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1 | /* |
2 | * Crypto user configuration API. |
3 | * |
4 | * Copyright (C) 2011 secunet Security Networks AG |
5 | * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com> |
6 | * |
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. |
10 | * |
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. |
15 | * |
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. |
19 | */ |
20 | |
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> |
30 | |
31 | #include "internal.h" |
32 | |
33 | #define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x)) |
34 | |
35 | static DEFINE_MUTEX(crypto_cfg_mutex); |
36 | |
37 | /* The crypto netlink socket */ |
38 | static struct sock *crypto_nlsk; |
39 | |
40 | struct crypto_dump_info { |
41 | struct sk_buff *in_skb; |
42 | struct sk_buff *out_skb; |
43 | u32 nlmsg_seq; |
44 | u16 nlmsg_flags; |
45 | }; |
46 | |
47 | static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact) |
48 | { |
49 | struct crypto_alg *q, *alg = NULL; |
50 | |
51 | down_read(&crypto_alg_sem); |
52 | |
53 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
54 | int match = 0; |
55 | |
56 | if ((q->cra_flags ^ p->cru_type) & p->cru_mask) |
57 | continue; |
58 | |
59 | if (strlen(p->cru_driver_name)) |
60 | match = !strcmp(q->cra_driver_name, |
61 | p->cru_driver_name); |
62 | else if (!exact) |
63 | match = !strcmp(q->cra_name, p->cru_name); |
64 | |
65 | if (match) { |
66 | alg = q; |
67 | break; |
68 | } |
69 | } |
70 | |
71 | up_read(&crypto_alg_sem); |
72 | |
73 | return alg; |
74 | } |
75 | |
76 | static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg) |
77 | { |
78 | struct crypto_report_cipher rcipher; |
79 | |
80 | strncpy(rcipher.type, "cipher", sizeof(rcipher.type)); |
81 | |
82 | rcipher.blocksize = alg->cra_blocksize; |
83 | rcipher.min_keysize = alg->cra_cipher.cia_min_keysize; |
84 | rcipher.max_keysize = alg->cra_cipher.cia_max_keysize; |
85 | |
86 | if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER, |
87 | sizeof(struct crypto_report_cipher), &rcipher)) |
88 | goto nla_put_failure; |
89 | return 0; |
90 | |
91 | nla_put_failure: |
92 | return -EMSGSIZE; |
93 | } |
94 | |
95 | static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg) |
96 | { |
97 | struct crypto_report_comp rcomp; |
98 | |
99 | strncpy(rcomp.type, "compression", sizeof(rcomp.type)); |
100 | if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, |
101 | sizeof(struct crypto_report_comp), &rcomp)) |
102 | goto nla_put_failure; |
103 | return 0; |
104 | |
105 | nla_put_failure: |
106 | return -EMSGSIZE; |
107 | } |
108 | |
109 | static int crypto_report_one(struct crypto_alg *alg, |
110 | struct crypto_user_alg *ualg, struct sk_buff *skb) |
111 | { |
112 | strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name)); |
113 | strncpy(ualg->cru_driver_name, alg->cra_driver_name, |
114 | sizeof(ualg->cru_driver_name)); |
115 | strncpy(ualg->cru_module_name, module_name(alg->cra_module), |
116 | sizeof(ualg->cru_module_name)); |
117 | |
118 | ualg->cru_type = 0; |
119 | ualg->cru_mask = 0; |
120 | ualg->cru_flags = alg->cra_flags; |
121 | ualg->cru_refcnt = atomic_read(&alg->cra_refcnt); |
122 | |
123 | if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority)) |
124 | goto nla_put_failure; |
125 | if (alg->cra_flags & CRYPTO_ALG_LARVAL) { |
126 | struct crypto_report_larval rl; |
127 | |
128 | strncpy(rl.type, "larval", sizeof(rl.type)); |
129 | if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, |
130 | sizeof(struct crypto_report_larval), &rl)) |
131 | goto nla_put_failure; |
132 | goto out; |
133 | } |
134 | |
135 | if (alg->cra_type && alg->cra_type->report) { |
136 | if (alg->cra_type->report(skb, alg)) |
