Giao trinh cau hinh ASA Tieng Viet

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn BỘ GIÁO DỤC VÀ ĐÀO TẠO TRƯỜNG ĐẠI HỌC SƯ PHẠM KỸ THUẬT HƯNG YÊN _____________ ______________________ __________________ _________

ĐỒ ÁN 5 NGÀNH: CÔNG NGHỆ THÔNG TIN CHUYÊN NGÀNH: MẠNG VÀ TRUYỀN THÔNG TÊN ĐỀ TÀI: TÌM HIỂU FIREWALL TRÊN CÔNG NGHỆ CISCO VÀ DEMO MỘT SỐ ỨNG DỤNG THỰC TIỄN

Nhóm sinh viên:

Phạm Thị Viên Vũ Tiến Dương

GV hướng dẫn:

Vi Hoài Nam

Hưng yên, tháng 11, năm 2011

NHẬN XÉT CỦA GIÁO VIÊN HƯỚNG DẪN

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. Giáo viên hướng dẫn

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn NHẬN XÉT CỦA GIÁO VIÊN PHẢN BIỆN ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. Giáo viên phản biện

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn

LỜI CẢM ƠN Sau gần 3 tháng nỗ lực tìm hiều và thực hiện, đồ án “ Tìm hiểu Firewall trên công nghệ Cisco và Demo một số ứng dụng thực tiễn” đã được hoàn thành, ngoài sự cố gắng hết mình của bản thân, chúng tôi còn nhận được nhiều sự động viên,khích lệ từ gia đình, thầy cô và bạn bè. Đây là một đề tài khá hay mang tính thiết thực cao. Nhóm chúng tôi đã nghiên cứu và cố gắng thiết kế một hệ thống mạng cho đơn vị hoàn chỉnh nhất bằng hết khả năng của mình. Tuy đã cố gắng hết sức song chắc chắn đề tài này không tránh khỏi những thiết sót. Rất mong nhận được sự thông cảm và chỉ bảo tận tình của các Thầy cô và các bạn. Chúng tôi xin bày tỏ lòng biết ơn chân thành nhất đến Thầy Vi Hoài Nam đã tận tâm chỉ bảo và hướng dẫn tận tình trong suốt thời gian nhóm chúng em thực hiện đề tài này. Chúng tôi cũng xin chân thành cảm ơn quý Thầy cô trong Khoa Công nghệ thông tin, trường Đại học sư phạm kỹ thuật Hưng Yên đã tận tình giảng dạy, hướng dẫn, giúp đỡ và tạo điều kiện cho chúng tôi thực hiện tốt đề tài này. Xin cảm ơn tất cả các bạn bè đã và đang giúp đỡ động viên chúng tôi trong quá trình học tập và hoàn thành đồ án. Mặc dù đã cố gắn hết sức để hoàn thành đồ án này,nhưng chắc chắn sẽ không tránh khỏi những sai sót.Chúng tôi rất mong nhận được sự thông cảm và đóng góp, chỉ bảo tận tận tình tình của quý thầy cô và bạn bè! bè! Hưng Yên, ngày 25, tháng 11 năm 2011 Sinh viên thực hiện: Phạm Thị Viên Vũ Tiến Dương

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn LỜI MỞ ĐẦU Trong thực tế hiện nay bảo mật thông tin đang đóng một vai trò thiết yếu chứ không còn là “thứ yếu” trong mọi hoạt động liên quan đến việc ứng dụng công nghệ thông tin. Tôi muốn nói đến vai trò to lớn của việc ứng dụng CNTT đã và đang diễn ra sôi động, không chỉ thuần túy là những công cụ (Hardware, software), mà thực sự đã được xem như là giải pháp cho nhiều vấn đề. Khởi động từ những năm đầu thập niên 90, với một số ít chuyên gia về CNTT, những hiểu biết còn hạn chế và đưa CNTT ứng dụng trong các hoạt động sản xuất, giao dịch, quản lý còn khá khiêm tốn và chỉ dừng lại ở mức công cụ, và đôi khi tôi còn nhận thấy những công cụ “đắt tiền” này còn gây một số cản trở, không đem lại những hiệu quả thiết thực cho những Tổ chức sử dụng nó. Internet cho phép chúng ta truy cập tới mọi nơi trên thế giới thông qua một số dịch vụ. Ngồi trước máy tính của mình bạn có thể biết được thông tin trên toàn cầu, nhưng cũng chính vì thế mà hệ thống máy tính của bạn có thể bị xâm nhập vào bất kỳ lúc nào mà bạn không hề được biết trước. Do vậy việc bảo vệ hệ thống là một vấn đề chúng ta đáng phải quan tâm. Người ta đã đưa ra khái niệm FireWall để giải quyết vấn đề này. Cũng có rất nhiều kiểu, và loại firewall nhưng Cisco đưa ra công nghệ bảo mật với firewall rất hữu hiệu Để làm rõ các vấn đề này thì đồ án “T ìm hiểu friewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn ” sẽ cho chúng ta cái nhìn sâu hơn về khái niệm, cũng như chức năng, cách thức bảo mật cụ thể của Firewall Cisco. Một lần nữa nhóm tôi xin chân thành cảm ơn thầy Vi Hoài Nam và các thầy cô khoa CNTT đã hướng dẫn nhóm tôi hoàn thành đồ án của mình!

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Đồ án này sẽ giúp cho chúng ta biết được các khái niệm cũng như chức năng Firewall. Giúp ta biết sâu hơn về các chính sách bảo mạt Firewall của Cisco cụ thể như thế nào? Cấu hình chúng ra sao. II. Phương pháp nghiên cứu Đọc kỹ và nắm bắt được các yêu cầu của đồ án đề ra. Phương pháp thiết thiết yếu nhất trong trong đồ án án này đó đó là kỹ năng năng đọc, dịch và hiểu tài liệu Tiếng Anh •

•

•

Đi sâu trong việc tìm kiếm tài liệu và trình bày một cách hợp lý nhất.

Chăm chú lắng nghe và tiếp thu những ý kiến đóng góp của giáo viên hướng dẫn. •

III. Bố cục * Nội dung của đồ án này được chia làm 3 chương như sau: •

•

•

•

•

Chương 1: 1: Ta tìm hiểu về tổng quan Firewall. Chương 2: Các vấn đề bảo mật Chương 3: Tìm hiểu sâu vào tìm hiểu Firewall của Cisco Chương 4: Tổng quan về VPNs Chương 5: Demo một số mô hình ứng dụng trong thực tế

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn

MỤC LỤC LỜI CẢM Ơ N........... ........................ ......................... ........................ ......................... ......................... ......................................... ................................... ...... 4 LỜI MỞ ĐẦU........... ....................... ........................ ....................... ....................... ........................ ........................ .................. ........... .......... .......... .......... ..... 5 MỤC LỤC........... ...................... ....................... ........................ ....................... ....................... ........................ ....................... ................. ........... .......... .......... ..... 7 DANH MỤC CÁC HÌNH VẼ, BẢNG BIỂU........... ....................... ........................ ....................... ....................... .................. .......... .... 10 DANH MỤC CÁC TỪ VIẾT TẮT............ ....................... ....................... ........................ ....................... ....................... ................. .......... .......12 1.1 .1.. KH KHÁI NI NIỆM VỀ FIRE REW WALL........... ...................... ....................... ........................ ....................... ....................... .................. .......... .... 13 1.1.1. Tại sao phải sử dụng một Firewall cho mạng máy tính kết nối Internet?..................... ....................... 13 1.1.2. Sự ra đời của Firewall .......................................................................................................14 ....................................................................................................... 14 1.1.3. Mục đích của Firewall .......................................................................................................15 ....................................................................................................... 15 1.1.4. Các lựa chọn Firewall........................................................................................................ Firewall........................................................................................................ 19

1.1. 1. 1.4. 4.1. 1. Fi Fire rewa wall ll ph ần cứ ng............ ....................... ....................... ........................ ....................... ................. ........... .......... .......19 1.1.4.2. Firewall phần mềm..................... ............................................ .............................................. .............................................. ...................................... ...............20 20

1.2. CHỨC NĂNG CỦA FIREWALL ........... ...................... ....................... ..................... .............. .......... .......... .......... .......... ......... .... 21 1.2.1. Firewall bảo vệ những vấn đề gì? ..................................................................................... 21 1.2.2. Firewall bảo vệ chống lại những vấn đề gì? .................................................................... 21

1.2.2.1. Chống lại việc Hacking ........... ....................... ........................ ....................... ................. .......... ......... .......... ....... .. 21 1.2.2.2. Chống lại việc sửa đổi mã........... ....................... ....................... ................ .......... .......... .......... .......... .......... ..... 21 1.2.2.3. Từ chối các dịch vụ đính kèm............ ....................... ....................... ..................... .............. .......... .......... ..... 22 1.2.2.4. Tấn công trực tiế p........... ...................... ....................... ........................ ....................... ................... ............. .......... .......22

