source3/modules/vfs_posixacl.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    VFS module to get and set posix acls
   4    Copyright (C) Volker Lendecke 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 "system/filesys.h"
  22 #include "smbd/smbd.h"
  23 #include "modules/vfs_posixacl.h"
  24
  25 /* prototypes for static functions first - for clarity */
  26
  27 static bool smb_ace_to_internal(acl_entry_t posix_ace,
  28                                 struct smb_acl_entry *ace);
  29 static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx);
  30 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm);
  31 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl);
  32
  33
  34 /* public functions - the api */
  35
  36 SMB_ACL_T posixacl_sys_acl_get_file(vfs_handle_struct *handle,
  37                                     const char *path_p,
  38                                     SMB_ACL_TYPE_T type,
  39                                     TALLOC_CTX *mem_ctx)
  40 {
  41         struct smb_acl_t *result;
  42         acl_type_t acl_type;
  43         acl_t acl;
  44
  45         switch(type) {
  46         case SMB_ACL_TYPE_ACCESS:
  47                 acl_type = ACL_TYPE_ACCESS;
  48                 break;
  49         case SMB_ACL_TYPE_DEFAULT:
  50                 acl_type = ACL_TYPE_DEFAULT;
  51                 break;
  52         default:
  53                 errno = EINVAL;
  54                 return NULL;
  55         }
  56
  57         acl = acl_get_file(path_p, acl_type);
  58
  59         if (acl == NULL) {
  60                 return NULL;
  61         }
  62
  63         result = smb_acl_to_internal(acl, mem_ctx);
  64         acl_free(acl);
  65         return result;
  66 }
  67
  68 SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle,
  69                                   files_struct *fsp, TALLOC_CTX *mem_ctx)
  70 {
  71         struct smb_acl_t *result;
  72         acl_t acl = acl_get_fd(fsp->fh->fd);
  73
  74         if (acl == NULL) {
  75                 return NULL;
  76         }
  77
  78         result = smb_acl_to_internal(acl, mem_ctx);
  79         acl_free(acl);
  80         return result;
  81 }
  82
  83 int posixacl_sys_acl_set_file(vfs_handle_struct *handle,
  84                               const char *name,
  85                               SMB_ACL_TYPE_T type,
  86                               SMB_ACL_T theacl)
  87 {
  88         int res;
  89         acl_type_t acl_type;
  90         acl_t acl;
  91
  92         DEBUG(10, ("Calling acl_set_file: %s, %d\n", name, type));
  93
  94         switch(type) {
  95         case SMB_ACL_TYPE_ACCESS:
  96                 acl_type = ACL_TYPE_ACCESS;
  97                 break;
  98         case SMB_ACL_TYPE_DEFAULT:
  99                 acl_type = ACL_TYPE_DEFAULT;
 100                 break;
 101         default:
 102                 errno = EINVAL;
 103                 return -1;
 104         }
 105
 106         if ((acl = smb_acl_to_posix(theacl)) == NULL) {
 107                 return -1;
 108         }
 109         res = acl_set_file(name, acl_type, acl);
 110         if (res != 0) {
 111                 DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno)));
 112         }
 113         acl_free(acl);
 114         return res;
 115 }
 116
 117 int posixacl_sys_acl_set_fd(vfs_handle_struct *handle,
 118                             files_struct *fsp,
 119                             SMB_ACL_T theacl)
 120 {
 121         int res;
 122         acl_t acl = smb_acl_to_posix(theacl);
 123         if (acl == NULL) {
 124                 return -1;
 125         }
 126         res =  acl_set_fd(fsp->fh->fd, acl);
 127         acl_free(acl);
 128         return res;
 129 }
 130
 131 int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
 132                                      const char *path)
 133 {
 134         return acl_delete_def_file(path);
 135 }
 136
 137
 138 /* private functions */
 139
 140 static bool smb_ace_to_internal(acl_entry_t posix_ace,
 141                                 struct smb_acl_entry *ace)
 142 {
 143         acl_tag_t tag;
 144         acl_permset_t permset;
 145
 146         if (acl_get_tag_type(posix_ace, &tag) != 0) {
 147                 DEBUG(0, ("smb_acl_get_tag_type failed\n"));
 148                 return False;
 149         }
 150
 151         switch(tag) {
