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[linux-2.6/next.git] / net / rxrpc / ar-key.c
blob5ee16f0353febe4d195daaa6ca29ace62a79c06a
1 /* RxRPC key management
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 * RxRPC keys should have a description of describing their purpose:
12 * "afs@CAMBRIDGE.REDHAT.COM>
13 */
14
15 #include <linux/module.h>
16 #include <linux/net.h>
17 #include <linux/skbuff.h>
18 #include <linux/key-type.h>
19 #include <linux/crypto.h>
20 #include <linux/ctype.h>
21 #include <linux/slab.h>
22 #include <net/sock.h>
23 #include <net/af_rxrpc.h>
24 #include <keys/rxrpc-type.h>
25 #include <keys/user-type.h>
26 #include "ar-internal.h"
27
28 static int rxrpc_instantiate(struct key *, const void *, size_t);
29 static int rxrpc_instantiate_s(struct key *, const void *, size_t);
30 static void rxrpc_destroy(struct key *);
31 static void rxrpc_destroy_s(struct key *);
32 static void rxrpc_describe(const struct key *, struct seq_file *);
33 static long rxrpc_read(const struct key *, char __user *, size_t);
34
35 /*
36 * rxrpc defined keys take an arbitrary string as the description and an
37 * arbitrary blob of data as the payload
38 */
39 struct key_type key_type_rxrpc = {
40 .name = "rxrpc",
41 .instantiate = rxrpc_instantiate,
42 .match = user_match,
43 .destroy = rxrpc_destroy,
44 .describe = rxrpc_describe,
45 .read = rxrpc_read,
46 };
47 EXPORT_SYMBOL(key_type_rxrpc);
48
49 /*
50 * rxrpc server defined keys take "<serviceId>:<securityIndex>" as the
51 * description and an 8-byte decryption key as the payload
52 */
53 struct key_type key_type_rxrpc_s = {
54 .name = "rxrpc_s",
55 .instantiate = rxrpc_instantiate_s,
56 .match = user_match,
57 .destroy = rxrpc_destroy_s,
58 .describe = rxrpc_describe,
59 };
60
61 /*
62 * parse an RxKAD type XDR format token
63 * - the caller guarantees we have at least 4 words
64 */
65 static int rxrpc_instantiate_xdr_rxkad(struct key *key, const __be32 *xdr,
66 unsigned toklen)
67 {
68 struct rxrpc_key_token *token, **pptoken;
69 size_t plen;
70 u32 tktlen;
71 int ret;
72
73 _enter(",{%x,%x,%x,%x},%u",
74 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
75 toklen);
76
77 if (toklen <= 8 * 4)
78 return -EKEYREJECTED;
79 tktlen = ntohl(xdr[7]);
80 _debug("tktlen: %x", tktlen);
81 if (tktlen > AFSTOKEN_RK_TIX_MAX)
82 return -EKEYREJECTED;
83 if (8 * 4 + tktlen != toklen)
84 return -EKEYREJECTED;
85
86 plen = sizeof(*token) + sizeof(*token->kad) + tktlen;
87 ret = key_payload_reserve(key, key->datalen + plen);
88 if (ret < 0)
89 return ret;
90
91 plen -= sizeof(*token);
92 token = kmalloc(sizeof(*token), GFP_KERNEL);
93 if (!token)
94 return -ENOMEM;
95
96 token->kad = kmalloc(plen, GFP_KERNEL);
97 if (!token->kad) {
98 kfree(token);
99 return -ENOMEM;
100 }
101
102 token->security_index = RXRPC_SECURITY_RXKAD;
103 token->kad->ticket_len = tktlen;
104 token->kad->vice_id = ntohl(xdr[0]);
105 token->kad->kvno = ntohl(xdr[1]);
106 token->kad->start = ntohl(xdr[4]);
107 token->kad->expiry = ntohl(xdr[5]);
108 token->kad->primary_flag = ntohl(xdr[6]);
109 memcpy(&token->kad->session_key, &xdr[2], 8);
110 memcpy(&token->kad->ticket, &xdr[8], tktlen);
111
112 _debug("SCIX: %u", token->security_index);
113 _debug("TLEN: %u", token->kad->ticket_len);
114 _debug("EXPY: %x", token->kad->expiry);
115 _debug("KVNO: %u", token->kad->kvno);
116 _debug("PRIM: %u", token->kad->primary_flag);
117 _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
118 token->kad->session_key[0], token->kad->session_key[1],
119 token->kad->session_key[2], token->kad->session_key[3],
120 token->kad->session_key[4], token->kad->session_key[5],
121 token->kad->session_key[6], token->kad->session_key[7]);
122 if (token->kad->ticket_len >= 8)
123 _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
124 token->kad->ticket[0], token->kad->ticket[1],
125 token->kad->ticket[2], token->kad->ticket[3],
126 token->kad->ticket[4], token->kad->ticket[5],
127 token->kad->ticket[6], token->kad->ticket[7]);
128
129 /* count the number of tokens attached */
130 key->type_data.x[0]++;
131
132 /* attach the data */