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn 1.4.. PHÂN 1.4 PHÂN LOẠI FIR FIREW EWAL ALLL........... ...................... ....................... ........................ ....................... ................ .......... .......... .......... .......... .......28 1.4.1. Packet Filtering Firewall ..................................................................................................28 .................................................................................................. 28 1.4.2. Application-proxy firewall ................................................................................................30 ................................................................................................ 30

1.5. MỘT SỐ VẤN ĐỀ KHI LỰA CHỌN MỘT FIREWALL ..........................................31 31 1.5.1. Sự cần thiết của Firewall ..................................................................................................31 .................................................................................................. 31 1.5.2. Firewall điều khiển và và bảo vệ gì ?....................... .............................................. ............................................. ............................... ............... ..........31 31

1.6. NHỮNG HẠN CHẾ CỦA FIREWALL........... ....................... ........................ ....................... ....................... ................... .........32 2.1. Nguyên tắc b ảo vệ hệ thống mạng........... ...................... ....................... ........................ ..................... .............. ........ ... 35 2.1.1. Hoạch định hệ thống bảo vệ mạng...................... ............................................. .............................................. ............................... .............. ..........35 35 2.1.2. Mô hình bảo bảo mật....................... .............................................. .............................................. ............................................. ............................ ............ ............ ......... ...36 36 2.1.3. Nâng cao mức độ bảo mật.................... ........................................... .............................................. ............................... .............. ............ ............ ........... .....36 36

2.2. Kiến trúc bảo mật của hệ th ống m ạng........... ....................... ........................ ....................... ................... ............ .... 37 2.2.1. Các mức an toàn thông tin trên mạng mạng..................... ............................................ ...................................... ..................... ............ ............ ........37 2.2.2. Ảnh hưởng của các lỗ hổng mạng....................... .............................................. ............................................. ............................ ............ ........... .....38 38

CHƯƠ NG 3. FIREWALL CISCO........... ....................... ......................... ........................................................ ........................................... 39 3.3 Tổng quan về NAT........... ...................... ....................... ........................ ....................... ....................... ................. .......... .......... ........ ... 53 3.3.1 Địa Địa chỉ Private.................... ........................................... .............................................. .............................................. ...................................... .................... ........... ..........53 53 3.3.2 Nhu cầu cầu của NAT.................... ........................................... .............................................. .............................................. ..................................... .................... ......... ...54 54 3.3.3 Lợi ích của NAT....................... .............................................. .............................................. .............................................. ............................... .............. ............ ........55 3.3.4 Thuật ngữ và định định nghĩa NAT..................... ............................................ .............................................. ................................ .............. ........... .......... ....55 55 3.3.5 Một vài ví dụ điển hình NAT

56

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn 4.2 4. 2 Cá Cácch là làm m việc của IPS PSec ec.......... ...................... ........................ ....................... ....................... ................... ............ .......... ........ ... 111 4.3 Các loại kết nố i:........... ....................... ........................ ....................... ....................... ........................ ....................... ................... ..........111 4.4 H ướng dẫn cấu hình............ ....................... ....................... ........................ ....................... ................ .......... .......... .......... .......... ..... 113 4.4.4 Cấu hình anyconnect webvpn....................... .............................................. .............................................. ............................................. ......................125 125

KẾT LUẬN............ ........................ ....................... ....................... ........................ ....................... ....................... ................... ............ .......... .......... ......... .... 135 TÀI LIỆU THAM KHẢO........... ....................... ....................... ....................... ........................ ....................... ...................... ................ .......... .......137

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DANH MỤC CÁC HÌNH VẼ, BẢNG BIỂU SỐ HIỆU

MÔ TẢ

TRANG

Hình 1.1

Firewall được đặt ở giữa mạng riêng và mạng công cộng

8

Hình 1.2

Mạng gồm có Firewall và các máy chủ

9

Hình 1.3

Sử dụng nhiều Firewall nhằm tăng khả năng bảo mật

10

Hình 1.4

Kiến trúc của hệ thống sử dụng Firewall

14

Hình 1.5

Cấu trúc chung của một hệ thống Firewall

15

Hình 1.6

Kiến trúc Dual - Homed host

16

Hình 1.7

Kiến trúc Screened host

18

Hình 1.8

Kiến trúc Screened Subnet

19

Hình 1.9

Packet filtering firewall

20

Hình 1.10

Circuit level gateway

21

Hình 1.11

Application-proxy firewall

22

Hình 2.1

Các mức an toàn thông tin trên mạng m ạng

27

Hình 2.2

Cấu hình từ chối một m ột host theo standard -accesslist

30

Hình 2.3

Cấu hình từ chối telnet từ subnet

31

Hình 3.15

Ví dụ về chính sách NAT

67

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Hình 3.23

mô hình Active/Standby Stateful Failover

94

Hình 3.24

Mô hình chứng thực của ASA

97

Hình 3.25

Chứng thực bằng Cut-through-Proxy cho kết nối Telnet,FTP,HTTP(S)

99

Hình 3.26 (a) Định tuyến tĩnh

101

Hình 3.27 (b) Định tuyến tĩnh

103

Hình 3.28

Mô hình sử dụng RIP với một mạng nhiều Router

105

Hình 4.1

mô hình site-to-site

110

Hình 4.2

Mô hình Access VPN

111

Hình 4.3

Bước 8 cấu hình client sortware

120

Hình 4.4

cài đặt VPN client

135

Hình 4.5

Lưu cấu hình cài đặt VPN client

121

Hình 4.6

khởi tạo kết nối Remote Access VPN

121

Hình 4.7

Đăng nhập để chứng thực

122

Hình 4.8

Mô hình Active/Standby

123

Hình 4.9

Hoạt động của AnyConnect VPN

125

Hình 4.10

Cấu hình AnyConnect

126

Hình 4.11

Truy cập ASA

132

Hình 4.12 (a) Thiết lập kết nối SSL VPN

133

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CỤM TỪ

VIẾT TẮT

1

Network Interface Controller

NIC

2

Internet Protocol

3

Local Area Network

LAN

4

Demilitarized Zone

DMZ

5

File Transfer Protocol

FTP

7

Open Systems Interconnection

OSI

9

Transmission Control Protocol

TCP

10

Asymmetric Digital Subscriber Line

11

Domain Name System

DNS

12

Internet Security and Acceleration

ISA

13

Virtual Private Network

VPN

IP

ADSL

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CHƯƠNG 1. TỔNG QUAN VỀ FIREWALL

1.1. KHÁI NIỆM VỀ FIREWALL 1.1.1. Tại sao phải sử dụng một Firewall Firewall cho mạng máy tính kết nối Internet? Internet ra đời đã đem lại nhiều lợi ích rất lớn cho con người, nó là một trong những nhân tố hàng đầu góp phần vào sự phát triển nhanh chóng của cả thế giới và có thể nói Internet đã kết nối mọi người tới gần nhau hơn. Chính vì một khả năng kết nối rộng rãi như vậy mà các nguy cơ mất an toàn của mạng máy tính rất lớn. Đó là các nguy cơ bị tấn công của các mạng máy tính, tấn công để lấy dữ liệu, tấn công nhằm mục đích phá hoại làm tê liệt cả một hệ thống máy tính lớn, tấn công thay đổi cơ sở dữ liệu …Trước những nguy cơ đó, vấn đề đảm bảo an toàn cho mạng máy tính trở nên rất cấp thiết và quan trọng hơn bao giờ hết. Các nguy cơ bị tấn công ngày càng nhiều và ngày càng tinh vi hơn, nnguy guy hiểm hơn.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Trên Internet, các các tin tăc̣c̣ sử dụng dụng mã hiểm hiểm đôc,̣c,̣ như là các các virus, sâu và Trojan, để tìm tìm cách cách phát phát hiêṇṇ những những cửa cửa không khóa khóa của môṭṭ máy máy tính tính không được được bảo bảo vê.̣.̣ Môṭṭ tường tường lửa lửa có thể giú p bảo bảo vê ̣ máy máy tính tính khỏi khỏi bị những những hoạt hoạt đông này và các các cuôc̣c̣ tấn tấn công ̣ này ̣ng bảo bảo mâṭṭ khác. khác. Vâỵỵ môṭṭ tin tăc̣c̣ có thể làm làm gì? gì? Tùy Tùy thuôc̣c̣ vào vào bản bản chất chất của của viêc̣c̣ tấn tấn công. Trong khi môṭṭ số chỉ đơn giản giả n là sự quấy quấy rầy rầy với với những những trò đùa đùa nghịch nghịch đơn giản, giản, môṭṭ số khác khác được được tạo tạo ra với với những những ý định định nguy hiểm. hiểm. Những Những loại loại nghiêm trọng trọng hơn này này tìm tìm cách cách xóa xóa thông tin từ máy máy tính, tính, phá hủ hủyy nó, nó, hoăc̣c̣ thâm các mâṭṭ ̣ chí ăn căp thông tin cá nhân, như là các ̣m khẩu khẩu hoăc̣c̣ số thẻ tín tín dụng. dụng. Môṭṭ số tin tă c̣c̣ chỉ thích thích đôṭṭ nhâ p̣ vào vào các các máy máy tính tính dễ bị tấn tấ n công. Các Các virus, sâu và Trojan rất rấ t đáng đáng sợ. sợ. May mắn mắn là có thể giảm giảm nguy cơ lây nhiễm nhiễm bằng bằng cách cách sử dụ dụng ng môṭṭ Firewall. 1.1.2. Sự ra đời của Firewall Thuật ngữ Firewall có nguồn gốc từ một kỹ thuật thiết kế trong xây dựng để ngăn chặn, hạn chế hỏa hoạn. Trong công nghệ mạng thông tin, Firewall là một kỹ thuật được tích hợp vào hệ thống mạng để chống sự truy cập trái phép, nhằm bảo vệ các nguồn thông tin nội bộ và

