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17926a79 DH |
1 | /* Kerberos-based RxRPC security |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/net.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/udp.h> | |
16 | #include <linux/crypto.h> | |
17 | #include <linux/scatterlist.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <net/sock.h> | |
20 | #include <net/af_rxrpc.h> | |
b1bdb691 | 21 | #define rxrpc_debug rxkad_debug |
17926a79 DH |
22 | #include "ar-internal.h" |
23 | ||
24 | #define RXKAD_VERSION 2 | |
25 | #define MAXKRB5TICKETLEN 1024 | |
26 | #define RXKAD_TKT_TYPE_KERBEROS_V5 256 | |
27 | #define ANAME_SZ 40 /* size of authentication name */ | |
28 | #define INST_SZ 40 /* size of principal's instance */ | |
29 | #define REALM_SZ 40 /* size of principal's auth domain */ | |
30 | #define SNAME_SZ 40 /* size of service name */ | |
31 | ||
32 | unsigned rxrpc_debug; | |
33 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); | |
34 | MODULE_PARM_DESC(rxrpc_debug, "rxkad debugging mask"); | |
35 | ||
36 | struct rxkad_level1_hdr { | |
37 | __be32 data_size; /* true data size (excluding padding) */ | |
38 | }; | |
39 | ||
40 | struct rxkad_level2_hdr { | |
41 | __be32 data_size; /* true data size (excluding padding) */ | |
42 | __be32 checksum; /* decrypted data checksum */ | |
43 | }; | |
44 | ||
45 | MODULE_DESCRIPTION("RxRPC network protocol type-2 security (Kerberos)"); | |
46 | MODULE_AUTHOR("Red Hat, Inc."); | |
47 | MODULE_LICENSE("GPL"); | |
48 | ||
49 | /* | |
50 | * this holds a pinned cipher so that keventd doesn't get called by the cipher | |
51 | * alloc routine, but since we have it to hand, we use it to decrypt RESPONSE | |
52 | * packets | |
53 | */ | |
54 | static struct crypto_blkcipher *rxkad_ci; | |
55 | static DEFINE_MUTEX(rxkad_ci_mutex); | |
56 | ||
57 | /* | |
58 | * initialise connection security | |
59 | */ | |
60 | static int rxkad_init_connection_security(struct rxrpc_connection *conn) | |
61 | { | |
62 | struct rxrpc_key_payload *payload; | |
63 | struct crypto_blkcipher *ci; | |
64 | int ret; | |
65 | ||
66 | _enter("{%d},{%x}", conn->debug_id, key_serial(conn->key)); | |
67 | ||
68 | payload = conn->key->payload.data; | |
69 | conn->security_ix = payload->k.security_index; | |
70 | ||
71 | ci = crypto_alloc_blkcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC); | |
72 | if (IS_ERR(ci)) { | |
73 | _debug("no cipher"); | |
74 | ret = PTR_ERR(ci); | |
75 | goto error; | |
76 | } | |
77 | ||
78 | if (crypto_blkcipher_setkey(ci, payload->k.session_key, | |
79 | sizeof(payload->k.session_key)) < 0) | |
80 | BUG(); | |
81 | ||
82 | switch (conn->security_level) { | |
83 | case RXRPC_SECURITY_PLAIN: | |
84 | break; | |
85 | case RXRPC_SECURITY_AUTH: | |
86 | conn->size_align = 8; | |
87 | conn->security_size = sizeof(struct rxkad_level1_hdr); | |
88 | conn->header_size += sizeof(struct rxkad_level1_hdr); | |
89 | break; | |
90 | case RXRPC_SECURITY_ENCRYPT: | |
91 | conn->size_align = 8; | |
92 | conn->security_size = sizeof(struct rxkad_level2_hdr); | |
93 | conn->header_size += sizeof(struct rxkad_level2_hdr); | |
94 | break; | |
95 | default: | |
96 | ret = -EKEYREJECTED; | |
97 | goto error; | |
98 | } | |
99 | ||
100 | conn->cipher = ci; | |
101 | ret = 0; | |
102 | error: | |
103 | _leave(" = %d", ret); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | /* | |
108 | * prime the encryption state with the invariant parts of a connection's | |
109 | * description | |
110 | */ | |
111 | static void rxkad_prime_packet_security(struct rxrpc_connection *conn) | |
112 | { | |
113 | struct rxrpc_key_payload *payload; | |
114 | struct blkcipher_desc desc; | |
115 | struct scatterlist sg[2]; | |
116 | struct rxrpc_crypt iv; | |
117 | struct { | |
118 | __be32 x[4]; | |
119 | } tmpbuf __attribute__((aligned(16))); /* must all be in same page */ | |
120 | ||
121 | _enter(""); | |
122 | ||
123 | if (!conn->key) | |
124 | return; | |
125 | ||
126 | payload = conn->key->payload.data; | |
127 | memcpy(&iv, payload->k.session_key, sizeof(iv)); | |
128 | ||
129 | desc.tfm = conn->cipher; | |
130 | desc.info = iv.x; | |
131 | desc.flags = 0; | |
132 | ||
133 | tmpbuf.x[0] = conn->epoch; | |
134 | tmpbuf.x[1] = conn->cid; | |
135 | tmpbuf.x[2] = 0; | |
136 | tmpbuf.x[3] = htonl(conn->security_ix); | |
137 | ||
138 | memset(sg, 0, sizeof(sg)); | |
139 | sg_set_buf(&sg[0], &tmpbuf, sizeof(tmpbuf)); | |
140 | sg_set_buf(&sg[1], &tmpbuf, sizeof(tmpbuf)); | |
141 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf)); | |
142 | ||
143 | memcpy(&conn->csum_iv, &tmpbuf.x[2], sizeof(conn->csum_iv)); | |
144 | ASSERTCMP(conn->csum_iv.n[0], ==, tmpbuf.x[2]); | |
