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     (30)
  91 #define SECFINI_RPC_TIMEOUT     (30)
  92
  93 static int secinit_compose_request(struct obd_import *imp,
  94                                    char *buf, int bufsize,
  95                                    int lustre_srv,
  96                                    uid_t uid, gid_t gid,
  97                                    long token_size,
  98                                    char __user *token)
  99 {
 100         struct ptlrpcs_wire_hdr *hdr;
 101         struct lustre_msg       *lmsg;
 102         struct mds_req_sec_desc *secdesc;
 103         int                      size = sizeof(*secdesc);
 104         __u32                    lmsg_size, *p;
 105         int                      rc;
 106
 107         lmsg_size = lustre_msg_size(1, &size);
 108
 109         if (sizeof(*hdr) + lmsg_size + size_round(token_size) > bufsize) {
 110                 CERROR("token size %ld too large\n", token_size);
 111                 return -EINVAL;
 112         }
 113
 114         /* security wire hdr */
 115         hdr = buf_to_sec_hdr(buf);
 116         hdr->flavor  = cpu_to_le32(PTLRPC_SEC_GSS);
 117         hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_NONE);
 118         hdr->msg_len = cpu_to_le32(lmsg_size);
 119         hdr->sec_len = cpu_to_le32(8 * 4 + token_size);
 120
 121         /* lustre message & secdesc */
 122         lmsg = buf_to_lustre_msg(buf);
 123
 124         lustre_init_msg(lmsg, 1, &size, NULL);
 125         secdesc = lustre_msg_buf(lmsg, 0, size);
 126         secdesc->rsd_uid = secdesc->rsd_fsuid = uid;
 127         secdesc->rsd_gid = secdesc->rsd_fsgid = gid;
 128         secdesc->rsd_cap = secdesc->rsd_ngroups = 0;
 129
 130         lmsg->handle   = imp->imp_remote_handle;
 131         lmsg->type     = PTL_RPC_MSG_REQUEST;
 132         lmsg->opc      = SEC_INIT;
 133         lmsg->flags    = 0;
 134         lmsg->conn_cnt = imp->imp_conn_cnt;
 135
 136         p = (__u32 *) (buf + sizeof(*hdr) + lmsg_size);
 137
 138         /* gss hdr */
 139         *p++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);     /* gss version */
 140         *p++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);       /* subflavor */
 141         *p++ = cpu_to_le32(PTLRPC_GSS_PROC_INIT);       /* proc */
 142         *p++ = cpu_to_le32(0);                          /* seq */
 143         *p++ = cpu_to_le32(PTLRPC_GSS_SVC_NONE);        /* service */
 144         *p++ = cpu_to_le32(0);                          /* context handle */
 145
 146         /* plus lustre svc type */
 147         *p++ = cpu_to_le32(lustre_srv);
 148
 149         /* now the token part */
 150         *p++ = cpu_to_le32((__u32) token_size);
 151         LASSERT(((char *)p - buf) + token_size <= bufsize);
 152
 153         rc = copy_from_user(p, token, token_size);
 154         if (rc) {
 155                 CERROR("can't copy token\n");
 156                 return -EFAULT;
 157         }
 158
 159         rc = size_round(((char *)p - buf) + token_size);
 160         return rc;
 161 }
 162
 163 static int secinit_parse_reply(char *repbuf, int replen,
 164                                char __user *outbuf, long outlen)
 165 {
 166         __u32                   *p = (__u32 *)repbuf;
 167         struct ptlrpcs_wire_hdr *hdr = (struct ptlrpcs_wire_hdr *) repbuf;
 168         __u32                    lmsg_len, sec_len, status;
 169         __u32                    major, minor, seq, obj_len, round_len;
 170         __u32                    effective = 0;
 171
 172         if (replen <= (4 + 6) * 4) {
 173                 CERROR("reply size %d too small\n", replen);
 174                 return -EINVAL;
 175         }
 176
 177         hdr->flavor = le32_to_cpu(hdr->flavor);
 178         hdr->sectype = le32_to_cpu(hdr->sectype);
 179         hdr->msg_len = le32_to_cpu(hdr->msg_len);
 180         hdr->sec_len = le32_to_cpu(hdr->sec_len);
 181
 182         lmsg_len = le32_to_cpu(p[2]);
 183         sec_len = le32_to_cpu(p[3]);
 184
 185         /* sanity checks */
 186         if (hdr->flavor != PTLRPC_SEC_GSS ||
 187             hdr->sectype != PTLRPC_SEC_TYPE_NONE) {
 188                 CERROR("unexpected reply\n");
 189                 return -EINVAL;
 190         }
 191         if (hdr->msg_len % 8 ||
 192             sizeof(*hdr) + hdr->msg_len + hdr->sec_len > replen) {
 193                 CERROR("unexpected reply\n");
 194                 return -EINVAL;
 195         }
 196         if (hdr->sec_len > outlen) {
 197                 CERROR("outbuf too small\n");
 198                 return -EINVAL;
 199         }
 200
 201         p = (__u32 *) buf_to_sec_data(repbuf);
 202         effective = 0;
 203
 204         status = le32_to_cpu(*p++);
 205         major = le32_to_cpu(*p++);
 206         minor = le32_to_cpu(*p++);
 207         seq = le32_to_cpu(*p++);
 208         effective += 4 * 4;
 209
 210         if (copy_to_user(outbuf, &status, 4))
 211                 return -EFAULT;
 212         outbuf += 4;
 213         if (copy_to_user(outbuf, &major, 4))
 214                 return -EFAULT;
 215         outbuf += 4;
 216         if (copy_to_user(outbuf, &minor, 4))
 217                 return -EFAULT;
 218         outbuf += 4;
 219         if (copy_to_user(outbuf, &seq, 4))
 220                 return -EFAULT;
 221         outbuf += 4;
 222
 223         obj_len = le32_to_cpu(*p++);
 224         round_len = (obj_len + 3) & ~ 3;
 225         if (copy_to_user(outbuf, &obj_len, 4))
 226                 return -EFAULT;
 227         outbuf += 4;
 228         if (copy_to_user(outbuf, (char *)p, round_len))
 229                 return -EFAULT;
 230         p += round_len / 4;
 231         outbuf += round_len;
 232         effective += 4 + round_len;
 233
 234         obj_len = le32_to_cpu(*p++);
 235         round_len = (obj_len + 3) & ~ 3;
 236         if (copy_to_user(outbuf, &obj_len, 4))
 237                 return -EFAULT;
 238         outbuf += 4;
 239         if (copy_to_user(outbuf, (char *)p, round_len))
 240                 return -EFAULT;
 241         p += round_len / 4;
 242         outbuf += round_len;
 243         effective += 4 + round_len;
 244
 245         return effective;
 246 }
 247
 248 /* XXX move to where lgssd could see */
 249 struct lgssd_ioctl_param {
 250         int             version;        /* in   */
 251         char           *uuid;           /* in   */
 252         int             lustre_svc;     /* in   */
 253         uid_t           uid;            /* in   */
 254         gid_t           gid;            /* in   */
 255         long            send_token_size;/* in   */
 256         char           *send_token;     /* in   */
 257         long            reply_buf_size; /* in   */
 258         char           *reply_buf;      /* in   */
 259         long            status;         /* out  */
 260         long            reply_length;   /* out  */
 261 };
 262
 263 static int gss_send_secinit_rpc(__user char *buffer, unsigned long count)
 264 {
 265         struct obd_import        *imp;
 266         struct ptlrpc_request    *request = NULL;
 267         struct lgssd_ioctl_param  param;
 268         const int                 reqbuf_size = 1024;
 269         const int                 repbuf_size = 1024;
 270         char                     *reqbuf, *repbuf;
 271         struct obd_device        *obd;
 272         char                      obdname[64];
 273         long                      lsize;
 274         int                       rc, reqlen, replen;
 275
 276         if (count != sizeof(param)) {
 277                 CERROR("ioctl size %lu, expect %d, please check lgssd version\n",
 278                         count, sizeof(param));
 279                 RETURN(-EINVAL);
 280         }
 281         if (copy_from_user(&param, buffer, sizeof(param))) {
 282                 CERROR("failed copy data from lgssd\n");
 283                 RETURN(-EFAULT);
 284         }
 285
 286         if (param.version != GSSD_INTERFACE_VERSION) {
 287                 CERROR("gssd interface version %d (expect %d)\n",
 288                         param.version, GSSD_INTERFACE_VERSION);
 289                 RETURN(-EINVAL);
 290         }
 291
 292         /* take name */
 293         if (strncpy_from_user(obdname, param.uuid,
 294                               sizeof(obdname)) <= 0) {
 295                 CERROR("Invalid obdname pointer\n");
 296                 RETURN(-EFAULT);
 297         }
 298
 299         obd = class_name2obd(obdname);
 300         if (!obd) {
 301                 CERROR("no such obd %s\n", obdname);
 302                 RETURN(-EINVAL);
 303         }
 304
