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main.c
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// Copyright (c) 2016, Yahoo Inc.
// Copyrights licensed under the New BSD License. See the
// accompanying LICENSE.txt file for terms.
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <time.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/time.h>
#include <inttypes.h>
// openssl headers
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/err.h>
// libevent
#include <event.h>
#include <event2/event.h>
#include <event2/bufferevent_ssl.h>
#include <event2/dns.h>
#include <event2/util.h>
// tls-scan
#include <proto-adapters.h>
#include <common.h>
#include <cert-parser.h>
extern void gnutls13_init(struct options *op);
extern int gnutls13_session_init(client_t *cli, int sock_fd);
extern ts_status_t gnutls13_handshake(client_t *cli, int sock_fd);
extern void gnutls13_session_deinit(client_t *cli);
extern void gnutls13_deinit(struct options *op);
/*
* openssl tutorial: http://www.linuxjournal.com/article/5487?page=0,1http://www.linuxjournal.com/article/5487?page=0,1s
*/
/* https://www.openssl.org/docs/manmaster/apps/ciphers.html */
static const char *default_ciphers = "ALL:aNULL:eNULL:NULL";
static const char *sslv2_ciphers =
"RC4-MD5:EXP-RC4-MD5:RC2-MD5:EXP-RC2-MD5:IDEA-CBC-MD5:DES-CBC-MD5:DES-CBC3-MD5";
static const char *sslv3_ciphers =
"NULL-MD5:NULL-SHA:EXP-RC4-MD5:RC4-MD5:RC4-SHA:EXP-RC2-CBC-MD5:IDEA-CBC-SHA:EXP-DES-CBC-SHA:DES-CBC-SHA:DES-CBC3-SHA:EXP-EDH-DSS-DES-CBC-SHA:EDH-DSS-CBC-SHA:EDH-DSS-DES-CBC3-SHA:EXP-EDH-RSA-DES-CBC-SHA:EDH-RSA-DES-CBC-SHA:EDH-RSA-DES-CBC3-SHA:EXP-ADH-RC4-MD5:ADH-RC4-MD5:EXP-ADH-DES-CBC-SHA:ADH-DES-CBC-SHA:ADH-DES-CBC3-SHA:EXP1024-DES-CBC-SHA:EXP1024-RC4-SHA:EXP1024-DHE-DSS-DES-CBC-SHA:EXP1024-DHE-DSS-RC4-SHA:DHE-DSS-RC4-SHA";
static const char *tlsv1_ciphers =
"NULL-MD5:NULL-SHA:EXP-RC4-MD5:RC4-MD5:RC4-SHA:EXP-RC2-CBC-MD5:IDEA-CBC-SHA:EXP-DES-CBC-SHA:DES-CBC-SHA:DES-CBC3-SHA:EXP-DHE-DSS-DES-CBC-SHA:DHE-DSS-CBC-SHA:DHE-DSS-DES-CBC3-SHA:EXP-DHE-RSA-DES-CBC-SHA:DHE-RSA-DES-CBC-SHA:EXP-ADH-RC4-MD5:ADH-RC4-MD5:EXP-ADH-DES-CBC-SHA:ADH-DES-CBC-SHA:ADH-DES-CBC3-SHA:AES128-SHA:DH-DSS-AES128-SHA:DH-DSS-AES256-SHA:DH-RSA-AES128-SHA:DHE-DSS-AES128-SHA:DHE-DSS-AES256-SHA:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA:ADH-AES128-SHA:ADH-AES256-SHA:CAMELLIA128-SHA:CAMELLIA256-SHA:DH-DSS-CAMELLIA128-SHA:DH-DSS-CAMELLIA256-SHA:DH-RSA-CAMELLIA128-SHA:DH-RSA-CAMELLIA256-SHA:DHE-DSS-CAMELLIA128-SHA:DHE-DSS-CAMELLIA256-SHA:DHE-RSA-CAMELLIA128-SHA:DHE-RSA-CAMELLIA256-SHA:ADH-CAMELLIA128-SHA:ADH-CAMELLIA256-SHA:SEED-SHA:DH-DSS-SEED-SHA:DH-RSA-SEED-SHA:DHE-DSS-SEED-SHA:DHE-RSA-SEED-SHA:ADH-SEED-SHA:GOST94-GOST89-GOST89:GOST2001-GOST89-GOST89:GOST94-NULL-GOST94:GOST2001-NULL-GOST94:EXP1024-DES-CBC-SHA:EXP1024-RC4-SHA:EXP1024-DHE-DSS-DES-CBC-SHA:EXP1024-DHE-DSS-RC4-SHA:DHE-DSS-RC4-SHA:ECDH-RSA-NULL-SHA:ECDH-RSA-RC4-SHA:ECDH-RSA-DES-CBC3-SHA:ECDH-RSA-AES128-SHA:ECDH-RSA-AES256-SHA:ECDH-ECDSA-NULL-SHA:ECDH-ECDSA-RC4-SHA:ECDH-ECDSA-DES-CBC3-SHA:ECDH-ECDSA-AES128-SHA:ECDH-ECDSA-AES256-SHA:ECDHE-RSA-NULL-SHA:ECDHE-RSA-RC4-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-RSA-AES128-SHA:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-NULL-SHA:ECDHE-ECDSA-RC4-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA:AECDH-NULL-SHA:AECDH-RC4-SHA:AECDH-DES-CBC3-SHA:AECDH-AES128-SHA:AECDH-AES256-SHA";
static const char *tlsv1_2_ciphers =
