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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 <net/sock.h> |
22 | #include <net/af_rxrpc.h> |
23 | #include <keys/rxrpc-type.h> |
24 | #include <keys/user-type.h> |
25 | #include "ar-internal.h" |
26 | |
27 | static int rxrpc_instantiate(struct key *, const void *, size_t); |
28 | static int rxrpc_instantiate_s(struct key *, const void *, size_t); |
29 | static void rxrpc_destroy(struct key *); |
30 | static void rxrpc_destroy_s(struct key *); |
31 | static void rxrpc_describe(const struct key *, struct seq_file *); |
32 | static long rxrpc_read(const struct key *, char __user *, size_t); |
33 | |
34 | /* |
35 | * rxrpc defined keys take an arbitrary string as the description and an |
36 | * arbitrary blob of data as the payload |
37 | */ |
38 | struct key_type key_type_rxrpc = { |
39 | .name = "rxrpc", |
40 | .instantiate = rxrpc_instantiate, |
41 | .match = user_match, |
42 | .destroy = rxrpc_destroy, |
43 | .describe = rxrpc_describe, |
44 | .read = rxrpc_read, |
45 | }; |
46 | EXPORT_SYMBOL(key_type_rxrpc); |
47 | |
48 | /* |
49 | * rxrpc server defined keys take "<serviceId>:<securityIndex>" as the |
50 | * description and an 8-byte decryption key as the payload |
51 | */ |
52 | struct key_type key_type_rxrpc_s = { |
53 | .name = "rxrpc_s", |
54 | .instantiate = rxrpc_instantiate_s, |
55 | .match = user_match, |
56 | .destroy = rxrpc_destroy_s, |
57 | .describe = rxrpc_describe, |
58 | }; |
59 | |
60 | /* |
61 | * parse an RxKAD type XDR format token |
62 | * - the caller guarantees we have at least 4 words |
63 | */ |
64 | static int rxrpc_instantiate_xdr_rxkad(struct key *key, const __be32 *xdr, |
65 | unsigned toklen) |
66 | { |
67 | struct rxrpc_key_token *token, **pptoken; |
68 | size_t plen; |
69 | u32 tktlen; |
70 | int ret; |
71 | |
72 | _enter(",{%x,%x,%x,%x},%u", |
73 | ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), |
74 | toklen); |
75 | |
76 | if (toklen <= 8 * 4) |
77 | return -EKEYREJECTED; |
78 | tktlen = ntohl(xdr[7]); |
79 | _debug("tktlen: %x", tktlen); |
80 | if (tktlen > AFSTOKEN_RK_TIX_MAX) |
81 | return -EKEYREJECTED; |
82 | if (8 * 4 + tktlen != toklen) |
83 | return -EKEYREJECTED; |
84 | |
85 | plen = sizeof(*token) + sizeof(*token->kad) + tktlen; |
86 | ret = key_payload_reserve(key, key->datalen + plen); |
87 | if (ret < 0) |
88 | return ret; |
89 | |
90 | plen -= sizeof(*token); |
91 | token = kmalloc(sizeof(*token), GFP_KERNEL); |
92 | if (!token) |
93 | return -ENOMEM; |
94 | |
95 | token->kad = kmalloc(plen, GFP_KERNEL); |
96 | if (!token->kad) { |
97 | kfree(token); |
98 | return -ENOMEM; |
99 | } |
100 | |
101 | token->security_index = RXRPC_SECURITY_RXKAD; |
102 | token->kad->ticket_len = tktlen; |
103 | token->kad->vice_id = ntohl(xdr[0]); |
104 | token->kad->kvno = ntohl(xdr[1]); |
105 | token->kad->start = ntohl(xdr[4]); |
106 | token->kad->expiry = ntohl(xdr[5]); |
107 | token->kad->primary_flag = ntohl(xdr[6]); |
108 | memcpy(&token->kad->session_key, &xdr[2], 8); |
109 | memcpy(&token->kad->ticket, &xdr[8], tktlen); |
110 | |
111 | _debug("SCIX: %u", token->security_index); |
112 | _debug("TLEN: %u", token->kad->ticket_len); |
113 | _debug("EXPY: %x", token->kad->expiry); |
114 | _debug("KVNO: %u", token->kad->kvno); |
115 | _debug("PRIM: %u", token->kad->primary_flag); |
116 | _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x", |
117 | token->kad->session_key[0], token->kad->session_key[1], |
118 | token->kad->session_key[2], token->kad->session_key[3], |
119 | token->kad->session_key[4], token->kad->session_key[5], |
120 | token->kad->session_key[6], token->kad->session_key[7]); |
121 | if (token->kad->ticket_len >= 8) |
122 | _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x", |
123 | token->kad->ticket[0], token->kad->ticket[1], |
124 | token->kad->ticket[2], token->kad->ticket[3], |
125 | token->kad->ticket[4], token->kad->ticket[5], |
126 | token->kad->ticket[6], token->kad->ticket[7]); |
127 | |
128 | /* count the number of tokens attached */ |
129 | key->type_data.x[0]++; |
130 | |
131 | /* attach the data */ |
132 | for (pptoken = (struct rxrpc_key_token **)&key->payload.data; |
133 | *pptoken; |
134 | pptoken = &(*pptoken)->next) |
135 | continue; |
136 | *pptoken = token; |
137 | if (token->kad->expiry < key->expiry) |
138 | key->expiry = token->kad->expiry; |
139 | |
140 | _leave(" = 0"); |
141 | return 0; |
142 | } |
143 | |