 305         imp = class_import_get(obd->u.cli.cl_import);
 306
 307         OBD_ALLOC(reqbuf, reqbuf_size);
 308         OBD_ALLOC(repbuf, reqbuf_size);
 309
 310         if (!reqbuf || !repbuf) {
 311                 CERROR("Can't alloc buffer: %p/%p\n", reqbuf, repbuf);
 312                 param.status = -ENOMEM;
 313                 goto out_copy;
 314         }
 315
 316         /* get token */
 317         reqlen = secinit_compose_request(imp, reqbuf, reqbuf_size,
 318                                          param.lustre_svc,
 319                                          param.uid, param.gid,
 320                                          param.send_token_size,
 321                                          param.send_token);
 322         if (reqlen < 0) {
 323                 param.status = reqlen;
 324                 goto out_copy;
 325         }
 326
 327         request = ptl_do_rawrpc(imp, reqbuf, reqbuf_size, reqlen,
 328                                 repbuf, repbuf_size, &replen,
 329                                 SECINIT_RPC_TIMEOUT, &rc);
 330         if (request == NULL || rc) {
 331                 param.status = rc;
 332                 goto out_copy;
 333         }
 334
 335         if (replen > param.reply_buf_size) {
 336                 CERROR("output buffer size %ld too small, need %d\n",
 337                         param.reply_buf_size, replen);
 338                 param.status = -EINVAL;
 339                 goto out_copy;
 340         }
 341
 342         lsize = secinit_parse_reply(repbuf, replen,
 343                                     param.reply_buf, param.reply_buf_size);
 344         if (lsize < 0) {
 345                 param.status = (int) lsize;
 346                 goto out_copy;
 347         }
 348
 349         param.status = 0;
 350         param.reply_length = lsize;
 351
 352 out_copy:
 353         if (copy_to_user(buffer, &param, sizeof(param)))
 354                 rc = -EFAULT;
 355         else
 356                 rc = 0;
 357
 358         class_import_put(imp);
 359         if (request == NULL) {
 360                 if (repbuf)
 361                         OBD_FREE(repbuf, repbuf_size);
 362                 if (reqbuf)
 363                         OBD_FREE(reqbuf, reqbuf_size);
 364         } else {
 365                 rawrpc_req_finished(request);
 366         }
 367         RETURN(rc);
 368 }
 369
 370 /**********************************************
 371  * structure definitions                      *
 372  **********************************************/
 373 struct gss_sec {
 374         struct ptlrpc_sec       gs_base;
 375         struct gss_api_mech    *gs_mech;
 376 #ifdef __KERNEL__
 377         spinlock_t              gs_lock;
 378         struct list_head        gs_upcalls;
 379         char                   *gs_pipepath;
 380         struct dentry          *gs_depipe;
 381 #endif
 382 };
 383
 384 #ifdef __KERNEL__
 385
 386 static rwlock_t gss_ctx_lock = RW_LOCK_UNLOCKED;
 387
 388 struct gss_upcall_msg_data {
 389         __u32                           gum_uid;
 390         __u32                           gum_svc;
 391         __u32                           gum_nal;
 392         __u32                           gum_netid;
 393         __u64                           gum_nid;
 394 };
 395
 396 struct gss_upcall_msg {
 397         struct rpc_pipe_msg             gum_base;
 398         atomic_t                        gum_refcount;
 399         struct list_head                gum_list;
 400         struct gss_sec                 *gum_gsec;
 401         wait_queue_head_t               gum_waitq;
 402         char                            gum_obdname[64];
 403         struct gss_upcall_msg_data      gum_data;
 404 };
 405
 406 /**********************************************
 407  * rpc_pipe upcall helpers                    *
 408  **********************************************/
 409 static
 410 void gss_release_msg(struct gss_upcall_msg *gmsg)
 411 {
 412         ENTRY;
 413         LASSERT(atomic_read(&gmsg->gum_refcount) > 0);
 414
 415         if (!atomic_dec_and_test(&gmsg->gum_refcount)) {
 416                 CDEBUG(D_SEC, "gmsg %p ref %d\n", gmsg,
 417                        atomic_read(&gmsg->gum_refcount));
 418                 EXIT;
 419                 return;
 420         }
 421         LASSERT(list_empty(&gmsg->gum_list));
 422         LASSERT(list_empty(&gmsg->gum_base.list));
 423         OBD_FREE(gmsg, sizeof(*gmsg));
 424         EXIT;
 425 }
 426
 427 static void
 428 gss_unhash_msg_nolock(struct gss_upcall_msg *gmsg)
 429 {
 430         ENTRY;
 431         if (list_empty(&gmsg->gum_list)) {
 432                 EXIT;
 433                 return;
 434         }
 435
 436         list_del_init(&gmsg->gum_list);
 437         wake_up(&gmsg->gum_waitq);
 438         atomic_dec(&gmsg->gum_refcount);
 439         CDEBUG(D_SEC, "gmsg %p refcount now %d\n",
 440                gmsg, atomic_read(&gmsg->gum_refcount));
 441         LASSERT(atomic_read(&gmsg->gum_refcount) > 0);
 442         EXIT;
 443 }
 444
 445 static void
 446 gss_unhash_msg(struct gss_upcall_msg *gmsg)
 447 {
 448         struct gss_sec *gsec = gmsg->gum_gsec;
 449
 450         spin_lock(&gsec->gs_lock);
 451         gss_unhash_msg_nolock(gmsg);
 452         spin_unlock(&gsec->gs_lock);
 453 }
 454
 455 static
 456 struct gss_upcall_msg * gss_find_upcall(struct gss_sec *gsec,
 457                                         char *obdname,
 458                                         struct gss_upcall_msg_data *gmd)
 459 {
 460         struct gss_upcall_msg *gmsg;
 461         ENTRY;
 462
 463         list_for_each_entry(gmsg, &gsec->gs_upcalls, gum_list) {
 464                 if (memcmp(&gmsg->gum_data, gmd, sizeof(*gmd)))
 465                         continue;
 466                 if (strcmp(gmsg->gum_obdname, obdname))
 467                         continue;
 468                 atomic_inc(&gmsg->gum_refcount);
 469                 CDEBUG(D_SEC, "found gmsg at %p: obdname %s, uid %d, ref %d\n",
 470                        gmsg, obdname, gmd->gum_uid,
 471                        atomic_read(&gmsg->gum_refcount));
 472                 RETURN(gmsg);
 473         }
 474         RETURN(NULL);
 475 }
 476
 477 static void gss_init_upcall_msg(struct gss_upcall_msg *gmsg,
 478                                 struct gss_sec *gsec, char *obdname,
 479                                 struct gss_upcall_msg_data *gmd)
 480 {
 481         struct rpc_pipe_msg *rpcmsg;
 482         ENTRY;
 483
 484         /* 2 refs: 1 for hash, 1 for current user */
 485         init_waitqueue_head(&gmsg->gum_waitq);
 486         list_add(&gmsg->gum_list, &gsec->gs_upcalls);
 487         atomic_set(&gmsg->gum_refcount, 2);
 488         gmsg->gum_gsec = gsec;
 489         strncpy(gmsg->gum_obdname, obdname, sizeof(gmsg->gum_obdname));
 490         memcpy(&gmsg->gum_data, gmd, sizeof(*gmd));
 491
 492         rpcmsg = &gmsg->gum_base;
 493         rpcmsg->data = &gmsg->gum_data;
 494         rpcmsg->len = sizeof(gmsg->gum_data);
 495         EXIT;
 496 }
 497 #endif /* __KERNEL__ */
 498
 499 /********************************************
 500  * gss cred manipulation helpers            *
 501  ********************************************/
 502 #if 0
 503 static
 504 int gss_cred_is_uptodate_ctx(struct ptlrpc_cred *cred)
 505 {
 506         struct gss_cred *gcred = container_of(cred, struct gss_cred, gc_base);
 507         int res = 0;
 508
 509         read_lock(&gss_ctx_lock);
 510         if (((cred->pc_flags & PTLRPC_CRED_FLAGS_MASK) ==
 511              PTLRPC_CRED_UPTODATE) &&
 512             gcred->gc_ctx)
 513                 res = 1;
 514         read_unlock(&gss_ctx_lock);
 515         return res;
 516 }
 517 #endif
 518
 519 static inline
 520 struct gss_cl_ctx * gss_get_ctx(struct gss_cl_ctx *ctx)
 521 {
 522         atomic_inc(&ctx->gc_refcount);
 523         return ctx;
 524 }
 525
 526 static
 527 void gss_destroy_ctx(struct gss_cl_ctx *ctx)
 528 {
 529         ENTRY;
 530
 531         CDEBUG(D_SEC, "destroy cl_ctx %p\n", ctx);
 532         if (ctx->gc_gss_ctx)
 533                 kgss_delete_sec_context(&ctx->gc_gss_ctx);
 534
 535         if (ctx->gc_wire_ctx.len > 0) {
 536                 OBD_FREE(ctx->gc_wire_ctx.data, ctx->gc_wire_ctx.len);
 537                 ctx->gc_wire_ctx.len = 0;
 538         }
 539
 540         OBD_FREE(ctx, sizeof(*ctx));
 541 }
 542
 543 static
 544 void gss_put_ctx(struct gss_cl_ctx *ctx)
 545 {
 546         if (atomic_dec_and_test(&ctx->gc_refcount))
 547                 gss_destroy_ctx(ctx);
 548 }
 549
 550 static
 551 struct gss_cl_ctx *gss_cred_get_ctx(struct ptlrpc_cred *cred)
 552 {
