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Enabling Java Security Manager¶

The Java Security Manager is used to define various security policies that prevent untrusted code from manipulating your system. Enabling the Java Security Manager for MWARE products activates the Java permissions that are in the <API-M_HOME>/repository/conf/sec.policy file. You modify this file to change the Java security permissions as required.

Info

Before you begin

Ensure that you have Java 11 installed.
Note that you need to use a keystore for signing JARs using the Java security manager. In this example, you will be using the default keystore in your MWARE product ( wso2carbon.jks ). You can read about the recommendations for using keystores from here.

The steps below show how to enable the Java Security Manager for MWARE products.

Download the MWARE product to any location (e.g., <HOME>/user/<product-pack> folder).
Run the startup script in the <API-M_HOME>/bin folder. For Linux, it is api-manager.sh. Once the product is up and running, shutdown the server.
To sign the JARs in your product, you need a key. You can generate a new keystore (with a new key) by executing the keytool command given below. Note that the new keystore is created in the directory from which you execute the keytool command.
```
keytool -genkey -alias signFiles -keyalg RSA -keystore signkeystore.jks -validity 3650 -dname "CN=John,OU=Engineering, O=WSO2, L=Colombo, ST=Western, C=LK"
Enter keystore password:  
Re-enter new password:
Enter key password for
(RETURN if same as keystore password)
```
Now you have a new keystore (signkeystore.jks) with a new public key certificate (signFiles).

By default, MWARE products use the default wso2carbon.jks keystore for signing JARs. This keystore is stored in the <API-M_HOME>/repository/resources/security directory. Therefore, you need to add the signFiles public key certificate that you created earlier into the wso2carbon.jks keystore.

First, export the signFiles public key certificate from the signkeystore.jks keystore by executing the following command:

$ keytool -export -keystore signkeystore.jks -alias signFiles -file sign-cert.cer

Then, import the same signFiles certificate to the wso2carbon.jks keystore by executing the command given below. Be sure to specify the correct directory path to the wso2carbon.jks file of your product.

$ keytool -import -alias signFiles -file sign-cert.cer -keystore <PATH_to_API-M_HOME>/repository/resources/security/wso2carbon.jks
Enter keystore password:  
Owner: CN=John, OU=Engineering, O=WSO2, L=Colombo, ST=Western, C=LK
Issuer: CN=John, OU=Engineering, O=WSO2, L=Colombo, ST=Western, C=LK
Serial number: 5486f3b0
Valid from: Tue Dec 09 18:35:52 IST 2014 until: Fri Dec 06 18:35:52 IST 2024
Certificate fingerprints:
MD5:  54:13:FD:06:6F:C9:A6:BC:EE:DF:73:A9:88:CC:02:EC
SHA1: AE:37:2A:9E:66:86:12:68:28:88:12:A0:85:50:B1:D1:21:BD:49:52
Signature algorithm name: SHA1withRSA
Version: 3
Trust this certificate? [no]:  yes
Certificate was added to keystore

Note

Note that MWARE no longer recommends MD5 for JAR signing due to cryptographic limitations.

Prepare the scripts to sign the JARs and grant them the required permission(e.g., sudo chmod 755 signJar.sh). For example, the signJar.sh script given below can be used to sign each JAR file separately or you can use the signJars.sh script, which runs a loop to read all JARs and sign them.

signJar.sh script

#!/bin/bash
set -e
jarfile=$1
keystore_file="signkeystore.jks"
keystore_keyalias='signFiles'
keystore_storepass='wso2123'
keystore_keypass='wso2123'
signjar="$JAVA_HOME/bin/jarsigner -keystore $keystore_file -storepass $keystore_storepass -keypass $keystore_keypass"
verifyjar="$JAVA_HOME/bin/jarsigner -keystore $keystore_file -verify"
echo "Signing $jarfile"
$signjar $jarfile $keystore_keyalias
echo "Verifying $jarfile"
$verifyjar $jarfile
# Check whether the verification is successful.
if [ $? -eq 1 ]
then
    echo "Verification failed for $jarfile"
fi

signJars.sh script

#!/bin/bash
if [[ ! -d $1 ]]; then
    echo "Please specify a target directory"
    exit 1
fi
for jarfile in `find . -type f -iname \*.jar`
do
    ./signJar.sh $jarfile
done

