curl-impersonate/curl-lib-nss.patch

--- curl-7.81.0-original/lib/vtls/nss.c	2022-01-03 18:36:46.000000000 +0200
+++ curl-7.81.0/lib/vtls/nss.c	2022-02-17 10:33:28.567798277 +0200
@@ -380,2 +380,91 @@
 
+/* See nsSSLIOLayerSetOptions@nsNSSIOLayer.cpp, Firefox source code */
+const SSLNamedGroup named_groups[] = {
+  ssl_grp_ec_curve25519, ssl_grp_ec_secp256r1, ssl_grp_ec_secp384r1,
+  ssl_grp_ec_secp521r1,  ssl_grp_ffdhe_2048,   ssl_grp_ffdhe_3072};
+
+#define NUM_OF_NAMED_GROUPS sizeof(named_groups)/sizeof(named_groups[0])
+
+static SECStatus set_named_groups(PRFileDesc *model)
+{
+  /* This aligns TLS extension 10 (supported_groups) to what Firefox does. */
+  return SSL_NamedGroupConfig(model, named_groups, NUM_OF_NAMED_GROUPS);
+}
+
+static const SSLSignatureScheme signatures[] = {
+    ssl_sig_ecdsa_secp256r1_sha256, ssl_sig_ecdsa_secp384r1_sha384,
+    ssl_sig_ecdsa_secp521r1_sha512, ssl_sig_rsa_pss_sha256,
+    ssl_sig_rsa_pss_sha384,         ssl_sig_rsa_pss_sha512,
+    ssl_sig_rsa_pkcs1_sha256,       ssl_sig_rsa_pkcs1_sha384,
+    ssl_sig_rsa_pkcs1_sha512,       ssl_sig_ecdsa_sha1,
+    ssl_sig_rsa_pkcs1_sha1
+};
+
+#define NUM_OF_SIGNATURES sizeof(signatures)/sizeof(signatures[0])
+
+static SECStatus set_additional_key_shares(PRFileDesc *model)
+{
+  /* This aligns TLS extension 51 (key_share) to what Firefox does. */
+  return SSL_SendAdditionalKeyShares(model, 1);
+}
+
+static SECStatus set_signatures(PRFileDesc *model)
+{
+  /* Align TLS extension 13 (signature_algorithms) to what Firefox does. */
+  return SSL_SignatureSchemePrefSet(model, signatures, NUM_OF_SIGNATURES);
+}
+
+static SECStatus set_ssl_options(PRFileDesc *model)
+{
+  SECStatus s;
+
+  /* Enable TLS 1.3 compat mode. Firefox does this, as can be seen at
+   * nsSSLIOLayerSetOptions()@nsNSSIOLayer.cpp.
+   * This has the side effect of NSS faking a TLS session ID.
+   * See ssl3_CreateClientHelloPreamble()@ssl3con.c
+   */
+  s = SSL_OptionSet(model, SSL_ENABLE_TLS13_COMPAT_MODE, PR_TRUE);
+  if (s != SECSuccess) {
+      return s;
+  }
+
+  /* Firefox sets the following options. I don't know what they do. */
+  s = SSL_OptionSet(model, SSL_REQUIRE_SAFE_NEGOTIATION, false);
+  if (s != SECSuccess) {
+      return s;
+  }
+  s = SSL_OptionSet(model, SSL_ENABLE_EXTENDED_MASTER_SECRET, true);
+  if (s != SECSuccess) {
+      return s;
+  }
+  s = SSL_OptionSet(model, SSL_ENABLE_HELLO_DOWNGRADE_CHECK, true);
+  if (s != SECSuccess) {
+      return s;
+  }
+  s = SSL_OptionSet(model, SSL_ENABLE_0RTT_DATA, true);
+  if (s != SECSuccess) {
+      return s;
+  }
+
+  /* This adds TLS extension 34 to the Client Hello. */
+  s = SSL_OptionSet(model, SSL_ENABLE_DELEGATED_CREDENTIALS, true);
+  if (s != SECSuccess) {
+      return s;
+  }
+
+  /* This adds TLS extension 5 (status_request) to the Client Hello. */
+  s = SSL_OptionSet(model, SSL_ENABLE_OCSP_STAPLING, true);
+  if (s != SECSuccess) {
+      return s;
+  }
+
+  /* Remove TLS extension 18 (signed_certificate_timestamp) */
+  s = SSL_OptionSet(model, SSL_ENABLE_SIGNED_CERT_TIMESTAMPS, false);
+  if (s != SECSuccess) {
+      return s;
+  }
+
+  return SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, true);
+}
+
 /*
@@ -1322,2 +1411,20 @@
     SECMOD_DestroyModule(module);
+
+  /* Patch for Ubuntu - add a "nss/" suffix to the library name */
+  config_string = aprintf("library=/usr/lib/x86_64-linux-gnu/nss/%s name=%s", library, name);
+  if(!config_string)
+    return CURLE_OUT_OF_MEMORY;
+
+  module = SECMOD_LoadUserModule(config_string, NULL, PR_FALSE);
+  free(config_string);
+
+  if(module && module->loaded) {
+    /* loaded successfully */
+    *pmod = module;
+    return CURLE_OK;
+  }
+
+  if(module)
+    SECMOD_DestroyModule(module);
+
   return CURLE_FAILED_INIT;
@@ -1923,2 +2030,8 @@
 
+  if(SSL_SET_OPTION(primary.sessionid)) {
+    if(SSL_OptionSet(model, SSL_ENABLE_SESSION_TICKETS,
+                     PR_TRUE) != SECSuccess)
+      goto error;
+  }
+
   /* enable/disable the requested SSL version(s) */
@@ -1962,2 +2075,10 @@
 
+  if (set_named_groups(model) != SECSuccess ||
+      set_additional_key_shares(model) != SECSuccess ||
+      set_signatures(model) != SECSuccess ||
+      set_ssl_options(model) != SECSuccess) {
+      result = CURLE_SSL_CIPHER;
+      goto error;
+  }
+
   if(!SSL_CONN_CONFIG(verifypeer) && SSL_CONN_CONFIG(verifyhost))
@@ -2115,2 +2236,6 @@
 
+    protocols[cur++] = ALPN_HTTP_1_1_LENGTH;
+    memcpy(&protocols[cur], ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH);
+    cur += ALPN_HTTP_1_1_LENGTH;
+
 #ifdef USE_HTTP2
@@ -2126,5 +2251,2 @@
 #endif
-    protocols[cur++] = ALPN_HTTP_1_1_LENGTH;
-    memcpy(&protocols[cur], ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH);
-    cur += ALPN_HTTP_1_1_LENGTH;