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TOMOYO Linux Cross Reference
Linux/net/ceph/auth_x.c

Version: ~ [ linux-5.3-rc4 ] ~ [ linux-5.2.8 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.66 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.138 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.71 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 
  2 #include <linux/ceph/ceph_debug.h>
  3 
  4 #include <linux/err.h>
  5 #include <linux/module.h>
  6 #include <linux/random.h>
  7 #include <linux/slab.h>
  8 
  9 #include <linux/ceph/decode.h>
 10 #include <linux/ceph/auth.h>
 11 
 12 #include "crypto.h"
 13 #include "auth_x.h"
 14 #include "auth_x_protocol.h"
 15 
 16 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
 17 
 18 static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
 19 {
 20         struct ceph_x_info *xi = ac->private;
 21         int need;
 22 
 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;
 27 }
 28 
 29 static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
 30 {
 31         struct ceph_x_info *xi = ac->private;
 32         int need;
 33 
 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);
 37         return need != 0;
 38 }
 39 
 40 static int ceph_x_encrypt_buflen(int ilen)
 41 {
 42         return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
 43                 sizeof(u32);
 44 }
 45 
 46 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
 47                           void *ibuf, int ilen, void *obuf, size_t olen)
 48 {
 49         struct ceph_x_encrypt_header head = {
 50                 .struct_v = 1,
 51                 .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
 52         };
 53         size_t len = olen - sizeof(u32);
 54         int ret;
 55 
 56         ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
 57                             &head, sizeof(head), ibuf, ilen);
 58         if (ret)
 59                 return ret;
 60         ceph_encode_32(&obuf, len);
 61         return len + sizeof(u32);
 62 }
 63 
 64 static int ceph_x_decrypt(struct ceph_crypto_key *secret,
 65                           void **p, void *end, void **obuf, size_t olen)
 66 {
 67         struct ceph_x_encrypt_header head;
 68         size_t head_len = sizeof(head);
 69         int len, ret;
 70 
 71         len = ceph_decode_32(p);
 72         if (*p + len > end)
 73                 return -EINVAL;
 74 
 75         dout("ceph_x_decrypt len %d\n", len);
 76         if (*obuf == NULL) {
 77                 *obuf = kmalloc(len, GFP_NOFS);
 78                 if (!*obuf)
 79                         return -ENOMEM;
 80                 olen = len;
 81         }
 82 
 83         ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len);
 84         if (ret)
 85                 return ret;
 86         if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
 87                 return -EPERM;
 88         *p += len;
 89         return olen;
 90 }
 91 
 92 /*
 93  * get existing (or insert new) ticket handler
 94  */
 95 static struct ceph_x_ticket_handler *
 96 get_ticket_handler(struct ceph_auth_client *ac, int service)
 97 {
 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;
101 
102         while (*p) {
103                 parent = *p;
104                 th = rb_entry(parent, struct ceph_x_ticket_handler, node);
105                 if (service < th->service)
106                         p = &(*p)->rb_left;
107                 else if (service > th->service)
108                         p = &(*p)->rb_right;
109                 else
110                         return th;
111         }
112 
113         /* add it */
114         th = kzalloc(sizeof(*th), GFP_NOFS);
115         if (!th)
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);
120         return th;
121 }
122 
123 static void remove_ticket_handler(struct ceph_auth_client *ac,
124                                   struct ceph_x_ticket_handler *th)
125 {
126         struct ceph_x_info *xi = ac->private;
127 
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);
131         if (th->ticket_blob)
132                 ceph_buffer_put(th->ticket_blob);
133         kfree(th);
134 }
135 
136 static int process_one_ticket(struct ceph_auth_client *ac,
137                               struct ceph_crypto_key *secret,
138                               void **p, void *end)
139 {
140         struct ceph_x_info *xi = ac->private;
141         int type;
142         u8 tkt_struct_v, blob_struct_v;
143         struct ceph_x_ticket_handler *th;
144         void *dbuf = NULL;
145         void *dp, *dend;
146         int dlen;
147         char is_enc;
148         struct timespec validity;
149         struct ceph_crypto_key old_key;
150         void *ticket_buf = NULL;
151         void *tp, *tpend;
152         struct ceph_timespec new_validity;
153         struct ceph_crypto_key new_session_key;
154         struct ceph_buffer *new_ticket_blob;
155         unsigned long new_expires, new_renew_after;
