suricata 7.0.0-alpha.1

/* Copyright (C) 2020 Open Information Security Foundation
 *
 * You can copy, redistribute or modify this Program under the terms of
 * the GNU General Public License version 2 as published by the Free
 * Software Foundation.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

use nom::combinator::rest;
use nom::number::streaming::{be_u32, be_u8};
use md5::Md5;
use digest::Digest;
use std::fmt;

#[derive(PartialEq, Eq, Copy, Clone, Debug)]
pub enum MessageCode {
	SshMsgDisconnect,
	SshMsgIgnore,
	SshMsgUnimplemented,
	SshMsgDebug,
	SshMsgServiceRequest,
	SshMsgServiceAccept,
	SshMsgKexinit,
	SshMsgNewKeys,
	SshMsgKexdhInit,
	SshMsgKexdhReply,
	
	SshMsgUndefined(u8),
}

impl MessageCode {
    fn from_u8(value: u8) -> MessageCode {
        match value {
            1 => MessageCode::SshMsgDisconnect,
            2 => MessageCode::SshMsgIgnore,
            3 => MessageCode::SshMsgUnimplemented,
            4 => MessageCode::SshMsgDebug,
            5 => MessageCode::SshMsgServiceRequest,
            6 => MessageCode::SshMsgServiceAccept,
            20 => MessageCode::SshMsgKexinit,
            21 => MessageCode::SshMsgNewKeys,
            30 => MessageCode::SshMsgKexdhInit,
            31 => MessageCode::SshMsgKexdhReply,
            _ => MessageCode::SshMsgUndefined(value),
        }
    }
}

#[inline]
fn is_not_lineend(b: u8) -> bool {
    if b == 10 || b == 13 {
        return false;
    }
    return true;
}

//may leave \r at the end to be removed
named!(pub ssh_parse_line<&[u8], &[u8]>,
    terminated!(
        take_while!(is_not_lineend),
        alt!( tag!("\n") | tag!("\r\n") |
              do_parse!(
                    bytes: tag!("\r") >>
                    not!(eof!()) >> (bytes)
                )
            )
    )
);

#[derive(PartialEq)]
pub struct SshBanner<'a> {
    pub protover: &'a [u8],
    pub swver: &'a [u8],
}

// Could be simplified adding dummy \n at the end
// or use nom5 nom::bytes::complete::is_not
named!(pub ssh_parse_banner<SshBanner>,
    do_parse!(
        tag!("SSH-") >>
        protover: is_not!("-") >>
        char!('-') >>
        swver: alt!( complete!( is_not!(" \r\n") ) | rest ) >>
        //remaining after space is comments
        (SshBanner{protover, swver})
    )
);

#[derive(PartialEq)]
pub struct SshRecordHeader {
    pub pkt_len: u32,
    padding_len: u8,
    pub msg_code: MessageCode,
}

impl fmt::Display for SshRecordHeader {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(
            f,
            "(pkt_len:{}, padding_len:{}, msg_code:{:?})",
            self.pkt_len, self.padding_len, self.msg_code
        )
    }
}

named!(pub ssh_parse_record_header<SshRecordHeader>,
    do_parse!(
        pkt_len: verify!(be_u32, |&val| val > 1) >>
        padding_len: be_u8 >>
        msg_code: be_u8 >>
        (SshRecordHeader{pkt_len: pkt_len,
            padding_len: padding_len,
            msg_code: MessageCode::from_u8(msg_code)})
    )
);

//test for evasion against pkt_len=0or1...
named!(pub ssh_parse_record<SshRecordHeader>,
    do_parse!(
        pkt_len: verify!(be_u32, |&val| val > 1) >>
        padding_len: be_u8 >>
        msg_code: be_u8 >>
        take!((pkt_len-2) as usize) >>
        (SshRecordHeader{pkt_len: pkt_len,
            padding_len: padding_len,
            msg_code: MessageCode::from_u8(msg_code)})
    )
);

