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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Crypto user configuration API.
 *
 * Copyright (C) 2011 secunet Security Networks AG
 * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
 */

#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/cryptouser.h>
#include <linux/sched.h>
#include <linux/security.h>
#include <net/netlink.h>
#include <net/net_namespace.h>
#include <net/sock.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);

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 (crypto_is_larval(q))
			continue;

		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;

	memset(&rcipher, 0, sizeof(rcipher));

	strscpy(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;

	return nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
		       sizeof(rcipher), &rcipher);
}

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

	memset(&rcomp, 0, sizeof(rcomp));

	strscpy(rcomp.type, "compression", sizeof(rcomp.type));

	return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, sizeof(rcomp), &rcomp);
}

static int crypto_report_one(struct crypto_alg *alg,
			     struct crypto_user_alg *ualg, struct sk_buff *skb)
{
	memset(ualg, 0, sizeof(*ualg));

	strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
	strscpy(ualg->cru_driver_name, alg->cra_driver_name,
		sizeof(ualg->cru_driver_name));
	strscpy(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;

		memset(&rl, 0, sizeof(rl));
		strscpy(rl.type, "larval", sizeof(rl.type));
		if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, sizeof(rl), &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;
	}

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 net *net = sock_net(in_skb->sk);
	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) {
		kfree_skb(skb);
		return err;
	}

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

static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
{
	const size_t start_pos = cb->args[0];
	size_t pos = 0;
	struct crypto_dump_info info;
	struct crypto_alg *alg;
	int res;

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

	down_read(&crypto_alg_sem);
	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
		if (pos >= start_pos) {
			res = crypto_report_alg(alg, &info);
			if (res == -EMSGSIZE)
				break;
			if (res)
				goto out;
		}
		pos++;
	}
	cb->args[0] = pos;
	res = skb->len;
out:
	up_read(&crypto_alg_sem);
	return res;
}

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;

	crypto_unregister_instance((struct crypto_instance *)alg);
	err = 0;

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();
}

static int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
			     struct nlattr **attrs)
{
	/* No longer supported */
	return -ENOTSUPP;
}

#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},
};

static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
			       struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	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;
		unsigned long 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;
		up_read(&crypto_alg_sem);

		{
			struct netlink_dump_control c = {
				.dump = link->dump,
				.done = link->done,
				.min_dump_alloc = min(dump_alloc, 65535UL),
			};
			err = netlink_dump_start(net->crypto_nlsk, skb, nlh, &c);
		}

		return err;
	}

	err = nlmsg_parse_deprecated(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 __net_init crypto_netlink_init(struct net *net)
{
	struct netlink_kernel_cfg cfg = {
		.input	= crypto_netlink_rcv,
	};

	net->crypto_nlsk = netlink_kernel_create(net, NETLINK_CRYPTO, &cfg);
	return net->crypto_nlsk == NULL ? -ENOMEM : 0;
}

static void __net_exit crypto_netlink_exit(struct net *net)
{
	netlink_kernel_release(net->crypto_nlsk);
	net->crypto_nlsk = NULL;
}

static struct pernet_operations crypto_netlink_net_ops = {
	.init = crypto_netlink_init,
	.exit = crypto_netlink_exit,
};

static int __init crypto_user_init(void)
{
	return register_pernet_subsys(&crypto_netlink_net_ops);
}

static void __exit crypto_user_exit(void)
{
	unregister_pernet_subsys(&crypto_netlink_net_ops);
}

