[PATCH] gnu: Add kerberos service.

[John Darrington]

* gnu/services/kerberos.scm (krb5-realm, krb5-configuration,
krb5-service-type): New variables.
---
 gnu/services/kerberos.scm | 230 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 229 insertions(+), 1 deletion(-)

diff --git a/gnu/services/kerberos.scm b/gnu/services/kerberos.scm
index 144c71b..2147dd8 100644
--- a/gnu/services/kerberos.scm
+++ b/gnu/services/kerberos.scm
@@ -22,9 +22,237 @@
   #:use-module (gnu system pam)
   #:use-module (guix gexp)
   #:use-module (guix records)
+  #:use-module (srfi srfi-1)
   #:export (pam-krb5-configuration
             pam-krb5-configuration?
-            pam-krb5-service-type))
+            pam-krb5-service-type
+
+            krb5-realm
+            krb5-realm?
+
+            krb5-configuration
+            krb5-configuration?
+            krb5-service-type))
+
+(define-record-type* <krb5-realm>
+  krb5-realm      make-krb5-realm
+  krb5-realm?
+  (name                krb5-realm-name)
+
+  (admin-server        krb5-realm-admin-server)
+  (kdc                 krb5-realm-kdc)
+  (auth-to-local       krb5-realm-auth-to-local (default '()))
+  (auth-to-local-names krb5-realm-auth-to-local-names (default '()))
+  (http-anchors        krb5-realm-http-anchors (default '()))
+  (default-domain      krb5-realm-default-domain (default #f))
+  (kpasswd-server      krb5-realm-kpasswd-server (default #f))
+  (master-kdc          krb5-realm-master-kdc (default #f))
+  (v4-instance-convert krb5-realm-v4-instance-convert (default '()))
+  (v4-realm            krb5-realm-v4-realm (default #f)))
+
+
+(define-syntax  guile->krb-cfg
+  (syntax-rules ()
+    ((guile->krb-cfg accessor what)
+     (string-map
+      (lambda (c) (if (eq? c #\-) #\_ c))
+      (string-drop (symbol->string accessor)
+                   (string-length what))))))
+
+(define-syntax cfg-opt-string
+  (syntax-rules ()
+    ((cfg-opt-string accessor realm)
+     (if (accessor realm)
+         (format #f "\n\t~a = ~a"
+                        (guile->krb-cfg 'accessor "krb5-realm-")
+                        (accessor realm))
+         ""))))
+
+
+;; Generates one line of text per list item
+(define-syntax cfg-opt-list
+  (syntax-rules ()
+    ((cfg-opt-list accessor realm)
+     (if (not (null? (accessor realm)))
+         (string-concatenate
+          (map (lambda (item)
+                 (format #f "\n\t~a = ~a"
+                         (guile->krb-cfg 'accessor "krb5-realm-")
+                         item))
+              (accessor realm)))
+     ""))))
+
+(define (krb5-realm->string realm)
+  "Return a string suitable for a krb5.conf fragment representing REALM"
+  (string-append "\n" (krb5-realm-name realm) " = {"
+                 (cfg-opt-string krb5-realm-kdc realm)
+                 (cfg-opt-string krb5-realm-admin-server realm)
+                 (cfg-opt-string krb5-realm-default-domain realm)
+                 (cfg-opt-list krb5-realm-auth-to-local realm)
+                 (cfg-opt-list krb5-realm-http-anchors realm)
+                 (cfg-opt-string krb5-realm-kpasswd-server realm)
+                 (cfg-opt-string krb5-realm-master-kdc realm)
+                 (cfg-opt-string krb5-realm-v4-realm realm)
+                 "\n}"))
+
+
+;; For explanation of these fields see man 5 krb5.conf
+(define-record-type* <krb5-configuration>
+  krb5-configuration    make-krb5-configuration
+  krb5-configuration?
