1// SPDX-License-Identifier: GPL-2.0
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
20static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
21
22static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
23{
24 struct ceph_x_info *xi = ac->private;
25 int missing;
26 int need; /* missing + need renewal */
27
28 ceph_x_validate_tickets(ac, pneed: &need);
29 missing = ac->want_keys & ~xi->have_keys;
30 WARN_ON((need & missing) != missing);
31 dout("%s want 0x%x have 0x%x missing 0x%x -> %d\n", __func__,
32 ac->want_keys, xi->have_keys, missing, !missing);
33 return !missing;
34}
35
36static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
37{
38 struct ceph_x_info *xi = ac->private;
39 int need;
40
41 ceph_x_validate_tickets(ac, pneed: &need);
42 dout("%s want 0x%x have 0x%x need 0x%x -> %d\n", __func__,
43 ac->want_keys, xi->have_keys, need, !!need);
44 return !!need;
45}
46
47static int ceph_x_encrypt_offset(void)
48{
49 return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
50}
51
52static int ceph_x_encrypt_buflen(int ilen)
53{
54 return ceph_x_encrypt_offset() + ilen + 16;
55}
56
57static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
58 int buf_len, int plaintext_len)
59{
60 struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
61 int ciphertext_len;
62 int ret;
63
64 hdr->struct_v = 1;
65 hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
66
67 ret = ceph_crypt(key: secret, encrypt: true, buf: buf + sizeof(u32), buf_len: buf_len - sizeof(u32),
68 in_len: plaintext_len + sizeof(struct ceph_x_encrypt_header),
69 pout_len: &ciphertext_len);
70 if (ret)
71 return ret;
72
73 ceph_encode_32(p: &buf, v: ciphertext_len);
74 return sizeof(u32) + ciphertext_len;
75}
76
77static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p,
78 int ciphertext_len)
79{
80 struct ceph_x_encrypt_header *hdr = p;
81 int plaintext_len;
82 int ret;
83
84 ret = ceph_crypt(key: secret, encrypt: false, buf: p, buf_len: ciphertext_len, in_len: ciphertext_len,
85 pout_len: &plaintext_len);
86 if (ret)
87 return ret;
88
89 if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) {
90 pr_err("%s bad magic\n", __func__);
91 return -EINVAL;
92 }
93
94 return plaintext_len - sizeof(*hdr);
95}
96
97static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
98{
99 int ciphertext_len;
100 int ret;
101
102 ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
103 ceph_decode_need(p, end, ciphertext_len, e_inval);
104
105 ret = __ceph_x_decrypt(secret, p: *p, ciphertext_len);
106 if (ret < 0)
107 return ret;
108
109 *p += ciphertext_len;
110 return ret;
111
112e_inval:
113 return -EINVAL;
114}
115
116/*
117 * get existing (or insert new) ticket handler
118 */
119static struct ceph_x_ticket_handler *
120get_ticket_handler(struct ceph_auth_client *ac, int service)
121{
122 struct ceph_x_ticket_handler *th;
123 struct ceph_x_info *xi = ac->private;
124 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
125
126 while (*p) {
127 parent = *p;
128 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
129 if (service < th->service)
130 p = &(*p)->rb_left;
131 else if (service > th->service)
132 p = &(*p)->rb_right;
133 else
134 return th;
135 }
136
137 /* add it */
138 th = kzalloc(sizeof(*th), GFP_NOFS);
139 if (!th)
140 return ERR_PTR(error: -ENOMEM);
141 th->service = service;
142 rb_link_node(node: &th->node, parent, rb_link: p);
143 rb_insert_color(&th->node, &xi->ticket_handlers);
144 return th;
145}
146
147static void remove_ticket_handler(struct ceph_auth_client *ac,
148 struct ceph_x_ticket_handler *th)
149{
150 struct ceph_x_info *xi = ac->private;
151
152 dout("remove_ticket_handler %p %d\n", th, th->service);
153 rb_erase(&th->node, &xi->ticket_handlers);
154 ceph_crypto_key_destroy(key: &th->session_key);
155 if (th->ticket_blob)
156 ceph_buffer_put(b: th->ticket_blob);
157 kfree(objp: th);
