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[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / net / rxrpc / ar-key.c
CommitLineData
17926a79
DH		 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>
76181c13 18#include <linux/key-type.h>
17926a79 19#include <linux/crypto.h>
33941284 20#include <linux/ctype.h>
5a0e3ad6 21#include <linux/slab.h>
17926a79
DH		 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
b9fffa38 28static int rxrpc_vet_description_s(const char *);
8a7a3eb4
DH		 29static int rxrpc_preparse(struct key_preparsed_payload *);
30static int rxrpc_preparse_s(struct key_preparsed_payload *);
31static void rxrpc_free_preparse(struct key_preparsed_payload *);
32static void rxrpc_free_preparse_s(struct key_preparsed_payload *);
17926a79
DH		 33static void rxrpc_destroy(struct key *);
34static void rxrpc_destroy_s(struct key *);
35static void rxrpc_describe(const struct key *, struct seq_file *);
ed6dd18b 36static long rxrpc_read(const struct key *, char __user *, size_t);
17926a79
DH		 37
38/*
39 * rxrpc defined keys take an arbitrary string as the description and an
40 * arbitrary blob of data as the payload
41 */
42struct key_type key_type_rxrpc = {
43 .name = "rxrpc",
8a7a3eb4
DH		 44 .preparse = rxrpc_preparse,
45 .free_preparse = rxrpc_free_preparse,
46 .instantiate = generic_key_instantiate,
17926a79
DH		 47 .destroy = rxrpc_destroy,
48 .describe = rxrpc_describe,
ed6dd18b 49 .read = rxrpc_read,
17926a79 50};
17926a79
DH		 51EXPORT_SYMBOL(key_type_rxrpc);
52
53/*
54 * rxrpc server defined keys take "<serviceId>:<securityIndex>" as the
55 * description and an 8-byte decryption key as the payload
56 */
57struct key_type key_type_rxrpc_s = {
58 .name = "rxrpc_s",
b9fffa38 59 .vet_description = rxrpc_vet_description_s,
8a7a3eb4
DH		 60 .preparse = rxrpc_preparse_s,
61 .free_preparse = rxrpc_free_preparse_s,
62 .instantiate = generic_key_instantiate,
17926a79
DH		 63 .destroy = rxrpc_destroy_s,
64 .describe = rxrpc_describe,
65};
66
b9fffa38
DH		 67/*
68 * Vet the description for an RxRPC server key
69 */
70static int rxrpc_vet_description_s(const char *desc)
71{
72 unsigned long num;
73 char *p;
74
75 num = simple_strtoul(desc, &p, 10);
76 if (*p != ':' || num > 65535)
77 return -EINVAL;
78 num = simple_strtoul(p + 1, &p, 10);
79 if (*p || num < 1 || num > 255)
80 return -EINVAL;
81 return 0;
82}
83
33941284
DH		 84/*
85 * parse an RxKAD type XDR format token
86 * - the caller guarantees we have at least 4 words
87 */
8a7a3eb4
DH		 88static int rxrpc_preparse_xdr_rxkad(struct key_preparsed_payload *prep,
89 size_t datalen,
90 const __be32 *xdr, unsigned int toklen)
33941284 91{
99455153 92 struct rxrpc_key_token *token, **pptoken;
33941284
DH		 93 size_t plen;
94 u32 tktlen;
33941284
DH		 95
96 _enter(",{%x,%x,%x,%x},%u",
97 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
98 toklen);
99
100 if (toklen <= 8 * 4)
101 return -EKEYREJECTED;
102 tktlen = ntohl(xdr[7]);
103 _debug("tktlen: %x", tktlen);
104 if (tktlen > AFSTOKEN_RK_TIX_MAX)
105 return -EKEYREJECTED;
fde0133b 106 if (toklen < 8 * 4 + tktlen)
33941284
DH		 107 return -EKEYREJECTED;
108
109 plen = sizeof(*token) + sizeof(*token->kad) + tktlen;
8a7a3eb4 110 prep->quotalen = datalen + plen;
33941284
DH		 111
112 plen -= sizeof(*token);
0a93ea2e 113 token = kzalloc(sizeof(*token), GFP_KERNEL);
33941284
DH		 114 if (!token)
115 return -ENOMEM;
116
0a93ea2e 117 token->kad = kzalloc(plen, GFP_KERNEL);
33941284
DH		 118 if (!token->kad) {
119 kfree(token);
120 return -ENOMEM;
121 }
122
123 token->security_index = RXRPC_SECURITY_RXKAD;
124 token->kad->ticket_len = tktlen;
125 token->kad->vice_id = ntohl(xdr[0]);
126 token->kad->kvno = ntohl(xdr[1]);
127 token->kad->start = ntohl(xdr[4]);
128 token->kad->expiry = ntohl(xdr[5]);
129 token->kad->primary_flag = ntohl(xdr[6]);
130 memcpy(&token->kad->session_key, &xdr[2], 8);
131 memcpy(&token->kad->ticket, &xdr[8], tktlen);
132
133 _debug("SCIX: %u", token->security_index);
134 _debug("TLEN: %u", token->kad->ticket_len);
135 _debug("EXPY: %x", token->kad->expiry);
136 _debug("KVNO: %u", token->kad->kvno);
137 _debug("PRIM: %u", token->kad->primary_flag);
138 _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
139 token->kad->session_key[0], token->kad->session_key[1],
140 token->kad->session_key[2], token->kad->session_key[3],
141 token->kad->session_key[4], token->kad->session_key[5],
142 token->kad->session_key[6], token->kad->session_key[7]);
143 if (token->kad->ticket_len >= 8)
144 _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
145 token->kad->ticket[0], token->kad->ticket[1],
146 token->kad->ticket[2], token->kad->ticket[3],
147 token->kad->ticket[4], token->kad->ticket[5],
148 token->kad->ticket[6], token->kad->ticket[7]);
