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ALSA: hda - Update descriptions about new position_fix values
[linux-2.6-block.git] / net / rxrpc / key.c
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2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
17926a79
DH		 2/* RxRPC key management
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 *
17926a79
DH		 7 * RxRPC keys should have a description of describing their purpose:
8 * "afs@CAMBRIDGE.REDHAT.COM>
9 */
10
9b6d5398
JP		 11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
1afe593b 13#include <crypto/skcipher.h>
17926a79
DH		 14#include <linux/module.h>
15#include <linux/net.h>
16#include <linux/skbuff.h>
76181c13 17#include <linux/key-type.h>
33941284 18#include <linux/ctype.h>
5a0e3ad6 19#include <linux/slab.h>
17926a79
DH		 20#include <net/sock.h>
21#include <net/af_rxrpc.h>
22#include <keys/rxrpc-type.h>
23#include <keys/user-type.h>
24#include "ar-internal.h"
25
b9fffa38 26static int rxrpc_vet_description_s(const char *);
8a7a3eb4
DH		 27static int rxrpc_preparse(struct key_preparsed_payload *);
28static int rxrpc_preparse_s(struct key_preparsed_payload *);
29static void rxrpc_free_preparse(struct key_preparsed_payload *);
30static void rxrpc_free_preparse_s(struct key_preparsed_payload *);
17926a79
DH		 31static void rxrpc_destroy(struct key *);
32static void rxrpc_destroy_s(struct key *);
33static void rxrpc_describe(const struct key *, struct seq_file *);
ed6dd18b 34static long rxrpc_read(const struct key *, char __user *, size_t);
17926a79
DH		 35
36/*
37 * rxrpc defined keys take an arbitrary string as the description and an
38 * arbitrary blob of data as the payload
39 */
40struct key_type key_type_rxrpc = {
41 .name = "rxrpc",
9b242610 42 .flags = KEY_TYPE_NET_DOMAIN,
8a7a3eb4
DH		 43 .preparse = rxrpc_preparse,
44 .free_preparse = rxrpc_free_preparse,
45 .instantiate = generic_key_instantiate,
17926a79
DH		 46 .destroy = rxrpc_destroy,
47 .describe = rxrpc_describe,
ed6dd18b 48 .read = rxrpc_read,
17926a79 49};
17926a79
DH		 50EXPORT_SYMBOL(key_type_rxrpc);
51
52/*
53 * rxrpc server defined keys take "<serviceId>:<securityIndex>" as the
54 * description and an 8-byte decryption key as the payload
55 */
56struct key_type key_type_rxrpc_s = {
57 .name = "rxrpc_s",
9b242610 58 .flags = KEY_TYPE_NET_DOMAIN,
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;
10674a03 93 time64_t expiry;
33941284
DH		 94 size_t plen;
95 u32 tktlen;
33941284
DH		 96
97 _enter(",{%x,%x,%x,%x},%u",
98 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
99 toklen);
100
101 if (toklen <= 8 * 4)
102 return -EKEYREJECTED;
103 tktlen = ntohl(xdr[7]);
104 _debug("tktlen: %x", tktlen);
105 if (tktlen > AFSTOKEN_RK_TIX_MAX)
106 return -EKEYREJECTED;
fde0133b 107 if (toklen < 8 * 4 + tktlen)
33941284
DH		 108 return -EKEYREJECTED;
109
110 plen = sizeof(*token) + sizeof(*token->kad) + tktlen;
8a7a3eb4 111 prep->quotalen = datalen + plen;
33941284
DH		 112
113 plen -= sizeof(*token);
0a93ea2e 114 token = kzalloc(sizeof(*token), GFP_KERNEL);
33941284
DH		 115 if (!token)
116 return -ENOMEM;
117
0a93ea2e 118 token->kad = kzalloc(plen, GFP_KERNEL);
33941284
DH		 119 if (!token->kad) {
120 kfree(token);
121 return -ENOMEM;
122 }
123
124 token->security_index = RXRPC_SECURITY_RXKAD;
125 token->kad->ticket_len = tktlen;
126 token->kad->vice_id = ntohl(xdr[0]);
127 token->kad->kvno = ntohl(xdr[1]);
128 token->kad->start = ntohl(xdr[4]);
129 token->kad->expiry = ntohl(xdr[5]);
130 token->kad->primary_flag = ntohl(xdr[6]);
131 memcpy(&token->kad->session_key, &xdr[2], 8);
132 memcpy(&token->kad->ticket, &xdr[8], tktlen);
133
134 _debug("SCIX: %u", token->security_index);
135 _debug("TLEN: %u", token->kad->ticket_len);
136 _debug("EXPY: %x", token->kad->expiry);
137 _debug("KVNO: %u", token->kad->kvno);
138 _debug("PRIM: %u", token->kad->primary_flag);
139 _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
140 token->kad->session_key[0], token->kad->session_key[1],
141 token->kad->session_key[2], token->kad->session_key[3],
142 token->kad->session_key[4], token->kad->session_key[5],
143 token->kad->session_key[6], token->kad->session_key[7]);
144 if (token->kad->ticket_len >= 8)
145 _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
146 token->kad->ticket[0], token->kad->ticket[1],
147 token->kad->ticket[2], token->kad->ticket[3],
148 token->kad->ticket[4], token->kad->ticket[5],
149 token->kad->ticket[6], token->kad->ticket[7]);
150
151 /* count the number of tokens attached */
