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-rw-r--r--docker/bckp/kv_to_s3.go54
1 files changed, 51 insertions, 3 deletions
diff --git a/docker/bckp/kv_to_s3.go b/docker/bckp/kv_to_s3.go
index 76dc0d7..4cc2133 100644
--- a/docker/bckp/kv_to_s3.go
+++ b/docker/bckp/kv_to_s3.go
@@ -1,21 +1,42 @@
package main
import (
"github.com/hashicorp/consul/api"
- /*"crypto/aes"*/
+ "errors"
"log"
+ "fmt"
+ "os"
+ "encoding/base64"
/*"github.com/aws/aws-sdk-go/service/s3"*/
)
+const consul_addr string = "KV2S3_CONSUL_ADDR"
+const enc_key string = "KV2S3_ENC_KEY"
+
+const key_exp_bits int = 256
+const key_exp_bytes int = key_exp_bits / 8
+
func errIsPanic(err error, format string, a ...interface{}) {
if err != nil {
log.Panicf(format, a...)
}
}
+func absentIsErr(present bool) error {
+ if !present {
+ return errors.New("Environement variable is not set.")
+ }
+ return nil
+}
+
func main() {
log.Println("starting consul kv backup...")
+
+ //--- Ask Consul to Snapshot our KV
+ var present bool
conf := api.DefaultConfig()
- //@FIXME add later support for a different URL
+ conf.Address, present = os.LookupEnv(consul_addr)
+ err := absentIsErr(present)
+ errIsPanic(err, "%v env required. %v", consul_addr, err)
//@FIXME add later support for HTTPS
options := api.QueryOptions {
@@ -26,9 +47,36 @@ func main() {
consul, err := api.NewClient(conf)
errIsPanic(err, "Unable to build a new client. %v", err)
- _, _, err = consul.Snapshot().Save(&options)
+ reader, _, err := consul.Snapshot().Save(&options)
errIsPanic(err, "Snapshot failed. %v", err)
+ //--- Get encryption key and check it
+ b64_key, present := os.LookupEnv(enc_key)
+ err = absentIsErr(present)
+ errIsPanic(err, "%v env required. %v", enc_key, err)
+ raw_key, err := base64.StdEncoding.DecodeString(b64_key)
+ errIsPanic(err, "Unable to decode base64 key. %v", err)
+
+ err = nil
+ key_size_bytes := len(raw_key)
+ key_size_bits := key_size_bytes
+
+ if key_size_bytes != key_exp_bytes {
+ msg := fmt.Sprintf(
+ "Key size is %d bits (%d bytes) instead of %d bits (%d bytes).",
+ key_size_bits,
+ key_size_bytes,
+ key_exp_bits,
+ key_exp_bytes)
+
+ err = errors.New(msg)
+ }
+ errIsPanic(err, "We deliberately support only 256 bits (32 bytes) keys. %v", err)
+
+ //--- Encryption
+ // Not a simple thing to do it in a streaming manner
+ // To understand why age by Filippo Valsorda seems to be a good fit:
+ // https://neilmadden.blog/2019/12/30/a-few-comments-on-age/
}