ssl: increase default RSA key size to 2048 bits

since 1024 is already deprecated by OpenSSL and causes "too small key" issues on systems enforcing a minimum size. Similar issue here: nodejs/node#44498 The minimum key size is not yet changed from 1024, this will require more effort for deprecation. BUG=webrtc:364338811 Change-Id: Id4b24a2c289ec5e3f112288d32b8ac697ba1cfed Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/361128 Reviewed-by: David Benjamin <davidben@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Philipp Hancke <phancke@meta.com> Cr-Commit-Position: refs/heads/main@{#43110}
maitrungduc1410 · Sep 30, 2024 · d79a185 · d79a185
1 parent a6fbb35
commit d79a185
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Showing 5 changed files with 137 additions and 93 deletions.
diff --git a/rtc_base/boringssl_identity.cc b/rtc_base/boringssl_identity.cc
@@ -129,6 +129,7 @@ std::unique_ptr<SSLIdentity> BoringSSLIdentity::CreateFromPEMChainStrings(
       uint32_t err = ERR_peek_error();
       if (ERR_GET_LIB(err) == ERR_LIB_PEM &&
           ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {
+        err = ERR_get_error();
         break;
       }
       RTC_LOG(LS_ERROR) << "Failed to parse certificate from PEM string.";

diff --git a/rtc_base/openssl_identity.cc b/rtc_base/openssl_identity.cc
@@ -128,6 +128,7 @@ std::unique_ptr<SSLIdentity> OpenSSLIdentity::CreateFromPEMChainStrings(
       uint32_t err = ERR_peek_error();
       if (ERR_GET_LIB(err) == ERR_LIB_PEM &&
           ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {
+        err = ERR_get_error();
         break;
       }
       RTC_LOG(LS_ERROR) << "Failed to parse certificate from PEM string: "

diff --git a/rtc_base/openssl_stream_adapter.cc b/rtc_base/openssl_stream_adapter.cc
@@ -1131,8 +1131,10 @@ static const cipher_list OK_RSA_ciphers[] = {
 #ifdef TLS1_CK_ECDHE_RSA_WITH_AES_256_GCM_SHA256
     CDEF(ECDHE_RSA_WITH_AES_256_GCM_SHA256),
 #endif
-#ifdef TLS1_CK_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
+#ifdef TLS1_CK_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256  // BoringSSL.
     CDEF(ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256),
+#elif defined(TLS1_RFC_ECDHE_ECDSA_WITH_CHACHA20_POLY1305)  // OpenSSL.
+    CDEF(ECDHE_RSA_WITH_CHACHA20_POLY1305),
 #endif
 };
 
@@ -1143,8 +1145,10 @@ static const cipher_list OK_ECDSA_ciphers[] = {
 #ifdef TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA256
     CDEF(ECDHE_ECDSA_WITH_AES_256_GCM_SHA256),
 #endif
-#ifdef TLS1_CK_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
+#ifdef TLS1_CK_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256  // BoringSSL.
     CDEF(ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256),
+#elif defined(TLS1_CK_ECDHE_ECDSA_WITH_CHACHA20_POLY1305)  // OpenSSL.
+    CDEF(ECDHE_ECDSA_WITH_CHACHA20_POLY1305),
 #endif
 };
 #undef CDEF

diff --git a/rtc_base/ssl_identity.h b/rtc_base/ssl_identity.h
@@ -32,8 +32,9 @@ class SSLCertificate;
 // KT_DEFAULT is used as the default KeyType for KeyParams.
 enum KeyType { KT_RSA, KT_ECDSA, KT_LAST, KT_DEFAULT = KT_ECDSA };
 
-static const int kRsaDefaultModSize = 1024;
+static const int kRsaDefaultModSize = 2048;
 static const int kRsaDefaultExponent = 0x10001;  // = 2^16+1 = 65537
+// TODO(bugs.webrtc.org/364338811): raise the bar to 2048 bits.
 static const int kRsaMinModSize = 1024;
 static const int kRsaMaxModSize = 8192;
 

diff --git a/rtc_base/ssl_stream_adapter_unittest.cc b/rtc_base/ssl_stream_adapter_unittest.cc
@@ -62,103 +62,134 @@ static int kExporterContextLen = sizeof(kExporterContext);
 
