rust/ssh: add hassh generation

Add generation of hassh fingerprints based on fields in the kexinit record

rust/Cargo.toml.in

@@ -28,6 +28,7 @@ num = "0.2"
 num-derive = "0.2"
 num-traits = "0.2"
 widestring = "0.4"
+md5 = "0.7.0"
 
 der-parser = "3.0"
 kerberos-parser = "0.4"

rust/src/ssh/detect.rs

@@ -90,3 +90,81 @@ pub extern "C" fn rs_ssh_tx_get_software(
 
     return 0;
 }
+
+#[no_mangle]
+pub extern "C" fn rs_ssh_tx_get_hassh(
+    tx: *mut std::os::raw::c_void,
+    buffer: *mut *const u8,
+    buffer_len: *mut u32,
+    direction: u8,
+) -> u8 {
+    let tx = cast_pointer!(tx, SSHTransaction);
+    match direction {
+        STREAM_TOSERVER => {
+            let m = &tx.cli_hdr.hassh;
+            if m.len() > 0 {
+                unsafe {
+                    *buffer = m.as_ptr();
+                    *buffer_len = m.len() as u32;
+                }
+                return 1;
+            }
+        }
+        STREAM_TOCLIENT => {
+            let m = &tx.srv_hdr.hassh;
+            if m.len() > 0 {
+                unsafe {
+                    *buffer = m.as_ptr();
+                    *buffer_len = m.len() as u32;
+                }
+                return 1;
+            }
+        }
+        _ => {}
+    }
+    unsafe {
+        *buffer = ptr::null();
+        *buffer_len = 0;
+    }
+
+    return 0;
+}
+
+#[no_mangle]
+pub extern "C" fn rs_ssh_tx_get_hassh_string(
+    tx: *mut std::os::raw::c_void,
+    buffer: *mut *const u8,
+    buffer_len: *mut u32,
+    direction: u8,
+) -> u8 {
+    let tx = cast_pointer!(tx, SSHTransaction);
+    match direction {
+        STREAM_TOSERVER => {
+            let m = &tx.cli_hdr.hassh_string;
+            if m.len() > 0 {
+                unsafe {
+                    *buffer = m.as_ptr();
+                    *buffer_len = m.len() as u32;
+                }
+                return 1;
+            }
+        }
+        STREAM_TOCLIENT => {
+            let m = &tx.srv_hdr.hassh_string;
+            if m.len() > 0 {
+                unsafe {
+                    *buffer = m.as_ptr();
+                    *buffer_len = m.len() as u32;
+                }
+                return 1;
+            }
+        }
+        _ => {}
+    }
+    unsafe {
+        *buffer = ptr::null();
+        *buffer_len = 0;
+    }
+
+    return 0;
+}

rust/src/ssh/parser.rs

@@ -19,6 +19,40 @@ use nom::combinator::rest;
 use nom::number::streaming::{be_u32, be_u8};
 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 {
@@ -63,14 +97,14 @@ named!(pub ssh_parse_banner<SshBanner>,
 pub struct SshRecordHeader {
     pub pkt_len: u32,
     padding_len: u8,
-    pub msg_code: 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:{})",
+            "(pkt_len:{}, padding_len:{}, msg_code:{:?})",
             self.pkt_len, self.padding_len, self.msg_code
         )
     }
@@ -81,7 +115,9 @@ named!(pub ssh_parse_record_header<SshRecordHeader>,
         pkt_len: verify!(be_u32, |&val| val > 1) >>
         padding_len: be_u8 >>
         msg_code: be_u8 >>
-        (SshRecordHeader{pkt_len, padding_len, msg_code})
+        (SshRecordHeader{pkt_len: pkt_len,
+            padding_len: padding_len,
+            msg_code: MessageCode::from_u8(msg_code)})
     )
 );
 
@@ -92,10 +128,91 @@ named!(pub ssh_parse_record<SshRecordHeader>,
         padding_len: be_u8 >>
         msg_code: be_u8 >>
         take!((pkt_len-2) as usize) >>
-        (SshRecordHeader{pkt_len, padding_len, msg_code})
+        (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,
+}
+
+use md5::compute;
+
+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?}", compute(&hassh_string)).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 {
 
