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Table 12-1 E-mail Policy Parameters for the match Command
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Data Applications and Policies
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match Command match header to-fields count gt match invalid-recipients count gt match [not] mime encoding
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Description Specifies the number of To: fields to match on Specifies the number of invalid e-mail recipients (nonexistent e-mail addresses) to match on Specifies the encoding scheme to match on for attached files (7bit, 8bit, base64, binary, others, quoted-printable) Specifies the number of bytes to match on for an attached file Specifies a regular expression to use to match on an attached filename or extension Specifies the length of an e-mail sender s address to match on Specifies a regular expression or regular expression class map to use to match on an e-mail sender s address
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match [not] mime filename length match [not] mime filetype regex match sender-address length gt match [not] sender-address regex
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Table 12-1 E-mail Policy Parameters for the match Command (Continued)
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inspect esmtp command in a layer 3/4 policy map:
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Once you are done with your layer 7 policies, you must associate them with an
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ciscoasa(config)# policy-map L3/4_policy_map_name ciscoasa(config-pmap)# class L3/4_class_map_name ciscoasa(config-pmap-c)# inspect esmtp [L7_policy_map_name]
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SMTP and ESMTP Example Configuration
Let s look at an example to illustrate how to use layer 7 policy maps with e-mail inspection I ll use the following example:
ciscoasa(config)# regex BAD_SENDER1 @abc\com ciscoasa(config)# class-map type regex match-any BAD_SENDERS ciscoasa(config-cmap)# match regex BAD_SENDER1 ciscoasa(config)# policy-map type inspect esmtp L7_EMAIL_MAP
Cisco ASA Configuration
ciscoasa(config-pmap)# match body length gt 35000 ciscoasa(config-pmap-c)# drop-connection log ciscoasa(config-pmap)# match sender-address regex class BAD_SENDERS ciscoasa(config-pmap-c)# drop-connection ciscoasa(config)# access-list email permit tcp any any eq 25 ciscoasa(config)# class-map L3_email_class_map ciscoasa(config-cmap)# match access-list email ciscoasa(config)# policy-map L3_outside_policy ciscoasa(config-pmap)# class L3_email_class_map ciscoasa(config-pmap-c)# inspect esmtp L7_EMAIL_MAP ciscoasa(config)# service-policy L3_outside_policy interface outside
In this example, a regular expression ( abccom ) is referenced in a regular expression class map The layer 7 ESMTP policy map (L7_EMAIL_MAP) will drop any e-mails that have a body greater than 35,000 characters or an e-mail coming from abccom A layer 3/4 class map (L3_email_class_map) was created that looks for any inbound TCP port 25 connection A layer 3/4 policy map (L3_outside_policy) is created to do inspection of ESMTP, qualifying it with the layer 7 policy map This is activated on the outside interface of the appliance
FTP INSPECTION
FTP is one of the oldest TCP/IP applications and was designed to move files between different networked computers The following sections will discuss how FTP connections are built between computers, why application inspection is necessary for FTP, the inspection features for FTP, and how to configure application layer inspection for FTP
FTP Operation
FTP, interestingly enough, is unlike normal connections such as telnet and e-mail FTP actually uses two connections one is a command connection (sometimes called a control connection) that the user uses to access the server and enter FTP commands, and the other connection is used for the actual transfer of data, including files FTP supports two different modes standard (or active) and passive and based on the mode, the setup of two connections and transfer of data is slightly different The next two sections explain these two FTP modes
Standard Mode
To better help you understand how connections are set up with standard FTP, let s use the top part of Figure 12-2 When a user wants to initiate an FTP connection, the user sets up a control connection first The user uses the control connection to execute commands, like get and put When the user device opens a control connection, it chooses a free source port number greater than 1023 and uses a destination port number of 21
12:
Data Applications and Policies
Standard FTP TCP Port => 1024 TCP Port => 1024 Standard FTP Client TCP Port => 1024 TCP Port => 1024 Passive FTP Client Passive FTP TCP Port = 21 TCP Port => 1024 FTP Server TCP Port = 21 TCP Port = 20 FTP Server
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