mount passwdfd option with encripted partition or file

crions · 01-31-2006, 06:40 PM

Dear Folks,

I´ve have just made one encrypted file (aes encryption) using cryptoloop and aes. Working perfectly. Regardless the style used here "loop-aes", "cryptoloop", "dm-crypt", they allways hit a losetup, loop and mount point.

Here is my problem

I need to mount "automaticaly" one encrypted partition, the password will be located in a file at a remote server over the web.
A script will capture that file/password and mount it.

Code:

mount -o loop,encryption=aes -p ? cryptfile /mnt/temporary/

There is the passwdfd option that I REALLY HAVE NO IDEA HOW IT WORKS! No good examples found in GOOGLE and no IDEA what is a "read the passphrase from file descriptor" Witch file? How to set it up?. MAN pages about this particular item (mount,loop,losetup)are not elucidative. Also I have no idea

if the password can be forwarded / passed / send in another way to mount command.

The thing is: I need to mount it without typing anything.

P.S: I need to do this way, don´t tell me "type the password" or related stuff, please.
My OS: Slackware 10.2 with 2.6.13 Kernel
Using modules: cryptoloop and aes

crions · 02-01-2006, 04:35 AM

Replying to myself... After 5 hour sleep time.

Code:

cat filepasshere | mount -o loop,encryption=aes -p 0 /mnt/crypt/cryptfile /mnt/tempo/

I hope this helps anyone in the future.
Alternative methods and post are welcome.
Also better examples for passwdfd option.