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Content Security Policy syntax was invalid 

According to https://csp-evaluator.withgoogle.com/ the CSP built here is NOT valid (and the blob: value is missing at img-src, so the image is not displayed when reading ebook in a browser)

Before this commit, in Chrome response header you can find 

Content-Security-Policy: default-src 'self'  'unsafe-inline' 'unsafe-eval'; font-src 'self' data:; img-src 'self'  data:; object-src: 'none'; blob:;style-src-elem 'self' blob: 'unsafe-inline';

After :

Content-Security-Policy: default-src 'self'  'unsafe-inline' 'unsafe-eval'; font-src 'self' data:; img-src 'self' blob: data:; object-src 'none'  blob:; style-src-elem 'self' blob: 'unsafe-inline';

and image in viewer are displayed
This commit is contained in:
Petipopotam 2023-01-19 19:56:27 +01:00 committed by GitHub
parent e178efb58c
commit ed22209e6c
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1 changed files with 4 additions and 4 deletions
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8
cps/web.py
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@ -82,16 +82,16 @@ except ImportError:
def add_security_headers(resp):
csp = "default-src 'self'"
csp += ''.join([' ' + host for host in config.config_trustedhosts.strip().split(',')])
csp += " 'unsafe-inline' 'unsafe-eval'; font-src 'self' data:; img-src 'self' "
csp += " 'unsafe-inline' 'unsafe-eval'; font-src 'self' data:; img-src 'self' blob:"
if request.path.startswith("/author/") and config.config_use_goodreads:
csp += "images.gr-assets.com i.gr-assets.com s.gr-assets.com"
csp += " images.gr-assets.com i.gr-assets.com s.gr-assets.com"
csp += " data:;"
csp += " object-src: 'none';"
csp += " object-src 'none'"
resp.headers['Content-Security-Policy'] = csp
if request.endpoint == "edit-book.show_edit_book" or config.config_use_google_drive:
resp.headers['Content-Security-Policy'] += " *"
elif request.endpoint == "web.read_book":
resp.headers['Content-Security-Policy'] += " blob:;style-src-elem 'self' blob: 'unsafe-inline';"
resp.headers['Content-Security-Policy'] += " blob:; style-src-elem 'self' blob: 'unsafe-inline';"
resp.headers['X-Content-Type-Options'] = 'nosniff'
resp.headers['X-Frame-Options'] = 'SAMEORIGIN'
resp.headers['X-XSS-Protection'] = '1; mode=block'