156         u64 new_secret_id;
157         int ret;
158 
159         ceph_decode_need(p, end, sizeof(u32) + 1, bad);
160 
161         type = ceph_decode_32(p);
162         dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
163 
164         tkt_struct_v = ceph_decode_8(p);
165         if (tkt_struct_v != 1)
166                 goto bad;
167 
168         th = get_ticket_handler(ac, type);
169         if (IS_ERR(th)) {
170                 ret = PTR_ERR(th);
171                 goto out;
172         }
173 
174         /* blob for me */
175         dlen = ceph_x_decrypt(secret, p, end, &dbuf, 0);
176         if (dlen <= 0) {
177                 ret = dlen;
178                 goto out;
179         }
180         dout(" decrypted %d bytes\n", dlen);
181         dp = dbuf;
182         dend = dp + dlen;
183 
184         tkt_struct_v = ceph_decode_8(&dp);
185         if (tkt_struct_v != 1)
186                 goto bad;
187 
188         memcpy(&old_key, &th->session_key, sizeof(old_key));
189         ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
190         if (ret)
191                 goto out;
192 
193         ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
194         ceph_decode_timespec(&validity, &new_validity);
195         new_expires = get_seconds() + validity.tv_sec;
196         new_renew_after = new_expires - (validity.tv_sec / 4);
197         dout(" expires=%lu renew_after=%lu\n", new_expires,
198              new_renew_after);
199 
200         /* ticket blob for service */
201         ceph_decode_8_safe(p, end, is_enc, bad);
202         if (is_enc) {
203                 /* encrypted */
204                 dout(" encrypted ticket\n");
205                 dlen = ceph_x_decrypt(&old_key, p, end, &ticket_buf, 0);
206                 if (dlen < 0) {
207                         ret = dlen;
208                         goto out;
209                 }
210                 tp = ticket_buf;
211                 dlen = ceph_decode_32(&tp);
212         } else {
213                 /* unencrypted */
214                 ceph_decode_32_safe(p, end, dlen, bad);
215                 ticket_buf = kmalloc(dlen, GFP_NOFS);
216                 if (!ticket_buf) {
217                         ret = -ENOMEM;
218                         goto out;
219                 }
220                 tp = ticket_buf;
221                 ceph_decode_need(p, end, dlen, bad);
222                 ceph_decode_copy(p, ticket_buf, dlen);
223         }
224         tpend = tp + dlen;
225         dout(" ticket blob is %d bytes\n", dlen);
226         ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
227         blob_struct_v = ceph_decode_8(&tp);
228         new_secret_id = ceph_decode_64(&tp);
229         ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
230         if (ret)
231                 goto out;
232 
233         /* all is well, update our ticket */
234         ceph_crypto_key_destroy(&th->session_key);
235         if (th->ticket_blob)
236                 ceph_buffer_put(th->ticket_blob);
237         th->session_key = new_session_key;
238         th->ticket_blob = new_ticket_blob;
239         th->validity = new_validity;
240         th->secret_id = new_secret_id;
241         th->expires = new_expires;
242         th->renew_after = new_renew_after;
243         dout(" got ticket service %d (%s) secret_id %lld len %d\n",
244              type, ceph_entity_type_name(type), th->secret_id,
245              (int)th->ticket_blob->vec.iov_len);
246         xi->have_keys |= th->service;
247 
248 out:
249         kfree(ticket_buf);
250         kfree(dbuf);
251         return ret;
252 
253 bad:
254         ret = -EINVAL;
255         goto out;
256 }
257 
258 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
259                                     struct ceph_crypto_key *secret,
260                                     void *buf, void *end)
261 {
262         void *p = buf;
263         u8 reply_struct_v;
264         u32 num;
265         int ret;
266 
267         ceph_decode_8_safe(&p, end, reply_struct_v, bad);
268         if (reply_struct_v != 1)
269                 return -EINVAL;
270 
271         ceph_decode_32_safe(&p, end, num, bad);
272         dout("%d tickets\n", num);
273 
274         while (num--) {
275                 ret = process_one_ticket(ac, secret, &p, end);
276                 if (ret)
277                         return ret;
278         }
279 
280         return 0;
281 
282 bad:
283         return -EINVAL;
284 }
285 
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 {
290         int maxlen;
291         struct ceph_x_authorize_a *msg_a;
292         struct ceph_x_authorize_b msg_b;
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 
301         maxlen = sizeof(*msg_a) + sizeof(msg_b) +
302                 ceph_x_encrypt_buflen(ticket_blob_len);
303         dout("  need len %d\n", maxlen);
304         if (au->buf && au->buf->alloc_len < maxlen) {
305                 ceph_buffer_put(au->buf);
