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Top Forums Shell Programming and Scripting Execution problem unix commands in Perl CGI Post 302588017 by Corona688 on Friday 6th of January 2012 01:54:23 PM
Old 01-06-2012
Good.

ssh uses your ~/.ssh/id_rsa file to log in without a password. The server you want into compares that with a key you gave it. ssh is extremely particular about who is allowed to read this file -- for your webserver to use it, it needs its own copy that belongs to it and can't be read by anybody else. If it thinks the security is lax enough for the key to be stolen, ssh will refuse to operate passwordlessly.

In a root terminal, do this once:

Code:
# Create a safe place for apache to get the key.
mkdir /etc/apache-key
# Make sure it belongs to the web server.
chown apache:apache /etc/apache-key
# Copy the key.
cp /home/username/.ssh/id_rsa /etc/apache-key
# Make it belong to apache and nobody else.
chown apache:apache /etc/apache-key/id_rsa
# Make sure ONLY the apache can read it.
chmod 0400 /etc/apache-key/id_rsa
# Make sure ONLY apache can even get in.
chmod 0700 /etc/apache-key

It might be id_dsa instead of id_rsa, but dsa keys are old now.

Then, in your cgi script, you would run ssh -i /etc/apache-key/id_rsa username@host ls /dir/ and, if everything's where it belongs and has the right permissions, ssh should be able to get in without a password.
 

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SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine and append the indicated identity file to that machine's ~/.ssh/autho- rized_keys file. If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary.) NOTES
This program does not modify the permissions of any pre-existing files or directories. Therefore, if the remote sshd has StrictModes set in its configuration, then the user's home, ~/.ssh folder, and ~/.ssh/authorized_keys file may need to have group writability disabled manu- ally, e.g. via chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys on the remote machine. SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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