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ja4plus.c
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/* ja4plus.c -- ja4+ implementation
*
* Copyright 2023 AOL Inc. All rights reserved.
* Portions Copyright 2023 FoxIO
*
* SPDX-License-Identifier: FoxIO License 1.1
*
* This software requires a license to use. See
* https://github.com/FoxIO-LLC/ja4#licensing
* https://github.com/FoxIO-LLC/ja4/blob/main/License%20FAQ.md
*/
#include "arkime.h"
#include "../parsers/ssh_info.h"
#include <math.h>
extern ArkimeConfig_t config;
LOCAL int ja4sField;
LOCAL int ja4sRawField;
LOCAL int ja4sshField;
LOCAL int ja4lField;
LOCAL int ja4lsField;
LOCAL int ja4tField;
LOCAL int ja4tsField;
LOCAL int ja4hField;
LOCAL int ja4hRawField;
LOCAL int ja4plus_plugin_num;
LOCAL GChecksum *checksums256[ARKIME_MAX_PACKET_THREADS];
extern uint8_t arkime_char_to_hexstr[256][3];
LOCAL gboolean ja4Raw;
#define JA4PLUS_SYN_ACK_COUNT 4
typedef struct {
// Used for JA4L
// Timestamps are reference against firstPacket
uint32_t timestampA;
//timestampB = synAckTimes[synAckTimesCnt - 1]
uint32_t timestampC;
uint32_t timestampD;
uint32_t timestampE;
uint32_t synAckTimes[JA4PLUS_SYN_ACK_COUNT];
uint8_t client_ttl;
uint8_t server_ttl;
uint8_t synAckTimesCnt: 3;
} JA4PlusTCP_t;
typedef struct {
GString *header_value; // current header value
GString *header_fields;
uint16_t cookies;
uint16_t referer;
uint16_t headers;
char state;
gchar *sorted_cookie_fields;
gchar *sorted_cookie_values;
gchar accept_lang[4];
} JA4PlusHTTP_t;
#define JA4PLUS_TCP_DONE (void *)1UL
typedef struct {
JA4PlusTCP_t *tcp;
JA4PlusHTTP_t *http;
} JA4PlusData_t;
typedef struct {
char *field;
char *value;
uint16_t flen;
uint16_t vlen;
} JA4PlusCookie_t;
#define TIMESTAMP_TO_RUSEC(ts) (ts.tv_sec - session->firstPacket.tv_sec) * 1000000 + (ts.tv_usec - session->firstPacket.tv_usec)
/******************************************************************************/
LOCAL int cookie_cmp(const void *a, const void *b)
{
return strcmp(((JA4PlusCookie_t *)a)->field, ((JA4PlusCookie_t *)b)->field);
}
/******************************************************************************/
/* Actually process the cookie/accept-language header that has been saved up. */
LOCAL void ja4plus_http_process_headers (ArkimeSession_t *session)
{
JA4PlusData_t *ja4plus_data = (JA4PlusData_t *) session->pluginData[ja4plus_plugin_num];
JA4PlusHTTP_t *ja4_http = ja4plus_data->http;
if (ja4_http->state == 'c') {
int num = 0;
JA4PlusCookie_t cookies[100];
const char *start = ja4_http->header_value->str;
const char *end = start + ja4_http->header_value->len;
uint32_t totalFlen = 0;
uint32_t totalVlen = 0;
while (start < end) {
while (start < end && isspace(*start)) start++;
char *equal = memchr(start, '=', end - start);
if (!equal)
break;
uint32_t flen = equal - start;
cookies[num].field = g_strndup(start, flen); // COPY
cookies[num].flen = flen;
totalFlen += flen;
start = memchr(equal + 1, ';', end - (equal + 1));
equal++;
while (equal < end && isspace(*equal)) equal++;
if (equal < end && equal != start) {
int vlen = start ? start - equal : end - equal;
cookies[num].vlen = vlen;
