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("%s: cred %p: interrupted upcall\n",
 837                        current->comm, cred);
 838                 cred->pc_flags |= PTLRPC_CRED_DEAD | PTLRPC_CRED_ERROR;
 839                 res = -EINTR;
 840         } else if (res == 0) {
 841                 CERROR("cred %p: upcall timedout\n", cred);
 842                 cred->pc_flags |= PTLRPC_CRED_DEAD;
 843                 res = -ETIMEDOUT;
 844         } else
 845                 res = 0;
 846
 847 out:
 848         gss_release_msg(gss_msg);
 849
 850         RETURN(res);
 851 }
 852 #else /* !__KERNEL__ */
 853 extern int lgss_handle_krb5_upcall(uid_t uid, __u32 dest_ip,
 854                                    char *obd_name,
 855                                    char *buf, int bufsize,
 856                                    int (*callback)(char*, unsigned long));
 857
 858 static int gss_cred_refresh(struct ptlrpc_cred *cred)
 859 {
 860         char                    buf[4096];
 861         rawobj_t                obj;
 862         struct obd_import      *imp;
 863         struct gss_sec         *gsec;
 864         struct gss_api_mech    *mech;
 865         struct gss_cl_ctx      *ctx = NULL;
 866         struct vfs_cred         vcred = { 0 };
 867         ptl_nid_t               peer_nid;
 868         __u32                   dest_ip;
 869         __u32                   subflavor;
 870         int                     rc, gss_err;
 871
 872         LASSERT(cred);
 873         LASSERT(cred->pc_sec);
 874         LASSERT(cred->pc_sec->ps_import);
 875         LASSERT(cred->pc_sec->ps_import->imp_obd);
 876
 877         if (ptlrpcs_cred_is_uptodate(cred))
 878                 RETURN(0);
 879
 880         imp = cred->pc_sec->ps_import;
 881         peer_nid = imp->imp_connection->c_peer.peer_id.nid;
 882         dest_ip = (__u32) (peer_nid & 0xFFFFFFFF);
 883         subflavor = cred->pc_sec->ps_flavor.subflavor;
 884
 885         if (subflavor != PTLRPC_SEC_GSS_KRB5I) {
 886                 CERROR("unknown subflavor %u\n", subflavor);
 887                 GOTO(err_out, rc = -EINVAL);
 888         }
 889
 890         rc = lgss_handle_krb5_upcall(cred->pc_uid, dest_ip,
 891                                      imp->imp_obd->obd_name,
 892                                      buf, sizeof(buf),
 893                                      gss_send_secinit_rpc);
 894         LASSERT(rc != 0);
 895         if (rc < 0)
 896                 goto err_out;
 897
 898         obj.data = buf;
 899         obj.len = rc;
 900
 901         gsec = container_of(cred->pc_sec, struct gss_sec, gs_base);
 902         mech = gsec->gs_mech;
 903         LASSERT(mech);
 904         rc = gss_parse_init_downcall(mech, &obj, &ctx, &vcred, &dest_ip,
 905                                      &gss_err);
 906         if (rc || gss_err) {
 907                 CERROR("parse init downcall: rpc %d, gss 0x%x\n", rc, gss_err);
 908                 if (rc != -ERESTART || gss_err != 0)
 909                         cred->pc_flags |= PTLRPC_CRED_ERROR;
 910                 if (rc == 0)
 911                         rc = -EPERM;
 912                 goto err_out;
 913         }
 914
 915         LASSERT(ctx);
 916         gss_cred_set_ctx(cred, ctx);
 917         LASSERT(gss_cred_is_uptodate_ctx(cred));
 918
 919         return 0;
 920 err_out:
 921         cred->pc_flags |= PTLRPC_CRED_DEAD;
 922         return rc;
 923 }
 924 #endif
 925
 926 static int gss_cred_match(struct ptlrpc_cred *cred,
 927                           struct vfs_cred *vcred)
 928 {
 929         RETURN(cred->pc_pag == vcred->vc_pag);
 930 }
 931
 932 static int gss_cred_sign(struct ptlrpc_cred *cred,
 933                          struct ptlrpc_request *req)
 934 {
 935         struct gss_cred         *gcred;
 936         struct gss_cl_ctx       *ctx;
 937         rawobj_t                 lmsg, mic;
 938         __u32                   *vp, *vpsave, vlen, seclen;
 939         __u32                    seqnum, major, rc = 0;
 940         ENTRY;
 941
 942         LASSERT(req->rq_reqbuf);
 943         LASSERT(req->rq_cred == cred);
 944
 945         gcred = container_of(cred, struct gss_cred, gc_base);
 946         ctx = gss_cred_get_ctx(cred);
 947         if (!ctx) {
 948                 CERROR("cred %p("LPU64"/%u) invalidated?\n",
 949                         cred, cred->pc_pag, cred->pc_uid);
 950                 RETURN(-EPERM);
 951         }
 952
 953         lmsg.len = req->rq_reqlen;
 954         lmsg.data = (__u8 *) req->rq_reqmsg;
 955
 956         vp = (__u32 *) (lmsg.data + lmsg.len);
 957         vlen = req->rq_reqbuf_len - sizeof(struct ptlrpcs_wire_hdr) -
 958                lmsg.len;
 959         seclen = vlen;
 960
 961         if (vlen < 6 * 4 + size_round4(ctx->gc_wire_ctx.len)) {
 962                 CERROR("vlen %d, need %d\n",
 963                         vlen, 6 * 4 + size_round4(ctx->gc_wire_ctx.len));
 964                 rc = -EIO;
 965                 goto out;
 966         }
 967
 968         spin_lock(&ctx->gc_seq_lock);
 969         seqnum = ctx->gc_seq++;
 970         spin_unlock(&ctx->gc_seq_lock);
 971
 972         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);    /* version */
 973         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5I);      /* subflavor */
 974         *vp++ = cpu_to_le32(ctx->gc_proc);              /* proc */
