1
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/module.h>
5#include <linux/err.h>
6#include <linux/slab.h>
7
8#include <linux/ceph/types.h>
9#include <linux/ceph/decode.h>
10#include <linux/ceph/libceph.h>
11#include <linux/ceph/messenger.h>
12#include "auth_none.h"
13#include "auth_x.h"
14
15
16
17
18
19static u32 supported_protocols[] = {
20 CEPH_AUTH_NONE,
21 CEPH_AUTH_CEPHX
22};
23
24static int init_protocol(struct ceph_auth_client *ac, int proto)
25{
26 dout("%s proto %d\n", __func__, proto);
27
28 switch (proto) {
29 case CEPH_AUTH_NONE:
30 return ceph_auth_none_init(ac);
31 case CEPH_AUTH_CEPHX:
32 return ceph_x_init(ac);
33 default:
34 pr_err("bad auth protocol %d\n", proto);
35 return -EINVAL;
36 }
37}
38
39void ceph_auth_set_global_id(struct ceph_auth_client *ac, u64 global_id)
40{
41 dout("%s global_id %llu\n", __func__, global_id);
42
43 if (!global_id)
44 pr_err("got zero global_id\n");
45
46 if (ac->global_id && global_id != ac->global_id)
47 pr_err("global_id changed from %llu to %llu\n", ac->global_id,
48 global_id);
49
50 ac->global_id = global_id;
51}
52
53
54
55
56struct ceph_auth_client *ceph_auth_init(const char *name,
57 const struct ceph_crypto_key *key,
58 const int *con_modes)
59{
60 struct ceph_auth_client *ac;
61
62 ac = kzalloc(sizeof(*ac), GFP_NOFS);
63 if (!ac)
64 return ERR_PTR(-ENOMEM);
65
66 mutex_init(&ac->mutex);
67 ac->negotiating = true;
68 if (name)
69 ac->name = name;
70 else
71 ac->name = CEPH_AUTH_NAME_DEFAULT;
72 ac->key = key;
73 ac->preferred_mode = con_modes[0];
74 ac->fallback_mode = con_modes[1];
75
76 dout("%s name '%s' preferred_mode %d fallback_mode %d\n", __func__,
77 ac->name, ac->preferred_mode, ac->fallback_mode);
78 return ac;
79}
80
81void ceph_auth_destroy(struct ceph_auth_client *ac)
82{
83 dout("auth_destroy %p\n", ac);
84 if (ac->ops)
85 ac->ops->destroy(ac);
86 kfree(ac);
87}
88
89
90
91
92void ceph_auth_reset(struct ceph_auth_client *ac)
93{
94 mutex_lock(&ac->mutex);
95 dout("auth_reset %p\n", ac);
96 if (ac->ops && !ac->negotiating)
97 ac->ops->reset(ac);
98 ac->negotiating = true;
99 mutex_unlock(&ac->mutex);
100}
101
102
103
104
105int ceph_auth_entity_name_encode(const char *name, void **p, void *end)
106{
107 int len = strlen(name);
108
109 if (*p + 2*sizeof(u32) + len > end)
110 return -ERANGE;
111 ceph_encode_32(p, CEPH_ENTITY_TYPE_CLIENT);
112 ceph_encode_32(p, len);
113 ceph_encode_copy(p, name, len);
114 return 0;
115}
116
117
118
119
120
121int ceph_auth_build_hello(struct ceph_auth_client *ac, void *buf, size_t len)
122{
123 struct ceph_mon_request_header *monhdr = buf;
124 void *p = monhdr + 1, *end = buf + len, *lenp;
125 int i, num;
126 int ret;
127
128 mutex_lock(&ac->mutex);
129 dout("auth_build_hello\n");
130 monhdr->have_version = 0;
131 monhdr->session_mon = cpu_to_le16(-1);
132 monhdr->session_mon_tid = 0;
133
134 ceph_encode_32(&p, CEPH_AUTH_UNKNOWN);
135
136 lenp = p;
137 p += sizeof(u32);
138
139 ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
140 ceph_encode_8(&p, 1);
141 num = ARRAY_SIZE(supported_protocols);
142 ceph_encode_32(&p, num);
143 ceph_decode_need(&p, end, num * sizeof(u32), bad);
144 for (i = 0; i < num; i++)
145 ceph_encode_32(&p, supported_protocols[i]);
146
147 ret = ceph_auth_entity_name_encode(ac->name, &p, end);
148 if (ret < 0)
149 goto out;
150 ceph_decode_need(&p, end, sizeof(u64), bad);
