Improving security in case of malicious archive content

Talend JobServer has built in protection against ZIP Slip and ZIP Symlink attacks. To harden it even more, you can set limits for archive properties in order to protect Talend JobServer against malicious Job archive content.

In case of malicious Job archive content, Denial of Service attacks aiming to break the file system or exhaust disk space might be performed.

To avoid this risk, you can set harder limits for folders and files names, taking into account the space needed for your Job deployments. The default values are stored in the org.talend.remote.jobserver.server.cfg file located in etc directory.

These values should not be higher than the name sizes supported by the file system used for the TalendJobServersFiles folder. If one or various limits are exceeded, an error message is displayed and the deployment is rejected.

Note: You can use the following command to check current limits on Linux use: getconf -a | grep -i name_max.

The default values for the editable parameters are listed in the following table. These parameters all start with:

org.talend.remote.jobserver.commons.config.JobServerConfiguration.

Parameters to improve security in case of malicious archive content
Parameters	Description
`MAX_UNZIPPED_SIZE`	Maximum size for the archive ZIP file that is being extracted during the deployment. The default value is of `1` GB.
`MAX_ZIPPED_ENTRIES`	Number of entries in the archive file. The default maximal value is `2048`.
`MAX_ZIP_NAME_LENGTH`	Length of the archive ZIP file name. The default maximal value is `240` characters.
`MAX_UNZIPPED_FOLDER_NAME_LENGTH`	Length of folder names inside the archive ZIP file. The default maximum length of the unzipped folder name is `240` characters.
`MAX_UNZIPPED_FILE_NAME_LENGTH`	Length of file names inside the archive ZIP file. The default maximal value is `240` characters.
`MAX_ZIP_DEPTH`	Depth limit for folders inside the archive ZIP file. The default value is `64` levels.
`MAX_ARCHIVES_DIR_SIZE`	Size limit for the sum of all archives stored in TalendJobServersFiles/archiveJobs folder. The default size limit is `100`GB.

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