forked from extern/shorewall_code
06dc3cf91e
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@3046 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
624 lines
23 KiB
Plaintext
Executable File
624 lines
23 KiB
Plaintext
Executable File
Shorewall 3.0.2
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Problems Corrected in 3.0.2
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1) A couple of typos in the one-interface sample configuration have
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been corrected.
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2) The 3.0.1 version of Shorewall was incompatible with old versions of
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the Linux kernel (2.4.7 for example). The new code ignores errors
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produced when Shorewall 3.x is run on these ancient kernels.
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Problems Corrected in 3.0.1
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1) If the previous firewall configuration included a policy other than
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ACCEPT in the nat, mangle or raw tables then Shorewall would not set
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the policy to ACCEPT. This could result in a ruleset that rejected or
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dropped all traffic.
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2) The Makefile was broken such that 'make' didn't always work correctly.
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3) If the SOURCE or DEST column in a macro body was non-empty and a dash
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("-") appeared in the corresponding column of an invocation of that
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macro, then an invalid rule was generated.
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4) The comments in the /etc/shorewall/blacklist file have been updated to
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clarify that the PORTS column refers to destination port number/service
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names.
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5) When CLAMPMSS is set to a value other than "No" and FASTACCEPT=Yes, the
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order of the rules generated was incorrect causing RELATED TCP connections
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to not have CLAMPMSS applied.
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New Features in 3.0.1
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1) To make the macro facility more flexible, Shorewall now examines the
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contents of the SOURCE and DEST columns in both the macro body and in
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the invocation and tries to create the intended rule. If the value in
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the invocation appears to be an address (IP or MAC) or the name of an
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ipset, then it is placed after the value in the macro body. Otherwise,
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it is placed before the value in the macro body.
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Example 1:
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/etc/shorewall/macro.foo:
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PARAM - 192.168.1.5 tcp http
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/etc/shorewallrules:
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foo/ACCEPT net loc
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Effective rule:
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ACCEPT net loc:192.168.1.5 tcp http
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Example 2:
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/etc/shorewall/macro.bar:
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PARAM net loc tcp http
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/etc/shorewall/rules:
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bar/ACCEPT - 192.168.1.5
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Effective rule:
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ACCEPT net loc:192.168.1.5 tcp http
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Migration Considerations:
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1) The "monitor" command has been eliminated.
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2) The "DISPLAY" and "COMMENTS" columns in the /etc/shorewall/zones
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file have been removed and have been replaced by the former
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columns of the /etc/shorewall/ipsec file. The latter file has been
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removed.
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Additionally the FW option in shorewall.conf has been deprecated and
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is no longer set to 'fw' by default. New users are expected to
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define the firewall zone in /etc/shorewall/zones.
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Adhering to the principle of least astonishment, the old
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/etc/shorewall/ipsec file will continue to be supported. A new
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IPSECFILE variable in /etc/shorewall/shorewall.conf determines the
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name of the file that Shorewall looks in for IPSEC information. If
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that variable is not set or is set to the empty value then
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IPSECFILE=ipsec is assumed. So if you simply upgrade and don't do
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something idiotic like replace your current shorewall.conf file with
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the new one, your old configuration will continue to work. A dummy
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'ipsec' file is included in the release so that your package manager
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(e.g., rpm) won't remove your existing file.
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The shorewall.conf file included in this release sets
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IPSECFILE=zones so that new users are expected to use the new zone
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file format.
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As a result, the columns in the /etc/shorewall/zones file
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are now as follows:
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ZONE Short name of the zone (5 Characters or less in
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length). The names "all" and "none" are
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reserved and may not be used as zone names.
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Where a zone is nested in one or more other
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zones, you may follow the (sub)zone name by ":"
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and a comma-separated list of the parent
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zones. The parent zones must have been defined
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in earlier records in this file.
