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FreeRADIUS contains a wealth of options to define how requests are forwarded. These options are defined in the file /etc/raddb/proxy.conf. For a single eduroam SP, these may seem overkill, but the required definitions for that purpose are rather static. Assuming you have two upstream servers to forward requests to, the following configuration will set these up - you only need to change the IP addresses and shared secrets in home_server stanzas. The realm NULL will reject authentication requests missing an @ sign, for example Windows always first tries its domain\hostname to authenticate when connecting the first time to eduroam. This authentication would otherwise be sent upstream to the realm "~.+$", which causes delays and is unneeded.
| Code Block |
|---|
proxy server {
default_fallback = no
}
home_server antarctica-flr-1 {
type = auth+acct
ipaddr = 172.20.1.2
port = 1812
secret = secretstuff
status_check = status-server
}
home_server antarctica-flr-2 {
type = auth+acct
ipaddr = 172.25.9.3
port = 1812
secret = secretstuff
status_check = status-server
}
home_server_pool EDUROAM {
type = fail-over
home_server = antarctica-flr-1
home_server = antarctica-flr-2
}
realm "~.+$"NULL {
pool = EDUROAM
nostrip
virtual_server = auth-reject
nostrip
}
realm "~.+$" {
pool = EDUROAM
nostrip
}
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Goodies
Running FreeRADIUS as non-root user
...
| Code Block |
|---|
realm "~.+$" {
...
}
|
CUI for eduroam SP
To use the Chargeable-User-Identity (CUI) you must already use the Operator-Name attribute.
This documentation is only for FreeRADIUS 3.0.X release.
Create a log module
By default the CUI is not logged, you have to use the FreeRADIUS linelog module to get a log. In the mods-available/ subdirectory, create a new file "eduroam_cui_log" :
| Code Block |
|---|
linelog cui_log {
# filename = syslog
filename = ${logdir}/radius.log
format = ""
reference = "auth_log.%{%{reply:Packet-Type}:-format}"
auth_log {
Access-Accept = "%t : eduroam-auth#ORG=%{request:Realm}#USER=%{User-Name}#CSI=%{%{Calling-Station-Id}:-Unknown Caller Id}#NAS=%{%{Called-Station-Id}:-Unknown Access Point}#CUI=%{%{reply:Chargeable-User-Identity}:-Unknown}#MSG=%{%{EAP-Message}:-No EAP Message}#RESULT=OK#"
Access-Reject = "%t : eduroam-auth#ORG=%{request:Realm}#USER=%{User-Name}#CSI=%{%{Calling-Station-Id}:-Unknown Caller Id}#NAS=%{%{Called-Station-Id}:-Unknown Access Point}#CUI=%{%{reply:Chargeable-User-Identity}:-Unknown}#MSG=%{%{reply:Reply-Message}:-No Failure Reason}#RESULT=FAIL#"
}
} |
Enable modules
| Code Block |
|---|
cd mods-enabled; ln -s ../mods-available/eduroam_cui_log; ln -s ../mods-available/cui |
Client definition
Force parameter 'add_cui' to 'yes' for all your connected clients :
| Code Block |
|---|
client antarctica-access-point-1 {
...
add_cui = yes
} |
Policy
Edit the default policy.d/cui file :
| Code Block |
|---|
...
cui_hash_key = "changeme" # --> replace with a random string
# if you use a secondary or backup FreeRADIUS server, use the same cui_hash_key
# this allows you to keep the same CUI log even if the FreeRADIUS server change
cui_require_operator_name = "yes"
... |
Others values don't need to be changed.
Attributes
Edit mods-config/attr_filter/pre-proxy file, check that attributes Calling-Station-Id, Operator-Name and Chargeable-User-Identity are defined :
| Code Block |
|---|
DEFAULT
...
Calling-Station-Id =* ANY,
Operator-Name =* ANY,
Chargeable-User-Identity =* ANY,
... |
Edit mods-config/attr_filter/post-proxy file, check that the attributes User-Name and Chargeable-User-Identity are defined :
| Code Block |
|---|
DEFAULT
...
User-Name =* ANY,
Chargeable-User-Identity =* ANY,
... |
CUI filtering
Edit policy.d/filter, add a filter function 'cui_filter'. Simple example :
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|---|
# Filter the Chargeable-User-Identity attribute
cui_filter {
if (&reply:Chargeable-User-Identity =~ /REPLACE-WITH-CUI-TO-MATCH/) {
update request {
&Module-Failure-Message += "Rejected: CUI matching '%{reply:Chargeable-User-Identity}'"
}
reject
}
} |
Using policies and modules in your eduroam virtual server
Add 'cui' in authorize, post-auth and pre-proxy sections. Add 'cui_log' and 'cui_filter' in post-auth section :
| Code Block |
|---|
server eduroam {
...
authorize {
# only use filter_username from version > 3.0.7 on
filter_username
update request {
Operator-Name := "1yourdomain.tld"
# the literal number "1" above is an important prefix! Do not change it!
}
cui
# if you want detailed logging
auth_log
suffix
}
...
post-auth {
# if you want detailed logging
reply_log
cui
cui_filter
cui_log
Post-Auth-Type REJECT {
reply_log
eduroam_log
}
}
...
pre-proxy {
pre_proxy_log
cui
if("%{Packet-Type}" != "Accounting-Request") {
attr_filter.pre-proxy
}
}
...
} |
Caveats
Use the most recent version available (3.0.10 at the time of writing) because of known issues in older versions (ranging from filters that prevent people to get online with mixed usernames to TLS-related bugs).
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