removed key derivation rate entirely

added new role based label
updated configs and manpages

22 files changed, 173 insertions, 125 deletions

diff --git a/cmd-option-letters b/cmd-option-letters
index b9c8eae..5533d21 100644
--- a/cmd-option-letters
+++ b/cmd-option-letters
@@ -5,7 +5,7 @@ a: auth algo
 b: auth tag length (not yet)
 c: cipher
 d: device name
-e:
+e: role
 f: input file
 g: unix group
 h: print help text
diff --git a/etc/anytun/client1/config b/etc/anytun/client1/config
index 8e7970a..3f19a85 100644
--- a/etc/anytun/client1/config
+++ b/etc/anytun/client1/config
@@ -2,6 +2,8 @@
 ## Main options             #
 #############################
 
+role client
+
 ## Client ID
 ##  (has to be unique for each client)
 mux 1
diff --git a/etc/anytun/client2/config b/etc/anytun/client2/config
index a33419e..ff6b809 100644
--- a/etc/anytun/client2/config
+++ b/etc/anytun/client2/config
@@ -2,6 +2,8 @@
 ## Main options             #
 #############################
 
+role client
+
 ## Client ID
 ##  (has to be unique for each client)
 mux 2
diff --git a/etc/anytun/client3/config b/etc/anytun/client3/config
index 5799470..670ae85 100644
--- a/etc/anytun/client3/config
+++ b/etc/anytun/client3/config
@@ -2,6 +2,8 @@
 ## Main options             #
 #############################
 
+role client
+
 ## Client ID
 ##  (has to be unique for each client)
 mux 3
diff --git a/etc/anytun/p2p-a/config b/etc/anytun/p2p-a/config
index 1fa5763..59c35e6 100644
--- a/etc/anytun/p2p-a/config
+++ b/etc/anytun/p2p-a/config
@@ -2,6 +2,8 @@
 ## Main options             #
 #############################
 
+role alice
+
 ## device type tun = ip/ipv6, tap = ethernet
 type tun
 
diff --git a/etc/anytun/p2p-b/config b/etc/anytun/p2p-b/config
index 340545a..3a92711 100644
--- a/etc/anytun/p2p-b/config
+++ b/etc/anytun/p2p-b/config
@@ -2,6 +2,8 @@
 ## Main options             #
 #############################
 
+role bob
+
 ## device type tun = ip/ipv6, tap = ethernet
 type tun
 
diff --git a/etc/anytun/server/conf.d/client1 b/etc/anytun/server/conf.d/client1
index fd56071..5099cef 100644
--- a/etc/anytun/server/conf.d/client1
+++ b/etc/anytun/server/conf.d/client1
@@ -2,6 +2,8 @@
 ## main options             #
 #############################
 
+role server
+
 ## Client ID
 ##  (has to be unique for each client)
 mux 1
diff --git a/etc/anytun/server/conf.d/client2 b/etc/anytun/server/conf.d/client2
index 59d2e21..e0b05d2 100644
--- a/etc/anytun/server/conf.d/client2
+++ b/etc/anytun/server/conf.d/client2
@@ -2,6 +2,8 @@
 ## main options             #
 #############################
 
+role server
+
 ## Client ID
 ##  (has to be unique for each client)
 mux 2
diff --git a/etc/anytun/server/conf.d/client3 b/etc/anytun/server/conf.d/client3
index a3a4fa0..8f22de0 100644
--- a/etc/anytun/server/conf.d/client3
+++ b/etc/anytun/server/conf.d/client3
@@ -2,6 +2,8 @@
 ## main options             #
 #############################
 
+role server
+
 ## Client ID
 ##  (has to be unique for each client)
 mux 3
diff --git a/src/anytun-config.cpp b/src/anytun-config.cpp
index cafb753..466c36f 100644
--- a/src/anytun-config.cpp
+++ b/src/anytun-config.cpp
@@ -53,15 +53,16 @@ void createConnection(const PacketSourceEndpoint & remote_end, ConnectionList &
 {
   SeqWindow * seq = new SeqWindow(seqSize);
   seq_nr_t seq_nr_ = 0;
-  KeyDerivation * kd = KeyDerivationFactory::create( gOpt.getKdPrf() , gOpt.getAnytun02Compat() );
-  kd->init( gOpt.getKey(), gOpt.getSalt() );
+  KeyDerivation * kd = KeyDerivationFactory::create(gOpt.getKdPrf(), gOpt.getAnytun02Compat());
+  kd->init(gOpt.getKey(), gOpt.getSalt(), gOpt.getPassphrase());
+  kd->setRole(gOpt.getRole());
   cLog.msg(Log::PRIO_NOTICE) << "added connection remote host " << remote_end;
-  ConnectionParam connparam ( (*kd), (*seq), seq_nr_, remote_end );
-  cl.addConnection( connparam, mux );
+  ConnectionParam connparam ((*kd), (*seq), seq_nr_, remote_end);
+  cl.addConnection(connparam, mux);
 
