/// <summary>2b) Receive a DHEWithCertificateAndCAs, verify the certificate and attempt
/// to find a matching Certificate for the list of CAs, if you find one,
/// finish the DHE handshake and send the certificate via a DHEWithCertificate</summary>
/// <param name="sa">A security association that we wish to perform the
/// specified control operation on.</param>
/// <param name="scm">The received SecurityControlMessage.</param>
/// <param name="scm_reply">A prepared reply message (with headers and such.</param>
/// <param name="return_path">Where to send the result.</param>
/// <param name="low_level_sender">We expect the return_path to not be an edge or
/// some other type of "low level" sender, so this contains the parsed out value.</param>
protected void HandleControlDHEWithCertificateAndCAs(PeerSecAssociation sa,
SecurityControlMessage scm, SecurityControlMessage scm_reply,
ISender return_path, ISender low_level_sender)
{
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received DHEWithCertificateAndCAs from: " + low_level_sender);
if (sa == null)
{
sa = CreateSecurityAssociation(low_level_sender, scm.SPI, false);
}
byte[] cert = new byte[scm.Certificate.Length];
scm.Certificate.CopyTo(cert, 0);
X509Certificate rcert = new X509Certificate(cert);
_ch.Verify(rcert, low_level_sender);
HashAlgorithm sha1 = new SHA1CryptoServiceProvider();
scm.Verify((RSACryptoServiceProvider)rcert.RSA, sha1);
X509Certificate lcert = null;
if (SecurityPolicy.GetPolicy(scm.SPI).PreExchangedKeys)
{
lcert = _ch.DefaultCertificate;
}
else
{
lcert = _ch.FindCertificate(scm.CAs);
}
sa.LocalCertificate = lcert;
sa.RemoteCertificate = rcert;
sa.RDHE.Value = scm.DHE;
sa.DHEWithCertificateAndCAsInHash.Value = MemBlock.Reference(sha1.ComputeHash((byte[])scm.Packet));
scm_reply.LocalCookie = scm.RemoteCookie;
scm_reply.RemoteCookie = scm.LocalCookie;
scm_reply.DHE = sa.LDHE;
scm_reply.Certificate = MemBlock.Reference(lcert.RawData);
scm_reply.Type = SecurityControlMessage.MessageType.DHEWithCertificate;
lock (_private_key_lock) {
scm_reply.Sign(_private_key, sha1);
}
sa.DHEWithCertificateHash.Value = MemBlock.Reference(sha1.ComputeHash((byte[])scm_reply.Packet));
ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);
return_path.Send(to_send);
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful DHEWithCertificateAndCAs from: " + low_level_sender);
}
/// <summary>Removes the specified SA from our database.</summary>
override protected void RemoveSA(SecurityAssociation sa)
{
PeerSecAssociation psa = sa as PeerSecAssociation;
if (psa == null)
{
throw new Exception("Invalid PeerSecAssociation: " + sa);
}
lock (_sync) {
if (_spi.ContainsKey(psa.SPI))
{
_spi[psa.SPI].Remove(psa.Sender);
}
}
}
/// <summary>This (idempotently) returns a new SecurityAssociation for the
/// specified sender using the specified SA.</summary>
protected PeerSecAssociation CreateSecurityAssociation(ISender Sender,
int SPI, bool start)
{
if (!SecurityPolicy.Supports(SPI))
{
throw new Exception("Unsupported SPI");
}
PeerSecAssociation sa = null;
lock (_sync) {
Dictionary <ISender, PeerSecAssociation> sender_to_sa = null;
if (_spi.ContainsKey(SPI))
{
sender_to_sa = _spi[SPI];
}
else
{
sender_to_sa = new Dictionary <ISender, PeerSecAssociation>();
_spi[SPI] = sender_to_sa;
}
if (sender_to_sa.ContainsKey(Sender))
{
sa = sender_to_sa[Sender];
}
else
{
sa = new PeerSecAssociation(Sender, _ch, SPI);
sa.Subscribe(this, null);
sa.StateChangeEvent += SAStateChange;
sa.RequestUpdate += SARequestUpdate;
sender_to_sa[Sender] = sa;
}
}
if (start && sa.State != SecurityAssociation.States.Active)
{
StartSA(sa);
}
return(sa);
}
/// <summary>1b) Receive a Cookie which responds with a CookieResponse</summary>
