Line data    Source code

       1             : /*
       2             :  * Store posix-level xattrs in a tdb
       3             :  *
       4             :  * Copyright (C) Andrew Bartlett 2011
       5             :  *
       6             :  * extracted from vfs_xattr_tdb by
       7             :  *
       8             :  * Copyright (C) Volker Lendecke, 2007
       9             :  *
      10             :  * This program is free software; you can redistribute it and/or modify
      11             :  * it under the terms of the GNU General Public License as published by
      12             :  * the Free Software Foundation; either version 3 of the License, or
      13             :  * (at your option) any later version.
      14             :  *
      15             :  * This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
      22             :  */
      23             : 
      24             : #include "source3/include/includes.h"
      25             : #include "system/filesys.h"
      26             : #include "librpc/gen_ndr/xattr.h"
      27             : #include "librpc/gen_ndr/ndr_xattr.h"
      28             : #include "librpc/gen_ndr/file_id.h"
      29             : #include "dbwrap/dbwrap.h"
      30             : #include "lib/util/util_tdb.h"
      31             : #include "source3/lib/xattr_tdb.h"
      32             : #include "source3/lib/file_id.h"
      33             : 
      34             : #undef DBGC_CLASS
      35             : #define DBGC_CLASS DBGC_VFS
      36             : 
      37             : /*
      38             :  * unmarshall tdb_xattrs
      39             :  */
      40             : 
      41    21175185 : static NTSTATUS xattr_tdb_pull_attrs(TALLOC_CTX *mem_ctx,
      42             :                                      const TDB_DATA *data,
      43             :                                      struct tdb_xattrs **presult)
      44             : {
      45       63350 :         DATA_BLOB blob;
      46       63350 :         enum ndr_err_code ndr_err;
      47       63350 :         struct tdb_xattrs *result;
      48             : 
      49    21175185 :         if (!(result = talloc_zero(mem_ctx, struct tdb_xattrs))) {
      50           0 :                 return NT_STATUS_NO_MEMORY;
      51             :         }
      52             : 
      53    21175185 :         if (data->dsize == 0) {
      54      159998 :                 *presult = result;
      55      159998 :                 return NT_STATUS_OK;
      56             :         }
      57             : 
      58    21015187 :         blob = data_blob_const(data->dptr, data->dsize);
      59             : 
      60    21015187 :         ndr_err = ndr_pull_struct_blob(&blob, result, result,
      61             :                 (ndr_pull_flags_fn_t)ndr_pull_tdb_xattrs);
      62             : 
      63    21015187 :         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
      64           0 :                 DEBUG(0, ("ndr_pull_tdb_xattrs failed: %s\n",
      65             :                           ndr_errstr(ndr_err)));
      66           0 :                 TALLOC_FREE(result);
      67           0 :                 return ndr_map_error2ntstatus(ndr_err);
      68             :         }
      69             : 
      70    21015187 :         *presult = result;
      71    21015187 :         return NT_STATUS_OK;
      72             : }
      73             : 
      74             : /*
      75             :  * marshall tdb_xattrs
      76             :  */
      77             : 
      78      792646 : static NTSTATUS xattr_tdb_push_attrs(TALLOC_CTX *mem_ctx,
      79             :                                      const struct tdb_xattrs *attribs,
      80             :                                      TDB_DATA *data)
      81             : {
      82        2834 :         DATA_BLOB blob;
      83        2834 :         enum ndr_err_code ndr_err;
      84             : 
      85      792646 :         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, attribs,
      86             :                 (ndr_push_flags_fn_t)ndr_push_tdb_xattrs);
      87             : 
      88      792646 :         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
      89           0 :                 DEBUG(0, ("ndr_push_tdb_xattrs failed: %s\n",
      90             :                           ndr_errstr(ndr_err)));
      91           0 :                 return ndr_map_error2ntstatus(ndr_err);
      92             :         }
      93             : 
      94      792646 :         *data = make_tdb_data(blob.data, blob.length);
      95      792646 :         return NT_STATUS_OK;
      96             : }
      97             : 
