1
2
3#include <linux/ceph/ceph_debug.h>
4
5#include <linux/err.h>
6#include <linux/module.h>
7#include <linux/random.h>
8#include <linux/slab.h>
9
10#include <linux/ceph/decode.h>
11#include <linux/ceph/auth.h>
12#include <linux/ceph/libceph.h>
13#include <linux/ceph/messenger.h>
14
15#include "crypto.h"
16#include "auth_x.h"
17#include "auth_x_protocol.h"
18
19static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
20
21static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
22{
23 struct ceph_x_info *xi = ac->private;
24 int need;
25
26 ceph_x_validate_tickets(ac, &need);
27 dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
28 ac->want_keys, need, xi->have_keys);
29 return (ac->want_keys & xi->have_keys) == ac->want_keys;
30}
31
32static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
33{
34 struct ceph_x_info *xi = ac->private;
35 int need;
36
37 ceph_x_validate_tickets(ac, &need);
38 dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
39 ac->want_keys, need, xi->have_keys);
40 return need != 0;
41}
42
43static int ceph_x_encrypt_offset(void)
44{
45 return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
46}
47
48static int ceph_x_encrypt_buflen(int ilen)
49{
50 return ceph_x_encrypt_offset() + ilen + 16;
51}
52
53static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
54 int buf_len, int plaintext_len)
55{
56 struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
57 int ciphertext_len;
58 int ret;
59
60 hdr->struct_v = 1;
61 hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
62
63 ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
64 plaintext_len + sizeof(struct ceph_x_encrypt_header),
65 &ciphertext_len);
66 if (ret)
67 return ret;
68
69 ceph_encode_32(&buf, ciphertext_len);
70 return sizeof(u32) + ciphertext_len;
71}
72
73static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
74{
75 struct ceph_x_encrypt_header *hdr = *p + sizeof(u32);
76 int ciphertext_len, plaintext_len;
77 int ret;
78
79 ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
80 ceph_decode_need(p, end, ciphertext_len, e_inval);
81
82 ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len,
83 &plaintext_len);
84 if (ret)
85 return ret;
86
87 if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC)
88 return -EPERM;
89
90 *p += ciphertext_len;
91 return plaintext_len - sizeof(struct ceph_x_encrypt_header);
92
93e_inval:
94 return -EINVAL;
95}
96
97
98
99
100static struct ceph_x_ticket_handler *
101get_ticket_handler(struct ceph_auth_client *ac, int service)
102{
103 struct ceph_x_ticket_handler *th;
104 struct ceph_x_info *xi = ac->private;
105 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
106
107 while (*p) {
108 parent = *p;
109 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
110 if (service < th->service)
111 p = &(*p)->rb_left;
112 else if (service > th->service)
113 p = &(*p)->rb_right;
114 else
115 return th;
116 }
117
118
119 th = kzalloc(sizeof(*th), GFP_NOFS);
120 if (!th)
121 return ERR_PTR(-ENOMEM);
122 th->service = service;
123 rb_link_node(&th->node, parent, p);
124 rb_insert_color(&th->node, &xi->ticket_handlers);
125 return th;
126}
127
128static void remove_ticket_handler(struct ceph_auth_client *ac,
129 struct ceph_x_ticket_handler *th)
130{
131 struct ceph_x_info *xi = ac->private;
132
133 dout("remove_ticket_handler %p %d\n", th, th->service);
134 rb_erase(&th->node, &xi->ticket_handlers);
135 ceph_crypto_key_destroy(&th->session_key);
136 if (th->ticket_blob)
137 ceph_buffer_put(th->ticket_blob);
138 kfree(th);
