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misp-modules/docs/contribute.md

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## How to add your own MISP modules?
Create your module in [misp_modules/modules/expansion/](https://github.com/MISP/misp-modules/tree/master/misp_modules/modules/expansion/), [misp_modules/modules/export_mod/](https://github.com/MISP/misp-modules/tree/master/misp_modules/modules/export_mod/), or [misp_modules/modules/import_mod/](https://github.com/MISP/misp-modules/tree/master/misp_modules/modules/import_mod/). The module should have at minimum three functions:
* **introspection** function that returns a dict of the supported attributes (input and output) by your expansion module.
* **handler** function which accepts a JSON document to expand the values and return a dictionary of the expanded values.
* **version** function that returns a dict with the version and the associated meta-data including potential configurations required of the module.
Don't forget to return an error key and value if an error is raised to propagate it to the MISP user-interface.
Your module's script name should also be added in the `__all__` list of `<module type folder>/__init__.py` in order for it to be loaded.
~~~python
...
# Checking for required value
if not request.get('ip-src'):
# Return an error message
return {'error': "A source IP is required"}
...
~~~
### introspection
The function that returns a dict of the supported attributes (input and output) by your expansion module.
~~~python
mispattributes = {'input': ['link', 'url'],
'output': ['attachment', 'malware-sample']}
def introspection():
return mispattributes
~~~
### version
The function that returns a dict with the version and the associated meta-data including potential configurations required of the module.
### Additional Configuration Values
If your module requires additional configuration (to be exposed via the MISP user-interface), you can define those in the moduleconfig value returned by the version function.
~~~python
# config fields that your code expects from the site admin
moduleconfig = ["apikey", "event_limit"]
def version():
moduleinfo['config'] = moduleconfig
return moduleinfo
~~~
When you do this a config array is added to the meta-data output containing all the potential configuration values:
~~~
"meta": {
"description": "PassiveTotal expansion service to expand values with multiple Passive DNS sources",
"config": [
"username",
"password"
],
"module-type": [
"expansion",
"hover"
],
...
~~~
If you want to use the configuration values set in the web interface they are stored in the key `config` in the JSON object passed to the handler.
~~~
def handler(q=False):
# Check if we were given a configuration
config = q.get("config", {})
# Find out if there is a username field
username = config.get("username", None)
~~~
### handler
The function which accepts a JSON document to expand the values and return a dictionary of the expanded values.
~~~python
def handler(q=False):
"Fully functional rot-13 encoder"
if q is False:
return False
request = json.loads(q)
src = request.get('ip-src')
if src is None:
# Return an error message
return {'error': "A source IP is required"}
else:
return {'results':
codecs.encode(src, "rot-13")}
~~~
#### export module
For an export module, the `request["data"]` object corresponds to a list of events (dictionaries) to handle.
Iterating over events attributes is performed using their `Attribute` key.
~~~python
...
for event in request["data"]:
for attribute in event["Attribute"]:
# do stuff w/ attribute['type'], attribute['value'], ...
...
### Returning Binary Data
If you want to return a file or other data you need to add a data attribute.
~~~python
{"results": {"values": "filename.txt",
"types": "attachment",
"data" : base64.b64encode(<ByteIO>) # base64 encode your data first
"comment": "This is an attachment"}}
~~~
If the binary file is malware you can use 'malware-sample' as the type. If you do this the malware sample will be automatically zipped and password protected ('infected') after being uploaded.
~~~python
{"results": {"values": "filename.txt",
"types": "malware-sample",
"data" : base64.b64encode(<ByteIO>) # base64 encode your data first
"comment": "This is an attachment"}}
~~~
[To learn more about how data attributes are processed you can read the processing code here.](https://github.com/MISP/PyMISP/blob/4f230c9299ad9d2d1c851148c629b61a94f3f117/pymisp/mispevent.py#L185-L200)
### Module type
A MISP module can be of four types:
- **expansion** - service related to an attribute that can be used to extend and update an existing event.
- **hover** - service related to an attribute to provide additional information to the users without updating the event.
- **import** - service related to importing and parsing an external object that can be used to extend an existing event.
- **export** - service related to exporting an object, event, or data.
module-type is an array where the list of supported types can be added.
## Testing your modules?
MISP uses the **modules** function to discover the available MISP modules and their supported MISP attributes:
~~~
% curl -s http://127.0.0.1:6666/modules | jq .
