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authorMatthias Schiffer <matthias@gamezock.de>2009-08-16 03:01:12 +0200
committerMatthias Schiffer <matthias@gamezock.de>2009-08-16 03:01:12 +0200
commitb6f7d36a544a7a8c18c815ef4158cf684108d06d (patch)
tree417e12f98f5b2c6d03bd740999532e61d60a664a
parentc1cb92bc30256171bfafb22cf8512142afee97cf (diff)
downloadmad-b6f7d36a544a7a8c18c815ef4158cf684108d06d.tar
mad-b6f7d36a544a7a8c18c815ef4158cf684108d06d.zip
Passwörter können gesetzt werden
-rw-r--r--src/Client/CommandParser.cpp1
-rw-r--r--src/Client/UserCommands.cpp64
-rw-r--r--src/Client/UserCommands.h2
-rw-r--r--src/Common/Backends/NetworkUserBackend.cpp27
-rw-r--r--src/Common/Backends/NetworkUserBackend.h17
-rw-r--r--src/Common/UserCache.h10
-rw-r--r--src/Common/UserConfigBackend.h22
-rw-r--r--src/Common/UserDBBackend.h10
-rw-r--r--src/Common/UserManager.cpp43
-rw-r--r--src/Common/UserManager.h4
-rw-r--r--src/Server/RequestHandlers/UserRequestHandlerGroup.cpp9
-rw-r--r--src/Server/RequestHandlers/UserRequestHandlerGroup.h2
-rw-r--r--src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.cpp23
-rw-r--r--src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.h2
14 files changed, 203 insertions, 33 deletions
diff --git a/src/Client/CommandParser.cpp b/src/Client/CommandParser.cpp
index b06f4b4..56ecbba 100644
--- a/src/Client/CommandParser.cpp
+++ b/src/Client/CommandParser.cpp
@@ -55,6 +55,7 @@ const CommandParser::Command CommandParser::commands[] = {
{{"delete_group", 0}, "delete_group did", "Delete group", "Delete a user group from the account database.", &UserCommands::deleteGroupCommand},
{{"add_user_to_group", 0}, "add_user_to_group uid gid", "Add a user to a group", "Add a user to a group.", &UserCommands::addUserToGroupCommand},
{{"delete_user_from_group", 0}, "delete_user_from_group uid gid", "Remove a user from a group", "Remove a user from a group.", &UserCommands::deleteUserFromGroupCommand},
+ {{"set_password", "password", 0}, "set_password uid", "Set the password of a user", "Set the password of a user.", &UserCommands::setPasswordCommand},
{{"exit", "quit", 0}, "exit", "Close the connection and quit the client", "Close the connection and quit the client.", &CommandParser::exitCommand},
{{0}, 0, 0, 0, 0}
};
diff --git a/src/Client/UserCommands.cpp b/src/Client/UserCommands.cpp
index b93de94..21259d0 100644
--- a/src/Client/UserCommands.cpp
+++ b/src/Client/UserCommands.cpp
@@ -22,10 +22,10 @@
#include "CommandParser.h"
#include <Common/RequestManager.h>
-
#include <Common/UserManager.h>
#include <iostream>
+#include <termios.h>
namespace Mad {
@@ -491,5 +491,67 @@ void UserCommands::deleteUserFromGroupCommand(CommandParser *commandParser, cons
}
}
+void UserCommands::setPasswordCommand(CommandParser *commandParser, const std::vector<std::string> &args) {
+ if(args.size() < 2) {
+ std::cerr << args[0] << ": Too few arguments." << std::endl;
+ commandParser->printUsage("set_password");
+ return;
+ }
+ if(args.size() > 2) {
+ std::cerr << args[0] << ": Too many arguments." << std::endl;
+ commandParser->printUsage("set_password");
+ return;
+ }
+
+ char *endptr;
+ unsigned long uid = std::strtoul(args[1].c_str(), &endptr, 10);
+ if(args[1].empty() || *endptr != '\0') {
+ std::cerr << args[0] << ": Unable to parse user id." << std::endl;
+ commandParser->printUsage("set_password");
+ return;
+ }
+
+ // TODO Extract this as a method
+ struct termios termold, termnew;
+
+ if(tcgetattr(STDIN_FILENO, &termold) != 0) {
