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Diffstat (limited to 'gnu/services/cups.scm')
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diff --git a/gnu/services/cups.scm b/gnu/services/cups.scm new file mode 100644 index 0000000000..7542ee26c0 --- /dev/null +++ b/gnu/services/cups.scm @@ -0,0 +1,1166 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2016 Andy Wingo <wingo@pobox.com> +;;; +;;; This file is part of GNU Guix. +;;; +;;; GNU Guix is free software; you can redistribute it and/or modify it +;;; under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 3 of the License, or (at +;;; your option) any later version. +;;; +;;; GNU Guix is distributed in the hope that it will be useful, but +;;; WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;;; GNU General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. + +(define-module (gnu services cups) + #:use-module (gnu services) + #:use-module (gnu services shepherd) + #:use-module (gnu system shadow) + #:use-module (gnu packages admin) + #:use-module (gnu packages cups) + #:use-module (gnu packages tls) + #:use-module (guix packages) + #:use-module (guix records) + #:use-module (guix gexp) + #:use-module (texinfo) + #:use-module (texinfo serialize) + #:use-module (ice-9 match) + #:use-module ((srfi srfi-1) #:select (append-map)) + #:use-module (srfi srfi-34) + #:use-module (srfi srfi-35) + #:export (&cups-configuation-error + cups-configuration-error? + + cups-service-type + cups-configuration + opaque-cups-configuration + + files-configuration + policy-configuration + location-access-control + operation-access-control + method-access-control)) + +;;; Commentary: +;;; +;;; Service defininition for the CUPS printing system. +;;; +;;; Code: + +(define-condition-type &cups-configuration-error &error + cups-configuration-error?) + +(define (cups-error message) + (raise (condition (&message (message message)) + (&cups-configuration-error)))) +(define (cups-configuration-field-error field val) + (cups-error + (format #f "Invalid value for field ~a: ~s" field val))) +(define (cups-configuration-missing-field kind field) + (cups-error + (format #f "~a configuration missing required field ~a" kind field))) + +(define-record-type* <configuration-field> + configuration-field make-configuration-field configuration-field? + (name configuration-field-name) + (type configuration-field-type) + (getter configuration-field-getter) + (predicate configuration-field-predicate) + (serializer configuration-field-serializer) + (default-value-thunk configuration-field-default-value-thunk) + (documentation configuration-field-documentation)) + +(define (serialize-configuration config fields) + (for-each (lambda (field) + ((configuration-field-serializer field) + (configuration-field-name field) + ((configuration-field-getter field) config))) + fields)) + +(define (validate-configuration config fields) + (for-each (lambda (field) + (let ((val ((configuration-field-getter field) config))) + (unless ((configuration-field-predicate field) val) + (cups-configuration-field-error + (configuration-field-name field) val)))) + fields)) + +(define-syntax define-configuration + (lambda (stx) + (define (id ctx part . parts) + (let ((part (syntax->datum part))) + (datum->syntax + ctx + (match parts + (() part) + (parts (symbol-append part + (syntax->datum (apply id ctx parts)))))))) + (syntax-case stx () + ((_ stem (field (field-type def) doc) ...) + (with-syntax (((field-getter ...) + (map (lambda (field) + (id #'stem #'stem #'- field)) + #'(field ...))) + ((field-predicate ...) + (map (lambda (type) + (id #'stem type #'?)) + #'(field-type ...))) + ((field-serializer ...) + (map (lambda (type) + (id #'stem #'serialize- type)) + #'(field-type ...)))) + #`(begin + (define-record-type* #,(id #'stem #'< #'stem #'>) + #,(id #'stem #'% #'stem) + #,(id #'stem #'make- #'stem) + #,(id #'stem #'stem #'?) + (field field-getter (default def)) + ...) + (define #,(id #'stem #'stem #'-fields) + (list (configuration-field + (name 'field) + (type 'field-type) + (getter field-getter) + (predicate field-predicate) + (serializer field-serializer) + (default-value-thunk (lambda () def)) + (documentation doc)) + ...)) + (define-syntax-rule (stem arg (... ...)) + (let ((conf (#,(id #'stem #'% #'stem) arg (... ...)))) + (validate-configuration conf + #,(id #'stem #'stem #'-fields)) + conf)))))))) + +(define %cups-accounts + (list (user-group (name "lp") (system? #t)) + (user-group (name "lpadmin") (system? #t)) + (user-account + (name "lp") + (group "lp") + (system? #t) + (comment "System user for invoking printing helper programs") + (home-directory "/var/empty") + (shell (file-append shadow "/sbin/nologin"))))) + +(define (uglify-field-name field-name) + (let ((str (symbol->string field-name))) + (string-concatenate + (map string-titlecase + (string-split (if (string-suffix? "?" str) + (substring str 0 (1- (string-length str))) + str) + #\-))))) + +(define (serialize-field field-name val) + (format #t "~a ~a\n" (uglify-field-name field-name) val)) + +(define (serialize-package field-name val) + #f) + +(define (serialize-string field-name val) + (serialize-field field-name val)) + +(define (multiline-string-list? val) + (and (list? val) + (and-map (lambda (x) + (and (string? x) (not (string-index x #\space)))) + val))) +(define (serialize-multiline-string-list field-name val) + (for-each (lambda (str) (serialize-field field-name str)) val)) + +(define (space-separated-string-list? val) + (and (list? val) + (and-map (lambda (x) + (and (string? x) (not (string-index x #\space)))) + val))) +(define (serialize-space-separated-string-list field-name val) + (serialize-field field-name (string-join val " "))) + +(define (space-separated-symbol-list? val) + (and (list? val) (and-map symbol? val))) +(define (serialize-space-separated-symbol-list field-name val) + (serialize-field field-name (string-join (map symbol->string val) " "))) + +(define (file-name? val) + (and (string? val) + (string-prefix? "/" val))) +(define (serialize-file-name field-name val) + (serialize-string field-name val)) + +(define (serialize-boolean field-name val) + (serialize-string field-name (if val "yes" "no"))) + +(define (non-negative-integer? val) + (and (exact-integer? val) (not (negative? val)))) +(define (serialize-non-negative-integer field-name val) + (serialize-field field-name val)) + +(define-syntax define-enumerated-field-type + (lambda (x) + (define (id-append ctx . parts) + (datum->syntax ctx (apply symbol-append (map syntax->datum parts)))) + (syntax-case x () + ((_ name (option ...)) + #`(begin + (define (#,(id-append #'name #'name #'?) x) + (memq x '(option ...))) + (define (#,(id-append #'name #'serialize- #'name) field-name val) + (serialize-field field-name val))))))) + +(define-enumerated-field-type access-log-level + (config actions all)) +(define-enumerated-field-type browse-local-protocols + (all dnssd none)) +(define-enumerated-field-type default-auth-type + (Basic Negotiate)) +(define-enumerated-field-type default-encryption + (Never IfRequested Required)) +(define-enumerated-field-type error-policy + (abort-job retry-job retry-this-job stop-printer)) +(define-enumerated-field-type log-level + (none emerg alert crit error warn notice info debug debug2)) +(define-enumerated-field-type log-time-format + (standard usecs)) +(define-enumerated-field-type server-tokens + (None ProductOnly Major Minor Minimal OS Full)) +(define-enumerated-field-type method + (DELETE GET HEAD OPTIONS POST PUT TRACE)) +(define-enumerated-field-type sandboxing + (relaxed strict)) + +(define (method-list? val) + (and (list? val) (and-map method? val))) +(define (serialize-method-list field-name val) + (serialize-field field-name (string-join (map symbol->string val) " "))) + +(define (host-name-lookups? val) + (memq val '(#f #t 'double))) +(define (serialize-host-name-lookups field-name val) + (serialize-field field-name + (match val (#f "No") (#t "Yes") ('double "Double")))) + +(define (host-name-list-or-*? x) + (or (eq? x '*) + (and (list? x) (and-map string? x)))) +(define (serialize-host-name-list-or-* field-name val) + (serialize-field field-name (match val + ('* '*) + (names (string-join names " "))))) + +(define (boolean-or-non-negative-integer? x) + (or (boolean? x) (non-negative-integer? x))) +(define (serialize-boolean-or-non-negative-integer field-name x) + (if (boolean? x) + (serialize-boolean field-name x) + (serialize-non-negative-integer field-name x))) + +(define (ssl-options? x) + (and (list? x) + (and-map (lambda (elt) (memq elt '(AllowRC4 AllowSSL3))) x))) +(define (serialize-ssl-options field-name val) + (serialize-field field-name + (match val + (() "None") + (opts (string-join (map symbol->string opts) " "))))) + +(define (serialize-access-control x) + (display x) + (newline)) +(define (serialize-access-control-list field-name val) + (for-each serialize-access-control val)) +(define (access-control-list? val) + (and (list? val) (and-map string? val))) + +(define-configuration operation-access-control + (operations + (space-separated-symbol-list '()) + "IPP operations to which this access control applies.") + (access-controls + (access-control-list '()) + "Access control directives, as a list of strings. Each string should be one directive, such as \"Order allow,deny\".")) + +(define-configuration method-access-control + (reverse? + (boolean #f) + "If @code{#t}, apply access controls to all methods except the listed +methods. Otherwise apply to only the listed methods.") + (methods + (method-list '()) + "Methods to which this access control applies.") + (access-controls + (access-control-list '()) + "Access control directives, as a list of strings. Each string should be one directive, such as \"Order allow,deny\".")) + +(define (serialize-operation-access-control x) + (format #t "<Limit ~a>\n" + (string-join (map symbol->string + (operation-access-control-operations x)) " ")) + (serialize-configuration + x + (filter (lambda (field) + (not (eq? (configuration-field-name field) 'operations))) + operation-access-control-fields)) + (format #t "</Limit>\n")) + +(define (serialize-method-access-control x) + (let ((limit (if (method-access-control-reverse? x) "LimitExcept" "Limit"))) + (format #t "<~a ~a>\n" limit + (string-join (map symbol->string + (method-access-control-methods x)) " ")) + (serialize-configuration + x + (filter (lambda (field) + (case (configuration-field-name field) + ((reverse? methods) #f) + (else #t))) + method-access-control-fields)) + (format #t "</~a>\n" limit))) + +(define (operation-access-control-list? val) + (and (list? val) (and-map operation-access-control? val))) +(define (serialize-operation-access-control-list field-name val) + (for-each serialize-operation-access-control val)) + +(define (method-access-control-list? val) + (and (list? val) (and-map method-access-control? val))) +(define (serialize-method-access-control-list