Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ec0994e4 | 2 | |
3d14c5d2 | 3 | #include <linux/ceph/ceph_debug.h> |
ec0994e4 SW |
4 | |
5 | #include <linux/err.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/random.h> | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
ec0994e4 | 9 | |
3d14c5d2 YS |
10 | #include <linux/ceph/decode.h> |
11 | #include <linux/ceph/auth.h> | |
a51983e4 | 12 | #include <linux/ceph/libceph.h> |
33d07337 | 13 | #include <linux/ceph/messenger.h> |
3d14c5d2 YS |
14 | |
15 | #include "crypto.h" | |
ec0994e4 SW |
16 | #include "auth_x.h" |
17 | #include "auth_x_protocol.h" | |
ec0994e4 | 18 | |
ec0994e4 SW |
19 | static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed); |
20 | ||
21 | static int ceph_x_is_authenticated(struct ceph_auth_client *ac) | |
22 | { | |
23 | struct ceph_x_info *xi = ac->private; | |
24 | int need; | |
25 | ||
26 | ceph_x_validate_tickets(ac, &need); | |
27 | dout("ceph_x_is_authenticated want=%d need=%d have=%d\n", | |
28 | ac->want_keys, need, xi->have_keys); | |
29 | return (ac->want_keys & xi->have_keys) == ac->want_keys; | |
30 | } | |
31 | ||
a41359fa SW |
32 | static int ceph_x_should_authenticate(struct ceph_auth_client *ac) |
33 | { | |
34 | struct ceph_x_info *xi = ac->private; | |
35 | int need; | |
36 | ||
37 | ceph_x_validate_tickets(ac, &need); | |
38 | dout("ceph_x_should_authenticate want=%d need=%d have=%d\n", | |
39 | ac->want_keys, need, xi->have_keys); | |
40 | return need != 0; | |
41 | } | |
42 | ||
55d9cc83 ID |
43 | static int ceph_x_encrypt_offset(void) |
44 | { | |
45 | return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); | |
46 | } | |
47 | ||
807c86e2 SW |
48 | static int ceph_x_encrypt_buflen(int ilen) |
49 | { | |
55d9cc83 | 50 | return ceph_x_encrypt_offset() + ilen + 16; |
807c86e2 SW |
51 | } |
52 | ||
d03857c6 ID |
53 | static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf, |
54 | int buf_len, int plaintext_len) | |
ec0994e4 | 55 | { |
d03857c6 ID |
56 | struct ceph_x_encrypt_header *hdr = buf + sizeof(u32); |
57 | int ciphertext_len; | |
ec0994e4 SW |
58 | int ret; |
59 | ||
d03857c6 ID |
60 | hdr->struct_v = 1; |
61 | hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC); | |
62 | ||
63 | ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32), | |
64 | plaintext_len + sizeof(struct ceph_x_encrypt_header), | |
65 | &ciphertext_len); | |
ec0994e4 SW |
66 | if (ret) |
67 | return ret; | |
d03857c6 ID |
68 | |
69 | ceph_encode_32(&buf, ciphertext_len); | |
70 | return sizeof(u32) + ciphertext_len; | |
ec0994e4 SW |
71 | } |
72 | ||
e15fd0a1 | 73 | static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end) |
ec0994e4 | 74 | { |
e15fd0a1 ID |
75 | struct ceph_x_encrypt_header *hdr = *p + sizeof(u32); |
76 | int ciphertext_len, plaintext_len; | |
77 | int ret; | |
ec0994e4 | 78 | |
e15fd0a1 ID |
79 | ceph_decode_32_safe(p, end, ciphertext_len, e_inval); |
80 | ceph_decode_need(p, end, ciphertext_len, e_inval); | |
c27a3e4d | 81 | |
e15fd0a1 ID |
82 | ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len, |
83 | &plaintext_len); | |
ec0994e4 SW |
84 | if (ret) |
85 | return ret; | |
e15fd0a1 ID |
86 | |
87 | if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) | |
ec0994e4 | 88 | return -EPERM; |
e15fd0a1 ID |
89 | |
90 | *p += ciphertext_len; | |
91 | return plaintext_len - sizeof(struct ceph_x_encrypt_header); | |
92 | ||
93 | e_inval: | |
94 | return -EINVAL; | |
ec0994e4 SW |
95 | } |
96 | ||
97 | /* | |
98 | * get existing (or insert new) ticket handler | |
99 | */ | |
cd84db6e YS |
100 | static struct ceph_x_ticket_handler * |
