hi folks,
using freeRADIUS 0.5 as a proxy to a cistron 1.6.6, I obtain a segmentation fault on
my freeradius when the replies contain tagged attributes
with tag specified (i.e. Tunnel-Assignment-Id:1="some_tunnel").
My confs are very simple:
cistron:
--------------------------------------------------------------------------users
foo.bar Auth-Type=Accept
Tunnel-Type:1 =L2TP,
Tunnel-Medium-Type:1 = IP,
Tunnel-Server-Endpoint:1 = "10.12.56.56",
Tunnel-Assignment-Id:1="foo_tunnel",
Tunnel-Password:1="foo",
Tunnel-Client-Auth-Id:1="foo_tunnel"
--------------------------------------------------------------------------users
freeradius:
-------------------------------------------------------------------------------------------------------radiusd.conf
##
## radiusd.conf -- FreeRADIUS server configuration file.
##
## http://www.freeradius.org/
## $Id: radiusd.conf.in,v 1.87 2002/03/14 18:47:06 aland Exp $
##
# The location of other config files and
# logfiles are declared in this file
#
# Also general configuration for modules can be done
# in this file, it is exported through the API to
# modules that ask for it.
#
# The configuration variables defined here are of the form ${foo}
# They are local to this file, and do not change from request to
# request.
#
# The per-request variables are of the form %{Attribute-Name}, and
# are taken from the values of the attribute in the incoming
# request. See 'doc/variables.txt' for more information.
# Stuff from autoconf
prefix = /usr/local
exec_prefix = ${prefix}
sysconfdir = ${prefix}/etc
localstatedir = ${prefix}/var
sbindir = ${exec_prefix}/sbin
logdir = ${localstatedir}/log/radius
raddbdir = ${sysconfdir}/raddb
radacctdir = ${logdir}/radacct
# Location of config and logfiles.
confdir = ${raddbdir}
run_dir = ${localstatedir}/run
#
# libdir: Where to find the rlm_* modules.
#
# This should be automatically set at configuration time.
#
# If the server builds and installs, but fails at execution time
# with an 'undefined symbol' error, then you can use the libdir
# directive to work around the problem.
#
# The cause is usually that a library has been installed on your
# system in a place where the dynamic linker CANNOT find it. When
# executing as root (or another user), your personal environment MAY
# be set up to allow the dynamic linker to find the library. When
# executing as a daemon, FreeRADIUS MAY NOT have the same
# personalized configuration.
#
# To work around the problem, find out which library contains that symbol,
# and add the directory containing that library to the end of 'libdir',
# with a colon separating the directory names. NO spaces are allowed.
#
# e.g. libdir = /usr/local/lib:/opt/package/lib
#
# If that does not work, then you can re-configure and re-build the
# server to NOT use shared libraries, via:
#
# ./configure --disable-shared
# make
# make install
#
libdir = ${exec_prefix}/lib
# pidfile: Where to place the PID of the RADIUS server.
#
# The server may be signalled while it's running by using this
# file.
#
# This file is written when ONLY running in daemon mode.
#
# e.g.: kill -HUP `cat /var/run/radiusd.pid`
#
pidfile = ${run_dir}/radiusd.pid
# user/group: The name (or #number) of the user/group to run radiusd as.
#
# We STRONGLY recommend that you run the server with as few permissions
# as possible. That is, if you're not using shadow passwords, the
# user and group items below should be set to 'nobody'.
#
# On SCO (ODT 3) use "user = nouser" and "group = nogroup".
#
# NOTE that some kernels refuse to setgid(group)
# when the value of (unsigned)group is above 60000;
# don't use group nobody on these systems!
#
# On systems with shadow passwords, you might have to set 'group = shadow'
# for the server to be able to read the shadow password file. If you can
# authenticate users while in debug mode, but not in normal use, it may be
# because the debugged server is running as a user that can read the shadow
# info, and the user listed below can not.
#
user = root
group = root
# max_request_time: The maximum time (in seconds) to handle a request.
#
# Requests which take more time than this to process may be killed, and
# a REJECT message is returned.
#
# WARNING: If you notice that requests take a long time to be handled,
# then this MAY INDICATE a bug in the server, in one of the modules
# used to handle a request, OR in your local configuration.
#
# Useful range of values: 5 to 120
#
max_request_time = 30
