ttssh2/ttxssh/ssh.h

/*
 * Copyright (c) 1998-2001, Robert O'Callahan
 * (C) 2004-2017 TeraTerm Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
This code is copyright (C) 1998-1999 Robert O'Callahan.
See LICENSE.TXT for the license.
*/

#ifndef __SSH_H
#define __SSH_H

#include "zlib.h"
#include <openssl/evp.h>

#include "buffer.h"
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>

#define DEBUG_PRINT_TO_FILE(base, msg, len) { \
        static int count = 0; \
        debug_print(count + base, msg, len); \
        count++; \
}

// from OpenSSH
extern const EVP_CIPHER *evp_aes_128_ctr(void);
extern const EVP_CIPHER *evp_des3_ctr(void);
extern const EVP_CIPHER *evp_bf_ctr(void);
extern const EVP_CIPHER *evp_cast5_ctr(void);
extern const EVP_CIPHER *evp_camellia_128_ctr(void);

/* Some of this code has been adapted from Ian Goldberg's Pilot SSH */

typedef enum {
        SSH_MSG_NONE, SSH_MSG_DISCONNECT, SSH_SMSG_PUBLIC_KEY, //2
        SSH_CMSG_SESSION_KEY, SSH_CMSG_USER, SSH_CMSG_AUTH_RHOSTS, // 5
        SSH_CMSG_AUTH_RSA, SSH_SMSG_AUTH_RSA_CHALLENGE,
        SSH_CMSG_AUTH_RSA_RESPONSE, SSH_CMSG_AUTH_PASSWORD,
        SSH_CMSG_REQUEST_PTY, // 10
        SSH_CMSG_WINDOW_SIZE, SSH_CMSG_EXEC_SHELL,
        SSH_CMSG_EXEC_CMD, SSH_SMSG_SUCCESS, SSH_SMSG_FAILURE,
        SSH_CMSG_STDIN_DATA, SSH_SMSG_STDOUT_DATA, SSH_SMSG_STDERR_DATA,
        SSH_CMSG_EOF, SSH_SMSG_EXITSTATUS,
        SSH_MSG_CHANNEL_OPEN_CONFIRMATION, SSH_MSG_CHANNEL_OPEN_FAILURE,
        SSH_MSG_CHANNEL_DATA, SSH_MSG_CHANNEL_INPUT_EOF,
        SSH_MSG_CHANNEL_OUTPUT_CLOSED, SSH_MSG_OBSOLETED0,
        SSH_SMSG_X11_OPEN, SSH_CMSG_PORT_FORWARD_REQUEST, SSH_MSG_PORT_OPEN,
        SSH_CMSG_AGENT_REQUEST_FORWARDING, SSH_SMSG_AGENT_OPEN,
        SSH_MSG_IGNORE, SSH_CMSG_EXIT_CONFIRMATION,
        SSH_CMSG_X11_REQUEST_FORWARDING, SSH_CMSG_AUTH_RHOSTS_RSA,
        SSH_MSG_DEBUG, SSH_CMSG_REQUEST_COMPRESSION,
        SSH_CMSG_MAX_PACKET_SIZE, SSH_CMSG_AUTH_TIS,
        SSH_SMSG_AUTH_TIS_CHALLENGE, SSH_CMSG_AUTH_TIS_RESPONSE,
        SSH_CMSG_AUTH_KERBEROS, SSH_SMSG_AUTH_KERBEROS_RESPONSE
} SSHMessage;

typedef enum {
        // SSH1
        SSH_CIPHER_NONE, SSH_CIPHER_IDEA, SSH_CIPHER_DES, SSH_CIPHER_3DES,
        SSH_CIPHER_TSS, SSH_CIPHER_RC4, SSH_CIPHER_BLOWFISH,
        // SSH2
        SSH2_CIPHER_3DES_CBC, SSH2_CIPHER_AES128_CBC,
        SSH2_CIPHER_AES192_CBC, SSH2_CIPHER_AES256_CBC,
        SSH2_CIPHER_BLOWFISH_CBC, SSH2_CIPHER_AES128_CTR,
        SSH2_CIPHER_AES192_CTR, SSH2_CIPHER_AES256_CTR,
        SSH2_CIPHER_ARCFOUR, SSH2_CIPHER_ARCFOUR128, SSH2_CIPHER_ARCFOUR256,
        SSH2_CIPHER_CAST128_CBC,
        SSH2_CIPHER_3DES_CTR, SSH2_CIPHER_BLOWFISH_CTR, SSH2_CIPHER_CAST128_CTR,
        SSH2_CIPHER_CAMELLIA128_CBC, SSH2_CIPHER_CAMELLIA192_CBC, SSH2_CIPHER_CAMELLIA256_CBC,
        SSH2_CIPHER_CAMELLIA128_CTR, SSH2_CIPHER_CAMELLIA192_CTR, SSH2_CIPHER_CAMELLIA256_CTR,
        SSH_CIPHER_MAX = SSH2_CIPHER_CAMELLIA256_CTR,
} SSHCipher;

typedef enum {
        SSH_AUTH_NONE, SSH_AUTH_RHOSTS, SSH_AUTH_RSA, SSH_AUTH_PASSWORD,
        SSH_AUTH_RHOSTS_RSA, SSH_AUTH_TIS, SSH_AUTH_KERBEROS,
        SSH_AUTH_PAGEANT = 16,
        SSH_AUTH_MAX = SSH_AUTH_PAGEANT,
} SSHAuthMethod;

typedef enum {
        SSH_GENERIC_AUTHENTICATION, SSH_TIS_AUTHENTICATION
} SSHAuthMode;

