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Commit | Line | Data |
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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 | ||
9b6d5398 JP |
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
16 | ||
1afe593b | 17 | #include <crypto/skcipher.h> |
17926a79 DH |
18 | #include <linux/module.h> |
19 | #include <linux/net.h> | |
20 | #include <linux/skbuff.h> | |
76181c13 | 21 | #include <linux/key-type.h> |
33941284 | 22 | #include <linux/ctype.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
17926a79 DH |
24 | #include <net/sock.h> |
25 | #include <net/af_rxrpc.h> | |
26 | #include <keys/rxrpc-type.h> | |
27 | #include <keys/user-type.h> | |
28 | #include "ar-internal.h" | |
29 | ||
b9fffa38 | 30 | static int rxrpc_vet_description_s(const char *); |
8a7a3eb4 DH |
31 | static int rxrpc_preparse(struct key_preparsed_payload *); |
32 | static int rxrpc_preparse_s(struct key_preparsed_payload *); | |
33 | static void rxrpc_free_preparse(struct key_preparsed_payload *); | |
34 | static void rxrpc_free_preparse_s(struct key_preparsed_payload *); | |
17926a79 DH |
35 | static void rxrpc_destroy(struct key *); |
36 | static void rxrpc_destroy_s(struct key *); | |
37 | static void rxrpc_describe(const struct key *, struct seq_file *); | |
ed6dd18b | 38 | static long rxrpc_read(const struct key *, char __user *, size_t); |
17926a79 DH |
39 | |
40 | /* | |
41 | * rxrpc defined keys take an arbitrary string as the description and an | |
42 | * arbitrary blob of data as the payload | |
43 | */ | |
44 | struct key_type key_type_rxrpc = { | |
45 | .name = "rxrpc", | |
8a7a3eb4 DH |
46 | .preparse = rxrpc_preparse, |
47 | .free_preparse = rxrpc_free_preparse, | |
48 | .instantiate = generic_key_instantiate, | |
17926a79 DH |
49 | .destroy = rxrpc_destroy, |
50 | .describe = rxrpc_describe, | |
ed6dd18b | 51 | .read = rxrpc_read, |
17926a79 | 52 | }; |
17926a79 DH |
53 | EXPORT_SYMBOL(key_type_rxrpc); |
54 | ||
55 | /* | |
56 | * rxrpc server defined keys take "<serviceId>:<securityIndex>" as the | |
57 | * description and an 8-byte decryption key as the payload | |
58 | */ | |
59 | struct key_type key_type_rxrpc_s = { | |
60 | .name = "rxrpc_s", | |
b9fffa38 | 61 | .vet_description = rxrpc_vet_description_s, |
8a7a3eb4 DH |
62 | .preparse = rxrpc_preparse_s, |
63 | .free_preparse = rxrpc_free_preparse_s, | |
64 | .instantiate = generic_key_instantiate, | |
17926a79 DH |
65 | .destroy = rxrpc_destroy_s, |
66 | .describe = rxrpc_describe, | |
67 | }; | |
68 | ||
b9fffa38 DH |
69 | /* |
70 | * Vet the description for an RxRPC server key | |
71 | */ | |
72 | static int rxrpc_vet_description_s(const char *desc) | |
73 | { | |
74 | unsigned long num; | |
75 | char *p; | |
76 | ||
77 | num = simple_strtoul(desc, &p, 10); | |
78 | if (*p != ':' || num > 65535) | |
79 | return -EINVAL; | |
80 | num = simple_strtoul(p + 1, &p, 10); | |
81 | if (*p || num < 1 || num > 255) | |
82 | return -EINVAL; | |
83 | return 0; | |
84 | } | |
85 | ||
33941284 DH |
86 | /* |
87 | * parse an RxKAD type XDR format token | |
88 | * - the caller guarantees we have at least 4 words | |
89 | */ | |
8a7a3eb4 DH |
90 | static int rxrpc_preparse_xdr_rxkad(struct key_preparsed_payload *prep, |
91 | size_t datalen, | |
92 | const __be32 *xdr, unsigned int toklen) | |
33941284 | 93 | { |
99455153 | 94 | struct rxrpc_key_token *token, **pptoken; |
10674a03 | 95 | time64_t expiry; |
33941284 DH |
96 | size_t plen; |
97 | u32 tktlen; | |
33941284 DH |
98 | |
99 | _enter(",{%x,%x,%x,%x},%u", | |
100 | ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), | |
101 | toklen); | |
102 | ||
103 | if (toklen <= 8 * 4) | |
104 | return -EKEYREJECTED; | |
105 | tktlen = ntohl(xdr[7]); | |
106 | _debug("tktlen: %x", tktlen); | |
107 | if (tktlen > AFSTOKEN_RK_TIX_MAX) | |
108 | return -EKEYREJECTED; | |
fde0133b | 109 | if (toklen < 8 * 4 + tktlen) |
33941284 DH |
110 | return -EKEYREJECTED; |
111 | ||
112 | plen = sizeof(*token) + sizeof(*token->kad) + tktlen; | |
8a7a3eb4 | 113 | prep->quotalen = datalen + plen; |
33941284 DH |
114 | |
115 | plen -= sizeof(*token); | |
0a93ea2e | 116 | token = kzalloc(sizeof(*token), GFP_KERNEL); |
33941284 DH |
117 | if (!token) |
118 | return -ENOMEM; | |
119 | ||
0a93ea2e | 120 | token->kad = kzalloc(plen, GFP_KERNEL); |
33941284 DH |
121 | if (!token->kad) { |
122 | kfree(token); | |
123 | return -ENOMEM; | |
124 | } | |
125 | ||
126 | token->security_index = RXRPC_SECURITY_RXKAD; | |
127 | token->kad->ticket_len = tktlen; | |
128 | token->kad->vice_id = ntohl(xdr[0]); | |
129 | token->kad->kvno = ntohl(xdr[1]); | |
130 | token->kad->start = ntohl(xdr[4]); | |
131 | token->kad->expiry = ntohl(xdr[5]); | |
132 | token->kad->primary_flag = ntohl(xdr[6]); | |
133 | memcpy(&token->kad->session_key, &xdr[2], 8); | |
134 | memcpy(&token->kad->ticket, &xdr[8], tktlen); | |
135 | ||
136 | _debug("SCIX: %u", token->security_index); | |
137 | _debug("TLEN: %u", token->kad->ticket_len); | |
138 | _debug("EXPY: %x", token->kad->expiry); | |
139 | _debug("KVNO: %u", token->kad->kvno); | |
140 | _debug("PRIM: %u", token->kad->primary_flag); | |
141 | _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x", | |
142 | token->kad->session_key[0], token->kad->session_key[1], | |
143 | token->kad->session_key[2], token->kad->session_key[3], | |
