source3/modules/nfs4_acls.c

   1 /*
   2  * NFS4 ACL handling
   3  *
   4  * Copyright (C) Jim McDonough, 2006
   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 as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "smbd/smbd.h"
  22 #include "nfs4_acls.h"
  23 #include "librpc/gen_ndr/ndr_security.h"
  24 #include "../libcli/security/dom_sid.h"
  25 #include "../libcli/security/security.h"
  26 #include "dbwrap/dbwrap.h"
  27 #include "dbwrap/dbwrap_open.h"
  28 #include "system/filesys.h"
  29 #include "passdb/lookup_sid.h"
  30 #include "util_tdb.h"
  31 #include "lib/param/loadparm.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_ACLS
  35
  36 #define SMBACL4_PARAM_TYPE_NAME "nfs4"
  37
  38 extern const struct generic_mapping file_generic_mapping;
  39
  40 struct SMB4ACE_T
  41 {
  42         SMB_ACE4PROP_T  prop;
  43         struct SMB4ACE_T *next;
  44 };
  45
  46 struct SMB4ACL_T
  47 {
  48         uint16_t controlflags;
  49         uint32_t naces;
  50         struct SMB4ACE_T        *first;
  51         struct SMB4ACE_T        *last;
  52 };
  53
  54 enum smbacl4_mode_enum {e_simple=0, e_special=1};
  55 enum smbacl4_acedup_enum {e_dontcare=0, e_reject=1, e_ignore=2, e_merge=3};
  56
  57 typedef struct _smbacl4_vfs_params {
  58         enum smbacl4_mode_enum mode;
  59         bool do_chown;
  60         enum smbacl4_acedup_enum acedup;
  61         bool map_full_control;
  62 } smbacl4_vfs_params;
  63
  64 /*
  65  * Gather special parameters for NFS4 ACL handling
  66  */
  67 static int smbacl4_get_vfs_params(
  68         struct connection_struct *conn,
  69         smbacl4_vfs_params *params
  70 )
  71 {
  72         static const struct enum_list enum_smbacl4_modes[] = {
  73                 { e_simple, "simple" },
  74                 { e_special, "special" },
  75                 { -1 , NULL }
  76         };
  77         static const struct enum_list enum_smbacl4_acedups[] = {
  78                 { e_dontcare, "dontcare" },
  79                 { e_reject, "reject" },
  80                 { e_ignore, "ignore" },
  81                 { e_merge, "merge" },
  82                 { -1 , NULL }
  83         };
  84         int enumval;
  85
  86         ZERO_STRUCTP(params);
  87
  88         enumval = lp_parm_enum(SNUM(conn), SMBACL4_PARAM_TYPE_NAME, "mode",
  89                                enum_smbacl4_modes, e_simple);
  90         if (enumval == -1) {
  91                 DEBUG(10, ("value for %s:mode unknown\n",
  92                            SMBACL4_PARAM_TYPE_NAME));
  93                 return -1;
  94         }
  95         params->mode = (enum smbacl4_mode_enum)enumval;
  96
  97         params->do_chown = lp_parm_bool(SNUM(conn), SMBACL4_PARAM_TYPE_NAME,
  98                 "chown", true);
  99
 100         enumval = lp_parm_enum(SNUM(conn), SMBACL4_PARAM_TYPE_NAME, "acedup",
 101                                enum_smbacl4_acedups, e_dontcare);
 102         if (enumval == -1) {
 103                 DEBUG(10, ("value for %s:acedup unknown\n",
 104                            SMBACL4_PARAM_TYPE_NAME));
 105                 return -1;
 106         }
 107         params->acedup = (enum smbacl4_acedup_enum)enumval;
 108
 109         params->map_full_control = lp_acl_map_full_control(SNUM(conn));
 110
 111         DEBUG(10, ("mode:%s, do_chown:%s, acedup: %s map full control:%s\n",
 112                 enum_smbacl4_modes[params->mode].name,
 113                 params->do_chown ? "true" : "false",
 114                 enum_smbacl4_acedups[params->acedup].name,
 115                 params->map_full_control ? "true" : "false"));
 116
 117         return 0;
 118 }
 119
 120 /************************************************
 121  Split the ACE flag mapping between nfs4 and Windows
 122  into two separate functions rather than trying to do
 123  it inline. Allows us to carefully control what flags
 124  are mapped to what in one place.
 125 ************************************************/
 126
 127 static uint32_t map_nfs4_ace_flags_to_windows_ace_flags(
 128         uint32_t nfs4_ace_flags)
 129 {
 130         uint32_t win_ace_flags = 0;
 131
 132         /* The nfs4 flags <= 0xf map perfectly. */
 133         win_ace_flags = nfs4_ace_flags & (SEC_ACE_FLAG_OBJECT_INHERIT|
 134                                       SEC_ACE_FLAG_CONTAINER_INHERIT|
 135                                       SEC_ACE_FLAG_NO_PROPAGATE_INHERIT|
 136                                       SEC_ACE_FLAG_INHERIT_ONLY);
 137
 138         /* flags greater than 0xf have diverged :-(. */
 139         /* See the nfs4 ace flag definitions here:
 140            http://www.ietf.org/rfc/rfc3530.txt.
