linux/net/ceph/auth_x.c
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   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#define TEMP_TICKET_BUF_LEN     256
  17
  18static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
  19
  20static 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
  31static 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
  42static int ceph_x_encrypt_buflen(int ilen)
  43{
  44        return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
  45                sizeof(u32);
  46}
  47
  48static int ceph_x_encrypt(struct ceph_crypto_key *secret,
  49                          void *ibuf, int ilen, void *obuf, size_t olen)
  50{
  51        struct ceph_x_encrypt_header head = {
  52                .struct_v = 1,
  53                .magic = cpu_to_le64(CEPHX_ENC_MAGIC)
  54        };
  55        size_t len = olen - sizeof(u32);
  56        int ret;
  57
  58        ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
  59                            &head, sizeof(head), ibuf, ilen);
  60        if (ret)
  61                return ret;
  62        ceph_encode_32(&obuf, len);
  63        return len + sizeof(u32);
  64}
  65
  66static int ceph_x_decrypt(struct ceph_crypto_key *secret,
  67                          void **p, void *end, void *obuf, size_t olen)
  68{
  69        struct ceph_x_encrypt_header head;
  70        size_t head_len = sizeof(head);
  71        int len, ret;
  72
  73        len = ceph_decode_32(p);
  74        if (*p + len > end)
  75                return -EINVAL;
  76
  77        dout("ceph_x_decrypt len %d\n", len);
  78        ret = ceph_decrypt2(secret, &head, &head_len, obuf, &olen,
  79                            *p, len);
  80        if (ret)
  81                return ret;
  82        if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
  83                return -EPERM;
  84        *p += len;
  85        return olen;
  86}
  87
  88/*
  89 * get existing (or insert new) ticket handler
  90 */
  91static struct ceph_x_ticket_handler *
  92get_ticket_handler(struct ceph_auth_client *ac, int service)
  93{
  94        struct ceph_x_ticket_handler *th;
  95        struct ceph_x_info *xi = ac->private;
  96        struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
  97
  98        while (*p) {
  99                parent = *p;
 100                th = rb_entry(parent, struct ceph_x_ticket_handler, node);
 101                if (service < th->service)
 102                        p = &(*p)->rb_left;
 103                else if (service > th->service)
 104                        p = &(*p)->rb_right;
 105                else
 106                        return th;
 107        }
 108
 109        /* add it */
 110        th = kzalloc(sizeof(*th), GFP_NOFS);
 111        if (!th)
 112                return ERR_PTR(-ENOMEM);
 113        th->service = service;
 114        rb_link_node(&th->node, parent, p);
 115        rb_insert_color(&th->node, &xi->ticket_handlers);
 116        return th;
 117}
 118
 119static void remove_ticket_handler(struct ceph_auth_client *ac,
 120                                  struct ceph_x_ticket_handler *th)
 121{
 122        struct ceph_x_info *xi = ac->private;
 123
 124        dout("remove_ticket_handler %p %d\n", th, th->service);
 125        rb_erase(&th->node, &xi->ticket_handlers);
 126        ceph_crypto_key_destroy(&th->session_key);
 127        if (th->ticket_blob)
 128                ceph_buffer_put(th->ticket_blob);
 129        kfree(th);
 130}
 131
 132static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
 133                                    struct ceph_crypto_key *secret,
 134                                    void *buf, void *end)
 135{
 136        struct ceph_x_info *xi = ac->private;
 137        int num;
 138        void *p = buf;
 139        int ret;
 140        char *dbuf;
 141        char *ticket_buf;
 142        u8 reply_struct_v;
 143
 144        dbuf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
 145        if (!dbuf)
 146                return -ENOMEM;
 147
 148        ret = -ENOMEM;
 149        ticket_buf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
 150        if (!ticket_buf)
 151                goto out_dbuf;
 152
 153        ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
 154        reply_struct_v = ceph_decode_8(&p);
 155        if (reply_struct_v != 1)
 156                goto bad;
 157        num = ceph_decode_32(&p);
 158        dout("%d tickets\n", num);
 159        while (num--) {
 160                int type;
 161                u8 tkt_struct_v, blob_struct_v;
 162                struct ceph_x_ticket_handler *th;
 163                void *dp, *dend;
 164                int dlen;
 165                char is_enc;
 166                struct timespec validity;
 167                struct ceph_crypto_key old_key;