144 | token->kad->session_key[4], token->kad->session_key[5], | |
145 | token->kad->session_key[6], token->kad->session_key[7]); | |
146 | if (token->kad->ticket_len >= 8) | |
147 | _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x", | |
148 | token->kad->ticket[0], token->kad->ticket[1], | |
149 | token->kad->ticket[2], token->kad->ticket[3], | |
150 | token->kad->ticket[4], token->kad->ticket[5], | |
151 | token->kad->ticket[6], token->kad->ticket[7]); | |
152 | ||
153 | /* count the number of tokens attached */ | |
146aa8b1 | 154 | prep->payload.data[1] = (void *)((unsigned long)prep->payload.data[1] + 1); |
33941284 DH |
155 | |
156 | /* attach the data */ | |
146aa8b1 | 157 | for (pptoken = (struct rxrpc_key_token **)&prep->payload.data[0]; |
99455153 DH |
158 | *pptoken; |
159 | pptoken = &(*pptoken)->next) | |
160 | continue; | |
161 | *pptoken = token; | |
10674a03 BW |
162 | expiry = rxrpc_u32_to_time64(token->kad->expiry); |
163 | if (expiry < prep->expiry) | |
164 | prep->expiry = expiry; | |
99455153 DH |
165 | |
166 | _leave(" = 0"); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static void rxrpc_free_krb5_principal(struct krb5_principal *princ) | |
171 | { | |
172 | int loop; | |
173 | ||
174 | if (princ->name_parts) { | |
175 | for (loop = princ->n_name_parts - 1; loop >= 0; loop--) | |
176 | kfree(princ->name_parts[loop]); | |
177 | kfree(princ->name_parts); | |
178 | } | |
179 | kfree(princ->realm); | |
180 | } | |
181 | ||
182 | static void rxrpc_free_krb5_tagged(struct krb5_tagged_data *td) | |
183 | { | |
184 | kfree(td->data); | |
185 | } | |
186 | ||
187 | /* | |
188 | * free up an RxK5 token | |
189 | */ | |
190 | static void rxrpc_rxk5_free(struct rxk5_key *rxk5) | |
191 | { | |
192 | int loop; | |
193 | ||
194 | rxrpc_free_krb5_principal(&rxk5->client); | |
195 | rxrpc_free_krb5_principal(&rxk5->server); | |
196 | rxrpc_free_krb5_tagged(&rxk5->session); | |
197 | ||
198 | if (rxk5->addresses) { | |
199 | for (loop = rxk5->n_addresses - 1; loop >= 0; loop--) | |
200 | rxrpc_free_krb5_tagged(&rxk5->addresses[loop]); | |
201 | kfree(rxk5->addresses); | |
202 | } | |
203 | if (rxk5->authdata) { | |
204 | for (loop = rxk5->n_authdata - 1; loop >= 0; loop--) | |
205 | rxrpc_free_krb5_tagged(&rxk5->authdata[loop]); | |
206 | kfree(rxk5->authdata); | |
207 | } | |
208 | ||
209 | kfree(rxk5->ticket); | |
210 | kfree(rxk5->ticket2); | |
211 | kfree(rxk5); | |
212 | } | |
213 | ||
214 | /* | |
215 | * extract a krb5 principal | |
216 | */ | |
217 | static int rxrpc_krb5_decode_principal(struct krb5_principal *princ, | |
218 | const __be32 **_xdr, | |
95c96174 | 219 | unsigned int *_toklen) |
99455153 DH |
220 | { |
221 | const __be32 *xdr = *_xdr; | |
5f2f9765 | 222 | unsigned int toklen = *_toklen, n_parts, loop, tmp, paddedlen; |
99455153 DH |
223 | |
224 | /* there must be at least one name, and at least #names+1 length | |
225 | * words */ | |
226 | if (toklen <= 12) | |
227 | return -EINVAL; | |
228 | ||
229 | _enter(",{%x,%x,%x},%u", | |
230 | ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), toklen); | |
231 | ||
232 | n_parts = ntohl(*xdr++); | |
233 | toklen -= 4; | |
234 | if (n_parts <= 0 || n_parts > AFSTOKEN_K5_COMPONENTS_MAX) | |
235 | return -EINVAL; | |
236 | princ->n_name_parts = n_parts; | |
237 | ||
238 | if (toklen <= (n_parts + 1) * 4) | |
239 | return -EINVAL; | |
240 | ||
f65bd5ec | 241 | princ->name_parts = kcalloc(n_parts, sizeof(char *), GFP_KERNEL); |
99455153 DH |
242 | if (!princ->name_parts) |
243 | return -ENOMEM; | |
244 | ||
245 | for (loop = 0; loop < n_parts; loop++) { | |
246 | if (toklen < 4) | |
247 | return -EINVAL; | |
248 | tmp = ntohl(*xdr++); | |
249 | toklen -= 4; | |
250 | if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX) | |
251 | return -EINVAL; | |
5f2f9765 DH |
252 | paddedlen = (tmp + 3) & ~3; |
253 | if (paddedlen > toklen) | |
99455153 DH |
254 | return -EINVAL; |
255 | princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL); | |
256 | if (!princ->name_parts[loop]) | |
257 | return -ENOMEM; | |
258 | memcpy(princ->name_parts[loop], xdr, tmp); | |
259 | princ->name_parts[loop][tmp] = 0; | |
5f2f9765 DH |
260 | toklen -= paddedlen; |
261 | xdr += paddedlen >> 2; | |
99455153 DH |
262 | } |
263 | ||
264 | if (toklen < 4) | |
265 | return -EINVAL; | |
266 | tmp = ntohl(*xdr++); | |
267 | toklen -= 4; | |
268 | if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX) | |
269 | return -EINVAL; | |
5f2f9765 DH |
270 | paddedlen = (tmp + 3) & ~3; |
271 | if (paddedlen > toklen) | |
99455153 DH |
272 | return -EINVAL; |
273 | princ->realm = kmalloc(tmp + 1, GFP_KERNEL); | |
274 | if (!princ->realm) | |
275 | return -ENOMEM; | |
276 | memcpy(princ->realm, xdr, tmp); | |
277 | princ->realm[tmp] = 0; | |
5f2f9765 DH |
278 | toklen -= paddedlen; |
279 | xdr += paddedlen >> 2; | |
99455153 DH |
280 | |
281 | _debug("%s/...@%s", princ->name_parts[0], princ->realm); | |
282 | ||
283 | *_xdr = xdr; | |
284 | *_toklen = toklen; | |
285 | _leave(" = 0 [toklen=%u]", toklen); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | /* | |
290 | * extract a piece of krb5 tagged data | |
291 | */ | |
292 | static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td, | |
293 | size_t max_data_size, | |
294 | const __be32 **_xdr, | |
95c96174 | 295 | unsigned int *_toklen) |
99455153 DH |
296 | { |
297 | const __be32 *xdr = *_xdr; | |