 // A private key used for testing, broken into pieces in order to avoid
 // issues with Git's checks for private keys in repos.
+// Generated using `openssl genrsa -out key.pem 2048`
 #define RSA_PRIVATE_KEY_HEADER "-----BEGIN RSA PRIVATE KEY-----\n"
 
 static const char kRSA_PRIVATE_KEY_PEM[] = RSA_PRIVATE_KEY_HEADER
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-    "UCXiYxSsu20QNVw=\n"
+    "MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQC4XOJ6agj673j+\n"
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+    "G8UmI9IUYic+xgS0IADJIYFx99bVmjLi7zshQAHVemn15v9GcBTCA7uojxX+FLmR\n"
+    "i8nuqUcTqGemE6PaQiX9MahgHU7NJ/gLs9dEeX4tD+8KVkrH/RRbg43eEATkRo8D\n"
+    "bO3JZ6MBwVNL6BU4hr+BViXEkHqBa9adoImIWHaLGQKBgQC4zlmHrDm9Ftb6fgsc\n"
+    "KXbEphPF/fuw4FJrPXP+0kRvF8AGbGqesBksX/JJCo46jfehNNGHmKFZ7oKMsHbS\n"
+    "yZp1/YZlg020ZLJkJz4GGPF1HgaxdV1L6TvIlofKWKKUEyi3RpMhq6w8hb/+mz/C\n"
+    "KverTah0EkZjZWwSZa4lQjwCaQKBgQD/YtL6WXiduF94pfVz7MmEoBa00C0rPFaC\n"
+    "5TOMVH+W2RbcGyVoPoLmwf1H2lN9v+wzaTRaPeHWs5MwQ4HDUbACXtGQ+I+6VNvo\n"
+    "iEo23jIK0hYzFgRGSMK7E0Uj8oBuPdJjkpCM4qqr0p8UHrktUOD8kB3DjdJrbqLm\n"
+    "q+9qAWzAvQKBgQCGR5EwDojphuXvnpPuA4bDvjSR4Uj3LRdVypI07o1A903UnQQf\n"
+    "h67S2mhOgDf1/d+XJ6yzTMi4cqAzH6lG4au03eDAc9aLI7unIAhmH8uaIJYWbUO7\n"
+    "+50v04iZEywWUZF9Ee+oQHfmhfyKQD3klJnew4+Jvxmb8T7EY1NUyTqXOQKBgQDM\n"
+    "EpsGZBJm7dqUXQE7Zh5NtWMPjz5YyzlSFXbQjwD5eHW04phMqY8OeDs9fG+1D3Te\n"
+    "TBYCemqJlytpqLf7bL4Z1szdbFHlkkO7l5S+LWWNkf0dS12VEDVTKf3Y0MHh1dLV\n"
+    "sFuDyOiaro5hlH9if7uY9kxiZGSdZmYTr5Z7fbH6fQKBgF+NKzivaJKz0a7ZCFhR\n"
+    "UfjvWrldeRzvyOiq+6nohTy3WNUZ+jSjwXZ7B4HGbHeaTBbsaNeO7aPGNe+Rt3Sr\n"
+    "rj6EzpBKk60ukkg49c+X/Rski/RmRosovJv4YUHtafafjAzeMhfU/tdKvjM00p9x\n"
+    "yf5MmWCNPsPfGsRZJpnYGvg3\n"
     "-----END RSA PRIVATE KEY-----\n";
-
 #undef RSA_PRIVATE_KEY_HEADER
 
