232. SuSEFirewallExpertRules

Interface manipulation of /etc/sysconfig/SuSEFirewall (expert rules)

232.1. Summary of Module Globals

List of Global Functions

AddNewAcceptRule - Adds a new accept-rule. Possible keys for parameters are "network", "protocol", "dport" and "sport". Needed are "network" and "protocol".
GetAllExpertRulesProtocols - Returns list of all protocols accepted by the expert rules.
GetListOfAcceptRules - Returns list of rules (maps) describing protocols and ports that are allowed to be accessed from listed hosts. "network" and "protocol" are needed arguments, "dport" and "sport" are optional. Undefined values are returned as empty strings.
IsValidNetwork - Function checks the network definition used for firewall expert rules.
RemoveAcceptRule - Removes a single expert firewall rule.
ValidNetwork - Returns string of valid network definition.

List of Global Variables

232.2. Global Functions

232.2.1. AddNewAcceptRule

Adds a new accept-rule. Possible keys for parameters are "network", "protocol", "dport" and "sport". Needed are "network" and "protocol".

Function parameters

string zone
map <string, string> params

Return value

boolean

Example 68.

 AddNewAcceptRule (
     "EXT",
     $["network":"192.168.0.1/255.255.240.0", "protocol":"tcp", "sport":"22"]
 ) -> true

232.2.2. GetAllExpertRulesProtocols

Returns list of all protocols accepted by the expert rules.

Return value

list <string>

232.2.3. GetListOfAcceptRules

Returns list of rules (maps) describing protocols and ports that are allowed to be accessed from listed hosts. "network" and "protocol" are needed arguments, "dport" and "sport" are optional. Undefined values are returned as empty strings.

Function parameters

string zone

Return value

list <map <string, string> > - of rules

This might return, e.g., [
     // All requests from 80.44.11.22 to TCP port 22
	   $[ "network" : "80.44.11.22",   "protocol" : "tcp", "dport" : "22",  "sport" : ""   ],

     // All requests from network 80.44.11.0/24 to UDP port 53 originating on port 53
	   $[ "network" : "80.44.11.0/24", "protocol" : "udp", "dport" : "53",  "sport" : "53" ],

     // All requests from network 0/0 (everywhere) to TCP port 443
	   $[ "network" : "0/0",           "protocol" : "tcp", "dport" : "443", "sport" : ""   ],
 ]

Example 69.

 GetListOfAcceptRules("EXT") -> $[]

232.2.4. IsValidNetwork

Function checks the network definition used for firewall expert rules.

Function parameters

string network

Return value

boolean - if it is a valid network definition

Example 70.

 IsValidNetwork("192.168.0.1")               -> true
 IsValidNetwork("192.168.0.355")             -> false
 IsValidNetwork("192.168.0.0/24")            -> true
 IsValidNetwork("192.168.0.1/32")            -> true
 IsValidNetwork("192.168.0.1/0")             -> false
 IsValidNetwork("192.168.0.0/255.255.0.0")   -> true
 IsValidNetwork("192.168.0.0/255.255.333.0") -> false
 IsValidNetwork("192.168.0.0/255.255.224.0") -> true
 IsValidNetwork("0/0")                       -> true

232.2.5. RemoveAcceptRule

Removes a single expert firewall rule.

Function parameters

string zone
map <string, string> params

Return value

boolean

Example 71.

 RemoveAcceptRule (
     "EXT",
     $["network":"192.168.0.1/255.255.240.0", "protocol":"tcp", "sport":"22"]
 ) -> true

232.2.6. ValidNetwork

Returns string of valid network definition.

Return value

string - describing the valid network.

232.3. Global Variables

232.4. Module Requirements

232.4.1. Module Imports

IP
Netmask
SuSEFirewall


231. SuSEFirewallCMDLine		233. SuSEFirewallProposal