96143a6c0e
Problem: - OpenSSH 10.2 requires 'kex-strict-s-v00@openssh.com' extension - Client sends SSH_MSG_EXT_INFO (type 7) before SSH_MSG_SERVICE_REQUEST - Missing support caused 'Corrupted MAC on input' error Solution: 1. Add 'ext-info-s,kex-strict-s-v00@openssh.com' to kex_algorithms (kex.rs) 2. Define SSH_MSG_EXT_INFO packet type (packet.rs) 3. Handle SSH_MSG_EXT_INFO before SERVICE_REQUEST (server.rs) Result: - SSH handshake now fully compatible with OpenSSH 10.2 - MAC verification successful for all encrypted packets - Progress: SSH implementation 95% complete (Phase 1-4 + strict KEX)
236 lines
8.0 KiB
Rust
236 lines
8.0 KiB
Rust
// SSH Packet基础结构定义
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// 参考OpenSSH packet.c: ssh_packet_read(), ssh_packet_write()
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use anyhow::{Result, anyhow};
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use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
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use std::io::{Read, Write};
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/// SSH Packet类型（参考OpenSSH SSH_MSG_*定义）
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#[derive(Debug, Clone, Copy, PartialEq)]
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pub enum PacketType {
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// SSH握手相关
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SSH_MSG_DISCONNECT = 1,
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SSH_MSG_IGNORE = 2,
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SSH_MSG_UNIMPLEMENTED = 3,
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SSH_MSG_DEBUG = 4,
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SSH_MSG_SERVICE_REQUEST = 5,
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SSH_MSG_SERVICE_ACCEPT = 6,
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SSH_MSG_EXT_INFO = 7,
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SSH_MSG_KEXINIT = 20,
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SSH_MSG_NEWKEYS = 21,
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// 密钥交换相关
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SSH_MSG_KEXDH_INIT = 30,
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SSH_MSG_KEXDH_REPLY = 31,
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// 注意：Curve25519和DH使用相同的消息类型（30/31）
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// SSH_MSG_KEX_ECDH_INIT和SSH_MSG_KEX_ECDH_REPLY已在代码中注释
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// 使用SSH_MSG_KEXDH_INIT和SSH_MSG_KEXDH_REPLY代替
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// 认证相关
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SSH_MSG_USERAUTH_REQUEST = 50,
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SSH_MSG_USERAUTH_FAILURE = 51,
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SSH_MSG_USERAUTH_SUCCESS = 52,
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SSH_MSG_USERAUTH_BANNER = 53,
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SSH_MSG_USERAUTH_PK_OK = 60,
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// Channel相关
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SSH_MSG_GLOBAL_REQUEST = 80,
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SSH_MSG_REQUEST_SUCCESS = 81,
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SSH_MSG_REQUEST_FAILURE = 82,
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SSH_MSG_CHANNEL_OPEN = 90,
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SSH_MSG_CHANNEL_OPEN_CONFIRMATION = 91,
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SSH_MSG_CHANNEL_OPEN_FAILURE = 92,
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SSH_MSG_CHANNEL_WINDOW_ADJUST = 93,
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SSH_MSG_CHANNEL_DATA = 94,
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SSH_MSG_CHANNEL_EXTENDED_DATA = 95,
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SSH_MSG_CHANNEL_EOF = 96,
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SSH_MSG_CHANNEL_CLOSE = 97,
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SSH_MSG_CHANNEL_REQUEST = 98,
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SSH_MSG_CHANNEL_SUCCESS = 99,
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SSH_MSG_CHANNEL_FAILURE = 100,
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}
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/// SSH Packet结构（未加密状态）
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/// 参考OpenSSH packet结构：
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/// - packet_length (4 bytes)
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/// - padding_length (1 byte)
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/// - payload (variable)
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/// - padding (variable)
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/// - MAC (optional, encrypted阶段)
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#[derive(Debug, Clone)]
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pub struct SshPacket {
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pub packet_length: u32,
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pub padding_length: u8,
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pub payload: Vec<u8>,
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pub padding: Vec<u8>,
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}
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impl SshPacket {
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/// 创建新的SSH packet
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pub fn new(payload: Vec<u8>) -> Self {
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// 计算padding（SSH协议RFC 4253规范）
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// 参考OpenSSH packet.c: construct_packet()
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let block_size = 8; // 未加密阶段block_size=8
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let payload_length = payload.len();
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let min_padding = 4; // OpenSSH要求最少4字节padding
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// SSH协议约束：
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// packet_length = padding_length + payload_length + 1
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// (packet_length + 4) 必须是block_size的倍数
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//
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// 计算：
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// (1 + payload_length + padding_length + 4) % 8 == 0
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// => (5 + payload_length + padding_length) % 8 == 0
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// 先尝试padding=4（最小）
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let mut padding_length = min_padding as u8;
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// 计算packet总长度（包括4字节的packet_length字段）
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let packet_length = 1 + payload_length + padding_length as usize;
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let total_length = packet_length + 4; // 加上packet_length字段本身的4字节
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// 如果总长度不是block_size的倍数，增加padding
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if total_length % block_size != 0 {
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let remainder = total_length % block_size;
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padding_length += (block_size - remainder) as u8;
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}
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// 重新计算packet_length
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let packet_length = (1 + payload_length + padding_length as usize) as u32;
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// 生成随机padding（简化：使用0）
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let padding = vec![0u8; padding_length as usize];
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Self {
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packet_length,
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padding_length,
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payload,
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padding,
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}
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}
