[SCSI] mpt2sas: Send default descriptor for RAID pass through in mpt2ctl
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ceph / auth_x.c
blobd9001a4dc8ccd4816f0b3caf1ef60b7068c52121
2 #include "ceph_debug.h"
4 #include <linux/err.h>
5 #include <linux/module.h>
6 #include <linux/random.h>
7 #include <linux/slab.h>
9 #include "auth_x.h"
10 #include "auth_x_protocol.h"
11 #include "crypto.h"
12 #include "auth.h"
13 #include "decode.h"
15 struct kmem_cache *ceph_x_ticketbuf_cachep;
17 #define TEMP_TICKET_BUF_LEN 256
19 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
21 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
23 struct ceph_x_info *xi = ac->private;
24 int need;
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;
32 static int ceph_x_encrypt_buflen(int ilen)
34 return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
35 sizeof(u32);
38 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
39 void *ibuf, int ilen, void *obuf, size_t olen)
41 struct ceph_x_encrypt_header head = {
42 .struct_v = 1,
43 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
45 size_t len = olen - sizeof(u32);
46 int ret;
48 ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
49 &head, sizeof(head), ibuf, ilen);
50 if (ret)
51 return ret;
52 ceph_encode_32(&obuf, len);
53 return len + sizeof(u32);
56 static int ceph_x_decrypt(struct ceph_crypto_key *secret,
57 void **p, void *end, void *obuf, size_t olen)
59 struct ceph_x_encrypt_header head;
60 size_t head_len = sizeof(head);
61 int len, ret;
63 len = ceph_decode_32(p);
64 if (*p + len > end)
65 return -EINVAL;
67 dout("ceph_x_decrypt len %d\n", len);
68 ret = ceph_decrypt2(secret, &head, &head_len, obuf, &olen,
69 *p, len);
70 if (ret)
71 return ret;
72 if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
73 return -EPERM;
74 *p += len;
75 return olen;
79 * get existing (or insert new) ticket handler
81 struct ceph_x_ticket_handler *get_ticket_handler(struct ceph_auth_client *ac,
82 int service)
84 struct ceph_x_ticket_handler *th;
85 struct ceph_x_info *xi = ac->private;
86 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
88 while (*p) {
89 parent = *p;
90 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
91 if (service < th->service)
92 p = &(*p)->rb_left;
93 else if (service > th->service)
94 p = &(*p)->rb_right;
95 else
96 return th;
99 /* add it */
100 th = kzalloc(sizeof(*th), GFP_NOFS);
101 if (!th)
102 return ERR_PTR(-ENOMEM);
103 th->service = service;
104 rb_link_node(&th->node, parent, p);
105 rb_insert_color(&th->node, &xi->ticket_handlers);
106 return th;
109 static void remove_ticket_handler(struct ceph_auth_client *ac,
110 struct ceph_x_ticket_handler *th)
112 struct ceph_x_info *xi = ac->private;
114 dout("remove_ticket_handler %p %d\n", th, th->service);
115 rb_erase(&th->node, &xi->ticket_handlers);
116 ceph_crypto_key_destroy(&th->session_key);
117 if (th->ticket_blob)
118 ceph_buffer_put(th->ticket_blob);
119 kfree(th);
122 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
123 struct ceph_crypto_key *secret,
124 void *buf, void *end)
126 struct ceph_x_info *xi = ac->private;
127 int num;
128 void *p = buf;
129 int ret;
130 char *dbuf;
131 char *ticket_buf;
132 u8 struct_v;
134 dbuf = kmem_cache_alloc(ceph_x_ticketbuf_cachep, GFP_NOFS | GFP_ATOMIC);
135 if (!dbuf)
136 return -ENOMEM;
138 ret = -ENOMEM;
139 ticket_buf = kmem_cache_alloc(ceph_x_ticketbuf_cachep,
