1 /* RxRPC key management
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
11 * RxRPC keys should have a description of describing their purpose:
12 * "afs@CAMBRIDGE.REDHAT.COM>
15 #include <linux/module.h>
16 #include <linux/net.h>
17 #include <linux/skbuff.h>
18 #include <linux/key-type.h>
19 #include <linux/crypto.h>
20 #include <linux/ctype.h>
21 #include <linux/slab.h>
23 #include <net/af_rxrpc.h>
24 #include <keys/rxrpc-type.h>
25 #include <keys/user-type.h>
26 #include "ar-internal.h"
28 static int rxrpc_vet_description_s(const char *);
29 static int rxrpc_preparse(struct key_preparsed_payload *);
30 static int rxrpc_preparse_s(struct key_preparsed_payload *);
31 static void rxrpc_free_preparse(struct key_preparsed_payload *);
32 static void rxrpc_free_preparse_s(struct key_preparsed_payload *);
33 static void rxrpc_destroy(struct key *);
34 static void rxrpc_destroy_s(struct key *);
35 static void rxrpc_describe(const struct key *, struct seq_file *);
36 static long rxrpc_read(const struct key *, char __user *, size_t);
39 * rxrpc defined keys take an arbitrary string as the description and an
40 * arbitrary blob of data as the payload
42 struct key_type key_type_rxrpc = {
44 .preparse = rxrpc_preparse,
45 .free_preparse = rxrpc_free_preparse,
46 .instantiate = generic_key_instantiate,
47 .destroy = rxrpc_destroy,
48 .describe = rxrpc_describe,
51 EXPORT_SYMBOL(key_type_rxrpc);
54 * rxrpc server defined keys take "<serviceId>:<securityIndex>" as the
55 * description and an 8-byte decryption key as the payload
57 struct key_type key_type_rxrpc_s = {
59 .vet_description = rxrpc_vet_description_s,
60 .preparse = rxrpc_preparse_s,
61 .free_preparse = rxrpc_free_preparse_s,
62 .instantiate = generic_key_instantiate,
63 .destroy = rxrpc_destroy_s,
64 .describe = rxrpc_describe,
68 * Vet the description for an RxRPC server key
70 static int rxrpc_vet_description_s(const char *desc)
75 num = simple_strtoul(desc, &p, 10);
76 if (*p != ':' || num > 65535)
78 num = simple_strtoul(p + 1, &p, 10);
79 if (*p || num < 1 || num > 255)
85 * parse an RxKAD type XDR format token
86 * - the caller guarantees we have at least 4 words
88 static int rxrpc_preparse_xdr_rxkad(struct key_preparsed_payload *prep,
90 const __be32 *xdr, unsigned int toklen)
92 struct rxrpc_key_token *token, **pptoken;
96 _enter(",{%x,%x,%x,%x},%u",
97 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
101 return -EKEYREJECTED;
102 tktlen = ntohl(xdr[7]);
103 _debug("tktlen: %x", tktlen);
104 if (tktlen > AFSTOKEN_RK_TIX_MAX)
105 return -EKEYREJECTED;
106 if (toklen < 8 * 4 + tktlen)
107 return -EKEYREJECTED;
109 plen = sizeof(*token) + sizeof(*token->kad) + tktlen;
110 prep->quotalen = datalen + plen;
112 plen -= sizeof(*token);
113 token = kzalloc(sizeof(*token), GFP_KERNEL);
117 token->kad = kzalloc(plen, GFP_KERNEL);
123 token->security_index = RXRPC_SECURITY_RXKAD;
124 token->kad->ticket_len = tktlen;
125 token->kad->vice_id = ntohl(xdr[0]);
126 token->kad->kvno = ntohl(xdr[1]);
127 token->kad->start = ntohl(xdr[4]);
128 token->kad->expiry = ntohl(xdr[5]);
129 token->kad->primary_flag = ntohl(xdr[6]);
130 memcpy(&token->kad->session_key, &xdr[2], 8);
131 memcpy(&token->kad->ticket, &xdr[8], tktlen);
133 _debug("SCIX: %u", token->security_index);
