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