# delete_blocked_requests: If the request takes MORE THAN 'max_request_time'
# to be handled, then maybe the server should delete it.
#
# If you're running in threaded, or thread pool mode, this setting
# should probably be 'no'. Setting it to 'yes' when using a threaded
# server MAY cause the server to crash!
#
delete_blocked_requests = no
# cleanup_delay: The time to wait (in seconds) before cleaning up
# a reply which was sent to the NAS.
#
# The RADIUS request is normally cached internally for a short period
# of time, after the reply is sent to the NAS. The reply packet may be
# lost in the network, and the NAS will not see it. The NAS will then
# re-send the request, and the server will respond quickly with the
# cached reply.
#
# If this value is set too low, then duplicate requests from the NAS
# MAY NOT be detected, and will instead be handled as seperate requests.
#
# If this value is set too high, then the server will cache too many
# requests, and some new requests may get blocked. (See 'max_requests'.)
#
# Useful range of values: 2 to 10
#
cleanup_delay = 5
# max_requests: The maximum number of requests which the server keeps
# track of. This should be 256 multiplied by the number of clients.
# e.g. With 4 clients, this number should be 1024.
#
# If this number is too low, then when the server becomes busy,
# it will not respond to any new requests, until the 'cleanup_delay'
# time has passed, and it has removed the old requests.
#
# If this number is set too high, then the server will use a bit more
# memory for no real benefit.
#
# If you aren't sure what it should be set to, it's better to set it
# too high than too low. Setting it to 1000 per client is probably
# the highest it should be.
#
# Useful range of values: 256 to infinity
#
max_requests = 1024
# bind_address: Make the server listen on a particular IP address, and
# send replies out from that address. This directive is most useful
# for machines with multiple IP addresses on one interface.
#
# It can either contain "*", or an IP address, or a fully qualified
# Internet domain name. The default is "*"
#
bind_address = 127.0.0.1
# port: Allows you to bind FreeRADIUS to a specific port.
#
# The default port that most NAS boxes use is 1645, which is historical.
# RFC 2138 defines 1812 to be the new port. Many new servers and
# NAS boxes use 1812, which can create interoperability problems.
#
# The port is defined here to be 0 so that the server will pick up
# the machine's local configuration for the radius port, as defined
# in /etc/services.
#
# If you want to use the default RADIUS port as defined on your server,
# (usually through 'grep radius /etc/services') set this to 0 (zero).
#
# A port given on the command-line via '-p' over-rides this one.
#
port = 0
# Which program to execute check doing concurrency checks.
checkrad = ${sbindir}/checkrad
# hostname_lookups: Log the names of clients or just their IP addresses
# e.g., www.freeradius.org (on) or 206.47.27.232 (off).
# The default is 'off' because it'd be overall better for the net if people
# had to knowingly turn this feature on, since enabling it means that
# each client request will result in AT LEAST one lookup request to the
# nameserver.
#
# Turning hostname lookups off also means that the server won't block
# for 30 seconds, if it sees an IP address which has no name associated
# with it.
#
# allowed values: {no, yes}
#
hostname_lookups = no
# Core dumps are a bad thing. This should only be set to 'yes'
# if you're debugging a problem with the server.
#
# allowed values: {no, yes}
#
allow_core_dumps = yes
# Regular expressions
#
# These items are set at configure time. If they're set to "yes",
# then setting them to "no" turns off regular expression support.
#
# If they're set to "no" at configure time, then setting them to "yes"
# WILL NOT WORK. It will give you an error.
#
regular_expressions = yes
extended_expressions = yes
# Log the full User-Name attribute, as it was found in the request.
#
# allowed values: {no, yes}
#
log_stripped_names = no
