1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
|
(define-module (email-key-rotation)
#:use-module ((email-key-rotation dkim) #:prefix dkim:)
#:use-module ((email-key-rotation srs) #:prefix srs:)
#:use-module ((email-key-rotation dns) #:prefix dns:)
#:use-module ((email-key-rotation gandi) #:prefix gandi:)
#:use-module ((email-key-rotation openssl) #:prefix openssl:)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 match)
#:use-module (ice-9 receive)
#:use-module (ice-9 i18n)
#:use-module (srfi srfi-9 gnu)
#:use-module (sxml match)
#:use-module (sxml simple)
#:use-module (web client)
#:export (<configuration>
make-configuration
configuration?
dkim-state
srs-state
private-opensmtpd-config-file
dkim-current-selector-file
dkim-current-key-file
gandi-configuration
set-dkim-state
set-srs-state
set-private-opensmtpd-config-file
set-dkim-current-selector-file
set-dkim-current-key-file
set-gandi-configuration
sxml->configuration
xml->configuration
configuration->sxml
initialize
rotate
materialize)
#:declarative? #t)
(define (G_ msg) (gettext msg "email-key-rotation"))
(define-immutable-record-type <configuration>
(make-configuration/uninitialized dkim-state srs-state private-opensmtpd-config-file dkim-current-selector-file dkim-current-key-file gandi-configuration)
configuration?
(dkim-state dkim-state set-dkim-state)
(srs-state srs-state set-srs-state)
(private-opensmtpd-config-file private-opensmtpd-config-file set-private-opensmtpd-config-file)
(dkim-current-selector-file dkim-current-selector-file set-dkim-current-selector-file)
(dkim-current-key-file dkim-current-key-file set-dkim-current-key-file)
(gandi-configuration gandi-configuration set-gandi-configuration))
(define (make-configuration . args)
(bindtextdomain "email-key-rotation" "/usr/local/share/locale")
(apply make-configuration/uninitialized args))
(define (refine-configuration/one subtree config)
(sxml-match
subtree
((https://planete-kraus.eu/ns/email-key-rotation:with-dkim-state
,dkim-state)
(set-dkim-state config (dkim:sxml->key dkim-state)))
((https://planete-kraus.eu/ns/email-key-rotation:with-srs-state
,srs-state)
(set-srs-state config (srs:sxml->key srs-state)))
((https://planete-kraus.eu/ns/email-key-rotation:with-gandi-configuration
,gandi-config)
(set-gandi-configuration config (gandi:sxml->configuration gandi-config)))))
(define (refine-configuration subtrees config)
(match subtrees
(() config)
((st rest ...)
(refine-configuration rest (refine-configuration/one st config)))))
(define (essential-configuration-attributes tree)
(sxml-match
tree
((https://planete-kraus.eu/ns/email-key-rotation:configuration
(@ . ,attributes)
,state ...)
(values attributes (list state ...)))
((*TOP* ,true-thing)
(essential-configuration-attributes true-thing))))
(define car-if-true
(match-lambda
((x) x)
(_ #f)))
(define (assoc-ref/one alist key)
(car-if-true (assoc-ref alist key)))
(define (essential-configuration tree)
(receive (attributes subtrees)
(essential-configuration-attributes tree)
(let ((private-opensmtpd-config-file
(assoc-ref/one attributes
'private-opensmtpd-config-file))
(dkim-current-selector-file
(assoc-ref/one attributes
'dkim-current-selector-file))
(dkim-current-key-file
(assoc-ref/one attributes
'dkim-current-key-file)))
(values
(make-configuration
#f #f
private-opensmtpd-config-file
dkim-current-selector-file
dkim-current-key-file
#f)
subtrees))))
(define (sxml->configuration sxml)
(with-exception-handler
(lambda (exn)
(raise-exception
(make-exception
(make-error)
(make-exception-with-origin 'sxml->configuration)
(make-exception-with-irritants (list sxml))
(make-exception-with-message
(G_ "cannot read the XML fragment as a configuration."))
exn)))
(lambda ()
(receive (essential extra-state)
(essential-configuration sxml)
(refine-configuration extra-state essential)))))
(define* (xml->configuration #:optional (port (current-input-port)))
(with-exception-handler
(lambda (exn)
(raise-exception
(make-exception
(make-error)
(make-exception-with-origin 'xml->configuration)
(make-exception-with-irritants (list port))
(make-exception-with-message
(G_ "cannot read a configuration from file."))
