Hacking Exposed: Network Security Secrets and Solutions in Software

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Hacking Exposed: Network Security Secrets and Solutions
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You can create IPSec filters by using the Administrative Tools | Local Security Policy applet (secpolmsc) In the GUI, right-click the IPSec Policies On Local Machine node in the left pane, and then select Manage IP Filter Lists And Filter Actions We actually prefer to use the ipsecpolexe command-line utility for managing IPSec filters It facilitates scripting, and we think it s easier to use than the many-faceted and confusing graphical IPSec policy management utility Ipsecpolexe is available through the Win 2000 Resource Kit and with the Win 2000 Internet Server Security Configuration Tool from http://wwwmicrosoftcom/technet/security/toolsasp The following ipsecpol commands leave only port 80 accessible on a host:
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ipsecpol \\computername -w REG -p "Web" -o ipsecpol \\computername -x -w REG -p "Web" -r "BlockAll" -n BLOCK -f 0+* ipsecpol \\computername -x -w REG -p "Web" -r "OkHTTP" -n PASS -f 0:80+*::TCP
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The last two commands create an IPSec policy called Web containing two filter rules, one called BlockAll that blocks all protocols to and from this host and all other hosts, and a second called OkHTTP that permits traffic on port 80 to and from this host and all others If you want to enable ping or ICMP (which we strongly advise against unless absolutely necessary), you can add this rule to the Web policy:
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ipsecpol \\computername -x -w REG -p "Web" -r "OkICMP" -n PASS -f 0+*::ICMP
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This example sets a policy for all addresses, but you could easily specify a single IP address using the f switch (see Table 6-2) to focus its effects on one interface Port scans against a system configured using the preceding example show only port 80 When the policy is deactivated, all the ports become accessible again A description of each argument used in this example is shown in Table 6-2 (for a complete description of ipsecpol functionality, run ipsecpol - , upon which this table is based)
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-w REG
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Sets ipsecpol in static mode, which writes policy to the store specified (as opposed to the default dynamic mode, which remains in effect only as long as the Policy Agent service remains up; that is, reboot kills it) The REG parameter specifies that policy be written to the Registry and is appropriate for stand-alone web servers (the other option, DS, writes to the directory) Specifies an arbitrary name (WWW, in our example) for this policy If a policy already exists with this name, this rule will be appended to it For example, the rule OkHTTP is appended to the WWW policy in the third line Ipsecpol Parameters Used to Filter Traffic to a Win 2000 Host
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Table 6-2
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6:
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Hacking Windows 2000
r -n BLOCK
Specifies an arbitrary name for the rule, which will replace any existing rules with the same name within this policy When in static mode, the NegotiationPolicyList option can specify three special items: BLOCK, PASS, and INPASS (described next) Ignores the rest of the policies in NegotiationPolicyList and will make all of the filters blocking or drop filters This is the same as selecting the Block radio button in the IPSec management UI Ignores the rest of the policies in NegotiationPolicyList and will make all of the filters pass through filters This is the same as selecting the Permit radio button in the UI FilterList, one or more space-separated IP filters Filter rules take the format called a filterspec: ABCD/mask:port=ABCD/mask:port:IP protocol where Source address is always on the left of the = , and the Destination address is always on the right If you replace the = with a + , two mirrored filters will be created, one in each direction Mask and port are optional If they are omitted, Any port and mask 255255255255 will be used for the filter You can replace ABCD/mask with the following: 0 to indicate the local system address(es) * to indicate any address a DNS name (Note: multiple resolutions are ignored) IP protocol (for example, ICMP ) is optional; if omitted, Any IP protocol is assumed If you indicate an IP protocol, a port must precede it or :: must precede it OPTIONAL Sets the policy active in the LOCAL registry case (note that we use this when specifying our first rule to make the WWW policy active; for some reason, this switch only seems to work if applied at the creation of the first filter of a policy) OPTIONAL Sets the policy inactive in the LOCAL registry case OPTIONAL Will delete the policy specified by p (Note: This will delete all aspects of the specified policy; don t use it if you have other policies pointing to the objects in that policy) Ipsecpol Parameters Used to Filter Traffic to a Win 2000 Host (continued)
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