145 | ||
146 | _leave(""); | |
147 | } | |
148 | ||
149 | /* | |
150 | * partially encrypt a packet (level 1 security) | |
151 | */ | |
152 | static int rxkad_secure_packet_auth(const struct rxrpc_call *call, | |
153 | struct sk_buff *skb, | |
154 | u32 data_size, | |
155 | void *sechdr) | |
156 | { | |
157 | struct rxrpc_skb_priv *sp; | |
158 | struct blkcipher_desc desc; | |
159 | struct rxrpc_crypt iv; | |
160 | struct scatterlist sg[2]; | |
161 | struct { | |
162 | struct rxkad_level1_hdr hdr; | |
163 | __be32 first; /* first four bytes of data and padding */ | |
164 | } tmpbuf __attribute__((aligned(8))); /* must all be in same page */ | |
165 | u16 check; | |
166 | ||
167 | sp = rxrpc_skb(skb); | |
168 | ||
169 | _enter(""); | |
170 | ||
171 | check = ntohl(sp->hdr.seq ^ sp->hdr.callNumber); | |
172 | data_size |= (u32) check << 16; | |
173 | ||
174 | tmpbuf.hdr.data_size = htonl(data_size); | |
175 | memcpy(&tmpbuf.first, sechdr + 4, sizeof(tmpbuf.first)); | |
176 | ||
177 | /* start the encryption afresh */ | |
178 | memset(&iv, 0, sizeof(iv)); | |
179 | desc.tfm = call->conn->cipher; | |
180 | desc.info = iv.x; | |
181 | desc.flags = 0; | |
182 | ||
183 | memset(sg, 0, sizeof(sg)); | |
184 | sg_set_buf(&sg[0], &tmpbuf, sizeof(tmpbuf)); | |
185 | sg_set_buf(&sg[1], &tmpbuf, sizeof(tmpbuf)); | |
186 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf)); | |
187 | ||
188 | memcpy(sechdr, &tmpbuf, sizeof(tmpbuf)); | |
189 | ||
190 | _leave(" = 0"); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | /* | |
195 | * wholly encrypt a packet (level 2 security) | |
196 | */ | |
197 | static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call, | |
198 | struct sk_buff *skb, | |
199 | u32 data_size, | |
200 | void *sechdr) | |
201 | { | |
202 | const struct rxrpc_key_payload *payload; | |
203 | struct rxkad_level2_hdr rxkhdr | |
204 | __attribute__((aligned(8))); /* must be all on one page */ | |
205 | struct rxrpc_skb_priv *sp; | |
206 | struct blkcipher_desc desc; | |
207 | struct rxrpc_crypt iv; | |
208 | struct scatterlist sg[16]; | |
209 | struct sk_buff *trailer; | |
210 | unsigned len; | |
211 | u16 check; | |
212 | int nsg; | |
213 | ||
214 | sp = rxrpc_skb(skb); | |
215 | ||
216 | _enter(""); | |
217 | ||
218 | check = ntohl(sp->hdr.seq ^ sp->hdr.callNumber); | |
219 | ||
220 | rxkhdr.data_size = htonl(data_size | (u32) check << 16); | |
221 | rxkhdr.checksum = 0; | |
222 | ||
223 | /* encrypt from the session key */ | |
224 | payload = call->conn->key->payload.data; | |
225 | memcpy(&iv, payload->k.session_key, sizeof(iv)); | |
226 | desc.tfm = call->conn->cipher; | |
227 | desc.info = iv.x; | |
228 | desc.flags = 0; | |
229 | ||
230 | memset(sg, 0, sizeof(sg[0]) * 2); | |
231 | sg_set_buf(&sg[0], sechdr, sizeof(rxkhdr)); | |
232 | sg_set_buf(&sg[1], &rxkhdr, sizeof(rxkhdr)); | |
233 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(rxkhdr)); | |
234 | ||
235 | /* we want to encrypt the skbuff in-place */ | |
236 | nsg = skb_cow_data(skb, 0, &trailer); | |
237 | if (nsg < 0 || nsg > 16) | |
238 | return -ENOMEM; | |
239 | ||
240 | len = data_size + call->conn->size_align - 1; | |
241 | len &= ~(call->conn->size_align - 1); | |
242 | ||
243 | skb_to_sgvec(skb, sg, 0, len); | |
244 | crypto_blkcipher_encrypt_iv(&desc, sg, sg, len); | |
245 | ||
246 | _leave(" = 0"); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | /* | |
251 | * checksum an RxRPC packet header | |
252 | */ | |
253 | static int rxkad_secure_packet(const struct rxrpc_call *call, | |
254 | struct sk_buff *skb, | |
255 | size_t data_size, | |
256 | void *sechdr) | |
257 | { | |
258 | struct rxrpc_skb_priv *sp; | |
259 | struct blkcipher_desc desc; | |
260 | struct rxrpc_crypt iv; | |
261 | struct scatterlist sg[2]; | |
262 | struct { | |
263 | __be32 x[2]; | |
264 | } tmpbuf __attribute__((aligned(8))); /* must all be in same page */ | |
265 | __be32 x; | |
266 | int ret; | |
267 | ||
268 | sp = rxrpc_skb(skb); | |
269 | ||
270 | _enter("{%d{%x}},{#%u},%zu,", | |
271 | call->debug_id, key_serial(call->conn->key), ntohl(sp->hdr.seq), | |
272 | data_size); | |
273 | ||
274 | if (!call->conn->cipher) | |
275 | return 0; | |
276 | ||
277 | ret = key_validate(call->conn->key); | |
278 | if (ret < 0) | |
279 | return ret; | |
280 | ||
281 | /* continue encrypting from where we left off */ | |
282 | memcpy(&iv, call->conn->csum_iv.x, sizeof(iv)); | |
283 | desc.tfm = call->conn->cipher; | |
284 | desc.info = iv.x; | |
285 | desc.flags = 0; | |
286 | ||
287 | /* calculate the security checksum */ | |
288 | x = htonl(call->channel << (32 - RXRPC_CIDSHIFT)); | |
289 | x |= sp->hdr.seq & __constant_cpu_to_be32(0x3fffffff); | |
