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Commit | Line | Data |
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ec0994e4 | 1 | |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
ec0994e4 SW |
3 | |
4 | #include <linux/err.h> | |
5 | #include <linux/module.h> | |
6 | #include <linux/random.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
ec0994e4 | 8 | |
3d14c5d2 YS |
9 | #include <linux/ceph/decode.h> |
10 | #include <linux/ceph/auth.h> | |
a51983e4 | 11 | #include <linux/ceph/libceph.h> |
33d07337 | 12 | #include <linux/ceph/messenger.h> |
3d14c5d2 YS |
13 | |
14 | #include "crypto.h" | |
ec0994e4 SW |
15 | #include "auth_x.h" |
16 | #include "auth_x_protocol.h" | |
ec0994e4 | 17 | |
ec0994e4 SW |
18 | static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed); |
19 | ||
20 | static 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 | ||
a41359fa SW |
31 | static 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 | ||
55d9cc83 ID |
42 | static int ceph_x_encrypt_offset(void) |
43 | { | |
44 | return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); | |
45 | } | |
46 | ||
807c86e2 SW |
47 | static int ceph_x_encrypt_buflen(int ilen) |
48 | { | |
55d9cc83 | 49 | return ceph_x_encrypt_offset() + ilen + 16; |
807c86e2 SW |
50 | } |
51 | ||
ec0994e4 SW |
52 | static int ceph_x_encrypt(struct ceph_crypto_key *secret, |
53 | void *ibuf, int ilen, void *obuf, size_t olen) | |
54 | { | |
55 | struct ceph_x_encrypt_header head = { | |
56 | .struct_v = 1, | |
57 | .magic = cpu_to_le64(CEPHX_ENC_MAGIC) | |
58 | }; | |
59 | size_t len = olen - sizeof(u32); | |
60 | int ret; | |
61 | ||
62 | ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len, | |
63 | &head, sizeof(head), ibuf, ilen); | |
64 | if (ret) | |
65 | return ret; | |
66 | ceph_encode_32(&obuf, len); | |
67 | return len + sizeof(u32); | |
68 | } | |
69 | ||
70 | static int ceph_x_decrypt(struct ceph_crypto_key *secret, | |
c27a3e4d | 71 | void **p, void *end, void **obuf, size_t olen) |
ec0994e4 SW |
72 | { |
73 | struct ceph_x_encrypt_header head; | |
74 | size_t head_len = sizeof(head); | |
75 | int len, ret; | |
76 | ||
77 | len = ceph_decode_32(p); | |
78 | if (*p + len > end) | |
79 | return -EINVAL; | |
80 | ||
81 | dout("ceph_x_decrypt len %d\n", len); | |
c27a3e4d ID |
82 | if (*obuf == NULL) { |
83 | *obuf = kmalloc(len, GFP_NOFS); | |
84 | if (!*obuf) | |
85 | return -ENOMEM; | |
86 | olen = len; | |
87 | } | |
88 | ||
89 | ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len); | |
ec0994e4 SW |
90 | if (ret) |
91 | return ret; | |
92 | if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC) | |
93 | return -EPERM; | |
94 | *p += len; | |
95 | return olen; | |
96 | } | |
97 | ||
98 | /* | |
99 | * get existing (or insert new) ticket handler | |
100 | */ | |
cd84db6e YS |
101 | static struct ceph_x_ticket_handler * |
102 | get_ticket_handler(struct ceph_auth_client *ac, int service) | |
ec0994e4 SW |
103 | { |
104 | struct ceph_x_ticket_handler *th; | |
105 | struct ceph_x_info *xi = ac->private; | |
106 | struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; | |
107 | ||
108 | while (*p) { | |
109 | parent = *p; | |
110 | th = rb_entry(parent, struct ceph_x_ticket_handler, node); | |
111 | if (service < th->service) | |
112 | p = &(*p)->rb_left; | |
113 | else if (service > th->service) | |
114 | p = &(*p)->rb_right; | |
115 | else | |
116 | return th; | |
117 | } | |
118 | ||
119 | /* add it */ | |
120 | th = kzalloc(sizeof(*th), GFP_NOFS); | |
121 | if (!th) | |
