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
|
(define-module (webid-oidc reverse-proxy)
#:use-module (webid-oidc errors)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module (webid-oidc resource-server)
#:use-module (webid-oidc jti)
#:use-module ((webid-oidc config) #:prefix cfg:)
#:use-module (ice-9 optargs)
#:use-module (ice-9 receive)
#:use-module (ice-9 i18n)
#:use-module (ice-9 getopt-long)
#:use-module (ice-9 suspendable-ports)
#:use-module (srfi srfi-19)
#:use-module (rnrs bytevectors)
#:use-module (web uri)
#:use-module (web request)
#:use-module (web response)
#:use-module (web client)
#:use-module (webid-oidc cache)
#:use-module (web server))
(define (G_ text)
(let ((out (gettext text)))
(if (string=? out text)
;; No translation, disambiguate
(car (reverse (string-split text #\|)))
out)))
(define*-public (make-reverse-proxy
#:key
(jti-list #f)
(server-uri #f)
(current-time current-time)
(http-get http-get)
(endpoint #f)
(auth-header 'XXX-Agent))
(set! auth-header
;; We need to remove the lowercase version of auth-header from
;; all incoming requests!
(string->symbol
(string-downcase
(symbol->string auth-header))))
(define authenticate
(make-authenticator
(or jti-list (make-jti-list))
#:server-uri server-uri
#:current-time current-time
#:http-get http-get))
(unless (and endpoint (uri? endpoint))
(error "#:endpoint argument is not present or not an URI."))
(lambda (request request-body)
(let ((agent
(catch #t
(lambda ()
(authenticate request request-body))
(lambda (key . args)
(case key
((invalid-access-token
invalid-proof
unconfirmed-issuer)
#f)
(else
(apply throw key args)))))))
(let ((raw-headers (request-headers request)))
(let ((modified-headers
(append
(if agent
(list (cons auth-header (uri->string agent)))
'())
(filter
(lambda (h)
(not (eq? (car h) auth-header)))
raw-headers))))
(let ((modified-request
(build-request
(request-uri request)
#:method (request-method request)
#:headers modified-headers)))
(let ((port (open-socket-for-uri endpoint)))
(let ((request-with-port
(write-request modified-request port)))
(when request-body
(unless (bytevector? request-body)
(set! request-body (string->utf8 request-body)))
(write-request-body request-with-port request-body))
(force-output (request-port request-with-port))
(let ((response (read-response port)))
(let ((response-body
(or (response-must-not-include-body? response)
(read-response-body response))))
(let ((adapted-response
(build-response
#:code (response-code response)
#:reason-phrase (response-reason-phrase response)
#:headers
(append
(if (eqv? (response-code response) 401)
(list (cons 'www-authenticate '((DPoP))))
'())
(response-headers response)))))
(close-port port)
(values adapted-response response-body))))))))))))
(define-public (main)
(define* (http-get-with-log uri #:key (headers '()))
(define date (date->string (time-utc->date (current-time))))
(define uri-string (if (uri? uri) (uri->string uri) uri))
(format (current-error-port) "~a: GET ~a ~s...\n"
date uri-string headers)
(receive (response response-body) (http-get uri #:headers headers)
(format (current-error-port) "~a: GET ~a ~s: ~s ~a bytes\n"
date uri-string headers response
(if (bytevector? response-body)
(bytevector-length response-body)
(string-length response-body)))
(values response response-body)))
(define cache-http-get
(with-cache #:http-get http-get-with-log))
(setvbuf (current-output-port) 'none)
(setvbuf (current-error-port) 'none)
(setlocale LC_ALL "")
(bindtextdomain cfg:package cfg:localedir)
(textdomain cfg:package)
(let ((version-sym
(string->symbol (G_ "command-line|version")))
(help-sym
(string->symbol (G_ "command-line|help")))
(port-sym
(string->symbol (G_ "command-line|port")))
(inbound-uri-sym
(string->symbol (G_ "command-line|inbound-uri")))
(outbound-uri-sym
(string->symbol (G_ "command-line|outbound-uri")))
(header-sym
(string->symbol (G_ "command-line|header")))
(log-file-sym
(string->symbol (G_ "comand-line|log-file")))
(error-file-sym
(string->symbol (G_ "comand-line|error-file"))))
(let ((options
(let ((option-spec
`((,version-sym (single-char #\v) (value #f))
(,help-sym (single-char #\h) (value #f))
(,port-sym (single-char #\p) (value #t))
(,inbound-uri-sym (single-char #\i) (value #t))
(,outbound-uri-sym (single-char #\o) (value #t))
(,header-sym (single-char #\H) (value #t))
(,log-file-sym (single-char #\l) (value #t))
(,error-file-sym (single-char #\e) (value #t)))))
(getopt-long (command-line) option-spec))))
(cond
((option-ref options help-sym #f)
(format #t (G_ "Usage: ~a [OPTIONS]...
