@dollhousemcp/mcp-server
Version:
DollhouseMCP - A Model Context Protocol (MCP) server that enables dynamic AI persona management from markdown files, allowing Claude and other compatible AI assistants to activate and switch between different behavioral personas.
165 lines • 25.5 kB
JavaScript
import yaml from 'js-yaml';
import { z } from 'zod';
import { logger } from '../utils/logger.js';
import DOMPurify from 'dompurify';
import { JSDOM } from 'jsdom';
import { SECURITY_LIMITS } from './constants.js';
const PersonaMetadataSchema = z.object({
name: z.string().min(1).max(100),
description: z.string().min(1).max(1000),
unique_id: z.string().optional(),
author: z.string().max(50).optional(),
triggers: z.array(z.string().max(50)).max(20).optional(),
version: z.string().regex(/^\d+\.\d+\.\d+$/).optional(),
category: z.enum(['creative', 'professional', 'educational', 'gaming', 'personal']).optional(),
age_rating: z.enum(['all', '13+', '18+']).optional(),
content_flags: z.array(z.string()).optional(),
ai_generated: z.boolean().optional(),
generation_method: z.string().max(50).optional(),
price: z.string().max(20).optional(),
license: z.string().max(100).optional(),
created_date: z.string().optional()
});
export class YamlValidator {
// YAML bomb detection limits - extracted from Issue #164 review feedback
static YAML_BOMB_LIMITS = {
MAX_ANCHORS: 10, // Maximum allowed anchor definitions (&name)
MAX_ALIASES: 20, // Maximum allowed alias references (*name)
MAX_MERGE_KEYS: 5, // Maximum allowed merge key operations (<<:)
MAX_DOCUMENTS: 3 // Maximum allowed documents in a single YAML
};
// Static cache for DOMPurify to improve performance
static purifyWindow = null;
static purify = null;
static parsePersonaMetadataSafely(yamlContent) {
if (!yamlContent || typeof yamlContent !== 'string') {
throw new Error('YAML content must be a non-empty string');
}
// Size check
if (yamlContent.length > SECURITY_LIMITS.MAX_YAML_LENGTH) {
throw new Error(`YAML content too large: ${yamlContent.length} bytes (max: ${SECURITY_LIMITS.MAX_YAML_LENGTH})`);
}
// Check for dangerous tags - expanded from Issue #164
const dangerousTags = [
'!!js/', '!!python/', '!!ruby/', '!!perl/', '!!php/',
'!!java', '!!javax', '!!com.sun',
'!!exec', '!!eval', '!!new', '!!construct', '!!apply',
'!!call', '!!invoke', '!!binary', '!!merge'
];
for (const tag of dangerousTags) {
if (yamlContent.includes(tag)) {
throw new Error(`Dangerous YAML tag detected: ${tag}`);
}
}
// Enhanced YAML bomb protection - Issue #164
const anchorCount = (yamlContent.match(/&\w+/g) || []).length;
const aliasCount = (yamlContent.match(/\*\w+/g) || []).length;
const mergeKeyCount = (yamlContent.match(/<<:/g) || []).length;
const documentCount = (yamlContent.match(/^---/gm) || []).length;
if (anchorCount > this.YAML_BOMB_LIMITS.MAX_ANCHORS ||
aliasCount > this.YAML_BOMB_LIMITS.MAX_ALIASES ||
mergeKeyCount > this.YAML_BOMB_LIMITS.MAX_MERGE_KEYS ||
documentCount > this.YAML_BOMB_LIMITS.MAX_DOCUMENTS) {
throw new Error(`Potential YAML bomb detected: anchors=${anchorCount}, aliases=${aliasCount}, merges=${mergeKeyCount}, documents=${documentCount}`);
}
// Check for nested tag combinations
const nestedTagPattern = /[&*]\w+\s*!!/;
if (nestedTagPattern.test(yamlContent)) {
throw new Error('Dangerous nested YAML tag combination detected');
}
try {
// Use safe load with restricted schema
const rawData = yaml.load(yamlContent, {
schema: yaml.CORE_SCHEMA, // No functions, only basic types
