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>
11 #include <linux/ceph/libceph.h>
12 #include <linux/ceph/messenger.h>
16 #include "auth_x_protocol.h"
18 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
20 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
22 struct ceph_x_info *xi = ac->private;
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;
31 static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
33 struct ceph_x_info *xi = ac->private;
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);
42 static int ceph_x_encrypt_offset(void)
44 return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
47 static int ceph_x_encrypt_buflen(int ilen)
49 return ceph_x_encrypt_offset() + ilen + 16;
52 static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
53 int buf_len, int plaintext_len)
55 struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
60 hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
62 ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
63 plaintext_len + sizeof(struct ceph_x_encrypt_header),
68 ceph_encode_32(&buf, ciphertext_len);
69 return sizeof(u32) + ciphertext_len;
72 static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
74 struct ceph_x_encrypt_header *hdr = *p + sizeof(u32);
75 int ciphertext_len, plaintext_len;
78 ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
79 ceph_decode_need(p, end, ciphertext_len, e_inval);
81 ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len,
86 if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC)
90 return plaintext_len - sizeof(struct ceph_x_encrypt_header);
97 * get existing (or insert new) ticket handler
99 static struct ceph_x_ticket_handler *
100 get_ticket_handler(struct ceph_auth_client *ac, int service)
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;
108 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
109 if (service < th->service)
111 else if (service > th->service)
118 th = kzalloc(sizeof(*th), GFP_NOFS);
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);
127 static void remove_ticket_handler(struct ceph_auth_client *ac,
128 struct ceph_x_ticket_handler *th)
130 struct ceph_x_info *xi = ac->private;
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);
136 ceph_buffer_put(th->ticket_blob);
140 static int process_one_ticket(struct ceph_auth_client *ac,
141 struct ceph_crypto_key *secret,
144 struct ceph_x_info *xi = ac->private;
146 u8 tkt_struct_v, blob_struct_v;
147 struct ceph_x_ticket_handler *th;
151 struct timespec 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 dp = *p + ceph_x_encrypt_offset();
177 ret = ceph_x_decrypt(secret, p, end);
180 dout(" decrypted %d bytes\n", ret);
183 tkt_struct_v = ceph_decode_8(&dp);
184 if (tkt_struct_v != 1)
187 ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
191 ceph_decode_timespec(&validity, dp);
192 dp += sizeof(struct ceph_timespec);
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,
198 /* ticket blob for service */
199 ceph_decode_8_safe(p, end, is_enc, bad);
202 tp = *p + ceph_x_encrypt_offset();
203 ret = ceph_x_decrypt(&th->session_key, p, end);
206 dout(" encrypted ticket, decrypted %d bytes\n", ret);
214 ceph_decode_32_safe(ptp, tpend, dlen, bad);
215 dout(" ticket blob is %d bytes\n", dlen);
216 ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
217 blob_struct_v = ceph_decode_8(ptp);
218 new_secret_id = ceph_decode_64(ptp);
219 ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
223 /* all is well, update our ticket */
224 ceph_crypto_key_destroy(&th->session_key);
226 ceph_buffer_put(th->ticket_blob);
227 th->session_key = new_session_key;
228 th->ticket_blob = new_ticket_blob;
229 th->secret_id = new_secret_id;
230 th->expires = new_expires;
231 th->renew_after = new_renew_after;
233 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
234 type, ceph_entity_type_name(type), th->secret_id,
235 (int)th->ticket_blob->vec.iov_len);
236 xi->have_keys |= th->service;
246 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
247 struct ceph_crypto_key *secret,
248 void *buf, void *end)
255 ceph_decode_8_safe(&p, end, reply_struct_v, bad);
256 if (reply_struct_v != 1)
259 ceph_decode_32_safe(&p, end, num, bad);
260 dout("%d tickets\n", num);
263 ret = process_one_ticket(ac, secret, &p, end);
274 static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
276 ceph_crypto_key_destroy(&au->session_key);
278 ceph_buffer_put(au->buf);
283 static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
284 struct ceph_x_ticket_handler *th,
285 struct ceph_x_authorizer *au)
288 struct ceph_x_authorize_a *msg_a;
289 struct ceph_x_authorize_b *msg_b;
292 int ticket_blob_len =
293 (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
295 dout("build_authorizer for %s %p\n",
296 ceph_entity_type_name(th->service), au);
298 ceph_crypto_key_destroy(&au->session_key);
299 ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
303 maxlen = sizeof(*msg_a) + ticket_blob_len +
304 ceph_x_encrypt_buflen(sizeof(*msg_b));
305 dout(" need len %d\n", maxlen);
306 if (au->buf && au->buf->alloc_len < maxlen) {
307 ceph_buffer_put(au->buf);
