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Top Forums Shell Programming and Scripting Passing Password to SSH without using expect in a Script Post 302546022 by pludi on Wednesday 10th of August 2011 08:35:28 AM
Old 08-10-2011
You can't, and this isn't a bug, it's a feature to prevent anyone on the same machine from getting at your password. Using expect to circumvent this is already a very bad idea in my opinion.

If you don't want to enter a password, use public key authentication.
 

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libssh2_userauth_password_ex(3) 				  libssh2 manual				   libssh2_userauth_password_ex(3)

NAME
libssh2_userauth_password_ex - authenticate a session with username and password SYNOPSIS
#include <libssh2.h> int libssh2_userauth_password_ex(LIBSSH2_SESSION *session, const char *username, unsigned int username_len, const char *password, unsigned int password_len, LIBSSH2_PASSWD_CHANGEREQ_FUNC((*passwd_change_cb))); #define libssh2_userauth_password(session, username, password) libssh2_userauth_password_ex((session), (username), strlen(username), (password), strlen(password), NULL) DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3) username - Name of user to attempt plain password authentication for. username_len - Length of username parameter. password - Password to use for authenticating username. password_len - Length of password parameter. passwd_change_cb - If the host accepts authentication but requests that the password be changed, this callback will be issued. If no call- back is defined, but server required password change, authentication will fail. Attempt basic password authentication. Note that many SSH servers which appear to support ordinary password authentication actually have it disabled and use Keyboard Interactive authentication (routed via PAM or another authentication backed) instead. RETURN VALUE
Return 0 on success or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se. ERRORS
Some of the errors this function may return include: LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket. LIBSSH2_ERROR_PASSWORD_EXPIRED - IBSSH2_ERROR_AUTHENTICATION_FAILED - failed, invalid username/password or public/private key. SEE ALSO
libssh2_session_init_ex(3) libssh2 0.15 1 Jun 2007 libssh2_userauth_password_ex(3)
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