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sslscan.c
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/***************************************************************************
* sslscan - A SSL cipher scanning tool *
* Copyright 2007-2009 by Ian Ventura-Whiting (Fizz) *
* fizz@titania.co.uk *
* Copyright 2010 by Michael Boman (michael@michaelboman.org) *
* Copyleft 2010 by Jacob Appelbaum <jacob@appelbaum.net> *
* Copyleft 2013 by rbsec <robin@rbsec.net> *
* Copyleft 2014 by Julian Kornberger <jk+github@digineo.de> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
* *
* In addition, as a special exception, the copyright holders give *
* permission to link the code of portions of this program with the *
* OpenSSL library under certain conditions as described in each *
* individual source file, and distribute linked combinations *
* including the two. *
* You must obey the GNU General Public License in all respects *
* for all of the code used other than OpenSSL. If you modify *
* file(s) with this exception, you may extend this exception to your *
* version of the file(s), but you are not obligated to do so. If you *
* do not wish to do so, delete this exception statement from your *
* version. If you delete this exception statement from all source *
* files in the program, then also delete it here. *
***************************************************************************/
#define _GNU_SOURCE
// Includes...
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#define VC_EXTRALEAN
#define _WIN32_WINNT 0x0501
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdint.h>
#include <winbase.h>
#ifdef _MSC_VER
// For access().
#include <io.h>
// Flag for access() call.
#define R_OK 4
// access() happens to be deprecated, so use the secure version instead.
#define access _access_s
// There is no snprintf(), but _snprintf() instead.
#define snprintf _snprintf
// Calling close() on a socket descriptor instead of closesocket() causes
// a crash!
#define close closesocket
// Visual Studio doesn't have ssize_t...
typedef int ssize_t;
#else
void *memmem(const void *haystack_start, size_t haystack_len, const void *needle, size_t needle_len);
/* Taken from https://sourceforge.net/p/mingw/bugs/_discuss/thread/ec0291f1/93ae/attachment/patchset-wrapped.diff:*/
#define timersub(a, b, result) \
do { \
(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
if ((result)->tv_usec < 0) { \
--(result)->tv_sec; \
(result)->tv_usec += 1000000L; \
} \
} while (0)
#ifdef BUILD_32BIT
#include "win32bit-compat.h"
#endif
#endif
#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
#endif
#else
#include <netdb.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <fcntl.h>
#endif
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <openssl/ec.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/pkcs12.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/ocsp.h>
#ifdef __linux__
#include <arpa/inet.h>
#endif
#ifndef OPENSSL_NO_COMP
#include <openssl/comp.h>
#endif
// If we're not compiling with Visual Studio, include unistd.h. VS
// doesn't have this header.
#ifndef _MSC_VER
#include <unistd.h>
#endif
#if defined(__FreeBSD__) || defined(__OpenBSD__)
#include <netinet/in.h>
#endif
/* Format specifier for printing a size_t. */
#ifdef _WIN32
#define SIZE_T_FMT PRIu64
#else
#define SIZE_T_FMT "zu"
#endif
#include "sslscan.h"
#if OPENSSL_VERSION_NUMBER < 0x1010100fL
#error "OpenSSL v1.1.1 or later is required!"
