diff --git a/GEMINI.md b/GEMINI.md index dd4ef5f..4360d45 100644 --- a/GEMINI.md +++ b/GEMINI.md @@ -26,7 +26,7 @@ You are a highly skilled senior security and privacy engineer. You are meticulou 2. **Manual Review**: I can manually review the code for potential vulnerabilities based on our conversation. ``` * Explicitly ask the user which they would prefer before proceeding. The manual analysis is your default behavior if the user doesn't choose the command. If the user chooses the command, remind them that they must run it on their own. -* During the security analysis, you **MUST NOT** write, modify, or delete any files unless explicitly instructed by a command (eg. `/security:analyze`). Artifacts created during security analysis should be stored in a `.gemini_security/` directory in the user's workspace. +* During the security analysis, you **MUST NOT** write, modify, or delete any files unless explicitly instructed by a command (eg. `/security:analyze`). Artifacts created during security analysis should be stored in a `.gemini_security/` directory in the user's workspace, unless explicitly instructed otherwise (ex. `.gemini_security` folder). ## Skillset: SAST Vulnerability Analysis diff --git a/mcp-server/package-lock.json b/mcp-server/package-lock.json index 1d56752..bce8a4f 100644 --- a/mcp-server/package-lock.json +++ b/mcp-server/package-lock.json @@ -1016,6 +1016,37 @@ "node": ">=12" } }, + "node_modules/base64-js": { + "version": "1.5.1", + "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz", + "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==", + "funding": [ + { + "type": "github", + "url": "https://github.com/sponsors/feross" + }, + { + "type": "patreon", + "url": "https://www.patreon.com/feross" + }, + { + "type": "consulting", + "url": "https://feross.org/support" + } + ], + "license": "MIT" + }, + "node_modules/bl": { + "version": "4.1.0", + 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"https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz", + "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==", + "license": "Apache-2.0", + "dependencies": { + "safe-buffer": "^5.0.1" + }, + "engines": { + "node": "*" + } + }, "node_modules/type-is": { "version": "2.0.1", "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz", @@ -2405,6 +2798,21 @@ "node": ">= 0.8" } }, + "node_modules/uri-js": { + "version": "4.4.1", + "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz", + "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==", + "license": "BSD-2-Clause", + "dependencies": { + "punycode": "^2.1.0" + } + }, + "node_modules/util-deprecate": { + "version": "1.0.2", + "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz", + "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==", + "license": "MIT" + }, "node_modules/vary": { "version": "1.1.2", "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz", diff --git a/mcp-server/src/index.ts b/mcp-server/src/index.ts index 23bc8a7..9bbd631 100644 --- a/mcp-server/src/index.ts +++ b/mcp-server/src/index.ts @@ -14,6 +14,8 @@ import path from 'path'; import { getAuditScope } from './filesystem.js'; import { findLineNumbers } from './security.js'; +import { validatePocParams, runPoc } from './poc.js'; + const server = new McpServer({ name: 'gemini-cli-security', version: '0.1.0', @@ -50,6 +52,25 @@ server.tool( } ); +server.tool( + 'validate_poc_params', + 'Validates the parameters for the PoC generation.', + { + vulnerabilityType: z.string().describe('The type of vulnerability.'), + sourceCode: z.string().describe('The source code of the vulnerable file.'), + }, + (input) => validatePocParams(input) +); + +server.tool( + 'run_poc', + 'Runs the generated PoC code.', + { + code: z.string().describe('The PoC code to run.'), + }, + (input) => runPoc(input) +); + server.registerPrompt( 'security:note-adder', { @@ -94,6 +115,48 @@ Your primary goal is to maintain strict consistency with the format of the note }), ); +server.registerPrompt( + 'poc', + { + title: 'PoC Generator', + description: 'Generates a Proof-of-Concept (PoC) for a given vulnerability.', + argsSchema: { + vulnerabilityType: z.string().optional().describe('The type of vulnerability.'), + sourceCode: z.string().optional().describe('The source code of the vulnerable file.'), + }, + }, + ({ vulnerabilityType, sourceCode }) => ({ + messages: [ + { + role: 'user', + content: { + type: 'text', + text: `You are a security expert. Your task is to generate a Proof-of-Concept (PoC) for a vulnerability. + +Input Parameters: +- Vulnerability Type: ${vulnerabilityType || 'Not provided'} +- Source Code: ${sourceCode || 'Not provided'} + +**Workflow:** + +1. **Validate Parameters:** + * If 'vulnerabilityType' or 'sourceCode' are NOT provided, you MUST ask the user for them. + * If they ARE provided, you MUST use the 'validate_poc_params' tool to validate them. + +2. **Generate PoC:** + * Once parameters are validated, generate a Node.js script that demonstrates the vulnerability under the '.gemini_security/poc/' directory; create the directory if it doesn't exist. + * The script should be self-contained and executable. + +3. **Run PoC:** + * Ask the user for confirmation to run the generated PoC. + * If confirmed, use the 'run_poc' tool with absolute file paths to execute the code. + * Analyze the output to verify if the vulnerability is reproducible.