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Môṭṭ Firewall Internet có thể giú p ngăn chăṇṇ người người ngoài ngoài trên Internet không xâm nhâ p̣ được được vào vào máy máy tính. tính. Môṭṭ Firewall làm làm viêc̣c̣ bằng bằng cách cách kiểm kiểm tra thông tin đến đế n và ra Internet. Nó nhâ ṇṇ dạng dạng và bỏ qua các các thông tin đến đến từ môṭṭ nơi nguy hiểm hiểm hoăc̣c̣ có vẻ nghi ngờ. ngờ. Nếu Nếu bạn bạn cài cài đăṭṭ Firewall của của bạn bạn môṭṭ cách cách thích thích hợ p, các các tin tăc̣c̣ tìm tìm kiếm kiếm các các máy máy tính tính dễ bị tấn tấn công không thể phát phát hiêṇṇ ra máy máy tính. tính. Firewall là một giải pháp dựa trên phần cứng hoặc phần mềm dùng để kiểm tra các dữ liệu. Một lời khuyên là nên sử dụng firewall cho bất kỳ máy tính hay mạng nào có kết nối tới Internet. Đối với kết nối Internet băng thông rộng thì Firewall càng quan trọng, bởi vì đây là loại kết nối thường xuyên bật (always on) nên những tin tặc sẽ có nhiều thời gian hơn khi muốn tìm cách đột nhập vào máy tính. Kết nối băng thông rộng cũng thuận lợi hơn cho tin tặc khi được sử dụng để làm phương tiện tiếp tục tấn công các máy tính khác. 1.1.3. Mục đích của Firewall Với Firewall, người sử dụng có thể yên tâm đang được thực thi quyền giám sát các dữ liệu truyền thông giữa máy tính của họ với các máy tính hay hệ thống khác. Có

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn nghiêm trọng. Kẻ nắm quyền kiểm soát trái phép sau đó có thể sử dụng kết nối Internet của để phát động các cuộc tấn công khác mà không bị lộ tung tích của mình. Firewall sẽ đảm bảo tất cả các dữ liệu đi vào là hợp lệ, ngăn ngừa những người sử dụng bên ngoài đoạt quyền kiểm soát đối với máy tính của bạn. Chức năng kiểm soát các dữ liệu đi ra của Firewall cũng rất quan trọng vì sẽ ngăn ngừa những kẻ xâm nhập trái phép "cấy" "cấy" những những virus virus có hại hại vào máy máy tính tính của để phát động các các cuộc tấn tấn công cửa sau tới những máy tính khác trên mạng m ạng Internet.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Firewall cũng có thể làm được nhiều việc hơn và cũng có nhiều thuận lợi và khó khăn. Thông thường nhà quản trị mạng sử dụng Firewall như một thiết bị đầu nối VPN, máy chủ xác thực hoặc máy chủ DNS. Tuy nhiên như bất kì một thiết bị mạng khác, nhiều dịch vụ hoạt động trên cùng một máy chủ thì các rủi ro càng nhiều .Do đó, một Firewall không nên chạy nhiều dịch vụ. Firewall là lớp bảo vệ thứ hai trong hệ thống mạng, lớp thứ nhất là bộ định tuyến ở mức định tuyến sẽ cho phép hoặc bị từ chối các địa chỉ IP nào đó và phát hiện những gói tin bất bình thường. Firewall xem những cổng nào là được phép hay từ chối. Firewall đôi lúc cũng hữu ích cho những đoạn mạng nhỏ hoặc địa chỉ IP riêng lẻ. Bởi vì bộ định tuyến thường làm việc quá tải, nên việc sử dụng bộ định tuyến để lọc ra bộ định tuyến IP đơn, hoặc một lớp địa chỉ nhỏ có thể tạo ra một tải trọng không cần thiết.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Để bảo vệ và giúp cho các lưu lượng bên trong đoạn mạng các nhà quản lý thường chạy hai bộ Firewall, bộ thứ nhất để bảo vệ toàn bộ mạng, và bộ còn lại để bảo vể các đoạn mạng khác. Nhiều lớp Firewall Firewall cũng cho phép các nhà quản trị an toàn mạng kiểm soát tốt hơn những dòng thông tin, đặc biệt là các cơ sở bên trong và bên ngoài công ty phải xử lý các thông tin nhảy cảm. Các hoạt động trao đổi thông tin có thể cho phép trên phần nào đó của mạng thì có thể bị giới hạn trên những vùng nhạy cảm hơn.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Trong số các công ty cung cấp Firewall phần cứng có thể kể tới Linksys (http://www.linksys.com ) và NetGear (http://www.netgear.com ( http://www.netgear.com). ). Tính năng Firewall phần cứng do các công ty này cung cấp thường được tích hợp sẵn trong các bộ định tuyến dùng cho mạng của các doanh nghiệp nhỏ và mạng gia đình. 1.1.4.2. Firewall phần mềm Nếu không không muốn tốn tiền tiền mua Firewall Firewall phần phần cứng cứng thì bạn có thể sử dụng dụng Firewal Firewalll phần mềm. Về giá cả, Firewall Firewall phần mềm thường không đắt bằng firewall phần cứng, thậm chí một số còn miễn phí (phần mềm Comodo Firewall Pro 3.0, PC Tools Firewall Plus 3.0, ZoneAlarm Firewall 7.1 …) và bạn có thể tải về từ mạng Internet. So với Firewall phần cứng, Firewall phần mềm cho phép linh động hơn, nhất là khi cần đặt lại các thiết lập cho phù hợp hơn với nhu cầu riêng của từng công ty. Chúng

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn 1.2. CHỨC NĂNG CỦA FIREWALL FireWall quyết định những dịch vụ nào từ bên trong được phép truy cập từ bên ngoài, những người nào từ bên ngoài được phép truy cập đến các dịch vụ bên trong, và cả những dịch vụ nào bên ngoài được phép truy cập bởi những người bên trong. 1.2.1. Firewall bảo vệ những vấn đề gì? Bảo vệ dữ liệu: Theo dõi luồng dữ liệu mạng giữa Internet và Intranet. Những thông tin cần được bảo vệ do những yêu cầu sau: - Bảo mật: mật: Một số số chức chức năng năng của của Firewa Firewall ll là là có thể thể cất cất giấu giấu thông thông tin tin mạng mạng tin cậy và nội bộ so với mạng không đáng tin cậy và các mạng bên ngoài khác. Firewall cũng cung cấp một mũi nhọn trung tâm để đảm bảo sự quản lý, rất có lợi khi nguồn nhân lực và tài chính của một tổ chức có giới hạn.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn bảo mật máy tính, những file download download có thể thực thi những quyền quyền theo mục đích của những người dùng trên một số trang website. 1.2.2.3. Từ chối các dịch vụ đính kèm Từ chối dịch vụ là một loại ngắt hoạt động của sự tấn công. Lời đe dọa tới tính liên tục của hệ thống mạng là kết quả từ nhiều phương thức tấn công giống như làm tràn ngập thông tin hay là sự sửa đổi đường đi không được phép. Bởi thuật ngữ làm tràn ngập

