1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167

use core::mcs;
use core::license;
use core::tpkt;
use model::error::{RdpResult, Error, RdpError, RdpErrorKind};
use model::data::{Message, Component, U16, U32, DynOption, MessageOption, Trame, DataType};
use std::io::{Write, Read};
use model::unicode::Unicode;

/// Security flag send as header flage in core ptotocol
/// https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/e13405c5-668b-4716-94b2-1c2654ca1ad4?redirectedfrom=MSDN
#[repr(u16)]
#[allow(dead_code)]
enum SecurityFlag {
    SecExchangePkt = 0x0001,
    SecTransportReq = 0x0002,
    RdpSecTransportRsp = 0x0004,
    SecEncrypt = 0x0008,
    SecResetSeqno = 0x0010,
    SecIgnoreSeqno = 0x0020,
    SecInfoPkt = 0x0040,
    SecLicensePkt = 0x0080,
    SecLicenseEncryptCs = 0x0200,
    SecRedirectionPkt = 0x0400,
    SecSecureChecksum = 0x0800,
    SecAutodetectReq = 0x1000,
    SecAutodetectRsp = 0x2000,
    SecHeartbeat = 0x4000,
    SecFlagshiValid = 0x8000
}

/// RDP option someone links to capabilities
/// https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/732394f5-e2b5-4ac5-8a0a-35345386b0d1?redirectedfrom=MSDN
#[allow(dead_code)]
enum InfoFlag {
    InfoMouse = 0x00000001,
    InfoDisablectrlaltdel = 0x00000002,
    InfoAutologon = 0x00000008,
    InfoUnicode = 0x00000010,
    InfoMaximizeshell = 0x00000020,
    InfoLogonnotify = 0x00000040,
    InfoCompression = 0x00000080,
    InfoEnablewindowskey = 0x00000100,
    InfoRemoteconsoleaudio = 0x00002000,
    InfoForceEncryptedCsPdu = 0x00004000,
    InfoRail = 0x00008000,
    InfoLogonerrors = 0x00010000,
    InfoMouseHasWheel = 0x00020000,
    InfoPasswordIsScPin = 0x00040000,
    InfoNoaudioplayback = 0x00080000,
    InfoUsingSavedCreds = 0x00100000,
    InfoAudiocapture = 0x00200000,
    InfoVideoDisable = 0x00400000,
    InfoCompressionTypeMask = 0x00001E00
}

#[allow(dead_code)]
enum AfInet {
    AfInet = 0x00002,
    AfInet6 = 0x0017
}

/// On RDP version > 5
/// Client have to send IP information
fn rdp_extended_infos() -> Component {
    component![
        "clientAddressFamily" => U16::LE(AfInet::AfInet as u16),
        "cbClientAddress" => DynOption::new(U16::LE(0), |x| MessageOption::Size("clientAddress".to_string(), x.inner() as usize + 2)),
        "clientAddress" => b"\x00\x00".to_vec(),
        "cbClientDir" => U16::LE(0),
        "clientDir" => b"\x00\x00".to_vec(),
        "clientTimeZone" => vec![0; 172],
        "clientSessionId" => U32::LE(0),
        "performanceFlags" => U32::LE(0)
    ]
}

/// When CSSP is not used
/// interactive logon used credentials
/// present in this payload
fn rdp_infos(is_extended_info: bool, domain: &String, username: &String, password: &String, auto_logon: bool) -> Component {
    let mut domain_format = domain.to_unicode();
    domain_format.push(0);
    domain_format.push(0);

    let mut username_format = username.to_unicode();
    username_format.push(0);
    username_format.push(0);

    let mut password_format = password.to_unicode();
    password_format.push(0);
    password_format.push(0);

    component![
        "codePage" => U32::LE(0),
        "flag" => U32::LE(
            InfoFlag::InfoMouse as u32 |
            InfoFlag::InfoUnicode as u32 |
            InfoFlag::InfoLogonnotify as u32 |
            InfoFlag::InfoLogonerrors as u32 |
            InfoFlag::InfoDisablectrlaltdel as u32 |
            InfoFlag::InfoEnablewindowskey as u32 |
            if auto_logon { InfoFlag::InfoAutologon as u32 } else { 0 }
        ),
        "cbDomain" => U16::LE((domain_format.len() - 2) as u16),
        "cbUserName" => U16::LE((username_format.len() - 2) as u16),
        "cbPassword" => U16::LE((password_format.len() - 2) as u16),
        "cbAlternateShell" => U16::LE(0),
        "cbWorkingDir" => U16::LE(0),
        "domain" => domain_format,
        "userName" => username_format,
        "password" => password_format,
        "alternateShell" => b"\x00\x00".to_vec(),
        "workingDir" => b"\x00\x00".to_vec(),
        "extendedInfos" => if is_extended_info { rdp_extended_infos() } else { component![] }
    ]
}

/// Details of the security header
fn security_header() -> Component {
    component![
        "securityFlag" => U16::LE(0),
        "securityFlagHi" => U16::LE(0)
    ]
}


/// Security layer need mcs layer and send all message through
/// the global channel
///
/// This function is called sec because old RDP security
/// was made here
///
/// # Example
/// ```rust, ignore
/// use rdp::core::sec;
/// let mut mcs = mcs::Client(...).unwrap();
/// sec::connect(&mut mcs).unwrap();
/// ```
pub fn connect<T: Read + Write>(mcs: &mut mcs::Client<T>, domain: &String, username: &String, password: &String, auto_logon: bool) -> RdpResult<()> {
    mcs.write(
        &"global".to_string(),
        trame![
            U16::LE(SecurityFlag::SecInfoPkt as u16),
            U16::LE(0),
            rdp_infos(
                mcs.is_rdp_version_5_plus(),
                domain,
                username,
                password,
                auto_logon
            )
        ]
    )?;

    let (_channel_name, payload) = mcs.read()?;
    let mut stream = try_let!(tpkt::Payload::Raw, payload)?;
    let mut header = security_header();
    header.read(&mut stream)?;
    if cast!(DataType::U16, header["securityFlag"])? & SecurityFlag::SecLicensePkt as u16 == 0 {
        return Err(Error::RdpError(RdpError::new(RdpErrorKind::InvalidData, "SEC: Invalid Licence packet")));
    }

    license::client_connect(&mut stream)?;
    Ok(())
}