diff options
Diffstat (limited to 'src/lib/protocols')
| -rw-r--r-- | src/lib/protocols/socks.c | 155 | ||||
| -rw-r--r-- | src/lib/protocols/socks4.c | 96 | ||||
| -rw-r--r-- | src/lib/protocols/socks5.c | 92 |
3 files changed, 155 insertions, 188 deletions
diff --git a/src/lib/protocols/socks.c b/src/lib/protocols/socks.c new file mode 100644 index 000000000..7ad0868d2 --- /dev/null +++ b/src/lib/protocols/socks.c @@ -0,0 +1,155 @@ +/* + * socks4.c + * + * Copyright (C) 2016 - ntop.org + * Copyright (C) 2014 Tomasz Bujlow <tomasz@skatnet.dk> + * + * The signature is based on the Libprotoident library. + * + * This file is part of nDPI, an open source deep packet inspection + * library based on the OpenDPI and PACE technology by ipoque GmbH + * + * nDPI is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * nDPI is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with nDPI. If not, see <http://www.gnu.org/licenses/>. + * + */ + + +#include "ndpi_api.h" + +#ifdef NDPI_PROTOCOL_SOCKS +static void ndpi_int_socks_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) +{ + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_SOCKS, NDPI_PROTOCOL_UNKNOWN); +} + +static void ndpi_check_socks4(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) +{ + struct ndpi_packet_struct *packet = &flow->packet; + u_int32_t payload_len = packet->payload_packet_len; + + /* Break after 20 packets. */ + if(flow->packet_counter > 20) { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "Exclude SOCKS4.\n"); + NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SOCKS); + return; + } + + /* Check if we so far detected the protocol in the request or not. */ + if(flow->socks4_stage == 0) { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS4 stage 0: \n"); + + /*Octets 3 and 4 contain the port number, port 80 and 25 for now. */ + if((payload_len == 9) && + (((packet->payload[0] == 0x04) && (packet->payload[1] == 0x01) && (packet->payload[2] == 0x00) && (packet->payload[3] == 0x50)) + || + ((packet->payload[0] == 0x04) && (packet->payload[1] == 0x01) && (packet->payload[2] == 0x00) && (packet->payload[3] == 0x19)))) { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "Possible SOCKS4 request detected, we will look further for the response...\n"); + + /* Encode the direction of the packet in the stage, so we will know when we need to look for the response packet. */ + flow->socks4_stage = packet->packet_direction + 1; + } + + } else { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS4 stage %u: \n", flow->socks4_stage); + + /* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */ + if((flow->socks4_stage - packet->packet_direction) == 1) { + return; + } + + /* This is a packet in another direction. Check if we find the proper response. */ + if(payload_len == 0) { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "Found SOCKS4.\n"); + ndpi_int_socks_add_connection(ndpi_struct, flow); + } else { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "The reply did not seem to belong to SOCKS4, resetting the stage to 0...\n"); + flow->socks4_stage = 0; + } + + } +} + +static void ndpi_check_socks5(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) +{ + struct ndpi_packet_struct *packet = &flow->packet; + u_int32_t payload_len = packet->payload_packet_len; + + /* Break after 20 packets. */ + if(flow->packet_counter > 20) { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "Exclude SOCKS5.\n"); + NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SOCKS); + return; + } + + /* Check if we so far detected the protocol in the request or not. */ + if(flow->socks5_stage == 0) { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS5 stage 0: \n"); + + if((payload_len == 3) && (packet->payload[0] == 0x05) && (packet->payload[1] == 0x01) && (packet->payload[2] == 0x00)) { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "Possible SOCKS5 request detected, we will look further for the response...