This PR adds support for file integrity monitoring. This is done by providing a simplified API that can be used to PATCH/GET FIM configurations. There is also code to build the FIM configuration to send back to osquery. Each PATCH request, if successful, replaces Fleet's existing FIM configuration. For example:
curl -X "PATCH" "https://localhost:8080/api/v1/kolide/fim" \
-H "Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzZXNzaW9uX2tleSI6IkVhaFhvZWswMGtWSEdaTTNCWndIMnhpYWxkNWZpcVFDR2hEcW1HK2UySmRNOGVFVE1DeTNTaUlFWmhZNUxhdW1ueFZDV2JiR1Bwdm5TKzdyK3NJUzNnPT0ifQ.SDCHAUA1vTuWGjXtcQds2GZLM27HAAiOUhR4WvgvTNY" \
-H "Content-Type: application/json; charset=utf-8" \
-d $'{
"interval": 500,
"file_paths": {
"etc": [
"/etc/%%"
],
"users": [
"/Users/%/Library/%%",
"/Users/%/Documents/%%"
],
"usr": [
"/usr/bin/%%"
]
}
}'
