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lewis.moe
1use reqwest::{Client, ClientBuilder, Url};
2use std::net::{IpAddr, SocketAddr, ToSocketAddrs};
3use std::sync::OnceLock;
4use std::time::Duration;
5use tracing::warn;
6
7pub const DEFAULT_HEADERS_TIMEOUT: Duration = Duration::from_secs(10);
8pub const DEFAULT_BODY_TIMEOUT: Duration = Duration::from_secs(30);
9pub const DEFAULT_CONNECT_TIMEOUT: Duration = Duration::from_secs(5);
10pub const MAX_RESPONSE_SIZE: u64 = 10 * 1024 * 1024;
11
12static PROXY_CLIENT: OnceLock<Client> = OnceLock::new();
13
14pub fn proxy_client() -> &'static Client {
15 PROXY_CLIENT.get_or_init(|| {
16 ClientBuilder::new()
17 .timeout(DEFAULT_BODY_TIMEOUT)
18 .connect_timeout(DEFAULT_CONNECT_TIMEOUT)
19 .pool_max_idle_per_host(10)
20 .pool_idle_timeout(Duration::from_secs(90))
21 .redirect(reqwest::redirect::Policy::none())
22 .build()
23 .expect("Failed to build HTTP client - this indicates a TLS or system configuration issue")
24 })
25}
26
27pub fn is_ssrf_safe(url: &str) -> Result<(), SsrfError> {
28 let parsed = Url::parse(url).map_err(|_| SsrfError::InvalidUrl)?;
29 let scheme = parsed.scheme();
30 if scheme != "https" {
31 let allow_http = std::env::var("ALLOW_HTTP_PROXY").is_ok()
32 || url.starts_with("http://127.0.0.1")
33 || url.starts_with("http://localhost");
34 if !allow_http {
35 return Err(SsrfError::InsecureProtocol(scheme.to_string()));
36 }
37 }
38 let host = parsed.host_str().ok_or(SsrfError::NoHost)?;
39 if host == "localhost" {
40 return Ok(());
41 }
42 if let Ok(ip) = host.parse::<IpAddr>() {
43 if ip.is_loopback() {
44 return Ok(());
45 }
46 if !is_unicast_ip(&ip) {
47 return Err(SsrfError::NonUnicastIp(ip.to_string()));
48 }
49 return Ok(());
50 }
51 let port = parsed.port().unwrap_or(if scheme == "https" { 443 } else { 80 });
52 let socket_addrs: Vec<SocketAddr> = match (host, port).to_socket_addrs() {
53 Ok(addrs) => addrs.collect(),
54 Err(_) => return Err(SsrfError::DnsResolutionFailed(host.to_string())),
55 };
56 for addr in &socket_addrs {
57 if !is_unicast_ip(&addr.ip()) {
58 warn!(
59 "DNS resolution for {} returned non-unicast IP: {}",
60 host,
61 addr.ip()
62 );
63 return Err(SsrfError::NonUnicastIp(addr.ip().to_string()));
64 }
65 }
66 Ok(())
67}
68
69fn is_unicast_ip(ip: &IpAddr) -> bool {
70 match ip {
71 IpAddr::V4(v4) => {
72 !v4.is_loopback()
73 && !v4.is_broadcast()
74 && !v4.is_multicast()
75 && !v4.is_unspecified()
76 && !v4.is_link_local()
77 && !is_private_v4(v4)
78 }
79 IpAddr::V6(v6) => !v6.is_loopback() && !v6.is_multicast() && !v6.is_unspecified(),
80 }
81}
82
83fn is_private_v4(ip: &std::net::Ipv4Addr) -> bool {
84 let octets = ip.octets();
85 octets[0] == 10
86 || (octets[0] == 172 && (16..=31).contains(&octets[1]))
87 || (octets[0] == 192 && octets[1] == 168)
88 || (octets[0] == 169 && octets[1] == 254)
89}
90
91#[derive(Debug, Clone)]
92pub enum SsrfError {
93 InvalidUrl,
94 InsecureProtocol(String),
95 NoHost,
96 NonUnicastIp(String),
97 DnsResolutionFailed(String),
98}
99
100impl std::fmt::Display for SsrfError {
101 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
102 match self {
103 SsrfError::InvalidUrl => write!(f, "Invalid URL"),
104 SsrfError::InsecureProtocol(p) => write!(f, "Insecure protocol: {}", p),
105 SsrfError::NoHost => write!(f, "No host in URL"),
106 SsrfError::NonUnicastIp(ip) => write!(f, "Non-unicast IP address: {}", ip),
107 SsrfError::DnsResolutionFailed(host) => write!(f, "DNS resolution failed for: {}", host),
108 }
109 }
110}
111
112impl std::error::Error for SsrfError {}