140 GFP_NOFS | GFP_ATOMIC);
141 if (!ticket_buf)
142 goto out_dbuf;
144 ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
145 struct_v = ceph_decode_8(&p);
146 if (struct_v != 1)
147 goto bad;
148 num = ceph_decode_32(&p);
149 dout("%d tickets\n", num);
150 while (num--) {
151 int type;
152 u8 struct_v;
153 struct ceph_x_ticket_handler *th;
154 void *dp, *dend;
155 int dlen;
156 char is_enc;
157 struct timespec validity;
158 struct ceph_crypto_key old_key;
159 void *tp, *tpend;
160 struct ceph_timespec new_validity;
161 struct ceph_crypto_key new_session_key;
162 struct ceph_buffer *new_ticket_blob;
163 unsigned long new_expires, new_renew_after;
164 u64 new_secret_id;
166 ceph_decode_need(&p, end, sizeof(u32) + 1, bad);
168 type = ceph_decode_32(&p);
169 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
171 struct_v = ceph_decode_8(&p);
172 if (struct_v != 1)
173 goto bad;
175 th = get_ticket_handler(ac, type);
176 if (IS_ERR(th)) {
177 ret = PTR_ERR(th);
178 goto out;
181 /* blob for me */
182 dlen = ceph_x_decrypt(secret, &p, end, dbuf,
183 TEMP_TICKET_BUF_LEN);
184 if (dlen <= 0) {
185 ret = dlen;
186 goto out;
188 dout(" decrypted %d bytes\n", dlen);
189 dend = dbuf + dlen;
190 dp = dbuf;
192 struct_v = ceph_decode_8(&dp);
193 if (struct_v != 1)
194 goto bad;
196 memcpy(&old_key, &th->session_key, sizeof(old_key));
197 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
198 if (ret)
199 goto out;
201 ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
202 ceph_decode_timespec(&validity, &new_validity);
203 new_expires = get_seconds() + validity.tv_sec;
204 new_renew_after = new_expires - (validity.tv_sec / 4);
205 dout(" expires=%lu renew_after=%lu\n", new_expires,
206 new_renew_after);
208 /* ticket blob for service */
209 ceph_decode_8_safe(&p, end, is_enc, bad);
210 tp = ticket_buf;
211 if (is_enc) {
212 /* encrypted */
213 dout(" encrypted ticket\n");
214 dlen = ceph_x_decrypt(&old_key, &p, end, ticket_buf,
215 TEMP_TICKET_BUF_LEN);
216 if (dlen < 0) {
217 ret = dlen;
218 goto out;
220 dlen = ceph_decode_32(&tp);
221 } else {
222 /* unencrypted */
223 ceph_decode_32_safe(&p, end, dlen, bad);
224 ceph_decode_need(&p, end, dlen, bad);
225 ceph_decode_copy(&p, ticket_buf, dlen);
227 tpend = tp + dlen;
228 dout(" ticket blob is %d bytes\n", dlen);
229 ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
230 struct_v = ceph_decode_8(&tp);
231 new_secret_id = ceph_decode_64(&tp);
232 ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
233 if (ret)
234 goto out;
236 /* all is well, update our ticket */
237 ceph_crypto_key_destroy(&th->session_key);
238 if (th->ticket_blob)
239 ceph_buffer_put(th->ticket_blob);
240 th->session_key = new_session_key;
241 th->ticket_blob = new_ticket_blob;
242 th->validity = new_validity;
243 th->secret_id = new_secret_id;
244 th->expires = new_expires;
245 th->renew_after = new_renew_after;
246 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
247 type, ceph_entity_type_name(type), th->secret_id,
248 (int)th->ticket_blob->vec.iov_len);
249 xi->have_keys |= th->service;
252 ret = 0;
253 out:
254 kmem_cache_free(ceph_x_ticketbuf_cachep, ticket_buf);
255 out_dbuf:
256 kmem_cache_free(ceph_x_ticketbuf_cachep, dbuf);
257 return ret;
259 bad:
260 ret = -EINVAL;
261 goto out;
264 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
265 struct ceph_x_ticket_handler *th,
266 struct ceph_x_authorizer *au)
268 int maxlen;