139}
140
141static int process_one_ticket(struct ceph_auth_client *ac,
142 struct ceph_crypto_key *secret,
143 void **p, void *end)
144{
145 struct ceph_x_info *xi = ac->private;
146 int type;
147 u8 tkt_struct_v, blob_struct_v;
148 struct ceph_x_ticket_handler *th;
149 void *dp, *dend;
150 int dlen;
151 char is_enc;
152 struct timespec validity;
153 void *tp, *tpend;
154 void **ptp;
155 struct ceph_crypto_key new_session_key = { 0 };
156 struct ceph_buffer *new_ticket_blob;
157 unsigned long new_expires, new_renew_after;
158 u64 new_secret_id;
159 int ret;
160
161 ceph_decode_need(p, end, sizeof(u32) + 1, bad);
162
163 type = ceph_decode_32(p);
164 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
165
166 tkt_struct_v = ceph_decode_8(p);
167 if (tkt_struct_v != 1)
168 goto bad;
169
170 th = get_ticket_handler(ac, type);
171 if (IS_ERR(th)) {
172 ret = PTR_ERR(th);
173 goto out;
174 }
175
176
177 dp = *p + ceph_x_encrypt_offset();
178 ret = ceph_x_decrypt(secret, p, end);
179 if (ret < 0)
180 goto out;
181 dout(" decrypted %d bytes\n", ret);
182 dend = dp + ret;
183
184 tkt_struct_v = ceph_decode_8(&dp);
185 if (tkt_struct_v != 1)
186 goto bad;
187
188 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
189 if (ret)
190 goto out;
191
192 ceph_decode_timespec(&validity, dp);
193 dp += sizeof(struct ceph_timespec);
194 new_expires = get_seconds() + validity.tv_sec;
195 new_renew_after = new_expires - (validity.tv_sec / 4);
196 dout(" expires=%lu renew_after=%lu\n", new_expires,
197 new_renew_after);
198
199
200 ceph_decode_8_safe(p, end, is_enc, bad);
201 if (is_enc) {
202
203 tp = *p + ceph_x_encrypt_offset();
204 ret = ceph_x_decrypt(&th->session_key, p, end);
205 if (ret < 0)
206 goto out;
207 dout(" encrypted ticket, decrypted %d bytes\n", ret);
208 ptp = &tp;
209 tpend = tp + ret;
210 } else {
211
212 ptp = p;
213 tpend = end;
214 }
215 ceph_decode_32_safe(ptp, tpend, dlen, bad);
216 dout(" ticket blob is %d bytes\n", dlen);
217 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
218 blob_struct_v = ceph_decode_8(ptp);
219 if (blob_struct_v != 1)
220 goto bad;
221
222 new_secret_id = ceph_decode_64(ptp);
223 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
224 if (ret)
225 goto out;
226
227
228 ceph_crypto_key_destroy(&th->session_key);
229 if (th->ticket_blob)
230 ceph_buffer_put(th->ticket_blob);
231 th->session_key = new_session_key;
232 th->ticket_blob = new_ticket_blob;
233 th->secret_id = new_secret_id;
234 th->expires = new_expires;
235 th->renew_after = new_renew_after;
236 th->have_key = true;
237 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
238 type, ceph_entity_type_name(type), th->secret_id,
239 (int)th->ticket_blob->vec.iov_len);
240 xi->have_keys |= th->service;
241 return 0;
242
243bad:
244 ret = -EINVAL;
245out:
246 ceph_crypto_key_destroy(&new_session_key);
247 return ret;
248}
249
250static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
251 struct ceph_crypto_key *secret,
252 void *buf, void *end)
253{
254 void *p = buf;
255 u8 reply_struct_v;
256 u32 num;
257 int ret;
258
259 ceph_decode_8_safe(&p, end, reply_struct_v, bad);
260 if (reply_struct_v != 1)
261 return -EINVAL;
262
263 ceph_decode_32_safe(&p, end, num, bad);
264 dout("%d tickets\n", num);
265
266 while (num--) {
267 ret = process_one_ticket(ac, secret, &p, end);
268 if (ret)
269 return ret;
270 }
271
272 return 0;
273
274bad:
275 return -EINVAL;
276}
277
278static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
279{