158}
159
160static int process_one_ticket(struct ceph_auth_client *ac,
161 struct ceph_crypto_key *secret,
162 void **p, void *end)
163{
164 struct ceph_x_info *xi = ac->private;
165 int type;
166 u8 tkt_struct_v, blob_struct_v;
167 struct ceph_x_ticket_handler *th;
168 void *dp, *dend;
169 int dlen;
170 char is_enc;
171 struct timespec64 validity;
172 void *tp, *tpend;
173 void **ptp;
174 struct ceph_crypto_key new_session_key = { 0 };
175 struct ceph_buffer *new_ticket_blob;
176 time64_t new_expires, new_renew_after;
177 u64 new_secret_id;
178 int ret;
179
180 ceph_decode_need(p, end, sizeof(u32) + 1, bad);
181
182 type = ceph_decode_32(p);
183 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
184
185 tkt_struct_v = ceph_decode_8(p);
186 if (tkt_struct_v != 1)
187 goto bad;
188
189 th = get_ticket_handler(ac, service: type);
190 if (IS_ERR(ptr: th)) {
191 ret = PTR_ERR(ptr: th);
192 goto out;
193 }
194
195 /* blob for me */
196 dp = *p + ceph_x_encrypt_offset();
197 ret = ceph_x_decrypt(secret, p, end);
198 if (ret < 0)
199 goto out;
200 dout(" decrypted %d bytes\n", ret);
201 dend = dp + ret;
202
203 ceph_decode_8_safe(&dp, dend, tkt_struct_v, bad);
204 if (tkt_struct_v != 1)
205 goto bad;
206
207 ret = ceph_crypto_key_decode(key: &new_session_key, p: &dp, end: dend);
208 if (ret)
209 goto out;
210
211 ceph_decode_need(&dp, dend, sizeof(struct ceph_timespec), bad);
212 ceph_decode_timespec64(ts: &validity, tv: dp);
213 dp += sizeof(struct ceph_timespec);
214 new_expires = ktime_get_real_seconds() + validity.tv_sec;
215 new_renew_after = new_expires - (validity.tv_sec / 4);
216 dout(" expires=%llu renew_after=%llu\n", new_expires,
217 new_renew_after);
218
219 /* ticket blob for service */
220 ceph_decode_8_safe(p, end, is_enc, bad);
221 if (is_enc) {
222 /* encrypted */
223 tp = *p + ceph_x_encrypt_offset();
224 ret = ceph_x_decrypt(secret: &th->session_key, p, end);
225 if (ret < 0)
226 goto out;
227 dout(" encrypted ticket, decrypted %d bytes\n", ret);
228 ptp = &tp;
229 tpend = tp + ret;
230 } else {
231 /* unencrypted */
232 ptp = p;
233 tpend = end;
234 }
235 ceph_decode_32_safe(ptp, tpend, dlen, bad);
236 dout(" ticket blob is %d bytes\n", dlen);
237 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
238 blob_struct_v = ceph_decode_8(p: ptp);
239 if (blob_struct_v != 1)
240 goto bad;
241
242 new_secret_id = ceph_decode_64(p: ptp);
243 ret = ceph_decode_buffer(b: &new_ticket_blob, p: ptp, end: tpend);
244 if (ret)
245 goto out;
246
247 /* all is well, update our ticket */
248 ceph_crypto_key_destroy(key: &th->session_key);
249 if (th->ticket_blob)
250 ceph_buffer_put(b: th->ticket_blob);
251 th->session_key = new_session_key;
252 th->ticket_blob = new_ticket_blob;
253 th->secret_id = new_secret_id;
254 th->expires = new_expires;
255 th->renew_after = new_renew_after;
256 th->have_key = true;
257 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
258 type, ceph_entity_type_name(type), th->secret_id,
259 (int)th->ticket_blob->vec.iov_len);
260 xi->have_keys |= th->service;
261 return 0;
262
263bad:
264 ret = -EINVAL;
265out:
266 ceph_crypto_key_destroy(key: &new_session_key);
267 return ret;
268}
269
270static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
271 struct ceph_crypto_key *secret,
272 void **p, void *end)
273{
274 u8 reply_struct_v;
275 u32 num;
276 int ret;
277
278 ceph_decode_8_safe(p, end, reply_struct_v, bad);
279 if (reply_struct_v != 1)
280 return -EINVAL;
281
282 ceph_decode_32_safe(p, end, num, bad);
283 dout("%d tickets\n", num);
284
285 while (num--) {
286 ret = process_one_ticket(ac, secret, p, end);
287 if (ret)
288 return ret;
289 }
290
291 return 0;
292
293bad:
294 return -EINVAL;
295}
296
297/*
298 * Encode and encrypt the second part (ceph_x_authorize_b) of the
299 * authorizer. The first part (ceph_x_authorize_a) should already be
300 * encoded.
