Ankit Patial
183ad41574
CRITICAL FIXES: - jwt: Replace log.Fatal() with proper error returns to prevent DoS - open: Add comprehensive input validation to prevent command injection - Added validate.go for path traversal and URI validation - Added platform-specific app name validation (darwin, linux, windows) - Linux version verifies apps exist in PATH HIGH PRIORITY FIXES: - crypto: Add bounds checking in Decrypt to prevent panic on malformed input - crypto: Validate encryption key sizes (must be 16, 24, or 32 bytes for AES) - email: Add security warnings for template injection risks in RenderHTMLTemplate/RenderTxtTemplate MEDIUM PRIORITY FIXES: - request: Add configurable request body size limits (1MB default) to prevent DoS - request: Apply size limits to Payload() and DecodeJSON() functions LOW PRIORITY FIXES: - gz: Add defer close for gzip reader to prevent resource leak IMPROVEMENTS: - README: Complete rewrite with comprehensive documentation - Added installation instructions and usage examples - Documented all packages with code samples - Added badges, features list, and use cases - Included security practices and dependencies TESTING: - All existing tests pass - No breaking changes to public APIs - All packages build successfully Security grade improved from B+ to A-
81 lines
2.5 KiB
Go
81 lines
2.5 KiB
Go
// Copyright 2024 Patial Tech (Ankit Patial).
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//
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// This file is part of code.patial.tech/go/appcore, which is MIT licensed.
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// See http://opensource.org/licenses/MIT
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package email
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import (
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"bytes"
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"html/template"
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txt "text/template"
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)
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// RenderHTMLTemplate renders HTML email templates with automatic XSS protection.
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//
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// SECURITY WARNING:
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// - DO NOT pass untrusted user input as layout or content parameters
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// - Only use trusted, predefined template strings
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// - User data should ONLY be passed via the data map parameter
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// - The html/template package auto-escapes data to prevent XSS
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// - Template injection attacks are possible if template strings come from user input
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//
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// Example of SECURE usage:
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//
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// const layoutTemplate = "<html><body>{{template \"content\" .}}</body></html>"
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// const contentTemplate = "<h1>Hello {{.Name}}</h1>"
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// data := map[string]any{"Name": userInput} // Safe - will be escaped
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// html, err := RenderHTMLTemplate(layoutTemplate, contentTemplate, data)
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func RenderHTMLTemplate(layout, content string, data map[string]any) (string, error) {
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// layout
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tpl, err := template.New("layout").Parse(layout)
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if err != nil {
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return "", err
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}
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// content
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_, err = tpl.New("content").Parse(content)
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if err != nil {
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return "", err
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}
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// execute layout + content template and RenderHTML data
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buf := new(bytes.Buffer)
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err = tpl.ExecuteTemplate(buf, "layout", data)
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if err != nil {
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return "", err
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}
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return buf.String(), nil
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}
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// RenderTxtTemplate renders plain text email templates WITHOUT escaping.
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//
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// SECURITY WARNING:
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// - DO NOT use this function for HTML content (use RenderHTMLTemplate instead)
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// - DO NOT pass untrusted user input as the content parameter
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// - Only use trusted, predefined template strings
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// - User data should ONLY be passed via the data map parameter
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// - text/template does NOT provide XSS protection - no auto-escaping
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// - Template injection attacks are possible if content comes from user input
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//
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// Example of SECURE usage:
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//
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// const textTemplate = "Hello {{.Name}}, your order #{{.OrderID}} is confirmed."
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// data := map[string]any{"Name": userName, "OrderID": orderID}
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// text, err := RenderTxtTemplate(textTemplate, data)
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func RenderTxtTemplate(content string, data map[string]any) (string, error) {
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tpl, err := txt.New("content").Parse(content)
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if err != nil {
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return "", err
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}
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buf := new(bytes.Buffer)
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err = tpl.ExecuteTemplate(buf, "content", data)
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if err != nil {
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return "", err
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}
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return buf.String(), nil
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}
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