Add sanitizer rules per renderer (#16110)
* Added sanitizer rules per renderer. * Updated documentation. Co-authored-by: techknowlogick <techknowlogick@gitea.io>
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10 changed files with 215 additions and 113 deletions
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@ -907,13 +907,17 @@ Gitea supports customizing the sanitization policy for rendered HTML. The exampl
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ELEMENT = span
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ALLOW_ATTR = class
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REGEXP = ^\s*((math(\s+|$)|inline(\s+|$)|display(\s+|$)))+
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ALLOW_DATA_URI_IMAGES = true
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```
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- `ELEMENT`: The element this policy applies to. Must be non-empty.
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- `ALLOW_ATTR`: The attribute this policy allows. Must be non-empty.
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- `REGEXP`: A regex to match the contents of the attribute against. Must be present but may be empty for unconditional whitelisting of this attribute.
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- `ALLOW_DATA_URI_IMAGES`: **false** Allow data uri images (`<img src="data:image/png;base64,..."/>`).
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Multiple sanitisation rules can be defined by adding unique subsections, e.g. `[markup.sanitizer.TeX-2]`.
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To apply a sanitisation rules only for a specify external renderer they must use the renderer name, e.g. `[markup.sanitizer.asciidoc.rule-1]`.
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If the rule is defined above the renderer ini section or the name does not match a renderer it is applied to every renderer.
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## Time (`time`)
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@ -64,8 +64,8 @@ IS_INPUT_FILE = false
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[markup.jupyter]
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ENABLED = true
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FILE_EXTENSIONS = .ipynb
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RENDER_COMMAND = "jupyter nbconvert --stdout --to html --template basic "
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IS_INPUT_FILE = true
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RENDER_COMMAND = "jupyter nbconvert --stdin --stdout --to html --template basic"
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IS_INPUT_FILE = false
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[markup.restructuredtext]
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ENABLED = true
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@ -90,15 +90,50 @@ FILE_EXTENSIONS = .md,.markdown
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RENDER_COMMAND = pandoc -f markdown -t html --katex
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```
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You must define `ELEMENT`, `ALLOW_ATTR`, and `REGEXP` in each section.
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You must define `ELEMENT` and `ALLOW_ATTR` in each section.
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To define multiple entries, add a unique alphanumeric suffix (e.g., `[markup.sanitizer.1]` and `[markup.sanitizer.something]`).
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To apply a sanitisation rules only for a specify external renderer they must use the renderer name, e.g. `[markup.sanitizer.asciidoc.rule-1]`, `[markup.sanitizer.<renderer>.rule-1]`.
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**Note**: If the rule is defined above the renderer ini section or the name does not match a renderer it is applied to every renderer.
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Once your configuration changes have been made, restart Gitea to have changes take effect.
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**Note**: Prior to Gitea 1.12 there was a single `markup.sanitiser` section with keys that were redefined for multiple rules, however,
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there were significant problems with this method of configuration necessitating configuration through multiple sections.
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### Example: Office DOCX
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Display Office DOCX files with [`pandoc`](https://pandoc.org/):
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```ini
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[markup.docx]
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ENABLED = true
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FILE_EXTENSIONS = .docx
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RENDER_COMMAND = "pandoc --from docx --to html --self-contained --template /path/to/basic.html"
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[markup.sanitizer.docx.img]
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ALLOW_DATA_URI_IMAGES = true
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```
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The template file has the following content:
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```
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$body$
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```
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### Example: Jupyter Notebook
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Display Jupyter Notebook files with [`nbconvert`](https://github.com/jupyter/nbconvert):
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```ini
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[markup.jupyter]
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ENABLED = true
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FILE_EXTENSIONS = .ipynb
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RENDER_COMMAND = "jupyter-nbconvert --stdin --stdout --to html --template basic"
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[markup.sanitizer.jupyter.img]
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ALLOW_DATA_URI_IMAGES = true
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```
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## Customizing CSS
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The external renderer is specified in the .ini in the format `[markup.XXXXX]` and the HTML supplied by your external renderer will be wrapped in a `<div>` with classes `markup` and `XXXXX`. The `markup` class provides out of the box styling (as does `markdown` if `XXXXX` is `markdown`). Otherwise you can use these classes to specifically target the contents of your rendered HTML.
