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bugzilla-daemon at mindrot.org

2013-Dec-20 19:03 UTC

[Bug 2190] New: Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

            Bug ID: 2190
           Summary: Nagios command check_ssh
           Product: Portable OpenSSH
           Version: 6.2p1
          Hardware: ix86
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: kiril at varnakov.net

Hi. Nagios command "check_ssh" sometimes cause the problem on server
side in auth.log:

Dec 20 22:43:24 ns1 sshd[15957]: fatal: Read from socket failed:
Connection reset by peer [preauth]
Dec 20 22:43:31 ns1 sshd[93749]: fatal: Read from socket failed:
Connection reset by peer [preauth]
Dec 20 22:43:33 ns1 sshd[8780]: fatal: Read from socket failed:
Connection 
reset by peer [preauth]
Dec 20 22:43:33 ns1 sshd[32834]: fatal: Read from socket failed:
Connection reset by peer [preauth]

sometimes no:

Dec 20 22:43:24 ns1 sshd[50110]: Connection closed by 1.1.1.1 [preauth]
Dec 20 22:43:32 ns1 sshd[96172]: Connection closed by 1.1.1.1 [preauth]
Dec 20 22:43:32 ns1 sshd[98599]: Connection closed by 1.1.1.1 [preauth]

Help.

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bugzilla-daemon at mindrot.org

2013-Dec-21 06:33 UTC

head link

[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
Right, so check_ssh is opening a connection to a sshd and closing it
ungracefully. What's the actual problem?

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bugzilla-daemon at mindrot.org

2013-Dec-21 06:57 UTC

head link

[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #2 from Kiril Varnakov <kiril at varnakov.net> ---
Why sometimes good, sometimes bad?

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bugzilla-daemon at mindrot.org

2013-Dec-21 08:52 UTC

head link

[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dtucker at zip.com.au

--- Comment #3 from Darren Tucker <dtucker at zip.com.au> ---
You'll probably need to provide some more information to tell that,
either from the server (LogLevel debug3) or the client (via whatever
mechanism it has).

Long shot guess: the server is hitting the MaxStartups limit?

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bugzilla-daemon at mindrot.org

2013-Dec-21 10:04 UTC

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[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #4 from Kiril Varnakov <kiril at varnakov.net> ---
MaxStartups 10 (i set default), only I and Nagios connected to server.
It happened after upgrade from 5 to 6. And now servers send me periodic
with this failed message... Nagios command 'check_ssh' don't have
debug
parameter (.

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bugzilla-daemon at mindrot.org

2013-Dec-21 10:54 UTC

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[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #5 from Darren Tucker <dtucker at zip.com.au> ---
the server can still provide some logs, but you haven't provided them,
and without anything to go on we can't help.

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bugzilla-daemon at mindrot.org

2013-Dec-21 11:22 UTC

head link

[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #6 from Kiril Varnakov <kiril at varnakov.net> ---
Server side:

root at ns1:/home/kvarnakov # /usr/local/sbin/sshd -ddd
debug2: load_server_config: filename /usr/local/etc/ssh/sshd_config
debug2: load_server_config: done config len = 1235
debug2: parse_server_config: config /usr/local/etc/ssh/sshd_config len
1235
debug3: /usr/local/etc/ssh/sshd_config:13 setting Port 22
debug3: /usr/local/etc/ssh/sshd_config:16 setting ListenAddress 1.1.1.1
debug3: /usr/local/etc/ssh/sshd_config:21 setting Protocol 2
debug3: /usr/local/etc/ssh/sshd_config:26 setting HostKey
/usr/local/etc/ssh/ssh_host_rsa_key
debug3: /usr/local/etc/ssh/sshd_config:27 setting HostKey
/usr/local/etc/ssh/ssh_host_dsa_key
debug3: /usr/local/etc/ssh/sshd_config:30 setting
KeyRegenerationInterval 1h
debug3: /usr/local/etc/ssh/sshd_config:31 setting ServerKeyBits 1024
debug3: /usr/local/etc/ssh/sshd_config:35 setting SyslogFacility AUTH
debug3: /usr/local/etc/ssh/sshd_config:36 setting LogLevel debug3
debug3: /usr/local/etc/ssh/sshd_config:40 setting LoginGraceTime 1m
debug3: /usr/local/etc/ssh/sshd_config:41 setting PermitRootLogin no
debug3: /usr/local/etc/ssh/sshd_config:42 setting StrictModes yes
debug3: /usr/local/etc/ssh/sshd_config:43 setting MaxAuthTries 3
debug3: /usr/local/etc/ssh/sshd_config:44 setting MaxSessions 10
debug3: /usr/local/etc/ssh/sshd_config:46 setting RSAAuthentication no
debug3: /usr/local/etc/ssh/sshd_config:47 setting PubkeyAuthentication
yes
debug3: /usr/local/etc/ssh/sshd_config:48 setting AuthorizedKeysFile
.ssh/authorized_keys
debug3: /usr/local/etc/ssh/sshd_config:51 setting
RhostsRSAAuthentication no
debug3: /usr/local/etc/ssh/sshd_config:53 setting
HostbasedAuthentication no
debug3: /usr/local/etc/ssh/sshd_config:61 setting
PasswordAuthentication no
debug3: /usr/local/etc/ssh/sshd_config:62 setting PermitEmptyPasswords
no
debug3: /usr/local/etc/ssh/sshd_config:65 setting
ChallengeResponseAuthentication yes
debug3: /usr/local/etc/ssh/sshd_config:86 setting UsePAM yes
debug3: /usr/local/etc/ssh/sshd_config:88 setting AllowAgentForwarding
no
debug3: /usr/local/etc/ssh/sshd_config:89 setting AllowTcpForwarding no
debug3: /usr/local/etc/ssh/sshd_config:90 setting GatewayPorts no
debug3: /usr/local/etc/ssh/sshd_config:91 setting X11Forwarding no
debug3: /usr/local/etc/ssh/sshd_config:95 setting PrintMotd yes
debug3: /usr/local/etc/ssh/sshd_config:96 setting PrintLastLog yes
debug3: /usr/local/etc/ssh/sshd_config:97 setting TCPKeepAlive yes
debug3: /usr/local/etc/ssh/sshd_config:99 setting UseLogin no
debug3: /usr/local/etc/ssh/sshd_config:100 setting
UsePrivilegeSeparation yes
debug3: /usr/local/etc/ssh/sshd_config:101 setting
PermitUserEnvironment no
debug3: /usr/local/etc/ssh/sshd_config:103 setting Compression delayed
debug3: /usr/local/etc/ssh/sshd_config:104 setting ClientAliveInterval
0
debug3: /usr/local/etc/ssh/sshd_config:105 setting ClientAliveCountMax
3
debug3: /usr/local/etc/ssh/sshd_config:106 setting UseDNS yes
debug3: /usr/local/etc/ssh/sshd_config:108 setting PidFile
/var/run/sshd.pid
debug3: /usr/local/etc/ssh/sshd_config:109 setting MaxStartups 10
debug3: /usr/local/etc/ssh/sshd_config:111 setting PermitTunnel no
debug3: /usr/local/etc/ssh/sshd_config:112 setting ChrootDirectory none
debug3: /usr/local/etc/ssh/sshd_config:115 setting Banner none
debug3: /usr/local/etc/ssh/sshd_config:119 setting UseLPK yes
debug3: /usr/local/etc/ssh/sshd_config:121 setting LpkServers
ldap://srv01.ldap.ru ldap://srv02.ldap.ru
debug3: /usr/local/etc/ssh/sshd_config:122 setting LpkUserDN
ou=users,ou=sys,o=ldap,c=ru
debug3: /usr/local/etc/ssh/sshd_config:123 setting LpkGroupDN
ou=groups,ou=sys,o=ldap,c=ru
debug3: /usr/local/etc/ssh/sshd_config:124 setting LpkForceTLS no
debug3: /usr/local/etc/ssh/sshd_config:125 setting LpkSearchTimelimit 3
debug3: /usr/local/etc/ssh/sshd_config:126 setting LpkBindTimelimit 3
debug3: /usr/local/etc/ssh/sshd_config:129 setting Subsystem sftp   
/usr/local/libexec/sftp-server
debug1: sshd version OpenSSH_6.2p2 FreeBSD-openssh-portable-6.2.p2_3,1,
OpenSSL 0.9.8y 5 Feb 2013
debug3: Incorrect RSA1 identifier
debug1: read PEM private key done: type RSA
debug1: private host key: #0 type 1 RSA
debug3: Incorrect RSA1 identifier
debug1: read PEM private key done: type DSA
debug1: private host key: #1 type 2 DSA
debug1: rexec_argv[0]='/usr/local/sbin/sshd'
debug1: rexec_argv[1]='-ddd'
debug1: madvise(): Operation not permitted
debug2: fd 4 setting O_NONBLOCK
debug1: Bind to port 22 on 1.1.1.1
Server listening on 1.1.1.1 port 22.
debug1: fd 5 clearing O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 8 config len 1235
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 4, 4
Connection from 2.2.2.2 port 27871
debug1: Client protocol version 2.0; client software version
check_ssh_1.4.16
debug1: no match: check_ssh_1.4.16
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.2p2
FreeBSD-openssh-portable-6.2.p2_3,1
debug2: fd 4 setting O_NONBLOCK
debug2: Network child is on pid 49597
debug3: preauth child monitor started
debug3: privsep user:group 22:22 [preauth]
debug1: permanently_set_uid: 22/22 [preauth]
debug1: list_hostkey_types: ssh-rsa,ssh-dss [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
Read from socket failed: Connection reset by peer [preauth]
debug1: do_cleanup [preauth]
debug3: PAM: sshpam_thread_cleanup entering [preauth]
debug1: monitor_read_log: child log fd closed
debug3: mm_request_receive entering
debug1: do_cleanup
debug3: PAM: sshpam_thread_cleanup entering
debug1: Killing privsep child 49597

