[QUESTION] - Unable to use RSA keys on win11

[Halifuda]

Hello! I have tried termscp and found it awesome. But when I try to connect to a server by RSA key authentification, I failed.
Some basic infos:

• I'm on Win11 and OpenSSH;
• I can connect to that server by raw ssh and sftp command, password and RSA key both;
• I can connect to the server by password in termscp;
• termscp reported could not find any suitable RSA key to authenticate with when I try to use RSA key;
• in log file it says (IPaddr omitted):

2023-04-01T12:27:50.9831439Z [INFO] Client is not connected to remote; connecting to***.***.***.***:XXXX
2023-04-01T12:27:51.2634982Z [ERROR] Authentication failed: [Session(-1)] unknown error
2023-04-01T12:27:55.2524085Z [INFO] FileTransferActivity terminated due to 'Authentication'

I have tried to solve this problem by:

• change server addr, including alias in .ssh/config, raw ip, ip with port (...:X), I have changed in both bookmark and key storage;
• change the content of key file, including add or remove the START and END (the doc says use private key so I didnot give termscp the public key);
• re-edit the toml files in termscp storage.

I found termscp useful, but that server will likely ban password in a few weeks. Could you tell the cause and solution, and (if necessary) update doc? I found the doc says little about the usage of key.

[veeso]

You should try to run termscp with -D option to have the debug log to see what is trying to use as a key. It depends on the configuration and this sometimes is causing issues. I suggest anyway to add the key directly into termscp from the configuration, which always works.

[Halifuda]

Thanks for your reply, however, I failed to workaround:
When I specify the key path in config.toml, and run with -D, I got (time and username are omiteed):

[TRACE] (1) remotefs_ssh::ssh::commons: [C:\Users\ME\.cargo\registry\src\github.com-1ecc6299db9ec823\remotefs-ssh-0.1.3\src\ssh\commons.rs:135] Configuring algorithm preferences...
[DEBUG] (1) remotefs_ssh::ssh::commons: Authenticating with username 'USER' and RSA key
[TRACE] (1) remotefs_ssh::ssh::commons: [C:\Users\ME\.cargo\registry\src\github.com-1ecc6299db9ec823\remotefs-ssh-0.1.3\src\ssh\commons.rs:208] Trying to authenticate with RSA key at 'KEYPATH'
[ERROR] Authentication failed: [Session(-1)] unknown error
[INFO] FileTransferActivity terminated due to 'Authentication'

I looked the src in remotefs, I found it can successfully locate my key. The error seems in ssh2 crate, which cannot load the key.
I have move the key file to several different places, and I even replace it with unexisting file, but the ERRORs remain the same. It seems like a bug in ssh2?

[veeso]

Yeah, it looks like an unsupported RSA key for some reason. Indeed the error is unknown

[veeso]

duplicate of #128