+ std::cerr << "Unable to set up terminal for password entry." << std::endl;
+ return;
+ }
+
+ termnew = termold;
+ termnew.c_lflag &= ~ECHO;
+ if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &termnew) != 0) {
+ std::cerr << "Unable to set up terminal for password entry." << std::endl;
+ return;
+ }
+
+ std::string password, password2;
+
+ std::cout << "Password: " << std::flush;
+ std::getline(std::cin, password);
+ std::cout << std::endl;
+
+ std::cout << "Verify password: " << std::flush;
+ std::getline(std::cin, password2);
+ std::cout << std::endl;
+
+ tcsetattr(STDIN_FILENO, TCSAFLUSH, &termold);
+
+ if(password != password2) {
+ std::cerr << "Passwords do not match." << std::endl;
+ return;
+ }
+
+ try {
+ commandParser->application->getUserManager()->setPassword(uid, password);
+
+ std::cout << "Password set." << std::endl;
+ }
+ catch(Core::Exception e) {
+ std::cerr << "An error occurred during your request: " << e.strerror() << "." << std::endl;
+ }
+}
+
}
}
diff --git a/src/Client/UserCommands.h b/src/Client/UserCommands.h
index 62d42c1..d5422da 100644
--- a/src/Client/UserCommands.h
+++ b/src/Client/UserCommands.h
@@ -52,6 +52,8 @@ class UserCommands {
static void addUserToGroupCommand(CommandParser *commandParser, const std::vector<std::string> &args);
static void deleteUserFromGroupCommand(CommandParser *commandParser, const std::vector<std::string> &args);
+
+ static void setPasswordCommand(CommandParser *commandParser, const std::vector<std::string> &args);
};
}
diff --git a/src/Common/Backends/NetworkUserBackend.cpp b/src/Common/Backends/NetworkUserBackend.cpp
index da964e7..00bd378 100644
--- a/src/Common/Backends/NetworkUserBackend.cpp
+++ b/src/Common/Backends/NetworkUserBackend.cpp
@@ -115,6 +115,15 @@ void NetworkUserBackend::UserGroupRequest::sendRequest() {
sendPacket(packet);
}
+void NetworkUserBackend::PasswordRequest::sendRequest() {
+ XmlPacket packet;
+ packet.setType("SetPassword");
+ packet.set("uid", uid);
+ packet.set("password", password);
+
+ sendPacket(packet);
+}
+
boost::shared_ptr<const std::map<unsigned long, UserInfo> > NetworkUserBackend::getUserList(boost::posix_time::ptime *timestamp) throw(Core::Exception) {
application->getThreadManager()->detach();
@@ -397,11 +406,6 @@ boost::shared_ptr<const std::multimap<unsigned long, unsigned long> > NetworkUse
}
-/*void NetworkUserBackend::setPassword(unsigned long uid, const std::string &password) throw(Core::Exception) {
-
-}*/
-
-
void NetworkUserBackend::checkUserInfo(const UserInfo &userInfo) throw(Core::Exception) {
application->getThreadManager()->detach();
@@ -524,6 +528,19 @@ void NetworkUserBackend::deleteUserFromGroup(unsigned long uid, unsigned long gi
throw result.second;
}
+
+void NetworkUserBackend::setPassword(unsigned long uid, const std::string &password) throw(Core::Exception) {
+ application->getThreadManager()->detach();
+
+ boost::shared_ptr<PasswordRequest> request(new PasswordRequest(application, uid, password));
+ application->getRequestManager()->sendRequest(connection, request);
+ request->wait();
+
+ std::pair<boost::shared_ptr<const XmlPacket>, Core::Exception> result = request->getResult();
+ if(!result.first || result.second)
+ throw result.second;
+}
+
}
}
}
diff --git a/src/Common/Backends/NetworkUserBackend.h b/src/Common/Backends/NetworkUserBackend.h
index a3fa1a6..1ab0b58 100644
--- a/src/Common/Backends/NetworkUserBackend.h
+++ b/src/Common/Backends/NetworkUserBackend.h
@@ -137,6 +137,19 @@ class NetworkUserBackend : public UserDBBackend {