137 | goto nla_put_failure; |
138 | |
139 | goto out; |
140 | } |
141 | |
142 | switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) { |
143 | case CRYPTO_ALG_TYPE_CIPHER: |
144 | if (crypto_report_cipher(skb, alg)) |
145 | goto nla_put_failure; |
146 | |
147 | break; |
148 | case CRYPTO_ALG_TYPE_COMPRESS: |
149 | if (crypto_report_comp(skb, alg)) |
150 | goto nla_put_failure; |
151 | |
152 | break; |
153 | } |
154 | |
155 | out: |
156 | return 0; |
157 | |
158 | nla_put_failure: |
159 | return -EMSGSIZE; |
160 | } |
161 | |
162 | static int crypto_report_alg(struct crypto_alg *alg, |
163 | struct crypto_dump_info *info) |
164 | { |
165 | struct sk_buff *in_skb = info->in_skb; |
166 | struct sk_buff *skb = info->out_skb; |
167 | struct nlmsghdr *nlh; |
168 | struct crypto_user_alg *ualg; |
169 | int err = 0; |
170 | |
171 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq, |
172 | CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags); |
173 | if (!nlh) { |
174 | err = -EMSGSIZE; |
175 | goto out; |
176 | } |
177 | |
178 | ualg = nlmsg_data(nlh); |
179 | |
180 | err = crypto_report_one(alg, ualg, skb); |
181 | if (err) { |
182 | nlmsg_cancel(skb, nlh); |
183 | goto out; |
184 | } |
185 | |
186 | nlmsg_end(skb, nlh); |
187 | |
188 | out: |
189 | return err; |
190 | } |
191 | |
192 | static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, |
193 | struct nlattr **attrs) |
194 | { |
195 | struct crypto_user_alg *p = nlmsg_data(in_nlh); |
196 | struct crypto_alg *alg; |
197 | struct sk_buff *skb; |
198 | struct crypto_dump_info info; |
199 | int err; |
200 | |
201 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
202 | return -EINVAL; |
203 | |
204 | if (!p->cru_driver_name[0]) |
205 | return -EINVAL; |
206 | |
207 | alg = crypto_alg_match(p, 1); |
208 | if (!alg) |
209 | return -ENOENT; |
210 | |
211 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
212 | if (!skb) |
213 | return -ENOMEM; |
214 | |
215 | info.in_skb = in_skb; |
216 | info.out_skb = skb; |
217 | info.nlmsg_seq = in_nlh->nlmsg_seq; |
218 | info.nlmsg_flags = 0; |
219 | |
220 | err = crypto_report_alg(alg, &info); |
221 | if (err) |
222 | return err; |
223 | |
224 | return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid); |
225 | } |
226 | |
227 | static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb) |
228 | { |
229 | struct crypto_alg *alg; |
230 | struct crypto_dump_info info; |
231 | int err; |
232 | |
233 | if (cb->args[0]) |
234 | goto out; |
235 | |
236 | cb->args[0] = 1; |
237 | |
238 | info.in_skb = cb->skb; |
239 | info.out_skb = skb; |
240 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
241 | info.nlmsg_flags = NLM_F_MULTI; |
242 | |
243 | list_for_each_entry(alg, &crypto_alg_list, cra_list) { |
244 | err = crypto_report_alg(alg, &info); |
245 | if (err) |
246 | goto out_err; |
247 | } |
248 | |
249 | out: |
250 | return skb->len; |
251 | out_err: |
252 | return err; |
253 | } |
254 | |
255 | static int crypto_dump_report_done(struct netlink_callback *cb) |
256 | { |
257 | return 0; |
258 | } |
259 | |
260 | static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
261 | struct nlattr **attrs) |
262 | { |
263 | struct crypto_alg *alg; |
264 | struct crypto_user_alg *p = nlmsg_data(nlh); |
265 | struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; |
266 | LIST_HEAD(list); |
267 | |
268 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
269 | return -EINVAL; |
270 | |
271 | if (priority && !strlen(p->cru_driver_name)) |
272 | return -EINVAL; |
273 | |
274 | alg = crypto_alg_match(p, 1); |
275 | if (!alg) |
276 | return -ENOENT; |
277 | |
278 | down_write(&crypto_alg_sem); |
279 | |
280 | crypto_remove_spawns(alg, &list, NULL); |
281 | |
282 | if (priority) |
