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Linux/net/netfilter/xt_AUDIT.c

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  1 /*
  2  * Creates audit record for dropped/accepted packets
  3  *
  4  * (C) 2010-2011 Thomas Graf <tgraf@redhat.com>
  5  * (C) 2010-2011 Red Hat, Inc.
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10 */
 11 
 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 13 
 14 #include <linux/audit.h>
 15 #include <linux/module.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/tcp.h>
 18 #include <linux/udp.h>
 19 #include <linux/if_arp.h>
 20 #include <linux/netfilter/x_tables.h>
 21 #include <linux/netfilter/xt_AUDIT.h>
 22 #include <linux/netfilter_bridge/ebtables.h>
 23 #include <net/ipv6.h>
 24 #include <net/ip.h>
 25 
 26 MODULE_LICENSE("GPL");
 27 MODULE_AUTHOR("Thomas Graf <tgraf@redhat.com>");
 28 MODULE_DESCRIPTION("Xtables: creates audit records for dropped/accepted packets");
 29 MODULE_ALIAS("ipt_AUDIT");
 30 MODULE_ALIAS("ip6t_AUDIT");
 31 MODULE_ALIAS("ebt_AUDIT");
 32 MODULE_ALIAS("arpt_AUDIT");
 33 
 34 static void audit_proto(struct audit_buffer *ab, struct sk_buff *skb,
 35                         unsigned int proto, unsigned int offset)
 36 {
 37         switch (proto) {
 38         case IPPROTO_TCP:
 39         case IPPROTO_UDP:
 40         case IPPROTO_UDPLITE: {
 41                 const __be16 *pptr;
 42                 __be16 _ports[2];
 43 
 44                 pptr = skb_header_pointer(skb, offset, sizeof(_ports), _ports);
 45                 if (pptr == NULL) {
 46                         audit_log_format(ab, " truncated=1");
 47                         return;
 48                 }
 49 
 50                 audit_log_format(ab, " sport=%hu dport=%hu",
 51                                  ntohs(pptr[0]), ntohs(pptr[1]));
 52                 }
 53                 break;
 54 
 55         case IPPROTO_ICMP:
 56         case IPPROTO_ICMPV6: {
 57                 const u8 *iptr;
 58                 u8 _ih[2];
 59 
 60                 iptr = skb_header_pointer(skb, offset, sizeof(_ih), &_ih);
 61                 if (iptr == NULL) {
 62                         audit_log_format(ab, " truncated=1");
 63                         return;
 64                 }
 65 
 66                 audit_log_format(ab, " icmptype=%hhu icmpcode=%hhu",
 67                                  iptr[0], iptr[1]);
 68 
 69                 }
 70                 break;
 71         }
 72 }
 73 
 74 static void audit_ip4(struct audit_buffer *ab, struct sk_buff *skb)
 75 {
 76         struct iphdr _iph;
 77         const struct iphdr *ih;
 78 
 79         ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
 80         if (!ih) {
 81                 audit_log_format(ab, " truncated=1");
 82                 return;
 83         }
 84 
 85         audit_log_format(ab, " saddr=%pI4 daddr=%pI4 ipid=%hu proto=%hhu",
 86                 &ih->saddr, &ih->daddr, ntohs(ih->id), ih->protocol);
 87 
 88         if (ntohs(ih->frag_off) & IP_OFFSET) {
 89                 audit_log_format(ab, " frag=1");
 90                 return;
 91         }
 92 
 93         audit_proto(ab, skb, ih->protocol, ih->ihl * 4);
 94 }
 95 
 96 static void audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
 97 {
 98         struct ipv6hdr _ip6h;
 99         const struct ipv6hdr *ih;
100         u8 nexthdr;
101         __be16 frag_off;
102         int offset;
103 
104         ih = skb_header_pointer(skb, skb_network_offset(skb), sizeof(_ip6h), &_ip6h);
105         if (!ih) {
106                 audit_log_format(ab, " truncated=1");
107                 return;
108         }
109 
110         nexthdr = ih->nexthdr;
111         offset = ipv6_skip_exthdr(skb, skb_network_offset(skb) + sizeof(_ip6h),
112                                   &nexthdr, &frag_off);
113 
114         audit_log_format(ab, " saddr=%pI6c daddr=%pI6c proto=%hhu",
