	229	struct crypto_dump_info *info)
	230	{
	231	struct sk_buff *in_skb = info->in_skb;
	232	struct sk_buff *skb = info->out_skb;
	233	struct nlmsghdr *nlh;
	234	struct crypto_user_alg *ualg;
	235	int err = 0;
	236
15e47304	237	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
a38f7907 SK	238	CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	239	if (!nlh) {
	240	err = -EMSGSIZE;
	241	goto out;
	242	}
	243
	244	ualg = nlmsg_data(nlh);
	245
	246	err = crypto_report_one(alg, ualg, skb);
	247	if (err) {
	248	nlmsg_cancel(skb, nlh);
	249	goto out;
	250	}
	251
	252	nlmsg_end(skb, nlh);
	253
	254	out:
	255	return err;
	256	}
	257
	258	static int crypto_report(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	259	struct nlattr **attrs)
	260	{
	261	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	262	struct crypto_alg *alg;
	263	struct sk_buff *skb;
	264	struct crypto_dump_info info;
	265	int err;
	266
8fd61d34 MK	267	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	268	return -EINVAL;
	269
5d4a5e77	270	alg = crypto_alg_match(p, 0);
a38f7907 SK	271	if (!alg)
	272	return -ENOENT;
	273
016baaa1	274	err = -ENOMEM;
9a69b7ae	275	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
a38f7907	276	if (!skb)
016baaa1	277	goto drop_alg;
a38f7907 SK	278
	279	info.in_skb = in_skb;
	280	info.out_skb = skb;
	281	info.nlmsg_seq = in_nlh->nlmsg_seq;
	282	info.nlmsg_flags = 0;
	283
	284	err = crypto_report_alg(alg, &info);
016baaa1 HX	285
	286	drop_alg:
	287	crypto_mod_put(alg);
	288
a38f7907 SK	289	if (err)
	290	return err;
	291
15e47304	292	return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
a38f7907 SK	293	}
	294
	295	static int crypto_dump_report(struct sk_buff skb, struct netlink_callback cb)
	296	{
	297	struct crypto_alg *alg;
	298	struct crypto_dump_info info;
	299	int err;
	300
	301	if (cb->args[0])
	302	goto out;
	303
	304	cb->args[0] = 1;
	305
	306	info.in_skb = cb->skb;
	307	info.out_skb = skb;
	308	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	309	info.nlmsg_flags = NLM_F_MULTI;
	310
	311	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
	312	err = crypto_report_alg(alg, &info);
	313	if (err)
	314	goto out_err;
	315	}
	316
	317	out:
	318	return skb->len;
	319	out_err:
	320	return err;
	321	}
	322
	323	static int crypto_dump_report_done(struct netlink_callback *cb)
	324	{
	325	return 0;
	326	}
	327
	328	static int crypto_update_alg(struct sk_buff skb, struct nlmsghdr nlh,
	329	struct nlattr **attrs)
	330	{
	331	struct crypto_alg *alg;
	332	struct crypto_user_alg *p = nlmsg_data(nlh);
	333	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	334	LIST_HEAD(list);
	335
639b4ac6	336	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	337	return -EPERM;
c568398a MCO	338
8fd61d34 MK	339	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	340	return -EINVAL;
	341
a38f7907 SK	342	if (priority && !strlen(p->cru_driver_name))
	343	return -EINVAL;
	344
	345	alg = crypto_alg_match(p, 1);
	346	if (!alg)
	347	return -ENOENT;
	348
	349	down_write(&crypto_alg_sem);
	350
	351	crypto_remove_spawns(alg, &list, NULL);
	352
	353	if (priority)
	354	alg->cra_priority = nla_get_u32(priority);
	355
	356	up_write(&crypto_alg_sem);
	357
016baaa1	358	crypto_mod_put(alg);
a38f7907 SK	359	crypto_remove_final(&list);
	360
	361	return 0;
	362	}
	363
	364	static int crypto_del_alg(struct sk_buff skb, struct nlmsghdr nlh,
	365	struct nlattr **attrs)
	366	{
	367	struct crypto_alg *alg;
	368	struct crypto_user_alg *p = nlmsg_data(nlh);
016baaa1	369	int err;
a38f7907	370
639b4ac6	371	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	372	return -EPERM;
c568398a MCO	373
8fd61d34 MK	374	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	375	return -EINVAL;
	376
a38f7907 SK	377	alg = crypto_alg_match(p, 1);
	378	if (!alg)
	379	return -ENOENT;
	380
	381	/* We can not unregister core algorithms such as aes-generic.