290 | tmpbuf.x[0] = sp->hdr.callNumber; | |
291 | tmpbuf.x[1] = x; | |
292 | ||
293 | memset(&sg, 0, sizeof(sg)); | |
294 | sg_set_buf(&sg[0], &tmpbuf, sizeof(tmpbuf)); | |
295 | sg_set_buf(&sg[1], &tmpbuf, sizeof(tmpbuf)); | |
296 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf)); | |
297 | ||
298 | x = ntohl(tmpbuf.x[1]); | |
299 | x = (x >> 16) & 0xffff; | |
300 | if (x == 0) | |
301 | x = 1; /* zero checksums are not permitted */ | |
302 | sp->hdr.cksum = htons(x); | |
303 | ||
304 | switch (call->conn->security_level) { | |
305 | case RXRPC_SECURITY_PLAIN: | |
306 | ret = 0; | |
307 | break; | |
308 | case RXRPC_SECURITY_AUTH: | |
309 | ret = rxkad_secure_packet_auth(call, skb, data_size, sechdr); | |
310 | break; | |
311 | case RXRPC_SECURITY_ENCRYPT: | |
312 | ret = rxkad_secure_packet_encrypt(call, skb, data_size, | |
313 | sechdr); | |
314 | break; | |
315 | default: | |
316 | ret = -EPERM; | |
317 | break; | |
318 | } | |
319 | ||
320 | _leave(" = %d [set %hx]", ret, x); | |
321 | return ret; | |
322 | } | |
323 | ||
324 | /* | |
325 | * decrypt partial encryption on a packet (level 1 security) | |
326 | */ | |
327 | static int rxkad_verify_packet_auth(const struct rxrpc_call *call, | |
328 | struct sk_buff *skb, | |
329 | u32 *_abort_code) | |
330 | { | |
331 | struct rxkad_level1_hdr sechdr; | |
332 | struct rxrpc_skb_priv *sp; | |
333 | struct blkcipher_desc desc; | |
334 | struct rxrpc_crypt iv; | |
335 | struct scatterlist sg[2]; | |
336 | struct sk_buff *trailer; | |
337 | u32 data_size, buf; | |
338 | u16 check; | |
339 | ||
340 | _enter(""); | |
341 | ||
342 | sp = rxrpc_skb(skb); | |
343 | ||
344 | /* we want to decrypt the skbuff in-place */ | |
345 | if (skb_cow_data(skb, 0, &trailer) < 0) | |
346 | goto nomem; | |
347 | ||
348 | skb_to_sgvec(skb, sg, 0, 8); | |
349 | ||
350 | /* start the decryption afresh */ | |
351 | memset(&iv, 0, sizeof(iv)); | |
352 | desc.tfm = call->conn->cipher; | |
353 | desc.info = iv.x; | |
354 | desc.flags = 0; | |
355 | ||
356 | crypto_blkcipher_decrypt_iv(&desc, sg, sg, 8); | |
357 | ||
358 | /* remove the decrypted packet length */ | |
359 | if (skb_copy_bits(skb, 0, &sechdr, sizeof(sechdr)) < 0) | |
360 | goto datalen_error; | |
361 | if (!skb_pull(skb, sizeof(sechdr))) | |
362 | BUG(); | |
363 | ||
364 | buf = ntohl(sechdr.data_size); | |
365 | data_size = buf & 0xffff; | |
366 | ||
367 | check = buf >> 16; | |
368 | check ^= ntohl(sp->hdr.seq ^ sp->hdr.callNumber); | |
369 | check &= 0xffff; | |
370 | if (check != 0) { | |
371 | *_abort_code = RXKADSEALEDINCON; | |
372 | goto protocol_error; | |
373 | } | |
374 | ||
375 | /* shorten the packet to remove the padding */ | |
376 | if (data_size > skb->len) | |
377 | goto datalen_error; | |
378 | else if (data_size < skb->len) | |
379 | skb->len = data_size; | |
380 | ||
381 | _leave(" = 0 [dlen=%x]", data_size); | |
382 | return 0; | |
383 | ||
384 | datalen_error: | |
385 | *_abort_code = RXKADDATALEN; | |
386 | protocol_error: | |
387 | _leave(" = -EPROTO"); | |
388 | return -EPROTO; | |
389 | ||
390 | nomem: | |
391 | _leave(" = -ENOMEM"); | |
392 | return -ENOMEM; | |
393 | } | |
394 | ||
395 | /* | |
396 | * wholly decrypt a packet (level 2 security) | |
397 | */ | |
398 | static int rxkad_verify_packet_encrypt(const struct rxrpc_call *call, | |
399 | struct sk_buff *skb, | |
400 | u32 *_abort_code) | |
401 | { | |
402 | const struct rxrpc_key_payload *payload; | |
403 | struct rxkad_level2_hdr sechdr; | |
404 | struct rxrpc_skb_priv *sp; | |
405 | struct blkcipher_desc desc; | |
406 | struct rxrpc_crypt iv; | |
407 | struct scatterlist _sg[4], *sg; | |
408 | struct sk_buff *trailer; | |
409 | u32 data_size, buf; | |
410 | u16 check; | |
411 | int nsg; | |
412 | ||
413 | _enter(",{%d}", skb->len); | |
414 | ||
415 | sp = rxrpc_skb(skb); | |
416 | ||
417 | /* we want to decrypt the skbuff in-place */ | |
418 | nsg = skb_cow_data(skb, 0, &trailer); | |
419 | if (nsg < 0) | |
420 | goto nomem; | |
421 | ||
422 | sg = _sg; | |
423 | if (unlikely(nsg > 4)) { | |
424 | sg = kmalloc(sizeof(*sg) * nsg, GFP_NOIO); | |
425 | if (!sg) | |
426 | goto nomem; | |
427 | } | |
428 | ||
429 | skb_to_sgvec(skb, sg, 0, skb->len); | |
430 | ||
431 | /* decrypt from the session key */ | |
432 | payload = call->conn->key->payload.data; | |
433 | memcpy(&iv, payload->k.session_key, sizeof(iv)); | |
434 | desc.tfm = call->conn->cipher; | |
435 | desc.info = iv.x; | |
436 | desc.flags = 0; | |
437 | ||
438 | crypto_blkcipher_decrypt_iv(&desc, sg, sg, skb->len); | |
439 | if (sg != _sg) | |
440 | kfree(sg); | |
441 | ||
442 | /* remove the decrypted packet length */ | |
