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Add sandbox column and security-based service status

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Add new "SB" column to services widget showing systemd sandboxing status.
Service status now reflects security posture with unsandboxed services
showing as degraded/warning status.

Changes:
- Add is_sandboxed field to ServiceData and ServiceInfo structs
- Add check_service_sandbox method detecting systemd hardening features
- Add format_sandbox_value function showing "yes"/"no" for sandboxing
- Update service status determination to consider sandbox status:
  - Sandboxed + Running = "Running" (green/ok)
  - Unsandboxed + Running = "Degraded" (yellow/warning)
  - Failed services = "Stopped" (red/critical)
- Add "SB" column header to services widget

Services without proper NixOS hardening (PrivateTmp, ProtectSystem, etc.)
now show warning status to highlight security concerns.
This commit is contained in:
Christoffer Martinsson
2025-10-14 11:18:07 +02:00
parent 17dda1ae67
commit 4fa2b079f1
3 changed files with 124 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

130
agent/src/collectors/service.rs
View File

@@ -79,7 +79,10 @@ impl ServiceCollector {
}
}
let status = self.determine_service_status(&active_state, &sub_state);
// Check if service is sandboxed (needed for status determination)
let is_sandboxed = self.check_service_sandbox(service).await.unwrap_or(false);
let status = self.determine_service_status(&active_state, &sub_state, is_sandboxed);
// Get resource usage if service is running
let (memory_used_mb, cpu_percent) = if let Some(pid) = main_pid {
@@ -121,6 +124,7 @@ impl ServiceCollector {
sandbox_limit: None, // TODO: Implement sandbox limit detection
disk_used_gb,
disk_quota_gb,
is_sandboxed,
description,
sub_service: None,
})
@@ -130,10 +134,25 @@ impl ServiceCollector {
&self,
active_state: &Option<String>,
sub_state: &Option<String>,
is_sandboxed: bool,
) -> ServiceStatus {
match (active_state.as_deref(), sub_state.as_deref()) {
(Some("active"), Some("running")) => ServiceStatus::Running,
(Some("active"), Some("exited")) => ServiceStatus::Running, // One-shot services
(Some("active"), Some("running")) => {
// Running services should be degraded if not sandboxed
if is_sandboxed {
ServiceStatus::Running
} else {
ServiceStatus::Degraded // Warning status for unsandboxed running services
}
},
(Some("active"), Some("exited")) => {
// One-shot services should also be degraded if not sandboxed
if is_sandboxed {
ServiceStatus::Running
} else {
ServiceStatus::Degraded
}
},
(Some("reloading"), _) | (Some("activating"), _) => ServiceStatus::Restarting,
(Some("failed"), _) | (Some("inactive"), Some("failed")) => ServiceStatus::Stopped,
(Some("inactive"), _) => ServiceStatus::Stopped,
@@ -266,35 +285,58 @@ impl ServiceCollector {
}
async fn get_service_disk_quota(&self, service: &str) -> Result<f32, CollectorError> {
// Check systemd for disk-related limits (limited options available)
// Most systemd services don't have disk quotas, but we can check for some storage-related settings
// Check for filesystem quotas on service data directories
let service_paths = vec![
format!("/var/lib/{}", service),
format!("/opt/{}", service),
format!("/srv/{}", service),
];
for path in &service_paths {
if tokio::fs::metadata(path).await.is_ok() {
// Try quota command (if available)
if let Ok(quota_gb) = self.check_filesystem_quota(path).await {
if quota_gb > 0.0 {
return Ok(quota_gb);
// Check systemd service properties for NixOS hardening-related disk restrictions
let systemd_output = Command::new("/run/current-system/sw/bin/systemctl")
.args(["show", service, "--property=PrivateTmp,ProtectHome,ProtectSystem,ReadOnlyPaths,InaccessiblePaths,BindPaths,BindReadOnlyPaths", "--no-pager"])
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.output()
.await;
if let Ok(output) = systemd_output {
if output.status.success() {
