Subject: [bug#41803] [PATCH] Yggdrasil package and accompanying shepherd service (mesh network)

From: raingloom <[email-masked]>
Date: Thu, 5 Nov 2020 15:43:41 +0100

Final version, hopefully.
Slight upgrade to system example to make testing easier. (added curl to
packages)
>From 2b13fad52d5aeb4c5d2b700cd906b53c98b239ec Mon Sep 17 00:00:00 2001
From: raingloom <[email-masked]>
Date: Thu, 29 Oct 2020 17:10:25 +0100
Subject: [PATCH 1/6] gnu: Added go-github-com-hashicorp-go-syslog.

* gnu/packages/golang.scm (go-github-com-hashicorp-go-syslog): New variable.
---
 gnu/packages/golang.scm | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/gnu/packages/golang.scm b/gnu/packages/golang.scm
index 6ba735c4a2..f9fffadd9d 100644
--- a/gnu/packages/golang.scm
+++ b/gnu/packages/golang.scm
@@ -5933,3 +5933,26 @@ tests.")
     (description
      "This package provides SCSS compiler support for Go applications.")
     (license license:expat)))
+
+(define-public go-github-com-hashicorp-go-syslog
+  (package
+    (name "go-github-com-hashicorp-go-syslog")
+    (version "1.0.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/hashicorp/go-syslog")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "09vccqggz212cg0jir6vv708d6mx0f9w5bxrcdah3h6chgmal6v1"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/hashicorp/go-syslog"))
+    (home-page "https://github.com/hashicorp/go-syslog")
+    (synopsis "Golang syslog wrapper, cross-compile friendly")
+    (description "A very simple wrapper around log/syslog")
+    (license license:expat)))
+
-- 
2.28.0

>From fda7a7767a6c4d18d2b520a77e0e77b32052052f Mon Sep 17 00:00:00 2001
From: raingloom <[email-masked]>
Date: Fri, 23 Oct 2020 02:03:41 +0200
Subject: [PATCH 2/6] gnu: Added go-github-com-hjson-hjson-go.

* gnu/packages/golang.scm (go-github-com-hjson-hjson-go): New variable.
---
 gnu/packages/golang.scm | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/gnu/packages/golang.scm b/gnu/packages/golang.scm
index f9fffadd9d..4f937baa03 100644
--- a/gnu/packages/golang.scm
+++ b/gnu/packages/golang.scm
@@ -5956,3 +5956,27 @@ tests.")
     (description "A very simple wrapper around log/syslog")
     (license license:expat)))
 
+(define-public go-github-com-hjson-hjson-go
+  (package
+    (name "go-github-com-hjson-hjson-go")
+    (version "3.1.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/hjson/hjson-go")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "1dfdiahimg6z9idg8jiqxwnlwjnmasbjccx8gnag49cz4yfqskaz"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/hjson/hjson-go"))
+    (home-page "https://hjson.org/")
+    (synopsis "Human JSON implementation for Go")
+    (description "Hjson is a syntax extension to JSON.
+It's intended to be used like a user interface for humans, to read and edit
+before passing the JSON data to the machine.")
+    (license license:expat)))
+
-- 
2.28.0

>From c9538dcf9c8235093b003491f0a542736877ec0c Mon Sep 17 00:00:00 2001
From: raingloom <[email-masked]>
Date: Thu, 5 Nov 2020 14:48:39 +0100
Subject: [PATCH 3/6] gnu: Added go-golang-zx2c4-com-wireguard.

