Merge tag 'fixes-for-v3.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi...
[linux/fpc-iii.git] / crypto / crypto_user.c
blob35d700a97d79bc926de0b599041e59e7e07c0721
1 /*
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
14 * more details.
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>
31 #include "internal.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;
41 u32 nlmsg_seq;
42 u16 nlmsg_flags;
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) {
52 int match = 0;
54 if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
55 continue;
57 if (strlen(p->cru_driver_name))
58 match = !strcmp(q->cra_driver_name,
59 p->cru_driver_name);
60 else if (!exact)
61 match = !strcmp(q->cra_name, p->cru_name);
63 if (match) {
64 alg = q;
65 break;
69 up_read(&crypto_alg_sem);
71 return alg;
74 static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
76 struct crypto_report_cipher rcipher;
78 snprintf(rcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "cipher");
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))
86 goto nla_put_failure;
87 return 0;
89 nla_put_failure:
90 return -EMSGSIZE;
93 static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
95 struct crypto_report_comp rcomp;
97 snprintf(rcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "compression");
99 if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
100 sizeof(struct crypto_report_comp), &rcomp))
101 goto nla_put_failure;
102 return 0;
104 nla_put_failure:
105 return -EMSGSIZE;
108 static int crypto_report_one(struct crypto_alg *alg,
109 struct crypto_user_alg *ualg, struct sk_buff *skb)
111 memcpy(&ualg->cru_name, &alg->cra_name, sizeof(ualg->cru_name));
112 memcpy(&ualg->cru_driver_name, &alg->cra_driver_name,
113 sizeof(ualg->cru_driver_name));
114 memcpy(&ualg->cru_module_name, module_name(alg->cra_module),
115 CRYPTO_MAX_ALG_NAME);
117 ualg->cru_flags = alg->cra_flags;
118 ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
120 if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
121 goto nla_put_failure;
122 if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
123 struct crypto_report_larval rl;
125 snprintf(rl.type, CRYPTO_MAX_ALG_NAME, "%s", "larval");
127 if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
128 sizeof(struct crypto_report_larval), &rl))
129 goto nla_put_failure;
130 goto out;
133 if (alg->cra_type && alg->cra_type->report) {
134 if (alg->cra_type->report(skb, alg))
135 goto nla_put_failure;
137 goto out;
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;
145 break;
146 case CRYPTO_ALG_TYPE_COMPRESS:
147 if (crypto_report_comp(skb, alg))
148 goto nla_put_failure;
150 break;
153 out:
154 return 0;
156 nla_put_failure:
157 return -EMSGSIZE;
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;
167 int err = 0;
169 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
170 CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
171 if (!nlh) {
172 err = -EMSGSIZE;
173 goto out;
176 ualg = nlmsg_data(nlh);
178 err = crypto_report_one(alg, ualg, skb);
179 if (err) {
180 nlmsg_cancel(skb, nlh);
181 goto out;
184 nlmsg_end(skb, nlh);
186 out:
187 return err;
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;
195 struct sk_buff *skb;
196 struct crypto_dump_info info;
197 int err;
199 if (!p->cru_driver_name)
200 return -EINVAL;
202 alg = crypto_alg_match(p, 1);
203 if (!alg)
204 return -ENOENT;
206 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
207 if (!skb)
208 return -ENOMEM;
210 info.in_skb = in_skb;
211 info.out_skb = skb;
212 info.nlmsg_seq = in_nlh->nlmsg_seq;
213 info.nlmsg_flags = 0;
215 err = crypto_report_alg(alg, &info);
216 if (err)
217 return err;
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;
226 int err;
228 if (cb->args[0])
229 goto out;
231 cb->args[0] = 1;
233 info.in_skb = cb->skb;
234 info.out_skb = 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);
240 if (err)
241 goto out_err;
244 out:
245 return skb->len;
246 out_err:
247 return err;
250 static int crypto_dump_report_done(struct netlink_callback *cb)
252 return 0;
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];
261 LIST_HEAD(list);
263 if (priority && !strlen(p->cru_driver_name))
264 return -EINVAL;
266 alg = crypto_alg_match(p, 1);
267 if (!alg)
268 return -ENOENT;
270 down_write(&crypto_alg_sem);
272 crypto_remove_spawns(alg, &list, NULL);
274 if (priority)
275 alg->cra_priority = nla_get_u32(priority);
277 up_write(&crypto_alg_sem);
279 crypto_remove_final(&list);
281 return 0;
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);
291 if (!alg)
292 return -ENOENT;
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))
300 return -EINVAL;
302 if (atomic_read(&alg->cra_refcnt) != 1)
303 return -EBUSY;
305 return crypto_unregister_instance(alg);
308 static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type,
309 u32 mask)
311 int err;
312 struct crypto_alg *alg;
314 type = crypto_skcipher_type(type);
315 mask = crypto_skcipher_mask(mask);
317 for (;;) {
318 alg = crypto_lookup_skcipher(name, type, mask);
319 if (!IS_ERR(alg))
320 return alg;
322 err = PTR_ERR(alg);
323 if (err != -EAGAIN)
324 break;
325 if (signal_pending(current)) {
326 err = -EINTR;
327 break;
331 return ERR_PTR(err);
334 static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type,
335 u32 mask)
337 int err;
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;
345 for (;;) {
346 alg = crypto_lookup_aead(name, type, mask);
347 if (!IS_ERR(alg))
348 return alg;
350 err = PTR_ERR(alg);
351 if (err != -EAGAIN)
352 break;
353 if (signal_pending(current)) {
354 err = -EINTR;
355 break;
359 return ERR_PTR(err);
362 static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
363 struct nlattr **attrs)
365 int exact = 0;
366 const char *name;
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))
372 exact = 1;
374 if (priority && !exact)
375 return -EINVAL;
377 alg = crypto_alg_match(p, exact);
378 if (alg)
379 return -EEXIST;
381 if (strlen(p->cru_driver_name))
382 name = p->cru_driver_name;
383 else
384 name = p->cru_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);
389 break;
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);
394 break;
395 default:
396 alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
399 if (IS_ERR(alg))
400 return PTR_ERR(alg);
402 down_write(&crypto_alg_sem);
404 if (priority)
405 alg->cra_priority = nla_get_u32(priority);
407 up_write(&crypto_alg_sem);
409 crypto_mod_put(alg);
411 return 0;
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},
427 #undef MSGSIZE
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;
446 int type, err;
448 type = nlh->nlmsg_type;
449 if (type > CRYPTO_MSG_MAX)
450 return -EINVAL;
452 type -= CRYPTO_MSG_BASE;
453 link = &crypto_dispatch[type];
455 if (!capable(CAP_NET_ADMIN))
456 return -EPERM;
458 if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
459 (nlh->nlmsg_flags & NLM_F_DUMP))) {
460 struct crypto_alg *alg;
461 u16 dump_alloc = 0;
463 if (link->dump == NULL)
464 return -EINVAL;
466 list_for_each_entry(alg, &crypto_alg_list, cra_list)
467 dump_alloc += CRYPTO_REPORT_MAXSIZE;
470 struct netlink_dump_control c = {
471 .dump = link->dump,
472 .done = link->done,
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,
480 crypto_policy);
481 if (err < 0)
482 return err;
484 if (link->doit == NULL)
485 return -EINVAL;
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);
504 if (!crypto_nlsk)
505 return -ENOMEM;
507 return 0;
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");