Merge pull request #116 from jk-cluster/feat/values-schema-samba
samba: strict values.schema.json + Null-Absicherung (Welle 2, #68/#99)
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@@ -5,6 +5,6 @@ icon: https://avatars.githubusercontent.com/u/13281359
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type: application
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version: 5.0.0+up4.23.10
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version: 6.0.0+up4.23.10
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appVersion: 4.23.10
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@@ -114,3 +114,168 @@ template-chart is the reference implementation.
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1
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{{- end -}}
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{{- end -}}
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{{/*
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Merge a user-supplied values sub-tree onto a dict of chart defaults so that a
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null / empty override falls back to the defaults instead of erasing them.
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Input: dict "defaults" <dict> "given" <dict|nil> "path" <string, optional
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values path used in error messages>. Output: YAML of the merged dict (consume
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it with fromYaml).
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Why this exists (issue #99): Helm merges values maps recursively, but an
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override key written without children — e.g. a leftover
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securityContext:
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after deleting its last remaining sub-key — is YAML null. Where the chart
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defines a default, Helm treats that null as a deletion of the default; the
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template then renders "securityContext: null". The workload starts and reports
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healthy while being unhardened, so nothing points at the mistake. The same
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shape erases a probe (it disappears) or the resources block (no requests, no
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computed limits). This helper defines the opposite semantics: an empty block
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means "chart defaults apply".
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Rules:
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- a nil "given" is treated as an empty dict (all defaults apply).
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- a key whose override value is null keeps the default (nulls never delete).
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- a key present in both as a map is merged recursively, so a partially
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filled block only overrides the keys it actually sets.
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- a scalar override for a key the defaults define as a map is rejected with
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a message naming the values path, instead of failing later with a template
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field error.
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- any other set value wins as given, including an explicit false or 0 —
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Helm's "default" and sprig's "mergeOverwrite" would both swallow those
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zero values, hence the explicit kindIs "invalid" nil check.
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- keys only present in the override are passed through unchanged.
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NOTE: like the helpers above, this is duplicated into every chart's
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templates/_helpers.tpl with the chart's name as define prefix, because charts
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in this repo deliberately have no dependencies.
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*/}}
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{{- define "samba.defaultedDict" -}}
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{{- $defaults := .defaults | default dict -}}
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{{- $given := .given -}}
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{{- $path := .path | default "value" -}}
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{{- if kindIs "invalid" $given -}}
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{{- $given = dict -}}
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{{- end -}}
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{{- if not (kindIs "map" $given) -}}
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{{- fail (printf "%s must be a mapping or null, got %s (%v)" $path (kindOf $given) $given) -}}
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{{- end -}}
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{{- $out := deepCopy $defaults -}}
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{{- range $key, $value := $given -}}
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{{- if not (kindIs "invalid" $value) -}}
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{{- $default := index $defaults $key -}}
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{{- if and (kindIs "map" $value) (kindIs "map" $default) -}}
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{{- $_ := set $out $key (fromYaml (include "samba.defaultedDict" (dict "defaults" $default "given" $value "path" (printf "%s.%s" $path $key)))) -}}
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{{- else if kindIs "map" $default -}}
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{{- fail (printf "%s.%s must be a mapping or null, got %s (%v)" $path $key (kindOf $value) $value) -}}
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{{- else -}}
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{{- $_ := set $out $key $value -}}
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{{- end -}}
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{{- end -}}
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{{- end -}}
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{{- toYaml $out -}}
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{{- end -}}
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{{/*
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Pick one sub-block out of a values block that may itself be null.
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Input: dict "block" <dict|nil> "key" <string> "path" <string>.
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Returns YAML of dict "value" <the sub-block, may be nil>, after rejecting a
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non-mapping block with a message that names the values path. Needed because
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".Values.samba.securityContext" can itself be erased.
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*/}}
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{{- define "samba.subBlock" -}}
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{{- $block := .block -}}
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{{- if kindIs "invalid" $block -}}
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{{- $block = dict -}}
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{{- end -}}
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{{- if not (kindIs "map" $block) -}}
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{{- fail (printf "%s must be a mapping or null, got %s (%v)" .path (kindOf $block) $block) -}}
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{{- end -}}
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{{- toYaml (dict "value" (index $block .key)) -}}
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{{- end -}}
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{{/*
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The effective security contexts, probes and resources (issue #99).
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The defaults below MUST stay in sync with the corresponding blocks in
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values.yaml, which stays the documented, user-facing place for them; this copy
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is only the fallback for the case where an override has erased the block.
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IMPORTANT - this chart's hardening is a DOCUMENTED DEVIATION forced by the
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ghcr.io/dockur/samba image, and these fallbacks reproduce it exactly rather
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than restoring the repo standard, which would break the file server:
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- No runAsNonRoot: the entrypoint creates the Unix users from users.conf
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(groupadd/adduser/usermod) and smbd impersonates the authenticated share
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user per session; both require starting as root.