* gnu/packages/golang.scm (go-golang-zx2c4-com-wireguard): New variable.
---
 gnu/packages/golang.scm | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/gnu/packages/golang.scm b/gnu/packages/golang.scm
index 4f937baa03..f478aeda91 100644
--- a/gnu/packages/golang.scm
+++ b/gnu/packages/golang.scm
@@ -5980,3 +5980,32 @@ It's intended to be used like a user interface for humans, to read and edit
 before passing the JSON data to the machine.")
     (license license:expat)))
 
+(define-public go-golang-zx2c4-com-wireguard
+  (package
+    (name "go-golang-zx2c4-com-wireguard")
+    (version "0.0.20200320")
+    (source
+     (origin
+       (method git-fetch)
+       ;; NOTE: module URL is a redirect
+       ;; target: git.zx2c4.com/wireguard-go
+       ;; source: golang.zx2c4.com/wireguard
+       (uri (git-reference
+             (url "https://git.zx2c4.com/wireguard-go/")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "0fy4qsss3i3pkq1rpgjds4aipbwlh1dr9hbbf7jn2a1c63kfks0r"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "golang.zx2c4.com/wireguard"))
+    (propagated-inputs
+     `(("go-golang-org-x-crypto" ,go-golang-org-x-crypto)
+       ("go-golang-org-x-net" ,go-golang-org-x-net)
+       ("go-golang-org-x-sys" ,go-golang-org-x-sys)
+       ("go-golang-org-x-text" ,go-golang-org-x-text)))
+    (home-page "https://git.zx2c4.com/wireguard")
+    (synopsis "This is an implementation of WireGuard in Go")
+    (description "Go Implementation of [WireGuard](https://www.wireguard.com/)")
+    (license license:expat)))
-- 
2.28.0

>From 4ef72e6c67df5178fb0f21b1f465492232ddc169 Mon Sep 17 00:00:00 2001
From: raingloom <[email-masked]>
Date: Sat, 17 Oct 2020 20:56:53 +0200
Subject: [PATCH 4/6] gnu: Add go-github-com-kardianos-minwinsvc.

* gnu/packages/golang.scm (go-github-com-kardianos-minwinsvc): New variable.
---
 gnu/packages/golang.scm | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/gnu/packages/golang.scm b/gnu/packages/golang.scm
index f478aeda91..524638d212 100644
--- a/gnu/packages/golang.scm
+++ b/gnu/packages/golang.scm
@@ -6009,3 +6009,29 @@ before passing the JSON data to the machine.")
     (synopsis "This is an implementation of WireGuard in Go")
     (description "Go Implementation of [WireGuard](https://www.wireguard.com/)")
     (license license:expat)))
+
+(define-public go-github-com-kardianos-minwinsvc
+  (package
+    (name "go-github-com-kardianos-minwinsvc")
+    (version "1.0.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/kardianos/minwinsvc")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "0z941cxymkjcsj3p5l3g4wm2da3smz7iyqk2wbs5y8lmxd4kfzd8"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/kardianos/minwinsvc"))
+    (home-page "https://github.com/kardianos/minwinsvc/")
+    ;; some packages (Yggdrasil) need it to compile
+    ;; it's a tiny package and it's easier to bundle it than to patch it out
+    (synopsis "Minimal windows only service stub for Go")
+    (description "Go programs designed to run from most *nix style operating
+systems can import this package to enable running programs as services without
+modifying them.")
+    (license license:zlib)))
-- 
2.28.0

>From cc491ae855c8f98c6605b1af32061c45ecfdb80c Mon Sep 17 00:00:00 2001
From: raingloom <[email-masked]>
Date: Sat, 17 Oct 2020 20:57:57 +0200
Subject: [PATCH 5/6] gnu: Added yggdrasil.

* gnu/packages/networking.scm (yggdrasil): New variable.
* gnu/packages/patches/yggdrasil-extra-config.patch: New file.
* gnu/local.mk (dist_PATCH_DATA): Add it.
---
 gnu/local.mk                                  |  1 +
 gnu/packages/networking.scm                   | 94 +++++++++++++++++++
 .../patches/yggdrasil-extra-config.patch      | 86 +++++++++++++++++
 3 files changed, 181 insertions(+)
 create mode 100644 gnu/packages/patches/yggdrasil-extra-config.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index 2a994bd3b9..619eab061d 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1724,6 +1724,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/xsane-fix-snprintf-buffer-length.patch	\
   %D%/packages/patches/xsane-support-ipv6.patch			\
   %D%/packages/patches/xsane-tighten-default-umask.patch	\
+  %D%/packages/patches/yggdrasil-extra-config.patch	\
   %D%/packages/patches/zziplib-CVE-2018-16548.patch
 
