Cross-Platform Security Service Architecture in Rust#

1
[package]
2
name = "security-service"
3
version = "1.0.0"
4
edition = "2021"
5

6
[dependencies]
7
# Async runtime
8
tokio = { version = "1.35", features = ["full"] }
9
tokio-util = { version = "0.7", features = ["codec"] }
10

11
# Cross-platform service management
12
async-trait = "0.1"
13

14
# Platform-specific dependencies
15
[target.'cfg(windows)'.dependencies]
16
windows-service = "0.6"
17
windows = { version = "0.52", features = [
18
    "Win32_Foundation",
19
    "Win32_Security",
20
    "Win32_System_Services",
21
] }
22

23
[target.'cfg(target_os = "linux")'.dependencies]
24
sd-notify = "0.4"
25
nix = { version = "0.27", features = ["user", "signal"] }
26

27
[target.'cfg(target_os = "macos")'.dependencies]
28
launchd = "0.2"
29
nix = { version = "0.27", features = ["user", "signal"] }
30

31
# Common dependencies
32
serde = { version = "1.0", features = ["derive"] }
33
serde_json = "1.0"
34
config = "0.13"
35
tracing = "0.1"
36
tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
37
tracing-appender = "0.2"
38
anyhow = "1.0"
39
thiserror = "1.0"
40
clap = { version = "4.4", features = ["derive"] }
41
uuid = { version = "1.6", features = ["v4", "serde"] }
42
chrono = { version = "0.4", features = ["serde"] }
43
prometheus = { version = "0.13", features = ["process"] }
44
reqwest = { version = "0.11", features = ["json", "rustls-tls"] }
45
sqlx = { version = "0.7", features = ["runtime-tokio-rustls", "sqlite"] }
46

47
# Security dependencies
48
ring = "0.17"
49
rustls = "0.22"
50
password-hash = "0.5"
51
argon2 = "0.5"
52

53
[dev-dependencies]
54
tempfile = "3.8"
55
mockall = "0.12"
56
proptest = "1.4"
57
criterion = "0.5"
58

59
[[bin]]
60
name = "security-service"
61
path = "src/main.rs"

1
use async_trait::async_trait;
2
use std::future::Future;
3
use std::pin::Pin;
4
use anyhow::Result;
5

6
#[async_trait]
7
pub trait ServiceController: Send + Sync {
8
    /// Initialize the service
9
    async fn initialize(&mut self) -> Result<()>;
10

11
    /// Start the service
12
    async fn start(&mut self) -> Result<()>;
13

14
    /// Stop the service gracefully
15
    async fn stop(&mut self) -> Result<()>;
16

17
    /// Handle platform-specific control events
18
    async fn handle_control_event(&mut self, event: ControlEvent) -> Result<()>;
19

20
    /// Get service status
21
    fn status(&self) -> ServiceStatus;
22
}
23

24
#[derive(Debug, Clone)]
25
pub enum ControlEvent {
26
    Stop,
27
    Pause,
28
    Continue,
29
    Reload,
30
    Custom(String),
31
}
32

33
#[derive(Debug, Clone, PartialEq)]
34
pub enum ServiceStatus {
35
    Stopped,
36
    Starting,
37
    Running,
38
    Stopping,
39
    Paused,
40
    Error(String),
41
}
42

43
/// Platform-specific service implementation
44
#[cfg(target_os = "linux")]
45
pub type PlatformService = linux::LinuxService;
46

47
#[cfg(target_os = "windows")]
48
pub type PlatformService = windows::WindowsService;
49

50
#[cfg(target_os = "macos")]
51
pub type PlatformService = macos::MacOSService;

1
use super::*;
2
use crate::config::Config;
3
use crate::security::SecurityEngine;
4
use crate::monitoring::MonitoringEngine;
5
use tokio::sync::{broadcast, RwLock};
6
use std::sync::Arc;
7
use tracing::{info, error, debug};
8