 553         struct gss_cred *gcred = container_of(cred, struct gss_cred, gc_base);
 554         struct gss_cl_ctx *ctx = NULL;
 555
 556         read_lock(&gss_ctx_lock);
 557         if (gcred->gc_ctx)
 558                 ctx = gss_get_ctx(gcred->gc_ctx);
 559         read_unlock(&gss_ctx_lock);
 560         return ctx;
 561 }
 562
 563 static
 564 void gss_cred_set_ctx(struct ptlrpc_cred *cred, struct gss_cl_ctx *ctx)
 565 {
 566         struct gss_cred *gcred = container_of(cred, struct gss_cred, gc_base);
 567         struct gss_cl_ctx *old;
 568         __u64 ctx_expiry;
 569         ENTRY;
 570
 571         if (kgss_inquire_context(ctx->gc_gss_ctx, &ctx_expiry)) {
 572                 CERROR("unable to get expire time\n");
 573                 ctx_expiry = 1; /* make it expired now */
 574         }
 575         cred->pc_expire = (unsigned long) ctx_expiry;
 576
 577         write_lock(&gss_ctx_lock);
 578         old = gcred->gc_ctx;
 579         gcred->gc_ctx = ctx;
 580         cred->pc_flags |= PTLRPC_CRED_UPTODATE;
 581         write_unlock(&gss_ctx_lock);
 582         if (old)
 583                 gss_put_ctx(old);
 584
 585         CDEBUG(D_SEC, "client refreshed gss cred %p(uid %u)\n",
 586                cred, cred->pc_uid);
 587         EXIT;
 588 }
 589
 590 static int
 591 simple_get_bytes(char **buf, __u32 *buflen, void *res, __u32 reslen)
 592 {
 593         if (*buflen < reslen) {
 594                 CERROR("buflen %u < %u\n", *buflen, reslen);
 595                 return -EINVAL;
 596         }
 597
 598         memcpy(res, *buf, reslen);
 599         *buf += reslen;
 600         *buflen -= reslen;
 601         return 0;
 602 }
 603
 604 /* data passed down:
 605  *  - uid
 606  *  - timeout
 607  *  - gc_win / error
 608  *  - wire_ctx (rawobj)
 609  *  - mech_ctx? (rawobj)
 610  */
 611 static
 612 int gss_parse_init_downcall(struct gss_api_mech *gm, rawobj_t *buf,
 613                             struct gss_cl_ctx **gc,
 614                             struct gss_upcall_msg_data *gmd, int *gss_err)
 615 {
 616         char *p = (char *)buf->data;
 617         struct gss_cl_ctx *ctx;
 618         __u32 len = buf->len;
 619         unsigned int timeout;
 620         rawobj_t tmp_buf;
 621         int err = -EPERM;
 622         ENTRY;
 623
 624         *gc = NULL;
 625         *gss_err = 0;
 626
 627         OBD_ALLOC(ctx, sizeof(*ctx));
 628         if (!ctx)
 629                 RETURN(-ENOMEM);
 630
 631         ctx->gc_proc = RPC_GSS_PROC_DATA;
 632         ctx->gc_seq = 0;
 633         spin_lock_init(&ctx->gc_seq_lock);
 634         atomic_set(&ctx->gc_refcount,1);
 635
 636         if (simple_get_bytes(&p, &len, &gmd->gum_uid, sizeof(gmd->gum_uid)))
 637                 goto err_free_ctx;
 638         if (simple_get_bytes(&p, &len, &gmd->gum_svc, sizeof(gmd->gum_svc)))
 639                 goto err_free_ctx;
 640         if (simple_get_bytes(&p, &len, &gmd->gum_nal, sizeof(gmd->gum_nal)))
 641                 goto err_free_ctx;
 642         if (simple_get_bytes(&p, &len, &gmd->gum_netid, sizeof(gmd->gum_netid)))
 643                 goto err_free_ctx;
 644         if (simple_get_bytes(&p, &len, &gmd->gum_nid, sizeof(gmd->gum_nid)))
 645                 goto err_free_ctx;
 646         /* FIXME: discarded timeout for now */
 647         if (simple_get_bytes(&p, &len, &timeout, sizeof(timeout)))
 648                 goto err_free_ctx;
 649         if (simple_get_bytes(&p, &len, &ctx->gc_win, sizeof(ctx->gc_win)))
 650                 goto err_free_ctx;
 651
 652         /* lgssd signals an error by passing ctx->gc_win = 0: */
 653         if (!ctx->gc_win) {
 654                 /* in which case the next 2 int are:
 655                  * - rpc error
 656                  * - gss error
 657                  */
 658                 if (simple_get_bytes(&p, &len, &err, sizeof(err))) {
 659                         err = -EPERM;
 660                         goto err_free_ctx;
 661                 }
 662                 if (simple_get_bytes(&p, &len, gss_err, sizeof(*gss_err))) {
 663                         err = -EPERM;
 664                         goto err_free_ctx;
 665                 }
 666                 if (err == 0 && *gss_err == 0) {
 667                         CERROR("no error passed from downcall\n");
 668                         err = -EPERM;
 669                 }
 670                 goto err_free_ctx;
 671         }
 672
 673         if (rawobj_extract_local(&tmp_buf, (__u32 **) ((void *)&p), &len))
 674                 goto err_free_ctx;
 675         if (rawobj_dup(&ctx->gc_wire_ctx, &tmp_buf)) {
 676                 err = -ENOMEM;
 677                 goto err_free_ctx;
 678         }
 679         if (rawobj_extract_local(&tmp_buf, (__u32 **) ((void *)&p), &len))
 680                 goto err_free_wire_ctx;
 681         if (len) {
 682                 CERROR("unexpected trailing %u bytes\n", len);
 683                 goto err_free_wire_ctx;
 684         }
 685         if (kgss_import_sec_context(&tmp_buf, gm, &ctx->gc_gss_ctx))
 686                 goto err_free_wire_ctx;
 687
 688         *gc = ctx;
 689         RETURN(0);
 690
 691 err_free_wire_ctx:
 692         if (ctx->gc_wire_ctx.data)
 693                 OBD_FREE(ctx->gc_wire_ctx.data, ctx->gc_wire_ctx.len);
 694 err_free_ctx:
 695         OBD_FREE(ctx, sizeof(*ctx));
 696         CDEBUG(D_SEC, "err_code %d, gss code %d\n", err, *gss_err);
 697         return err;
 698 }
 699
 700 /***************************************
 701  * cred APIs                           *
 702  ***************************************/
 703 #ifdef __KERNEL__
 704 #define CRED_REFRESH_UPCALL_TIMEOUT     (50)
 705 static int gss_cred_refresh(struct ptlrpc_cred *cred)
 706 {
 707         struct obd_import          *import;
 708         struct gss_sec             *gsec;
 709         struct gss_upcall_msg      *gss_msg, *gss_new;
 710         struct gss_upcall_msg_data  gmd;
 711         struct dentry              *dentry;
 712         char                       *obdname, *obdtype;
 713         wait_queue_t                wait;
 714         uid_t                       uid = cred->pc_uid;
 715         int                         res;
 716         ENTRY;
 717
 718         /* any flags means it has been handled, do nothing */
 719         if (cred->pc_flags & PTLRPC_CRED_FLAGS_MASK)
 720                 RETURN(0);
 721
 722         LASSERT(cred->pc_sec);
 723         LASSERT(cred->pc_sec->ps_import);
 724         LASSERT(cred->pc_sec->ps_import->imp_obd);
 725
 726         import = cred->pc_sec->ps_import;
 727         if (!import->imp_connection) {
 728                 CERROR("import has no connection set\n");
 729                 RETURN(-EINVAL);
 730         }
 731
 732         gmd.gum_uid = uid;
 733         gmd.gum_nal = import->imp_connection->c_peer.peer_ni->pni_number;
 734         gmd.gum_netid = 0;
 735         gmd.gum_nid = import->imp_connection->c_peer.peer_id.nid;
 736
 737         obdtype = import->imp_obd->obd_type->typ_name;
 738         if (!strcmp(obdtype, "mdc"))
 739                 gmd.gum_svc = LUSTRE_GSS_SVC_MDS;
 740         else if (!strcmp(obdtype, "osc"))
 741                 gmd.gum_svc = LUSTRE_GSS_SVC_OSS;
 742         else {
 743                 CERROR("gss on %s?\n", obdtype);
 744                 RETURN(-EINVAL);
 745         }
 746
 747         gsec = container_of(cred->pc_sec, struct gss_sec, gs_base);
 748         obdname = import->imp_obd->obd_name;
 749         dentry = gsec->gs_depipe;
 750         gss_new = NULL;
 751         res = 0;
 752
 753         CDEBUG(D_SEC, "Initiate gss context %p(%u@%s)\n",
 754                container_of(cred, struct gss_cred, gc_base),
 755                uid, import->imp_target_uuid.uuid);
 756
 757 again:
 758         spin_lock(&gsec->gs_lock);
 759         gss_msg = gss_find_upcall(gsec, obdname, &gmd);
 760         if (gss_msg) {
 761                 if (gss_new) {
 762                         OBD_FREE(gss_new, sizeof(*gss_new));
 763                         gss_new = NULL;
 764                 }
 765                 GOTO(waiting, res);
 766         }
 767
 768         if (!gss_new) {
 769                 spin_unlock(&gsec->gs_lock);
 770                 OBD_ALLOC(gss_new, sizeof(*gss_new));
 771                 if (!gss_new)
 772                         RETURN(-ENOMEM);
 773                 goto again;
 774         }
 775         /* so far we'v created gss_new */
 776         gss_init_upcall_msg(gss_new, gsec, obdname, &gmd);
 777
 778         /* we'v created upcall msg, nobody else should touch the
 779          * flag of this cred, unless be set as dead/expire by
 780          * administrator via lctl etc.