	382	* We would loose the reference in the crypto_alg_list to this algorithm
	383	* if we try to unregister. Unregistering such an algorithm without
	384	* removing the module is not possible, so we restrict to crypto
	385	* instances that are build from templates. */
016baaa1	386	err = -EINVAL;
a38f7907	387	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
016baaa1	388	goto drop_alg;
a38f7907	389
016baaa1	390	err = -EBUSY;
ce8614a3	391	if (refcount_read(&alg->cra_refcnt) > 2)
016baaa1	392	goto drop_alg;
a38f7907	393
016baaa1 HX	394	err = crypto_unregister_instance((struct crypto_instance *)alg);
	395
	396	drop_alg:
	397	crypto_mod_put(alg);
	398	return err;
a38f7907 SK	399	}
	400
	401	static int crypto_add_alg(struct sk_buff skb, struct nlmsghdr nlh,
	402	struct nlattr **attrs)
	403	{
0cfdec7a	404	int exact = 0;
a38f7907 SK	405	const char *name;
	406	struct crypto_alg *alg;
	407	struct crypto_user_alg *p = nlmsg_data(nlh);
	408	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	409
639b4ac6	410	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	411	return -EPERM;
c568398a MCO	412
8fd61d34 MK	413	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	414	return -EINVAL;
	415
a38f7907 SK	416	if (strlen(p->cru_driver_name))
	417	exact = 1;
	418
	419	if (priority && !exact)
	420	return -EINVAL;
	421
	422	alg = crypto_alg_match(p, exact);
016baaa1 HX	423	if (alg) {
016baaa1 HX	424	crypto_mod_put(alg);
a38f7907	425	return -EEXIST;
016baaa1	426	}
a38f7907 SK	427
	428	if (strlen(p->cru_driver_name))
	429	name = p->cru_driver_name;
	430	else
	431	name = p->cru_name;
	432
6cf80a29	433	alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
a38f7907 SK	434	if (IS_ERR(alg))
	435	return PTR_ERR(alg);
	436
	437	down_write(&crypto_alg_sem);
	438
	439	if (priority)
	440	alg->cra_priority = nla_get_u32(priority);
	441
	442	up_write(&crypto_alg_sem);
	443
	444	crypto_mod_put(alg);
	445
	446	return 0;
	447	}
	448
9aa867e4 HX	449	static int crypto_del_rng(struct sk_buff skb, struct nlmsghdr nlh,
	450	struct nlattr **attrs)
	451	{
	452	if (!netlink_capable(skb, CAP_NET_ADMIN))
	453	return -EPERM;
	454	return crypto_del_default_rng();
	455	}
	456
a38f7907 SK	457	#define MSGSIZE(type) sizeof(struct type)
	458
	459	static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
	460	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	461	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	462	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
055ddaac	463	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
9aa867e4	464	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
cac5818c	465	[CRYPTO_MSG_GETSTAT - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
a38f7907 SK	466	};
	467
	468	static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
	469	[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
	470	};
	471
	472	#undef MSGSIZE
	473
a84fb791	474	static const struct crypto_link {
a38f7907 SK	475	int (doit)(struct sk_buff , struct nlmsghdr , struct nlattr *);
	476	int (dump)(struct sk_buff , struct netlink_callback *);
	477	int (done)(struct netlink_callback );
	478	} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
	479	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
	480	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
	481	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
	482	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
	483	.dump = crypto_dump_report,
	484	.done = crypto_dump_report_done},
9aa867e4	485	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
cac5818c CL	486	[CRYPTO_MSG_GETSTAT - CRYPTO_MSG_BASE] = { .doit = crypto_reportstat,
	487	.dump = crypto_dump_reportstat,
	488	.done = crypto_dump_reportstat_done},
a38f7907 SK	489	};
a38f7907 SK	490
2d4bc933 JB	491	static int crypto_user_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh,
2d4bc933 JB	492	struct netlink_ext_ack *extack)
a38f7907 SK	493	{
a38f7907 SK	494	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
a84fb791	495	const struct crypto_link *link;
a38f7907 SK	496	int type, err;
	497
	498	type = nlh->nlmsg_type;
	499	if (type > CRYPTO_MSG_MAX)
	500	return -EINVAL;
	501
	502	type -= CRYPTO_MSG_BASE;
	503	link = &crypto_dispatch[type];
	504
a38f7907 SK	505	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
a38f7907 SK	506	(nlh->nlmsg_flags & NLM_F_DUMP))) {
5219a534 SK	507	struct crypto_alg *alg;
	508	u16 dump_alloc = 0;
	509
a38f7907 SK	510	if (link->dump == NULL)
a38f7907 SK	511	return -EINVAL;
5219a534	512
63e41ebc	513	down_read(&crypto_alg_sem);
5219a534 SK	514	list_for_each_entry(alg, &crypto_alg_list, cra_list)
	515	dump_alloc += CRYPTO_REPORT_MAXSIZE;
	516
80d326fa PNA	517	{
	518	struct netlink_dump_control c = {
	519	.dump = link->dump,
	520	.done = link->done,
5219a534	521	.min_dump_alloc = dump_alloc,
80d326fa	522	};
63e41ebc	523	err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
80d326fa	524	}
63e41ebc MK	525	up_read(&crypto_alg_sem);
	526
	527	return err;
a38f7907 SK	528	}
a38f7907 SK	529
fd2efd93	530	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
fe52145f	531	crypto_policy, extack);
fd2efd93 HX	532	if (err < 0)
fd2efd93 HX	533	return err;
a38f7907 SK	534
	535	if (link->doit == NULL)
	536	return -EINVAL;
	537
	538	return link->doit(skb, nlh, attrs);
	539	}
	540
	541	static void crypto_netlink_rcv(struct sk_buff *skb)
	542	{
	543	mutex_lock(&crypto_cfg_mutex);
	544	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
	545	mutex_unlock(&crypto_cfg_mutex);
	546	}
	547
	548	static int __init crypto_user_init(void)
	549	{
a31f2d17 PNA	550	struct netlink_kernel_cfg cfg = {
	551	.input = crypto_netlink_rcv,
	552	};
	553
9f00d977	554	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
a38f7907 SK	555	if (!crypto_nlsk)
	556	return -ENOMEM;
	557
	558	return 0;
	559	}
	560
	561	static void __exit crypto_user_exit(void)
	562	{
	563	netlink_kernel_release(crypto_nlsk);
	564	}
	565
	566	module_init(crypto_user_init);
	567	module_exit(crypto_user_exit);
	568	MODULE_LICENSE("GPL");
	569	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	570	MODULE_DESCRIPTION("Crypto userspace configuration API");
476c7fe2	571	MODULE_ALIAS("net-pf-16-proto-21");