9
pub struct SecurityService {
10
    config: Arc<RwLock<Config>>,
11
    security_engine: Arc<SecurityEngine>,
12
    monitoring_engine: Arc<MonitoringEngine>,
13
    status: Arc<RwLock<ServiceStatus>>,
14
    shutdown_tx: broadcast::Sender<()>,
15
    tasks: Vec<tokio::task::JoinHandle<()>>,
16
}
17

18
impl SecurityService {
19
    pub fn new(config: Config) -> Result<Self> {
20
        let (shutdown_tx, _) = broadcast::channel(16);
21

22
        Ok(Self {
23
            config: Arc::new(RwLock::new(config)),
24
            security_engine: Arc::new(SecurityEngine::new()?),
25
            monitoring_engine: Arc::new(MonitoringEngine::new()?),
26
            status: Arc::new(RwLock::new(ServiceStatus::Stopped)),
27
            shutdown_tx,
28
            tasks: Vec::new(),
29
        })
30
    }
31

32
    async fn update_status(&self, status: ServiceStatus) {
33
        let mut current = self.status.write().await;
34
        *current = status;
35
    }
36

37
    async fn spawn_monitoring_task(&mut self) -> Result<()> {
38
        let engine = Arc::clone(&self.monitoring_engine);
39
        let mut shutdown_rx = self.shutdown_tx.subscribe();
40
        let config = Arc::clone(&self.config);
41

42
        let task = tokio::spawn(async move {
43
            let mut interval = tokio::time::interval(
44
                tokio::time::Duration::from_secs(10)
45
            );
46

47
            loop {
48
                tokio::select! {
49
                    _ = interval.tick() => {
50
                        if let Err(e) = engine.collect_metrics(&config).await {
51
                            error!("Monitoring error: {}", e);
52
                        }
53
                    }
54
                    _ = shutdown_rx.recv() => {
55
                        info!("Monitoring task shutting down");
56
                        break;
57
                    }
58
                }
59
            }
60
        });
61

62
        self.tasks.push(task);
63
        Ok(())
64
    }
65

66
    async fn spawn_security_task(&mut self) -> Result<()> {
67
        let engine = Arc::clone(&self.security_engine);
68
        let mut shutdown_rx = self.shutdown_tx.subscribe();
69

70
        let task = tokio::spawn(async move {
71
            let mut interval = tokio::time::interval(
72
                tokio::time::Duration::from_secs(5)
73
            );
74

75
            loop {
76
                tokio::select! {
77
                    _ = interval.tick() => {
78
                        if let Err(e) = engine.check_threats().await {
79
                            error!("Security check error: {}", e);
80
                        }
81
                    }
82
                    _ = shutdown_rx.recv() => {
83
                        info!("Security task shutting down");
84
                        break;
85
                    }
86
                }
87
            }
88
        });
89

90
        self.tasks.push(task);
91
        Ok(())
92
    }
93
}
94

95
#[async_trait]
96
impl ServiceController for SecurityService {
97
    async fn initialize(&mut self) -> Result<()> {
98
        info!("Initializing security service");
99
        self.update_status(ServiceStatus::Starting).await;
100

101
        // Load configuration
102
        let config = self.config.read().await;
103

104
        // Initialize security engine
105
        self.security_engine.initialize(&config).await?;
106

107
        // Initialize monitoring engine
108
        self.monitoring_engine.initialize(&config).await?;
109

110
        // Drop privileges if running as root
111
        #[cfg(unix)]
112
        if nix::unistd::geteuid().is_root() {
113
            drop_privileges(&config)?;
114
        }
115

116
        info!("Security service initialized");
117
        Ok(())
118
    }
119

120
    async fn start(&mut self) -> Result<()> {
121
        info!("Starting security service");
122

123
        // Spawn background tasks
124
        self.spawn_monitoring_task().await?;
125
        self.spawn_security_task().await?;
126

