Hi all,

I am trying to set up a centralized syslog server, with encryption and authentication over TCP.

Communication is ok, encryption too, but I can't get the authentication to work.

Here is my actual configuration, reduced to what is needed :

Client :
source s_src {
    unix-dgram("/dev/log");
    internal();
    file("/proc/kmsg" program_override("kernel"));
};
...
destination d_net {
    tcp("192.168.0.42"
        port(4242)
        tls(
            ca_dir("/etc/rsyslog.d/certs/CA/")
            cert_file("/etc/rsyslog.d/certs/client.crt")
            key_file("/etc/rsyslog.d/certs/client.key")
            peer_verify(optional-untrusted)
        )
        log_fifo_size(1000)
    );
};
...
log { source(s_src); destination(d_net); };

Server :
source s_src {
    # Local logging
    unix-dgram("/dev/log");
    file("/proc/kmsg" program_override("kernel"));
    # Remote logging
    tcp(
        port(4242)
        tls(
            ca_dir("/etc/syslog-ng/certs/CA/")
            cert_file("/etc/syslog-ng/certs/server.crt")
            key_file("/etc/syslog-ng/certs/server.key")
            peer_verify(optional-untrusted)
        )
    );
};

The CA which was used to sign these certificates is world readable and located in /etc/syslog-ng/certs/CA/

This setup works : server is getting client's logs, and cypherred on the wire.

When I replace peer_verify(optional-untrusted) by peer_verify(required-trusted), in order to get mutual authentication, I get this error :

==> /var/log/error <==
Jan  6 14:42:09 client syslog-ng[11086]: Certificate validation failed; subject='emailAddress=email@address.com, CN=server.fqdn, OU=Org Unit, O=Company, L=City, ST=Crountry, C=ID', issuer='emailAddress=email@address.com, CN=Root CA, OU=Org Unit, O=Company Root CA, L=City, ST=Country, C=ID', error='unable to get local issuer certificate', depth='0'
Jan  6 14:42:09 client syslog-ng[11086]: SSL error while writing stream; tls_error='SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed'
Jan  6 14:42:09 client syslog-ng[11086]: I/O error occurred while writing; fd='9', error='Broken pipe (32)'

==> /var/log/messages <==
Jan  6 14:42:09 client syslog-ng[11086]: Syslog connection broken; fd='9', server='AF_INET(192.168.0.42:4242)', time_reopen='60'

But my certificates are good :

openssl verify -CAfile /etc/syslog-ng/certs/CA/ca.crt -purpose any /etc/syslog-ng/certs/client.crt
/etc/syslog-ng/certs/client.crt: OK
openssl verify -CAfile /etc/syslog-ng/certs/CA/ca.crt -purpose any /etc/syslog-ng/certs/server.crt
/etc/syslog-ng/certs/server.crt: OK

More informations :

root@[client|server]:~ #
syslog-ng -V
syslog-ng 3.1.3
Installer-Version: 3.1.3
Revision: ssh+git://bazsi@git.balabit//var/scm/git/syslog-ng/syslog-ng-ose--mainline--3.1#master#def34661b08109f8148904b860457d5747c425b3
Compile-Date: Nov 28 2010 12:29:35
Enable-Threads: on
Enable-Debug: off
Enable-GProf: off
Enable-Memtrace: off
Enable-Sun-STREAMS: off
Enable-Sun-Door: off
Enable-IPv6: on
Enable-Spoof-Source: on
Enable-TCP-Wrapper: on
Enable-SSL: on
Enable-SQL: on
Enable-Linux-Caps: on
Enable-Pcre: on

Does someone has any clue on what's going wrong ?

-- 
Fabien Bagard
IT Department
tel + 33 (0)1 48 03 60 40

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Parrot SA
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