[linux-2.6-block.git] / crypto / crypto_user_base.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 <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 (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 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)
{
	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;

	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},
};

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;
		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(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 __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
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 SK	13	#include <net/netlink.h>
	14	#include <linux/security.h>
	15	#include <net/net_namespace.h>
1e122994	16	#include <crypto/internal/skcipher.h>
9aa867e4	17	#include <crypto/internal/rng.h>
3c339ab8	18	#include <crypto/akcipher.h>
4e5f2c40	19	#include <crypto/kpp.h>
cac5818c	20	#include <crypto/internal/cryptouser.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 SK	27
a38f7907 SK	28	/* The crypto netlink socket */
cac5818c	29	struct sock *crypto_nlsk;
a38f7907 SK	30
	31	struct crypto_dump_info {
	32	struct sk_buff *in_skb;
	33	struct sk_buff *out_skb;
	34	u32 nlmsg_seq;
	35	u16 nlmsg_flags;
	36	};
	37
cac5818c	38	struct crypto_alg crypto_alg_match(struct crypto_user_alg p, int exact)
a38f7907	39	{
a38f7907 SK	40	struct crypto_alg q, alg = NULL;
	41
	42	down_read(&crypto_alg_sem);
	43
a38f7907	44	list_for_each_entry(q, &crypto_alg_list, cra_list) {
e6ea64ec	45	int match = 0;
a38f7907	46
21d4120e EB	47	if (crypto_is_larval(q))
	48	continue;
	49
a38f7907 SK	50	if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
	51	continue;
	52
	53	if (strlen(p->cru_driver_name))
	54	match = !strcmp(q->cra_driver_name,
	55	p->cru_driver_name);
	56	else if (!exact)
	57	match = !strcmp(q->cra_name, p->cru_name);
	58
016baaa1 HX	59	if (!match)
	60	continue;
	61
	62	if (unlikely(!crypto_mod_get(q)))
	63	continue;
	64
	65	alg = q;
	66	break;
a38f7907 SK	67	}
	68
	69	up_read(&crypto_alg_sem);
	70
	71	return alg;
	72	}
	73
07a5fa4a SK	74	static int crypto_report_cipher(struct sk_buff skb, struct crypto_alg alg)
	75	{
	76	struct crypto_report_cipher rcipher;
	77
37db69e0 EB	78	memset(&rcipher, 0, sizeof(rcipher));
	79
	80	strscpy(rcipher.type, "cipher", sizeof(rcipher.type));
07a5fa4a SK	81
	82	rcipher.blocksize = alg->cra_blocksize;
	83	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
	84	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
	85
37db69e0 EB	86	return nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
37db69e0 EB	87	sizeof(rcipher), &rcipher);
07a5fa4a SK	88	}
07a5fa4a SK	89
540b97c1 SK	90	static int crypto_report_comp(struct sk_buff skb, struct crypto_alg alg)
	91	{
	92	struct crypto_report_comp rcomp;
	93
37db69e0 EB	94	memset(&rcomp, 0, sizeof(rcomp));
	95
	96	strscpy(rcomp.type, "compression", sizeof(rcomp.type));
540b97c1	97
37db69e0	98	return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, sizeof(rcomp), &rcomp);
540b97c1 SK	99	}
540b97c1 SK	100
a38f7907 SK	101	static int crypto_report_one(struct crypto_alg *alg,
	102	struct crypto_user_alg ualg, struct sk_buff skb)
	103	{
37db69e0 EB	104	memset(ualg, 0, sizeof(*ualg));
	105
	106	strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
	107	strscpy(ualg->cru_driver_name, alg->cra_driver_name,
9a5467bf	108	sizeof(ualg->cru_driver_name));
37db69e0	109	strscpy(ualg->cru_module_name, module_name(alg->cra_module),
9a5467bf MK	110	sizeof(ualg->cru_module_name));
	111
	112	ualg->cru_type = 0;
	113	ualg->cru_mask = 0;
a38f7907	114	ualg->cru_flags = alg->cra_flags;
ce8614a3	115	ualg->cru_refcnt = refcount_read(&alg->cra_refcnt);
a38f7907	116
6662df33 DM	117	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
6662df33 DM	118	goto nla_put_failure;
6c5a86f5 SK	119	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
	120	struct crypto_report_larval rl;
	121
37db69e0 EB	122	memset(&rl, 0, sizeof(rl));
	123	strscpy(rl.type, "larval", sizeof(rl.type));