127
        // Start API server
128
        let api_task = crate::api::start_server(
129
            Arc::clone(&self.config),
130
            self.shutdown_tx.subscribe(),
131
        ).await?;
132
        self.tasks.push(api_task);
133

134
        self.update_status(ServiceStatus::Running).await;
135
        info!("Security service started successfully");
136

137
        Ok(())
138
    }
139

140
    async fn stop(&mut self) -> Result<()> {
141
        info!("Stopping security service");
142
        self.update_status(ServiceStatus::Stopping).await;
143

144
        // Send shutdown signal
145
        let _ = self.shutdown_tx.send(());
146

147
        // Wait for all tasks to complete
148
        for task in self.tasks.drain(..) {
149
            if let Err(e) = task.await {
150
                error!("Task join error: {}", e);
151
            }
152
        }
153

154
        // Cleanup
155
        self.security_engine.shutdown().await?;
156
        self.monitoring_engine.shutdown().await?;
157

158
        self.update_status(ServiceStatus::Stopped).await;
159
        info!("Security service stopped");
160

161
        Ok(())
162
    }
163

164
    async fn handle_control_event(&mut self, event: ControlEvent) -> Result<()> {
165
        match event {
166
            ControlEvent::Stop => self.stop().await,
167
            ControlEvent::Reload => {
168
                info!("Reloading configuration");
169
                let new_config = Config::load().await?;
170
                let mut config = self.config.write().await;
171
                *config = new_config;
172
                Ok(())
173
            }
174
            ControlEvent::Custom(cmd) => {
175
                debug!("Received custom command: {}", cmd);
176
                Ok(())
177
            }
178
            _ => Ok(()),
179
        }
180
    }
181

182
    fn status(&self) -> ServiceStatus {
183
        futures::executor::block_on(async {
184
            self.status.read().await.clone()
185
        })
186
    }
187
}
188

189
#[cfg(unix)]
190
fn drop_privileges(config: &Config) -> Result<()> {
191
    use nix::unistd::{setuid, setgid, Uid, Gid};
192

193
    // Get configured user/group
194
    let username = config.service.run_as_user.as_ref()
195
        .ok_or_else(|| anyhow::anyhow!("run_as_user not configured"))?;
196

197
    // Look up user
198
    let user = nix::unistd::User::from_name(username)?
199
        .ok_or_else(|| anyhow::anyhow!("User {} not found", username))?;
200

201
    // Set supplementary groups
202
    nix::unistd::setgroups(&[user.gid])?;
203

204
    // Drop to target group
205
    setgid(user.gid)?;
206

207
    // Drop to target user
208
    setuid(user.uid)?;
209

210
    info!("Dropped privileges to user: {}", username);
211
    Ok(())
212
}

1
use super::*;
2
use sd_notify::{notify, NotifyState};
3
use nix::sys::signal::{self, Signal};
4
use tokio::signal::unix::{signal, SignalKind};
5

6
pub struct LinuxService {
7
    inner: SecurityService,
8
    systemd_enabled: bool,
9
}
10

11
impl LinuxService {
12
    pub fn new(config: Config) -> Result<Self> {
13
        let systemd_enabled = sd_notify::booted().unwrap_or(false);
14

15
        Ok(Self {
16
            inner: SecurityService::new(config)?,
17
            systemd_enabled,
18
        })
19
    }
20

21
    pub async fn run(mut self) -> Result<()> {
22
        // Initialize service
23
        self.inner.initialize().await?;
24

25
        // Setup signal handlers
26
        let mut sigterm = signal(SignalKind::terminate())?;
27
        let mut sigint = signal(SignalKind::interrupt())?;
28
        let mut sighup = signal(SignalKind::hangup())?;
29

30
        // Start service
31
        self.inner.start().await?;
32

33
        // Notify systemd we're ready
34
        if self.systemd_enabled {
35
            notify(&[NotifyState::Ready])?;
36

37
            // Send watchdog keepalive in background
38
            tokio::spawn(async {
39
                let mut interval = tokio::time::interval(
40
                    tokio::time::Duration::from_secs(30)
41
                );
42