 MISC_DISTRO_FILES =				\
diff --git a/gnu/packages/networking.scm b/gnu/packages/networking.scm
index cf1909ff28..ef746c4897 100644
--- a/gnu/packages/networking.scm
+++ b/gnu/packages/networking.scm
@@ -97,6 +97,7 @@
   #:use-module (gnu packages glib)
   #:use-module (gnu packages gnome)
   #:use-module (gnu packages gnupg)
+  #:use-module (gnu packages golang)
   #:use-module (gnu packages graphviz)
   #:use-module (gnu packages gstreamer)
   #:use-module (gnu packages gtk)
@@ -3813,3 +3814,96 @@ stamps.")
 client and server.  It allows you to use remote block devices over a TCP/IP
 network.")
     (license license:gpl2)))
+
+(define-public yggdrasil
+  (package
+    (name "yggdrasil")
+    (version "0.3.15")
+    (source
+     (origin
+       (method git-fetch)
+       (uri
+        (git-reference
+         (url "https://github.com/yggdrasil-network/yggdrasil-go")
+         (commit (string-append "v" version))
+         (recursive? #t)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "0gk7gy8yq5nrnblv4imxzzm2hac4ri0hlw19ajfbc1zll5kj32gf"))
+       (patches (search-patches "yggdrasil-extra-config.patch"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/yggdrasil-network/yggdrasil-go"
+       ;; TODO: figure out how tests are run
+       #:tests? #f
+       #:install-source? #f
+       #:phases (modify-phases %standard-phases
+                  (replace 'build
+                    (lambda _
+                      (for-each
+                       (lambda (c)
+                         (invoke
+                          "go" "build" "-v" "-ldflags=-s -w"
+                          (string-append
+                           "github.com/yggdrasil-network/yggdrasil-go/cmd/" c)))
+                       (list "yggdrasil" "yggdrasilctl"))
+                      #t))
+                  (replace 'install
+                    (lambda* (#:key outputs #:allow-other-keys)
+                      (let* ((out (assoc-ref outputs "out"))
+                             (bin (string-append out "/bin/"))
+                             (doc (string-append out "/share/doc/yggdrasil/")))
+                        (mkdir-p bin)
+                        (for-each
+                         (lambda (f)
+                           (install-file f bin))
+                         (list "yggdrasil" "yggdrasilctl"))
+                        (mkdir-p doc)
+                        (copy-recursively
+                         (string-append
+                          "src/github.com/yggdrasil-network/yggdrasil-go/"
+                          "doc/yggdrasil-network.github.io")
+                         doc)))))))
+    ;; https://github.com/kardianos/minwinsvc is windows only
+    (propagated-inputs
+     `(("go-github-com-arceliar-phony" ,go-github-com-arceliar-phony)
+       ("go-github-com-cheggaaa-pb" ,go-github-com-cheggaaa-pb)
+       ("go-github-com-gologme-log" ,go-github-com-gologme-log)
+       ("go-github-com-hashicorp-go-syslog" ,go-github-com-hashicorp-go-syslog)
+       ("go-github-com-hjson-hjson-go" ,go-github-com-hjson-hjson-go)
+       ("go-github-com-kardianos-minwinsvc" ,go-github-com-kardianos-minwinsvc)
+       ("go-github-com-mitchellh-mapstructure"
+        ,go-github-com-mitchellh-mapstructure)
+       ("go-golang-org-x-crypto" ,go-golang-org-x-crypto)
+       ("go-golang-org-x-net" ,go-golang-org-x-net)
+       ("go-golang-org-x-text" ,go-golang-org-x-text)
+       ("go-golang-zx2c4-com-wireguard" ,go-golang-zx2c4-com-wireguard)
+       ("go-netlink" ,go-netlink)
+       ("go-netns" ,go-netns)))
+    (home-page "https://yggdrasil-network.github.io/blog.html")
+    (synopsis
+     "Experiment in scalable routing as an encrypted IPv6 overlay network")
+    (description
+     "Yggdrasil is an early-stage implementation of a fully end-to-end encrypted
+IPv6 network.  It is lightweight, self-arranging, supported on multiple
+platforms and allows pretty much any IPv6-capable application to communicate
+securely with other Yggdrasil nodes.  Yggdrasil does not require you to have
+IPv6 Internet connectivity - it also works over IPv4.")
+    (license
+     ;; As a special exception to the GNU Lesser General Public License
+     ;; version 3 ("LGPL3"), the copyright holders of this Library give you
+     ;; permission to convey to a third party a Combined Work that links
+     ;; statically or dynamically to this Library without providing any Minimal
+     ;; Corresponding Source or Minimal Application Code as set out in 4d or
+     ;; providing the installation information set out in section 4e, provided
+     ;; that you comply with the other provisions of LGPL3 and provided that you
+     ;; meet, for the Application the terms and conditions of the license(s)
+     ;; which apply to the Application. Except as stated in this special