301 */
302static int encrypt_authorizer(struct ceph_x_authorizer *au,
303 u64 *server_challenge)
304{
305 struct ceph_x_authorize_a *msg_a;
306 struct ceph_x_authorize_b *msg_b;
307 void *p, *end;
308 int ret;
309
310 msg_a = au->buf->vec.iov_base;
311 WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id));
312 p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len);
313 end = au->buf->vec.iov_base + au->buf->vec.iov_len;
314
315 msg_b = p + ceph_x_encrypt_offset();
316 msg_b->struct_v = 2;
317 msg_b->nonce = cpu_to_le64(au->nonce);
318 if (server_challenge) {
319 msg_b->have_challenge = 1;
320 msg_b->server_challenge_plus_one =
321 cpu_to_le64(*server_challenge + 1);
322 } else {
323 msg_b->have_challenge = 0;
324 msg_b->server_challenge_plus_one = 0;
325 }
326
327 ret = ceph_x_encrypt(secret: &au->session_key, buf: p, buf_len: end - p, plaintext_len: sizeof(*msg_b));
328 if (ret < 0)
329 return ret;
330
331 p += ret;
332 if (server_challenge) {
333 WARN_ON(p != end);
334 } else {
335 WARN_ON(p > end);
336 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
337 }
338
339 return 0;
340}
341
342static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
343{
344 ceph_crypto_key_destroy(key: &au->session_key);
345 if (au->buf) {
346 ceph_buffer_put(b: au->buf);
347 au->buf = NULL;
348 }
349}
350
351static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
352 struct ceph_x_ticket_handler *th,
353 struct ceph_x_authorizer *au)
354{
355 int maxlen;
356 struct ceph_x_authorize_a *msg_a;
357 struct ceph_x_authorize_b *msg_b;
358 int ret;
359 int ticket_blob_len =
360 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
361
362 dout("build_authorizer for %s %p\n",
363 ceph_entity_type_name(th->service), au);
364
365 ceph_crypto_key_destroy(key: &au->session_key);
366 ret = ceph_crypto_key_clone(dst: &au->session_key, src: &th->session_key);
367 if (ret)
368 goto out_au;
369
370 maxlen = sizeof(*msg_a) + ticket_blob_len +
371 ceph_x_encrypt_buflen(ilen: sizeof(*msg_b));
372 dout(" need len %d\n", maxlen);
373 if (au->buf && au->buf->alloc_len < maxlen) {
374 ceph_buffer_put(b: au->buf);
375 au->buf = NULL;
376 }
377 if (!au->buf) {
378 au->buf = ceph_buffer_new(len: maxlen, GFP_NOFS);
379 if (!au->buf) {
380 ret = -ENOMEM;
381 goto out_au;
382 }
383 }
384 au->service = th->service;
385 WARN_ON(!th->secret_id);
386 au->secret_id = th->secret_id;
387
388 msg_a = au->buf->vec.iov_base;
389 msg_a->struct_v = 1;
390 msg_a->global_id = cpu_to_le64(ac->global_id);
391 msg_a->service_id = cpu_to_le32(th->service);
392 msg_a->ticket_blob.struct_v = 1;
393 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
394 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
395 if (ticket_blob_len) {
396 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
397 th->ticket_blob->vec.iov_len);
398 }
399 dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
400 le64_to_cpu(msg_a->ticket_blob.secret_id));
401
402 get_random_bytes(buf: &au->nonce, len: sizeof(au->nonce));
403 ret = encrypt_authorizer(au, NULL);
404 if (ret) {
405 pr_err("failed to encrypt authorizer: %d", ret);
406 goto out_au;
407 }
408
409 dout(" built authorizer nonce %llx len %d\n", au->nonce,
410 (int)au->buf->vec.iov_len);
411 return 0;
412
413out_au:
414 ceph_x_authorizer_cleanup(au);
415 return ret;
416}
417
418static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
419 void **p, void *end)
420{
421 ceph_decode_need(p, end, 1 + sizeof(u64), bad);
422 ceph_encode_8(p, v: 1);
423 ceph_encode_64(p, v: th->secret_id);
424 if (th->ticket_blob) {
