sanitize html for statuses + instance (#97)

* sanitize html for statuses + instance

* sanitization

internal/processing/account/create.go

@@ -23,6 +23,7 @@ import (
 
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
 	"github.com/superseriousbusiness/oauth2/v4"
 )
 
@@ -44,7 +45,7 @@ func (p *processor) Create(applicationToken oauth2.TokenInfo, application *gtsmo
 	}
 
 	l.Trace("creating new username and account")
-	user, err := p.db.NewSignup(form.Username, reason, p.config.AccountsConfig.RequireApproval, form.Email, form.Password, form.IP, form.Locale, application.ID)
+	user, err := p.db.NewSignup(form.Username, util.RemoveHTML(reason), p.config.AccountsConfig.RequireApproval, form.Email, form.Password, form.IP, form.Locale, application.ID)
 	if err != nil {
 		return nil, fmt.Errorf("error creating new signup in the database: %s", err)
 	}

internal/processing/account/update.go

@@ -50,7 +50,8 @@ func (p *processor) Update(account *gtsmodel.Account, form *apimodel.UpdateCrede
 		if err := util.ValidateDisplayName(*form.DisplayName); err != nil {
 			return nil, err
 		}
-		if err := p.db.UpdateOneByID(account.ID, "display_name", *form.DisplayName, &gtsmodel.Account{}); err != nil {
+		displayName := util.RemoveHTML(*form.DisplayName) // no html allowed in display name
+		if err := p.db.UpdateOneByID(account.ID, "display_name", displayName, &gtsmodel.Account{}); err != nil {
 			return nil, err
 		}
 	}
@@ -59,7 +60,8 @@ func (p *processor) Update(account *gtsmodel.Account, form *apimodel.UpdateCrede
 		if err := util.ValidateNote(*form.Note); err != nil {
 			return nil, err
 		}
-		if err := p.db.UpdateOneByID(account.ID, "note", *form.Note, &gtsmodel.Account{}); err != nil {
+		note := util.SanitizeHTML(*form.Note) // html OK in note but sanitize it
+		if err := p.db.UpdateOneByID(account.ID, "note", note, &gtsmodel.Account{}); err != nil {
 			return nil, err
 		}
 	}

internal/processing/admin/createdomainblock.go

@@ -28,6 +28,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/id"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
 )
 
 func (p *processor) DomainBlockCreate(account *gtsmodel.Account, domain string, obfuscate bool, publicComment string, privateComment string, subscriptionID string) (*apimodel.DomainBlock, gtserror.WithCode) {
@@ -51,8 +52,8 @@ func (p *processor) DomainBlockCreate(account *gtsmodel.Account, domain string,
 			ID:                 blockID,
 			Domain:             domain,
 			CreatedByAccountID: account.ID,
-			PrivateComment:     privateComment,
-			PublicComment:      publicComment,
+			PrivateComment:     util.RemoveHTML(privateComment),
+			PublicComment:      util.RemoveHTML(publicComment),
 			Obfuscate:          obfuscate,
 			SubscriptionID:     subscriptionID,
 		}

internal/processing/instance.go

@@ -60,7 +60,7 @@ func (p *processor) InstancePatch(form *apimodel.InstanceSettingsUpdateRequest)
 		if err := util.ValidateSiteTitle(*form.Title); err != nil {
 			return nil, gtserror.NewErrorBadRequest(err, fmt.Sprintf("site title invalid: %s", err))
 		}
-		i.Title = *form.Title
+		i.Title = util.RemoveHTML(*form.Title) // don't allow html in site title
 	}
 
 	// validate & update site contact account if it's set on the form
@@ -110,7 +110,7 @@ func (p *processor) InstancePatch(form *apimodel.InstanceSettingsUpdateRequest)
 		if err := util.ValidateSiteShortDescription(*form.ShortDescription); err != nil {
 			return nil, gtserror.NewErrorBadRequest(err, err.Error())
 		}
-		i.ShortDescription = *form.ShortDescription
+		i.ShortDescription = util.SanitizeHTML(*form.ShortDescription) // html is OK in site description, but we should sanitize it
 	}
 
 	// validate & update site description if it's set on the form
@@ -118,7 +118,7 @@ func (p *processor) InstancePatch(form *apimodel.InstanceSettingsUpdateRequest)
 		if err := util.ValidateSiteDescription(*form.Description); err != nil {
 			return nil, gtserror.NewErrorBadRequest(err, err.Error())
 		}
-		i.Description = *form.Description
+		i.Description = util.SanitizeHTML(*form.Description) // html is OK in site description, but we should sanitize it
 	}
 
 	// validate & update site terms if it's set on the form
@@ -126,7 +126,7 @@ func (p *processor) InstancePatch(form *apimodel.InstanceSettingsUpdateRequest)
 		if err := util.ValidateSiteTerms(*form.Terms); err != nil {
 			return nil, gtserror.NewErrorBadRequest(err, err.Error())
 		}
-		i.Terms = *form.Terms
+		i.Terms = util.SanitizeHTML(*form.Terms) // html is OK in site terms, but we should sanitize it
 	}
 
 	// process avatar if provided

internal/processing/media/create.go

@@ -26,6 +26,7 @@ import (
 
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
 )
 
 func (p *processor) Create(account *gtsmodel.Account, form *apimodel.AttachmentRequest) (*apimodel.Attachment, error) {
@@ -53,7 +54,7 @@ func (p *processor) Create(account *gtsmodel.Account, form *apimodel.AttachmentR
 	// TODO: handle this inside mediaHandler.ProcessAttachment (just pass more params to it)
 
 	// first description
-	attachment.Description = form.Description
+	attachment.Description = util.RemoveHTML(form.Description) // remove any HTML from the image description
 
 	// now parse the focus parameter
 	focusx, focusy, err := parseFocus(form.Focus)

internal/processing/media/update.go

@@ -26,6 +26,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
 )
 
 func (p *processor) Update(account *gtsmodel.Account, mediaAttachmentID string, form *apimodel.AttachmentUpdateRequest) (*apimodel.Attachment, gtserror.WithCode) {
@@ -43,7 +44,7 @@ func (p *processor) Update(account *gtsmodel.Account, mediaAttachmentID string,
 	}
 
 	if form.Description != nil {
-		attachment.Description = *form.Description
+		attachment.Description = util.RemoveHTML(*form.Description)
 		if err := p.db.UpdateByID(mediaAttachmentID, attachment); err != nil {
 			return nil, gtserror.NewErrorInternalError(fmt.Errorf("database error updating description: %s", err))
 		}

internal/processing/status/create.go

@@ -29,7 +29,7 @@ func (p *processor) Create(account *gtsmodel.Account, application *gtsmodel.Appl
 		Local:                    true,
 		AccountID:                account.ID,
 		AccountURI:               account.URI,
-		ContentWarning:           form.SpoilerText,
+		ContentWarning:           util.RemoveHTML(form.SpoilerText),
 		ActivityStreamsType:      gtsmodel.ActivityStreamsNote,
 		Sensitive:                form.Sensitive,
 		Language:                 form.Language,

internal/processing/status/util.go

@@ -264,6 +264,10 @@ func (p *processor) processContent(form *apimodel.AdvancedStatusCreateForm, acco
 	// replace newlines with breaks
 	content = strings.ReplaceAll(content, "\n", "<br />")
 
-	status.Content = content
+	// sanitize html to remove any dodgy scripts or other disallowed elements
+	clean := util.SanitizeHTML(content)
+
+	// set the content as the shiny clean parsed content
+	status.Content = clean
 	return nil
 }