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Re: ssh + kerberosV

To: OpenBSD Misc <misc@openbsd.org>
Subject: Re: ssh + kerberosV
From: Matthijs Mohlmann <matthijs@active2.homelinux.org>
Date: Sat, 29 Nov 2003 16:36:57 +0100
References: <3FC85860.9030006@lycos.com> <1070095469.576.3.camel@monster.active2.homelinux.org> <3FC86976.9040407@lycos.com> <1070105486.576.23.camel@monster.active2.homelinux.org> <3FC88F27.7090907@lycos.com> <1070115188.6303.16.camel@monster.active2.homelinux.org> <3FC8B453.80807@lycos.com>
Your ssh daemon and client doesn't have kerberos support.

I've both enabled GSSAPIAuthentication and KerberosAuthentication.

your login.conf is ok but ssh doesn't use /bin/login so you need to
enable gssapi support in ssh

On Sat, 2003-11-29 at 15:59, Julien TOUCHE wrote:
> Matthijs Mohlmann wrote:
> > 
> > And please would you send the logs of the sshd server (with debug
> > options on) and the ssh client (with debug options on). And also the
> > kdc.log on that moment when you ssh.
> > 
> 
> # tail -15 /var/heimdal/log/kdc.log
> 2003-11-29T15:38:30 TGS-REQ touche@VPN.WWW from IPv4:192.168.2.5 for 
> host/etenemanki.touche.www@VPN.WWW
> 2003-11-29T15:38:30 sending 591 bytes to IPv4:192.168.2.5
> 2003-11-29T15:38:30 AS-REQ touche@VPN.WWW from IPv4:192.168.2.5 for 
> krbtgt/VPN.WWW@VPN.WWW
> 2003-11-29T15:38:30 Using des3-cbc-sha1/des3-cbc-sha1
> 2003-11-29T15:38:30 Requested flags: forwardable
> 2003-11-29T15:38:30 sending 560 bytes to IPv4:192.168.2.5
> 2003-11-29T15:38:30 TGS-REQ touche@VPN.WWW from IPv4:192.168.2.5 for 
> host/etenemanki.touche.www@VPN.WWW
> 2003-11-29T15:38:30 sending 591 bytes to IPv4:192.168.2.5
> 2003-11-29T15:40:14 AS-REQ touche@VPN.WWW from IPv4:192.168.2.5 for 
> krbtgt/VPN.WWW@VPN.WWW
> 2003-11-29T15:40:14 Using des3-cbc-sha1/des3-cbc-sha1
> 2003-11-29T15:40:14 Requested flags: forwardable
> 2003-11-29T15:40:14 sending 560 bytes to IPv4:192.168.2.5
> 
> ssh:
> ***
> $ ssh -vvv touche@etenemanki.vpn.www 2>log
> touche@etenemanki.vpn.www's password:
> $ more log
> OpenSSH_3.7.1, SSH protocols 1.5/2.0, OpenSSL 0.9.7b 10 Apr 2003
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug2: ssh_connect: needpriv 0
> debug1: Connecting to etenemanki.vpn.www [192.168.2.5] port 22.
> debug1: Connection established.
> debug1: identity file /home/touche/.ssh/identity type -1
> debug1: identity file /home/touche/.ssh/id_rsa type -1
> debug3: Not a RSA1 key file /home/touche/.ssh/id_dsa.
