1 files changed, 1 insertions, 0 deletions

diff --git a/lib/basic_op.cc b/lib/basic_op.cc
index c247493..fa659ac 100644
--- a/lib/basic_op.cc
+++ b/lib/basic_op.cc
@@ -1,200 +1,201 @@
 #include <time.h>
 #include <cassert>
 #include <openssl/sha.h>
 #include <openssl/hmac.h>
 #include <opkele/data.h>
 #include <opkele/basic_op.h>
 #include <opkele/exception.h>
 #include <opkele/util.h>
+#include <opkele/util-internal.h>
 #include <opkele/uris.h>
 
 namespace opkele {
 
     void basic_OP::reset_vars() {
         assoc.reset();
         return_to.clear(); realm.clear();
         claimed_id.clear(); identity.clear();
         invalidate_handle.clear();
     }
 
     bool basic_OP::has_return_to() const {
         return !return_to.empty();
     }
     const string& basic_OP::get_return_to() const {
         if(return_to.empty())
             throw no_return_to(OPKELE_CP_ "No return_to URL provided with request");
         return return_to;
     }
 
     const string& basic_OP::get_realm() const {
         assert(!realm.empty());
         return realm;
     }
 
     bool basic_OP::has_identity() const {
         return !identity.empty();
     }
     const string& basic_OP::get_claimed_id() const {
         if(claimed_id.empty())
             throw non_identity(OPKELE_CP_ "attempting to retrieve claimed_id of non-identity related request");
         assert(!identity.empty());
         return claimed_id;
     }
     const string& basic_OP::get_identity() const {
         if(identity.empty())
             throw non_identity(OPKELE_CP_ "attempting to retrieve identity of non-identity related request");
         assert(!claimed_id.empty());
         return identity;
     }
 
     bool basic_OP::is_id_select() const {
         return identity==IDURI_SELECT20;
     }
 
     void basic_OP::select_identity(const string& c,const string& i) {
         claimed_id = c; identity = i;
     }
     void basic_OP::set_claimed_id(const string& c) {
         claimed_id = c;
     }
 
     basic_openid_message& basic_OP::associate(
             basic_openid_message& oum,
             const basic_openid_message& inm) try {
         assert(inm.get_field("mode")=="associate");
         util::dh_t dh;
         util::bignum_t c_pub;
         unsigned char key_digest[SHA256_DIGEST_LENGTH];
         size_t d_len = 0;
         string sts = inm.get_field("session_type");
         string ats = inm.get_field("assoc_type");
         if(sts=="DH-SHA1" || sts=="DH-SHA256") {
             if(!(dh = DH_new()))
                 throw exception_openssl(OPKELE_CP_ "failed to DH_new()");
             c_pub = util::base64_to_bignum(inm.get_field("dh_consumer_public"));
             try { dh->p = util::base64_to_bignum(inm.get_field("dh_modulus"));
             }catch(failed_lookup&) {
                 dh->p = util::dec_to_bignum(data::_default_p); }
             try { dh->g = util::base64_to_bignum(inm.get_field("dh_gen"));
             }catch(failed_lookup&) {
                 dh->g = util::dec_to_bignum(data::_default_g); }
             if(!DH_generate_key(dh))
                 throw exception_openssl(OPKELE_CP_ "failed to DH_generate_key()");
             vector<unsigned char> ck(DH_size(dh)+1);
             unsigned char *ckptr = &(ck.front())+1;
             int cklen = DH_compute_key(ckptr,c_pub,dh);
             if(cklen<0)
                 throw exception_openssl(OPKELE_CP_ "failed to DH_compute_key()");
             if(cklen && (*ckptr)&0x80) {
                 (*(--ckptr)) = 0; ++cklen; }
             if(sts=="DH-SHA1") {
                 SHA1(ckptr,cklen,key_digest); d_len = SHA_DIGEST_LENGTH;
             }else if(sts=="DH-SHA256") {
                 SHA256(ckptr,cklen,key_digest); d_len = SHA256_DIGEST_LENGTH;
             }else
                 throw internal_error(OPKELE_CP_ "I thought I knew the session type");
         }else
             throw unsupported(OPKELE_CP_ "Unsupported session_type");
         assoc_t a;
         if(ats=="HMAC-SHA1")
             a = alloc_assoc(ats,SHA_DIGEST_LENGTH,false);
         else if(ats=="HMAC-SHA256")
             a = alloc_assoc(ats,SHA256_DIGEST_LENGTH,false);
         else
             throw unsupported(OPKELE_CP_ "Unsupported assoc_type");
         oum.reset_fields();
         oum.set_field("ns",OIURI_OPENID20);
         oum.set_field("assoc_type",a->assoc_type());
         oum.set_field("assoc_handle",a->handle());
         oum.set_field("expires_in",util::long_to_string(a->expires_in()));
         secret_t secret = a->secret();
         if(sts=="DH-SHA1" || sts=="DH-SHA256") {
             if(d_len != secret.size())
                 throw bad_input(OPKELE_CP_ "Association secret and session MAC are not of the same size");
             oum.set_field("session_type",sts);
             oum.set_field("dh_server_public",util::bignum_to_base64(dh->pub_key));
             string b64; secret.enxor_to_base64(key_digest,b64);
             oum.set_field("enc_mac_key",b64);
         }else /* TODO: support cleartext over encrypted connection */
             throw unsupported(OPKELE_CP_ "Unsupported session type");
         return oum;
     } catch(unsupported& u) {
         oum.reset_fields();
         oum.set_field("ns",OIURI_OPENID20);
         oum.set_field("error",u.what());
         oum.set_field("error_code","unsupported-type");
         oum.set_field("session_type","DH-SHA256");
         oum.set_field("assoc_type","HMAC-SHA256");
         return oum;
     }
 
