September 2005 - Freeradius-Users - lists.freeradius.org

RE: choosing userprofile by NAS
by Jonathan De Graeve 22 Sep '05

22 Sep '05

I'm looking for the same thing but then with an SQL backend instead of LDAP J. -- Jonathan De Graeve Network/System Administrator Imelda vzw Informatica Dienst 015/50.52.98 jonathan.de.graeve(a)imelda.be --------- Always read the manual for the correct way to do things because the number of incorrect ways to do things is almost infinite --------- -----Oorspronkelijk bericht----- Van: freeradius-users-bounces(a)lists.freeradius.org [mailto:freeradius-users-bounces@lists.freeradius.org] Namens Florian Prester Verzonden: donderdag 22 september 2005 10:33 Aan: FreeRadius users mailing list Onderwerp: choosing userprofile by NAS Hi, how can I serve different information to the same user depending on the Huntgroup having all information stored in a LDAP-server? meaning: userA logging in NAS_A: receives IP-A supplied by LDAP userA logging in NAS_B: receives IP-B supplied by LDAP -- ---------------------------------------------------------- Dipl. Inf. Florian Prester Network Administration Regionales RechenZentrum Erlangen Universitaet Erlangen-Nuernberg Germany Tel.: +499131 8527813 - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html

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Realm extraction
by Dmitry Alekhin 22 Sep '05

22 Sep '05

Hi all, I am new in free radius , so I have one question: How can I exctract Realm attribute in radiusd.conf name? So, I need to use it in LDAP filter to make search like : ldap { server = "localhost" identity = "uid=pr,ou=Staff,dc=domain,dc=com" password = secret basedn = "ou=People,dc=ivoho,dc=com" filter = "(uid=%{User-Name},ou=%{Realm-Name})" # base_filter = "(objectclass=radiusprofile)" ... how can I get Realm-Name variable ?

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Using NAS-Port-Type to allow or disallow?
by Martin.Ward＠uk.neceur.com 22 Sep '05

22 Sep '05

Hi all, I have succumbed and purchased the RADIUS book from O'Reilly, but it'll be a few days in coming so I going to have to bug you all again. I'm still having problems understanding if I can allow some users access to some equipment and others to other kit. I thought I could do it but I'm having real problems, probably with my lack of understanding... I have a wireless LAN switch which has access points ( APs ) connected to it. When a laptop first connects to an AP that AP sends a RADIUS request through the WLAN switch to the RADIUS server, passing the MAC address of the laptop as the User-Name and also as the User-Password. I have a simple flat file with all the allowed MAC addresses in it, and the passwd module is being used to verify that the MAC address is in that flat file. This works well. Now because the WLAN switch is configured to use RADIUS to authenticate laptops, it also uses it to authenticate logins to the switch itself, I haven't found a way around this and don't think there is one. This means that you can gain access to the WLAN switch by using the MAC address of your laptop as the user name and password, albeit with fairly high restrictions on what you can do. This is a security problem for two reasons: 1. Obviously anyone figuring this out can gain access to kit they should not have access to (there are other ways of stopping this, but you'll excuse me if I don't mention them here). 2. The proper administrators, and the default administration login itself, have to be put in to the flat file I mentioned above to allow the administrators access to the switch. The switch won't use its own internal user and password list. This causes another security breach as we would have to leave administrator logins and passwords lying around in flat files, which is extremely insecure and just begging to be broken. I have been trying to get administrator access to authenticate via the Unix module since the RADIUS server is on a Linux box. Alas I have been unable to get this to work. Investigation reveals that when the AP passes the RADIUS request in, the request sets 'NAS-Port-Type = Wireless-802.11' and the NAS-Port-ID to the correct port value, while when the switch requests a login to be authenticated the request contains 'NAS-Port-Type = Virtual', and doesn't have the NAS-Port-ID or NAS-Indentifier parameters set. So, it seems I have lots of information to help me define if a RADIUS request is coming from an access point (which requires MAC address validation) or from the switch (which requires login username and password validation), but I can't find a way of verifying via passwd OR Unix module, only via both. Is what I am after possible, or do I just not understand the way RADIUS servers work? |\/|artin -- Senior Network Administrator, NEC (Europe) Ltd. Acton extension: 3379 NEC*Net: 800-44-21-3379 Direct: +44 20 8752 3379 Fax: +44 20 8752 3389 Mobile: +44 7721 869 356

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Re: Transmitted packet
by Iandc Davies 22 Sep '05

