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nDPI/src/lib/ndpi_utils.c
Luca Deri e5e69d0f7a Added the ability to detect when a known protocol is using a non-standard port 
Added check to spot executables exchanged via HTTP
2020-05-10 21:25:38 +02:00

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/*
* ndpi_utils.c
*
* Copyright (C) 2011-20 - ntop.org
*
* 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 <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_UNKNOWN
#include "ndpi_config.h"
#include "ndpi_api.h"
#include "ahocorasick.h"
#include "libcache.h"
#include <time.h>
#ifndef WIN32
#include <unistd.h>
#endif
#if defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__
#include <sys/endian.h>
#endif
#include "third_party/include/ndpi_patricia.h"
#include "third_party/include/ht_hash.h"
#include "third_party/include/libinjection.h"
#include "third_party/include/libinjection_sqli.h"
#include "third_party/include/libinjection_xss.h"
#include "third_party/include/rce_injection.h"
#define NDPI_CONST_GENERIC_PROTOCOL_NAME "GenericProtocol"
// #define MATCH_DEBUG 1
/* implementation of the punycode check function */
int ndpi_check_punycode_string(char * buffer , int len) {
int i = 0;
while(i++ < len) {
if((buffer[i] == 'x')
&& (buffer[i+1] == 'n')
&& (buffer[i+2] == '-')
&& (buffer[i+3] == '-'))
// is a punycode string
return(1);
}
// not a punycode string
return 0;
}
/* ftp://ftp.cc.uoc.gr/mirrors/OpenBSD/src/lib/libc/stdlib/tsearch.c */
/* find or insert datum into search tree */
void * ndpi_tsearch(const void *vkey, void **vrootp,
int (*compar)(const void *, const void *))
{
ndpi_node *q;
char *key = (char *)vkey;
ndpi_node **rootp = (ndpi_node **)vrootp;
if(rootp == (ndpi_node **)0)
return ((void *)0);
while (*rootp != (ndpi_node *)0) { /* Knuth's T1: */
int r;
if((r = (*compar)(key, (*rootp)->key)) == 0) /* T2: */
return ((*rootp)->key); /* we found it! */
rootp = (r < 0) ?
&(*rootp)->left : /* T3: follow left branch */
&(*rootp)->right; /* T4: follow right branch */
}
q = (ndpi_node *) ndpi_malloc(sizeof(ndpi_node)); /* T5: key not found */
if(q != (ndpi_node *)0) { /* make new node */
*rootp = q; /* link new node to old */
q->key = key; /* initialize new node */
q->left = q->right = (ndpi_node *)0;
}
return ((void *)q->key);
}
/* delete node with given key */
void * ndpi_tdelete(const void *vkey, void **vrootp,
int (*compar)(const void *, const void *))
{
ndpi_node **rootp = (ndpi_node **)vrootp;
char *key = (char *)vkey;
ndpi_node *q;
ndpi_node *r;
int cmp;
if(rootp == (ndpi_node **)0 || *rootp == (ndpi_node *)0)
return((void *)0);
while ((cmp = (*compar)(key, (*rootp)->key)) != 0) {
rootp = (cmp < 0) ?
&(*rootp)->left : /* follow left branch */
&(*rootp)->right; /* follow right branch */
if(*rootp == (ndpi_node *)0)
return ((void *)0); /* key not found */
}
r = (*rootp)->right; /* D1: */
if((q = (*rootp)->left) == (ndpi_node *)0) /* Left (ndpi_node *)0? */
q = r;
else if(r != (ndpi_node *)0) { /* Right link is null? */
if(r->left == (ndpi_node *)0) { /* D2: Find successor */
r->left = q;
q = r;
} else { /* D3: Find (ndpi_node *)0 link */
for(q = r->left; q->left != (ndpi_node *)0; q = r->left)
r = q;
r->left = q->right;
q->left = (*rootp)->left;
q->right = (*rootp)->right;
}
}
key = (*rootp)->key;
ndpi_free((ndpi_node *) *rootp); /* D4: Free node */
*rootp = q; /* link parent to new node */
/* Return the key to give the caller a chance to free custom data */
return(key);
}
/* Walk the nodes of a tree */
static void ndpi_trecurse(ndpi_node *root, void (*action)(const void *, ndpi_VISIT, int, void*), int level, void *user_data)
{
if(root->left == (ndpi_node *)0 && root->right == (ndpi_node *)0)
(*action)(root, ndpi_leaf, level, user_data);
else {
(*action)(root, ndpi_preorder, level, user_data);
if(root->left != (ndpi_node *)0)
ndpi_trecurse(root->left, action, level + 1, user_data);
(*action)(root, ndpi_postorder, level, user_data);
if(root->right != (ndpi_node *)0)
ndpi_trecurse(root->right, action, level + 1, user_data);
(*action)(root, ndpi_endorder, level, user_data);
}
}
/* Walk the nodes of a tree */
void ndpi_twalk(const void *vroot, void (*action)(const void *, ndpi_VISIT, int, void *), void *user_data)
{
ndpi_node *root = (ndpi_node *)vroot;
if(root != (ndpi_node *)0 && action != (void (*)(const void *, ndpi_VISIT, int, void*))0)
ndpi_trecurse(root, action, 0, user_data);
}
/* find a node, or return 0 */
void * ndpi_tfind(const void *vkey, void *vrootp,
int (*compar)(const void *, const void *))
{
char *key = (char *)vkey;
ndpi_node **rootp = (ndpi_node **)vrootp;
if(rootp == (ndpi_node **)0)
return ((ndpi_node *)0);
while (*rootp != (ndpi_node *)0) { /* T1: */
int r;
if((r = (*compar)(key, (*rootp)->key)) == 0) /* T2: */
return (*rootp); /* key found */
rootp = (r < 0) ?
&(*rootp)->left : /* T3: follow left branch */
&(*rootp)->right; /* T4: follow right branch */
}
return (ndpi_node *)0;
}
/* ****************************************** */
/* Walk the nodes of a tree */
static void ndpi_tdestroy_recurse(ndpi_node* root, void (*free_action)(void *))
{
if(root->left != NULL)
ndpi_tdestroy_recurse(root->left, free_action);
if(root->right != NULL)
ndpi_tdestroy_recurse(root->right, free_action);
(*free_action) ((void *) root->key);
ndpi_free(root);
}
void ndpi_tdestroy(void *vrootp, void (*freefct)(void *))
{
ndpi_node *root = (ndpi_node *) vrootp;
if(root != NULL)
ndpi_tdestroy_recurse(root, freefct);
}
/* ****************************************** */
u_int8_t ndpi_net_match(u_int32_t ip_to_check,
u_int32_t net,
u_int32_t num_bits) {
u_int32_t mask = 0;
num_bits &= 0x1F; /* Avoid overflows */
mask = ~(~mask >> num_bits);
return(((ip_to_check & mask) == (net & mask)) ? 1 : 0);
}
u_int8_t ndpi_ips_match(u_int32_t src, u_int32_t dst,
u_int32_t net, u_int32_t num_bits)
{
return(ndpi_net_match(src, net, num_bits) || ndpi_net_match(dst, net, num_bits));
}
/* ****************************************** */
#ifdef WIN32
/* http://opensource.apple.com/source/Libc/Libc-186/string.subproj/strcasecmp.c */
/*
* This array is designed for mapping upper and lower case letter
* together for a case independent comparison. The mappings are
* based upon ascii character sequences.