443 | if (skb_copy_bits(skb, 0, &sechdr, sizeof(sechdr)) < 0) | |
444 | goto datalen_error; | |
445 | if (!skb_pull(skb, sizeof(sechdr))) | |
446 | BUG(); | |
447 | ||
448 | buf = ntohl(sechdr.data_size); | |
449 | data_size = buf & 0xffff; | |
450 | ||
451 | check = buf >> 16; | |
452 | check ^= ntohl(sp->hdr.seq ^ sp->hdr.callNumber); | |
453 | check &= 0xffff; | |
454 | if (check != 0) { | |
455 | *_abort_code = RXKADSEALEDINCON; | |
456 | goto protocol_error; | |
457 | } | |
458 | ||
459 | /* shorten the packet to remove the padding */ | |
460 | if (data_size > skb->len) | |
461 | goto datalen_error; | |
462 | else if (data_size < skb->len) | |
463 | skb->len = data_size; | |
464 | ||
465 | _leave(" = 0 [dlen=%x]", data_size); | |
466 | return 0; | |
467 | ||
468 | datalen_error: | |
469 | *_abort_code = RXKADDATALEN; | |
470 | protocol_error: | |
471 | _leave(" = -EPROTO"); | |
472 | return -EPROTO; | |
473 | ||
474 | nomem: | |
475 | _leave(" = -ENOMEM"); | |
476 | return -ENOMEM; | |
477 | } | |
478 | ||
479 | /* | |
480 | * verify the security on a received packet | |
481 | */ | |
482 | static int rxkad_verify_packet(const struct rxrpc_call *call, | |
483 | struct sk_buff *skb, | |
484 | u32 *_abort_code) | |
485 | { | |
486 | struct blkcipher_desc desc; | |
487 | struct rxrpc_skb_priv *sp; | |
488 | struct rxrpc_crypt iv; | |
489 | struct scatterlist sg[2]; | |
490 | struct { | |
491 | __be32 x[2]; | |
492 | } tmpbuf __attribute__((aligned(8))); /* must all be in same page */ | |
493 | __be32 x; | |
494 | __be16 cksum; | |
495 | int ret; | |
496 | ||
497 | sp = rxrpc_skb(skb); | |
498 | ||
499 | _enter("{%d{%x}},{#%u}", | |
500 | call->debug_id, key_serial(call->conn->key), | |
501 | ntohl(sp->hdr.seq)); | |
502 | ||
503 | if (!call->conn->cipher) | |
504 | return 0; | |
505 | ||
506 | if (sp->hdr.securityIndex != 2) { | |
507 | *_abort_code = RXKADINCONSISTENCY; | |
508 | _leave(" = -EPROTO [not rxkad]"); | |
509 | return -EPROTO; | |
510 | } | |
511 | ||
512 | /* continue encrypting from where we left off */ | |
513 | memcpy(&iv, call->conn->csum_iv.x, sizeof(iv)); | |
514 | desc.tfm = call->conn->cipher; | |
515 | desc.info = iv.x; | |
516 | desc.flags = 0; | |
517 | ||
518 | /* validate the security checksum */ | |
519 | x = htonl(call->channel << (32 - RXRPC_CIDSHIFT)); | |
520 | x |= sp->hdr.seq & __constant_cpu_to_be32(0x3fffffff); | |
521 | tmpbuf.x[0] = call->call_id; | |
522 | tmpbuf.x[1] = x; | |
523 | ||
524 | memset(&sg, 0, sizeof(sg)); | |
525 | sg_set_buf(&sg[0], &tmpbuf, sizeof(tmpbuf)); | |
526 | sg_set_buf(&sg[1], &tmpbuf, sizeof(tmpbuf)); | |
527 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf)); | |
528 | ||
529 | x = ntohl(tmpbuf.x[1]); | |
530 | x = (x >> 16) & 0xffff; | |
531 | if (x == 0) | |
532 | x = 1; /* zero checksums are not permitted */ | |
533 | ||
534 | cksum = htons(x); | |
535 | if (sp->hdr.cksum != cksum) { | |
536 | *_abort_code = RXKADSEALEDINCON; | |
537 | _leave(" = -EPROTO [csum failed]"); | |
538 | return -EPROTO; | |
539 | } | |
540 | ||
541 | switch (call->conn->security_level) { | |
542 | case RXRPC_SECURITY_PLAIN: | |
543 | ret = 0; | |
544 | break; | |
545 | case RXRPC_SECURITY_AUTH: | |
546 | ret = rxkad_verify_packet_auth(call, skb, _abort_code); | |
547 | break; | |
548 | case RXRPC_SECURITY_ENCRYPT: | |
549 | ret = rxkad_verify_packet_encrypt(call, skb, _abort_code); | |
550 | break; | |
551 | default: | |
552 | ret = -ENOANO; | |
553 | break; | |
554 | } | |
555 | ||
556 | _leave(" = %d", ret); | |
557 | return ret; | |
558 | } | |
559 | ||
560 | /* | |
561 | * issue a challenge | |
562 | */ | |
563 | static int rxkad_issue_challenge(struct rxrpc_connection *conn) | |
564 | { | |
565 | struct rxkad_challenge challenge; | |
566 | struct rxrpc_header hdr; | |
567 | struct msghdr msg; | |
568 | struct kvec iov[2]; | |
569 | size_t len; | |
570 | int ret; | |
571 | ||
572 | _enter("{%d,%x}", conn->debug_id, key_serial(conn->key)); | |
573 | ||
574 | ret = key_validate(conn->key); | |
575 | if (ret < 0) | |
576 | return ret; | |
577 | ||
578 | get_random_bytes(&conn->security_nonce, sizeof(conn->security_nonce)); | |
579 | ||
580 | challenge.version = htonl(2); | |
581 | challenge.nonce = htonl(conn->security_nonce); | |
582 | challenge.min_level = htonl(0); | |
583 | challenge.__padding = 0; | |
584 | ||
585 | msg.msg_name = &conn->trans->peer->srx.transport.sin; | |
586 | msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin); | |
587 | msg.msg_control = NULL; | |
588 | msg.msg_controllen = 0; | |
589 | msg.msg_flags = 0; | |
590 | ||
591 | hdr.epoch = conn->epoch; | |
592 | hdr.cid = conn->cid; | |
593 | hdr.callNumber = 0; | |
594 | hdr.seq = 0; | |
