looks like yet another breakage by LJ

IIRC, previously, livejournal.com supplied empty op_endpoint URL. Now it
doesn't supply it at all. Dunno which breakage is better.

Signed-off-by: Michael Krelin <hacker@klever.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/basic_rp.cc b/lib/basic_rp.cc
index 8125aa7..9c7113b 100644
--- a/lib/basic_rp.cc
+++ b/lib/basic_rp.cc
@@ -93,234 +93,235 @@ namespace opkele {
         openid_message_t res;
         req.set_field("assoc_type","HMAC-SHA256");
         req.set_field("session_type","DH-SHA256");
         secret_t secret;
         int expires_in;
         try {
             direct_request(res,req,OP);
             dh_get_secret( secret, res,
                     "HMAC-SHA256", "DH-SHA256",
                     dh, SHA256_DIGEST_LENGTH, SHA256, SHA256_DIGEST_LENGTH );
             expires_in = util::string_to_long(res.get_field("expires_in"));
         }catch(exception&) {
             try {
                 req.set_field("assoc_type","HMAC-SHA1");
                 req.set_field("session_type","DH-SHA1");
                 direct_request(res,req,OP);
                 dh_get_secret( secret, res,
                         "HMAC-SHA1", "DH-SHA1",
                         dh, SHA_DIGEST_LENGTH, SHA1, SHA_DIGEST_LENGTH );
                 expires_in = util::string_to_long(res.get_field("expires_in"));
             }catch(bad_input&) {
                 throw dumb_RP(OPKELE_CP_ "OP failed to supply an association");
             }
         }
         return store_assoc(
                 OP, res.get_field("assoc_handle"),
                 res.get_field("assoc_type"), secret,
                 expires_in );
     }
 
     basic_openid_message& basic_RP::checkid_(
             basic_openid_message& rv,
             mode_t mode,
             const string& return_to,const string& realm,
             extension_t *ext) {
         rv.reset_fields();
         rv.set_field("ns",OIURI_OPENID20);
         if(mode==mode_checkid_immediate)
             rv.set_field("mode","checkid_immediate");
         else if(mode==mode_checkid_setup)
             rv.set_field("mode","checkid_setup");
         else
             throw bad_input(OPKELE_CP_ "unknown checkid_* mode");
         if(realm.empty() && return_to.empty())
             throw bad_input(OPKELE_CP_ "At least one of realm and return_to must be non-empty");
         if(!realm.empty()) {
             rv.set_field("realm",realm);
             rv.set_field("trust_root",realm);
         }
         if(!return_to.empty())
             rv.set_field("return_to",return_to);
         const openid_endpoint_t& ep = get_endpoint();
         rv.set_field("claimed_id",ep.claimed_id);
         rv.set_field("identity",ep.local_id);
         try {
             rv.set_field("assoc_handle",find_assoc(ep.uri)->handle());
         }catch(dumb_RP& drp) {
         }catch(failed_lookup& fl) {
             try {
                 rv.set_field("assoc_handle",associate(ep.uri)->handle());
             }catch(dumb_RP& drp) { }
         } OPKELE_RETHROW
         if(ext) ext->rp_checkid_hook(rv);
         return rv;
     }
 
     class signed_part_message_proxy : public basic_openid_message {
         public:
             const basic_openid_message& x;
             set<string> signeds;
 
             signed_part_message_proxy(const basic_openid_message& xx) : x(xx) {
                 const string& slist = x.get_field("signed");
                 string::size_type p = 0;
                 while(true) {
                     string::size_type co = slist.find(',',p);
                     string f = (co==string::npos)
                         ?slist.substr(p):slist.substr(p,co-p);
                     signeds.insert(f);
                     if(co==string::npos) break;
                     p = co+1;
                 }
             }
 
             bool has_field(const string& n) const {
                 return signeds.find(n)!=signeds.end() && x.has_field(n); }
             const string& get_field(const string& n) const {
                 if(signeds.find(n)==signeds.end())
                     throw failed_lookup(OPKELE_CP_ "The field isn't known to be signed");
                 return x.get_field(n); }
 
             fields_iterator fields_begin() const {
                 return signeds.begin(); }
             fields_iterator fields_end() const {
                 return signeds.end(); }
     };
 
     static void parse_query(const string& u,string::size_type q,
             map<string,string>& p) {
         if(q==string::npos)
             return;
         assert(u[q]=='?');
         ++q;
         string::size_type l = u.size();
         while(q<l) {
             string::size_type eq = u.find('=',q);
             string::size_type am = u.find('&',q);
             if(am==string::npos) {
                 if(eq==string::npos) {
                     p[""] = u.substr(q);
                 }else{
                     p[u.substr(q,eq-q)] = u.substr(eq+1);
                 }
                 break;
             }else{
                 if(eq==string::npos || eq>am) {
                     p[""] = u.substr(q,eq-q);
                 }else{
                     p[u.substr(q,eq-q)] = u.substr(eq+1,am-eq-1);
                 }
                 q = ++am;
             }
         }
     }
 
