9a160b79 |
/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
* |
58716979 |
* Copyright (C) 2002-2017 OpenVPN Technologies, Inc. <sales@openvpn.net>
* Copyright (C) 2010-2017 Fox Crypto B.V. <openvpn@fox-it.com> |
9a160b79 |
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.
* |
caa54ac3 |
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
9a160b79 |
*/
/**
* @file Control Channel OpenSSL Backend
*/
|
c110b289 |
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
|
9a160b79 |
#include "syshead.h" |
31ea2ee4 |
|
c7ca9133 |
#if defined(ENABLE_CRYPTO_OPENSSL) |
31ea2ee4 |
|
9a160b79 |
#include "errlevel.h"
#include "buffer.h"
#include "misc.h"
#include "manage.h"
#include "memdbg.h"
#include "ssl_backend.h"
#include "ssl_common.h" |
be960aad |
#include "base64.h" |
6554ac9f |
#include "openssl_compat.h" |
9a160b79 |
|
9009aa46 |
#ifdef ENABLE_CRYPTOAPI
#include "cryptoapi.h"
#endif
|
9a160b79 |
#include "ssl_verify_openssl.h"
#include <openssl/err.h>
#include <openssl/pkcs12.h>
#include <openssl/x509.h>
#include <openssl/crypto.h> |
609e8131 |
#ifndef OPENSSL_NO_EC
#include <openssl/ec.h>
#endif |
95993a1d |
/*
* Allocate space in SSL objects in which to store a struct tls_session
* pointer back to parent.
*
*/
int mydata_index; /* GLOBAL */
void |
e2a0cad4 |
tls_init_lib(void) |
95993a1d |
{ |
81d882d5 |
SSL_library_init(); |
39b54baa |
#ifndef ENABLE_SMALL |
81d882d5 |
SSL_load_error_strings(); |
39b54baa |
#endif |
81d882d5 |
OpenSSL_add_all_algorithms(); |
95993a1d |
|
81d882d5 |
mydata_index = SSL_get_ex_new_index(0, "struct session *", NULL, NULL, NULL);
ASSERT(mydata_index >= 0); |
95993a1d |
}
void |
e2a0cad4 |
tls_free_lib(void) |
95993a1d |
{ |
81d882d5 |
EVP_cleanup(); |
39b54baa |
#ifndef ENABLE_SMALL |
81d882d5 |
ERR_free_strings(); |
39b54baa |
#endif |
95993a1d |
}
void |
e2a0cad4 |
tls_clear_error(void) |
95993a1d |
{ |
81d882d5 |
ERR_clear_error(); |
95993a1d |
} |
397c0a35 |
|
62451786 |
void
tls_ctx_server_new(struct tls_root_ctx *ctx)
{ |
81d882d5 |
ASSERT(NULL != ctx); |
62451786 |
|
81d882d5 |
ctx->ctx = SSL_CTX_new(SSLv23_server_method()); |
62451786 |
|
81d882d5 |
if (ctx->ctx == NULL)
{
crypto_msg(M_FATAL, "SSL_CTX_new SSLv23_server_method");
} |
62451786 |
}
void
tls_ctx_client_new(struct tls_root_ctx *ctx)
{ |
81d882d5 |
ASSERT(NULL != ctx); |
62451786 |
|
81d882d5 |
ctx->ctx = SSL_CTX_new(SSLv23_client_method()); |
62451786 |
|
81d882d5 |
if (ctx->ctx == NULL)
{
crypto_msg(M_FATAL, "SSL_CTX_new SSLv23_client_method");
} |
62451786 |
}
void
tls_ctx_free(struct tls_root_ctx *ctx)
{ |
81d882d5 |
ASSERT(NULL != ctx);
if (NULL != ctx->ctx)
{
SSL_CTX_free(ctx->ctx);
}
ctx->ctx = NULL; |
62451786 |
}
|
81d882d5 |
bool
tls_ctx_initialised(struct tls_root_ctx *ctx) |
62451786 |
{ |
81d882d5 |
ASSERT(NULL != ctx);
return NULL != ctx->ctx; |
62451786 |
}
|
685e486e |
void
key_state_export_keying_material(struct key_state_ssl *ssl,
struct tls_session *session)
{ |
81d882d5 |
if (session->opt->ekm_size > 0) |
685e486e |
{
#if (OPENSSL_VERSION_NUMBER >= 0x10001000) |
81d882d5 |
unsigned int size = session->opt->ekm_size;
struct gc_arena gc = gc_new();
unsigned char *ekm = (unsigned char *) gc_malloc(size, true, &gc);
if (SSL_export_keying_material(ssl->ssl, ekm, size,
session->opt->ekm_label, session->opt->ekm_label_size, NULL, 0, 0))
{
unsigned int len = (size * 2) + 2;
const char *key = format_hex_ex(ekm, size, len, 0, NULL, &gc);
setenv_str(session->opt->es, "exported_keying_material", key);
dmsg(D_TLS_DEBUG_MED, "%s: exported keying material: %s",
__func__, key);
}
else
{
msg(M_WARN, "WARNING: Export keying material failed!");
setenv_del(session->opt->es, "exported_keying_material");
}
gc_free(&gc);
#endif /* if (OPENSSL_VERSION_NUMBER >= 0x10001000) */ |
685e486e |
}
}
|
b5563f11 |
/*
* Print debugging information on SSL/TLS session negotiation.
*/
#ifndef INFO_CALLBACK_SSL_CONST
#define INFO_CALLBACK_SSL_CONST const
#endif
static void |
81d882d5 |
info_callback(INFO_CALLBACK_SSL_CONST SSL *s, int where, int ret) |
b5563f11 |
{ |
81d882d5 |
if (where & SSL_CB_LOOP) |
b5563f11 |
{ |
81d882d5 |
dmsg(D_HANDSHAKE_VERBOSE, "SSL state (%s): %s",
where & SSL_ST_CONNECT ? "connect" :
where &SSL_ST_ACCEPT ? "accept" :
"undefined", SSL_state_string_long(s)); |
b5563f11 |
} |
81d882d5 |
else if (where & SSL_CB_ALERT) |
b5563f11 |
{ |
81d882d5 |
dmsg(D_HANDSHAKE_VERBOSE, "SSL alert (%s): %s: %s",
where & SSL_CB_READ ? "read" : "write",
SSL_alert_type_string_long(ret),
SSL_alert_desc_string_long(ret)); |
b5563f11 |
}
}
|
4b67f984 |
/*
* Return maximum TLS version supported by local OpenSSL library.
* Assume that presence of SSL_OP_NO_TLSvX macro indicates that
* TLSvX is supported.
