[CentOS] Could not complete SSL handshake to Amazon EC2 host
Tim Dunphy
bluethundr at gmail.com
Fri May 1 11:14:09 UTC 2015
> 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
> > > >
> > > > --
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> > > >
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> >
> >
> >
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