43
                loop {
44
                    interval.tick().await;
45
                    let _ = notify(&[NotifyState::Watchdog]);
46
                }
47
            });
48
        }
49

50
        // Wait for signals
51
        loop {
52
            tokio::select! {
53
                _ = sigterm.recv() => {
54
                    info!("Received SIGTERM");
55
                    break;
56
                }
57
                _ = sigint.recv() => {
58
                    info!("Received SIGINT");
59
                    break;
60
                }
61
                _ = sighup.recv() => {
62
                    info!("Received SIGHUP, reloading configuration");
63
                    self.inner.handle_control_event(ControlEvent::Reload).await?;
64
                }
65
            }
66
        }
67

68
        // Notify systemd we're stopping
69
        if self.systemd_enabled {
70
            notify(&[NotifyState::Stopping])?;
71
        }
72

73
        // Stop service
74
        self.inner.stop().await?;
75

76
        Ok(())
77
    }
78
}
79

80
// systemd service file
81
pub const SYSTEMD_SERVICE: &str = r#"
82
[Unit]
83
Description=Security Monitoring Service
84
Documentation=https://example.com/docs
85
After=network-online.target
86
Wants=network-online.target
87

88
[Service]
89
Type=notify
90
ExecStart=/usr/local/bin/security-service
91
ExecReload=/bin/kill -HUP $MAINPID
92
KillMode=mixed
93
KillSignal=SIGTERM
94
Restart=on-failure
95
RestartSec=5s
96
WatchdogSec=60s
97

98
# Security hardening
99
User=security-service
100
Group=security-service
101
NoNewPrivileges=true
102
PrivateTmp=true
103
ProtectSystem=strict
104
ProtectHome=true
105
ReadWritePaths=/var/lib/security-service /var/log/security-service
106
ProtectKernelTunables=true
107
ProtectKernelModules=true
108
ProtectControlGroups=true
109
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
110
RestrictNamespaces=true
111
LockPersonality=true
112
MemoryDenyWriteExecute=true
113
RestrictRealtime=true
114
RestrictSUIDSGID=true
115
RemoveIPC=true
116
PrivateMounts=true
117

118
# Resource limits
119
LimitNOFILE=65535
120
LimitNPROC=512
121
MemoryMax=1G
122
CPUQuota=50%
123

124
[Install]
125
WantedBy=multi-user.target
126
"#;

1
use super::*;
2
use windows_service::{
3
    define_windows_service,
4
    service::{
5
        ServiceControl, ServiceControlAccept, ServiceExitCode,
6
        ServiceState, ServiceStatus, ServiceType,
7
    },
8
    service_control_handler::{self, ServiceControlHandlerResult},
9
    service_dispatcher,
10
};
11
use std::ffi::OsString;
12
use std::sync::Mutex;
13
use std::time::Duration;
14
use once_cell::sync::Lazy;
15

16
static SERVICE_CONTROL: Lazy<Mutex<Option<tokio::sync::mpsc::Sender<ControlEvent>>>> =
17
    Lazy::new(|| Mutex::new(None));
18

19
pub struct WindowsService {
20
    inner: SecurityService,
21
}
22

23
impl WindowsService {
24
    pub fn new(config: Config) -> Result<Self> {
25
        Ok(Self {
26
            inner: SecurityService::new(config)?,
27
        })
28
    }
29

30
    pub fn run() -> Result<()> {
31
        // Register service with Windows
32
        service_dispatcher::start("SecurityService", ffi_service_main)?;
33
        Ok(())
34
    }
35
}
36

37
define_windows_service!(ffi_service_main, service_main);
38

39
fn service_main(_arguments: Vec<OsString>) {
40
    if let Err(e) = run_service() {
41
        error!("Service error: {}", e);
42
    }
43
}
44

45
fn run_service() -> Result<()> {
46
    // Create runtime
47
    let runtime = tokio::runtime::Runtime::new()?;
48

