asp.net reading barcode PART V in Software

Make QR Code in Software PART V

PART V
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Part V:
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Security
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Greylisting
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Greylisting is a technique similar to SMTP tarpitting However, instead of a delay being introduced only when an SMTP client indulges in inappropriate behavior, all connections are subjected to the greylisting treatment by dropping the connection when a new combination of an SMTP client IP address, sender, and recipient are encountered The logic is that most spammers will not try sending the message again Valid SMTP hosts will retry sending their message After the message is dropped, a greylisting agent adds the triplet (sending IP address + sender + recipient) into a database The next time an SMTP host retries sending the message with the same sender and recipient, the triplet will already exist in the database, resulting in acceptance of the message Most messaging system administrators who use greylisting report a dramatic drop in the levels of spam some reporting a drop as high as 80% to 90% attributed to this technique Like tarpitting, greylisting increases the cost to spammers because each message with a new combination of sending host IP address/sender/recipient needs to be retried If they have not done so already, spammers may find workarounds and adjust to this technique over a period of time Exchange Server 2007 does not ship with native support for greylisting out of the box The Exchange Server 2007 Software Development Kit (SDK) does include the code for a greylisting agent The code needs to be compiled and the compiled agent installed on Exchange Server 2007 Transport servers If you plan to use the agent code provided in the SDK, make sure it is tested in a production environment before you install the compiled agent on production Transport servers
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Managing the Agent Log
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As mentioned earlier in the chapter, Exchange Server 2007 anti-spam agents log actions taken in the agent log, which by default resides in the Exchange Server install path (C:\Program Files\Microsoft\Exchange Server, by default) in \TransportRoles\Logs\ AgentLog Logs are purged after 30 days, or when the size of the AgentLog directory reaches 250MB In Exchange Server 2003 RTM, there are not many configuration options for the agent log itself, except the ability to disable it This is done by modifying the EdgeTransportexe config file located in the \Bin directory in the path where Exchange is installed Exchange Server 2007 SP1 adds the ability to control maximum file and directory size, as well as the maximum age of agent log files The agent log can be parsed using the get-agentlog command It parses the agent logs residing in the default location If agent logs are archived to an alternate location, these can be parsed by adding the location parameter with the path where the archived agent logs reside, as shown in the following command:
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Get-AgentLog Location "Z:\Antispam Agent Logs"
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Get-AgentLog searches all the agent logs residing in the default path (or the path provided using the location parameter) Parsing a large number of agent logs accumulated
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17:
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Anti-Spam
in the path can take a long time The Get-AgentLog command can be constrained to a particular start date and time, and optionally an end date and time:
Get-AgentLog StartDate "1/2/2008" Get-AgentLog StartDate "1/2/2008 7:00 am" EndDate "1/2/2008 2:00 pm"
Here s a sample entry returned by the agent log:
Timestamp : 1/2/2008 12:39:49 AM SessionId : 08C948C83FB951AC IPAddress : 7246133113 MessageId : P1FromAddress : ret@noncornelancom P2FromAddresses : {} Recipients : {foo@yourdomaincom} Agent : Connection Filtering Agent Event : OnRcptCommand Action : RejectCommand SmtpResponse : 550 571 Recipient not authorized, your IP has been found on a block list Reason : BlockListProvider ReasonData : Spamhaus SBL-XBL Diagnostics :
The agent log can be searched using these fields Let s take a look at a few examples To search by sending IP address, use the following command:
Get-AgentLog StartDate "1/2/2008" EndDate "1/3/2008" | where {$_IPAddress eq "7246133113"
To search by sender:
Get-AgentLog StartDate "1/2/2008" EndDate "1/3/2008" | where {$_P1FromAddress like "ret@noncornelancom" or $_P2FromAddress like "ret@noncornelancom"}
To search messages for a particular recipient:
Get-AgentLog StartDate "1/2/2008" EndDate "1/3/2008" | where [$_Recipients like "foo@mydomaincom"}
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