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Example:
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#ZONE TYPE OPTIONS
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a ipv4
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b ipv4
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c:a,b ipv4
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Currently, Shorewall uses this information only
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to reorder the zone list so that parent zones
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appear after their sub zones in the list. In the
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future, Shorewall may make more extensive use
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of that information.
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TYPE ipv4 - This is the standard Shorewall zone type and is
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the default if the column is left empty or if
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it is entered as "-". Communication with some
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zone hosts may be encrypted. Encrypted hosts
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are designated using the 'ipsec' option in
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/etc/shorewall/hosts.
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ipsec - Communication with all zone hosts is encrypted
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Your kernel and iptables must include policy
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match support.
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firewall
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- Designates the firewall itself. You must have
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exactly one 'firewall' zone. No options are
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permitted with a 'firewall' zone.
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OPTIONS, A comma-separated list of options as
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IN OPTIONS, follows:
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OUT OPTIONS
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reqid=<number> where <number> is
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specified using setkey(8) using the
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'unique:<number> option for the SPD
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level.
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spi=<number> where <number> is the SPI
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of the SA used to encrypt/decrypt
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packets.
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proto=ah|esp|ipcomp
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mss=<number> (sets the MSS field in TCP
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packets)
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mode=transport|tunnel
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tunnel-src=<address>[/<mask>] (only
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available with mode=tunnel)
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tunnel-dst=<address>[/<mask>] (only
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available with mode=tunnel)
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strict Means that packets must match
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all rules.
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next Separates rules; can only be
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used with strict..
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Example:
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mode=transport,reqid=44
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The options in the OPTIONS column are applied to both
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incoming and outgoing traffic. The IN OPTIONS are
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applied to incoming traffic (in addition to OPTIONS)
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and the OUT OPTIONS are applied to outgoing traffic.
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If you wish to leave a column empty but need to make an
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entry in a following column, use "-".
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THE ORDER OF THE ENTRIES IN THIS FILE IS IMPORTANT IF YOU HAVE
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NESTED OR OVERLAPPING ZONES DEFINED THROUGH /etc/shorewall/hosts.
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3) The DROPINVALID option has been removed from shorewall.conf. The
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behavior will be as if DROPINVALID=No had been specified. If you
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wish to drop invalid state packets, use the dropInvalid built-in
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action.
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4) The 'nobogons' interface and hosts option as well as the
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BOGON_LOG_LEVEL option have been eliminated.
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5) Most of the standard actions have been replaced by parametrized
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macros (see below). So for example, the action.AllowSMTP and
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action.DropSMTP have been removed an a parametrized macro
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macro.SMTP has been added to replace them.
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In order that current users don't have to immediately update their
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rules and user-defined actions, Shorewall can substitute an
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invocation of the a new macro for an existing invocation of one of
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the old actions. So if your rules file calls AllowSMTP, Shorewall
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will replace that call with SMTP/ACCEPT. Because this substitution
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is expensive, it is conditional based on the setting of
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MAPOLDACTIONS in shorewall.conf. If this option is set to YES or if
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it is not set (such as if you are using your old shorewall.conf
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file) then Shorewall will perform the substitution. Once you have
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converted to use the new macros, you can set MAPOLDACTIONS=No and
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invocations of those actions will go much quicker during 'shorewall
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[re]start'.
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6) The STATEDIR variable in /etc/shorewall/shorewall.conf has been
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removed. STATEDIR is now fixed at /var/lib/shorewall. If you have
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previously set STATEDIR to another directory, please copy the files
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from that directory to /var/lib/shorewall/ before [re]starting
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Shorewall after the upgrade to this version.
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7) The "shorewall status" command now just gives the status of
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Shorewall (started or not-started). The previous status command has
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been renamed "dump". The command also shows the state relative to the
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state diagram at
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http://shorewall.net/starting_and_stopping_shorewall.htm. In
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addition to the state, the time and date at which that state was
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entered is shown.
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Note that at least one "shorewall [re]start" must be issued after
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upgrading to this release before "shorewall status" will show
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anything but "Unknown" for the state.
