1
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/err.h>
5#include <linux/module.h>
6#include <linux/random.h>
7#include <linux/slab.h>
8
9#include <linux/ceph/decode.h>
10#include <linux/ceph/auth.h>
11#include <linux/ceph/libceph.h>
12#include <linux/ceph/messenger.h>
13
14#include "crypto.h"
15#include "auth_x.h"
16#include "auth_x_protocol.h"
17
18static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
19
20static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
21{
22 struct ceph_x_info *xi = ac->private;
23 int need;
24
25 ceph_x_validate_tickets(ac, &need);
26 dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
27 ac->want_keys, need, xi->have_keys);
28 return (ac->want_keys & xi->have_keys) == ac->want_keys;
29}
30
31static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
32{
33 struct ceph_x_info *xi = ac->private;
34 int need;
35
36 ceph_x_validate_tickets(ac, &need);
37 dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
38 ac->want_keys, need, xi->have_keys);
39 return need != 0;
40}
41
42static int ceph_x_encrypt_offset(void)
43{
44 return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
45}
46
47static int ceph_x_encrypt_buflen(int ilen)
48{
49 return ceph_x_encrypt_offset() + ilen + 16;
50}
51
52static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
53 int buf_len, int plaintext_len)
54{
55 struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
56 int ciphertext_len;
57 int ret;
58
59 hdr->struct_v = 1;
60 hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
61
62 ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
63 plaintext_len + sizeof(struct ceph_x_encrypt_header),
64 &ciphertext_len);
65 if (ret)
66 return ret;
67
68 ceph_encode_32(&buf, ciphertext_len);
69 return sizeof(u32) + ciphertext_len;
70}
71
72static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
73{
74 struct ceph_x_encrypt_header *hdr = *p + sizeof(u32);
75 int ciphertext_len, plaintext_len;
76 int ret;
77
78 ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
79 ceph_decode_need(p, end, ciphertext_len, e_inval);
80
81 ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len,
82 &plaintext_len);
83 if (ret)
84 return ret;
85
86 if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC)
87 return -EPERM;
88
89 *p += ciphertext_len;
90 return plaintext_len - sizeof(struct ceph_x_encrypt_header);
91
92e_inval:
93 return -EINVAL;
94}
95
96
97
98
99static struct ceph_x_ticket_handler *
100get_ticket_handler(struct ceph_auth_client *ac, int service)
101{
102 struct ceph_x_ticket_handler *th;
103 struct ceph_x_info *xi = ac->private;
104 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
105
106 while (*p) {
107 parent = *p;
108 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
109 if (service < th->service)
110 p = &(*p)->rb_left;
111 else if (service > th->service)
112 p = &(*p)->rb_right;
113 else
114 return th;
115 }
116
117
118 th = kzalloc(sizeof(*th), GFP_NOFS);
119 if (!th)
120 return ERR_PTR(-ENOMEM);
121 th->service = service;
122 rb_link_node(&th->node, parent, p);
123 rb_insert_color(&th->node, &xi->ticket_handlers);
124 return th;
125}
126
127static void remove_ticket_handler(struct ceph_auth_client *ac,
128 struct ceph_x_ticket_handler *th)
129{
130 struct ceph_x_info *xi = ac->private;
131
132 dout("remove_ticket_handler %p %d\n", th, th->service);
133 rb_erase(&th->node, &xi->ticket_handlers);
134 ceph_crypto_key_destroy(&th->session_key);
135 if (th->ticket_blob)
136 ceph_buffer_put(th->ticket_blob);
137 kfree(th);