*/
static const u_char charmap[] = {
'\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
'\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
'\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
'\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
'\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
'\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
'\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
'\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
'\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
'\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
'\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
'\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
'\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
'\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
'\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
'\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
'\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
'\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
'\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
'\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
'\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
'\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
'\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
'\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
'\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
'\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
'\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
'\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
};
int strcasecmp(const char *s1, const char *s2) {
register const u_char *cm = charmap,
*us1 = (const u_char *)s1,
*us2 = (const u_char *)s2;
while (cm[*us1] == cm[*us2++])
if(*us1++ == '\0')
return (0);
return (cm[*us1] - cm[*--us2]);
}
/* ****************************************** */
int strncasecmp(const char *s1, const char *s2, size_t n) {
if(n != 0) {
register const u_char *cm = charmap,
*us1 = (const u_char *)s1,
*us2 = (const u_char *)s2;
do {
if(cm[*us1] != cm[*us2++])
return (cm[*us1] - cm[*--us2]);
if(*us1++ == '\0')
break;
} while (--n != 0);
}
return (0);
}
#endif
/* **************************************** */
u_int8_t ndpi_is_safe_ssl_cipher(u_int32_t cipher) {
/* https://community.qualys.com/thread/18212-how-does-qualys-determine-the-server-cipher-suites */
/* INSECURE */
switch(cipher) {
case 0xc011: return(NDPI_CIPHER_INSECURE); /* TLS_ECDHE_RSA_WITH_RC4_128_SHA */
case 0x0005: return(NDPI_CIPHER_INSECURE); /* TLS_RSA_WITH_RC4_128_SHA */
case 0x0004: return(NDPI_CIPHER_INSECURE); /* TLS_RSA_WITH_RC4_128_MD5 */
/* WEAK */
case 0x009d: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_AES_256_GCM_SHA384 */
case 0x003d: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_AES_256_CBC_SHA256 */
case 0x0035: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_AES_256_CBC_SHA */
case 0x0084: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_CAMELLIA_256_CBC_SHA */
case 0x009c: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_AES_128_GCM_SHA256 */
case 0x003c: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_AES_128_CBC_SHA256 */
case 0x002f: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_AES_128_CBC_SHA */
case 0x0041: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_CAMELLIA_128_CBC_SHA */
case 0xc012: return(NDPI_CIPHER_WEAK); /* TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA */
case 0x0016: return(NDPI_CIPHER_WEAK); /* TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA */
case 0x000a: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_3DES_EDE_CBC_SHA */
case 0x0096: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_SEED_CBC_SHA */
case 0x0007: return(NDPI_CIPHER_WEAK); /* TLS_RSA_WITH_IDEA_CBC_SHA */
default: return(NDPI_CIPHER_SAFE);
}
}
/* ***************************************************** */
const char* ndpi_cipher2str(u_int32_t cipher) {
switch(cipher) {
case 0x000000: return("TLS_NULL_WITH_NULL_NULL");
case 0x000001: return("TLS_RSA_WITH_NULL_MD5");
case 0x000002: return("TLS_RSA_WITH_NULL_SHA");
case 0x000003: return("TLS_RSA_EXPORT_WITH_RC4_40_MD5");
case 0x000004: return("TLS_RSA_WITH_RC4_128_MD5");
case 0x000005: return("TLS_RSA_WITH_RC4_128_SHA");
case 0x000006: return("TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5");
case 0x000007: return("TLS_RSA_WITH_IDEA_CBC_SHA");
case 0x000008: return("TLS_RSA_EXPORT_WITH_DES40_CBC_SHA");
case 0x000009: return("TLS_RSA_WITH_DES_CBC_SHA");
case 0x00000a: return("TLS_RSA_WITH_3DES_EDE_CBC_SHA");
case 0x00000b: return("TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA");
case 0x00000c: return("TLS_DH_DSS_WITH_DES_CBC_SHA");
case 0x00000d: return("TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA");
case 0x00000e: return("TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA");
case 0x00000f: return("TLS_DH_RSA_WITH_DES_CBC_SHA");
case 0x000010: return("TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA");
case 0x000011: return("TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA");
case 0x000012: return("TLS_DHE_DSS_WITH_DES_CBC_SHA");
case 0x000013: return("TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA");
case 0x000014: return("TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA");
case 0x000015: return("TLS_DHE_RSA_WITH_DES_CBC_SHA");
case 0x000016: return("TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA");
case 0x000017: return("TLS_DH_anon_EXPORT_WITH_RC4_40_MD5");
case 0x000018: return("TLS_DH_anon_WITH_RC4_128_MD5");
case 0x000019: return("TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA");
case 0x00001a: return("TLS_DH_anon_WITH_DES_CBC_SHA");
case 0x00001b: return("TLS_DH_anon_WITH_3DES_EDE_CBC_SHA");
case 0x00001c: return("TLS_FORTEZZA_KEA_WITH_NULL_SHA");
case 0x00001d: return("TLS_FORTEZZA_KEA_WITH_FORTEZZA_CBC_SHA");
/* case 0x00001e: return("TLS_FORTEZZA_KEA_WITH_RC4_128_SHA"); */
case 0x00001E: return("TLS_KRB5_WITH_DES_CBC_SHA");
case 0x00001F: return("TLS_KRB5_WITH_3DES_EDE_CBC_SHA");
case 0x000020: return("TLS_KRB5_WITH_RC4_128_SHA");
case 0x000021: return("TLS_KRB5_WITH_IDEA_CBC_SHA");
case 0x000022: return("TLS_KRB5_WITH_DES_CBC_MD5");
case 0x000023: return("TLS_KRB5_WITH_3DES_EDE_CBC_MD5");
case 0x000024: return("TLS_KRB5_WITH_RC4_128_MD5");
case 0x000025: return("TLS_KRB5_WITH_IDEA_CBC_MD5");
case 0x000026: return("TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA");
case 0x000027: return("TLS_KRB5_EXPORT_WITH_RC2_CBC_40_SHA");
case 0x000028: return("TLS_KRB5_EXPORT_WITH_RC4_40_SHA");
case 0x000029: return("TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5");
case 0x00002A: return("TLS_KRB5_EXPORT_WITH_RC2_CBC_40_MD5");
case 0x00002B: return("TLS_KRB5_EXPORT_WITH_RC4_40_MD5");
case 0x00002C: return("TLS_PSK_WITH_NULL_SHA");
case 0x00002D: return("TLS_DHE_PSK_WITH_NULL_SHA");
case 0x00002E: return("TLS_RSA_PSK_WITH_NULL_SHA");
case 0x00002f: return("TLS_RSA_WITH_AES_128_CBC_SHA");
case 0x000030: return("TLS_DH_DSS_WITH_AES_128_CBC_SHA");
case 0x000031: return("TLS_DH_RSA_WITH_AES_128_CBC_SHA");