 141            And the Windows ace flag definitions here:
 142            librpc/idl/security.idl. */
 143         if (nfs4_ace_flags & SMB_ACE4_INHERITED_ACE) {
 144                 win_ace_flags |= SEC_ACE_FLAG_INHERITED_ACE;
 145         }
 146
 147         return win_ace_flags;
 148 }
 149
 150 static uint32_t map_windows_ace_flags_to_nfs4_ace_flags(uint32_t win_ace_flags)
 151 {
 152         uint32_t nfs4_ace_flags = 0;
 153
 154         /* The windows flags <= 0xf map perfectly. */
 155         nfs4_ace_flags = win_ace_flags & (SMB_ACE4_FILE_INHERIT_ACE|
 156                                       SMB_ACE4_DIRECTORY_INHERIT_ACE|
 157                                       SMB_ACE4_NO_PROPAGATE_INHERIT_ACE|
 158                                       SMB_ACE4_INHERIT_ONLY_ACE);
 159
 160         /* flags greater than 0xf have diverged :-(. */
 161         /* See the nfs4 ace flag definitions here:
 162            http://www.ietf.org/rfc/rfc3530.txt.
 163            And the Windows ace flag definitions here:
 164            librpc/idl/security.idl. */
 165         if (win_ace_flags & SEC_ACE_FLAG_INHERITED_ACE) {
 166                 nfs4_ace_flags |= SMB_ACE4_INHERITED_ACE;
 167         }
 168
 169         return nfs4_ace_flags;
 170 }
 171
 172 struct SMB4ACL_T *smb_create_smb4acl(TALLOC_CTX *mem_ctx)
 173 {
 174         struct SMB4ACL_T *theacl;
 175
 176         theacl = talloc_zero(mem_ctx, struct SMB4ACL_T);
 177         if (theacl==NULL)
 178         {
 179                 DEBUG(0, ("TALLOC_SIZE failed\n"));
 180                 errno = ENOMEM;
 181                 return NULL;
 182         }
 183         theacl->controlflags = SEC_DESC_SELF_RELATIVE;
 184         /* theacl->first, last = NULL not needed */
 185         return theacl;
 186 }
 187
 188 struct SMB4ACE_T *smb_add_ace4(struct SMB4ACL_T *acl, SMB_ACE4PROP_T *prop)
 189 {
 190         struct SMB4ACE_T *ace;
 191
 192         ace = talloc_zero(acl, struct SMB4ACE_T);
 193         if (ace==NULL)
 194         {
 195                 DEBUG(0, ("TALLOC_SIZE failed\n"));
 196                 errno = ENOMEM;
 197                 return NULL;
 198         }
 199         /* ace->next = NULL not needed */
 200         memcpy(&ace->prop, prop, sizeof(SMB_ACE4PROP_T));
 201
 202         if (acl->first==NULL)
 203         {
 204                 acl->first = ace;
 205                 acl->last = ace;
 206         } else {
 207                 acl->last->next = ace;
 208                 acl->last = ace;
 209         }
 210         acl->naces++;
 211
 212         return ace;
 213 }
 214
 215 SMB_ACE4PROP_T *smb_get_ace4(struct SMB4ACE_T *ace)
 216 {
 217         if (ace == NULL) {
 218                 return NULL;
 219         }
 220
 221         return &ace->prop;
 222 }
 223
 224 struct SMB4ACE_T *smb_next_ace4(struct SMB4ACE_T *ace)
 225 {
 226         if (ace == NULL) {
 227                 return NULL;
 228         }
 229
 230         return ace->next;
 231 }
 232
 233 struct SMB4ACE_T *smb_first_ace4(struct SMB4ACL_T *acl)
 234 {
 235         if (acl == NULL) {
 236                 return NULL;
 237         }
 238
 239         return acl->first;
 240 }
 241
 242 uint32_t smb_get_naces(struct SMB4ACL_T *acl)
 243 {
 244         if (acl == NULL) {
 245                 return 0;
 246         }
 247
 248         return acl->naces;
 249 }
 250
 251 uint16_t smbacl4_get_controlflags(struct SMB4ACL_T *acl)
 252 {
 253         if (acl == NULL) {
 254                 return 0;
 255         }
 256
 257         return acl->controlflags;
 258 }
 259
 260 bool smbacl4_set_controlflags(struct SMB4ACL_T *acl, uint16_t controlflags)
 261 {
 262         if (acl == NULL) {
 263                 return false;
 264         }
 265
 266         acl->controlflags = controlflags;
 267         return true;
 268 }
 269
 270 static int smbacl4_GetFileOwner(struct connection_struct *conn,
 271                                 const char *filename,
 272                                 SMB_STRUCT_STAT *psbuf)
 273 {
 274         ZERO_STRUCTP(psbuf);
 275
 276         /* Get the stat struct for the owner info. */
 277         if (vfs_stat_smb_basename(conn, filename, psbuf) != 0)
 278         {
 279                 DEBUG(8, ("vfs_stat_smb_basename failed with error %s\n",
 280                         strerror(errno)));
 281                 return -1;
 282         }
 283
 284         return 0;
 285 }
 286
 287 static int smbacl4_fGetFileOwner(files_struct *fsp, SMB_STRUCT_STAT *psbuf)
 288 {
 289         ZERO_STRUCTP(psbuf);
 290
 291         if (fsp->fh->fd == -1) {
 292                 return smbacl4_GetFileOwner(fsp->conn,