113
114pub const HEADERS_TO_FORWARD: &[&str] = &[
115 "accept-language",
116 "atproto-accept-labelers",
117 "x-bsky-topics",
118];
119pub const RESPONSE_HEADERS_TO_FORWARD: &[&str] = &[
120 "atproto-repo-rev",
121 "atproto-content-labelers",
122 "retry-after",
123 "content-type",
124];
125
126pub fn validate_at_uri(uri: &str) -> Result<AtUriParts, &'static str> {
127 if !uri.starts_with("at://") {
128 return Err("URI must start with at://");
129 }
130 let path = uri.trim_start_matches("at://");
131 let parts: Vec<&str> = path.split('/').collect();
132 if parts.is_empty() {
133 return Err("URI missing DID");
134 }
135 let did = parts[0];
136 if !did.starts_with("did:") {
137 return Err("Invalid DID in URI");
138 }
139 if parts.len() > 1 {
140 let collection = parts[1];
141 if collection.is_empty() || !collection.contains('.') {
142 return Err("Invalid collection NSID");
143 }
144 }
145 Ok(AtUriParts {
146 did: did.to_string(),
147 collection: parts.get(1).map(|s| s.to_string()),
148 rkey: parts.get(2).map(|s| s.to_string()),
149 })
150}
151
152#[derive(Debug, Clone)]
153pub struct AtUriParts {
154 pub did: String,
155 pub collection: Option<String>,
156 pub rkey: Option<String>,
157}
158
159pub fn validate_limit(limit: Option<u32>, default: u32, max: u32) -> u32 {
160 match limit {
161 Some(l) if l == 0 => default,
162 Some(l) if l > max => max,
163 Some(l) => l,
164 None => default,
165 }
166}
167
168pub fn validate_did(did: &str) -> Result<(), &'static str> {
169 if !did.starts_with("did:") {
170 return Err("Invalid DID format");
171 }
172 let parts: Vec<&str> = did.split(':').collect();
173 if parts.len() < 3 {
174 return Err("DID must have at least method and identifier");
175 }
176 let method = parts[1];
177 if method != "plc" && method != "web" {
178 return Err("Unsupported DID method");
179 }
180 Ok(())
181}
182
183#[cfg(test)]
184mod tests {
185 use super::*;
186 #[test]
187 fn test_ssrf_safe_https() {
188 assert!(is_ssrf_safe("https://api.bsky.app/xrpc/test").is_ok());
189 }
190 #[test]
191 fn test_ssrf_blocks_http_by_default() {
192 let result = is_ssrf_safe("http://external.example.com/xrpc/test");
193 assert!(matches!(result, Err(SsrfError::InsecureProtocol(_)) | Err(SsrfError::DnsResolutionFailed(_))));
194 }
195 #[test]
196 fn test_ssrf_allows_localhost_http() {
197 assert!(is_ssrf_safe("http://127.0.0.1:8080/test").is_ok());
198 assert!(is_ssrf_safe("http://localhost:8080/test").is_ok());
199 }
200 #[test]
201 fn test_validate_at_uri() {
202 let result = validate_at_uri("at://did:plc:test/app.bsky.feed.post/abc123");
203 assert!(result.is_ok());
204 let parts = result.unwrap();
205 assert_eq!(parts.did, "did:plc:test");
206 assert_eq!(parts.collection, Some("app.bsky.feed.post".to_string()));
207 assert_eq!(parts.rkey, Some("abc123".to_string()));
208 }
209 #[test]
210 fn test_validate_at_uri_invalid() {
211 assert!(validate_at_uri("https://example.com").is_err());
212 assert!(validate_at_uri("at://notadid/collection/rkey").is_err());
213 }
214 #[test]
215 fn test_validate_limit() {
216 assert_eq!(validate_limit(None, 50, 100), 50);
217 assert_eq!(validate_limit(Some(0), 50, 100), 50);
218 assert_eq!(validate_limit(Some(200), 50, 100), 100);
219 assert_eq!(validate_limit(Some(75), 50, 100), 75);
220 }
221 #[test]
222 fn test_validate_did() {
223 assert!(validate_did("did:plc:abc123").is_ok());
224 assert!(validate_did("did:web:example.com").is_ok());
225 assert!(validate_did("notadid").is_err());
226 assert!(validate_did("did:unknown:test").is_err());
227 }
228}