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package panda.net.mail.dkim;
import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.InvalidKeySpecException;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import panda.codec.binary.Base64;
import panda.lang.Arrays;
import panda.lang.Collections;
import panda.lang.Exceptions;
import panda.lang.Strings;
import panda.net.Mimes;
import panda.net.smtp.SMTPHeader;
import panda.util.crypto.Algorithms;
import panda.util.crypto.Keys;
/**
* Main class providing a signature according to DKIM RFC 4871.
*/
public class DkimSigner {
private static final String[] MIMIMUM_HEADERS_TO_SIGN = new String[] {
SMTPHeader.FROM,
SMTPHeader.TO,
SMTPHeader.SUBJECT
};
private static final String[] DEFAULT_HEADERS_TO_SIGN = new String[] {
SMTPHeader.FROM,
SMTPHeader.TO,
SMTPHeader.SUBJECT,
SMTPHeader.CONTENT_DISPOSITION,
SMTPHeader.CONTENT_ID,
SMTPHeader.CONTENT_TYPE,
SMTPHeader.CONTENT_TRANSFER_ENCODING,
SMTPHeader.CC,
SMTPHeader.DATE,
SMTPHeader.REPLY_TO,
SMTPHeader.IN_REPLY_TO,
SMTPHeader.SENDER,
SMTPHeader.LIST_SUBSCRIBE,
SMTPHeader.LIST_POST,
SMTPHeader.LIST_OWNER,
SMTPHeader.LIST_ID,
SMTPHeader.LIST_ARCHIVE,
SMTPHeader.LIST_HELP,
SMTPHeader.LIST_UNSUBSCRIBE,
SMTPHeader.MIME_VERSION,
SMTPHeader.MESSAGE_ID,
SMTPHeader.RESENT_FROM,
SMTPHeader.RESENT_TO,
SMTPHeader.RESENT_CC,
SMTPHeader.RESENT_DATE,
SMTPHeader.RESENT_MESSAGE_ID,
SMTPHeader.RESENT_SENDER,
};
private static final Set minHeadersToSign = Collections.caseInsensitiveSet(Arrays.asList(MIMIMUM_HEADERS_TO_SIGN));
private final Set headersToSign = Collections.caseInsensitiveSet(Arrays.asList(DEFAULT_HEADERS_TO_SIGN));
private SigningAlgorithm signingAlgorithm = SigningAlgorithm.SHA256_WITH_RSA;
private Signature signature;
private MessageDigest messageDigest;
private String domain;
private String selector;
private String identity;
private int bodyLength;
private boolean zParam;
private Canonicalization headerCanonicalization = Canonicalization.RELAXED;
private Canonicalization bodyCanonicalization = Canonicalization.SIMPLE;
private PrivateKey privateKey;
/**
* Created a new {@code DkimSigner} for the given signing domain and
* selector with the given {@link PrivateKey}.
*
* @param domain
* The signing domain to be used.
* @param selector
* The selector to be used.
* @param privateKey
* The {@link PrivateKey} to be used to sign.
* @throws DkimException
* If the given signing domain is invalid.
*/
public DkimSigner(String domain, String selector, PrivateKey privateKey) throws DkimException {
initDkimSigner(domain, selector, privateKey);
}
/**
* Created a new {@code DkimSigner} for the given signing domain and
* selector with the given DER encoded RSA private Key.
*
* @param domain
* The signing domain to be used.
* @param selector
* The selector to be used.
* @param key
* A byte array that yields the DER encoded RSA private
* key to be used.
*
* @throws NoSuchAlgorithmException
* If the RSA algorithm is not supported by the current JVM.
* @throws InvalidKeySpecException
* If the content of the given {@link InputStream} couldn't be
* interpreted as an RSA private key.
* @throws DkimException
* If the given signing domain is invalid.
*/
public DkimSigner(String domain, String selector, byte[] key) throws
NoSuchAlgorithmException, InvalidKeySpecException {
PrivateKey privKey = Keys.getPrivateKey(key, Algorithms.RSA);
initDkimSigner(domain, selector, privKey);
}
/**
* Created a new {@code DkimSigner} for the given signing domain and
* selector with the given DER encoded RSA private Key.
*
* @param domain
* The signing domain to be used.
* @param selector
* The selector to be used.
* @param key
* A string that yields the PEM format DER encoded RSA private
* key to be used.
*
* @throws NoSuchAlgorithmException
* If the RSA algorithm is not supported by the current JVM.