 781          */
 782         if (cred->pc_flags & PTLRPC_CRED_FLAGS_MASK) {
 783                 CWARN("cred %p("LPU64"/%u) was set flags %x unexpectedly\n",
 784                       cred, cred->pc_pag, cred->pc_uid, cred->pc_flags);
 785                 cred->pc_flags |= PTLRPC_CRED_DEAD | PTLRPC_CRED_ERROR;
 786                 gss_unhash_msg_nolock(gss_new);
 787                 spin_unlock(&gsec->gs_lock);
 788                 gss_release_msg(gss_new);
 789                 RETURN(0);
 790         }
 791
 792         /* need to make upcall now */
 793         spin_unlock(&gsec->gs_lock);
 794         res = rpc_queue_upcall(dentry->d_inode, &gss_new->gum_base);
 795         if (res) {
 796                 CERROR("rpc_queue_upcall failed: %d\n", res);
 797                 gss_unhash_msg(gss_new);
 798                 gss_release_msg(gss_new);
 799                 cred->pc_flags |= PTLRPC_CRED_DEAD | PTLRPC_CRED_ERROR;
 800                 RETURN(res);
 801         }
 802         gss_msg = gss_new;
 803         spin_lock(&gsec->gs_lock);
 804
 805 waiting:
 806         /* upcall might finish quickly */
 807         if (list_empty(&gss_msg->gum_list)) {
 808                 spin_unlock(&gsec->gs_lock);
 809                 res = 0;
 810                 goto out;
 811         }
 812
 813         init_waitqueue_entry(&wait, current);
 814         set_current_state(TASK_INTERRUPTIBLE);
 815         add_wait_queue(&gss_msg->gum_waitq, &wait);
 816         spin_unlock(&gsec->gs_lock);
 817
 818         if (gss_new)
 819                 res = schedule_timeout(CRED_REFRESH_UPCALL_TIMEOUT * HZ);
 820         else {
 821                 schedule();
 822                 res = 0;
 823         }
 824
 825         remove_wait_queue(&gss_msg->gum_waitq, &wait);
 826
 827         /* - the one who refresh the cred for us should also be responsible
 828          *   to set the status of cred, we can simply return.
 829          * - if cred flags has been set, we also don't need to do that again,
 830          *   no matter signal pending or timeout etc.
 831          */
 832         if (!gss_new || cred->pc_flags & PTLRPC_CRED_FLAGS_MASK)
 833                 goto out;
 834
 835         if (signal_pending(current)) {
 836                 CERROR("cred %p: interrupted upcall\n", cred);
 837                 cred->pc_flags |= PTLRPC_CRED_DEAD | PTLRPC_CRED_ERROR;
 838                 res = -EINTR;
 839         } else if (res == 0) {
 840                 CERROR("cred %p: upcall timedout\n", cred);
 841                 cred->pc_flags |= PTLRPC_CRED_DEAD;
 842                 res = -ETIMEDOUT;
 843         } else
 844                 res = 0;
 845
 846 out:
 847         gss_release_msg(gss_msg);
 848
 849         RETURN(res);
 850 }
 851 #else /* !__KERNEL__ */
 852 extern int lgss_handle_krb5_upcall(uid_t uid, __u32 dest_ip,
 853                                    char *obd_name,
 854                                    char *buf, int bufsize,
 855                                    int (*callback)(char*, unsigned long));
 856
 857 static int gss_cred_refresh(struct ptlrpc_cred *cred)
 858 {
 859         char                    buf[4096];
 860         rawobj_t                obj;
 861         struct obd_import      *imp;
 862         struct gss_sec         *gsec;
 863         struct gss_api_mech    *mech;
 864         struct gss_cl_ctx      *ctx = NULL;
 865         struct vfs_cred         vcred = { 0 };
 866         ptl_nid_t               peer_nid;
 867         __u32                   dest_ip;
 868         __u32                   subflavor;
 869         int                     rc, gss_err;
 870
 871         LASSERT(cred);
 872         LASSERT(cred->pc_sec);
 873         LASSERT(cred->pc_sec->ps_import);
 874         LASSERT(cred->pc_sec->ps_import->imp_obd);
 875
 876         if (ptlrpcs_cred_is_uptodate(cred))
 877                 RETURN(0);
 878
 879         imp = cred->pc_sec->ps_import;
 880         peer_nid = imp->imp_connection->c_peer.peer_id.nid;
 881         dest_ip = (__u32) (peer_nid & 0xFFFFFFFF);
 882         subflavor = cred->pc_sec->ps_flavor.subflavor;
 883
 884         if (subflavor != PTLRPC_SEC_GSS_KRB5I) {
 885                 CERROR("unknown subflavor %u\n", subflavor);
 886                 GOTO(err_out, rc = -EINVAL);
 887         }
 888
 889         rc = lgss_handle_krb5_upcall(cred->pc_uid, dest_ip,
 890                                      imp->imp_obd->obd_name,
 891                                      buf, sizeof(buf),
 892                                      gss_send_secinit_rpc);
 893         LASSERT(rc != 0);
 894         if (rc < 0)
 895                 goto err_out;
 896
 897         obj.data = buf;
 898         obj.len = rc;
 899
 900         gsec = container_of(cred->pc_sec, struct gss_sec, gs_base);
 901         mech = gsec->gs_mech;
 902         LASSERT(mech);
 903         rc = gss_parse_init_downcall(mech, &obj, &ctx, &vcred, &dest_ip,
 904                                      &gss_err);
 905         if (rc || gss_err) {
 906                 CERROR("parse init downcall: rpc %d, gss 0x%x\n", rc, gss_err);
 907                 if (rc != -ERESTART || gss_err != 0)
 908                         cred->pc_flags |= PTLRPC_CRED_ERROR;
 909                 if (rc == 0)
 910                         rc = -EPERM;
 911                 goto err_out;
 912         }
 913
 914         LASSERT(ctx);
 915         gss_cred_set_ctx(cred, ctx);
 916         LASSERT(gss_cred_is_uptodate_ctx(cred));
 917
 918         return 0;
 919 err_out:
 920         cred->pc_flags |= PTLRPC_CRED_DEAD;
 921         return rc;
 922 }
 923 #endif
 924
 925 static int gss_cred_match(struct ptlrpc_cred *cred,
 926                           struct vfs_cred *vcred)
 927 {
 928         RETURN(cred->pc_pag == vcred->vc_pag);
 929 }
 930
 931 static int gss_cred_sign(struct ptlrpc_cred *cred,
 932                          struct ptlrpc_request *req)
 933 {
 934         struct gss_cred         *gcred;
 935         struct gss_cl_ctx       *ctx;
 936         rawobj_t                 lmsg, mic;
 937         __u32                   *vp, *vpsave, vlen, seclen;
 938         __u32                    seqnum, major, rc = 0;
 939         ENTRY;
 940
 941         LASSERT(req->rq_reqbuf);
 942         LASSERT(req->rq_cred == cred);
 943
 944         gcred = container_of(cred, struct gss_cred, gc_base);
 945         ctx = gss_cred_get_ctx(cred);
 946         if (!ctx) {
 947                 CERROR("cred %p("LPU64"/%u) invalidated?\n",
 948                         cred, cred->pc_pag, cred->pc_uid);
 949                 RETURN(-EPERM);
 950         }
 951
 952         lmsg.len = req->rq_reqlen;
 953         lmsg.data = (__u8 *) req->rq_reqmsg;
 954
 955         vp = (__u32 *) (lmsg.data + lmsg.len);
 956         vlen = req->rq_reqbuf_len - sizeof(struct ptlrpcs_wire_hdr) -
 957                lmsg.len;
 958         seclen = vlen;
 959
 960         if (vlen < 6 * 4 + size_round4(ctx->gc_wire_ctx.len)) {
 961                 CERROR("vlen %d, need %d\n",
 962                         vlen, 6 * 4 + size_round4(ctx->gc_wire_ctx.len));
 963                 rc = -EIO;
 964                 goto out;
 965         }
 966
 967         spin_lock(&ctx->gc_seq_lock);
 968         seqnum = ctx->gc_seq++;
 969         spin_unlock(&ctx->gc_seq_lock);
 970
 971         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);    /* version */
 972         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);      /* subflavor */
 973         *vp++ = cpu_to_le32(ctx->gc_proc);              /* proc */
 974         *vp++ = cpu_to_le32(seqnum);                    /* seq */
 975         *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_INTEGRITY);  /* service */
 976         vlen -= 5 * 4;
 977
 978         if (rawobj_serialize(&ctx->gc_wire_ctx, &vp, &vlen)) {
 979                 rc = -EIO;
 980                 goto out;
 981         }
 982         CDEBUG(D_SEC, "encoded wire_ctx length %d\n", ctx->gc_wire_ctx.len);
 983
 984         vpsave = vp++;  /* reserve for size */
 985         vlen -= 4;
 986
 987         mic.len = vlen;
 988         mic.data = (unsigned char *)vp;
 989
 990         CDEBUG(D_SEC, "reqbuf at %p, lmsg at %p, len %d, mic at %p, len %d\n",
 991                req->rq_reqbuf, lmsg.data, lmsg.len, mic.data, mic.len);
 992         major = kgss_get_mic(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT, &lmsg, &mic);
 993         if (major) {
 994                 CERROR("gss compute mic error, major %x\n", major);
