Air-Gapped Persistence & 3GPP Specs

Hardware AccessPre-configured

Overview & Purpose

Field assessments frequently occur in classified or air-gapped cellular labs with zero internet access. TelcoChisel provides field utilities including `telcosec-create-usb` for automated creation of bootable flash drives with LUKS-encrypted persistence, `telcosec-download-openapi` for bulk offline caching of 3GPP Rel 15-18 SBA OpenAPI schemas, and pre-tuned Wireshark telecom dissector colorfilters.

Verification Command

Run the following to confirm this configuration is active on your system:

Air-Gapped Persistence & 3GPP Specs — Verification
which telcosec-create-usb telcosec-download-openapi

Configuration Details & Steps

TelcoChisel applies these settings automatically at ISO build time. The following steps document each configuration item:

  1. 1
    Inspect the bootable USB creation wizard: telcosec-create-usb --help
  2. 2
    Fetch and cache official 3GPP SBA OpenAPI specifications: telcosec-download-openapi
  3. 3
    Inspect cached 3GPP OpenAPI specifications: ls -la /usr/share/telcosec/openapi/ || ls -la /opt/telcosec/openapi/
  4. 4
    Switch Wireshark telecom dissector profiles and color rules: telcosec-profile

Troubleshooting

Common Issues
When running `telcosec-create-usb`, verify that the target device is unmounted (`lsblk`) and you have specified the correct device path (e.g. `/dev/sdb`, not a partition like `/dev/sdb1`).

Frequently Asked Questions

What 3GPP releases does 'telcosec-download-openapi' support?

It pulls official 3GPP 5G Service Based Architecture (SBA) specifications across Release 15, Release 16, Release 17, and Release 18.

How do Wireshark colorfilters improve telecom analysis?

They highlight critical signaling messages (5G NAS Registration/Security, NGAP Initial Context, SCTP ABORT/SHUTDOWN, Diameter Errors, and GTP-C Path Failures) with distinct color palettes.

Can 'telcosec-create-usb' format both UEFI and Legacy BIOS drives?

Yes. It creates a hybrid partition layout containing an EFI System Partition (FAT32) and an ext4/LUKS persistence partition.

HANDS-ON TELECOM LABS

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