 975         *vp++ = cpu_to_le32(seqnum);                    /* seq */
 976         *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_INTEGRITY);  /* service */
 977         vlen -= 5 * 4;
 978
 979         if (rawobj_serialize(&ctx->gc_wire_ctx, &vp, &vlen)) {
 980                 rc = -EIO;
 981                 goto out;
 982         }
 983         CDEBUG(D_SEC, "encoded wire_ctx length %d\n", ctx->gc_wire_ctx.len);
 984
 985         vpsave = vp++;  /* reserve for size */
 986         vlen -= 4;
 987
 988         mic.len = vlen;
 989         mic.data = (unsigned char *)vp;
 990
 991         CDEBUG(D_SEC, "reqbuf at %p, lmsg at %p, len %d, mic at %p, len %d\n",
 992                req->rq_reqbuf, lmsg.data, lmsg.len, mic.data, mic.len);
 993         major = kgss_get_mic(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT, &lmsg, &mic);
 994         if (major) {
 995                 CERROR("cred %p: req %p compute mic error, major %x\n",
 996                        cred, req, major);
 997                 rc = -EACCES;
 998                 goto out;
 999         }
1000
1001         *vpsave = cpu_to_le32(mic.len);
1002
1003         seclen = seclen - vlen + mic.len;
1004         buf_to_sec_hdr(req->rq_reqbuf)->sec_len = cpu_to_le32(seclen);
1005         req->rq_reqdata_len += size_round(seclen);
1006         CDEBUG(D_SEC, "msg size %d, checksum size %d, total sec size %d\n",
1007                lmsg.len, mic.len, seclen);
1008 out:
1009         gss_put_ctx(ctx);
1010         RETURN(rc);
1011 }
1012
1013 static int gss_cred_verify(struct ptlrpc_cred *cred,
1014                            struct ptlrpc_request *req)
1015 {
1016         struct gss_cred        *gcred;
1017         struct gss_cl_ctx      *ctx;
1018         struct ptlrpcs_wire_hdr *sec_hdr;
1019         rawobj_t                lmsg, mic;
1020         __u32                   *vp, vlen, subflavor, proc, seq, svc;
1021         __u32                   major, minor, rc;
1022         ENTRY;
1023
1024         LASSERT(req->rq_repbuf);
1025         LASSERT(req->rq_cred == cred);
1026
1027         sec_hdr = buf_to_sec_hdr(req->rq_repbuf);
1028         vp = (__u32 *) (req->rq_repbuf + sizeof(*sec_hdr) + sec_hdr->msg_len);
1029         vlen = sec_hdr->sec_len;
1030
1031         if (vlen < 7 * 4) {
1032                 CERROR("reply sec size %u too small\n", vlen);
1033                 RETURN(-EPROTO);
1034         }
1035
1036         if (*vp++ != cpu_to_le32(PTLRPC_SEC_GSS_VERSION)) {
1037                 CERROR("reply have different gss version\n");
1038                 RETURN(-EPROTO);
1039         }
1040         subflavor = le32_to_cpu(*vp++);
1041         proc = le32_to_cpu(*vp++);
1042         vlen -= 3 * 4;
1043
1044         switch (proc) {
1045         case PTLRPC_GSS_PROC_DATA:
1046                 seq = le32_to_cpu(*vp++);
1047                 svc = le32_to_cpu(*vp++);
1048                 if (svc != PTLRPC_GSS_SVC_INTEGRITY) {
1049                         CERROR("Unknown svc %d\n", svc);
1050                         RETURN(-EPROTO);
1051                 }
1052                 if (*vp++ != 0) {
1053                         CERROR("Unexpected ctx handle\n");
1054                         RETURN(-EPROTO);
1055                 }
1056                 mic.len = le32_to_cpu(*vp++);
1057                 vlen -= 4 * 4;
1058                 if (vlen < mic.len) {
1059                         CERROR("vlen %d, mic.len %d\n", vlen, mic.len);
1060                         RETURN(-EINVAL);
1061                 }
1062                 mic.data = (unsigned char *)vp;
1063
1064                 gcred = container_of(cred, struct gss_cred, gc_base);
1065                 ctx = gss_cred_get_ctx(cred);
1066                 LASSERT(ctx);
1067
1068                 lmsg.len = sec_hdr->msg_len;
1069                 lmsg.data = (__u8 *) buf_to_lustre_msg(req->rq_repbuf);
1070
1071                 major = kgss_verify_mic(ctx->gc_gss_ctx, &lmsg, &mic, NULL);
1072                 if (major != GSS_S_COMPLETE) {
1073                         CERROR("cred %p: req %p verify mic error: major %x\n",
1074                                cred, req, major);
1075
1076                         if (major == GSS_S_CREDENTIALS_EXPIRED ||
1077                             major == GSS_S_CONTEXT_EXPIRED) {
1078                                 ptlrpcs_cred_expire(cred);
1079                                 req->rq_ptlrpcs_restart = 1;
1080                                 rc = 0;
1081                         } else
1082                                 rc = -EINVAL;
1083
1084                         GOTO(proc_data_out, rc);
1085                 }
1086
1087                 req->rq_repmsg = (struct lustre_msg *) lmsg.data;
1088                 req->rq_replen = lmsg.len;
1089
1090                 /* here we could check the seq number is the same one
1091                  * we sent to server. but portals has prevent us from
1092                  * replay attack, so maybe we don't need check it again.
1093                  */
1094                 rc = 0;
1095 proc_data_out:
1096                 gss_put_ctx(ctx);
1097                 break;
1098         case PTLRPC_GSS_PROC_ERR:
1099                 major = le32_to_cpu(*vp++);
1100                 minor = le32_to_cpu(*vp++);
1101                 /* server return NO_CONTEXT might be caused by context expire
1102                  * or server reboot/failover. we refresh the cred transparently
1103                  * to upper layer.