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@ -10,6 +10,7 @@ import (
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"html"
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"io"
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"io/ioutil"
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"regexp"
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"strconv"
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"code.gitea.io/gitea/modules/csv"
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@ -38,6 +39,15 @@ func (Renderer) Extensions() []string {
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return []string{".csv", ".tsv"}
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}
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// SanitizerRules implements markup.Renderer
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func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
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return []setting.MarkupSanitizerRule{
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{Element: "table", AllowAttr: "class", Regexp: regexp.MustCompile(`data-table`)},
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{Element: "th", AllowAttr: "class", Regexp: regexp.MustCompile(`line-num`)},
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{Element: "td", AllowAttr: "class", Regexp: regexp.MustCompile(`line-num`)},
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}
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}
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func writeField(w io.Writer, element, class, field string) error {
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if _, err := io.WriteString(w, "<"); err != nil {
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return err
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7
modules/markup/external/external.go
vendored
7
modules/markup/external/external.go
vendored
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@ -30,7 +30,7 @@ func RegisterRenderers() {
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// Renderer implements markup.Renderer for external tools
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type Renderer struct {
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setting.MarkupRenderer
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*setting.MarkupRenderer
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}
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// Name returns the external tool name
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@ -48,6 +48,11 @@ func (p *Renderer) Extensions() []string {
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return p.FileExtensions
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}
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// SanitizerRules implements markup.Renderer
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func (p *Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
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return p.MarkupSanitizerRules
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}
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func envMark(envName string) string {
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if runtime.GOOS == "windows" {
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return "%" + envName + "%"
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@ -112,7 +112,7 @@ func TestRender_links(t *testing.T) {
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defaultCustom := setting.Markdown.CustomURLSchemes
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setting.Markdown.CustomURLSchemes = []string{"ftp", "magnet"}
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ReplaceSanitizer()
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InitializeSanitizer()
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CustomLinkURLSchemes(setting.Markdown.CustomURLSchemes)
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test(
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@ -192,7 +192,7 @@ func TestRender_links(t *testing.T) {
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// Restore previous settings
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setting.Markdown.CustomURLSchemes = defaultCustom
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ReplaceSanitizer()
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InitializeSanitizer()
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CustomLinkURLSchemes(setting.Markdown.CustomURLSchemes)
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}
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@ -199,7 +199,7 @@ func actualRender(ctx *markup.RenderContext, input io.Reader, output io.Writer)
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}
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_ = lw.Close()
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}()
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buf := markup.SanitizeReader(rd)
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buf := markup.SanitizeReader(rd, "")
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_, err := io.Copy(output, buf)
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return err
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}
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@ -215,7 +215,7 @@ func render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error
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if log.IsDebug() {
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log.Debug("Panic in markdown: %v\n%s", err, string(log.Stack(2)))
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}
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ret := markup.SanitizeReader(input)
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ret := markup.SanitizeReader(input, "")
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_, err = io.Copy(output, ret)
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if err != nil {
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log.Error("SanitizeReader failed: %v", err)
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@ -249,6 +249,11 @@ func (Renderer) Extensions() []string {
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return setting.Markdown.FileExtensions
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}
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// SanitizerRules implements markup.Renderer
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func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
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return []setting.MarkupSanitizerRule{}
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}
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// Render implements markup.Renderer
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func (Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
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return render(ctx, input, output)
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@ -13,6 +13,7 @@ import (
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"code.gitea.io/gitea/modules/highlight"
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"code.gitea.io/gitea/modules/markup"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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"github.com/alecthomas/chroma"
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@ -41,6 +42,11 @@ func (Renderer) Extensions() []string {
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return []string{".org"}
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}
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// SanitizerRules implements markup.Renderer
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func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
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return []setting.MarkupSanitizerRule{}
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}
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// Render renders orgmode rawbytes to HTML
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func Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
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htmlWriter := org.NewHTMLWriter()
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@ -81,6 +81,7 @@ type Renderer interface {
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Name() string // markup format name
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Extensions() []string
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NeedPostProcess() bool
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SanitizerRules() []setting.MarkupSanitizerRule