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
a61127c2	1	// SPDX-License-Identifier: GPL-2.0-only
a38f7907 SK	2	/*
	3	* Crypto user configuration API.
	4	*
	5	* Copyright (C) 2011 secunet Security Networks AG
	6	* Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
a38f7907 SK	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/crypto.h>
	11	#include <linux/cryptouser.h>
1e122994	12	#include <linux/sched.h>
a38f7907	13	#include <linux/security.h>
91b05a7e	14	#include <net/netlink.h>
a38f7907	15	#include <net/net_namespace.h>
91b05a7e	16	#include <net/sock.h>
1e122994	17	#include <crypto/internal/skcipher.h>
9aa867e4	18	#include <crypto/internal/rng.h>
3c339ab8	19	#include <crypto/akcipher.h>
4e5f2c40	20	#include <crypto/kpp.h>
1e122994	21
a38f7907 SK	22	#include "internal.h"
a38f7907 SK	23
8fd61d34 MK	24	#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
8fd61d34 MK	25
66ce0b0f	26	static DEFINE_MUTEX(crypto_cfg_mutex);
a38f7907	27
a38f7907 SK	28	struct crypto_dump_info {
	29	struct sk_buff *in_skb;
	30	struct sk_buff *out_skb;
	31	u32 nlmsg_seq;
	32	u16 nlmsg_flags;
	33	};
	34
29ce50e0	35	static struct crypto_alg crypto_alg_match(struct crypto_user_alg p, int exact)
a38f7907	36	{
a38f7907 SK	37	struct crypto_alg q, alg = NULL;
	38
	39	down_read(&crypto_alg_sem);
	40
a38f7907	41	list_for_each_entry(q, &crypto_alg_list, cra_list) {
e6ea64ec	42	int match = 0;
a38f7907	43
21d4120e EB	44	if (crypto_is_larval(q))
	45	continue;
	46
a38f7907 SK	47	if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
	48	continue;
	49
	50	if (strlen(p->cru_driver_name))
	51	match = !strcmp(q->cra_driver_name,
	52	p->cru_driver_name);
	53	else if (!exact)
	54	match = !strcmp(q->cra_name, p->cru_name);
	55
016baaa1 HX	56	if (!match)
	57	continue;
	58
	59	if (unlikely(!crypto_mod_get(q)))
	60	continue;
	61
	62	alg = q;
	63	break;
a38f7907 SK	64	}
	65
	66	up_read(&crypto_alg_sem);
	67
	68	return alg;
	69	}
	70
07a5fa4a SK	71	static int crypto_report_cipher(struct sk_buff skb, struct crypto_alg alg)
	72	{
	73	struct crypto_report_cipher rcipher;
	74
37db69e0 EB	75	memset(&rcipher, 0, sizeof(rcipher));
	76
	77	strscpy(rcipher.type, "cipher", sizeof(rcipher.type));
07a5fa4a SK	78
	79	rcipher.blocksize = alg->cra_blocksize;
	80	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
	81	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
	82
37db69e0 EB	83	return nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
37db69e0 EB	84	sizeof(rcipher), &rcipher);
07a5fa4a SK	85	}
07a5fa4a SK	86
540b97c1 SK	87	static int crypto_report_comp(struct sk_buff skb, struct crypto_alg alg)
	88	{
	89	struct crypto_report_comp rcomp;
	90
37db69e0 EB	91	memset(&rcomp, 0, sizeof(rcomp));
	92
	93	strscpy(rcomp.type, "compression", sizeof(rcomp.type));
540b97c1	94
37db69e0	95	return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, sizeof(rcomp), &rcomp);
540b97c1 SK	96	}
540b97c1 SK	97
a38f7907 SK	98	static int crypto_report_one(struct crypto_alg *alg,
	99	struct crypto_user_alg ualg, struct sk_buff skb)
	100	{
37db69e0 EB	101	memset(ualg, 0, sizeof(*ualg));
	102
	103	strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
	104	strscpy(ualg->cru_driver_name, alg->cra_driver_name,
9a5467bf	105	sizeof(ualg->cru_driver_name));
37db69e0	106	strscpy(ualg->cru_module_name, module_name(alg->cra_module),
9a5467bf MK	107	sizeof(ualg->cru_module_name));
	108
	109	ualg->cru_type = 0;
	110	ualg->cru_mask = 0;
a38f7907	111	ualg->cru_flags = alg->cra_flags;
ce8614a3	112	ualg->cru_refcnt = refcount_read(&alg->cra_refcnt);
a38f7907	113
6662df33 DM	114	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
6662df33 DM	115	goto nla_put_failure;
6c5a86f5 SK	116	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
	117	struct crypto_report_larval rl;
	118
37db69e0 EB	119	memset(&rl, 0, sizeof(rl));
	120	strscpy(rl.type, "larval", sizeof(rl.type));
	121	if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, sizeof(rl), &rl))
6662df33	122	goto nla_put_failure;
6c5a86f5 SK	123	goto out;
	124	}
