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109 lines
4.2 KiB
Go
109 lines
4.2 KiB
Go
// Copyright 2024 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package markup
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import (
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"html/template"
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"io"
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"net/url"
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"regexp"
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"code.gitea.io/gitea/modules/setting"
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"github.com/microcosm-cc/bluemonday"
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)
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func (st *Sanitizer) createDefaultPolicy() *bluemonday.Policy {
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policy := bluemonday.UGCPolicy()
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// NOTICE: DO NOT add special "class" regexp rules here anymore, use RenderInternal.SafeAttr instead
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// General safe SVG attributes
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policy.AllowAttrs("viewBox", "width", "height", "aria-hidden", "data-attr-class").OnElements("svg")
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policy.AllowAttrs("fill-rule", "d").OnElements("path")
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// Checkboxes
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policy.AllowAttrs("type").Matching(regexp.MustCompile(`^checkbox$`)).OnElements("input")
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policy.AllowAttrs("checked", "disabled", "data-source-position").OnElements("input")
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// Chroma always uses 1-2 letters for style names, we could tolerate it at the moment
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^\w{0,2}$`)).OnElements("span")
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// Custom URL-Schemes
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if len(setting.Markdown.CustomURLSchemes) > 0 {
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policy.AllowURLSchemes(setting.Markdown.CustomURLSchemes...)
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} else {
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policy.AllowURLSchemesMatching(st.allowAllRegex)
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// Even if every scheme is allowed, these three are blocked for security reasons
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disallowScheme := func(*url.URL) bool {
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return false
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}
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policy.AllowURLSchemeWithCustomPolicy("javascript", disallowScheme)
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policy.AllowURLSchemeWithCustomPolicy("vbscript", disallowScheme)
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policy.AllowURLSchemeWithCustomPolicy("data", disallowScheme)
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}
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// Allow classes for org mode list item status.
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^(unchecked|checked|indeterminate)$`)).OnElements("li")
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// Allow 'color' and 'background-color' properties for the style attribute on text elements.
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policy.AllowStyles("color", "background-color").OnElements("div", "span", "p", "tr", "th", "td")
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policy.AllowAttrs("src", "autoplay", "controls").OnElements("video")
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policy.AllowAttrs("loading").OnElements("img")
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// Allow generally safe attributes (reference: https://github.com/jch/html-pipeline)
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generalSafeAttrs := []string{
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"abbr", "accept", "accept-charset",
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"accesskey", "action", "align", "alt",
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"aria-describedby", "aria-hidden", "aria-label", "aria-labelledby",
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"axis", "border", "cellpadding", "cellspacing", "char",
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"charoff", "charset", "checked",
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"clear", "cols", "colspan", "color",
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"compact", "coords", "datetime", "dir",
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"disabled", "enctype", "for", "frame",
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"headers", "height", "hreflang",
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"hspace", "ismap", "label", "lang",
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"maxlength", "media", "method",
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"multiple", "name", "nohref", "noshade",
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"nowrap", "open", "prompt", "readonly", "rel", "rev",
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"rows", "rowspan", "rules", "scope",
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"selected", "shape", "size", "span",
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"start", "summary", "tabindex", "target",
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"title", "type", "usemap", "valign", "value",
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"vspace", "width", "itemprop", "itemscope", "itemtype",
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"data-markdown-generated-content", "data-attr-class",
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}
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generalSafeElements := []string{
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"h1", "h2", "h3", "h4", "h5", "h6", "h7", "h8", "br", "b", "i", "strong", "em", "a", "pre", "code", "img", "tt",
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"div", "ins", "del", "sup", "sub", "p", "ol", "ul", "table", "thead", "tbody", "tfoot", "blockquote", "label",
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"dl", "dt", "dd", "kbd", "q", "samp", "var", "hr", "ruby", "rt", "rp", "li", "tr", "td", "th", "s", "strike", "summary",
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"details", "caption", "figure", "figcaption",
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"abbr", "bdo", "cite", "dfn", "mark", "small", "span", "time", "video", "wbr",
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}
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// FIXME: Need to handle longdesc in img but there is no easy way to do it
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policy.AllowAttrs(generalSafeAttrs...).OnElements(generalSafeElements...)
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// Custom keyword markup
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defaultSanitizer.addSanitizerRules(policy, setting.ExternalSanitizerRules)
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return policy
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}
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// Sanitize use default sanitizer policy to sanitize a string
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func Sanitize(s string) template.HTML {
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return template.HTML(GetDefaultSanitizer().defaultPolicy.Sanitize(s))
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}
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// SanitizeReader sanitizes a Reader
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func SanitizeReader(r io.Reader, renderer string, w io.Writer) error {
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policy, exist := GetDefaultSanitizer().rendererPolicies[renderer]
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if !exist {
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policy = GetDefaultSanitizer().defaultPolicy
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}
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return policy.SanitizeReaderToWriter(r, w)
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}
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