146aa8b1 152 prep->payload.data[1] = (void *)((unsigned long)prep->payload.data[1] + 1);
33941284
DH		 153
154 /* attach the data */
146aa8b1 155 for (pptoken = (struct rxrpc_key_token **)&prep->payload.data[0];
99455153
DH		 156 *pptoken;
157 pptoken = &(*pptoken)->next)
158 continue;
159 *pptoken = token;
10674a03
BW		 160 expiry = rxrpc_u32_to_time64(token->kad->expiry);
161 if (expiry < prep->expiry)
162 prep->expiry = expiry;
99455153
DH		 163
164 _leave(" = 0");
165 return 0;
166}
167
168static void rxrpc_free_krb5_principal(struct krb5_principal *princ)
169{
170 int loop;
171
172 if (princ->name_parts) {
173 for (loop = princ->n_name_parts - 1; loop >= 0; loop--)
174 kfree(princ->name_parts[loop]);
175 kfree(princ->name_parts);
176 }
177 kfree(princ->realm);
178}
179
180static void rxrpc_free_krb5_tagged(struct krb5_tagged_data *td)
181{
182 kfree(td->data);
183}
184
185/*
186 * free up an RxK5 token
187 */
188static void rxrpc_rxk5_free(struct rxk5_key *rxk5)
189{
190 int loop;
191
192 rxrpc_free_krb5_principal(&rxk5->client);
193 rxrpc_free_krb5_principal(&rxk5->server);
194 rxrpc_free_krb5_tagged(&rxk5->session);
195
196 if (rxk5->addresses) {
197 for (loop = rxk5->n_addresses - 1; loop >= 0; loop--)
198 rxrpc_free_krb5_tagged(&rxk5->addresses[loop]);
199 kfree(rxk5->addresses);
200 }
201 if (rxk5->authdata) {
202 for (loop = rxk5->n_authdata - 1; loop >= 0; loop--)
203 rxrpc_free_krb5_tagged(&rxk5->authdata[loop]);
204 kfree(rxk5->authdata);
205 }
206
207 kfree(rxk5->ticket);
208 kfree(rxk5->ticket2);
209 kfree(rxk5);
210}
211
212/*
213 * extract a krb5 principal
214 */
215static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,
216 const __be32 **_xdr,
95c96174 217 unsigned int *_toklen)
99455153
DH		 218{
219 const __be32 *xdr = *_xdr;
5f2f9765 220 unsigned int toklen = *_toklen, n_parts, loop, tmp, paddedlen;
99455153
DH		 221
222 /* there must be at least one name, and at least #names+1 length
223 * words */
224 if (toklen <= 12)
225 return -EINVAL;
226
227 _enter(",{%x,%x,%x},%u",
228 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), toklen);
229
230 n_parts = ntohl(*xdr++);
231 toklen -= 4;
232 if (n_parts <= 0 || n_parts > AFSTOKEN_K5_COMPONENTS_MAX)
233 return -EINVAL;
234 princ->n_name_parts = n_parts;
235
236 if (toklen <= (n_parts + 1) * 4)
237 return -EINVAL;
238
f65bd5ec 239 princ->name_parts = kcalloc(n_parts, sizeof(char *), GFP_KERNEL);
99455153
DH		 240 if (!princ->name_parts)
241 return -ENOMEM;
242
243 for (loop = 0; loop < n_parts; loop++) {
244 if (toklen < 4)
245 return -EINVAL;
246 tmp = ntohl(*xdr++);
247 toklen -= 4;
248 if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX)
249 return -EINVAL;
5f2f9765
DH		 250 paddedlen = (tmp + 3) & ~3;
251 if (paddedlen > toklen)
99455153
DH		 252 return -EINVAL;
253 princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL);
254 if (!princ->name_parts[loop])
255 return -ENOMEM;
256 memcpy(princ->name_parts[loop], xdr, tmp);
257 princ->name_parts[loop][tmp] = 0;
5f2f9765
DH		 258 toklen -= paddedlen;
259 xdr += paddedlen >> 2;
99455153
DH		 260 }
261
262 if (toklen < 4)
263 return -EINVAL;
264 tmp = ntohl(*xdr++);
265 toklen -= 4;
266 if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX)
267 return -EINVAL;
5f2f9765
DH		 268 paddedlen = (tmp + 3) & ~3;
269 if (paddedlen > toklen)
99455153
DH		 270 return -EINVAL;
271 princ->realm = kmalloc(tmp + 1, GFP_KERNEL);
272 if (!princ->realm)
273 return -ENOMEM;
274 memcpy(princ->realm, xdr, tmp);
275 princ->realm[tmp] = 0;
5f2f9765
DH		 276 toklen -= paddedlen;
277 xdr += paddedlen >> 2;
99455153
DH		 278
279 _debug("%s/...@%s", princ->name_parts[0], princ->realm);
280
281 *_xdr = xdr;
282 *_toklen = toklen;
283 _leave(" = 0 [toklen=%u]", toklen);
284 return 0;
285}
286
287/*
288 * extract a piece of krb5 tagged data
289 */
290static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,
291 size_t max_data_size,
292 const __be32 **_xdr,
95c96174 293 unsigned int *_toklen)
99455153
DH		 294{
295 const __be32 *xdr = *_xdr;
5f2f9765 296 unsigned int toklen = *_toklen, len, paddedlen;
99455153
DH		 297
298 /* there must be at least one tag and one length word */
299 if (toklen <= 8)
300 return -EINVAL;
301
302 _enter(",%zu,{%x,%x},%u",
303 max_data_size, ntohl(xdr[0]), ntohl(xdr[1]), toklen);
304
305 td->tag = ntohl(*xdr++);
306 len = ntohl(*xdr++);
307 toklen -= 8;
308 if (len > max_data_size)
309 return -EINVAL;
5f2f9765
DH		 310 paddedlen = (len + 3) & ~3;
311 if (paddedlen > toklen)
312 return -EINVAL;
99455153
DH		 313 td->data_len = len;
