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62 lines
2.4 KiB
Groff
62 lines
2.4 KiB
Groff
.\" Copyright (C) The libssh2 project and its contributors.
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.\" SPDX-License-Identifier: BSD-3-Clause
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.TH libssh2_userauth_keyboard_interactive_ex 3 "8 Mar 2008" "libssh2 0.19" "libssh2"
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.SH NAME
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libssh2_userauth_keyboard_interactive_ex - authenticate a session using
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keyboard-interactive authentication
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.SH SYNOPSIS
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.nf
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#include <libssh2.h>
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int
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libssh2_userauth_keyboard_interactive_ex(LIBSSH2_SESSION *session,
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const char *username,
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unsigned int username_len,
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LIBSSH2_USERAUTH_KBDINT_RESPONSE_FUNC(*response_callback));
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.fi
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.SH DESCRIPTION
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\fIsession\fP - Session instance as returned by
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\fIlibssh2_session_init_ex(3)\fP.
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\fIusername\fP - Name of user to attempt keyboard-interactive authentication
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for.
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\fIusername_len\fP - Length of username parameter.
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\fIresponse_callback\fP - As authentication proceeds, the host issues several
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(1 or more) challenges and requires responses. This callback will be called at
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this moment. The callback is responsible to obtain responses for the
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challenges, fill the provided data structure and then return
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control. Responses will be sent to the host. String values will be free(3)ed
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by the library. The callback prototype must match this:
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.nf
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void response(const char *name,
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int name_len, const char *instruction,
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int instruction_len,
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int num_prompts,
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const LIBSSH2_USERAUTH_KBDINT_PROMPT *prompts,
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LIBSSH2_USERAUTH_KBDINT_RESPONSE *responses,
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void **abstract);
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.fi
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Attempts keyboard-interactive (challenge/response) authentication.
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Note that many SSH servers will always issue a single "password" challenge,
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requesting actual password as response, but it is not required by the
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protocol, and various authentication schemes, such as smartcard authentication
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may use keyboard-interactive authentication type too.
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.SH RETURN VALUE
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Return 0 on success or negative on failure. It returns LIBSSH2_ERROR_EAGAIN
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when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative
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number, it is not really a failure per se.
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.SH ERRORS
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\fILIBSSH2_ERROR_ALLOC\fP - An internal memory allocation call failed.
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\fILIBSSH2_ERROR_SOCKET_SEND\fP - Unable to send data on socket.
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\fILIBSSH2_ERROR_AUTHENTICATION_FAILED\fP - failed, invalid username/password
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or public/private key.
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.SH SEE ALSO
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.BR libssh2_session_init_ex(3)
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