[CentOS] Could not complete SSL handshake to Amazon EC2 host

Fri May 1 11:18:35 UTC 2015
Eero Volotinen <eero.volotinen at iki.fi>

well. how about trying default setting and running nrped without xinetd.

--
Eero

2015-05-01 14:14 GMT+03:00 Tim Dunphy <bluethundr at gmail.com>:

> > This is strange...
> > Do you have SSL aktive on both systems? Run nrpr localy without
> parameters
> > (this should return some nrpe stats) and check ldd for libssl.
>
>
> I don't seem to have that command.
>
>
> [root at monitor1:~] #find / -name "*nrpr" 2> /dev/null
> [root at monitor1:~] #
>
> And that's on either system.
>
>  And if I do an ldd on both, this is what I can tell:
>
> Server:
>
> [root at monitor1:~] #ldd /usr/local/nagios/libexec/check_nrpe
>         linux-vdso.so.1 =>  (0x00007fffd895d000)
>        * libssl.so.10 => /lib64/libssl.so.10 (0x00007fc61722a000)*
> *        libcrypto.so.10 => /lib64/libcrypto.so.10 (0x00007fc616e43000)*
>         libnsl.so.1 => /lib64/libnsl.so.1 (0x00007fc616c29000)
>         libc.so.6 => /lib64/libc.so.6 (0x00007fc616868000)
>         libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2
> (0x00007fc61661c000)
>         libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007fc616338000)
>         libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007fc616134000)
>         libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007fc615f02000)
>         libdl.so.2 => /lib64/libdl.so.2 (0x00007fc615cfd000)
>         libz.so.1 => /lib64/libz.so.1 (0x00007fc615ae7000)
>         /lib64/ld-linux-x86-64.so.2 (0x00007fc6174a0000)
>         libkrb5support.so.0 => /lib64/libkrb5support.so.0
> (0x00007fc6158d8000)
>         libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007fc6156d3000)
>         libresolv.so.2 => /lib64/libresolv.so.2 (0x00007fc6154b9000)
>         libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc61529d000)
>         libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fc615077000)
>         libpcre.so.1 => /lib64/libpcre.so.1 (0x00007fc614e16000)
>         liblzma.so.5 => /lib64/liblzma.so.5 (0x00007fc614bf1000)
>
>
> Client:
>
> [root at ops:~] #ldd /usr/local/nagios/libexec/check_nrpe
>        * libssl.so.6 => /lib64/libssl.so.6 (0x00002aaaaaaba000)*
> *        libcrypto.so.6 => /lib64/libcrypto.so.6 (0x00002aaaaad08000)*
>         libnsl.so.1 => /lib64/libnsl.so.1 (0x00002aaaab05a000)
>         libc.so.6 => /lib64/libc.so.6 (0x00002aaaab273000)
>         libgssapi_krb5.so.2 => /usr/lib64/libgssapi_krb5.so.2
> (0x00002aaaab5cc000)
>         libkrb5.so.3 => /usr/lib64/libkrb5.so.3 (0x00002aaaab7fa000)
>         libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00002aaaaba90000)
>         libk5crypto.so.3 => /usr/lib64/libk5crypto.so.3
> (0x00002aaaabc92000)
>         libdl.so.2 => /lib64/libdl.so.2 (0x00002aaaabeb7000)
>         libz.so.1 => /lib64/libz.so.1 (0x00002aaaac0bc000)
>         /lib64/ld-linux-x86-64.so.2 (0x0000555555554000)
>         libkrb5support.so.0 => /usr/lib64/libkrb5support.so.0 (0x0
> 0002aaaac2d0000)
>         libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00002aaaac4d8000)
>         libresolv.so.2 => /lib64/libresolv.so.2 (0x00002aaaac6db000)
>         libselinux.so.1 => /lib64/libselinux.so.1 (0x00002aaaac8f0000)
>         libsepol.so.1 => /lib64/libsepol.so.1 (0x00002aaaacb09000)
>
>
> So it looks like everything is OK from the SSL end of things. Any other
> ideas or suggestions?
>
> Thanks
> Tim
>
> On Fri, May 1, 2015 at 5:46 AM, Eric Lehmann <e.lehmann88 at gmail.com>
> wrote:
>
> > This is strange...
> > Do you have SSL aktive on both systems? Run nrpr localy without
> parameters
> > (this should return some nrpe stats) and check ldd for libssl.
> > Am 01.05.2015 07:32 schrieb "Tim Dunphy" <bluethundr at gmail.com>:
> >
> > > Hi Eric,
> > >
> > >  Thanks for your reply. I do have nrpe running under xinetd on the host
> > I'm