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- readOnlyRootFilesystem stays false: the entrypoint writes /etc/passwd and
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/etc/group, the /etc/samba.conf healthcheck symlink, mkdir /shared and the
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Samba TDB databases under /var/lib/samba.
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- capabilities.add is NOT empty: NET_BIND_SERVICE (ports 445/139),
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SETUID/SETGID (per-session impersonation) and CHOWN/FOWNER/DAC_OVERRIDE
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(managing share files on behalf of the users).
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- The pod context sets only fsGroup, no runAs* values.
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SMB is not an HTTP protocol, so the probes target the SMB TCP port directly.
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*/}}
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{{- define "samba.podSecurityContext" -}}
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{{- $given := (fromYaml (include "samba.subBlock" (dict "block" . "key" "pod" "path" "samba.securityContext"))).value -}}
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{{- $defaults := dict
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"fsGroup" 1000 -}}
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{{- include "samba.defaultedDict" (dict "defaults" $defaults "given" $given "path" "samba.securityContext.pod") -}}
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{{- end -}}
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{{- define "samba.containerSecurityContext" -}}
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{{- $given := (fromYaml (include "samba.subBlock" (dict "block" . "key" "container" "path" "samba.securityContext"))).value -}}
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{{- $defaults := dict
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"allowPrivilegeEscalation" false
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"readOnlyRootFilesystem" false
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"capabilities" (dict
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"drop" (list "ALL")
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"add" (list "CHOWN" "DAC_OVERRIDE" "FOWNER" "NET_BIND_SERVICE" "SETGID" "SETUID")) -}}
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{{- include "samba.defaultedDict" (dict "defaults" $defaults "given" $given "path" "samba.securityContext.container") -}}
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{{- end -}}
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{{- define "samba.livenessProbe" -}}
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{{- $defaults := dict
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"tcpSocket" (dict "port" 445)
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 3 -}}
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{{- include "samba.defaultedDict" (dict "defaults" $defaults "given" . "path" "samba.livenessProbe") -}}
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{{- end -}}
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{{- define "samba.readinessProbe" -}}
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{{- $defaults := dict
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"tcpSocket" (dict "port" 445)
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 3 -}}
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{{- include "samba.defaultedDict" (dict "defaults" $defaults "given" . "path" "samba.readinessProbe") -}}
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{{- end -}}
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{{- define "samba.startupProbe" -}}
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{{- $defaults := dict
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"tcpSocket" (dict "port" 445)
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"periodSeconds" 5
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"timeoutSeconds" 5
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"failureThreshold" 30 -}}
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{{- include "samba.defaultedDict" (dict "defaults" $defaults "given" . "path" "samba.startupProbe") -}}
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{{- end -}}
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{{/*
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The effective resources block, fed into the resources helper above so that an
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erased "resources:" still yields the chart's requests and computed limits
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instead of a container without any resource accounting.
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*/}}
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{{- define "samba.effectiveResources" -}}
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{{- $defaults := dict
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"limitFactor" 3
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"requests" (dict "memory" "50Mi" "cpu" 0.1 "ephemeralStorage" "50Mi") -}}
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{{- $merged := fromYaml (include "samba.defaultedDict" (dict "defaults" $defaults "given" . "path" "samba.resources")) -}}
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{{- include "samba.resources" $merged -}}
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{{- end -}}
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@@ -73,19 +73,19 @@ spec:
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mountPath: "/shares/{{ $value.name }}"
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{{- end }}
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livenessProbe:
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{{- toYaml .Values.samba.livenessProbe | nindent 12 }}
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{{- include "samba.livenessProbe" .Values.samba.livenessProbe | nindent 12 }}
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readinessProbe:
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{{- toYaml .Values.samba.readinessProbe | nindent 12 }}
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{{- include "samba.readinessProbe" .Values.samba.readinessProbe | nindent 12 }}
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startupProbe:
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{{- toYaml .Values.samba.startupProbe | nindent 12 }}
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{{- include "samba.startupProbe" .Values.samba.startupProbe | nindent 12 }}
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resources:
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{{- include "samba.resources" .Values.samba.resources | nindent 12 }}
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{{- include "samba.effectiveResources" .Values.samba.resources | nindent 12 }}
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securityContext:
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{{- toYaml .Values.samba.securityContext.container | nindent 12 }}
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{{- include "samba.containerSecurityContext" .Values.samba.securityContext | nindent 12 }}
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restartPolicy: Always
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automountServiceAccountToken: false
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securityContext:
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{{- toYaml .Values.samba.securityContext.pod | nindent 8 }}
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{{- include "samba.podSecurityContext" .Values.samba.securityContext | nindent 8 }}
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volumes:
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- name: smb-config
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configMap:
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@@ -0,0 +1,192 @@
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{
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"$schema": "https://json-schema.org/draft-07/schema#",
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"title": "samba values",
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"description": "Strict values schema (issue #68). additionalProperties is false on every chart-owned object level, so a key that the chart does not read is rejected at render time instead of being silently ignored. The only objects that stay open are the ones passed verbatim into the Kubernetes pod spec (probes, security contexts, global) - the chart does not interpret their contents, so it cannot judge which keys are meaningful. The hardening, probe and resources blocks additionally accept null, because an erased block falls back to the chart defaults (issue #99).",
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"global": {
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"description": "Helm's conventional cross-chart values. Unused by this chart, kept open so an umbrella install cannot break on it.",
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"type": "object"
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},
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"scaleDown": {
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"type": "boolean"
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},
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"secrets": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"sambaUsersSecretRef": {
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"description": "op:// item path for the users.conf Secret. Note the exact name: a shortened 'sambaUsersRef' is NOT read by the chart.",
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"type": ["string", "null"]
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}
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}
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},
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"samba": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"replicas": {
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"type": "integer",
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"minimum": 0
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},
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"smbNodePort": {
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"type": ["integer", "null"],
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"minimum": 1,
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"maximum": 65535
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},
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"netbiosNodePort": {
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"type": ["integer", "null"],
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"minimum": 1,
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"maximum": 65535
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},
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"shares": {