122 | return ERR_PTR(-ENOMEM); | |
123 | th->service = service; | |
124 | rb_link_node(&th->node, parent, p); | |
125 | rb_insert_color(&th->node, &xi->ticket_handlers); | |
126 | return th; | |
127 | } | |
128 | ||
129 | static void remove_ticket_handler(struct ceph_auth_client *ac, | |
130 | struct ceph_x_ticket_handler *th) | |
131 | { | |
132 | struct ceph_x_info *xi = ac->private; | |
133 | ||
134 | dout("remove_ticket_handler %p %d\n", th, th->service); | |
135 | rb_erase(&th->node, &xi->ticket_handlers); | |
136 | ceph_crypto_key_destroy(&th->session_key); | |
137 | if (th->ticket_blob) | |
138 | ceph_buffer_put(th->ticket_blob); | |
139 | kfree(th); | |
140 | } | |
141 | ||
597cda35 ID |
142 | static int process_one_ticket(struct ceph_auth_client *ac, |
143 | struct ceph_crypto_key *secret, | |
c27a3e4d | 144 | void **p, void *end) |
597cda35 ID |
145 | { |
146 | struct ceph_x_info *xi = ac->private; | |
147 | int type; | |
148 | u8 tkt_struct_v, blob_struct_v; | |
149 | struct ceph_x_ticket_handler *th; | |
c27a3e4d | 150 | void *dbuf = NULL; |
597cda35 ID |
151 | void *dp, *dend; |
152 | int dlen; | |
153 | char is_enc; | |
154 | struct timespec validity; | |
c27a3e4d | 155 | void *ticket_buf = NULL; |
597cda35 | 156 | void *tp, *tpend; |
e9226d7c | 157 | void **ptp; |
597cda35 ID |
158 | struct ceph_crypto_key new_session_key; |
159 | struct ceph_buffer *new_ticket_blob; | |
160 | unsigned long new_expires, new_renew_after; | |
161 | u64 new_secret_id; | |
162 | int ret; | |
163 | ||
164 | ceph_decode_need(p, end, sizeof(u32) + 1, bad); | |
165 | ||
166 | type = ceph_decode_32(p); | |
167 | dout(" ticket type %d %s\n", type, ceph_entity_type_name(type)); | |
168 | ||
169 | tkt_struct_v = ceph_decode_8(p); | |
170 | if (tkt_struct_v != 1) | |
171 | goto bad; | |
172 | ||
173 | th = get_ticket_handler(ac, type); | |
174 | if (IS_ERR(th)) { | |
175 | ret = PTR_ERR(th); | |
176 | goto out; | |
177 | } | |
178 | ||
179 | /* blob for me */ | |
c27a3e4d | 180 | dlen = ceph_x_decrypt(secret, p, end, &dbuf, 0); |
597cda35 ID |
181 | if (dlen <= 0) { |
182 | ret = dlen; | |
183 | goto out; | |
184 | } | |
185 | dout(" decrypted %d bytes\n", dlen); | |
186 | dp = dbuf; | |
187 | dend = dp + dlen; | |
188 | ||
189 | tkt_struct_v = ceph_decode_8(&dp); | |
190 | if (tkt_struct_v != 1) | |
191 | goto bad; | |
192 | ||
597cda35 ID |
193 | ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); |
194 | if (ret) | |
195 | goto out; | |
196 | ||
f6cdb292 ID |
197 | ceph_decode_timespec(&validity, dp); |
198 | dp += sizeof(struct ceph_timespec); | |
597cda35 ID |
199 | new_expires = get_seconds() + validity.tv_sec; |
200 | new_renew_after = new_expires - (validity.tv_sec / 4); | |
201 | dout(" expires=%lu renew_after=%lu\n", new_expires, | |
202 | new_renew_after); | |
203 | ||
204 | /* ticket blob for service */ | |
205 | ceph_decode_8_safe(p, end, is_enc, bad); | |
597cda35 ID |
206 | if (is_enc) { |
207 | /* encrypted */ | |
208 | dout(" encrypted ticket\n"); | |
462e6504 | 209 | dlen = ceph_x_decrypt(&th->session_key, p, end, &ticket_buf, 0); |
597cda35 ID |
210 | if (dlen < 0) { |
211 | ret = dlen; | |
212 | goto out; | |
213 | } | |
c27a3e4d | 214 | tp = ticket_buf; |
e9226d7c ID |
215 | ptp = &tp; |
216 | tpend = *ptp + dlen; | |
597cda35 ID |
217 | } else { |
218 | /* unencrypted */ | |
e9226d7c ID |
219 | ptp = p; |
220 | tpend = end; | |
597cda35 | 221 | } |
e9226d7c | 222 | ceph_decode_32_safe(ptp, tpend, dlen, bad); |
597cda35 | 223 | dout(" ticket blob is %d bytes\n", dlen); |
