请求host不匹配时重新生成证书

core_vpn/Cargo.toml

@@ -13,7 +13,7 @@ tokio = { version = "1.47.5", features = ["full"] }
 tokio-rustls = "0.26"
 rustls-pemfile = "2"
 jni = "0.22.4"
-rcgen = "0.14"
+rcgen = { version = "0.14", features = ["x509-parser"] }
 anyhow = "1"
 bytes = "1"
 tokio-util = "0.7.20"

core_vpn/build.rs

@@ -1,156 +1,13 @@
-use rcgen::{
-    CertificateParams, DistinguishedName, DnType, ExtendedKeyUsagePurpose, IsCa, KeyPair,
-    KeyUsagePurpose, SanType,
-};
 use std::{env, fs, path::PathBuf};
-
+#[path = "src/cert.rs"]
-const CA_KEY: &str = "-----BEGIN PRIVATE KEY-----
+mod cert;
-MIG2AgEAMBAGByqGSM49AgEGBSuBBAAiBIGeMIGbAgEBBDAAAAAAAAAAAAAAAAAA
+use cert::*;
-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAShZANiAAQTglHNUqyS
-mMHIqtl3Mh3rl+cJvQtMoKylXcitUdz8nRWJoVl+OlEg4e/WMcY+GDXKyuKYaaYu
-FjHoooGBq1ZhbcRdkYq8CfOrDmPPeSqk3O1zh743u6VpVJ8cArJw7Wc=
------END PRIVATE KEY-----";
-
-const CA_CHAIN: &str = "-----BEGIN PRIVATE KEY-----
-MIG2AgEAMBAGByqGSM49AgEGBSuBBAAiBIGeMIGbAgEBBDAAAAAAAAAAAAAAAAAA
-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAShZANiAAQTglHNUqyS
-mMHIqtl3Mh3rl+cJvQtMoKylXcitUdz8nRWJoVl+OlEg4e/WMcY+GDXKyuKYaaYu
-FjHoooGBq1ZhbcRdkYq8CfOrDmPPeSqk3O1zh743u6VpVJ8cArJw7Wc=
------END PRIVATE KEY-----
------BEGIN CERTIFICATE-----
-MIIDaDCCAu6gAwIBAgIPKWkmwiejoVJjkrGUgqUEMAoGCCqGSM49BAMDMFYxCzAJ
-BgNVBAYTAklOMSUwIwYDVQQKDBxlTXVkaHJhIFRlY2hub2xvZ2llcyBMaW1pdGVk
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-4rSb9vGqxZzelQth
------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
-MIIDdDCCAvmgAwIBAgIQAJYaPvsTWVdu0EAFtGhKWzAKBggqhkjOPQQDAzBrMQsw
-CQYDVQQGEwJJTjETMBEGA1UECxMKZW1TaWduIFBLSTElMCMGA1UEChMcZU11ZGhy
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-1jJH3jGvCXC79LU9UPJ2o3TU+UIj2gMV
------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
-MIIDzzCCAregAwIBAgIRAI1aSBGTnvRH13ERzdmEmukwDQYJKoZIhvcNAQELBQAw
-ezELMAkGA1UEBhMCR0IxGzAZBgNVBAgMEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
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-uL5ChFWOQU+ErSDnUq7yr+pjBQ==
------END CERTIFICATE-----";
-
-/// 证书里要覆盖的域名。抓包目标 host 必须在这里面，否则 App 会报证书不受信任。
-const SAN: &[&str] = &[
-    // 国服
-    "*.dailygn.com",
-    // 日服
-    "production-game-api.sekai.colorfulpalette.org",
-    "*.sekai.colorfulpalette.org",
-    // 国际服
-    "n-production-game-api.sekai-en.com",
-    "*.sekai-en.com",
-    // 台服 / 韩服（cdn 和 https 两个域都会出现）
-    "*.bytedgame.com",
-    "mk-zian-obt-cdn.bytedgame.com",
-    "mk-zian-obt-https.bytedgame.com",
-    "mkkorea-obt-prod01-cdn.bytedgame.com",
-    "mkkorea-obt-prod01-https.bytedgame.com",
-];
 
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");
     let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
 