# Log authentication requests to the log file.
#
# allowed values: {no, yes}
#
log_auth = yes
# Log passwords with the authentication requests.
# log_auth_badpass - logs password if it's rejected
# log_auth_goodpass - logs password if it's correct
#
# allowed values: {no, yes}
#
log_auth_badpass = yes
log_auth_goodpass = yes
# usercollide: Turn "username collision" code on and off. See the
# "doc/duplicate-users" file
#
usercollide = no
# lower_user / lower_pass:
# Lowercase the username/password "before" or "after"
# attempting to authenticate.
#
# If "before", the server will first modify the request
# and then try to auth the user. If "after", the server
# will first auth using the values provided by the
# user. If that fails it will reprocess the request
# after modifying it as you specify below.
#
# This is as close as we can get to case insensitivity. It is
# the admin's job to ensure that the username on the auth
# db side is *also* lowercase to make this work
#
# Default is 'no' (don't lowercase values)
# Valid values = "before" / "after" / "no"
#
lower_user = no
lower_pass = no
# nospace_user / nospace_pass:
# Some users like to enter spaces in their username or
# password incorrectly. To save yourself the tech support
# call, you can eliminate those spaces here:
#
# Default is 'no' (don't remove spaces)
# Valid values = "before" / "after" / "no" (explanation above)
#
nospace_user = no
nospace_pass = no
# SECURITY CONFIGURATION
#
# There may be multiple methods of attacking on the server. This
# section holds the configuration items which minimize the impact
# of those attacks
#
security {
#
# max_attributes: The maximum number of attributes
# permitted in a RADIUS packet. Packets which have MORE
# than this number of attributes in them will be dropped.
#
# If this number is set too low, then no radius packets
# will be accepted.
#
# If this number is set too high, then an attacker may be
# able to send a small number of packets which will cause
# the RADIUS server to use all available memory.
#
# Setting this number to 0 means "allow any number of attributes"
max_attributes = 200
#
# delayed_reject: When sending an Access-Reject, it can be
# delayed for a few seconds. This may help slow down a DoS
# attack. It also helps to slow down people trying to brute-force
# crack a users password.
#
# Setting this number to 0 means "send rejects immediately"
#
# If this number is set higher than "cleanup_delay", then the
# rejects will be sent after 'cleanup_delay".
#
# Useful ranges: 1 to 5
reject_delay = 0
}
# PROXY CONFIGURATION
#
# proxy_requests: Turns proxying of RADIUS requests on or off.
#
# The server has proxying turned on by default. If your system is NOT
# set up to proxy requests to another server, then you can turn proxying
# off here. This will save a small amount of resources on the server.
#
# If you have proxying turned off, and your configuration files say
# to proxy a request, then an error message will be logged.
#
# To disable proxying, change the "yes" to "no", and comment the
# $INCLUDE line.
#
# allowed values: {no, yes}
#
proxy_requests = yes
$INCLUDE ${confdir}/proxy.conf
# CLIENTS CONFIGURATION
#
# Client configuration is defined in "clients.conf". If you don't
# use the "clients.conf", you can comment the following. The use of
# "clients.conf" is recommended over the old "clients", though both
# are supported.
#
$INCLUDE ${confdir}/clients.conf
# SNMP CONFIGURATION
#
# Snmp configuration is only valid if you enabled SNMP support when
# you compiled radiusd.
#
#$INCLUDE ${confdir}/snmp.conf
# THREAD POOL CONFIGURATION
#
# The thread pool is a long-lived group of threads which
# take turns (round-robin) handling any incoming requests.
#
#
# You probably want to have a few spare threads around,
# so that high-load situations can be handled immediately. If you
# don't have any spare threads, then the request handling will
# be delayed while a new thread is created, and added to the pool.
#
# You probably don't want too many spare threads around,
# otherwise they'll be sitting there taking up resources, and
# not doing anything productive.
#
# The numbers given below should be adequate for most situations.
#
thread pool {
