ui/firewall_rules.c

   1 /* firewall_rules_dlg.c
   2  *
   3  * SPDX-License-Identifier: GPL-2.0-or-later
   4  */
   5
   6 /*
   7  * Generate firewall ACL rules based on packet addresses and ports.
   8  * For directional rules, an outside interface is assumed.
   9  *
  10  * There may be better ways to present the information, e.g. all rules
  11  * in one huge text window, or some sort of tree view.
  12  */
  13
  14 /*
  15  * To add a new product, add syntax functions modify the products[] array.
  16  *
  17  * To add a new syntax function, add its prototype above the products[]
  18  * array, and add the function below with all the others.
  19  */
  20
  21  /* Copied from gtk/firewall_rules.c */
  22
  23 #include "config.h"
  24
  25 #include <glib.h>
  26
  27 #include <wsutil/array.h>
  28 #include "epan/address.h"
  29
  30 #include "firewall_rules.h"
  31
  32 static void sf_ipfw_mac(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  33 static void sf_netfilter_mac(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  34
  35 static void sf_ios_std_ipv4(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  36 static void sf_ios_ext_ipv4(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  37 static void sf_ipfilter_ipv4(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  38 static void sf_ipfw_ipv4(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  39 static void sf_netfilter_ipv4(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  40 static void sf_pf_ipv4(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  41 /* XXX - Can you addresses-only filters using WFW/netsh? */
  42
  43 static void sf_ios_ext_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  44 static void sf_ipfilter_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  45 static void sf_ipfw_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  46 static void sf_netfilter_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  47 static void sf_pf_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  48 static void sf_netsh_port_old(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  49 static void sf_netsh_port_new(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  50
  51 static void sf_ios_ext_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  52 static void sf_ipfilter_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  53 static void sf_ipfw_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  54 static void sf_netfilter_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  55 static void sf_pf_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  56 static void sf_netsh_ipv4_port_old(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  57 static void sf_netsh_ipv4_port_new(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny);
  58
  59 typedef struct _fw_product_t {
  60     const char *name;
  61     const char *rule_hint;
  62     const char *comment_pfx;
  63     syntax_func mac_func;
  64     syntax_func ipv4_func;
  65     syntax_func port_func;
  66     syntax_func ipv4_port_func;
  67     bool does_inbound;
  68 } fw_product;
  69
  70 static fw_product products[] = {
  71     { "Cisco IOS (standard)", "Change NUMBER to a valid ACL number.", "!",
  72       NULL, sf_ios_std_ipv4, NULL, NULL, false },
  73     { "Cisco IOS (extended)", "Change NUMBER to a valid ACL number.", "!",
  74         NULL, sf_ios_ext_ipv4, sf_ios_ext_port, sf_ios_ext_ipv4_port, true },
  75     { "IP Filter (ipfilter)", "Change le0 to a valid interface if needed.", "#",
  76         NULL, sf_ipfilter_ipv4, sf_ipfilter_port, sf_ipfilter_ipv4_port, true },
  77     { "IPFirewall (ipfw)", "", "#",
  78         sf_ipfw_mac, sf_ipfw_ipv4, sf_ipfw_port, sf_ipfw_ipv4_port, true },
  79     { "Netfilter (iptables)", "Change eth0 to a valid interface if needed.", "#",
  80         sf_netfilter_mac, sf_netfilter_ipv4, sf_netfilter_port,
  81         sf_netfilter_ipv4_port, true },
  82     { "Packet Filter (pf)", "$ext_if should be set to a valid interface.", "#",
  83         NULL, sf_pf_ipv4, sf_pf_port, sf_pf_ipv4_port, true },
  84     { "Windows Firewall (netsh old syntax)", "", "#",
  85         NULL, NULL, sf_netsh_port_old, sf_netsh_ipv4_port_old, false },
  86     { "Windows Firewall (netsh new syntax)", "", "#",
  87         NULL, NULL, sf_netsh_port_new, sf_netsh_ipv4_port_new, false }
  88 };
  89 #define NUM_PRODS array_length(products)
  90
  91
  92 size_t firewall_product_count(void)
  93 {
  94     return NUM_PRODS;
  95 }
  96
  97 const char *firewall_product_name(size_t product_idx)
