security-rust 2.1.1

A pure Rust attack detection library with 32 detectors across 4 categories — injection, protocol, data, and file — plus stateful session, throttling, and risk scoring. Zero framework dependencies.
Documentation 
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// Copyright (c) 2026 erik <erik@erik.xyz> — https://erik.xyz

use crate::{AttackCategory, DetectionResult, Detector, Severity, regex_detect};
use regex::Regex;
use std::sync::LazyLock;

static PATTERNS: LazyLock<Vec<Regex>> = LazyLock::new(|| {
    vec![
        Regex::new(r"(?i)__schema").unwrap(),
        Regex::new(r"(?i)__type\s*\{").unwrap(),
        Regex::new(r"(?i)__typename").unwrap(),
        Regex::new(r"\{[^{}]*\{[^{}]*\{[^{}]*\{[^{}]*\{").unwrap(),
    ]
});

pub struct GraphQlInjectionDetector;

impl Detector for GraphQlInjectionDetector {
    fn name(&self) -> &'static str {
        "graphql_injection"
    }

    fn detect(&self, input: &str) -> Option<DetectionResult> {
        regex_detect(
            &PATTERNS,
            self.name(),
            AttackCategory::Injection,
            Severity::Medium,
            "GraphQL injection/introspection detected",
            input,
        )
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn det() -> GraphQlInjectionDetector {
        GraphQlInjectionDetector
    }

    fn assert_hit(input: &str) {
        crate::test_helpers::assert_detected(
            &det(),
            input,
            AttackCategory::Injection,
            Severity::Medium,
        );
    }

    #[test]
    fn name_is_graphql_injection() {
        assert_eq!(det().name(), "graphql_injection");
    }

    #[test]
    fn detects_common_payloads() {
        for input in [
            "{ __schema { types { name } } }",
            "query { __type { name } }",
            "query { __typename }",
            "{a{b{c{d{e{f}}}}}}",
            "fragment F on __Type { name }",
        ] {
            assert_hit(input);
        }
    }

    #[test]
    fn benign_inputs_not_detected() {
        for input in [
            "Hello, this is a normal text input. Nothing suspicious here.",
            "query { user(id: 1) { name } }",
            r#"{"a": {"b": {"c": {"d": 1}}}}"#,
            "The schema was updated today",
        ] {
            assert!(det().detect(input).is_none(), "false positive: {input}");
        }
    }

    #[test]
    fn edge_cases() {
        assert!(det().detect("").is_none());
        assert!(det().detect(" \t\n ").is_none());
        assert!(det().detect("你好世界 こんにちは").is_none());
        // near misses: not quite the introspection keyword, or not deep enough
        assert!(det().detect("{__schem}").is_none());
        assert!(det().detect("schema").is_none());
        assert!(det().detect("{{{{").is_none());
    }

    #[test]
    fn obfuscated_variants_detected() {
        for input in ["{ __SCHEMA { types } }", "__TYPENAME", "__Type { name }"] {
            assert_hit(input);
        }
    }
}