e9226d7c ID |
224 | ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); |
225 | blob_struct_v = ceph_decode_8(ptp); | |
226 | new_secret_id = ceph_decode_64(ptp); | |
227 | ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); | |
597cda35 ID |
228 | if (ret) |
229 | goto out; | |
230 | ||
231 | /* all is well, update our ticket */ | |
232 | ceph_crypto_key_destroy(&th->session_key); | |
233 | if (th->ticket_blob) | |
234 | ceph_buffer_put(th->ticket_blob); | |
235 | th->session_key = new_session_key; | |
236 | th->ticket_blob = new_ticket_blob; | |
597cda35 ID |
237 | th->secret_id = new_secret_id; |
238 | th->expires = new_expires; | |
239 | th->renew_after = new_renew_after; | |
6abe097d | 240 | th->have_key = true; |
597cda35 ID |
241 | dout(" got ticket service %d (%s) secret_id %lld len %d\n", |
242 | type, ceph_entity_type_name(type), th->secret_id, | |
243 | (int)th->ticket_blob->vec.iov_len); | |
244 | xi->have_keys |= th->service; | |
245 | ||
246 | out: | |
c27a3e4d ID |
247 | kfree(ticket_buf); |
248 | kfree(dbuf); | |
597cda35 ID |
249 | return ret; |
250 | ||
251 | bad: | |
252 | ret = -EINVAL; | |
253 | goto out; | |
254 | } | |
255 | ||
ec0994e4 SW |
256 | static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, |
257 | struct ceph_crypto_key *secret, | |
258 | void *buf, void *end) | |
259 | { | |
ec0994e4 | 260 | void *p = buf; |
b736b3d9 | 261 | u8 reply_struct_v; |
597cda35 ID |
262 | u32 num; |
263 | int ret; | |
ec0994e4 | 264 | |
597cda35 | 265 | ceph_decode_8_safe(&p, end, reply_struct_v, bad); |
b736b3d9 | 266 | if (reply_struct_v != 1) |
597cda35 | 267 | return -EINVAL; |
ec0994e4 | 268 | |
597cda35 ID |
269 | ceph_decode_32_safe(&p, end, num, bad); |
270 | dout("%d tickets\n", num); | |
ec0994e4 | 271 | |
597cda35 | 272 | while (num--) { |
c27a3e4d | 273 | ret = process_one_ticket(ac, secret, &p, end); |
ec0994e4 | 274 | if (ret) |
c27a3e4d | 275 | return ret; |
ec0994e4 SW |
276 | } |
277 | ||
c27a3e4d | 278 | return 0; |
ec0994e4 SW |
279 | |
280 | bad: | |
c27a3e4d | 281 | return -EINVAL; |
ec0994e4 SW |
282 | } |
283 | ||
cbf99a11 ID |
284 | static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) |
285 | { | |
286 | ceph_crypto_key_destroy(&au->session_key); | |
287 | if (au->buf) { | |
288 | ceph_buffer_put(au->buf); | |
289 | au->buf = NULL; | |
290 | } | |
291 | } | |
292 | ||
ec0994e4 SW |
293 | static int ceph_x_build_authorizer(struct ceph_auth_client *ac, |
294 | struct ceph_x_ticket_handler *th, | |
295 | struct ceph_x_authorizer *au) | |
296 | { | |
807c86e2 | 297 | int maxlen; |
ec0994e4 SW |
298 | struct ceph_x_authorize_a *msg_a; |
299 | struct ceph_x_authorize_b msg_b; | |
300 | void *p, *end; | |
301 | int ret; | |
302 | int ticket_blob_len = | |
303 | (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); | |
304 | ||
305 | dout("build_authorizer for %s %p\n", | |
306 | ceph_entity_type_name(th->service), au); | |
307 | ||
ae385eaf YZ |
308 | ceph_crypto_key_destroy(&au->session_key); |
309 | ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); | |
310 | if (ret) | |
cbf99a11 | 311 | goto out_au; |
ae385eaf | 312 | |
36721ece ID |
313 | maxlen = sizeof(*msg_a) + ticket_blob_len + |
314 | ceph_x_encrypt_buflen(sizeof(msg_b)); | |
807c86e2 SW |
315 | dout(" need len %d\n", maxlen); |
316 | if (au->buf && au->buf->alloc_len < maxlen) { | |
ec0994e4 SW |
317 | ceph_buffer_put(au->buf); |
318 | au->buf = NULL; | |
319 | } | |
320 | if (!au->buf) { | |
807c86e2 | 321 | au->buf = ceph_buffer_new(maxlen, GFP_NOFS); |