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn 1.2.2.7. Lỗi người quản trị hệ thống Ngày nay, nay, trình độ của các hacker ngày ngày càng giỏi giỏi hơn, trong khi đó các hệ thống mạng vẫn còn chậm chạp trong việc xử lý các lỗ hổng của mình. Điều này đòi hỏi người quản trị mạng phải có kiến thức tốt về bảo mật mạng để có thể giữ vững an toàn cho thông tin của hệ thống. Đối với người dùng cá nhân, không thể biết hết các thủ thuật để tự xây dựng cho mình một Firewall, nhưng cũng nên hiểu rõ tầm quan trọng của bảo mật

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Các hệ thống Firewall đều có điểm chung ở các cấu trúc cụ thể như sau:

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn đơn giản. Dual-homed host ở giữa, một bên được kết nối với Internet và bên còn lại nối với mạng nội bộ (LAN). Dual-homed host chỉ có thể cung cấp các dịch vụ bằng cách ủy quyền (proxy) chúng hoặc cho phép users đăng nhập trực tiếp vào Dual-homes host. Mọi giao tiếp từ một host trong mạng nội bộ và host bên ngoài đều bị cấm, Dual-homed host là nơi giao tiếp duy nhất.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Vì thế, Bastion host là host cần phải được duy trì ở chế độ bảo mật cao. Packet Filtering cũng cho phép Bastion host có thể mở kết nối ra bên ngoài. Cấu hình của packet filtering trên screening router như sau : - Cho phép phép tất cả các các host host bên bên trong trong mở kết kết nốt nốt tới host host bên bên ngoài ngoài thông thông qua một số dịch vụ cố định. ất cả các các kết nối nối từ h

ấm nh

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn nat 0 và quy định cụ thể địa chỉ hoặc địa chỉ của các thiết bị.Nếu bạn quy định số lượng địa chỉ mạng cho một địa chỉ local, cũng như ước lượng xấp xỉ số mặt nạ mạng con, thì ta điền số mạng và một mặt nạ mạng con bạn con bạn có thể thay thay đổi đổi địa chỉ chỉ dịch(nhữ dịch(những ng địa địa chỉ inside của interface).Để làm điều đó ta dùng lệnh sau: ciscoasa(config)# nat (inside) 1 0.0.0.0 0.0.0.0 lệnh NAT-ID tương ứng với lệnh l ệnh global. Chú ý rằng ta có thể rút gọn chuỗi 0.0.0.0 0.0.0.0 chỉ thành 0 0. Bạn có thể giới hạn tổng kết nối TCP bằng lện: (max_TCP_conns), và cũng có thể giảm một nửa kết nối TCP: embryonic_conn_limit Bắt đầu từ phiên bản 7.0 bạn có thể giới hạn số lượng tối đa cho một kết nối UDP. Tuy nhiên nếu bạn không cấu hình giới hạn số kết nối cho thiết bị mà đã dùng các chính sách để liên kết với nhau thì bảng conn table vẫn hỗ trợ cho các thiết bị được cho phép Để hiển thị những lệnh nat của bạn gõ lệnh: show run nat command. command. Cách tạo một dải địa chỉ global Chính sách dịch luôn cấu hình giữa một cặp interface, ví dụ như inside và outside, hoặc dmz và outside. Lệnh nat định nghĩa local hoặc interface gốc của một địa chỉ dịch Để định nghĩa đích đến hay interface đầu ra chứa địa chỉ global, ta sử dụng lệnh global như sau: ciscoasa(config)# ciscoasa(config)# global (logical_if_name) NAT_ID {first_global_IP_addr[-last_global_IP_addr] [netmask subnet_mask] | interface} Logical_if_name là tham số miêu tả tên logic của interface. Thông lượng sẽ được dịch và chuyển ra trên interface này. The NAT_ID là tham số cơ bản của lệnh. Đây là địa chỉ global có thể được sử dụng Việc dịch PAT có thể bị b ị xóa khỏi bảng khi không có kết nối tương ứng trong bảng giới hạn thời gian kết nối. Trong khi khi việc dịch NAT thì không nể sử dụng lệnh để điều khiển thời gian (thời gian mặc định hết hạn là 3 giờ) Sử dụng với ACLs

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn nguồn và đích được đưa ra . Ở đây chúng ta đang bàn đến khu vực xác định địa chỉ local dành cho việc dịch. Để giải quyết vấn đề trên, Cisco cho phép bạn liên kết chính sách dịch với một access control list (ACL) – điểu khiển truy cập. Nếu thông lượng tương ứng với một trường hợp cho phép xác định trong ACL thì chính sách tương đương này được sử dụng Đây là cú pháp sử dụng lệnh nat với ACL: ciscoasa(config)# ciscoasa(config)# nat [(logical_if_name)] NAT_ID access-list ACL_ID [tcp] max_TCP_conns [embryonic_conn_limit] [udp max_UDP_conns] [dns] [norandomseq] Dưới đây là 2 ví dụ sử dụng ACLs Ví dụ về dịch địa chỉ Giờ thì bạn đã hiểu về cú pháp của lệnh l ệnh global và lệnh NAT. Hãy cùng hiểu rõ hơn chính sách dịch địa chỉ trên các thiết bị thông qua ví dụ đơn giản sau: Ở hình 3.11, thiết bị sẽ NAT cho bất kì internal internal nào có địa chỉ: 192.168.3.0/24 192.168.3.0/24 và và 192.168.4.0/24 Chính sách cấu hình NAT cho ví dụ này là như sau: ciscoasa(config)# ciscoasa(config)# nat-control ciscoasa(config)# ciscoasa(config)# nat (inside) 1 0.0.0.0 0.0.0.0 ciscoasa(config)# ciscoasa(config)# global (outside) 1 200.200.200.10-200.20 200.200.200.10-200.200.200.254 0.200.254 netmask 255.255.255.0 255.255.255.0 Trong ví dụ này thì địa chỉ được yêu cầu NAT thông qua lệnh nat-control . nat-control . Tất cả những thiết bị bên trong interface sẽ có địa chỉ nguồn được dịch là 200.200.200.0 200.200.200.0 khi khi tồn tại một interface đầu ra. Địa chỉ sẽ được thiết bị chọn để đăng kí một cách tự động.

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Hình 3.11 Ví dụ cấu hình NAT đơn giản Ví dụ đơn giản về cấu hình PAT

Hình 3.12 Ví dụ đơn giản về cấu hình PAT Chúng ta sẽ sử dụng mô hình mạng như hình vẽ trên để minh họa cho ví dụ này Lệnh cấu hình như sau: sau: ciscoasa(config)# ciscoasa(config)# nat-control ciscoasa(config)# ciscoasa(config)# nat (inside) 1 0 0 ciscoasa(config)# ciscoasa(config)# global (outside) 1 interface Đây là một ví dụ về PAT, nơi mà thiết bị đang dùng địa chỉ interface bên ngoài cho PAT.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Ví dụ về cấu hình NAT và PAT Để minh họa cho việc sử dụng cả chính sách NAT và PAT trên một thiết bị, ta sử dụng lệnh sau: ciscoasa(config)# ciscoasa(config)# nat-control ciscoasa(config)# ciscoasa(config)# nat (inside) 1 192.168.3.0 192.168.3.0 255.255.255.0 ciscoasa(config)# ciscoasa(config)# global (outside) 1 200.200.200.1-200.200. 200.200.200.1-200.200.200.125 200.125 netmask 255.255.255.128 ciscoasa(config)# ciscoasa(config)# nat (inside) 2 192.168.4.0 192.168.4.0 255.255.255.0 ciscoasa(config)# ciscoasa(config)# global (outside) 2 200.200.200.126 netmask 255.255.255.255 Trong ví dụ này, thiết thiết bị bên trong sẽ nối NAT và PAT lại với nhau 1, 192.168.3.0/24 được dịch thành 200.200.200.1–125 200.200.200.1–125 (sử dụng NAT) 2, 192.168.4.0/24 192.168.4.0/24 được dịch thành 200.200.200.126 200.200.200.126 (sử (sử dụng PAT)

Hình 3.13 ví dụ về cấu hình PAT và NAT Ví dụ về PAT với 2 địa chỉ global Minh họa cho ta thấy việc sử dụng hai địa chỉ global trên một thiết bị. ở đây ta sẽ dùng lấy mô hình mạng hình 3.11 để cấu hình như sau:

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn netmask 255.255.255.255 ciscoasa(config)# ciscoasa(config)# global (outside) 1 200.200.200.2 200.200.200.2 netmask 255.255.255.255 Lệnh cấu hình này thực hiện PAT trên tất cả các kết nối bên trong bên ngoài bằng cách cá ch sử dụng hai địa chỉ trong lệnh global PAT và xác định NAT Ví dụ sử dụng PAT và xác định NAT Trên một thiết bị.Sử dụng mô hình mạng hình 3.13. Thực thi lệnh PAT cho địa chỉ 192.168.3.0/24 nhưng không không thực hiện việc dịch địa chỉ từ địa chỉ 200.200.200.128/25, 200.200.200.128/25, sau đó các thiết bị đã sẵn sàng public địa chỉ IP. Lệnh cấu hình như sau: ciscoasa(config)# ciscoasa(config)# nat-control ciscoasa(config)# ciscoasa(config)# nat (inside) 0 200.200.200.128 200.200.200.128 255.255.255.128 ciscoasa(config)# ciscoasa(config)# nat (inside) 1 192.168.3.0 192.168.3.0 255.255.255.0 50 25 ciscoasa(config)# ciscoasa(config)# global (outside) 1 200.200.200.1 200.200.200.1 netmask 255.255.255.255

Hình 3.14 Ví dụ cấu hình PAT, không NAT Ở ví dụ trên, sử dụng lệnh PAT khi địa chỉ đi từ bên trong 192.168.3.0/24 192.168.3.0/24 đi qua interface ra ngoài nó sẽ được đ ược dịch thành 200.200.200.128/25. Đó là ví dụ NAT 3interface, còn trong trường hợp với nhiều thiết bị hơn thì việc cấu hình cũng diễn ra

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Hình 3.15 Ví dụ cấu hình NAT với 3 interface ciscoasa(config)# ciscoasa(config)# nat-control ciscoasa(config)# ciscoasa(config)# nat (inside) 1 0.0.0.0 0.0.0.0 ciscoasa(config)# ciscoasa(config)# nat (dmz) 1 192.168.5.0 192.168.5.0 255.255.255.0 ciscoasa(config)# ciscoasa(config)# global (outside) 1 200.200.200.10-200.20 200.200.200.10-200.200.200.254 0.200.254 netmask 255.255.255.0 ciscoasa(config)# ciscoasa(config)# global (dmz) 1 192.168.5.10-192.168.5. 192.168.5.10-192.168.5.254 254 netmask 255.255.255.0 Trong ví dụ này, có ba interface tham gia với địa chỉ dịch lần lượt là: inside, ousite, và dmz. Một sự cố của chính sách dịch địa chỉ là: Inside tới dmz: chính sách này sử dụng lệnh NAT ở bên trong và lệnh global ở dmz ( cả hai đều có NAT_ID 1 ). Bất kì thông lượng nào đi qua từ giao diện inside tới giao diện dmz sẽ được NAT sử dụng khoảng địa chỉ 192.168.5.10 tới 192.168.5.254.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn

Hình 3.15 Ví dụ về chính sách NAT

ciscoasa(config)# ciscoasa(config)# access-list Site_A permit tcp 10.0.1.0 255.255.255.0 host 172.16.10.1 ciscoasa(config)# ciscoasa(config)# nat (inside) 100 access-list Site_A ciscoasa(config)# ciscoasa(config)# global (outside) 100 172.16.1.100 172.16.1.100 netmask 255.255.255.255 ciscoasa(config)# ciscoasa(config)# access-list Site_B permit tcp 10.0.1.0 255.255.255.0 host 172.17.10.2 ciscoasa(config)# ciscoasa(config)# nat (inside) 101 access-list Site_B ciscoasa(config)# ciscoasa(config)# global (outside) 101 172.17.1.88 172.17.1.88

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Câu lệnh cấu hình thiết bị: SOHO(config)# access-list VPN-EXEMPT-NAT permit ip 10.100.10.0 255.255.255.0 10.10.0.0 255.255.0.0 SOHO(config)# nat-control SOHO(config)# SOHO(config)# nat (inside) 0 access-list VPN-EXEMPT-NAT VPN-EXEMPT-NAT SOHO(config)# SOHO(config)# nat (inside) 1 10.100.0.0 255.255.0.0 SOHO(config)# SOHO(config)# global (outside) 1 interface Khi lưu lượng đi qua kênh VPN theo kiểu site-to-site tới công ty, nó không nên được đượ c dịch: Lệnh access-list and nat (inside) 0 thực thi chính sách này. Khi lưu lượng đi từ SOHO tới Internet, nó sẽ dịch sử dụng PAT: Lệnh nat (inside) 1 and global global (outsid (outside) e) 1 thực thi chính sách này.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Đây là cú pháp để tạo một NAT tĩnh với câu lệnh sau: ciscoasa(config)# ciscoasa(config)# static (local_if_name,global_if_n (local_if_name,global_if_name) ame) global_I global_IP_ad P_addr dr local_I local_IP_a P_addr ddr [netmask subnet_mask] [tcp [max_conns [embryonic_conn_limit]] [embryonic_conn_limit]] [udp max_conns [dns] [norandomseq] Tất cả những lệnh làm việc với thiết bị Cisco, lệnh tĩnh là một trong những lệnh mà cấu hình gần tương tự nhau, vì những yêu cầu chung của tham số: local interface, địa chỉ global, và địa chỉ IP của local 

Ví dụ về NAT tĩnh

Để minh họa cho chính sách cấu hình NAT tĩnh. Ta sử dụng mô hình mạng trong hình 3.17 miêu tả chính sáchcấu hình cả NAT tĩnh và động ciscoasa(config)# ciscoasa(config)# nat-control ciscoasa(config)# ciscoasa(config)# static (dmz,outside) 200.200.200.1 200.200.200.1 192.168.5.2 netmask 255.255.255.255 ciscoasa(config)# ciscoasa(config)# static (dmz,outside) 200.200.200.2 200.200.200.2 192.168.5.3 netmask 255.255.255.255 ciscoasa(config)# ciscoasa(config)# static (inside,outside) 200.200.200.3 200.200.200.3 192.168.4.1 192.168.4.1 netmask 255.255.255.255 ciscoasa(config)# ciscoasa(config)# nat (inside) 1 0.0.0.0 0.0.0.0

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Hình 3.17 Ví dụ cấu hình NAT tĩnh Trong ví dụ này, thiết bị có ba giao diện bên trong, bên ngoài, và dmz. Các lệnh tĩnh đầu tiên tạo ra một chính sách dịch NAT tĩnh cho DMZ email server: người sử dụng bên ngoài gửi lưu lượng truy tr uy cập đến 200.200.200.1, sẽ được dịch sang 192.168.5.2 và chuyển tiếp đến dmz. Lệnh thứ hai tạo ra một chính sách NAT tĩnh cho các máy chủ DMZ web: người sử dụng bên ngoài gửi lưu l ưu lượng truy cập đến 200.200.200.2 sẽ được dịch sang 192.168.5.3 và chuyển tiếp đến dmz. Lệnh thứ ba tạo ra một chính sách NAT tĩnh cho các máy FTP_server bên trong:người sử dụng bên ngoài n goài gửi lưu lượng truy cập đến 200.200.200.3 sẽ được dịch sang 192.168.4.1 và chuyển tiếp đến giao diện bên trong . Có hai chính sách dịch dịch bổ sung để truy cập ra bên ngoài ngoài , là khi chúng ta gửi lưu lượng truy cập từ bên trong ra ngoài, các địa chỉ sẽ được dịch bằng NAT khác nhau từ 200.200.200.10 200.200.200.10 đến 200.200.200.254. 200.200.200.254. Ngoài ra, khi người sử dụng bên trong truy cập vào phân đoạn mạng DMZ, các địa chỉ sẽ được dịch thành các địa chỉ có dải từ 192.168.5.10 đến 192.168.5.254 3.4.2 Cấu hình PAT tĩnh

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn [netmask subnet_mask] [tcp [max_TCP_conns [max_TCP_conns [embryonic_conn_limit]] [embryonic_conn_limit]] [udp max_UDP_conns [dns] [norandomseq] Đối với các cổng chuyển hướng, xác định các giao thức IP : UDP hay TCP. Địa chỉ global IP hay địa chỉ IP public mà các bên ngoài sẽ gửi lưu lượng truy cập tới. Thay vì sử dụng địa chỉ này bạn có thể chỉ định các tham số giao diện mà các thiết bị đã đăng kí tên. Số cổng toàn cầu là một số của ứng dụng mà các thiết bị bên ngoài lấy được ví dụ như FTP có số cổng là 21 Local_IP_address là địa chỉ thực tể được đăng kí với các thiết bị bên trong, và local_port_# là số cổng ứng dụng đang lắng nghe trên các thiết bị nội bộ. Các tham số khác đã được nới trước đó trong phần “ Xác định các địa chỉ dịch nội bộ ” Ví dụ về PAT tĩnh Để minh họa cấu hình PAT tĩnh hoặc các chính sách dịch PAR. Ta sử dụng mô hình mạng 3.18. Lệnh sau cấu hình cho PAR