   std::ostringstream sout;
-  boost::archive::text_oarchive oa( sout );
-  const SyncCommand scom( cl, mux );
+  boost::archive::text_oarchive oa(sout);
+  const SyncCommand scom(cl, mux);
 
   oa << scom;
   std::cout <<  std::setw(5) << std::setfill('0') << sout.str().size()<< ' ' << sout.str() << std::endl;
@@ -70,14 +71,14 @@ void createConnection(const PacketSourceEndpoint & remote_end, ConnectionList &
   NetworkList::const_iterator rit;
   for(rit = routes.begin(); rit != routes.end(); ++rit)
   {
-    NetworkAddress addr( rit->net_addr.c_str() );
-    NetworkPrefix prefix( addr, rit->prefix_length );
+    NetworkAddress addr(rit->net_addr.c_str());
+    NetworkPrefix prefix(addr, rit->prefix_length);
     
-    gRoutingTable.addRoute( prefix, mux );
+    gRoutingTable.addRoute(prefix, mux);
     
     std::ostringstream sout2;
-    boost::archive::text_oarchive oa2( sout2 );
-    const SyncCommand scom2( prefix );
+    boost::archive::text_oarchive oa2(sout2);
+    const SyncCommand scom2(prefix);
     
     oa2 << scom2;
     std::cout <<  std::setw(5) << std::setfill('0') << sout2.str().size()<< ' ' << sout2.str() << std::endl;
diff --git a/src/anytun.cpp b/src/anytun.cpp
index ef46a5e..c19ceb5 100644
--- a/src/anytun.cpp
+++ b/src/anytun.cpp
@@ -86,7 +86,7 @@ void createConnection(const PacketSourceEndpoint & remote_end, window_size_t seq
 	seq_nr_t seq_nr_=0;
   KeyDerivation * kd = KeyDerivationFactory::create(gOpt.getKdPrf(), gOpt.getAnytun02Compat());
   kd->init(gOpt.getKey(), gOpt.getSalt(), gOpt.getPassphrase());
-  kd->setLogKDRate(gOpt.getLdKdr());
+  kd->setRole(gOpt.getRole());
   cLog.msg(Log::PRIO_NOTICE) << "added connection remote host " << remote_end;
 
 	ConnectionParam connparam ((*kd), (*seq), seq_nr_, remote_end);
@@ -419,7 +419,6 @@ int main(int argc, char* argv[])
     cLog.msg(Log::PRIO_NOTICE) << "anytun started...";
     gOpt.parse_post(); // print warnings
 
-
         // daemonizing has to done before any thread gets started
 #ifndef NO_DAEMON
 #ifndef NO_PRIVDROP
diff --git a/src/authAlgo.cpp b/src/authAlgo.cpp
index 3f63c86..49974ee 100644
--- a/src/authAlgo.cpp
+++ b/src/authAlgo.cpp
@@ -86,7 +86,7 @@ void Sha1AuthAlgo::generate(KeyDerivation& kd, EncryptedPacket& packet)
   if(!packet.getAuthTagLength())
     return;
   
-  kd.generate(dir_, LABEL_SATP_MSG_AUTH, packet.getSeqNr(), key_);
+  kd.generate(dir_, LABEL_AUTH, packet.getSeqNr(), key_);
 #ifndef USE_SSL_CRYPTO
   gcry_error_t err = gcry_md_setkey(handle_, key_.getBuf(), key_.getLength());
   if(err) {
@@ -126,7 +126,7 @@ bool Sha1AuthAlgo::checkTag(KeyDerivation& kd, EncryptedPacket& packet)
   if(!packet.getAuthTagLength())
     return true;
 
-  kd.generate(dir_, LABEL_SATP_MSG_AUTH, packet.getSeqNr(), key_);
+  kd.generate(dir_, LABEL_AUTH, packet.getSeqNr(), key_);
 #ifndef USE_SSL_CRYPTO
   gcry_error_t err = gcry_md_setkey(handle_, key_.getBuf(), key_.getLength());
   if(err) {
diff --git a/src/cipher.cpp b/src/cipher.cpp
index 3524052..15c9af2 100644
--- a/src/cipher.cpp
+++ b/src/cipher.cpp
@@ -140,7 +140,7 @@ u_int32_t AesIcmCipher::decipher(KeyDerivation& kd, u_int8_t* in, u_int32_t ilen
 
 void AesIcmCipher::calcCtr(KeyDerivation& kd, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux)
 {
-  kd.generate(dir_, LABEL_SATP_SALT, seq_nr, salt_);
+  kd.generate(dir_, LABEL_SALT, seq_nr, salt_);
 
 
   if(anytun02_compat_) {
@@ -164,7 +164,7 @@ void AesIcmCipher::calc(KeyDerivation& kd, u_int8_t* in, u_int32_t ilen, u_int8_
     return;
 #endif
 
