File type specifications
PDF
Specification Validated Against:
- PDF Reference (third edition) Adobe Portable Document Format Version 1.7.
Note: Glasswall supports PDF Reference (third edition) Adobe Portable Document Format from Version 1.3.
Images
There are no content management switches for any of the image file formats. Images embedded in a document that do not conform to the specification will result in the original document being quarantined.
JPEG
Specification Validated Against:
- JPEG File Interchange Format, Version 1.02 September 1, 1992
- JP2 for ISO/IEC 15444-1 (JPEG 2000)
- JPX for ISO/IEC 15444-2 (JPEG 2000)
GIF
Specification Validated Against:
- Graphics Interchange Format, Version GIF 87a
- Graphics Interchange Format, Version GIF 89a
PNG
Specification Validated Against:
- Portable Network Graphics (PNG): Functional specification. ISO/IEC 15948:2003 (E)
EMF
Specification Validated Against:
- [MS-EMF]: Enhanced Metafile Format: Open Specifications Documentation. v20151016
- [MS-EMFPLUS]: Enhanced Metafile Format Plus Extensions: Open Specifications Documentation. V20121017
WMF
Specification Validated Against:
- [MS-WMF]: Windows Metafile Format: Open Specifications Documentation. v20121017
TIFF and GeoTIFF
Specification Validated Against:
- TIFF 6.0 Specification: Final – June 3, 1992
- GeoTIFF Format Specification - Specification Version: 1.8.1
BMP
Specification Validated Against:
- BMP is covered by the WMF file specification.
Binary Office
Processing specific to Binary Office in Protect mode
- The content management switch
GWFILE_MANAGE_REMOVE_MACROSwhen set to sanitise in Protect mode removes the VBA script from the regenerated file but copies over the macro container. This can give the impression that the macros have not been deleted. - The content management switch
GWFILE_MANAGE_REMOVE_EMBEDDED_FILESwhen set to sanitise in Protect mode follows these rules:- If the embedded file is supported by Glasswall, it will be processed as a standalone file, including its own configuration management policies. If it can be regenerated, it will be re-embedded; otherwise, the parent file will be marked as non-conforming.
- If the embedded file is not supported (e.g., .mdb or .dat files), it will be removed.
- Embedded files are validated to five levels deep.
DOC
Specifications Validated Against:
- [MS-DOC]: Word (.doc) Binary File Format - Microsoft Corporation, 2011, v20121003 to [MS-DOC]: Word (.doc) Binary File Format - Corporation, 2017, v20170112
- Office Common Data Types and Objects Structure Specification - Microsoft Corporation, 2011, v20110608
- Office Document Cryptography Structure Specification - Microsoft Corporation, 2011, v20110608
- Office VBA File Format Structure Specification - Microsoft Corporation, 2011, v20110608
Non-Supported Specifications:
- Word 95 and earlier versions (Word 1 to Word 6) are not supported. Processing these file types will result in an issue being reported in the XML report in Analysis mode and the file not being regenerated in Protect mode.
- Word files containing Apple Mac or LibreOffice-specific file features will be marked as non-conformant.
XLS
Specifications Validated Against:
- [MS-XLS]: Excel Binary File Format (.xls) Structure Specification - Microsoft Corporation, v20141018 to v20161017.
- Spreadsheet Data Model File Format
- Office Graph Binary File Format v20141019
Non-Supported Specifications:
- Excel 95 and earlier versions are not supported. Processing these file types will result in an issue being reported in the XML report in Analysis mode and the file not being regenerated in Protect mode.
- Excel files containing Apple Mac or LibreOffice-specific file features will be marked as non-conformant.
PPT
Specifications Validated Against:
- [MS-PPT]: PowerPoint (.ppt) Binary File Format - Microsoft Corporation, v20121003 to v20160922.
Non-Supported Specifications:
- PowerPoint 95 and earlier versions are not supported. Processing these file types will result in an issue being reported in the XML report in Analysis mode and the file not being regenerated in Protect mode.
- PowerPoint files containing Apple Mac or LibreOffice-specific file features will be marked as non-conformant.
XML Office
Processing specific to XML Office in Protect mode
- If an XML Office file has another XML Office file embedded inside it and the
GWFILE_MANAGE_REMOVE_EMBEDDED_FILESis set to sanitise, the embedded file will be removed when a new file is regenerated. - Office XML files are stored as zipped archives. If the zipped file is less than 10MB, when extracted, an individual stream exceeding 10MB:
- 32-bit DLL: The file is marked as non-conforming and will not be processed further.
- 64-bit DLL: Streams up to 50MB are processed.
Office 2010
Specifications Validated Against:
- ECMA-376 5th edition Part 1
- ECMA-376 5th edition Part 2
- ECMA-376 5th edition Part 3
- ECMA-376 5th edition Part 4
Office 2013
Specifications Validated Against:
- Word (.docx) Extensions to the Office Open XML SpreadsheetML File Format
- Excel (.xlsx) Extensions to the Office Open XML SpreadsheetML File Format
- PowerPoint (.pptx) Extensions to the Office Open XML SpreadsheetML File Format
- Office Drawing Extensions to the Office Open XML Structure
Non-Supported Specifications:
- Office 2010 or Office 2013 files containing Apple Mac or LibreOffice-specific file features may be marked as non-conformant or the components may be removed from the file.
Other
WAV
Specifications Validated Against:
- Multimedia Programming Interface and Data Specifications 1.0 August 1991.
MPG
Specifications Validated Against:
- ISO/IEC 13818-1:2000(E). Second edition 2000-12-01
MP3
Specifications Validated Against:
- MPEG Layer III audio encoding is defined in two ISO/IEC specification families:
- MPEG-1: ISO/IEC 11172-3
- MPEG-2: ISO/IEC 13818-3
MP4
Specifications Validated Against:
- ISO/IEC 14496-12:2005(E). Part 12: Corrected version 2005-10-01.
PE and COFF
Specifications Validated Against:
- Microsoft Portable Executable and Common Object File Format Specification Revision 6.0 – February 1999.
ELF
Specifications Validated Against:
- Tool Interface Standard (TIS) Executable and Linking Format (ELF) Specification Version 1.2. May 1995
- ELF-64 Object File Format Version 1.2 Draft 2. May 27, 1998.
Mach-O
Specifications Validated Against:
- OS X ABI Mach-O File Format Reference. 2009-02-04.