306                 au->buf = NULL;
307         }
308         if (!au->buf) {
309                 au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
310                 if (!au->buf)
311                         return -ENOMEM;
312         }
313         au->service = th->service;
314         au->secret_id = th->secret_id;
315 
316         msg_a = au->buf->vec.iov_base;
317         msg_a->struct_v = 1;
318         msg_a->global_id = cpu_to_le64(ac->global_id);
319         msg_a->service_id = cpu_to_le32(th->service);
320         msg_a->ticket_blob.struct_v = 1;
321         msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
322         msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
323         if (ticket_blob_len) {
324                 memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
325                        th->ticket_blob->vec.iov_len);
326         }
327         dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
328              le64_to_cpu(msg_a->ticket_blob.secret_id));
329 
330         p = msg_a + 1;
331         p += ticket_blob_len;
332         end = au->buf->vec.iov_base + au->buf->vec.iov_len;
333 
334         get_random_bytes(&au->nonce, sizeof(au->nonce));
335         msg_b.struct_v = 1;
336         msg_b.nonce = cpu_to_le64(au->nonce);
337         ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
338                              p, end - p);
339         if (ret < 0)
340                 goto out_buf;
341         p += ret;
342         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
343         dout(" built authorizer nonce %llx len %d\n", au->nonce,
344              (int)au->buf->vec.iov_len);
345         BUG_ON(au->buf->vec.iov_len > maxlen);
346         return 0;
347 
348 out_buf:
349         ceph_buffer_put(au->buf);
350         au->buf = NULL;
351         return ret;
352 }
353 
354 static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
355                                 void **p, void *end)
356 {
357         ceph_decode_need(p, end, 1 + sizeof(u64), bad);
358         ceph_encode_8(p, 1);
359         ceph_encode_64(p, th->secret_id);
360         if (th->ticket_blob) {
361                 const char *buf = th->ticket_blob->vec.iov_base;
362                 u32 len = th->ticket_blob->vec.iov_len;
363 
364                 ceph_encode_32_safe(p, end, len, bad);
365                 ceph_encode_copy_safe(p, end, buf, len, bad);
366         } else {
367                 ceph_encode_32_safe(p, end, 0, bad);
368         }
369 
370         return 0;
371 bad:
372         return -ERANGE;
373 }
374 
375 static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
376 {
377         int want = ac->want_keys;
378         struct ceph_x_info *xi = ac->private;
379         int service;
380 
381         *pneed = ac->want_keys & ~(xi->have_keys);
382 
383         for (service = 1; service <= want; service <<= 1) {
384                 struct ceph_x_ticket_handler *th;
385 
386                 if (!(ac->want_keys & service))
387                         continue;
388 
389                 if (*pneed & service)
390                         continue;
391 
392                 th = get_ticket_handler(ac, service);
393 
394                 if (IS_ERR(th)) {
395                         *pneed |= service;
396                         continue;
397                 }
398 
399                 if (get_seconds() >= th->renew_after)
400                         *pneed |= service;
401                 if (get_seconds() >= th->expires)
402                         xi->have_keys &= ~service;
403         }
404 }
405 
406 
407 static int ceph_x_build_request(struct ceph_auth_client *ac,
408                                 void *buf, void *end)
409 {
410         struct ceph_x_info *xi = ac->private;
411         int need;
412         struct ceph_x_request_header *head = buf;
413         int ret;
414         struct ceph_x_ticket_handler *th =
415                 get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
416 
417         if (IS_ERR(th))
418                 return PTR_ERR(th);
419 
420         ceph_x_validate_tickets(ac, &need);
421 
422         dout("build_request want %x have %x need %x\n",
423              ac->want_keys, xi->have_keys, need);
424 
425         if (need & CEPH_ENTITY_TYPE_AUTH) {
426                 struct ceph_x_authenticate *auth = (void *)(head + 1);
427                 void *p = auth + 1;
428                 struct ceph_x_challenge_blob tmp;
429                 char tmp_enc[40];
430                 u64 *u;
431 
432                 if (p > end)
433                         return -ERANGE;
434 
435                 dout(" get_auth_session_key\n");
436                 head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
437 
438                 /* encrypt and hash */
439                 get_random_bytes(&auth->client_challenge, sizeof(u64));
440                 tmp.client_challenge = auth->client_challenge;
441                 tmp.server_challenge = cpu_to_le64(xi->server_challenge);
