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Configure HTTPs settings

After proxying a basic website through Cloudflare, you can use Terraform to adjust some of the settings on your zone. In this tutorial, you will configure some optional HTTPS settings and then push the updated configuration to GitHub for posterity.

You will use a new git branch for the changes and then merge it into master before applying. On a team, you might consider using this step as an opportunity for others to review your change before merging and deploying it. You can also integrate Terraform into your CI/CD system to perform tests automatically using another Cloudflare domain.

1. Create a new branch and append the new zone settings

In this step, modify the Terraform configuration to enable the following settings: TLS 1.3, Always Use HTTPS, Strict SSL mode, and the Cloudflare WAF. Strict mode requires a valid SSL certificate on your origin, so be sure to use the Cloudflare Origin CA to generate one.

$ git checkout -b step3-https
Switched to a new branch 'step3-https'
$ cat >> cloudflare.tf <<'EOF'
resource "cloudflare_zone_settings_override" "example-com-settings" {
name = var.zone_id
settings {
tls_1_3 = "on"
automatic_https_rewrites = "on"
ssl = "strict"
waf = "on"
}
}
EOF

2. Preview and merge the changes

Review what Terraform is proposing before applying changes. The terraform plan output is filtered to ignore the values that will be "computed" — in this case, settings that will keep their default values.

$ terraform plan | grep -v "<computed>"
Refreshing Terraform state in-memory prior to plan...
The refreshed state will be used to calculate this plan, but will not be
persisted to local or remote state storage.
cloudflare_record.www: Refreshing state... (ID: c38d3103767284e7cd14d5dad3ab8668)
------------------------------------------------------------------------
An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
+ create
Terraform will perform the following actions:
+ cloudflare_zone_settings_override.example-com-settings
name: "example.com"
settings.#: "1"
settings.0.automatic_https_rewrites: "on"
settings.0.ssl: "strict"
settings.0.tls_1_3: "on"
settings.0.waf: "on"
Plan: 1 to add, 0 to change, 0 to destroy.
------------------------------------------------------------------------
Note: You didn't specify an "-out" parameter to save this plan, so Terraform
can't guarantee that exactly these actions will be performed if
"terraform apply" is subsequently run.

The proposed changes look good, so you can merge them into master and then apply them with terraform apply. When working on a team, you may want to require pull requests and use this opportunity to peer review any proposed configuration changes.

$ git add cloudflare.tf
$ git commit -m "Step 3 - Enable TLS 1.3, Always Use HTTPS, and SSL Strict mode."
[step3-https d540600] Step 3 - Enable TLS 1.3, Always Use HTTPS, and SSL Strict mode.
1 file changed, 11 insertions(+)
$ git checkout master
Switched to branch 'master'
$ git merge step3-https
Updating d26f40b..d540600
Fast-forward
cloudflare.tf | 11 +++++++++++
1 file changed, 11 insertions(+)
$ git push
Counting objects: 3, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 501 bytes | 0 bytes/s, done.
Total 3 (delta 1), reused 0 (delta 0)
remote: Resolving deltas: 100% (1/1), completed with 1 local object.
To git@github.com:$GITHUB_USER/cf-config.git
d26f40b..d540600 master -> master

3. Apply and verify the changes

Before applying the changes, try to connect with TLS 1.3. Technically, you should not be able to with default settings. To follow along with this test, you will need to compile curl against BoringSSL.

$ curl -v --tlsv1.3 https://www.upinatoms.com 2>&1 | grep "SSL connection\|error"
* error:1000042e:SSL routines:OPENSSL_internal:TLSV1_ALERT_PROTOCOL_VERSION
curl: (35) error:1000042e:SSL routines:OPENSSL_internal:TLSV1_ALERT_PROTOCOL_VERSION

As shown above, you should receive an error because TLS 1.3 is not yet enabled on your zone. Enable it by running terraform apply and try again.

$ terraform apply --auto-approve
cloudflare_record.www: Refreshing state... (ID: c38d3103767284e7cd14d5dad3ab8668)
cloudflare_zone_settings_override.example-com-settings: Creating...
initial_settings.#: "" => "<computed>"
initial_settings_read_at: "" => "<computed>"
name: "" => "example.com"
readonly_settings.#: "" => "<computed>"
settings.#: "" => "1"
settings.0.advanced_ddos: "" => "<computed>"
settings.0.always_online: "" => "<computed>"
settings.0.always_use_https: "" => "<computed>"
settings.0.automatic_https_rewrites: "" => "on"
settings.0.brotli: "" => "<computed>"
settings.0.browser_cache_ttl: "" => "<computed>"
settings.0.browser_check: "" => "<computed>"
settings.0.cache_level: "" => "<computed>"
settings.0.challenge_ttl: "" => "<computed>"
settings.0.cname_flattening: "" => "<computed>"
settings.0.development_mode: "" => "<computed>"
settings.0.edge_cache_ttl: "" => "<computed>"
settings.0.email_obfuscation: "" => "<computed>"
settings.0.hotlink_protection: "" => "<computed>"
settings.0.http2: "" => "<computed>"
settings.0.ip_geolocation: "" => "<computed>"
settings.0.ipv6: "" => "<computed>"
settings.0.max_upload: "" => "<computed>"
settings.0.minify.#: "" => "<computed>"
settings.0.mirage: "" => "<computed>"
settings.0.mobile_redirect.#: "" => "<computed>"
settings.0.opportunistic_encryption: "" => "<computed>"
settings.0.origin_error_page_pass_thru: "" => "<computed>"
settings.0.polish: "" => "<computed>"
settings.0.prefetch_preload: "" => "<computed>"
settings.0.privacy_pass: "" => "<computed>"
settings.0.pseudo_ipv4: "" => "<computed>"
settings.0.response_buffering: "" => "<computed>"
settings.0.rocket_loader: "" => "<computed>"
settings.0.security_header.#: "" => "<computed>"
settings.0.security_level: "" => "<computed>"
settings.0.server_side_exclude: "" => "<computed>"
settings.0.sha1_support: "" => "<computed>"
settings.0.sort_query_string_for_cache: "" => "<computed>"
settings.0.ssl: "" => "strict"
settings.0.tls_1_2_only: "" => "<computed>"
settings.0.tls_1_3: "" => "on"
settings.0.tls_client_auth: "" => "<computed>"
settings.0.true_client_ip_header: "" => "<computed>"
settings.0.waf: "" => "on"
settings.0.webp: "" => "<computed>"
settings.0.websockets: "" => "<computed>"
zone_status: "" => "<computed>"
zone_type: "" => "<computed>"
cloudflare_zone_settings_override.example-com-settings: Creation complete after 2s (ID: e2e6491340be87a3726f91fc4148b125)
Apply complete! Resources: 1 added, 0 changed, 0 destroyed.

Now you can try the same command from above and see it succeed.

$ curl -v --tlsv1.3 https://www.example.com 2>&1 | grep "SSL connection\|error"
* SSL connection using TLSv1.3 / AEAD-AES128-GCM-SHA256