425 const char *buf = th->ticket_blob->vec.iov_base;
426 u32 len = th->ticket_blob->vec.iov_len;
427
428 ceph_encode_32_safe(p, end, len, bad);
429 ceph_encode_copy_safe(p, end, buf, len, bad);
430 } else {
431 ceph_encode_32_safe(p, end, 0, bad);
432 }
433
434 return 0;
435bad:
436 return -ERANGE;
437}
438
439static bool need_key(struct ceph_x_ticket_handler *th)
440{
441 if (!th->have_key)
442 return true;
443
444 return ktime_get_real_seconds() >= th->renew_after;
445}
446
447static bool have_key(struct ceph_x_ticket_handler *th)
448{
449 if (th->have_key && ktime_get_real_seconds() >= th->expires) {
450 dout("ticket %d (%s) secret_id %llu expired\n", th->service,
451 ceph_entity_type_name(th->service), th->secret_id);
452 th->have_key = false;
453 }
454
455 return th->have_key;
456}
457
458static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
459{
460 int want = ac->want_keys;
461 struct ceph_x_info *xi = ac->private;
462 int service;
463
464 *pneed = ac->want_keys & ~(xi->have_keys);
465
466 for (service = 1; service <= want; service <<= 1) {
467 struct ceph_x_ticket_handler *th;
468
469 if (!(ac->want_keys & service))
470 continue;
471
472 if (*pneed & service)
473 continue;
474
475 th = get_ticket_handler(ac, service);
476 if (IS_ERR(ptr: th)) {
477 *pneed |= service;
478 continue;
479 }
480
481 if (need_key(th))
482 *pneed |= service;
483 if (!have_key(th))
484 xi->have_keys &= ~service;
485 }
486}
487
488static int ceph_x_build_request(struct ceph_auth_client *ac,
489 void *buf, void *end)
490{
491 struct ceph_x_info *xi = ac->private;
492 int need;
493 struct ceph_x_request_header *head = buf;
494 void *p;
495 int ret;
496 struct ceph_x_ticket_handler *th =
497 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
498
499 if (IS_ERR(ptr: th))
500 return PTR_ERR(ptr: th);
501
502 ceph_x_validate_tickets(ac, pneed: &need);
503 dout("%s want 0x%x have 0x%x need 0x%x\n", __func__, ac->want_keys,
504 xi->have_keys, need);
505
506 if (need & CEPH_ENTITY_TYPE_AUTH) {
507 struct ceph_x_authenticate *auth = (void *)(head + 1);
508 void *enc_buf = xi->auth_authorizer.enc_buf;
509 struct ceph_x_challenge_blob *blob = enc_buf +
510 ceph_x_encrypt_offset();
511 u64 *u;
512
513 p = auth + 1;
514 if (p > end)
515 return -ERANGE;
516
517 dout(" get_auth_session_key\n");
518 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
519
520 /* encrypt and hash */
521 get_random_bytes(buf: &auth->client_challenge, len: sizeof(u64));
522 blob->client_challenge = auth->client_challenge;
523 blob->server_challenge = cpu_to_le64(xi->server_challenge);
524 ret = ceph_x_encrypt(secret: &xi->secret, buf: enc_buf, CEPHX_AU_ENC_BUF_LEN,
525 plaintext_len: sizeof(*blob));
526 if (ret < 0)
527 return ret;
528
529 auth->struct_v = 3; /* nautilus+ */
530 auth->key = 0;
531 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
532 auth->key ^= *(__le64 *)u;
533 dout(" server_challenge %llx client_challenge %llx key %llx\n",
534 xi->server_challenge, le64_to_cpu(auth->client_challenge),
535 le64_to_cpu(auth->key));
536
537 /* now encode the old ticket if exists */
538 ret = ceph_x_encode_ticket(th, p: &p, end);
539 if (ret < 0)
540 return ret;
541
542 /* nautilus+: request service tickets at the same time */
543 need = ac->want_keys & ~CEPH_ENTITY_TYPE_AUTH;
544 WARN_ON(!need);
545 ceph_encode_32_safe(&p, end, need, e_range);
546 return p - buf;
547 }
548
549 if (need) {
550 dout(" get_principal_session_key\n");
551 ret = ceph_x_build_authorizer(ac, th, au: &xi->auth_authorizer);
552 if (ret)
553 return ret;
554
555 p = buf;
556 ceph_encode_16_safe(&p, end, CEPHX_GET_PRINCIPAL_SESSION_KEY,