case 0x000032: return("TLS_DHE_DSS_WITH_AES_128_CBC_SHA");
case 0x000033: return("TLS_DHE_RSA_WITH_AES_128_CBC_SHA");
case 0x000034: return("TLS_DH_anon_WITH_AES_128_CBC_SHA");
case 0x000035: return("TLS_RSA_WITH_AES_256_CBC_SHA");
case 0x000036: return("TLS_DH_DSS_WITH_AES_256_CBC_SHA");
case 0x000037: return("TLS_DH_RSA_WITH_AES_256_CBC_SHA");
case 0x000038: return("TLS_DHE_DSS_WITH_AES_256_CBC_SHA");
case 0x000039: return("TLS_DHE_RSA_WITH_AES_256_CBC_SHA");
case 0x00003A: return("TLS_DH_anon_WITH_AES_256_CBC_SHA");
case 0x00003B: return("TLS_RSA_WITH_NULL_SHA256");
case 0x00003C: return("TLS_RSA_WITH_AES_128_CBC_SHA256");
case 0x00003D: return("TLS_RSA_WITH_AES_256_CBC_SHA256");
case 0x00003E: return("TLS_DH_DSS_WITH_AES_128_CBC_SHA256");
case 0x00003F: return("TLS_DH_RSA_WITH_AES_128_CBC_SHA256");
case 0x000040: return("TLS_DHE_DSS_WITH_AES_128_CBC_SHA256");
case 0x000041: return("TLS_RSA_WITH_CAMELLIA_128_CBC_SHA");
case 0x000042: return("TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA");
case 0x000043: return("TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA");
case 0x000044: return("TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA");
case 0x000045: return("TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA");
case 0x000046: return("TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA");
case 0x000047: return("TLS_ECDH_ECDSA_WITH_NULL_SHA");
case 0x000048: return("TLS_ECDH_ECDSA_WITH_RC4_128_SHA");
case 0x000049: return("TLS_ECDH_ECDSA_WITH_DES_CBC_SHA");
case 0x00004A: return("TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA");
case 0x00004B: return("TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA");
case 0x00004C: return("TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA");
case 0x000060: return("TLS_RSA_EXPORT1024_WITH_RC4_56_MD5");
case 0x000061: return("TLS_RSA_EXPORT1024_WITH_RC2_CBC_56_MD5");
case 0x000062: return("TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA");
case 0x000063: return("TLS_DHE_DSS_EXPORT1024_WITH_DES_CBC_SHA");
case 0x000064: return("TLS_RSA_EXPORT1024_WITH_RC4_56_SHA");
case 0x000065: return("TLS_DHE_DSS_EXPORT1024_WITH_RC4_56_SHA");
case 0x000066: return("TLS_DHE_DSS_WITH_RC4_128_SHA");
case 0x000067: return("TLS_DHE_RSA_WITH_AES_128_CBC_SHA256");
case 0x000068: return("TLS_DH_DSS_WITH_AES_256_CBC_SHA256");
case 0x000069: return("TLS_DH_RSA_WITH_AES_256_CBC_SHA256");
case 0x00006A: return("TLS_DHE_DSS_WITH_AES_256_CBC_SHA256");
case 0x00006B: return("TLS_DHE_RSA_WITH_AES_256_CBC_SHA256");
case 0x00006C: return("TLS_DH_anon_WITH_AES_128_CBC_SHA256");
case 0x00006D: return("TLS_DH_anon_WITH_AES_256_CBC_SHA256");
case 0x000084: return("TLS_RSA_WITH_CAMELLIA_256_CBC_SHA");
case 0x000085: return("TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA");
case 0x000086: return("TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA");
case 0x000087: return("TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA");
case 0x000088: return("TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA");
case 0x000089: return("TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA");
case 0x00008A: return("TLS_PSK_WITH_RC4_128_SHA");
case 0x00008B: return("TLS_PSK_WITH_3DES_EDE_CBC_SHA");
case 0x00008C: return("TLS_PSK_WITH_AES_128_CBC_SHA");
case 0x00008D: return("TLS_PSK_WITH_AES_256_CBC_SHA");
case 0x00008E: return("TLS_DHE_PSK_WITH_RC4_128_SHA");
case 0x00008F: return("TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA");
case 0x000090: return("TLS_DHE_PSK_WITH_AES_128_CBC_SHA");
case 0x000091: return("TLS_DHE_PSK_WITH_AES_256_CBC_SHA");
case 0x000092: return("TLS_RSA_PSK_WITH_RC4_128_SHA");
case 0x000093: return("TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA");
case 0x000094: return("TLS_RSA_PSK_WITH_AES_128_CBC_SHA");
case 0x000095: return("TLS_RSA_PSK_WITH_AES_256_CBC_SHA");
case 0x000096: return("TLS_RSA_WITH_SEED_CBC_SHA");
case 0x000097: return("TLS_DH_DSS_WITH_SEED_CBC_SHA");
case 0x000098: return("TLS_DH_RSA_WITH_SEED_CBC_SHA");
case 0x000099: return("TLS_DHE_DSS_WITH_SEED_CBC_SHA");
case 0x00009A: return("TLS_DHE_RSA_WITH_SEED_CBC_SHA");
case 0x00009B: return("TLS_DH_anon_WITH_SEED_CBC_SHA");
case 0x00009C: return("TLS_RSA_WITH_AES_128_GCM_SHA256");
case 0x00009D: return("TLS_RSA_WITH_AES_256_GCM_SHA384");
case 0x00009E: return("TLS_DHE_RSA_WITH_AES_128_GCM_SHA256");
case 0x00009F: return("TLS_DHE_RSA_WITH_AES_256_GCM_SHA384");
case 0x0000A0: return("TLS_DH_RSA_WITH_AES_128_GCM_SHA256");
case 0x0000A1: return("TLS_DH_RSA_WITH_AES_256_GCM_SHA384");
case 0x0000A2: return("TLS_DHE_DSS_WITH_AES_128_GCM_SHA256");
case 0x0000A3: return("TLS_DHE_DSS_WITH_AES_256_GCM_SHA384");
case 0x0000A4: return("TLS_DH_DSS_WITH_AES_128_GCM_SHA256");
case 0x0000A5: return("TLS_DH_DSS_WITH_AES_256_GCM_SHA384");
case 0x0000A6: return("TLS_DH_anon_WITH_AES_128_GCM_SHA256");
case 0x0000A7: return("TLS_DH_anon_WITH_AES_256_GCM_SHA384");
case 0x0000A8: return("TLS_PSK_WITH_AES_128_GCM_SHA256");
case 0x0000A9: return("TLS_PSK_WITH_AES_256_GCM_SHA384");
case 0x0000AA: return("TLS_DHE_PSK_WITH_AES_128_GCM_SHA256");
case 0x0000AB: return("TLS_DHE_PSK_WITH_AES_256_GCM_SHA384");
case 0x0000AC: return("TLS_RSA_PSK_WITH_AES_128_GCM_SHA256");
case 0x0000AD: return("TLS_RSA_PSK_WITH_AES_256_GCM_SHA384");
case 0x0000AE: return("TLS_PSK_WITH_AES_128_CBC_SHA256");
case 0x0000AF: return("TLS_PSK_WITH_AES_256_CBC_SHA384");
case 0x0000B0: return("TLS_PSK_WITH_NULL_SHA256");
case 0x0000B1: return("TLS_PSK_WITH_NULL_SHA384");
case 0x0000B2: return("TLS_DHE_PSK_WITH_AES_128_CBC_SHA256");
case 0x0000B3: return("TLS_DHE_PSK_WITH_AES_256_CBC_SHA384");
case 0x0000B4: return("TLS_DHE_PSK_WITH_NULL_SHA256");
case 0x0000B5: return("TLS_DHE_PSK_WITH_NULL_SHA384");
case 0x0000B6: return("TLS_RSA_PSK_WITH_AES_128_CBC_SHA256");
case 0x0000B7: return("TLS_RSA_PSK_WITH_AES_256_CBC_SHA384");
case 0x0000B8: return("TLS_RSA_PSK_WITH_NULL_SHA256");
case 0x0000B9: return("TLS_RSA_PSK_WITH_NULL_SHA384");
case 0x0000BA: return("TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256");
case 0x0000BB: return("TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256");
case 0x0000BC: return("TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256");
case 0x0000BD: return("TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256");
case 0x0000BE: return("TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256");
case 0x0000BF: return("TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256");
case 0x0000C0: return("TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256");
case 0x0000C1: return("TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256");
case 0x0000C2: return("TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256");
case 0x0000C3: return("TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256");
case 0x0000C4: return("TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256");
case 0x0000C5: return("TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256");
case 0x0000FF: return("TLS_EMPTY_RENEGOTIATION_INFO_SCSV");
case 0x00c001: return("TLS_ECDH_ECDSA_WITH_NULL_SHA");