totalVlen += vlen;
cookies[num].value = equal; // NO COPY
} else {
cookies[num].value = 0;
cookies[num].vlen = 0;
}
num++;
if (num == 99)
break;
if (!start)
break;
start++;
}
ja4_http->cookies = num;
if (num > 0) {
qsort(cookies, num, sizeof(JA4PlusCookie_t), cookie_cmp);
g_free(ja4_http->sorted_cookie_fields);
ja4_http->sorted_cookie_fields = g_malloc(totalFlen + num);
g_free(ja4_http->sorted_cookie_values);
ja4_http->sorted_cookie_values = g_malloc(totalFlen + num + totalVlen + num);
char *fpos = ja4_http->sorted_cookie_fields;
char *fvpos = ja4_http->sorted_cookie_values;
for (int i = 0; i < num; i++) {
memcpy(fpos, cookies[i].field, cookies[i].flen);
fpos += cookies[i].flen;
*(fpos++) = ',';
memcpy(fvpos, cookies[i].field, cookies[i].flen);
fvpos += cookies[i].flen;
if (cookies[i].value) {
*(fvpos++) = '=';
memcpy(fvpos, cookies[i].value, cookies[i].vlen);
fvpos += cookies[i].vlen;
}
*(fvpos++) = ',';
}
*(fpos - 1) = 0;
*(fvpos - 1) = 0;
for (int i = 0; i < num; i++) {
g_free(cookies[i].field);
}
}
} else if (ja4_http->state == 'a') {
const char *lang = ja4_http->header_value->str;
size_t l = 0, a = 0;;
while (l < ja4_http->header_value->len && a < 4) {
if (isspace(lang[l]) || lang[l] == '-') {
l++;
continue;
} else if (lang[l] == ',' || lang[l] == ';') {
break;
}
ja4_http->accept_lang[a] = tolower(lang[l]);
a++;
l++;
}
}
ja4_http->state = 0;
g_string_truncate(ja4_http->header_value, 0);
}
/******************************************************************************/
/* An http msg is complete, process the headers and create the ja4h */
LOCAL void ja4plus_http_complete(ArkimeSession_t *session, http_parser *parser)
{
if (parser->type != 0)
return;
JA4PlusData_t *ja4plus_data = (JA4PlusData_t *) session->pluginData[ja4plus_plugin_num];
if (!ja4plus_data)
return;
JA4PlusHTTP_t *ja4_http = ja4plus_data->http;
if (!ja4_http)
return;
char ja4h[52];
if (!ja4_http->header_fields)
return;
if (ja4_http->state != 0) {
ja4plus_http_process_headers(session);
}
char *method = g_ascii_strdown(http_method_str(parser->method), 2);
GChecksum *const checksum = checksums256[session->thread];
snprintf(ja4h, sizeof(ja4h), "%s%d%d%c%c%02d%4.4s_",
method,
parser->http_major,
parser->http_minor,
(ja4_http->cookies == 0) ? 'n' : 'c',
(ja4_http->referer == 0) ? 'n' : 'r',
ja4_http->headers,
ja4_http->accept_lang
);
g_checksum_update(checksum, (guchar *)ja4_http->header_fields->str, ja4_http->header_fields->len);
memcpy(ja4h + 13, g_checksum_get_string(checksum), 12);
g_checksum_reset(checksum);
ja4h[25] = '_';
if (ja4_http->cookies) {
g_checksum_update(checksum, (guchar *) ja4_http->sorted_cookie_fields, strlen(ja4_http->sorted_cookie_fields));
memcpy(ja4h + 26, g_checksum_get_string(checksum), 12);
g_checksum_reset(checksum);
ja4h[38] = '_';
g_checksum_update(checksum, (guchar *) ja4_http->sorted_cookie_values, strlen(ja4_http->sorted_cookie_values));
memcpy(ja4h + 39, g_checksum_get_string(checksum), 12);
g_checksum_reset(checksum);
} else {
g_strlcpy(ja4h + 26, "000000000000_000000000000", sizeof(ja4h) - 26);
}
ja4h[51] = 0;
arkime_field_string_add(ja4hField, session, ja4h, 51, TRUE);
if (ja4Raw) {
char ja4h_r[1024];