#endif
/* Borrowed from tortls.c to dance with OpenSSL on many platforms, with
* many versions and releases of OpenSSL. */
/** Does the run-time openssl version look like we need
* SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION? */
static int use_unsafe_renegotiation_op = 0;
/** Does the run-time openssl version look like we need
* SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION? */
static int use_unsafe_renegotiation_flag = 0;
/** Does output xml to stdout? */
static int xml_to_stdout = 0;
#if OPENSSL_VERSION_NUMBER < 0x1000100L
unsigned long SSL_CIPHER_get_id(const SSL_CIPHER* cipher) { return cipher->id; }
#endif
const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
const SSL_METHOD *TLSv1_3_client_method(void)
{
return TLS_client_method();
}
const SSL_METHOD *TLSv1_3_method(void)
{
return TLS_method();
}
/* Callback set through SSL_set_security_callback() and SSL_CTX_set_security_callback(). Allows all weak algorithms. */
static int security_callback_allow_all(const SSL *s, const SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex) {
return 1;
}
/* Creates an SSL_CTX using SSL_CTX_new(), sets the security level to 0, and sets the permissive security callback on it. Free with FREE_CTX(). */
SSL_CTX *new_CTX(const SSL_METHOD *method) {
SSL_CTX *ret = SSL_CTX_new(method);
SSL_CTX_set_security_level(ret, 0);
SSL_CTX_set_security_callback(ret, security_callback_allow_all);
return ret;
}
/* Creates an SSL object using SSL_new(), sets the security level to 0, and sets the permissive security callback on it. Free with FREE_SSL(). */
SSL *new_SSL(SSL_CTX *ctx) {
SSL *ret = SSL_new(ctx);
SSL_set_security_level(ret, 0);
SSL_set_security_callback(ret, security_callback_allow_all);
return ret;
}
// Adds Ciphers to the Cipher List structure
int populateCipherList(struct sslCheckOptions *options, const SSL_METHOD *sslMethod)
{
int returnCode = true;
struct sslCipher *sslCipherPointer;
int tempInt;
int loop;
// STACK_OF is a sign that you should be using C++ :)
STACK_OF(SSL_CIPHER) *cipherList;
SSL *ssl = NULL;
options->ctx = new_CTX(sslMethod);
if (options->ctx == NULL) {
printf_error("Could not create CTX object.");
return false;
}
SSL_CTX_set_cipher_list(options->ctx, CIPHERSUITE_LIST_ALL);
ssl = new_SSL(options->ctx);
if (ssl == NULL) {
printf_error("Could not create SSL object.");
FREE_CTX(options->ctx);
return false;
}
cipherList = SSL_get_ciphers(ssl);
// Create Cipher Struct Entries...
for (loop = 0; loop < sk_SSL_CIPHER_num(cipherList); loop++)
{
if (options->ciphers == 0)
{
options->ciphers = malloc(sizeof(struct sslCipher));
sslCipherPointer = options->ciphers;
}
else
{
sslCipherPointer = options->ciphers;
while (sslCipherPointer->next != 0)
sslCipherPointer = sslCipherPointer->next;
sslCipherPointer->next = malloc(sizeof(struct sslCipher));
sslCipherPointer = sslCipherPointer->next;
}
// Init
memset(sslCipherPointer, 0, sizeof(struct sslCipher));
// Add cipher information...
sslCipherPointer->sslMethod = sslMethod;
sslCipherPointer->name = SSL_CIPHER_get_name(sk_SSL_CIPHER_value(cipherList, loop));
sslCipherPointer->version = SSL_CIPHER_get_version(sk_SSL_CIPHER_value(cipherList, loop));
SSL_CIPHER_description(sk_SSL_CIPHER_value(cipherList, loop), sslCipherPointer->description, sizeof(sslCipherPointer->description) - 1);
sslCipherPointer->bits = SSL_CIPHER_get_bits(sk_SSL_CIPHER_value(cipherList, loop), &tempInt);
}
FREE_SSL(ssl);
FREE_CTX(options->ctx);
return returnCode;
}
// File Exists
int fileExists(char *fileName)
{
return access(fileName, R_OK) == 0;
}
// Read a line from the input...
void readLine(FILE *input, char *lineFromFile, int maxSize)
{
// Variables...
int stripPointer;
// Read line from file...
fgets(lineFromFile, maxSize, input);
// Clear the end-of-line stuff...
