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aa4b90d250
xrdp/common/ssl_calls.c
Koichiro IWAO aa4b90d250 Change log level DEBUG -> WARNING 
since unavailability of ssl protocols defined in config file
may weaken security and it is important for users.
2017-07-06 13:14:27 +09:00

933 lines
22 KiB
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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2014
* Copyright (C) Idan Freiberg 2013-2014
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* ssl calls
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include <stdlib.h> /* needed for openssl headers */
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rc4.h>
#include <openssl/md5.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include "os_calls.h"
#include "arch.h"
#include "ssl_calls.h"
#include "trans.h"
#include "log.h"
#define SSL_WANT_READ_WRITE_TIMEOUT 100
#if OPENSSL_VERSION_NUMBER < 0x10100000L
static inline HMAC_CTX *
HMAC_CTX_new(void)
{
HMAC_CTX *hmac_ctx = g_new(HMAC_CTX, 1);
HMAC_CTX_init(hmac_ctx);
return hmac_ctx;
}
static inline void
HMAC_CTX_free(HMAC_CTX *hmac_ctx)
{
HMAC_CTX_cleanup(hmac_ctx);
g_free(hmac_ctx);
}
static inline void
RSA_get0_key(const RSA *key, const BIGNUM **n, const BIGNUM **e,
const BIGNUM **d)
{
*n = key->n;
*d = key->d;
}
#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
/*****************************************************************************/
int
ssl_init(void)
{
SSL_load_error_strings();
SSL_library_init();
return 0;
}
/*****************************************************************************/
int
ssl_finish(void)
{
return 0;
}
/* rc4 stuff */
/*****************************************************************************/
void *
ssl_rc4_info_create(void)
{
return g_malloc(sizeof(RC4_KEY), 1);
}
/*****************************************************************************/
void
ssl_rc4_info_delete(void *rc4_info)
{
g_free(rc4_info);
}
/*****************************************************************************/
void
ssl_rc4_set_key(void *rc4_info, char *key, int len)
{
RC4_set_key((RC4_KEY *)rc4_info, len, (tui8 *)key);
}
/*****************************************************************************/
void
ssl_rc4_crypt(void *rc4_info, char *data, int len)
{
RC4((RC4_KEY *)rc4_info, len, (tui8 *)data, (tui8 *)data);
}
/* sha1 stuff */
/*****************************************************************************/
void *
ssl_sha1_info_create(void)
{
return g_malloc(sizeof(SHA_CTX), 1);
}
/*****************************************************************************/
void
ssl_sha1_info_delete(void *sha1_info)
{
g_free(sha1_info);
}
/*****************************************************************************/
void
ssl_sha1_clear(void *sha1_info)
{
SHA1_Init((SHA_CTX *)sha1_info);
}
/*****************************************************************************/
void
ssl_sha1_transform(void *sha1_info, const char *data, int len)
{
SHA1_Update((SHA_CTX *)sha1_info, data, len);
}
/*****************************************************************************/
void
