rvoip-rtp-core 0.2.3

RTP/RTCP protocol implementation for the rvoip stack
Documentation 
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//! Fingerprint generation and verification
//!
//! This module provides functions for generating and verifying fingerprints.

use std::sync::Arc;
use tokio::sync::Mutex;
use tracing::{debug, warn};

use crate::api::common::error::SecurityError;
use crate::dtls::DtlsConnection;

/// Generate a fingerprint from a DTLS connection
pub async fn generate_fingerprint(
    connection: &Arc<Mutex<Option<DtlsConnection>>>,
) -> Result<String, SecurityError> {
    let conn_guard = connection.lock().await;

    if let Some(conn) = conn_guard.as_ref() {
        // Get the certificate from the connection
        if let Some(cert) = conn.local_certificate() {
            // Create a mutable copy of the certificate to compute fingerprint
            let mut cert_copy = cert.clone();
            match cert_copy.fingerprint("SHA-256") {
                Ok(fingerprint) => Ok(fingerprint),
                Err(e) => Err(SecurityError::Internal(format!(
                    "Failed to get fingerprint: {}",
                    e
                ))),
            }
        } else {
            Err(SecurityError::Configuration(
                "No certificate available".to_string(),
            ))
        }
    } else {
        Err(SecurityError::NotInitialized(
            "DTLS connection not initialized".to_string(),
        ))
    }
}

/// Verify a remote fingerprint
pub async fn verify_fingerprint(
    connection: &Arc<Mutex<Option<DtlsConnection>>>,
    remote_fingerprint: &str,
    remote_fingerprint_algorithm: &str,
) -> Result<bool, SecurityError> {
    let conn_guard = connection.lock().await;

    if let Some(conn) = conn_guard.as_ref() {
        // Get the remote certificate from the connection
        if let Some(cert) = conn.remote_certificate() {
            // Create a mutable copy of the certificate to compute fingerprint
            let mut cert_copy = cert.clone();

            // Determine the algorithm to use based on the provided algorithm string
            let algorithm = match remote_fingerprint_algorithm.to_lowercase().as_str() {
                "sha-1" => "SHA-1",
                "sha-256" => "SHA-256",
                "sha-384" => "SHA-384",
                "sha-512" => "SHA-512",
                _ => {
                    return Err(SecurityError::HandshakeVerification(format!(
                        "Unsupported fingerprint algorithm: {}",
                        remote_fingerprint_algorithm
                    )));
                }
            };

            // Generate the fingerprint using the specified algorithm
            match cert_copy.fingerprint(algorithm) {
                Ok(actual_fingerprint) => {
                    // Normalize both fingerprints for comparison (remove colons, convert to lowercase)
                    let expected = remote_fingerprint.replace(":", "").to_lowercase();
                    let actual = actual_fingerprint.replace(":", "").to_lowercase();

                    // Compare the fingerprints
                    let matches = expected == actual;

                    if matches {
                        debug!("Fingerprint verification successful");
                    } else {
                        warn!(
                            "Fingerprint verification failed! Expected: {}, Actual: {}",
                            remote_fingerprint, actual_fingerprint
                        );
                    }

                    Ok(matches)
                }
                Err(e) => Err(SecurityError::HandshakeVerification(format!(
                    "Failed to generate fingerprint for verification: {}",
                    e
                ))),
            }
        } else {
            Err(SecurityError::HandshakeVerification(
                "No remote certificate available for verification".to_string(),
            ))
        }
    } else {
        Err(SecurityError::NotInitialized(
            "DTLS connection not initialized".to_string(),
        ))
    }
}

/// Get the fingerprint algorithm used
pub fn get_fingerprint_algorithm() -> String {
    // We use SHA-256 as the default fingerprint algorithm
    "sha-256".to_string()
}