101 | get_ticket_handler(struct ceph_auth_client *ac, int service) | |
ec0994e4 SW |
102 | { |
103 | struct ceph_x_ticket_handler *th; | |
104 | struct ceph_x_info *xi = ac->private; | |
105 | struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; | |
106 | ||
107 | while (*p) { | |
108 | parent = *p; | |
109 | th = rb_entry(parent, struct ceph_x_ticket_handler, node); | |
110 | if (service < th->service) | |
111 | p = &(*p)->rb_left; | |
112 | else if (service > th->service) | |
113 | p = &(*p)->rb_right; | |
114 | else | |
115 | return th; | |
116 | } | |
117 | ||
118 | /* add it */ | |
119 | th = kzalloc(sizeof(*th), GFP_NOFS); | |
120 | if (!th) | |
121 | return ERR_PTR(-ENOMEM); | |
122 | th->service = service; | |
123 | rb_link_node(&th->node, parent, p); | |
124 | rb_insert_color(&th->node, &xi->ticket_handlers); | |
125 | return th; | |
126 | } | |
127 | ||
128 | static void remove_ticket_handler(struct ceph_auth_client *ac, | |
129 | struct ceph_x_ticket_handler *th) | |
130 | { | |
131 | struct ceph_x_info *xi = ac->private; | |
132 | ||
133 | dout("remove_ticket_handler %p %d\n", th, th->service); | |
134 | rb_erase(&th->node, &xi->ticket_handlers); | |
135 | ceph_crypto_key_destroy(&th->session_key); | |
136 | if (th->ticket_blob) | |
137 | ceph_buffer_put(th->ticket_blob); | |
138 | kfree(th); | |
139 | } | |
140 | ||
597cda35 ID |
141 | static int process_one_ticket(struct ceph_auth_client *ac, |
142 | struct ceph_crypto_key *secret, | |
c27a3e4d | 143 | void **p, void *end) |
597cda35 ID |
144 | { |
145 | struct ceph_x_info *xi = ac->private; | |
146 | int type; | |
147 | u8 tkt_struct_v, blob_struct_v; | |
148 | struct ceph_x_ticket_handler *th; | |
149 | void *dp, *dend; | |
150 | int dlen; | |
151 | char is_enc; | |
152 | struct timespec validity; | |
597cda35 | 153 | void *tp, *tpend; |
e9226d7c | 154 | void **ptp; |
b51456a6 | 155 | struct ceph_crypto_key new_session_key = { 0 }; |
597cda35 ID |
156 | struct ceph_buffer *new_ticket_blob; |
157 | unsigned long new_expires, new_renew_after; | |
158 | u64 new_secret_id; | |
159 | int ret; | |
160 | ||
161 | ceph_decode_need(p, end, sizeof(u32) + 1, bad); | |
162 | ||
163 | type = ceph_decode_32(p); | |
164 | dout(" ticket type %d %s\n", type, ceph_entity_type_name(type)); | |
165 | ||
166 | tkt_struct_v = ceph_decode_8(p); | |
167 | if (tkt_struct_v != 1) | |
168 | goto bad; | |
169 | ||
170 | th = get_ticket_handler(ac, type); | |
171 | if (IS_ERR(th)) { | |
172 | ret = PTR_ERR(th); | |
173 | goto out; | |
174 | } | |
175 | ||
176 | /* blob for me */ | |
e15fd0a1 ID |
177 | dp = *p + ceph_x_encrypt_offset(); |
178 | ret = ceph_x_decrypt(secret, p, end); | |
179 | if (ret < 0) | |
597cda35 | 180 | goto out; |
e15fd0a1 ID |
181 | dout(" decrypted %d bytes\n", ret); |
182 | dend = dp + ret; | |
597cda35 ID |
183 | |
184 | tkt_struct_v = ceph_decode_8(&dp); | |
185 | if (tkt_struct_v != 1) | |
186 | goto bad; | |
187 | ||
597cda35 ID |
188 | ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); |
189 | if (ret) | |
190 | goto out; | |
191 | ||
f6cdb292 ID |
192 | ceph_decode_timespec(&validity, dp); |
193 | dp += sizeof(struct ceph_timespec); | |
597cda35 ID |
194 | new_expires = get_seconds() + validity.tv_sec; |
195 | new_renew_after = new_expires - (validity.tv_sec / 4); | |
196 | dout(" expires=%lu renew_after=%lu\n", new_expires, | |
197 | new_renew_after); | |
198 | ||
199 | /* ticket blob for service */ | |
200 | ceph_decode_8_safe(p, end, is_enc, bad); | |
597cda35 ID |
201 | if (is_enc) { |
202 | /* encrypted */ | |
e15fd0a1 ID |
203 | tp = *p + ceph_x_encrypt_offset(); |
204 | ret = ceph_x_decrypt(&th->session_key, p, end); | |
205 | if (ret < 0) | |