149
150 /* count the number of tokens attached */
146aa8b1 151 prep->payload.data[1] = (void *)((unsigned long)prep->payload.data[1] + 1);
33941284
DH		 152
153 /* attach the data */
146aa8b1 154 for (pptoken = (struct rxrpc_key_token **)&prep->payload.data[0];
99455153
DH		 155 *pptoken;
156 pptoken = &(*pptoken)->next)
157 continue;
158 *pptoken = token;
8a7a3eb4
DH		 159 if (token->kad->expiry < prep->expiry)
160 prep->expiry = token->kad->expiry;
99455153
DH		 161
162 _leave(" = 0");
163 return 0;
164}
165
166static void rxrpc_free_krb5_principal(struct krb5_principal *princ)
167{
168 int loop;
169
170 if (princ->name_parts) {
171 for (loop = princ->n_name_parts - 1; loop >= 0; loop--)
172 kfree(princ->name_parts[loop]);
173 kfree(princ->name_parts);
174 }
175 kfree(princ->realm);
176}
177
178static void rxrpc_free_krb5_tagged(struct krb5_tagged_data *td)
179{
180 kfree(td->data);
181}
182
183/*
184 * free up an RxK5 token
185 */
186static void rxrpc_rxk5_free(struct rxk5_key *rxk5)
187{
188 int loop;
189
190 rxrpc_free_krb5_principal(&rxk5->client);
191 rxrpc_free_krb5_principal(&rxk5->server);
192 rxrpc_free_krb5_tagged(&rxk5->session);
193
194 if (rxk5->addresses) {
195 for (loop = rxk5->n_addresses - 1; loop >= 0; loop--)
196 rxrpc_free_krb5_tagged(&rxk5->addresses[loop]);
197 kfree(rxk5->addresses);
198 }
199 if (rxk5->authdata) {
200 for (loop = rxk5->n_authdata - 1; loop >= 0; loop--)
201 rxrpc_free_krb5_tagged(&rxk5->authdata[loop]);
202 kfree(rxk5->authdata);
203 }
204
205 kfree(rxk5->ticket);
206 kfree(rxk5->ticket2);
207 kfree(rxk5);
208}
209
210/*
211 * extract a krb5 principal
212 */
213static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,
214 const __be32 **_xdr,
95c96174 215 unsigned int *_toklen)
99455153
DH		 216{
217 const __be32 *xdr = *_xdr;
eab38dfd 218 unsigned int toklen = *_toklen, n_parts, loop, tmp, paddedlen;
99455153
DH		 219
220 /* there must be at least one name, and at least #names+1 length
221 * words */
222 if (toklen <= 12)
223 return -EINVAL;
224
225 _enter(",{%x,%x,%x},%u",
226 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), toklen);
227
228 n_parts = ntohl(*xdr++);
229 toklen -= 4;
230 if (n_parts <= 0 || n_parts > AFSTOKEN_K5_COMPONENTS_MAX)
231 return -EINVAL;
232 princ->n_name_parts = n_parts;
233
234 if (toklen <= (n_parts + 1) * 4)
235 return -EINVAL;
236
f65bd5ec 237 princ->name_parts = kcalloc(n_parts, sizeof(char *), GFP_KERNEL);
99455153
DH		 238 if (!princ->name_parts)
239 return -ENOMEM;
240
241 for (loop = 0; loop < n_parts; loop++) {
242 if (toklen < 4)
243 return -EINVAL;
244 tmp = ntohl(*xdr++);
245 toklen -= 4;
246 if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX)
247 return -EINVAL;
eab38dfd
DH		 248 paddedlen = (tmp + 3) & ~3;
249 if (paddedlen > toklen)
99455153
DH		 250 return -EINVAL;
251 princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL);
252 if (!princ->name_parts[loop])
253 return -ENOMEM;
254 memcpy(princ->name_parts[loop], xdr, tmp);
255 princ->name_parts[loop][tmp] = 0;
eab38dfd
DH		 256 toklen -= paddedlen;
257 xdr += paddedlen >> 2;
99455153
DH		 258 }
259
260 if (toklen < 4)
261 return -EINVAL;
262 tmp = ntohl(*xdr++);
263 toklen -= 4;
264 if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX)
265 return -EINVAL;
eab38dfd
DH		 266 paddedlen = (tmp + 3) & ~3;
267 if (paddedlen > toklen)
99455153
DH		 268 return -EINVAL;
269 princ->realm = kmalloc(tmp + 1, GFP_KERNEL);
270 if (!princ->realm)
271 return -ENOMEM;
272 memcpy(princ->realm, xdr, tmp);
273 princ->realm[tmp] = 0;
eab38dfd
DH		 274 toklen -= paddedlen;
275 xdr += paddedlen >> 2;
99455153
DH		 276
277 _debug("%s/...@%s", princ->name_parts[0], princ->realm);
278
279 *_xdr = xdr;
280 *_toklen = toklen;
281 _leave(" = 0 [toklen=%u]", toklen);
282 return 0;
283}
284
285/*
286 * extract a piece of krb5 tagged data
287 */
288static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,
289 size_t max_data_size,
290 const __be32 **_xdr,
95c96174 291 unsigned int *_toklen)
99455153
DH		 292{
293 const __be32 *xdr = *_xdr;
eab38dfd 294 unsigned int toklen = *_toklen, len, paddedlen;
99455153
DH		 295
296 /* there must be at least one tag and one length word */
297 if (toklen <= 8)
298 return -EINVAL;
299
300 _enter(",%zu,{%x,%x},%u",
301 max_data_size, ntohl(xdr[0]), ntohl(xdr[1]), toklen);
302
303 td->tag = ntohl(*xdr++);
304 len = ntohl(*xdr++);
305 toklen -= 8;
306 if (len > max_data_size)
307 return -EINVAL;
eab38dfd
DH		 308 paddedlen = (len + 3) & ~3;
309 if (paddedlen > toklen)
310 return -EINVAL;
99455153
DH		 311 td->data_len = len;
312
313 if (len > 0) {
65d9d2ca 314 td->data = kmemdup(xdr, len, GFP_KERNEL);
99455153
DH		 315 if (!td->data)
316 return -ENOMEM;
eab38dfd
DH		 317 toklen -= paddedlen;
