Add SAML2 ECP login method

Makefile

@@ -2,11 +2,11 @@ CPP=g++
 CC=gcc
 AR=ar
 CFLAGS=-fPIC -Ofast
-CPPFLAGS=-fPIC --std=c++11 -Ofast -Irestclient-cpp/include
+CPPFLAGS=-fPIC --std=c++11 -Ofast -Irestclient-cpp/include `pkg-config --cflags lasso`
 LDFLAGS=--shared
-LIBS=-lrestclient-cpp -lcurl
+LIBS=-lrestclient-cpp -lcurl `pkg-config --libs lasso` -lgobject-2.0 -lgumbo -lgq
 SONAME=_occi.so
-SOURCES=compute.cpp entity.cpp network.cpp occisession.cpp resource.cpp storage.cpp template.cpp link.cpp
+SOURCES=compute.cpp entity.cpp network.cpp occisession.cpp resource.cpp storage.cpp template.cpp link.cpp saml2_ecp.cpp
 
 SWIG=swig
 SWIG_INTERFACES=occilib.i

occisession.cpp

@@ -23,6 +23,7 @@
 #include "json.hpp"
 
 #include "occisession.h"
+#include "saml2_ecp.h"
 
 #include <gq/Document.h>
 #include <gq/Node.h>
@@ -143,6 +144,20 @@ void OcciSession::BMELogin(string username, string password,  bool insecure){
     this->connection->setCookies(r.cookies);
 }
 
+
+void OcciSession::saml2EcpLogin(std::string username,
+                                std::string password,
+                                std::string metadata,
+                                bool insecure){
+
+    auto r = saml2_ecp_login(username, password,
+                             url + "/saml2/login/",
+                             metadata,
+                             insecure);
+    this->connection->setCookies(r.cookies);
+
+}
+
 json OcciSession::queryInterface(){
     return get("-/");
 }

occisession.h

@@ -60,6 +60,10 @@ namespace OcciClient {
         void circleOcciLogin(std::string username, std::string password);
 
         void BMELogin(std::string username, std::string password, bool insecure=false);
+        void saml2EcpLogin(std::string username,
+                           std::string password,
+                           std::string metadata,
+                           bool insecure=false);
 
         nlohmann::json queryInterface();
     };

occisession.i

@@ -8,5 +8,10 @@ namespace OcciClient{
         OcciSession(const char* url, bool insecure = false, bool csrf = false);
         ~OcciSession();
         void circleOcciLogin(std::string username, std::string password);
+        void BMELogin(std::string username, std::string password, bool insecure=false);
+        void saml2EcpLogin(std::string username,
+                           std::string password,
+                           std::string metadata,
+                           bool insecure=false);
     };
 }