field-name val) + (for-each serialize-method-access-control val)) + +(define-configuration location-access-control + (path + (file-name (cups-configuration-missing-field 'location-access-control 'path)) + "Specifies the URI path to which the access control applies.") + (access-controls + (access-control-list '()) + "Access controls for all access to this path, in the same format as the +@code{access-controls} of @code{operation-access-control}.") + (method-access-controls + (method-access-control-list '()) + "Access controls for method-specific access to this path.")) + +(define (serialize-location-access-control x) + (format #t "<Location ~a>\n" (location-access-control-path x)) + (serialize-configuration + x + (filter (lambda (field) + (not (eq? (configuration-field-name field) 'path))) + location-access-control-fields)) + (format #t "</Location>\n")) + +(define (location-access-control-list? val) + (and (list? val) (and-map location-access-control? val))) +(define (serialize-location-access-control-list field-name val) + (for-each serialize-location-access-control val)) + +(define-configuration policy-configuration + (name + (string (cups-configuration-missing-field 'policy-configuration 'name)) + "Name of the policy.") + (job-private-access + (string "@OWNER @SYSTEM") + "Specifies an access list for a job's private values. @code{@@ACL} maps to +the printer's requesting-user-name-allowed or requesting-user-name-denied +values. @code{@@OWNER} maps to the job's owner. @code{@@SYSTEM} maps to the +groups listed for the @code{system-group} field of the @code{files-config} +configuration, which is reified into the @code{cups-files.conf(5)} file. +Other possible elements of the access list include specific user names, and +@code{@@@var{group}} to indicate members of a specific group. The access list +may also be simply @code{all} or @code{default}.") + (job-private-values + (string (string-join '("job-name" "job-originating-host-name" + "job-originating-user-name" "phone"))) + "Specifies the list of job values to make private, or @code{all}, +@code{default}, or @code{none}.") + + (subscription-private-access + (string "@OWNER @SYSTEM") + "Specifies an access list for a subscription's private values. +@code{@@ACL} maps to the printer's requesting-user-name-allowed or +requesting-user-name-denied values. @code{@@OWNER} maps to the job's owner. +@code{@@SYSTEM} maps to the groups listed for the @code{system-group} field of +the @code{files-config} configuration, which is reified into the +@code{cups-files.conf(5)} file. Other possible elements of the access list +include specific user names, and @code{@@@var{group}} to indicate members of a +specific group. The access list may also be simply @code{all} or +@code{default}.") + (subscription-private-values + (string (string-join '("notify-events" "notify-pull-method" + "notify-recipient-uri" "notify-subscriber-user-name" + "notify-user-data") + " ")) + "Specifies the list of job values to make private, or @code{all}, +@code{default}, or @code{none}.") + + (access-controls + (operation-access-control-list '()) + "Access control by IPP operation.")) + +(define (serialize-policy-configuration x) + (format #t "<Policy ~a>\n" (policy-configuration-name x)) + (serialize-configuration + x + (filter (lambda (field) + (not (eq? (configuration-field-name field) 'name))) + policy-configuration-fields)) + (format #t "</Policy>\n")) + +(define (policy-configuration-list? x) + (and (list? x) (and-map policy-configuration? x))) +(define (serialize-policy-configuration-list field-name x) + (for-each serialize-policy-configuration x)) + +(define (log-location? x) + (or (file-name? x) + (eq? x 'stderr) + (eq? x 'syslog))) +(define (serialize-log-location field-name x) + (if (string? x) + (serialize-file-name field-name x) + (serialize-field field-name x))) + +(define-configuration files-configuration + (access-log + (log-location "/var/log/cups/access_log") + "Defines the access log filename. Specifying a blank filename disables +access log generation. The value @code{stderr} causes log entries to be sent +to the standard error file when the scheduler is running in the foreground, or +to the system log daemon when run in the background. The value @code{syslog} +causes log entries to be sent to the system log daemon. The server name may +be included in filenames using the string @code{%s}, as in +@code{/var/log/cups/%s-access_log}.") + (cache-dir + (file-name "/var/cache/cups") + "Where CUPS should cache data.") + (config-file-perm + (string "0640") + "Specifies the permissions for all configuration files that the scheduler +writes. + +Note that the permissions for the printers.conf file are currently masked to +only allow access from the scheduler user (typically root). This is done +because printer device URIs sometimes contain sensitive authentication +information that should not be generally known on the system. There is no way +to disable this security feature.") + ;; Not specifying data-dir and server-bin options as we handle these + ;; manually. For document-root, the CUPS package has that path + ;; preconfigured. + (error-log + (log-location "/var/log/cups/error_log") + "Defines the error log filename. Specifying a blank filename disables +access log generation. The value @code{stderr} causes log entries to be sent +to the standard error file when the scheduler is running in the foreground, or +to the system log daemon when run in the