May 20, 2020
Upgrading to TLS 1.2
Are you using TLS older than 1.2? It’s ok, maintenance update delays happen to everyone. We get it. However, it is time to move on.
Remember way back in June 2018 when we deprecated the use of TLS 1.0? If you don’t, that is okay, you can read all about it in esta entrada. Well, here we are, 2 years later and the next version is about to be sidelined so we want you to be prepared and avoid any interruption in service. This post is all about getting you prepared to run without the use of TLS1.1 so we can restrict access to TLS1.2 only. We will walk you through how to check your current version and how to upgrade a la latest. Just for kicks, we’d really like to hear your feedback and add you to a “wall of awesomeness” featuring all those security-conscious companies who make the change early.
¿Me afecta?
Back in 2018 we asked our customers to upgrade, and TLS 1.2 has been the recommendation for quite some time, so it is very likely that you are NO affected. However, if you use any method to inject messages (SMTP or REST API) or collect data (metrics or webhooks, etc), then you really should check now to make sure your system can support TLS 1.2. Make sure you run the following tests on the servers that actually connect to SparkPost.
Por qué es importante
SparkPost no aceptará conexiones en TLS 1.1 después de septiembre de 2020
Las versiones anteriores no son seguras
TLS 1.2 es el protocolo recomendado desde hace más de una década
Todos los chicos guays lo hacen
¿Por qué ahora?
Actually, the question should be “¿por qué sigues apoyándolo?” TLS 1.2 has been the recommended secure standard for more than a decade and we are down a la wire on anyone actually offering any support at all for cualquier cosa inferior a TLS1.2. It is time for débil soporte HTTPS para morir once and for all. If you are still using TLS 1.1 past March 2020 you are going to have a hard time connecting to most services. SparkPost has provided ample grace to get this updated and now we are sending out final notices to get this upgraded before September when we kill it off for good.
Pero, ¿cómo se puede arreglar?
It is very possible that your IT SysAdmin or WebAdmin has done this already for you as part of their normal maintenance. If so you should buy them a beer and say thank you. If not you can follow some of the steps below to get it done in Linux, Windows, and Mac.
Tenga en cuenta que a lo largo de este documento realizaremos pruebas con el punto final SparkPost de EE.UU.
Si normalmente utiliza el despliegue europeo, deberá utilizar en su lugar el punto final UE.
¿Cómo se puede comprobar? (versión Linux)
First, let’s check to see if your friendly neighborhood SysAdmin already took care of this for you. This is actually part of the SSL configuration so it can be managed in your system config. Assuming you are using Linux, the most descriptive method is using nmap but you también puede utilizar openssl. You can use nmap with Linux, Windows and Mac, but we will explore other methods for Windows and Macs as well if you don’t want to install new software.
To do this with nmap, test the ciphers against a known HTTPS host. Since the point is to make sure we are connecting to SparkPost securely, let’s test against that endpoint. Make sure you run the following tests on the servers that actually connect to SparkPost.
nmap --script ssl-enum-ciphers -p 443 api.sparkpost.com
This was done on my own development server and you can easily see my configuration supports TLS 1.1 and 1.2 but not 1.3. It is important to note at this point that AWS ALBs, and therefore SparkPost connections, do not yet support TLS1.3, but it is on the AWS roadmap.
Starting Nmap 6.40 ( http://nmap.org ) at 2020-05-06 22:41 UTC Informe de escaneo de Nmap para api.sparkpost.com (52.13.246.255) El host está activo (latencia de 0.00059s). Otras direcciones para api.sparkpost.com (no escaneadas): 34.211.102.211 52.43.22.201 54.213.185.174 100.20.154.199 52.43.110.79 52.40.215.39 52.40.175.169 Registro rDNS para 52.13.246.255: ec2-52-13-246-255.us-west-2.compute.amazonaws.com ESTADO DEL PUERTO SERVICIO 443/tcp open https | ssl-enum-ciphers: | TLSv1.1: | Cifrados: | TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - strong TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong TLS_RSA_WITH_AES_128_CBC_SHA - strong TLS_RSA_WITH_AES_256_CBC_SHA - strong Compresores: | TLSv1.2: | Cifrado: | TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - fuerte TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 - fuerte TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 - fuerte fuerte | TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - fuerte | TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 - fuerte | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - fuerte | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - fuerte fuerte | TLS_RSA_WITH_AES_128_CBC_SHA - fuerte | TLS_RSA_WITH_AES_128_CBC_SHA256 - fuerte | TLS_RSA_WITH_AES_128_GCM_SHA256 - fuerte fuerte | TLS_RSA_WITH_AES_256_CBC_SHA - fuerte | TLS_RSA_WITH_AES_256_CBC_SHA256 - fuerte | TLS_RSA_WITH_AES_256_GCM_SHA384 - fuerte | compresores: | NULL |_ fuerza mínima: fuerte Nmap realizado: 1 dirección IP (1 host up) escaneada en 0.11 segundos
At this point, you can actually stop if you want because the point is to make sure you are able to connect to SparkPost using TLS 1.2. If your connection supports TLS 1.2 that is what we need at this point so we are all good here. Go buy that SysAdmin a beer and say thank you.
Send us an correo electrónico y háganoslo saber you were successful.
Buscar asistencia en su Mac
En most common reason you may need to check for support on your Mac is that you use it for local development, so let’s assume that and check for your support.