144 | static void rxrpc_free_krb5_principal(struct krb5_principal *princ) |
145 | { |
146 | int loop; |
147 | |
148 | if (princ->name_parts) { |
149 | for (loop = princ->n_name_parts - 1; loop >= 0; loop--) |
150 | kfree(princ->name_parts[loop]); |
151 | kfree(princ->name_parts); |
152 | } |
153 | kfree(princ->realm); |
154 | } |
155 | |
156 | static void rxrpc_free_krb5_tagged(struct krb5_tagged_data *td) |
157 | { |
158 | kfree(td->data); |
159 | } |
160 | |
161 | /* |
162 | * free up an RxK5 token |
163 | */ |
164 | static void rxrpc_rxk5_free(struct rxk5_key *rxk5) |
165 | { |
166 | int loop; |
167 | |
168 | rxrpc_free_krb5_principal(&rxk5->client); |
169 | rxrpc_free_krb5_principal(&rxk5->server); |
170 | rxrpc_free_krb5_tagged(&rxk5->session); |
171 | |
172 | if (rxk5->addresses) { |
173 | for (loop = rxk5->n_addresses - 1; loop >= 0; loop--) |
174 | rxrpc_free_krb5_tagged(&rxk5->addresses[loop]); |
175 | kfree(rxk5->addresses); |
176 | } |
177 | if (rxk5->authdata) { |
178 | for (loop = rxk5->n_authdata - 1; loop >= 0; loop--) |
179 | rxrpc_free_krb5_tagged(&rxk5->authdata[loop]); |
180 | kfree(rxk5->authdata); |
181 | } |
182 | |
183 | kfree(rxk5->ticket); |
184 | kfree(rxk5->ticket2); |
185 | kfree(rxk5); |
186 | } |
187 | |
188 | /* |
189 | * extract a krb5 principal |
190 | */ |
191 | static int rxrpc_krb5_decode_principal(struct krb5_principal *princ, |
192 | const __be32 **_xdr, |
193 | unsigned *_toklen) |
194 | { |
195 | const __be32 *xdr = *_xdr; |
196 | unsigned toklen = *_toklen, n_parts, loop, tmp; |
197 | |
198 | /* there must be at least one name, and at least #names+1 length |
199 | * words */ |
200 | if (toklen <= 12) |
201 | return -EINVAL; |
202 | |
203 | _enter(",{%x,%x,%x},%u", |
204 | ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), toklen); |
205 | |
206 | n_parts = ntohl(*xdr++); |
207 | toklen -= 4; |
208 | if (n_parts <= 0 || n_parts > AFSTOKEN_K5_COMPONENTS_MAX) |
209 | return -EINVAL; |
210 | princ->n_name_parts = n_parts; |
211 | |
212 | if (toklen <= (n_parts + 1) * 4) |
213 | return -EINVAL; |
214 | |
215 | princ->name_parts = kcalloc(sizeof(char *), n_parts, GFP_KERNEL); |
216 | if (!princ->name_parts) |
217 | return -ENOMEM; |
218 | |
219 | for (loop = 0; loop < n_parts; loop++) { |
220 | if (toklen < 4) |
221 | return -EINVAL; |
222 | tmp = ntohl(*xdr++); |
223 | toklen -= 4; |
224 | if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX) |
225 | return -EINVAL; |
226 | if (tmp > toklen) |
227 | return -EINVAL; |
228 | princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL); |
229 | if (!princ->name_parts[loop]) |
230 | return -ENOMEM; |
231 | memcpy(princ->name_parts[loop], xdr, tmp); |
232 | princ->name_parts[loop][tmp] = 0; |
233 | tmp = (tmp + 3) & ~3; |
234 | toklen -= tmp; |
235 | xdr += tmp >> 2; |
236 | } |
237 | |
238 | if (toklen < 4) |
239 | return -EINVAL; |
240 | tmp = ntohl(*xdr++); |
241 | toklen -= 4; |
242 | if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX) |
243 | return -EINVAL; |
244 | if (tmp > toklen) |
245 | return -EINVAL; |
246 | princ->realm = kmalloc(tmp + 1, GFP_KERNEL); |
247 | if (!princ->realm) |
248 | return -ENOMEM; |
249 | memcpy(princ->realm, xdr, tmp); |
250 | princ->realm[tmp] = 0; |
251 | tmp = (tmp + 3) & ~3; |
252 | toklen -= tmp; |
253 | xdr += tmp >> 2; |
254 | |
255 | _debug("%s/...@%s", princ->name_parts[0], princ->realm); |
256 | |
257 | *_xdr = xdr; |
258 | *_toklen = toklen; |
259 | _leave(" = 0 [toklen=%u]", toklen); |
260 | return 0; |
261 | } |
262 | |
263 | /* |
264 | * extract a piece of krb5 tagged data |
265 | */ |
266 | static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td, |
267 | size_t max_data_size, |
268 | const __be32 **_xdr, |
269 | unsigned *_toklen) |
270 | { |
271 | const __be32 *xdr = *_xdr; |
272 | unsigned toklen = *_toklen, len; |
273 | |
274 | /* there must be at least one tag and one length word */ |
275 | if (toklen <= 8) |
276 | return -EINVAL; |
277 | |
278 | _enter(",%zu,{%x,%x},%u", |
279 | max_data_size, ntohl(xdr[0]), ntohl(xdr[1]), toklen); |
280 | |
281 | td->tag = ntohl(*xdr++); |
282 | len = ntohl(*xdr++); |
283 | toklen -= 8; |
284 | if (len > max_data_size) |
285 | return -EINVAL; |
286 | td->data_len = len; |
287 | |
288 | if (len > 0) { |
289 | td->data = kmalloc(len, GFP_KERNEL); |
290 | if (!td->data) |
291 | return -ENOMEM; |
292 | memcpy(td->data, xdr, len); |
293 | len = (len + 3) & ~3; |