ae385eaf | 322 | if (!au->buf) { |
cbf99a11 ID |
323 | ret = -ENOMEM; |
324 | goto out_au; | |
ae385eaf | 325 | } |
ec0994e4 SW |
326 | } |
327 | au->service = th->service; | |
0bed9b5c | 328 | au->secret_id = th->secret_id; |
ec0994e4 SW |
329 | |
330 | msg_a = au->buf->vec.iov_base; | |
331 | msg_a->struct_v = 1; | |
332 | msg_a->global_id = cpu_to_le64(ac->global_id); | |
333 | msg_a->service_id = cpu_to_le32(th->service); | |
334 | msg_a->ticket_blob.struct_v = 1; | |
335 | msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); | |
336 | msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); | |
337 | if (ticket_blob_len) { | |
338 | memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, | |
339 | th->ticket_blob->vec.iov_len); | |
340 | } | |
341 | dout(" th %p secret_id %lld %lld\n", th, th->secret_id, | |
342 | le64_to_cpu(msg_a->ticket_blob.secret_id)); | |
343 | ||
344 | p = msg_a + 1; | |
345 | p += ticket_blob_len; | |
346 | end = au->buf->vec.iov_base + au->buf->vec.iov_len; | |
347 | ||
348 | get_random_bytes(&au->nonce, sizeof(au->nonce)); | |
349 | msg_b.struct_v = 1; | |
350 | msg_b.nonce = cpu_to_le64(au->nonce); | |
ae385eaf | 351 | ret = ceph_x_encrypt(&au->session_key, &msg_b, sizeof(msg_b), |
ec0994e4 SW |
352 | p, end - p); |
353 | if (ret < 0) | |
cbf99a11 | 354 | goto out_au; |
36721ece | 355 | |
ec0994e4 | 356 | p += ret; |
36721ece | 357 | WARN_ON(p > end); |
ec0994e4 SW |
358 | au->buf->vec.iov_len = p - au->buf->vec.iov_base; |
359 | dout(" built authorizer nonce %llx len %d\n", au->nonce, | |
360 | (int)au->buf->vec.iov_len); | |
361 | return 0; | |
362 | ||
cbf99a11 ID |
363 | out_au: |
364 | ceph_x_authorizer_cleanup(au); | |
ec0994e4 SW |
365 | return ret; |
366 | } | |
367 | ||
368 | static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, | |
369 | void **p, void *end) | |
370 | { | |
371 | ceph_decode_need(p, end, 1 + sizeof(u64), bad); | |
372 | ceph_encode_8(p, 1); | |
373 | ceph_encode_64(p, th->secret_id); | |
374 | if (th->ticket_blob) { | |
375 | const char *buf = th->ticket_blob->vec.iov_base; | |
376 | u32 len = th->ticket_blob->vec.iov_len; | |
377 | ||
378 | ceph_encode_32_safe(p, end, len, bad); | |
379 | ceph_encode_copy_safe(p, end, buf, len, bad); | |
380 | } else { | |
381 | ceph_encode_32_safe(p, end, 0, bad); | |
382 | } | |
383 | ||
384 | return 0; | |
385 | bad: | |
386 | return -ERANGE; | |
387 | } | |
388 | ||
6abe097d ID |
389 | static bool need_key(struct ceph_x_ticket_handler *th) |
390 | { | |
391 | if (!th->have_key) | |
392 | return true; | |
393 | ||
394 | return get_seconds() >= th->renew_after; | |
395 | } | |
396 | ||
397 | static bool have_key(struct ceph_x_ticket_handler *th) | |
398 | { | |
399 | if (th->have_key) { | |
400 | if (get_seconds() >= th->expires) | |
401 | th->have_key = false; | |
402 | } | |
403 | ||
404 | return th->have_key; | |
405 | } | |
406 | ||
ec0994e4 SW |
407 | static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) |
408 | { | |
409 | int want = ac->want_keys; | |
410 | struct ceph_x_info *xi = ac->private; | |
411 | int service; | |
412 | ||
413 | *pneed = ac->want_keys & ~(xi->have_keys); | |
414 | ||
415 | for (service = 1; service <= want; service <<= 1) { | |
416 | struct ceph_x_ticket_handler *th; | |
417 | ||
418 | if (!(ac->want_keys & service)) | |
419 | continue; | |
420 | ||
421 | if (*pneed & service) | |
422 | continue; | |
423 | ||
424 | th = get_ticket_handler(ac, service); | |
b545787d | 425 | if (IS_ERR(th)) { |
ec0994e4 SW |