269 struct ceph_x_authorize_a *msg_a;
270 struct ceph_x_authorize_b msg_b;
271 void *p, *end;
272 int ret;
273 int ticket_blob_len =
274 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
276 dout("build_authorizer for %s %p\n",
277 ceph_entity_type_name(th->service), au);
279 maxlen = sizeof(*msg_a) + sizeof(msg_b) +
280 ceph_x_encrypt_buflen(ticket_blob_len);
281 dout(" need len %d\n", maxlen);
282 if (au->buf && au->buf->alloc_len < maxlen) {
283 ceph_buffer_put(au->buf);
284 au->buf = NULL;
286 if (!au->buf) {
287 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
288 if (!au->buf)
289 return -ENOMEM;
291 au->service = th->service;
293 msg_a = au->buf->vec.iov_base;
294 msg_a->struct_v = 1;
295 msg_a->global_id = cpu_to_le64(ac->global_id);
296 msg_a->service_id = cpu_to_le32(th->service);
297 msg_a->ticket_blob.struct_v = 1;
298 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
299 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
300 if (ticket_blob_len) {
301 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
302 th->ticket_blob->vec.iov_len);
304 dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
305 le64_to_cpu(msg_a->ticket_blob.secret_id));
307 p = msg_a + 1;
308 p += ticket_blob_len;
309 end = au->buf->vec.iov_base + au->buf->vec.iov_len;
311 get_random_bytes(&au->nonce, sizeof(au->nonce));
312 msg_b.struct_v = 1;
313 msg_b.nonce = cpu_to_le64(au->nonce);
314 ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
315 p, end - p);
316 if (ret < 0)
317 goto out_buf;
318 p += ret;
319 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
320 dout(" built authorizer nonce %llx len %d\n", au->nonce,
321 (int)au->buf->vec.iov_len);
322 BUG_ON(au->buf->vec.iov_len > maxlen);
323 return 0;
325 out_buf:
326 ceph_buffer_put(au->buf);
327 au->buf = NULL;
328 return ret;
331 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
332 void **p, void *end)
334 ceph_decode_need(p, end, 1 + sizeof(u64), bad);
335 ceph_encode_8(p, 1);
336 ceph_encode_64(p, th->secret_id);
337 if (th->ticket_blob) {
338 const char *buf = th->ticket_blob->vec.iov_base;
339 u32 len = th->ticket_blob->vec.iov_len;
341 ceph_encode_32_safe(p, end, len, bad);
342 ceph_encode_copy_safe(p, end, buf, len, bad);
343 } else {
344 ceph_encode_32_safe(p, end, 0, bad);
347 return 0;
348 bad:
349 return -ERANGE;
352 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
354 int want = ac->want_keys;
355 struct ceph_x_info *xi = ac->private;
356 int service;
358 *pneed = ac->want_keys & ~(xi->have_keys);
360 for (service = 1; service <= want; service <<= 1) {
361 struct ceph_x_ticket_handler *th;
363 if (!(ac->want_keys & service))
364 continue;
366 if (*pneed & service)
367 continue;
369 th = get_ticket_handler(ac, service);
371 if (!th) {
372 *pneed |= service;
373 continue;
376 if (get_seconds() >= th->renew_after)
377 *pneed |= service;
378 if (get_seconds() >= th->expires)
379 xi->have_keys &= ~service;
384 static int ceph_x_build_request(struct ceph_auth_client *ac,
385 void *buf, void *end)
387 struct ceph_x_info *xi = ac->private;
388 int need;
389 struct ceph_x_request_header *head = buf;
390 int ret;
391 struct ceph_x_ticket_handler *th =
392 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
394 ceph_x_validate_tickets(ac, &need);
396 dout("build_request want %x have %x need %x\n",
397 ac->want_keys, xi->have_keys, need);
399 if (need & CEPH_ENTITY_TYPE_AUTH) {
