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> | |
cc255c76 | 12 | #include <linux/ceph/ceph_features.h> |
a51983e4 | 13 | #include <linux/ceph/libceph.h> |
33d07337 | 14 | #include <linux/ceph/messenger.h> |
3d14c5d2 YS |
15 | |
16 | #include "crypto.h" | |
ec0994e4 SW |
17 | #include "auth_x.h" |
18 | #include "auth_x_protocol.h" | |
ec0994e4 | 19 | |
ec0994e4 SW |
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 need; | |
26 | ||
27 | ceph_x_validate_tickets(ac, &need); | |
28 | dout("ceph_x_is_authenticated want=%d need=%d have=%d\n", | |
29 | ac->want_keys, need, xi->have_keys); | |
30 | return (ac->want_keys & xi->have_keys) == ac->want_keys; | |
31 | } | |
32 | ||
a41359fa SW |
33 | static int ceph_x_should_authenticate(struct ceph_auth_client *ac) |
34 | { | |
35 | struct ceph_x_info *xi = ac->private; | |
36 | int need; | |
37 | ||
38 | ceph_x_validate_tickets(ac, &need); | |
39 | dout("ceph_x_should_authenticate want=%d need=%d have=%d\n", | |
40 | ac->want_keys, need, xi->have_keys); | |
41 | return need != 0; | |
42 | } | |
43 | ||
55d9cc83 ID |
44 | static int ceph_x_encrypt_offset(void) |
45 | { | |
46 | return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); | |
47 | } | |
48 | ||
807c86e2 SW |
49 | static int ceph_x_encrypt_buflen(int ilen) |
50 | { | |
55d9cc83 | 51 | return ceph_x_encrypt_offset() + ilen + 16; |
807c86e2 SW |
52 | } |
53 | ||
d03857c6 ID |
54 | static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf, |
55 | int buf_len, int plaintext_len) | |
ec0994e4 | 56 | { |
d03857c6 ID |
57 | struct ceph_x_encrypt_header *hdr = buf + sizeof(u32); |
58 | int ciphertext_len; | |
ec0994e4 SW |
59 | int ret; |
60 | ||
d03857c6 ID |
61 | hdr->struct_v = 1; |
62 | hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC); | |
63 | ||
64 | ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32), | |
65 | plaintext_len + sizeof(struct ceph_x_encrypt_header), | |
66 | &ciphertext_len); | |
ec0994e4 SW |
67 | if (ret) |
68 | return ret; | |
d03857c6 ID |
69 | |
70 | ceph_encode_32(&buf, ciphertext_len); | |
71 | return sizeof(u32) + ciphertext_len; | |
ec0994e4 SW |
72 | } |
73 | ||
c571fe24 ID |
74 | static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p, |
75 | int ciphertext_len) | |
76 | { | |
77 | struct ceph_x_encrypt_header *hdr = p; | |
78 | int plaintext_len; | |
79 | int ret; | |
80 | ||
81 | ret = ceph_crypt(secret, false, p, ciphertext_len, ciphertext_len, | |
82 | &plaintext_len); | |
83 | if (ret) | |
84 | return ret; | |
85 | ||
86 | if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) { | |
87 | pr_err("%s bad magic\n", __func__); | |
88 | return -EINVAL; | |
89 | } | |
90 | ||
91 | return plaintext_len - sizeof(*hdr); | |
92 | } | |
93 | ||
e15fd0a1 | 94 | static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end) |
ec0994e4 | 95 | { |
c571fe24 | 96 | int ciphertext_len; |
e15fd0a1 | 97 | int ret; |
ec0994e4 | 98 | |
e15fd0a1 ID |
99 | ceph_decode_32_safe(p, end, ciphertext_len, e_inval); |
100 | ceph_decode_need(p, end, ciphertext_len, e_inval); | |
c27a3e4d | 101 | |
c571fe24 ID |
102 | ret = __ceph_x_decrypt(secret, *p, ciphertext_len); |
103 | if (ret < 0) | |
ec0994e4 | 104 | return ret; |
e15fd0a1 | 105 | |
e15fd0a1 | 106 | *p += ciphertext_len; |
c571fe24 | 107 | return ret; |
e15fd0a1 ID |
108 | |
109 | e_inval: | |
110 | return -EINVAL; | |
ec0994e4 SW |
111 | } |
112 | ||
113 | /* | |
114 | * get existing (or insert new) ticket handler | |
115 | */ | |
cd84db6e YS |
116 | static struct ceph_x_ticket_handler * |
117 | get_ticket_handler(struct ceph_auth_client *ac, int service) | |
ec0994e4 SW |
118 | { |
119 | struct ceph_x_ticket_handler *th; | |
120 | struct ceph_x_info *xi = ac->private; | |
121 | struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; | |
122 | ||
123 | while (*p) { | |
124 | parent = *p; | |
125 | th = rb_entry(parent, struct ceph_x_ticket_handler, node); | |
126 | if (service < th->service) | |
127 | p = &(*p)->rb_left; | |
128 | else if (service > th->service) | |
129 | p = &(*p)->rb_right; | |
130 | else | |
131 | return th; | |
132 | } | |
133 | ||
134 | /* add it */ | |
135 | th = kzalloc(sizeof(*th), GFP_NOFS); | |