1104                  * In some cases, our gss handle is possible to be incidentally
1105                  * identical to another handle since the handle itself is not
1106                  * fully random. In krb5 case, the GSS_S_BAD_SIG will be
1107                  * returned, maybe other gss error for other mechanism. Here we
1108                  * only consider krb5 mech (FIXME) and try to establish new
1109                  * context.
1110                  */
1111                 if (major == GSS_S_NO_CONTEXT ||
1112                     major == GSS_S_BAD_SIG) {
1113                         CWARN("req %p: server report cred %p %s, expired?\n",
1114                                req, cred, (major == GSS_S_NO_CONTEXT) ?
1115                                            "NO_CONTEXT" : "BAD_SIG");
1116
1117                         ptlrpcs_cred_expire(cred);
1118                         req->rq_ptlrpcs_restart = 1;
1119                         rc = 0;
1120                 } else {
1121                         CERROR("req %p: unrecognized gss error (%x/%x)\n",
1122                                 req, major, minor);
1123                         rc = -EACCES;
1124                 }
1125                 break;
1126         default:
1127                 CERROR("unknown gss proc %d\n", proc);
1128                 rc = -EPROTO;
1129         }
1130
1131         RETURN(rc);
1132 }
1133
1134 static int gss_cred_seal(struct ptlrpc_cred *cred,
1135                          struct ptlrpc_request *req)
1136 {
1137         struct gss_cred         *gcred;
1138         struct gss_cl_ctx       *ctx;
1139         struct ptlrpcs_wire_hdr *sec_hdr;
1140         rawobj_buf_t             msg_buf;
1141         rawobj_t                 cipher_buf;
1142         __u32                   *vp, *vpsave, vlen, seclen;
1143         __u32                    major, seqnum, rc = 0;
1144         ENTRY;
1145
1146         LASSERT(req->rq_reqbuf);
1147         LASSERT(req->rq_cred == cred);
1148
1149         gcred = container_of(cred, struct gss_cred, gc_base);
1150         ctx = gss_cred_get_ctx(cred);
1151         if (!ctx) {
1152                 CERROR("cred %p("LPU64"/%u) invalidated?\n",
1153                         cred, cred->pc_pag, cred->pc_uid);
1154                 RETURN(-EPERM);
1155         }
1156
1157         vp = (__u32 *) (req->rq_reqbuf + sizeof(*sec_hdr));
1158         vlen = req->rq_reqbuf_len - sizeof(*sec_hdr);
1159         seclen = vlen;
1160
1161         if (vlen < 6 * 4 + size_round4(ctx->gc_wire_ctx.len)) {
1162                 CERROR("vlen %d, need %d\n",
1163                         vlen, 6 * 4 + size_round4(ctx->gc_wire_ctx.len));
1164                 rc = -EIO;
1165                 goto out;
1166         }
1167
1168         spin_lock(&ctx->gc_seq_lock);
1169         seqnum = ctx->gc_seq++;
1170         spin_unlock(&ctx->gc_seq_lock);
1171
1172         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_VERSION);    /* version */
1173         *vp++ = cpu_to_le32(PTLRPC_SEC_GSS_KRB5P);      /* subflavor */
1174         *vp++ = cpu_to_le32(ctx->gc_proc);              /* proc */
1175         *vp++ = cpu_to_le32(seqnum);                    /* seq */
1176         *vp++ = cpu_to_le32(PTLRPC_GSS_SVC_PRIVACY);    /* service */
1177         vlen -= 5 * 4;
1178
1179         if (rawobj_serialize(&ctx->gc_wire_ctx, &vp, &vlen)) {
1180                 rc = -EIO;
1181                 goto out;
1182         }
1183         CDEBUG(D_SEC, "encoded wire_ctx length %d\n", ctx->gc_wire_ctx.len);
1184
1185         vpsave = vp++;  /* reserve for size */
1186         vlen -= 4;
1187
1188         msg_buf.buf = (__u8 *) req->rq_reqmsg - GSS_PRIVBUF_PREFIX_LEN;
1189         msg_buf.buflen = req->rq_reqlen + GSS_PRIVBUF_PREFIX_LEN +
1190                                           GSS_PRIVBUF_SUFFIX_LEN;
1191         msg_buf.dataoff = GSS_PRIVBUF_PREFIX_LEN;
1192         msg_buf.datalen = req->rq_reqlen;
1193
1194         cipher_buf.data = (__u8 *) vp;
1195         cipher_buf.len = vlen;
1196
1197         major = kgss_wrap(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT,
1198                           &msg_buf, &cipher_buf);
1199         if (major) {
1200                 CERROR("cred %p: error wrap: major 0x%x\n", cred, major);
1201                 GOTO(out, rc = -EINVAL);
1202         }
1203
1204         *vpsave = cpu_to_le32(cipher_buf.len);
1205
1206         seclen = seclen - vlen + cipher_buf.len;
1207         sec_hdr = buf_to_sec_hdr(req->rq_reqbuf);
1208         sec_hdr->sec_len = cpu_to_le32(seclen);
1209         req->rq_reqdata_len += size_round(seclen);
1210
1211         CDEBUG(D_SEC, "msg size %d, total sec size %d\n",
1212                req->rq_reqlen, seclen);
1213 out:
1214         gss_put_ctx(ctx);
1215         RETURN(rc);
1216 }
1217
1218 static int gss_cred_unseal(struct ptlrpc_cred *cred,
1219                            struct ptlrpc_request *req)
1220 {
1221         struct gss_cred        *gcred;
1222         struct gss_cl_ctx      *ctx;
1223         struct ptlrpcs_wire_hdr *sec_hdr;
1224         rawobj_t                cipher_text, plain_text;
1225         __u32                   *vp, vlen, subflavor, proc, seq, svc;
1226         __u32                   major, rc;