snprintf(ja4h_r, sizeof(ja4h_r), "%s%d%d%c%c%02d%4.4s_%s_%s_%s",
method,
parser->http_major,
parser->http_minor,
(ja4_http->cookies == 0) ? 'n' : 'c',
(ja4_http->referer == 0) ? 'n' : 'r',
ja4_http->headers,
ja4_http->accept_lang,
ja4_http->header_fields->str,
(ja4_http->sorted_cookie_fields != NULL) ? ja4_http->sorted_cookie_fields : "",
(ja4_http->sorted_cookie_values != NULL) ? ja4_http->sorted_cookie_values : ""
);
ja4h_r[sizeof(ja4h_r) - 1] = 0;
arkime_field_string_add(ja4hRawField, session, ja4h_r, -1, TRUE);
}
g_free(method);
g_string_truncate(ja4_http->header_fields, 0);
g_free(ja4_http->sorted_cookie_fields);
ja4_http->sorted_cookie_fields = 0;
g_free(ja4_http->sorted_cookie_values);
ja4_http->sorted_cookie_values = 0;
// Reset
ja4_http->state = 0;
memcpy(ja4_http->accept_lang, "0000", 4);
ja4_http->cookies = 0;
ja4_http->referer = 0;
ja4_http->headers = 0;
}
/******************************************************************************/
LOCAL void ja4plus_http_header_field_raw (ArkimeSession_t *session, http_parser *hp, const char *at, size_t length)
{
if (!at || hp->type != 0)
return;
JA4PlusData_t *ja4plus_data = (JA4PlusData_t *) session->pluginData[ja4plus_plugin_num];
if (!ja4plus_data) {
ja4plus_data = session->pluginData[ja4plus_plugin_num] = ARKIME_TYPE_ALLOC0 (JA4PlusData_t);
}
JA4PlusHTTP_t *ja4_http = ja4plus_data->http;
if (!ja4plus_data->http) {
ja4_http = ja4plus_data->http = ARKIME_TYPE_ALLOC0 (JA4PlusHTTP_t);
ja4_http->header_value = g_string_sized_new(100);
ja4_http->header_fields = g_string_sized_new(100);
memcpy(ja4_http->accept_lang, "0000", 4);
}
if (ja4_http->state != 0) {
ja4plus_http_process_headers(session);
}
char *header_field = g_ascii_strdown(at, length);
if (strcmp(header_field, "cookie") == 0) {
ja4_http->state = 'c';
} else if (strcmp(header_field, "referer") == 0) {
ja4_http->referer = 1;
} else {
if (ja4_http->headers > 0) {
g_string_append_len(ja4_http->header_fields, ",", 1);
}
g_string_append_len(ja4_http->header_fields, at, length);
ja4_http->headers++;
if (strcmp(header_field, "accept-language") == 0) {
ja4_http->state = 'a';
} else {
ja4_http->state = 0;
}
}
g_free(header_field);
}
/******************************************************************************/
/* New partial value is coming in, append it to the current value if we are in a cookie/accept-language */
LOCAL void ja4plus_http_header_value (ArkimeSession_t *session, http_parser *hp, const char *at, size_t length)
{
if (!at || hp->type != 0)
return;
JA4PlusData_t *ja4plus_data = (JA4PlusData_t *) session->pluginData[ja4plus_plugin_num];
JA4PlusHTTP_t *ja4_http = ja4plus_data->http;
if (ja4_http->state == 0)
return;
g_string_append_len(ja4_http->header_value, at, length);
}
/******************************************************************************/
// https://tools.ietf.org/html/draft-davidben-tls-grease-00
LOCAL int ja4plus_is_grease_value(uint32_t val)
{
if ((val & 0x0f) != 0x0a)
return 0;
if ((val & 0xff) != ((val >> 8) & 0xff))
return 0;
return 1;
}
/******************************************************************************/
