lustre/sec/gss/sec_gss.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Modifications for Lustre
   5  * Copyright 2004, Cluster File Systems, Inc.
   6  * All rights reserved
   7  * Author: Eric Mei <ericm@clusterfs.com>
   8  */
   9
  10 /*
  11  * linux/net/sunrpc/auth_gss.c
  12  *
  13  * RPCSEC_GSS client authentication.
  14  *
  15  *  Copyright (c) 2000 The Regents of the University of Michigan.
  16  *  All rights reserved.
  17  *
  18  *  Dug Song       <dugsong@monkey.org>
  19  *  Andy Adamson   <andros@umich.edu>
  20  *
  21  *  Redistribution and use in source and binary forms, with or without
  22  *  modification, are permitted provided that the following conditions
  23  *  are met:
  24  *
  25  *  1. Redistributions of source code must retain the above copyright
  26  *     notice, this list of conditions and the following disclaimer.
  27  *  2. Redistributions in binary form must reproduce the above copyright
  28  *     notice, this list of conditions and the following disclaimer in the
  29  *     documentation and/or other materials provided with the distribution.
  30  *  3. Neither the name of the University nor the names of its
  31  *     contributors may be used to endorse or promote products derived
  32  *     from this software without specific prior written permission.
  33  *
  34  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  35  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  36  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  37  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  38  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  39  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  40  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  41  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  42  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  43  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  44  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 #ifndef EXPORT_SYMTAB
  49 # define EXPORT_SYMTAB
  50 #endif
  51 #define DEBUG_SUBSYSTEM S_SEC
  52 #ifdef __KERNEL__
  53 #include <linux/init.h>
  54 #include <linux/module.h>
  55 #include <linux/slab.h>
  56 #include <linux/dcache.h>
  57 #include <linux/fs.h>
  58 #include <linux/random.h>
  59 /* for rpc_pipefs */
  60 struct rpc_clnt;
  61 #include <linux/sunrpc/rpc_pipe_fs.h>
  62 #else
  63 #include <liblustre.h>
  64 #endif
  65
  66 #include <libcfs/kp30.h>
  67 #include <linux/obd.h>
  68 #include <linux/obd_class.h>
  69 #include <linux/obd_support.h>
  70 #include <linux/lustre_idl.h>
  71 #include <linux/lustre_net.h>
  72 #include <linux/lustre_import.h>
  73 #include <linux/lustre_sec.h>
  74
  75 #include "gss_err.h"
  76 #include "gss_internal.h"
  77 #include "gss_api.h"
  78
  79 #define GSS_CREDCACHE_EXPIRE    (60)               /* 1 minute */
  80 #define GSS_CRED_EXPIRE         (8 * 60 * 60)      /* 8 hours */
  81 #define GSS_CRED_SIGN_SIZE      (1024)
  82 #define GSS_CRED_VERIFY_SIZE    (56)
  83
  84 #define LUSTRE_PIPEDIR          "/lustre"
  85
  86 /**********************************************
  87  * gss security init/fini helper              *
  88  **********************************************/
  89
  90 #define SECINIT_RPC_TIMEOUT     (10)
  91 #define SECFINI_RPC_TIMEOUT     (10)
  92
  93 static int secinit_compose_request(struct obd_import *imp,
  94                                    char *buf, int bufsize,
  95                                    uid_t uid, gid_t gid,
  96                                    long token_size,
  97                                    char __user *token)
  98 {
  99         struct ptlrpcs_wire_hdr *hdr;
 100         struct lustre_msg       *lmsg;
 101         struct mds_req_sec_desc *secdesc;
 102         __u32                    size = sizeof(*secdesc);
 103         __u32                    lmsg_size, *p;
 104         int                      rc;
 105
 106         lmsg_size = lustre_msg_size(1, &size);
 107
 108         if (sizeof(*hdr) + lmsg_size + size_round(token_size) > bufsize) {
 109                 CERROR("token size %ld too large\n", token_size);
 110                 return -EINVAL;
 111         }
 112
 113         /* security wire hdr */
 114         hdr = buf_to_sec_hdr(buf);
 115         hdr->flavor  = cpu_to_le32(PTLRPC_SEC_GSS);
 116         hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_NONE);
 117         hdr->msg_len = cpu_to_le32(lmsg_size);
 118         hdr->sec_len = cpu_to_le32(7 * 4 + token_size);
 119
 120         /* lustre message & secdesc */
 121         lmsg = buf_to_lustre_msg(buf);
 122
 123         lustre_init_msg(lmsg, 1, &size, NULL);
 124         secdesc = lustre_msg_buf(lmsg, 0, size);
 125         secdesc->rsd_uid = secdesc->rsd_fsuid = uid;
 126         secdesc->rsd_gid = secdesc->rsd_fsgid = gid;
 127         secdesc->rsd_cap = secdesc->rsd_ngroups = 0;
 128
 129         lmsg->handle   = imp->imp_remote_handle;
 130         lmsg->type     = PTL_RPC_MSG_REQUEST;
 131         lmsg->opc      = SEC_INIT;
 132         lmsg->flags    = 0;
 133         lmsg->conn_cnt = imp->imp_conn_cnt;
 134
 135         p = (__u32 *) (buf + sizeof(*hdr) + lmsg_size);
 136
 137         /* gss hdr */
 138         *p++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);     /* gss version */
 139         *p++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);       /* subflavor */
 140         *p++ = cpu_to_le32(PTLRPC_GSS_PROC_INIT);       /* proc */
 141         *p++ = cpu_to_le32(0);                          /* seq */
 142         *p++ = cpu_to_le32(PTLRPC_GSS_SVC_NONE);        /* service */
 143         *p++ = cpu_to_le32(0);                          /* context handle */
 144
 145         /* now the token part */
 146         *p++ = cpu_to_le32((__u32) token_size);
 147         LASSERT(((char *)p - buf) + token_size <= bufsize);
 148
 149         rc = copy_from_user(p, token, token_size);
 150         if (rc) {
 151                 CERROR("can't copy token\n");
 152                 return -EFAULT;
 153         }
 154
 155         rc = size_round(((char *)p - buf) + token_size);
 156         return rc;
 157 }
 158
 159 static int secinit_parse_reply(char *repbuf, int replen,
 160                                char __user *outbuf, long outlen)
 161 {
 162         __u32                   *p = (__u32 *)repbuf;
 163         struct ptlrpcs_wire_hdr *hdr = (struct ptlrpcs_wire_hdr *) repbuf;
 164         __u32                    lmsg_len, sec_len, status;
 165         __u32                    major, minor, seq, obj_len, round_len;
 166         __u32                    effective = 0;
 167
 168         if (replen <= (4 + 6) * 4) {
 169                 CERROR("reply size %d too small\n", replen);
 170                 return -EINVAL;
 171         }
 172
 173         hdr->flavor = le32_to_cpu(hdr->flavor);
 174         hdr->sectype = le32_to_cpu(hdr->sectype);
 175         hdr->msg_len = le32_to_cpu(hdr->msg_len);
 176         hdr->sec_len = le32_to_cpu(hdr->sec_len);
 177
 178         lmsg_len = le32_to_cpu(p[2]);
 179         sec_len = le32_to_cpu(p[3]);
 180
 181         /* sanity checks */
 182         if (hdr->flavor != PTLRPC_SEC_GSS ||
 183             hdr->sectype != PTLRPC_SEC_TYPE_NONE) {
 184                 CERROR("unexpected reply\n");
 185                 return -EINVAL;
 186         }
 187         if (hdr->msg_len % 8 ||
 188             sizeof(*hdr) + hdr->msg_len + hdr->sec_len > replen) {
 189                 CERROR("unexpected reply\n");
 190                 return -EINVAL;
 191         }
 192         if (hdr->sec_len > outlen) {
 193                 CERROR("outbuf too small\n");
 194                 return -EINVAL;
 195         }
 196
 197         p = (__u32 *) buf_to_sec_data(repbuf);
 198         effective = 0;
 199
 200         status = le32_to_cpu(*p++);
 201         major = le32_to_cpu(*p++);
 202         minor = le32_to_cpu(*p++);
 203         seq = le32_to_cpu(*p++);
 204         effective += 4 * 4;
 205
 206         if (copy_to_user(outbuf, &status, 4))
 207                 return -EFAULT;
 208         outbuf += 4;
 209         if (copy_to_user(outbuf, &major, 4))
 210                 return -EFAULT;
 211         outbuf += 4;
 212         if (copy_to_user(outbuf, &minor, 4))
 213                 return -EFAULT;
 214         outbuf += 4;
 215         if (copy_to_user(outbuf, &seq, 4))
 216                 return -EFAULT;
 217         outbuf += 4;
 218
 219         obj_len = le32_to_cpu(*p++);
 220         round_len = (obj_len + 3) & ~ 3;
 221         if (copy_to_user(outbuf, &obj_len, 4))
 222                 return -EFAULT;
 223         outbuf += 4;
 224         if (copy_to_user(outbuf, (char *)p, round_len))
 225                 return -EFAULT;
 226         p += round_len / 4;
