This source file includes following definitions.
- ceph_x_is_authenticated
- ceph_x_should_authenticate
- ceph_x_encrypt_offset
- ceph_x_encrypt_buflen
- ceph_x_encrypt
- __ceph_x_decrypt
- ceph_x_decrypt
- get_ticket_handler
- remove_ticket_handler
- process_one_ticket
- ceph_x_proc_ticket_reply
- encrypt_authorizer
- ceph_x_authorizer_cleanup
- ceph_x_build_authorizer
- ceph_x_encode_ticket
- need_key
- have_key
- ceph_x_validate_tickets
- ceph_x_build_request
- ceph_x_handle_reply
- ceph_x_destroy_authorizer
- ceph_x_create_authorizer
- ceph_x_update_authorizer
- decrypt_authorize_challenge
- ceph_x_add_authorizer_challenge
- ceph_x_verify_authorizer_reply
- ceph_x_reset
- ceph_x_destroy
- invalidate_ticket
- ceph_x_invalidate_authorizer
- calc_signature
- ceph_x_sign_message
- ceph_x_check_message_signature
- ceph_x_init
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/ceph_features.h>
13 #include <linux/ceph/libceph.h>
14 #include <linux/ceph/messenger.h>
15
16 #include "crypto.h"
17 #include "auth_x.h"
18 #include "auth_x_protocol.h"
19
20 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
21
22 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
23 {
24 struct ceph_x_info *xi = ac->private;
25 int need;
26
27 ceph_x_validate_tickets(ac, &need);
28 dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
29 ac->want_keys, need, xi->have_keys);
30 return (ac->want_keys & xi->have_keys) == ac->want_keys;
31 }
32
33 static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
34 {
35 struct ceph_x_info *xi = ac->private;
36 int need;
37
38 ceph_x_validate_tickets(ac, &need);
39 dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
40 ac->want_keys, need, xi->have_keys);
41 return need != 0;
42 }
43
44 static int ceph_x_encrypt_offset(void)
45 {
46 return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
47 }
48
49 static int ceph_x_encrypt_buflen(int ilen)
50 {
51 return ceph_x_encrypt_offset() + ilen + 16;
52 }
53
54 static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
55 int buf_len, int plaintext_len)
56 {
57 struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
58 int ciphertext_len;
59 int ret;
60
61 hdr->struct_v = 1;
62 hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
63
64 ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
65 plaintext_len + sizeof(struct ceph_x_encrypt_header),
66 &ciphertext_len);
67 if (ret)
68 return ret;
69
70 ceph_encode_32(&buf, ciphertext_len);
71 return sizeof(u32) + ciphertext_len;
72 }
73
74 static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p,
75 int ciphertext_len)
76 {
77 struct ceph_x_encrypt_header *hdr = p;
78 int plaintext_len;
79 int ret;
80
81 ret = ceph_crypt(secret, false, p, ciphertext_len, ciphertext_len,
82 &plaintext_len);
83 if (ret)
84 return ret;
85
86 if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) {
87 pr_err("%s bad magic\n", __func__);
88 return -EINVAL;
89 }
90
91 return plaintext_len - sizeof(*hdr);
92 }
93
94 static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
95 {
96 int ciphertext_len;
97 int ret;
98
99 ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
100 ceph_decode_need(p, end, ciphertext_len, e_inval);
101
102 ret = __ceph_x_decrypt(secret, *p, ciphertext_len);
103 if (ret < 0)
104 return ret;
105
106 *p += ciphertext_len;
107 return ret;
108
109 e_inval:
110 return -EINVAL;
111 }
112
113
114
115
116 static struct ceph_x_ticket_handler *
117 get_ticket_handler(struct ceph_auth_client *ac, int service)
118 {
119 struct ceph_x_ticket_handler *th;
120 struct ceph_x_info *xi = ac->private;
121 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
