Added XOR support the the HSS.

srsepc/epc.conf.example

@@ -14,7 +14,7 @@
 #
 #####################################################################
 [mme]
-mme_code = 0x19
+mme_code = 0x1a
 mme_group = 0x0001
 tac = 0x0001
 mcc = 001
@@ -28,6 +28,7 @@ mme_bind_addr = 127.0.0.0/24
 #
 #####################################################################
 [hss]
+auth_algo = xor
 db_file = user_db.csv
 
 

srsepc/hdr/hss/hss.h

@@ -39,10 +39,12 @@
 #include "srslte/common/log_filter.h"
 #include "srslte/common/buffer_pool.h"
 #include <fstream>
+#include <map>
 
 namespace srsepc{
 
 typedef struct{
+  std::string auth_algo;
   std::string db_file;
 }hss_args_t;
 
@@ -54,7 +56,10 @@ typedef struct{
     uint8_t amf[2];
 }hss_ue_ctx_t;
 
-
+enum hss_auth_algo {
+  HSS_ALGO_XOR,
+  HSS_ALGO_MILENAGE
+};
 
 class hss
 {
@@ -62,12 +67,15 @@ public:
   static hss* get_instance(void);
   static void cleanup(void);
   int init(hss_args_t *hss_args, srslte::log_filter* hss_log);
+  bool set_auth_algo(std::string auth_algo);
   bool read_db_file(std::string db_file);
 
   void get_sqn(uint8_t sqn[6]);
   void gen_rand(uint8_t rand_[16]);
   bool get_k_amf_op(uint64_t imsi, uint8_t *k, uint8_t *amf, uint8_t *op);
+  bool gen_auth_info_answer(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres);
   bool gen_auth_info_answer_milenage(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres);
+  bool gen_auth_info_answer_xor(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres);
 
   std::vector<std::string> split_string(const std::string &str, char delimiter);
   void get_uint_vec_from_hex_str(const std::string &key_str, uint8_t *key, uint len);
@@ -84,6 +92,8 @@ private:
 
   std::map<uint64_t,hss_ue_ctx_t*> m_imsi_to_ue_ctx;
 
+  enum hss_auth_algo m_auth_algo;
+
   /*Logs*/
   srslte::log_filter       *m_hss_log;
  

srsepc/src/hss/hss.cc

@@ -39,7 +39,8 @@ hss*          hss::m_instance = NULL;
 boost::mutex  hss_instance_mutex;
 
 hss::hss()
- :m_sqn(0x112233445566)
+// :m_sqn(0x112233445566)
+  :m_sqn(0)
 {
   m_pool = srslte::byte_buffer_pool::get_instance();
   return;
@@ -80,14 +81,42 @@ hss::init(hss_args_t *hss_args, srslte::log_filter *hss_log)
   srand(time(NULL));
   /*Init loggers*/
   m_hss_log = hss_log;
-  m_hss_log->info("HSS Initialized\n");
-  m_hss_log->console("HSS Initialized\n");
 
+  /*Set authentication algorithm*/
+  if(set_auth_algo(hss_args->auth_algo) == false)
+  {
+    return -1;
+  }
   /*Read user information from DB*/
-  read_db_file(hss_args->db_file);
+  if(read_db_file(hss_args->db_file) == false)
+  {
+    return -1;
+  }
+
+  m_hss_log->info("HSS Initialized. DB file %s, authentication algorithm %s\n", hss_args->db_file.c_str(),hss_args->auth_algo.c_str());
+  m_hss_log->console("HSS Initialized\n");
   return 0;
 }
 
+bool
+hss::set_auth_algo(std::string auth_algo)
+{
+  if(auth_algo != "xor" && auth_algo != "milenage" )
+  {
+    m_hss_log->error("Unrecognized authentication algorithm. auth_algo = %s\n", auth_algo.c_str());
+    return false;
+  }
+  if(auth_algo == "xor")
+  {
+    m_auth_algo = HSS_ALGO_XOR;
+  }
+  else
+  {
+    m_auth_algo = HSS_ALGO_MILENAGE;
+  }
+  return true;
+}
+
 bool
 hss::read_db_file(std::string db_filename)
 {
@@ -128,6 +157,23 @@ hss::read_db_file(std::string db_filename)
   return true;
 }
 
+bool
+hss::gen_auth_info_answer(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres)
+{
+  bool ret = false;
+  switch (m_auth_algo)
+  {
+  case HSS_ALGO_XOR:
+    ret = gen_auth_info_answer_xor(imsi, k_asme, autn, rand, xres);
+    break;
+  case HSS_ALGO_MILENAGE:
+    ret = gen_auth_info_answer_milenage(imsi, k_asme, autn, rand, xres);
+    break;
+  }
+  return ret;
+
+}
+
 bool
 hss::gen_auth_info_answer_milenage(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres)
 {
@@ -196,6 +242,106 @@ hss::gen_auth_info_answer_milenage(uint64_t imsi, uint8_t *k_asme, uint8_t *autn
   return true;
 }
 