 227         outbuf += round_len;
 228         effective += 4 + round_len;
 229
 230         obj_len = le32_to_cpu(*p++);
 231         round_len = (obj_len + 3) & ~ 3;
 232         if (copy_to_user(outbuf, &obj_len, 4))
 233                 return -EFAULT;
 234         outbuf += 4;
 235         if (copy_to_user(outbuf, (char *)p, round_len))
 236                 return -EFAULT;
 237         p += round_len / 4;
 238         outbuf += round_len;
 239         effective += 4 + round_len;
 240
 241         return effective;
 242 }
 243
 244 /* XXX move to where lgssd could see */
 245 struct lgssd_ioctl_param {
 246         int             version;        /* in   */
 247         char           *uuid;           /* in   */
 248         uid_t           uid;            /* in   */
 249         gid_t           gid;            /* in   */
 250         long            send_token_size;/* in   */
 251         char           *send_token;     /* in   */
 252         long            reply_buf_size; /* in   */
 253         char           *reply_buf;      /* in   */
 254         long            status;         /* out  */
 255         long            reply_length;   /* out  */
 256 };
 257
 258 static int gss_send_secinit_rpc(__user char *buffer, unsigned long count)
 259 {
 260         struct obd_import        *imp;
 261         struct lgssd_ioctl_param  param;
 262         const int                 reqbuf_size = 1024;
 263         const int                 repbuf_size = 1024;
 264         char                     *reqbuf, *repbuf;
 265         struct obd_device        *obd;
 266         char                      obdname[64];
 267         long                      lsize;
 268         int                       rc, reqlen, replen;
 269
 270         if (count != sizeof(param)) {
 271                 CERROR("partial write\n");
 272                 RETURN(-EINVAL);
 273         }
 274         if (copy_from_user(&param, buffer, sizeof(param)))
 275                 RETURN(-EFAULT);
 276
 277         if (param.version != GSSD_INTERFACE_VERSION) {
 278                 CERROR("gssd interface version %d (expect %d)\n",
 279                         param.version, GSSD_INTERFACE_VERSION);
 280                 RETURN(-EINVAL);
 281         }
 282
 283         /* take name */
 284         if (strncpy_from_user(obdname, param.uuid,
 285                               sizeof(obdname)) <= 0) {
 286                 CERROR("Invalid obdname pointer\n");
 287                 RETURN(-EFAULT);
 288         }
 289
 290         obd = class_name2obd(obdname);
 291         if (!obd) {
 292                 CERROR("no such obd %s\n", obdname);
 293                 RETURN(-EINVAL);
 294         }
 295         if (strcmp(obd->obd_type->typ_name, "mdc") &&
 296             strcmp(obd->obd_type->typ_name, "osc")) {
 297                 CERROR("%s not a mdc/osc device\n", obdname);
 298                 RETURN(-EINVAL);
 299         }
 300
 301         imp = class_import_get(obd->u.cli.cl_import);
 302
 303         OBD_ALLOC(reqbuf, reqbuf_size);
 304         OBD_ALLOC(repbuf, reqbuf_size);
 305
 306         if (!reqbuf || !repbuf) {
 307                 CERROR("Can't alloc buffer: %p/%p\n", reqbuf, repbuf);
 308                 param.status = -ENOMEM;
 309                 goto out_copy;
 310         }
 311
 312         /* get token */
 313         reqlen = secinit_compose_request(imp, reqbuf, reqbuf_size,
 314                                          param.uid, param.gid,
 315                                          param.send_token_size,
 316                                          param.send_token);
 317         if (reqlen < 0) {
 318                 param.status = reqlen;
 319                 goto out_copy;
 320         }
 321
 322         replen = repbuf_size;
 323         rc = ptlrpc_do_rawrpc(imp, reqbuf, reqlen,
 324                               repbuf, &replen, SECINIT_RPC_TIMEOUT);
 325         if (rc) {
 326                 param.status = rc;
 327                 goto out_copy;
 328         }
 329
 330         if (replen > param.reply_buf_size) {
 331                 CERROR("output buffer size %ld too small, need %d\n",
 332                         param.reply_buf_size, replen);
 333                 param.status = -EINVAL;
 334                 goto out_copy;
 335         }
 336
 337         lsize = secinit_parse_reply(repbuf, replen,
 338                                     param.reply_buf, param.reply_buf_size);
 339         if (lsize < 0) {
 340                 param.status = (int) lsize;
 341                 goto out_copy;
 342         }
 343
 344         param.status = 0;
 345         param.reply_length = lsize;
 346
 347 out_copy:
 348         if (copy_to_user(buffer, &param, sizeof(param)))
 349                 rc = -EFAULT;
 350         else
 351                 rc = 0;
 352
 353         class_import_put(imp);
 354         if (repbuf)
 355                 OBD_FREE(repbuf, repbuf_size);
 356         if (reqbuf)
 357                 OBD_FREE(reqbuf, reqbuf_size);
 358         RETURN(rc);
 359 }
 360
 361 static int gss_send_secfini_rpc(struct obd_import *imp,
 362                                 char *reqbuf, int reqlen)
 363 {
 364         const int repbuf_size = 1024;
 365         char *repbuf;
 366         int replen = repbuf_size;
 367         int rc;
 368
 369         OBD_ALLOC(repbuf, repbuf_size);
 370         if (!repbuf) {
 371                 CERROR("Out of memory\n");
 372                 return -ENOMEM;
 373         }
 374
 375         rc = ptlrpc_do_rawrpc(imp, reqbuf, reqlen, repbuf, &replen,
 376                               SECFINI_RPC_TIMEOUT);
 377
 378         OBD_FREE(repbuf, repbuf_size);
 379         return rc;
 380 }
 381
 382 /**********************************************
 383  * structure definitions                      *
 384  **********************************************/
 385 struct gss_sec {
 386         struct ptlrpc_sec       gs_base;
 387         struct gss_api_mech    *gs_mech;
 388 #ifdef __KERNEL__
 389         spinlock_t              gs_lock;
 390         struct list_head        gs_upcalls;
 391         char                   *gs_pipepath;
 392         struct dentry          *gs_depipe;
 393 #endif
 394 };
 395
 396 #ifdef __KERNEL__
 397
 398 static rwlock_t gss_ctx_lock = RW_LOCK_UNLOCKED;
 399
 400 struct gss_upcall_msg_data {
 401         __u32                           gum_uid;
 402         __u32                           gum_svc;
 403         __u32                           gum_nal;
 404         __u32                           gum_netid;
 405         __u64                           gum_nid;
 406 };
 407
 408 struct gss_upcall_msg {
 409         struct rpc_pipe_msg             gum_base;
 410         atomic_t                        gum_refcount;
 411         struct list_head                gum_list;
 412         struct gss_sec                 *gum_gsec;
 413         wait_queue_head_t               gum_waitq;
 414         char                            gum_obdname[64];
 415         struct gss_upcall_msg_data      gum_data;
 416 };
 417
 418 /**********************************************
 419  * rpc_pipe upcall helpers                    *
 420  **********************************************/
 421 static
 422 void gss_release_msg(struct gss_upcall_msg *gmsg)
 423 {
 424         ENTRY;
 425         LASSERT(atomic_read(&gmsg->gum_refcount) > 0);
 426
 427         if (!atomic_dec_and_test(&gmsg->gum_refcount)) {
 428                 CDEBUG(D_SEC, "gmsg %p ref %d\n", gmsg,
 429                        atomic_read(&gmsg->gum_refcount));
 430                 EXIT;
 431                 return;
 432         }
 433         LASSERT(list_empty(&gmsg->gum_list));
 434         LASSERT(list_empty(&gmsg->gum_base.list));
 435         OBD_FREE(gmsg, sizeof(*gmsg));
 436         EXIT;
 437 }
 438
 439 static void
 440 gss_unhash_msg_nolock(struct gss_upcall_msg *gmsg)
 441 {
 442         ENTRY;
 443         if (list_empty(&gmsg->gum_list)) {
 444                 EXIT;
 445                 return;
 446         }
 447
 448         list_del_init(&gmsg->gum_list);
 449         wake_up(&gmsg->gum_waitq);
 450         atomic_dec(&gmsg->gum_refcount);
 451         CDEBUG(D_SEC, "gmsg %p refcount now %d\n",
 452                gmsg, atomic_read(&gmsg->gum_refcount));
 453         LASSERT(atomic_read(&gmsg->gum_refcount) > 0);
 454         EXIT;
 455 }
 456
 457 static void
 458 gss_unhash_msg(struct gss_upcall_msg *gmsg)
 459 {
 460         struct gss_sec *gsec = gmsg->gum_gsec;
 461
 462         spin_lock(&gsec->gs_lock);
 463         gss_unhash_msg_nolock(gmsg);
 464         spin_unlock(&gsec->gs_lock);
 465 }
 466
 467 static
 468 struct gss_upcall_msg * gss_find_upcall(struct gss_sec *gsec,
 469                                         char *obdname,