-  kd.generate(dir_, LABEL_SATP_ENCRYPTION, seq_nr, key_);
+  kd.generate(dir_, LABEL_ENC, seq_nr, key_);
 #ifdef USE_SSL_CRYPTO
   int ret = AES_set_encrypt_key(key_.getBuf(), key_.getLength()*8, &aes_key_);
   if(ret) {
diff --git a/src/connectionList.cpp b/src/connectionList.cpp
index dd3fa6c..b21102a 100644
--- a/src/connectionList.cpp
+++ b/src/connectionList.cpp
@@ -130,7 +130,7 @@ ConnectionParam & ConnectionList::getOrNewConnectionUnlocked(u_int16_t mux)
   seq_nr_t seq_nr_=0;
   KeyDerivation * kd = KeyDerivationFactory::create(gOpt.getKdPrf(), gOpt.getAnytun02Compat());
   kd->init(Buffer(key, sizeof(key)), Buffer(salt, sizeof(salt)));
-  ConnectionParam conn ( (*kd),  (*seq), seq_nr_, PacketSourceEndpoint());
+  ConnectionParam conn ((*kd), (*seq), seq_nr_, PacketSourceEndpoint());
 	connections_.insert(ConnectionMap::value_type(mux, conn));
 	it = connections_.find(mux);
 	return it->second;
diff --git a/src/datatypes.h b/src/datatypes.h
index 23bdde6..141aae3 100644
--- a/src/datatypes.h
+++ b/src/datatypes.h
@@ -51,6 +51,7 @@ typedef u_int32_t seq_nr_t;
 typedef u_int16_t sender_id_t;
 typedef u_int16_t payload_type_t;
 typedef u_int16_t mux_t;
+typedef u_int32_t satp_prf_label_t;
 
 typedef enum { ANY, IPV4_ONLY, IPV6_ONLY } ResolvAddrType;
 
diff --git a/src/endian.h b/src/endian.h
index b4cc995..9d96126 100644
--- a/src/endian.h
+++ b/src/endian.h
@@ -50,6 +50,9 @@
 #define MUX_T_NTOH(a) ntohs(a)
 #define MUX_T_HTON(a) htons(a)
 
+#define SATP_PRF_LABEL_T_NTOH(a) ntohl(a)
+#define SATP_PRF_LABEL_T_HTON(a) htonl(a)
+
 //#define AUTH_TAG_T_NTOH(a) ntohl(a)
 //#define AUTH_TAG_T_HTON(a) htonl(a)
 
diff --git a/src/keyDerivation.cpp b/src/keyDerivation.cpp
index 75c49ae..2e9dd94 100644
--- a/src/keyDerivation.cpp
+++ b/src/keyDerivation.cpp
@@ -50,12 +50,10 @@
 #endif
 #endif
 
-void KeyDerivation::setLogKDRate(const int8_t log_rate)
+void KeyDerivation::setRole(const role_t role)
 {
   WritersLock lock(mutex_);
-  ld_kdr_ = log_rate;
-  if(ld_kdr_ > (int8_t)(sizeof(seq_nr_t) * 8))
-    ld_kdr_ = sizeof(seq_nr_t) * 8;
+  role_ = role;
 }
 
 #ifndef NO_CRYPT
@@ -120,6 +118,47 @@ void KeyDerivation::calcMasterSalt(std::string passphrase, u_int16_t length)
 #endif
 #endif
 
