RadSecProxy
From Lolly's Wiki
RadSecProxy
Build
Patch for radsecproxy-1.6.8 on Ubuntu 16.04
In radsecproxy 1.6.9 and source from git on [git.nordu.net] this patch is not needed since [18.1.2017].
$ git clone https://git.nordu.net/radsecproxy.git
diff -rub radsecproxy-1.6.8/tcp.c radsecproxy-1.6.8_Ubuntu_16.04/tcp.c
--- radsecproxy-1.6.8/tcp.c 2016-09-21 13:49:09.000000000 +0200
+++ radsecproxy-1.6.8_Ubuntu_16.04/tcp.c 2017-07-13 16:35:52.414151832 +0200
@@ -353,7 +353,7 @@
struct sockaddr_storage from;
socklen_t fromlen = sizeof(from);
- listen(*sp, 0);
+ listen(*sp, 16);
for (;;) {
s = accept(*sp, (struct sockaddr *)&from, &fromlen);
diff -rub radsecproxy-1.6.8/tls.c radsecproxy-1.6.8_Ubuntu_16.04/tls.c
--- radsecproxy-1.6.8/tls.c 2016-09-21 13:49:09.000000000 +0200
+++ radsecproxy-1.6.8_Ubuntu_16.04/tls.c 2017-07-13 16:36:22.678166655 +0200
@@ -467,7 +467,7 @@
struct sockaddr_storage from;
socklen_t fromlen = sizeof(from);
- listen(*sp, 0);
+ listen(*sp, 16);
for (;;) {
s = accept(*sp, (struct sockaddr *)&from, &fromlen);
Configure
$ ./configure --prefix=/opt/radsecproxy-1.6.8 --sysconfdir=/etc/radsec --with-ssl --enable-fticks
$ make clean all && sudo make install
Another example: Version 1.7.2 from git
$ mkdir radsecproxy && cd radsecproxy
$ git clone --single-branch --branch 1.7.2 https://github.com/radsecproxy/radsecproxy tags/1.7.2
$ cd tags/1.7.2
$ ./autogen.sh
$ ./configure --prefix=/opt/radsecproxy-${PWD##*/} --sysconfdir=/etc/radsec --with-ssl
$ make clean all && sudo make install
Config
/etc/radsec/radsecproxy.conf
# Master config file for radsecproxy
IPv4Only on
listenUDP <IP>:1812
listenUDP <IP>:1813
listenTLS <IP>:2083
LogLevel 5 # For testing later reduce to 3
#LogDestination file:///var/log/radsecproxy.log
LogDestination x-syslog:///LOG_DAEMON
LogThreadId on
LoopPrevention on
######## TLS section
tls default {
CACertificatePath /etc/radsec/cert/ca
CertificateFile /etc/radsec/cert/radsecproxy-cert.pem
CertificateKeyFile /etc/radsec/cert/radsecproxy-key.pem
CertificateKeyPassword <PASSWORD>
TlsVersion TLS1_2
CipherList TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:AES256-GCM-SHA384
}
Include /etc/radsec/rewrites.conf
Include /etc/radsec/clients.conf
Include /etc/radsec/servers.conf
Include /etc/radsec/realms.conf
ca certificate in /etc/radsec/cert/ca
For DFN users it is the TeleSec root certificate
The destination file name is <hash of the certificate>.0
# openssl x509 -noout -hash -in /tmp/telesec.pem
1e09d511
# mv /tmp/telesec.pem /etc/radsec/cert/ca/1e09d511.0
/etc/radsec/cert/ca/1e09d511.0
subject= /C=DE/O=T-Systems Enterprise Services GmbH/OU=T-Systems Trust Center/CN=T-TeleSec GlobalRoot Class 2
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
/etc/radsec/rewrites.conf
## Empty for our setup
/etc/radsec/clients.conf
This matches our german top level radius (tlr) you have to customize it for other countries.
#
## DFN
#
client tlr1 {
host 193.174.75.134
type tls
certificatenamecheck off
matchCertificateAttribute CN:/^(radius1\.dfn|tld1\.eduroam)\.de$/
}
client tlr2 {
host 193.174.75.138
type tls
certificatenamecheck off
matchCertificateAttribute CN:/^(radius2\.dfn|tld2\.eduroam)\.de$/
}
# Our WLAN Controller
client wlc {
host 10.1.1.0/24
type udp
secret ****secret****
}
#client anyIP4TLS {
# host 0.0.0.0/0
# type TLS
#}
/etc/radsec/servers.conf
#
## UDP Radius
#
#Server Our-EduroamRadiusAuth {
# host <internal radius server>
# port 1812
# type udp
# secret ****secret****
#}
#Server Our-EduroamRadiusAcct {
# host <internal radius accounting server>
# port 1813
# type udp
# secret ****secret****
#}
#
## TLS Radius / RadSec
#
server freeradius-1 {
host <internal radius accounting server1>
type tls
certificatenamecheck off
matchCertificateAttribute CN:/^freeradius1\.domain\.tld$/
StatusServer on
secret ****secret****
}
server freeradius-2 {
host <internal radius accounting server2>
type tls
certificatenamecheck off
matchCertificateAttribute CN:/^freeradius2\.domain\.tld$/
StatusServer on
secret ****secret****
}
server tlr1 {
host 193.174.75.134
type tls
certificatenamecheck off
matchCertificateAttribute CN:/^(radius1\.dfn|tld1\.eduroam)\.de$/
StatusServer on
}
server tlr2 {
host 193.174.75.138
type tls
certificatenamecheck off
matchCertificateAttribute CN:/^(radius2\.dfn|tld2\.eduroam)\.de$/
StatusServer on
}
/etc/radsec/realms.conf
# Our domain domain.tld
realm /(eduroam|anonymous)@domain\.tld$/ {
server freeradius-1
server freeradius-2
accountingServer freeradius-1
accountingServer freeradius-2
}
# If the anonymous user has not been matched above, fail
# So users that use their real identity fail, too. Force anonymous!
realm /@domain\.tld$ {
replymessage "Access rejected, wrong anonymous identity. Use eduroam@domain.tld as anonymous identity."
