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|
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <openssl/md5.h>
#include <MESA/stream.h>
#include "ssl.h"
int g_ssl_ja3_fingerprint_label_id=-1;
#ifndef MIN
#define MIN(a, b) ((a) > (b) ? (b) : (a))
#endif
#define BSB_INIT(b, buffer, size) \
do \
{ \
(b).buf = (unsigned char *)buffer; \
(b).ptr = (unsigned char *)buffer; \
int s = (int)size; \
if ((buffer == NULL) || (s < 0)) \
(b).end = 0; \
else \
(b).end = (unsigned char *)buffer + size; \
} while (0)
#define BSB_SET_ERROR(b) ((b).end = NULL)
#define BSB_IS_ERROR(b) ((b).end == NULL)
#define BSB_NOT_ERROR(b) ((b).end != NULL)
#define BSB_LENGTH(b) ((b).ptr - (b).buf)
#define BSB_POSITION BSB_LENGTH
#define BSB_SIZE(b) ((b).end - (b).buf)
#define BSB_REMAINING(b) ((b).end ? (b).end - (b).ptr : 0)
#define BSB_WORK_PTR(b) ((b).ptr)
#define BSB_EXPORT_u08(b, x) \
do \
{ \
if ((b).ptr && (b).ptr + 1 <= (b).end) \
{ \
*(((b).ptr)++) = (unsigned char)x; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_EXPORT_u16(b, x) \
do \
{ \
if ((b).ptr && (b).ptr + 2 <= (b).end) \
{ \
uint16_t t = (uint16_t)x; \
*(((b).ptr)++) = (t & 0xff00) >> 8; \
*(((b).ptr)++) = (t & 0x00ff); \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_EXPORT_u32(b, x) \
do \
{ \
if ((b).ptr && (b).ptr + 4 <= (b).end) \
{ \
uint32_t t = x; \
*(((b).ptr)++) = (t & 0xff000000) >> 24; \
*(((b).ptr)++) = (t & 0x00ff0000) >> 16; \
*(((b).ptr)++) = (t & 0x0000ff00) >> 8; \
*(((b).ptr)++) = (t & 0x000000ff); \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_EXPORT_ptr(b, x, size) \
do \
{ \
if ((x || size == 0) && \
(b).ptr + size <= (b).end && \
(b).ptr + size >= (b).buf) \
{ \
memcpy((b).ptr, x, size); \
(b).ptr += size; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_EXPORT_ptr_some(b, x, size) \
do \
{ \
if ((b).ptr + size <= (b).end) \
{ \
memcpy((b).ptr, x, size); \
(b).ptr += size; \
} \
else if (BSB_NOT_ERROR(b)) \
{ \
memcpy((b).ptr, x, BSB_REMAINING(b)); \
(b).ptr += BSB_REMAINING(b); \
} \
} while (0)
#define BSB_EXPORT_cstr(b, x) \
do \
{ \
const int size = sizeof x - 1; \
if ((b).ptr + size <= (b).end) \
{ \
memcpy((b).ptr, x, size); \
(b).ptr += size; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_EXPORT_skip(b, size) \
do \
{ \
if ((b).ptr + size <= (b).end && \
(b).ptr + size >= (b).buf) \
{ \
(b).ptr += size; \
if ((b).ptr < (b).buf) \
(b).end = 0; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_EXPORT_rewind(b, size) \
do \
{ \
if ((b).ptr - size <= (b).end && \
(b).ptr - size >= (b).buf) \
{ \
(b).ptr -= size; \
if ((b).ptr < (b).buf) \
(b).end = 0; \