onWarning: (warning) => {
logger.warn('YAML parsing warning:', warning);
}
});
// Validate against schema
const validatedData = PersonaMetadataSchema.parse(rawData);
// Additional sanitization
return this.sanitizeMetadata(validatedData);
}
catch (error) {
if (error instanceof Error && error.name === 'YAMLException') {
throw new Error(`Invalid YAML syntax: ${error.message}`);
}
throw new Error(`Invalid persona metadata: ${error instanceof Error ? error.message : String(error)}`);
}
}
static sanitizeMetadata(data) {
const sanitized = { ...data };
// Sanitize string fields
const stringFields = ['name', 'description', 'author', 'unique_id'];
for (const field of stringFields) {
if (sanitized[field]) {
sanitized[field] = this.sanitizeString(sanitized[field]);
}
}
// Sanitize array fields
if (sanitized.triggers) {
sanitized.triggers = sanitized.triggers.map((t) => this.sanitizeString(t));
}
return sanitized;
}
/**
* Initialize DOMPurify instance if not already initialized
*/
static initializePurify() {
if (!this.purifyWindow || !this.purify) {
const dom = new JSDOM('');
this.purifyWindow = dom.window;
this.purify = DOMPurify(this.purifyWindow);
}
}
/**
* Sanitize string input using DOMPurify to prevent XSS attacks
* This replaces the regex-based approach with a more robust solution
*/
static sanitizeString(input) {
// Limit input length to prevent DoS
if (input.length > 10000) {
input = input.substring(0, 10000);
}
// Initialize DOMPurify if needed
this.initializePurify();
// Use DOMPurify with strict configuration
// ALLOWED_TAGS: [] strips all HTML tags
// ALLOWED_ATTR: [] strips all attributes
// FORBID_TAGS/FORBID_ATTR provide additional protection
let sanitized = this.purify.sanitize(input, {
ALLOWED_TAGS: [], // Strip all HTML tags
ALLOWED_ATTR: [], // Strip all attributes
FORBID_TAGS: ['style', 'script', 'iframe', 'object', 'embed', 'link'],
FORBID_ATTR: ['onerror', 'onload', 'onclick', 'onmouseover', 'style', 'href', 'src']
});
// Additional protection against command injection patterns
// These patterns might not be caught by DOMPurify
const commandInjectionPatterns = [
/`[^`]{0,1000}`/g, // Backtick expressions
/\$\([^)]{0,1000}\)/g, // Command substitution
/\$\{[^}]{0,1000}\}/g, // Variable expansion
/\\x[0-9a-fA-F]{2}/g, // Hex escapes
/\\u[0-9a-fA-F]{4}/g, // Unicode escapes
/\\[0-7]{1,3}/g // Octal escapes
];
for (const pattern of commandInjectionPatterns) {
sanitized = sanitized.replace(pattern, '');
}
// Remove null bytes and normalize whitespace
sanitized = sanitized
// eslint-disable-next-line no-control-regex -- Intentionally removing null bytes for security
.replaceAll(/\u0000/g, '') // NOSONAR - Remove null bytes for security
.replaceAll(/[\r\n]+/g, ' ') // Replace newlines with spaces
.trim();
return sanitized;
}
/**
* Reset static DOMPurify cache (useful for long-running processes)
*/
static resetCache() {
this.purifyWindow = null;
this.purify = null;
}
}
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yaml from 'js-yaml';\nimport { z } from 'zod';\nimport { logger } from '../utils/logger.js';\nimport DOMPurify from 'dompurify';\nimport { JSDOM } from 'jsdom';\nimport { SECURITY_LIMITS } from './constants.js';\n\nconst PersonaMetadataSchema = z.object({\n  name: z.string().min(1).max(100),\n  description: z.string().min(1).max(1000),\n  unique_id: z.string().optional(),\n  author: z.string().max(50).optional(),\n  triggers: z.array(z.string().max(50)).max(20).optional(),\n  version: z.string().regex(/^\\d+\\.