597cda35 | 206 | goto out; |
e15fd0a1 | 207 | dout(" encrypted ticket, decrypted %d bytes\n", ret); |
e9226d7c | 208 | ptp = &tp; |
e15fd0a1 | 209 | tpend = tp + ret; |
597cda35 ID |
210 | } else { |
211 | /* unencrypted */ | |
e9226d7c ID |
212 | ptp = p; |
213 | tpend = end; | |
597cda35 | 214 | } |
e9226d7c | 215 | ceph_decode_32_safe(ptp, tpend, dlen, bad); |
597cda35 | 216 | dout(" ticket blob is %d bytes\n", dlen); |
e9226d7c ID |
217 | ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); |
218 | blob_struct_v = ceph_decode_8(ptp); | |
d18a1247 ID |
219 | if (blob_struct_v != 1) |
220 | goto bad; | |
221 | ||
e9226d7c ID |
222 | new_secret_id = ceph_decode_64(ptp); |
223 | ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); | |
597cda35 ID |
224 | if (ret) |
225 | goto out; | |
226 | ||
227 | /* all is well, update our ticket */ | |
228 | ceph_crypto_key_destroy(&th->session_key); | |
229 | if (th->ticket_blob) | |
230 | ceph_buffer_put(th->ticket_blob); | |
231 | th->session_key = new_session_key; | |
232 | th->ticket_blob = new_ticket_blob; | |
597cda35 ID |
233 | th->secret_id = new_secret_id; |
234 | th->expires = new_expires; | |
235 | th->renew_after = new_renew_after; | |
6abe097d | 236 | th->have_key = true; |
597cda35 ID |
237 | dout(" got ticket service %d (%s) secret_id %lld len %d\n", |
238 | type, ceph_entity_type_name(type), th->secret_id, | |
239 | (int)th->ticket_blob->vec.iov_len); | |
240 | xi->have_keys |= th->service; | |
b51456a6 | 241 | return 0; |
597cda35 ID |
242 | |
243 | bad: | |
244 | ret = -EINVAL; | |
b51456a6 ID |
245 | out: |
246 | ceph_crypto_key_destroy(&new_session_key); | |
247 | return ret; | |
597cda35 ID |
248 | } |
249 | ||
ec0994e4 SW |
250 | static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, |
251 | struct ceph_crypto_key *secret, | |
252 | void *buf, void *end) | |
253 | { | |
ec0994e4 | 254 | void *p = buf; |
b736b3d9 | 255 | u8 reply_struct_v; |
597cda35 ID |
256 | u32 num; |
257 | int ret; | |
ec0994e4 | 258 | |
597cda35 | 259 | ceph_decode_8_safe(&p, end, reply_struct_v, bad); |
b736b3d9 | 260 | if (reply_struct_v != 1) |
597cda35 | 261 | return -EINVAL; |
ec0994e4 | 262 | |
597cda35 ID |
263 | ceph_decode_32_safe(&p, end, num, bad); |
264 | dout("%d tickets\n", num); | |
ec0994e4 | 265 | |
597cda35 | 266 | while (num--) { |
c27a3e4d | 267 | ret = process_one_ticket(ac, secret, &p, end); |
ec0994e4 | 268 | if (ret) |
c27a3e4d | 269 | return ret; |
ec0994e4 SW |
270 | } |
271 | ||
c27a3e4d | 272 | return 0; |
ec0994e4 SW |
273 | |
274 | bad: | |
c27a3e4d | 275 | return -EINVAL; |
ec0994e4 SW |
276 | } |
277 | ||
cbf99a11 ID |
278 | static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) |
279 | { | |
280 | ceph_crypto_key_destroy(&au->session_key); | |
281 | if (au->buf) { | |
282 | ceph_buffer_put(au->buf); | |
283 | au->buf = NULL; | |
284 | } | |
285 | } | |
286 | ||
ec0994e4 SW |
287 | static int ceph_x_build_authorizer(struct ceph_auth_client *ac, |
288 | struct ceph_x_ticket_handler *th, | |
289 | struct ceph_x_authorizer *au) | |
290 | { | |
807c86e2 | 291 | int maxlen; |
ec0994e4 | 292 | struct ceph_x_authorize_a *msg_a; |
d03857c6 | 293 | struct ceph_x_authorize_b *msg_b; |
ec0994e4 SW |
294 | void *p, *end; |
295 | int ret; | |
296 | int ticket_blob_len = | |
297 | (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); | |
298 | ||
299 | dout("build_authorizer for %s %p\n", | |
300 | ceph_entity_type_name(th->service), au); | |
301 | ||
ae385eaf YZ |
302 | ceph_crypto_key_destroy(&au->session_key); |
303 | ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); | |
304 | if (ret) | |
cbf99a11 | 305 | goto out_au; |