134 _debug("TLEN: %u", token->kad->ticket_len);
135 _debug("EXPY: %x", token->kad->expiry);
136 _debug("KVNO: %u", token->kad->kvno);
137 _debug("PRIM: %u", token->kad->primary_flag);
138 _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
139 token->kad->session_key[0], token->kad->session_key[1],
140 token->kad->session_key[2], token->kad->session_key[3],
141 token->kad->session_key[4], token->kad->session_key[5],
142 token->kad->session_key[6], token->kad->session_key[7]);
143 if (token->kad->ticket_len >= 8)
144 _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
145 token->kad->ticket[0], token->kad->ticket[1],
146 token->kad->ticket[2], token->kad->ticket[3],
147 token->kad->ticket[4], token->kad->ticket[5],
148 token->kad->ticket[6], token->kad->ticket[7]);
150 /* count the number of tokens attached */
151 prep->payload.data[1] = (void *)((unsigned long)prep->payload.data[1] + 1);
153 /* attach the data */
154 for (pptoken = (struct rxrpc_key_token **)&prep->payload.data[0];
156 pptoken = &(*pptoken)->next)
159 if (token->kad->expiry < prep->expiry)
160 prep->expiry = token->kad->expiry;
166 static void rxrpc_free_krb5_principal(struct krb5_principal *princ)
170 if (princ->name_parts) {
171 for (loop = princ->n_name_parts - 1; loop >= 0; loop--)
172 kfree(princ->name_parts[loop]);
173 kfree(princ->name_parts);
178 static void rxrpc_free_krb5_tagged(struct krb5_tagged_data *td)
184 * free up an RxK5 token
186 static void rxrpc_rxk5_free(struct rxk5_key *rxk5)
190 rxrpc_free_krb5_principal(&rxk5->client);
191 rxrpc_free_krb5_principal(&rxk5->server);
192 rxrpc_free_krb5_tagged(&rxk5->session);
194 if (rxk5->addresses) {
195 for (loop = rxk5->n_addresses - 1; loop >= 0; loop--)
196 rxrpc_free_krb5_tagged(&rxk5->addresses[loop]);
197 kfree(rxk5->addresses);
199 if (rxk5->authdata) {
200 for (loop = rxk5->n_authdata - 1; loop >= 0; loop--)
201 rxrpc_free_krb5_tagged(&rxk5->authdata[loop]);
202 kfree(rxk5->authdata);
206 kfree(rxk5->ticket2);
211 * extract a krb5 principal
213 static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,
215 unsigned int *_toklen)
217 const __be32 *xdr = *_xdr;
218 unsigned int toklen = *_toklen, n_parts, loop, tmp, paddedlen;
220 /* there must be at least one name, and at least #names+1 length
225 _enter(",{%x,%x,%x},%u",
226 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), toklen);
228 n_parts = ntohl(*xdr++);
230 if (n_parts <= 0 || n_parts > AFSTOKEN_K5_COMPONENTS_MAX)
232 princ->n_name_parts = n_parts;
234 if (toklen <= (n_parts + 1) * 4)
237 princ->name_parts = kcalloc(n_parts, sizeof(char *), GFP_KERNEL);
238 if (!princ->name_parts)
241 for (loop = 0; loop < n_parts; loop++) {
246 if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX)
248 paddedlen = (tmp + 3) & ~3;
249 if (paddedlen > toklen)
251 princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL);
252 if (!princ->name_parts[loop])
254 memcpy(princ->name_parts[loop], xdr, tmp);
255 princ->name_parts[loop][tmp] = 0;
257 xdr += paddedlen >> 2;
264 if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX)
266 paddedlen = (tmp + 3) & ~3;
267 if (paddedlen > toklen)
269 princ->realm = kmalloc(tmp + 1, GFP_KERNEL);
272 memcpy(princ->realm, xdr, tmp);
273 princ->realm[tmp] = 0;
275 xdr += paddedlen >> 2;
277 _debug("%s/...@%s", princ->name_parts[0], princ->realm);
