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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); | |
424b00e2 | 34 | MODULE_PARM_DESC(debug, "rxkad debugging mask"); |
17926a79 DH |
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 | ||
68e3f5dd HX |
138 | sg_init_one(&sg[0], &tmpbuf, sizeof(tmpbuf)); |
139 | sg_init_one(&sg[1], &tmpbuf, sizeof(tmpbuf)); | |
17926a79 DH |
140 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf)); |
141 | ||
142 | memcpy(&conn->csum_iv, &tmpbuf.x[2], sizeof(conn->csum_iv)); | |
143 | ASSERTCMP(conn->csum_iv.n[0], ==, tmpbuf.x[2]); | |
144 | ||
145 | _leave(""); | |
146 | } | |
147 | ||
148 | /* | |
149 | * partially encrypt a packet (level 1 security) | |
150 | */ | |
151 | static int rxkad_secure_packet_auth(const struct rxrpc_call *call, | |
152 | struct sk_buff *skb, | |
153 | u32 data_size, | |
154 | void *sechdr) | |
155 | { | |
156 | struct rxrpc_skb_priv *sp; | |
157 | struct blkcipher_desc desc; | |
158 | struct rxrpc_crypt iv; | |
159 | struct scatterlist sg[2]; | |
160 | struct { | |
161 | struct rxkad_level1_hdr hdr; | |
162 | __be32 first; /* first four bytes of data and padding */ | |
163 | } tmpbuf __attribute__((aligned(8))); /* must all be in same page */ | |
164 | u16 check; | |
165 | ||
166 | sp = rxrpc_skb(skb); | |
167 | ||
168 | _enter(""); | |
169 | ||
170 | check = ntohl(sp->hdr.seq ^ sp->hdr.callNumber); | |
171 | data_size |= (u32) check << 16; | |
172 | ||
173 | tmpbuf.hdr.data_size = htonl(data_size); | |
174 | memcpy(&tmpbuf.first, sechdr + 4, sizeof(tmpbuf.first)); | |
175 | ||
176 | /* start the encryption afresh */ | |
177 | memset(&iv, 0, sizeof(iv)); | |
178 | desc.tfm = call->conn->cipher; | |
179 | desc.info = iv.x; | |
180 | desc.flags = 0; | |
181 | ||
68e3f5dd HX |
182 | sg_init_one(&sg[0], &tmpbuf, sizeof(tmpbuf)); |
183 | sg_init_one(&sg[1], &tmpbuf, sizeof(tmpbuf)); | |
17926a79 DH |
184 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf)); |
185 | ||
186 | memcpy(sechdr, &tmpbuf, sizeof(tmpbuf)); | |
187 | ||
188 | _leave(" = 0"); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* | |
193 | * wholly encrypt a packet (level 2 security) | |
194 | */ | |
195 | static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call, | |
196 | struct sk_buff *skb, | |
197 | u32 data_size, | |
198 | void *sechdr) | |
199 | { | |
200 | const struct rxrpc_key_payload *payload; | |
201 | struct rxkad_level2_hdr rxkhdr | |
202 | __attribute__((aligned(8))); /* must be all on one page */ | |
203 | struct rxrpc_skb_priv *sp; | |
204 | struct blkcipher_desc desc; | |
205 | struct rxrpc_crypt iv; | |
206 | struct scatterlist sg[16]; | |
207 | struct sk_buff *trailer; | |
208 | unsigned len; | |
209 | u16 check; | |
210 | int nsg; | |
211 | ||
212 | sp = rxrpc_skb(skb); | |
213 | ||
214 | _enter(""); | |
215 | ||
216 | check = ntohl(sp->hdr.seq ^ sp->hdr.callNumber); | |
217 | ||
218 | rxkhdr.data_size = htonl(data_size | (u32) check << 16); | |
219 | rxkhdr.checksum = 0; | |
220 | ||
221 | /* encrypt from the session key */ | |
222 | payload = call->conn->key->payload.data; | |
223 | memcpy(&iv, payload->k.session_key, sizeof(iv)); | |
224 | desc.tfm = call->conn->cipher; | |
225 | desc.info = iv.x; | |
226 | desc.flags = 0; | |
227 | ||
68e3f5dd HX |
228 | sg_init_one(&sg[0], sechdr, sizeof(rxkhdr)); |
229 | sg_init_one(&sg[1], &rxkhdr, sizeof(rxkhdr)); | |
17926a79 DH |
230 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(rxkhdr)); |
231 | ||
232 | /* we want to encrypt the skbuff in-place */ | |
233 | nsg = skb_cow_data(skb, 0, &trailer); | |
234 | if (nsg < 0 || nsg > 16) | |
235 | return -ENOMEM; | |
236 | ||
237 | len = data_size + call->conn->size_align - 1; | |
238 | len &= ~(call->conn->size_align - 1); | |
239 | ||
51c739d1 DM |
240 | sg_init_table(sg, nsg); |
241 | skb_to_sgvec(skb, sg, 0, len); | |
17926a79 DH |
242 | crypto_blkcipher_encrypt_iv(&desc, sg, sg, len); |
243 | ||
244 | _leave(" = 0"); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | /* | |
249 | * checksum an RxRPC packet header | |
250 | */ | |
251 | static int rxkad_secure_packet(const struct rxrpc_call *call, | |
252 | struct sk_buff *skb, | |
253 | size_t data_size, | |
254 | void *sechdr) | |
255 | { | |