/// <param name="sa">A security association that we wish to perform the
/// specified control operation on.</param>
/// <param name="calc_cookie">Cookie value for the association sender.</param>
/// <param name="scm">The received SecurityControlMessage.</param>
/// <param name="scm_reply">A prepared reply message (with headers and such.</param>
/// <param name="return_path">Where to send the result.</param>
/// <param name="low_level_sender">We expect the return_path to not be an edge or
/// some other type of "low level" sender, so this contains the parsed out value.</param>
protected void HandleControlCookie(PeerSecAssociation sa,
MemBlock calc_cookie, SecurityControlMessage scm,
SecurityControlMessage scm_reply, ISender return_path,
ISender low_level_sender)
{
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received Cookie from: " + low_level_sender);
scm_reply.Type = SecurityControlMessage.MessageType.CookieResponse;
scm_reply.RemoteCookie = scm.LocalCookie;
scm_reply.LocalCookie = calc_cookie;
if (SecurityPolicy.GetPolicy(scm.SPI).PreExchangedKeys)
{
scm_reply.CAs = new List <MemBlock>(0);
}
else
{
scm_reply.CAs = _ch.SupportedCAs;
}
ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);
return_path.Send(to_send);
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful Cookie from: " + low_level_sender);
}
/// <summary>This is SecureData that needs to get to an SA.</summary>
protected void HandleData(MemBlock b, ISender return_path)
{
SecurityDataMessage sdm = new SecurityDataMessage(b);
Dictionary <ISender, PeerSecAssociation> sender_to_sa = null;
PeerSecAssociation sa = null;
try {
sender_to_sa = _spi[sdm.SPI];
sa = sender_to_sa[return_path];
sa.HandleData(b, return_path, null);
} catch (Exception e) {
if (sender_to_sa == null && !SecurityPolicy.Supports(sdm.SPI))
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"Unsupported SPI, from {0}, message: {1}", return_path, sdm));
}
else
{
if (sa == null)
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"No SA, from {0}, message: {1}", return_path, sdm));
}
else if (sa.Closed)
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"SA, {0}, has been closed, from {1}, message: {2}.", sa,
return_path, sdm));
}
else
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"SA, {0}, from {1}, message: {2}, causes unhandled exception : {3}",
sa, return_path, sdm, e));
}
NoSuchSA(sdm.SPI, return_path);
}
}
}
/// <summary>2b) Receive a DHEWithCertificateAndCAs, verify the certificate and attempt
/// to find a matching Certificate for the list of CAs, if you find one,
/// finish the DHE handshake and send the certificate via a DHEWithCertificate</summary>
/// <param name="sa">A security association that we wish to perform the
/// specified control operation on.</param>
/// <param name="scm">The received SecurityControlMessage.</param>
/// <param name="scm_reply">A prepared reply message (with headers and such.</param>
/// <param name="return_path">Where to send the result.</param>
/// <param name="low_level_sender">We expect the return_path to not be an edge or
/// some other type of "low level" sender, so this contains the parsed out value.</param>
protected void HandleControlDHEWithCertificateAndCAs(PeerSecAssociation sa,
SecurityControlMessage scm, SecurityControlMessage scm_reply,
ISender return_path, ISender low_level_sender)
{
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received DHEWithCertificateAndCAs from: " + low_level_sender);
if(sa == null) {
sa = CreateSecurityAssociation(low_level_sender, scm.SPI, false);
}
byte[] cert = new byte[scm.Certificate.Length];
scm.Certificate.CopyTo(cert, 0);
X509Certificate rcert = new X509Certificate(cert);
_ch.Verify(rcert, low_level_sender);