*/
int
tls_version_max(void)
{ |
8ca9eda1 |
#if defined(TLS1_3_VERSION)
return TLS_VER_1_3;
#elif defined(TLS1_2_VERSION) || defined(SSL_OP_NO_TLSv1_2) |
81d882d5 |
return TLS_VER_1_2; |
0e8a30c0 |
#elif defined(TLS1_1_VERSION) || defined(SSL_OP_NO_TLSv1_1) |
81d882d5 |
return TLS_VER_1_1; |
4b67f984 |
#else |
81d882d5 |
return TLS_VER_1_0; |
4b67f984 |
#endif
}
|
0e8a30c0 |
/** Convert internal version number to openssl version number */
static int
openssl_tls_version(int ver)
{
if (ver == TLS_VER_1_0)
{
return TLS1_VERSION;
}
else if (ver == TLS_VER_1_1)
{
return TLS1_1_VERSION;
}
else if (ver == TLS_VER_1_2)
{
return TLS1_2_VERSION;
} |
8ca9eda1 |
#if defined(TLS1_3_VERSION)
else if (ver == TLS_VER_1_3)
{
return TLS1_3_VERSION;
}
#endif |
0e8a30c0 |
return 0;
}
static bool
tls_ctx_set_tls_versions(struct tls_root_ctx *ctx, unsigned int ssl_flags)
{
int tls_ver_min = openssl_tls_version(
(ssl_flags >> SSLF_TLS_VERSION_MIN_SHIFT) & SSLF_TLS_VERSION_MIN_MASK);
int tls_ver_max = openssl_tls_version(
(ssl_flags >> SSLF_TLS_VERSION_MAX_SHIFT) & SSLF_TLS_VERSION_MAX_MASK);
if (!tls_ver_min)
{
/* Enforce at least TLS 1.0 */
int cur_min = SSL_CTX_get_min_proto_version(ctx->ctx);
tls_ver_min = cur_min < TLS1_VERSION ? TLS1_VERSION : cur_min;
}
if (!SSL_CTX_set_min_proto_version(ctx->ctx, tls_ver_min))
{
msg(D_TLS_ERRORS, "%s: failed to set minimum TLS version", __func__);
return false;
}
if (tls_ver_max && !SSL_CTX_set_max_proto_version(ctx->ctx, tls_ver_max))
{
msg(D_TLS_ERRORS, "%s: failed to set maximum TLS version", __func__);
return false;
}
return true;
}
bool |
81d882d5 |
tls_ctx_set_options(struct tls_root_ctx *ctx, unsigned int ssl_flags) |
b5563f11 |
{ |
81d882d5 |
ASSERT(NULL != ctx); |
b8cdb213 |
|
81d882d5 |
/* default certificate verification flags */
int flags = SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT; |
6cb15b90 |
|
0e8a30c0 |
/* process SSL options */
long sslopt = SSL_OP_SINGLE_DH_USE | SSL_OP_NO_TICKET; |
5fd8e94d |
#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE |
0e8a30c0 |
sslopt |= SSL_OP_CIPHER_SERVER_PREFERENCE; |
5fd8e94d |
#endif |
0e8a30c0 |
sslopt |= SSL_OP_NO_COMPRESSION;
SSL_CTX_set_options(ctx->ctx, sslopt);
if (!tls_ctx_set_tls_versions(ctx, ssl_flags))
{
return false; |
81d882d5 |
} |
4b67f984 |
|
a6c573d2 |
#ifdef SSL_MODE_RELEASE_BUFFERS |
81d882d5 |
SSL_CTX_set_mode(ctx->ctx, SSL_MODE_RELEASE_BUFFERS); |
a6c573d2 |
#endif |
81d882d5 |
SSL_CTX_set_session_cache_mode(ctx->ctx, SSL_SESS_CACHE_OFF);
SSL_CTX_set_default_passwd_cb(ctx->ctx, pem_password_callback); |
b5563f11 |
|
81d882d5 |
/* Require peer certificate verification */ |
b5563f11 |
#if P2MP_SERVER |
81d882d5 |
if (ssl_flags & SSLF_CLIENT_CERT_NOT_REQUIRED) |
b5563f11 |
{ |
81d882d5 |
flags = 0; |
b5563f11 |
} |
81d882d5 |
else if (ssl_flags & SSLF_CLIENT_CERT_OPTIONAL) |
f107c620 |
{ |
81d882d5 |
flags = SSL_VERIFY_PEER; |
f107c620 |
} |
b5563f11 |
#endif |
81d882d5 |
SSL_CTX_set_verify(ctx->ctx, flags, verify_callback); |
b5563f11 |
|
81d882d5 |
SSL_CTX_set_info_callback(ctx->ctx, info_callback); |
0e8a30c0 |
return true; |
b5563f11 |
}
|
397c0a35 |
void |
2e74a9d0 |
tls_ctx_restrict_ciphers(struct tls_root_ctx *ctx, const char *ciphers)
{ |
81d882d5 |
if (ciphers == NULL) |
e83313a8 |
{ |
81d882d5 |
/* Use sane default TLS cipher list */
if (!SSL_CTX_set_cipher_list(ctx->ctx,
/* Use openssl's default list as a basis */
"DEFAULT"
/* Disable export ciphers and openssl's 'low' and 'medium' ciphers */
":!EXP:!LOW:!MEDIUM"
/* Disable static (EC)DH keys (no forward secrecy) */
":!kDH:!kECDH"
/* Disable DSA private keys */
":!DSS"
/* Disable unsupported TLS modes */
":!PSK:!SRP:!kRSA"))
{
crypto_msg(M_FATAL, "Failed to set default TLS cipher list.");
}
return; |
e83313a8 |
}
|
81d882d5 |
/* Parse supplied cipher list and pass on to OpenSSL */
size_t begin_of_cipher, end_of_cipher;
const char *current_cipher;
size_t current_cipher_len; |
3b23b18d |
|
81d882d5 |
const tls_cipher_name_pair *cipher_pair; |
3b23b18d |
|
81d882d5 |
char openssl_ciphers[4096];
size_t openssl_ciphers_len = 0;
openssl_ciphers[0] = '\0'; |
3b23b18d |
|
81d882d5 |
ASSERT(NULL != ctx); |
3b23b18d |
|
81d882d5 |
/* Translate IANA cipher suite names to OpenSSL names */
begin_of_cipher = end_of_cipher = 0; |
4cd4899e |
for (; begin_of_cipher < strlen(ciphers); begin_of_cipher = end_of_cipher)
{ |
81d882d5 |
end_of_cipher += strcspn(&ciphers[begin_of_cipher], ":");
cipher_pair = tls_get_cipher_name_pair(&ciphers[begin_of_cipher], end_of_cipher - begin_of_cipher);
if (NULL == cipher_pair)
{
/* No translation found, use original */
current_cipher = &ciphers[begin_of_cipher];
current_cipher_len = end_of_cipher - begin_of_cipher;
/* Issue warning on missing translation */
/* %.*s format specifier expects length of type int, so guarantee */
/* that length is small enough and cast to int. */
msg(D_LOW, "No valid translation found for TLS cipher '%.*s'",
constrain_int(current_cipher_len, 0, 256), current_cipher);
}
else
{
/* Use OpenSSL name */
current_cipher = cipher_pair->openssl_name;
current_cipher_len = strlen(current_cipher); |
2e74a9d0 |
|
81d882d5 |
if (end_of_cipher - begin_of_cipher == current_cipher_len
&& 0 != memcmp(&ciphers[begin_of_cipher], cipher_pair->iana_name,
end_of_cipher - begin_of_cipher))
{
/* Non-IANA name used, show warning */
msg(M_WARN, "Deprecated TLS cipher name '%s', please use IANA name '%s'", cipher_pair->openssl_name, cipher_pair->iana_name);
}
} |
3b23b18d |
|
81d882d5 |
/* Make sure new cipher name fits in cipher string */ |
e6bf7e03 |
if ((SIZE_MAX - openssl_ciphers_len) < current_cipher_len
|| ((sizeof(openssl_ciphers)-1) < openssl_ciphers_len + current_cipher_len)) |
3b23b18d |
{ |
81d882d5 |
msg(M_FATAL,
"Failed to set restricted TLS cipher list, too long (>%d).",
(int)sizeof(openssl_ciphers)-1); |
3b23b18d |
} |
81d882d5 |
/* Concatenate cipher name to OpenSSL cipher string */
memcpy(&openssl_ciphers[openssl_ciphers_len], current_cipher, current_cipher_len);
openssl_ciphers_len += current_cipher_len;
openssl_ciphers[openssl_ciphers_len] = ':';
openssl_ciphers_len++;
end_of_cipher++;
}
if (openssl_ciphers_len > 0)
{
openssl_ciphers[openssl_ciphers_len-1] = '\0';
}
/* Set OpenSSL cipher list */
if (!SSL_CTX_set_cipher_list(ctx->ctx, openssl_ciphers))
{
crypto_msg(M_FATAL, "Failed to set restricted TLS cipher list: %s", openssl_ciphers);
} |
2e74a9d0 |
}
void |
aba75874 |
tls_ctx_set_cert_profile(struct tls_root_ctx *ctx, const char *profile)
{ |
88a827f2 |
#ifdef HAVE_SSL_CTX_SET_SECURITY_LEVEL |
aba75874 |
/* OpenSSL does not have certificate profiles, but a complex set of
* callbacks that we could try to implement to achieve something similar.