 168                void *tp, *tpend;
 169                struct ceph_timespec new_validity;
 170                struct ceph_crypto_key new_session_key;
 171                struct ceph_buffer *new_ticket_blob;
 172                unsigned long new_expires, new_renew_after;
 173                u64 new_secret_id;
 174
 175                ceph_decode_need(&p, end, sizeof(u32) + 1, bad);
 176
 177                type = ceph_decode_32(&p);
 178                dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
 179
 180                tkt_struct_v = ceph_decode_8(&p);
 181                if (tkt_struct_v != 1)
 182                        goto bad;
 183
 184                th = get_ticket_handler(ac, type);
 185                if (IS_ERR(th)) {
 186                        ret = PTR_ERR(th);
 187                        goto out;
 188                }
 189
 190                /* blob for me */
 191                dlen = ceph_x_decrypt(secret, &p, end, dbuf,
 192                                      TEMP_TICKET_BUF_LEN);
 193                if (dlen <= 0) {
 194                        ret = dlen;
 195                        goto out;
 196                }
 197                dout(" decrypted %d bytes\n", dlen);
 198                dend = dbuf + dlen;
 199                dp = dbuf;
 200
 201                tkt_struct_v = ceph_decode_8(&dp);
 202                if (tkt_struct_v != 1)
 203                        goto bad;
 204
 205                memcpy(&old_key, &th->session_key, sizeof(old_key));
 206                ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
 207                if (ret)
 208                        goto out;
 209
 210                ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
 211                ceph_decode_timespec(&validity, &new_validity);
 212                new_expires = get_seconds() + validity.tv_sec;
 213                new_renew_after = new_expires - (validity.tv_sec / 4);
 214                dout(" expires=%lu renew_after=%lu\n", new_expires,
 215                     new_renew_after);
 216
 217                /* ticket blob for service */
 218                ceph_decode_8_safe(&p, end, is_enc, bad);
 219                tp = ticket_buf;
 220                if (is_enc) {
 221                        /* encrypted */
 222                        dout(" encrypted ticket\n");
 223                        dlen = ceph_x_decrypt(&old_key, &p, end, ticket_buf,
 224                                              TEMP_TICKET_BUF_LEN);
 225                        if (dlen < 0) {
 226                                ret = dlen;
 227                                goto out;
 228                        }
 229                        dlen = ceph_decode_32(&tp);
 230                } else {
 231                        /* unencrypted */
 232                        ceph_decode_32_safe(&p, end, dlen, bad);
 233                        ceph_decode_need(&p, end, dlen, bad);
 234                        ceph_decode_copy(&p, ticket_buf, dlen);
 235                }
 236                tpend = tp + dlen;
 237                dout(" ticket blob is %d bytes\n", dlen);
 238                ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
 239                blob_struct_v = ceph_decode_8(&tp);
 240                new_secret_id = ceph_decode_64(&tp);
 241                ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
 242                if (ret)
 243                        goto out;
 244
 245                /* all is well, update our ticket */
 246                ceph_crypto_key_destroy(&th->session_key);
 247                if (th->ticket_blob)
 248                        ceph_buffer_put(th->ticket_blob);
 249                th->session_key = new_session_key;
 250                th->ticket_blob = new_ticket_blob;
 251                th->validity = new_validity;
 252                th->secret_id = new_secret_id;
 253                th->expires = new_expires;
 254                th->renew_after = new_renew_after;
 255                dout(" got ticket service %d (%s) secret_id %lld len %d\n",
 256                     type, ceph_entity_type_name(type), th->secret_id,
 257                     (int)th->ticket_blob->vec.iov_len);
 258                xi->have_keys |= th->service;
 259        }
 260
 261        ret = 0;
 262out:
 263        kfree(ticket_buf);
 264out_dbuf:
 265        kfree(dbuf);
 266        return ret;
 267
 268bad:
 269        ret = -EINVAL;
 270        goto out;
 271}
 272
 273static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
 274                                   struct ceph_x_ticket_handler *th,
 275                                   struct ceph_x_authorizer *au)
 276{
 277        int maxlen;
 278        struct ceph_x_authorize_a *msg_a;
 279        struct ceph_x_authorize_b msg_b;
 280        void *p, *end;
 281        int ret;