@@ -192,5 +309,396 @@ mod tests {
             }
         }
     }
+    #[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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+        ,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 
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+        ,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 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 
+        ,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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+        ,0x36 ,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 ,0x2C 
+        ,0x65 ,0x78 ,0x74 ,0x2D ,0x69 ,0x6E ,0x66 ,0x6F ,0x2D ,0x63 ,0x00 ,0x00 ,0x01 ,0x66 ,0x65 
+        ,0x63 ,0x64 ,0x73 ,0x61 ,0x2D ,0x73 ,0x68 ,0x61 ,0x32 ,0x2D ,0x6E ,0x69 ,0x73 ,0x74 ,0x70 
+        ,0x32 ,0x35 ,0x36 ,0x2D ,0x63 ,0x65 ,0x72 ,0x74 ,0x2D ,0x76 ,0x30 ,0x31 ,0x40 ,0x6F ,0x70 
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+        ,0x32 ,0x2D ,0x6E ,0x69 ,0x73 ,0x74 ,0x70 ,0x35 ,0x32 ,0x31 ,0x2D ,0x63 ,0x65 ,0x72 ,0x74 
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+        ,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,
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+        0x61, 0x35, 0x31, 0x32, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65, 0x6c, 0x6c,
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+        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,
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+        0x36, 0x2c, 0x65, 0x63, 0x64, 0x73, 0x61, 0x2d, 0x73, 0x68, 0x61, 0x32, 0x2d, 0x6e, 0x69, 0x73,
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+        0x63, 0x74, 0x72, 0x2c, 0x61, 0x65, 0x73, 0x31, 0x32, 0x38, 0x2d, 0x67, 0x63, 0x6d, 0x40, 0x6f,
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+        0x36, 0x2d, 0x67, 0x63, 0x6d, 0x40, 0x6f, 0x70, 0x65, 0x6e, 0x73, 0x73, 0x68, 0x2e, 0x63, 0x6f,
+        0x6d, 0x00, 0x00, 0x00, 0xd5, 0x75, 0x6d, 0x61, 0x63, 0x2d, 0x36, 0x34, 0x2d, 0x65, 0x74, 0x6d,
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+        0x63, 0x2d, 0x31, 0x32, 0x38, 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, 0x32, 0x2d,
+        0x32, 0x35, 0x36, 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, 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,
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+        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, 0xd5, 0x75, 0x6d,
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+        0x68, 0x2e, 0x63, 0x6f, 0x6d, 0x2c, 0x75, 0x6d, 0x61, 0x63, 0x2d, 0x31, 0x32, 0x38, 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, 0x32, 0x2d, 0x32, 0x35, 0x36, 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, 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, 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];
+
+        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");
+        }
+}
 }

rust/src/ssh/ssh.rs

@@ -22,14 +22,21 @@ use crate::core::{self, AppProto, Flow, ALPROTO_UNKNOWN, IPPROTO_TCP};
 use crate::log::*;
 use std::ffi::{CStr, CString};
 use std::mem::transmute;
+use std::sync::atomic::{AtomicBool, Ordering};
 
 static mut ALPROTO_SSH: AppProto = ALPROTO_UNKNOWN;
+static HASSH_ENABLED: AtomicBool = AtomicBool::new(false);
+
+fn hassh_is_enabled() -> bool {
+    HASSH_ENABLED.load(Ordering::Relaxed)
+}
 
 #[repr(u32)]
 pub enum SSHEvent {
     InvalidBanner = 0,
     LongBanner,
     InvalidRecord,
+    LongKexRecord,
 }
 
 impl SSHEvent {
@@ -38,6 +45,7 @@ impl SSHEvent {
             0 => Some(SSHEvent::InvalidBanner),
             1 => Some(SSHEvent::LongBanner),
             2 => Some(SSHEvent::InvalidRecord),
+            3 => Some(SSHEvent::LongKexRecord),
             _ => None,
         }
     }
@@ -54,23 +62,33 @@ pub enum SSHConnectionState {
 