} \
else \
{ \
BSB_SET_ERROR(b); \
} \
} while (0)
#if defined(C9X)
#define BSB_EXPORT_sprintf(b, ...) \
do \
{ \
if ((b).end != 0) \
{ \
int l = snprintf((char *)(b).ptr, \
(b).end - (b).ptr, \
__VA_ARGS__); \
if (l <= (b).end - (b).ptr) \
{ \
(b).ptr += l; \
} \
else \
{ \
BSB_SET_ERROR(b); \
} \
} \
} while (0)
#else
#define BSB_EXPORT_sprintf(b, args...) \
do \
{ \
if ((b).end != 0) \
{ \
int l = snprintf((char *)(b).ptr, \
(b).end - (b).ptr, \
##args); \
if (l <= (b).end - (b).ptr) \
{ \
(b).ptr += l; \
} \
else \
{ \
BSB_SET_ERROR(b); \
} \
} \
} while (0)
#endif
#define BSB_IMPORT_u08(b, x) \
do \
{ \
if ((b).ptr && (b).ptr + 1 <= (b).end) \
{ \
x = *(((b).ptr)++); \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_IMPORT_u16(b, x) \
do \
{ \
if ((b).ptr && (b).ptr + 2 <= (b).end) \
{ \
x = ((uint16_t)((b).ptr)[0]) << 8 | \
((uint16_t)((b).ptr)[1]); \
(b).ptr += 2; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_IMPORT_u24(b, x) \
do \
{ \
if ((b).ptr && (b).ptr + 3 <= (b).end) \
{ \
x = ((uint32_t)((b).ptr)[0]) << 16 | \
((uint32_t)((b).ptr)[1]) << 8 | \
((uint32_t)((b).ptr)[2]); \
(b).ptr += 3; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_IMPORT_u32(b, x) \
do \
{ \
if ((b).ptr && (b).ptr + 4 <= (b).end) \
{ \
x = ((uint32_t)((b).ptr)[0]) << 24 | \
((uint32_t)((b).ptr)[1]) << 16 | \
((uint32_t)((b).ptr)[2]) << 8 | \
((uint32_t)((b).ptr)[3]); \
(b).ptr += 4; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_LEXPORT_u08(b, x) BSB_EXPORT_u08(b, x)
#define BSB_LEXPORT_u16(b, x) \
do \
{ \
if ((b).ptr + 2 <= (b).end) \
{ \
uint16_t t = (uint16_t)x; \
*(((b).ptr)++) = (t & 0x00ff); \
*(((b).ptr)++) = (t & 0xff00) >> 8; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_LEXPORT_u32(b, x) \
do \
{ \
if ((b).ptr + 4 <= (b).end) \
{ \
uint32_t t = x; \
*(((b).ptr)++) = (t & 0x000000ff); \
*(((b).ptr)++) = (t & 0x0000ff00) >> 8; \
*(((b).ptr)++) = (t & 0x00ff0000) >> 16; \
*(((b).ptr)++) = (t & 0xff000000) >> 24; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_LIMPORT_u08(b, x) BSB_IMPORT_u08(b, x)
#define BSB_LIMPORT_u16(b, x) \
do \
{ \
if ((b).ptr + 2 <= (b).end) \
{ \
x = ((uint16_t)((b).ptr)[1]) << 8 | \
((uint16_t)((b).ptr)[0]); \
(b).ptr += 2; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_LIMPORT_u24(b, x) \
do \
{ \
if ((b).ptr + 3 <= (b).end) \
{ \
x = ((uint32_t)((b).ptr)[2]) << 16 | \
((uint32_t)((b).ptr)[1]) << 8 | \
((uint32_t)((b).ptr)[0]); \
(b).ptr += 3; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_LIMPORT_u32(b, x) \
do \
{ \
if ((b).ptr + 4 <= (b).end) \
{ \
x = ((uint32_t)((b).ptr)[3]) << 24 | \
