@aws/pdk
Version:
All documentation is located at: https://aws.github.io/aws-pdk
166 lines • 26 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ThreatModelGenerator = void 0;
/*! Copyright [Amazon.com](http://amazon.com/), Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0 */
const pdk_nag_1 = require("../../pdk-nag");
const lodash_1 = require("lodash");
const BASE_THREAT_MODEL = require("./base-model/threat-composer-base-model.tc.json");
// Mitigation content is the CDK Nag rule name.
const NAG_RULE_MITIGATION_PREFIX = "cdk-nag rule: ";
/**
* Generates Threat Composer threat models based on CDK Nag results
*/
class ThreatModelGenerator {
constructor() {
/**
* Given a Threat Composer mitigation, return the CDK Nag rule associated (if any)
*/
this.getRuleFromMitigation = (mitigation) => {
if (mitigation?.content.startsWith(NAG_RULE_MITIGATION_PREFIX)) {
return mitigation.content.split(NAG_RULE_MITIGATION_PREFIX)[1];
}
return undefined;
};
/**
* Deduplicate suppression reasons, removing resource details if present
*/
this.prettySuppressions = (suppressions) => {
return (0, lodash_1.uniq)(suppressions.map((s) => s.startsWith("[") ? s.slice(s.indexOf("] ") + 2) : s));
};
}
/**
* Generate a threat model from a set of cdk nag results
*/
generate(results, options) {
// Summarise nag results into rules and the counts of resources compliant/non-compliant
const allApplicableRules = new Set();
const compliance = {};
const suppressionReasons = {};
for (const result of results) {
const rule = result.ruleOriginalName;
if (!compliance[rule]) {
compliance[rule] = {
compliantResources: new Set(),
nonCompliantResources: new Set(),
};
}
// Add to the set of all applicable rules so long as the rule is applicable
if (result.compliance !== pdk_nag_1.NagResultCompliance.NOT_APPLICABLE) {
allApplicableRules.add(rule);
}
if ([
pdk_nag_1.NagResultCompliance.NON_COMPLIANT,
pdk_nag_1.NagResultCompliance.ERROR,
pdk_nag_1.NagResultCompliance.NON_COMPLIANT_SUPPRESSED,
pdk_nag_1.NagResultCompliance.ERROR_SUPPRESSED,
].includes(result.compliance)) {
// Add the resource path to the compliance set
compliance[rule].nonCompliantResources.add(result.resource.node.path);
if (result.suppressionReason) {
suppressionReasons[rule] = [
...(suppressionReasons[rule] ?? []),
result.suppressionReason,
];
}
}
else if (result.compliance === pdk_nag_1.NagResultCompliance.COMPLIANT) {
// Resource is compliant
compliance[rule].compliantResources.add(result.resource.node.path);
}
}
const mitigationsById = Object.fromEntries(BASE_THREAT_MODEL.mitigations.map((m) => [m.id, m]));
const threatIdToMitigationIds = BASE_THREAT_MODEL.mitigationLinks.reduce((byId, m) => ({
...byId,
[m.linkedId]: [...(byId[m.linkedId] ?? []), m.mitigationId],
}), {});
// Get applicable threats - ie threats where there is a mitigation which is a CDK nag rule that is applicable to this project
const threats = (0, lodash_1.orderBy)(BASE_THREAT_MODEL.threats, "numericId")
.filter((threat) => {
const mitigationIds = threatIdToMitigationIds[threat.id] ?? [];
return mitigationIds.find((id) => {
const mitigationRule = this.getRuleFromMitigation(mitigationsById[id]);
return mitigationRule && allApplicableRules.has(mitigationRule);
});
})
.map((t, i) => ({
...t,
// Re-map numeric ids and display order
numericId: i + 1,
displayOrder: i + 1,
}));
// Get applicable mitigations
const mitigations = (0, lodash_1.orderBy)(BASE_THREAT_MODEL.mitigations, "numericId")
.map((m) => {
const mitigationRule = this.getRuleFromMitigation(mitigationsById[m.id]);
if (mitigationRule && compliance[mitigationRule]) {
const { compliantResources, nonCompliantResources } = compliance[mitigationRule];
const suppressions = suppressionReasons[mitigationRule];
const compliant = compliantResources.size;
const nonCompliant = nonCompliantResources.size;
// We can't really warrant adding a mitigation when 0 resources are compliant and there are no suppression reasons
if (compliant === 0 &&
(!suppressions || suppressions.length === 0)) {
return undefined;
}
const suppressionComment = suppressions
? `\n\n__Suppression Reasons__:\n${this.prettySuppressions(suppressions)
.map((reason) => `* ${reason}`)
.join("\n")}`
: "";
let comment = `${compliant} of ${compliant + nonCompliant} Resources Compliant.${suppressionComment}`;
// Threat composer limits comments to 1000 chars
if (comment.length > 1000) {
comment = comment.slice(0, 997) + "...";
}
return {
...m,
metadata: [
// TODO: Consider appending to existing comments rather than overriding
{
key: "Comments",
value: comment,
},
],
};
}
return undefined;
})
.filter((x) => x).map((m, i) => ({
...m,
// Re-map numeric ids and display order
numericId: i + 1,
displayOrder: i + 1,
}));
// Include only mitigation links where we have threats and mitigations
const projectThreatIds = new Set(threats.map(({ id }) => id));
const projectMitigationIds = new Set(mitigations.map(({ id }) => id));
const mitigationLinks = BASE_THREAT_MODEL.mitigationLinks.filter((link) => projectThreatIds.has(link.linkedId) &&
projectMitigationIds.has(link.mitigationId));
const threatModel = {
...BASE_THREAT_MODEL,
threats,
mitigations,
mitigationLinks,
architecture: {
...BASE_THREAT_MODEL.architecture,
image: options?.architectureImageDataUri ?? "",
},
applicationInfo: {
...BASE_THREAT_MODEL.applicationInfo,
name: options?.applicationDetails?.name ??
