lustre/mdt/mdt_idmap.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/mdt/mdt_idmap.c
  37  *
  38  * Author: Lai Siyao <lsy@clusterfs.com>
  39  * Author: Fan Yong <fanyong@clusterfs.com>
  40  */
  41
  42 #define DEBUG_SUBSYSTEM S_MDS
  43
  44 #include <linux/module.h>
  45 #include <linux/kernel.h>
  46 #include <linux/mm.h>
  47 #include <linux/kmod.h>
  48 #include <linux/string.h>
  49 #include <linux/stat.h>
  50 #include <linux/errno.h>
  51 #include <linux/version.h>
  52 #include <linux/unistd.h>
  53 #include <asm/uaccess.h>
  54 #include <linux/fs.h>
  55 #include <linux/stat.h>
  56 #include <asm/uaccess.h>
  57 #include <linux/slab.h>
  58
  59 #include <libcfs/libcfs.h>
  60 #include <libcfs/lucache.h>
  61 #include <obd.h>
  62 #include <obd_class.h>
  63 #include <obd_support.h>
  64 #include <lustre_net.h>
  65 #include <lustre_import.h>
  66 #include <lustre_dlm.h>
  67 #include <lustre_sec.h>
  68 #include <lustre_lib.h>
  69
  70 #include "mdt_internal.h"
  71
  72 #define mdt_init_sec_none(reply, exp)                                   \
  73 do {                                                                    \
  74         reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |          \
  75                                       OBD_CONNECT_RMT_CLIENT_FORCE |    \
  76                                       OBD_CONNECT_MDS_CAPA |            \
  77                                       OBD_CONNECT_OSS_CAPA);            \
  78 } while (0)
  79
  80 int mdt_init_sec_level(struct mdt_thread_info *info)
  81 {
  82         struct mdt_device *mdt = info->mti_mdt;
  83         struct ptlrpc_request *req = mdt_info_req(info);
  84         char *client = libcfs_nid2str(req->rq_peer.nid);
  85         struct obd_export *exp = req->rq_export;
  86         struct obd_device *obd = exp->exp_obd;
  87         struct obd_connect_data *data, *reply;
  88         int rc = 0, remote;
  89         ENTRY;
  90
  91         data = req_capsule_client_get(info->mti_pill, &RMF_CONNECT_DATA);
  92         reply = req_capsule_server_get(info->mti_pill, &RMF_CONNECT_DATA);
  93         if (data == NULL || reply == NULL)
  94                 RETURN(-EFAULT);
  95
  96         /* connection from MDT is always trusted */
  97         if (req->rq_auth_usr_mdt) {
  98                 mdt_init_sec_none(reply, exp);
  99                 RETURN(0);
 100         }
 101
 102         /* no GSS support case */
 103         if (!req->rq_auth_gss) {
 104                 if (mdt->mdt_sec_level > LUSTRE_SEC_NONE) {
 105                         CWARN("client %s -> target %s does not user GSS, "
 106                               "can not run under security level %d.\n",
 107                               client, obd->obd_name, mdt->mdt_sec_level);
 108                         RETURN(-EACCES);
 109                 } else {
 110                         mdt_init_sec_none(reply, exp);
 111                         RETURN(0);
 112                 }
 113         }
 114
 115         /* old version case */
 116         if (unlikely(!(data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT) ||
 117                      !(data->ocd_connect_flags & OBD_CONNECT_MDS_CAPA) ||
 118                      !(data->ocd_connect_flags & OBD_CONNECT_OSS_CAPA))) {
 119                 if (mdt->mdt_sec_level > LUSTRE_SEC_NONE) {
 120                         CWARN("client %s -> target %s uses old version, "
 121                               "can not run under security level %d.\n",
 122                               client, obd->obd_name, mdt->mdt_sec_level);
 123                         RETURN(-EACCES);
 124                 } else {
 125                         CWARN("client %s -> target %s uses old version, "
 126                               "run under security level %d.\n",
 127                               client, obd->obd_name, mdt->mdt_sec_level);
 128                         mdt_init_sec_none(reply, exp);
 129                         RETURN(0);
 130                 }
 131         }
 132
 133         remote = data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT_FORCE;
 134         if (remote) {
 135                 if (!req->rq_auth_remote)
 136                         CDEBUG(D_SEC, "client (local realm) %s -> target %s "
 137                                "asked to be remote.\n", client, obd->obd_name);
 138         } else if (req->rq_auth_remote) {
 139                 remote = 1;
 140                 CDEBUG(D_SEC, "client (remote realm) %s -> target %s is set "
 141                        "as remote by default.\n", client, obd->obd_name);