exn)))
(lambda ()
(sxml->configuration
(xml->sxml port)))))
(define (configuration->sxml config)
(with-exception-handler
(lambda (exn)
(raise-exception
(make-exception
(make-exception-with-origin 'configuration->sxml)
(make-exception-with-irritants (list config))
(make-exception-with-message
(G_ "when converting a configuration to SXML:"))
exn)))
(lambda ()
(match config
(($ <configuration> dkim-state srs-state
private-opensmtpd-config-file
dkim-current-selector-file
dkim-current-key-file
gandi-configuration)
`(configuration
(@ (xmlns "https://planete-kraus.eu/ns/email-key-rotation")
(private-opensmtpd-config-file ,private-opensmtpd-config-file)
(dkim-current-selector-file ,dkim-current-selector-file)
(dkim-current-key-file ,dkim-current-key-file))
,@(if dkim-state
`((with-dkim-state ,(dkim:key->sxml dkim-state)))
'())
,@(if srs-state
`((with-srs-state ,(srs:key->sxml srs-state)))
'())
,@(if gandi-configuration
`((with-gandi-configuration ,(gandi:configuration->sxml gandi-configuration)))
'())))))))
(define* (materialize config-file output-port #:key (http-request http-request))
(with-exception-handler
(lambda (exn)
(raise-exception
(make-exception
(make-exception-with-irritants (list config-file))
(make-exception-with-message
(format #f (G_ "when materializing the configuration file:")))
exn)))
(lambda ()
(when (and (dkim-state config-file)
(dkim-current-key-file config-file))
(call-with-output-file (dkim-current-key-file config-file)
(lambda (port)
(dkim:write-private-key (dkim-state config-file) port))))
(when (and (dkim-state config-file)
(dkim-current-selector-file config-file))
(call-with-output-file (dkim-current-selector-file config-file)
(lambda (port)
(dkim:write-current-selector (dkim-state config-file) port))))
(when (and (dkim-state config-file)
(gandi-configuration config-file))
(for-each
(lambda (dns-record)
(with-exception-handler
(lambda (exn)
(raise-exception
(make-exception
(make-exception-with-irritants (list dns-record))
(make-exception-with-message
(format #f (G_ "when publishing ~a record for ~a:")
(dns:type dns-record)
(dns:name dns-record)))
exn)))
(lambda ()
(dns:publish-gandi-livedns (gandi-configuration config-file)
dns-record
#:http-request http-request))))
(dkim:dns-records (dkim-state config-file))))
(when (and (srs-state config-file)
(private-opensmtpd-config-file config-file))
(with-exception-handler
(lambda (exn)
(raise-exception
(make-exception
(make-exception-with-irritants (list config-file))
(make-exception-with-message
(format #f (G_ "when writing the private opensmtpd configuration file:")))
exn)))
(lambda ()
(call-with-output-file
(private-opensmtpd-config-file config-file)
(lambda (port)
(srs:write-private-opensmtpd-config (srs-state config-file)
port))))))
(when (file-port? output-port)
(chmod output-port #o600))
(seek output-port 0 SEEK_SET)
(sxml->xml
`(*TOP* ,(configuration->sxml config-file))
output-port)
(truncate-file output-port))))
(define* (initialize selectors private-opensmtpd-config-file dkim-current-selector-file dkim-current-key-file gandi-api-key gandi-domain
#:key (openssl-binary (openssl:current-openssl-binary)))
(with-exception-handler
(lambda (exn)
(raise-exception
(make-exception
(make-exception-with-origin 'initialize)
(make-exception-with-irritants (list selectors private-opensmtpd-config-file dkim-current-selector-file dkim-current-key-file gandi-api-key gandi-domain))
(make-exception-with-message
(G_ "when creating a new config file"))
exn)))
(lambda ()
(parameterize
((openssl:current-openssl-binary openssl-binary))
(make-configuration
(dkim:initialize selectors)
(srs:initialize)
private-opensmtpd-config-file
dkim-current-selector-file
dkim-current-key-file
(gandi:make-gandi-configuration gandi-api-key gandi-domain))))))
(define* (rotate configuration
#:key (openssl-binary (openssl:current-openssl-binary)))
(with-exception-handler
(lambda (exn)
(raise-exception
(make-exception
(make-exception-with-origin 'rotate)
(make-exception-with-irritants (list configuration))
(make-exception-with-message
(G_ "when rotating a config file"))
exn)))
(lambda ()
(parameterize
((openssl:current-openssl-binary openssl-binary))
(set-dkim-state
;; Rotate SRS key:
(set-srs-state
configuration
(and (srs-state configuration)
(srs:rotate (srs-state configuration))))
;; Done rotating SRS key, now do the DKIM key:
(and (dkim-state configuration)
(dkim:rotate (dkim-state configuration))))))))
|