BASE_THREAT_MODEL.applicationInfo.name,
description: options?.applicationDetails?.description ??
BASE_THREAT_MODEL.applicationInfo.description,
},
};
// jest interprets the "import * as" import differently, so we remove this to ensure the snapshot
// is more realistic
if ("default" in threatModel) {
delete threatModel.default;
}
return threatModel;
}
}
exports.ThreatModelGenerator = ThreatModelGenerator;
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Copyright [Amazon.com](http://amazon.com/), Inc. or its affiliates. All Rights Reserved.\nSPDX-License-Identifier: Apache-2.0 */\nimport { ExtendedNagResult, NagResultCompliance } from \"@aws/pdk-nag\";\nimport { orderBy, uniq } from \"lodash\";\nimport * as BASE_THREAT_MODEL from \"./base-model/threat-composer-base-model.tc.json\";\nimport { ThreatComposerApplicationDetails } from \"./types\";\n\ntype ThreatComposerModel = typeof BASE_THREAT_MODEL;\ntype ThreatComposerThreat = ThreatComposerModel[\"threats\"][number];\ntype ThreatComposerMitigation = ThreatComposerModel[\"mitigations\"][number];\n\ninterface ComplianceFindings {\n  readonly compliantResources: Set<string>;\n  readonly nonCompliantResources: Set<string>;\n}\n\n// Mitigation content is the CDK Nag rule name.\nconst NAG_RULE_MITIGATION_PREFIX = \"cdk-nag rule: \";\n\n/**\n * Options for generating a Threat Composer threat model\n */\nexport interface ThreatModelGeneratorOptions {\n  /**\n   * Details about the application to include in the threat model\n   */\n  readonly applicationDetails?: ThreatComposerApplicationDetails;\n  /**\n   * A data uri for an architecture diagram image\n   */\n  readonly architectureImageDataUri?: string;\n}\n\n/**\n * Generates Threat Composer threat models based on CDK Nag results\n */\nexport class ThreatModelGenerator {\n  /**\n   * Given a Threat Composer mitigation, return the CDK Nag rule associated (if any)\n   */\n  private getRuleFromMitigation = (\n    mitigation?: ThreatComposerMitigation\n  ): string | undefined => {\n    if (mitigation?.content.startsWith(NAG_RULE_MITIGATION_PREFIX)) {\n      return mitigation.content.split(NAG_RULE_MITIGATION_PREFIX)[1] as\n        | string\n        | undefined;\n    }\n    return undefined;\n  };\n\n  /**\n   * Deduplicate suppression reasons, removing resource details if present\n   */\n  private prettySuppressions = (suppressions: string[]): string[] => {\n    return uniq(\n      suppressions.map((s) =>\n        s.startsWith(\"[\") ? s.slice(s.indexOf(\"] \") + 2) : s\n      )\n    );\n  };\n\n  /**\n   * Generate a threat model from a set of cdk nag results\n   */\n  public generate(\n    results: ExtendedNagResult[],\n    options?: ThreatModelGeneratorOptions\n  ): ThreatComposerModel {\n    // Summarise nag results into rules and the counts of resources compliant/non-compliant\n    const allApplicableRules = new Set<string>();\n    const compliance: { [nagRule: string]: ComplianceFindings } = {};\n    const suppressionReasons: { [nagRule: string]: string[] } = {};\n\n    for (const result of results) {\n      const rule = result.ruleOriginalName;\n\n      if (!compliance[rule]) {\n        compliance[rule] = {\n          compliantResources: new Set(),\n          nonCompliantResources: new Set(),\n        };\n      }\n\n      // Add to the set of all applicable rules so long as the rule is applicable\n      if (result.compliance !== NagResultCompliance.NOT_APPLICABLE) {\n        allApplicableRules.add(rule);\n      }\n\n      if (\n        [\n          NagResultCompliance.NON_COMPLIANT,\n          NagResultCompliance.ERROR,\n          NagResultCompliance.NON_COMPLIANT_SUPPRESSED,\n          NagResultCompliance.ERROR_SUPPRESSED,\n        ].includes(result.compliance)\n      ) {\n        // Add the resource path to the compliance set\n        compliance[rule].nonCompliantResources.add(result.resource.node.path);\n        if (result.suppressionReason) {\n          suppressionReasons[rule] = [\n            ...(suppressionReasons[rule] ?? []),\n            result.suppressionReason,\n          ];\n        }\n      } else if (result.compliance === NagResultCompliance.COMPLIANT) {\n        // Resource is compliant\n        compliance[rule].compliantResources.add(result.resource.node.path);\n      }\n    }\n\n    const mitigationsById = Object.fromEntries(\n      BASE_THREAT_MODEL.mitigations.map((m) => [m.id, m])\n    );\n    const threatIdToMitigationIds = BASE_THREAT_MODEL.mitigationLinks.reduce(\n      (byId, m) => ({\n        ...byId,\n        [m.linkedId]: [...