294 | toklen -= len; |
295 | xdr += len >> 2; |
296 | } |
297 | |
298 | _debug("tag %x len %x", td->tag, td->data_len); |
299 | |
300 | *_xdr = xdr; |
301 | *_toklen = toklen; |
302 | _leave(" = 0 [toklen=%u]", toklen); |
303 | return 0; |
304 | } |
305 | |
306 | /* |
307 | * extract an array of tagged data |
308 | */ |
309 | static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td, |
310 | u8 *_n_elem, |
311 | u8 max_n_elem, |
312 | size_t max_elem_size, |
313 | const __be32 **_xdr, |
314 | unsigned *_toklen) |
315 | { |
316 | struct krb5_tagged_data *td; |
317 | const __be32 *xdr = *_xdr; |
318 | unsigned toklen = *_toklen, n_elem, loop; |
319 | int ret; |
320 | |
321 | /* there must be at least one count */ |
322 | if (toklen < 4) |
323 | return -EINVAL; |
324 | |
325 | _enter(",,%u,%zu,{%x},%u", |
326 | max_n_elem, max_elem_size, ntohl(xdr[0]), toklen); |
327 | |
328 | n_elem = ntohl(*xdr++); |
329 | toklen -= 4; |
330 | if (n_elem < 0 || n_elem > max_n_elem) |
331 | return -EINVAL; |
332 | *_n_elem = n_elem; |
333 | if (n_elem > 0) { |
334 | if (toklen <= (n_elem + 1) * 4) |
335 | return -EINVAL; |
336 | |
337 | _debug("n_elem %d", n_elem); |
338 | |
339 | td = kcalloc(sizeof(struct krb5_tagged_data), n_elem, |
340 | GFP_KERNEL); |
341 | if (!td) |
342 | return -ENOMEM; |
343 | *_td = td; |
344 | |
345 | for (loop = 0; loop < n_elem; loop++) { |
346 | ret = rxrpc_krb5_decode_tagged_data(&td[loop], |
347 | max_elem_size, |
348 | &xdr, &toklen); |
349 | if (ret < 0) |
350 | return ret; |
351 | } |
352 | } |
353 | |
354 | *_xdr = xdr; |
355 | *_toklen = toklen; |
356 | _leave(" = 0 [toklen=%u]", toklen); |
357 | return 0; |
358 | } |
359 | |
360 | /* |
361 | * extract a krb5 ticket |
362 | */ |
363 | static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen, |
364 | const __be32 **_xdr, unsigned *_toklen) |
365 | { |
366 | const __be32 *xdr = *_xdr; |
367 | unsigned toklen = *_toklen, len; |
368 | |
369 | /* there must be at least one length word */ |
370 | if (toklen <= 4) |
371 | return -EINVAL; |
372 | |
373 | _enter(",{%x},%u", ntohl(xdr[0]), toklen); |
374 | |
375 | len = ntohl(*xdr++); |
376 | toklen -= 4; |
377 | if (len > AFSTOKEN_K5_TIX_MAX) |
378 | return -EINVAL; |
379 | *_tktlen = len; |
380 | |
381 | _debug("ticket len %u", len); |
382 | |
383 | if (len > 0) { |
384 | *_ticket = kmalloc(len, GFP_KERNEL); |
385 | if (!*_ticket) |
386 | return -ENOMEM; |
387 | memcpy(*_ticket, xdr, len); |
388 | len = (len + 3) & ~3; |
389 | toklen -= len; |
390 | xdr += len >> 2; |
391 | } |
392 | |
393 | *_xdr = xdr; |
394 | *_toklen = toklen; |
395 | _leave(" = 0 [toklen=%u]", toklen); |
396 | return 0; |
397 | } |
398 | |
399 | /* |
400 | * parse an RxK5 type XDR format token |
401 | * - the caller guarantees we have at least 4 words |
402 | */ |
403 | static int rxrpc_instantiate_xdr_rxk5(struct key *key, const __be32 *xdr, |
404 | unsigned toklen) |
405 | { |
406 | struct rxrpc_key_token *token, **pptoken; |
407 | struct rxk5_key *rxk5; |
408 | const __be32 *end_xdr = xdr + (toklen >> 2); |
409 | int ret; |
410 | |
411 | _enter(",{%x,%x,%x,%x},%u", |
412 | ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), |
413 | toklen); |
414 | |
415 | /* reserve some payload space for this subkey - the length of the token |
416 | * is a reasonable approximation */ |
417 | ret = key_payload_reserve(key, key->datalen + toklen); |
418 | if (ret < 0) |
419 | return ret; |
420 | |
421 | token = kzalloc(sizeof(*token), GFP_KERNEL); |
422 | if (!token) |
423 | return -ENOMEM; |
424 | |
425 | rxk5 = kzalloc(sizeof(*rxk5), GFP_KERNEL); |
426 | if (!rxk5) { |
427 | kfree(token); |
428 | return -ENOMEM; |
429 | } |
430 | |
431 | token->security_index = RXRPC_SECURITY_RXK5; |
432 | token->k5 = rxk5; |
433 | |
434 | /* extract the principals */ |
435 | ret = rxrpc_krb5_decode_principal(&rxk5->client, &xdr, &toklen); |
436 | if (ret < 0) |
437 | goto error; |
438 | ret = rxrpc_krb5_decode_principal(&rxk5->server, &xdr, &toklen); |
439 | if (ret < 0) |
440 | goto error; |
441 | |
442 | /* extract the session key and the encoding type (the tag field -> |
443 | * ENCTYPE_xxx) */ |
444 | ret = rxrpc_krb5_decode_tagged_data(&rxk5->session, AFSTOKEN_DATA_MAX, |
445 | &xdr, &toklen); |
446 | if (ret < 0) |
447 | goto error; |
448 | |
449 | if (toklen < 4 * 8 + 2 * 4) |
450 | goto inval; |
451 | rxk5->authtime = be64_to_cpup((const __be64 *) xdr); |
452 | xdr += 2; |
