security_rust/protocol/
open_redirect.rs

1// Copyright (c) 2026 erik <erik@erik.xyz> — https://erik.xyz
2
3use regex::Regex;
4use std::sync::LazyLock;
5
6use crate::{AttackCategory, DetectionResult, Detector, Severity};
7
8static PATTERNS: LazyLock<Vec<Regex>> = LazyLock::new(|| {
9    vec![
10        Regex::new(r"(?i)//[^/\s]+\.[a-z]{2,}").unwrap(),
11        Regex::new(r"(?i)javascript\s*:").unwrap(),
12        Regex::new(r"(?i)data\s*:\s*text/html").unwrap(),
13        Regex::new(r"(?i)data\s*:\s*text/plain").unwrap(),
14    ]
15});
16
17pub struct OpenRedirectDetector;
18
19impl Detector for OpenRedirectDetector {
20    fn name(&self) -> &'static str {
21        "open_redirect"
22    }
23
24    fn detect(&self, input: &str) -> Option<DetectionResult> {
25        for re in PATTERNS.iter() {
26            if let Some(m) = re.find(input) {
27                let start = m.start();
28                // Skip // matches that are part of a URL scheme (e.g. https://)
29                if start > 0 && input.as_bytes()[start - 1] == b':' {
30                    continue;
31                }
32                return Some(DetectionResult {
33                    attack_type: "open_redirect".into(),
34                    category: AttackCategory::Protocol,
35                    severity: Severity::Medium,
36                    matched_pattern: m.as_str().to_string(),
37                    offset: start,
38                    message: "Open redirect detected".into(),
39                });
40            }
41        }
42        None
43    }
44}
security_rust/protocol/open_redirect.rs

security_rust/protocol/
open_redirect.rs
