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LAN only filtering now properly handles mapped ipv4.

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This commit is contained in:
Mr_Goldberg 2022-08-13 14:36:34 -04:00
parent 0a80b60b6c
commit 0082242a6f
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GPG Key ID: 8597D87419DEF278
1 changed files with 26 additions and 14 deletions
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34
dll/base.cpp
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@ -563,15 +563,9 @@ static bool is_whitelist_ip(unsigned char *ip)
return false; return false;
} }
static bool is_lan_ip(const sockaddr *addr, int namelen) static bool is_lan_ipv4(unsigned char *ip)
{ {
if (!namelen) return false; PRINT_DEBUG("CHECK LAN IP %hhu.%hhu.%hhu.%hhu\n", ip[0], ip[1], ip[2], ip[3]);
if (addr->sa_family == AF_INET) {
struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
unsigned char ip[4];
memcpy(ip, &addr_in->sin_addr, sizeof(ip));
PRINT_DEBUG("CHECK LAN IP %hhu.%hhu.%hhu.%hhu:%u\n", ip[0], ip[1], ip[2], ip[3], ntohs(addr_in->sin_port));
if (is_whitelist_ip(ip)) return true; if (is_whitelist_ip(ip)) return true;
if (ip[0] == 127) return true; if (ip[0] == 127) return true;
if (ip[0] == 10) return true; if (ip[0] == 10) return true;
@ -582,13 +576,25 @@ static bool is_lan_ip(const sockaddr *addr, int namelen)
if (ip[0] == 239) return true; //multicast if (ip[0] == 239) return true; //multicast
if (ip[0] == 0) return true; //Current network if (ip[0] == 0) return true; //Current network
if (ip[0] == 192 && (ip[1] == 18 || ip[1] == 19)) return true; //Used for benchmark testing of inter-network communications between two separate subnets. if (ip[0] == 192 && (ip[1] == 18 || ip[1] == 19)) return true; //Used for benchmark testing of inter-network communications between two separate subnets.
if (ip[0] >= 224) return true; //ip multicast (224 - 239) future use (240.0.0.0–255.255.255.254) broadcast (255.255.255.255) if (ip[0] >= 224) return true; //ip multicast (224 - 239) future use (240.0.0.0 - 255.255.255.254) broadcast (255.255.255.255)
return false;
}
static bool is_lan_ip(const sockaddr *addr, int namelen)
{
if (!namelen) return false;
if (addr->sa_family == AF_INET) {
struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
unsigned char ip[4];
memcpy(ip, &addr_in->sin_addr, sizeof(ip));
if (is_lan_ipv4(ip)) return true;
} else if (addr->sa_family == AF_INET6) { } else if (addr->sa_family == AF_INET6) {
struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr; struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
unsigned char ip[16]; unsigned char ip[16];
unsigned char zeroes[16] = {}; unsigned char zeroes[16] = {};
memcpy(ip, &addr_in6->sin6_addr, sizeof(ip)); memcpy(ip, &addr_in6->sin6_addr, sizeof(ip));
PRINT_DEBUG("CHECK LAN IP6 %hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu...%hhu\n", ip[0], ip[1], ip[2], ip[3], ip[4], ip[5], ip[6], ip[7], ip[15]); PRINT_DEBUG("CHECK LAN IP6 %hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu.%hhu\n", ip[0], ip[1], ip[2], ip[3], ip[4], ip[5], ip[6], ip[7], ip[8], ip[9], ip[10], ip[11], ip[12], ip[13], ip[14], ip[15]);
if (((ip[0] == 0xFF) && (ip[1] < 3) && (ip[15] == 1)) || if (((ip[0] == 0xFF) && (ip[1] < 3) && (ip[15] == 1)) ||
((ip[0] == 0xFE) && ((ip[1] & 0xC0) == 0x80))) return true; ((ip[0] == 0xFE) && ((ip[1] & 0xC0) == 0x80))) return true;
if (memcmp(zeroes, ip, sizeof(ip)) == 0) return true; if (memcmp(zeroes, ip, sizeof(ip)) == 0) return true;
@ -596,7 +602,13 @@ static bool is_lan_ip(const sockaddr *addr, int namelen)
if (ip[0] == 0xff) return true; //multicast if (ip[0] == 0xff) return true; //multicast
if (ip[0] == 0xfc) return true; //unique local if (ip[0] == 0xfc) return true; //unique local
if (ip[0] == 0xfd) return true; //unique local if (ip[0] == 0xfd) return true; //unique local
//TODO: ipv4 mapped?
unsigned char ipv4_mapped[12] = {};
ipv4_mapped[10] = 0xFF;
ipv4_mapped[11] = 0xFF;
if (memcmp(ipv4_mapped, ip, sizeof(ipv4_mapped)) == 0) {
if (is_lan_ipv4(ip + 12)) return true;
}
} }
PRINT_DEBUG("NOT LAN IP\n"); PRINT_DEBUG("NOT LAN IP\n");