> > > trying to monitor.
> > >
> > >  And running the nrpe checl locally:
> > >
> > > [root at ops:~] #/usr/local/nagios/libexec/check_nrpe -H localhost
> > > NRPE v2.15
> > >
> > > [root at ops:~] #grep only_from /etc/xinetd.d/nrpe
> > >         only_from       = 127.0.0.1 216.120.248.126
> > >
> > > And I do have port 5666 open on the security group for this host.
> > >
> > > And I made sure the local firewall was stopped, because I am blocking
> > ports
> > > with the security groups instead.
> > >
> > > [root at ops:~] #service iptables status
> > > Firewall is stopped.
> > >
> > > It's only when checking from the monitoring host that nrpe fails:
> > >
> > > [root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe -H
> > > ops.jokefire.com
> > > CHECK_NRPE: Error - Could not complete SSL handshake.
> > >
> > > Really, really puzzling. This is driving me up a wall!! I hopeI can
> solve
> > > this soon....
> > >
> > > Thanks for any and all help with this one!!
> > > Tim
> > >
> > > On Fri, May 1, 2015 at 1:02 AM, Eric Lehmann <e.lehmann88 at gmail.com>
> > > wrote:
> > >
> > > > Hi
> > > > Does the deamon run under xinetd? Then  you have to configure the
> > > only_from
> > > > in  */etc/**xinetd.d**/**nrpe* to.
> > > >
> > > > Regards
> > > > Eric
> > > > Am 01.05.2015 06:46 schrieb "Tim Dunphy" <bluethundr at gmail.com>:
> > > >
> > > > > Hello,
> > > > >
> > > > >  I am trying to monitor a host in the Amazon EC2 cloud.
> > > > >
> > > > > Yet when I try to check NRPE from the monitoring host I am getting
> an
> > > SSL
> > > > > handshake error:
> > > > >
> > > > > [root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe -H
> > > > > ops.jokefire.com
> > > > > CHECK_NRPE: Error - Could not complete SSL handshake.
> > > > >
> > > > > And if I telnet into the host on port 5666 to see if the FW port is
> > > open,
> > > > > the connection closes right away:
> > > > >
> > > > > [root at monitor1:~] #telnet ops.somewhere.com 5666
> > > > > Trying 54.225.218.125...
> > > > > Connected to ops.somewhere.com.
> > > > > Escape character is '^]'.
> > > > > Connection closed by foreign host.
> > > > >
> > > > > You can see there it connects, but then it closes immediately after
> > the
> > > > > connection.
> > > > >
> > > > >  I have NRPE running on the host I want to monitor:
> > > > >
> > > > > [root at ops:~] #lsof -i :5666
> > > > > COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
> > > > > xinetd  1434 root    5u  IPv4   4063       TCP *:nrpe (LISTEN)
> > > > >
> > > > > And I have the IP of my nagios server listed in the xinetd conf
> file:
> > > > >
> > > > > [root at ops:~] #cat /etc/xinetd.d/nrpe
> > > > > # default: on
> > > > > # description: NRPE (Nagios Remote Plugin Executor)
> > > > > service nrpe
> > > > > {
> > > > >         flags           = REUSE
> > > > >         socket_type     = stream
> > > > >         port            = 5666
> > > > >         wait            = no
> > > > >         user            = nagios
> > > > >         group           = nagios
> > > > >         server          = /usr/local/nagios/bin/nrpe
> > > > >         server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
> > > > >         log_on_failure  += USERID
> > > > >         disable         = no
> > > > >         only_from       = 127.0.0.1 xx.xx.xx.xx   # <- representing
> > my
> > > > real
> > > > > nagios server IP
> > > > > }
> > > > >
> > > > >
> > > > >
> > > > > And I have my default security group for that host open on port
> 5666
> > to
> > > > the
> > > > > world for this experiment.  I plan on locking that down again to
> the
> > > > single
> > > > > IP of my monitoring host once I get this resolved.
> > > > >
> > > > > Does anyone have any suggestions on how I can get that problem
> > solved?
> > > > >
> > > > > Thanks,
> > > > > Tim
> > > > >
> > > > > --
> > > > > GPG me!!
> > > > >
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