+     ;; exception, the provisions of LGPL3 will continue to comply in full to
+     ;; this Library. If you modify this Library, you may apply this exception
+     ;; to your version of this Library, but you are not obliged to do so. If
+     ;; you do not wish to do so, delete this exception statement from your
+     ;; version. This exception does not (and cannot) modify any license terms
+     ;; which apply to the Application, with which you must still comply
+     license:lgpl3)))
diff --git a/gnu/packages/patches/yggdrasil-extra-config.patch b/gnu/packages/patches/yggdrasil-extra-config.patch
new file mode 100644
index 0000000000..c21ca29a84
--- /dev/null
+++ b/gnu/packages/patches/yggdrasil-extra-config.patch
@@ -0,0 +1,86 @@
+diff --git a/cmd/yggdrasil/main.go b/cmd/yggdrasil/main.go
+index 813e950..08d35cc 100644
+--- a/cmd/yggdrasil/main.go
++++ b/cmd/yggdrasil/main.go
+@@ -40,11 +40,12 @@ type node struct {
+ 	admin     module.Module // admin.AdminSocket
+ }
+ 
+-func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *config.NodeConfig {
++func readConfig(useconf *bool, useconffile *string, extraconffile *string, normaliseconf *bool) *config.NodeConfig {
+ 	// Use a configuration file. If -useconf, the configuration will be read
+ 	// from stdin. If -useconffile, the configuration will be read from the
+ 	// filesystem.
+ 	var conf []byte
++	var extraconf []byte
+ 	var err error
+ 	if *useconffile != "" {
+ 		// Read the file from the filesystem
+@@ -56,6 +57,21 @@ func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *config
+ 	if err != nil {
+ 		panic(err)
+ 	}
++	if *extraconffile != "" {
++		extraconf, err = ioutil.ReadFile(*extraconffile);
++	}
++	if err != nil {
++		panic(err)
++	}
++	// Generate a new configuration - this gives us a set of sane defaults -
++	// then parse the configuration we loaded above on top of it. The effect
++	// of this is that any configuration item that is missing from the provided
++	// configuration will use a sane default.
++	cfg := config.GenerateConfig()
++	var confs [2][]byte
++	confs[0]=conf
++	confs[1]=extraconf
++	for _, conf := range confs { if len(conf)>0 {
+ 	// If there's a byte order mark - which Windows 10 is now incredibly fond of
+ 	// throwing everywhere when it's converting things into UTF-16 for the hell
+ 	// of it - remove it and decode back down into UTF-8. This is necessary
+@@ -69,11 +85,6 @@ func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *config
+ 			panic(err)
+ 		}
+ 	}
+-	// Generate a new configuration - this gives us a set of sane defaults -
+-	// then parse the configuration we loaded above on top of it. The effect
+-	// of this is that any configuration item that is missing from the provided
+-	// configuration will use a sane default.
+-	cfg := config.GenerateConfig()
+ 	var dat map[string]interface{}
+ 	if err := hjson.Unmarshal(conf, &dat); err != nil {
+ 		panic(err)
+@@ -112,6 +123,7 @@ func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *config
+ 	if err = mapstructure.Decode(dat, &cfg); err != nil {
+ 		panic(err)
+ 	}
++	}}
+ 	return cfg
+ }
+ 
+@@ -164,6 +176,7 @@ func main() {
+ 	genconf := flag.Bool("genconf", false, "print a new config to stdout")
+ 	useconf := flag.Bool("useconf", false, "read HJSON/JSON config from stdin")
+ 	useconffile := flag.String("useconffile", "", "read HJSON/JSON config from specified file path")
++	extraconffile := flag.String("extraconffile", "", "extra (usually private) HJSON/JSON config from specified file path")
+ 	normaliseconf := flag.Bool("normaliseconf", false, "use in combination with either -useconf or -useconffile, outputs your configuration normalised")
+ 	confjson := flag.Bool("json", false, "print configuration from -genconf or -normaliseconf as JSON instead of HJSON")
+ 	autoconf := flag.Bool("autoconf", false, "automatic mode (dynamic IP, peer with IPv6 neighbors)")
+@@ -187,7 +200,7 @@ func main() {
+ 		cfg = config.GenerateConfig()
+ 	case *useconffile != "" || *useconf:
+ 		// Read the configuration from either stdin or from the filesystem
+-		cfg = readConfig(useconf, useconffile, normaliseconf)
++		cfg = readConfig(useconf, useconffile, extraconffile, normaliseconf)
+ 		// If the -normaliseconf option was specified then remarshal the above
+ 		// configuration and print it back to stdout. This lets the user update
+ 		// their configuration file with newly mapped names (like above) or to
+@@ -332,7 +345,7 @@ func main() {
+ 			goto exit
+ 		case _ = <-r:
+ 			if *useconffile != "" {
+-				cfg = readConfig(useconf, useconffile, normaliseconf)
++				cfg = readConfig(useconf, useconffile, extraconffile, normaliseconf)
+ 				logger.Infoln("Reloading configuration from", *useconffile)
+ 				n.core.UpdateConfig(cfg)
+ 				n.tuntap.UpdateConfig(cfg)
-- 
2.28.0