background. The value @code{syslog} +causes log entries to be sent to the system log daemon. The server name may +be included in filenames using the string @code{%s}, as in +@code{/var/log/cups/%s-error_log}.") + (fatal-errors + (string "all -browse") + "Specifies which errors are fatal, causing the scheduler to exit. The kind +strings are: +@table @code +@item none +No errors are fatal. +@item all +All of the errors below are fatal. +@item browse +Browsing initialization errors are fatal, for example failed connections to +the DNS-SD daemon. +@item config +Configuration file syntax errors are fatal. +@item listen +Listen or Port errors are fatal, except for IPv6 failures on the loopback or +@code{any} addresses. +@item log +Log file creation or write errors are fatal. +@item permissions +Bad startup file permissions are fatal, for example shared TLS certificate and +key files with world-read permissions. +@end table") + (file-device? + (boolean #f) + "Specifies whether the file pseudo-device can be used for new printer +queues. The URI @url{file:///dev/null} is always allowed.") + (group + (string "lp") + "Specifies the group name or ID that will be used when executing external +programs.") + (log-file-perm + (string "0644") + "Specifies the permissions for all log files that the scheduler writes.") + (page-log + (log-location "/var/log/cups/page_log") + "Defines the page log filename. Specifying a blank filename disables +access log generation. The value @code{stderr} causes log entries to be sent +to the standard error file when the scheduler is running in the foreground, or +to the system log daemon when run in the background. The value @code{syslog} +causes log entries to be sent to the system log daemon. The server name may +be included in filenames using the string @code{%s}, as in +@code{/var/log/cups/%s-page_log}.") + (remote-root + (string "remroot") + "Specifies the username that is associated with unauthenticated accesses by +clients claiming to be the root user. The default is @code{remroot}.") + (request-root + (file-name "/var/spool/cups") + "Specifies the directory that contains print jobs and other HTTP request +data.") + (sandboxing + (sandboxing 'strict) + "Specifies the level of security sandboxing that is applied to print +filters, backends, and other child processes of the scheduler; either +@code{relaxed} or @code{strict}. This directive is currently only +used/supported on macOS.") + (server-keychain + (file-name "/etc/cups/ssl") + "Specifies the location of TLS certificates and private keys. CUPS will +look for public and private keys in this directory: a @code{.crt} files for +PEM-encoded certificates and corresponding @code{.key} files for PEM-encoded +private keys.") + (server-root + (file-name "/etc/cups") + "Specifies the directory containing the server configuration files.") + (sync-on-close? + (boolean #f) + "Specifies whether the scheduler calls fsync(2) after writing configuration +or state files.") + (system-group + (space-separated-string-list '("lpadmin" "wheel" "root")) + "Specifies the group(s) to use for @code{@@SYSTEM} group authentication.") + (temp-dir + (file-name "/var/spool/cups/tmp") + "Specifies the directory where temporary files are stored.") + (user + (string "lp") + "Specifies the user name or ID that is used when running external +programs.")) + +(define (serialize-files-configuration field-name val) + #f) + +(define (environment-variables? vars) + (space-separated-string-list? vars)) +(define (serialize-environment-variables field-name vars) + (unless (null? vars) + (serialize-space-separated-string-list field-name vars))) + +(define (package-list? val) + (and (list? val) (and-map package? val))) +(define (serialize-package-list field-name val) + #f) + +(define-configuration cups-configuration + (cups + (package cups) + "The CUPS package.") + (extensions + (package-list (list cups-filters)) + "Drivers and other extensions to the CUPS package.") + (files-configuration + (files-configuration (files-configuration)) + "Configuration of where to write logs, what directories to use for print +spools, and related privileged configuration parameters.") + (access-log-level + (access-log-level 'actions) + "Specifies the logging level for the AccessLog file. The @code{config} +level logs when printers and classes are added, deleted, or modified and when +configuration files are accessed or updated. The @code{actions} level logs +when print jobs are submitted, held, released, modified, or canceled, and any +of the conditions for @code{config}. The @code{all} level logs all +requests.") + (auto-purge-jobs? + (boolean #f) + "Specifies whether to purge job history data automatically when it is no +longer required for quotas.") + (browse-local-protocols + (browse-local-protocols 'dnssd) + "Specifies which protocols to use for local printer sharing.") + (browse-web-if? + (boolean #f) + "Specifies whether the CUPS web interface is advertised.") + (browsing? + (boolean #f) + "Specifies whether shared printers are advertised.") + (classification + (string "") + "Specifies the security classification of the server. +Any valid banner name can be used, including \"classified\", \"confidential\", +\"secret\", \"topsecret\", and \"unclassified\", or the banner can be omitted +to disable secure printing functions.") + (classify-override? + (boolean #f) + "Specifies whether users may override the classification (cover page) of +individual print jobs using