forgejo/modules/upload/upload.go
silverwind cda44750cb
Attachments: Add extension support, allow all types for releases (#12465)
* Attachments: Add extension support, allow all types for releases

- Add support for file extensions, matching the `accept` attribute of `<input type="file">`
- Add support for type wildcard mime types, e.g. `image/*`
- Create repository.release.ALLOWED_TYPES setting (default unrestricted)
- Change default for attachment.ALLOWED_TYPES to a list of extensions
- Split out POST /attachments into two endpoints for issue/pr and
  releases to prevent circumvention of allowed types check

Fixes: https://github.com/go-gitea/gitea/pull/10172
Fixes: https://github.com/go-gitea/gitea/issues/7266
Fixes: https://github.com/go-gitea/gitea/pull/12460
Ref: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#Unique_file_type_specifiers

* rename function

* extract GET routes out of RepoMustNotBeArchived

Co-authored-by: Lauris BH <lauris@nix.lv>
2020-10-05 01:49:33 -04:00

95 lines
3.5 KiB
Go

// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package upload
import (
"net/http"
"path"
"regexp"
"strings"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)
// ErrFileTypeForbidden not allowed file type error
type ErrFileTypeForbidden struct {
Type string
}
// IsErrFileTypeForbidden checks if an error is a ErrFileTypeForbidden.
func IsErrFileTypeForbidden(err error) bool {
_, ok := err.(ErrFileTypeForbidden)
return ok
}
func (err ErrFileTypeForbidden) Error() string {
return "This file extension or type is not allowed to be uploaded."
}
var mimeTypeSuffixRe = regexp.MustCompile(`;.*$`)
var wildcardTypeRe = regexp.MustCompile(`^[a-z]+/\*$`)
// Verify validates whether a file is allowed to be uploaded.
func Verify(buf []byte, fileName string, allowedTypesStr string) error {
allowedTypesStr = strings.ReplaceAll(allowedTypesStr, "|", ",") // compat for old config format
allowedTypes := []string{}
for _, entry := range strings.Split(allowedTypesStr, ",") {
entry = strings.ToLower(strings.TrimSpace(entry))
if entry != "" {
allowedTypes = append(allowedTypes, entry)
}
}
if len(allowedTypes) == 0 {
return nil // everything is allowed
}
fullMimeType := http.DetectContentType(buf)
mimeType := strings.TrimSpace(mimeTypeSuffixRe.ReplaceAllString(fullMimeType, ""))
extension := strings.ToLower(path.Ext(fileName))
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#Unique_file_type_specifiers
for _, allowEntry := range allowedTypes {
if allowEntry == "*/*" {
return nil // everything allowed
} else if strings.HasPrefix(allowEntry, ".") && allowEntry == extension {
return nil // extension is allowed
} else if mimeType == allowEntry {
return nil // mime type is allowed
} else if wildcardTypeRe.MatchString(allowEntry) && strings.HasPrefix(mimeType, allowEntry[:len(allowEntry)-1]) {
return nil // wildcard match, e.g. image/*
}
}
log.Info("Attachment with type %s blocked from upload", fullMimeType)
return ErrFileTypeForbidden{Type: fullMimeType}
}
// AddUploadContext renders template values for dropzone
func AddUploadContext(ctx *context.Context, uploadType string) {
if uploadType == "release" {
ctx.Data["UploadUrl"] = ctx.Repo.RepoLink + "/releases/attachments"
ctx.Data["UploadRemoveUrl"] = ctx.Repo.RepoLink + "/releases/attachments/remove"
ctx.Data["UploadAccepts"] = strings.Replace(setting.Repository.Release.AllowedTypes, "|", ",", -1)
ctx.Data["UploadMaxFiles"] = setting.Attachment.MaxFiles
ctx.Data["UploadMaxSize"] = setting.Attachment.MaxSize
} else if uploadType == "comment" {
ctx.Data["UploadUrl"] = ctx.Repo.RepoLink + "/issues/attachments"
ctx.Data["UploadRemoveUrl"] = ctx.Repo.RepoLink + "/issues/attachments/remove"
ctx.Data["UploadAccepts"] = strings.Replace(setting.Attachment.AllowedTypes, "|", ",", -1)
ctx.Data["UploadMaxFiles"] = setting.Attachment.MaxFiles
ctx.Data["UploadMaxSize"] = setting.Attachment.MaxSize
} else if uploadType == "repo" {
ctx.Data["UploadUrl"] = ctx.Repo.RepoLink + "/upload-file"
ctx.Data["UploadRemoveUrl"] = ctx.Repo.RepoLink + "/upload-remove"
ctx.Data["UploadAccepts"] = strings.Replace(setting.Repository.Upload.AllowedTypes, "|", ",", -1)
ctx.Data["UploadMaxFiles"] = setting.Repository.Upload.MaxFiles
ctx.Data["UploadMaxSize"] = setting.Repository.Upload.FileMaxSize
}
}