426 | *pneed |= service; |
427 | continue; | |
428 | } | |
429 | ||
6abe097d | 430 | if (need_key(th)) |
ec0994e4 | 431 | *pneed |= service; |
6abe097d | 432 | if (!have_key(th)) |
ec0994e4 SW |
433 | xi->have_keys &= ~service; |
434 | } | |
435 | } | |
436 | ||
ec0994e4 SW |
437 | static int ceph_x_build_request(struct ceph_auth_client *ac, |
438 | void *buf, void *end) | |
439 | { | |
440 | struct ceph_x_info *xi = ac->private; | |
441 | int need; | |
442 | struct ceph_x_request_header *head = buf; | |
443 | int ret; | |
444 | struct ceph_x_ticket_handler *th = | |
445 | get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); | |
446 | ||
b545787d DC |
447 | if (IS_ERR(th)) |
448 | return PTR_ERR(th); | |
449 | ||
ec0994e4 SW |
450 | ceph_x_validate_tickets(ac, &need); |
451 | ||
452 | dout("build_request want %x have %x need %x\n", | |
453 | ac->want_keys, xi->have_keys, need); | |
454 | ||
455 | if (need & CEPH_ENTITY_TYPE_AUTH) { | |
456 | struct ceph_x_authenticate *auth = (void *)(head + 1); | |
457 | void *p = auth + 1; | |
458 | struct ceph_x_challenge_blob tmp; | |
459 | char tmp_enc[40]; | |
460 | u64 *u; | |
461 | ||
462 | if (p > end) | |
463 | return -ERANGE; | |
464 | ||
465 | dout(" get_auth_session_key\n"); | |
466 | head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); | |
467 | ||
468 | /* encrypt and hash */ | |
469 | get_random_bytes(&auth->client_challenge, sizeof(u64)); | |
470 | tmp.client_challenge = auth->client_challenge; | |
471 | tmp.server_challenge = cpu_to_le64(xi->server_challenge); | |
472 | ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp), | |
473 | tmp_enc, sizeof(tmp_enc)); | |
474 | if (ret < 0) | |
475 | return ret; | |
476 | ||
477 | auth->struct_v = 1; | |
478 | auth->key = 0; | |
479 | for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++) | |
cd84db6e | 480 | auth->key ^= *(__le64 *)u; |
ec0994e4 SW |
481 | dout(" server_challenge %llx client_challenge %llx key %llx\n", |
482 | xi->server_challenge, le64_to_cpu(auth->client_challenge), | |
483 | le64_to_cpu(auth->key)); | |
484 | ||
485 | /* now encode the old ticket if exists */ | |
486 | ret = ceph_x_encode_ticket(th, &p, end); | |
487 | if (ret < 0) | |
488 | return ret; | |
489 | ||
490 | return p - buf; | |
491 | } | |
492 | ||
493 | if (need) { | |
494 | void *p = head + 1; | |
495 | struct ceph_x_service_ticket_request *req; | |
496 | ||
497 | if (p > end) | |
498 | return -ERANGE; | |
499 | head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY); | |
500 | ||
ec0994e4 SW |
501 | ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); |
502 | if (ret) | |
503 | return ret; | |
504 | ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base, | |
505 | xi->auth_authorizer.buf->vec.iov_len); | |
506 | ||
507 | req = p; | |
508 | req->keys = cpu_to_le32(need); | |
509 | p += sizeof(*req); | |
510 | return p - buf; | |
511 | } | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
516 | static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result, | |
517 | void *buf, void *end) | |
518 | { | |
519 | struct ceph_x_info *xi = ac->private; | |
520 | struct ceph_x_reply_header *head = buf; | |
521 | struct ceph_x_ticket_handler *th; | |
522 | int len = end - buf; | |
523 | int op; | |
524 | int ret; | |
525 | ||
526 | if (result) | |
527 | return result; /* XXX hmm? */ | |
528 | ||
529 | if (xi->starting) { | |
530 | /* it's a hello */ | |
531 | struct ceph_x_server_challenge *sc = buf; | |
532 | ||
533 | if (len != sizeof(*sc)) | |
534 | return -EINVAL; | |