+// Generated using
+// `openssl req -new -x509 -key key.pem -out cert.pem -days 365`
+// after setting the machine date to something that will ensure the
+// certificate is expired.
 static const char kCERT_PEM[] =
     "-----BEGIN CERTIFICATE-----\n"
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-    "UD0A8qfhfDM+LK6rPAnCsVN0NRDY3jvd6rzix9M=\n"
+    "MIIDjTCCAnWgAwIBAgIUTkCy4o8+4W/86RYmgWc8FEhWTzYwDQYJKoZIhvcNAQEL\n"
+    "BQAwVjELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM\n"
+    "GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2ViUlRDMB4XDTI0\n"
+    "MDkwMzAwNTk0NloXDTI1MDkwMzAwNTk0NlowVjELMAkGA1UEBhMCQVUxEzARBgNV\n"
+    "BAgMClNvbWUtU3RhdGUxITAfBgNVBAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0\n"
+    "ZDEPMA0GA1UEAwwGV2ViUlRDMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC\n"
+    "AQEAuFziemoI+u94/jvLBJz5oVZIwznfOfLIQGtO5FXXkXj5RPsFOBlE2NIuSXVx\n"
+    "fHFEC00nSn6rEe3/C47cYXoWZO/jkLOT9VbEkHqLa9i9FhQTUGfnErMCwR7eA4xv\n"
+    "b8gyTBC8D2JCzvxGcENRwYK0kh1BxPZkWpNiUM8RKnZ49rLFLPivZE5GC586vOnT\n"
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+    "bxQYQXuymHr5oqIbGSNZaDiK1ZDwui6fywiUjQUgFipC4Gt3EvpEv8b/M9G4Kr3d\n"
+    "ET1loApfl6dMRyRym8HydsF4rWs/KmUMpHEcgQzz6ehsX5kqQtStdsAxtTE2QkoY\n"
+    "5YbQgTKQ0yrwsagKX8pWv0UmXQASJUa26h5H9YpNNfwHy5PZvQya0719qFd8r2EH\n"
+    "JW67EJElwG5qE2N8DStPUjvVsydfbJflvRBjnf9IRuY9rGogeIOTkkkHAOyNWj3V\n"
+    "3tZ0r8lKDpUSH6Z5fALuwfEQsWj1qZkZn2ysv1GzEJS2jhS/xPfzOqs8eLVi91lx\n"
+    "1A==\n"
     "-----END CERTIFICATE-----\n";
 
+// Google GTS CA 1C3 certificate. Obtained from https://www.webrtc.org
 static const char kIntCert1[] =
     "-----BEGIN CERTIFICATE-----\n"
-    "MIIEUjCCAjqgAwIBAgIBAjANBgkqhkiG9w0BAQsFADCBljELMAkGA1UEBhMCVVMx\n"
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+    "AJ2xDx8hcFH1mt0G/FX0Kw4zd8NLQsLxdxP8c4CU6x+7Nz/OAipmsHMdMqUybDKw\n"
+    "juDEI/9bfU1lcKwrmz3O2+BtjjKAvpafkmO8l7tdufThcV4q5O8DIrGKZTqPwJNl\n"
+    "1IXNDw9bg1kWRxYtnCQ6yICmJhSFm/Y3m6xv+cXDBlHz4n/FsRC6UfTd\n"
     "-----END CERTIFICATE-----\n";
 