136 | if (!th) | |
137 | return ERR_PTR(-ENOMEM); | |
138 | th->service = service; | |
139 | rb_link_node(&th->node, parent, p); | |
140 | rb_insert_color(&th->node, &xi->ticket_handlers); | |
141 | return th; | |
142 | } | |
143 | ||
144 | static void remove_ticket_handler(struct ceph_auth_client *ac, | |
145 | struct ceph_x_ticket_handler *th) | |
146 | { | |
147 | struct ceph_x_info *xi = ac->private; | |
148 | ||
149 | dout("remove_ticket_handler %p %d\n", th, th->service); | |
150 | rb_erase(&th->node, &xi->ticket_handlers); | |
151 | ceph_crypto_key_destroy(&th->session_key); | |
152 | if (th->ticket_blob) | |
153 | ceph_buffer_put(th->ticket_blob); | |
154 | kfree(th); | |
155 | } | |
156 | ||
597cda35 ID |
157 | static int process_one_ticket(struct ceph_auth_client *ac, |
158 | struct ceph_crypto_key *secret, | |
c27a3e4d | 159 | void **p, void *end) |
597cda35 ID |
160 | { |
161 | struct ceph_x_info *xi = ac->private; | |
162 | int type; | |
163 | u8 tkt_struct_v, blob_struct_v; | |
164 | struct ceph_x_ticket_handler *th; | |
165 | void *dp, *dend; | |
166 | int dlen; | |
167 | char is_enc; | |
473bd2d7 | 168 | struct timespec64 validity; |
597cda35 | 169 | void *tp, *tpend; |
e9226d7c | 170 | void **ptp; |
b51456a6 | 171 | struct ceph_crypto_key new_session_key = { 0 }; |
597cda35 | 172 | struct ceph_buffer *new_ticket_blob; |
473bd2d7 | 173 | time64_t new_expires, new_renew_after; |
597cda35 ID |
174 | u64 new_secret_id; |
175 | int ret; | |
176 | ||
177 | ceph_decode_need(p, end, sizeof(u32) + 1, bad); | |
178 | ||
179 | type = ceph_decode_32(p); | |
180 | dout(" ticket type %d %s\n", type, ceph_entity_type_name(type)); | |
181 | ||
182 | tkt_struct_v = ceph_decode_8(p); | |
183 | if (tkt_struct_v != 1) | |
184 | goto bad; | |
185 | ||
186 | th = get_ticket_handler(ac, type); | |
187 | if (IS_ERR(th)) { | |
188 | ret = PTR_ERR(th); | |
189 | goto out; | |
190 | } | |
191 | ||
192 | /* blob for me */ | |
e15fd0a1 ID |
193 | dp = *p + ceph_x_encrypt_offset(); |
194 | ret = ceph_x_decrypt(secret, p, end); | |
195 | if (ret < 0) | |
597cda35 | 196 | goto out; |
e15fd0a1 ID |
197 | dout(" decrypted %d bytes\n", ret); |
198 | dend = dp + ret; | |
597cda35 ID |
199 | |
200 | tkt_struct_v = ceph_decode_8(&dp); | |
201 | if (tkt_struct_v != 1) | |
202 | goto bad; | |
203 | ||
597cda35 ID |
204 | ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); |
205 | if (ret) | |
206 | goto out; | |
207 | ||
473bd2d7 | 208 | ceph_decode_timespec64(&validity, dp); |
f6cdb292 | 209 | dp += sizeof(struct ceph_timespec); |
473bd2d7 | 210 | new_expires = ktime_get_real_seconds() + validity.tv_sec; |
597cda35 | 211 | new_renew_after = new_expires - (validity.tv_sec / 4); |
473bd2d7 | 212 | dout(" expires=%llu renew_after=%llu\n", new_expires, |
597cda35 ID |
213 | new_renew_after); |
214 | ||
215 | /* ticket blob for service */ | |
216 | ceph_decode_8_safe(p, end, is_enc, bad); | |
597cda35 ID |
217 | if (is_enc) { |
218 | /* encrypted */ | |
e15fd0a1 ID |
219 | tp = *p + ceph_x_encrypt_offset(); |
220 | ret = ceph_x_decrypt(&th->session_key, p, end); | |
221 | if (ret < 0) | |
597cda35 | 222 | goto out; |
e15fd0a1 | 223 | dout(" encrypted ticket, decrypted %d bytes\n", ret); |
e9226d7c | 224 | ptp = &tp; |
e15fd0a1 | 225 | tpend = tp + ret; |
597cda35 ID |
226 | } else { |
227 | /* unencrypted */ | |
e9226d7c ID |
228 | ptp = p; |
229 | tpend = end; | |
597cda35 | 230 | } |
e9226d7c | 231 | ceph_decode_32_safe(ptp, tpend, dlen, bad); |
597cda35 | 232 | dout(" ticket blob is %d bytes\n", dlen); |
e9226d7c ID |
233 | ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); |
234 | blob_struct_v = ceph_decode_8(ptp); | |
d18a1247 ID |
235 | if (blob_struct_v != 1) |
236 | goto bad; | |
237 | ||
e9226d7c ID |
238 | new_secret_id = ceph_decode_64(ptp); |
239 | ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); | |
597cda35 ID |
240 | if (ret) |
241 | goto out; | |
242 | ||
243 | /* all is well, update our ticket */ | |
244 | ceph_crypto_key_destroy(&th->session_key); | |
245 | if (th->ticket_blob) | |
246 | ceph_buffer_put(th->ticket_blob); | |
247 | th->session_key = new_session_key; | |
248 | th->ticket_blob = new_ticket_blob; | |