> debug2: key_type_from_name: unknown key type '-----BEGIN'
> debug3: key_read: missing keytype
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug3: key_read: missing whitespace
> debug2: key_type_from_name: unknown key type '-----END'
> debug3: key_read: missing keytype
> debug1: identity file /home/touche/.ssh/id_dsa type 2
> debug1: Remote protocol version 2.0, remote software version OpenSSH_3.7.1
> debug1: match: OpenSSH_3.7.1 pat OpenSSH*
> debug1: Enabling compatibility mode for protocol 2.0
> debug1: Local version string SSH-2.0-OpenSSH_3.7.1
> debug1: SSH2_MSG_KEXINIT sent
> debug1: SSH2_MSG_KEXINIT received
> debug2: kex_parse_kexinit: 
> diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
> debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
> debug2: kex_parse_kexinit: 
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysat
> or.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
> debug2: kex_parse_kexinit: 
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysat
> or.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
> debug2: kex_parse_kexinit: 
> hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
> debug2: kex_parse_kexinit: 
> hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
> debug2: kex_parse_kexinit: none,zlib
> debug2: kex_parse_kexinit: none,zlib
> debug2: kex_parse_kexinit:
> debug2: kex_parse_kexinit:
> debug2: kex_parse_kexinit: first_kex_follows 0
> debug2: kex_parse_kexinit: reserved 0
> debug2: kex_parse_kexinit: 
> diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
> debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
> debug2: kex_parse_kexinit: 
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysat
> or.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
> debug2: kex_parse_kexinit: 
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysat
> or.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
> debug2: kex_parse_kexinit: 
> hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
> debug2: kex_parse_kexinit: 
> hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
> debug2: kex_parse_kexinit: none,zlib
> debug2: kex_parse_kexinit: none,zlib
> debug2: kex_parse_kexinit:
> debug2: kex_parse_kexinit:
> debug2: kex_parse_kexinit: first_kex_follows 0
> debug2: kex_parse_kexinit: reserved 0
> debug2: mac_init: found hmac-md5
> debug1: kex: server->client aes128-cbc hmac-md5 none
> debug2: mac_init: found hmac-md5
> debug1: kex: client->server aes128-cbc hmac-md5 none
> debug1: SSH2_MSG_KEX_DH_GEX_REQUEST sent
> debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
> debug2: dh_gen_key: priv key bits set: 120/256
> debug2: bits set: 1554/3191
> debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
> debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
> debug3: check_host_in_hostfile: filename /home/touche/.ssh/known_hosts
> debug3: check_host_in_hostfile: match line 16
> debug3: check_host_in_hostfile: filename /home/touche/.ssh/known_hosts
> debug3: check_host_in_hostfile: match line 7
> debug1: Host 'etenemanki.vpn.www' is known and matches the RSA host key.
> debug1: Found key in /home/touche/.ssh/known_hosts:16
> debug2: bits set: 1588/3191
> debug1: ssh_rsa_verify: signature correct
> debug2: kex_derive_keys
> debug2: set_newkeys: mode 1
> debug1: SSH2_MSG_NEWKEYS sent
> debug1: expecting SSH2_MSG_NEWKEYS
> debug2: set_newkeys: mode 0
> debug1: SSH2_MSG_NEWKEYS received
> debug1: SSH2_MSG_SERVICE_REQUEST sent
> debug2: service_accept: ssh-userauth
> debug1: SSH2_MSG_SERVICE_ACCEPT received
> debug2: key: /home/touche/.ssh/identity (0x0)
> debug2: key: /home/touche/.ssh/id_rsa (0x0)
> debug2: key: /home/touche/.ssh/id_dsa (0x3c01fff0)
> debug1: Authentications that can continue: 
> publickey,password,keyboard-interactive
> debug3: start over, passed a different list 
> publickey,password,keyboard-interactive
> debug3: preferred gssapi,publickey,keyboard-interactive,password
> debug3: authmethod_lookup publickey
> debug3: remaining preferred: keyboard-interactive,password
> debug3: authmethod_is_enabled publickey
> debug1: Next authentication method: publickey
> debug1: Trying private key: /home/touche/.ssh/identity
> debug3: no such identity: /home/touche/.ssh/identity
> debug1: Trying private key: /home/touche/.ssh/id_rsa
> debug3: no such identity: /home/touche/.ssh/id_rsa
> debug1: Offering public key: /home/touche/.ssh/id_dsa
> debug3: send_pubkey_test
> debug2: we sent a publickey packet, wait for reply
> debug1: Authentications that can continue: 
> publickey,password,keyboard-interactive
> debug2: we did not send a packet, disable method
> debug3: authmethod_lookup keyboard-interactive
> debug3: remaining preferred: password
> debug3: authmethod_is_enabled keyboard-interactive
> debug1: Next authentication method: keyboard-interactive
> debug2: userauth_kbdint
> debug2: we sent a keyboard-interactive packet, wait for reply
> debug1: Authentications that can continue: 
> publickey,password,keyboard-interactive
> debug3: userauth_kbdint: disable: no info_req_seen
> debug2: we did not send a packet, disable method
> debug3: authmethod_lookup password
> debug3: remaining preferred:
> debug3: authmethod_is_enabled password
> debug1: Next authentication method: password
> ***
> 
> sshd -ddd :
> ***
> # /usr/sbin/sshd -ddd 2>log
> # more log
> debug2: read_server_config: filename /etc/ssh/sshd_config
> debug1: sshd version OpenSSH_3.7.1
> debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key.
> debug1: read PEM private key done: type RSA
> debug1: private host key: #0 type 1 RSA
> debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key.
> debug1: read PEM private key done: type DSA
> debug1: private host key: #1 type 2 DSA
> debug1: Bind to port 22 on ::.
> Server listening on :: port 22.
> debug1: Bind to port 22 on 0.0.0.0.
