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//! Evasion configuration — knobs for the strategy engine.
//!
//! One struct, one job: controls which evasion layers are enabled
//! and how aggressively the engine escalates.
use serde::{Deserialize, Serialize};
/// Evasion configuration.
#[allow(clippy::struct_excessive_bools)]
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EvasionConfig {
/// Enable payload encoding transformations.
pub encoding_enabled: bool,
/// Enable Content-Type switching (form → JSON, XML, multipart).
pub content_type_switching: bool,
/// Enable browser fingerprint rotation (User-Agent, Accept, etc.).
pub fingerprint_rotation: bool,
/// Enable header obfuscation (case mixing, tab separators, folding).
pub header_obfuscation: bool,
/// Enable grammar-aware payload mutation (SQL/XSS/CMD transforms).
pub grammar_mutations: bool,
/// Enable request smuggling metadata generation.
pub smuggling_enabled: bool,
/// Enable HTTP/2 evasion metadata generation.
pub h2_evasion_enabled: bool,
/// Maximum evasion retry attempts before giving up.
pub max_attempts: u32,
/// Disable TLS verification (danger_accept_invalid_certs).
pub insecure_tls: bool,
/// Proxies for round-robin IP rotation.
#[serde(default)]
pub proxies: Vec<String>,
/// Manual origin bypass mapping from Host to IP.
#[serde(default)]
pub origin_bypass: std::collections::HashMap<String, std::net::IpAddr>,
/// Body padding (bytes) — pre-pend N bytes of inert filler to
/// JSON / form / multipart bodies so the malicious payload sits
/// past cloud-WAF inspection windows (Cloudflare Pro 8 KB, AWS
/// WAF 16 KB). 0 disables padding entirely. Anything below
/// `wafrift_evolution::body_padding::MIN_USEFUL_PAD` is silently
/// skipped at strategy time.
#[serde(default)]
pub body_padding_bytes: usize,
/// Mutate URL/query-param payload bytes (off by default).
///
/// When true, the evade pipeline applies the same encoding +
/// grammar mutations to query-string parameter VALUES (not
/// names) and to the path's last segment. This is the canonical
/// attack surface for SQLi-in-`?id=` / XSS-in-`?q=` etc — most
/// production attacks live in URL parameters, not request bodies.
///
/// **Off by default** because mutating the URL changes upstream
/// routing semantics (e.g. cache keys, log entries, downstream
/// handler dispatch). Operators must opt in via
/// `wafrift-proxy --mutate-url` (or set this field via TOML).
#[serde(default)]
pub mutate_url: bool,
}
impl Default for EvasionConfig {
fn default() -> Self {
Self {
encoding_enabled: true,
content_type_switching: true,
fingerprint_rotation: true,
header_obfuscation: true,
grammar_mutations: true,
smuggling_enabled: true,
h2_evasion_enabled: true,
max_attempts: 5,
insecure_tls: false,
proxies: Vec::new(),
origin_bypass: std::collections::HashMap::new(),
body_padding_bytes: 0,
mutate_url: false,
}
}
}
impl EvasionConfig {
/// Create a minimal config with only encoding enabled.
#[must_use]
pub fn encoding_only() -> Self {
Self {
encoding_enabled: true,
content_type_switching: false,
fingerprint_rotation: false,
header_obfuscation: false,
grammar_mutations: false,
smuggling_enabled: false,
h2_evasion_enabled: false,
max_attempts: 3,
insecure_tls: false,
proxies: Vec::new(),
origin_bypass: std::collections::HashMap::new(),
body_padding_bytes: 0,
mutate_url: false,
}
}
/// Create a maximum-aggression config with everything enabled.
#[must_use]
pub fn maximum() -> Self {
Self {
encoding_enabled: true,
content_type_switching: true,
fingerprint_rotation: true,
header_obfuscation: true,
grammar_mutations: true,
smuggling_enabled: true,
h2_evasion_enabled: true,
max_attempts: 10,
insecure_tls: false,
proxies: Vec::new(),
origin_bypass: std::collections::HashMap::new(),
// Default to AWS-WAF-default-tier (16 KB) — covers
// Cloudflare Pro (8 KB), AWS WAF default, Akamai default.
body_padding_bytes: 16 * 1024,
// maximum() is opt-in aggression — flip URL mutation on
// too. Operators reaching for `maximum()` already accept
// the routing-semantics tradeoffs.
mutate_url: true,
}
}
/// Validate the configuration for conflicts or missing dependencies.
pub fn validate(&self) -> Result<(), String> {
if self.insecure_tls {
tracing::warn!(
"TLS certificate validation is disabled (--insecure-tls). Do not use in production."
);
}
if self.grammar_mutations && !self.encoding_enabled {
tracing::warn!(
"Grammar mutations are enabled but encoding is disabled. Mutations may require encoding to bypass effectively."
);
}
if self.max_attempts == 0 {
return Err("max_attempts must be greater than 0".to_string());
}
self.validate_proxies()?;
Ok(())
}
/// Validate the format of proxies.
fn validate_proxies(&self) -> Result<(), String> {
for proxy in &self.proxies {
if !proxy.starts_with("http://")
&& !proxy.starts_with("https://")
&& !proxy.starts_with("socks5://")
&& !proxy.starts_with("socks5h://")
{
return Err(format!(
"Invalid proxy URL '{}': must start with http://, https://, socks5://, or socks5h://",
proxy
));
}
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn default_config_all_enabled() {
let config = EvasionConfig::default();
assert!(config.encoding_enabled);
assert!(config.content_type_switching);
assert!(config.fingerprint_rotation);
assert!(config.header_obfuscation);
assert!(config.grammar_mutations);
assert!(config.smuggling_enabled);
assert!(config.h2_evasion_enabled);
assert_eq!(config.max_attempts, 5);
assert!(!config.insecure_tls);
}
#[test]
fn encoding_only_config() {
let config = EvasionConfig::encoding_only();
assert!(config.encoding_enabled);
assert!(!config.content_type_switching);
assert!(!config.grammar_mutations);
}
#[test]
fn maximum_config() {
let config = EvasionConfig::maximum();
assert!(config.grammar_mutations);
assert_eq!(config.max_attempts, 10);
}
#[test]
fn config_serde_roundtrip() {
let config = EvasionConfig::default();
let json = serde_json::to_string(&config).expect("serialize");
let deserialized: EvasionConfig = serde_json::from_str(&json).expect("deserialize");
assert_eq!(deserialized.max_attempts, config.max_attempts);
}
}