#define SSH_PROTOFLAG_SCREEN_NUMBER 1
#define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2

enum channel_type {
        TYPE_SHELL, TYPE_PORTFWD, TYPE_SCP, TYPE_SFTP, TYPE_AGENT, TYPE_SUBSYSTEM_GEN,
};

// for SSH1
#define SSH_MAX_SEND_PACKET_SIZE   250000

// for SSH2
/* default window/packet sizes for tcp/x11-fwd-channel */
// changed CHAN_SES_WINDOW_DEFAULT from 32KB to 128KB. (2007.10.29 maya)
#define CHAN_SES_PACKET_DEFAULT (32*1024)
#define CHAN_SES_WINDOW_DEFAULT (4*CHAN_SES_PACKET_DEFAULT)
#define CHAN_TCP_PACKET_DEFAULT (32*1024)
#define CHAN_TCP_WINDOW_DEFAULT (4*CHAN_TCP_PACKET_DEFAULT)
#if 0 // unused
#define CHAN_X11_PACKET_DEFAULT (16*1024)
#define CHAN_X11_WINDOW_DEFAULT (4*CHAN_X11_PACKET_DEFAULT)
#endif


/* SSH2 constants */

/* SSH2 messages */
#define SSH2_MSG_DISCONNECT             1
#define SSH2_MSG_IGNORE                 2
#define SSH2_MSG_UNIMPLEMENTED          3
#define SSH2_MSG_DEBUG                  4
#define SSH2_MSG_SERVICE_REQUEST        5
#define SSH2_MSG_SERVICE_ACCEPT         6

#define SSH2_MSG_KEXINIT                20
#define SSH2_MSG_NEWKEYS                21

#define SSH2_MSG_KEXDH_INIT             30
#define SSH2_MSG_KEXDH_REPLY            31

#define SSH2_MSG_KEX_DH_GEX_GROUP           31
#define SSH2_MSG_KEX_DH_GEX_INIT            32
#define SSH2_MSG_KEX_DH_GEX_REPLY           33
#define SSH2_MSG_KEX_DH_GEX_REQUEST         34

#define SSH2_MSG_KEX_ECDH_INIT              30
#define SSH2_MSG_KEX_ECDH_REPLY             31

#define SSH2_MSG_USERAUTH_REQUEST            50
#define SSH2_MSG_USERAUTH_FAILURE            51
#define SSH2_MSG_USERAUTH_SUCCESS            52
#define SSH2_MSG_USERAUTH_BANNER             53

#define SSH2_MSG_USERAUTH_PK_OK              60
#define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ   60
#define SSH2_MSG_USERAUTH_INFO_REQUEST          60
#define SSH2_MSG_USERAUTH_INFO_RESPONSE         61

#define SSH2_MSG_GLOBAL_REQUEST                  80
#define SSH2_MSG_REQUEST_SUCCESS                 81
#define SSH2_MSG_REQUEST_FAILURE                 82
#define SSH2_MSG_CHANNEL_OPEN                    90
#define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION       91
#define SSH2_MSG_CHANNEL_OPEN_FAILURE            92
#define SSH2_MSG_CHANNEL_WINDOW_ADJUST           93
#define SSH2_MSG_CHANNEL_DATA                    94
#define SSH2_MSG_CHANNEL_EXTENDED_DATA           95
#define SSH2_MSG_CHANNEL_EOF                     96
#define SSH2_MSG_CHANNEL_CLOSE                   97
#define SSH2_MSG_CHANNEL_REQUEST                 98
#define SSH2_MSG_CHANNEL_SUCCESS                 99
#define SSH2_MSG_CHANNEL_FAILURE                 100

/* SSH2 miscellaneous constants */
#define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT      1
#define SSH2_DISCONNECT_PROTOCOL_ERROR                   2
#define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED              3
#define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED       4
#define SSH2_DISCONNECT_MAC_ERROR                        5
#define SSH2_DISCONNECT_COMPRESSION_ERROR                6
#define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE            7
#define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED   8
#define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE          9
#define SSH2_DISCONNECT_CONNECTION_LOST                  10
#define SSH2_DISCONNECT_BY_APPLICATION                   11
#define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS             12
#define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER           13
#define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE   14
#define SSH2_DISCONNECT_ILLEGAL_USER_NAME                15

#define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED    1
#define SSH2_OPEN_CONNECT_FAILED                 2
#define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE           3
#define SSH2_OPEN_RESOURCE_SHORTAGE              4