256 | struct rxrpc_skb_priv *sp; | |
257 | struct blkcipher_desc desc; | |
258 | struct rxrpc_crypt iv; | |
259 | struct scatterlist sg[2]; | |
260 | struct { | |
261 | __be32 x[2]; | |
262 | } tmpbuf __attribute__((aligned(8))); /* must all be in same page */ | |
263 | __be32 x; | |
91e916cf | 264 | u32 y; |
17926a79 DH |
265 | int ret; |
266 | ||
267 | sp = rxrpc_skb(skb); | |
268 | ||
269 | _enter("{%d{%x}},{#%u},%zu,", | |
270 | call->debug_id, key_serial(call->conn->key), ntohl(sp->hdr.seq), | |
271 | data_size); | |
272 | ||
273 | if (!call->conn->cipher) | |
274 | return 0; | |
275 | ||
276 | ret = key_validate(call->conn->key); | |
277 | if (ret < 0) | |
278 | return ret; | |
279 | ||
280 | /* continue encrypting from where we left off */ | |
281 | memcpy(&iv, call->conn->csum_iv.x, sizeof(iv)); | |
282 | desc.tfm = call->conn->cipher; | |
283 | desc.info = iv.x; | |
284 | desc.flags = 0; | |
285 | ||
286 | /* calculate the security checksum */ | |
287 | x = htonl(call->channel << (32 - RXRPC_CIDSHIFT)); | |
ae445d17 | 288 | x |= sp->hdr.seq & cpu_to_be32(0x3fffffff); |
17926a79 DH |
289 | tmpbuf.x[0] = sp->hdr.callNumber; |
290 | tmpbuf.x[1] = x; | |
291 | ||
68e3f5dd HX |
292 | sg_init_one(&sg[0], &tmpbuf, sizeof(tmpbuf)); |
293 | sg_init_one(&sg[1], &tmpbuf, sizeof(tmpbuf)); | |
17926a79 DH |
294 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf)); |
295 | ||
91e916cf AV |
296 | y = ntohl(tmpbuf.x[1]); |
297 | y = (y >> 16) & 0xffff; | |
298 | if (y == 0) | |
299 | y = 1; /* zero checksums are not permitted */ | |
300 | sp->hdr.cksum = htons(y); | |
17926a79 DH |
301 | |
302 | switch (call->conn->security_level) { | |
303 | case RXRPC_SECURITY_PLAIN: | |
304 | ret = 0; | |
305 | break; | |
306 | case RXRPC_SECURITY_AUTH: | |
307 | ret = rxkad_secure_packet_auth(call, skb, data_size, sechdr); | |
308 | break; | |
309 | case RXRPC_SECURITY_ENCRYPT: | |
310 | ret = rxkad_secure_packet_encrypt(call, skb, data_size, | |
311 | sechdr); | |
312 | break; | |
313 | default: | |
314 | ret = -EPERM; | |
315 | break; | |
316 | } | |
317 | ||
91e916cf | 318 | _leave(" = %d [set %hx]", ret, y); |
17926a79 DH |
319 | return ret; |
320 | } | |
321 | ||
322 | /* | |
323 | * decrypt partial encryption on a packet (level 1 security) | |
324 | */ | |
325 | static int rxkad_verify_packet_auth(const struct rxrpc_call *call, | |
326 | struct sk_buff *skb, | |
327 | u32 *_abort_code) | |
328 | { | |
329 | struct rxkad_level1_hdr sechdr; | |
330 | struct rxrpc_skb_priv *sp; | |
331 | struct blkcipher_desc desc; | |
332 | struct rxrpc_crypt iv; | |
68e3f5dd | 333 | struct scatterlist sg[16]; |
17926a79 DH |
334 | struct sk_buff *trailer; |
335 | u32 data_size, buf; | |
336 | u16 check; | |
68e3f5dd | 337 | int nsg; |
17926a79 DH |
338 | |
339 | _enter(""); | |
340 | ||
341 | sp = rxrpc_skb(skb); | |
342 | ||
343 | /* we want to decrypt the skbuff in-place */ | |
68e3f5dd HX |
344 | nsg = skb_cow_data(skb, 0, &trailer); |
345 | if (nsg < 0 || nsg > 16) | |
17926a79 DH |
346 | goto nomem; |
347 | ||
68e3f5dd | 348 | sg_init_table(sg, nsg); |
51c739d1 | 349 | skb_to_sgvec(skb, sg, 0, 8); |
17926a79 DH |
350 | |
351 | /* start the decryption afresh */ | |
352 | memset(&iv, 0, sizeof(iv)); | |
353 | desc.tfm = call->conn->cipher; | |
354 | desc.info = iv.x; | |
355 | desc.flags = 0; | |
356 | ||
357 | crypto_blkcipher_decrypt_iv(&desc, sg, sg, 8); | |
358 | ||
359 | /* remove the decrypted packet length */ | |
360 | if (skb_copy_bits(skb, 0, &sechdr, sizeof(sechdr)) < 0) | |
361 | goto datalen_error; | |
362 | if (!skb_pull(skb, sizeof(sechdr))) | |
363 | BUG(); | |
364 | ||
365 | buf = ntohl(sechdr.data_size); | |
366 | data_size = buf & 0xffff; | |
367 | ||
368 | check = buf >> 16; | |
369 | check ^= ntohl(sp->hdr.seq ^ sp->hdr.callNumber); | |
370 | check &= 0xffff; | |
371 | if (check != 0) { | |
372 | *_abort_code = RXKADSEALEDINCON; | |
373 | goto protocol_error; | |
374 | } | |
375 | ||
376 | /* shorten the packet to remove the padding */ | |
377 | if (data_size > skb->len) | |
378 | goto datalen_error; | |
379 | else if (data_size < skb->len) | |
380 | skb->len = data_size; | |
381 | ||
382 | _leave(" = 0 [dlen=%x]", data_size); | |
383 | return 0; | |
384 | ||
385 | datalen_error: | |
