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Code Issues Activity

Should I use encrypted DNS update (#926)

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Signed-off-by: Daniel Gray <dng@disroot.org>
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Razac-elda
2022-04-07 13:14:50 +00:00
committed by Daniel Gray
parent a98a1e4c5b
commit 8776541daa
1 changed files with 103 additions and 102 deletions
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docs/technology/dns.md
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@@ -109,22 +109,7 @@ We can see the [connection establishment](https://en.wikipedia.org/wiki/Transmis
## Why **shouldn't** I use encrypted DNS? ## Why **shouldn't** I use encrypted DNS?
In locations where there is internet filtering (or censorship), visiting forbidden resources may have its own consequences which you should consider in your [threat model](/threat-modeling/). We do **not** suggest the use of encrypted DNS for this purpose. Use [Tor](https://torproject.org) or a [VPN](/providers/vpn/) instead. If you're using a VPN, you should use your VPN's DNS servers. When using a VPN, you are already trusting them with all your network activity. We made this flow chart to describe when you *should* use "encrypted DNS": In locations where there is internet filtering (or censorship), visiting forbidden resources may have its own consequences which you should consider in your [threat model](/threat-modeling/). We do **not** suggest the use of encrypted DNS for this purpose. Use [Tor](https://torproject.org) or a [VPN](/providers/vpn/) instead. If you're using a VPN, you should use your VPN's DNS servers. When using a VPN, you are already trusting them with all your network activity.
``` mermaid
graph TB
Start[Start] --> anonymous{Trying to be anonymous?}
anonymous--> | Yes | tor(Use Tor)
anonymous --> | No | censorship{Avoiding censorship?}
censorship --> | Yes | vpnOrTor(Use VPN or Tor)
censorship --> | No | privacy{Want privacy from ISP?}
privacy --> | Yes | vpnOrTor
privacy --> | No | obnoxious{ISP makes obnoxious redirects?}
obnoxious --> | Yes | encryptedDNS(Use encrypted DNS with 3rd party)
obnoxious --> | No | ispDNS{Does ISP support encrypted DNS?}
ispDNS --> | Yes | useISP(Use encrypted DNS with ISP)
ispDNS --> | No | nothing(Do nothing)
```
When we do a DNS lookup, it's generally because we want to access a resource. Below, we will discuss some of the methods that may disclose your browsing activities even when using encrypted DNS: When we do a DNS lookup, it's generally because we want to access a resource. Below, we will discuss some of the methods that may disclose your browsing activities even when using encrypted DNS:
@@ -211,14 +196,13 @@ We can simulate what a browser would do using the [`openssl`](https://en.wikiped
openssl x509 -noout -ocsp_uri -in /tmp/pg_server.cert openssl x509 -noout -ocsp_uri -in /tmp/pg_server.cert
``` ```
Our certificate shows the Lets Encrypt certificate responder.
If we want to see all the details of the certificate we can use: If we want to see all the details of the certificate we can use:
```bash ```bash
openssl x509 -text -noout -in /tmp/pg_server.cert openssl x509 -text -noout -in /tmp/pg_server.cert
``` ```
Our certificate shows the Lets Encrypt certificate responder.
5. Start the packet capture: 5. Start the packet capture:
```bash ```bash
@@ -274,7 +258,24 @@ If the network observer has the public certificate, which is publicly available,
## Should I use encrypted DNS? ## Should I use encrypted DNS?
You should only use DNS if your [threat model](/threat-modeling/) doesn't require you to hide any of your browsing activity. Encrypted DNS should only be used to get around basic [DNS blocking](https://en.wikipedia.org/wiki/DNS_blocking) when you can be sure there won't be any consequences. We made this flow chart to describe when you *should* use encrypted DNS:
``` mermaid
graph TB
Start[Start] --> anonymous{Trying to be<br> anonymous?}
anonymous--> | Yes | tor(Use Tor)
anonymous --> | No | censorship{Avoiding<br> censorship?}
censorship --> | Yes | vpnOrTor(Use<br> VPN or Tor)
censorship --> | No | privacy{Want privacy<br> from ISP?}
privacy --> | Yes | vpnOrTor
privacy --> | No | obnoxious{ISP makes<br> obnoxious<br> redirects?}
obnoxious --> | Yes | encryptedDNS(Use<br> encrypted DNS<br> with 3rd party)
obnoxious --> | No | ispDNS{Does ISP support<br> encrypted DNS?}
ispDNS --> | Yes | useISP(Use<br> encrypted DNS<br> with ISP)
ispDNS --> | No | nothing(Do nothing)
```
Encrypted DNS with a 3rd party should only be used to get around redirects and basic [DNS blocking](https://en.wikipedia.org/wiki/DNS_blocking) when you can be sure there won't be any consequences or you're interested in a provider that does some rudimentary filtering.
[List of recommended DNS servers](../dns.md){ .md-button } [List of recommended DNS servers](../dns.md){ .md-button }