Fix authorization for LDAP users

Modified the code to make an asynchronous call to GetUserInfo to get
the user role for authorization.

For local users, DBus matches are used to store user role map hot in
memory. Hence, bmcweb has to know whether a user is a local user or
LDAP user to get the role. To avoid this, removed the existing DBus
matches and modified the code to call GetUserInfo to get the role of
local users as well as LDAP users.

Tested:
-   Created a local user having admin privilege and verified that he is
    able to restart the system
    /redfish/v1/Systems/system/Actions/ComputerSystem.Reset
        -d '{"ResetType": "GracefulRestart"}'
-   Created a local user having user privilege and verified that he is
    unauthorized to restart the system
    /redfish/v1/Systems/system/Actions/ComputerSystem.Reset
        -d '{"ResetType": "GracefulRestart"}'
-   Created a remote user having admin privilege and verified that he is
    able to restart the system
    /redfish/v1/Systems/system/Actions/ComputerSystem.Reset
        -d '{"ResetType": "GracefulRestart"}'
-   Created a remote user having user privilege and verified that he is
    unauthorized to restart the system
    /redfish/v1/Systems/system/Actions/ComputerSystem.Reset
        -d '{"ResetType": "GracefulRestart"}'

Signed-off-by: RAJESWARAN THILLAIGOVINDAN <rajeswgo@in.ibm.com>
Change-Id: Ifd813e1af4dfcb7aeaba18e04b6c9767d2a5e95a

3 files changed, 48 insertions, 285 deletions

diff --git a/http/routing.h b/http/routing.h
index 7846924..0929286 100644
--- a/http/routing.h
+++ b/http/routing.h
@@ -1250,48 +1250,59 @@ class Router
                          << static_cast<uint32_t>(req.method()) << " / "
                          << rules[ruleIndex]->getMethods();
 
-        redfish::Privileges userPrivileges;
-        if (req.session != nullptr)
+        if (req.session == nullptr)
         {
-            // Get the user role from the session.
-            const std::string& userRole =
-                persistent_data::UserRoleMap::getInstance().getUserRole(
-                    req.session->username);
+            rules[ruleIndex]->handle(req, res, found.second);
+            return;
+        }
 
-            BMCWEB_LOG_DEBUG << "USER ROLE=" << userRole;
+        crow::connections::systemBus->async_method_call(
+            [&req, &res, &rules, ruleIndex, found](
+                const boost::system::error_code ec,
+                std::map<std::string, std::variant<bool, std::string,
+                                                   std::vector<std::string>>>
+                    userInfo) {
+                if (ec)
+                {
+                    BMCWEB_LOG_ERROR << "GetUserInfo failed...";
+                    res.result(
+                        boost::beast::http::status::internal_server_error);
+                    res.end();
+                    return;
+                }
 
-            // Get the user privileges from the role
-            userPrivileges = redfish::getUserPrivileges(userRole);
-        }
+                const std::string* userRolePtr = nullptr;
+                auto userInfoIter = userInfo.find("UserPrivilege");
+                if (userInfoIter != userInfo.end())
+                {
+                    userRolePtr =
+                        std::get_if<std::string>(&userInfoIter->second);
+                }
 
-        if (!rules[ruleIndex]->checkPrivileges(userPrivileges))
-        {
-            res.result(boost::beast::http::status::forbidden);
-            res.end();
-            return;
-        }
+                std::string userRole{};
+                if (userRolePtr != nullptr)
+                {
+                    userRole = *userRolePtr;
+                    BMCWEB_LOG_DEBUG << "userName = " << req.session->username
+                                     << " userRole = " << *userRolePtr;
+                }
 
-        // any uncaught exceptions become 500s
-        try
-        {
-            rules[ruleIndex]->handle(req, res, found.second);
-        }
-        catch (std::exception& e)
-        {
-            BMCWEB_LOG_ERROR << "An uncaught exception occurred: " << e.what();
-            res.result(boost::beast::http::status::internal_server_error);
-            res.end();
-            return;
-        }
-        catch (...)
-        {
-            BMCWEB_LOG_ERROR
-                << "An uncaught exception occurred. The type was unknown "
-                   "so no information was available.";
-            res.result(boost::beast::http::status::internal_server_error);
-            res.end();
-            return;
-        }
+                // Get the user privileges from the role
+                redfish::Privileges userPrivileges =
+                    redfish::getUserPrivileges(userRole);
+
+                if (!rules[ruleIndex]->checkPrivileges(userPrivileges))
+                {
+                    res.result(boost::beast::http::status::forbidden);
+                    res.end();
+                    return;
+                }
+
+                rules[ruleIndex]->handle(req, res, found.second);
+            },
+            "xyz.openbmc_project.User.Manager", "/xyz/openbmc_project/user",
+            "xyz.openbmc_project.User.Manager", "GetUserInfo",
+            req.session->username);
     }
 
     void debugPrint()
diff --git a/include/sessions.hpp b/include/sessions.hpp
index 6e74f25..7c2575d 100644
--- a/include/sessions.hpp
+++ b/include/sessions.hpp
@@ -30,250 +30,6 @@ enum class PersistenceType
     SINGLE_REQUEST // User times out once this request is completed.
 };
 
