1 .TH radsecproxy.conf 5 "23 July 2008"
4 radsecproxy.conf - Radsec proxy configuration file
8 When the proxy server starts, it will first check the command line arguments,
9 and then read the configuration file. Normally radsecproxy will read the
10 configuration file \fB/etc/radsecproxy.conf\fR. The command line -c option can
11 be used to instead read an alternate file (see \fIradsecproxy(1)\fR for details).
13 If the configuration file can not be found, the proxy will exit with an error
14 message. Note that there is also an include facility so that any configuration
15 file may include other configuration files. The proxy will also exit on
18 .SH "CONFIGURATION SYNTAX"
19 When the configuration file is processed, whitespace (spaces and tabs) are
20 generally ignored. For each line, leading and trailing whitespace are ignored.
21 A line is ignored if it is empty, only consists of whitespace, or if the first
22 non-whitespace character is a \fB#\fR. The configuration is generally case
23 insensitive, but in some cases the option values (see below) are not.
25 There are two types of configuration structures than can be used. The first
26 and simplest are lines of the format \fIoption value\fR. That is, an option name,
27 see below for a list of valid options, followed by whitespace (at least one
28 space or tab character), followed by a value. Note that if the value contains
29 whitespace, then it must be quoted using "" or ''. Any whitespace in front of
30 the option or after the value will be ignored.
32 The other type of structure is a block. A block spans at least two lines, and
44 That is, some blocktype, see below for a list of the different block types, and
45 then enclosed in braces you have zero or more lines that each have the previously
46 described \fIoption value\fR format. Different block types have different rules for
47 which options can be specified, they are listed below. The rules regarding white
48 space, comments and quotes are as above. Hence you may do things like:
54 option "value with space"
60 There is one special option that can be used both as a basic option and inside all
61 blocks. That is the option \fBInclude\fR where the value specifies files to be
62 included. The value can be a single file, or it can use normal shell globbing to
63 specify multiple files, e.g.:
66 include /etc/radsecproxy.conf.d/*.conf
69 The files are sorted alphabetically. Included files are read in the order they are
70 specified, when reaching the end of a file, the next file is read. When reaching
71 the end of the last included file, the proxy returns to read the next line
72 following the \fBInclude\fR option. Included files may again include other files.
76 The following basic options may be specified in the configuration file. Note that
77 blocktypes and options inside blocks are discussed later. Note that none of these
78 options are required, and indeed in many cases they are not needed. Note that you
79 should specify each at most once. The behaviour with multiple occurences is
84 This option specifies the debug level. It must be set to 1, 2, 3 or 4, where 1
85 logs only serious errors, and 4 logs \fIeverything\fR. The default is 3 which logs
86 errors, warnings and some informational messages. Note that the command line option
87 \fB-d\fR overrides this if present.
91 This specifies where the log messages should go. By default the messages go to
92 syslog with facility \fBLOG_DAEMON\fR. Using this option you can specify another
93 syslog facility, or you may specify that logging should be to a particular file,
94 not using syslog. The value must be either a \fIfile\fR or \fIsyslog\fR URL. The
95 file URL is the standard one, specifying a local file that should be used. For
96 syslog, you must use the syntax: \fBx-syslog:///FACILITY\fR where
97 \fBFACILITY\fR must be one of \fBLOG_DAEMON\fR, \fBLOG_MAIL\fR, \fBLOG_USER\fR,
98 \fBLOG_LOCAL0\fR, \fBLOG_LOCAL1\fR, \fBLOG_LOCAL2\fR, \fBLOG_LOCAL3\fR,
99 \fBLOG_LOCAL4\fR, \fBLOG_LOCAL5\fR, \fBLOG_LOCAL6\fR or \fBLOG_LOCAL7\fR. You may
100 omit the facility from the URL to specify logging to the default facility, but
101 this is not very useful since this is the default log destination. Note that this
102 option is ignored if \fB-f\fR is specified on the command line.