// Terminal Modes
#define SSH2_TTY_OP_END         0
#define SSH2_TTY_KEY_VINTR      1
#define SSH2_TTY_KEY_VQUIT      2
#define SSH2_TTY_KEY_VERASE     3
#define SSH2_TTY_KEY_VKILL      4
#define SSH2_TTY_KEY_VEOF       5
#define SSH2_TTY_KEY_VEOL       6
#define SSH2_TTY_KEY_VEOL2      7
#define SSH2_TTY_KEY_VSTART     8
#define SSH2_TTY_KEY_VSTOP      9
#define SSH2_TTY_KEY_VSUSP      10
#define SSH2_TTY_KEY_VDSUSP     11
#define SSH2_TTY_KEY_VREPRINT   12
#define SSH2_TTY_KEY_VWERASE    13
#define SSH2_TTY_KEY_VLNEXT     14
#define SSH2_TTY_KEY_VFLUSH     15
#define SSH2_TTY_KEY_VSWTCH     16
#define SSH2_TTY_KEY_VSTATUS    17
#define SSH2_TTY_KEY_VDISCARD   18
#define SSH2_TTY_OP_IGNPAR      30
#define SSH2_TTY_OP_PARMRK      31
#define SSH2_TTY_OP_INPCK       32
#define SSH2_TTY_OP_ISTRIP      33
#define SSH2_TTY_OP_INLCR       34
#define SSH2_TTY_OP_IGNCR       35
#define SSH2_TTY_OP_ICRNL       36
#define SSH2_TTY_OP_IUCLC       37
#define SSH2_TTY_OP_IXON        38
#define SSH2_TTY_OP_IXANY       39
#define SSH2_TTY_OP_IXOFF       40
#define SSH2_TTY_OP_IMAXBEL     41
#define SSH2_TTY_OP_ISIG        50
#define SSH2_TTY_OP_ICANON      51
#define SSH2_TTY_OP_XCASE       52
#define SSH2_TTY_OP_ECHO        53
#define SSH2_TTY_OP_ECHOE       54
#define SSH2_TTY_OP_ECHOK       55
#define SSH2_TTY_OP_ECHONL      56
#define SSH2_TTY_OP_NOFLSH      57
#define SSH2_TTY_OP_TOSTOP      58
#define SSH2_TTY_OP_IEXTEN      59
#define SSH2_TTY_OP_ECHOCTL     60
#define SSH2_TTY_OP_ECHOKE      61
#define SSH2_TTY_OP_PENDIN      62
#define SSH2_TTY_OP_OPOST       70
#define SSH2_TTY_OP_OLCUC       71
#define SSH2_TTY_OP_ONLCR       72
#define SSH2_TTY_OP_OCRNL       73
#define SSH2_TTY_OP_ONOCR       74
#define SSH2_TTY_OP_ONLRET      75
#define SSH2_TTY_OP_CS7         90
#define SSH2_TTY_OP_CS8         91
#define SSH2_TTY_OP_PARENB      92
#define SSH2_TTY_OP_PARODD      93
#define SSH2_TTY_OP_ISPEED      128
#define SSH2_TTY_OP_OSPEED      129


// �N���C�A���g�����T�[�o������������
enum kex_init_proposals {
        PROPOSAL_KEX_ALGS,
        PROPOSAL_SERVER_HOST_KEY_ALGS,
        PROPOSAL_ENC_ALGS_CTOS,
        PROPOSAL_ENC_ALGS_STOC,
        PROPOSAL_MAC_ALGS_CTOS,
        PROPOSAL_MAC_ALGS_STOC,
        PROPOSAL_COMP_ALGS_CTOS,
        PROPOSAL_COMP_ALGS_STOC,
        PROPOSAL_LANG_CTOS,
        PROPOSAL_LANG_STOC,
        PROPOSAL_MAX
};

#define KEX_DEFAULT_KEX     ""
#define KEX_DEFAULT_PK_ALG  ""
#define KEX_DEFAULT_ENCRYPT ""
#define KEX_DEFAULT_MAC     ""
#define KEX_DEFAULT_COMP    ""
#define KEX_DEFAULT_LANG    ""

static char *myproposal[PROPOSAL_MAX] = {
        KEX_DEFAULT_KEX,
        KEX_DEFAULT_PK_ALG,
        KEX_DEFAULT_ENCRYPT,
        KEX_DEFAULT_ENCRYPT,
        KEX_DEFAULT_MAC,
        KEX_DEFAULT_MAC,
        KEX_DEFAULT_COMP,
        KEX_DEFAULT_COMP,
        KEX_DEFAULT_LANG,
        KEX_DEFAULT_LANG,
};


typedef enum {
        KEY_NONE,
        KEY_RSA1,
        KEY_RSA,
        KEY_DSA,
        KEY_ECDSA256,
        KEY_ECDSA384,
        KEY_ECDSA521,
        KEY_ED25519,
        KEY_UNSPEC,
        KEY_MAX = KEY_UNSPEC,
} ssh_keytype;
#define isFixedLengthKey(type)  ((type) >= KEY_DSA && (type) <= KEY_ED25519)

typedef struct ssh2_host_key {
        ssh_keytype type;
        char *name;
} ssh2_host_key_t;

static ssh2_host_key_t ssh2_host_key[] = {
        {KEY_RSA1,     "ssh-rsa1"},            // for SSH1 only
        {KEY_RSA,      "ssh-rsa"},             // RFC4253
        {KEY_DSA,      "ssh-dss"},             // RFC4253
        {KEY_ECDSA256, "ecdsa-sha2-nistp256"}, // RFC5656
        {KEY_ECDSA384, "ecdsa-sha2-nistp384"}, // RFC5656
        {KEY_ECDSA521, "ecdsa-sha2-nistp521"}, // RFC5656
        {KEY_ED25519,  "ssh-ed25519"},         // draft-bjh21-ssh-ed25519-02
        {KEY_UNSPEC,   "ssh-unknown"},
        {KEY_NONE,     NULL},
};