El método menos invasivo es utilizar curl, que debería estar integrado en todos los Mac. Ejecute la aplicación Terminal y utilice el indicador de protocolo para probar específicamente TLS1.2.
curl https://api.sparkpost.com/ --tlsv1.2 --verbose * Trying 54.213.185.174... * TCP_NODELAY set * Connected to api.sparkpost.com (54.213.185.174) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH * successfully set certificate verify locations: * CAfile: /etc/ssl/cert.pem CApath: none * TLSv1.2 (OUT), TLS handshake, Client hello (1): * TLSv1.2 (IN), TLS handshake, Server hello (2): * TLSv1.2 (IN), TLS handshake, Certificate (11): * TLSv1.2 (IN), TLS handshake, Server key exchange (12): * TLSv1.2 (IN), TLS handshake, Server finished (14): * TLSv1.2 (OUT), TLS handshake, Client key exchange (16): * TLSv1.2 (OUT), TLS change cipher, Client hello (1): * TLSv1.2 (OUT), TLS handshake, Finished (20): * TLSv1.2 (IN), TLS change cipher, Client hello (1): * TLSv1.2 (IN), TLS handshake, Finished (20): * SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256 * ALPN, server accepted to use h2 * Server certificate: * subject: CN=*.sparkpost.com * start date: Jan 30 00:00:00 2020 GMT * expire date: Feb 28 12:00:00 2021 GMT * subjectAltName: host "api.sparkpost.com" matched cert's "*.sparkpost.com" * issuer: C=US; O=Amazon; OU=Server CA 1B; CN=Amazon * SSL certificate verify ok. * Using HTTP2, server supports multi-use * Connection state changed (HTTP/2 confirmed) * Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0 * Using Stream ID: 1 (easy handle 0x7fbd69805200) > GET / HTTP/2 > Host: api.sparkpost.com > User-Agent: curl/7.54.0 > Accept: */* > * Connection state changed (MAX_CONCURRENT_STREAMS updated)! < HTTP/2 200 < date: Thu, 07 May 2020 15:14:30 GMT < content-type: text/plain < content-length: 95 < server: msys-http < * Connection #0 to host api.sparkpost.com left intact Oh hey! You should come work with us and build awesome stuff!
Si quieres probar usando la conexión SMTP, también puedes hacerlo con este comando:
openssl s_client -crlf -starttls smtp -tls1_2 -connect smtp.sparkpostmail.com:587
Devuelve gran cantidad de datos, entre ellos:
Sesión SSL: Protocolo : TLSv1.2 Cifrado : ECDHE-RSA-AES256-GCM-SHA384
Comprobación de compatibilidad en Windows
Similar to the Mac use case, the most common reason you may need to check for support in your Windows is that you use it for local development, so let’s assume that and check for your support.
Windows 7 and Windows 10 use basically the same process. If you are using something earlier, please upgrade as prior versions do not support TLS 1.2.
Empieza haciendo clic en START en la esquina inferior izquierda (normalmente).
Escriba "Opciones de Internet" y seleccione la coincidencia en la lista resultante.
Haga clic en la pestaña Avanzado y desplácese hasta la parte inferior. Si la opción TLS 1.2 está marcada, ya está todo listo. Si no lo está, marque la casilla adyacente a Usar TLS 1.2 y luego Aplicar.
Wait, what? No 1.2?
Bummer dude. Your work is not done yet.
Si sólo tiene TLS1.1, entonces debe actualizar su configuración de Cifrado.
Assuming you are using Linux and Apache for TLS connection management, you can update the SSL configuration by modifying this line to add “+TLSv1.2 ”:
SSLProtocol -all +TLSv1 +TLSv1.1 +TLSv1.2
(Nota al margen: Dado que ya no se admiten en ningún sitio, tiene sentido eliminar también las configuraciones 1.0 y 1.1 mientras estás aquí).
That config is typically located in /etc/httpd/conf.d/ssl.conf
Restart Apache and you are good to go.
service httpd restart
If you are using Nginx, you will want to modify this line in a similar way:
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
That config is typically located in /etc/nginx/conf.d/
Restart Nginx and you are good to go.
service nginx restart
If you run into any error messages with the restart, you may have an out-dated SSL library. Make sure you are using at least openssl v1.0.1g.
Si utiliza Windows, las instrucciones para configurar TLS1.2 se encuentran en la sección "Comprobación de compatibilidad en Windows" anterior.
All done now? Send us an correo electrónico y háganoslo saber you were successful.
Un paso más allá
Why stop at TLS 1.2 when you know – simplemente sabes – that we are all going to have to upgrade to TLS 1.3 in the next year or so. Why not just upgrade to TLSv1.3 while we are at it?
Unfortunately, AWS ALBs do not support TLS1.3 yet, so if you do upgrade your configuration, your connection to SparkPost and any other AWS service that uses the ALB layer will still be limited to TLS1.2. Personally, I still think it is a good idea to get ahead of the curve and upgrade to 1.3 while you are making changes anyway.
If you want to add TLS 1.3 support you will probably have to update your OpenSSL library first to V1.1.1 or later and then add +TLSv1.3 to the protocol line mentioned above. Similar instructions puede consultarse aquí for Nginx and Cloudflare as well.
Manténgase a salvo ahí fuera
Finally, It would be great if you could envíenos un correo electrónico to let us know you have verified you are TLS 1.2 capable. We really don’t want to cut anyone off and the drop-dead date is September 2020. If we know you are all in the safe zone, we’ll feel much better about turning off the old support.