+bool
+hss::gen_auth_info_answer_xor(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres)
+{
+  uint8_t k[16];
+  uint8_t amf[2];
+  uint8_t op[16];
+  uint8_t sqn[6];
+
+  uint8_t  xdout[16];
+  uint8_t  cdout[8];
+
+  uint8_t     ck[16];
+  uint8_t     ik[16];
+  uint8_t     ak[6];
+  uint8_t     mac[8];
+
+  uint16_t  mcc=61441; //001
+  uint16_t  mnc=65281; //01
+
+  int i = 0;
+
+  if(!get_k_amf_op(imsi,k,amf,op))
+  {
+    return false;
+  }
+  gen_rand(rand);
+  get_sqn(sqn);
+
+  // Use RAND and K to compute RES, CK, IK and AK
+  for(i=0; i<16; i++) {
+    xdout[i] = k[i]^rand[i];
+  }
+
+  for(i=0; i<16; i++) {
+    xres[i]  = xdout[i];
+    ck[i]   = xdout[(i+1)%16];
+    ik[i]   = xdout[(i+2)%16];
+  }
+  for(i=0; i<6; i++) {
+    ak[i] = xdout[i+3];
+  }
+
+  // Generate cdout
+  for(i=0; i<6; i++) {
+    cdout[i] = sqn[i];
+  }
+  for(i=0; i<2; i++) {
+    cdout[6+i] = amf[i];
+  }
+
+  // Generate MAC
+  for(i=0;i<8;i++) {
+    mac[i] = xdout[i] ^ cdout[i];
+  }
+
+  //Generate AUTN (autn = sqn ^ ak |+| amf |+| mac)
+  for(int i=0;i<6;i++ )
+  {
+      autn[i] = sqn[i]^ak[i];
+  }
+  for(int i=0;i<2;i++)
+  {
+      autn[6+i]=amf[i];
+  }
+  for(int i=0;i<8;i++)
+  {
+      autn[8+i]=mac[i];
+  }
+
+  // Generate K_asme
+  security_generate_k_asme( ck,
+                            ik,
+                            ak,
+                            sqn,
+                            mcc,
+                            mnc,
+                            k_asme);
+
+  //Generate AUTN (autn = sqn ^ ak |+| amf |+| mac)
+  for(int i=0;i<6;i++ )
+  {
+    autn[i] = sqn[i]^ak[i];
+  }
+  for(int i=0;i<2;i++)
+  {
+    autn[6+i]=amf[i];
+  }
+  for(int i=0;i<8;i++)
+  {
+    autn[8+i]=mac[i];
+  }
+
+  m_hss_log->debug_hex(sqn, 6, "User SQN : ");
+  m_hss_log->debug_hex(autn, 8, "User AUTN: ");
+  m_hss_log->debug_hex(xres, 8, "User XRES: ");
+
+  return true;
+}
+
+
 bool
 hss::get_k_amf_op(uint64_t imsi, uint8_t *k, uint8_t *amf, uint8_t *op )
 {

srsepc/src/main.cc

@@ -74,6 +74,7 @@ parse_args(all_args_t *args, int argc, char* argv[]) {
   string spgw_bind_addr;
   string sgi_if_addr;
   string hss_db_file;
+  string hss_auth_algo;
 
   // Command line only options
   bpo::options_description general("General options");
@@ -94,6 +95,7 @@ parse_args(all_args_t *args, int argc, char* argv[]) {
     ("mme.mnc",             bpo::value<string>(&mnc)->default_value("01"),                           "Mobile Network Code")
     ("mme.mme_bind_addr",   bpo::value<string>(&mme_bind_addr)->default_value("127.0.0.1"),"IP address of MME for S1 connnection")
     ("hss.db_file",         bpo::value<string>(&hss_db_file)->default_value("ue_db.csv"),".csv file that stores UE's keys")
+    ("hss.auth_algo",       bpo::value<string>(&hss_auth_algo)->default_value("milenage"),"HSS uthentication algorithm.")
     ("spgw.gtpu_bind_addr", bpo::value<string>(&spgw_bind_addr)->default_value("127.0.0.1"),"IP address of SP-GW for the S1-U connection")
     ("spgw.sgi_if_addr",    bpo::value<string>(&sgi_if_addr)->default_value("176.16.0.1"),"IP address of TUN interface for the SGi connection")
     ;
@@ -166,11 +168,12 @@ parse_args(all_args_t *args, int argc, char* argv[]) {
   if(!srslte::string_to_mnc(mnc, &args->mme_args.s1ap_args.mnc)) {
     cout << "Error parsing enb.mnc:" << mnc << " - must be a 2 or 3-digit string." << endl;
   }
-  
+ 
   args->mme_args.s1ap_args.mme_bind_addr = mme_bind_addr;
   args->spgw_args.gtpu_bind_addr = spgw_bind_addr;
   args->spgw_args.sgi_if_addr = sgi_if_addr;
   args->hss_args.db_file = hss_db_file;
+  args->hss_args.auth_algo = hss_auth_algo;
   return;
 }
 

srsepc/src/mme/s1ap.cc

@@ -378,7 +378,7 @@ s1ap::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *ini
   memcpy(&ue_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
 
