···
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Test suite for curl-impersonate
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Uses the test suite from the curl-impersonate source repo which:
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1. Performs requests with libcurl and captures the TLS client-hello
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packets with tcpdump to compare against known-good signatures
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2. Spins up an nghttpd2 server to test client HTTP/2 headers against
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See https://github.com/lwthiker/curl-impersonate/tree/main/tests/signatures
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- We need to have our own web server running because the tests expect to be able
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to hit domains like wikipedia.org and the sandbox has no internet
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- We need to be able to do (verifying) TLS handshakes without internet access.
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We do that by creating a trusted CA and issuing a cert that includes
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all of the test domains as subject-alternative names and then spoofs the
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hostnames in /etc/hosts.
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import ./make-test-python.nix ({ pkgs, lib, ... }: let
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# Update with domains in TestImpersonate.TEST_URLS if needed from:
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# https://github.com/lwthiker/curl-impersonate/blob/main/tests/test_impersonate.py
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# Configure CA with X.509 v3 extensions that would be trusted by curl
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ca-cert-conf = pkgs.writeText "curl-impersonate-ca.cnf" ''
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basicConstraints = critical, CA:TRUE
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subjectKeyIdentifier = hash
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authorityKeyIdentifier = keyid:always, issuer:always
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keyUsage = critical, cRLSign, digitalSignature, keyCertSign
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# Configure leaf certificate with X.509 v3 extensions that would be trusted
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# by curl and set subject-alternative names for test domains
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tls-cert-conf = pkgs.writeText "curl-impersonate-tls.cnf" ''
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basicConstraints = critical, CA:FALSE
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subjectKeyIdentifier = hash
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authorityKeyIdentifier = keyid:always, issuer:always
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keyUsage = critical, nonRepudiation, digitalSignature, keyEncipherment, keyAgreement
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extendedKeyUsage = critical, serverAuth
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subjectAltName = @alt_names
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${lib.concatStringsSep "\n" (lib.imap0 (idx: domain: "DNS.${toString idx} = ${domain}") domains)}
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in pkgs.runCommand "curl-impersonate-test-certs" {
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nativeBuildInputs = [ pkgs.openssl ];
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# create CA certificate and key
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openssl req -newkey rsa:4096 -keyout ca-key.pem -out ca-csr.pem -nodes -subj '/CN=curl-impersonate-ca.nixos.test'
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openssl x509 -req -sha512 -in ca-csr.pem -key ca-key.pem -out ca.pem -extfile ${ca-cert-conf} -days 36500
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openssl x509 -in ca.pem -text
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# create server certificate and key
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openssl req -newkey rsa:4096 -keyout key.pem -out csr.pem -nodes -subj '/CN=curl-impersonate.nixos.test'
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openssl x509 -req -sha512 -in csr.pem -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out cert.pem -extfile ${tls-cert-conf} -days 36500
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openssl x509 -in cert.pem -text
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# output CA cert and server cert and key
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cp key.pem cert.pem ca.pem $out
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curl-impersonate-test = let
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# Build miniature libcurl client used by test driver
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minicurl = pkgs.runCommandCC "minicurl" {
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buildInputs = [ pkgs.curl ];
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$CC -Wall -Werror -o $out/bin/minicurl ${pkgs.curl-impersonate.src}/tests/minicurl.c `curl-config --libs`
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in pkgs.writeShellScript "curl-impersonate-test" ''
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# Test driver requirements
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export PATH="${with pkgs; lib.makeBinPath [
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export PYTHONPATH="${with pkgs.python3Packages; makePythonPath [
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# Prepare test root prefix
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cp -rs ${pkgs.curl-impersonate}/* ${minicurl}/* usr/
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cp -r ${pkgs.curl-impersonate.src}/tests ./
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pytest . --install-dir ../usr --capture-interface eth1
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name = "curl-impersonate";
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meta = with lib.maintainers; {
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maintainers = [ lilyinstarlight ];
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web = { nodes, pkgs, lib, config, ... }: {
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networking.firewall.allowedTCPPorts = [ 80 443 ];
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virtualHosts."curl-impersonate.nixos.test" = {
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sslCertificate = "${tls-certs}/cert.pem";
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sslCertificateKey = "${tls-certs}/key.pem";
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curl = { nodes, pkgs, lib, config, ... }: {
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networking.extraHosts = lib.concatStringsSep "\n" (map (domain: "${nodes.web.networking.primaryIPAddress} ${domain}") domains);
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security.pki.certificateFiles = [ "${tls-certs}/ca.pem" ];
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testScript = { nodes, ... }: ''
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with subtest("Wait for network"):
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web.wait_for_unit("network-online.target")
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curl.wait_for_unit("network-online.target")
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with subtest("Wait for web server"):
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web.wait_for_unit("nginx.service")
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web.wait_for_open_port(443)
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with subtest("Run curl-impersonate tests"):
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curl.succeed("${curl-impersonate-test}")