49
    // Load configuration
50
    let config = runtime.block_on(Config::load())?;
51

52
    // Create service
53
    let mut service = WindowsService::new(config)?;
54

55
    // Create control channel
56
    let (control_tx, mut control_rx) = tokio::sync::mpsc::channel(16);
57

58
    // Store sender for control handler
59
    {
60
        let mut control = SERVICE_CONTROL.lock().unwrap();
61
        *control = Some(control_tx);
62
    }
63

64
    // Define control handler
65
    let event_handler = move |control_event| -> ServiceControlHandlerResult {
66
        match control_event {
67
            ServiceControl::Stop => {
68
                if let Some(tx) = SERVICE_CONTROL.lock().unwrap().as_ref() {
69
                    let _ = tx.blocking_send(ControlEvent::Stop);
70
                }
71
                ServiceControlHandlerResult::NoError
72
            }
73
            ServiceControl::Interrogate => ServiceControlHandlerResult::NoError,
74
            _ => ServiceControlHandlerResult::NotImplemented,
75
        }
76
    };
77

78
    // Register control handler
79
    let status_handle = service_control_handler::register(
80
        "SecurityService",
81
        event_handler,
82
    )?;
83

84
    // Report starting
85
    status_handle.set_service_status(ServiceStatus {
86
        service_type: ServiceType::OWN_PROCESS,
87
        current_state: ServiceState::StartPending,
88
        controls_accepted: ServiceControlAccept::empty(),
89
        exit_code: ServiceExitCode::Win32(0),
90
        checkpoint: 0,
91
        wait_hint: Duration::from_secs(10),
92
        process_id: None,
93
    })?;
94

95
    // Run service
96
    runtime.block_on(async {
97
        // Initialize
98
        service.inner.initialize().await?;
99

100
        // Start service
101
        service.inner.start().await?;
102

103
        // Report running
104
        status_handle.set_service_status(ServiceStatus {
105
            service_type: ServiceType::OWN_PROCESS,
106
            current_state: ServiceState::Running,
107
            controls_accepted: ServiceControlAccept::STOP,
108
            exit_code: ServiceExitCode::Win32(0),
109
            checkpoint: 0,
110
            wait_hint: Duration::default(),
111
            process_id: None,
112
        })?;
113

114
        // Wait for control events
115
        while let Some(event) = control_rx.recv().await {
116
            match event {
117
                ControlEvent::Stop => {
118
                    // Report stopping
119
                    status_handle.set_service_status(ServiceStatus {
120
                        service_type: ServiceType::OWN_PROCESS,
121
                        current_state: ServiceState::StopPending,
122
                        controls_accepted: ServiceControlAccept::empty(),
123
                        exit_code: ServiceExitCode::Win32(0),
124
                        checkpoint: 0,
125
                        wait_hint: Duration::from_secs(10),
126
                        process_id: None,
127
                    })?;
128

129
                    // Stop service
130
                    service.inner.stop().await?;
131

132
                    // Report stopped
133
                    status_handle.set_service_status(ServiceStatus {
134
                        service_type: ServiceType::OWN_PROCESS,
135
                        current_state: ServiceState::Stopped,
136
                        controls_accepted: ServiceControlAccept::empty(),
137
                        exit_code: ServiceExitCode::Win32(0),
138
                        checkpoint: 0,
139
                        wait_hint: Duration::default(),
140
                        process_id: None,
141
                    })?;
142

143
                    break;
144
                }
145
                _ => {
146
                    service.inner.handle_control_event(event).await?;
147
                }
148
            }
149
        }
150

151
        Ok::<(), anyhow::Error>(())
152
    })?;
153

154
    Ok(())
155
}

1
use serde::{Deserialize, Serialize};
2
use config::{Config as ConfigBuilder, ConfigError, Environment, File};
3
use std::path::PathBuf;
4
use validator::{Validate, ValidationError};
5

