Add code point for the SRP identifier extension and add a check for it

in the Client_Hello parser. Works, tested with GnuTLS command line
client.

3 files changed, 13 insertions, 0 deletions

diff --git a/src/ssl/hello.cpp b/src/ssl/hello.cpp
index 2c5a9d2ea..ae0d9607b 100644
--- a/src/ssl/hello.cpp
+++ b/src/ssl/hello.cpp
@@ -190,6 +190,14 @@ void Client_Hello::deserialize(const MemoryRegion<byte>& buf)
                   }
                }
             }
+         else if(extension_code == TLSEXT_SRP_IDENTIFIER)
+            {
+            std::vector<byte> name = reader.get_range_vector<byte>(1, 1, 255);
+
+            requested_srp_id.assign(
+               reinterpret_cast<char*>(&name[0]),
+               name.size());
+            }
          else
             {
             reader.discard_next(extension_size);
diff --git a/src/ssl/tls_magic.h b/src/ssl/tls_magic.h
index 0c2a610b1..00898738e 100644
--- a/src/ssl/tls_magic.h
+++ b/src/ssl/tls_magic.h
@@ -181,6 +181,8 @@ enum TLS_Handshake_Extension_Type {
    TLSEXT_USABLE_ELLIPTIC_CURVES = 10,
    TLSEXT_EC_POINT_FORMATS       = 11,
 
+   TLSEXT_SRP_IDENTIFIER         = 12,
+
    TLSEXT_CERTIFICATE_TYPES      = 9,
    TLSEXT_SESSION_TICKET         = 35
 };
diff --git a/src/ssl/tls_messages.h b/src/ssl/tls_messages.h
index 0b3553ac0..e7eaa56e1 100644
--- a/src/ssl/tls_messages.h
+++ b/src/ssl/tls_messages.h
@@ -51,6 +51,8 @@ class Client_Hello : public HandshakeMessage
 
       std::string hostname() const { return requested_hostname; }
 
+      std::string srp_identifier() const { return requested_srp_id; }
+
       bool offered_suite(u16bit) const;
 
       Client_Hello(RandomNumberGenerator& rng,
@@ -75,6 +77,7 @@ class Client_Hello : public HandshakeMessage
       std::vector<u16bit> suites;
       std::vector<byte> comp_algos;
       std::string requested_hostname;
+      std::string requested_srp_id;
    };
 
 /**