 152         case ACL_USER:
 153                 ace->a_type = SMB_ACL_USER;
 154                 break;
 155         case ACL_USER_OBJ:
 156                 ace->a_type = SMB_ACL_USER_OBJ;
 157                 break;
 158         case ACL_GROUP:
 159                 ace->a_type = SMB_ACL_GROUP;
 160                 break;
 161         case ACL_GROUP_OBJ:
 162                 ace->a_type = SMB_ACL_GROUP_OBJ;
 163                 break;
 164         case ACL_OTHER:
 165                 ace->a_type = SMB_ACL_OTHER;
 166                 break;
 167         case ACL_MASK:
 168                 ace->a_type = SMB_ACL_MASK;
 169                 break;
 170         default:
 171                 DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag));
 172                 return False;
 173         }
 174         switch(ace->a_type) {
 175         case SMB_ACL_USER: {
 176                 uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace);
 177                 if (puid == NULL) {
 178                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 179                         return False;
 180                 }
 181                 ace->info.user.uid = *puid;
 182                 acl_free(puid);
 183                 break;
 184         }
 185
 186         case SMB_ACL_GROUP: {
 187                 gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace);
 188                 if (pgid == NULL) {
 189                         DEBUG(0, ("smb_acl_get_qualifier failed\n"));
 190                         return False;
 191                 }
 192                 ace->info.group.gid = *pgid;
 193                 acl_free(pgid);
 194                 break;
 195         }
 196         default:
 197                 break;
 198         }
 199         if (acl_get_permset(posix_ace, &permset) != 0) {
 200                 DEBUG(0, ("smb_acl_get_mode failed\n"));
 201                 return False;
 202         }
 203         ace->a_perm = 0;
 204 #ifdef HAVE_ACL_GET_PERM_NP
 205         ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0);
 206         ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 207         ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 208 #else
 209         ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
 210         ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
 211         ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
 212 #endif
 213         return True;
 214 }
 215
 216 static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx)
 217 {
 218         struct smb_acl_t *result = sys_acl_init(mem_ctx);
 219         int entry_id = ACL_FIRST_ENTRY;
 220         acl_entry_t e;
 221         if (result == NULL) {
 222                 return NULL;
 223         }
 224         while (acl_get_entry(acl, entry_id, &e) == 1) {
 225
 226                 entry_id = ACL_NEXT_ENTRY;
 227
 228                 result->acl = talloc_realloc(result, result->acl,
 229                                              struct smb_acl_entry, result->count+1);
 230                 if (result->acl == NULL) {
 231                         TALLOC_FREE(result);
 232                         DEBUG(0, ("talloc_realloc failed\n"));
 233                         errno = ENOMEM;
 234                         return NULL;
 235                 }
 236
 237                 if (!smb_ace_to_internal(e, &result->acl[result->count])) {
 238                         TALLOC_FREE(result);
 239                         return NULL;
 240                 }
 241
 242                 result->count += 1;
 243         }
 244         return result;
 245 }
 246
 247 static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm)
 248 {
 249         int ret;
 250         acl_permset_t permset;
 251
 252         if ((ret = acl_get_permset(entry, &permset)) != 0) {
 253                 return ret;
 254         }
 255         if ((ret = acl_clear_perms(permset)) != 0) {
 256                 return ret;
 257         }
 258         if ((perm & SMB_ACL_READ) &&
 259             ((ret = acl_add_perm(permset, ACL_READ)) != 0)) {
 260                 return ret;
 261         }
 262         if ((perm & SMB_ACL_WRITE) &&
 263             ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) {
 264                 return ret;
 265         }
 266         if ((perm & SMB_ACL_EXECUTE) &&
 267             ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) {
