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SSH key based-auth not working

Hello there, I've tried several times to set keyh based auth.

I created a key pair using 

$ ssh-keygen -t rsa -b 2048

I also added the public key to the authorized_keys:

ssh-copy-id -i pyanywhere_rsa.pub martinezfg11@ssh.pythonanywhere.com

However I'm still being prompted for password when attempting to use the key-based auth. 

$ ssh -vvv martinezfg11@ssh.pythonanywhere.com -i pyanywhere_rsa
    OpenSSH_8.9p1 Ubuntu-3, OpenSSL 3.0.2 15 Mar 2022
    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 *
    debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/martinezfg11/.ssh/known_hosts'
    debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/martinezfg11/.ssh/known_hosts2'
    debug2: resolving "ssh.pythonanywhere.com" port 22
    debug3: resolve_host: lookup ssh.pythonanywhere.com:22
    debug3: ssh_connect_direct: entering
    debug1: Connecting to ssh.pythonanywhere.com [23.21.200.247] port 22.
    debug3: set_sock_tos: set socket 3 IP_TOS 0x10
    debug1: Connection established.
    debug1: identity file pyanywhere_rsa type 0
    debug1: identity file pyanywhere_rsa-cert type -1
    debug1: Local version string SSH-2.0-OpenSSH_8.9p1 Ubuntu-3
    debug1: Remote protocol version 2.0, remote software version OpenSSH_8.2p1 Ubuntu-4ubuntu0.5
    debug1: compat_banner: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.5 pat OpenSSH* compat 0x04000000
    debug2: fd 3 setting O_NONBLOCK
    debug1: Authenticating to ssh.pythonanywhere.com:22 as 'martinezfg11'
    debug3: record_hostkey: found key type RSA in file /home/martinezfg11/.ssh/known_hosts:1
    debug3: load_hostkeys_file: loaded 1 keys from ssh.pythonanywhere.com
    debug1: load_hostkeys: fopen /home/martinezfg11/.ssh/known_hosts2: No such file or directory
    debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
    debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
    debug3: order_hostkeyalgs: prefer hostkeyalgs: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256
    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,sntrup761x25519-sha512@openssh.com,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
    debug2: host key algorithms: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com
    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
    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: rsa-sha2-512
    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: SSH2_MSG_KEX_ECDH_REPLY received
    debug1: Server host key: ssh-rsa SHA256:zy2jmqxNg/fs6tFZK55OjHTI3B2UofzOiUvTPtcX3/Y
    debug3: record_hostkey: found key type RSA in file /home/martinezfg11/.ssh/known_hosts:1
    debug3: load_hostkeys_file: loaded 1 keys from ssh.pythonanywhere.com
    debug1: load_hostkeys: fopen /home/martinezfg11/.ssh/known_hosts2: No such file or directory
    debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
    debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
    debug1: Host 'ssh.pythonanywhere.com' is known and matches the RSA host key.
    debug1: Found key in /home/martinezfg11/.ssh/known_hosts:1
    debug3: send packet: type 21
    debug2: ssh_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: ssh_set_newkeys: mode 0
    debug1: rekey in after 134217728 blocks
    debug1: Will attempt key: pyanywhere_rsa RSA SHA256:G4a8NmFidztgq0j3Oyt/zvtqDnJhcw8u8gOV+B+L874 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>
    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 53
    debug3: input_userauth_banner: entering
    <<<<<<:>~ PythonAnywhere SSH. Help @ https://help.pythonanywhere.com/pages/SSHAccess
    debug3: receive packet: type 51
    debug1: Authentications that can continue: publickey,password
    debug3: start over, passed a different list publickey,password
    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: pyanywhere_rsa RSA SHA256:G4a8NmFidztgq0j3Oyt/zvtqDnJhcw8u8gOV+B+L874 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,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
    martinezfg11@ssh.pythonanywhere.com's password:

Any idea on what I could be doing wrong? I've generated new keypairs several times now.

martinezfg11 | 1 post | Jan. 4, 2023, 4:13 a.m. | permalink

Try using an ssh-rsa key instead.

Staff glenn | 9498 posts | PythonAnywhere staff | Jan. 4, 2023, 1:46 p.m. | permalink