+// Google GTS Root R1 certificate. Obtained from https://www.webrtc.org
 static const char kCACert[] =
     "-----BEGIN CERTIFICATE-----\n"
-    "MIIGETCCA/mgAwIBAgIJAKN9r/BdbGUJMA0GCSqGSIb3DQEBCwUAMIGWMQswCQYD\n"
-    "VQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4g\n"
-    "VmlldzEUMBIGA1UECgwLR29vZ2xlLCBJbmMxDDAKBgNVBAsMA0dUUDEXMBUGA1UE\n"
-    "AwwOdGVsZXBob255Lmdvb2cxHTAbBgkqhkiG9w0BCQEWDmd0cEBnb29nbGUuY29t\n"
-    "MB4XDTE3MDcyNzIzMDE0NVoXDTE3MDgyNjIzMDE0NVowgZYxCzAJBgNVBAYTAlVT\n"
-    "MRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1Nb3VudGFpbiBWaWV3MRQw\n"
-    "EgYDVQQKDAtHb29nbGUsIEluYzEMMAoGA1UECwwDR1RQMRcwFQYDVQQDDA50ZWxl\n"
-    "cGhvbnkuZ29vZzEdMBsGCSqGSIb3DQEJARYOZ3RwQGdvb2dsZS5jb20wggIiMA0G\n"
-    "CSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCfvpF7aBV5Hp1EHsWoIlL3GeHwh8dS\n"
-    "lv9VQCegN9rD06Ny7MgcED5AiK2vqXmUmOVS+7NbATkdVYN/eozDhKtN3Q3n87kJ\n"
-    "Nt/TD/TcZZHOZIGsRPbrf2URK26E/5KzTzbzXVBOA1e+gSj+EBbltGqb01ZO5ErF\n"
-    "iPGViPM/HpYKdq6mfz2bS5PhU67XZMM2zvToyReQ/Fjm/6PJhwKSRXSgZF5djPhk\n"
-    "2LfOKMLS0AeZtd2C4DFsCU41lfLUkybioDgFuzTQ3TFi1K8A07KYTMmLY/yQppnf\n"
-    "SpNX58shlVhM+Ed37K1Z0rU0OfVCZ5P+KKaSSfMranjlU7zeUIhZYjqq/EYrEhbS\n"
-    "dLnNHwgJrqxzId3kq8uuLM6+VB7JZKnZLfT90GdAbX4+tutNe21smmogF9f80vEy\n"
-    "gM4tOp9rXrvz9vCwWHXVY9kdKemdLAsREoO6MS9k2ctK4jj80o2dROuFC6Q3e7mz\n"
-    "RjvZr5Tvi464c2o9o/jNlJ0O6q7V2eQzohD+7VnV5QPpRGXxlIeqpR2zoAg+WtRS\n"
-    "4OgHOVYiD3M6uAlggJA5pcDjMfkEZ+pkhtVcT4qMCEoruk6GbyPxS565oSHu16bH\n"
-    "EjeCqbZOVND5T3oA7nz6aQSs8sJabt0jmxUkGVnE+4ZDIuuRtkRma+0P/96Mtqor\n"
-    "OlpNWY1OBDY64QIDAQABo2AwXjAdBgNVHQ4EFgQU5GgKMUtcxkQ2dJrtNR5YOlIA\n"
-    "PDswHwYDVR0jBBgwFoAU5GgKMUtcxkQ2dJrtNR5YOlIAPDswDwYDVR0TAQH/BAUw\n"
-    "AwEB/zALBgNVHQ8EBAMCAQYwDQYJKoZIhvcNAQELBQADggIBAARQly5/bB6VUL2C\n"
-    "ykDYgWt48go407pAra6tL2kjpdfxV5PdL7iMZRkeht00vj+BVahIqZKrNOa/f5Fx\n"
-    "vlpahZFu0PDN436aQwRZ9qWut2qDOK0/z9Hhj6NWybquRFwMwqkPG/ivLMDU8Dmj\n"
-    "CIplpngPYNwXCs0KzdjSXYxqxJbwMjQXELD+/RcurY0oTtJMM1/2vKQMzw24UJqe\n"
-    "XLJAlsnd2AnWzWNUEviDZY89j9NdkHerBmV2gGzcU+X5lgOO5M8odBv0ZC9D+a6Z\n"
-    "QPZAOfdGVw60hhGvTW5s/s0dHwCpegRidhs0MD0fTmwwjYFBSmUx3Gztr4JTzOOr\n"
-    "7e5daJuak2ujQ5DqcGBvt1gePjSudb5brS7JQtN8tI/FyrnR4q/OuOwv1EvlC5RG\n"
-    "hLX+TXaWqFxB1Hd8ebKRR40mboFG6KcUI3lLBthDvQE7jnq48QfZMjlMQK0ZF1l7\n"
-    "SrlwRXWA74bU8CLJvnZKKo9p4TsTiDYGSYC6tNHKj5s3TGWL46oqGyZ0KdGNhrtC\n"
