Commit | Line | Data |
---|---|---|
a38f7907 SK |
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> | |
1e122994 | 24 | #include <linux/sched.h> |
a38f7907 SK |
25 | #include <net/netlink.h> |
26 | #include <linux/security.h> | |
27 | #include <net/net_namespace.h> | |
1e122994 SK |
28 | #include <crypto/internal/aead.h> |
29 | #include <crypto/internal/skcipher.h> | |
30 | ||
a38f7907 SK |
31 | #include "internal.h" |
32 | ||
8fd61d34 MK |
33 | #define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x)) |
34 | ||
66ce0b0f | 35 | static DEFINE_MUTEX(crypto_cfg_mutex); |
a38f7907 SK |
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 | { | |
a38f7907 SK |
49 | struct crypto_alg *q, *alg = NULL; |
50 | ||
51 | down_read(&crypto_alg_sem); | |
52 | ||
a38f7907 | 53 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
e6ea64ec | 54 | int match = 0; |
a38f7907 SK |
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 | ||
07a5fa4a SK |
76 | static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg) |
77 | { | |
78 | struct crypto_report_cipher rcipher; | |
79 | ||
9a5467bf | 80 | strncpy(rcipher.type, "cipher", sizeof(rcipher.type)); |
07a5fa4a SK |
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 | ||
6662df33 DM |
86 | if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER, |
87 | sizeof(struct crypto_report_cipher), &rcipher)) | |
88 | goto nla_put_failure; | |
07a5fa4a SK |
89 | return 0; |
90 | ||
91 | nla_put_failure: | |
92 | return -EMSGSIZE; | |
93 | } | |
94 | ||
540b97c1 SK |
95 | static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg) |
96 | { | |
97 | struct crypto_report_comp rcomp; | |
98 | ||
9a5467bf | 99 | strncpy(rcomp.type, "compression", sizeof(rcomp.type)); |
6662df33 DM |
100 | if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, |
101 | sizeof(struct crypto_report_comp), &rcomp)) | |
102 | goto nla_put_failure; | |
540b97c1 SK |
103 | return 0; |
104 | ||
105 | nla_put_failure: | |
106 | return -EMSGSIZE; | |
107 | } | |
108 | ||
a38f7907 SK |
109 | static int crypto_report_one(struct crypto_alg *alg, |
110 | struct crypto_user_alg *ualg, struct sk_buff *skb) | |
111 | { | |
9a5467bf MK |
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; | |
a38f7907 SK |
120 | ualg->cru_flags = alg->cra_flags; |
121 | ualg->cru_refcnt = atomic_read(&alg->cra_refcnt); | |
122 | ||
6662df33 DM |
123 | if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority)) |
124 | goto nla_put_failure; | |
6c5a86f5 SK |
125 | if (alg->cra_flags & CRYPTO_ALG_LARVAL) { |
126 | struct crypto_report_larval rl; | |
127 | ||
9a5467bf | 128 | strncpy(rl.type, "larval", sizeof(rl.type)); |
6662df33 DM |
129 | if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, |
130 | sizeof(struct crypto_report_larval), &rl)) | |
131 | goto nla_put_failure; | |
6c5a86f5 SK |
132 | goto out; |
133 | } | |
134 | ||
b6aa63c0 SK |
135 | if (alg->cra_type && alg->cra_type->report) { |
136 | if (alg->cra_type->report(skb, alg)) | |
137 | goto nla_put_failure; | |
07a5fa4a SK |
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 | ||
540b97c1 SK |
147 | break; |
148 | case CRYPTO_ALG_TYPE_COMPRESS: | |
149 | if (crypto_report_comp(skb, alg)) | |
150 | goto nla_put_failure; | |
151 | ||
07a5fa4a | 152 | break; |
b6aa63c0 SK |
153 | } |
154 | ||
6c5a86f5 | 155 | out: |
a38f7907 SK |
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 | ||
15e47304 | 171 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq, |
a38f7907 SK |
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 | ||
8fd61d34 MK |
201 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
202 | return -EINVAL; | |
203 | ||
e336ed96 | 204 | if (!p->cru_driver_name[0]) |
a38f7907 SK |
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 | ||
15e47304 | 224 | return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid); |
a38f7907 SK |
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 | ||
639b4ac6 | 268 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
c568398a MCO |
269 | return -EPERM; |
270 | ||
8fd61d34 MK |
271 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
272 | return -EINVAL; | |
273 | ||
a38f7907 SK |
274 | if (priority && !strlen(p->cru_driver_name)) |
275 | return -EINVAL; | |
276 | ||
