I3: Maximizing Packet Capture Performance
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Virtualization of the RIOT Operating System
Computer Systems and Telematics — Distributed, Embedded Systems Diploma Thesis Virtualization of the RIOT Operating System Ludwig Ortmann Matr. 3914103 Supervisor: Dr. Emmanuel Baccelli Assisting Supervisor: Prof. Dr.-Ing. Jochen Schiller Institute of Computer Science, Freie Universität Berlin, Germany March 2, 2015 iii I hereby declare to have written this thesis on my own. I have used no other literature and resources than the ones referenced. All text passages that are literal or logical copies from other publications have been marked accordingly. All figures and pictures have been created by me or their sources are referenced accordingly. This thesis has not been submitted in the same or a similar version to any other examination board. Berlin, March 2, 2015 (Ludwig Ortmann) Abstract Abstract Software developers in the growing field of the Internet of Things face many hurdles which arise from the limitations of embedded systems and wireless networking. The employment of hardware and network virtualization promises to allow developers to test and debug hard- ware independent code without being affected by these limitations. This thesis presents RIOT native, a hardware and network emulation implementation for the RIOT operating system, which enables developers to compile and run RIOT as a process in their host operat- ing system. Running the operating system as a process allows for the use of debugging tools and techniques only available on desktop computers otherwise, the integration of common network analysis tools, and the emulation of arbitrary network topologies. By enabling the use of these tools and techniques for the development of software for distributed embedded systems, the hurdles they impose on the development process are significantly reduced. -
TCPDUMP Caution
TCPDUMP q Refer to book ”Open Source Network Administration” m Online sample chapter: http://www.phptr.com/articles/article.asp?p=170902&seqNum=4 q Some tools are not based directly on the data being transmitted on a network, but information related to that data. m For example, network bandwidth values m System logs on network equipment q Sometimes needs to examine the packets themselves. m Diagnose some particularly tricky network problems q Widely used open source tool for directly analyzing packets: tcpdump m http://www.tcpdump.org/ Network Analyzer 1-1 Caution q Before you use tcpdump or other analyzer: m Will be able to see some private data m Consult/research Legal implication first m Respect the privacy of other users Network Analyzer 1-2 1 What Tcpdump can do for you q View the entire data portion of an Ethernet frame or other link layer protocol m An IP packet m An ARP packet m Or any protocol at a higher layer than Ethernet. q Very useful m Tcpdump is to a network administrator like a microscope to a biologist. m Give a very clear picture of a specific part of your network m Can be used when the problem is simply that something is not working properly. Network Analyzer 1-3 What tcpdump can do for you? q Case1 : Web browser can not load pages from a server – it hangs. m Problem with client? Server? Or between? m Run tcpdump while loading • Watch every stage to see the following – DNS query – HTTP request to server – Server respond q Case 2: help debug denial of service attacks. -
Hands-On Network Forensics, FIRST 2015
2015-04-30 WWW.FORSVARSMAKTEN.SE Hands-on Network Forensics Workshop Preparations: 1. Unzip the virtual machine from NetworkForensics_ VirtualBox.zip on your EXTENSIVE USE OF USB thumb drive to your local hard drive COMMAND LINE 2. Start VirtualBox and run the Security Onion VM IN THIS WORKSHOP 3. Log in with: user/password 1 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE Hands-on Network Forensics Erik Hjelmvik, Swedish Armed Forces CERT FIRST 2015, Berlin 2 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE Hands-on Network Forensics Workshop Preparations: 1. Unzip the virtual machine from NetworkForensics_ VirtualBox.zip on your EXTENSIVE USE OF USB thumb drive to your local hard drive COMMAND LINE 2. Start VirtualBox and run the Security Onion VM IN THIS WORKSHOP 3. Log in with: user/password 3 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE ”Password” Ned 4 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE SysAdmin: Homer 5 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE PR /Marketing: Krusty the Clown 6 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE Password Ned AB = pwned.se 7 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE pwned.se Network [INTERNET] | Default Gateway 192.168.0.1 PASSWORD-NED-XP www.pwned.se | 192.168.0.53 192.168.0.2 [TAP]--->Security- | | | Onion -----+------+---------+---------+----------------+------- | | Homer-xubuntu Krustys-PC 192.168.0.51 192.168.0.54 8 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE Security Onion 9 FM CERT 2015-04-30 WWW.FORSVARSMAKTEN.SE Paths (also on Cheat Sheet) • PCAP files: /nsm/sensor_data/securityonion_eth1/dailylogs/ • Argus files: -