311 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
317 au->service = th->service;
318 au->secret_id = th->secret_id;
320 msg_a = au->buf->vec.iov_base;
322 msg_a->global_id = cpu_to_le64(ac->global_id);
323 msg_a->service_id = cpu_to_le32(th->service);
324 msg_a->ticket_blob.struct_v = 1;
325 msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
326 msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
327 if (ticket_blob_len) {
328 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
329 th->ticket_blob->vec.iov_len);
331 dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
332 le64_to_cpu(msg_a->ticket_blob.secret_id));
335 p += ticket_blob_len;
336 end = au->buf->vec.iov_base + au->buf->vec.iov_len;
338 msg_b = p + ceph_x_encrypt_offset();
340 get_random_bytes(&au->nonce, sizeof(au->nonce));
341 msg_b->nonce = cpu_to_le64(au->nonce);
342 ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
348 au->buf->vec.iov_len = p - au->buf->vec.iov_base;
349 dout(" built authorizer nonce %llx len %d\n", au->nonce,
350 (int)au->buf->vec.iov_len);
354 ceph_x_authorizer_cleanup(au);
358 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
361 ceph_decode_need(p, end, 1 + sizeof(u64), bad);
363 ceph_encode_64(p, th->secret_id);
364 if (th->ticket_blob) {
365 const char *buf = th->ticket_blob->vec.iov_base;
366 u32 len = th->ticket_blob->vec.iov_len;
368 ceph_encode_32_safe(p, end, len, bad);
369 ceph_encode_copy_safe(p, end, buf, len, bad);
371 ceph_encode_32_safe(p, end, 0, bad);
379 static bool need_key(struct ceph_x_ticket_handler *th)
384 return get_seconds() >= th->renew_after;
387 static bool have_key(struct ceph_x_ticket_handler *th)
390 if (get_seconds() >= th->expires)
391 th->have_key = false;
397 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
399 int want = ac->want_keys;
400 struct ceph_x_info *xi = ac->private;
403 *pneed = ac->want_keys & ~(xi->have_keys);
405 for (service = 1; service <= want; service <<= 1) {
406 struct ceph_x_ticket_handler *th;
408 if (!(ac->want_keys & service))
411 if (*pneed & service)
414 th = get_ticket_handler(ac, service);
423 xi->have_keys &= ~service;
427 static int ceph_x_build_request(struct ceph_auth_client *ac,
428 void *buf, void *end)
430 struct ceph_x_info *xi = ac->private;
432 struct ceph_x_request_header *head = buf;
434 struct ceph_x_ticket_handler *th =
435 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
440 ceph_x_validate_tickets(ac, &need);
442 dout("build_request want %x have %x need %x\n",
443 ac->want_keys, xi->have_keys, need);
445 if (need & CEPH_ENTITY_TYPE_AUTH) {
446 struct ceph_x_authenticate *auth = (void *)(head + 1);
448 void *enc_buf = xi->auth_authorizer.enc_buf;
449 struct ceph_x_challenge_blob *blob = enc_buf +
450 ceph_x_encrypt_offset();
456 dout(" get_auth_session_key\n");
457 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
459 /* encrypt and hash */
460 get_random_bytes(&auth->client_challenge, sizeof(u64));
461 blob->client_challenge = auth->client_challenge;
462 blob->server_challenge = cpu_to_le64(xi->server_challenge);
463 ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
470 for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
471 auth->key ^= *(__le64 *)u;
472 dout(" server_challenge %llx client_challenge %llx key %llx\n",
473 xi->server_challenge, le64_to_cpu(auth->client_challenge),
474 le64_to_cpu(auth->key));
476 /* now encode the old ticket if exists */
477 ret = ceph_x_encode_ticket(th, &p, end);
486 struct ceph_x_service_ticket_request *req;
490 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
492 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
495 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
496 xi->auth_authorizer.buf->vec.iov_len);
499 req->keys = cpu_to_le32(need);
507 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
508 void *buf, void *end)
510 struct ceph_x_info *xi = ac->private;
511 struct ceph_x_reply_header *head = buf;
512 struct ceph_x_ticket_handler *th;
518 return result; /* XXX hmm? */
522 struct ceph_x_server_challenge *sc = buf;
524 if (len != sizeof(*sc))
526 xi->server_challenge = le64_to_cpu(sc->server_challenge);
527 dout("handle_reply got server challenge %llx\n",
528 xi->server_challenge);
529 xi->starting = false;
530 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
534 op = le16_to_cpu(head->op);
535 result = le32_to_cpu(head->result);
536 dout("handle_reply op %d result %d\n", op, result);
538 case CEPHX_GET_AUTH_SESSION_KEY:
539 /* verify auth key */
540 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
541 buf + sizeof(*head), end);
544 case CEPHX_GET_PRINCIPAL_SESSION_KEY:
545 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
548 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
549 buf + sizeof(*head), end);
557 if (ac->want_keys == xi->have_keys)
562 static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
564 struct ceph_x_authorizer *au = (void *)a;
566 ceph_x_authorizer_cleanup(au);
570 static int ceph_x_create_authorizer(
571 struct ceph_auth_client *ac, int peer_type,
572 struct ceph_auth_handshake *auth)