case 0x00c002: return("TLS_ECDH_ECDSA_WITH_RC4_128_SHA");
case 0x00c003: return("TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA");
case 0x00c004: return("TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA");
case 0x00c005: return("TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA");
case 0x00c006: return("TLS_ECDHE_ECDSA_WITH_NULL_SHA");
case 0x00c007: return("TLS_ECDHE_ECDSA_WITH_RC4_128_SHA");
case 0x00c008: return("TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA");
case 0x00c009: return("TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA");
case 0x00c00a: return("TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA");
case 0x00c00b: return("TLS_ECDH_RSA_WITH_NULL_SHA");
case 0x00c00c: return("TLS_ECDH_RSA_WITH_RC4_128_SHA");
case 0x00c00d: return("TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA");
case 0x00c00e: return("TLS_ECDH_RSA_WITH_AES_128_CBC_SHA");
case 0x00c00f: return("TLS_ECDH_RSA_WITH_AES_256_CBC_SHA");
case 0x00c010: return("TLS_ECDHE_RSA_WITH_NULL_SHA");
case 0x00c011: return("TLS_ECDHE_RSA_WITH_RC4_128_SHA");
case 0x00c012: return("TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA");
case 0x00c013: return("TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA");
case 0x00c014: return("TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA");
case 0x00c015: return("TLS_ECDH_anon_WITH_NULL_SHA");
case 0x00c016: return("TLS_ECDH_anon_WITH_RC4_128_SHA");
case 0x00c017: return("TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA");
case 0x00c018: return("TLS_ECDH_anon_WITH_AES_128_CBC_SHA");
case 0x00c019: return("TLS_ECDH_anon_WITH_AES_256_CBC_SHA");
case 0x00C01A: return("TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA");
case 0x00C01B: return("TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA");
case 0x00C01C: return("TLS_SRP_SHA_DSS_WITH_3DES_EDE_CBC_SHA");
case 0x00C01D: return("TLS_SRP_SHA_WITH_AES_128_CBC_SHA");
case 0x00C01E: return("TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA");
case 0x00C01F: return("TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA");
case 0x00C020: return("TLS_SRP_SHA_WITH_AES_256_CBC_SHA");
case 0x00C021: return("TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA");
case 0x00C022: return("TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA");
case 0x00C023: return("TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256");
case 0x00C024: return("TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384");
case 0x00C025: return("TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256");
case 0x00C026: return("TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384");
case 0x00C027: return("TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256");
case 0x00C028: return("TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384");
case 0x00C029: return("TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256");
case 0x00C02A: return("TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384");
case 0x00C02B: return("TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256");
case 0x00C02C: return("TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384");
case 0x00C02D: return("TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256");
case 0x00C02E: return("TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384");
case 0x00C02F: return("TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256");
case 0x00C030: return("TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384");
case 0x00C031: return("TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256");
case 0x00C032: return("TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384");
case 0x00C033: return("TLS_ECDHE_PSK_WITH_RC4_128_SHA");
case 0x00C034: return("TLS_ECDHE_PSK_WITH_3DES_EDE_CBC_SHA");
case 0x00C035: return("TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA");
case 0x00C036: return("TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA");
case 0x00C037: return("TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256");
case 0x00C038: return("TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384");
case 0x00C039: return("TLS_ECDHE_PSK_WITH_NULL_SHA");
case 0x00C03A: return("TLS_ECDHE_PSK_WITH_NULL_SHA256");
case 0x00C03B: return("TLS_ECDHE_PSK_WITH_NULL_SHA384");
case 0x00CC13: return("TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CC14: return("TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CC15: return("TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CCA8: return("TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CCA9: return("TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CCAA: return("TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CCAB: return("TLS_PSK_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CCAC: return("TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CCAD: return("TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256");
case 0x00CCAE: return("TLS_RSA_PSK_WITH_CHACHA20_POLY1305_SHA256");
case 0x00E410: return("TLS_RSA_WITH_ESTREAM_SALSA20_SHA1");
case 0x00E411: return("TLS_RSA_WITH_SALSA20_SHA1");
case 0x00E412: return("TLS_ECDHE_RSA_WITH_ESTREAM_SALSA20_SHA1");
case 0x00E413: return("TLS_ECDHE_RSA_WITH_SALSA20_SHA1");
case 0x00E414: return("TLS_ECDHE_ECDSA_WITH_ESTREAM_SALSA20_SHA1");
case 0x00E415: return("TLS_ECDHE_ECDSA_WITH_SALSA20_SHA1");
case 0x00E416: return("TLS_PSK_WITH_ESTREAM_SALSA20_SHA1");
case 0x00E417: return("TLS_PSK_WITH_SALSA20_SHA1");
case 0x00E418: return("TLS_ECDHE_PSK_WITH_ESTREAM_SALSA20_SHA1");
case 0x00E419: return("TLS_ECDHE_PSK_WITH_SALSA20_SHA1");
case 0x00E41A: return("TLS_RSA_PSK_WITH_ESTREAM_SALSA20_SHA1");
case 0x00E41B: return("TLS_RSA_PSK_WITH_SALSA20_SHA1");
case 0x00E41C: return("TLS_DHE_PSK_WITH_ESTREAM_SALSA20_SHA1");
case 0x00E41D: return("TLS_DHE_PSK_WITH_SALSA20_SHA1");
case 0x00E41E: return("TLS_DHE_RSA_WITH_ESTREAM_SALSA20_SHA1");
case 0x00E41F: return("TLS_DHE_RSA_WITH_SALSA20_SHA1");
case 0x00fefe: return("TLS_RSA_FIPS_WITH_DES_CBC_SHA");
case 0x00feff: return("TLS_RSA_FIPS_WITH_3DES_EDE_CBC_SHA");
case 0x00ffe0: return("TLS_RSA_FIPS_WITH_3DES_EDE_CBC_SHA");
case 0x00ffe1: return("TLS_RSA_FIPS_WITH_DES_CBC_SHA");
case 0x010080: return("SSL2_RC4_128_WITH_MD5");
case 0x020080: return("SSL2_RC4_128_EXPORT40_WITH_MD5");
case 0x030080: return("SSL2_RC2_128_CBC_WITH_MD5");
case 0x040080: return("SSL2_RC2_128_CBC_EXPORT40_WITH_MD5");
case 0x050080: return("SSL2_IDEA_128_CBC_WITH_MD5");
case 0x060040: return("SSL2_DES_64_CBC_WITH_MD5");
case 0x0700c0: return("SSL2_DES_192_EDE3_CBC_WITH_MD5");
case 0x080080: return("SSL2_RC4_64_WITH_MD5");
case 0x001301: return("TLS_AES_128_GCM_SHA256");
case 0x001302: return("TLS_AES_256_GCM_SHA384");
case 0x001303: return("TLS_CHACHA20_POLY1305_SHA256");
case 0x001304: return("TLS_AES_128_CCM_SHA256");
case 0x001305: return("TLS_AES_128_CCM_8_SHA256");
default:
{
static char buf[8];
snprintf(buf, sizeof(buf), "0X%04X", cipher);
return(buf);
}
}
}
/* ******************************************************************** */
static int ndpi_is_other_char(char c) {
return((c == '.')