535 | xi->server_challenge = le64_to_cpu(sc->server_challenge); | |
536 | dout("handle_reply got server challenge %llx\n", | |
537 | xi->server_challenge); | |
538 | xi->starting = false; | |
539 | xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; | |
540 | return -EAGAIN; | |
541 | } | |
542 | ||
0cf5537b | 543 | op = le16_to_cpu(head->op); |
ec0994e4 SW |
544 | result = le32_to_cpu(head->result); |
545 | dout("handle_reply op %d result %d\n", op, result); | |
546 | switch (op) { | |
547 | case CEPHX_GET_AUTH_SESSION_KEY: | |
548 | /* verify auth key */ | |
549 | ret = ceph_x_proc_ticket_reply(ac, &xi->secret, | |
550 | buf + sizeof(*head), end); | |
551 | break; | |
552 | ||
553 | case CEPHX_GET_PRINCIPAL_SESSION_KEY: | |
554 | th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); | |
b545787d DC |
555 | if (IS_ERR(th)) |
556 | return PTR_ERR(th); | |
ec0994e4 SW |
557 | ret = ceph_x_proc_ticket_reply(ac, &th->session_key, |
558 | buf + sizeof(*head), end); | |
559 | break; | |
560 | ||
561 | default: | |
562 | return -EINVAL; | |
563 | } | |
564 | if (ret) | |
565 | return ret; | |
566 | if (ac->want_keys == xi->have_keys) | |
567 | return 0; | |
568 | return -EAGAIN; | |
569 | } | |
570 | ||
6c1ea260 ID |
571 | static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) |
572 | { | |
573 | struct ceph_x_authorizer *au = (void *)a; | |
574 | ||
575 | ceph_x_authorizer_cleanup(au); | |
576 | kfree(au); | |
577 | } | |
578 | ||
ec0994e4 SW |
579 | static int ceph_x_create_authorizer( |
580 | struct ceph_auth_client *ac, int peer_type, | |
74f1869f | 581 | struct ceph_auth_handshake *auth) |
ec0994e4 SW |
582 | { |
583 | struct ceph_x_authorizer *au; | |
584 | struct ceph_x_ticket_handler *th; | |
585 | int ret; | |
586 | ||
587 | th = get_ticket_handler(ac, peer_type); | |
588 | if (IS_ERR(th)) | |
589 | return PTR_ERR(th); | |
590 | ||
591 | au = kzalloc(sizeof(*au), GFP_NOFS); | |
592 | if (!au) | |
593 | return -ENOMEM; | |
594 | ||
6c1ea260 ID |
595 | au->base.destroy = ceph_x_destroy_authorizer; |
596 | ||
ec0994e4 SW |
597 | ret = ceph_x_build_authorizer(ac, th, au); |
598 | if (ret) { | |
599 | kfree(au); | |
600 | return ret; | |
601 | } | |
602 | ||
74f1869f AE |
603 | auth->authorizer = (struct ceph_authorizer *) au; |
604 | auth->authorizer_buf = au->buf->vec.iov_base; | |
605 | auth->authorizer_buf_len = au->buf->vec.iov_len; | |
7882a26d ID |
606 | auth->authorizer_reply_buf = au->enc_buf; |
607 | auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; | |
33d07337 YZ |
608 | auth->sign_message = ac->ops->sign_message; |
609 | auth->check_message_signature = ac->ops->check_message_signature; | |
74f1869f | 610 | |
ec0994e4 SW |
611 | return 0; |
612 | } | |
613 | ||
0bed9b5c SW |
614 | static int ceph_x_update_authorizer( |
615 | struct ceph_auth_client *ac, int peer_type, | |
616 | struct ceph_auth_handshake *auth) | |
617 | { | |
618 | struct ceph_x_authorizer *au; | |
619 | struct ceph_x_ticket_handler *th; | |
0bed9b5c SW |
620 | |
621 | th = get_ticket_handler(ac, peer_type); | |
622 | if (IS_ERR(th)) | |
623 | return PTR_ERR(th); | |
624 | ||
625 | au = (struct ceph_x_authorizer *)auth->authorizer; | |
626 | if (au->secret_id < th->secret_id) { | |
627 | dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", | |
628 | au->service, au->secret_id, th->secret_id); | |
629 | return ceph_x_build_authorizer(ac, th, au); | |
630 | } | |
631 | return 0; | |
632 | } | |
633 | ||
ec0994e4 SW |
634 | static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, |
