hanzo-kbs 1.1.21

//! Attestation verification module

use async_trait::async_trait;
use serde::{Deserialize, Serialize};

use crate::error::{Result, SecurityError};
use crate::types::{AttestationType, PrivacyTier};

/// Result of attestation verification
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AttestationResult {
    pub verified: bool,
    pub max_tier: PrivacyTier,
    pub measurements: Vec<Measurement>,
    pub platform_info: PlatformInfo,
    pub expires_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Measurement {
    pub name: String,
    pub value: Vec<u8>,
    pub pcr_index: Option<u8>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PlatformInfo {
    pub platform_type: String,
    pub tcb_version: String,
    pub security_features: Vec<String>,
    pub vendor_info: serde_json::Value,
}

impl AttestationResult {
    pub fn supports_tier(&self, tier: PrivacyTier) -> bool {
        self.verified && self.max_tier >= tier
    }
}

/// Trait for verifying different attestation types
#[async_trait]
pub trait AttestationVerifier: Send + Sync {
    /// Verify an attestation and return the result
    async fn verify_attestation(&self, attestation: &AttestationType) -> Result<AttestationResult>;
    
    /// Check if a measurement is in the allowed list
    async fn is_measurement_allowed(&self, measurement: &[u8]) -> bool;
}

/// Mock attestation verifier for development
pub struct MockAttestationVerifier;

#[async_trait]
impl AttestationVerifier for MockAttestationVerifier {
    async fn verify_attestation(&self, attestation: &AttestationType) -> Result<AttestationResult> {
        match attestation {
            AttestationType::SevSnp { report, .. } => {
                // Mock SEV-SNP verification
                Ok(AttestationResult {
                    verified: !report.is_empty(),
                    max_tier: PrivacyTier::CpuTee,
                    measurements: vec![
                        Measurement {
                            name: "kernel".to_string(),
                            value: vec![0xAA; 32],
                            pcr_index: Some(0),
                        },
                    ],
                    platform_info: PlatformInfo {
                        platform_type: "AMD SEV-SNP".to_string(),
                        tcb_version: "1.0.0".to_string(),
                        security_features: vec!["SME".to_string(), "SEV".to_string()],
                        vendor_info: serde_json::json!({}),
                    },
                    expires_at: chrono::Utc::now() + chrono::Duration::hours(1),
                })
            }
            AttestationType::Tdx { quote, .. } => {
                // Mock TDX verification
                Ok(AttestationResult {
                    verified: !quote.is_empty(),
                    max_tier: PrivacyTier::CpuTee,
                    measurements: vec![],
                    platform_info: PlatformInfo {
                        platform_type: "Intel TDX".to_string(),
                        tcb_version: "1.0.0".to_string(),
                        security_features: vec!["TDX".to_string()],
                        vendor_info: serde_json::json!({}),
                    },
                    expires_at: chrono::Utc::now() + chrono::Duration::hours(1),
                })
            }
            AttestationType::H100Cc { gpu_attestation, cpu_attestation } => {
                // Verify CPU attestation first
                let cpu_result = self.verify_attestation(cpu_attestation).await?;
                if !cpu_result.verified {
                    return Err(SecurityError::InvalidAttestation(
                        "CPU attestation failed".to_string()
                    ));
                }
                
                // Mock GPU CC verification
                Ok(AttestationResult {
                    verified: !gpu_attestation.is_empty(),
                    max_tier: PrivacyTier::GpuCc,
                    measurements: cpu_result.measurements,
                    platform_info: PlatformInfo {
                        platform_type: "NVIDIA H100 CC".to_string(),
                        tcb_version: "2.0.0".to_string(),
                        security_features: vec!["GPU_CC".to_string(), "MIG".to_string()],
                        vendor_info: serde_json::json!({"gpu_model": "H100"}),
                    },
                    expires_at: chrono::Utc::now() + chrono::Duration::hours(1),
                })
            }
            AttestationType::BlackwellTeeIo { tee_io_report, mig_config } => {
                // Mock Blackwell TEE-I/O verification
                Ok(AttestationResult {
                    verified: !tee_io_report.is_empty(),
                    max_tier: PrivacyTier::GpuTeeIo,
                    measurements: vec![],
                    platform_info: PlatformInfo {
                        platform_type: "NVIDIA Blackwell TEE-I/O".to_string(),
                        tcb_version: "1.0.0".to_string(),
                        security_features: vec![
                            "TEE_IO".to_string(),
                            "SECURE_BOOT".to_string(),
                            if mig_config.is_some() { "MIG_ISOLATION" } else { "FULL_GPU" }.to_string(),
                        ],
                        vendor_info: serde_json::json!({
                            "gpu_model": "Blackwell",
                            "mig_enabled": mig_config.is_some()
                        }),
                    },
                    expires_at: chrono::Utc::now() + chrono::Duration::minutes(30),
                })
            }
            AttestationType::SimEid { eid, signature } => {
                // Mock SIM EID verification
                Ok(AttestationResult {
                    verified: !eid.is_empty() && !signature.is_empty(),
                    max_tier: PrivacyTier::AtRest,
                    measurements: vec![],
                    platform_info: PlatformInfo {
                        platform_type: "SIM Card".to_string(),
                        tcb_version: "1.0.0".to_string(),
                        security_features: vec!["EID".to_string(), "SECURE_ELEMENT".to_string()],
                        vendor_info: serde_json::json!({"eid": eid}),
                    },
                    expires_at: chrono::Utc::now() + chrono::Duration::hours(24),
                })
            }
        }
    }
    
    async fn is_measurement_allowed(&self, _measurement: &[u8]) -> bool {
        // Mock implementation - allow all measurements
        true
    }
}

/// Production attestation verifier that calls actual verification services
pub struct HanzoAttestationVerifier {
    config: AttestationConfig,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AttestationConfig {
    pub sev_snp_service_url: Option<String>,
    pub tdx_service_url: Option<String>,
    pub nvidia_cc_service_url: Option<String>,
    pub allowed_measurements: Vec<AllowedMeasurement>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AllowedMeasurement {
    pub name: String,
    pub platform: String,
    pub values: Vec<String>, // Hex-encoded
}

impl HanzoAttestationVerifier {
    pub fn new(config: AttestationConfig) -> Self {
        Self { config }
    }
}

#[async_trait]
impl AttestationVerifier for HanzoAttestationVerifier {
    async fn verify_attestation(&self, attestation: &AttestationType) -> Result<AttestationResult> {
        match attestation {
            AttestationType::SevSnp { report, vcek_cert, platform_cert_chain } => {
                // TODO: Implement actual SEV-SNP verification
                // This would call AMD's attestation service or use a local verifier
                todo!("Implement SEV-SNP verification")
            }
            AttestationType::Tdx { quote, collateral } => {
                // TODO: Implement actual TDX verification
                // This would use Intel's attestation libraries
                todo!("Implement TDX verification")
            }
            AttestationType::H100Cc { .. } => {
                // TODO: Implement NVIDIA H100 CC verification
                todo!("Implement H100 CC verification")
            }
            AttestationType::BlackwellTeeIo { .. } => {
                // TODO: Implement Blackwell TEE-I/O verification
                todo!("Implement Blackwell verification")
            }
            AttestationType::SimEid { .. } => {
                // TODO: Implement SIM EID verification
                todo!("Implement SIM verification")
            }
        }
    }
    
    async fn is_measurement_allowed(&self, measurement: &[u8]) -> bool {
        let hex_measurement = hex::encode(measurement);
        self.config.allowed_measurements.iter().any(|allowed| {
            allowed.values.contains(&hex_measurement)
        })
    }
}