\\d+\\.\\d+$/).optional(),\n  category: z.enum(['creative', 'professional', 'educational', 'gaming', 'personal']).optional(),\n  age_rating: z.enum(['all', '13+', '18+']).optional(),\n  content_flags: z.array(z.string()).optional(),\n  ai_generated: z.boolean().optional(),\n  generation_method: z.string().max(50).optional(),\n  price: z.string().max(20).optional(),\n  license: z.string().max(100).optional(),\n  created_date: z.string().optional()\n});\n\n// Type declarations for better type safety\ntype DOMPurifyInstance = ReturnType<typeof DOMPurify>;\n\nexport class YamlValidator {\n  // YAML bomb detection limits - extracted from Issue #164 review feedback\n  private static readonly YAML_BOMB_LIMITS = {\n    MAX_ANCHORS: 10,        // Maximum allowed anchor definitions (&name)\n    MAX_ALIASES: 20,        // Maximum allowed alias references (*name)\n    MAX_MERGE_KEYS: 5,      // Maximum allowed merge key operations (<<:)\n    MAX_DOCUMENTS: 3        // Maximum allowed documents in a single YAML\n  };\n\n  // Static cache for DOMPurify to improve performance\n  private static purifyWindow: any = null;\n  private static purify: DOMPurifyInstance | null = null;\n\n  static parsePersonaMetadataSafely(yamlContent: string): any {\n    if (!yamlContent || typeof yamlContent !== 'string') {\n      throw new Error('YAML content must be a non-empty string');\n    }\n    \n    // Size check\n    if (yamlContent.length > SECURITY_LIMITS.MAX_YAML_LENGTH) {\n      throw new Error(`YAML content too large: ${yamlContent.length} bytes (max: ${SECURITY_LIMITS.MAX_YAML_LENGTH})`);\n    }\n    \n    // Check for dangerous tags - expanded from Issue #164\n    const dangerousTags = [\n      '!!js/', '!!python/', '!!ruby/', '!!perl/', '!!php/',\n      '!!java', '!!javax', '!!com.sun',\n      '!!exec', '!!eval', '!!new', '!!construct', '!!apply',\n      '!!call', '!!invoke', '!!binary', '!!merge'\n    ];\n    \n    for (const tag of dangerousTags) {\n      if (yamlContent.includes(tag)) {\n        throw new Error(`Dangerous YAML tag detected: ${tag}`);\n      }\n    }\n    \n    // Enhanced YAML bomb protection - Issue #164\n    const anchorCount = (yamlContent.match(/&\\w+/g) || []).length;\n    const aliasCount = (yamlContent.match(/\\*\\w+/g) || []).length;\n    const mergeKeyCount = (yamlContent.match(/<<:/g) || []).length;\n    const documentCount = (yamlContent.match(/^---/gm) || []).length;\n    \n    if (anchorCount > this.YAML_BOMB_LIMITS.MAX_ANCHORS || \n        aliasCount > this.YAML_BOMB_LIMITS.MAX_ALIASES || \n        mergeKeyCount > this.YAML_BOMB_LIMITS.MAX_MERGE_KEYS || \n        documentCount > this.YAML_BOMB_LIMITS.MAX_DOCUMENTS) {\n      throw new Error(`Potential YAML bomb detected: anchors=${anchorCount}, aliases=${aliasCount}, merges=${mergeKeyCount}, documents=${documentCount}`);\n    }\n    \n    // Check for nested tag combinations\n    const nestedTagPattern = /[&*]\\w+\\s*!!