557 e_range);
558 ceph_encode_copy_safe(&p, end,
559 xi->auth_authorizer.buf->vec.iov_base,
560 xi->auth_authorizer.buf->vec.iov_len, e_range);
561 ceph_encode_8_safe(&p, end, 1, e_range);
562 ceph_encode_32_safe(&p, end, need, e_range);
563 return p - buf;
564 }
565
566 return 0;
567
568e_range:
569 return -ERANGE;
570}
571
572static int decode_con_secret(void **p, void *end, u8 *con_secret,
573 int *con_secret_len)
574{
575 int len;
576
577 ceph_decode_32_safe(p, end, len, bad);
578 ceph_decode_need(p, end, len, bad);
579
580 dout("%s len %d\n", __func__, len);
581 if (con_secret) {
582 if (len > CEPH_MAX_CON_SECRET_LEN) {
583 pr_err("connection secret too big %d\n", len);
584 goto bad_memzero;
585 }
586 memcpy(con_secret, *p, len);
587 *con_secret_len = len;
588 }
589 memzero_explicit(s: *p, count: len);
590 *p += len;
591 return 0;
592
593bad_memzero:
594 memzero_explicit(s: *p, count: len);
595bad:
596 pr_err("failed to decode connection secret\n");
597 return -EINVAL;
598}
599
600static int handle_auth_session_key(struct ceph_auth_client *ac, u64 global_id,
601 void **p, void *end,
602 u8 *session_key, int *session_key_len,
603 u8 *con_secret, int *con_secret_len)
604{
605 struct ceph_x_info *xi = ac->private;
606 struct ceph_x_ticket_handler *th;
607 void *dp, *dend;
608 int len;
609 int ret;
610
611 /* AUTH ticket */
612 ret = ceph_x_proc_ticket_reply(ac, secret: &xi->secret, p, end);
613 if (ret)
614 return ret;
615
616 ceph_auth_set_global_id(ac, global_id);
617 if (*p == end) {
618 /* pre-nautilus (or didn't request service tickets!) */
619 WARN_ON(session_key || con_secret);
620 return 0;
621 }
622
623 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
624 if (IS_ERR(ptr: th))
625 return PTR_ERR(ptr: th);
626
627 if (session_key) {
628 memcpy(session_key, th->session_key.key, th->session_key.len);
629 *session_key_len = th->session_key.len;
630 }
631
632 /* connection secret */
633 ceph_decode_32_safe(p, end, len, e_inval);
634 ceph_decode_need(p, end, len, e_inval);
635 dout("%s connection secret blob len %d\n", __func__, len);
636 if (len > 0) {
637 dp = *p + ceph_x_encrypt_offset();
638 ret = ceph_x_decrypt(secret: &th->session_key, p, end: *p + len);
639 if (ret < 0)
640 return ret;
641
642 dout("%s decrypted %d bytes\n", __func__, ret);
643 dend = dp + ret;
644
645 ret = decode_con_secret(p: &dp, end: dend, con_secret, con_secret_len);
646 if (ret)
647 return ret;
648 }
649
650 /* service tickets */
651 ceph_decode_32_safe(p, end, len, e_inval);
652 ceph_decode_need(p, end, len, e_inval);
653 dout("%s service tickets blob len %d\n", __func__, len);
654 if (len > 0) {
655 ret = ceph_x_proc_ticket_reply(ac, secret: &th->session_key,
656 p, end: *p + len);
657 if (ret)
658 return ret;
659 }
660
661 return 0;
662
663e_inval:
664 return -EINVAL;
665}
666
667static int ceph_x_handle_reply(struct ceph_auth_client *ac, u64 global_id,
668 void *buf, void *end,
669 u8 *session_key, int *session_key_len,
670 u8 *con_secret, int *con_secret_len)
671{
672 struct ceph_x_info *xi = ac->private;
673 struct ceph_x_ticket_handler *th;
674 int len = end - buf;
675 int result;
676 void *p;
677 int op;
678 int ret;
679
680 if (xi->starting) {
681 /* it's a hello */
682 struct ceph_x_server_challenge *sc = buf;
683
684 if (len != sizeof(*sc))
685 return -EINVAL;
686 xi->server_challenge = le64_to_cpu(sc->server_challenge);
687 dout("handle_reply got server challenge %llx\n",
688 xi->server_challenge);
689 xi->starting = false;
690 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
