Reference: Authenticated Resource Locator

Overview

Many features in LimaCharlie require access to external resources, sometimes authenticated, provided by users.

Authenticated Resource Locators (ARLs) describe a way to specify access to a remote resource, supporting many methods, including authentication data, and all that within a single string.

Format

With authentication

[methodName,methodDest,authType,authData]

Without authentication

[methodName,methodDest]

• methodName: the transport to use, one of http, https, gcs and github.

• methodDest: the actual destination of the transport. A domain and path for HTTP(S) and a bucket name and path for GCS.

• authType: how to authenticate, one of basic, bearer, token, gaia or otx.

• authData: the auth data, like username:password for basic, or access token values. If the value is a complex structure, like a gaia JSON service key, it must be base64-encoded.

Examples

HTTP GET with no auth

[https,my.corpwebsite.com/resourdata]

HTTP GET with basic auth

[https,my.corpwebsite.com/resourdata,basic,myusername:mypassword]

HTTP GET with bearer auth

[https,my.corpwebsite.com/resourdata,bearer,bfuihferhf8erh7ubhfey7g3y4bfurbfhrb]

HTTP GET with token auth

[https,my.corpwebsite.com/resourdata,token,bfuihferhf8erh7ubhfey7g3y4bfurbfhrb]

Retrieve from Google Cloud Storage

[gcs,my-bucket-name/some-blob-prefix,gaia,base64(GCP_SERVICE_KEY)]

Retrieve OTX Pulse via REST API

[https,otx.alienvault.com/api/v1/pulses/5dc56c60a9edbde72dd5d013,otx,9uhr438uhf4h4u9fj7f6the8h383v8jv4ccc1e263d37f29d034d]

Retrieve from public GitHub repo main branch

[github,myGithubUserOrOrg/repoName/path/to/file]

Note: The path to the repo is NOT the same as the URL. Utilize the UI breadcrumbs for the correct path.
For example, in the following screenshot:

The GitHub user is: romainmarcoux
The repo name is: malicious-domains
The path is: sources/alienvault-phishing-scam
So the ARL would be:  [github,romainmarcoux/malicious-domains/sources/alienvault-phishing-scam]

Retrieve from GitHub repo with Github Personal Access Token

[github,myGithubUserOrOrg/repoName/optional/subpath/to,token,f1eb898f20a0db07e88878aadfsdfdfsffdsdfadwq8f767a72218f2]

Retrieve from public GitHub repo at a specific branch

[github,refractionPOINT/sigma/some-sub-dir?ref=my-branch]