318 xdr += paddedlen >> 2;
99455153
DH		 319 }
320
321 _debug("tag %x len %x", td->tag, td->data_len);
322
323 *_xdr = xdr;
324 *_toklen = toklen;
325 _leave(" = 0 [toklen=%u]", toklen);
326 return 0;
327}
328
329/*
330 * extract an array of tagged data
331 */
332static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td,
333 u8 *_n_elem,
334 u8 max_n_elem,
335 size_t max_elem_size,
336 const __be32 **_xdr,
95c96174 337 unsigned int *_toklen)
99455153
DH		 338{
339 struct krb5_tagged_data *td;
340 const __be32 *xdr = *_xdr;
95c96174 341 unsigned int toklen = *_toklen, n_elem, loop;
99455153
DH		 342 int ret;
343
344 /* there must be at least one count */
345 if (toklen < 4)
346 return -EINVAL;
347
348 _enter(",,%u,%zu,{%x},%u",
349 max_n_elem, max_elem_size, ntohl(xdr[0]), toklen);
350
351 n_elem = ntohl(*xdr++);
352 toklen -= 4;
fa4eff44 353 if (n_elem > max_n_elem)
99455153
DH		 354 return -EINVAL;
355 *_n_elem = n_elem;
356 if (n_elem > 0) {
357 if (toklen <= (n_elem + 1) * 4)
358 return -EINVAL;
359
360 _debug("n_elem %d", n_elem);
361
f65bd5ec 362 td = kcalloc(n_elem, sizeof(struct krb5_tagged_data),
99455153
DH		 363 GFP_KERNEL);
364 if (!td)
365 return -ENOMEM;
366 *_td = td;
367
368 for (loop = 0; loop < n_elem; loop++) {
369 ret = rxrpc_krb5_decode_tagged_data(&td[loop],
370 max_elem_size,
371 &xdr, &toklen);
372 if (ret < 0)
373 return ret;
374 }
375 }
376
377 *_xdr = xdr;
378 *_toklen = toklen;
379 _leave(" = 0 [toklen=%u]", toklen);
380 return 0;
381}
382
383/*
384 * extract a krb5 ticket
385 */
4e36a95e 386static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
95c96174 387 const __be32 **_xdr, unsigned int *_toklen)
99455153
DH		 388{
389 const __be32 *xdr = *_xdr;
eab38dfd 390 unsigned int toklen = *_toklen, len, paddedlen;
99455153
DH		 391
392 /* there must be at least one length word */
393 if (toklen <= 4)
394 return -EINVAL;
395
396 _enter(",{%x},%u", ntohl(xdr[0]), toklen);
397
398 len = ntohl(*xdr++);
399 toklen -= 4;
400 if (len > AFSTOKEN_K5_TIX_MAX)
401 return -EINVAL;
eab38dfd
DH		 402 paddedlen = (len + 3) & ~3;
403 if (paddedlen > toklen)
404 return -EINVAL;
99455153
DH		 405 *_tktlen = len;
406
407 _debug("ticket len %u", len);
408
409 if (len > 0) {
65d9d2ca 410 *_ticket = kmemdup(xdr, len, GFP_KERNEL);
99455153
DH		 411 if (!*_ticket)
412 return -ENOMEM;
eab38dfd
DH		 413 toklen -= paddedlen;
414 xdr += paddedlen >> 2;
99455153
DH		 415 }
416
417 *_xdr = xdr;
418 *_toklen = toklen;
419 _leave(" = 0 [toklen=%u]", toklen);
420 return 0;
421}
422
423/*
424 * parse an RxK5 type XDR format token
425 * - the caller guarantees we have at least 4 words
426 */
8a7a3eb4
DH		 427static int rxrpc_preparse_xdr_rxk5(struct key_preparsed_payload *prep,
428 size_t datalen,
429 const __be32 *xdr, unsigned int toklen)
99455153
DH		 430{
431 struct rxrpc_key_token *token, **pptoken;
432 struct rxk5_key *rxk5;
433 const __be32 *end_xdr = xdr + (toklen >> 2);
434 int ret;
435
436 _enter(",{%x,%x,%x,%x},%u",
437 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
438 toklen);
439
440 /* reserve some payload space for this subkey - the length of the token
441 * is a reasonable approximation */
8a7a3eb4 442 prep->quotalen = datalen + toklen;
99455153
DH		 443
444 token = kzalloc(sizeof(*token), GFP_KERNEL);
445 if (!token)
446 return -ENOMEM;
447
448 rxk5 = kzalloc(sizeof(*rxk5), GFP_KERNEL);
449 if (!rxk5) {
450 kfree(token);
451 return -ENOMEM;
452 }
453
454 token->security_index = RXRPC_SECURITY_RXK5;
455 token->k5 = rxk5;
456
457 /* extract the principals */
458 ret = rxrpc_krb5_decode_principal(&rxk5->client, &xdr, &toklen);
459 if (ret < 0)
460 goto error;
461 ret = rxrpc_krb5_decode_principal(&rxk5->server, &xdr, &toklen);
462 if (ret < 0)
463 goto error;
464
465 /* extract the session key and the encoding type (the tag field ->
466 * ENCTYPE_xxx) */
467 ret = rxrpc_krb5_decode_tagged_data(&rxk5->session, AFSTOKEN_DATA_MAX,
468 &xdr, &toklen);
469 if (ret < 0)
470 goto error;
471
472 if (toklen < 4 * 8 + 2 * 4)
473 goto inval;
474 rxk5->authtime = be64_to_cpup((const __be64 *) xdr);
475 xdr += 2;
476 rxk5->starttime = be64_to_cpup((const __be64 *) xdr);
477 xdr += 2;
478 rxk5->endtime = be64_to_cpup((const __be64 *) xdr);
479 xdr += 2;
480 rxk5->renew_till = be64_to_cpup((const __be64 *) xdr);
481 xdr += 2;
482 rxk5->is_skey = ntohl(*xdr++);
483 rxk5->flags = ntohl(*xdr++);
484 toklen -= 4 * 8 + 2 * 4;
485
486 _debug("times: a=%llx s=%llx e=%llx rt=%llx",
487 rxk5->authtime, rxk5->starttime, rxk5->endtime,
488 rxk5->renew_till);
489 _debug("is_skey=%x flags=%x", rxk5->is_skey, rxk5->flags);
490
491 /* extract the permitted client addresses */
492 ret = rxrpc_krb5_decode_tagged_array(&rxk5->addresses,
493 &rxk5->n_addresses,