386 | *_abort_code = RXKADDATALEN; | |
387 | protocol_error: | |
388 | _leave(" = -EPROTO"); | |
389 | return -EPROTO; | |
390 | ||
391 | nomem: | |
392 | _leave(" = -ENOMEM"); | |
393 | return -ENOMEM; | |
394 | } | |
395 | ||
396 | /* | |
397 | * wholly decrypt a packet (level 2 security) | |
398 | */ | |
399 | static int rxkad_verify_packet_encrypt(const struct rxrpc_call *call, | |
400 | struct sk_buff *skb, | |
401 | u32 *_abort_code) | |
402 | { | |
403 | const struct rxrpc_key_payload *payload; | |
404 | struct rxkad_level2_hdr sechdr; | |
405 | struct rxrpc_skb_priv *sp; | |
406 | struct blkcipher_desc desc; | |
407 | struct rxrpc_crypt iv; | |
408 | struct scatterlist _sg[4], *sg; | |
409 | struct sk_buff *trailer; | |
410 | u32 data_size, buf; | |
411 | u16 check; | |
412 | int nsg; | |
413 | ||
414 | _enter(",{%d}", skb->len); | |
415 | ||
416 | sp = rxrpc_skb(skb); | |
417 | ||
418 | /* we want to decrypt the skbuff in-place */ | |
419 | nsg = skb_cow_data(skb, 0, &trailer); | |
420 | if (nsg < 0) | |
421 | goto nomem; | |
422 | ||
423 | sg = _sg; | |
424 | if (unlikely(nsg > 4)) { | |
425 | sg = kmalloc(sizeof(*sg) * nsg, GFP_NOIO); | |
426 | if (!sg) | |
427 | goto nomem; | |
428 | } | |
429 | ||
68e3f5dd | 430 | sg_init_table(sg, nsg); |
51c739d1 | 431 | skb_to_sgvec(skb, sg, 0, skb->len); |
17926a79 DH |
432 | |
433 | /* decrypt from the session key */ | |
434 | payload = call->conn->key->payload.data; | |
435 | memcpy(&iv, payload->k.session_key, sizeof(iv)); | |
436 | desc.tfm = call->conn->cipher; | |
437 | desc.info = iv.x; | |
438 | desc.flags = 0; | |
439 | ||
440 | crypto_blkcipher_decrypt_iv(&desc, sg, sg, skb->len); | |
441 | if (sg != _sg) | |
442 | kfree(sg); | |
443 | ||
444 | /* remove the decrypted packet length */ | |
445 | if (skb_copy_bits(skb, 0, &sechdr, sizeof(sechdr)) < 0) | |
446 | goto datalen_error; | |
447 | if (!skb_pull(skb, sizeof(sechdr))) | |
448 | BUG(); | |
449 | ||
450 | buf = ntohl(sechdr.data_size); | |
451 | data_size = buf & 0xffff; | |
452 | ||
453 | check = buf >> 16; | |
454 | check ^= ntohl(sp->hdr.seq ^ sp->hdr.callNumber); | |
455 | check &= 0xffff; | |
456 | if (check != 0) { | |
457 | *_abort_code = RXKADSEALEDINCON; | |
458 | goto protocol_error; | |
459 | } | |
460 | ||
461 | /* shorten the packet to remove the padding */ | |
462 | if (data_size > skb->len) | |
463 | goto datalen_error; | |
464 | else if (data_size < skb->len) | |
465 | skb->len = data_size; | |
466 | ||
467 | _leave(" = 0 [dlen=%x]", data_size); | |
468 | return 0; | |
469 | ||
470 | datalen_error: | |
471 | *_abort_code = RXKADDATALEN; | |
472 | protocol_error: | |
473 | _leave(" = -EPROTO"); | |
474 | return -EPROTO; | |
475 | ||
476 | nomem: | |
477 | _leave(" = -ENOMEM"); | |
478 | return -ENOMEM; | |
479 | } | |
480 | ||
481 | /* | |
482 | * verify the security on a received packet | |
483 | */ | |
484 | static int rxkad_verify_packet(const struct rxrpc_call *call, | |
485 | struct sk_buff *skb, | |
486 | u32 *_abort_code) | |
487 | { | |
488 | struct blkcipher_desc desc; | |
489 | struct rxrpc_skb_priv *sp; | |
490 | struct rxrpc_crypt iv; | |
491 | struct scatterlist sg[2]; | |
492 | struct { | |
493 | __be32 x[2]; | |
494 | } tmpbuf __attribute__((aligned(8))); /* must all be in same page */ | |
495 | __be32 x; | |
496 | __be16 cksum; | |
02f37050 | 497 | u32 y; |
17926a79 DH |
498 | int ret; |
499 | ||
500 | sp = rxrpc_skb(skb); | |
501 | ||
502 | _enter("{%d{%x}},{#%u}", | |
503 | call->debug_id, key_serial(call->conn->key), | |
504 | ntohl(sp->hdr.seq)); | |
505 | ||
506 | if (!call->conn->cipher) | |
507 | return 0; | |
508 | ||
509 | if (sp->hdr.securityIndex != 2) { | |
510 | *_abort_code = RXKADINCONSISTENCY; | |
511 | _leave(" = -EPROTO [not rxkad]"); | |
512 | return -EPROTO; | |
513 | } | |
514 | ||
515 | /* continue encrypting from where we left off */ | |
516 | memcpy(&iv, call->conn->csum_iv.x, sizeof(iv)); | |
517 | desc.tfm = call->conn->cipher; | |
518 | desc.info = iv.x; | |
519 | desc.flags = 0; | |
520 | ||
521 | /* validate the security checksum */ | |
522 | x = htonl(call->channel << (32 - RXRPC_CIDSHIFT)); | |
ae445d17 | 523 | x |= sp->hdr.seq & cpu_to_be32(0x3fffffff); |
17926a79 DH |
524 | tmpbuf.x[0] = call->call_id; |
