summaryrefslogtreecommitdiffstats
path: root/krebs/3modules/tinc.nix
blob: dca764f639403100446fd8fac9d53bf4b8f0123d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
with import <stockholm/lib>;
{ config, pkgs, ... }: {
  options.krebs.tinc = mkOption {
    default = {};
    description = ''
      define a tinc network
    '';
    type = types.attrsOf (types.submodule (tinc: {
      options = let
        netname = tinc.config._module.args.name;
      in {

        enable = mkEnableOption "krebs.tinc.${netname}" // { default = true; };

        confDir = mkOption {
          type = types.package;
          default = pkgs.linkFarm "${netname}-etc-tinc"
            (mapAttrsToList (name: path: { inherit name path; }) {
              "hosts" = tinc.config.hostsPackage;
              "tinc.conf" = pkgs.writeText "${netname}-tinc.conf" ''
                Name = ${tinc.config.host.name}
                Interface = ${netname}
                Broadcast = no
                ${concatMapStrings (c: "ConnectTo = ${c}\n") tinc.config.connectTo}
                Port = ${toString tinc.config.host.nets.${netname}.tinc.port}
                ${tinc.config.extraConfig}
              '';
              "tinc-up" = pkgs.writeDash "${netname}-tinc-up" ''
                ${tinc.config.iproutePackage}/sbin/ip link set ${netname} up
                ${tinc.config.tincUp}
              '';
            });
        };

        host = mkOption {
          type = types.host;
          default = config.krebs.build.host;
        };

        netname = mkOption {
          type = types.enum (attrNames tinc.config.host.nets);
          default = netname;
          description = ''
            The tinc network name.
            It is used to name the TUN device and to generate the default value for
            <literal>config.krebs.tinc.retiolum.hosts</literal>.
          '';
        };

        extraConfig = mkOption {
          type = types.str;
          default = "";
          description = ''
            Extra Configuration to be appended to tinc.conf
          '';
        };
        tincUp = mkOption {
          type = types.str;
          default = let
            net = tinc.config.host.nets.${netname};
            iproute = tinc.config.iproutePackage;
          in ''
            ${optionalString (net.ip4 != null) /* sh */ ''
              ${iproute}/sbin/ip -4 addr add ${net.ip4.addr} dev ${netname}
              ${iproute}/sbin/ip -4 route add ${net.ip4.prefix} dev ${netname}
            ''}
            ${optionalString (net.ip6 != null) /* sh */ ''
              ${iproute}/sbin/ip -6 addr add ${net.ip6.addr} dev ${netname}
              ${iproute}/sbin/ip -6 route add ${net.ip6.prefix} dev ${netname}
            ''}
            ${tinc.config.tincUpExtra}
          '';
          defaultText = ''
            ip -4 addr add ‹net.ip4.addr› dev ${netname}
            ip -4 route add ‹net.ip4.prefix› dev ${netname}
            ip -6 addr add ‹net.ip6.addr› dev ${netname}
            ip -6 route add ‹net.ip6.prefix› dev ${netname}
            ${tinc.config.tincUpExtra}
          '';
          description = ''
            tinc-up script to be used. Defaults to setting the
            krebs.host.nets.‹netname›.ip4 and ip6 for the new ips and
            configures forwarding of the respecitive netmask as subnet.
          '';
        };

        tincUpExtra = mkOption {
          type = types.str;
          default = "";
        };

        tincPackage = mkOption {
          type = types.package;
          default = pkgs.tinc_pre;
          description = "Tincd package to use.";
        };

        hosts = mkOption {
          type = with types; attrsOf host;
          default =
            filterAttrs (_: h: hasAttr tinc.config.netname h.nets) config.krebs.hosts;
          defaultText = "‹all-hosts-of-‹netname››";
          description = ''
            Hosts to generate <literal>config.krebs.tinc.retiolum.hostsPackage</literal>.
            Note that these hosts must have a network named
            <literal>config.krebs.tinc.retiolum.netname</literal>.
          '';
        };

        hostsArchive = mkOption {
          type = types.package;
          default = pkgs.runCommand "retiolum-hosts.tar.bz2" {
            nativeBuildInputs = [ pkgs.gnutar pkgs.coreutils ];
          } ''
            cp \
                --no-preserve=mode \
                --recursive \
                ${tinc.config.hostsPackage} \
                hosts
            tar -cjf $out hosts
          '';
          readOnly = true;
        };