saml2_ecp.cpp

+#include "saml2_ecp.h"
+
+#include <restclient-cpp/connection.h>
+#include <lasso/lasso.h>
+#include <lasso/xml/soap-1.1/xml_soap11.h>
+
+#include <iostream>
+#include <fstream>
+#include <string>
+
+
+using namespace RestClient;
+
+
+namespace OcciClient{
+
+
+static inline void check_error(int error_code){
+        if(error_code < 0)
+            throw std::runtime_error(lasso_strerror(error_code));
+}
+
+
+static inline void check_http_error(Response resp){
+
+    if(resp.code < 400) return;
+    LassoSoapFault* fault = lasso_soap_fault_new_from_message(resp.body.c_str());
+    const char* message = fault->faultstring;
+    if(message == NULL) message = resp.body.c_str();
+    throw HttpError(message, resp.code);
+
+}
+
+
+// SAML2 Profile for ECP (Section 4.2) defines these steps for an ECP
+// transaction
+// 
+// 1. ECP issues HTTP Request to SP
+// 2. SP issues <AuthnRequest> to ECP using PAOS
+// 3. ECP determines IdP
+// 4. ECP conveys <AuthnRequest> to IdP using SOAP
+// 5. IdP identifies principal
+// 6. IdP issues <Response> to ECP, targeted at SP using SOAP
+// 7. ECP conveys <Response> to SP using PAOS
+// 8. SP grants or denies access to principal
+
+RestClient::Response saml2_ecp_login(std::string username,
+                                     std::string password,
+                                     std::string login_url,
+                                     std::string metadata,
+                                     bool insecure){
+    lasso_init();
+
+    auto con = Connection("");
+    Response r;
+
+    if (insecure) {
+        con.SetHostVerify(false);
+        con.SetPeerVerify(false);
+    }
+
+    // init ECP session
+    LassoServer* ecpContext = lasso_server_new(NULL, NULL, NULL, NULL);
+    if(ecpContext == NULL)
+        throw std::runtime_error("Cannot create ECP client (ecpContext)");
+    lasso_provider_set_protocol_conformance(LASSO_PROVIDER(ecpContext),
+                                            LASSO_PROTOCOL_SAML_2_0);
+    check_error(lasso_server_add_provider(ecpContext, LASSO_PROVIDER_ROLE_IDP,
+                                          metadata.c_str(), NULL, NULL));
+
+    LassoEcp* ecp = lasso_ecp_new(ecpContext);
+    if(ecp == NULL)
+        throw std::runtime_error("Cannot create ECP client (ecp)");
+
+    try{
+        // phase 1.
+        HeaderFields headers;
+        headers["Accept"] = MEDIA_TYPE_PAOS;
+        headers["PAOS"] = PAOS_HEADER;  
+        con.SetHeaders(headers);
+        r = con.get(login_url);
+        check_http_error(r);
+
+        // phase 2-6.
+        check_error(lasso_ecp_process_authn_request_msg(ecp, r.body.c_str()));
+        con.SetBasicAuth(username, password);
+        headers["Content-Type"] = MEDIA_TYPE_SOAP;
+        con.SetHeaders(headers);
+        LassoProfile* profile = LASSO_PROFILE(ecp);
+        r = con.post(profile->msg_url, profile->msg_body);
+        check_http_error(r);
+
+        // phase 7-8.
+        check_error(lasso_ecp_process_response_msg(ecp, r.body.c_str()));
+        headers = HeaderFields();
+        headers["Content-Type"] = MEDIA_TYPE_PAOS;
+        con.SetHeaders(headers);
+        r = con.post(profile->msg_url, profile->msg_body);
+        check_http_error(r);
+    }
+    catch(std::exception&){
+        // destroy session
+        lasso_server_destroy(ecpContext);
+        lasso_ecp_destroy(ecp);
+        lasso_shutdown();
+        throw;
+    }
+    // destroy session
+    lasso_server_destroy(ecpContext);
+    lasso_ecp_destroy(ecp);
+    lasso_shutdown();
+
+    return r;
+
+}
+
+
+}

saml2_ecp.h

+#ifndef SAML2_ECP_H
+#define SAML2_ECP_H
+
+#include <restclient-cpp/restclient.h>
+#include <stdexcept>
+
+#define MEDIA_TYPE_PAOS "application/vnd.paos+xml"
+#define PAOS_HEADER ("ver=\"" LASSO_PAOS_HREF "\";\"" LASSO_ECP_HREF "\"")
+#define MEDIA_TYPE_SOAP "application/soap+xml"
+
+
+namespace OcciClient {
+
+struct HttpError: public std::runtime_error{
+    int status_code;
+    std::string message;
+    
+    HttpError(std::string message, int status_code)
+        :runtime_error(""),status_code(status_code){
+        
+        this->message = std::string("Status code: ") +
+                        std::to_string(status_code) +
+                        " Message: " + message;
+
+    }
+
+    const char* what() const noexcept{
+        return message.c_str();
+    }
+};
+
+RestClient::Response saml2_ecp_login(std::string username,
+                                     std::string password,
+                                     std::string login_url,
+                                     std::string metadata,
+                                     bool insecure=false);
+
+}
+
+
+#endif // SAML2_ECP_H

setup.py

@@ -17,7 +17,13 @@ _occi = Extension('_occi',
                   library_dirs=['.'],
                   swig_opts=['-c++'],
                   extra_compile_args=['-std=c++11', '-Ofast'],
-                  libraries=['occi', 'restclient-cpp', 'curl']
+                  libraries=['occi', 'restclient-cpp', 'curl',
+                             # for BMElogin method
+                             'gq', 'gumbo',
+                             # for saml2EcpLogin method
+                             'lasso', 'xmlsec1', 'gobject-2.0', 'ffi',
+                             'xslt', 'dl', 'xml2', 'z', 'm', 'glib-2.0',
+                             ]
                   )
 
 
@@ -27,6 +33,7 @@ class Build(build_ext):
         check_call(['make', 'lib'])
         build_ext.run(self)
 
+
 setup(
     name='libocci',