2 * Crypto user configuration API.
4 * Copyright (C) 2011 secunet Security Networks AG
5 * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
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.
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
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.
21 #include <linux/module.h>
22 #include <linux/crypto.h>
23 #include <linux/cryptouser.h>
24 #include <linux/sched.h>
25 #include <net/netlink.h>
26 #include <linux/security.h>
27 #include <net/net_namespace.h>
28 #include <crypto/internal/aead.h>
29 #include <crypto/internal/skcipher.h>
33 static DEFINE_MUTEX(crypto_cfg_mutex);
35 /* The crypto netlink socket */
36 static struct sock *crypto_nlsk;
38 struct crypto_dump_info {
39 struct sk_buff *in_skb;
40 struct sk_buff *out_skb;
45 static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
47 struct crypto_alg *q, *alg = NULL;
49 down_read(&crypto_alg_sem);
51 list_for_each_entry(q, &crypto_alg_list, cra_list) {
54 if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
57 if (strlen(p->cru_driver_name))
58 match = !strcmp(q->cra_driver_name,
61 match = !strcmp(q->cra_name, p->cru_name);
69 up_read(&crypto_alg_sem);
74 static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
76 struct crypto_report_cipher rcipher;
78 strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
80 rcipher.blocksize = alg->cra_blocksize;
81 rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
82 rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
84 if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
85 sizeof(struct crypto_report_cipher), &rcipher))
93 static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
95 struct crypto_report_comp rcomp;
97 strncpy(rcomp.type, "compression", sizeof(rcomp.type));
98 if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
99 sizeof(struct crypto_report_comp), &rcomp))
100 goto nla_put_failure;
107 static int crypto_report_one(struct crypto_alg *alg,
108 struct crypto_user_alg *ualg, struct sk_buff *skb)
110 strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
111 strncpy(ualg->cru_driver_name, alg->cra_driver_name,
112 sizeof(ualg->cru_driver_name));
113 strncpy(ualg->cru_module_name, module_name(alg->cra_module),
114 sizeof(ualg->cru_module_name));
118 ualg->cru_flags = alg->cra_flags;
119 ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
121 if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
122 goto nla_put_failure;
123 if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
124 struct crypto_report_larval rl;
126 strncpy(rl.type, "larval", sizeof(rl.type));
127 if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
128 sizeof(struct crypto_report_larval), &rl))
129 goto nla_put_failure;
133 if (alg->cra_type && alg->cra_type->report) {
134 if (alg->cra_type->report(skb, alg))
135 goto nla_put_failure;
140 switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
141 case CRYPTO_ALG_TYPE_CIPHER:
142 if (crypto_report_cipher(skb, alg))
143 goto nla_put_failure;
146 case CRYPTO_ALG_TYPE_COMPRESS:
147 if (crypto_report_comp(skb, alg))
148 goto nla_put_failure;
160 static int crypto_report_alg(struct crypto_alg *alg,
161 struct crypto_dump_info *info)
163 struct sk_buff *in_skb = info->in_skb;
164 struct sk_buff *skb = info->out_skb;
165 struct nlmsghdr *nlh;
166 struct crypto_user_alg *ualg;
169 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
170 CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
176 ualg = nlmsg_data(nlh);
178 err = crypto_report_one(alg, ualg, skb);
180 nlmsg_cancel(skb, nlh);
190 static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
191 struct nlattr **attrs)
193 struct crypto_user_alg *p = nlmsg_data(in_nlh);
194 struct crypto_alg *alg;
196 struct crypto_dump_info info;
199 if (!p->cru_driver_name[0])
202 alg = crypto_alg_match(p, 1);
206 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
210 info.in_skb = in_skb;
212 info.nlmsg_seq = in_nlh->nlmsg_seq;
213 info.nlmsg_flags = 0;
215 err = crypto_report_alg(alg, &info);
219 return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
222 static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
224 struct crypto_alg *alg;
225 struct crypto_dump_info info;
233 info.in_skb = cb->skb;
235 info.nlmsg_seq = cb->nlh->nlmsg_seq;
236 info.nlmsg_flags = NLM_F_MULTI;
238 list_for_each_entry(alg, &crypto_alg_list, cra_list) {
239 err = crypto_report_alg(alg, &info);
250 static int crypto_dump_report_done(struct netlink_callback *cb)
255 static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
256 struct nlattr **attrs)
258 struct crypto_alg *alg;
259 struct crypto_user_alg *p = nlmsg_data(nlh);
260 struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
263 if (priority && !strlen(p->cru_driver_name))
266 alg = crypto_alg_match(p, 1);
270 down_write(&crypto_alg_sem);
272 crypto_remove_spawns(alg, &list, NULL);
275 alg->cra_priority = nla_get_u32(priority);
277 up_write(&crypto_alg_sem);
279 crypto_remove_final(&list);
284 static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
285 struct nlattr **attrs)
287 struct crypto_alg *alg;
288 struct crypto_user_alg *p = nlmsg_data(nlh);
290 alg = crypto_alg_match(p, 1);
294 /* We can not unregister core algorithms such as aes-generic.
