I recently did a CTF involving a file on a samba share which had a password in an alternate data stream. To read it I had to connect using Windows, but I'm curious if there's any way to read ADS from linux, either using SMBclient or another tool.
Reading Alternate Data Streams (ADS) is possible when using ntfs-3g:
NTFS stores all data in streams. Every file has exactly one unnamed data stream and can have many named data streams. The size of a file is the size of its unnamed data stream. By default, ntfs-3g will only read the unnamed data stream.
By using the options "streams_interface=windows", with the ntfs-3g driver (not possible with lowntfs-3g), you will be able to read any named data streams, simply by specifying the stream's name after a colon. For example:
Named data streams act like normal files, so you can read from them, write to them and even delete them (using rm). You can list all the named data streams a file has by getting the "ntfs.streams.list" extended attribute.