 293                                             fsp->fsp_name->base_name, psbuf);
 294         }
 295         if (SMB_VFS_FSTAT(fsp, psbuf) != 0)
 296         {
 297                 DEBUG(8, ("SMB_VFS_FSTAT failed with error %s\n",
 298                         strerror(errno)));
 299                 return -1;
 300         }
 301
 302         return 0;
 303 }
 304
 305 static bool smbacl4_nfs42win(TALLOC_CTX *mem_ctx,
 306         smbacl4_vfs_params *params,
 307         struct SMB4ACL_T *acl, /* in */
 308         struct dom_sid *psid_owner, /* in */
 309         struct dom_sid *psid_group, /* in */
 310         bool is_directory, /* in */
 311         struct security_ace **ppnt_ace_list, /* out */
 312         int *pgood_aces /* out */
 313 )
 314 {
 315         struct SMB4ACE_T *aceint;
 316         struct security_ace *nt_ace_list = NULL;
 317         int good_aces = 0;
 318
 319         DEBUG(10, ("%s entered\n", __func__));
 320
 321         nt_ace_list = talloc_zero_array(mem_ctx, struct security_ace,
 322                                         2 * acl->naces);
 323         if (nt_ace_list==NULL)
 324         {
 325                 DEBUG(10, ("talloc error with %d aces", acl->naces));
 326                 errno = ENOMEM;
 327                 return false;
 328         }
 329
 330         for (aceint = acl->first; aceint != NULL; aceint = aceint->next) {
 331                 uint32_t mask;
 332                 struct dom_sid sid;
 333                 SMB_ACE4PROP_T  *ace = &aceint->prop;
 334                 uint32_t win_ace_flags;
 335
 336                 DEBUG(10, ("type: %d, iflags: %x, flags: %x, "
 337                            "mask: %x, who: %d\n",
 338                            ace->aceType, ace->flags,
 339                            ace->aceFlags, ace->aceMask, ace->who.id));
 340
 341                 if (ace->flags & SMB_ACE4_ID_SPECIAL) {
 342                         switch (ace->who.special_id) {
 343                         case SMB_ACE4_WHO_OWNER:
 344                                 sid_copy(&sid, psid_owner);
 345                                 break;
 346                         case SMB_ACE4_WHO_GROUP:
 347                                 sid_copy(&sid, psid_group);
 348                                 break;
 349                         case SMB_ACE4_WHO_EVERYONE:
 350                                 sid_copy(&sid, &global_sid_World);
 351                                 break;
 352                         default:
 353                                 DEBUG(8, ("invalid special who id %d "
 354                                         "ignored\n", ace->who.special_id));
 355                                 continue;
 356                         }
 357                 } else {
 358                         if (ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP) {
 359                                 gid_to_sid(&sid, ace->who.gid);
 360                         } else {
 361                                 uid_to_sid(&sid, ace->who.uid);
 362                         }
 363                 }
 364                 DEBUG(10, ("mapped %d to %s\n", ace->who.id,
 365                            sid_string_dbg(&sid)));
 366
 367                 if (is_directory && (ace->aceMask & SMB_ACE4_ADD_FILE)) {
 368                         ace->aceMask |= SMB_ACE4_DELETE_CHILD;
 369                 }
 370
 371                 if (!is_directory && params->map_full_control) {
 372                         /*
 373                          * Do we have all access except DELETE_CHILD
 374                          * (not caring about the delete bit).
 375                          */
 376                         uint32_t test_mask = ((ace->aceMask|SMB_ACE4_DELETE|SMB_ACE4_DELETE_CHILD) &
 377                                                 SMB_ACE4_ALL_MASKS);
 378                         if (test_mask == SMB_ACE4_ALL_MASKS) {
 379                                 ace->aceMask |= SMB_ACE4_DELETE_CHILD;
 380                         }
 381                 }
 382
 383                 win_ace_flags = map_nfs4_ace_flags_to_windows_ace_flags(
 384                         ace->aceFlags);
 385                 if (!is_directory &&
 386                     (win_ace_flags & (SEC_ACE_FLAG_OBJECT_INHERIT|
 387                                       SEC_ACE_FLAG_CONTAINER_INHERIT))) {
 388                         /*
 389                          * GPFS sets inherits dir_inhert and file_inherit flags
 390                          * to files, too, which confuses windows, and seems to
 391                          * be wrong anyways. ==> Map these bits away for files.
