mirror of
https://codeberg.org/forgejo/forgejo.git
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22aedc6c96
Backport: https://codeberg.org/forgejo/forgejo/pulls/2669 (cherry picked from commit1d3240887c) (cherry picked from commit781a37fbe1) (cherry picked from commit8309f008c2) (cherry picked from commitfae8d9f70d) (cherry picked from commit6721cba75b) (cherry picked from commit562e5cdf32) (cherry picked from commitd789d33229) (cherry picked from commit8218e80bfc) (cherry picked from commit10bca456a9) (cherry picked from commitdb6f6281fc) (cherry picked from commited8e8a792e) (cherry picked from commitd6428f92ce) (cherry picked from commit069d87b80f) (cherry picked from commit2b6546adc9) (cherry picked from commit4c7cb0a5d2) (cherry picked from commit7e0014dd13) (cherry picked from commit16a8658878) (cherry picked from commit6e98bacbbd)
234 lines
9.1 KiB
Go
234 lines
9.1 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// Copyright 2017 The Gogs 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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"io"
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"net/url"
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"regexp"
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"sync"
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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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// Sanitizer is a protection wrapper of *bluemonday.Policy which does not allow
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// any modification to the underlying policies once it's been created.
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type Sanitizer struct {
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defaultPolicy *bluemonday.Policy
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descriptionPolicy *bluemonday.Policy
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rendererPolicies map[string]*bluemonday.Policy
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init sync.Once
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}
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var (
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sanitizer = &Sanitizer{}
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allowAllRegex = regexp.MustCompile(".+")
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)
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// NewSanitizer initializes sanitizer with allowed attributes based on settings.
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// Multiple calls to this function will only create one instance of Sanitizer during
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// entire application lifecycle.
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func NewSanitizer() {
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sanitizer.init.Do(func() {
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InitializeSanitizer()
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})
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}
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// InitializeSanitizer (re)initializes the current sanitizer to account for changes in settings
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func InitializeSanitizer() {
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sanitizer.rendererPolicies = map[string]*bluemonday.Policy{}
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sanitizer.defaultPolicy = createDefaultPolicy()
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sanitizer.descriptionPolicy = createRepoDescriptionPolicy()
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for name, renderer := range renderers {
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sanitizerRules := renderer.SanitizerRules()
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if len(sanitizerRules) > 0 {
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policy := createDefaultPolicy()
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addSanitizerRules(policy, sanitizerRules)
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sanitizer.rendererPolicies[name] = policy
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}
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}
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}
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func createDefaultPolicy() *bluemonday.Policy {
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policy := bluemonday.UGCPolicy()
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// For JS code copy and Mermaid loading state
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^code-block( is-loading)?$`)).OnElements("pre")
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// For color preview
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^color-preview$`)).OnElements("span")
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// For attention
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^attention-header attention-\w+$`)).OnElements("blockquote")
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^attention-\w+$`)).OnElements("strong")
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^attention-icon attention-\w+ svg octicon-[\w-]+$`)).OnElements("svg")
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policy.AllowAttrs("viewBox", "width", "height", "aria-hidden").OnElements("svg")
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policy.AllowAttrs("fill-rule", "d").OnElements("path")
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// For Chroma markdown plugin
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^(chroma )?language-[\w-]+( display)?( is-loading)?$`)).OnElements("code")
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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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// 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(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 anchors
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`ref-issue( ref-external-issue)?`)).OnElements("a")
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// Allow classes for task lists
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`task-list-item`)).OnElements("li")
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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 icons
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^icon(\s+[\p{L}\p{N}_-]+)+$`)).OnElements("i")
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// Allow classes for emojis
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`emoji`)).OnElements("img")
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// Allow icons, emojis, chroma syntax and keyword markup on span
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^((icon(\s+[\p{L}\p{N}_-]+)+)|(emoji)|(language-math display)|(language-math inline))$|^([a-z][a-z0-9]{0,2})$|^` + keywordClass + `$`)).OnElements("span")
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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("span", "p")
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// Allow classes for file preview links...
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^(lines-num|lines-code chroma)$")).OnElements("td")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^code-inner$")).OnElements("code")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^file-preview-box$")).OnElements("div")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^ui table$")).OnElements("div")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^header$")).OnElements("div")
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policy.AllowAttrs("data-line-number").Matching(regexp.MustCompile("^[0-9]+$")).OnElements("span")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^text small grey$")).OnElements("span")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^file-preview*")).OnElements("table")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^lines-escape$")).OnElements("td")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^toggle-escape-button btn interact-bg$")).OnElements("button")
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policy.AllowAttrs("title").OnElements("button")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^ambiguous-code-point$")).OnElements("span")
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policy.AllowAttrs("data-tooltip-content").OnElements("span")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("muted|(text black)")).OnElements("a")
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policy.AllowAttrs("class").Matching(regexp.MustCompile("^ui warning message tw-text-left$")).OnElements("div")
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// Allow generally safe attributes
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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",
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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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policy.AllowAttrs(generalSafeAttrs...).OnElements(generalSafeElements...)
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policy.AllowAttrs("src", "autoplay", "controls").OnElements("video")
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policy.AllowAttrs("itemscope", "itemtype").OnElements("div")
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// FIXME: Need to handle longdesc in img but there is no easy way to do it
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// Custom keyword markup
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addSanitizerRules(policy, setting.ExternalSanitizerRules)
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return policy
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}
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// createRepoDescriptionPolicy returns a minimal more strict policy that is used for
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// repository descriptions.
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func createRepoDescriptionPolicy() *bluemonday.Policy {
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policy := bluemonday.NewPolicy()
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// Allow italics and bold.
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policy.AllowElements("i", "b", "em", "strong")
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// Allow code.
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policy.AllowElements("code")
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// Allow links
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policy.AllowAttrs("href", "target", "rel").OnElements("a")
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// Allow classes for emojis
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^emoji$`)).OnElements("img", "span")
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policy.AllowAttrs("aria-label").OnElements("span")
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return policy
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}
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func addSanitizerRules(policy *bluemonday.Policy, rules []setting.MarkupSanitizerRule) {
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for _, rule := range rules {
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if rule.AllowDataURIImages {
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policy.AllowDataURIImages()
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}
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if rule.Element != "" {
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if rule.Regexp != nil {
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policy.AllowAttrs(rule.AllowAttr).Matching(rule.Regexp).OnElements(rule.Element)
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} else {
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policy.AllowAttrs(rule.AllowAttr).OnElements(rule.Element)
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}
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}
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}
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}
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// SanitizeDescription sanitizes the HTML generated for a repository description.
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func SanitizeDescription(s string) string {
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NewSanitizer()
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return sanitizer.descriptionPolicy.Sanitize(s)
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}
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// Sanitize takes a string that contains a HTML fragment or document and applies policy whitelist.
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func Sanitize(s string) string {
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NewSanitizer()
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return sanitizer.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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NewSanitizer()
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policy, exist := sanitizer.rendererPolicies[renderer]
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if !exist {
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policy = sanitizer.defaultPolicy
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}
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return policy.SanitizeReaderToWriter(r, w)
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}
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