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98 lines
2.8 KiB
Plaintext
98 lines
2.8 KiB
Plaintext
Asterisk SIP/TLS Transport
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==========================
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When using TLS the client will typically check the validity of the
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certificate chain. So that means you either need a certificate that is
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signed by one of the larger CAs, or if you use a self signed certificate
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you must install a copy of your CA certificate on the client.
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So far this code has been test with:
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- Asterisk as client and server (TLS and TCP)
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- Polycom Soundpoint IP Phones (TLS and TCP)
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Polycom phones require that the host (ip or hostname) that is
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configured match the 'common name' in the certificate
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- Minisip Softphone (TLS and TCP)
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- Cisco IOS Gateways (TCP only)
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- SNOM 360 (TLS only)
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- Zoiper Biz Softphone (TLS and TCP)
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sip.conf options
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----------------
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tlsenable=[yes|no]
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Enable TLS server, default is no
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tlsbindaddr=<ip address>
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Specify IP address to bind TLS server to, default is 0.0.0.0
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tlscertfile=</path/to/certificate>
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The server's certificate file. Should include the key and
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certificate. This is mandatory if your going to run a TLS server.
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tlscafile=</path/to/certificate>
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If the server your connecting to uses a self signed certificate
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you should have their certificate installed here so the code can
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verify the authenticity of their certificate.
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tlscadir=</path/to/ca/dir>
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A directory full of CA certificates. The files must be named with
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the CA subject name hash value.
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(see man SSL_CTX_load_verify_locations for more info)
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tlsdontverifyserver=[yes|no]
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If set to yes, don't verify the servers certificate when acting as
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a client. If you don't have the server's CA certificate you can
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set this and it will connect without requiring tlscafile to be set.
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Default is no.
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tlscipher=<SSL cipher string>
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A string specifying which SSL ciphers to use or not use
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A list of valid SSL cipher strings can be found at:
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http://www.openssl.org/docs/apps/ciphers.html#CIPHER_STRINGS
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Sample config
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-------------
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Here are the relevant bits of config for setting up TLS between 2
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asterisk servers. With server_a registering to server_b
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On server_a:
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[general]
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tlsenable=yes
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tlscertfile=/etc/asterisk/asterisk.pem
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tlscafile=/etc/ssl/ca.pem ; This is the CA file used to generate both certificates
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register => tls://100:test@192.168.0.100:5061
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[101]
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type=friend
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context=internal
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host=192.168.0.100 ; The host should be either IP or hostname and should
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; match the 'common name' field in the servers certificate
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secret=test
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dtmfmode=rfc2833
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disallow=all
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allow=ulaw
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transport=tls
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port=5061
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On server_b:
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[general]
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tlsenable=yes
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tlscertfile=/etc/asterisk/asterisk.pem
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[100]
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type=friend
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context=internal
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host=dynamic
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secret=test
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dtmfmode=rfc2833
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disallow=all
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allow=ulaw
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;You can specify transport= and port=5061 for TLS, but its not necessary in
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;the server configuration, any type of SIP transport will work
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;transport=tls
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;port=5061
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