diff options
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/protocols/quic.c | 182 |
1 files changed, 112 insertions, 70 deletions
diff --git a/src/lib/protocols/quic.c b/src/lib/protocols/quic.c index c194b0aec..a538a21e3 100644 --- a/src/lib/protocols/quic.c +++ b/src/lib/protocols/quic.c @@ -23,14 +23,26 @@ #include "ndpi_api.h" -#define SEQ_CID_MASK_ALL 0x3c // 0011 1100 -#define QUIC_VER_MASK 0x01 // 0000 0001 -#define CID_LEN_8 0x0C // 0000 1100 -#define CID_LEN_4 0x08 // 0000 1000 -#define CID_LEN_1 0x04 // 0000 0100 -#define CID_LEN_0 0x00 // 0000 0000 -#define SEQ_MASK 0xf3 // 1111 0011 -#define CID_MASK 0x0C // 0000 1100 +#define QUIC_NO_V_RES_RSV 0xf3 // 1100 0011 + +#define QUIC_CID_MASK 0x0C // 0000 1100 +#define QUIC_VER_MASK 0x01 // 0000 0001 +#define QUIC_SEQ_MASK 0x30 // 0011 0000 + +#define CID_LEN_8 0x0C // 0000 1100 +#define CID_LEN_4 0x08 // 0000 1000 +#define CID_LEN_1 0x04 // 0000 0100 +#define CID_LEN_0 0x00 // 0000 0000 + +#define SEQ_LEN_6 0x30 // 0011 0000 +#define SEQ_LEN_4 0x20 // 0010 0000 +#define SEQ_LEN_2 0x10 // 0001 0000 +#define SEQ_LEN_1 0x00 // 0000 0000 + +#define SEQ_CONV_6(ARR) (ARR[0] | ARR[1] | ARR[2] | ARR[3] | ARR[4] | ARR[5] << 8) +#define SEQ_CONV_4(ARR) (ARR[0] | ARR[1] | ARR[2] | ARR[3] << 8) +#define SEQ_CONV_2(ARR) (ARR[0] | ARR[1] << 8) +#define SEQ_CONV_1(ARR) (ARR[0] << 8) #ifdef NDPI_PROTOCOL_QUIC @@ -40,89 +52,119 @@ static void ndpi_int_quic_add_connection(struct ndpi_detection_module_struct ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_QUIC, NDPI_REAL_PROTOCOL); } +int connect_id(const unsigned char pflags) +{ + u_int cid_len; + + // Check CID length. + switch (pflags & QUIC_CID_MASK) + { + case CID_LEN_8: cid_len = 8; break; + case CID_LEN_4: cid_len = 4; break; + case CID_LEN_1: cid_len = 1; break; + case CID_LEN_0: cid_len = 0; break; + default: + return -1; + + } + // Return offset. + return cid_len + 1; +} + +int sequence(const unsigned char *payload) +{ + unsigned char* conv; + u_int seq_len; + u_int cid_offs; + u_int seq_value; + int i; + + switch (payload[0] & QUIC_SEQ_MASK) + { + case SEQ_LEN_6: seq_len = 6; break; + case SEQ_LEN_4: seq_len = 4; break; + case SEQ_LEN_2: seq_len = 2; break; + case SEQ_LEN_1: seq_len = 1; break; + default: + return -1; + } + + if (seq_len > 0) calloc(seq_len, sizeof(unsigned char)); + cid_offs = connect_id(payload[0]); + + if (cid_offs >= 0) + { + for (i = cid_offs; i < seq_len; i++) + conv[i] = payload[i]; + + switch (seq_len) + { + case 6: seq_value = SEQ_CONV_6(conv); break; + case 4: seq_value = SEQ_CONV_4(conv); break; + case 2: seq_value = SEQ_CONV_2(conv); break; + case 1: seq_value = SEQ_CONV_1(conv); break; + default: + return -1; + } + // Return SEQ int value; + return seq_value; + } +} + void ndpi_search_quic(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) { struct ndpi_packet_struct *packet = &flow->packet; u_int16_t dport = 0, sport = 0; u_int ver_offs; - u_int seq_offs; - u_int cid_len; - if(packet->udp != NULL) { + if(packet->udp != NULL) { sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest); NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "calculating quic over udp.