 392                          */
 393                         DEBUG(10, ("removing inherit flags from nfs4 ace\n"));
 394                         win_ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
 395                                            SEC_ACE_FLAG_CONTAINER_INHERIT);
 396                 }
 397                 DEBUG(10, ("Windows mapped ace flags: 0x%x => 0x%x\n",
 398                       ace->aceFlags, win_ace_flags));
 399
 400                 mask = ace->aceMask;
 401                 /* Windows clients expect SYNC on acls to
 402                    correctly allow rename. See bug #7909. */
 403                 /* But not on DENY ace entries. See
 404                    bug #8442. */
 405                 if(ace->aceType == SMB_ACE4_ACCESS_ALLOWED_ACE_TYPE) {
 406                         mask = ace->aceMask | SMB_ACE4_SYNCHRONIZE;
 407                 }
 408
 409                 /* Mapping of owner@ and group@ to creator owner and
 410                    creator group. Keep old behavior in mode special. */
 411                 if (params->mode != e_special &&
 412                     ace->flags & SMB_ACE4_ID_SPECIAL &&
 413                     (ace->who.special_id == SMB_ACE4_WHO_OWNER ||
 414                      ace->who.special_id == SMB_ACE4_WHO_GROUP)) {
 415                         DEBUG(10, ("Map special entry\n"));
 416                         if (!(win_ace_flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
 417                                 uint32_t win_ace_flags_current;
 418                                 DEBUG(10, ("Map current sid\n"));
 419                                 win_ace_flags_current = win_ace_flags &
 420                                         ~(SEC_ACE_FLAG_OBJECT_INHERIT |
 421                                           SEC_ACE_FLAG_CONTAINER_INHERIT);
 422                                 init_sec_ace(&nt_ace_list[good_aces++], &sid,
 423                                              ace->aceType, mask,
 424                                              win_ace_flags_current);
 425                         }
 426                         if (ace->who.special_id == SMB_ACE4_WHO_OWNER &&
 427                             win_ace_flags & (SEC_ACE_FLAG_OBJECT_INHERIT |
 428                                              SEC_ACE_FLAG_CONTAINER_INHERIT)) {
 429                                 uint32_t win_ace_flags_creator;
 430                                 DEBUG(10, ("Map creator owner\n"));
 431                                 win_ace_flags_creator = win_ace_flags |
 432                                         SMB_ACE4_INHERIT_ONLY_ACE;
 433                                 init_sec_ace(&nt_ace_list[good_aces++],
 434                                              &global_sid_Creator_Owner,
 435                                              ace->aceType, mask,
 436                                              win_ace_flags_creator);
 437                         }
 438                         if (ace->who.special_id == SMB_ACE4_WHO_GROUP &&
 439                             win_ace_flags & (SEC_ACE_FLAG_OBJECT_INHERIT |
 440                                              SEC_ACE_FLAG_CONTAINER_INHERIT)) {
 441                                 uint32_t win_ace_flags_creator;
 442                                 DEBUG(10, ("Map creator owner group\n"));
 443                                 win_ace_flags_creator = win_ace_flags |
 444                                         SMB_ACE4_INHERIT_ONLY_ACE;
 445                                 init_sec_ace(&nt_ace_list[good_aces++],
 446                                              &global_sid_Creator_Group,
 447                                              ace->aceType, mask,
 448                                              win_ace_flags_creator);
 449                         }
 450                 } else {
 451                         DEBUG(10, ("Map normal sid\n"));
 452                         init_sec_ace(&nt_ace_list[good_aces++], &sid,
 453                                      ace->aceType, mask,
 454                                      win_ace_flags);
 455                 }
 456         }
 457
 458         nt_ace_list = talloc_realloc(mem_ctx, nt_ace_list, struct security_ace,
 459                                      good_aces);
 460
 461         /* returns a NULL ace list when good_aces is zero. */
 462         if (good_aces && nt_ace_list == NULL) {
 463                 DEBUG(10, ("realloc error with %d aces", good_aces));
 464                 errno = ENOMEM;
 465                 return false;
 466         }
 467
 468         *ppnt_ace_list = nt_ace_list;
 469         *pgood_aces = good_aces;
 470
 471         return true;
 472 }
 473
 474 static NTSTATUS smb_get_nt_acl_nfs4_common(const SMB_STRUCT_STAT *sbuf,
 475                                            smbacl4_vfs_params *params,
 476                                            uint32_t security_info,
 477                                            TALLOC_CTX *mem_ctx,
 478                                            struct security_descriptor **ppdesc,
 479                                            struct SMB4ACL_T *theacl)
 480 {
 481         int good_aces = 0;
 482         struct dom_sid sid_owner, sid_group;
 483         size_t sd_size = 0;
 484         struct security_ace *nt_ace_list = NULL;
 485         struct security_acl *psa = NULL;
 486         TALLOC_CTX *frame = talloc_stackframe();
 487         bool ok;
 488
 489         if (theacl==NULL) {
 490                 TALLOC_FREE(frame);
 491                 return NT_STATUS_ACCESS_DENIED; /* special because we
 492                                                  * need to think through
