182 lines
7.7 KiB
Smarty
182 lines
7.7 KiB
Smarty
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{{/* Returns Container Security Context */}}
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{{/* Call this template:
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{{ include "tc.v1.common.lib.container.securityContext" (dict "rootCtx" $ "objectData" $objectData) }}
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rootCtx: The root context of the chart.
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objectData: The object data to be used to render the container.
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*/}}
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{{- define "tc.v1.common.lib.container.securityContext" -}}
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{{- $rootCtx := .rootCtx -}}
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{{- $objectData := .objectData -}}
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{{/* Initialize from the "global" options */}}
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{{- $secContext := fromJson (include "tc.v1.common.lib.container.securityContext.calculate" (dict "rootCtx" $rootCtx "objectData" $objectData)) }}
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runAsNonRoot: {{ $secContext.runAsNonRoot }}
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runAsUser: {{ $secContext.runAsUser }}
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runAsGroup: {{ $secContext.runAsGroup }}
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readOnlyRootFilesystem: {{ $secContext.readOnlyRootFilesystem }}
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allowPrivilegeEscalation: {{ $secContext.allowPrivilegeEscalation }}
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privileged: {{ $secContext.privileged }}
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seccompProfile:
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type: {{ $secContext.seccompProfile.type }}
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{{- if eq $secContext.seccompProfile.type "Localhost" }}
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localhostProfile: {{ $secContext.seccompProfile.profile }}
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{{- end }}
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capabilities:
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{{- if $secContext.capabilities.add }}
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add:
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{{- range $secContext.capabilities.add }}
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- {{ . }}
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{{- end -}}
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{{- else }}
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add: []
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{{- end -}}
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{{- if $secContext.capabilities.drop }}
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drop:
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{{- range $secContext.capabilities.drop }}
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- {{ . }}
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{{- end -}}
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{{- else }}
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drop: []
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{{- end -}}
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{{- end -}}
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{{/* Calculates Container Security Context */}}
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{{/* Call this template:
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{{ include "tc.v1.common.lib.container.securityContext.calculate" (dict "rootCtx" $ "objectData" $objectData) }}
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rootCtx: The root context of the chart.
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objectData: The object data to be used to render the container.
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*/}}
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{{- define "tc.v1.common.lib.container.securityContext.calculate" -}}
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{{- $rootCtx := .rootCtx -}}
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{{- $objectData := .objectData -}}
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{{- $mustPrivileged := false -}}
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{{- range $persistenceName, $persistenceValues := $rootCtx.Values.persistence -}}
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{{- if $persistenceValues.enabled -}}
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{{- if eq $persistenceValues.type "device" -}}
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{{- $volume := (fromJson (include "tc.v1.common.lib.container.volumeMount.isSelected" (dict "persistenceName" $persistenceName "persistenceValues" $persistenceValues "objectData" $objectData "key" "persistence"))) -}}
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{{- if $volume -}} {{/* If a volume is returned, it means that the container has an assigned device */}}
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{{- $mustPrivileged = true -}}
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{{- end -}}
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{{- end -}}
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{{- end -}}
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{{- end -}}
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{{- if not $rootCtx.Values.securityContext.container -}}
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{{- fail "Container - Expected non-empty <.Values.securityContext.container>" -}}
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{{- end -}}
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{{/* Initialize from the "global" options */}}
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{{- $secContext := mustDeepCopy $rootCtx.Values.securityContext.container -}}
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{{/* Override with containers options */}}
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{{- with $objectData.securityContext -}}
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{{- $secContext = mustMergeOverwrite $secContext . -}}
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{{- end -}}
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{{/* Validations, as we might endup with null values after merge */}}
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{{- range $key := (list "runAsUser" "runAsGroup") -}}
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{{- $value := (get $secContext $key) -}}
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{{- if not (mustHas (kindOf $value) (list "float64" "int" "int64")) -}}
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{{- fail (printf "Container - Expected <securityContext.%s> to be [int], but got [%v] of type [%s]" $key $value (kindOf $value)) -}}
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{{- end -}}
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{{- end -}}
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{{- if or (eq (int $secContext.runAsUser) 0) (eq (int $secContext.runAsGroup) 0) -}}
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{{- $_ := set $secContext "runAsNonRoot" false -}}
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{{- else -}}
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{{- $_ := set $secContext "runAsNonRoot" true -}}
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{{- end -}}