106 Normally the proxy will listen to the standard RADIUS UDP port \fB1812\fR if
107 configured to handle UDP clients. On most systems it will do this for all of the
108 system's IP addresses (both IPv4 and IPv6). On some systems however, it may respond
109 to only IPv4 or only IPv6. To specify an alternate port you may use a value of
110 the form \fB*:port\fR where port is any valid port number. If you also want to
111 specify a specific address you can do e.g. \fB192.168.1.1:1812\fR or
112 \fB[2001:db8::1]:1812\fR. The port may be omitted if you want the default one
113 (like in these examples). These examples are equivalent to \fB192.168.1.1\fR and
114 \fB2001:db8::1\fR. Note that you must use brackets around the IPv6 address if
115 you specify port number.
119 This is similar to the \fBListenUDP\fR option, except that it used for receiving
120 connections from TCP clients. The default port number is \fB2083\fR.
123 \fBListenAccountingUDP\fR
124 This is similar to the \fBListenUDP\fR option, except that it used for specifying
125 port and optionally the address to receive UDP Accounting messages on.
129 This can be used to specify source address and/or source port that the proxy
130 will use for sending UDP client messages (e.g. Access Request).
134 This can be used to specify source address and/or source port that the proxy
135 will use for sending TCP client messages (e.g. Access Request).
139 This can be set to \fBon\fR or \fBoff\fR with \fBoff\fR being the default. When
140 this is enabled, a request will never be sent to a server named the same as the
141 client it was received from. I.e., the names of the client block and the server
142 block are compared. Note that this only gives limited protection against loops.
146 This is not a normal configuration option; it can be specified multiple times.
147 It can both be used as a basic option and inside blocks. For the full description,
148 see the configuration syntax section above.
152 There are five types of blocks, they are \fBClient\fR, \fBServer\fR, \fBRealm\fR,
153 \fBTLS\fR and \fBRewrite\fR. At least one instance of each of \fBClient\fR,
154 \fBServer\fR and \fBRealm\fR is required.
155 This is necessary for the proxy to do anything useful,
156 and it will exit if not. The \fBTLS\fR block is required if at least one TLS
157 client or server is configured. Note that there can be multiple blocks for each
158 type. For each type, the block names should be unique. The behaviour with multiple
159 occurences of the same name for the same block type is undefined. Also note that
160 some block option values may reference a block by name, in which case the block
161 name must be previously defined. Hence the order of the blocks may be significant.
165 The client block is used to configure a client. That is, tell the proxy about a
166 client, and what parameters should be used for that client. The \fBname\fR of the
167 client block must (with one exception, see below) be either the IP address
168 (IPv4 or IPv6) of the client, an IP prefix (IPv4 or IPv6) of the form
169 IpAddress/PrefixLength, or a domain name (FQDN).
171 If a domain name is specified,
172 then this will be resolved immediately to all the addresses associated with the
173 name, and the proxy will not care about any possible DNS changes that might occur
174 later. Hence there is no dependency on DNS after startup.
176 When some client later
177 sends a request to the proxy, the proxy will look at the IP address the request
178 comes from, and then go through all the addresses of each of the configured
179 clients (in the order they are defined), to determine which (if any) of the
182 In the case of TLS, the name of the client must match the FQDN or IP address in
183 the client certificate. Note that this is not required when the client name is
186 Alternatively one may use the \fBhost\fR option inside a client block. In that
187 case, the value of the \fBhost\fR option is used as above, while the name of the
188 block is only used as a descriptive name for the administrator.
190 The allowed options in a client block are \fBhost\fR, \fBtype\fR, \fBsecret\fR,
191 \fBtls\fR, \fBcertificatenamecheck\fR, \fBmatchcertificateattribute\fR,
192 \fBrewrite\fR and \fBrewriteattribute\fR. We already
193 discussed the \fBhost\fR option.
194 The value of \fBtype\fR must be either \fBudp\fR or \fBtls\fR. The value of
195 \fBsecret\fR is the shared RADIUS key used with this client. If the secret
196 contains whitespace, the value must be quoted. This option is optional for TLS.