"NULL-SHA256:AES128-SHA256:AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:DH-RSA-AES128-SHA256:DH-RSA-AES256-SHA256:DH-RSA-AES128-GCM-SHA256:DH-RSA-AES256-GCM-SHA384:DH-DSS-AES128-SHA256:DH-DSS-AES256-SHA256:DH-DSS-AES128-GCM-SHA256:DH-DSS-AES256-GCM-SHA384:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-DSS-AES128-SHA256:DHE-DSS-AES256-SHA256:DHE-DSS-AES128-GCM-SHA256:DHE-DSS-AES256-GCM-SHA384:ECDH-RSA-AES128-SHA256:ECDH-RSA-AES256-SHA384:ECDH-RSA-AES128-GCM-SHA256:ECDH-RSA-AES256-GCM-SHA384:ECDH-ECDSA-AES128-SHA256:ECDH-ECDSA-AES256-SHA384:ECDH-ECDSA-AES128-GCM-SHA256:ECDH-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ADH-AES128-SHA256:ADH-AES256-SHA256:ADH-AES128-GCM-SHA256:ADH-AES256-GCM-SHA384:AES128-CCM:AES256-CCM:DHE-RSA-AES128-CCM:DHE-RSA-AES256-CCM:AES128-CCM8:AES256-CCM8:DHE-RSA-AES128-CCM8:DHE-RSA-AES256-CCM8:ECDHE-ECDSA-AES128-CCM:ECDHE-ECDSA-AES256-CCM:ECDHE-ECDSA-AES128-CCM8:ECDHE-ECDSA-AES256-CCM8:ECDHE-ECDSA-CAMELLIA128-SHA256:ECDHE-ECDSA-CAMELLIA256-SHA384:ECDH-ECDSA-CAMELLIA128-SHA256:ECDH-ECDSA-CAMELLIA256-SHA384:ECDHE-RSA-CAMELLIA128-SHA256:ECDHE-RSA-CAMELLIA256-SHA384:ECDH-RSA-CAMELLIA128-SHA256:ECDH-RSA-CAMELLIA256-SHA384:PSK-NULL-SHA:DHE-PSK-NULL-SHA:RSA-PSK-NULL-SHA:PSK-RC4-SHA:PSK-3DES-EDE-CBC-SHA:PSK-AES128-CBC-SHA:PSK-AES256-CBC-SHA:DHE-PSK-RC4-SHA:DHE-PSK-3DES-EDE-CBC-SHA:DHE-PSK-AES128-CBC-SHA:DHE-PSK-AES256-CBC-SHA:RSA-PSK-RC4-SHA:RSA-PSK-3DES-EDE-CBC-SHA:RSA-PSK-AES128-CBC-SHA:RSA-PSK-AES256-CBC-SHA:PSK-AES128-GCM-SHA256:PSK-AES256-GCM-SHA384:DHE-PSK-AES128-GCM-SHA256:DHE-PSK-AES256-GCM-SHA384:RSA-PSK-AES128-GCM-SHA256:RSA-PSK-AES256-GCM-SHA384:PSK-AES128-CBC-SHA256:PSK-AES256-CBC-SHA384:PSK-NULL-SHA256:PSK-NULL-SHA384:DHE-PSK-AES128-CBC-SHA256:DHE-PSK-AES256-CBC-SHA384:DHE-PSK-NULL-SHA256:DHE-PSK-NULL-SHA384:RSA-PSK-AES128-CBC-SHA256:RSA-PSK-AES256-CBC-SHA384:RSA-PSK-NULL-SHA256:RSA-PSK-NULL-SHA384:PSK-AES128-GCM-SHA256:PSK-AES256-GCM-SHA384:ECDHE-PSK-RC4-SHA:ECDHE-PSK-3DES-EDE-CBC-SHA:ECDHE-PSK-AES128-CBC-SHA:ECDHE-PSK-AES256-CBC-SHA:ECDHE-PSK-AES128-CBC-SHA256:ECDHE-PSK-AES256-CBC-SHA384:ECDHE-PSK-NULL-SHA:ECDHE-PSK-NULL-SHA256:ECDHE-PSK-NULL-SHA384:PSK-CAMELLIA128-SHA256:PSK-CAMELLIA256-SHA384:DHE-PSK-CAMELLIA128-SHA256:DHE-PSK-CAMELLIA256-SHA384:RSA-PSK-CAMELLIA128-SHA256:RSA-PSK-CAMELLIA256-SHA384:ECDHE-PSK-CAMELLIA128-SHA256:ECDHE-PSK-CAMELLIA256-SHA384:PSK-AES128-CCM:PSK-AES256-CCM:DHE-PSK-AES128-CCM:DHE-PSK-AES256-CCM:PSK-AES128-CCM8:PSK-AES256-CCM8:DHE-PSK-AES128-CCM8:DHE-PSK-AES256-CCM8";
static const char *tlsv1_3_ciphers = "TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:TLS_AES_128_CCM_8_SHA256:TLS_AES_128_CCM_SHA256";
/* mozilla */
static const char *modern_ciphers =
"ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:TLS_AES_128_CCM_8_SHA256:TLS_AES_128_CCM_SHA256";
static const char *interm_ciphers =
"ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS";
static const char *old_ciphers =
"ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:DES-CBC3-SHA:HIGH:SEED:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!RSAPSK:!aDH:!aECDH:!EDH-DSS-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA:!SRP";
/* options global object */
static options_t op;
/* stats global object */
static stats_t stats = { 0 };
/* not thread safe, but we are not using threads */
static int client_count = 0;
/* default connection timeout in sec */
const uint32_t DEFAULT_TIMEOUT = 10;
/* used for sleep - 1 millisecond = 1,000,000 Nanoseconds */
const long NANO_SECOND_MULTIPLIER = 1000000;
/* 1 sec = 1000 millisecond */
const int SECOND_MULTPLIER = 1000;
/* try upto 3 times, before we give on session reuse support test */
const int MAX_SESSION_REUSE_RETRY = 3;
/* scan engine */
void ts_scan_start(client_t *client);
const options_t *ts_get_global_option_obj()
{
return &op;
}
stats_t *ts_get_stats_obj()
{
return &stats;
}
void global_init()
{
}
/* TODO
3. tls13 only scans
4. convert tls1.3 cipher name to openssl compliant name
5. implement ST_GNUTLS_CERT
6. fix port bug