stripPointer = strlen(lineFromFile) -1;
while (stripPointer >= 0 && ((lineFromFile[stripPointer] == '\r') || (lineFromFile[stripPointer] == '\n') || (lineFromFile[stripPointer] == ' ')))
{
lineFromFile[stripPointer] = 0;
stripPointer--;
}
}
int readOrLogAndClose(int fd, void* buffer, size_t len, const struct sslCheckOptions *options)
{
ssize_t n;
if (len < 2)
return 1;
n = recv(fd, buffer, len - 1, 0);
if (n < 0 && errno != 11) {
printf_error("Error reading from %s:%d: %s", options->host, options->port, strerror(errno));
close(fd);
return 0;
} else if (n == 0) {
printf_error("Unexpected EOF reading from %s:%d", options->host, options->port);
close(fd);
return 0;
} else {
((unsigned char *)buffer)[n] = 0;
}
return 1;
}
// Write a null-terminated string to a socket
ssize_t sendString(int sockfd, const char str[])
{
return send(sockfd, str, strlen(str), 0);
}
char *sock_strerror(int err)
{
#ifdef _WIN32
static char msg[255];
msg[0] = '\0';
if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), msg, sizeof(msg), NULL) == 0 || msg[0] == '\0')
{
sprintf(msg, "Error code %d", err);
}
return msg;
#else
return strerror(err);
#endif
}
int tcpConnectSocket(int socket, struct sslCheckOptions *options, char *error, int errlen)
{
int status = -1, flags, errn = 0, len;
fd_set rset, wset, eset;
struct timeval tval;
#ifdef _WIN32
#define INPROGRESS WSAEWOULDBLOCK
#define sock_errno WSAGetLastError()
flags = 1;
if ((status = ioctlsocket(socket, FIONBIO, (u_long *)&flags)) != 0)
{
snprintf(error, errlen, "ioctlsocket: %s", sock_strerror(sock_errno));
return status;
}
#else
#define INPROGRESS EINPROGRESS
#define sock_errno errno
if ((flags = fcntl(socket, F_GETFL, 0)) < 0)
{
snprintf(error, errlen, "fcntl getfl: %s", sock_strerror(sock_errno));
return status;
}
if (fcntl(socket, F_SETFL, flags | O_NONBLOCK) < 0)
{
snprintf(error, errlen, "fcntl setfl: %s", sock_strerror(sock_errno));
return status;
}
#endif
// Connect
if (options->h_addrtype == AF_INET)
{
status = connect(socket, (struct sockaddr *)&options->serverAddress, sizeof(options->serverAddress));
}
else // IPv6
{
status = connect(socket, (struct sockaddr *)&options->serverAddress6, sizeof(options->serverAddress6));
}
if (status < 0 && sock_errno != INPROGRESS)
{
snprintf(error, errlen, "connect: %s", sock_strerror(sock_errno));
return status;
}
// connect() completed immediately
if (status == 0)
return status;
FD_ZERO(&rset);
FD_SET(socket, &rset);
wset = eset = rset;
tval.tv_sec = options->connect_timeout;
tval.tv_usec = 0;
if ((status = select(socket + 1, &rset, &wset, &eset, &tval)) == 0)
{
snprintf(error, errlen, "connect: Timed out");
return -1;
}
else if (status < 0)
{
snprintf(error, errlen, "connect: select: %s", sock_strerror(sock_errno));
return status;
}
if (FD_ISSET(socket, &rset) || FD_ISSET(socket, &wset) || FD_ISSET(socket, &eset))
{
len = sizeof(errn);
if (getsockopt(socket, SOL_SOCKET, SO_ERROR, (void *)&errn, (socklen_t *)&len) < 0)
{
snprintf(error, errlen, "connect: getsockopt: %s", sock_strerror(errn));
return -1;
}
}
if (errn)
{
snprintf(error, errlen, "connect: %s", sock_strerror(errn));
return -1;
}
#ifdef _WIN32
flags = 0;
if ((status = ioctlsocket(socket, FIONBIO, (u_long *)&flags)) != NO_ERROR)
{
snprintf(error, errlen, "ioctlsocket: %s", sock_strerror(sock_errno));
return -1;
}
#else
if (fcntl(socket, F_SETFL, flags) < 0)
{
snprintf(error, errlen, "fcntl setfl: %s", sock_strerror(sock_errno));
return -1;
}
#endif
return status;
}
// Create a TCP socket
int tcpConnect(struct sslCheckOptions *options)
{
//Sleep if required
if (options->sleep > 0)
{
SLEEPMS(options->sleep);
}
// Variables...
int socketDescriptor;
int tlsStarted = 0;
char buffer[BUFFERSIZE], errmsg[BUFFERSIZE];
int status;
// Create Socket
if (options->h_addrtype == AF_INET)
{
socketDescriptor = socket(AF_INET, SOCK_STREAM, 0);
}
else // IPv6
{
socketDescriptor = socket(AF_INET6, SOCK_STREAM, 0);
}
if(socketDescriptor < 0)
{
printf_error("Could not open a socket.");
return 0;
}
// Set socket timeout
#ifdef _WIN32
// Windows isn't looking for a timeval struct like in UNIX; it wants a timeout in a DWORD represented in milliseconds...