HashAlgorithm sha1 = new SHA1CryptoServiceProvider();
scm.Verify((RSACryptoServiceProvider) rcert.RSA, sha1);
X509Certificate lcert = null;
if(SecurityPolicy.GetPolicy(scm.SPI).PreExchangedKeys) {
lcert = _ch.DefaultCertificate;
} else {
lcert = _ch.FindCertificate(scm.CAs);
}
sa.LocalCertificate = lcert;
sa.RemoteCertificate = rcert;
sa.RDHE.Value = scm.DHE;
sa.DHEWithCertificateAndCAsInHash.Value = MemBlock.Reference(sha1.ComputeHash((byte[]) scm.Packet));
scm_reply.LocalCookie = scm.RemoteCookie;
scm_reply.RemoteCookie = scm.LocalCookie;
scm_reply.DHE = sa.LDHE;
scm_reply.Certificate = MemBlock.Reference(lcert.RawData);
scm_reply.Type = SecurityControlMessage.MessageType.DHEWithCertificate;
lock(_private_key_lock) {
scm_reply.Sign(_private_key, sha1);
}
sa.DHEWithCertificateHash.Value = MemBlock.Reference(sha1.ComputeHash((byte[]) scm_reply.Packet));
ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);
return_path.Send(to_send);
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful DHEWithCertificateAndCAs from: " + low_level_sender);
}
/// <summary>2a) Receive a CookieResponse that contains a list of CAs, if you have
/// a Certificate that supports one of the CAs send it along with a DHE
/// and a list of your supported CAs in a DHEWithCertificateAndCAs.</summary>
/// <param name="sa">A security association that we wish to perform the
/// specified control operation on.</param>
/// <param name="scm">The received SecurityControlMessage.</param>
/// <param name="scm_reply">A prepared reply message (with headers and such.</param>
/// <param name="return_path">Where to send the result.</param>
/// <param name="low_level_sender">We expect the return_path to not be an edge or
/// some other type of "low level" sender, so this contains the parsed out value.</param>
protected void HandleControlCookieResponse(PeerSecAssociation sa,
SecurityControlMessage scm, SecurityControlMessage scm_reply,
ISender return_path, ISender low_level_sender)
{
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received CookieResponse from: " + low_level_sender);
if(sa == null) {
throw new Exception("No valid SA!");
}
// This seems like unnecessary code
scm_reply.Type = SecurityControlMessage.MessageType.CookieResponse;
X509Certificate lcert = null;
if(SecurityPolicy.GetPolicy(scm.SPI).PreExchangedKeys) {
lcert = _ch.DefaultCertificate;
} else {
lcert = _ch.FindCertificate(scm.CAs);
}
sa.RemoteCookie.Value = scm.LocalCookie;
sa.LocalCertificate = lcert;
scm_reply.Certificate = lcert.RawData;
scm_reply.DHE = sa.LDHE;
scm_reply.LocalCookie = scm.RemoteCookie;
scm_reply.RemoteCookie = scm.LocalCookie;
scm_reply.Type = SecurityControlMessage.MessageType.DHEWithCertificateAndCAs;
if(SecurityPolicy.GetPolicy(scm.SPI).PreExchangedKeys) {
scm_reply.CAs = new List<MemBlock>(0);
} else {
scm_reply.CAs = _ch.SupportedCAs;
}
HashAlgorithm sha1 = new SHA1CryptoServiceProvider();
lock(_private_key_lock) {
scm_reply.Sign(_private_key, sha1);
}
sa.DHEWithCertificateAndCAsOutHash.Value = sha1.ComputeHash((byte[]) scm_reply.Packet);
ICopyable to_send = new CopyList(Security, SecureControl, scm_reply.Packet);
_rrman.SendRequest(return_path, ReqrepManager.ReqrepType.Request,
to_send, this, sa);
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful CookieResponse from: " + low_level_sender);
}
/// <summary>1b) Receive a Cookie which responds with a CookieResponse</summary>
/// <param name="sa">A security association that we wish to perform the
/// specified control operation on.</param>
/// <param name="calc_cookie">Cookie value for the association sender.</param>
/// <param name="scm">The received SecurityControlMessage.</param>
/// <param name="scm_reply">A prepared reply message (with headers and such.</param>