#[derive(Debug,PartialEq)]
pub struct SshPacketKeyExchange<'a> {
    pub cookie: &'a[u8],
    pub kex_algs: &'a [u8],
    pub server_host_key_algs: &'a [u8],
    pub encr_algs_client_to_server: &'a [u8],
    pub encr_algs_server_to_client: &'a [u8],
    pub mac_algs_client_to_server: &'a [u8],
    pub mac_algs_server_to_client: &'a [u8],
    pub comp_algs_client_to_server: &'a [u8],
    pub comp_algs_server_to_client: &'a [u8],
    pub langs_client_to_server: &'a [u8],
    pub langs_server_to_client: &'a [u8],
    pub first_kex_packet_follows: u8,
    pub reserved: u32,
}

const SSH_HASSH_STRING_DELIMITER_SLICE: [u8; 1] = [b';'];

impl<'a> SshPacketKeyExchange<'a> {
    pub fn generate_hassh(&self, hassh_string: &mut Vec<u8>, hassh: &mut Vec<u8>, to_server: &bool) {
        let slices = if *to_server { 
            [self.kex_algs, &SSH_HASSH_STRING_DELIMITER_SLICE,
             self.encr_algs_server_to_client, &SSH_HASSH_STRING_DELIMITER_SLICE,
             self.mac_algs_server_to_client, &SSH_HASSH_STRING_DELIMITER_SLICE,
             self.comp_algs_server_to_client]}
        else {
            [self.kex_algs, &SSH_HASSH_STRING_DELIMITER_SLICE,
             self.encr_algs_client_to_server, &SSH_HASSH_STRING_DELIMITER_SLICE,
             self.mac_algs_client_to_server, &SSH_HASSH_STRING_DELIMITER_SLICE,
             self.comp_algs_client_to_server]
        };
        // reserving memory
        hassh_string.reserve_exact(slices.iter().fold(0, |acc, x| acc + x.len()));
        // copying slices to hassh string
        slices.iter().for_each(|&x| hassh_string.extend_from_slice(x)); 
        hassh.extend(format!("{:x}", Md5::new().chain(&hassh_string).finalize()).as_bytes());
    }
}

named!(parse_string<&[u8]>, do_parse!(
    len: be_u32 >>
    string: take!(len) >>
    ( string )
));

named!(pub ssh_parse_key_exchange<SshPacketKeyExchange>, do_parse!(
    cookie: take!(16) >>
    kex_algs: parse_string >>
    server_host_key_algs: parse_string >>
    encr_algs_client_to_server: parse_string >>
    encr_algs_server_to_client: parse_string >>
    mac_algs_client_to_server: parse_string >>
    mac_algs_server_to_client: parse_string >>
    comp_algs_client_to_server: parse_string >>
    comp_algs_server_to_client: parse_string >>
    langs_client_to_server: parse_string >>
    langs_server_to_client: parse_string >>
    first_kex_packet_follows: be_u8 >>
    reserved: be_u32 >>
    ( SshPacketKeyExchange {
        cookie: cookie,
        kex_algs: kex_algs,
        server_host_key_algs: server_host_key_algs,
        encr_algs_client_to_server: encr_algs_client_to_server,
        encr_algs_server_to_client: encr_algs_server_to_client,
        mac_algs_client_to_server: mac_algs_client_to_server,
        mac_algs_server_to_client: mac_algs_server_to_client,
        comp_algs_client_to_server: comp_algs_client_to_server,
        comp_algs_server_to_client: comp_algs_server_to_client,
        langs_client_to_server: langs_client_to_server,
        langs_server_to_client: langs_server_to_client,
        first_kex_packet_follows: first_kex_packet_follows,
        reserved: reserved,
    } )
));

#[cfg(test)]
mod tests {

    use super::*;

    /// Simple test of some valid data.
    #[test]
    fn test_ssh_parse_banner() {
        let buf = b"SSH-Single-";
        let result = ssh_parse_banner(buf);
        match result {
            Ok((_, message)) => {
                // Check the first message.
                assert_eq!(message.protover, b"Single");
                assert_eq!(message.swver, b"");
            }
            Err(err) => {
                panic!("Result should not be an error: {:?}.", err);
            }
        }
        let buf2 = b"SSH-2.0-Soft";
        let result2 = ssh_parse_banner(buf2);
        match result2 {
            Ok((_, message)) => {
                // Check the first message.
                assert_eq!(message.protover, b"2.0");
                assert_eq!(message.swver, b"Soft");
            }
            Err(err) => {
                panic!("Result should not be an error: {:?}.", err);
            }
        }
    }