	124	if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, sizeof(rl), &rl))
6662df33	125	goto nla_put_failure;
6c5a86f5 SK	126	goto out;
	127	}
	128
b6aa63c0 SK	129	if (alg->cra_type && alg->cra_type->report) {
	130	if (alg->cra_type->report(skb, alg))
	131	goto nla_put_failure;
07a5fa4a SK	132
	133	goto out;
	134	}
	135
	136	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_LARVAL)) {
	137	case CRYPTO_ALG_TYPE_CIPHER:
	138	if (crypto_report_cipher(skb, alg))
	139	goto nla_put_failure;
	140
540b97c1 SK	141	break;
	142	case CRYPTO_ALG_TYPE_COMPRESS:
	143	if (crypto_report_comp(skb, alg))
	144	goto nla_put_failure;
	145
07a5fa4a	146	break;
b6aa63c0 SK	147	}
b6aa63c0 SK	148
6c5a86f5	149	out:
a38f7907 SK	150	return 0;
	151
	152	nla_put_failure:
	153	return -EMSGSIZE;
	154	}
	155
	156	static int crypto_report_alg(struct crypto_alg *alg,
	157	struct crypto_dump_info *info)
	158	{
	159	struct sk_buff *in_skb = info->in_skb;
	160	struct sk_buff *skb = info->out_skb;
	161	struct nlmsghdr *nlh;
	162	struct crypto_user_alg *ualg;
	163	int err = 0;
	164
15e47304	165	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
a38f7907 SK	166	CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	167	if (!nlh) {
	168	err = -EMSGSIZE;
	169	goto out;
	170	}
	171
	172	ualg = nlmsg_data(nlh);
	173
	174	err = crypto_report_one(alg, ualg, skb);
	175	if (err) {
	176	nlmsg_cancel(skb, nlh);
	177	goto out;
	178	}
	179
	180	nlmsg_end(skb, nlh);
	181
	182	out:
	183	return err;
	184	}
	185
	186	static int crypto_report(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	187	struct nlattr **attrs)
	188	{
	189	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	190	struct crypto_alg *alg;
	191	struct sk_buff *skb;
	192	struct crypto_dump_info info;
	193	int err;
	194
8fd61d34 MK	195	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	196	return -EINVAL;
	197
5d4a5e77	198	alg = crypto_alg_match(p, 0);
a38f7907 SK	199	if (!alg)
	200	return -ENOENT;
	201
016baaa1	202	err = -ENOMEM;
9a69b7ae	203	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
a38f7907	204	if (!skb)
016baaa1	205	goto drop_alg;
a38f7907 SK	206
	207	info.in_skb = in_skb;
	208	info.out_skb = skb;
	209	info.nlmsg_seq = in_nlh->nlmsg_seq;
	210	info.nlmsg_flags = 0;
	211
	212	err = crypto_report_alg(alg, &info);
016baaa1 HX	213
	214	drop_alg:
	215	crypto_mod_put(alg);
	216
a38f7907 SK	217	if (err)
	218	return err;
	219
15e47304	220	return nlmsg_unicast(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
016baaa1 HX	325	err = crypto_unregister_instance((struct crypto_instance *)alg);
	326
	327	drop_alg:
	328	crypto_mod_put(alg);
	329	return err;
a38f7907 SK	330	}
	331
	332	static int crypto_add_alg(struct sk_buff skb, struct nlmsghdr nlh,
	333	struct nlattr **attrs)
	334	{
0cfdec7a	335	int exact = 0;
a38f7907 SK	336	const char *name;
	337	struct crypto_alg *alg;
	338	struct crypto_user_alg *p = nlmsg_data(nlh);
	339	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	340
639b4ac6	341	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	342	return -EPERM;
c568398a MCO	343
8fd61d34 MK	344	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	345	return -EINVAL;
	346
a38f7907 SK	347	if (strlen(p->cru_driver_name))
	348	exact = 1;
	349
	350	if (priority && !exact)
	351	return -EINVAL;
	352
	353	alg = crypto_alg_match(p, exact);
016baaa1 HX	354	if (alg) {
016baaa1 HX	355	crypto_mod_put(alg);
a38f7907	356	return -EEXIST;
016baaa1	357	}
a38f7907 SK	358
	359	if (strlen(p->cru_driver_name))
	360	name = p->cru_driver_name;
	361	else
	362	name = p->cru_name;
	363
6cf80a29	364	alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
a38f7907 SK	365	if (IS_ERR(alg))
	366	return PTR_ERR(alg);
	367
	368	down_write(&crypto_alg_sem);
	369
	370	if (priority)
	371	alg->cra_priority = nla_get_u32(priority);
	372
	373	up_write(&crypto_alg_sem);
	374
	375	crypto_mod_put(alg);
	376
	377	return 0;
	378	}
	379
9aa867e4 HX	380	static int crypto_del_rng(struct sk_buff skb, struct nlmsghdr nlh,
	381	struct nlattr **attrs)
	382	{
	383	if (!netlink_capable(skb, CAP_NET_ADMIN))
	384	return -EPERM;
