Files
tasks/common/util/wildcard.go
671f160746 Add dynamic config to control allowed Host headers (#6750)
## What changed?

Add a dynamic config to restrict which HTTP `Host` header values are
allowed in HTTP API requests.

## Why?

Prevent DNS rebinding attacks.

## How did you test it?

Added a functional test.

---------

Co-authored-by: David Reiss <[email protected]>
2024-11-14 19:12:24 +00:00

62 lines
2.2 KiB
Go

// The MIT License
//
// Copyright (c) 2024 Temporal Technologies Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package util
import (
"errors"
"regexp"
"strings"
)
// WildCardStringToRegexp converts a given string pattern to a regular expression matching wildcards (*) with any
// substring.
func WildCardStringToRegexp(pattern string) (*regexp.Regexp, error) {
if pattern == "" {
return nil, errors.New("pattern cannot be empty")
}
return WildCardStringsToRegexp([]string{pattern})
}
// WildCardStringToRegexps converts a given slices of string patterns to a slice of regular expressions matching
// wildcards (*) with any substring.
func WildCardStringsToRegexp(patterns []string) (*regexp.Regexp, error) {
var result strings.Builder
result.WriteRune('^')
for i, pattern := range patterns {
result.WriteRune('(')
for i, literal := range strings.Split(pattern, "*") {
if i > 0 {
// Replace * with .*
result.WriteString(".*")
}
result.WriteString(regexp.QuoteMeta(literal))
}
result.WriteRune(')')
if i < len(patterns)-1 {
result.WriteRune('|')
}
}
result.WriteRune('$')
return regexp.Compile(result.String())
}