ae385eaf | 306 | |
36721ece | 307 | maxlen = sizeof(*msg_a) + ticket_blob_len + |
d03857c6 | 308 | ceph_x_encrypt_buflen(sizeof(*msg_b)); |
807c86e2 SW |
309 | dout(" need len %d\n", maxlen); |
310 | if (au->buf && au->buf->alloc_len < maxlen) { | |
ec0994e4 SW |
311 | ceph_buffer_put(au->buf); |
312 | au->buf = NULL; | |
313 | } | |
314 | if (!au->buf) { | |
807c86e2 | 315 | au->buf = ceph_buffer_new(maxlen, GFP_NOFS); |
ae385eaf | 316 | if (!au->buf) { |
cbf99a11 ID |
317 | ret = -ENOMEM; |
318 | goto out_au; | |
ae385eaf | 319 | } |
ec0994e4 SW |
320 | } |
321 | au->service = th->service; | |
0bed9b5c | 322 | au->secret_id = th->secret_id; |
ec0994e4 SW |
323 | |
324 | msg_a = au->buf->vec.iov_base; | |
325 | msg_a->struct_v = 1; | |
326 | msg_a->global_id = cpu_to_le64(ac->global_id); | |
327 | msg_a->service_id = cpu_to_le32(th->service); | |
328 | msg_a->ticket_blob.struct_v = 1; | |
329 | msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); | |
330 | msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); | |
331 | if (ticket_blob_len) { | |
332 | memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, | |
333 | th->ticket_blob->vec.iov_len); | |
334 | } | |
335 | dout(" th %p secret_id %lld %lld\n", th, th->secret_id, | |
336 | le64_to_cpu(msg_a->ticket_blob.secret_id)); | |
337 | ||
338 | p = msg_a + 1; | |
339 | p += ticket_blob_len; | |
340 | end = au->buf->vec.iov_base + au->buf->vec.iov_len; | |
341 | ||
d03857c6 ID |
342 | msg_b = p + ceph_x_encrypt_offset(); |
343 | msg_b->struct_v = 1; | |
ec0994e4 | 344 | get_random_bytes(&au->nonce, sizeof(au->nonce)); |
d03857c6 ID |
345 | msg_b->nonce = cpu_to_le64(au->nonce); |
346 | ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b)); | |
ec0994e4 | 347 | if (ret < 0) |
cbf99a11 | 348 | goto out_au; |
36721ece | 349 | |
ec0994e4 | 350 | p += ret; |
36721ece | 351 | WARN_ON(p > end); |
ec0994e4 SW |
352 | au->buf->vec.iov_len = p - au->buf->vec.iov_base; |
353 | dout(" built authorizer nonce %llx len %d\n", au->nonce, | |
354 | (int)au->buf->vec.iov_len); | |
355 | return 0; | |
356 | ||
cbf99a11 ID |
357 | out_au: |
358 | ceph_x_authorizer_cleanup(au); | |
ec0994e4 SW |
359 | return ret; |
360 | } | |
361 | ||
362 | static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, | |
363 | void **p, void *end) | |
364 | { | |
365 | ceph_decode_need(p, end, 1 + sizeof(u64), bad); | |
366 | ceph_encode_8(p, 1); | |
367 | ceph_encode_64(p, th->secret_id); | |
368 | if (th->ticket_blob) { | |
369 | const char *buf = th->ticket_blob->vec.iov_base; | |
370 | u32 len = th->ticket_blob->vec.iov_len; | |
371 | ||
372 | ceph_encode_32_safe(p, end, len, bad); | |
373 | ceph_encode_copy_safe(p, end, buf, len, bad); | |
374 | } else { | |
375 | ceph_encode_32_safe(p, end, 0, bad); | |
376 | } | |
377 | ||
378 | return 0; | |
379 | bad: | |
380 | return -ERANGE; | |
381 | } | |
382 | ||
6abe097d ID |
383 | static bool need_key(struct ceph_x_ticket_handler *th) |
384 | { | |
385 | if (!th->have_key) | |
386 | return true; | |
387 | ||
388 | return get_seconds() >= th->renew_after; | |
389 | } | |
390 | ||
391 | static bool have_key(struct ceph_x_ticket_handler *th) | |
392 | { | |
393 | if (th->have_key) { | |
394 | if (get_seconds() >= th->expires) | |
395 | th->have_key = false; | |
396 | } | |
397 | ||
398 | return th->have_key; | |
399 | } | |
400 | ||
ec0994e4 SW |
401 | static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) |
402 | { | |
403 | int want = ac->want_keys; | |
404 | struct ceph_x_info *xi = ac->private; | |
405 | int service; | |
406 | ||
407 | *pneed = ac->want_keys & ~(xi->have_keys); | |
408 | ||