597cda35 ID |
249 | th->secret_id = new_secret_id; |
250 | th->expires = new_expires; | |
251 | th->renew_after = new_renew_after; | |
6abe097d | 252 | th->have_key = true; |
597cda35 ID |
253 | dout(" got ticket service %d (%s) secret_id %lld len %d\n", |
254 | type, ceph_entity_type_name(type), th->secret_id, | |
255 | (int)th->ticket_blob->vec.iov_len); | |
256 | xi->have_keys |= th->service; | |
b51456a6 | 257 | return 0; |
597cda35 ID |
258 | |
259 | bad: | |
260 | ret = -EINVAL; | |
b51456a6 ID |
261 | out: |
262 | ceph_crypto_key_destroy(&new_session_key); | |
263 | return ret; | |
597cda35 ID |
264 | } |
265 | ||
ec0994e4 SW |
266 | static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, |
267 | struct ceph_crypto_key *secret, | |
268 | void *buf, void *end) | |
269 | { | |
ec0994e4 | 270 | void *p = buf; |
b736b3d9 | 271 | u8 reply_struct_v; |
597cda35 ID |
272 | u32 num; |
273 | int ret; | |
ec0994e4 | 274 | |
597cda35 | 275 | ceph_decode_8_safe(&p, end, reply_struct_v, bad); |
b736b3d9 | 276 | if (reply_struct_v != 1) |
597cda35 | 277 | return -EINVAL; |
ec0994e4 | 278 | |
597cda35 ID |
279 | ceph_decode_32_safe(&p, end, num, bad); |
280 | dout("%d tickets\n", num); | |
ec0994e4 | 281 | |
597cda35 | 282 | while (num--) { |
c27a3e4d | 283 | ret = process_one_ticket(ac, secret, &p, end); |
ec0994e4 | 284 | if (ret) |
c27a3e4d | 285 | return ret; |
ec0994e4 SW |
286 | } |
287 | ||
c27a3e4d | 288 | return 0; |
ec0994e4 SW |
289 | |
290 | bad: | |
c27a3e4d | 291 | return -EINVAL; |
ec0994e4 SW |
292 | } |
293 | ||
149cac4a ID |
294 | /* |
295 | * Encode and encrypt the second part (ceph_x_authorize_b) of the | |
296 | * authorizer. The first part (ceph_x_authorize_a) should already be | |
297 | * encoded. | |
298 | */ | |
6daca13d ID |
299 | static int encrypt_authorizer(struct ceph_x_authorizer *au, |
300 | u64 *server_challenge) | |
149cac4a ID |
301 | { |
302 | struct ceph_x_authorize_a *msg_a; | |
303 | struct ceph_x_authorize_b *msg_b; | |
304 | void *p, *end; | |
305 | int ret; | |
306 | ||
307 | msg_a = au->buf->vec.iov_base; | |
308 | WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id)); | |
309 | p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len); | |
310 | end = au->buf->vec.iov_base + au->buf->vec.iov_len; | |
311 | ||
312 | msg_b = p + ceph_x_encrypt_offset(); | |
6daca13d | 313 | msg_b->struct_v = 2; |
149cac4a | 314 | msg_b->nonce = cpu_to_le64(au->nonce); |
6daca13d ID |
315 | if (server_challenge) { |
316 | msg_b->have_challenge = 1; | |
317 | msg_b->server_challenge_plus_one = | |
318 | cpu_to_le64(*server_challenge + 1); | |
319 | } else { | |
320 | msg_b->have_challenge = 0; | |
321 | msg_b->server_challenge_plus_one = 0; | |
322 | } | |
149cac4a ID |
323 | |
324 | ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b)); | |
325 | if (ret < 0) | |
326 | return ret; | |
327 | ||
328 | p += ret; | |
6daca13d ID |
329 | if (server_challenge) { |
330 | WARN_ON(p != end); | |
331 | } else { | |
332 | WARN_ON(p > end); | |
333 | au->buf->vec.iov_len = p - au->buf->vec.iov_base; | |
334 | } | |
149cac4a ID |
335 | |
336 | return 0; | |
337 | } | |
338 | ||
cbf99a11 ID |
339 | static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) |
340 | { | |
341 | ceph_crypto_key_destroy(&au->session_key); | |
342 | if (au->buf) { | |
343 | ceph_buffer_put(au->buf); | |
344 | au->buf = NULL; | |
345 | } | |
346 | } | |
347 | ||
ec0994e4 SW |
348 | static int ceph_x_build_authorizer(struct ceph_auth_client *ac, |
349 | struct ceph_x_ticket_handler *th, | |
350 | struct ceph_x_authorizer *au) | |
351 | { | |
807c86e2 | 352 | int maxlen; |
ec0994e4 | 353 | struct ceph_x_authorize_a *msg_a; |
d03857c6 | 354 | struct ceph_x_authorize_b *msg_b; |
ec0994e4 SW |
355 | int ret; |
356 | int ticket_blob_len = | |
357 | (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); | |
358 | ||
359 | dout("build_authorizer for %s %p\n", | |
360 | ceph_entity_type_name(th->service), au); | |
361 | ||
ae385eaf YZ |
362 | ceph_crypto_key_destroy(&au->session_key); |
363 | ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); | |
364 | if (ret) | |
cbf99a11 | 365 | goto out_au; |