: Request(application), type(type0), uid(uid0), gid(gid0) {}
};
+ class PasswordRequest : public Request {
+ private:
+ unsigned long uid;
+ std::string password;
+
+ protected:
+ virtual void sendRequest();
+
+ public:
+ PasswordRequest(Application *application, unsigned long uid0, const std::string &password0)
+ : Request(application), uid(uid0), password(password0) {}
+ };
+
static const std::string name;
Application *application;
@@ -155,8 +168,6 @@ class NetworkUserBackend : public UserDBBackend {
virtual boost::shared_ptr<const std::multimap<unsigned long, unsigned long> > getFullUserGroupList(boost::posix_time::ptime *timestamp) throw(Core::Exception);
- //virtual void setPassword(unsigned long uid, const std::string &password) throw(Core::Exception);
-
virtual void checkUserInfo(const UserInfo &userInfo) throw(Core::Exception);
virtual void addUser(const UserInfo &userInfo) throw(Core::Exception);
virtual void updateUser(unsigned long uid, const Common::UserInfo &userInfo) throw(Core::Exception);
@@ -170,6 +181,8 @@ class NetworkUserBackend : public UserDBBackend {
virtual void addUserToGroup(unsigned long uid, unsigned long gid) throw(Core::Exception);
virtual void deleteUserFromGroup(unsigned long uid, unsigned long gid) throw(Core::Exception);
+ virtual void setPassword(unsigned long uid, const std::string &password) throw(Core::Exception);
+
public:
NetworkUserBackend(Application *application0, Connection *connection0) : application(application0), connection(connection0) {}
diff --git a/src/Common/UserCache.h b/src/Common/UserCache.h
index 1912caa..bec3328 100644
--- a/src/Common/UserCache.h
+++ b/src/Common/UserCache.h
@@ -70,11 +70,6 @@ class UserCache : public UserDBBackend, private boost::noncopyable {
virtual boost::shared_ptr<const std::multimap<unsigned long, unsigned long> > getFullUserGroupList(boost::posix_time::ptime *timestamp) throw(Core::Exception);
- virtual void setPassword(unsigned long uid, const std::string &password) throw(Core::Exception) {
- backend->setPassword(uid, password);
- }
-
-
virtual void checkUserInfo(const UserInfo &userInfo) throw(Core::Exception) {
backend->checkUserInfo(userInfo);
}
@@ -117,6 +112,11 @@ class UserCache : public UserDBBackend, private boost::noncopyable {
backend->deleteUserFromGroup(uid, gid);
}
+
+ virtual void setPassword(unsigned long uid, const std::string &password) throw(Core::Exception) {
+ backend->setPassword(uid, password);
+ }
+
UserCache(Application *application0, boost::shared_ptr<UserDBBackend> backend0) : application(application0), backend(backend0),
userTime(boost::posix_time::not_a_date_time), groupTime(boost::posix_time::not_a_date_time),
userGroupTime(boost::posix_time::not_a_date_time) {}
diff --git a/src/Common/UserConfigBackend.h b/src/Common/UserConfigBackend.h
index 0c1f146..94550eb 100644
--- a/src/Common/UserConfigBackend.h
+++ b/src/Common/UserConfigBackend.h
@@ -36,18 +36,22 @@ class UserConfigBackend {
virtual void checkUserInfo(const UserInfo& /*userInfo*/) throw(Core::Exception) {}
- virtual void addUser(const UserInfo& /*userInfo*/) throw(Core::Exception) {}
- virtual void updateUser(const UserInfo& /*oldUserInfo*/, const UserInfo& /*userInfo*/) throw(Core::Exception) {}
- virtual void deleteUser(const UserInfo& /*userInfo*/) throw(Core::Exception) {}
+ virtual void addUser(const UserInfo &/*userInfo*/) throw(Core::Exception) {}
+ virtual void updateUser(const UserInfo &/*oldUserInfo*/, const UserInfo &/*userInfo*/) throw(Core::Exception) {}