280 ceph_crypto_key_destroy(&au->session_key);
281 if (au->buf) {
282 ceph_buffer_put(au->buf);
283 au->buf = NULL;
284 }
285}
286
287static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
288 struct ceph_x_ticket_handler *th,
289 struct ceph_x_authorizer *au)
290{
291 int maxlen;
292 struct ceph_x_authorize_a *msg_a;
293 struct ceph_x_authorize_b *msg_b;
294 void *p, *end;
295 int ret;
296 int ticket_blob_len =
297 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
298
299 dout("build_authorizer for %s %p\n",
300 ceph_entity_type_name(th->service), au);
301
302 ceph_crypto_key_destroy(&au->session_key);
303 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
304 if (ret)
305 goto out_au;
306
307 maxlen = sizeof(*msg_a) + ticket_blob_len +
308 ceph_x_encrypt_buflen(sizeof(*msg_b));
309 dout(" need len %d\n", maxlen);
310 if (au->buf && au->buf->alloc_len < maxlen) {
311 ceph_buffer_put(au->buf);
312 au->buf = NULL;
313 }
314 if (!au->buf) {
315 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
316 if (!au->buf) {
317 ret = -ENOMEM;
318 goto out_au;
319 }
320 }
321 au->service = th->service;
322 au->secret_id = th->secret_id;
323
324 msg_a = au->buf->vec.iov_base;
325 msg_a->struct_v = 1;
326 msg_a->global_id = cpu_to_le64(ac->global_id);
327 msg_a->service_id = cpu_to_le32(th->service);
328 msg_a->ticket_blob.struct_v = 1;
329 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
330 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
331 if (ticket_blob_len) {
332 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
333 th->ticket_blob->vec.iov_len);
334 }
335 dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
336 le64_to_cpu(msg_a->ticket_blob.secret_id));
337
338 p = msg_a + 1;
339 p += ticket_blob_len;
340 end = au->buf->vec.iov_base + au->buf->vec.iov_len;
341
342 msg_b = p + ceph_x_encrypt_offset();
343 msg_b->struct_v = 1;
344 get_random_bytes(&au->nonce, sizeof(au->nonce));
345 msg_b->nonce = cpu_to_le64(au->nonce);
346 ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
347 if (ret < 0)
348 goto out_au;
349
350 p += ret;
351 WARN_ON(p > end);
352 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
353 dout(" built authorizer nonce %llx len %d\n", au->nonce,
354 (int)au->buf->vec.iov_len);
355 return 0;
356
357out_au:
358 ceph_x_authorizer_cleanup(au);
359 return ret;
360}
361
362static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
363 void **p, void *end)
364{
365 ceph_decode_need(p, end, 1 + sizeof(u64), bad);
366 ceph_encode_8(p, 1);
367 ceph_encode_64(p, th->secret_id);
368 if (th->ticket_blob) {
369 const char *buf = th->ticket_blob->vec.iov_base;
370 u32 len = th->ticket_blob->vec.iov_len;
371
372 ceph_encode_32_safe(p, end, len, bad);
373 ceph_encode_copy_safe(p, end, buf, len, bad);
374 } else {
375 ceph_encode_32_safe(p, end, 0, bad);
376 }
377
378 return 0;
379bad:
380 return -ERANGE;
381}
382
383static bool need_key(struct ceph_x_ticket_handler *th)
384{
385 if (!th->have_key)
386 return true;
387
388 return get_seconds() >= th->renew_after;
389}
390
391static bool have_key(struct ceph_x_ticket_handler *th)
392{
393 if (th->have_key) {
394 if (get_seconds() >= th->expires)
395 th->have_key = false;
396 }
397
398 return th->have_key;
399}
400
401static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
402{
403 int want = ac->want_keys;
404 struct ceph_x_info *xi = ac->private;
405 int service;
406
407 *pneed = ac->want_keys & ~(xi->have_keys);
408
409 for (service = 1; service <= want; service <<= 1) {
410 struct ceph_x_ticket_handler *th;