595 | hdr.type = RXRPC_PACKET_TYPE_CHALLENGE; | |
596 | hdr.flags = conn->out_clientflag; | |
597 | hdr.userStatus = 0; | |
598 | hdr.securityIndex = conn->security_ix; | |
599 | hdr._rsvd = 0; | |
600 | hdr.serviceId = conn->service_id; | |
601 | ||
602 | iov[0].iov_base = &hdr; | |
603 | iov[0].iov_len = sizeof(hdr); | |
604 | iov[1].iov_base = &challenge; | |
605 | iov[1].iov_len = sizeof(challenge); | |
606 | ||
607 | len = iov[0].iov_len + iov[1].iov_len; | |
608 | ||
609 | hdr.serial = htonl(atomic_inc_return(&conn->serial)); | |
610 | _proto("Tx CHALLENGE %%%u", ntohl(hdr.serial)); | |
611 | ||
612 | ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len); | |
613 | if (ret < 0) { | |
614 | _debug("sendmsg failed: %d", ret); | |
615 | return -EAGAIN; | |
616 | } | |
617 | ||
618 | _leave(" = 0"); | |
619 | return 0; | |
620 | } | |
621 | ||
622 | /* | |
623 | * send a Kerberos security response | |
624 | */ | |
625 | static int rxkad_send_response(struct rxrpc_connection *conn, | |
626 | struct rxrpc_header *hdr, | |
627 | struct rxkad_response *resp, | |
628 | const struct rxkad_key *s2) | |
629 | { | |
630 | struct msghdr msg; | |
631 | struct kvec iov[3]; | |
632 | size_t len; | |
633 | int ret; | |
634 | ||
635 | _enter(""); | |
636 | ||
637 | msg.msg_name = &conn->trans->peer->srx.transport.sin; | |
638 | msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin); | |
639 | msg.msg_control = NULL; | |
640 | msg.msg_controllen = 0; | |
641 | msg.msg_flags = 0; | |
642 | ||
643 | hdr->epoch = conn->epoch; | |
644 | hdr->seq = 0; | |
645 | hdr->type = RXRPC_PACKET_TYPE_RESPONSE; | |
646 | hdr->flags = conn->out_clientflag; | |
647 | hdr->userStatus = 0; | |
648 | hdr->_rsvd = 0; | |
649 | ||
650 | iov[0].iov_base = hdr; | |
651 | iov[0].iov_len = sizeof(*hdr); | |
652 | iov[1].iov_base = resp; | |
653 | iov[1].iov_len = sizeof(*resp); | |
654 | iov[2].iov_base = (void *) s2->ticket; | |
655 | iov[2].iov_len = s2->ticket_len; | |
656 | ||
657 | len = iov[0].iov_len + iov[1].iov_len + iov[2].iov_len; | |
658 | ||
659 | hdr->serial = htonl(atomic_inc_return(&conn->serial)); | |
660 | _proto("Tx RESPONSE %%%u", ntohl(hdr->serial)); | |
661 | ||
662 | ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 3, len); | |
663 | if (ret < 0) { | |
664 | _debug("sendmsg failed: %d", ret); | |
665 | return -EAGAIN; | |
666 | } | |
667 | ||
668 | _leave(" = 0"); | |
669 | return 0; | |
670 | } | |
671 | ||
672 | /* | |
673 | * calculate the response checksum | |
674 | */ | |
675 | static void rxkad_calc_response_checksum(struct rxkad_response *response) | |
676 | { | |
677 | u32 csum = 1000003; | |
678 | int loop; | |
679 | u8 *p = (u8 *) response; | |
680 | ||
681 | for (loop = sizeof(*response); loop > 0; loop--) | |
682 | csum = csum * 0x10204081 + *p++; | |
683 | ||
684 | response->encrypted.checksum = htonl(csum); | |
685 | } | |
686 | ||
687 | /* | |
688 | * load a scatterlist with a potentially split-page buffer | |
689 | */ | |
690 | static void rxkad_sg_set_buf2(struct scatterlist sg[2], | |
691 | void *buf, size_t buflen) | |
692 | { | |
693 | ||
694 | memset(sg, 0, sizeof(sg)); | |
695 | ||
696 | sg_set_buf(&sg[0], buf, buflen); | |
697 | if (sg[0].offset + buflen > PAGE_SIZE) { | |
698 | /* the buffer was split over two pages */ | |
699 | sg[0].length = PAGE_SIZE - sg[0].offset; | |
700 | sg_set_buf(&sg[1], buf + sg[0].length, buflen - sg[0].length); | |
701 | } | |
702 | ||
703 | ASSERTCMP(sg[0].length + sg[1].length, ==, buflen); | |
704 | } | |
705 | ||
706 | /* | |
707 | * encrypt the response packet | |
708 | */ | |
709 | static void rxkad_encrypt_response(struct rxrpc_connection *conn, | |
710 | struct rxkad_response *resp, | |
711 | const struct rxkad_key *s2) | |
712 | { | |
713 | struct blkcipher_desc desc; | |
714 | struct rxrpc_crypt iv; | |
715 | struct scatterlist ssg[2], dsg[2]; | |
716 | ||
717 | /* continue encrypting from where we left off */ | |
718 | memcpy(&iv, s2->session_key, sizeof(iv)); | |
719 | desc.tfm = conn->cipher; | |
720 | desc.info = iv.x; | |
721 | desc.flags = 0; | |
722 | ||
723 | rxkad_sg_set_buf2(ssg, &resp->encrypted, sizeof(resp->encrypted)); | |
724 | memcpy(dsg, ssg, sizeof(dsg)); | |
725 | crypto_blkcipher_encrypt_iv(&desc, dsg, ssg, sizeof(resp->encrypted)); | |
726 | } | |
727 | ||
728 | /* | |
729 | * respond to a challenge packet | |
730 | */ | |
731 | static int rxkad_respond_to_challenge(struct rxrpc_connection *conn, | |
732 | struct sk_buff *skb, | |
733 | u32 *_abort_code) | |
734 | { | |
735 | const struct rxrpc_key_payload *payload; | |
736 | struct rxkad_challenge challenge; | |
737 | struct rxkad_response resp | |
