如何使用python iptables编写特定的iptables规则

我试图使用python iptables编写一个脚本来设置某些规则。我知道如何设置规则来允许所有和拒绝所有，但我需要知道如何编写规则来允许已建立的连接

例如，我需要使用python iptables编写以下规则：

iptables -A INPUT  -m state --state     RELATED,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT

如果有人有第一手的知识，或者知道写上述或类似规则的好资源，我将非常感激。提前谢谢

这是成品。我计划添加更多规则选项，允许用户根据需要允许http/s等连接。感谢所有帮助。

import iptc

def dropAll():
    chain = iptc.Chain(iptc.Table(iptc.Table.FILTER), "INPUT")
    rule = iptc.Rule()
    rule.in_interface = "eth+"
    target = iptc.Target(rule, "DROP")
    rule.target = target
    chain.insert_rule(rule)

def allowLoopback():
    chain = iptc.Chain(iptc.Table(iptc.Table.FILTER), "INPUT")
    rule = iptc.Rule()
    rule.in_interface = "lo"
    target = iptc.Target(rule, "ACCEPT")
    rule.target = target
    chain.insert_rule(rule)

def allowEstablished():
    chain = iptc.Chain(iptc.Table(iptc.Table.FILTER), 'INPUT')
    rule = iptc.Rule()
    match = rule.create_match('state')
    match.state = "RELATED,ESTABLISHED"
    rule.target = iptc.Target(rule, 'ACCEPT')
    chain.insert_rule(rule)

dropAll()
allowLoopback()
allowEstablished()

试试这个

 import subprocess

p = subprocess.Popen(["iptables", "-A", "INPUT", "-p", "tcp", "-m", "tcp", "--dport", "22" , "-j", "ACCEPT"], stdout=subprocess.PIPE)
        output , err = p.communicate()
        print output

---

我没有尝试使用python iptables，但看起来您需要类似以下内容：

rule = iptc.Rule()
match = rule.create_match('state')
match.state = 'RELATED,ESTABLISHED'
match.target = iptc.Target('ACCEPT')

chain = iptc.Chain(iptc.Table.(iptc.Table.FILTER), "INPUT")
chain.insert_rule(rule)

---

诸如此类。

我知道这个古老的脚本，但我终于得到了一个工作脚本，希望有人会发现它有用

import iptc

class pop_table:
    def __init__(self, table_name):
        self.table = iptc.Table(table_name)
        self.chains = dict()

        for i in self.table.chains:
            self.chains[i.name] = iptc.Chain(self.table, i.name)

        self.method = {'append': self.append,
                       'insert': self.insert}

    def append(self, chain, rule):
        tmp = self.chains[chain]
        tmp.append_rule(rule)

    def insert(self, chain, rule):
        tmp = self.chains[chain]
        tmp.insert_rule(rule)


class make_rule(iptc.Rule):
    def __init__(self):
        iptc.Rule.__init__(self)

        self.method={'block': self.block,
                     'snat': self.snat,
                     'allow': self.allow,
                     'i_iface': self.i_iface,
                     'o_iface': self.o_iface,
                     'source': self.source,
                     'destination': self.destination}

    def block(self):
        t = iptc.Target(self, 'REJECT')
        self.target = t

    def snat(self, snat_ip):
        t = iptc.Target(self, 'SNAT')
        t.to_source = snat_ip
        self.target = t

    def allow(self):
        t = iptc.Target(self, 'ACCEPT')
        self.target = t

    def i_iface(self, iface):
        self.in_interface = iface

    def o_iface(self, iface):
        self.out_interface = iface

    def source(self, netaddr):
        self.src = netaddr

    def destination(self, netaddr):
        self.dst = netaddr

class phyawall:
    def __init__(self):
        self.list = []

    def add_rule(self, rule_dict):
        tbl = pop_table(rule_dict['tblchn']['table'])
        chn = rule_dict['tblchn']['chain']
        act = tbl.method[rule_dict['tblchn']['action']]
        tmp = make_rule()

        for i in rule_dict['rule']:
            tmp.method[i](rule_dict['rule'][i])
        act(chn, tmp)

#
#
# Testing :: below will go into main app
#

phyrule = dict()
phyrule['tblchn'] = dict()
phyrule['tblchn']['table'] = 'nat'
phyrule['tblchn']['chain'] = 'POSTROUTING'
phyrule['tblchn']['action'] = 'append'
phyrule['rule'] = dict()
phyrule['rule']['o_iface'] = 'ens3'
phyrule['rule']['snat'] = '10.1.2.250'
phyrule['rule']['source'] = '6.9.6.9'
phyrule['rule']['destination'] = '9.6.9.6'


a = phyawall()
a.add_rule(phyrule)

---

我今天会给大家一个机会，然后把它发回给大家。谢谢你的帮助。实际上我已经有了使用子流程的工作，这可能是更好的方法。我刚刚访问了python iptables，并希望使用该库实现规则。但是，我没有使用“output，err=p.communicate（）打印输出行，我可能会将其添加到我已经在工作的代码中。h33th3n，你是最终使用python库，还是仅仅调用子流程？最终是什么驱动了你的决定？好的，伙计们，这是我现在正在做的。第三条规则是有问题的孩子，但现在一切都正常了。我计划添加多条可选规则以允许http/s、 ssh等。如果用户愿意。感谢你们的帮助。有人知道我如何将上面的内容转换为编写规则的类吗？我是否可以将上面的内容转换为包含每个函数的对象？