525 | tmpbuf.x[1] = x; | |
526 | ||
68e3f5dd HX |
527 | sg_init_one(&sg[0], &tmpbuf, sizeof(tmpbuf)); |
528 | sg_init_one(&sg[1], &tmpbuf, sizeof(tmpbuf)); | |
17926a79 DH |
529 | crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf)); |
530 | ||
91e916cf AV |
531 | y = ntohl(tmpbuf.x[1]); |
532 | y = (y >> 16) & 0xffff; | |
533 | if (y == 0) | |
534 | y = 1; /* zero checksums are not permitted */ | |
17926a79 | 535 | |
91e916cf | 536 | cksum = htons(y); |
17926a79 DH |
537 | if (sp->hdr.cksum != cksum) { |
538 | *_abort_code = RXKADSEALEDINCON; | |
539 | _leave(" = -EPROTO [csum failed]"); | |
540 | return -EPROTO; | |
541 | } | |
542 | ||
543 | switch (call->conn->security_level) { | |
544 | case RXRPC_SECURITY_PLAIN: | |
545 | ret = 0; | |
546 | break; | |
547 | case RXRPC_SECURITY_AUTH: | |
548 | ret = rxkad_verify_packet_auth(call, skb, _abort_code); | |
549 | break; | |
550 | case RXRPC_SECURITY_ENCRYPT: | |
551 | ret = rxkad_verify_packet_encrypt(call, skb, _abort_code); | |
552 | break; | |
553 | default: | |
554 | ret = -ENOANO; | |
555 | break; | |
556 | } | |
557 | ||
558 | _leave(" = %d", ret); | |
559 | return ret; | |
560 | } | |
561 | ||
562 | /* | |
563 | * issue a challenge | |
564 | */ | |
565 | static int rxkad_issue_challenge(struct rxrpc_connection *conn) | |
566 | { | |
567 | struct rxkad_challenge challenge; | |
568 | struct rxrpc_header hdr; | |
569 | struct msghdr msg; | |
570 | struct kvec iov[2]; | |
571 | size_t len; | |
572 | int ret; | |
573 | ||
574 | _enter("{%d,%x}", conn->debug_id, key_serial(conn->key)); | |
575 | ||
576 | ret = key_validate(conn->key); | |
577 | if (ret < 0) | |
578 | return ret; | |
579 | ||
580 | get_random_bytes(&conn->security_nonce, sizeof(conn->security_nonce)); | |
581 | ||
582 | challenge.version = htonl(2); | |
583 | challenge.nonce = htonl(conn->security_nonce); | |
584 | challenge.min_level = htonl(0); | |
585 | challenge.__padding = 0; | |
586 | ||
587 | msg.msg_name = &conn->trans->peer->srx.transport.sin; | |
588 | msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin); | |
589 | msg.msg_control = NULL; | |
590 | msg.msg_controllen = 0; | |
591 | msg.msg_flags = 0; | |
592 | ||
593 | hdr.epoch = conn->epoch; | |
594 | hdr.cid = conn->cid; | |
595 | hdr.callNumber = 0; | |
596 | hdr.seq = 0; | |
597 | hdr.type = RXRPC_PACKET_TYPE_CHALLENGE; | |
598 | hdr.flags = conn->out_clientflag; | |
599 | hdr.userStatus = 0; | |
600 | hdr.securityIndex = conn->security_ix; | |
601 | hdr._rsvd = 0; | |
602 | hdr.serviceId = conn->service_id; | |
603 | ||
604 | iov[0].iov_base = &hdr; | |
605 | iov[0].iov_len = sizeof(hdr); | |
606 | iov[1].iov_base = &challenge; | |
607 | iov[1].iov_len = sizeof(challenge); | |
608 | ||
609 | len = iov[0].iov_len + iov[1].iov_len; | |
610 | ||
611 | hdr.serial = htonl(atomic_inc_return(&conn->serial)); | |
612 | _proto("Tx CHALLENGE %%%u", ntohl(hdr.serial)); | |
613 | ||
614 | ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len); | |
615 | if (ret < 0) { | |
616 | _debug("sendmsg failed: %d", ret); | |
617 | return -EAGAIN; | |
618 | } | |
619 | ||
620 | _leave(" = 0"); | |
621 | return 0; | |
622 | } | |
623 | ||
624 | /* | |
625 | * send a Kerberos security response | |
626 | */ | |
627 | static int rxkad_send_response(struct rxrpc_connection *conn, | |
628 | struct rxrpc_header *hdr, | |
629 | struct rxkad_response *resp, | |
630 | const struct rxkad_key *s2) | |
631 | { | |
632 | struct msghdr msg; | |
633 | struct kvec iov[3]; | |
634 | size_t len; | |
635 | int ret; | |
636 | ||
637 | _enter(""); | |
638 | ||
639 | msg.msg_name = &conn->trans->peer->srx.transport.sin; | |
640 | msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin); | |
641 | msg.msg_control = NULL; | |
642 | msg.msg_controllen = 0; | |
643 | msg.msg_flags = 0; | |
644 | ||
645 | hdr->epoch = conn->epoch; | |
646 | hdr->seq = 0; | |
647 | hdr->type = RXRPC_PACKET_TYPE_RESPONSE; | |
648 | hdr->flags = conn->out_clientflag; | |
649 | hdr->userStatus = 0; | |
650 | hdr->_rsvd = 0; | |
651 | ||
652 | iov[0].iov_base = hdr; | |
653 | iov[0].iov_len = sizeof(*hdr); | |
654 | iov[1].iov_base = resp; | |
655 | iov[1].iov_len = sizeof(*resp); | |
656 | iov[2].iov_base = (void *) s2->ticket; | |
657 | iov[2].iov_len = s2->ticket_len; | |