151 ceph_encode_64(&p, ac->global_id);
152
153 ceph_encode_32(&lenp, p - lenp - sizeof(u32));
154 ret = p - buf;
155out:
156 mutex_unlock(&ac->mutex);
157 return ret;
158
159bad:
160 ret = -ERANGE;
161 goto out;
162}
163
164static int build_request(struct ceph_auth_client *ac, bool add_header,
165 void *buf, int buf_len)
166{
167 void *end = buf + buf_len;
168 void *p;
169 int ret;
170
171 p = buf;
172 if (add_header) {
173
174 ceph_encode_64_safe(&p, end, 0, e_range);
175 ceph_encode_16_safe(&p, end, -1, e_range);
176 ceph_encode_64_safe(&p, end, 0, e_range);
177 ceph_encode_32_safe(&p, end, ac->protocol, e_range);
178 }
179
180 ceph_encode_need(&p, end, sizeof(u32), e_range);
181 ret = ac->ops->build_request(ac, p + sizeof(u32), end);
182 if (ret < 0) {
183 pr_err("auth protocol '%s' building request failed: %d\n",
184 ceph_auth_proto_name(ac->protocol), ret);
185 return ret;
186 }
187 dout(" built request %d bytes\n", ret);
188 ceph_encode_32(&p, ret);
189 return p + ret - buf;
190
191e_range:
192 return -ERANGE;
193}
194
195
196
197
198int ceph_handle_auth_reply(struct ceph_auth_client *ac,
199 void *buf, size_t len,
200 void *reply_buf, size_t reply_len)
201{
202 void *p = buf;
203 void *end = buf + len;
204 int protocol;
205 s32 result;
206 u64 global_id;
207 void *payload, *payload_end;
208 int payload_len;
209 char *result_msg;
210 int result_msg_len;
211 int ret = -EINVAL;
212
213 mutex_lock(&ac->mutex);
214 dout("handle_auth_reply %p %p\n", p, end);
215 ceph_decode_need(&p, end, sizeof(u32) * 3 + sizeof(u64), bad);
216 protocol = ceph_decode_32(&p);
217 result = ceph_decode_32(&p);
218 global_id = ceph_decode_64(&p);
219 payload_len = ceph_decode_32(&p);
220 payload = p;
221 p += payload_len;
222 ceph_decode_need(&p, end, sizeof(u32), bad);
223 result_msg_len = ceph_decode_32(&p);
224 result_msg = p;
225 p += result_msg_len;
226 if (p != end)
227 goto bad;
228
229 dout(" result %d '%.*s' gid %llu len %d\n", result, result_msg_len,
230 result_msg, global_id, payload_len);
231
232 payload_end = payload + payload_len;
233
234 if (ac->negotiating) {
235
236 if (!protocol && result < 0) {
237 ret = result;
238 goto out;
239 }
240
241 if (ac->protocol && ac->protocol != protocol) {
242 ac->ops->destroy(ac);
243 ac->protocol = 0;
244 ac->ops = NULL;
245 }
246 if (ac->protocol != protocol) {
247 ret = init_protocol(ac, protocol);
248 if (ret) {
249 pr_err("auth protocol '%s' init failed: %d\n",
250 ceph_auth_proto_name(protocol), ret);
251 goto out;
252 }
253 }
254
255 ac->negotiating = false;
256 }
257
258 if (result) {
259 pr_err("auth protocol '%s' mauth authentication failed: %d\n",
260 ceph_auth_proto_name(ac->protocol), result);
261 ret = result;
262 goto out;
263 }
264
265 ret = ac->ops->handle_reply(ac, global_id, payload, payload_end,
266 NULL, NULL, NULL, NULL);
267 if (ret == -EAGAIN) {
268 ret = build_request(ac, true, reply_buf, reply_len);
269 goto out;
270 } else if (ret) {
271 goto out;
272 }
273
274out:
275 mutex_unlock(&ac->mutex);
276 return ret;
277
278bad:
279 pr_err("failed to decode auth msg\n");
280 ret = -EINVAL;
281 goto out;
282}
283
284int ceph_build_auth(struct ceph_auth_client *ac,
285 void *msg_buf, size_t msg_len)
286{
287 int ret = 0;
288
289 mutex_lock(&ac->mutex);
290 if (ac->ops->should_authenticate(ac))
291 ret = build_request(ac, true, msg_buf, msg_len);