 470                                         struct gss_upcall_msg_data *gmd)
 471 {
 472         struct gss_upcall_msg *gmsg;
 473         ENTRY;
 474
 475         list_for_each_entry(gmsg, &gsec->gs_upcalls, gum_list) {
 476                 if (memcmp(&gmsg->gum_data, gmd, sizeof(*gmd)))
 477                         continue;
 478                 if (strcmp(gmsg->gum_obdname, obdname))
 479                         continue;
 480                 atomic_inc(&gmsg->gum_refcount);
 481                 CDEBUG(D_SEC, "found gmsg at %p: obdname %s, uid %d, ref %d\n",
 482                        gmsg, obdname, gmd->gum_uid,
 483                        atomic_read(&gmsg->gum_refcount));
 484                 RETURN(gmsg);
 485         }
 486         RETURN(NULL);
 487 }
 488
 489 static void gss_init_upcall_msg(struct gss_upcall_msg *gmsg,
 490                                 struct gss_sec *gsec, char *obdname,
 491                                 struct gss_upcall_msg_data *gmd)
 492 {
 493         struct rpc_pipe_msg *rpcmsg;
 494         ENTRY;
 495
 496         /* 2 refs: 1 for hash, 1 for current user */
 497         init_waitqueue_head(&gmsg->gum_waitq);
 498         list_add(&gmsg->gum_list, &gsec->gs_upcalls);
 499         atomic_set(&gmsg->gum_refcount, 2);
 500         gmsg->gum_gsec = gsec;
 501         strncpy(gmsg->gum_obdname, obdname, sizeof(gmsg->gum_obdname));
 502         memcpy(&gmsg->gum_data, gmd, sizeof(*gmd));
 503
 504         rpcmsg = &gmsg->gum_base;
 505         rpcmsg->data = &gmsg->gum_data;
 506         rpcmsg->len = sizeof(gmsg->gum_data);
 507         EXIT;
 508 }
 509 #endif /* __KERNEL__ */
 510
 511 /********************************************
 512  * gss cred manipulation helpers            *
 513  ********************************************/
 514 static
 515 int gss_cred_is_uptodate_ctx(struct ptlrpc_cred *cred)
 516 {
 517         struct gss_cred *gcred = container_of(cred, struct gss_cred, gc_base);
 518         int res = 0;
 519
 520         read_lock(&gss_ctx_lock);
 521         if ((cred->pc_flags & PTLRPC_CRED_UPTODATE) && gcred->gc_ctx)
 522                 res = 1;
 523         read_unlock(&gss_ctx_lock);
 524         return res;
 525 }
 526
 527 static inline
 528 struct gss_cl_ctx * gss_get_ctx(struct gss_cl_ctx *ctx)
 529 {
 530         atomic_inc(&ctx->gc_refcount);
 531         return ctx;
 532 }
 533
 534 static
 535 void gss_destroy_ctx(struct gss_cl_ctx *ctx)
 536 {
 537         ENTRY;
 538
 539         CDEBUG(D_SEC, "destroy cl_ctx %p\n", ctx);
 540         if (ctx->gc_gss_ctx)
 541                 kgss_delete_sec_context(&ctx->gc_gss_ctx);
 542
 543         if (ctx->gc_wire_ctx.len > 0) {
 544                 OBD_FREE(ctx->gc_wire_ctx.data, ctx->gc_wire_ctx.len);
 545                 ctx->gc_wire_ctx.len = 0;
 546         }
 547
 548         OBD_FREE(ctx, sizeof(*ctx));
 549 }
 550
 551 static
 552 void gss_put_ctx(struct gss_cl_ctx *ctx)
 553 {
 554         if (atomic_dec_and_test(&ctx->gc_refcount))
 555                 gss_destroy_ctx(ctx);
 556 }
 557
 558 static
 559 struct gss_cl_ctx *gss_cred_get_ctx(struct ptlrpc_cred *cred)
 560 {
 561         struct gss_cred *gcred = container_of(cred, struct gss_cred, gc_base);
 562         struct gss_cl_ctx *ctx = NULL;
 563
 564         read_lock(&gss_ctx_lock);
 565         if (gcred->gc_ctx)
 566                 ctx = gss_get_ctx(gcred->gc_ctx);
 567         read_unlock(&gss_ctx_lock);
 568         return ctx;
 569 }
 570
 571 static
 572 void gss_cred_set_ctx(struct ptlrpc_cred *cred, struct gss_cl_ctx *ctx)
 573 {
 574         struct gss_cred *gcred = container_of(cred, struct gss_cred, gc_base);
 575         struct gss_cl_ctx *old;
 576         __u64 ctx_expiry;
 577         ENTRY;
 578
 579         if (kgss_inquire_context(ctx->gc_gss_ctx, &ctx_expiry)) {
 580                 CERROR("unable to get expire time\n");
 581                 ctx_expiry = 1; /* make it expired now */
 582         }
 583         cred->pc_expire = (unsigned long) ctx_expiry;
 584
 585         write_lock(&gss_ctx_lock);
 586         old = gcred->gc_ctx;
 587         gcred->gc_ctx = ctx;
 588         cred->pc_flags |= PTLRPC_CRED_UPTODATE;
 589         write_unlock(&gss_ctx_lock);
 590         if (old)
 591                 gss_put_ctx(old);
 592
 593         CWARN("client refreshed gss cred %p(uid %u)\n", cred, cred->pc_uid);
 594         EXIT;
 595 }
 596
 597 static int
 598 simple_get_bytes(char **buf, __u32 *buflen, void *res, __u32 reslen)
 599 {
 600         if (*buflen < reslen) {
 601                 CERROR("buflen %u < %u\n", *buflen, reslen);
 602                 return -EINVAL;
 603         }
 604
 605         memcpy(res, *buf, reslen);
 606         *buf += reslen;
 607         *buflen -= reslen;
 608         return 0;
 609 }
 610
 611 /* data passed down:
 612  *  - uid
 613  *  - timeout
 614  *  - gc_win / error
 615  *  - wire_ctx (rawobj)
 616  *  - mech_ctx? (rawobj)
 617  */
 618 static
 619 int gss_parse_init_downcall(struct gss_api_mech *gm, rawobj_t *buf,
 620                             struct gss_cl_ctx **gc,
 621                             struct gss_upcall_msg_data *gmd, int *gss_err)
 622 {
 623         char *p = buf->data;
 624         __u32 len = buf->len;
 625         struct gss_cl_ctx *ctx;
 626         rawobj_t tmp_buf;
 627         unsigned int timeout;
 628         int err = -EPERM;
 629         ENTRY;
 630
 631         *gc = NULL;
 632         *gss_err = 0;
 633
 634         OBD_ALLOC(ctx, sizeof(*ctx));
 635         if (!ctx)
 636                 RETURN(-ENOMEM);
 637
 638         ctx->gc_proc = RPC_GSS_PROC_DATA;
 639         ctx->gc_seq = 0;
 640         spin_lock_init(&ctx->gc_seq_lock);
 641         atomic_set(&ctx->gc_refcount,1);
 642
 643         if (simple_get_bytes(&p, &len, &gmd->gum_uid, sizeof(gmd->gum_uid)))
 644                 goto err_free_ctx;
 645         if (simple_get_bytes(&p, &len, &gmd->gum_svc, sizeof(gmd->gum_svc)))
 646                 goto err_free_ctx;
 647         if (simple_get_bytes(&p, &len, &gmd->gum_nal, sizeof(gmd->gum_nal)))
 648                 goto err_free_ctx;
 649         if (simple_get_bytes(&p, &len, &gmd->gum_netid, sizeof(gmd->gum_netid)))
 650                 goto err_free_ctx;
 651         if (simple_get_bytes(&p, &len, &gmd->gum_nid, sizeof(gmd->gum_nid)))
 652                 goto err_free_ctx;
 653         /* FIXME: discarded timeout for now */
 654         if (simple_get_bytes(&p, &len, &timeout, sizeof(timeout)))
 655                 goto err_free_ctx;
 656         if (simple_get_bytes(&p, &len, &ctx->gc_win, sizeof(ctx->gc_win)))
 657                 goto err_free_ctx;
 658
 659         /* lgssd signals an error by passing ctx->gc_win = 0: */
 660         if (!ctx->gc_win) {
 661                 /* in which case the next 2 int are:
 662                  * - rpc error
 663                  * - gss error
 664                  */
 665                 if (simple_get_bytes(&p, &len, &err, sizeof(err))) {
 666                         err = -EPERM;
 667                         goto err_free_ctx;
 668                 }
 669                 if (simple_get_bytes(&p, &len, gss_err, sizeof(*gss_err))) {
 670                         err = -EPERM;
 671                         goto err_free_ctx;
 672                 }
 673                 if (err == 0 && *gss_err == 0) {
 674                         CERROR("no error passed from downcall\n");
 675                         err = -EPERM;
 676                 }
 677                 goto err_free_ctx;
 678         }
 679
 680         if (rawobj_extract_local(&tmp_buf, (__u32 **) ((void *)&p), &len))
 681                 goto err_free_ctx;
 682         if (rawobj_dup(&ctx->gc_wire_ctx, &tmp_buf)) {
 683                 err = -ENOMEM;
 684                 goto err_free_ctx;
 685         }
 686         if (rawobj_extract_local(&tmp_buf, (__u32 **) ((void *)&p), &len))
 687                 goto err_free_wire_ctx;
 688         if (len) {
 689                 CERROR("unexpected trailing %u bytes\n", len);
 690                 goto err_free_wire_ctx;
 691         }
 692         if (kgss_import_sec_context(&tmp_buf, gm, &ctx->gc_gss_ctx))
 693                 goto err_free_wire_ctx;
 694
 695         *gc = ctx;
 696         RETURN(0);
 697
 698 err_free_wire_ctx:
 699         if (ctx->gc_wire_ctx.data)
 700                 OBD_FREE(ctx->gc_wire_ctx.data, ctx->gc_wire_ctx.len);
 701 err_free_ctx:
 702         OBD_FREE(ctx, sizeof(*ctx));
 703         CDEBUG(D_SEC, "err_code %d, gss code %d\n", err, *gss_err);
 704         return err;
 705 }
 706
 707 /***************************************
 708  * cred APIs                           *
 709  ***************************************/
 710 #ifdef __KERNEL__
 711 #define CRED_REFRESH_UPCALL_TIMEOUT     (20)
 712 static int gss_cred_refresh(struct ptlrpc_cred *cred)