    #[test]
    fn test_parse_line() {
        let buf = b"SSH-Single\n";
        let result = ssh_parse_line(buf);
        match result {
            Ok((_, message)) => {
                // Check the first message.
                assert_eq!(message, b"SSH-Single");
            }
            Err(err) => {
                panic!("Result should not be an error: {:?}.", err);
            }
        }
        let buf2 = b"SSH-Double\r\n";
        let result2 = ssh_parse_line(buf2);
        match result2 {
            Ok((_, message)) => {
                // Check the first message.
                assert_eq!(message, b"SSH-Double");
            }
            Err(err) => {
                panic!("Result should not be an error: {:?}.", err);
            }
        }
        let buf3 = b"SSH-Oops\rMore\r\n";
        let result3 = ssh_parse_line(buf3);
        match result3 {
            Ok((rem, message)) => {
                // Check the first message.
                assert_eq!(message, b"SSH-Oops");
                assert_eq!(rem, b"More\r\n");
            }
            Err(err) => {
                panic!("Result should not be an error: {:?}.", err);
            }
        }
        let buf4 = b"SSH-Miss\r";
        let result4 = ssh_parse_line(buf4);
        match result4 {
            Ok((_, _)) => {
                panic!("Expected incomplete result");
            }
            Err(nom::Err::Incomplete(_)) => {
                //OK
                assert_eq!(1, 1);
            }
            Err(err) => {
                panic!("Result should not be an error: {:?}.", err);
            }
        }
        let buf5 = b"\n";
        let result5 = ssh_parse_line(buf5);
        match result5 {
            Ok((_, message)) => {
                // Check empty line
                assert_eq!(message, b"");
            }
            Err(err) => {
                panic!("Result should not be an error: {:?}.", err);
            }
        }
    }
    #[test]
    fn test_parse_key_exchange() {
        let client_key_exchange = [0x18 ,0x70 ,0xCB ,0xA4 ,0xA3 ,0xD4 ,0xDC ,0x88 ,0x6F 
        ,0xFD ,0x76 ,0x06 ,0xCF ,0x36 ,0x1B ,0xC6 ,0x00 ,0x00 ,0x01 ,0x0D ,0x63 ,0x75 ,0x72 ,0x76 
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        ,0x68 ,0x2E ,0x63 ,0x6F ,0x6D ,0x2C ,0x7A ,0x6C ,0x69 ,0x62 ,0x00 ,0x00 ,0x00 ,0x1A ,0x6E 
        ,0x6F ,0x6E ,0x65 ,0x2C ,0x7A ,0x6C ,0x69 ,0x62 ,0x40 ,0x6F ,0x70 ,0x65 ,0x6E ,0x73 ,0x73 
        ,0x68 ,0x2E ,0x63 ,0x6F ,0x6D ,0x2C ,0x7A ,0x6C ,0x69 ,0x62 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00];
        let cookie = [0x18, 0x70, 0xcb, 0xa4, 0xa3, 0xd4, 0xdc, 0x88, 0x6f, 0xfd, 0x76, 0x06, 0xcf, 0x36, 0x1b, 0xc6];
        let key_exchange = SshPacketKeyExchange {
            cookie: &cookie,
            kex_algs: b"curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c",
            server_host_key_algs: b"ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa",
            encr_algs_client_to_server: b"chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com",
            encr_algs_server_to_client: b"chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com",
            mac_algs_client_to_server: b"umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1",
            mac_algs_server_to_client: b"umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1",
            comp_algs_client_to_server: b"none,zlib@openssh.com,zlib",
            comp_algs_server_to_client: b"none,zlib@openssh.com,zlib",
            langs_client_to_server: b"",
            langs_server_to_client: b"",
            first_kex_packet_follows: 0,
            reserved: 0,
        };

        let expected = Ok((b"" as &[u8], key_exchange));
        let res = ssh_parse_key_exchange(&client_key_exchange);
        assert_eq!(res, expected);
    }

