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Add support for setting a custom CSP

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This commit is contained in:
Thomas Sileo 2022-11-09 21:26:43 +01:00
parent a339ff93b1
commit 62c9327500
3 changed files with 23 additions and 4 deletions
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3
app/config.py
View file

@ -109,6 +109,8 @@ class Config(pydantic.BaseModel):
inbox_retention_days: int = 15
custom_content_security_policy: str | None = None
# Config items to make tests easier
sqlalchemy_database: str | None = None
key_path: str | None = None
@ -165,6 +167,7 @@ if CONFIG.privacy_replace:
BLOCKED_SERVERS = {blocked_server.hostname for blocked_server in CONFIG.blocked_servers}
ALSO_KNOWN_AS = CONFIG.also_known_as
CUSTOM_CONTENT_SECURITY_POLICY = CONFIG.custom_content_security_policy
INBOX_RETENTION_DAYS = CONFIG.inbox_retention_days
CUSTOM_FOOTER = (

6
app/main.py
View file

@ -137,10 +137,16 @@ class CustomMiddleware:
headers["x-frame-options"] = "DENY"
headers["permissions-policy"] = "interest-cohort=()"
headers["content-security-policy"] = (
(
f"default-src 'self'; "
f"style-src 'self' 'sha256-{HIGHLIGHT_CSS_HASH}'; "
f"frame-ancestors 'none'; base-uri 'self'; form-action 'self';"
)
if not config.CUSTOM_CONTENT_SECURITY_POLICY
else config.CUSTOM_CONTENT_SECURITY_POLICY.format(
HIGHLIGHT_CSS_HASH=HIGHLIGHT_CSS_HASH
)
)
if not DEBUG:
headers["strict-transport-security"] = "max-age=63072000;"

12
docs/user_guide.md
View file

@ -131,9 +131,19 @@ See `app/scss/main.scss` to see what variables can be overridden.
If you'd like to customize your instance's theme beyond CSS, you can modify the app's HTML by placing templates in `data/templates` which overwrite the defaults in `app/templates`.
#### Custom Content Security Policy (CSP)
You can override the default Content Security Policy by adding a line in `data/profile.toml`:
```toml
custom_content_security_policy = "default-src 'self'; style-src 'self' 'sha256-{HIGHLIGHT_CSS_HASH}'; frame-ancestors 'none'; base-uri 'self'; form-action 'self';"
```
This example will output the default CSP, note that `{HIGHLIGHT_CSS_HASH}` will be dynamically replaced by the correct value (the hash of the CSS needed for syntax highlighting).
#### Code highlighting theme
You can switch to one of the [styles supported by Pygments](https://pygments.org/styles/) by adding a line in `profile.toml`:
You can switch to one of the [styles supported by Pygments](https://pygments.org/styles/) by adding a line in `data/profile.toml`:
```toml
code_highlighting_theme = "solarized-dark"