5f2f9765 | 298 | unsigned int toklen = *_toklen, len, paddedlen; |
99455153 DH |
299 | |
300 | /* there must be at least one tag and one length word */ | |
301 | if (toklen <= 8) | |
302 | return -EINVAL; | |
303 | ||
304 | _enter(",%zu,{%x,%x},%u", | |
305 | max_data_size, ntohl(xdr[0]), ntohl(xdr[1]), toklen); | |
306 | ||
307 | td->tag = ntohl(*xdr++); | |
308 | len = ntohl(*xdr++); | |
309 | toklen -= 8; | |
310 | if (len > max_data_size) | |
311 | return -EINVAL; | |
5f2f9765 DH |
312 | paddedlen = (len + 3) & ~3; |
313 | if (paddedlen > toklen) | |
314 | return -EINVAL; | |
99455153 DH |
315 | td->data_len = len; |
316 | ||
317 | if (len > 0) { | |
65d9d2ca | 318 | td->data = kmemdup(xdr, len, GFP_KERNEL); |
99455153 DH |
319 | if (!td->data) |
320 | return -ENOMEM; | |
5f2f9765 DH |
321 | toklen -= paddedlen; |
322 | xdr += paddedlen >> 2; | |
99455153 DH |
323 | } |
324 | ||
325 | _debug("tag %x len %x", td->tag, td->data_len); | |
326 | ||
327 | *_xdr = xdr; | |
328 | *_toklen = toklen; | |
329 | _leave(" = 0 [toklen=%u]", toklen); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | /* | |
334 | * extract an array of tagged data | |
335 | */ | |
336 | static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td, | |
337 | u8 *_n_elem, | |
338 | u8 max_n_elem, | |
339 | size_t max_elem_size, | |
340 | const __be32 **_xdr, | |
95c96174 | 341 | unsigned int *_toklen) |
99455153 DH |
342 | { |
343 | struct krb5_tagged_data *td; | |
344 | const __be32 *xdr = *_xdr; | |
95c96174 | 345 | unsigned int toklen = *_toklen, n_elem, loop; |
99455153 DH |
346 | int ret; |
347 | ||
348 | /* there must be at least one count */ | |
349 | if (toklen < 4) | |
350 | return -EINVAL; | |
351 | ||
352 | _enter(",,%u,%zu,{%x},%u", | |
353 | max_n_elem, max_elem_size, ntohl(xdr[0]), toklen); | |
354 | ||
355 | n_elem = ntohl(*xdr++); | |
356 | toklen -= 4; | |
fa4eff44 | 357 | if (n_elem > max_n_elem) |
99455153 DH |
358 | return -EINVAL; |
359 | *_n_elem = n_elem; | |
360 | if (n_elem > 0) { | |
361 | if (toklen <= (n_elem + 1) * 4) | |
362 | return -EINVAL; | |
363 | ||
364 | _debug("n_elem %d", n_elem); | |
365 | ||
f65bd5ec | 366 | td = kcalloc(n_elem, sizeof(struct krb5_tagged_data), |
99455153 DH |
367 | GFP_KERNEL); |
368 | if (!td) | |
369 | return -ENOMEM; | |
370 | *_td = td; | |
371 | ||
372 | for (loop = 0; loop < n_elem; loop++) { | |
373 | ret = rxrpc_krb5_decode_tagged_data(&td[loop], | |
374 | max_elem_size, | |
375 | &xdr, &toklen); | |
376 | if (ret < 0) | |
377 | return ret; | |
378 | } | |
379 | } | |
380 | ||
381 | *_xdr = xdr; | |
382 | *_toklen = toklen; | |
383 | _leave(" = 0 [toklen=%u]", toklen); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | /* | |
388 | * extract a krb5 ticket | |
389 | */ | |
4e36a95e | 390 | static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen, |
95c96174 | 391 | const __be32 **_xdr, unsigned int *_toklen) |
99455153 DH |
392 | { |
393 | const __be32 *xdr = *_xdr; | |
5f2f9765 | 394 | unsigned int toklen = *_toklen, len, paddedlen; |
99455153 DH |
395 | |
396 | /* there must be at least one length word */ | |
397 | if (toklen <= 4) | |
398 | return -EINVAL; | |
399 | ||
400 | _enter(",{%x},%u", ntohl(xdr[0]), toklen); | |
401 | ||
402 | len = ntohl(*xdr++); | |
403 | toklen -= 4; | |
404 | if (len > AFSTOKEN_K5_TIX_MAX) | |
405 | return -EINVAL; | |
5f2f9765 DH |
406 | paddedlen = (len + 3) & ~3; |
407 | if (paddedlen > toklen) | |
408 | return -EINVAL; | |
99455153 DH |
409 | *_tktlen = len; |
410 | ||
411 | _debug("ticket len %u", len); | |
412 | ||
413 | if (len > 0) { | |
65d9d2ca | 414 | *_ticket = kmemdup(xdr, len, GFP_KERNEL); |
99455153 DH |
415 | if (!*_ticket) |
416 | return -ENOMEM; | |
5f2f9765 DH |
417 | toklen -= paddedlen; |
418 | xdr += paddedlen >> 2; | |
99455153 DH |
419 | } |
420 | ||
421 | *_xdr = xdr; | |
422 | *_toklen = toklen; | |
423 | _leave(" = 0 [toklen=%u]", toklen); | |
424 | return 0; | |
425 | } | |
426 | ||
427 | /* | |
428 | * parse an RxK5 type XDR format token | |
429 | * - the caller guarantees we have at least 4 words | |
430 | */ | |
8a7a3eb4 DH |
431 | static int rxrpc_preparse_xdr_rxk5(struct key_preparsed_payload *prep, |
432 | size_t datalen, | |
433 | const __be32 *xdr, unsigned int toklen) | |
99455153 DH |
434 | { |
435 | struct rxrpc_key_token *token, **pptoken; | |
436 | struct rxk5_key *rxk5; | |
437 | const __be32 *end_xdr = xdr + (toklen >> 2); | |
10674a03 | 438 | time64_t expiry; |
99455153 DH |
439 | int ret; |
440 | ||
441 | _enter(",{%x,%x,%x,%x},%u", | |
442 | ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), | |
443 | toklen); | |
444 | ||
445 | /* reserve some payload space for this subkey - the length of the token | |
446 | * is a reasonable approximation */ | |
8a7a3eb4 | 447 | prep->quotalen = datalen + toklen; |
99455153 DH |
448 | |
449 | token = kzalloc(sizeof(*token), GFP_KERNEL); | |
450 | if (!token) | |
451 | return -ENOMEM; | |
452 | ||
453 | rxk5 = kzalloc(sizeof(*rxk5), GFP_KERNEL); | |
454 | if (!rxk5) { | |
455 | kfree(token); | |
456 | return -ENOMEM; | |
457 | } | |
458 | ||
459 | token->security_index = RXRPC_SECURITY_RXK5; | |
460 | token->k5 = rxk5; | |
461 | ||
462 | /* extract the principals */ | |
463 | ret = rxrpc_krb5_decode_principal(&rxk5->client, &xdr, &toklen); | |
464 | if (ret < 0) | |
465 | goto error; | |
466 | ret = rxrpc_krb5_decode_principal(&rxk5->server, &xdr, &toklen); | |
