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HP Host Intrusion Detection System (HIDS) manual Solution C

Models: Host Intrusion Detection System (HIDS)

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Automated Response

Programming Guidelines

int pid;

/* Turn off root privilege but save euid */ if( setresuid(-1, getuid(), geteuid()) == -1) {

perror(“setresuid”);

exit(1);

}

/* Determine if a file modification alert */ if (atoi(argv[1]) == 2) {

/* Determine if the target of the attack is /etc/passwd */ if (strcmp(argv[17],”/etc/passwd”) == 0) {

/* Obtain process id */ pid = atoi(argv[11]); if (pid < 0) {

fprintf(stderr,”Unknown process modified /etc/passwd\n”,pid);

exit(1)

;

}

fprintf(stderr,”Process %d running %s modified /etc/passwd\n”,pid,ar gv[24]);

/* Turn on root privilege */

if( setresuid(-1, 0, -1) == -1) { perror(“setresuid”);

exit(1);

}

/* Kill offending process */

if (kill((pid_t)pid,SIGKILL) == -1) { perror(“kill”);

exit(1);

}

fprintf(stderr,”Killed offending process %d\n”,pid);

/* Turn off root privilege */

if( setresuid(-1, getuid(), geteuid()) == -1) { perror(“setresuid”);

exit(1);

}

}

}

exit(0);

