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
12#include "crypto.h"
13#include "auth_x.h"
14#include "auth_x_protocol.h"
15
16#define TEMP_TICKET_BUF_LEN 256
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_buflen(int ilen)
43{
44 return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
45 sizeof(u32);
46}
47
48static int ceph_x_encrypt(struct ceph_crypto_key *secret,
49 void *ibuf, int ilen, void *obuf, size_t olen)
50{
51 struct ceph_x_encrypt_header head = {
52 .struct_v = 1,
53 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
54 };
55 size_t len = olen - sizeof(u32);
56 int ret;
57
58 ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
59 &head, sizeof(head), ibuf, ilen);
60 if (ret)
61 return ret;
62 ceph_encode_32(&obuf, len);
63 return len + sizeof(u32);
64}
65
66static int ceph_x_decrypt(struct ceph_crypto_key *secret,
67 void **p, void *end, void *obuf, size_t olen)
68{
69 struct ceph_x_encrypt_header head;
70 size_t head_len = sizeof(head);
71 int len, ret;
72
73 len = ceph_decode_32(p);
74 if (*p + len > end)
75 return -EINVAL;
76
77 dout("ceph_x_decrypt len %d\n", len);
78 ret = ceph_decrypt2(secret, &head, &head_len, obuf, &olen,
79 *p, len);
80 if (ret)
81 return ret;
82 if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
83 return -EPERM;
84 *p += len;
85 return olen;
86}
87
88
89
90
91static struct ceph_x_ticket_handler *
92get_ticket_handler(struct ceph_auth_client *ac, int service)
93{
94 struct ceph_x_ticket_handler *th;
95 struct ceph_x_info *xi = ac->private;
96 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
97
98 while (*p) {
99 parent = *p;
100 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
101 if (service < th->service)
102 p = &(*p)->rb_left;
103 else if (service > th->service)
104 p = &(*p)->rb_right;
105 else
106 return th;
107 }
108
109
110 th = kzalloc(sizeof(*th), GFP_NOFS);
111 if (!th)
112 return ERR_PTR(-ENOMEM);
113 th->service = service;
114 rb_link_node(&th->node, parent, p);
115 rb_insert_color(&th->node, &xi->ticket_handlers);
116 return th;
117}
118
119static void remove_ticket_handler(struct ceph_auth_client *ac,
120 struct ceph_x_ticket_handler *th)
121{
122 struct ceph_x_info *xi = ac->private;
123
124 dout("remove_ticket_handler %p %d\n", th, th->service);
125 rb_erase(&th->node, &xi->ticket_handlers);
126 ceph_crypto_key_destroy(&th->session_key);
127 if (th->ticket_blob)
128 ceph_buffer_put(th->ticket_blob);
129 kfree(th);
130}
131
132static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
133 struct ceph_crypto_key *secret,
134 void *buf, void *end)
135{
136 struct ceph_x_info *xi = ac->private;
137 int num;
138 void *p = buf;
139 int ret;
140 char *dbuf;
141 char *ticket_buf;
142 u8 reply_struct_v;
143
144 dbuf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
145 if (!dbuf)
146 return -ENOMEM;
147
148 ret = -ENOMEM;
149 ticket_buf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
150 if (!ticket_buf)
151 goto out_dbuf;
152
153 ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
154 reply_struct_v = ceph_decode_8(&p);
155 if (reply_struct_v != 1)
156 goto bad;
157 num = ceph_decode_32(&p);
158 dout("%d tickets\n", num);
159 while (num--) {
160 int type;
161 u8 tkt_struct_v, blob_struct_v;
162 struct ceph_x_ticket_handler *th;
163 void *dp, *dend;
164 int dlen;
165 char is_enc;
166 struct timespec validity;
167 struct ceph_crypto_key old_key;
168 void *tp, *tpend;
169 struct ceph_timespec new_validity;
170 struct ceph_crypto_key new_session_key;
