acme: added option security.acme.preliminarySelfsigned (#15562)
This commit is contained in:
Bob van der Linden
Domen Kožar
parent
164ead312e
commit
4e6697dcb6
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@ -114,6 +114,19 @@ in
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'';
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};
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preliminarySelfsigned = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether a preliminary self-signed certificate should be generated before
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doing ACME requests. This can be useful when certificates are required in
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a webserver, but ACME needs the webserver to make its requests.
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With preliminary self-signed certificate the webserver can be started and
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can later reload the correct ACME certificates.
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'';
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};
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certs = mkOption {
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default = { };
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type = types.loaOf types.optionSet;
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@ -140,54 +153,126 @@ in
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config = mkMerge [
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(mkIf (cfg.certs != { }) {
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systemd.services = flip mapAttrs' cfg.certs (cert: data:
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let
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cpath = "${cfg.directory}/${cert}";
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rights = if data.allowKeysForGroup then "750" else "700";
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cmdline = [ "-v" "-d" cert "--default_root" data.webroot "--valid_min" cfg.validMin ]
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++ optionals (data.email != null) [ "--email" data.email ]
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++ concatMap (p: [ "-f" p ]) data.plugins
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++ concatLists (mapAttrsToList (name: root: [ "-d" (if root == null then name else "${name}:${root}")]) data.extraDomains);
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systemd.services = let
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services = concatLists servicesLists;
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servicesLists = mapAttrsToList certToServices cfg.certs;
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certToServices = cert: data:
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let
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cpath = "${cfg.directory}/${cert}";
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rights = if data.allowKeysForGroup then "750" else "700";
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cmdline = [ "-v" "-d" cert "--default_root" data.webroot "--valid_min" cfg.validMin ]
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++ optionals (data.email != null) [ "--email" data.email ]
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++ concatMap (p: [ "-f" p ]) data.plugins
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++ concatLists (mapAttrsToList (name: root: [ "-d" (if root == null then name else "${name}:${root}")]) data.extraDomains);
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acmeService = {
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description = "Renew ACME Certificate for ${cert}";
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after = [ "network.target" ];
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serviceConfig = {
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Type = "oneshot";
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SuccessExitStatus = [ "0" "1" ];
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PermissionsStartOnly = true;
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User = data.user;
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Group = data.group;
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PrivateTmp = true;
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};
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path = [ pkgs.simp_le ];
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preStart = ''
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mkdir -p '${cfg.directory}'
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if [ ! -d '${cpath}' ]; then
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mkdir '${cpath}'
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fi
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chmod ${rights} '${cpath}'
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chown -R '${data.user}:${data.group}' '${cpath}'
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'';
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script = ''
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cd '${cpath}'
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set +e
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simp_le ${concatMapStringsSep " " (arg: escapeShellArg (toString arg)) cmdline}
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EXITCODE=$?
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set -e
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echo "$EXITCODE" > /tmp/lastExitCode
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exit "$EXITCODE"
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'';
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postStop = ''
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if [ -e /tmp/lastExitCode ] && [ "$(cat /tmp/lastExitCode)" = "0" ]; then
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echo "Executing postRun hook..."
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${data.postRun}
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fi
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'';
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in nameValuePair
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("acme-${cert}")
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({
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description = "Renew ACME Certificate for ${cert}";
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after = [ "network.target" ];
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serviceConfig = {
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Type = "oneshot";
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SuccessExitStatus = [ "0" "1" ];
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PermissionsStartOnly = true;
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User = data.user;
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Group = data.group;
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PrivateTmp = true;
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before = [ "acme-certificates.target" ];
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wantedBy = [ "acme-certificates.target" ];
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};
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selfsignedService = {
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description = "Create preliminary self-signed certificate for ${cert}";
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preStart = ''
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if [ ! -d '${cpath}' ]
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then
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mkdir -p '${cpath}'
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chmod ${rights} '${cpath}'
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chown '${data.user}:${data.group}' '${cpath}'
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fi
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'';
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script =
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''
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# Create self-signed key
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workdir="/run/acme-selfsigned-${cert}"
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${pkgs.openssl.bin}/bin/openssl genrsa -des3 -passout pass:x -out $workdir/server.pass.key 2048
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${pkgs.openssl.bin}/bin/openssl rsa -passin pass:x -in $workdir/server.pass.key -out $workdir/server.key
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${pkgs.openssl.bin}/bin/openssl req -new -key $workdir/server.key -out $workdir/server.csr \
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-subj "/C=UK/ST=Warwickshire/L=Leamington/O=OrgName/OU=IT Department/CN=example.com"
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${pkgs.openssl.bin}/bin/openssl x509 -req -days 1 -in $workdir/server.csr -signkey $workdir/server.key -out $workdir/server.crt
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# Move key to destination