-    "rIGenMhth1vPYjyy0XuGBndXT85yi+IM2l8g8oU845+plxIhgpSI8bbC0oLwnhQ5\n"
-    "ARfsiYLkXDE7imSS0CSUmye76372mlzAIB1is4bBB/SzpPQtBuB9LDKtONgpSGHn\n"
-    "dGaXBy+qbVXVyGXaeEbIRjtJ6m92\n"
+    "MIIFWjCCA0KgAwIBAgIQbkepxUtHDA3sM9CJuRz04TANBgkqhkiG9w0BAQwFADBH\n"
+    "MQswCQYDVQQGEwJVUzEiMCAGA1UEChMZR29vZ2xlIFRydXN0IFNlcnZpY2VzIExM\n"
+    "QzEUMBIGA1UEAxMLR1RTIFJvb3QgUjEwHhcNMTYwNjIyMDAwMDAwWhcNMzYwNjIy\n"
+    "MDAwMDAwWjBHMQswCQYDVQQGEwJVUzEiMCAGA1UEChMZR29vZ2xlIFRydXN0IFNl\n"
+    "cnZpY2VzIExMQzEUMBIGA1UEAxMLR1RTIFJvb3QgUjEwggIiMA0GCSqGSIb3DQEB\n"
+    "AQUAA4ICDwAwggIKAoICAQC2EQKLHuOhd5s73L+UPreVp0A8of2C+X0yBoJx9vaM\n"
+    "f/vo27xqLpeXo4xL+Sv2sfnOhB2x+cWX3u+58qPpvBKJXqeqUqv4IyfLpLGcY9vX\n"
+    "mX7wCl7raKb0xlpHDU0QM+NOsROjyBhsS+z8CZDfnWQpJSMHobTSPS5g4M/SCYe7\n"
+    "zUjwTcLCeoiKu7rPWRnWr4+wB7CeMfGCwcDfLqZtbBkOtdh+JhpFAz2weaSUKK0P\n"
+    "fyblqAj+lug8aJRT7oM6iCsVlgmy4HqMLnXWnOunVmSPlk9orj2XwoSPwLxAwAtc\n"
+    "vfaHszVsrBhQf4TgTM2S0yDpM7xSma8ytSmzJSq0SPly4cpk9+aCEI3oncKKiPo4\n"
+    "Zor8Y/kB+Xj9e1x3+naH+uzfsQ55lVe0vSbv1gHR6xYKu44LtcXFilWr06zqkUsp\n"
+    "zBmkMiVOKvFlRNACzqrOSbTqn3yDsEB750Orp2yjj32JgfpMpf/VjsPOS+C12LOO\n"
+    "Rc92wO1AK/1TD7Cn1TsNsYqiA94xrcx36m97PtbfkSIS5r762DL8EGMUUXLeXdYW\n"
+    "k70paDPvOmbsB4om3xPXV2V4J95eSRQAogB/mqghtqmxlbCluQ0WEdrHbEg8QOB+\n"
+    "DVrNVjzRlwW5y0vtOUucxD/SVRNuJLDWcfr0wbrM7Rv1/oFB2ACYPTrIrnqYNxgF\n"
+    "lQIDAQABo0IwQDAOBgNVHQ8BAf8EBAMCAQYwDwYDVR0TAQH/BAUwAwEB/zAdBgNV\n"
+    "HQ4EFgQU5K8rJnEaK0gnhS9SZizv8IkTcT4wDQYJKoZIhvcNAQEMBQADggIBADiW\n"
+    "Cu49tJYeX++dnAsznyvgyv3SjgofQXSlfKqE1OXyHuY3UjKcC9FhHb8owbZEKTV1\n"
+    "d5iyfNm9dKyKaOOpMQkpAWBz40d8U6iQSifvS9efk+eCNs6aaAyC58/UEBZvXw6Z\n"
+    "XPYfcX3v73svfuo21pdwCxXu11xWajOl40k4DLh9+42FpLFZXvRq4d2h9mREruZR\n"
+    "gyFmxhE+885H7pwoHyXa/6xmld01D1zvICxi/ZG6qcz8WpyTgYMpl0p8WnK0OdC3\n"
+    "d8t5/Wk6kjftbjhlRn7pYL15iJdfOBL07q9bgsiG1eGZbYwE8na6SfZu6W0eX6Dv\n"
+    "J4J2QPim01hcDyxC2kLGe4g0x8HYRZvBPsVhHdljUEn2NIVq4BjFbkerQUIpm/Zg\n"
+    "DdIx02OYI5NaAIFItO/Nis3Jz5nu2Z6qNuFoS3FJFDYoOj0dzpqPJeaAcWErtXvM\n"
+    "+SUWgeExX6GjfhaknBZqlxi9dnKlC54dNuYvoS++cJEPqOba+MSSQGwlfnuzCdyy\n"
+    "F62ARPBopY+Udf90WuioAnwMCeKpSwughQtiue+hMZL77/ZRBIls6Kl0obsXs7X9\n"
+    "SQ98POyDGCBDTtWTurQ0sR8WNh8M5mQ5Fkzc4P4dyKliPUDqysU0ArSuiYgzNdws\n"
+    "E3PYJ/HQcu51OyLemGhmW/HGY0dVHLqlCFF1pkgl\n"
     "-----END CERTIFICATE-----\n";
 