453 | rxk5->starttime = be64_to_cpup((const __be64 *) xdr); |
454 | xdr += 2; |
455 | rxk5->endtime = be64_to_cpup((const __be64 *) xdr); |
456 | xdr += 2; |
457 | rxk5->renew_till = be64_to_cpup((const __be64 *) xdr); |
458 | xdr += 2; |
459 | rxk5->is_skey = ntohl(*xdr++); |
460 | rxk5->flags = ntohl(*xdr++); |
461 | toklen -= 4 * 8 + 2 * 4; |
462 | |
463 | _debug("times: a=%llx s=%llx e=%llx rt=%llx", |
464 | rxk5->authtime, rxk5->starttime, rxk5->endtime, |
465 | rxk5->renew_till); |
466 | _debug("is_skey=%x flags=%x", rxk5->is_skey, rxk5->flags); |
467 | |
468 | /* extract the permitted client addresses */ |
469 | ret = rxrpc_krb5_decode_tagged_array(&rxk5->addresses, |
470 | &rxk5->n_addresses, |
471 | AFSTOKEN_K5_ADDRESSES_MAX, |
472 | AFSTOKEN_DATA_MAX, |
473 | &xdr, &toklen); |
474 | if (ret < 0) |
475 | goto error; |
476 | |
477 | ASSERTCMP((end_xdr - xdr) << 2, ==, toklen); |
478 | |
479 | /* extract the tickets */ |
480 | ret = rxrpc_krb5_decode_ticket(&rxk5->ticket, &rxk5->ticket_len, |
481 | &xdr, &toklen); |
482 | if (ret < 0) |
483 | goto error; |
484 | ret = rxrpc_krb5_decode_ticket(&rxk5->ticket2, &rxk5->ticket2_len, |
485 | &xdr, &toklen); |
486 | if (ret < 0) |
487 | goto error; |
488 | |
489 | ASSERTCMP((end_xdr - xdr) << 2, ==, toklen); |
490 | |
491 | /* extract the typed auth data */ |
492 | ret = rxrpc_krb5_decode_tagged_array(&rxk5->authdata, |
493 | &rxk5->n_authdata, |
494 | AFSTOKEN_K5_AUTHDATA_MAX, |
495 | AFSTOKEN_BDATALN_MAX, |
496 | &xdr, &toklen); |
497 | if (ret < 0) |
498 | goto error; |
499 | |
500 | ASSERTCMP((end_xdr - xdr) << 2, ==, toklen); |
501 | |
502 | if (toklen != 0) |
503 | goto inval; |
504 | |
505 | /* attach the payload to the key */ |
506 | for (pptoken = (struct rxrpc_key_token **)&key->payload.data; |
507 | *pptoken; |
508 | pptoken = &(*pptoken)->next) |
509 | continue; |
510 | *pptoken = token; |
511 | if (token->kad->expiry < key->expiry) |
512 | key->expiry = token->kad->expiry; |
513 | |
514 | _leave(" = 0"); |
515 | return 0; |
516 | |
517 | inval: |
518 | ret = -EINVAL; |
519 | error: |
520 | rxrpc_rxk5_free(rxk5); |
521 | kfree(token); |
522 | _leave(" = %d", ret); |
523 | return ret; |
524 | } |
525 | |
526 | /* |
527 | * attempt to parse the data as the XDR format |
528 | * - the caller guarantees we have more than 7 words |
529 | */ |
530 | static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datalen) |
531 | { |
532 | const __be32 *xdr = data, *token; |
533 | const char *cp; |
534 | unsigned len, tmp, loop, ntoken, toklen, sec_ix; |
535 | int ret; |
536 | |
537 | _enter(",{%x,%x,%x,%x},%zu", |
538 | ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), |
539 | datalen); |
540 | |
541 | if (datalen > AFSTOKEN_LENGTH_MAX) |
542 | goto not_xdr; |
543 | |
544 | /* XDR is an array of __be32's */ |
545 | if (datalen & 3) |
546 | goto not_xdr; |
547 | |
548 | /* the flags should be 0 (the setpag bit must be handled by |
549 | * userspace) */ |
550 | if (ntohl(*xdr++) != 0) |
551 | goto not_xdr; |
552 | datalen -= 4; |
553 | |
554 | /* check the cell name */ |
555 | len = ntohl(*xdr++); |
556 | if (len < 1 || len > AFSTOKEN_CELL_MAX) |
557 | goto not_xdr; |
558 | datalen -= 4; |
559 | tmp = (len + 3) & ~3; |
560 | if (tmp > datalen) |
561 | goto not_xdr; |
562 | |
563 | cp = (const char *) xdr; |
564 | for (loop = 0; loop < len; loop++) |
565 | if (!isprint(cp[loop])) |
566 | goto not_xdr; |
567 | if (len < tmp) |
568 | for (; loop < tmp; loop++) |
569 | if (cp[loop]) |
570 | goto not_xdr; |
571 | _debug("cellname: [%u/%u] '%*.*s'", |
572 | len, tmp, len, len, (const char *) xdr); |
573 | datalen -= tmp; |
574 | xdr += tmp >> 2; |
575 | |
576 | /* get the token count */ |
577 | if (datalen < 12) |
578 | goto not_xdr; |
579 | ntoken = ntohl(*xdr++); |
580 | datalen -= 4; |
581 | _debug("ntoken: %x", ntoken); |
582 | if (ntoken < 1 || ntoken > AFSTOKEN_MAX) |
583 | goto not_xdr; |
584 | |
585 | /* check each token wrapper */ |
586 | token = xdr; |
587 | loop = ntoken; |
588 | do { |
589 | if (datalen < 8) |
590 | goto not_xdr; |
591 | toklen = ntohl(*xdr++); |
592 | sec_ix = ntohl(*xdr); |
593 | datalen -= 4; |
594 | _debug("token: [%x/%zx] %x", toklen, datalen, sec_ix); |
595 | if (toklen < 20 || toklen > datalen) |
596 | goto not_xdr; |
597 | datalen -= (toklen + 3) & ~3; |
598 | xdr += (toklen + 3) >> 2; |
599 | |
600 | } while (--loop > 0); |
601 | |
602 | _debug("remainder: %zu", datalen); |
603 | if (datalen != 0) |
