Access with SSH keys does not work properly

Installing and Using OpenWrt
1

Hi there,

I have problems activating SSH keys on OpenWRT 21.02. With
ssh-keygen -t ECDSA -f openwrt_ecdsa
I have created on the SSH client for SSH login and using
cat ~/.ssh/openwrt_ecdsa.pub | ssh -p 22 root@192.168.0.1 'umask 077; cat >>.ssh/authorized_keys'
transferred to the router.
In the LUCI portal I entered the public key of openwrt_ecdsa under System=>Administration=>SSH-Keys.

If I now run
ssh -vvv -i ~/.ssh/openwrt_ecdsa root@192.168.0.1
from the client I get no connection:

OpenSSH_8.4p1 Debian-5, OpenSSL 1.1.1k  25 Mar 2021
debug1: Reading configuration data /home/diani/.ssh/config
debug1: /home/diani/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolve_canonicalize: hostname 192.168.0.1 is address
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/diani/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/diani/.ssh/known_hosts2'
debug2: ssh_connect_direct
debug1: Connecting to 192.168.0.1 [192.168.0.1] port 22.
debug1: Connection established.
debug1: identity file /home/diani/.ssh/openwrt_ecdsa type 2
debug1: identity file /home/diani/.ssh/openwrt_ecdsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.4p1 Debian-5
debug1: Remote protocol version 2.0, remote software version dropbear
debug1: no match: dropbear
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 192.168.0.1:22 as 'root'
debug3: hostkeys_foreach: reading file "/home/diani/.ssh/known_hosts"
debug3: record_hostkey: found key type ED25519 in file /home/diani/.ssh/known_hosts:223
debug3: load_hostkeys: loaded 1 keys from 192.168.0.1
debug3: order_hostkeyalgs: prefer hostkeyalgs: ssh-ed25519-cert-v01@openssh.com,ssh-ed25519
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-group14-sha256,ext-info-c
debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@openssh.com,sk-ssh-ed25519@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
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@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@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@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,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,kexguess2@matt.ucc.asn.au
debug2: host key algorithms: ssh-ed25519,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes256-ctr
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes256-ctr
debug2: MACs ctos: hmac-sha1,hmac-sha2-256
debug2: MACs stoc: hmac-sha1,hmac-sha2-256
debug2: compression ctos: none
debug2: compression stoc: none
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com 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: ssh-ed25519 SHA256:9pP5YZHLc0+dV1i7Z9WYirEfGFKbAT4xkRhj0LdgZGk
debug3: hostkeys_foreach: reading file "/home/diani/.ssh/known_hosts"
debug3: record_hostkey: found key type ED25519 in file /home/diani/.ssh/known_hosts:223
debug3: load_hostkeys: loaded 1 keys from 192.168.0.1
debug1: Host '192.168.0.1' is known and matches the ED25519 host key.
debug1: Found key in /home/diani/.ssh/known_hosts:223
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out 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 in after 134217728 blocks
debug1: Will attempt key: /home/diani/.ssh/openwrt_ecdsa ECDSA SHA256:+3/Zz2oVUxfqW9DCYw0eEvWTYWFrTw/i39kJ7/tMZJE explicit
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,rsa-sha2-256,ssh-rsa>
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
debug3: start over, passed a different list publickey
debug3: preferred 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/diani/.ssh/openwrt_ecdsa ECDSA SHA256:+3/Zz2oVUxfqW9DCYw0eEvWTYWFrTw/i39kJ7/tMZJE explicit
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
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
root@192.168.0.1: Permission denied (publickey).

Curiously, I had already installed an SSH key for a client on a VPN tunnel (vpn0). And this SSH login towards router works fine.

Another point is to limit SSH access to individual interfaces. This is currently set to "unspecified". I do not like it. But a restriction to the interfaces "vpn0", "home", "office" fails. Access via ssh is then no longer possible.
What am I doing wrong right now?

Best regards
Diani

2

Does this help?

3

Unfortunately, that doesn't help now either. I have now also added an SSH key to the router for the root on the client as shown above.

4

I tried it myself and was able to login successfully.
For root user, if you are using dropbear, you need to copy the key in /etc/dropbear/authorized_keys
What is the output of:
ls -la /etc/dropbear/authorized_keys; uci export dropbear

5 
-rw-------    1 root     root          1094 Feb  9 12:17 /etc/dropbear/authorized_keys
package dropbear

config dropbear
        option Port '22'
        option PasswordAuth 'on'

config dropbear
        option Interface 'vpn0'
        option RootPasswordAuth 'off'
        option PasswordAuth 'off'
6

And this

ls -la /etc/dropbear/authorized_keys; uci export dropbear
-rw-------    1 root     root          1094 Feb  9 12:17 /etc/dropbear/authorized_keys
package dropbear

config dropbear
        option Port '22'
        option PasswordAuth 'off'
        option RootPasswordAuth 'off'

config dropbear
        option Interface 'vpn0'
        option RootPasswordAuth 'off'
        option PasswordAuth 'off'

delivers:

 ssh root@192.168.0.1
root@192.168.0.1: Permission denied (publickey).
7 
SSH_MSG_USERAUTH_FAILURE                51     [SSH-USERAUTH]

Verify that you have inserted the public key properly in the authorized_keys file. Not sure if important, but in my case it has read rights for group and others. chmod 644 /etc/dropbear/authorized_keys

8

Changing the rights doesn't help. And in /etc/dropbear/authorized_keys are the keys that were inserted via Luci.
So far, only password-free access as root via the VPN tunnel has worked. The password is required for the other clients.

