2 #include <linux/ceph/ceph_debug.h>
5 #include <linux/module.h>
6 #include <linux/random.h>
7 #include <linux/slab.h>
9 #include <linux/ceph/decode.h>
10 #include <linux/ceph/auth.h>
14 #include "auth_x_protocol.h"
16 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
18 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
20 struct ceph_x_info *xi = ac->private;
23 ceph_x_validate_tickets(ac, &need);
24 dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
25 ac->want_keys, need, xi->have_keys);
26 return (ac->want_keys & xi->have_keys) == ac->want_keys;
29 static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
31 struct ceph_x_info *xi = ac->private;
34 ceph_x_validate_tickets(ac, &need);
35 dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
36 ac->want_keys, need, xi->have_keys);
40 static int ceph_x_encrypt_buflen(int ilen)
42 return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
46 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
47 void *ibuf, int ilen, void *obuf, size_t olen)
49 struct ceph_x_encrypt_header head = {
51 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
53 size_t len = olen - sizeof(u32);
56 ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
57 &head, sizeof(head), ibuf, ilen);
60 ceph_encode_32(&obuf, len);
61 return len + sizeof(u32);
64 static int ceph_x_decrypt(struct ceph_crypto_key *secret,
65 void **p, void *end, void **obuf, size_t olen)
67 struct ceph_x_encrypt_header head;
68 size_t head_len = sizeof(head);
71 len = ceph_decode_32(p);
75 dout("ceph_x_decrypt len %d\n", len);
77 *obuf = kmalloc(len, GFP_NOFS);
83 ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len);
86 if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
93 * get existing (or insert new) ticket handler
95 static struct ceph_x_ticket_handler *
96 get_ticket_handler(struct ceph_auth_client *ac, int service)
98 struct ceph_x_ticket_handler *th;
99 struct ceph_x_info *xi = ac->private;
100 struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
104 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
105 if (service < th->service)
107 else if (service > th->service)
114 th = kzalloc(sizeof(*th), GFP_NOFS);
116 return ERR_PTR(-ENOMEM);
117 th->service = service;
118 rb_link_node(&th->node, parent, p);
119 rb_insert_color(&th->node, &xi->ticket_handlers);
123 static void remove_ticket_handler(struct ceph_auth_client *ac,
124 struct ceph_x_ticket_handler *th)
126 struct ceph_x_info *xi = ac->private;
128 dout("remove_ticket_handler %p %d\n", th, th->service);
129 rb_erase(&th->node, &xi->ticket_handlers);
130 ceph_crypto_key_destroy(&th->session_key);
132 ceph_buffer_put(th->ticket_blob);
136 static int process_one_ticket(struct ceph_auth_client *ac,
137 struct ceph_crypto_key *secret,
140 struct ceph_x_info *xi = ac->private;
142 u8 tkt_struct_v, blob_struct_v;
143 struct ceph_x_ticket_handler *th;
148 struct timespec validity;
149 struct ceph_crypto_key old_key;
150 void *ticket_buf = NULL;
153 struct ceph_timespec new_validity;
154 struct ceph_crypto_key new_session_key;
155 struct ceph_buffer *new_ticket_blob;
156 unsigned long new_expires, new_renew_after;
160 ceph_decode_need(p, end, sizeof(u32) + 1, bad);
162 type = ceph_decode_32(p);
163 dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
165 tkt_struct_v = ceph_decode_8(p);
166 if (tkt_struct_v != 1)
169 th = get_ticket_handler(ac, type);
176 dlen = ceph_x_decrypt(secret, p, end, &dbuf, 0);
181 dout(" decrypted %d bytes\n", dlen);
185 tkt_struct_v = ceph_decode_8(&dp);
186 if (tkt_struct_v != 1)
189 memcpy(&old_key, &th->session_key, sizeof(old_key));
190 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
194 ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
195 ceph_decode_timespec(&validity, &new_validity);
196 new_expires = get_seconds() + validity.tv_sec;
197 new_renew_after = new_expires - (validity.tv_sec / 4);
198 dout(" expires=%lu renew_after=%lu\n", new_expires,
201 /* ticket blob for service */
202 ceph_decode_8_safe(p, end, is_enc, bad);
205 dout(" encrypted ticket\n");
206 dlen = ceph_x_decrypt(&old_key, p, end, &ticket_buf, 0);
219 ceph_decode_32_safe(ptp, tpend, dlen, bad);
220 dout(" ticket blob is %d bytes\n", dlen);
221 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
222 blob_struct_v = ceph_decode_8(ptp);
223 new_secret_id = ceph_decode_64(ptp);
224 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
228 /* all is well, update our ticket */
229 ceph_crypto_key_destroy(&th->session_key);
231 ceph_buffer_put(th->ticket_blob);
232 th->session_key = new_session_key;
233 th->ticket_blob = new_ticket_blob;
234 th->validity = new_validity;
235 th->secret_id = new_secret_id;
236 th->expires = new_expires;
