> ## Documentation Index
> Fetch the complete documentation index at: https://developer.upsun.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Tighten up your TLS

> Discover new TLS-related features for increased website security on Platform.sh. Restrict TLS versions, enable HSTS, and implement client-authenticated TLS.

export const PostMeta = ({data = {}}) => {
  const {author, date} = data;
  const authors = Array.isArray(author) ? author : author ? [author] : [];
  const resolveAuthor = slug => {
    const entry = AUTHOR_MAP[slug] || ({});
    const name = entry.name || slug;
    const github = entry.github || null;
    const linkedin = entry.linkedin || null;
    const url = github ? `https://github.com/${github}` : linkedin || null;
    const avatarUrl = github ? `https://github.com/${github}.png?size=64` : null;
    return {
      name,
      url,
      avatarUrl
    };
  };
  const formattedDate = date ? new Date(date).toLocaleDateString('en-US', {
    year: 'numeric',
    month: 'long',
    day: 'numeric'
  }) : null;
  if (authors.length === 0 && !formattedDate) return null;
  const AUTHOR_MAP = {
    "aaron-collier": {
      "name": "Aaron Collier"
    },
    "aaron-dudenhofer": {
      "name": "Aaron Dudenhofer"
    },
    "aaron-porter": {
      "name": "Aaron Porter"
    },
    "adriaan-odendaal": {
      "name": "Adriaan Odendaal"
    },
    "ajmal": {
      "name": "Ajmal Siddiqui"
    },
    "akalipetis": {
      "name": "Antonis Kalipetis"
    },
    "alexander-varwijk": {
      "name": "Alexander Varwijk"
    },
    "alicia-bevilacqua": {
      "name": "Alicia Bevilacqua"
    },
    "amelie-deguerry": {
      "name": "Amelie Deguerry"
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    "anacidre": {
      "name": "Ana Cidre",
      "linkedin": "https://www.linkedin.com/in/ana-cidre"
    },
    "andoni": {
      "name": "Andoni Auzmendi"
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      "name": "Andrei (Alex) Taranu",
      "linkedin": "https://www.linkedin.com/in/andrei-alex-taranu/"
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    "andrew-melck": {
      "name": "Andrew Melck"
    },
    "antoine-crochet-damais": {
      "name": "Antoine Crochet Damais"
    },
    "augustin-delaporte": {
      "name": "Augustin Delaporte",
      "linkedin": "https://www.linkedin.com/in/augustindelaporte/"
    },
    "branislav-bujisic": {
      "name": "Branislav Bujisic"
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    "carl-smith": {
      "name": "Carl Smith"
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    "caroline-leroy": {
      "name": "Caroline Leroy"
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    "cati-mayer": {
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    "catplat": {
      "name": "C Trinkwon"
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    "ceelolulu": {
      "name": "Celeste van der Watt"
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      "name": "Dan Morrison"
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      "github": "davidbonachera",
      "linkedin": "https://www.linkedin.com/in/davidbonachera"
    },
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      "name": "Ahmet Faruk Dereli"
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    "devicezero": {
      "name": "Jonas Kröger",
      "github": "devicezero",
      "linkedin": "https://www.linkedin.com/in/jonaskroeger/"
    },
    "doug-goldberg": {
      "name": "Doug Goldberg"
    },
    "duncan-naves": {
      "name": "Duncan Naves",
      "github": "duncannaves",
      "linkedin": "https://www.linkedin.com/in/duncan-naves-a94423aa"
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    "erika-bustamante": {
      "name": "Erika Bustamante"
    },
    "fabpot": {
      "name": "Fabien Potencier"
    },
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      "name": "Florent Huck",
      "github": "flovntp",
      "linkedin": "https://www.linkedin.com/in/florenthuck"
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      "name": "Fred Plais"
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      "name": "Gauthier Garnier"
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      "name": "Guillaume Moigneu",
      "github": "gmoigneu",
      "linkedin": "https://www.linkedin.com/in/guillaumemoigneu/"
    },
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      "name": "Greg Qualls"
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    "guguss": {
      "name": "Augustin Delaporte"
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    },
    "ivana-kotur": {
      "name": "Ivana Kotur"
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    "jackrabbithanna": {
      "name": "Mark Hanna"
    },
    "jared-wright": {
      "name": "Jared Wright",
      "github": "jww-sh",
      "linkedin": "https://www.linkedin.com/in/jaredwaynewright"
    },
    "jessica-orozco": {
      "name": "Jessica Orozco"
    },
    "joey-stanford": {
      "name": "Joey Stanford"
    },
    "john-grubb": {
      "name": "John Grubb"
    },
    "jonas-kruger": {
      "name": "Jonas Kruger"
    },
    "kathryn-frazer": {
      "name": "Kathryn Frazer"
    },
    "kemiojo": {
      "name": "Kemi Elizabeth Ojogbede"
    },
    "kieronsambrook-smith": {
      "name": "Kieronsambrook Smith"
    },
    "laurent-arnoud": {
      "name": "Laurent Arnoud",
      "linkedin": "https://www.linkedin.com/in/laurent-arnoud-861b44121/"
    },
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    "lolautruche": {
      "name": "Jérôme Vieilledent"
    },
    "lyly-lepinay": {
      "name": "Lyly Lepinay"
    },
    "manauwar-alam": {
      "name": "Manauwar Alam"
    },
    "marc-antoine-porri": {
      "name": "Marc Antoine Porri"
    },
    "maria-antinkaapo": {
      "name": "Maria Antinkaapo"
    },