Network Intell: Enabling the Non-Expert Analysis of Large Volumes of Intercepted Network Traffic
Chapter 1 NETWORK INTELL: ENABLING THE NON- EXPERT ANALYSIS OF LARGE VOLUMES OF INTERCEPTED NETWORK TRAFFIC Erwin van de Wiel, Mark Scanlon and Nhien-An Le-Khac Abstract In criminal investigations, telecommunication wiretaps have become a common technique used by law enforcement. While phone-based wire- tapping is well documented and the procedure for their execution are well known, the same cannot be said for Internet taps. Lawfully inter- cepted network traffic often contains a lot of encrypted traffic making it increasingly difficult to find useful information inside the traffic cap- tured. The advent of Internet-of-Things further complicates the pro- cess for non-technical investigators. The current level of complexity of intercepted network traffic is close to a point where data cannot be analysed without supervision of a digital investigator with advanced network knowledge. Current investigations focus on analysing all traffic in a chronological manner and are predominately conducted on the data contents of the intercepted traffic. This approach often becomes overly arduous when the amount of data to be analysed becomes very large. In this paper, we propose a novel approach to analyse large amounts of intercepted network traffic based on network metadata. Our approach significantly reduces the duration of the analysis and also produces an arXiv:1712.05727v2 [cs.CR] 27 Jan 2018 insight view of analysing results for the non-technical investigator. We also test our approach with a large sample of network traffic data. Keywords: Network Investigation, Big Data Forensics, Intercepted Network Traffic, Internet tap, Network Metadata Analysis, Non-Technical Investigator. 1. Introduction Lawful interception is a method that is used by the police force in some countries in almost all middle-to high-level criminal investigations. -
Airpcap User's Guide
AirPcap User’s Guide May 2013 © 2013 Riverbed Technology. All rights reserved. Accelerate®, AirPcap®, BlockStream™, Cascade®, Cloud Steelhead®, Granite™, Interceptor®, RiOS®, Riverbed®, Shark®, SkipWare®, Steelhead®, TrafficScript®, TurboCap®, Virtual Steelhead®, Whitewater®, WinPcap®, Wireshark®, and Stingray™ are trademarks or registered trademarks of Riverbed Technology, Inc. in the United States and other countries. Riverbed and any Riverbed product or service name or logo used herein are trademarks of Riverbed Technology. All other trademarks used herein belong to their respective owners. The trademarks and logos displayed herein cannot be used without the prior written consent of Riverbed Technology or their respective owners. Riverbed Technology 199 Fremont Street San Francisco, CA 94105 Tel: +1 415 247 8800 Fax: +1 415 247 8801 www.riverbed.com 712-00090-02 ii Contents The AirPcapProduct Family .................................................................................... 1 A Brief Introduction to 802.11 ................................................................................. 2 Terminology ........................................................................................................ 2 802.11 Standards ................................................................................................. 3 Channels ............................................................................................................. 3 Types of Frames ................................................................................................ -
RIOT: an Open Source Operating System for Low-End Embedded Devices in the Iot Emmanuel Baccelli, Cenk Gundo¨ Gan,˘ Oliver Hahm, Peter Kietzmann, Martine S
This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/JIOT.2018.2815038, IEEE Internet of Things Journal 1 RIOT: an Open Source Operating System for Low-end Embedded Devices in the IoT Emmanuel Baccelli, Cenk Gundo¨ gan,˘ Oliver Hahm, Peter Kietzmann, Martine S. Lenders, Hauke Petersen, Kaspar Schleiser, Thomas C. Schmidt, and Matthias Wahlisch¨ Abstract—As the Internet of Things (IoT) emerges, compact low-end IoT devices. RIOT runs on minimal memory in the operating systems are required on low-end devices to ease devel- order of ≈10kByte, and can run on devices with neither MMU opment and portability of IoT applications. RIOT is a prominent (memory management unit) nor MPU (memory protection free and open source operating system