 class SSLStreamAdapterTestBase;
@@ -566,6 +597,7 @@ class SSLStreamAdapterTestBase : public ::testing::Test,
   }
 
   // This tests that we give up after 12 DTLS resends.
+  // Only works for BoringSSL which allows advancing the fake clock.
   void TestHandshakeTimeout() {
     rtc::ScopedFakeClock clock;
     int64_t time_start = clock.TimeNanos();
@@ -603,7 +635,7 @@ class SSLStreamAdapterTestBase : public ::testing::Test,
                        1000);
       clock.AdvanceTime(time_increment);
     }
-    RTC_CHECK_EQ(client_ssl_->GetState(), rtc::SS_CLOSED);
+    EXPECT_EQ(client_ssl_->GetState(), rtc::SS_CLOSED);
   }
 
   // This tests that the handshake can complete before the identity is verified,
@@ -1113,19 +1145,18 @@ TEST_P(SSLStreamAdapterTestDTLSHandshake, TestGetSslCipherSuite) {
       server_cipher, ::testing::get<1>(GetParam()).type()));
 }
 
-// The RSA keysizes here might look strange, why not include the RFC's size
-// 2048?. The reason is test case slowness; testing two sizes to exercise
-// parametrization is sufficient.
 // Test different key sizes with SHA-256, then different signature algorithms
 // with ECDSA.
 INSTANTIATE_TEST_SUITE_P(
     SSLStreamAdapterTestDTLSHandshakeKeyParameters,
     SSLStreamAdapterTestDTLSHandshake,
-    Combine(Values(rtc::KeyParams::RSA(1024, 65537),
-                   rtc::KeyParams::RSA(1152, 65537),
+    Combine(Values(rtc::KeyParams::RSA(rtc::kRsaDefaultModSize,
+                                       rtc::kRsaDefaultExponent),
+                   rtc::KeyParams::RSA(2 * 1152, rtc::kRsaDefaultExponent),
                    rtc::KeyParams::ECDSA(rtc::EC_NIST_P256)),
-            Values(rtc::KeyParams::RSA(1024, 65537),
-                   rtc::KeyParams::RSA(1152, 65537),
+            Values(rtc::KeyParams::RSA(rtc::kRsaDefaultModSize,
+                                       rtc::kRsaDefaultExponent),
+                   rtc::KeyParams::RSA(2 * 1152, rtc::kRsaDefaultExponent),
                    rtc::KeyParams::ECDSA(rtc::EC_NIST_P256)),
             Values(std::make_pair(rtc::DIGEST_SHA_256, SHA256_DIGEST_LENGTH))));
 
@@ -1175,7 +1206,13 @@ TEST_F(SSLStreamAdapterTestDTLS, DISABLED_TestDTLSConnectWithSmallMtu) {
 }
 
 // Test a handshake with total loss and timing out.
-TEST_F(SSLStreamAdapterTestDTLS, TestDTLSConnectTimeout) {
+// Only works in BoringSSL.
+#ifdef OPENSSL_IS_BORINGSSL
+#define MAYBE_TestDTLSConnectTimeout TestDTLSConnectTimeout
+#else
+#define MAYBE_TestDTLSConnectTimeout DISABLED_TestDTLSConnectTimeout
+#endif
+TEST_F(SSLStreamAdapterTestDTLS, MAYBE_TestDTLSConnectTimeout) {
   SetLoss(100);
   TestHandshakeTimeout();
 }