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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
35static DEFINE_MUTEX(crypto_cfg_mutex);
36
37
38static struct sock *crypto_nlsk;
39
40struct 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
47static 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 continue;
67
68 if (unlikely(!crypto_mod_get(q)))
69 continue;
70
71 alg = q;
72 break;
73 }
74
75 up_read(&crypto_alg_sem);
76
77 return alg;
78}
79
80static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
81{
82 struct crypto_report_cipher rcipher;
83
84 strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
85
86 rcipher.blocksize = alg->cra_blocksize;
87 rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
88 rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
89
90 if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
91 sizeof(struct crypto_report_cipher), &rcipher))
92 goto nla_put_failure;
93 return 0;
94
95nla_put_failure:
96 return -EMSGSIZE;
97}
98
99static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
100{
101 struct crypto_report_comp rcomp;
102
103 strncpy(rcomp.type, "compression", sizeof(rcomp.type));
104 if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
105 sizeof(struct crypto_report_comp), &rcomp))
106 goto nla_put_failure;
107 return 0;
108
109nla_put_failure:
110 return -EMSGSIZE;
111}
112
113static int crypto_report_one(struct crypto_alg *alg,
114 struct crypto_user_alg *ualg, struct sk_buff *skb)
115{
116 strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
117 strncpy(ualg->cru_driver_name, alg->cra_driver_name,
118 sizeof(ualg->cru_driver_name));
119 strncpy(ualg->cru_module_name, module_name(alg->cra_module),
120 sizeof(ualg->cru_module_name));
121
122 ualg->cru_type = 0;
123 ualg->cru_mask = 0;
124 ualg->cru_flags = alg->cra_flags;
125 ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
126
127 if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
128 goto nla_put_failure;
129 if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
130 struct crypto_report_larval rl;
131
132 strncpy(rl.type, "larval", sizeof(rl.type));
133 if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
134 sizeof(struct crypto_report_larval), &rl))
135 goto nla_put_failure;
136 goto out;
137 }
138
139 if (alg->cra_type && alg->cra_type->report) {
140 if (alg->cra_type->report(skb, alg))
141 goto nla_put_failure;
142
143 goto out;
144 }
145
146 switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
147 case CRYPTO_ALG_TYPE_CIPHER:
148 if (crypto_report_cipher(skb, alg))
149 goto nla_put_failure;
150
151 break;
152 case CRYPTO_ALG_TYPE_COMPRESS:
153 if (crypto_report_comp(skb, alg))
154 goto nla_put_failure;
155
156 break;
157 }
158
159out:
160 return 0;
161
162nla_put_failure:
163 return -EMSGSIZE;
164}
165
166static int crypto_report_alg(struct crypto_alg *alg,
167 struct crypto_dump_info *info)
168{
169 struct sk_buff *in_skb = info->in_skb;
170 struct sk_buff *skb = info->out_skb;
171 struct nlmsghdr *nlh;
172 struct crypto_user_alg *ualg;
173 int err = 0;
174
175 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
176 CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
177 if (!nlh) {
178 err = -EMSGSIZE;
179 goto out;
180 }
181
182 ualg = nlmsg_data(nlh);
183
184 err = crypto_report_one(alg, ualg, skb);
185 if (err) {
186 nlmsg_cancel(skb, nlh);
187 goto out;
188 }
189
190 nlmsg_end(skb, nlh);
191
192out:
193 return err;
194}
195
196static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
197 struct nlattr **attrs)
198{
199 struct crypto_user_alg *p = nlmsg_data(in_nlh);
200 struct crypto_alg *alg;
201 struct sk_buff *skb;
202 struct crypto_dump_info info;
203 int err;
204
205 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
206 return -EINVAL;
207
208 alg = crypto_alg_match(p, 0);
209 if (!alg)
210 return -ENOENT;
211
212 err = -ENOMEM;
213 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
214 if (!skb)
215 goto drop_alg;
216
217 info.in_skb = in_skb;
