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Parse nested multipart emails, fixes #610

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This commit is contained in:
binwiederhier 2023-02-19 10:13:25 -05:00
parent e9b05e8ed7
commit 5f75e98861
3 changed files with 90 additions and 26 deletions
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2
docs/releases.md
View File

@ -6,7 +6,7 @@ and the [ntfy Android app](https://github.com/binwiederhier/ntfy-android/release
**Bug fixes + maintenance:**
* Support for base64 encoded emails ([#610](https://github.com/binwiederhier/ntfy/issues/610), thanks to [@Robert-litts](https://github.com/Robert-litts))
* Support for base64-encoded and nested multipart emails ([#610](https://github.com/binwiederhier/ntfy/issues/610), thanks to [@Robert-litts](https://github.com/Robert-litts))
**Additional languages:**

37
server/smtp_server.go
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@ -22,9 +22,14 @@ var (
errInvalidAddress = errors.New("invalid address")
errInvalidTopic = errors.New("invalid topic")
errTooManyRecipients = errors.New("too many recipients")
errMultipartNestedTooDeep = errors.New("multipart message nested too deep")
errUnsupportedContentType = errors.New("unsupported content type")
)
const (
maxMultipartDepth = 2
)
// smtpBackend implements SMTP server methods.
type smtpBackend struct {
config *Config
@ -121,7 +126,7 @@ func (s *smtpSession) Data(r io.Reader) error {
if err != nil {
return err
}
body, err := readMailBody(msg)
body, err := readMailBody(msg.Body, msg.Header)
if err != nil {
return err
}
@ -203,36 +208,42 @@ func (s *smtpSession) withFailCount(fn func() error) error {
return err
}
func readMailBody(msg *mail.Message) (string, error) {
if msg.Header.Get("Content-Type") == "" {
return readPlainTextMailBody(msg.Body, msg.Header.Get("Content-Transfer-Encoding"))
func readMailBody(body io.Reader, header mail.Header) (string, error) {
if header.Get("Content-Type") == "" {
return readPlainTextMailBody(body, header.Get("Content-Transfer-Encoding"))
}
contentType, params, err := mime.ParseMediaType(msg.Header.Get("Content-Type"))
contentType, params, err := mime.ParseMediaType(header.Get("Content-Type"))
if err != nil {
return "", err
}
if strings.ToLower(contentType) == "text/plain" {
return readPlainTextMailBody(msg.Body, msg.Header.Get("Content-Transfer-Encoding"))
return readPlainTextMailBody(body, header.Get("Content-Transfer-Encoding"))
} else if strings.HasPrefix(strings.ToLower(contentType), "multipart/") {
return readMultipartMailBody(msg, params)
return readMultipartMailBody(body, params, 0)
}
return "", errUnsupportedContentType
}
func readMultipartMailBody(msg *mail.Message, params map[string]string) (string, error) {
mr := multipart.NewReader(msg.Body, params["boundary"])
func readMultipartMailBody(body io.Reader, params map[string]string, depth int) (string, error) {
if depth >= maxMultipartDepth {
return "", errMultipartNestedTooDeep
}
mr := multipart.NewReader(body, params["boundary"])
for {
part, err := mr.NextPart()
if err != nil { // may be io.EOF
return "", err
}
partContentType, _, err := mime.ParseMediaType(part.Header.Get("Content-Type"))
partContentType, partParams, err := mime.ParseMediaType(part.Header.Get("Content-Type"))
if err != nil {
return "", err
} else if strings.ToLower(partContentType) != "text/plain" {
continue
}
return readPlainTextMailBody(part, part.Header.Get("Content-Transfer-Encoding"))
if strings.ToLower(partContentType) == "text/plain" {
return readPlainTextMailBody(part, part.Header.Get("Content-Transfer-Encoding"))
} else if strings.HasPrefix(strings.ToLower(partContentType), "multipart/") {
return readMultipartMailBody(part, partParams, depth+1)
}
// Continue with next part
}
}

77
server/smtp_server_test.go
View File

@ -390,10 +390,8 @@ L0VOIj4KClRoaXMgaXMgYSB0ZXN0IG1lc3NhZ2UgZnJvbSBUcnVlTkFTIENPUkUuCg==
writeAndReadUntilLine(t, email, c, scanner, "250 2.0.0 OK: queued")
}
/*
func TestSmtpBackend_NestedMultipartBase64(t *testing.T) {
email := `EHLO example.com
func TestSmtpBackend_NestedMultipartBase64(t *testing.T) {
email := `EHLO example.com
MAIL FROM: test@mydomain.me
RCPT TO: ntfy-mytopic@ntfy.sh
DATA
@ -431,14 +429,69 @@ L0VOIj4KClRoaXMgaXMgYSB0ZXN0IG1lc3NhZ2UgZnJvbSBUcnVlTkFTIENPUkUuCg==
.
`
s, c, _, scanner := newTestSMTPServer(t, func(w http.ResponseWriter, r *http.Request) {
t.Fatal("This should not be called")
})
defer s.Close()
defer c.Close()
writeAndReadUntilLine(t, email, c, scanner, "451 4.0.0 invalid address")
}
*/
s, c, _, scanner := newTestSMTPServer(t, func(w http.ResponseWriter, r *http.Request) {
require.Equal(t, "/mytopic", r.URL.Path)
require.Equal(t, "TrueNAS truenas.local: TrueNAS Test Message hostname: truenas.local", r.Header.Get("Title"))
require.Equal(t, "This is a test message from TrueNAS CORE.", readAll(t, r.Body))
})
defer s.Close()
defer c.Close()
writeAndReadUntilLine(t, email, c, scanner, "250 2.0.0 OK: queued")
}
func TestSmtpBackend_NestedMultipartTooDeep(t *testing.T) {
email := `EHLO example.com
MAIL FROM: test@mydomain.me
RCPT TO: ntfy-mytopic@ntfy.sh
DATA
Content-Type: multipart/mixed; boundary="===============1=="
MIME-Version: 1.0
Subject: TrueNAS truenas.local: TrueNAS Test Message hostname: truenas.local
From: =?utf-8?q?Robbie?= <test@mydomain.me>
To: test@mydomain.me
Date: Thu, 16 Feb 2023 01:04:00 -0000
Message-ID: <truenas-20230216.010400.344514.b'8jfL'@truenas.local>
This is a multi-part message in MIME format.
--===============1==
Content-Type: multipart/alternative; boundary="===============2=="
MIME-Version: 1.0
--===============2==
Content-Type: multipart/alternative; boundary="===============3=="
MIME-Version: 1.0
--===============3==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
VGhpcyBpcyBhIHRlc3QgbWVzc2FnZSBmcm9tIFRydWVOQVMgQ09SRS4=
--===============3==
Content-Type: text/html; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9uYWwv
L0VOIj4KClRoaXMgaXMgYSB0ZXN0IG1lc3NhZ2UgZnJvbSBUcnVlTkFTIENPUkUuCg==
--===============3==--
--===============2==--
--===============1==--
.
`
s, c, _, scanner := newTestSMTPServer(t, func(w http.ResponseWriter, r *http.Request) {
t.Fatal("This should not be called")
})
defer s.Close()
defer c.Close()
writeAndReadUntilLine(t, email, c, scanner, "554 5.0.0 Error: transaction failed, blame it on the weather: multipart message nested too deep")
}
type smtpHandlerFunc func(http.ResponseWriter, *http.Request)
func newTestSMTPServer(t *testing.T, handler smtpHandlerFunc) (s *smtp.Server, c net.Conn, conf *Config, scanner *bufio.Scanner) {