SIP Security in Yate
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===Advantages=== | ===Advantages=== | ||
| − | * SRTP is ideal for protecting Voice over IP traffic because has no effect on IP Quality of Service. | + | * SRTP is ideal for protecting Voice over IP traffic because it can be used in conjunction with header compression and has no effect on IP Quality of Service. |
* SRTP provide significant advantages, especially for voice traffic using low-bitrate voice codecs such as G.729 and iLBC. | * SRTP provide significant advantages, especially for voice traffic using low-bitrate voice codecs such as G.729 and iLBC. | ||
* SRTP confidentiality of RTP packets protects packet payloads from being read by entities without the secret encryption key. | * SRTP confidentiality of RTP packets protects packet payloads from being read by entities without the secret encryption key. | ||
Revision as of 11:55, 15 November 2012
VoIP call signaling and call control can be secured by implementing some form of Authorization, Authentication or Transport Layer Security (TLS/SSL) mechanism and Media encryption (SRTP).
To protect the signaling messages against snooping or alteration use TLS. The protocol allows client/server applications to communicate in a way that is designed to prevent eavesdropping, tampering, or message forgery.
Using SRTP, which is a security profile for RTP will add confidentiality, message authentication, and replay protection to the protocol.
Yate can bind on UDP, TCP and TLS. This is done using a listener that it is a specific section in ysipchan.conf.
In the next steps will configure Yate to bind on TLS and to use SRTP packets for voice.
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How to set a TLS listener
In ysipchan.conf:
[general] type=tls addr=x.x.x.x port=5061 sslcontext=server_context
Configure a SSL server context
In openssl.conf
[server_context] enable=yes certificate=name.crt key=name.key
The files name.crt and name.key have to be in the same place as the configuration file in this example.
Enable SRTP
Data security protocols such as SRTP rely upon a separate key management system to securely establish encryption and/or authentication keys. TLS will protect the SDP message.
In ysipchan.conf by default secure parameter is disabled, for using SRTP you have to enable it.
[default] ; secure: bool: Generate and accept RFC 4568 security descriptors for SRTP secure=enable
Advantages
- SRTP is ideal for protecting Voice over IP traffic because it can be used in conjunction with header compression and has no effect on IP Quality of Service.
- SRTP provide significant advantages, especially for voice traffic using low-bitrate voice codecs such as G.729 and iLBC.
- SRTP confidentiality of RTP packets protects packet payloads from being read by entities without the secret encryption key.
- SRTP message authentication of RTP packets protects the integrity of a packet against forgery, alteration, or replacement.
- TLS provide privacy and data integrity between communicating applications.
See also