138}
139
140static int process_one_ticket(struct ceph_auth_client *ac,
141 struct ceph_crypto_key *secret,
142 void **p, void *end)
143{
144 struct ceph_x_info *xi = ac->private;
145 int type;
146 u8 tkt_struct_v, blob_struct_v;
147 struct ceph_x_ticket_handler *th;
148 void *dp, *dend;
149 int dlen;
150 char is_enc;
151 struct timespec validity;
152 void *tp, *tpend;
153 void **ptp;
154 struct ceph_crypto_key new_session_key = { 0 };
155 struct ceph_buffer *new_ticket_blob;
156 unsigned long new_expires, new_renew_after;
157 u64 new_secret_id;
158 int ret;
159
160 ceph_decode_need(p, end, sizeof(u32) + 1, bad);
161
162 type = ceph_decode_32(p);
163 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
164
165 tkt_struct_v = ceph_decode_8(p);
166 if (tkt_struct_v != 1)
167 goto bad;
168
169 th = get_ticket_handler(ac, type);
170 if (IS_ERR(th)) {
171 ret = PTR_ERR(th);
172 goto out;
173 }
174
175
176 dp = *p + ceph_x_encrypt_offset();
177 ret = ceph_x_decrypt(secret, p, end);
178 if (ret < 0)
179 goto out;
180 dout(" decrypted %d bytes\n", ret);
181 dend = dp + ret;
182
183 tkt_struct_v = ceph_decode_8(&dp);
184 if (tkt_struct_v != 1)
185 goto bad;
186
187 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
188 if (ret)
189 goto out;
190
191 ceph_decode_timespec(&validity, dp);
192 dp += sizeof(struct ceph_timespec);
193 new_expires = get_seconds() + validity.tv_sec;
194 new_renew_after = new_expires - (validity.tv_sec / 4);
195 dout(" expires=%lu renew_after=%lu\n", new_expires,
196 new_renew_after);
197
198
199 ceph_decode_8_safe(p, end, is_enc, bad);
200 if (is_enc) {
201
202 tp = *p + ceph_x_encrypt_offset();
203 ret = ceph_x_decrypt(&th->session_key, p, end);
204 if (ret < 0)
205 goto out;
206 dout(" encrypted ticket, decrypted %d bytes\n", ret);
207 ptp = &tp;
208 tpend = tp + ret;
209 } else {
210
211 ptp = p;
212 tpend = end;
213 }
214 ceph_decode_32_safe(ptp, tpend, dlen, bad);
215 dout(" ticket blob is %d bytes\n", dlen);
216 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
217 blob_struct_v = ceph_decode_8(ptp);
218 if (blob_struct_v != 1)
219 goto bad;
220
221 new_secret_id = ceph_decode_64(ptp);
222 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
223 if (ret)
224 goto out;
225
226
227 ceph_crypto_key_destroy(&th->session_key);
228 if (th->ticket_blob)
229 ceph_buffer_put(th->ticket_blob);
230 th->session_key = new_session_key;
231 th->ticket_blob = new_ticket_blob;
232 th->secret_id = new_secret_id;
233 th->expires = new_expires;
234 th->renew_after = new_renew_after;
235 th->have_key = true;
236 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
237 type, ceph_entity_type_name(type), th->secret_id,
238 (int)th->ticket_blob->vec.iov_len);
239 xi->have_keys |= th->service;
240 return 0;
241
242bad:
243 ret = -EINVAL;
244out:
245 ceph_crypto_key_destroy(&new_session_key);
246 return ret;
247}
248
249static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
250 struct ceph_crypto_key *secret,
251 void *buf, void *end)
252{
253 void *p = buf;
254 u8 reply_struct_v;
255 u32 num;
256 int ret;
257
258 ceph_decode_8_safe(&p, end, reply_struct_v, bad);
259 if (reply_struct_v != 1)
260 return -EINVAL;
261
262 ceph_decode_32_safe(&p, end, num, bad);
263 dout("%d tickets\n", num);
264
265 while (num--) {
266 ret = process_one_ticket(ac, secret, &p, end);
267 if (ret)
268 return ret;
269 }
270
271 return 0;
272
273bad:
274 return -EINVAL;
275}
276
277static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
278{
279 ceph_crypto_key_destroy(&au->session_key);