314
315 if (len > 0) {
65d9d2ca 316 td->data = kmemdup(xdr, len, GFP_KERNEL);
99455153
DH		 317 if (!td->data)
318 return -ENOMEM;
5f2f9765
DH		 319 toklen -= paddedlen;
320 xdr += paddedlen >> 2;
99455153
DH		 321 }
322
323 _debug("tag %x len %x", td->tag, td->data_len);
324
325 *_xdr = xdr;
326 *_toklen = toklen;
327 _leave(" = 0 [toklen=%u]", toklen);
328 return 0;
329}
330
331/*
332 * extract an array of tagged data
333 */
334static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td,
335 u8 *_n_elem,
336 u8 max_n_elem,
337 size_t max_elem_size,
338 const __be32 **_xdr,
95c96174 339 unsigned int *_toklen)
99455153
DH		 340{
341 struct krb5_tagged_data *td;
342 const __be32 *xdr = *_xdr;
95c96174 343 unsigned int toklen = *_toklen, n_elem, loop;
99455153
DH		 344 int ret;
345
346 /* there must be at least one count */
347 if (toklen < 4)
348 return -EINVAL;
349
350 _enter(",,%u,%zu,{%x},%u",
351 max_n_elem, max_elem_size, ntohl(xdr[0]), toklen);
352
353 n_elem = ntohl(*xdr++);
354 toklen -= 4;
fa4eff44 355 if (n_elem > max_n_elem)
99455153
DH		 356 return -EINVAL;
357 *_n_elem = n_elem;
358 if (n_elem > 0) {
359 if (toklen <= (n_elem + 1) * 4)
360 return -EINVAL;
361
362 _debug("n_elem %d", n_elem);
363
f65bd5ec 364 td = kcalloc(n_elem, sizeof(struct krb5_tagged_data),
99455153
DH		 365 GFP_KERNEL);
366 if (!td)
367 return -ENOMEM;
368 *_td = td;
369
370 for (loop = 0; loop < n_elem; loop++) {
371 ret = rxrpc_krb5_decode_tagged_data(&td[loop],
372 max_elem_size,
373 &xdr, &toklen);
374 if (ret < 0)
375 return ret;
376 }
377 }
378
379 *_xdr = xdr;
380 *_toklen = toklen;
381 _leave(" = 0 [toklen=%u]", toklen);
382 return 0;
383}
384
385/*
386 * extract a krb5 ticket
387 */
4e36a95e 388static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
95c96174 389 const __be32 **_xdr, unsigned int *_toklen)
99455153
DH		 390{
391 const __be32 *xdr = *_xdr;
5f2f9765 392 unsigned int toklen = *_toklen, len, paddedlen;
99455153
DH		 393
394 /* there must be at least one length word */
395 if (toklen <= 4)
396 return -EINVAL;
397
398 _enter(",{%x},%u", ntohl(xdr[0]), toklen);
399
400 len = ntohl(*xdr++);
401 toklen -= 4;
402 if (len > AFSTOKEN_K5_TIX_MAX)
403 return -EINVAL;
5f2f9765
DH		 404 paddedlen = (len + 3) & ~3;
405 if (paddedlen > toklen)
406 return -EINVAL;
99455153
DH		 407 *_tktlen = len;
408
409 _debug("ticket len %u", len);
410
411 if (len > 0) {
65d9d2ca 412 *_ticket = kmemdup(xdr, len, GFP_KERNEL);
99455153
DH		 413 if (!*_ticket)
414 return -ENOMEM;
5f2f9765
DH		 415 toklen -= paddedlen;
416 xdr += paddedlen >> 2;
99455153
DH		 417 }
418
419 *_xdr = xdr;
420 *_toklen = toklen;
421 _leave(" = 0 [toklen=%u]", toklen);
422 return 0;
423}
424
425/*
426 * parse an RxK5 type XDR format token
427 * - the caller guarantees we have at least 4 words
428 */
8a7a3eb4
DH		 429static int rxrpc_preparse_xdr_rxk5(struct key_preparsed_payload *prep,
430 size_t datalen,
431 const __be32 *xdr, unsigned int toklen)
99455153
DH		 432{
433 struct rxrpc_key_token *token, **pptoken;
434 struct rxk5_key *rxk5;
435 const __be32 *end_xdr = xdr + (toklen >> 2);
10674a03 436 time64_t expiry;
99455153
DH		 437 int ret;
438
439 _enter(",{%x,%x,%x,%x},%u",
440 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
441 toklen);
442
443 /* reserve some payload space for this subkey - the length of the token
444 * is a reasonable approximation */
8a7a3eb4 445 prep->quotalen = datalen + toklen;
99455153
DH		 446
447 token = kzalloc(sizeof(*token), GFP_KERNEL);
448 if (!token)
449 return -ENOMEM;
450
451 rxk5 = kzalloc(sizeof(*rxk5), GFP_KERNEL);
452 if (!rxk5) {
453 kfree(token);
454 return -ENOMEM;
455 }
456
457 token->security_index = RXRPC_SECURITY_RXK5;
458 token->k5 = rxk5;
459
460 /* extract the principals */
461 ret = rxrpc_krb5_decode_principal(&rxk5->client, &xdr, &toklen);
462 if (ret < 0)
463 goto error;
464 ret = rxrpc_krb5_decode_principal(&rxk5->server, &xdr, &toklen);
465 if (ret < 0)
466 goto error;
467
468 /* extract the session key and the encoding type (the tag field ->
469 * ENCTYPE_xxx) */
470 ret = rxrpc_krb5_decode_tagged_data(&rxk5->session, AFSTOKEN_DATA_MAX,
471 &xdr, &toklen);
472 if (ret < 0)
473 goto error;
474
475 if (toklen < 4 * 8 + 2 * 4)
476 goto inval;
477 rxk5->authtime = be64_to_cpup((const __be64 *) xdr);
478 xdr += 2;
479 rxk5->starttime = be64_to_cpup((const __be64 *) xdr);
480 xdr += 2;
481 rxk5->endtime = be64_to_cpup((const __be64 *) xdr);
482 xdr += 2;
483 rxk5->renew_till = be64_to_cpup((const __be64 *) xdr);
484 xdr += 2;
