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 | |
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 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 | |
36 | static 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 | |
47 | static int ceph_x_encrypt_offset(void) |
48 | { |
49 | return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); |
50 | } |
51 | |
52 | static int ceph_x_encrypt_buflen(int ilen) |
53 | { |
54 | return ceph_x_encrypt_offset() + ilen + 16; |
55 | } |
56 | |
57 | static 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 | |
77 | static 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 | |
97 | static 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 | |
112 | e_inval: |
113 | return -EINVAL; |
114 | } |
115 | |
116 | /* |
117 | * get existing (or insert new) ticket handler |
118 | */ |
119 | static struct ceph_x_ticket_handler * |
120 | get_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(size: 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 | |
147 | static 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 | |
160 | static 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 | |
263 | bad: |
264 | ret = -EINVAL; |
265 | out: |
266 | ceph_crypto_key_destroy(key: &new_session_key); |
267 | return ret; |
268 | } |
269 | |
270 | static 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 | |
293 | bad: |
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 | */ |
302 | static 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 | |
342 | static 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 | |
351 | static 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 | |
413 | out_au: |
414 | ceph_x_authorizer_cleanup(au); |
415 | return ret; |
416 | } |
417 | |
418 | static 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; |
435 | bad: |
436 | return -ERANGE; |
437 | } |
438 | |
439 | static 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 | |
447 | static 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 | |
458 | static 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 | |
488 | static 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 | |
568 | e_range: |
569 | return -ERANGE; |
570 | } |
571 | |
572 | static 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 | |
593 | bad_memzero: |
594 | memzero_explicit(s: *p, count: len); |
595 | bad: |
596 | pr_err("failed to decode connection secret\n" ); |
597 | return -EINVAL; |
598 | } |
599 | |
600 | static 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 | dout("%s connection secret blob len %d\n" , __func__, len); |
635 | if (len > 0) { |
636 | dp = *p + ceph_x_encrypt_offset(); |
637 | ret = ceph_x_decrypt(secret: &th->session_key, p, end: *p + len); |
638 | if (ret < 0) |
639 | return ret; |
640 | |
641 | dout("%s decrypted %d bytes\n" , __func__, ret); |
642 | dend = dp + ret; |
643 | |
644 | ret = decode_con_secret(p: &dp, end: dend, con_secret, con_secret_len); |
645 | if (ret) |
646 | return ret; |
647 | } |
648 | |
649 | /* service tickets */ |
650 | ceph_decode_32_safe(p, end, len, e_inval); |
651 | dout("%s service tickets blob len %d\n" , __func__, len); |
652 | if (len > 0) { |
653 | ret = ceph_x_proc_ticket_reply(ac, secret: &th->session_key, |
654 | p, end: *p + len); |
655 | if (ret) |
656 | return ret; |
657 | } |
658 | |
659 | return 0; |
660 | |
661 | e_inval: |
662 | return -EINVAL; |
663 | } |
664 | |
665 | static int ceph_x_handle_reply(struct ceph_auth_client *ac, u64 global_id, |
666 | void *buf, void *end, |
667 | u8 *session_key, int *session_key_len, |