133 for (pptoken = (struct rxrpc_key_token **)&key->payload.data;
134 *pptoken;
135 pptoken = &(*pptoken)->next)
136 continue;
137 *pptoken = token;
138 if (token->kad->expiry < key->expiry)
139 key->expiry = token->kad->expiry;
140
141 _leave(" = 0");
142 return 0;
143 }
144
145 static void rxrpc_free_krb5_principal(struct krb5_principal *princ)
146 {
147 int loop;
148
149 if (princ->name_parts) {
150 for (loop = princ->n_name_parts - 1; loop >= 0; loop--)
151 kfree(princ->name_parts[loop]);
152 kfree(princ->name_parts);
153 }
154 kfree(princ->realm);
155 }
156
157 static void rxrpc_free_krb5_tagged(struct krb5_tagged_data *td)
158 {
159 kfree(td->data);
160 }
161
162 /*
163 * free up an RxK5 token
164 */
165 static void rxrpc_rxk5_free(struct rxk5_key *rxk5)
166 {
167 int loop;
168
169 rxrpc_free_krb5_principal(&rxk5->client);
170 rxrpc_free_krb5_principal(&rxk5->server);
171 rxrpc_free_krb5_tagged(&rxk5->session);
172
173 if (rxk5->addresses) {
174 for (loop = rxk5->n_addresses - 1; loop >= 0; loop--)
175 rxrpc_free_krb5_tagged(&rxk5->addresses[loop]);
176 kfree(rxk5->addresses);
177 }
178 if (rxk5->authdata) {
179 for (loop = rxk5->n_authdata - 1; loop >= 0; loop--)
180 rxrpc_free_krb5_tagged(&rxk5->authdata[loop]);
181 kfree(rxk5->authdata);
182 }
183
184 kfree(rxk5->ticket);
185 kfree(rxk5->ticket2);
186 kfree(rxk5);
187 }
188
189 /*
190 * extract a krb5 principal
191 */
192 static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,
193 const __be32 **_xdr,
194 unsigned *_toklen)
195 {
196 const __be32 *xdr = *_xdr;
197 unsigned toklen = *_toklen, n_parts, loop, tmp;
198
199 /* there must be at least one name, and at least #names+1 length
200 * words */
201 if (toklen <= 12)
202 return -EINVAL;
203
204 _enter(",{%x,%x,%x},%u",
205 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), toklen);
206
207 n_parts = ntohl(*xdr++);
208 toklen -= 4;
209 if (n_parts <= 0 || n_parts > AFSTOKEN_K5_COMPONENTS_MAX)
210 return -EINVAL;
211 princ->n_name_parts = n_parts;
212
213 if (toklen <= (n_parts + 1) * 4)
214 return -EINVAL;
215
216 princ->name_parts = kcalloc(sizeof(char *), n_parts, GFP_KERNEL);
217 if (!princ->name_parts)
218 return -ENOMEM;
219
220 for (loop = 0; loop < n_parts; loop++) {
221 if (toklen < 4)
222 return -EINVAL;
223 tmp = ntohl(*xdr++);
224 toklen -= 4;
225 if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX)
226 return -EINVAL;
227 if (tmp > toklen)
228 return -EINVAL;
229 princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL);
230 if (!princ->name_parts[loop])
231 return -ENOMEM;
232 memcpy(princ->name_parts[loop], xdr, tmp);
233 princ->name_parts[loop][tmp] = 0;
234 tmp = (tmp + 3) & ~3;
235 toklen -= tmp;
236 xdr += tmp >> 2;
237 }
238
239 if (toklen < 4)
240 return -EINVAL;
241 tmp = ntohl(*xdr++);
242 toklen -= 4;
243 if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX)
244 return -EINVAL;
245 if (tmp > toklen)
246 return -EINVAL;
247 princ->realm = kmalloc(tmp + 1, GFP_KERNEL);
248 if (!princ->realm)
249 return -ENOMEM;
250 memcpy(princ->realm, xdr, tmp);
251 princ->realm[tmp] = 0;
252 tmp = (tmp + 3) & ~3;
253 toklen -= tmp;
254 xdr += tmp >> 2;
255
256 _debug("%s/...@%s", princ->name_parts[0], princ->realm);
257
258 *_xdr = xdr;
259 *_toklen = toklen;
260 _leave(" = 0 [toklen=%u]", toklen);
261 return 0;
262 }
263
264 /*
265 * extract a piece of krb5 tagged data
266 */
267 static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,
268 size_t max_data_size,
269 const __be32 **_xdr,
270 unsigned *_toklen)
271 {
272 const __be32 *xdr = *_xdr;
273 unsigned toklen = *_toklen, len;
274
275 /* there must be at least one tag and one length word */
276 if (toklen <= 8)
277 return -EINVAL;
278
279 _enter(",%zu,{%x,%x},%u",
280 max_data_size, ntohl(xdr[0]), ntohl(xdr[1]), toklen);
281
282 td->tag = ntohl(*xdr++);
283 len = ntohl(*xdr++);
284 toklen -= 8;
285 if (len > max_data_size)
286 return -EINVAL;
287 td->data_len = len;
288
289 if (len > 0) {
290 td->data = kmalloc(len, GFP_KERNEL);
291 if (!td->data)
292 return -ENOMEM;
293 memcpy(td->data, xdr, len);
294 len = (len + 3) & ~3;