* @throws InvalidKeySpecException
* If the content of the given {@link InputStream} couldn't be
* interpreted as an RSA private key.
* @throws DkimException
* If the given signing domain is invalid.
*/
public DkimSigner(String domain, String selector, String key) throws
NoSuchAlgorithmException, InvalidKeySpecException {
PrivateKey privKey = Keys.getPrivateKey(key, Algorithms.RSA);
initDkimSigner(domain, selector, privKey);
}
private void initDkimSigner(String domain, String selector, PrivateKey privkey) throws DkimException {
this.domain = domain;
this.selector = selector.trim();
this.privateKey = privkey;
this.setSigningAlgorithm(this.signingAlgorithm);
}
/**
* Returns the configured identity parameter.
*
* @return The configured identity parameter.
*/
public String getIdentity() {
return identity;
}
/**
* Sets the identity parameter to be used.
*
* @param identity
* The identity to be used.
* @throws DkimException
* If the given identity parameter doesn't belong to the signing
* domain of this {@code DkimSigner} or an subdomain thereof.
*/
public void setIdentity(String identity) throws DkimException {
if (null != identity) {
identity = identity.trim();
if (!(identity.endsWith("@" + domain) || identity.endsWith("." + domain))) {
throw new DkimException("The domain part of " + identity + " has to be " + domain
+ " or a subdomain thereof");
}
}
this.identity = identity;
}
/**
* Returns the configured {@link Canonicalization} to be used for the body.
*
* @return The configured {@link Canonicalization} to be used for the body.
*/
public Canonicalization getBodyCanonicalization() {
return bodyCanonicalization;
}
/**
* Sets the {@link Canonicalization} to be used for the body.
*
* @param canonicalization
* The {@link Canonicalization} to be used for the body.
*/
public void setBodyCanonicalization(Canonicalization canonicalization) {
this.bodyCanonicalization = canonicalization;
}
/**
* Returns the configured {@link Canonicalization} to be used for the
* headers.
*
* @return The configured {@link Canonicalization} to be used for the
* headers.
*/
public Canonicalization getHeaderCanonicalization() {
return headerCanonicalization;
}
/**
* Sets the {@link Canonicalization} to be used for the headers.
*
* @param canonicalization
* The {@link Canonicalization} to be used for the headers.
*/
public void setHeaderCanonicalization(Canonicalization canonicalization) {
this.headerCanonicalization = canonicalization;
}
/**
* Adds a header to the set of headers that will be included in the
* signature, if present.
*
* @param header
* The name of the header.
*/
public void addHeaderToSign(String header) {
if (null != header && 0 != header.length()) {
headersToSign.add(header);
}
}
/**
* Removes a header from the set of headers that will be included in the
* signature, unless it is one of the required headers ('From', 'To',
* 'Subject').
*
* @param header
* The name of the header.
*/
public void removeHeaderToSign(String header) {
if (Strings.isNotEmpty(header) && !minHeadersToSign.contains(header)) {
headersToSign.remove(header);
}
}
/**
* Returns the configured length parameter.
*
* @return The configured length parameter.
*/
public int getBodyLength() {
return bodyLength;
}
/**
* Sets the length parameter to be used.
*
* @param bodyLength
* The length parameter to be used.
*/
public void setBodyLength(int bodyLength) {
this.bodyLength = bodyLength;
}
/**
* Returns the configured z parameter.
*
* @return The configured z parameter.
*/
public boolean isZParam() {
return zParam;
}
/**
* Sets the z parameter to be used.
*
* @param zParam
* The z parameter to be used.
*/
public void setZParam(boolean zParam) {
this.zParam = zParam;
}
/**
* Returns the configured {@link SigningAlgorithm}.
*
* @return The configured {@link SigningAlgorithm}.
*/
public SigningAlgorithm getSigningAlgorithm() {
return signingAlgorithm;
}
/**
* Sets the {@link SigningAlgorithm} to be used.
*
* @param signingAlgorithm
* The {@link SigningAlgorithm} to be used.
*
* @throws DkimException
* If either the signing algorithm or the hashing algorithm is
* not supported by the current JVM or the {@link Signature}
* couldn't be initialized.