ssl_sha1_complete(void *sha1_info, char *data)
{
SHA1_Final((tui8 *)data, (SHA_CTX *)sha1_info);
}
/* md5 stuff */
/*****************************************************************************/
void *
ssl_md5_info_create(void)
{
return g_malloc(sizeof(MD5_CTX), 1);
}
/*****************************************************************************/
void
ssl_md5_info_delete(void *md5_info)
{
g_free(md5_info);
}
/*****************************************************************************/
void
ssl_md5_clear(void *md5_info)
{
MD5_Init((MD5_CTX *)md5_info);
}
/*****************************************************************************/
void
ssl_md5_transform(void *md5_info, char *data, int len)
{
MD5_Update((MD5_CTX *)md5_info, data, len);
}
/*****************************************************************************/
void
ssl_md5_complete(void *md5_info, char *data)
{
MD5_Final((tui8 *)data, (MD5_CTX *)md5_info);
}
/* FIPS stuff */
/*****************************************************************************/
void *
ssl_des3_encrypt_info_create(const char *key, const char* ivec)
{
EVP_CIPHER_CTX *des3_ctx;
const tui8 *lkey;
const tui8 *livec;
des3_ctx = EVP_CIPHER_CTX_new();
lkey = (const tui8 *) key;
livec = (const tui8 *) ivec;
EVP_EncryptInit_ex(des3_ctx, EVP_des_ede3_cbc(), NULL, lkey, livec);
EVP_CIPHER_CTX_set_padding(des3_ctx, 0);
return des3_ctx;
}
/*****************************************************************************/
void *
ssl_des3_decrypt_info_create(const char *key, const char* ivec)
{
EVP_CIPHER_CTX *des3_ctx;
const tui8 *lkey;
const tui8 *livec;
des3_ctx = EVP_CIPHER_CTX_new();
lkey = (const tui8 *) key;
livec = (const tui8 *) ivec;
EVP_DecryptInit_ex(des3_ctx, EVP_des_ede3_cbc(), NULL, lkey, livec);
EVP_CIPHER_CTX_set_padding(des3_ctx, 0);
return des3_ctx;
}
/*****************************************************************************/
void
ssl_des3_info_delete(void *des3)
{
EVP_CIPHER_CTX *des3_ctx;
des3_ctx = (EVP_CIPHER_CTX *) des3;
if (des3_ctx != 0)
{
EVP_CIPHER_CTX_free(des3_ctx);
}
}
/*****************************************************************************/
int
ssl_des3_encrypt(void *des3, int length, const char *in_data, char *out_data)
{
EVP_CIPHER_CTX *des3_ctx;
int len;
const tui8 *lin_data;
tui8 *lout_data;
des3_ctx = (EVP_CIPHER_CTX *) des3;
lin_data = (const tui8 *) in_data;
lout_data = (tui8 *) out_data;
len = 0;
EVP_EncryptUpdate(des3_ctx, lout_data, &len, lin_data, length);
return 0;
}
/*****************************************************************************/
int
ssl_des3_decrypt(void *des3, int length, const char *in_data, char *out_data)
{
EVP_CIPHER_CTX *des3_ctx;
int len;
const tui8 *lin_data;
tui8 *lout_data;
des3_ctx = (EVP_CIPHER_CTX *) des3;
lin_data = (const tui8 *) in_data;
lout_data = (tui8 *) out_data;
len = 0;
EVP_DecryptUpdate(des3_ctx, lout_data, &len, lin_data, length);
return 0;
}
/*****************************************************************************/
void *
ssl_hmac_info_create(void)
{
HMAC_CTX *hmac_ctx;
hmac_ctx = HMAC_CTX_new();
return hmac_ctx;
}