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bugzilla-daemon at mindrot.org

2013-Dec-21 11:36 UTC

head link

[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #7 from Kiril Varnakov <kiril at varnakov.net> ---
I use nss-pam-ldapd, may be it problem...

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bugzilla-daemon at mindrot.org

2013-Dec-21 12:15 UTC

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[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #8 from Darren Tucker <dtucker at zip.com.au> ---
A couple of things:

(In reply to Kiril Varnakov from comment #6)
[...]> debug1: sshd version OpenSSH_6.2p2
> FreeBSD-openssh-portable-6.2.p2_3,1, OpenSSL 0.9.8y 5 Feb 2013
This is a modified version of sshd.  Can you reproduce the problem with
the stock version compiled from the source on openssh.com?
> debug1: SSH2_MSG_KEXINIT sent [preauth]
> Read from socket failed: Connection reset by peer [preauth]
this looks like the client is crashing during key exchange.  A number
of methods and ciphers were added in recent versions and some clients
have had trouble with the size of the list.  you could try disabling
some of them in the server config:

KexAlgorithms
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

Ciphers
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour

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bugzilla-daemon at mindrot.org

2013-Dec-21 12:39 UTC

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[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #9 from Kiril Varnakov <kiril at varnakov.net> ---
With ssh from base system:

