/* * Crypto user configuration API. * * Copyright (C) 2011 secunet Security Networks AG * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com> * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. */ #include <linux/module.h>#include <linux/crypto.h>#include <linux/cryptouser.h>#include <linux/sched.h>#include <net/netlink.h>#include <linux/security.h>#include <net/net_namespace.h>#include <crypto/internal/aead.h>#include <crypto/internal/skcipher.h> #include "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) {			alg = q;			break;		}	} 	up_read(&crypto_alg_sem); 	return alg;} static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg){	struct crypto_report_cipher rcipher; 	strncpy(rcipher.type, "cipher", sizeof(rcipher.type)); 	rcipher.blocksize = alg->cra_blocksize;	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize; 	if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,		    sizeof(struct crypto_report_cipher), &rcipher))		goto nla_put_failure;	return 0; nla_put_failure:	return -EMSGSIZE;} static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg){	struct crypto_report_comp rcomp; 	strncpy(rcomp.type, "compression", sizeof(rcomp.type));	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,		    sizeof(struct crypto_report_comp), &rcomp))		goto nla_put_failure;	return 0; nla_put_failure:	return -EMSGSIZE;} static int crypto_report_one(struct crypto_alg *alg,			     struct crypto_user_alg *ualg, struct sk_buff *skb){	strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));	strncpy(ualg->cru_driver_name, alg->cra_driver_name,		sizeof(ualg->cru_driver_name));	strncpy(ualg->cru_module_name, module_name(alg->cra_module),		sizeof(ualg->cru_module_name)); 	ualg->cru_type = 0;	ualg->cru_mask = 0;	ualg->cru_flags = alg->cra_flags;	ualg->cru_refcnt = atomic_read(&alg->cra_refcnt); 	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))		goto nla_put_failure;	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {		struct crypto_report_larval rl; 		strncpy(rl.type, "larval", sizeof(rl.type));		if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,			    sizeof(struct crypto_report_larval), &rl))			goto nla_put_failure;		goto out;	} 	if (alg->cra_type && alg->cra_type->report) {		if (alg->cra_type->report(skb, alg))			goto nla_put_failure; 		goto out;	} 	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {	case CRYPTO_ALG_TYPE_CIPHER:		if (crypto_report_cipher(skb, alg))			goto nla_put_failure; 		break;	case CRYPTO_ALG_TYPE_COMPRESS:		if (crypto_report_comp(skb, alg))			goto nla_put_failure; 		break;	} 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; 	if (!p->cru_driver_name[0])		return -EINVAL; 	alg = crypto_alg_match(p, 1);	if (!alg)		return -ENOENT; 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);	if (!skb)		return -ENOMEM; 	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);	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 (!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_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); 	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. */	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))		return -EINVAL; 	if (atomic_read(&alg->cra_refcnt) != 1)		return -EBUSY; 	return crypto_unregister_instance(alg);} static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type,						   u32 mask){	int err;	struct crypto_alg *alg; 	type = crypto_skcipher_type(type);	mask = crypto_skcipher_mask(mask); 	for (;;) {		alg = crypto_lookup_skcipher(name,  type, mask);		if (!IS_ERR(alg))			return alg; 		err = PTR_ERR(alg);		if (err != -EAGAIN)			break;		if (signal_pending(current)) {			err = -EINTR;			break;		}	} 	return ERR_PTR(err);} static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type,					       u32 mask){	int err;	struct crypto_alg *alg; 	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);	type |= CRYPTO_ALG_TYPE_AEAD;	mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);	mask |= CRYPTO_ALG_TYPE_MASK; 	for (;;) {		alg = crypto_lookup_aead(name,  type, mask);		if (!IS_ERR(alg))			return alg; 		err = PTR_ERR(alg);		if (err != -EAGAIN)			break;		if (signal_pending(current)) {			err = -EINTR;			break;		}	} 	return ERR_PTR(err);} static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,			  struct nlattr **attrs){	int exact = 0;	const char *name;	struct crypto_alg *alg;	struct crypto_user_alg *p = nlmsg_data(nlh);	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; 	if (!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)		return -EEXIST; 	if (strlen(p->cru_driver_name))		name = p->cru_driver_name;	else		name = p->cru_name; 	switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) {	case CRYPTO_ALG_TYPE_AEAD:		alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask);		break;	case CRYPTO_ALG_TYPE_GIVCIPHER:	case CRYPTO_ALG_TYPE_BLKCIPHER:	case CRYPTO_ALG_TYPE_ABLKCIPHER:		alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask);		break;	default:		alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);	} 	if (IS_ERR(alg))		return PTR_ERR(alg); 	down_write(&crypto_alg_sem); 	if (priority)		alg->cra_priority = nla_get_u32(priority); 	up_write(&crypto_alg_sem); 	crypto_mod_put(alg); 	return 0;} #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),}; 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},}; static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh){	struct nlattr *attrs[CRYPTOCFGA_MAX+1];	const struct crypto_link *link;	int type, err; 	type = nlh->nlmsg_type;	if (type > CRYPTO_MSG_MAX)		return -EINVAL; 	type -= CRYPTO_MSG_BASE;	link = &crypto_dispatch[type]; 	if (!capable(CAP_NET_ADMIN))		return -EPERM; 	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&	    (nlh->nlmsg_flags & NLM_F_DUMP))) {		struct crypto_alg *alg;		u16 dump_alloc = 0; 		if (link->dump == NULL)			return -EINVAL; 		list_for_each_entry(alg, &crypto_alg_list, cra_list)			dump_alloc += CRYPTO_REPORT_MAXSIZE; 		{			struct netlink_dump_control c = {				.dump = link->dump,				.done = link->done,				.min_dump_alloc = dump_alloc,			};			return netlink_dump_start(crypto_nlsk, skb, nlh, &c);		}	} 	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,			  crypto_policy);	if (err < 0)		return err; 	if (link->doit == NULL)		return -EINVAL; 

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