7. GnuTLS cert verification
8. Review and fix client object variable init (create/init functions)
*/
/* returns current scan type/state */
scan_type_t ts_scan_type(const client_t *cli);
size_t alpn_wireformat(const char* alpn_str, unsigned char alpn[])
{
char *c = NULL;
char *c2 = strdup(alpn_str);
char *tptr = c2;
int index = 0;
size_t len = 0;
while ((c = strtok_r(tptr, ", ", &tptr))) {
len = strlen(c);
alpn[index++] = (unsigned char)len;
memcpy(&alpn[index], c, len);
index = index + len;
}
alpn[index+1] = 0;
free(c2);
return index;
}
// https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_ciphersuites.html
// seperate given ciphers into to TLS1.3 and pre-TLS1.3 cipher group
void get_ciphersuites_and_cipher_list(const char *ciphers,
char o_ciphersuites[], char o_cipher_list[])
{
char *c = NULL;
char *c2 = strdup(ciphers);
char *tptr = c2;
size_t n = 0, m = 0;
o_ciphersuites[0] = o_cipher_list[0] = 0;
while ((c = strtok_r(tptr, ":", &tptr))) {
if(strstr(tlsv1_3_ciphers, c) != NULL) {
if (n == 0) {
strcpy(o_ciphersuites, c);
} else {
strcat(o_ciphersuites, ":");
strcat(o_ciphersuites, c);
}
n++;
} else {
if (m == 0) {
strcpy(o_cipher_list, c);
} else {
strcat(o_cipher_list, ":");
strcat(o_cipher_list, c);
}
m++;
}
}
free(c2);
return;
}
// https://www.openssl.org/docs/man1.1.0/ssl/SSL_CTX_set_info_callback.html
void apps_ssl_info_callback(SSL *s, int where, int ret)
{
const char *str;
int w;
w = where & ~SSL_ST_MASK;
if (w & SSL_ST_CONNECT) str = "SSL_connect";
else if (w & SSL_ST_ACCEPT) str = "SSL_accept";
else str = "undefined";
if (where & SSL_CB_LOOP) {
printf("%s:%s\n", str, SSL_state_string_long(s));
}
else if (where & SSL_CB_ALERT) {
str = (where & SSL_CB_READ) ? "read" : "write";
printf("SSL3 alert %s:%s:%s\n",
str,
SSL_alert_type_string_long(ret),
SSL_alert_desc_string_long(ret));
}
else if (where & SSL_CB_EXIT) {
if (ret == 0)
printf("%s:failed in %s\n",
str, SSL_state_string_long(s));
else if (ret < 0) {
printf("%s:error in %s\n",
str, SSL_state_string_long(s));
}
}
}
/* create an SSL object, and initiaze it */
SSL *ts_ssl_create(SSL_CTX *ssl_ctx, client_t *cli)
{
SSL *ssl = SSL_new(ssl_ctx);
if (!ssl) {
fprintf(stderr, "Could not create SSL/TLS session object: %s",
ERR_error_string(ERR_get_error(), NULL));
}
const char *cipher = cli->op->ciphers;
bool ssl2 = false;
if (cli->cipher_index >= 0) {
cipher = cli->op->cipher_enum_list[cli->cipher_index];
if (strstr(sslv2_ciphers, cipher)) {
ssl2 = true;
}
}
scan_type_t st = ts_scan_type(cli);
if (ST_SESSION_REUSE == st) {
cipher = old_ciphers; // default_ciphers; // default cipher list is too long
if (!SSL_set_ssl_method(ssl, SSLv23_client_method())) {
fprintf(stderr, "%s %d %s\n", "SSL_set_ssl_method failed, skipping..",
cli->tls_ver_index, cipher);
}
if (cli->tls_cert->session != NULL) {
SSL_set_session(ssl, cli->tls_cert->session);
}
} else if (ST_TLS_VERSION == st) {
// TODO set cipher to ciphers based on tls version
cipher = default_ciphers;
if (cli->tls_ver_index == 0) {
cipher = sslv2_ciphers;
}
SSL_set_options(ssl, ts_tls_get_options(cli->tls_ver_index));
if (!SSL_set_ssl_method(ssl, ts_tls_get_method(cli->tls_ver_index))) {
fprintf(stderr, "%s %d %s\n", "SSL_set_ssl_method failed, skipping..",
cli->tls_ver_index, cipher);
}
#if OPENSSL_VERSION_NUMBER < 0x10100000L
} else if (cli->op->ssl2) {
if (!SSL_set_ssl_method(ssl, SSLv2_client_method())) {
fprintf(stderr, "%s %d %s\n",
"SSL_set_ssl_method (SSL2) failed, skipping..",
cli->tls_ver_index, cipher);
}
#endif
} else {
if (!SSL_set_ssl_method(ssl, (ssl2) ? SSLv2_client_method() :
SSLv23_client_method())) {
fprintf(stderr, "%s %d %s\n", "SSL_set_ssl_method failed, skipping..",
cli->tls_ver_index, cipher);
}
}
if (ST_CERT == st) {