198 For a TLS client you may also specify the \fBtls\fR option. The option value must
199 be the name of a previously defined TLS block. If this option is not specified,
200 the TLS block with the name \fBdefaultclient\fR will be used if defined. If not
201 defined, it will try to use the TLS block named \fBdefault\fR. If the specified
202 TLS block name does not exist, or the option is not specified and none of the
203 defaults exist, the proxy will exit with an error.
205 For a TLS client, the option \fBcertificatenamecheck\fR can be set to \fBoff\fR,
206 to disable the default behaviour of matching CN or SubjectAltName against the
207 specified hostname or IP address.
209 Additional validation of certificate attributes can be done by use of the
210 \fBmatchcertificateattribute\fR option. Currently one can only do some
211 matching of CN and SubjectAltName. For regexp matching on CN, one can use
212 the value \fBCN:/regexp/\fR. For SubjectAltName one can only do regexp
213 matching of the URI, this is specified as \fBSubjectAltName:URI:/regexp/\fR.
214 Note that currently this option can only be specified once in a client block.
216 The \fBrewrite\fR option can be used to refer to a rewrite block that
217 specifies certain rewrite operations that should be performed on messages
218 from the client. For details, see the rewrite block text below. Similar to
219 \fBtls\fR discussed above, if this option is not used, there is a fallback to
220 using the \fBrewrite\fR block named \fBdefaultclient\fR if it exists; and
221 finally, if not, a fallback to a block named \fBdefault\fR.
223 The \fBrewriteattribute\fR option currently makes it possible to specify that
224 the User-Name attribute in a client request shall be rewritten in the request
225 sent by the proxy. The User-Name attribute is written back to the original
226 value if a matching response is later sent back to the client. The value must
227 be of the form User-Name:/regexpmatch/replacement/. Example usage:
230 rewriteattribute User-Name:/^(.*)@local$/$1@example.com/
235 The server block is used to configure a server. That is, tell the proxy about
236 a server, and what parameters should be used when communicating with that server.
237 The \fBname\fR of the server block must (with one exception, see below) be either
238 the IP address (IPv4 or IPv6)
239 of the server, or a domain name (FQDN). If a domain name is specified, then this
240 will be resolved immediately to all the addresses associated with the name, and
241 the proxy will not care about any possible DNS changes that might occur later.
242 Hence there is no dependency on DNS after startup. If the domain name resolves
243 to multiple addresses, then for UDP the first address is used. For TLS, the proxy
244 will loop through the addresses until it can connect to one of them. In the case
245 of TLS, the name of the server must match the FQDN or IP address in the server
248 Alternatively one may use the \fBhost\fR option inside a server block. In that
249 case, the value of the \fBhost\fR option is used as above, while the name of the
250 block is only used as a descriptive name for the administrator.
252 The allowed options in a server block are \fBhost\fR, \fBport\fR, \fBtype\fR,
253 \fBsecret\fR, \fBtls\fR, \fBcertificatenamecheck\fR,
254 \fBmatchcertificateattribute\fR, \fBrewrite\fR, \fBstatusserver\fR,
255 \fBretrycount\fR and \fBretryinterval\fR.
257 We already discussed the \fBhost\fR option.
258 The \fBport\fR option allows you to specify which port number the server uses.
259 The values of \fBtype\fR, \fBsecret\fR, \fBtls\fR, \fBcertificatenamecheck\fR,
260 \fBmatchcertificateattribute\fR and \fBrewrite\fR are just as specified for the
261 \fIclient block\fR above, except that \fBdefaultserve\fRr
262 (and not \fBdefaultclient\fR) are fallbacks if either of the \fBtls\fR or
263 \fBrewrite\fR options are not used.
265 \fBstatusserver\fR can be specified to enable the use of status-server messages
266 for this server. The value must be either \fBon\fR or \fBoff\fR. The default
267 when not specified, is \fBoff\fR. If statusserver is enabled, the proxy will
268 during idle periods send regular status-server messages to the server to verify
269 that it is alive. This should only be enabled if the server supports it.