467 | if (ret < 0) | |
468 | goto error; | |
469 | ||
470 | /* extract the session key and the encoding type (the tag field -> | |
471 | * ENCTYPE_xxx) */ | |
472 | ret = rxrpc_krb5_decode_tagged_data(&rxk5->session, AFSTOKEN_DATA_MAX, | |
473 | &xdr, &toklen); | |
474 | if (ret < 0) | |
475 | goto error; | |
476 | ||
477 | if (toklen < 4 * 8 + 2 * 4) | |
478 | goto inval; | |
479 | rxk5->authtime = be64_to_cpup((const __be64 *) xdr); | |
480 | xdr += 2; | |
481 | rxk5->starttime = be64_to_cpup((const __be64 *) xdr); | |
482 | xdr += 2; | |
483 | rxk5->endtime = be64_to_cpup((const __be64 *) xdr); | |
484 | xdr += 2; | |
485 | rxk5->renew_till = be64_to_cpup((const __be64 *) xdr); | |
486 | xdr += 2; | |
487 | rxk5->is_skey = ntohl(*xdr++); | |
488 | rxk5->flags = ntohl(*xdr++); | |
489 | toklen -= 4 * 8 + 2 * 4; | |
490 | ||
491 | _debug("times: a=%llx s=%llx e=%llx rt=%llx", | |
492 | rxk5->authtime, rxk5->starttime, rxk5->endtime, | |
493 | rxk5->renew_till); | |
494 | _debug("is_skey=%x flags=%x", rxk5->is_skey, rxk5->flags); | |
495 | ||
496 | /* extract the permitted client addresses */ | |
497 | ret = rxrpc_krb5_decode_tagged_array(&rxk5->addresses, | |
498 | &rxk5->n_addresses, | |
499 | AFSTOKEN_K5_ADDRESSES_MAX, | |
500 | AFSTOKEN_DATA_MAX, | |
501 | &xdr, &toklen); | |
502 | if (ret < 0) | |
503 | goto error; | |
504 | ||
505 | ASSERTCMP((end_xdr - xdr) << 2, ==, toklen); | |
506 | ||
507 | /* extract the tickets */ | |
508 | ret = rxrpc_krb5_decode_ticket(&rxk5->ticket, &rxk5->ticket_len, | |
509 | &xdr, &toklen); | |
510 | if (ret < 0) | |
511 | goto error; | |
512 | ret = rxrpc_krb5_decode_ticket(&rxk5->ticket2, &rxk5->ticket2_len, | |
513 | &xdr, &toklen); | |
514 | if (ret < 0) | |
515 | goto error; | |
516 | ||
517 | ASSERTCMP((end_xdr - xdr) << 2, ==, toklen); | |
518 | ||
519 | /* extract the typed auth data */ | |
520 | ret = rxrpc_krb5_decode_tagged_array(&rxk5->authdata, | |
521 | &rxk5->n_authdata, | |
522 | AFSTOKEN_K5_AUTHDATA_MAX, | |
523 | AFSTOKEN_BDATALN_MAX, | |
524 | &xdr, &toklen); | |
525 | if (ret < 0) | |
526 | goto error; | |
527 | ||
528 | ASSERTCMP((end_xdr - xdr) << 2, ==, toklen); | |
529 | ||
530 | if (toklen != 0) | |
531 | goto inval; | |
532 | ||
8a7a3eb4 | 533 | /* attach the payload */ |
146aa8b1 | 534 | for (pptoken = (struct rxrpc_key_token **)&prep->payload.data[0]; |
99455153 DH |
535 | *pptoken; |
536 | pptoken = &(*pptoken)->next) | |
537 | continue; | |
538 | *pptoken = token; | |
0a378585 | 539 | expiry = rxrpc_u32_to_time64(token->k5->endtime); |
10674a03 BW |
540 | if (expiry < prep->expiry) |
541 | prep->expiry = expiry; | |
33941284 DH |
542 | |
543 | _leave(" = 0"); | |
544 | return 0; | |
99455153 DH |
545 | |
546 | inval: | |
547 | ret = -EINVAL; | |
548 | error: | |
549 | rxrpc_rxk5_free(rxk5); | |
550 | kfree(token); | |
551 | _leave(" = %d", ret); | |
552 | return ret; | |
33941284 DH |
553 | } |
554 | ||
555 | /* | |
556 | * attempt to parse the data as the XDR format | |
557 | * - the caller guarantees we have more than 7 words | |
558 | */ | |
8a7a3eb4 | 559 | static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) |
33941284 | 560 | { |
8a7a3eb4 | 561 | const __be32 *xdr = prep->data, *token; |
33941284 | 562 | const char *cp; |
5f2f9765 | 563 | unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix; |
8a7a3eb4 | 564 | size_t datalen = prep->datalen; |
33941284 DH |
565 | int ret; |
566 | ||
567 | _enter(",{%x,%x,%x,%x},%zu", | |
568 | ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), | |
8a7a3eb4 | 569 | prep->datalen); |
33941284 DH |
570 | |
571 | if (datalen > AFSTOKEN_LENGTH_MAX) | |
572 | goto not_xdr; | |
573 | ||
574 | /* XDR is an array of __be32's */ | |
575 | if (datalen & 3) | |
576 | goto not_xdr; | |
577 | ||
578 | /* the flags should be 0 (the setpag bit must be handled by | |
579 | * userspace) */ | |
580 | if (ntohl(*xdr++) != 0) | |
581 | goto not_xdr; | |
582 | datalen -= 4; | |
583 | ||
584 | /* check the cell name */ | |
585 | len = ntohl(*xdr++); | |
586 | if (len < 1 || len > AFSTOKEN_CELL_MAX) | |
587 | goto not_xdr; | |
588 | datalen -= 4; | |
5f2f9765 DH |
589 | paddedlen = (len + 3) & ~3; |
590 | if (paddedlen > datalen) | |
33941284 DH |
591 | goto not_xdr; |
592 | ||
593 | cp = (const char *) xdr; | |
594 | for (loop = 0; loop < len; loop++) | |
595 | if (!isprint(cp[loop])) | |
596 | goto not_xdr; | |
5f2f9765 DH |
597 | for (; loop < paddedlen; loop++) |
598 | if (cp[loop]) | |
599 | goto not_xdr; | |
33941284 | 600 | _debug("cellname: [%u/%u] '%*.*s'", |
5f2f9765 DH |
601 | len, paddedlen, len, len, (const char *) xdr); |
602 | datalen -= paddedlen; | |
603 | xdr += paddedlen >> 2; | |
33941284 DH |
604 | |
605 | /* get the token count */ | |
606 | if (datalen < 12) | |
607 | goto not_xdr; | |
608 | ntoken = ntohl(*xdr++); | |
609 | datalen -= 4; | |
610 | _debug("ntoken: %x", ntoken); | |
611 | if (ntoken < 1 || ntoken > AFSTOKEN_MAX) | |
612 | goto not_xdr; | |
613 | ||
614 | /* check each token wrapper */ | |
615 | token = xdr; | |
616 | loop = ntoken; | |
617 | do { | |
618 | if (datalen < 8) | |
619 | goto not_xdr; | |
620 | toklen = ntohl(*xdr++); | |
621 | sec_ix = ntohl(*xdr); | |
622 | datalen -= 4; | |
623 | _debug("token: [%x/%zx] %x", toklen, datalen, sec_ix); | |
5f2f9765 DH |
624 | paddedlen = (toklen + 3) & ~3; |
625 | if (toklen < 20 || toklen > datalen || paddedlen > datalen) | |
