CAPEC-131: Resource Leak Exposure

An adversary utilizes a resource leak on the target to deplete the quantity of the resource available to service legitimate requests.

Comment

Kinda like CAPEC-130, but an attacker takes advantage of a leak that you have.

Medium

Severity

occurrences in scenarios

Frequency

Affected Components

Affected Scenarios

Requirements and Mitigations

Requirements

Component properties that must be true for this threat to apply:

Mitigations

Component properties that mitigate this threat:

Affected Components

Component	Description	Boundary
DZ App	Primary DZ application and interface, executed on the host machine	Local host
doc_to_pixels.py	Reads a suspicious documents and converts it to pixels	gVisor sandbox
Cosign Binary (build machines)	Cosign binary running on the build machine	FPF-operated Tailnet
LibreOffice	Converts documents to PDFs	gVisor sandbox

Affected Scenarios

convert — affects: DZ App doc_to_pixels.py LibreOffice

digraph tm {
    graph [
        fontname = Arial;
        fontsize = 14;
    ]
    node [
        fontname = Arial;
        fontsize = 14;
    ]
    edge [
        fontname = Arial;
        fontsize = 12;
    ]
    nodesep = 1;

    subgraph cluster_boundary_Internet {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Internet>;
        ]

        externalentity_Random_doc_source_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "Random doc\nsource";
            URL = "component_Random_doc_source.html";
            tooltip = "Random doc source";
            margin = 0.02;
        ]

    }

    subgraph cluster_boundary_Local_host {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Local host>;
        ]

        subgraph cluster_boundary_Docker_Podman_VM {
            graph [
                fontsize = 10;
                fontcolor = black;
                style = dashed;
                color = firebrick2;
                label = <Docker/Podman VM>;
            ]

            subgraph cluster_boundary_Outer_container {
                graph [
                    fontsize = 10;
                    fontcolor = black;
                    style = dashed;
                    color = firebrick2;
                    label = <Outer container>;
                ]

                subgraph cluster_boundary_gVisor_sandbox {
                    graph [
                        fontsize = 10;
                        fontcolor = black;
                        style = dashed;
                        color = firebrick2;
                        label = <gVisor sandbox>;
                    ]

                    component_LibreOffice_gVisor_sandbox [
                        shape = circle;
                        color = black;
                        fontcolor = black;
                        label = "LibreOffice";
                        URL = "component_LibreOffice.html";
                        tooltip = "LibreOffice";
                        margin = 0.02;

                        style = "filled";

                        fillcolor = "#c0392b";

                        fontcolor = "white";

                        class = "highlighted";
                    ]

                    component_doc_to_pixels_py_gVisor_sandbox [
                        shape = circle;
                        color = black;
                        fontcolor = black;
                        label = "doc_to_pixels.py";
                        URL = "component_doc_to_pixels_py.html";
                        tooltip = "doc_to_pixels.py";
                        margin = 0.02;

                        style = "filled";

                        fillcolor = "#c0392b";

                        fontcolor = "white";

                        class = "highlighted";
                    ]

                }

                component_entrypoint_py_Outer_container [
                    shape = circle;
                    color = black;
                    fontcolor = black;
                    label = "entrypoint.py";
                    URL = "component_entrypoint_py.html";
                    tooltip = "entrypoint.py";
                    margin = 0.02;
                ]

            }

            component_Container_runtime_Docker_Podman_VM [
                shape = circle;
                color = black;
                fontcolor = black;
                label = "Container\nruntime";
                URL = "component_Container_runtime.html";
                tooltip = "Container runtime";
                margin = 0.02;
            ]

        }

        component_Container_manager_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "Container\nmanager";
            URL = "component_Container_manager.html";
            tooltip = "Container manager";
            margin = 0.02;
        ]

        component_DZ_App_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "DZ App";
            URL = "component_DZ_App.html";
            tooltip = "DZ App";
            margin = 0.02;

            style = "filled";

            fillcolor = "#c0392b";

            fontcolor = "white";

            class = "highlighted";
        ]

        datastore_Host_storage_Local_host [
            shape = cylinder;
            color = black;
            fontcolor = black;
            label = "Host storage";
            URL = "component_Host_storage.html";
            tooltip = "Host storage";
            margin = 0.02;
        ]

        component_PDF_reader_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "PDF reader";
            URL = "component_PDF_reader.html";
            tooltip = "PDF reader";
            margin = 0.02;
        ]

        actor_User_Local_host [
            shape = square;
            color = black;
            fontcolor = black;
            label = "User";
            URL = "component_User.html";
            tooltip = "User";
            margin = 0.02;
        ]