Run a reverse proxy, taking requests with webid-oidc authentication
and passing them to the outbound URI with an additional header
containing the webid of the agent.
Options:
-h, --~a:
display this help message and exit.
-v, --~a:
display the version information (~a) and exit.
-p PORT, --~a=8080:
set the port to bind.
-i URI, --~a=URI:
set the public URI of the reverse proxy.
-o URI, --~a=URI:
pass the requests to the server running at URI.
-H HEADER, --~a=HEADER:
pass request with optional HEADER set to the webid, XXX-Agent by default.
-l FILE.log, --~a=FILE.log:
dump the standard output to that file.
-e FILE.err, --~a=FILE.err:
dump the standard error to that file.
Environment variables:
LANG: set the locale of the sysadmin-facing interface. It is
currently ~a.
Example:
Suppose that you operate data.provider.com. Since everything is behind
a big global reverse proxy, the authenticated proxy listens on
http://localhost:8080. You have the data server running at
https://private.data.provider.com, set up so that only you can query
it. The private server needs the XXX-Agent header to contain the
authenticated webid of the user, if the user is authenticated. That’s
why you don’t want anyone to query it. You would run:
export LANG=C
webid-oidc-reverse-proxy \\
--port 8080 \\
--inbound-uri https://data.provider.com \\
--outbound-uri https://private.data.provider.com \\
--header XXX-Agent \\
--log-file /var/log/proxy.log \\
--error-file /var/log/proxy.err
If you find a bug, send a report to ~a.
")
(car (command-line))
help-sym version-sym
cfg:version
port-sym inbound-uri-sym outbound-uri-sym header-sym
log-file-sym error-file-sym
(or (getenv "LANG") "")
cfg:package-bugreport))
((option-ref options version-sym #f)
(format #t (G_ "~a version ~a\n")
cfg:package cfg:version))
(else
(let ((port-string
(option-ref options port-sym "8080"))
(inbound-uri-string
(option-ref options inbound-uri-sym #f))
(outbound-uri-string
(option-ref options outbound-uri-sym #f))
(header-string
(option-ref options header-sym "XXX-Agent"))
(log-file-string
(option-ref options log-file-sym #f))
(error-file-string
(option-ref options error-file-sym #f)))
(when log-file-string
(set-current-output-port (stubs:open-output-file* log-file-string))
(setvbuf (current-output-port) 'none))
(when error-file-string
(set-current-error-port (stubs:open-output-file* error-file-string))
(setvbuf (current-error-port) 'none))
(unless (and port-string
(string? port-string)
(string->number port-string)
(integer? (string->number port-string))
(>= (string->number port-string) 0)
(<= (string->number port-string) 65535))
(format (current-error-port)
(G_ "The port should be a number between 0 and 65535.\n"))
(exit 1))
(unless (and inbound-uri-string
(string->uri inbound-uri-string))
(format (current-error-port)
(G_ "The public name of the server must be present (with scheme) as --inbound-uri.\n"))
(exit 1))
(unless (and outbound-uri-string
(string->uri outbound-uri-string))
(format (current-error-port)
(G_ "The address of the proxy must be present (with scheme) as --outbound-uri.\n"))
(exit 1))
(install-suspendable-ports!)
(run-server (make-reverse-proxy
#:server-uri (string->uri inbound-uri-string)
#:http-get cache-http-get
#:endpoint (string->uri outbound-uri-string)
#:auth-header (string->symbol header-string))
'http
(list #:port (string->number port-string)))))))))
|