 995                 rc = -EACCES;
 996                 goto out;
 997         }
 998
 999         *vpsave = cpu_to_le32(mic.len);
1000
1001         seclen = seclen - vlen + mic.len;
1002         buf_to_sec_hdr(req->rq_reqbuf)->sec_len = cpu_to_le32(seclen);
1003         req->rq_reqdata_len += size_round(seclen);
1004         CDEBUG(D_SEC, "msg size %d, checksum size %d, total sec size %d\n",
1005                lmsg.len, mic.len, seclen);
1006 out:
1007         gss_put_ctx(ctx);
1008         RETURN(rc);
1009 }
1010
1011 static int gss_cred_verify(struct ptlrpc_cred *cred,
1012                            struct ptlrpc_request *req)
1013 {
1014         struct gss_cred        *gcred;
1015         struct gss_cl_ctx      *ctx;
1016         struct ptlrpcs_wire_hdr *sec_hdr;
1017         rawobj_t                lmsg, mic;
1018         __u32                   *vp, vlen, subflavor, proc, seq, svc;
1019         __u32                   major, minor, rc;
1020         ENTRY;
1021
1022         LASSERT(req->rq_repbuf);
1023         LASSERT(req->rq_cred == cred);
1024
1025         sec_hdr = buf_to_sec_hdr(req->rq_repbuf);
1026         vp = (__u32 *) (req->rq_repbuf + sizeof(*sec_hdr) + sec_hdr->msg_len);
1027         vlen = sec_hdr->sec_len;
1028
1029         if (vlen < 7 * 4) {
1030                 CERROR("reply sec size %u too small\n", vlen);
1031                 RETURN(-EPROTO);
1032         }
1033
1034         if (*vp++ != cpu_to_le32(PTLRPC_SEC_GSS_VERSION)) {
1035                 CERROR("reply have different gss version\n");
1036                 RETURN(-EPROTO);
1037         }
1038         subflavor = le32_to_cpu(*vp++);
1039         proc = le32_to_cpu(*vp++);
1040         vlen -= 3 * 4;
1041
1042         switch (proc) {
1043         case PTLRPC_GSS_PROC_DATA:
1044                 seq = le32_to_cpu(*vp++);
1045                 svc = le32_to_cpu(*vp++);
1046                 if (svc != PTLRPC_GSS_SVC_INTEGRITY) {
1047                         CERROR("Unknown svc %d\n", svc);
1048                         RETURN(-EPROTO);
1049                 }
1050                 if (*vp++ != 0) {
1051                         CERROR("Unexpected ctx handle\n");
1052                         RETURN(-EPROTO);
1053                 }
1054                 mic.len = le32_to_cpu(*vp++);
1055                 vlen -= 4 * 4;
1056                 if (vlen < mic.len) {
1057                         CERROR("vlen %d, mic.len %d\n", vlen, mic.len);
1058                         RETURN(-EINVAL);
1059                 }
1060                 mic.data = (unsigned char *)vp;
1061
1062                 gcred = container_of(cred, struct gss_cred, gc_base);
1063                 ctx = gss_cred_get_ctx(cred);
1064                 LASSERT(ctx);
1065
1066                 lmsg.len = sec_hdr->msg_len;
1067                 lmsg.data = (__u8 *) buf_to_lustre_msg(req->rq_repbuf);
1068
1069                 major = kgss_verify_mic(ctx->gc_gss_ctx, &lmsg, &mic, NULL);
1070                 if (major != GSS_S_COMPLETE) {
1071                         CERROR("gss verify mic error: major %x\n", major);
1072                         GOTO(proc_data_out, rc = -EINVAL);
1073                 }
1074
1075                 req->rq_repmsg = (struct lustre_msg *) lmsg.data;
1076                 req->rq_replen = lmsg.len;
1077
1078                 /* here we could check the seq number is the same one
1079                  * we sent to server. but portals has prevent us from
1080                  * replay attack, so maybe we don't need check it again.
1081                  */
1082                 rc = 0;
1083 proc_data_out:
1084                 gss_put_ctx(ctx);
1085                 break;
1086         case PTLRPC_GSS_PROC_ERR:
1087                 major = le32_to_cpu(*vp++);
1088                 minor = le32_to_cpu(*vp++);
1089                 /* server return NO_CONTEXT might be caused by context expire
1090                  * or server reboot/failover. we refresh the cred transparently
1091                  * to upper layer.
1092                  * In some cases, our gss handle is possible to be incidentally
1093                  * identical to another handle since the handle itself is not
1094                  * fully random. In krb5 case, the GSS_S_BAD_SIG will be
1095                  * returned, maybe other gss error for other mechanism. Here we
1096                  * only consider krb5 mech (FIXME) and try to establish new
1097                  * context.
1098                  */
1099                 if (major == GSS_S_NO_CONTEXT ||
1100                     major == GSS_S_BAD_SIG) {
1101                         CWARN("req %p: server report cred %p %s, expired?\n",
1102                                req, cred, (major == GSS_S_NO_CONTEXT) ?
1103                                            "NO_CONTEXT" : "BAD_SIG");
1104
1105                         ptlrpcs_cred_die(cred);
1106                         rc = ptlrpcs_req_replace_dead_cred(req);
1107                         if (!rc)
1108                                 req->rq_ptlrpcs_restart = 1;
1109                         else
1110                                 CERROR("replace dead cred failed %d\n", rc);
1111                 } else {
1112                         CERROR("req %p: unrecognized gss error (%x/%x)\n",
1113                                 req, major, minor);
1114                         rc = -EACCES;
1115                 }
1116                 break;
1117         default:
1118                 CERROR("unknown gss proc %d\n", proc);
1119                 rc = -EPROTO;
1120         }
1121
1122         RETURN(rc);
1123 }
1124
1125 static int gss_cred_seal(struct ptlrpc_cred *cred,
1126                          struct ptlrpc_request *req)
1127 {
1128         struct gss_cred         *gcred;
1129         struct gss_cl_ctx       *ctx;
1130         struct ptlrpcs_wire_hdr *sec_hdr;
1131         rawobj_buf_t             msg_buf;
1132         rawobj_t                 cipher_buf;
1133         __u32                   *vp, *vpsave, vlen, seclen;
1134         __u32                    major, seqnum, rc = 0;
1135         ENTRY;
1136
1137         LASSERT(req->rq_reqbuf);
1138         LASSERT(req->rq_cred == cred);
1139
1140         gcred = container_of(cred, struct gss_cred, gc_base);
1141         ctx = gss_cred_get_ctx(cred);
1142         if (!ctx) {
1143                 CERROR("cred %p("LPU64"/%u) invalidated?\n",
1144                         cred, cred->pc_pag, cred->pc_uid);
1145                 RETURN(-EPERM);
1146         }
1147
1148         vp = (__u32 *) (req->rq_reqbuf + sizeof(*sec_hdr));
1149         vlen = req->rq_reqbuf_len - sizeof(*sec_hdr);
1150         seclen = vlen;
1151
1152         if (vlen < 6 * 4 + size_round4(ctx->gc_wire_ctx.len)) {
1153                 CERROR("vlen %d, need %d\n",
1154                         vlen, 6 * 4 + size_round4(ctx->gc_wire_ctx.len));
1155                 rc = -EIO;
1156                 goto out;
1157         }
1158
1159         spin_lock(&ctx->gc_seq_lock);
1160         seqnum = ctx->gc_seq++;
1161         spin_unlock(&ctx->gc_seq_lock);
1162
1163         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);    /* version */
1164         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5P);      /* subflavor */
1165         *vp++ = cpu_to_le32(ctx->gc_proc);              /* proc */
1166         *vp++ = cpu_to_le32(seqnum);                    /* seq */
1167         *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_PRIVACY);    /* service */
1168         vlen -= 5 * 4;
1169
1170         if (rawobj_serialize(&ctx->gc_wire_ctx, &vp, &vlen)) {
1171                 rc = -EIO;
1172                 goto out;
1173         }
1174         CDEBUG(D_SEC, "encoded wire_ctx length %d\n", ctx->gc_wire_ctx.len);
1175
1176         vpsave = vp++;  /* reserve for size */
1177         vlen -= 4;
1178
1179         msg_buf.buf = (__u8 *) req->rq_reqmsg - GSS_PRIVBUF_PREFIX_LEN;
1180         msg_buf.buflen = req->rq_reqlen + GSS_PRIVBUF_PREFIX_LEN + GSS_PRIVBUF_SUFFIX_LEN;
1181         msg_buf.dataoff = GSS_PRIVBUF_PREFIX_LEN;
1182         msg_buf.datalen = req->rq_reqlen;
1183
1184         cipher_buf.data = (__u8 *) vp;
1185         cipher_buf.len = vlen;
1186
1187         major = kgss_wrap(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT,
1188                           &msg_buf, &cipher_buf);
1189         if (major) {
1190                 CERROR("error wrap: major 0x%x\n", major);
1191                 GOTO(out, rc = -EINVAL);