((uint32_t)((b).ptr)[2]) << 16 | \
((uint32_t)((b).ptr)[1]) << 8 | \
((uint32_t)((b).ptr)[0]); \
(b).ptr += 4; \
} \
else \
BSB_SET_ERROR(b); \
} while (0)
#define BSB_IMPORT_ptr(b, x, size) \
do \
{ \
if ((b).ptr + size <= (b).end && \
(b).ptr + size >= (b).buf) \
{ \
(x) = (b).ptr; \
(b).ptr += size; \
} \
else \
{ \
BSB_SET_ERROR(b); \
x = 0; \
} \
} while (0)
#define BSB_LIMPORT_ptr BSB_IMPORT_ptr
#define BSB_IMPORT_skip BSB_EXPORT_skip
#define BSB_LIMPORT_skip BSB_EXPORT_skip
#define BSB_IMPORT_rewind BSB_EXPORT_rewind
#define BSB_LIMPORT_rewind BSB_EXPORT_rewind
#define BSB_memchr(b, ch, pos) \
do \
{ \
if (BSB_IS_ERROR(b)) \
{ \
pos = 0; \
break; \
} \
char *s = memchr((char *)b.ptr, ch, BSB_REMAINING(b)); \
if (s) \
pos = (char *)s - (char *)b.ptr; \
else \
pos = 0; \
} while (0)
#define BSB_memcmp(str, b, len) ((b).ptr + len <= (b).end ? memcmp(str, b.ptr, len) : -1)
#define BSB_PEEK(b) ((b).ptr + 1 <= (b).end ? *b.ptr : -1)
#define BSB_IMPORT_zbyte(b, x, size) \
do \
{ \
if ((b).ptr + size <= (b).end) \
{ \
memcpy(x, b, size); \
(x)[size] = 0; \
(b).ptr += size; \
} \
else \
{ \
BSB_SET_ERROR(b); \
(x)[0] = 0; \
} \
} while (0)
/* Private data structure */
typedef struct bsb
{
unsigned char *buf;
unsigned char *ptr;
unsigned char *end;
} BSB;
static int ja3_md5sum(const char *str, int len, char *buf, int size)
{
int n;
int ret = 0;
MD5_CTX ctx;
unsigned char tmp[MD5_DIGEST_LENGTH];
MD5_Init(&ctx);
MD5_Update(&ctx, str, len);
MD5_Final(tmp, &ctx);
for (n = 0; n < MD5_DIGEST_LENGTH; n++)
{
ret += snprintf(buf + ret, size - ret, "%.2x", tmp[n]);
}
return ret;
}
// https://tools.ietf.org/html/draft-davidben-tls-grease-00
static int tls_is_grease_value(uint32_t val)
{
if ((val & 0x0f) != 0x0a)
return 0;
if ((val & 0xff) != ((val >> 8) & 0xff))
return 0;
return 1;
}
static int ssl_generate_ja3_fingerprint(const unsigned char *data, int len, char *ja3_fp, int ja3_fp_len, char *sni_buff, int sni_buff_len)
{
BSB sslbsb;
//char ja3[30000];
BSB ja3bsb;
char ecfja3[1000];
BSB ecfja3bsb;
char eja3[10000];
BSB eja3bsb;
char ecja3[10000];
BSB ecja3bsb;
BSB_INIT(sslbsb, data, len);
BSB_INIT(ja3bsb, ja3_fp, sizeof(ja3_fp));
BSB_INIT(ecja3bsb, ecja3, sizeof(ecja3));
BSB_INIT(ecfja3bsb, ecfja3, sizeof(ecfja3));
BSB_INIT(eja3bsb, eja3, sizeof(eja3));
if (BSB_REMAINING(sslbsb) > 5)
{
unsigned char *ssldata = BSB_WORK_PTR(sslbsb);
int ssllen = MIN(BSB_REMAINING(sslbsb) - 5, ssldata[3] << 8 | ssldata[4]);
BSB pbsb;
BSB_INIT(pbsb, ssldata + 5, ssllen);
if (BSB_REMAINING(pbsb) > 7)
{
unsigned char *pdata = BSB_WORK_PTR(pbsb);
int plen = MIN(BSB_REMAINING(pbsb) - 4, pdata[2] << 8 | pdata[3]);