/* Minimum modulus size (n) for RSA keys. */
#define SSH_RSA_MINIMUM_MODULUS_SIZE    768

#define SSH_KEYGEN_DEFAULT_BITS   2048
#define SSH_RSA_MINIMUM_KEY_SIZE   768
#define SSH_DSA_MINIMUM_KEY_SIZE  1024

#define SSH_KEYGEN_MINIMUM_ROUNDS       1
#define SSH_KEYGEN_MAXIMUM_ROUNDS INT_MAX


typedef struct ssh2_cipher {
        SSHCipher cipher;
        char *name;
        int block_size;
        int key_len;
        int discard_len;
        const EVP_CIPHER *(*func)(void);
} ssh2_cipher_t;

static ssh2_cipher_t ssh2_ciphers[] = {
        {SSH2_CIPHER_3DES_CBC,        "3des-cbc",         8, 24,    0, EVP_des_ede3_cbc},     // RFC4253
        {SSH2_CIPHER_AES128_CBC,      "aes128-cbc",      16, 16,    0, EVP_aes_128_cbc},      // RFC4253
        {SSH2_CIPHER_AES192_CBC,      "aes192-cbc",      16, 24,    0, EVP_aes_192_cbc},      // RFC4253
        {SSH2_CIPHER_AES256_CBC,      "aes256-cbc",      16, 32,    0, EVP_aes_256_cbc},      // RFC4253
        {SSH2_CIPHER_BLOWFISH_CBC,    "blowfish-cbc",     8, 16,    0, EVP_bf_cbc},           // RFC4253
        {SSH2_CIPHER_AES128_CTR,      "aes128-ctr",      16, 16,    0, evp_aes_128_ctr},      // RFC4344
        {SSH2_CIPHER_AES192_CTR,      "aes192-ctr",      16, 24,    0, evp_aes_128_ctr},      // RFC4344
        {SSH2_CIPHER_AES256_CTR,      "aes256-ctr",      16, 32,    0, evp_aes_128_ctr},      // RFC4344
        {SSH2_CIPHER_ARCFOUR,         "arcfour",          8, 16,    0, EVP_rc4},              // RFC4253
        {SSH2_CIPHER_ARCFOUR128,      "arcfour128",       8, 16, 1536, EVP_rc4},              // RFC4345
        {SSH2_CIPHER_ARCFOUR256,      "arcfour256",       8, 32, 1536, EVP_rc4},              // RFC4345
        {SSH2_CIPHER_CAST128_CBC,     "cast128-cbc",      8, 16,    0, EVP_cast5_cbc},        // RFC4253
        {SSH2_CIPHER_3DES_CTR,        "3des-ctr",         8, 24,    0, evp_des3_ctr},         // RFC4344
        {SSH2_CIPHER_BLOWFISH_CTR,    "blowfish-ctr",     8, 32,    0, evp_bf_ctr},           // RFC4344
        {SSH2_CIPHER_CAST128_CTR,     "cast128-ctr",      8, 16,    0, evp_cast5_ctr},        // RFC4344
        {SSH2_CIPHER_CAMELLIA128_CBC, "camellia128-cbc", 16, 16,    0, EVP_camellia_128_cbc}, // draft-kanno-secsh-camellia-02
        {SSH2_CIPHER_CAMELLIA192_CBC, "camellia192-cbc", 16, 24,    0, EVP_camellia_192_cbc}, // draft-kanno-secsh-camellia-02
        {SSH2_CIPHER_CAMELLIA256_CBC, "camellia256-cbc", 16, 32,    0, EVP_camellia_256_cbc}, // draft-kanno-secsh-camellia-02
        {SSH2_CIPHER_CAMELLIA128_CTR, "camellia128-ctr", 16, 16,    0, evp_camellia_128_ctr}, // draft-kanno-secsh-camellia-02
        {SSH2_CIPHER_CAMELLIA192_CTR, "camellia192-ctr", 16, 24,    0, evp_camellia_128_ctr}, // draft-kanno-secsh-camellia-02
        {SSH2_CIPHER_CAMELLIA256_CTR, "camellia256-ctr", 16, 32,    0, evp_camellia_128_ctr}, // draft-kanno-secsh-camellia-02
#ifdef WITH_CAMELLIA_PRIVATE
        {SSH2_CIPHER_CAMELLIA128_CBC, "camellia128-cbc@openssh.org", 16, 16, 0, EVP_camellia_128_cbc},
        {SSH2_CIPHER_CAMELLIA192_CBC, "camellia192-cbc@openssh.org", 16, 24, 0, EVP_camellia_192_cbc},
        {SSH2_CIPHER_CAMELLIA256_CBC, "camellia256-cbc@openssh.org", 16, 32, 0, EVP_camellia_256_cbc},
        {SSH2_CIPHER_CAMELLIA128_CTR, "camellia128-ctr@openssh.org", 16, 16, 0, evp_camellia_128_ctr},
        {SSH2_CIPHER_CAMELLIA192_CTR, "camellia192-ctr@openssh.org", 16, 24, 0, evp_camellia_128_ctr},
        {SSH2_CIPHER_CAMELLIA256_CTR, "camellia256-ctr@openssh.org", 16, 32, 0, evp_camellia_128_ctr},
#endif // WITH_CAMELLIA_PRIVATE
        {SSH_CIPHER_NONE,          NULL,            0,  0, 0,    NULL},
};