218 info.out_skb = skb;
219 info.nlmsg_seq = in_nlh->nlmsg_seq;
220 info.nlmsg_flags = 0;
221
222 err = crypto_report_alg(alg, &info);
223
224drop_alg:
225 crypto_mod_put(alg);
226
227 if (err)
228 return err;
229
230 return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
231}
232
233static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
234{
235 struct crypto_alg *alg;
236 struct crypto_dump_info info;
237 int err;
238
239 if (cb->args[0])
240 goto out;
241
242 cb->args[0] = 1;
243
244 info.in_skb = cb->skb;
245 info.out_skb = skb;
246 info.nlmsg_seq = cb->nlh->nlmsg_seq;
247 info.nlmsg_flags = NLM_F_MULTI;
248
249 list_for_each_entry(alg, &crypto_alg_list, cra_list) {
250 err = crypto_report_alg(alg, &info);
251 if (err)
252 goto out_err;
253 }
254
255out:
256 return skb->len;
257out_err:
258 return err;
259}
260
261static int crypto_dump_report_done(struct netlink_callback *cb)
262{
263 return 0;
264}
265
266static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
267 struct nlattr **attrs)
268{
269 struct crypto_alg *alg;
270 struct crypto_user_alg *p = nlmsg_data(nlh);
271 struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
272 LIST_HEAD(list);
273
274 if (!netlink_capable(skb, CAP_NET_ADMIN))
275 return -EPERM;
276
277 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
278 return -EINVAL;
279
280 if (priority && !strlen(p->cru_driver_name))
281 return -EINVAL;
282
283 alg = crypto_alg_match(p, 1);
284 if (!alg)
285 return -ENOENT;
286
287 down_write(&crypto_alg_sem);
288
289 crypto_remove_spawns(alg, &list, NULL);
290
291 if (priority)
292 alg->cra_priority = nla_get_u32(priority);
293
294 up_write(&crypto_alg_sem);
295
296 crypto_mod_put(alg);
297 crypto_remove_final(&list);
298
299 return 0;
300}
301
302static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
303 struct nlattr **attrs)
304{
305 struct crypto_alg *alg;
306 struct crypto_user_alg *p = nlmsg_data(nlh);
307 int err;
308
309 if (!netlink_capable(skb, CAP_NET_ADMIN))
310 return -EPERM;
311
312 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
313 return -EINVAL;
314
315 alg = crypto_alg_match(p, 1);
316 if (!alg)
317 return -ENOENT;
318
319
320
321
322
323
324 err = -EINVAL;
325 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
326 goto drop_alg;
327
328 err = -EBUSY;
329 if (atomic_read(&alg->cra_refcnt) > 2)
330 goto drop_alg;
331
332 err = crypto_unregister_instance((struct crypto_instance *)alg);
333
334drop_alg:
335 crypto_mod_put(alg);
336 return err;
337}
338
339static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type,
340 u32 mask)
341{
342 int err;
343 struct crypto_alg *alg;
344
345 type = crypto_skcipher_type(type);
346 mask = crypto_skcipher_mask(mask);
347
348 for (;;) {
349 alg = crypto_lookup_skcipher(name, type, mask);
350 if (!IS_ERR(alg))
351 return alg;
352
353 err = PTR_ERR(alg);
354 if (err != -EAGAIN)
355 break;
356 if (signal_pending(current)) {
357 err = -EINTR;
358 break;
359 }
360 }
361
362 return ERR_PTR(err);
363}
364
365static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type,
366 u32 mask)
367{
368 int err;
369 struct crypto_alg *alg;
370
371 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
372 type |= CRYPTO_ALG_TYPE_AEAD;
373 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
374 mask |= CRYPTO_ALG_TYPE_MASK;
375
376 for (;;) {
377 alg = crypto_lookup_aead(name, type, mask);
378 if (!IS_ERR(alg))
379 return alg;
380
381 err = PTR_ERR(alg);
382 if (err != -EAGAIN)
383 break;
384 if (signal_pending(current)) {
385 err = -EINTR;
386 break;
387 }
388 }
389
390 return ERR_PTR(err);
391}
392
393static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
394 struct nlattr **attrs)
395{
396 int exact = 0;
397 const char *name;
398 struct crypto_alg *alg;
399 struct crypto_user_alg *p = nlmsg_data(nlh);
400 struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
401
402 if (!netlink_capable(skb, CAP_NET_ADMIN))
403 return -EPERM;
404
405 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
