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TPU-Data User Wireshark SMS


bass
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Hi,

I just try to capture GSMTAP packets from my OpenBTS. unfortunately I could not get SMS content as plain text. anybody know how to figure out this problem?

some sources said with standart wireshark they could get content sms in plain text. I had tried to copy its hex stream and decode with 7bit encoder which was provided online, but the result was same, I got nothing.

Many Thanks,
Bass

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I was under the impression that GSM typically used some level of encryption for its transports. Did you deactivate/not configure this for your OpenBTS 'tower'?

Maybe something for a separate thread, but could you describe your setup? What you're doing here sounds really fascinating.

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Unless you can force it to lower bands, 3g and above generally I believe are encrypted. 2g and lower bands I believe can be read more easily though. Google Georgia Weidman for some of her videos on capturing phone traffic.

https://secupwn.github.io/Android-IMSI-Catcher-Detector/

Edited by digip
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hi cooper,

I used default configuration on my openBTS. only changing the GSMTAP config with "1" to enable wireshark for capturing the openbts packets.

here is its pcap file :
https://drive.google.com/open?id=0B2PfFt7P5kAgcjJaQUNBeVFuMGM&authuser=0



hi digip,
what I know is openbts run on 2G not 3G. then, open encryption also optional, in this case my configuration is "GSM.Cipher.Encrypt 0" (default, without encryption).

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anyway, I have send this issue to ask.wireshark also. they said that TP-data malformed. but still confuse, how come, because i used "fresh" openbts installation and without any chnges the parameter, except gsmtap fiture. :sad:

is there anyone here ever capture messge over OpenBTS before? some of tutorial I saw, could get it as plain text also without any changing on its configurations..

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You may need an additional plugin or settings enabled, but wireshark should be capable of reading the unencrypted 2G data. Try display filter gsm_map.ms.sai_Present but if you already see the data and malformed, I'm thinking it may be still encrypted or something else not setup properly.

http://wiki.wireshark.org/GsmProtocolFamily

Edited by digip
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