658 | ||
659 | len = iov[0].iov_len + iov[1].iov_len + iov[2].iov_len; | |
660 | ||
661 | hdr->serial = htonl(atomic_inc_return(&conn->serial)); | |
662 | _proto("Tx RESPONSE %%%u", ntohl(hdr->serial)); | |
663 | ||
664 | ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 3, len); | |
665 | if (ret < 0) { | |
666 | _debug("sendmsg failed: %d", ret); | |
667 | return -EAGAIN; | |
668 | } | |
669 | ||
670 | _leave(" = 0"); | |
671 | return 0; | |
672 | } | |
673 | ||
674 | /* | |
675 | * calculate the response checksum | |
676 | */ | |
677 | static void rxkad_calc_response_checksum(struct rxkad_response *response) | |
678 | { | |
679 | u32 csum = 1000003; | |
680 | int loop; | |
681 | u8 *p = (u8 *) response; | |
682 | ||
683 | for (loop = sizeof(*response); loop > 0; loop--) | |
684 | csum = csum * 0x10204081 + *p++; | |
685 | ||
686 | response->encrypted.checksum = htonl(csum); | |
687 | } | |
688 | ||
689 | /* | |
690 | * load a scatterlist with a potentially split-page buffer | |
691 | */ | |
692 | static void rxkad_sg_set_buf2(struct scatterlist sg[2], | |
693 | void *buf, size_t buflen) | |
694 | { | |
68e3f5dd | 695 | int nsg = 1; |
17926a79 | 696 | |
68e3f5dd | 697 | sg_init_table(sg, 2); |
17926a79 DH |
698 | |
699 | sg_set_buf(&sg[0], buf, buflen); | |
700 | if (sg[0].offset + buflen > PAGE_SIZE) { | |
701 | /* the buffer was split over two pages */ | |
702 | sg[0].length = PAGE_SIZE - sg[0].offset; | |
703 | sg_set_buf(&sg[1], buf + sg[0].length, buflen - sg[0].length); | |
68e3f5dd | 704 | nsg++; |
17926a79 DH |
705 | } |
706 | ||
c46f2334 | 707 | sg_mark_end(&sg[nsg - 1]); |
68e3f5dd | 708 | |
17926a79 DH |
709 | ASSERTCMP(sg[0].length + sg[1].length, ==, buflen); |
710 | } | |
711 | ||
712 | /* | |
713 | * encrypt the response packet | |
714 | */ | |
715 | static void rxkad_encrypt_response(struct rxrpc_connection *conn, | |
716 | struct rxkad_response *resp, | |
717 | const struct rxkad_key *s2) | |
718 | { | |
719 | struct blkcipher_desc desc; | |
720 | struct rxrpc_crypt iv; | |
68e3f5dd | 721 | struct scatterlist sg[2]; |
17926a79 DH |
722 | |
723 | /* continue encrypting from where we left off */ | |
724 | memcpy(&iv, s2->session_key, sizeof(iv)); | |
725 | desc.tfm = conn->cipher; | |
726 | desc.info = iv.x; | |
727 | desc.flags = 0; | |
728 | ||
68e3f5dd HX |
729 | rxkad_sg_set_buf2(sg, &resp->encrypted, sizeof(resp->encrypted)); |
730 | crypto_blkcipher_encrypt_iv(&desc, sg, sg, sizeof(resp->encrypted)); | |
17926a79 DH |
731 | } |
732 | ||
733 | /* | |
734 | * respond to a challenge packet | |
735 | */ | |
736 | static int rxkad_respond_to_challenge(struct rxrpc_connection *conn, | |
737 | struct sk_buff *skb, | |
738 | u32 *_abort_code) | |
739 | { | |
740 | const struct rxrpc_key_payload *payload; | |
741 | struct rxkad_challenge challenge; | |
742 | struct rxkad_response resp | |
743 | __attribute__((aligned(8))); /* must be aligned for crypto */ | |
744 | struct rxrpc_skb_priv *sp; | |
745 | u32 version, nonce, min_level, abort_code; | |
746 | int ret; | |
747 | ||
748 | _enter("{%d,%x}", conn->debug_id, key_serial(conn->key)); | |
749 | ||
750 | if (!conn->key) { | |
751 | _leave(" = -EPROTO [no key]"); | |
752 | return -EPROTO; | |
753 | } | |
754 | ||
755 | ret = key_validate(conn->key); | |
756 | if (ret < 0) { | |
757 | *_abort_code = RXKADEXPIRED; | |
758 | return ret; | |
759 | } | |
760 | ||
761 | abort_code = RXKADPACKETSHORT; | |
762 | sp = rxrpc_skb(skb); | |
763 | if (skb_copy_bits(skb, 0, &challenge, sizeof(challenge)) < 0) | |
764 | goto protocol_error; | |
765 | ||
766 | version = ntohl(challenge.version); | |
767 | nonce = ntohl(challenge.nonce); | |
768 | min_level = ntohl(challenge.min_level); | |
769 | ||
770 | _proto("Rx CHALLENGE %%%u { v=%u n=%u ml=%u }", | |
771 | ntohl(sp->hdr.serial), version, nonce, min_level); | |
772 | ||
773 | abort_code = RXKADINCONSISTENCY; | |
774 | if (version != RXKAD_VERSION) | |
775 | goto protocol_error; | |
776 | ||
777 | abort_code = RXKADLEVELFAIL; | |
778 | if (conn->security_level < min_level) | |
779 | goto protocol_error; | |
780 | ||
781 | payload = conn->key->payload.data; | |
782 | ||
783 | /* build the response packet */ | |
784 | memset(&resp, 0, sizeof(resp)); | |
785 | ||