ae385eaf | 366 | |
36721ece | 367 | maxlen = sizeof(*msg_a) + ticket_blob_len + |
d03857c6 | 368 | ceph_x_encrypt_buflen(sizeof(*msg_b)); |
807c86e2 SW |
369 | dout(" need len %d\n", maxlen); |
370 | if (au->buf && au->buf->alloc_len < maxlen) { | |
ec0994e4 SW |
371 | ceph_buffer_put(au->buf); |
372 | au->buf = NULL; | |
373 | } | |
374 | if (!au->buf) { | |
807c86e2 | 375 | au->buf = ceph_buffer_new(maxlen, GFP_NOFS); |
ae385eaf | 376 | if (!au->buf) { |
cbf99a11 ID |
377 | ret = -ENOMEM; |
378 | goto out_au; | |
ae385eaf | 379 | } |
ec0994e4 SW |
380 | } |
381 | au->service = th->service; | |
0bed9b5c | 382 | au->secret_id = th->secret_id; |
ec0994e4 SW |
383 | |
384 | msg_a = au->buf->vec.iov_base; | |
385 | msg_a->struct_v = 1; | |
386 | msg_a->global_id = cpu_to_le64(ac->global_id); | |
387 | msg_a->service_id = cpu_to_le32(th->service); | |
388 | msg_a->ticket_blob.struct_v = 1; | |
389 | msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); | |
390 | msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); | |
391 | if (ticket_blob_len) { | |
392 | memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, | |
393 | th->ticket_blob->vec.iov_len); | |
394 | } | |
395 | dout(" th %p secret_id %lld %lld\n", th, th->secret_id, | |
396 | le64_to_cpu(msg_a->ticket_blob.secret_id)); | |
397 | ||
ec0994e4 | 398 | get_random_bytes(&au->nonce, sizeof(au->nonce)); |
6daca13d | 399 | ret = encrypt_authorizer(au, NULL); |
149cac4a ID |
400 | if (ret) { |
401 | pr_err("failed to encrypt authorizer: %d", ret); | |
cbf99a11 | 402 | goto out_au; |
149cac4a | 403 | } |
36721ece | 404 | |
ec0994e4 SW |
405 | dout(" built authorizer nonce %llx len %d\n", au->nonce, |
406 | (int)au->buf->vec.iov_len); | |
407 | return 0; | |
408 | ||
cbf99a11 ID |
409 | out_au: |
410 | ceph_x_authorizer_cleanup(au); | |
ec0994e4 SW |
411 | return ret; |
412 | } | |
413 | ||
414 | static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, | |
415 | void **p, void *end) | |
416 | { | |
417 | ceph_decode_need(p, end, 1 + sizeof(u64), bad); | |
418 | ceph_encode_8(p, 1); | |
419 | ceph_encode_64(p, th->secret_id); | |
420 | if (th->ticket_blob) { | |
421 | const char *buf = th->ticket_blob->vec.iov_base; | |
422 | u32 len = th->ticket_blob->vec.iov_len; | |
423 | ||
424 | ceph_encode_32_safe(p, end, len, bad); | |
425 | ceph_encode_copy_safe(p, end, buf, len, bad); | |
426 | } else { | |
427 | ceph_encode_32_safe(p, end, 0, bad); | |
428 | } | |
429 | ||
430 | return 0; | |
431 | bad: | |
432 | return -ERANGE; | |
433 | } | |
434 | ||
6abe097d ID |
435 | static bool need_key(struct ceph_x_ticket_handler *th) |
436 | { | |
437 | if (!th->have_key) | |
438 | return true; | |
439 | ||
473bd2d7 | 440 | return ktime_get_real_seconds() >= th->renew_after; |
6abe097d ID |
441 | } |
442 | ||
443 | static bool have_key(struct ceph_x_ticket_handler *th) | |
444 | { | |
445 | if (th->have_key) { | |
473bd2d7 | 446 | if (ktime_get_real_seconds() >= th->expires) |
6abe097d ID |
447 | th->have_key = false; |
448 | } | |
449 | ||
450 | return th->have_key; | |
451 | } | |
452 | ||
ec0994e4 SW |
453 | static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) |
454 | { | |
455 | int want = ac->want_keys; | |
456 | struct ceph_x_info *xi = ac->private; | |
457 | int service; | |
458 | ||
459 | *pneed = ac->want_keys & ~(xi->have_keys); | |
460 | ||
461 | for (service = 1; service <= want; service <<= 1) { | |
462 | struct ceph_x_ticket_handler *th; | |
463 | ||
464 | if (!(ac->want_keys & service)) | |
465 | continue; | |
466 | ||
467 | if (*pneed & service) | |
468 | continue; | |
469 | ||
470 | th = get_ticket_handler(ac, service); | |
b545787d | 471 | if (IS_ERR(th)) { |
ec0994e4 SW |
472 | *pneed |= service; |
473 | continue; | |
474 | } | |
475 | ||
6abe097d | 476 | if (need_key(th)) |
ec0994e4 | 477 | *pneed |= service; |
6abe097d | 478 | if (!have_key(th)) |
ec0994e4 SW |
479 | xi->have_keys &= ~service; |
480 | } | |
481 | } | |
482 | ||
ec0994e4 SW |
483 | static int ceph_x_build_request(struct ceph_auth_client *ac, |
484 | void *buf, void *end) | |
485 | { | |
486 | struct ceph_x_info *xi = ac->private; | |
487 | int need; | |
488 | struct ceph_x_request_header *head = buf; | |