/*****************************************************************************/
void
ssl_hmac_info_delete(void *hmac)
{
HMAC_CTX *hmac_ctx;
hmac_ctx = (HMAC_CTX *) hmac;
if (hmac_ctx != 0)
{
HMAC_CTX_free(hmac_ctx);
}
}
/*****************************************************************************/
void
ssl_hmac_sha1_init(void *hmac, const char *data, int len)
{
HMAC_CTX *hmac_ctx;
hmac_ctx = (HMAC_CTX *) hmac;
HMAC_Init_ex(hmac_ctx, data, len, EVP_sha1(), NULL);
}
/*****************************************************************************/
void
ssl_hmac_transform(void *hmac, const char *data, int len)
{
HMAC_CTX *hmac_ctx;
const tui8 *ldata;
hmac_ctx = (HMAC_CTX *) hmac;
ldata = (const tui8*) data;
HMAC_Update(hmac_ctx, ldata, len);
}
/*****************************************************************************/
void
ssl_hmac_complete(void *hmac, char *data, int len)
{
HMAC_CTX *hmac_ctx;
tui8* ldata;
tui32 llen;
hmac_ctx = (HMAC_CTX *) hmac;
ldata = (tui8 *) data;
llen = len;
HMAC_Final(hmac_ctx, ldata, &llen);
}
/*****************************************************************************/
static void
ssl_reverse_it(char *p, int len)
{
int i;
int j;
char temp;
i = 0;
j = len - 1;
while (i < j)
{
temp = p[i];
p[i] = p[j];
p[j] = temp;
i++;
j--;
}
}
/*****************************************************************************/
int
ssl_mod_exp(char *out, int out_len, const char *in, int in_len,
const char *mod, int mod_len, const char *exp, int exp_len)
{
BN_CTX *ctx;
BIGNUM *lmod;
BIGNUM *lexp;
BIGNUM *lin;
BIGNUM *lout;
int rv;
char *l_out;
char *l_in;
char *l_mod;
char *l_exp;
l_out = (char *)g_malloc(out_len, 1);
l_in = (char *)g_malloc(in_len, 1);
l_mod = (char *)g_malloc(mod_len, 1);
l_exp = (char *)g_malloc(exp_len, 1);
g_memcpy(l_in, in, in_len);
g_memcpy(l_mod, mod, mod_len);
g_memcpy(l_exp, exp, exp_len);
ssl_reverse_it(l_in, in_len);
ssl_reverse_it(l_mod, mod_len);
ssl_reverse_it(l_exp, exp_len);
ctx = BN_CTX_new();
lmod = BN_new();
lexp = BN_new();
lin = BN_new();
lout = BN_new();
BN_bin2bn((tui8 *)l_mod, mod_len, lmod);
BN_bin2bn((tui8 *)l_exp, exp_len, lexp);
BN_bin2bn((tui8 *)l_in, in_len, lin);
BN_mod_exp(lout, lin, lexp, lmod, ctx);
rv = BN_bn2bin(lout, (tui8 *)l_out);
if (rv <= out_len)
{
ssl_reverse_it(l_out, rv);
g_memcpy(out, l_out, out_len);
}
else
{
rv = 0;
}
BN_free(lin);
BN_free(lout);
BN_free(lexp);
BN_free(lmod);
BN_CTX_free(ctx);
g_free(l_out);
g_free(l_in);
g_free(l_mod);
g_free(l_exp);
return rv;
}
/*****************************************************************************/
/* returns error
generates a new rsa key
exp is passed in and mod and pri are passed out */
int
ssl_gen_key_xrdp1(int key_size_in_bits, const char *exp, int exp_len,
char *mod, int mod_len, char *pri, int pri_len)
{
BIGNUM *my_e;
RSA *my_key;
char *lexp;
char *lmod;
char *lpri;
int error;
int len;
int diff;
if ((exp_len != 4) || ((mod_len != 64) && (mod_len != 256)) ||
((pri_len != 64) && (pri_len != 256)))
{
return 1;
}
diff = 0;
lexp = (char *)g_malloc(exp_len, 1);
lmod = (char *)g_malloc(mod_len, 1);
lpri = (char *)g_malloc(pri_len, 1);
g_memcpy(lexp, exp, exp_len);
