Connecting to older OpenSSH version causes errors

[bram-pkg]

When connecting to a target with OpenSSH version 7.4, I get the following errors on the server:

Jun 14 11:03:33 [localhost] sshd[1613]: Connection from <redacted> port <port> on <redacted> port 2222
Jun 14 11:03:33 [localhost] sshd[1613]: Postponed publickey for <redacted> from <redacted> port <port> ssh2 [preauth]
Jun 14 11:03:33 [localhost] sshd[1613]: Accepted publickey for <redacted> from <redacted> port <port> ssh2: ED25519 SHA256:<fingerprint>
Jun 14 11:03:33 [localhost] sshd[1613]: pam_unix(sshd:session): session opened for user <redacted> by (uid=0)
Jun 14 11:03:33 [localhost] sshd[1613]: User child is on pid 1615
Jun 14 11:03:33 [localhost] sshd[1615]: parse_tty_modes: n_bytes_ptr != n_bytes: 141 141
Jun 14 11:03:33 [localhost] sshd[1615]: Packet integrity error (120 bytes remaining) at session.c:2035
Jun 14 11:03:33 [localhost] sshd[1615]: Disconnecting: Packet integrity error.
Jun 14 11:03:33 [localhost] sshd[1613]: pam_unix(sshd:session): session closed for user <redacted>

This results in an immediate disconnect after authenticating successfully, Warpgate even says in green text "Warpgate connected".

[Eugeny]

Could you please run Warpgate as RUST_LOG=debug warpgate run, try connecting again and post the resulting log?

[bram-pkg]

Sure thing, give me a minute.

[bram-pkg]

Sent the logs via email.

[Eugeny]

Should be fixed in the nightly: https://github.com/warp-tech/warpgate/actions/runs/2521517351

[bram-pkg]

I've tested this on the latest snapshot, this issues does not appear to have been fixed.

I've emailed you the logs.

[bram-pkg]

Here are the logs from the target:

Jun 19 20:35:39 [localhost] sshd[68391]: Connection from <redacted> port 44132 on <redacted> port 22
Jun 19 20:35:39 [localhost] sshd[68391]: Postponed publickey for <redacted> from <redacted> port 44132 ssh2 [preauth]
Jun 19 20:35:39 [localhost] sshd[68391]: Accepted publickey for <redacted> from <redacted> port 44132 ssh2: ED25519 <redacted>
Jun 19 20:35:39 [localhost] sshd[68391]: pam_unix(sshd:session): session opened for user <redacted> by (uid=0)
Jun 19 20:35:39 [localhost] sshd[68391]: User child is on pid 68393
Jun 19 20:35:39 [localhost] sshd[68393]: parse_tty_modes: n_bytes_ptr != n_bytes: 141 141
Jun 19 20:35:39 [localhost] sshd[68393]: Packet integrity error (120 bytes remaining) at session.c:2035
Jun 19 20:35:39 [localhost] sshd[68393]: Disconnecting: Packet integrity error.
Jun 19 20:35:39 [localhost] sshd[68391]: pam_unix(sshd:session): session closed for user <redacted>

[Eugeny]

Thanks for the logs - fixed in https://github.com/warp-tech/warpgate/releases/tag/v0.2.7

[bram-pkg]

It's working now, thanks a ton Eugene!