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26d83c932a
The banner allows site operators to communicate important announcements (e.g., maintenance windows, policy updates, service notices) directly within the UI. The maintenance mode only allows admin to access the web UI. * Fix #2345 * Fix #9618 --------- Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
112 lines
4.3 KiB
Go
112 lines
4.3 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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// Line numbers on codepreview
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policy.AllowAttrs("data-line-number").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", "center", "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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