1192         }
1193
1194         *vpsave = cpu_to_le32(cipher_buf.len);
1195
1196         seclen = seclen - vlen + cipher_buf.len;
1197         sec_hdr = buf_to_sec_hdr(req->rq_reqbuf);
1198         sec_hdr->sec_len = cpu_to_le32(seclen);
1199         req->rq_reqdata_len += size_round(seclen);
1200
1201         CDEBUG(D_SEC, "msg size %d, total sec size %d\n",
1202                req->rq_reqlen, seclen);
1203 out:
1204         gss_put_ctx(ctx);
1205         RETURN(rc);
1206 }
1207
1208 static int gss_cred_unseal(struct ptlrpc_cred *cred,
1209                            struct ptlrpc_request *req)
1210 {
1211         struct gss_cred        *gcred;
1212         struct gss_cl_ctx      *ctx;
1213         struct ptlrpcs_wire_hdr *sec_hdr;
1214         rawobj_t                cipher_text, plain_text;
1215         __u32                   *vp, vlen, subflavor, proc, seq, svc;
1216         int                     rc;
1217         ENTRY;
1218
1219         LASSERT(req->rq_repbuf);
1220         LASSERT(req->rq_cred == cred);
1221
1222         sec_hdr = buf_to_sec_hdr(req->rq_repbuf);
1223         if (sec_hdr->msg_len != 0) {
1224                 CERROR("unexpected msg_len %u\n", sec_hdr->msg_len);
1225                 RETURN(-EPROTO);
1226         }
1227
1228         vp = (__u32 *) (req->rq_repbuf + sizeof(*sec_hdr));
1229         vlen = sec_hdr->sec_len;
1230
1231         if (vlen < 7 * 4) {
1232                 CERROR("reply sec size %u too small\n", vlen);
1233                 RETURN(-EPROTO);
1234         }
1235
1236         if (*vp++ != cpu_to_le32(PTLRPC_SEC_GSS_VERSION)) {
1237                 CERROR("reply have different gss version\n");
1238                 RETURN(-EPROTO);
1239         }
1240         subflavor = le32_to_cpu(*vp++);
1241         proc = le32_to_cpu(*vp++);
1242         seq = le32_to_cpu(*vp++);
1243         svc = le32_to_cpu(*vp++);
1244         vlen -= 5 * 4;
1245
1246         switch (proc) {
1247         case PTLRPC_GSS_PROC_DATA:
1248                 if (svc != PTLRPC_GSS_SVC_PRIVACY) {
1249                         CERROR("Unknown svc %d\n", svc);
1250                         RETURN(-EPROTO);
1251                 }
1252                 if (*vp++ != 0) {
1253                         CERROR("Unexpected ctx handle\n");
1254                         RETURN(-EPROTO);
1255                 }
1256                 vlen -= 4;
1257
1258                 cipher_text.len = le32_to_cpu(*vp++);
1259                 cipher_text.data = (__u8 *) vp;
1260                 vlen -= 4;
1261
1262                 if (vlen < cipher_text.len) {
1263                         CERROR("cipher text to be %u while buf only %u\n",
1264                                 cipher_text.len, vlen);
1265                         RETURN(-EPROTO);
1266                 }
1267
1268                 plain_text = cipher_text;
1269
1270                 gcred = container_of(cred, struct gss_cred, gc_base);
1271                 ctx = gss_cred_get_ctx(cred);
1272                 LASSERT(ctx);
1273
1274                 rc = kgss_unwrap(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT,
1275                                  &cipher_text, &plain_text);
1276                 if (rc) {
1277                         CERROR("error unwrap: 0x%x\n", rc);
1278                         GOTO(proc_out, rc = -EINVAL);
1279                 }
1280
1281                 req->rq_repmsg = (struct lustre_msg *) vp;
1282                 req->rq_replen = plain_text.len;
1283
1284                 rc = 0;
1285 proc_out:
1286                 gss_put_ctx(ctx);
1287                 break;
1288         default:
1289                 CERROR("unknown gss proc %d\n", proc);
1290                 rc = -EPROTO;
1291         }
1292
1293         RETURN(rc);
1294 }
1295
1296 static void destroy_gss_context(struct ptlrpc_cred *cred)
1297 {
1298         struct ptlrpcs_wire_hdr *hdr;
1299         struct lustre_msg       *lmsg;
1300         struct gss_cred         *gcred;
1301         struct ptlrpc_request    req;
1302         struct obd_import       *imp;
1303         __u32                   *vp, lmsg_size;
1304         struct ptlrpc_request   *raw_req = NULL;
1305         const int                repbuf_len = 256;
1306         char                    *repbuf;
1307         int                      replen, rc;
1308         ENTRY;
1309
1310         /* cred's refcount is 0, steal one */
1311         atomic_inc(&cred->pc_refcount);
1312
1313         gcred = container_of(cred, struct gss_cred, gc_base);
1314         gcred->gc_ctx->gc_proc = PTLRPC_GSS_PROC_DESTROY;
1315         imp = cred->pc_sec->ps_import;
1316         LASSERT(imp);
1317
1318         if (!(cred->pc_flags & PTLRPC_CRED_UPTODATE)) {
1319                 CDEBUG(D_SEC, "Destroy a dead gss cred %p(%u@%s)\n",
1320                        gcred, cred->pc_uid, imp->imp_target_uuid.uuid);
1321                 atomic_dec(&cred->pc_refcount);
1322                 EXIT;
1323                 return;
1324         }
1325
1326         CDEBUG(D_SEC, "client destroy gss cred %p(%u@%s)\n",
1327                gcred, cred->pc_uid, imp->imp_target_uuid.uuid);
1328
1329         lmsg_size = lustre_msg_size(0, NULL);
1330         req.rq_reqbuf_len = sizeof(*hdr) + lmsg_size +
1331                             ptlrpcs_est_req_payload(cred->pc_sec, lmsg_size);
1332
1333         OBD_ALLOC(req.rq_reqbuf, req.rq_reqbuf_len);
1334         if (!req.rq_reqbuf) {
1335                 CERROR("Fail to alloc reqbuf, cancel anyway\n");
1336                 atomic_dec(&cred->pc_refcount);
1337                 EXIT;
1338                 return;
1339         }
1340
1341         /* wire hdr */
1342         hdr = buf_to_sec_hdr(req.rq_reqbuf);
1343         hdr->flavor  = cpu_to_le32(PTLRPC_SEC_GSS);
1344         hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_AUTH);
1345         hdr->msg_len = cpu_to_le32(lmsg_size);
1346         hdr->sec_len = cpu_to_le32(0);
1347
1348         /* lustre message */
1349         lmsg = buf_to_lustre_msg(req.rq_reqbuf);
1350         lustre_init_msg(lmsg, 0, NULL, NULL);
1351         lmsg->handle   = imp->imp_remote_handle;
1352         lmsg->type     = PTL_RPC_MSG_REQUEST;
1353         lmsg->opc      = SEC_FINI;
1354         lmsg->flags    = 0;
1355         lmsg->conn_cnt = imp->imp_conn_cnt;
1356         /* add this for randomize */
1357         get_random_bytes(&lmsg->last_xid, sizeof(lmsg->last_xid));
1358         get_random_bytes(&lmsg->transno, sizeof(lmsg->transno));
1359
1360         vp = (__u32 *) req.rq_reqbuf;
1361
1362         req.rq_cred = cred;
1363         req.rq_reqmsg = buf_to_lustre_msg(req.rq_reqbuf);
1364         req.rq_reqlen = lmsg_size;
1365         req.rq_reqdata_len = sizeof(*hdr) + lmsg_size;
1366
1367         if (gss_cred_sign(cred, &req)) {
1368                 CERROR("failed to sign, cancel anyway\n");
1369                 atomic_dec(&cred->pc_refcount);
1370                 goto exit;
1371         }
1372         atomic_dec(&cred->pc_refcount);
1373
1374         OBD_ALLOC(repbuf, repbuf_len);
1375         if (!repbuf)
1376                 goto exit;
1377
1378         raw_req = ptl_do_rawrpc(imp, req.rq_reqbuf, req.rq_reqbuf_len,
1379                                 req.rq_reqdata_len, repbuf, repbuf_len, &replen,
1380                                 SECFINI_RPC_TIMEOUT, &rc);
1381         if (!raw_req)
1382                 OBD_FREE(repbuf, repbuf_len);
1383
1384 exit:
1385         if (raw_req == NULL)
1386                 OBD_FREE(req.rq_reqbuf, req.rq_reqbuf_len);
1387         else
1388                 rawrpc_req_finished(raw_req);
1389         EXIT;
1390 }
1391
1392 static void gss_cred_destroy(struct ptlrpc_cred *cred)
1393 {
1394         struct gss_cred *gcred;
1395         ENTRY;
1396
1397         LASSERT(cred);
1398         LASSERT(!atomic_read(&cred->pc_refcount));
1399
1400         gcred = container_of(cred, struct gss_cred, gc_base);
1401         if (gcred->gc_ctx) {
1402                 destroy_gss_context(cred);
1403                 gss_put_ctx(gcred->gc_ctx);
1404         }
1405
1406         CDEBUG(D_SEC, "GSS_SEC: destroy cred %p\n", gcred);
1407
1408         OBD_FREE(gcred, sizeof(*gcred));
1409         EXIT;
1410 }
1411
1412 static struct ptlrpc_credops gss_credops = {
1413         .refresh        = gss_cred_refresh,
1414         .match          = gss_cred_match,
1415         .sign           = gss_cred_sign,
1416         .verify         = gss_cred_verify,
1417         .seal           = gss_cred_seal,