33941284 | 626 | goto not_xdr; |
5f2f9765 DH |
627 | datalen -= paddedlen; |
628 | xdr += paddedlen >> 2; | |
33941284 DH |
629 | |
630 | } while (--loop > 0); | |
631 | ||
632 | _debug("remainder: %zu", datalen); | |
633 | if (datalen != 0) | |
634 | goto not_xdr; | |
635 | ||
636 | /* okay: we're going to assume it's valid XDR format | |
637 | * - we ignore the cellname, relying on the key to be correctly named | |
638 | */ | |
639 | do { | |
640 | xdr = token; | |
641 | toklen = ntohl(*xdr++); | |
642 | token = xdr + ((toklen + 3) >> 2); | |
643 | sec_ix = ntohl(*xdr++); | |
644 | toklen -= 4; | |
645 | ||
99455153 DH |
646 | _debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token); |
647 | ||
33941284 DH |
648 | switch (sec_ix) { |
649 | case RXRPC_SECURITY_RXKAD: | |
8a7a3eb4 | 650 | ret = rxrpc_preparse_xdr_rxkad(prep, datalen, xdr, toklen); |
33941284 DH |
651 | if (ret != 0) |
652 | goto error; | |
653 | break; | |
654 | ||
99455153 | 655 | case RXRPC_SECURITY_RXK5: |
8a7a3eb4 | 656 | ret = rxrpc_preparse_xdr_rxk5(prep, datalen, xdr, toklen); |
99455153 DH |
657 | if (ret != 0) |
658 | goto error; | |
659 | break; | |
660 | ||
33941284 DH |
661 | default: |
662 | ret = -EPROTONOSUPPORT; | |
663 | goto error; | |
664 | } | |
665 | ||
666 | } while (--ntoken > 0); | |
667 | ||
668 | _leave(" = 0"); | |
669 | return 0; | |
670 | ||
671 | not_xdr: | |
672 | _leave(" = -EPROTO"); | |
673 | return -EPROTO; | |
674 | error: | |
675 | _leave(" = %d", ret); | |
676 | return ret; | |
677 | } | |
678 | ||
17926a79 | 679 | /* |
8a7a3eb4 DH |
680 | * Preparse an rxrpc defined key. |
681 | * | |
682 | * Data should be of the form: | |
17926a79 DH |
683 | * OFFSET LEN CONTENT |
684 | * 0 4 key interface version number | |
685 | * 4 2 security index (type) | |
686 | * 6 2 ticket length | |
687 | * 8 4 key expiry time (time_t) | |
688 | * 12 4 kvno | |
689 | * 16 8 session key | |
690 | * 24 [len] ticket | |
691 | * | |
692 | * if no data is provided, then a no-security key is made | |
693 | */ | |
8a7a3eb4 | 694 | static int rxrpc_preparse(struct key_preparsed_payload *prep) |
17926a79 | 695 | { |
33941284 DH |
696 | const struct rxrpc_key_data_v1 *v1; |
697 | struct rxrpc_key_token *token, **pp; | |
10674a03 | 698 | time64_t expiry; |
17926a79 DH |
699 | size_t plen; |
700 | u32 kver; | |
701 | int ret; | |
702 | ||
8a7a3eb4 | 703 | _enter("%zu", prep->datalen); |
17926a79 DH |
704 | |
705 | /* handle a no-security key */ | |
cf7f601c | 706 | if (!prep->data && prep->datalen == 0) |
17926a79 DH |
707 | return 0; |
708 | ||
33941284 | 709 | /* determine if the XDR payload format is being used */ |
cf7f601c | 710 | if (prep->datalen > 7 * 4) { |
8a7a3eb4 | 711 | ret = rxrpc_preparse_xdr(prep); |
33941284 DH |
712 | if (ret != -EPROTO) |
713 | return ret; | |
714 | } | |
715 | ||
17926a79 DH |
716 | /* get the key interface version number */ |
717 | ret = -EINVAL; | |
cf7f601c | 718 | if (prep->datalen <= 4 || !prep->data) |
17926a79 | 719 | goto error; |
cf7f601c DH |
720 | memcpy(&kver, prep->data, sizeof(kver)); |
721 | prep->data += sizeof(kver); | |
722 | prep->datalen -= sizeof(kver); | |
17926a79 DH |
723 | |
724 | _debug("KEY I/F VERSION: %u", kver); | |
725 | ||
726 | ret = -EKEYREJECTED; | |
727 | if (kver != 1) | |
728 | goto error; | |
729 | ||
730 | /* deal with a version 1 key */ | |
731 | ret = -EINVAL; | |
cf7f601c | 732 | if (prep->datalen < sizeof(*v1)) |
17926a79 DH |
733 | goto error; |
734 | ||
cf7f601c DH |
735 | v1 = prep->data; |
736 | if (prep->datalen != sizeof(*v1) + v1->ticket_length) | |
17926a79 DH |
737 | goto error; |
738 | ||
33941284 DH |
739 | _debug("SCIX: %u", v1->security_index); |
740 | _debug("TLEN: %u", v1->ticket_length); | |
741 | _debug("EXPY: %x", v1->expiry); | |
742 | _debug("KVNO: %u", v1->kvno); | |
17926a79 | 743 | _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x", |
33941284 DH |
744 | v1->session_key[0], v1->session_key[1], |
745 | v1->session_key[2], v1->session_key[3], | |
746 | v1->session_key[4], v1->session_key[5], | |
747 | v1->session_key[6], v1->session_key[7]); | |
748 | if (v1->ticket_length >= 8) | |
17926a79 | 749 | _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x", |
33941284 DH |
750 | v1->ticket[0], v1->ticket[1], |
751 | v1->ticket[2], v1->ticket[3], | |
752 | v1->ticket[4], v1->ticket[5], | |
753 | v1->ticket[6], v1->ticket[7]); | |
17926a79 DH |
754 | |
755 | ret = -EPROTONOSUPPORT; | |
33941284 | 756 | if (v1->security_index != RXRPC_SECURITY_RXKAD) |
17926a79 DH |
757 | goto error; |
758 | ||
33941284 | 759 | plen = sizeof(*token->kad) + v1->ticket_length; |
8a7a3eb4 | 760 | prep->quotalen = plen + sizeof(*token); |
17926a79 DH |
761 | |
762 | ret = -ENOMEM; | |
0a93ea2e | 763 | token = kzalloc(sizeof(*token), GFP_KERNEL); |
33941284 | 764 | if (!token) |
17926a79 | 765 | goto error; |
0a93ea2e | 766 | token->kad = kzalloc(plen, GFP_KERNEL); |
33941284 DH |
767 | if (!token->kad) |
768 | goto error_free; | |
769 | ||
770 | token->security_index = RXRPC_SECURITY_RXKAD; | |
771 | token->kad->ticket_len = v1->ticket_length; | |
772 | token->kad->expiry = v1->expiry; | |
773 | token->kad->kvno = v1->kvno; | |
774 | memcpy(&token->kad->session_key, &v1->session_key, 8); | |
775 | memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length); | |
17926a79 | 776 | |
8a7a3eb4 | 777 | /* count the number of tokens attached */ |