292 mutex_unlock(&ac->mutex);
293 return ret;
294}
295
296int ceph_auth_is_authenticated(struct ceph_auth_client *ac)
297{
298 int ret = 0;
299
300 mutex_lock(&ac->mutex);
301 if (ac->ops)
302 ret = ac->ops->is_authenticated(ac);
303 mutex_unlock(&ac->mutex);
304 return ret;
305}
306EXPORT_SYMBOL(ceph_auth_is_authenticated);
307
308int __ceph_auth_get_authorizer(struct ceph_auth_client *ac,
309 struct ceph_auth_handshake *auth,
310 int peer_type, bool force_new,
311 int *proto, int *pref_mode, int *fallb_mode)
312{
313 int ret;
314
315 mutex_lock(&ac->mutex);
316 if (force_new && auth->authorizer) {
317 ceph_auth_destroy_authorizer(auth->authorizer);
318 auth->authorizer = NULL;
319 }
320 if (!auth->authorizer)
321 ret = ac->ops->create_authorizer(ac, peer_type, auth);
322 else if (ac->ops->update_authorizer)
323 ret = ac->ops->update_authorizer(ac, peer_type, auth);
324 else
325 ret = 0;
326 if (ret)
327 goto out;
328
329 *proto = ac->protocol;
330 if (pref_mode && fallb_mode) {
331 *pref_mode = ac->preferred_mode;
332 *fallb_mode = ac->fallback_mode;
333 }
334
335out:
336 mutex_unlock(&ac->mutex);
337 return ret;
338}
339EXPORT_SYMBOL(__ceph_auth_get_authorizer);
340
341void ceph_auth_destroy_authorizer(struct ceph_authorizer *a)
342{
343 a->destroy(a);
344}
345EXPORT_SYMBOL(ceph_auth_destroy_authorizer);
346
347int ceph_auth_add_authorizer_challenge(struct ceph_auth_client *ac,
348 struct ceph_authorizer *a,
349 void *challenge_buf,
350 int challenge_buf_len)
351{
352 int ret = 0;
353
354 mutex_lock(&ac->mutex);
355 if (ac->ops && ac->ops->add_authorizer_challenge)
356 ret = ac->ops->add_authorizer_challenge(ac, a, challenge_buf,
357 challenge_buf_len);
358 mutex_unlock(&ac->mutex);
359 return ret;
360}
361EXPORT_SYMBOL(ceph_auth_add_authorizer_challenge);
362
363int ceph_auth_verify_authorizer_reply(struct ceph_auth_client *ac,
364 struct ceph_authorizer *a,
365 void *reply, int reply_len,
366 u8 *session_key, int *session_key_len,
367 u8 *con_secret, int *con_secret_len)
368{
369 int ret = 0;
370
371 mutex_lock(&ac->mutex);
372 if (ac->ops && ac->ops->verify_authorizer_reply)
373 ret = ac->ops->verify_authorizer_reply(ac, a,
374 reply, reply_len, session_key, session_key_len,
375 con_secret, con_secret_len);
376 mutex_unlock(&ac->mutex);
377 return ret;
378}
379EXPORT_SYMBOL(ceph_auth_verify_authorizer_reply);
380
381void ceph_auth_invalidate_authorizer(struct ceph_auth_client *ac, int peer_type)
382{
383 mutex_lock(&ac->mutex);
384 if (ac->ops && ac->ops->invalidate_authorizer)
385 ac->ops->invalidate_authorizer(ac, peer_type);
386 mutex_unlock(&ac->mutex);
387}
388EXPORT_SYMBOL(ceph_auth_invalidate_authorizer);
389
390
391
392
393
394static bool contains(const int *arr, int cnt, int val)
395{
396 int i;
397
398 for (i = 0; i < cnt; i++) {
399 if (arr[i] == val)
400 return true;
401 }
402
403 return false;
404}
405
406static int encode_con_modes(void **p, void *end, int pref_mode, int fallb_mode)
407{
408 WARN_ON(pref_mode == CEPH_CON_MODE_UNKNOWN);
409 if (fallb_mode != CEPH_CON_MODE_UNKNOWN) {
410 ceph_encode_32_safe(p, end, 2, e_range);
411 ceph_encode_32_safe(p, end, pref_mode, e_range);
412 ceph_encode_32_safe(p, end, fallb_mode, e_range);
413 } else {
414 ceph_encode_32_safe(p, end, 1, e_range);
415 ceph_encode_32_safe(p, end, pref_mode, e_range);
416 }
417
418 return 0;
