Responding By Component

OSCAL SSPs represent control responses in control-implementation / implemented-requirements / statements.

See Control Implementation Statements to understand how to associate control responses with specific baseline controls and control statements.

Within statements, all responses must be assocaited with one or more components via the by-components array.

OSCAL enables you to be as granular as you wish. Individual components may be added for operating systems, container images, firewalls, policies, procedures and plans. There is always a "this-system" component representing the entire system / authorization-boundary.

responses occur within by-components / description. In a legacy Word-based SSP, it was often necessary to provide narriative for each relevant component in a control response. The entire narriative for all components was captured in a single table cell as separate paragraphs.

With OSCAL, you have the option of keeping a single narriative block, or breaking out a control response by its discrete components.

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Retrofit Adoption Path MVP

When converting a Word-based FedRAMP SSP to OSCAL, move all control responses to the this-system component.

Every OSCAL SSP must have a this-system component defined. It is the only required component.

system-security-plan:
  system-implementation:
    components:
    - uuid: 11111111-2222-4000-8000-009000000000
      type: this-system
      title: This System
      description: 'Represents the entire authorization boundary'
      status:
        state: operational

Every statements / by-components array has exactly one entry that references the this-system component and includes the content from the Word-based SSP.

Each statements array entry includes:

• a required uuid field
• a required by-components array. Each array entry includes:
  • a required component-uuid field that cites the this-sytem component from above.
  • a required uuid field
  • a required description field that contains the content from the Word-based SSP control response.
  • a required implementation-status element with:
    • a required state field with a value of of implemented.

system-security-plan:
  control-implementation:
    description: n/a.
    implemented-requirements:
    - uuid: 11111111-2222-4000-8000-012000010000
      control-id: ac-1
      statements:
      - statement-id: ac-1_smt.a
        uuid: 11111111-2222-4000-8000-012000010100
        by-components:
        - component-uuid: 11111111-2222-4000-8000-009000000000
          uuid: 11111111-2222-4000-8000-012000010101
          description: Word-based SSP AC-1, statement a response.
          implementation-status:
            state: implemented
      - statement-id: ac-1_smt.b
        uuid: 11111111-2222-4000-8000-012000010200
        by-components:
        - component-uuid: 11111111-2222-4000-8000-009000000000
          uuid: 11111111-2222-4000-8000-012000010201
          description: Word-based SSP AC-1, statement b response.
      - statement-id: ac-1_smt.c
        uuid: 11111111-2222-4000-8000-012000010300
        by-components:
        - component-uuid: 11111111-2222-4000-8000-009000000000
          uuid: 11111111-2222-4000-8000-012000010301
          description: Word-based SSP AC-1, statement c response.
          implementation-status:
            state: implemented

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Native Adoption Path

When creating an SSP from scratch, ensure appropriate components are defined before authoring a control response. The this-system component must always be present. Other components are present baed on their use within the sytem. See Components for more information.

system-security-plan:
  system-implementation:
    components:
    - uuid: 11111111-2222-4000-8000-009000000000
      type: this-system
      title: This System
      description: 'Represents the entire authorization boundary'
      status:
        state: operational

    - uuid: 11111111-2222-4000-8000-009000500001
      type: service
      title: Service A
      description: 'An authorized service from a leveraged CSO.'
      status:
        state: operational
        
    - uuid: 11111111-2222-4000-8000-009000600001
      type: policy
      title: Access Control and Identity Management Policy
      description: 'A corporate policy used for the system.'
      status:
        state: operational

Every statements / by-components array has one or more entries that reference components describes how that component is satisfying that control requirement statement.

Each statements array entry includes:

• a required uuid field
• a required by-components array. Each array entry includes:
  • a required component-uuid field that cites the appropriate component from above.
  • a required uuid field
  • a required description field that contains the content from the Word-based SSP control response.
  • a required implementation-status element with:
    • a required state field with a value of of implemented.

system-security-plan:
  control-implementation:
    description: n/a.
    implemented-requirements:
    - uuid: 11111111-2222-4000-8000-012000010000
      control-id: ac-1
      statements:
      - statement-id: ac-1_smt.a
        uuid: 11111111-2222-4000-8000-012000010100
        by-components:

        - component-uuid: 11111111-2222-4000-8000-009000600001
          uuid: 11111111-2222-4000-8000-012000010102
          description: Describe how this policy satisfies part a.
          implementation-status:
            state: implemented        

        - component-uuid: 11111111-2222-4000-8000-009000000000
          uuid: 11111111-2222-4000-8000-012000010101
          description: Provide general context about satisfying part a that doesn't fit a defined component.
          implementation-status:
            state: implemented

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