 493                                                  * the null case.*/
 494         }
 495
 496         uid_to_sid(&sid_owner, sbuf->st_ex_uid);
 497         gid_to_sid(&sid_group, sbuf->st_ex_gid);
 498
 499         ok = smbacl4_nfs42win(frame, params, theacl, &sid_owner, &sid_group,
 500                               S_ISDIR(sbuf->st_ex_mode),
 501                               &nt_ace_list, &good_aces);
 502         if (!ok) {
 503                 DEBUG(8,("smbacl4_nfs42win failed\n"));
 504                 TALLOC_FREE(frame);
 505                 return map_nt_error_from_unix(errno);
 506         }
 507
 508         psa = make_sec_acl(frame, NT4_ACL_REVISION, good_aces, nt_ace_list);
 509         if (psa == NULL) {
 510                 DEBUG(2,("make_sec_acl failed\n"));
 511                 TALLOC_FREE(frame);
 512                 return NT_STATUS_NO_MEMORY;
 513         }
 514
 515         DEBUG(10,("after make sec_acl\n"));
 516         *ppdesc = make_sec_desc(
 517                 mem_ctx, SD_REVISION, smbacl4_get_controlflags(theacl),
 518                 (security_info & SECINFO_OWNER) ? &sid_owner : NULL,
 519                 (security_info & SECINFO_GROUP) ? &sid_group : NULL,
 520                 NULL, psa, &sd_size);
 521         if (*ppdesc==NULL) {
 522                 DEBUG(2,("make_sec_desc failed\n"));
 523                 TALLOC_FREE(frame);
 524                 return NT_STATUS_NO_MEMORY;
 525         }
 526
 527         DEBUG(10, ("smb_get_nt_acl_nfs4_common successfully exited with "
 528                    "sd_size %d\n",
 529                    (int)ndr_size_security_descriptor(*ppdesc, 0)));
 530
 531         TALLOC_FREE(frame);
 532         return NT_STATUS_OK;
 533 }
 534
 535 NTSTATUS smb_fget_nt_acl_nfs4(files_struct *fsp,
 536                               uint32_t security_info,
 537                               TALLOC_CTX *mem_ctx,
 538                               struct security_descriptor **ppdesc,
 539                               struct SMB4ACL_T *theacl)
 540 {
 541         SMB_STRUCT_STAT sbuf;
 542         smbacl4_vfs_params params;
 543
 544         DEBUG(10, ("smb_fget_nt_acl_nfs4 invoked for %s\n", fsp_str_dbg(fsp)));
 545
 546         if (smbacl4_fGetFileOwner(fsp, &sbuf)) {
 547                 return map_nt_error_from_unix(errno);
 548         }
 549
 550         /* Special behaviours */
 551         if (smbacl4_get_vfs_params(fsp->conn, &params)) {
 552                 return NT_STATUS_NO_MEMORY;
 553         }
 554
 555         return smb_get_nt_acl_nfs4_common(&sbuf, &params, security_info,
 556                                           mem_ctx, ppdesc, theacl);
 557 }
 558
 559 NTSTATUS smb_get_nt_acl_nfs4(struct connection_struct *conn,
 560                              const char *name,
 561                              uint32_t security_info,
 562                              TALLOC_CTX *mem_ctx,
 563                              struct security_descriptor **ppdesc,
 564                              struct SMB4ACL_T *theacl)
 565 {
 566         SMB_STRUCT_STAT sbuf;
 567         smbacl4_vfs_params params;
 568
 569         DEBUG(10, ("smb_get_nt_acl_nfs4 invoked for %s\n", name));
 570
 571         if (smbacl4_GetFileOwner(conn, name, &sbuf)) {
 572                 return map_nt_error_from_unix(errno);
 573         }
 574
 575         /* Special behaviours */
 576         if (smbacl4_get_vfs_params(conn, &params)) {
 577                 return NT_STATUS_NO_MEMORY;
 578         }
 579
 580         return smb_get_nt_acl_nfs4_common(&sbuf, &params, security_info,
 581                                           mem_ctx, ppdesc, theacl);
 582 }
 583
 584 static void smbacl4_dump_nfs4acl(int level, struct SMB4ACL_T *acl)
 585 {
 586         struct SMB4ACE_T *aceint;
 587
 588         DEBUG(level, ("NFS4ACL: size=%d\n", acl->naces));
 589
 590         for (aceint = acl->first; aceint != NULL; aceint = aceint->next) {
 591                 SMB_ACE4PROP_T *ace = &aceint->prop;
 592
 593                 DEBUG(level, ("\tACE: type=%d, flags=0x%x, fflags=0x%x, "
 594                               "mask=0x%x, id=%d\n",
 595                               ace->aceType,
 596                               ace->aceFlags, ace->flags,
 597                               ace->aceMask,
 598                               ace->who.id));
 599         }
 600 }
 601
 602 /*
 603  * Find 2 NFS4 who-special ACE property (non-copy!!!)
 604  * match nonzero if "special" and who is equal
 605  * return ace if found matching; otherwise NULL
 606  */
 607 static SMB_ACE4PROP_T *smbacl4_find_equal_special(
 608         struct SMB4ACL_T *acl,
 609         SMB_ACE4PROP_T *aceNew)
 610 {
 611         struct SMB4ACE_T *aceint;
 612
 613         for (aceint = acl->first; aceint != NULL; aceint = aceint->next) {
 614                 SMB_ACE4PROP_T *ace = &aceint->prop;
 615
 616                 DEBUG(10,("ace type:0x%x flags:0x%x aceFlags:0x%x "
 617                           "new type:0x%x flags:0x%x aceFlags:0x%x\n",
 618                           ace->aceType, ace->flags, ace->aceFlags,
 619                           aceNew->aceType, aceNew->flags,aceNew->aceFlags));
 620
 621                 if (ace->flags == aceNew->flags &&
 622                         ace->aceType==aceNew->aceType &&
 623                         ace->aceFlags==aceNew->aceFlags)
 624                 {
 625                         /* keep type safety; e.g. gid is an u.short */
 626                         if (ace->flags & SMB_ACE4_ID_SPECIAL)
 627                         {
 628                                 if (ace->who.special_id ==
 629                                     aceNew->who.special_id)
 630                                         return ace;