281 _leave(" = 0 [toklen=%u]", toklen);
286 * extract a piece of krb5 tagged data
288 static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,
289 size_t max_data_size,
291 unsigned int *_toklen)
293 const __be32 *xdr = *_xdr;
294 unsigned int toklen = *_toklen, len, paddedlen;
296 /* there must be at least one tag and one length word */
300 _enter(",%zu,{%x,%x},%u",
301 max_data_size, ntohl(xdr[0]), ntohl(xdr[1]), toklen);
303 td->tag = ntohl(*xdr++);
306 if (len > max_data_size)
308 paddedlen = (len + 3) & ~3;
309 if (paddedlen > toklen)
314 td->data = kmemdup(xdr, len, GFP_KERNEL);
318 xdr += paddedlen >> 2;
321 _debug("tag %x len %x", td->tag, td->data_len);
325 _leave(" = 0 [toklen=%u]", toklen);
330 * extract an array of tagged data
332 static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td,
335 size_t max_elem_size,
337 unsigned int *_toklen)
339 struct krb5_tagged_data *td;
340 const __be32 *xdr = *_xdr;
341 unsigned int toklen = *_toklen, n_elem, loop;
344 /* there must be at least one count */
348 _enter(",,%u,%zu,{%x},%u",
349 max_n_elem, max_elem_size, ntohl(xdr[0]), toklen);
351 n_elem = ntohl(*xdr++);
353 if (n_elem > max_n_elem)
357 if (toklen <= (n_elem + 1) * 4)
360 _debug("n_elem %d", n_elem);
362 td = kcalloc(n_elem, sizeof(struct krb5_tagged_data),
368 for (loop = 0; loop < n_elem; loop++) {
369 ret = rxrpc_krb5_decode_tagged_data(&td[loop],
379 _leave(" = 0 [toklen=%u]", toklen);
384 * extract a krb5 ticket
386 static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
387 const __be32 **_xdr, unsigned int *_toklen)
389 const __be32 *xdr = *_xdr;
390 unsigned int toklen = *_toklen, len, paddedlen;
392 /* there must be at least one length word */
396 _enter(",{%x},%u", ntohl(xdr[0]), toklen);
400 if (len > AFSTOKEN_K5_TIX_MAX)
402 paddedlen = (len + 3) & ~3;
403 if (paddedlen > toklen)
407 _debug("ticket len %u", len);
410 *_ticket = kmemdup(xdr, len, GFP_KERNEL);
414 xdr += paddedlen >> 2;
419 _leave(" = 0 [toklen=%u]", toklen);
424 * parse an RxK5 type XDR format token
425 * - the caller guarantees we have at least 4 words
427 static int rxrpc_preparse_xdr_rxk5(struct key_preparsed_payload *prep,
429 const __be32 *xdr, unsigned int toklen)
431 struct rxrpc_key_token *token, **pptoken;
432 struct rxk5_key *rxk5;
433 const __be32 *end_xdr = xdr + (toklen >> 2);
436 _enter(",{%x,%x,%x,%x},%u",
437 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
440 /* reserve some payload space for this subkey - the length of the token
441 * is a reasonable approximation */
442 prep->quotalen = datalen + toklen;
444 token = kzalloc(sizeof(*token), GFP_KERNEL);
448 rxk5 = kzalloc(sizeof(*rxk5), GFP_KERNEL);
454 token->security_index = RXRPC_SECURITY_RXK5;
457 /* extract the principals */
458 ret = rxrpc_krb5_decode_principal(&rxk5->client, &xdr, &toklen);
461 ret = rxrpc_krb5_decode_principal(&rxk5->server, &xdr, &toklen);
465 /* extract the session key and the encoding type (the tag field ->
467 ret = rxrpc_krb5_decode_tagged_data(&rxk5->session, AFSTOKEN_DATA_MAX,
472 if (toklen < 4 * 8 + 2 * 4)
474 rxk5->authtime = be64_to_cpup((const __be64 *) xdr);
476 rxk5->starttime = be64_to_cpup((const __be64 *) xdr);
478 rxk5->endtime = be64_to_cpup((const __be64 *) xdr);
480 rxk5->renew_till = be64_to_cpup((const __be64 *) xdr);