 142         }
 143
 144         if (remote) {
 145                 if (!mdt->mdt_opts.mo_oss_capa) {
 146                         CDEBUG(D_SEC, "client %s -> target %s is set as remote,"
 147                                " but OSS capabilities are not enabled: %d.\n",
 148                                client, obd->obd_name, mdt->mdt_opts.mo_oss_capa);
 149                         RETURN(-EACCES);
 150                 }
 151         } else {
 152                 if (req->rq_auth_uid == INVALID_UID) {
 153                         CDEBUG(D_SEC, "client %s -> target %s: user is not "
 154                                "authenticated!\n", client, obd->obd_name);
 155                         RETURN(-EACCES);
 156                 }
 157         }
 158
 159         switch (mdt->mdt_sec_level) {
 160         case LUSTRE_SEC_NONE:
 161                 if (!remote) {
 162                         mdt_init_sec_none(reply, exp);
 163                         break;
 164                 } else {
 165                         CDEBUG(D_SEC, "client %s -> target %s is set as remote, "
 166                                "can not run under security level %d.\n",
 167                                client, obd->obd_name, mdt->mdt_sec_level);
 168                         RETURN(-EACCES);
 169                 }
 170         case LUSTRE_SEC_REMOTE:
 171                 if (!remote)
 172                         mdt_init_sec_none(reply, exp);
 173                 break;
 174         case LUSTRE_SEC_ALL:
 175                 if (!remote) {
 176                         reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |
 177                                                       OBD_CONNECT_RMT_CLIENT_FORCE);
 178                         if (!mdt->mdt_opts.mo_mds_capa)
 179                                 reply->ocd_connect_flags &= ~OBD_CONNECT_MDS_CAPA;
 180                         if (!mdt->mdt_opts.mo_oss_capa)
 181                                 reply->ocd_connect_flags &= ~OBD_CONNECT_OSS_CAPA;
 182                 }
 183                 break;
 184         default:
 185                 RETURN(-EINVAL);
 186         }
 187
 188         RETURN(rc);
 189 }
 190
 191 int mdt_init_idmap(struct mdt_thread_info *info)
 192 {
 193         struct ptlrpc_request *req = mdt_info_req(info);
 194         struct mdt_export_data *med = mdt_req2med(req);
 195         struct obd_export *exp = req->rq_export;
 196         char *client = libcfs_nid2str(req->rq_peer.nid);
 197         struct obd_device *obd = exp->exp_obd;
 198         int rc = 0;
 199         ENTRY;
 200
 201         if (exp_connect_rmtclient(exp)) {
 202                 mutex_lock(&med->med_idmap_mutex);
 203                 if (!med->med_idmap)
 204                         med->med_idmap = lustre_idmap_init();
 205                 mutex_unlock(&med->med_idmap_mutex);
 206
 207                 if (IS_ERR(med->med_idmap)) {
 208                         long err = PTR_ERR(med->med_idmap);
 209
 210                         med->med_idmap = NULL;
 211                         CERROR("client %s -> target %s "
 212                                "failed to init idmap [%ld]!\n",
 213                                client, obd->obd_name, err);
 214                         RETURN(err);
 215                 } else if (!med->med_idmap) {
 216                         CERROR("client %s -> target %s "
 217                                "failed to init(2) idmap!\n",
 218                                client, obd->obd_name);
 219                         RETURN(-ENOMEM);
 220                 }
 221
 222                 CDEBUG(D_SEC, "client %s -> target %s is remote.\n",
 223                        client, obd->obd_name);
 224                 /* NB, MDS_CONNECT establish root idmap too! */
 225                 rc = mdt_handle_idmap(info);
 226         }
 227         RETURN(rc);
 228 }
 229
 230 void mdt_cleanup_idmap(struct mdt_export_data *med)
 231 {
 232         mutex_lock(&med->med_idmap_mutex);
 233         if (med->med_idmap != NULL) {
 234                 lustre_idmap_fini(med->med_idmap);
 235                 med->med_idmap = NULL;
 236         }
 237         mutex_unlock(&med->med_idmap_mutex);
 238 }
 239
 240 static inline void mdt_revoke_export_locks(struct obd_export *exp)
 241 {
 242         /* don't revoke locks during recovery */
 243         if (exp->exp_obd->obd_recovering)
 244                 return;
 245
 246         ldlm_revoke_export_locks(exp);
 247 }
 248
 249 int mdt_handle_idmap(struct mdt_thread_info *info)
 250 {