From d7fd649df7902e7eabe8a7d0aa3ab156e4898b71 Mon Sep 17 00:00:00 2001
From: raingloom <[email-masked]>
Date: Thu, 11 Jun 2020 14:09:57 +0200
Subject: [PATCH 6/6] services: Added yggdrasil-service-type.

* gnu/services/networking.scm:
  (yggdrasil-configuration
  yggdrasil-configuration?
  yggdrasil-configuration-package
  yggdrasil-configuration-auto-conf
  yggdrasil-configuration-log-level
  yggdrasil-configuration-log-to): New procedures.
  (yggdrasil-service-type): New variable.
* doc/guix.texi: Document it.
* gnu/system/examples/yggdrasil.tmpl: Provide example.
---
 doc/guix.texi                      |  81 ++++++++++++++++++++
 gnu/services/networking.scm        | 117 ++++++++++++++++++++++++++++-
 gnu/system/examples/yggdrasil.tmpl |  60 +++++++++++++++
 3 files changed, 257 insertions(+), 1 deletion(-)
 create mode 100644 gnu/system/examples/yggdrasil.tmpl

diff --git a/doc/guix.texi b/doc/guix.texi
index b7f1bc1f00..e099f5ce43 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -82,6 +82,7 @@ Copyright @copyright{} 2020 Pierre Langlois@*
 Copyright @copyright{} 2020 pinoaffe@*
 Copyright @copyright{} 2020 André Batista@*
 Copyright @copyright{} 2020 Alexandru-Sergiu Marton@*
+Copyright @copyright{} 2020 raingloom@*
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -16848,6 +16849,86 @@ Use this to add additional options and manage shared secrets out-of-band.
 @end table
 @end deftp
 