485 rxk5->is_skey = ntohl(*xdr++);
486 rxk5->flags = ntohl(*xdr++);
487 toklen -= 4 * 8 + 2 * 4;
488
489 _debug("times: a=%llx s=%llx e=%llx rt=%llx",
490 rxk5->authtime, rxk5->starttime, rxk5->endtime,
491 rxk5->renew_till);
492 _debug("is_skey=%x flags=%x", rxk5->is_skey, rxk5->flags);
493
494 /* extract the permitted client addresses */
495 ret = rxrpc_krb5_decode_tagged_array(&rxk5->addresses,
496 &rxk5->n_addresses,
497 AFSTOKEN_K5_ADDRESSES_MAX,
498 AFSTOKEN_DATA_MAX,
499 &xdr, &toklen);
500 if (ret < 0)
501 goto error;
502
503 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
504
505 /* extract the tickets */
506 ret = rxrpc_krb5_decode_ticket(&rxk5->ticket, &rxk5->ticket_len,
507 &xdr, &toklen);
508 if (ret < 0)
509 goto error;
510 ret = rxrpc_krb5_decode_ticket(&rxk5->ticket2, &rxk5->ticket2_len,
511 &xdr, &toklen);
512 if (ret < 0)
513 goto error;
514
515 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
516
517 /* extract the typed auth data */
518 ret = rxrpc_krb5_decode_tagged_array(&rxk5->authdata,
519 &rxk5->n_authdata,
520 AFSTOKEN_K5_AUTHDATA_MAX,
521 AFSTOKEN_BDATALN_MAX,
522 &xdr, &toklen);
523 if (ret < 0)
524 goto error;
525
526 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
527
528 if (toklen != 0)
529 goto inval;
530
8a7a3eb4 531 /* attach the payload */
146aa8b1 532 for (pptoken = (struct rxrpc_key_token **)&prep->payload.data[0];
99455153
DH		 533 *pptoken;
534 pptoken = &(*pptoken)->next)
535 continue;
536 *pptoken = token;
0a378585 537 expiry = rxrpc_u32_to_time64(token->k5->endtime);
10674a03
BW		 538 if (expiry < prep->expiry)
539 prep->expiry = expiry;
33941284
DH		 540
541 _leave(" = 0");
542 return 0;
99455153
DH		 543
544inval:
545 ret = -EINVAL;
546error:
547 rxrpc_rxk5_free(rxk5);
548 kfree(token);
549 _leave(" = %d", ret);
550 return ret;
33941284
DH		 551}
552
553/*
554 * attempt to parse the data as the XDR format
555 * - the caller guarantees we have more than 7 words
556 */
8a7a3eb4 557static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
33941284 558{
8a7a3eb4 559 const __be32 *xdr = prep->data, *token;
33941284 560 const char *cp;
5f2f9765 561 unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix;
8a7a3eb4 562 size_t datalen = prep->datalen;
33941284
DH		 563 int ret;
564
565 _enter(",{%x,%x,%x,%x},%zu",
566 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
8a7a3eb4 567 prep->datalen);
33941284
DH		 568
569 if (datalen > AFSTOKEN_LENGTH_MAX)
570 goto not_xdr;
571
572 /* XDR is an array of __be32's */
573 if (datalen & 3)
574 goto not_xdr;
575
576 /* the flags should be 0 (the setpag bit must be handled by
577 * userspace) */
578 if (ntohl(*xdr++) != 0)
579 goto not_xdr;
580 datalen -= 4;
581
582 /* check the cell name */
583 len = ntohl(*xdr++);
584 if (len < 1 || len > AFSTOKEN_CELL_MAX)
585 goto not_xdr;
586 datalen -= 4;
5f2f9765
DH		 587 paddedlen = (len + 3) & ~3;
588 if (paddedlen > datalen)
33941284
DH		 589 goto not_xdr;
590
591 cp = (const char *) xdr;
592 for (loop = 0; loop < len; loop++)
593 if (!isprint(cp[loop]))
594 goto not_xdr;
5f2f9765
DH		 595 for (; loop < paddedlen; loop++)
596 if (cp[loop])
597 goto not_xdr;
33941284 598 _debug("cellname: [%u/%u] '%*.*s'",
5f2f9765
DH		 599 len, paddedlen, len, len, (const char *) xdr);
600 datalen -= paddedlen;
601 xdr += paddedlen >> 2;
33941284
DH		 602
603 /* get the token count */
604 if (datalen < 12)
605 goto not_xdr;
606 ntoken = ntohl(*xdr++);
607 datalen -= 4;
608 _debug("ntoken: %x", ntoken);
609 if (ntoken < 1 || ntoken > AFSTOKEN_MAX)
610 goto not_xdr;
611
612 /* check each token wrapper */
613 token = xdr;
614 loop = ntoken;
615 do {
616 if (datalen < 8)
617 goto not_xdr;
618 toklen = ntohl(*xdr++);
619 sec_ix = ntohl(*xdr);
620 datalen -= 4;
621 _debug("token: [%x/%zx] %x", toklen, datalen, sec_ix);
5f2f9765
DH		 622 paddedlen = (toklen + 3) & ~3;
623 if (toklen < 20 || toklen > datalen || paddedlen > datalen)
33941284 624 goto not_xdr;
5f2f9765
DH		 625 datalen -= paddedlen;
626 xdr += paddedlen >> 2;
33941284
DH		 627
628 } while (--loop > 0);
629
630 _debug("remainder: %zu", datalen);
631 if (datalen != 0)
632 goto not_xdr;
633
634 /* okay: we're going to assume it's valid XDR format
635 * - we ignore the cellname, relying on the key to be correctly named
636 */
637 do {
638 xdr = token;
639 toklen = ntohl(*xdr++);
640 token = xdr + ((toklen + 3) >> 2);
641 sec_ix = ntohl(*xdr++);
642 toklen -= 4;
643
99455153
DH		 644 _debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token);
645
33941284