442                 ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
443                                      tmp_enc, sizeof(tmp_enc));
444                 if (ret < 0)
445                         return ret;
446 
447                 auth->struct_v = 1;
448                 auth->key = 0;
449                 for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
450                         auth->key ^= *(__le64 *)u;
451                 dout(" server_challenge %llx client_challenge %llx key %llx\n",
452                      xi->server_challenge, le64_to_cpu(auth->client_challenge),
453                      le64_to_cpu(auth->key));
454 
455                 /* now encode the old ticket if exists */
456                 ret = ceph_x_encode_ticket(th, &p, end);
457                 if (ret < 0)
458                         return ret;
459 
460                 return p - buf;
461         }
462 
463         if (need) {
464                 void *p = head + 1;
465                 struct ceph_x_service_ticket_request *req;
466 
467                 if (p > end)
468                         return -ERANGE;
469                 head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
470 
471                 ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
472                 if (ret)
473                         return ret;
474                 ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
475                                  xi->auth_authorizer.buf->vec.iov_len);
476 
477                 req = p;
478                 req->keys = cpu_to_le32(need);
479                 p += sizeof(*req);
480                 return p - buf;
481         }
482 
483         return 0;
484 }
485 
486 static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
487                                void *buf, void *end)
488 {
489         struct ceph_x_info *xi = ac->private;
490         struct ceph_x_reply_header *head = buf;
491         struct ceph_x_ticket_handler *th;
492         int len = end - buf;
493         int op;
494         int ret;
495 
496         if (result)
497                 return result;  /* XXX hmm? */
498 
499         if (xi->starting) {
500                 /* it's a hello */
501                 struct ceph_x_server_challenge *sc = buf;
502 
503                 if (len != sizeof(*sc))
504                         return -EINVAL;
505                 xi->server_challenge = le64_to_cpu(sc->server_challenge);
506                 dout("handle_reply got server challenge %llx\n",
507                      xi->server_challenge);
508                 xi->starting = false;
509                 xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
510                 return -EAGAIN;
511         }
512 
513         op = le16_to_cpu(head->op);
514         result = le32_to_cpu(head->result);
515         dout("handle_reply op %d result %d\n", op, result);
516         switch (op) {
517         case CEPHX_GET_AUTH_SESSION_KEY:
518                 /* verify auth key */
519                 ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
520                                                buf + sizeof(*head), end);
521                 break;
522 
523         case CEPHX_GET_PRINCIPAL_SESSION_KEY:
524                 th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
525                 if (IS_ERR(th))
526                         return PTR_ERR(th);
527                 ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
528                                                buf + sizeof(*head), end);
529                 break;
530 
531         default:
532                 return -EINVAL;
533         }
534         if (ret)
535                 return ret;
536         if (ac->want_keys == xi->have_keys)
537                 return 0;
538         return -EAGAIN;
539 }
540 
541 static int ceph_x_create_authorizer(
542         struct ceph_auth_client *ac, int peer_type,
543         struct ceph_auth_handshake *auth)
544 {
545         struct ceph_x_authorizer *au;
546         struct ceph_x_ticket_handler *th;
547         int ret;
548 
549         th = get_ticket_handler(ac, peer_type);
550         if (IS_ERR(th))
551                 return PTR_ERR(th);
552 
553         au = kzalloc(sizeof(*au), GFP_NOFS);
554         if (!au)
555                 return -ENOMEM;
556 
557         ret = ceph_x_build_authorizer(ac, th, au);
558         if (ret) {
559                 kfree(au);
560                 return ret;
561         }
562 
563         auth->authorizer = (struct ceph_authorizer *) au;
564         auth->authorizer_buf = au->buf->vec.iov_base;
565         auth->authorizer_buf_len = au->buf->vec.iov_len;
566         auth->authorizer_reply_buf = au->reply_buf;
567         auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
568 
569         return 0;
570 }
571 
572 static int ceph_x_update_authorizer(
573         struct ceph_auth_client *ac, int peer_type,
574         struct ceph_auth_handshake *auth)
575 {