> Server listening on 0.0.0.0 port 22.
> debug1: Server will not fork when running in debugging mode.
> Connection from 192.168.2.5 port 31756
> debug1: Client protocol version 2.0; client software version OpenSSH_3.7.1
> debug1: match: OpenSSH_3.7.1 pat OpenSSH*
> debug1: Enabling compatibility mode for protocol 2.0
> debug1: Local version string SSH-2.0-OpenSSH_3.7.1
> debug2: Network child is on pid 28078
> debug3: preauth child monitor started
> debug3: mm_request_receive entering
> debug3: privsep user:group 27:27
> debug1: permanently_set_uid: 27/27
> debug1: list_hostkey_types: ssh-rsa,ssh-dss
> debug1: SSH2_MSG_KEXINIT sent
> debug1: SSH2_MSG_KEXINIT received
> debug2: kex_parse_kexinit: 
> diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
> debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
> debug2: kex_parse_kexinit: 
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysat
> or.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
> debug2: kex_parse_kexinit: 
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysat
> or.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
> debug2: kex_parse_kexinit: 
> hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
> debug2: kex_parse_kexinit: 
> hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
> debug2: kex_parse_kexinit: none,zlib
> debug2: kex_parse_kexinit: none,zlib
> debug2: kex_parse_kexinit:
> debug2: kex_parse_kexinit:
> debug2: kex_parse_kexinit: first_kex_follows 0
> debug2: kex_parse_kexinit: reserved 0
> debug2: kex_parse_kexinit: 
> diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
> debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
> debug2: kex_parse_kexinit: 
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysat
> or.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
> debug2: kex_parse_kexinit: 
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysat
> or.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
> debug2: kex_parse_kexinit: 
> hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
> debug2: kex_parse_kexinit: 
> hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
> debug2: kex_parse_kexinit: none,zlib
> debug2: kex_parse_kexinit: none,zlib
> debug2: kex_parse_kexinit:
> debug2: kex_parse_kexinit:
> debug2: kex_parse_kexinit: first_kex_follows 0
> debug2: kex_parse_kexinit: reserved 0
> debug2: mac_init: found hmac-md5
> debug1: kex: client->server aes128-cbc hmac-md5 none
> debug2: mac_init: found hmac-md5
> debug1: kex: server->client aes128-cbc hmac-md5 none
> debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received
> debug3: mm_request_send entering: type 0
> debug3: monitor_read: checking request 0
> debug3: mm_answer_moduli: got parameters: 1024 2048 8192
> debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI
> debug3: mm_request_receive_expect entering: type 1
> debug3: mm_request_receive entering
> debug3: mm_request_send entering: type 1
> debug3: mm_choose_dh: remaining 0
> debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
> debug2: monitor_read: 0 used once, disabling now
> debug3: mm_request_receive entering
> debug2: dh_gen_key: priv key bits set: 139/256
> debug2: bits set: 1588/3191
> debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
> debug2: bits set: 1554/3191
> debug3: mm_key_sign entering
> debug3: mm_request_send entering: type 4
> debug3: monitor_read: checking request 4
> debug3: mm_answer_sign
> debug3: mm_answer_sign: signature 0x3c029200(143)
> debug3: mm_request_send entering: type 5
> debug2: monitor_read: 4 used once, disabling now
> debug3: mm_request_receive entering
> debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN
> debug3: mm_request_receive_expect entering: type 5
> debug3: mm_request_receive entering
> debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent
> debug2: kex_derive_keys
> debug2: set_newkeys: mode 1
> debug1: SSH2_MSG_NEWKEYS sent
> debug1: expecting SSH2_MSG_NEWKEYS
> debug2: set_newkeys: mode 0
> debug1: SSH2_MSG_NEWKEYS received
> debug1: KEX done
> debug1: userauth-request for user touche service ssh-connection method none
> debug1: attempt 0 failures 0
> debug3: mm_getpwnamallow entering
> debug3: mm_request_send entering: type 6
> debug3: monitor_read: checking request 6
> debug3: mm_answer_pwnamallow
> debug3: Trying to reverse map address 192.168.2.5.
> debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM
> debug3: mm_request_receive_expect entering: type 7
> debug3: mm_request_receive entering
> debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
> debug3: mm_request_send entering: type 7
> debug2: input_userauth_request: setting up authctxt for touche
> debug3: mm_inform_authserv entering
> debug3: mm_request_send entering: type 3
> debug2: input_userauth_request: try method none
> debug3: mm_auth_password entering
> debug3: mm_request_send entering: type 10
> debug3: mm_auth_password: waiting for MONITOR_ANS_AUTHPASSWORD
> debug3: mm_request_receive_expect entering: type 11
> debug3: mm_request_receive entering
> debug2: monitor_read: 6 used once, disabling now
> debug3: mm_request_receive entering
> debug3: monitor_read: checking request 3
> debug3: mm_answer_authserv: service=ssh-connection, style=
> debug2: monitor_read: 3 used once, disabling now
> debug3: mm_request_receive entering
> debug3: monitor_read: checking request 10
> debug3: mm_answer_authpassword: sending result 0
> debug3: mm_request_send entering: type 11
> debug3: mm_auth_password: user not authenticated
> Failed none for touche from 192.168.2.5 port 31756 ssh2
> Failed none for touche from 192.168.2.5 port 31756 ssh2
> debug3: mm_request_receive entering
> debug1: userauth-request for user touche service ssh-connection method 
> publickey
> debug1: attempt 1 failures 1
> debug2: input_userauth_request: try method publickey
> debug1: test whether pkalg/pkblob are acceptable
> debug3: mm_key_allowed entering
> debug3: mm_request_send entering: type 20
> debug3: monitor_read: checking request 20
> debug3: mm_answer_keyallowed entering
> debug3: mm_answer_keyallowed: key_from_blob: 0x3c01f600
> debug1: temporarily_use_uid: 1000/1000 (e=0/0)
> debug1: trying public key file /home/touche/.ssh/authorized_keys
> debug1: restore_uid: 0/0
> debug1: temporarily_use_uid: 1000/1000 (e=0/0)
> debug1: trying public key file /home/touche/.ssh/authorized_keys2
> debug1: restore_uid: 0/0
> debug3: mm_answer_keyallowed: key 0x3c01f600 is disallowed
> debug3: mm_request_send entering: type 21
> debug3: mm_request_receive entering
> debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED
> debug3: mm_request_receive_expect entering: type 21
> debug3: mm_request_receive entering
> debug2: userauth_pubkey: authenticated 0 pkalg ssh-dss
> Failed publickey for touche from 192.168.2.5 port 31756 ssh2
> debug1: userauth-request for user touche service ssh-connection method 
> keyboard-interactive
> debug1: attempt 2 failures 2
> debug2: input_userauth_request: try method keyboard-interactive
> debug1: keyboard-interactive devs
> debug1: auth2_challenge: user=touche devs=
> debug1: kbdint_alloc: devices 'bsdauth'
> debug2: auth2_challenge_start: devices bsdauth
> debug2: kbdint_next_device: devices <empty>
> debug1: auth2_challenge_start: trying authentication method 'bsdauth'
> debug3: mm_bsdauth_query: entering
> debug3: mm_request_send entering: type 12
> debug3: monitor_read: checking request 12
> debug2: bsdauth_query: new bsd auth session
> debug3: bsdauth_query: style <default>
> debug3: mm_request_receive_expect entering: type 13
> debug3: mm_request_receive entering
> debug2: bsdauth_query: <empty>
> debug3: mm_answer_bsdauthquery: sending challenge success: 0
> debug3: mm_request_send entering: type 13
> debug3: mm_bsdauth_query: no challenge
> Failed keyboard-interactive for touche from 192.168.2.5 port 31756 ssh2
> debug3: mm_request_receive entering
> Connection closed by 192.168.2.5
> debug1: Calling cleanup 0x1c01edbc(0x0)
> ***
> 
> seems there is nowhere in debug where ssh speak kerberos.
> 
> note than, i only add "KerberosAuthentication yes" in sshd_config. 
> GSSAPIAuthentication is not needed, or yes ?
> 
> # more /etc/login.conf|grep auth-def|grep krb
> auth-defaults:auth=krb5-or-pwd:
> 
> 
> Regards
> 
> 		Julien
Follow-Ups:
- Re: ssh + kerberosV
  - From: Julien TOUCHE <julien.touche@lycos.com>
References:
- ssh + kerberosV
  - From: Julien TOUCHE <julien.touche@lycos.com>
- Re: ssh + kerberosV
  - From: Matthijs Mohlmann <matthijs@active2.homelinux.org>
- Re: ssh + kerberosV
  - From: Julien TOUCHE <julien.touche@lycos.com>
- Re: ssh + kerberosV
  - From: Matthijs Mohlmann <matthijs@active2.homelinux.org>
- Re: ssh + kerberosV
  - From: Julien TOUCHE <julien.touche@lycos.com>
- Re: ssh + kerberosV
  - From: Matthijs Mohlmann <matthijs@active2.homelinux.org>
- Re: ssh + kerberosV
  - From: Julien TOUCHE <julien.touche@lycos.com>
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