406 return -EINVAL;
407
408 if (strlen(p->cru_driver_name))
409 exact = 1;
410
411 if (priority && !exact)
412 return -EINVAL;
413
414 alg = crypto_alg_match(p, exact);
415 if (alg) {
416 crypto_mod_put(alg);
417 return -EEXIST;
418 }
419
420 if (strlen(p->cru_driver_name))
421 name = p->cru_driver_name;
422 else
423 name = p->cru_name;
424
425 switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) {
426 case CRYPTO_ALG_TYPE_AEAD:
427 alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask);
428 break;
429 case CRYPTO_ALG_TYPE_GIVCIPHER:
430 case CRYPTO_ALG_TYPE_BLKCIPHER:
431 case CRYPTO_ALG_TYPE_ABLKCIPHER:
432 alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask);
433 break;
434 default:
435 alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
436 }
437
438 if (IS_ERR(alg))
439 return PTR_ERR(alg);
440
441 down_write(&crypto_alg_sem);
442
443 if (priority)
444 alg->cra_priority = nla_get_u32(priority);
445
446 up_write(&crypto_alg_sem);
447
448 crypto_mod_put(alg);
449
450 return 0;
451}
452
453#define MSGSIZE(type) sizeof(struct type)
454
455static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
456 [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
457 [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
458 [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
459 [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
460};
461
462static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
463 [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
464};
465
466#undef MSGSIZE
467
468static const struct crypto_link {
469 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
470 int (*dump)(struct sk_buff *, struct netlink_callback *);
471 int (*done)(struct netlink_callback *);
472} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
473 [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
474 [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
475 [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
476 [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
477 .dump = crypto_dump_report,
478 .done = crypto_dump_report_done},
479};
480
481static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
482{
483 struct nlattr *attrs[CRYPTOCFGA_MAX+1];
484 const struct crypto_link *link;
485 int type, err;
486
487 type = nlh->nlmsg_type;
488 if (type > CRYPTO_MSG_MAX)
489 return -EINVAL;
490
491 type -= CRYPTO_MSG_BASE;
492 link = &crypto_dispatch[type];
493
494 if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
495 (nlh->nlmsg_flags & NLM_F_DUMP))) {
496 struct crypto_alg *alg;
497 u16 dump_alloc = 0;
498
499 if (link->dump == NULL)
500 return -EINVAL;
501
502 list_for_each_entry(alg, &crypto_alg_list, cra_list)
503 dump_alloc += CRYPTO_REPORT_MAXSIZE;
504
505 {
506 struct netlink_dump_control c = {
507 .dump = link->dump,
508 .done = link->done,
509 .min_dump_alloc = dump_alloc,
510 };
511 return netlink_dump_start(crypto_nlsk, skb, nlh, &c);
512 }
513 }
514
515 err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
516 crypto_policy);
517 if (err < 0)
518 return err;
519
520 if (link->doit == NULL)
521 return -EINVAL;
522
523 return link->doit(skb, nlh, attrs);
524}
525
526static void crypto_netlink_rcv(struct sk_buff *skb)
527{
528 mutex_lock(&crypto_cfg_mutex);
529 netlink_rcv_skb(skb, &crypto_user_rcv_msg);
530 mutex_unlock(&crypto_cfg_mutex);
531}
532
533static int __init crypto_user_init(void)
534{
535 struct netlink_kernel_cfg cfg = {
536 .input = crypto_netlink_rcv,
537 };
538
539 crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
540 if (!crypto_nlsk)
541 return -ENOMEM;
542
543 return 0;
544}
545
546static void __exit crypto_user_exit(void)
547{
548 netlink_kernel_release(crypto_nlsk);
549}
550
551module_init(crypto_user_init);
552module_exit(crypto_user_exit);
553MODULE_LICENSE("GPL");
554MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
555MODULE_DESCRIPTION("Crypto userspace configuration API");
556MODULE_ALIAS("net-pf-16-proto-21");
557