574 struct ceph_x_authorizer *au;
575 struct ceph_x_ticket_handler *th;
578 th = get_ticket_handler(ac, peer_type);
582 au = kzalloc(sizeof(*au), GFP_NOFS);
586 au->base.destroy = ceph_x_destroy_authorizer;
588 ret = ceph_x_build_authorizer(ac, th, au);
594 auth->authorizer = (struct ceph_authorizer *) au;
595 auth->authorizer_buf = au->buf->vec.iov_base;
596 auth->authorizer_buf_len = au->buf->vec.iov_len;
597 auth->authorizer_reply_buf = au->enc_buf;
598 auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
599 auth->sign_message = ac->ops->sign_message;
600 auth->check_message_signature = ac->ops->check_message_signature;
605 static int ceph_x_update_authorizer(
606 struct ceph_auth_client *ac, int peer_type,
607 struct ceph_auth_handshake *auth)
609 struct ceph_x_authorizer *au;
610 struct ceph_x_ticket_handler *th;
612 th = get_ticket_handler(ac, peer_type);
616 au = (struct ceph_x_authorizer *)auth->authorizer;
617 if (au->secret_id < th->secret_id) {
618 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
619 au->service, au->secret_id, th->secret_id);
620 return ceph_x_build_authorizer(ac, th, au);
625 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
626 struct ceph_authorizer *a)
628 struct ceph_x_authorizer *au = (void *)a;
629 void *p = au->enc_buf;
630 struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
633 ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
636 if (ret != sizeof(*reply))
639 if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
643 dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
644 au->nonce, le64_to_cpu(reply->nonce_plus_one), ret);
648 static void ceph_x_reset(struct ceph_auth_client *ac)
650 struct ceph_x_info *xi = ac->private;
654 xi->server_challenge = 0;
657 static void ceph_x_destroy(struct ceph_auth_client *ac)
659 struct ceph_x_info *xi = ac->private;
662 dout("ceph_x_destroy %p\n", ac);
663 ceph_crypto_key_destroy(&xi->secret);
665 while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
666 struct ceph_x_ticket_handler *th =
667 rb_entry(p, struct ceph_x_ticket_handler, node);
668 remove_ticket_handler(ac, th);
671 ceph_x_authorizer_cleanup(&xi->auth_authorizer);
677 static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
679 struct ceph_x_ticket_handler *th;
681 th = get_ticket_handler(ac, peer_type);
683 th->have_key = false;
686 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
690 * We are to invalidate a service ticket in the hopes of
691 * getting a new, hopefully more valid, one. But, we won't get
692 * it unless our AUTH ticket is good, so invalidate AUTH ticket
693 * as well, just in case.
695 invalidate_ticket(ac, peer_type);
696 invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
699 static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
702 void *enc_buf = au->enc_buf;
709 } __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
712 sigblock->len = cpu_to_le32(4*sizeof(u32));
713 sigblock->header_crc = msg->hdr.crc;
714 sigblock->front_crc = msg->footer.front_crc;
715 sigblock->middle_crc = msg->footer.middle_crc;
716 sigblock->data_crc = msg->footer.data_crc;
717 ret = ceph_x_encrypt(&au->session_key, enc_buf, CEPHX_AU_ENC_BUF_LEN,
722 *psig = *(__le64 *)(enc_buf + sizeof(u32));
726 static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
727 struct ceph_msg *msg)
732 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
735 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
740 msg->footer.sig = sig;
741 msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
745 static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
746 struct ceph_msg *msg)
751 if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
754 ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
758 if (sig_check == msg->footer.sig)
760 if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
761 dout("ceph_x_check_message_signature %p has signature %llx "
762 "expect %llx\n", msg, msg->footer.sig, sig_check);
764 dout("ceph_x_check_message_signature %p sender did not set "
765 "CEPH_MSG_FOOTER_SIGNED\n", msg);
769 static const struct ceph_auth_client_ops ceph_x_ops = {
771 .is_authenticated = ceph_x_is_authenticated,
772 .should_authenticate = ceph_x_should_authenticate,
773 .build_request = ceph_x_build_request,
774 .handle_reply = ceph_x_handle_reply,
775 .create_authorizer = ceph_x_create_authorizer,
776 .update_authorizer = ceph_x_update_authorizer,
777 .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
778 .invalidate_authorizer = ceph_x_invalidate_authorizer,
779 .reset = ceph_x_reset,
780 .destroy = ceph_x_destroy,
781 .sign_message = ceph_x_sign_message,
782 .check_message_signature = ceph_x_check_message_signature,
786 int ceph_x_init(struct ceph_auth_client *ac)
788 struct ceph_x_info *xi;
791 dout("ceph_x_init %p\n", ac);
793 xi = kzalloc(sizeof(*xi), GFP_NOFS);
799 pr_err("no secret set (for auth_x protocol)\n");
803 ret = ceph_crypto_key_clone(&xi->secret, ac->key);
805 pr_err("cannot clone key: %d\n", ret);
810 xi->ticket_handlers = RB_ROOT;
812 ac->protocol = CEPH_AUTH_CEPHX;
814 ac->ops = &ceph_x_ops;