171 struct ceph_buffer *new_ticket_blob;
172 unsigned long new_expires, new_renew_after;
173 u64 new_secret_id;
174
175 ceph_decode_need(&p, end, sizeof(u32) + 1, bad);
176
177 type = ceph_decode_32(&p);
178 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
179
180 tkt_struct_v = ceph_decode_8(&p);
181 if (tkt_struct_v != 1)
182 goto bad;
183
184 th = get_ticket_handler(ac, type);
185 if (IS_ERR(th)) {
186 ret = PTR_ERR(th);
187 goto out;
188 }
189
190
191 dlen = ceph_x_decrypt(secret, &p, end, dbuf,
192 TEMP_TICKET_BUF_LEN);
193 if (dlen <= 0) {
194 ret = dlen;
195 goto out;
196 }
197 dout(" decrypted %d bytes\n", dlen);
198 dend = dbuf + dlen;
199 dp = dbuf;
200
201 tkt_struct_v = ceph_decode_8(&dp);
202 if (tkt_struct_v != 1)
203 goto bad;
204
205 memcpy(&old_key, &th->session_key, sizeof(old_key));
206 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
207 if (ret)
208 goto out;
209
210 ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
211 ceph_decode_timespec(&validity, &new_validity);
212 new_expires = get_seconds() + validity.tv_sec;
213 new_renew_after = new_expires - (validity.tv_sec / 4);
214 dout(" expires=%lu renew_after=%lu\n", new_expires,
215 new_renew_after);
216
217
218 ceph_decode_8_safe(&p, end, is_enc, bad);
219 tp = ticket_buf;
220 if (is_enc) {
221
222 dout(" encrypted ticket\n");
223 dlen = ceph_x_decrypt(&old_key, &p, end, ticket_buf,
224 TEMP_TICKET_BUF_LEN);
225 if (dlen < 0) {
226 ret = dlen;
227 goto out;
228 }
229 dlen = ceph_decode_32(&tp);
230 } else {
231
232 ceph_decode_32_safe(&p, end, dlen, bad);
233 ceph_decode_need(&p, end, dlen, bad);
234 ceph_decode_copy(&p, ticket_buf, dlen);
235 }
236 tpend = tp + dlen;
237 dout(" ticket blob is %d bytes\n", dlen);
238 ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
239 blob_struct_v = ceph_decode_8(&tp);
240 new_secret_id = ceph_decode_64(&tp);
241 ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
242 if (ret)
243 goto out;
244
245
246 ceph_crypto_key_destroy(&th->session_key);
247 if (th->ticket_blob)
248 ceph_buffer_put(th->ticket_blob);
249 th->session_key = new_session_key;
250 th->ticket_blob = new_ticket_blob;
251 th->validity = new_validity;
252 th->secret_id = new_secret_id;
253 th->expires = new_expires;
254 th->renew_after = new_renew_after;
255 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
256 type, ceph_entity_type_name(type), th->secret_id,
257 (int)th->ticket_blob->vec.iov_len);
258 xi->have_keys |= th->service;
259 }
260
261 ret = 0;
262out:
263 kfree(ticket_buf);
264out_dbuf:
265 kfree(dbuf);
266 return ret;
267
268bad:
269 ret = -EINVAL;
270 goto out;
271}
272
273static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
274 struct ceph_x_ticket_handler *th,
275 struct ceph_x_authorizer *au)
276{
277 int maxlen;
278 struct ceph_x_authorize_a *msg_a;
279 struct ceph_x_authorize_b msg_b;
280 void *p, *end;
281 int ret;
282 int ticket_blob_len =
283 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
284
285 dout("build_authorizer for %s %p\n",
286 ceph_entity_type_name(th->service), au);
287
288 maxlen = sizeof(*msg_a) + sizeof(msg_b) +
289 ceph_x_encrypt_buflen(ticket_blob_len);
290 dout(" need len %d\n", maxlen);
291 if (au->buf && au->buf->alloc_len < maxlen) {
292 ceph_buffer_put(au->buf);
293 au->buf = NULL;
294 }
295 if (!au->buf) {
296 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
297 if (!au->buf)
298 return -ENOMEM;
299 }
300 au->service = th->service;
301 au->secret_id = th->secret_id;
302
303 msg_a = au->buf->vec.iov_base;