494 AFSTOKEN_K5_ADDRESSES_MAX,
495 AFSTOKEN_DATA_MAX,
496 &xdr, &toklen);
497 if (ret < 0)
498 goto error;
499
500 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
501
502 /* extract the tickets */
503 ret = rxrpc_krb5_decode_ticket(&rxk5->ticket, &rxk5->ticket_len,
504 &xdr, &toklen);
505 if (ret < 0)
506 goto error;
507 ret = rxrpc_krb5_decode_ticket(&rxk5->ticket2, &rxk5->ticket2_len,
508 &xdr, &toklen);
509 if (ret < 0)
510 goto error;
511
512 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
513
514 /* extract the typed auth data */
515 ret = rxrpc_krb5_decode_tagged_array(&rxk5->authdata,
516 &rxk5->n_authdata,
517 AFSTOKEN_K5_AUTHDATA_MAX,
518 AFSTOKEN_BDATALN_MAX,
519 &xdr, &toklen);
520 if (ret < 0)
521 goto error;
522
523 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
524
525 if (toklen != 0)
526 goto inval;
527
8a7a3eb4 528 /* attach the payload */
146aa8b1 529 for (pptoken = (struct rxrpc_key_token **)&prep->payload.data[0];
99455153
DH		 530 *pptoken;
531 pptoken = &(*pptoken)->next)
532 continue;
533 *pptoken = token;
8a7a3eb4
DH		 534 if (token->kad->expiry < prep->expiry)
535 prep->expiry = token->kad->expiry;
33941284
DH		 536
537 _leave(" = 0");
538 return 0;
99455153
DH		 539
540inval:
541 ret = -EINVAL;
542error:
543 rxrpc_rxk5_free(rxk5);
544 kfree(token);
545 _leave(" = %d", ret);
546 return ret;
33941284
DH		 547}
548
549/*
550 * attempt to parse the data as the XDR format
551 * - the caller guarantees we have more than 7 words
552 */
8a7a3eb4 553static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
33941284 554{
8a7a3eb4 555 const __be32 *xdr = prep->data, *token;
33941284 556 const char *cp;
eab38dfd 557 unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix;
8a7a3eb4 558 size_t datalen = prep->datalen;
33941284
DH		 559 int ret;
560
561 _enter(",{%x,%x,%x,%x},%zu",
562 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
8a7a3eb4 563 prep->datalen);
33941284
DH		 564
565 if (datalen > AFSTOKEN_LENGTH_MAX)
566 goto not_xdr;
567
568 /* XDR is an array of __be32's */
569 if (datalen & 3)
570 goto not_xdr;
571
572 /* the flags should be 0 (the setpag bit must be handled by
573 * userspace) */
574 if (ntohl(*xdr++) != 0)
575 goto not_xdr;
576 datalen -= 4;
577
578 /* check the cell name */
579 len = ntohl(*xdr++);
580 if (len < 1 || len > AFSTOKEN_CELL_MAX)
581 goto not_xdr;
582 datalen -= 4;
eab38dfd
DH		 583 paddedlen = (len + 3) & ~3;
584 if (paddedlen > datalen)
33941284
DH		 585 goto not_xdr;
586
587 cp = (const char *) xdr;
588 for (loop = 0; loop < len; loop++)
589 if (!isprint(cp[loop]))
590 goto not_xdr;
eab38dfd
DH		 591 for (; loop < paddedlen; loop++)
592 if (cp[loop])
593 goto not_xdr;
33941284 594 _debug("cellname: [%u/%u] '%*.*s'",
eab38dfd
DH		 595 len, paddedlen, len, len, (const char *) xdr);
596 datalen -= paddedlen;
597 xdr += paddedlen >> 2;
33941284
DH		 598
599 /* get the token count */
600 if (datalen < 12)
601 goto not_xdr;
602 ntoken = ntohl(*xdr++);
603 datalen -= 4;
604 _debug("ntoken: %x", ntoken);
605 if (ntoken < 1 || ntoken > AFSTOKEN_MAX)
606 goto not_xdr;
607
608 /* check each token wrapper */
609 token = xdr;
610 loop = ntoken;
611 do {
612 if (datalen < 8)
613 goto not_xdr;
614 toklen = ntohl(*xdr++);
615 sec_ix = ntohl(*xdr);
616 datalen -= 4;
617 _debug("token: [%x/%zx] %x", toklen, datalen, sec_ix);
eab38dfd
DH		 618 paddedlen = (toklen + 3) & ~3;
619 if (toklen < 20 || toklen > datalen || paddedlen > datalen)
33941284 620 goto not_xdr;
eab38dfd
DH		 621 datalen -= paddedlen;
622 xdr += paddedlen >> 2;
33941284
DH		 623
624 } while (--loop > 0);
625
626 _debug("remainder: %zu", datalen);
627 if (datalen != 0)
628 goto not_xdr;
629
630 /* okay: we're going to assume it's valid XDR format
631 * - we ignore the cellname, relying on the key to be correctly named
632 */
633 do {
634 xdr = token;
635 toklen = ntohl(*xdr++);
636 token = xdr + ((toklen + 3) >> 2);
637 sec_ix = ntohl(*xdr++);
638 toklen -= 4;
639
99455153
DH		 640 _debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token);
641
33941284
DH		 642 switch (sec_ix) {
643 case RXRPC_SECURITY_RXKAD:
8a7a3eb4 644 ret = rxrpc_preparse_xdr_rxkad(prep, datalen, xdr, toklen);
33941284
DH		 645 if (ret != 0)
646 goto error;
647 break;
648
99455153 649 case RXRPC_SECURITY_RXK5:
8a7a3eb4 650 ret = rxrpc_preparse_xdr_rxk5(prep, datalen, xdr, toklen);
99455153
DH		 651 if (ret != 0)
652 goto error;
653 break;
654
33941284
DH		 655 default:
656 ret = -EPROTONOSUPPORT;
657 goto error;
658 }
659
660 } while (--ntoken > 0);
661
662 _leave(" = 0");
663 return 0;
664
665not_xdr:
666 _leave(" = -EPROTO");
667 return -EPROTO;
668error:
669 _leave(" = %d", ret);
670 return ret;
671}
672
17926a79 673/*
8a7a3eb4
DH		 674 * Preparse an rxrpc defined key.