691 return -EAGAIN;
692 }
693
694 p = buf;
695 ceph_decode_16_safe(&p, end, op, e_inval);
696 ceph_decode_32_safe(&p, end, result, e_inval);
697 dout("handle_reply op %d result %d\n", op, result);
698 switch (op) {
699 case CEPHX_GET_AUTH_SESSION_KEY:
700 /* AUTH ticket + [connection secret] + service tickets */
701 ret = handle_auth_session_key(ac, global_id, p: &p, end,
702 session_key, session_key_len,
703 con_secret, con_secret_len);
704 break;
705
706 case CEPHX_GET_PRINCIPAL_SESSION_KEY:
707 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
708 if (IS_ERR(ptr: th))
709 return PTR_ERR(ptr: th);
710
711 /* service tickets */
712 ret = ceph_x_proc_ticket_reply(ac, secret: &th->session_key, p: &p, end);
713 break;
714
715 default:
716 return -EINVAL;
717 }
718 if (ret)
719 return ret;
720 if (ac->want_keys == xi->have_keys)
721 return 0;
722 return -EAGAIN;
723
724e_inval:
725 return -EINVAL;
726}
727
728static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
729{
730 struct ceph_x_authorizer *au = (void *)a;
731
732 ceph_x_authorizer_cleanup(au);
733 kfree(objp: au);
734}
735
736static int ceph_x_create_authorizer(
737 struct ceph_auth_client *ac, int peer_type,
738 struct ceph_auth_handshake *auth)
739{
740 struct ceph_x_authorizer *au;
741 struct ceph_x_ticket_handler *th;
742 int ret;
743
744 th = get_ticket_handler(ac, service: peer_type);
745 if (IS_ERR(ptr: th))
746 return PTR_ERR(ptr: th);
747
748 au = kzalloc(sizeof(*au), GFP_NOFS);
749 if (!au)
750 return -ENOMEM;
751
752 au->base.destroy = ceph_x_destroy_authorizer;
753
754 ret = ceph_x_build_authorizer(ac, th, au);
755 if (ret) {
756 kfree(objp: au);
757 return ret;
758 }
759
760 auth->authorizer = (struct ceph_authorizer *) au;
761 auth->authorizer_buf = au->buf->vec.iov_base;
762 auth->authorizer_buf_len = au->buf->vec.iov_len;
763 auth->authorizer_reply_buf = au->enc_buf;
764 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
765 auth->sign_message = ac->ops->sign_message;
766 auth->check_message_signature = ac->ops->check_message_signature;
767
768 return 0;
769}
770
771static int ceph_x_update_authorizer(
772 struct ceph_auth_client *ac, int peer_type,
773 struct ceph_auth_handshake *auth)
774{
775 struct ceph_x_authorizer *au;
776 struct ceph_x_ticket_handler *th;
777
778 th = get_ticket_handler(ac, service: peer_type);
779 if (IS_ERR(ptr: th))
780 return PTR_ERR(ptr: th);
781
782 au = (struct ceph_x_authorizer *)auth->authorizer;
783 if (au->secret_id < th->secret_id) {
784 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
785 au->service, au->secret_id, th->secret_id);
786 return ceph_x_build_authorizer(ac, th, au);
787 }
788 return 0;
789}
790
791/*
792 * CephXAuthorizeChallenge
793 */
794static int decrypt_authorizer_challenge(struct ceph_crypto_key *secret,
795 void *challenge, int challenge_len,
796 u64 *server_challenge)
797{
798 void *dp, *dend;
799 int ret;
800
801 /* no leading len */
802 ret = __ceph_x_decrypt(secret, p: challenge, ciphertext_len: challenge_len);
803 if (ret < 0)
804 return ret;
805
806 dout("%s decrypted %d bytes\n", __func__, ret);
807 dp = challenge + sizeof(struct ceph_x_encrypt_header);
808 dend = dp + ret;
809
810 ceph_decode_skip_8(&dp, dend, e_inval); /* struct_v */
811 ceph_decode_64_safe(&dp, dend, *server_challenge, e_inval);
812 dout("%s server_challenge %llu\n", __func__, *server_challenge);
813 return 0;
814
815e_inval:
816 return -EINVAL;
817}
818
819static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac,
820 struct ceph_authorizer *a,
821 void *challenge, int challenge_len)
822{