295 toklen -= len;
296 xdr += len >> 2;
297 }
298
299 _debug("tag %x len %x", td->tag, td->data_len);
300
301 *_xdr = xdr;
302 *_toklen = toklen;
303 _leave(" = 0 [toklen=%u]", toklen);
304 return 0;
305 }
306
307 /*
308 * extract an array of tagged data
309 */
310 static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td,
311 u8 *_n_elem,
312 u8 max_n_elem,
313 size_t max_elem_size,
314 const __be32 **_xdr,
315 unsigned *_toklen)
316 {
317 struct krb5_tagged_data *td;
318 const __be32 *xdr = *_xdr;
319 unsigned toklen = *_toklen, n_elem, loop;
320 int ret;
321
322 /* there must be at least one count */
323 if (toklen < 4)
324 return -EINVAL;
325
326 _enter(",,%u,%zu,{%x},%u",
327 max_n_elem, max_elem_size, ntohl(xdr[0]), toklen);
328
329 n_elem = ntohl(*xdr++);
330 toklen -= 4;
331 if (n_elem < 0 || n_elem > max_n_elem)
332 return -EINVAL;
333 *_n_elem = n_elem;
334 if (n_elem > 0) {
335 if (toklen <= (n_elem + 1) * 4)
336 return -EINVAL;
337
338 _debug("n_elem %d", n_elem);
339
340 td = kcalloc(sizeof(struct krb5_tagged_data), n_elem,
341 GFP_KERNEL);
342 if (!td)
343 return -ENOMEM;
344 *_td = td;
345
346 for (loop = 0; loop < n_elem; loop++) {
347 ret = rxrpc_krb5_decode_tagged_data(&td[loop],
348 max_elem_size,
349 &xdr, &toklen);
350 if (ret < 0)
351 return ret;
352 }
353 }
354
355 *_xdr = xdr;
356 *_toklen = toklen;
357 _leave(" = 0 [toklen=%u]", toklen);
358 return 0;
359 }
360
361 /*
362 * extract a krb5 ticket
363 */
364 static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
365 const __be32 **_xdr, unsigned *_toklen)
366 {
367 const __be32 *xdr = *_xdr;
368 unsigned toklen = *_toklen, len;
369
370 /* there must be at least one length word */
371 if (toklen <= 4)
372 return -EINVAL;
373
374 _enter(",{%x},%u", ntohl(xdr[0]), toklen);
375
376 len = ntohl(*xdr++);
377 toklen -= 4;
378 if (len > AFSTOKEN_K5_TIX_MAX)
379 return -EINVAL;
380 *_tktlen = len;
381
382 _debug("ticket len %u", len);
383
384 if (len > 0) {
385 *_ticket = kmalloc(len, GFP_KERNEL);
386 if (!*_ticket)
387 return -ENOMEM;
388 memcpy(*_ticket, xdr, len);
389 len = (len + 3) & ~3;
390 toklen -= len;
391 xdr += len >> 2;
392 }
393
394 *_xdr = xdr;
395 *_toklen = toklen;
396 _leave(" = 0 [toklen=%u]", toklen);
397 return 0;
398 }
399
400 /*
401 * parse an RxK5 type XDR format token
402 * - the caller guarantees we have at least 4 words
403 */
404 static int rxrpc_instantiate_xdr_rxk5(struct key *key, const __be32 *xdr,
405 unsigned toklen)
406 {
407 struct rxrpc_key_token *token, **pptoken;
408 struct rxk5_key *rxk5;
409 const __be32 *end_xdr = xdr + (toklen >> 2);
410 int ret;
411
412 _enter(",{%x,%x,%x,%x},%u",
413 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
414 toklen);
415
416 /* reserve some payload space for this subkey - the length of the token
417 * is a reasonable approximation */
418 ret = key_payload_reserve(key, key->datalen + toklen);
419 if (ret < 0)
420 return ret;
421
422 token = kzalloc(sizeof(*token), GFP_KERNEL);
423 if (!token)
424 return -ENOMEM;
425
426 rxk5 = kzalloc(sizeof(*rxk5), GFP_KERNEL);
427 if (!rxk5) {
428 kfree(token);
429 return -ENOMEM;
430 }
431
432 token->security_index = RXRPC_SECURITY_RXK5;
433 token->k5 = rxk5;
434
435 /* extract the principals */
436 ret = rxrpc_krb5_decode_principal(&rxk5->client, &xdr, &toklen);
437 if (ret < 0)
438 goto error;
439 ret = rxrpc_krb5_decode_principal(&rxk5->server, &xdr, &toklen);
440 if (ret < 0)
441 goto error;
442
443 /* extract the session key and the encoding type (the tag field ->
444 * ENCTYPE_xxx) */
445 ret = rxrpc_krb5_decode_tagged_data(&rxk5->session, AFSTOKEN_DATA_MAX,
446 &xdr, &toklen);
447 if (ret < 0)
448 goto error;
449
450 if (toklen < 4 * 8 + 2 * 4)
451 goto inval;
452 rxk5->authtime = be64_to_cpup((const __be64 *) xdr);
453 xdr += 2;
454 rxk5->starttime = be64_to_cpup((const __be64 *) xdr);
455 xdr += 2;
456 rxk5->endtime = be64_to_cpup((const __be64 *) xdr);
457 xdr += 2;
458 rxk5->renew_till = be64_to_cpup((const __be64 *) xdr);
459 xdr += 2;
460 rxk5->is_skey = ntohl(*xdr++);
461 rxk5->flags = ntohl(*xdr++);
462 toklen -= 4 * 8 + 2 * 4;
