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/skcipher.h>
29 #include <crypto/internal/rng.h>
30 #include <crypto/akcipher.h>
31 #include <crypto/kpp.h>
35 #define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
37 static DEFINE_MUTEX(crypto_cfg_mutex);
39 /* The crypto netlink socket */
40 static struct sock *crypto_nlsk;
42 struct crypto_dump_info {
43 struct sk_buff *in_skb;
44 struct sk_buff *out_skb;
49 static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
51 struct crypto_alg *q, *alg = NULL;
53 down_read(&crypto_alg_sem);
55 list_for_each_entry(q, &crypto_alg_list, cra_list) {
58 if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
61 if (strlen(p->cru_driver_name))
62 match = !strcmp(q->cra_driver_name,
65 match = !strcmp(q->cra_name, p->cru_name);
70 if (unlikely(!crypto_mod_get(q)))
77 up_read(&crypto_alg_sem);
82 static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
84 struct crypto_report_cipher rcipher;
86 strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
88 rcipher.blocksize = alg->cra_blocksize;
89 rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
90 rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
92 if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
93 sizeof(struct crypto_report_cipher), &rcipher))
101 static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
103 struct crypto_report_comp rcomp;
105 strncpy(rcomp.type, "compression", sizeof(rcomp.type));
106 if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
107 sizeof(struct crypto_report_comp), &rcomp))
108 goto nla_put_failure;
115 static int crypto_report_acomp(struct sk_buff *skb, struct crypto_alg *alg)
117 struct crypto_report_acomp racomp;
119 strncpy(racomp.type, "acomp", sizeof(racomp.type));
121 if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
122 sizeof(struct crypto_report_acomp), &racomp))
123 goto nla_put_failure;
130 static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
132 struct crypto_report_akcipher rakcipher;
134 strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
136 if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
137 sizeof(struct crypto_report_akcipher), &rakcipher))
138 goto nla_put_failure;
145 static int crypto_report_kpp(struct sk_buff *skb, struct crypto_alg *alg)
147 struct crypto_report_kpp rkpp;
149 strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
151 if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
152 sizeof(struct crypto_report_kpp), &rkpp))
153 goto nla_put_failure;
160 static int crypto_report_one(struct crypto_alg *alg,
161 struct crypto_user_alg *ualg, struct sk_buff *skb)
163 strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
164 strncpy(ualg->cru_driver_name, alg->cra_driver_name,
165 sizeof(ualg->cru_driver_name));
166 strncpy(ualg->cru_module_name, module_name(alg->cra_module),
167 sizeof(ualg->cru_module_name));
171 ualg->cru_flags = alg->cra_flags;
172 ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
174 if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
175 goto nla_put_failure;
176 if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
177 struct crypto_report_larval rl;
179 strncpy(rl.type, "larval", sizeof(rl.type));
180 if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
181 sizeof(struct crypto_report_larval), &rl))
182 goto nla_put_failure;
186 if (alg->cra_type && alg->cra_type->report) {
187 if (alg->cra_type->report(skb, alg))
188 goto nla_put_failure;
193 switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
194 case CRYPTO_ALG_TYPE_CIPHER:
195 if (crypto_report_cipher(skb, alg))
196 goto nla_put_failure;
199 case CRYPTO_ALG_TYPE_COMPRESS:
200 if (crypto_report_comp(skb, alg))
201 goto nla_put_failure;
204 case CRYPTO_ALG_TYPE_ACOMPRESS:
205 if (crypto_report_acomp(skb, alg))
206 goto nla_put_failure;
209 case CRYPTO_ALG_TYPE_AKCIPHER:
210 if (crypto_report_akcipher(skb, alg))
211 goto nla_put_failure;
214 case CRYPTO_ALG_TYPE_KPP:
215 if (crypto_report_kpp(skb, alg))
216 goto nla_put_failure;
227 static int crypto_report_alg(struct crypto_alg *alg,
228 struct crypto_dump_info *info)
230 struct sk_buff *in_skb = info->in_skb;
231 struct sk_buff *skb = info->out_skb;
232 struct nlmsghdr *nlh;
233 struct crypto_user_alg *ualg;
236 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
237 CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
243 ualg = nlmsg_data(nlh);
245 err = crypto_report_one(alg, ualg, skb);
247 nlmsg_cancel(skb, nlh);
257 static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
258 struct nlattr **attrs)
260 struct crypto_user_alg *p = nlmsg_data(in_nlh);
261 struct crypto_alg *alg;
263 struct crypto_dump_info info;
266 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
269 alg = crypto_alg_match(p, 0);
274 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
278 info.in_skb = in_skb;
280 info.nlmsg_seq = in_nlh->nlmsg_seq;
281 info.nlmsg_flags = 0;
283 err = crypto_report_alg(alg, &info);
291 return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
294 static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
296 struct crypto_alg *alg;
297 struct crypto_dump_info info;
305 info.in_skb = cb->skb;
307 info.nlmsg_seq = cb->nlh->nlmsg_seq;
308 info.nlmsg_flags = NLM_F_MULTI;
310 list_for_each_entry(alg, &crypto_alg_list, cra_list) {
311 err = crypto_report_alg(alg, &info);
322 static int crypto_dump_report_done(struct netlink_callback *cb)
327 static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
328 struct nlattr **attrs)
330 struct crypto_alg *alg;
331 struct crypto_user_alg *p = nlmsg_data(nlh);
332 struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
335 if (!netlink_capable(skb, CAP_NET_ADMIN))
338 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
341 if (priority && !strlen(p->cru_driver_name))
344 alg = crypto_alg_match(p, 1);
348 down_write(&crypto_alg_sem);
350 crypto_remove_spawns(alg, &list, NULL);
353 alg->cra_priority = nla_get_u32(priority);
355 up_write(&crypto_alg_sem);
358 crypto_remove_final(&list);
363 static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
364 struct nlattr **attrs)
366 struct crypto_alg *alg;
367 struct crypto_user_alg *p = nlmsg_data(nlh);
370 if (!netlink_capable(skb, CAP_NET_ADMIN))
373 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
376 alg = crypto_alg_match(p, 1);
380 /* We can not unregister core algorithms such as aes-generic.
