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Very Hot Topic (More than 25 Replies) Encryption: TLS, SRTP & ZRTP (Read 123244 times)
botyhc
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Re: Encryption: TLS, SRTP & ZRTP
Reply #135 - 16. Oct 2012 at 10:44
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There should be an option to ensure the media is encrypted, otherwise to warn the user and drop the call. 
If you see even soft phones (in addition to hard phones) like eyebeam for example, they have an option where if the user selects that media must be encrypted, they won't do the call and give an indicative error.
Snom for example is a very very respected phone and they have this option where SRTP if selected as required, won't do the call unless it is SRTP.

You can put an option but not make it on by default. The person using it can choose to enable it.

This is quite similar to the TLS option where you put connection type is fixed since if its not secure we don't want it to fall back.
  
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Re: Encryption: TLS, SRTP & ZRTP
Reply #136 - 17. Oct 2012 at 08:40
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If you are using such Snom phone and you are initiate a call to PhonerLite. What exactly happens if PhonerLite answers the call without SRTP? Does the Snom phone disconnect the call immediately?
  
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Nuno Goncalves
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Re: Encryption: TLS, SRTP & ZRTP
Reply #137 - 08. Sep 2013 at 16:41
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Could you clarify how the certificates are being handled currently?

1 - on the GUI there is a distinct box for the server certificate and server private key, but only one for the client. So the client certificate must have the key built-in, but the server must be separate?

2 - If the transport is TLS, what does "check certificate from the remote site" do?

3 - What does "Load Windows CA" do? Without this it only accepts CACert and root certificates on the PhonerLite folder?

Thanks!
  
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Re: Encryption: TLS, SRTP & ZRTP
Reply #138 - 09. Sep 2013 at 13:41
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Quote:
1 - on the GUI there is a distinct box for the server certificate and server private key, but only one for the client. So the client certificate must have the key built-in, but the server must be separate?
Until now there was no great need for a supporting client certificates. Does your peer requests it? But you are true - until now a single file is needed.

Quote:
2 - If the transport is TLS, what does "check certificate from the remote site" do?
I had some problems with peer certificates. Therefore checking the certificate can be disabled. Please keep in mind, that PhonerLite is just a hobby project. For me the technical questions are more interesting than a perfect secure solution.

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3 - What does "Load Windows CA" do? Without this it only accepts CACert and root certificates on the PhonerLite folder?
Exactly!
  
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TonyOZ
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Re: Encryption: TLS, SRTP & ZRTP
Reply #139 - 25. Apr 2016 at 11:47
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I'm trying to understand whether my SIP provider supports the TLS for SIP.

I tick the "check certificate from the remote site" and the "Load Windows CA" because I expect that provider to have an SSL certificate from a known root CA (like Thawte or Comodo).

I select the TLS in the "Network->Preferred connection type" tab.
Then I see PhonerLite registering successfully (the green button in the status field) and the notice: "...;transport=tcp registered".

Does that mean my SIP provider declines the TLS mode and falls back to plain unencrypted TCP?
  

PhonerLite v2.17 on winXP-SP3.
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Re: Encryption: TLS, SRTP & ZRTP
Reply #140 - 25. Apr 2016 at 13:14
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You can activate the option "connection type is fixed", then PhonerLite doesn't do any fallback to unencrypted connections.
If you don't enable this certificate check the TLS connection is established?
  
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TonyOZ
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Re: Encryption: TLS, SRTP & ZRTP
Reply #141 - 25. Apr 2016 at 17:31
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Dear Heiko,

Thank you for the hint.

Alas, no. This time I get "...:5061;transport=tls not registered <Connectivity Checks Failed>".

Is that final and I cannot do anything about it?

BTW
My signature is outdated, I'm on PL v2.37 (on winXP-SP3)
  

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Re: Encryption: TLS, SRTP & ZRTP
Reply #142 - 26. Apr 2016 at 09:35
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So your SIP provider doesn't support TLS!
  
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Re: Encryption: TLS, SRTP & ZRTP
Reply #143 - 27. Apr 2016 at 11:24
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Thank you again!

So, to finalise the question:
My understanding is that if a provider implements TLS with a cert from a well-known root CA - I would be able to enable it on PhonerLite without importing/installing any certificates - just by referencing to my OS's cert store.
Right?
  

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Re: Encryption: TLS, SRTP & ZRTP
Reply #144 - 27. Apr 2016 at 11:26
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That is true. But you might check first without any certificate check. I assume that your provider doesn't support TLS for SIP at all.
  
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TonyOZ
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Re: Encryption: TLS, SRTP & ZRTP
Reply #145 - 16. Jun 2016 at 17:08
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Just noticed that the latest PhonerLite does not have the ZRTP "masquerade" capability any more.
Why is that?
  

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Re: Encryption: TLS, SRTP & ZRTP
Reply #146 - 17. Jun 2016 at 07:54
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This option is still supported. To reduce the number of visual combobox elements, this option is now available via context menu for "ZRTP".
  
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Re: Encryption: TLS, SRTP & ZRTP
Reply #147 - 20. Jun 2016 at 17:47
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OK, got it!
Thank you.
  

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Re: Encryption: TLS, SRTP & ZRTP
Reply #148 - 27. Nov 2017 at 14:35
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Do it is possible to configure a sure comunication with a self-signed certificate generated using OpenSSL?
  
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Re: Encryption: TLS, SRTP & ZRTP
Reply #149 - 27. Nov 2017 at 15:58
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So you want to connect by TLS to a SIP server that uses self signed certificates? Take a look at the "Certificate" configuration page. There is an option called "check certificate from the remote site". If that option is not active, all certificates are accepted.
  
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