463
464 _debug("times: a=%llx s=%llx e=%llx rt=%llx",
465 rxk5->authtime, rxk5->starttime, rxk5->endtime,
466 rxk5->renew_till);
467 _debug("is_skey=%x flags=%x", rxk5->is_skey, rxk5->flags);
468
469 /* extract the permitted client addresses */
470 ret = rxrpc_krb5_decode_tagged_array(&rxk5->addresses,
471 &rxk5->n_addresses,
472 AFSTOKEN_K5_ADDRESSES_MAX,
473 AFSTOKEN_DATA_MAX,
474 &xdr, &toklen);
475 if (ret < 0)
476 goto error;
477
478 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
479
480 /* extract the tickets */
481 ret = rxrpc_krb5_decode_ticket(&rxk5->ticket, &rxk5->ticket_len,
482 &xdr, &toklen);
483 if (ret < 0)
484 goto error;
485 ret = rxrpc_krb5_decode_ticket(&rxk5->ticket2, &rxk5->ticket2_len,
486 &xdr, &toklen);
487 if (ret < 0)
488 goto error;
489
490 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
491
492 /* extract the typed auth data */
493 ret = rxrpc_krb5_decode_tagged_array(&rxk5->authdata,
494 &rxk5->n_authdata,
495 AFSTOKEN_K5_AUTHDATA_MAX,
496 AFSTOKEN_BDATALN_MAX,
497 &xdr, &toklen);
498 if (ret < 0)
499 goto error;
500
501 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
502
503 if (toklen != 0)
504 goto inval;
505
506 /* attach the payload to the key */
507 for (pptoken = (struct rxrpc_key_token **)&key->payload.data;
508 *pptoken;
509 pptoken = &(*pptoken)->next)
510 continue;
511 *pptoken = token;
512 if (token->kad->expiry < key->expiry)
513 key->expiry = token->kad->expiry;
514
515 _leave(" = 0");
516 return 0;
517
518 inval:
519 ret = -EINVAL;
520 error:
521 rxrpc_rxk5_free(rxk5);
522 kfree(token);
523 _leave(" = %d", ret);
524 return ret;
525 }
526
527 /*
528 * attempt to parse the data as the XDR format
529 * - the caller guarantees we have more than 7 words
530 */
531 static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datalen)
532 {
533 const __be32 *xdr = data, *token;
534 const char *cp;
535 unsigned len, tmp, loop, ntoken, toklen, sec_ix;
536 int ret;
537
538 _enter(",{%x,%x,%x,%x},%zu",
539 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
540 datalen);
541
542 if (datalen > AFSTOKEN_LENGTH_MAX)
543 goto not_xdr;
544
545 /* XDR is an array of __be32's */
546 if (datalen & 3)
547 goto not_xdr;
548
549 /* the flags should be 0 (the setpag bit must be handled by
550 * userspace) */
551 if (ntohl(*xdr++) != 0)
552 goto not_xdr;
553 datalen -= 4;
554
555 /* check the cell name */
556 len = ntohl(*xdr++);
557 if (len < 1 || len > AFSTOKEN_CELL_MAX)
558 goto not_xdr;
559 datalen -= 4;
560 tmp = (len + 3) & ~3;
561 if (tmp > datalen)
562 goto not_xdr;
563
564 cp = (const char *) xdr;
565 for (loop = 0; loop < len; loop++)
566 if (!isprint(cp[loop]))
567 goto not_xdr;
568 if (len < tmp)
569 for (; loop < tmp; loop++)
570 if (cp[loop])
571 goto not_xdr;
572 _debug("cellname: [%u/%u] '%*.*s'",
573 len, tmp, len, len, (const char *) xdr);
574 datalen -= tmp;
575 xdr += tmp >> 2;
576
577 /* get the token count */
578 if (datalen < 12)
579 goto not_xdr;
580 ntoken = ntohl(*xdr++);
581 datalen -= 4;
582 _debug("ntoken: %x", ntoken);
583 if (ntoken < 1 || ntoken > AFSTOKEN_MAX)
584 goto not_xdr;
585
586 /* check each token wrapper */
587 token = xdr;
588 loop = ntoken;
589 do {
590 if (datalen < 8)
591 goto not_xdr;
592 toklen = ntohl(*xdr++);
593 sec_ix = ntohl(*xdr);
594 datalen -= 4;
595 _debug("token: [%x/%zx] %x", toklen, datalen, sec_ix);
596 if (toklen < 20 || toklen > datalen)
597 goto not_xdr;
598 datalen -= (toklen + 3) & ~3;
599 xdr += (toklen + 3) >> 2;
600
601 } while (--loop > 0);
602
603 _debug("remainder: %zu", datalen);
604 if (datalen != 0)
605 goto not_xdr;
606
607 /* okay: we're going to assume it's valid XDR format
608 * - we ignore the cellname, relying on the key to be correctly named
609 */
610 do {
611 xdr = token;
612 toklen = ntohl(*xdr++);
613 token = xdr + ((toklen + 3) >> 2);
614 sec_ix = ntohl(*xdr++);
615 toklen -= 4;
616
617 _debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token);
618
619 switch (sec_ix) {
620 case RXRPC_SECURITY_RXKAD:
621 ret = rxrpc_instantiate_xdr_rxkad(key, xdr, toklen);
622 if (ret != 0)
