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When SSH_AUTH_KEY failed will not try to auth with SSH_AUTH_PASS when use libssh #11196

zuoxiaofeng opened this issue May 24, 2023 · 0 comments


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My ssh server supported following: publickey,password,keyboard-interactive

When I try to request sftp dir list or download file from server got "Authentication failure", the debug log show that curl only have try publickey and keyboard-interactive to do auth but haven't try "password".

When I disable keyboard-interactive auth method in my server curl will try password to auth.

The keyboard-interactive auth method in my server seems cannot work well with some config issue, but the ssh command will also try to auth with password method even when keyboard-interactive failed.

  • !!! WARNING !!!
  • This is a debug build of libcurl, do not use in production.
  • STATE: INIT => CONNECT handle 0xca6d98; line 1951 (connection #-5000)
  • Added connection 0. The cache now contains 1 members
  • STATE: CONNECT => CONNECTING handle 0xca6d98; line 2004 (connection #0)
  • Trying
  • Connected to ( port 33 (#0)
  • STATE: CONNECTING => PROTOCONNECT handle 0xca6d98; line 2112 (connection #0)
  • User: lxce_sftp
  • SSH 0xca5e58 state change from SSH_STOP to SSH_INIT (line 2268)
  • SSH 0xca5e58 state change from SSH_INIT to SSH_S_STARTUP (line 708)
  • STATE: PROTOCONNECT => PROTOCONNECTING handle 0xca6d98; line 2139 (connection #0)
  • SSH 0xca5e58 state change from SSH_S_STARTUP to SSH_HOSTKEY (line 722)
  • SSH 0xca5e58 state change from SSH_HOSTKEY to SSH_AUTHLIST (line 733)
  • SSH 0xca5e58 state change from SSH_AUTHLIST to SSH_AUTH_PKEY_INIT (line 757)
  • Authentication using SSH public key file
  • SSH 0xca5e58 state change from SSH_AUTH_PKEY_INIT to SSH_AUTH_KEY_INIT (line 829)
  • SSH 0xca5e58 state change from SSH_AUTH_KEY_INIT to SSH_AUTH_KEY (line 876)
  • SSH 0xca5e58 state change from SSH_AUTH_KEY to SSH_AUTH_DONE (line 894)
  • Authentication failure
  • SSH 0xca5e58 state change from SSH_AUTH_DONE to SSH_SESSION_DISCONNECT (line 926)
  • SSH 0xca5e58 state change from SSH_SESSION_DISCONNECT to SSH_SESSION_FREE (line 1967)
  • SSH 0xca5e58 state change from SSH_SESSION_FREE to SSH_STOP (line 2015)
  • multi_done: status: 67 prem: 1 done: 0
  • multi_done, not re-using connection=0, forbid=0, close=1, premature=1, conn_multiplex=0
  • The cache now contains 0 members
  • Curl_disconnect(conn #0, dead=1)
  • SSH DISCONNECT starts now
  • SSH DISCONNECT is done
  • Closing connection 0
  • Expire cleared (transfer 0xca6d98)
    curl: (67) Authentication failure

$ curl -V
curl 7.76.1 (x86_64-redhat-linux-gnu) libcurl/7.76.1 OpenSSL/3.0.7 zlib/1.2.11 brotli/1.0.9 libidn2/2.3.0 libpsl/0.21.1 (+libidn2/2.3.0) libssh/0.10.4/openssl/zlib nghttp2/1.43.0
Release-Date: 2021-04-14
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM NTLM_WB PSL SPNEGO SSL TLS-SRP UnixSockets

I did this

I expected the following

curl/libcurl version

[curl -V output]

operating system

@bagder bagder self-assigned this May 24, 2023
bagder added a commit that referenced this issue May 24, 2023
The state machine had a mistake in that it would not carry on to that
next step.

This also adds a verbose output what methods that are available from the
server and renames the macros that change to the next auth methods to

Reported-by: 左潇峰
Fixes #11196
@bagder bagder closed this as completed in be17dc9 May 25, 2023
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