      98             : /*
      99             :  * Load tdb_xattrs for a file from the tdb
     100             :  */
     101             : 
     102    24470833 : static NTSTATUS xattr_tdb_load_attrs(TALLOC_CTX *mem_ctx,
     103             :                                      struct db_context *db_ctx,
     104             :                                      const struct file_id *id,
     105             :                                      struct tdb_xattrs **presult)
     106             : {
     107       87650 :         uint8_t id_buf[16];
     108       87650 :         NTSTATUS status;
     109       87650 :         TDB_DATA data;
     110             : 
     111             :         /* For backwards compatibility only store the dev/inode. */
     112    24470833 :         push_file_id_16((char *)id_buf, id);
     113             : 
     114    24470833 :         status = dbwrap_fetch(db_ctx, mem_ctx,
     115             :                               make_tdb_data(id_buf, sizeof(id_buf)),
     116             :                               &data);
     117    24470833 :         if (!NT_STATUS_IS_OK(status)) {
     118     4088657 :                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
     119     4088657 :                         return status;
     120             :                 }
     121           0 :                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
     122             :         }
     123             : 
     124    20382176 :         status = xattr_tdb_pull_attrs(mem_ctx, &data, presult);
     125    20382176 :         TALLOC_FREE(data.dptr);
     126    20382176 :         return status;
     127             : }
     128             : 
     129             : /*
     130             :  * fetch_lock the tdb_ea record for a file
     131             :  */
     132             : 
     133     1113627 : static struct db_record *xattr_tdb_lock_attrs(TALLOC_CTX *mem_ctx,
     134             :                                               struct db_context *db_ctx,
     135             :                                               const struct file_id *id)
     136             : {
     137        3521 :         uint8_t id_buf[16];
     138             : 
     139             :         /* For backwards compatibility only store the dev/inode. */
     140     1113627 :         push_file_id_16((char *)id_buf, id);
     141     1113627 :         return dbwrap_fetch_locked(db_ctx, mem_ctx,
     142             :                                    make_tdb_data(id_buf, sizeof(id_buf)));
     143             : }
     144             : 
     145             : /*
     146             :  * Save tdb_xattrs to a previously fetch_locked record
     147             :  */
     148             : 
     149      792646 : static NTSTATUS xattr_tdb_save_attrs(struct db_record *rec,
     150             :                                      const struct tdb_xattrs *attribs)
     151             : {
     152      792646 :         TDB_DATA data = tdb_null;
     153        2834 :         NTSTATUS status;
     154             : 
     155      792646 :         status = xattr_tdb_push_attrs(talloc_tos(), attribs, &data);
     156             : 
     157      792646 :         if (!NT_STATUS_IS_OK(status)) {
     158           0 :                 DEBUG(0, ("xattr_tdb_push_attrs failed: %s\n",
     159             :                           nt_errstr(status)));
     160           0 :                 return status;
     161             :         }
     162             : 
     163      792646 :         status = dbwrap_record_store(rec, data, 0);
     164             : 
     165      792646 :         TALLOC_FREE(data.dptr);
     166             : 
     167      792646 :         return status;
     168             : }
     169             : 
     170             : /*
     171             :  * Worker routine for getxattr and fgetxattr
     172             :  */
     173             : 
     174    23736419 : ssize_t xattr_tdb_getattr(struct db_context *db_ctx,
     175             :                           TALLOC_CTX *mem_ctx,
     176             :                           const struct file_id *id,
     177             :                           const char *name, DATA_BLOB *blob)
     178             : {
     179       86579 :         struct tdb_xattrs *attribs;
     180       86579 :         uint32_t i;
     181    23736419 :         ssize_t result = -1;
     182       86579 :         NTSTATUS status;
     183    23736419 :         TALLOC_CTX *frame = talloc_stackframe();
     184       86579 :         struct file_id_buf buf;
     185             : 
     186    23736419 :         DBG_DEBUG("xattr_tdb_getattr called for file %s, name %s\n",