the @code{job-sheets} option.") + (default-auth-type + (default-auth-type 'Basic) + "Specifies the default type of authentication to use.") + (default-encryption + (default-encryption 'Required) + "Specifies whether encryption will be used for authenticated requests.") + (default-language + (string "en") + "Specifies the default language to use for text and web content.") + (default-paper-size + (string "Auto") + "Specifies the default paper size for new print queues. @samp{\"Auto\"} +uses a locale-specific default, while @samp{\"None\"} specifies there is no +default paper size. Specific size names are typically @samp{\"Letter\"} or +@samp{\"A4\"}.") + (default-policy + (string "default") + "Specifies the default access policy to use.") + (default-shared? + (boolean #t) + "Specifies whether local printers are shared by default.") + (dirty-clean-interval + (non-negative-integer 30) + "Specifies the delay for updating of configuration and state files, in +seconds. A value of 0 causes the update to happen as soon as possible, +typically within a few milliseconds.") + (error-policy + (error-policy 'stop-printer) + "Specifies what to do when an error occurs. Possible values are +@code{abort-job}, which will discard the failed print job; @code{retry-job}, +which will retry the job at a later time; @code{retry-this-job}, which retries +the failed job immediately; and @code{stop-printer}, which stops the +printer.") + (filter-limit + (non-negative-integer 0) + "Specifies the maximum cost of filters that are run concurrently, which can +be used to minimize disk, memory, and CPU resource problems. A limit of 0 +disables filter limiting. An average print to a non-PostScript printer needs +a filter limit of about 200. A PostScript printer needs about half +that (100). Setting the limit below these thresholds will effectively limit +the scheduler to printing a single job at any time.") + (filter-nice + (non-negative-integer 0) + "Specifies the scheduling priority of filters that are run to print a job. +The nice value ranges from 0, the highest priority, to 19, the lowest +priority.") + ;; Add this option if the package is built with Kerberos support. + ;; (gss-service-name + ;; (string "http") + ;; "Specifies the service name when using Kerberos authentication.") + (host-name-lookups + (host-name-lookups #f) + "Specifies whether to do reverse lookups on connecting clients. +The @code{double} setting causes @code{cupsd} to verify that the hostname +resolved from the address matches one of the addresses returned for that +hostname. Double lookups also prevent clients with unregistered addresses +from connecting to your server. Only set this option to @code{#t} or +@code{double} if absolutely required.") + ;; Add this option if the package is built with launchd/systemd support. + ;; (idle-exit-timeout + ;; (non-negative-integer 60) + ;; "Specifies the length of time to wait before shutting down due to + ;; inactivity. Note: Only applicable when @code{cupsd} is run on-demand + ;; (e.g., with @code{-l}).") + (job-kill-delay + (non-negative-integer 30) + "Specifies the number of seconds to wait before killing the filters and +backend associated with a canceled or held job.") + (job-retry-interval + (non-negative-integer 30) + "Specifies the interval between retries of jobs in seconds. This is +typically used for fax queues but can also be used with normal print queues +whose error policy is @code{retry-job} or @code{retry-current-job}.") + (job-retry-limit + (non-negative-integer 5) + "Specifies the number of retries that are done for jobs. This is typically +used for fax queues but can also be used with normal print queues whose error +policy is @code{retry-job} or @code{retry-current-job}.") + (keep-alive? + (boolean #t) + "Specifies whether to support HTTP keep-alive connections.") + (keep-alive-timeout + (non-negative-integer 30) + "Specifies how long an idle client connection remains open, in seconds.") + (limit-request-body + (non-negative-integer 0) + "Specifies the maximum size of print files, IPP requests, and HTML form +data. A limit of 0 disables the limit check.") + (listen + (multiline-string-list '("localhost:631" "/var/run/cups/cups.sock")) + "Listens on the specified interfaces for connections. Valid values are of +the form @var{address}:@var{port}, where @var{address} is either an IPv6 +address enclosed in brackets, an IPv4 address, or @code{*} to indicate all +addresses. Values can also be file names of local UNIX domain sockets. The +Listen directive is similar to the Port directive but allows you to restrict +access to specific interfaces or networks.") + (listen-back-log + (non-negative-integer 128) + "Specifies the number of pending connections that will be allowed. This +normally only affects very busy servers that have reached the MaxClients +limit, but can also be triggered by large numbers of simultaneous connections. +When the limit is reached, the operating system will refuse additional +connections until the scheduler can accept the pending ones.") + (location-access-controls + (location-access-control-list + (list (location-access-control + (path "/") + (access-controls '("Order allow,deny" + "Allow localhost"))) + (location-access-control + (path "/admin") + (access-controls '("Order allow,deny" + "Allow localhost"))) + (location-access-control + (path "/admin/conf") + (access-controls '("Order allow,deny" + "AuthType Basic" + "Require user @SYSTEM" + "Allow