Hi,
I'm using the openssh-server (4.2p1-5) package under Debian which contains
openssh 4.2 with the GSSAPI patch.
I'm trying to use a kerberos ticket (obtained with kinit) to ssh into a
server without having to type any password (and without using ssh keys)
However, the closest I have come to this, is that the server asks me for
my kerberos password and then auhenticates with the kdc using my
password.
My full sshd_config (server) is this :
Port 22
Protocol 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
UsePrivilegeSeparation yes
KeyRegenerationInterval 3600
ServerKeyBits 768
SyslogFacility AUTH
LogLevel INFO
LoginGraceTime 600
PermitRootLogin yes
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no
PermitEmptyPasswords no
PasswordAuthentication no
GSSAPICleanupCredentials yes
GSSAPIAuthentication yes
X11Forwarding no
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
KeepAlive yes
Subsystem sftp /usr/lib/openssh/sftp-server
UsePAM yes
my full ssh_config (client) is this:
Host *
SendEnv LANG LC_*
HashKnownHosts yes
GSSAPIAuthentication yes
GSSAPIDelegateCredentials yes
On the KDC, I have a principal for my user and for the host I want to ssh into
This is what I get when I try to login (bella is the client, dhcp-103 is the
server, u0036393 is the user):
deepstar@bella:~$ klist
Credentials cache: FILE:/tmp/krb5cc_1000
Principal: u0036393@KULEUVEN.BE
Issued Expires Principal
Oct 28 09:40:06 Oct 28 19:40:04 krbtgt/KULEUVEN.BE@KULEUVEN.BE
Oct 28 09:40:06 Oct 28 19:40:04 krbtgt/KULEUVEN.BE@KULEUVEN.BE
Oct 28 09:40:30 Oct 28 19:40:04 host/dhcp-103.kulnet-l@KULEUVEN.BE
V4-ticket file: /tmp/tkt1000
klist: No ticket file (tf_util)
deepstar@bella:~$ ssh -vvv u0036393@dhcp-103.kulnet-l
OpenSSH_4.2p1 Debian-5, OpenSSL 0.9.8a 11 Oct 2005
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to dhcp-103.kulnet-l [192.168.2.103] port 22.
debug1: Connection established.
debug1: identity file /home/deepstar/.ssh/identity type -1
debug1: identity file /home/deepstar/.ssh/id_rsa type -1
debug1: identity file /home/deepstar/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.2p1
Debian-5
debug1: match: OpenSSH_4.2p1 Debian-5 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.2p1 Debian-5
debug2: fd 3 setting O_NONBLOCK
debug3: Trying to reverse map address 192.168.2.103.
debug1: Offering GSSAPI proposal:
gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group1-sha1-A/vxljAEU54gt9a48EiANQ==
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit:
gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group1-sha1-A/vxljAEU54gt9a48EiANQ==,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,null
debug2: kex_parse_kexinit:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.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@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@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-sha1,diffie-hellman-group14-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,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.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@openssh.com
debug2: kex_parse_kexinit: none,zlib@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_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(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 117/256
debug2: bits set: 504/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/deepstar/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 11
debug3: check_host_in_hostfile: filename /home/deepstar/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 9
debug1: Host 'dhcp-103.kulnet-l' is known and matches the RSA host key.
debug1: Found key in /home/deepstar/.ssh/known_hosts:11
debug2: bits set: 500/1024
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/deepstar/.ssh/identity ((nil))
debug2: key: /home/deepstar/.ssh/id_rsa ((nil))
debug2: key: /home/deepstar/.ssh/id_dsa ((nil))
debug1: Authentications that can continue:
publickey,gssapi-keyx,gssapi-with-mic,keyboard-interactive
debug3: start over, passed a different list
publickey,gssapi-keyx,gssapi-with-mic,keyboard-interactive
debug3: preferred
gssapi-keyx,gssapi-with-mic,gssapi,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-keyx
debug3: remaining preferred:
gssapi-with-mic,gssapi,publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-keyx
debug1: Next authentication method: gssapi-keyx
debug1: No valid Key exchange context
debug2: we did not send a packet, disable method
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: gssapi,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-keyx,gssapi-with-mic,keyboard-interactive
debug2: we sent a gssapi-with-mic packet, wait for reply
debug1: Authentications that can continue:
publickey,gssapi-keyx,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/deepstar/.ssh/identity
debug3: no such identity: /home/deepstar/.ssh/identity
debug1: Trying private key: /home/deepstar/.ssh/id_rsa
debug3: no such identity: /home/deepstar/.ssh/id_rsa
debug1: Trying private key: /home/deepstar/.ssh/id_dsa
debug3: no such identity: /home/deepstar/.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 for u0036393@KULEUVEN.BE:
The problem is probably here:
debug1: Next authentication method: gssapi-keyx
debug1: No valid Key exchange context
debug2: we did not send a packet, disable method
Althrough I have no idea what is causing it.
I would appreciate any help to get this working.
Also, some documentation on how this can be accomplished would be very nice.
(If there already is such documentation, it would be helpful if it was in a
more accesible place and if it could be found through google :)
thanks in advance
greets,
-- Steven