738 | __attribute__((aligned(8))); /* must be aligned for crypto */ | |
739 | struct rxrpc_skb_priv *sp; | |
740 | u32 version, nonce, min_level, abort_code; | |
741 | int ret; | |
742 | ||
743 | _enter("{%d,%x}", conn->debug_id, key_serial(conn->key)); | |
744 | ||
745 | if (!conn->key) { | |
746 | _leave(" = -EPROTO [no key]"); | |
747 | return -EPROTO; | |
748 | } | |
749 | ||
750 | ret = key_validate(conn->key); | |
751 | if (ret < 0) { | |
752 | *_abort_code = RXKADEXPIRED; | |
753 | return ret; | |
754 | } | |
755 | ||
756 | abort_code = RXKADPACKETSHORT; | |
757 | sp = rxrpc_skb(skb); | |
758 | if (skb_copy_bits(skb, 0, &challenge, sizeof(challenge)) < 0) | |
759 | goto protocol_error; | |
760 | ||
761 | version = ntohl(challenge.version); | |
762 | nonce = ntohl(challenge.nonce); | |
763 | min_level = ntohl(challenge.min_level); | |
764 | ||
765 | _proto("Rx CHALLENGE %%%u { v=%u n=%u ml=%u }", | |
766 | ntohl(sp->hdr.serial), version, nonce, min_level); | |
767 | ||
768 | abort_code = RXKADINCONSISTENCY; | |
769 | if (version != RXKAD_VERSION) | |
770 | goto protocol_error; | |
771 | ||
772 | abort_code = RXKADLEVELFAIL; | |
773 | if (conn->security_level < min_level) | |
774 | goto protocol_error; | |
775 | ||
776 | payload = conn->key->payload.data; | |
777 | ||
778 | /* build the response packet */ | |
779 | memset(&resp, 0, sizeof(resp)); | |
780 | ||
781 | resp.version = RXKAD_VERSION; | |
782 | resp.encrypted.epoch = conn->epoch; | |
783 | resp.encrypted.cid = conn->cid; | |
784 | resp.encrypted.securityIndex = htonl(conn->security_ix); | |
785 | resp.encrypted.call_id[0] = | |
786 | (conn->channels[0] ? conn->channels[0]->call_id : 0); | |
787 | resp.encrypted.call_id[1] = | |
788 | (conn->channels[1] ? conn->channels[1]->call_id : 0); | |
789 | resp.encrypted.call_id[2] = | |
790 | (conn->channels[2] ? conn->channels[2]->call_id : 0); | |
791 | resp.encrypted.call_id[3] = | |
792 | (conn->channels[3] ? conn->channels[3]->call_id : 0); | |
793 | resp.encrypted.inc_nonce = htonl(nonce + 1); | |
794 | resp.encrypted.level = htonl(conn->security_level); | |
795 | resp.kvno = htonl(payload->k.kvno); | |
796 | resp.ticket_len = htonl(payload->k.ticket_len); | |
797 | ||
798 | /* calculate the response checksum and then do the encryption */ | |
799 | rxkad_calc_response_checksum(&resp); | |
800 | rxkad_encrypt_response(conn, &resp, &payload->k); | |
801 | return rxkad_send_response(conn, &sp->hdr, &resp, &payload->k); | |
802 | ||
803 | protocol_error: | |
804 | *_abort_code = abort_code; | |
805 | _leave(" = -EPROTO [%d]", abort_code); | |
806 | return -EPROTO; | |
807 | } | |
808 | ||
809 | /* | |
810 | * decrypt the kerberos IV ticket in the response | |
811 | */ | |
812 | static int rxkad_decrypt_ticket(struct rxrpc_connection *conn, | |
813 | void *ticket, size_t ticket_len, | |
814 | struct rxrpc_crypt *_session_key, | |
815 | time_t *_expiry, | |
816 | u32 *_abort_code) | |
817 | { | |
818 | struct blkcipher_desc desc; | |
819 | struct rxrpc_crypt iv, key; | |
820 | struct scatterlist ssg[1], dsg[1]; | |
821 | struct in_addr addr; | |
822 | unsigned life; | |
823 | time_t issue, now; | |
824 | bool little_endian; | |
825 | int ret; | |
826 | u8 *p, *q, *name, *end; | |
827 | ||
828 | _enter("{%d},{%x}", conn->debug_id, key_serial(conn->server_key)); | |
829 | ||
830 | *_expiry = 0; | |
831 | ||
832 | ret = key_validate(conn->server_key); | |
833 | if (ret < 0) { | |
834 | switch (ret) { | |
835 | case -EKEYEXPIRED: | |
836 | *_abort_code = RXKADEXPIRED; | |
837 | goto error; | |
838 | default: | |
839 | *_abort_code = RXKADNOAUTH; | |
840 | goto error; | |
841 | } | |
842 | } | |
843 | ||
844 | ASSERT(conn->server_key->payload.data != NULL); | |
845 | ASSERTCMP((unsigned long) ticket & 7UL, ==, 0); | |
846 | ||
847 | memcpy(&iv, &conn->server_key->type_data, sizeof(iv)); | |
848 | ||
849 | desc.tfm = conn->server_key->payload.data; | |
850 | desc.info = iv.x; | |
851 | desc.flags = 0; | |
852 | ||
853 | sg_init_one(&ssg[0], ticket, ticket_len); | |
854 | memcpy(dsg, ssg, sizeof(dsg)); | |
855 | crypto_blkcipher_decrypt_iv(&desc, dsg, ssg, ticket_len); | |
856 | ||
857 | p = ticket; | |
858 | end = p + ticket_len; | |
859 | ||
860 | #define Z(size) \ | |
861 | ({ \ | |
862 | u8 *__str = p; \ | |
863 | q = memchr(p, 0, end - p); \ | |
864 | if (!q || q - p > (size)) \ | |
865 | goto bad_ticket; \ | |
866 | for (; p < q; p++) \ | |
867 | if (!isprint(*p)) \ | |
868 | goto bad_ticket; \ | |
869 | p++; \ | |
870 | __str; \ | |
871 | }) | |
872 | ||
873 | /* extract the ticket flags */ | |
874 | _debug("KIV FLAGS: %x", *p); | |
875 | little_endian = *p & 1; | |
876 | p++; | |
877 | ||