146aa8b1 | 778 | prep->payload.data[1] = (void *)((unsigned long)prep->payload.data[1] + 1); |
33941284 | 779 | |
8a7a3eb4 | 780 | /* attach the data */ |
146aa8b1 | 781 | pp = (struct rxrpc_key_token **)&prep->payload.data[0]; |
33941284 DH |
782 | while (*pp) |
783 | pp = &(*pp)->next; | |
784 | *pp = token; | |
10674a03 BW |
785 | expiry = rxrpc_u32_to_time64(token->kad->expiry); |
786 | if (expiry < prep->expiry) | |
787 | prep->expiry = expiry; | |
33941284 | 788 | token = NULL; |
17926a79 DH |
789 | ret = 0; |
790 | ||
33941284 DH |
791 | error_free: |
792 | kfree(token); | |
17926a79 DH |
793 | error: |
794 | return ret; | |
795 | } | |
796 | ||
797 | /* | |
8a7a3eb4 | 798 | * Free token list. |
17926a79 | 799 | */ |
8a7a3eb4 DH |
800 | static void rxrpc_free_token_list(struct rxrpc_key_token *token) |
801 | { | |
802 | struct rxrpc_key_token *next; | |
803 | ||
804 | for (; token; token = next) { | |
805 | next = token->next; | |
806 | switch (token->security_index) { | |
807 | case RXRPC_SECURITY_RXKAD: | |
808 | kfree(token->kad); | |
809 | break; | |
810 | case RXRPC_SECURITY_RXK5: | |
811 | if (token->k5) | |
812 | rxrpc_rxk5_free(token->k5); | |
813 | break; | |
814 | default: | |
9b6d5398 | 815 | pr_err("Unknown token type %x on rxrpc key\n", |
8a7a3eb4 DH |
816 | token->security_index); |
817 | BUG(); | |
818 | } | |
819 | ||
820 | kfree(token); | |
821 | } | |
822 | } | |
823 | ||
824 | /* | |
825 | * Clean up preparse data. | |
826 | */ | |
827 | static void rxrpc_free_preparse(struct key_preparsed_payload *prep) | |
828 | { | |
146aa8b1 | 829 | rxrpc_free_token_list(prep->payload.data[0]); |
8a7a3eb4 DH |
830 | } |
831 | ||
832 | /* | |
833 | * Preparse a server secret key. | |
834 | * | |
835 | * The data should be the 8-byte secret key. | |
836 | */ | |
837 | static int rxrpc_preparse_s(struct key_preparsed_payload *prep) | |
17926a79 | 838 | { |
1afe593b | 839 | struct crypto_skcipher *ci; |
17926a79 | 840 | |
8a7a3eb4 | 841 | _enter("%zu", prep->datalen); |
17926a79 | 842 | |
cf7f601c | 843 | if (prep->datalen != 8) |
17926a79 DH |
844 | return -EINVAL; |
845 | ||
146aa8b1 | 846 | memcpy(&prep->payload.data[2], prep->data, 8); |
17926a79 | 847 | |
1afe593b | 848 | ci = crypto_alloc_skcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC); |
17926a79 DH |
849 | if (IS_ERR(ci)) { |
850 | _leave(" = %ld", PTR_ERR(ci)); | |
851 | return PTR_ERR(ci); | |
852 | } | |
853 | ||
1afe593b | 854 | if (crypto_skcipher_setkey(ci, prep->data, 8) < 0) |
17926a79 DH |
855 | BUG(); |
856 | ||
146aa8b1 | 857 | prep->payload.data[0] = ci; |
17926a79 DH |
858 | _leave(" = 0"); |
859 | return 0; | |
860 | } | |
861 | ||
8a7a3eb4 DH |
862 | /* |
863 | * Clean up preparse data. | |
864 | */ | |
865 | static void rxrpc_free_preparse_s(struct key_preparsed_payload *prep) | |
866 | { | |
146aa8b1 | 867 | if (prep->payload.data[0]) |
1afe593b | 868 | crypto_free_skcipher(prep->payload.data[0]); |
8a7a3eb4 DH |
869 | } |
870 | ||
17926a79 DH |
871 | /* |
872 | * dispose of the data dangling from the corpse of a rxrpc key | |
873 | */ | |
874 | static void rxrpc_destroy(struct key *key) | |
875 | { | |
146aa8b1 | 876 | rxrpc_free_token_list(key->payload.data[0]); |
17926a79 DH |
877 | } |
878 | ||
879 | /* | |
880 | * dispose of the data dangling from the corpse of a rxrpc key | |
881 | */ | |
882 | static void rxrpc_destroy_s(struct key *key) | |
883 | { | |
146aa8b1 | 884 | if (key->payload.data[0]) { |
1afe593b | 885 | crypto_free_skcipher(key->payload.data[0]); |
146aa8b1 | 886 | key->payload.data[0] = NULL; |
17926a79 DH |
887 | } |
888 | } | |
889 | ||
890 | /* | |
891 | * describe the rxrpc key | |
892 | */ | |
893 | static void rxrpc_describe(const struct key *key, struct seq_file *m) | |
894 | { | |
895 | seq_puts(m, key->description); | |
896 | } | |
897 | ||
898 | /* | |
899 | * grab the security key for a socket | |
900 | */ | |
901 | int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen) | |
902 | { | |
903 | struct key *key; | |
904 | char *description; | |
905 | ||
906 | _enter(""); | |
907 | ||
908 | if (optlen <= 0 || optlen > PAGE_SIZE - 1) | |
909 | return -EINVAL; | |
910 | ||
16e5c1fc AV |
911 | description = memdup_user_nul(optval, optlen); |
912 | if (IS_ERR(description)) | |
913 | return PTR_ERR(description); | |
17926a79 DH |
914 | |
915 | key = request_key(&key_type_rxrpc, description, NULL); | |
916 | if (IS_ERR(key)) { | |
917 | kfree(description); | |
918 | _leave(" = %ld", PTR_ERR(key)); | |
919 | return PTR_ERR(key); | |
920 | } | |
921 | ||
922 | rx->key = key; | |
923 | kfree(description); | |
924 | _leave(" = 0 [key %x]", key->serial); | |
925 | return 0; | |
926 | } | |
927 | ||
928 | /* | |
929 | * grab the security keyring for a server socket | |
930 | */ | |
931 | int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval, | |
932 | int optlen) | |
933 | { | |
934 | struct key *key; | |
935 | char *description; | |
936 | ||
937 | _enter(""); | |
938 | ||
939 | if (optlen <= 0 || optlen > PAGE_SIZE - 1) | |
940 | return -EINVAL; | |
941 | ||
16e5c1fc AV |
942 | description = memdup_user_nul(optval, optlen); |
943 | if (IS_ERR(description)) | |
944 | return PTR_ERR(description); | |
17926a79 DH |
945 | |
946 | key = request_key(&key_type_keyring, description, NULL); | |
947 | if (IS_ERR(key)) { | |
948 | kfree(description); | |
949 | _leave(" = %ld", PTR_ERR(key)); | |