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Render(ctx *RenderContext, input io.Reader, output io.Writer) error
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}
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@ -136,7 +137,6 @@ func render(ctx *RenderContext, renderer Renderer, input io.Reader, output io.Wr
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_ = pw.Close()
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}()
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if renderer.NeedPostProcess() {
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pr2, pw2 := io.Pipe()
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defer func() {
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_ = pr2.Close()
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@ -145,7 +145,7 @@ func render(ctx *RenderContext, renderer Renderer, input io.Reader, output io.Wr
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wg.Add(1)
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go func() {
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buf := SanitizeReader(pr2)
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buf := SanitizeReader(pr2, renderer.Name())
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_, err = io.Copy(output, buf)
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_ = pr2.Close()
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wg.Done()
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@ -153,20 +153,16 @@ func render(ctx *RenderContext, renderer Renderer, input io.Reader, output io.Wr
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wg.Add(1)
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go func() {
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if renderer.NeedPostProcess() {
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err = PostProcess(ctx, pr, pw2)
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} else {
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_, err = io.Copy(pw2, pr)
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}
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_ = pr.Close()
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_ = pw2.Close()
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wg.Done()
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}()
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} else {
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wg.Add(1)
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go func() {
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buf := SanitizeReader(pr)
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_, err = io.Copy(output, buf)
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_ = pr.Close()
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wg.Done()
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}()
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}
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if err1 := renderer.Render(ctx, input, pw); err1 != nil {
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return err1
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}
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@ -19,7 +19,8 @@ import (
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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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policy *bluemonday.Policy
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defaultPolicy *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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@ -30,47 +31,57 @@ var sanitizer = &Sanitizer{}
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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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ReplaceSanitizer()
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InitializeSanitizer()
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})
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}
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// ReplaceSanitizer replaces the current sanitizer to account for changes in settings
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func ReplaceSanitizer() {
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sanitizer.policy = bluemonday.UGCPolicy()
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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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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 Chroma markdown plugin
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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`^is-loading$`)).OnElements("pre")
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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`^(chroma )?language-[\w-]+$`)).OnElements("code")
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^is-loading$`)).OnElements("pre")
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^(chroma )?language-[\w-]+$`)).OnElements("code")
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// Checkboxes
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sanitizer.policy.AllowAttrs("type").Matching(regexp.MustCompile(`^checkbox$`)).OnElements("input")
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sanitizer.policy.AllowAttrs("checked", "disabled", "data-source-position").OnElements("input")
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policy.AllowAttrs("type").Matching(regexp.MustCompile(`^checkbox$`)).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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sanitizer.policy.AllowURLSchemes(setting.Markdown.CustomURLSchemes...)
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policy.AllowURLSchemes(setting.Markdown.CustomURLSchemes...)
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}
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// Allow classes for anchors
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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`ref-issue`)).OnElements("a")
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`ref-issue`)).OnElements("a")
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// Allow classes for task lists
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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`task-list-item`)).OnElements("li")
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`task-list-item`)).OnElements("li")
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// Allow icons
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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`^icon(\s+[\p{L}\p{N}_-]+)+$`)).OnElements("i")
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^icon(\s+[\p{L}\p{N}_-]+)+$`)).OnElements("i")
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// Allow unlabelled labels
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sanitizer.policy.AllowNoAttrs().OnElements("label")
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policy.AllowNoAttrs().OnElements("label")
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// Allow classes for emojis
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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`emoji`)).OnElements("img")
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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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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`^((icon(\s+[\p{L}\p{N}_-]+)+)|(emoji))$|^([a-z][a-z0-9]{0,2})$|^` + keywordClass + `$`)).OnElements("span")
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// Allow data tables
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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`data-table`)).OnElements("table")
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sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`line-num`)).OnElements("th", "td")
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policy.AllowAttrs("class").Matching(regexp.MustCompile(`^((icon(\s+[\p{L}\p{N}_-]+)+)|(emoji))$|^([a-z][a-z0-9]{0,2})$|^` + keywordClass + `$`)).OnElements("span")
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// Allow generally safe attributes
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generalSafeAttrs := []string{"abbr", "accept", "accept-charset",
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@ -101,18 +112,29 @@ func ReplaceSanitizer() {
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"abbr", "bdo", "cite", "dfn", "mark", "small", "span", "time", "wbr",
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}
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sanitizer.policy.AllowAttrs(generalSafeAttrs...).OnElements(generalSafeElements...)