Execute the following commands to sign the JARs in your product:
```
./signJars.sh /HOME/user/<product-pack>
```
Tip

Every time you add an external JAR to the MWARE product, sign them manually using the above instructions for the Java Security Manager to be effective. You add external JARs to the server when extending the product, applying patches etc.
Open the startup script in the <API-M_HOME>/bin folder. For Linux, it is api-manager.sh.

Add the following system properties to the startup script and save the file. Add them before the org.wso2.carbon.bootstrap.Bootstrap $* line.

-Djava.security.manager=org.wso2.carbon.bootstrap.CarbonSecurityManager \
-Djava.security.policy=$CARBON_HOME/repository/conf/sec.policy \
-Drestricted.packages=sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,org.wso2.carbon. \
-Ddenied.system.properties=javax.net.ssl.trustStore,javax.net.ssl.trustStorePassword,denied.system.properties \

Create a sec.policy file with the required security policies in the <API-M_HOME>/repository/conf folder and start the server. Starting the server makes the Java permissions defined in the sec.policy file to take effect.

An example of a sec.policy file is given below. It includes mostly MWARE Carbon-level permissions.

keystore "file:${user.dir}/repository/resources/security/wso2carbon.jks", "JKS";

grant {
  permission java.net.SocketPermission "*:1-65535", "connect,resolve";
  permission java.lang.RuntimePermission "accessClassInPackage.org.wso2.carbon.context";
  permission java.lang.RuntimePermission "accessClassInPackage.org.wso2.carbon.registry.api";
  permission java.lang.RuntimePermission "accessClassInPackage.org.wso2.carbon.registry.core";
  permission java.lang.RuntimePermission "accessClassInPackage.org.wso2.carbon.user.api";
  permission java.lang.RuntimePermission "accessClassInPackage.org.wso2.carbon.user.core";
  permission java.lang.RuntimePermission "accessClassInPackage.org.wso2.carbon.authenticator.stub";
  permission java.lang.RuntimePermission "accessClassInPackage.org.wso2.carbon.core.common";
  permission java.lang.management.ManagementPermission "control";
  permission java.lang.RuntimePermission "getClassLoader";
  permission java.lang.RuntimePermission "setContextClassLoader";
  permission java.lang.reflect.ReflectPermission "suppressAccessChecks";
  permission java.lang.RuntimePermission "accessDeclaredMembers";
  permission java.util.PropertyPermission "*", "read";
  permission java.lang.RuntimePermission "accessClassInPackage.sun.misc";
  permission java.lang.RuntimePermission "accessClassInPackage.sun.security.util";
  permission java.lang.RuntimePermission "modifyThreadGroup";
  permission java.io.FilePermission "*", "read";
};

grant signedBy "signfiles" {
  permission java.security.AllPermission;
};

grant codeBase "file:${user.dir}/repository/deployment/server/-" {
  permission java.security.AllPermission;
};

grant signedBy "signfiles",  codeBase "file:${user.dir}/bin/" {
  permission java.security.AllPermission;
};

grant codeBase "file:${java.home}/lib/-" {
  permission java.security.AllPermission;
};

grant codeBase "file:${java.home}/jre/lib/ext/-" {
  permission java.security.AllPermission;
};

grant codeBase "file:${java.home}/../lib/-" {
  permission java.security.AllPermission;
};

grant codeBase "file:${java.home}/lib/ext/-" {
  permission java.security.AllPermission;
};
grant codeBase "file:${java.home}/../lib/-" {
  permission java.security.AllPermission;
};

grant codeBase "file:${java.home}/lib/ext/-" {
  permission java.security.AllPermission;
};

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