/// <param name="return_path">Where to send the result.</param>
/// <param name="low_level_sender">We expect the return_path to not be an edge or
/// some other type of "low level" sender, so this contains the parsed out value.</param>
protected void HandleControlCookie(PeerSecAssociation sa,
MemBlock calc_cookie, SecurityControlMessage scm,
SecurityControlMessage scm_reply, ISender return_path,
ISender low_level_sender)
{
ProtocolLog.WriteIf(ProtocolLog.Security, String.Format(
"{0}, Received Cookie from: {1}, In-Cookie: {2}",
GetHashCode(), low_level_sender, scm.LocalCookie));
scm_reply.Type = SecurityControlMessage.MessageType.CookieResponse;
scm_reply.RemoteCookie = scm.LocalCookie;
scm_reply.LocalCookie = calc_cookie;
if(SecurityPolicy.GetPolicy(scm.SPI).PreExchangedKeys) {
scm_reply.CAs = new List<MemBlock>(0);
} else {
scm_reply.CAs = _ch.SupportedCAs;
}
ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);
return_path.Send(to_send);
ProtocolLog.WriteIf(ProtocolLog.Security, String.Format(
"{0}, Successful Cookie from: {1}, Out-Cookie: {2}",
GetHashCode(), low_level_sender, calc_cookie));
}
/// <summary>1a) Send a Cookie</summary>
/// <param name="sa">A security association that we wish to perform the
/// specified control operation on.</param>
protected void HandleControlNoSuchSA(PeerSecAssociation sa)
{
if(sa == null) {
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " NoSuchSA received, but we have no SA either!");
} else {
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " NoSuchSA received, handling...");
StartSA(sa);
}
}
/// <summary>This begins the SecurityAssociation exchange protocol over the
/// specified SecurityAssociation.</summary>
protected void StartSA(PeerSecAssociation sa) {
SecurityControlMessage scm_reply = new SecurityControlMessage();
scm_reply.Version = Version;
scm_reply.SPI = sa.SPI;
scm_reply.Type = SecurityControlMessage.MessageType.Cookie;
scm_reply.LocalCookie = CalculateCookie(sa.Sender);
ICopyable to_send = new CopyList(Security, SecureControl, scm_reply.Packet);
_rrman.SendRequest(sa.Sender, ReqrepManager.ReqrepType.Request,
to_send, this, sa);
}
/// <summary>This (idempotently) returns a new SecurityAssociation for the
/// specified sender using the specified SA.</summary>
virtual protected PeerSecAssociation CreateSecurityAssociation(ISender Sender,
int SPI, bool start)
{
if(!SecurityPolicy.Supports(SPI)) {
throw new Exception("Unsupported SPI");
}
PeerSecAssociation sa = null;
lock(_sync) {
Dictionary<ISender, PeerSecAssociation> sender_to_sa = null;
if(_spi.ContainsKey(SPI)) {
sender_to_sa = _spi[SPI];
} else {
sender_to_sa = new Dictionary<ISender, PeerSecAssociation>();
_spi[SPI] = sender_to_sa;
}
if(sender_to_sa.ContainsKey(Sender)) {
sa = sender_to_sa[Sender];
} else {
sa = new PeerSecAssociation(Sender, _ch, SPI);
sa.Subscribe(this, null);
sa.StateChangeEvent += SAStateChange;
sa.RequestUpdate += SARequestUpdate;
sender_to_sa[Sender] = sa;
}
}
if(start && sa.State != SecurityAssociation.States.Active && sa.Start()) {
StartSA(sa);
}
return sa;
}
/// <summary>This is the control state machine. There are three paths in
/// the state machine, iniator, receiver, and bidirectional. The
/// bidirectional case occurs when two remote ISenders that are matched
/// together initiate a handshake at the same time, otherwise the initiator
/// /receiver pattern is followed. The high level overview for the states
/// are:
/// 1a) Send a Cookie
/// 1b) Receive a Cookie which responds with a CookieResponse
/// 2a) Receive a CookieResponse that contains a list of CAs, if you have
/// a Certificate that supports one of the CAs send it along with a DHE
/// and a list of your supported CAs in a DHEWithCertificateAndCAs.
