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diff --git a/doc/guix.texi b/doc/guix.texi index 0d334e302f..21b6d7d886 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -215,6 +215,7 @@ Services * Messaging Services:: Messaging services. * Kerberos Services:: Kerberos services. * Web Services:: Web servers. +* Certificate Services:: TLS certificates via Let's Encrypt. * VPN Services:: VPN daemons. * Network File System:: NFS related services. * Continuous Integration:: The Cuirass service. @@ -8605,6 +8606,7 @@ declaration. * Messaging Services:: Messaging services. * Kerberos Services:: Kerberos services. * Web Services:: Web servers. +* Certificate Services:: TLS certificates via Let's Encrypt. * VPN Services:: VPN daemons. * Network File System:: NFS related services. * Continuous Integration:: The Cuirass service. @@ -13379,6 +13381,84 @@ Whether the server should add its configuration to response. @end table @end deftp + +@node Certificate Services +@subsubsection Certificate Services + +@cindex web +@cindex www +@cindex HTTP +The @code{(gnu services certbot)} module allows Guix systems to +automatically obtain a valid TLS certificate from the Let's Encrypt +certificate authority. These certificates can then be used to serve +content securely over HTTPS or other TLS-based protocols, with the +knowledge that the client will be able to verify the server's +authenticity. + +Let's Encrypt (@url{https://letsencrypt.org/}) provides the +@code{certbot} tool to automate the certification process. This tool +first securely generates a key on the server. It then makes a request +to the Let's Encrypt certificate authority (CA) to sign the key. The CA +checks that the request originates from the host in question by using a +challenge-response protocol, requiring the server to provide its +response over HTTP. If that protocol completes successfully, the CA +signs the key, resulting in a certificate. That certificate is valid +for a limited period of time, and therefore to continue to provide TLS +services, the server needs to periodically ask the CA to renew its +signature. + +The Guix certbot service automates this process: the initial key +generation, the initial certification request to the Let's Encrypt +service, the web server challenge/response integration, writing the +certificate to disk, and the automated periodic renewals. + +@defvr {Scheme Variable} certbot-service-type +A service type for the @code{certbot} Let's Encrypt client. +@end defvr + +@deftp {Data Type} certbot-configuration +Data type representing the configuration of the @code{certbot} serice. +This type has the following parameters: +@table @asis +@item @code{package} (default: @code{certbot}) +The certbot package to use. + +@item @code{webroot} (default: @code{/var/www}) +The directory from which to serve the Let's Encrypt challenge/response +files. + +@item @code{hosts} (default: @code{()}) +A list of hosts for which to generate certificates and request +signatures. + +@item @code{default-location} (default: @i{see below}) +The default @code{nginx-location-configuration}. Because @code{certbot} +needs to be able to serve challenges and responses, it needs to be able +to run a web server. It does so by extending the @code{nginx} web +service with an @code{nginx-server-configuration} listening on the +@var{hosts} on port 80, and which has a +@code{nginx-location-configuration} for the @code{/.well-known/} URI +path subspace used by Let's Encrypt. @xref{Web Services}, for more on +these nginx configuration data types. + +Requests to other URL paths will be matched by the +@code{default-location}, which if present is added to all +@code{nginx-server-configuration}s. + +By default, the @code{default-location} will issue a redirect from +@code{http://@var{host}/...} to @code{https://@var{host}/...}, leaving +you to define what to serve on your site via @code{https}. + +Pass @code{#f} to not issue a default location. +@end table +@end deftp + +The public key and its signatures will be written to +@code{/etc/letsencrypt/live/@var{host}/fullchain.pem}, for each +@var{host} in the configuration. The private key is written to +@code{/etc/letsencrypt/live/@var{host}/privkey.pem}. + + @node VPN Services @subsubsection VPN Services @cindex VPN (virtual private network) |