    }

    actor_User_Local_host -> externalentity_Random_doc_source_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "1. Request untrusted\ndoc from remote\nsource";    ]
    externalentity_Random_doc_source_Internet -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "2. Receive untrusted\ndoc from remote\nsource and store it\nlocally";    ]
    actor_User_Local_host -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "3. Start the\nDangerzone App";    ]
    component_DZ_App_Local_host -> component_Container_manager_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "4. Invoke\nDocker/Podman to\ncheck if the\ncontainer image is\npresent and\ninstalled";    ]
    component_Container_manager_Local_host -> component_Container_runtime_Docker_Podman_VM [        color = black;        fontcolor = black;        dir = forward;        label = "5. Is the image\npresent in the VM?";    ]
    component_Container_runtime_Docker_Podman_VM -> component_Container_manager_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "6. Image is present";    ]
    component_Container_manager_Local_host -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "7. Reply to\nDangerzone APP that\nthe container image\nis installed";    ]
    actor_User_Local_host -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "8. Select documents\nfor conversion";    ]
    component_DZ_App_Local_host -> component_Container_manager_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "9. Request a Linux\ncontainer for\nconversion";    ]
    component_Container_manager_Local_host -> component_Container_runtime_Docker_Podman_VM [        color = black;        fontcolor = black;        dir = forward;        label = "10. Start a Linux\ncontainer";    ]
    component_Container_runtime_Docker_Podman_VM -> component_entrypoint_py_Outer_container [        color = black;        fontcolor = black;        dir = forward;        label = "11. Run entrypoint\nscript of Linux\ncontainer";    ]
    component_entrypoint_py_Outer_container -> component_doc_to_pixels_py_gVisor_sandbox [        color = black;        fontcolor = black;        dir = forward;        label = "12. Start the\nDangerzone converter\nin the gVisor\nsandbox";    ]
    component_DZ_App_Local_host -> component_doc_to_pixels_py_gVisor_sandbox [        color = black;        fontcolor = black;        dir = forward;        label = "13. Send the\nsuspicious document\nto the stdin of the\ngVisor sandbox";    ]
    component_doc_to_pixels_py_gVisor_sandbox -> component_LibreOffice_gVisor_sandbox [        color = black;        fontcolor = black;        dir = forward;        label = "14. Convert the\nsuspicious doc to\nPDF (if not already)";    ]
    component_LibreOffice_gVisor_sandbox -> component_doc_to_pixels_py_gVisor_sandbox [        color = black;        fontcolor = black;        dir = forward;        label = "15. Receive\nsuspicious doc as\nPDF";    ]
    component_doc_to_pixels_py_gVisor_sandbox -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "16. Rasterize PDF\ninto pixels and\nwrite them to the\ngVisor sandbox's\nstdout";    ]
    component_DZ_App_Local_host -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "17. Reconstruct a\nsafe doc from pixels\nto PDF (and\noptionally OCR it)";    ]
    component_DZ_App_Local_host -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "18. Save safe PDF\nwith a '-safe.pdf'\nprefix";    ]
    component_DZ_App_Local_host -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "19. Archive the\nsuspicious PDF into\nthe 'unsafe/'\ndirectory";    ]
    component_DZ_App_Local_host -> component_PDF_reader_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "20. Open the PDF\nusing the program of\nthe user's choice,\nor the default one";    ]
}

convert_basic — affects: DZ App doc_to_pixels.py

digraph tm {
    graph [
        fontname = Arial;
        fontsize = 14;
    ]
    node [
        fontname = Arial;
        fontsize = 14;
    ]
    edge [
        fontname = Arial;
        fontsize = 12;
    ]
    nodesep = 1;

    subgraph cluster_boundary_Local_host {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Local host>;
        ]

        subgraph cluster_boundary_Docker_Podman_VM {
            graph [
                fontsize = 10;
                fontcolor = black;
                style = dashed;
                color = firebrick2;
                label = <Docker/Podman VM>;
            ]

            subgraph cluster_boundary_Outer_container {
                graph [
                    fontsize = 10;
                    fontcolor = black;
                    style = dashed;
                    color = firebrick2;
                    label = <Outer container>;
                ]

                subgraph cluster_boundary_gVisor_sandbox {
                    graph [
                        fontsize = 10;
                        fontcolor = black;
                        style = dashed;
                        color = firebrick2;
                        label = <gVisor sandbox>;
                    ]

                    component_doc_to_pixels_py_gVisor_sandbox [
                        shape = circle;
                        color = black;
                        fontcolor = black;
                        label = "doc_to_pixels.py";
                        URL = "component_doc_to_pixels_py.html";
                        tooltip = "doc_to_pixels.py";
                        margin = 0.02;