/;\n    if (nestedTagPattern.test(yamlContent)) {\n      throw new Error('Dangerous nested YAML tag combination detected');\n    }\n    \n    try {\n      // Use safe load with restricted schema\n      const rawData = yaml.load(yamlContent, {\n        schema: yaml.CORE_SCHEMA, // No functions, only basic types\n        onWarning: (warning) => {\n          logger.warn('YAML parsing warning:', warning);\n        }\n      });\n      \n      // Validate against schema\n      const validatedData = PersonaMetadataSchema.parse(rawData);\n      \n      // Additional sanitization\n      return this.sanitizeMetadata(validatedData);\n    } catch (error) {\n      if (error instanceof Error && error.name === 'YAMLException') {\n        throw new Error(`Invalid YAML syntax: ${error.message}`);\n      }\n      throw new Error(`Invalid persona metadata: ${error instanceof Error ? error.message : String(error)}`);\n    }\n  }\n\n  private static sanitizeMetadata(data: any): any {\n    const sanitized = { ...data };\n    \n    // Sanitize string fields\n    const stringFields = ['name', 'description', 'author', 'unique_id'];\n    for (const field of stringFields) {\n      if (sanitized[field]) {\n        sanitized[field] = this.sanitizeString(sanitized[field]);\n      }\n    }\n    \n    // Sanitize array fields\n    if (sanitized.triggers) {\n      sanitized.triggers = sanitized.triggers.map((t: string) => this.sanitizeString(t));\n    }\n    \n    return sanitized;\n  }\n\n  /**\n   * Initialize DOMPurify instance if not already initialized\n   */\n  private static initializePurify(): void {\n    if (!this.purifyWindow || !this.purify) {\n      const dom = new JSDOM('');\n      this.purifyWindow = dom.window;\n      this.purify = DOMPurify(this.purifyWindow);\n    }\n  }\n\n  /**\n   * Sanitize string input using DOMPurify to prevent XSS attacks\n   * This replaces the regex-based approach with a more robust solution\n   */\n  private static sanitizeString(input: string): string {\n    // Limit input length to prevent DoS\n    if (input.length > 10000) {\n      input = input.substring(0, 10000);\n    }\n    \n    // Initialize DOMPurify if needed\n    this.initializePurify();\n    \n    // Use DOMPurify with strict configuration\n    // ALLOWED_TAGS: [] strips all HTML tags\n    // ALLOWED_ATTR: [] strips all attributes\n    // FORBID_TAGS/FORBID_ATTR provide additional protection\n    let sanitized = this.purify!.sanitize(input, {\n      ALLOWED_TAGS: [],      // Strip all HTML tags\n      ALLOWED_ATTR: [],      // Strip all attributes\n      FORBID_TAGS: ['style', 'script', 'iframe', 'object', 'embed', 'link'],\n      FORBID_ATTR: ['onerror', 'onload', 'onclick', 'onmouseover', 'style', 'href', 'src']\n    });\n    \n    // Additional protection against command injection patterns\n    // These patterns might not be caught by DOMPurify\n    const commandInjectionPatterns = [\n      /`[^`]{0,1000}`/g,           // Backtick expressions\n      /\\$\\([^)]{0,1000}\\)/g,       // Command substitution\n      /\\$\\{[^}]{0,1000}\\}/g,       // Variable expansion\n      /\\\\x[0-9a-fA-F]{2}/g,        // Hex escapes\n      /\\\\u[0-9a-fA-F]{4}/g,        // Unicode escapes\n      /\\\\[0-7]{1,3}/g              // Octal escapes\n    ];\n    \n    for (const pattern of commandInjectionPatterns) {\n      sanitized = sanitized.replace(pattern, '');\n    }\n    \n    // Remove null bytes and normalize whitespace\n    sanitized = sanitized\n      // eslint-disable-next-line no-control-regex -- Intentionally removing null bytes for security\n      .replaceAll(/\\u0000/g, '')          // NOSONAR - Remove null bytes for security\n      .replaceAll(/[\\r\\n]+/g, ' ')      // Replace newlines with spaces\n      .trim();\n    \n    return sanitized;\n  }\n  \n  /**\n   * Reset static DOMPurify cache (useful for long-running processes)\n   */\n  public static resetCache(): void {\n    this.purifyWindow = null;\n    this.purify = null;\n  }\n}"]}