}

Solution C

/opt/ids/response/privC

A setuid-root program with mode 4550 and owned by root:ids

/opt/ids/response/misc

Appendix B

193

Image 205

HP Host Intrusion Detection System (HIDS) manual Solution C

Contents

Edition HP-UX Host Intrusion Detection System Administrator’s GuideManufacturing Part Number J5083-90013 December Government License WarrantyIii TrademarksConventions Contents Schedule Manager Screen System Manager ScreenNetwork Node Screen Host Manager ScreenVii Templates and Alerts Preferences ScreenViii Idsadmin Command Idsagent CommandAutomated Response Agent Conﬁguration FileMessages TroubleshootingHP Software License Original SSLeay License HP Software License Terms Xii Overview Documentation SummaryLoss of Financial Assets Why Do You Need Intrusion Detection?Loss of Intellectual Property Loss of Computing ResourcesHow Are These Threats Realized? Who Are the Perpetrators?Misplaced Trust Malicious CodeExcessive Privilege for Simple Tasks Why Existing Tools Are Only Part of the SolutionBeing Used as a Springboard to Attack the Next Victim FirewallsSecurity Auditing Tools EncryptionWhat Is Intrusion Detection? Where Does Intrusion Detection Fit In?What HP-UX Hids Does What HP-UX Hids Does Not Do Graphic Representation HP-UX Hids ComponentsHP-UX Hids Components How the Components Interact to Detect IntrusionsDetection Templates HP-UX Hids Secure CommunicationsSurveillance Groups Surveillance SchedulesGlossary of HP-UX Hids Terms Intrusion Detection System Intrusion Detection DataKernel NodeVirus System ManagerVulnerability Glossary of HP-UX Hids Terms Chapter Conﬁguration Conﬁguration Required IntroductionOptional Overview of Procedures to Set Up Secure Communications Setting Up the HP-UX Hids Secure CommunicationsScript to Use Where Used End Product Create the X.509 Certiﬁcates$ IDSgenAdminKeys install $ IDSgenAgentCerts Transport the Certiﬁcates TIP$ IDSimportAgentKeys /var/opt/ids/tmp/myhost1.tar.Z myadmin Install the Keys on Each HostStep Conﬁguring a Multihomed Agent System$ nslookup large2 ExampleTo conﬁgure a multihomed administration system Conﬁguring a Multihomed Administration SystemEdit the agent conﬁguration ﬁle for example To conﬁgure a loopback system Conﬁguring a Loopback SystemWorking with NIS Conﬁguring PortsWorking with Firewalls Enabling Over 23 Agents Thread Limits Enabling Large Numbers of AgentsTo change the value of maxthreadproc Select Kernel Conﬁguration Select Conﬁgurable ParametersTo view and change the value of tcpconnrequestmax Enabling Over 20 Inbound RequestsRestricting Permissions Accessing ManpagesRuntime File Permissions Files PermissionsAccessing Manpages Chapter Getting Started Getting Started System Manager AgentsStarting HP-UX Hids for the First Time Set up hosts and run schedulesSee , Host Manager Screen, on Schedule Manager Operations ScreensHost Manager Network NodeSelecting Entries in Lists Basic Screen ActionsSearching Entries Sorting EntriesBasic Screen Actions Chapter System Manager Screen System Manager Screen System Manager Screen Stopping the HP-UX Hids System Manager Starting the HP-UX Hids System ManagerTo start the HP-UX Hids System Manager To stop the HP-UX Hids System ManagerStatus Field Values On the System Manager ScreenStatus Value Description To get the status of agent hosts Getting the Status of Agent HostsOn the System Manager screen To resynchronize agent hosts Resynchronizing Agent HostsTo activate a surveillance schedule on agent hosts Activating a Schedule on Agent HostsChoose the Actions Activate Schedule menu item To stop a surveillance schedule on agent hosts Stopping Schedules on Agent HostsTo start the agent Starting HP-UX Hids AgentsTo halt agents remotely from the System Manager Halting HP-UX Hids AgentsTo halt the agent locally on the agent host Go to Schedule Manager Screen Accessing Other ScreensGo to Host Manager Screen To go to the Schedule Manager screenGo to Preferences Screen Go to Network Node ScreenReturn to System Manager Screen Accessing Other Screens Chapter Schedule Manager Screen Schedule Manager Screen Schedule Manager To create a surveillance schedule Creating a Surveillance ScheduleClosing the Schedule Manager Screen Displaying the Schedule Manager ScreenTo display the Schedule Manager screen To close the Schedule Manager screenCreating a New Surveillance Schedule Conﬁguring Surveillance SchedulesCopying a Surveillance Schedule To create a new surveillance scheduleTo modify a surveillance schedule Modifying a Surveillance ScheduleTo rename a surveillance schedule Renaming a Surveillance ScheduleChoose File Save Selected Schedule As Undoing and Redoing Changes Deleting a Surveillance ScheduleTo delete a surveillance schedule To save a surveillance schedule Saving a Surveillance ScheduleChoose File Save Selected Schedule Creating a New Surveillance Group Conﬁguring Surveillance GroupsCopying a Surveillance Group To create a new surveillance groupTo modify a surveillance group Modifying a Surveillance GroupRename Surveillance Group Dialog