typedef enum {
        KEX_DH_NONE,       /* disabled line */
        KEX_DH_GRP1_SHA1,
        KEX_DH_GRP14_SHA1,
        KEX_DH_GEX_SHA1,
        KEX_DH_GEX_SHA256,
        KEX_ECDH_SHA2_256,
        KEX_ECDH_SHA2_384,
        KEX_ECDH_SHA2_521,
        KEX_DH_GRP14_SHA256,
        KEX_DH_GRP16_SHA512,
        KEX_DH_GRP18_SHA512,
        KEX_DH_UNKNOWN,
        KEX_DH_MAX = KEX_DH_UNKNOWN,
} kex_algorithm;

typedef struct ssh2_kex_algorithm {
        kex_algorithm kextype;
        char *name;
        const EVP_MD *(*evp_md)(void);
} ssh2_kex_algorithm_t;

static ssh2_kex_algorithm_t ssh2_kex_algorithms[] = {
        {KEX_DH_GRP1_SHA1,  "diffie-hellman-group1-sha1",           EVP_sha1},   // RFC4253
        {KEX_DH_GRP14_SHA1, "diffie-hellman-group14-sha1",          EVP_sha1},   // RFC4253
        {KEX_DH_GEX_SHA1,   "diffie-hellman-group-exchange-sha1",   EVP_sha1},   // RFC4419
        {KEX_DH_GEX_SHA256, "diffie-hellman-group-exchange-sha256", EVP_sha256}, // RFC4419
        {KEX_ECDH_SHA2_256, "ecdh-sha2-nistp256",                   EVP_sha256}, // RFC5656
        {KEX_ECDH_SHA2_384, "ecdh-sha2-nistp384",                   EVP_sha384}, // RFC5656
        {KEX_ECDH_SHA2_521, "ecdh-sha2-nistp521",                   EVP_sha512}, // RFC5656
        {KEX_DH_GRP14_SHA256, "diffie-hellman-group14-sha256",      EVP_sha256}, // draft-baushke-ssh-dh-group-sha2-04
        {KEX_DH_GRP16_SHA512, "diffie-hellman-group16-sha512",      EVP_sha512}, // draft-baushke-ssh-dh-group-sha2-04
        {KEX_DH_GRP18_SHA512, "diffie-hellman-group18-sha512",      EVP_sha512}, // draft-baushke-ssh-dh-group-sha2-04
        {KEX_DH_NONE      , NULL,                                   NULL},
};


typedef enum {
        HMAC_NONE,      /* disabled line */
        HMAC_SHA1,
        HMAC_MD5,
        HMAC_SHA1_96,
        HMAC_MD5_96,
        HMAC_RIPEMD160,
        HMAC_SHA2_256,
        HMAC_SHA2_256_96,
        HMAC_SHA2_512,
        HMAC_SHA2_512_96,
        HMAC_UNKNOWN,
        HMAC_MAX = HMAC_UNKNOWN,
} hmac_type;

typedef struct ssh2_mac {
        hmac_type type;
        char *name;
        const EVP_MD *(*evp_md)(void);
        int truncatebits;
} ssh2_mac_t;

static ssh2_mac_t ssh2_macs[] = {
        {HMAC_SHA1,        "hmac-sha1",                  EVP_sha1,      0},  // RFC4253
        {HMAC_MD5,         "hmac-md5",                   EVP_md5,       0},  // RFC4253
        {HMAC_SHA1_96,     "hmac-sha1-96",               EVP_sha1,      96}, // RFC4253
        {HMAC_MD5_96,      "hmac-md5-96",                EVP_md5,       96}, // RFC4253
        {HMAC_RIPEMD160,   "hmac-ripemd160@openssh.com", EVP_ripemd160, 0},
        {HMAC_SHA2_256,    "hmac-sha2-256",              EVP_sha256,    0},  // RFC6668
//      {HMAC_SHA2_256_96, "hmac-sha2-256-96",           EVP_sha256,    96}, // draft-dbider-sha2-mac-for-ssh-05, deleted at 06
        {HMAC_SHA2_512,    "hmac-sha2-512",              EVP_sha512,    0},  // RFC6668
//      {HMAC_SHA2_512_96, "hmac-sha2-512-96",           EVP_sha512,    96}, // draft-dbider-sha2-mac-for-ssh-05, deleted at 06
        {HMAC_NONE,        NULL,                         NULL,          0},
};