     187             :                   file_id_str_buf(*id, &buf), name);
     188             : 
     189    23736419 :         status = xattr_tdb_load_attrs(frame, db_ctx, id, &attribs);
     190             : 
     191    23736419 :         if (!NT_STATUS_IS_OK(status)) {
     192     4051675 :                 DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
     193             :                            nt_errstr(status)));
     194     4051675 :                 TALLOC_FREE(frame);
     195     4051675 :                 errno = EINVAL;
     196     4051675 :                 return -1;
     197             :         }
     198             : 
     199    52733399 :         for (i=0; i<attribs->num_eas; i++) {
     200    49478355 :                 if (strcmp(attribs->eas[i].name, name) == 0) {
     201    16373224 :                         break;
     202             :                 }
     203             :         }
     204             : 
     205    19684744 :         if (i == attribs->num_eas) {
     206     3255044 :                 errno = ENOATTR;
     207     3255044 :                 goto fail;
     208             :         }
     209             : 
     210    16429700 :         *blob = attribs->eas[i].value;
     211    16429700 :         talloc_steal(mem_ctx, blob->data);
     212    16429700 :         result = attribs->eas[i].value.length;
     213             : 
     214    19684744 :  fail:
     215    19684744 :         TALLOC_FREE(frame);
     216    19625263 :         return result;
     217             : }
     218             : 
     219             : /*
     220             :  * Worker routine for setxattr and fsetxattr
     221             :  */
     222             : 
     223      790927 : int xattr_tdb_setattr(struct db_context *db_ctx,
     224             :                       const struct file_id *id, const char *name,
     225             :                       const void *value, size_t size, int flags)
     226             : {
     227        2623 :         NTSTATUS status;
     228        2623 :         struct db_record *rec;
     229        2623 :         struct tdb_xattrs *attribs;
     230        2623 :         uint32_t i;
     231        2623 :         TDB_DATA data;
     232      790927 :         TALLOC_CTX *frame = talloc_stackframe();
     233        2623 :         struct file_id_buf buf;
     234             : 
     235      790927 :         DBG_DEBUG("xattr_tdb_setattr called for file %s, name %s\n",
     236             :                   file_id_str_buf(*id, &buf), name);
     237             : 
     238      790927 :         rec = xattr_tdb_lock_attrs(frame, db_ctx, id);
     239             : 
     240      790927 :         if (rec == NULL) {
     241           0 :                 DEBUG(0, ("xattr_tdb_lock_attrs failed\n"));
     242           0 :                 errno = EINVAL;
     243           0 :                 return -1;
     244             :         }
     245             : 
     246      790927 :         data = dbwrap_record_get_value(rec);
     247             : 
     248      790927 :         status = xattr_tdb_pull_attrs(rec, &data, &attribs);
     249             : 
     250      790927 :         if (!NT_STATUS_IS_OK(status)) {
     251           0 :                 DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
     252             :                            nt_errstr(status)));
     253           0 :                 TALLOC_FREE(frame);
     254           0 :                 return -1;
     255             :         }
     256             : 
     257     2384987 :         for (i=0; i<attribs->num_eas; i++) {
     258     1626486 :                 if (strcmp(attribs->eas[i].name, name) == 0) {
     259       32426 :                         if (flags & XATTR_CREATE) {
     260           0 :                                 TALLOC_FREE(frame);
     261           0 :                                 errno = EEXIST;
     262           0 :                                 return -1;
     263             :                         }
     264       32164 :                         break;
     265             :                 }
     266             :         }
     267             : 
     268      790927 :         if (i == attribs->num_eas) {
     269        2361 :                 struct xattr_EA *tmp;
     270             : 
     271      758501 :                 if (flags & XATTR_REPLACE) {
     272           0 :                         TALLOC_FREE(frame);
     273           0 :                         errno = ENOATTR;
     274           0 :                         return -1;
     275             :                 }
     276             : 
     277      758501 :                 tmp = talloc_realloc(