 const SSH_MAX_BANNER_LEN: usize = 256;
 const SSH_RECORD_HEADER_LEN: usize = 6;
-//TODO complete enum and parse messages contents
-const SSH_MSG_NEWKEYS: u8 = 21;
+const SSH_RECORD_PADDING_LEN: usize = 4;
+const SSH_MAX_REASSEMBLED_RECORD_LEN: usize = 65535;
 
 pub struct SshHeader {
     record_left: u32,
+    record_left_msg: parser::MessageCode,
+
     flags: SSHConnectionState,
     pub protover: Vec<u8>,
     pub swver: Vec<u8>,
+
+    pub hassh: Vec<u8>,
+    pub hassh_string: Vec<u8>,
 }
 
 impl SshHeader {
     pub fn new() -> SshHeader {
         SshHeader {
             record_left: 0,
+            record_left_msg: parser::MessageCode::SshMsgUndefined(0),
+
             flags: SSHConnectionState::SshStateInProgress,
             protover: Vec::new(),
             swver: Vec::new(),
+
+            hassh: Vec::new(),
+            hassh_string: Vec::new(),
         }
     }
 }
@@ -146,8 +164,20 @@ impl SSHState {
                 hdr.record_left -= ilen;
                 return AppLayerResult::ok();
             } else {
-                let start = hdr.record_left as usize;
-                input = &input[start..];
+                match hdr.record_left_msg {
+                    // parse reassembled tcp segments
+                    parser::MessageCode::SshMsgKexinit if hassh_is_enabled() => {
+                        if let Ok((rem, key_exchange)) = parser::ssh_parse_key_exchange(&input) {
+                            key_exchange.generate_hassh(&mut hdr.hassh_string, &mut hdr.hassh, &resp);
+                            input = &rem[SSH_RECORD_PADDING_LEN..];
+                        }
+                        hdr.record_left_msg = parser::MessageCode::SshMsgUndefined(0);
+                    }
+                    _ => {
+                        let start = hdr.record_left as usize;
+                        input = &input[start..];
+                    }
+                }
                 hdr.record_left = 0;
             }
         }
@@ -156,20 +186,29 @@ impl SSHState {
             match parser::ssh_parse_record(input) {
                 Ok((rem, head)) => {
                     SCLogDebug!("SSH valid record {}", head);
-                    input = rem;
-                    if head.msg_code == SSH_MSG_NEWKEYS {
-                        hdr.flags = SSHConnectionState::SshStateFinished;
-                        if ohdr.flags >= SSHConnectionState::SshStateFinished {
-                            unsafe {
-                                AppLayerParserStateSetFlag(
-                                    pstate,
-                                    APP_LAYER_PARSER_NO_INSPECTION
+                    match head.msg_code {
+                        parser::MessageCode::SshMsgKexinit if hassh_is_enabled() => {
+                        	if let Ok((_, key_exchange)) = parser::ssh_parse_key_exchange(&input[SSH_RECORD_HEADER_LEN..]) {
+                                key_exchange.generate_hassh(&mut hdr.hassh_string, &mut hdr.hassh, &resp);
+                            }
+                        }
+                        parser::MessageCode::SshMsgNewKeys => {
+                            hdr.flags = SSHConnectionState::SshStateFinished;
+                            if ohdr.flags >= SSHConnectionState::SshStateFinished {
+                                unsafe {
+                                    AppLayerParserStateSetFlag(
+                                        pstate,
+                                        APP_LAYER_PARSER_NO_INSPECTION
                                         | APP_LAYER_PARSER_NO_REASSEMBLY
                                         | APP_LAYER_PARSER_BYPASS_READY,
-                                );
+                                    );
+                                }
                             }
                         }
+                        _ => {}
                     }
+                    
+                    input = rem;
                     //header and complete data (not returned)
                 }
                 Err(nom::Err::Incomplete(_)) => {
@@ -179,8 +218,26 @@ impl SSHState {
                             let remlen = rem.len() as u32;
                             hdr.record_left = head.pkt_len - 2 - remlen;
                             //header with rem as incomplete data
-                            if head.msg_code == SSH_MSG_NEWKEYS {
-                                hdr.flags = SSHConnectionState::SshStateFinished;
+                            match head.msg_code { 
+                                parser::MessageCode::SshMsgNewKeys => {
+                                    hdr.flags = SSHConnectionState::SshStateFinished;
+                                }
+                                parser::MessageCode::SshMsgKexinit if hassh_is_enabled() => {
+                                    // check if buffer is bigger than maximum reassembled packet size
+                                    if hdr.record_left < SSH_MAX_REASSEMBLED_RECORD_LEN as u32 {
+                                        // saving type of incomplete kex message
+                                        hdr.record_left_msg = parser::MessageCode::SshMsgKexinit;
+                                        return AppLayerResult::incomplete(
+                                            SSH_RECORD_HEADER_LEN as u32,
+                                            hdr.record_left as u32
+                                        );
+                                    }
+                                    else {
+                                        SCLogDebug!("SSH buffer is bigger than maximum reassembled packet size");
+                                        self.set_event(SSHEvent::LongKexRecord);
+                                    }
+                                }
+                                _ => {}
                             }
                             return AppLayerResult::ok();
                         }
@@ -333,6 +390,7 @@ pub extern "C" fn rs_ssh_state_get_event_info(
                 "invalid_banner" => SSHEvent::InvalidBanner as i32,
                 "long_banner" => SSHEvent::LongBanner as i32,
                 "invalid_record" => SSHEvent::InvalidRecord as i32,
+                "long_kex_record" => SSHEvent::LongKexRecord as i32,
                 _ => -1, // unknown event
             }
         }
@@ -355,6 +413,7 @@ pub extern "C" fn rs_ssh_state_get_event_info_by_id(
             SSHEvent::InvalidBanner => "invalid_banner\0",
             SSHEvent::LongBanner => "long_banner\0",
             SSHEvent::InvalidRecord => "invalid_record\0",
+            SSHEvent::LongKexRecord => "long_kex_record\0",
         };
         unsafe {
             *event_name = estr.as_ptr() as *const std::os::raw::c_char;
@@ -537,3 +596,13 @@ pub unsafe extern "C" fn rs_ssh_register_parser() {
         SCLogNotice!("Protocol detector and parser disabled for SSH.");
     }
 }
+
+#[no_mangle]
+pub extern "C" fn rs_ssh_enable_hassh() {
+    HASSH_ENABLED.store(true, Ordering::Relaxed)
+}
+
+#[no_mangle]
+pub extern "C" fn rs_ssh_hassh_is_enabled() -> bool {
+    hassh_is_enabled()
+}