 282        int ticket_blob_len =
 283                (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
 284
 285        dout("build_authorizer for %s %p\n",
 286             ceph_entity_type_name(th->service), au);
 287
 288        maxlen = sizeof(*msg_a) + sizeof(msg_b) +
 289                ceph_x_encrypt_buflen(ticket_blob_len);
 290        dout("  need len %d\n", maxlen);
 291        if (au->buf && au->buf->alloc_len < maxlen) {
 292                ceph_buffer_put(au->buf);
 293                au->buf = NULL;
 294        }
 295        if (!au->buf) {
 296                au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
 297                if (!au->buf)
 298                        return -ENOMEM;
 299        }
 300        au->service = th->service;
 301
 302        msg_a = au->buf->vec.iov_base;
 303        msg_a->struct_v = 1;
 304        msg_a->global_id = cpu_to_le64(ac->global_id);
 305        msg_a->service_id = cpu_to_le32(th->service);
 306        msg_a->ticket_blob.struct_v = 1;
 307        msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
 308        msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
 309        if (ticket_blob_len) {
 310                memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
 311                       th->ticket_blob->vec.iov_len);
 312        }
 313        dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
 314             le64_to_cpu(msg_a->ticket_blob.secret_id));
 315
 316        p = msg_a + 1;
 317        p += ticket_blob_len;
 318        end = au->buf->vec.iov_base + au->buf->vec.iov_len;
 319
 320        get_random_bytes(&au->nonce, sizeof(au->nonce));
 321        msg_b.struct_v = 1;
 322        msg_b.nonce = cpu_to_le64(au->nonce);
 323        ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
 324                             p, end - p);
 325        if (ret < 0)
 326                goto out_buf;
 327        p += ret;
 328        au->buf->vec.iov_len = p - au->buf->vec.iov_base;
 329        dout(" built authorizer nonce %llx len %d\n", au->nonce,
 330             (int)au->buf->vec.iov_len);
 331        BUG_ON(au->buf->vec.iov_len > maxlen);
 332        return 0;
 333
 334out_buf:
 335        ceph_buffer_put(au->buf);
 336        au->buf = NULL;
 337        return ret;
 338}
 339
 340static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
 341                                void **p, void *end)
 342{
 343        ceph_decode_need(p, end, 1 + sizeof(u64), bad);
 344        ceph_encode_8(p, 1);
 345        ceph_encode_64(p, th->secret_id);
 346        if (th->ticket_blob) {
 347                const char *buf = th->ticket_blob->vec.iov_base;
 348                u32 len = th->ticket_blob->vec.iov_len;
 349
 350                ceph_encode_32_safe(p, end, len, bad);
 351                ceph_encode_copy_safe(p, end, buf, len, bad);
 352        } else {
 353                ceph_encode_32_safe(p, end, 0, bad);
 354        }
 355
 356        return 0;
 357bad:
 358        return -ERANGE;
 359}
 360
 361static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
 362{
 363        int want = ac->want_keys;
 364        struct ceph_x_info *xi = ac->private;
 365        int service;
 366
 367        *pneed = ac->want_keys & ~(xi->have_keys);
 368
 369        for (service = 1; service <= want; service <<= 1) {
 370                struct ceph_x_ticket_handler *th;
 371
 372                if (!(ac->want_keys & service))
 373                        continue;
 374
 375                if (*pneed & service)
 376                        continue;
 377
 378                th = get_ticket_handler(ac, service);
 379
 380                if (IS_ERR(th)) {
 381                        *pneed |= service;
 382                        continue;
 383                }
 384
 385                if (get_seconds() >= th->renew_after)
 386                        *pneed |= service;
 387                if (get_seconds() >= th->expires)
 388                        xi->have_keys &= ~service;
 389        }
 390}
 391
 392
 393static int ceph_x_build_request(struct ceph_auth_client *ac,
 394                                void *buf, void *end)
 395{
 396        struct ceph_x_info *xi = ac->private;
 397        int need;
 398        struct ceph_x_request_header *head = buf;
 399        int ret;
 400        struct ceph_x_ticket_handler *th =
 401                get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 402
 403        if (IS_ERR(th))
 404                return PTR_ERR(th);
 405
 406        ceph_x_validate_tickets(ac, &need);
 407
 408        dout("build_request want %x have %x need %x\n",
 409             ac->want_keys, xi->have_keys, need);
 410
 411        if (need & CEPH_ENTITY_TYPE_AUTH) {
 412                struct ceph_x_authenticate *auth = (void *)(head + 1);
 413                void *p = auth + 1;