409 | for (service = 1; service <= want; service <<= 1) { | |
410 | struct ceph_x_ticket_handler *th; | |
411 | ||
412 | if (!(ac->want_keys & service)) | |
413 | continue; | |
414 | ||
415 | if (*pneed & service) | |
416 | continue; | |
417 | ||
418 | th = get_ticket_handler(ac, service); | |
b545787d | 419 | if (IS_ERR(th)) { |
ec0994e4 SW |
420 | *pneed |= service; |
421 | continue; | |
422 | } | |
423 | ||
6abe097d | 424 | if (need_key(th)) |
ec0994e4 | 425 | *pneed |= service; |
6abe097d | 426 | if (!have_key(th)) |
ec0994e4 SW |
427 | xi->have_keys &= ~service; |
428 | } | |
429 | } | |
430 | ||
ec0994e4 SW |
431 | static int ceph_x_build_request(struct ceph_auth_client *ac, |
432 | void *buf, void *end) | |
433 | { | |
434 | struct ceph_x_info *xi = ac->private; | |
435 | int need; | |
436 | struct ceph_x_request_header *head = buf; | |
437 | int ret; | |
438 | struct ceph_x_ticket_handler *th = | |
439 | get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); | |
440 | ||
b545787d DC |
441 | if (IS_ERR(th)) |
442 | return PTR_ERR(th); | |
443 | ||
ec0994e4 SW |
444 | ceph_x_validate_tickets(ac, &need); |
445 | ||
446 | dout("build_request want %x have %x need %x\n", | |
447 | ac->want_keys, xi->have_keys, need); | |
448 | ||
449 | if (need & CEPH_ENTITY_TYPE_AUTH) { | |
450 | struct ceph_x_authenticate *auth = (void *)(head + 1); | |
451 | void *p = auth + 1; | |
d03857c6 ID |
452 | void *enc_buf = xi->auth_authorizer.enc_buf; |
453 | struct ceph_x_challenge_blob *blob = enc_buf + | |
454 | ceph_x_encrypt_offset(); | |
ec0994e4 SW |
455 | u64 *u; |
456 | ||
457 | if (p > end) | |
458 | return -ERANGE; | |
459 | ||
460 | dout(" get_auth_session_key\n"); | |
461 | head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); | |
462 | ||
463 | /* encrypt and hash */ | |
464 | get_random_bytes(&auth->client_challenge, sizeof(u64)); | |
d03857c6 ID |
465 | blob->client_challenge = auth->client_challenge; |
466 | blob->server_challenge = cpu_to_le64(xi->server_challenge); | |
467 | ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN, | |
468 | sizeof(*blob)); | |
ec0994e4 SW |
469 | if (ret < 0) |
470 | return ret; | |
471 | ||
472 | auth->struct_v = 1; | |
473 | auth->key = 0; | |
d03857c6 | 474 | for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++) |
cd84db6e | 475 | auth->key ^= *(__le64 *)u; |
ec0994e4 SW |
476 | dout(" server_challenge %llx client_challenge %llx key %llx\n", |
477 | xi->server_challenge, le64_to_cpu(auth->client_challenge), | |
478 | le64_to_cpu(auth->key)); | |
479 | ||
480 | /* now encode the old ticket if exists */ | |
481 | ret = ceph_x_encode_ticket(th, &p, end); | |
482 | if (ret < 0) | |
483 | return ret; | |
484 | ||
485 | return p - buf; | |
486 | } | |
487 | ||
488 | if (need) { | |
489 | void *p = head + 1; | |
490 | struct ceph_x_service_ticket_request *req; | |
491 | ||
492 | if (p > end) | |
493 | return -ERANGE; | |
494 | head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY); | |
495 | ||
ec0994e4 SW |
496 | ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); |
497 | if (ret) | |
498 | return ret; | |
499 | ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base, | |
500 | xi->auth_authorizer.buf->vec.iov_len); | |
501 | ||
502 | req = p; | |
503 | req->keys = cpu_to_le32(need); | |
504 | p += sizeof(*req); | |
505 | return p - buf; | |
506 | } | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result, | |
512 | void *buf, void *end) | |
513 | { | |
514 | struct ceph_x_info *xi = ac->private; | |
515 | struct ceph_x_reply_header *head = buf; | |
516 | struct ceph_x_ticket_handler *th; | |
517 | int len = end - buf; | |
518 | int op; | |