950 | return PTR_ERR(key); | |
951 | } | |
952 | ||
953 | rx->securities = key; | |
954 | kfree(description); | |
955 | _leave(" = 0 [key %x]", key->serial); | |
956 | return 0; | |
957 | } | |
958 | ||
959 | /* | |
960 | * generate a server data key | |
961 | */ | |
962 | int rxrpc_get_server_data_key(struct rxrpc_connection *conn, | |
963 | const void *session_key, | |
10674a03 | 964 | time64_t expiry, |
17926a79 DH |
965 | u32 kvno) |
966 | { | |
d84f4f99 | 967 | const struct cred *cred = current_cred(); |
17926a79 DH |
968 | struct key *key; |
969 | int ret; | |
970 | ||
971 | struct { | |
972 | u32 kver; | |
33941284 | 973 | struct rxrpc_key_data_v1 v1; |
17926a79 DH |
974 | } data; |
975 | ||
976 | _enter(""); | |
977 | ||
c6089735 EB |
978 | key = key_alloc(&key_type_rxrpc, "x", |
979 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, 0, | |
5ac7eace | 980 | KEY_ALLOC_NOT_IN_QUOTA, NULL); |
17926a79 DH |
981 | if (IS_ERR(key)) { |
982 | _leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key)); | |
983 | return -ENOMEM; | |
984 | } | |
985 | ||
986 | _debug("key %d", key_serial(key)); | |
987 | ||
988 | data.kver = 1; | |
33941284 DH |
989 | data.v1.security_index = RXRPC_SECURITY_RXKAD; |
990 | data.v1.ticket_length = 0; | |
10674a03 | 991 | data.v1.expiry = rxrpc_time64_to_u32(expiry); |
33941284 | 992 | data.v1.kvno = 0; |
17926a79 | 993 | |
33941284 | 994 | memcpy(&data.v1.session_key, session_key, sizeof(data.v1.session_key)); |
17926a79 DH |
995 | |
996 | ret = key_instantiate_and_link(key, &data, sizeof(data), NULL, NULL); | |
997 | if (ret < 0) | |
998 | goto error; | |
999 | ||
19ffa01c | 1000 | conn->params.key = key; |
17926a79 DH |
1001 | _leave(" = 0 [%d]", key_serial(key)); |
1002 | return 0; | |
1003 | ||
1004 | error: | |
1005 | key_revoke(key); | |
1006 | key_put(key); | |
1007 | _leave(" = -ENOMEM [ins %d]", ret); | |
1008 | return -ENOMEM; | |
1009 | } | |
17926a79 | 1010 | EXPORT_SYMBOL(rxrpc_get_server_data_key); |
76181c13 DH |
1011 | |
1012 | /** | |
1013 | * rxrpc_get_null_key - Generate a null RxRPC key | |
1014 | * @keyname: The name to give the key. | |
1015 | * | |
1016 | * Generate a null RxRPC key that can be used to indicate anonymous security is | |
1017 | * required for a particular domain. | |
1018 | */ | |
1019 | struct key *rxrpc_get_null_key(const char *keyname) | |
1020 | { | |
d84f4f99 | 1021 | const struct cred *cred = current_cred(); |
76181c13 DH |
1022 | struct key *key; |
1023 | int ret; | |
1024 | ||
c6089735 EB |
1025 | key = key_alloc(&key_type_rxrpc, keyname, |
1026 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, | |
5ac7eace | 1027 | KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA, NULL); |
76181c13 DH |
1028 | if (IS_ERR(key)) |
1029 | return key; | |
1030 | ||
1031 | ret = key_instantiate_and_link(key, NULL, 0, NULL, NULL); | |
1032 | if (ret < 0) { | |
1033 | key_revoke(key); | |
1034 | key_put(key); | |
1035 | return ERR_PTR(ret); | |
1036 | } | |
1037 | ||
1038 | return key; | |
1039 | } | |
1040 | EXPORT_SYMBOL(rxrpc_get_null_key); | |
ed6dd18b DH |
1041 | |
1042 | /* | |
1043 | * read the contents of an rxrpc key | |
1044 | * - this returns the result in XDR form | |
1045 | */ | |
1046 | static long rxrpc_read(const struct key *key, | |
1047 | char __user *buffer, size_t buflen) | |
1048 | { | |
99455153 DH |
1049 | const struct rxrpc_key_token *token; |
1050 | const struct krb5_principal *princ; | |
1051 | size_t size; | |
1052 | __be32 __user *xdr, *oldxdr; | |
1053 | u32 cnlen, toksize, ntoks, tok, zero; | |
1054 | u16 toksizes[AFSTOKEN_MAX]; | |
1055 | int loop; | |
ed6dd18b DH |
1056 | |
1057 | _enter(""); | |
1058 | ||
1059 | /* we don't know what form we should return non-AFS keys in */ | |
1060 | if (memcmp(key->description, "afs@", 4) != 0) | |
1061 | return -EOPNOTSUPP; | |
1062 | cnlen = strlen(key->description + 4); | |
1063 | ||
99455153 DH |
1064 | #define RND(X) (((X) + 3) & ~3) |
1065 | ||
ed6dd18b DH |
1066 | /* AFS keys we return in XDR form, so we need to work out the size of |
1067 | * the XDR */ | |
1068 | size = 2 * 4; /* flags, cellname len */ | |
99455153 | 1069 | size += RND(cnlen); /* cellname */ |
ed6dd18b DH |
1070 | size += 1 * 4; /* token count */ |
1071 | ||
1072 | ntoks = 0; | |
146aa8b1 | 1073 | for (token = key->payload.data[0]; token; token = token->next) { |
99455153 DH |
1074 | toksize = 4; /* sec index */ |
1075 | ||
ed6dd18b DH |
1076 | switch (token->security_index) { |
1077 | case RXRPC_SECURITY_RXKAD: | |
774521f3 | 1078 | toksize += 9 * 4; /* viceid, kvno, key*2 + len, begin, |
99455153 DH |
1079 | * end, primary, tktlen */ |
1080 | toksize += RND(token->kad->ticket_len); | |
ed6dd18b DH |
1081 | break; |
1082 | ||
99455153 DH |
1083 | case RXRPC_SECURITY_RXK5: |
1084 | princ = &token->k5->client; | |
1085 | toksize += 4 + princ->n_name_parts * 4; | |
1086 | for (loop = 0; loop < princ->n_name_parts; loop++) | |
1087 | toksize += RND(strlen(princ->name_parts[loop])); | |
1088 | toksize += 4 + RND(strlen(princ->realm)); | |
1089 | ||
1090 | princ = &token->k5->server; | |
1091 | toksize += 4 + princ->n_name_parts * 4; | |
1092 | for (loop = 0; loop < princ->n_name_parts; loop++) | |
1093 | toksize += RND(strlen(princ->name_parts[loop])); | |
1094 | toksize += 4 + RND(strlen(princ->realm)); | |
1095 | ||
1096 | toksize += 8 + RND(token->k5->session.data_len); | |
