CSP for Google Tag Manager

marketing

utilities

Using Google Tag Manager with Content Security Policy

The most popular Tag manager in the world - will inject any tag/script into your site, as defined in the Google configurations. Note that it may require you to additionally add 'unsafe-inline' / 'unsafe-eval' based on your usage.

Allow these directives in your CSP, to support Google Tag Manager in your Content Security Policy:

script-src
  https://www.googletagmanager.com
  https://googletagmanager.com
  https://tagmanager.google.com;
style-src
  www.googletagmanager.com
  tagmanager.google.com;
frame-src
  www.googletagmanager.com;
child-src
  www.googletagmanager.com;
img-src
  data:
  www.googletagmanager.com;
font-src
  data:;
connect-src
  www.googletagmanager.com;

The main domains used by Google Tag Manager are:

googletagmanager.com

Sources:

Using Google Tag Manager with Content Security Policy(Offical Docs)

RapidSec CSP Generator(RapidSec Data Network)

Example Content-Security-Policy violations / reports:

Using the above CSP package, will fix these errors that you may be seeing in your console logs:

script-src/script-src-elem/script-src-attrviolations

Refused to load the script 'https://www.googletagmanager.com/gtm.js?id=GTM-*' because it violates the following Content Security Policy directive: "script-src 'self' 'report-sample'". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback.

If you see inline script errors, you need to add SHA-256 hashes / nonces to your CSP with RapidSec:

Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'self' 'report-sample'". Either the 'unsafe-inline' keyword, a hash ('sha256-RFWPLDbv2BY+rCkDzsE+0fr8ylGr2R2faWMhq4lfEQc='), or a nonce ('nonce-...') is required to enable inline execution.

If you see inline eval() errors, RapidSec will generate your CSP with the specific content of the errors:

Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self' 'report-sample'".

style-src/style-src-elem/style-src-attrviolations

Refused to load the stylesheet 'googletagmanager.com' because it violates the following Content Security Policy directive: "style-src 'self' 'report-sample'". Note that 'style-src-elem' was not explicitly set, so 'style-src' is used as a fallback.

If you see inline style errors, you need to add SHA-256 hashes / nonces to your CSP with RapidSec:

Refused to apply inline style because it violates the following Content Security Policy directive: "style-src 'self' 'report-sample'". Either the 'unsafe-inline' keyword, a hash ('sha256-RFWPLDbv2BY+rCkDzsE+0fr8ylGr2R2faWMhq4lfEQc='), or a nonce ('nonce-...') is required to enable inline execution.

font-srcviolations

Refused to load the font 'googletagmanager.com' because it violates the following Content Security Policy directive: "font-src 'self'"

img-srcviolations

Refused to load the image 'googletagmanager.com' because it violates the following Content Security Policy directive: "img-src 'self'".

frame-srcviolations

[Report Only] Refused to frame 'googletagmanager.com' because it violates the following Content Security Policy directive: "frame-src 'self'".

form-actionviolations

[Report Only] Refused to send form data to 'googletagmanager.com' because it violates the following Content Security Policy directive: "form-action 'self'".

connect-srcviolations

[Report Only] Refused to connect to 'googletagmanager.com' because it violates the following Content Security Policy directive: "connect-src 'self'"