    #[test]
    fn test_parse_hassh() {
        let client_key_exchange = [0x18 ,0x70 ,0xCB ,0xA4 ,0xA3 ,0xD4 ,0xDC ,0x88 ,0x6F 
        ,0xFD ,0x76 ,0x06 ,0xCF ,0x36 ,0x1B ,0xC6 ,0x00 ,0x00 ,0x01 ,0x0D ,0x63 ,0x75 ,0x72 ,0x76 
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        ,0x75 ,0x72 ,0x76 ,0x65 ,0x32 ,0x35 ,0x35 ,0x31 ,0x39 ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 ,0x35 
        ,0x36 ,0x40 ,0x6C ,0x69 ,0x62 ,0x73 ,0x73 ,0x68 ,0x2E ,0x6F ,0x72 ,0x67 ,0x2C ,0x65 ,0x63 
        ,0x64 ,0x68 ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 ,0x2D ,0x6E ,0x69 ,0x73 ,0x74 ,0x70 ,0x32 ,0x35 
        ,0x36 ,0x2C ,0x65 ,0x63 ,0x64 ,0x68 ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 ,0x2D ,0x6E ,0x69 ,0x73 
        ,0x74 ,0x70 ,0x33 ,0x38 ,0x34 ,0x2C ,0x65 ,0x63 ,0x64 ,0x68 ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 
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        ,0x65 ,0x2D ,0x68 ,0x65 ,0x6C ,0x6C ,0x6D ,0x61 ,0x6E ,0x2D ,0x67 ,0x72 ,0x6F ,0x75 ,0x70 
        ,0x2D ,0x65 ,0x78 ,0x63 ,0x68 ,0x61 ,0x6E ,0x67 ,0x65 ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 ,0x35 
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        ,0x32 ,0x2C ,0x64 ,0x69 ,0x66 ,0x66 ,0x69 ,0x65 ,0x2D ,0x68 ,0x65 ,0x6C ,0x6C ,0x6D ,0x61 
        ,0x6E ,0x2D ,0x67 ,0x72 ,0x6F ,0x75 ,0x70 ,0x31 ,0x38 ,0x2D ,0x73 ,0x68 ,0x61 ,0x35 ,0x31 
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        ,0x70 ,0x65 ,0x6E ,0x73 ,0x73 ,0x68 ,0x2E ,0x63 ,0x6F ,0x6D ,0x2C ,0x68 ,0x6D ,0x61 ,0x63 
        ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 ,0x2D ,0x35 ,0x31 ,0x32 ,0x2D ,0x65 ,0x74 ,0x6D ,0x40 ,0x6F 
        ,0x70 ,0x65 ,0x6E ,0x73 ,0x73 ,0x68 ,0x2E ,0x63 ,0x6F ,0x6D ,0x2C ,0x68 ,0x6D ,0x61 ,0x63 
        ,0x2D ,0x73 ,0x68 ,0x61 ,0x31 ,0x2D ,0x65 ,0x74 ,0x6D ,0x40 ,0x6F ,0x70 ,0x65 ,0x6E ,0x73 
        ,0x73 ,0x68 ,0x2E ,0x63 ,0x6F ,0x6D ,0x2C ,0x75 ,0x6D ,0x61 ,0x63 ,0x2D ,0x36 ,0x34 ,0x40 
        ,0x6F ,0x70 ,0x65 ,0x6E ,0x73 ,0x73 ,0x68 ,0x2E ,0x63 ,0x6F ,0x6D ,0x2C ,0x75 ,0x6D ,0x61 
        ,0x63 ,0x2D ,0x31 ,0x32 ,0x38 ,0x40 ,0x6F ,0x70 ,0x65 ,0x6E ,0x73 ,0x73 ,0x68 ,0x2E ,0x63 
        ,0x6F ,0x6D ,0x2C ,0x68 ,0x6D ,0x61 ,0x63 ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 ,0x2D ,0x32 ,0x35 
        ,0x36 ,0x2C ,0x68 ,0x6D ,0x61 ,0x63 ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 ,0x2D ,0x35 ,0x31 ,0x32
        ,0x2C ,0x68 ,0x6D ,0x61 ,0x63 ,0x2D ,0x73 ,0x68 ,0x61 ,0x31 ,0x00 ,0x00 ,0x00 ,0x1A ,0x6E 
        ,0x6F ,0x6E ,0x65 ,0x2C ,0x7A ,0x6C ,0x69 ,0x62 ,0x40 ,0x6F ,0x70 ,0x65 ,0x6E ,0x73 ,0x73 
        ,0x68 ,0x2E ,0x63 ,0x6F ,0x6D ,0x2C ,0x7A ,0x6C ,0x69 ,0x62 ,0x00 ,0x00 ,0x00 ,0x1A ,0x6E 
        ,0x6F ,0x6E ,0x65 ,0x2C ,0x7A ,0x6C ,0x69 ,0x62 ,0x40 ,0x6F ,0x70 ,0x65 ,0x6E ,0x73 ,0x73 
        ,0x68 ,0x2E ,0x63 ,0x6F ,0x6D ,0x2C ,0x7A ,0x6C ,0x69 ,0x62 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00];
        let mut hassh_string: Vec<u8> = vec!();
        let mut hassh: Vec<u8> = vec!();
        match ssh_parse_key_exchange(&client_key_exchange){
            Ok((_, key_exchange)) => { 
                key_exchange.generate_hassh(&mut hassh_string, &mut hassh, &true); 
            }
            Err(_) => { }
        }