786 | resp.version = RXKAD_VERSION; | |
787 | resp.encrypted.epoch = conn->epoch; | |
788 | resp.encrypted.cid = conn->cid; | |
789 | resp.encrypted.securityIndex = htonl(conn->security_ix); | |
790 | resp.encrypted.call_id[0] = | |
791 | (conn->channels[0] ? conn->channels[0]->call_id : 0); | |
792 | resp.encrypted.call_id[1] = | |
793 | (conn->channels[1] ? conn->channels[1]->call_id : 0); | |
794 | resp.encrypted.call_id[2] = | |
795 | (conn->channels[2] ? conn->channels[2]->call_id : 0); | |
796 | resp.encrypted.call_id[3] = | |
797 | (conn->channels[3] ? conn->channels[3]->call_id : 0); | |
798 | resp.encrypted.inc_nonce = htonl(nonce + 1); | |
799 | resp.encrypted.level = htonl(conn->security_level); | |
800 | resp.kvno = htonl(payload->k.kvno); | |
801 | resp.ticket_len = htonl(payload->k.ticket_len); | |
802 | ||
803 | /* calculate the response checksum and then do the encryption */ | |
804 | rxkad_calc_response_checksum(&resp); | |
805 | rxkad_encrypt_response(conn, &resp, &payload->k); | |
806 | return rxkad_send_response(conn, &sp->hdr, &resp, &payload->k); | |
807 | ||
808 | protocol_error: | |
809 | *_abort_code = abort_code; | |
810 | _leave(" = -EPROTO [%d]", abort_code); | |
811 | return -EPROTO; | |
812 | } | |
813 | ||
814 | /* | |
815 | * decrypt the kerberos IV ticket in the response | |
816 | */ | |
817 | static int rxkad_decrypt_ticket(struct rxrpc_connection *conn, | |
818 | void *ticket, size_t ticket_len, | |
819 | struct rxrpc_crypt *_session_key, | |
820 | time_t *_expiry, | |
821 | u32 *_abort_code) | |
822 | { | |
823 | struct blkcipher_desc desc; | |
824 | struct rxrpc_crypt iv, key; | |
68e3f5dd | 825 | struct scatterlist sg[1]; |
17926a79 DH |
826 | struct in_addr addr; |
827 | unsigned life; | |
828 | time_t issue, now; | |
829 | bool little_endian; | |
830 | int ret; | |
831 | u8 *p, *q, *name, *end; | |
832 | ||
833 | _enter("{%d},{%x}", conn->debug_id, key_serial(conn->server_key)); | |
834 | ||
835 | *_expiry = 0; | |
836 | ||
837 | ret = key_validate(conn->server_key); | |
838 | if (ret < 0) { | |
839 | switch (ret) { | |
840 | case -EKEYEXPIRED: | |
841 | *_abort_code = RXKADEXPIRED; | |
842 | goto error; | |
843 | default: | |
844 | *_abort_code = RXKADNOAUTH; | |
845 | goto error; | |
846 | } | |
847 | } | |
848 | ||
849 | ASSERT(conn->server_key->payload.data != NULL); | |
850 | ASSERTCMP((unsigned long) ticket & 7UL, ==, 0); | |
851 | ||
852 | memcpy(&iv, &conn->server_key->type_data, sizeof(iv)); | |
853 | ||
854 | desc.tfm = conn->server_key->payload.data; | |
855 | desc.info = iv.x; | |
856 | desc.flags = 0; | |
857 | ||
68e3f5dd HX |
858 | sg_init_one(&sg[0], ticket, ticket_len); |
859 | crypto_blkcipher_decrypt_iv(&desc, sg, sg, ticket_len); | |
17926a79 DH |
860 | |
861 | p = ticket; | |
862 | end = p + ticket_len; | |
863 | ||
864 | #define Z(size) \ | |
865 | ({ \ | |
866 | u8 *__str = p; \ | |
867 | q = memchr(p, 0, end - p); \ | |
868 | if (!q || q - p > (size)) \ | |
869 | goto bad_ticket; \ | |
870 | for (; p < q; p++) \ | |
871 | if (!isprint(*p)) \ | |
872 | goto bad_ticket; \ | |
873 | p++; \ | |
874 | __str; \ | |
875 | }) | |
876 | ||
877 | /* extract the ticket flags */ | |
878 | _debug("KIV FLAGS: %x", *p); | |
879 | little_endian = *p & 1; | |
880 | p++; | |
881 | ||
882 | /* extract the authentication name */ | |
883 | name = Z(ANAME_SZ); | |
884 | _debug("KIV ANAME: %s", name); | |
885 | ||
886 | /* extract the principal's instance */ | |
887 | name = Z(INST_SZ); | |
888 | _debug("KIV INST : %s", name); | |
889 | ||
890 | /* extract the principal's authentication domain */ | |
891 | name = Z(REALM_SZ); | |
892 | _debug("KIV REALM: %s", name); | |
893 | ||
894 | if (end - p < 4 + 8 + 4 + 2) | |
895 | goto bad_ticket; | |
896 | ||
897 | /* get the IPv4 address of the entity that requested the ticket */ | |
898 | memcpy(&addr, p, sizeof(addr)); | |
899 | p += 4; | |
900 | _debug("KIV ADDR : "NIPQUAD_FMT, NIPQUAD(addr)); | |
901 | ||
902 | /* get the session key from the ticket */ | |
903 | memcpy(&key, p, sizeof(key)); | |
904 | p += 8; | |
905 | _debug("KIV KEY : %08x %08x", ntohl(key.n[0]), ntohl(key.n[1])); | |
906 | memcpy(_session_key, &key, sizeof(key)); | |
907 | ||
908 | /* get the ticket's lifetime */ | |