122
123 while (*p) {
124 parent = *p;
125 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
126 if (service < th->service)
127 p = &(*p)->rb_left;
128 else if (service > th->service)
129 p = &(*p)->rb_right;
130 else
131 return th;
132 }
133
134
135 th = kzalloc(sizeof(*th), GFP_NOFS);
136 if (!th)
137 return ERR_PTR(-ENOMEM);
138 th->service = service;
139 rb_link_node(&th->node, parent, p);
140 rb_insert_color(&th->node, &xi->ticket_handlers);
141 return th;
142 }
143
144 static void remove_ticket_handler(struct ceph_auth_client *ac,
145 struct ceph_x_ticket_handler *th)
146 {
147 struct ceph_x_info *xi = ac->private;
148
149 dout("remove_ticket_handler %p %d\n", th, th->service);
150 rb_erase(&th->node, &xi->ticket_handlers);
151 ceph_crypto_key_destroy(&th->session_key);
152 if (th->ticket_blob)
153 ceph_buffer_put(th->ticket_blob);
154 kfree(th);
155 }
156
157 static int process_one_ticket(struct ceph_auth_client *ac,
158 struct ceph_crypto_key *secret,
159 void **p, void *end)
160 {
161 struct ceph_x_info *xi = ac->private;
162 int type;
163 u8 tkt_struct_v, blob_struct_v;
164 struct ceph_x_ticket_handler *th;
165 void *dp, *dend;
166 int dlen;
167 char is_enc;
168 struct timespec64 validity;
169 void *tp, *tpend;
170 void **ptp;
171 struct ceph_crypto_key new_session_key = { 0 };
172 struct ceph_buffer *new_ticket_blob;
173 time64_t new_expires, new_renew_after;
174 u64 new_secret_id;
175 int ret;
176
177 ceph_decode_need(p, end, sizeof(u32) + 1, bad);
178
179 type = ceph_decode_32(p);
180 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
181
182 tkt_struct_v = ceph_decode_8(p);
183 if (tkt_struct_v != 1)
184 goto bad;
185
186 th = get_ticket_handler(ac, type);
187 if (IS_ERR(th)) {
188 ret = PTR_ERR(th);
189 goto out;
190 }
191
192
193 dp = *p + ceph_x_encrypt_offset();
194 ret = ceph_x_decrypt(secret, p, end);
195 if (ret < 0)
196 goto out;
197 dout(" decrypted %d bytes\n", ret);
198 dend = dp + ret;
199
200 tkt_struct_v = ceph_decode_8(&dp);
201 if (tkt_struct_v != 1)
202 goto bad;
203
204 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
205 if (ret)
206 goto out;
207
208 ceph_decode_timespec64(&validity, dp);
209 dp += sizeof(struct ceph_timespec);
210 new_expires = ktime_get_real_seconds() + validity.tv_sec;
211 new_renew_after = new_expires - (validity.tv_sec / 4);
212 dout(" expires=%llu renew_after=%llu\n", new_expires,
213 new_renew_after);
214
215
216 ceph_decode_8_safe(p, end, is_enc, bad);
217 if (is_enc) {
218
219 tp = *p + ceph_x_encrypt_offset();
220 ret = ceph_x_decrypt(&th->session_key, p, end);
221 if (ret < 0)
222 goto out;
223 dout(" encrypted ticket, decrypted %d bytes\n", ret);
224 ptp = &tp;
225 tpend = tp + ret;
226 } else {
227
228 ptp = p;
229 tpend = end;
230 }
231 ceph_decode_32_safe(ptp, tpend, dlen, bad);
232 dout(" ticket blob is %d bytes\n", dlen);
233 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
234 blob_struct_v = ceph_decode_8(ptp);
235 if (blob_struct_v != 1)
236 goto bad;
237
238 new_secret_id = ceph_decode_64(ptp);
239 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
240 if (ret)
241 goto out;
242
243
244 ceph_crypto_key_destroy(&th->session_key);
245 if (th->ticket_blob)
246 ceph_buffer_put(th->ticket_blob);
247 th->session_key = new_session_key;
248 th->ticket_blob = new_ticket_blob;
249 th->secret_id = new_secret_id;
250 th->expires = new_expires;
251 th->renew_after = new_renew_after;
252 th->have_key = true;
253 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
254 type, ceph_entity_type_name(type), th->secret_id,
255 (int)th->ticket_blob->vec.iov_len);