Renaming a Surveillance GroupTo rename a surveillance group Saving a Surveillance Group Deleting a Surveillance GroupTo delete a surveillance group Modifying a Property Value In a Template Conﬁguring Detection TemplatesTo change the value of a property in a detection template To add a new value Edit List Dialog11Edit Dialog Edit Suggested Best PracticesSome Template Conﬁguration Guidelines Setting Surveillance Schedule Timetables To specify when a schedule will run Specifying When a Schedule Will RunCanceling Changes See Saving a Surveillance Schedule on Viewing the Source of a Surveillance Schedule Viewing Surveillance Schedule DetailsRefreshing the Details Display To view the source of a surveillance scheduleSaving the Details Display Clearing the Details DisplaySave Dialog To clear the displayPredeﬁned Surveillance Schedules Predeﬁned Surveillance Schedules and GroupsPredeﬁned Surveillance Schedules Host Manager Screen Host Manager Screen Displaying the Host Manager Screen Managing HostsClosing the Host Manager Screen Adding a New Host Manually Adding New HostsAdd Host Dialog To add a new host manuallyAddress ﬁeld Host NameIP Address Name ﬁeld Adding New Hosts from /etc/hostsHost Name and IP Address To add new hosts from /etc/hostsRules for Host Lists Files Adding New Hosts from a FileOpen Dialog To add new hosts from a ﬁleTo modify a host entry Modifying a HostTo delete a host entry Deleting HostsEnabling and Disabling Hosts To enable or disable an agent host for monitoringAdd, modify or delete tags To add a tag Managing TagsTo delete a tag To edit a tagSaving the Host List in the Current File Maintaining Host FilesSaving the Host List in a Different File Using Multiple Host Files Using an Alternate Host List FileMaintaining Host Files Chapter Network Node Screen 100 Opening a Network Node Screen Network Node ScreenClosing a Network Node Screen To display the Network Node screen for an agent host102 Alerts TabHP-UX Hids Alerts What They Mean, What to Do HP-UX Hids Errors What They Mean, What to Do Errors Tab104 Selecting Entries General OperationsSelecting with the Mouse Simple VersionSearching for a String Searching for the Next Unseen EntryFind Dialog Deleting an Entry To delete one or more alerts or errorsMarking Entries as Seen or Unseen To search again108 UnseenNetwork Node screen from the System Manager screen Saving a Log File SetSaving the Current Log File Set Saving a New Log File SetPress Ctrl-A Save Dialog BoxExample Creating a New File Set Example Saving the File Set over Another File SetLog File Rotation Opening a Log File SetOpen Dialog Box 112 Preferences Screen 114 Preferences Screen General Preferences Option Default DescriptionTo choosing Actions Status Poll from the System Manager 116Actions Resync from the System Manager screen Browser Preferences Column Name Default DescriptionAlert Events Preferences 118Column Default Description Name Error Events Preferences120 System Manager SubtabTemplates and Alerts Limitations AlertsProperty Types TemplatesTable A-1 Detection Templates Alert SummaryAttack Detected Alert Alert Severity Detection Template 124 Appendix a 125 Examples Unix Regular Expressions126 Appendix a 127 128 LimitationsType I Pathnames to Not Monitor Template Property Types130 Type II Pathnames/Programs PairsType IV UID Pairs Type III UIDsType VI Time Strings Type V Network Triplets132 Type Viii Scalars Type VII Flags134 Buffer Overﬂow TemplateExecute on Stack Name Type Default ValueTable A-2 Template Properties Table A-3 Execute on Stack Alert Properties136 Table A-4 Unusual Argument Length Alert Properties Unusual Argument Length138 Argument with Non-printable CharacterAppendix a 139 140 Table A-6 Template Properties Race Condition TemplateTable A-7 File Reference Modiﬁcation Alert Properties File Reference Modiﬁcation142 Appendix a 143 Table A-8 Setuid Script Executed Alert Properties Privileged Setuid Script Executed144 Appendix a 145 Table A-9 Template Properties Modiﬁcation of Files/Directories Template146 Properties 148 Table A-10 File Being Modiﬁed Alert Properties File Being Modiﬁed150 Appendix a 151 Table A-11 Template Properties Changes to Log File Template152 Table A-12 Append-Only File Being Modiﬁed Alert Properties Append-Only File Being Modiﬁed154 Table A-13 Template Properties Creation of Setuid File TemplateAlerts generated By this templateTable A-14 Setuid File Created Alert Properties Setuid File Created156 Appendix a 157 Table A-15 Template Properties Creation of World-Writable File Template158 Table A-16 World-writable File Created Alert Properties World-Writable File Created160 Appendix a 161 162 Table A-17 Template Properties Modiﬁcation of Another User’s File TemplateTable A-18 Non-owned File Being Modiﬁed Alert Properties Non-owned File Being Modiﬁed164 Appendix a 165 Limitations 166 Table A-19 Template Properties Login/Logout Template168 Table A-20 Login/Logout Alert Properties Login/LogoutTable A-21 Successful su Detected Alert Properties Successful su Detected170 Appendix a 171 