if (cli->op->session_in_fp) {
cli->tls_cert->session = PEM_read_SSL_SESSION(cli->op->session_in_fp,
NULL, NULL, NULL);
SSL_set_session(ssl, cli->tls_cert->session);
PEM_write_SSL_SESSION(stderr, cli->tls_cert->session);
}
// check only for the first time
SSL_set_tlsext_status_type(ssl, TLSEXT_STATUSTYPE_ocsp);
}
// a hack, to void additional local variables
get_ciphersuites_and_cipher_list(cipher, op.ciphersuites, op.cipher_list);
// https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_ciphersuites.html
// if no ciphers, then set NULL
if (!SSL_set_cipher_list(ssl,
(strlen(op.cipher_list) == 0) ? "NO-CIPHER": op.cipher_list)) {
fprintf(stderr, "%s %d %s\n", "SSL_set_cipher_list failed, skipping..",
cli->cipher_index, cipher);
SSL_free(ssl);
return NULL;
}
#if OPENSSL_VERSION_NUMBER > 0x10101010L
if (strlen(op.ciphersuites) > 0) {
if (!SSL_set_ciphersuites(ssl, op.ciphersuites)) {
fprintf(stderr, "%s %d %s\n", "SSL_set_ciphersuites failed, skipping..",
cli->cipher_index, cipher);
SSL_free(ssl);
return NULL;
}
}
#endif
if (!cli->op->ssl2) {
// Set hostname for SNI extension
if (cli->op->sni[0] != 0) {
SSL_set_tlsext_host_name(ssl, cli->op->sni);
} else if (cli->host[0] != 0) {
SSL_set_tlsext_host_name(ssl, cli->host);
}
// Set ALPN protocol ids
if (cli->op->alpn_size != 0) {
SSL_set_alpn_protos(ssl, cli->op->alpn, cli->op->alpn_size);
}
}
return ssl;
}
SSL_CTX *ts_ssl_ctx_create(const char *ciphers, const char *cacert, bool ssl2)
{
// Initialize SSL
SSL_library_init();
SSL_load_error_strings();
SSL_CTX *ssl_ctx = NULL;
#if OPENSSL_VERSION_NUMBER < 0x10100000L
if (ssl2) {
ssl_ctx = SSL_CTX_new(SSLv2_client_method());
} else {
ssl_ctx = SSL_CTX_new(SSLv23_client_method());
}
#else
ssl_ctx = SSL_CTX_new(SSLv23_client_method());
#endif
//SSL_CTX_set_info_callback(ssl_ctx, apps_ssl_info_callback);
if (!SSL_CTX_set_cipher_list(ssl_ctx,
(strlen(op.cipher_list) == 0) ? "NO-CIPHER": op.cipher_list)) {
fprintf(stderr, "%s\n", "SSL_CTX_set_cipher_list failed, exiting..");
exit(EXIT_FAILURE);
}
#if OPENSSL_VERSION_NUMBER > 0x10101010L
if (strlen(op.ciphersuites) > 0) {
if (!SSL_CTX_set_ciphersuites(ssl_ctx, op.ciphersuites)) {
fprintf(stderr, "%s\n", "SSL_CTX_set_ciphersuites failed, exiting..");
exit(EXIT_FAILURE);
}
}
#endif
/*
SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER, dubug_ssl_verify_callback);
SSL_CTX_set_info_callback(ssl_ctx, dubug_ssl_info_callback);
SSL_CTX_set_msg_callback(ssl_ctx, dubug_ssl_msg_callback);
*/
long res = SSL_CTX_load_verify_locations(ssl_ctx, cacert, NULL);
if (1 != res) {
fprintf(stderr, "%s\n", "Error: Root CA bundle with correct path required \
(--cacert flag); exiting..");
exit(EXIT_FAILURE);
}
SSL_CTX_set_verify_depth(ssl_ctx, 5);
SSL_COMP_add_compression_method(0, COMP_zlib());
#if OPENSSL_VERSION_NUMBER < 0x10100000L
SSL_COMP_add_compression_method(1, COMP_rle());
#endif
return ssl_ctx;
}
void ts_ssl_destroy(SSL_CTX * ssl_ctx)
{
SSL_CTX_free(ssl_ctx);
ERR_free_strings();
ERR_remove_thread_state(NULL);
EVP_cleanup();
CRYPTO_cleanup_all_ex_data();
//sk_SSL_COMP_free(SSL_COMP_get_compression_methods());
SSL_COMP_free_compression_methods();
}
/* Initializes client object */
client_t *ts_client_create(struct event_base *evbase,
struct evdns_base *dnsbase,
SSL_CTX *ssl_ctx,
const options_t *options,
int id)
{
client_count++;
client_t *cli = (client_t*)malloc(sizeof(client_t));
assert(cli != NULL);
// memset(cli, 0, sizeof(client_t));
cli->id = id;
cli->session_reuse_supported = false;
cli->reuse_test_count = -1;
cli->cipher_index = -1;
cli->cipher1_3_index = -1;
cli->tls_ver_index = -1;
cli->event_status = TS_SUCCESS;
cli->tls_cert = NULL;
cli->bev = NULL;
cli->temp_bev = NULL;
// life time is as same as client object.