280 if (au->buf) {
281 ceph_buffer_put(au->buf);
282 au->buf = NULL;
283 }
284}
285
286static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
287 struct ceph_x_ticket_handler *th,
288 struct ceph_x_authorizer *au)
289{
290 int maxlen;
291 struct ceph_x_authorize_a *msg_a;
292 struct ceph_x_authorize_b *msg_b;
293 void *p, *end;
294 int ret;
295 int ticket_blob_len =
296 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
297
298 dout("build_authorizer for %s %p\n",
299 ceph_entity_type_name(th->service), au);
300
301 ceph_crypto_key_destroy(&au->session_key);
302 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
303 if (ret)
304 goto out_au;
305
306 maxlen = sizeof(*msg_a) + ticket_blob_len +
307 ceph_x_encrypt_buflen(sizeof(*msg_b));
308 dout(" need len %d\n", maxlen);
309 if (au->buf && au->buf->alloc_len < maxlen) {
310 ceph_buffer_put(au->buf);
311 au->buf = NULL;
312 }
313 if (!au->buf) {
314 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
315 if (!au->buf) {
316 ret = -ENOMEM;
317 goto out_au;
318 }
319 }
320 au->service = th->service;
321 au->secret_id = th->secret_id;
322
323 msg_a = au->buf->vec.iov_base;
324 msg_a->struct_v = 1;
325 msg_a->global_id = cpu_to_le64(ac->global_id);
326 msg_a->service_id = cpu_to_le32(th->service);
327 msg_a->ticket_blob.struct_v = 1;
328 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
329 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
330 if (ticket_blob_len) {
331 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
332 th->ticket_blob->vec.iov_len);
333 }
334 dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
335 le64_to_cpu(msg_a->ticket_blob.secret_id));
336
337 p = msg_a + 1;
338 p += ticket_blob_len;
339 end = au->buf->vec.iov_base + au->buf->vec.iov_len;
340
341 msg_b = p + ceph_x_encrypt_offset();
342 msg_b->struct_v = 1;
343 get_random_bytes(&au->nonce, sizeof(au->nonce));
344 msg_b->nonce = cpu_to_le64(au->nonce);
345 ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
346 if (ret < 0)
347 goto out_au;
348
349 p += ret;
350 WARN_ON(p > end);
351 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
352 dout(" built authorizer nonce %llx len %d\n", au->nonce,
353 (int)au->buf->vec.iov_len);
354 return 0;
355
356out_au:
357 ceph_x_authorizer_cleanup(au);
358 return ret;
359}
360
361static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
362 void **p, void *end)
363{
364 ceph_decode_need(p, end, 1 + sizeof(u64), bad);
365 ceph_encode_8(p, 1);
366 ceph_encode_64(p, th->secret_id);
367 if (th->ticket_blob) {
368 const char *buf = th->ticket_blob->vec.iov_base;
369 u32 len = th->ticket_blob->vec.iov_len;
370
371 ceph_encode_32_safe(p, end, len, bad);
372 ceph_encode_copy_safe(p, end, buf, len, bad);
373 } else {
374 ceph_encode_32_safe(p, end, 0, bad);
375 }
376
377 return 0;
378bad:
379 return -ERANGE;
380}
381
382static bool need_key(struct ceph_x_ticket_handler *th)
383{
384 if (!th->have_key)
385 return true;
386
387 return get_seconds() >= th->renew_after;
388}
389
390static bool have_key(struct ceph_x_ticket_handler *th)
391{
392 if (th->have_key) {
393 if (get_seconds() >= th->expires)
394 th->have_key = false;
395 }
396
397 return th->have_key;
398}
399
400static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
401{
402 int want = ac->want_keys;
403 struct ceph_x_info *xi = ac->private;
404 int service;
405
406 *pneed = ac->want_keys & ~(xi->have_keys);
407
408 for (service = 1; service <= want; service <<= 1) {
409 struct ceph_x_ticket_handler *th;
