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OpenSSH + Kerberos SSO：Host /localhost.localdomainのキーテーブルエントリが見つかりません

SSOがOpenSSHで機能しない-GSSAPIAuthenticationをKerberosで機能させることができませんでした。ログインしようとするたびに、パスワードの入力を求められ続けました。

トラブルシューティング中に、ここでデバッグを開始しました。

[foster@kvm0007 ~]$ kinit
Password for [email protected]: 
[foster@kvm0007 ~]$ ssh -p222 -K [email protected] -vvv
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /home/users/foster/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to kerberos.monzell.com [192.168.15.100] port 222.
debug1: Connection established.
debug1: identity file /home/users/foster/.ssh/identity type -1
debug1: identity file /home/users/foster/.ssh/id_rsa type -1
debug3: Not a RSA1 key file /home/users/foster/.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/users/foster/.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug3: Wrote 792 bytes for a total of 813
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,[email protected]
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,[email protected]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit: none,[email protected],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,[email protected]
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,[email protected]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: none,[email protected]
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
debug3: Wrote 24 bytes for a total of 837
debug2: dh_gen_key: priv key bits set: 132/256
debug2: bits set: 499/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: Wrote 144 bytes for a total of 981
debug3: put_Host_port: [192.168.15.100]:222
debug3: put_Host_port: [kerberos.monzell.com]:222
debug3: check_Host_in_hostfile: filename /home/users/foster/.ssh/known_hosts
debug3: check_Host_in_hostfile: filename /etc/ssh/ssh_known_hosts
debug3: check_Host_in_hostfile: filename /home/users/foster/.ssh/known_hosts
debug3: check_Host_in_hostfile: filename /etc/ssh/ssh_known_hosts
debug1: checking without port identifier
debug3: check_Host_in_hostfile: filename /home/users/foster/.ssh/known_hosts
debug3: check_Host_in_hostfile: match line 1
debug3: check_Host_in_hostfile: filename /home/users/foster/.ssh/known_hosts
debug3: check_Host_in_hostfile: match line 1
debug1: Host 'kerberos.monzell.com' is known and matches the RSA Host key.
debug1: Found key in /home/users/foster/.ssh/known_hosts:1
debug1: found matching key w/out port
debug2: bits set: 505/1024
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
debug3: Wrote 16 bytes for a total of 997
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug3: Wrote 48 bytes for a total of 1045
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/users/foster/.ssh/identity ((nil))
debug2: key: /home/users/foster/.ssh/id_rsa ((nil))
debug2: key: /home/users/foster/.ssh/id_dsa (0x7fed559e5d30)
debug3: Wrote 64 bytes for a total of 1109
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
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
debug3: Trying to reverse map address 192.168.15.100.
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: Wrote 96 bytes for a total of 1205
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: Wrote 96 bytes for a total of 1301
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: Wrote 96 bytes for a total of 1397
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: Wrote 96 bytes for a total of 1493
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
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/users/foster/.ssh/identity
debug3: no such identity: /home/users/foster/.ssh/identity
debug1: Trying private key: /home/users/foster/.ssh/id_rsa
debug3: no such identity: /home/users/foster/.ssh/id_rsa
debug1: Offering public key: /home/users/foster/.ssh/id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug3: Wrote 528 bytes for a total of 2021
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
[email protected]'s password:

ご覧のとおり、gssapi-with-micが送信されていますが、命令可能な応答はありません。

結局のところ、これはKDCに送信されていたようです。

debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug1: userauth-request for user foster service ssh-connection method none
debug1: attempt 0 failures 0
debug1: PAM: initializing for "foster"
debug1: PAM: setting PAM_RHOST to "192.168.15.37"
debug1: PAM: setting PAM_TTY to "ssh"
debug1: userauth-request for user foster service ssh-connection method gssapi-with-mic
debug1: attempt 1 failures 0
debug1: Unspecified GSS failure.  Minor code may provide more information
**No key table entry found for Host/[email protected]**

debug1: userauth-request for user foster service ssh-connection method gssapi-with-mic
debug1: attempt 2 failures 0
debug1: userauth-request for user foster service ssh-connection method gssapi-with-mic
debug1: attempt 3 failures 0
debug1: userauth-request for user foster service ssh-connection method gssapi-with-mic
debug1: attempt 4 failures 0
debug1: userauth-request for user foster service ssh-connection method publickey
debug1: attempt 5 failures 0
debug1: test whether pkalg/pkblob are acceptable
debug1: temporarily_use_uid: 502/502 (e=0/0)
debug1: trying public key file /home/users/foster/.ssh/authorized_keys
debug1: restore_uid: 0/0
debug1: temporarily_use_uid: 502/502 (e=0/0)
debug1: trying public key file /home/users/foster/.ssh/authorized_keys2
debug1: restore_uid: 0/0

