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🛡️ Sentinel: [CRITICAL] Fix TOCTOU symlink attack in permission hardening #408

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🛡️ Sentinel: [CRITICAL] Fix TOCTOU symlink attack in permission hardening #408

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15 changes: 11 additions & 4 deletions Sources/Cacheout/Headless/DaemonMode.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -295,10 +295,17 @@ public actor DaemonMode: StatusSocket.DataSource {
withIntermediateDirectories: true,
attributes: [.posixPermissions: 0o700]
)
try FileManager.default.setAttributes(
[.posixPermissions: 0o700],
ofItemAtPath: config.stateDir.path
)
let fd = config.stateDir.withUnsafeFileSystemRepresentation { pathPtr -> Int32 in
guard let pathPtr = pathPtr else { return -1 }
return open(pathPtr, O_RDONLY | O_NOFOLLOW | O_DIRECTORY | O_CLOEXEC)
}
guard fd >= 0 else {
throw NSError(domain: NSPOSIXErrorDomain, code: Int(errno), userInfo: nil)
}
defer { close(fd) }
guard fchmod(fd, 0o700) == 0 else {
throw NSError(domain: NSPOSIXErrorDomain, code: Int(errno), userInfo: nil)
}
} catch {
logger.error("Failed to create/secure state directory: \(error.localizedDescription, privacy: .public)")
Foundation.exit(1)
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