 251         struct ptlrpc_request *req = mdt_info_req(info);
 252         struct mdt_device *mdt = info->mti_mdt;
 253         struct mdt_export_data *med;
 254         struct ptlrpc_user_desc *pud = req->rq_user_desc;
 255         struct md_identity *identity;
 256         __u32 opc;
 257         int rc = 0;
 258         ENTRY;
 259
 260         if (!req->rq_export)
 261                 RETURN(0);
 262
 263         med = mdt_req2med(req);
 264         if (!exp_connect_rmtclient(info->mti_exp))
 265                 RETURN(0);
 266
 267         opc = lustre_msg_get_opc(req->rq_reqmsg);
 268         /* Bypass other opc */
 269         if ((opc != SEC_CTX_INIT) && (opc != SEC_CTX_INIT_CONT) &&
 270             (opc != SEC_CTX_FINI) && (opc != MDS_CONNECT))
 271                 RETURN(0);
 272
 273         LASSERT(med->med_idmap);
 274
 275         if (unlikely(!pud)) {
 276                 CDEBUG(D_SEC, "remote client must run with rq_user_desc "
 277                        "present\n");
 278                 RETURN(-EACCES);
 279         }
 280
 281         if (req->rq_auth_mapped_uid == INVALID_UID) {
 282                 CDEBUG(D_SEC, "invalid authorized mapped uid, please check "
 283                        "/etc/lustre/idmap.conf!\n");
 284                 RETURN(-EACCES);
 285         }
 286
 287         if (is_identity_get_disabled(mdt->mdt_identity_cache)) {
 288                 CDEBUG(D_SEC, "remote client must run with identity_get "
 289                        "enabled!\n");
 290                 RETURN(-EACCES);
 291         }
 292
 293         identity = mdt_identity_get(mdt->mdt_identity_cache,
 294                                     req->rq_auth_mapped_uid);
 295         if (IS_ERR(identity)) {
 296                 CDEBUG(D_SEC, "can't get mdt identity(%u), no mapping added\n",
 297                        req->rq_auth_mapped_uid);
 298                 RETURN(-EACCES);
 299         }
 300
 301         switch (opc) {
 302                 case SEC_CTX_INIT:
 303                 case SEC_CTX_INIT_CONT:
 304                 case MDS_CONNECT:
 305                         rc = lustre_idmap_add(med->med_idmap,
 306                                               pud->pud_uid, identity->mi_uid,
 307                                               pud->pud_gid, identity->mi_gid);
 308                         break;
 309                 case SEC_CTX_FINI:
 310                         rc = lustre_idmap_del(med->med_idmap,
 311                                               pud->pud_uid, identity->mi_uid,
 312                                               pud->pud_gid, identity->mi_gid);
 313                         break;
 314         }
 315
 316         mdt_identity_put(mdt->mdt_identity_cache, identity);
 317
 318         if (rc)
 319                 RETURN(rc);
 320
 321         switch (opc) {
 322                 case SEC_CTX_INIT:
 323                 case SEC_CTX_INIT_CONT:
 324                 case SEC_CTX_FINI:
 325                         mdt_revoke_export_locks(req->rq_export);
 326                         break;
 327         }
 328
 329         RETURN(0);
 330 }
 331
 332 int ptlrpc_user_desc_do_idmap(struct ptlrpc_request *req,
 333                               struct ptlrpc_user_desc *pud)
 334 {
 335         struct mdt_export_data    *med = mdt_req2med(req);
 336         struct lustre_idmap_table *idmap = med->med_idmap;
 337         uid_t uid, fsuid;
 338         gid_t gid, fsgid;
 339
 340         /* Only remote client need desc_to_idmap. */
 341         if (!exp_connect_rmtclient(req->rq_export))
 342                 return 0;
 343
 344         uid = lustre_idmap_lookup_uid(NULL, idmap, 0, pud->pud_uid);
 345         if (uid == CFS_IDMAP_NOTFOUND) {
 346                 CDEBUG(D_SEC, "no mapping for uid %u\n", pud->pud_uid);
 347                 return -EACCES;
 348         }
 349
 350         if (pud->pud_uid == pud->pud_fsuid) {
 351                 fsuid = uid;
 352         } else {
 353                 fsuid = lustre_idmap_lookup_uid(NULL, idmap, 0, pud->pud_fsuid);
 354                 if (fsuid == CFS_IDMAP_NOTFOUND) {
 355                         CDEBUG(D_SEC, "no mapping for fsuid %u\n",
 356                                pud->pud_fsuid);
 357                         return -EACCES;
 358                 }
 359         }
 360
 361         gid = lustre_idmap_lookup_gid(NULL, idmap, 0, pud->pud_gid);
 362         if (gid == CFS_IDMAP_NOTFOUND) {
 363                 CDEBUG(D_SEC, "no mapping for gid %u\n", pud->pud_gid);
 364                 return -EACCES;
 365         }
 366
 367         if (pud->pud_gid == pud->pud_fsgid) {