/// 2b) Receive a DHEWithCertificateAndCAs, verify the certificate and attempt
/// to find a matching Certificate for the list of CAs, if you find one,
/// finish the DHE handshake and send the certificate via a DHEWithCertificate
/// 3a) Receive a DHEWithCertificate, verify the certificate and DHE and
/// send a Confirm that you are ready to Verify the stack and start the
/// system.
/// 3b) Receive a Confirm, verify the entire stack and send a Confirm
/// 4a)Receive a Confirm, verify the entire stack and all set to go
/// </summary>
protected void HandleControl(MemBlock b, ISender return_path)
{
ISender low_level_sender = return_path;
if (low_level_sender is ReqrepManager.ReplyState)
{
low_level_sender = ((ReqrepManager.ReplyState)low_level_sender).ReturnPath;
}
SecurityControlMessage scm = new SecurityControlMessage(b);
MemBlock calc_cookie = CalculateCookie(low_level_sender);
if (scm.Version != Version)
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"Invalid version expected {0}, found {1}, from {2}, message: {3}",
Version, scm.Version, low_level_sender, scm));
return;
}
else if (!SecurityPolicy.Supports(scm.SPI))
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"Unsupported SPI, from {0}, message: {1}", low_level_sender, scm));
return;
}
else if ((scm.Type != SecurityControlMessage.MessageType.Cookie &&
scm.Type != SecurityControlMessage.MessageType.NoSuchSA) &&
!scm.RemoteCookie.Equals(calc_cookie))
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"Invalid cookie, Expected {0}, Found {1}, From {2}, Message {3}",
calc_cookie, scm.RemoteCookie, low_level_sender, scm));
return;
}
SecurityControlMessage scm_reply = new SecurityControlMessage();
scm_reply.Version = Version;
scm_reply.SPI = scm.SPI;
PeerSecAssociation sa = null;
// This can be in a try statement since this is best effort anyway
try {
Dictionary <ISender, PeerSecAssociation> sender_to_sa = _spi[scm.SPI];
sa = sender_to_sa[low_level_sender];
} catch { }
if (sa != null)
{
// Reset cases where no state has been set yet or state is attempting
// to be re-established, if other message types arrive, they will
// expect pre-set state and will fail. The mechanisms instilled thus
// far should prevent this, but this makes it explicit. Now only
// wayward messages will arrive to other states.
if (scm.Type == SecurityControlMessage.MessageType.NoSuchSA ||
scm.Type == SecurityControlMessage.MessageType.Cookie ||
scm.Type == SecurityControlMessage.MessageType.CookieResponse ||
scm.Type == SecurityControlMessage.MessageType.DHEWithCertificateAndCAs)
{
sa.TryReset();
}
if (sa.Closed)
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, GetHashCode() + " SA closed, clearing SA state! " + sa);
sa = null;
}
else if (sa.State == SecurityAssociation.States.Active &&
// Two nodes can demand a confirm at the same time, if this
// message doesn't pass, then one side will close due to timeout
scm.Type != SecurityControlMessage.MessageType.Confirm)
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"{0}, {1}: {2}", GetHashCode(), "SA Active, received message",
scm.Type));
return;
}
}
try {
switch (scm.Type)
{
case SecurityControlMessage.MessageType.NoSuchSA:
HandleControlNoSuchSA(sa);
break;
case SecurityControlMessage.MessageType.Cookie:
HandleControlCookie(sa, calc_cookie, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.CookieResponse:
HandleControlCookieResponse(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.DHEWithCertificateAndCAs:
HandleControlDHEWithCertificateAndCAs(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.DHEWithCertificate:
HandleControlDHEWithCertificate(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.Confirm:
HandleControlConfirm(sa, scm, scm_reply, return_path, low_level_sender);
break;
default:
throw new Exception("Invalid message!");
}
} catch (Exception e) {
if (scm.Type == SecurityControlMessage.MessageType.DHEWithCertificateAndCAs ||
scm.Type == SecurityControlMessage.MessageType.DHEWithCertificate ||
scm.Type == SecurityControlMessage.MessageType.Confirm)
{
NoSuchSA(scm.SPI, return_path);
}
if (sa != null && sa.Closed)
{
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, GetHashCode() + " SA closed! " + sa);
return;
}
ProtocolLog.WriteIf(ProtocolLog.SecurityExceptions, String.Format(
"Error in {0}, unhandled exception from {1}, message: {2}, exception: {3}",
GetHashCode(), low_level_sender, scm, e));
}
}
public void SHUpdateTest() {
callback_count = 0;
int spi = SecurityPolicy.DefaultSPI;
MockSender sender1 = new MockSender(null, null, null, 2);
MockSender sender2 = new MockSender(null, null, null, 2);
PeerSecAssociation sa1 = new PeerSecAssociation(sender1, null, spi);
sa1.StateChangeEvent += StateChange;
sender2.Receiver = sa1;
MockDataHandler mdh1 = new MockDataHandler();
sa1.Subscribe(mdh1, null);
PeerSecAssociation sa2 = new PeerSecAssociation(sender2, null, spi);
sender1.Receiver = sa2;
MockDataHandler mdh2 = new MockDataHandler();
sa2.Subscribe(mdh2, null);
Setup(sa1, sa2);
sa1.RequestUpdate += Callback;
sa2.RequestUpdate += Callback;
byte[] b = null;
Random rand = new Random();
MemBlock mb = null;
int current_epoch = sa1.CurrentEpoch;
for(int i = 0; i < 80; i++) {
b = new byte[128];
rand.NextBytes(b);
mb = MemBlock.Reference(b);
sa1.Send(mb);
Assert.IsTrue(mdh2.Contains(mb), "Contains" + i);
if(i % 20 == 0 && i != 0) {
Assert.AreEqual(callback_count, 1, "Callback count " + i);
callback_count = 0;
Setup(sa1, sa2);
} else {
if(i % 20 == 1 && i != 1) {
Assert.IsFalse(current_epoch == sa1.CurrentEpoch, "Current epoch " + i);
current_epoch = sa1.CurrentEpoch;
}
Assert.AreEqual(current_epoch, sa1.CurrentEpoch, "Current epoch " + i);
}
}
}
public void Test() {
int spi = SecurityPolicy.DefaultSPI;
MockSender sender1 = new MockSender(null, null, null, 2);
MockSender sender2 = new MockSender(null, null, null, 2);
PeerSecAssociation sa1 = new PeerSecAssociation(sender1, null, spi);
sa1.StateChangeEvent += StateChange;
sender2.Receiver = sa1;
MockDataHandler mdh1 = new MockDataHandler();
sa1.Subscribe(mdh1, null);
PeerSecAssociation sa2 = new PeerSecAssociation(sender2, null, spi);
sender1.Receiver = sa2;
MockDataHandler mdh2 = new MockDataHandler();
sa2.Subscribe(mdh2, null);
byte[] b = null;
Random rand = new Random();
MemBlock mb = null;
int current_epoch = sa1.CurrentEpoch;
for(int i = 0; i < 5; i++) {
Setup(sa1, sa2);
b = new byte[128];
rand.NextBytes(b);
mb = MemBlock.Reference(b);
sa1.Send(mb);
Assert.IsTrue(mdh2.Contains(mb), "Contains" + i);
Assert.AreEqual(state, sa1.State, "State == Active" + i);
Assert.IsFalse(current_epoch == sa1.CurrentEpoch, "Current epoch " + i);
current_epoch = sa1.CurrentEpoch;
}
sa1.CheckState();
sa1.CheckState();
b = new byte[128];
rand.NextBytes(b);
mb = MemBlock.Reference(b);
try {
sa1.Send(mb);
} catch {}
Assert.IsTrue(!mdh2.Contains(mb), "Failed!");
Assert.AreEqual(state, sa1.State, "State == Failed");
}
/// <summary>This is the control state machine. There are three paths in
/// the state machine, iniator, receiver, and bidirectional. The
/// bidirectional case occurs when two remote ISenders that are matched
/// together initiate a handshake at the same time, otherwise the initiator
/// /receiver pattern is followed. The high level overview for the states
/// are:
/// 1a) Send a Cookie
/// 1b) Receive a Cookie which responds with a CookieResponse
/// 2a) Receive a CookieResponse that contains a list of CAs, if you have
/// a Certificate that supports one of the CAs send it along with a DHE
/// and a list of your supported CAs in a DHEWithCertificateAndCAs.