typedef enum {
        COMP_NONE,      /* disabled line */
        COMP_NOCOMP,
        COMP_ZLIB,
        COMP_DELAYED,
        COMP_UNKNOWN,
        COMP_MAX = COMP_UNKNOWN,
} compression_type;

typedef struct ssh2_comp {
        compression_type type;
        char *name;
} ssh2_comp_t;

static ssh2_comp_t ssh2_comps[] = {
        {COMP_NOCOMP,  "none"},             // RFC4253
        {COMP_ZLIB,    "zlib"},             // RFC4253
        {COMP_DELAYED, "zlib@openssh.com"},
        {COMP_NONE,    NULL},
};


struct Enc {
        u_char          *key;
        u_char          *iv;
        unsigned int    key_len;
        unsigned int    block_size;
};

struct Mac {
        char            *name; 
        int             enabled; 
        const EVP_MD    *md;
        int             mac_len; 
        u_char          *key;
        int             key_len;
};

struct Comp {
        int     type;
        int     enabled;
        char    *name;
};

typedef struct {
        struct Enc  enc;
        struct Mac  mac;
        struct Comp comp;
} Newkeys;

#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))

enum kex_modes {
        MODE_IN,
        MODE_OUT,
        MODE_MAX
};


// �z�X�g�L�[(SSH1, SSH2����)���f�[�^�\�� (2006.3.21 yutaka)
typedef struct Key {
        // host key type
        ssh_keytype type;
        // SSH2 RSA
        RSA *rsa;
        // SSH2 DSA
        DSA *dsa;
        // SSH2 ECDSA
        EC_KEY *ecdsa;
        // SSH1 RSA
        int bits;
        unsigned char *exp;
        unsigned char *mod;
        // SSH2 ED25519
        unsigned char *ed25519_sk;
        unsigned char *ed25519_pk;
        int bcrypt_kdf;
} Key;

// fingerprint������
enum fp_rep {
        SSH_FP_DEFAULT = 0,
        SSH_FP_HEX,
        SSH_FP_BASE64,
        SSH_FP_BUBBLEBABBLE,
        SSH_FP_RANDOMART
};
/*
enum fp_type {
        SSH_FP_MD5,
        SSH_FP_SHA1,
        SSH_FP_SHA256
};
*/
typedef enum {
        SSH_DIGEST_MD5,
        SSH_DIGEST_RIPEMD160,
        SSH_DIGEST_SHA1,
        SSH_DIGEST_SHA256,
        SSH_DIGEST_SHA384,
        SSH_DIGEST_SHA512,
        SSH_DIGEST_MAX,
} digest_algorithm;

typedef struct ssh_digest {
        digest_algorithm id;
        char *name;
} ssh_digest_t;

/* NB. Indexed directly by algorithm number */
static ssh_digest_t ssh_digests[] = {
        { SSH_DIGEST_MD5,       "MD5" },
        { SSH_DIGEST_RIPEMD160, "RIPEMD160" },
        { SSH_DIGEST_SHA1,      "SHA1" },
        { SSH_DIGEST_SHA256,    "SHA256" },
        { SSH_DIGEST_SHA384,    "SHA384" },
        { SSH_DIGEST_SHA512,    "SHA512" },
        { SSH_DIGEST_MAX,       NULL },
};

enum scp_dir {
        TOREMOTE, FROMREMOTE,
};

/* The packet handler returns TRUE to keep the handler in place,
   FALSE to remove the handler. */
typedef BOOL (* SSHPacketHandler)(PTInstVar pvar);

typedef struct _SSHPacketHandlerItem SSHPacketHandlerItem;
struct _SSHPacketHandlerItem {
        SSHPacketHandler handler;
        /* Circular list of handlers for given message */
        SSHPacketHandlerItem *next_for_message;
        SSHPacketHandlerItem *last_for_message;
        /* Circular list of handlers in set */
        SSHPacketHandlerItem *next_in_set;
        int active_for_message;
};

typedef struct {
        char *hostname;

        int server_protocol_flags;
        char *server_ID;

        /* This buffer is used to hold the outgoing data, and encrypted in-place
           here if necessary. */
        unsigned char *outbuf;
        long outbuflen;
        /* This buffer is used by the SSH protocol processing to store uncompressed
           packet data for compression. User data is never streamed through here;
           it is compressed directly from the user's buffer. */
        unsigned char *precompress_outbuf;
        long precompress_outbuflen;
        /* this is the length of the packet data, including the type header */
        long outgoing_packet_len;

        /* This buffer is used by the SSH protocol processing to store decompressed
           packet data. User data is never streamed through here; it is decompressed
           directly to the user's buffer. */
        unsigned char *postdecompress_inbuf;
        long postdecompress_inbuflen;

        unsigned char *payload;
        long payload_grabbed;
        long payloadlen;
        long payload_datastart;
        long payload_datalen;

        uint32 receiver_sequence_number;
        uint32 sender_sequence_number;

        z_stream compress_stream;
        z_stream decompress_stream;
        BOOL compressing;
        BOOL decompressing;
        int compression_level;