675 *
676 * Data should be of the form:
17926a79
DH		 677 * OFFSET LEN CONTENT
678 * 0 4 key interface version number
679 * 4 2 security index (type)
680 * 6 2 ticket length
681 * 8 4 key expiry time (time_t)
682 * 12 4 kvno
683 * 16 8 session key
684 * 24 [len] ticket
685 *
686 * if no data is provided, then a no-security key is made
687 */
8a7a3eb4 688static int rxrpc_preparse(struct key_preparsed_payload *prep)
17926a79 689{
33941284
DH		 690 const struct rxrpc_key_data_v1 *v1;
691 struct rxrpc_key_token *token, **pp;
17926a79
DH		 692 size_t plen;
693 u32 kver;
694 int ret;
695
8a7a3eb4 696 _enter("%zu", prep->datalen);
17926a79
DH		 697
698 /* handle a no-security key */
cf7f601c 699 if (!prep->data && prep->datalen == 0)
17926a79
DH		 700 return 0;
701
33941284 702 /* determine if the XDR payload format is being used */
cf7f601c 703 if (prep->datalen > 7 * 4) {
8a7a3eb4 704 ret = rxrpc_preparse_xdr(prep);
33941284
DH		 705 if (ret != -EPROTO)
706 return ret;
707 }
708
17926a79
DH		 709 /* get the key interface version number */
710 ret = -EINVAL;
cf7f601c 711 if (prep->datalen <= 4 || !prep->data)
17926a79 712 goto error;
cf7f601c
DH		 713 memcpy(&kver, prep->data, sizeof(kver));
714 prep->data += sizeof(kver);
715 prep->datalen -= sizeof(kver);
17926a79
DH		 716
717 _debug("KEY I/F VERSION: %u", kver);
718
719 ret = -EKEYREJECTED;
720 if (kver != 1)
721 goto error;
722
723 /* deal with a version 1 key */
724 ret = -EINVAL;
cf7f601c 725 if (prep->datalen < sizeof(*v1))
17926a79
DH		 726 goto error;
727
cf7f601c
DH		 728 v1 = prep->data;
729 if (prep->datalen != sizeof(*v1) + v1->ticket_length)
17926a79
DH		 730 goto error;
731
33941284
DH		 732 _debug("SCIX: %u", v1->security_index);
733 _debug("TLEN: %u", v1->ticket_length);
734 _debug("EXPY: %x", v1->expiry);
735 _debug("KVNO: %u", v1->kvno);
17926a79 736 _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
33941284
DH		 737 v1->session_key[0], v1->session_key[1],
738 v1->session_key[2], v1->session_key[3],
739 v1->session_key[4], v1->session_key[5],
740 v1->session_key[6], v1->session_key[7]);
741 if (v1->ticket_length >= 8)
17926a79 742 _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
33941284
DH		 743 v1->ticket[0], v1->ticket[1],
744 v1->ticket[2], v1->ticket[3],
745 v1->ticket[4], v1->ticket[5],
746 v1->ticket[6], v1->ticket[7]);
17926a79
DH		 747
748 ret = -EPROTONOSUPPORT;
33941284 749 if (v1->security_index != RXRPC_SECURITY_RXKAD)
17926a79
DH		 750 goto error;
751
33941284 752 plen = sizeof(*token->kad) + v1->ticket_length;
8a7a3eb4 753 prep->quotalen = plen + sizeof(*token);
17926a79
DH		 754
755 ret = -ENOMEM;
0a93ea2e 756 token = kzalloc(sizeof(*token), GFP_KERNEL);
33941284 757 if (!token)
17926a79 758 goto error;
0a93ea2e 759 token->kad = kzalloc(plen, GFP_KERNEL);
33941284
DH		 760 if (!token->kad)
761 goto error_free;
762
763 token->security_index = RXRPC_SECURITY_RXKAD;
764 token->kad->ticket_len = v1->ticket_length;
765 token->kad->expiry = v1->expiry;
766 token->kad->kvno = v1->kvno;
767 memcpy(&token->kad->session_key, &v1->session_key, 8);
768 memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length);
17926a79 769
8a7a3eb4 770 /* count the number of tokens attached */
146aa8b1 771 prep->payload.data[1] = (void *)((unsigned long)prep->payload.data[1] + 1);
33941284 772
8a7a3eb4 773 /* attach the data */
146aa8b1 774 pp = (struct rxrpc_key_token **)&prep->payload.data[0];
33941284
DH		 775 while (*pp)
776 pp = &(*pp)->next;
777 *pp = token;
8a7a3eb4
DH		 778 if (token->kad->expiry < prep->expiry)
779 prep->expiry = token->kad->expiry;
33941284 780 token = NULL;
17926a79
DH		 781 ret = 0;
782
33941284
DH		 783error_free:
784 kfree(token);
17926a79
DH		 785error:
786 return ret;
787}
788
789/*
8a7a3eb4 790 * Free token list.