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn ▼ Sử dụng danh sách kiểm soát truy cập (ACL) để lọc lưu lượng truy cập thông qua thiết bị ■ Sử dụng các nhóm đối tượng để đơn giản hóa việc quản lý của ACL ■ Lọc các gói tin ICMP đến vào thiết bị ▲ Khắc phục sự cố kết nối bằng cách sử dụng đánh dấu gói dữ liệu và các tính năng chụp gói 3.5.2 3.5.2 So sánh sánh giữa giữa ACL ACL Route Routerr và Firewa Firewall ll ASA ASA Cisco đang thử sức để di chuyển đến một giao diện dòng lệnh thống nhất trên toàn sản phẩm mạng của nó, nó, mà bạn có thể thấy thấy rõ điều này này với với các lệnh ACL trên các các thiết thiết bị của nó . Phần này trình bày những điểm tương đồng và một vài sự khác biệt giữa các các ACL trên thiết nói chung bị và ACL trên router IOS. Một nhóm các ACL được gán nhãn với 1 chỉ số nhận biết nhóm đó Cả Standard và Extended ACL đều được trang bị trong Firewall ASA Cú pháp của các rule là như nhau Mỗi rule được xử lý theo thứ tự từ trên xuống bắt đầu từ rule đầu tiên Có một rule cuối mỗi danh sách ACL mặc định luôn cấm các traffic Khi thêm một Rule vào thì rule đó mặc định được thêm vào cuối cuối của danh sách Rule

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn 4. Các thiết bị sau sau đó một tuyến đường tra cứu để xác định giao diện xuất cảnh thiết bị cần sử dụng. Điều này là cần thiết để xác định các ACL để xử lý và để thực hiện dịch địa chỉ, nếu được kích hoạt. 5. Giả sử rằng bản dịch địa chỉ đã được cấu hình, hình, các điểm đến thông tin địa chỉ là không được phiên dịch với một lệnh tĩnh hoặc dịch với lệnh nat và toàn cầu. 6. Tại thời điểm này kết nối được thêm vào bảng conn và được theo dõi. 3.5.4 Áp dụng một ACL Standard ACL Giống như IOS Router, Firewall ASA hỗ trợ Standard ACL để lọc packet dựa trên địa chỉ IP. Tuy nhiên với Standard ACL, Firewall không thể sử dụng để lọc traffic vào ra Interface Cú pháp

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Ví dụ bạn cần cho phép truy cập vào Server từ 8h00 am đến 6h00 pm Tạo time ranges

Kiểm tra cấu hình ACL Để liệt kê các câu lệnh trong ACL, bạn có hai lựa chọn. Đầu tiên Show run access-list và show run access-group để hiển thị cấu hình trong running-config ciscoasa(config)# ciscoasa(config)# show access-list [ACL_ID] Nếu không không muốn xem ACL đơn, bạn có thể thể xem toàn bộ các ACL - ciscoasa(config)# ciscoasa(config)# show access-list 3.5.5 Một số ví dụ ASA có hai Interface: VD1 Cho phép tất các các Outbound traffic Hạn chế inbound trafic đối với Internal Server

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn User không được truy cập 192.168.1.0/24 Thiết bị trên 192.168.2.0/24 và 192.168.3.0/24 được cho phép truy cập đến Internet Thiết bị trên 192.168.4.0/24 được truy cập đến đế n 131.108.0.0/16. 140.140.0.0/16 140.140.0.0/16 và 210.210.210.0/24 210.210.210.0/24 ở bên bê n ngoài Internet

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn tin( những thông tin được tải về). Trong trường họp các Hacker muốn tấn công bằng cách tạo ra các applet Java độc hại hoặc ActiveX mà người dùng sẽ tải về để tạo hoặc chạy các ưng dụng đó. Một vấn để của ACLs là một ACL có thể chấp nhận hay từ chối cổng TCP 80, trong đó có bao gồm cả applet Java nói ở trên. Nó không thể lọc chỉ một ứng dụng apple Java được. Tương tự như vậy, ACL cũng có vấn đề khi giao dịch với bộ lọc nội dung các trang web. web. Hãy tưởng tượng bạn có một chính sách nghiêm cám người sử dụng web truy cập vào các trang web xấu , bởi vì thông tin các các trang trang web web đã thay đổi tất cả rồi thế nên bạn vẫn thêm các trang đó vào cấu hình ACLs của mình, vậy quá trình xử lý trên là không thể quản lý được.Một vấn đề hàng đầu của bảo mật là vấn đề tải nội dung trang web chiếm quá trình xử lý băng thông rất mạnh, đặc biệt là khi có nhiều người cung tải một nội dung của một trang web. Có ba giải pháp cho những vấn đề này. Các giải pháp đầu tiên là khả năng các thiết bị lọc trên Java và kịch bản ActiveX được nhúng vào trong các kết nối HTTP. Giải pháp thứ hai cho lọc nội dung cho phép các thiết bị để làm việc với

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Cấu hình lọc Java và ActiveX Về cơ bản bạn chỉ có một phương pháp lọc Java applet trực tiếp trên thiết bị của bạn. Cú pháp của lệnh lệnh này: này: ciscoasa(config)# filter filter java port java port_na _name_o me_or_#[ r_#[-port -port_nam _name_or e_or_#] _#] internal_IP_address subnet_mask

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Như bạn bạn có thể thấy, thấy, lọc kịch bản Activ ActiveX eX không khác so với với lọc Java applet, applet, cả hai hai dễ dàng để thiết lập. 3.6.2 Web content

Một trong những mối quan tâm của nhiều công ty khi kết nối với Internet là các loại thông tin mà nhân viên của họ đang tải về máy tính để bàn của họ.Tuy nhiên có một vài nghiên cứu đã được thực hiện, và trung bình 30-40% lưu lượng truy cập Internet của công ty là mục đích không phục vụ cho việc kinh doanh của họ.

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn về vi phạm chính sách. 5. Nếu kết nối được cho phép, proxy mở các kết nối cần thiết đểtải về nội dung. Nội dung sau đó được truyền lại qua ban đầu của người dùng kết nối và được hiển thị trong trình duyệt web của người dùng. ▲ Thay đổi Proxy Một proxy đổi chia tách ra hai thành phần chính sách: một máy chủ bên ngoài có danh sách các chính sách, và một thiết bị mạng thực hiện các chính sách lưu lượng truy cập

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn kết nối. Quá trình này về cơ bản cho phép đủ thời gian để nội dung chính sách trang web máy chủ gửi lại một hành động vào thiết bị trước khi các máy chủ web bên ngoài trả lời người sử dụng, qua đó cho thấy có rất ít sự chậm trễ trong dòng lưu lượng truy cập của người dùng. Không giống như một proxy ứng dụng, các thiết bị không có proxy kết nối: cho phép họ đi ra và thực thi các chính sách về lưu lượng truy cập trở lại. Hơn thế nữa đây sẽ là CPU và bộ nhớ thân thiện bằng cách sử dụng một proxy ứng ứng dụng thực sự. Tuy nhiên, nếu các nội dung chính sách trang web máy m áy chủ xử lý hàng ngàn yêu cầu, nếu là người dùng kinh nghiệm bạn có thể trì hoãn trong dòng lưu lượng của họ. Cisco hỗ trợ

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn lưu trữ trên bộ nhớ cache web của máy chủ. ▲ Các bộ nhớ cache web máy chủ có thể đăng nhập và báo cáo các yêu cầu web của người sử dụng cho bạn. Cisco đã tạo ra các giao thức, và nó có hai phiên bản: 1 và 2. Một số cải tiến của WCCPv2 bao gồm hỗ trợ cho các giao thức khác ngoài HTTP, multicasting các yêu cầu bộ nhớ cache web của máy máy chủ, chủ, nhiều nhiều bộ nhớ cache cache máy chủ, tải tải phân phân phối phối trong trong nhiều máy chủ bộ nhớ cache, MD5 xác thực của thông tin giữa các redirector và bộ nhớ cache của máy máy chủ web, và nhiều nhiều người người khác. khác. Trong hai phiên phiên bản, các thiết thiết bị

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn xác định phím MD5 được sử dụng để tạo ra và xác nhận chữ ký xác thực MD5

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Sau khi cài đặt VPN Client, bật ứng dụng và chọn “New” để tạo một đối tượng kết nối mới

Hình 4.4 cài đặt VPN client

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Hình 4.6: 4.6: khởi tạo kết nối Remote Access VPN Sau khi khởi tạo kết nối VPN, remote user sẽ được yêu cầu nhập thông tin username/password trên trên màn hình đăng nhập để chứng thực với firewall