271 The options \fBretrycount\fR and \fBretryinterval\fR can be used to specify how
272 many times the proxy should retry sending a request and how long it should
273 wait between each retry. The defaults are 2 retries and an interval of 5s.
276 When the proxy receives an \fBAccess Request\fR it needs to figure out to which
277 server it should be forwarded. This is done by looking at the Username attribute
278 in the request, and matching that against the names of the defined realm blocks.
279 The proxy will match against the blocks in the order they are specified, using
280 the first match if any. If no realm matches, the proxy will simply ignore the
281 request. Each realm block specifies what the server should do when a match is
282 found. A realm block may contain none, one or multiple \fBserver\fR options,
283 and similarly \fBaccountingServer\fR options. There are also \fBreplyMessage\fR
284 and \fBAccountingResponse\fR options. We will discuss these later.
288 \fBRealm block names and matching\fR
290 In the general case the proxy will look for a @ in the username attribute, and
291 try to do an exact case insensitive match between what comes after the @ and
292 the name of the realm block. So if you get a request with the attribute value
293 \fBanonymous@example.com\fR, the proxy will go through the realm names in the
294 order they are specified, looking for a realm block named \fBexample.com\fR.
296 There are two exceptions to this, one is the realm name \fB*\fT which means
297 match everything. Hence if you have a realm block named \fB*\fR, then it will
298 always match. This should then be the last realm block defined, since any
299 blocks after this would never be checked. This is useful for having a default.
301 The other exception is regular expression matching. If the realm name starts
302 with a \fB/\fR, the name is treated as an regular expression. A case insensitive
303 regexp match will then be done using this regexp on the value of the entire
304 Username attribute. Optionally you may also have a trailing \fB/\fR after the
305 regexp. So as an example, if you want to use regexp matching the domain
306 \fBexample.com\fR you could have a realm block named \fB/@example\\.com$\fR.
307 Optinally this can also be written \fB/@example\\.com$/\fR. If you want to
308 match all domains under the \fB.com\fR top domain, you could do
309 \fB/@.*\\.com$\fR. Note that since the matching is done on the entire
310 attribute value, you can also use rules like \fB/^[a-k].*@example\\.com$/\fR
311 to get some of the users in this domain to use one server, while other users
312 could be matched by another realm block and use another server.
316 \fBRealm block options\fR
318 A realm block may contain none, one or multiple \fBserver\fR options. If
319 defined, the values of the \fBserver\fR options must be the names of
320 previously defined server blocks. Normally requests will be forwarded to
321 the first server option defined. If there are multiple server options, the
322 proxy will do fail-over and use the second server if the first is down. If
323 the two first are down, it will try the third etc. If say the first server
324 comes back up, it will go back to using that one. Currently detection of
325 servers being up or down is based on the use of StatusServer (if enabled),
326 and that TLS connections are up.
328 A realm block may also contain none, one or multiple \fBaccountingserver\fR
329 options. This is used exactly like the \fBserver\fR options, except that
330 it is used for specifying where to send matching accounting requests. The
331 values must be the names of previously defined server blocks. When multiple
332 accounting servers are defined, there is a failover mechanism similar to
333 the one for \fBserver\fR options.
335 If there is no \fBserver\fR option, the proxy will reply back to the client
336 with an Access Reject message. Note that this is different from having no
337 match since then the request is simply ignored. You may wonder why this is
338 useful. One example is if you handle say all domains under say \fB.bv\fR.
339 Then you may have several realm blocks matching the domains that exists,
340 while for other domains under \fB.bv\fR you want to send a reject. At the
341 same time you might want to send all other requests to some default server.
342 After the realms for the subdomains, you would then have two realm
343 definitions. One with the name \fB/@.*\\.bv$\fR with no servers, followed
344 by one with the name \fB*\fR with the default server defined. This may also
345 be useful for blocking particular usernames.
347 When sending reject messages, the proxy will check if the option
348 \fBreplyMessage\fR is set for the realm. If it is, it will add a replyMessage
349 attribute to the reject message with this value. Note that you need to quote
350 the message if it contains white space.