+ virtual void deleteUser(const UserInfo &/*userInfo*/) throw(Core::Exception) {}
- virtual void checkGroupInfo(const GroupInfo& /*groupInfo*/) throw(Core::Exception) {}
+ virtual void checkGroupInfo(const GroupInfo &/*groupInfo*/) throw(Core::Exception) {}
- virtual void addGroup(const GroupInfo& /*groupInfo*/) throw(Core::Exception) {}
- virtual void updateGroup(const GroupInfo& /*oldGroupInfo*/, const GroupInfo& /*groupInfo*/) throw(Core::Exception) {}
- virtual void deleteGroup(const GroupInfo& /*groupInfo*/) throw(Core::Exception) {}
+ virtual void addGroup(const GroupInfo &/*groupInfo*/) throw(Core::Exception) {}
+ virtual void updateGroup(const GroupInfo &/*oldGroupInfo*/, const GroupInfo &/*groupInfo*/) throw(Core::Exception) {}
+ virtual void deleteGroup(const GroupInfo &/*groupInfo*/) throw(Core::Exception) {}
- virtual void addUserToGroup(const UserInfo& /*userInfo*/, const GroupInfo& /*groupInfo*/) throw(Core::Exception) {}
- virtual void deleteUserFromGroup(const UserInfo& /*userInfo*/, const GroupInfo& /*groupInfo*/) throw(Core::Exception) {}
+ virtual void addUserToGroup(const UserInfo &/*userInfo*/, const GroupInfo &/*groupInfo*/) throw(Core::Exception) {}
+ virtual void deleteUserFromGroup(const UserInfo &/*userInfo*/, const GroupInfo &/*groupInfo*/) throw(Core::Exception) {}
+
+ virtual void setPassword(const Common::UserInfo &/*userInfo*/, const std::string &/*password*/) throw(Core::Exception) {
+ throw(Core::Exception(Core::Exception::NOT_IMPLEMENTED));
+ }
};
}
diff --git a/src/Common/UserDBBackend.h b/src/Common/UserDBBackend.h
index 4a33f3a..664739c 100644
--- a/src/Common/UserDBBackend.h
+++ b/src/Common/UserDBBackend.h
@@ -85,11 +85,6 @@ class UserDBBackend {
}
- virtual void setPassword(unsigned long /*uid*/, const std::string& /*password*/) throw(Core::Exception) {
- throw(Core::Exception(Core::Exception::NOT_IMPLEMENTED));
- }
-
-
virtual void checkUserInfo(const UserInfo& /*userInfo*/) throw(Core::Exception) {}
virtual void addUser(const UserInfo& /*userInfo*/) throw(Core::Exception) {
@@ -127,6 +122,11 @@ class UserDBBackend {
throw(Core::Exception(Core::Exception::NOT_IMPLEMENTED));
}
+
+ virtual void setPassword(unsigned long /*uid*/, const std::string& /*password*/) throw(Core::Exception) {
+ throw(Core::Exception(Core::Exception::NOT_IMPLEMENTED));
+ }
+
public:
virtual ~UserDBBackend() {}
diff --git a/src/Common/UserManager.cpp b/src/Common/UserManager.cpp
index bb4d205..d04a644 100644
--- a/src/Common/UserManager.cpp
+++ b/src/Common/UserManager.cpp
@@ -203,10 +203,6 @@ boost::shared_ptr<const std::multimap<unsigned long, unsigned long> > UserManage
return dbBackend->getFullUserGroupList(timestamp);
}
-void UserManager::setPassword(unsigned long /*uid*/, const std::string& /*password*/) throw(Core::Exception) {
- throw Core::Exception(Core::Exception::NOT_AVAILABLE);
-}
-
void UserManager::checkUserInfo(const UserInfo &userInfo) throw(Core::Exception) {
boost::shared_lock<boost::shared_mutex> lock(mutex);
@@ -422,5 +418,44 @@ void UserManager::deleteUserFromGroup(unsigned long uid, unsigned long gid) thro
}
}
+void UserManager::setPassword(unsigned long uid, const std::string &password) throw(Core::Exception) {
+ boost::lock_guard<boost::shared_mutex> lock(mutex);
+
+ if(!dbBackend)
+ throw Core::Exception(Core::Exception::NOT_AVAILABLE);
+
+ boost::shared_ptr<const UserInfo> userInfo = dbBackend->getUserInfo(uid, 0);
+ if(!userInfo)
+ throw Core::Exception(Core::Exception::NOT_FOUND);
+
+ bool ok = false;
+ Core::Exception exception;
+