        assert_eq!(hassh_string, "curve25519-sha256,curve25519-sha256@libssh.org,\
                                  ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,\
                                  diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,\
                                  diffie-hellman-group14-sha1,ext-info-c;chacha20-poly1305@openssh.com,aes128-ctr,\
                                  aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com;umac-64-etm@openssh.com,\
                                  umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,\
                                  hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,\
                                  hmac-sha2-256,hmac-sha2-512,hmac-sha1;none,zlib@openssh.com,zlib".as_bytes().to_vec());
        
        assert_eq!(hassh, "ec7378c1a92f5a8dde7e8b7a1ddf33d1".as_bytes().to_vec());
    }

    #[test]
    fn test_parse_hassh_server() {
        let server_key_exchange = [0x7d, 0x76, 0x4f, 0x78, 0x81, 0x9e, 0x10, 0xfa, 0x23, 0x72,
        0xb5, 0x15, 0x56, 0xba, 0xf9, 0x46, 0x00, 0x00, 0x01, 0x02, 0x63, 0x75, 0x72, 0x76, 0x65, 0x32,
        0x35, 0x35, 0x31, 0x39, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x35, 0x36, 0x2c, 0x63, 0x75, 0x72, 0x76,
        0x65, 0x32, 0x35, 0x35, 0x31, 0x39, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x35, 0x36, 0x40, 0x6c, 0x69,
        0x62, 0x73, 0x73, 0x68, 0x2e, 0x6f, 0x72, 0x67, 0x2c, 0x65, 0x63, 0x64, 0x68, 0x2d, 0x73, 0x68,
        0x61, 0x32, 0x2d, 0x6e, 0x69, 0x73, 0x74, 0x70, 0x32, 0x35, 0x36, 0x2c, 0x65, 0x63, 0x64, 0x68,
        0x2d, 0x73, 0x68, 0x61, 0x32, 0x2d, 0x6e, 0x69, 0x73, 0x74, 0x70, 0x33, 0x38, 0x34, 0x2c, 0x65,
        0x63, 0x64, 0x68, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x2d, 0x6e, 0x69, 0x73, 0x74, 0x70, 0x35, 0x32,
        0x31, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c, 0x6d, 0x61, 0x6e,
        0x2d, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x2d, 0x65, 0x78, 0x63, 0x68, 0x61, 0x6e, 0x67, 0x65, 0x2d,
        0x73, 0x68, 0x61, 0x32, 0x35, 0x36, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65,
        0x6c, 0x6c, 0x6d, 0x61, 0x6e, 0x2d, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x31, 0x36, 0x2d, 0x73, 0x68,
        0x61, 0x35, 0x31, 0x32, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c,
        0x6d, 0x61, 0x6e, 0x2d, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x31, 0x38, 0x2d, 0x73, 0x68, 0x61, 0x35,
        0x31, 0x32, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c, 0x6d, 0x61,
        0x6e, 0x2d, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x31, 0x34, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x35, 0x36,
        0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c, 0x6d, 0x61, 0x6e, 0x2d,
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        0x73, 0x68, 0x61, 0x31, 0x2d, 0x65, 0x74, 0x6d, 0x40, 0x6f, 0x70, 0x65, 0x6e, 0x73, 0x73, 0x68,
        0x2e, 0x63, 0x6f, 0x6d, 0x2c, 0x75, 0x6d, 0x61, 0x63, 0x2d, 0x36, 0x34, 0x40, 0x6f, 0x70, 0x65,
        0x6e, 0x73, 0x73, 0x68, 0x2e, 0x63, 0x6f, 0x6d, 0x2c, 0x75, 0x6d, 0x61, 0x63, 0x2d, 0x31, 0x32,
        0x38, 0x40, 0x6f, 0x70, 0x65, 0x6e, 0x73, 0x73, 0x68, 0x2e, 0x63, 0x6f, 0x6d, 0x2c, 0x68, 0x6d,
        0x61, 0x63, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x2d, 0x32, 0x35, 0x36, 0x2c, 0x68, 0x6d, 0x61, 0x63,
        0x2d, 0x73, 0x68, 0x61, 0x32, 0x2d, 0x35, 0x31, 0x32, 0x2c, 0x68, 0x6d, 0x61, 0x63, 0x2d, 0x73,
        0x68, 0x61, 0x31, 0x00, 0x00, 0x00, 0x15, 0x6e, 0x6f, 0x6e, 0x65, 0x2c, 0x7a, 0x6c, 0x69, 0x62,
        0x40, 0x6f, 0x70, 0x65, 0x6e, 0x73, 0x73, 0x68, 0x2e, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x00, 0x15,
        0x6e, 0x6f, 0x6e, 0x65, 0x2c, 0x7a, 0x6c, 0x69, 0x62, 0x40, 0x6f, 0x70, 0x65, 0x6e, 0x73, 0x73,
        0x68, 0x2e, 0x63, 0x6f, 0x6d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
        let mut hassh_server_string: Vec<u8> = vec!();
        let mut hassh_server: Vec<u8> = vec!();
        match ssh_parse_key_exchange(&server_key_exchange){
            Ok((_, key_exchange)) => { 
                key_exchange.generate_hassh(&mut hassh_server_string, &mut hassh_server, &true);
            }
            Err(_) => { }
        }
        assert_eq!(hassh_server, "b12d2871a1189eff20364cf5333619ee".as_bytes().to_vec());
    }
    