        hostsPackage = mkOption {
          type = types.package;
          default = pkgs.stdenv.mkDerivation {
            name = "${tinc.config.netname}-tinc-hosts";
            phases = [ "installPhase" ];
            installPhase = ''
              mkdir $out
              ${concatStrings (mapAttrsToList (_: host: ''
                echo ${shell.escape host.nets."${tinc.config.netname}".tinc.config} \
                  > $out/${shell.escape host.name}
              '') tinc.config.hosts)}
            '';
          };
          defaultText = "‹netname›-tinc-hosts";
          description = ''
            Package of tinc host configuration files.  By default, a package will
            be generated from <literal>config.krebs.‹netname›.hosts</literal>.  This
            option's main purpose is to expose the generated hosts package to other
            modules, like <literal>config.krebs.tinc_graphs</literal>.  But it can
            also be used to provide a custom hosts directory.
          '';
          example = literalExample ''
            (pkgs.stdenv.mkDerivation {
              name = "my-tinc-hosts";
              src = /home/tv/my-tinc-hosts;
              installPhase = "cp -R . $out";
            })
          '';
        };

        iproutePackage = mkOption {
          type = types.package;
          default = pkgs.iproute;
          description = "Iproute2 package to use.";
        };

        privkey = mkOption {
          type = types.absolute-pathname;
          default = toString <secrets> + "/${tinc.config.netname}.rsa_key.priv";
          defaultText = "‹secrets/‹netname›.rsa_key.priv›";
        };

        privkey_ed25519 = mkOption {
          type = types.nullOr types.absolute-pathname;
          default =
            if tinc.config.host.nets.${netname}.tinc.pubkey_ed25519 == null
              then null
              else toString <secrets> + "/${tinc.config.netname}.ed25519_key.priv";
          defaultText = "‹secrets/‹netname›.ed25519_key.priv›";
        };

        connectTo = mkOption {
          type = types.listOf types.str;
          ${if netname == "retiolum" then "default" else null} = [
            "gum"
            "ni"
            "prism"
          ];
          description = ''
            The list of hosts in the network which the client will try to connect
            to.  These hosts should have an 'Address' configured which points to a
            routeable IPv4 or IPv6 address.

            In stockholm this can be done by configuring:
            {
              krebs.hosts.‹host›.nets.‹netname›.via.ip4.addr = external-ip;
              krebs.hosts.‹host›.nets.‹netname›.tinc.port = 1655;
            }
          '';
        };

        user = mkOption {
          type = types.user;
          default = {
            name = tinc.config.netname;
            home = "/var/lib/${tinc.config.user.name}";
          };
          defaultText = {
            name = "‹netname›";
            home = "/var/lib/‹netname›";
          };
        };
      };
    }));
  };

  config = {
    users.users = mapAttrs' (netname: cfg:
      nameValuePair "${netname}" {
        inherit (cfg.user) home name uid;
        createHome = true;
        isSystemUser = true;
        group = netname;
      }
    ) config.krebs.tinc;

    users.groups = mapAttrs' (netname: cfg:
      nameValuePair netname {}
    ) config.krebs.tinc;

    environment.etc = mapAttrs' (netname: cfg:
      nameValuePair "tinc/${netname}" {
        source = cfg.confDir;
      }
    ) config.krebs.tinc;

    krebs.systemd.services = mapAttrs (netname: cfg: {
      serviceConfig.LoadCredential = filter (x: x != "") [
        (optionalString (cfg.privkey_ed25519 != null)
          "ed25519_key:${cfg.privkey_ed25519}"
        )
        "rsa_key:${cfg.privkey}"
      ];
    }) config.krebs.tinc;

    systemd.services = mapAttrs (netname: cfg: {
      description = "Tinc daemon for ${netname}";
      after = [ "network.target" ];
      wantedBy = [ "multi-user.target" ];
      path = [
        cfg.iproutePackage
        cfg.tincPackage
      ];
      reloadIfChanged = true;
      restartTriggers = [ cfg.confDir ];
      serviceConfig = {
        Restart = "always";
        ExecStart = toString [
          "${cfg.tincPackage}/sbin/tincd"
          "-D"
          "-U ${cfg.user.name}"
          "-c /etc/tinc/${netname}"
          "-d 0"
          (optionalString (cfg.privkey_ed25519 != null)
            "-o Ed25519PrivateKeyFile=\${CREDENTIALS_DIRECTORY}/ed25519_key"
          )
          "-o PrivateKeyFile=\${CREDENTIALS_DIRECTORY}/rsa_key"
          "--pidfile=/var/run/tinc.${netname}.pid"
        ];
        ExecReload = "${cfg.tincPackage}/sbin/tinc -n ${netname} reload";
        SyslogIdentifier = netname;
      };
    }) config.krebs.tinc;
  };
}