410
411 if (!(ac->want_keys & service))
412 continue;
413
414 if (*pneed & service)
415 continue;
416
417 th = get_ticket_handler(ac, service);
418 if (IS_ERR(th)) {
419 *pneed |= service;
420 continue;
421 }
422
423 if (need_key(th))
424 *pneed |= service;
425 if (!have_key(th))
426 xi->have_keys &= ~service;
427 }
428}
429
430static int ceph_x_build_request(struct ceph_auth_client *ac,
431 void *buf, void *end)
432{
433 struct ceph_x_info *xi = ac->private;
434 int need;
435 struct ceph_x_request_header *head = buf;
436 int ret;
437 struct ceph_x_ticket_handler *th =
438 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
439
440 if (IS_ERR(th))
441 return PTR_ERR(th);
442
443 ceph_x_validate_tickets(ac, &need);
444
445 dout("build_request want %x have %x need %x\n",
446 ac->want_keys, xi->have_keys, need);
447
448 if (need & CEPH_ENTITY_TYPE_AUTH) {
449 struct ceph_x_authenticate *auth = (void *)(head + 1);
450 void *p = auth + 1;
451 void *enc_buf = xi->auth_authorizer.enc_buf;
452 struct ceph_x_challenge_blob *blob = enc_buf +
453 ceph_x_encrypt_offset();
454 u64 *u;
455
456 if (p > end)
457 return -ERANGE;
458
459 dout(" get_auth_session_key\n");
460 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
461
462
463 get_random_bytes(&auth->client_challenge, sizeof(u64));
464 blob->client_challenge = auth->client_challenge;
465 blob->server_challenge = cpu_to_le64(xi->server_challenge);
466 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
467 sizeof(*blob));
468 if (ret < 0)
469 return ret;
470
471 auth->struct_v = 1;
472 auth->key = 0;
473 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
474 auth->key ^= *(__le64 *)u;
475 dout(" server_challenge %llx client_challenge %llx key %llx\n",
476 xi->server_challenge, le64_to_cpu(auth->client_challenge),
477 le64_to_cpu(auth->key));
478
479
480 ret = ceph_x_encode_ticket(th, &p, end);
481 if (ret < 0)
482 return ret;
483
484 return p - buf;
485 }
486
487 if (need) {
488 void *p = head + 1;
489 struct ceph_x_service_ticket_request *req;
490
491 if (p > end)
492 return -ERANGE;
493 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
494
495 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
496 if (ret)
497 return ret;
498 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
499 xi->auth_authorizer.buf->vec.iov_len);
500
501 req = p;
502 req->keys = cpu_to_le32(need);
503 p += sizeof(*req);
504 return p - buf;
505 }
506
507 return 0;
508}
509
510static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
511 void *buf, void *end)
512{
513 struct ceph_x_info *xi = ac->private;
514 struct ceph_x_reply_header *head = buf;
515 struct ceph_x_ticket_handler *th;
516 int len = end - buf;
517 int op;
518 int ret;
519
520 if (result)
521 return result;
522
523 if (xi->starting) {
524
525 struct ceph_x_server_challenge *sc = buf;
526
527 if (len != sizeof(*sc))
528 return -EINVAL;
529 xi->server_challenge = le64_to_cpu(sc->server_challenge);
530 dout("handle_reply got server challenge %llx\n",
531 xi->server_challenge);
532 xi->starting = false;
533 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
534 return -EAGAIN;
535 }
536
537 op = le16_to_cpu(head->op);
538 result = le32_to_cpu(head->result);
539 dout("handle_reply op %d result %d\n", op, result);
540 switch (op) {
541 case CEPHX_GET_AUTH_SESSION_KEY:
542
543 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
544 buf + sizeof(*head), end);
545 break;
546
547 case CEPHX_GET_PRINCIPAL_SESSION_KEY:
548 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