+@defvr {Scheme Variable} yggdrasil-service-type
+The service type for connecting to the @uref{https://yggdrasil-network.github.io/, Yggdrasil network}, an early-stage implementation of a fully end-to-end encrypted IPv6 network.
+
+@quotation
+Yggdrasil provides name-independent routing with cryptographically generated addresses. Static addressing means you can keep the same address as long as you want, even if you move to a new location, or generate a new address (by generating new keys) whenever you want.
+@uref{https://yggdrasil-network.github.io/2018/07/28/addressing.html}
+@end quotation
+
+Pass it a value of @code{yggdrasil-configuration} to connect it to public peers and/or local peers.
+
+Here is an example using public peers and a static address. The static signing and encryption keys are defined in @file{/etc/yggdrasil-private.conf} (the default value for @code{config-file}).
+
+@lisp
+;; part of the operating-system declaration
+(service yggdrasil-service-type
+              (yggdrasil-configuration
+               (autoconf? #f) ;; use only the public peers
+               (json-config
+               ;; choose one from
+               ;; https://github.com/yggdrasil-network/public-peers
+                '((peers . #("tcp://1.2.3.4:1337"))))
+               ;; /etc/yggdrasil-private.conf is the default value for config-file
+               ))
+@end lisp
+@example
+# sample content for /etc/yggdrasil-private.conf
+@{
+  # Your public encryption key. Your peers may ask you for this to put
+  # into their AllowedEncryptionPublicKeys configuration.
+  EncryptionPublicKey: 378dc5...
+
+  # Your private encryption key. DO NOT share this with anyone!
+  EncryptionPrivateKey: 0777...
+
+  # Your public signing key. You should not ordinarily need to share
+  # this with anyone.
+  SigningPublicKey: e1664...
+
+  # Your private signing key. DO NOT share this with anyone!
+  SigningPrivateKey: 0589d...
+@}
+@end example
+@end defvr
+
+@deftp {Data Type} yggdrasil-configuration
+Data type representing the configuration of Yggdrasil.
+
+@table @asis
+@item @code{package} (default: @code{yggdrasil})
+Package object of Yggdrasil.
+
+@item @code{json-config} (default: @code{'()})
+Contents of @file{/etc/yggdrasil.conf}. Will be merged with @file{/etc/yggdrasil-private.conf}.
+Note that these settings are stored in the Guix store, which is readable to all users. @strong{Do not store your private keys in it.}
+See the output of @code{yggdrasil -genconf} for a quick overview of valid keys and their default values.
+
+@item @code{autoconf?} (default: @code{#f})
+Whether to use automatic mode. Enabling it makes Yggdrasil use adynamic IP and peer with IPv6 neighbors.
+
+@item @code{log-level} (default: @code{'info})
+How much detail to include in logs. Use @code{'debug} for more detail.
+
+@item @code{log-to} (default: @code{'stdout})
+Where to send logs. By default, the service logs standard output to @file{/var/log/yggdrasil.log}.
+The alternative is @code{'syslog}, which sends output to the running syslog service.
+
+@item @code{config-file} (default: @code{"/etc/yggdrasil-private.conf"})
+What HJSON file to load sensitive data from. This is where private keys should be stored, which are necessary to specify if you don't want a randomized address after each restart.
+Use @code{#f} to disable.
+Options defined in this file take precedence over @code{json-config}.
+Use the output of @code{yggdrasil -genconf} as a starting point. To configure a static address, delete everything except these options:
+@itemize
+@item @code{EncryptionPublicKey}
+@item @code{EncryptionPrivateKey}
+@item @code{SigningPublicKey}
+@item @code{SigningPrivateKey}
+@end itemize
+@end table
+@end deftp
+
 @node Unattended Upgrades
 @subsection Unattended Upgrades
 
