lustre/mdt/mdt_idmap.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2004-2006 Cluster File Systems, Inc.
   5  *   Author: Lai Siyao <lsy@clusterfs.com>
   6  *   Author: Fan Yong <fanyong@clusterfs.com>
   7  *
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #ifndef EXPORT_SYMTAB
  26 #define EXPORT_SYMTAB
  27 #endif
  28 #define DEBUG_SUBSYSTEM S_MDS
  29
  30 #ifndef AUTOCONF_INCLUDED
  31 #include <linux/config.h>
  32 #endif
  33 #include <linux/module.h>
  34 #include <linux/kernel.h>
  35 #include <linux/mm.h>
  36 #include <linux/kmod.h>
  37 #include <linux/string.h>
  38 #include <linux/stat.h>
  39 #include <linux/errno.h>
  40 #include <linux/version.h>
  41 #include <linux/unistd.h>
  42 #include <asm/system.h>
  43 #include <asm/uaccess.h>
  44 #include <linux/fs.h>
  45 #include <linux/stat.h>
  46 #include <asm/uaccess.h>
  47 #include <linux/slab.h>
  48
  49 #include <libcfs/kp30.h>
  50 #include <obd.h>
  51 #include <obd_class.h>
  52 #include <obd_support.h>
  53 #include <lustre_net.h>
  54 #include <lustre_import.h>
  55 #include <lustre_dlm.h>
  56 #include <lustre_sec.h>
  57 #include <lustre_lib.h>
  58 #include <lustre_ucache.h>
  59
  60 #include "mdt_internal.h"
  61
  62 int mdt_init_idmap(struct mdt_thread_info *info)
  63 {
  64         struct ptlrpc_request *req = mdt_info_req(info);
  65         char *client = libcfs_nid2str(req->rq_peer.nid);
  66         struct mdt_export_data *med = mdt_req2med(req);
  67         struct obd_device *obd = req->rq_export->exp_obd;
  68         struct obd_connect_data *data, *reply;
  69         int rc = 0, remote;
  70         ENTRY;
  71
  72         data = req_capsule_client_get(info->mti_pill, &RMF_CONNECT_DATA);
  73         reply = req_capsule_server_get(info->mti_pill, &RMF_CONNECT_DATA);
  74         if (data == NULL || reply == NULL)
  75                 RETURN(-EFAULT);
  76
  77         if (!req->rq_auth_gss || req->rq_auth_usr_mdt) {
  78                 med->med_rmtclient = 0;
  79                 reply->ocd_connect_flags &= ~OBD_CONNECT_RMT_CLIENT;
  80                 RETURN(0);
  81         }
  82
  83         remote = data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT;
  84
  85         if (remote) {
  86                 med->med_rmtclient = 1;
  87                 if (!req->rq_auth_remote)
  88                         CDEBUG(D_SEC, "client (local realm) %s -> target %s "
  89                                "asked to be remote!\n", client, obd->obd_name);
  90         } else if (req->rq_auth_remote) {
  91                 med->med_rmtclient = 1;
  92                 CDEBUG(D_SEC, "client (remote realm) %s -> target %s forced "
  93                        "to be remote!\n", client, obd->obd_name);
  94         }
  95
  96         if (med->med_rmtclient) {
  97                 down(&med->med_idmap_sem);
  98                 if (!med->med_idmap)
  99                         med->med_idmap = lustre_idmap_init();
 100                 up(&med->med_idmap_sem);
 101
 102                 if (IS_ERR(med->med_idmap)) {
 103                         long err = PTR_ERR(med->med_idmap);
 104
 105                         med->med_idmap = NULL;
 106                         CERROR("client %s -> target %s "
 107                                "failed to init idmap [%ld]!\n",
 108                                client, obd->obd_name, err);
 109                         RETURN(err);
 110                 } else if (!med->med_idmap) {
 111                         CERROR("client %s -> target %s "
 112                                "failed to init(2) idmap!\n",
 113                                client, obd->obd_name);
 114                         RETURN(-ENOMEM);
 115                 }
 116
 117                 reply->ocd_connect_flags &= ~OBD_CONNECT_LCL_CLIENT;
 118                 CDEBUG(D_SEC, "client %s -> target %s is remote.\n",
 119                        client, obd->obd_name);
 120
 121                 /* NB, MDS_CONNECT establish root idmap too! */
 122                 rc = mdt_handle_idmap(info);
 123         } else {
 124                 if (req->rq_auth_uid == INVALID_UID) {
 125                         CDEBUG(D_SEC, "client %s -> target %s: user is not "
 126                                "authenticated!\n", client, obd->obd_name);
 127                         RETURN(-EACCES);
 128                 }
 129                 reply->ocd_connect_flags &= ~OBD_CONNECT_RMT_CLIENT;
 130         }
 131
 132         RETURN(rc);
 133 }
 134
 135 void mdt_cleanup_idmap(struct mdt_export_data *med)
 136 {
 137         LASSERT(med->med_rmtclient);
 138
 139         down(&med->med_idmap_sem);
 140         if (med->med_idmap != NULL) {
 141                 lustre_idmap_fini(med->med_idmap);
 142                 med->med_idmap = NULL;