ssl_reverse_it(lexp, exp_len);
my_e = BN_new();
BN_bin2bn((tui8 *)lexp, exp_len, my_e);
my_key = RSA_new();
error = RSA_generate_key_ex(my_key, key_size_in_bits, my_e, 0) == 0;
const BIGNUM *n;
const BIGNUM *d;
RSA_get0_key(my_key, &n, NULL, &d);
if (error == 0)
{
len = BN_num_bytes(n);
error = (len < 1) || (len > mod_len);
diff = mod_len - len;
}
if (error == 0)
{
BN_bn2bin(n, (tui8 *)(lmod + diff));
ssl_reverse_it(lmod, mod_len);
}
if (error == 0)
{
len = BN_num_bytes(d);
error = (len < 1) || (len > pri_len);
diff = pri_len - len;
}
if (error == 0)
{
BN_bn2bin(d, (tui8 *)(lpri + diff));
ssl_reverse_it(lpri, pri_len);
}
if (error == 0)
{
g_memcpy(mod, lmod, mod_len);
g_memcpy(pri, lpri, pri_len);
}
BN_free(my_e);
RSA_free(my_key);
g_free(lexp);
g_free(lmod);
g_free(lpri);
return error;
}
/*****************************************************************************/
struct ssl_tls *
ssl_tls_create(struct trans *trans, const char *key, const char *cert)
{
struct ssl_tls *self;
int pid;
char buf[1024];
self = (struct ssl_tls *) g_malloc(sizeof(struct ssl_tls), 1);
if (self != NULL)
{
self->trans = trans;
self->cert = (char *) cert;
self->key = (char *) key;
pid = g_getpid();
g_snprintf(buf, 1024, "xrdp_%8.8x_tls_rwo", pid);
self->rwo = g_create_wait_obj(buf);
}
return self;
}
/*****************************************************************************/
int
ssl_tls_print_error(const char *func, SSL *connection, int value)
{
switch (SSL_get_error(connection, value))
{
case SSL_ERROR_ZERO_RETURN:
g_writeln("ssl_tls_print_error: %s: Server closed TLS connection",
func);
return 1;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
return 0;
case SSL_ERROR_SYSCALL:
g_writeln("ssl_tls_print_error: %s: I/O error", func);
return 1;
case SSL_ERROR_SSL:
g_writeln("ssl_tls_print_error: %s: Failure in SSL library (protocol error?)",
func);
return 1;
default:
g_writeln("ssl_tls_print_error: %s: Unknown error", func);
return 1;
}
}
/*****************************************************************************/
int
ssl_tls_accept(struct ssl_tls *self, long ssl_protocols,
const char *tls_ciphers)
{
int connection_status;
long options = 0;
/**
* SSL_OP_NO_SSLv2
* SSLv3 is used by, eg. Microsoft RDC for Mac OS X.
*/
options |= SSL_OP_NO_SSLv2;
/**
* Disable SSL protocols not listed in ssl_protocols.
*/
options |= ssl_protocols;
#if defined(SSL_OP_NO_COMPRESSION)
/**
* SSL_OP_NO_COMPRESSION:
*
* The Microsoft RDP server does not advertise support
* for TLS compression, but alternative servers may support it.
* This was observed between early versions of the FreeRDP server
* and the FreeRDP client, and caused major performance issues,
* which is why we're disabling it.
*/
options |= SSL_OP_NO_COMPRESSION;
#endif
/**
* SSL_OP_TLS_BLOCK_PADDING_BUG:
*
* The Microsoft RDP server does *not* support TLS padding.
* It absolutely needs to be disabled otherwise it won't work.
*/
options |= SSL_OP_TLS_BLOCK_PADDING_BUG;
/**
* SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS:
*
* Just like TLS padding, the Microsoft RDP server does not
* support empty fragments. This needs to be disabled.