 631                         } else {
 632                                 if (ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP)
 633                                 {
 634                                         if (ace->who.gid==aceNew->who.gid)
 635                                                 return ace;
 636                                 } else {
 637                                         if (ace->who.uid==aceNew->who.uid)
 638                                                 return ace;
 639                                 }
 640                         }
 641                 }
 642         }
 643
 644         return NULL;
 645 }
 646
 647
 648 static bool smbacl4_fill_ace4(
 649         const struct smb_filename *filename,
 650         smbacl4_vfs_params *params,
 651         uid_t ownerUID,
 652         gid_t ownerGID,
 653         const struct security_ace *ace_nt, /* input */
 654         SMB_ACE4PROP_T *ace_v4 /* output */
 655 )
 656 {
 657         DEBUG(10, ("got ace for %s\n", sid_string_dbg(&ace_nt->trustee)));
 658
 659         ZERO_STRUCTP(ace_v4);
 660
 661         /* only ACCESS|DENY supported right now */
 662         ace_v4->aceType = ace_nt->type;
 663
 664         ace_v4->aceFlags = map_windows_ace_flags_to_nfs4_ace_flags(
 665                 ace_nt->flags);
 666
 667         /* remove inheritance flags on files */
 668         if (VALID_STAT(filename->st) &&
 669             !S_ISDIR(filename->st.st_ex_mode)) {
 670                 DEBUG(10, ("Removing inheritance flags from a file\n"));
 671                 ace_v4->aceFlags &= ~(SMB_ACE4_FILE_INHERIT_ACE|
 672                                       SMB_ACE4_DIRECTORY_INHERIT_ACE|
 673                                       SMB_ACE4_NO_PROPAGATE_INHERIT_ACE|
 674                                       SMB_ACE4_INHERIT_ONLY_ACE);
 675         }
 676
 677         ace_v4->aceMask = ace_nt->access_mask &
 678                 (SEC_STD_ALL | SEC_FILE_ALL);
 679
 680         se_map_generic(&ace_v4->aceMask, &file_generic_mapping);
 681
 682         if (ace_v4->aceFlags!=ace_nt->flags)
 683                 DEBUG(9, ("ace_v4->aceFlags(0x%x)!=ace_nt->flags(0x%x)\n",
 684                         ace_v4->aceFlags, ace_nt->flags));
 685
 686         if (ace_v4->aceMask!=ace_nt->access_mask)
 687                 DEBUG(9, ("ace_v4->aceMask(0x%x)!=ace_nt->access_mask(0x%x)\n",
 688                         ace_v4->aceMask, ace_nt->access_mask));
 689
 690         if (dom_sid_equal(&ace_nt->trustee, &global_sid_World)) {
 691                 ace_v4->who.special_id = SMB_ACE4_WHO_EVERYONE;
 692                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
 693         } else if (params->mode!=e_special &&
 694                    dom_sid_equal(&ace_nt->trustee,
 695                                  &global_sid_Creator_Owner)) {
 696                 DEBUG(10, ("Map creator owner\n"));
 697                 ace_v4->who.special_id = SMB_ACE4_WHO_OWNER;
 698                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
 699                 /* A non inheriting creator owner entry has no effect. */
 700                 ace_v4->aceFlags |= SMB_ACE4_INHERIT_ONLY_ACE;
 701                 if (!(ace_v4->aceFlags & SMB_ACE4_DIRECTORY_INHERIT_ACE)
 702                     && !(ace_v4->aceFlags & SMB_ACE4_FILE_INHERIT_ACE)) {
 703                         return false;
 704                 }
 705         } else if (params->mode!=e_special &&
 706                    dom_sid_equal(&ace_nt->trustee,
 707                                  &global_sid_Creator_Group)) {
 708                 DEBUG(10, ("Map creator owner group\n"));
 709                 ace_v4->who.special_id = SMB_ACE4_WHO_GROUP;
 710                 ace_v4->flags |= SMB_ACE4_ID_SPECIAL;
 711                 /* A non inheriting creator group entry has no effect. */
 712                 ace_v4->aceFlags |= SMB_ACE4_INHERIT_ONLY_ACE;
 713                 if (!(ace_v4->aceFlags & SMB_ACE4_DIRECTORY_INHERIT_ACE)
 714                     && !(ace_v4->aceFlags & SMB_ACE4_FILE_INHERIT_ACE)) {
 715                         return false;
 716                 }
 717         } else {
 718                 uid_t uid;
 719                 gid_t gid;
 720
 721                 if (sid_to_gid(&ace_nt->trustee, &gid)) {
 722                         ace_v4->aceFlags |= SMB_ACE4_IDENTIFIER_GROUP;
 723                         ace_v4->who.gid = gid;
 724                 } else if (sid_to_uid(&ace_nt->trustee, &uid)) {
 725                         ace_v4->who.uid = uid;
 726                 } else if (dom_sid_compare_domain(&ace_nt->trustee,
 727                                                   &global_sid_Unix_NFS) == 0) {
 728                         return false;
 729                 } else {
 730                         DEBUG(1, ("nfs4_acls.c: file [%s]: could not "
 731                                   "convert %s to uid or gid\n",
 732                                   filename->base_name,
 733                                   sid_string_dbg(&ace_nt->trustee)));
 734                         return false;
 735                 }
 736         }
 737
 738         return true; /* OK */
 739 }
 740
 741 static int smbacl4_MergeIgnoreReject(
 742         enum smbacl4_acedup_enum acedup,
 743         struct SMB4ACL_T *theacl, /* may modify it */
 744         SMB_ACE4PROP_T *ace, /* the "new" ACE */
 745         bool    *paddNewACE,
 746         int     i
 747 )
 748 {
 749         int     result = 0;
 750         SMB_ACE4PROP_T *ace4found = smbacl4_find_equal_special(theacl, ace);
 751         if (ace4found)
 752         {
 753                 switch(acedup)
 754                 {
