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feat: support reading secret env vars from _FILE (#799)

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Co-authored-by: Kyle Mendell <ksm@ofkm.us>
This commit is contained in:
Alessandro (Ale) Segala
2025-07-30 18:59:25 +02:00
committed by GitHub
parent d479817b6a
commit 0a3b1c6530
4 changed files with 103 additions and 47 deletions
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18
backend/internal/utils/jwk/utils.go
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@@ -15,7 +15,6 @@ import (
"fmt"
"hash"
"io"
"os"
"github.com/lestrrat-go/jwx/v3/jwa"
"github.com/lestrrat-go/jwx/v3/jwk"
@@ -47,26 +46,15 @@ func EncodeJWKBytes(key jwk.Key) ([]byte, error) {
// LoadKeyEncryptionKey loads the key encryption key for JWKs
func LoadKeyEncryptionKey(envConfig *common.EnvConfigSchema, instanceID string) (kek []byte, err error) {
// Try getting the key from the env var as string
kekInput := []byte(envConfig.EncryptionKey)
// If there's nothing in the env, try loading from file
if len(kekInput) == 0 && envConfig.EncryptionKeyFile != "" {
kekInput, err = os.ReadFile(envConfig.EncryptionKeyFile)
if err != nil {
return nil, fmt.Errorf("failed to read key file '%s': %w", envConfig.EncryptionKeyFile, err)
}
}
// If there's still no key, return
if len(kekInput) == 0 {
// If there's no key, return
if len(envConfig.EncryptionKey) == 0 {
return nil, nil
}
// We need a 256-bit key for encryption with AES-GCM-256
// We use HMAC with SHA3-256 here to derive the key from the one passed as input
// The key is tied to a specific instance of Pocket ID
h := hmac.New(func() hash.Hash { return sha3.New256() }, kekInput)
h := hmac.New(func() hash.Hash { return sha3.New256() }, []byte(envConfig.EncryptionKey))
fmt.Fprint(h, "pocketid/"+instanceID+"/jwk-kek")
kek = h.Sum(nil)