+ try {
+ dbBackend->setPassword(uid, password);
+ ok = true;
+ }
+ catch(Core::Exception e) {
+ exception = e;
+
+ if(e.getErrorCode() != Core::Exception::NOT_IMPLEMENTED)
+ application->log(Core::LoggerBase::USER, Core::LoggerBase::WARNING, e.strerror());
+ }
+
+ for(std::set<boost::shared_ptr<UserConfigBackend> >::iterator configBackend = configBackends.begin(); configBackend != configBackends.end(); ++configBackend) {
+ try {
+ (*configBackend)->setPassword(*userInfo, password);
+ ok = true;
+ }
+ catch(Core::Exception e) {
+ if(e.getErrorCode() != Core::Exception::NOT_IMPLEMENTED)
+ application->log(Core::LoggerBase::USER, Core::LoggerBase::WARNING, e.strerror());
+ }
+ }
+
+ if(!ok)
+ throw exception;
+}
+
}
}
diff --git a/src/Common/UserManager.h b/src/Common/UserManager.h
index c70894a..b966662 100644
--- a/src/Common/UserManager.h
+++ b/src/Common/UserManager.h
@@ -115,8 +115,6 @@ class UserManager : public Core::Configurable, private boost::noncopyable {
boost::shared_ptr<const std::multimap<unsigned long, unsigned long> > getFullUserGroupList(boost::posix_time::ptime *timestamp = 0) throw(Core::Exception);
- void setPassword(unsigned long uid, const std::string &password) throw(Core::Exception);
-
void checkUserInfo(const UserInfo &userInfo) throw(Core::Exception);
void addUser(const UserInfo &userInfo) throw(Core::Exception);
void updateUser(unsigned long uid, const UserInfo &userInfo) throw(Core::Exception);
@@ -129,6 +127,8 @@ class UserManager : public Core::Configurable, private boost::noncopyable {
void addUserToGroup(unsigned long uid, unsigned long gid) throw(Core::Exception);
void deleteUserFromGroup(unsigned long uid, unsigned long gid) throw(Core::Exception);
+
+ void setPassword(unsigned long uid, const std::string &password) throw(Core::Exception);
};
}
diff --git a/src/Server/RequestHandlers/UserRequestHandlerGroup.cpp b/src/Server/RequestHandlers/UserRequestHandlerGroup.cpp
index c0de46a..a1aa829 100644
--- a/src/Server/RequestHandlers/UserRequestHandlerGroup.cpp
+++ b/src/Server/RequestHandlers/UserRequestHandlerGroup.cpp
@@ -331,6 +331,13 @@ void UserRequestHandlerGroup::handleDeleteUserFromGroupRequest(boost::shared_ptr
ret->setType("OK");
}
+void UserRequestHandlerGroup::handlePasswordSetRequest(boost::shared_ptr<const Common::XmlPacket> packet, Common::XmlPacket *ret,
+ Common::Connection* /*connection*/) {
+ application->getUserManager()->setPassword(packet->get<unsigned long>("uid"), packet->get<const std::string&>("password"));
+
+ ret->setType("OK");
+}
+
UserRequestHandlerGroup::UserRequestHandlerGroup(Application *application0) : application(application0) {
registerHandler("ListUsers", boost::bind(&UserRequestHandlerGroup::handleUserListRequest, this, _1, _2, _3));
registerHandler("GetUserInfo", boost::bind(&UserRequestHandlerGroup::handleUserInfoRequest, this, _1, _2, _3));
@@ -354,6 +361,8 @@ UserRequestHandlerGroup::UserRequestHandlerGroup(Application *application0) : ap
registerHandler("AddUserToGroup", boost::bind(&UserRequestHandlerGroup::handleAddUserToGroupRequest, this, _1, _2, _3));
registerHandler("DeleteUserFromGroup", boost::bind(&UserRequestHandlerGroup::handleDeleteUserFromGroupRequest, this, _1, _2, _3));
+
+ registerHandler("SetPassword", boost::bind(&UserRequestHandlerGroup::handlePasswordSetRequest, this, _1, _2, _3));
}
}
diff --git a/src/Server/RequestHandlers/UserRequestHandlerGroup.h b/src/Server/RequestHandlers/UserRequestHandlerGroup.h
index c1338c4..ee4b7f4 100644