*/
public void setSigningAlgorithm(SigningAlgorithm signingAlgorithm) throws DkimException {
try {
messageDigest = MessageDigest.getInstance(signingAlgorithm.getHashNotation());
}
catch (NoSuchAlgorithmException e) {
throw new DkimException("The hashing algorithm " + signingAlgorithm.getHashNotation()
+ " is not known by the JVM", e);
}
try {
signature = Signature.getInstance(signingAlgorithm.getJavaNotation());
}
catch (NoSuchAlgorithmException e) {
throw new DkimException("The signing algorithm " + signingAlgorithm.getJavaNotation()
+ " is not known by the JVM", e);
}
try {
signature.initSign(privateKey);
}
catch (InvalidKeyException e) {
throw new DkimException("The provided private key is invalid", e);
}
this.signingAlgorithm = signingAlgorithm;
}
public String sign(SMTPHeader header, String body) throws DkimException {
Map dkimSignature = new LinkedHashMap();
dkimSignature.put("v", "1");
dkimSignature.put("a", this.signingAlgorithm.getRfc4871Notation());
dkimSignature.put("q", "dns/txt");
dkimSignature.put("c", getHeaderCanonicalization().getType() + "/" + getBodyCanonicalization().getType());
dkimSignature.put("t", ((long) new Date().getTime() / 1000) + "");
dkimSignature.put("s", this.selector);
dkimSignature.put("d", this.domain);
// set identity inside signature
if (identity != null) {
dkimSignature.put("i", quotedPrintable(identity));
}
// process header
Set assureHeaders = Collections.caseInsensitiveSet(Arrays.asList(MIMIMUM_HEADERS_TO_SIGN));
// intersect defaultHeadersToSign with available headers
StringBuilder headerList = new StringBuilder();
StringBuilder headerContent = new StringBuilder();
StringBuilder zParamString = new StringBuilder();
for (Map.Entry en : header.entrySet()) {
String key = en.getKey();
if (headersToSign.contains(key)) {
String headerValue = header.getValue(key);
headerList.append(key).append(":");
headerContent.append(headerCanonicalization.canonicalizeHeader(key, headerValue));
headerContent.append("\r\n");
assureHeaders.remove(key);
if (zParam) {
zParamString.append(key);
zParamString.append(":");
zParamString.append(quotedPrintable(headerValue.trim()).replace("|", "=7C"));
zParamString.append("|");
}
}
}
if (!assureHeaders.isEmpty()) {
throw new DkimException("Could not find the header fields " + concatList(assureHeaders, ", ")
+ " for signing");
}
dkimSignature.put("h", headerList.substring(0, headerList.length() - 1));
if (zParam) {
String zParamTemp = zParamString.toString();
dkimSignature.put("z", zParamTemp.substring(0, zParamTemp.length() - 1));
}
// process body
if (bodyLength > 0 && bodyLength <= body.length()) {
dkimSignature.put("l", Integer.toString(bodyLength));
body = bodyCanonicalization.canonicalizeBody(body.substring(0, bodyLength));
}
else {
body = bodyCanonicalization.canonicalizeBody(body);
}
// calculate and encode body hash
dkimSignature.put("bh", Base64.encodeBase64String(messageDigest.digest(body.getBytes())));
// create signature
String serializedSignature = serializeDkimSignature(dkimSignature);
byte[] signedSignature;
try {
headerContent.append(headerCanonicalization.canonicalizeHeader(SMTPHeader.DKIM_SIGNATUR, serializedSignature));
signature.update(headerContent.toString().getBytes());
signedSignature = signature.sign();
}
catch (SignatureException se) {
throw new DkimException("The signing operation by Java security failed", se);
}
return SMTPHeader.DKIM_SIGNATUR + ": " + serializedSignature + Base64.encodeBase64String(signedSignature);
}
private String serializeDkimSignature(Map dkimSignature) {
StringBuilder sb = new StringBuilder();
for (Entry en : dkimSignature.entrySet()) {
sb.append(en.getKey())
.append('=')
.append(en.getValue())
.append("; ");
}
sb.append("b=");
return sb.toString();
}
private static String concatList(Set assureHeaders, String separator) {
StringBuilder buffer = new StringBuilder();
for (String string : assureHeaders) {
buffer.append(string);
buffer.append(separator);
}
return buffer.substring(0, buffer.length() - separator.length());
}
private static String quotedPrintable(String s) {
try {
String encoded = Mimes.encodeWord(s);
encoded = encoded.replaceAll(";", "=3B");
encoded = encoded.replaceAll(" ", "=20");
return encoded;
}
catch (IOException e) {
throw Exceptions.wrapThrow(e);
}
}
}