                        style = "filled";

                        fillcolor = "#c0392b";

                        fontcolor = "white";

                        class = "highlighted";
                    ]

                }

            }

        }

        component_DZ_App_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "DZ App";
            URL = "component_DZ_App.html";
            tooltip = "DZ App";
            margin = 0.02;

            style = "filled";

            fillcolor = "#c0392b";

            fontcolor = "white";

            class = "highlighted";
        ]

        datastore_Host_storage_Local_host [
            shape = cylinder;
            color = black;
            fontcolor = black;
            label = "Host storage";
            URL = "component_Host_storage.html";
            tooltip = "Host storage";
            margin = 0.02;
        ]

        actor_User_Local_host [
            shape = square;
            color = black;
            fontcolor = black;
            label = "User";
            URL = "component_User.html";
            tooltip = "User";
            margin = 0.02;
        ]

    }

    actor_User_Local_host -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "1. Start the\nDangerzone App";    ]
    actor_User_Local_host -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "2. Select documents\nfor conversion";    ]
    component_DZ_App_Local_host -> component_doc_to_pixels_py_gVisor_sandbox [        color = black;        fontcolor = black;        dir = forward;        label = "3. Send the\nsuspicious document\nto the stdin of the\ngVisor sandbox";    ]
    component_doc_to_pixels_py_gVisor_sandbox -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "4. Rasterize PDF\ninto pixels and\nwrite them to the\ngVisor sandbox's\nstdout";    ]
    component_DZ_App_Local_host -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "5. Reconstruct a\nsafe doc from pixels\nto PDF (and\noptionally OCR it)";    ]
    component_DZ_App_Local_host -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "6. Save safe PDF\nwith a '-safe.pdf'\nprefix";    ]
}

release_sandbox — affects: Cosign Binary (build machines)

digraph tm {
    graph [
        fontname = Arial;
        fontsize = 14;
    ]
    node [
        fontname = Arial;
        fontsize = 14;
    ]
    edge [
        fontname = Arial;
        fontsize = 12;
    ]
    nodesep = 1;

    subgraph cluster_boundary_FPF_operated_Tailnet {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <FPF-operated Tailnet>;
        ]

        server_Build_machines_FPF_operated_Tailnet [
            shape = box;
            color = black;
            fontcolor = black;
            label = "Build machines";
            URL = "component_Build_machines.html";
            tooltip = "Build machines";
            margin = 0.02;
        ]

        component_Cosign_Binary__build_machines__FPF_operated_Tailnet [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "Cosign Binary\n(build machines)";
            URL = "component_Cosign_Binary__build_machines_.html";
            tooltip = "Cosign Binary (build machines)";
            margin = 0.02;

            style = "filled";

            fillcolor = "#c0392b";

            fontcolor = "white";

            class = "highlighted";
        ]

    }

    subgraph cluster_boundary_Internet {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Internet>;
        ]

        externalentity_GitHub_Container_Registry_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "GitHub Container\nRegistry";
            URL = "component_GitHub_Container_Registry.html";
            tooltip = "GitHub Container Registry";
            margin = 0.02;
        ]

        externalentity_Rekor_Log_Server_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "Rekor Log Server";
            URL = "component_Rekor_Log_Server.html";
            tooltip = "Rekor Log Server";
            margin = 0.02;
        ]