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"description": "One SMB share per entry. Each entry drives a share section in smb.conf, a PVC and a volumeMount, so the list is part of the pod template - changing it restarts the workload by design.",
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"type": ["array", "null"],
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"items": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"name": {
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"type": ["string", "null"]
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},
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"validUsers": {
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"description": "Comma-separated user list, rendered as 'valid users' in the share section.",
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"type": ["string", "null"]
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},
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"description": {
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"type": ["string", "null"]
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},
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"size": {
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"description": "Size of the PVC provisioned for this share.",
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"type": ["string", "null"]
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}
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}
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}
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},
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"env": {
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"$ref": "#/definitions/env"
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},
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"livenessProbe": {
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"$ref": "#/definitions/probe"
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},
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"readinessProbe": {
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"$ref": "#/definitions/probe"
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},
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"startupProbe": {
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"$ref": "#/definitions/probe"
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},
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"resources": {
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"$ref": "#/definitions/resources"
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},
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"securityContext": {
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"$ref": "#/definitions/securityContext"
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},
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"globalConfig": {
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"description": "Currently read by no template - see the note in the PR that introduced this schema. Kept allowed because it is part of the published values surface; whether it gets implemented or removed is a separate decision.",
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"type": ["string", "null"]
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},
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"storageClass": {
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"type": ["string", "null"]
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}
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}
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}
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},
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"definitions": {
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"resources": {
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"description": "May be null / empty: the chart then falls back to its default requests and computed limits (issue #99) instead of rendering a container without resource accounting.",
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"type": ["object", "null"],
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"additionalProperties": false,
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"properties": {
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"limitFactor": {
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"type": "number",
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"exclusiveMinimum": 0
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},
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"requests": {
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"$ref": "#/definitions/resourceList"
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},
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"limits": {
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"$ref": "#/definitions/resourceList"
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}
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}
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},
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"resourceList": {
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"type": ["object", "null"],
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"additionalProperties": false,
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"properties": {
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"cpu": {
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"type": ["string", "number", "null"]
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},
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"memory": {
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"type": ["string", "number", "null"]
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},
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"ephemeral-storage": {
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"type": ["string", "number", "null"]
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},
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"ephemeralStorage": {
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"type": ["string", "number", "null"]
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}
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}
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},
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"env": {
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"type": "array",
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"items": {
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"type": "object",
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"additionalProperties": false,
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"required": ["name"],
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"properties": {
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"name": {
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"type": "string"
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},
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"value": {
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"type": "string"
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},
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"valueFrom": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"secretKeyRef": {
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"$ref": "#/definitions/keyRef"
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},
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"configMapKeyRef": {
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"$ref": "#/definitions/keyRef"
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}
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}
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}
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}
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}
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},
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"keyRef": {
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"type": "object",
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"additionalProperties": false,
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"required": ["name", "key"],
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"properties": {
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"name": {
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"type": "string"
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},
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"key": {
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"type": "string"
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}
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}
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},
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"securityContext": {
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"description": "May be null / empty at any level: the chart then falls back to its hardening defaults (issue #99). Note that this chart's hardening is a documented deviation forced by the image (root start for user creation and per-session impersonation, writable root filesystem, non-empty capabilities.add), and the fallbacks reproduce that deviation exactly.",
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"type": ["object", "null"],
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"additionalProperties": false,
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"properties": {
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"pod": {
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"description": "Merged onto the chart's pod defaults and rendered as the pod's securityContext; kept open because the chart does not interpret the individual fields.",
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"type": ["object", "null"]
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},
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"container": {
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"description": "Merged onto the chart's container defaults and rendered as the container's securityContext; kept open because the chart does not interpret the individual fields.",
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"type": ["object", "null"]
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}
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}
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},
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"probe": {
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"description": "Merged onto the chart's probe defaults and rendered as a container probe; kept open because the chart does not interpret the individual fields. May be null / empty, which means the defaults apply (issue #99) rather than the probe disappearing.",
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"type": ["object", "null"]
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}
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}
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}
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