668 | u8 *con_secret, int *con_secret_len) |
669 | { |
670 | struct ceph_x_info *xi = ac->private; |
671 | struct ceph_x_ticket_handler *th; |
672 | int len = end - buf; |
673 | int result; |
674 | void *p; |
675 | int op; |
676 | int ret; |
677 | |
678 | if (xi->starting) { |
679 | /* it's a hello */ |
680 | struct ceph_x_server_challenge *sc = buf; |
681 | |
682 | if (len != sizeof(*sc)) |
683 | return -EINVAL; |
684 | xi->server_challenge = le64_to_cpu(sc->server_challenge); |
685 | dout("handle_reply got server challenge %llx\n" , |
686 | xi->server_challenge); |
687 | xi->starting = false; |
688 | xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; |
689 | return -EAGAIN; |
690 | } |
691 | |
692 | p = buf; |
693 | ceph_decode_16_safe(&p, end, op, e_inval); |
694 | ceph_decode_32_safe(&p, end, result, e_inval); |
695 | dout("handle_reply op %d result %d\n" , op, result); |
696 | switch (op) { |
697 | case CEPHX_GET_AUTH_SESSION_KEY: |
698 | /* AUTH ticket + [connection secret] + service tickets */ |
699 | ret = handle_auth_session_key(ac, global_id, p: &p, end, |
700 | session_key, session_key_len, |
701 | con_secret, con_secret_len); |
702 | break; |
703 | |
704 | case CEPHX_GET_PRINCIPAL_SESSION_KEY: |
705 | th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); |
706 | if (IS_ERR(ptr: th)) |
707 | return PTR_ERR(ptr: th); |
708 | |
709 | /* service tickets */ |
710 | ret = ceph_x_proc_ticket_reply(ac, secret: &th->session_key, p: &p, end); |
711 | break; |
712 | |
713 | default: |
714 | return -EINVAL; |
715 | } |
716 | if (ret) |
717 | return ret; |
718 | if (ac->want_keys == xi->have_keys) |
719 | return 0; |
720 | return -EAGAIN; |
721 | |
722 | e_inval: |
723 | return -EINVAL; |
724 | } |
725 | |
726 | static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) |
727 | { |
728 | struct ceph_x_authorizer *au = (void *)a; |
729 | |
730 | ceph_x_authorizer_cleanup(au); |
731 | kfree(objp: au); |
732 | } |
733 | |
734 | static int ceph_x_create_authorizer( |
735 | struct ceph_auth_client *ac, int peer_type, |
736 | struct ceph_auth_handshake *auth) |
737 | { |
738 | struct ceph_x_authorizer *au; |
739 | struct ceph_x_ticket_handler *th; |
740 | int ret; |
741 | |
742 | th = get_ticket_handler(ac, service: peer_type); |
743 | if (IS_ERR(ptr: th)) |
744 | return PTR_ERR(ptr: th); |
745 | |
746 | au = kzalloc(size: sizeof(*au), GFP_NOFS); |
747 | if (!au) |
748 | return -ENOMEM; |
749 | |
750 | au->base.destroy = ceph_x_destroy_authorizer; |
751 | |
752 | ret = ceph_x_build_authorizer(ac, th, au); |
753 | if (ret) { |
754 | kfree(objp: au); |
755 | return ret; |
756 | } |
757 | |
758 | auth->authorizer = (struct ceph_authorizer *) au; |
759 | auth->authorizer_buf = au->buf->vec.iov_base; |
760 | auth->authorizer_buf_len = au->buf->vec.iov_len; |
761 | auth->authorizer_reply_buf = au->enc_buf; |
762 | auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; |
763 | auth->sign_message = ac->ops->sign_message; |
764 | auth->check_message_signature = ac->ops->check_message_signature; |
765 | |
766 | return 0; |
767 | } |
768 | |
769 | static int ceph_x_update_authorizer( |
770 | struct ceph_auth_client *ac, int peer_type, |
771 | struct ceph_auth_handshake *auth) |
772 | { |
773 | struct ceph_x_authorizer *au; |
774 | struct ceph_x_ticket_handler *th; |
775 | |
776 | th = get_ticket_handler(ac, service: peer_type); |
777 | if (IS_ERR(ptr: th)) |
778 | return PTR_ERR(ptr: th); |
779 | |
780 | au = (struct ceph_x_authorizer *)auth->authorizer; |
781 | if (au->secret_id < th->secret_id) { |
782 | dout("ceph_x_update_authorizer service %u secret %llu < %llu\n" , |
