* Update caddy.rst - Some terminology changes for the new os-caddy version.
* Update caddy.rst - Small Typo fixed.
* Update caddy.rst - DNS01 is not needed for Dynamic DNS to work
* Update caddy.rst - Another small typo.
* Update caddy.rst
Add HTTP-01 challenge redirection option
* Update caddy.rst
- Added Tutorial section for the HTTP-01 challenge redirection
- A few more changes to get the docs in line with the new os-caddy-1.5.3 update
* Update caddy.rst - Add HTTP Response Code and Message
* Update caddy.rst - Add Header Manipulation
* Update caddy.rst - Added short tutorial how to use the most common header manipulation.
* Update caddy.rst - Improve header manipulation tutorial with the most common usecase, reverse proxying to an upstream webserver with vhosts.
* Update caddy.rst - Format fix
* Update caddy.rst - Add new fields for forward_auth support
* Update caddy.rst - Add configuration example for Authelia
* Update caddy.rst - Reformat doc
* Update caddy.rst
* Update caddy.rst - Again a few typos
* Revert all changes regarding forward_auth in caddy.rst
Since implementing this feature properly would take a redesign how the current handle/reverse_proxy structure works, it is unfeasible for now.
I am unsure the usecase is really there either. With basic_auth implemented, it's far easier to restrict access in a less convoluted way.
Combining basic_auth with http logs and crowdsec, makes bruteforcing also impossible, IP addresses are banned quite swiftly.
* Update source/manual/how-tos/caddy.rst - Typo
Co-authored-by: Dany Marcoux <github@dmarcoux.com>
* Update source/manual/how-tos/caddy.rst - Typo
Co-authored-by: Dany Marcoux <github@dmarcoux.com>
---------
Co-authored-by: Dany Marcoux <github@dmarcoux.com>
Go to `Firewall - Rules - LAN` and create the same rules for the `LAN` interface. Now external and internal clients can connect to Caddy, and Let's Encrypt or ZeroSSL certificates will be issued automatically.
@ -81,11 +82,11 @@ FAQ
---
* A DNS Provider is not required. With a static WAN IP, just skip the DNS Provider configuration and don't check the DNS-01 and Dynamic DNS checkboxes. Let's Encrypt will work with HTTP-01 (Port 80) or TLS-ALPN-01 (Port 443) challenge automatically.
* Port Forwards, NAT Reflection or Split Horizon DNS are not required. Only create Firewall rules that allow traffic to hit the ports that Caddy opens. That is 80 (optionally) and 443 (required). If only Port 443 is opened, and IPv6 is available, make sure the Firewall rule allows IPv6 traffic to reach Caddy on WAN.
* Firewall rules to allow Caddy to reach Backend Servers are not required. OPNsense has a default rule that allows all traffic originating from it to be allowed.
* ACME Clients on reverse proxied Backend Servers won't be able to issue certificates. Caddy intercepts ``/.well-known/acme-challenge``. Either configure the DNS-01 challenge on these servers, use a self-signed certificate, or turn off TLS. In trusted networks, TLS is usually not needed. Caddy is primarily a `TLS Termination Proxy`.
* When using Caddy with IPv6, it's best to have a GUA (Global Unicast Address) on the WAN interface.
* Let's Encrypt or ZeroSSL can't be explicitely chosen. Caddy automatically issues one of these options, determined by speed and availability.
* Port Forwards, NAT Reflection or Split Horizon DNS are not required. Only create Firewall rules that allow traffic to hit the ports that Caddy opens. They are TCP/UDP 80 and 443.
* Firewall rules to allow Caddy to reach upstream destinations are not required. OPNsense has a default rule that allows all traffic originating from it to be allowed.
* ACME Clients on reverse proxied upstream destinations won't be able to issue certificates. Caddy intercepts ``/.well-known/acme-challenge``. This can potentially be solved by using the `HTTP-01 challenge redirection` option in the advanced mode of domains.
* When using Caddy with IPv6, it's best to have a GUA (Global Unicast Address) on the WAN interface, since otherwise the TLS-ALPN-01 challenge might fail.
* Let's Encrypt or ZeroSSL can't be explicitely chosen. Caddy automatically issues one of these options, determined by speed and availability. These certificates can be found in ``/var/db/caddy/data/caddy/certificates``.