604 | goto not_xdr; |
605 | |
606 | /* okay: we're going to assume it's valid XDR format |
607 | * - we ignore the cellname, relying on the key to be correctly named |
608 | */ |
609 | do { |
610 | xdr = token; |
611 | toklen = ntohl(*xdr++); |
612 | token = xdr + ((toklen + 3) >> 2); |
613 | sec_ix = ntohl(*xdr++); |
614 | toklen -= 4; |
615 | |
616 | _debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token); |
617 | |
618 | switch (sec_ix) { |
619 | case RXRPC_SECURITY_RXKAD: |
620 | ret = rxrpc_instantiate_xdr_rxkad(key, xdr, toklen); |
621 | if (ret != 0) |
622 | goto error; |
623 | break; |
624 | |
625 | case RXRPC_SECURITY_RXK5: |
626 | ret = rxrpc_instantiate_xdr_rxk5(key, xdr, toklen); |
627 | if (ret != 0) |
628 | goto error; |
629 | break; |
630 | |
631 | default: |
632 | ret = -EPROTONOSUPPORT; |
633 | goto error; |
634 | } |
635 | |
636 | } while (--ntoken > 0); |
637 | |
638 | _leave(" = 0"); |
639 | return 0; |
640 | |
641 | not_xdr: |
642 | _leave(" = -EPROTO"); |
643 | return -EPROTO; |
644 | error: |
645 | _leave(" = %d", ret); |
646 | return ret; |
647 | } |
648 | |
649 | /* |
650 | * instantiate an rxrpc defined key |
651 | * data should be of the form: |
652 | * OFFSET LEN CONTENT |
653 | * 0 4 key interface version number |
654 | * 4 2 security index (type) |
655 | * 6 2 ticket length |
656 | * 8 4 key expiry time (time_t) |
657 | * 12 4 kvno |
658 | * 16 8 session key |
659 | * 24 [len] ticket |
660 | * |
661 | * if no data is provided, then a no-security key is made |
662 | */ |
663 | static int rxrpc_instantiate(struct key *key, const void *data, size_t datalen) |
664 | { |
665 | const struct rxrpc_key_data_v1 *v1; |
666 | struct rxrpc_key_token *token, **pp; |
667 | size_t plen; |
668 | u32 kver; |
669 | int ret; |
670 | |
671 | _enter("{%x},,%zu", key_serial(key), datalen); |
672 | |
673 | /* handle a no-security key */ |
674 | if (!data && datalen == 0) |
675 | return 0; |
676 | |
677 | /* determine if the XDR payload format is being used */ |
678 | if (datalen > 7 * 4) { |
679 | ret = rxrpc_instantiate_xdr(key, data, datalen); |
680 | if (ret != -EPROTO) |
681 | return ret; |
682 | } |
683 | |
684 | /* get the key interface version number */ |
685 | ret = -EINVAL; |
686 | if (datalen <= 4 || !data) |
687 | goto error; |
688 | memcpy(&kver, data, sizeof(kver)); |
689 | data += sizeof(kver); |
690 | datalen -= sizeof(kver); |
691 | |
692 | _debug("KEY I/F VERSION: %u", kver); |
693 | |
694 | ret = -EKEYREJECTED; |
695 | if (kver != 1) |
696 | goto error; |
697 | |
698 | /* deal with a version 1 key */ |
699 | ret = -EINVAL; |
700 | if (datalen < sizeof(*v1)) |
701 | goto error; |
702 | |
703 | v1 = data; |
704 | if (datalen != sizeof(*v1) + v1->ticket_length) |
705 | goto error; |
706 | |
707 | _debug("SCIX: %u", v1->security_index); |
708 | _debug("TLEN: %u", v1->ticket_length); |
709 | _debug("EXPY: %x", v1->expiry); |
710 | _debug("KVNO: %u", v1->kvno); |
711 | _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x", |
712 | v1->session_key[0], v1->session_key[1], |
713 | v1->session_key[2], v1->session_key[3], |
714 | v1->session_key[4], v1->session_key[5], |
715 | v1->session_key[6], v1->session_key[7]); |
716 | if (v1->ticket_length >= 8) |
717 | _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x", |
718 | v1->ticket[0], v1->ticket[1], |
719 | v1->ticket[2], v1->ticket[3], |
720 | v1->ticket[4], v1->ticket[5], |
721 | v1->ticket[6], v1->ticket[7]); |
722 | |
723 | ret = -EPROTONOSUPPORT; |
724 | if (v1->security_index != RXRPC_SECURITY_RXKAD) |
725 | goto error; |
726 | |
727 | plen = sizeof(*token->kad) + v1->ticket_length; |
728 | ret = key_payload_reserve(key, plen + sizeof(*token)); |
729 | if (ret < 0) |
730 | goto error; |
731 | |
732 | ret = -ENOMEM; |
733 | token = kmalloc(sizeof(*token), GFP_KERNEL); |
734 | if (!token) |
735 | goto error; |
736 | token->kad = kmalloc(plen, GFP_KERNEL); |
737 | if (!token->kad) |
738 | goto error_free; |
739 | |
740 | token->security_index = RXRPC_SECURITY_RXKAD; |
741 | token->kad->ticket_len = v1->ticket_length; |
742 | token->kad->expiry = v1->expiry; |
743 | token->kad->kvno = v1->kvno; |
744 | memcpy(&token->kad->session_key, &v1->session_key, 8); |
745 | memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length); |
746 | |
747 | /* attach the data */ |
748 | key->type_data.x[0]++; |
749 | |
750 | pp = (struct rxrpc_key_token **)&key->payload.data; |