diff --git a/gnu/services/networking.scm b/gnu/services/networking.scm
index 64f54e787f..9ec0f6a9ca 100644
--- a/gnu/services/networking.scm
+++ b/gnu/services/networking.scm
@@ -61,7 +61,9 @@
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-9)
   #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-43)
   #:use-module (ice-9 match)
+  #:use-module (json)
   #:re-export (static-networking-service
                static-networking-service-type)
   #:export (%facebook-host-aliases
@@ -180,7 +182,17 @@
             pagekite-configuration-kitesecret
             pagekite-configuration-frontend
             pagekite-configuration-kites
-            pagekite-configuration-extra-file))
+            pagekite-configuration-extra-file
+
+            yggdrasil-service-type
+            yggdrasil-configuration
+            yggdrasil-configuration?
+            yggdrasil-configuration-autoconf?
+            yggdrasil-configuration-config-file
+            yggdrasil-configuration-log-level
+            yggdrasil-configuration-log-to
+            yggdrasil-configuration-json-config
+            yggdrasil-configuration-package))
 
 ;;; Commentary:
 ;;;
@@ -1750,4 +1762,107 @@ table inet filter {
     "Run @url{https://pagekite.net/,PageKite}, a tunneling solution to make
 local servers publicly accessible on the web, even behind NATs and firewalls.")))
 