256 xi->have_keys |= th->service;
257 return 0;
258
259 bad:
260 ret = -EINVAL;
261 out:
262 ceph_crypto_key_destroy(&new_session_key);
263 return ret;
264 }
265
266 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
267 struct ceph_crypto_key *secret,
268 void *buf, void *end)
269 {
270 void *p = buf;
271 u8 reply_struct_v;
272 u32 num;
273 int ret;
274
275 ceph_decode_8_safe(&p, end, reply_struct_v, bad);
276 if (reply_struct_v != 1)
277 return -EINVAL;
278
279 ceph_decode_32_safe(&p, end, num, bad);
280 dout("%d tickets\n", num);
281
282 while (num--) {
283 ret = process_one_ticket(ac, secret, &p, end);
284 if (ret)
285 return ret;
286 }
287
288 return 0;
289
290 bad:
291 return -EINVAL;
292 }
293
294
295
296
297
298
299 static int encrypt_authorizer(struct ceph_x_authorizer *au,
300 u64 *server_challenge)
301 {
302 struct ceph_x_authorize_a *msg_a;
303 struct ceph_x_authorize_b *msg_b;
304 void *p, *end;
305 int ret;
306
307 msg_a = au->buf->vec.iov_base;
308 WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id));
309 p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len);
310 end = au->buf->vec.iov_base + au->buf->vec.iov_len;
311
312 msg_b = p + ceph_x_encrypt_offset();
313 msg_b->struct_v = 2;
314 msg_b->nonce = cpu_to_le64(au->nonce);
315 if (server_challenge) {
316 msg_b->have_challenge = 1;
317 msg_b->server_challenge_plus_one =
318 cpu_to_le64(*server_challenge + 1);
319 } else {
320 msg_b->have_challenge = 0;
321 msg_b->server_challenge_plus_one = 0;
322 }
323
324 ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
325 if (ret < 0)
326 return ret;
327
328 p += ret;
329 if (server_challenge) {
330 WARN_ON(p != end);
331 } else {
332 WARN_ON(p > end);
333 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
334 }
335
336 return 0;
337 }
338
339 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
340 {
341 ceph_crypto_key_destroy(&au->session_key);
342 if (au->buf) {
343 ceph_buffer_put(au->buf);
344 au->buf = NULL;
345 }
346 }
347
348 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
349 struct ceph_x_ticket_handler *th,
350 struct ceph_x_authorizer *au)
351 {
352 int maxlen;
353 struct ceph_x_authorize_a *msg_a;
354 struct ceph_x_authorize_b *msg_b;
355 int ret;
356 int ticket_blob_len =
357 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
358
359 dout("build_authorizer for %s %p\n",
360 ceph_entity_type_name(th->service), au);
361
362 ceph_crypto_key_destroy(&au->session_key);
363 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
364 if (ret)
365 goto out_au;
366
367 maxlen = sizeof(*msg_a) + ticket_blob_len +
368 ceph_x_encrypt_buflen(sizeof(*msg_b));
369 dout(" need len %d\n", maxlen);
370 if (au->buf && au->buf->alloc_len < maxlen) {
371 ceph_buffer_put(au->buf);
372 au->buf = NULL;
373 }
374 if (!au->buf) {
375 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
376 if (!au->buf) {
377 ret = -ENOMEM;
378 goto out_au;
379 }
380 }
381 au->service = th->service;
382 au->secret_id = th->secret_id;
383
384 msg_a = au->buf->vec.iov_base;
385 msg_a->struct_v = 1;
386 msg_a->global_id = cpu_to_le64(ac->global_id);
387 msg_a->service_id = cpu_to_le32(th->service);
388 msg_a->ticket_blob.struct_v = 1;
389 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
390 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
391 if (ticket_blob_len) {
392 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
393 th->ticket_blob->vec.iov_len);
394 }
395 dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
396 le64_to_cpu(msg_a->ticket_blob.secret_id));
397
398 get_random_bytes(&au->nonce, sizeof(au->nonce));
399 ret = encrypt_authorizer(au, NULL);