172 Table A-22 Template Properties Repeated Failed Logins TemplateTemplate How this template Table A-23 Failed Login Attempts Alert Properties Failed Login Attempts174 Appendix a 175 Repeated Failed su Attempts Repeated Failed su Commands TemplateTable A-24 Template Properties Table A-25 Repeated Failed Su Attempts Alert PropertiesAppendix a 177 178 Template Conﬁguration SyntaxAppendix a 179 180 Automated Response 182 Response Methods General Guidelines184 Alert Process How Automated Response Works in HP-UX HidsSecurity checks Programming Notes186 Table B-1 Additional Arguments Passed to Response ProgramsAppendix B 187 Name Value Description Table B-3 Environment Variables Set for Response Programs188 Appendix B 189 Writing Perl vs. Shell Response Scripts Programming GuidelinesWriting Privileged Response Programs 190Code Examples Solution aCode for scriptA.sh Code for privA program Solution BCode for PrivB program 192Solution C Code for scriptC.sh script #!/usr/bin/sh Code for privC program194 Sample C Language Program Source Code Sample Response ProgramsSample Shell Script Alert Responses 196 Forwarding InformationAppendix B 197 198 Halting any further attacksAppendix B 199 200 Preservation of evidenceAppendix B 201 202 Restoration of a known good stateHP OpenView Operations Smart Plug-In OVO Enablement in HP-UX Hids204 Idsagent Command 206 Synopsis Options Idsagent Command208 ExampleIdsadmin Command 210 Synopsis Startup Options Idsadmin Command212 CommandsAgent Conﬁguration File 214 Forcing Active Agent to Reread Conﬁguration File Agent Conﬁguration FileGlobal Conﬁguration Name Default ValueTable E-1 Global Conﬁguration Variables 216Kernel Audit Data DSP Data Source Process ConﬁgurationTable E-2 DSP idskernDSP Parameters218 Table E-3 Remote Communication ConﬁgurationCorrelator Conﬁguration Variables 220 Messages 222 Agent Messages Idsagent internal error in handling signature groups Idsagent failed to reopen stderr in append modeIdsagent failed to initialize conﬁguration module Idsagent failed to start groupIdsagent unable to setup Sighup signal handler Idsagent unable to setup Sigchld signal handlerIdsagent unable to setup signal handler Idsagent unable to setup Sigsegv signal handlerIdsagent failed to allocate memory Idsagent error trying to shutdown a processIdsagent failed to create schedule path ﬁlename Idsagent failed to execute correlator corrIdsagent internal error occurred in PMStopGroup Idsagent internal error no correlator in PMStartProcessesIdsagent failed to initialize schedule Idsagent failed to initialize schedule in crontabIdsagent not enough disk space to parse schedule Idsagent not enough disk space to create scheduleIdsagent not enough disk space to save conﬁg ﬁle Idsagent out of process table spaceInternal error unknown state Internal errorUnable to open the response script directory dir System Manager Messages Incomplete or Invalid Entry Data Entry Error Exception while opening ﬁle filename File Save ErrorInvalid Host State Unable to disable host Invalid Property Value value Property Value ErrorOnly one property may be edited at a time Selection Error No more instances of searchstring found Find ErrorSearchstring not found Find Error Select Property to be edited Selection ErrorSelect Surveillance Group to copy Selection Error Select Surveillance Group Name to delete Selection ErrorSelect Surveillance Schedule to copy Selection Error Select Surveillance Schedule to delete Selection ErrorFollowing hosts are in an invalid state for this command Surveillance Schedule not selected Schedule Selection ErrorUnable to Overwrite filename File Save Error 234Unknown IP Address unable to resolve Host Name Unknown Host unable to resolve IP Address IPaddress236 Troubleshooting 238 Appendix G 239 Agent and System Manager cannot communicate with each other Troubleshooting240 $ /usr/sbin/kmtune -q enableidds Agent does not start on system bootTo clean up the IDS message queues Agent needs further troubleshootingAgent host appears to hang and/or you see message disk full 242Agents appear to be stuck in polling status Agent does not start after installationAlert date/time sort seems inconsistent Alerts are not being displayed in the alert browserBuffer overﬂow triggers false positives Idsadmin needs installed agent certiﬁcatesDuplicate alerts appear in System Manager 244IDSgenAdminKeys or idsgui quits early IDScheckInstall fails with a kmtune errorLog ﬁles are ﬁlling up Large ﬁles in /var/opt/idsNo Agent Available 246Schedule Manager timetable screen appears to hang SSH does not perform a clean exit after idsgent is startedSystem Manager does not start after idsgui is started System Manager appears to hang248 Unknown program and arguments in certain alert messages Using HP-UX Hids with IPFilter and SecureShellIPFilter rules for HP-UX Hids 250 How to allow the SecureShell daemon to forward X11 trafﬁcAppendix G 251 252 Appendix H 253 HP Software License254 OpenSSL LicenseAppendix H 255 Original SSLeay License256 HP Software License Terms 258