878 | /* extract the authentication name */ | |
879 | name = Z(ANAME_SZ); | |
880 | _debug("KIV ANAME: %s", name); | |
881 | ||
882 | /* extract the principal's instance */ | |
883 | name = Z(INST_SZ); | |
884 | _debug("KIV INST : %s", name); | |
885 | ||
886 | /* extract the principal's authentication domain */ | |
887 | name = Z(REALM_SZ); | |
888 | _debug("KIV REALM: %s", name); | |
889 | ||
890 | if (end - p < 4 + 8 + 4 + 2) | |
891 | goto bad_ticket; | |
892 | ||
893 | /* get the IPv4 address of the entity that requested the ticket */ | |
894 | memcpy(&addr, p, sizeof(addr)); | |
895 | p += 4; | |
896 | _debug("KIV ADDR : "NIPQUAD_FMT, NIPQUAD(addr)); | |
897 | ||
898 | /* get the session key from the ticket */ | |
899 | memcpy(&key, p, sizeof(key)); | |
900 | p += 8; | |
901 | _debug("KIV KEY : %08x %08x", ntohl(key.n[0]), ntohl(key.n[1])); | |
902 | memcpy(_session_key, &key, sizeof(key)); | |
903 | ||
904 | /* get the ticket's lifetime */ | |
905 | life = *p++ * 5 * 60; | |
906 | _debug("KIV LIFE : %u", life); | |
907 | ||
908 | /* get the issue time of the ticket */ | |
909 | if (little_endian) { | |
910 | __le32 stamp; | |
911 | memcpy(&stamp, p, 4); | |
912 | issue = le32_to_cpu(stamp); | |
913 | } else { | |
914 | __be32 stamp; | |
915 | memcpy(&stamp, p, 4); | |
916 | issue = be32_to_cpu(stamp); | |
917 | } | |
918 | p += 4; | |
919 | now = xtime.tv_sec; | |
920 | _debug("KIV ISSUE: %lx [%lx]", issue, now); | |
921 | ||
922 | /* check the ticket is in date */ | |
923 | if (issue > now) { | |
924 | *_abort_code = RXKADNOAUTH; | |
925 | ret = -EKEYREJECTED; | |
926 | goto error; | |
927 | } | |
928 | ||
929 | if (issue < now - life) { | |
930 | *_abort_code = RXKADEXPIRED; | |
931 | ret = -EKEYEXPIRED; | |
932 | goto error; | |
933 | } | |
934 | ||
935 | *_expiry = issue + life; | |
936 | ||
937 | /* get the service name */ | |
938 | name = Z(SNAME_SZ); | |
939 | _debug("KIV SNAME: %s", name); | |
940 | ||
941 | /* get the service instance name */ | |
942 | name = Z(INST_SZ); | |
943 | _debug("KIV SINST: %s", name); | |
944 | ||
945 | ret = 0; | |
946 | error: | |
947 | _leave(" = %d", ret); | |
948 | return ret; | |
949 | ||
950 | bad_ticket: | |
951 | *_abort_code = RXKADBADTICKET; | |
952 | ret = -EBADMSG; | |
953 | goto error; | |
954 | } | |
955 | ||
956 | /* | |
957 | * decrypt the response packet | |
958 | */ | |
959 | static void rxkad_decrypt_response(struct rxrpc_connection *conn, | |
960 | struct rxkad_response *resp, | |
961 | const struct rxrpc_crypt *session_key) | |
962 | { | |
963 | struct blkcipher_desc desc; | |
964 | struct scatterlist ssg[2], dsg[2]; | |
965 | struct rxrpc_crypt iv; | |
966 | ||
967 | _enter(",,%08x%08x", | |
968 | ntohl(session_key->n[0]), ntohl(session_key->n[1])); | |
969 | ||
970 | ASSERT(rxkad_ci != NULL); | |
971 | ||
972 | mutex_lock(&rxkad_ci_mutex); | |
973 | if (crypto_blkcipher_setkey(rxkad_ci, session_key->x, | |
974 | sizeof(*session_key)) < 0) | |
975 | BUG(); | |
976 | ||
977 | memcpy(&iv, session_key, sizeof(iv)); | |
978 | desc.tfm = rxkad_ci; | |
979 | desc.info = iv.x; | |
980 | desc.flags = 0; | |
981 | ||
982 | rxkad_sg_set_buf2(ssg, &resp->encrypted, sizeof(resp->encrypted)); | |
983 | memcpy(dsg, ssg, sizeof(dsg)); | |
984 | crypto_blkcipher_decrypt_iv(&desc, dsg, ssg, sizeof(resp->encrypted)); | |
985 | mutex_unlock(&rxkad_ci_mutex); | |
986 | ||
987 | _leave(""); | |
988 | } | |
989 | ||
990 | /* | |
991 | * verify a response | |
992 | */ | |
993 | static int rxkad_verify_response(struct rxrpc_connection *conn, | |
994 | struct sk_buff *skb, | |
995 | u32 *_abort_code) | |
996 | { | |
997 | struct rxkad_response response | |
998 | __attribute__((aligned(8))); /* must be aligned for crypto */ | |
999 | struct rxrpc_skb_priv *sp; | |
1000 | struct rxrpc_crypt session_key; | |
1001 | time_t expiry; | |
1002 | void *ticket; | |
1003 | u32 abort_code, version, kvno, ticket_len, csum, level; | |
1004 | int ret; | |
1005 | ||
1006 | _enter("{%d,%x}", conn->debug_id, key_serial(conn->server_key)); | |
1007 | ||
1008 | abort_code = RXKADPACKETSHORT; | |
1009 | if (skb_copy_bits(skb, 0, &response, sizeof(response)) < 0) | |
1010 | goto protocol_error; | |
1011 | if (!pskb_pull(skb, sizeof(response))) | |
1012 | BUG(); | |
1013 | ||
1014 | version = ntohl(response.version); | |
1015 | ticket_len = ntohl(response.ticket_len); | |
1016 | kvno = ntohl(response.kvno); | |
1017 | sp = rxrpc_skb(skb); | |
1018 | _proto("Rx RESPONSE %%%u { v=%u kv=%u tl=%u }", | |
1019 | ntohl(sp->hdr.serial), version, kvno, ticket_len); | |
1020 | ||
1021 | abort_code = RXKADINCONSISTENCY; | |
1022 | if (version != RXKAD_VERSION) | |
1023 | ||
1024 | abort_code = RXKADTICKETLEN; | |