115                          &ih->saddr, &ih->daddr, nexthdr);
116 
117         if (offset)
118                 audit_proto(ab, skb, nexthdr, offset);
119 }
120 
121 static unsigned int
122 audit_tg(struct sk_buff *skb, const struct xt_action_param *par)
123 {
124         const struct xt_audit_info *info = par->targinfo;
125         struct audit_buffer *ab;
126 
127         ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
128         if (ab == NULL)
129                 goto errout;
130 
131         audit_log_format(ab, "action=%hhu hook=%u len=%u inif=%s outif=%s",
132                          info->type, par->hooknum, skb->len,
133                          par->in ? par->in->name : "?",
134                          par->out ? par->out->name : "?");
135 
136         if (skb->mark)
137                 audit_log_format(ab, " mark=%#x", skb->mark);
138 
139         if (skb->dev && skb->dev->type == ARPHRD_ETHER) {
140                 audit_log_format(ab, " smac=%pM dmac=%pM macproto=0x%04x",
141                                  eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
142                                  ntohs(eth_hdr(skb)->h_proto));
143 
144                 if (par->family == NFPROTO_BRIDGE) {
145                         switch (eth_hdr(skb)->h_proto) {
146                         case __constant_htons(ETH_P_IP):
147                                 audit_ip4(ab, skb);
148                                 break;
149 
150                         case __constant_htons(ETH_P_IPV6):
151                                 audit_ip6(ab, skb);
152                                 break;
153                         }
154                 }
155         }
156 
157         switch (par->family) {
158         case NFPROTO_IPV4:
159                 audit_ip4(ab, skb);
160                 break;
161 
162         case NFPROTO_IPV6:
163                 audit_ip6(ab, skb);
164                 break;
165         }
166 
167 #ifdef CONFIG_NETWORK_SECMARK
168         if (skb->secmark)
169                 audit_log_secctx(ab, skb->secmark);
170 #endif
171 
172         audit_log_end(ab);
173 
174 errout:
175         return XT_CONTINUE;
176 }
177 
178 static unsigned int
179 audit_tg_ebt(struct sk_buff *skb, const struct xt_action_param *par)
180 {
181         audit_tg(skb, par);
182         return EBT_CONTINUE;
183 }
184 
185 static int audit_tg_check(const struct xt_tgchk_param *par)
186 {
187         const struct xt_audit_info *info = par->targinfo;
188 
189         if (info->type > XT_AUDIT_TYPE_MAX) {
190                 pr_info("Audit type out of range (valid range: 0..%hhu)\n",
191                         XT_AUDIT_TYPE_MAX);
192                 return -ERANGE;
193         }
194 
195         return 0;
196 }
197 
198 static struct xt_target audit_tg_reg[] __read_mostly = {
199         {
200                 .name           = "AUDIT",
201                 .family         = NFPROTO_UNSPEC,
202                 .target         = audit_tg,
203                 .targetsize     = sizeof(struct xt_audit_info),
204                 .checkentry     = audit_tg_check,
205                 .me             = THIS_MODULE,
206         },
207         {
208                 .name           = "AUDIT",
209                 .family         = NFPROTO_BRIDGE,
210                 .target         = audit_tg_ebt,
211                 .targetsize     = sizeof(struct xt_audit_info),
212                 .checkentry     = audit_tg_check,
213                 .me             = THIS_MODULE,
214         },
215 };
216 
217 static int __init audit_tg_init(void)
218 {
219         return xt_register_targets(audit_tg_reg, ARRAY_SIZE(audit_tg_reg));
220 }
221 
222 static void __exit audit_tg_exit(void)
223 {
224         xt_unregister_targets(audit_tg_reg, ARRAY_SIZE(audit_tg_reg));
225 }
226 
227 module_init(audit_tg_init);
228 module_exit(audit_tg_exit);
229 

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