    }

    server_Build_machines_FPF_operated_Tailnet -> externalentity_GitHub_Container_Registry_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "1. Build container\nimage";    ]
    server_Build_machines_FPF_operated_Tailnet -> externalentity_GitHub_Container_Registry_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "2. Push container to\nGHCR";    ]
    component_Cosign_Binary__build_machines__FPF_operated_Tailnet -> externalentity_GitHub_Container_Registry_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "3. Sign remote\nsandbox image";    ]
    component_Cosign_Binary__build_machines__FPF_operated_Tailnet -> externalentity_Rekor_Log_Server_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "4. Publish rekor\nlogs";    ]
    server_Build_machines_FPF_operated_Tailnet -> externalentity_GitHub_Container_Registry_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "5. Request signed\nsandbox tarball";    ]
    externalentity_GitHub_Container_Registry_Internet -> server_Build_machines_FPF_operated_Tailnet [        color = black;        fontcolor = black;        dir = forward;        label = "6. Response with the\nsigned sandbox +\nsignatures";    ]
    server_Build_machines_FPF_operated_Tailnet -> component_Cosign_Binary__build_machines__FPF_operated_Tailnet [        color = black;        fontcolor = black;        dir = forward;        label = "7. Generate the\nsandbox tarball from\nthe pulled container\nimage";    ]
    server_Build_machines_FPF_operated_Tailnet -> externalentity_GitHub_Container_Registry_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "8. Tag remote\nsandbox";    ]
}

update — affects: DZ App

digraph tm {
    graph [
        fontname = Arial;
        fontsize = 14;
    ]
    node [
        fontname = Arial;
        fontsize = 14;
    ]
    edge [
        fontname = Arial;
        fontsize = 12;
    ]
    nodesep = 1;

    subgraph cluster_boundary_Internet {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Internet>;
        ]

        externalentity_DZ_GitHub_repo_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "DZ GitHub repo";
            URL = "component_DZ_GitHub_repo.html";
            tooltip = "DZ GitHub repo";
            margin = 0.02;
        ]

        server_DZ_Linux_package_server_Internet [
            shape = box;
            color = black;
            fontcolor = black;
            label = "DZ Linux package\nserver";
            URL = "component_DZ_Linux_package_server.html";
            tooltip = "DZ Linux package server";
            margin = 0.02;
        ]

        externalentity_GitHub_release_server_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "GitHub release\nserver";
            URL = "component_GitHub_release_server.html";
            tooltip = "GitHub release server";
            margin = 0.02;
        ]

        server_dangerzone_rocks_Internet [
            shape = box;
            color = black;
            fontcolor = black;
            label = "dangerzone.rocks";
            URL = "component_dangerzone_rocks.html";
            tooltip = "dangerzone.rocks";
            margin = 0.02;
        ]

    }

    subgraph cluster_boundary_Local_host {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Local host>;
        ]

        component_DZ_App_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "DZ App";
            URL = "component_DZ_App.html";
            tooltip = "DZ App";
            margin = 0.02;

            style = "filled";

            fillcolor = "#c0392b";

            fontcolor = "white";

            class = "highlighted";
        ]

        datastore_Host_storage_Local_host [
            shape = cylinder;
            color = black;
            fontcolor = black;
            label = "Host storage";
            URL = "component_Host_storage.html";
            tooltip = "Host storage";
            margin = 0.02;
        ]

        actor_User_Local_host [
            shape = square;
            color = black;
            fontcolor = black;
            label = "User";
            URL = "component_User.html";
            tooltip = "User";
            margin = 0.02;
        ]

    }

    component_DZ_App_Local_host -> externalentity_DZ_GitHub_repo_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "1. Check for newer\nreleases";    ]
    externalentity_DZ_GitHub_repo_Internet -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "2. Send changelog\nfor new release and\nprompt user to\ninstall";    ]
    actor_User_Local_host -> server_dangerzone_rocks_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "3. Check\ndangerzone.rocks for\nlatest install";    ]
    server_dangerzone_rocks_Internet -> externalentity_DZ_GitHub_repo_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "4. (Linux) Redirect\nto installation docs";    ]
    actor_User_Local_host -> server_DZ_Linux_package_server_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "5. (Linux) Request\nbinary/image";    ]
    server_DZ_Linux_package_server_Internet -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "6. (Linux) Receive\nbinary/image";    ]
    server_dangerzone_rocks_Internet -> externalentity_GitHub_release_server_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "7. (Win / macOS)\nRedirects to GH\nrelease page\nbinaries";    ]
    server_dangerzone_rocks_Internet -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "8. (Win / macOS)\nReceive install\nbinary";    ]
}

update_linux — affects: DZ App

digraph tm {
    graph [
        fontname = Arial;
        fontsize = 14;
    ]
    node [
        fontname = Arial;
        fontsize = 14;
    ]
    edge [
        fontname = Arial;
        fontsize = 12;
    ]
    nodesep = 1;