400 if (ret) {
401 pr_err("failed to encrypt authorizer: %d", ret);
402 goto out_au;
403 }
404
405 dout(" built authorizer nonce %llx len %d\n", au->nonce,
406 (int)au->buf->vec.iov_len);
407 return 0;
408
409 out_au:
410 ceph_x_authorizer_cleanup(au);
411 return ret;
412 }
413
414 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
415 void **p, void *end)
416 {
417 ceph_decode_need(p, end, 1 + sizeof(u64), bad);
418 ceph_encode_8(p, 1);
419 ceph_encode_64(p, th->secret_id);
420 if (th->ticket_blob) {
421 const char *buf = th->ticket_blob->vec.iov_base;
422 u32 len = th->ticket_blob->vec.iov_len;
423
424 ceph_encode_32_safe(p, end, len, bad);
425 ceph_encode_copy_safe(p, end, buf, len, bad);
426 } else {
427 ceph_encode_32_safe(p, end, 0, bad);
428 }
429
430 return 0;
431 bad:
432 return -ERANGE;
433 }
434
435 static bool need_key(struct ceph_x_ticket_handler *th)
436 {
437 if (!th->have_key)
438 return true;
439
440 return ktime_get_real_seconds() >= th->renew_after;
441 }
442
443 static bool have_key(struct ceph_x_ticket_handler *th)
444 {
445 if (th->have_key) {
446 if (ktime_get_real_seconds() >= th->expires)
447 th->have_key = false;
448 }
449
450 return th->have_key;
451 }
452
453 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
454 {
455 int want = ac->want_keys;
456 struct ceph_x_info *xi = ac->private;
457 int service;
458
459 *pneed = ac->want_keys & ~(xi->have_keys);
460
461 for (service = 1; service <= want; service <<= 1) {
462 struct ceph_x_ticket_handler *th;
463
464 if (!(ac->want_keys & service))
465 continue;
466
467 if (*pneed & service)
468 continue;
469
470 th = get_ticket_handler(ac, service);
471 if (IS_ERR(th)) {
472 *pneed |= service;
473 continue;
474 }
475
476 if (need_key(th))
477 *pneed |= service;
478 if (!have_key(th))
479 xi->have_keys &= ~service;
480 }
481 }
482
483 static int ceph_x_build_request(struct ceph_auth_client *ac,
484 void *buf, void *end)
485 {
486 struct ceph_x_info *xi = ac->private;
487 int need;
488 struct ceph_x_request_header *head = buf;
489 int ret;
490 struct ceph_x_ticket_handler *th =
491 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
492
493 if (IS_ERR(th))
494 return PTR_ERR(th);
495
496 ceph_x_validate_tickets(ac, &need);
497
498 dout("build_request want %x have %x need %x\n",
499 ac->want_keys, xi->have_keys, need);
500
501 if (need & CEPH_ENTITY_TYPE_AUTH) {
502 struct ceph_x_authenticate *auth = (void *)(head + 1);
503 void *p = auth + 1;
504 void *enc_buf = xi->auth_authorizer.enc_buf;
505 struct ceph_x_challenge_blob *blob = enc_buf +
506 ceph_x_encrypt_offset();
507 u64 *u;
508
509 if (p > end)
510 return -ERANGE;
511
512 dout(" get_auth_session_key\n");
513 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
514
515
516 get_random_bytes(&auth->client_challenge, sizeof(u64));
517 blob->client_challenge = auth->client_challenge;
518 blob->server_challenge = cpu_to_le64(xi->server_challenge);
519 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
520 sizeof(*blob));
521 if (ret < 0)
522 return ret;
523
524 auth->struct_v = 1;
525 auth->key = 0;
526 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
527 auth->key ^= *(__le64 *)u;
528 dout(" server_challenge %llx client_challenge %llx key %llx\n",
529 xi->server_challenge, le64_to_cpu(auth->client_challenge),
530 le64_to_cpu(auth->key));
531
532
533 ret = ceph_x_encode_ticket(th, &p, end);
534 if (ret < 0)
535 return ret;
536
537 return p - buf;
538 }
539
540 if (need) {
541 void *p = head + 1;
542 struct ceph_x_service_ticket_request *req;
543
544 if (p > end)
545 return -ERANGE;
546 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