in this space. In this paper, we provide the first comprehensive overview of RIOT. We cover unit). The goal of this paper is to provide an overview of the key components of interest to potential developers and users: RIOT, both from the operating system point of view, and from the kernel, hardware abstraction, and software modularity, both an open source software and ecosystem point of view. conceptually and in practice for various example configurations. We explain operational aspects like system boot-up, timers, power Prior work [28], [29] has surveyed the space of operating management, and the use of networking. Finally, the relevant APIs as exposed by the operating system are discussed along systems for low-end IoT devices. -
Of Mobile Devices: a Survey on Network Traffic Analysis
1 The Dark Side(-Channel) of Mobile Devices: A Survey on Network Traffic Analysis Mauro Conti, Senior Member, IEEE, QianQian Li, Alberto Maragno, and Riccardo Spolaor*, Member, IEEE. Abstract—In recent years, mobile devices (e.g., smartphones elements enable both smartphones and tablets to have the and tablets) have met an increasing commercial success and same functionalities typically offered by laptops and desktop have become a fundamental element of the everyday life for computers. billions of people all around the world. Mobile devices are used not only for traditional communication activities (e.g., voice According to the statistics reported in [1], smartphone calls and messages) but also for more advanced tasks made users were 25:3% of the global population in 2015, and this possible by an enormous amount of multi-purpose applications percentage is expected to grow till 37% in 2020. Similarly, the (e.g., finance, gaming, and shopping). As a result, those devices statistics about tablets reported in [2] indicate a global penetra- generate a significant network traffic (a consistent part of the overall Internet traffic). For this reason, the research community tion of 13:8% in 2015, expected to reach 19:2% in 2020. The has been investigating security and privacy issues that are related driving forces of this tremendous success are the ubiquitous to the network traffic generated by mobile devices, which could Internet connectivity, thanks to the worldwide deployment of be analyzed to obtain information useful for a variety of goals cellular and Wi-Fi networks, and a large number of apps (ranging from fine-grained user profiling to device security and available in the official (and unofficial) marketplaces. -
PF: the Openbsd Packet Filter
PF: The OpenBSD Packet Filter Languages: [en] [de] [es] [fr] [id] [ja] [pl] [up to FAQ] [Next: Getting Started] PF: The OpenBSD Packet Filter Table of Contents ● Basic Configuration ❍ Getting Started ❍ Lists and Macros ❍ Tables ❍ Packet Filtering ❍ Network Address Translation ❍ Traffic Redirection (Port Forwarding) ❍ Shortcuts For Creating Rulesets ● Advanced Configuration ❍ Runtime Options ❍ Scrub (Packet Normalization) ❍ Anchors and Named (Sub) Rulesets ❍ Packet Queueing and Prioritization ❍ Address Pools and Load Balancing ❍ Packet Tagging ● Additional Topics ❍ Logging ❍ Performance ❍ Issues with FTP ❍ Authpf: User Shell for Authenticating Gateways ● Example Rulesets ❍ Example: Firewall for Home or Small Office Packet Filter (from here on referred to as PF) is OpenBSD's system for filtering TCP/IP traffic and doing Network Address Translation. PF is also capable of normalizing and conditioning TCP/IP traffic and providing bandwidth control and packet prioritization. PF has been a part of the GENERIC OpenBSD kernel since OpenBSD 3.0. Previous OpenBSD releases used a different firewall/NAT package which is no longer supported. PF was originally developed by Daniel Hartmeier and is now maintained and developed by Daniel and the rest of the OpenBSD team. This set of documents is intended as a general introduction to the PF system as run on OpenBSD. It is intended to be used as a supplement to the man pages, not as a replacement for them. This document covers all of PF's major features. For a complete and http://www.openbsd.org/faq/pf/index.html (1 of 2) [02/06/2005 14:54:58] PF: The OpenBSD Packet Filter in-depth view of what PF can do, please start by reading the pf(4) man page. -
Introduction to Wireshark