src/app-layer-ssh.c

@@ -53,6 +53,8 @@
 #include "util-byte.h"
 #include "util-memcmp.h"
 
+/* HASSH fingerprints are disabled by default */
+#define SSH_CONFIG_DEFAULT_HASSH FALSE
 
 static int SSHRegisterPatternsForProtocolDetection(void)
 {
@@ -79,6 +81,23 @@ void RegisterSSHParsers(void)
         AppLayerProtoDetectRegisterProtocol(ALPROTO_SSH, proto_name);
         if (SSHRegisterPatternsForProtocolDetection() < 0)
             return;
+
+        /* Check if we should generate Hassh fingerprints */
+        int enable_hassh = SSH_CONFIG_DEFAULT_HASSH;
+        const char *strval = NULL;
+        if (ConfGetValue("app-layer.protocols.ssh.hassh", &strval) != 1) {
+            enable_hassh = SSH_CONFIG_DEFAULT_HASSH;
+        } else if (strcmp(strval, "auto") == 0) {
+            enable_hassh = SSH_CONFIG_DEFAULT_HASSH;
+        } else if (ConfValIsFalse(strval)) {
+            enable_hassh = SSH_CONFIG_DEFAULT_HASSH;
+        } else if (ConfValIsTrue(strval)) {
+            enable_hassh = true;
+        }
+
+        if (RunmodeIsUnittests() || enable_hassh) {
+            rs_ssh_enable_hassh();
+        }
     }
 
     SCLogDebug("Registering Rust SSH parser.");