	385	return crypto_del_default_rng();
	386	}
	387
a38f7907 SK	388	#define MSGSIZE(type) sizeof(struct type)
	389
	390	static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
	391	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	392	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	393	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
055ddaac	394	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
9aa867e4	395	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
cac5818c	396	[CRYPTO_MSG_GETSTAT - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
a38f7907 SK	397	};
	398
	399	static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
	400	[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
	401	};
	402
	403	#undef MSGSIZE
	404
a84fb791	405	static const struct crypto_link {
a38f7907 SK	406	int (doit)(struct sk_buff , struct nlmsghdr , struct nlattr *);
	407	int (dump)(struct sk_buff , struct netlink_callback *);
	408	int (done)(struct netlink_callback );
	409	} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
	410	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
	411	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
	412	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
	413	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
	414	.dump = crypto_dump_report,
	415	.done = crypto_dump_report_done},
9aa867e4	416	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
0c99c2a0	417	[CRYPTO_MSG_GETSTAT - CRYPTO_MSG_BASE] = { .doit = crypto_reportstat},
a38f7907 SK	418	};
a38f7907 SK	419
2d4bc933 JB	420	static int crypto_user_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh,
2d4bc933 JB	421	struct netlink_ext_ack *extack)
a38f7907 SK	422	{
a38f7907 SK	423	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
a84fb791	424	const struct crypto_link *link;
a38f7907 SK	425	int type, err;
	426
	427	type = nlh->nlmsg_type;
	428	if (type > CRYPTO_MSG_MAX)
	429	return -EINVAL;
	430
	431	type -= CRYPTO_MSG_BASE;
	432	link = &crypto_dispatch[type];
	433
a38f7907 SK	434	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
a38f7907 SK	435	(nlh->nlmsg_flags & NLM_F_DUMP))) {
5219a534	436	struct crypto_alg *alg;
0ac6b8fb	437	unsigned long dump_alloc = 0;
5219a534	438
a38f7907 SK	439	if (link->dump == NULL)
a38f7907 SK	440	return -EINVAL;
5219a534	441
63e41ebc	442	down_read(&crypto_alg_sem);
5219a534 SK	443	list_for_each_entry(alg, &crypto_alg_list, cra_list)
5219a534 SK	444	dump_alloc += CRYPTO_REPORT_MAXSIZE;
0ac6b8fb	445	up_read(&crypto_alg_sem);
5219a534	446
80d326fa PNA	447	{
	448	struct netlink_dump_control c = {
	449	.dump = link->dump,
	450	.done = link->done,
0ac6b8fb	451	.min_dump_alloc = min(dump_alloc, 65535UL),
80d326fa	452	};
63e41ebc	453	err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
80d326fa	454	}
63e41ebc MK	455
63e41ebc MK	456	return err;
a38f7907 SK	457	}
a38f7907 SK	458
8cb08174 JB	459	err = nlmsg_parse_deprecated(nlh, crypto_msg_min[type], attrs,
8cb08174 JB	460	CRYPTOCFGA_MAX, crypto_policy, extack);
fd2efd93 HX	461	if (err < 0)
fd2efd93 HX	462	return err;
a38f7907 SK	463
	464	if (link->doit == NULL)
	465	return -EINVAL;
	466
	467	return link->doit(skb, nlh, attrs);
	468	}
	469
	470	static void crypto_netlink_rcv(struct sk_buff *skb)
	471	{
	472	mutex_lock(&crypto_cfg_mutex);
	473	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
	474	mutex_unlock(&crypto_cfg_mutex);
	475	}
	476
	477	static int __init crypto_user_init(void)
	478	{
a31f2d17 PNA	479	struct netlink_kernel_cfg cfg = {
	480	.input = crypto_netlink_rcv,
	481	};
	482
9f00d977	483	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
a38f7907 SK	484	if (!crypto_nlsk)
	485	return -ENOMEM;
	486
	487	return 0;
	488	}
	489
	490	static void __exit crypto_user_exit(void)
	491	{
	492	netlink_kernel_release(crypto_nlsk);
	493	}
	494
	495	module_init(crypto_user_init);
	496	module_exit(crypto_user_exit);
	497	MODULE_LICENSE("GPL");
	498	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	499	MODULE_DESCRIPTION("Crypto userspace configuration API");
476c7fe2	500	MODULE_ALIAS("net-pf-16-proto-21");