        SSHPacketHandlerItem *packet_handlers[256];
        int status_flags;

        int win_cols;
        int win_rows;

        unsigned short tcpport;
} SSHState;

#define STATUS_DONT_SEND_USER_NAME            0x01
#define STATUS_EXPECTING_COMPRESSION_RESPONSE 0x02
#define STATUS_DONT_SEND_CREDENTIALS          0x04
#define STATUS_HOST_OK                        0x08
#define STATUS_INTERACTIVE                    0x10
#define STATUS_IN_PARTIAL_ID_STRING           0x20

void SSH_init(PTInstVar pvar);
void SSH_open(PTInstVar pvar);
void SSH_notify_disconnecting(PTInstVar pvar, char *reason);
/* SSH_handle_server_ID returns TRUE iff a valid ID string has been
   received. If it returns FALSE, we need to keep looking for another
   ID string. */
BOOL SSH_handle_server_ID(PTInstVar pvar, char *ID, int ID_len);
/* SSH_handle_packet requires NO PAYLOAD on entry.
   'len' is the size of the packet: payload + padding (+ CRC for SSHv1)
   'padding' is the size of the padding.
   'data' points to the start of the packet data (the length field)
*/
void SSH_handle_packet(PTInstVar pvar, char *data, int len, int padding);
void SSH_notify_win_size(PTInstVar pvar, int cols, int rows);
void SSH_notify_user_name(PTInstVar pvar);
void SSH_notify_cred(PTInstVar pvar);
void SSH_notify_host_OK(PTInstVar pvar);
void SSH_send(PTInstVar pvar, unsigned char const *buf, unsigned int buflen);
/* SSH_extract_payload returns number of bytes extracted */
int SSH_extract_payload(PTInstVar pvar, unsigned char *dest, int len);
void SSH_end(PTInstVar pvar);

void SSH_get_server_ID_info(PTInstVar pvar, char *dest, int len);
void SSH_get_protocol_version_info(PTInstVar pvar, char *dest, int len);
void SSH_get_compression_info(PTInstVar pvar, char *dest, int len);
void SSH_get_mac_info(PTInstVar pvar, char *dest, int len);

/* len must be <= SSH_MAX_SEND_PACKET_SIZE */
void SSH_channel_send(PTInstVar pvar, int channel_num,
                      uint32 remote_channel_num,
                      unsigned char *buf, int len, int retry);
void SSH_fail_channel_open(PTInstVar pvar, uint32 remote_channel_num);
void SSH_confirm_channel_open(PTInstVar pvar, uint32 remote_channel_num, uint32 local_channel_num);
void SSH_channel_output_eof(PTInstVar pvar, uint32 remote_channel_num);
void SSH_channel_input_eof(PTInstVar pvar, uint32 remote_channel_num, uint32 local_channel_num);
void SSH_request_forwarding(PTInstVar pvar, char *bind_address, int from_server_port,
                            char *to_local_host, int to_local_port);
void SSH_cancel_request_forwarding(PTInstVar pvar, char *bind_address, int from_server_port, int reply);
void SSH_request_X11_forwarding(PTInstVar pvar,
  char *auth_protocol, unsigned char *auth_data, int auth_data_len, int screen_num);
void SSH_open_channel(PTInstVar pvar, uint32 local_channel_num,
                      char *to_remote_host, int to_remote_port,
                      char *originator, unsigned short originator_port);

int SSH_start_scp(PTInstVar pvar, char *sendfile, char *dstfile);
int SSH_start_scp_receive(PTInstVar pvar, char *filename);
int SSH_scp_transaction(PTInstVar pvar, char *sendfile, char *dstfile, enum scp_dir direction);
int SSH_sftp_transaction(PTInstVar pvar);

/* auxiliary SSH2 interfaces for pkt.c */
int SSH_get_min_packet_size(PTInstVar pvar);
/* data is guaranteed to be at least SSH_get_min_packet_size bytes long
   at least 5 bytes must be decrypted */
void SSH_predecrpyt_packet(PTInstVar pvar, char *data);
int SSH_get_clear_MAC_size(PTInstVar pvar);

#define SSH_is_any_payload(pvar) ((pvar)->ssh_state.payload_datalen > 0)
#define SSH_get_host_name(pvar) ((pvar)->ssh_state.hostname)
#define SSH_get_compression_level(pvar) ((pvar)->ssh_state.compressing ? (pvar)->ts_SSH_CompressionLevel : 0)

