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@@ -25,3 +25,4 @@ def main(tag): | |
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| # here start main | ||
| main(sys.argv[1]) | ||
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| Original file line number | Diff line number | Diff line change |
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| # Swagger Parser Safe URL Resolver | ||
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| The `swagger-parser-safe-url-resolver` is a library used for verifying that the hostname of URLs does not resolve to a private/restricted IPv4/IPv6 address range. | ||
| This library can be used in services that deal with user-submitted URLs that get fetched (like in swagger-parser when resolving external URL $refs) to protect against Server-Side Request Forgery and DNS rebinding attacks. | ||
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| ## How does it work? | ||
| The main class of the package is the `PermittedUrlsChecker` which has one method: `verify(String url)`. | ||
| This method takes in a string URL and performs the following steps: | ||
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| 1. Gets the hostname portion from the URL | ||
| 2. Resolves the hostname to an IP address | ||
| 3. Checks if that IP address is in a private/restricted IP address range (and throws an exception if it is) | ||
| 4. Returns a `ResolvedUrl` object which contains | ||
| 4.1. `String url` where the original URL has the hostname replaced with the IP address | ||
| 4.2. A `String hostHeader` which contains the hostname from the original URL to be added as a host header | ||
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| This behavior can also be customized with the allowlist and denylist in the constructor, whereby: | ||
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| - An entry in the allowlist will allow the URL to pass even if it resolves to a private/restricted IP address | ||
| - An entry in the denylist will throw an exception even when the URL resolves to a public IP address | ||
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| ## Installation | ||
| Add the following to you `pom.xml` file under `dependencies` | ||
| ```xml | ||
| <dependency> | ||
| <groupId>io.swagger.parser.v3</groupId> | ||
| <artifactId>swagger-parser-safe-url-resolver</artifactId> | ||
| // version of swagger-parser being used | ||
| <version>2.1.14</version> | ||
| </dependency> | ||
| ``` | ||
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| ## Example usage | ||
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| ```java | ||
| import io.swagger.v3.parser.urlresolver.PermittedUrlsChecker; | ||
| import io.swagger.v3.parser.urlresolver.exceptions.HostDeniedException; | ||
| import io.swagger.v3.parser.urlresolver.models.ResolvedUrl; | ||
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| import java.util.List; | ||
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| public class Main { | ||
| public static void main() { | ||
| List<String> allowlist = List.of("mysite.local"); | ||
| List<String> denylist = List.of("*.example.com:443"); | ||
| var checker = new PermittedUrlsChecker(allowlist, denylist); | ||
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| try { | ||
| // Will throw a HostDeniedException as `localhost` | ||
| // resolves to local IP and is not in allowlist | ||
| checker.verify("http://localhost/example"); | ||
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| // Will return a ResolvedUrl if `github.com` | ||
| // resolves to a public IP | ||
| checker.verify("https://github.com/swagger-api/swagger-parser"); | ||
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| // Will throw a HostDeniedException as `*.example.com` is | ||
| // explicitly deny listed, even if it resolves to public IP | ||
| checker.verify("https://subdomain.example.com/somepage"); | ||
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| // Will return a `ResolvedUrl` as `mysite.local` | ||
| // is explicitly allowlisted | ||
| ResolvedUrl resolvedUrl = checker.verify("http://mysite.local/example"); | ||
| System.out.println(resolvedUrl.getUrl()); // "http://127.0.0.1/example" | ||
| System.out.println(resolvedUrl.getHostHeader()); // "mysite.local" | ||
| } catch (HostDeniedException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| } | ||
| ``` |
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| <?xml version="1.0" encoding="UTF-8"?> | ||
| <project xmlns="http://maven.apache.org/POM/4.0.0" | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | ||
| <parent> | ||
| <groupId>io.swagger</groupId> | ||
| <artifactId>swagger-parser-project</artifactId> | ||
| <version>1.0.70-SNAPSHOT</version> | ||
| <relativePath>../..</relativePath> | ||
| </parent> | ||
| <modelVersion>4.0.0</modelVersion> | ||
| <artifactId>swagger-parser-safe-url-resolver</artifactId> | ||
| <packaging>jar</packaging> | ||
| <name>swagger-parser-safe-url-resolver</name> | ||
| <dependencies> | ||
| <dependency> | ||
| <groupId>commons-io</groupId> | ||
| <artifactId>commons-io</artifactId> | ||
| <version>${commons-io-version}</version> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>org.slf4j</groupId> | ||
| <artifactId>slf4j-simple</artifactId> | ||
| <version>${slf4j-version}</version> | ||
| <scope>test</scope> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>org.testng</groupId> | ||
| <artifactId>testng</artifactId> | ||
| <version>${testng-version}</version> | ||
| <scope>test</scope> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>junit</groupId> | ||
| <artifactId>junit</artifactId> | ||
| <version>${junit-version}</version> | ||
| <scope>test</scope> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>org.jmockit</groupId> | ||
| <artifactId>jmockit</artifactId> | ||
| <version>${jmockit-version}</version> | ||
| <scope>test</scope> | ||
| </dependency> | ||
| </dependencies> | ||
| </project> |
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