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/*
* Dropbear - a SSH2 server
*
* Copyright (c) 2002,2003 Matt Johnston
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE. */
#ifndef _SESSION_H_
#define _SESSION_H_
#include "includes.h"
#include "buffer.h"
#include "signkey.h"
#include "kex.h"
#include "auth.h"
#include "channel.h"
#include "queue.h"
#include "runopts.h"
#include "listener.h"
extern int sessinitdone; /* Is set to 0 somewhere */
extern int exitflag;
void common_session_init(int sock, runopts *opts);
void common_session_cleanup();
void checktimeouts();
void session_identification();
extern void(*session_remoteclosed)();
/* Server */
void svr_session(int sock, runopts *opts, int childpipe,
struct sockaddr *remoteaddr);
void svr_dropbear_exit(int exitcode, const char* format, va_list param);
void svr_dropbear_log(int priority, const char* format, va_list param);
struct key_context {
const struct dropbear_cipher *recv_algo_crypt; /* NULL for none */
const struct dropbear_cipher *trans_algo_crypt; /* NULL for none */
const struct dropbear_hash *recv_algo_mac; /* NULL for none */
const struct dropbear_hash *trans_algo_mac; /* NULL for none */
char algo_kex;
char algo_hostkey;
char recv_algo_comp; /* compression */
char trans_algo_comp;
#ifndef DISABLE_ZLIB
z_streamp recv_zstream;
z_streamp trans_zstream;
#endif
/* actual keys */
symmetric_CBC recv_symmetric_struct;
symmetric_CBC trans_symmetric_struct;
unsigned char recvmackey[MAX_MAC_KEY];
unsigned char transmackey[MAX_MAC_KEY];
};
struct sshsession {
/* Is it a client or server? */
unsigned char isserver;
runopts * opts; /* runtime options, incl hostkey, banner etc */
long connecttimeout; /* time to disconnect if we have a timeout (for
userauth etc), or 0 for no timeout */
int sock;
struct sockaddr *remoteaddr;
unsigned char *remotehost; /* the peer hostname */
unsigned char *remoteident;
int maxfd; /* the maximum file descriptor to check with select() */
/* Packet buffers/values etc */
buffer *writepayload; /* Unencrypted payload to write - this is used
throughout the code, as handlers fill out this
buffer with the packet to send. */
struct Queue writequeue; /* A queue of encrypted packets to send */
buffer *readbuf; /* Encrypted */
buffer *decryptreadbuf; /* Post-decryption */
buffer *payload; /* Post-decompression, the actual SSH packet */
unsigned int transseq, recvseq; /* Sequence IDs */
/* Packet-handling flags */
unsigned dataallowed : 1; /* whether we can send data packets or we are in
the middle of a KEX or something */
unsigned char expecting; /* byte indicating what packet we expect next,
or 0x00 for any */
unsigned char ignorenext; /* whether to ignore the next packet,
used for kex_follows stuff */
/* KEX/encryption related */
struct KEXState kexstate;
struct key_context *keys;
struct key_context *newkeys;
unsigned char *session_id; /* this is the hash from the first kex */
/* The below are used temorarily during kex, are freed after use */
mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
unsigned char hash[SHA1_HASH_SIZE]; /* the hash*/
buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
buffer* transkexinit; /* the kexinit packet we send should be kept so we
can add it to the hash when generating keys */
/* Channel related */
struct Channel ** channels; /* these pointers may be null */
unsigned int chansize; /* the number of Channel*s allocated for channels */
const struct ChanType **chantypes; /* The valid channel types */
/* TCP forwarding - where manage listeners */
#ifndef DISABLE_REMOTETCPFWD
struct Listener ** listeners;
unsigned int listensize;
#endif
};
struct serversession {
/* Server specific options */
int childpipe; /* kept open until we successfully authenticate */
/* userauth */
struct AuthState authstate;
struct ChildPid * childpids; /* array of mappings childpid<->channel */
unsigned int childpidsize;
};
struct clientsession {
int something; /* XXX */
};
/* Global structs storing the state */
extern struct sshsession ses;
#ifdef DROPBEAR_SERVER
extern struct serversession svr_ses;
#endif /* DROPBEAR_SERVER */
#ifdef DROPBEAR_CLIENT
extern struct serversession cli_ses;
#endif /* DROPBEAR_CLIENT */
#endif /* _SESSION_H_ */
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