DH		 646 switch (sec_ix) {
647 case RXRPC_SECURITY_RXKAD:
8a7a3eb4 648 ret = rxrpc_preparse_xdr_rxkad(prep, datalen, xdr, toklen);
33941284
DH		 649 if (ret != 0)
650 goto error;
651 break;
652
99455153 653 case RXRPC_SECURITY_RXK5:
8a7a3eb4 654 ret = rxrpc_preparse_xdr_rxk5(prep, datalen, xdr, toklen);
99455153
DH		 655 if (ret != 0)
656 goto error;
657 break;
658
33941284
DH		 659 default:
660 ret = -EPROTONOSUPPORT;
661 goto error;
662 }
663
664 } while (--ntoken > 0);
665
666 _leave(" = 0");
667 return 0;
668
669not_xdr:
670 _leave(" = -EPROTO");
671 return -EPROTO;
672error:
673 _leave(" = %d", ret);
674 return ret;
675}
676
17926a79 677/*
8a7a3eb4
DH		 678 * Preparse an rxrpc defined key.
679 *
680 * Data should be of the form:
17926a79
DH		 681 * OFFSET LEN CONTENT
682 * 0 4 key interface version number
683 * 4 2 security index (type)
684 * 6 2 ticket length
685 * 8 4 key expiry time (time_t)
686 * 12 4 kvno
687 * 16 8 session key
688 * 24 [len] ticket
689 *
690 * if no data is provided, then a no-security key is made
691 */
8a7a3eb4 692static int rxrpc_preparse(struct key_preparsed_payload *prep)
17926a79 693{
33941284
DH		 694 const struct rxrpc_key_data_v1 *v1;
695 struct rxrpc_key_token *token, **pp;
10674a03 696 time64_t expiry;
17926a79
DH		 697 size_t plen;
698 u32 kver;
699 int ret;
700
8a7a3eb4 701 _enter("%zu", prep->datalen);
17926a79
DH		 702
703 /* handle a no-security key */
cf7f601c 704 if (!prep->data && prep->datalen == 0)
17926a79
DH		 705 return 0;
706
33941284 707 /* determine if the XDR payload format is being used */
cf7f601c 708 if (prep->datalen > 7 * 4) {
8a7a3eb4 709 ret = rxrpc_preparse_xdr(prep);
33941284
DH		 710 if (ret != -EPROTO)
711 return ret;
712 }
713
17926a79
DH		 714 /* get the key interface version number */
715 ret = -EINVAL;
cf7f601c 716 if (prep->datalen <= 4 || !prep->data)
17926a79 717 goto error;
cf7f601c
DH		 718 memcpy(&kver, prep->data, sizeof(kver));
719 prep->data += sizeof(kver);
720 prep->datalen -= sizeof(kver);
17926a79
DH		 721
722 _debug("KEY I/F VERSION: %u", kver);
723
724 ret = -EKEYREJECTED;
725 if (kver != 1)
726 goto error;
727
728 /* deal with a version 1 key */
729 ret = -EINVAL;
cf7f601c 730 if (prep->datalen < sizeof(*v1))
17926a79
DH		 731 goto error;
732
cf7f601c
DH		 733 v1 = prep->data;
734 if (prep->datalen != sizeof(*v1) + v1->ticket_length)
17926a79
DH		 735 goto error;
736
33941284
DH		 737 _debug("SCIX: %u", v1->security_index);
738 _debug("TLEN: %u", v1->ticket_length);
739 _debug("EXPY: %x", v1->expiry);
740 _debug("KVNO: %u", v1->kvno);
17926a79 741 _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
33941284
DH		 742 v1->session_key[0], v1->session_key[1],
743 v1->session_key[2], v1->session_key[3],
744 v1->session_key[4], v1->session_key[5],
745 v1->session_key[6], v1->session_key[7]);
746 if (v1->ticket_length >= 8)
17926a79 747 _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
33941284
DH		 748 v1->ticket[0], v1->ticket[1],
749 v1->ticket[2], v1->ticket[3],
750 v1->ticket[4], v1->ticket[5],
751 v1->ticket[6], v1->ticket[7]);
17926a79
DH		 752
753 ret = -EPROTONOSUPPORT;
33941284 754 if (v1->security_index != RXRPC_SECURITY_RXKAD)
17926a79
DH		 755 goto error;
756
33941284 757 plen = sizeof(*token->kad) + v1->ticket_length;
8a7a3eb4 758 prep->quotalen = plen + sizeof(*token);
17926a79
DH		 759
760 ret = -ENOMEM;
0a93ea2e 761 token = kzalloc(sizeof(*token), GFP_KERNEL);
33941284 762 if (!token)
17926a79 763 goto error;
0a93ea2e 764 token->kad = kzalloc(plen, GFP_KERNEL);
33941284
DH		 765 if (!token->kad)
766 goto error_free;
767
768 token->security_index = RXRPC_SECURITY_RXKAD;
769 token->kad->ticket_len = v1->ticket_length;
770 token->kad->expiry = v1->expiry;
771 token->kad->kvno = v1->kvno;
772 memcpy(&token->kad->session_key, &v1->session_key, 8);
773 memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length);
17926a79 774
8a7a3eb4 775 /* count the number of tokens attached */
146aa8b1 776 prep->payload.data[1] = (void *)((unsigned long)prep->payload.data[1] + 1);
33941284 777
8a7a3eb4 778 /* attach the data */
146aa8b1 779 pp = (struct rxrpc_key_token **)&prep->payload.data[0];
33941284
DH		 780 while (*pp)
781 pp = &(*pp)->next;
782 *pp = token;
10674a03
BW		 783 expiry = rxrpc_u32_to_time64(token->kad->expiry);
784 if (expiry < prep->expiry)
785 prep->expiry = expiry;
33941284 786 token = NULL;
17926a79
DH		 787 ret = 0;
788
33941284
DH		 789error_free:
790 kfree(token);
17926a79
DH		 791error:
792 return ret;
793}
794
795/*
8a7a3eb4 796 * Free token list.