+satp_prf_label_t KeyDerivation::convertLabel(kd_dir_t dir, satp_prf_label_t label)
+{
+  switch(label) {
+  case LABEL_ENC: {
+    if(dir == KD_OUTBOUND) {
+      if(role_ == ROLE_LEFT) return LABEL_LEFT_ENC;
+      if(role_ == ROLE_RIGHT) return LABEL_RIGHT_ENC;
+    }
+    else {
+      if(role_ == ROLE_LEFT) return LABEL_RIGHT_ENC;
+      if(role_ == ROLE_RIGHT) return LABEL_LEFT_ENC;
+    }
+    break;
+  }
+  case LABEL_SALT: {
+    if(dir == KD_OUTBOUND) {
+      if(role_ == ROLE_LEFT) return LABEL_LEFT_SALT;
+      if(role_ == ROLE_RIGHT) return LABEL_RIGHT_SALT;
+    }
+    else {
+      if(role_ == ROLE_LEFT) return LABEL_RIGHT_SALT;
+      if(role_ == ROLE_RIGHT) return LABEL_LEFT_SALT;
+    }
+    break;
+  }
+  case LABEL_AUTH: {
+    if(dir == KD_OUTBOUND) {
+      if(role_ == ROLE_LEFT) return LABEL_LEFT_AUTH;
+      if(role_ == ROLE_RIGHT) return LABEL_RIGHT_AUTH;
+    }
+    else {
+      if(role_ == ROLE_LEFT) return LABEL_RIGHT_AUTH;
+      if(role_ == ROLE_RIGHT) return LABEL_LEFT_AUTH;
+    }
+    break;
+  }
+  }
+
+  return label;
+}
+
 //****** NullKeyDerivation ******
 
 bool NullKeyDerivation::generate(kd_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr, Buffer& key)
@@ -176,7 +215,7 @@ AesIcmKeyDerivation::~AesIcmKeyDerivation()
 void AesIcmKeyDerivation::init(Buffer key, Buffer salt, std::string passphrase)
 {
   WritersLock lock(mutex_);
-  
+
   is_initialized_ = false;
 #ifndef NO_PASSPHRASE
   if(passphrase != "" && !key.getLength())
@@ -257,17 +296,8 @@ std::string AesIcmKeyDerivation::printType()
   return sstr.str();
 }
 
-bool AesIcmKeyDerivation::calcCtr(kd_dir_t dir, seq_nr_t* r, satp_prf_label_t label, seq_nr_t seq_nr)
+bool AesIcmKeyDerivation::calcCtr(kd_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr)
 {
-  *r = 0;
-  if(ld_kdr_ >= 0)
-    *r = seq_nr >> ld_kdr_;
-
-  if(key_store_[dir][label].key_.getLength() && key_store_[dir][label].r_ == *r) {
-    if(!(*r) || (seq_nr % (*r)))
-      return false;
-  }
-
   if(master_salt_.getLength() != SALT_LENGTH) {
     cLog.msg(Log::PRIO_ERROR) << "KeyDerivation::calcCtr: salt lengths don't match";
     return false;
@@ -276,11 +306,11 @@ bool AesIcmKeyDerivation::calcCtr(kd_dir_t dir, seq_nr_t* r, satp_prf_label_t la
   ctr_[dir].salt_.zero_ = 0;
   if(anytun02_compat_) {
     ctr_[dir].params_compat_.label_ ^= label;
-    ctr_[dir].params_compat_.r_ ^= SEQ_NR_T_HTON(*r);
+    ctr_[dir].params_compat_.seq_ ^= SEQ_NR_T_HTON(seq_nr);
   }
   else {
-    ctr_[dir].params_.label_ ^= label;
-    ctr_[dir].params_.r_ ^= SEQ_NR_T_HTON(*r);
+    ctr_[dir].params_.label_ ^= SATP_PRF_LABEL_T_HTON(convertLabel(dir, label));
+    ctr_[dir].params_.seq_ ^= SEQ_NR_T_HTON(seq_nr);
   }
 
   return true;
@@ -293,20 +323,10 @@ bool AesIcmKeyDerivation::generate(kd_dir_t dir, satp_prf_label_t label, seq_nr_
   if(!is_initialized_)
     return false;
 
-  seq_nr_t r;
-  calcCtr(dir, &r, label, seq_nr);
-  bool result = calcCtr(dir, &r, label, seq_nr);
-  if(!result) {
-    u_int32_t len = key.getLength();
-    if(len > key_store_[dir][label].key_.getLength()) {
-      cLog.msg(Log::PRIO_WARNING) << "KeyDerivation::generate: stored (old) key for label " << label << " is too short, filling with zeros";
-      std::memset(key.getBuf(), 0, len);
-      len = key_store_[dir][label].key_.getLength();
-    }
-    std::memcpy(key.getBuf(), key_store_[dir][label].key_.getBuf(), len);
+  if(!calcCtr(dir, label, seq_nr)) {
     return false;
   }
-  
+ 
 #ifndef USE_SSL_CRYPTO
   gcry_error_t err = gcry_cipher_reset(handle_[dir]);
   if(err) {
@@ -324,7 +344,6 @@ bool AesIcmKeyDerivation::generate(kd_dir_t dir, satp_prf_label_t label, seq_nr_
   if(err) {
     cLog.msg(Log::PRIO_ERROR) << "KeyDerivation::generate: Failed to generate cipher bitstream: " << AnytunGpgError(err);
   }
-  return true;
 #else
   if(CTR_LENGTH != AES_BLOCK_SIZE) {
     cLog.msg(Log::PRIO_ERROR) << "AesIcmCipher: Failed to set cipher CTR: size don't fits";
@@ -336,16 +355,6 @@ bool AesIcmKeyDerivation::generate(kd_dir_t dir, satp_prf_label_t label, seq_nr_
   AES_ctr128_encrypt(key.getBuf(), key.getBuf(), key.getLength(), &aes_key_[dir], ctr_[dir].buf_, ecount_buf_[dir], &num);
 #endif
   
