[kamailio] TLS [client:default] no way to verify_certificate but not require_certificate (#551)
26 Mar
2016
26 Mar
'16
8:58 p.m.
I have the following settings in tls.cfg and I'd like to verify the server certificate
IF one is provided on outbound (client) connections, but this doesn't seem possible
and set_verification spits out **Server MUST present valid certificate**. The default
tls.cfg https://github.com/kamailio/kamailio/blob/master/modules/tls/tls.cfg#L41 seems to
indicate that this is possible.
```
[client:default]
method = TLSv1+
verify_certificate = yes
require_certificate = no
private_key = /etc/kamailio/our.key.pem
certificate = /etc/kamailio/our.crt.pem
verify_depth = 2
ca_list = /etc/pki/tls/cert.pem
```
When starting Kamailio...
```
INFO: tls [tls_domain.c:278]: fill_missing(): TLSc<default>: tls_method=20
INFO: tls [tls_domain.c:290]: fill_missing(): TLSc<default>:
certificate='/etc/kamailio/our.crt.pem'
INFO: tls [tls_domain.c:297]: fill_missing(): TLSc<default>:
ca_list='/etc/pki/tls/cert.pem'
INFO: tls [tls_domain.c:304]: fill_missing(): TLSc<default>: crl='(null)'
INFO: tls [tls_domain.c:308]: fill_missing(): TLSc<default>: require_certificate=0
INFO: tls [tls_domain.c:322]: fill_missing(): TLSc<default>:
private_key='/etc/kamailio/our.key.pem'
INFO: tls [tls_domain.c:326]: fill_missing(): TLSc<default>: verify_certificate=1
INFO: tls [tls_domain.c:329]: fill_missing(): TLSc<default>: verify_depth=2
INFO: tls [tls_domain.c:667]: set_verification(): TLSc<default>: Server MUST present
valid certificate
```
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28 Mar
28 Mar
11:30 a.m.
I am not sure I understand you. When you set up a client connection from Kamailio to
another SIP server, the other SIP server is the TLS server. TLS servers always present
certificates.
The require certificate setting is used when your kamailio is a TLS Server and decides
whether Kamailio will require a certificate or not. Are you looking for a configuration
where Kamailio as a TLS server optionally requires a TLS client certificate?
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11:33 a.m.
I vaguely remember that earlier versions of TLS could not optionally accept client certs,
Need to do some research here.
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1 Apr
1 Apr
12:45 a.m.
New subject: [kamailio/kamailio] TLS [client:default] no way to verify_certificate but not require_certificate (#551)
I have some Zoiper/Android clients which use TLS, but don't (yet) have the ability to
specify the certificate that is used and don't seem to send a certificate when
receiving a call. When Kamailio routes a call to one of these devices that register with
dynamic addresses, Kamailio (acting as a client) won't be able verify the the
device's (acting a a server) certificate. I'd like to set my default client
settings to verify the certificate IF it is provided. Something like what is available for
```[server:default]```.
```
[client:default]
verify_certificate = yes
require_certificate = no
```
When testing to see what (if any) certificate Zoiper sends when Zoiper receives a TLS
connection, I only get the following.
```
$ openssl s_client -connect 10.1.1.201:43965 -tls1 -showcerts
socket: Bad file descriptor
connect:errno=9
```
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8:04 a.m.
New subject: [kamailio/kamailio] TLS [client:default] no way to verify_certificate but not require_certificate (#551)
Ok. I think you misunderstand how TLS works. Every server is required to have a
certificate. If Zoiper doesn't have a certificate we can not set up a TLS connection
to the client. This is why we implemented SIP Outbound, which allows the client to set up
a TLS connection and keep it open, and allows the server to use that client-managed
connection to be used for outbound requests, like calls.
What you want to do is not technically possible. Contact the Zoiper team to please remind
them that Olle asked them to implement SIP outbound and you need it as well. Thank you!
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8:04 a.m.
New subject: [kamailio/kamailio] TLS [client:default] no way to verify_certificate but not require_certificate (#551)
Closed #551.
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4:33 p.m.
New subject: [kamailio/kamailio] TLS [client:default] no way to verify_certificate but not require_certificate (#551)
Thank kindly you for the explanation @oej.
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2970
days inactive
2976
days old
6 comments
2 participants
participants (2)
-
Anthony Messina -
Olle E. Johansson