/// 2b) Receive a DHEWithCertificateAndCAs, verify the certificate and attempt
/// to find a matching Certificate for the list of CAs, if you find one,
/// finish the DHE handshake and send the certificate via a DHEWithCertificate
/// 3a) Receive a DHEWithCertificate, verify the certificate and DHE and
/// send a Confirm that you are ready to Verify the stack and start the
/// system.
/// 3b) Receive a Confirm, verify the entire stack and send a Confirm
/// 4a)Receive a Confirm, verify the entire stack and all set to go
/// </summary>
protected void HandleControl(MemBlock b, ISender return_path)
{
ISender low_level_sender = return_path;
if (low_level_sender is ReqrepManager.ReplyState)
{
low_level_sender = ((ReqrepManager.ReplyState)low_level_sender).ReturnPath;
}
SecurityControlMessage scm = new SecurityControlMessage(b);
MemBlock calc_cookie = CalculateCookie(low_level_sender);
if (scm.Version != Version)
{
throw new Exception("Invalid version: " + scm.Version);
}
else if (!SecurityPolicy.Supports(scm.SPI))
{
throw new Exception("No support for SPI: " + scm.SPI);
}
else if (!scm.RemoteCookie.Equals(calc_cookie))
{
if (scm.Type != SecurityControlMessage.MessageType.Cookie &&
scm.Type != SecurityControlMessage.MessageType.NoSuchSA)
{
throw new Exception("Invalid cookie!");
}
}
SecurityControlMessage scm_reply = new SecurityControlMessage();
scm_reply.Version = Version;
scm_reply.SPI = scm.SPI;
PeerSecAssociation sa = null;
// This can be in a try statement since this is best effort anyway
try {
Dictionary <ISender, PeerSecAssociation> sender_to_sa = _spi[scm.SPI];
sa = sender_to_sa[low_level_sender];
} catch { }
if (sa != null)
{
sa.Reset();
if (sa.Closed)
{
throw new Exception("SA closed!");
}
else if (sa.State == SecurityAssociation.States.Active)
{
return;
}
}
try {
switch (scm.Type)
{
case SecurityControlMessage.MessageType.NoSuchSA:
HandleControlNoSuchSA(sa);
break;
case SecurityControlMessage.MessageType.Cookie:
HandleControlCookie(sa, calc_cookie, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.CookieResponse:
HandleControlCookieResponse(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.DHEWithCertificateAndCAs:
HandleControlDHEWithCertificateAndCAs(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.DHEWithCertificate:
HandleControlDHEWithCertificates(sa, scm, scm_reply, return_path, low_level_sender);
break;
case SecurityControlMessage.MessageType.Confirm:
HandleControlConfirm(sa, scm, scm_reply, return_path, low_level_sender);
break;
default:
throw new Exception("Invalid message!");
}
} catch {
if (sa != null && sa.Closed)
{
throw new Exception("SA closed.");
}
else
{
throw;
}
}
}
/// <summary>3a) Receive a DHEWithCertificate, verify the certificate and DHE and
/// send a Confirm that you are ready to Verify the stack and start the
/// system.</summary>
/// <param name="sa">A security association that we wish to perform the
/// specified control operation on.</param>
/// <param name="scm">The received SecurityControlMessage.</param>
/// <param name="scm_reply">A prepared reply message (with headers and such.</param>
/// <param name="return_path">Where to send the result.</param>
/// <param name="low_level_sender">We expect the return_path to not be an edge or
/// some other type of "low level" sender, so this contains the parsed out value.</param>
protected void HandleControlDHEWithCertificate(PeerSecAssociation sa,