¡ ¢ £ ¤ ¥ £ ¢ ¦ ¢ £ § ¨ ¤ © ¢ ¦ ¥ ¡ ¥ ¤ ¥ ¢ ¡ ¦ © £ £ ¨ ¡ ¥ ¢ ¨ ¡ 3 INTRODUCTION TO WIRESHARK As mentioned in Chapter 1, several packet-sniffing applications are available for performing network analysis, but we’ll focus mostly on Wireshark in this book. This chapter introduces Wireshark. A Brief History of Wireshark Wireshark has a very rich history. Gerald Combs, a computer science gradu- ate of the University of Missouri at Kansas City, originally developed it out of necessity. The first version of Combs’s application, called Ethereal, was released in 1998 under the GNU Public License (GPL). Eight years after releasing Ethereal, Combs left his job to pursue other career opportunities. Unfortunately, his employer at that time had full rights to the Ethereal trademarks, and Combs was unable to reach an agreement that would allow him to control the Ethereal brand. Instead, Combs and the rest of the development team rebranded the project as Wireshark in mid-2006. ¡ ¢ £ ¤ ¥ £ ¢ ¦ ¢ £ § ¨ ¤ © ¢ ¦ ¥ ¡ ¥ ¤ ¥ ¢ ¡ ¦ © £ £ ¨ ¡ ¥ ¢ ¨ ¡ Wireshark has grown dramatically in popularity, and its collaborative development team now boasts more than 500 contributors. The program that exists under the Ethereal name is no longer being developed. The Benefits of Wireshark Wireshark offers several benefits that make it appealing for everyday use. Aimed at both the up-and-coming and the expert packet analyst, it offers a variety of features to entice each. Let’s examine Wireshark according to the criteria defined in Chapter 1 for selecting a packet-sniffing tool. Supported protocols Wireshark excels in the number of protocols that it supports—more than 1,000 as of this writing. These range from common ones like IP and DHCP to more advanced proprietary proto- cols like DNP3 and BitTorrent. -
Tcpdump Basics
TCPdump Basics What we will cover: What is/are TCPdump/WinDump? Why use TCPdump? Installation of TCPdump on Unix/Windows It’s installed, now what? Changing the amount of data collected Reading TCPdump/WinDump Output TCP Flags in TCPdump/WinDump Absolute & Relative Sequence Numbers Dumping TCPdump/WinDump output in hexadecimal format TCPdump ManPage TCPdump is a tool we can use for packet analysis. We will not use ethereal (wireshark) because it does “too much” for us. TCPdump will keep everything “raw” and that’s the way we like it! *note: it is expected that the reader will try out all the TCPdump/WinDump commands listed in the lesson on their own computers as well as the practical exercises. You have to actually run the commands to learn how to use the tool. What is/are TCPdump/WinDump? TCPdump, and its cousin WinDump, is software that allows us to see inside the traffic activity that occurs on a network. TCPdump is a Unix tool used to gather data from the network, decipher the bits, and display the output in a human readable format (granted it does take a little bit of instruction to learn the TCPdump language). Why use TCPdump? Network traffic travels in data packets; each data packet contains the information that it needs to travel across the network. This information is contained in a TCP header. A TCP header will contain the destination and source address, state information, and protocol identifiers. The rest of the packet contains the data that is being sent. Devices that are responsible for routing read the information in these packets and send them to their correct destination. -
BSD Projects IV – BSD Certification • Main Features • Community • Future Directions a (Very) Brief History of BSD
BSD Overview Jim Brown May 24, 2012 BSD Overview - 5/24/2012 - Jim Brown, ISD BSD Overview I – A Brief History of BSD III – Cool Hot Stuff • ATT UCB Partnership • Batteries Included • ATT(USL) Lawsuit • ZFS , Hammer • BSD Family Tree • pf Firewall, pfSense • BSD License • Capsicum • Virtualization Topics • Jails, Xen, etc. • Desktop PC-BSD II – The Core BSD Projects IV – BSD Certification • Main Features • Community • Future Directions A (Very) Brief History of BSD 1971 – ATT cheaply licenses Unix source code to many organizations, including UCB as educational material 1975 – Ken Thompson takes a sabbatical from ATT, brings the latest Unix source on tape to UCB his alma mater to run on a PDP 11 which UCB provided. (Industry/academic partnerships were much more common back then.) Computer Science students (notably Bill Joy and Chuck Haley) at UCB begin to make numerous improvements to Unix and make them available on tape as the “Berkeley Software Distribution” - BSD A (Very) Brief History of BSD Some notable CSRG • 1980 – Computer Science Research Group members (CSRG) forms at UCB with DARPA funding to make many more improvements to Unix - job control, autoreboot, fast filesystem, gigabit address space, Lisp, IPC, sockets, TCP/IP stack + applications, r* utils, machine independence, rewriting almost all ATT code with UCB/CSRG code, including many ports • 1991 – The Networking Release 2 tape is released on the Internet via anon FTP. A 386 port quickly follows by Bill and Lynne Jolitz. The NetBSD group is formed- the first Open Source community entirely on the Internet • 1992 – A commercial version, BSDI (sold for $995, 1-800-ITS-UNIX) draws the ire of USL/ATT. -
Wireshark & Ethereal Network Protocol Analyzer
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