いくつかの調査では、ホストファイルに問題がある可能性があることが示されています。これは次のとおりです。

[foster@sl6 ~]$ cat /etc/hosts
127.0.0.1       localhost.localdomain   localhost
::1     sl6     localhost6.localdomain6 localhost6
192.168.15.100  kerberos.monzell.com kerberos
192.168.15.100 monzell.com
192.168.15.31   kvm0001.monzell.com     kvm0001

ホストにホスト名マニュアルを設定しようとしましたが、効果がありませんでした。

KDCのプリンシパルのリストは次のとおりです。

[root@sl6 ~]# kadmin.local
Authenticating as principal rilindo/[email protected] with password.
kadmin.local:  listprincs
K/[email protected]
[email protected]
Host/[email protected]
Host/[email protected]
[email protected]
kadmin/[email protected]
kadmin/[email protected]
kadmin/[email protected]
krbtgt/[email protected]
[email protected]
rilindo/[email protected]
[email protected]

Kerberosがほとんどの認証を行います。ユーザーディレクトリはOpenLDAPにあります。クライアントとサーバーの両方がScientificLinux 6.1を実行しており、クライアントはサーバー上でVM）として実行されています。

ここに示すように、KerberosがOpenSSHの外部で機能することを確認できます。

[foster@kvm0007 ~]$ /usr/kerberos/bin/krsh -x -PN kerberos.monzell.com
This rlogin session is encrypting all data transmissions.
Last login: Sun Sep 25 21:18:20 from 192.168.15.37

問題のユーザーは、次のssh構成ファイルを持っています。

[foster@sl6 ~]$ cat .ssh/config 
GSSAPIAuthentication yes
GSSAPIDelegateCredentials yes
GSSAPITrustDns yes

この時点からどの方向に進むべきですか？

編集：私はこの投稿に何かを追加するのを忘れていることを知っていました。サーバー上のkrb5.confは次のとおりです。

[root@sl6 ~]# cat /etc/krb5.conf
[logging]
 default = FILE:/var/log/krb5libs.log
 kdc = FILE:/var/log/krb5kdc.log
 admin_server = FILE:/var/log/kadmind.log

[libdefaults]
 default_realm = MONZELL.COM
 dns_lookup_realm = false
 dns_lookup_kdc = false
 ticket_lifetime = 24h
 renew_lifetime = 7d
 forwardable = true

[realms]
 MONZELL.COM = {
  kdc = kerberos.monzell.com
  admin_server = kerberos.monzell.com
 }

[domain_realm]
 .monzell.com = MONZELL.COM
 monzell.com = MONZELL.COM

そしてクライアント上で：

[rilindo@kvm0007 ~]$ cat /etc/krb5.conf
[logging]
 default = FILE:/var/log/krb5libs.log
 kdc = FILE:/var/log/krb5kdc.log
 admin_server = FILE:/var/log/kadmind.log

[libdefaults]
 default_realm = MONZELL.COM
 dns_lookup_realm = false
 dns_lookup_kdc = false
 ticket_lifetime = 24h
 renew_lifetime = 7d
 forwardable = true

[realms]
 EXAMPLE.COM = {
  kdc = kerberos.example.com
  admin_server = kerberos.example.com
 }

 MONZELL.COM = {
  kdc = kerberos.monzell.com
  admin_server = kerberos.monzell.com
 }

[domain_realm]
 .example.com = EXAMPLE.COM
 example.com = EXAMPLE.COM
 monzell.com = MONZELL.COM
 .monzell.com = MONZELL.COM
sshkerberossingle-sign-ongssapiscientific-linux
2
Rilindo

単純なホスト名の問題またはドメインレルムマッピングの問題である可能性があります。
（おそらく最初のものですが、完全を期すために両方をここに示します。）

ホスト名の問題
hostname -f on kerberos.monzell.com
次を返す必要があります：kerberos.monzell.com
notreturn：localhost.localdomain

ドメインレルムマッピングの問題
Dig -t txt _kerberos.kerberos.monzell.com
Dig -t txt _kerberos.monzell.com

使用したくない場合は/etc/krb5.confを返す必要があります
<record> <ttl num> IN TXT "MONZELL.COM".

ただし、hostsファイルが与えられた場合、これはおそらく当てはまりません。
/etc/krb5.confには、次のいずれかを含める必要があります。

[domain_realm]
。monzell.comMONZELL.COM

または

[domain_realm]
kerberos.monzell.com MONZELL.COM

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