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8) The "shorewall forget" command now removes the dynamic blacklist
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save file (/var/lib/shorewall/save).
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9) In previous versions of Shorewall, the rules generated by entries in
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/etc/shorewall/tunnels preceded those rules generated by entries in
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/etc/shorewall/rules. Beginning with this release, the rules
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generated by entries in the tunnels file will appear *AFTER* the
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rules generated by the rules file. This may cause you problems if
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you have REJECT, DENY or CONTINUE rules in your rules file that
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would cause the tunnel transport packets to not reach the rules that
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ACCEPT them. See http://www.shorewall.net/VPNBasics.html for
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information on the rules generated by entries in the tunnels file.
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10) The NEWNOTSYN and LOGNEWNOTSYN options in shorewall.conf have been
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removed as have the 'newnotsyn' options in /etc/shorewall/interfaces
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and /etc/shorewall/hosts.
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TCP new-not-syn packets may be blocked using the 'dropNotSyn' or
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'rejNotSyn' built-in actions.
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Example: Reject all new-not-syn packets from the net and log them at
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the 'info' level.
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#ACTION SOURCE DEST PROTO
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SECTION NEW
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rejNotSyn:info net all tcp
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Note that the rule is added at the front of the NEW section of the
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rules file.
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11) A new value is defined for the TC_ENABLED option in shorewall.conf to
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enable the built-in tc4shorewall traffic shaper. If you set
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TC_ENABLED=internal then tc4shorewall will be used. If the option is
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set to Yes then Shorewall will continue to look for a 'tcstart' script.
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New Features in Shorewall 3.0.*
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1) Error and warning messages are made easier to spot by using
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capitalization (e.g., ERROR: and WARNING:).
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2) A new option 'critical' has been added to
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/etc/shorewall/routestopped. This option can be used to enable
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communication with a host or set of hosts during the entire
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"shorewall [re]start/stop" process. Listing a host with this option
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differs from listing it without the option in several ways:
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a) The option only affect traffic between the listed host(s) and the
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firewall itself.
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b) If there are any entries with 'critical', the firewall
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will be completely opened briefly during start, restart and stop but
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there will be no chance of any packets to/from the listed host(s)
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being dropped or rejected.
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Possible uses for this option are:
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a) Root file system is NFS mounted. You will want to list the NFS server
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in the 'critical' option.
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b) You are running Shorewall in a Crossbeam environment
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(www.crossbeam.com). You will want to list the Crossbeam interface
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in this option
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3) A new 'macro' feature has been added.
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Macros are very similar to actions and can be used in similar
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ways. The differences between actions and macros are as follows:
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a) An action creates a separate chain with the same name as the
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action (when logging is specified on the invocation of an action,
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a chain beginning with "%" followed by the name of the action and
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possibly followed by a number is created). When a macro is
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invoked, it is expanded in-line and no new chain is created.
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b) An action may be specified as the default action for a policy;
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macros cannot be specified this way.
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c) Actions must be listed in either /usr/share/shorewall/actions.std
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or in /etc/shorewall/actions. Macros are defined simply by
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placing their definition file in the CONFIG_PATH.
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d) Actions are defined in a file with a name beginning with
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"action." and followed by the name of the action. Macro files are
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defined in a file with a name beginning with "macro.".
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e) Actions may invoke other actions. Macros may not directly invoke
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other macros although they may invoke other macros indirectly
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through an action.
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f) DNAT[-] and REDIRECT[-] rules may not appear in an action. They
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are allowed in a macro with the restriction that the a macro
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containing one of these rules may not be invoked from an action.
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g) The values specified in the various columns when you invoke a
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macro are substituted in the corresponding column in each rule in
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the macro. The first three columns get special treatment:
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ACTION If you code PARAM as the action in a macro then
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when you invoke the macro, you can include the
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name of the macro followed by a slash ("/") and
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an ACTION (either built-in or user-defined. All
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instances of PARAM in the body of the macro will be
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replaced with the ACTION.