1227         ENTRY;
1228
1229         LASSERT(req->rq_repbuf);
1230         LASSERT(req->rq_cred == cred);
1231
1232         sec_hdr = buf_to_sec_hdr(req->rq_repbuf);
1233         if (sec_hdr->msg_len != 0) {
1234                 CERROR("unexpected msg_len %u\n", sec_hdr->msg_len);
1235                 RETURN(-EPROTO);
1236         }
1237
1238         vp = (__u32 *) (req->rq_repbuf + sizeof(*sec_hdr));
1239         vlen = sec_hdr->sec_len;
1240
1241         if (vlen < 7 * 4) {
1242                 CERROR("reply sec size %u too small\n", vlen);
1243                 RETURN(-EPROTO);
1244         }
1245
1246         if (*vp++ != cpu_to_le32(PTLRPC_SEC_GSS_VERSION)) {
1247                 CERROR("reply have different gss version\n");
1248                 RETURN(-EPROTO);
1249         }
1250         subflavor = le32_to_cpu(*vp++);
1251         proc = le32_to_cpu(*vp++);
1252         seq = le32_to_cpu(*vp++);
1253         svc = le32_to_cpu(*vp++);
1254         vlen -= 5 * 4;
1255
1256         switch (proc) {
1257         case PTLRPC_GSS_PROC_DATA:
1258                 if (svc != PTLRPC_GSS_SVC_PRIVACY) {
1259                         CERROR("Unknown svc %d\n", svc);
1260                         RETURN(-EPROTO);
1261                 }
1262                 if (*vp++ != 0) {
1263                         CERROR("Unexpected ctx handle\n");
1264                         RETURN(-EPROTO);
1265                 }
1266                 vlen -= 4;
1267
1268                 cipher_text.len = le32_to_cpu(*vp++);
1269                 cipher_text.data = (__u8 *) vp;
1270                 vlen -= 4;
1271
1272                 if (vlen < cipher_text.len) {
1273                         CERROR("cipher text to be %u while buf only %u\n",
1274                                 cipher_text.len, vlen);
1275                         RETURN(-EPROTO);
1276                 }
1277
1278                 plain_text = cipher_text;
1279
1280                 gcred = container_of(cred, struct gss_cred, gc_base);
1281                 ctx = gss_cred_get_ctx(cred);
1282                 LASSERT(ctx);
1283
1284                 major = kgss_unwrap(ctx->gc_gss_ctx, GSS_C_QOP_DEFAULT,
1285                                     &cipher_text, &plain_text);
1286                 if (major) {
1287                         CERROR("cred %p: error unwrap: major 0x%x\n",
1288                                cred, major);
1289
1290                         if (major == GSS_S_CREDENTIALS_EXPIRED ||
1291                             major == GSS_S_CONTEXT_EXPIRED) {
1292                                 ptlrpcs_cred_expire(cred);
1293                                 req->rq_ptlrpcs_restart = 1;
1294                                 rc = 0;
1295                         } else
1296                                 rc = -EINVAL;
1297
1298                         GOTO(proc_out, rc);
1299                 }
1300
1301                 req->rq_repmsg = (struct lustre_msg *) vp;
1302                 req->rq_replen = plain_text.len;
1303
1304                 rc = 0;
1305 proc_out:
1306                 gss_put_ctx(ctx);
1307                 break;
1308         default:
1309                 CERROR("unknown gss proc %d\n", proc);
1310                 rc = -EPROTO;
1311         }
1312
1313         RETURN(rc);
1314 }
1315
1316 static void destroy_gss_context(struct ptlrpc_cred *cred)
1317 {
1318         struct ptlrpcs_wire_hdr *hdr;
1319         struct lustre_msg       *lmsg;
1320         struct gss_cred         *gcred;
1321         struct ptlrpc_request    req;
1322         struct obd_import       *imp;
1323         __u32                   *vp, lmsg_size;
1324         struct ptlrpc_request   *raw_req = NULL;
1325         const int                repbuf_len = 256;
1326         char                    *repbuf;
1327         int                      replen, rc;
1328         ENTRY;
1329
1330         /* cred's refcount is 0, steal one */
1331         atomic_inc(&cred->pc_refcount);
1332
1333         if (!(cred->pc_flags & PTLRPC_CRED_UPTODATE)) {
1334                 CDEBUG(D_SEC, "Destroy dead cred %p(%u@%s)\n",
1335                        cred, cred->pc_uid, imp->imp_target_uuid.uuid);
1336                 atomic_dec(&cred->pc_refcount);
1337                 EXIT;
1338                 return;
1339         }
1340
1341         gcred = container_of(cred, struct gss_cred, gc_base);
1342         gcred->gc_ctx->gc_proc = PTLRPC_GSS_PROC_DESTROY;
1343         imp = cred->pc_sec->ps_import;
1344         LASSERT(imp);
1345
1346         CDEBUG(D_SEC, "client destroy gss cred %p(%u@%s)\n",
1347                gcred, cred->pc_uid, imp->imp_target_uuid.uuid);
1348
1349         lmsg_size = lustre_msg_size(0, NULL);
1350         req.rq_reqbuf_len = sizeof(*hdr) + lmsg_size +
1351                             ptlrpcs_est_req_payload(cred->pc_sec, lmsg_size);
1352
1353         OBD_ALLOC(req.rq_reqbuf, req.rq_reqbuf_len);
1354         if (!req.rq_reqbuf) {
1355                 CERROR("Fail to alloc reqbuf, cancel anyway\n");
1356                 atomic_dec(&cred->pc_refcount);
1357                 EXIT;
1358                 return;
1359         }
1360
1361         /* wire hdr */
1362         hdr = buf_to_sec_hdr(req.rq_reqbuf);
