Only serve attachments when linked to issue/release and if accessible by user (#9340)

* test: add current attachement responses

* refactor: check if attachement is linked and accessible by user

* chore: clean TODO

* fix: typo attachement -> attachment

* revert un-needed go.sum change

* refactor: move models logic to models

* fix TestCreateIssueAttachment which was wrongly successful

* fix unit tests with unittype added

* fix unit tests with changes

* use a valid uuid format for pgsql int. test

* test: add unit test TestLinkedRepository

* refactor: allow uploader to access unlinked attachement

* add missing blank line

* refactor: move to a separate function repo.GetAttachment

* typo

* test: remove err test return

* refactor: use repo perm for access checking generally + 404 for all reject

1 files changed, 137 insertions, 0 deletions

diff --git a/integrations/attachment_test.go b/integrations/attachment_test.go
new file mode 100644
index 0000000000..746256df95
--- /dev/null
+++ b/integrations/attachment_test.go
@@ -0,0 +1,137 @@
+// 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 integrations
+
+import (
+	"bytes"
+	"image"
+	"image/png"
+	"io"
+	"io/ioutil"
+	"mime/multipart"
+	"net/http"
+	"os"
+	"path"
+	"testing"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/test"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func generateImg() bytes.Buffer {
+	// Generate image
+	myImage := image.NewRGBA(image.Rect(0, 0, 32, 32))
+	var buff bytes.Buffer
+	png.Encode(&buff, myImage)
+	return buff
+}
+
+func createAttachment(t *testing.T, session *TestSession, repoURL, filename string, buff bytes.Buffer, expectedStatus int) string {
+	body := &bytes.Buffer{}
+
+	//Setup multi-part
+	writer := multipart.NewWriter(body)
+	part, err := writer.CreateFormFile("file", filename)
+	assert.NoError(t, err)
+	_, err = io.Copy(part, &buff)
+	assert.NoError(t, err)
+	err = writer.Close()
+	assert.NoError(t, err)
+
+	csrf := GetCSRF(t, session, repoURL)
+
+	req := NewRequestWithBody(t, "POST", "/attachments", body)
+	req.Header.Add("X-Csrf-Token", csrf)
+	req.Header.Add("Content-Type", writer.FormDataContentType())
+	resp := session.MakeRequest(t, req, expectedStatus)
+
+	if expectedStatus != http.StatusOK {
+		return ""
+	}
+	var obj map[string]string
+	DecodeJSON(t, resp, &obj)
+	return obj["uuid"]
+}
+
+func TestCreateAnonymousAttachment(t *testing.T) {
+	prepareTestEnv(t)
+	session := emptyTestSession(t)
+	createAttachment(t, session, "user2/repo1", "image.png", generateImg(), http.StatusFound)
+}
+
+func TestCreateIssueAttachment(t *testing.T) {
+	prepareTestEnv(t)
+	const repoURL = "user2/repo1"
+	session := loginUser(t, "user2")
+	uuid := createAttachment(t, session, repoURL, "image.png", generateImg(), http.StatusOK)
+
+	req := NewRequest(t, "GET", repoURL+"/issues/new")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+	htmlDoc := NewHTMLParser(t, resp.Body)
+
+	link, exists := htmlDoc.doc.Find("form").Attr("action")
+	assert.True(t, exists, "The template has changed")
+
+	postData := map[string]string{
+		"_csrf":   htmlDoc.GetCSRF(),
+		"title":   "New Issue With Attachment",
+		"content": "some content",
+		"files":   uuid,
+	}
+
+	req = NewRequestWithValues(t, "POST", link, postData)
+	resp = session.MakeRequest(t, req, http.StatusFound)
+	test.RedirectURL(resp) // check that redirect URL exists
+
+	//Validate that attachment is available
+	req = NewRequest(t, "GET", "/attachments/"+uuid)
+	session.MakeRequest(t, req, http.StatusOK)
+}
+
+func TestGetAttachment(t *testing.T) {
+	prepareTestEnv(t)
+	adminSession := loginUser(t, "user1")
+	user2Session := loginUser(t, "user2")
+	user8Session := loginUser(t, "user8")
+	emptySession := emptyTestSession(t)
+	testCases := []struct {
+		name       string
+		uuid       string
+		createFile bool
+		session    *TestSession
+		want       int
+	}{
+		{"LinkedIssueUUID", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11", true, user2Session, http.StatusOK},
+		{"LinkedCommentUUID", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a17", true, user2Session, http.StatusOK},
+		{"linked_release_uuid", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a19", true, user2Session, http.StatusOK},
+		{"NotExistingUUID", "b0eebc99-9c0b-4ef8-bb6d-6bb9bd380a18", false, user2Session, http.StatusNotFound},
+		{"FileMissing", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a18", false, user2Session, http.StatusInternalServerError},
+		{"NotLinked", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a20", true, user2Session, http.StatusNotFound},
+		{"NotLinkedAccessibleByUploader", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a20", true, user8Session, http.StatusOK},
+		{"PublicByNonLogged", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11", true, emptySession, http.StatusOK},
+		{"PrivateByNonLogged", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a12", true, emptySession, http.StatusNotFound},
+		{"PrivateAccessibleByAdmin", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a12", true, adminSession, http.StatusOK},
+		{"PrivateAccessibleByUser", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a12", true, user2Session, http.StatusOK},
+		{"RepoNotAccessibleByUser", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a12", true, user8Session, http.StatusNotFound},
+		{"OrgNotAccessibleByUser", "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a21", true, user8Session, http.StatusNotFound},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			//Write empty file to be available for response
+			if tc.createFile {
+				localPath := models.AttachmentLocalPath(tc.uuid)
+				err := os.MkdirAll(path.Dir(localPath), os.ModePerm)
+				assert.NoError(t, err)
+				err = ioutil.WriteFile(localPath, []byte("hello world"), 0644)
+				assert.NoError(t, err)
+			}
+			//Actual test
+			req := NewRequest(t, "GET", "/attachments/"+tc.uuid)
+			tc.session.MakeRequest(t, req, tc.want)
+		})
+	}
+}