static int netbios_parser_ctor(struct netbios_parser *netbios_parser, struct proto *proto)
{
SLOG(LOG_DEBUG, "Constructing netbios_parser@%p", netbios_parser);
assert(proto == proto_netbios);
if (0 != parser_ctor(&netbios_parser->parser, proto)) return -1;
netbios_parser->msg_parser = NULL;
timeval_reset(&netbios_parser->first_packet_tv[0]);
timeval_reset(&netbios_parser->first_packet_tv[1]);
if (0 != streambuf_ctor(&netbios_parser->sbuf, netbios_sbuf_parse, 30000, NULL)) {
parser_dtor(&netbios_parser->parser);
return -1;
}
return 0;
}
static int tns_parser_ctor(struct tns_parser *tns_parser, struct proto *proto)
{
assert(proto == proto_tns);
if (0 != parser_ctor(&tns_parser->parser, proto)) return -1;
tns_parser->c2s_way = UNSET; // unset
tns_parser->nb_fields = UNSET;
tns_parser->msg_type = SQL_UNKNOWN;
timeval_reset(&tns_parser->first_ts);
if (0 != streambuf_ctor(&tns_parser->sbuf, tns_sbuf_parse, 30000, NULL)) return -1;
return 0;
}
static int tds_parser_ctor(struct tds_parser *tds_parser, struct proto *proto)
{
SLOG(LOG_DEBUG, "Constructing tds_parser@%p", tds_parser);
assert(proto == proto_tds);
if (0 != parser_ctor(&tds_parser->parser, proto)) return -1;
tds_parser->msg_parser = NULL;
tds_parser->had_gap = false;
tds_parser->data_left = 0;
tds_parser->channels[0] = 0;
tds_parser->channels[1] = 0;
tds_parser->pkt_number = 1;
timeval_reset(&tds_parser->first_ts);
if (0 != streambuf_ctor(&tds_parser->sbuf, tds_sbuf_parse, 30000, NULL)) {
parser_dtor(&tds_parser->parser);
return -1;
}
return 0;
}
static enum proto_parse_status netbios_parse_frame(struct netbios_parser *netbios_parser,
struct proto_info *parent, unsigned way, uint8_t const *packet, size_t cap_len, size_t wire_len,
struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet, size_t *pos)
{
if (cap_len == 0 && netbios_parser->sbuf.dir[way].cap_len == 0) {
// Ignore pure gap start
timeval_reset(netbios_parser->first_packet_tv + way);
return PROTO_PARSE_ERR;
}
if (cap_len > 0 && !timeval_is_set(&netbios_parser->first_packet_tv[way])) {
SLOG(LOG_DEBUG, "Set first packet ts for way %d to %s", way, timeval_2_str(now));
netbios_parser->first_packet_tv[way] = *now;
}
if (wire_len < NETBIOS_HEADER_SIZE + SMB_FLAG_SIZE) {
streambuf_set_restart(&netbios_parser->sbuf, way, packet, NETBIOS_HEADER_SIZE + SMB_FLAG_SIZE);
return PROTO_OK;
}
if (cap_len < NETBIOS_HEADER_SIZE + SMB_FLAG_SIZE) {
SLOG(LOG_DEBUG, "Got a gap on neccessary bytes");
timeval_reset(netbios_parser->first_packet_tv + way);
return PROTO_PARSE_ERR;
}
if (packet[0] != 0) {
SLOG(LOG_DEBUG, "Expected Session message type 0x00, got 0x%"PRIx8, packet[0]);
timeval_reset(netbios_parser->first_packet_tv + way);
return PROTO_PARSE_ERR;
}
uint32_t smb_version = READ_U32N(packet + NETBIOS_HEADER_SIZE);
if (smb_version != CIFS_SMB_HEADER && smb_version != CIFS_SMB2_HEADER) {
static unsigned char smb_header[SMB_FLAG_SIZE] = {0xff, 0x53, 0x4d, 0x42};
static unsigned char smb2_header[SMB_FLAG_SIZE] = {0xfe, 0x53, 0x4d, 0x42};
void *res = memmem(packet + NETBIOS_HEADER_SIZE, cap_len - NETBIOS_HEADER_SIZE, &smb_header,
SMB_FLAG_SIZE);
if (!res) {
res = memmem(packet + NETBIOS_HEADER_SIZE, cap_len - NETBIOS_HEADER_SIZE, &smb2_header,
SMB_FLAG_SIZE);
}
if (!res) {
SLOG(LOG_DEBUG, "Netbios payload does not expected header (expected %"PRIx32" or %"PRIx32"),"
" got %"PRIx32, CIFS_SMB_HEADER, CIFS_SMB2_HEADER, smb_version);