1363         hdr->flavor  = cpu_to_le32(PTLRPC_SEC_GSS);
1364         hdr->sectype = cpu_to_le32(PTLRPC_SEC_TYPE_AUTH);
1365         hdr->msg_len = cpu_to_le32(lmsg_size);
1366         hdr->sec_len = cpu_to_le32(0);
1367
1368         /* lustre message */
1369         lmsg = buf_to_lustre_msg(req.rq_reqbuf);
1370         lustre_init_msg(lmsg, 0, NULL, NULL);
1371         lmsg->handle   = imp->imp_remote_handle;
1372         lmsg->type     = PTL_RPC_MSG_REQUEST;
1373         lmsg->opc      = SEC_FINI;
1374         lmsg->flags    = 0;
1375         lmsg->conn_cnt = imp->imp_conn_cnt;
1376         /* add this for randomize */
1377         get_random_bytes(&lmsg->last_xid, sizeof(lmsg->last_xid));
1378         get_random_bytes(&lmsg->transno, sizeof(lmsg->transno));
1379
1380         vp = (__u32 *) req.rq_reqbuf;
1381
1382         req.rq_cred = cred;
1383         req.rq_reqmsg = buf_to_lustre_msg(req.rq_reqbuf);
1384         req.rq_reqlen = lmsg_size;
1385         req.rq_reqdata_len = sizeof(*hdr) + lmsg_size;
1386
1387         if (gss_cred_sign(cred, &req)) {
1388                 CERROR("failed to sign, cancel anyway\n");
1389                 atomic_dec(&cred->pc_refcount);
1390                 goto exit;
1391         }
1392         atomic_dec(&cred->pc_refcount);
1393
1394         OBD_ALLOC(repbuf, repbuf_len);
1395         if (!repbuf)
1396                 goto exit;
1397
1398         raw_req = ptl_do_rawrpc(imp, req.rq_reqbuf, req.rq_reqbuf_len,
1399                                 req.rq_reqdata_len, repbuf, repbuf_len, &replen,
1400                                 SECFINI_RPC_TIMEOUT, &rc);
1401         if (!raw_req)
1402                 OBD_FREE(repbuf, repbuf_len);
1403
1404 exit:
1405         if (raw_req == NULL)
1406                 OBD_FREE(req.rq_reqbuf, req.rq_reqbuf_len);
1407         else
1408                 rawrpc_req_finished(raw_req);
1409         EXIT;
1410 }
1411
1412 static void gss_cred_destroy(struct ptlrpc_cred *cred)
1413 {
1414         struct gss_cred *gcred;
1415         ENTRY;
1416
1417         LASSERT(cred);
1418         LASSERT(!atomic_read(&cred->pc_refcount));
1419
1420         gcred = container_of(cred, struct gss_cred, gc_base);
1421         if (gcred->gc_ctx) {
1422                 destroy_gss_context(cred);
1423                 gss_put_ctx(gcred->gc_ctx);
1424         }
1425
1426         CDEBUG(D_SEC, "GSS_SEC: destroy cred %p\n", gcred);
1427
1428         OBD_FREE(gcred, sizeof(*gcred));
1429         EXIT;
1430 }
1431
1432 static struct ptlrpc_credops gss_credops = {
1433         .refresh        = gss_cred_refresh,
1434         .match          = gss_cred_match,
1435         .sign           = gss_cred_sign,
1436         .verify         = gss_cred_verify,
1437         .seal           = gss_cred_seal,
1438         .unseal         = gss_cred_unseal,
1439         .destroy        = gss_cred_destroy,
1440 };
1441
1442 #ifdef __KERNEL__
1443 /*******************************************
1444  * rpc_pipe APIs                           *
1445  *******************************************/
1446 static ssize_t
1447 gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
1448                 char *dst, size_t buflen)
1449 {
1450         char *data = (char *)msg->data + msg->copied;
1451         ssize_t mlen = msg->len;
1452         ssize_t left;
1453         ENTRY;
1454
1455         if (mlen > buflen)
1456                 mlen = buflen;
1457         left = copy_to_user(dst, data, mlen);
1458         if (left < 0) {
1459                 msg->errno = left;
1460                 RETURN(left);
1461         }
1462         mlen -= left;
1463         msg->copied += mlen;
1464         msg->errno = 0;
1465         RETURN(mlen);
1466 }
1467
1468 static ssize_t
1469 gss_pipe_downcall(struct file *filp, const char *src, size_t mlen)
1470 {
1471         char *buf;
1472         const int bufsize = 1024;
1473         rawobj_t obj;
1474         struct inode *inode = filp->f_dentry->d_inode;
1475         struct rpc_inode *rpci = RPC_I(inode);
1476         struct obd_import *import;
1477         struct ptlrpc_sec *sec;
1478         struct gss_sec *gsec;
1479         char *obdname;
1480         struct gss_api_mech *mech;
1481         struct vfs_cred vcred = { 0 };
1482         struct ptlrpc_cred *cred;
1483         struct gss_upcall_msg *gss_msg;
1484         struct gss_upcall_msg_data gmd = { 0 };
1485         struct gss_cl_ctx *ctx = NULL;
1486         ssize_t left;
1487         int err, gss_err;
1488         ENTRY;
1489
1490         if (mlen > bufsize) {
1491                 CERROR("mlen %ld > bufsize %d\n", (long)mlen, bufsize);
1492                 RETURN(-ENOSPC);
1493         }
1494
1495         OBD_ALLOC(buf, bufsize);
1496         if (!buf) {
1497                 CERROR("alloc mem failed\n");
1498                 RETURN(-ENOMEM);
1499         }
1500
1501         left = copy_from_user(buf, src, mlen);
1502         if (left)
1503                 GOTO(err_free, err = -EFAULT);
1504
1505         obj.data = (unsigned char *)buf;
1506         obj.len = mlen;
1507
1508         LASSERT(rpci->private);
1509         gsec = (struct gss_sec *)rpci->private;
1510         sec = &gsec->gs_base;
1511         LASSERT(sec->ps_import);
1512         import = class_import_get(sec->ps_import);