LOCAL void ja4plus_ja4_version(uint16_t ver, char dtls, char vstr[3])
{
switch (ver) {
case 0x0002:
memcpy(vstr, "s2", 3);
break;
case 0x0300:
memcpy(vstr, "s3", 3);
break;
case 0x0301:
memcpy(vstr, "10", 3);
break;
case 0x0302:
memcpy(vstr, "11", 3);
break;
case 0x0303:
memcpy(vstr, "12", 3);
break;
case 0x0304:
memcpy(vstr, "13", 3);
break;
case 0xfeff:
if (dtls)
memcpy(vstr, "d1", 3);
else
memcpy(vstr, "00", 3);
break;
case 0xfefd:
if (dtls)
memcpy(vstr, "d2", 3);
else
memcpy(vstr, "00", 3);
break;
case 0xfefc:
if (dtls)
memcpy(vstr, "d3", 3);
else
memcpy(vstr, "00", 3);
break;
default:
memcpy(vstr, "00", 3);
break;
}
}
/******************************************************************************/
LOCAL void ja4plus_2digit_to_string(int val, char *str)
{
if (val >= 99) {
str[0] = '9';
str[1] = '9';
return;
}
str[0] = (val / 10) + '0';
str[1] = (val % 10) + '0';
}
/******************************************************************************/
LOCAL void ja4plus_alpn_to_ja4alpn(const uint8_t *alpn, int len, uint8_t *ja4alpn)
{
if (len == 0)
return;
len--; // len now the offset of last byte, which could be 0
if (isalnum(alpn[0]) && isalnum(alpn[len])) {
ja4alpn[0] = tolower(alpn[0]);
ja4alpn[1] = tolower(alpn[len]);
} else {
ja4alpn[0] = arkime_char_to_hexstr[alpn[0]][0];
ja4alpn[1] = arkime_char_to_hexstr[alpn[len]][1];
}
}
/******************************************************************************/
LOCAL uint32_t ja4plus_dtls_process_server_hello(ArkimeSession_t *session, const uint8_t *data, int len, void UNUSED(*uw))
{
// https://github.com/FoxIO-LLC/ja4/blob/main/technical_details/JA4S.md
uint8_t ja4NumExtensions = 0;
uint16_t ja4Extensions[256];
uint8_t ja4ALPN[2] = {'0', '0'};
BSB bsb;
BSB_INIT(bsb, data, len);
uint16_t ver = 0;
uint16_t supportedver;
BSB_IMPORT_u16(bsb, ver);
supportedver = ver;
BSB_IMPORT_skip(bsb, 32); // Random
if (BSB_IS_ERROR(bsb))
return -1;
int skiplen = 0;
BSB_IMPORT_u08(bsb, skiplen); // Session Id Length
BSB_IMPORT_skip(bsb, skiplen); // Session Id
uint16_t cipher = 0;
BSB_IMPORT_u16(bsb, cipher);
char cipherHex[5];
snprintf(cipherHex, sizeof(cipherHex), "%04x", cipher);
BSB_IMPORT_skip(bsb, 1);
if (BSB_REMAINING(bsb) > 2) {
int etotlen = 0;
BSB_IMPORT_u16(bsb, etotlen); // Extensions Length
etotlen = MIN(etotlen, BSB_REMAINING(bsb));
BSB ebsb;
BSB_INIT(ebsb, BSB_WORK_PTR(bsb), etotlen);
while (BSB_REMAINING(ebsb) > 0) {
int etype = 0, elen = 0;
BSB_IMPORT_u16 (ebsb, etype);
BSB_IMPORT_u16 (ebsb, elen);
if (ja4plus_is_grease_value(etype)) {
BSB_IMPORT_skip (ebsb, elen);
continue;
}
ja4Extensions[ja4NumExtensions] = etype;
ja4NumExtensions++;
if (elen > BSB_REMAINING(ebsb))
break;
if (etype == 0x2b && elen == 2) { // etype 0x2b is supported version
BSB_IMPORT_u16(ebsb, supportedver);
supportedver = MAX(ver, supportedver);
continue; // Already processed ebsb above
}
if (etype == 0x10) { // ALPN
BSB alpnBsb;
BSB_IMPORT_bsb (ebsb, alpnBsb, elen);
BSB_IMPORT_skip (alpnBsb, 2); // len
uint8_t plen = 0;
BSB_IMPORT_u08 (alpnBsb, plen); // len
const unsigned char *pstr = NULL;
BSB_IMPORT_ptr (alpnBsb, pstr, plen);
if (plen > 0 && pstr && !BSB_IS_ERROR(alpnBsb)) {
ja4plus_alpn_to_ja4alpn(pstr, plen, ja4ALPN);
