open-nomad/.semgrep/rpc_endpoint.yml

rules:
  # Check potentially unauthenticated RPC endpoints. Technically more
  # authorization (authz) oriented than authn, but before Nomad 1.4/1.5 that
  # distinction wasn't as important.
  - id: "rpc-potentially-unauthenticated"
    patterns:
      - pattern: |
          if done, err := $A.$B.forward($METHOD, ...); done {
            return err
          }
      # Pattern used by typical endpoints that take an auth token or workload
      # identity. Some of these endpoints have no context for Authenticate
      - pattern-not-inside: |
          authErr := $A.$B.Authenticate(...)
          ...
          if done, err := $A.$B.forward($METHOD, ...); done {
            return err
          }
          ...
          ... := $A.$B.ResolveACL(...)
          ...
      # Pattern used by endpoints that are used by both ACLs and Clients.
      # These endpoints will always have a ctx passed to Authenticate
      - pattern-not-inside: |
          authErr := $A.$B.Authenticate($A.ctx, args)
          ...
          if done, err := $A.$B.forward($METHOD, ...); done {
            return err
          }
          ...
          ... := $A.$B.ResolveClientOrACL(...)
          ...
      # Pattern used by ACL endpoints that need to interact with the token directly
      - pattern-not-inside: |
          authErr := $A.$B.Authenticate($A.ctx, args)
          ...
          if done, err := $A.$B.forward($METHOD, ...); done {
            return err
          }
          ...
          ... := args.GetIdentity().GetACLToken()
          ...
      # Pattern used by endpoints called exclusively between agents
      # (server -> server or client -> server)
      - pattern-not-inside: |
          authErr := $A.$B.Authenticate($A.ctx, args)
          ...
          ... := validateTLSCertificateLevel(...)
          ...
          if done, err := $A.$B.forward($METHOD, ...); done {
            return err
          }
      # Pattern used by endpoints that support both normal ACLs and workload
      # identity but break authentication and authorization up
      # TODO: currently this is just for Variables and should be removed once
      # https://github.com/hashicorp/nomad/issues/15875 is complete.
      - pattern-not-inside: |
          authErr := $A.$B.Authenticate($A.ctx, args)
          ...
          if done, err := $A.$B.forward($METHOD, ...); done {
            return err
          }
          ...
          ... := $T.handleMixedAuthEndpoint(...)
          ...
      # Second pattern used by endpoints that support both normal ACLs and
      # workload identity but break authentication and authorization up
      # TODO: currently this is just for Variables and should be removed once
      # https://github.com/hashicorp/nomad/issues/15875 is complete.
      - pattern-not-inside: |
          authErr := $A.$B.Authenticate($A.ctx, args)
          ...
          if done, err := $A.$B.forward($METHOD, ...); done {
            return err
          }
          ...
          ... := svePreApply($A, args, args.Var)
          ...
      # Pattern used by some Node endpoints.
      - pattern-not-inside: |
          authErr := $A.$B.Authenticate($A.ctx, args)
          ...
          if done, err := $A.$B.forward($METHOD, ...); done {
            return err
          }
          ...
          return $A.deregister(...)
          ...
      - metavariable-pattern:
          metavariable: $METHOD
          patterns:
            # Endpoints that are expected not to have authentication.
            - pattern-not: '"ACL.Bootstrap"'
            - pattern-not: '"ACL.GetClaimPolicies"'
            - pattern-not: '"ACL.ResolveToken"'
            - pattern-not: '"ACL.UpsertOneTimeToken"'
            - pattern-not: '"ACL.ExchangeOneTimeToken"'
            - pattern-not: '"ACL.WhoAmI"'
            - pattern-not: 'structs.ACLListAuthMethodsRPCMethod'
            - pattern-not: 'structs.ACLOIDCAuthURLRPCMethod'
            - pattern-not: 'structs.ACLOIDCCompleteAuthRPCMethod'
            - pattern-not: 'structs.ACLLoginRPCMethod'
            - pattern-not: '"CSIPlugin.Get"'
            - pattern-not: '"CSIPlugin.List"'
            - pattern-not: '"Status.Leader"'
            - pattern-not: '"Status.Peers"'
            - pattern-not: '"Status.Version"'
    message: "RPC method $METHOD appears to be unauthenticated"
    languages:
      - "go"
    severity: "WARNING"
    paths:
      include:
        - "nomad/*_endpoint.go"