void SSH2_send_kexinit(PTInstVar pvar);
BOOL do_SSH2_userauth(PTInstVar pvar);
BOOL do_SSH2_authrequest(PTInstVar pvar);
void debug_print(int no, char *msg, int len);
int get_cipher_block_size(SSHCipher cipher);
int get_cipher_key_len(SSHCipher cipher);
SSHCipher get_cipher_by_name(char *name);
char* get_kex_algorithm_name(kex_algorithm kextype);
const EVP_CIPHER* get_cipher_EVP_CIPHER(SSHCipher cipher);
const EVP_MD* get_kex_algorithm_EVP_MD(kex_algorithm kextype);
char* get_ssh2_mac_name(hmac_type type);
const EVP_MD* get_ssh2_mac_EVP_MD(hmac_type type);
int get_ssh2_mac_truncatebits(hmac_type type);
char* get_ssh2_comp_name(compression_type type);
char* get_ssh_keytype_name(ssh_keytype type);
char* get_digest_algorithm_name(digest_algorithm id);
int get_cipher_discard_len(SSHCipher cipher);
void ssh_heartbeat_lock_initialize(void);
void ssh_heartbeat_lock_finalize(void);
void ssh_heartbeat_lock(void);
void ssh_heartbeat_unlock(void);
void halt_ssh_heartbeat_thread(PTInstVar pvar);
void ssh2_channel_free(void);
BOOL handle_SSH2_userauth_msg60(PTInstVar pvar);
BOOL handle_SSH2_userauth_inforeq(PTInstVar pvar);
BOOL handle_SSH2_userauth_pkok(PTInstVar pvar);
BOOL handle_SSH2_userauth_passwd_changereq(PTInstVar pvar);
void SSH2_update_compression_myproposal(PTInstVar pvar);
void SSH2_update_cipher_myproposal(PTInstVar pvar);
void SSH2_update_kex_myproposal(PTInstVar pvar);
void SSH2_update_host_key_myproposal(PTInstVar pvar);
void SSH2_update_hmac_myproposal(PTInstVar pvar);
int SSH_notify_break_signal(PTInstVar pvar);

///
enum scp_state {
        SCP_INIT, SCP_TIMESTAMP, SCP_FILEINFO, SCP_DATA, SCP_CLOSING,
};

typedef struct bufchain {
        buffer_t *msg;
        struct bufchain *next;
} bufchain_t;

typedef struct PacketList {
        char *buf;
        unsigned int buflen;
        struct PacketList *next;
} PacketList_t;

typedef struct scp {
        enum scp_dir dir;              // transfer direction
        enum scp_state state;          // SCP state 
        char localfile[MAX_PATH];      // local filename
        char localfilefull[MAX_PATH];  // local filename fullpath
        char remotefile[MAX_PATH];     // remote filename
        FILE *localfp;                 // file pointer for local file
        struct __stat64 filestat;      // file status information
        HWND progress_window;
        HANDLE thread;
        unsigned int thread_id;
        PTInstVar pvar;
        // for receiving file
        long long filetotalsize;
        long long filercvsize;
        DWORD filemtime;
        DWORD fileatime;
        PacketList_t *pktlist_head;
        PacketList_t *pktlist_tail;
} scp_t;

enum sftp_state {
        SFTP_INIT, SFTP_CONNECTED, SFTP_REALPATH, 
};

typedef struct sftp {
        enum sftp_state state;
        HWND console_window;
        unsigned int transfer_buflen;
        unsigned int num_requests;
        unsigned int version;
        unsigned int msg_id;
#define SFTP_EXT_POSIX_RENAME   0x00000001
#define SFTP_EXT_STATVFS    0x00000002
#define SFTP_EXT_FSTATVFS   0x00000004
#define SFTP_EXT_HARDLINK   0x00000008
        unsigned int exts;
        unsigned long long limit_kbps;
        //struct bwlimit bwlimit_in, bwlimit_out;
        char path[1024];
} sftp_t;

typedef struct channel {
        int used;
        int self_id;
        int remote_id;
        unsigned int local_window;
        unsigned int local_window_max;
        unsigned int local_consumed;
        unsigned int local_maxpacket;
        unsigned int remote_window;
        unsigned int remote_maxpacket;
        enum channel_type type;
        int local_num;
        bufchain_t *bufchain;
        scp_t scp;
        buffer_t *agent_msg;
        int agent_request_len;
        sftp_t sftp;
#define SSH_CHANNEL_STATE_CLOSE_SENT 0x00000001
        unsigned int state;
} Channel_t;

unsigned char *begin_send_packet(PTInstVar pvar, int type, int len);
void finish_send_packet_special(PTInstVar pvar, int skip_compress);
void SSH2_send_channel_data(PTInstVar pvar, Channel_t *c, unsigned char *buf, unsigned int buflen, int retry);

#define finish_send_packet(pvar) finish_send_packet_special((pvar), 0)
#define get_payload_uint32(pvar, offset) get_uint32_MSBfirst((pvar)->ssh_state.payload + (offset))
#define get_uint32(buf) get_uint32_MSBfirst((buf))
#define set_uint32(buf, v) set_uint32_MSBfirst((buf), (v))
#define get_mpint_len(pvar, offset) ((get_ushort16_MSBfirst((pvar)->ssh_state.payload + (offset)) + 7) >> 3)
#define get_ushort16(buf) get_ushort16_MSBfirst((buf))
///

/* Global request confirmation callbacks */
typedef void global_confirm_cb(PTInstVar pvar, int type, unsigned int seq, void *ctx);
void client_register_global_confirm(global_confirm_cb *cb, void *ctx);

/* Global request success/failure callbacks */
struct global_confirm {
        global_confirm_cb *cb;
        void *ctx;
        int ref_count;
};

#endif