823 struct ceph_x_authorizer *au = (void *)a;
824 u64 server_challenge;
825 int ret;
826
827 ret = decrypt_authorizer_challenge(secret: &au->session_key, challenge,
828 challenge_len, server_challenge: &server_challenge);
829 if (ret) {
830 pr_err("failed to decrypt authorize challenge: %d", ret);
831 return ret;
832 }
833
834 ret = encrypt_authorizer(au, server_challenge: &server_challenge);
835 if (ret) {
836 pr_err("failed to encrypt authorizer w/ challenge: %d", ret);
837 return ret;
838 }
839
840 return 0;
841}
842
843/*
844 * CephXAuthorizeReply
845 */
846static int decrypt_authorizer_reply(struct ceph_crypto_key *secret,
847 void **p, void *end, u64 *nonce_plus_one,
848 u8 *con_secret, int *con_secret_len)
849{
850 void *dp, *dend;
851 u8 struct_v;
852 int ret;
853
854 dp = *p + ceph_x_encrypt_offset();
855 ret = ceph_x_decrypt(secret, p, end);
856 if (ret < 0)
857 return ret;
858
859 dout("%s decrypted %d bytes\n", __func__, ret);
860 dend = dp + ret;
861
862 ceph_decode_8_safe(&dp, dend, struct_v, e_inval);
863 ceph_decode_64_safe(&dp, dend, *nonce_plus_one, e_inval);
864 dout("%s nonce_plus_one %llu\n", __func__, *nonce_plus_one);
865 if (struct_v >= 2) {
866 ret = decode_con_secret(p: &dp, end: dend, con_secret, con_secret_len);
867 if (ret)
868 return ret;
869 }
870
871 return 0;
872
873e_inval:
874 return -EINVAL;
875}
876
877static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
878 struct ceph_authorizer *a,
879 void *reply, int reply_len,
880 u8 *session_key, int *session_key_len,
881 u8 *con_secret, int *con_secret_len)
882{
883 struct ceph_x_authorizer *au = (void *)a;
884 u64 nonce_plus_one;
885 int ret;
886
887 if (session_key) {
888 memcpy(session_key, au->session_key.key, au->session_key.len);
889 *session_key_len = au->session_key.len;
890 }
891
892 ret = decrypt_authorizer_reply(secret: &au->session_key, p: &reply,
893 end: reply + reply_len, nonce_plus_one: &nonce_plus_one,
894 con_secret, con_secret_len);
895 if (ret)
896 return ret;
897
898 if (nonce_plus_one != au->nonce + 1) {
899 pr_err("failed to authenticate server\n");
900 return -EPERM;
901 }
902
903 return 0;
904}
905
906static void ceph_x_reset(struct ceph_auth_client *ac)
907{
908 struct ceph_x_info *xi = ac->private;
909
910 dout("reset\n");
911 xi->starting = true;
912 xi->server_challenge = 0;
913}
914
915static void ceph_x_destroy(struct ceph_auth_client *ac)
916{
917 struct ceph_x_info *xi = ac->private;
918 struct rb_node *p;
919
920 dout("ceph_x_destroy %p\n", ac);
921 ceph_crypto_key_destroy(key: &xi->secret);
922
923 while ((p = rb_first(root: &xi->ticket_handlers)) != NULL) {
924 struct ceph_x_ticket_handler *th =
925 rb_entry(p, struct ceph_x_ticket_handler, node);
926 remove_ticket_handler(ac, th);
927 }
928
929 ceph_x_authorizer_cleanup(au: &xi->auth_authorizer);
930
931 kfree(objp: ac->private);
932 ac->private = NULL;
933}
934
935static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
936{
937 struct ceph_x_ticket_handler *th;
938
939 th = get_ticket_handler(ac, service: peer_type);
940 if (IS_ERR(ptr: th))
941 return;
942
943 if (th->have_key) {
944 dout("ticket %d (%s) secret_id %llu invalidated\n",
945 th->service, ceph_entity_type_name(th->service),
946 th->secret_id);
947 th->have_key = false;
948 }
949}
950
951static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
952 int peer_type)
953{
954 /*
955 * We are to invalidate a service ticket in the hopes of
956 * getting a new, hopefully more valid, one. But, we won't get
957 * it unless our AUTH ticket is good, so invalidate AUTH ticket
958 * as well, just in case.