..Attention:: There is no TCP/UDP stream, load balancing and WAF (Web Application Firewall) support in this plugin. Caddy itself could support these features, but this plugin is focused on ease of configuration. For a business ready Reverse Proxy with WAF functionality, use OPNWAF. For TCP/UDP streaming, use either nginx or ha-proxy.
@ -96,7 +97,7 @@ FAQ
caddy: Configuration
====================
..Note:: Caddy resides in "Services: Caddy Web Server". Some options are hidden in advanced mode.
..Note:: Caddy can be found in "Services: Caddy Web Server". Some options are hidden in advanced mode.
--------------------------
@ -110,7 +111,7 @@ Option Description
**ACME Email** e.g. `info@example.com`, it's optional for receiving Email updates on Let's Encrypt certificates.
**Auto HTTPS**`On (default)` creates automatic Let's Encrypt certificates for all domains that don't have more specific options set, like custom certificates.
**Trusted Proxies** If Cloudflare or another CDN provider is used, create an `Access List` with the IP addresses of that CDN and add it here. Add the same Access List to the domain this CDN tries to reach.
**Abort Connections** This option, when enabled, aborts all connections to the domain that don't match any specified handler or access list. This setting doesn't affect Let's Encrypt's ability to issue certificates, ensuring secure connections regardless of the option's status. If unchecked, the domain remains accessible even without a matching handler, allowing for connectivity and certificate checks, even in the absence of a configured Backend Server. When using Access Lists, enabling this option is recommended to reject unauthorized connections outright. Without this option, unmatched IP addresses will encounter an empty page instead of an explicit rejection, though the Access Lists continue to function and restrict access.
**Abort Connections** This option, when enabled, aborts all connections to the domain that don't match any specified handler or access list. This setting doesn't affect Let's Encrypt's ability to issue certificates, ensuring secure connections regardless of the option's status. If unchecked, the domain remains accessible even without a matching handler, allowing for connectivity and certificate checks, even in the absence of a configured upstream destination. When using Access Lists, enabling this option is recommended to reject unauthorized connections outright. Without this option, unmatched IP addresses will encounter an empty page instead of an explicit rejection, though the Access Lists continue to function and restrict access.
**DNS Provider** Select the DNS provider for the `DNS-01 Challenge` and `Dynamic DNS`. This is optional, since certificates will be requested from Let's Encrypt via HTTP-01 or TLS-ALPN-01 challenge when this option is unset. Needed for wildcard certificates, and for dynamic DNS. To use the DNS-01 challenge and dynamic DNS, enable the checkbox in a domain or subdomain. For more information: https://github.com/caddy-dns
**DNS API Fields** These fields are for the API settings of the chosen DNS Provider. All of these fields can be left empty if they are optional with the chosen provider. The help text in the plugin will list all available providers and their expected configurations. There are additional fields in the advanced mode if DNS providers require more fields for their configurations.
**DNS API Fields** These fields are for the API settings of the chosen DNS Provider. All of these fields can be left empty if they are optional with the chosen provider. The help text in the plugin will list all available providers and their expected configurations. There are additional fields if DNS providers require more fields for their configurations.
**DynDns Check Http** Optionally, enter an URL to test the current IP address of the firewall via HTTP procotol. Generally, this is not needed. Caddy uses default providers to test the current IP addresses. For using a custom one, enter the `https://` link to an IP address testing website.
**DynDns Check Interface** Optionally, select an interface to extract the current IP address of the firewall. At most, one current IPv6 Global Unicast Address and one current IPv4 non-RFC1918 Address will be extracted.
**DynDns Check Interval** Interval to poll for changes of the IP address. The default is 5 minutes. Can be a number between 1 to 1440 minutes.
**DynDns IP Version** Leave on `None` to set IPv4 A-Records and IPv6 AAAA-Records. Select `Ipv4 only` for setting A-Records. Select `IPv6 only` for setting AAAA-Records.
**DynDns Check Interval** Interval to poll for changes of the IP address. The default is 5 minutes. Can be a number between 1 to 1440 minutes.