17926a79 797 */
8a7a3eb4
DH		 798static void rxrpc_free_token_list(struct rxrpc_key_token *token)
799{
800 struct rxrpc_key_token *next;
801
802 for (; token; token = next) {
803 next = token->next;
804 switch (token->security_index) {
805 case RXRPC_SECURITY_RXKAD:
806 kfree(token->kad);
807 break;
808 case RXRPC_SECURITY_RXK5:
809 if (token->k5)
810 rxrpc_rxk5_free(token->k5);
811 break;
812 default:
9b6d5398 813 pr_err("Unknown token type %x on rxrpc key\n",
8a7a3eb4
DH		 814 token->security_index);
815 BUG();
816 }
817
818 kfree(token);
819 }
820}
821
822/*
823 * Clean up preparse data.
824 */
825static void rxrpc_free_preparse(struct key_preparsed_payload *prep)
826{
146aa8b1 827 rxrpc_free_token_list(prep->payload.data[0]);
8a7a3eb4
DH		 828}
829
830/*
831 * Preparse a server secret key.
832 *
833 * The data should be the 8-byte secret key.
834 */
835static int rxrpc_preparse_s(struct key_preparsed_payload *prep)
17926a79 836{
1afe593b 837 struct crypto_skcipher *ci;
17926a79 838
8a7a3eb4 839 _enter("%zu", prep->datalen);
17926a79 840
cf7f601c 841 if (prep->datalen != 8)
17926a79
DH		 842 return -EINVAL;
843
146aa8b1 844 memcpy(&prep->payload.data[2], prep->data, 8);
17926a79 845
1afe593b 846 ci = crypto_alloc_skcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC);
17926a79
DH		 847 if (IS_ERR(ci)) {
848 _leave(" = %ld", PTR_ERR(ci));
849 return PTR_ERR(ci);
850 }
851
1afe593b 852 if (crypto_skcipher_setkey(ci, prep->data, 8) < 0)
17926a79
DH		 853 BUG();
854
146aa8b1 855 prep->payload.data[0] = ci;
17926a79
DH		 856 _leave(" = 0");
857 return 0;
858}
859
8a7a3eb4
DH		 860/*
861 * Clean up preparse data.
862 */
863static void rxrpc_free_preparse_s(struct key_preparsed_payload *prep)
864{
146aa8b1 865 if (prep->payload.data[0])
1afe593b 866 crypto_free_skcipher(prep->payload.data[0]);
8a7a3eb4
DH		 867}
868
17926a79
DH		 869/*
870 * dispose of the data dangling from the corpse of a rxrpc key
871 */
872static void rxrpc_destroy(struct key *key)
873{
146aa8b1 874 rxrpc_free_token_list(key->payload.data[0]);
17926a79
DH		 875}
876
877/*
878 * dispose of the data dangling from the corpse of a rxrpc key
879 */
880static void rxrpc_destroy_s(struct key *key)
881{
146aa8b1 882 if (key->payload.data[0]) {
1afe593b 883 crypto_free_skcipher(key->payload.data[0]);
146aa8b1 884 key->payload.data[0] = NULL;
17926a79
DH		 885 }
886}
887
888/*
889 * describe the rxrpc key
890 */
891static void rxrpc_describe(const struct key *key, struct seq_file *m)
892{
893 seq_puts(m, key->description);
894}
895
896/*
897 * grab the security key for a socket
898 */
899int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
900{
901 struct key *key;
902 char *description;
903
904 _enter("");
905
906 if (optlen <= 0 || optlen > PAGE_SIZE - 1)
907 return -EINVAL;
908
16e5c1fc
AV		 909 description = memdup_user_nul(optval, optlen);
910 if (IS_ERR(description))
911 return PTR_ERR(description);
17926a79 912
028db3e2 913 key = request_key_net(&key_type_rxrpc, description, sock_net(&rx->sk), NULL);
17926a79
DH		 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
16e5c1fc
AV		 940 description = memdup_user_nul(optval, optlen);
941 if (IS_ERR(description))
942 return PTR_ERR(description);
17926a79 943
028db3e2 944 key = request_key_net(&key_type_keyring, description, sock_net(&rx->sk), NULL);
17926a79
DH		 945 if (IS_ERR(key)) {
946 kfree(description);
947 _leave(" = %ld", PTR_ERR(key));
948 return PTR_ERR(key);
949 }
950
951 rx->securities = key;
952 kfree(description);
953 _leave(" = 0 [key %x]", key->serial);
954 return 0;
955}
956
957/*
958 * generate a server data key
959 */
960int rxrpc_get_server_data_key(struct rxrpc_connection *conn,
961 const void *session_key,
10674a03 962 time64_t expiry,
17926a79
DH		 963 u32 kvno)
964{
d84f4f99 965 const struct cred *cred = current_cred();
17926a79
DH		 966 struct key *key;
967 int ret;
968
969 struct {
970 u32 kver;
33941284 971 struct rxrpc_key_data_v1 v1;
17926a79
DH		 972 } data;
973
974 _enter("");
975
c6089735 976 key = key_alloc(&key_type_rxrpc, "x",
028db3e2 977 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, 0,