--------------------------------------------------------
root at ns1:/home/kvarnakov # /usr/sbin/sshd -ddd
debug2: load_server_config: filename /etc/ssh/sshd_config
debug2: load_server_config: done config len = 883
debug2: parse_server_config: config /etc/ssh/sshd_config len 883
debug3: /etc/ssh/sshd_config:17 setting VersionAddendum ???
debug3: /etc/ssh/sshd_config:19 setting Port 22
debug3: /etc/ssh/sshd_config:20 setting Protocol 2
debug3: /etc/ssh/sshd_config:21 setting AddressFamily inet
debug3: /etc/ssh/sshd_config:22 setting ListenAddress 1.1.1.1
debug3: /etc/ssh/sshd_config:28 setting HostKey
/etc/ssh/ssh_host_dsa_key
debug3: /etc/ssh/sshd_config:31 setting KeyRegenerationInterval 1h
debug3: /etc/ssh/sshd_config:32 setting ServerKeyBits 768
debug3: /etc/ssh/sshd_config:36 setting SyslogFacility AUTH
debug3: /etc/ssh/sshd_config:37 setting LogLevel INFO
debug3: /etc/ssh/sshd_config:41 setting LoginGraceTime 2m
debug3: /etc/ssh/sshd_config:42 setting PermitRootLogin no
debug3: /etc/ssh/sshd_config:43 setting StrictModes yes
debug3: /etc/ssh/sshd_config:44 setting MaxAuthTries 3
debug3: /etc/ssh/sshd_config:46 setting RSAAuthentication no
debug3: /etc/ssh/sshd_config:47 setting PubkeyAuthentication yes
debug3: /etc/ssh/sshd_config:48 setting AuthorizedKeysFile
.ssh/authorized_keys
debug3: /etc/ssh/sshd_config:51 setting RhostsRSAAuthentication no
debug3: /etc/ssh/sshd_config:53 setting HostbasedAuthentication no
debug3: /etc/ssh/sshd_config:56 setting IgnoreUserKnownHosts yes
debug3: /etc/ssh/sshd_config:58 setting IgnoreRhosts yes
debug3: /etc/ssh/sshd_config:61 setting PasswordAuthentication yes
debug3: /etc/ssh/sshd_config:62 setting PermitEmptyPasswords no
debug3: /etc/ssh/sshd_config:65 setting ChallengeResponseAuthentication
no
debug3: /etc/ssh/sshd_config:85 setting UsePAM no
debug3: /etc/ssh/sshd_config:87 setting AllowTcpForwarding no
debug3: /etc/ssh/sshd_config:88 setting GatewayPorts no
debug3: /etc/ssh/sshd_config:89 setting X11Forwarding no
debug3: /etc/ssh/sshd_config:92 setting PrintMotd yes
debug3: /etc/ssh/sshd_config:93 setting PrintLastLog yes
debug3: /etc/ssh/sshd_config:94 setting TCPKeepAlive yes
debug3: /etc/ssh/sshd_config:95 setting UseLogin no
debug3: /etc/ssh/sshd_config:96 setting UsePrivilegeSeparation yes
debug3: /etc/ssh/sshd_config:97 setting PermitUserEnvironment no
debug3: /etc/ssh/sshd_config:98 setting Compression delayed
debug3: /etc/ssh/sshd_config:99 setting ClientAliveInterval 0
debug3: /etc/ssh/sshd_config:100 setting ClientAliveCountMax 3
debug3: /etc/ssh/sshd_config:101 setting UseDNS yes
debug3: /etc/ssh/sshd_config:102 setting PidFile /var/run/sshd.pid
debug1: HPN Buffer Size: 65536
debug1: sshd version OpenSSH_5.8p2_hpn13v11 ???
debug3: Incorrect RSA1 identifier
debug1: read PEM private key done: type DSA
debug1: private host key: #0 type 2 DSA
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-ddd'
debug1: madvise(): Operation not permitted
debug2: fd 3 setting O_NONBLOCK
debug1: Bind to port 22 on 1.1.1.1.
debug1: Server TCP RWIN socket size: 65536
debug1: HPN Buffer Size: 65536
Server listening on 81.176.72.17 port 22.
debug1: fd 4 clearing O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 7 config len 883
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug1: rexec start in 4 out 4 newsock 4 pipe -1 sock 7
debug1: inetd sockets after dupping: 3, 3
debug1: res_init()
Connection from 2.2.2.2 port 37109
debug1: HPN Disabled: 0, HPN Buffer Size: 65536
debug1: Client protocol version 2.0; client software version
check_ssh_1.4.16
debug1: no match: check_ssh_1.4.16
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8p2_hpn13v11 ???
debug2: fd 3 setting O_NONBLOCK
debug2: Network child is on pid 34321
debug3: preauth child monitor started
debug3: mm_request_receive entering
debug3: privsep user:group 22:22
debug1: permanently_set_uid: 22/22
debug1: list_hostkey_types: ssh-dss
debug1: SSH2_MSG_KEXINIT sent
Read from socket failed: Connection reset by peer
debug1: do_cleanup
debug1: do_cleanup
-------------------------------------------

but if i start in demon mode, i don't see this error in log.

PS:
With custom KexAlgorithms and Ciphers error repeated.

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bugzilla-daemon at mindrot.org

2013-Dec-21 12:50 UTC

head link

[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #10 from Darren Tucker <dtucker at zip.com.au> ---
(In reply to Kiril Varnakov from comment #9)> With ssh from base system:
> debug1: sshd version OpenSSH_5.8p2_hpn13v11 ???
this is also not the code supplied by us.  If you can reproduce the
problem with the stock code from openssh.com then we may be able to
help, otherwise you need to seek help from the people who supplied the
modified sshd.

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bugzilla-daemon at mindrot.org

2013-Dec-23 07:40 UTC

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[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

--- Comment #11 from Kiril Varnakov <kiril at varnakov.net> ---
Ok, thank you.

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bugzilla-daemon at mindrot.org

2014-Jul-03 05:35 UTC

head link

[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WORKSFORME
             Status|NEW                         |RESOLVED

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bugzilla-daemon at bugzilla.mindrot.org

2016-Aug-02 00:41 UTC

head link

[Bug 2190] Nagios command check_ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2190

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #12 from Damien Miller <djm at mindrot.org> ---
Close all resolved bugs after 7.3p1 release

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