}
continue; // Already processed ebsb above
}
BSB_IMPORT_skip (ebsb, elen);
}
}
// JA4s Creation
char vstr[3];
ja4plus_ja4_version(supportedver, TRUE, vstr);
char ja4s[26];
ja4s[25] = 0;
ja4s[0] = 'd';
ja4s[1] = vstr[0];
ja4s[2] = vstr[1];
ja4plus_2digit_to_string(ja4NumExtensions, ja4s + 3);
ja4s[5] = ja4ALPN[0];
ja4s[6] = ja4ALPN[1];
ja4s[7] = '_';
memcpy(ja4s + 8, cipherHex, 4);
ja4s[12] = '_';
char tmpBuf[5 * 256];
BSB tmpBSB;
BSB_INIT(tmpBSB, tmpBuf, sizeof(tmpBuf));
for (int i = 0; i < ja4NumExtensions; i++) {
BSB_EXPORT_sprintf(tmpBSB, "%04x,", ja4Extensions[i]);
}
if (ja4NumExtensions > 0) {
BSB_EXPORT_rewind(tmpBSB, 1); // Remove last ,
}
GChecksum *const checksum = checksums256[session->thread];
if (BSB_LENGTH(tmpBSB) > 0) {
g_checksum_update(checksum, (guchar *)tmpBuf, BSB_LENGTH(tmpBSB));
memcpy(ja4s + 13, g_checksum_get_string(checksum), 12);
g_checksum_reset(checksum);
} else {
memcpy(ja4s + 13, "000000000000", 12);
}
arkime_field_string_add(ja4sField, session, ja4s, 25, TRUE);
if (ja4Raw) {
char ja4s_r[13 + 5 * 256];
memcpy(ja4s_r, ja4s, 13);
memcpy(ja4s_r + 13, tmpBuf, BSB_LENGTH(tmpBSB));
arkime_field_string_add(ja4sRawField, session, ja4s_r, 13 + BSB_LENGTH(tmpBSB), TRUE);
}
return 0;
}
/******************************************************************************/
LOCAL uint32_t ja4plus_tls_process_server_hello(ArkimeSession_t *session, const uint8_t *data, int len, void UNUSED(*uw))
{
// https://github.com/FoxIO-LLC/ja4/blob/main/technical_details/JA4S.md
uint8_t ja4NumExtensions = 0;
uint16_t ja4Extensions[256];
uint8_t ja4ALPN[2] = {'0', '0'};
BSB bsb;
BSB_INIT(bsb, data, len);
uint16_t ver = 0;
uint16_t supportedver;
BSB_IMPORT_u16(bsb, ver);
supportedver = ver;
BSB_IMPORT_skip(bsb, 32); // Random
if (BSB_IS_ERROR(bsb))
return -1;
/* Parse sessionid, only for SSLv3 - TLSv1.2 */
if (ver >= 0x0300 && ver <= 0x0303) {
int skiplen = 0;
BSB_IMPORT_u08(bsb, skiplen); // Session Id Length
BSB_IMPORT_skip(bsb, skiplen); // Session Id
}
uint16_t cipher = 0;
BSB_IMPORT_u16(bsb, cipher);
char cipherHex[5];
snprintf(cipherHex, sizeof(cipherHex), "%04x", cipher);
/* Thanks wireshark - No compression with TLS 1.3 before draft -22 */
if (ver < 0x0700 || ver >= 0x7f16) {
BSB_IMPORT_skip(bsb, 1);
}
if (BSB_REMAINING(bsb) > 2) {
int etotlen = 0;
BSB_IMPORT_u16(bsb, etotlen); // Extensions Length
etotlen = MIN(etotlen, BSB_REMAINING(bsb));
BSB ebsb;
BSB_INIT(ebsb, BSB_WORK_PTR(bsb), etotlen);
while (BSB_REMAINING(ebsb) > 0) {
int etype = 0, elen = 0;
BSB_IMPORT_u16 (ebsb, etype);
BSB_IMPORT_u16 (ebsb, elen);
if (ja4plus_is_grease_value(etype)) {
BSB_IMPORT_skip (ebsb, elen);
continue;
}
ja4Extensions[ja4NumExtensions] = etype;
ja4NumExtensions++;
if (elen > BSB_REMAINING(ebsb))
break;
if (etype == 0x2b && elen == 2) { // etype 0x2b is supported version
BSB_IMPORT_u16(ebsb, supportedver);
supportedver = MAX(ver, supportedver);
continue; // Already processed ebsb above
}
if (etype == 0x10) { // ALPN
BSB alpnBsb;
BSB_IMPORT_bsb (ebsb, alpnBsb, elen);
BSB_IMPORT_skip (alpnBsb, 2); // len
uint8_t plen = 0;
BSB_IMPORT_u08 (alpnBsb, plen); // len
const unsigned char *pstr = NULL;