-    let ca_key = KeyPair::from_pem(CA_KEY).expect("parse CA key failed");
+    let (fullchain_pem, leaf_key_pem) = sign(SAN.iter());
-    let first_ca_pem = first_pem_certificate(CA_CHAIN);
-    let issuer = rcgen::Issuer::from_ca_cert_pem(&first_ca_pem, ca_key)
-        .expect("build Issuer from CA cert + key failed");
-
-    let mut leaf_params = CertificateParams::default();
-    let mut dn = DistinguishedName::new();
-    dn.push(DnType::CommonName, SAN[0]);
-    leaf_params.distinguished_name = dn;
-
-    leaf_params.subject_alt_names = SAN
-        .iter()
-        .map(|d| SanType::DnsName((*d).try_into().unwrap()))
-        .collect();
-
-    leaf_params.key_usages = vec![
-        KeyUsagePurpose::DigitalSignature,
-        KeyUsagePurpose::KeyEncipherment,
-    ];
-    leaf_params.extended_key_usages = vec![ExtendedKeyUsagePurpose::ServerAuth];
-    leaf_params.is_ca = IsCa::NoCa;
-    // AKI 必须和签发者证书里的 SKI 一致，rcgen 的 Issuer 会自动从 CA 证书里取
-    leaf_params.use_authority_key_identifier_extension = true;
-    // 有效期落在 CA 的有效期内（2025-04-30 ~ 2040-04-28）
-    leaf_params.not_before = rcgen::date_time_ymd(2025, 5, 1);
-    leaf_params.not_after = rcgen::date_time_ymd(2038, 1, 1);
-
-    let leaf_key = KeyPair::generate().expect("generate leaf key failed");
-    let leaf_cert = leaf_params
-        .signed_by(&leaf_key, &issuer)
-        .expect("sign leaf cert failed");
-
-    // leaf + 完整 CA 链（两个 G3C 交叉签名都带上，让验证器自己选路径）
-    let fullchain_pem = format!("{}{}", leaf_cert.pem(), CA_CHAIN);
     fs::write(out_dir.join("fullchain.pem"), fullchain_pem).unwrap();
-
-    let leaf_key_pem = leaf_key.serialize_pem();
     fs::write(out_dir.join("leaf.key"), leaf_key_pem).unwrap();
 }
-
-fn first_pem_certificate(pem: &str) -> String {
-    let begin = "-----BEGIN CERTIFICATE-----";
-    let end = "-----END CERTIFICATE-----";
-    if let (Some(s), Some(e)) = (pem.find(begin), pem.find(end)) {
-        pem[s..e + end.len()].to_string()
-    } else {
-        panic!("no certificate found in CA chain PEM");
-    }
-}

core_vpn/src/acceptor.rs

@@ -0,0 +1,40 @@
+use crate::cert::{check_cert_included, sign};
+use crate::info;
+use rustls_pemfile::{certs, private_key};
+use std::io::BufReader;
+use std::sync::Arc;
+
+pub fn build_tls_acceptor(target_hosts: Vec<String>) -> Arc<rustls::ServerConfig> {
+    let is_included_built_in = check_cert_included(target_hosts.iter().map(|s| s.as_str()));
+    let (cert_chain, key) = if is_included_built_in {
+        let fullchain = include_bytes!(concat!(env!("OUT_DIR"), "/fullchain.pem"));
+        let leaf_key = include_bytes!(concat!(env!("OUT_DIR"), "/leaf.key"));
+        let cert_chain = certs(&mut BufReader::new(&fullchain[..]))
+            .collect::<Result<Vec<_>, _>>()
+            .unwrap();
+        let key = private_key(&mut BufReader::new(&leaf_key[..]))
+            .unwrap()
+            .unwrap();
+        (cert_chain, key)
+    } else {
+        info!("Target hosts not match built-in cert, generating new cert");
+        let target = target_hosts.iter().map(|s| s.as_str()).collect::<Vec<_>>();
+        let (fullchain, leaf_key) = sign(target.iter());
+        let cert_chain = certs(&mut BufReader::new(fullchain.as_bytes()))
+            .collect::<Result<Vec<_>, _>>()
+            .unwrap();
+        let key = private_key(&mut BufReader::new(leaf_key.as_bytes()))
+            .unwrap()
+            .unwrap();
+        (cert_chain, key)
+    };
+
+    let mut config = rustls::ServerConfig::builder()
+        .with_no_client_auth()
+        .with_single_cert(cert_chain, key)
+        .unwrap();
+
+    config.alpn_protocols = vec![b"http/1.1".to_vec()];
+
+    Arc::new(config)
+}

core_vpn/src/cert.rs

@@ -1,24 +1,176 @@
-use rustls_pemfile::{certs, private_key};
+use rcgen::{
-use std::io::BufReader;
+    CertificateParams, DistinguishedName, DnType, ExtendedKeyUsagePurpose, IsCa, KeyPair,
-use std::sync::Arc;
+    KeyUsagePurpose, SanType,
+};
 