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Any logging applied when the macro is invoked is
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applied following the same rules as for actions.
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SOURCE and
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DEST If the rule in the macro file specifies a value and
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the invocation of the rule also specifies a value then
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the value in the invocation is appended to the value
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in the rule using ":" as a separator.
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Example:
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/etc/shorewall/macro.SMTP
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PARAM - loc tcp 25
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/etc/shorewall/rules:
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SMTP/DNAT:info net 192.168.1.5
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Would be equivalent to the following in the rules file:
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DNAT:info net loc:192.168.1.5 tcp 25
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Rest Any value in the invocation replaces the value in the
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rule in the macro.
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One additional restriction applies to the mixing of macros and
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actions. Macros that are invoked from actions cannot themselves
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invoke other actions.
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4) If you have 'make' installed on your firewall, then when you use
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the '-f' option to 'shorewall start' (as happens when you reboot),
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if your /etc/shorewall/ directory contains files that were modified
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after Shorewall was last restarted then Shorewall is started using
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the config files rather than using the saved configuration.
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5) The 'arp_ignore' option has been added to /etc/shorewall/interfaces
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entries. This option sets
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/proc/sys/net/ipv4/conf/<interface>/arp_ignore. By default, the
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option sets the value to 1. You can also write arp_ignore=<value>
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where value is one of the following:
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1 - reply only if the target IP address is local address
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configured on the incoming interface
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2 - reply only if the target IP address is local address
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configured on the incoming interface and both with the sender's
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IP address are part from same subnet on this interface
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3 - do not reply for local addresses configured with scope
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host, only resolutions for global and link addresses are
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replied
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4-7 - reserved
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8 - do not reply for all local addresses
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WARNING -- DO NOT SPECIFY arp_ignore FOR ANY INTERFACE INVOLVED IN
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PROXY ARP.
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6) In /etc/shorewall/rules, "all+" in the SOURCE or DEST column works
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like "all" but also includes intrazone traffic. So the rule:
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ACCEPT loc all+ tcp 22
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would allow SSH traffic from loc->loc whereas
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ACCEPT loc all tcp 22
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does not.
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7) A new FASTACCEPT option has been added to shorewall.conf.
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Normally, Shorewall defers accepting ESTABLISHED/RELATED packets
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until these packets reach the chain in which the original connection
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was accepted. So for packets going from the 'loc' zone to the 'net'
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zone, ESTABLISHED/RELATED packets are ACCEPTED in the 'loc2net'
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chain.
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If you set FASTACCEPT=Yes, then ESTABLISHED/RELEATED packets are
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accepted early in the INPUT, FORWARD and OUTPUT chains. If you set
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FASTACCEPT=Yes then you may not include rules in the ESTABLISHED or
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RELATED sections of /etc/shorewall/rules.
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8) Shorewall now generates an error if the 'norfc1918' option is
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specified for an interface with an RFC 1918 address.
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9) You may now specify "!" followed by a list of addresses in the
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SOURCE and DEST columns of entries in /etc/shorewall/rules,
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/etc/shorewall/tcrules and in action files and Shorewall will
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generate the rule that you expect.
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Example 1 (/etc/shorewall/rules):
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#ACTION SOURCE DEST PROTO DEST PORT(S)
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ACCEPT loc:!192.168.1.0/24,10.0.0.0/8 net tcp 80
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That rule would allow loc->net HTTP access except for the local
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networks 192.168.1.0/24 and 10.0.0.0/8.
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Example 2 (/etc/shorewall/rules):
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#ACTION SOURCE DEST PROTO DEST PORT(S)
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ACCEPT loc:10.0.0.0/24!10.0.0.4,10.0.0.22 \
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net tcp 80
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That rule would allow loc->net HTTP access from the local
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network 10.0.0.0/24 except for hosts 10.0.0.4 and 10.0.0.22.
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10) Tunnel types "openvpnserver" and "openvpnclient" have been added
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to reflect the introduction of client and server OpenVPN
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configurations in OpenVPN 2.0.