304 msg_a->struct_v = 1;
305 msg_a->global_id = cpu_to_le64(ac->global_id);
306 msg_a->service_id = cpu_to_le32(th->service);
307 msg_a->ticket_blob.struct_v = 1;
308 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
309 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
310 if (ticket_blob_len) {
311 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
312 th->ticket_blob->vec.iov_len);
313 }
314 dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
315 le64_to_cpu(msg_a->ticket_blob.secret_id));
316
317 p = msg_a + 1;
318 p += ticket_blob_len;
319 end = au->buf->vec.iov_base + au->buf->vec.iov_len;
320
321 get_random_bytes(&au->nonce, sizeof(au->nonce));
322 msg_b.struct_v = 1;
323 msg_b.nonce = cpu_to_le64(au->nonce);
324 ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
325 p, end - p);
326 if (ret < 0)
327 goto out_buf;
328 p += ret;
329 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
330 dout(" built authorizer nonce %llx len %d\n", au->nonce,
331 (int)au->buf->vec.iov_len);
332 BUG_ON(au->buf->vec.iov_len > maxlen);
333 return 0;
334
335out_buf:
336 ceph_buffer_put(au->buf);
337 au->buf = NULL;
338 return ret;
339}
340
341static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
342 void **p, void *end)
343{
344 ceph_decode_need(p, end, 1 + sizeof(u64), bad);
345 ceph_encode_8(p, 1);
346 ceph_encode_64(p, th->secret_id);
347 if (th->ticket_blob) {
348 const char *buf = th->ticket_blob->vec.iov_base;
349 u32 len = th->ticket_blob->vec.iov_len;
350
351 ceph_encode_32_safe(p, end, len, bad);
352 ceph_encode_copy_safe(p, end, buf, len, bad);
353 } else {
354 ceph_encode_32_safe(p, end, 0, bad);
355 }
356
357 return 0;
358bad:
359 return -ERANGE;
360}
361
362static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
363{
364 int want = ac->want_keys;
365 struct ceph_x_info *xi = ac->private;
366 int service;
367
368 *pneed = ac->want_keys & ~(xi->have_keys);
369
370 for (service = 1; service <= want; service <<= 1) {
371 struct ceph_x_ticket_handler *th;
372
373 if (!(ac->want_keys & service))
374 continue;
375
376 if (*pneed & service)
377 continue;
378
379 th = get_ticket_handler(ac, service);
380
381 if (IS_ERR(th)) {
382 *pneed |= service;
383 continue;
384 }
385
386 if (get_seconds() >= th->renew_after)
387 *pneed |= service;
388 if (get_seconds() >= th->expires)
389 xi->have_keys &= ~service;
390 }
391}
392
393
394static int ceph_x_build_request(struct ceph_auth_client *ac,
395 void *buf, void *end)
396{
397 struct ceph_x_info *xi = ac->private;
398 int need;
399 struct ceph_x_request_header *head = buf;
400 int ret;
401 struct ceph_x_ticket_handler *th =
402 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
403
404 if (IS_ERR(th))
405 return PTR_ERR(th);
406
407 ceph_x_validate_tickets(ac, &need);
408
409 dout("build_request want %x have %x need %x\n",
410 ac->want_keys, xi->have_keys, need);
411
412 if (need & CEPH_ENTITY_TYPE_AUTH) {
413 struct ceph_x_authenticate *auth = (void *)(head + 1);
414 void *p = auth + 1;
415 struct ceph_x_challenge_blob tmp;
416 char tmp_enc[40];
417 u64 *u;
418
419 if (p > end)
420 return -ERANGE;
421
422 dout(" get_auth_session_key\n");
423 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
424
425
426 get_random_bytes(&auth->client_challenge, sizeof(u64));
427 tmp.client_challenge = auth->client_challenge;
428 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
429 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
430 tmp_enc, sizeof(tmp_enc));
431 if (ret < 0)
432 return ret;
433
