aboutsummaryrefslogtreecommitdiff
path: root/include/libssh/session.h
blob: 33ef87957e5ecdd383ff31e743097037d5c61ae0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * This file is part of the SSH Library
 *
 * Copyright (c) 2009 by Aris Adamantiadis
 *
 * The SSH Library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * The SSH Library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the SSH Library; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#ifndef SESSION_H_
#define SESSION_H_
#include "libssh/priv.h"
#include "libssh/packet.h"
#include "libssh/pcap.h"
#include "libssh/auth.h"
#include "libssh/channels.h"
#include "libssh/poll.h"
typedef struct ssh_kbdint_struct* ssh_kbdint;

/* These are the different states a SSH session can be into its life */
enum ssh_session_state_e {
	SSH_SESSION_STATE_NONE=0,
	SSH_SESSION_STATE_CONNECTING,
	SSH_SESSION_STATE_SOCKET_CONNECTED,
	SSH_SESSION_STATE_BANNER_RECEIVED,
	SSH_SESSION_STATE_INITIAL_KEX,
	SSH_SESSION_STATE_KEXINIT_RECEIVED,
	SSH_SESSION_STATE_DH,
	SSH_SESSION_STATE_AUTHENTICATING,
	SSH_SESSION_STATE_AUTHENTICATED,
	SSH_SESSION_STATE_ERROR,
	SSH_SESSION_STATE_DISCONNECTED
};

enum ssh_dh_state_e {
  DH_STATE_INIT=0,
  DH_STATE_INIT_SENT,
  DH_STATE_NEWKEYS_SENT,
  DH_STATE_FINISHED
};

struct ssh_session_struct {
    struct error_struct error;
    struct ssh_socket_struct *socket;
    char *serverbanner;
    char *clientbanner;
    int protoversion;
    int server;
    int client;
    int openssh;
    uint32_t send_seq;
    uint32_t recv_seq;
/* status flags */
    int closed;
    int closed_by_except;

    int connected;
    /* !=0 when the user got a session handle */
    int alive;
    /* two previous are deprecated */
    /* int auth_service_asked; */

/* socket status */
    int blocking; /* functions should block */

    ssh_string banner; /* that's the issue banner from
                       the server */
    char *discon_msg; /* disconnect message from
                         the remote host */
    ssh_buffer in_buffer;
    PACKET in_packet;
    ssh_buffer out_buffer;

    /* the states are used by the nonblocking stuff to remember */
    /* where it was before being interrupted */
    enum ssh_session_state_e session_state;
    int packet_state;
    enum ssh_dh_state_e dh_handshake_state;
    enum ssh_auth_service_state_e auth_service_state;
    enum ssh_auth_state_e auth_state;
    enum ssh_channel_request_state_e global_req_state;
    ssh_string dh_server_signature; /* information used by dh_handshake. */
    KEX server_kex;
    KEX client_kex;
    ssh_buffer in_hashbuf;
    ssh_buffer out_hashbuf;
    struct ssh_crypto_struct *current_crypto;
    struct ssh_crypto_struct *next_crypto;  /* next_crypto is going to be used after a SSH2_MSG_NEWKEYS */

    ssh_channel channels; /* linked list of channels */
    int maxchannel;
    int exec_channel_opened; /* version 1 only. more
                                info in channels1.c */
    ssh_agent agent; /* ssh agent */

/* keyb interactive data */
    struct ssh_kbdint_struct *kbdint;
    int version; /* 1 or 2 */
    /* server host keys */
    ssh_private_key rsa_key;
    ssh_private_key dsa_key;
    /* auths accepted by server */
    int auth_methods;
    int hostkeys; /* contains type of host key wanted by client, in server impl */
    struct ssh_list *ssh_message_list; /* list of delayed SSH messages */
    int (*ssh_message_callback)( struct ssh_session_struct *session, ssh_message msg, void *userdata);
    void *ssh_message_callback_data;
    int log_verbosity; /*cached copy of the option structure */
    int log_indent; /* indentation level in enter_function logs */

    void (*ssh_connection_callback)( struct ssh_session_struct *session);
    ssh_callbacks callbacks; /* Callbacks to user functions */
    struct ssh_packet_callbacks_struct default_packet_callbacks;
    struct ssh_list *packet_callbacks;
    struct ssh_socket_callbacks_struct socket_callbacks;
    ssh_poll_ctx default_poll_ctx;
    /* options */
#ifdef WITH_PCAP
    ssh_pcap_context pcap_ctx; /* pcap debugging context */
#endif
    char *username;
    char *host;
    char *bindaddr; /* bind the client to an ip addr */
    char *xbanner; /* TODO: looks like it is not needed */
    struct ssh_list *identity;
    char *sshdir;
    char *knownhosts;
    char *wanted_methods[10];
    unsigned long timeout; /* seconds */
    unsigned long timeout_usec;
    unsigned int port;
    socket_t fd;
    int ssh2;
    int ssh1;
    int StrictHostKeyChecking;
    char *ProxyCommand;
};

int ssh_handle_packets(ssh_session session, int timeout);

void ssh_socket_exception_callback(int code, int errno_code, void *user);

#endif /* SESSION_H_ */