(byId[m.linkedId] ?? []), m.mitigationId],\n      }),\n      {} as { [threatId: string]: string[] }\n    );\n\n    // Get applicable threats - ie threats where there is a mitigation which is a CDK nag rule that is applicable to this project\n    const threats: ThreatComposerThreat[] = orderBy(\n      BASE_THREAT_MODEL.threats,\n      \"numericId\"\n    )\n      .filter((threat) => {\n        const mitigationIds = threatIdToMitigationIds[threat.id] ?? [];\n        return mitigationIds.find((id) => {\n          const mitigationRule = this.getRuleFromMitigation(\n            mitigationsById[id]\n          );\n          return mitigationRule && allApplicableRules.has(mitigationRule);\n        });\n      })\n      .map((t, i) => ({\n        ...t,\n        // Re-map numeric ids and display order\n        numericId: i + 1,\n        displayOrder: i + 1,\n      }));\n\n    // Get applicable mitigations\n    const mitigations = (\n      orderBy(BASE_THREAT_MODEL.mitigations, \"numericId\")\n        .map((m) => {\n          const mitigationRule = this.getRuleFromMitigation(\n            mitigationsById[m.id]\n          );\n          if (mitigationRule && compliance[mitigationRule]) {\n            const { compliantResources, nonCompliantResources } =\n              compliance[mitigationRule];\n            const suppressions = suppressionReasons[mitigationRule];\n            const compliant = compliantResources.size;\n            const nonCompliant = nonCompliantResources.size;\n\n            // We can't really warrant adding a mitigation when 0 resources are compliant and there are no suppression reasons\n            if (\n              compliant === 0 &&\n              (!suppressions || suppressions.length === 0)\n            ) {\n              return undefined;\n            }\n\n            const suppressionComment = suppressions\n              ? `\\n\\n__Suppression Reasons__:\\n${this.prettySuppressions(\n                  suppressions\n                )\n                  .map((reason) => `* ${reason}`)\n                  .join(\"\\n\")}`\n              : \"\";\n\n            let comment = `${compliant} of ${\n              compliant + nonCompliant\n            } Resources Compliant.${suppressionComment}`;\n\n            // Threat composer limits comments to 1000 chars\n            if (comment.length > 1000) {\n              comment = comment.slice(0, 997) + \"...\";\n            }\n\n            return {\n              ...m,\n              metadata: [\n                // TODO: Consider appending to existing comments rather than overriding\n                {\n                  key: \"Comments\",\n                  value: comment,\n                },\n              ],\n            };\n          }\n          return undefined;\n        })\n        .filter((x) => x) as ThreatComposerMitigation[]\n    ).map((m, i) => ({\n      ...m,\n      // Re-map numeric ids and display order\n      numericId: i + 1,\n      displayOrder: i + 1,\n    }));\n\n    // Include only mitigation links where we have threats and mitigations\n    const projectThreatIds = new Set(threats.map(({ id }) => id));\n    const projectMitigationIds = new Set(mitigations.map(({ id }) => id));\n    const mitigationLinks = BASE_THREAT_MODEL.mitigationLinks.filter(\n      (link) =>\n        projectThreatIds.has(link.linkedId) &&\n        projectMitigationIds.has(link.mitigationId)\n    );\n\n    const threatModel = {\n      ...BASE_THREAT_MODEL,\n      threats,\n      mitigations,\n      mitigationLinks,\n      architecture: {\n        ...BASE_THREAT_MODEL.architecture,\n        image: options?.architectureImageDataUri ?? \"\",\n      },\n      applicationInfo: {\n        ...BASE_THREAT_MODEL.applicationInfo,\n        name:\n          options?.applicationDetails?.name ??\n          BASE_THREAT_MODEL.applicationInfo.name,\n        description:\n          options?.applicationDetails?.description ??\n          BASE_THREAT_MODEL.applicationInfo.description,\n      },\n    };\n\n    // jest interprets the \"import * as\" import differently, so we remove this to ensure the snapshot\n    // is more realistic\n    if (\"default\" in threatModel) {\n      delete threatModel.default;\n    }\n\n    return threatModel;\n  }\n}\n"]}