434 auth->struct_v = 1;
435 auth->key = 0;
436 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
437 auth->key ^= *(__le64 *)u;
438 dout(" server_challenge %llx client_challenge %llx key %llx\n",
439 xi->server_challenge, le64_to_cpu(auth->client_challenge),
440 le64_to_cpu(auth->key));
441
442
443 ret = ceph_x_encode_ticket(th, &p, end);
444 if (ret < 0)
445 return ret;
446
447 return p - buf;
448 }
449
450 if (need) {
451 void *p = head + 1;
452 struct ceph_x_service_ticket_request *req;
453
454 if (p > end)
455 return -ERANGE;
456 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
457
458 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
459 if (ret)
460 return ret;
461 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
462 xi->auth_authorizer.buf->vec.iov_len);
463
464 req = p;
465 req->keys = cpu_to_le32(need);
466 p += sizeof(*req);
467 return p - buf;
468 }
469
470 return 0;
471}
472
473static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
474 void *buf, void *end)
475{
476 struct ceph_x_info *xi = ac->private;
477 struct ceph_x_reply_header *head = buf;
478 struct ceph_x_ticket_handler *th;
479 int len = end - buf;
480 int op;
481 int ret;
482
483 if (result)
484 return result;
485
486 if (xi->starting) {
487
488 struct ceph_x_server_challenge *sc = buf;
489
490 if (len != sizeof(*sc))
491 return -EINVAL;
492 xi->server_challenge = le64_to_cpu(sc->server_challenge);
493 dout("handle_reply got server challenge %llx\n",
494 xi->server_challenge);
495 xi->starting = false;
496 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
497 return -EAGAIN;
498 }
499
500 op = le16_to_cpu(head->op);
501 result = le32_to_cpu(head->result);
502 dout("handle_reply op %d result %d\n", op, result);
503 switch (op) {
504 case CEPHX_GET_AUTH_SESSION_KEY:
505
506 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
507 buf + sizeof(*head), end);
508 break;
509
510 case CEPHX_GET_PRINCIPAL_SESSION_KEY:
511 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
512 if (IS_ERR(th))
513 return PTR_ERR(th);
514 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
515 buf + sizeof(*head), end);
516 break;
517
518 default:
519 return -EINVAL;
520 }
521 if (ret)
522 return ret;
523 if (ac->want_keys == xi->have_keys)
524 return 0;
525 return -EAGAIN;
526}
527
528static int ceph_x_create_authorizer(
529 struct ceph_auth_client *ac, int peer_type,
530 struct ceph_auth_handshake *auth)
531{
532 struct ceph_x_authorizer *au;
533 struct ceph_x_ticket_handler *th;
534 int ret;
535
536 th = get_ticket_handler(ac, peer_type);
537 if (IS_ERR(th))
538 return PTR_ERR(th);
539
540 au = kzalloc(sizeof(*au), GFP_NOFS);
541 if (!au)
542 return -ENOMEM;
543
544 ret = ceph_x_build_authorizer(ac, th, au);
545 if (ret) {
546 kfree(au);
547 return ret;
548 }
549
550 auth->authorizer = (struct ceph_authorizer *) au;
551 auth->authorizer_buf = au->buf->vec.iov_base;
552 auth->authorizer_buf_len = au->buf->vec.iov_len;
553 auth->authorizer_reply_buf = au->reply_buf;
554 auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
555
556 return 0;
557}
558
559static int ceph_x_update_authorizer(
560 struct ceph_auth_client *ac, int peer_type,
561 struct ceph_auth_handshake *auth)
562{
563 struct ceph_x_authorizer *au;
564 struct ceph_x_ticket_handler *th;
565
566 th = get_ticket_handler(ac, peer_type);
567 if (IS_ERR(th))
568 return PTR_ERR(th);
569
570 au = (struct ceph_x_authorizer *)auth->authorizer;
571 if (au->secret_id < th->secret_id) {
572 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