 755                 case e_merge: /* "merge" flags */
 756                         *paddNewACE = false;
 757                         ace4found->aceFlags |= ace->aceFlags;
 758                         ace4found->aceMask |= ace->aceMask;
 759                         break;
 760                 case e_ignore: /* leave out this record */
 761                         *paddNewACE = false;
 762                         break;
 763                 case e_reject: /* do an error */
 764                         DEBUG(8, ("ACL rejected by duplicate nt ace#%d\n", i));
 765                         errno = EINVAL; /* SHOULD be set on any _real_ error */
 766                         result = -1;
 767                         break;
 768                 default:
 769                         break;
 770                 }
 771         }
 772         return result;
 773 }
 774
 775 static int smbacl4_substitute_special(
 776         struct SMB4ACL_T *acl,
 777         uid_t ownerUID,
 778         gid_t ownerGID
 779 )
 780 {
 781         struct SMB4ACE_T *aceint;
 782
 783         for (aceint = acl->first; aceint != NULL; aceint = aceint->next) {
 784                 SMB_ACE4PROP_T *ace = &aceint->prop;
 785
 786                 DEBUG(10,("ace type: %d, iflags: %x, flags: %x, "
 787                           "mask: %x, who: %d\n",
 788                           ace->aceType, ace->flags, ace->aceFlags,
 789                           ace->aceMask, ace->who.id));
 790
 791                 if (!(ace->flags & SMB_ACE4_ID_SPECIAL) &&
 792                     !(ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP) &&
 793                     ace->who.uid == ownerUID) {
 794                         ace->flags |= SMB_ACE4_ID_SPECIAL;
 795                         ace->who.special_id = SMB_ACE4_WHO_OWNER;
 796                         DEBUG(10,("replaced with special owner ace\n"));
 797                 }
 798
 799                 if (!(ace->flags & SMB_ACE4_ID_SPECIAL) &&
 800                     ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP &&
 801                     ace->who.uid == ownerGID) {
 802                         ace->flags |= SMB_ACE4_ID_SPECIAL;
 803                         ace->who.special_id = SMB_ACE4_WHO_GROUP;
 804                         DEBUG(10,("replaced with special group ace\n"));
 805                 }
 806         }
 807         return true; /* OK */
 808 }
 809
 810 static int smbacl4_substitute_simple(
 811         struct SMB4ACL_T *acl,
 812         uid_t ownerUID,
 813         gid_t ownerGID
 814 )
 815 {
 816         struct SMB4ACE_T *aceint;
 817
 818         for (aceint = acl->first; aceint != NULL; aceint = aceint->next) {
 819                 SMB_ACE4PROP_T *ace = &aceint->prop;
 820
 821                 DEBUG(10,("ace type: %d, iflags: %x, flags: %x, "
 822                           "mask: %x, who: %d\n",
 823                           ace->aceType, ace->flags, ace->aceFlags,
 824                           ace->aceMask, ace->who.id));
 825
 826                 if (!(ace->flags & SMB_ACE4_ID_SPECIAL) &&
 827                     !(ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP) &&
 828                     ace->who.uid == ownerUID &&
 829                     !(ace->aceFlags & SMB_ACE4_INHERIT_ONLY_ACE) &&
 830                     !(ace->aceFlags & SMB_ACE4_FILE_INHERIT_ACE) &&
 831                     !(ace->aceFlags & SMB_ACE4_DIRECTORY_INHERIT_ACE)) {
 832                         ace->flags |= SMB_ACE4_ID_SPECIAL;
 833                         ace->who.special_id = SMB_ACE4_WHO_OWNER;
 834                         DEBUG(10,("replaced with special owner ace\n"));
 835                 }
 836
 837                 if (!(ace->flags & SMB_ACE4_ID_SPECIAL) &&
 838                     ace->aceFlags & SMB_ACE4_IDENTIFIER_GROUP &&
 839                     ace->who.uid == ownerGID &&
 840                     !(ace->aceFlags & SMB_ACE4_INHERIT_ONLY_ACE) &&
 841                     !(ace->aceFlags & SMB_ACE4_FILE_INHERIT_ACE) &&
 842                     !(ace->aceFlags & SMB_ACE4_DIRECTORY_INHERIT_ACE)) {
 843                         ace->flags |= SMB_ACE4_ID_SPECIAL;
 844                         ace->who.special_id = SMB_ACE4_WHO_GROUP;
 845                         DEBUG(10,("replaced with special group ace\n"));
 846                 }
 847         }
 848         return true; /* OK */
 849 }
 850
 851 static struct SMB4ACL_T *smbacl4_win2nfs4(
 852         TALLOC_CTX *mem_ctx,
 853         const files_struct *fsp,
 854         const struct security_acl *dacl,
 855         smbacl4_vfs_params *pparams,
 856         uid_t ownerUID,
 857         gid_t ownerGID
 858 )
 859 {
 860         struct SMB4ACL_T *theacl;
 861         uint32_t i;
 862         const char *filename = fsp->fsp_name->base_name;
 863
 864         DEBUG(10, ("smbacl4_win2nfs4 invoked\n"));
 865
 866         theacl = smb_create_smb4acl(mem_ctx);
 867         if (theacl==NULL)
 868                 return NULL;
 869
 870         for(i=0; i<dacl->num_aces; i++) {
 871                 SMB_ACE4PROP_T  ace_v4;
 872                 bool    addNewACE = true;
 873
 874                 if (!smbacl4_fill_ace4(fsp->fsp_name, pparams,
 875                                        ownerUID, ownerGID,
 876                                        dacl->aces + i, &ace_v4)) {
 877                         DEBUG(3, ("Could not fill ace for file %s, SID %s\n",
 878                                   filename,
 879                                   sid_string_dbg(&((dacl->aces+i)->trustee))));
 880                         continue;
 881                 }
 882
 883                 if (pparams->acedup!=e_dontcare) {
 884                         if (smbacl4_MergeIgnoreReject(pparams->acedup, theacl,