482 rxk5->is_skey = ntohl(*xdr++);
483 rxk5->flags = ntohl(*xdr++);
484 toklen -= 4 * 8 + 2 * 4;
486 _debug("times: a=%llx s=%llx e=%llx rt=%llx",
487 rxk5->authtime, rxk5->starttime, rxk5->endtime,
489 _debug("is_skey=%x flags=%x", rxk5->is_skey, rxk5->flags);
491 /* extract the permitted client addresses */
492 ret = rxrpc_krb5_decode_tagged_array(&rxk5->addresses,
494 AFSTOKEN_K5_ADDRESSES_MAX,
500 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
502 /* extract the tickets */
503 ret = rxrpc_krb5_decode_ticket(&rxk5->ticket, &rxk5->ticket_len,
507 ret = rxrpc_krb5_decode_ticket(&rxk5->ticket2, &rxk5->ticket2_len,
512 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
514 /* extract the typed auth data */
515 ret = rxrpc_krb5_decode_tagged_array(&rxk5->authdata,
517 AFSTOKEN_K5_AUTHDATA_MAX,
518 AFSTOKEN_BDATALN_MAX,
523 ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
528 /* attach the payload */
529 for (pptoken = (struct rxrpc_key_token **)&prep->payload.data[0];
531 pptoken = &(*pptoken)->next)
534 if (token->kad->expiry < prep->expiry)
535 prep->expiry = token->kad->expiry;
543 rxrpc_rxk5_free(rxk5);
545 _leave(" = %d", ret);
550 * attempt to parse the data as the XDR format
551 * - the caller guarantees we have more than 7 words
553 static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
555 const __be32 *xdr = prep->data, *token;
557 unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix;
558 size_t datalen = prep->datalen;
561 _enter(",{%x,%x,%x,%x},%zu",
562 ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
565 if (datalen > AFSTOKEN_LENGTH_MAX)
568 /* XDR is an array of __be32's */
572 /* the flags should be 0 (the setpag bit must be handled by
574 if (ntohl(*xdr++) != 0)
578 /* check the cell name */
580 if (len < 1 || len > AFSTOKEN_CELL_MAX)
583 paddedlen = (len + 3) & ~3;
584 if (paddedlen > datalen)
587 cp = (const char *) xdr;
588 for (loop = 0; loop < len; loop++)
589 if (!isprint(cp[loop]))
591 for (; loop < paddedlen; loop++)
594 _debug("cellname: [%u/%u] '%*.*s'",
595 len, paddedlen, len, len, (const char *) xdr);
596 datalen -= paddedlen;
597 xdr += paddedlen >> 2;
599 /* get the token count */
602 ntoken = ntohl(*xdr++);
604 _debug("ntoken: %x", ntoken);
605 if (ntoken < 1 || ntoken > AFSTOKEN_MAX)
608 /* check each token wrapper */
614 toklen = ntohl(*xdr++);
615 sec_ix = ntohl(*xdr);
617 _debug("token: [%x/%zx] %x", toklen, datalen, sec_ix);
618 paddedlen = (toklen + 3) & ~3;
619 if (toklen < 20 || toklen > datalen || paddedlen > datalen)
621 datalen -= paddedlen;
622 xdr += paddedlen >> 2;
624 } while (--loop > 0);
626 _debug("remainder: %zu", datalen);
630 /* okay: we're going to assume it's valid XDR format
631 * - we ignore the cellname, relying on the key to be correctly named
635 toklen = ntohl(*xdr++);
636 token = xdr + ((toklen + 3) >> 2);
637 sec_ix = ntohl(*xdr++);
640 _debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token);
643 case RXRPC_SECURITY_RXKAD:
644 ret = rxrpc_preparse_xdr_rxkad(prep, datalen, xdr, toklen);
649 case RXRPC_SECURITY_RXK5:
650 ret = rxrpc_preparse_xdr_rxk5(prep, datalen, xdr, toklen);
656 ret = -EPROTONOSUPPORT;
660 } while (--ntoken > 0);
666 _leave(" = -EPROTO");
669 _leave(" = %d", ret);
674 * Preparse an rxrpc defined key.