     278             :                         attribs, attribs->eas, struct xattr_EA,
     279             :                         attribs->num_eas+ 1);
     280             : 
     281      758501 :                 if (tmp == NULL) {
     282           0 :                         DEBUG(0, ("talloc_realloc failed\n"));
     283           0 :                         TALLOC_FREE(frame);
     284           0 :                         errno = ENOMEM;
     285           0 :                         return -1;
     286             :                 }
     287             : 
     288      758501 :                 attribs->eas = tmp;
     289      758501 :                 attribs->num_eas += 1;
     290             :         }
     291             : 
     292      790927 :         attribs->eas[i].name = name;
     293      790927 :         attribs->eas[i].value.data = discard_const_p(uint8_t, value);
     294      790927 :         attribs->eas[i].value.length = size;
     295             : 
     296      790927 :         status = xattr_tdb_save_attrs(rec, attribs);
     297             : 
     298      790927 :         TALLOC_FREE(frame);
     299             : 
     300      790927 :         if (!NT_STATUS_IS_OK(status)) {
     301           0 :                 DEBUG(1, ("save failed: %s\n", nt_errstr(status)));
     302           0 :                 return -1;
     303             :         }
     304             : 
     305      788304 :         return 0;
     306             : }
     307             : 
     308             : /*
     309             :  * Worker routine for listxattr and flistxattr
     310             :  */
     311             : 
     312      734414 : ssize_t xattr_tdb_listattr(struct db_context *db_ctx,
     313             :                            const struct file_id *id, char *list,
     314             :                            size_t size)
     315             : {
     316        1071 :         NTSTATUS status;
     317        1071 :         struct tdb_xattrs *attribs;
     318        1071 :         uint32_t i;
     319      734414 :         size_t len = 0;
     320      734414 :         TALLOC_CTX *frame = talloc_stackframe();
     321             : 
     322      734414 :         status = xattr_tdb_load_attrs(frame, db_ctx, id, &attribs);
     323             : 
     324      734414 :         if (!NT_STATUS_IS_OK(status) &&
     325       36941 :             !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND))
     326             :         {
     327           0 :                 DEBUG(0, ("xattr_tdb_fetch_attrs failed: %s\n",
     328             :                            nt_errstr(status)));
     329           0 :                 errno = EINVAL;
     330           0 :                 TALLOC_FREE(frame);
     331           0 :                 return -1;
     332             :         }
     333             : 
     334      734414 :         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
     335       36982 :                 TALLOC_FREE(frame);
     336       36982 :                 return 0;
     337             :         }
     338             : 
     339      697432 :         DEBUG(10, ("xattr_tdb_listattr: Found %d xattrs\n",
     340             :                    attribs->num_eas));
     341             : 
     342     4137254 :         for (i=0; i<attribs->num_eas; i++) {
     343        5843 :                 size_t tmp;
     344             : 
     345     3439822 :                 DEBUG(10, ("xattr_tdb_listattr: xattrs[i].name: %s\n",
     346             :                            attribs->eas[i].name));
     347             : 
     348     3439822 :                 tmp = strlen(attribs->eas[i].name);
     349             : 
     350             :                 /*
     351             :                  * Try to protect against overflow
     352             :                  */
     353             : 
     354     3439822 :                 if (len + (tmp+1) < len) {
     355           0 :                         TALLOC_FREE(frame);
     356           0 :                         errno = EINVAL;
     357           0 :                         return -1;
     358             :                 }
     359             : 
     360             :                 /*
     361             :                  * Take care of the terminating NULL
     362             :                  */
     363     3439822 :                 len += (tmp + 1);
     364             :         }
     365             : 
     366      697432 :         if (len > size) {
     367           0 :                 TALLOC_FREE(frame);
     368           0 :                 errno = ERANGE;
     369           0 :                 return len;
