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stun.spicy
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stun.spicy
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module STUN;
import zeek;
type AddrFamily = enum { IPv4 = 0x01, IPv6 = 0x02 };
public type MsgType = enum {
BINDING_REQ = 0x0001,
IND = 0x0011,
BINDING_SUC = 0x0101,
BINDING_ERR = 0x0111,
ALLOCATE_REQ = 0x0003,
ALLOCATE_SUC = 0x0103,
ALLOCATE_ERR = 0x0113
};
type AttrType = enum {
MAPPED_ADDRESS = 0x0001,
USERNAME = 0x0006,
MESSAGE_INTEGRITY = 0x0008,
ERROR_CODE = 0x0009,
UNKNOWN_ATTRIBUTES = 0x000A,
CHANNEL_NUMBER = 0x000C,
LIFETIME = 0x000D,
XOR_PEER_ADDRESS = 0x0012,
DATA = 0x0013,
REALM = 0x0014,
NONCE = 0x0015,
XOR_RELAYED_ADDRESS = 0x0016,
REQUESTED_ADDRESS_FAMILY = 0x0017,
EVEN_PORT = 0x0018,
REQUESTED_TRANSPORT = 0x0019,
DONT_FRAGMENT = 0x001A,
ACCESS_TOKEN = 0x001B,
MESSAGE_INTEGRITY_SHA256 = 0x001C,
PASSWORD_ALGORITHM = 0x001D,
USERHASH = 0x001E,
XOR_MAPPED_ADDRESS = 0x0020,
RESERVATION_TOKEN = 0x0022,
PRIORITY = 0x0024,
USE_CANDIDATE = 0x0025,
PADDING = 0x0026,
RESPONSE_PORT = 0x0027,
CONNECTION_ID = 0x002A,
ADDITIONAL_ADDRESS_FAMILY = 0x8000,
ADDRESS_ERROR_CODE = 0x8001,
PASSWORD_ALGORITHMS = 0x8002,
ALTERNATE_DOMAIN = 0x8003,
ICMP = 0x8004,
SOFTWARE = 0x8022,
ALTERNATE_SERVER = 0x8023,
TRANSACTION_TRANSMIT_COUNTER = 0x8025,
CACHE_TIMEOUT = 0x8027,
FINGERPRINT = 0x8028,
ICE_CONTROLLED = 0x8029,
ICE_CONTROLLING = 0x802A,
RESPONSE_ORIGIN = 0x802B,
OTHER_ADDRESS = 0x802C,
ECN_CHECK = 0x802D,
THIRD_PARTY_AUTHORIZATION = 0x802E,
MOBILITY_TICKET = 0x8030,
CISCO_STUN_FLOWDATA = 0xC000,
ENF_FLOW_DESCRIPTION = 0xC001,
ENF_NETWORK_STATUS = 0xC002,
GOOG_MISC_INFO = 0xC059,
GOOG_MESSAGE_INTEGRITY_32 = 0xC05A
};
const VALID_COOKIE = 554869826;
# RFC5389:
#
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# |0 0| STUN Message Type | Message Length |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Magic Cookie |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | |
# | Transaction ID (96 bits) |
# | |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | [Attributes, |
# | ...] |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
public type Packet = unit {
msg_type: uint16 &convert=MsgType($$);
msg_length: uint16;
cookie: uint32;
trans_id: bytes &size=12;
attributes: Attribute[];
on cookie {
if ( self.cookie == VALID_COOKIE ) {
zeek::confirm_protocol();
} else {
zeek::reject_protocol("Not a STUN packet");
}
}
on %done {
print "Type: %s" % self.msg_type;
# print "Length: %s" % self.msg_length;
# print "Cookie: %s" % self.cookie;
# print "Transaction id: %s" % self.trans_id;
# print "Attributes:";
# for (attr in self.attributes) {
# print(attr);
# }
}
# on %error {
# #zeek::reject_protocol("ERROR IN STUN PARSER");
# print "ERROR";
# }
};
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Type | Length |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Value (variable)... |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# https://tools.ietf.org/html/rfc5389#section-15
type Attribute = unit {
attr_type: uint16 &convert=AttrType($$);
attr_length: uint16 {
self.value_padding = padding($$);