17926a79 791 */
8a7a3eb4
DH		 792static void rxrpc_free_token_list(struct rxrpc_key_token *token)
793{
794 struct rxrpc_key_token *next;
795
796 for (; token; token = next) {
797 next = token->next;
798 switch (token->security_index) {
799 case RXRPC_SECURITY_RXKAD:
800 kfree(token->kad);
801 break;
802 case RXRPC_SECURITY_RXK5:
803 if (token->k5)
804 rxrpc_rxk5_free(token->k5);
805 break;
806 default:
807 printk(KERN_ERR "Unknown token type %x on rxrpc key\n",
808 token->security_index);
809 BUG();
810 }
811
812 kfree(token);
813 }
814}
815
816/*
817 * Clean up preparse data.
818 */
819static void rxrpc_free_preparse(struct key_preparsed_payload *prep)
820{
146aa8b1 821 rxrpc_free_token_list(prep->payload.data[0]);
8a7a3eb4
DH		 822}
823
824/*
825 * Preparse a server secret key.
826 *
827 * The data should be the 8-byte secret key.
828 */
829static int rxrpc_preparse_s(struct key_preparsed_payload *prep)
17926a79
DH		 830{
831 struct crypto_blkcipher *ci;
832
8a7a3eb4 833 _enter("%zu", prep->datalen);
17926a79 834
cf7f601c 835 if (prep->datalen != 8)
17926a79
DH		 836 return -EINVAL;
837
146aa8b1 838 memcpy(&prep->payload.data[2], prep->data, 8);
17926a79
DH		 839
840 ci = crypto_alloc_blkcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC);
841 if (IS_ERR(ci)) {
842 _leave(" = %ld", PTR_ERR(ci));
843 return PTR_ERR(ci);
844 }
845
cf7f601c 846 if (crypto_blkcipher_setkey(ci, prep->data, 8) < 0)
17926a79
DH		 847 BUG();
848
146aa8b1 849 prep->payload.data[0] = ci;
17926a79
DH		 850 _leave(" = 0");
851 return 0;
852}
853
8a7a3eb4
DH		 854/*
855 * Clean up preparse data.
856 */
857static void rxrpc_free_preparse_s(struct key_preparsed_payload *prep)
858{
146aa8b1
DH		 859 if (prep->payload.data[0])
860 crypto_free_blkcipher(prep->payload.data[0]);
8a7a3eb4
DH		 861}
862
17926a79
DH		 863/*
864 * dispose of the data dangling from the corpse of a rxrpc key
865 */
866static void rxrpc_destroy(struct key *key)
867{
146aa8b1 868 rxrpc_free_token_list(key->payload.data[0]);
17926a79
DH		 869}
870
871/*
872 * dispose of the data dangling from the corpse of a rxrpc key
873 */
874static void rxrpc_destroy_s(struct key *key)
875{
146aa8b1
DH		 876 if (key->payload.data[0]) {
877 crypto_free_blkcipher(key->payload.data[0]);
878 key->payload.data[0] = NULL;
17926a79
DH		 879 }
880}
881
882/*
883 * describe the rxrpc key
884 */
885static void rxrpc_describe(const struct key *key, struct seq_file *m)
886{
887 seq_puts(m, key->description);
888}
889
890/*
891 * grab the security key for a socket
892 */
893int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
894{
895 struct key *key;
896 char *description;
897
898 _enter("");
899
900 if (optlen <= 0 || optlen > PAGE_SIZE - 1)
901 return -EINVAL;
902
903 description = kmalloc(optlen + 1, GFP_KERNEL);
904 if (!description)
905 return -ENOMEM;
906
907 if (copy_from_user(description, optval, optlen)) {
908 kfree(description);
909 return -EFAULT;
910 }
911 description[optlen] = 0;
912
913 key = request_key(&key_type_rxrpc, description, NULL);
914 if (IS_ERR(key)) {
915 kfree(description);
916 _leave(" = %ld", PTR_ERR(key));
917 return PTR_ERR(key);
918 }
919
920 rx->key = key;
921 kfree(description);
922 _leave(" = 0 [key %x]", key->serial);
923 return 0;
924}
925
926/*
927 * grab the security keyring for a server socket
928 */
929int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval,
930 int optlen)
931{
932 struct key *key;
933 char *description;
934
935 _enter("");
936
937 if (optlen <= 0 || optlen > PAGE_SIZE - 1)
938 return -EINVAL;
939
940 description = kmalloc(optlen + 1, GFP_KERNEL);
941 if (!description)
942 return -ENOMEM;
943
944 if (copy_from_user(description, optval, optlen)) {
945 kfree(description);
946 return -EFAULT;
947 }
948 description[optlen] = 0;
949
950 key = request_key(&key_type_keyring, description, NULL);
951 if (IS_ERR(key)) {
952 kfree(description);
953 _leave(" = %ld", PTR_ERR(key));
954 return PTR_ERR(key);
955 }
956
957 rx->securities = key;
958 kfree(description);
959 _leave(" = 0 [key %x]", key->serial);
960 return 0;
961}
962
963/*
964 * generate a server data key
965 */
966int rxrpc_get_server_data_key(struct rxrpc_connection *conn,
967 const void *session_key,
968 time_t expiry,
969 u32 kvno)
970{
d84f4f99 971 const struct cred *cred = current_cred();