uint16_t ver = 0;
BSB_IMPORT_skip(pbsb, 4); // type + len
BSB_IMPORT_u16(pbsb, ver);
BSB_EXPORT_sprintf(ja3bsb, "%d,", ver);
BSB cbsb;
BSB_INIT(cbsb, pdata + 6, plen - 2); // The - 4 for plen is done above, confusing
if (BSB_REMAINING(cbsb) > 32)
{
BSB_IMPORT_skip(cbsb, 32); // Random
int skiplen = 0;
BSB_IMPORT_u08(cbsb, skiplen); // Session Id Length
if (skiplen > 0 && BSB_REMAINING(cbsb) > skiplen)
{
// unsigned char *ptr = BSB_WORK_PTR(cbsb);
// char sessionId[513];
// int i;
// for (i = 0; i < skiplen; i++)
// {
// sessionId[i * 2] = moloch_char_to_hexstr[ptr[i]][0];
// sessionId[i * 2 + 1] = moloch_char_to_hexstr[ptr[i]][1];
// }
// sessionId[skiplen * 2] = 0;
// moloch_field_string_add(srcIdField, session, sessionId, skiplen * 2, TRUE);
}
BSB_IMPORT_skip(cbsb, skiplen); // Session Id
BSB_IMPORT_u16(cbsb, skiplen); // Ciper Suites Length
while (BSB_NOT_ERROR(cbsb) && skiplen > 0)
{
uint16_t c = 0;
BSB_IMPORT_u16(cbsb, c);
if (!tls_is_grease_value(c))
{
BSB_EXPORT_sprintf(ja3bsb, "%d-", c);
}
skiplen -= 2;
}
BSB_EXPORT_rewind(ja3bsb, 1); // Remove last -
BSB_EXPORT_u08(ja3bsb, ',');
BSB_IMPORT_u08(cbsb, skiplen); // Compression Length
BSB_IMPORT_skip(cbsb, skiplen); // Compressions
if (BSB_REMAINING(cbsb) > 6)
{
int etotlen = 0;
BSB_IMPORT_u16(cbsb, etotlen); // Extensions Length
etotlen = MIN(etotlen, BSB_REMAINING(cbsb));
BSB ebsb;
BSB_INIT(ebsb, BSB_WORK_PTR(cbsb), etotlen);
while (BSB_REMAINING(ebsb) > 4)
{
uint16_t etype = 0, elen = 0;
BSB_IMPORT_u16(ebsb, etype);
BSB_IMPORT_u16(ebsb, elen);
if (!tls_is_grease_value(etype))
BSB_EXPORT_sprintf(eja3bsb, "%d-", etype);
if (elen > BSB_REMAINING(ebsb))
break;
if (etype == 0)
{ // SNI
BSB snibsb;
BSB_INIT(snibsb, BSB_WORK_PTR(ebsb), elen);
BSB_IMPORT_skip(ebsb, elen);
int sni = 0;
BSB_IMPORT_u16(snibsb, sni); // list len
if (sni != BSB_REMAINING(snibsb))
continue;
BSB_IMPORT_u08(snibsb, sni); // type
if (sni != 0)
continue;
BSB_IMPORT_u16(snibsb, sni); // len
if (sni != BSB_REMAINING(snibsb))
continue;
memcpy(sni_buff, (char *)BSB_WORK_PTR(snibsb), (sni>sni_buff_len ? sni_buff_len : sni));
// moloch_field_string_add(hostField, session, (char *)BSB_WORK_PTR(snibsb), sni, TRUE);
}
else if (etype == 0x000a)
{ // Elliptic Curves
BSB bsb;
BSB_INIT(bsb, BSB_WORK_PTR(ebsb), elen);
BSB_IMPORT_skip(ebsb, elen);
uint16_t llen = 0;
BSB_IMPORT_u16(bsb, llen); // list len
while (llen > 0 && !BSB_IS_ERROR(bsb))
{
uint16_t c = 0;
BSB_IMPORT_u16(bsb, c);
if (!tls_is_grease_value(c))
{
BSB_EXPORT_sprintf(ecja3bsb, "%d-", c);
}
llen -= 2;
}
BSB_EXPORT_rewind(ecja3bsb, 1); // Remove last -
}
else if (etype == 0x000b)