576         struct ceph_x_authorizer *au;
577         struct ceph_x_ticket_handler *th;
578 
579         th = get_ticket_handler(ac, peer_type);
580         if (IS_ERR(th))
581                 return PTR_ERR(th);
582 
583         au = (struct ceph_x_authorizer *)auth->authorizer;
584         if (au->secret_id < th->secret_id) {
585                 dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
586                      au->service, au->secret_id, th->secret_id);
587                 return ceph_x_build_authorizer(ac, th, au);
588         }
589         return 0;
590 }
591 
592 static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
593                                           struct ceph_authorizer *a, size_t len)
594 {
595         struct ceph_x_authorizer *au = (void *)a;
596         struct ceph_x_ticket_handler *th;
597         int ret = 0;
598         struct ceph_x_authorize_reply reply;
599         void *preply = &reply;
600         void *p = au->reply_buf;
601         void *end = p + sizeof(au->reply_buf);
602 
603         th = get_ticket_handler(ac, au->service);
604         if (IS_ERR(th))
605                 return PTR_ERR(th);
606         ret = ceph_x_decrypt(&th->session_key, &p, end, &preply, sizeof(reply));
607         if (ret < 0)
608                 return ret;
609         if (ret != sizeof(reply))
610                 return -EPERM;
611 
612         if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
613                 ret = -EPERM;
614         else
615                 ret = 0;
616         dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
617              au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
618         return ret;
619 }
620 
621 static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
622                                       struct ceph_authorizer *a)
623 {
624         struct ceph_x_authorizer *au = (void *)a;
625 
626         ceph_buffer_put(au->buf);
627         kfree(au);
628 }
629 
630 
631 static void ceph_x_reset(struct ceph_auth_client *ac)
632 {
633         struct ceph_x_info *xi = ac->private;
634 
635         dout("reset\n");
636         xi->starting = true;
637         xi->server_challenge = 0;
638 }
639 
640 static void ceph_x_destroy(struct ceph_auth_client *ac)
641 {
642         struct ceph_x_info *xi = ac->private;
643         struct rb_node *p;
644 
645         dout("ceph_x_destroy %p\n", ac);
646         ceph_crypto_key_destroy(&xi->secret);
647 
648         while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
649                 struct ceph_x_ticket_handler *th =
650                         rb_entry(p, struct ceph_x_ticket_handler, node);
651                 remove_ticket_handler(ac, th);
652         }
653 
654         if (xi->auth_authorizer.buf)
655                 ceph_buffer_put(xi->auth_authorizer.buf);
656 
657         kfree(ac->private);
658         ac->private = NULL;
659 }
660 
661 static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
662                                    int peer_type)
663 {
664         struct ceph_x_ticket_handler *th;
665 
666         th = get_ticket_handler(ac, peer_type);
667         if (!IS_ERR(th))
668                 memset(&th->validity, 0, sizeof(th->validity));
669 }
670 
671 
672 static const struct ceph_auth_client_ops ceph_x_ops = {
673         .name = "x",
674         .is_authenticated = ceph_x_is_authenticated,
675         .should_authenticate = ceph_x_should_authenticate,
676         .build_request = ceph_x_build_request,
677         .handle_reply = ceph_x_handle_reply,
678         .create_authorizer = ceph_x_create_authorizer,
679         .update_authorizer = ceph_x_update_authorizer,
680         .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
681         .destroy_authorizer = ceph_x_destroy_authorizer,
682         .invalidate_authorizer = ceph_x_invalidate_authorizer,
683         .reset =  ceph_x_reset,
684         .destroy = ceph_x_destroy,
685 };
686 
687 
688 int ceph_x_init(struct ceph_auth_client *ac)
689 {
690         struct ceph_x_info *xi;
691         int ret;
692 
693         dout("ceph_x_init %p\n", ac);
694         ret = -ENOMEM;
695         xi = kzalloc(sizeof(*xi), GFP_NOFS);
696         if (!xi)
697                 goto out;
698 
699         ret = -EINVAL;
700         if (!ac->key) {
701                 pr_err("no secret set (for auth_x protocol)\n");
702                 goto out_nomem;
703         }
704 
705         ret = ceph_crypto_key_clone(&xi->secret, ac->key);
706         if (ret < 0) {
707                 pr_err("cannot clone key: %d\n", ret);
708                 goto out_nomem;
709         }
710 
711         xi->starting = true;
712         xi->ticket_handlers = RB_ROOT;
713 
714         ac->protocol = CEPH_AUTH_CEPHX;
715         ac->private = xi;
716         ac->ops = &ceph_x_ops;
717         return 0;
718 
719 out_nomem:
720         kfree(xi);
721 out:
722         return ret;
723 }
724 
725 
726 

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