909 | life = *p++ * 5 * 60; | |
910 | _debug("KIV LIFE : %u", life); | |
911 | ||
912 | /* get the issue time of the ticket */ | |
913 | if (little_endian) { | |
914 | __le32 stamp; | |
915 | memcpy(&stamp, p, 4); | |
916 | issue = le32_to_cpu(stamp); | |
917 | } else { | |
918 | __be32 stamp; | |
919 | memcpy(&stamp, p, 4); | |
920 | issue = be32_to_cpu(stamp); | |
921 | } | |
922 | p += 4; | |
2c6b47de | 923 | now = get_seconds(); |
17926a79 DH |
924 | _debug("KIV ISSUE: %lx [%lx]", issue, now); |
925 | ||
926 | /* check the ticket is in date */ | |
927 | if (issue > now) { | |
928 | *_abort_code = RXKADNOAUTH; | |
929 | ret = -EKEYREJECTED; | |
930 | goto error; | |
931 | } | |
932 | ||
933 | if (issue < now - life) { | |
934 | *_abort_code = RXKADEXPIRED; | |
935 | ret = -EKEYEXPIRED; | |
936 | goto error; | |
937 | } | |
938 | ||
939 | *_expiry = issue + life; | |
940 | ||
941 | /* get the service name */ | |
942 | name = Z(SNAME_SZ); | |
943 | _debug("KIV SNAME: %s", name); | |
944 | ||
945 | /* get the service instance name */ | |
946 | name = Z(INST_SZ); | |
947 | _debug("KIV SINST: %s", name); | |
948 | ||
949 | ret = 0; | |
950 | error: | |
951 | _leave(" = %d", ret); | |
952 | return ret; | |
953 | ||
954 | bad_ticket: | |
955 | *_abort_code = RXKADBADTICKET; | |
956 | ret = -EBADMSG; | |
957 | goto error; | |
958 | } | |
959 | ||
960 | /* | |
961 | * decrypt the response packet | |
962 | */ | |
963 | static void rxkad_decrypt_response(struct rxrpc_connection *conn, | |
964 | struct rxkad_response *resp, | |
965 | const struct rxrpc_crypt *session_key) | |
966 | { | |
967 | struct blkcipher_desc desc; | |
68e3f5dd | 968 | struct scatterlist sg[2]; |
17926a79 DH |
969 | struct rxrpc_crypt iv; |
970 | ||
971 | _enter(",,%08x%08x", | |
972 | ntohl(session_key->n[0]), ntohl(session_key->n[1])); | |
973 | ||
974 | ASSERT(rxkad_ci != NULL); | |
975 | ||
976 | mutex_lock(&rxkad_ci_mutex); | |
977 | if (crypto_blkcipher_setkey(rxkad_ci, session_key->x, | |
978 | sizeof(*session_key)) < 0) | |
979 | BUG(); | |
980 | ||
981 | memcpy(&iv, session_key, sizeof(iv)); | |
982 | desc.tfm = rxkad_ci; | |
983 | desc.info = iv.x; | |
984 | desc.flags = 0; | |
985 | ||
68e3f5dd HX |
986 | rxkad_sg_set_buf2(sg, &resp->encrypted, sizeof(resp->encrypted)); |
987 | crypto_blkcipher_decrypt_iv(&desc, sg, sg, sizeof(resp->encrypted)); | |
17926a79 DH |
988 | mutex_unlock(&rxkad_ci_mutex); |
989 | ||
990 | _leave(""); | |
991 | } | |
992 | ||
993 | /* | |
994 | * verify a response | |
995 | */ | |
996 | static int rxkad_verify_response(struct rxrpc_connection *conn, | |
997 | struct sk_buff *skb, | |
998 | u32 *_abort_code) | |
999 | { | |
1000 | struct rxkad_response response | |
1001 | __attribute__((aligned(8))); /* must be aligned for crypto */ | |
1002 | struct rxrpc_skb_priv *sp; | |
1003 | struct rxrpc_crypt session_key; | |
1004 | time_t expiry; | |
1005 | void *ticket; | |
91e916cf AV |
1006 | u32 abort_code, version, kvno, ticket_len, level; |
1007 | __be32 csum; | |
17926a79 DH |
1008 | int ret; |
1009 | ||
1010 | _enter("{%d,%x}", conn->debug_id, key_serial(conn->server_key)); | |
1011 | ||
1012 | abort_code = RXKADPACKETSHORT; | |
1013 | if (skb_copy_bits(skb, 0, &response, sizeof(response)) < 0) | |
1014 | goto protocol_error; | |
1015 | if (!pskb_pull(skb, sizeof(response))) | |
1016 | BUG(); | |
1017 | ||
1018 | version = ntohl(response.version); | |
1019 | ticket_len = ntohl(response.ticket_len); | |
1020 | kvno = ntohl(response.kvno); | |
1021 | sp = rxrpc_skb(skb); | |
1022 | _proto("Rx RESPONSE %%%u { v=%u kv=%u tl=%u }", | |
1023 | ntohl(sp->hdr.serial), version, kvno, ticket_len); | |
1024 | ||
1025 | abort_code = RXKADINCONSISTENCY; | |
1026 | if (version != RXKAD_VERSION) | |
4aa9cb32 | 1027 | goto protocol_error; |
17926a79 DH |
1028 | |
1029 | abort_code = RXKADTICKETLEN; | |
1030 | if (ticket_len < 4 || ticket_len > MAXKRB5TICKETLEN) | |
1031 | goto protocol_error; | |
1032 | ||
1033 | abort_code = RXKADUNKNOWNKEY; | |
1034 | if (kvno >= RXKAD_TKT_TYPE_KERBEROS_V5) | |
1035 | goto protocol_error; | |
1036 | ||
1037 | /* extract the kerberos ticket and decrypt and decode it */ | |
1038 | ticket = kmalloc(ticket_len, GFP_NOFS); | |
1039 | if (!ticket) | |
1040 | return -ENOMEM; | |