411
412 if (!(ac->want_keys & service))
413 continue;
414
415 if (*pneed & service)
416 continue;
417
418 th = get_ticket_handler(ac, service);
419 if (IS_ERR(th)) {
420 *pneed |= service;
421 continue;
422 }
423
424 if (need_key(th))
425 *pneed |= service;
426 if (!have_key(th))
427 xi->have_keys &= ~service;
428 }
429}
430
431static int ceph_x_build_request(struct ceph_auth_client *ac,
432 void *buf, void *end)
433{
434 struct ceph_x_info *xi = ac->private;
435 int need;
436 struct ceph_x_request_header *head = buf;
437 int ret;
438 struct ceph_x_ticket_handler *th =
439 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
440
441 if (IS_ERR(th))
442 return PTR_ERR(th);
443
444 ceph_x_validate_tickets(ac, &need);
445
446 dout("build_request want %x have %x need %x\n",
447 ac->want_keys, xi->have_keys, need);
448
449 if (need & CEPH_ENTITY_TYPE_AUTH) {
450 struct ceph_x_authenticate *auth = (void *)(head + 1);
451 void *p = auth + 1;
452 void *enc_buf = xi->auth_authorizer.enc_buf;
453 struct ceph_x_challenge_blob *blob = enc_buf +
454 ceph_x_encrypt_offset();
455 u64 *u;
456
457 if (p > end)
458 return -ERANGE;
459
460 dout(" get_auth_session_key\n");
461 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
462
463
464 get_random_bytes(&auth->client_challenge, sizeof(u64));
465 blob->client_challenge = auth->client_challenge;
466 blob->server_challenge = cpu_to_le64(xi->server_challenge);
467 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
468 sizeof(*blob));
469 if (ret < 0)
470 return ret;
471
472 auth->struct_v = 1;
473 auth->key = 0;
474 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
475 auth->key ^= *(__le64 *)u;
476 dout(" server_challenge %llx client_challenge %llx key %llx\n",
477 xi->server_challenge, le64_to_cpu(auth->client_challenge),
478 le64_to_cpu(auth->key));
479
480
481 ret = ceph_x_encode_ticket(th, &p, end);
482 if (ret < 0)
483 return ret;
484
485 return p - buf;
486 }
487
488 if (need) {
489 void *p = head + 1;
490 struct ceph_x_service_ticket_request *req;
491
492 if (p > end)
493 return -ERANGE;
494 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
495
496 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
497 if (ret)
498 return ret;
499 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
500 xi->auth_authorizer.buf->vec.iov_len);
501
502 req = p;
503 req->keys = cpu_to_le32(need);
504 p += sizeof(*req);
505 return p - buf;
506 }
507
508 return 0;
509}
510
511static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
512 void *buf, void *end)
513{
514 struct ceph_x_info *xi = ac->private;
515 struct ceph_x_reply_header *head = buf;
516 struct ceph_x_ticket_handler *th;
517 int len = end - buf;
518 int op;
519 int ret;
520
521 if (result)
522 return result;
523
524 if (xi->starting) {
525
526 struct ceph_x_server_challenge *sc = buf;
527
528 if (len != sizeof(*sc))
529 return -EINVAL;
530 xi->server_challenge = le64_to_cpu(sc->server_challenge);
531 dout("handle_reply got server challenge %llx\n",
532 xi->server_challenge);
533 xi->starting = false;
534 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
535 return -EAGAIN;
536 }
537
538 op = le16_to_cpu(head->op);
539 result = le32_to_cpu(head->result);
540 dout("handle_reply op %d result %d\n", op, result);
541 switch (op) {
542 case CEPHX_GET_AUTH_SESSION_KEY:
543
544 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
545 buf + sizeof(*head), end);
546 break;
547
548 case CEPHX_GET_PRINCIPAL_SESSION_KEY:
549 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