-constexpr char const* userService = "xyz.openbmc_project.User.Manager";
-constexpr char const* userObjPath = "/xyz/openbmc_project/user";
-constexpr char const* userAttrIface = "xyz.openbmc_project.User.Attributes";
-constexpr char const* dbusPropertiesIface = "org.freedesktop.DBus.Properties";
-
-struct UserRoleMap
-{
-    using GetManagedPropertyType =
-        boost::container::flat_map<std::string,
-                                   std::variant<std::string, bool>>;
-
-    using InterfacesPropertiesType =
-        boost::container::flat_map<std::string, GetManagedPropertyType>;
-
-    using GetManagedObjectsType = std::vector<
-        std::pair<sdbusplus::message::object_path, InterfacesPropertiesType>>;
-
-    static UserRoleMap& getInstance()
-    {
-        static UserRoleMap userRoleMap;
-        return userRoleMap;
-    }
-
-    UserRoleMap(const UserRoleMap&) = delete;
-    UserRoleMap& operator=(const UserRoleMap&) = delete;
-
-    std::string getUserRole(std::string_view name)
-    {
-        auto it = roleMap.find(std::string(name));
-        if (it == roleMap.end())
-        {
-            BMCWEB_LOG_ERROR << "User name " << name
-                             << " is not found in the UserRoleMap.";
-            return "";
-        }
-        return it->second;
-    }
-
-    std::string
-        extractUserRole(const InterfacesPropertiesType& interfacesProperties)
-    {
-        auto iface = interfacesProperties.find(userAttrIface);
-        if (iface == interfacesProperties.end())
-        {
-            return {};
-        }
-
-        auto& properties = iface->second;
-        auto property = properties.find("UserPrivilege");
-        if (property == properties.end())
-        {
-            return {};
-        }
-
-        const std::string* role = std::get_if<std::string>(&property->second);
-        if (role == nullptr)
-        {
-            BMCWEB_LOG_ERROR << "UserPrivilege property value is null";
-            return {};
-        }
-
-        return *role;
-    }
-
-  private:
-    void userAdded(sdbusplus::message::message& m)
-    {
-        sdbusplus::message::object_path objPath;
-        InterfacesPropertiesType interfacesProperties;
-
-        try
-        {
-            m.read(objPath, interfacesProperties);
-        }
-        catch (const sdbusplus::exception::SdBusError& e)
-        {
-            BMCWEB_LOG_ERROR << "Failed to parse user add signal."
-                             << "ERROR=" << e.what()
-                             << "REPLY_SIG=" << m.get_signature();
-            return;
-        }
-        BMCWEB_LOG_DEBUG << "obj path = " << objPath.str;
-
-        std::size_t lastPos = objPath.str.rfind("/");
-        if (lastPos == std::string::npos)
-        {
-            return;
-        };
-
-        std::string name = objPath.str.substr(lastPos + 1);
-        std::string role = this->extractUserRole(interfacesProperties);
-
-        // Insert the newly added user name and the role
-        auto res = roleMap.emplace(name, role);
-        if (res.second == false)
-        {
-            BMCWEB_LOG_ERROR << "Insertion of the user=\"" << name
-                             << "\" in the roleMap failed.";
-            return;
-        }
-    }
-
-    void userRemoved(sdbusplus::message::message& m)
-    {
-        sdbusplus::message::object_path objPath;
-
-        try
-        {
-            m.read(objPath);
-        }
-        catch (const sdbusplus::exception::SdBusError& e)
-        {
-            BMCWEB_LOG_ERROR << "Failed to parse user delete signal.";
-            BMCWEB_LOG_ERROR << "ERROR=" << e.what()
-                             << "REPLY_SIG=" << m.get_signature();
-            return;
-        }
-
-        BMCWEB_LOG_DEBUG << "obj path = " << objPath.str;
-
-        std::size_t lastPos = objPath.str.rfind("/");
-        if (lastPos == std::string::npos)
-        {
-            return;
-        };
-
-        // User name must be atleast 1 char in length.
-        if ((lastPos + 1) >= objPath.str.length())
-        {
-            return;
-        }
-
-        std::string name = objPath.str.substr(lastPos + 1);
-
-        roleMap.erase(name);
-    }
-
-    void userPropertiesChanged(sdbusplus::message::message& m)
-    {
-        std::string interface;