+
+;;;
+;;; Yggdrasil
+;;;
+
+(define-record-type* <yggdrasil-configuration>
+  yggdrasil-configuration
+  make-yggdrasil-configuration
+  yggdrasil-configuration?
+  (package yggdrasil-configuration-package
+           (default yggdrasil))
+  (json-config yggdrasil-configuration-json-config
+               (default '()))
+  (config-file yggdrasil-config-file
+               (default "/etc/yggdrasil-private.conf"))
+  (autoconf? yggdrasil-configuration-autoconf?
+             (default #f))
+  (log-level yggdrasil-configuration-log-level
+             (default 'info))
+  (log-to yggdrasil-configuration-log-to
+          (default 'stdout)))
+
+(define (yggdrasil-configuration-file config)
+  (define (scm->yggdrasil-json x)
+    (define key-value?
+      dotted-list?)
+    (define (param->camel str)
+      (string-concatenate
+       (map
+	string-capitalize
+	(string-split str (cut eqv? <> #\-)))))
+    (cond
+     ((key-value? x)
+      (let ((k (car x))
+	    (v (cdr x)))
+	(cons
+	 (if (symbol? k)
+	     (param->camel (symbol->string k))
+	     k)
+	 v)))
+     ((list? x) (map scm->yggdrasil-json x))
+     ((vector? x) (vector-map scm->yggdrasil-json x))
+     (else x)))
+  (computed-file
+   "yggdrasil.conf"
+   #~(call-with-output-file #$output
+       (lambda (port)
+         ;; it's HJSON, so comments are a-okay
+         (display "# Generated by yggdrasil-service\n" port)
+         (display #$(scm->json-string
+                     (scm->yggdrasil-json
+                      (yggdrasil-configuration-json-config config)))
+                  port)))))
+
+(define (yggdrasil-shepherd-service config)
+  "Return a <shepherd-service> for yggdrasil with CONFIG."
+  (define yggdrasil-command
+    #~(append
+       (list (string-append
+              #$(yggdrasil-configuration-package config)
+              "/bin/yggdrasil")
+             "-useconffile"
+             #$(yggdrasil-configuration-file config))
+       (if #$(yggdrasil-configuration-autoconf? config)
+           '("-autoconf")
+           '())
+       (let ((extraconf #$(yggdrasil-config-file config)))
+         (if extraconf
+             (list "-extraconffile" extraconf)
+             '()))
+       (list "-loglevel"
+             #$(symbol->string
+		(yggdrasil-configuration-log-level config))
+             "-logto"
+             #$(symbol->string
+		(yggdrasil-configuration-log-to config)))))
+  (list (shepherd-service
+         (documentation "Connect to the Yggdrasil mesh network")
+         (provision '(yggdrasil))
+         (requirement '(networking))
+         (start #~(make-forkexec-constructor
+                   #$yggdrasil-command
+                   #:log-file "/var/log/yggdrasil.log"
+                   #:group "yggdrasil"))
+         (stop #~(make-kill-destructor)))))
+
+(define %yggdrasil-accounts
+  (list (user-group (name "yggdrasil") (system? #t))))
+
+(define yggdrasil-service-type
+  (service-type
+   (name 'yggdrasil)
+   (description
+    "Connect to the Yggdrasil mesh network.
+See yggdrasil -genconf for config options.")
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             yggdrasil-shepherd-service)
+          (service-extension account-service-type
+                             (const %yggdrasil-accounts))
+          (service-extension profile-service-type
+                             (compose list yggdrasil-configuration-package))))))
+
 ;;; networking.scm ends here
diff --git a/gnu/system/examples/yggdrasil.tmpl b/gnu/system/examples/yggdrasil.tmpl
new file mode 100644
index 0000000000..be80bf4de9
--- /dev/null
+++ b/gnu/system/examples/yggdrasil.tmpl
@@ -0,0 +1,60 @@
+;; This is an operating system configuration template
+;; for a "bare bones" setup, with no X11 display server.
+
+(use-modules (gnu))
+(use-service-modules networking ssh)
+(use-package-modules admin curl networking screen)
+
+(operating-system
+  (host-name "ruby-guard-5545")
+  (timezone "Europe/Budapest")
+  (locale "en_US.utf8")
+
+  ;; Boot in "legacy" BIOS mode, assuming /dev/sdX is the
+  ;; target hard disk, and "my-root" is the label of the target
+  ;; root file system.
+  (bootloader (bootloader-configuration
+                (bootloader grub-bootloader)
+                (target "/dev/sdX")))
+  (file-systems (cons (file-system
+                        (device (file-system-label "my-root"))
+                        (mount-point "/")
+                        (type "ext4"))
+                      %base-file-systems))
+  (users (cons (user-account
+                (name "alice")
+                (comment "Bob's sister")
+                (group "users")
+                ;; adding her to the yggdrasil group means she can use
+                ;; yggdrasilctl to modify the configuration
+                (supplementary-groups '("wheel" "yggdrasil")))
+               %base-user-accounts))
+
+  ;; Globally-installed packages.
+  (packages (cons* screen curl %base-packages))
+
+  ;; Add services to the baseline: a DHCP client and
+  ;; an SSH server.
+  ;; If you add an /etc/yggdrasil-private.conf, you can log in to ssh
+  ;; using your Yggdrasil IPv6 address from another machine running Yggdrasil.
+  ;; Alternatively, the client can sit behind a router that has Yggdrasil.
+  ;; That file is specifically _not_ handled by Guix, because we don't want its
+  ;; contents to sit in the world-readable /gnu/store.
+  (services
+   (append
+    (list
+     (service dhcp-client-service-type)
+     (service yggdrasil-service-type
+              (yggdrasil-configuration
+               (log-to 'stdout)
+               (log-level 'debug)
+               (autoconf? #f)
+               (json-config
+                ;; choose a few from
+                ;; https://github.com/yggdrasil-network/public-peers
+                '((peers . #("tcp://1.2.3.4:1337"))))
+               (config-file #f)))
+     (service openssh-service-type
+              (openssh-configuration
+               (port-number 2222))))
+    %base-services)))
-- 
2.28.0