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policy.AllowAttrs(generalSafeAttrs...).OnElements(generalSafeElements...)
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sanitizer.policy.AllowAttrs("itemscope", "itemtype").OnElements("div")
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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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for _, rule := range setting.ExternalSanitizerRules {
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addSanitizerRules(policy, setting.ExternalSanitizerRules)
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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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sanitizer.policy.AllowAttrs(rule.AllowAttr).Matching(rule.Regexp).OnElements(rule.Element)
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policy.AllowAttrs(rule.AllowAttr).Matching(rule.Regexp).OnElements(rule.Element)
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} else {
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sanitizer.policy.AllowAttrs(rule.AllowAttr).OnElements(rule.Element)
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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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@ -120,11 +142,15 @@ func ReplaceSanitizer() {
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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.policy.Sanitize(s)
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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) *bytes.Buffer {
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func SanitizeReader(r io.Reader, renderer string) *bytes.Buffer {
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NewSanitizer()
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return sanitizer.policy.SanitizeReader(r)
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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.SanitizeReader(r)
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}
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@ -15,7 +15,7 @@ import (
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// ExternalMarkupRenderers represents the external markup renderers
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var (
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ExternalMarkupRenderers []MarkupRenderer
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ExternalMarkupRenderers []*MarkupRenderer
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ExternalSanitizerRules []MarkupSanitizerRule
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)
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@ -27,6 +27,7 @@ type MarkupRenderer struct {
|
|||
FileExtensions []string
|
||||
IsInputFile bool
|
||||
NeedPostProcess bool
|
||||
MarkupSanitizerRules []MarkupSanitizerRule
|
||||
}
|
||||
|
||||
// MarkupSanitizerRule defines the policy for whitelisting attributes on
|
||||
|
|
@ -35,11 +36,13 @@ type MarkupSanitizerRule struct {
|
|||
Element string
|
||||
AllowAttr string
|
||||
Regexp *regexp.Regexp
|
||||
AllowDataURIImages bool
|
||||
}
|
||||
|
||||
func newMarkup() {
|
||||
ExternalMarkupRenderers = make([]MarkupRenderer, 0, 10)
|
||||
ExternalMarkupRenderers = make([]*MarkupRenderer, 0, 10)
|
||||
ExternalSanitizerRules = make([]MarkupSanitizerRule, 0, 10)
|
||||
|
||||
for _, sec := range Cfg.Section("markup").ChildSections() {
|
||||
name := strings.TrimPrefix(sec.Name(), "markup.")