519 | int ret; | |
520 | ||
521 | if (result) | |
522 | return result; /* XXX hmm? */ | |
523 | ||
524 | if (xi->starting) { | |
525 | /* it's a hello */ | |
526 | struct ceph_x_server_challenge *sc = buf; | |
527 | ||
528 | if (len != sizeof(*sc)) | |
529 | return -EINVAL; | |
530 | xi->server_challenge = le64_to_cpu(sc->server_challenge); | |
531 | dout("handle_reply got server challenge %llx\n", | |
532 | xi->server_challenge); | |
533 | xi->starting = false; | |
534 | xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; | |
535 | return -EAGAIN; | |
536 | } | |
537 | ||
0cf5537b | 538 | op = le16_to_cpu(head->op); |
ec0994e4 SW |
539 | result = le32_to_cpu(head->result); |
540 | dout("handle_reply op %d result %d\n", op, result); | |
541 | switch (op) { | |
542 | case CEPHX_GET_AUTH_SESSION_KEY: | |
543 | /* verify auth key */ | |
544 | ret = ceph_x_proc_ticket_reply(ac, &xi->secret, | |
545 | buf + sizeof(*head), end); | |
546 | break; | |
547 | ||
548 | case CEPHX_GET_PRINCIPAL_SESSION_KEY: | |
549 | th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); | |
b545787d DC |
550 | if (IS_ERR(th)) |
551 | return PTR_ERR(th); | |
ec0994e4 SW |
552 | ret = ceph_x_proc_ticket_reply(ac, &th->session_key, |
553 | buf + sizeof(*head), end); | |
554 | break; | |
555 | ||
556 | default: | |
557 | return -EINVAL; | |
558 | } | |
559 | if (ret) | |
560 | return ret; | |
561 | if (ac->want_keys == xi->have_keys) | |
562 | return 0; | |
563 | return -EAGAIN; | |
564 | } | |
565 | ||
6c1ea260 ID |
566 | static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) |
567 | { | |
568 | struct ceph_x_authorizer *au = (void *)a; | |
569 | ||
570 | ceph_x_authorizer_cleanup(au); | |
571 | kfree(au); | |
572 | } | |
573 | ||
ec0994e4 SW |
574 | static int ceph_x_create_authorizer( |
575 | struct ceph_auth_client *ac, int peer_type, | |
74f1869f | 576 | struct ceph_auth_handshake *auth) |
ec0994e4 SW |
577 | { |
578 | struct ceph_x_authorizer *au; | |
579 | struct ceph_x_ticket_handler *th; | |
580 | int ret; | |
581 | ||
582 | th = get_ticket_handler(ac, peer_type); | |
583 | if (IS_ERR(th)) | |
584 | return PTR_ERR(th); | |
585 | ||
586 | au = kzalloc(sizeof(*au), GFP_NOFS); | |
587 | if (!au) | |
588 | return -ENOMEM; | |
589 | ||
6c1ea260 ID |
590 | au->base.destroy = ceph_x_destroy_authorizer; |
591 | ||
ec0994e4 SW |
592 | ret = ceph_x_build_authorizer(ac, th, au); |
593 | if (ret) { | |
594 | kfree(au); | |
595 | return ret; | |
596 | } | |
597 | ||
74f1869f AE |
598 | auth->authorizer = (struct ceph_authorizer *) au; |
599 | auth->authorizer_buf = au->buf->vec.iov_base; | |
600 | auth->authorizer_buf_len = au->buf->vec.iov_len; | |
7882a26d ID |
601 | auth->authorizer_reply_buf = au->enc_buf; |
602 | auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; | |
33d07337 YZ |
603 | auth->sign_message = ac->ops->sign_message; |
604 | auth->check_message_signature = ac->ops->check_message_signature; | |
74f1869f | 605 | |
ec0994e4 SW |
606 | return 0; |
607 | } | |
608 | ||
0bed9b5c SW |
609 | static int ceph_x_update_authorizer( |
610 | struct ceph_auth_client *ac, int peer_type, | |
611 | struct ceph_auth_handshake *auth) | |
612 | { | |
613 | struct ceph_x_authorizer *au; | |
614 | struct ceph_x_ticket_handler *th; | |
0bed9b5c SW |
615 | |
616 | th = get_ticket_handler(ac, peer_type); | |
617 | if (IS_ERR(th)) | |
618 | return PTR_ERR(th); | |
619 | ||
620 | au = (struct ceph_x_authorizer *)auth->authorizer; | |
621 | if (au->secret_id < th->secret_id) { | |
622 | dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", | |
623 | au->service, au->secret_id, th->secret_id); | |