489 | int ret; | |
490 | struct ceph_x_ticket_handler *th = | |
491 | get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); | |
492 | ||
b545787d DC |
493 | if (IS_ERR(th)) |
494 | return PTR_ERR(th); | |
495 | ||
ec0994e4 SW |
496 | ceph_x_validate_tickets(ac, &need); |
497 | ||
498 | dout("build_request want %x have %x need %x\n", | |
499 | ac->want_keys, xi->have_keys, need); | |
500 | ||
501 | if (need & CEPH_ENTITY_TYPE_AUTH) { | |
502 | struct ceph_x_authenticate *auth = (void *)(head + 1); | |
503 | void *p = auth + 1; | |
d03857c6 ID |
504 | void *enc_buf = xi->auth_authorizer.enc_buf; |
505 | struct ceph_x_challenge_blob *blob = enc_buf + | |
506 | ceph_x_encrypt_offset(); | |
ec0994e4 SW |
507 | u64 *u; |
508 | ||
509 | if (p > end) | |
510 | return -ERANGE; | |
511 | ||
512 | dout(" get_auth_session_key\n"); | |
513 | head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); | |
514 | ||
515 | /* encrypt and hash */ | |
516 | get_random_bytes(&auth->client_challenge, sizeof(u64)); | |
d03857c6 ID |
517 | blob->client_challenge = auth->client_challenge; |
518 | blob->server_challenge = cpu_to_le64(xi->server_challenge); | |
519 | ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN, | |
520 | sizeof(*blob)); | |
ec0994e4 SW |
521 | if (ret < 0) |
522 | return ret; | |
523 | ||
524 | auth->struct_v = 1; | |
525 | auth->key = 0; | |
d03857c6 | 526 | for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++) |
cd84db6e | 527 | auth->key ^= *(__le64 *)u; |
ec0994e4 SW |
528 | dout(" server_challenge %llx client_challenge %llx key %llx\n", |
529 | xi->server_challenge, le64_to_cpu(auth->client_challenge), | |
530 | le64_to_cpu(auth->key)); | |
531 | ||
532 | /* now encode the old ticket if exists */ | |
533 | ret = ceph_x_encode_ticket(th, &p, end); | |
534 | if (ret < 0) | |
535 | return ret; | |
536 | ||
537 | return p - buf; | |
538 | } | |
539 | ||
540 | if (need) { | |
541 | void *p = head + 1; | |
542 | struct ceph_x_service_ticket_request *req; | |
543 | ||
544 | if (p > end) | |
545 | return -ERANGE; | |
546 | head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY); | |
547 | ||
ec0994e4 SW |
548 | ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); |
549 | if (ret) | |
550 | return ret; | |
551 | ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base, | |
552 | xi->auth_authorizer.buf->vec.iov_len); | |
553 | ||
554 | req = p; | |
555 | req->keys = cpu_to_le32(need); | |
556 | p += sizeof(*req); | |
557 | return p - buf; | |
558 | } | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result, | |
564 | void *buf, void *end) | |
565 | { | |
566 | struct ceph_x_info *xi = ac->private; | |
567 | struct ceph_x_reply_header *head = buf; | |
568 | struct ceph_x_ticket_handler *th; | |
569 | int len = end - buf; | |
570 | int op; | |
571 | int ret; | |
572 | ||
573 | if (result) | |
574 | return result; /* XXX hmm? */ | |
575 | ||
576 | if (xi->starting) { | |
577 | /* it's a hello */ | |
578 | struct ceph_x_server_challenge *sc = buf; | |
579 | ||
580 | if (len != sizeof(*sc)) | |
581 | return -EINVAL; | |
582 | xi->server_challenge = le64_to_cpu(sc->server_challenge); | |
583 | dout("handle_reply got server challenge %llx\n", | |
584 | xi->server_challenge); | |
585 | xi->starting = false; | |
586 | xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; | |
587 | return -EAGAIN; | |
588 | } | |
589 | ||
0cf5537b | 590 | op = le16_to_cpu(head->op); |
ec0994e4 SW |
591 | result = le32_to_cpu(head->result); |
592 | dout("handle_reply op %d result %d\n", op, result); | |
593 | switch (op) { | |
594 | case CEPHX_GET_AUTH_SESSION_KEY: | |
595 | /* verify auth key */ | |
596 | ret = ceph_x_proc_ticket_reply(ac, &xi->secret, | |
597 | buf + sizeof(*head), end); | |
598 | break; | |
599 | ||
600 | case CEPHX_GET_PRINCIPAL_SESSION_KEY: | |
601 | th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); | |
b545787d DC |
602 | if (IS_ERR(th)) |
603 | return PTR_ERR(th); | |
ec0994e4 SW |
604 | ret = ceph_x_proc_ticket_reply(ac, &th->session_key, |
605 | buf + sizeof(*head), end); | |
606 | break; | |
607 | ||
608 | default: | |
609 | return -EINVAL; | |
610 | } | |