  98 {
  99     if (product_idx >= NUM_PRODS) return "Unknown";
 100     return products[product_idx].name;
 101 }
 102
 103 const char *firewall_product_rule_hint(size_t product_idx)
 104 {
 105     if (product_idx >= NUM_PRODS) return "";
 106     return products[product_idx].rule_hint;
 107 }
 108
 109 const char *firewall_product_comment_prefix(size_t product_idx)
 110 {
 111     if (product_idx >= NUM_PRODS) return "";
 112     return products[product_idx].comment_pfx;
 113 }
 114
 115 syntax_func firewall_product_mac_func(size_t product_idx)
 116 {
 117     if (product_idx >= NUM_PRODS) return NULL;
 118     return products[product_idx].mac_func;
 119 }
 120
 121
 122 syntax_func firewall_product_ipv4_func(size_t product_idx)
 123 {
 124     if (product_idx >= NUM_PRODS) return NULL;
 125     return products[product_idx].ipv4_func;
 126 }
 127
 128
 129 syntax_func firewall_product_port_func(size_t product_idx)
 130 {
 131     if (product_idx >= NUM_PRODS) return NULL;
 132     return products[product_idx].port_func;
 133 }
 134
 135
 136 syntax_func firewall_product_ipv4_port_func(size_t product_idx)
 137 {
 138     if (product_idx >= NUM_PRODS) return NULL;
 139     return products[product_idx].ipv4_port_func;
 140 }
 141
 142 bool firewall_product_does_inbound(size_t product_idx)
 143 {
 144     if (product_idx >= NUM_PRODS) return false;
 145     return products[product_idx].does_inbound;
 146 }
 147
 148
 149 /* MAC */
 150 #define IPFW_RULE(deny) ((deny) ? "deny" : "allow")
 151 #define IPFW_DIR(inbound) ((inbound) ? "in" : "out")
 152 static void sf_ipfw_mac(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype _U_, bool inbound, bool deny) {
 153     g_string_append_printf(rtxt, "add %s MAC %s any %s",
 154         IPFW_RULE(deny), addr, IPFW_DIR(inbound));
 155 }
 156
 157 #define NF_RULE(deny) ((deny) ? "DROP" : "ACCEPT")
 158 #define NF_DIR(inbound) ((inbound) ? "INPUT" : "OUTPUT")
 159 static void sf_netfilter_mac(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype _U_, bool inbound, bool deny) {
 160     g_string_append_printf(rtxt, "iptables --append %s --in-interface eth0 --mac-source %s --jump %s",
 161         NF_DIR(inbound), addr, NF_RULE(deny));
 162 }
 163
 164 /* IPv4 */
 165 #define IOS_RULE(deny) ((deny) ? "deny" : "permit")
 166 static void sf_ios_std_ipv4(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype _U_, bool inbound _U_, bool deny) {
 167     g_string_append_printf(rtxt, "access-list NUMBER %s host %s", IOS_RULE(deny), addr);
 168 }
 169
 170 static void sf_ios_ext_ipv4(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype _U_, bool inbound, bool deny) {
 171     if (inbound)
 172         g_string_append_printf(rtxt, "access-list NUMBER %s ip host %s any", IOS_RULE(deny), addr);
 173     else
 174         g_string_append_printf(rtxt, "access-list NUMBER %s ip any host %s", IOS_RULE(deny), addr);
 175 }
 176
 177 #define IPFILTER_RULE(deny) ((deny) ? "block" : "pass")
 178 #define IPFILTER_DIR(inbound) ((inbound) ? "in" : "out")
 179
 180 static void sf_ipfilter_ipv4(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype _U_, bool inbound, bool deny) {
 181     g_string_append_printf(rtxt, "%s %s on le0 from %s to any",
 182         IPFILTER_RULE(deny), IPFILTER_DIR(inbound), addr);
 183 }
 184
 185 static void sf_ipfw_ipv4(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype _U_, bool inbound, bool deny) {
 186     g_string_append_printf(rtxt, "add %s ip from %s to any %s",
 187         IPFW_RULE(deny), addr, IPFW_DIR(inbound));
 188 }
 189
 190 #define NF_ADDR_DIR(inbound) ((inbound) ? "--source" : "--destination")
 191 static void sf_netfilter_ipv4(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype _U_, bool inbound, bool deny) {
 192     g_string_append_printf(rtxt, "iptables --append %s --in-interface eth0 %s %s/32 --jump %s",
 193         NF_DIR(inbound), NF_ADDR_DIR(inbound), addr, NF_RULE(deny));
 194 }
 195
 196 #define PF_RULE(deny) ((deny) ? "block" : "pass")
 197 #define PF_DIR(inbound) ((inbound) ? "in" : "out")
 198 static void sf_pf_ipv4(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype _U_, bool inbound, bool deny) {
 199     g_string_append_printf(rtxt, "%s %s quick on $ext_if from %s to any",
 200         PF_RULE(deny), PF_DIR(inbound), addr);
 201 }
 202
 203 /* Port */
 204 #define RT_TCP_UDP(ptype) ((ptype) == PT_TCP ? "tcp" : "udp")
 205 static void sf_ios_ext_port(GString *rtxt, char *addr _U_, uint32_t port, port_type ptype, bool inbound _U_, bool deny) {
 206     g_string_append_printf(rtxt, "access-list NUMBER %s %s any any eq %u",
