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Add details on html_sanitizer -> allowed_link_schemes config #17446

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Add details on html_sanitizer -> allowed_link_schemes config #17446

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Stoakes
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@Stoakes Stoakes commented Nov 20, 2022 •
edited by OskarStark
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Hello,

I had hard times getting HTMLSanitizer to work correctly: href attribute was always removed from a tag.

After a bunch of tests and searches, I found that allowed_link_schemes config parameter had to be set.

This behaviour is logical but undocumented, so here is a quick edit to try to make it clearer.

Thanks

PS: As a side note here was my initial (and not working) configuration. Not obvious why href was always removed.

html_sanitizer:
    sanitizers:
        app.sanitizer:
            allow_safe_elements: true
            allow_elements:
                list: '*'
                table: 'class'
                code: '*'
                a: ['href']
            allowed_media_schemes: ['http', 'https', 'mailto']
            allow_relative_medias: false

@OskarStark OskarStark changed the title Add details on html_sanitizer allowed_link_schemes config Add details on html_sanitizer -> allowed_link_schemes config Nov 20, 2022
OskarStark
OskarStark reviewed Nov 20, 2022
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@OskarStark
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friendly ping @tgalopin

@tgalopin
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Allowing href in links is supposed to be the default (it's in the "safe" elements and attributes), this feels like a bug.

I think you should open a bug issue on symfony/symfony instead. To ease the fixing of the bug, the ideal bug issue would be to reproduce the issue in a dedicated repository that I can easily clone and have a look myself. Here, the bug is that by default (without configuration linked to the a element or the href attribute), "a hrefs" should be allowed.

@javiereguiluz javiereguiluz mentioned this pull request Dec 8, 2022
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OK, I've opened the issue symfony/symfony#48556 to handle this, so I'm closing here.

Thanks @Stoakes.

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@Stoakes @OskarStark @tgalopin @javiereguiluz @carsonbot