99 lines
2.9 KiB
Rego
99 lines
2.9 KiB
Rego
# METADATA
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# title: Data source policy for ds:expense-db-app
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# description: |
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# Governs which agents may read which resources in whose name on the
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# own DB-app data source. Requires an active user session for all
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# current reads (requires_user_context=TRUE for every registered
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# agent_data_source_scope).
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# authors:
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# - CTO Agent <cto@basicstack.de>
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# related_resources:
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# - ref: docs/architecture/v1.1.md#user-content-3b-data-source-registry
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# - ref: docs/architecture/v1.1.md#user-content-3c-session-scope-tokens--delegation-agent-im-auftrag-von-benutzer
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package proofedmesh.data_sources.expense_db_app
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import rego.v1
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default allow := false
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allow if {
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input.data_source == "ds:expense-db-app"
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input.operation == "read"
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input.user_sub != ""
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input.session_id != ""
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some rule in agent_scope_rules
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rule.agent_id == input.agent_id
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rule.resource == input.resource
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filters_within_scope(rule)
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user_bound_filters_ok(rule)
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}
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# Rule table: who may read what, with which filter dimensions and user-binding mode.
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agent_scope_rules := [
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{
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"agent_id": "agent-travel",
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"resource": "project_assignments",
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"allowed_filters": {"employee_id", "active_on"},
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"required_filters": {"employee_id"},
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"require_own_employee": true,
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},
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{
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"agent_id": "agent-sink-mapping",
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"resource": "account_assignments",
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"allowed_filters": {"project_code", "cost_center"},
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"required_filters": {"project_code"},
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"require_own_employee": false,
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},
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{
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"agent_id": "agent-sink-mapping",
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"resource": "cost_centers",
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"allowed_filters": {"active"},
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"required_filters": set(),
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"require_own_employee": false,
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},
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]
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# Only the declared filter keys are allowed; required filters must be present.
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filters_within_scope(rule) if {
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provided := {k | some k; _ := input.filters[k]}
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count(provided - rule.allowed_filters) == 0
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count(rule.required_filters - provided) == 0
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}
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# When require_own_employee=true, the employee_id filter must map to input.user_sub.
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# The mapping is loaded as external data: data.employee_mapping.by_sub[user_sub] -> "EMP-...".
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user_bound_filters_ok(rule) if {
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not rule.require_own_employee
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}
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user_bound_filters_ok(rule) if {
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rule.require_own_employee
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expected := data.employee_mapping.by_sub[input.user_sub]
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input.filters.employee_id == expected
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}
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deny_reason contains msg if {
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input.data_source != "ds:expense-db-app"
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msg := sprintf("wrong data_source: %s", [input.data_source])
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}
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deny_reason contains msg if {
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input.operation != "read"
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msg := sprintf("operation %s not supported", [input.operation])
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}
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deny_reason contains msg if {
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input.user_sub == ""
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msg := "missing user_sub (requires_user_context=true for all registered scopes)"
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}
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deny_reason contains msg if {
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not any_scope_rule_matches
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msg := sprintf("no scope rule for agent=%s resource=%s", [input.agent_id, input.resource])
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}
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any_scope_rule_matches if {
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some rule in agent_scope_rules
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rule.agent_id == input.agent_id
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rule.resource == input.resource
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}
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