DWORD timeout = (options->timeout.tv_sec * 1000) + (options->timeout.tv_usec / 1000);
setsockopt(socketDescriptor, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));
setsockopt(socketDescriptor, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout));
#else
setsockopt(socketDescriptor, SOL_SOCKET, SO_RCVTIMEO, (char *)&options->timeout, sizeof(struct timeval));
setsockopt(socketDescriptor, SOL_SOCKET, SO_SNDTIMEO, (char *)&options->timeout, sizeof(struct timeval));
#endif
status = tcpConnectSocket(socketDescriptor, options, errmsg, BUFFERSIZE);
if(status < 0)
{
printf_error("Could not open a connection to host %s (%s) on port %d (%s).", options->host, options->addrstr,
options->port, errmsg);
close(socketDescriptor);
return 0;
}
// If STARTTLS is required...
if (options->starttls_smtp == true && tlsStarted == false)
{
tlsStarted = 1;
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
if (strncmp(buffer, "220", 3) != 0)
{
close(socketDescriptor);
printf_error("The host %s on port %d did not appear to be an SMTP service.", options->host, options->port);
return 0;
}
sendString(socketDescriptor, "EHLO example.org\r\n");
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
if (strncmp(buffer, "250", 3) != 0)
{
close(socketDescriptor);
printf_error("The SMTP service on %s port %d did not respond with status 250 to our HELO.", options->host, options->port);
return 0;
}
sendString(socketDescriptor, "STARTTLS\r\n");
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
if (strncmp(buffer, "220", 3) != 0)
{
close(socketDescriptor);
printf_error("The SMTP service on %s port %d did not appear to support STARTTLS.", options->host, options->port);
return 0;
}
}
if (options->starttls_mysql == true && tlsStarted == false)
{
tlsStarted = 1;
// Taken from https://github.com/tetlowgm/sslscan/blob/master/sslscan.c
const char mysqlssl[] = { 0x20, 0x00, 0x00, 0x01, 0x85, 0xae, 0x7f, 0x00,
0x00, 0x00, 0x00, 0x01, 0x21, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00};
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
send(socketDescriptor, mysqlssl, sizeof(mysqlssl), 0);
}
// We could use an XML parser but frankly it seems like a security disaster
if (options->starttls_xmpp == true && tlsStarted == false)
{
/* This is so ghetto, you cannot release it! */
char xmpp_setup[1024]; // options->host is 512 bytes long
/* XXX: TODO - options->host isn't always the host you want to test
eg:
talk.google.com actually expects gmail.com, not talk.google.com
jabber.ccc.de expects jabber.ccc.de
It may be useful to provide a commandline switch to provide the
expected hostname.
*/
// Server to server handshake
if (options->xmpp_server)
{
if (snprintf(xmpp_setup, sizeof(xmpp_setup), "<?xml version='1.0' ?>\r\n"
"<stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:server' to='%s' version='1.0'>\r\n", options->host) >= sizeof(xmpp_setup)) {
printf("(internal error: xmpp_setup buffer too small)\n");
abort();
}
}
// Client to server handshake (default)
else
{
if (snprintf(xmpp_setup, sizeof(xmpp_setup), "<?xml version='1.0' ?>\r\n"
"<stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:client' to='%s' version='1.0'>\r\n", options->host) >= sizeof(xmpp_setup)) {
printf("(internal error: xmpp_setup buffer too small)\n");
abort();
}
}
tlsStarted = 1;
sendString(socketDescriptor, xmpp_setup);
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
printf_verbose("Server reported: %s\nAttempting to STARTTLS\n", buffer);
sendString(socketDescriptor, "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>\r\n");
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
/* We're looking for something like:
<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'
If we find the end of the stream features before we find tls, we may
not have STARTTLS support. */
if (strstr(buffer, "urn:ietf:params:xml:ns:xmpp-tls")) {
printf_verbose("It appears that xmpp-tls was detected.\n");
} else if (strstr(buffer, "/stream:features")) {
printf_verbose("It appears that xmpp-tls was not detected.\n");
}
if (options->verbose)
printf("Server reported: %s\n", buffer);
if (strstr(buffer, "<proceed"))
{
printf_verbose("It appears that xmpp-tls is ready for TLS.\n");
}
else
{
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
}
printf_verbose("Server reported: %s\n", buffer);
}
// Setup a POP3 STARTTLS socket
if (options->starttls_pop3 == true && tlsStarted == false)
{
tlsStarted = 1;
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
printf_verbose("Server reported: %s\n", buffer);
sendString(socketDescriptor, "STLS\r\n");
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
// We probably want to confirm that we see something like:
// '+OK Begin SSL/TLS negotiation now.'