9

ECC on by default in 21.x stable?

10

Select the interface for the first instance. Or run one for all interfaces. If the instances are overlapping interfaces, use a different port.

11

What do you mean with ECC?

12

I added the VPN0 interface separately because I actually want to restrict SSH access to VPN0, Home, Office. All interfaces is too risky with. But the working SSH access has so far only worked via the tunnel with the "unspecified" interface.

Currently the working setting looks like this.

package dropbear
config dropbear
        option Port '22'
        option PasswordAuth 'on

But that causes problems for all other clients.
I explicitly need access with an SSH key for a FreePBX server behind OpenWRT so that it can use Fail2Ban to set iptables rules against unauthorized attackers.

13

I could solve the problem now. As shown, the keys created so
ssh-keygen -t ECDSA -f openwrt_ecdsa
So the key given a function name. That does not seem to like that OpenWrt, because if I only
ssh-keygen -t RSA
for the key generation, the whole works. I noticed in the highly vibration edition of SSH. Because here he looks for ~ /.ssh/id_dsa and nothing else.

14

I was not able to reproduce that. ecdsa key worked fine for me.

Summary 
root@RockPi:/home/dietpi# ssh -vvv -i .ssh/openwrt_ecdsa root@magiatiko
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 "magiatiko" port 22
debug2: ssh_connect_direct
debug1: Connecting to magiatiko [10.0.2.1] port 22.
debug1: Connection established.
debug1: identity file .ssh/openwrt_ecdsa type 2
debug1: identity file .ssh/openwrt_ecdsa-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_8.4
debug1: match: OpenSSH_8.4 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to magiatiko:22 as 'root'
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type ED25519 in file /root/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from magiatiko
debug3: order_hostkeyalgs: prefer hostkeyalgs: ssh-ed25519-cert-v01@openssh.com,ssh-ed25519
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-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
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@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@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@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-group14-sha256
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
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@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@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@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: ssh-ed25519
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com 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: ssh-ed25519 SHA256:sXJFwl2BHSIvT3A2FGwwmfuSbJmAkaLNq5WncYQVv7k
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type ED25519 in file /root/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from magiatiko
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug1: Host 'magiatiko' is known and matches the ED25519 host key.
debug1: Found key in /root/.ssh/known_hosts:2
Warning: Permanently added the ED25519 host key for IP address '10.0.2.1' to the list of known hosts.
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: .ssh/openwrt_ecdsa ECDSA SHA256:+tXfZqZkfWpVkTnaw9XjvTjlaWY404fnvJYVr2ZkWGw explicit
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,keyboard-interactive
debug3: start over, passed a different list publickey,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: .ssh/openwrt_ecdsa ECDSA SHA256:+tXfZqZkfWpVkTnaw9XjvTjlaWY404fnvJYVr2ZkWGw explicit
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: .ssh/openwrt_ecdsa ECDSA SHA256:+tXfZqZkfWpVkTnaw9XjvTjlaWY404fnvJYVr2ZkWGw explicit
debug3: sign_and_send_pubkey: ECDSA SHA256:+tXfZqZkfWpVkTnaw9XjvTjlaWY404fnvJYVr2ZkWGw
debug3: sign_and_send_pubkey: signing using ecdsa-sha2-nistp256
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to magiatiko ([10.0.2.1]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions@openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug3: receive packet: type 4
debug1: Remote: /root/.ssh/authorized_keys:14: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 4
debug1: Remote: /root/.ssh/authorized_keys:14: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug1: Sending environment.
debug3: Ignored env SHELL
debug3: Ignored env SUDO_GID
debug3: Ignored env LANGUAGE
debug1: Sending env LC_ADDRESS = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_NAME = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env SUDO_COMMAND
debug1: Sending env LC_MONETARY = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env SUDO_USER
debug3: Ignored env PWD
debug3: Ignored env LOGNAME
debug3: Ignored env HOME
debug1: Sending env LANG = en_GB.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_PAPER = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env LS_COLORS
debug3: Ignored env TERM
debug1: Sending env LC_IDENTIFICATION = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env USER
debug3: Ignored env SHLVL
debug1: Sending env LC_TELEPHONE = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_MEASUREMENT = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_TIME = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_ALL = el_GR.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug1: Sending env LC_COLLATE = C
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env PATH
debug3: Ignored env SUDO_UID
debug3: Ignored env MAIL
debug1: Sending env LC_NUMERIC = el_GR.utf8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env _
debug3: Ignored env OLDPWD
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0


BusyBox v1.33.1 (2021-10-24 09:01:35 UTC) built-in shell (ash)

  _______                     ________        __
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          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt 21.02.1, r16325-88151b8303
 -----------------------------------------------------
root@magiatiko:[~]#

The problem lies on your server which doesn't support it:

While in my case: 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>

15

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