549 if (IS_ERR(th))
550 return PTR_ERR(th);
551 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
552 buf + sizeof(*head), end);
553 break;
554
555 default:
556 return -EINVAL;
557 }
558 if (ret)
559 return ret;
560 if (ac->want_keys == xi->have_keys)
561 return 0;
562 return -EAGAIN;
563}
564
565static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
566{
567 struct ceph_x_authorizer *au = (void *)a;
568
569 ceph_x_authorizer_cleanup(au);
570 kfree(au);
571}
572
573static int ceph_x_create_authorizer(
574 struct ceph_auth_client *ac, int peer_type,
575 struct ceph_auth_handshake *auth)
576{
577 struct ceph_x_authorizer *au;
578 struct ceph_x_ticket_handler *th;
579 int ret;
580
581 th = get_ticket_handler(ac, peer_type);
582 if (IS_ERR(th))
583 return PTR_ERR(th);
584
585 au = kzalloc(sizeof(*au), GFP_NOFS);
586 if (!au)
587 return -ENOMEM;
588
589 au->base.destroy = ceph_x_destroy_authorizer;
590
591 ret = ceph_x_build_authorizer(ac, th, au);
592 if (ret) {
593 kfree(au);
594 return ret;
595 }
596
597 auth->authorizer = (struct ceph_authorizer *) au;
598 auth->authorizer_buf = au->buf->vec.iov_base;
599 auth->authorizer_buf_len = au->buf->vec.iov_len;
600 auth->authorizer_reply_buf = au->enc_buf;
601 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
602 auth->sign_message = ac->ops->sign_message;
603 auth->check_message_signature = ac->ops->check_message_signature;
604
605 return 0;
606}
607
608static int ceph_x_update_authorizer(
609 struct ceph_auth_client *ac, int peer_type,
610 struct ceph_auth_handshake *auth)
611{
612 struct ceph_x_authorizer *au;
613 struct ceph_x_ticket_handler *th;
614
615 th = get_ticket_handler(ac, peer_type);
616 if (IS_ERR(th))
617 return PTR_ERR(th);
618
619 au = (struct ceph_x_authorizer *)auth->authorizer;
620 if (au->secret_id < th->secret_id) {
621 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
622 au->service, au->secret_id, th->secret_id);
623 return ceph_x_build_authorizer(ac, th, au);
624 }
625 return 0;
626}
627
628static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
629 struct ceph_authorizer *a)
630{
631 struct ceph_x_authorizer *au = (void *)a;
632 void *p = au->enc_buf;
633 struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
634 int ret;
635
636 ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
637 if (ret < 0)
638 return ret;
639 if (ret != sizeof(*reply))
640 return -EPERM;
641
642 if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
643 ret = -EPERM;
644 else
645 ret = 0;
646 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
647 au->nonce, le64_to_cpu(reply->nonce_plus_one), ret);
648 return ret;
649}
650
651static void ceph_x_reset(struct ceph_auth_client *ac)
652{
653 struct ceph_x_info *xi = ac->private;
654
655 dout("reset\n");
656 xi->starting = true;
657 xi->server_challenge = 0;
658}
659
660static void ceph_x_destroy(struct ceph_auth_client *ac)
661{
662 struct ceph_x_info *xi = ac->private;
663 struct rb_node *p;
664
665 dout("ceph_x_destroy %p\n", ac);
666 ceph_crypto_key_destroy(&xi->secret);
667
668 while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
669 struct ceph_x_ticket_handler *th =
670 rb_entry(p, struct ceph_x_ticket_handler, node);
671 remove_ticket_handler(ac, th);
672 }
673
674 ceph_x_authorizer_cleanup(&xi->auth_authorizer);
675
676 kfree(ac->private);
677 ac->private = NULL;
678}
679
680static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
681{
682 struct ceph_x_ticket_handler *th;
683
684 th = get_ticket_handler(ac, peer_type);