783 | au->service, au->secret_id, th->secret_id); |
784 | return ceph_x_build_authorizer(ac, th, au); |
785 | } |
786 | return 0; |
787 | } |
788 | |
789 | /* |
790 | * CephXAuthorizeChallenge |
791 | */ |
792 | static int decrypt_authorizer_challenge(struct ceph_crypto_key *secret, |
793 | void *challenge, int challenge_len, |
794 | u64 *server_challenge) |
795 | { |
796 | void *dp, *dend; |
797 | int ret; |
798 | |
799 | /* no leading len */ |
800 | ret = __ceph_x_decrypt(secret, p: challenge, ciphertext_len: challenge_len); |
801 | if (ret < 0) |
802 | return ret; |
803 | |
804 | dout("%s decrypted %d bytes\n" , __func__, ret); |
805 | dp = challenge + sizeof(struct ceph_x_encrypt_header); |
806 | dend = dp + ret; |
807 | |
808 | ceph_decode_skip_8(&dp, dend, e_inval); /* struct_v */ |
809 | ceph_decode_64_safe(&dp, dend, *server_challenge, e_inval); |
810 | dout("%s server_challenge %llu\n" , __func__, *server_challenge); |
811 | return 0; |
812 | |
813 | e_inval: |
814 | return -EINVAL; |
815 | } |
816 | |
817 | static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac, |
818 | struct ceph_authorizer *a, |
819 | void *challenge, int challenge_len) |
820 | { |
821 | struct ceph_x_authorizer *au = (void *)a; |
822 | u64 server_challenge; |
823 | int ret; |
824 | |
825 | ret = decrypt_authorizer_challenge(secret: &au->session_key, challenge, |
826 | challenge_len, server_challenge: &server_challenge); |
827 | if (ret) { |
828 | pr_err("failed to decrypt authorize challenge: %d" , ret); |
829 | return ret; |
830 | } |
831 | |
832 | ret = encrypt_authorizer(au, server_challenge: &server_challenge); |
833 | if (ret) { |
834 | pr_err("failed to encrypt authorizer w/ challenge: %d" , ret); |
835 | return ret; |
836 | } |
837 | |
838 | return 0; |
839 | } |
840 | |
841 | /* |
842 | * CephXAuthorizeReply |
843 | */ |
844 | static int decrypt_authorizer_reply(struct ceph_crypto_key *secret, |
845 | void **p, void *end, u64 *nonce_plus_one, |
846 | u8 *con_secret, int *con_secret_len) |
847 | { |
848 | void *dp, *dend; |
849 | u8 struct_v; |
850 | int ret; |
851 | |
852 | dp = *p + ceph_x_encrypt_offset(); |
853 | ret = ceph_x_decrypt(secret, p, end); |
854 | if (ret < 0) |
855 | return ret; |
856 | |
857 | dout("%s decrypted %d bytes\n" , __func__, ret); |
858 | dend = dp + ret; |
859 | |
860 | ceph_decode_8_safe(&dp, dend, struct_v, e_inval); |
861 | ceph_decode_64_safe(&dp, dend, *nonce_plus_one, e_inval); |
862 | dout("%s nonce_plus_one %llu\n" , __func__, *nonce_plus_one); |
863 | if (struct_v >= 2) { |
864 | ret = decode_con_secret(p: &dp, end: dend, con_secret, con_secret_len); |
865 | if (ret) |
866 | return ret; |
867 | } |
868 | |
869 | return 0; |
870 | |
871 | e_inval: |
872 | return -EINVAL; |
873 | } |
874 | |
875 | static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, |
876 | struct ceph_authorizer *a, |
877 | void *reply, int reply_len, |
878 | u8 *session_key, int *session_key_len, |
879 | u8 *con_secret, int *con_secret_len) |
880 | { |
881 | struct ceph_x_authorizer *au = (void *)a; |
882 | u64 nonce_plus_one; |
883 | int ret; |
884 | |
885 | if (session_key) { |
886 | memcpy(session_key, au->session_key.key, au->session_key.len); |
887 | *session_key_len = au->session_key.len; |
888 | } |
889 | |
890 | ret = decrypt_authorizer_reply(secret: &au->session_key, p: &reply, |
891 | end: reply + reply_len, nonce_plus_one: &nonce_plus_one, |
892 | con_secret, con_secret_len); |
893 | if (ret) |
894 | return ret; |
895 | |
896 | if (nonce_plus_one != au->nonce + 1) { |
897 | pr_err("failed to authenticate server\n" ); |