635 | struct ceph_authorizer *a, size_t len) | |
636 | { | |
637 | struct ceph_x_authorizer *au = (void *)a; | |
ec0994e4 SW |
638 | int ret = 0; |
639 | struct ceph_x_authorize_reply reply; | |
c27a3e4d | 640 | void *preply = &reply; |
7882a26d | 641 | void *p = au->enc_buf; |
ec0994e4 | 642 | |
7882a26d ID |
643 | ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN, |
644 | &preply, sizeof(reply)); | |
ec0994e4 SW |
645 | if (ret < 0) |
646 | return ret; | |
647 | if (ret != sizeof(reply)) | |
648 | return -EPERM; | |
649 | ||
650 | if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one)) | |
651 | ret = -EPERM; | |
652 | else | |
653 | ret = 0; | |
654 | dout("verify_authorizer_reply nonce %llx got %llx ret %d\n", | |
655 | au->nonce, le64_to_cpu(reply.nonce_plus_one), ret); | |
656 | return ret; | |
657 | } | |
658 | ||
ec0994e4 SW |
659 | static void ceph_x_reset(struct ceph_auth_client *ac) |
660 | { | |
661 | struct ceph_x_info *xi = ac->private; | |
662 | ||
663 | dout("reset\n"); | |
664 | xi->starting = true; | |
665 | xi->server_challenge = 0; | |
666 | } | |
667 | ||
668 | static void ceph_x_destroy(struct ceph_auth_client *ac) | |
669 | { | |
670 | struct ceph_x_info *xi = ac->private; | |
671 | struct rb_node *p; | |
672 | ||
673 | dout("ceph_x_destroy %p\n", ac); | |
674 | ceph_crypto_key_destroy(&xi->secret); | |
675 | ||
676 | while ((p = rb_first(&xi->ticket_handlers)) != NULL) { | |
677 | struct ceph_x_ticket_handler *th = | |
678 | rb_entry(p, struct ceph_x_ticket_handler, node); | |
679 | remove_ticket_handler(ac, th); | |
680 | } | |
681 | ||
cbf99a11 | 682 | ceph_x_authorizer_cleanup(&xi->auth_authorizer); |
22b1de06 | 683 | |
ec0994e4 SW |
684 | kfree(ac->private); |
685 | ac->private = NULL; | |
686 | } | |
687 | ||
187d131d | 688 | static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) |
ec0994e4 SW |
689 | { |
690 | struct ceph_x_ticket_handler *th; | |
691 | ||
692 | th = get_ticket_handler(ac, peer_type); | |
b545787d | 693 | if (!IS_ERR(th)) |
6abe097d | 694 | th->have_key = false; |
ec0994e4 SW |
695 | } |
696 | ||
187d131d ID |
697 | static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, |
698 | int peer_type) | |
699 | { | |
700 | /* | |
701 | * We are to invalidate a service ticket in the hopes of | |
702 | * getting a new, hopefully more valid, one. But, we won't get | |
703 | * it unless our AUTH ticket is good, so invalidate AUTH ticket | |
704 | * as well, just in case. | |
705 | */ | |
706 | invalidate_ticket(ac, peer_type); | |
707 | invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); | |
708 | } | |
709 | ||
4eb4517c ID |
710 | static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, |
711 | __le64 *psig) | |
33d07337 | 712 | { |
33d07337 | 713 | char tmp_enc[40]; |
4eb4517c ID |
714 | struct { |
715 | __le32 len; | |
716 | __le32 header_crc; | |
717 | __le32 front_crc; | |
718 | __le32 middle_crc; | |
719 | __le32 data_crc; | |
720 | } __packed sigblock; | |
721 | int ret; | |
722 | ||
723 | sigblock.len = cpu_to_le32(4*sizeof(u32)); | |
724 | sigblock.header_crc = msg->hdr.crc; | |
725 | sigblock.front_crc = msg->footer.front_crc; | |
726 | sigblock.middle_crc = msg->footer.middle_crc; | |
727 | sigblock.data_crc = msg->footer.data_crc; | |
728 | ret = ceph_x_encrypt(&au->session_key, &sigblock, sizeof(sigblock), | |
33d07337 YZ |
729 | tmp_enc, sizeof(tmp_enc)); |
730 | if (ret < 0) | |
731 | return ret; | |
4eb4517c ID |
732 | |
733 | *psig = *(__le64 *)(tmp_enc + sizeof(u32)); | |
33d07337 YZ |