	125
b6aa63c0 SK	126	if (alg->cra_type && alg->cra_type->report) {
	127	if (alg->cra_type->report(skb, alg))
	128	goto nla_put_failure;
07a5fa4a SK	129
	130	goto out;
	131	}
	132
	133	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_LARVAL)) {
	134	case CRYPTO_ALG_TYPE_CIPHER:
	135	if (crypto_report_cipher(skb, alg))
	136	goto nla_put_failure;
	137
540b97c1 SK	138	break;
	139	case CRYPTO_ALG_TYPE_COMPRESS:
	140	if (crypto_report_comp(skb, alg))
	141	goto nla_put_failure;
	142
07a5fa4a	143	break;
b6aa63c0 SK	144	}
b6aa63c0 SK	145
6c5a86f5	146	out:
a38f7907 SK	147	return 0;
	148
	149	nla_put_failure:
	150	return -EMSGSIZE;
	151	}
	152
	153	static int crypto_report_alg(struct crypto_alg *alg,
	154	struct crypto_dump_info *info)
	155	{
	156	struct sk_buff *in_skb = info->in_skb;
	157	struct sk_buff *skb = info->out_skb;
	158	struct nlmsghdr *nlh;
	159	struct crypto_user_alg *ualg;
	160	int err = 0;
	161
15e47304	162	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
a38f7907 SK	163	CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	164	if (!nlh) {
	165	err = -EMSGSIZE;
	166	goto out;
	167	}
	168
	169	ualg = nlmsg_data(nlh);
	170
	171	err = crypto_report_one(alg, ualg, skb);
	172	if (err) {
	173	nlmsg_cancel(skb, nlh);
	174	goto out;
	175	}
	176
	177	nlmsg_end(skb, nlh);
	178
	179	out:
	180	return err;
	181	}
	182
	183	static int crypto_report(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	184	struct nlattr **attrs)
	185	{
91b05a7e	186	struct net *net = sock_net(in_skb->sk);
a38f7907 SK	187	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	188	struct crypto_alg *alg;
	189	struct sk_buff *skb;
	190	struct crypto_dump_info info;
	191	int err;
	192
8fd61d34 MK	193	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	194	return -EINVAL;
	195
5d4a5e77	196	alg = crypto_alg_match(p, 0);
a38f7907 SK	197	if (!alg)
	198	return -ENOENT;
	199
016baaa1	200	err = -ENOMEM;
9a69b7ae	201	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
a38f7907	202	if (!skb)
016baaa1	203	goto drop_alg;
a38f7907 SK	204
	205	info.in_skb = in_skb;
	206	info.out_skb = skb;
	207	info.nlmsg_seq = in_nlh->nlmsg_seq;
	208	info.nlmsg_flags = 0;
	209
	210	err = crypto_report_alg(alg, &info);
016baaa1 HX	211
	212	drop_alg:
	213	crypto_mod_put(alg);
	214
ffdde593 NE	215	if (err) {
ffdde593 NE	216	kfree_skb(skb);
a38f7907	217	return err;
ffdde593	218	}
a38f7907	219
91b05a7e	220	return nlmsg_unicast(net->crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
a38f7907 SK	221	}
	222
	223	static int crypto_dump_report(struct sk_buff skb, struct netlink_callback cb)
	224	{
0ac6b8fb EB	225	const size_t start_pos = cb->args[0];
0ac6b8fb EB	226	size_t pos = 0;
a38f7907	227	struct crypto_dump_info info;
0ac6b8fb EB	228	struct crypto_alg *alg;
0ac6b8fb EB	229	int res;
a38f7907 SK	230
	231	info.in_skb = cb->skb;
	232	info.out_skb = skb;
	233	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	234	info.nlmsg_flags = NLM_F_MULTI;
	235
0ac6b8fb	236	down_read(&crypto_alg_sem);
a38f7907	237	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
0ac6b8fb EB	238	if (pos >= start_pos) {
	239	res = crypto_report_alg(alg, &info);
	240	if (res == -EMSGSIZE)
	241	break;
	242	if (res)
	243	goto out;
	244	}
	245	pos++;
a38f7907	246	}
0ac6b8fb EB	247	cb->args[0] = pos;
0ac6b8fb EB	248	res = skb->len;
a38f7907	249	out:
0ac6b8fb EB	250	up_read(&crypto_alg_sem);
0ac6b8fb EB	251	return res;
a38f7907 SK	252	}
	253
	254	static int crypto_dump_report_done(struct netlink_callback *cb)
	255	{
	256	return 0;
	257	}
	258
	259	static int crypto_update_alg(struct sk_buff skb, struct nlmsghdr nlh,
	260	struct nlattr **attrs)
	261	{
	262	struct crypto_alg *alg;
	263	struct crypto_user_alg *p = nlmsg_data(nlh);
	264	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	265	LIST_HEAD(list);
	266
639b4ac6	267	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	268	return -EPERM;
c568398a MCO	269
8fd61d34 MK	270	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	271	return -EINVAL;
	272