573 au->service, au->secret_id, th->secret_id);
574 return ceph_x_build_authorizer(ac, th, au);
575 }
576 return 0;
577}
578
579static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
580 struct ceph_authorizer *a, size_t len)
581{
582 struct ceph_x_authorizer *au = (void *)a;
583 struct ceph_x_ticket_handler *th;
584 int ret = 0;
585 struct ceph_x_authorize_reply reply;
586 void *p = au->reply_buf;
587 void *end = p + sizeof(au->reply_buf);
588
589 th = get_ticket_handler(ac, au->service);
590 if (IS_ERR(th))
591 return PTR_ERR(th);
592 ret = ceph_x_decrypt(&th->session_key, &p, end, &reply, sizeof(reply));
593 if (ret < 0)
594 return ret;
595 if (ret != sizeof(reply))
596 return -EPERM;
597
598 if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
599 ret = -EPERM;
600 else
601 ret = 0;
602 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
603 au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
604 return ret;
605}
606
607static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
608 struct ceph_authorizer *a)
609{
610 struct ceph_x_authorizer *au = (void *)a;
611
612 ceph_buffer_put(au->buf);
613 kfree(au);
614}
615
616
617static void ceph_x_reset(struct ceph_auth_client *ac)
618{
619 struct ceph_x_info *xi = ac->private;
620
621 dout("reset\n");
622 xi->starting = true;
623 xi->server_challenge = 0;
624}
625
626static void ceph_x_destroy(struct ceph_auth_client *ac)
627{
628 struct ceph_x_info *xi = ac->private;
629 struct rb_node *p;
630
631 dout("ceph_x_destroy %p\n", ac);
632 ceph_crypto_key_destroy(&xi->secret);
633
634 while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
635 struct ceph_x_ticket_handler *th =
636 rb_entry(p, struct ceph_x_ticket_handler, node);
637 remove_ticket_handler(ac, th);
638 }
639
640 if (xi->auth_authorizer.buf)
641 ceph_buffer_put(xi->auth_authorizer.buf);
642
643 kfree(ac->private);
644 ac->private = NULL;
645}
646
647static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
648 int peer_type)
649{
650 struct ceph_x_ticket_handler *th;
651
652 th = get_ticket_handler(ac, peer_type);
653 if (!IS_ERR(th))
654 memset(&th->validity, 0, sizeof(th->validity));
655}
656
657
658static const struct ceph_auth_client_ops ceph_x_ops = {
659 .name = "x",
660 .is_authenticated = ceph_x_is_authenticated,
661 .should_authenticate = ceph_x_should_authenticate,
662 .build_request = ceph_x_build_request,
663 .handle_reply = ceph_x_handle_reply,
664 .create_authorizer = ceph_x_create_authorizer,
665 .update_authorizer = ceph_x_update_authorizer,
666 .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
667 .destroy_authorizer = ceph_x_destroy_authorizer,
668 .invalidate_authorizer = ceph_x_invalidate_authorizer,
669 .reset = ceph_x_reset,
670 .destroy = ceph_x_destroy,
671};
672
673
674int ceph_x_init(struct ceph_auth_client *ac)
675{
676 struct ceph_x_info *xi;
677 int ret;
678
679 dout("ceph_x_init %p\n", ac);
680 ret = -ENOMEM;
681 xi = kzalloc(sizeof(*xi), GFP_NOFS);
682 if (!xi)
683 goto out;
684
685 ret = -EINVAL;
686 if (!ac->key) {
687 pr_err("no secret set (for auth_x protocol)\n");
688 goto out_nomem;
689 }
690
691 ret = ceph_crypto_key_clone(&xi->secret, ac->key);
692 if (ret < 0) {
693 pr_err("cannot clone key: %d\n", ret);
694 goto out_nomem;
695 }
696
697 xi->starting = true;
698 xi->ticket_handlers = RB_ROOT;
699
700 ac->protocol = CEPH_AUTH_CEPHX;
701 ac->private = xi;
702 ac->ops = &ceph_x_ops;
703 return 0;
704
705out_nomem:
706 kfree(xi);
707out:
708 return ret;
709}
710
711
712