734 | return 0; |
735 | } | |
736 | ||
737 | static int ceph_x_sign_message(struct ceph_auth_handshake *auth, | |
738 | struct ceph_msg *msg) | |
739 | { | |
4eb4517c | 740 | __le64 sig; |
33d07337 | 741 | int ret; |
4199b8ee | 742 | |
a51983e4 ID |
743 | if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) |
744 | return 0; | |
745 | ||
4eb4517c ID |
746 | ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, |
747 | msg, &sig); | |
748 | if (ret) | |
33d07337 | 749 | return ret; |
4eb4517c ID |
750 | |
751 | msg->footer.sig = sig; | |
33d07337 YZ |
752 | msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; |
753 | return 0; | |
754 | } | |
755 | ||
756 | static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, | |
757 | struct ceph_msg *msg) | |
758 | { | |
759 | __le64 sig_check; | |
760 | int ret; | |
761 | ||
a51983e4 ID |
762 | if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) |
763 | return 0; | |
764 | ||
4eb4517c ID |
765 | ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, |
766 | msg, &sig_check); | |
767 | if (ret) | |
33d07337 YZ |
768 | return ret; |
769 | if (sig_check == msg->footer.sig) | |
770 | return 0; | |
771 | if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) | |
772 | dout("ceph_x_check_message_signature %p has signature %llx " | |
773 | "expect %llx\n", msg, msg->footer.sig, sig_check); | |
774 | else | |
775 | dout("ceph_x_check_message_signature %p sender did not set " | |
776 | "CEPH_MSG_FOOTER_SIGNED\n", msg); | |
777 | return -EBADMSG; | |
778 | } | |
ec0994e4 SW |
779 | |
780 | static const struct ceph_auth_client_ops ceph_x_ops = { | |
559c1e00 | 781 | .name = "x", |
ec0994e4 | 782 | .is_authenticated = ceph_x_is_authenticated, |
a41359fa | 783 | .should_authenticate = ceph_x_should_authenticate, |
ec0994e4 SW |
784 | .build_request = ceph_x_build_request, |
785 | .handle_reply = ceph_x_handle_reply, | |
786 | .create_authorizer = ceph_x_create_authorizer, | |
0bed9b5c | 787 | .update_authorizer = ceph_x_update_authorizer, |
ec0994e4 | 788 | .verify_authorizer_reply = ceph_x_verify_authorizer_reply, |
ec0994e4 SW |
789 | .invalidate_authorizer = ceph_x_invalidate_authorizer, |
790 | .reset = ceph_x_reset, | |
791 | .destroy = ceph_x_destroy, | |
33d07337 YZ |
792 | .sign_message = ceph_x_sign_message, |
793 | .check_message_signature = ceph_x_check_message_signature, | |
ec0994e4 SW |
794 | }; |
795 | ||
796 | ||
797 | int ceph_x_init(struct ceph_auth_client *ac) | |
798 | { | |
799 | struct ceph_x_info *xi; | |
800 | int ret; | |
801 | ||
802 | dout("ceph_x_init %p\n", ac); | |
b0930f8d | 803 | ret = -ENOMEM; |
ec0994e4 SW |
804 | xi = kzalloc(sizeof(*xi), GFP_NOFS); |
805 | if (!xi) | |
b0930f8d | 806 | goto out; |
ec0994e4 | 807 | |
ec0994e4 | 808 | ret = -EINVAL; |
8323c3aa | 809 | if (!ac->key) { |
ec0994e4 | 810 | pr_err("no secret set (for auth_x protocol)\n"); |
b0930f8d | 811 | goto out_nomem; |
ec0994e4 SW |
812 | } |
813 | ||
8323c3aa TV |
814 | ret = ceph_crypto_key_clone(&xi->secret, ac->key); |
815 | if (ret < 0) { | |
816 | pr_err("cannot clone key: %d\n", ret); | |
b0930f8d | 817 | goto out_nomem; |
8323c3aa | 818 | } |
ec0994e4 SW |
819 | |
820 | xi->starting = true; | |
821 | xi->ticket_handlers = RB_ROOT; | |
822 | ||
823 | ac->protocol = CEPH_AUTH_CEPHX; | |
824 | ac->private = xi; | |
825 | ac->ops = &ceph_x_ops; | |
826 | return 0; | |
827 | ||
b0930f8d | 828 | out_nomem: |
ec0994e4 | 829 | kfree(xi); |
b0930f8d | 830 | out: |
ec0994e4 SW |
831 | return ret; |
832 | } | |
833 | ||
834 |