a38f7907 SK	273	if (priority && !strlen(p->cru_driver_name))
	274	return -EINVAL;
	275
	276	alg = crypto_alg_match(p, 1);
	277	if (!alg)
	278	return -ENOENT;
	279
	280	down_write(&crypto_alg_sem);
	281
	282	crypto_remove_spawns(alg, &list, NULL);
	283
	284	if (priority)
	285	alg->cra_priority = nla_get_u32(priority);
	286
	287	up_write(&crypto_alg_sem);
	288
016baaa1	289	crypto_mod_put(alg);
a38f7907 SK	290	crypto_remove_final(&list);
	291
	292	return 0;
	293	}
	294
	295	static int crypto_del_alg(struct sk_buff skb, struct nlmsghdr nlh,
	296	struct nlattr **attrs)
	297	{
	298	struct crypto_alg *alg;
	299	struct crypto_user_alg *p = nlmsg_data(nlh);
016baaa1	300	int err;
a38f7907	301
639b4ac6	302	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	303	return -EPERM;
c568398a MCO	304
8fd61d34 MK	305	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	306	return -EINVAL;
	307
a38f7907 SK	308	alg = crypto_alg_match(p, 1);
	309	if (!alg)
	310	return -ENOENT;
	311
	312	/* We can not unregister core algorithms such as aes-generic.
	313	* We would loose the reference in the crypto_alg_list to this algorithm
	314	* if we try to unregister. Unregistering such an algorithm without
	315	* removing the module is not possible, so we restrict to crypto
	316	* instances that are build from templates. */
016baaa1	317	err = -EINVAL;
a38f7907	318	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
016baaa1	319	goto drop_alg;
a38f7907	320
016baaa1	321	err = -EBUSY;
ce8614a3	322	if (refcount_read(&alg->cra_refcnt) > 2)
016baaa1	323	goto drop_alg;
a38f7907	324
c6d633a9 EB	325	crypto_unregister_instance((struct crypto_instance *)alg);
c6d633a9 EB	326	err = 0;
016baaa1 HX	327
	328	drop_alg:
	329	crypto_mod_put(alg);
	330	return err;
a38f7907 SK	331	}
	332
	333	static int crypto_add_alg(struct sk_buff skb, struct nlmsghdr nlh,
	334	struct nlattr **attrs)
	335	{
0cfdec7a	336	int exact = 0;
a38f7907 SK	337	const char *name;
	338	struct crypto_alg *alg;
	339	struct crypto_user_alg *p = nlmsg_data(nlh);
	340	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	341
639b4ac6	342	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	343	return -EPERM;
c568398a MCO	344
8fd61d34 MK	345	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	346	return -EINVAL;
	347
a38f7907 SK	348	if (strlen(p->cru_driver_name))
	349	exact = 1;
	350
	351	if (priority && !exact)
	352	return -EINVAL;
	353
	354	alg = crypto_alg_match(p, exact);
016baaa1 HX	355	if (alg) {
016baaa1 HX	356	crypto_mod_put(alg);
a38f7907	357	return -EEXIST;
016baaa1	358	}
a38f7907 SK	359
	360	if (strlen(p->cru_driver_name))
	361	name = p->cru_driver_name;
	362	else
	363	name = p->cru_name;
	364
6cf80a29	365	alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
a38f7907 SK	366	if (IS_ERR(alg))
	367	return PTR_ERR(alg);
	368
	369	down_write(&crypto_alg_sem);
	370
	371	if (priority)
	372	alg->cra_priority = nla_get_u32(priority);
	373
	374	up_write(&crypto_alg_sem);
	375
	376	crypto_mod_put(alg);
	377
	378	return 0;
	379	}
	380
9aa867e4 HX	381	static int crypto_del_rng(struct sk_buff skb, struct nlmsghdr nlh,
	382	struct nlattr **attrs)
	383	{
	384	if (!netlink_capable(skb, CAP_NET_ADMIN))
	385	return -EPERM;
	386	return crypto_del_default_rng();
	387	}
	388
29ce50e0 EB	389	static int crypto_reportstat(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	390	struct nlattr **attrs)
	391	{
	392	/* No longer supported */
	393	return -ENOTSUPP;
	394	}
	395
a38f7907 SK	396	#define MSGSIZE(type) sizeof(struct type)
	397
	398	static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
	399	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	400	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	401	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
055ddaac	402	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
9aa867e4	403	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
cac5818c	404	[CRYPTO_MSG_GETSTAT - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
a38f7907 SK	405	};
	406
	407	static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