237 th->renew_after = new_renew_after;
238 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
239 type, ceph_entity_type_name(type), th->secret_id,
240 (int)th->ticket_blob->vec.iov_len);
241 xi->have_keys |= th->service;
253 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
254 struct ceph_crypto_key *secret,
255 void *buf, void *end)
262 ceph_decode_8_safe(&p, end, reply_struct_v, bad);
263 if (reply_struct_v != 1)
266 ceph_decode_32_safe(&p, end, num, bad);
267 dout("%d tickets\n", num);
270 ret = process_one_ticket(ac, secret, &p, end);
281 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
282 struct ceph_x_ticket_handler *th,
283 struct ceph_x_authorizer *au)
286 struct ceph_x_authorize_a *msg_a;
287 struct ceph_x_authorize_b msg_b;
290 int ticket_blob_len =
291 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
293 dout("build_authorizer for %s %p\n",
294 ceph_entity_type_name(th->service), au);
296 maxlen = sizeof(*msg_a) + sizeof(msg_b) +
297 ceph_x_encrypt_buflen(ticket_blob_len);
298 dout(" need len %d\n", maxlen);
299 if (au->buf && au->buf->alloc_len < maxlen) {
300 ceph_buffer_put(au->buf);
304 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
308 au->service = th->service;
309 au->secret_id = th->secret_id;
311 msg_a = au->buf->vec.iov_base;
313 msg_a->global_id = cpu_to_le64(ac->global_id);
314 msg_a->service_id = cpu_to_le32(th->service);
315 msg_a->ticket_blob.struct_v = 1;
316 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
317 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
318 if (ticket_blob_len) {
319 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
320 th->ticket_blob->vec.iov_len);
322 dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
323 le64_to_cpu(msg_a->ticket_blob.secret_id));
326 p += ticket_blob_len;
327 end = au->buf->vec.iov_base + au->buf->vec.iov_len;
329 get_random_bytes(&au->nonce, sizeof(au->nonce));
331 msg_b.nonce = cpu_to_le64(au->nonce);
332 ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
337 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
338 dout(" built authorizer nonce %llx len %d\n", au->nonce,
339 (int)au->buf->vec.iov_len);
340 BUG_ON(au->buf->vec.iov_len > maxlen);
344 ceph_buffer_put(au->buf);
349 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
352 ceph_decode_need(p, end, 1 + sizeof(u64), bad);
354 ceph_encode_64(p, th->secret_id);
355 if (th->ticket_blob) {
356 const char *buf = th->ticket_blob->vec.iov_base;
357 u32 len = th->ticket_blob->vec.iov_len;
359 ceph_encode_32_safe(p, end, len, bad);
360 ceph_encode_copy_safe(p, end, buf, len, bad);
362 ceph_encode_32_safe(p, end, 0, bad);
370 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
372 int want = ac->want_keys;
373 struct ceph_x_info *xi = ac->private;
376 *pneed = ac->want_keys & ~(xi->have_keys);
378 for (service = 1; service <= want; service <<= 1) {
379 struct ceph_x_ticket_handler *th;
381 if (!(ac->want_keys & service))
384 if (*pneed & service)
387 th = get_ticket_handler(ac, service);
394 if (get_seconds() >= th->renew_after)
396 if (get_seconds() >= th->expires)
397 xi->have_keys &= ~service;
402 static int ceph_x_build_request(struct ceph_auth_client *ac,
403 void *buf, void *end)
405 struct ceph_x_info *xi = ac->private;
407 struct ceph_x_request_header *head = buf;
409 struct ceph_x_ticket_handler *th =
410 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
415 ceph_x_validate_tickets(ac, &need);
417 dout("build_request want %x have %x need %x\n",
418 ac->want_keys, xi->have_keys, need);
420 if (need & CEPH_ENTITY_TYPE_AUTH) {
421 struct ceph_x_authenticate *auth = (void *)(head + 1);
423 struct ceph_x_challenge_blob tmp;
430 dout(" get_auth_session_key\n");
431 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
433 /* encrypt and hash */
434 get_random_bytes(&auth->client_challenge, sizeof(u64));
435 tmp.client_challenge = auth->client_challenge;
436 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
437 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
438 tmp_enc, sizeof(tmp_enc));
444 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
445 auth->key ^= *(__le64 *)u;
446 dout(" server_challenge %llx client_challenge %llx key %llx\n",
447 xi->server_challenge, le64_to_cpu(auth->client_challenge),
448 le64_to_cpu(auth->key));
450 /* now encode the old ticket if exists */
451 ret = ceph_x_encode_ticket(th, &p, end);
460 struct ceph_x_service_ticket_request *req;
464 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
466 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
469 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
470 xi->auth_authorizer.buf->vec.iov_len);
473 req->keys = cpu_to_le32(need);