277 | alg = crypto_alg_match(p, 1); | |
278 | if (!alg) | |
279 | return -ENOENT; | |
280 | ||
281 | down_write(&crypto_alg_sem); | |
282 | ||
283 | crypto_remove_spawns(alg, &list, NULL); | |
284 | ||
285 | if (priority) | |
286 | alg->cra_priority = nla_get_u32(priority); | |
287 | ||
288 | up_write(&crypto_alg_sem); | |
289 | ||
290 | crypto_remove_final(&list); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh, | |
296 | struct nlattr **attrs) | |
297 | { | |
298 | struct crypto_alg *alg; | |
299 | struct crypto_user_alg *p = nlmsg_data(nlh); | |
300 | ||
639b4ac6 | 301 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
c568398a MCO |
302 | return -EPERM; |
303 | ||
8fd61d34 MK |
304 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
305 | return -EINVAL; | |
306 | ||
a38f7907 SK |
307 | alg = crypto_alg_match(p, 1); |
308 | if (!alg) | |
309 | return -ENOENT; | |
310 | ||
311 | /* We can not unregister core algorithms such as aes-generic. | |
312 | * We would loose the reference in the crypto_alg_list to this algorithm | |
313 | * if we try to unregister. Unregistering such an algorithm without | |
314 | * removing the module is not possible, so we restrict to crypto | |
315 | * instances that are build from templates. */ | |
316 | if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) | |
317 | return -EINVAL; | |
318 | ||
319 | if (atomic_read(&alg->cra_refcnt) != 1) | |
320 | return -EBUSY; | |
321 | ||
ce3fd840 | 322 | return crypto_unregister_instance(alg); |
a38f7907 SK |
323 | } |
324 | ||
1e122994 SK |
325 | static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type, |
326 | u32 mask) | |
327 | { | |
328 | int err; | |
329 | struct crypto_alg *alg; | |
330 | ||
331 | type = crypto_skcipher_type(type); | |
332 | mask = crypto_skcipher_mask(mask); | |
333 | ||
334 | for (;;) { | |
335 | alg = crypto_lookup_skcipher(name, type, mask); | |
336 | if (!IS_ERR(alg)) | |
337 | return alg; | |
338 | ||
339 | err = PTR_ERR(alg); | |
340 | if (err != -EAGAIN) | |
341 | break; | |
342 | if (signal_pending(current)) { | |
343 | err = -EINTR; | |
344 | break; | |
345 | } | |
346 | } | |
347 | ||
348 | return ERR_PTR(err); | |
349 | } | |
350 | ||
351 | static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type, | |
352 | u32 mask) | |
353 | { | |
354 | int err; | |
355 | struct crypto_alg *alg; | |
356 | ||
357 | type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); | |
358 | type |= CRYPTO_ALG_TYPE_AEAD; | |
359 | mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); | |
360 | mask |= CRYPTO_ALG_TYPE_MASK; | |
361 | ||
362 | for (;;) { | |
363 | alg = crypto_lookup_aead(name, type, mask); | |
364 | if (!IS_ERR(alg)) | |
365 | return alg; | |
366 | ||
367 | err = PTR_ERR(alg); | |
368 | if (err != -EAGAIN) | |
369 | break; | |
370 | if (signal_pending(current)) { | |
371 | err = -EINTR; | |
372 | break; | |
373 | } | |
374 | } | |
375 | ||
376 | return ERR_PTR(err); | |
377 | } | |
378 | ||
a38f7907 SK |
379 | static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
380 | struct nlattr **attrs) | |
381 | { | |
0cfdec7a | 382 | int exact = 0; |
a38f7907 SK |
383 | const char *name; |
384 | struct crypto_alg *alg; | |
385 | struct crypto_user_alg *p = nlmsg_data(nlh); | |
386 | struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; | |
387 | ||
639b4ac6 | 388 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
c568398a MCO |
389 | return -EPERM; |
390 | ||
8fd61d34 MK |
391 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
392 | return -EINVAL; | |
393 | ||
a38f7907 SK |
394 | if (strlen(p->cru_driver_name)) |
395 | exact = 1; | |
396 | ||
397 | if (priority && !exact) | |
398 | return -EINVAL; | |
399 | ||
400 | alg = crypto_alg_match(p, exact); | |
401 | if (alg) | |
402 | return -EEXIST; | |
403 | ||
404 | if (strlen(p->cru_driver_name)) | |
405 | name = p->cru_driver_name; | |
406 | else | |
407 | name = p->cru_name; | |
408 | ||
1e122994 SK |
409 | switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) { |
410 | case CRYPTO_ALG_TYPE_AEAD: | |
411 | alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask); | |
412 | break; | |
413 | case CRYPTO_ALG_TYPE_GIVCIPHER: | |
414 | case CRYPTO_ALG_TYPE_BLKCIPHER: | |
415 | case CRYPTO_ALG_TYPE_ABLKCIPHER: | |