-  if(!ld_kdr_)
-    return true;
-
-  if(key_store_[dir][label].key_.getLength() < key.getLength()) {
-    key_store_[dir][label].key_.setLength(key.getLength());
-  }
-
-  std::memcpy(key_store_[dir][label].key_.getBuf(), key.getBuf(), key.getLength());
-  key_store_[dir][label].r_ = r;
-
   return true;
 }
 #endif
diff --git a/src/keyDerivation.h b/src/keyDerivation.h
index 8318609..748a9a9 100644
--- a/src/keyDerivation.h
+++ b/src/keyDerivation.h
@@ -36,6 +36,7 @@
 #include "buffer.h"
 #include "threadUtils.hpp"
 #include "syncBuffer.h"
+#include "options.h"
 
 #ifndef NO_CRYPT
 #ifndef USE_SSL_CRYPTO
@@ -47,39 +48,37 @@
 #include <boost/archive/text_oarchive.hpp>
 #include <boost/archive/text_iarchive.hpp>
 
-#define KD_LABEL_COUNT 3
-typedef enum {
-  LABEL_SATP_ENCRYPTION  = 0x00,
-  LABEL_SATP_MSG_AUTH    = 0x01,
-  LABEL_SATP_SALT        = 0x02,
-} satp_prf_label_t;
+#define LABEL_ENC 0
+#define LABEL_AUTH 1
+#define LABEL_SALT 2
 
-typedef enum {
-  KD_INBOUND = 0,
-  KD_OUTBOUND = 1
-} kd_dir_t;
+#define LABEL_LEFT_ENC 0xDEADBEEF
+#define LABEL_RIGHT_ENC 0xDEAE0010
+#define LABEL_LEFT_SALT 0xDF10416F
+#define LABEL_RIGHT_SALT 0xDF13FF90
+#define LABEL_LEFT_AUTH 0xE0000683
+#define LABEL_RIGHT_AUTH 0xE001B97C
 
-typedef struct {
-  Buffer key_;
-  seq_nr_t r_;
-} key_store_t;
+typedef enum { KD_INBOUND, KD_OUTBOUND } kd_dir_t;
 
 class KeyDerivation
 {
 public:
-  KeyDerivation() : is_initialized_(false), ld_kdr_(0), anytun02_compat_(false), key_length_(0), master_salt_(0), master_key_(0) {};
-  KeyDerivation(bool a) : is_initialized_(false), ld_kdr_(0), anytun02_compat_(a), key_length_(0), master_salt_(0), master_key_(0) {};
-  KeyDerivation(u_int16_t key_length) : is_initialized_(false), ld_kdr_(0), anytun02_compat_(false), key_length_(key_length), master_salt_(0), master_key_(0) {};
-  KeyDerivation(bool a, u_int16_t key_length) : is_initialized_(false), ld_kdr_(0), anytun02_compat_(a), key_length_(key_length), master_salt_(0), master_key_(0) {};
+  KeyDerivation() : is_initialized_(false), role_(ROLE_LEFT), anytun02_compat_(false), key_length_(0), master_salt_(0), master_key_(0) {};
+  KeyDerivation(bool a) : is_initialized_(false), role_(ROLE_LEFT), anytun02_compat_(a), key_length_(0), master_salt_(0), master_key_(0) {};
+  KeyDerivation(u_int16_t key_length) : is_initialized_(false), role_(ROLE_LEFT), anytun02_compat_(false), key_length_(key_length), master_salt_(0), master_key_(0) {};
+  KeyDerivation(bool a, u_int16_t key_length) : is_initialized_(false), role_(ROLE_LEFT), anytun02_compat_(a), key_length_(key_length), master_salt_(0), master_key_(0) {};
   virtual ~KeyDerivation() {};
 
-  void setLogKDRate(const int8_t ld_rate);
+  void setRole(const role_t role);
 
   virtual void init(Buffer key, Buffer salt, std::string passphrase = "") = 0;
   virtual bool generate(kd_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr, Buffer& key) = 0;
 
   virtual std::string printType() { return "GenericKeyDerivation"; };
 
+  satp_prf_label_t convertLabel(kd_dir_t dir, satp_prf_label_t label);  
+
 protected:
   virtual void updateMasterKey() = 0;
   
