This is a minor release of Shorewall. Problems Corrected: 1) A problem seen on RH7.3 systems where Shorewall encountered start errors when started using the "service" mechanism has been worked around. 2) Where a list of IP addresses appears in the DEST column of a DNAT[-] rule, Shorewall incorrectly created multiple DNAT rules in the nat table (one for each element in the list). Shorewall now correctly creates a single DNAT rule with multiple "--to-destination" clauses. 3) Corrected a problem in Beta 1 where DNS names containing a "-" were mis-handled when they appeared in the DEST column of a rule. 4) The handling of z1!z2 in the SOURCE column of DNAT and REDIRECT rules has been corrected. 5) The message "Adding rules for DHCP" is now suppressed if there are no DHCP rules to add. 6) Corrected problem in 1.4.6 where the MANGLE_ENABLED variable was being tested before it was set. 7) Corrected handling of MAC addresses in the SOURCE column of the tcrules file. Previously, these addresses resulted in an invalid iptables command. 8) The "shorewall stop" command is now disabled when /etc/shorewall/startup_disabled exists. This prevents people from shooting themselves in the foot prior to having configured Shorewall. 9) A change introduced in version 1.4.6 caused error messages during "shorewall [re]start" when ADD_IP_ALIASES=Yes and ip addresses were being added to a PPP interface; the addresses were successfully added in spite of the messages. The firewall script has been modified to eliminate the error messages. 10) When ADD_SNAT_ALIASES=Yes in shorewall.conf, the following entry in /etc/shorewall/masq resulted in a startup error: eth0 eth1 206.124.146.20-206.124.146.24 11) Shorewall previously choked over IPV6 addresses configured on interfaces in contexts where Shorewall needed to detect something about the interface (such as when "detect" appears in the BROADCAST column of the /etc/shorewall/interfaces file). Migration Issues: 1) In earlier versions, an undocumented feature allowed entries in the host file as follows: z eth1:192.168.1.0/24,eth2:192.168.2.0/24 This capability was never documented and has been removed in 1.4.6 to allow entries of the following format: z eth1:192.168.1.0/24,192.168.2.0/24 2) The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT options have been removed from /etc/shorewall/shorewall.conf. These capabilities are now automatically detected by Shorewall (see below). New Features: 1) A 'newnotsyn' interface option has been added. This option may be specified in /etc/shorewall/interfaces and overrides the setting NEWNOTSYN=No for packets arriving on the associated interface. 2) The means for specifying a range of IP addresses in /etc/shorewall/masq to use for SNAT is now documented. ADD_SNAT_ALIASES=Yes is enabled for address ranges. 3) Shorewall can now add IP addresses to subnets other than the first one on an interface. 4) DNAT[-] rules may now be used to load balance (round-robin) over a set of servers. Any number of servers may be specified in a range of addresses given as - and multiple ranges or individual servers may be specified in a comma-separated list. Example: DNAT net loc:192.168.10.2-192.168.10.5,192.168.10.44 tcp 80 5) The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration options have been removed and have been replaced by code that detects whether these capabilities are present in the current kernel. The output of the start, restart and check commands have been enhanced to report the outcome: Shorewall has detected the following iptables/netfilter capabilities: NAT: Available Packet Mangling: Available Multi-port Match: Available Verifying Configuration... 6) Support for the Connection Tracking Match Extension has been added. This extension is available in recent kernel/iptables releases and allows for rules which match against elements in netfilter's connection tracking table. Shorewall automatically detects the availability of this extension and reports its availability in the output of the start, restart and check commands. Shorewall has detected the following iptables/netfilter capabilities: NAT: Available Packet Mangling: Available Multi-port Match: Available Connection Tracking Match: Available Verifying Configuration... If this extension is available, the ruleset generated by Shorewall is changed in the following ways: a) To handle 'norfc1918' filtering, Shorewall will not create chains in the mangle table but will rather do all 'norfc1918' filtering in the filter table (rfc1918 chain). b) Recall that Shorewall DNAT rules generate two netfilter rules; one in the nat table and one in the filter table. If the Connection Tracking Match Extension is available, the rule in the filter table is extended to check that the original destination address was the same as specified (or defaulted to) in the DNAT rule. 7) The shell used to interpret the firewall script (/usr/share/shorewall/firewall) may now be specified using the SHOREWALL_SHELL parameter in shorewall.conf. 8) An 'ipcalc' command has been added to /sbin/shorewall. ipcalc [
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/ ] Examples: [root@wookie root]# shorewall ipcalc 192.168.1.0/24 CIDR=192.168.1.0/24 NETMASK=255.255.255.0 NETWORK=192.168.1.0 BROADCAST=192.168.1.255 [root@wookie root]# [root@wookie root]# shorewall ipcalc 192.168.1.0 255.255.255.0 CIDR=192.168.1.0/24 NETMASK=255.255.255.0 NETWORK=192.168.1.0 BROADCAST=192.168.1.255 [root@wookie root]# Warning: If your shell only supports 32-bit signed arithmatic (ash or dash), then the ipcalc command produces incorrect information for IP addresses 128.0.0.0-1 and for /1 networks. Bash should produce correct information for all valid IP addresses. 9) An 'iprange' command has been added to /sbin/shorewall. iprange
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This command decomposes a range of IP addressses into a list of network and host addresses. The command can be useful if you need to construct an efficient set of rules that accept connections from a range of network addresses. Note: If your shell only supports 32-bit signed arithmetic (ash or dash) then the range may not span 128.0.0.0. Example: [root@gateway root]# shorewall iprange 192.168.1.4-192.168.12.9 192.168.1.4/30 192.168.1.8/29 192.168.1.16/28 192.168.1.32/27 192.168.1.64/26 192.168.1.128/25 192.168.2.0/23 192.168.4.0/22 192.168.8.0/22 192.168.12.0/29 192.168.12.8/31 [root@gateway root]# 10) A list of host/net addresses is now allowed in an entry in /etc/shorewall/hosts. Example: foo eth1:192.168.1.0/24,192.168.2.0/24 11) The "shorewall check" command now includes the chain name when printing the applicable policy for each pair of zones. Example: Policy for dmz to net is REJECT using chain all2all This means that the policy for connections from the dmz to the internet is REJECT and the applicable entry in the /etc/shorewall/policy was the all->all policy. 12) Support for the 2.6 Kernel series has been added.