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 #ifndef EXPORT_SYMTAB
  41 #define EXPORT_SYMTAB
  42 #endif
  43 #define DEBUG_SUBSYSTEM S_MDS
  44
  45 #ifndef AUTOCONF_INCLUDED
  46 #include <linux/config.h>
  47 #endif
  48 #include <linux/module.h>
  49 #include <linux/kernel.h>
  50 #include <linux/mm.h>
  51 #include <linux/kmod.h>
  52 #include <linux/string.h>
  53 #include <linux/stat.h>
  54 #include <linux/errno.h>
  55 #include <linux/version.h>
  56 #include <linux/unistd.h>
  57 #include <asm/system.h>
  58 #include <asm/uaccess.h>
  59 #include <linux/fs.h>
  60 #include <linux/stat.h>
  61 #include <asm/uaccess.h>
  62 #include <linux/slab.h>
  63
  64 #include <libcfs/libcfs.h>
  65 #include <libcfs/lucache.h>
  66 #include <obd.h>
  67 #include <obd_class.h>
  68 #include <obd_support.h>
  69 #include <lustre_net.h>
  70 #include <lustre_import.h>
  71 #include <lustre_dlm.h>
  72 #include <lustre_sec.h>
  73 #include <lustre_lib.h>
  74
  75 #include "mdt_internal.h"
  76
  77 #define mdt_init_sec_none(reply, exp)                                   \
  78 do {                                                                    \
  79         reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |          \
  80                                       OBD_CONNECT_RMT_CLIENT_FORCE |    \
  81                                       OBD_CONNECT_MDS_CAPA |            \
  82                                       OBD_CONNECT_OSS_CAPA);            \
  83         cfs_spin_lock(&exp->exp_lock);                                  \
  84         exp->exp_connect_flags = reply->ocd_connect_flags;              \
  85         cfs_spin_unlock(&exp->exp_lock);                                \
  86 } while (0)
  87
  88 int mdt_init_sec_level(struct mdt_thread_info *info)
  89 {
  90         struct mdt_device *mdt = info->mti_mdt;
  91         struct ptlrpc_request *req = mdt_info_req(info);
  92         char *client = libcfs_nid2str(req->rq_peer.nid);
  93         struct obd_export *exp = req->rq_export;
  94         struct obd_device *obd = exp->exp_obd;
  95         struct obd_connect_data *data, *reply;
  96         int rc = 0, remote;
  97         ENTRY;
  98
  99         data = req_capsule_client_get(info->mti_pill, &RMF_CONNECT_DATA);
 100         reply = req_capsule_server_get(info->mti_pill, &RMF_CONNECT_DATA);
 101         if (data == NULL || reply == NULL)
 102                 RETURN(-EFAULT);
 103
 104         /* connection from MDT is always trusted */
 105         if (req->rq_auth_usr_mdt) {
 106                 mdt_init_sec_none(reply, exp);
 107                 RETURN(0);
 108         }
 109
 110         /* no GSS support case */
 111         if (!req->rq_auth_gss) {
 112                 if (mdt->mdt_sec_level > LUSTRE_SEC_NONE) {
 113                         CWARN("client %s -> target %s does not user GSS, "
 114                               "can not run under security level %d.\n",
 115                               client, obd->obd_name, mdt->mdt_sec_level);
 116                         RETURN(-EACCES);
 117                 } else {
 118                         mdt_init_sec_none(reply, exp);
 119                         RETURN(0);
 120                 }
 121         }
 122
 123         /* old version case */
 124         if (unlikely(!(data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT) ||
 125                      !(data->ocd_connect_flags & OBD_CONNECT_MDS_CAPA) ||
 126                      !(data->ocd_connect_flags & OBD_CONNECT_OSS_CAPA))) {
 127                 if (mdt->mdt_sec_level > LUSTRE_SEC_NONE) {
 128                         CWARN("client %s -> target %s uses old version, "
 129                               "can not run under security level %d.\n",
 130                               client, obd->obd_name, mdt->mdt_sec_level);
 131                         RETURN(-EACCES);
 132                 } else {
 133                         CWARN("client %s -> target %s uses old version, "
 134                               "run under security level %d.\n",
 135                               client, obd->obd_name, mdt->mdt_sec_level);
 136                         mdt_init_sec_none(reply, exp);
 137                         RETURN(0);
 138                 }
 139         }
 140
 141         remote = data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT_FORCE;
 142         if (remote) {
 143                 if (!req->rq_auth_remote)
 144                         CDEBUG(D_SEC, "client (local realm) %s -> target %s "
 145                                "asked to be remote.\n", client, obd->obd_name);
 146         } else if (req->rq_auth_remote) {
 147                 remote = 1;