     370             :         }
     371             : 
     372      696402 :         len = 0;
     373             : 
     374     4137254 :         for (i=0; i<attribs->num_eas; i++) {
     375     3439822 :                 strlcpy(list+len, attribs->eas[i].name,
     376             :                         size-len);
     377     3439822 :                 len += (strlen(attribs->eas[i].name) + 1);
     378             :         }
     379             : 
     380      697432 :         TALLOC_FREE(frame);
     381      697432 :         return len;
     382             : }
     383             : 
     384             : /*
     385             :  * Worker routine for removexattr and fremovexattr
     386             :  */
     387             : 
     388        2082 : int xattr_tdb_removeattr(struct db_context *db_ctx,
     389             :                          const struct file_id *id, const char *name)
     390             : {
     391         216 :         NTSTATUS status;
     392         216 :         struct db_record *rec;
     393         216 :         struct tdb_xattrs *attribs;
     394         216 :         uint32_t i;
     395         216 :         TDB_DATA value;
     396             : 
     397        2082 :         rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id);
     398             : 
     399        2082 :         if (rec == NULL) {
     400           0 :                 DEBUG(0, ("xattr_tdb_lock_attrs failed\n"));
     401           0 :                 errno = EINVAL;
     402           0 :                 return -1;
     403             :         }
     404             : 
     405        2082 :         value = dbwrap_record_get_value(rec);
     406             : 
     407        2082 :         status = xattr_tdb_pull_attrs(rec, &value, &attribs);
     408             : 
     409        2082 :         if (!NT_STATUS_IS_OK(status)) {
     410           0 :                 DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
     411             :                            nt_errstr(status)));
     412           0 :                 TALLOC_FREE(rec);
     413           0 :                 return -1;
     414             :         }
     415             : 
     416       10091 :         for (i=0; i<attribs->num_eas; i++) {
     417        9728 :                 if (strcmp(attribs->eas[i].name, name) == 0) {
     418        1508 :                         break;
     419             :                 }
     420             :         }
     421             : 
     422        2082 :         if (i == attribs->num_eas) {
     423         363 :                 TALLOC_FREE(rec);
     424         363 :                 errno = ENOATTR;
     425         363 :                 return -1;
     426             :         }
     427             : 
     428        1719 :         attribs->eas[i] =
     429        1719 :                 attribs->eas[attribs->num_eas-1];
     430        1719 :         attribs->num_eas -= 1;
     431             : 
     432        1719 :         if (attribs->num_eas == 0) {
     433           0 :                 dbwrap_record_delete(rec);
     434           0 :                 TALLOC_FREE(rec);
     435           0 :                 return 0;
     436             :         }
     437             : 
     438        1719 :         status = xattr_tdb_save_attrs(rec, attribs);
     439             : 
     440        1719 :         TALLOC_FREE(rec);
     441             : 
     442        1719 :         if (!NT_STATUS_IS_OK(status)) {
     443           0 :                 DEBUG(1, ("save failed: %s\n", nt_errstr(status)));
     444           0 :                 return -1;
     445             :         }
     446             : 
     447        1508 :         return 0;
     448             : }
     449             : 
     450             : /*
     451             :  * Worker routine for unlink and rmdir
     452             :  */
     453             : 
     454      320618 : void xattr_tdb_remove_all_attrs(struct db_context *db_ctx,
     455             :                                const struct file_id *id)
     456             : {
     457         682 :         struct db_record *rec;
     458      320618 :         rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id);
     459             : 
     460             :         /*
     461             :          * If rec == NULL there's not much we can do about it
     462             :          */
     463             : 
     464      320618 :         if (rec != NULL) {
     465      320618 :                 dbwrap_record_delete(rec);
     466      320618 :                 TALLOC_FREE(rec);
     467             :         }
     468      320618 : }