416 | alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask); | |
417 | break; | |
418 | default: | |
419 | alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask); | |
420 | } | |
421 | ||
a38f7907 SK |
422 | if (IS_ERR(alg)) |
423 | return PTR_ERR(alg); | |
424 | ||
425 | down_write(&crypto_alg_sem); | |
426 | ||
427 | if (priority) | |
428 | alg->cra_priority = nla_get_u32(priority); | |
429 | ||
430 | up_write(&crypto_alg_sem); | |
431 | ||
432 | crypto_mod_put(alg); | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | #define MSGSIZE(type) sizeof(struct type) | |
438 | ||
439 | static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = { | |
440 | [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), | |
441 | [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), | |
442 | [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), | |
443 | [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), | |
444 | }; | |
445 | ||
446 | static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = { | |
447 | [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32}, | |
448 | }; | |
449 | ||
450 | #undef MSGSIZE | |
451 | ||
a84fb791 | 452 | static const struct crypto_link { |
a38f7907 SK |
453 | int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
454 | int (*dump)(struct sk_buff *, struct netlink_callback *); | |
455 | int (*done)(struct netlink_callback *); | |
456 | } crypto_dispatch[CRYPTO_NR_MSGTYPES] = { | |
457 | [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg}, | |
458 | [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg}, | |
459 | [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg}, | |
460 | [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report, | |
461 | .dump = crypto_dump_report, | |
462 | .done = crypto_dump_report_done}, | |
463 | }; | |
464 | ||
465 | static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
466 | { | |
467 | struct nlattr *attrs[CRYPTOCFGA_MAX+1]; | |
a84fb791 | 468 | const struct crypto_link *link; |
a38f7907 SK |
469 | int type, err; |
470 | ||
471 | type = nlh->nlmsg_type; | |
472 | if (type > CRYPTO_MSG_MAX) | |
473 | return -EINVAL; | |
474 | ||
475 | type -= CRYPTO_MSG_BASE; | |
476 | link = &crypto_dispatch[type]; | |
477 | ||
a38f7907 SK |
478 | if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) && |
479 | (nlh->nlmsg_flags & NLM_F_DUMP))) { | |
5219a534 SK |
480 | struct crypto_alg *alg; |
481 | u16 dump_alloc = 0; | |
482 | ||
a38f7907 SK |
483 | if (link->dump == NULL) |
484 | return -EINVAL; | |
5219a534 SK |
485 | |
486 | list_for_each_entry(alg, &crypto_alg_list, cra_list) | |
487 | dump_alloc += CRYPTO_REPORT_MAXSIZE; | |
488 | ||
80d326fa PNA |
489 | { |
490 | struct netlink_dump_control c = { | |
491 | .dump = link->dump, | |
492 | .done = link->done, | |
5219a534 | 493 | .min_dump_alloc = dump_alloc, |
80d326fa PNA |
494 | }; |
495 | return netlink_dump_start(crypto_nlsk, skb, nlh, &c); | |
496 | } | |
a38f7907 SK |
497 | } |
498 | ||
499 | err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX, | |
500 | crypto_policy); | |
501 | if (err < 0) | |
502 | return err; | |
503 | ||
504 | if (link->doit == NULL) | |
505 | return -EINVAL; | |
506 | ||
507 | return link->doit(skb, nlh, attrs); | |
508 | } | |
509 | ||
510 | static void crypto_netlink_rcv(struct sk_buff *skb) | |
511 | { | |
512 | mutex_lock(&crypto_cfg_mutex); | |
513 | netlink_rcv_skb(skb, &crypto_user_rcv_msg); | |
514 | mutex_unlock(&crypto_cfg_mutex); | |
515 | } | |
516 | ||
517 | static int __init crypto_user_init(void) | |
518 | { | |
a31f2d17 PNA |
519 | struct netlink_kernel_cfg cfg = { |
520 | .input = crypto_netlink_rcv, | |
521 | }; | |
522 | ||
9f00d977 | 523 | crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg); |
a38f7907 SK |
524 | if (!crypto_nlsk) |
525 | return -ENOMEM; | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static void __exit crypto_user_exit(void) | |
531 | { | |
532 | netlink_kernel_release(crypto_nlsk); | |
533 | } | |
534 | ||
535 | module_init(crypto_user_init); | |
536 | module_exit(crypto_user_exit); | |
537 | MODULE_LICENSE("GPL"); | |
538 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
539 | MODULE_DESCRIPTION("Crypto userspace configuration API"); |