 885                                 &ace_v4, &addNewACE, i))
 886                                 return NULL;
 887                 }
 888
 889                 if (addNewACE)
 890                         smb_add_ace4(theacl, &ace_v4);
 891         }
 892
 893         if (pparams->mode==e_simple) {
 894                 smbacl4_substitute_simple(theacl, ownerUID, ownerGID);
 895         }
 896
 897         if (pparams->mode==e_special) {
 898                 smbacl4_substitute_special(theacl, ownerUID, ownerGID);
 899         }
 900
 901         return theacl;
 902 }
 903
 904 NTSTATUS smb_set_nt_acl_nfs4(vfs_handle_struct *handle, files_struct *fsp,
 905         uint32_t security_info_sent,
 906         const struct security_descriptor *psd,
 907         set_nfs4acl_native_fn_t set_nfs4_native)
 908 {
 909         smbacl4_vfs_params params;
 910         struct SMB4ACL_T *theacl = NULL;
 911         bool    result;
 912
 913         SMB_STRUCT_STAT sbuf;
 914         bool set_acl_as_root = false;
 915         uid_t newUID = (uid_t)-1;
 916         gid_t newGID = (gid_t)-1;
 917         int saved_errno;
 918         TALLOC_CTX *frame = talloc_stackframe();
 919
 920         DEBUG(10, ("smb_set_nt_acl_nfs4 invoked for %s\n", fsp_str_dbg(fsp)));
 921
 922         if ((security_info_sent & (SECINFO_DACL |
 923                 SECINFO_GROUP | SECINFO_OWNER)) == 0)
 924         {
 925                 DEBUG(9, ("security_info_sent (0x%x) ignored\n",
 926                         security_info_sent));
 927                 TALLOC_FREE(frame);
 928                 return NT_STATUS_OK; /* won't show error - later to be
 929                                       * refined... */
 930         }
 931
 932         /* Special behaviours */
 933         if (smbacl4_get_vfs_params(fsp->conn, &params)) {
 934                 TALLOC_FREE(frame);
 935                 return NT_STATUS_NO_MEMORY;
 936         }
 937
 938         if (smbacl4_fGetFileOwner(fsp, &sbuf)) {
 939                 TALLOC_FREE(frame);
 940                 return map_nt_error_from_unix(errno);
 941         }
 942
 943         if (params.do_chown) {
 944                 /* chown logic is a copy/paste from posix_acl.c:set_nt_acl */
 945                 NTSTATUS status = unpack_nt_owners(fsp->conn, &newUID, &newGID,
 946                                                    security_info_sent, psd);
 947                 if (!NT_STATUS_IS_OK(status)) {
 948                         DEBUG(8, ("unpack_nt_owners failed"));
 949                         TALLOC_FREE(frame);
 950                         return status;
 951                 }
 952                 if (((newUID != (uid_t)-1) && (sbuf.st_ex_uid != newUID)) ||
 953                     ((newGID != (gid_t)-1) && (sbuf.st_ex_gid != newGID))) {
 954
 955                         status = try_chown(fsp, newUID, newGID);
 956                         if (!NT_STATUS_IS_OK(status)) {
 957                                 DEBUG(3,("chown %s, %u, %u failed. Error = "
 958                                          "%s.\n", fsp_str_dbg(fsp),
 959                                          (unsigned int)newUID,
 960                                          (unsigned int)newGID,
 961                                          nt_errstr(status)));
 962                                 TALLOC_FREE(frame);
 963                                 return status;
 964                         }
 965
 966                         DEBUG(10,("chown %s, %u, %u succeeded.\n",
 967                                   fsp_str_dbg(fsp), (unsigned int)newUID,
 968                                   (unsigned int)newGID));
 969                         if (smbacl4_GetFileOwner(fsp->conn,
 970                                                  fsp->fsp_name->base_name,
 971                                                  &sbuf)){
 972                                 TALLOC_FREE(frame);
 973                                 return map_nt_error_from_unix(errno);
 974                         }
 975
 976                         /* If we successfully chowned, we know we must
 977                          * be able to set the acl, so do it as root.
 978                          */
 979                         set_acl_as_root = true;
 980                 }
 981         }
 982
 983         if (!(security_info_sent & SECINFO_DACL) || psd->dacl ==NULL) {
 984                 DEBUG(10, ("no dacl found; security_info_sent = 0x%x\n",
 985                            security_info_sent));
 986                 TALLOC_FREE(frame);
 987                 return NT_STATUS_OK;
 988         }
 989
 990         theacl = smbacl4_win2nfs4(frame, fsp, psd->dacl, &params,
 991                                   sbuf.st_ex_uid, sbuf.st_ex_gid);
 992         if (!theacl) {
 993                 TALLOC_FREE(frame);
 994                 return map_nt_error_from_unix(errno);
 995         }
 996
 997         smbacl4_set_controlflags(theacl, psd->type);
 998         smbacl4_dump_nfs4acl(10, theacl);
 999
1000         if (set_acl_as_root) {
1001                 become_root();
1002         }
1003         result = set_nfs4_native(handle, fsp, theacl);
1004         saved_errno = errno;
1005         if (set_acl_as_root) {
1006                 unbecome_root();
1007         }
1008
1009         TALLOC_FREE(frame);
1010
1011         if (result!=true) {
1012                 errno = saved_errno;
1013                 DEBUG(10, ("set_nfs4_native failed with %s\n",
1014                            strerror(errno)));
1015                 return map_nt_error_from_unix(errno);
1016         }
1017
1018         DEBUG(10, ("smb_set_nt_acl_nfs4 succeeded\n"));
1019         return NT_STATUS_OK;
1020 }