[
{
"name": "passivetotal",
"type": "expansion",
"mispattributes": {
"input": [
"hostname",
"domain",
"ip-src",
"ip-dst"
],
"output": [
"ip-src",
"ip-dst",
"hostname",
"domain"
]
},
"meta": {
"description": "PassiveTotal expansion service to expand values with multiple Passive DNS sources",
"config": [
"username",
"password"
],
"author": "Alexandre Dulaunoy",
"version": "0.1"
}
},
{
"name": "sourcecache",
"type": "expansion",
"mispattributes": {
"input": [
"link"
],
"output": [
"link"
]
},
"meta": {
"description": "Module to cache web pages of analysis reports, OSINT sources. The module returns a link of the cached page.",
"author": "Alexandre Dulaunoy",
"version": "0.1"
}
},
{
"name": "dns",
"type": "expansion",
"mispattributes": {
"input": [
"hostname",
"domain"
],
"output": [
"ip-src",
"ip-dst"
]
},
"meta": {
"description": "Simple DNS expansion service to resolve IP address from MISP attributes",
"author": "Alexandre Dulaunoy",
"version": "0.1"
}
}
]
~~~
The MISP module service returns the available modules in a JSON array containing each module name along with their supported input attributes.
Based on this information, a query can be built in a JSON format and saved as body.json:
~~~json
{
"hostname": "www.foo.be",
"module": "dns"
}
~~~
Then you can POST this JSON format query towards the MISP object server:
~~~bash
curl -s http://127.0.0.1:6666/query -H "Content-Type: application/json" --data @body.json -X POST
~~~
The module should output the following JSON:
~~~json
{
"results": [
{
"types": [
"ip-src",
"ip-dst"
],
"values": [
"188.65.217.78"
]
}
]
}
~~~
It is also possible to restrict the category options of the resolved attributes by passing a list of categories along (optional):
~~~json
{
"results": [
{
"types": [
"ip-src",
"ip-dst"
],
"values": [
"188.65.217.78"
],
"categories": [
"Network activity",
"Payload delivery"
]
}
]
}
~~~
For both the type and the category lists, the first item in the list will be the default setting on the interface.
### Enable your module in the web interface
For a module to be activated in the MISP web interface it must be enabled in the "Plugin Settings.
Go to "Administration > Server Settings" in the top menu
- Go to "Plugin Settings" in the top "tab menu bar"
- Click on the name of the type of module you have created to expand the list of plugins to show your module.
- Find the name of your plugin's "enabled" value in the Setting Column.
"Plugin.[MODULE NAME]_enabled"
- Double click on its "Value" column
~~~
Priority Setting Value Description Error Message
Recommended Plugin.Import_ocr_enabled false Enable or disable the ocr module. Value not set.
~~~
- Use the drop-down to set the enabled value to 'true'
~~~
Priority Setting Value Description Error Message
Recommended Plugin.Import_ocr_enabled true Enable or disable the ocr module. Value not set.
~~~
### Set any other required settings for your module
In this same menu set any other plugin settings that are required for testing.
## Documentation
In order to provide documentation about some modules that require specific input / output / configuration, the [doc](https://github.com/MISP/misp-modules/tree/master/doc) directory contains detailed information about the general purpose, requirements, features, input and output of each of these modules:
- ***description** - quick description of the general purpose of the module, as the one given by the moduleinfo
- **requirements** - special libraries needed to make the module work
- **features** - description of the way to use the module, with the required MISP features to make the module give the intended result
- **references** - link(s) giving additional information about the format concerned in the module
- **input** - description of the format of data used in input
- **output** - description of the format given as the result of the module execution
In addition to the module documentation please add your module to [docs/index.md](https://github.com/MISP/misp-modules/tree/master/docs/index.md).
There are also [complementary slides](https://www.misp-project.org/misp-training/3.1-misp-modules.pdf) for the creation of MISP modules.
## Tips for developers creating modules
Download a pre-built virtual image from the [MISP training materials](https://www.circl.lu/services/misp-training-materials/).
- Create a Host-Only adapter in VirtualBox
- Set your Misp OVA to that Host-Only adapter
- Start the virtual machine
- Get the IP address of the virutal machine
- SSH into the machine (Login info on training page)
- Go into the misp-modules directory
~~~bash
cd /usr/local/src/misp-modules
~~~
Set the git repo to your fork and checkout your development branch. If you SSH'ed in as the misp user you will have to use sudo.
~~~bash
sudo git remote set-url origin https://github.com/YourRepo/misp-modules.git
sudo git pull
sudo git checkout MyModBranch
~~~
Remove the contents of the build directory and re-install misp-modules.
~~~python
sudo rm -fr build/*
sudo pip3 install --upgrade .
~~~
SSH in with a different terminal and run `misp-modules` with debugging enabled.
~~~python
sudo killall misp-modules
misp-modules -d
~~~
In your original terminal you can now run your tests manually and see any errors that arrive
~~~bash
cd tests/
curl -s http://127.0.0.1:6666/query -H "Content-Type: application/json" --data @MY_TEST_FILE.json -X POST
cd ../
~~~
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