虽然是和上一篇一起看的，以防混淆我还是分开来写吧
另：大佬们不给事情做真的让我很心痛啊/(ㄒoㄒ)/~~
今天主要讲的是第三部分，SIEM的工具
PART III SIEM Tools
CHAPTER 8 AlienVault OSSIM Implementation
OSSIM：Open Source Security Information Management
The concept of OSSIM is simple—don’t reinvent the wheel
some open source tools：
- Snort：the premier open source IDS available today
- OpenVAS：a General Public Licensed (GPL) version of Nessus, a popular open source vulnerability scanning tool，provide vulnerability scans of network assets and add that valuable information to the OSSIM database
- Ntop：a popular open source network traffic–monitoring tool
- Nagios：a popular open source network device–monitoring software tool
- PADS：The Passive Asset Detection System (PADS) is a unique tool（sniffer）
- P0f：passive operating system fingerprinting (discovery of operating system type and version)
- OCS-NG：This tool provides an automated way to keep track of what you have and provides the security analyst with that information as needed.
- OSSEC：an open source host-based intrusion detection system (HIDS)（protect OSSIM itself）
- OSVDB：database
- NFSen/NFDump：an important artifact of network traffic and is extremely valuable in the correlation process
- Inprotect：a web-based interface for Nessus, OpenVAS, and NMAP
Functionality：
Detect：pattern based (signature) and anomaly based（事实上就是特征检测和异常检测，后者可以有效的识别新的攻击模式，而前者不行）
Monitor：
Network Monitoring：
- Network usage information
- Service activity information
- Real-time session monitoring
Availability Monitoring：DoS attackers
Customized System Monitoring：自定义
Scan：OpenVAS
Inventory：点清楚我们到底有些什么，才能知道我们会失去什么
Collect：与前面一致
Risk Assessment：A measure of the potential Impact of a Threat on Assets given the Probability that it will occur.
- Asset value (how much does it cost if compromised?)
- Threat represented by the event (how much damage can be done to the asset?)
- The probability that the event will occur (or get past mitigating factors)
Correlate： The most important aspect of any SIEM tool is the correlation engine.
false positives (false alarms) and false negatives(where intrusions go unnoticed)这个概念我们下一章再聊
- Logical Correlation： rules
- Inventory Correlation： 不太可能出现的情况
- Cross Correlation：a cross-check between IDS data and vulnerability data
Respond、Manage、Report、Measure
Design：
Architecture：这就是实际上的SIEM的整个架构
Sensor：
- Serve as a security detector by performing pattern-based or anomaly intrusion detection
- Serve as a network vulnerability scanner
- Perform network monitoring
Management Server：
- Frameworkd, which serves as a daemon that controls other components
- OSSIM server, which processes the events received from sensors
Database：需购买专业版- -
Frontend：interface
这一章后面的内容就是关于如何安装与使用（下一章），有需要的朋友可以详细阅读Security Information and Event Management (SIEM) Implementation