feat: improve client certificate authentication

.vscode/settings.json

@@ -1,6 +1,7 @@
 {
     "cSpell.words": [
         "authcookie",
+        "badssl",
         "bincode",
         "chacha",
         "clientos",

README.md

@@ -13,6 +13,7 @@ A GUI for GlobalProtect VPN, based on OpenConnect, supports the SSO authenticati
 - [x] Support both SSO and non-SSO authentication
 - [x] Support the FIDO2 authentication (e.g., YubiKey)
 - [x] Support authentication using default browser
+- [x] Support client certificate authentication
 - [x] Support multiple portals
 - [x] Support gateway selection
 - [x] Support connect gateway directly
@@ -74,7 +75,7 @@ sudo apt-get install globalprotect-openconnect
 >
 > For Linux Mint, you might need to import the GPG key with: `sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7937C393082992E5D6E4A60453FC26B43838D761` if you encountered an error `gpg: keyserver receive failed: General error`.
 
-#### **Ubuntu 24.04**
+#### **Ubuntu 24.04 and later**
 
 The `libwebkit2gtk-4.0-37` package was [removed](https://bugs.launchpad.net/ubuntu/+source/webkit2gtk/+bug/2061914) from its repo, before [the issue](https://github.com/yuezk/GlobalProtect-openconnect/issues/351) gets resolved, you need to install them manually:
 

apps/gpclient/src/connect.rs

@@ -42,9 +42,13 @@ pub(crate) struct ConnectArgs {
   )]
   hip: bool,
 
-  #[arg(short, long, help = "Use SSL client certificate file (.pem or .p12)")]
+  #[arg(
+    short,
+    long,
+    help = "Use SSL client certificate file in pkcs#8 (.pem) or pkcs#12 (.p12, .pfx) format"
+  )]
   certificate: Option<String>,
-  #[arg(short = 'k', long, help = "Use SSL private key file (.pem)")]
+  #[arg(short = 'k', long, help = "Use SSL private key file in pkcs#8 (.pem) format")]
   sslkey: Option<String>,
   #[arg(short = 'p', long, help = "The key passphrase of the private key")]
   key_password: Option<String>,
@@ -122,7 +126,7 @@ impl<'a> ConnectHandler<'a> {
 
     loop {
       let Err(err) = self.handle_impl().await else {
-        return Ok(())
+        return Ok(());
       };
 
       let Some(root_cause) = err.root_cause().downcast_ref::<RequestIdentityError>() else {
@@ -133,7 +137,7 @@ impl<'a> ConnectHandler<'a> {
         RequestIdentityError::NoKey => {
           eprintln!("ERROR: No private key found in the certificate file");
           eprintln!("ERROR: Please provide the private key file using the `-k` option");
-          return Ok(())
+          return Ok(());
         }
         RequestIdentityError::NoPassphrase(cert_type) | RequestIdentityError::DecryptError(cert_type) => {
           // Decrypt the private key error, ask for the key password

crates/gpapi/src/gp_params.rs

@@ -1,13 +1,11 @@
 use std::collections::HashMap;
 
+use log::info;
 use reqwest::Client;
 use serde::{Deserialize, Serialize};
 use specta::Type;
 
-use crate::{
-  utils::request::{create_identity_from_pem, create_identity_from_pkcs12},
-  GP_USER_AGENT,
-};
+use crate::{utils::request::create_identity, GP_USER_AGENT};
 
 #[derive(Debug, Serialize, Deserialize, Clone, Type, Default)]
 pub enum ClientOs {
@@ -255,12 +253,8 @@ impl TryFrom<&GpParams> for Client {
       .user_agent(&value.user_agent);
 
     if let Some(cert) = value.certificate.as_deref() {
-      // .p12 or .pfx file
-      let identity = if cert.ends_with(".p12") || cert.ends_with(".pfx") {
-        create_identity_from_pkcs12(cert, value.key_password.as_deref())?
-      } else {
-        create_identity_from_pem(cert, value.sslkey.as_deref(), value.key_password.as_deref())?
-      };
+      info!("Using client certificate authentication...");
+      let identity = create_identity(cert, value.sslkey.as_deref(), value.key_password.as_deref())?;
       builder = builder.identity(identity);
     }
 

crates/gpapi/src/utils/request.rs

@@ -1,4 +1,4 @@
-use std::fs;
+use std::{borrow::Cow, fs};
 
 use anyhow::bail;
 use log::warn;
@@ -17,24 +17,31 @@ pub enum RequestIdentityError {
 }
 
 /// Create an identity object from a certificate and key
-pub fn create_identity_from_pem(cert: &str, key: Option<&str>, passphrase: Option<&str>) -> anyhow::Result<Identity> {
+/// The file is expected to be the PKCS#8 PEM or PKCS#12 format
+/// When using a PKCS#12 file, the key is NOT required, but a passphrase is required
+pub fn create_identity(cert: &str, key: Option<&str>, passphrase: Option<&str>) -> anyhow::Result<Identity> {
+  if cert.ends_with(".p12") || cert.ends_with(".pfx") {
+    create_identity_from_pkcs12(cert, passphrase)
+  } else {
+    create_identity_from_pem(cert, key, passphrase)
+  }
+}
+
+fn create_identity_from_pem(cert: &str, key: Option<&str>, passphrase: Option<&str>) -> anyhow::Result<Identity> {
   let cert_pem = fs::read(cert).map_err(|err| anyhow::anyhow!("Failed to read certificate file: {}", err))?;
 