6
#[derive(Debug, Clone, Deserialize, Serialize, Validate)]
7
pub struct Config {
8
    #[validate]
9
    pub service: ServiceConfig,
10

11
    #[validate]
12
    pub security: SecurityConfig,
13

14
    #[validate]
15
    pub monitoring: MonitoringConfig,
16

17
    #[validate]
18
    pub api: ApiConfig,
19

20
    #[validate]
21
    pub logging: LoggingConfig,
22
}
23

24
#[derive(Debug, Clone, Deserialize, Serialize, Validate)]
25
pub struct ServiceConfig {
26
    #[validate(length(min = 1))]
27
    pub name: String,
28

29
    pub description: Option<String>,
30

31
    #[cfg(unix)]
32
    pub run_as_user: Option<String>,
33

34
    #[cfg(unix)]
35
    pub run_as_group: Option<String>,
36

37
    #[validate(range(min = 1024, max = 65535))]
38
    pub port: u16,
39

40
    pub bind_address: String,
41
}
42

43
#[derive(Debug, Clone, Deserialize, Serialize, Validate)]
44
pub struct SecurityConfig {
45
    pub tls_cert_path: PathBuf,
46
    pub tls_key_path: PathBuf,
47

48
    #[validate(range(min = 8, max = 128))]
49
    pub min_password_length: usize,
50

51
    pub require_mfa: bool,
52

53
    #[validate(range(min = 1, max = 86400))]
54
    pub session_timeout_seconds: u64,
55

56
    #[validate(range(min = 1, max = 100))]
57
    pub max_login_attempts: u32,
58

59
    pub allowed_origins: Vec<String>,
60
}
61

62
#[derive(Debug, Clone, Deserialize, Serialize, Validate)]
63
pub struct MonitoringConfig {
64
    #[validate(range(min = 1, max = 3600))]
65
    pub metrics_interval_seconds: u64,
66

67
    pub enable_prometheus: bool,
68

69
    #[validate(url)]
70
    pub prometheus_push_gateway: Option<String>,
71

72
    pub alert_thresholds: AlertThresholds,
73
}
74

75
#[derive(Debug, Clone, Deserialize, Serialize, Validate)]
76
pub struct AlertThresholds {
77
    #[validate(range(min = 0.0, max = 100.0))]
78
    pub cpu_percent: f64,
79

80
    #[validate(range(min = 0.0, max = 100.0))]
81
    pub memory_percent: f64,
82

83
    #[validate(range(min = 0, max = 100000))]
84
    pub error_rate_per_minute: u64,
85
}
86

87
#[derive(Debug, Clone, Deserialize, Serialize, Validate)]
88
pub struct ApiConfig {
89
    #[validate(range(min = 1, max = 10000))]
90
    pub rate_limit_per_minute: u32,
91

92
    #[validate(range(min = 1, max = 1000))]
93
    pub max_request_size_mb: usize,
94

95
    #[validate(range(min = 1, max = 300))]
96
    pub request_timeout_seconds: u64,
97
}
98

99
#[derive(Debug, Clone, Deserialize, Serialize, Validate)]
100
pub struct LoggingConfig {
101
    pub level: String,
102
    pub format: LogFormat,
103
    pub output: LogOutput,
104
    pub file_path: Option<PathBuf>,
105

106
    #[validate(range(min = 1, max = 1000))]
107
    pub max_file_size_mb: usize,
108

109
    #[validate(range(min = 1, max = 100))]
110
    pub max_files: usize,
111
}
112

113
#[derive(Debug, Clone, Deserialize, Serialize)]
114
#[serde(rename_all = "lowercase")]
115
pub enum LogFormat {
116
    Json,
117
    Pretty,
118
    Compact,
119
}
120

121
#[derive(Debug, Clone, Deserialize, Serialize)]
122
#[serde(rename_all = "lowercase")]
123
pub enum LogOutput {
124
    Stdout,
125
    File,
126
    Both,
127
}
128

