Hi,
Developing a module for FreeRADIUS to support EAP-SIM and EAP-AKA authentication against a HLR.
The HLR we were targeting only supported a SCTP/M3UA/SCCP/TCAP/MAP stack, so we couldn't use SUA.
Ripping the M3UA/MTP3 code out of OpenBSC worked surprisingly well. We ended up running the event loop in a separate thread to work around the threading issues.
Unfortunately the HLR implements the ANSI variant of everything, whereas OpenBSC and supporting libraries seem to have been written to be compatible with the ITU standards.
...but the differences are fairly minor at MTP3 and SCCP layers, and i've started work on a patchset for libosmo-sccp.
https://gerrit.osmocom.org/#/c/73/
Anyway, trying to gauge interest in splitting those layers out of Open BSC into a separate library, would be happy to take on M2UA as well for consistency.
It would almost certainly get more projects using the code. There's very little out there even in Perl land for working with SS7.
Thanks, -Arran
Arran Cudbard-Bell a.cudbardb@freeradius.org FreeRADIUS Development Team
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On 24 May 2016, at 00:23, Arran Cudbard-Bell a.cudbardb@freeradius.org wrote:
Hi,
Hi!
Developing a module for FreeRADIUS to support EAP-SIM and EAP-AKA authentication against a HLR.
cool! I hope it is going to be Free Software?
The HLR we were targeting only supported a SCTP/M3UA/SCCP/TCAP/MAP stack, so we couldn't use SUA.
Ripping the M3UA/MTP3 code out of OpenBSC worked surprisingly well. We ended up running the event loop in a separate thread to work around the threading issues.
Unfortunately the HLR implements the ANSI variant of everything, whereas OpenBSC and supporting libraries seem to have been written to be compatible with the ITU standards.
If you need another HLR (either IPA + SCCP or through osmo-stp as M3UA ASP) to test against I can help you to set-up the Smalltalk HLR/AuC I wrote.
holger
On May 26, 2016, at 9:01 AM, Holger Freyther holger@freyther.de wrote:
On 24 May 2016, at 00:23, Arran Cudbard-Bell a.cudbardb@freeradius.org wrote:
Hi,
Hi!
Developing a module for FreeRADIUS to support EAP-SIM and EAP-AKA authentication against a HLR.
cool! I hope it is going to be Free Software?
I am encouraging it to be Free Software.
If it'd generate more enthusiasm for maintaining the M3UA/M2UA/MTP3 code outside of OpenBSC that might help my argument some :)
If you need another HLR (either IPA + SCCP or through osmo-stp as M3UA ASP) to test against I can help you to set-up the Smalltalk HLR/AuC I wrote.
Cool! Yes that might be useful.
I also added support for Route Registration at the M3UA level, but have nothing to test against as their SG doesn't support it.
Is there anything I can test against in *osmo*?
Thanks, -Arran
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It’s fascinating to see the technical challenges you encountered while developing that module for FreeRADIUS! It’s always a tricky balance when dealing with different standards like ANSI and ITU. Speaking of overcoming challenges, have you tried playing Retro Bowl? It's a perfect way to unwind after a coding session! You can check it out at Retro Bowl for some fun football action. Keep up the great work with the HLR integration! https://retrobowlfree.com
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I remember once I had to interface with a telecom component limited to obscure protocol stacks—getting the right threading and stack compatibility took weeks. Facing ANSI versus ITU quirks, I also ended up patching open source code, though never as deep as extracting MTP3 or SCCP layers. Your dedication resonates with my old project headaches! https://slicemasterfree.com
I remember when I faced a similar challenge with a different protocol stack, and the Level Devil of mismatched implementations haunted my progress. I had to rewrite significant portions of the codebase just to maintain functionality. https://leveldevilfull.com
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