   //Get Authentication Vectors from HSS
-  if(!m_hss->gen_auth_info_answer_milenage(imsi, ue_ctx.security_ctxt.k_asme, autn, rand, ue_ctx.security_ctxt.xres))
+  if(!m_hss->gen_auth_info_answer(imsi, ue_ctx.security_ctxt.k_asme, autn, rand, ue_ctx.security_ctxt.xres))
   {
     m_s1ap_log->console("User not found. IMSI %015lu\n",imsi);
     m_s1ap_log->info("User not found. IMSI %015lu\n",imsi);
@@ -468,7 +468,7 @@ s1ap::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRANSPORT_STRUCT
        return true; //no need for reply. FIXME this should be better structured...
     break;
     default:
-      m_s1ap_log->info("Unhandled NAS message");
+      m_s1ap_log->info("Unhandled NAS message 0x%x\n", msg_type );
       return false; //FIXME (nas_msg deallocate needs to be called)
   }
 

srsepc/src/mme/s1ap_nas_transport.cc

@@ -82,7 +82,7 @@ s1ap_nas_transport::unpack_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
     return false;
   }
 
-  if(pdn_con_req->pdn_type != LIBLTE_MME_PDN_TYPE_IPV4)
+  if(pdn_con_req->pdn_type == LIBLTE_MME_PDN_TYPE_IPV6)
   {
     m_s1ap_log->error("PDN Connectivity Request: Only IPv4 connectivity supported.\n");
     return false;
@@ -331,59 +331,59 @@ s1ap_nas_transport::log_unhandled_attach_request_ies(const LIBLTE_MME_ATTACH_REQ
 {
   if(attach_req->old_p_tmsi_signature_present)
   {
-    m_s1ap_log->warning("NAS attach request: Old P-TMSI signature present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Old P-TMSI signature present, but not handled.\n");
   }
   if(attach_req->additional_guti_present)
   {
-    m_s1ap_log->warning("NAS attach request: Aditional GUTI present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Aditional GUTI present, but not handled.\n");
   }
   if(attach_req->last_visited_registered_tai_present)
   {
-    m_s1ap_log->warning("NAS attach request: Last visited registered TAI present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Last visited registered TAI present, but not handled.\n");
   }
   if(attach_req->drx_param_present)
   {
-    m_s1ap_log->warning("NAS attach request: DRX Param present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: DRX Param present, but not handled.\n");
   }
   if(attach_req->ms_network_cap_present)
   {
-    m_s1ap_log->warning("NAS attach request: MS network cap present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: MS network cap present, but not handled.\n");
   }
   if(attach_req->old_lai_present)
   {
-    m_s1ap_log->warning("NAS attach request: Old LAI present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Old LAI present, but not handled.\n");
   }
   if(attach_req->tmsi_status_present)
   {
-    m_s1ap_log->warning("NAS attach request: TSMI status present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: TSMI status present, but not handled.\n");
   }
   if(attach_req->ms_cm2_present)
   {
-    m_s1ap_log->warning("NAS attach request: MS CM2 present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: MS CM2 present, but not handled.\n");
   }
   if(attach_req->ms_cm3_present)
   {
-    m_s1ap_log->warning("NAS attach request: MS CM3 present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: MS CM3 present, but not handled.\n");
   }
   if(attach_req->supported_codecs_present)
   {
-    m_s1ap_log->warning("NAS attach request: Supported CODECs present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Supported CODECs present, but not handled.\n");
   }
   if(attach_req->additional_update_type_present)
   {
-    m_s1ap_log->warning("NAS attach request: Additional Update Type present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Additional Update Type present, but not handled.\n");
   }
   if(attach_req->voice_domain_pref_and_ue_usage_setting_present)
   {
-    m_s1ap_log->warning("NAS attach request: Voice domain preference and UE usage setting  present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Voice domain preference and UE usage setting  present, but not handled.\n");
   }
   if(attach_req->device_properties_present)
   {
-    m_s1ap_log->warning("NAS attach request: Device properties present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Device properties present, but not handled.\n");
   }
   if(attach_req->old_guti_type_present)
   {
-    m_s1ap_log->warning("NAS attach request: Old GUTI type present, but not handled.");
+    m_s1ap_log->warning("NAS attach request: Old GUTI type present, but not handled.\n");
   }
   return;
 }
@@ -394,19 +394,19 @@ s1ap_nas_transport::log_unhandled_pdn_con_request_ies(const LIBLTE_MME_PDN_CONNE
   //Handle the optional flags
   if(pdn_con_req->esm_info_transfer_flag_present)
   {
-    m_s1ap_log->warning("PDN Connectivity request: ESM info transfer flag properties present, but not handled.");
+    m_s1ap_log->warning("PDN Connectivity request: ESM info transfer flag properties present, but not handled.\n");
   }
   if(pdn_con_req->apn_present)
   {
-    m_s1ap_log->warning("PDN Connectivity request: APN present, but not handled.");
+    m_s1ap_log->warning("PDN Connectivity request: APN present, but not handled.\n");
   }
   if(pdn_con_req->protocol_cnfg_opts_present)
   {
-    m_s1ap_log->warning("PDN Connectivity request: Protocol Cnfg options present, but not handled.");
+    m_s1ap_log->warning("PDN Connectivity request: Protocol Cnfg options present, but not handled.\n");
   }
   if(pdn_con_req->device_properties_present)
   {
-    m_s1ap_log->warning("PDN Connectivity request: Device properties present, but not handled.");
+    m_s1ap_log->warning("PDN Connectivity request: Device properties present, but not handled.\n");
   }
 }
 