1513         LASSERT(import->imp_obd);
1514         obdname = import->imp_obd->obd_name;
1515         mech = gsec->gs_mech;
1516
1517         err = gss_parse_init_downcall(mech, &obj, &ctx, &gmd, &gss_err);
1518         if (err)
1519                 CERROR("parse init downcall err %d\n", err);
1520
1521         vcred.vc_uid = gmd.gum_uid;
1522         vcred.vc_pag = vcred.vc_uid; /* FIXME */
1523
1524         cred = ptlrpcs_cred_lookup(sec, &vcred);
1525         if (!cred) {
1526                 CWARN("didn't find cred for uid %u\n", vcred.vc_uid);
1527                 GOTO(err, err = -EINVAL);
1528         }
1529
1530         if (err || gss_err) {
1531                 cred->pc_flags |= PTLRPC_CRED_DEAD;
1532                 if (err != -ERESTART || gss_err != 0)
1533                         cred->pc_flags |= PTLRPC_CRED_ERROR;
1534                 CERROR("cred %p: rpc err %d, gss err 0x%x, fatal %d\n",
1535                         cred, err, gss_err,
1536                         ((cred->pc_flags & PTLRPC_CRED_ERROR) != 0));
1537         } else {
1538                 CDEBUG(D_SEC, "get initial ctx:\n");
1539                 gss_cred_set_ctx(cred, ctx);
1540         }
1541
1542         spin_lock(&gsec->gs_lock);
1543         gss_msg = gss_find_upcall(gsec, obdname, &gmd);
1544         if (gss_msg) {
1545                 gss_unhash_msg_nolock(gss_msg);
1546                 spin_unlock(&gsec->gs_lock);
1547                 gss_release_msg(gss_msg);
1548         } else
1549                 spin_unlock(&gsec->gs_lock);
1550
1551         ptlrpcs_cred_put(cred, 1);
1552         class_import_put(import);
1553         OBD_FREE(buf, bufsize);
1554         RETURN(mlen);
1555 err:
1556         if (ctx)
1557                 gss_destroy_ctx(ctx);
1558         class_import_put(import);
1559 err_free:
1560         OBD_FREE(buf, bufsize);
1561         CDEBUG(D_SEC, "gss_pipe_downcall returning %d\n", err);
1562         RETURN(err);
1563 }
1564
1565 static
1566 void gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
1567 {
1568         struct gss_upcall_msg *gmsg;
1569         static unsigned long ratelimit;
1570         ENTRY;
1571
1572         if (msg->errno >= 0) {
1573                 EXIT;
1574                 return;
1575         }
1576
1577         gmsg = container_of(msg, struct gss_upcall_msg, gum_base);
1578         CDEBUG(D_SEC, "destroy gmsg %p\n", gmsg);
1579         atomic_inc(&gmsg->gum_refcount);
1580         gss_unhash_msg(gmsg);
1581         if (msg->errno == -ETIMEDOUT || msg->errno == -EPIPE) {
1582                 unsigned long now = get_seconds();
1583                 if (time_after(now, ratelimit)) {
1584                         CWARN("GSS_SEC upcall timed out.\n"
1585                               "Please check user daemon is running!\n");
1586                         ratelimit = now + 15;
1587                 }
1588         }
1589         gss_release_msg(gmsg);
1590         EXIT;
1591 }
1592
1593 static
1594 void gss_pipe_release(struct inode *inode)
1595 {
1596         struct rpc_inode *rpci = RPC_I(inode);
1597         struct ptlrpc_sec *sec;
1598         struct gss_sec *gsec;
1599         ENTRY;
1600
1601         gsec = (struct gss_sec *)rpci->private;
1602         sec = &gsec->gs_base;
1603         spin_lock(&gsec->gs_lock);
1604         while (!list_empty(&gsec->gs_upcalls)) {
1605                 struct gss_upcall_msg *gmsg;
1606
1607                 gmsg = list_entry(gsec->gs_upcalls.next,
1608                                   struct gss_upcall_msg, gum_list);
1609                 gmsg->gum_base.errno = -EPIPE;
1610                 atomic_inc(&gmsg->gum_refcount);
1611                 gss_unhash_msg_nolock(gmsg);
1612                 gss_release_msg(gmsg);
1613         }
1614         spin_unlock(&gsec->gs_lock);
1615         EXIT;
1616 }
1617
1618 static struct rpc_pipe_ops gss_upcall_ops = {
1619         .upcall         = gss_pipe_upcall,
1620         .downcall       = gss_pipe_downcall,
1621         .destroy_msg    = gss_pipe_destroy_msg,
1622         .release_pipe   = gss_pipe_release,
1623 };
1624 #endif /* __KERNEL__ */
1625
1626 /*********************************************
1627  * GSS security APIs                         *
1628  *********************************************/
1629
1630 static
1631 struct ptlrpc_sec* gss_create_sec(ptlrpcs_flavor_t *flavor,
1632                                   const char *pipe_dir,
1633                                   void *pipe_data)
1634 {
1635         struct gss_sec *gsec;
1636         struct ptlrpc_sec *sec;
1637 #ifdef __KERNEL__
1638         char *pos;
1639         int   pipepath_len;
1640 #endif
1641         ENTRY;
1642
1643         LASSERT(flavor->flavor == PTLRPC_SEC_GSS);
1644
1645         OBD_ALLOC(gsec, sizeof(*gsec));
1646         if (!gsec) {
1647                 CERROR("can't alloc gsec\n");
1648                 RETURN(NULL);
1649         }
1650
1651         gsec->gs_mech = kgss_subflavor_to_mech(flavor->subflavor);
1652         if (!gsec->gs_mech) {
1653                 CERROR("subflavor %d not found\n", flavor->subflavor);
1654                 goto err_free;
1655         }
1656
1657         /* initialize gss sec */
1658 #ifdef __KERNEL__