Hình 4.7 Đăng nhập để chứng thực Sau khi chứng thực thành công với firewall. Một đường hầm bảo mật m ật Remote Access được thiết lập. l ập. Nếu bạn vào CMD rồi ipconfig /all trên máy tính của remote user, bạn sẽ thấy địa địa chỉ ip thuộc thuộc dải dải 192.168. 192.168.20.0/ 20.0/25 25 được chỉ định tới interface interface VPN ảo. Điều này cho phép remote user có toàn quyền truy cập đến mạng Corporate LAN 4.4.3 Cấu hình khả năng Firewall Cisco ASA Firewall là thành phần quan trọng trong ất cứ hệ thống mạng nào và thường một vài dịch vụ quan trọng trong doanh nghiệp phụ thuộc vào khả năng sẵn sàng của Firewall. Vì lẽ đó tính dự phòng của Firewall phải được tích hợp Trong chương này chúng ta sẽ miêu tả năng chịu lỗi của firewall với chế độ Active/Standby. Đây là cách thức cấu hình phổ biến nhất nh ất trong hầu hết hệ thống mạng. ASA cũng cung cấp chế độ chịu lỗi kiểu Active/Active -

-

Mô hình Active/Standby

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Chức năng chịu lỗi của stateful firewall đẩy các thông tin về trạng thái kết nối từ firewall Active đến firewall Standby. Say đó chức năng chịu lỗi sẽ hoạt động, thông tin của kết như nhau có sẵn tại firewall standby, cái tự động trở thành active mà không ngắt kết nối của bất cứ user nào. Thông tin về tình trạng kết nối được đồng bộ giữa active và standby bao gồm gồm dải địa chỉ global global pool, pool, tình tình trạng trạng kết kết nối và thông thông tin bảng bảng NAT NAT và và tình tình trạng trạng các kết nối TCP/UDP và rất nhiều chi tiết khác

Hình 4.8 4.8 Mô hình Active/Standby Mô hình mạng ở trên chỉ ra cặp firewall giữ chức năng failover theo chế độ Active/Standby. Cổng Interface “inside” được kết vào cùng một Internal Switch và “Outside” kết nối vào cùng một External Switch. Một cable chéo kết kế t nối giữa hai thiết bị Firewall như là LAN Failover Link. Trong suốt quá trình hoạt động bình thường, tất cả các traffic được đẩy thông qua Firewall Active, nơi mà xử lý tất cả các giao tiếp inbound và outbound. Nếu sự kiện Active Firewall bị lỗi (ví dụ như interface bị down hay firewall bị lỗi) lỗi) thì Standby Standby Firewa Firewall ll sẽ sẽ đảm nhiệm nhiệm bằng cách nhận địa chỉ chỉ Ip của Active Active Firewall Firewall để mà tất cả các traffic sẽ tiếp tục được đi qua mà không có sự giám đoạn. Tất các các thông tin về tình trạng kết nối được đồng bộ thông qua một kết nối Lan gọi là LAN Failover Link để cho Stand Standby by Firewall biết được tình trạng của Active Firew Firewall all Yêu cầu Một vài yêu cầu về phần cứng và phần mềm cho cả hai firewall để có thể chạy chức năng failover 

Phải cùng nền tảng hệ điều hành



Phải cùng cấu hình phần cứng



Phải cùng chế độ hoạt đồng (routed hay transparent, single hay multiple context)

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Phải có bản quyền phần mềm để chạy chức năng failover

4.4.4 Cấu hình anyconnect webvpn Trong phần này chúng ta sẽ mô tả chức năng mới VPN được hỗ trợ bởi ASA đó là Anyconnect WebVPN, chức năng này sử dụng SSL và chương trình Java client để tạo một đường hầm cho việc truy cập từ xa cho người dùng. Trước khi đi vào chi tiết của Anyconnect WebVPN WebVPN hãy ôn tập lại kiến thức th ức về công nghệ VPN được hỗ trợ bởi ASA Firewall 4.4.4.1 Tổng quan về công nghệ VPN của ASA Cisco cung cấp một vài phương thức khởi tạo VPN trên ASA nhưng chúng thường được phân loại là là “ IPSec IPSec Based Based VPN VPN ” hoặc “SSL “SSL Based VPN ”. ”. Phân loại đầu tiên sử dụng giao thức IPSec cho việc giao tiếp bảo mật trong khi phân loại thứ hai sử dụng SSL. SSL Based VPN cũng được gọi là WebVPN. Hai loại VPN chung được hỗ trợ bởi ASA được phân chia thành các công công nghệ VPN sau IPSec Based VPNs: Lan-to-Lan IPSec VPN: Được sử dụng để kết nối những mạng LAN ở xa thông qua một kênh truyền không bảo mật (như Internet). Công nghệ này chạy giữa ASA-to-ASA hay ASA-to-Cisco Router Remote Access với IPSec VPN Client: Phần mềm VPN Client được cài đặt trên máy m áy tính cá nhân của người dùng để cung cấp truy cập đến mạng trung tâm. Nó sử dụng giao thức IPSec và cung cấp đầy đủ các kết nối vào hệ thống mạng cho người dụng. SSL Based VPNs (WebVPN): Clientless Mode WebVPN: Đây Đây là phương thức khởi tạo đầu tiên của SSL WebVPN được hỗ trợ bởi ASA phiên bản 7.0 và sau này. Nó giúp người dùng thiết lập kết nối VPN một cách bảo mật sử dụng đường hầm bằng cách sử dụng trình duyệt web. Lợi ích của điều này là không cần ohaanf mềm hay phần cứng. Tuy nhiên chỉ có một vài ứng dụng hạn chế mới có thể truy cập được AnyConnect WebVPN: WebVPN: Client chạy bằng Java được cài đặt trên máy tính cá nhân người dùng cung cấp đường hầm bảo mật SSL đến mạng trung tâm. Cung cấp đầy đủ kết nối (tương tự như IPSec Remote Access). Tất cả các ứng dụng ở mạng trung tâm đểu được truy cập từ xa. So sánh giữa các công nghệ WebVPN

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn ta hãy nhìn vào sự khác biệt giữa hai chế độ WebVPN và chắc chắn rằng bạn sẽ hiểu tại sao chúng ta lại tập trung vào AnyConnect Clientless WebVPN không WebVPN không yêu cầu bất cứ VPN Client nào cài đặt trên máy tính cá nhân n hân của người dùng. Nó chỉ sử dụng một trình duyệt web thông thường. Bằng cách truy cập trên trình duyệt đến địa chỉ http://[ địa chỉ outside của ASA] và chứng thực với firewall và có truy cập đến Web Portal. Mặc dù Web Portal này, user có thể truy cập hạn chế một số ứng dụng mạng nội bộ. Một cách đặc biệt chỉ có các ứng dụng Web nội bộ (HTTP,HTTPs), (HTTP,HTTPs), email Server (POP3,SMTP,IMAP), (POP3,SMTP,IMAP), Windows File chia sẻ, và một số lượng các chính sách nhỏ TCP (Telnet) có thể được truy cập. Như vậy sẽ không có đầy đủ truy cập vào mạng nội bộ bằng việc sử dụng Clientless VPN. AnyConnect AnyConnect WebVPN, WebVPN, mặt khác cung caaos đầy đủ kết nối mạng cho remote user. ASA Firewall làm việc như AnyConnect VPN Server, chỉ định địa chỉ ch ỉ IP đến remote r emote user và cho phép người dùng truy cập hệ thống mạng. Như vậy tất cả các giao thức IP và chức năng ứng dụng thông qua đường hầm VPN mà không có vấn đề gì. Ví dụ, một remote user sau khi chúng thực thành công với AnyConnect VPN có thể sử dụng Remote R emote Desktop và truy cập Windows Terminal Server bên trong mạng nội bộ. Mặc dầu chương trình khách chạy trên Java được yêu cầu cài đặt trên máy tính cá nhân của người dùng, chương trình khách này có thể được cung cấp động cho user từ ASA. Người dùng có thể sử dụng trình duyệt Web để kết nối đến Firewall ASA và download chương trình khách Java về. Chương trình này có dung lượng nhỏ tầm 3MB và được lưu trũ trên bộ nhớ Flash của ASA 4.4.4.2Tổng quan về AnyConnect WebVPN AnyConnect WebVPN WebVPN bảo về dữ liệu ở tầng mạng và các tầng trên (tunnel-mode). Nó cung cấp cùng chức năng truy cập từ xa như Cisco IPSec IPSe c VPN. Có hai phiên bản của tunnel-mode WebVPN WebVPN client được chỉ ra r a như sau:

Ở ASA phiên bản 7.0 đến 7.2, WebVPN Client được gọi là SVC (SSL VPN Client). Từ phiên bản 8.0 8.0 về sau, Client được gọi gọi là AnyCon AnyConnect nect WebVPN WebVPN client. client. Mặc dầu chúng chúng ta sẽ chỉ tập trung vào AnyConnect client, nhưng việc cấu hình cho cả 2 phiên bản client c lient (SVC và AnyConnect ) là như nhau trên ASA.