cli->dnsbase = dnsbase;
cli->evbase = evbase;
cli->port = options->port;
cli->ssl_ctx = ssl_ctx;
cli->timeout = options->timeout;
cli->op = options;
cli->adapter_index = op.protocol_adapter_index;
cli->scan_engine = SE_OPENSSL;
// call adapter create
ts_adapter_create(cli);
return cli;
}
/*
Called for the first time scanning a remote server. Subsequent
calls for cipher/tls-version enum scans do not call this.
*/
bool ts_client_init(client_t *cli)
{
char *input =NULL;
cli->host[0] = cli->ip[0] = 0;
if (cli->op->ip_input) {
input = cli->ip;
} else {
input = cli->host;
}
char line[DEFAULT_HOSTLEN+5];
if (ts_get_line_input(&in_handle, line, DEFAULT_HOSTLEN) == -1) {
return false;
}
ts_parse_connect_target(line, input, OPT_STRLEN, &cli->port);
ts_tls_cert_reset(cli->op->cert_obj_pool[cli->id]);
cli->tls_cert = cli->op->cert_obj_pool[cli->id];
cli->session_reuse_supported = false;
cli->reuse_test_count = -1;
cli->cipher_index = -1;
cli->cipher1_3_index = -1;
cli->tls_ver_index = -1;
cli->event_status = TS_SUCCESS;
cli->state = ST_CERT;
cli->scan_engine = SE_OPENSSL;
gettimeofday(&cli->tls_cert->start_time, NULL);
ts_adapter_init(cli);
return true;
}
void ts_client_reset(client_t * cli)
{
if (cli->bev) {
bufferevent_disable(cli->bev, EV_READ | EV_WRITE);
SSL *ssl = bufferevent_openssl_get_ssl(cli->bev);
if (ssl) {
SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
SSL_shutdown(ssl);
}
bufferevent_free(cli->bev);
cli->bev = NULL;
cli->temp_bev = NULL;
cli->event_status = TS_SUCCESS;
}
ts_adapter_reset(cli);
}
void ts_client_destroy(client_t * cli)
{
if (cli) {
struct event_base *base = cli->evbase;
ts_adapter_destroy(cli);
if (--client_count == 0) {
event_base_loopexit(base, NULL);
}
free(cli);
}
}
void print_tls_cert(client_t *cli)
{
struct timeval t;
gettimeofday(&t, NULL);
cli->tls_cert->elapsed_time_ms =
(t.tv_sec - cli->tls_cert->start_time.tv_sec) * 1000 +
(t.tv_usec - cli->tls_cert->start_time.tv_usec)/1000;
ts_tls_print_json(cli->tls_cert, cli->op->certlog_fp, cli->op->pretty);
}
/* returns the current scan type/state */
scan_type_t ts_scan_type(const client_t *cli)
{
return cli->state;
}
void ts_scan_parallel_host_scan(client_t *cli);
/* Use to determine the next test. The test could be tls version,
enum, cipher enum, session-reuse check or move over to next server.
This also updates the current state to next state.