1659         INIT_LIST_HEAD(&gsec->gs_upcalls);
1660         spin_lock_init(&gsec->gs_lock);
1661
1662         pipepath_len = strlen(LUSTRE_PIPEDIR) + strlen(pipe_dir) +
1663                        strlen(gsec->gs_mech->gm_name) + 3;
1664         OBD_ALLOC(gsec->gs_pipepath, pipepath_len);
1665         if (!gsec->gs_pipepath)
1666                 goto err_mech_put;
1667
1668         sprintf(gsec->gs_pipepath, LUSTRE_PIPEDIR"/%s", pipe_dir);
1669         if (IS_ERR(rpc_mkdir(gsec->gs_pipepath, NULL))) {
1670                 CERROR("can't make pipedir %s\n", gsec->gs_pipepath);
1671                 goto err_free_path;
1672         }
1673
1674         sprintf(gsec->gs_pipepath, LUSTRE_PIPEDIR"/%s/%s", pipe_dir,
1675                 gsec->gs_mech->gm_name);
1676         gsec->gs_depipe = rpc_mkpipe(gsec->gs_pipepath, gsec,
1677                                      &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
1678         if (IS_ERR(gsec->gs_depipe)) {
1679                 CERROR("failed to make rpc_pipe %s: %ld\n",
1680                         gsec->gs_pipepath, PTR_ERR(gsec->gs_depipe));
1681                 goto err_rmdir;
1682         }
1683         CDEBUG(D_SEC, "gss sec %p, pipe path %s\n", gsec, gsec->gs_pipepath);
1684 #endif
1685
1686         sec = &gsec->gs_base;
1687
1688         switch (flavor->subflavor) {
1689         case PTLRPC_SEC_GSS_KRB5I:
1690                 sec->ps_sectype = PTLRPC_SEC_TYPE_AUTH;
1691                 break;
1692         case PTLRPC_SEC_GSS_KRB5P:
1693                 sec->ps_sectype = PTLRPC_SEC_TYPE_PRIV;
1694                 break;
1695         default:
1696                 LBUG();
1697         }
1698
1699         sec->ps_expire = GSS_CREDCACHE_EXPIRE;
1700         sec->ps_nextgc = get_seconds() + sec->ps_expire;
1701         sec->ps_flags = 0;
1702
1703         CDEBUG(D_SEC, "Create GSS security instance at %p(external %p)\n",
1704                gsec, sec);
1705         RETURN(sec);
1706
1707 #ifdef __KERNEL__
1708 err_rmdir:
1709         pos = strrchr(gsec->gs_pipepath, '/');
1710         LASSERT(pos);
1711         *pos = 0;
1712         rpc_rmdir(gsec->gs_pipepath);
1713 err_free_path:
1714         OBD_FREE(gsec->gs_pipepath, pipepath_len);
1715 err_mech_put:
1716 #endif
1717         kgss_mech_put(gsec->gs_mech);
1718 err_free:
1719         OBD_FREE(gsec, sizeof(*gsec));
1720         RETURN(NULL);
1721 }
1722
1723 static
1724 void gss_destroy_sec(struct ptlrpc_sec *sec)
1725 {
1726         struct gss_sec *gsec;
1727 #ifdef __KERNEL__
1728         char *pos;
1729         int   pipepath_len;
1730 #endif
1731         ENTRY;
1732
1733         gsec = container_of(sec, struct gss_sec, gs_base);
1734         CDEBUG(D_SEC, "Destroy GSS security instance at %p\n", gsec);
1735
1736         LASSERT(gsec->gs_mech);
1737         LASSERT(!atomic_read(&sec->ps_refcount));
1738         LASSERT(!atomic_read(&sec->ps_credcount));
1739 #ifdef __KERNEL__
1740         pipepath_len = strlen(gsec->gs_pipepath) + 1;
1741         rpc_unlink(gsec->gs_pipepath);
1742         pos = strrchr(gsec->gs_pipepath, '/');
1743         LASSERT(pos);
1744         *pos = 0;
1745         rpc_rmdir(gsec->gs_pipepath);
1746         OBD_FREE(gsec->gs_pipepath, pipepath_len);
1747 #endif
1748
1749         kgss_mech_put(gsec->gs_mech);
1750         OBD_FREE(gsec, sizeof(*gsec));
1751         EXIT;
1752 }
1753
1754 static
1755 struct ptlrpc_cred * gss_create_cred(struct ptlrpc_sec *sec,
1756                                      struct vfs_cred *vcred)
1757 {
1758         struct gss_cred *gcred;
1759         struct ptlrpc_cred *cred;
1760         ENTRY;
1761
1762         OBD_ALLOC(gcred, sizeof(*gcred));
1763         if (!gcred)
1764                 RETURN(NULL);
1765
1766         cred = &gcred->gc_base;
1767         INIT_LIST_HEAD(&cred->pc_hash);
1768         atomic_set(&cred->pc_refcount, 0);
1769         cred->pc_sec = sec;
1770         cred->pc_ops = &gss_credops;
1771         cred->pc_expire = get_seconds() + GSS_CRED_EXPIRE;
1772         cred->pc_flags = 0;
1773         cred->pc_pag = vcred->vc_pag;
1774         cred->pc_uid = vcred->vc_uid;
1775         CDEBUG(D_SEC, "create a gss cred at %p("LPU64"/%u)\n",
1776                cred, vcred->vc_pag, vcred->vc_uid);
1777
1778         RETURN(cred);
1779 }
1780
1781 static int gss_estimate_payload(struct ptlrpc_sec *sec, int msgsize)
1782 {
1783         switch (sec->ps_sectype) {
1784         case PTLRPC_SEC_TYPE_AUTH:
1785                 return GSS_MAX_AUTH_PAYLOAD;
1786         case PTLRPC_SEC_TYPE_PRIV:
1787                 return size_round16(GSS_MAX_AUTH_PAYLOAD + msgsize +
1788                                     GSS_PRIVBUF_PREFIX_LEN +
1789                                     GSS_PRIVBUF_SUFFIX_LEN);
1790         default:
1791                 LBUG();
1792                 return 0;
1793         }
1794 }
1795
1796 static int gss_alloc_reqbuf(struct ptlrpc_sec *sec,
1797                             struct ptlrpc_request *req,
1798                             int lmsg_size)
1799 {
1800         int msg_payload, sec_payload;
1801         int privacy, rc;
1802         ENTRY;
1803
1804         /* In PRIVACY mode, lustre message is always 0 (already encoded into
1805          * security payload).