283 | alg->cra_priority = nla_get_u32(priority); |
284 | |
285 | up_write(&crypto_alg_sem); |
286 | |
287 | crypto_remove_final(&list); |
288 | |
289 | return 0; |
290 | } |
291 | |
292 | static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
293 | struct nlattr **attrs) |
294 | { |
295 | struct crypto_alg *alg; |
296 | struct crypto_user_alg *p = nlmsg_data(nlh); |
297 | |
298 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
299 | return -EINVAL; |
300 | |
301 | alg = crypto_alg_match(p, 1); |
302 | if (!alg) |
303 | return -ENOENT; |
304 | |
305 | /* We can not unregister core algorithms such as aes-generic. |
306 | * We would loose the reference in the crypto_alg_list to this algorithm |
307 | * if we try to unregister. Unregistering such an algorithm without |
308 | * removing the module is not possible, so we restrict to crypto |
309 | * instances that are build from templates. */ |
310 | if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) |
311 | return -EINVAL; |
312 | |
313 | if (atomic_read(&alg->cra_refcnt) != 1) |
314 | return -EBUSY; |
315 | |
316 | return crypto_unregister_instance(alg); |
317 | } |
318 | |
319 | static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type, |
320 | u32 mask) |
321 | { |
322 | int err; |
323 | struct crypto_alg *alg; |
324 | |
325 | type = crypto_skcipher_type(type); |
326 | mask = crypto_skcipher_mask(mask); |
327 | |
328 | for (;;) { |
329 | alg = crypto_lookup_skcipher(name, type, mask); |
330 | if (!IS_ERR(alg)) |
331 | return alg; |
332 | |
333 | err = PTR_ERR(alg); |
334 | if (err != -EAGAIN) |
335 | break; |
336 | if (signal_pending(current)) { |
337 | err = -EINTR; |
338 | break; |
339 | } |
340 | } |
341 | |
342 | return ERR_PTR(err); |
343 | } |
344 | |
345 | static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type, |
346 | u32 mask) |
347 | { |
348 | int err; |
349 | struct crypto_alg *alg; |
350 | |
351 | type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); |
352 | type |= CRYPTO_ALG_TYPE_AEAD; |
353 | mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); |
354 | mask |= CRYPTO_ALG_TYPE_MASK; |
355 | |
356 | for (;;) { |
357 | alg = crypto_lookup_aead(name, type, mask); |
358 | if (!IS_ERR(alg)) |
359 | return alg; |
360 | |
361 | err = PTR_ERR(alg); |
362 | if (err != -EAGAIN) |
363 | break; |
364 | if (signal_pending(current)) { |
365 | err = -EINTR; |
366 | break; |
367 | } |
368 | } |
369 | |
370 | return ERR_PTR(err); |
371 | } |
372 | |
373 | static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
374 | struct nlattr **attrs) |
375 | { |
376 | int exact = 0; |
377 | const char *name; |
378 | struct crypto_alg *alg; |
379 | struct crypto_user_alg *p = nlmsg_data(nlh); |
380 | struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; |
381 | |
382 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
383 | return -EINVAL; |
384 | |
385 | if (strlen(p->cru_driver_name)) |
386 | exact = 1; |
387 | |
388 | if (priority && !exact) |
389 | return -EINVAL; |
390 | |
391 | alg = crypto_alg_match(p, exact); |
392 | if (alg) |
393 | return -EEXIST; |
394 | |
395 | if (strlen(p->cru_driver_name)) |
396 | name = p->cru_driver_name; |
397 | else |
398 | name = p->cru_name; |
399 | |
400 | switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) { |
401 | case CRYPTO_ALG_TYPE_AEAD: |
402 | alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask); |
403 | break; |
404 | case CRYPTO_ALG_TYPE_GIVCIPHER: |
405 | case CRYPTO_ALG_TYPE_BLKCIPHER: |
406 | case CRYPTO_ALG_TYPE_ABLKCIPHER: |
407 | alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask); |
408 | break; |
409 | default: |
410 | alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask); |
411 | } |
412 | |
413 | if (IS_ERR(alg)) |