self.total_size = $$ + self.value_padding;
}
switch (self.attr_type) {
AttrType::MAPPED_ADDRESS -> MAPPED_ADDRESS: MappedAddress(self.attr_length);
AttrType::USERNAME -> USERNAME: bytes &size=self.attr_length;
AttrType::MESSAGE_INTEGRITY -> HMAC_SHA1: bytes &size=20;
AttrType::ERROR_CODE -> ERROR_CODE: ErrorCode(self.attr_length);
AttrType::UNKNOWN_ATTRIBUTES -> UNKNOWN_ATTRIBUTES: UnknownAttributes(self.attr_length);
#AttrType::CHANNEL_NUMBER -> 0x000C;
#AttrType::LIFETIME -> 0x000D;
#AttrType::XOR_PEER_ADDRESS -> 0x0012;
#AttrType::DATA -> 0x0013;
AttrType::REALM -> bytes &size=self.attr_length;
AttrType::NONCE -> bytes &size=self.attr_length;
#AttrType::XOR_RELAYED_ADDRESS -> 0x0016;
#AttrType::REQUESTED_ADDRESS_FAMILY -> 0x0017;
#AttrType::EVEN_PORT -> 0x0018;
#AttrType::REQUESTED_TRANSPORT -> 0x0019;
#AttrType::DONT_FRAGMENT -> 0x001A;
#AttrType::ACCESS_TOKEN -> 0x001B;
#AttrType::MESSAGE_INTEGRITY_SHA256 -> 0x001C;
#AttrType::PASSWORD_ALGORITHM -> 0x001D;
#AttrType::USERHASH -> 0x001E;
AttrType::XOR_MAPPED_ADDRESS -> XOR_MAPPED_ADDRES: MappedAddress(self.attr_length);
#AttrType::RESERVATION_TOKEN -> 0x0022;
AttrType::PRIORITY -> PRIORITY: bytes &size=4;
AttrType::USE_CANDIDATE -> void;
#AttrType::PADDING -> 0x0026;
#AttrType::RESPONSE_PORT -> 0x0027;
#AttrType::CONNECTION_ID -> 0x002A;
#AttrType::ADDITIONAL_ADDRESS_FAMILY -> 0x8000;
#AttrType::ADDRESS_ERROR_CODE -> 0x8001;
#AttrType::PASSWORD_ALGORITHMS -> 0x8002;
#AttrType::ALTERNATE_DOMAIN -> 0x8003;
#AttrType::ICMP -> 0x8004;
AttrType::SOFTWARE -> DESCRIPTION: bytes &size=self.attr_length;
AttrType::ALTERNATE_SERVER -> ALTERNATE_SERVER: MappedAddress(self.attr_length);
#AttrType::TRANSACTION_TRANSMIT_COUNTER -> 0x8025;
#AttrType::CACHE_TIMEOUT -> 0x8027;
AttrType::FINGERPRINT -> CRC_32: bytes &size=self.attr_length;
AttrType::ICE_CONTROLLED -> ICE_CONTROLLED: bytes &size=self.attr_length;
AttrType::ICE_CONTROLLING -> ICE_CONTROLLING: bytes &size=self.attr_length;
#AttrType::RESPONSE_ORIGIN -> 0x802B;
#AttrType::OTHER_ADDRESS -> 0x802C;
#AttrType::ECN_CHECK -> 0x802D;
#AttrType::THIRD_PARTY_AUTHORIZATION -> 0x802E;
#AttrType::MOBILITY_TICKET -> 0x8030;
#AttrType::CISCO_STUN_FLOWDATA -> 0xC000;
#AttrType::ENF_FLOW_DESCRIPTION -> 0xC001;
#AttrType::ENF_NETWORK_STATUS -> 0xC002;
#AttrType::GOOG_MISC_INFO -> 0xC059;
#AttrType::GOOG_MESSAGE_INTEGRITY_32 -> 0xC05A
* -> attr_value: bytes &size=self.total_size;
};
padding: bytes &size=self.value_padding;
var value_padding: uint16;
var total_size: uint16;
};
# https://tools.ietf.org/html/rfc5389#section-15.1
type MappedAddress = unit(length: uint16) {
nulls: uint8;
family: uint8 &convert=AddrFamily($$);
x_port: uint16;
ipv4: addr &ipv4 if (self.family == AddrFamily::IPv4);
ipv6: addr &ipv6 if (self.family == AddrFamily::IPv6);
};
# https://tools.ietf.org/html/rfc5389#section-15.6
type ErrorCode = unit(length: uint16) {
class: bytes &size=3;
number: uint8;
reason: bytes &size=(length - 4);
};
# https://tools.ietf.org/html/rfc5389#section-15.9
type UnknownAttributes = unit(length: uint16) {
unknowns: uint16[length / 2];
};
function padding(x: uint16): uint16 {
if (x % 4 > 0) {
return 4 - (x % 4);
} else {
return 0;
}
}