22 Sep '05

> "Iandc Davies" <Iandc.Davies(a)Marconi.com> wrote: > The contents of the transmitted packet include an uint8_t *data. > > What exactly is this pointing to ? >> The transmitted packet. >> Your terminology is confused: Aaahhh, I think it is. OK. >> - RADIUS_PACKET = internal FreeRADIUS data structure holdin uint8_t *data >> - uint8_t *data = actual RADIUS packet sent via "sendto" >> Alan DeKok. So, if I was to sent a packet to the radius server what format would it be ? I was running under the understanding that I needed to populate the contents of the RADIUS_PACKET structure, therefore :- int sockfd - uint32_t src_ipaddr - uint32_t dst_ipaddr - u_short src_port - u_short dst_port - int id - to be populated by me unsigned int code - to be populated by me uint8_t vector[16] - to be populated by me time_t timestamp - int verified - uint8_t *data - int data_len - to be populated by me VALUE_PAIR *vps - to be populated by me Apart from the above is there anything else that needs filling in ? .... or am I completely wrong again ? Ian Davies {02476 564662} Internal (x740 4662) IMS-SIPAC Software Development Engineer

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proxy EAP/PAP ?
by Tim Winders 22 Sep '05

22 Sep '05

Hello All - As I can't seem to get freeradius working on my Tru64 box and my box seems to be "broken" I thought I'd try to install freeradius on a RHEL box and use the fr proxy feature to proxy back to my Tru64 box running the Livinginston Radius server. My question, I want to be able to authenticate against the Tru64 passwd user database from a Windows client connected to a wireless AP running WPA. When I had a working fr on the Tru64 box, I was able to use the SecureW2 supplicant on XP with EAP/PAP to authenticate against passwd and it worked great. So, now, if I am running a non-EAP aware radius on the Tru64, and freeradius on a Linux box proxying to the Tru64 box, will I be able to do EAP/PAP authentication? I'm ready the proxy doc, but, I don't see anything about that, or if it's even applicable. --- Tim Winders Associate Dean of Information Technology South Plains College Levelland, TX 79336 Problem replying to my email? Click the "Sign" button in the OE toolbar or, better yet, get your own FREE Personal E-Mail Digital ID: http://www.thawte.com/email/index.html

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Serializing database requests
by Mike Chamberlain 22 Sep '05

22 Sep '05

Hi there. We are using FreeRadius on a VoIP network, talking to a database holding account information. Consider the following sequence of SQL statements generated by FreeRadius, which in some cases are producing a problem for us: AUTHENTICATE EXEC Rad_Authenticate '1211170776', '0889810576', '', '34333239 66326330 65380031 34383800', 'h323-ivr-out=ACCESSCODE:4441', '', '211.26.139.42', '' AUTHORIZE EXEC Rad_Authenticate '1211170776', '0889810576', '00113162558045', '34333239 66326330 65380031 34383800', 'h323-ivr-out=ACCESSCODE:4441;h323-ivr-out=FOLLOW_ON_FLAG:0', '', '211.26.139.42', '' STOP ACCOUTNING EXEC Rad_Stop_Accounting '1211170776', '34333239 66326330 65380031 34383800', '34333239 66326330 65380031 34383800', 'answer', '0889810576', '4441', '10', '51', '211.26.139.42', 'au-syd-primus1' We are currently not using start accounting messages. In the above case, the authorize messages and stop accounting messages are generated almost simultaneously because the user has hung up immediately after dialling the number. But the authorize procedure takes longer to process than the stop accounting procedure, meaning that the stop procedure completes before the authorize. This means that in effect the two messages get processed back to front. In our scenario this leaves a call open in the database that will never be closed. How do other people cope with this? Is there some way of forcing FreeRadius to serialize requests from the same username so it won't issue a new one until it has received a response for an existing one? Thanks in advance for any help, Mike

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Implementation advice needed.
by Daniel Corbe 22 Sep '05

22 Sep '05

Hello, I'm looking for a couple of suggestions as how to implement some specifics. I've set up a FreeRADIUS server to do AAA primarily in a SIP enviornment. I've got a B2BUA which attempts to authorize outgoing calls. I want to use this to do Least Cost Routing. Upon an INVITE packet, the B2BUA sends the following attributes User-Name = "1234" User-Password = "." NAS-IP-Address = 10.10.17.5 NAS-Port = 1000 Called-Station-Id = "5551212" Calling-Station-Id = "1234" This is enough information for me to authorize the phone call. Here are my questions 1) I have tariff tables stored in a back-end database. What would be the best way to go about looking up this information? Is there some way to execute a custom SQL lookup to pull this information back? Or should I be calling exec to say a custom script? 2) If exec is the best way to go about doing this, am I correct in reading the documentation that my script should be returning 0 (Access-Accept) or 1 (Access-Reject)? 3) I can customize my B2BUA so it accepts an IP address to forward a SIP request along. Is there a way either from exec or another method to add Radius attributes to the reply packet? That way I can do true LCR and tell the B2BUA which Gateway to forward the request. Thanks. -Daniel

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WPA with freeradius
by poczta＠flashnet.pl 22 Sep '05

22 Sep '05

Hello i want to configure freeradius with hardware adsl router ... could you sugest me some? i've got linksys wag54g which doesnt support pure radius but WPA radius.. is it posible to make them work together with my freeradius server? any hints, links (!), anything... i've searchd faqs and lists but i haven't found anything special (or i didn't search enough) thanks wasyl