5ac7eace 978 KEY_ALLOC_NOT_IN_QUOTA, NULL);
17926a79
DH		 979 if (IS_ERR(key)) {
980 _leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key));
981 return -ENOMEM;
982 }
983
984 _debug("key %d", key_serial(key));
985
986 data.kver = 1;
33941284
DH		 987 data.v1.security_index = RXRPC_SECURITY_RXKAD;
988 data.v1.ticket_length = 0;
10674a03 989 data.v1.expiry = rxrpc_time64_to_u32(expiry);
33941284 990 data.v1.kvno = 0;
17926a79 991
33941284 992 memcpy(&data.v1.session_key, session_key, sizeof(data.v1.session_key));
17926a79
DH		 993
994 ret = key_instantiate_and_link(key, &data, sizeof(data), NULL, NULL);
995 if (ret < 0)
996 goto error;
997
19ffa01c 998 conn->params.key = key;
17926a79
DH		 999 _leave(" = 0 [%d]", key_serial(key));
1000 return 0;
1001
1002error:
1003 key_revoke(key);
1004 key_put(key);
1005 _leave(" = -ENOMEM [ins %d]", ret);
1006 return -ENOMEM;
1007}
17926a79 1008EXPORT_SYMBOL(rxrpc_get_server_data_key);
76181c13
DH		 1009
1010/**
1011 * rxrpc_get_null_key - Generate a null RxRPC key
1012 * @keyname: The name to give the key.
1013 *
1014 * Generate a null RxRPC key that can be used to indicate anonymous security is
1015 * required for a particular domain.
1016 */
1017struct key *rxrpc_get_null_key(const char *keyname)
1018{
d84f4f99 1019 const struct cred *cred = current_cred();
76181c13
DH		 1020 struct key *key;
1021 int ret;
1022
c6089735
EB		 1023 key = key_alloc(&key_type_rxrpc, keyname,
1024 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
028db3e2 1025 KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA, NULL);
76181c13
DH		 1026 if (IS_ERR(key))
1027 return key;
1028
1029 ret = key_instantiate_and_link(key, NULL, 0, NULL, NULL);
1030 if (ret < 0) {
1031 key_revoke(key);
1032 key_put(key);
1033 return ERR_PTR(ret);
1034 }
1035
1036 return key;
1037}
1038EXPORT_SYMBOL(rxrpc_get_null_key);
ed6dd18b
DH		 1039
1040/*
1041 * read the contents of an rxrpc key
1042 * - this returns the result in XDR form
1043 */
1044static long rxrpc_read(const struct key *key,
1045 char __user *buffer, size_t buflen)
1046{
99455153
DH		 1047 const struct rxrpc_key_token *token;
1048 const struct krb5_principal *princ;
1049 size_t size;
1050 __be32 __user *xdr, *oldxdr;
1051 u32 cnlen, toksize, ntoks, tok, zero;
1052 u16 toksizes[AFSTOKEN_MAX];
1053 int loop;
ed6dd18b
DH		 1054
1055 _enter("");
1056
1057 /* we don't know what form we should return non-AFS keys in */
1058 if (memcmp(key->description, "afs@", 4) != 0)
1059 return -EOPNOTSUPP;
1060 cnlen = strlen(key->description + 4);
1061
99455153
DH		 1062#define RND(X) (((X) + 3) & ~3)
1063
ed6dd18b
DH		 1064 /* AFS keys we return in XDR form, so we need to work out the size of
1065 * the XDR */
1066 size = 2 * 4; /* flags, cellname len */
99455153 1067 size += RND(cnlen); /* cellname */
ed6dd18b
DH		 1068 size += 1 * 4; /* token count */
1069
1070 ntoks = 0;
146aa8b1 1071 for (token = key->payload.data[0]; token; token = token->next) {
99455153
DH		 1072 toksize = 4; /* sec index */
1073
ed6dd18b
DH		 1074 switch (token->security_index) {
1075 case RXRPC_SECURITY_RXKAD:
774521f3 1076 toksize += 9 * 4; /* viceid, kvno, key*2 + len, begin,
99455153
DH		 1077 * end, primary, tktlen */
1078 toksize += RND(token->kad->ticket_len);
ed6dd18b
DH		 1079 break;
1080
99455153
DH		 1081 case RXRPC_SECURITY_RXK5:
1082 princ = &token->k5->client;
1083 toksize += 4 + princ->n_name_parts * 4;
1084 for (loop = 0; loop < princ->n_name_parts; loop++)
1085 toksize += RND(strlen(princ->name_parts[loop]));
1086 toksize += 4 + RND(strlen(princ->realm));
1087
1088 princ = &token->k5->server;
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 toksize += 8 + RND(token->k5->session.data_len);
1095
1096 toksize += 4 * 8 + 2 * 4;
1097
1098 toksize += 4 + token->k5->n_addresses * 8;
1099 for (loop = 0; loop < token->k5->n_addresses; loop++)
1100 toksize += RND(token->k5->addresses[loop].data_len);
1101
1102 toksize += 4 + RND(token->k5->ticket_len);
1103 toksize += 4 + RND(token->k5->ticket2_len);
1104
1105 toksize += 4 + token->k5->n_authdata * 8;