localhost"))))) + "Specifies a set of additional access controls.") + (log-debug-history + (non-negative-integer 100) + "Specifies the number of debugging messages that are retained for logging +if an error occurs in a print job. Debug messages are logged regardless of +the LogLevel setting.") + (log-level + (log-level 'info) + "Specifies the level of logging for the ErrorLog file. The value +@code{none} stops all logging while @code{debug2} logs everything.") + (log-time-format + (log-time-format 'standard) + "Specifies the format of the date and time in the log files. The value +@code{standard} logs whole seconds while @code{usecs} logs microseconds.") + (max-clients + (non-negative-integer 100) + "Specifies the maximum number of simultaneous clients that are allowed by +the scheduler.") + (max-clients-per-host + (non-negative-integer 100) + "Specifies the maximum number of simultaneous clients that are allowed from +a single address.") + (max-copies + (non-negative-integer 9999) + "Specifies the maximum number of copies that a user can print of each +job.") + (max-hold-time + (non-negative-integer 0) + "Specifies the maximum time a job may remain in the @code{indefinite} hold +state before it is canceled. A value of 0 disables cancellation of held +jobs.") + (max-jobs + (non-negative-integer 500) + "Specifies the maximum number of simultaneous jobs that are allowed. Set +to 0 to allow an unlimited number of jobs.") + (max-jobs-per-printer + (non-negative-integer 0) + "Specifies the maximum number of simultaneous jobs that are allowed per +printer. A value of 0 allows up to MaxJobs jobs per printer.") + (max-jobs-per-user + (non-negative-integer 0) + "Specifies the maximum number of simultaneous jobs that are allowed per +user. A value of 0 allows up to MaxJobs jobs per user.") + (max-job-time + (non-negative-integer 10800) + "Specifies the maximum time a job may take to print before it is canceled, +in seconds. Set to 0 to disable cancellation of \"stuck\" jobs.") + (max-log-size + (non-negative-integer 1048576) + "Specifies the maximum size of the log files before they are rotated, in +bytes. The value 0 disables log rotation.") + (multiple-operation-timeout + (non-negative-integer 300) + "Specifies the maximum amount of time to allow between files in a multiple +file print job, in seconds.") + (page-log-format + (string "") + "Specifies the format of PageLog lines. Sequences beginning with +percent (@samp{%}) characters are replaced with the corresponding information, +while all other characters are copied literally. The following percent +sequences are recognized: + +@table @samp +@item %% +insert a single percent character +@item %@{name@} +insert the value of the specified IPP attribute +@item %C +insert the number of copies for the current page +@item %P +insert the current page number +@item %T +insert the current date and time in common log format +@item %j +insert the job ID +@item %p +insert the printer name +@item %u +insert the username +@end table + +A value of the empty string disables page logging. The string @code{%p %u %j +%T %P %C %@{job-billing@} %@{job-originating-host-name@} %@{job-name@} +%@{media@} %@{sides@}} creates a page log with the standard items.") + (environment-variables + (environment-variables '()) + "Passes the specified environment variable(s) to child processes; a list of +strings.") + (policies + (policy-configuration-list + (list (policy-configuration + (name "default") + (access-controls + (list + (operation-access-control + (operations + '(Send-Document + Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs + Cancel-Job Close-Job Cancel-My-Jobs Set-Job-Attributes + Create-Job-Subscription Renew-Subscription + Cancel-Subscription Get-Notifications + Reprocess-Job Cancel-Current-Job Suspend-Current-Job + Resume-Job CUPS-Move-Job Validate-Job + CUPS-Get-Document)) + (access-controls '("Require user @OWNER @SYSTEM" + "Order deny,allow"))) + (operation-access-control + (operations + '(Pause-Printer + Cancel-Jobs + Resume-Printer Set-Printer-Attributes Enable-Printer + Disable-Printer Pause-Printer-After-Current-Job + Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer + Activate-Printer Restart-Printer Shutdown-Printer + Startup-Printer Promote-Job Schedule-Job-After + CUPS-Authenticate-Job CUPS-Add-Printer + CUPS-Delete-Printer CUPS-Add-Class CUPS-Delete-Class + CUPS-Accept-Jobs CUPS-Reject-Jobs CUPS-Set-Default)) + (access-controls '("AuthType Basic" + "Require user @SYSTEM" + "Order deny,allow"))) + (operation-access-control + (operations '(All)) + (access-controls '("Order deny,allow")))))))) + "Specifies named access control policies.") + #; + (port + (non-negative-integer 631) + "Listens to the specified port number for connections.") + (preserve-job-files + (boolean-or-non-negative-integer 86400) + "Specifies whether job files (documents) are preserved after a job is +printed. If a numeric value is specified, job files are preserved for the +indicated number of seconds after printing. Otherwise a boolean value applies +indefinitely.") + (preserve-job-history + (boolean-or-non-negative-integer #t) + "Specifies whether the job history is preserved after a job is printed. +If a numeric value is specified, the job history is preserved for the +indicated number of seconds after printing. If @code{#t}, the job history is +preserved until the MaxJobs limit is reached.") + (reload-timeout + (non-negative-integer 30) + "Specifies the amount of time