547
548 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
549 if (ret)
550 return ret;
551 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
552 xi->auth_authorizer.buf->vec.iov_len);
553
554 req = p;
555 req->keys = cpu_to_le32(need);
556 p += sizeof(*req);
557 return p - buf;
558 }
559
560 return 0;
561 }
562
563 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
564 void *buf, void *end)
565 {
566 struct ceph_x_info *xi = ac->private;
567 struct ceph_x_reply_header *head = buf;
568 struct ceph_x_ticket_handler *th;
569 int len = end - buf;
570 int op;
571 int ret;
572
573 if (result)
574 return result;
575
576 if (xi->starting) {
577
578 struct ceph_x_server_challenge *sc = buf;
579
580 if (len != sizeof(*sc))
581 return -EINVAL;
582 xi->server_challenge = le64_to_cpu(sc->server_challenge);
583 dout("handle_reply got server challenge %llx\n",
584 xi->server_challenge);
585 xi->starting = false;
586 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
587 return -EAGAIN;
588 }
589
590 op = le16_to_cpu(head->op);
591 result = le32_to_cpu(head->result);
592 dout("handle_reply op %d result %d\n", op, result);
593 switch (op) {
594 case CEPHX_GET_AUTH_SESSION_KEY:
595
596 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
597 buf + sizeof(*head), end);
598 break;
599
600 case CEPHX_GET_PRINCIPAL_SESSION_KEY:
601 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
602 if (IS_ERR(th))
603 return PTR_ERR(th);
604 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
605 buf + sizeof(*head), end);
606 break;
607
608 default:
609 return -EINVAL;
610 }
611 if (ret)
612 return ret;
613 if (ac->want_keys == xi->have_keys)
614 return 0;
615 return -EAGAIN;
616 }
617
618 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
619 {
620 struct ceph_x_authorizer *au = (void *)a;
621
622 ceph_x_authorizer_cleanup(au);
623 kfree(au);
624 }
625
626 static int ceph_x_create_authorizer(
627 struct ceph_auth_client *ac, int peer_type,
628 struct ceph_auth_handshake *auth)
629 {
630 struct ceph_x_authorizer *au;
631 struct ceph_x_ticket_handler *th;
632 int ret;
633
634 th = get_ticket_handler(ac, peer_type);
635 if (IS_ERR(th))
636 return PTR_ERR(th);
637
638 au = kzalloc(sizeof(*au), GFP_NOFS);
639 if (!au)
640 return -ENOMEM;
641
642 au->base.destroy = ceph_x_destroy_authorizer;
643
644 ret = ceph_x_build_authorizer(ac, th, au);
645 if (ret) {
646 kfree(au);
647 return ret;
648 }
649
650 auth->authorizer = (struct ceph_authorizer *) au;
651 auth->authorizer_buf = au->buf->vec.iov_base;
652 auth->authorizer_buf_len = au->buf->vec.iov_len;
653 auth->authorizer_reply_buf = au->enc_buf;
654 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
655 auth->sign_message = ac->ops->sign_message;
656 auth->check_message_signature = ac->ops->check_message_signature;
657
658 return 0;
659 }
660
661 static int ceph_x_update_authorizer(
662 struct ceph_auth_client *ac, int peer_type,
663 struct ceph_auth_handshake *auth)
664 {
665 struct ceph_x_authorizer *au;
666 struct ceph_x_ticket_handler *th;
667
668 th = get_ticket_handler(ac, peer_type);
669 if (IS_ERR(th))
670 return PTR_ERR(th);
671
672 au = (struct ceph_x_authorizer *)auth->authorizer;
673 if (au->secret_id < th->secret_id) {
674 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
675 au->service, au->secret_id, th->secret_id);
676 return ceph_x_build_authorizer(ac, th, au);
677 }
678 return 0;
679 }
680
681 static int decrypt_authorize_challenge(struct ceph_x_authorizer *au,
682 void *challenge_buf,
683 int challenge_buf_len,
684 u64 *server_challenge)
685 {
686 struct ceph_x_authorize_challenge *ch =