+
+  ;; [libdefaults]
+  (allow-weak-crypto          krb5-configuration-allow-weak-crypto (default 
#f))
+  (ap-req-checksum-type       krb5-configuration-ap-req-checksum-type (default 
#f))
+  (canonicalize               krb5-configuration-canonicalize (default #f))
+  (ccache-type                krb5-configuration-ccache-type (default #f))
+  (clockskew                  krb5-configuration-clockskew (default #f))
+  (default-ccache-name        krb5-configuration-default-ccache-name (default 
#f))
+  (default-client-keytab-name krb5-configuration-default-client-keytab-name
+                                                                     (default 
#f))
+  (default-keytab-name        krb5-configuration-default-keytab-name (default 
#f))
+  (default-realm              krb5-configuration-default-realm (default #f))
+  (default-tgs-enctypes       krb5-configuration-default-tgs-enctypes (default 
#f))
+  (default-tkt-enctypes       krb5-configuration-default-tkt-enctypes (default 
#f))
+  (dns-canonicalize-hostname  krb5-configuration-dns-canonicalize-hostname
+                              (default #t))
+  (dns-lookup-kdc             krb5-configuration-dns-lookup-kdc
+                              (default #f))
+  (err-fmt                    krb5-configuration-err-fmt (default #f))
+  (extra-addresses            krb5-configuration-extra-addresses
+                              (default #f))
+  (forwardable                krb5-configuration-forwardable (default #t))
+  (ignore-acceptor-hostname   krb5-configuration-ignore-acceptor-hostname
+                              (default #f))
+  (k5login-authoritative      krb5-configuration-k5login-authoritative 
(default #t))
+  (k5login-directory          krb5-configuration-k5login-directory (default 
#f))
+  (kcm-mach-service           krb5-configuration-kcm-mach-service
+                                (default "org.h5l.kcm"))
+  (kcm-socket                 krb5-configuration-kcm-socket
+                                (default "/var/run/.heim_org.h5l.kcm-socket"))
+  (kdc-default-options        krb5-configuration-kdc-default-options
+                                (default #f))
+  (kdc-timesync               krb5-configuration-kdc-timesync (default #t))
+  (kdc-req-checksum-type      krb5-configuration-kdc-req-checksum-type 
(default #f))
+  (noaddresses                krb5-configuration-noaddresses
+                               (default #f))
+  (permitted-enctypes         krb5-configuration-permitted-enctypes
+                              (default #f))
+  (plugin-base-dir            krb5-configuration-plugin-base-dir
+                                (default #f))
+  (preferred-preauth-types    krb5-configuration-preferred-preauth-types
+                              (default #f))
+  (proxiable                  krb5-configuration-proxiable (default #f))
+  (rdns                       krb5-configuration-rdns (default #t))
+  (realm-try-domains          krb5-configuration-realm-try-domains
+                               (default #f))
+  (renew-lifetime             krb5-configuration-renew-lifetime
+                              (default #f))
+  (safe-checksum-type         krb5-configuration-safe-checksum-type
+                              (default #f))
+  (ticket-lifetime            krb5-configuration-ticket-lifetime
+                              (default #f))
+  (udp-preference-limit       krb5-configuration-udp-preference-limit
+                              (default #f))
+  (verify-ap-req-nofail       krb5-configuration-verify-ap-req-nofail
+                              (default #f))
+
+  ;;[realms]
+  (realms                     krb5-configuration-realms)
+
+  ;;[domain_realm]
+  (domain-realm-map           krb5-configuration-domain-realm-map (default 
'())))
+
+
+(define-syntax cfg-string