*/
options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
self->ctx = SSL_CTX_new(SSLv23_server_method());
/* set context options */
SSL_CTX_set_mode(self->ctx,
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
SSL_MODE_ENABLE_PARTIAL_WRITE);
SSL_CTX_set_options(self->ctx, options);
if (g_strlen(tls_ciphers) > 1)
{
if (SSL_CTX_set_cipher_list(self->ctx, tls_ciphers) == 0)
{
g_writeln("ssl_tls_accept: invalid cipher options");
return 1;
}
}
SSL_CTX_set_read_ahead(self->ctx, 1);
if (self->ctx == NULL)
{
g_writeln("ssl_tls_accept: SSL_CTX_new failed");
return 1;
}
if (SSL_CTX_use_RSAPrivateKey_file(self->ctx, self->key, SSL_FILETYPE_PEM)
<= 0)
{
g_writeln("ssl_tls_accept: SSL_CTX_use_RSAPrivateKey_file failed");
return 1;
}
if (SSL_CTX_use_certificate_chain_file(self->ctx, self->cert) <= 0)
{
g_writeln("ssl_tls_accept: SSL_CTX_use_certificate_chain_file failed");
return 1;
}
self->ssl = SSL_new(self->ctx);
if (self->ssl == NULL)
{
g_writeln("ssl_tls_accept: SSL_new failed");
return 1;
}
if (SSL_set_fd(self->ssl, self->trans->sck) < 1)
{
g_writeln("ssl_tls_accept: SSL_set_fd failed");
return 1;
}
while(1) {
connection_status = SSL_accept(self->ssl);
if (connection_status <= 0)
{
if (ssl_tls_print_error("SSL_accept", self->ssl, connection_status))
{
return 1;
}
/**
* retry when SSL_get_error returns:
* SSL_ERROR_WANT_READ
* SSL_ERROR_WANT_WRITE
*/
}
else
{
break;
}
}
g_writeln("ssl_tls_accept: TLS connection accepted");
return 0;
}
/*****************************************************************************/
/* returns error, */
int
ssl_tls_disconnect(struct ssl_tls *self)
{
int status;
if (self == NULL)
{
return 0;
}
if (self->ssl == NULL)
{
return 0;
}
status = SSL_shutdown(self->ssl);
if (status != 1)
{
status = SSL_shutdown(self->ssl);
if (status <= 0)
{
if (ssl_tls_print_error("SSL_shutdown", self->ssl, status))
{
return 1;
}
/**
* retry when SSL_get_error returns:
* SSL_ERROR_WANT_READ
* SSL_ERROR_WANT_WRITE
*/
}
}
return 0;
}
/*****************************************************************************/
void
ssl_tls_delete(struct ssl_tls *self)
{
if (self != NULL)
{
if (self->ssl)
SSL_free(self->ssl);
if (self->ctx)
SSL_CTX_free(self->ctx);
g_delete_wait_obj(self->rwo);
g_free(self);
}
}
/*****************************************************************************/
int
ssl_tls_read(struct ssl_tls *tls, char *data, int length)
{
int status;
int break_flag;
while(1) {
status = SSL_read(tls->ssl, data, length);
switch (SSL_get_error(tls->ssl, status))
{
case SSL_ERROR_NONE:
break_flag = 1;
break;
/**
* retry when SSL_get_error returns:
* SSL_ERROR_WANT_READ
* SSL_ERROR_WANT_WRITE
*/
case SSL_ERROR_WANT_READ:
g_sck_can_recv(tls->trans->sck, SSL_WANT_READ_WRITE_TIMEOUT);
continue;
case SSL_ERROR_WANT_WRITE:
g_sck_can_send(tls->trans->sck, SSL_WANT_READ_WRITE_TIMEOUT);
continue;
/* socket closed */
case SSL_ERROR_ZERO_RETURN:
return 0;
default:
ssl_tls_print_error("SSL_read", tls->ssl, status);
status = -1;
break_flag = 1;
break;
}
if (break_flag)
{
break;
}
}
if (SSL_pending(tls->ssl) > 0)
{
g_set_wait_obj(tls->rwo);
}
return status;
}
/*****************************************************************************/
int
ssl_tls_write(struct ssl_tls *tls, const char *data, int length)
