ssh key based access


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On my primary workstation (macbook) I used ssh-copy-id to copy my key to unraid and I can now login without a password as expected.

However, when I do the same thing from a debian vm (or raspberry pi), ssh-copy-id succeeds but it still prompts me for a password.

 

Can anyone see what I'm doing wrong? Kinda stumped.

 

parallels@debian-gnu-linux-10:~$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/parallels/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/parallels/.ssh/id_rsa.
Your public key has been saved in /home/parallels/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:REDACTED parallels@debian-gnu-linux-10
The key's randomart image is:
+---[RSA 2048]----+
|       ....++ o+o|
|      . o.+..o=o.|
|      REDACTED  .|
|      .  .+ B B .|
|        So * X oo|
|       .. + E B=o|
|         . o +o*.|
|            o o  |
|             .   |
+----[SHA256]-----+
parallels@debian-gnu-linux-10:~$ ssh-copy-id root@unraid
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@unraid's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@unraid'"
and check to make sure that only the key(s) you wanted were added.

parallels@debian-gnu-linux-10:~$ ssh root@unriad
root@unraid's password: 

 

and here's the debug ssh connection

 

parallels@debian-gnu-linux-10:~$ ssh root@unraid -vvvvv
OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d  10 Sep 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "unraid" port 22
debug2: ssh_connect_direct
debug1: Connecting to unraid [192.168.1.250] port 22.
debug1: Connection established.
debug1: identity file /home/parallels/.ssh/id_rsa type 0
debug1: identity file /home/parallels/.ssh/id_rsa-cert type -1
debug1: identity file /home/parallels/.ssh/id_dsa type -1
debug1: identity file /home/parallels/.ssh/id_dsa-cert type -1
debug1: identity file /home/parallels/.ssh/id_ecdsa type -1
debug1: identity file /home/parallels/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/parallels/.ssh/id_ed25519 type -1
debug1: identity file /home/parallels/.ssh/id_ed25519-cert type -1
debug1: identity file /home/parallels/.ssh/id_xmss type -1
debug1: identity file /home/parallels/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.8
debug1: match: OpenSSH_8.8 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to unraid:22 as 'root'
debug3: hostkeys_foreach: reading file "/home/parallels/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/parallels/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from unraid
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
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,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],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,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
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: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
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:BYjksZkr04Z0Tywa/zTShZM8Ddm5nEqs8mE9aCmLQnI
debug3: hostkeys_foreach: reading file "/home/parallels/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/parallels/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from unraid
debug3: hostkeys_foreach: reading file "/home/parallels/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/parallels/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from 192.168.1.250
debug1: Host 'unraid' is known and matches the ECDSA host key.
debug1: Found key in /home/parallels/.ssh/known_hosts:1
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
debug1: Will attempt key: /home/parallels/.ssh/id_rsa RSA SHA256:VnVHD2np+AZLN4O/UD5nk2YF7otDBNIhuPUzUcOr2HY agent
debug1: Will attempt key: /home/parallels/.ssh/id_dsa 
debug1: Will attempt key: /home/parallels/.ssh/id_ecdsa 
debug1: Will attempt key: /home/parallels/.ssh/id_ed25519 
debug1: Will attempt key: /home/parallels/.ssh/id_xmss 
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,sk-ssh-ed25519@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@openssh.com,webauthn-sk-ecdsa-sha2-nistp256@openssh.com>
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,password,keyboard-interactive
debug3: start over, passed a different list publickey,password,keyboard-interactive
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/parallels/.ssh/id_rsa RSA SHA256:VnVHD2np+AZLN4O/UD5nk2YF7otDBNIhuPUzUcOr2HY agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Trying private key: /home/parallels/.ssh/id_dsa
debug3: no such identity: /home/parallels/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/parallels/.ssh/id_ecdsa
debug3: no such identity: /home/parallels/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/parallels/.ssh/id_ed25519
debug3: no such identity: /home/parallels/.ssh/id_ed25519: No such file or directory
debug1: Trying private key: /home/parallels/.ssh/id_xmss
debug3: no such identity: /home/parallels/.ssh/id_xmss: 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 51
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug3: userauth_kbdint: disable: no info_req_seen
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: 
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
root@unraid's password: 

 

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To answer my own question ....SSHD uses this file to check SSH keys:

 

/etc/ssh/root.pubkeys

 

Don't use ssh-copy-id as it copies the keys to /root/.ssh/authorized_keys which (on my unraid server v6.10.0-rc5) is ignored by SSHD.

 

I'm assuming that you need to manually add keys to /boot/config/ssh/root.pubkeys to have them survive the array stopping and starting.

Edited by ThatDude
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