    #[test]
    fn test_parse_hassh_server_malicious() {
        let server_key_exchange = [0x7d, 0x76, 0x4f, 0x78, 0x81, 0x9e, 0x10, 0xfa, 0x23, 0x72,
        0xb5, 0x15, 0x56, 0xba, 0xf9, 0x46, 0x00, 0x00, 0x01, 0x02, 0x75, 0x72, 0x76, 0x65, 0x32,
        0x35, 0x35, 0x31, 0x39, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x35, 0x36, 0x2c, 0x63, 0x75, 0x72, 0x76,
        0x65, 0x32, 0x35, 0x35, 0x31, 0x39, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x35, 0x36, 0x40, 0x6c, 0x69,
        0x62, 0x73, 0x73, 0x68, 0x2e, 0x6f, 0x72, 0x67, 0x2c, 0x65, 0x63, 0x64, 0x68, 0x2d, 0x73, 0x68,
        0x61, 0x32, 0x2d, 0x6e, 0x69, 0x73, 0x74, 0x70, 0x32, 0x35, 0x36, 0x2c, 0x65, 0x63, 0x64, 0x68,
        0x2d, 0x73, 0x68, 0x61, 0x32, 0x2d, 0x6e, 0x69, 0x73, 0x74, 0x70, 0x33, 0x38, 0x34, 0x2c, 0x65,
        0x63, 0x64, 0x68, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x2d, 0x6e, 0x69, 0x73, 0x74, 0x70, 0x35, 0x32,
        0x31, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c, 0x6d, 0x61, 0x6e,
        0x2d, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x2d, 0x65, 0x78, 0x63, 0x68, 0x61, 0x6e, 0x67, 0x65, 0x2d,
        0x73, 0x68, 0x61, 0x32, 0x35, 0x36, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65,
        0x6c, 0x6c, 0x6d, 0x61, 0x6e, 0x2d, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x31, 0x36, 0x2d, 0x73, 0x68,
        0x61, 0x35, 0x31, 0x32, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c,
        0x6d, 0x61, 0x6e, 0x2d, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x31, 0x38, 0x2d, 0x73, 0x68, 0x61, 0x35,
        0x31, 0x32, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c, 0x6d, 0x61,
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        0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c, 0x6d, 0x61, 0x6e, 0x2d,
        0x67, 0x72, 0x6f, 0x75, 0x70, 0x31, 0x34, 0x2d, 0x73, 0x68, 0x61, 0x31, 0x00, 0x00, 0x00, 0x41,
        0x73, 0x73, 0x68, 0x2d, 0x72, 0x73, 0x61, 0x2c, 0x72, 0x73, 0x61, 0x2d, 0x73, 0x68, 0x61, 0x32,
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        if let Err(e) = ssh_parse_key_exchange(&server_key_exchange) {
            assert_eq!(e, nom::Err::Incomplete(nom::Needed::Size(16755)));
        }
        else {
            panic!("ssh_parse_key_exchange() parsed malicious key_exchange");
        }
}
}