{ // Elliptic Curves point formats
BSB bsb;
BSB_INIT(bsb, BSB_WORK_PTR(ebsb), elen);
BSB_IMPORT_skip(ebsb, elen);
uint16_t llen = 0;
BSB_IMPORT_u08(bsb, llen); // list len
while (llen > 0 && !BSB_IS_ERROR(bsb))
{
uint8_t c = 0;
BSB_IMPORT_u08(bsb, c);
BSB_EXPORT_sprintf(ecfja3bsb, "%d-", c);
llen -= 1;
}
BSB_EXPORT_rewind(ecfja3bsb, 1); // Remove last -
}
else
{
BSB_IMPORT_skip(ebsb, elen);
}
}
BSB_EXPORT_rewind(eja3bsb, 1); // Remove last -
}
}
}
BSB_IMPORT_skip(sslbsb, ssllen + 5);
#if 0
if (BSB_LENGTH(ja3bsb) > 0 && BSB_NOT_ERROR(ja3bsb) && BSB_NOT_ERROR(ecja3bsb) && BSB_NOT_ERROR(eja3bsb) && BSB_NOT_ERROR(ecfja3bsb))
{
BSB_EXPORT_sprintf(ja3bsb, "%.*s,%.*s,%.*s", (int)BSB_LENGTH(eja3bsb), eja3, (int)BSB_LENGTH(ecja3bsb), ecja3, (int)BSB_LENGTH(ecfja3bsb), ecfja3);
printf("JA3: %s\n", ja3_fp);
}
#endif
return 1;
}
return 0;
}
static void free_ja3_fingerprint_label(int thread_seq, void *value)
{
struct _ssl_ja3_info_t *ja3_info=(struct _ssl_ja3_info_t *)value;
if(value!=NULL)
{
dictator_free(thread_seq, (void *)ja3_info->sni);
ja3_info->sni=NULL;
dictator_free(thread_seq, (void *)ja3_info->fp);
ja3_info->sni=NULL;
dictator_free(thread_seq, value);
value=NULL;
}
return ;
}
struct _ssl_ja3_info_t *ssl_get_ja3_fingerprint(struct streaminfo *stream, unsigned char *payload, int payload_len, int thread_seq)
{
int ret=0;
char ja3_fp[30000]={0};
char sni_buff[1024]={0};
struct _ssl_ja3_info_t *ja3_info=(struct _ssl_ja3_info_t *)project_req_get_struct(stream, g_ssl_ja3_fingerprint_label_id);
if(ja3_info!=NULL)
{
return ja3_info;
}
ret=ssl_generate_ja3_fingerprint(payload, payload_len, ja3_fp, sizeof(ja3_fp), sni_buff, sizeof(sni_buff));
if(ret==1)
{
ja3_info=(struct _ssl_ja3_info_t *)dictator_malloc(thread_seq, sizeof(struct _ssl_ja3_info_t));
if(strlen(sni_buff)>0 && strlen(sni_buff)<sizeof(sni_buff))
{
ja3_info->sni_len=strlen(sni_buff);
ja3_info->sni=(char *)dictator_malloc(thread_seq, ja3_info->sni_len+1);
memcpy(ja3_info->sni, sni_buff, ja3_info->sni_len);
ja3_info->sni[ja3_info->sni_len]='\0';
}
if(strlen(ja3_fp)>0 && strlen(ja3_fp)<sizeof(ja3_fp))
{
ja3_info->fp=(char *)dictator_malloc(thread_seq, MD5_DIGEST_LENGTH*2+1);
ja3_info->fp_len=ja3_md5sum(ja3_fp, strlen(ja3_fp), ja3_info->fp, MD5_DIGEST_LENGTH*2+1);
ja3_info->fp[ja3_info->fp_len]='\0';
}
project_req_add_struct(stream, g_ssl_ja3_fingerprint_label_id, (void *)ja3_info);
return ja3_info;
}
return NULL;
}
int ssl_ja3_init(void)
{
g_ssl_ja3_fingerprint_label_id=project_producer_register("JA3_FINGERPRINT_LABEL", "struct", free_ja3_fingerprint_label);
return 0;
}
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