`, + }, + }, + ], + }), +); + async function startServer() { const transport = new StdioServerTransport(); await server.connect(transport); diff --git a/mcp-server/src/poc.test.ts b/mcp-server/src/poc.test.ts new file mode 100644 index 0000000..4026e51 --- /dev/null +++ b/mcp-server/src/poc.test.ts @@ -0,0 +1,62 @@ +import { describe, it, vi, expect } from 'vitest'; +import { validatePocParams, runPoc } from './poc.js'; + +describe('validatePocParams', () => { + it('should return valid message when parameters are provided', async () => { + const result = await validatePocParams({ + vulnerabilityType: 'SQL Injection', + sourceCode: 'SELECT * FROM users WHERE id = ' + 1, + }); + + expect(result.isError).toBeUndefined(); + expect(result.content[0].text).toBe( + JSON.stringify({ message: 'Parameters are valid.' }) + ); + }); + + it('should return error when vulnerabilityType is missing', async () => { + const result = await validatePocParams({ + vulnerabilityType: '', + sourceCode: 'code', + }); + + expect(result.isError).toBe(true); + expect(result.content[0].text).toBe( + JSON.stringify({ error: 'Vulnerability type is required.' }) + ); + }); + + it('should return error when sourceCode is missing', async () => { + const result = await validatePocParams({ + vulnerabilityType: 'type', + sourceCode: '', + }); + + expect(result.isError).toBe(true); + expect(result.content[0].text).toBe( + JSON.stringify({ error: 'Source code is required.' }) + ); + }); +}); + +describe('runPoc', () => { + it('should write file and execute it', async () => { + const result = await runPoc( + { code: 'console.log("test")' } + ); + + expect(result.content[0].text).toBe( + JSON.stringify({ stdout: 'test', stderr: '' }) + ); + }); + + it('should handle execution errors', async () => { + const result = await runPoc( + { code: 'throw new Error("Execution failed")' } + ); + + expect(result.isError).toBe(true); + expect(result.content[0].text).toContain('Execution failed'); + }); + +}); diff --git a/mcp-server/src/poc.ts b/mcp-server/src/poc.ts new file mode 100644 index 0000000..4933d94 --- /dev/null +++ b/mcp-server/src/poc.ts @@ -0,0 +1,114 @@ +/** + * @license + * Copyright 2025 Google LLC + * SPDX-License-Identifier: Apache-2.0 + */ + +import { CallToolResult } from '@modelcontextprotocol/sdk/types.js'; +import { promises as fs } from 'fs'; +import path from 'path'; +import { exec } from 'child_process'; +import { promisify } from 'util'; +import ivm from 'isolated-vm'; + +const execAsync = promisify(exec); + +export async function validatePocParams( + { + vulnerabilityType, + sourceCode, + }: { + vulnerabilityType: string; + sourceCode: string; + } +): Promise { + if (!vulnerabilityType || !vulnerabilityType.trim()) { + return { + content: [ + { + type: 'text', + text: JSON.stringify({ error: 'Vulnerability type is required.' }), + }, + ], + isError: true, + }; + } + + if (!sourceCode || !sourceCode.trim()) { + return { + content: [ + { + type: 'text', + text: JSON.stringify({ error: 'Source code is required.' }), + }, + ], + isError: true, + }; + } + + return { + content: [ + { + type: 'text', + text: JSON.stringify({ message: 'Parameters are valid.' }), + }, + ], + }; +} + +export async function runPoc( + { + code, + }: { + code: string; + } +): Promise { + try { + const isolate = new ivm.Isolate({ memoryLimit: 128 }); + const context = await isolate.createContext(); + const jail = context.global; + await jail.set('global', jail.derefInto()); + + const logs: string[] = []; + await jail.set('print', new ivm.Reference((...args: any[]) => { + logs.push(args.map(arg => String(arg)).join(' ')); + })); + + await context.eval(` + global.console = { + log: function(...args) { + print.apply(undefined, args, { arguments: { copy: true } }); + }, + error: function(...args) { + print.apply(undefined, args, { arguments: { copy: true } }); + } + }; + `); + + const script = await isolate.compileScript(code); + await script.run(context); + + return { + content: [ + { + type: 'text', + text: JSON.stringify({ stdout: logs.join('\n'), stderr: '' }), + }, + ], + }; + } catch (error) { + let errorMessage = 'An unknown error occurred.'; + if (error instanceof Error) { + errorMessage = error.message; + } + return { + content: [ + { + type: 'text', + text: JSON.stringify({ error: errorMessage }), + }, + ], + isError: true, + }; + } +}