gitea/modules/markup/sanitizer_default.go
wxiaoguang 8a20fba8eb
Refactor markup render system (#32533)
Remove unmaintainable sanitizer rules. No need to add special "class"
regexp rules anymore, use RenderInternal.SafeAttr instead, more details
(and examples) are in the tests
2024-11-18 13:25:42 +08:00

103 lines
3.9 KiB
Go

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