1025 | if (ticket_len < 4 || ticket_len > MAXKRB5TICKETLEN) | |
1026 | goto protocol_error; | |
1027 | ||
1028 | abort_code = RXKADUNKNOWNKEY; | |
1029 | if (kvno >= RXKAD_TKT_TYPE_KERBEROS_V5) | |
1030 | goto protocol_error; | |
1031 | ||
1032 | /* extract the kerberos ticket and decrypt and decode it */ | |
1033 | ticket = kmalloc(ticket_len, GFP_NOFS); | |
1034 | if (!ticket) | |
1035 | return -ENOMEM; | |
1036 | ||
1037 | abort_code = RXKADPACKETSHORT; | |
1038 | if (skb_copy_bits(skb, 0, ticket, ticket_len) < 0) | |
1039 | goto protocol_error_free; | |
1040 | ||
1041 | ret = rxkad_decrypt_ticket(conn, ticket, ticket_len, &session_key, | |
1042 | &expiry, &abort_code); | |
1043 | if (ret < 0) { | |
1044 | *_abort_code = abort_code; | |
1045 | kfree(ticket); | |
1046 | return ret; | |
1047 | } | |
1048 | ||
1049 | /* use the session key from inside the ticket to decrypt the | |
1050 | * response */ | |
1051 | rxkad_decrypt_response(conn, &response, &session_key); | |
1052 | ||
1053 | abort_code = RXKADSEALEDINCON; | |
1054 | if (response.encrypted.epoch != conn->epoch) | |
1055 | goto protocol_error_free; | |
1056 | if (response.encrypted.cid != conn->cid) | |
1057 | goto protocol_error_free; | |
1058 | if (ntohl(response.encrypted.securityIndex) != conn->security_ix) | |
1059 | goto protocol_error_free; | |
1060 | csum = response.encrypted.checksum; | |
1061 | response.encrypted.checksum = 0; | |
1062 | rxkad_calc_response_checksum(&response); | |
1063 | if (response.encrypted.checksum != csum) | |
1064 | goto protocol_error_free; | |
1065 | ||
1066 | if (ntohl(response.encrypted.call_id[0]) > INT_MAX || | |
1067 | ntohl(response.encrypted.call_id[1]) > INT_MAX || | |
1068 | ntohl(response.encrypted.call_id[2]) > INT_MAX || | |
1069 | ntohl(response.encrypted.call_id[3]) > INT_MAX) | |
1070 | goto protocol_error_free; | |
1071 | ||
1072 | abort_code = RXKADOUTOFSEQUENCE; | |
1073 | if (response.encrypted.inc_nonce != htonl(conn->security_nonce + 1)) | |
1074 | goto protocol_error_free; | |
1075 | ||
1076 | abort_code = RXKADLEVELFAIL; | |
1077 | level = ntohl(response.encrypted.level); | |
1078 | if (level > RXRPC_SECURITY_ENCRYPT) | |
1079 | goto protocol_error_free; | |
1080 | conn->security_level = level; | |
1081 | ||
1082 | /* create a key to hold the security data and expiration time - after | |
1083 | * this the connection security can be handled in exactly the same way | |
1084 | * as for a client connection */ | |
1085 | ret = rxrpc_get_server_data_key(conn, &session_key, expiry, kvno); | |
1086 | if (ret < 0) { | |
1087 | kfree(ticket); | |
1088 | return ret; | |
1089 | } | |
1090 | ||
1091 | kfree(ticket); | |
1092 | _leave(" = 0"); | |
1093 | return 0; | |
1094 | ||
1095 | protocol_error_free: | |
1096 | kfree(ticket); | |
1097 | protocol_error: | |
1098 | *_abort_code = abort_code; | |
1099 | _leave(" = -EPROTO [%d]", abort_code); | |
1100 | return -EPROTO; | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * clear the connection security | |
1105 | */ | |
1106 | static void rxkad_clear(struct rxrpc_connection *conn) | |
1107 | { | |
1108 | _enter(""); | |
1109 | ||
1110 | if (conn->cipher) | |
1111 | crypto_free_blkcipher(conn->cipher); | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * RxRPC Kerberos-based security | |
1116 | */ | |
1117 | static struct rxrpc_security rxkad = { | |
1118 | .owner = THIS_MODULE, | |
1119 | .name = "rxkad", | |
1120 | .security_index = RXKAD_VERSION, | |
1121 | .init_connection_security = rxkad_init_connection_security, | |
1122 | .prime_packet_security = rxkad_prime_packet_security, | |
1123 | .secure_packet = rxkad_secure_packet, | |
1124 | .verify_packet = rxkad_verify_packet, | |
1125 | .issue_challenge = rxkad_issue_challenge, | |
1126 | .respond_to_challenge = rxkad_respond_to_challenge, | |
1127 | .verify_response = rxkad_verify_response, | |
1128 | .clear = rxkad_clear, | |
1129 | }; | |
1130 | ||
1131 | static __init int rxkad_init(void) | |
1132 | { | |
1133 | _enter(""); | |
1134 | ||
1135 | /* pin the cipher we need so that the crypto layer doesn't invoke | |
1136 | * keventd to go get it */ | |
1137 | rxkad_ci = crypto_alloc_blkcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC); | |
1138 | if (IS_ERR(rxkad_ci)) | |
1139 | return PTR_ERR(rxkad_ci); | |
1140 | ||
1141 | return rxrpc_register_security(&rxkad); | |
1142 | } | |
1143 | ||
1144 | module_init(rxkad_init); | |
1145 | ||
1146 | static __exit void rxkad_exit(void) | |
1147 | { | |
1148 | _enter(""); | |
1149 | ||
1150 | rxrpc_unregister_security(&rxkad); | |
1151 | crypto_free_blkcipher(rxkad_ci); | |
1152 | } | |
1153 | ||
1154 | module_exit(rxkad_exit); |