 268                 return ret;
 269         }
 270         return acl_set_permset(entry, permset);
 271 }
 272
 273 static acl_t smb_acl_to_posix(const struct smb_acl_t *acl)
 274 {
 275         acl_t result;
 276         int i;
 277
 278         result = acl_init(acl->count);
 279         if (result == NULL) {
 280                 DEBUG(10, ("acl_init failed\n"));
 281                 return NULL;
 282         }
 283
 284         for (i=0; i<acl->count; i++) {
 285                 const struct smb_acl_entry *entry = &acl->acl[i];
 286                 acl_entry_t e;
 287                 acl_tag_t tag;
 288
 289                 if (acl_create_entry(&result, &e) != 0) {
 290                         DEBUG(1, ("acl_create_entry failed: %s\n",
 291                                   strerror(errno)));
 292                         goto fail;
 293                 }
 294
 295                 switch (entry->a_type) {
 296                 case SMB_ACL_USER:
 297                         tag = ACL_USER;
 298                         break;
 299                 case SMB_ACL_USER_OBJ:
 300                         tag = ACL_USER_OBJ;
 301                         break;
 302                 case SMB_ACL_GROUP:
 303                         tag = ACL_GROUP;
 304                         break;
 305                 case SMB_ACL_GROUP_OBJ:
 306                         tag = ACL_GROUP_OBJ;
 307                         break;
 308                 case SMB_ACL_OTHER:
 309                         tag = ACL_OTHER;
 310                         break;
 311                 case SMB_ACL_MASK:
 312                         tag = ACL_MASK;
 313                         break;
 314                 default:
 315                         DEBUG(1, ("Unknown tag value %d\n", entry->a_type));
 316                         goto fail;
 317                 }
 318
 319                 if (acl_set_tag_type(e, tag) != 0) {
 320                         DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n",
 321                                    tag, strerror(errno)));
 322                         goto fail;
 323                 }
 324
 325                 switch (entry->a_type) {
 326                 case SMB_ACL_USER:
 327                         if (acl_set_qualifier(e, &entry->info.user.uid) != 0) {
 328                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 329                                           strerror(errno)));
 330                                 goto fail;
 331                         }
 332                         break;
 333                 case SMB_ACL_GROUP:
 334                         if (acl_set_qualifier(e, &entry->info.group.gid) != 0) {
 335                                 DEBUG(1, ("acl_set_qualifiier failed: %s\n",
 336                                           strerror(errno)));
 337                                 goto fail;
 338                         }
 339                         break;
 340                 default:        /* Shut up, compiler! :-) */
 341                         break;
 342                 }
 343
 344                 if (smb_acl_set_mode(e, entry->a_perm) != 0) {
 345                         goto fail;
 346                 }
 347         }
 348
 349         if (acl_valid(result) != 0) {
 350                 char *acl_string = sys_acl_to_text(acl, NULL);
 351                 DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n",
 352                           acl_string, strerror(errno)));
 353                 SAFE_FREE(acl_string);
 354                 goto fail;
 355         }
 356
 357         return result;
 358
 359  fail:
 360         if (result != NULL) {
 361                 acl_free(result);
 362         }
 363         return NULL;
 364 }
 365
 366 /* VFS operations structure */
 367
 368 static struct vfs_fn_pointers posixacl_fns = {
 369         .sys_acl_get_file_fn = posixacl_sys_acl_get_file,
 370         .sys_acl_get_fd_fn = posixacl_sys_acl_get_fd,
 371         .sys_acl_set_file_fn = posixacl_sys_acl_set_file,
 372         .sys_acl_set_fd_fn = posixacl_sys_acl_set_fd,
 373         .sys_acl_delete_def_file_fn = posixacl_sys_acl_delete_def_file,
 374 };
 375
 376 NTSTATUS vfs_posixacl_init(void);
 377 NTSTATUS vfs_posixacl_init(void)
 378 {
 379         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
 380                                 &posixacl_fns);
 381 }