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jimmyRandyxxhero
bc0c103d79
Signed-off-by: Jim Robinson <1643772+jimmyR@users.noreply.github.com> Signed-off-by: yxxhero <aiopsclub@163.com> Co-authored-by: yxxhero <aiopsclub@163.com>
120 lines
3.6 KiB
Markdown
120 lines
3.6 KiB
Markdown
# Secrets
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helmfile can handle secrets using [helm-secrets](https://github.com/jkroepke/helm-secrets) plugin or using remote secrets storage
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(everything that package [vals](https://github.com/helmfile/vals) can handle vault, AWS SSM etc)
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This section will describe the second use case.
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# Remote secrets
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This paragraph will describe how to use remote secrets storage (vault, SSM etc) in helmfile
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## Fetching single key
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To fetch single key from remote secret storage you can use `fetchSecretValue` template function example below
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```yaml
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# helmfile.yaml
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repositories:
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- name: stable
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url: https://charts.helm.sh/stable
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---
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environments:
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default:
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values:
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- service:
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password: ref+vault://svc/#pass
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login: ref+vault://svc/#login
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releases:
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- name: service
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namespace: default
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labels:
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cluster: services
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secrets: vault
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chart: stable/svc
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version: 0.1.0
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values:
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- service:
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login: {{ .Values.service.login | fetchSecretValue }} # this will resolve ref+vault://svc/#pass and fetch secret from vault
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password: {{ .Values.service.password | fetchSecretValue | quote }}
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# - values/service.yaml.gotmpl # alternatively
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```
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## Fetching multiple keys
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Alternatively you can use `expandSecretRefs` to fetch a map of secrets
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```yaml
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# values/service.yaml.gotmpl
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service:
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{{ .Values.service | expandSecretRefs | toYaml | nindent 2 }}
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```
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This will produce
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```yaml
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# values/service.yaml
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service:
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login: svc-login # fetched from vault
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password: pass
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```
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## Disabling vals
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You can disable the built-in vals processing using environment variables:
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### Pass-through mode
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Set `HELMFILE_DISABLE_VALS=true` to disable internal vals processing. Any `ref+` values will pass through unchanged, allowing you to validate them with a policy tool such as [conftest](https://www.conftest.dev/) before they are resolved:
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```bash
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HELMFILE_DISABLE_VALS=true helmfile template | conftest test -
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```
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### Strict mode
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Set `HELMFILE_DISABLE_VALS_STRICT=true` to disable vals and error if any `ref+` values are detected. This is useful when you want to prevent users from using vals references:
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```bash
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HELMFILE_DISABLE_VALS_STRICT=true helmfile sync
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# Error: vals is disabled via HELMFILE_DISABLE_VALS_STRICT environment variable
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```
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Note: If both are set, strict mode takes precedence.
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Strict mode detects any `ref+<provider>://` or `secretref+<provider>://` expression, including nested ones in maps and arrays. Plain strings that merely contain the text `ref+` (without a provider scheme) are not vals references and do not trigger the error.
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### Validating ref+ expressions with conftest
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You can use `HELMFILE_DISABLE_VALS=true` with [conftest](https://www.conftest.dev/) to validate that all `ref+` expressions conform to your security policy before processing them.
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Example rego policy (`policy/vals_refs.rego`):
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```rego
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package main
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allowed_refs := {
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"ref+tfstates3://my-terraform-state/networking/eu-west-2/vpc/vpc_id",
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"ref+tfstates3://my-terraform-state/networking/eu-west-2/vpc/private_subnet_ids",
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"ref+tfstates3://my-terraform-state/platform/eu-west-2/eks/cluster_endpoint",
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}
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deny[msg] {
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value := input[_]
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startswith(value, "ref+tfstates3://")
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not allowed_refs[value]
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msg := sprintf("ref+ expression references an unapproved tfstates3 URI: %s", [value])
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}
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deny[msg] {
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value := input[_]
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startswith(value, "ref+")
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not startswith(value, "ref+tfstates3://")
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msg := sprintf("only tfstates3 ref+ expressions are permitted, got: %s", [value])
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}
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```
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Run against your rendered values:
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```bash
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HELMFILE_DISABLE_VALS=true helmfile template | conftest test -
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```
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