623 goto error;
624 break;
625
626 case RXRPC_SECURITY_RXK5:
627 ret = rxrpc_instantiate_xdr_rxk5(key, xdr, toklen);
628 if (ret != 0)
629 goto error;
630 break;
631
632 default:
633 ret = -EPROTONOSUPPORT;
634 goto error;
635 }
636
637 } while (--ntoken > 0);
638
639 _leave(" = 0");
640 return 0;
641
642 not_xdr:
643 _leave(" = -EPROTO");
644 return -EPROTO;
645 error:
646 _leave(" = %d", ret);
647 return ret;
648 }
649
650 /*
651 * instantiate an rxrpc defined key
652 * data should be of the form:
653 * OFFSET LEN CONTENT
654 * 0 4 key interface version number
655 * 4 2 security index (type)
656 * 6 2 ticket length
657 * 8 4 key expiry time (time_t)
658 * 12 4 kvno
659 * 16 8 session key
660 * 24 [len] ticket
661 *
662 * if no data is provided, then a no-security key is made
663 */
664 static int rxrpc_instantiate(struct key *key, const void *data, size_t datalen)
665 {
666 const struct rxrpc_key_data_v1 *v1;
667 struct rxrpc_key_token *token, **pp;
668 size_t plen;
669 u32 kver;
670 int ret;
671
672 _enter("{%x},,%zu", key_serial(key), datalen);
673
674 /* handle a no-security key */
675 if (!data && datalen == 0)
676 return 0;
677
678 /* determine if the XDR payload format is being used */
679 if (datalen > 7 * 4) {
680 ret = rxrpc_instantiate_xdr(key, data, datalen);
681 if (ret != -EPROTO)
682 return ret;
683 }
684
685 /* get the key interface version number */
686 ret = -EINVAL;
687 if (datalen <= 4 || !data)
688 goto error;
689 memcpy(&kver, data, sizeof(kver));
690 data += sizeof(kver);
691 datalen -= sizeof(kver);
692
693 _debug("KEY I/F VERSION: %u", kver);
694
695 ret = -EKEYREJECTED;
696 if (kver != 1)
697 goto error;
698
699 /* deal with a version 1 key */
700 ret = -EINVAL;
701 if (datalen < sizeof(*v1))
702 goto error;
703
704 v1 = data;
705 if (datalen != sizeof(*v1) + v1->ticket_length)
706 goto error;
707
708 _debug("SCIX: %u", v1->security_index);
709 _debug("TLEN: %u", v1->ticket_length);
710 _debug("EXPY: %x", v1->expiry);
711 _debug("KVNO: %u", v1->kvno);
712 _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
713 v1->session_key[0], v1->session_key[1],
714 v1->session_key[2], v1->session_key[3],
715 v1->session_key[4], v1->session_key[5],
716 v1->session_key[6], v1->session_key[7]);
717 if (v1->ticket_length >= 8)
718 _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
719 v1->ticket[0], v1->ticket[1],
720 v1->ticket[2], v1->ticket[3],
721 v1->ticket[4], v1->ticket[5],
722 v1->ticket[6], v1->ticket[7]);
723
724 ret = -EPROTONOSUPPORT;
725 if (v1->security_index != RXRPC_SECURITY_RXKAD)
726 goto error;
727
728 plen = sizeof(*token->kad) + v1->ticket_length;
729 ret = key_payload_reserve(key, plen + sizeof(*token));
730 if (ret < 0)
731 goto error;
732
733 ret = -ENOMEM;
734 token = kmalloc(sizeof(*token), GFP_KERNEL);
735 if (!token)
736 goto error;
737 token->kad = kmalloc(plen, GFP_KERNEL);
738 if (!token->kad)
739 goto error_free;
740
741 token->security_index = RXRPC_SECURITY_RXKAD;
742 token->kad->ticket_len = v1->ticket_length;
743 token->kad->expiry = v1->expiry;
744 token->kad->kvno = v1->kvno;
745 memcpy(&token->kad->session_key, &v1->session_key, 8);
746 memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length);
747
748 /* attach the data */
749 key->type_data.x[0]++;
750
751 pp = (struct rxrpc_key_token **)&key->payload.data;
752 while (*pp)
753 pp = &(*pp)->next;
754 *pp = token;
755 if (token->kad->expiry < key->expiry)
756 key->expiry = token->kad->expiry;
757 token = NULL;
758 ret = 0;
759
760 error_free:
761 kfree(token);
762 error:
763 return ret;
764 }
765
766 /*
767 * instantiate a server secret key
768 * data should be a pointer to the 8-byte secret key
769 */
770 static int rxrpc_instantiate_s(struct key *key, const void *data,
771 size_t datalen)
772 {
773 struct crypto_blkcipher *ci;
774
775 _enter("{%x},,%zu", key_serial(key), datalen);
776
777 if (datalen != 8)
778 return -EINVAL;
779
780 memcpy(&key->type_data, data, 8);
781
782 ci = crypto_alloc_blkcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC);
783 if (IS_ERR(ci)) {
784 _leave(" = %ld", PTR_ERR(ci));