751 | while (*pp) |
752 | pp = &(*pp)->next; |
753 | *pp = token; |
754 | if (token->kad->expiry < key->expiry) |
755 | key->expiry = token->kad->expiry; |
756 | token = NULL; |
757 | ret = 0; |
758 | |
759 | error_free: |
760 | kfree(token); |
761 | error: |
762 | return ret; |
763 | } |
764 | |
765 | /* |
766 | * instantiate a server secret key |
767 | * data should be a pointer to the 8-byte secret key |
768 | */ |
769 | static int rxrpc_instantiate_s(struct key *key, const void *data, |
770 | size_t datalen) |
771 | { |
772 | struct crypto_blkcipher *ci; |
773 | |
774 | _enter("{%x},,%zu", key_serial(key), datalen); |
775 | |
776 | if (datalen != 8) |
777 | return -EINVAL; |
778 | |
779 | memcpy(&key->type_data, data, 8); |
780 | |
781 | ci = crypto_alloc_blkcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC); |
782 | if (IS_ERR(ci)) { |
783 | _leave(" = %ld", PTR_ERR(ci)); |
784 | return PTR_ERR(ci); |
785 | } |
786 | |
787 | if (crypto_blkcipher_setkey(ci, data, 8) < 0) |
788 | BUG(); |
789 | |
790 | key->payload.data = ci; |
791 | _leave(" = 0"); |
792 | return 0; |
793 | } |
794 | |
795 | /* |
796 | * dispose of the data dangling from the corpse of a rxrpc key |
797 | */ |
798 | static void rxrpc_destroy(struct key *key) |
799 | { |
800 | struct rxrpc_key_token *token; |
801 | |
802 | while ((token = key->payload.data)) { |
803 | key->payload.data = 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: |
813 | printk(KERN_ERR "Unknown token type %x on rxrpc key\n", |
814 | token->security_index); |
815 | BUG(); |
816 | } |
817 | |
818 | kfree(token); |
819 | } |
820 | } |
821 | |
822 | /* |
823 | * dispose of the data dangling from the corpse of a rxrpc key |
824 | */ |
825 | static void rxrpc_destroy_s(struct key *key) |
826 | { |
827 | if (key->payload.data) { |
828 | crypto_free_blkcipher(key->payload.data); |
829 | key->payload.data = NULL; |
830 | } |
831 | } |
832 | |
833 | /* |
834 | * describe the rxrpc key |
835 | */ |
836 | static void rxrpc_describe(const struct key *key, struct seq_file *m) |
837 | { |
838 | seq_puts(m, key->description); |
839 | } |
840 | |
841 | /* |
842 | * grab the security key for a socket |
843 | */ |
844 | int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen) |
845 | { |
846 | struct key *key; |
847 | char *description; |
848 | |
849 | _enter(""); |
850 | |
851 | if (optlen <= 0 || optlen > PAGE_SIZE - 1) |
852 | return -EINVAL; |
853 | |
854 | description = kmalloc(optlen + 1, GFP_KERNEL); |
855 | if (!description) |
856 | return -ENOMEM; |
857 | |
858 | if (copy_from_user(description, optval, optlen)) { |
859 | kfree(description); |
860 | return -EFAULT; |
861 | } |
862 | description[optlen] = 0; |
863 | |
864 | key = request_key(&key_type_rxrpc, description, NULL); |
865 | if (IS_ERR(key)) { |
866 | kfree(description); |
867 | _leave(" = %ld", PTR_ERR(key)); |
868 | return PTR_ERR(key); |
869 | } |
870 | |
871 | rx->key = key; |
872 | kfree(description); |
873 | _leave(" = 0 [key %x]", key->serial); |
874 | return 0; |
875 | } |
876 | |
877 | /* |
878 | * grab the security keyring for a server socket |
879 | */ |
880 | int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval, |
881 | int optlen) |
882 | { |
883 | struct key *key; |
884 | char *description; |
885 | |
886 | _enter(""); |
887 | |
888 | if (optlen <= 0 || optlen > PAGE_SIZE - 1) |
889 | return -EINVAL; |
890 | |
891 | description = kmalloc(optlen + 1, GFP_KERNEL); |
892 | if (!description) |
893 | return -ENOMEM; |
894 | |
895 | if (copy_from_user(description, optval, optlen)) { |
896 | kfree(description); |
897 | return -EFAULT; |
898 | } |
899 | description[optlen] = 0; |
900 | |
901 | key = request_key(&key_type_keyring, description, NULL); |
902 | if (IS_ERR(key)) { |
903 | kfree(description); |
904 | _leave(" = %ld", PTR_ERR(key)); |
905 | return PTR_ERR(key); |
906 | } |
907 | |
908 | rx->securities = key; |
909 | kfree(description); |
910 | _leave(" = 0 [key %x]", key->serial); |
911 | return 0; |
912 | } |
913 | |
914 | /* |
915 | * generate a server data key |
916 | */ |
917 | int rxrpc_get_server_data_key(struct rxrpc_connection *conn, |
918 | const void *session_key, |
919 | time_t expiry, |
920 | u32 kvno) |
921 | { |
922 | const struct cred *cred = current_cred(); |
923 | struct key *key; |
924 | int ret; |
925 | |
926 | struct { |
927 | u32 kver; |
928 | struct rxrpc_key_data_v1 v1; |
929 | } data; |
930 | |
931 | _enter(""); |