     void basic_OP::checkid_(const basic_openid_message& inm,
             extension_t *ext) {
         reset_vars();
         string modestr = inm.get_field("mode");
         if(modestr=="checkid_setup")
             mode = mode_checkid_setup;
         else if(modestr=="checkid_immediate")
             mode = mode_checkid_immediate;
         else
             throw bad_input(OPKELE_CP_ "Invalid checkid_* mode");
         try {
             assoc = retrieve_assoc(invalidate_handle=inm.get_field("assoc_handle"));
             invalidate_handle.clear();
         }catch(failed_lookup&) { }
         try {
             openid2 = (inm.get_field("ns")==OIURI_OPENID20);
         }catch(failed_lookup&) { openid2 = false; }
         try {
             return_to = inm.get_field("return_to");
         }catch(failed_lookup&) { }
         if(openid2) {
             try {
                 realm = inm.get_field("realm");
             }catch(failed_lookup&) {
                 try {
                     realm = inm.get_field("trust_root");
                 }catch(failed_lookup&) {
                     if(return_to.empty())
                         throw bad_input(OPKELE_CP_
                                 "Both realm and return_to are unset");
                     realm = return_to;
                 }
             }
         }else{
             try {
                 realm = inm.get_field("trust_root");
             }catch(failed_lookup&) {
                 if(return_to.empty())
                     throw bad_input(OPKELE_CP_
                             "Both realm and return_to are unset");
                 realm = return_to;
             }
         }
         try {
             identity = inm.get_field("identity");
             try {
                 claimed_id = inm.get_field("claimed_id");
             }catch(failed_lookup&) {
                 if(openid2)
                     throw bad_input(OPKELE_CP_
                             "claimed_id and identity must be either both present or both absent");
                 claimed_id = identity;
             }
         }catch(failed_lookup&) {
             if(openid2 && inm.has_field("claimed_id"))
                 throw bad_input(OPKELE_CP_
                     "claimed_id and identity must be either both present or both absent");
         }
         verify_return_to();
         if(ext) ext->op_checkid_hook(inm);
     }
 
     basic_openid_message& basic_OP::id_res(basic_openid_message& om,
             extension_t *ext) {
         assert(!return_to.empty());
         assert(!is_id_select());
         if(!assoc) {
             assoc = alloc_assoc("HMAC-SHA256",SHA256_DIGEST_LENGTH,true);
         }
         time_t now = time(0);