685 if (!IS_ERR(th))
686 th->have_key = false;
687}
688
689static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
690 int peer_type)
691{
692
693
694
695
696
697
698 invalidate_ticket(ac, peer_type);
699 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
700}
701
702static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
703 __le64 *psig)
704{
705 void *enc_buf = au->enc_buf;
706 struct {
707 __le32 len;
708 __le32 header_crc;
709 __le32 front_crc;
710 __le32 middle_crc;
711 __le32 data_crc;
712 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
713 int ret;
714
715 sigblock->len = cpu_to_le32(4*sizeof(u32));
716 sigblock->header_crc = msg->hdr.crc;
717 sigblock->front_crc = msg->footer.front_crc;
718 sigblock->middle_crc = msg->footer.middle_crc;
719 sigblock->data_crc = msg->footer.data_crc;
720 ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN,
721 sizeof(*sigblock));
722 if (ret < 0)
723 return ret;
724
725 *psig = *(__le64 *)(enc_buf + sizeof(u32));
726 return 0;
727}
728
729static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
730 struct ceph_msg *msg)
731{
732 __le64 sig;
733 int ret;
734
735 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
736 return 0;
737
738 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
739 msg, &sig);
740 if (ret)
741 return ret;
742
743 msg->footer.sig = sig;
744 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
745 return 0;
746}
747
748static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
749 struct ceph_msg *msg)
750{
751 __le64 sig_check;
752 int ret;
753
754 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
755 return 0;
756
757 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
758 msg, &sig_check);
759 if (ret)
760 return ret;
761 if (sig_check == msg->footer.sig)
762 return 0;
763 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
764 dout("ceph_x_check_message_signature %p has signature %llx "
765 "expect %llx\n", msg, msg->footer.sig, sig_check);
766 else
767 dout("ceph_x_check_message_signature %p sender did not set "
768 "CEPH_MSG_FOOTER_SIGNED\n", msg);
769 return -EBADMSG;
770}
771
772static const struct ceph_auth_client_ops ceph_x_ops = {
773 .name = "x",
774 .is_authenticated = ceph_x_is_authenticated,
775 .should_authenticate = ceph_x_should_authenticate,
776 .build_request = ceph_x_build_request,
777 .handle_reply = ceph_x_handle_reply,
778 .create_authorizer = ceph_x_create_authorizer,
779 .update_authorizer = ceph_x_update_authorizer,
780 .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
781 .invalidate_authorizer = ceph_x_invalidate_authorizer,
782 .reset = ceph_x_reset,
783 .destroy = ceph_x_destroy,
784 .sign_message = ceph_x_sign_message,
785 .check_message_signature = ceph_x_check_message_signature,
786};
787
788
789int ceph_x_init(struct ceph_auth_client *ac)
790{
791 struct ceph_x_info *xi;
792 int ret;
793
794 dout("ceph_x_init %p\n", ac);
795 ret = -ENOMEM;
796 xi = kzalloc(sizeof(*xi), GFP_NOFS);
797 if (!xi)
798 goto out;
799
800 ret = -EINVAL;
801 if (!ac->key) {
802 pr_err("no secret set (for auth_x protocol)\n");
803 goto out_nomem;
804 }
805
806 ret = ceph_crypto_key_clone(&xi->secret, ac->key);
807 if (ret < 0) {
808 pr_err("cannot clone key: %d\n", ret);
809 goto out_nomem;
810 }
811
812 xi->starting = true;
813 xi->ticket_handlers = RB_ROOT;
814
815 ac->protocol = CEPH_AUTH_CEPHX;
816 ac->private = xi;
817 ac->ops = &ceph_x_ops;
818 return 0;
819
820out_nomem:
821 kfree(xi);
822out:
823 return ret;
824}
825
826
827