accountingresponse on
}
# Other domain of our site not used for eduroam
realm /@wrong-domain\.tld$/ {
replymessage "Misconfigured client: Use domain.tld as domain instead."
accountingresponse on
}
# Default realm of some clients. Do not send to top level radius servers.
realm /@.*\.3gppnetwork\.org$/ {
replymessage "Misconfigured client."
accountingresponse on
}
# Default realm of some clients. Do not send to top level radius servers.
realm /myabc\.com$/ {
replymessage "Misconfigured client: default realm of Intel PRO/Wireless supplicant! Rejected by us."
accountingresponse on
}
# Empty realm. Do not send to top level radius servers.
realm /^$/ {
replymessage "Misconfigured client: empty realm! Rejected by us."
accountingresponse on
}
# Typo in realm. Realm without any dot in it. Do not send to top level radius servers.
realm /@[^\.]+$/ {
replymessage "Misconfigured client: Typo in realm - No dot in realm ! Rejected by us."
accountingresponse on
}
# Typo in realm. Realm without double dot in it. Do not send to top level radius servers.
realm /@.*\.\..*$/ {
replymessage "Misconfigured client: Typo in realm - .. ! Rejected by us."
accountingresponse on
}
# Typo in realm. Realm without space in it. Do not send to top level radius servers.
realm /@.*\s+.*$/ {
replymessage "Misconfigured client: Typo in realm - Don't use spaces in your realm! Rejected by us."
accountingresponse on
}
# All other realms -> Eduroam toplevel servers
realm * {
server tlr1
server tlr2
accountingserver tlr1
accountingserver tlr2
}
/etc/radsec/cert/radsecproxy.pem
subject=/CN=radsecproxy.domain.tld/OU=bla/O=bli/L=Hamburg/ST=Hamburg/C=DE
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
And now the whole cerstificate chain...
Run the daemon
Security
There is no need to run radsecproxy as root. But you need write access to the log or use syslog.
The config, certificate and key is not readable by the user (nogroup) but by the group radsecproxy where the porocess lives in (see systemd unit file radsecproxy.service).
User
# addgroup -g 2083 radsecproxy
# useradd -u 2083 -g nogroup -s /bin/false -h /nonexistent
Permissions
# chown -R root:radsecproxy /etc/radsec
# find /etc/radsec -type d -exec chmod 0750 {} \;
# find /etc/radsec -type f -exec chmod 0640 {} \;
systemd unit file
# systemctl cat radsecproxy.service
[Unit]
Description=radsecproxy
ConditionPathExists=/etc/radsec/radsecproxy.conf
After=network.target
Documentation=man:radsecproxy(1)
[Service]
Type=forking
User=radsecproxy
Group=radsecproxy
RuntimeDirectory=radsecproxy
RuntimeDirectoryMode=0700
PrivateTmp=yes
InaccessibleDirectories=/var
ReadOnlyDirectories=/etc
ReadOnlyDirectories=/lib
ReadOnlyDirectories=/usr
ExecStart=/opt/radsecproxy/sbin/radsecproxy -i /run/radsecproxy/radsecproxy.pid
PIDFile=/run/radsecproxy/radsecproxy.pid
[Install]
WantedBy=multi-user.target
Put this to /lib/systemd/system/radsecproxy.service and do:
# systemctl daemon-reload # systemctl enable radsecproxy.service # systemctl start radsecproxy.service
Testing
Check on the server if the radsecproxy is listening:
# lsof -Pni TCP:2083 -s TCP:Listen
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
radsecpro 1344 radsecproxy 9u IPv4 22751 0t0 TCP <server ip>:2083 (LISTEN)
Certificate Enddate
$ openssl s_client -connect <IP>:2083 -tls1 -no_ssl2 -no_ssl3 -showcerts 2>/dev/null | openssl x509 -enddate -noout
notAfter=Oct 9 12:13:17 2020 GMT
For this to work it is necessary, that you have configured a client that matches the host where you ask from:
client openssl_check_radsec {
host a.b.c.d
type tls
secret dummy_for_openssl
}
if not you will see something like this in the radsecproxy log:
Jan 12 14:53:48 radsecproxy-1 radsecproxy[1359]: (305626) tlsservernew: ignoring request, no matching TLS client for a.b.c.d
and your openssl just will show:
$ openssl s_client -showcerts -connect a.b.c.d:2083
CONNECTED(00000003)
write:errno=0
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 0 bytes and written 283 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
Problems & Solutions
freeradius: systemd[1]: freeradius.service: Main process exited, code=killed, status=11/SEGV
If you see something like this at you connected freeradius servers, check if you got the file from a windows user and see if it is in DOS format like this (use vi not less):
-----BEGIN CERTIFICATE----- MIIHszCCBZugAwIBAgIMKX2RveVddPE7s2KGMA0GCSqGSIb3DQEBCwUAMHYxCzAJ^M BgNVBAYTAkRFMUUwQwYDVQQKDDxWZXJlaW4genVyIEZvZXJkZXJ1bmcgZWluZXMg^M RGV1dHNjaGVuIEZvcnNjaHVuZ3NuZXR6ZXMgZS4gVi4xIDAeBgNVBAMMF2VkdXJv^M ...
You can use unix2dos to convert it to unix format. Yes... that the radsecproxy does not convert it is ugly... but that's life.
