138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/* $OpenBSD: ssh_api.h,v 1.2 2018/04/10 00:10:49 djm Exp $ */
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/*
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* Copyright (c) 2012 Markus Friedl. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef API_H
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#define API_H
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#include <sys/types.h>
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#include <signal.h>
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#include "openbsd-compat/sys-queue.h"
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#include "cipher.h"
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#include "sshkey.h"
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#include "kex.h"
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#include "ssh.h"
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#include "ssh2.h"
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#include "packet.h"
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struct kex_params {
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char *proposal[PROPOSAL_MAX];
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};
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/* public SSH API functions */
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/*
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* ssh_init() create a ssh connection object with given (optional)
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* key exchange parameters.
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*/
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int ssh_init(struct ssh **, int is_server, struct kex_params *kex_params);
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/*
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* release ssh connection state.
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*/
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void ssh_free(struct ssh *);
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/*
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* attach application specific data to the connection state
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*/
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void ssh_set_app_data(struct ssh *, void *);
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void *ssh_get_app_data(struct ssh *);
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/*
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* ssh_add_hostkey() registers a private/public hostkey for an ssh
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* connection.
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* ssh_add_hostkey() needs to be called before a key exchange is
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* initiated with ssh_packet_next().
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* private hostkeys are required if we need to act as a server.
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* public hostkeys are used to verify the servers hostkey.
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*/
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int ssh_add_hostkey(struct ssh *ssh, struct sshkey *key);
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/*
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* ssh_set_verify_host_key_callback() registers a callback function
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* which should be called instead of the default verification. The
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* function given must return 0 if the hostkey is ok, -1 if the
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* verification has failed.
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*/
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int ssh_set_verify_host_key_callback(struct ssh *ssh,
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int (*cb)(struct sshkey *, struct ssh *));
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/*
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* ssh_packet_next() advances to the next input packet and returns
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* the packet type in typep.
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* ssh_packet_next() works by processing an input byte-stream,
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* decrypting the received data and hiding the key-exchange from
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* the caller.
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* ssh_packet_next() sets typep if there is no new packet available.
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* in this case the caller must fill the input byte-stream by passing
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* the data received over network to ssh_input_append().
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* additionally, the caller needs to send the resulting output
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* byte-stream back over the network. otherwise the key exchange
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* would not proceed. the output byte-stream is accessed through
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* ssh_output_ptr().
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*/
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int ssh_packet_next(struct ssh *ssh, u_char *typep);
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/*
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* ssh_packet_payload() returns a pointer to the raw payload data of
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* the current input packet and the length of this payload.
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* the payload is accessible until ssh_packet_next() is called again.
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*/
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const u_char *ssh_packet_payload(struct ssh *ssh, size_t *lenp);
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/*
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* ssh_packet_put() creates an encrypted packet with the given type
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* and payload.
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* the encrypted packet is appended to the output byte-stream.
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*/
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int ssh_packet_put(struct ssh *ssh, int type, const u_char *data,
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size_t len);
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/*
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* ssh_input_space() checks if 'len' bytes can be appended to the
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* input byte-stream.
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*/
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int ssh_input_space(struct ssh *ssh, size_t len);
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/*
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* ssh_input_append() appends data to the input byte-stream.
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*/
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int ssh_input_append(struct ssh *ssh, const u_char *data, size_t len);
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/*
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* ssh_output_space() checks if 'len' bytes can be appended to the
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* output byte-stream. XXX
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*/
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int ssh_output_space(struct ssh *ssh, size_t len);
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/*
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* ssh_output_ptr() retrieves both a pointer and the length of the
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* current output byte-stream. the bytes need to be sent over the
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* network. the number of bytes that have been successfully sent can
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* be removed from the output byte-stream with ssh_output_consume().
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*/
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const u_char *ssh_output_ptr(struct ssh *ssh, size_t *len);
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/*
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* ssh_output_consume() removes the given number of bytes from
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* the output byte-stream.
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*/
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int ssh_output_consume(struct ssh *ssh, size_t len);
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#endif
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