419
420e_range:
421 return -ERANGE;
422}
423
424
425
426
427int ceph_auth_get_request(struct ceph_auth_client *ac, void *buf, int buf_len)
428{
429 int proto = ac->key ? CEPH_AUTH_CEPHX : CEPH_AUTH_NONE;
430 void *end = buf + buf_len;
431 void *lenp;
432 void *p;
433 int ret;
434
435 mutex_lock(&ac->mutex);
436 if (ac->protocol == CEPH_AUTH_UNKNOWN) {
437 ret = init_protocol(ac, proto);
438 if (ret) {
439 pr_err("auth protocol '%s' init failed: %d\n",
440 ceph_auth_proto_name(proto), ret);
441 goto out;
442 }
443 } else {
444 WARN_ON(ac->protocol != proto);
445 ac->ops->reset(ac);
446 }
447
448 p = buf;
449 ceph_encode_32_safe(&p, end, ac->protocol, e_range);
450 ret = encode_con_modes(&p, end, ac->preferred_mode, ac->fallback_mode);
451 if (ret)
452 goto out;
453
454 lenp = p;
455 p += 4;
456
457 ceph_encode_8_safe(&p, end, CEPH_AUTH_MODE_MON, e_range);
458 ret = ceph_auth_entity_name_encode(ac->name, &p, end);
459 if (ret)
460 goto out;
461
462 ceph_encode_64_safe(&p, end, ac->global_id, e_range);
463 ceph_encode_32(&lenp, p - lenp - 4);
464 ret = p - buf;
465
466out:
467 mutex_unlock(&ac->mutex);
468 return ret;
469
470e_range:
471 ret = -ERANGE;
472 goto out;
473}
474
475int ceph_auth_handle_reply_more(struct ceph_auth_client *ac, void *reply,
476 int reply_len, void *buf, int buf_len)
477{
478 int ret;
479
480 mutex_lock(&ac->mutex);
481 ret = ac->ops->handle_reply(ac, 0, reply, reply + reply_len,
482 NULL, NULL, NULL, NULL);
483 if (ret == -EAGAIN)
484 ret = build_request(ac, false, buf, buf_len);
485 else
486 WARN_ON(ret >= 0);
487 mutex_unlock(&ac->mutex);
488 return ret;
489}
490
491int ceph_auth_handle_reply_done(struct ceph_auth_client *ac,
492 u64 global_id, void *reply, int reply_len,
493 u8 *session_key, int *session_key_len,
494 u8 *con_secret, int *con_secret_len)
495{
496 int ret;
497
498 mutex_lock(&ac->mutex);
499 ret = ac->ops->handle_reply(ac, global_id, reply, reply + reply_len,
500 session_key, session_key_len,
501 con_secret, con_secret_len);
502 WARN_ON(ret == -EAGAIN || ret > 0);
503 mutex_unlock(&ac->mutex);
504 return ret;
505}
506
507bool ceph_auth_handle_bad_method(struct ceph_auth_client *ac,
508 int used_proto, int result,
509 const int *allowed_protos, int proto_cnt,
510 const int *allowed_modes, int mode_cnt)
511{
512 mutex_lock(&ac->mutex);
513 WARN_ON(used_proto != ac->protocol);
514
515 if (result == -EOPNOTSUPP) {
516 if (!contains(allowed_protos, proto_cnt, ac->protocol)) {
517 pr_err("auth protocol '%s' not allowed\n",
518 ceph_auth_proto_name(ac->protocol));
519 goto not_allowed;
520 }
521 if (!contains(allowed_modes, mode_cnt, ac->preferred_mode) &&
522 (ac->fallback_mode == CEPH_CON_MODE_UNKNOWN ||
523 !contains(allowed_modes, mode_cnt, ac->fallback_mode))) {
524 pr_err("preferred mode '%s' not allowed\n",
525 ceph_con_mode_name(ac->preferred_mode));
526 if (ac->fallback_mode == CEPH_CON_MODE_UNKNOWN)
527 pr_err("no fallback mode\n");
528 else
529 pr_err("fallback mode '%s' not allowed\n",
530 ceph_con_mode_name(ac->fallback_mode));
531 goto not_allowed;
532 }
533 }
534
535 WARN_ON(result == -EOPNOTSUPP || result >= 0);
536 pr_err("auth protocol '%s' msgr authentication failed: %d\n",
537 ceph_auth_proto_name(ac->protocol), result);
538
539 mutex_unlock(&ac->mutex);
540 return true;
541
542not_allowed:
543 mutex_unlock(&ac->mutex);
544 return false;