\n"); + + /* Encode the direction of the packet in the stage, so we will know when we need to look for the response packet. */ + flow->socks5_stage = packet->packet_direction + 1; + } + + } else { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS5 stage %u: \n", flow->socks5_stage); + + /* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */ + if((flow->socks5_stage - packet->packet_direction) == 1) { + return; + } + + /* This is a packet in another direction. Check if we find the proper response. */ + if((payload_len == 0) || ((payload_len == 2) && (packet->payload[0] == 0x05) && (packet->payload[1] == 0x00))) { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "Found SOCKS5.\n"); + ndpi_int_socks_add_connection(ndpi_struct, flow); + } else { + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "The reply did not seem to belong to SOCKS5, resetting the stage to 0...\n"); + flow->socks5_stage = 0; + } + + } +} + +void ndpi_search_socks(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) +{ + struct ndpi_packet_struct *packet = &flow->packet; + + NDPI_LOG(NDPI_PROTOCOL_SOCKS, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS detection...\n"); + + /* skip marked packets */ + if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_SOCKS) { + if(packet->tcp_retransmission == 0) { + ndpi_check_socks4(ndpi_struct, flow); + + if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_SOCKS) + ndpi_check_socks5(ndpi_struct, flow); + } + } +} + +void init_socks_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask) +{ + ndpi_set_bitmask_protocol_detection("SOCKS", ndpi_struct, detection_bitmask, *id, + NDPI_PROTOCOL_SOCKS, + ndpi_search_socks, + NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION, + SAVE_DETECTION_BITMASK_AS_UNKNOWN, + ADD_TO_DETECTION_BITMASK); + + *id += 1; +} + +#endif diff --git a/src/lib/protocols/socks4.c b/src/lib/protocols/socks4.c deleted file mode 100644 index 87bc3a634..000000000 --- a/src/lib/protocols/socks4.c +++ /dev/null @@ -1,96 +0,0 @@ -/* - * socks4.c - * - * Copyright (C) 2014 Tomasz Bujlow <tomasz@skatnet.dk> - * - * The signature is based on the Libprotoident library. - * - * This file is part of nDPI, an open source deep packet inspection - * library based on the OpenDPI and PACE technology by ipoque GmbH - * - * nDPI is free software: you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * nDPI is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public License - * along with nDPI. If not, see <http://www.gnu.org/licenses/>. - * - */ - - -#include "ndpi_api.h" - -#ifdef NDPI_PROTOCOL_SOCKS4 -static void ndpi_int_socks4_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) -{ - ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_SOCKS4, NDPI_PROTOCOL_UNKNOWN); -} - -static void ndpi_check_socks4(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) -{ - struct ndpi_packet_struct *packet = &flow->packet; - u_int32_t payload_len = packet->payload_packet_len; - - /* Break after 20 packets. */ - if (flow->packet_counter > 20) { - NDPI_LOG(NDPI_PROTOCOL_SOCKS4, ndpi_struct, NDPI_LOG_DEBUG, "Exclude SOCKS4.\n"); - NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SOCKS4); - return; - } - - /* Check if we so far detected the protocol in the request or not. */ - if (flow->socks4_stage == 0) { - NDPI_LOG(NDPI_PROTOCOL_SOCKS4, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS4 stage 0: \n"); - - /*Octets 3 and 4 contain the port number, port 80 and 25 for now. */ - if ((payload_len == 9) && - (((packet->payload[0] == 0x04) && (packet->payload[1] == 0x01) && (packet->payload[2] == 0x00) && (packet->payload[3] == 0x50)) - || - ((packet->payload[0] == 0x04) && (packet->payload[1] == 0x01) && (packet->payload[2] == 0x00) && (packet->payload[3] == 0x19)))) { - NDPI_LOG(NDPI_PROTOCOL_SOCKS4, ndpi_struct, NDPI_LOG_DEBUG, "Possible SOCKS4 request detected, we will look further for the response...\n"); - - /* Encode the direction of the packet in the stage, so we will know when we need to look for the response packet. */ - flow->socks4_stage = packet->packet_direction + 1; - } - - } else { - NDPI_LOG(NDPI_PROTOCOL_SOCKS4, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS4 stage %u: \n", flow->socks4_stage); - - /* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */ - if ((flow->socks4_stage - packet->packet_direction) == 1) { - return; - } - - /* This is a packet in another direction. Check if we find the proper response. */ - if (payload_len == 0) { - NDPI_LOG(NDPI_PROTOCOL_SOCKS4, ndpi_struct, NDPI_LOG_DEBUG, "Found SOCKS4.