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feat: implement secure boot from disk
This includes sd-boot handling, EFI variables, etc. There are some TODOs which need to be addressed to make things smooth. Install to disk, upgrades work. Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>
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69 changes: 69 additions & 0 deletions
69
internal/app/machined/pkg/runtime/v1alpha1/bootloader/sdboot/efivars.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
|
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| package sdboot | ||
|
|
||
| import ( | ||
| "errors" | ||
|
|
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| "github.com/ecks/uefi/efi/efiguid" | ||
| "github.com/ecks/uefi/efi/efivario" | ||
| "golang.org/x/text/encoding/unicode" | ||
| ) | ||
|
|
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| // SystemdBootGUIDString is the GUID of the SystemdBoot EFI variables. | ||
| const SystemdBootGUIDString = "4a67b082-0a4c-41cf-b6c7-440b29bb8c4f" | ||
|
|
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| // SystemdBootGUID is the GUID of the SystemdBoot EFI variables. | ||
| var SystemdBootGUID = efiguid.MustFromString(SystemdBootGUIDString) | ||
|
|
||
| // Variable names. | ||
| const ( | ||
| LoaderEntryDefaultName = "LoaderEntryDefault" | ||
| LoaderEntrySelectedName = "LoaderEntrySelected" | ||
| LoaderConfigTimeoutName = "LoaderConfigTimeout" | ||
| ) | ||
|
|
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| // ReadVariable reads a SystemdBoot EFI variable. | ||
| func ReadVariable(c efivario.Context, name string) (string, error) { | ||
| _, data, err := efivario.ReadAll(c, name, SystemdBootGUID) | ||
| if err != nil { | ||
| if errors.Is(err, efivario.ErrNotFound) { | ||
| return "", nil | ||
| } | ||
|
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| return "", err | ||
| } | ||
|
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| out := make([]byte, len(data)) | ||
|
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| decoder := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM).NewDecoder() | ||
|
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| n, _, err := decoder.Transform(out, data, true) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| if n > 0 && out[n-1] == 0 { | ||
| n-- | ||
| } | ||
|
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| return string(out[:n]), nil | ||
| } | ||
|
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| // WriteVariable reads a SystemdBoot EFI variable. | ||
| func WriteVariable(c efivario.Context, name, value string) error { | ||
| out := make([]byte, (len(value)+1)*2) | ||
|
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| encoder := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM).NewEncoder() | ||
|
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| n, _, err := encoder.Transform(out, []byte(value), true) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| out = append(out[:n], 0, 0) | ||
|
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| return c.Set(name, SystemdBootGUID, efivario.BootServiceAccess|efivario.RuntimeAccess|efivario.NonVolatile, out) | ||
| } |
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