545}
546
547int ceph_auth_get_authorizer(struct ceph_auth_client *ac,
548 struct ceph_auth_handshake *auth,
549 int peer_type, void *buf, int *buf_len)
550{
551 void *end = buf + *buf_len;
552 int pref_mode, fallb_mode;
553 int proto;
554 void *p;
555 int ret;
556
557 ret = __ceph_auth_get_authorizer(ac, auth, peer_type, true, &proto,
558 &pref_mode, &fallb_mode);
559 if (ret)
560 return ret;
561
562 p = buf;
563 ceph_encode_32_safe(&p, end, proto, e_range);
564 ret = encode_con_modes(&p, end, pref_mode, fallb_mode);
565 if (ret)
566 return ret;
567
568 ceph_encode_32_safe(&p, end, auth->authorizer_buf_len, e_range);
569 *buf_len = p - buf;
570 return 0;
571
572e_range:
573 return -ERANGE;
574}
575EXPORT_SYMBOL(ceph_auth_get_authorizer);
576
577int ceph_auth_handle_svc_reply_more(struct ceph_auth_client *ac,
578 struct ceph_auth_handshake *auth,
579 void *reply, int reply_len,
580 void *buf, int *buf_len)
581{
582 void *end = buf + *buf_len;
583 void *p;
584 int ret;
585
586 ret = ceph_auth_add_authorizer_challenge(ac, auth->authorizer,
587 reply, reply_len);
588 if (ret)
589 return ret;
590
591 p = buf;
592 ceph_encode_32_safe(&p, end, auth->authorizer_buf_len, e_range);
593 *buf_len = p - buf;
594 return 0;
595
596e_range:
597 return -ERANGE;
598}
599EXPORT_SYMBOL(ceph_auth_handle_svc_reply_more);
600
601int ceph_auth_handle_svc_reply_done(struct ceph_auth_client *ac,
602 struct ceph_auth_handshake *auth,
603 void *reply, int reply_len,
604 u8 *session_key, int *session_key_len,
605 u8 *con_secret, int *con_secret_len)
606{
607 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
608 reply, reply_len, session_key, session_key_len,
609 con_secret, con_secret_len);
610}
611EXPORT_SYMBOL(ceph_auth_handle_svc_reply_done);
612
613bool ceph_auth_handle_bad_authorizer(struct ceph_auth_client *ac,
614 int peer_type, int used_proto, int result,
615 const int *allowed_protos, int proto_cnt,
616 const int *allowed_modes, int mode_cnt)
617{
618 mutex_lock(&ac->mutex);
619 WARN_ON(used_proto != ac->protocol);
620
621 if (result == -EOPNOTSUPP) {
622 if (!contains(allowed_protos, proto_cnt, ac->protocol)) {
623 pr_err("auth protocol '%s' not allowed by %s\n",
624 ceph_auth_proto_name(ac->protocol),
625 ceph_entity_type_name(peer_type));
626 goto not_allowed;
627 }
628 if (!contains(allowed_modes, mode_cnt, ac->preferred_mode) &&
629 (ac->fallback_mode == CEPH_CON_MODE_UNKNOWN ||
630 !contains(allowed_modes, mode_cnt, ac->fallback_mode))) {
631 pr_err("preferred mode '%s' not allowed by %s\n",
632 ceph_con_mode_name(ac->preferred_mode),
633 ceph_entity_type_name(peer_type));
634 if (ac->fallback_mode == CEPH_CON_MODE_UNKNOWN)
635 pr_err("no fallback mode\n");
636 else
637 pr_err("fallback mode '%s' not allowed by %s\n",
638 ceph_con_mode_name(ac->fallback_mode),
639 ceph_entity_type_name(peer_type));
640 goto not_allowed;
641 }
642 }
643
644 WARN_ON(result == -EOPNOTSUPP || result >= 0);
645 pr_err("auth protocol '%s' authorization to %s failed: %d\n",
646 ceph_auth_proto_name(ac->protocol),
647 ceph_entity_type_name(peer_type), result);
648
649 if (ac->ops->invalidate_authorizer)
650 ac->ops->invalidate_authorizer(ac, peer_type);
651
652 mutex_unlock(&ac->mutex);
653 return true;
654
655not_allowed:
656 mutex_unlock(&ac->mutex);
657 return false;
658}
659EXPORT_SYMBOL(ceph_auth_handle_bad_authorizer);
660