959 */
960 invalidate_ticket(ac, peer_type);
961 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
962}
963
964static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
965 __le64 *psig)
966{
967 void *enc_buf = au->enc_buf;
968 int ret;
969
970 if (!CEPH_HAVE_FEATURE(msg->con->peer_features, CEPHX_V2)) {
971 struct {
972 __le32 len;
973 __le32 header_crc;
974 __le32 front_crc;
975 __le32 middle_crc;
976 __le32 data_crc;
977 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
978
979 sigblock->len = cpu_to_le32(4*sizeof(u32));
980 sigblock->header_crc = msg->hdr.crc;
981 sigblock->front_crc = msg->footer.front_crc;
982 sigblock->middle_crc = msg->footer.middle_crc;
983 sigblock->data_crc = msg->footer.data_crc;
984
985 ret = ceph_x_encrypt(secret: &au->session_key, buf: enc_buf,
986 CEPHX_AU_ENC_BUF_LEN, plaintext_len: sizeof(*sigblock));
987 if (ret < 0)
988 return ret;
989
990 *psig = *(__le64 *)(enc_buf + sizeof(u32));
991 } else {
992 struct {
993 __le32 header_crc;
994 __le32 front_crc;
995 __le32 front_len;
996 __le32 middle_crc;
997 __le32 middle_len;
998 __le32 data_crc;
999 __le32 data_len;
1000 __le32 seq_lower_word;
1001 } __packed *sigblock = enc_buf;
1002 struct {
1003 __le64 a, b, c, d;
1004 } __packed *penc = enc_buf;
1005 int ciphertext_len;
1006
1007 sigblock->header_crc = msg->hdr.crc;
1008 sigblock->front_crc = msg->footer.front_crc;
1009 sigblock->front_len = msg->hdr.front_len;
1010 sigblock->middle_crc = msg->footer.middle_crc;
1011 sigblock->middle_len = msg->hdr.middle_len;
1012 sigblock->data_crc = msg->footer.data_crc;
1013 sigblock->data_len = msg->hdr.data_len;
1014 sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq;
1015
1016 /* no leading len, no ceph_x_encrypt_header */
1017 ret = ceph_crypt(key: &au->session_key, encrypt: true, buf: enc_buf,
1018 CEPHX_AU_ENC_BUF_LEN, in_len: sizeof(*sigblock),
1019 pout_len: &ciphertext_len);
1020 if (ret)
1021 return ret;
1022
1023 *psig = penc->a ^ penc->b ^ penc->c ^ penc->d;
1024 }
1025
1026 return 0;
1027}
1028
1029static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
1030 struct ceph_msg *msg)
1031{
1032 __le64 sig;
1033 int ret;
1034
1035 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
1036 return 0;
1037
1038 ret = calc_signature(au: (struct ceph_x_authorizer *)auth->authorizer,
1039 msg, psig: &sig);
1040 if (ret)
1041 return ret;
1042
1043 msg->footer.sig = sig;
1044 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
1045 return 0;
1046}
1047
1048static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
1049 struct ceph_msg *msg)
1050{
1051 __le64 sig_check;
1052 int ret;
1053
1054 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
1055 return 0;
1056
1057 ret = calc_signature(au: (struct ceph_x_authorizer *)auth->authorizer,
1058 msg, psig: &sig_check);
1059 if (ret)
1060 return ret;
1061 if (sig_check == msg->footer.sig)
1062 return 0;
1063 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
1064 dout("ceph_x_check_message_signature %p has signature %llx "
1065 "expect %llx\n", msg, msg->footer.sig, sig_check);
1066 else
1067 dout("ceph_x_check_message_signature %p sender did not set "
1068 "CEPH_MSG_FOOTER_SIGNED\n", msg);
1069 return -EBADMSG;
1070}
1071
1072static const struct ceph_auth_client_ops ceph_x_ops = {
1073 .is_authenticated = ceph_x_is_authenticated,
1074 .should_authenticate = ceph_x_should_authenticate,
1075 .build_request = ceph_x_build_request,
1076 .handle_reply = ceph_x_handle_reply,
1077 .create_authorizer = ceph_x_create_authorizer,
1078 .update_authorizer = ceph_x_update_authorizer,
1079 .add_authorizer_challenge = ceph_x_add_authorizer_challenge,
1080 .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
1081 .invalidate_authorizer = ceph_x_invalidate_authorizer,
1082 .reset = ceph_x_reset,
1083 .destroy = ceph_x_destroy,
1084 .sign_message = ceph_x_sign_message,
1085 .check_message_signature = ceph_x_check_message_signature,
1086};
1087
1088
1089int ceph_x_init(struct ceph_auth_client *ac)
1090{
1091 struct ceph_x_info *xi;
1092 int ret;
1093
1094 dout("ceph_x_init %p\n", ac);
1095 ret = -ENOMEM;
1096 xi = kzalloc(sizeof(*xi), GFP_NOFS);
1097 if (!xi)
1098 goto out;
1099
1100 ret = -EINVAL;
1101 if (!ac->key) {
1102 pr_err("no secret set (for auth_x protocol)\n");
1103 goto out_nomem;
1104 }
1105
1106 ret = ceph_crypto_key_clone(dst: &xi->secret, src: ac->key);
1107 if (ret < 0) {
1108 pr_err("cannot clone key: %d\n", ret);
1109 goto out_nomem;
1110 }
1111
1112 xi->starting = true;
1113 xi->ticket_handlers = RB_ROOT;
1114
1115 ac->protocol = CEPH_AUTH_CEPHX;
1116 ac->private = xi;
1117 ac->ops = &ceph_x_ops;
1118 return 0;
1119
1120out_nomem:
1121 kfree(objp: xi);
1122out:
1123 return ret;
1124}
1125

source code of linux/net/ceph/auth_x.c