 414                struct ceph_x_challenge_blob tmp;
 415                char tmp_enc[40];
 416                u64 *u;
 417
 418                if (p > end)
 419                        return -ERANGE;
 420
 421                dout(" get_auth_session_key\n");
 422                head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
 423
 424                /* encrypt and hash */
 425                get_random_bytes(&auth->client_challenge, sizeof(u64));
 426                tmp.client_challenge = auth->client_challenge;
 427                tmp.server_challenge = cpu_to_le64(xi->server_challenge);
 428                ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
 429                                     tmp_enc, sizeof(tmp_enc));
 430                if (ret < 0)
 431                        return ret;
 432
 433                auth->struct_v = 1;
 434                auth->key = 0;
 435                for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
 436                        auth->key ^= *(__le64 *)u;
 437                dout(" server_challenge %llx client_challenge %llx key %llx\n",
 438                     xi->server_challenge, le64_to_cpu(auth->client_challenge),
 439                     le64_to_cpu(auth->key));
 440
 441                /* now encode the old ticket if exists */
 442                ret = ceph_x_encode_ticket(th, &p, end);
 443                if (ret < 0)
 444                        return ret;
 445
 446                return p - buf;
 447        }
 448
 449        if (need) {
 450                void *p = head + 1;
 451                struct ceph_x_service_ticket_request *req;
 452
 453                if (p > end)
 454                        return -ERANGE;
 455                head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
 456
 457                ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
 458                if (ret)
 459                        return ret;
 460                ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
 461                                 xi->auth_authorizer.buf->vec.iov_len);
 462
 463                req = p;
 464                req->keys = cpu_to_le32(need);
 465                p += sizeof(*req);
 466                return p - buf;
 467        }
 468
 469        return 0;
 470}
 471
 472static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
 473                               void *buf, void *end)
 474{
 475        struct ceph_x_info *xi = ac->private;
 476        struct ceph_x_reply_header *head = buf;
 477        struct ceph_x_ticket_handler *th;
 478        int len = end - buf;
 479        int op;
 480        int ret;
 481
 482        if (result)
 483                return result;  /* XXX hmm? */
 484
 485        if (xi->starting) {
 486                /* it's a hello */
 487                struct ceph_x_server_challenge *sc = buf;
 488
 489                if (len != sizeof(*sc))
 490                        return -EINVAL;
 491                xi->server_challenge = le64_to_cpu(sc->server_challenge);
 492                dout("handle_reply got server challenge %llx\n",
 493                     xi->server_challenge);
 494                xi->starting = false;
 495                xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
 496                return -EAGAIN;
 497        }
 498
 499        op = le16_to_cpu(head->op);
 500        result = le32_to_cpu(head->result);
 501        dout("handle_reply op %d result %d\n", op, result);
 502        switch (op) {
 503        case CEPHX_GET_AUTH_SESSION_KEY:
 504                /* verify auth key */
 505                ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
 506                                               buf + sizeof(*head), end);
 507                break;
 508
 509        case CEPHX_GET_PRINCIPAL_SESSION_KEY:
 510                th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
 511                if (IS_ERR(th))
 512                        return PTR_ERR(th);
 513                ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
 514                                               buf + sizeof(*head), end);
 515                break;
 516
 517        default:
 518                return -EINVAL;
 519        }
 520        if (ret)
 521                return ret;
 522        if (ac->want_keys == xi->have_keys)
 523                return 0;
 524        return -EAGAIN;
 525}
 526
 527static int ceph_x_create_authorizer(
 528        struct ceph_auth_client *ac, int peer_type,
 529        struct ceph_auth_handshake *auth)
 530{
 531        struct ceph_x_authorizer *au;
 532        struct ceph_x_ticket_handler *th;
 533        int ret;
 534
 535        th = get_ticket_handler(ac, peer_type);
 536        if (IS_ERR(th))
 537                return PTR_ERR(th);
 538
 539        au = kzalloc(sizeof(*au), GFP_NOFS);
 540        if (!au)