    subgraph cluster_boundary_Internet {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Internet>;
        ]

        externalentity_DZ_GitHub_repo_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "DZ GitHub repo";
            URL = "component_DZ_GitHub_repo.html";
            tooltip = "DZ GitHub repo";
            margin = 0.02;
        ]

        server_DZ_Linux_package_server_Internet [
            shape = box;
            color = black;
            fontcolor = black;
            label = "DZ Linux package\nserver";
            URL = "component_DZ_Linux_package_server.html";
            tooltip = "DZ Linux package server";
            margin = 0.02;
        ]

        server_dangerzone_rocks_Internet [
            shape = box;
            color = black;
            fontcolor = black;
            label = "dangerzone.rocks";
            URL = "component_dangerzone_rocks.html";
            tooltip = "dangerzone.rocks";
            margin = 0.02;
        ]

    }

    subgraph cluster_boundary_Local_host {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Local host>;
        ]

        component_DZ_App_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "DZ App";
            URL = "component_DZ_App.html";
            tooltip = "DZ App";
            margin = 0.02;

            style = "filled";

            fillcolor = "#c0392b";

            fontcolor = "white";

            class = "highlighted";
        ]

        datastore_Host_storage_Local_host [
            shape = cylinder;
            color = black;
            fontcolor = black;
            label = "Host storage";
            URL = "component_Host_storage.html";
            tooltip = "Host storage";
            margin = 0.02;
        ]

        actor_User_Local_host [
            shape = square;
            color = black;
            fontcolor = black;
            label = "User";
            URL = "component_User.html";
            tooltip = "User";
            margin = 0.02;
        ]

    }

    component_DZ_App_Local_host -> externalentity_DZ_GitHub_repo_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "1. Check for newer\nreleases";    ]
    externalentity_DZ_GitHub_repo_Internet -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "2. Send changelog\nfor new release and\nprompt user to\ninstall";    ]
    actor_User_Local_host -> server_dangerzone_rocks_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "3. Check\ndangerzone.rocks for\nlatest install";    ]
    server_dangerzone_rocks_Internet -> externalentity_DZ_GitHub_repo_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "4. (Linux) Redirect\nto installation docs";    ]
    actor_User_Local_host -> server_DZ_Linux_package_server_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "5. (Linux) Request\nbinary/image";    ]
    server_DZ_Linux_package_server_Internet -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "6. (Linux) Receive\nbinary/image";    ]
}

update_windows — affects: DZ App

digraph tm {
    graph [
        fontname = Arial;
        fontsize = 14;
    ]
    node [
        fontname = Arial;
        fontsize = 14;
    ]
    edge [
        fontname = Arial;
        fontsize = 12;
    ]
    nodesep = 1;

    subgraph cluster_boundary_Internet {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Internet>;
        ]

        externalentity_DZ_GitHub_repo_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "DZ GitHub repo";
            URL = "component_DZ_GitHub_repo.html";
            tooltip = "DZ GitHub repo";
            margin = 0.02;
        ]

        externalentity_GitHub_release_server_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "GitHub release\nserver";
            URL = "component_GitHub_release_server.html";
            tooltip = "GitHub release server";
            margin = 0.02;
        ]

        server_dangerzone_rocks_Internet [
            shape = box;
            color = black;
            fontcolor = black;
            label = "dangerzone.rocks";
            URL = "component_dangerzone_rocks.html";
            tooltip = "dangerzone.rocks";
            margin = 0.02;
        ]

    }

    subgraph cluster_boundary_Local_host {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Local host>;
        ]

        component_DZ_App_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "DZ App";
            URL = "component_DZ_App.html";
            tooltip = "DZ App";
            margin = 0.02;

            style = "filled";

            fillcolor = "#c0392b";

            fontcolor = "white";

            class = "highlighted";
        ]

        datastore_Host_storage_Local_host [
            shape = cylinder;
            color = black;
            fontcolor = black;
            label = "Host storage";
            URL = "component_Host_storage.html";
            tooltip = "Host storage";
            margin = 0.02;
        ]

        actor_User_Local_host [
            shape = square;
            color = black;
            fontcolor = black;
            label = "User";
            URL = "component_User.html";
            tooltip = "User";
            margin = 0.02;
        ]