932 | |
933 | key = key_alloc(&key_type_rxrpc, "x", 0, 0, cred, 0, |
934 | KEY_ALLOC_NOT_IN_QUOTA); |
935 | if (IS_ERR(key)) { |
936 | _leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key)); |
937 | return -ENOMEM; |
938 | } |
939 | |
940 | _debug("key %d", key_serial(key)); |
941 | |
942 | data.kver = 1; |
943 | data.v1.security_index = RXRPC_SECURITY_RXKAD; |
944 | data.v1.ticket_length = 0; |
945 | data.v1.expiry = expiry; |
946 | data.v1.kvno = 0; |
947 | |
948 | memcpy(&data.v1.session_key, session_key, sizeof(data.v1.session_key)); |
949 | |
950 | ret = key_instantiate_and_link(key, &data, sizeof(data), NULL, NULL); |
951 | if (ret < 0) |
952 | goto error; |
953 | |
954 | conn->key = key; |
955 | _leave(" = 0 [%d]", key_serial(key)); |
956 | return 0; |
957 | |
958 | error: |
959 | key_revoke(key); |
960 | key_put(key); |
961 | _leave(" = -ENOMEM [ins %d]", ret); |
962 | return -ENOMEM; |
963 | } |
964 | EXPORT_SYMBOL(rxrpc_get_server_data_key); |
965 | |
966 | /** |
967 | * rxrpc_get_null_key - Generate a null RxRPC key |
968 | * @keyname: The name to give the key. |
969 | * |
970 | * Generate a null RxRPC key that can be used to indicate anonymous security is |
971 | * required for a particular domain. |
972 | */ |
973 | struct key *rxrpc_get_null_key(const char *keyname) |
974 | { |
975 | const struct cred *cred = current_cred(); |
976 | struct key *key; |
977 | int ret; |
978 | |
979 | key = key_alloc(&key_type_rxrpc, keyname, 0, 0, cred, |
980 | KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA); |
981 | if (IS_ERR(key)) |
982 | return key; |
983 | |
984 | ret = key_instantiate_and_link(key, NULL, 0, NULL, NULL); |
985 | if (ret < 0) { |
986 | key_revoke(key); |
987 | key_put(key); |
988 | return ERR_PTR(ret); |
989 | } |
990 | |
991 | return key; |
992 | } |
993 | EXPORT_SYMBOL(rxrpc_get_null_key); |
994 | |
995 | /* |
996 | * read the contents of an rxrpc key |
997 | * - this returns the result in XDR form |
998 | */ |
999 | static long rxrpc_read(const struct key *key, |
1000 | char __user *buffer, size_t buflen) |
1001 | { |
1002 | const struct rxrpc_key_token *token; |
1003 | const struct krb5_principal *princ; |
1004 | size_t size; |
1005 | __be32 __user *xdr, *oldxdr; |
1006 | u32 cnlen, toksize, ntoks, tok, zero; |
1007 | u16 toksizes[AFSTOKEN_MAX]; |
1008 | int loop; |
1009 | |
1010 | _enter(""); |
1011 | |
1012 | /* we don't know what form we should return non-AFS keys in */ |
1013 | if (memcmp(key->description, "afs@", 4) != 0) |
1014 | return -EOPNOTSUPP; |
1015 | cnlen = strlen(key->description + 4); |
1016 | |
1017 | #define RND(X) (((X) + 3) & ~3) |
1018 | |
1019 | /* AFS keys we return in XDR form, so we need to work out the size of |
1020 | * the XDR */ |
1021 | size = 2 * 4; /* flags, cellname len */ |
1022 | size += RND(cnlen); /* cellname */ |
1023 | size += 1 * 4; /* token count */ |
1024 | |
1025 | ntoks = 0; |
1026 | for (token = key->payload.data; token; token = token->next) { |
1027 | toksize = 4; /* sec index */ |
1028 | |
1029 | switch (token->security_index) { |
1030 | case RXRPC_SECURITY_RXKAD: |
1031 | toksize += 8 * 4; /* viceid, kvno, key*2, begin, |
1032 | * end, primary, tktlen */ |
1033 | toksize += RND(token->kad->ticket_len); |
1034 | break; |
1035 | |
1036 | case RXRPC_SECURITY_RXK5: |
1037 | princ = &token->k5->client; |
1038 | toksize += 4 + princ->n_name_parts * 4; |
1039 | for (loop = 0; loop < princ->n_name_parts; loop++) |
1040 | toksize += RND(strlen(princ->name_parts[loop])); |
1041 | toksize += 4 + RND(strlen(princ->realm)); |
1042 | |
1043 | princ = &token->k5->server; |
1044 | toksize += 4 + princ->n_name_parts * 4; |
1045 | for (loop = 0; loop < princ->n_name_parts; loop++) |
1046 | toksize += RND(strlen(princ->name_parts[loop])); |
1047 | toksize += 4 + RND(strlen(princ->realm)); |
1048 | |
1049 | toksize += 8 + RND(token->k5->session.data_len); |
1050 | |
1051 | toksize += 4 * 8 + 2 * 4; |
1052 | |
1053 | toksize += 4 + token->k5->n_addresses * 8; |
1054 | for (loop = 0; loop < token->k5->n_addresses; loop++) |
1055 | toksize += RND(token->k5->addresses[loop].data_len); |
1056 | |
1057 | toksize += 4 + RND(token->k5->ticket_len); |
1058 | toksize += 4 + RND(token->k5->ticket2_len); |
1059 | |
1060 | toksize += 4 + token->k5->n_authdata * 8; |
1061 | for (loop = 0; loop < token->k5->n_authdata; loop++) |
1062 | toksize += RND(token->k5->authdata[loop].data_len); |
1063 | break; |
1064 | |
