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41 results

i2c-core-base.c

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  • crypto_user.c 13.12 KiB
    /*
     * 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 "internal.h"
    
    #define null_terminated(x)	(strnlen(x, sizeof(x)) < sizeof(x))
    
    static DEFINE_MUTEX(crypto_cfg_mutex);
    
    /* The crypto netlink socket */
    static struct sock *crypto_nlsk;
    
    struct crypto_dump_info {
    	struct sk_buff *in_skb;
    	struct sk_buff *out_skb;
    	u32 nlmsg_seq;
    	u16 nlmsg_flags;
    };
    
    static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
    {
    	struct crypto_alg *q, *alg = NULL;
    
    	down_read(&crypto_alg_sem);
    
    	list_for_each_entry(q, &crypto_alg_list, cra_list) {
    		int match = 0;
    
    		if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
    			continue;
    
    		if (strlen(p->cru_driver_name))
    			match = !strcmp(q->cra_driver_name,
    					p->cru_driver_name);
    		else if (!exact)
    			match = !strcmp(q->cra_name, p->cru_name);
    
    		if (!match)
    			continue;
    
    		if (unlikely(!crypto_mod_get(q)))
    			continue;
    
    		alg = q;
    		break;
    	}
    
    	up_read(&crypto_alg_sem);
    
    	return alg;
    }
    
    static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
    {
    	struct crypto_report_cipher rcipher;
    
    	strlcpy(rcipher.type, "cipher", sizeof(rcipher.type));
    
    	rcipher.blocksize = alg->cra_blocksize;
    	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
    	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
    
    	if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
    		    sizeof(struct crypto_report_cipher), &rcipher))
    		goto nla_put_failure;
    	return 0;
    
    nla_put_failure:
    	return -EMSGSIZE;
    }
    
    static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
    {
    	struct crypto_report_comp rcomp;
    
    	strlcpy(rcomp.type, "compression", sizeof(rcomp.type));
    	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
    		    sizeof(struct crypto_report_comp), &rcomp))
    		goto nla_put_failure;
    	return 0;
    
    nla_put_failure:
    	return -EMSGSIZE;
    }
    
    static int crypto_report_acomp(struct sk_buff *skb, struct crypto_alg *alg)
    {
    	struct crypto_report_acomp racomp;
    
    	strlcpy(racomp.type, "acomp", sizeof(racomp.type));
    
    	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
    		    sizeof(struct crypto_report_acomp), &racomp))
    		goto nla_put_failure;
    	return 0;
    
    nla_put_failure:
    	return -EMSGSIZE;
    }
    
    static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
    {
    	struct crypto_report_akcipher rakcipher;
    
    	strlcpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
    
    	if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
    		    sizeof(struct crypto_report_akcipher), &rakcipher))
    		goto nla_put_failure;
    	return 0;
    
    nla_put_failure:
    	return -EMSGSIZE;
    }
    
    static int crypto_report_kpp(struct sk_buff *skb, struct crypto_alg *alg)
    {
    	struct crypto_report_kpp rkpp;
    
    	strlcpy(rkpp.type, "kpp", sizeof(rkpp.type));
    
    	if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
    		    sizeof(struct crypto_report_kpp), &rkpp))
    		goto nla_put_failure;
    	return 0;
    
    nla_put_failure:
    	return -EMSGSIZE;
    }
    
    static int crypto_report_one(struct crypto_alg *alg,
    			     struct crypto_user_alg *ualg, struct sk_buff *skb)
    {
    	strlcpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
    	strlcpy(ualg->cru_driver_name, alg->cra_driver_name,
    		sizeof(ualg->cru_driver_name));
    	strlcpy(ualg->cru_module_name, module_name(alg->cra_module),
    		sizeof(ualg->cru_module_name));
    
    	ualg->cru_type = 0;
    	ualg->cru_mask = 0;
    	ualg->cru_flags = alg->cra_flags;
    	ualg->cru_refcnt = 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,
    };
    
    static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
    	[CRYPTOCFGA_PRIORITY_VAL]   = { .type = NLA_U32},
    };
    
    #undef MSGSIZE
    
    static const struct crypto_link {
    	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
    	int (*dump)(struct sk_buff *, struct netlink_callback *);
    	int (*done)(struct netlink_callback *);
    } crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
    	[CRYPTO_MSG_NEWALG	- CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
    	[CRYPTO_MSG_DELALG	- CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
    	[CRYPTO_MSG_UPDATEALG	- CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
    	[CRYPTO_MSG_GETALG	- CRYPTO_MSG_BASE] = { .doit = crypto_report,
    						       .dump = crypto_dump_report,
    						       .done = crypto_dump_report_done},
    	[CRYPTO_MSG_DELRNG	- CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
    };
    
    static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
    			       struct netlink_ext_ack *extack)
    {
    	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
    	const struct crypto_link *link;
    	int type, err;
    
    	type = nlh->nlmsg_type;
    	if (type > CRYPTO_MSG_MAX)
    		return -EINVAL;
    
    	type -= CRYPTO_MSG_BASE;
    	link = &crypto_dispatch[type];
    
    	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
    	    (nlh->nlmsg_flags & NLM_F_DUMP))) {
    		struct crypto_alg *alg;
    		u16 dump_alloc = 0;
    
    		if (link->dump == NULL)
    			return -EINVAL;
    
    		down_read(&crypto_alg_sem);
    		list_for_each_entry(alg, &crypto_alg_list, cra_list)
    			dump_alloc += CRYPTO_REPORT_MAXSIZE;
    
    		{
    			struct netlink_dump_control c = {
    				.dump = link->dump,
    				.done = link->done,
    				.min_dump_alloc = dump_alloc,
    			};
    			err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
    		}
    		up_read(&crypto_alg_sem);
    
    		return err;
    	}
    
    	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
    			  crypto_policy, extack);
    	if (err < 0)
    		return err;
    
    	if (link->doit == NULL)
    		return -EINVAL;
    
    	return link->doit(skb, nlh, attrs);
    }
    
    static void crypto_netlink_rcv(struct sk_buff *skb)
    {
    	mutex_lock(&crypto_cfg_mutex);
    	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
    	mutex_unlock(&crypto_cfg_mutex);
    }
    
    static int __init crypto_user_init(void)
    {
    	struct netlink_kernel_cfg cfg = {
    		.input	= crypto_netlink_rcv,
    	};
    
    	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
    	if (!crypto_nlsk)
    		return -ENOMEM;
    
    	return 0;
    }
    
    static void __exit crypto_user_exit(void)
    {
    	netlink_kernel_release(crypto_nlsk);
    }
    
    module_init(crypto_user_init);
    module_exit(crypto_user_exit);
    MODULE_LICENSE("GPL");
    MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
    MODULE_DESCRIPTION("Crypto userspace configuration API");
    MODULE_ALIAS("net-pf-16-proto-21");