17926a79
DH		 972 struct key *key;
973 int ret;
974
975 struct {
976 u32 kver;
33941284 977 struct rxrpc_key_data_v1 v1;
17926a79
DH		 978 } data;
979
980 _enter("");
981
c6089735
EB		 982 key = key_alloc(&key_type_rxrpc, "x",
983 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, 0,
17926a79
DH		 984 KEY_ALLOC_NOT_IN_QUOTA);
985 if (IS_ERR(key)) {
986 _leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key));
987 return -ENOMEM;
988 }
989
990 _debug("key %d", key_serial(key));
991
992 data.kver = 1;
33941284
DH		 993 data.v1.security_index = RXRPC_SECURITY_RXKAD;
994 data.v1.ticket_length = 0;
995 data.v1.expiry = expiry;
996 data.v1.kvno = 0;
17926a79 997
33941284 998 memcpy(&data.v1.session_key, session_key, sizeof(data.v1.session_key));
17926a79
DH		 999
1000 ret = key_instantiate_and_link(key, &data, sizeof(data), NULL, NULL);
1001 if (ret < 0)
1002 goto error;
1003
1004 conn->key = key;
1005 _leave(" = 0 [%d]", key_serial(key));
1006 return 0;
1007
1008error:
1009 key_revoke(key);
1010 key_put(key);
1011 _leave(" = -ENOMEM [ins %d]", ret);
1012 return -ENOMEM;
1013}
17926a79 1014EXPORT_SYMBOL(rxrpc_get_server_data_key);
76181c13
DH		 1015
1016/**
1017 * rxrpc_get_null_key - Generate a null RxRPC key
1018 * @keyname: The name to give the key.
1019 *
1020 * Generate a null RxRPC key that can be used to indicate anonymous security is
1021 * required for a particular domain.
1022 */
1023struct key *rxrpc_get_null_key(const char *keyname)
1024{
d84f4f99 1025 const struct cred *cred = current_cred();
76181c13
DH		 1026 struct key *key;
1027 int ret;
1028
c6089735
EB		 1029 key = key_alloc(&key_type_rxrpc, keyname,
1030 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
76181c13
DH		 1031 KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA);
1032 if (IS_ERR(key))
1033 return key;
1034
1035 ret = key_instantiate_and_link(key, NULL, 0, NULL, NULL);
1036 if (ret < 0) {
1037 key_revoke(key);
1038 key_put(key);
1039 return ERR_PTR(ret);
1040 }
1041
1042 return key;
1043}
1044EXPORT_SYMBOL(rxrpc_get_null_key);
ed6dd18b
DH		 1045
1046/*
1047 * read the contents of an rxrpc key
1048 * - this returns the result in XDR form
1049 */
1050static long rxrpc_read(const struct key *key,
1051 char __user *buffer, size_t buflen)
1052{
99455153
DH		 1053 const struct rxrpc_key_token *token;
1054 const struct krb5_principal *princ;
1055 size_t size;
1056 __be32 __user *xdr, *oldxdr;
1057 u32 cnlen, toksize, ntoks, tok, zero;
1058 u16 toksizes[AFSTOKEN_MAX];
1059 int loop;
ed6dd18b
DH		 1060
1061 _enter("");
1062
1063 /* we don't know what form we should return non-AFS keys in */
1064 if (memcmp(key->description, "afs@", 4) != 0)
1065 return -EOPNOTSUPP;
1066 cnlen = strlen(key->description + 4);
1067
99455153
DH		 1068#define RND(X) (((X) + 3) & ~3)
1069
ed6dd18b
DH		 1070 /* AFS keys we return in XDR form, so we need to work out the size of
1071 * the XDR */
1072 size = 2 * 4; /* flags, cellname len */
99455153 1073 size += RND(cnlen); /* cellname */
ed6dd18b
DH		 1074 size += 1 * 4; /* token count */
1075
1076 ntoks = 0;
146aa8b1 1077 for (token = key->payload.data[0]; token; token = token->next) {
99455153
DH		 1078 toksize = 4; /* sec index */
1079
ed6dd18b
DH		 1080 switch (token->security_index) {
1081 case RXRPC_SECURITY_RXKAD:
99455153
DH		 1082 toksize += 8 * 4; /* viceid, kvno, key*2, begin,
1083 * end, primary, tktlen */
1084 toksize += RND(token->kad->ticket_len);
ed6dd18b
DH		 1085 break;
1086
99455153
DH		 1087 case RXRPC_SECURITY_RXK5:
1088 princ = &token->k5->client;
1089 toksize += 4 + princ->n_name_parts * 4;
1090 for (loop = 0; loop < princ->n_name_parts; loop++)
1091 toksize += RND(strlen(princ->name_parts[loop]));
1092 toksize += 4 + RND(strlen(princ->realm));
1093
1094 princ = &token->k5->server;
1095 toksize += 4 + princ->n_name_parts * 4;
1096 for (loop = 0; loop < princ->n_name_parts; loop++)
1097 toksize += RND(strlen(princ->name_parts[loop]));
1098 toksize += 4 + RND(strlen(princ->realm));
1099
1100 toksize += 8 + RND(token->k5->session.data_len);
1101
1102 toksize += 4 * 8 + 2 * 4;
1103
1104 toksize += 4 + token->k5->n_addresses * 8;
1105 for (loop = 0; loop < token->k5->n_addresses; loop++)
1106 toksize += RND(token->k5->addresses[loop].data_len);
1107
1108 toksize += 4 + RND(token->k5->ticket_len);