676 * Data should be of the form:
678 * 0 4 key interface version number
679 * 4 2 security index (type)
681 * 8 4 key expiry time (time_t)
686 * if no data is provided, then a no-security key is made
688 static int rxrpc_preparse(struct key_preparsed_payload *prep)
690 const struct rxrpc_key_data_v1 *v1;
691 struct rxrpc_key_token *token, **pp;
696 _enter("%zu", prep->datalen);
698 /* handle a no-security key */
699 if (!prep->data && prep->datalen == 0)
702 /* determine if the XDR payload format is being used */
703 if (prep->datalen > 7 * 4) {
704 ret = rxrpc_preparse_xdr(prep);
709 /* get the key interface version number */
711 if (prep->datalen <= 4 || !prep->data)
713 memcpy(&kver, prep->data, sizeof(kver));
714 prep->data += sizeof(kver);
715 prep->datalen -= sizeof(kver);
717 _debug("KEY I/F VERSION: %u", kver);
723 /* deal with a version 1 key */
725 if (prep->datalen < sizeof(*v1))
729 if (prep->datalen != sizeof(*v1) + v1->ticket_length)
732 _debug("SCIX: %u", v1->security_index);
733 _debug("TLEN: %u", v1->ticket_length);
734 _debug("EXPY: %x", v1->expiry);
735 _debug("KVNO: %u", v1->kvno);
736 _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
737 v1->session_key[0], v1->session_key[1],
738 v1->session_key[2], v1->session_key[3],
739 v1->session_key[4], v1->session_key[5],
740 v1->session_key[6], v1->session_key[7]);
741 if (v1->ticket_length >= 8)
742 _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
743 v1->ticket[0], v1->ticket[1],
744 v1->ticket[2], v1->ticket[3],
745 v1->ticket[4], v1->ticket[5],
746 v1->ticket[6], v1->ticket[7]);
748 ret = -EPROTONOSUPPORT;
749 if (v1->security_index != RXRPC_SECURITY_RXKAD)
752 plen = sizeof(*token->kad) + v1->ticket_length;
753 prep->quotalen = plen + sizeof(*token);
756 token = kzalloc(sizeof(*token), GFP_KERNEL);
759 token->kad = kzalloc(plen, GFP_KERNEL);
763 token->security_index = RXRPC_SECURITY_RXKAD;
764 token->kad->ticket_len = v1->ticket_length;
765 token->kad->expiry = v1->expiry;
766 token->kad->kvno = v1->kvno;
767 memcpy(&token->kad->session_key, &v1->session_key, 8);
768 memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length);
770 /* count the number of tokens attached */
771 prep->payload.data[1] = (void *)((unsigned long)prep->payload.data[1] + 1);
773 /* attach the data */
774 pp = (struct rxrpc_key_token **)&prep->payload.data[0];
778 if (token->kad->expiry < prep->expiry)
779 prep->expiry = token->kad->expiry;
792 static void rxrpc_free_token_list(struct rxrpc_key_token *token)
794 struct rxrpc_key_token *next;
796 for (; token; token = next) {
798 switch (token->security_index) {
799 case RXRPC_SECURITY_RXKAD:
802 case RXRPC_SECURITY_RXK5:
804 rxrpc_rxk5_free(token->k5);
807 printk(KERN_ERR "Unknown token type %x on rxrpc key\n",
808 token->security_index);
817 * Clean up preparse data.