1418         .unseal         = gss_cred_unseal,
1419         .destroy        = gss_cred_destroy,
1420 };
1421
1422 #ifdef __KERNEL__
1423 /*******************************************
1424  * rpc_pipe APIs                           *
1425  *******************************************/
1426 static ssize_t
1427 gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
1428                 char *dst, size_t buflen)
1429 {
1430         char *data = (char *)msg->data + msg->copied;
1431         ssize_t mlen = msg->len;
1432         ssize_t left;
1433         ENTRY;
1434
1435         if (mlen > buflen)
1436                 mlen = buflen;
1437         left = copy_to_user(dst, data, mlen);
1438         if (left < 0) {
1439                 msg->errno = left;
1440                 RETURN(left);
1441         }
1442         mlen -= left;
1443         msg->copied += mlen;
1444         msg->errno = 0;
1445         RETURN(mlen);
1446 }
1447
1448 static ssize_t
1449 gss_pipe_downcall(struct file *filp, const char *src, size_t mlen)
1450 {
1451         char *buf;
1452         const int bufsize = 1024;
1453         rawobj_t obj;
1454         struct inode *inode = filp->f_dentry->d_inode;
1455         struct rpc_inode *rpci = RPC_I(inode);
1456         struct obd_import *import;
1457         struct ptlrpc_sec *sec;
1458         struct gss_sec *gsec;
1459         char *obdname;
1460         struct gss_api_mech *mech;
1461         struct vfs_cred vcred = { 0 };
1462         struct ptlrpc_cred *cred;
1463         struct gss_upcall_msg *gss_msg;
1464         struct gss_upcall_msg_data gmd = { 0 };
1465         struct gss_cl_ctx *ctx = NULL;
1466         ssize_t left;
1467         int err, gss_err;
1468         ENTRY;
1469
1470         if (mlen > bufsize) {
1471                 CERROR("mlen %ld > bufsize %d\n", (long)mlen, bufsize);
1472                 RETURN(-ENOSPC);
1473         }
1474
1475         OBD_ALLOC(buf, bufsize);
1476         if (!buf) {
1477                 CERROR("alloc mem failed\n");
1478                 RETURN(-ENOMEM);
1479         }
1480
1481         left = copy_from_user(buf, src, mlen);
1482         if (left)
1483                 GOTO(err_free, err = -EFAULT);
1484
1485         obj.data = (unsigned char *)buf;
1486         obj.len = mlen;
1487
1488         LASSERT(rpci->private);
1489         gsec = (struct gss_sec *)rpci->private;
1490         sec = &gsec->gs_base;
1491         LASSERT(sec->ps_import);
1492         import = class_import_get(sec->ps_import);
1493         LASSERT(import->imp_obd);
1494         obdname = import->imp_obd->obd_name;
1495         mech = gsec->gs_mech;
1496
1497         err = gss_parse_init_downcall(mech, &obj, &ctx, &gmd, &gss_err);
1498         if (err)
1499                 CERROR("parse init downcall err %d\n", err);
1500
1501         vcred.vc_uid = gmd.gum_uid;
1502         vcred.vc_pag = vcred.vc_uid; /* FIXME */
1503
1504         cred = ptlrpcs_cred_lookup(sec, &vcred);
1505         if (!cred) {
1506                 CWARN("didn't find cred for uid %u\n", vcred.vc_uid);
1507                 GOTO(err, err = -EINVAL);
1508         }
1509
1510         if (err || gss_err) {
1511                 cred->pc_flags |= PTLRPC_CRED_DEAD;
1512                 if (err != -ERESTART || gss_err != 0)
1513                         cred->pc_flags |= PTLRPC_CRED_ERROR;
1514                 CERROR("cred %p: rpc err %d, gss err 0x%x, fatal %d\n",
1515                         cred, err, gss_err,
1516                         ((cred->pc_flags & PTLRPC_CRED_ERROR) != 0));
1517         } else {
1518                 CDEBUG(D_SEC, "get initial ctx:\n");
1519                 gss_cred_set_ctx(cred, ctx);
1520         }
1521
1522         spin_lock(&gsec->gs_lock);
1523         gss_msg = gss_find_upcall(gsec, obdname, &gmd);
1524         if (gss_msg) {
1525                 gss_unhash_msg_nolock(gss_msg);
1526                 spin_unlock(&gsec->gs_lock);
1527                 gss_release_msg(gss_msg);
1528         } else
1529                 spin_unlock(&gsec->gs_lock);
1530
1531         ptlrpcs_cred_put(cred, 1);
1532         class_import_put(import);
1533         OBD_FREE(buf, bufsize);
1534         RETURN(mlen);
1535 err:
1536         if (ctx)
1537                 gss_destroy_ctx(ctx);
1538         class_import_put(import);
1539 err_free:
1540         OBD_FREE(buf, bufsize);
1541         CDEBUG(D_SEC, "gss_pipe_downcall returning %d\n", err);
1542         RETURN(err);
1543 }
1544
1545 static
1546 void gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
1547 {
1548         struct gss_upcall_msg *gmsg;
1549         static unsigned long ratelimit;
1550         ENTRY;
1551
1552         if (msg->errno >= 0) {
1553                 EXIT;
1554                 return;
1555         }
1556
1557         gmsg = container_of(msg, struct gss_upcall_msg, gum_base);
1558         CDEBUG(D_SEC, "destroy gmsg %p\n", gmsg);
1559         atomic_inc(&gmsg->gum_refcount);
1560         gss_unhash_msg(gmsg);
1561         if (msg->errno == -ETIMEDOUT || msg->errno == -EPIPE) {
1562                 unsigned long now = get_seconds();
1563                 if (time_after(now, ratelimit)) {
1564                         CWARN("GSS_SEC upcall timed out.\n"
1565                               "Please check user daemon is running!\n");
1566                         ratelimit = now + 15;
1567                 }
1568         }
1569         gss_release_msg(gmsg);
1570         EXIT;
1571 }
1572
1573 static
1574 void gss_pipe_release(struct inode *inode)
1575 {
1576         struct rpc_inode *rpci = RPC_I(inode);
1577         struct ptlrpc_sec *sec;
1578         struct gss_sec *gsec;
1579         ENTRY;
1580
1581         gsec = (struct gss_sec *)rpci->private;
1582         sec = &gsec->gs_base;
1583         spin_lock(&gsec->gs_lock);
1584         while (!list_empty(&gsec->gs_upcalls)) {
1585                 struct gss_upcall_msg *gmsg;
1586
1587                 gmsg = list_entry(gsec->gs_upcalls.next,
1588                                   struct gss_upcall_msg, gum_list);
1589                 gmsg->gum_base.errno = -EPIPE;
1590                 atomic_inc(&gmsg->gum_refcount);
1591                 gss_unhash_msg_nolock(gmsg);
1592                 gss_release_msg(gmsg);
1593         }
1594         spin_unlock(&gsec->gs_lock);
1595         EXIT;
1596 }
1597
1598 static struct rpc_pipe_ops gss_upcall_ops = {
1599         .upcall         = gss_pipe_upcall,
1600         .downcall       = gss_pipe_downcall,
1601         .destroy_msg    = gss_pipe_destroy_msg,
1602         .release_pipe   = gss_pipe_release,
1603 };
1604 #endif /* __KERNEL__ */
1605
1606 /*********************************************
1607  * GSS security APIs                         *
1608  *********************************************/
1609
1610 static
1611 struct ptlrpc_sec* gss_create_sec(ptlrpcs_flavor_t *flavor,
1612                                   const char *pipe_dir,
1613                                   void *pipe_data)
1614 {
1615         struct gss_sec *gsec;
1616         struct ptlrpc_sec *sec;
1617 #ifdef __KERNEL__
1618         char *pos;
1619         int   pipepath_len;
1620 #endif
1621         ENTRY;
1622
1623         LASSERT(flavor->flavor == PTLRPC_SEC_GSS);
1624
1625         OBD_ALLOC(gsec, sizeof(*gsec));
1626         if (!gsec) {
1627                 CERROR("can't alloc gsec\n");
1628                 RETURN(NULL);
1629         }
1630
1631         gsec->gs_mech = kgss_subflavor_to_mech(flavor->subflavor);
1632         if (!gsec->gs_mech) {
1633                 CERROR("subflavor %d not found\n", flavor->subflavor);
1634                 goto err_free;
1635         }
1636
1637         /* initialize gss sec */
1638 #ifdef __KERNEL__
1639         INIT_LIST_HEAD(&gsec->gs_upcalls);
1640         spin_lock_init(&gsec->gs_lock);
1641
1642         pipepath_len = strlen(LUSTRE_PIPEDIR) + strlen(pipe_dir) +
1643                        strlen(gsec->gs_mech->gm_name) + 3;
1644         OBD_ALLOC(gsec->gs_pipepath, pipepath_len);
1645         if (!gsec->gs_pipepath)
1646                 goto err_mech_put;
1647
1648         sprintf(gsec->gs_pipepath, LUSTRE_PIPEDIR"/%s", pipe_dir);
1649         if (IS_ERR(rpc_mkdir(gsec->gs_pipepath, NULL))) {
1650                 CERROR("can't make pipedir %s\n", gsec->gs_pipepath);
1651                 goto err_free_path;
1652         }
1653
1654         sprintf(gsec->gs_pipepath, LUSTRE_PIPEDIR"/%s/%s", pipe_dir,
1655                 gsec->gs_mech->gm_name);
