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0adfe95a | 1 | ;;; GNU Guix --- Functional package management for GNU |
3e8d037b | 2 | ;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org> |
64643b90 | 3 | ;;; Copyright © 2015 Sou Bunnbu <iyzsong@gmail.com> |
0adfe95a LC |
4 | ;;; |
5 | ;;; This file is part of GNU Guix. | |
6 | ;;; | |
7 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
8 | ;;; under the terms of the GNU General Public License as published by | |
9 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
10 | ;;; your option) any later version. | |
11 | ;;; | |
12 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
13 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;;; GNU General Public License for more details. | |
16 | ;;; | |
17 | ;;; You should have received a copy of the GNU General Public License | |
18 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
19 | ||
20 | (define-module (gnu services dbus) | |
21 | #:use-module (gnu services) | |
0190c1c0 | 22 | #:use-module (gnu services shepherd) |
0adfe95a | 23 | #:use-module (gnu system shadow) |
2e328698 | 24 | #:use-module (gnu system pam) |
f5a91039 | 25 | #:use-module ((gnu packages glib) #:select (dbus)) |
2e328698 | 26 | #:use-module (gnu packages polkit) |
0adfe95a LC |
27 | #:use-module (gnu packages admin) |
28 | #:use-module (guix gexp) | |
29 | #:use-module (guix records) | |
30 | #:use-module (srfi srfi-1) | |
31 | #:use-module (ice-9 match) | |
24e96431 TČ |
32 | #:export (dbus-configuration |
33 | dbus-configuration? | |
34 | dbus-root-service-type | |
2e328698 LC |
35 | dbus-service |
36 | ||
37 | polkit-service-type | |
38 | polkit-service)) | |
0adfe95a LC |
39 | |
40 | ;;; | |
41 | ;;; D-Bus. | |
42 | ;;; | |
43 | ||
44 | (define-record-type* <dbus-configuration> | |
45 | dbus-configuration make-dbus-configuration | |
46 | dbus-configuration? | |
47 | (dbus dbus-configuration-dbus ;<package> | |
f5a91039 | 48 | (default dbus)) |
0adfe95a LC |
49 | (services dbus-configuration-services ;list of <package> |
50 | (default '()))) | |
51 | ||
cde04021 LC |
52 | (define (system-service-directory services) |
53 | "Return the system service directory, containing @code{.service} files for | |
54 | all the services that may be activated by the daemon." | |
55 | (computed-file "dbus-system-services" | |
4ee96a79 LC |
56 | (with-imported-modules '((guix build utils)) |
57 | #~(begin | |
58 | (use-modules (guix build utils) | |
59 | (srfi srfi-1)) | |
cde04021 | 60 | |
4ee96a79 LC |
61 | (define files |
62 | (append-map (lambda (service) | |
63 | (find-files | |
64 | (string-append | |
65 | service | |
66 | "/share/dbus-1/system-services") | |
67 | "\\.service$")) | |
68 | (list #$@services))) | |
cde04021 | 69 | |
4ee96a79 LC |
70 | (mkdir #$output) |
71 | (for-each (lambda (file) | |
72 | (symlink file | |
73 | (string-append #$output "/" | |
74 | (basename file)))) | |
75 | files) | |
76 | #t)))) | |
cde04021 | 77 | |
64643b90 SB |
78 | (define (dbus-configuration-directory services) |
79 | "Return a directory contains the @code{system-local.conf} file for DBUS that | |
80 | includes the @code{etc/dbus-1/system.d} directories of each package listed in | |
0adfe95a LC |
81 | @var{services}." |
82 | (define build | |
83 | #~(begin | |
84 | (use-modules (sxml simple) | |
85 | (srfi srfi-1)) | |
86 | ||
87 | (define (services->sxml services) | |
88 | ;; Return the SXML 'includedir' clauses for DIRS. | |
89 | `(busconfig | |
cde04021 LC |
90 | (servicehelper "/run/setuid-programs/dbus-daemon-launch-helper") |
91 | ||
92 | ;; First, the '.service' files of services subject to activation. | |
93 | ;; We use a fixed location under /etc because the setuid helper | |
94 | ;; looks for them in that location and nowhere else. See | |
95 | ;; <https://bugs.freedesktop.org/show_bug.cgi?id=92458>. | |
96 | (servicedir "/etc/dbus-1/system-services") | |
97 | ||
0adfe95a LC |
98 | ,@(append-map (lambda (dir) |
99 | `((includedir | |
100 | ,(string-append dir "/etc/dbus-1/system.d")) | |
cde04021 LC |
101 | (servicedir ;for '.service' files |
102 | ,(string-append dir "/share/dbus-1/services")))) | |
0adfe95a LC |
103 | services))) |
104 | ||
105 | (mkdir #$output) | |
cde04021 LC |
106 | |
107 | ;; Provide /etc/dbus-1/system-services, which is where the setuid | |
108 | ;; helper looks for system service files. | |