785 return PTR_ERR(ci);
786 }
787
788 if (crypto_blkcipher_setkey(ci, data, 8) < 0)
789 BUG();
790
791 key->payload.data = ci;
792 _leave(" = 0");
793 return 0;
794 }
795
796 /*
797 * dispose of the data dangling from the corpse of a rxrpc key
798 */
799 static void rxrpc_destroy(struct key *key)
800 {
801 struct rxrpc_key_token *token;
802
803 while ((token = key->payload.data)) {
804 key->payload.data = token->next;
805 switch (token->security_index) {
806 case RXRPC_SECURITY_RXKAD:
807 kfree(token->kad);
808 break;
809 case RXRPC_SECURITY_RXK5:
810 if (token->k5)
811 rxrpc_rxk5_free(token->k5);
812 break;
813 default:
814 printk(KERN_ERR "Unknown token type %x on rxrpc key\n",
815 token->security_index);
816 BUG();
817 }
818
819 kfree(token);
820 }
821 }
822
823 /*
824 * dispose of the data dangling from the corpse of a rxrpc key
825 */
826 static void rxrpc_destroy_s(struct key *key)
827 {
828 if (key->payload.data) {
829 crypto_free_blkcipher(key->payload.data);
830 key->payload.data = NULL;
831 }
832 }
833
834 /*
835 * describe the rxrpc key
836 */
837 static void rxrpc_describe(const struct key *key, struct seq_file *m)
838 {
839 seq_puts(m, key->description);
840 }
841
842 /*
843 * grab the security key for a socket
844 */
845 int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
846 {
847 struct key *key;
848 char *description;
849
850 _enter("");
851
852 if (optlen <= 0 || optlen > PAGE_SIZE - 1)
853 return -EINVAL;
854
855 description = kmalloc(optlen + 1, GFP_KERNEL);
856 if (!description)
857 return -ENOMEM;
858
859 if (copy_from_user(description, optval, optlen)) {
860 kfree(description);
861 return -EFAULT;
862 }
863 description[optlen] = 0;
864
865 key = request_key(&key_type_rxrpc, description, NULL);
866 if (IS_ERR(key)) {
867 kfree(description);
868 _leave(" = %ld", PTR_ERR(key));
869 return PTR_ERR(key);
870 }
871
872 rx->key = key;
873 kfree(description);
874 _leave(" = 0 [key %x]", key->serial);
875 return 0;
876 }
877
878 /*
879 * grab the security keyring for a server socket
880 */
881 int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval,
882 int optlen)
883 {
884 struct key *key;
885 char *description;
886
887 _enter("");
888
889 if (optlen <= 0 || optlen > PAGE_SIZE - 1)
890 return -EINVAL;
891
892 description = kmalloc(optlen + 1, GFP_KERNEL);
893 if (!description)
894 return -ENOMEM;
895
896 if (copy_from_user(description, optval, optlen)) {
897 kfree(description);
898 return -EFAULT;
899 }
900 description[optlen] = 0;
901
902 key = request_key(&key_type_keyring, description, NULL);
903 if (IS_ERR(key)) {
904 kfree(description);
905 _leave(" = %ld", PTR_ERR(key));
906 return PTR_ERR(key);
907 }
908
909 rx->securities = key;
910 kfree(description);
911 _leave(" = 0 [key %x]", key->serial);
912 return 0;
913 }
914
915 /*
916 * generate a server data key
917 */
918 int rxrpc_get_server_data_key(struct rxrpc_connection *conn,
919 const void *session_key,
920 time_t expiry,
921 u32 kvno)
922 {
923 const struct cred *cred = current_cred();
924 struct key *key;
925 int ret;
926
927 struct {
928 u32 kver;
929 struct rxrpc_key_data_v1 v1;
930 } data;
931
932 _enter("");
933
934 key = key_alloc(&key_type_rxrpc, "x", 0, 0, cred, 0,
935 KEY_ALLOC_NOT_IN_QUOTA);
936 if (IS_ERR(key)) {
937 _leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key));
938 return -ENOMEM;
939 }
940
941 _debug("key %d", key_serial(key));
942
943 data.kver = 1;
944 data.v1.security_index = RXRPC_SECURITY_RXKAD;
945 data.v1.ticket_length = 0;
946 data.v1.expiry = expiry;
947 data.v1.kvno = 0;
948
949 memcpy(&data.v1.session_key, session_key, sizeof(data.v1.session_key));
950
951 ret = key_instantiate_and_link(key, &data, sizeof(data), NULL, NULL);
952 if (ret < 0)
953 goto error;
954
955 conn->key = key;
956 _leave(" = 0 [%d]", key_serial(key));
957 return 0;
958
959 error:
960 key_revoke(key);
961 key_put(key);
962 _leave(" = -ENOMEM [ins %d]", ret);
963 return -ENOMEM;
964 }
965 EXPORT_SYMBOL(rxrpc_get_server_data_key);
966
967 /**
968 * rxrpc_get_null_key - Generate a null RxRPC key
969 * @keyname: The name to give the key.
