LDAPAccountManager/lam/docs/README.lamdaemon.txt

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Setting up lamdaemon:
Lamdaemon.pl is used to modify quota and home directories on a remote or local host via ssh.
If you want wo use it you have to set up some things to get it to work:
1. Setup values in LDAP Account Manager
* Set the remote or local host in the configuration
(e.g. 127.0.0.1)
* Path to lamdaemon.pl, e.g. /srv/www/htdocs/lam/lib/lamdaemon.pl
2. Set up sudo
The perl script has to run as root. Therefore we need
a wrapper, sudo.
Edit /etc/sudoers on host where homedirs or quotas should be used
and add the following line:
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$admin All= NOPASSWD: $path
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$admin is the adminuser from LAM and $path is the path to lamdaemon.pl
e.g. "$admin All= NOPASSWD: /srv/www/htdocs/lam/lib/lamdaemon.pl"
At the moment the password is a paramteter of lamdaemon.pl
therefore you should disable logging so the password does not
appear in any logfile.
This can be done by adding the following line to /etc/sudoers:
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Defaults:$admin !syslog
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3. Set up Perl
We need some external Perl modules, Quota and Net::SSH::Perl
To install them, run:
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perl -MCPAN -e shell
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install Quota # required
install Net::SSH::Perl # required
install Math::BigInt::GMP # optional but very poor performance if not installed
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If your Perl executable is not located in /usr/bin/perl you will have to edit
the path in the first line of lamdaemon.pl.
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If you have problems compiling the Perl modules try installing a newer release
of your GCC compiler and the "make" application.
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Debian users can install Net::SSH:Perl with dh-make-perl:
apt-get install dh-make-perl
dh-make-perl --build --cpan Net::SSH::Perl
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dpkg -i libnet-ssh-perl_1.25-1_all.deb
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4. Set up SSH
Your SSH daemon must offer the password authentication method.
To activate it just use this configuration option in /etc/ssh/sshd_config:
PasswordAuthentication yes
5. Test lamdaemon.pl
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There is a test-function in lamdaemon.pl. Please run lamdaemon.pl
with the following parameters to test it:
lamdaemon.pl $ssh-server $lam_path_on_host $admin-username $admin-password *test
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$ssh-server is the remote host lamdaemon.pl should be run on
$lam_path_on_host is the path to lamdaemon.pl on remote host
$admin-username is the name of the user which is allowed to run lamdaemon.pl
as root. It is the same user as in /etc/sudoers
$admin-password is the password of the admin user
*test is the command which tells lamdaemon.pl to test settings
You have to run the command as the user your webserver is running, e.g.
wwwrun@tilo:/srv/www/htdocs/lam/lib> /srv/www/htdocs/lam/lib/lamdaemon.pl \
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127.0.0.1 /srv/www/htdocs/lam/lib/lamdaemon.pl adminuser secret *test
You should get the following response:
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Net::SSH::Perl successfully installed.
Perl quota module successfully installed.
If you have not seen any error lamdaemon.pl should be set up successfully.
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!!! Attention !!!
Your password in LDAP has to be hashed with CRYPT. If you use something like SSHA
you will probably get "Access denied.".
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Now everything should work fine.
6. Debugging lamdaemon
If you set up all things as documented before and still get "Access denied"
then you can try to debug the problem.
- Check /var/log/auth.log or the equivalent on your system
This file contains messages about all logins. If the ssh login
failed then you will find a description about the reason here.
- Enable debug output in lamdaemon
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In line 235 of lamdaemon.pl change the SSH options like this:
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my $ssh = Net::SSH::Perl->new($hostname, options=>[
"UserKnownHostsFile /dev/null"],
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protocol => "2,1", debug => 1 );
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This will produce a lot of output when you do the lamdaemon test.
Check that there is a line like this:
Authentication methods that can continue: publickey,password,keyboard-interactive.
The "password" is the one which is important.
- Set sshd in debug mode
In /etc/ssh/sshd_conf add these lines:
SyslogFacility AUTH
LogLevel DEBUG3
Now check /var/log/syslog for messages from sshd.
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- Update Openssh
A Suse Linux user reported that upgrading Openssh solved the problem.
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Security warning:
-----------------
If you use PHP < 4.3 your admin user and password are passed as commandline argument.
This can be a security risk. Upgrade your PHP version for productive use.
Please send a mail to TiloLutz@gmx.de if you have any suggestions.