\n"); - ndpi_int_socks4_add_connection(ndpi_struct, flow); - } else { - NDPI_LOG(NDPI_PROTOCOL_SOCKS4, ndpi_struct, NDPI_LOG_DEBUG, "The reply did not seem to belong to SOCKS4, resetting the stage to 0...\n"); - flow->socks4_stage = 0; - } - - } -} - -void ndpi_search_socks4(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) -{ - struct ndpi_packet_struct *packet = &flow->packet; - - NDPI_LOG(NDPI_PROTOCOL_SOCKS4, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS4 detection...\n"); - - /* skip marked packets */ - if (packet->detected_protocol_stack[0] != NDPI_PROTOCOL_SOCKS4) { - if (packet->tcp_retransmission == 0) { - ndpi_check_socks4(ndpi_struct, flow); - } - } -} - -#endif diff --git a/src/lib/protocols/socks5.c b/src/lib/protocols/socks5.c deleted file mode 100644 index f7cf89dfc..000000000 --- a/src/lib/protocols/socks5.c +++ /dev/null @@ -1,92 +0,0 @@ -/* - * socks5.c - * - * Copyright (C) 2014 Tomasz Bujlow <tomasz@skatnet.dk> - * - * The signature is based on the Libprotoident library. - * - * This file is part of nDPI, an open source deep packet inspection - * library based on the OpenDPI and PACE technology by ipoque GmbH - * - * nDPI is free software: you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * nDPI is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public License - * along with nDPI. If not, see <http://www.gnu.org/licenses/>. - * - */ - - -#include "ndpi_api.h" - -#ifdef NDPI_PROTOCOL_SOCKS5 -static void ndpi_int_socks5_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) -{ - ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_SOCKS5, NDPI_PROTOCOL_UNKNOWN); -} - -static void ndpi_check_socks5(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) -{ - struct ndpi_packet_struct *packet = &flow->packet; - u_int32_t payload_len = packet->payload_packet_len; - - /* Break after 20 packets. */ - if (flow->packet_counter > 20) { - NDPI_LOG(NDPI_PROTOCOL_SOCKS5, ndpi_struct, NDPI_LOG_DEBUG, "Exclude SOCKS5.\n"); - NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SOCKS5); - return; - } - - /* Check if we so far detected the protocol in the request or not. */ - if (flow->socks5_stage == 0) { - NDPI_LOG(NDPI_PROTOCOL_SOCKS5, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS5 stage 0: \n"); - - if ((payload_len == 3) && (packet->payload[0] == 0x05) && (packet->payload[1] == 0x01) && (packet->payload[2] == 0x00)) { - NDPI_LOG(NDPI_PROTOCOL_SOCKS5, ndpi_struct, NDPI_LOG_DEBUG, "Possible SOCKS5 request detected, we will look further for the response...\n"); - - /* Encode the direction of the packet in the stage, so we will know when we need to look for the response packet. */ - flow->socks5_stage = packet->packet_direction + 1; - } - - } else { - NDPI_LOG(NDPI_PROTOCOL_SOCKS5, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS5 stage %u: \n", flow->socks5_stage); - - /* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */ - if ((flow->socks5_stage - packet->packet_direction) == 1) { - return; - } - - /* This is a packet in another direction. Check if we find the proper response. */ - if ((payload_len == 0) || ((payload_len == 2) && (packet->payload[0] == 0x05) && (packet->payload[1] == 0x00))) { - NDPI_LOG(NDPI_PROTOCOL_SOCKS5, ndpi_struct, NDPI_LOG_DEBUG, "Found SOCKS5.\n"); - ndpi_int_socks5_add_connection(ndpi_struct, flow); - } else { - NDPI_LOG(NDPI_PROTOCOL_SOCKS5, ndpi_struct, NDPI_LOG_DEBUG, "The reply did not seem to belong to SOCKS5, resetting the stage to 0...\n"); - flow->socks5_stage = 0; - } - - } -} - -void ndpi_search_socks5(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) -{ - struct ndpi_packet_struct *packet = &flow->packet; - - NDPI_LOG(NDPI_PROTOCOL_SOCKS5, ndpi_struct, NDPI_LOG_DEBUG, "SOCKS5 detection...\n"); - - /* skip marked packets */ - if (packet->detected_protocol_stack[0] != NDPI_PROTOCOL_SOCKS5) { - if (packet->tcp_retransmission == 0) { - ndpi_check_socks5(ndpi_struct, flow); - } - } -} - -#endif |