970 *
971 * Generate a null RxRPC key that can be used to indicate anonymous security is
972 * required for a particular domain.
973 */
974 struct key *rxrpc_get_null_key(const char *keyname)
975 {
976 const struct cred *cred = current_cred();
977 struct key *key;
978 int ret;
979
980 key = key_alloc(&key_type_rxrpc, keyname, 0, 0, cred,
981 KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA);
982 if (IS_ERR(key))
983 return key;
984
985 ret = key_instantiate_and_link(key, NULL, 0, NULL, NULL);
986 if (ret < 0) {
987 key_revoke(key);
988 key_put(key);
989 return ERR_PTR(ret);
990 }
991
992 return key;
993 }
994 EXPORT_SYMBOL(rxrpc_get_null_key);
995
996 /*
997 * read the contents of an rxrpc key
998 * - this returns the result in XDR form
999 */
1000 static long rxrpc_read(const struct key *key,
1001 char __user *buffer, size_t buflen)
1002 {
1003 const struct rxrpc_key_token *token;
1004 const struct krb5_principal *princ;
1005 size_t size;
1006 __be32 __user *xdr, *oldxdr;
1007 u32 cnlen, toksize, ntoks, tok, zero;
1008 u16 toksizes[AFSTOKEN_MAX];
1009 int loop;
1010
1011 _enter("");
1012
1013 /* we don't know what form we should return non-AFS keys in */
1014 if (memcmp(key->description, "afs@", 4) != 0)
1015 return -EOPNOTSUPP;
1016 cnlen = strlen(key->description + 4);
1017
1018 #define RND(X) (((X) + 3) & ~3)
1019
1020 /* AFS keys we return in XDR form, so we need to work out the size of
1021 * the XDR */
1022 size = 2 * 4; /* flags, cellname len */
1023 size += RND(cnlen); /* cellname */
1024 size += 1 * 4; /* token count */
1025
1026 ntoks = 0;
1027 for (token = key->payload.data; token; token = token->next) {
1028 toksize = 4; /* sec index */
1029
1030 switch (token->security_index) {
1031 case RXRPC_SECURITY_RXKAD:
1032 toksize += 8 * 4; /* viceid, kvno, key*2, begin,
1033 * end, primary, tktlen */
1034 toksize += RND(token->kad->ticket_len);
1035 break;
1036
1037 case RXRPC_SECURITY_RXK5:
1038 princ = &token->k5->client;
1039 toksize += 4 + princ->n_name_parts * 4;
1040 for (loop = 0; loop < princ->n_name_parts; loop++)
1041 toksize += RND(strlen(princ->name_parts[loop]));
1042 toksize += 4 + RND(strlen(princ->realm));
1043
1044 princ = &token->k5->server;
1045 toksize += 4 + princ->n_name_parts * 4;
1046 for (loop = 0; loop < princ->n_name_parts; loop++)
1047 toksize += RND(strlen(princ->name_parts[loop]));
1048 toksize += 4 + RND(strlen(princ->realm));
1049
1050 toksize += 8 + RND(token->k5->session.data_len);
1051
1052 toksize += 4 * 8 + 2 * 4;
1053
1054 toksize += 4 + token->k5->n_addresses * 8;
1055 for (loop = 0; loop < token->k5->n_addresses; loop++)
1056 toksize += RND(token->k5->addresses[loop].data_len);
1057
1058 toksize += 4 + RND(token->k5->ticket_len);
1059 toksize += 4 + RND(token->k5->ticket2_len);
1060
1061 toksize += 4 + token->k5->n_authdata * 8;
1062 for (loop = 0; loop < token->k5->n_authdata; loop++)
1063 toksize += RND(token->k5->authdata[loop].data_len);
1064 break;
1065
1066 default: /* we have a ticket we can't encode */
1067 BUG();
1068 continue;
1069 }
1070
1071 _debug("token[%u]: toksize=%u", ntoks, toksize);
1072 ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX);
1073
1074 toksizes[ntoks++] = toksize;
1075 size += toksize + 4; /* each token has a length word */
1076 }
1077
1078 #undef RND
1079
1080 if (!buffer || buflen < size)