1097 | ||
1098 | toksize += 4 * 8 + 2 * 4; | |
1099 | ||
1100 | toksize += 4 + token->k5->n_addresses * 8; | |
1101 | for (loop = 0; loop < token->k5->n_addresses; loop++) | |
1102 | toksize += RND(token->k5->addresses[loop].data_len); | |
1103 | ||
1104 | toksize += 4 + RND(token->k5->ticket_len); | |
1105 | toksize += 4 + RND(token->k5->ticket2_len); | |
1106 | ||
1107 | toksize += 4 + token->k5->n_authdata * 8; | |
1108 | for (loop = 0; loop < token->k5->n_authdata; loop++) | |
1109 | toksize += RND(token->k5->authdata[loop].data_len); | |
ed6dd18b | 1110 | break; |
99455153 DH |
1111 | |
1112 | default: /* we have a ticket we can't encode */ | |
1113 | BUG(); | |
1114 | continue; | |
ed6dd18b | 1115 | } |
99455153 DH |
1116 | |
1117 | _debug("token[%u]: toksize=%u", ntoks, toksize); | |
1118 | ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX); | |
1119 | ||
1120 | toksizes[ntoks++] = toksize; | |
1121 | size += toksize + 4; /* each token has a length word */ | |
ed6dd18b DH |
1122 | } |
1123 | ||
99455153 DH |
1124 | #undef RND |
1125 | ||
ed6dd18b DH |
1126 | if (!buffer || buflen < size) |
1127 | return size; | |
1128 | ||
1129 | xdr = (__be32 __user *) buffer; | |
1130 | zero = 0; | |
1131 | #define ENCODE(x) \ | |
1132 | do { \ | |
1133 | __be32 y = htonl(x); \ | |
1134 | if (put_user(y, xdr++) < 0) \ | |
1135 | goto fault; \ | |
1136 | } while(0) | |
99455153 DH |
1137 | #define ENCODE_DATA(l, s) \ |
1138 | do { \ | |
1139 | u32 _l = (l); \ | |
1140 | ENCODE(l); \ | |
1141 | if (copy_to_user(xdr, (s), _l) != 0) \ | |
1142 | goto fault; \ | |
1143 | if (_l & 3 && \ | |
ed3bfdfd | 1144 | copy_to_user((u8 __user *)xdr + _l, &zero, 4 - (_l & 3)) != 0) \ |
99455153 DH |
1145 | goto fault; \ |
1146 | xdr += (_l + 3) >> 2; \ | |
1147 | } while(0) | |
1148 | #define ENCODE64(x) \ | |
1149 | do { \ | |
1150 | __be64 y = cpu_to_be64(x); \ | |
1151 | if (copy_to_user(xdr, &y, 8) != 0) \ | |
1152 | goto fault; \ | |
1153 | xdr += 8 >> 2; \ | |
1154 | } while(0) | |
1155 | #define ENCODE_STR(s) \ | |
1156 | do { \ | |
1157 | const char *_s = (s); \ | |
1158 | ENCODE_DATA(strlen(_s), _s); \ | |
1159 | } while(0) | |
ed6dd18b | 1160 | |
99455153 DH |
1161 | ENCODE(0); /* flags */ |
1162 | ENCODE_DATA(cnlen, key->description + 4); /* cellname */ | |
1163 | ENCODE(ntoks); | |
ed6dd18b | 1164 | |
99455153 | 1165 | tok = 0; |
146aa8b1 | 1166 | for (token = key->payload.data[0]; token; token = token->next) { |
99455153 DH |
1167 | toksize = toksizes[tok++]; |
1168 | ENCODE(toksize); | |
1169 | oldxdr = xdr; | |
1170 | ENCODE(token->security_index); | |
ed6dd18b DH |
1171 | |
1172 | switch (token->security_index) { | |
1173 | case RXRPC_SECURITY_RXKAD: | |
ed6dd18b DH |
1174 | ENCODE(token->kad->vice_id); |
1175 | ENCODE(token->kad->kvno); | |
99455153 | 1176 | ENCODE_DATA(8, token->kad->session_key); |
ed6dd18b DH |
1177 | ENCODE(token->kad->start); |
1178 | ENCODE(token->kad->expiry); | |
1179 | ENCODE(token->kad->primary_flag); | |
99455153 DH |
1180 | ENCODE_DATA(token->kad->ticket_len, token->kad->ticket); |
1181 | break; | |
1182 | ||
1183 | case RXRPC_SECURITY_RXK5: | |
1184 | princ = &token->k5->client; | |
1185 | ENCODE(princ->n_name_parts); | |
1186 | for (loop = 0; loop < princ->n_name_parts; loop++) | |
1187 | ENCODE_STR(princ->name_parts[loop]); | |
1188 | ENCODE_STR(princ->realm); | |
1189 | ||
1190 | princ = &token->k5->server; | |
1191 | ENCODE(princ->n_name_parts); | |
1192 | for (loop = 0; loop < princ->n_name_parts; loop++) | |
1193 | ENCODE_STR(princ->name_parts[loop]); | |
1194 | ENCODE_STR(princ->realm); | |
1195 | ||
1196 | ENCODE(token->k5->session.tag); | |
1197 | ENCODE_DATA(token->k5->session.data_len, | |
1198 | token->k5->session.data); | |
1199 | ||
1200 | ENCODE64(token->k5->authtime); | |
1201 | ENCODE64(token->k5->starttime); | |
1202 | ENCODE64(token->k5->endtime); | |
1203 | ENCODE64(token->k5->renew_till); | |
1204 | ENCODE(token->k5->is_skey); | |
1205 | ENCODE(token->k5->flags); | |
1206 | ||
1207 | ENCODE(token->k5->n_addresses); | |
1208 | for (loop = 0; loop < token->k5->n_addresses; loop++) { | |
1209 | ENCODE(token->k5->addresses[loop].tag); | |
1210 | ENCODE_DATA(token->k5->addresses[loop].data_len, | |
1211 | token->k5->addresses[loop].data); | |
1212 | } | |
1213 | ||
1214 | ENCODE_DATA(token->k5->ticket_len, token->k5->ticket); | |
1215 | ENCODE_DATA(token->k5->ticket2_len, token->k5->ticket2); | |
1216 | ||
1217 | ENCODE(token->k5->n_authdata); | |
1218 | for (loop = 0; loop < token->k5->n_authdata; loop++) { | |
1219 | ENCODE(token->k5->authdata[loop].tag); | |
1220 | ENCODE_DATA(token->k5->authdata[loop].data_len, | |
1221 | token->k5->authdata[loop].data); | |
1222 | } | |
ed6dd18b DH |
1223 | break; |
1224 | ||
1225 | default: | |
99455153 | 1226 | BUG(); |
ed6dd18b DH |
1227 | break; |
1228 | } | |
99455153 DH |
1229 | |
1230 | ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==, | |
1231 | toksize); | |
ed6dd18b DH |
1232 | } |
1233 | ||
99455153 DH |
1234 | #undef ENCODE_STR |
1235 | #undef ENCODE_DATA | |
1236 | #undef ENCODE64 | |
ed6dd18b DH |
1237 | #undef ENCODE |
1238 | ||
99455153 | 1239 | ASSERTCMP(tok, ==, ntoks); |
ed6dd18b DH |
1240 | ASSERTCMP((char __user *) xdr - buffer, ==, size); |
1241 | _leave(" = %zu", size); | |
1242 | return size; | |
1243 | ||
1244 | fault: | |
1245 | _leave(" = -EFAULT"); | |
1246 | return -EFAULT; | |
1247 | } |