 143         }
 144         up(&med->med_idmap_sem);
 145 }
 146
 147 static inline void mdt_revoke_export_locks(struct obd_export *exp)
 148 {
 149         /* don't revoke locks during recovery */
 150         if (exp->exp_obd->obd_recovering)
 151                 return;
 152
 153         ldlm_revoke_export_locks(exp);
 154 }
 155
 156 int mdt_handle_idmap(struct mdt_thread_info *info)
 157 {
 158         struct ptlrpc_request *req = mdt_info_req(info);
 159         struct mdt_device *mdt = info->mti_mdt;
 160         struct mdt_export_data *med;
 161         struct ptlrpc_user_desc *pud = req->rq_user_desc;
 162         struct md_identity *identity;
 163         __u32 opc;
 164         int rc = 0;
 165         ENTRY;
 166
 167         if (!req->rq_export)
 168                 RETURN(0);
 169
 170         med = mdt_req2med(req);
 171         if (!med->med_rmtclient)
 172                 RETURN(0);
 173
 174         opc = lustre_msg_get_opc(req->rq_reqmsg);
 175         /* Bypass other opc */
 176         if ((opc != SEC_CTX_INIT) && (opc != SEC_CTX_INIT_CONT) &&
 177             (opc != SEC_CTX_FINI) && (opc != MDS_CONNECT))
 178                 RETURN(0);
 179
 180         LASSERT(med->med_idmap);
 181
 182         if (unlikely(!pud)) {
 183                 CDEBUG(D_SEC, "remote client must run with rq_user_desc "
 184                        "present\n");
 185                 RETURN(-EACCES);
 186         }
 187
 188         if (req->rq_auth_mapped_uid == INVALID_UID) {
 189                 CDEBUG(D_SEC, "invalid authorized mapped uid, please check "
 190                        "/etc/lustre/idmap.conf!\n");
 191                 RETURN(-EACCES);
 192         }
 193
 194         if (is_identity_get_disabled(mdt->mdt_identity_cache)) {
 195                 CDEBUG(D_SEC, "remote client must run with identity_get "
 196                        "enabled!\n");
 197                 RETURN(-EACCES);
 198         }
 199
 200         identity = mdt_identity_get(mdt->mdt_identity_cache,
 201                                     req->rq_auth_mapped_uid);
 202         if (IS_ERR(identity)) {
 203                 CDEBUG(D_SEC, "can't get mdt identity(%u), no mapping added\n",
 204                        req->rq_auth_mapped_uid);
 205                 RETURN(-EACCES);
 206         }
 207
 208         switch (opc) {
 209                 case SEC_CTX_INIT:
 210                 case SEC_CTX_INIT_CONT:
 211                 case MDS_CONNECT:
 212                         rc = lustre_idmap_add(med->med_idmap,
 213                                               pud->pud_uid, identity->mi_uid,
 214                                               pud->pud_gid, identity->mi_gid);
 215                         break;
 216                 case SEC_CTX_FINI:
 217                         rc = lustre_idmap_del(med->med_idmap,
 218                                               pud->pud_uid, identity->mi_uid,
 219                                               pud->pud_gid, identity->mi_gid);
 220                         break;
 221         }
 222
 223         mdt_identity_put(mdt->mdt_identity_cache, identity);
 224
 225         if (rc)
 226                 RETURN(rc);
 227
 228         switch (opc) {
 229                 case SEC_CTX_INIT:
 230                 case SEC_CTX_INIT_CONT:
 231                 case SEC_CTX_FINI:
 232                         mdt_revoke_export_locks(req->rq_export);
 233                         break;
 234         }
 235
 236         RETURN(0);
 237 }
 238
 239 int ptlrpc_user_desc_do_idmap(struct ptlrpc_request *req,
 240                               struct ptlrpc_user_desc *pud)
 241 {
 242         struct mdt_export_data    *med = mdt_req2med(req);
 243         struct lustre_idmap_table *idmap = med->med_idmap;
 244         uid_t uid, fsuid;
 245         gid_t gid, fsgid;
 246
 247         /* Only remote client need desc_to_idmap. */
 248         if (!med->med_rmtclient)
 249                 return 0;
 250
 251         uid = lustre_idmap_lookup_uid(NULL, idmap, 0, pud->pud_uid);
 252         if (uid == CFS_IDMAP_NOTFOUND) {
 253                 CDEBUG(D_SEC, "no mapping for uid %u\n", pud->pud_uid);
 254                 return -EACCES;
 255         }
 256
 257         if (pud->pud_uid == pud->pud_fsuid) {
 258                 fsuid = uid;
 259         } else {
 260                 fsuid = lustre_idmap_lookup_uid(NULL, idmap, 0, pud->pud_fsuid);
 261                 if (fsuid == CFS_IDMAP_NOTFOUND) {
 262                         CDEBUG(D_SEC, "no mapping for fsuid %u\n",
 263                                pud->pud_fsuid);
 264                         return -EACCES;
 265                 }
 266         }
 267
 268         gid = lustre_idmap_lookup_gid(NULL, idmap, 0, pud->pud_gid);