+  (syntax-rules ()
+    ((cfg-string accessor config)
+     (if (accessor config)
+         (format #f "\n\t~a = ~a"
+                 (guile->krb-cfg 'accessor "krb5-configuration-")
+                 (accessor config))
+         ""))))
+
+(define-syntax cfg-boolean
+  (syntax-rules ()
+    ((cfg-string accessor config)
+     (format #f "\n\t~a = ~a"
+                    (guile->krb-cfg 'accessor "krb5-configuration-")
+                    (if (accessor config) "true" "false")))))
+
+;; Generates a comma separated list
+(define-syntax cfg-list
+  (syntax-rules ()
+    ((cfg-string accessor config)
+     (if (accessor config)
+         (format #f "\n\t~a = ~a"
+                 (guile->krb-cfg 'accessor "krb5-configuration-")
+                 (fold (lambda (i prev)
+                         (string-append prev
+                                        (if (zero? (string-length prev))
+                                            ""  ", ") i)) ""
+                                            (accessor config))) ""))))
+
+(define (krb5-configuration-file config)
+  "Create a Kerberos 5 configuration file based on CONFIG"
+  (mixed-text-file "krb5.conf"
+
+"[libdefaults]"
+(cfg-string  krb5-configuration-default-realm config)
+(cfg-boolean krb5-configuration-allow-weak-crypto config)
+(cfg-string  krb5-configuration-ap-req-checksum-type config)
+(cfg-boolean krb5-configuration-canonicalize config)
+(cfg-string  krb5-configuration-ccache-type config)
+(cfg-string  krb5-configuration-clockskew config)
+(cfg-string  krb5-configuration-default-ccache-name config)
+(cfg-string  krb5-configuration-default-client-keytab-name config)
+(cfg-string  krb5-configuration-default-keytab-name config)
+(cfg-string  krb5-configuration-default-tgs-enctypes config)
+(cfg-string  krb5-configuration-default-tkt-enctypes config)
+(cfg-boolean krb5-configuration-dns-canonicalize-hostname config)
+(cfg-boolean krb5-configuration-dns-lookup-kdc config)
+(cfg-string  krb5-configuration-err-fmt config)
+(cfg-list    krb5-configuration-extra-addresses config)
+(cfg-boolean krb5-configuration-ignore-acceptor-hostname config)
+(cfg-boolean krb5-configuration-k5login-authoritative config)
+(cfg-string  krb5-configuration-k5login-directory config)
+(cfg-boolean krb5-configuration-forwardable config)
+(cfg-string  krb5-configuration-kcm-mach-service config)
+(cfg-string  krb5-configuration-kcm-socket config)
+(cfg-string  krb5-configuration-kdc-default-options config)
+(cfg-boolean krb5-configuration-kdc-timesync config)
+(cfg-boolean krb5-configuration-proxiable config)
+(cfg-string  krb5-configuration-kdc-req-checksum-type config)
+(cfg-boolean krb5-configuration-noaddresses config)
+(cfg-list    krb5-configuration-permitted-enctypes config)
+(cfg-string  krb5-configuration-plugin-base-dir config)
+(cfg-list    krb5-configuration-preferred-preauth-types config)
+(cfg-boolean krb5-configuration-rdns config)
+(cfg-string  krb5-configuration-realm-try-domains config)
+(cfg-string  krb5-configuration-renew-lifetime config)
+(cfg-string  krb5-configuration-safe-checksum-type config)
+(cfg-string  krb5-configuration-ticket-lifetime config)
+(cfg-string  krb5-configuration-udp-preference-limit config)
+(cfg-boolean krb5-configuration-verify-ap-req-nofail config)
+
+"\n\n[realms]"
+(string-concatenate (map krb5-realm->string (krb5-configuration-realms 
config)))
+
+"\n"))
+
+
+(define (krb5-etc-service config)
+  (list `("krb5.conf" ,(krb5-configuration-file config))))
+
+
+(define krb5-service-type
+  (service-type (name 'krb5)
+                (extensions
+                 (list (service-extension etc-service-type
+                                          krb5-etc-service)))))
+
+
+
 
 (define-record-type* <pam-krb5-configuration>
   pam-krb5-configuration  make-pam-krb5-configuration
-- 
2.1.4