**DynDns TTL** Set the TTL (time to live) for DNS Records. The default is 1 hour. Can be a number between 1 to 24 hours.
**DynDns Check Http** Optionally, enter an URL to test the current IP address of the firewall via HTTP procotol. Generally, this is not needed. Caddy uses default providers to test the current IP addresses. For using a custom one, enter the `https://` link to an IP address testing website.
**DynDns Check Interface** Optionally, select an interface to extract the current IP address of the firewall. At most, one current IPv6 Global Unicast Address and one current IPv4 non-RFC1918 Address will be extracted.
**Reverse Proxy Domain** Can either be a domain name or an IP address. If a domain name is chosen, Caddy will automatically try to get a Let's Encrypt or ZeroSSL certificate, and the headers and real IP address will be automatically passed to the Backend Server.
**Reverse Proxy Port** Should be the port the OPNsense will listen on. Don't forget to create Firewall rules that allow traffic to this port on ``WAN`` and ``LAN`` to destination ``This Firewall``. Leave this empty if the default ports of Caddy (`80` and `443`) should be used with automatic redirection from HTTP to HTTPS.
**Access List** Restrict the access to this domain to a list of IP addresses defined in the Access Tab. This doesn't influence Let's Encrypt certificate generation.
**Basic Auth** Restrict the access to this domain to one or multiple users defined in the Access Tab. This doesn't influence the Let's Encrypt certificate generation.
**DNS-01 challenge** Enable this for using DNS-01 instead of HTTP-01 and TLS-ALPN-01 challenge. This can be set per entry, so both types of challenges can be used at the same time for different entries. This option needs the `General Settings - DNS Provider` configured.
**Dynamic DNS** Enable Dynamic DNS. As the option above, the DNS Provider is a requirement. The DNS Records of this domain will be automatically updated with the chosen DNS Provider.
**Custom Certificate** Use a certificate imported or generated in `System - Trust - Certificates`. The chain is generated automatically. Certificate + Intermediate CA + Root CA, Certificate + Root CA and self signed Certificate are all fully supported. Only SAN certificates will work.
**HTTP Access Log** Enable the HTTP request logging for this domain and its subdomains. This option is mostly for troubleshooting or log analyzing tools like CrowdSec, since it will log every single request.
**Description** The description is mandatory. Create descriptions for each domain. Since there could be multiples of the same domain with different ports, do it like this: ``foo.example.com`` and ``foo.example.com.8443``.
**Domain** Can either be a domain name or an IP address. If a domain name is chosen, Caddy will automatically try to get a Let's Encrypt or ZeroSSL certificate, and the headers and real IP address will be automatically passed to the upstream destination.
**Port** Should be the port the OPNsense will listen on. Don't forget to create Firewall rules that allow traffic to this port on ``WAN`` and ``LAN`` to destination ``This Firewall``. Leave this empty if the default ports of Caddy (`80` and `443`) should be used with automatic redirection from HTTP to HTTPS.
**Description** The description is mandatory. Create descriptions for each domain. Since there could be multiples of the same domain with different ports, do it like this: ``foo.example.com`` and ``foo.example.com.8443``.
**>DNS** DNS options
**Dynamic DNS** Enable Dynamic DNS. As the option above, the DNS Provider is a requirement. The DNS Records of this domain will be automatically updated with the chosen DNS Provider.
**>Trust** Certificate options
**DNS-01 challenge** Enable this for using DNS-01 instead of HTTP-01 and TLS-ALPN-01 challenge. This can be set per entry, so both types of challenges can be used at the same time for different entries. This option needs the `General Settings - DNS Provider` configured.
**HTTP-01 challenge redirection** Enter a domain name or IP address. The HTTP-01 challenge will be redirected to that destination. This enables a server behind Caddy to serve ``/.well-known/acme-challenge/``. Caddy will issue a certificate for the same domain using the TLS-ALPN-01 challenge or DNS-01 challenge instead. Please note that his is a complex scenario, Caddy can *only* continue to get automatic certificates if it can listen on Port 443 - so either specify 443 directly or leave the Port empty. Having the domain listen on any other port than 443 will mean the TLS-ALPN-01 challenge will fail too, and there won't be any automatic certificates. If the requirement is a different port than 443, the DNS-01 challenge will remain the only option.
