Hi IPA Users,
I'm attempting to setup Single Sign On (SSO) with SSH in an IPA domain. I'd like
to allow users who already have a Kerberos ticket to be allowed to SSH around the network
without being prompted for a password. I have the following configuration:
/etc/ssh/sshd_config has:
GSSAPIAuthentication yes
GSSAPICleanupCredentials yes
/etc/ssh/ssh_config has:
Host *
GSSAPIAuthentication yes
GSSAPIDelegateCredentials yes
Here is the output I'm seeing:
[testuser@testclient1 ssh]$ klist -f
Ticket cache: KEYRING:persistent:1234:krb_ccache_skEebtp
Default principal: testuser(a)EXAMPLE.COM
Valid starting Expires Service principal
08/06/2018 11:02:26 08/07/2018 11:01:22 host/testclient2.example.com(a)EXAMPLE.COM
Flags: FAT
08/06/2018 11:01:55 08/07/2018 11:01:22 host/testclient2(a)EXAMPLE.COM
Flags: FAT
08/06/2018 11:01:55 08/07/2018 11:01:22 host/testclient2@
Flags: FAT
08/06/2018 11:01:22 08/07/2018 11:01:22 krbtgt/example.com(a)EXAMPLE.COM
Flags: FIA
[testuser@testclient1 ssh]$ ssh -vvv
testclient2.example.com
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 60: Applying options for *
debug1: Executing proxy command: exec /usr/bin/sss_ssh_knownhostsproxy -p 22
testclient2.example.com
debug1: key_load_public: No such file or directory
debug1: identity file /home/testuser/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/testuser/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/testuser/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/testuser/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/testuser/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/testuser/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/testuser/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/testuser/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: permanently_drop_suid: 1234
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug2: fd 6 setting O_NONBLOCK
debug2: fd 5 setting O_NONBLOCK
debug1: Authenticating to testclient2.example.com:22 as 'testuser'
debug3: hostkeys_foreach: reading file "/var/lib/sss/pubconf/known_hosts"
debug3: record_hostkey: found key type RSA in file /var/lib/sss/pubconf/known_hosts:1
debug3: record_hostkey: found key type RSA in file /var/lib/sss/pubconf/known_hosts:3
debug3: record_hostkey: found key type ECDSA in file /var/lib/sss/pubconf/known_hosts:4
debug3: record_hostkey: found key type ECDSA in file /var/lib/sss/pubconf/known_hosts:6
debug3: record_hostkey: found key type ED25519 in file /var/lib/sss/pubconf/known_hosts:7
debug3: record_hostkey: found key type ED25519 in file /var/lib/sss/pubconf/known_hosts:9
debug3: load_hostkeys: loaded 6 keys from
testclient2.example.com
debug3: order_hostkeyalgs: prefer hostkeyalgs:
ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms:
curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,ext-info-c
debug2: host key algorithms:
ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-dss-cert-v01(a)openssh.com,ssh-dss
debug2: ciphers ctos:
chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm(a)openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc:
chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm(a)openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos:
umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128(a)openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc:
umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128(a)openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib(a)openssh.com,zlib
debug2: compression stoc: none,zlib(a)openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms:
curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms:
ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos:
chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: ciphers stoc:
chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: MACs ctos:
umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128(a)openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc:
umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128(a)openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib(a)openssh.com
debug2: compression stoc: none,zlib(a)openssh.com
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305(a)openssh.com MAC: <implicit>
compression: none
debug1: kex: client->server cipher: chacha20-poly1305(a)openssh.com MAC: <implicit>
compression: none
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256
SHA256:04F5INVrYOenS32GxvfsU8o8z70Fta/J7alUuSG+KpE
debug3: hostkeys_foreach: reading file "/var/lib/sss/pubconf/known_hosts"
debug3: record_hostkey: found key type RSA in file /var/lib/sss/pubconf/known_hosts:1
debug3: record_hostkey: found key type RSA in file /var/lib/sss/pubconf/known_hosts:3
debug3: record_hostkey: found key type ECDSA in file /var/lib/sss/pubconf/known_hosts:4
debug3: record_hostkey: found key type ECDSA in file /var/lib/sss/pubconf/known_hosts:6
debug3: record_hostkey: found key type ED25519 in file /var/lib/sss/pubconf/known_hosts:7
debug3: record_hostkey: found key type ED25519 in file /var/lib/sss/pubconf/known_hosts:9
debug3: load_hostkeys: loaded 6 keys from
testclient2.example.com
debug1: Host 'testclient2.example.com' is known and matches the ECDSA host key.
debug1: Found key in /var/lib/sss/pubconf/known_hosts:4
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /home/testuser/.ssh/id_rsa ((nil))
debug2: key: /home/testuser/.ssh/id_dsa ((nil))
debug2: key: /home/testuser/.ssh/id_ecdsa ((nil))
debug2: key: /home/testuser/.ssh/id_ed25519 ((nil))
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue:
publickey,gssapi-keyex,gssapi-with-mic,password,keyboard-interactive
debug3: start over, passed a different list
publickey,gssapi-keyex,gssapi-with-mic,password,keyboard-interactive
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-keyex
debug3: remaining preferred: gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-keyex
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug2: we did not send a packet, disable method
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
debug3: send packet: type 50
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue:
publickey,gssapi-keyex,gssapi-with-mic,password,keyboard-interactive
debug3: send packet: type 50
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue:
publickey,gssapi-keyex,gssapi-with-mic,password,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/testuser/.ssh/id_rsa
debug3: no such identity: /home/testuser/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/testuser/.ssh/id_dsa
debug3: no such identity: /home/testuser/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/testuser/.ssh/id_ecdsa
debug3: no such identity: /home/testuser/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/testuser/.ssh/id_ed25519
debug3: no such identity: /home/testuser/.ssh/id_ed25519: No such file or directory
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
debug3: send packet: type 50
debug2: we sent a keyboard-interactive packet, wait for reply
debug3: receive packet: type 60
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password:
Any tips for troubleshooting this?
Thanks,
Ryan