352 If there is no \fBaccountingserver\fR option, the proxy will normally do
353 nothing, ignoring accounting requests. There is however an option called
354 \fBAccountingResponse\fR. If this is set to \fBon\fR, the proxy will log
355 some of the accounting information and send an Accounting-Response back.
356 This is useful if you do not care much about accounting, but want to stop
357 clients from retransmitting accounting requests. By default this option
362 The TLS block specifies TLS configuration options and you need at least one
363 of these if you have clients or servers using TLS. As discussed in the client
364 and server block descriptions, a client or server block may reference a
365 particular TLS block by name. There are also however the special TLS block
366 names \fBdefault\fR, \fBdefaultclient\fR and \fBdefaultserver\fR which are
367 used as defaults if the client or server block does not reference a TLS block.
368 Also note that a TLS block must be defined before the client or server block
369 that would use it. If you want the same TLS configuration for all TLS clients
370 and servers, you need just a single TLS block named \fBdefault\fR, and the client
371 and servers need not refer to it. If you want all TLS clients to use one
372 config, and all TLS servers to use another, then you would be fine only
373 defining two TLS blocks named \fBdefaultclient\fR and \fBdefaultserver\fR.
374 If you want different clients (or different servers) to have different TLS
375 parameters, then you may need to create other TLS blocks with other names,
376 and reference those from the client or server definitions. Note that you could
377 also have say a client block refer to a default, even \fBdefaultserver\fR
378 if you really want to.
380 The available TLS block options are \fBCACertificateFile\fR,
381 \fBCACertificatePath\fR, \fBCertificateFile\fR, \fBCertificateKeyFile\fR,
382 \fBCertificateKeyPassword\fR and \fBCRLCheck\fR. When doing RADIUS over
384 client and the server present certificates, and they are both verified
385 by the peer. Hence you must always specify \fBCertificateFile\fR and
386 \fBCertificateKeyFile\fR options, as well as \fBCertificateKeyPassword\fR
387 if a password is needed to decrypt the private key. Note that
388 \fBCACertificateFile\fR may be a certificate chain. In order to verify
389 certificates, or send a chain of certificates to a peer, you also always
390 need to specify \fBCACertificateFile\fR or \fBCACertificatePath\fR. Note
391 that you may specify both, in which case the certificates in
392 \fBCACertificateFile\fR are checked first. By default CRLs are not
393 checked. This can be changed by setting \fBCRLCheck\fR to \fBon\fR.
396 The rewrite block specifies rules that may rewrite RADIUS messages. It
397 can currently be used to remove specific attributes from messages
398 received from clients or servers. As discussed in the client and server
399 block descriptions, a client or server block may reference a particular
400 rewrite block by name. There are also however the special rewrite block
401 names \fBdefault\fR, \fBdefaultclient\fR and \fBdefaultserver\fR which are
402 used as defaults if the client or server block does not reference a block.
403 Also note that a rewrite block must be defined before the client or server
404 block that would use it. If you want the same rewrite rules for all clients
405 and servers, you need just a single rewrite block named \fBdefault\fR, and
406 the client and servers need not refer to it. If you want all clients to use
407 one config, and all servers to use another, then you would be fine only
408 defining two rewrite blocks named \fBdefaultclient\fR and \fBdefaultserver\fR.
410 The available rewrite block options are \fBremoveattribute\fR and
411 \fBremovevendorattribute\fR, they can both be specified none, one or multiple
412 times. The \fBremoveattribute\fR option is used to specify an attribute that
413 should be removed from received messages. The option value must be a numerical
414 value specifying which attribute is to be removed. Similarly,
415 \fBremovevendorattribute\fR is used to specify a vendor attribute that is to
416 be removed. The value can be a numerical value for removing all attributes
417 from a given vendor, or of the form vendor:subattribute, where vendor and
418 subattribute are numerical values, for removing a specific subattribute for a
422 radsecproxy(1), RadSec draft paper.
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