 148                 CDEBUG(D_SEC, "client (remote realm) %s -> target %s is set "
 149                        "as remote by default.\n", client, obd->obd_name);
 150         }
 151
 152         if (remote) {
 153                 if (!mdt->mdt_opts.mo_oss_capa) {
 154                         CDEBUG(D_SEC, "client %s -> target %s is set as remote,"
 155                                " but OSS capabilities are not enabled: %d.\n",
 156                                client, obd->obd_name, mdt->mdt_opts.mo_oss_capa);
 157                         RETURN(-EACCES);
 158                 }
 159         } else {
 160                 if (req->rq_auth_uid == INVALID_UID) {
 161                         CDEBUG(D_SEC, "client %s -> target %s: user is not "
 162                                "authenticated!\n", client, obd->obd_name);
 163                         RETURN(-EACCES);
 164                 }
 165         }
 166
 167         switch (mdt->mdt_sec_level) {
 168         case LUSTRE_SEC_NONE:
 169                 if (!remote) {
 170                         mdt_init_sec_none(reply, exp);
 171                         break;
 172                 } else {
 173                         CDEBUG(D_SEC, "client %s -> target %s is set as remote, "
 174                                "can not run under security level %d.\n",
 175                                client, obd->obd_name, mdt->mdt_sec_level);
 176                         RETURN(-EACCES);
 177                 }
 178         case LUSTRE_SEC_REMOTE:
 179                 if (!remote)
 180                         mdt_init_sec_none(reply, exp);
 181                 break;
 182         case LUSTRE_SEC_ALL:
 183                 if (!remote) {
 184                         reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |
 185                                                       OBD_CONNECT_RMT_CLIENT_FORCE);
 186                         if (!mdt->mdt_opts.mo_mds_capa)
 187                                 reply->ocd_connect_flags &= ~OBD_CONNECT_MDS_CAPA;
 188                         if (!mdt->mdt_opts.mo_oss_capa)
 189                                 reply->ocd_connect_flags &= ~OBD_CONNECT_OSS_CAPA;
 190
 191                         cfs_spin_lock(&exp->exp_lock);
 192                         exp->exp_connect_flags = reply->ocd_connect_flags;
 193                         cfs_spin_unlock(&exp->exp_lock);
 194                 }
 195                 break;
 196         default:
 197                 RETURN(-EINVAL);
 198         }
 199
 200         RETURN(rc);
 201 }
 202
 203 int mdt_init_idmap(struct mdt_thread_info *info)
 204 {
 205         struct ptlrpc_request *req = mdt_info_req(info);
 206         struct mdt_export_data *med = mdt_req2med(req);
 207         struct obd_export *exp = req->rq_export;
 208         char *client = libcfs_nid2str(req->rq_peer.nid);
 209         struct obd_device *obd = exp->exp_obd;
 210         int rc = 0;
 211         ENTRY;
 212
 213         if (exp_connect_rmtclient(exp)) {
 214                 cfs_mutex_lock(&med->med_idmap_mutex);
 215                 if (!med->med_idmap)
 216                         med->med_idmap = lustre_idmap_init();
 217                 cfs_mutex_unlock(&med->med_idmap_mutex);
 218
 219                 if (IS_ERR(med->med_idmap)) {
 220                         long err = PTR_ERR(med->med_idmap);
 221
 222                         med->med_idmap = NULL;
 223                         CERROR("client %s -> target %s "
 224                                "failed to init idmap [%ld]!\n",
 225                                client, obd->obd_name, err);
 226                         RETURN(err);
 227                 } else if (!med->med_idmap) {
 228                         CERROR("client %s -> target %s "
 229                                "failed to init(2) idmap!\n",
 230                                client, obd->obd_name);
 231                         RETURN(-ENOMEM);
 232                 }
 233
 234                 CDEBUG(D_SEC, "client %s -> target %s is remote.\n",
 235                        client, obd->obd_name);
 236                 /* NB, MDS_CONNECT establish root idmap too! */
 237                 rc = mdt_handle_idmap(info);
 238         }
 239         RETURN(rc);
 240 }
 241
 242 void mdt_cleanup_idmap(struct mdt_export_data *med)
 243 {
 244         cfs_mutex_lock(&med->med_idmap_mutex);
 245         if (med->med_idmap != NULL) {
 246                 lustre_idmap_fini(med->med_idmap);
 247                 med->med_idmap = NULL;
 248         }
 249         cfs_mutex_unlock(&med->med_idmap_mutex);
 250 }
 251
 252 static inline void mdt_revoke_export_locks(struct obd_export *exp)
 253 {
 254         /* don't revoke locks during recovery */