@@ -94,7 +93,7 @@ protected:
 	void serialize(Archive & ar, const unsigned int version)
 	{
  		WritersLock lock(mutex_);
-    ar & ld_kdr_;
+    ar & role_;
     ar & key_length_;
     ar & master_salt_;
     ar & master_key_;
@@ -102,7 +101,7 @@ protected:
 	}
 
   bool is_initialized_;
-  int8_t ld_kdr_;             // ld(key_derivation_rate)
+  role_t role_;
   bool anytun02_compat_;
   u_int16_t key_length_;
   SyncBuffer master_salt_;
@@ -166,7 +165,7 @@ public:
 private:
   void updateMasterKey();
 
-  bool calcCtr(kd_dir_t dir, seq_nr_t* r, satp_prf_label_t label, seq_nr_t seq_nr);
+  bool calcCtr(kd_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr);
 
 	friend class boost::serialization::access;
 	template<class Archive>
@@ -182,8 +181,6 @@ private:
   u_int8_t ecount_buf_[2][AES_BLOCK_SIZE];
 #endif
 
-  key_store_t key_store_[2][KD_LABEL_COUNT];
-
 #ifdef _MSC_VER
   #pragma pack(push, 1)
 #endif  
@@ -194,16 +191,16 @@ private:
       u_int16_t zero_;
     } salt_;
 	struct ATTR_PACKED {
-      u_int8_t fill_[SALT_LENGTH - sizeof(u_int8_t) - sizeof(seq_nr_t)];
-      u_int8_t label_;
-      seq_nr_t r_;
+      u_int8_t fill_[SALT_LENGTH - sizeof(satp_prf_label_t) - sizeof(seq_nr_t)];
+      satp_prf_label_t label_;
+      seq_nr_t seq_;
       u_int16_t zero_;
     } params_;
     struct ATTR_PACKED {
       u_int8_t fill_[SALT_LENGTH - sizeof(u_int8_t) - 2*sizeof(u_int8_t) - sizeof(seq_nr_t)];
       u_int8_t label_;
-      u_int8_t r_fill_[2];
-      seq_nr_t r_;
+      u_int8_t seq_fill_[2];
+      seq_nr_t seq_;
       u_int16_t zero_;
     } params_compat_;
   } ctr_[2];
diff --git a/src/man/anytun-config.8.txt b/src/man/anytun-config.8.txt
index 5c0c7a1..8eb2839 100644
--- a/src/man/anytun-config.8.txt
+++ b/src/man/anytun-config.8.txt
@@ -19,7 +19,7 @@ SYNOPSIS
 [ *-m|--mux* <mux-id> ]
 [ *-w|--window-size* <window size> ]
 [ *-k|--kd-prf* <kd-prf type> ]
-[ *-O|--anytun02-compat* ]
+[ *-e|--role <role>* ]
 [ *-E|--passphrase* <pass phrase> ]
 [ *-K|--key* <master key> ]
 [ *-A|--salt* <master salt> ]
@@ -128,11 +128,15 @@ Possible values:
 * *aes-ctr-192* - AES in counter mode with 192 Bits
 * *aes-ctr-256* - AES in counter mode with 256 Bits
 
--O|--anytun02-compat
-~~~~~~~~~~~~~~~~~~~~
+-e|--role <role>
+~~~~~~~~~~~~~~~~
 
-Enable compatibility mode with version of anytun 0.2.x and prior. 
-This is for backwards compaitbility to old internet draft of satp.
+SATP uses different session keys for inbound and outbound traffic. The
+role parameter is used to determine which keys to use for outbound or
+inbound packets. On both sides of a vpn connection different roles have 
+to be used. Possible values are *left* and *right*. You may also use 
+*alice* or *server* as a replacement for *left* and *bob* or *client* as 
+a replacement for *right*. By default *left* is used.
 
 -E|--passphrase <pass phrase>
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -169,7 +173,7 @@ Add a client with Connection ID (Mux) 12 and add 2 Routes to this client
 
 ------------------------------------------------------------------------------------------------ 
 # anytun-config -w 0 -m 12 -K 0123456789ABCDEFFEDCBA9876543210 -A 0123456789ABCDDCBA9876543210 \
-                -R 192.0.2.0/24 -R 192.168.1.1/32 >> routingtable
+                -R 192.0.2.0/24 -R 192.168.1.1/32 -e server >> routingtable
 ------------------------------------------------------------------------------------------------ 
 