to wait for job completion before restarting +the scheduler.") + (rip-cache + (string "128m") + "Specifies the maximum amount of memory to use when converting documents into bitmaps for a printer.") + (server-admin + (string "root@localhost.localdomain") + "Specifies the email address of the server administrator.") + (server-alias + (host-name-list-or-* '*) + "The ServerAlias directive is used for HTTP Host header validation when +clients connect to the scheduler from external interfaces. Using the special +name @code{*} can expose your system to known browser-based DNS rebinding +attacks, even when accessing sites through a firewall. If the auto-discovery +of alternate names does not work, we recommend listing each alternate name +with a ServerAlias directive instead of using @code{*}.") + (server-name + (string "localhost") + "Specifies the fully-qualified host name of the server.") + (server-tokens + (server-tokens 'Minimal) + "Specifies what information is included in the Server header of HTTP +responses. @code{None} disables the Server header. @code{ProductOnly} +reports @code{CUPS}. @code{Major} reports @code{CUPS 2}. @code{Minor} +reports @code{CUPS 2.0}. @code{Minimal} reports @code{CUPS 2.0.0}. @code{OS} +reports @code{CUPS 2.0.0 (@var{uname})} where @var{uname} is the output of the +@code{uname} command. @code{Full} reports @code{CUPS 2.0.0 (@var{uname}) +IPP/2.0}.") + (set-env + (string "variable value") + "Set the specified environment variable to be passed to child processes.") + (ssl-listen + (multiline-string-list '()) + "Listens on the specified interfaces for encrypted connections. Valid +values are of the form @var{address}:@var{port}, where @var{address} is either +an IPv6 address enclosed in brackets, an IPv4 address, or @code{*} to indicate +all addresses.") + (ssl-options + (ssl-options '()) + "Sets encryption options. +By default, CUPS only supports encryption using TLS v1.0 or higher using known +secure cipher suites. The @code{AllowRC4} option enables the 128-bit RC4 +cipher suites, which are required for some older clients that do not implement +newer ones. The @code{AllowSSL3} option enables SSL v3.0, which is required +for some older clients that do not support TLS v1.0.") + #; + (ssl-port + (non-negative-integer 631) + "Listens on the specified port for encrypted connections.") + (strict-conformance? + (boolean #f) + "Specifies whether the scheduler requires clients to strictly adhere to the +IPP specifications.") + (timeout + (non-negative-integer 300) + "Specifies the HTTP request timeout, in seconds.") + (web-interface? + (boolean #f) + "Specifies whether the web interface is enabled.")) + +(define-configuration opaque-cups-configuration + (cups + (package cups) + "The CUPS package.") + (extensions + (package-list '()) + "Drivers and other extensions to the CUPS package.") + (cupsd.conf + (string (cups-configuration-missing-field 'opaque-cups-configuration + 'cupsd.conf)) + "The contents of the @code{cupsd.conf} to use.") + (cups-files.conf + (string (cups-configuration-missing-field 'opaque-cups-configuration + 'cups-files.conf)) + "The contents of the @code{cups-files.conf} to use.")) + +(define %cups-activation + ;; Activation gexp. + (with-imported-modules '((guix build utils)) + #~(begin + (define (mkdir-p/perms directory owner perms) + (mkdir-p directory) + (chown "/var/run/cups" (passwd:uid owner) (passwd:gid owner)) + (chmod directory perms)) + (define (build-subject parameters) + (string-concatenate + (map (lambda (pair) + (let ((k (car pair)) (v (cdr pair))) + (define (escape-char str chr) + (string-join (string-split str chr) (string #\\ chr))) + (string-append "/" k "=" + (escape-char (escape-char v #\=) #\/)))) + (filter (lambda (pair) (cdr pair)) parameters)))) + (define* (create-self-signed-certificate-if-absent + #:key private-key public-key (owner (getpwnam "root")) + (common-name (gethostname)) + (organization-name "GuixSD") + (organization-unit-name "Default Self-Signed Certificate") + (subject-parameters `(("CN" . ,common-name) + ("O" . ,organization-name) + ("OU" . ,organization-unit-name))) + (subject (build-subject subject-parameters))) + ;; Note that by default, OpenSSL outputs keys in PEM format. This + ;; is what we want. + (unless (file-exists? private-key) + (cond + ((zero? (system* (string-append #$openssl "/bin/openssl") + "genrsa" "-out" private-key "2048")) + (chown private-key (passwd:uid owner) (passwd:gid owner)) + (chmod private-key #o400)) + (else + (format (current-error-port) + "Failed to create private key at ~a.\n" private-key)))) + (unless (file-exists? public-key) + (cond + ((zero? (system* (string-append #$openssl "/bin/openssl") + "req" "-new" "-x509" "-key" private-key + "-out" public-key "-days" "3650" + "-batch" "-subj" subject)) + (chown public-key (passwd:uid owner) (passwd:gid owner)) + (chmod public-key #o444)) + (else + (format (current-error-port) + "Failed to create public key at ~a.