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