# GCP - Cloud Functions Unauthenticated Enum
{% hint style="success" %}
Learn & practice AWS Hacking: (1) (1) (1).png)
[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\
Learn & practice GCP Hacking:  (1).png)
[**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
Support HackTricks
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
{% endhint %}
## Cloud Functions
More information about Cloud Functions can be found in:
{% content-ref url="../gcp-services/gcp-cloud-functions-enum.md" %}
[gcp-cloud-functions-enum.md](../gcp-services/gcp-cloud-functions-enum.md)
{% endcontent-ref %}
### Brute Force URls
**Brute Force the URL format**:
* `https://-.cloudfunctions.net/`
It's easier if you know project names.
Check this page for some tools to perform this brute force:
{% content-ref url="./" %}
[.](./)
{% endcontent-ref %}
### Enumerate Open Cloud Functions
With the following code [taken from here](https://gitlab.com/gitlab-com/gl-security/security-operations/gl-redteam/gcp_misc/-/blob/master/find_open_functions.sh) you can find Cloud Functions that permit unauthenticated invocations.
```bash
#!/bin/bash
############################
# Run this tool to find Cloud Functions that permit unauthenticated invocations
# anywhere in your GCP organization.
# Enjoy!
############################
for proj in $(gcloud projects list --format="get(projectId)"); do
echo "[*] scraping project $proj"
enabled=$(gcloud services list --project "$proj" | grep "Cloud Functions API")
if [ -z "$enabled" ]; then
continue
fi
for func_region in $(gcloud functions list --quiet --project "$proj" --format="value[separator=','](NAME,REGION)"); do
# drop substring from first occurence of "," to end of string.
func="${func_region%%,*}"
# drop substring from start of string up to last occurence of ","
region="${func_region##*,}"
ACL="$(gcloud functions get-iam-policy "$func" --project "$proj" --region "$region")"
all_users="$(echo "$ACL" | grep allUsers)"
all_auth="$(echo "$ACL" | grep allAuthenticatedUsers)"
if [ -z "$all_users" ]
then
:
else
echo "[!] Open to all users: $proj: $func"
fi
if [ -z "$all_auth" ]
then
:
else
echo "[!] Open to all authenticated users: $proj: $func"
fi
done
done
```
{% hint style="success" %}
Learn & practice AWS Hacking:[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\
Learn & practice GCP Hacking: [**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
Support HackTricks
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
{% endhint %}