-  // Get the private key pem
-  let key_pem = match key {
-    Some(key) => {
-      let pem_file = fs::read(key).map_err(|err| anyhow::anyhow!("Failed to read key file: {}", err))?;
-      pem::parse(pem_file)?
-    }
-    None => {
-      // If key is not provided, find the private key in the cert pem
-      parse_many(&cert_pem)?
-        .into_iter()
-        .find(|pem| pem.tag().ends_with("PRIVATE KEY"))
-        .ok_or(RequestIdentityError::NoKey)?
-    }
+  // Use the certificate as the key if no key is provided
+  let key_pem_file = match key {
+    Some(key) => Cow::Owned(fs::read(key).map_err(|err| anyhow::anyhow!("Failed to read key file: {}", err))?),
+    None => Cow::Borrowed(&cert_pem),
   };
 
+  // Find the private key in the pem file
+  let key_pem = parse_many(key_pem_file.as_ref())?
+    .into_iter()
+    .find(|pem| pem.tag().ends_with("PRIVATE KEY"))
+    .ok_or(RequestIdentityError::NoKey)?;
+
   // The key pem could be encrypted, so we need to decrypt it
   let decrypted_key_pem = if key_pem.tag().ends_with("ENCRYPTED PRIVATE KEY") {
     let passphrase = passphrase.ok_or_else(|| {
@@ -56,7 +63,7 @@ pub fn create_identity_from_pem(cert: &str, key: Option<&str>, passphrase: Optio
   Ok(identity)
 }
 
-pub fn create_identity_from_pkcs12(pkcs12: &str, passphrase: Option<&str>) -> anyhow::Result<Identity> {
+fn create_identity_from_pkcs12(pkcs12: &str, passphrase: Option<&str>) -> anyhow::Result<Identity> {
   let pkcs12 = fs::read(pkcs12)?;
 
   let Some(passphrase) = passphrase else {
@@ -89,4 +96,45 @@ mod tests {
 
     assert!(identity.is_ok());
   }
+
+  #[test]
+  fn create_identity_from_pem_unencrypted_key() {
+    let cert = "tests/files/badssl.com-client-unencrypted.pem";
+    let identity = create_identity_from_pem(cert, None, None);
+    println!("{:?}", identity);
+
+    assert!(identity.is_ok());
+  }
+
+  #[test]
+  fn create_identity_from_pem_cert_and_encrypted_key() {
+    let cert = "tests/files/badssl.com-client.pem";
+    let key = "tests/files/badssl.com-client.pem";
+    let passphrase = "badssl.com";
+
+    let identity = create_identity_from_pem(cert, Some(key), Some(passphrase));
+
+    assert!(identity.is_ok());
+  }
+
+  #[test]
+  fn create_identity_from_pem_cert_and_encrypted_key_no_passphrase() {
+    let cert = "tests/files/badssl.com-client.pem";
+    let key = "tests/files/badssl.com-client.pem";
+
+    let identity = create_identity_from_pem(cert, Some(key), None);
+
+    assert!(identity.is_err());
+    assert!(identity.unwrap_err().to_string().contains("No passphrase provided"));
+  }
+
+  #[test]
+  fn create_identity_from_pem_cert_and_unencrypted_key() {
+    let cert = "tests/files/badssl.com-client.pem";
+    let key = "tests/files/badssl.com-client-unencrypted.pem";
+
+    let identity = create_identity_from_pem(cert, Some(key), None);
+
+    assert!(identity.is_ok());
+  }
 }

crates/gpapi/tests/files/badssl.com-client-unencrypted.pem

@@ -0,0 +1,62 @@
+Bag Attributes
+    localKeyID: AE DC 75 2E 97 28 71 D8 1E 9A 7F 1E 5A AA F4 2E D3 6D 2C 8B
+subject=/C=US/ST=California/L=San Francisco/O=BadSSL/CN=BadSSL Client Certificate
+issuer=/C=US/ST=California/L=San Francisco/O=BadSSL/CN=BadSSL Client Root Certificate Authority
+-----BEGIN CERTIFICATE-----
+MIIEnTCCAoWgAwIBAgIJAPfJjkenM2ooMA0GCSqGSIb3DQEBCwUAMH4xCzAJBgNV
+BAYTAlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1TYW4gRnJhbmNp
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+/syiAWDsYzFuq2Ntv2ljTYPEPwXEIQcpsagDRL6WzoLR
+-----END CERTIFICATE-----
+Bag Attributes
+    localKeyID: AE DC 75 2E 97 28 71 D8 1E 9A 7F 1E 5A AA F4 2E D3 6D 2C 8B
+Key Attributes: <No Attributes>
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDHN18R6x5Oz+u6
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+GTH3fhaM/pZZGdIC75x/69Y=
+-----END PRIVATE KEY-----