611 | if (ret) | |
612 | return ret; | |
613 | if (ac->want_keys == xi->have_keys) | |
614 | return 0; | |
615 | return -EAGAIN; | |
616 | } | |
617 | ||
6c1ea260 ID |
618 | static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) |
619 | { | |
620 | struct ceph_x_authorizer *au = (void *)a; | |
621 | ||
622 | ceph_x_authorizer_cleanup(au); | |
623 | kfree(au); | |
624 | } | |
625 | ||
ec0994e4 SW |
626 | static int ceph_x_create_authorizer( |
627 | struct ceph_auth_client *ac, int peer_type, | |
74f1869f | 628 | struct ceph_auth_handshake *auth) |
ec0994e4 SW |
629 | { |
630 | struct ceph_x_authorizer *au; | |
631 | struct ceph_x_ticket_handler *th; | |
632 | int ret; | |
633 | ||
634 | th = get_ticket_handler(ac, peer_type); | |
635 | if (IS_ERR(th)) | |
636 | return PTR_ERR(th); | |
637 | ||
638 | au = kzalloc(sizeof(*au), GFP_NOFS); | |
639 | if (!au) | |
640 | return -ENOMEM; | |
641 | ||
6c1ea260 ID |
642 | au->base.destroy = ceph_x_destroy_authorizer; |
643 | ||
ec0994e4 SW |
644 | ret = ceph_x_build_authorizer(ac, th, au); |
645 | if (ret) { | |
646 | kfree(au); | |
647 | return ret; | |
648 | } | |
649 | ||
74f1869f AE |
650 | auth->authorizer = (struct ceph_authorizer *) au; |
651 | auth->authorizer_buf = au->buf->vec.iov_base; | |
652 | auth->authorizer_buf_len = au->buf->vec.iov_len; | |
7882a26d ID |
653 | auth->authorizer_reply_buf = au->enc_buf; |
654 | auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; | |
33d07337 YZ |
655 | auth->sign_message = ac->ops->sign_message; |
656 | auth->check_message_signature = ac->ops->check_message_signature; | |
74f1869f | 657 | |
ec0994e4 SW |
658 | return 0; |
659 | } | |
660 | ||
0bed9b5c SW |
661 | static int ceph_x_update_authorizer( |
662 | struct ceph_auth_client *ac, int peer_type, | |
663 | struct ceph_auth_handshake *auth) | |
664 | { | |
665 | struct ceph_x_authorizer *au; | |
666 | struct ceph_x_ticket_handler *th; | |
0bed9b5c SW |
667 | |
668 | th = get_ticket_handler(ac, peer_type); | |
669 | if (IS_ERR(th)) | |
670 | return PTR_ERR(th); | |
671 | ||
672 | au = (struct ceph_x_authorizer *)auth->authorizer; | |
673 | if (au->secret_id < th->secret_id) { | |
674 | dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", | |
675 | au->service, au->secret_id, th->secret_id); | |
676 | return ceph_x_build_authorizer(ac, th, au); | |
677 | } | |
678 | return 0; | |
679 | } | |
680 | ||
6daca13d ID |
681 | static int decrypt_authorize_challenge(struct ceph_x_authorizer *au, |
682 | void *challenge_buf, | |
683 | int challenge_buf_len, | |
684 | u64 *server_challenge) | |
685 | { | |
686 | struct ceph_x_authorize_challenge *ch = | |
687 | challenge_buf + sizeof(struct ceph_x_encrypt_header); | |
688 | int ret; | |
689 | ||
690 | /* no leading len */ | |
691 | ret = __ceph_x_decrypt(&au->session_key, challenge_buf, | |
692 | challenge_buf_len); | |
693 | if (ret < 0) | |
694 | return ret; | |
695 | if (ret < sizeof(*ch)) { | |
696 | pr_err("bad size %d for ceph_x_authorize_challenge\n", ret); | |
697 | return -EINVAL; | |
698 | } | |
699 | ||
700 | *server_challenge = le64_to_cpu(ch->server_challenge); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac, | |
705 | struct ceph_authorizer *a, | |
706 | void *challenge_buf, | |
707 | int challenge_buf_len) | |
708 | { | |
709 | struct ceph_x_authorizer *au = (void *)a; | |
710 | u64 server_challenge; | |
711 | int ret; | |
712 | ||
713 | ret = decrypt_authorize_challenge(au, challenge_buf, challenge_buf_len, | |
714 | &server_challenge); | |
715 | if (ret) { | |
716 | pr_err("failed to decrypt authorize challenge: %d", ret); | |
717 | return ret; | |
718 | } | |
719 | ||
720 | ret = encrypt_authorizer(au, &server_challenge); | |
721 | if (ret) { | |
722 | pr_err("failed to encrypt authorizer w/ challenge: %d", ret); | |
723 | return ret; | |
724 | } | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
ec0994e4 | 729 | static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, |
0dde5848 | 730 | struct ceph_authorizer *a) |
ec0994e4 SW |
731 | { |
732 | struct ceph_x_authorizer *au = (void *)a; | |
7882a26d | 733 | void *p = au->enc_buf; |
e15fd0a1 ID |
734 | struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset(); |