-pub fn build_tls_acceptor() -> Arc<rustls::ServerConfig> {
+const CA_KEY: &str = "-----BEGIN PRIVATE KEY-----
-    let fullchain = include_bytes!(concat!(env!("OUT_DIR"), "/fullchain.pem"));
+MIG2AgEAMBAGByqGSM49AgEGBSuBBAAiBIGeMIGbAgEBBDAAAAAAAAAAAAAAAAAA
-    let leaf_key = include_bytes!(concat!(env!("OUT_DIR"), "/leaf.key"));
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAShZANiAAQTglHNUqyS
+mMHIqtl3Mh3rl+cJvQtMoKylXcitUdz8nRWJoVl+OlEg4e/WMcY+GDXKyuKYaaYu
+FjHoooGBq1ZhbcRdkYq8CfOrDmPPeSqk3O1zh743u6VpVJ8cArJw7Wc=
+-----END PRIVATE KEY-----";
 
-    let cert_chain = certs(&mut BufReader::new(&fullchain[..]))
+const CA_CHAIN: &str = "-----BEGIN PRIVATE KEY-----
-        .collect::<Result<Vec<_>, _>>()
+MIG2AgEAMBAGByqGSM49AgEGBSuBBAAiBIGeMIGbAgEBBDAAAAAAAAAAAAAAAAAA
-        .unwrap();
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAShZANiAAQTglHNUqyS
-    let key = private_key(&mut BufReader::new(&leaf_key[..]))
+mMHIqtl3Mh3rl+cJvQtMoKylXcitUdz8nRWJoVl+OlEg4e/WMcY+GDXKyuKYaaYu
-        .unwrap()
+FjHoooGBq1ZhbcRdkYq8CfOrDmPPeSqk3O1zh743u6VpVJ8cArJw7Wc=
-        .unwrap();
+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+1jHGPhg1ysrimGmmLhYx6KKBgatWYW3EXZGKvAnzqw5jz3kqpNztc4e+N7ulaVSf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+-----END CERTIFICATE-----";
 
-    let mut config = rustls::ServerConfig::builder()
+pub const SAN: &[&str] = &[
-        .with_no_client_auth()
+    // 国服
-        .with_single_cert(cert_chain, key)
+    "*.dailygn.com",
-        .unwrap();
+    // 日服
+    "production-game-api.sekai.colorfulpalette.org",
+    "*.sekai.colorfulpalette.org",
+    // 国际服
+    "n-production-game-api.sekai-en.com",
+    "*.sekai-en.com",
+    // 台服 / 韩服（cdn 和 https 两个域都会出现）
+    "*.bytedgame.com",
+    "mk-zian-obt-cdn.bytedgame.com",
+    "mk-zian-obt-https.bytedgame.com",
+    "mkkorea-obt-prod01-cdn.bytedgame.com",
+    "mkkorea-obt-prod01-https.bytedgame.com",
+];
 
-    config.alpn_protocols = vec![b"http/1.1".to_vec()];
+#[allow(unused)] // caused in re-build in build.rs
-
+pub fn check_cert_included<'a>(target_hosts: impl Iterator<Item = &'a str>) -> bool {
-    Arc::new(config)
+    for host in target_hosts {
+        if SAN.contains(&host) {
+            continue;
+        }
+        let mut found = false;
+        for included_host in SAN {
+            if !included_host.starts_with("*.") {
+                continue;
+            }
+            let without_star = &included_host[2..];
+            let host_without_first = host.split_once(".");
+            if let Some(parts) = host_without_first
+                && parts.1 == without_star
+            {
+                found = true;
+                break;
+            }
+        }
+        if !found {
+            return false;
+        }
+    }
+    true
+}
+
+pub fn sign<'a>(target_hosts: impl Iterator<Item = &'a &'a str>) -> (String, String) {
+    let mut target_hosts = target_hosts.peekable();
+
+    let ca_key = KeyPair::from_pem(CA_KEY).expect("parse CA key failed");
+    let first_ca_pem = first_pem_certificate(CA_CHAIN);
+    let issuer = rcgen::Issuer::from_ca_cert_pem(&first_ca_pem, ca_key)
+        .expect("build Issuer from CA cert + key failed");
+
+    let mut leaf_params = CertificateParams::default();
+    let mut dn = DistinguishedName::new();
+    dn.push(DnType::CommonName, target_hosts.peek().unwrap().to_string());
+    leaf_params.distinguished_name = dn;
+
+    leaf_params.subject_alt_names = target_hosts
+        .map(|d| SanType::DnsName((*d).try_into().unwrap()))
+        .collect();
+
+    leaf_params.key_usages = vec![
+        KeyUsagePurpose::DigitalSignature,
+        KeyUsagePurpose::KeyEncipherment,
+    ];
+    leaf_params.extended_key_usages = vec![ExtendedKeyUsagePurpose::ServerAuth];
+    leaf_params.is_ca = IsCa::NoCa;
+    // AKI 必须和签发者证书里的 SKI 一致，rcgen 的 Issuer 会自动从 CA 证书里取
+    leaf_params.use_authority_key_identifier_extension = true;
+    // 有效期落在 CA 的有效期内（2025-04-30 ~ 2040-04-28）
+    leaf_params.not_before = rcgen::date_time_ymd(2025, 5, 1);
+    leaf_params.not_after = rcgen::date_time_ymd(2038, 1, 1);
+
+    let leaf_key = KeyPair::generate().expect("generate leaf key failed");
+    let leaf_cert = leaf_params
+        .signed_by(&leaf_key, &issuer)
+        .expect("sign leaf cert failed");
+
+    let fullchain_pem = format!("{}{}", leaf_cert.pem(), CA_CHAIN);
+    let leaf_key_pem = leaf_key.serialize_pem();
+    (fullchain_pem, leaf_key_pem)
+}
+
+fn first_pem_certificate(pem: &str) -> String {
+    let begin = "-----BEGIN CERTIFICATE-----";
+    let end = "-----END CERTIFICATE-----";
+    if let (Some(s), Some(e)) = (pem.find(begin), pem.find(end)) {
+        pem[s..e + end.len()].to_string()
+    } else {
+        panic!("no certificate found in CA chain PEM");
+    }
 }

