/* Unix SMB/Netbios implementation. VFS module to get and set posix acls Copyright (C) Volker Lendecke 2006 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "system/filesys.h" #include "smbd/smbd.h" #include "modules/vfs_posixacl.h" /* prototypes for static functions first - for clarity */ static bool smb_ace_to_internal(acl_entry_t posix_ace, struct smb_acl_entry *ace); static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx); static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm); static acl_t smb_acl_to_posix(const struct smb_acl_t *acl); /* public functions - the api */ SMB_ACL_T posixacl_sys_acl_get_file(vfs_handle_struct *handle, const char *path_p, SMB_ACL_TYPE_T type, TALLOC_CTX *mem_ctx) { struct smb_acl_t *result; acl_type_t acl_type; acl_t acl; switch(type) { case SMB_ACL_TYPE_ACCESS: acl_type = ACL_TYPE_ACCESS; break; case SMB_ACL_TYPE_DEFAULT: acl_type = ACL_TYPE_DEFAULT; break; default: errno = EINVAL; return NULL; } acl = acl_get_file(path_p, acl_type); if (acl == NULL) { return NULL; } result = smb_acl_to_internal(acl, mem_ctx); acl_free(acl); return result; } SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx) { struct smb_acl_t *result; acl_t acl = acl_get_fd(fsp->fh->fd); if (acl == NULL) { return NULL; } result = smb_acl_to_internal(acl, mem_ctx); acl_free(acl); return result; } int posixacl_sys_acl_set_file(vfs_handle_struct *handle, const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T theacl) { int res; acl_type_t acl_type; acl_t acl; DEBUG(10, ("Calling acl_set_file: %s, %d\n", name, type)); switch(type) { case SMB_ACL_TYPE_ACCESS: acl_type = ACL_TYPE_ACCESS; break; case SMB_ACL_TYPE_DEFAULT: acl_type = ACL_TYPE_DEFAULT; break; default: errno = EINVAL; return -1; } if ((acl = smb_acl_to_posix(theacl)) == NULL) { return -1; } res = acl_set_file(name, acl_type, acl); if (res != 0) { DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno))); } acl_free(acl); return res; } int posixacl_sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp, SMB_ACL_T theacl) { int res; acl_t acl = smb_acl_to_posix(theacl); if (acl == NULL) { return -1; } res = acl_set_fd(fsp->fh->fd, acl); acl_free(acl); return res; } int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle, const char *path) { return acl_delete_def_file(path); } /* private functions */ static bool smb_ace_to_internal(acl_entry_t posix_ace, struct smb_acl_entry *ace) { acl_tag_t tag; acl_permset_t permset; if (acl_get_tag_type(posix_ace, &tag) != 0) { DEBUG(0, ("smb_acl_get_tag_type failed\n")); return False; } switch(tag) { case ACL_USER: ace->a_type = SMB_ACL_USER; break; case ACL_USER_OBJ: ace->a_type = SMB_ACL_USER_OBJ; break; case ACL_GROUP: ace->a_type = SMB_ACL_GROUP; break; case ACL_GROUP_OBJ: ace->a_type = SMB_ACL_GROUP_OBJ; break; case ACL_OTHER: ace->a_type = SMB_ACL_OTHER; break; case ACL_MASK: ace->a_type = SMB_ACL_MASK; break; default: DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag)); return False; } switch(ace->a_type) { case SMB_ACL_USER: { uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace); if (puid == NULL) { DEBUG(0, ("smb_acl_get_qualifier failed\n")); return False; } ace->info.user.uid = *puid; acl_free(puid); break; } case SMB_ACL_GROUP: { gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace); if (pgid == NULL) { DEBUG(0, ("smb_acl_get_qualifier failed\n")); return False; } ace->info.group.gid = *pgid; acl_free(pgid); break; } default: break; } if (acl_get_permset(posix_ace, &permset) != 0) { DEBUG(0, ("smb_acl_get_mode failed\n")); return False; } ace->a_perm = 0; #ifdef HAVE_ACL_GET_PERM_NP ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0); ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0); ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0); #else ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0); ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0); ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0); #endif return True; } static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx) { struct smb_acl_t *result = sys_acl_init(mem_ctx); int entry_id = ACL_FIRST_ENTRY; acl_entry_t e; if (result == NULL) { return NULL; } while (acl_get_entry(acl, entry_id, &e) == 1) { entry_id = ACL_NEXT_ENTRY; result->acl = talloc_realloc(result, result->acl, struct smb_acl_entry, result->count+1); if (result->acl == NULL) { TALLOC_FREE(result); DEBUG(0, ("talloc_realloc failed\n")); errno = ENOMEM; return NULL; } if (!smb_ace_to_internal(e, &result->acl[result->count])) { TALLOC_FREE(result); return NULL; } result->count += 1; } return result; } static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm) { int ret; acl_permset_t permset; if ((ret = acl_get_permset(entry, &permset)) != 0) { return ret; } if ((ret = acl_clear_perms(permset)) != 0) { return ret; } if ((perm & SMB_ACL_READ) && ((ret = acl_add_perm(permset, ACL_READ)) != 0)) { return ret; } if ((perm & SMB_ACL_WRITE) && ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) { return ret; } if ((perm & SMB_ACL_EXECUTE) && ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) { return ret; } return acl_set_permset(entry, permset); } static acl_t smb_acl_to_posix(const struct smb_acl_t *acl) { acl_t result; int i; result = acl_init(acl->count); if (result == NULL) { DEBUG(10, ("acl_init failed\n")); return NULL; } for (i=0; i<acl->count; i++) { const struct smb_acl_entry *entry = &acl->acl[i]; acl_entry_t e; acl_tag_t tag; if (acl_create_entry(&result, &e) != 0) { DEBUG(1, ("acl_create_entry failed: %s\n", strerror(errno))); goto fail; } switch (entry->a_type) { case SMB_ACL_USER: tag = ACL_USER; break; case SMB_ACL_USER_OBJ: tag = ACL_USER_OBJ; break; case SMB_ACL_GROUP: tag = ACL_GROUP; break; case SMB_ACL_GROUP_OBJ: tag = ACL_GROUP_OBJ; break; case SMB_ACL_OTHER: tag = ACL_OTHER; break; case SMB_ACL_MASK: tag = ACL_MASK; break; default: DEBUG(1, ("Unknown tag value %d\n", entry->a_type)); goto fail; } if (acl_set_tag_type(e, tag) != 0) { DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n", tag, strerror(errno))); goto fail; } switch (entry->a_type) { case SMB_ACL_USER: if (acl_set_qualifier(e, &entry->info.user.uid) != 0) { DEBUG(1, ("acl_set_qualifiier failed: %s\n", strerror(errno))); goto fail; } break; case SMB_ACL_GROUP: if (acl_set_qualifier(e, &entry->info.group.gid) != 0) { DEBUG(1, ("acl_set_qualifiier failed: %s\n", strerror(errno))); goto fail; } break; default: /* Shut up, compiler! :-) */ break; } if (smb_acl_set_mode(e, entry->a_perm) != 0) { goto fail; } } if (acl_valid(result) != 0) { char *acl_string = sys_acl_to_text(acl, NULL); DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n", acl_string, strerror(errno))); SAFE_FREE(acl_string); goto fail; } return result; fail: if (result != NULL) { acl_free(result); } return NULL; } /* VFS operations structure */ static struct vfs_fn_pointers posixacl_fns = { .sys_acl_get_file_fn = posixacl_sys_acl_get_file, .sys_acl_get_fd_fn = posixacl_sys_acl_get_fd, .sys_acl_blob_get_file_fn = posix_sys_acl_blob_get_file, .sys_acl_blob_get_fd_fn = posix_sys_acl_blob_get_fd, .sys_acl_set_file_fn = posixacl_sys_acl_set_file, .sys_acl_set_fd_fn = posixacl_sys_acl_set_fd, .sys_acl_delete_def_file_fn = posixacl_sys_acl_delete_def_file, }; NTSTATUS vfs_posixacl_init(void); NTSTATUS vfs_posixacl_init(void) { return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl", &posixacl_fns); }