**Custom Certificate** Use a certificate imported or generated in `System - Trust - Certificates`. The chain is generated automatically. Certificate + Intermediate CA + Root CA, Certificate + Root CA and self signed Certificate are all fully supported. Only SAN certificates will work.
**>Access** Access options
**Access List** Restrict the access to this domain to a list of IP addresses defined in the Access Tab. This doesn't influence Let's Encrypt certificate generation.
**Basic Auth** Restrict the access to this domain to one or multiple users defined in the Access Tab. This doesn't influence the Let's Encrypt certificate generation.
**HTTP Access Log** Enable the HTTP request logging for this domain and its subdomains. This option is mostly for troubleshooting or log analyzing tools like CrowdSec, since it will log every single request.
..Note:: For the other options refer to `Reverse Proxy - Domains`. It's best to leave `Access Lists` and `Basic Auth` unconfigured in wildcard domains, and set these per subdomain.
**Reverse Proxy Subdomain** Select a subdomain. This will put the handler on the subdomain instead of the domain. Use only with wildcard domains and subdomains.
**Domain** Select a domain.
**Subdomain** Select a subdomain. This will put the handler on the subdomain instead of the domain. Use only with wildcard domains and subdomains.
**Handle Type**`handle` or `handle path` can be chosen. If in doubt, always use `handle`, the most common option. `handle path` is used to strip the path from the URI.
**Handle Path** Leave this empty to create a catch all location or enter a location like `/foo/*` or `/foo/bar*`.
**Backend Server Domain** Should be an internal domain name or an IP Address of the Backend Server that should receive the reverse proxied traffic.
**Backend Server Port** Should be the port the Backend Server listens on. This can be left empty to use Caddy default port 80.
**Backend Server Path** In case the backend application resides in a sub-path of the web root and its path shouldn't be visible in the frontend URL, this setting can be used to prepend an initial path starting with '/' to every backend request. Java applications running in a servlet container like Tomcat are known to behave this way, so set it to e.g. '/guacamole' to access Apache Guacamole at the frontend root URL without needing a redirect.
**TLS** If the Backend Server only accepts HTTPS, enable this option. If the Backend Server has a globally trusted certificate, this TLS option is the only needed one.
**TLS Trusted CA Certificates** Choose a CA certificate to trust for the Backend Server connection. Import a self-signed certificate or a CA certificate into the OPNsense `System - Trust - Authorities` store, and select it here.
**TLS Server Name** If the SAN (Subject Alternative Name) of the offered trusted CA certificate or self-signed certificate doesn't match with the IP address or hostname of the `Backend Server Domain`, enter it here. This will change the SNI (Server Name Identification) of Caddy to the `TLS Server Name`. IP address e.g. ``192.168.1.1`` or hostname e.g. ``localhost`` or ``opnsense.local`` are all valid choices. Only if the SAN and SNI match, the TLS connection will work, otherwise an error is logged that can be used to troubleshoot.
**NTLM** If the Backend Server needs NTLM authentication, enable this option together with TLS. For example, Exchange Server.
**>Header** Header options
**Header Manipulation** Select one or multiple header manipulations. These will be set to this handler.
**>Upstream** Upstream options
**Upstream Domain** Should be an internal domain name or an IP Address of the upstream destination that should receive the reverse proxied traffic.
**Upstream Port** Should be the port the upstream destination listens on. This can be left empty to use Caddy default port 80.
**Upstream Path** When using "reverse_proxy" (default), in case the backend application resides in a sub-path of the web root and its path shouldn't be visible in the frontend URL, this setting can be used to prepend an initial path starting with '/' to every backend request. Java applications running in a servlet container like Tomcat are known to behave this way, so set it to e.g. '/guacamole' to access Apache Guacamole at the frontend root URL without needing a redirect.
**>Trust** Certificate options
**TLS** If the upstream destination only accepts HTTPS, enable this option. If the upstream destination has a globally trusted certificate, this TLS option is the only needed one.
**NTLM** If the upstream destination needs NTLM authentication, enable this option together with TLS. For example: Exchange Server.
**TLS Insecure Skip Verify** Turns off TLS handshake verification, making the connection insecure and vulnerable to man-in-the-middle attacks. Do not use in production.
**TLS Trusted CA Certificates** Choose a CA certificate to trust for the upstream destination connection. Import a self-signed certificate or a CA certificate into the OPNsense `System - Trust - Authorities` store, and select it here.
