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Old 11-07-2012, 08:08 PM   #31
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if you are INSISTANT in using email (despite all these lovely peoples warnings)
your answer lies within the magic of procmail

one can quite easily accept 'commands' in the form of message body, providing the subject line contains $(something secret or keywords) and is only received from a particular email address ** can be forged easily, so make use of the full headers for validation checks.

have fun testing, but dont make it live on a production server. email is inherently insecure, in many many ways.
We used to use this procmail method to open a reverse ssh tunnel back into the office many years ago to bypass the inbound firewall, and it worked like a charm!
(nowadays with keys/certs and openvpn, its not required to be devious )
Old 11-07-2012, 08:42 PM   #32
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But I already found a new product from that provides the needed level of protection on the system resources.
I installed a trail version on my server it work excellent! I can control several Linux boxes and the PC as well from the single control station just by sending simple email messages. The system authenticates me and allows me to perform only the subset of commands I set up in configuration. Actually I can configure it to perform just 2 or 3 commands/scripts to control my application only (start/stop/status e.t.c.) or to assign a full set of Linux command except shutdown, reboot and rm for example. So the configuration options are amazing and it just opened a new world for me..
This company is just came up with this product and no one is know about the yet... I just know about them from my friend who knows their developer...
Old 11-07-2012, 10:29 PM   #33
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Not sure how the product will work out for you but this is certainly doable. Generate client certificates and server certificates from the same root server. You can then send encrypted emails to an address that you created to receive the emails and using PKI send everything over encrypted so if someone were to intercept it they would only have the TO address and the subject. The body (with the commands) would be encrypted and only to be decrypted by the address on the server which only you hold the private key for on the server.
Old 12-06-2012, 06:56 AM   #34
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This new tool now provides end-to-end message encryption without PKI, so the content of command and the answer from server are transferred securely.
Old 05-22-2013, 05:25 AM   #35
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Originally Posted by evgenyz View Post
This new tool now provides end-to-end message encryption without PKI, so the content of command and the answer from server are transferred securely.
Could you post some more info to help other users, possible? The website you list is down apparently so either bad link or site has gone offline.
Old 05-22-2013, 08:53 PM   #36
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The web site is
Let me know if can access it.
Old 02-01-2014, 01:29 PM   #37
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Originally Posted by evgenyz View Post
I'm looking for secured way to send command by email to my remote Linux server for execution. Is anybody familiar with such tool?

I have been researching the same concept, and had been focusing on PGP to avoid spoof / hijack attempts. I came across this solution. I am sure there is more out there:

My idea was to send an encrypted request (and PGP is even available on droid tablets now), and have an isolated server with its own mail account process the request. Results would then be sent from serveR via encrypted message to the originator of the request.

With a minimum of capital outlay.

Benefits, I think are multifold: mainly a way to tunnel through carrier grade NAT; BUT ALSO allowing access to SOHO systems. or from otherwise limited devices (i.e. devices with only SMS or mail capabilities), or communication between automated servers through a commonly allowed service (POP3).

In the end, the issue requires this:

Secure authentication and transmission of traffic.
Batch execution, or if not, some way to track state.

Last edited by nettmaus; 02-01-2014 at 01:46 PM.


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