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11) The COMMAND variable is now set to 'restore' in restore
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scripts. The value of this variable is sometimes of interest to
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programmers providing custom /etc/shorewall/tcstart scripts.
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12) Previously, if you defined any intra-zone rule(s) then any traffic
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not matching the rule(s) was subject to normal policies (which
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usually turned out to involve the all->all REJECT policy). Now, the
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intra-zone ACCEPT policy will still be in effect in the presence of
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intra-zone rules. That policy can still be overridden by an
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explicit policy in your /etc/shorewall/policy file.
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Example:
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/etc/shorewall/rules:
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DNAT loc:!192.168.1.4 loc:192.168.1.4:3128 tcp 80
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Any other loc->loc traffic will still be accepted. If you want to
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also log that other loc->loc traffic at the info log level then
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insert this into /etc/shorewall/policy:
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#SOURCE DEST POLICY LOG LEVEL
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loc loc ACCEPT info
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13) Prior to Shorewall 2.5.3, the rules file only controlled packets in
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the Netfilter states NEW and INVALID. Beginning with this release,
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the rules file can also deal with packets in the ESTABLISHED and
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RELATED states.
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The /etc/shorewall/rules file may now be divided into
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"sections". Each section is introduced by a line that begins with
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the keyword SECTION followed by the section name. Sections
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are as listed below and must appear in the order shown.
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ESTABLISHED
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Rules in this section apply to packets in the ESTABLISHED
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state.
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RELATED
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Rules in this section apply to packets in the RELATED state.
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NEW
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Rules in this section apply to packets in the NEW and INVALID
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states.
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Rules in the ESTABLISHED and RELATED sections are limited to the
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following ACTIONs:
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ACCEPT, DROP, REJECT, QUEUE, LOG and User-defined actions.
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Macros may be used in these sections provided that they expand to
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only these ACTIONs.
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At the end of the ESTABLISHED and RELATED sections, there is an
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implicit "ALLOW all all all" rule.
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RESTRICTION: If you specify FASTACCEPT=Yes in
|
|
/etc/shorewall.shorewall.conf then the ESTABLISHED and RELATED
|
|
sections must be empty.
|
|
|
|
14) The value 'ipp2p' is once again allowed in the PROTO column of
|
|
the rules file. It is recommended that rules specifying 'ipp2p'
|
|
only be included in the ESTABLISHED section of the file.
|
|
|
|
|
|
15) Shorewall actions lack a generalized way to pass parameters to an
|
|
extension script associated with an action. To work around this
|
|
lack, some users have used the log tag as a parameter. This works
|
|
but requires that a log level other than 'none' be specified when
|
|
the action is invoked. Beginning with this release, you can invoke
|
|
an action with 'none'.
|
|
|
|
Example:
|
|
|
|
#ACTION SOURCE DEST
|
|
A:none:these,are,parameters $FW net
|
|
|
|
When /etc/shorewall/A is invoked, the LEVEL variable will be empty
|
|
but the TAG variable will contain "these,are,parameters" which
|
|
can be easily parsed to isolate "these", "are" and "parameters":
|
|
|
|
ifs=$IFS
|
|
IFS=,
|
|
set -- $TAG
|
|
IFS=$ifs
|
|
|
|
Now, $1 = these, $2 = are and $3 = parameters
|
|
|
|
16) The "shorewall check" command now checks the /etc/shorewall/masq,
|
|
/etc/shorewall/blacklist, /etc/shorewall/proxyarp,
|
|
/etc/shorewall/nat and /etc/shorewall/providers files.
|
|
|
|
17) Arne Bernin's "tc4shorewall" package has been integrated into
|
|
Shorewall.
|
|
|
|
See: http://www.shorewall.net/3.0/traffic_shaping.htm for details.
|
|
|
|
Thanks, Arne!