return PROTO_PARSE_ERR;
}
SLOG(LOG_DEBUG, "Found a SMB header in payload, restarting there");
timeval_reset(netbios_parser->first_packet_tv + way);
streambuf_set_restart(&netbios_parser->sbuf, way, res - NETBIOS_HEADER_SIZE,
NETBIOS_HEADER_SIZE + SMB_FLAG_SIZE);
return PROTO_OK;
}
uint32_t len = READ_U32N((uint32_t*) packet) & 0x00ffffff;
*pos = len;
size_t current_payload = wire_len - NETBIOS_HEADER_SIZE;
SLOG(LOG_DEBUG, "Found netbios payload of %"PRIu32", current payload %zu",
len, current_payload);
if (len > current_payload) {
streambuf_set_restart(&netbios_parser->sbuf, way, packet, len + NETBIOS_HEADER_SIZE);
return PROTO_OK;
}
/* Parse */
struct netbios_proto_info info;
netbios_proto_info_ctor(&info, &netbios_parser->parser, parent,
NETBIOS_HEADER_SIZE, wire_len - NETBIOS_HEADER_SIZE, len,
netbios_parser->first_packet_tv + way);
timeval_reset(netbios_parser->first_packet_tv + way);
SLOG(LOG_DEBUG, "Parsing netbios content");
uint8_t const *next_packet = packet + NETBIOS_HEADER_SIZE;
if (!netbios_parser->msg_parser) {
netbios_parser->msg_parser = proto_cifs->ops->parser_new(proto_cifs);
}
enum proto_parse_status status = PROTO_OK;
if (netbios_parser->msg_parser) {
status = proto_parse(netbios_parser->msg_parser, &info.info,
way, next_packet,
cap_len - NETBIOS_HEADER_SIZE, wire_len - NETBIOS_HEADER_SIZE,
now, tot_cap_len, tot_packet);
if (status == PROTO_OK) return PROTO_OK;
}
(void)proto_parse(NULL, &info.info, way, next_packet, cap_len - NETBIOS_HEADER_SIZE, wire_len - NETBIOS_HEADER_SIZE, now, tot_cap_len, tot_packet);
return status;
}
static enum proto_parse_status tns_sbuf_parse(struct parser *parser, struct proto_info *parent, unsigned way, uint8_t const *payload, size_t cap_len, size_t wire_len, struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet)
{
struct tns_parser *tns_parser = DOWNCAST(parser, parser, tns_parser);
// If this is the first time we are called, init c2s_way
if (tns_parser->c2s_way == UNSET) {
ASSIGN_INFO_OPT(tcp, parent);
if (tcp) tns_parser->c2s_way = tcp->to_srv ? way : !way;
else tns_parser->c2s_way = way;
SLOG(LOG_DEBUG, "First packet, init c2s_way to %u", tns_parser->c2s_way);
}
if (!timeval_is_set(&tns_parser->first_ts)) {
SLOG(LOG_DEBUG, "Setting first ts to %s", timeval_2_str(now));
tns_parser->first_ts = *now;
}
// Now build the proto_info
struct sql_proto_info info;
SLOG(LOG_DEBUG, "Constructing with %zu", wire_len);
proto_info_ctor(&info.info, parser, parent, wire_len, 0);
info.is_query = way == tns_parser->c2s_way;
info.set_values = 0;
info.msg_type = SQL_UNKNOWN;
info.first_ts = tns_parser->first_ts;
// and try to read a TNS PDN
struct cursor cursor;
cursor_ctor(&cursor, payload, cap_len);
uint8_t const *const msg_start = cursor.head;
size_t pdu_len = 0;
enum tns_type pdu_type = 0;
enum proto_parse_status status = cursor_read_tns_hdr(&cursor, &pdu_len, &pdu_type, wire_len);
if (status == PROTO_PARSE_ERR) {
SLOG(LOG_DEBUG, "Error while parsing tns header");
timeval_reset(&tns_parser->first_ts);
return status;
}
bool has_gap = cap_len < wire_len;
if (status == PROTO_TOO_SHORT && !has_gap) {
proto_parse(NULL, parent, way, NULL, 0, 0, now, tot_cap_len, tot_packet);
streambuf_set_restart(&tns_parser->sbuf, way, msg_start, pdu_len > 0 ? pdu_len : 8);
SLOG(LOG_DEBUG, "Payload too short for parsing message, will restart @ %zu", tns_parser->sbuf.dir->restart_offset);