624 | return ceph_x_build_authorizer(ac, th, au); | |
625 | } | |
626 | return 0; | |
627 | } | |
628 | ||
ec0994e4 | 629 | static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, |
0dde5848 | 630 | struct ceph_authorizer *a) |
ec0994e4 SW |
631 | { |
632 | struct ceph_x_authorizer *au = (void *)a; | |
7882a26d | 633 | void *p = au->enc_buf; |
e15fd0a1 ID |
634 | struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset(); |
635 | int ret; | |
ec0994e4 | 636 | |
e15fd0a1 | 637 | ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN); |
ec0994e4 SW |
638 | if (ret < 0) |
639 | return ret; | |
e15fd0a1 | 640 | if (ret != sizeof(*reply)) |
ec0994e4 SW |
641 | return -EPERM; |
642 | ||
e15fd0a1 | 643 | if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one)) |
ec0994e4 SW |
644 | ret = -EPERM; |
645 | else | |
646 | ret = 0; | |
647 | dout("verify_authorizer_reply nonce %llx got %llx ret %d\n", | |
e15fd0a1 | 648 | au->nonce, le64_to_cpu(reply->nonce_plus_one), ret); |
ec0994e4 SW |
649 | return ret; |
650 | } | |
651 | ||
ec0994e4 SW |
652 | static void ceph_x_reset(struct ceph_auth_client *ac) |
653 | { | |
654 | struct ceph_x_info *xi = ac->private; | |
655 | ||
656 | dout("reset\n"); | |
657 | xi->starting = true; | |
658 | xi->server_challenge = 0; | |
659 | } | |
660 | ||
661 | static void ceph_x_destroy(struct ceph_auth_client *ac) | |
662 | { | |
663 | struct ceph_x_info *xi = ac->private; | |
664 | struct rb_node *p; | |
665 | ||
666 | dout("ceph_x_destroy %p\n", ac); | |
667 | ceph_crypto_key_destroy(&xi->secret); | |
668 | ||
669 | while ((p = rb_first(&xi->ticket_handlers)) != NULL) { | |
670 | struct ceph_x_ticket_handler *th = | |
671 | rb_entry(p, struct ceph_x_ticket_handler, node); | |
672 | remove_ticket_handler(ac, th); | |
673 | } | |
674 | ||
cbf99a11 | 675 | ceph_x_authorizer_cleanup(&xi->auth_authorizer); |
22b1de06 | 676 | |
ec0994e4 SW |
677 | kfree(ac->private); |
678 | ac->private = NULL; | |
679 | } | |
680 | ||
187d131d | 681 | static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) |
ec0994e4 SW |
682 | { |
683 | struct ceph_x_ticket_handler *th; | |
684 | ||
685 | th = get_ticket_handler(ac, peer_type); | |
b545787d | 686 | if (!IS_ERR(th)) |
6abe097d | 687 | th->have_key = false; |
ec0994e4 SW |
688 | } |
689 | ||
187d131d ID |
690 | static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, |
691 | int peer_type) | |
692 | { | |
693 | /* | |
694 | * We are to invalidate a service ticket in the hopes of | |
695 | * getting a new, hopefully more valid, one. But, we won't get | |
696 | * it unless our AUTH ticket is good, so invalidate AUTH ticket | |
697 | * as well, just in case. | |
698 | */ | |
699 | invalidate_ticket(ac, peer_type); | |
700 | invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); | |
701 | } | |
702 | ||
4eb4517c ID |
703 | static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, |
704 | __le64 *psig) | |
33d07337 | 705 | { |
d03857c6 | 706 | void *enc_buf = au->enc_buf; |
4eb4517c ID |
707 | struct { |
708 | __le32 len; | |
709 | __le32 header_crc; | |
710 | __le32 front_crc; | |
711 | __le32 middle_crc; | |
712 | __le32 data_crc; | |
d03857c6 | 713 | } __packed *sigblock = enc_buf + ceph_x_encrypt_offset(); |
4eb4517c ID |
714 | int ret; |
715 | ||
d03857c6 ID |
716 | sigblock->len = cpu_to_le32(4*sizeof(u32)); |
717 | sigblock->header_crc = msg->hdr.crc; | |
718 | sigblock->front_crc = msg->footer.front_crc; | |
719 | sigblock->middle_crc = msg->footer.middle_crc; | |
720 | sigblock->data_crc = msg->footer.data_crc; | |
721 | ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN, | |
722 | sizeof(*sigblock)); | |
33d07337 YZ |
723 | if (ret < 0) |