819 static void rxrpc_free_preparse(struct key_preparsed_payload *prep)
821 rxrpc_free_token_list(prep->payload.data[0]);
825 * Preparse a server secret key.
827 * The data should be the 8-byte secret key.
829 static int rxrpc_preparse_s(struct key_preparsed_payload *prep)
831 struct crypto_blkcipher *ci;
833 _enter("%zu", prep->datalen);
835 if (prep->datalen != 8)
838 memcpy(&prep->payload.data[2], prep->data, 8);
840 ci = crypto_alloc_blkcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC);
842 _leave(" = %ld", PTR_ERR(ci));
846 if (crypto_blkcipher_setkey(ci, prep->data, 8) < 0)
849 prep->payload.data[0] = ci;
855 * Clean up preparse data.
857 static void rxrpc_free_preparse_s(struct key_preparsed_payload *prep)
859 if (prep->payload.data[0])
860 crypto_free_blkcipher(prep->payload.data[0]);
864 * dispose of the data dangling from the corpse of a rxrpc key
866 static void rxrpc_destroy(struct key *key)
868 rxrpc_free_token_list(key->payload.data[0]);
872 * dispose of the data dangling from the corpse of a rxrpc key
874 static void rxrpc_destroy_s(struct key *key)
876 if (key->payload.data[0]) {
877 crypto_free_blkcipher(key->payload.data[0]);
878 key->payload.data[0] = NULL;
883 * describe the rxrpc key
885 static void rxrpc_describe(const struct key *key, struct seq_file *m)
887 seq_puts(m, key->description);
891 * grab the security key for a socket
893 int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
900 if (optlen <= 0 || optlen > PAGE_SIZE - 1 || rx->securities)
903 description = kmalloc(optlen + 1, GFP_KERNEL);
907 if (copy_from_user(description, optval, optlen)) {
911 description[optlen] = 0;
913 key = request_key(&key_type_rxrpc, description, NULL);
916 _leave(" = %ld", PTR_ERR(key));
922 _leave(" = 0 [key %x]", key->serial);
927 * grab the security keyring for a server socket
929 int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval,
937 if (optlen <= 0 || optlen > PAGE_SIZE - 1)
940 description = kmalloc(optlen + 1, GFP_KERNEL);
944 if (copy_from_user(description, optval, optlen)) {
948 description[optlen] = 0;
950 key = request_key(&key_type_keyring, description, NULL);
953 _leave(" = %ld", PTR_ERR(key));
957 rx->securities = key;
959 _leave(" = 0 [key %x]", key->serial);
964 * generate a server data key
966 int rxrpc_get_server_data_key(struct rxrpc_connection *conn,
967 const void *session_key,
971 const struct cred *cred = current_cred();
977 struct rxrpc_key_data_v1 v1;
982 key = key_alloc(&key_type_rxrpc, "x",
983 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, 0,
984 KEY_ALLOC_NOT_IN_QUOTA);
986 _leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key));
990 _debug("key %d", key_serial(key));
993 data.v1.security_index = RXRPC_SECURITY_RXKAD;
994 data.v1.ticket_length = 0;
995 data.v1.expiry = expiry;
998 memcpy(&data.v1.session_key, session_key, sizeof(data.v1.session_key));
1000 ret = key_instantiate_and_link(key, &data, sizeof(data), NULL, NULL);
1005 _leave(" = 0 [%d]", key_serial(key));
1011 _leave(" = -ENOMEM [ins %d]", ret);
1014 EXPORT_SYMBOL(rxrpc_get_server_data_key);
1017 * rxrpc_get_null_key - Generate a null RxRPC key
1018 * @keyname: The name to give the key.