-        GetManagedPropertyType changedProperties;
-        m.read(interface, changedProperties);
-        const std::string path = m.get_path();
-
-        BMCWEB_LOG_DEBUG << "Object Path = \"" << path << "\"";
-
-        std::size_t lastPos = path.rfind("/");
-        if (lastPos == std::string::npos)
-        {
-            return;
-        };
-
-        // User name must be at least 1 char in length.
-        if ((lastPos + 1) == path.length())
-        {
-            return;
-        }
-
-        std::string user = path.substr(lastPos + 1);
-
-        BMCWEB_LOG_DEBUG << "User Name = \"" << user << "\"";
-
-        auto index = changedProperties.find("UserPrivilege");
-        if (index == changedProperties.end())
-        {
-            return;
-        }
-
-        const std::string* role = std::get_if<std::string>(&index->second);
-        if (role == nullptr)
-        {
-            return;
-        }
-        BMCWEB_LOG_DEBUG << "Role = \"" << *role << "\"";
-
-        auto it = roleMap.find(user);
-        if (it == roleMap.end())
-        {
-            BMCWEB_LOG_ERROR << "User Name = \"" << user
-                             << "\" is not found. But, received "
-                                "propertiesChanged signal";
-            return;
-        }
-        it->second = *role;
-    }
-
-    UserRoleMap() :
-        userAddedSignal(
-            *crow::connections::systemBus,
-            sdbusplus::bus::match::rules::interfacesAdded(userObjPath),
-            [this](sdbusplus::message::message& m) {
-                BMCWEB_LOG_DEBUG << "User Added";
-                this->userAdded(m);
-            }),
-        userRemovedSignal(
-            *crow::connections::systemBus,
-            sdbusplus::bus::match::rules::interfacesRemoved(userObjPath),
-            [this](sdbusplus::message::message& m) {
-                BMCWEB_LOG_DEBUG << "User Removed";
-                this->userRemoved(m);
-            }),
-        userPropertiesChangedSignal(
-            *crow::connections::systemBus,
-            sdbusplus::bus::match::rules::path_namespace(userObjPath) +
-                sdbusplus::bus::match::rules::type::signal() +
-                sdbusplus::bus::match::rules::member("PropertiesChanged") +
-                sdbusplus::bus::match::rules::interface(dbusPropertiesIface) +
-                sdbusplus::bus::match::rules::argN(0, userAttrIface),
-            [this](sdbusplus::message::message& m) {
-                BMCWEB_LOG_DEBUG << "Properties Changed";
-                this->userPropertiesChanged(m);
-            })
-    {
-        crow::connections::systemBus->async_method_call(
-            [this](boost::system::error_code ec,
-                   GetManagedObjectsType& managedObjects) {
-                if (ec)
-                {
-                    BMCWEB_LOG_DEBUG << "User manager call failed, ignoring";
-                    return;
-                }
-
-                for (auto& managedObj : managedObjects)
-                {
-                    std::size_t lastPos = managedObj.first.str.rfind("/");
-                    if (lastPos == std::string::npos)
-                    {
-                        continue;
-                    };
-                    std::string name = managedObj.first.str.substr(lastPos + 1);
-                    std::string role = extractUserRole(managedObj.second);
-                    roleMap.emplace(name, role);
-                }
-            },
-            userService, userObjPath, "org.freedesktop.DBus.ObjectManager",
-            "GetManagedObjects");
-    }
-
-    boost::container::flat_map<std::string, std::string> roleMap;
-    sdbusplus::bus::match_t userAddedSignal;
-    sdbusplus::bus::match_t userRemovedSignal;
-    sdbusplus::bus::match_t userPropertiesChangedSignal;
-};
-
 struct UserSession
 {
     std::string uniqueId;
diff --git a/src/webserver_main.cpp b/src/webserver_main.cpp
index a2da120..901c180 100644
--- a/src/webserver_main.cpp
+++ b/src/webserver_main.cpp
@@ -108,10 +108,6 @@ int main(int argc, char** argv)
 
     redfish::RedfishService redfish(app);
 
-    // Keep the user role map hot in memory and
-    // track the changes using match object
-    crow::persistent_data::UserRoleMap::getInstance();
-
     app.run();
     io->run();