735 | int ret; | |
ec0994e4 | 736 | |
e15fd0a1 | 737 | ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN); |
ec0994e4 SW |
738 | if (ret < 0) |
739 | return ret; | |
f1d10e04 ID |
740 | if (ret < sizeof(*reply)) { |
741 | pr_err("bad size %d for ceph_x_authorize_reply\n", ret); | |
742 | return -EINVAL; | |
743 | } | |
ec0994e4 | 744 | |
e15fd0a1 | 745 | if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one)) |
ec0994e4 SW |
746 | ret = -EPERM; |
747 | else | |
748 | ret = 0; | |
749 | dout("verify_authorizer_reply nonce %llx got %llx ret %d\n", | |
e15fd0a1 | 750 | au->nonce, le64_to_cpu(reply->nonce_plus_one), ret); |
ec0994e4 SW |
751 | return ret; |
752 | } | |
753 | ||
ec0994e4 SW |
754 | static void ceph_x_reset(struct ceph_auth_client *ac) |
755 | { | |
756 | struct ceph_x_info *xi = ac->private; | |
757 | ||
758 | dout("reset\n"); | |
759 | xi->starting = true; | |
760 | xi->server_challenge = 0; | |
761 | } | |
762 | ||
763 | static void ceph_x_destroy(struct ceph_auth_client *ac) | |
764 | { | |
765 | struct ceph_x_info *xi = ac->private; | |
766 | struct rb_node *p; | |
767 | ||
768 | dout("ceph_x_destroy %p\n", ac); | |
769 | ceph_crypto_key_destroy(&xi->secret); | |
770 | ||
771 | while ((p = rb_first(&xi->ticket_handlers)) != NULL) { | |
772 | struct ceph_x_ticket_handler *th = | |
773 | rb_entry(p, struct ceph_x_ticket_handler, node); | |
774 | remove_ticket_handler(ac, th); | |
775 | } | |
776 | ||
cbf99a11 | 777 | ceph_x_authorizer_cleanup(&xi->auth_authorizer); |
22b1de06 | 778 | |
ec0994e4 SW |
779 | kfree(ac->private); |
780 | ac->private = NULL; | |
781 | } | |
782 | ||
187d131d | 783 | static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) |
ec0994e4 SW |
784 | { |
785 | struct ceph_x_ticket_handler *th; | |
786 | ||
787 | th = get_ticket_handler(ac, peer_type); | |
b545787d | 788 | if (!IS_ERR(th)) |
6abe097d | 789 | th->have_key = false; |
ec0994e4 SW |
790 | } |
791 | ||
187d131d ID |
792 | static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, |
793 | int peer_type) | |
794 | { | |
795 | /* | |
796 | * We are to invalidate a service ticket in the hopes of | |
797 | * getting a new, hopefully more valid, one. But, we won't get | |
798 | * it unless our AUTH ticket is good, so invalidate AUTH ticket | |
799 | * as well, just in case. | |
800 | */ | |
801 | invalidate_ticket(ac, peer_type); | |
802 | invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); | |
803 | } | |
804 | ||
4eb4517c ID |
805 | static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, |
806 | __le64 *psig) | |
33d07337 | 807 | { |
d03857c6 | 808 | void *enc_buf = au->enc_buf; |
4eb4517c ID |
809 | int ret; |
810 | ||
cc255c76 ID |
811 | if (!CEPH_HAVE_FEATURE(msg->con->peer_features, CEPHX_V2)) { |
812 | struct { | |
813 | __le32 len; | |
814 | __le32 header_crc; | |
815 | __le32 front_crc; | |
816 | __le32 middle_crc; | |
817 | __le32 data_crc; | |
818 | } __packed *sigblock = enc_buf + ceph_x_encrypt_offset(); | |
819 | ||
820 | sigblock->len = cpu_to_le32(4*sizeof(u32)); | |
821 | sigblock->header_crc = msg->hdr.crc; | |
822 | sigblock->front_crc = msg->footer.front_crc; | |
823 | sigblock->middle_crc = msg->footer.middle_crc; | |
824 | sigblock->data_crc = msg->footer.data_crc; | |
825 | ||
826 | ret = ceph_x_encrypt(&au->session_key, enc_buf, | |
827 | CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock)); | |
828 | if (ret < 0) | |
829 | return ret; | |
830 | ||
831 | *psig = *(__le64 *)(enc_buf + sizeof(u32)); | |
832 | } else { | |
833 | struct { | |
834 | __le32 header_crc; | |
835 | __le32 front_crc; | |
836 | __le32 front_len; | |
837 | __le32 middle_crc; | |
838 | __le32 middle_len; | |
839 | __le32 data_crc; | |
840 | __le32 data_len; | |
841 | __le32 seq_lower_word; | |
842 | } __packed *sigblock = enc_buf; | |
843 | struct { | |
844 | __le64 a, b, c, d; | |
845 | } __packed *penc = enc_buf; | |
846 | int ciphertext_len; | |
847 | ||
848 | sigblock->header_crc = msg->hdr.crc; | |
849 | sigblock->front_crc = msg->footer.front_crc; | |
850 | sigblock->front_len = msg->hdr.front_len; | |
851 | sigblock->middle_crc = msg->footer.middle_crc; | |