|
|
|
|
18) When /usr/share/shorewall/functions is loaded it now sets
|
|
|
|
SHOREWALL_LIBRARY=Loaded
|
|
|
|
Application code such as /etc/shorewall/tcstart may test that
|
|
variable to determine if the library has been loaded into the
|
|
current shell process.
|
|
|
|
19) The install.sh script now does a much cleaner job of backing up the
|
|
current installation. It copies the directories /etc/shorewall,
|
|
/usr/share/shorewall and /var/lib/shorewall to a directory of the
|
|
same name with "-$VERSION.bkout" appended. The init script and
|
|
/sbin/shorewall are backed up to the /usr/share/shorewall and
|
|
/var/lib/shorewall directories respectively. This makes it very
|
|
simple to remove the backups:
|
|
|
|
rm -rf /etc/shorewall-*.bkout
|
|
rm -rf /usr/share/shorewall-*.bkout
|
|
rm -rf /var/lib/shorewall-*.bkout
|
|
|
|
20) A new '-n' option has been added to the "start", "restart",
|
|
"restore", "stop" and "try" commands. This option instructs
|
|
Shorewall to not alter the routing in any way.
|
|
|
|
This option is useful when you have a multi-ISP environment because
|
|
it prevents the route cache from being flushed which preserves the
|
|
mapping of end-point address pairs to routes.
|
|
|
|
21) The output of "shorewall dump" now includes a capabilities report
|
|
such as the one produced by "shorewall show capabilities".
|
|
|
|
22) The "plain" zone type has been replaced by "ipv4". The types
|
|
"IPv4" and "IPV4" are synonyms for "ipv4". In addition, "IPSEC",
|
|
"ipsec4" and "IPSEC4" are recognized synonyms for "ipsec".
|
|
|
|
23) The NEWNOTSYN and LOGNEWNOTSYN options in shorewall.conf have been
|
|
removed as have the 'newnotsyn' options in /etc/shorewall/interfaces
|
|
and /etc/shorewall/hosts. See the Migration Considerations for
|
|
instructions if you wish to block "new-not-syn" TCP packets.
|
|
|
|
24) The "shorewall show zones" command now displays the zone type. You
|
|
must have restarted Shorewall using this release before this feature
|
|
will work correctly.
|
|
|
|
25) The multi-ISP code now requires that that you set MARK_IN_FORWARD_CHAIN=Yes
|
|
in shorewall.conf. This is done to ensure that "shorewall refresh" will
|
|
work correctly.
|
|
|
|
26) Shorewall now supports UDP IPP2P matching. In addition to the "ipp2p"
|
|
keyword in the PROTOCOL column of the relevant files, the following
|
|
values may be specified:
|
|
|
|
ipp2p:tcp Equivalent to ipp2p and matches TCP traffic
|
|
only.
|
|
ipp2p:udp Matches UDP traffic.
|
|
ipp2p:all Matches both UDP and TCP traffic. You may
|
|
not specify a SOURCE PORT with this PROTOCOL.
|
|
|
|
27) Normally MAC verification triggered by the 'maclist' interface and host
|
|
options is done out of the INPUT and FORWARD chains of the filter table.
|
|
Users have reported that under some circumstances, MAC verification is
|
|
failing for forwarded packets when the packets are being forwarded out
|
|
of a bridge.
|
|
|
|
To work around this problem, a MACLIST_TABLE option has been added to
|
|
shorewall.conf. The default value is MACLIST_TABLE=filter which results
|
|
in the current behavior. If MACLIST_TABLE=mangle then filtering will
|
|
take place out of the PREROUTING chain of the mangle table. Because
|
|
the REJECT target may not be used in the PREROUTING chain, the settings
|
|
MACLIST_DISPOSITION=REJECT and MACLIST_TABLE=mangle are incompatible.
|
|
|
|
28) The sample configurations are now packaged with the product. They are
|
|
in the Samples directory on the tarball and are in the RPM they are
|
|
in the Samples sub-directory of the Shorewall documentation
|
|
directory.
|