 255         if (exp->exp_obd->obd_recovering)
 256                 return;
 257
 258         ldlm_revoke_export_locks(exp);
 259 }
 260
 261 int mdt_handle_idmap(struct mdt_thread_info *info)
 262 {
 263         struct ptlrpc_request *req = mdt_info_req(info);
 264         struct mdt_device *mdt = info->mti_mdt;
 265         struct mdt_export_data *med;
 266         struct ptlrpc_user_desc *pud = req->rq_user_desc;
 267         struct md_identity *identity;
 268         __u32 opc;
 269         int rc = 0;
 270         ENTRY;
 271
 272         if (!req->rq_export)
 273                 RETURN(0);
 274
 275         med = mdt_req2med(req);
 276         if (!exp_connect_rmtclient(info->mti_exp))
 277                 RETURN(0);
 278
 279         opc = lustre_msg_get_opc(req->rq_reqmsg);
 280         /* Bypass other opc */
 281         if ((opc != SEC_CTX_INIT) && (opc != SEC_CTX_INIT_CONT) &&
 282             (opc != SEC_CTX_FINI) && (opc != MDS_CONNECT))
 283                 RETURN(0);
 284
 285         LASSERT(med->med_idmap);
 286
 287         if (unlikely(!pud)) {
 288                 CDEBUG(D_SEC, "remote client must run with rq_user_desc "
 289                        "present\n");
 290                 RETURN(-EACCES);
 291         }
 292
 293         if (req->rq_auth_mapped_uid == INVALID_UID) {
 294                 CDEBUG(D_SEC, "invalid authorized mapped uid, please check "
 295                        "/etc/lustre/idmap.conf!\n");
 296                 RETURN(-EACCES);
 297         }
 298
 299         if (is_identity_get_disabled(mdt->mdt_identity_cache)) {
 300                 CDEBUG(D_SEC, "remote client must run with identity_get "
 301                        "enabled!\n");
 302                 RETURN(-EACCES);
 303         }
 304
 305         identity = mdt_identity_get(mdt->mdt_identity_cache,
 306                                     req->rq_auth_mapped_uid);
 307         if (IS_ERR(identity)) {
 308                 CDEBUG(D_SEC, "can't get mdt identity(%u), no mapping added\n",
 309                        req->rq_auth_mapped_uid);
 310                 RETURN(-EACCES);
 311         }
 312
 313         switch (opc) {
 314                 case SEC_CTX_INIT:
 315                 case SEC_CTX_INIT_CONT:
 316                 case MDS_CONNECT:
 317                         rc = lustre_idmap_add(med->med_idmap,
 318                                               pud->pud_uid, identity->mi_uid,
 319                                               pud->pud_gid, identity->mi_gid);
 320                         break;
 321                 case SEC_CTX_FINI:
 322                         rc = lustre_idmap_del(med->med_idmap,
 323                                               pud->pud_uid, identity->mi_uid,
 324                                               pud->pud_gid, identity->mi_gid);
 325                         break;
 326         }
 327
 328         mdt_identity_put(mdt->mdt_identity_cache, identity);
 329
 330         if (rc)
 331                 RETURN(rc);
 332
 333         switch (opc) {
 334                 case SEC_CTX_INIT:
 335                 case SEC_CTX_INIT_CONT:
 336                 case SEC_CTX_FINI:
 337                         mdt_revoke_export_locks(req->rq_export);
 338                         break;
 339         }
 340
 341         RETURN(0);
 342 }
 343
 344 int ptlrpc_user_desc_do_idmap(struct ptlrpc_request *req,
 345                               struct ptlrpc_user_desc *pud)
 346 {
 347         struct mdt_export_data    *med = mdt_req2med(req);
 348         struct lustre_idmap_table *idmap = med->med_idmap;
 349         uid_t uid, fsuid;
 350         gid_t gid, fsgid;
 351
 352         /* Only remote client need desc_to_idmap. */
 353         if (!exp_connect_rmtclient(req->rq_export))
 354                 return 0;
 355
 356         uid = lustre_idmap_lookup_uid(NULL, idmap, 0, pud->pud_uid);
 357         if (uid == CFS_IDMAP_NOTFOUND) {
 358                 CDEBUG(D_SEC, "no mapping for uid %u\n", pud->pud_uid);
 359                 return -EACCES;
 360         }
 361
 362         if (pud->pud_uid == pud->pud_fsuid) {
 363                 fsuid = uid;
 364         } else {
 365                 fsuid = lustre_idmap_lookup_uid(NULL, idmap, 0, pud->pud_fsuid);
 366                 if (fsuid == CFS_IDMAP_NOTFOUND) {
 367                         CDEBUG(D_SEC, "no mapping for fsuid %u\n",
 368                                pud->pud_fsuid);
 369                         return -EACCES;
 370                 }
 371         }
 372
 373         gid = lustre_idmap_lookup_gid(NULL, idmap, 0, pud->pud_gid);
 374         if (gid == CFS_IDMAP_NOTFOUND) {
 375                 CDEBUG(D_SEC, "no mapping for gid %u\n", pud->pud_gid);