295 * We would loose the reference in the crypto_alg_list to this algorithm
296 * if we try to unregister. Unregistering such an algorithm without
297 * removing the module is not possible, so we restrict to crypto
298 * instances that are build from templates. */
299 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
302 if (atomic_read(&alg->cra_refcnt) != 1)
305 return crypto_unregister_instance(alg);
308 static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type,
312 struct crypto_alg *alg;
314 type = crypto_skcipher_type(type);
315 mask = crypto_skcipher_mask(mask);
318 alg = crypto_lookup_skcipher(name, type, mask);
325 if (signal_pending(current)) {
334 static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type,
338 struct crypto_alg *alg;
340 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
341 type |= CRYPTO_ALG_TYPE_AEAD;
342 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
343 mask |= CRYPTO_ALG_TYPE_MASK;
346 alg = crypto_lookup_aead(name, type, mask);
353 if (signal_pending(current)) {
362 static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
363 struct nlattr **attrs)
367 struct crypto_alg *alg;
368 struct crypto_user_alg *p = nlmsg_data(nlh);
369 struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
371 if (strlen(p->cru_driver_name))
374 if (priority && !exact)
377 alg = crypto_alg_match(p, exact);
381 if (strlen(p->cru_driver_name))
382 name = p->cru_driver_name;
386 switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) {
387 case CRYPTO_ALG_TYPE_AEAD:
388 alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask);
390 case CRYPTO_ALG_TYPE_GIVCIPHER:
391 case CRYPTO_ALG_TYPE_BLKCIPHER:
392 case CRYPTO_ALG_TYPE_ABLKCIPHER:
393 alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask);
396 alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
402 down_write(&crypto_alg_sem);
405 alg->cra_priority = nla_get_u32(priority);
407 up_write(&crypto_alg_sem);
414 #define MSGSIZE(type) sizeof(struct type)
416 static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
417 [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
418 [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
419 [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
420 [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
423 static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
424 [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
429 static struct crypto_link {
430 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
431 int (*dump)(struct sk_buff *, struct netlink_callback *);
432 int (*done)(struct netlink_callback *);
433 } crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
434 [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
435 [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
436 [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
437 [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
438 .dump = crypto_dump_report,
439 .done = crypto_dump_report_done},
442 static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
444 struct nlattr *attrs[CRYPTOCFGA_MAX+1];
445 struct crypto_link *link;
448 type = nlh->nlmsg_type;
449 if (type > CRYPTO_MSG_MAX)
452 type -= CRYPTO_MSG_BASE;
453 link = &crypto_dispatch[type];
455 if (!capable(CAP_NET_ADMIN))
458 if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
459 (nlh->nlmsg_flags & NLM_F_DUMP))) {
460 struct crypto_alg *alg;
463 if (link->dump == NULL)
466 list_for_each_entry(alg, &crypto_alg_list, cra_list)
467 dump_alloc += CRYPTO_REPORT_MAXSIZE;
470 struct netlink_dump_control c = {
473 .min_dump_alloc = dump_alloc,
475 return netlink_dump_start(crypto_nlsk, skb, nlh, &c);
479 err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
484 if (link->doit == NULL)
487 return link->doit(skb, nlh, attrs);
490 static void crypto_netlink_rcv(struct sk_buff *skb)
492 mutex_lock(&crypto_cfg_mutex);
493 netlink_rcv_skb(skb, &crypto_user_rcv_msg);
494 mutex_unlock(&crypto_cfg_mutex);
497 static int __init crypto_user_init(void)
499 struct netlink_kernel_cfg cfg = {
500 .input = crypto_netlink_rcv,
503 crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
510 static void __exit crypto_user_exit(void)
512 netlink_kernel_release(crypto_nlsk);
515 module_init(crypto_user_init);
516 module_exit(crypto_user_exit);
517 MODULE_LICENSE("GPL");
518 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
519 MODULE_DESCRIPTION("Crypto userspace configuration API");