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package dkim
import (
"bytes"
"crypto"
"math/rand"
"strings"
"testing"
)
const mailHeaderString = "From: Joe SixPack <joe@football.example.com>\r\n" +
"To: Suzie Q <suzie@shopping.example.net>\r\n" +
"Subject: Is dinner ready?\r\n" +
"Date: Fri, 11 Jul 2003 21:00:37 -0700 (PDT)\r\n" +
"Message-ID: <20030712040037.46341.5F8J@football.example.com>\r\n"
const mailBodyString = "Hi.\r\n" +
"\r\n" +
"We lost the game. Are you hungry yet?\r\n" +
"\r\n" +
"Joe."
const mailString = mailHeaderString + "\r\n" + mailBodyString
const signedMailString = "DKIM-Signature: a=rsa-sha256; bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=;" + "\r\n" +
" " + "c=simple/simple; d=example.org; h=From:To:Subject:Date:Message-ID;" + "\r\n" +
" " + "s=brisbane; t=424242; v=1;" + "\r\n" +
" " + "b=MobyyDTeHhMhNJCEI6ATNK63ZQ7deSXK9umyzAvYwFqE6oGGvlQBQwqr1aC11hWpktjMLP1/" + "\r\n" +
" " + "m0PBi9v7cRLKMXXBIv2O0B1mIWdZPqd9jveRJqKzCb7SpqH2u5kK6i2vZI639ENTQzRQdxSAGXc" + "\r\n" +
" " + "PcPYjrgkqj7xklnrNBs0aIUA=" + "\r\n" +
mailHeaderString +
"\r\n" +
mailBodyString
func init() {
randReader = rand.New(rand.NewSource(42))
}
func TestSign(t *testing.T) {
r := strings.NewReader(mailString)
options := &SignOptions{
Domain: "example.org",
Selector: "brisbane",
Signer: testPrivateKey,
}
var b bytes.Buffer
if err := Sign(&b, r, options); err != nil {
t.Fatal("Expected no error while signing mail, got:", err)
}
if s := b.String(); s != signedMailString {
t.Errorf("Expected signed message to be \n%v\n but got \n%v", signedMailString, s)
}
}
func TestSignAndVerify(t *testing.T) {
r := strings.NewReader(mailString)
options := &SignOptions{
Domain: "example.org",
Selector: "brisbane",
Signer: testPrivateKey,
}
var b bytes.Buffer
if err := Sign(&b, r, options); err != nil {
t.Fatal("Expected no error while signing mail, got:", err)
}
verifications, err := Verify(&b)
if err != nil {
t.Fatalf("Expected no error while verifying signature, got: %v", err)
}
if len(verifications) != 1 {
t.Error("Expected exactly one verification")
} else {
v := verifications[0]
if err := v.Err; err != nil {
t.Errorf("Expected no error when verifying signature, got: %v", err)
}
if v.Domain != options.Domain {
t.Errorf("Expected domain to be %q but got %q", options.Domain, v.Domain)
}
}
}
func TestSignAndVerify_relaxed(t *testing.T) {
r := strings.NewReader(mailString)
options := &SignOptions{
Domain: "example.org",
Selector: "brisbane",
Signer: testPrivateKey,
HeaderCanonicalization: "relaxed",
BodyCanonicalization: "relaxed",
}
var b bytes.Buffer
if err := Sign(&b, r, options); err != nil {
t.Fatal("Expected no error while signing mail, got:", err)
}
verifications, err := Verify(&b)
if err != nil {
t.Fatalf("Expected no error while verifying signature, got: %v", err)
}
if len(verifications) != 1 {
t.Error("Expected exactly one verification")
}
}
func TestSign_invalidOptions(t *testing.T) {
r := strings.NewReader(mailString)
var b bytes.Buffer
if err := Sign(&b, r, nil); err == nil {
t.Error("Expected an error when signing a message without options")
}
options := &SignOptions{}
if err := Sign(&b, r, options); err == nil {
t.Error("Expected an error when signing a message without domain")
}
options.Domain = "example.org"
if err := Sign(&b, r, options); err == nil {
t.Error("Expected an error when signing a message without selector")
}
options.Selector = "brisbane"
if err := Sign(&b, r, options); err == nil {
t.Error("Expected an error when signing a message without signer")
}
options.Signer = testPrivateKey
options.HeaderCanonicalization = "pasta"
if err := Sign(&b, r, options); err == nil {
t.Error("Expected an error when signing a message with an invalid header canonicalization")
}
options.HeaderCanonicalization = ""
options.BodyCanonicalization = "potatoe"
if err := Sign(&b, r, options); err == nil {
t.Error("Expected an error when signing a message with an invalid body canonicalization")
}
options.BodyCanonicalization = ""
options.BodyCanonicalization = "potatoe"
if err := Sign(&b, r, options); err == nil {
t.Error("Expected an error when signing a message with an invalid body canonicalization")
}
options.BodyCanonicalization = ""
options.Hash = ^crypto.Hash(0)
if err := Sign(&b, r, options); err == nil {
t.Error("Expected an error when signing a message with an invalid hash algorithm")
}
options.Hash = 0
options.HeaderKeys = []string{"To"}
if err := Sign(&b, r, options); err == nil {
t.Error("Expected an error when signing a message without the From header")
}
options.HeaderKeys = nil
}
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