SecurityControlMessage scm, SecurityControlMessage scm_reply,
ISender return_path, ISender low_level_sender)
{
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received DHEWithCertificate from: " + low_level_sender);
if(sa == null) {
throw new Exception("No valid SA!");
}
byte[] cert = new byte[scm.Certificate.Length];
scm.Certificate.CopyTo(cert, 0);
X509Certificate rcert = new X509Certificate(cert);
HashAlgorithm sha1 = new SHA1CryptoServiceProvider();
scm.Verify((RSACryptoServiceProvider) rcert.RSA, sha1);
_ch.Verify(rcert, low_level_sender);
sa.RemoteCertificate = rcert;
sa.RDHE.Value = scm.DHE;
scm_reply.LocalCookie = scm.RemoteCookie;
scm_reply.RemoteCookie = scm.LocalCookie;
scm_reply.Hash = MemBlock.Reference(sha1.ComputeHash((byte[]) scm.Packet));
scm_reply.Type = SecurityControlMessage.MessageType.Confirm;
lock(_private_key_lock) {
scm_reply.Sign(_private_key, sha1);
}
ICopyable to_send = new CopyList(Security, SecureControl, scm_reply.Packet);
_rrman.SendRequest(return_path, ReqrepManager.ReqrepType.Request,
to_send, this, sa);
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful DHEWithCertificate from: " + low_level_sender);
}
/// <summary>3b) Receive a Confirm, verify the entire stack and send a Confirm
/// 4a)Receive a Confirm, verify the entire stack and all set to go</summary>
/// <param name="sa">A security association that we wish to perform the
/// specified control operation on.</param>
/// <param name="scm">The received SecurityControlMessage.</param>
/// <param name="scm_reply">A prepared reply message (with headers and such.</param>
/// <param name="return_path">Where to send the result.</param>
/// <param name="low_level_sender">We expect the return_path to not be an edge or
/// some other type of "low level" sender, so this contains the parsed out value.</param>
protected void HandleControlConfirm(PeerSecAssociation sa,
SecurityControlMessage scm, SecurityControlMessage scm_reply,
ISender return_path, ISender low_level_sender)
{
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received Confirm from: " + low_level_sender);
if(sa == null) {
throw new Exception("No valid SA!");
}
HashAlgorithm sha1 = new SHA1CryptoServiceProvider();
scm.Verify((RSACryptoServiceProvider) sa.RemoteCertificate.RSA, sha1);
if(return_path == low_level_sender) {
sa.VerifyResponse(scm.Hash);
} else {
sa.VerifyRequest(scm.Hash);
scm_reply.LocalCookie = scm.RemoteCookie;
scm_reply.RemoteCookie = scm.LocalCookie;
scm_reply.Hash = sa.DHEWithCertificateAndCAsInHash.Value;
scm_reply.Type = SecurityControlMessage.MessageType.Confirm;
lock(_private_key_lock) {
scm_reply.Sign(_private_key, sha1);
}
ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);
return_path.Send(to_send);
}
sa.Enable();
ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful Confirm from: " + low_level_sender);
}
protected void Setup(PeerSecAssociation sa1, PeerSecAssociation sa2) {
sa1.Reset();
sa2.Reset();
sa1.RDHE.Value = sa2.LDHE;
sa2.RDHE.Value = sa1.LDHE;
Random rand = new Random();
byte[] b = new byte[128];
rand.NextBytes(b);
MemBlock mb = MemBlock.Reference(b);
sa1.DHEWithCertificateAndCAsOutHash.Value = mb;
sa1.VerifyResponse(mb);
b = new byte[128];
rand.NextBytes(b);
mb = MemBlock.Reference(b);
sa2.DHEWithCertificateHash.Value = mb;
sa2.VerifyRequest(mb);
sa1.Enable();
sa2.Enable();
// This is just for kicks
sa1.Enable();
}