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Through City Linux I am able to provide rapid on-site support in Beeston, Chesterfield, Derby, Grantham, Ilkeston, Leicester, Lichfield, Lincoln, Long Eaton, Loughborough, Leicester, Mansfield, Market Harborough, Milton Keynes, Newark, Newport Pagnell, Oldham, Retford, Ripley, Sheffield, Sutton Ashfield and Stoke on Trent.
I can support Linux servers remotely and in the cloud anywhere in the world, including 1&1 servers in Germany and the USA.
Symetric encryption on a remote host without exposing thepassphrase.
I am rather surprised that this isn’t such a common requirement that solutions are all over the net, but they arn’t, or if they are, I can’t find them.
What I needed to do was create a zipped archive on a remote server and then encrypt the archive before transferring it to a 1and1 repository.
Everything I found on the net recommend using the --passphrase-fd option or --passphrase like this
echo <passphrase>|gpg -c --batch --passphrase-fd 0 <filename> or gpg -c --batch --passphrase <passphrase> <filename>
The problem is of course that the passphrase then shows up in ps and as this is a pretty large file I’m handling is visible for an hour or more. NB the --batch option is necessary or gpg gets twitchy about the lack of a terminal.
The solution I’ve adopted is to create a file containing the passphrase on the remote box, use the file to carry out the encryption and then delete it.
cat <passphrase_file>|ssh <host> "sudo dd of=<filename>;\ gpg -c -batch --passphrase-fn "
Clifford W Fulford
6 May 2014.
I have been designing, building and administering IT systems for some
of the worlds top companies for over 30 years. Using LINUX I can
provide customers with the strength and stability of UNIX systems
at a fraction of the cost.
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© 2003-2018
Clifford W Fulford.
Fulford Consulting Ltd.
Regd. Co. 4250037 in England & Wales.
Regd. office 162, Edward Rd. Nottingham NG2 5GF, England, UK.
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