400 struct ceph_x_authenticate *auth = (void *)(head + 1);
401 void *p = auth + 1;
402 struct ceph_x_challenge_blob tmp;
403 char tmp_enc[40];
404 u64 *u;
406 if (p > end)
407 return -ERANGE;
409 dout(" get_auth_session_key\n");
410 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
412 /* encrypt and hash */
413 get_random_bytes(&auth->client_challenge, sizeof(u64));
414 tmp.client_challenge = auth->client_challenge;
415 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
416 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
417 tmp_enc, sizeof(tmp_enc));
418 if (ret < 0)
419 return ret;
421 auth->struct_v = 1;
422 auth->key = 0;
423 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
424 auth->key ^= *u;
425 dout(" server_challenge %llx client_challenge %llx key %llx\n",
426 xi->server_challenge, le64_to_cpu(auth->client_challenge),
427 le64_to_cpu(auth->key));
429 /* now encode the old ticket if exists */
430 ret = ceph_x_encode_ticket(th, &p, end);
431 if (ret < 0)
432 return ret;
434 return p - buf;
437 if (need) {
438 void *p = head + 1;
439 struct ceph_x_service_ticket_request *req;
441 if (p > end)
442 return -ERANGE;
443 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
445 BUG_ON(!th);
446 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
447 if (ret)
448 return ret;
449 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
450 xi->auth_authorizer.buf->vec.iov_len);
452 req = p;
453 req->keys = cpu_to_le32(need);
454 p += sizeof(*req);
455 return p - buf;
458 return 0;
461 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
462 void *buf, void *end)
464 struct ceph_x_info *xi = ac->private;
465 struct ceph_x_reply_header *head = buf;
466 struct ceph_x_ticket_handler *th;
467 int len = end - buf;
468 int op;
469 int ret;
471 if (result)
472 return result; /* XXX hmm? */
474 if (xi->starting) {
475 /* it's a hello */
476 struct ceph_x_server_challenge *sc = buf;
478 if (len != sizeof(*sc))
479 return -EINVAL;
480 xi->server_challenge = le64_to_cpu(sc->server_challenge);
481 dout("handle_reply got server challenge %llx\n",
482 xi->server_challenge);
483 xi->starting = false;
484 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
485 return -EAGAIN;
488 op = le32_to_cpu(head->op);
489 result = le32_to_cpu(head->result);
490 dout("handle_reply op %d result %d\n", op, result);
491 switch (op) {
492 case CEPHX_GET_AUTH_SESSION_KEY:
493 /* verify auth key */
494 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
495 buf + sizeof(*head), end);
496 break;
498 case CEPHX_GET_PRINCIPAL_SESSION_KEY:
499 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
500 BUG_ON(!th);
501 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
502 buf + sizeof(*head), end);
503 break;
505 default:
506 return -EINVAL;
508 if (ret)
509 return ret;
510 if (ac->want_keys == xi->have_keys)
511 return 0;
512 return -EAGAIN;
515 static int ceph_x_create_authorizer(
516 struct ceph_auth_client *ac, int peer_type,
517 struct ceph_authorizer **a,
518 void **buf, size_t *len,
519 void **reply_buf, size_t *reply_len)
521 struct ceph_x_authorizer *au;
522 struct ceph_x_ticket_handler *th;
523 int ret;
525 th = get_ticket_handler(ac, peer_type);
526 if (IS_ERR(th))
527 return PTR_ERR(th);
529 au = kzalloc(sizeof(*au), GFP_NOFS);
530 if (!au)
531 return -ENOMEM;
533 ret = ceph_x_build_authorizer(ac, th, au);
534 if (ret) {
535 kfree(au);
536 return ret;
539 *a = (struct ceph_authorizer *)au;