 713 {
 714         struct obd_import          *import;
 715         struct gss_sec             *gsec;
 716         struct gss_upcall_msg      *gss_msg, *gss_new;
 717         struct gss_upcall_msg_data  gmd;
 718         struct dentry              *dentry;
 719         char                       *obdname, *obdtype;
 720         wait_queue_t                wait;
 721         uid_t                       uid = cred->pc_uid;
 722         int                         res;
 723         ENTRY;
 724
 725         if (ptlrpcs_cred_is_uptodate(cred))
 726                 RETURN(0);
 727
 728         LASSERT(cred->pc_sec);
 729         LASSERT(cred->pc_sec->ps_import);
 730         LASSERT(cred->pc_sec->ps_import->imp_obd);
 731
 732         import = cred->pc_sec->ps_import;
 733         if (!import->imp_connection) {
 734                 CERROR("import has no connection set\n");
 735                 RETURN(-EINVAL);
 736         }
 737
 738         gmd.gum_uid = uid;
 739         gmd.gum_nal = import->imp_connection->c_peer.peer_ni->pni_number;
 740         gmd.gum_netid = 0;
 741         gmd.gum_nid = import->imp_connection->c_peer.peer_id.nid;
 742
 743         obdtype = import->imp_obd->obd_type->typ_name;
 744         if (!strcmp(obdtype, "mdc"))
 745                 gmd.gum_svc = 0;
 746         else if (!strcmp(obdtype, "osc"))
 747                 gmd.gum_svc = 1;
 748         else {
 749                 CERROR("gss on %s?\n", obdtype);
 750                 RETURN(-EINVAL);
 751         }
 752
 753         gsec = container_of(cred->pc_sec, struct gss_sec, gs_base);
 754         obdname = import->imp_obd->obd_name;
 755         dentry = gsec->gs_depipe;
 756         gss_new = NULL;
 757         res = 0;
 758
 759         CWARN("Initiate gss context %p(%u@%s)\n",
 760                container_of(cred, struct gss_cred, gc_base),
 761                uid, import->imp_target_uuid.uuid);
 762
 763 again:
 764         spin_lock(&gsec->gs_lock);
 765         gss_msg = gss_find_upcall(gsec, obdname, &gmd);
 766         if (gss_msg) {
 767                 if (gss_new) {
 768                         OBD_FREE(gss_new, sizeof(*gss_new));
 769                         gss_new = NULL;
 770                 }
 771                 GOTO(waiting, res);
 772         }
 773
 774         if (!gss_new) {
 775                 spin_unlock(&gsec->gs_lock);
 776                 OBD_ALLOC(gss_new, sizeof(*gss_new));
 777                 if (!gss_new)
 778                         RETURN(-ENOMEM);
 779                 goto again;
 780         }
 781         /* so far we'v created gss_new */
 782         gss_init_upcall_msg(gss_new, gsec, obdname, &gmd);
 783
 784         if (gss_cred_is_uptodate_ctx(cred)) {
 785                 /* someone else had done it for us, simply cancel
 786                  * our own upcall */
 787                 CDEBUG(D_SEC, "cred("LPU64"/%u) has been refreshed by someone "
 788                        "else, simply drop our request\n",
 789                        cred->pc_pag, cred->pc_uid);
 790                 gss_unhash_msg_nolock(gss_new);
 791                 spin_unlock(&gsec->gs_lock);
 792                 gss_release_msg(gss_new);
 793                 RETURN(0);
 794         }
 795
 796         /* need to make upcall now */
 797         spin_unlock(&gsec->gs_lock);
 798         res = rpc_queue_upcall(dentry->d_inode, &gss_new->gum_base);
 799         if (res) {
 800                 CERROR("rpc_queue_upcall failed: %d\n", res);
 801                 gss_unhash_msg(gss_new);
 802                 gss_release_msg(gss_new);
 803                 cred->pc_flags |= PTLRPC_CRED_ERROR;
 804                 RETURN(res);
 805         }
 806         gss_msg = gss_new;
 807         spin_lock(&gsec->gs_lock);
 808
 809 waiting:
 810         /* upcall might finish quickly */
 811         if (list_empty(&gss_msg->gum_list)) {
 812                 spin_unlock(&gsec->gs_lock);
 813                 res = 0;
 814                 goto out;
 815         }
 816
 817         init_waitqueue_entry(&wait, current);
 818         set_current_state(TASK_INTERRUPTIBLE);
 819         add_wait_queue(&gss_msg->gum_waitq, &wait);
 820         spin_unlock(&gsec->gs_lock);
 821
 822         res = schedule_timeout(CRED_REFRESH_UPCALL_TIMEOUT * HZ);
 823         remove_wait_queue(&gss_msg->gum_waitq, &wait);
 824
 825         if (signal_pending(current)) {
 826                 CERROR("cred %p: interrupted upcall\n", cred);
 827                 if (gss_new)
 828                         cred->pc_flags |= PTLRPC_CRED_DEAD | PTLRPC_CRED_ERROR;
 829                 res = -EINTR;
 830         } else if (res == 0) {
 831                 CERROR("cred %p: upcall timedout\n", cred);
 832                 cred->pc_flags |= PTLRPC_CRED_DEAD | PTLRPC_CRED_ERROR;
 833                 res = -ETIMEDOUT;
 834         } else
 835                 res = 0;
 836
 837 out:
 838         gss_release_msg(gss_msg);
 839
 840         RETURN(res);
 841 }
 842 #else /* !__KERNEL__ */
 843 extern int lgss_handle_krb5_upcall(uid_t uid, __u32 dest_ip,
 844                                    char *obd_name,
 845                                    char *buf, int bufsize,
 846                                    int (*callback)(char*, unsigned long));
 847
 848 static int gss_cred_refresh(struct ptlrpc_cred *cred)
 849 {
 850         char                    buf[4096];
 851         rawobj_t                obj;
 852         struct obd_import      *imp;
 853         struct gss_sec         *gsec;
 854         struct gss_api_mech    *mech;
 855         struct gss_cl_ctx      *ctx = NULL;
 856         struct vfs_cred         vcred = { 0 };
 857         ptl_nid_t               peer_nid;
 858         __u32                   dest_ip;
 859         __u32                   subflavor;
 860         int                     rc, gss_err;
 861
 862         LASSERT(cred);
 863         LASSERT(cred->pc_sec);
 864         LASSERT(cred->pc_sec->ps_import);
 865         LASSERT(cred->pc_sec->ps_import->imp_obd);
 866
 867         if (ptlrpcs_cred_is_uptodate(cred))
 868                 RETURN(0);
 869
 870         imp = cred->pc_sec->ps_import;
 871         peer_nid = imp->imp_connection->c_peer.peer_id.nid;
 872         dest_ip = (__u32) (peer_nid & 0xFFFFFFFF);
 873         subflavor = cred->pc_sec->ps_flavor.subflavor;
 874
 875         if (subflavor != PTLRPC_SEC_GSS_KRB5I) {
 876                 CERROR("unknown subflavor %u\n", subflavor);
 877                 GOTO(err_out, rc = -EINVAL);
 878         }
 879
 880         rc = lgss_handle_krb5_upcall(cred->pc_uid, dest_ip,
 881                                      imp->imp_obd->obd_name,
 882                                      buf, sizeof(buf),
 883                                      gss_send_secinit_rpc);
 884         LASSERT(rc != 0);
 885         if (rc < 0)
 886                 goto err_out;
 887
 888         obj.data = buf;
 889         obj.len = rc;
 890
 891         gsec = container_of(cred->pc_sec, struct gss_sec, gs_base);
 892         mech = gsec->gs_mech;
 893         LASSERT(mech);
 894         rc = gss_parse_init_downcall(mech, &obj, &ctx, &vcred, &dest_ip,
 895                                      &gss_err);
 896         if (rc || gss_err) {
 897                 CERROR("parse init downcall: rpc %d, gss 0x%x\n", rc, gss_err);
 898                 if (rc != -ERESTART || gss_err != 0)
 899                         cred->pc_flags |= PTLRPC_CRED_ERROR;
 900                 if (rc == 0)
 901                         rc = -EPERM;
 902                 goto err_out;
 903         }
 904
 905         LASSERT(ctx);
 906         gss_cred_set_ctx(cred, ctx);
 907         LASSERT(gss_cred_is_uptodate_ctx(cred));
 908
 909         return 0;
 910 err_out:
 911         cred->pc_flags |= PTLRPC_CRED_DEAD;
 912         return rc;
 913 }
 914 #endif
 915
 916 static int gss_cred_match(struct ptlrpc_cred *cred,
 917                           struct vfs_cred *vcred)
 918 {
 919         RETURN(cred->pc_pag == vcred->vc_pag);
 920 }
 921
 922 static int gss_cred_sign(struct ptlrpc_cred *cred,
 923                          struct ptlrpc_request *req)
 924 {
 925         struct gss_cred         *gcred;
 926         struct gss_cl_ctx       *ctx;
 927         rawobj_t                 lmsg, mic;
 928         __u32                   *vp, *vpsave, vlen, seclen;
 929         __u32                    seqnum, major, rc = 0;
 930         ENTRY;
 931
 932         LASSERT(req->rq_reqbuf);
 933         LASSERT(req->rq_cred == cred);
 934
 935         gcred = container_of(cred, struct gss_cred, gc_base);
 936         ctx = gss_cred_get_ctx(cred);
 937         if (!ctx) {
 938                 CERROR("cred %p("LPU64"/%u) invalidated?\n",
 939                         cred, cred->pc_pag, cred->pc_uid);