* For now, use OpenSSL's security levels to achieve similar (but not equal)
* behaviour. */
if (!profile || 0 == strcmp(profile, "legacy"))
{
SSL_CTX_set_security_level(ctx->ctx, 1);
}
else if (0 == strcmp(profile, "preferred"))
{
SSL_CTX_set_security_level(ctx->ctx, 2);
}
else if (0 == strcmp(profile, "suiteb"))
{
SSL_CTX_set_security_level(ctx->ctx, 3);
SSL_CTX_set_cipher_list(ctx->ctx, "SUITEB128");
}
else
{
msg(M_FATAL, "ERROR: Invalid cert profile: %s", profile);
}
#else
if (profile)
{
msg(M_WARN, "WARNING: OpenSSL 1.0.1 does not support --tls-cert-profile"
", ignoring user-set profile: '%s'", profile);
}
#endif
}
void |
81d882d5 |
tls_ctx_check_cert_time(const struct tls_root_ctx *ctx) |
091edd8e |
{ |
81d882d5 |
int ret;
const X509 *cert; |
0e591a2f |
|
81d882d5 |
ASSERT(ctx); |
868d9d01 |
|
9dfc2309 |
#if OPENSSL_VERSION_NUMBER >= 0x10002000L && !defined(LIBRESSL_VERSION_NUMBER) |
81d882d5 |
/* OpenSSL 1.0.2 and up */
cert = SSL_CTX_get0_certificate(ctx->ctx); |
0e591a2f |
#else |
81d882d5 |
/* OpenSSL 1.0.1 and earlier need an SSL object to get at the certificate */
SSL *ssl = SSL_new(ctx->ctx);
cert = SSL_get_certificate(ssl); |
0e591a2f |
#endif |
091edd8e |
|
81d882d5 |
if (cert == NULL) |
868d9d01 |
{ |
81d882d5 |
goto cleanup; /* Nothing to check if there is no certificate */ |
868d9d01 |
}
|
81d882d5 |
ret = X509_cmp_time(X509_get_notBefore(cert), NULL);
if (ret == 0) |
091edd8e |
{ |
81d882d5 |
msg(D_TLS_DEBUG_MED, "Failed to read certificate notBefore field."); |
091edd8e |
} |
81d882d5 |
if (ret > 0) |
091edd8e |
{ |
81d882d5 |
msg(M_WARN, "WARNING: Your certificate is not yet valid!"); |
091edd8e |
}
|
81d882d5 |
ret = X509_cmp_time(X509_get_notAfter(cert), NULL);
if (ret == 0) |
091edd8e |
{ |
81d882d5 |
msg(D_TLS_DEBUG_MED, "Failed to read certificate notAfter field."); |
091edd8e |
} |
81d882d5 |
if (ret < 0) |
091edd8e |
{ |
81d882d5 |
msg(M_WARN, "WARNING: Your certificate has expired!"); |
091edd8e |
} |
868d9d01 |
cleanup: |
9dfc2309 |
#if OPENSSL_VERSION_NUMBER < 0x10002000L || defined(LIBRESSL_VERSION_NUMBER) |
81d882d5 |
SSL_free(ssl); |
644f2cdd |
#endif |
81d882d5 |
return; |
091edd8e |
}
void |
81d882d5 |
tls_ctx_load_dh_params(struct tls_root_ctx *ctx, const char *dh_file,
const char *dh_file_inline
) |
ac3e8d62 |
{ |
81d882d5 |
DH *dh;
BIO *bio; |
ac3e8d62 |
|
81d882d5 |
ASSERT(NULL != ctx); |
ac3e8d62 |
|
81d882d5 |
if (!strcmp(dh_file, INLINE_FILE_TAG) && dh_file_inline) |
ac3e8d62 |
{ |
81d882d5 |
if (!(bio = BIO_new_mem_buf((char *)dh_file_inline, -1)))
{
crypto_msg(M_FATAL, "Cannot open memory BIO for inline DH parameters");
} |
ac3e8d62 |
} |
81d882d5 |
else |
ac3e8d62 |
{ |
81d882d5 |
/* Get Diffie Hellman Parameters */
if (!(bio = BIO_new_file(dh_file, "r")))
{
crypto_msg(M_FATAL, "Cannot open %s for DH parameters", dh_file);
} |
ac3e8d62 |
}
|
81d882d5 |
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
BIO_free(bio); |
ac3e8d62 |
|
81d882d5 |
if (!dh)
{
crypto_msg(M_FATAL, "Cannot load DH parameters from %s", dh_file);
}
if (!SSL_CTX_set_tmp_dh(ctx->ctx, dh))
{
crypto_msg(M_FATAL, "SSL_CTX_set_tmp_dh");
} |
ac3e8d62 |
|
81d882d5 |
msg(D_TLS_DEBUG_LOW, "Diffie-Hellman initialized with %d bit key",
8 * DH_size(dh)); |
ac3e8d62 |
|
81d882d5 |
DH_free(dh); |
ac3e8d62 |
}
|
609e8131 |
void |
81d882d5 |
tls_ctx_load_ecdh_params(struct tls_root_ctx *ctx, const char *curve_name
) |
609e8131 |
{
#ifndef OPENSSL_NO_EC |
81d882d5 |
int nid = NID_undef;
EC_KEY *ecdh = NULL;
const char *sname = NULL; |
609e8131 |
|
81d882d5 |
/* Generate a new ECDH key for each SSL session (for non-ephemeral ECDH) */
SSL_CTX_set_options(ctx->ctx, SSL_OP_SINGLE_ECDH_USE); |
5b004f99 |
|
81d882d5 |
if (curve_name != NULL) |
609e8131 |
{ |
81d882d5 |
/* Use user supplied curve if given */
msg(D_TLS_DEBUG, "Using user specified ECDH curve (%s)", curve_name);
nid = OBJ_sn2nid(curve_name); |
609e8131 |
} |
81d882d5 |
else |
609e8131 |
{ |
5b004f99 |
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
/* OpenSSL 1.0.2 and newer can automatically handle ECDH parameter
* loading */
SSL_CTX_set_ecdh_auto(ctx->ctx, 1);
return;
#else
/* For older OpenSSL we have to extract the curve from key on our own */ |
81d882d5 |
EC_KEY *eckey = NULL;
const EC_GROUP *ecgrp = NULL;
EVP_PKEY *pkey = NULL; |
609e8131 |
|
81d882d5 |
/* Little hack to get private key ref from SSL_CTX, yay OpenSSL... */ |
dcfd3b61 |
SSL *ssl = SSL_new(ctx->ctx);
if (!ssl)
{
crypto_msg(M_FATAL, "SSL_new failed");
}
pkey = SSL_get_privatekey(ssl);
SSL_free(ssl); |
609e8131 |
|
81d882d5 |
msg(D_TLS_DEBUG, "Extracting ECDH curve from private key"); |
609e8131 |
|
81d882d5 |
if (pkey != NULL && (eckey = EVP_PKEY_get1_EC_KEY(pkey)) != NULL
&& (ecgrp = EC_KEY_get0_group(eckey)) != NULL)
{
nid = EC_GROUP_get_curve_name(ecgrp);
} |
5b004f99 |
#endif |
609e8131 |
}
|
81d882d5 |
/* Translate NID back to name , just for kicks */
sname = OBJ_nid2sn(nid);
if (sname == NULL)
{
sname = "(Unknown)";
} |
609e8131 |
|
81d882d5 |
/* Create new EC key and set as ECDH key */
if (NID_undef == nid || NULL == (ecdh = EC_KEY_new_by_curve_name(nid))) |
609e8131 |
{ |
81d882d5 |
/* Creating key failed, fall back on sane default */
ecdh = EC_KEY_new_by_curve_name(NID_secp384r1);
const char *source = (NULL == curve_name) ?