540 *buf = au->buf->vec.iov_base;
541 *len = au->buf->vec.iov_len;
542 *reply_buf = au->reply_buf;
543 *reply_len = sizeof(au->reply_buf);
544 return 0;
547 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
548 struct ceph_authorizer *a, size_t len)
550 struct ceph_x_authorizer *au = (void *)a;
551 struct ceph_x_ticket_handler *th;
552 int ret = 0;
553 struct ceph_x_authorize_reply reply;
554 void *p = au->reply_buf;
555 void *end = p + sizeof(au->reply_buf);
557 th = get_ticket_handler(ac, au->service);
558 if (!th)
559 return -EIO; /* hrm! */
560 ret = ceph_x_decrypt(&th->session_key, &p, end, &reply, sizeof(reply));
561 if (ret < 0)
562 return ret;
563 if (ret != sizeof(reply))
564 return -EPERM;
566 if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
567 ret = -EPERM;
568 else
569 ret = 0;
570 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
571 au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
572 return ret;
575 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
576 struct ceph_authorizer *a)
578 struct ceph_x_authorizer *au = (void *)a;
580 ceph_buffer_put(au->buf);
581 kfree(au);
585 static void ceph_x_reset(struct ceph_auth_client *ac)
587 struct ceph_x_info *xi = ac->private;
589 dout("reset\n");
590 xi->starting = true;
591 xi->server_challenge = 0;
594 static void ceph_x_destroy(struct ceph_auth_client *ac)
596 struct ceph_x_info *xi = ac->private;
597 struct rb_node *p;
599 dout("ceph_x_destroy %p\n", ac);
600 ceph_crypto_key_destroy(&xi->secret);
602 while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
603 struct ceph_x_ticket_handler *th =
604 rb_entry(p, struct ceph_x_ticket_handler, node);
605 remove_ticket_handler(ac, th);
608 kmem_cache_destroy(ceph_x_ticketbuf_cachep);
610 kfree(ac->private);
611 ac->private = NULL;
614 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
615 int peer_type)
617 struct ceph_x_ticket_handler *th;
619 th = get_ticket_handler(ac, peer_type);
620 if (th && !IS_ERR(th))
621 remove_ticket_handler(ac, th);
625 static const struct ceph_auth_client_ops ceph_x_ops = {
626 .is_authenticated = ceph_x_is_authenticated,
627 .build_request = ceph_x_build_request,
628 .handle_reply = ceph_x_handle_reply,
629 .create_authorizer = ceph_x_create_authorizer,
630 .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
631 .destroy_authorizer = ceph_x_destroy_authorizer,
632 .invalidate_authorizer = ceph_x_invalidate_authorizer,
633 .reset = ceph_x_reset,
634 .destroy = ceph_x_destroy,
638 int ceph_x_init(struct ceph_auth_client *ac)
640 struct ceph_x_info *xi;
641 int ret;
643 dout("ceph_x_init %p\n", ac);
644 xi = kzalloc(sizeof(*xi), GFP_NOFS);
645 if (!xi)
646 return -ENOMEM;
648 ret = -ENOMEM;
649 ceph_x_ticketbuf_cachep = kmem_cache_create("ceph_x_ticketbuf",
650 TEMP_TICKET_BUF_LEN, 8,
651 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
652 NULL);
653 if (!ceph_x_ticketbuf_cachep)
654 goto done_nomem;
655 ret = -EINVAL;
656 if (!ac->secret) {
657 pr_err("no secret set (for auth_x protocol)\n");
658 goto done_nomem;
661 ret = ceph_crypto_key_unarmor(&xi->secret, ac->secret);
662 if (ret)
663 goto done_nomem;
665 xi->starting = true;
666 xi->ticket_handlers = RB_ROOT;
668 ac->protocol = CEPH_AUTH_CEPHX;
669 ac->private = xi;
670 ac->ops = &ceph_x_ops;
671 return 0;
673 done_nomem:
674 kfree(xi);
675 if (ceph_x_ticketbuf_cachep)
676 kmem_cache_destroy(ceph_x_ticketbuf_cachep);
677 return ret;