// Or
// '+OK Begin TLS negotiation, mate'
if (strstr(buffer, "+OK Begin")) {
printf_verbose("It appears that the POP3 server is ready for TLS.\n");
}
printf_verbose("Server reported: %s\n", buffer);
}
// Setup an IMAP STARTTLS socket
if (options->starttls_imap == true && tlsStarted == false)
{
tlsStarted = 1;
memset(buffer, 0, BUFFERSIZE);
// Fetch the IMAP banner
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
printf_verbose("Server banner: %s\n", buffer);
// Attempt to STARTTLS
sendString(socketDescriptor, ". STARTTLS\r\n");
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
if (strstr(buffer, ". OK") || strstr(buffer, " . OK")){
printf_verbose("STARTLS IMAP setup complete.\nServer reported: %s\n", buffer);
} else{
printf_verbose("STARTLS IMAP setup not complete.\nServer reported: %s\n", buffer);
}
}
if (options->starttls_irc == true && tlsStarted == false)
{
tlsStarted = 1;
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
printf_verbose("Server reported: %s\n", buffer);
// Attempt to STARTTLS
sendString(socketDescriptor, "STARTTLS\r\n");
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
if (strstr(buffer, " 670 ") || strstr(buffer, ":STARTTLS successful")) {
printf_verbose("STARTLS IRC setup complete.\nServer reported %s\n", buffer);
} else {
printf_verbose("STARTLS IRC setup not complete.\nServer reported %s\n", buffer);
}
}
// Setup a LDAP STARTTLS socket
if (options->starttls_ldap == true && tlsStarted == false)
{
tlsStarted = 1;
memset(buffer, 0, BUFFERSIZE);
char starttls[] = {'0', 0x1d, 0x02, 0x01, 0x01, 'w', 0x18, 0x80, 0x16,
'1', '.', '3', '.', '6', '.', '1', '.', '4', '.', '1', '.',
'1', '4', '6', '6', '.', '2', '0', '0', '3', '7'};
char ok[] = "1.3.6.1.4.1.1466.20037";
char unsupported[] = "unsupported extended operation";
// Send TLS
send(socketDescriptor, starttls, sizeof(starttls), 0);
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
if (memmem(buffer, BUFFERSIZE, ok, strlen(ok))) {
printf_verbose("STARTLS LDAP setup complete.\n");
}
else if (strstr(buffer, unsupported)) {
printf_error("STARTLS LDAP connection to %s:%d failed with '%s'.",
options->host, options->port, unsupported);
return 0;
} else {
printf_error("STARTLS LDAP connection to %s:%d failed with unknown error.",
options->host, options->port);
return 0;
}
}
// Setup a FTP STARTTLS socket
if (options->starttls_ftp == true && tlsStarted == false)
{
tlsStarted = 1;
// Fetch the server banner
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
printf_verbose("Server banner: %s\n", buffer);
// Send TLS request
sendString(socketDescriptor, "AUTH TLS\r\n");
if (!readOrLogAndClose(socketDescriptor, buffer, BUFFERSIZE, options))
return 0;
if (strstr(buffer, "234 AUTH TLS successful")) {
printf_verbose("STARTLS FTP setup complete.\n");
} else {
printf_verbose("STARTLS FTP setup possibly not complete.\n");
}
printf_verbose("Server reported: %s\n", buffer);
}
if (options->starttls_psql == true && tlsStarted == false)
{
unsigned char buffer;
tlsStarted = 1;
// Send SSLRequest packet
send(socketDescriptor, "\x00\x00\x00\x08\x04\xd2\x16\x2f", 8, 0);
// Read reply byte
if (1 != recv(socketDescriptor, &buffer, 1, 0)) {
printf_error("Unexpected EOF reading from %s:%d", options->host, options->port);
return 0;
}
if (buffer != 'S') {
printf_error("Server at %s:%d rejected TLS startup", options->host, options->port);
return 0;
}
}
// Setup an RDP socket with preamble
// Borrowed from https://labs.portcullis.co.uk/tools/ssl-cipher-suite-enum/
if (options->rdp == true && tlsStarted == false)
{
unsigned char buffer[32768];
size_t readlen;
tlsStarted = 1;
// Send RDP preamble
send(socketDescriptor, "\x03\x00\x00\x13\x0e\xe0\x00\x00\x00\x00\x00\x01\x00\x08\x00\x03\x00\x00\x00", 19, 0);
// Read reply header
if (4 != recv(socketDescriptor, buffer, 4, 0)) {
printf_error("Unexpected EOF reading from %s:%d", options->host, options->port);
return 0;
}
// Calculate remaining bytes (and check for overflows)
readlen = ((buffer[2] & 0x7f) << 8) + buffer[3] - 4;
if (readlen > sizeof(buffer)) {
printf_error("Unexpected data from %s:%d", options->host, options->port);
return 0;
}
// Read reply data
if (readlen != recv(socketDescriptor, buffer, readlen, 0)) {
printf_error("Unexpected EOF reading from %s:%d", options->host, options->port);
return 0;
}
}
// Return
return socketDescriptor;
}
// Private Key Password Callback...