core_vpn/src/lib.rs

@@ -2,6 +2,7 @@ mod cert;
 mod mitm;
 mod mut_qstring;
 mod tun;
+mod acceptor;
 
 use crate::mitm::{ProxyConfig, StepSpec, Waiter, Waiters, run_session};
 use jni::objects::{Global, JClass, JObject, JString};

core_vpn/src/mitm.rs

@@ -1,8 +1,8 @@
-use crate::cert::build_tls_acceptor;
 use crate::mut_qstring::MutQString;
 use crate::tun::{BorrowedTunIo, RewindStream};
 use crate::{error, info, warn};
 use bytes::Bytes;
+use http::Uri;
 use http_body_util::{BodyExt, Full};
 use hyper::body::Incoming;
 use hyper_util::rt::TokioIo;
@@ -14,13 +14,13 @@ use std::net::SocketAddr;
 use std::os::fd::RawFd;
 use std::sync::{Arc, Mutex as StdMutex, OnceLock};
 use std::time::Duration;
-use http::Uri;
 use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
 use tokio::net::UdpSocket;
 use tokio::task::JoinSet;
 use tokio_rustls::StartHandshake;
 use tokio_util::sync::CancellationToken;
 use tun_rs::BorrowedAsyncDevice;
+use crate::acceptor::build_tls_acceptor;
 
 static ROOT_STORE: OnceLock<Arc<RootCertStore>> = OnceLock::new();
 
@@ -145,13 +145,12 @@ where
         return passthrough_cancel_wrapped(io, dst, None, upstream, &cancel).await;
     };
 
-    // 崩溃上报之类的域名直接拒绝，不建立上游连接
+    if let Some(host) = sni.as_deref()
-    if let Some(host) = sni.as_deref() {
+        && is_blocked_host(host)
-        if is_blocked_host(host) {
+    {
         warn!("blocked host {host} ({dst:?}), connection rejected");
         return Ok(());
     }
-    }
 
     let host_matched = sni
         .as_deref()
@@ -382,7 +381,6 @@ fn force_full_mysekai(uri: &Uri) -> Option<Uri> {
     Uri::try_from(format!("{}?{}", uri.path(), query).as_str()).ok()
 }
 
-
 #[derive(serde::Deserialize, Debug, Clone)]
 pub struct StepSpec {
     pub id: String,
@@ -450,9 +448,16 @@ impl ProxyConfig {
             None
         } else {
             let pass = url.password().unwrap_or("");
-            Some(base64_encode(format!("{}:{}", url.username(), pass).as_bytes()))
+            Some(base64_encode(
+                format!("{}:{}", url.username(), pass).as_bytes(),
+            ))
         };
-        Ok(Some(Self { tls, host, port, auth }))
+        Ok(Some(Self {
+            tls,
+            host,
+            port,
+            auth,
+        }))
     }
 }
 
@@ -473,7 +478,9 @@ struct Upstream {
 
 impl Upstream {
     fn new(proxy: Option<ProxyConfig>) -> Self {
-        Self { proxy: proxy.map(Arc::new) }
+        Self {
+            proxy: proxy.map(Arc::new),
+        }
     }
 
     async fn connect(&self, dst: SocketAddr, host: Option<&str>) -> anyhow::Result<UpstreamIo> {
@@ -571,7 +578,7 @@ pub async fn run_session(
     let mut ip_stack = ipstack::IpStack::new(ipstack_config, tun_io);
     let mut bridge_tasks = JoinSet::new();
 
-    let tls_acceptor = build_tls_acceptor();
+    let tls_acceptor = build_tls_acceptor(target_hosts.clone());
     let upstream = Upstream::new(proxy);
 
     loop {