1020 * Generate a null RxRPC key that can be used to indicate anonymous security is
1021 * required for a particular domain.
1023 struct key *rxrpc_get_null_key(const char *keyname)
1025 const struct cred *cred = current_cred();
1029 key = key_alloc(&key_type_rxrpc, keyname,
1030 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
1031 KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA);
1035 ret = key_instantiate_and_link(key, NULL, 0, NULL, NULL);
1039 return ERR_PTR(ret);
1044 EXPORT_SYMBOL(rxrpc_get_null_key);
1047 * read the contents of an rxrpc key
1048 * - this returns the result in XDR form
1050 static long rxrpc_read(const struct key *key,
1051 char __user *buffer, size_t buflen)
1053 const struct rxrpc_key_token *token;
1054 const struct krb5_principal *princ;
1056 __be32 __user *xdr, *oldxdr;
1057 u32 cnlen, toksize, ntoks, tok, zero;
1058 u16 toksizes[AFSTOKEN_MAX];
1063 /* we don't know what form we should return non-AFS keys in */
1064 if (memcmp(key->description, "afs@", 4) != 0)
1066 cnlen = strlen(key->description + 4);
1068 #define RND(X) (((X) + 3) & ~3)
1070 /* AFS keys we return in XDR form, so we need to work out the size of
1072 size = 2 * 4; /* flags, cellname len */
1073 size += RND(cnlen); /* cellname */
1074 size += 1 * 4; /* token count */
1077 for (token = key->payload.data[0]; token; token = token->next) {
1078 toksize = 4; /* sec index */
1080 switch (token->security_index) {
1081 case RXRPC_SECURITY_RXKAD:
1082 toksize += 8 * 4; /* viceid, kvno, key*2, begin,
1083 * end, primary, tktlen */
1084 toksize += RND(token->kad->ticket_len);
1087 case RXRPC_SECURITY_RXK5:
1088 princ = &token->k5->client;
1089 toksize += 4 + princ->n_name_parts * 4;
1090 for (loop = 0; loop < princ->n_name_parts; loop++)
1091 toksize += RND(strlen(princ->name_parts[loop]));
1092 toksize += 4 + RND(strlen(princ->realm));
1094 princ = &token->k5->server;
1095 toksize += 4 + princ->n_name_parts * 4;
1096 for (loop = 0; loop < princ->n_name_parts; loop++)
1097 toksize += RND(strlen(princ->name_parts[loop]));
1098 toksize += 4 + RND(strlen(princ->realm));
1100 toksize += 8 + RND(token->k5->session.data_len);
1102 toksize += 4 * 8 + 2 * 4;
1104 toksize += 4 + token->k5->n_addresses * 8;
1105 for (loop = 0; loop < token->k5->n_addresses; loop++)
1106 toksize += RND(token->k5->addresses[loop].data_len);
1108 toksize += 4 + RND(token->k5->ticket_len);
1109 toksize += 4 + RND(token->k5->ticket2_len);
1111 toksize += 4 + token->k5->n_authdata * 8;
1112 for (loop = 0; loop < token->k5->n_authdata; loop++)
1113 toksize += RND(token->k5->authdata[loop].data_len);
1116 default: /* we have a ticket we can't encode */
1117 pr_err("Unsupported key token type (%u)\n",
1118 token->security_index);
1122 _debug("token[%u]: toksize=%u", ntoks, toksize);
1123 ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX);
1125 toksizes[ntoks++] = toksize;