 940                 RETURN(-EPERM);
 941         }
 942
 943         lmsg.len = req->rq_reqlen;
 944         lmsg.data = (__u8 *) req->rq_reqmsg;
 945
 946         vp = (__u32 *) (lmsg.data + lmsg.len);
 947         vlen = req->rq_reqbuf_len - sizeof(struct ptlrpcs_wire_hdr) -
 948                lmsg.len;
 949         seclen = vlen;
 950
 951         if (vlen < 6 * 4 + size_round4(ctx->gc_wire_ctx.len)) {
 952                 CERROR("vlen %d, need %d\n",
 953                         vlen, 6 * 4 + size_round4(ctx->gc_wire_ctx.len));
 954                 rc = -EIO;
 955                 goto out;
 956         }
 957
 958         spin_lock(&ctx->gc_seq_lock);
 959         seqnum = ctx->gc_seq++;
 960         spin_unlock(&ctx->gc_seq_lock);
 961
 962         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);    /* version */
 963         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);      /* subflavor */
 964         *vp++ = cpu_to_le32(ctx->gc_proc);              /* proc */
 965         *vp++ = cpu_to_le32(seqnum);                    /* seq */
 966         *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_INTEGRITY);  /* service */
 967         vlen -= 5 * 4;
 968
 969         if (rawobj_serialize(&ctx->gc_wire_ctx, &vp, &vlen)) {
 970                 rc = -EIO;
 971                 goto out;
 972         }
 973         CDEBUG(D_SEC, "encoded wire_ctx length %d\n", ctx->gc_wire_ctx.len);
 974
 975         vpsave = vp++;  /* reserve for size */
 976         vlen -= 4;
 977
 978         mic.len = vlen;
 979         mic.data = (char *) vp;
 980
 981         CDEBUG(D_SEC, "reqbuf at %p, lmsg at %p, len %d, mic at %p, len %d\n",
 982                req->rq_reqbuf, lmsg.data, lmsg.len, mic.data, mic.len);
 983         major = kgss_get_mic(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT, &lmsg, &mic);
 984         if (major) {
 985                 CERROR("gss compute mic error, major %x\n", major);
 986                 rc = -EACCES;
 987                 goto out;
 988         }
 989
 990         *vpsave = cpu_to_le32(mic.len);
 991
 992         seclen = seclen - vlen + mic.len;
 993         buf_to_sec_hdr(req->rq_reqbuf)->sec_len = cpu_to_le32(seclen);
 994         req->rq_reqdata_len += size_round(seclen);
 995         CDEBUG(D_SEC, "msg size %d, checksum size %d, total sec size %d\n",
 996                lmsg.len, mic.len, seclen);
 997 out:
 998         gss_put_ctx(ctx);
 999         RETURN(rc);
1000 }
1001
1002 static int gss_cred_verify(struct ptlrpc_cred *cred,
1003                            struct ptlrpc_request *req)
1004 {
1005         struct gss_cred        *gcred;
1006         struct gss_cl_ctx      *ctx;
1007         struct ptlrpcs_wire_hdr *sec_hdr;
1008         rawobj_t                lmsg, mic;
1009         __u32                   *vp, vlen, subflavor, proc, seq, svc;
1010         __u32                   major, minor, rc;
1011         ENTRY;
1012
1013         LASSERT(req->rq_repbuf);
1014         LASSERT(req->rq_cred == cred);
1015
1016         sec_hdr = buf_to_sec_hdr(req->rq_repbuf);
1017         vp = (__u32 *) (req->rq_repbuf + sizeof(*sec_hdr) + sec_hdr->msg_len);
1018         vlen = sec_hdr->sec_len;
1019
1020         if (vlen < 7 * 4) {
1021                 CERROR("reply sec size %u too small\n", vlen);
1022                 RETURN(-EPROTO);
1023         }
1024
1025         if (*vp++ != cpu_to_le32(PTLRPC_SEC_GSS_VERSION)) {
1026                 CERROR("reply have different gss version\n");
1027                 RETURN(-EPROTO);
1028         }
1029         subflavor = le32_to_cpu(*vp++);
1030         proc = le32_to_cpu(*vp++);
1031         vlen -= 3 * 4;
1032
1033         switch (proc) {
1034         case PTLRPC_GSS_PROC_DATA:
1035                 seq = le32_to_cpu(*vp++);
1036                 svc = le32_to_cpu(*vp++);
1037                 if (svc != PTLRPC_GSS_SVC_INTEGRITY) {
1038                         CERROR("Unknown svc %d\n", svc);
1039                         RETURN(-EPROTO);
1040                 }
1041                 if (*vp++ != 0) {
1042                         CERROR("Unexpected ctx handle\n");
1043                         RETURN(-EPROTO);
1044                 }
1045                 mic.len = le32_to_cpu(*vp++);
1046                 vlen -= 4 * 4;
1047                 if (vlen < mic.len) {
1048                         CERROR("vlen %d, mic.len %d\n", vlen, mic.len);
1049                         RETURN(-EINVAL);
1050                 }
1051                 mic.data = (char *) vp;
1052
1053                 gcred = container_of(cred, struct gss_cred, gc_base);
1054                 ctx = gss_cred_get_ctx(cred);
1055                 LASSERT(ctx);
1056
1057                 lmsg.len = sec_hdr->msg_len;
1058                 lmsg.data = (__u8 *) buf_to_lustre_msg(req->rq_repbuf);
1059
1060                 major = kgss_verify_mic(ctx->gc_gss_ctx, &lmsg, &mic, NULL);
1061                 if (major != GSS_S_COMPLETE) {
1062                         CERROR("gss verify mic error: major %x\n", major);
1063                         GOTO(proc_data_out, rc = -EINVAL);
1064                 }
1065
1066                 req->rq_repmsg = (struct lustre_msg *) lmsg.data;
1067                 req->rq_replen = lmsg.len;
1068
1069                 /* here we could check the seq number is the same one
1070                  * we sent to server. but portals has prevent us from
1071                  * replay attack, so maybe we don't need check it again.
1072                  */
1073                 rc = 0;
1074 proc_data_out:
1075                 gss_put_ctx(ctx);
1076                 break;
1077         case PTLRPC_GSS_PROC_ERR:
1078                 major = le32_to_cpu(*vp++);
1079                 minor = le32_to_cpu(*vp++);
1080                 /* server return NO_CONTEXT might be caused by context expire
1081                  * or server reboot/failover. we refresh the cred transparently
1082                  * to upper layer.
1083                  * In some cases, our gss handle is possible to be incidentally
1084                  * identical to another handle since the handle itself is not
1085                  * fully random. In krb5 case, the GSS_S_BAD_SIG will be
1086                  * returned, maybe other gss error for other mechanism. Here we
1087                  * only consider krb5 mech (FIXME) and try to establish new
1088                  * context.
1089                  */
1090                 if (major == GSS_S_NO_CONTEXT ||
1091                     major == GSS_S_BAD_SIG) {
1092                         CWARN("req %p: server report cred %p %s, expired?\n",
1093                                req, cred, (major == GSS_S_NO_CONTEXT) ?
1094                                            "NO_CONTEXT" : "BAD_SIG");
1095
1096                         ptlrpcs_cred_die(cred);
1097                         rc = ptlrpcs_req_replace_dead_cred(req);
1098                         if (!rc)
1099                                 req->rq_ptlrpcs_restart = 1;
1100                         else
1101                                 CERROR("replace dead cred failed %d\n", rc);
1102                 } else {
1103                         CERROR("Unrecognized gss error (%x/%x)\n",
1104                                 major, minor);
1105                         rc = -EACCES;
1106                 }
1107                 break;
1108         default:
1109                 CERROR("unknown gss proc %d\n", proc);
1110                 rc = -EPROTO;
1111         }
1112
1113         RETURN(rc);
1114 }
1115
1116 static int gss_cred_seal(struct ptlrpc_cred *cred,
1117                          struct ptlrpc_request *req)
1118 {
1119         struct gss_cred         *gcred;
1120         struct gss_cl_ctx       *ctx;
1121         struct ptlrpcs_wire_hdr *sec_hdr;
1122         rawobj_buf_t             msg_buf;
1123         rawobj_t                 cipher_buf;
1124         __u32                   *vp, *vpsave, vlen, seclen;
1125         __u32                    major, seqnum, rc = 0;
1126         ENTRY;
1127
1128         LASSERT(req->rq_reqbuf);
1129         LASSERT(req->rq_cred == cred);
1130
1131         gcred = container_of(cred, struct gss_cred, gc_base);
1132         ctx = gss_cred_get_ctx(cred);
1133         if (!ctx) {
1134                 CERROR("cred %p("LPU64"/%u) invalidated?\n",
1135                         cred, cred->pc_pag, cred->pc_uid);
1136                 RETURN(-EPERM);
1137         }
1138
1139         vp = (__u32 *) (req->rq_reqbuf + sizeof(*sec_hdr));
1140         vlen = req->rq_reqbuf_len - sizeof(*sec_hdr);
1141         seclen = vlen;
1142
1143         if (vlen < 6 * 4 + size_round4(ctx->gc_wire_ctx.len)) {
1144                 CERROR("vlen %d, need %d\n",
1145                         vlen, 6 * 4 + size_round4(ctx->gc_wire_ctx.len));