*/
scan_type_t ts_scan_next(client_t *cli)
{
// default scan engine. overridden for TLS 1.3+ scans
cli->scan_engine = SE_OPENSSL;
if ((cli->op->session_reuse_test) && (!cli->session_reuse_supported) &&
(cli->reuse_test_count+1 < MAX_SESSION_REUSE_RETRY)) {
cli->reuse_test_count++;
cli->state = ST_SESSION_REUSE;
return ST_SESSION_REUSE;
}
// parallelize cipher and tls-version enumerations
if (((cli->op->tls_vers_enum) || (cli->op->cipher_enum)) &&
(cli->op->host[0] != 0) && (!op.no_parallel_enum)) {
cli->state = ST_HOST_PARALLEL;
return ST_HOST_PARALLEL;
}
// tls-version enum scans
if (cli->op->tls_vers_enum) {
if (cli->tls_ver_index+1 < MAX_OPENSSL_TLS_VERSION) {
cli->tls_ver_index++;
nanosleep(&cli->op->ts_sleep, NULL);
cli->scan_engine = SE_OPENSSL;
cli->state = ST_TLS_VERSION;
return ST_TLS_VERSION;
}
// GnuTLS 1.3 scans
if (cli->tls_ver_index+1 < MAX_TLS_VERSION) {
cli->tls_ver_index++;
nanosleep(&cli->op->ts_sleep, NULL);
if ((!cli->op->ssl2) && (!cli->op->ssl3) && (!cli->op->tls1)) {
cli->scan_engine = SE_GNUTLS;
cli->state = ST_GNUTLS_VERSION;
return ST_GNUTLS_VERSION;
}
}
}
// cipher enum scans
if (cli->op->cipher_enum) {
if (cli->cipher_index+1 < cli->op->cipher_enum_count) {
cli->cipher_index++;
// scan CHACHA ciphers using gnults
if (strstr(cli->op->cipher_enum_list[cli->cipher_index], "CHACHA") != NULL) {
nanosleep(&cli->op->ts_sleep, NULL);
cli->scan_engine = SE_GNUTLS;
cli->state = ST_GNUTLS_1_2CHACHA_CIPHER;
return ST_GNUTLS_1_2CHACHA_CIPHER;
}
// continue with same host/ip, but different cipher
nanosleep(&cli->op->ts_sleep, NULL);
cli->scan_engine = SE_OPENSSL;
cli->state = ST_CIPHER;
return ST_CIPHER;
}
if (cli->cipher1_3_index+1 < cli->op->cipher1_3_enum_count) {
cli->cipher1_3_index++;
nanosleep(&cli->op->ts_sleep, NULL);
cli->scan_engine = SE_GNUTLS;
cli->state = ST_GNUTLS_CIPHER;
return ST_GNUTLS_CIPHER;
}
}
cli->state = ST_CERT_PRINT;
return ST_CERT_PRINT;
}
void ts_scan_connect(client_t *cli, bool ip_input);
/* An endpoint scan is complete (include session-reuse, tls-version enum
cipher enum).
*/
void ts_scan_end(client_t * cli, scan_type_t st)
{
switch (st) {
case ST_CERT:
ts_tls_cert_BIO_free(cli->tls_cert);
break;
case ST_CERT_PRINT:
print_tls_cert(cli);
ts_tls_cert_BIO_free(cli->tls_cert);
break;
default:
break;
}
if ((!cli->op->no_parallel_enum) && ((op.outfile[0] != 0) || (op.stats_outfile[0] != 0))) {
uint64_t et = ts_elapsed_time(stats.start_time);
++stats.hcount;
if (op.outfile[0] != 0) {
fprintf(stdout, "\relapsed-time: %"PRIu64" secs | status: %d/%d | tls-handshake: %d | target: %s ", et/1000000, stats.hcount, stats.connect_count, stats.gross_tls_handshake, cli->host);
fflush(stdout);
}
if (op.stats_outfile[0] != 0) {
fprintf(cli->op->statsfile_fp, "%"PRIu64" %d %d %d %d %d %d %d %d %d %d %s\n", et/1000000, stats.hcount, stats.connect_count, stats.network_err_count, stats.dns_errcount, stats.remote_close_count, stats.error_count, stats.connect_err_count, stats.timeout_count, stats.tls_handshake, stats.gross_tls_handshake, cli->host);
}
}
ts_scan_start(cli);
return;
}
/* connection close */
void ts_scan_disconnect(client_t * cli)
{
if (cli) {
// only for single scans + with no_parallel_scans
if ((cli->op->no_parallel_enum) && ((op.outfile[0] != 0) || (op.stats_outfile[0] != 0))) {
uint64_t et = ts_elapsed_time(stats.start_time);
FILE *fp = stdout;
char cr = '\r';
if (op.stats_outfile[0] != 0) {
fp = cli->op->statsfile_fp;
cr = '\n';
}
if ((cli->tls_ver_index < 0) && (cli->cipher_index < 0)) {
fprintf(fp, "%celapsed-time: %"PRIu64".%"PRIu64" secs | tls-handshake: %d | scan-type: cert ", cr, et/1000000, et%1000000, stats.gross_tls_handshake);
} else if (cli->state == ST_TLS_VERSION || cli->state == ST_GNUTLS_VERSION) {
fprintf(fp, "%celapsed-time: %"PRIu64".%"PRIu64" secs | tls-handshake: %d | scan-type: tls-version-enum %s ", cr, et/1000000, et%1000000, stats.gross_tls_handshake, get_ssl_version_str(cli->tls_ver_index));
} else if (cli->state == ST_GNUTLS_CIPHER) {
fprintf(fp, "%celapsed-time: %"PRIu64".%"PRIu64" secs | tls-handshake: %d | scan-type: cipher %d:%d %s ", cr, et/1000000, et%1000000, stats.gross_tls_handshake, cli->cipher1_3_index+1 + cli->cipher_index+1, cli->op->cipher1_3_enum_count + cli->op->cipher_enum_count, cli->op->cipher1_3_enum_list[cli->cipher1_3_index]);