let stdout = String::from_utf8_lossy(&output.stdout);
// Parse systemd properties that might indicate disk restrictions
let mut private_tmp = false;
let mut protect_system = false;
let mut readonly_paths = Vec::new();
for line in stdout.lines() {
if line.starts_with("PrivateTmp=yes") {
private_tmp = true;
} else if line.starts_with("ProtectSystem=strict") || line.starts_with("ProtectSystem=yes") {
protect_system = true;
} else if let Some(paths) = line.strip_prefix("ReadOnlyPaths=") {
readonly_paths.push(paths.to_string());
}
}
// If service has significant restrictions, it might have implicit disk limits
// This is heuristic-based since systemd doesn't have direct disk quotas
if private_tmp && protect_system {
// Heavily sandboxed services might have practical disk limits
// Return a conservative estimate based on typical service needs
return Ok(1.0); // 1 GB as reasonable limit for sandboxed services
}
}
}
// Service-specific quota detection
// Check for service-specific disk configurations in NixOS
match service {
"docker" => {
// Docker might have storage driver limits
// Docker might have storage driver limits in NixOS config
if let Ok(limit) = self.get_docker_storage_quota().await {
return Ok(limit);
}
},
"postgresql" | "postgres" => {
// PostgreSQL might have tablespace or data directory limits
// Check for database-specific storage configuration
},
"mysql" | "mariadb" => {
// MySQL might have data directory size limits
},
_ => {}
}
@@ -338,6 +380,48 @@ impl ServiceCollector {
message: "Docker storage quota detection not implemented".to_string(),
})
}
async fn check_service_sandbox(&self, service: &str) -> Result<bool, CollectorError> {
// Check systemd service properties for sandboxing/hardening settings
let systemd_output = Command::new("/run/current-system/sw/bin/systemctl")
.args(["show", service, "--property=PrivateTmp,ProtectHome,ProtectSystem,NoNewPrivileges,PrivateDevices,ProtectKernelTunables,RestrictRealtime", "--no-pager"])
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.output()
.await;
if let Ok(output) = systemd_output {
if output.status.success() {
let stdout = String::from_utf8_lossy(&output.stdout);
let mut sandbox_indicators = 0;
let mut total_checks = 0;
for line in stdout.lines() {
total_checks += 1;
// Check for various sandboxing properties
if line.starts_with("PrivateTmp=yes") ||
line.starts_with("ProtectHome=yes") ||
line.starts_with("ProtectSystem=strict") ||
line.starts_with("ProtectSystem=yes") ||
line.starts_with("NoNewPrivileges=yes") ||
line.starts_with("PrivateDevices=yes") ||
line.starts_with("ProtectKernelTunables=yes") ||
line.starts_with("RestrictRealtime=yes") {
sandbox_indicators += 1;
}
}
// Consider service sandboxed if it has multiple hardening features
let is_sandboxed = sandbox_indicators >= 3;
return Ok(is_sandboxed);
}
}
// Default to not sandboxed if we can't determine
Ok(false)
}
async fn get_service_memory_limit(&self, service: &str) -> Result<f32, CollectorError> {
let output = Command::new("/run/current-system/sw/bin/systemctl")
@@ -1229,6 +1313,7 @@ impl Collector for ServiceCollector {
sandbox_limit: None,
disk_used_gb: 0.0,
disk_quota_gb: 0.0,
is_sandboxed: false, // Sub-services inherit parent sandbox status
description: None,
sub_service: Some("nginx".to_string()),
});
@@ -1255,6 +1340,7 @@ impl Collector for ServiceCollector {
sandbox_limit: None,
disk_used_gb: 0.0,
disk_quota_gb: 0.0,
is_sandboxed: true, // Docker containers are inherently sandboxed
description: None,
sub_service: Some("docker".to_string()),
});
@@ -1277,6 +1363,7 @@ impl Collector for ServiceCollector {
sandbox_limit: None,
disk_used_gb: 0.0,
disk_quota_gb: 0.0,
is_sandboxed: false, // Unknown for failed services
description: None,
sub_service: None,
});
@@ -1337,6 +1424,7 @@ struct ServiceData {
sandbox_limit: Option<f32>,
disk_used_gb: f32,
disk_quota_gb: f32,
is_sandboxed: bool,
#[serde(skip_serializing_if = "Option::is_none")]
description: Option<Vec<String>>,
#[serde(default)]