|| (c == ' ')
|| (c == '@')
|| (c == '/')
);
}
/* ******************************************************************** */
static int ndpi_is_valid_char(char c) {
if(ispunct(c) && (!ndpi_is_other_char(c)))
return(0);
else
return(isdigit(c)
|| isalpha(c)
|| ndpi_is_other_char(c));
}
/* ******************************************************************** */
static int ndpi_find_non_eng_bigrams(struct ndpi_detection_module_struct *ndpi_struct,
char *str) {
char s[3];
if((isdigit(str[0]) && isdigit(str[1]))
|| ndpi_is_other_char(str[0])
|| ndpi_is_other_char(str[1])
)
return(1);
s[0] = tolower(str[0]), s[1] = tolower(str[1]), s[2] = '\0';
return(ndpi_match_bigram(ndpi_struct, &ndpi_struct->bigrams_automa, s));
}
/* ******************************************************************** */
/* #define PRINT_STRINGS 1 */
int ndpi_has_human_readeable_string(struct ndpi_detection_module_struct *ndpi_struct,
char *buffer, u_int buffer_size,
u_int8_t min_string_match_len,
char *outbuf, u_int outbuf_len) {
u_int ret = 0, i = 0, do_cr = 0, len = 0, o_idx = 0, being_o_idx = 0;
if(buffer_size <= 0)
return(0);
outbuf_len--;
outbuf[outbuf_len] = '\0';
for(i=0; i<buffer_size-2; i++) {
if(ndpi_is_valid_char(buffer[i])
&& ndpi_is_valid_char(buffer[i+1])
&& ndpi_find_non_eng_bigrams(ndpi_struct, &buffer[i])) {
#ifdef PRINT_STRINGS
printf("%c%c", buffer[i], buffer[i+1]);
#endif
if(o_idx < outbuf_len) outbuf[o_idx++] = buffer[i];
if(o_idx < outbuf_len) outbuf[o_idx++] = buffer[i+1];
do_cr = 1, i += 1, len += 2;
} else {
if(ndpi_is_valid_char(buffer[i]) && do_cr) {
#ifdef PRINT_STRINGS
printf("%c", buffer[i]);
#endif
if(o_idx < outbuf_len) outbuf[o_idx++] = buffer[i];
len += 1;
}
// printf("->> %c%c\n", isprint(buffer[i]) ? buffer[i] : '.', isprint(buffer[i+1]) ? buffer[i+1] : '.');
if(do_cr) {
if(len > min_string_match_len)
ret = 1;
else {
o_idx = being_o_idx;
being_o_idx = o_idx;
outbuf[o_idx] = '\0';
}
#ifdef PRINT_STRINGS
printf(" [len: %u]%s\n", len, ret ? "<-- HIT" : "");
#endif
if(ret)
break;
do_cr = 0, len = 0;
}
}
}
#ifdef PRINT_STRINGS
printf("=======>> Found string: %u\n", ret);
#endif
return(ret);
}
/* ********************************** */
char* ndpi_ssl_version2str(u_int16_t version, u_int8_t *unknown_tls_version) {
static char v[12];
*unknown_tls_version = 0;
switch(version) {
case 0x0300: return("SSLv3");
case 0x0301: return("TLSv1");
case 0x0302: return("TLSv1.1");
case 0x0303: return("TLSv1.2");
case 0x0304: return("TLSv1.3");
case 0XFB1A: return("TLSv1.3 (Fizz)"); /* https://engineering.fb.com/security/fizz/ */
case 0XFEFF: return("DTLSv1.0");
case 0XFEFD: return("DTLSv1.2");
}
if((version >= 0x7f00) && (version <= 0x7fff))
return("TLSv1.3 (draft)");
*unknown_tls_version = 1;
snprintf(v, sizeof(v), "TLS (%04X)", version);
return(v);
}
/* ***************************************************** */
void ndpi_patchIPv6Address(char *str) {
int i = 0, j = 0;
while(str[i] != '\0') {
if((str[i] == ':')
&& (str[i+1] == '0')
&& (str[i+2] == ':')) {
str[j++] = ':';
str[j++] = ':';
i += 3;
} else
str[j++] = str[i++];
}
if(str[j] != '\0') str[j] = '\0';
}
/* ********************************** */
void ndpi_user_pwd_payload_copy(u_int8_t *dest, u_int dest_len,
u_int offset,
const u_int8_t *src, u_int src_len) {
u_int i, j=0, k = dest_len-1;
for(i=offset; (i<src_len) && (j<=k); i++) {
if((j == k) || (src[i] < ' '))
break;
dest[j++] = src[i];
}
dest[j <=k ? j : k] = '\0';
}
/* ********************************** */
/* ********************************** */
/* http://web.mit.edu/freebsd/head/contrib/wpa/src/utils/base64.c */
static const unsigned char base64_table[65] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/**
* base64_decode - Base64 decode
* @src: Data to be decoded
* @len: Length of the data to be decoded
* @out_len: Pointer to output length variable
* Returns: Allocated buffer of out_len bytes of decoded data,
* or %NULL on failure
*
* Caller is responsible for freeing the returned buffer.