**TLS Server Name** If the SAN (Subject Alternative Name) of the offered trusted CA certificate or self-signed certificate doesn't match with the IP address or hostname of the `Upstream Domain`, enter it here. This will change the SNI (Server Name Identification) of Caddy to the `TLS Server Name`. IP address e.g. ``192.168.1.1`` or hostname e.g. ``localhost`` or ``opnsense.local`` are all valid choices. Only if the SAN and SNI match, the TLS connection will work, otherwise an error is logged that can be used to troubleshoot.
..Attention:: Only use `TLS Insecure Skip Verify` if absolutely necessary. Using it makes the connection to the Backend Server insecure. It might look like an easy way out for all kinds of certiciate issues, but in the end it is always a bad choice and proper certificate handling is strongly preferred. Please use the `TLS`, `TLS Trusted CA Certificates` and `TLS Server Name` options instead to get a **secure TLS connection** to the Backend Server. Another option is to use plain HTTP, since it doesn't imply that the connection is secure and encrypted.
..Attention:: Only use `TLS Insecure Skip Verify` if absolutely necessary. Using it makes the connection to the upstream destination insecure. It might look like an easy way out for all kinds of certiciate issues, but in the end it is always a bad choice and proper certificate handling is strongly preferred. Please use the `TLS`, `TLS Trusted CA Certificates` and `TLS Server Name` options instead to get a **secure TLS connection** to the upstream destination. Another option is to use plain HTTP, since it doesn't imply that the connection is secure and encrypted.
**Access List name** Choose a name for the Access List, for example ``private_ips``.
**Client IP Addresses** Enter any number of IPv4 and IPv6 addresses or networks that this access list should contain. For matching only internal networks, add `192.168.0.0/16``172.16.0.0/12``10.0.0.0/8``127.0.0.1/8``fd00::/8``::1`.
**Client IP Addresses** Enter any number of IPv4 and IPv6 addresses or networks that this access list should contain. For matching only internal networks, add ``192.168.0.0/16````172.16.0.0/12````10.0.0.0/8````127.0.0.1/8````fd00::/8````::1``.
**HTTP Response Code** Set a custom HTTP response code that should be returned to the requesting client when the access list doesn't match. Setting this will replace "Abort Connections", all clients will stay connected but will receive the response code. Generally, using "Abort Connections" is recommended, because it will actively disconnect clients without serving anything.
**HTTP Response Message** Set a custom HTTP response message in addition to the HTTP response code.
**Invert List** Invert the logic of the access list. If unchecked, the Client IP Addresses will be allowed. If checked, the Client IP Addresses will be blocked.
..Note:: Go back to domains or subdomains and add the access list to them (advanced mode). All handlers created under these domains will get an additional matcher. That means, the requests still reach Caddy, but if the IP Addresses don't match with the access list, the request will be dropped before being reverse proxied.
..Note:: Go back to domains or subdomains and add the access list to them. All handlers created under these domains will get an additional matcher. That means, the requests still reach Caddy, but if the IP Addresses don't match with the access list, the request will be dropped before being reverse proxied.
..Note:: Basic auth matches after access lists, so set both to first restrict access by IP address, and then additionally by username and password. Don't set basic auth on top of a wildcard domain directly, always set it on the subdomains instead.
**Header**``header_up`` sets, adds (with the + prefix), deletes (with the - prefix), or performs a replacement (by using two arguments, a search and replacement) in a request header going upstream to the backend. ``header_down`` sets, adds (with the + prefix), deletes (with the - prefix), or performs a replacement (by using two arguments, a search and replacement) in a response header coming downstream from the backend. For more information: https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#headers.
**Header Type** Enter a header, for example ``Host``. Use the ``+`` or ``-`` prefix to add or remove this header, for example ``-Host`` or ``+Host``. A suffix match like ``-Host-*`` is also supported. To replace a header, use ``Some-Header`` without ``+`` or ``-``.
**Header Value** Enter a value for the above header. One of the most common options is ``{upstream_hostport}``. It's also possible to use a regular expression to search for a specific value in a header. For example: ``^prefix-([A-Za-z0-9]*)$`` which uses the regular expression language RE2 included in Go.