 269         if (gid == CFS_IDMAP_NOTFOUND) {
 270                 CDEBUG(D_SEC, "no mapping for gid %u\n", pud->pud_gid);
 271                 return -EACCES;
 272         }
 273
 274         if (pud->pud_gid == pud->pud_fsgid) {
 275                 fsgid = gid;
 276         } else {
 277                 fsgid = lustre_idmap_lookup_gid(NULL, idmap, 0, pud->pud_fsgid);
 278                 if (fsgid == CFS_IDMAP_NOTFOUND) {
 279                         CDEBUG(D_SEC, "no mapping for fsgid %u\n",
 280                                pud->pud_fsgid);
 281                         return -EACCES;
 282                 }
 283         }
 284
 285         pud->pud_uid = uid;
 286         pud->pud_gid = gid;
 287         pud->pud_fsuid = fsuid;
 288         pud->pud_fsgid = fsgid;
 289
 290         return 0;
 291 }
 292
 293 /*
 294  * Reverse mapping
 295  */
 296 void mdt_body_reverse_idmap(struct mdt_thread_info *info, struct mdt_body *body)
 297 {
 298         struct ptlrpc_request     *req = mdt_info_req(info);
 299         struct md_ucred           *uc = mdt_ucred(info);
 300         struct mdt_export_data    *med = mdt_req2med(req);
 301         struct lustre_idmap_table *idmap = med->med_idmap;
 302
 303         if (!med->med_rmtclient)
 304                 return;
 305
 306         if (body->valid & OBD_MD_FLUID) {
 307                 uid_t uid = lustre_idmap_lookup_uid(uc, idmap, 1, body->uid);
 308
 309                 if (uid == CFS_IDMAP_NOTFOUND) {
 310                         uid = NOBODY_UID;
 311                         if (body->valid & OBD_MD_FLMODE)
 312                                 body->mode = (body->mode & ~S_IRWXU) |
 313                                              ((body->mode & S_IRWXO) << 6);
 314                 }
 315
 316                 body->uid = uid;
 317         }
 318
 319         if (body->valid & OBD_MD_FLGID) {
 320                 gid_t gid = lustre_idmap_lookup_gid(uc, idmap, 1, body->gid);
 321
 322                 if (gid == CFS_IDMAP_NOTFOUND) {
 323                         gid = NOBODY_GID;
 324                         if (body->valid & OBD_MD_FLMODE)
 325                                 body->mode = (body->mode & ~S_IRWXG) |
 326                                              ((body->mode & S_IRWXO) << 3);
 327                 }
 328
 329                 body->gid = gid;
 330         }
 331 }
 332
 333 /* Do not ignore root_squash for non-setattr case. */
 334 int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
 335 {
 336         struct ptlrpc_request     *req = mdt_info_req(info);
 337         struct md_ucred           *uc = mdt_ucred(info);
 338         struct lu_attr            *attr = &info->mti_attr.ma_attr;
 339         struct mdt_export_data    *med = mdt_req2med(req);
 340         struct lustre_idmap_table *idmap = med->med_idmap;
 341
 342         if ((uc->mu_valid != UCRED_OLD) && (uc->mu_valid != UCRED_NEW))
 343                 return -EINVAL;
 344
 345         if (op != REINT_SETATTR) {
 346                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
 347                         attr->la_uid = uc->mu_fsuid;
 348                 /* for S_ISGID, inherit gid from his parent, such work will be
 349                  * done in cmm/mdd layer, here set all cases as uc->mu_fsgid. */
 350                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
 351                         attr->la_gid = uc->mu_fsgid;
 352         } else if (med->med_rmtclient) {
 353                 /* NB: -1 case will be handled by mdt_fix_attr() later. */
 354                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1)) {
 355                         uid_t uid = lustre_idmap_lookup_uid(uc, idmap, 0,
 356                                                             attr->la_uid);
 357
 358                         if (uid == CFS_IDMAP_NOTFOUND) {
 359                                 CDEBUG(D_SEC, "Deny chown to uid %u\n",
 360                                        attr->la_uid);
 361                                 return -EPERM;
 362                         }
 363
 364                         attr->la_uid = uid;
 365                 }
 366                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1)) {
 367                         gid_t gid = lustre_idmap_lookup_gid(uc, idmap, 0,
 368                                                             attr->la_gid);
 369
 370                         if (gid == CFS_IDMAP_NOTFOUND) {
 371                                 CDEBUG(D_SEC, "Deny chown to gid %u\n",
 372                                        attr->la_gid);
 373                                 return -EPERM;
 374                         }
 375
 376                         attr->la_gid = gid;
 377                 }
 378         }
 379
 380         return 0;
 381 }