898 | return -EPERM; |
899 | } |
900 | |
901 | return 0; |
902 | } |
903 | |
904 | static void ceph_x_reset(struct ceph_auth_client *ac) |
905 | { |
906 | struct ceph_x_info *xi = ac->private; |
907 | |
908 | dout("reset\n" ); |
909 | xi->starting = true; |
910 | xi->server_challenge = 0; |
911 | } |
912 | |
913 | static void ceph_x_destroy(struct ceph_auth_client *ac) |
914 | { |
915 | struct ceph_x_info *xi = ac->private; |
916 | struct rb_node *p; |
917 | |
918 | dout("ceph_x_destroy %p\n" , ac); |
919 | ceph_crypto_key_destroy(key: &xi->secret); |
920 | |
921 | while ((p = rb_first(&xi->ticket_handlers)) != NULL) { |
922 | struct ceph_x_ticket_handler *th = |
923 | rb_entry(p, struct ceph_x_ticket_handler, node); |
924 | remove_ticket_handler(ac, th); |
925 | } |
926 | |
927 | ceph_x_authorizer_cleanup(au: &xi->auth_authorizer); |
928 | |
929 | kfree(objp: ac->private); |
930 | ac->private = NULL; |
931 | } |
932 | |
933 | static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) |
934 | { |
935 | struct ceph_x_ticket_handler *th; |
936 | |
937 | th = get_ticket_handler(ac, service: peer_type); |
938 | if (IS_ERR(ptr: th)) |
939 | return; |
940 | |
941 | if (th->have_key) { |
942 | dout("ticket %d (%s) secret_id %llu invalidated\n" , |
943 | th->service, ceph_entity_type_name(th->service), |
944 | th->secret_id); |
945 | th->have_key = false; |
946 | } |
947 | } |
948 | |
949 | static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, |
950 | int peer_type) |
951 | { |
952 | /* |
953 | * We are to invalidate a service ticket in the hopes of |
954 | * getting a new, hopefully more valid, one. But, we won't get |
955 | * it unless our AUTH ticket is good, so invalidate AUTH ticket |
956 | * as well, just in case. |
957 | */ |
958 | invalidate_ticket(ac, peer_type); |
959 | invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); |
960 | } |
961 | |
962 | static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, |
963 | __le64 *psig) |
964 | { |
965 | void *enc_buf = au->enc_buf; |
966 | int ret; |
967 | |
968 | if (!CEPH_HAVE_FEATURE(msg->con->peer_features, CEPHX_V2)) { |
969 | struct { |
970 | __le32 len; |
971 | __le32 ; |
972 | __le32 front_crc; |
973 | __le32 middle_crc; |
974 | __le32 data_crc; |
975 | } __packed *sigblock = enc_buf + ceph_x_encrypt_offset(); |
976 | |
977 | sigblock->len = cpu_to_le32(4*sizeof(u32)); |
978 | sigblock->header_crc = msg->hdr.crc; |
979 | sigblock->front_crc = msg->footer.front_crc; |
980 | sigblock->middle_crc = msg->footer.middle_crc; |
981 | sigblock->data_crc = msg->footer.data_crc; |
982 | |
983 | ret = ceph_x_encrypt(secret: &au->session_key, buf: enc_buf, |
984 | CEPHX_AU_ENC_BUF_LEN, plaintext_len: sizeof(*sigblock)); |
985 | if (ret < 0) |
986 | return ret; |
987 | |
988 | *psig = *(__le64 *)(enc_buf + sizeof(u32)); |
989 | } else { |
990 | struct { |
991 | __le32 ; |
992 | __le32 front_crc; |
993 | __le32 front_len; |
994 | __le32 middle_crc; |
995 | __le32 middle_len; |
996 | __le32 data_crc; |
997 | __le32 data_len; |
998 | __le32 seq_lower_word; |
999 | } __packed *sigblock = enc_buf; |
1000 | struct { |
1001 | __le64 a, b, c, d; |
1002 | } __packed *penc = enc_buf; |
1003 | int ciphertext_len; |
1004 | |
1005 | sigblock->header_crc = msg->hdr.crc; |
1006 | sigblock->front_crc = msg->footer.front_crc; |
1007 | sigblock->front_len = msg->hdr.front_len; |
1008 | sigblock->middle_crc = msg->footer.middle_crc; |
1009 | sigblock->middle_len = msg->hdr.middle_len; |
1010 | sigblock->data_crc = msg->footer.data_crc; |
1011 | sigblock->data_len = msg->hdr.data_len; |