1146                 rc = -EIO;
1147                 goto out;
1148         }
1149
1150         spin_lock(&ctx->gc_seq_lock);
1151         seqnum = ctx->gc_seq++;
1152         spin_unlock(&ctx->gc_seq_lock);
1153
1154         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);    /* version */
1155         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5P);      /* subflavor */
1156         *vp++ = cpu_to_le32(ctx->gc_proc);              /* proc */
1157         *vp++ = cpu_to_le32(seqnum);                    /* seq */
1158         *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_PRIVACY);    /* service */
1159         vlen -= 5 * 4;
1160
1161         if (rawobj_serialize(&ctx->gc_wire_ctx, &vp, &vlen)) {
1162                 rc = -EIO;
1163                 goto out;
1164         }
1165         CDEBUG(D_SEC, "encoded wire_ctx length %d\n", ctx->gc_wire_ctx.len);
1166
1167         vpsave = vp++;  /* reserve for size */
1168         vlen -= 4;
1169
1170         msg_buf.buf = (__u8 *) req->rq_reqmsg - GSS_PRIVBUF_PREFIX_LEN;
1171         msg_buf.buflen = req->rq_reqlen + GSS_PRIVBUF_PREFIX_LEN + GSS_PRIVBUF_SUFFIX_LEN;
1172         msg_buf.dataoff = GSS_PRIVBUF_PREFIX_LEN;
1173         msg_buf.datalen = req->rq_reqlen;
1174
1175         cipher_buf.data = (__u8 *) vp;
1176         cipher_buf.len = vlen;
1177
1178         major = kgss_wrap(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT,
1179                           &msg_buf, &cipher_buf);
1180         if (major) {
1181                 CERROR("error wrap: major 0x%x\n", major);
1182                 GOTO(out, rc = -EINVAL);
1183         }
1184
1185         *vpsave = cpu_to_le32(cipher_buf.len);
1186
1187         seclen = seclen - vlen + cipher_buf.len;
1188         sec_hdr = buf_to_sec_hdr(req->rq_reqbuf);
1189         sec_hdr->sec_len = cpu_to_le32(seclen);
1190         req->rq_reqdata_len += size_round(seclen);
1191
1192         CDEBUG(D_SEC, "msg size %d, total sec size %d\n",
1193                req->rq_reqlen, seclen);
1194 out:
1195         gss_put_ctx(ctx);
1196         RETURN(rc);
1197 }
1198
1199 static int gss_cred_unseal(struct ptlrpc_cred *cred,
1200                            struct ptlrpc_request *req)
1201 {
1202         struct gss_cred        *gcred;
1203         struct gss_cl_ctx      *ctx;
1204         struct ptlrpcs_wire_hdr *sec_hdr;
1205         rawobj_t                cipher_text, plain_text;
1206         __u32                   *vp, vlen, subflavor, proc, seq, svc;
1207         int                     rc;
1208         ENTRY;
1209
1210         LASSERT(req->rq_repbuf);
1211         LASSERT(req->rq_cred == cred);
1212
1213         sec_hdr = buf_to_sec_hdr(req->rq_repbuf);
1214         if (sec_hdr->msg_len != 0) {
1215                 CERROR("unexpected msg_len %u\n", sec_hdr->msg_len);
1216                 RETURN(-EPROTO);
1217         }
1218
1219         vp = (__u32 *) (req->rq_repbuf + sizeof(*sec_hdr));
1220         vlen = sec_hdr->sec_len;
1221
1222         if (vlen < 7 * 4) {
1223                 CERROR("reply sec size %u too small\n", vlen);
1224                 RETURN(-EPROTO);
1225         }
1226
1227         if (*vp++ != cpu_to_le32(PTLRPC_SEC_GSS_VERSION)) {
1228                 CERROR("reply have different gss version\n");
1229                 RETURN(-EPROTO);
1230         }
1231         subflavor = le32_to_cpu(*vp++);
1232         proc = le32_to_cpu(*vp++);
1233         seq = le32_to_cpu(*vp++);
1234         svc = le32_to_cpu(*vp++);
1235         vlen -= 5 * 4;
1236
1237         switch (proc) {
1238         case PTLRPC_GSS_PROC_DATA:
1239                 if (svc != PTLRPC_GSS_SVC_PRIVACY) {
1240                         CERROR("Unknown svc %d\n", svc);
1241                         RETURN(-EPROTO);
1242                 }
1243                 if (*vp++ != 0) {
1244                         CERROR("Unexpected ctx handle\n");
1245                         RETURN(-EPROTO);
1246                 }
1247                 vlen -= 4;
1248
1249                 cipher_text.len = le32_to_cpu(*vp++);
1250                 cipher_text.data = (__u8 *) vp;
1251                 vlen -= 4;
1252
1253                 if (vlen < cipher_text.len) {
1254                         CERROR("cipher text to be %u while buf only %u\n",
1255                                 cipher_text.len, vlen);
1256                         RETURN(-EPROTO);
1257                 }
1258
1259                 plain_text = cipher_text;
1260
1261                 gcred = container_of(cred, struct gss_cred, gc_base);
1262                 ctx = gss_cred_get_ctx(cred);
1263                 LASSERT(ctx);
1264
1265                 rc = kgss_unwrap(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT,
1266                                  &cipher_text, &plain_text);
1267                 if (rc) {
1268                         CERROR("error unwrap: 0x%x\n", rc);
1269                         GOTO(proc_out, rc = -EINVAL);
1270                 }
1271
1272                 req->rq_repmsg = (struct lustre_msg *) vp;
1273                 req->rq_replen = plain_text.len;
1274
1275                 rc = 0;
1276 proc_out:
1277                 gss_put_ctx(ctx);
1278                 break;
1279         default:
1280                 CERROR("unknown gss proc %d\n", proc);
1281                 rc = -EPROTO;
1282         }
1283
1284         RETURN(rc);
1285 }
1286
1287 static void destroy_gss_context(struct ptlrpc_cred *cred)
1288 {
1289         struct ptlrpcs_wire_hdr *hdr;
1290         struct lustre_msg       *lmsg;
1291         struct gss_cred         *gcred;
1292         struct ptlrpc_request    req;
1293         struct obd_import       *imp;
1294         __u32                   *vp, lmsg_size;
1295         ENTRY;
1296
1297         /* cred's refcount is 0, steal one */
1298         atomic_inc(&cred->pc_refcount);
1299
1300         gcred = container_of(cred, struct gss_cred, gc_base);
1301         gcred->gc_ctx->gc_proc = PTLRPC_GSS_PROC_DESTROY;
1302         imp = cred->pc_sec->ps_import;
1303         LASSERT(imp);
1304
1305         if (!(cred->pc_flags & PTLRPC_CRED_UPTODATE)) {
1306                 CWARN("Destroy a dead gss cred %p(%u@%s), don't send rpc\n",
1307                        gcred, cred->pc_uid, imp->imp_target_uuid.uuid);
1308                 atomic_dec(&cred->pc_refcount);
1309                 EXIT;
1310                 return;
1311         }
1312
1313         CWARN("client destroy gss cred %p(%u@%s)\n",
1314                gcred, cred->pc_uid, imp->imp_target_uuid.uuid);
1315
1316         lmsg_size = lustre_msg_size(0, NULL);
1317         req.rq_reqbuf_len = sizeof(*hdr) + lmsg_size +
1318                             ptlrpcs_est_req_payload(cred->pc_sec, lmsg_size);
1319
1320         OBD_ALLOC(req.rq_reqbuf, req.rq_reqbuf_len);
1321         if (!req.rq_reqbuf) {
1322                 CERROR("Fail to alloc reqbuf, cancel anyway\n");
1323                 atomic_dec(&cred->pc_refcount);
1324                 EXIT;
1325                 return;
1326         }
1327
1328         /* wire hdr */
1329         hdr = buf_to_sec_hdr(req.rq_reqbuf);
1330         hdr->flavor  = cpu_to_le32(PTLRPC_SEC_GSS);
1331         hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_AUTH);
1332         hdr->msg_len = cpu_to_le32(lmsg_size);
1333         hdr->sec_len = cpu_to_le32(0);
1334
1335         /* lustre message */
1336         lmsg = buf_to_lustre_msg(req.rq_reqbuf);
1337         lustre_init_msg(lmsg, 0, NULL, NULL);
1338         lmsg->handle   = imp->imp_remote_handle;
1339         lmsg->type     = PTL_RPC_MSG_REQUEST;
1340         lmsg->opc      = SEC_FINI;
1341         lmsg->flags    = 0;
1342         lmsg->conn_cnt = imp->imp_conn_cnt;
1343         /* add this for randomize */
1344         get_random_bytes(&lmsg->last_xid, sizeof(lmsg->last_xid));
1345         get_random_bytes(&lmsg->transno, sizeof(lmsg->transno));
1346
1347         vp = (__u32 *) req.rq_reqbuf;
1348
1349         req.rq_cred = cred;
1350         req.rq_reqmsg = buf_to_lustre_msg(req.rq_reqbuf);
1351         req.rq_reqlen = lmsg_size;
1352         req.rq_reqdata_len = sizeof(*hdr) + lmsg_size;
1353
1354         if (gss_cred_sign(cred, &req)) {
1355                 CERROR("failed to sign, cancel anyway\n");
1356                 atomic_dec(&cred->pc_refcount);
1357                 goto exit;
1358         }
1359         atomic_dec(&cred->pc_refcount);
1360
1361         /* send out */
1362         gss_send_secfini_rpc(imp, req.rq_reqbuf, req.rq_reqdata_len);
1363 exit:
1364         OBD_FREE(req.rq_reqbuf, req.rq_reqbuf_len);
1365         EXIT;
1366 }
1367
1368 static void gss_cred_destroy(struct ptlrpc_cred *cred)
1369 {
1370         struct gss_cred *gcred;
1371         ENTRY;
1372
1373         LASSERT(cred);
1374         LASSERT(!atomic_read(&cred->pc_refcount));
1375
