SOPS (de près), passez un savon à vos secrets en clair !

@sylvain_metayer

Sylvain MÉTAYER

https://sylvain.dev

Tech Lead @Onepoint

Cas d’usage

Où persister la valeur des secrets ?

https://github.com/getsops/sops

Depuis 2015
CNCF Sandbox
Outil auto-suffisant
Types de fichiers : yaml, json, ini, .env

Exemple

file.yml

password: a secure password for TNT !

Structure d’un fichier

secrets.yml

password: ENC[AES256_GCM,data:7qAMf6mdhay/HGeVgMK1aoql/Li/LRbjv5QT,iv:X/WGzvwAGvGPOrQuaA9nH73wFkto7riqc/NlV9cwNfg=,tag:tLk/AYKEhMFnbZIgEo8aiQ==,type:str]
sops:
    kms: []
    gcp_kms: []
    azure_kv: []
    hc_vault: []
    age:
        - recipient: age16rspnzt6j2qxa2587t6umh9qykrqu2amrr0hx9xt2z7elyky3a3q4p5s7l
          enc: |
            -----BEGIN AGE ENCRYPTED FILE-----
            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSArU3JTUi95ZW1ZS0FsRUt6
            dklXOWRuY0k3clRGc2hzcW90UCtvTTRJazFjCkxMNEJYYzE4c1dMYW8wWDNwSk12
            clhCK25RbWZzc1laT0Nib1dFVnIyc0EKLS0tIHJCS3Z1Y0ZMWFp1RzdkSG8reE55
            NFhQR2VWTFcwMkhoMEpjOUxWbXVCdkEKs+47mS6jYpm5LYlq+NEIOwpqvyLtfsyS
            FmyNQh3Ob1CL/1iNaCQsZeFV/k763AIJ4JT6M2hdiQCoVNNJUBwrXw==
            -----END AGE ENCRYPTED FILE-----
    lastmodified: "2025-02-07T08:36:33Z"
    mac: ENC[AES256_GCM,data:qQ3XYVGv4Q9eevbRJau74yjg+gTLLt3JStUvbqxXQsS+6PpWb1Ma2qmQwSkqGThFqXuRtDvEBu8Pf1gBcDGlnMuALJtJLzQ6Kgrn5lk2k1Yz2x5ile5tTSBgk0fmJqdv2Lu+dvfBtdu6WvT/PNRgmMNWqdWPn8JMiIV41Bqd8lM=,iv:aTGYUwe4DfjD+m7q9qedPHcBkRnOmwniGTaIhP9J7UY=,tag:Z2BieOQXZ8yea0rYtB2DBQ==,type:str]
    pgp: []
    unencrypted_suffix: _unencrypted
    version: 3.9.3

Méthodes de chiffrement

Chiffrement avec age^[1]

Exemple de clé age

$ age-keygen
# created: 2024-03-08T15:17:28+01:00
# public key: age14trf5fvhkppd8suunru9mg7dkk9r6ndzwc7tnw45yufs2j9h3u9qqwttxu
AGE-SECRET-KEY-1RM9QASYLNVDQ48HDY5ST7RUXX4LFWPR6PTUHUFG7N5RYUG0PNLLSG6D70R

1. Mais aussi : AWS KMS, GCP KMS, Azure Key Vault et PGP

Chiffrement d’un nouveau fichier

sops --age \
age14trf5fvhkppd8suunru9mg7dkk9r6ndzwc7tnw45yufs2j9h3u9qqwttxu \
secrets.yaml

Chiffrement d’un fichier existant

sops -e -i --age \
age14trf5fvhkppd8suunru9mg7dkk9r6ndzwc7tnw45yufs2j9h3u9qqwttxu \
secrets.yaml

Chiffrement partiel

sops -e -i --encrypted-suffix password --age \
age14trf5fvhkppd8suunru9mg7dkk9r6ndzwc7tnw45yufs2j9h3u9qqwttxu \
secrets.yaml

Déchiffrement

export SOPS_AGE_KEY_FILE=/path/to/my/private/key
sops -d secrets.yaml

Mise à jour

sops secrets.yaml

⚠️	Il est nécessaire d’avoir accès à la clé privée pour éditer le fichier

Si on veut autre chose que vim

EDITOR="code --wait" sops secrets.yaml

💡	--wait : Wait for the files to be closed before returning.

Éxecution dans un processus

$ sops exec-env 01-sops-file.yaml 'echo $password'
a secure password for TNT !

Gestion des destinataires

With sops cli

sops -r -i --add-age PUB_KEY,PUB_KEY2 secrets.yaml
sops -r -i --rm-age PUB_KEY secrets.yaml

.sops.yaml

creation_rules:
  - path_regex: .*\.?dev\.yaml
    encrypted_suffix: 'password'
    key_groups:
      - age:
          - age1pcutm2ytcnn5t2zpj4dvvqhzxw5dcj0gfqplevtev7h8j9hf397s22uacq
          - age1248xnnj285mc759u43dv99fzlkgpf82khtm7jzepet70hnz33u2sln6v5a
  - path_regex: .*\.?prod\.yaml
    key_groups:
      - age:
          - age1pcutm2ytcnn5t2zpj4dvvqhzxw5dcj0gfqplevtev7h8j9hf397s22uacq

Démo

./demo.sh

Pas très lisible tout ça ?

$ git diff 34526..3933
diff --git a/code/recipients/example-diff-secrets.yaml b/code/recipients/example-diff-secrets.yaml
index be346d4..7210f74 100644
--- a/code/recipients/example-diff-secrets.yaml
+++ b/code/recipients/example-diff-secrets.yaml
@@ -1,21 +1,21 @@
-password: ENC[AES256_GCM,data:EuHISKWakII=,iv:1i5ZMWseSJpcZoPdkdhNHaytlapMD5J4MmYJDSjPetA=,tag:SleSVvjR9arBbVIpUeFC5Q==,type:str]
+password: ENC[AES256_GCM,data:RlVe+IAXalyz75NeVqsS64gqRQ==,iv:dq/Yd+25rH2a9pXHYMQ4Qs1qxDPcO5JCIL1TlT+yxG4=,tag:Es0gSsnabjyx4UcHiN91eA==,type:str]
[...]

Pas très lisible tout ça ?

$ git config diff.sopsdiffer.textconv "sops -d"
$ cat .gitattributes
code/recipients/example-diff-secrets.yaml diff=sopsdiffer
$ git diff 34526..3933
diff --git a/code/recipients/example-diff-secrets.yaml b/code/recipients/example-diff-secrets.yaml
index be346d4..7210f74 100644
--- a/code/recipients/example-diff-secrets.yaml
+++ b/code/recipients/example-diff-secrets.yaml
@@ -1 +1 @@
-password: password
+password: ThisIsARealPassword

Conclusion

Et plus encore !

Slides

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