"extract curve from certificate" : "use supplied curve";
msg(D_TLS_DEBUG_LOW,
"Failed to %s (%s), using secp384r1 instead.", source, sname);
sname = OBJ_nid2sn(NID_secp384r1); |
609e8131 |
}
|
81d882d5 |
if (!SSL_CTX_set_tmp_ecdh(ctx->ctx, ecdh))
{
crypto_msg(M_FATAL, "SSL_CTX_set_tmp_ecdh: cannot add curve");
} |
609e8131 |
|
81d882d5 |
msg(D_TLS_DEBUG_LOW, "ECDH curve %s added", sname); |
609e8131 |
|
81d882d5 |
EC_KEY_free(ecdh);
#else /* ifndef OPENSSL_NO_EC */
msg(M_DEBUG, "Your OpenSSL library was built without elliptic curve support."
" Skipping ECDH parameter loading."); |
609e8131 |
#endif /* OPENSSL_NO_EC */
}
|
289a8bb8 |
int
tls_ctx_load_pkcs12(struct tls_root_ctx *ctx, const char *pkcs12_file, |
81d882d5 |
const char *pkcs12_file_inline,
bool load_ca_file
) |
289a8bb8 |
{ |
81d882d5 |
FILE *fp;
EVP_PKEY *pkey;
X509 *cert;
STACK_OF(X509) *ca = NULL;
PKCS12 *p12;
int i;
char password[256];
ASSERT(NULL != ctx);
if (!strcmp(pkcs12_file, INLINE_FILE_TAG) && pkcs12_file_inline)
{
BIO *b64 = BIO_new(BIO_f_base64());
BIO *bio = BIO_new_mem_buf((void *) pkcs12_file_inline,
(int) strlen(pkcs12_file_inline));
ASSERT(b64 && bio);
BIO_push(b64, bio);
p12 = d2i_PKCS12_bio(b64, NULL);
if (!p12)
{
crypto_msg(M_FATAL, "Error reading inline PKCS#12 file");
}
BIO_free(b64);
BIO_free(bio);
}
else
{
/* Load the PKCS #12 file */
if (!(fp = platform_fopen(pkcs12_file, "rb")))
{
crypto_msg(M_FATAL, "Error opening file %s", pkcs12_file);
}
p12 = d2i_PKCS12_fp(fp, NULL);
fclose(fp);
if (!p12)
{
crypto_msg(M_FATAL, "Error reading PKCS#12 file %s", pkcs12_file);
}
}
/* Parse the PKCS #12 file */
if (!PKCS12_parse(p12, "", &pkey, &cert, &ca))
{
pem_password_callback(password, sizeof(password) - 1, 0, NULL);
/* Reparse the PKCS #12 file with password */
ca = NULL;
if (!PKCS12_parse(p12, password, &pkey, &cert, &ca))
{ |
289a8bb8 |
#ifdef ENABLE_MANAGEMENT |
81d882d5 |
if (management && (ERR_GET_REASON(ERR_peek_error()) == PKCS12_R_MAC_VERIFY_FAILURE))
{
management_auth_failure(management, UP_TYPE_PRIVATE_KEY, NULL);
} |
289a8bb8 |
#endif |
81d882d5 |
PKCS12_free(p12);
return 1;
}
}
PKCS12_free(p12);
/* Load Certificate */
if (!SSL_CTX_use_certificate(ctx->ctx, cert))
{
crypto_msg(M_FATAL, "Cannot use certificate");
}
/* Load Private Key */
if (!SSL_CTX_use_PrivateKey(ctx->ctx, pkey))
{
crypto_msg(M_FATAL, "Cannot use private key");
}
/* Check Private Key */
if (!SSL_CTX_check_private_key(ctx->ctx))
{
crypto_msg(M_FATAL, "Private key does not match the certificate");
}
/* Set Certificate Verification chain */
if (load_ca_file)
{
/* Add CAs from PKCS12 to the cert store and mark them as trusted.
* They're also used to fill in the chain of intermediate certs as
* necessary.
*/
if (ca && sk_X509_num(ca))
{
for (i = 0; i < sk_X509_num(ca); i++)
{ |
6554ac9f |
X509_STORE *cert_store = SSL_CTX_get_cert_store(ctx->ctx);
if (!X509_STORE_add_cert(cert_store,sk_X509_value(ca, i))) |
81d882d5 |
{
crypto_msg(M_FATAL,"Cannot add certificate to certificate chain (X509_STORE_add_cert)");
}
if (!SSL_CTX_add_client_CA(ctx->ctx, sk_X509_value(ca, i)))
{
crypto_msg(M_FATAL,"Cannot add certificate to client CA list (SSL_CTX_add_client_CA)");
}
}
}
}
else
{
/* If trusted CA certs were loaded from a PEM file, and we ignore the
* ones in PKCS12, do load PKCS12-provided certs to the client extra
* certs chain just in case they include intermediate CAs needed to
* prove my identity to the other end. This does not make them trusted.