static int password_callback(char *buf, int size, int rwflag, void *userdata)
{
strncpy(buf, (char *)userdata, size);
// I don't know the semantics of these arguments, but it looks like this
// could go badly wrong if userdata is too long.
buf[strlen(userdata)] = 0;
return strlen(userdata);
}
// Load client certificates/private keys...
int loadCerts(struct sslCheckOptions *options)
{
// Variables...
int status = 1;
PKCS12 *pk12 = NULL;
FILE *pk12File = NULL;
X509 *cert = NULL;
EVP_PKEY *pkey = NULL;
STACK_OF(X509) *ca = NULL;
// Configure PKey password...
if (options->privateKeyPassword != 0)
{
SSL_CTX_set_default_passwd_cb_userdata(options->ctx, (void *)options->privateKeyPassword);
SSL_CTX_set_default_passwd_cb(options->ctx, password_callback);
}
// Separate Certs and PKey Files...
if ((options->clientCertsFile != 0) && (options->privateKeyFile != 0))
{
// Load Cert...
if (!SSL_CTX_use_certificate_file(options->ctx, options->clientCertsFile, SSL_FILETYPE_PEM))
{
if (!SSL_CTX_use_certificate_file(options->ctx, options->clientCertsFile, SSL_FILETYPE_ASN1))
{
if (!SSL_CTX_use_certificate_chain_file(options->ctx, options->clientCertsFile))
{
printf("%s Could not configure certificate(s).%s\n", COL_RED, RESET);
status = 0;
}
}
}
// Load PKey...
if (status != 0)
{
if (!SSL_CTX_use_PrivateKey_file(options->ctx, options->privateKeyFile, SSL_FILETYPE_PEM))
{
if (!SSL_CTX_use_PrivateKey_file(options->ctx, options->privateKeyFile, SSL_FILETYPE_ASN1))
{
// Why would the more specific functions succeed if the generic functions failed?
// -- I'm guessing that the original author was hopeful? - io
if (!SSL_CTX_use_RSAPrivateKey_file(options->ctx, options->privateKeyFile, SSL_FILETYPE_PEM))
{
if (!SSL_CTX_use_RSAPrivateKey_file(options->ctx, options->privateKeyFile, SSL_FILETYPE_ASN1))
{
printf("%s Could not configure private key.%s\n", COL_RED, RESET);
status = 0;
}
}
}
}
}
}
// PKCS Cert and PKey File...
else if (options->privateKeyFile != 0)
{
pk12File = fopen(options->privateKeyFile, "rb");
if (pk12File != NULL)
{
pk12 = d2i_PKCS12_fp(pk12File, NULL);
if (!pk12)
{
status = 0;
printf("%s Could not read PKCS#12 file.%s\n", COL_RED, RESET);
}
else
{
if (!PKCS12_parse(pk12, options->privateKeyPassword, &pkey, &cert, &ca))
{
status = 0;
printf("%s Error parsing PKCS#12. Are you sure that password was correct?%s\n", COL_RED, RESET);
}
else
{
if (!SSL_CTX_use_certificate(options->ctx, cert))
{
status = 0;
printf("%s Could not configure certificate.%s\n", COL_RED, RESET);
}
if (!SSL_CTX_use_PrivateKey(options->ctx, pkey))
{
status = 0;
printf("%s Could not configure private key.%s\n", COL_RED, RESET);
}
}
PKCS12_free(pk12);
}
fclose(pk12File);
}
else
{
printf("%s Could not open PKCS#12 file.%s\n", COL_RED, RESET);
status = 0;
}
}
// Check Cert/Key...