BSB_IMPORT_ptr (alpnBsb, pstr, plen);
if (plen > 0 && pstr && !BSB_IS_ERROR(alpnBsb)) {
ja4plus_alpn_to_ja4alpn(pstr, plen, ja4ALPN);
}
continue; // Already processed ebsb above
}
BSB_IMPORT_skip (ebsb, elen);
}
}
// JA4s Creation
char vstr[3];
ja4plus_ja4_version(supportedver, FALSE, vstr);
char ja4s[26];
ja4s[25] = 0;
ja4s[0] = (session->ipProtocol == IPPROTO_TCP) ? 't' : 'q';
ja4s[1] = vstr[0];
ja4s[2] = vstr[1];
ja4plus_2digit_to_string(ja4NumExtensions, ja4s + 3);
ja4s[5] = ja4ALPN[0];
ja4s[6] = ja4ALPN[1];
ja4s[7] = '_';
memcpy(ja4s + 8, cipherHex, 4);
ja4s[12] = '_';
char tmpBuf[5 * 256];
BSB tmpBSB;
BSB_INIT(tmpBSB, tmpBuf, sizeof(tmpBuf));
for (int i = 0; i < ja4NumExtensions; i++) {
BSB_EXPORT_sprintf(tmpBSB, "%04x,", ja4Extensions[i]);
}
if (ja4NumExtensions > 0) {
BSB_EXPORT_rewind(tmpBSB, 1); // Remove last ,
}
GChecksum *const checksum = checksums256[session->thread];
if (BSB_LENGTH(tmpBSB) > 0) {
g_checksum_update(checksum, (guchar *)tmpBuf, BSB_LENGTH(tmpBSB));
memcpy(ja4s + 13, g_checksum_get_string(checksum), 12);
g_checksum_reset(checksum);
} else {
memcpy(ja4s + 13, "000000000000", 12);
}
arkime_field_string_add(ja4sField, session, ja4s, 25, TRUE);
if (ja4Raw) {
char ja4s_r[13 + 5 * 256];
memcpy(ja4s_r, ja4s, 13);
memcpy(ja4s_r + 13, tmpBuf, BSB_LENGTH(tmpBSB));
arkime_field_string_add(ja4sRawField, session, ja4s_r, 13 + BSB_LENGTH(tmpBSB), TRUE);
}
return 0;
}
/******************************************************************************/
LOCAL void ja4plus_cert_process_rdn(BSB *bsb, BSB *out)
{
uint32_t apc, atag, alen;
while (BSB_REMAINING(*bsb) > 3) {
uint8_t *value = arkime_parsers_asn_get_tlv(bsb, &apc, &atag, &alen);
if (!value)
return;
if (apc) {
BSB tbsb;
BSB_INIT(tbsb, value, alen);
ja4plus_cert_process_rdn(&tbsb, out);
} else if (atag == 6 && alen >= 3) {
for (uint32_t i = 0; i < alen; i++) {
BSB_EXPORT_ptr(*out, arkime_char_to_hexstr[value[i]], 2);
}
BSB_EXPORT_u08(*out, ',');
return;
}
}
}
/******************************************************************************/
LOCAL void ja4plus_cert_print(int thread, int pos, char *ja4x, BSB *out)
{
GChecksum *const checksum = checksums256[thread];
if (BSB_LENGTH(*out) > 0) {
BSB_EXPORT_rewind(*out, 1);
g_checksum_update(checksum, (guchar *)out->buf, BSB_LENGTH(*out));
memcpy(ja4x + (13 * pos), g_checksum_get_string(checksum), 12);
g_checksum_reset(checksum);
} else {
memcpy(ja4x + (13 * pos), "000000000000", 12);
}
}
/******************************************************************************/
LOCAL uint32_t ja4plus_process_certificate_wInfo(ArkimeSession_t *session, const uint8_t *data, int len, void *uw)
{
// https://github.com/FoxIO-LLC/ja4/blob/main/technical_details/JA4X.md
uint32_t atag, alen, apc;
uint8_t *value;
BSB bsb;
BSB_INIT(bsb, data, len);
/* Certificate */
if (!(value = arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen))) {
goto bad_cert;
}
BSB_INIT(bsb, value, alen);
/* signedCertificate */
if (!(value = arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen))) {
goto bad_cert;
}
BSB_INIT(bsb, value, alen);
/* serialNumber or version*/