--- a/src/Server/RequestHandlers/UserRequestHandlerGroup.h
+++ b/src/Server/RequestHandlers/UserRequestHandlerGroup.h
@@ -56,6 +56,8 @@ class UserRequestHandlerGroup : public Common::RequestHandlers::SimpleRequestHan
void handleAddUserToGroupRequest(boost::shared_ptr<const Common::XmlPacket> packet, Common::XmlPacket *ret, Common::Connection *connection);
void handleDeleteUserFromGroupRequest(boost::shared_ptr<const Common::XmlPacket> packet, Common::XmlPacket *ret, Common::Connection *connection);
+ void handlePasswordSetRequest(boost::shared_ptr<const Common::XmlPacket> packet, Common::XmlPacket *ret, Common::Connection *connection);
+
public:
UserRequestHandlerGroup(Application *application0);
};
diff --git a/src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.cpp b/src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.cpp
index 5a577ad..9a43691 100644
--- a/src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.cpp
+++ b/src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.cpp
@@ -19,6 +19,7 @@
#include "UserConfigBackendKrb5.h"
#include <Core/ConfigEntry.h>
+#include <Core/ThreadManager.h>
#include <cstring>
@@ -125,6 +126,8 @@ void UserConfigBackendKrb5::checkUserInfo(const Common::UserInfo &userInfo) thro
}
void UserConfigBackendKrb5::addUser(const Common::UserInfo &userInfo) throw(Core::Exception) {
+ application->getThreadManager()->detach();
+
std::string princStr = userInfo.getUsername() + "@" + realm;
kadm5_principal_ent_rec princ;
@@ -169,6 +172,8 @@ void UserConfigBackendKrb5::updateUser(const Common::UserInfo &oldUserInfo, cons
}
void UserConfigBackendKrb5::deleteUser(const Common::UserInfo &userInfo) throw(Core::Exception) {
+ application->getThreadManager()->detach();
+
std::string princStr = userInfo.getUsername() + "@" + realm;
krb5_principal princ;
@@ -184,6 +189,24 @@ void UserConfigBackendKrb5::deleteUser(const Common::UserInfo &userInfo) throw(C
// throw Core::Exception("kadm5_delete_principal", Core::Exception::INTERNAL_ERRNO, err);
}
+void UserConfigBackendKrb5::setPassword(const Common::UserInfo &userInfo, const std::string &password) throw(Core::Exception) {
+ application->getThreadManager()->detach();
+
+ std::string princStr = userInfo.getUsername() + "@" + realm;
+ krb5_principal princ;
+
+ krb5_error_code err = krb5_parse_name(context, princStr.c_str(), &princ);
+ if(err)
+ throw Core::Exception("krb5_parse_name", Core::Exception::INTERNAL_ERRNO, err);
+
+ err = kadm5_chpass_principal(handle, princ, const_cast<char*>(password.c_str()));
+
+ krb5_free_principal(context, princ);
+
+ if(err)
+ throw Core::Exception("kadm5_chpass_principal", Core::Exception::INTERNAL_ERRNO, err);
+}
+
}
}
}
diff --git a/src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.h b/src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.h
index afb7663..6571220 100644
--- a/src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.h
+++ b/src/modules/UserConfigBackendKrb5/UserConfigBackendKrb5.h
@@ -58,6 +58,8 @@ class UserConfigBackendKrb5 : public Common::UserConfigBackend, private Core::Co
virtual void updateUser(const Common::UserInfo &oldUserInfo, const Common::UserInfo &userInfo) throw(Core::Exception);
virtual void deleteUser(const Common::UserInfo &userInfo) throw(Core::Exception);
+ virtual void setPassword(const Common::UserInfo &userInfo, const std::string &password) throw(Core::Exception);
+
public:
UserConfigBackendKrb5(Common::Application *application0) : application(application0), handle(0) {
krb5_error_code err = krb5_init_context(&context);