return PROTO_OK;
}
switch (pdu_type) {
case TNS_CONNECT:
info.msg_type = SQL_STARTUP;
status = tns_parse_connect(tns_parser, &info, &cursor);
break;
case TNS_ACCEPT:
info.msg_type = SQL_STARTUP;
status = tns_parse_accept(tns_parser, &info, &cursor);
break;
case TNS_DATA:
status = tns_parse_data(tns_parser, &info, &cursor, way);
break;
case TNS_RESEND:
SLOG(LOG_DEBUG, "Got a tns resend");
break;
case TNS_REFUSE:
case TNS_REDIRECT:
case TNS_ABORT:
case TNS_MARKER:
case TNS_ATTENTION:
case TNS_CONTROL:
default: // A type we do not handle, skip the PDU
break;
}
// We advertize the tns pdu even if we don't know how to parse it
if (status != PROTO_OK) SLOG(LOG_DEBUG, "Error parsing tns packet");
timeval_reset(&tns_parser->first_ts);
return proto_parse(NULL, &info.info, way, NULL, 0, 0, now, tot_cap_len, tot_packet);
}
static enum proto_parse_status tds_sbuf_parse(struct parser *parser, struct proto_info *parent, unsigned way, uint8_t const *payload, size_t cap_len, size_t wire_len, struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet)
{
if (cap_len == 0 && wire_len > 0) return PROTO_TOO_SHORT; // We do not know how to handle pure gaps
struct tds_parser *tds_parser = DOWNCAST(parser, parser, tds_parser);
SLOG(LOG_DEBUG, "Got tds packet, data_left %zu, way %d", tds_parser->data_left, way);
bool has_gap = wire_len > cap_len;
if (tds_parser->had_gap && tds_parser->data_left > 0) {
tds_parser->data_left = wire_len > tds_parser->data_left ? 0 : tds_parser->data_left - wire_len;
SLOG(LOG_DEBUG, "Discard tds with gap, data_left %zu...", tds_parser->data_left);
timeval_reset(&tds_parser->first_ts);
return PROTO_OK;
}
tds_parser->had_gap = has_gap;
struct tds_header tds_header;
bool unknown_token = false;
struct cursor cursor;
enum proto_parse_status status;
cursor_ctor(&cursor, payload, cap_len);
struct smp_header smp_header = {.length = 0};
if (PROTO_OK != (status = tds_parse_smp_header(&cursor, &smp_header))) return status;
if (smp_header.length) {
SLOG(LOG_DEBUG, "Smp header: %s", smp_header_2_str(&smp_header));
wire_len -= SMP_PKT_HDR_LEN;
cap_len -= SMP_PKT_HDR_LEN;
if (smp_header.flags & SMP_ACK) return PROTO_OK;
}
status = tds_parse_header(&cursor, &tds_header, &unknown_token);
if (status != PROTO_OK) {
// We have an unknown token if the payload is encrypted after a ssl handshake
// It is valid but we don't know how to parse it yet
// TODO It would be better if we knew the values of the encryption options exchanged in prelogin messages
timeval_reset(&tds_parser->first_ts);
if (unknown_token) return PROTO_OK;
return status;
}
// Sanity check on pkt number
if (tds_header.pkt_number > 1 && ((tds_parser->pkt_number + 1) != tds_header.pkt_number)) {
SLOG(LOG_DEBUG, "Expected pkt number %"PRIu8", got %"PRIu8"",
tds_parser->pkt_number + 1, tds_header.pkt_number);
tds_parser->pkt_number = 1;
timeval_reset(&tds_parser->first_ts);
return PROTO_PARSE_ERR;
} else if (tds_header.pkt_number <= 1) {
SLOG(LOG_DEBUG, "Reset pkt number from %"PRIu8"", tds_parser->pkt_number);
tds_parser->pkt_number = 1;
}
// Sanity check on channels
if (tds_parser->channels[way] && (tds_parser->channels[way] != tds_header.channel)) {
SLOG(LOG_DEBUG, "Expected channel %"PRIu16", got channel %"PRIu16"",
tds_parser->channels[way], tds_header.channel);
timeval_reset(&tds_parser->first_ts);
return PROTO_PARSE_ERR;
}
if (wire_len > tds_header.len) {
