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