129
impl Config {
130
    pub async fn load() -> Result<Self> {
131
        let config_dir = Self::get_config_dir()?;
132
        let environment = std::env::var("SERVICE_ENV")
133
            .unwrap_or_else(|_| "development".to_string());
134

135
        let config = ConfigBuilder::builder()
136
            // Start with default configuration
137
            .add_source(File::from(config_dir.join("default.toml")))
138
            // Layer on environment-specific config
139
            .add_source(
140
                File::from(config_dir.join(format!("{}.toml", environment)))
141
                    .required(false)
142
            )
143
            // Layer on environment variables
144
            .add_source(
145
                Environment::with_prefix("SECURITY_SERVICE")
146
                    .separator("__")
147
                    .try_parsing(true)
148
            )
149
            .build()?;
150

151
        let config: Config = config.try_deserialize()?;
152
        config.validate()?;
153

154
        Ok(config)
155
    }
156

157
    fn get_config_dir() -> Result<PathBuf> {
158
        // Check for explicit config directory
159
        if let Ok(dir) = std::env::var("CONFIG_DIR") {
160
            return Ok(PathBuf::from(dir));
161
        }
162

163
        // Use platform-specific defaults
164
        #[cfg(unix)]
165
        let config_dir = PathBuf::from("/etc/security-service");
166

167
        #[cfg(windows)]
168
        let config_dir = std::env::var("ProgramData")
169
            .map(|p| PathBuf::from(p).join("SecurityService"))
170
            .unwrap_or_else(|_| PathBuf::from("C:\\ProgramData\\SecurityService"));
171

172
        Ok(config_dir)
173
    }
174
}

1
use anyhow::Result;
2
use std::sync::Arc;
3
use tokio::sync::RwLock;
4
use crate::config::Config;
5

6
pub struct SecurityEngine {
7
    threat_detector: Arc<ThreatDetector>,
8
    access_controller: Arc<AccessController>,
9
    audit_logger: Arc<AuditLogger>,
10
}
11

12
impl SecurityEngine {
13
    pub fn new() -> Result<Self> {
14
        Ok(Self {
15
            threat_detector: Arc::new(ThreatDetector::new()?),
16
            access_controller: Arc::new(AccessController::new()?),
17
            audit_logger: Arc::new(AuditLogger::new()?),
18
        })
19
    }
20

21
    pub async fn initialize(&self, config: &Config) -> Result<()> {
22
        self.threat_detector.initialize(config).await?;
23
        self.access_controller.initialize(config).await?;
24
        self.audit_logger.initialize(config).await?;
25
        Ok(())
26
    }
27

28
    pub async fn check_threats(&self) -> Result<()> {
29
        // Run threat detection logic
30
        let threats = self.threat_detector.scan().await?;
31

32
        // Log any detected threats
33
        for threat in threats {
34
            self.audit_logger.log_threat(&threat).await?;
35

36
            // Take action based on threat severity
37
            match threat.severity {
38
                ThreatSeverity::Critical => {
39
                    // Immediate response
40
                    self.respond_to_critical_threat(&threat).await?;
41
                }
42
                ThreatSeverity::High => {
43
                    // Alert administrators
44
                    self.alert_administrators(&threat).await?;
45
                }
46
                _ => {
47
                    // Log for analysis
48
                }
49
            }
50
        }
51

52
        Ok(())
53
    }
54

55
    pub async fn shutdown(&self) -> Result<()> {
56
        self.audit_logger.flush().await?;
57
        Ok(())
58
    }
59

60
    async fn respond_to_critical_threat(&self, threat: &Threat) -> Result<()> {
61
        // Implement immediate response logic
62
        // e.g., block IP, terminate process, isolate system
63
        Ok(())
64
    }
65

66
    async fn alert_administrators(&self, threat: &Threat) -> Result<()> {
67
        // Send alerts via configured channels
68
        // e.g., email, SMS, Slack, PagerDuty
69
        Ok(())
70
    }
71
}