1012 | sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq; |
1013 | |
1014 | /* no leading len, no ceph_x_encrypt_header */ |
1015 | ret = ceph_crypt(key: &au->session_key, encrypt: true, buf: enc_buf, |
1016 | CEPHX_AU_ENC_BUF_LEN, in_len: sizeof(*sigblock), |
1017 | pout_len: &ciphertext_len); |
1018 | if (ret) |
1019 | return ret; |
1020 | |
1021 | *psig = penc->a ^ penc->b ^ penc->c ^ penc->d; |
1022 | } |
1023 | |
1024 | return 0; |
1025 | } |
1026 | |
1027 | static int ceph_x_sign_message(struct ceph_auth_handshake *auth, |
1028 | struct ceph_msg *msg) |
1029 | { |
1030 | __le64 sig; |
1031 | int ret; |
1032 | |
1033 | if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) |
1034 | return 0; |
1035 | |
1036 | ret = calc_signature(au: (struct ceph_x_authorizer *)auth->authorizer, |
1037 | msg, psig: &sig); |
1038 | if (ret) |
1039 | return ret; |
1040 | |
1041 | msg->footer.sig = sig; |
1042 | msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; |
1043 | return 0; |
1044 | } |
1045 | |
1046 | static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, |
1047 | struct ceph_msg *msg) |
1048 | { |
1049 | __le64 sig_check; |
1050 | int ret; |
1051 | |
1052 | if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) |
1053 | return 0; |
1054 | |
1055 | ret = calc_signature(au: (struct ceph_x_authorizer *)auth->authorizer, |
1056 | msg, psig: &sig_check); |
1057 | if (ret) |
1058 | return ret; |
1059 | if (sig_check == msg->footer.sig) |
1060 | return 0; |
1061 | if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) |
1062 | dout("ceph_x_check_message_signature %p has signature %llx " |
1063 | "expect %llx\n" , msg, msg->footer.sig, sig_check); |
1064 | else |
1065 | dout("ceph_x_check_message_signature %p sender did not set " |
1066 | "CEPH_MSG_FOOTER_SIGNED\n" , msg); |
1067 | return -EBADMSG; |
1068 | } |
1069 | |
1070 | static const struct ceph_auth_client_ops ceph_x_ops = { |
1071 | .is_authenticated = ceph_x_is_authenticated, |
1072 | .should_authenticate = ceph_x_should_authenticate, |
1073 | .build_request = ceph_x_build_request, |
1074 | .handle_reply = ceph_x_handle_reply, |
1075 | .create_authorizer = ceph_x_create_authorizer, |
1076 | .update_authorizer = ceph_x_update_authorizer, |
1077 | .add_authorizer_challenge = ceph_x_add_authorizer_challenge, |
1078 | .verify_authorizer_reply = ceph_x_verify_authorizer_reply, |
1079 | .invalidate_authorizer = ceph_x_invalidate_authorizer, |
1080 | .reset = ceph_x_reset, |
1081 | .destroy = ceph_x_destroy, |
1082 | .sign_message = ceph_x_sign_message, |
1083 | .check_message_signature = ceph_x_check_message_signature, |
1084 | }; |
1085 | |
1086 | |
1087 | int ceph_x_init(struct ceph_auth_client *ac) |
1088 | { |
1089 | struct ceph_x_info *xi; |
1090 | int ret; |
1091 | |
1092 | dout("ceph_x_init %p\n" , ac); |
1093 | ret = -ENOMEM; |
1094 | xi = kzalloc(size: sizeof(*xi), GFP_NOFS); |
1095 | if (!xi) |
1096 | goto out; |
1097 | |
1098 | ret = -EINVAL; |
1099 | if (!ac->key) { |
1100 | pr_err("no secret set (for auth_x protocol)\n" ); |
1101 | goto out_nomem; |
1102 | } |
1103 | |
1104 | ret = ceph_crypto_key_clone(dst: &xi->secret, src: ac->key); |
1105 | if (ret < 0) { |
1106 | pr_err("cannot clone key: %d\n" , ret); |
1107 | goto out_nomem; |
1108 | } |
1109 | |
1110 | xi->starting = true; |
1111 | xi->ticket_handlers = RB_ROOT; |
1112 | |
1113 | ac->protocol = CEPH_AUTH_CEPHX; |
1114 | ac->private = xi; |
1115 | ac->ops = &ceph_x_ops; |
1116 | return 0; |
1117 | |
1118 | out_nomem: |
1119 | kfree(objp: xi); |
1120 | out: |
1121 | return ret; |
1122 | } |
1123 | |