 376                 return -EACCES;
 377         }
 378
 379         if (pud->pud_gid == pud->pud_fsgid) {
 380                 fsgid = gid;
 381         } else {
 382                 fsgid = lustre_idmap_lookup_gid(NULL, idmap, 0, pud->pud_fsgid);
 383                 if (fsgid == CFS_IDMAP_NOTFOUND) {
 384                         CDEBUG(D_SEC, "no mapping for fsgid %u\n",
 385                                pud->pud_fsgid);
 386                         return -EACCES;
 387                 }
 388         }
 389
 390         pud->pud_uid = uid;
 391         pud->pud_gid = gid;
 392         pud->pud_fsuid = fsuid;
 393         pud->pud_fsgid = fsgid;
 394
 395         return 0;
 396 }
 397
 398 /*
 399  * Reverse mapping
 400  */
 401 void mdt_body_reverse_idmap(struct mdt_thread_info *info, struct mdt_body *body)
 402 {
 403         struct ptlrpc_request     *req = mdt_info_req(info);
 404         struct md_ucred           *uc = mdt_ucred(info);
 405         struct mdt_export_data    *med = mdt_req2med(req);
 406         struct lustre_idmap_table *idmap = med->med_idmap;
 407
 408         if (!exp_connect_rmtclient(info->mti_exp))
 409                 return;
 410
 411         if (body->valid & OBD_MD_FLUID) {
 412                 uid_t uid = lustre_idmap_lookup_uid(uc, idmap, 1, body->uid);
 413
 414                 if (uid == CFS_IDMAP_NOTFOUND) {
 415                         uid = NOBODY_UID;
 416                         if (body->valid & OBD_MD_FLMODE)
 417                                 body->mode = (body->mode & ~S_IRWXU) |
 418                                              ((body->mode & S_IRWXO) << 6);
 419                 }
 420
 421                 body->uid = uid;
 422         }
 423
 424         if (body->valid & OBD_MD_FLGID) {
 425                 gid_t gid = lustre_idmap_lookup_gid(uc, idmap, 1, body->gid);
 426
 427                 if (gid == CFS_IDMAP_NOTFOUND) {
 428                         gid = NOBODY_GID;
 429                         if (body->valid & OBD_MD_FLMODE)
 430                                 body->mode = (body->mode & ~S_IRWXG) |
 431                                              ((body->mode & S_IRWXO) << 3);
 432                 }
 433
 434                 body->gid = gid;
 435         }
 436 }
 437
 438 /* Do not ignore root_squash for non-setattr case. */
 439 int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
 440 {
 441         struct ptlrpc_request     *req = mdt_info_req(info);
 442         struct md_ucred           *uc = mdt_ucred(info);
 443         struct lu_attr            *attr = &info->mti_attr.ma_attr;
 444         struct mdt_export_data    *med = mdt_req2med(req);
 445         struct lustre_idmap_table *idmap = med->med_idmap;
 446
 447         if ((uc->mu_valid != UCRED_OLD) && (uc->mu_valid != UCRED_NEW))
 448                 return -EINVAL;
 449
 450         if (op != REINT_SETATTR) {
 451                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
 452                         attr->la_uid = uc->mu_fsuid;
 453                 /* for S_ISGID, inherit gid from his parent, such work will be
 454                  * done in cmm/mdd layer, here set all cases as uc->mu_fsgid. */
 455                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
 456                         attr->la_gid = uc->mu_fsgid;
 457         } else if (exp_connect_rmtclient(info->mti_exp)) {
 458                 /* NB: -1 case will be handled by mdt_fix_attr() later. */
 459                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1)) {
 460                         uid_t uid = lustre_idmap_lookup_uid(uc, idmap, 0,
 461                                                             attr->la_uid);
 462
 463                         if (uid == CFS_IDMAP_NOTFOUND) {
 464                                 CDEBUG(D_SEC, "Deny chown to uid %u\n",
 465                                        attr->la_uid);
 466                                 return -EPERM;
 467                         }
 468
 469                         attr->la_uid = uid;
 470                 }
 471                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1)) {
 472                         gid_t gid = lustre_idmap_lookup_gid(uc, idmap, 0,
 473                                                             attr->la_gid);
 474
 475                         if (gid == CFS_IDMAP_NOTFOUND) {
 476                                 CDEBUG(D_SEC, "Deny chown to gid %u\n",
 477                                        attr->la_gid);
 478                                 return -EPERM;
 479                         }
 480
 481                         attr->la_gid = gid;
 482                 }
 483         }
 484
 485         return 0;
 486 }