On 3/22/21 1:09 PM, Aaron Jones wrote: > On 22/03/2021 09:58, Jochen Bern wrote: >> Umh, *does* every privKey that ssh "offers" (as the debug output calls >> it) qualify as an actual authentication attempt, and thus count against >> MaxAuthTries? > > Yes, in my experience it does, and with a large keyring collection in > the agent, or with a lot of keys located at default paths, a server with > a low MaxAuthTries limit will boot me out, before I can even attempt > auth, unless I specify an explicit IdentityFile= and also specify > IdentitiesOnly=yes (so that it doesn't try any others, even those > located at default paths). Below is how it looks from the client if there are seven keys in the agent and the server is set for MaxAuthTries of 6 and the seventh key is the one that is needed. For this example, there are no keys in ~/.ssh/ on the client, the extra keys were loaded from another location and the resident key was loaded into the agent directly from the hardware token. /Lars OpenSSH_8.5, LibreSSL 3.3.2 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Connecting to xx.yy.zz.1 [xx.yy.zz.1] port 22. debug1: Connection established. debug1: identity file /home/foo/.ssh/id_rsa type -1 debug1: identity file /home/foo/.ssh/id_rsa-cert type -1 debug1: identity file /home/foo/.ssh/id_dsa type -1 debug1: identity file /home/foo/.ssh/id_dsa-cert type -1 debug1: identity file /home/foo/.ssh/id_ecdsa type -1 debug1: identity file /home/foo/.ssh/id_ecdsa-cert type -1 debug1: identity file /home/foo/.ssh/id_ecdsa_sk type -1 debug1: identity file /home/foo/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /home/foo/.ssh/id_ed25519 type -1 debug1: identity file /home/foo/.ssh/id_ed25519-cert type -1 debug1: identity file /home/foo/.ssh/id_ed25519_sk type -1 debug1: identity file /home/foo/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /home/foo/.ssh/id_xmss type -1 debug1: identity file /home/foo/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_8.5 debug1: Remote protocol version 2.0, remote software version OpenSSH_8.5 debug1: compat_banner: match: OpenSSH_8.5 pat OpenSSH* compat 0x04000000 debug1: Authenticating to xx.yy.zz.1:22 as 'foo' debug1: load_hostkeys: fopen /home/foo/.ssh/known_hosts2: No such file or directory debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: algorithm: curve25519-sha256 debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: chacha20-poly1305@xxxxxxxxxxx MAC: <implicit> compression: none debug1: kex: client->server cipher: chacha20-poly1305@xxxxxxxxxxx MAC: <implicit> compression: none debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: SSH2_MSG_KEX_ECDH_REPLY received debug1: Server host key: ecdsa-sha2-nistp256 SHA256:t9pNvmtPBL1aF1KSwCWPhKDvHWjuc+JRADd+Lwo6a8I debug1: load_hostkeys: fopen /home/foo/.ssh/known_hosts2: No such file or directory debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory debug1: Host 'xx.yy.zz.1' is known and matches the ECDSA host key. debug1: Found key in /home/foo/.ssh/known_hosts:1 debug1: rekey out after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: rekey in after 134217728 blocks debug1: Will attempt key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:3bv7t8Enatq/FlViX7TMjfzn8E4mnmrB4iVLqeftSSo agent debug1: Will attempt key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:uZYDGVKzk/Casnz3epqqLS0uEEvn6vpvg+6/J6YjD/I agent debug1: Will attempt key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:viucCIEHXF2nE3k0GvB1acIasHFCoFEBvgLuCgDEJ7s agent debug1: Will attempt key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:vIb1cYSHBXMp5BEe2Kr8go+k/DQf9JcXCCwLpV70E5c agent debug1: Will attempt key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:ZTmrbytuzGBE/GK8YBkj41AkS9JacZxoyuFZWwpF5Zg agent debug1: Will attempt key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:ORYKRU3jyGhkk6zfu84Pew0cBLb+K4DLHNZvjeflxOk agent debug1: Will attempt key: ED25519-SK SHA256:pTouVKi3dKmAINwkY04Be3YKnIpUF/FoIIM0VxPTBJg authenticator agent debug1: Will attempt key: /home/foo/.ssh/id_rsa debug1: Will attempt key: /home/foo/.ssh/id_dsa debug1: Will attempt key: /home/foo/.ssh/id_ecdsa debug1: Will attempt key: /home/foo/.ssh/id_ecdsa_sk debug1: Will attempt key: /home/foo/.ssh/id_ed25519 debug1: Will attempt key: /home/foo/.ssh/id_ed25519_sk debug1: Will attempt key: /home/foo/.ssh/id_xmss debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,sk-ssh-ed25519@xxxxxxxxxxx,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@xxxxxxxxxxx,webauthn-sk-ecdsa-sha2-nistp256@xxxxxxxxxxx> debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Next authentication method: publickey debug1: Offering public key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:3bv7t8Enatq/FlViX7TMjfzn8E4mnmrB4iVLqeftSSo agent debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Offering public key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:uZYDGVKzk/Casnz3epqqLS0uEEvn6vpvg+6/J6YjD/I agent debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Offering public key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:viucCIEHXF2nE3k0GvB1acIasHFCoFEBvgLuCgDEJ7s agent debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Offering public key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:vIb1cYSHBXMp5BEe2Kr8go+k/DQf9JcXCCwLpV70E5c agent debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Offering public key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:ZTmrbytuzGBE/GK8YBkj41AkS9JacZxoyuFZWwpF5Zg agent debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Offering public key: foo@xxxxxxxxxxxxxxxxxxxxx ECDSA SHA256:ORYKRU3jyGhkk6zfu84Pew0cBLb+K4DLHNZvjeflxOk agent Received disconnect from xx.yy.zz.1 port 22:2: Too many authentication failures Disconnected from xx.yy.zz.1 port 22 _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
