Difference between revisions of "Port 9100 printing"

Raw printing is what we define as the process of making a connection to port 9100/tcp of a network printer – a functionality which was originally introduced by HP in the early 90s using separate hardware modules. It is the default method used by ''CUPS'' and the ''Windows printing architecture'' <ref>''[https://msdn.microsoft.com/windows/hardware/drivers/print/printer-driver-architecture Windows Printer Driver Architecture]'', Microsoft Corporation</ref> to communicate with network printers as it is considered as `the simplest, fastest, and generally the most reliable network protocol used for printers' <ref>''[https://www.cups.org/doc/network.html\#PROTOCOLS Network Protocols supported by CUPS – AppSocket Protocol]'', M. Sweet</ref>. Raw port 9100 printing, also referred to as ''JetDirect'', ''AppSocket'' or ''PDL-datastream'' actually is not a printing protocol by itself. Instead all data sent is directly processed by the printing device, just like a parallel connection over TCP. In contrast to [[LPD]], [[IPP]] and [[SMB]] interpreted [[Fundamentals#Printer Control Languages|printer control]] or [[Fundamentals#Page Description Languages|page description]] languages can send direct feedback to the client, including status and error messages. Such a '''bidirectional channel''' is not only perfect for debugging, but gives us direct access to results of PJL, PostScript or PCL commands, for example for [information disclosure] attacks. Therefore raw port 9100 printing – which is supported by almost any network printer – is used as the channel for security analysis with [[PRET]] and [[PFT]].

Raw printing is what we define as the process of making a connection to port 9100/tcp of a network printer – a functionality which was originally introduced by HP in the early 90s using separate hardware modules. It is the default method used by ''CUPS'' and the ''Windows printing architecture'' <ref>''[https://msdn.microsoft.com/windows/hardware/drivers/print/printer-driver-architecture Windows Printer Driver Architecture]'', Microsoft Corporation</ref> to communicate with network printers as it is considered as `the simplest, fastest, and generally the most reliable network protocol used for printers' <ref>''[https://www.cups.org/doc/network.html\#PROTOCOLS Network Protocols supported by CUPS – AppSocket Protocol]'', M. Sweet</ref>. Raw port 9100 printing, also referred to as ''JetDirect'', ''AppSocket'' or ''PDL-datastream'' actually is not a printing protocol by itself. Instead all data sent is directly processed by the printing device, just like a parallel connection over TCP. In contrast to [[LPD]], [[IPP]] and [[SMB]] interpreted [[Fundamentals#Printer Control Languages|printer control]] or [[Fundamentals#Page Description Languages|page description]] languages can send direct feedback to the client, including status and error messages. Such a '''bidirectional channel''' is not only perfect for debugging, but gives us direct access to results of PJL, PostScript or PCL commands, for example for [information disclosure] attacks. Therefore raw port 9100 printing – which is supported by almost any network printer – is used as the channel for security analysis with [[PRET]] and [[PFT]].