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{{- if $secContext.privileged -}} {{/* When privileged is true, allowPrivilegeEscalation is required */}}
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{{- $_ := set $secContext "allowPrivilegeEscalation" true -}}
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{{- end -}}
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{{- if $mustPrivileged -}}
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{{- $_ := set $secContext "privileged" true -}}
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{{- $_ := set $secContext "allowPrivilegeEscalation" true -}}
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{{- $_ := set $secContext "runAsNonRoot" false -}}
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{{- $_ := set $secContext "runAsUser" 0 -}}
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{{- $_ := set $secContext "runAsGroup" 0 -}}
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{{- end -}}
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{{- range $key := (list "privileged" "allowPrivilegeEscalation" "runAsNonRoot" "readOnlyRootFilesystem") -}}
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{{- $value := (get $secContext $key) -}}
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{{- if not (kindIs "bool" $value) -}}
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{{- fail (printf "Container - Expected <securityContext.%s> to be [bool], but got [%s] of type [%s]" $key $value (kindOf $value)) -}}
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{{- end -}}
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{{- end -}}
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{{- if not $secContext.seccompProfile -}}
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{{- fail "Container - Expected <securityContext.seccompProfile> to be defined" -}}
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{{- end -}}
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{{- $profiles := (list "RuntimeDefault" "Localhost" "Unconfined") -}}
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{{- if not (mustHas $secContext.seccompProfile.type $profiles) -}}
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{{- fail (printf "Container - Expected <securityContext.seccompProfile> to be one of [%s], but got [%s]" (join ", " $profiles) $secContext.seccompProfile.type) -}}
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{{- end -}}
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{{- if eq $secContext.seccompProfile.type "Localhost" -}}
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{{- if not $secContext.seccompProfile.profile -}}
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{{- fail "Container - Expected <securityContext.seccompProfile.profile> to be defined on type [Localhost]" -}}
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{{- end -}}
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{{- end -}}
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{{- if not $secContext.capabilities -}}
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{{- fail "Container - Expected <securityContext.capabilities> to be defined" -}}
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{{- end -}}
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{{- $tempObjectData := (dict "shortName" $objectData.podShortName "primary" $objectData.podPrimary) -}}
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{{- $portRange := fromJson (include "tc.v1.common.lib.helpers.securityContext.getPortRange" (dict "rootCtx" $rootCtx "objectData" $tempObjectData)) -}}
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{{- if and $portRange.low (le (int $portRange.low) 1024) -}} {{/* If a container wants to bind a port <= 1024 add NET_BIND_SERVICE */}}
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{{- $addCap := $secContext.capabilities.add -}}
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{{- if not (mustHas "NET_BIND_SERIVCE" $addCap) -}}
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{{- $addCap = mustAppend $addCap "NET_BIND_SERVICE" -}}
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{{- end -}}
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{{- $_ := set $secContext.capabilities "add" $addCap -}}
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{{- end -}}
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{{/*
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Most containers that run as root, is because it has to chown
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files before switching to another user.
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Lets add automatically the CHOWN cap.
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*/}}
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{{- if eq (int $secContext.runAsUser) 0 -}}
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{{- if not (kindIs "bool" $secContext.capabilities.disableS6Caps) -}}
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{{- fail (printf "Container - Expected <securityContext.capabilities.disableS6Caps> to be [bool], but got [%s] of type [%s]" $secContext.capabilities.disableS6Caps (kindOf $secContext.capabilities.disableS6Caps)) -}}
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{{- end -}}
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{{- $addCap := $secContext.capabilities.add -}}
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{{- if not $secContext.capabilities.disableS6Caps -}}
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{{- $addCap = mustAppend $addCap "CHOWN" -}}
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{{- $addCap = mustAppend $addCap "SETUID" -}}
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{{- $addCap = mustAppend $addCap "SETGID" -}}
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{{- $addCap = mustAppend $addCap "FOWNER" -}}
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{{- $addCap = mustAppend $addCap "DAC_OVERRIDE" -}}
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{{- end -}}
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{{- $_ := set $secContext.capabilities "add" $addCap -}}
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{{- end -}}
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{{- range $key := (list "add" "drop") -}}
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{{- $item := (get $secContext.capabilities $key) -}}
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{{- if not (kindIs "slice" $item) -}}
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{{- fail (printf "Container - Expected <securityContext.capabilities.%s> to be [list], but got [%s]" $key (kindOf $item)) -}}
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{{- end -}}
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{{- range $item -}}
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{{- if not (kindIs "string" .) -}}
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{{- fail (printf "Container - Expected items of <securityContext.capabilities.%s> to be [string], but got [%s]" $key (kindOf .)) -}}
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{{- end -}}
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{{- end -}}
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{{- if not (deepEqual (uniq $item) $item) -}}
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{{- fail (printf "Container - Expected items of <securityContext.capabilities.%s> to be unique, but got [%s]" $key (join ", " $item)) -}}
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{{- end -}}
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{{- end -}}
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{{- $secContext | toJson -}}
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{{- end -}}
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