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Transmitted data to radius server.
by Iandc Davies 22 Sep '05

22 Sep '05

Firstly, thanks to all of you with being this patient with me. I think I've got a handle on the method. Please correct me if I'm wrong in either terminology or content. For the purpose of this mail, please use the following meanings: Server = RADIUS Server Client = "The thing that sends information to the server." OK, To construct a message that is received by the sever from the client, I can create a structure of the following type: typedef struct radius_packet{ int id, unsigned int code, uint8_t vector[16], VALUE_PAIR *vps; }RADIUS_PACKET The VALUE_PAIR struct is as defined currently. The radius server will receive the transmitted packet by passing a file descriptor and a data array to a system function call recvfromto. Data then holds the received data in the following uint8_t format. data[0] - code data[1] - identifier data[2] - length (HSB) data[3] - length (LSB) data[4] - vector[0] (16 octect authenticator) data[5] ...... data[19] - vector[15] data[20] - start of value_pair sequence. ....... If that is correct so far, radius than re-alignes to evaluate the value_pairs. This is where, again my understanding of the code is a bit hazy. Any help appreciated. :-) Therefore data[20] is mapped to a pointer attr. attr[0] - holds vp->attribute attr[1] - holds vp->length The server sanity checks the sum of the lengths of the attributes against the data length of the mesage. Once this happens, the servers mem copies the data array to RADIUS_PACKET -> data and treats it as it will. Many thanks and a promise to buy you a drink or three if I see you ;-) Ian Davies {02476 564662} Internal (x740 4662) IMS-SIPAC Software Development Engineer

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RE: cannot return access accept from proxy to client
by Wilson Lie 22 Sep '05

22 Sep '05

Hi , Thanks for your help. I'm not sure that I can tell the case clear enough. But I'm afraid that you misunderstood the question. Kindly help me again or correct me if I'm really wrong. >> No. FreeRADIUS doesn't care about User-Name's in Access-Accept. Yes, for normal Access-Accept if Host B act as server , the access-accept can be sent back to client But when access-accept is sent from host A -> Host B , from host B debug log, it can be seen that as user-name is missing, the [sql] module cannot be run , freeradius return failed in [sql] where [sql] refers to post-auth query in this case and the statement contains "User-name" attribute (e.g. update xxx set xxx where username=attribute ) So I would like to ask if any special handling by freeradius in this case ? As the post-auth [sql] section is configured in sql.conf and it should be same because only one post-auth query can be configured. Or "user-name" attribute can never be included in the post-auth query in this case ? ( i.e. Host B acts as both proxy and auth-server) Many thanks! ==================== Processing the post-auth section of radiusd.conf modcall: entering group post-auth for request 3 radius_xlat: '/usr/local/var/log/radius/radacct/xxx.xxx.xxx.xxx/reply-detail-20050921' rlm_detail: /usr/local/var/log/radius/radacct/%{Client-IP-Address}/reply-detail-%Y%m%d expands to /usr/local/var/log/radius/radacct/xxx.xxx.xxx.xxx/reply-detail-20050921 modcall[post-auth]: module "reply_log" returns ok for request 3 rlm_sql (sql): Processing sql_postauth radius_xlat: '' modcall[post-auth]: module "sql" returns fail for request 3 modcall: group post-auth returns fail for request 3 Delaying request 3 for 1 seconds Finished request 3 ===================== -----Original Message----- From: Alan DeKok [mailto:aland@ox.org] Sent: 2005/9/22 [星期四] 下午 11:19 To: FreeRadius users mailing list Cc: Subject: Re: cannot return access accept from proxy to client "Wilson Lie" <wilson.lie(a)ithlgroup.com> wrote: > I suspect that the freeradius will return failed at once when > "username" attribute is not found and because the username attribute > won't be included in the "access-accept' packet . No. FreeRADIUS doesn't care about User-Name's in Access-Accept. > The "sql" can be executed successfully when host B acts as > authentication server.=20 Look at the differences between the two queries. They ARE different. > So maybe I should ask can freeradius be configured as both > authentication server and proxy server at the same host ? Yes. Many, many people have configured this successfully. If your site doesn't work, it's because something is going wrong in your local config, and debug mode will tell you. Alan DeKok. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html ____________________________________________________________ (c) 2005 Interactive Technology Holdings Limited Group. All rights reserved. CONFIDENTIALITY: This communication and any attachment(s) is intended solely for the person or organisation to which it is addressed and it may be confidential. This communication may contain confidential or legally privileged material and may not be copied, redistributed or published (in whole or in part) without our prior written consent. This communication may have been intercepted, partially destroyed, arrive late, incomplete or contain viruses and no liability is accepted by any member of the Interactive Technology Holdings Limited Group as a result. If you are not the intended recipient, employee or agent responsible for delivering the message to the intended recipient you must not copy, disclose, distribute or take any action in reliance on it. If you have received this communication in error, please immediately reply and highlight the error to the sender immediately and destroy the original from your computer.

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