381 * We would loose the reference in the crypto_alg_list to this algorithm
382 * if we try to unregister. Unregistering such an algorithm without
383 * removing the module is not possible, so we restrict to crypto
384 * instances that are build from templates. */
386 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
390 if (atomic_read(&alg->cra_refcnt) > 2)
393 err = crypto_unregister_instance((struct crypto_instance *)alg);
400 static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
401 struct nlattr **attrs)
405 struct crypto_alg *alg;
406 struct crypto_user_alg *p = nlmsg_data(nlh);
407 struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
409 if (!netlink_capable(skb, CAP_NET_ADMIN))
412 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
415 if (strlen(p->cru_driver_name))
418 if (priority && !exact)
421 alg = crypto_alg_match(p, exact);
427 if (strlen(p->cru_driver_name))
428 name = p->cru_driver_name;
432 alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
436 down_write(&crypto_alg_sem);
439 alg->cra_priority = nla_get_u32(priority);
441 up_write(&crypto_alg_sem);
448 static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh,
449 struct nlattr **attrs)
451 if (!netlink_capable(skb, CAP_NET_ADMIN))
453 return crypto_del_default_rng();
456 #define MSGSIZE(type) sizeof(struct type)
458 static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
459 [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
460 [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
461 [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
462 [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
463 [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
466 static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
467 [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
472 static const struct crypto_link {
473 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
474 int (*dump)(struct sk_buff *, struct netlink_callback *);
475 int (*done)(struct netlink_callback *);
476 } crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
477 [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
478 [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
479 [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
480 [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
481 .dump = crypto_dump_report,
482 .done = crypto_dump_report_done},
483 [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
486 static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
487 struct netlink_ext_ack *extack)
489 struct nlattr *attrs[CRYPTOCFGA_MAX+1];
490 const struct crypto_link *link;
493 type = nlh->nlmsg_type;
494 if (type > CRYPTO_MSG_MAX)
497 type -= CRYPTO_MSG_BASE;
498 link = &crypto_dispatch[type];
500 if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
501 (nlh->nlmsg_flags & NLM_F_DUMP))) {
502 struct crypto_alg *alg;
505 if (link->dump == NULL)
508 down_read(&crypto_alg_sem);
509 list_for_each_entry(alg, &crypto_alg_list, cra_list)
510 dump_alloc += CRYPTO_REPORT_MAXSIZE;
513 struct netlink_dump_control c = {
516 .min_dump_alloc = dump_alloc,
518 err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
520 up_read(&crypto_alg_sem);
525 err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
526 crypto_policy, NULL);
530 if (link->doit == NULL)
533 return link->doit(skb, nlh, attrs);
536 static void crypto_netlink_rcv(struct sk_buff *skb)
538 mutex_lock(&crypto_cfg_mutex);
539 netlink_rcv_skb(skb, &crypto_user_rcv_msg);
540 mutex_unlock(&crypto_cfg_mutex);
543 static int __init crypto_user_init(void)
545 struct netlink_kernel_cfg cfg = {
546 .input = crypto_netlink_rcv,
549 crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
556 static void __exit crypto_user_exit(void)
558 netlink_kernel_release(crypto_nlsk);
561 module_init(crypto_user_init);
562 module_exit(crypto_user_exit);
563 MODULE_LICENSE("GPL");
564 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
565 MODULE_DESCRIPTION("Crypto userspace configuration API");
566 MODULE_ALIAS("net-pf-16-proto-21");