1041 | ||
1042 | abort_code = RXKADPACKETSHORT; | |
1043 | if (skb_copy_bits(skb, 0, ticket, ticket_len) < 0) | |
1044 | goto protocol_error_free; | |
1045 | ||
1046 | ret = rxkad_decrypt_ticket(conn, ticket, ticket_len, &session_key, | |
1047 | &expiry, &abort_code); | |
1048 | if (ret < 0) { | |
1049 | *_abort_code = abort_code; | |
1050 | kfree(ticket); | |
1051 | return ret; | |
1052 | } | |
1053 | ||
1054 | /* use the session key from inside the ticket to decrypt the | |
1055 | * response */ | |
1056 | rxkad_decrypt_response(conn, &response, &session_key); | |
1057 | ||
1058 | abort_code = RXKADSEALEDINCON; | |
1059 | if (response.encrypted.epoch != conn->epoch) | |
1060 | goto protocol_error_free; | |
1061 | if (response.encrypted.cid != conn->cid) | |
1062 | goto protocol_error_free; | |
1063 | if (ntohl(response.encrypted.securityIndex) != conn->security_ix) | |
1064 | goto protocol_error_free; | |
1065 | csum = response.encrypted.checksum; | |
1066 | response.encrypted.checksum = 0; | |
1067 | rxkad_calc_response_checksum(&response); | |
1068 | if (response.encrypted.checksum != csum) | |
1069 | goto protocol_error_free; | |
1070 | ||
1071 | if (ntohl(response.encrypted.call_id[0]) > INT_MAX || | |
1072 | ntohl(response.encrypted.call_id[1]) > INT_MAX || | |
1073 | ntohl(response.encrypted.call_id[2]) > INT_MAX || | |
1074 | ntohl(response.encrypted.call_id[3]) > INT_MAX) | |
1075 | goto protocol_error_free; | |
1076 | ||
1077 | abort_code = RXKADOUTOFSEQUENCE; | |
1078 | if (response.encrypted.inc_nonce != htonl(conn->security_nonce + 1)) | |
1079 | goto protocol_error_free; | |
1080 | ||
1081 | abort_code = RXKADLEVELFAIL; | |
1082 | level = ntohl(response.encrypted.level); | |
1083 | if (level > RXRPC_SECURITY_ENCRYPT) | |
1084 | goto protocol_error_free; | |
1085 | conn->security_level = level; | |
1086 | ||
1087 | /* create a key to hold the security data and expiration time - after | |
1088 | * this the connection security can be handled in exactly the same way | |
1089 | * as for a client connection */ | |
1090 | ret = rxrpc_get_server_data_key(conn, &session_key, expiry, kvno); | |
1091 | if (ret < 0) { | |
1092 | kfree(ticket); | |
1093 | return ret; | |
1094 | } | |
1095 | ||
1096 | kfree(ticket); | |
1097 | _leave(" = 0"); | |
1098 | return 0; | |
1099 | ||
1100 | protocol_error_free: | |
1101 | kfree(ticket); | |
1102 | protocol_error: | |
1103 | *_abort_code = abort_code; | |
1104 | _leave(" = -EPROTO [%d]", abort_code); | |
1105 | return -EPROTO; | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * clear the connection security | |
1110 | */ | |
1111 | static void rxkad_clear(struct rxrpc_connection *conn) | |
1112 | { | |
1113 | _enter(""); | |
1114 | ||
1115 | if (conn->cipher) | |
1116 | crypto_free_blkcipher(conn->cipher); | |
1117 | } | |
1118 | ||
1119 | /* | |
1120 | * RxRPC Kerberos-based security | |
1121 | */ | |
1122 | static struct rxrpc_security rxkad = { | |
1123 | .owner = THIS_MODULE, | |
1124 | .name = "rxkad", | |
1125 | .security_index = RXKAD_VERSION, | |
1126 | .init_connection_security = rxkad_init_connection_security, | |
1127 | .prime_packet_security = rxkad_prime_packet_security, | |
1128 | .secure_packet = rxkad_secure_packet, | |
1129 | .verify_packet = rxkad_verify_packet, | |
1130 | .issue_challenge = rxkad_issue_challenge, | |
1131 | .respond_to_challenge = rxkad_respond_to_challenge, | |
1132 | .verify_response = rxkad_verify_response, | |
1133 | .clear = rxkad_clear, | |
1134 | }; | |
1135 | ||
1136 | static __init int rxkad_init(void) | |
1137 | { | |
1138 | _enter(""); | |
1139 | ||
1140 | /* pin the cipher we need so that the crypto layer doesn't invoke | |
1141 | * keventd to go get it */ | |
1142 | rxkad_ci = crypto_alloc_blkcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC); | |
1143 | if (IS_ERR(rxkad_ci)) | |
1144 | return PTR_ERR(rxkad_ci); | |
1145 | ||
1146 | return rxrpc_register_security(&rxkad); | |
1147 | } | |
1148 | ||
1149 | module_init(rxkad_init); | |
1150 | ||
1151 | static __exit void rxkad_exit(void) | |
1152 | { | |
1153 | _enter(""); | |
1154 | ||
1155 | rxrpc_unregister_security(&rxkad); | |
1156 | crypto_free_blkcipher(rxkad_ci); | |
1157 | } | |
1158 | ||
1159 | module_exit(rxkad_exit); |