1656         gsec->gs_depipe = rpc_mkpipe(gsec->gs_pipepath, gsec,
1657                                      &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
1658         if (IS_ERR(gsec->gs_depipe)) {
1659                 CERROR("failed to make rpc_pipe %s: %ld\n",
1660                         gsec->gs_pipepath, PTR_ERR(gsec->gs_depipe));
1661                 goto err_rmdir;
1662         }
1663         CDEBUG(D_SEC, "gss sec %p, pipe path %s\n", gsec, gsec->gs_pipepath);
1664 #endif
1665
1666         sec = &gsec->gs_base;
1667
1668         switch (flavor->subflavor) {
1669         case PTLRPC_SEC_GSS_KRB5I:
1670                 sec->ps_sectype = PTLRPC_SEC_TYPE_AUTH;
1671                 break;
1672         case PTLRPC_SEC_GSS_KRB5P:
1673                 sec->ps_sectype = PTLRPC_SEC_TYPE_PRIV;
1674                 break;
1675         default:
1676                 LBUG();
1677         }
1678
1679         sec->ps_expire = GSS_CREDCACHE_EXPIRE;
1680         sec->ps_nextgc = get_seconds() + sec->ps_expire;
1681         sec->ps_flags = 0;
1682
1683         CDEBUG(D_SEC, "Create GSS security instance at %p(external %p)\n",
1684                gsec, sec);
1685         RETURN(sec);
1686
1687 #ifdef __KERNEL__
1688 err_rmdir:
1689         pos = strrchr(gsec->gs_pipepath, '/');
1690         LASSERT(pos);
1691         *pos = 0;
1692         rpc_rmdir(gsec->gs_pipepath);
1693 err_free_path:
1694         OBD_FREE(gsec->gs_pipepath, pipepath_len);
1695 err_mech_put:
1696 #endif
1697         kgss_mech_put(gsec->gs_mech);
1698 err_free:
1699         OBD_FREE(gsec, sizeof(*gsec));
1700         RETURN(NULL);
1701 }
1702
1703 static
1704 void gss_destroy_sec(struct ptlrpc_sec *sec)
1705 {
1706         struct gss_sec *gsec;
1707 #ifdef __KERNEL__
1708         char *pos;
1709         int   pipepath_len;
1710 #endif
1711         ENTRY;
1712
1713         gsec = container_of(sec, struct gss_sec, gs_base);
1714         CDEBUG(D_SEC, "Destroy GSS security instance at %p\n", gsec);
1715
1716         LASSERT(gsec->gs_mech);
1717         LASSERT(!atomic_read(&sec->ps_refcount));
1718         LASSERT(!atomic_read(&sec->ps_credcount));
1719 #ifdef __KERNEL__
1720         pipepath_len = strlen(gsec->gs_pipepath) + 1;
1721         rpc_unlink(gsec->gs_pipepath);
1722         pos = strrchr(gsec->gs_pipepath, '/');
1723         LASSERT(pos);
1724         *pos = 0;
1725         rpc_rmdir(gsec->gs_pipepath);
1726         OBD_FREE(gsec->gs_pipepath, pipepath_len);
1727 #endif
1728
1729         kgss_mech_put(gsec->gs_mech);
1730         OBD_FREE(gsec, sizeof(*gsec));
1731         EXIT;
1732 }
1733
1734 static
1735 struct ptlrpc_cred * gss_create_cred(struct ptlrpc_sec *sec,
1736                                      struct vfs_cred *vcred)
1737 {
1738         struct gss_cred *gcred;
1739         struct ptlrpc_cred *cred;
1740         ENTRY;
1741
1742         OBD_ALLOC(gcred, sizeof(*gcred));
1743         if (!gcred)
1744                 RETURN(NULL);
1745
1746         cred = &gcred->gc_base;
1747         INIT_LIST_HEAD(&cred->pc_hash);
1748         atomic_set(&cred->pc_refcount, 0);
1749         cred->pc_sec = sec;
1750         cred->pc_ops = &gss_credops;
1751         cred->pc_expire = get_seconds() + GSS_CRED_EXPIRE;
1752         cred->pc_flags = 0;
1753         cred->pc_pag = vcred->vc_pag;
1754         cred->pc_uid = vcred->vc_uid;
1755         CDEBUG(D_SEC, "create a gss cred at %p("LPU64"/%u)\n",
1756                cred, vcred->vc_pag, vcred->vc_uid);
1757
1758         RETURN(cred);
1759 }
1760
1761 static int gss_estimate_payload(struct ptlrpc_sec *sec, int msgsize)
1762 {
1763         switch (sec->ps_sectype) {
1764         case PTLRPC_SEC_TYPE_AUTH:
1765                 return GSS_MAX_AUTH_PAYLOAD;
1766         case PTLRPC_SEC_TYPE_PRIV:
1767                 return size_round16(GSS_MAX_AUTH_PAYLOAD + msgsize +
1768                                     GSS_PRIVBUF_PREFIX_LEN +
1769                                     GSS_PRIVBUF_SUFFIX_LEN);
1770         default:
1771                 LBUG();
1772                 return 0;
1773         }
1774 }
1775
1776 static int gss_alloc_reqbuf(struct ptlrpc_sec *sec,
1777                             struct ptlrpc_request *req,
1778                             int lmsg_size)
1779 {
1780         int msg_payload, sec_payload;
1781         int privacy, rc;
1782         ENTRY;
1783
1784         /* In PRIVACY mode, lustre message is always 0 (already encoded into
1785          * security payload).
1786          */
1787         privacy = sec->ps_sectype == PTLRPC_SEC_TYPE_PRIV;
1788         msg_payload = privacy ? 0 : lmsg_size;
1789         sec_payload = gss_estimate_payload(sec, lmsg_size);
1790
1791         rc = sec_alloc_reqbuf(sec, req, msg_payload, sec_payload);
1792         if (rc)
1793                 return rc;
1794
1795         if (privacy) {
1796                 int buflen = lmsg_size + GSS_PRIVBUF_PREFIX_LEN +
1797                              GSS_PRIVBUF_SUFFIX_LEN;
1798                 char *buf;
1799
1800                 OBD_ALLOC(buf, buflen);
1801                 if (!buf) {
1802                         CERROR("Fail to alloc %d\n", buflen);
1803                         sec_free_reqbuf(sec, req);
1804                         RETURN(-ENOMEM);
1805                 }
1806                 req->rq_reqmsg = (struct lustre_msg *)
1807                                         (buf + GSS_PRIVBUF_PREFIX_LEN);
1808         }
1809
1810         RETURN(0);
1811 }
1812
1813 static void gss_free_reqbuf(struct ptlrpc_sec *sec,
1814                             struct ptlrpc_request *req)
1815 {
1816         char *buf;
1817         int privacy;
1818         ENTRY;
1819
1820         LASSERT(req->rq_reqmsg);
1821         LASSERT(req->rq_reqlen);
1822
1823         privacy = sec->ps_sectype == PTLRPC_SEC_TYPE_PRIV;
1824         if (privacy) {
1825                 buf = (char *) req->rq_reqmsg - GSS_PRIVBUF_PREFIX_LEN;
1826                 LASSERT(buf < req->rq_reqbuf ||
1827                         buf >= req->rq_reqbuf + req->rq_reqbuf_len);
1828                 OBD_FREE(buf, req->rq_reqlen + GSS_PRIVBUF_PREFIX_LEN +
1829                               GSS_PRIVBUF_SUFFIX_LEN);
1830                 req->rq_reqmsg = NULL;
1831         }
1832
1833         sec_free_reqbuf(sec, req);
1834 }
1835
1836 static struct ptlrpc_secops gss_secops = {
1837         .create_sec             = gss_create_sec,
1838         .destroy_sec            = gss_destroy_sec,
1839         .create_cred            = gss_create_cred,
1840         .est_req_payload        = gss_estimate_payload,
1841         .est_rep_payload        = gss_estimate_payload,
1842         .alloc_reqbuf           = gss_alloc_reqbuf,
1843         .free_reqbuf            = gss_free_reqbuf,
1844 };
1845
1846 static struct ptlrpc_sec_type gss_type = {
1847         .pst_owner      = THIS_MODULE,
1848         .pst_name       = "GSS_SEC",
1849         .pst_inst       = ATOMIC_INIT(0),
1850         .pst_flavor     = {PTLRPC_SEC_GSS, 0},
1851         .pst_ops        = &gss_secops,
1852 };
1853
1854 extern int
1855 (*lustre_secinit_downcall_handler)(char *buffer, unsigned long count);
1856
1857 int __init ptlrpcs_gss_init(void)
1858 {
1859         int rc;
1860
1861         rc = ptlrpcs_register(&gss_type);
1862         if (rc)
1863                 return rc;
1864
1865 #ifdef __KERNEL__
1866         gss_svc_init();
1867
1868         rc = PTR_ERR(rpc_mkdir(LUSTRE_PIPEDIR, NULL));
1869         if (IS_ERR((void *)rc) && rc != -EEXIST) {
1870                 CERROR("fail to make rpcpipedir for lustre\n");
1871                 gss_svc_exit();
1872                 ptlrpcs_unregister(&gss_type);
1873                 return -1;
1874         }
1875         rc = 0;
1876 #else
1877 #endif
1878         rc = init_kerberos_module();
1879         if (rc) {
1880                 ptlrpcs_unregister(&gss_type);
1881         }
1882
1883         lustre_secinit_downcall_handler = gss_send_secinit_rpc;
1884
1885         return rc;
1886 }
1887
1888 #ifdef __KERNEL__
1889 static void __exit ptlrpcs_gss_exit(void)
1890 {
1891         lustre_secinit_downcall_handler = NULL;
1892
1893         cleanup_kerberos_module();
1894         rpc_rmdir(LUSTRE_PIPEDIR);
1895         gss_svc_exit();
1896         ptlrpcs_unregister(&gss_type);
1897 }
1898 #endif
1899
1900 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1901 MODULE_DESCRIPTION("GSS Security module for Lustre");
1902 MODULE_LICENSE("GPL");
1903
1904 module_init(ptlrpcs_gss_init);
1905 module_exit(ptlrpcs_gss_exit);