724 | return ret; | |
4eb4517c | 725 | |
d03857c6 | 726 | *psig = *(__le64 *)(enc_buf + sizeof(u32)); |
33d07337 YZ |
727 | return 0; |
728 | } | |
729 | ||
730 | static int ceph_x_sign_message(struct ceph_auth_handshake *auth, | |
731 | struct ceph_msg *msg) | |
732 | { | |
4eb4517c | 733 | __le64 sig; |
33d07337 | 734 | int ret; |
4199b8ee | 735 | |
a51983e4 ID |
736 | if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) |
737 | return 0; | |
738 | ||
4eb4517c ID |
739 | ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, |
740 | msg, &sig); | |
741 | if (ret) | |
33d07337 | 742 | return ret; |
4eb4517c ID |
743 | |
744 | msg->footer.sig = sig; | |
33d07337 YZ |
745 | msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; |
746 | return 0; | |
747 | } | |
748 | ||
749 | static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, | |
750 | struct ceph_msg *msg) | |
751 | { | |
752 | __le64 sig_check; | |
753 | int ret; | |
754 | ||
a51983e4 ID |
755 | if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) |
756 | return 0; | |
757 | ||
4eb4517c ID |
758 | ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, |
759 | msg, &sig_check); | |
760 | if (ret) | |
33d07337 YZ |
761 | return ret; |
762 | if (sig_check == msg->footer.sig) | |
763 | return 0; | |
764 | if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) | |
765 | dout("ceph_x_check_message_signature %p has signature %llx " | |
766 | "expect %llx\n", msg, msg->footer.sig, sig_check); | |
767 | else | |
768 | dout("ceph_x_check_message_signature %p sender did not set " | |
769 | "CEPH_MSG_FOOTER_SIGNED\n", msg); | |
770 | return -EBADMSG; | |
771 | } | |
ec0994e4 SW |
772 | |
773 | static const struct ceph_auth_client_ops ceph_x_ops = { | |
559c1e00 | 774 | .name = "x", |
ec0994e4 | 775 | .is_authenticated = ceph_x_is_authenticated, |
a41359fa | 776 | .should_authenticate = ceph_x_should_authenticate, |
ec0994e4 SW |
777 | .build_request = ceph_x_build_request, |
778 | .handle_reply = ceph_x_handle_reply, | |
779 | .create_authorizer = ceph_x_create_authorizer, | |
0bed9b5c | 780 | .update_authorizer = ceph_x_update_authorizer, |
ec0994e4 | 781 | .verify_authorizer_reply = ceph_x_verify_authorizer_reply, |
ec0994e4 SW |
782 | .invalidate_authorizer = ceph_x_invalidate_authorizer, |
783 | .reset = ceph_x_reset, | |
784 | .destroy = ceph_x_destroy, | |
33d07337 YZ |
785 | .sign_message = ceph_x_sign_message, |
786 | .check_message_signature = ceph_x_check_message_signature, | |
ec0994e4 SW |
787 | }; |
788 | ||
789 | ||
790 | int ceph_x_init(struct ceph_auth_client *ac) | |
791 | { | |
792 | struct ceph_x_info *xi; | |
793 | int ret; | |
794 | ||
795 | dout("ceph_x_init %p\n", ac); | |
b0930f8d | 796 | ret = -ENOMEM; |
ec0994e4 SW |
797 | xi = kzalloc(sizeof(*xi), GFP_NOFS); |
798 | if (!xi) | |
b0930f8d | 799 | goto out; |
ec0994e4 | 800 | |
ec0994e4 | 801 | ret = -EINVAL; |
8323c3aa | 802 | if (!ac->key) { |
ec0994e4 | 803 | pr_err("no secret set (for auth_x protocol)\n"); |
b0930f8d | 804 | goto out_nomem; |
ec0994e4 SW |
805 | } |
806 | ||
8323c3aa TV |
807 | ret = ceph_crypto_key_clone(&xi->secret, ac->key); |
808 | if (ret < 0) { | |
809 | pr_err("cannot clone key: %d\n", ret); | |
b0930f8d | 810 | goto out_nomem; |
8323c3aa | 811 | } |
ec0994e4 SW |
812 | |
813 | xi->starting = true; | |
814 | xi->ticket_handlers = RB_ROOT; | |
815 | ||
816 | ac->protocol = CEPH_AUTH_CEPHX; | |
817 | ac->private = xi; | |
818 | ac->ops = &ceph_x_ops; | |
819 | return 0; | |
820 | ||
b0930f8d | 821 | out_nomem: |
ec0994e4 | 822 | kfree(xi); |
b0930f8d | 823 | out: |
ec0994e4 SW |
824 | return ret; |
825 | } | |
826 | ||
827 |