go-tcg-storage

Go library for interfacing TCG Storage and Security Subsystem Class (SSC) functions on storage devices.

Supported (or planned) standards:

Need support for another standard? Let us know by filing a feature request!

Tools

sedlockctl is a tool that helps you manage SED/TCG drives.
Install it: go install github.com/bluecmd/go-tcg-storage/cmd/sedlockctl@main
tcgsdiag lets you list a whole lot of diagnostic information about TCG drives.
Install it: go install github.com/bluecmd/go-tcg-storage/cmd/tcgsdiag@main
tcgdiskstat is like blkid or lsscsi but for TCG drives.
Install it: go install github.com/bluecmd/go-tcg-storage/cmd/tcgdiskstat@main

Supported Transports

The following transports are supported by the library:

NVMe
SATA
SAS

Need another transport? You can do one of two things:

You can implement the drive interface yourself to talk to your device.
You can file a feature request describing your setup and we can discuss implementing it

Usage

The library consists of multiple libraries in order to abstract away the functionallity the library user does not need to care about. The library does not rely on the in-kernel implementation of TCG Opal[1].

The most low-level interface is the drive interface that implements the IF-SEND and IF-RECV functions that the TCG Storage standards rely on. Likely nobody outside this library will find that library useful.

One abstraction up is the core library that implements the TCG Storage specifications in a quite verbose manner. The guiding principle with the core library is that you should be able to do anything with it, but it might require you to know what functions can be called under what circumstances.

Finally you have the locking library that implements the most likely reason you are reading this. It allows you to get access to, and modify, the locking ranges of a TCG Storage compliant drive without caring much what version of the standards the drive is implementing.

Core Library

import (
	tcg "github.com/bluecmd/go-tcg-storage/pkg/core"
	"github.com/bluecmd/go-tcg-storage/pkg/core/table"
	"github.com/bluecmd/go-tcg-storage/pkg/drive"
)

func main() {
	d, err := drive.Open("/dev/sda")
	defer d.Close()

	d0, err := tcg.Discovery0(d)
        // This will work if your drive implements GET_COMID,
        // otherwise you will need to figure out the ComID and
        // pass it in with WithComID(x)
        cs, err := tcg.NewControlSession(d, d0)
        defer cs.Close()
        s, err := cs.NewSession(tcg.AdminSP)
        defer s.Close()

        // This is how you call a method on your SP:
        rand, err := table.ThisSP_Random(s, 8 /* bytes to generate */)
        
        // You can authenticate using the MSID like this:
        msidPin, err := table.Admin_C_PIN_MSID_GetPIN(s)
        if err := table.ThisSP_Authenticate(s, tcg.AuthoritySID, msidPin); err != nil {
        	log.Fatalf("Authentication as SID failed!")
        }
        // Session is now elevated
}

Locking Library

The most minimal example looks something like this:

import (
	"github.com/bluecmd/go-tcg-storage/pkg/drive"
	"github.com/bluecmd/go-tcg-storage/pkg/locking"
)

func main() {
	d, err := drive.Open("/dev/sda")
	defer d.Close()

	cs, lmeta, err := locking.Initialize(d)
	defer cs.Close()
	l, err := locking.NewSession(cs, lmeta, locking.DefaultAuthorityWithMSID)
	defer l.Close()
	fmt.Printf("Authenticated user has %d locking ranges", len(l.Ranges))
}

A slightly more realistic example looks like this:

import (
	"github.com/bluecmd/go-tcg-storage/pkg/drive"
	"github.com/bluecmd/go-tcg-storage/pkg/locking"
)

func main() {
	d, err := drive.Open("/dev/sda")
	defer d.Close()

        password := []byte{} /* Password for Admin1 or BandMaster0 */
	cs, lmeta, err := locking.Initialize(d,
		locking.WithAuth(locking.DefaultAuthorityWithMSID)
		locking.WithTakeOwnership(password),
		locking.WithHardening())
	defer cs.Close()
	l, err := locking.NewSession(cs, lmeta, locking.DefaultAuthority(password))
	defer l.Close()
	fmt.Printf("Authenticated user has %d locking ranges", len(l.Ranges))
}

Tested drives

These drives have been found to work without issues

Manufacturer	Model	Transport	Features
Seagate	Momentus Thin (ST500LT015)	SATA	Opal v2
Seagate	7E2000 (ST2000NX0343)	SAS3	Enterprise
Seagate	Exos X14 (ST10000NM0608)	SAS3	Enterprise
Samsung	SSD 860	SATA	Opal v2
Samsung	SSD 970 EVO Plus	NVMe	Opal v2
Samsung	PM983 (MZ1LB1T9HALS)	NVMe	Opal v2
Samsung	PM9A1 (MZVL2256HCHQ)	NVMe	Pyrite v2
Samsung	PM9A3 (MZQL23T8HCLS)	NVMe	Opal v2
Sabrent	Rocket 4.0 2TB	NVMe	Pyrite v2
Toshiba	MG08SCP16TE	SAS3	Enterprise