{
int status;
int break_flag;
while(1) {
status = SSL_write(tls->ssl, data, length);
switch (SSL_get_error(tls->ssl, status))
{
case SSL_ERROR_NONE:
break_flag = 1;
break;
/**
* retry when SSL_get_error returns:
* SSL_ERROR_WANT_READ
* SSL_ERROR_WANT_WRITE
*/
case SSL_ERROR_WANT_READ:
g_sck_can_recv(tls->trans->sck, SSL_WANT_READ_WRITE_TIMEOUT);
continue;
case SSL_ERROR_WANT_WRITE:
g_sck_can_send(tls->trans->sck, SSL_WANT_READ_WRITE_TIMEOUT);
continue;
/* socket closed */
case SSL_ERROR_ZERO_RETURN:
return 0;
default:
ssl_tls_print_error("SSL_write", tls->ssl, status);
status = -1;
break_flag = 1;
break;
}
if (break_flag)
{
break;
}
}
return status;
}
/*****************************************************************************/
/* returns boolean */
int
ssl_tls_can_recv(struct ssl_tls *tls, int sck, int millis)
{
if (SSL_pending(tls->ssl) > 0)
{
return 1;
}
g_reset_wait_obj(tls->rwo);
return g_sck_can_recv(sck, millis);
}
/*****************************************************************************/
const char *
ssl_get_version(const struct ssl_st *ssl)
{
return SSL_get_version(ssl);
}
/*****************************************************************************/
const char *
ssl_get_cipher_name(const struct ssl_st *ssl)
{
return SSL_get_cipher_name(ssl);
}
/*****************************************************************************/
int
ssl_get_protocols_from_string(const char *str, long *ssl_protocols)
{
long protocols;
long bad_protocols;
int rv;
if ((str == NULL) || (ssl_protocols == NULL))
{
return 1;
}
rv = 0;
protocols = 0;
#if defined(SSL_OP_NO_SSLv3)
protocols |= SSL_OP_NO_SSLv3;
#endif
#if defined(SSL_OP_NO_TLSv1)
protocols |= SSL_OP_NO_TLSv1;
#endif
#if defined(SSL_OP_NO_TLSv1_1)
protocols |= SSL_OP_NO_TLSv1_1;
#endif
#if defined(SSL_OP_NO_TLSv1_2)
protocols |= SSL_OP_NO_TLSv1_2;
#endif
bad_protocols = protocols;
if (g_pos(str, ",TLSv1.2,") >= 0)
{
#if defined(SSL_OP_NO_TLSv1_2)
log_message(LOG_LEVEL_DEBUG, "TLSv1.2 enabled");
protocols &= ~SSL_OP_NO_TLSv1_2;
#else
log_message(LOG_LEVEL_WARNING,
"TLSv1.2 enabled by config, "
"but not supported by system OpenSSL");
rv |= (1 << 1);
#endif
}
if (g_pos(str, ",TLSv1.1,") >= 0)
{
#if defined(SSL_OP_NO_TLSv1_1)
log_message(LOG_LEVEL_DEBUG, "TLSv1.1 enabled");
protocols &= ~SSL_OP_NO_TLSv1_1;
#else
log_message(LOG_LEVEL_WARNING,
"TLSv1.1 enabled by config, "
"but not supported by system OpenSSL");
rv |= (1 << 2);
#endif
}
if (g_pos(str, ",TLSv1,") >= 0)
{
#if defined(SSL_OP_NO_TLSv1)
log_message(LOG_LEVEL_DEBUG, "TLSv1 enabled");
protocols &= ~SSL_OP_NO_TLSv1;
#else
log_message(LOG_LEVEL_WARNING,
"TLSv1 enabled by config, "
"but not supported by system OpenSSL");
rv |= (1 << 3);
#endif
}
if (g_pos(str, ",SSLv3,") >= 0)
{
#if defined(SSL_OP_NO_SSLv3)
log_message(LOG_LEVEL_DEBUG, "SSLv3 enabled");
protocols &= ~SSL_OP_NO_SSLv3;
#else
log_message(LOG_LEVEL_WARNING,
"SSLv3 enabled by config, "
"but not supported by system OpenSSL");
rv |= (1 << 4);
#endif
}
if (protocols == bad_protocols)
{
log_message(LOG_LEVEL_WARNING, "No SSL/TLS protocols enabled. "
"At least one protocol should be enabled to accept "
"TLS connections.");
rv |= (1 << 5);
}
*ssl_protocols = protocols;
return rv;
}
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