if (status != 0)
{
if (!SSL_CTX_check_private_key(options->ctx))
{
printf("%s Private key does not match certificate.%s\n", COL_RED, RESET);
return false;
}
else
return true;
}
else
return false;
}
// Test renegotiation
int outputRenegotiation( struct sslCheckOptions *options, struct renegotiationOutput *outputData)
{
printf_xml(" <renegotiation supported=\"%d\" secure=\"%d\" />\n",
outputData->supported, outputData->secure);
if (outputData->secure)
{
printf("%sSecure%s session renegotiation supported\n\n", COL_GREEN, RESET);
}
else if (outputData->supported)
{
printf("%sInsecure%s session renegotiation supported\n\n", COL_RED, RESET);
}
else
{
printf("Session renegotiation %snot supported%s\n\n", COL_GREEN, RESET);
}
return true;
}
struct renegotiationOutput * newRenegotiationOutput( void )
{
struct renegotiationOutput *myRenOut;
myRenOut = calloc(1,sizeof(struct renegotiationOutput));
return( myRenOut );
}
int freeRenegotiationOutput( struct renegotiationOutput *myRenOut )
{
if ( myRenOut != NULL) {
free(myRenOut);
}
return true;
}
void tls_reneg_init(struct sslCheckOptions *options)
{
/* Borrowed from tortls.c to dance with OpenSSL on many platforms, with
* many versions and release of OpenSSL. */
SSL_library_init();
SSL_load_error_strings();
long version = SSLeay();
if (version >= 0x009080c0L && version < 0x009080d0L) {
printf_verbose("OpenSSL %s looks like version 0.9.8l; I will try SSL3_FLAGS to enable renegotiation.\n",
SSLeay_version(SSLEAY_VERSION));
use_unsafe_renegotiation_flag = 1;
use_unsafe_renegotiation_op = 1;
} else if (version >= 0x009080d0L) {
printf_verbose("OpenSSL %s looks like version 0.9.8m or later; "
"I will try SSL_OP to enable renegotiation\n",
SSLeay_version(SSLEAY_VERSION));
use_unsafe_renegotiation_op = 1;
} else if (version < 0x009080c0L) {
printf_verbose("OpenSSL %s [%lx] looks like it's older than "
"0.9.8l, but some vendors have backported 0.9.8l's "
"renegotiation code to earlier versions, and some have "
"backported the code from 0.9.8m or 0.9.8n. I'll set both "
"SSL3_FLAGS and SSL_OP just to be safe.\n",
SSLeay_version(SSLEAY_VERSION), version);
use_unsafe_renegotiation_flag = 1;
use_unsafe_renegotiation_op = 1;
} else {
printf_verbose("OpenSSL %s has version %lx\n",
SSLeay_version(SSLEAY_VERSION), version);
}
#ifdef SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
SSL_CTX_set_options(options->ctx,
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);
#endif
}
// Check if the server supports compression
int testCompression(struct sslCheckOptions *options, const SSL_METHOD *sslMethod)
{
// Variables...
int status = true;
int socketDescriptor = 0;
SSL *ssl = NULL;
BIO *cipherConnectionBio;
SSL_SESSION *session;
// Connect to host
socketDescriptor = tcpConnect(options);
if (socketDescriptor != 0)
{
// Setup Context Object...
options->ctx = new_CTX(sslMethod);
tls_reneg_init(options);
if (options->ctx != NULL)
{
if (SSL_CTX_set_cipher_list(options->ctx, CIPHERSUITE_LIST_ALL) != 0)
{
// Load Certs if required...
if ((options->clientCertsFile != 0) || (options->privateKeyFile != 0))
status = loadCerts(options);
if (status == true)
{
// Create SSL object...
ssl = new_SSL(options->ctx);
#if ( OPENSSL_VERSION_NUMBER > 0x009080cfL )
// Make sure we can connect to insecure servers
// OpenSSL is going to change the default at a later date
SSL_set_options(ssl, SSL_OP_LEGACY_SERVER_CONNECT);
#endif
#ifdef SSL_OP_NO_COMPRESSION
// Make sure to clear the no compression flag
SSL_clear_options(ssl, SSL_OP_NO_COMPRESSION);
#endif