 541                return -ENOMEM;
 542
 543        ret = ceph_x_build_authorizer(ac, th, au);
 544        if (ret) {
 545                kfree(au);
 546                return ret;
 547        }
 548
 549        auth->authorizer = (struct ceph_authorizer *) au;
 550        auth->authorizer_buf = au->buf->vec.iov_base;
 551        auth->authorizer_buf_len = au->buf->vec.iov_len;
 552        auth->authorizer_reply_buf = au->reply_buf;
 553        auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
 554
 555        return 0;
 556}
 557
 558static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
 559                                          struct ceph_authorizer *a, size_t len)
 560{
 561        struct ceph_x_authorizer *au = (void *)a;
 562        struct ceph_x_ticket_handler *th;
 563        int ret = 0;
 564        struct ceph_x_authorize_reply reply;
 565        void *p = au->reply_buf;
 566        void *end = p + sizeof(au->reply_buf);
 567
 568        th = get_ticket_handler(ac, au->service);
 569        if (IS_ERR(th))
 570                return PTR_ERR(th);
 571        ret = ceph_x_decrypt(&th->session_key, &p, end, &reply, sizeof(reply));
 572        if (ret < 0)
 573                return ret;
 574        if (ret != sizeof(reply))
 575                return -EPERM;
 576
 577        if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
 578                ret = -EPERM;
 579        else
 580                ret = 0;
 581        dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
 582             au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
 583        return ret;
 584}
 585
 586static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
 587                                      struct ceph_authorizer *a)
 588{
 589        struct ceph_x_authorizer *au = (void *)a;
 590
 591        ceph_buffer_put(au->buf);
 592        kfree(au);
 593}
 594
 595
 596static void ceph_x_reset(struct ceph_auth_client *ac)
 597{
 598        struct ceph_x_info *xi = ac->private;
 599
 600        dout("reset\n");
 601        xi->starting = true;
 602        xi->server_challenge = 0;
 603}
 604
 605static void ceph_x_destroy(struct ceph_auth_client *ac)
 606{
 607        struct ceph_x_info *xi = ac->private;
 608        struct rb_node *p;
 609
 610        dout("ceph_x_destroy %p\n", ac);
 611        ceph_crypto_key_destroy(&xi->secret);
 612
 613        while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
 614                struct ceph_x_ticket_handler *th =
 615                        rb_entry(p, struct ceph_x_ticket_handler, node);
 616                remove_ticket_handler(ac, th);
 617        }
 618
 619        if (xi->auth_authorizer.buf)
 620                ceph_buffer_put(xi->auth_authorizer.buf);
 621
 622        kfree(ac->private);
 623        ac->private = NULL;
 624}
 625
 626static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
 627                                   int peer_type)
 628{
 629        struct ceph_x_ticket_handler *th;
 630
 631        th = get_ticket_handler(ac, peer_type);
 632        if (!IS_ERR(th))
 633                remove_ticket_handler(ac, th);
 634}
 635
 636
 637static const struct ceph_auth_client_ops ceph_x_ops = {
 638        .name = "x",
 639        .is_authenticated = ceph_x_is_authenticated,
 640        .should_authenticate = ceph_x_should_authenticate,
 641        .build_request = ceph_x_build_request,
 642        .handle_reply = ceph_x_handle_reply,
 643        .create_authorizer = ceph_x_create_authorizer,
 644        .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
 645        .destroy_authorizer = ceph_x_destroy_authorizer,
 646        .invalidate_authorizer = ceph_x_invalidate_authorizer,
 647        .reset =  ceph_x_reset,
 648        .destroy = ceph_x_destroy,
 649};
 650
 651
 652int ceph_x_init(struct ceph_auth_client *ac)
 653{
 654        struct ceph_x_info *xi;
 655        int ret;
 656
 657        dout("ceph_x_init %p\n", ac);
 658        ret = -ENOMEM;
 659        xi = kzalloc(sizeof(*xi), GFP_NOFS);
 660        if (!xi)
 661                goto out;
 662
 663        ret = -EINVAL;
 664        if (!ac->key) {
 665                pr_err("no secret set (for auth_x protocol)\n");
 666                goto out_nomem;
 667        }
 668
 669        ret = ceph_crypto_key_clone(&xi->secret, ac->key);
 670        if (ret < 0) {
 671                pr_err("cannot clone key: %d\n", ret);
 672                goto out_nomem;
 673        }
 674
 675        xi->starting = true;
 676        xi->ticket_handlers = RB_ROOT;
 677
 678        ac->protocol = CEPH_AUTH_CEPHX;
 679        ac->private = xi;
 680        ac->ops = &ceph_x_ops;
 681        return 0;
 682
 683out_nomem:
 684        kfree(xi);
 685out:
 686        return ret;
 687}
 688
 689
 690
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