On 15 Oct 2019, at 17:49, Rob Crittenden <[email protected]<mailto:[email protected]>> wrote:
Vinícius Ferrão wrote: Hi Rob On 15 Oct 2019, at 10:22, Rob Crittenden <[email protected]<mailto:[email protected]> <mailto:[email protected]>> wrote: Vinícius Ferrão via FreeIPA-users wrote: Hello, I’m trying to implement SSH Hostbased Authentication between IPA joined machines but I’m with difficulties regarding: * The /etc/ssh/ssh_known_hosts file. In a FreeIPA environment the known_hosts are stored on IPA, and I’m aware of the ProxyCommand /usr/bin/sss_ssh_knownhostsproxy; but how can I create this file with the entries from FreeIPA? Why do you want to? That is the point of the proxy, so dynamic files don't need to be maintained. Because it appears to be a requirement. Unfortunately SSH does not look at /var/lib/sss/pubconf/known_hosts: debug1: userauth_hostbased: cuser admin chost hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br>. pkalg ecdsa-sha2-nistp256 slen 100 [preauth] debug3: mm_key_allowed entering [preauth] debug3: mm_request_send entering: type 22 [preauth] debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED [preauth] debug3: mm_request_receive_expect entering: type 23 [preauth] debug3: mm_request_receive entering [preauth] debug3: mm_request_receive entering debug3: monitor_read: checking request 22 debug3: mm_answer_keyallowed entering debug3: mm_answer_keyallowed: key_from_blob: 0x561842345040 debug2: hostbased_key_allowed: chost hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br>. resolvedname hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br> ipaddr 172.26.0.1 debug2: stripping trailing dot from chost hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br>. debug2: auth_rhosts2: clientuser admin hostname hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br> ipaddr 172.26.0.1 debug1: temporarily_use_uid: 1683000000/1683000000 (e=0/0) debug1: restore_uid: 0/0 debug1: fd 8 clearing O_NONBLOCK debug2: hostbased_key_allowed: access allowed by auth_rhosts2 debug1: temporarily_use_uid: 1683000000/1683000000 (e=0/0) debug1: restore_uid: 0/0 debug1: check_key_in_hostfiles: key for host hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br> not found debug1: temporarily_use_uid: 1683000000/1683000000 (e=0/0) debug1: restore_uid: 0/0 debug1: check_key_in_hostfiles: key for host hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br> not found debug3: mm_answer_keyallowed: key 0x561842345040 is not allowed Failed hostbased for admin from 172.26.0.1 port 55634 ssh2: ECDSA SHA256:wJ0OVmkiVnMjuoiRe5sdBVz5sMTTKIbYRWorTk+CnUQ, client user "admin", client host "hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br>” It does for me: debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts" debug3: hostkeys_foreach: reading file "/var/lib/sss/pubconf/known_hosts" debug3: record_hostkey: found key type ED25519 in file /var/lib/sss/pubconf/known_hosts:2 debug3: record_hostkey: found key type RSA 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 The client only pushes the SSHFP records on enrollment if IPA is serving DNS. Rob, I’m not sure if we are talking about the same thing. In fact this part works for me too: debug1: Authenticating to hpclab03:22 as 'root' debug3: hostkeys_foreach: reading file "/var/lib/sss/pubconf/known_hosts" debug3: record_hostkey: found key type ED25519 in file /var/lib/sss/pubconf/known_hosts:2 debug3: record_hostkey: found key type ECDSA in file /var/lib/sss/pubconf/known_hosts:4 debug3: record_hostkey: found key type RSA in file /var/lib/sss/pubconf/known_hosts:6 debug3: load_hostkeys: loaded 3 keys from hpclab03 But it’s not here the problem. The problem is when starting HBA (Hostbased Authentication). debug1: Next authentication method: hostbased Here is the problem: debug3: userauth_hostbased: trying key type [email protected]<mailto:[email protected]> debug3: userauth_hostbased: trying key type [email protected]<mailto:[email protected]> debug3: userauth_hostbased: trying key type [email protected]<mailto:[email protected]> debug3: userauth_hostbased: trying key type [email protected]<mailto:[email protected]> debug3: userauth_hostbased: trying key type [email protected]<mailto:[email protected]> debug3: userauth_hostbased: trying key type [email protected]<mailto:[email protected]> debug3: userauth_hostbased: trying key type ecdsa-sha2-nistp256 debug1: userauth_hostbased: trying hostkey ecdsa-sha2-nistp256 SHA256:Nwwv7gndOGwipEM3I8AGQEUX7OP9LvgFG0V7TXJ0XcI debug2: userauth_hostbased: chost hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br>. debug3: send packet: type 50 debug2: we sent a hostbased packet, wait for reply debug3: receive packet: type 51 debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,keyboard-interactive,hostbased debug3: userauth_hostbased: trying key type ecdsa-sha2-nistp256 debug3: userauth_hostbased: trying key type ecdsa-sha2-nistp384 debug3: userauth_hostbased: trying key type ecdsa-sha2-nistp521 debug3: userauth_hostbased: trying key type ssh-ed25519 debug1: userauth_hostbased: trying hostkey ssh-ed25519 SHA256:9O5hkM8gLvGPcoZE9t5zbGxAxHGq7RsCZ5ScjltBZpQ debug2: userauth_hostbased: chost hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br>. debug3: send packet: type 50 debug2: we sent a hostbased packet, wait for reply debug3: receive packet: type 51 debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,keyboard-interactive,hostbased debug3: userauth_hostbased: trying key type ssh-ed25519 debug3: userauth_hostbased: trying key type rsa-sha2-512 debug3: userauth_hostbased: trying key type rsa-sha2-256 debug3: userauth_hostbased: trying key type ssh-rsa debug1: userauth_hostbased: trying hostkey ssh-rsa SHA256:+Zl4g2C+AALTHr0K/qkcSDkU6wVQ+CygatAn7x9bRUI debug2: userauth_hostbased: chost hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br>. debug3: send packet: type 50 debug2: we sent a hostbased packet, wait for reply debug3: receive packet: type 51 debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,keyboard-interactive,hostbased debug3: userauth_hostbased: trying key type ssh-rsa debug3: userauth_hostbased: trying key type ssh-dss debug1: No more client hostkeys for hostbased authentication. If I manually create the file: /etc/ssh/ssh_known_hosts with the entries it works, so it’s definitely not looking in /var/lib/sss/pubconf/known_hosts or the proxy isn’t being called during HBA. If it’s still not clear what I mean I can try to rephrase it. Thanks again. rob If you look at the sshd log there is this: debug1: check_key_in_hostfiles: key for host hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br> not found But if I create the file manually it will work: debug1: check_key_in_hostfiles: key for hpclab01.cluster.iq.ufrj.br<http://hpclab01.cluster.iq.ufrj.br> <http://hpclab01.cluster.iq.ufrj.br> found at /etc/ssh/ssh_known_hosts:1 Any ideias? * Another issue is with the /etc/ssh/shosts.equiv file. It supports plain hostnames or netgroups, which is a NIS thing. FreeIPA offers any netgroups compatibility? I’m expecting to put something like: @nodes on this file to keep it simple. Any changes on IPA hosts would be reflected automatically. IPA hostgroups are automatically mirrored as netgroups. Nice, this worked flawlessly!!! rob Thank you very much. V.
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