*/
u_char* ndpi_base64_decode(const u_char *src, size_t len, size_t *out_len) {
u_char dtable[256], *out, *pos, block[4], tmp;
size_t i, count, olen;
int pad = 0;
memset(dtable, 0x80, 256);
for (i = 0; i < sizeof(base64_table) - 1; i++)
dtable[base64_table[i]] = (u_char) i;
dtable['='] = 0;
count = 0;
for (i = 0; i < len; i++) {
if (dtable[src[i]] != 0x80)
count++;
}
if (count == 0 || count % 4)
return NULL;
olen = count / 4 * 3;
pos = out = ndpi_malloc(olen);
if (out == NULL)
return NULL;
count = 0;
for (i = 0; i < len; i++) {
tmp = dtable[src[i]];
if (tmp == 0x80)
continue;
if (src[i] == '=')
pad++;
block[count] = tmp;
count++;
if (count == 4) {
*pos++ = (block[0] << 2) | (block[1] >> 4);
*pos++ = (block[1] << 4) | (block[2] >> 2);
*pos++ = (block[2] << 6) | block[3];
count = 0;
if (pad) {
if (pad == 1)
pos--;
else if (pad == 2)
pos -= 2;
else {
/* Invalid padding */
ndpi_free(out);
return NULL;
}
break;
}
}
}
*out_len = pos - out;
return out;
}
/* ********************************** */
char* ndpi_base64_encode(unsigned char const* bytes_to_encode, size_t in_len) {
size_t len = 0, ret_size;
char *ret;
int i = 0;
unsigned char char_array_3[3];
unsigned char char_array_4[4];
ret_size = ((in_len+2)/3)*4;
if((ret = (char*)ndpi_malloc(ret_size+1)) == NULL)
return NULL;
while (in_len--) {
char_array_3[i++] = *(bytes_to_encode++);
if(i == 3) {
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for(i = 0; i < 4; i++)
ret[len++] = base64_table[char_array_4[i]];
i = 0;
}
}
if(i) {
for(int j = i; j < 3; j++)
char_array_3[j] = '\0';
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for(int j = 0; (j < i + 1); j++)
ret[len++] = base64_table[char_array_4[j]];
while((i++ < 3))
ret[len++] = '=';
}
ret[len++] = '\0';
return ret;
}
/* ********************************** */
/* ********************************** */
int ndpi_flow2json(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow,
u_int8_t ip_version,
u_int8_t l4_protocol, u_int16_t vlan_id,
u_int32_t src_v4, u_int32_t dst_v4,
struct ndpi_in6_addr *src_v6, struct ndpi_in6_addr *dst_v6,
u_int16_t src_port, u_int16_t dst_port,
ndpi_protocol l7_protocol,
ndpi_serializer *serializer) {
char buf[64], src_name[32], dst_name[32];
if(ndpi_init_serializer(serializer, ndpi_serialization_format_json) == -1)
return(-1);
if(ip_version == 4) {
inet_ntop(AF_INET, &src_v4, src_name, sizeof(src_name));
inet_ntop(AF_INET, &dst_v4, dst_name, sizeof(dst_name));
} else {
inet_ntop(AF_INET6, src_v6, src_name, sizeof(src_name));
inet_ntop(AF_INET6, dst_v6, dst_name, sizeof(dst_name));
/* For consistency across platforms replace :0: with :: */
ndpi_patchIPv6Address(src_name), ndpi_patchIPv6Address(dst_name);
}
ndpi_serialize_string_string(serializer, "src_ip", src_name);
ndpi_serialize_string_string(serializer, "dest_ip", dst_name);
if(src_port) ndpi_serialize_string_uint32(serializer, "src_port", src_port);
if(dst_port) ndpi_serialize_string_uint32(serializer, "dst_port", dst_port);
switch(l4_protocol) {
case IPPROTO_TCP:
ndpi_serialize_string_string(serializer, "proto", "TCP");
break;
case IPPROTO_UDP:
ndpi_serialize_string_string(serializer, "proto", "UDP");
break;
case IPPROTO_ICMP:
ndpi_serialize_string_string(serializer, "proto", "ICMP");
break;
default:
ndpi_serialize_string_uint32(serializer, "proto", l4_protocol);
break;
}
ndpi_serialize_start_of_block(serializer, "ndpi");
ndpi_serialize_string_string(serializer, "proto", ndpi_protocol2name(ndpi_struct, l7_protocol, buf, sizeof(buf)));
if(l7_protocol.category != NDPI_PROTOCOL_CATEGORY_UNSPECIFIED)
ndpi_serialize_string_string(serializer, "category", ndpi_category_get_name(ndpi_struct, l7_protocol.category));
ndpi_serialize_end_of_block(serializer);
if(flow == NULL) return(0);
switch(l7_protocol.master_protocol ? l7_protocol.master_protocol : l7_protocol.app_protocol) {
case NDPI_PROTOCOL_DHCP:
ndpi_serialize_start_of_block(serializer, "dhcp");
ndpi_serialize_string_string(serializer, "fingerprint", flow->protos.dhcp.fingerprint);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_BITTORRENT:
{
u_int i, j, n = 0;
char bittorent_hash[32];
for(i=0, j = 0; j < sizeof(bittorent_hash)-1; i++) {
sprintf(&bittorent_hash[j], "%02x",
flow->protos.bittorrent.hash[i]);
j += 2, n += flow->protos.bittorrent.hash[i];
}
if(n == 0) bittorent_hash[0] = '\0';
ndpi_serialize_start_of_block(serializer, "bittorrent");
ndpi_serialize_string_string(serializer, "hash", bittorent_hash);
ndpi_serialize_end_of_block(serializer);
}
break;
case NDPI_PROTOCOL_DNS:
ndpi_serialize_start_of_block(serializer, "dns");
if(flow->host_server_name[0] != '\0')
ndpi_serialize_string_string(serializer, "query", (const char*)flow->host_server_name);
ndpi_serialize_string_uint32(serializer, "num_queries", flow->protos.dns.num_queries);
ndpi_serialize_string_uint32(serializer, "num_answers", flow->protos.dns.num_answers);
ndpi_serialize_string_uint32(serializer, "reply_code", flow->protos.dns.reply_code);
ndpi_serialize_string_uint32(serializer, "query_type", flow->protos.dns.query_type);
ndpi_serialize_string_uint32(serializer, "rsp_type", flow->protos.dns.rsp_type);
inet_ntop(AF_INET, &flow->protos.dns.rsp_addr, buf, sizeof(buf));
ndpi_serialize_string_string(serializer, "rsp_addr", buf);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_MDNS:
ndpi_serialize_start_of_block(serializer, "mdns");
ndpi_serialize_string_string(serializer, "answer", flow->protos.mdns.answer);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_UBNTAC2:
ndpi_serialize_start_of_block(serializer, "ubntac2");
ndpi_serialize_string_string(serializer, "version", flow->protos.ubntac2.version);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_KERBEROS:
ndpi_serialize_start_of_block(serializer, "kerberos");
ndpi_serialize_string_string(serializer, "hostname", flow->protos.kerberos.hostname);
ndpi_serialize_string_string(serializer, "domain", flow->protos.kerberos.domain);
ndpi_serialize_string_string(serializer, "username", flow->protos.kerberos.username);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_TELNET:
ndpi_serialize_start_of_block(serializer, "telnet");
ndpi_serialize_string_string(serializer, "username", flow->protos.telnet.username);
ndpi_serialize_string_string(serializer, "password", flow->protos.telnet.password);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_HTTP:
ndpi_serialize_start_of_block(serializer, "http");
if(flow->host_server_name[0] != '\0')
ndpi_serialize_string_string(serializer, "hostname", (const char*)flow->host_server_name);
if(flow->http.url != NULL){
ndpi_serialize_string_string(serializer, "url", flow->http.url);
ndpi_serialize_string_uint32(serializer, "code", flow->http.response_status_code);
ndpi_serialize_string_string(serializer, "content_type", flow->http.content_type);
ndpi_serialize_string_string(serializer, "user_agent", flow->http.user_agent);
}
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_MAIL_IMAP:
ndpi_serialize_start_of_block(serializer, "imap");
ndpi_serialize_string_string(serializer, "user", flow->protos.ftp_imap_pop_smtp.username);
ndpi_serialize_string_string(serializer, "password", flow->protos.ftp_imap_pop_smtp.password);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_MAIL_POP:
ndpi_serialize_start_of_block(serializer, "pop");
ndpi_serialize_string_string(serializer, "user", flow->protos.ftp_imap_pop_smtp.username);
ndpi_serialize_string_string(serializer, "password", flow->protos.ftp_imap_pop_smtp.password);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_MAIL_SMTP:
ndpi_serialize_start_of_block(serializer, "smtp");
ndpi_serialize_string_string(serializer, "user", flow->protos.ftp_imap_pop_smtp.username);
ndpi_serialize_string_string(serializer, "password", flow->protos.ftp_imap_pop_smtp.password);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_FTP_CONTROL:
ndpi_serialize_start_of_block(serializer, "ftp");
ndpi_serialize_string_string(serializer, "user", flow->protos.ftp_imap_pop_smtp.username);
ndpi_serialize_string_string(serializer, "password", flow->protos.ftp_imap_pop_smtp.password);
ndpi_serialize_string_uint32(serializer, "auth_failed", flow->protos.ftp_imap_pop_smtp.auth_failed);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_SSH:
ndpi_serialize_start_of_block(serializer, "ssh");
ndpi_serialize_string_string(serializer, "client_signature", flow->protos.ssh.client_signature);
ndpi_serialize_string_string(serializer, "server_signature", flow->protos.ssh.server_signature);
ndpi_serialize_string_string(serializer, "hassh_client", flow->protos.ssh.hassh_client);
ndpi_serialize_string_string(serializer, "hassh_server", flow->protos.ssh.hassh_server);
ndpi_serialize_end_of_block(serializer);
break;
case NDPI_PROTOCOL_TLS:
if(flow->protos.stun_ssl.ssl.ssl_version) {
char notBefore[32], notAfter[32];
struct tm a, b, *before = NULL, *after = NULL;
u_int i, off;
u_int8_t unknown_tls_version;
char *version = ndpi_ssl_version2str(flow->protos.stun_ssl.ssl.ssl_version, &unknown_tls_version);
if(flow->protos.stun_ssl.ssl.notBefore)
before = gmtime_r((const time_t *)&flow->protos.stun_ssl.ssl.notBefore, &a);
if(flow->protos.stun_ssl.ssl.notAfter)
after = gmtime_r((const time_t *)&flow->protos.stun_ssl.ssl.notAfter, &b);
if(!unknown_tls_version) {
ndpi_serialize_start_of_block(serializer, "tls");
ndpi_serialize_string_string(serializer, "version", version);
ndpi_serialize_string_string(serializer, "client_requested_server_name",
flow->protos.stun_ssl.ssl.client_requested_server_name);
if(flow->protos.stun_ssl.ssl.server_names)
ndpi_serialize_string_string(serializer, "server_names", flow->protos.stun_ssl.ssl.server_names);
if(before) {
strftime(notBefore, sizeof(notBefore), "%F %T", before);
ndpi_serialize_string_string(serializer, "notbefore", notBefore);
}
if(after) {
strftime(notAfter, sizeof(notAfter), "%F %T", after);
ndpi_serialize_string_string(serializer, "notafter", notAfter);
}
ndpi_serialize_string_string(serializer, "ja3", flow->protos.stun_ssl.ssl.ja3_client);
ndpi_serialize_string_string(serializer, "ja3s", flow->protos.stun_ssl.ssl.ja3_server);
ndpi_serialize_string_uint32(serializer, "unsafe_cipher", flow->protos.stun_ssl.ssl.server_unsafe_cipher);
ndpi_serialize_string_string(serializer, "cipher", ndpi_cipher2str(flow->protos.stun_ssl.ssl.server_cipher));
if(flow->protos.stun_ssl.ssl.issuerDN)
ndpi_serialize_string_string(serializer, "issuerDN", flow->protos.stun_ssl.ssl.issuerDN);
if(flow->protos.stun_ssl.ssl.subjectDN)
ndpi_serialize_string_string(serializer, "issuerDN", flow->protos.stun_ssl.ssl.subjectDN);
if(flow->protos.stun_ssl.ssl.alpn)
ndpi_serialize_string_string(serializer, "alpn", flow->protos.stun_ssl.ssl.alpn);
if(flow->protos.stun_ssl.ssl.tls_supported_versions)
ndpi_serialize_string_string(serializer, "tls_supported_versions", flow->protos.stun_ssl.ssl.tls_supported_versions);
if(flow->l4.tcp.tls.sha1_certificate_fingerprint[0] != '\0') {
for(i=0, off=0; i<20; i++) {
int rc = snprintf(&buf[off], sizeof(buf)-off,"%s%02X", (i > 0) ? ":" : "",
flow->l4.tcp.tls.sha1_certificate_fingerprint[i] & 0xFF);
if(rc <= 0) break; else off += rc;
}
ndpi_serialize_string_string(serializer, "fingerprint", buf);
}
ndpi_serialize_end_of_block(serializer);
}
}
break;
} /* switch */
return(0);
}
/* ********************************** */
const char* ndpi_tunnel2str(ndpi_packet_tunnel tt) {
switch(tt) {
case ndpi_no_tunnel:
return("No-Tunnel");
