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TLS debugging

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M66B
2022-01-08 13:35:45 +01:00
parent 5603fe88ca
commit f0cf46db94
3 changed files with 132 additions and 117 deletions
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226
app/src/main/java/eu/faircode/email/MessageHelper.java
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@@ -2055,121 +2055,127 @@ public class MessageHelper {
for (String r : received) {
String header = MimeUtility.unfold(r);
Log.i("--- header=" + header);
// Strip date
int semi = header.lastIndexOf(';');
if (semi > 0)
header = header.substring(0, semi);
if (header.contains("using TLS") ||
header.contains("version=TLS")) {
Log.i("--- found TLS");
continue;
}
// (qmail nnn invoked by uid nnn); 1 Jan 2022 00:00:00 -0000
if (header.contains("qmail") && header.contains("invoked by uid")) {
Log.i("--- found qmail");
continue;
}
// Get key/values
String[] parts = header.split("\\s+");
Map<String, StringBuilder> kv = new HashMap<>();
String key = null;
for (int p = 0; p < parts.length; p++) {
String k = parts[p].toLowerCase(Locale.ROOT);
if (RECEIVED_WORDS.contains(k)) {
key = k;
if (!kv.containsKey(key))
kv.put(key, new StringBuilder());
} else if (key != null) {
StringBuilder sb = kv.get(key);
if (sb.length() > 0)
sb.append(' ');
sb.append(parts[p]);
}
}
// Dump
for (String k : kv.keySet())
Log.i("--- " + k + "=" + kv.get(k));
// Check if 'by' local address
if (kv.containsKey("by")) {
String by = kv.get("by").toString();
if (isLocal(by)) {
Log.i("--- local by=" + by);
continue;
}
}
// Check if 'from' local address
if (kv.containsKey("from")) {
String from = kv.get("from").toString();
if (isLocal(from)) {
Log.i("--- local from=" + from);
continue;
}
}
// Check Microsoft front end transport (proxy)
// https://social.technet.microsoft.com/wiki/contents/articles/50370.exchange-2016-what-is-the-front-end-transport-service-on-the-mailbox-role.aspx
if (kv.containsKey("via")) {
String via = kv.get("via").toString();
if ("Frontend Transport".equals(via)) {
Log.i("--- frontend via=" + via);
continue;
}
}
// Check protocol
if (!kv.containsKey("with")) {
Log.i("--- with missing");
return null;
}
// https://datatracker.ietf.org/doc/html/rfc3848
// https://www.iana.org/assignments/mail-parameters/mail-parameters.txt
String with = kv.get("with").toString();
int w = with.indexOf(' ');
String protocol = (w < 0 ? with : with.substring(0, w)).toLowerCase(Locale.ROOT);
if ("local".equals(protocol)) {
// Exim
Log.i("--- local with=" + with);
continue;
}
if ("mapi".equals(protocol)) {
// https://en.wikipedia.org/wiki/MAPI
Log.i("--- mapi with=" + with);
continue;
}
if ("http".equals(protocol) ||
"httprest".equals(protocol)) {
// httprest by gmailapi.google.com
Log.i("--- http with=" + with);
continue;
}
if (!protocol.contains("mtp")) {
Log.i("--- unknown with=" + with);
return null;
}
if (!protocol.contains("mtps" /* STARTTLS */) &&
!protocol.contains("_mtpa" /* AUTH */)) {
Log.i("--- insecure with=" + with);
return false;
}
Boolean tls = isTLS(header);
if (!Boolean.TRUE.equals(tls))
return tls;
}
return true;
}
private boolean isLocal(String value) {
static Boolean isTLS(String header) {
// Strip date
int semi = header.lastIndexOf(';');
if (semi > 0)
header = header.substring(0, semi);
if (header.contains("using TLS") ||
header.contains("version=TLS")) {
Log.i("--- found TLS");
return true;
}
// (qmail nnn invoked by uid nnn); 1 Jan 2022 00:00:00 -0000
if (header.contains("qmail") && header.contains("invoked by uid")) {
Log.i("--- found qmail");
return true;
}
// Get key/values
String[] parts = header.split("\\s+");
Map<String, StringBuilder> kv = new HashMap<>();
String key = null;
for (int p = 0; p < parts.length; p++) {
String k = parts[p].toLowerCase(Locale.ROOT);
if (RECEIVED_WORDS.contains(k)) {
key = k;
if (!kv.containsKey(key))
kv.put(key, new StringBuilder());
} else if (key != null) {
StringBuilder sb = kv.get(key);
if (sb.length() > 0)
sb.append(' ');
sb.append(parts[p]);
}
}
// Dump
for (String k : kv.keySet())
Log.i("--- " + k + "=" + kv.get(k));
// Check if 'by' local address
if (kv.containsKey("by")) {
String by = kv.get("by").toString();
if (isLocal(by)) {
Log.i("--- local by=" + by);
return true;
}
}
// Check if 'from' local address
if (kv.containsKey("from")) {
String from = kv.get("from").toString();
if (isLocal(from)) {
Log.i("--- local from=" + from);
return true;
}
}
// Check Microsoft front end transport (proxy)
// https://social.technet.microsoft.com/wiki/contents/articles/50370.exchange-2016-what-is-the-front-end-transport-service-on-the-mailbox-role.aspx
if (kv.containsKey("via")) {
String via = kv.get("via").toString();
if ("Frontend Transport".equals(via)) {
Log.i("--- frontend via=" + via);
return true;
}
}
// Check protocol
if (!kv.containsKey("with")) {
Log.i("--- with missing");
return null;
}
// https://datatracker.ietf.org/doc/html/rfc3848
// https://www.iana.org/assignments/mail-parameters/mail-parameters.txt
String with = kv.get("with").toString();
int w = with.indexOf(' ');
String protocol = (w < 0 ? with : with.substring(0, w)).toLowerCase(Locale.ROOT);
if ("local".equals(protocol)) {
// Exim
Log.i("--- local with=" + with);
return true;
}
if ("mapi".equals(protocol)) {
// https://en.wikipedia.org/wiki/MAPI
Log.i("--- mapi with=" + with);
return true;
}
if ("http".equals(protocol) ||
"httprest".equals(protocol)) {
// httprest by gmailapi.google.com
Log.i("--- http with=" + with);
return true;
}
if (!protocol.contains("mtp")) {
Log.i("--- unknown with=" + with);
return null;
}
if (protocol.contains("mtps")) {
Log.i("--- insecure with=" + with);
return true;
}
return false;
}
private static boolean isLocal(String value) {
if (value.contains("localhost") ||
value.contains("[127.0.0.1]") ||
value.contains("[::1]"))