1376         gcred = container_of(cred, struct gss_cred, gc_base);
1377         if (gcred->gc_ctx) {
1378                 destroy_gss_context(cred);
1379                 gss_put_ctx(gcred->gc_ctx);
1380         }
1381
1382         CDEBUG(D_SEC, "GSS_SEC: destroy cred %p\n", gcred);
1383
1384         OBD_FREE(gcred, sizeof(*gcred));
1385         EXIT;
1386 }
1387
1388 static struct ptlrpc_credops gss_credops = {
1389         .refresh        = gss_cred_refresh,
1390         .match          = gss_cred_match,
1391         .sign           = gss_cred_sign,
1392         .verify         = gss_cred_verify,
1393         .seal           = gss_cred_seal,
1394         .unseal         = gss_cred_unseal,
1395         .destroy        = gss_cred_destroy,
1396 };
1397
1398 #ifdef __KERNEL__
1399 /*******************************************
1400  * rpc_pipe APIs                           *
1401  *******************************************/
1402 static ssize_t
1403 gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
1404                 char *dst, size_t buflen)
1405 {
1406         char *data = (char *)msg->data + msg->copied;
1407         ssize_t mlen = msg->len;
1408         ssize_t left;
1409         ENTRY;
1410
1411         if (mlen > buflen)
1412                 mlen = buflen;
1413         left = copy_to_user(dst, data, mlen);
1414         if (left < 0) {
1415                 msg->errno = left;
1416                 RETURN(left);
1417         }
1418         mlen -= left;
1419         msg->copied += mlen;
1420         msg->errno = 0;
1421         RETURN(mlen);
1422 }
1423
1424 static ssize_t
1425 gss_pipe_downcall(struct file *filp, const char *src, size_t mlen)
1426 {
1427         char *buf;
1428         const int bufsize = 1024;
1429         rawobj_t obj;
1430         struct inode *inode = filp->f_dentry->d_inode;
1431         struct rpc_inode *rpci = RPC_I(inode);
1432         struct obd_import *import;
1433         struct ptlrpc_sec *sec;
1434         struct gss_sec *gsec;
1435         char *obdname;
1436         struct gss_api_mech *mech;
1437         struct vfs_cred vcred = { 0 };
1438         struct ptlrpc_cred *cred;
1439         struct gss_upcall_msg *gss_msg;
1440         struct gss_upcall_msg_data gmd = { 0 };
1441         struct gss_cl_ctx *ctx = NULL;
1442         ssize_t left;
1443         int err, gss_err;
1444         ENTRY;
1445
1446         if (mlen > bufsize) {
1447                 CERROR("mlen %ld > bufsize %d\n", (long)mlen, bufsize);
1448                 RETURN(-ENOSPC);
1449         }
1450
1451         OBD_ALLOC(buf, bufsize);
1452         if (!buf) {
1453                 CERROR("alloc mem failed\n");
1454                 RETURN(-ENOMEM);
1455         }
1456
1457         left = copy_from_user(buf, src, mlen);
1458         if (left)
1459                 GOTO(err_free, err = -EFAULT);
1460
1461         obj.data = buf;
1462         obj.len = mlen;
1463
1464         LASSERT(rpci->private);
1465         gsec = (struct gss_sec *)rpci->private;
1466         sec = &gsec->gs_base;
1467         LASSERT(sec->ps_import);
1468         import = class_import_get(sec->ps_import);
1469         LASSERT(import->imp_obd);
1470         obdname = import->imp_obd->obd_name;
1471         mech = gsec->gs_mech;
1472
1473         err = gss_parse_init_downcall(mech, &obj, &ctx, &gmd, &gss_err);
1474         if (err)
1475                 CERROR("parse init downcall err %d\n", err);
1476
1477         vcred.vc_uid = gmd.gum_uid;
1478         vcred.vc_pag = vcred.vc_uid; /* FIXME */
1479
1480         cred = ptlrpcs_cred_lookup(sec, &vcred);
1481         if (!cred) {
1482                 CWARN("didn't find cred for uid %u\n", vcred.vc_uid);
1483                 GOTO(err, err = -EINVAL);
1484         }
1485
1486         if (err || gss_err) {
1487                 cred->pc_flags |= PTLRPC_CRED_DEAD;
1488                 if (err != -ERESTART || gss_err != 0)
1489                         cred->pc_flags |= PTLRPC_CRED_ERROR;
1490                 CERROR("cred %p: rpc err %d, gss err 0x%x, fatal %d\n",
1491                         cred, err, gss_err,
1492                         ((cred->pc_flags & PTLRPC_CRED_ERROR) != 0));
1493         } else {
1494                 CDEBUG(D_SEC, "get initial ctx:\n");
1495                 gss_cred_set_ctx(cred, ctx);
1496         }
1497
1498         spin_lock(&gsec->gs_lock);
1499         gss_msg = gss_find_upcall(gsec, obdname, &gmd);
1500         if (gss_msg) {
1501                 gss_unhash_msg_nolock(gss_msg);
1502                 spin_unlock(&gsec->gs_lock);
1503                 gss_release_msg(gss_msg);
1504         } else
1505                 spin_unlock(&gsec->gs_lock);
1506
1507         ptlrpcs_cred_put(cred, 1);
1508         class_import_put(import);
1509         OBD_FREE(buf, bufsize);
1510         RETURN(mlen);
1511 err:
1512         if (ctx)
1513                 gss_destroy_ctx(ctx);
1514         class_import_put(import);
1515 err_free:
1516         OBD_FREE(buf, bufsize);
1517         CDEBUG(D_SEC, "gss_pipe_downcall returning %d\n", err);
1518         RETURN(err);
1519 }
1520
1521 static
1522 void gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
1523 {
1524         struct gss_upcall_msg *gmsg;
1525         static unsigned long ratelimit;
1526         ENTRY;
1527
1528         if (msg->errno >= 0) {
1529                 EXIT;
1530                 return;
1531         }
1532
1533         gmsg = container_of(msg, struct gss_upcall_msg, gum_base);
1534         CDEBUG(D_SEC, "destroy gmsg %p\n", gmsg);
1535         atomic_inc(&gmsg->gum_refcount);
1536         gss_unhash_msg(gmsg);
1537         if (msg->errno == -ETIMEDOUT || msg->errno == -EPIPE) {
1538                 unsigned long now = get_seconds();
1539                 if (time_after(now, ratelimit)) {
1540                         CWARN("GSS_SEC upcall timed out.\n"
1541                               "Please check user daemon is running!\n");
1542                         ratelimit = now + 15;
1543                 }
1544         }
1545         gss_release_msg(gmsg);
1546         EXIT;
1547 }
1548
1549 static
1550 void gss_pipe_release(struct inode *inode)
1551 {
1552         struct rpc_inode *rpci = RPC_I(inode);
1553         struct ptlrpc_sec *sec;
1554         struct gss_sec *gsec;
1555         ENTRY;
1556
1557         gsec = (struct gss_sec *)rpci->private;
1558         sec = &gsec->gs_base;
1559         spin_lock(&gsec->gs_lock);
1560         while (!list_empty(&gsec->gs_upcalls)) {
1561                 struct gss_upcall_msg *gmsg;
1562
1563                 gmsg = list_entry(gsec->gs_upcalls.next,
1564                                   struct gss_upcall_msg, gum_list);
1565                 gmsg->gum_base.errno = -EPIPE;
1566                 atomic_inc(&gmsg->gum_refcount);
1567                 gss_unhash_msg_nolock(gmsg);
1568                 gss_release_msg(gmsg);
1569         }
1570         spin_unlock(&gsec->gs_lock);
1571         EXIT;
1572 }
1573
1574 static struct rpc_pipe_ops gss_upcall_ops = {
1575         .upcall         = gss_pipe_upcall,
1576         .downcall       = gss_pipe_downcall,
1577         .destroy_msg    = gss_pipe_destroy_msg,
1578         .release_pipe   = gss_pipe_release,
1579 };
1580 #endif /* __KERNEL__ */
1581
1582 /*********************************************
1583  * GSS security APIs                         *
1584  *********************************************/
1585
1586 static
1587 struct ptlrpc_sec* gss_create_sec(ptlrpcs_flavor_t *flavor,
1588                                   const char *pipe_dir,
1589                                   void *pipe_data)
1590 {
1591         struct gss_sec *gsec;
1592         struct ptlrpc_sec *sec;
1593 #ifdef __KERNEL__
1594         char *pos;
1595         int   pipepath_len;
1596 #endif
1597         ENTRY;
1598
1599         LASSERT(flavor->flavor == PTLRPC_SEC_GSS);
1600
1601         OBD_ALLOC(gsec, sizeof(*gsec));
1602         if (!gsec) {
1603                 CERROR("can't alloc gsec\n");
1604                 RETURN(NULL);
1605         }
1606
1607         gsec->gs_mech = kgss_subflavor_to_mech(flavor->subflavor);
1608         if (!gsec->gs_mech) {
1609                 CERROR("subflavor %d not found\n", flavor->subflavor);
1610                 goto err_free;
1611         }
1612
1613         /* initialize gss sec */
1614 #ifdef __KERNEL__
1615         INIT_LIST_HEAD(&gsec->gs_upcalls);
1616         spin_lock_init(&gsec->gs_lock);
1617
1618         pipepath_len = strlen(LUSTRE_PIPEDIR) + strlen(pipe_dir) +
1619                        strlen(gsec->gs_mech->gm_name) + 3;
1620         OBD_ALLOC(gsec->gs_pipepath, pipepath_len);
1621         if (!gsec->gs_pipepath)
1622                 goto err_mech_put;
1623
1624         sprintf(gsec->gs_pipepath, LUSTRE_PIPEDIR"/%s", pipe_dir);
1625         if (IS_ERR(rpc_mkdir(gsec->gs_pipepath, NULL))) {