break;
case ndpi_gtp_tunnel:
return("GTP");
break;
case ndpi_capwap_tunnel:
return("CAPWAP");
break;
case ndpi_tzsp_tunnel:
return("TZSP");
break;
case ndpi_l2tp_tunnel:
return("L2TP");
break;
}
return("");
}
/* ********************************** */
/*
/dv/vulnerabilities/xss_r/?name=%3Cscript%3Econsole.log%28%27JUL2D3WXHEGWRAFJE2PI7OS71Z4Z8RFUHXGNFLUFYVP6M3OL55%27%29%3Bconsole.log%28document.cookie%29%3B%3C%2Fscript%3E
/dv/vulnerabilities/sqli/?id=1%27+and+1%3D1+union+select+null%2C+table_name+from+information_schema.tables%23&Submit=Submit
*/
/* https://www.rosettacode.org/wiki/URL_decoding#C */
static int ishex(int x) {
return(x >= '0' && x <= '9') || (x >= 'a' && x <= 'f') || (x >= 'A' && x <= 'F');
}
/* ********************************** */
static int ndpi_url_decode(const char *s, char *out) {
char *o;
const char *end = s + strlen(s);
int c;
for(o = out; s <= end; o++) {
c = *s++;
if(c == '+') c = ' ';
else if(c == '%' && (!ishex(*s++)||
!ishex(*s++)||
!sscanf(s - 2, "%2x", (unsigned int*)&c)))
return(-1);
if(out) *o = c;
}
return(o - out);
}
/* ********************************** */
static int ndpi_is_sql_injection(char* query) {
struct libinjection_sqli_state state;
size_t qlen = strlen(query);
libinjection_sqli_init(&state, query, qlen, FLAG_NONE);
return libinjection_is_sqli(&state);
}
/* ********************************** */
static int ndpi_is_xss_injection(char* query) {
size_t qlen = strlen(query);
return libinjection_xss(query, qlen);
}
/* ********************************** */
#ifdef HAVE_PCRE
static void ndpi_compile_rce_regex() {
const char *pcreErrorStr;
int pcreErrorOffset;
for(int i = 0; i < N_RCE_REGEX; i++) {
comp_rx[i] = (struct pcre_struct*)ndpi_malloc(sizeof(struct pcre_struct));
comp_rx[i]->compiled = pcre_compile(rce_regex[i], 0, &pcreErrorStr,
&pcreErrorOffset, NULL);
if(comp_rx[i]->compiled == NULL) {
#ifdef DEBUG
NDPI_LOG_ERR(ndpi_str, "ERROR: Could not compile '%s': %s\n", rce_regex[i],
pcreErrorStr);
#endif
continue;
}
comp_rx[i]->optimized = pcre_study(comp_rx[i]->compiled, 0, &pcreErrorStr);
#ifdef DEBUG
if(pcreErrorStr != NULL) {
NDPI_LOG_ERR(ndpi_str, "ERROR: Could not study '%s': %s\n", rce_regex[i],
pcreErrorStr);
}
#endif
}
free((void *)pcreErrorStr);
}
static int ndpi_is_rce_injection(char* query) {
if (!initialized_comp_rx) {
ndpi_compile_rce_regex();
initialized_comp_rx = 1;
}
int pcreExecRet;
int subStrVec[30];
for(int i = 0; i < N_RCE_REGEX; i++) {
unsigned int length = strlen(query);
pcreExecRet = pcre_exec(comp_rx[i]->compiled,
comp_rx[i]->optimized,
query, length, 0, 0, subStrVec, 30);
if (pcreExecRet >= 0) {
return 1;
}
#ifdef DEBUG
else {
switch(pcreExecRet) {
case PCRE_ERROR_NOMATCH:
NDPI_LOG_ERR(ndpi_str, "ERROR: String did not match the pattern\n");
break;
case PCRE_ERROR_NULL:
NDPI_LOG_ERR(ndpi_str, "ERROR: Something was null\n");
break;
case PCRE_ERROR_BADOPTION:
NDPI_LOG_ERR(ndpi_str, "ERROR: A bad option was passed\n");
break;
case PCRE_ERROR_BADMAGIC:
NDPI_LOG_ERR(ndpi_str, "ERROR: Magic number bad (compiled re corrupt?)\n");
break;
case PCRE_ERROR_UNKNOWN_NODE:
NDPI_LOG_ERR(ndpi_str, "ERROR: Something kooky in the compiled re\n");
break;
case PCRE_ERROR_NOMEMORY:
NDPI_LOG_ERR(ndpi_str, "ERROR: Ran out of memory\n");
break;
default:
NDPI_LOG_ERR(ndpi_str, "ERROR: Unknown error\n");
break;
}
}
#endif
}
size_t ushlen = sizeof(ush_commands) / sizeof(ush_commands[0]);
for(int i = 0; i < ushlen; i++) {
if(strstr(query, ush_commands[i]) != NULL) {
return 1;
}
}
size_t pwshlen = sizeof(pwsh_commands) / sizeof(pwsh_commands[0]);
for(int i = 0; i < pwshlen; i++) {
if(strstr(query, pwsh_commands[i]) != NULL) {
return 1;
}
}
return 0;
}
#endif
/* ********************************** */
ndpi_risk ndpi_validate_url(char *url) {
char *orig_str = NULL, *str = NULL, *question_mark = strchr(url, '?');
ndpi_risk rc = NDPI_NO_RISK;
if(question_mark) {
char *tmp;
orig_str = str = ndpi_strdup(&question_mark[1]); /* Skip ? */
if(!str) goto validate_rc;
str = strtok_r(str, "&", &tmp);
while(str != NULL) {
char *value = strchr(str, '=');
char *decoded;
if(!value)
break;
else
value = &value[1];
if(value[0] != '\0') {
if(!(decoded = (char*)ndpi_malloc(strlen(value)+1)))
break;
if(ndpi_url_decode(value, decoded) < 0) {
/* Invalid string */
} else if(decoded[0] != '\0') {
/* Valid string */
if(ndpi_is_xss_injection(decoded))
rc = NDPI_URL_POSSIBLE_XSS;
else if(ndpi_is_sql_injection(decoded))
rc = NDPI_URL_POSSIBLE_SQL_INJECTION;
#ifdef HAVE_PCRE
else if(ndpi_is_rce_injection(decoded))
rc = NDPI_URL_POSSIBLE_RCE_INJECTION;
#endif
#ifdef URL_CHECK_DEBUG
printf("=>> [rc: %u] %s\n", rc, decoded);
#endif
}
ndpi_free(decoded);
if(rc != NDPI_NO_RISK)
break;
}
str = strtok_r(NULL, "&", &tmp);
}
}
validate_rc:
if(orig_str) ndpi_free(orig_str);
return(rc);
}
/* ******************************************************************** */
u_int8_t ndpi_is_protocol_detected(struct ndpi_detection_module_struct *ndpi_str,
ndpi_protocol proto) {
if((proto.master_protocol != NDPI_PROTOCOL_UNKNOWN)
|| (proto.app_protocol != NDPI_PROTOCOL_UNKNOWN)
|| (proto.category != NDPI_PROTOCOL_CATEGORY_UNSPECIFIED))
return(1);
else
return(0);
}
/* ******************************************************************** */
const char* ndpi_risk2str(ndpi_risk risk) {
switch(risk) {
case NDPI_URL_POSSIBLE_XSS:
return("XSS attack");
case NDPI_URL_POSSIBLE_SQL_INJECTION:
return("SQL injection");
case NDPI_URL_POSSIBLE_RCE_INJECTION:
return("RCE injection");
case NDPI_BINARY_APPLICATION_TRANSFER:
return("Binary application transfer");
case NDPI_KNOWN_PROTOCOL_ON_NON_STANDARD_PORT:
return("Known protocol on non standard port");
default:
return("");
}
}
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