|
||||
if name == "" {
|
||||
|
|
@ -56,50 +59,62 @@ func newMarkup() {
|
|||
}
|
||||
|
||||
func newMarkupSanitizer(name string, sec *ini.Section) {
|
||||
haveElement := sec.HasKey("ELEMENT")
|
||||
haveAttr := sec.HasKey("ALLOW_ATTR")
|
||||
haveRegexp := sec.HasKey("REGEXP")
|
||||
|
||||
if !haveElement && !haveAttr && !haveRegexp {
|
||||
log.Warn("Skipping empty section: markup.%s.", name)
|
||||
rule, ok := createMarkupSanitizerRule(name, sec)
|
||||
if ok {
|
||||
if strings.HasPrefix(name, "sanitizer.") {
|
||||
names := strings.SplitN(strings.TrimPrefix(name, "sanitizer."), ".", 2)
|
||||
name = names[0]
|
||||
}
|
||||
for _, renderer := range ExternalMarkupRenderers {
|
||||
if name == renderer.MarkupName {
|
||||
renderer.MarkupSanitizerRules = append(renderer.MarkupSanitizerRules, rule)
|
||||
return
|
||||
}
|
||||
|
||||
if !haveElement || !haveAttr || !haveRegexp {
|
||||
log.Error("Missing required keys from markup.%s. Must have all three of ELEMENT, ALLOW_ATTR, and REGEXP defined!", name)
|
||||
return
|
||||
}
|
||||
|
||||
elements := sec.Key("ELEMENT").Value()
|
||||
allowAttrs := sec.Key("ALLOW_ATTR").Value()
|
||||
regexpStr := sec.Key("REGEXP").Value()
|
||||
|
||||
if regexpStr == "" {
|
||||
rule := MarkupSanitizerRule{
|
||||
Element: elements,
|
||||
AllowAttr: allowAttrs,
|
||||
Regexp: nil,
|
||||
}
|
||||
|
||||
ExternalSanitizerRules = append(ExternalSanitizerRules, rule)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func createMarkupSanitizerRule(name string, sec *ini.Section) (MarkupSanitizerRule, bool) {
|
||||
var rule MarkupSanitizerRule
|
||||
|
||||
ok := false
|
||||
if sec.HasKey("ALLOW_DATA_URI_IMAGES") {
|
||||
rule.AllowDataURIImages = sec.Key("ALLOW_DATA_URI_IMAGES").MustBool(false)
|
||||
ok = true
|
||||
}
|
||||
|
||||
if sec.HasKey("ELEMENT") || sec.HasKey("ALLOW_ATTR") {
|
||||
rule.Element = sec.Key("ELEMENT").Value()
|
||||
rule.AllowAttr = sec.Key("ALLOW_ATTR").Value()
|
||||
|
||||
if rule.Element == "" || rule.AllowAttr == "" {
|
||||
log.Error("Missing required values from markup.%s. Must have ELEMENT and ALLOW_ATTR defined!", name)
|
||||
return rule, false
|
||||
}
|
||||
|
||||
regexpStr := sec.Key("REGEXP").Value()
|
||||
if regexpStr != "" {
|
||||
// Validate when parsing the config that this is a valid regular
|
||||
// expression. Then we can use regexp.MustCompile(...) later.
|
||||
compiled, err := regexp.Compile(regexpStr)
|
||||
if err != nil {
|
||||
log.Error("In module.%s: REGEXP (%s) at definition %d failed to compile: %v", regexpStr, name, err)
|
||||
return
|
||||
log.Error("In markup.%s: REGEXP (%s) failed to compile: %v", name, regexpStr, err)
|
||||
return rule, false
|
||||
}
|
||||
|
||||
rule := MarkupSanitizerRule{
|
||||
Element: elements,
|
||||
AllowAttr: allowAttrs,
|
||||
Regexp: compiled,
|
||||
rule.Regexp = compiled
|
||||
}
|
||||
|
||||
ExternalSanitizerRules = append(ExternalSanitizerRules, rule)
|
||||
ok = true
|
||||
}
|
||||
|
||||
if !ok {
|
||||
log.Error("Missing required keys from markup.%s. Must have ELEMENT and ALLOW_ATTR or ALLOW_DATA_URI_IMAGES defined!", name)
|
||||
return rule, false
|
||||
}
|
||||
|
||||
return rule, true
|
||||
}
|
||||
|
||||
func newMarkupRenderer(name string, sec *ini.Section) {
|
||||
|
|
@ -126,7 +141,7 @@ func newMarkupRenderer(name string, sec *ini.Section) {
|
|||
return
|
||||
}
|
||||
|
||||
ExternalMarkupRenderers = append(ExternalMarkupRenderers, MarkupRenderer{
|
||||
ExternalMarkupRenderers = append(ExternalMarkupRenderers, &MarkupRenderer{
|
||||
Enabled: sec.Key("ENABLED").MustBool(false),
|
||||
MarkupName: name,
|
||||
FileExtensions: exts,
|
||||
|
|
|
|||
Reference in a new issue