1626                 CERROR("can't make pipedir %s\n", gsec->gs_pipepath);
1627                 goto err_free_path;
1628         }
1629
1630         sprintf(gsec->gs_pipepath, LUSTRE_PIPEDIR"/%s/%s", pipe_dir,
1631                 gsec->gs_mech->gm_name);
1632         gsec->gs_depipe = rpc_mkpipe(gsec->gs_pipepath, gsec,
1633                                      &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
1634         if (IS_ERR(gsec->gs_depipe)) {
1635                 CERROR("failed to make rpc_pipe %s: %ld\n",
1636                         gsec->gs_pipepath, PTR_ERR(gsec->gs_depipe));
1637                 goto err_rmdir;
1638         }
1639         CDEBUG(D_SEC, "gss sec %p, pipe path %s\n", gsec, gsec->gs_pipepath);
1640 #endif
1641
1642         sec = &gsec->gs_base;
1643
1644         switch (flavor->subflavor) {
1645         case PTLRPC_SEC_GSS_KRB5I:
1646                 sec->ps_sectype = PTLRPC_SEC_TYPE_AUTH;
1647                 break;
1648         case PTLRPC_SEC_GSS_KRB5P:
1649                 sec->ps_sectype = PTLRPC_SEC_TYPE_PRIV;
1650                 break;
1651         default:
1652                 LBUG();
1653         }
1654
1655         sec->ps_expire = GSS_CREDCACHE_EXPIRE;
1656         sec->ps_nextgc = get_seconds() + sec->ps_expire;
1657         sec->ps_flags = 0;
1658
1659         CDEBUG(D_SEC, "Create GSS security instance at %p(external %p)\n",
1660                gsec, sec);
1661         RETURN(sec);
1662
1663 #ifdef __KERNEL__
1664 err_rmdir:
1665         pos = strrchr(gsec->gs_pipepath, '/');
1666         LASSERT(pos);
1667         *pos = 0;
1668         rpc_rmdir(gsec->gs_pipepath);
1669 err_free_path:
1670         OBD_FREE(gsec->gs_pipepath, pipepath_len);
1671 err_mech_put:
1672 #endif
1673         kgss_mech_put(gsec->gs_mech);
1674 err_free:
1675         OBD_FREE(gsec, sizeof(*gsec));
1676         RETURN(NULL);
1677 }
1678
1679 static
1680 void gss_destroy_sec(struct ptlrpc_sec *sec)
1681 {
1682         struct gss_sec *gsec;
1683 #ifdef __KERNEL__
1684         char *pos;
1685         int   pipepath_len;
1686 #endif
1687         ENTRY;
1688
1689         gsec = container_of(sec, struct gss_sec, gs_base);
1690         CDEBUG(D_SEC, "Destroy GSS security instance at %p\n", gsec);
1691
1692         LASSERT(gsec->gs_mech);
1693         LASSERT(!atomic_read(&sec->ps_refcount));
1694         LASSERT(!atomic_read(&sec->ps_credcount));
1695 #ifdef __KERNEL__
1696         pipepath_len = strlen(gsec->gs_pipepath) + 1;
1697         rpc_unlink(gsec->gs_pipepath);
1698         pos = strrchr(gsec->gs_pipepath, '/');
1699         LASSERT(pos);
1700         *pos = 0;
1701         rpc_rmdir(gsec->gs_pipepath);
1702         OBD_FREE(gsec->gs_pipepath, pipepath_len);
1703 #endif
1704
1705         kgss_mech_put(gsec->gs_mech);
1706         OBD_FREE(gsec, sizeof(*gsec));
1707         EXIT;
1708 }
1709
1710 static
1711 struct ptlrpc_cred * gss_create_cred(struct ptlrpc_sec *sec,
1712                                      struct vfs_cred *vcred)
1713 {
1714         struct gss_cred *gcred;
1715         struct ptlrpc_cred *cred;
1716         ENTRY;
1717
1718         OBD_ALLOC(gcred, sizeof(*gcred));
1719         if (!gcred)
1720                 RETURN(NULL);
1721
1722         cred = &gcred->gc_base;
1723         INIT_LIST_HEAD(&cred->pc_hash);
1724         atomic_set(&cred->pc_refcount, 0);
1725         cred->pc_sec = sec;
1726         cred->pc_ops = &gss_credops;
1727         cred->pc_expire = get_seconds() + GSS_CRED_EXPIRE;
1728         cred->pc_flags = 0;
1729         cred->pc_pag = vcred->vc_pag;
1730         cred->pc_uid = vcred->vc_uid;
1731         CDEBUG(D_SEC, "create a gss cred at %p("LPU64"/%u)\n",
1732                cred, vcred->vc_pag, vcred->vc_uid);
1733
1734         RETURN(cred);
1735 }
1736
1737 static int gss_estimate_payload(struct ptlrpc_sec *sec, int msgsize)
1738 {
1739         switch (sec->ps_sectype) {
1740         case PTLRPC_SEC_TYPE_AUTH:
1741                 return GSS_MAX_AUTH_PAYLOAD;
1742         case PTLRPC_SEC_TYPE_PRIV:
1743                 return size_round16(GSS_MAX_AUTH_PAYLOAD + msgsize +
1744                                     GSS_PRIVBUF_PREFIX_LEN +
1745                                     GSS_PRIVBUF_SUFFIX_LEN);
1746         default:
1747                 LBUG();
1748                 return 0;
1749         }
1750 }
1751
1752 static int gss_alloc_reqbuf(struct ptlrpc_sec *sec,
1753                             struct ptlrpc_request *req,
1754                             int lmsg_size)
1755 {
1756         int msg_payload, sec_payload;
1757         int privacy, rc;
1758         ENTRY;
1759
1760         /* In PRIVACY mode, lustre message is always 0 (already encoded into
1761          * security payload).
1762          */
1763         privacy = sec->ps_sectype == PTLRPC_SEC_TYPE_PRIV;
1764         msg_payload = privacy ? 0 : lmsg_size;
1765         sec_payload = gss_estimate_payload(sec, lmsg_size);
1766
1767         rc = sec_alloc_reqbuf(sec, req, msg_payload, sec_payload);
1768         if (rc)
1769                 return rc;
1770
1771         if (privacy) {
1772                 int buflen = lmsg_size + GSS_PRIVBUF_PREFIX_LEN +
1773                              GSS_PRIVBUF_SUFFIX_LEN;
1774                 char *buf;
1775
1776                 OBD_ALLOC(buf, buflen);
1777                 if (!buf) {
1778                         CERROR("Fail to alloc %d\n", buflen);
1779                         sec_free_reqbuf(sec, req);
1780                         RETURN(-ENOMEM);
1781                 }
1782                 req->rq_reqmsg = (struct lustre_msg *)
1783                                         (buf + GSS_PRIVBUF_PREFIX_LEN);
1784         }
1785
1786         RETURN(0);
1787 }
1788
1789 static void gss_free_reqbuf(struct ptlrpc_sec *sec,
1790                             struct ptlrpc_request *req)
1791 {
1792         char *buf;
1793         int privacy;
1794         ENTRY;
1795
1796         LASSERT(req->rq_reqmsg);
1797         LASSERT(req->rq_reqlen);
1798
1799         privacy = sec->ps_sectype == PTLRPC_SEC_TYPE_PRIV;
1800         if (privacy) {
1801                 buf = (char *) req->rq_reqmsg - GSS_PRIVBUF_PREFIX_LEN;
1802                 LASSERT(buf < req->rq_reqbuf ||
1803                         buf >= req->rq_reqbuf + req->rq_reqbuf_len);
1804                 OBD_FREE(buf, req->rq_reqlen + GSS_PRIVBUF_PREFIX_LEN +
1805                               GSS_PRIVBUF_SUFFIX_LEN);
1806                 req->rq_reqmsg = NULL;
1807         }
1808
1809         sec_free_reqbuf(sec, req);
1810 }
1811
1812 static struct ptlrpc_secops gss_secops = {
1813         .create_sec             = gss_create_sec,
1814         .destroy_sec            = gss_destroy_sec,
1815         .create_cred            = gss_create_cred,
1816         .est_req_payload        = gss_estimate_payload,
1817         .est_rep_payload        = gss_estimate_payload,
1818         .alloc_reqbuf           = gss_alloc_reqbuf,
1819         .free_reqbuf            = gss_free_reqbuf,
1820 };
1821
1822 static struct ptlrpc_sec_type gss_type = {
1823         .pst_owner      = THIS_MODULE,
1824         .pst_name       = "GSS_SEC",
1825         .pst_inst       = ATOMIC_INIT(0),
1826         .pst_flavor     = {PTLRPC_SEC_GSS, 0},
1827         .pst_ops        = &gss_secops,
1828 };
1829
1830 extern int
1831 (*lustre_secinit_downcall_handler)(char *buffer, unsigned long count);
1832
1833 int __init ptlrpcs_gss_init(void)
1834 {
1835         int rc;
1836
1837         rc = ptlrpcs_register(&gss_type);
1838         if (rc)
1839                 return rc;
1840
1841 #ifdef __KERNEL__
1842         gss_svc_init();
1843
1844         rc = PTR_ERR(rpc_mkdir(LUSTRE_PIPEDIR, NULL));
1845         if (IS_ERR((void *)rc) && rc != -EEXIST) {
1846                 CERROR("fail to make rpcpipedir for lustre\n");
1847                 gss_svc_exit();
1848                 ptlrpcs_unregister(&gss_type);
1849                 return -1;
1850         }
1851         rc = 0;
1852 #else
1853 #endif
1854         rc = init_kerberos_module();
1855         if (rc) {
1856                 ptlrpcs_unregister(&gss_type);
1857         }
1858
1859         lustre_secinit_downcall_handler = gss_send_secinit_rpc;
1860
1861         return rc;
1862 }
1863
1864 #ifdef __KERNEL__
1865 static void __exit ptlrpcs_gss_exit(void)
1866 {
1867         lustre_secinit_downcall_handler = NULL;
1868
1869         cleanup_kerberos_module();
1870         rpc_rmdir(LUSTRE_PIPEDIR);
1871         gss_svc_exit();
1872         ptlrpcs_unregister(&gss_type);
1873 }
1874 #endif
1875
1876 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1877 MODULE_DESCRIPTION("GSS Security module for Lustre");
1878 MODULE_LICENSE("GPL");
1879
1880 module_init(ptlrpcs_gss_init);
1881 module_exit(ptlrpcs_gss_exit);