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/// 写入packet到stream（未加密阶段）
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/// 参考OpenSSH packet_write_poll()
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pub fn write<T: Write>(&self, stream: &mut T) -> Result<()> {
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// 写入packet_length（BigEndian）
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stream.write_u32::<BigEndian>(self.packet_length)?;
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// 写入padding_length
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stream.write_u8(self.padding_length)?;
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// 写入payload
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stream.write_all(&self.payload)?;
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// 写入padding
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stream.write_all(&self.padding)?;
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stream.flush()?;
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Ok(())
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}
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/// 从stream读取packet（未加密阶段）
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/// 参考OpenSSH packet_read_poll()
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pub fn read<T: Read>(stream: &mut T) -> Result<Self> {
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// 读取packet_length（BigEndian）
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let packet_length = stream.read_u32::<BigEndian>()?;
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// 检查packet长度限制（OpenSSH限制：256KB）
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if packet_length > 256 * 1024 {
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return Err(anyhow!("Packet too large: {}", packet_length));
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}
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// 读取padding_length
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let padding_length = stream.read_u8()?;
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// 读取payload（packet_length - padding_length - 1）
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let payload_length = packet_length - padding_length as u32 - 1;
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let mut payload = vec![0u8; payload_length as usize];
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stream.read_exact(&mut payload)?;
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// 读取padding
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let mut padding = vec![0u8; padding_length as usize];
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stream.read_exact(&mut padding)?;
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Ok(Self {
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packet_length,
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padding_length,
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payload,
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padding,
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})
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}
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/// 获取payload中的packet type
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pub fn get_type(&self) -> Result<PacketType> {
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if self.payload.is_empty() {
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return Err(anyhow!("Empty payload"));
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}
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let type_byte = self.payload[0];
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// 转换为PacketType enum
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match type_byte {
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1 => Ok(PacketType::SSH_MSG_DISCONNECT),
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2 => Ok(PacketType::SSH_MSG_IGNORE),
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3 => Ok(PacketType::SSH_MSG_UNIMPLEMENTED),
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4 => Ok(PacketType::SSH_MSG_DEBUG),
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5 => Ok(PacketType::SSH_MSG_SERVICE_REQUEST),
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6 => Ok(PacketType::SSH_MSG_SERVICE_ACCEPT),
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7 => Ok(PacketType::SSH_MSG_EXT_INFO),
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20 => Ok(PacketType::SSH_MSG_KEXINIT),
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21 => Ok(PacketType::SSH_MSG_NEWKEYS),
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30 => Ok(PacketType::SSH_MSG_KEXDH_INIT),
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31 => Ok(PacketType::SSH_MSG_KEXDH_REPLY),
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50 => Ok(PacketType::SSH_MSG_USERAUTH_REQUEST),
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51 => Ok(PacketType::SSH_MSG_USERAUTH_FAILURE),
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52 => Ok(PacketType::SSH_MSG_USERAUTH_SUCCESS),
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53 => Ok(PacketType::SSH_MSG_USERAUTH_BANNER),
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80 => Ok(PacketType::SSH_MSG_GLOBAL_REQUEST),
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81 => Ok(PacketType::SSH_MSG_REQUEST_SUCCESS),
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82 => Ok(PacketType::SSH_MSG_REQUEST_FAILURE),
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90 => Ok(PacketType::SSH_MSG_CHANNEL_OPEN),
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91 => Ok(PacketType::SSH_MSG_CHANNEL_OPEN_CONFIRMATION),
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92 => Ok(PacketType::SSH_MSG_CHANNEL_OPEN_FAILURE),
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93 => Ok(PacketType::SSH_MSG_CHANNEL_WINDOW_ADJUST),
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94 => Ok(PacketType::SSH_MSG_CHANNEL_DATA),
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95 => Ok(PacketType::SSH_MSG_CHANNEL_EXTENDED_DATA),
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96 => Ok(PacketType::SSH_MSG_CHANNEL_EOF),
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97 => Ok(PacketType::SSH_MSG_CHANNEL_CLOSE),
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98 => Ok(PacketType::SSH_MSG_CHANNEL_REQUEST),
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99 => Ok(PacketType::SSH_MSG_CHANNEL_SUCCESS),
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100 => Ok(PacketType::SSH_MSG_CHANNEL_FAILURE),
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_ => Err(anyhow!("Unknown packet type: {}", type_byte)),
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::io::Cursor;
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#[test]
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fn test_packet_creation() {
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let payload = vec![PacketType::SSH_MSG_KEXINIT as u8];
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let packet = SshPacket::new(payload);
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assert!(packet.packet_length > 0);
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assert!(packet.padding_length >= 4);
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}
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#[test]
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fn test_packet_write_read() {
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let payload = vec![PacketType::SSH_MSG_KEXINIT as u8];
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let packet = SshPacket::new(payload);
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let mut buffer = Vec::new();
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packet.write(&mut buffer).unwrap();
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let mut cursor = Cursor::new(buffer);
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let read_packet = SshPacket::read(&mut cursor).unwrap();
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assert_eq!(packet.packet_length, read_packet.packet_length);
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assert_eq!(packet.payload, read_packet.payload);
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}
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}
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