*/
if (ca && sk_X509_num(ca))
{
for (i = 0; i < sk_X509_num(ca); i++)
{
if (!SSL_CTX_add_extra_chain_cert(ctx->ctx,sk_X509_value(ca, i)))
{
crypto_msg(M_FATAL, "Cannot add extra certificate to chain (SSL_CTX_add_extra_chain_cert)");
}
}
}
}
return 0; |
289a8bb8 |
}
|
93c22ecc |
#ifdef ENABLE_CRYPTOAPI |
d494c315 |
void
tls_ctx_load_cryptoapi(struct tls_root_ctx *ctx, const char *cryptoapi_cert)
{ |
81d882d5 |
ASSERT(NULL != ctx); |
d494c315 |
|
81d882d5 |
/* Load Certificate and Private Key */
if (!SSL_CTX_use_CryptoAPI_certificate(ctx->ctx, cryptoapi_cert))
{
crypto_msg(M_FATAL, "Cannot load certificate \"%s\" from Microsoft Certificate Store", cryptoapi_cert);
} |
d494c315 |
} |
445b192a |
#endif /* ENABLE_CRYPTOAPI */ |
d494c315 |
|
71bbbd76 |
static void |
81d882d5 |
tls_ctx_add_extra_certs(struct tls_root_ctx *ctx, BIO *bio) |
f4047d74 |
{ |
81d882d5 |
X509 *cert;
for (;; ) |
f4047d74 |
{ |
81d882d5 |
cert = NULL; |
280150a0 |
if (!PEM_read_bio_X509(bio, &cert, NULL, NULL)) /* takes ownership of cert */ |
81d882d5 |
{
break;
}
if (!cert)
{
crypto_msg(M_FATAL, "Error reading extra certificate");
}
if (SSL_CTX_add_extra_chain_cert(ctx->ctx, cert) != 1)
{
crypto_msg(M_FATAL, "Error adding extra certificate");
} |
f4047d74 |
}
}
|
c3b2d487 |
/* Like tls_ctx_load_cert, but returns a copy of the certificate in **X509 */
static void |
81d882d5 |
tls_ctx_load_cert_file_and_copy(struct tls_root_ctx *ctx,
const char *cert_file, const char *cert_file_inline, X509 **x509
) |
f4047d74 |
{ |
81d882d5 |
BIO *in = NULL;
X509 *x = NULL;
int ret = 0;
bool inline_file = false; |
71bbbd76 |
|
81d882d5 |
ASSERT(NULL != ctx);
if (NULL != x509)
{
ASSERT(NULL == *x509);
} |
f4047d74 |
|
81d882d5 |
inline_file = (strcmp(cert_file, INLINE_FILE_TAG) == 0); |
f4047d74 |
|
81d882d5 |
if (inline_file && cert_file_inline)
{
in = BIO_new_mem_buf((char *)cert_file_inline, -1);
}
else
{
in = BIO_new_file(cert_file, "r");
} |
71bbbd76 |
|
81d882d5 |
if (in == NULL) |
71bbbd76 |
{ |
81d882d5 |
SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE, ERR_R_SYS_LIB);
goto end; |
71bbbd76 |
}
|
6554ac9f |
x = PEM_read_bio_X509(in, NULL,
SSL_CTX_get_default_passwd_cb(ctx->ctx),
SSL_CTX_get_default_passwd_cb_userdata(ctx->ctx)); |
81d882d5 |
if (x == NULL) |
f4047d74 |
{ |
81d882d5 |
SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE, ERR_R_PEM_LIB);
goto end; |
71bbbd76 |
}
|
81d882d5 |
ret = SSL_CTX_use_certificate(ctx->ctx, x);
if (ret)
{
tls_ctx_add_extra_certs(ctx, in);
} |
71bbbd76 |
end: |
81d882d5 |
if (!ret) |
71bbbd76 |
{ |
81d882d5 |
if (inline_file)
{
crypto_msg(M_FATAL, "Cannot load inline certificate file");
}
else
{
crypto_msg(M_FATAL, "Cannot load certificate file %s", cert_file);
} |
f4047d74 |
} |
71bbbd76 |
|
81d882d5 |
if (in != NULL)
{
BIO_free(in);
}
if (x509)
{
*x509 = x;
}
else if (x)
{
X509_free(x);
} |
f4047d74 |
}
|
47712706 |
void |
81d882d5 |
tls_ctx_load_cert_file(struct tls_root_ctx *ctx, const char *cert_file,
const char *cert_file_inline) |
c3b2d487 |
{ |
81d882d5 |
tls_ctx_load_cert_file_and_copy(ctx, cert_file, cert_file_inline, NULL); |
c3b2d487 |
}
|
d67c3147 |
int |
81d882d5 |
tls_ctx_load_priv_file(struct tls_root_ctx *ctx, const char *priv_key_file,
const char *priv_key_file_inline
) |
d67c3147 |
{ |
81d882d5 |
SSL_CTX *ssl_ctx = NULL;
BIO *in = NULL;
EVP_PKEY *pkey = NULL;
int ret = 1; |
d67c3147 |
|
81d882d5 |
ASSERT(NULL != ctx); |
be960aad |
|
81d882d5 |
ssl_ctx = ctx->ctx; |
71bbbd76 |
|
81d882d5 |
if (!strcmp(priv_key_file, INLINE_FILE_TAG) && priv_key_file_inline)
{
in = BIO_new_mem_buf((char *)priv_key_file_inline, -1);
}
else
{
in = BIO_new_file(priv_key_file, "r");
} |
71bbbd76 |
|
81d882d5 |
if (!in)
{
goto end;
} |
71bbbd76 |
|
81d882d5 |
pkey = PEM_read_bio_PrivateKey(in, NULL, |
6554ac9f |
SSL_CTX_get_default_passwd_cb(ctx->ctx),
SSL_CTX_get_default_passwd_cb_userdata(ctx->ctx)); |
81d882d5 |
if (!pkey)
{
goto end;
} |
71bbbd76 |
|
81d882d5 |
if (!SSL_CTX_use_PrivateKey(ssl_ctx, pkey)) |
d67c3147 |
{
#ifdef ENABLE_MANAGEMENT |
81d882d5 |
if (management && (ERR_GET_REASON(ERR_peek_error()) == EVP_R_BAD_DECRYPT))
{
management_auth_failure(management, UP_TYPE_PRIVATE_KEY, NULL);
} |
d67c3147 |
#endif |
81d882d5 |
crypto_msg(M_WARN, "Cannot load private key file %s", priv_key_file);
goto end; |
d67c3147 |
}
|
81d882d5 |
/* Check Private Key */
if (!SSL_CTX_check_private_key(ssl_ctx))
{
crypto_msg(M_FATAL, "Private key does not match the certificate");
}
ret = 0; |
d67c3147 |
|
71bbbd76 |
end: |
81d882d5 |
if (pkey)
{
EVP_PKEY_free(pkey);
}
if (in)
{
BIO_free(in);
}
return ret; |
d67c3147 |
}
|
160504a2 |
void |
ce91c187 |
backend_tls_ctx_reload_crl(struct tls_root_ctx *ssl_ctx, const char *crl_file, |
81d882d5 |
const char *crl_inline) |
160504a2 |
{ |
81d882d5 |
X509_CRL *crl = NULL;
BIO *in = NULL; |
160504a2 |
|
81d882d5 |
X509_STORE *store = SSL_CTX_get_cert_store(ssl_ctx->ctx);
if (!store)
{
crypto_msg(M_FATAL, "Cannot get certificate store");
} |
160504a2 |
|
81d882d5 |
/* Always start with a cleared CRL list, for that we
* we need to manually find the CRL object from the stack
* and remove it */ |
f05665df |
STACK_OF(X509_OBJECT) *objs = X509_STORE_get0_objects(store);
for (int i = 0; i < sk_X509_OBJECT_num(objs); i++) |
160504a2 |
{ |
f05665df |
X509_OBJECT *obj = sk_X509_OBJECT_value(objs, i); |
81d882d5 |
ASSERT(obj); |
47191f49 |
if (X509_OBJECT_get_type(obj) == X509_LU_CRL) |
81d882d5 |
{ |
f05665df |
sk_X509_OBJECT_delete(objs, i); |
47191f49 |
X509_OBJECT_free(obj); |
81d882d5 |
} |
160504a2 |
}
|