if (!(value = arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen))) {
goto bad_cert;
}
if (apc) {
if (!(value = arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen))) {
goto bad_cert;
}
}
/* signature */
if (!arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen)) {
goto bad_cert;
}
/* issuer */
if (!(value = arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen))) {
goto bad_cert;
}
BSB out;
char outbuf[1000];
char ja4x[39];
char ja4x_r[1000];
ja4x[12] = ja4x[25] = '_';
ja4x[38] = 0;
BSB ja4x_rbsb;
BSB_INIT(ja4x_rbsb, ja4x_r, sizeof(ja4x_r));
BSB tbsb;
BSB_INIT(tbsb, value, alen);
BSB_INIT(out, outbuf, sizeof(outbuf));
ja4plus_cert_process_rdn(&tbsb, &out);
if (BSB_LENGTH(out) > 0)
BSB_EXPORT_ptr(ja4x_rbsb, out.buf, BSB_LENGTH(out) - 1);
BSB_EXPORT_u08(ja4x_rbsb, '_');
ja4plus_cert_print(session->thread, 0, ja4x, &out);
/* validity */
if (!(value = arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen))) {
goto bad_cert;
}
BSB_INIT(tbsb, value, alen);
if (!(value = arkime_parsers_asn_get_tlv(&tbsb, &apc, &atag, &alen))) {
goto bad_cert;
}
if (!(value = arkime_parsers_asn_get_tlv(&tbsb, &apc, &atag, &alen))) {
goto bad_cert;
}
/* subject */
if (!(value = arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen))) {
goto bad_cert;
}
BSB_INIT(tbsb, value, alen);
BSB_INIT(out, outbuf, sizeof(outbuf));
ja4plus_cert_process_rdn(&tbsb, &out);
if (BSB_LENGTH(out) > 0)
BSB_EXPORT_ptr(ja4x_rbsb, out.buf, BSB_LENGTH(out) - 1);
BSB_EXPORT_u08(ja4x_rbsb, '_');
ja4plus_cert_print(session->thread, 1, ja4x, &out);
/* subjectPublicKeyInfo */
if (!(value = arkime_parsers_asn_get_tlv(&bsb, &apc, &atag, &alen))) {
goto bad_cert;
}
/* extensions */
BSB_INIT(out, outbuf, sizeof(outbuf));
ja4plus_cert_process_rdn(&bsb, &out);
if (BSB_LENGTH(out) > 0)
BSB_EXPORT_ptr(ja4x_rbsb, out.buf, BSB_LENGTH(out) - 1);
BSB_EXPORT_u08(ja4x_rbsb, 0);
ja4plus_cert_print(session->thread, 2, ja4x, &out);
arkime_field_certsinfo_update_extra(uw, g_strdup("ja4x"), g_strdup(ja4x));
if (ja4Raw) {
arkime_field_certsinfo_update_extra(uw, g_strdup("ja4x_r"), g_strdup(ja4x_r));
}
return 0;
bad_cert:
return 0;
}
/******************************************************************************/
// Given a list of numbers find the mode, we ignore numbers > 2048
LOCAL int ja4plus_ssh_mode(const uint16_t *nums, int num)
{
unsigned char count[2048];
unsigned short mode = 0;
unsigned char modeCount = 0;
memset(count, 0, sizeof(count));
for (int i = 0; i < num; i++) {
if (nums[i] >= 2048)
continue;
count[nums[i]]++;
if (count[nums[i]] == modeCount && nums[i] < mode) {
// new count same as old max, but lower mode
mode = nums[i];
} else if (count[nums[i]] > modeCount) {
mode = nums[i];
modeCount = count[nums[i]];
}
}
return mode;
}
/******************************************************************************/
LOCAL uint32_t ja4plus_ssh_ja4ssh(ArkimeSession_t *session, const uint8_t *UNUSED(data), int UNUSED(len), void *uw)
{
// https://github.com/FoxIO-LLC/ja4/blob/main/technical_details/JA4SSH.md
char ja4ssh[50];
BSB bsb;
const SSHInfo_t *ssh = uw;
BSB_INIT(bsb, ja4ssh, sizeof(ja4ssh));
BSB_EXPORT_sprintf(bsb, "c%ds%d_c%ds%d_c%ds%d",