414 | return PTR_ERR(alg); |
415 | |
416 | down_write(&crypto_alg_sem); |
417 | |
418 | if (priority) |
419 | alg->cra_priority = nla_get_u32(priority); |
420 | |
421 | up_write(&crypto_alg_sem); |
422 | |
423 | crypto_mod_put(alg); |
424 | |
425 | return 0; |
426 | } |
427 | |
428 | #define MSGSIZE(type) sizeof(struct type) |
429 | |
430 | static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = { |
431 | [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
432 | [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
433 | [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
434 | [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
435 | }; |
436 | |
437 | static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = { |
438 | [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32}, |
439 | }; |
440 | |
441 | #undef MSGSIZE |
442 | |
443 | static struct crypto_link { |
444 | int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
445 | int (*dump)(struct sk_buff *, struct netlink_callback *); |
446 | int (*done)(struct netlink_callback *); |
447 | } crypto_dispatch[CRYPTO_NR_MSGTYPES] = { |
448 | [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg}, |
449 | [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg}, |
450 | [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg}, |
451 | [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report, |
452 | .dump = crypto_dump_report, |
453 | .done = crypto_dump_report_done}, |
454 | }; |
455 | |
456 | static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
457 | { |
458 | struct nlattr *attrs[CRYPTOCFGA_MAX+1]; |
459 | struct crypto_link *link; |
460 | int type, err; |
461 | |
462 | type = nlh->nlmsg_type; |
463 | if (type > CRYPTO_MSG_MAX) |
464 | return -EINVAL; |
465 | |
466 | type -= CRYPTO_MSG_BASE; |
467 | link = &crypto_dispatch[type]; |
468 | |
469 | if (!capable(CAP_NET_ADMIN)) |
470 | return -EPERM; |
471 | |
472 | if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) && |
473 | (nlh->nlmsg_flags & NLM_F_DUMP))) { |
474 | struct crypto_alg *alg; |
475 | u16 dump_alloc = 0; |
476 | |
477 | if (link->dump == NULL) |
478 | return -EINVAL; |
479 | |
480 | list_for_each_entry(alg, &crypto_alg_list, cra_list) |
481 | dump_alloc += CRYPTO_REPORT_MAXSIZE; |
482 | |
483 | { |
484 | struct netlink_dump_control c = { |
485 | .dump = link->dump, |
486 | .done = link->done, |
487 | .min_dump_alloc = dump_alloc, |
488 | }; |
489 | return netlink_dump_start(crypto_nlsk, skb, nlh, &c); |
490 | } |
491 | } |
492 | |
493 | err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX, |
494 | crypto_policy); |
495 | if (err < 0) |
496 | return err; |
497 | |
498 | if (link->doit == NULL) |
499 | return -EINVAL; |
500 | |
501 | return link->doit(skb, nlh, attrs); |
502 | } |
503 | |
504 | static void crypto_netlink_rcv(struct sk_buff *skb) |
505 | { |
506 | mutex_lock(&crypto_cfg_mutex); |
507 | netlink_rcv_skb(skb, &crypto_user_rcv_msg); |
508 | mutex_unlock(&crypto_cfg_mutex); |
509 | } |
510 | |
511 | static int __init crypto_user_init(void) |
512 | { |
513 | struct netlink_kernel_cfg cfg = { |
514 | .input = crypto_netlink_rcv, |
515 | }; |
516 | |
517 | crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg); |
518 | if (!crypto_nlsk) |
519 | return -ENOMEM; |
520 | |
521 | return 0; |
522 | } |
523 | |
524 | static void __exit crypto_user_exit(void) |
525 | { |
526 | netlink_kernel_release(crypto_nlsk); |
527 | } |
528 | |
529 | module_init(crypto_user_init); |
530 | module_exit(crypto_user_exit); |
531 | MODULE_LICENSE("GPL"); |
532 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); |
533 | MODULE_DESCRIPTION("Crypto userspace configuration API"); |
534 |
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