mirror of
http://galexander.org/git/simplesshd.git
synced 2024-11-15 19:48:56 +00:00
137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/*
|
|
* 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 _ALGO_H_
|
|
|
|
#define _ALGO_H_
|
|
|
|
#include "includes.h"
|
|
#include "buffer.h"
|
|
|
|
#define DROPBEAR_MODE_UNUSED 0
|
|
#define DROPBEAR_MODE_CBC 1
|
|
#define DROPBEAR_MODE_CTR 2
|
|
|
|
struct Algo_Type {
|
|
|
|
const unsigned char *name; /* identifying name */
|
|
char val; /* a value for this cipher, or -1 for invalid */
|
|
const void *data; /* algorithm specific data */
|
|
char usable; /* whether we can use this algorithm */
|
|
const void *mode; /* the mode, currently only used for ciphers,
|
|
points to a 'struct dropbear_cipher_mode' */
|
|
};
|
|
|
|
typedef struct Algo_Type algo_type;
|
|
|
|
/* lists mapping ssh types of algorithms to internal values */
|
|
extern algo_type sshkex[];
|
|
extern algo_type sshhostkey[];
|
|
extern algo_type sshciphers[];
|
|
extern algo_type sshhashes[];
|
|
extern algo_type ssh_compress[];
|
|
extern algo_type ssh_nocompress[];
|
|
|
|
extern const struct dropbear_cipher dropbear_nocipher;
|
|
extern const struct dropbear_cipher_mode dropbear_mode_none;
|
|
extern const struct dropbear_hash dropbear_nohash;
|
|
|
|
struct dropbear_cipher {
|
|
const struct ltc_cipher_descriptor *cipherdesc;
|
|
const unsigned long keysize;
|
|
const unsigned char blocksize;
|
|
};
|
|
|
|
struct dropbear_cipher_mode {
|
|
int (*start)(int cipher, const unsigned char *IV,
|
|
const unsigned char *key,
|
|
int keylen, int num_rounds, void *cipher_state);
|
|
int (*encrypt)(const unsigned char *pt, unsigned char *ct,
|
|
unsigned long len, void *cipher_state);
|
|
int (*decrypt)(const unsigned char *ct, unsigned char *pt,
|
|
unsigned long len, void *cipher_state);
|
|
};
|
|
|
|
struct dropbear_hash {
|
|
const struct ltc_hash_descriptor *hash_desc;
|
|
const unsigned long keysize;
|
|
/* hashsize may be truncated from the size returned by hash_desc,
|
|
eg sha1-96 */
|
|
const unsigned char hashsize;
|
|
};
|
|
|
|
enum dropbear_kex_mode {
|
|
DROPBEAR_KEX_NORMAL_DH,
|
|
DROPBEAR_KEX_ECDH,
|
|
DROPBEAR_KEX_CURVE25519,
|
|
};
|
|
|
|
struct dropbear_kex {
|
|
enum dropbear_kex_mode mode;
|
|
|
|
/* "normal" DH KEX */
|
|
const unsigned char *dh_p_bytes;
|
|
const int dh_p_len;
|
|
|
|
/* elliptic curve DH KEX */
|
|
#ifdef DROPBEAR_ECDH
|
|
const struct dropbear_ecc_curve *ecc_curve;
|
|
#else
|
|
const void* dummy;
|
|
#endif
|
|
|
|
/* both */
|
|
const struct ltc_hash_descriptor *hash_desc;
|
|
};
|
|
|
|
int have_algo(char* algo, size_t algolen, algo_type algos[]);
|
|
void buf_put_algolist(buffer * buf, algo_type localalgos[]);
|
|
|
|
enum kexguess2_used {
|
|
KEXGUESS2_LOOK,
|
|
KEXGUESS2_NO,
|
|
KEXGUESS2_YES,
|
|
};
|
|
|
|
#define KEXGUESS2_ALGO_NAME "kexguess2@matt.ucc.asn.au"
|
|
#define KEXGUESS2_ALGO_ID 99
|
|
|
|
|
|
algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
|
|
enum kexguess2_used *kexguess2, int *goodguess);
|
|
|
|
#ifdef ENABLE_USER_ALGO_LIST
|
|
int check_user_algos(const char* user_algo_list, algo_type * algos,
|
|
const char *algo_desc);
|
|
char * algolist_string(algo_type algos[]);
|
|
#endif
|
|
|
|
enum {
|
|
DROPBEAR_COMP_NONE,
|
|
DROPBEAR_COMP_ZLIB,
|
|
DROPBEAR_COMP_ZLIB_DELAY,
|
|
};
|
|
|
|
#endif /* _ALGO_H_ */
|