550 if (IS_ERR(th))
551 return PTR_ERR(th);
552 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
553 buf + sizeof(*head), end);
554 break;
555
556 default:
557 return -EINVAL;
558 }
559 if (ret)
560 return ret;
561 if (ac->want_keys == xi->have_keys)
562 return 0;
563 return -EAGAIN;
564}
565
566static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
567{
568 struct ceph_x_authorizer *au = (void *)a;
569
570 ceph_x_authorizer_cleanup(au);
571 kfree(au);
572}
573
574static int ceph_x_create_authorizer(
575 struct ceph_auth_client *ac, int peer_type,
576 struct ceph_auth_handshake *auth)
577{
578 struct ceph_x_authorizer *au;
579 struct ceph_x_ticket_handler *th;
580 int ret;
581
582 th = get_ticket_handler(ac, peer_type);
583 if (IS_ERR(th))
584 return PTR_ERR(th);
585
586 au = kzalloc(sizeof(*au), GFP_NOFS);
587 if (!au)
588 return -ENOMEM;
589
590 au->base.destroy = ceph_x_destroy_authorizer;
591
592 ret = ceph_x_build_authorizer(ac, th, au);
593 if (ret) {
594 kfree(au);
595 return ret;
596 }
597
598 auth->authorizer = (struct ceph_authorizer *) au;
599 auth->authorizer_buf = au->buf->vec.iov_base;
600 auth->authorizer_buf_len = au->buf->vec.iov_len;
601 auth->authorizer_reply_buf = au->enc_buf;
602 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
603 auth->sign_message = ac->ops->sign_message;
604 auth->check_message_signature = ac->ops->check_message_signature;
605
606 return 0;
607}
608
609static int ceph_x_update_authorizer(
610 struct ceph_auth_client *ac, int peer_type,
611 struct ceph_auth_handshake *auth)
612{
613 struct ceph_x_authorizer *au;
614 struct ceph_x_ticket_handler *th;
615
616 th = get_ticket_handler(ac, peer_type);
617 if (IS_ERR(th))
618 return PTR_ERR(th);
619
620 au = (struct ceph_x_authorizer *)auth->authorizer;
621 if (au->secret_id < th->secret_id) {
622 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
623 au->service, au->secret_id, th->secret_id);
624 return ceph_x_build_authorizer(ac, th, au);
625 }
626 return 0;
627}
628
629static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
630 struct ceph_authorizer *a)
631{
632 struct ceph_x_authorizer *au = (void *)a;
633 void *p = au->enc_buf;
634 struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
635 int ret;
636
637 ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
638 if (ret < 0)
639 return ret;
640 if (ret != sizeof(*reply))
641 return -EPERM;
642
643 if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
644 ret = -EPERM;
645 else
646 ret = 0;
647 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
648 au->nonce, le64_to_cpu(reply->nonce_plus_one), ret);
649 return ret;
650}
651
652static void ceph_x_reset(struct ceph_auth_client *ac)
653{
654 struct ceph_x_info *xi = ac->private;
655
656 dout("reset\n");
657 xi->starting = true;
658 xi->server_challenge = 0;
659}
660
661static void ceph_x_destroy(struct ceph_auth_client *ac)
662{
663 struct ceph_x_info *xi = ac->private;
664 struct rb_node *p;
665
666 dout("ceph_x_destroy %p\n", ac);
667 ceph_crypto_key_destroy(&xi->secret);
668
669 while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
670 struct ceph_x_ticket_handler *th =
671 rb_entry(p, struct ceph_x_ticket_handler, node);
672 remove_ticket_handler(ac, th);
673 }
674
675 ceph_x_authorizer_cleanup(&xi->auth_authorizer);
676
677 kfree(ac->private);
678 ac->private = NULL;
679}
680
681static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
682{
683 struct ceph_x_ticket_handler *th;
684
685 th = get_ticket_handler(ac, peer_type);