 BUGS
diff --git a/src/man/anytun.8.txt b/src/man/anytun.8.txt
index e393b70..05a650c 100644
--- a/src/man/anytun.8.txt
+++ b/src/man/anytun.8.txt
@@ -35,7 +35,7 @@ SYNOPSIS
 [ *-s|--sender-id* <sender id> ]
 [ *-w|--window-size* <window size> ]
 [ *-k|--kd-prf* <kd-prf type> ]
-[ *-O|--anytun02-compat* ]
+[ *-e|--role <role>* ]
 [ *-E|--passphrase* <pass phrase> ]
 [ *-K|--key* <master key> ]
 [ *-A|--salt* <master salt> ]
@@ -298,11 +298,15 @@ Possible values:
 * *aes-ctr-192* - AES in counter mode with 192 Bits
 * *aes-ctr-256* - AES in counter mode with 256 Bits
 
--O|--anytun02-compat
-~~~~~~~~~~~~~~~~~~~~
+-e|--role <role>
+~~~~~~~~~~~~~~~~
 
-Enable compatibility mode with version of anytun 0.2.x and prior. 
-This is for backwards compaitbility to old internet draft of satp.
+SATP uses different session keys for inbound and outbound traffic. The
+role parameter is used to determine which keys to use for outbound or
+inbound packets. On both sides of a vpn connection different roles have 
+to be used. Possible values are *left* and *right*. You may also use 
+*alice* or *server* as a replacement for *left* and *bob* or *client* as 
+a replacement for *right*. By default *left* is used.
 
 -E|--passphrase <pass phrase>
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -372,12 +376,12 @@ Host A:
 ^^^^^^^
 
 anytun -r hostb.example.com -t tun -n 192.168.123.1/30 -c aes-ctr-256 -k aes-ctr-256 \
-       -E have_a_very_safe_and_productive_day
+       -E have_a_very_safe_and_productive_day -e left
 
 Host B:
 ^^^^^^^
 anytun -r hosta.example.com -t tun -n 192.168.123.2/30 -c aes-ctr-256 -k aes-ctr-256 \
-       -E have_a_very_safe_and_productive_day
+       -E have_a_very_safe_and_productive_day -e right
 
 
 One unicast and one anycast tunnel endpoint:
@@ -386,31 +390,31 @@ One unicast and one anycast tunnel endpoint:
 Unicast tunnel endpoint:
 ^^^^^^^^^^^^^^^^^^^^^^^^
 
-anytun -r anycast.anytun.org -d anytun0 -t tun -n 192.0.2.2/30 -a null -c null -w 0
+anytun -r anycast.anytun.org -d anytun0 -t tun -n 192.0.2.2/30 -a null -c null -w 0 -e client
 
 Anycast tunnel endpoints:
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 On the host with unicast hostname unicast1.anycast.anytun.org and anycast 
 hostname anycast.anytun.org:
----------------------------------------------------------------------------------------
-# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1/30 -a null -c null -w 0 \
+-------------------------------------------------------------------------------------------------
+# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1/30 -a null -c null -w 0 -e server \
          -S 2342 -M unicast2.anycast.anytun.org:2342,unicast3.anycast.anytun.org:2342
----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------------------------
 
 On the host with unicast hostname unicast2.anycast.anytun.org and anycast
 hostname anycast.anytun.org:
----------------------------------------------------------------------------------------
-# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1/30 -a null -c null -w 0 \
+-------------------------------------------------------------------------------------------------
+# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1/30 -a null -c null -w 0 -e server \
          -S 2342 -M unicast1.anycast.anytun.org:2342,unicast3.anycast.anytun.org:2342
----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------------------------
 
 On the host with unicast hostname unicast3.anycast.anytun.org and anycast
 hostname anycast.anytun.org:
----------------------------------------------------------------------------------------
-# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1/30 -a null -c null -w 0 \
+-------------------------------------------------------------------------------------------------
+# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1/30 -a null -c null -w 0 -e server \
          -S 2342 -M unicast1.anycast.anytun.org:2342,unicast2.anycast.anytun.org:2342
----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------------------------
 
 For more sophisticated examples (like multiple unicast endpoints to one
 anycast tunnel endpoint) please consult the man page of anytun-config(8).
diff --git a/src/options.cpp b/src/options.cpp
index b3e37db..e58278a 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -187,7 +187,7 @@ Options::Options() : key_(u_int32_t(0)), salt_(u_int32_t(0))
   auth_algo_ = "null";
   kd_prf_ = "null";
 #endif
-  ld_kdr_ = 0;
+  role_ = ROLE_LEFT;
   anytun02_compat_ = false;
 }
 
@@ -327,7 +327,7 @@ bool Options::parse(int argc, char* argv[])
   progname_ = argv[0];
   argc--;
   bool ipv4_only = false, ipv6_only = false;
-  int32_t ld_kdr_tmp = ld_kdr_;
+  std::string role = "";
   for(int i=1; argc > 0; ++i)
   {
     std::string str(argv[i]);
@@ -397,7 +397,7 @@ bool Options::parse(int argc, char* argv[])
 