81d882d5 |
X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL); |
160504a2 |
|
81d882d5 |
if (!strcmp(crl_file, INLINE_FILE_TAG) && crl_inline)
{
in = BIO_new_mem_buf((char *)crl_inline, -1);
}
else
{
in = BIO_new_file(crl_file, "r");
} |
160504a2 |
|
81d882d5 |
if (in == NULL) |
160504a2 |
{ |
81d882d5 |
msg(M_WARN, "CRL: cannot read: %s", crl_file);
goto end; |
160504a2 |
}
|
81d882d5 |
crl = PEM_read_bio_X509_CRL(in, NULL, NULL, NULL);
if (crl == NULL) |
160504a2 |
{ |
81d882d5 |
msg(M_WARN, "CRL: cannot read CRL from file %s", crl_file);
goto end; |
160504a2 |
}
|
81d882d5 |
if (!X509_STORE_add_crl(store, crl)) |
160504a2 |
{ |
81d882d5 |
msg(M_WARN, "CRL: cannot add %s to store", crl_file);
goto end; |
160504a2 |
}
end: |
81d882d5 |
X509_CRL_free(crl);
BIO_free(in); |
160504a2 |
}
|
5f4eb537 |
#ifdef MANAGMENT_EXTERNAL_KEY
/* encrypt */
static int
rsa_pub_enc(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding)
{ |
81d882d5 |
ASSERT(0);
return -1; |
5f4eb537 |
}
/* verify arbitrary data */
static int
rsa_pub_dec(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding)
{ |
81d882d5 |
ASSERT(0);
return -1; |
5f4eb537 |
}
/* decrypt */
static int
rsa_priv_dec(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding)
{ |
81d882d5 |
ASSERT(0);
return -1; |
5f4eb537 |
}
/* called at RSA_free */
static int |
f7780af6 |
openvpn_extkey_rsa_finish(RSA *rsa) |
5f4eb537 |
{ |
f7780af6 |
/* meth was allocated in tls_ctx_use_external_private_key() ; since
* this function is called when the parent RSA object is destroyed,
* it is no longer used after this point so kill it. */
const RSA_METHOD *meth = RSA_get_method(rsa);
RSA_meth_free((RSA_METHOD *)meth); |
81d882d5 |
return 1; |
5f4eb537 |
}
/* sign arbitrary data */
static int
rsa_priv_enc(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding)
{ |
81d882d5 |
/* optional app data in rsa->meth->app_data; */
char *in_b64 = NULL;
char *out_b64 = NULL;
int ret = -1;
int len; |
5f4eb537 |
|
81d882d5 |
if (padding != RSA_PKCS1_PADDING)
{ |
c828ffc6 |
RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, RSA_R_UNKNOWN_PADDING_TYPE); |
81d882d5 |
goto done;
} |
5f4eb537 |
|
81d882d5 |
/* convert 'from' to base64 */
if (openvpn_base64_encode(from, flen, &in_b64) <= 0)
{
goto done;
} |
5f4eb537 |
|
81d882d5 |
/* call MI for signature */
if (management)
{
out_b64 = management_query_rsa_sig(management, in_b64);
}
if (!out_b64)
{
goto done;
} |
c3b2d487 |
|
81d882d5 |
/* decode base64 signature to binary */
len = RSA_size(rsa);
ret = openvpn_base64_decode(out_b64, to, len); |
68793f40 |
|
81d882d5 |
/* verify length */
if (ret != len)
{
ret = -1;
} |
5f4eb537 |
|
81d882d5 |
done:
if (in_b64) |
5f4eb537 |
{ |
81d882d5 |
free(in_b64); |
5f4eb537 |
} |
81d882d5 |
if (out_b64)
{
free(out_b64);
}
return ret;
} |
5f4eb537 |
|
81d882d5 |
int
tls_ctx_use_external_private_key(struct tls_root_ctx *ctx,
const char *cert_file, const char *cert_file_inline)
{
RSA *rsa = NULL;
RSA *pub_rsa;
RSA_METHOD *rsa_meth;
X509 *cert = NULL;
ASSERT(NULL != ctx);
tls_ctx_load_cert_file_and_copy(ctx, cert_file, cert_file_inline, &cert);
ASSERT(NULL != cert);
/* allocate custom RSA method object */ |
09776c5b |
rsa_meth = RSA_meth_new("OpenVPN external private key RSA Method",
RSA_METHOD_FLAG_NO_CHECK);
check_malloc_return(rsa_meth);
RSA_meth_set_pub_enc(rsa_meth, rsa_pub_enc);
RSA_meth_set_pub_dec(rsa_meth, rsa_pub_dec);
RSA_meth_set_priv_enc(rsa_meth, rsa_priv_enc);
RSA_meth_set_priv_dec(rsa_meth, rsa_priv_dec);
RSA_meth_set_init(rsa_meth, NULL); |
f7780af6 |
RSA_meth_set_finish(rsa_meth, openvpn_extkey_rsa_finish); |
09776c5b |
RSA_meth_set0_app_data(rsa_meth, NULL); |
81d882d5 |
/* allocate RSA object */
rsa = RSA_new();
if (rsa == NULL)
{
SSLerr(SSL_F_SSL_USE_PRIVATEKEY, ERR_R_MALLOC_FAILURE);
goto err;
} |
5f4eb537 |
|
81d882d5 |
/* get the public key */ |
17d1ab90 |
EVP_PKEY *pkey = X509_get0_pubkey(cert);
ASSERT(pkey); /* NULL before SSL_CTX_use_certificate() is called */ |
b8ca5bc3 |
pub_rsa = EVP_PKEY_get0_RSA(pkey); |
5f4eb537 |
|
bb23eca8 |
/* Certificate might not be RSA but DSA or EC */
if (!pub_rsa)
{
crypto_msg(M_WARN, "management-external-key requires a RSA certificate");
goto err;
}
|
81d882d5 |
/* initialize RSA object */ |
f7780af6 |
const BIGNUM *n = NULL;
const BIGNUM *e = NULL;
RSA_get0_key(pub_rsa, &n, &e, NULL);
RSA_set0_key(rsa, BN_dup(n), BN_dup(e), NULL);
RSA_set_flags(rsa, RSA_flags(rsa) | RSA_FLAG_EXT_PKEY); |
81d882d5 |
if (!RSA_set_method(rsa, rsa_meth))
{
goto err;
} |
5f4eb537 |
|
81d882d5 |
/* bind our custom RSA object to ssl_ctx */
if (!SSL_CTX_use_RSAPrivateKey(ctx->ctx, rsa))
{
goto err;
} |
5f4eb537 |
|
c3b2d487 |
X509_free(cert); |
81d882d5 |
RSA_free(rsa); /* doesn't necessarily free, just decrements refcount */
return 1;
err:
if (cert)
{
X509_free(cert);
}
if (rsa)
{
RSA_free(rsa);
}
else |
5f4eb537 |
{ |
81d882d5 |
if (rsa_meth)
{ |
508741c1 |
RSA_meth_free(rsa_meth); |
81d882d5 |
} |
5f4eb537 |
} |
81d882d5 |
crypto_msg(M_FATAL, "Cannot enable SSL external private key capability");
return 0; |
5f4eb537 |
}
|
81d882d5 |
#endif /* ifdef MANAGMENT_EXTERNAL_KEY */ |
5f4eb537 |
|
244da317 |
static int |
81d882d5 |
sk_x509_name_cmp(const X509_NAME *const *a, const X509_NAME *const *b) |
244da317 |
{ |
81d882d5 |
return X509_NAME_cmp(*a, *b); |
244da317 |
}
void |
81d882d5 |
tls_ctx_load_ca(struct tls_root_ctx *ctx, const char *ca_file,
const char *ca_file_inline,
const char *ca_path, bool tls_server
) |
244da317 |
{ |
81d882d5 |
STACK_OF(X509_INFO) *info_stack = NULL;