	408	[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
	409	};
	410
	411	#undef MSGSIZE
	412
a84fb791	413	static const struct crypto_link {
a38f7907 SK	414	int (doit)(struct sk_buff , struct nlmsghdr , struct nlattr *);
	415	int (dump)(struct sk_buff , struct netlink_callback *);
	416	int (done)(struct netlink_callback );
	417	} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
	418	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
	419	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
	420	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
	421	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
	422	.dump = crypto_dump_report,
	423	.done = crypto_dump_report_done},
9aa867e4	424	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
0c99c2a0	425	[CRYPTO_MSG_GETSTAT - CRYPTO_MSG_BASE] = { .doit = crypto_reportstat},
a38f7907 SK	426	};
a38f7907 SK	427
2d4bc933 JB	428	static int crypto_user_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh,
2d4bc933 JB	429	struct netlink_ext_ack *extack)
a38f7907	430	{
91b05a7e	431	struct net *net = sock_net(skb->sk);
a38f7907	432	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
a84fb791	433	const struct crypto_link *link;
a38f7907 SK	434	int type, err;
	435
	436	type = nlh->nlmsg_type;
	437	if (type > CRYPTO_MSG_MAX)
	438	return -EINVAL;
	439
	440	type -= CRYPTO_MSG_BASE;
	441	link = &crypto_dispatch[type];
	442
a38f7907 SK	443	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
a38f7907 SK	444	(nlh->nlmsg_flags & NLM_F_DUMP))) {
5219a534	445	struct crypto_alg *alg;
0ac6b8fb	446	unsigned long dump_alloc = 0;
5219a534	447
a38f7907 SK	448	if (link->dump == NULL)
a38f7907 SK	449	return -EINVAL;
5219a534	450
63e41ebc	451	down_read(&crypto_alg_sem);
5219a534 SK	452	list_for_each_entry(alg, &crypto_alg_list, cra_list)
5219a534 SK	453	dump_alloc += CRYPTO_REPORT_MAXSIZE;
0ac6b8fb	454	up_read(&crypto_alg_sem);
5219a534	455
80d326fa PNA	456	{
	457	struct netlink_dump_control c = {
	458	.dump = link->dump,
	459	.done = link->done,
0ac6b8fb	460	.min_dump_alloc = min(dump_alloc, 65535UL),
80d326fa	461	};
91b05a7e	462	err = netlink_dump_start(net->crypto_nlsk, skb, nlh, &c);
80d326fa	463	}
63e41ebc MK	464
63e41ebc MK	465	return err;
a38f7907 SK	466	}
a38f7907 SK	467
8cb08174 JB	468	err = nlmsg_parse_deprecated(nlh, crypto_msg_min[type], attrs,
8cb08174 JB	469	CRYPTOCFGA_MAX, crypto_policy, extack);
fd2efd93 HX	470	if (err < 0)
fd2efd93 HX	471	return err;
a38f7907 SK	472
	473	if (link->doit == NULL)
	474	return -EINVAL;
	475
	476	return link->doit(skb, nlh, attrs);
	477	}
	478
	479	static void crypto_netlink_rcv(struct sk_buff *skb)
	480	{
	481	mutex_lock(&crypto_cfg_mutex);
	482	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
	483	mutex_unlock(&crypto_cfg_mutex);
	484	}
	485
91b05a7e	486	static int __net_init crypto_netlink_init(struct net *net)
a38f7907	487	{
a31f2d17 PNA	488	struct netlink_kernel_cfg cfg = {
	489	.input = crypto_netlink_rcv,
	490	};
	491
91b05a7e OM	492	net->crypto_nlsk = netlink_kernel_create(net, NETLINK_CRYPTO, &cfg);
	493	return net->crypto_nlsk == NULL ? -ENOMEM : 0;
	494	}
a38f7907	495
91b05a7e OM	496	static void __net_exit crypto_netlink_exit(struct net *net)
	497	{
	498	netlink_kernel_release(net->crypto_nlsk);
	499	net->crypto_nlsk = NULL;
	500	}
	501
	502	static struct pernet_operations crypto_netlink_net_ops = {
	503	.init = crypto_netlink_init,
	504	.exit = crypto_netlink_exit,
	505	};
	506
	507	static int __init crypto_user_init(void)
	508	{
	509	return register_pernet_subsys(&crypto_netlink_net_ops);
a38f7907 SK	510	}
	511
	512	static void __exit crypto_user_exit(void)
	513	{
91b05a7e	514	unregister_pernet_subsys(&crypto_netlink_net_ops);
a38f7907 SK	515	}
	516
	517	module_init(crypto_user_init);
	518	module_exit(crypto_user_exit);
	519	MODULE_LICENSE("GPL");
	520	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	521	MODULE_DESCRIPTION("Crypto userspace configuration API");
476c7fe2	522	MODULE_ALIAS("net-pf-16-proto-21");