**Header Replace** If a regular expression is used to search for a `Header Value`, here the replacement string can be set. For example: ``replaced-$1-suffix`` which expands the replacement string, allowing the use of captured values, ``$1`` being the first capture group.
..Attention:: Setting headers to handlers should be considered an advanced option for experts. Please don't set them without any reason. Caddy uses safe defaults. https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#defaults
================
caddy: Tutorials
================
@ -263,18 +291,29 @@ Go to `Services - Caddy Web Server - General Settings`
Go to `Services - Caddy Web Server - Reverse Proxy - Domains`
..Note:: Leave all other fields to default or empty. After just a few seconds the Let's Encrypt certificate will be installed and the reverse proxy works. Check the Logfile for that. Now the TLS Termination reverse proxy is configured.
..Note:: After just a few seconds the Let's Encrypt certificate will be installed and the reverse proxy works. Check the Logfile for that. Now the TLS Termination reverse proxy is configured.
..Note:: Now Caddy listens on Port 80 and 443, and reverse proxies everything from mydomain.duckdns.org to 192.168.1.1:80. All headers and the real IP are automatically passed to the Backend Server. For different ports, check the advanced settings. Let's Encrypt Certificate and Dynamic DNS Updates are all handled automatically.
..Note:: Now Caddy listens on Port 80 and 443, and reverse proxies everything from mydomain.duckdns.org to 192.168.1.1:80. All headers and the real IP are automatically passed to the upstream destination. Let's Encrypt Certificate and Dynamic DNS Updates are all handled automatically.
---------------------------------
@ -328,16 +365,18 @@ Creating a wildcard reverse proxy
Go to `Services - Caddy Web Server - General Settings - DNS Provider`
* Select one of the supported DNS Providers from the list
* Input the `DNS API Key`, and any number of the additional required fields in advanced mode. Read the full help for details.
* Input the `DNS API Key`, and any number of the additional required fields in `Additional Fields`. Read the full help for details.
Go to `Services - Caddy Web Server - Reverse Proxy – Domains`
* Create ``*.example.com`` as domain and activate the `DNS-01` checkbox. A DNS Provider has to be configured. Alternatively, use a certificate imported or generated in `System - Trust - Certificates`. It has to be a wildcard certificate.
* Create ``*.example.com`` as domain and activate the `DNS-01` checkbox. Alternatively, use a certificate imported or generated in `System - Trust - Certificates`. It has to be a wildcard certificate.
* Create all subdomains in relation to the ``*.example.com`` domain. So for example ``foo.example.com`` and ``bar.example.com``.
Go to `Services - Caddy Web Server - Reverse Proxy – Handlers`
* Create a Handler with ``*.example.com`` as domain and ``foo.example.com`` as subdomain. All the same configuration as with normal domains is possible.
* Create a Handler with ``*.example.com`` as domain and ``foo.example.com`` as subdomain. Mostly the same configuration as with normal domains is possible. There are some features that are only possible with normal domains.
..Tip:: If in doubt, don't use subdomains. If there should be ``foo.example.com``, ``bar.example.com`` and ``example.com``, just create them as three normal domains. This way, there is the most flexibility, and the most features are supported.
--------------------------------
@ -347,28 +386,121 @@ Reverse proxy the OPNsense WebUI
* Open the OPNsense WebUI in a Browser (e.g. Chrome or Firefox). Inspect the certificate. Copy the SAN for later use, for example ``OPNsense.localdomain``.
* Save the certificate as .pem file. Open it up with a text editor, and copy the contents into a new entry in `System - Trust - Authorities`. Name the certificate ``opnsense-selfsigned``.
* Add a new Domain in Caddy, for example ``opn.example.com``. Make sure the name is externally resolvable to the WAN IP of the OPNsense.
* Add a new Handler with the following options (enable advanced mode):
* Input ``opn.example.com`` in `Alternate Hostnames` to prevent the error `The HTTP_REFERER "https://opn.example.com/" does not match the predefined settings` after logging in.
* Press **Save**
..Note:: Open ``https://opn.example.com`` and it should serve the reverse proxied OPNsense WebUI. Check the log file for errors if it doesn't work, most of the time the TLS Server Name doesn't match the SAN of the `TLS Trusted CA Certificate`. Caddy doesn't support CN (Common Name) in certificate since it's been deprecated since many years. Only SAN certificates work.