STACK_OF(X509_NAME) *cert_names = NULL;
X509_LOOKUP *lookup = NULL;
X509_STORE *store = NULL;
X509_NAME *xn = NULL;
BIO *in = NULL;
int i, added = 0, prev = 0;
ASSERT(NULL != ctx);
store = SSL_CTX_get_cert_store(ctx->ctx);
if (!store)
{
crypto_msg(M_FATAL, "Cannot get certificate store");
} |
71bbbd76 |
|
81d882d5 |
/* Try to add certificates and CRLs from ca_file */
if (ca_file) |
71bbbd76 |
{ |
81d882d5 |
if (!strcmp(ca_file, INLINE_FILE_TAG) && ca_file_inline)
{
in = BIO_new_mem_buf((char *)ca_file_inline, -1);
}
else
{
in = BIO_new_file(ca_file, "r");
} |
244da317 |
|
81d882d5 |
if (in)
{
info_stack = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL);
} |
71bbbd76 |
|
81d882d5 |
if (info_stack) |
71bbbd76 |
{ |
81d882d5 |
for (i = 0; i < sk_X509_INFO_num(info_stack); i++) |
71bbbd76 |
{ |
81d882d5 |
X509_INFO *info = sk_X509_INFO_value(info_stack, i);
if (info->crl) |
9927cdbd |
{ |
81d882d5 |
X509_STORE_add_crl(store, info->crl); |
9927cdbd |
}
|
81d882d5 |
if (tls_server && !info->x509) |
71bbbd76 |
{ |
81d882d5 |
crypto_msg(M_FATAL, "X509 name was missing in TLS mode");
} |
71bbbd76 |
|
81d882d5 |
if (info->x509)
{
X509_STORE_add_cert(store, info->x509);
added++; |
71bbbd76 |
|
81d882d5 |
if (!tls_server) |
71bbbd76 |
{
continue;
}
|
81d882d5 |
/* Use names of CAs as a client CA list */
if (cert_names == NULL)
{
cert_names = sk_X509_NAME_new(sk_x509_name_cmp);
if (!cert_names)
{
continue;
}
} |
71bbbd76 |
|
81d882d5 |
xn = X509_get_subject_name(info->x509);
if (!xn) |
71bbbd76 |
{
continue; |
81d882d5 |
}
/* Don't add duplicate CA names */
if (sk_X509_NAME_find(cert_names, xn) == -1)
{
xn = X509_NAME_dup(xn);
if (!xn)
{
continue;
}
sk_X509_NAME_push(cert_names, xn); |
71bbbd76 |
}
} |
9927cdbd |
|
81d882d5 |
if (tls_server)
{
int cnum = sk_X509_NAME_num(cert_names);
if (cnum != (prev + 1))
{
crypto_msg(M_WARN,
"Cannot load CA certificate file %s (entry %d did not validate)",
np(ca_file), added);
}
prev = cnum;
} |
9927cdbd |
|
71bbbd76 |
} |
81d882d5 |
sk_X509_INFO_pop_free(info_stack, X509_INFO_free); |
71bbbd76 |
}
|
81d882d5 |
if (tls_server)
{
SSL_CTX_set_client_CA_list(ctx->ctx, cert_names);
} |
71bbbd76 |
|
81d882d5 |
if (!added)
{
crypto_msg(M_FATAL,
"Cannot load CA certificate file %s (no entries were read)",
np(ca_file));
} |
9927cdbd |
|
81d882d5 |
if (tls_server)
{
int cnum = sk_X509_NAME_num(cert_names);
if (cnum != added)
{
crypto_msg(M_FATAL, "Cannot load CA certificate file %s (only %d "
"of %d entries were valid X509 names)",
np(ca_file), cnum, added);
}
} |
9927cdbd |
|
81d882d5 |
if (in)
{
BIO_free(in);
} |
71bbbd76 |
} |
244da317 |
|
81d882d5 |
/* Set a store for certs (CA & CRL) with a lookup on the "capath" hash directory */
if (ca_path) |
71bbbd76 |
{ |
81d882d5 |
lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir());
if (lookup && X509_LOOKUP_add_dir(lookup, ca_path, X509_FILETYPE_PEM))
{
msg(M_WARN, "WARNING: experimental option --capath %s", ca_path);
}
else
{
crypto_msg(M_FATAL, "Cannot add lookup at --capath %s", ca_path);
}
X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL); |
71bbbd76 |
} |
fceecbab |
}
void |
81d882d5 |
tls_ctx_load_extra_certs(struct tls_root_ctx *ctx, const char *extra_certs_file,
const char *extra_certs_file_inline
) |
fceecbab |
{ |
81d882d5 |
BIO *in;
if (!strcmp(extra_certs_file, INLINE_FILE_TAG) && extra_certs_file_inline)
{
in = BIO_new_mem_buf((char *)extra_certs_file_inline, -1);
}
else
{
in = BIO_new_file(extra_certs_file, "r");
}
if (in == NULL)
{
crypto_msg(M_FATAL, "Cannot load extra-certs file: %s", extra_certs_file);
}
else
{
tls_ctx_add_extra_certs(ctx, in);
}
BIO_free(in); |
244da317 |
}
|
d7efe640 |
/* **************************************
*
* Key-state specific functions
*
***************************************/
/*
*
* BIO functions
*
*/
|
dea110e0 |
#ifdef BIO_DEBUG
#warning BIO_DEBUG defined
static FILE *biofp; /* GLOBAL */
static bool biofp_toggle; /* GLOBAL */
static time_t biofp_last_open; /* GLOBAL */
static const int biofp_reopen_interval = 600; /* GLOBAL */
static void |
e2a0cad4 |
close_biofp(void) |
dea110e0 |
{ |
81d882d5 |
if (biofp) |
dea110e0 |
{ |
81d882d5 |
ASSERT(!fclose(biofp));
biofp = NULL; |
dea110e0 |
}
}
static void |
e2a0cad4 |
open_biofp(void) |
dea110e0 |
{ |
81d882d5 |
const time_t current = time(NULL);
const pid_t pid = getpid(); |
dea110e0 |
|
81d882d5 |
if (biofp_last_open + biofp_reopen_interval < current)
{
close_biofp();
}
if (!biofp) |
dea110e0 |
{ |
81d882d5 |
char fn[256];
openvpn_snprintf(fn, sizeof(fn), "bio/%d-%d.log", pid, biofp_toggle);
biofp = fopen(fn, "w");
ASSERT(biofp);
biofp_last_open = time(NULL);
biofp_toggle ^= 1; |
dea110e0 |
}
}
static void |
81d882d5 |
bio_debug_data(const char *mode, BIO *bio, const uint8_t *buf, int len, const char *desc) |
dea110e0 |
{ |
81d882d5 |
struct gc_arena gc = gc_new();
if (len > 0) |
dea110e0 |
{ |
81d882d5 |
open_biofp(); |
31b5c0e9 |
fprintf(biofp, "BIO_%s %s time=%lld bio=" ptr_format " len=%d data=%s\n",
mode, desc, (long long)time(NULL), (ptr_type)bio, len, format_hex(buf, len, 0, &gc)); |
81d882d5 |
fflush(biofp); |
dea110e0 |
} |
81d882d5 |
gc_free(&gc); |
dea110e0 |
}
static void |
81d882d5 |
bio_debug_oc(const char *mode, BIO *bio) |
dea110e0 |
{ |
81d882d5 |
open_biofp(); |
31b5c0e9 |
fprintf(biofp, "BIO %s time=%lld bio=" ptr_format "\n",
mode, (long long)time(NULL), (ptr_type)bio); |
81d882d5 |
fflush(biofp); |
dea110e0 |
}
|
81d882d5 |
#endif /* ifdef BIO_DEBUG */ |
dea110e0 |
|
d7efe640 |
/* |
bf707bd2 |
* Write to an OpenSSL BIO in non-blocking mode.