} else if (cli->state == ST_CIPHER) {
fprintf(fp, "%celapsed-time: %"PRIu64".%"PRIu64" secs | tls-handshake: %d | scan-type: cipher %d:%d %s ", cr, et/1000000, et%1000000, stats.gross_tls_handshake, cli->cipher_index+1, cli->op->cipher_enum_count + cli->op->cipher1_3_enum_count, cli->op->cipher_enum_list[cli->cipher_index]);
}
if (cr == '\r') {
fflush(stdout);
}
}
ts_client_reset(cli);
scan_type_t st = ts_scan_next(cli);
switch (st) {
case ST_SESSION_REUSE:
ts_scan_connect(cli, true);
break;
case ST_HOST_PARALLEL:
ts_scan_parallel_host_scan(cli);
//ts_scan_start(cli);
break;
case ST_TLS_VERSION:
ts_scan_connect(cli, true);
break;
case ST_CIPHER:
ts_scan_connect(cli, true);
break;
case ST_GNUTLS_VERSION:
case ST_GNUTLS_CIPHER:
case ST_GNUTLS_1_2CHACHA_CIPHER:
ts_scan_connect(cli, true);
break;
case ST_CERT:
case ST_CERT_PRINT:
default:
ts_scan_end(cli, st);
break;
}
}
}
void ts_scan_error(client_t * cli)
{
scan_type_t st = ST_CERT;
if (cli) {
// error, move to next remote server
if ((cli->cipher_index == -1) && (cli->tls_ver_index == -1) &&
(cli->reuse_test_count == -1)) {
stats.connect_err_count++;
} else if (cli->event_status == TS_HSHAKE_ERR) {
//continue with next cipher/tls-version scan
ts_scan_disconnect(cli);
return;
} else {
st = ST_CERT_PRINT;
}
ts_client_reset(cli);
ts_scan_end(cli, st);
return;
}
// move on..
ts_scan_start(cli);
return;
}
static int set_linger(int fd, int onoff, int linger)
{
struct linger lgr;
lgr.l_linger = linger;
lgr.l_onoff = onoff;
int res = setsockopt(fd, SOL_SOCKET, SO_LINGER, &lgr, sizeof(lgr));
assert(res == 0);
return res;
}
void tls_scan_connect_error_handler(struct bufferevent *bev, short events,
client_t *cli)
{
cli->event_status = TS_HSHAKE_ERR;
if (events & BEV_EVENT_ERROR) {
int err;
err = bufferevent_socket_get_dns_error(bev);
if (err) {
fprintf(stderr, "host: %s; ip: %s; error: DNS; errormsg: %s\n",
cli->host, cli->ip, evutil_gai_strerror(err));
stats.dns_errcount++;
return;
}
}
if (events & BEV_EVENT_EOF) {
stats.remote_close_count++;
fprintf(stderr, "host: %s; ip: %s; error: Network; errormsg: \
Disconnected from the remote host\n", cli->host, cli->ip);
} else if (events & BEV_EVENT_TIMEOUT) {
cli->event_status = TS_TIMEOUT;
stats.timeout_count++;
fprintf(stderr, "host: %s; ip: %s; port: %d; error: Timeout\n", cli->host,
cli->ip, cli->port);
} else if (events & BEV_EVENT_READING) {
stats.network_err_count++;
scan_type_t t = ts_scan_type(cli);
// it is expected to fail version and cipher enumeration requests
// so skip printing msgs to error console for those requests
if ((ST_TLS_VERSION != t) && (ST_CIPHER != t)) {
fprintf(stderr, "host: %s; ip: %s; error: Network; errormsg: \
Error encountered while reading\n", cli->host, cli->ip);
}
} else if (events & BEV_EVENT_WRITING) {
stats.network_err_count++;
fprintf(stderr, "host: %s; ip: %s; error: Network; errormsg: \
Error encountered while writing\n", cli->host, cli->ip);
} else {
stats.error_count++;
fprintf(stderr, "host: %s; ip: %s; error: Unknown; errormsg: %s\n",
cli->host, cli->ip, evutil_socket_error_to_string(EVUTIL_SOCKET_ERROR()));
}
}
/*
* ts_scan_tls_connect callback is called after the successful completion
* of TLS handshake
*/
void ts_scan_tls_connect_cb(struct bufferevent *bev, short events, void *ptr)
{
client_t *cli = (client_t *) ptr;
assert(cli != NULL);
if (events & BEV_EVENT_CONNECTED) {
stats.gross_tls_handshake++;
switch (ts_scan_type(cli)) {
case ST_CERT:
stats.tls_handshake++;
strcpy(cli->tls_cert->host, cli->host);
cli->tls_cert->port = cli->port;
int fd;
if (cli->ip[0] == 0) {
fd = bufferevent_getfd(bev);
ts_get_ip(fd, cli->ip, sizeof(cli->ip));
}
strcpy(cli->tls_cert->ip, cli->ip);
ts_tls_cert_parse(bufferevent_openssl_get_ssl(bev), cli->tls_cert,
cli->op->certlog_fp, cli->op->pretty);
if (cli->op->session_in_fp) {
if (SSL_session_reused(bufferevent_openssl_get_ssl(bev))) {
cli->session_reuse_supported = true;
cli->tls_cert->session_reuse_supported = true;
} else {
//fprintf(stderr, "NEW SESSION\n");
}
}
break;
case ST_SESSION_REUSE:
// Was the stored session reused?