1109 toksize += 4 + RND(token->k5->ticket2_len);
1110
1111 toksize += 4 + token->k5->n_authdata * 8;
1112 for (loop = 0; loop < token->k5->n_authdata; loop++)
1113 toksize += RND(token->k5->authdata[loop].data_len);
ed6dd18b 1114 break;
99455153
DH		 1115
1116 default: /* we have a ticket we can't encode */
1117 BUG();
1118 continue;
ed6dd18b 1119 }
99455153
DH		 1120
1121 _debug("token[%u]: toksize=%u", ntoks, toksize);
1122 ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX);
1123
1124 toksizes[ntoks++] = toksize;
1125 size += toksize + 4; /* each token has a length word */
ed6dd18b
DH		 1126 }
1127
99455153
DH		 1128#undef RND
1129
ed6dd18b
DH		 1130 if (!buffer || buflen < size)
1131 return size;
1132
1133 xdr = (__be32 __user *) buffer;
1134 zero = 0;
1135#define ENCODE(x) \
1136 do { \
1137 __be32 y = htonl(x); \
1138 if (put_user(y, xdr++) < 0) \
1139 goto fault; \
1140 } while(0)
99455153
DH		 1141#define ENCODE_DATA(l, s) \
1142 do { \
1143 u32 _l = (l); \
1144 ENCODE(l); \
1145 if (copy_to_user(xdr, (s), _l) != 0) \
1146 goto fault; \
1147 if (_l & 3 && \
ed3bfdfd 1148 copy_to_user((u8 __user *)xdr + _l, &zero, 4 - (_l & 3)) != 0) \
99455153
DH		 1149 goto fault; \
1150 xdr += (_l + 3) >> 2; \
1151 } while(0)
1152#define ENCODE64(x) \
1153 do { \
1154 __be64 y = cpu_to_be64(x); \
1155 if (copy_to_user(xdr, &y, 8) != 0) \
1156 goto fault; \
1157 xdr += 8 >> 2; \
1158 } while(0)
1159#define ENCODE_STR(s) \
1160 do { \
1161 const char *_s = (s); \
1162 ENCODE_DATA(strlen(_s), _s); \
1163 } while(0)
ed6dd18b 1164
99455153
DH		 1165 ENCODE(0); /* flags */
1166 ENCODE_DATA(cnlen, key->description + 4); /* cellname */
1167 ENCODE(ntoks);
ed6dd18b 1168
99455153 1169 tok = 0;
146aa8b1 1170 for (token = key->payload.data[0]; token; token = token->next) {
99455153
DH		 1171 toksize = toksizes[tok++];
1172 ENCODE(toksize);
1173 oldxdr = xdr;
1174 ENCODE(token->security_index);
ed6dd18b
DH		 1175
1176 switch (token->security_index) {
1177 case RXRPC_SECURITY_RXKAD:
ed6dd18b
DH		 1178 ENCODE(token->kad->vice_id);
1179 ENCODE(token->kad->kvno);
99455153 1180 ENCODE_DATA(8, token->kad->session_key);
ed6dd18b
DH		 1181 ENCODE(token->kad->start);
1182 ENCODE(token->kad->expiry);
1183 ENCODE(token->kad->primary_flag);
99455153
DH		 1184 ENCODE_DATA(token->kad->ticket_len, token->kad->ticket);
1185 break;
1186
1187 case RXRPC_SECURITY_RXK5:
1188 princ = &token->k5->client;
1189 ENCODE(princ->n_name_parts);
1190 for (loop = 0; loop < princ->n_name_parts; loop++)
1191 ENCODE_STR(princ->name_parts[loop]);
1192 ENCODE_STR(princ->realm);
1193
1194 princ = &token->k5->server;
1195 ENCODE(princ->n_name_parts);
1196 for (loop = 0; loop < princ->n_name_parts; loop++)
1197 ENCODE_STR(princ->name_parts[loop]);
1198 ENCODE_STR(princ->realm);
1199
1200 ENCODE(token->k5->session.tag);
1201 ENCODE_DATA(token->k5->session.data_len,
1202 token->k5->session.data);
1203
1204 ENCODE64(token->k5->authtime);
1205 ENCODE64(token->k5->starttime);
1206 ENCODE64(token->k5->endtime);
1207 ENCODE64(token->k5->renew_till);
1208 ENCODE(token->k5->is_skey);
1209 ENCODE(token->k5->flags);
1210
1211 ENCODE(token->k5->n_addresses);
1212 for (loop = 0; loop < token->k5->n_addresses; loop++) {
1213 ENCODE(token->k5->addresses[loop].tag);
1214 ENCODE_DATA(token->k5->addresses[loop].data_len,
1215 token->k5->addresses[loop].data);
1216 }
1217
1218 ENCODE_DATA(token->k5->ticket_len, token->k5->ticket);
1219 ENCODE_DATA(token->k5->ticket2_len, token->k5->ticket2);
1220
1221 ENCODE(token->k5->n_authdata);
1222 for (loop = 0; loop < token->k5->n_authdata; loop++) {
1223 ENCODE(token->k5->authdata[loop].tag);
1224 ENCODE_DATA(token->k5->authdata[loop].data_len,
1225 token->k5->authdata[loop].data);
1226 }
ed6dd18b
DH		 1227 break;
1228
1229 default:
99455153 1230 BUG();
ed6dd18b
DH		 1231 break;
1232 }
99455153
DH		 1233
1234 ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==,
1235 toksize);
ed6dd18b
DH		 1236 }
1237
99455153
DH		 1238#undef ENCODE_STR
1239#undef ENCODE_DATA
1240#undef ENCODE64
ed6dd18b
DH		 1241#undef ENCODE
1242
99455153 1243 ASSERTCMP(tok, ==, ntoks);
ed6dd18b
DH		 1244 ASSERTCMP((char __user *) xdr - buffer, ==, size);
1245 _leave(" = %zu", size);
1246 return size;
1247
1248fault:
1249 _leave(" = -EFAULT");
1250 return -EFAULT;
1251}