@@ -415,37 +415,37 @@ void
 s1ap_nas_transport::log_unhandled_initial_ue_message_ies(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *init_ue)
 {
   if(init_ue->S_TMSI_present){
-    m_s1ap_log->warning("S-TMSI present, but not handled.");
+    m_s1ap_log->warning("S-TMSI present, but not handled.\n");
   }
   if(init_ue->CSG_Id_present){
-    m_s1ap_log->warning("S-TMSI present, but not handled.");
+    m_s1ap_log->warning("S-TMSI present, but not handled.\n");
   }
   if(init_ue->GUMMEI_ID_present){
-    m_s1ap_log->warning("GUMMEI ID present, but not handled.");
+    m_s1ap_log->warning("GUMMEI ID present, but not handled.\n");
   }
   if(init_ue->CellAccessMode_present){
-    m_s1ap_log->warning("Cell Access Mode present, but not handled.");
+    m_s1ap_log->warning("Cell Access Mode present, but not handled.\n");
   } 
   if(init_ue->GW_TransportLayerAddress_present){
-    m_s1ap_log->warning("GW Transport Layer present, but not handled.");
+    m_s1ap_log->warning("GW Transport Layer present, but not handled.\n");
   }
   if(init_ue->GW_TransportLayerAddress_present){
-    m_s1ap_log->warning("GW Transport Layer present, but not handled.");
+    m_s1ap_log->warning("GW Transport Layer present, but not handled.\n");
   }
   if(init_ue->RelayNode_Indicator_present){
-    m_s1ap_log->warning("Relay Node Indicator present, but not handled.");
+    m_s1ap_log->warning("Relay Node Indicator present, but not handled.\n");
   }
   if(init_ue->GUMMEIType_present){
-    m_s1ap_log->warning("GUMMEI Type present, but not handled.");
+    m_s1ap_log->warning("GUMMEI Type present, but not handled.\n");
   }
   if(init_ue->Tunnel_Information_for_BBF_present){
-    m_s1ap_log->warning("Tunnel Information for BBF present, but not handled.");
+    m_s1ap_log->warning("Tunnel Information for BBF present, but not handled.\n");
   }
   if(init_ue->SIPTO_L_GW_TransportLayerAddress_present){
-    m_s1ap_log->warning("SIPTO GW Transport Layer Address present, but not handled.");
+    m_s1ap_log->warning("SIPTO GW Transport Layer Address present, but not handled.\n");
   }
   if(init_ue->LHN_ID_present){
-    m_s1ap_log->warning("LHN Id present, but not handled.");
+    m_s1ap_log->warning("LHN Id present, but not handled.\n");
   }
   return;
 }

srsepc/user_db.csv

@@ -9,5 +9,5 @@
 # AMF:  Authentication management feild, stored in hexadecimal
 #
 # Note: Lines starting by '#' are ignored
-ue1,001010123456789,00112233445566778899aabbccddeeff,63BFA50EE6523365FF14C1F45F88737D,8000
+ue1,001010123456789,00112233445566778899aabbccddeeff,63BFA50EE6523365FF14C1F45F88737D,9001
 ue2,001010123456780,00112233445566778899aabbccddeeaa,63BFA50EE6523365FF14C1F45F88737D,2000