# Number of servers to start initially --- should be a reasonable
# ballpark figure.
start_servers = 5
# Limit on the total number of servers running.
#
# If this limit is ever reached, clients will be LOCKED OUT, so it
# should NOT BE SET TOO LOW. It is intended mainly as a brake to
# keep a runaway server from taking the system with it as it spirals
# down...
#
max_servers = 32
# Server-pool size regulation. Rather than making you guess
# how many servers you need, FreeRADIUS dynamically adapts to
# the load it sees, that is, it tries to maintain enough
# servers to handle the current load, plus a few spare
# servers to handle transient load spikes.
#
# It does this by periodically checking how many servers are
# waiting for a request. If there are fewer than
# min_spare_servers, it creates a new spare. If there are
# more than max_spare_servers, some of the spares die off.
# The default values are probably OK for most sites.
#
min_spare_servers = 3
max_spare_servers = 10
# There may be memory leaks or resource allocation problems with
# the server. If so, set this value to 300 or so, so that the
# resources will be cleaned up periodically.
#
# This should only be necessary if there are serious bugs in the
# server which have not yet been fixed.
#
# '0' is a special value meaning 'infinity', or 'the servers never
# exit'
max_requests_per_server = 0
}
modules {
files {
usersfile = ${confdir}/users
acctusersfile = ${confdir}/acct_users
# If you want to use the old Cistron 'users' file
# with FreeRADIUS, you should change the next line
# to 'compat = cistron'. You can the copy your 'users'
# file from Cistron.
compat = no
}
}
# Authorization. First preprocess (hints and huntgroups files),
# then realms, and finally look in the "users" file.
# The order of the realm modules will determine the order that
# we try to find a matching realm.
# Make *sure* that 'preprocess' comes before any realm if you
# need to setup hints for the remote radius server
authorize {
files
}
-------------------------------------------------------------------------------------------------------radiusd.conf
-------------------------------------------------------------------------------------------------------users
#
# For a list of RADIUS attributes, and links to their definitions,
# see:
#
# http://www.freeradius.org/rfc/attributes.html
#
DEFAULT Proxy-To-Realm := "cistron"
-----------------------------------------------------------------------------------------------------users
----------------------------------------------------------------------------------------------------proxy.conf
proxy server {
synchronous = yes
retry_delay = 5
retry_count = 3
dead_time = 120
default_fallback = yes
}
#
# This realm is for ALL OTHER requests.
#
realm DEFAULT {
type = radius
authhost = localhost:1645
accthost = localhost:1646
secret = babele
strip
}
----------------------------------------------------------------------------------------------------proxy.conf
I use radclient to send a request with User-Name=foo.bar to the freeradius.
running the freeradius with -AX i see:
rad_recv: Access-Request packet from host 127.0.0.1:32769, id=71, length=30
User-Name = "foo.bar"
modcall: entering group authorize
users: Matched DEFAULT at 54
modcall[authorize]: module "files" returns ok
modcall: group authorize returns ok
Sending Access-Request of id 1 to 127.0.0.1:1645
User-Name = "foo.bar"
Proxy-State = "71"
--- Walking the entire request list ---
Waking up in 5 seconds...
rad_recv: Access-Accept packet from host 127.0.0.1:1645, id=1, length=103
Tunnel-Type:1 = L2TP
Tunnel-Medium-Type:1 = IP
Tunnel-Server-Endpoint:1 = "10.12.56.56"
Segmentation fault
on the cistron, seems all ok:
radrecv: Packet from host 127.0.0.1 code=1, id=1, length=34
User-Name = "foo.bar"
Proxy-State = "71"
users: Matched foo.bar at line 39
Sending Ack of id 1 to 127.0.0.1
Tunnel-Type:1 = L2TP
Tunnel-Medium-Type:1 = IP
Tunnel-Server-Endpoint:1 = "10.12.56.56"
Tunnel-Assignment-Id:1 = "foo_tunnel"
Tunnel-Password:1 = "foo"
Tunnel-Client-Auth-Id:1 = "foo_tunnel"
Proxy-State = "71"
Login OK: [foo.bar/] (from nas local/S0)
hope this help!
max
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