1106 for (loop = 0; loop < token->k5->n_authdata; loop++)
1107 toksize += RND(token->k5->authdata[loop].data_len);
ed6dd18b 1108 break;
99455153
DH		 1109
1110 default: /* we have a ticket we can't encode */
1111 BUG();
1112 continue;
ed6dd18b 1113 }
99455153
DH		 1114
1115 _debug("token[%u]: toksize=%u", ntoks, toksize);
1116 ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX);
1117
1118 toksizes[ntoks++] = toksize;
1119 size += toksize + 4; /* each token has a length word */
ed6dd18b
DH		 1120 }
1121
99455153
DH		 1122#undef RND
1123
ed6dd18b
DH		 1124 if (!buffer || buflen < size)
1125 return size;
1126
1127 xdr = (__be32 __user *) buffer;
1128 zero = 0;
1129#define ENCODE(x) \
1130 do { \
1131 __be32 y = htonl(x); \
1132 if (put_user(y, xdr++) < 0) \
1133 goto fault; \
1134 } while(0)
99455153
DH		 1135#define ENCODE_DATA(l, s) \
1136 do { \
1137 u32 _l = (l); \
1138 ENCODE(l); \
1139 if (copy_to_user(xdr, (s), _l) != 0) \
1140 goto fault; \
1141 if (_l & 3 && \
ed3bfdfd 1142 copy_to_user((u8 __user *)xdr + _l, &zero, 4 - (_l & 3)) != 0) \
99455153
DH		 1143 goto fault; \
1144 xdr += (_l + 3) >> 2; \
1145 } while(0)
1146#define ENCODE64(x) \
1147 do { \
1148 __be64 y = cpu_to_be64(x); \
1149 if (copy_to_user(xdr, &y, 8) != 0) \
1150 goto fault; \
1151 xdr += 8 >> 2; \
1152 } while(0)
1153#define ENCODE_STR(s) \
1154 do { \
1155 const char *_s = (s); \
1156 ENCODE_DATA(strlen(_s), _s); \
1157 } while(0)
ed6dd18b 1158
99455153
DH		 1159 ENCODE(0); /* flags */
1160 ENCODE_DATA(cnlen, key->description + 4); /* cellname */
1161 ENCODE(ntoks);
ed6dd18b 1162
99455153 1163 tok = 0;
146aa8b1 1164 for (token = key->payload.data[0]; token; token = token->next) {
99455153
DH		 1165 toksize = toksizes[tok++];
1166 ENCODE(toksize);
1167 oldxdr = xdr;
1168 ENCODE(token->security_index);
ed6dd18b
DH		 1169
1170 switch (token->security_index) {
1171 case RXRPC_SECURITY_RXKAD:
ed6dd18b
DH		 1172 ENCODE(token->kad->vice_id);
1173 ENCODE(token->kad->kvno);
99455153 1174 ENCODE_DATA(8, token->kad->session_key);
ed6dd18b
DH		 1175 ENCODE(token->kad->start);
1176 ENCODE(token->kad->expiry);
1177 ENCODE(token->kad->primary_flag);
99455153
DH		 1178 ENCODE_DATA(token->kad->ticket_len, token->kad->ticket);
1179 break;
1180
1181 case RXRPC_SECURITY_RXK5:
1182 princ = &token->k5->client;
1183 ENCODE(princ->n_name_parts);
1184 for (loop = 0; loop < princ->n_name_parts; loop++)
1185 ENCODE_STR(princ->name_parts[loop]);
1186 ENCODE_STR(princ->realm);
1187
1188 princ = &token->k5->server;
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 ENCODE(token->k5->session.tag);
1195 ENCODE_DATA(token->k5->session.data_len,
1196 token->k5->session.data);
1197
1198 ENCODE64(token->k5->authtime);
1199 ENCODE64(token->k5->starttime);
1200 ENCODE64(token->k5->endtime);
1201 ENCODE64(token->k5->renew_till);
1202 ENCODE(token->k5->is_skey);
1203 ENCODE(token->k5->flags);
1204
1205 ENCODE(token->k5->n_addresses);
1206 for (loop = 0; loop < token->k5->n_addresses; loop++) {
1207 ENCODE(token->k5->addresses[loop].tag);
1208 ENCODE_DATA(token->k5->addresses[loop].data_len,
1209 token->k5->addresses[loop].data);
1210 }
1211
1212 ENCODE_DATA(token->k5->ticket_len, token->k5->ticket);
1213 ENCODE_DATA(token->k5->ticket2_len, token->k5->ticket2);
1214
1215 ENCODE(token->k5->n_authdata);
1216 for (loop = 0; loop < token->k5->n_authdata; loop++) {
1217 ENCODE(token->k5->authdata[loop].tag);
1218 ENCODE_DATA(token->k5->authdata[loop].data_len,
1219 token->k5->authdata[loop].data);
1220 }
ed6dd18b
DH		 1221 break;
1222
1223 default:
99455153 1224 BUG();
ed6dd18b
DH		 1225 break;
1226 }
99455153
DH		 1227
1228 ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==,
1229 toksize);
ed6dd18b
DH		 1230 }
1231
99455153
DH		 1232#undef ENCODE_STR
1233#undef ENCODE_DATA
1234#undef ENCODE64
ed6dd18b
DH		 1235#undef ENCODE
1236
99455153 1237 ASSERTCMP(tok, ==, ntoks);
ed6dd18b
DH		 1238 ASSERTCMP((char __user *) xdr - buffer, ==, size);
1239 _leave(" = %zu", size);
1240 return size;
1241
1242fault:
1243 _leave(" = -EFAULT");
1244 return -EFAULT;
1245}
Linux 6.x block layer and io_uring tree(s)