686 if (!IS_ERR(th))
687 th->have_key = false;
688}
689
690static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
691 int peer_type)
692{
693
694
695
696
697
698
699 invalidate_ticket(ac, peer_type);
700 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
701}
702
703static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
704 __le64 *psig)
705{
706 void *enc_buf = au->enc_buf;
707 struct {
708 __le32 len;
709 __le32 header_crc;
710 __le32 front_crc;
711 __le32 middle_crc;
712 __le32 data_crc;
713 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
714 int ret;
715
716 sigblock->len = cpu_to_le32(4*sizeof(u32));
717 sigblock->header_crc = msg->hdr.crc;
718 sigblock->front_crc = msg->footer.front_crc;
719 sigblock->middle_crc = msg->footer.middle_crc;
720 sigblock->data_crc = msg->footer.data_crc;
721 ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN,
722 sizeof(*sigblock));
723 if (ret < 0)
724 return ret;
725
726 *psig = *(__le64 *)(enc_buf + sizeof(u32));
727 return 0;
728}
729
730static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
731 struct ceph_msg *msg)
732{
733 __le64 sig;
734 int ret;
735
736 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
737 return 0;
738
739 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
740 msg, &sig);
741 if (ret)
742 return ret;
743
744 msg->footer.sig = sig;
745 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
746 return 0;
747}
748
749static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
750 struct ceph_msg *msg)
751{
752 __le64 sig_check;
753 int ret;
754
755 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
756 return 0;
757
758 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
759 msg, &sig_check);
760 if (ret)
761 return ret;
762 if (sig_check == msg->footer.sig)
763 return 0;
764 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
765 dout("ceph_x_check_message_signature %p has signature %llx "
766 "expect %llx\n", msg, msg->footer.sig, sig_check);
767 else
768 dout("ceph_x_check_message_signature %p sender did not set "
769 "CEPH_MSG_FOOTER_SIGNED\n", msg);
770 return -EBADMSG;
771}
772
773static const struct ceph_auth_client_ops ceph_x_ops = {
774 .name = "x",
775 .is_authenticated = ceph_x_is_authenticated,
776 .should_authenticate = ceph_x_should_authenticate,
777 .build_request = ceph_x_build_request,
778 .handle_reply = ceph_x_handle_reply,
779 .create_authorizer = ceph_x_create_authorizer,
780 .update_authorizer = ceph_x_update_authorizer,
781 .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
782 .invalidate_authorizer = ceph_x_invalidate_authorizer,
783 .reset = ceph_x_reset,
784 .destroy = ceph_x_destroy,
785 .sign_message = ceph_x_sign_message,
786 .check_message_signature = ceph_x_check_message_signature,
787};
788
789
790int ceph_x_init(struct ceph_auth_client *ac)
791{
792 struct ceph_x_info *xi;
793 int ret;
794
795 dout("ceph_x_init %p\n", ac);
796 ret = -ENOMEM;
797 xi = kzalloc(sizeof(*xi), GFP_NOFS);
798 if (!xi)
799 goto out;
800
801 ret = -EINVAL;
802 if (!ac->key) {
803 pr_err("no secret set (for auth_x protocol)\n");
804 goto out_nomem;
805 }
806
807 ret = ceph_crypto_key_clone(&xi->secret, ac->key);
808 if (ret < 0) {
809 pr_err("cannot clone key: %d\n", ret);
810 goto out_nomem;
811 }
812
813 xi->starting = true;
814 xi->ticket_handlers = RB_ROOT;
815
816 ac->protocol = CEPH_AUTH_CEPHX;
817 ac->private = xi;
818 ac->ops = &ceph_x_ops;
819 return 0;
820
821out_nomem:
822 kfree(xi);
823out:
824 return ret;
825}
826
827
828