    "maria-de-anton": {
      "name": "Maria De Anton"
    },
    "mark-dorison": {
      "name": "Mark Dorison"
    },
    "markus-hausammann": {
      "name": "Markus Hausammann"
    },
    "mary-thomas": {
      "name": "Mary Thomas"
    },
    "mathias-bolt-lesniak": {
      "name": "Mathias Bolt Lesniak"
    },
    "mathieu-strauch": {
      "name": "Mathieu Strauch"
    },
    "matthias-van-woensel": {
      "name": "Matthias Van Woensel",
      "linkedin": "https://www.linkedin.com/in/matthias-van-woensel-267a069"
    },
    "maz-mohammadi": {
      "name": "Maz Mohammadi"
    },
    "michael-sharp": {
      "name": "Michael Sharp"
    },
    "mupsi": {
      "name": "Marine Gandy"
    },
    "natalie-harper": {
      "name": "Natalie Harper"
    },
    "ngommenginger": {
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      "linkedin": "https://www.linkedin.com/in/nicolas-gommenginger"
    },
    "nicholas-bennison": {
      "name": "Nicholas Bennison"
    },
    "nicholas-vahalik": {
      "name": "Nicholas Vahalik"
    },
    "nick-hardiman": {
      "name": "Nick Hardiman"
    },
    "nickanderegg": {
      "name": "Nickanderegg"
    },
    "nicolas-grekas": {
      "name": "Nicolas Grekas",
      "github": "nicolas-grekas",
      "linkedin": "https://www.linkedin.com/in/nicolasgrekas/"
    },
    "niti-malwade": {
      "name": "Niti Malwade"
    },
    "opensocialteam": {
      "name": "Opensocialteam"
    },
    "ori-pekelman": {
      "name": "Ori Pekelman"
    },
    "otavio-santana": {
      "name": "Otavio Santana"
    },
    "palwandi": {
      "name": "Pawan Alwandi",
      "github": "pawpy",
      "linkedin": "https://www.linkedin.com/in/pawanalwandi"
    },
    "patrick-boest": {
      "name": "Patrick Boest"
    },
    "patrick-dawkins": {
      "name": "Patrick Dawkins",
      "github": "pjcdawkins",
      "linkedin": "https://www.linkedin.com/in/patrickdawkins"
    },
    "patrick-klima": {
      "name": "Patrick Klima"
    },
    "pjcdawkins": {
      "name": "Pjcdawkins"
    },
    "prineet-kaurbhurji": {
      "name": "Prineet Kaurbhurji"
    },
    "quentin-sinig": {
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    "ralt": {
      "name": "Florian Margaine",
      "github": "ralt",
      "linkedin": "https://www.linkedin.com/in/florian-margaine-43971136"
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      "name": "Ramanathanramakrishnamurthy"
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    "remi-lejeune": {
      "name": "Rémi Lejeune"
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    "ribel": {
      "name": "Taras Kruts"
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    "robert-douglass": {
      "name": "Robert Douglass"
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    "rudy-weber": {
      "name": "Rudy Weber"
    },
    "ryan-hicks": {
      "name": "Ryan Hicks"
    },
    "sabri-helal": {
      "name": "Sabri Helal"
    },
    "savannah-bergeron": {
      "name": "Savannah Bergeron"
    },
    "shannon-vettes": {
      "name": "Shannon Vettes"
    },
    "shawn-ogasawara": {
      "name": "Shawn Ogasawara",
      "linkedin": "https://www.linkedin.com/in/shawn-ogasawara-83a9a0/"
    },
    "shawna-spoor": {
      "name": "Shawna Spoor"
    },
    "shedrack-akintayo": {
      "name": "Shedrack Akintayo"
    },
    "simon-ruggier": {
      "name": "Simon Ruggier"
    },
    "sophie-van-der-kindere": {
      "name": "Sophie Van Der Kindere"
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    "stefanos-thampis": {
      "name": "Stefanos Thampis"
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    "stephen-weinberg": {
      "name": "Stephen Weinberg"
    },
    "sukhman-virk": {
      "name": "Sukhman Virk"
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      "name": "Sumaira Nazir"
    },
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      "name": "Sümer Cip"
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      "name": "Tamara Bacchia"
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    "theosakamg": {
      "name": "Mickael Gaillard",
      "github": "theosakamg"
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      "name": "Thomas di Luccio"
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    "tim-anderson": {
      "name": "Tim Anderson"
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    "tom-helmer-hansen": {
      "name": "Tom Helmer Hansen"
    },
    "tylermills": {
      "name": "Tyler Mills"
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      "linkedin": "https://www.linkedin.com/in/veronika-tolkachova-169167a2"
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      "name": "Yuriy Babenko"
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    "yuriy-gerasimov": {
      "name": "Yuriy Gerasimov"
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  };
  return <div className="post-meta">
      {(authors.length > 0 || formattedDate) && <div className="post-meta-info">
          {authors.length > 0 && <div className="post-meta-authors">
              {authors.map(slug => {
    const {name, url, avatarUrl} = resolveAuthor(slug);
    const inner = <>
                    {avatarUrl && <img src={avatarUrl} alt={name} className="post-meta-avatar" />}
                    <span className="post-meta-author-name">{name}</span>
                  </>;
    return url ? <a key={slug} href={url} target="_blank" rel="noopener noreferrer" className="post-meta-author">
                    {inner}
                  </a> : <span key={slug} className="post-meta-author">{inner}</span>;
  })}
            </div>}
          {authors.length > 0 && formattedDate && <span className="post-meta-separator" aria-hidden="true">·</span>}
          {formattedDate && <span className="post-meta-date">{formattedDate}</span>}
        </div>}
    </div>;
};