SLOG(LOG_DEBUG, "Wire len %zu unexpected (> %zu), considering a gap", wire_len, tds_header.len);
has_gap = true;
}
tds_parser->data_left = wire_len >= tds_header.len ? 0 : tds_header.len - wire_len;
SLOG(LOG_DEBUG, "Data left after wire %zu", tds_parser->data_left);
if (tds_parser->data_left > 0 && !has_gap) {
SLOG(LOG_DEBUG, "Incomplete tds packet, buffering it");
if (!timeval_is_set(&tds_parser->first_ts)) {
SLOG(LOG_DEBUG, "Setting first ts to %s for way %d", timeval_2_str(now), way);
tds_parser->first_ts = *now;
}
proto_parse(NULL, parent, way, NULL, 0, 0, now, tot_cap_len, tot_packet);
streambuf_set_restart(&tds_parser->sbuf, way, payload, tds_header.len);
return PROTO_OK;
}
// We have a buffered tds packet at this point
if (!timeval_is_set(&tds_parser->first_ts)) {
SLOG(LOG_DEBUG, "Setting first ts to %s for way %d since it is not setted", timeval_2_str(now), way);
tds_parser->first_ts = *now;
}
struct tds_proto_info info;
proto_info_ctor(&info.info, parser, parent, TDS_PKT_HDR_LEN, tds_header.len - TDS_PKT_HDR_LEN);
info.type = tds_header.type;
info.status = tds_header.status;
info.length = tds_header.len;
info.first_ts = tds_parser->first_ts;
info.has_gap = has_gap;
if (tds_header.channel > 0) {
SLOG(LOG_DEBUG, "Saving channel %"PRIu16"", tds_header.channel);
tds_parser->channels[way] = tds_header.channel;
}
SLOG(LOG_DEBUG, "Saving pkt number %"PRIu8"", tds_header.pkt_number);
tds_parser->pkt_number = tds_header.pkt_number;
SLOG(LOG_DEBUG, "Parsing %s", tds_header_2_str(&tds_header));
if (! tds_parser->msg_parser) {
SLOG(LOG_DEBUG, "Building new tds_msg_parser");
tds_parser->msg_parser = proto_tds_msg->ops->parser_new(proto_tds_msg);
if (!tds_parser->msg_parser) {
SLOG(LOG_INFO, "Could not build tds msg parser");
return PROTO_PARSE_ERR;
}
}
if (tds_header.status & TDS_EOM) {
SLOG(LOG_DEBUG, "Reset pkt number from %"PRIu8" since we parsed an EOM", tds_parser->pkt_number);
tds_parser->pkt_number = 1;
}
status = proto_parse(tds_parser->msg_parser, &info.info, way,
cursor.head, cursor.cap_len, wire_len - TDS_PKT_HDR_LEN, now, tot_cap_len, tot_packet);
if (status != PROTO_OK) {
SLOG(LOG_INFO, "Tds msg parse failed, returning %s", proto_parse_status_2_str(status));
return status;
}
timeval_reset(&tds_parser->first_ts);
// Advertise this packet if it was not done already
return proto_parse(NULL, &info.info, way, payload, cap_len, wire_len, now, tot_cap_len, tot_packet);
}
static enum proto_parse_status tds_parse(struct parser *parser, struct proto_info *parent, unsigned way, uint8_t const *payload, size_t cap_len, size_t wire_len, struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet)
{
struct tds_parser *tds_parser = DOWNCAST(parser, parser, tds_parser);
enum proto_parse_status const status = streambuf_add(&tds_parser->sbuf, parser, parent, way, payload, cap_len, wire_len, now, tot_cap_len, tot_packet);
return status;
}
/*
* Construction/Destruction
*/
static struct proto proto_tds_;
struct proto *proto_tds = &proto_tds_;
static struct port_muxer tds_tcp_muxer;
void tds_init(void)
{
log_category_proto_tds_init();
static struct proto_ops const ops = {
.parse = tds_parse,
.parser_new = tds_parser_new,
.parser_del = tds_parser_del,
.info_2_str = tds_info_2_str,
.info_addr = tds_info_addr
};
proto_ctor(&proto_tds_, &ops, "TDS", PROTO_CODE_TDS);
port_muxer_ctor(&tds_tcp_muxer, &tcp_port_muxers, 1433, 1433, proto_tds);
}