1806          */
1807         privacy = sec->ps_sectype == PTLRPC_SEC_TYPE_PRIV;
1808         msg_payload = privacy ? 0 : lmsg_size;
1809         sec_payload = gss_estimate_payload(sec, lmsg_size);
1810
1811         rc = sec_alloc_reqbuf(sec, req, msg_payload, sec_payload);
1812         if (rc)
1813                 return rc;
1814
1815         if (privacy) {
1816                 int buflen = lmsg_size + GSS_PRIVBUF_PREFIX_LEN +
1817                              GSS_PRIVBUF_SUFFIX_LEN;
1818                 char *buf;
1819
1820                 OBD_ALLOC(buf, buflen);
1821                 if (!buf) {
1822                         CERROR("Fail to alloc %d\n", buflen);
1823                         sec_free_reqbuf(sec, req);
1824                         RETURN(-ENOMEM);
1825                 }
1826                 req->rq_reqmsg = (struct lustre_msg *)
1827                                         (buf + GSS_PRIVBUF_PREFIX_LEN);
1828         }
1829
1830         RETURN(0);
1831 }
1832
1833 static void gss_free_reqbuf(struct ptlrpc_sec *sec,
1834                             struct ptlrpc_request *req)
1835 {
1836         char *buf;
1837         int privacy;
1838         ENTRY;
1839
1840         LASSERT(req->rq_reqmsg);
1841         LASSERT(req->rq_reqlen);
1842
1843         privacy = sec->ps_sectype == PTLRPC_SEC_TYPE_PRIV;
1844         if (privacy) {
1845                 buf = (char *) req->rq_reqmsg - GSS_PRIVBUF_PREFIX_LEN;
1846                 LASSERT(buf < req->rq_reqbuf ||
1847                         buf >= req->rq_reqbuf + req->rq_reqbuf_len);
1848                 OBD_FREE(buf, req->rq_reqlen + GSS_PRIVBUF_PREFIX_LEN +
1849                               GSS_PRIVBUF_SUFFIX_LEN);
1850                 req->rq_reqmsg = NULL;
1851         }
1852
1853         sec_free_reqbuf(sec, req);
1854 }
1855
1856 static struct ptlrpc_secops gss_secops = {
1857         .create_sec             = gss_create_sec,
1858         .destroy_sec            = gss_destroy_sec,
1859         .create_cred            = gss_create_cred,
1860         .est_req_payload        = gss_estimate_payload,
1861         .est_rep_payload        = gss_estimate_payload,
1862         .alloc_reqbuf           = gss_alloc_reqbuf,
1863         .free_reqbuf            = gss_free_reqbuf,
1864 };
1865
1866 static struct ptlrpc_sec_type gss_type = {
1867         .pst_owner      = THIS_MODULE,
1868         .pst_name       = "GSS_SEC",
1869         .pst_inst       = ATOMIC_INIT(0),
1870         .pst_flavor     = {PTLRPC_SEC_GSS, 0},
1871         .pst_ops        = &gss_secops,
1872 };
1873
1874 extern int
1875 (*lustre_secinit_downcall_handler)(char *buffer, unsigned long count);
1876
1877 int __init ptlrpcs_gss_init(void)
1878 {
1879         int rc;
1880
1881         rc = ptlrpcs_register(&gss_type);
1882         if (rc)
1883                 return rc;
1884
1885 #ifdef __KERNEL__
1886         gss_svc_init();
1887
1888         rc = PTR_ERR(rpc_mkdir(LUSTRE_PIPEDIR, NULL));
1889         if (IS_ERR((void *)rc) && rc != -EEXIST) {
1890                 CERROR("fail to make rpcpipedir for lustre\n");
1891                 gss_svc_exit();
1892                 ptlrpcs_unregister(&gss_type);
1893                 return -1;
1894         }
1895         rc = 0;
1896 #else
1897 #endif
1898         rc = init_kerberos_module();
1899         if (rc) {
1900                 ptlrpcs_unregister(&gss_type);
1901         }
1902
1903         lustre_secinit_downcall_handler = gss_send_secinit_rpc;
1904
1905         return rc;
1906 }
1907
1908 #ifdef __KERNEL__
1909 static void __exit ptlrpcs_gss_exit(void)
1910 {
1911         lustre_secinit_downcall_handler = NULL;
1912
1913         cleanup_kerberos_module();
1914         rpc_rmdir(LUSTRE_PIPEDIR);
1915         gss_svc_exit();
1916         ptlrpcs_unregister(&gss_type);
1917 }
1918 #endif
1919
1920 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1921 MODULE_DESCRIPTION("GSS Security module for Lustre");
1922 MODULE_LICENSE("GPL");
1923
1924 module_init(ptlrpcs_gss_init);
1925 module_exit(ptlrpcs_gss_exit);