1126 size += toksize + 4; /* each token has a length word */
1131 if (!buffer || buflen < size)
1134 xdr = (__be32 __user *) buffer;
1138 __be32 y = htonl(x); \
1139 if (put_user(y, xdr++) < 0) \
1142 #define ENCODE_DATA(l, s) \
1146 if (copy_to_user(xdr, (s), _l) != 0) \
1149 copy_to_user((u8 __user *)xdr + _l, &zero, 4 - (_l & 3)) != 0) \
1151 xdr += (_l + 3) >> 2; \
1153 #define ENCODE_BYTES(l, s) \
1156 memcpy(xdr, (s), _l); \
1158 memcpy((u8 *)xdr + _l, &zero, 4 - (_l & 3)); \
1159 xdr += (_l + 3) >> 2; \
1161 #define ENCODE64(x) \
1163 __be64 y = cpu_to_be64(x); \
1164 if (copy_to_user(xdr, &y, 8) != 0) \
1168 #define ENCODE_STR(s) \
1170 const char *_s = (s); \
1171 ENCODE_DATA(strlen(_s), _s); \
1174 ENCODE(0); /* flags */
1175 ENCODE_DATA(cnlen, key->description + 4); /* cellname */
1179 for (token = key->payload.data[0]; token; token = token->next) {
1180 toksize = toksizes[tok++];
1183 ENCODE(token->security_index);
1185 switch (token->security_index) {
1186 case RXRPC_SECURITY_RXKAD:
1187 ENCODE(token->kad->vice_id);
1188 ENCODE(token->kad->kvno);
1189 ENCODE_BYTES(8, token->kad->session_key);
1190 ENCODE(token->kad->start);
1191 ENCODE(token->kad->expiry);
1192 ENCODE(token->kad->primary_flag);
1193 ENCODE_DATA(token->kad->ticket_len, token->kad->ticket);
1196 case RXRPC_SECURITY_RXK5:
1197 princ = &token->k5->client;
1198 ENCODE(princ->n_name_parts);
1199 for (loop = 0; loop < princ->n_name_parts; loop++)
1200 ENCODE_STR(princ->name_parts[loop]);
1201 ENCODE_STR(princ->realm);
1203 princ = &token->k5->server;
1204 ENCODE(princ->n_name_parts);
1205 for (loop = 0; loop < princ->n_name_parts; loop++)
1206 ENCODE_STR(princ->name_parts[loop]);
1207 ENCODE_STR(princ->realm);
1209 ENCODE(token->k5->session.tag);
1210 ENCODE_DATA(token->k5->session.data_len,
1211 token->k5->session.data);
1213 ENCODE64(token->k5->authtime);
1214 ENCODE64(token->k5->starttime);
1215 ENCODE64(token->k5->endtime);
1216 ENCODE64(token->k5->renew_till);
1217 ENCODE(token->k5->is_skey);
1218 ENCODE(token->k5->flags);
1220 ENCODE(token->k5->n_addresses);
1221 for (loop = 0; loop < token->k5->n_addresses; loop++) {
1222 ENCODE(token->k5->addresses[loop].tag);
1223 ENCODE_DATA(token->k5->addresses[loop].data_len,
1224 token->k5->addresses[loop].data);
1227 ENCODE_DATA(token->k5->ticket_len, token->k5->ticket);
1228 ENCODE_DATA(token->k5->ticket2_len, token->k5->ticket2);
1230 ENCODE(token->k5->n_authdata);
1231 for (loop = 0; loop < token->k5->n_authdata; loop++) {
1232 ENCODE(token->k5->authdata[loop].tag);
1233 ENCODE_DATA(token->k5->authdata[loop].data_len,
1234 token->k5->authdata[loop].data);
1239 pr_err("Unsupported key token type (%u)\n",
1240 token->security_index);
1244 ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==,
1253 ASSERTCMP(tok, ==, ntoks);
1254 ASSERTCMP((char __user *) xdr - buffer, ==, size);
1255 _leave(" = %zu", size);
1259 _leave(" = -EFAULT");