\n"); - // Settings without version. First check if 0x00 PUBLIC FLAGS and SEQ != 0x00. SEQ must be 1 at least. + // Settings without version. First check if PUBLIC FLAGS & SEQ bytes are 0x0. SEQ must be 1 at least. if ((sport == 80 || dport == 80 || sport == 443 || dport == 443) && ((packet->payload[0] == 0x00 && packet->payload[1] != 0x00) || - (packet->payload[0] & SEQ_CID_MASK_ALL))) + (packet->payload[0] & (QUIC_NO_V_RES_RSV) == 0))) { - // Filter packets with 1 byte SEQ. - if (packet->payload[0] & SEQ_MASK == 0) + if (sequence(packet->payload) < 1) { - // Has no version, 1 byte SEQ. - // Check CID length. - switch (packet->payload[0] & CID_MASK) - { - case CID_LEN_8: cid_len = 8; break; - case CID_LEN_4: cid_len = 4; break; - case CID_LEN_1: cid_len = 1; break; - case CID_LEN_0: cid_len = 0; break; - default: - NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n"); - NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC); - } - - seq_offs = cid_len + 1; - // SEQ must be 1 at least. - if(packet->payload[seq_offs] == 0) - { - NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n"); - NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC); - } + NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n"); + NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC); } NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n"); ndpi_int_quic_add_connection(ndpi_struct, flow); + } // Check if version, than the CID length. - } else if (packet->payload[0] & QUIC_VER_MASK) + else if (packet->payload[0] & QUIC_VER_MASK) { - // Has version, check CID length. - switch (packet->payload[0] & CID_MASK) - { - case CID_LEN_8: cid_len = 8; break; - case CID_LEN_4: cid_len = 4; break; - case CID_LEN_1: cid_len = 1; break; - case CID_LEN_0: cid_len = 0; break; - default: - NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n"); - NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC); - } - // Skip CID length. - ver_offs = cid_len + 1; - unsigned char vers[] = {packet->payload[ver_offs], packet->payload[ver_offs + 1], - packet->payload[ver_offs + 2], packet->payload[ver_offs + 3]}; - - // Check version match. - if (vers[0] == 'Q' && vers[1] == '0' && - (vers[2] == '2' && (vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' || - vers[3] == '1' || vers[3] == '0')) || - (vers[2] == '1' && (vers[3] == '9' || vers[3] == '8' || vers[3] == '7' || vers[3] == '6' || - vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' || - vers[3] == '1' || vers[3] == '0')) || - (vers[2] == '0' && vers[3] == '9')) - - { - NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n"); - ndpi_int_quic_add_connection(ndpi_struct, flow); - } - } else - { - NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n"); - NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC); + ver_offs = connect_id(packet->payload[0]); + + if (ver_offs >= 0){ + unsigned char vers[] = {packet->payload[ver_offs], packet->payload[ver_offs + 1], + packet->payload[ver_offs + 2], packet->payload[ver_offs + 3]}; + + // Version Match. + if (vers[0] == 'Q' && vers[1] == '0' && + (vers[2] == '2' && (vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' || + vers[3] == '1' || vers[3] == '0')) || + (vers[2] == '1' && (vers[3] == '9' || vers[3] == '8' || vers[3] == '7' || vers[3] == '6' || + vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' || + vers[3] == '1' || vers[3] == '0')) || + (vers[2] == '0' && vers[3] == '9')) + + { + NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n"); + ndpi_int_quic_add_connection(ndpi_struct, flow); + } } + } else + { + NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n"); + NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC); } - } + } +} #endif |