109 | (symlink #$(system-service-directory services) | |
110 | (string-append #$output "/system-services")) | |
111 | ||
0adfe95a LC |
112 | ;; 'system-local.conf' is automatically included by the default |
113 | ;; 'system.conf', so this is where we stuff our own things. | |
114 | (call-with-output-file (string-append #$output "/system-local.conf") | |
115 | (lambda (port) | |
116 | (sxml->xml (services->sxml (list #$@services)) | |
117 | port))))) | |
118 | ||
119 | (computed-file "dbus-configuration" build)) | |
120 | ||
64643b90 SB |
121 | (define (dbus-etc-files config) |
122 | "Return a list of FILES for @var{etc-service-type} to build the | |
123 | @code{/etc/dbus-1} directory." | |
124 | (list `("dbus-1" ,(dbus-configuration-directory | |
125 | (dbus-configuration-services config))))) | |
126 | ||
0adfe95a LC |
127 | (define %dbus-accounts |
128 | ;; Accounts used by the system bus. | |
129 | (list (user-group (name "messagebus") (system? #t)) | |
130 | (user-account | |
131 | (name "messagebus") | |
132 | (group "messagebus") | |
133 | (system? #t) | |
134 | (comment "D-Bus system bus user") | |
135 | (home-directory "/var/run/dbus") | |
9e41130b | 136 | (shell (file-append shadow "/sbin/nologin"))))) |
0adfe95a | 137 | |
cde04021 LC |
138 | (define dbus-setuid-programs |
139 | ;; Return the file name of the setuid program that we need. | |
140 | (match-lambda | |
141 | (($ <dbus-configuration> dbus services) | |
9e41130b | 142 | (list (file-append dbus "/libexec/dbus-daemon-launch-helper"))))) |
cde04021 | 143 | |
0adfe95a LC |
144 | (define (dbus-activation config) |
145 | "Return an activation gexp for D-Bus using @var{config}." | |
146 | #~(begin | |
147 | (use-modules (guix build utils)) | |
148 | ||
149 | (mkdir-p "/var/run/dbus") | |
150 | ||
151 | (let ((user (getpwnam "messagebus"))) | |
152 | (chown "/var/run/dbus" | |
153 | (passwd:uid user) (passwd:gid user))) | |
154 | ||
155 | (unless (file-exists? "/etc/machine-id") | |
156 | (format #t "creating /etc/machine-id...~%") | |
157 | (let ((prog (string-append #$(dbus-configuration-dbus config) | |
158 | "/bin/dbus-uuidgen"))) | |
159 | ;; XXX: We can't use 'system' because the initrd's | |
160 | ;; guile system(3) only works when 'sh' is in $PATH. | |
161 | (let ((pid (primitive-fork))) | |
162 | (if (zero? pid) | |
163 | (call-with-output-file "/etc/machine-id" | |
164 | (lambda (port) | |
165 | (close-fdes 1) | |
166 | (dup2 (port->fdes port) 1) | |
167 | (execl prog))) | |
168 | (waitpid pid))))))) | |
169 | ||
d4053c71 | 170 | (define dbus-shepherd-service |
4a663ca4 LC |
171 | (match-lambda |
172 | (($ <dbus-configuration> dbus) | |
d4053c71 | 173 | (list (shepherd-service |
4a663ca4 LC |
174 | (documentation "Run the D-Bus system daemon.") |
175 | (provision '(dbus-system)) | |
176 | (requirement '(user-processes)) | |
177 | (start #~(make-forkexec-constructor | |
178 | (list (string-append #$dbus "/bin/dbus-daemon") | |
b9bb50c6 LC |
179 | "--nofork" "--system") |
180 | #:pid-file "/var/run/dbus/pid")) | |
4a663ca4 | 181 | (stop #~(make-kill-destructor))))))) |
0adfe95a LC |
182 | |
183 | (define dbus-root-service-type | |
184 | (service-type (name 'dbus) | |
185 | (extensions | |
d4053c71 AK |
186 | (list (service-extension shepherd-root-service-type |
187 | dbus-shepherd-service) | |
0adfe95a LC |
188 | (service-extension activation-service-type |
189 | dbus-activation) | |
64643b90 SB |
190 | (service-extension etc-service-type |
191 | dbus-etc-files) | |
0adfe95a | 192 | (service-extension account-service-type |
cde04021 LC |
193 | (const %dbus-accounts)) |
194 | (service-extension setuid-program-service-type | |
195 | dbus-setuid-programs))) | |
0adfe95a LC |
196 | |
197 | ;; Extensions consist of lists of packages (representing D-Bus | |
198 | ;; services) that we just concatenate. | |
0adfe95a LC |
199 | (compose concatenate) |
200 | ||
201 | ;; The service's parameters field is extended by augmenting | |
202 | ;; its <dbus-configuration> 'services' field. | |
203 | (extend (lambda (config services) | |
204 | (dbus-configuration | |
205 | (inherit config) | |
206 | (services | |
207 | (append (dbus-configuration-services config) | |
3e8d037b LC |
208 | services))))) |
209 | ||
210 | (default-value (dbus-configuration)))) | |
0adfe95a | 211 | |
f5a91039 | 212 | (define* (dbus-service #:key (dbus dbus) (services '())) |
0adfe95a LC |
