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