if (SSL_session_reused(bufferevent_openssl_get_ssl(bev))) {
cli->session_reuse_supported = true;
cli->tls_cert->session_reuse_supported = true;
} else {
//printf("NEW SESSION\n");
}
break;
case ST_TLS_VERSION:
cli->tls_cert->tls_ver_support[cli->tls_ver_index] = true;
break;
case ST_CIPHER:
cli->tls_cert->cipher_suite_support[cli->cipher_index] = true;
break;
default:
assert(0);
break;
}
ts_scan_disconnect(cli);
} else {
tls_scan_connect_error_handler(bev, events, cli);
ts_scan_error(cli);
}
return;
}
void ts_scan_do_tls1_3_handshake_cb(evutil_socket_t fd, short event, void *ptr)
{
client_t *cli = (client_t *) ptr;
assert(cli != NULL);
if (event == EV_READ) {
ts_status_t status = gnutls13_handshake(cli, fd);
if (status == TS_EAGAIN_ERR) {
const struct timeval timeout = { cli->timeout, 0 };
assert(cli->handshake1_3_ev != NULL);
event_add(cli->handshake1_3_ev, &timeout);
return;
}
if (status == TS_SUCCESS) {
stats.gross_tls_handshake++;
}
if (status == TS_HSHAKE_ERR) {
stats.network_err_count++;
}
}
if (event == EV_TIMEOUT) {
stats.timeout_count++;
}
if (cli->handshake1_3_ev) {
event_free(cli->handshake1_3_ev);
}
gnutls13_session_deinit(cli);
ts_scan_disconnect(cli);
}
/* TLS handshake on existing TCP session, used by protocol adapters */
void ts_scan_do_tls1_3_handshake(client_t *cli)
{
int fd;
fd = bufferevent_getfd(cli->temp_bev);
gnutls13_session_init(cli, fd);
ts_status_t status = gnutls13_handshake(cli, fd);
if (status == TS_EAGAIN_ERR) {
const struct timeval timeout = { cli->timeout, 0 };
cli->handshake1_3_ev = event_new(cli->evbase, fd, EV_TIMEOUT|EV_READ,
ts_scan_do_tls1_3_handshake_cb, cli);
assert(cli->handshake1_3_ev != NULL);
event_add(cli->handshake1_3_ev, &timeout);
return;
}
if (status == TS_SUCCESS) {
stats.gross_tls_handshake++;
}
if (status == TS_HSHAKE_ERR) {
stats.network_err_count++;
}
gnutls13_session_deinit(cli);
ts_scan_disconnect(cli);
}
/* TLS handshake on existing TCP session, used by protocol adapters */
void ts_scan_do_tls_handshake(client_t *cli)
{
struct bufferevent *bev_ssl = NULL;
SSL *ssl = NULL;
ssl = ts_ssl_create(cli->ssl_ctx, cli);
if (!ssl) {
cli->event_status = TS_SSL_CREAT_ERR;
ts_scan_error(cli);
return;
}
bev_ssl = bufferevent_openssl_filter_new(cli->evbase,
cli->temp_bev, ssl,
BUFFEREVENT_SSL_CONNECTING,
BEV_OPT_CLOSE_ON_FREE); // |
//BEV_OPT_DEFER_CALLBACKS);
if (!bev_ssl) {
fprintf(stderr, "host: %s; ip: %s; error: Bufferevent_openssl_new\n",
cli->host, cli->ip);
cli->event_status = TS_CONN_ERR;
ts_scan_error(cli);
} else {
cli->bev = cli->temp_bev = bev_ssl;
bufferevent_setcb(cli->bev, NULL, NULL, ts_scan_tls_connect_cb, cli);
}
}
// called by adapter functions (proto-adapters.c)
void ts_scan_tcp_write(client_t *cli,
const unsigned char *data, size_t data_len)
{
if (cli->temp_bev) {
bufferevent_write(cli->temp_bev, data, data_len);
} else {
bufferevent_write(cli->bev, data, data_len);
}
}
void ts_scan_tcp_read_cb(struct bufferevent *bev, void *ptr)
{
client_t *cli = (client_t *) ptr;
assert(cli != NULL);
struct evbuffer *input = bufferevent_get_input(bev);
size_t nread = evbuffer_get_length(input);
unsigned char *read_buf = malloc(nread+1);
memcpy(read_buf, evbuffer_pullup(input, -1), nread);
cli->temp_bev = bev;
evbuffer_drain(input, nread);
ts_adapter_read(cli, read_buf, nread);
free (read_buf);
return;
}
void ts_scan_tcp_write_cb(struct bufferevent *bev, void *ptr)
{
client_t *cli = (client_t *) ptr;
assert(cli != NULL);
ts_adapter_write(cli);
return;
}
void ts_scan_tcp_connect_cb(struct bufferevent *bev, short events, void *ptr)
{
client_t *cli = (client_t *) ptr;
assert(cli != NULL);