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Hình 4.9 Hoạt động của AnyConnect VPN Từ mô hình trên, ASA Firewall được cấu hình làm AnyConnect WebVPN Server. Người dùng truy cập từ xa thông qua Internet và địa chỉ IP của máy người dùng là 10.1.1.1. Người dụng đứng sau Router Router có chạy chạy NAT/PA NAT/PAT T và có địa chỉ IP private private được được NAT thành IP Public bởi NAT Router. Khi người dùng từ xa truy cập và chứng thực thành công tới ASA bằng AnyConnect Client, ASA sẽ chỉ định địa chỉ IP từ dải IP đã được định nghĩa trước (như ví dụ trên là dải 192.168.5.1-192.168.5.20). 192.168.5.1-192.168.5.20). Từ mô hình trên, ASA chỉ định địa chỉ IP 192.168.5.1 cho người dùng từ xa. Điều này có nghĩa rằng người dùng được kết nối nố i ảo vào mạng nội bộ b ộ LAN đằng sau Firewall ASA Tổng quan hoạt động được miêu tả ở trên giả sử rằng AnyConnect được cài đặt trên máy tính cá nhân của nngười gười dùng. Chúng ta hãy nhìn những tùy chọn bên dưới để có thể cài đặt AnyConnect Client Có hai cách thức cài đặt AnyConnect cho Client Sử dụng Clientless WebVPN portal Cài đặt bằng tay bởi người dùng

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Từng bước cấu hình AnyConnect Chúng ta sẽ tập trung vào tùy chọn cài đặt tự động AnyConnect. Ví dụ chương trình AnyConnect Client được lưu trữ trên bộ nhớ flash ASA và được tải về bởi người dùng. Mô hình dưới sẽ được sử dụng để mô tả từng bước cấu hình

Hình 4.10 Cấu hình AnyConnect

Bước 1: Lưu trữ file PKG vào bộ nhớ flash trên ASA. Đầu tiên bạn cần phải tải về một trong những file .pkg từ Cisco Website. Ví dụ như file client Windows có định dạng như sau: “anyconnect-win-x.x.xxxx-k9.pkg ”. ”. Để copy file PKG vào bộ nhớ flash:

Gỉa sử rằng chúng ta đã tải về AnyConnect Client trên máy tính có IP: 192.168.1.1. Chúng ta sẽ sử dụng TFTP Server trên máy tính để lưu copy file tới ASA

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Chú ý: Số 1 ở cuối file là thứ tự của file trong bộ nhớ flash. Nó được sử dụng khi bạn có nhiều hơn một file lưu trữ trên bộ nhớ flash (ví dụ AnyConnect client cho Windows và MAC) Bước 3: Loại bỏ traffic của SSL WebVPN khỏi ACL trên Outside Interface. Mặc định WebVPN không được loại bỏ khỏi việc kiểm tra của ACL. Một khi traffic được đóng gói, nó sẽ được kiểm tra bởi Inbound ACL áp dụng trên Outside Interface. Bạn phải cho phép permit permit dữ dữ liệu được đóng gói trong ACL hay sử dụng “ syso “ sysopt pt connec connection tion permit-vp permit-vpnn ”.

Bước 4: Bước này là tùy chọn nhưng thực sự hữu ích. Tất cả các kết nối SSL VPN giữa remote user và ASA chạy HTTPs (cổng 443). Điều này có nghĩa rặng người dùng phải sử dụng “https://[địa chỉ IP public của ASA ” trên trình duyệt. Bởi vì hầu hết người dùng quên https bạn có thể cấu hình chuyển cổng. Điều này có ý nghĩa rằng nếu người dùng kết nối tới cổng 80 ASA sẽ tự động chuyển sang cổng 443

Bước 5: Tạo một dải địa chỉ mạng để ASA chỉ định địa chỉ để người dùng bên ngoài. Từ mô hình

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Bước 7: Tạo Group Policy cho người dùng dùng AnyConnect WebVPN. Group Policy này cho phép bạn tạo tạo riêng riêng rẽ người dùng vào các các nhóm nhóm khác khác nhau nhau với các các thuộc thuộc tình tình khác khác nhau. nhau. Các thuộc tính này có thể được cấu hình như DNS server, split-tunnel, cách chương trình Client Anyconnect WebVP WebVPN N được tải về (tự động hay sau khi chứng thực)

Làm rõ một vài thông số Svc keep-installer {installed | none} : “installed” nghĩa là chương trình Client Cl ient vẫn được cài đặt trong suốt trên máy tính người dùng thậm chí ngắt kết nối. Mặc định chương trình Client sẽ bị xóa sau khi người dùng ngắt kết nối khỏi AnyConnect Svc ask {none | enable [default {webvpn |svc} timeout value]} : Câu lệnh này nói cho ASA cách mà chương trình khách AnyConnect sẽ được tải tả i về máy người dùng như thế nào Svc ask none default webvpn: ASA hiển thị ngay lập tức WebPortal. Đây là cấu hình

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Bước 8: Tạo Tunnel Group. Tunnel Group phải tương tác với Group Policy được cấu cấ u hình ở trên. Nó kết kết hợp Group Group Policy Policy với dải dải địa chỉ IP mà chúng chúng ta đã cấu hình hình sẵn sẵn cho người dùng từ xa Định dạng như sau:

Ví dụ:

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn Bước 9: Tạo tài khoản cục bộ trên ASA sẽ được sử dụng cho việc chứng thực AnyConnect

Cấu hình hoàn chỉnh:

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4.4.5 Thiết lập kết nối AnyConnect WebVPN Truy cập vào ASA bằng địa chỉ Public https://[ outside interface]

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Hình 4.11 (b)Truy (b)Truy cập ASA Thiết lập kết nối SSL VPN

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Hình 4.12(b) Thiết lập kết nối SSL VPN Như vậy vậy là kết nối nối đã được được thiết thiết lập thành công.

CHƯƠNG 5. DEMO ỨNG DỤNG

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn - Lập mô hình hình giả lập lập cho cho một một ứng ứng dụng dụng các chín chínhh sách sách bảo bảo mật mật đó I.2. Vấn đề chưa làm được - Chưa Chưa tìm tìm hiểu hiểu hết hết được được các các kĩ thuật thuật lập lập trìn trìnhh Firew Firewall all.. - Chưa Chưa tiếp tiếp cận được thực thực tế tế một giải giải pháp pháp Firewa Firewall ll nào nào để để đề ra cách cách triể triểnn khai hệ thống chính xác. - Việc Việc triển triển khai khai và và tìm hiểu hiểu chưa chưa có có nhiều nhiều điều điều kiện kiện thực thực tế, tế, nhiều nhiều vấn vấn đề chỉ mới qua các tài liệu. II. HƯỚNG PHÁT TRIỂN CỦA ĐỀ TÀI Trên cơ sở những việc đã làm được và chưa làm được ở trên khi thực hiện đề tài, Nhóm tôi xin xin đưa đưa ra hướng hướng phát triển nhằm từng bước hoàn hoàn thiện thiện đề tài. -

Tìm hiểu thêm thêm các kỹ thuật lập trình trình Firewall Firewall sâu hơn nữa, nữa, cũng như đề

xuất phương án và giải pháp tốt. -

Xây dựng một chương trình Firewall có tính thực tiễn cao, có thể triển khai

được. III. LỜI KẾT Trong quá trình tìm hiểu và làm đồ án nhóm tôi đã nhận được rất nhiều ý kiến

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Tìm hiểu Firewall trên công nghệ Cisco và demo một số ứng dụng thực tiễn

TÀI LIỆU THAM KHẢO Tài liệu tiếng Anh [1] Richard Deal, “Cisco Asa Configuration” Configuration”,, Network professional’s library [2] Harris Andrea Cisco-ASA-5505-Configuration” Cisco Asa 5505 Bonus tutorial (CCNA,CCNP,CCSP) “

[3] [3] Harr Harris is Andr Andrea ea Cisco-ASA-Firewall-Fundam Cisco-ASA-Firewall-Fundamentals-2nd-Ed entals-2nd-Edition” ition” step tep by step tep configuration tutorial (CCNA,CCNP,CCSP) (CCNA,CCNP,CCSP) “

Tài liệu Tiếng Việt [4]. Nguyễn Thị Băng Tâm ,” Bài viết về về Pix Firewall Firewall ” Tài liệu trên Internet

Giao trinh cau hinh ASA Tieng Viet

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