 368                 fsgid = gid;
 369         } else {
 370                 fsgid = lustre_idmap_lookup_gid(NULL, idmap, 0, pud->pud_fsgid);
 371                 if (fsgid == CFS_IDMAP_NOTFOUND) {
 372                         CDEBUG(D_SEC, "no mapping for fsgid %u\n",
 373                                pud->pud_fsgid);
 374                         return -EACCES;
 375                 }
 376         }
 377
 378         pud->pud_uid = uid;
 379         pud->pud_gid = gid;
 380         pud->pud_fsuid = fsuid;
 381         pud->pud_fsgid = fsgid;
 382
 383         return 0;
 384 }
 385
 386 /*
 387  * Reverse mapping
 388  */
 389 void mdt_body_reverse_idmap(struct mdt_thread_info *info, struct mdt_body *body)
 390 {
 391         struct ptlrpc_request     *req = mdt_info_req(info);
 392         struct lu_ucred           *uc = mdt_ucred(info);
 393         struct mdt_export_data    *med = mdt_req2med(req);
 394         struct lustre_idmap_table *idmap = med->med_idmap;
 395
 396         if (!exp_connect_rmtclient(info->mti_exp))
 397                 return;
 398
 399         if (body->valid & OBD_MD_FLUID) {
 400                 uid_t uid = lustre_idmap_lookup_uid(uc, idmap, 1, body->uid);
 401
 402                 if (uid == CFS_IDMAP_NOTFOUND) {
 403                         uid = NOBODY_UID;
 404                         if (body->valid & OBD_MD_FLMODE)
 405                                 body->mode = (body->mode & ~S_IRWXU) |
 406                                              ((body->mode & S_IRWXO) << 6);
 407                 }
 408
 409                 body->uid = uid;
 410         }
 411
 412         if (body->valid & OBD_MD_FLGID) {
 413                 gid_t gid = lustre_idmap_lookup_gid(uc, idmap, 1, body->gid);
 414
 415                 if (gid == CFS_IDMAP_NOTFOUND) {
 416                         gid = NOBODY_GID;
 417                         if (body->valid & OBD_MD_FLMODE)
 418                                 body->mode = (body->mode & ~S_IRWXG) |
 419                                              ((body->mode & S_IRWXO) << 3);
 420                 }
 421
 422                 body->gid = gid;
 423         }
 424 }
 425
 426 /* Do not ignore root_squash for non-setattr case. */
 427 int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
 428 {
 429         struct ptlrpc_request     *req = mdt_info_req(info);
 430         struct lu_ucred           *uc = mdt_ucred_check(info);
 431         struct lu_attr            *attr = &info->mti_attr.ma_attr;
 432         struct mdt_export_data    *med = mdt_req2med(req);
 433         struct lustre_idmap_table *idmap = med->med_idmap;
 434
 435         if (uc == NULL)
 436                 return -EINVAL;
 437
 438         if (op != REINT_SETATTR) {
 439                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
 440                         attr->la_uid = uc->uc_fsuid;
 441                 /* for S_ISGID, inherit gid from his parent, such work will be
 442                  * done in cmm/mdd layer, here set all cases as uc->uc_fsgid. */
 443                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
 444                         attr->la_gid = uc->uc_fsgid;
 445         } else if (exp_connect_rmtclient(info->mti_exp)) {
 446                 /* NB: -1 case will be handled by mdt_fix_attr() later. */
 447                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1)) {
 448                         uid_t uid = lustre_idmap_lookup_uid(uc, idmap, 0,
 449                                                             attr->la_uid);
 450
 451                         if (uid == CFS_IDMAP_NOTFOUND) {
 452                                 CDEBUG(D_SEC, "Deny chown to uid %u\n",
 453                                        attr->la_uid);
 454                                 return -EPERM;
 455                         }
 456
 457                         attr->la_uid = uid;
 458                 }
 459                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1)) {
 460                         gid_t gid = lustre_idmap_lookup_gid(uc, idmap, 0,
 461                                                             attr->la_gid);
 462
 463                         if (gid == CFS_IDMAP_NOTFOUND) {
 464                                 CDEBUG(D_SEC, "Deny chown to gid %u\n",
 465                                        attr->la_gid);
 466                                 return -EPERM;
 467                         }
 468
 469                         attr->la_gid = gid;
 470                 }
 471         }
 472
 473         return 0;
 474 }