openssh + kerberos + windows ad

[Marcello Mezzanotti]

Hi all,

im not sure if its the correct list but,

Im trying to do kind of SSO, basically, i want to ssh a remote linux
machine, using openssh/putty (what version), without password prompt,
just with kerberos ticket.

I have the following scenario:

Windows Server 2003 R2 (with Unix Services installed), its the DC of my domain
Linux OpenSUSE 11.2, i configured it to do krb5/ldap autenticantion
against my DC, its working fine, i can login remotely and localy with
my AD credentials and its working fine, as you can see bellow:

login as: mmezzanotti
Using keyboard-interactive authentication.
Password:
Last login: Wed Dec 30 14:00:19 2009 from localhost
Have a lot of fun...
mmezzanotti at os112:~> ls
bin      Documents  Music     Public       Templates
Desktop  Download   Pictures  public_html  Videos
mmezzanotti at os112:~> klist
Ticket cache: FILE:/tmp/krb5cc_10002_b8QDZx
Default principal: mmezzanotti at VMWARELAB.INT

Valid starting     Expires            Service principal
01/04/10 13:58:36  01/04/10 23:58:37  krbtgt/VMWARELAB.INT at VMWARELAB.INT
       renew until 01/05/10 13:58:36
mmezzanotti at os112:~>


this linux machine in on my AD domain and i have a valid krb ticket.

im trying to use ssh to connect to this server, but i want to use my
krb ticket, not type password.

i have enabled gss api options in my sshd.config.
# GSSAPI options
GSSAPIAuthentication yes
GSSAPICleanupCredentials yes


restarted opensshd but it doesnt work:

mmezzanotti at os112:~> ssh -vvv mmezzanotti at os112.vmwarelab.int
OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to os112.vmwarelab.int [192.168.86.14] port 22.
debug1: Connection established.
debug1: identity file /home/mmezzanotti/.ssh/id_rsa type -1
debug1: identity file /home/mmezzanotti/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2
debug1: match: OpenSSH_5.2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.2
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit:
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib at openssh.com,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-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib at openssh.com
debug2: kex_parse_kexinit: none,zlib at openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 130/256
debug2: bits set: 513/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/mmezzanotti/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 3
debug3: check_host_in_hostfile: filename /home/mmezzanotti/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 3
debug1: Host 'os112.vmwarelab.int' is known and matches the RSA host key.
debug1: Found key in /home/mmezzanotti/.ssh/known_hosts:3
debug2: bits set: 512/1024
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/mmezzanotti/.ssh/id_rsa ((nil))
debug2: key: /home/mmezzanotti/.ssh/id_dsa ((nil))
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug3: start over, passed a different list
publickey,gssapi-with-mic,keyboard-interactive
debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
debug1: Next authentication method: gssapi-with-mic
debug2: we sent a gssapi-with-mic packet, wait for reply
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug2: we sent a gssapi-with-mic packet, wait for reply
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug2: we sent a gssapi-with-mic packet, wait for reply
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug2: we did not send a packet, disable method
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/mmezzanotti/.ssh/id_rsa
debug3: no such identity: /home/mmezzanotti/.ssh/id_rsa
debug1: Trying private key: /home/mmezzanotti/.ssh/id_dsa
debug3: no such identity: /home/mmezzanotti/.ssh/id_dsa
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
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password:
debug3: packet_send2: adding 32 (len 14 padlen 18 extra_pad 64)
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password:
debug3: packet_send2: adding 32 (len 14 padlen 18 extra_pad 64)
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password:
debug3: packet_send2: adding 32 (len 14 padlen 18 extra_pad 64)
Received disconnect from 192.168.86.14: 2: Too many authentication
failures for mmezzanotti


bellow the lines about gssapi auth:

debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
debug1: Next authentication method: gssapi-with-mic
debug2: we sent a gssapi-with-mic packet, wait for reply
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug2: we sent a gssapi-with-mic packet, wait for reply
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug2: we sent a gssapi-with-mic packet, wait for reply
debug1: Authentications that can continue:
publickey,gssapi-with-mic,keyboard-interactive
debug2: we did not send a packet, disable method

anyone could help me?

another question, i downloaded a lot of patched putty clients with
gssapi support (to use on windows machines), what is the correct one?

thank you,
Marcello

--
Marcello Mezzanotti <marcello.mezzanotti at gmail.com>
http://blogdomarcello.wordpress.com
Information Security
UNIX / Linux / *BSD