..Attention:: Create an access list to restrict access to the WebUI. Add that access list to this domain.
-------------------------------
Redirect ACME HTTP-01 challenge
-------------------------------
Sometimes an application behind Caddy uses its own ACME Client to get certificates, most likely with the HTTP-01 challenge. This plugin has a built in mechanism to redirect this challenge type easily to a destination behind it.
..Note:: Make sure the chosen domain is externally resolvable. Create an A-Record with an external DNS Provider that points to the external IP Address of the OPNsense. In case of IPv6 availability, it is mandatory to create an AAAA-Record too, otherwise the TLS-ALPN-01 challenge might fail.
..Attention:: It is mandatory that the domain in Caddy uses an empty port or 443 in the GUI, otherwise it can't use the TLS-ALPN-01 challenge for itself. The upstream destination has to listen on Port 80 and serve ``/.well-known/acme-challenge/``, for the same domain that is configured in Caddy.
Go to `Services - Caddy Web Server - Reverse Proxy - Domains`
..Note:: With this configuration, Caddy will eventually choose the TLS-ALPN-01 challenge for its own ``foo.example.com`` domain, and reverse proxy the HTTP-01 challenge to ``192.168.10.1``, where the upstream destination can listen on port 80 for ``foo.example.com`` and solve its own challenge for a certificate. With TLS enabled in the Handler, an encrypted connection is automatically possible. The automatic HTTP to HTTPS redirection is also taken care of.
Sometimes it is necessary to alter the host header in order to reverse proxy to another webserver with vhosts. Since Caddy passes the original host header by default (e.g. ``app.external.example.com``), if the upstream destination listens on a different hostname (e.g. ``app.internal.example.com``), it wouldn't be able to serve this request.
Go to `Services - Caddy Web Server - Reverse Proxy - Domains`
* Input ``opn.example.com`` in `Alternate Hostnames` to prevent the error `The HTTP_REFERER "https://opn.example.com/" does not match the predefined settings` after logging in
* Press **Save**
..Note:: Open ``https://opn.example.com`` and it should serve the reverse proxied OPNsense WebUI. Check the log file for errors if it doesn't work, most of the time the TLS Server Name doesn't match the SAN of the `TLS Trusted CA Certificate`. Caddy doesn't support CN (Common Name) in certificate since it's been deprecated since many years. Only SAN certificates work.
..Attention:: Create an access list to restrict access to the WebUI. Add that access list to the domain in advanced mode.
Go to `Services - Caddy Web Server - Reverse Proxy - Headers`
..Tip:: Since (most) headers retain their original value when being proxied, it is often necessary to override the Host header with the configured upstream address when proxying to HTTPS, such that the Host header matches the TLS ServerName value. https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#https
-------------------------------
@ -379,14 +511,13 @@ Integrating Caddy with CrowdSec
Go to `Services - Caddy Web Server - General Settings - Log Settings`
* Enable `advanced mode`
* Enable `Log HTTP Access in JSON Format`
* Press **Save**
Go to `Services - Caddy Web Server - Reverse Proxy – Domains`
* Open each domain that should be monitored by CrowdSec
* Enable `advanced mode`
* Open `Access`
* Enable `HTTP Access Log`
..Note:: Now the HTTP access logs will appear in ``/var/log/caddy/access`` in json format, one file for each domain.
@ -418,5 +549,5 @@ Using custom configuration files
* The Caddyfile has an additional import from the path ``/usr/local/etc/caddy/caddy.d/``. Place custom configuration files inside that adhere to the Caddyfile syntax.
* ``*.global`` files will be imported into the global block of the Caddyfile.
* ``*.conf`` files will be imported at the end of the Caddyfile. Don't forget to test the custom configuration with `caddy run --config /usr/local/etc/caddy/Caddyfile`.
* ``*.conf`` files will be imported at the end of the Caddyfile. Don't forget to test the custom configuration with ``caddy run --config /usr/local/etc/caddy/Caddyfile``.
* With these imports, the full potential of Caddy can be unlocked. The GUI options will remain focused on the reverse proxy.
Monviech
4 weeks ago
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