    }

    component_DZ_App_Local_host -> externalentity_DZ_GitHub_repo_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "1. Check for newer\nreleases";    ]
    externalentity_DZ_GitHub_repo_Internet -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "2. Send changelog\nfor new release and\nprompt user to\ninstall";    ]
    actor_User_Local_host -> server_dangerzone_rocks_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "3. Check\ndangerzone.rocks for\nlatest install";    ]
    server_dangerzone_rocks_Internet -> externalentity_GitHub_release_server_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "4. (Win / macOS)\nRedirects to GH\nrelease page\nbinaries";    ]
    server_dangerzone_rocks_Internet -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "5. (Win / macOS)\nReceive install\nbinary";    ]
}

upgrade_sandbox — affects: DZ App

digraph tm {
    graph [
        fontname = Arial;
        fontsize = 14;
    ]
    node [
        fontname = Arial;
        fontsize = 14;
    ]
    edge [
        fontname = Arial;
        fontsize = 12;
    ]
    nodesep = 1;

    subgraph cluster_boundary_Internet {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Internet>;
        ]

        externalentity_GitHub_Container_Registry_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "GitHub Container\nRegistry";
            URL = "component_GitHub_Container_Registry.html";
            tooltip = "GitHub Container Registry";
            margin = 0.02;
        ]

        externalentity_Rekor_Log_Server_Internet [
            shape = square;
            color = black;
            fontcolor = black;
            label = "Rekor Log Server";
            URL = "component_Rekor_Log_Server.html";
            tooltip = "Rekor Log Server";
            margin = 0.02;
        ]

    }

    subgraph cluster_boundary_Local_host {
        graph [
            fontsize = 10;
            fontcolor = black;
            style = dashed;
            color = firebrick2;
            label = <Local host>;
        ]

        component_Container_manager_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "Container\nmanager";
            URL = "component_Container_manager.html";
            tooltip = "Container manager";
            margin = 0.02;
        ]

        component_Cosign_Binary__embedded__Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "Cosign Binary\n(embedded)";
            URL = "component_Cosign_Binary__embedded_.html";
            tooltip = "Cosign Binary (embedded)";
            margin = 0.02;
        ]

        component_DZ_App_Local_host [
            shape = circle;
            color = black;
            fontcolor = black;
            label = "DZ App";
            URL = "component_DZ_App.html";
            tooltip = "DZ App";
            margin = 0.02;

            style = "filled";

            fillcolor = "#c0392b";

            fontcolor = "white";

            class = "highlighted";
        ]

        datastore_Host_storage_Local_host [
            shape = cylinder;
            color = black;
            fontcolor = black;
            label = "Host storage";
            URL = "component_Host_storage.html";
            tooltip = "Host storage";
            margin = 0.02;
        ]

        actor_User_Local_host [
            shape = square;
            color = black;
            fontcolor = black;
            label = "User";
            URL = "component_User.html";
            tooltip = "User";
            margin = 0.02;
        ]

    }

    component_DZ_App_Local_host -> actor_User_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "1. Should enable\nsandbox updates?";    ]
    actor_User_Local_host -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "2. User consent";    ]
    component_DZ_App_Local_host -> externalentity_GitHub_Container_Registry_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "3. Query registry";    ]
    externalentity_GitHub_Container_Registry_Internet -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "4. Registry response";    ]
    component_DZ_App_Local_host -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "5. Store remote log\nindex";    ]
    datastore_Host_storage_Local_host -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "6. Read current log\nindex";    ]
    component_DZ_App_Local_host -> component_Container_manager_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "7. Pull sandbox\nimage";    ]
    component_DZ_App_Local_host -> component_Cosign_Binary__embedded__Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "8. Verify sandbox\nsignatures";    ]
    component_Cosign_Binary__embedded__Local_host -> externalentity_Rekor_Log_Server_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "9. Verify rekor log";    ]
    component_Cosign_Binary__embedded__Local_host -> component_DZ_App_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "10. Signature\nverification result";    ]
    component_DZ_App_Local_host -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "11. Store signatures";    ]
    component_Container_manager_Local_host -> datastore_Host_storage_Local_host [        color = black;        fontcolor = black;        dir = forward;        label = "12. Install sandbox";    ]
    component_Container_manager_Local_host -> externalentity_GitHub_Container_Registry_Internet [        color = black;        fontcolor = black;        dir = forward;        label = "13. Pull sandbox\nimage";    ]
}

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