<PostMeta data={{ author: ["crell"], date: "2017-12-28", image: "/images/posts/unknown/tighten-up-your-tls/tighten-up-your-tls.webp" }} />

<Tip>
  This post was originally published on the Platform.sh blog and reflects information from the time of publication.
</Tip>

Transport Layer Security (TLS) is the encryption protocol used by all secure websites today. It's the "S" in "HTTPS", which you'll see on virtually all Platform.sh-hosted projects (thank you, [Let's Encrypt](/posts/unknown/free-ssl-certificates-for-every-project-every-environment)!), and has replaced SSL for that task. For most sites simply enabling it by default is sufficient to keep a site secure, and that happens automatically in Platform.sh's case. However, in some cases it's helpful to tweak even further.

That's why we're happy to announce that as of today we're rolling out several new TLS-related features for all sites.

### TLS version restriction

Like any protocol, TLS is periodically updated with new versions that address security weaknesses in older versions. Almost all browsers today TLS 1.2, which is the latest, as well as all earlier versions including SSL. That means when a browser connects to your site it will use the most up to date version that both the server and browser both support. In most cases that's perfectly fine.

If you want to really lock down your site, however, at the cost of banning a few really old web browsers, you can now set a minimum TLS version that a browser must use. That's a requirement of some security compliance programs, too. If the browser tries to use an older, insecure version of TLS it will get blocked. Just add the following snippet to a particular route in your `routes.yaml` file.

```yaml theme={null}
tls:
    min_version: TLSv1.2

```

And now that domain will reject any HTTPS connection that isn't using at least TLS 1.2.

### HSTS support

HTTP Strict Transport Security (HSTS) lets you tell browsers that they should use HTTPS for all requests to a site, even if a stray link happens to use HTTP. You can now enable it by simply adding the following block to a route in `routes.yaml`:

```yaml theme={null}
tls:
    strict_transport_security:
        enabled:true

```

Now, that site will send an HSTS header with all requests, telling browsers to enforce HTTPS usage.

### Client-authenticated TLS

Often when a site is being used as an API backend for an IoT device or mobile client application it's necessary to lock the site down to access just from selected users using TLS. This process is called "Client-authenticated TLS", and requires loading custom root TLS certificates on the server that determine whether or not a particular client request is authorized.

Starting today, it's also possible to provide those custom certificates as part of your route. Once again, it's just a few lines in a route definition:

```yaml theme={null}
tls:
    client_authentication: "require"
    client_certificate_authorities:
        - !include
            type: string
            path: file1.key
        - !include
            type: string
            path: file2.key

```

More information on all three options is available [in our documentation](https://docs.platform.sh/configuration/routes/https.html).

Enjoy your more-secure sites!