   #ifndef NO_CRYPT
     PARSE_SCALAR_PARAM("-k","--kd-prf", kd_prf_)
-//    PARSE_SIGNED_INT_PARAM("-l","--ld-kdr", ld_kdr_tmp)
+    PARSE_SCALAR_PARAM("-e","--role", role)
     PARSE_BOOL_PARAM("-O","--anytun02-compat", anytun02_compat_)
   #ifndef NO_PASSPHRASE
     PARSE_PHRASE_PARAM_SEC("-E","--passphrase", passphrase_)
@@ -425,7 +425,14 @@ bool Options::parse(int argc, char* argv[])
   if(ipv6_only)
     resolv_addr_type_ = IPV6_ONLY;
 
-  ld_kdr_ = static_cast<int8_t>(ld_kdr_tmp);
+  if(role != "") {
+    if(role == "alice" || role == "server" || role == "left")
+      role_ = ROLE_LEFT;
+    else if(role == "bob" || role == "client" || role == "right")
+      role_ = ROLE_RIGHT;
+    else
+      throw syntax_error("unknown role name: " + role, -1); 
+  }
 
   return true;
 }
@@ -520,7 +527,7 @@ void Options::printUsage()
 
  #ifndef NO_CRYPT
   std::cout << "   [-k|--kd-prf] <kd-prf type>         key derivation pseudo random function" << std::endl;
-//  std::cout << "   [-l|--ld-kdr] <ld-kdr>              log2 of key derivation rate" << std::endl;
+  std::cout << "   [-e|--role] <role>                  left (alice) or right (bob)" << std::endl;
   std::cout << "   [-O|--anytun02-compat]              enable compatiblity mode for anytun 0.2.x and prior" << std::endl;
  #ifndef NO_PASSPHRASE
   std::cout << "   [-E|--passphrase] <pass phrase>     a passprhase to generate master key and salt from" << std::endl;
@@ -596,7 +603,12 @@ void Options::printOptions()
   std::cout << "cipher = '" << cipher_ << "'" << std::endl;
   std::cout << "auth_algo = '" << auth_algo_ << "'" << std::endl;
   std::cout << "kd_prf = '" << kd_prf_ << "'" << std::endl;
-  std::cout << "ld_kdr = " << static_cast<int32_t>(ld_kdr_) << std::endl;
+  std::cout << "role = ";
+  switch(role_) {
+  case ROLE_LEFT: std::cout << "left" << std::endl; break;
+  case ROLE_RIGHT: std::cout << "right" << std::endl; break;
+  default: std::cout << "??" << std::endl; break;
+  }
   std::cout << "anytun02_compat = " << anytun02_compat_ << std::endl;
   std::cout << "passphrase = '" << passphrase_ << "'" << std::endl;
   std::cout << "key = " << key_.getHexDumpOneLine() << std::endl;
@@ -972,16 +984,16 @@ Options& Options::setKdPrf(std::string k)
   return *this;
 }
 
-int8_t Options::getLdKdr()
+role_t Options::getRole()
 {
   ReadersLock lock(mutex);
-  return ld_kdr_;
+  return role_;
 }
 
-Options& Options::setLdKdr(int8_t l)
+Options& Options::setRole(role_t r)
 {
   WritersLock lock(mutex);
-  ld_kdr_ = l;
+  role_ = r;
   return *this;
 }
 
diff --git a/src/options.h b/src/options.h
index 122f3f0..480d1c7 100644
--- a/src/options.h
+++ b/src/options.h
@@ -77,6 +77,8 @@ std::istream& operator>>(std::istream& stream, OptionNetwork& network);
 
 typedef std::list<std::string> StringList;
 
+typedef enum { ROLE_LEFT, ROLE_RIGHT } role_t;
+
 class Options
 {
 public:
@@ -149,8 +151,8 @@ public:
   Options& setAuthAlgo(std::string a);
   std::string getKdPrf();
   Options& setKdPrf(std::string k);
-  int8_t getLdKdr();
-  Options& setLdKdr(int8_t l);
+  role_t getRole();
+  Options& setRole(role_t r);
   bool getAnytun02Compat();
   Options& setAnytun02Compat(bool a);
   std::string getPassphrase();
@@ -211,7 +213,7 @@ private:
   std::string cipher_;
   std::string auth_algo_;
   std::string kd_prf_;
-  int8_t ld_kdr_;
+  role_t role_;
   bool anytun02_compat_;
   std::string passphrase_;
   Buffer key_;