687 challenge_buf + sizeof(struct ceph_x_encrypt_header);
688 int ret;
689
690
691 ret = __ceph_x_decrypt(&au->session_key, challenge_buf,
692 challenge_buf_len);
693 if (ret < 0)
694 return ret;
695 if (ret < sizeof(*ch)) {
696 pr_err("bad size %d for ceph_x_authorize_challenge\n", ret);
697 return -EINVAL;
698 }
699
700 *server_challenge = le64_to_cpu(ch->server_challenge);
701 return 0;
702 }
703
704 static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac,
705 struct ceph_authorizer *a,
706 void *challenge_buf,
707 int challenge_buf_len)
708 {
709 struct ceph_x_authorizer *au = (void *)a;
710 u64 server_challenge;
711 int ret;
712
713 ret = decrypt_authorize_challenge(au, challenge_buf, challenge_buf_len,
714 &server_challenge);
715 if (ret) {
716 pr_err("failed to decrypt authorize challenge: %d", ret);
717 return ret;
718 }
719
720 ret = encrypt_authorizer(au, &server_challenge);
721 if (ret) {
722 pr_err("failed to encrypt authorizer w/ challenge: %d", ret);
723 return ret;
724 }
725
726 return 0;
727 }
728
729 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
730 struct ceph_authorizer *a)
731 {
732 struct ceph_x_authorizer *au = (void *)a;
733 void *p = au->enc_buf;
734 struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
735 int ret;
736
737 ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
738 if (ret < 0)
739 return ret;
740 if (ret < sizeof(*reply)) {
741 pr_err("bad size %d for ceph_x_authorize_reply\n", ret);
742 return -EINVAL;
743 }
744
745 if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
746 ret = -EPERM;
747 else
748 ret = 0;
749 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
750 au->nonce, le64_to_cpu(reply->nonce_plus_one), ret);
751 return ret;
752 }
753
754 static void ceph_x_reset(struct ceph_auth_client *ac)
755 {
756 struct ceph_x_info *xi = ac->private;
757
758 dout("reset\n");
759 xi->starting = true;
760 xi->server_challenge = 0;
761 }
762
763 static void ceph_x_destroy(struct ceph_auth_client *ac)
764 {
765 struct ceph_x_info *xi = ac->private;
766 struct rb_node *p;
767
768 dout("ceph_x_destroy %p\n", ac);
769 ceph_crypto_key_destroy(&xi->secret);
770
771 while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
772 struct ceph_x_ticket_handler *th =
773 rb_entry(p, struct ceph_x_ticket_handler, node);
774 remove_ticket_handler(ac, th);
775 }
776
777 ceph_x_authorizer_cleanup(&xi->auth_authorizer);
778
779 kfree(ac->private);
780 ac->private = NULL;
781 }
782
783 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
784 {
785 struct ceph_x_ticket_handler *th;
786
787 th = get_ticket_handler(ac, peer_type);
788 if (!IS_ERR(th))
789 th->have_key = false;
790 }
791
792 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
793 int peer_type)
794 {
795
796
797
798
799
800
801 invalidate_ticket(ac, peer_type);
802 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
803 }
804
805 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
806 __le64 *psig)
807 {
808 void *enc_buf = au->enc_buf;
809 int ret;
810
811 if (!CEPH_HAVE_FEATURE(msg->con->peer_features, CEPHX_V2)) {
812 struct {
813 __le32 len;
814 __le32 header_crc;
815 __le32 front_crc;
816 __le32 middle_crc;
817 __le32 data_crc;
818 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
819
820 sigblock->len = cpu_to_le32(4*sizeof(u32));
821 sigblock->header_crc = msg->hdr.crc;
822 sigblock->front_crc = msg->footer.front_crc;
823 sigblock->middle_crc = msg->footer.middle_crc;
824 sigblock->data_crc = msg->footer.data_crc;
825
826 ret = ceph_x_encrypt(&au->session_key, enc_buf,
827 CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock));