1065 | default: /* we have a ticket we can't encode */ |
1066 | BUG(); |
1067 | continue; |
1068 | } |
1069 | |
1070 | _debug("token[%u]: toksize=%u", ntoks, toksize); |
1071 | ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX); |
1072 | |
1073 | toksizes[ntoks++] = toksize; |
1074 | size += toksize + 4; /* each token has a length word */ |
1075 | } |
1076 | |
1077 | #undef RND |
1078 | |
1079 | if (!buffer || buflen < size) |
1080 | return size; |
1081 | |
1082 | xdr = (__be32 __user *) buffer; |
1083 | zero = 0; |
1084 | #define ENCODE(x) \ |
1085 | do { \ |
1086 | __be32 y = htonl(x); \ |
1087 | if (put_user(y, xdr++) < 0) \ |
1088 | goto fault; \ |
1089 | } while(0) |
1090 | #define ENCODE_DATA(l, s) \ |
1091 | do { \ |
1092 | u32 _l = (l); \ |
1093 | ENCODE(l); \ |
1094 | if (copy_to_user(xdr, (s), _l) != 0) \ |
1095 | goto fault; \ |
1096 | if (_l & 3 && \ |
1097 | copy_to_user((u8 *)xdr + _l, &zero, 4 - (_l & 3)) != 0) \ |
1098 | goto fault; \ |
1099 | xdr += (_l + 3) >> 2; \ |
1100 | } while(0) |
1101 | #define ENCODE64(x) \ |
1102 | do { \ |
1103 | __be64 y = cpu_to_be64(x); \ |
1104 | if (copy_to_user(xdr, &y, 8) != 0) \ |
1105 | goto fault; \ |
1106 | xdr += 8 >> 2; \ |
1107 | } while(0) |
1108 | #define ENCODE_STR(s) \ |
1109 | do { \ |
1110 | const char *_s = (s); \ |
1111 | ENCODE_DATA(strlen(_s), _s); \ |
1112 | } while(0) |
1113 | |
1114 | ENCODE(0); /* flags */ |
1115 | ENCODE_DATA(cnlen, key->description + 4); /* cellname */ |
1116 | ENCODE(ntoks); |
1117 | |
1118 | tok = 0; |
1119 | for (token = key->payload.data; token; token = token->next) { |
1120 | toksize = toksizes[tok++]; |
1121 | ENCODE(toksize); |
1122 | oldxdr = xdr; |
1123 | ENCODE(token->security_index); |
1124 | |
1125 | switch (token->security_index) { |
1126 | case RXRPC_SECURITY_RXKAD: |
1127 | ENCODE(token->kad->vice_id); |
1128 | ENCODE(token->kad->kvno); |
1129 | ENCODE_DATA(8, token->kad->session_key); |
1130 | ENCODE(token->kad->start); |
1131 | ENCODE(token->kad->expiry); |
1132 | ENCODE(token->kad->primary_flag); |
1133 | ENCODE_DATA(token->kad->ticket_len, token->kad->ticket); |
1134 | break; |
1135 | |
1136 | case RXRPC_SECURITY_RXK5: |
1137 | princ = &token->k5->client; |
1138 | ENCODE(princ->n_name_parts); |
1139 | for (loop = 0; loop < princ->n_name_parts; loop++) |
1140 | ENCODE_STR(princ->name_parts[loop]); |
1141 | ENCODE_STR(princ->realm); |
1142 | |
1143 | princ = &token->k5->server; |
1144 | ENCODE(princ->n_name_parts); |
1145 | for (loop = 0; loop < princ->n_name_parts; loop++) |
1146 | ENCODE_STR(princ->name_parts[loop]); |
1147 | ENCODE_STR(princ->realm); |
1148 | |
1149 | ENCODE(token->k5->session.tag); |
1150 | ENCODE_DATA(token->k5->session.data_len, |
1151 | token->k5->session.data); |
1152 | |
1153 | ENCODE64(token->k5->authtime); |
1154 | ENCODE64(token->k5->starttime); |
1155 | ENCODE64(token->k5->endtime); |
1156 | ENCODE64(token->k5->renew_till); |
1157 | ENCODE(token->k5->is_skey); |
1158 | ENCODE(token->k5->flags); |
1159 | |
1160 | ENCODE(token->k5->n_addresses); |
1161 | for (loop = 0; loop < token->k5->n_addresses; loop++) { |
1162 | ENCODE(token->k5->addresses[loop].tag); |
1163 | ENCODE_DATA(token->k5->addresses[loop].data_len, |
1164 | token->k5->addresses[loop].data); |
1165 | } |
1166 | |
1167 | ENCODE_DATA(token->k5->ticket_len, token->k5->ticket); |
1168 | ENCODE_DATA(token->k5->ticket2_len, token->k5->ticket2); |
1169 | |
1170 | ENCODE(token->k5->n_authdata); |
1171 | for (loop = 0; loop < token->k5->n_authdata; loop++) { |
1172 | ENCODE(token->k5->authdata[loop].tag); |
1173 | ENCODE_DATA(token->k5->authdata[loop].data_len, |
1174 | token->k5->authdata[loop].data); |
1175 | } |
1176 | break; |
1177 | |
1178 | default: |
1179 | BUG(); |
1180 | break; |
1181 | } |
1182 | |
1183 | ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==, |
1184 | toksize); |
1185 | } |
1186 | |
1187 | #undef ENCODE_STR |
1188 | #undef ENCODE_DATA |
1189 | #undef ENCODE64 |
1190 | #undef ENCODE |
1191 | |
1192 | ASSERTCMP(tok, ==, ntoks); |
1193 | ASSERTCMP((char __user *) xdr - buffer, ==, size); |
1194 | _leave(" = %zu", size); |
1195 | return size; |
1196 | |
1197 | fault: |
1198 | _leave(" = -EFAULT"); |
1199 | return -EFAULT; |
1200 | } |
1201 |
Branches:
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javiroman/ks7010
jz-2.6.34
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jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9