1081 return size;
1082
1083 xdr = (__be32 __user *) buffer;
1084 zero = 0;
1085 #define ENCODE(x) \
1086 do { \
1087 __be32 y = htonl(x); \
1088 if (put_user(y, xdr++) < 0) \
1089 goto fault; \
1090 } while(0)
1091 #define ENCODE_DATA(l, s) \
1092 do { \
1093 u32 _l = (l); \
1094 ENCODE(l); \
1095 if (copy_to_user(xdr, (s), _l) != 0) \
1096 goto fault; \
1097 if (_l & 3 && \
1098 copy_to_user((u8 *)xdr + _l, &zero, 4 - (_l & 3)) != 0) \
1099 goto fault; \
1100 xdr += (_l + 3) >> 2; \
1101 } while(0)
1102 #define ENCODE64(x) \
1103 do { \
1104 __be64 y = cpu_to_be64(x); \
1105 if (copy_to_user(xdr, &y, 8) != 0) \
1106 goto fault; \
1107 xdr += 8 >> 2; \
1108 } while(0)
1109 #define ENCODE_STR(s) \
1110 do { \
1111 const char *_s = (s); \
1112 ENCODE_DATA(strlen(_s), _s); \
1113 } while(0)
1114
1115 ENCODE(0); /* flags */
1116 ENCODE_DATA(cnlen, key->description + 4); /* cellname */
1117 ENCODE(ntoks);
1118
1119 tok = 0;
1120 for (token = key->payload.data; token; token = token->next) {
1121 toksize = toksizes[tok++];
1122 ENCODE(toksize);
1123 oldxdr = xdr;
1124 ENCODE(token->security_index);
1125
1126 switch (token->security_index) {
1127 case RXRPC_SECURITY_RXKAD:
1128 ENCODE(token->kad->vice_id);
1129 ENCODE(token->kad->kvno);
1130 ENCODE_DATA(8, token->kad->session_key);
1131 ENCODE(token->kad->start);
1132 ENCODE(token->kad->expiry);
1133 ENCODE(token->kad->primary_flag);
1134 ENCODE_DATA(token->kad->ticket_len, token->kad->ticket);
1135 break;
1136
1137 case RXRPC_SECURITY_RXK5:
1138 princ = &token->k5->client;
1139 ENCODE(princ->n_name_parts);
1140 for (loop = 0; loop < princ->n_name_parts; loop++)
1141 ENCODE_STR(princ->name_parts[loop]);
1142 ENCODE_STR(princ->realm);
1143
1144 princ = &token->k5->server;
1145 ENCODE(princ->n_name_parts);
1146 for (loop = 0; loop < princ->n_name_parts; loop++)
1147 ENCODE_STR(princ->name_parts[loop]);
1148 ENCODE_STR(princ->realm);
1149
1150 ENCODE(token->k5->session.tag);
1151 ENCODE_DATA(token->k5->session.data_len,
1152 token->k5->session.data);
1153
1154 ENCODE64(token->k5->authtime);
1155 ENCODE64(token->k5->starttime);
1156 ENCODE64(token->k5->endtime);
1157 ENCODE64(token->k5->renew_till);
1158 ENCODE(token->k5->is_skey);
1159 ENCODE(token->k5->flags);
1160
1161 ENCODE(token->k5->n_addresses);
1162 for (loop = 0; loop < token->k5->n_addresses; loop++) {
1163 ENCODE(token->k5->addresses[loop].tag);
1164 ENCODE_DATA(token->k5->addresses[loop].data_len,
1165 token->k5->addresses[loop].data);
1166 }
1167
1168 ENCODE_DATA(token->k5->ticket_len, token->k5->ticket);
1169 ENCODE_DATA(token->k5->ticket2_len, token->k5->ticket2);
1170
1171 ENCODE(token->k5->n_authdata);
1172 for (loop = 0; loop < token->k5->n_authdata; loop++) {
1173 ENCODE(token->k5->authdata[loop].tag);
1174 ENCODE_DATA(token->k5->authdata[loop].data_len,
1175 token->k5->authdata[loop].data);
1176 }
1177 break;
1178
1179 default:
1180 BUG();
1181 break;
1182 }
1183
1184 ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==,
1185 toksize);
1186 }
1187
1188 #undef ENCODE_STR
1189 #undef ENCODE_DATA
1190 #undef ENCODE64
1191 #undef ENCODE
1192
1193 ASSERTCMP(tok, ==, ntoks);
1194 ASSERTCMP((char __user *) xdr - buffer, ==, size);
1195 _leave(" = %zu", size);
1196 return size;
1197
1198 fault:
1199 _leave(" = -EFAULT");
1200 return -EFAULT;
1201 }
linux-next