     void basic_RP::id_res(const basic_openid_message& om,extension_t *ext) {
         reset_vars();
         bool o2 = om.has_field("ns")
-            && om.get_field("ns")==OIURI_OPENID20 && !om.get_field("op_endpoint").empty();
+            && om.get_field("ns")==OIURI_OPENID20
+            && om.has_field("op_endpoint") && !om.get_field("op_endpoint").empty();
         if( (!o2) && om.has_field("user_setup_url"))
             throw id_res_setup(OPKELE_CP_ "assertion failed, setup url provided",
                     om.get_field("user_setup_url"));
         string m = om.get_field("mode");
         if(o2 && m=="setup_needed")
             throw id_res_setup(OPKELE_CP_ "setup needed, no setup url provided");
         if(m=="cancel")
             throw id_res_cancel(OPKELE_CP_ "authentication cancelled");
         bool go_dumb=false;
         try {
             string OP = o2
                 ?om.get_field("op_endpoint")
                 :get_endpoint().uri;
             assoc_t assoc = retrieve_assoc(
                     OP,om.get_field("assoc_handle"));
             if(om.get_field("sig")!=util::base64_signature(assoc,om))
                 throw id_res_mismatch(OPKELE_CP_ "signature mismatch");
         }catch(dumb_RP& drp) {
             go_dumb=true;
         }catch(failed_lookup& e) {
             go_dumb=true;
         } OPKELE_RETHROW
         if(go_dumb) {
             try {
                 string OP = o2
                     ?om.get_field("op_endpoint")
                     :get_endpoint().uri;
                 check_authentication(OP,om);
             }catch(failed_check_authentication& fca) {
                 throw id_res_failed(OPKELE_CP_ "failed to check_authentication()");
             } OPKELE_RETHROW
         }
         signed_part_message_proxy signeds(om);
         if(o2) {
             check_nonce(om.get_field("op_endpoint"),
                     om.get_field("response_nonce"));
             static const char *mustsign[] = {
                 "op_endpoint", "return_to", "response_nonce", "assoc_handle",
                 "claimed_id", "identity" };
             for(size_t ms=0;ms<(sizeof(mustsign)/sizeof(*mustsign));++ms) {
                 if(om.has_field(mustsign[ms]) && !signeds.has_field(mustsign[ms]))
                     throw bad_input(OPKELE_CP_ string("Field '")+mustsign[ms]+"' is not signed against the specs");
             }
             if( (
                     (om.has_field("claimed_id")?1:0)
                     ^
                     (om.has_field("identity")?1:0)
                 )&1 )
                 throw bad_input(OPKELE_CP_ "claimed_id and identity must be either both present or both absent");
 
             string turl = util::rfc_3986_normalize_uri(get_this_url());
             util::strip_uri_fragment_part(turl);
             string rurl = util::rfc_3986_normalize_uri(om.get_field("return_to"));
             util::strip_uri_fragment_part(rurl);
             string::size_type
                 tq = turl.find('?'), rq = rurl.find('?');
             if(
                     ((tq==string::npos)?turl:turl.substr(0,tq))
                     !=
                     ((rq==string::npos)?rurl:rurl.substr(0,rq))
               )
                 throw id_res_bad_return_to(OPKELE_CP_ "return_to url doesn't match request url");
             map<string,string> tp; parse_query(turl,tq,tp);
             map<string,string> rp; parse_query(rurl,rq,rp);
             for(map<string,string>::const_iterator rpi=rp.begin();rpi!=rp.end();++rpi) {
                 map<string,string>::const_iterator tpi = tp.find(rpi->first);
                 if(tpi==tp.end())
                     throw id_res_bad_return_to(OPKELE_CP_ string("Parameter '")+rpi->first+"' from return_to is missing from the request");
                 if(tpi->second!=rpi->second)
                     throw id_res_bad_return_to(OPKELE_CP_ string("Parameter '")+rpi->first+"' from return_to doesn't matche the request");
             }
 
             if(om.has_field("claimed_id")) {
                 claimed_id = om.get_field("claimed_id");
                 identity = om.get_field("identity");
                 verify_OP(
                         om.get_field("op_endpoint"),
                         claimed_id, identity );
             }
 
         }else{
             claimed_id = get_endpoint().claimed_id;
             /* TODO: check if this is the identity we asked for */
             identity = om.get_field("identity");
         }
         if(ext) ext->rp_id_res_hook(om,signeds);
     }
 
     void basic_RP::check_authentication(const string& OP,
             const basic_openid_message& om){
         openid_message_t res;
         static const string checkauthmode = "check_authentication";
         direct_request(res,util::change_mode_message_proxy(om,checkauthmode),OP);
         if(res.has_field("is_valid")) {
             if(res.get_field("is_valid")=="true") {
                 if(res.has_field("invalidate_handle"))
                     invalidate_assoc(OP,res.get_field("invalidate_handle"));
                 return;
             }
         }
         throw failed_check_authentication(
                 OPKELE_CP_ "failed to verify response");
     }
 
 }