213 | "Return a service that runs the \"system bus\", using @var{dbus}, with |
214 | support for @var{services}. | |
215 | ||
216 | @uref{http://dbus.freedesktop.org/, D-Bus} is an inter-process communication | |
217 | facility. Its system bus is used to allow system services to communicate and | |
218 | be notified of system-wide events. | |
219 | ||
220 | @var{services} must be a list of packages that provide an | |
221 | @file{etc/dbus-1/system.d} directory containing additional D-Bus configuration | |
222 | and policy files. For example, to allow avahi-daemon to use the system bus, | |
223 | @var{services} must be equal to @code{(list avahi)}." | |
224 | (service dbus-root-service-type | |
225 | (dbus-configuration (dbus dbus) | |
226 | (services services)))) | |
227 | ||
2e328698 LC |
228 | \f |
229 | ;;; | |
230 | ;;; Polkit privilege management service. | |
231 | ;;; | |
232 | ||
233 | (define-record-type* <polkit-configuration> | |
234 | polkit-configuration make-polkit-configuration | |
235 | polkit-configuration? | |
236 | (polkit polkit-configuration-polkit ;<package> | |
237 | (default polkit)) | |
238 | (actions polkit-configuration-actions ;list of <package> | |
239 | (default '()))) | |
240 | ||
241 | (define %polkit-accounts | |
242 | (list (user-group (name "polkitd") (system? #t)) | |
243 | (user-account | |
244 | (name "polkitd") | |
245 | (group "polkitd") | |
246 | (system? #t) | |
247 | (comment "Polkit daemon user") | |
248 | (home-directory "/var/empty") | |
249 | (shell "/run/current-system/profile/sbin/nologin")))) | |
250 | ||
251 | (define %polkit-pam-services | |
252 | (list (unix-pam-service "polkit-1"))) | |
253 | ||
254 | (define (polkit-directory packages) | |
255 | "Return a directory containing an @file{actions} and possibly a | |
256 | @file{rules.d} sub-directory, for use as @file{/etc/polkit-1}." | |
257 | (with-imported-modules '((guix build union)) | |
258 | (computed-file "etc-polkit-1" | |
259 | #~(begin | |
260 | (use-modules (guix build union) (srfi srfi-26)) | |
261 | ||
262 | (union-build #$output | |
263 | (map (cut string-append <> | |
264 | "/share/polkit-1") | |
265 | (list #$@packages))))))) | |
266 | ||
267 | (define polkit-etc-files | |
268 | (match-lambda | |
269 | (($ <polkit-configuration> polkit packages) | |
270 | `(("polkit-1" ,(polkit-directory (cons polkit packages))))))) | |
271 | ||
272 | (define polkit-setuid-programs | |
273 | (match-lambda | |
274 | (($ <polkit-configuration> polkit) | |
275 | (list (file-append polkit "/lib/polkit-1/polkit-agent-helper-1") | |
276 | (file-append polkit "/bin/pkexec"))))) | |
277 | ||
278 | (define polkit-service-type | |
279 | (service-type (name 'polkit) | |
280 | (extensions | |
281 | (list (service-extension account-service-type | |
282 | (const %polkit-accounts)) | |
283 | (service-extension pam-root-service-type | |
284 | (const %polkit-pam-services)) | |
285 | (service-extension dbus-root-service-type | |
286 | (compose | |
287 | list | |
288 | polkit-configuration-polkit)) | |
289 | (service-extension etc-service-type | |
290 | polkit-etc-files) | |
291 | (service-extension setuid-program-service-type | |
292 | polkit-setuid-programs))) | |
293 | ||
294 | ;; Extensions are lists of packages that provide polkit rules | |
295 | ;; or actions under share/polkit-1/{actions,rules.d}. | |
296 | (compose concatenate) | |
297 | (extend (lambda (config actions) | |
298 | (polkit-configuration | |
299 | (inherit config) | |
300 | (actions | |
301 | (append (polkit-configuration-actions config) | |
3e8d037b LC |
302 | actions))))) |
303 | ||
304 | (default-value (polkit-configuration)))) | |
2e328698 LC |
305 | |
306 | (define* (polkit-service #:key (polkit polkit)) | |
307 | "Return a service that runs the | |
308 | @uref{http://www.freedesktop.org/wiki/Software/polkit/, Polkit privilege | |
309 | management service}, which allows system administrators to grant access to | |
310 | privileged operations in a structured way. By querying the Polkit service, a | |
311 | privileged system component can know when it should grant additional | |
312 | capabilities to ordinary users. For example, an ordinary user can be granted | |
313 | the capability to suspend the system if the user is logged in locally." | |
314 | (service polkit-service-type | |
315 | (polkit-configuration (polkit polkit)))) | |
316 | ||
0adfe95a | 317 | ;;; dbus.scm ends here |