ja4plus_ssh_mode(ssh->lens[0], ssh->packets200[0]), ja4plus_ssh_mode(ssh->lens[1], ssh->packets200[1]),
ssh->packets200[0], ssh->packets200[1],
session->tcpFlagAckCnt[0], session->tcpFlagAckCnt[1]);
session->tcpFlagAckCnt[0] = session->tcpFlagAckCnt[1] = 0;
arkime_field_string_add(ja4sshField, session, ja4ssh, BSB_LENGTH(bsb), TRUE);
return 0;
}
/******************************************************************************/
LOCAL void ja4plus_ja4ts(ArkimeSession_t *session, const JA4PlusTCP_t *data, const struct tcphdr *tcph)
{
uint8_t *p = (uint8_t *)tcph + 20;
const uint8_t *end = (uint8_t *)tcph + tcph->th_off * 4;
uint16_t mss = 0xffff;
uint8_t window_scale = 0xff;
char obuf[100];
BSB obsb;
BSB_INIT(obsb, obuf, sizeof(obuf));
BSB_EXPORT_sprintf(obsb, "%d_", ntohs(tcph->th_win));
if (p == end) {
BSB_EXPORT_cstr(obsb, "00");
} else {
BSB hbsb;
BSB_INIT(hbsb, p, (int)(end - p));
while (BSB_REMAINING(hbsb) > 0 && !BSB_IS_ERROR(hbsb)) {
uint8_t next = 0;
BSB_IMPORT_u08(hbsb, next);
BSB_EXPORT_sprintf(obsb, "%d-", next);
if (next == 0) { // End of list
while (BSB_REMAINING(hbsb) > 0) { // Just keep adding all 0s after
BSB_IMPORT_u08(hbsb, next);
if (next == 0) {
BSB_EXPORT_sprintf(obsb, "%d-", next);
} else {
break;
}
}
break;
}
if (next == 1) // NOOP
continue;
uint8_t size = 0;
BSB_IMPORT_u08(hbsb, size);
if (size < 2 || BSB_REMAINING(hbsb) < size - 2)
break;
if (next == 2)
BSB_IMPORT_u16(hbsb, mss);
else if (next == 3)
BSB_IMPORT_u08(hbsb, window_scale);
else
BSB_IMPORT_skip(hbsb, size - 2);
}
BSB_EXPORT_rewind(obsb, 1); // remove last -
}
if (mss == 0xffff) {
BSB_EXPORT_cstr(obsb, "_00");
} else {
BSB_EXPORT_sprintf(obsb, "_%d", mss);
}
if (window_scale == 0xff) {
BSB_EXPORT_cstr(obsb, "_00");
} else {
BSB_EXPORT_sprintf(obsb, "_%d", window_scale);
}
if (data->synAckTimesCnt > 1) {
BSB_EXPORT_cstr(obsb, "_");
for (int i = 1; i < data->synAckTimesCnt; i++) {
BSB_EXPORT_sprintf(obsb, "%.0f-", round ((data->synAckTimes[i] - data->synAckTimes[i - 1]) / 1000000));
}
BSB_EXPORT_rewind(obsb, 1); // remove last -
}
BSB_EXPORT_u08(obsb, 0);
arkime_field_string_add(ja4tsField, session, obuf, -1, TRUE);
}
/******************************************************************************/
LOCAL void ja4plus_ja4t(ArkimeSession_t *session, JA4PlusTCP_t UNUSED(*data), const struct tcphdr *tcph)
{
uint8_t *p = (uint8_t *)tcph + 20;
const uint8_t *end = (uint8_t *)tcph + tcph->th_off * 4;
uint16_t mss = 0xffff;
uint8_t window_scale = 0xff;
char obuf[100];
BSB obsb;
BSB_INIT(obsb, obuf, sizeof(obuf));
BSB_EXPORT_sprintf(obsb, "%d_", ntohs(tcph->th_win));
if (p == end) {
BSB_EXPORT_cstr(obsb, "00");
} else {
BSB hbsb;
BSB_INIT(hbsb, p, (int)(end - p));
while (BSB_REMAINING(hbsb) > 0 && !BSB_IS_ERROR(hbsb)) {
uint8_t next = 0;
BSB_IMPORT_u08(hbsb, next);
BSB_EXPORT_sprintf(obsb, "%d-", next);
if (next == 0) { // End of list
while (BSB_REMAINING(hbsb) > 0) { // Just keep adding all 0s after
BSB_IMPORT_u08(hbsb, next);
if (next == 0) {
BSB_EXPORT_sprintf(obsb, "%d-", next);
} else {
break;
}
}
break;
}
if (next == 1) // NOOP
continue;
uint8_t size = 0;
BSB_IMPORT_u08(hbsb, size);
if (size < 2 || BSB_REMAINING(hbsb) < size - 2)
break;