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mv $workdir/server.key ${cpath}/key.pem
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mv $workdir/server.crt ${cpath}/fullchain.pem
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# Clean up working directory
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rm $workdir/server.csr
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rm $workdir/server.pass.key
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# Give key acme permissions
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chmod ${rights} '${cpath}/key.pem'
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chown '${data.user}:${data.group}' '${cpath}/key.pem'
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chmod ${rights} '${cpath}/fullchain.pem'
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chown '${data.user}:${data.group}' '${cpath}/fullchain.pem'
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'';
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serviceConfig = {
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Type = "oneshot";
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RuntimeDirectory = "acme-selfsigned-${cert}";
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PermissionsStartOnly = true;
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User = data.user;
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Group = data.group;
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};
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unitConfig = {
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# Do not create self-signed key when key already exists
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ConditionPathExists = "!${cpath}/key.pem";
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};
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before = [
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"acme-selfsigned-certificates.target"
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];
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wantedBy = [
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"acme-selfsigned-certificates.target"
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];
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};
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in (
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[ { name = "acme-${cert}"; value = acmeService; } ]
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++
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(if cfg.preliminarySelfsigned
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then [ { name = "acme-selfsigned-${cert}"; value = selfsignedService; } ]
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else []
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)
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);
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servicesAttr = listToAttrs services;
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nginxAttr = {
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nginx = {
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after = [ "acme-selfsigned-certificates.target" ];
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wants = [ "acme-selfsigned-certificates.target" "acme-certificates.target" ];
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};
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};
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path = [ pkgs.simp_le ];
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preStart = ''
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mkdir -p '${cfg.directory}'
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if [ ! -d '${cpath}' ]; then
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mkdir '${cpath}'
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fi
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chmod ${rights} '${cpath}'
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chown -R '${data.user}:${data.group}' '${cpath}'
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'';
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script = ''
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cd '${cpath}'
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set +e
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simp_le ${concatMapStringsSep " " (arg: escapeShellArg (toString arg)) cmdline}
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EXITCODE=$?
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set -e
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echo "$EXITCODE" > /tmp/lastExitCode
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exit "$EXITCODE"
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'';
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postStop = ''
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if [ -e /tmp/lastExitCode ] && [ "$(cat /tmp/lastExitCode)" = "0" ]; then
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echo "Executing postRun hook..."
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${data.postRun}
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fi
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'';
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})
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);
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in
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servicesAttr //
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(if config.services.nginx.enable then nginxAttr else {});
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systemd.timers = flip mapAttrs' cfg.certs (cert: data: nameValuePair
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("acme-${cert}")
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@ -200,6 +285,9 @@ in
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};
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})
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);
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systemd.targets."acme-selfsigned-certificates" = mkIf cfg.preliminarySelfsigned {};
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systemd.targets."acme-certificates" = {};
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})
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{ meta.maintainers = with lib.maintainers; [ abbradar fpletz globin ];
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@ -66,4 +66,32 @@ options for the <literal>security.acme</literal> module.</para>
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</section>
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<section><title>Using ACME certificates in Nginx</title>
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<para>In practice ACME is mostly used for retrieval and renewal of
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certificates that will be used in a webserver like Nginx. A configuration for
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Nginx that uses the certificates from ACME for
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<literal>foo.example.com</literal> will look similar to:
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</para>
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<programlisting>
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services.nginx.httpConfig = ''
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server {
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server_name foo.example.com;
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listen 443 ssl;
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ssl_certificate ${config.security.acme.directory}/foo.example.com/fullchain.pem;
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ssl_certificate_key ${config.security.acme.directory}/foo.example.com/key.pem;
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root /var/www/foo.example.com/;
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}
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'';
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</programlisting>
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<para>Now Nginx will try to use the certificates that will be retrieved by ACME.
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ACME needs Nginx (or any other webserver) to function and Nginx needs
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the certificates to actually start. For this reason the ACME module
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automatically generates self-signed certificates that will be used by Nginx to
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start. After that Nginx is used by ACME to retrieve the actual ACME
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certificates. <literal>security.acme.preliminarySelfsigned</literal> can be
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used to control whether to generate the self-signed certificates.
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</para>
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</section>
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</chapter>
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