 207         IOS_RULE(deny), RT_TCP_UDP(ptype), port);
 208 }
 209
 210 static void sf_ipfilter_port(GString *rtxt, char *addr _U_, uint32_t port, port_type ptype, bool inbound, bool deny) {
 211     g_string_append_printf(rtxt, "%s %s on le0 proto %s from any to any port = %u",
 212         IPFILTER_RULE(deny), IPFILTER_DIR(inbound), RT_TCP_UDP(ptype), port);
 213 }
 214
 215 static void sf_ipfw_port(GString *rtxt, char *addr _U_, uint32_t port, port_type ptype, bool inbound, bool deny) {
 216     g_string_append_printf(rtxt, "add %s %s from any to any %u %s",
 217         IPFW_RULE(deny), RT_TCP_UDP(ptype), port, IPFW_DIR(inbound));
 218 }
 219
 220 #define NF_PORT_DIR(inbound) ((inbound) ? "--source-port" : "--destination-port")
 221 static void sf_netfilter_port(GString *rtxt, char *addr _U_, uint32_t port, port_type ptype, bool inbound, bool deny) {
 222     g_string_append_printf(rtxt, "iptables --append %s --in-interface eth0 --protocol %s %s %u --jump %s",
 223             NF_DIR(inbound), RT_TCP_UDP(ptype), NF_PORT_DIR(inbound), port, NF_RULE(deny));
 224 }
 225
 226 static void sf_pf_port(GString *rtxt, char *addr _U_, uint32_t port, port_type ptype, bool inbound, bool deny) {
 227     g_string_append_printf(rtxt, "%s %s quick on $ext_if proto %s from any to any port %u",
 228         PF_RULE(deny), PF_DIR(inbound), RT_TCP_UDP(ptype), port);
 229 }
 230
 231 #define NETSH_RULE_OLD(deny) ((deny) ? "DISABLE" : "ENABLE")
 232 static void sf_netsh_port_old(GString *rtxt, char *addr _U_, uint32_t port, port_type ptype, bool inbound _U_, bool deny) {
 233     g_string_append_printf(rtxt, "add portopening %s %u Wireshark %s",
 234         RT_TCP_UDP(ptype), port, NETSH_RULE_OLD(deny));
 235 }
 236
 237 #define NETSH_RULE_NEW(deny) ((deny) ? "block" : "allow")
 238 static void sf_netsh_port_new(GString *rtxt, char *addr _U_, uint32_t port, port_type ptype, bool inbound _U_, bool deny) {
 239     g_string_append_printf(rtxt, "add rule name=\"Wireshark\" dir=in action=%s protocol=%s localport=%u",
 240         NETSH_RULE_NEW(deny), RT_TCP_UDP(ptype), port);
 241 }
 242
 243 /* IPv4 + port */
 244 static void sf_ios_ext_ipv4_port(GString *rtxt, char *addr, uint32_t port _U_, port_type ptype, bool inbound, bool deny) {
 245     if (inbound)
 246         g_string_append_printf(rtxt, "access-list NUMBER %s %s host %s eq %u any", IOS_RULE(deny), RT_TCP_UDP(ptype), addr, port);
 247     else
 248         g_string_append_printf(rtxt, "access-list NUMBER %s %s any host %s eq %u", IOS_RULE(deny), RT_TCP_UDP(ptype), addr, port);
 249 }
 250
 251 static void sf_ipfilter_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny) {
 252     if (inbound)
 253         g_string_append_printf(rtxt, "%s %s on le0 proto %s from %s port = %u to any",
 254             IPFILTER_RULE(deny), IPFILTER_DIR(inbound), RT_TCP_UDP(ptype), addr, port);
 255     else
 256         g_string_append_printf(rtxt, "%s %s on le0 proto %s from any to %s port = %u",
 257             IPFILTER_RULE(deny), IPFILTER_DIR(inbound), RT_TCP_UDP(ptype), addr, port);
 258 }
 259
 260 static void sf_ipfw_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny) {
 261     g_string_append_printf(rtxt, "add %s %s from %s %u to any %s",
 262         IPFW_RULE(deny), RT_TCP_UDP(ptype), addr, port, IPFW_DIR(inbound));
 263 }
 264
 265 static void sf_pf_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny) {
 266     g_string_append_printf(rtxt, "%s %s quick on $ext_if proto %s from %s to any port %u",
 267         PF_RULE(deny), PF_DIR(inbound), RT_TCP_UDP(ptype), addr, port);
 268 }
 269
 270 static void sf_netfilter_ipv4_port(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound, bool deny) {
 271     g_string_append_printf(rtxt, "iptables --append %s --in-interface eth0 --protocol %s %s %s/32 %s %u --jump %s",
 272         NF_DIR(inbound), RT_TCP_UDP(ptype), NF_ADDR_DIR(inbound), addr, NF_PORT_DIR(inbound), port, NF_RULE(deny));
 273 }
 274
 275 static void sf_netsh_ipv4_port_old(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound _U_, bool deny) {
 276     g_string_append_printf(rtxt, "add portopening %s %u Wireshark %s %s",
 277         RT_TCP_UDP(ptype), port, NETSH_RULE_OLD(deny), addr);
 278 }
 279
 280 static void sf_netsh_ipv4_port_new(GString *rtxt, char *addr, uint32_t port, port_type ptype, bool inbound _U_, bool deny) {
 281     g_string_append_printf(rtxt, "add rule name=\"Wireshark\" dir=in action=%s protocol=%s localport=%u remoteip=%s",
 282         NETSH_RULE_NEW(deny), RT_TCP_UDP(ptype), port, addr);
 283 }