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use std::io::{Read, Write};
use opcua_types::*;
use opcua_types::status_code::StatusCode;
use opcua_types::constants;
use opcua_crypto::{SecurityPolicy, X509, Thumbprint};
#[derive(Debug, Clone, PartialEq)]
pub enum SecurityHeader {
Asymmetric(AsymmetricSecurityHeader),
Symmetric(SymmetricSecurityHeader),
}
impl BinaryEncoder<SecurityHeader> for SecurityHeader {
fn byte_len(&self) -> usize {
match self {
SecurityHeader::Asymmetric(value) => { value.byte_len() }
SecurityHeader::Symmetric(value) => { value.byte_len() }
}
}
fn encode<S: Write>(&self, stream: &mut S) -> EncodingResult<usize> {
match self {
SecurityHeader::Asymmetric(value) => { value.encode(stream) }
SecurityHeader::Symmetric(value) => { value.encode(stream) }
}
}
fn decode<S: Read>(_: &mut S, _: &DecodingLimits) -> EncodingResult<Self> {
unimplemented!();
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct SymmetricSecurityHeader {
pub token_id: u32,
}
impl BinaryEncoder<SymmetricSecurityHeader> for SymmetricSecurityHeader {
fn byte_len(&self) -> usize {
4
}
fn encode<S: Write>(&self, stream: &mut S) -> EncodingResult<usize> {
Ok(self.token_id.encode(stream)?)
}
fn decode<S: Read>(stream: &mut S, decoding_limits: &DecodingLimits) -> EncodingResult<Self> {
let token_id = u32::decode(stream, decoding_limits)?;
Ok(SymmetricSecurityHeader {
token_id
})
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct AsymmetricSecurityHeader {
pub security_policy_uri: UAString,
pub sender_certificate: ByteString,
pub receiver_certificate_thumbprint: ByteString,
}
impl BinaryEncoder<AsymmetricSecurityHeader> for AsymmetricSecurityHeader {
fn byte_len(&self) -> usize {
let mut size = 0;
size += self.security_policy_uri.byte_len();
size += self.sender_certificate.byte_len();
size += self.receiver_certificate_thumbprint.byte_len();
size
}
fn encode<S: Write>(&self, stream: &mut S) -> EncodingResult<usize> {
let mut size = 0;
size += self.security_policy_uri.encode(stream)?;
size += self.sender_certificate.encode(stream)?;
size += self.receiver_certificate_thumbprint.encode(stream)?;
assert_eq!(size, self.byte_len());
Ok(size)
}
fn decode<S: Read>(stream: &mut S, decoding_limits: &DecodingLimits) -> EncodingResult<Self> {
let security_policy_uri = UAString::decode(stream, decoding_limits)?;
let sender_certificate = ByteString::decode(stream, decoding_limits)?;
let receiver_certificate_thumbprint = ByteString::decode(stream, decoding_limits)?;
if sender_certificate.value.is_some() && sender_certificate.value.as_ref().unwrap().len() >= constants::MAX_CERTIFICATE_LENGTH as usize {
error!("Sender certificate exceeds max certificate size");
Err(StatusCode::BadDecodingError)
} else {
let thumbprint_len = if receiver_certificate_thumbprint.value.is_some() { receiver_certificate_thumbprint.value.as_ref().unwrap().len() } else { 0 };
if thumbprint_len > 0 && thumbprint_len != Thumbprint::THUMBPRINT_SIZE {
error!("Receiver certificate thumbprint is not 20 bytes long, {} bytes", receiver_certificate_thumbprint.value.as_ref().unwrap().len());
Err(StatusCode::BadDecodingError)
} else {
Ok(AsymmetricSecurityHeader {
security_policy_uri,
sender_certificate,
receiver_certificate_thumbprint,
})
}
}
}
}
impl AsymmetricSecurityHeader {
pub fn none() -> AsymmetricSecurityHeader {
AsymmetricSecurityHeader {
security_policy_uri: UAString::from(SecurityPolicy::None.to_uri()),
sender_certificate: ByteString::null(),
receiver_certificate_thumbprint: ByteString::null(),
}
}
pub fn new(security_policy: SecurityPolicy, sender_certificate: &X509, receiver_certificate_thumbprint: ByteString) -> AsymmetricSecurityHeader {
AsymmetricSecurityHeader {
security_policy_uri: UAString::from(security_policy.to_uri()),
sender_certificate: sender_certificate.as_byte_string(),
receiver_certificate_thumbprint,
}
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct SequenceHeader {
pub sequence_number: u32,
pub request_id: u32,
}
impl BinaryEncoder<SequenceHeader> for SequenceHeader {
fn byte_len(&self) -> usize {
8
}
fn encode<S: Write>(&self, stream: &mut S) -> EncodingResult<usize> {
let mut size: usize = 0;
size += self.sequence_number.encode(stream)?;
size += self.request_id.encode(stream)?;
Ok(size)
}
fn decode<S: Read>(stream: &mut S, decoding_limits: &DecodingLimits) -> EncodingResult<Self> {
let sequence_number = u32::decode(stream, decoding_limits)?;
let request_id = u32::decode(stream, decoding_limits)?;
Ok(SequenceHeader {
sequence_number,
request_id,
})
}
}