828 if (ret < 0)
829 return ret;
830
831 *psig = *(__le64 *)(enc_buf + sizeof(u32));
832 } else {
833 struct {
834 __le32 header_crc;
835 __le32 front_crc;
836 __le32 front_len;
837 __le32 middle_crc;
838 __le32 middle_len;
839 __le32 data_crc;
840 __le32 data_len;
841 __le32 seq_lower_word;
842 } __packed *sigblock = enc_buf;
843 struct {
844 __le64 a, b, c, d;
845 } __packed *penc = enc_buf;
846 int ciphertext_len;
847
848 sigblock->header_crc = msg->hdr.crc;
849 sigblock->front_crc = msg->footer.front_crc;
850 sigblock->front_len = msg->hdr.front_len;
851 sigblock->middle_crc = msg->footer.middle_crc;
852 sigblock->middle_len = msg->hdr.middle_len;
853 sigblock->data_crc = msg->footer.data_crc;
854 sigblock->data_len = msg->hdr.data_len;
855 sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq;
856
857
858 ret = ceph_crypt(&au->session_key, true, enc_buf,
859 CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock),
860 &ciphertext_len);
861 if (ret)
862 return ret;
863
864 *psig = penc->a ^ penc->b ^ penc->c ^ penc->d;
865 }
866
867 return 0;
868 }
869
870 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
871 struct ceph_msg *msg)
872 {
873 __le64 sig;
874 int ret;
875
876 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
877 return 0;
878
879 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
880 msg, &sig);
881 if (ret)
882 return ret;
883
884 msg->footer.sig = sig;
885 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
886 return 0;
887 }
888
889 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
890 struct ceph_msg *msg)
891 {
892 __le64 sig_check;
893 int ret;
894
895 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
896 return 0;
897
898 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
899 msg, &sig_check);
900 if (ret)
901 return ret;
902 if (sig_check == msg->footer.sig)
903 return 0;
904 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
905 dout("ceph_x_check_message_signature %p has signature %llx "
906 "expect %llx\n", msg, msg->footer.sig, sig_check);
907 else
908 dout("ceph_x_check_message_signature %p sender did not set "
909 "CEPH_MSG_FOOTER_SIGNED\n", msg);
910 return -EBADMSG;
911 }
912
913 static const struct ceph_auth_client_ops ceph_x_ops = {
914 .name = "x",
915 .is_authenticated = ceph_x_is_authenticated,
916 .should_authenticate = ceph_x_should_authenticate,
917 .build_request = ceph_x_build_request,
918 .handle_reply = ceph_x_handle_reply,
919 .create_authorizer = ceph_x_create_authorizer,
920 .update_authorizer = ceph_x_update_authorizer,
921 .add_authorizer_challenge = ceph_x_add_authorizer_challenge,
922 .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
923 .invalidate_authorizer = ceph_x_invalidate_authorizer,
924 .reset = ceph_x_reset,
925 .destroy = ceph_x_destroy,
926 .sign_message = ceph_x_sign_message,
927 .check_message_signature = ceph_x_check_message_signature,
928 };
929
930
931 int ceph_x_init(struct ceph_auth_client *ac)
932 {
933 struct ceph_x_info *xi;
934 int ret;
935
936 dout("ceph_x_init %p\n", ac);
937 ret = -ENOMEM;
938 xi = kzalloc(sizeof(*xi), GFP_NOFS);
939 if (!xi)
940 goto out;
941
942 ret = -EINVAL;
943 if (!ac->key) {
944 pr_err("no secret set (for auth_x protocol)\n");
945 goto out_nomem;
946 }
947
948 ret = ceph_crypto_key_clone(&xi->secret, ac->key);
949 if (ret < 0) {
950 pr_err("cannot clone key: %d\n", ret);
951 goto out_nomem;
952 }
953
954 xi->starting = true;
955 xi->ticket_handlers = RB_ROOT;
956
957 ac->protocol = CEPH_AUTH_CEPHX;
958 ac->private = xi;
959 ac->ops = &ceph_x_ops;
960 return 0;
961
962 out_nomem:
963 kfree(xi);
964 out:
965 return ret;
966 }