481 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
482 void *buf, void *end)
484 struct ceph_x_info *xi = ac->private;
485 struct ceph_x_reply_header *head = buf;
486 struct ceph_x_ticket_handler *th;
492 return result; /* XXX hmm? */
496 struct ceph_x_server_challenge *sc = buf;
498 if (len != sizeof(*sc))
500 xi->server_challenge = le64_to_cpu(sc->server_challenge);
501 dout("handle_reply got server challenge %llx\n",
502 xi->server_challenge);
503 xi->starting = false;
504 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
508 op = le16_to_cpu(head->op);
509 result = le32_to_cpu(head->result);
510 dout("handle_reply op %d result %d\n", op, result);
512 case CEPHX_GET_AUTH_SESSION_KEY:
513 /* verify auth key */
514 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
515 buf + sizeof(*head), end);
518 case CEPHX_GET_PRINCIPAL_SESSION_KEY:
519 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
522 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
523 buf + sizeof(*head), end);
531 if (ac->want_keys == xi->have_keys)
536 static int ceph_x_create_authorizer(
537 struct ceph_auth_client *ac, int peer_type,
538 struct ceph_auth_handshake *auth)
540 struct ceph_x_authorizer *au;
541 struct ceph_x_ticket_handler *th;
544 th = get_ticket_handler(ac, peer_type);
548 au = kzalloc(sizeof(*au), GFP_NOFS);
552 ret = ceph_x_build_authorizer(ac, th, au);
558 auth->authorizer = (struct ceph_authorizer *) au;
559 auth->authorizer_buf = au->buf->vec.iov_base;
560 auth->authorizer_buf_len = au->buf->vec.iov_len;
561 auth->authorizer_reply_buf = au->reply_buf;
562 auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
567 static int ceph_x_update_authorizer(
568 struct ceph_auth_client *ac, int peer_type,
569 struct ceph_auth_handshake *auth)
571 struct ceph_x_authorizer *au;
572 struct ceph_x_ticket_handler *th;
574 th = get_ticket_handler(ac, peer_type);
578 au = (struct ceph_x_authorizer *)auth->authorizer;
579 if (au->secret_id < th->secret_id) {
580 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
581 au->service, au->secret_id, th->secret_id);
582 return ceph_x_build_authorizer(ac, th, au);
587 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
588 struct ceph_authorizer *a, size_t len)
590 struct ceph_x_authorizer *au = (void *)a;
591 struct ceph_x_ticket_handler *th;
593 struct ceph_x_authorize_reply reply;
594 void *preply = &reply;
595 void *p = au->reply_buf;
596 void *end = p + sizeof(au->reply_buf);
598 th = get_ticket_handler(ac, au->service);
601 ret = ceph_x_decrypt(&th->session_key, &p, end, &preply, sizeof(reply));
604 if (ret != sizeof(reply))
607 if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
611 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
612 au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
616 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
617 struct ceph_authorizer *a)
619 struct ceph_x_authorizer *au = (void *)a;
621 ceph_buffer_put(au->buf);
626 static void ceph_x_reset(struct ceph_auth_client *ac)
628 struct ceph_x_info *xi = ac->private;
632 xi->server_challenge = 0;
635 static void ceph_x_destroy(struct ceph_auth_client *ac)
637 struct ceph_x_info *xi = ac->private;
640 dout("ceph_x_destroy %p\n", ac);
641 ceph_crypto_key_destroy(&xi->secret);
643 while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
644 struct ceph_x_ticket_handler *th =
645 rb_entry(p, struct ceph_x_ticket_handler, node);
646 remove_ticket_handler(ac, th);
649 if (xi->auth_authorizer.buf)
650 ceph_buffer_put(xi->auth_authorizer.buf);
656 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
659 struct ceph_x_ticket_handler *th;
661 th = get_ticket_handler(ac, peer_type);
663 memset(&th->validity, 0, sizeof(th->validity));
667 static const struct ceph_auth_client_ops ceph_x_ops = {
669 .is_authenticated = ceph_x_is_authenticated,
670 .should_authenticate = ceph_x_should_authenticate,
671 .build_request = ceph_x_build_request,
672 .handle_reply = ceph_x_handle_reply,
673 .create_authorizer = ceph_x_create_authorizer,
674 .update_authorizer = ceph_x_update_authorizer,
675 .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
676 .destroy_authorizer = ceph_x_destroy_authorizer,
677 .invalidate_authorizer = ceph_x_invalidate_authorizer,
678 .reset = ceph_x_reset,
679 .destroy = ceph_x_destroy,
683 int ceph_x_init(struct ceph_auth_client *ac)
685 struct ceph_x_info *xi;
688 dout("ceph_x_init %p\n", ac);
690 xi = kzalloc(sizeof(*xi), GFP_NOFS);
696 pr_err("no secret set (for auth_x protocol)\n");
700 ret = ceph_crypto_key_clone(&xi->secret, ac->key);
702 pr_err("cannot clone key: %d\n", ret);
707 xi->ticket_handlers = RB_ROOT;
709 ac->protocol = CEPH_AUTH_CEPHX;
711 ac->ops = &ceph_x_ops;