852 | sigblock->middle_len = msg->hdr.middle_len; | |
853 | sigblock->data_crc = msg->footer.data_crc; | |
854 | sigblock->data_len = msg->hdr.data_len; | |
855 | sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq; | |
856 | ||
857 | /* no leading len, no ceph_x_encrypt_header */ | |
858 | ret = ceph_crypt(&au->session_key, true, enc_buf, | |
859 | CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock), | |
860 | &ciphertext_len); | |
861 | if (ret) | |
862 | return ret; | |
863 | ||
864 | *psig = penc->a ^ penc->b ^ penc->c ^ penc->d; | |
865 | } | |
4eb4517c | 866 | |
33d07337 YZ |
867 | return 0; |
868 | } | |
869 | ||
870 | static int ceph_x_sign_message(struct ceph_auth_handshake *auth, | |
871 | struct ceph_msg *msg) | |
872 | { | |
4eb4517c | 873 | __le64 sig; |
33d07337 | 874 | int ret; |
4199b8ee | 875 | |
a51983e4 ID |
876 | if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) |
877 | return 0; | |
878 | ||
4eb4517c ID |
879 | ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, |
880 | msg, &sig); | |
881 | if (ret) | |
33d07337 | 882 | return ret; |
4eb4517c ID |
883 | |
884 | msg->footer.sig = sig; | |
33d07337 YZ |
885 | msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; |
886 | return 0; | |
887 | } | |
888 | ||
889 | static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, | |
890 | struct ceph_msg *msg) | |
891 | { | |
892 | __le64 sig_check; | |
893 | int ret; | |
894 | ||
a51983e4 ID |
895 | if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) |
896 | return 0; | |
897 | ||
4eb4517c ID |
898 | ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, |
899 | msg, &sig_check); | |
900 | if (ret) | |
33d07337 YZ |
901 | return ret; |
902 | if (sig_check == msg->footer.sig) | |
903 | return 0; | |
904 | if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) | |
905 | dout("ceph_x_check_message_signature %p has signature %llx " | |
906 | "expect %llx\n", msg, msg->footer.sig, sig_check); | |
907 | else | |
908 | dout("ceph_x_check_message_signature %p sender did not set " | |
909 | "CEPH_MSG_FOOTER_SIGNED\n", msg); | |
910 | return -EBADMSG; | |
911 | } | |
ec0994e4 SW |
912 | |
913 | static const struct ceph_auth_client_ops ceph_x_ops = { | |
559c1e00 | 914 | .name = "x", |
ec0994e4 | 915 | .is_authenticated = ceph_x_is_authenticated, |
a41359fa | 916 | .should_authenticate = ceph_x_should_authenticate, |
ec0994e4 SW |
917 | .build_request = ceph_x_build_request, |
918 | .handle_reply = ceph_x_handle_reply, | |
919 | .create_authorizer = ceph_x_create_authorizer, | |
0bed9b5c | 920 | .update_authorizer = ceph_x_update_authorizer, |
6daca13d | 921 | .add_authorizer_challenge = ceph_x_add_authorizer_challenge, |
ec0994e4 | 922 | .verify_authorizer_reply = ceph_x_verify_authorizer_reply, |
ec0994e4 SW |
923 | .invalidate_authorizer = ceph_x_invalidate_authorizer, |
924 | .reset = ceph_x_reset, | |
925 | .destroy = ceph_x_destroy, | |
33d07337 YZ |
926 | .sign_message = ceph_x_sign_message, |
927 | .check_message_signature = ceph_x_check_message_signature, | |
ec0994e4 SW |
928 | }; |
929 | ||
930 | ||
931 | int ceph_x_init(struct ceph_auth_client *ac) | |
932 | { | |
933 | struct ceph_x_info *xi; | |
934 | int ret; | |
935 | ||
936 | dout("ceph_x_init %p\n", ac); | |
b0930f8d | 937 | ret = -ENOMEM; |
ec0994e4 SW |
938 | xi = kzalloc(sizeof(*xi), GFP_NOFS); |
939 | if (!xi) | |
b0930f8d | 940 | goto out; |
ec0994e4 | 941 | |
ec0994e4 | 942 | ret = -EINVAL; |
8323c3aa | 943 | if (!ac->key) { |
ec0994e4 | 944 | pr_err("no secret set (for auth_x protocol)\n"); |
b0930f8d | 945 | goto out_nomem; |
ec0994e4 SW |
946 | } |
947 | ||
8323c3aa TV |
948 | ret = ceph_crypto_key_clone(&xi->secret, ac->key); |
949 | if (ret < 0) { | |
950 | pr_err("cannot clone key: %d\n", ret); | |
b0930f8d | 951 | goto out_nomem; |
8323c3aa | 952 | } |
ec0994e4 SW |
953 | |
954 | xi->starting = true; | |
955 | xi->ticket_handlers = RB_ROOT; | |
956 | ||
957 | ac->protocol = CEPH_AUTH_CEPHX; | |
958 | ac->private = xi; | |
959 | ac->ops = &ceph_x_ops; | |
960 | return 0; | |
961 | ||
b0930f8d | 962 | out_nomem: |
ec0994e4 | 963 | kfree(xi); |
b0930f8d | 964 | out: |
ec0994e4 SW |
965 | return ret; |
966 | } |