From 2004317c09d781a4ec1275aaa4a29289e798eff3 Mon Sep 17 00:00:00 2001 From: Volker Lendecke Date: Wed, 20 Nov 2013 12:09:47 +0100 Subject: s3-modules: add new vfs_worm module VFS module to disallow writes for older files. Signed-off-by: Volker Lendecke Reviewed-by: Stefan Metzmacher Reviewed-by: Jeremy Allison --- source3/modules/vfs_worm.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100644 source3/modules/vfs_worm.c diff --git a/source3/modules/vfs_worm.c b/source3/modules/vfs_worm.c new file mode 100644 index 00000000000..77a18cad379 --- /dev/null +++ b/source3/modules/vfs_worm.c @@ -0,0 +1,97 @@ +/* + * VFS module to disallow writes for older files + * + * Copyright (C) 2013, Volker Lendecke + * + * 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 . + */ + +#include "includes.h" +#include "smbd/smbd.h" +#include "system/filesys.h" +#include "libcli/security/security.h" + +static NTSTATUS vfs_worm_create_file(vfs_handle_struct *handle, + struct smb_request *req, + uint16_t root_dir_fid, + struct smb_filename *smb_fname, + uint32_t access_mask, + uint32_t share_access, + uint32_t create_disposition, + uint32_t create_options, + uint32_t file_attributes, + uint32_t oplock_request, + uint64_t allocation_size, + uint32_t private_flags, + struct security_descriptor *sd, + struct ea_list *ea_list, + files_struct **result, + int *pinfo) +{ + bool readonly = false; + const uint32_t write_access_flags = + FILE_WRITE_DATA | FILE_APPEND_DATA | + FILE_WRITE_ATTRIBUTES | DELETE_ACCESS | + WRITE_DAC_ACCESS | WRITE_OWNER_ACCESS; + NTSTATUS status; + + if (VALID_STAT(smb_fname->st)) { + double age; + age = timespec_elapsed(&smb_fname->st.st_ex_ctime); + if (age > lp_parm_int(SNUM(handle->conn), "worm", + "grace_period", 3600)) { + readonly = true; + } + } + + if (readonly && (access_mask & write_access_flags)) { + return NT_STATUS_ACCESS_DENIED; + } + + status = SMB_VFS_NEXT_CREATE_FILE( + handle, req, root_dir_fid, smb_fname, access_mask, + share_access, create_disposition, create_options, + file_attributes, oplock_request, allocation_size, + private_flags, sd, ea_list, result, pinfo); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + /* + * Access via MAXIMUM_ALLOWED_ACCESS? + */ + if (readonly && ((*result)->access_mask & write_access_flags)) { + close_file(req, *result, NORMAL_CLOSE); + return NT_STATUS_ACCESS_DENIED; + } + return NT_STATUS_OK; +} + +static struct vfs_fn_pointers vfs_worm_fns = { + .create_file_fn = vfs_worm_create_file, +}; + +NTSTATUS vfs_worm_init(void); +NTSTATUS vfs_worm_init(void) +{ + NTSTATUS ret; + + ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "worm", + &vfs_worm_fns); + if (!NT_STATUS_IS_OK(ret)) { + return ret; + } + + return ret; +} -- cgit