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Native DKIM improvements

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M66B
2023-02-13 20:00:26 +01:00
parent 9dbd02bdc6
commit bf91c80b7e
1 changed files with 51 additions and 42 deletions
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93
app/src/main/java/eu/faircode/email/MessageHelper.java
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@@ -102,6 +102,7 @@ import java.util.Collections;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Locale;
import java.util.Map;
@@ -1992,6 +1993,7 @@ public class MessageHelper {
if (!(imessage instanceof IMAPMessage))
return null;
// Workaround reformatted headers
Properties props = MessageHelper.getSessionProperties(true);
Session isession = Session.getInstance(props, null);
MimeMessage amessage = new MimeMessage(isession, ((IMAPMessage) imessage).getMimeStream());
@@ -2031,58 +2033,66 @@ public class MessageHelper {
String[] c = kv.get("c").split("/");
StringBuilder head = new StringBuilder();
// TODO: check presence from
Log.i("DKIM headers=" + kv.get("h"));
String hs = kv.get("h");
Log.i("DKIM headers=" + hs);
boolean from = false;
List<String> _h = new ArrayList<>();
_h.addAll(Arrays.asList(kv.get("h").split(":")));
for (String key : hs.split(":")) {
_h.add(key.trim());
from = (from || "from".equalsIgnoreCase(key.trim()));
}
if (!from)
throw new IllegalArgumentException("from missing: " + hs);
_h.add("DKIM-Signature");
List<String> processed = new ArrayList<>();
Map<String, Integer> index = new Hashtable<>();
for (String n : _h) {
n = n.trim();
if (processed.contains(n)) {
Log.i("DKIM duplicate header='" + n + "'");
continue;
}
processed.add(n);
// https://datatracker.ietf.org/doc/html/rfc6376/#section-5.4.2
String _n = n.toLowerCase(Locale.ROOT);
Integer idx = index.get(_n);
idx = (idx == null ? 1 : idx + 1);
index.put(_n, idx);
String[] h = ("DKIM-Signature".equals(n) ? new String[]{header} : amessage.getHeader(n));
if (h == null) {
Log.i("DKIM missing header='" + n + "'");
if (h == null || idx > h.length) {
// https://datatracker.ietf.org/doc/html/rfc6376/#section-5.4
Log.i("DKIM missing header=" + n + "[" + idx + "/" + (h == null ? null : h.length) + "]");
continue;
}
for (int i = h.length - 1; i >= 0; i--) {
String v = h[i];
if ("DKIM-Signature".equals(n)) {
int b = v.lastIndexOf("b=");
int s = v.indexOf(";", b + 2);
v = v.substring(0, b + 2) + (s < 0 ? "" : v.substring(s));
} else
Log.i("DKIM " + n + "=" + v.replaceAll("\\r?\\n", "|"));
String v = h[h.length - idx];
if ("DKIM-Signature".equals(n)) {
int b = v.lastIndexOf("b=");
int s = v.indexOf(";", b + 2);
v = v.substring(0, b + 2) + (s < 0 ? "" : v.substring(s));
} else
Log.i("DKIM " + n + "=" + v.replaceAll("\\r?\\n", "|"));
if ("simple".equals(c[0])) {
if ("DKIM-Signature".equals(n))
head.append(n).append(": ").append(v);
else {
// Find original header/name
Enumeration<Header> oheaders = amessage.getAllHeaders();
while (oheaders.hasMoreElements()) {
Header oheader = oheaders.nextElement();
if (n.equalsIgnoreCase(oheader.getName()))
head.append(oheader.getName()).append(": ")
.append(oheader.getValue());
}
if ("simple".equals(c[0])) {
if ("DKIM-Signature".equals(n))
head.append(n).append(": ").append(v);
else {
// Find original header/name
Enumeration<Header> oheaders = amessage.getAllHeaders();
while (oheaders.hasMoreElements()) {
Header oheader = oheaders.nextElement();
if (n.equalsIgnoreCase(oheader.getName()))
head.append(oheader.getName()).append(": ")
.append(oheader.getValue());
}
} else if ("relaxed".equals(c[0])) {
v = MimeUtility.unfold(v);
head.append(n.trim().toLowerCase()).append(':')
.append(v.replaceAll("\\s+", " ").trim());
} else
throw new IllegalArgumentException(c[0]);
}
} else if ("relaxed".equals(c[0])) {
v = MimeUtility.unfold(v);
head.append(_n).append(':')
.append(v.replaceAll("\\s+", " ").trim());
} else
throw new IllegalArgumentException(c[0]);
if (!"DKIM-Signature".equals(n))
head.append("\r\n");
}
if (!"DKIM-Signature".equals(n))
head.append("\r\n");
}
Log.i("DKIM head=" + head.toString().replace("\r\n", "|"));
@@ -2137,7 +2147,6 @@ public class MessageHelper {
boolean verified = sig.verify(signature);
Log.i("DKIM valid=" + verified +
" dns=" + dns +
" results=" + getAuthentication("dkim", getAuthentication()) +
" from=" + formatAddresses(getFrom()));
if (verified)