\n" public-key))))) + (let ((user (getpwnam "lp"))) + (mkdir-p/perms "/var/run/cups" user #o755) + (mkdir-p/perms "/var/spool/cups" user #o755) + (mkdir-p/perms "/var/spool/cups/tmp" user #o755) + (mkdir-p/perms "/var/log/cups" user #o755) + (mkdir-p/perms "/etc/cups" user #o755) + (mkdir-p/perms "/etc/cups/ssl" user #o700) + ;; This certificate is used for HTTPS connections to the CUPS web + ;; interface. + (create-self-signed-certificate-if-absent + #:private-key "/etc/cups/ssl/localhost.key" + #:public-key "/etc/cups/ssl/localhost.crt" + #:owner (getpwnam "root") + #:common-name (format #f "CUPS service on ~a" (gethostname))))))) + +(define (union-directory name packages paths) + (computed-file + name + (with-imported-modules '((guix build utils)) + #~(begin + (use-modules (guix build utils) + (srfi srfi-1)) + (mkdir #$output) + (for-each + (lambda (package) + (for-each + (lambda (path) + (for-each + (lambda (src) + (let* ((tail (substring src (string-length package))) + (dst (string-append #$output tail))) + (mkdir-p (dirname dst)) + ;; CUPS currently symlinks in some data from cups-filters + ;; to its output dir. Probably we should stop doing this + ;; and instead rely only on the CUPS service to union the + ;; relevant set of CUPS packages. + (if (file-exists? dst) + (format (current-error-port) "warning: ~a exists\n" dst) + (symlink src dst)))) + (find-files (string-append package path)))) + (list #$@paths))) + (list #$@packages)) + #t)))) + +(define (cups-server-bin-directory extensions) + "Return the CUPS ServerBin directory, containing binaries for CUPS and all +extensions that it uses." + (union-directory "cups-server-bin" extensions + ;; /bin + '("/lib/cups" "/share/ppd" "/share/cups"))) + +(define (cups-shepherd-service config) + "Return a list of <shepherd-service> for CONFIG." + (let* ((cupsd.conf-str + (cond + ((opaque-cups-configuration? config) + (opaque-cups-configuration-cupsd.conf config)) + (else + (with-output-to-string + (lambda () + (serialize-configuration config + cups-configuration-fields)))))) + (cups-files.conf-str + (cond + ((opaque-cups-configuration? config) + (opaque-cups-configuration-cups-files.conf config)) + (else + (with-output-to-string + (lambda () + (serialize-configuration + (cups-configuration-files-configuration config) + files-configuration-fields)))))) + (cups (if (opaque-cups-configuration? config) + (opaque-cups-configuration-cups config) + (cups-configuration-cups config))) + (server-bin + (cups-server-bin-directory + (cons cups + (cond + ((opaque-cups-configuration? config) + (opaque-cups-configuration-extensions config)) + (else + (cups-configuration-extensions config)))))) + ;;"SetEnv PATH " server-bin "/bin" "\n" + (cupsd.conf + (plain-file "cupsd.conf" cupsd.conf-str)) + (cups-files.conf + (mixed-text-file + "cups-files.conf" + cups-files.conf-str + "CacheDir /var/cache/cups\n" + "StateDir /var/run/cups\n" + "DataDir " server-bin "/share/cups" "\n" + "ServerBin " server-bin "/lib/cups" "\n"))) + (list (shepherd-service + (documentation "Run the CUPS print server.") + (provision '(cups)) + (requirement '(networking)) + (start #~(make-forkexec-constructor + (list (string-append #$cups "/sbin/cupsd") + "-f" "-c" #$cupsd.conf "-s" #$cups-files.conf))) + (stop #~(make-kill-destructor)))))) + +(define cups-service-type + (service-type (name 'cups) + (extensions + (list (service-extension shepherd-root-service-type + cups-shepherd-service) + (service-extension activation-service-type + (const %cups-activation)) + (service-extension account-service-type + (const %cups-accounts)))) + + ;; Extensions consist of lists of packages (representing CUPS + ;; drivers, etc) that we just concatenate. + (compose append) + + ;; Add extension packages by augmenting the cups-configuration + ;; 'extensions' field. + (extend + (lambda (config extensions) + (cond + ((cups-configuration? config) + (cups-configuration + (inherit config) + (extensions + (append (cups-configuration-extensions config) + extensions)))) + (else + (opaque-cups-configuration + (inherit config) + (extensions + (append (opaque-cups-configuration-extensions config) + extensions))))))))) + +;; A little helper to make it easier to document all those fields. +(define (generate-documentation) + (define documentation + `((cups-configuration + ,cups-configuration-fields + (files-configuration files-configuration) + (policies policy-configuration) + (location-access-controls location-access-controls)) + (files-configuration ,files-configuration-fields) + (policy-configuration + ,policy-configuration-fields + (operation-access-controls operation-access-controls)) + (location-access-controls + ,location-access-control-fields + (method-access-controls method-access-controls)) + (operation-access-controls ,operation-access-control-fields) + (method-access-controls ,method-access-control-fields))) + (define (str x) (object->string x)) + (define (generate configuration-name) + (match (assq-ref documentation configuration-name) + ((fields . sub-documentation) + `((para "Available " (code ,(str configuration-name)) " fields are:") + ,@(map + (lambda (f) + (let ((field-name (configuration-field-name f)) + (field-type (configuration-field-type f)) + (field-docs (cdr (texi-fragment->stexi + (configuration-field-documentation f)))) + (default (catch #t + (configuration-field-default-value-thunk f) + (lambda _ '%invalid)))) + (define (show-default? val) + (or (string? default) (number? default) (boolean? default) + (and (symbol? val) (not (eq? val '%invalid))) + (and (list? val) (and-map show-default? val)))) + `(deftypevr (% (category + (code ,(str configuration-name)) " parameter") + (data-type ,(str field-type)) + (name ,(str field-name))) + ,@field-docs + ,@(if (show-default? default) + `((para "Defaults to " (samp ,(str default)) ".")) + '()) + ,@(append-map + generate + (or (assq-ref sub-documentation field-name) '()))))) + fields))))) + (stexi->texi `(*fragment* . ,(generate 'cups-configuration)))) |