*/
static int |
81d882d5 |
bio_write(BIO *bio, const uint8_t *data, int size, const char *desc) |
bf707bd2 |
{ |
81d882d5 |
int i;
int ret = 0;
ASSERT(size >= 0);
if (size)
{
/*
* Free the L_TLS lock prior to calling BIO routines
* so that foreground thread can still call
* tls_pre_decrypt or tls_pre_encrypt,
* allowing tunnel packet forwarding to continue.
*/ |
bf707bd2 |
#ifdef BIO_DEBUG |
81d882d5 |
bio_debug_data("write", bio, data, size, desc); |
bf707bd2 |
#endif |
81d882d5 |
i = BIO_write(bio, data, size);
if (i < 0)
{
if (BIO_should_retry(bio))
{
}
else
{
crypto_msg(D_TLS_ERRORS, "TLS ERROR: BIO write %s error", desc);
ret = -1;
ERR_clear_error();
}
}
else if (i != size)
{
crypto_msg(D_TLS_ERRORS, "TLS ERROR: BIO write %s incomplete %d/%d",
desc, i, size);
ret = -1;
ERR_clear_error();
}
else
{ /* successful write */
dmsg(D_HANDSHAKE_VERBOSE, "BIO write %s %d bytes", desc, i);
ret = 1;
}
}
return ret; |
bf707bd2 |
}
/*
* Inline functions for reading from and writing
* to BIOs.
*/
static void |
81d882d5 |
bio_write_post(const int status, struct buffer *buf) |
bf707bd2 |
{ |
81d882d5 |
if (status == 1) /* success status return from bio_write? */ |
bf707bd2 |
{ |
81d882d5 |
memset(BPTR(buf), 0, BLEN(buf)); /* erase data just written */
buf->len = 0; |
bf707bd2 |
}
}
/* |
dd5e1102 |
* Read from an OpenSSL BIO in non-blocking mode.
*/
static int |
81d882d5 |
bio_read(BIO *bio, struct buffer *buf, int maxlen, const char *desc) |
dd5e1102 |
{ |
81d882d5 |
int i;
int ret = 0;
ASSERT(buf->len >= 0);
if (buf->len) |
dd5e1102 |
{
} |
81d882d5 |
else |
dd5e1102 |
{ |
81d882d5 |
int len = buf_forward_capacity(buf);
if (maxlen < len)
{
len = maxlen;
} |
dd5e1102 |
|
81d882d5 |
/*
* BIO_read brackets most of the serious RSA
* key negotiation number crunching.
*/
i = BIO_read(bio, BPTR(buf), len); |
dd5e1102 |
|
81d882d5 |
VALGRIND_MAKE_READABLE((void *) &i, sizeof(i)); |
dd5e1102 |
#ifdef BIO_DEBUG |
81d882d5 |
bio_debug_data("read", bio, BPTR(buf), i, desc); |
dd5e1102 |
#endif |
81d882d5 |
if (i < 0)
{
if (BIO_should_retry(bio))
{
}
else
{
crypto_msg(D_TLS_ERRORS, "TLS_ERROR: BIO read %s error", desc);
buf->len = 0;
ret = -1;
ERR_clear_error();
}
}
else if (!i)
{
buf->len = 0;
}
else
{ /* successful read */
dmsg(D_HANDSHAKE_VERBOSE, "BIO read %s %d bytes", desc, i);
buf->len = i;
ret = 1;
VALGRIND_MAKE_READABLE((void *) BPTR(buf), BLEN(buf));
}
}
return ret; |
dd5e1102 |
}
|
d7efe640 |
void |
b97e2c3c |
key_state_ssl_init(struct key_state_ssl *ks_ssl, const struct tls_root_ctx *ssl_ctx, bool is_server, struct tls_session *session) |
d7efe640 |
{ |
81d882d5 |
ASSERT(NULL != ssl_ctx);
ASSERT(ks_ssl);
CLEAR(*ks_ssl); |
d7efe640 |
|
81d882d5 |
ks_ssl->ssl = SSL_new(ssl_ctx->ctx);
if (!ks_ssl->ssl)
{
crypto_msg(M_FATAL, "SSL_new failed");
} |
d7efe640 |
|
81d882d5 |
/* put session * in ssl object so we can access it
* from verify callback*/
SSL_set_ex_data(ks_ssl->ssl, mydata_index, session); |
d7efe640 |
|
006d6a57 |
ASSERT((ks_ssl->ssl_bio = BIO_new(BIO_f_ssl())));
ASSERT((ks_ssl->ct_in = BIO_new(BIO_s_mem())));
ASSERT((ks_ssl->ct_out = BIO_new(BIO_s_mem()))); |
d7efe640 |
#ifdef BIO_DEBUG |
81d882d5 |
bio_debug_oc("open ssl_bio", ks_ssl->ssl_bio);
bio_debug_oc("open ct_in", ks_ssl->ct_in);
bio_debug_oc("open ct_out", ks_ssl->ct_out); |
d7efe640 |
#endif
|
81d882d5 |
if (is_server)
{
SSL_set_accept_state(ks_ssl->ssl);
}
else
{
SSL_set_connect_state(ks_ssl->ssl);
} |
d7efe640 |
|
81d882d5 |
SSL_set_bio(ks_ssl->ssl, ks_ssl->ct_in, ks_ssl->ct_out);
BIO_set_ssl(ks_ssl->ssl_bio, ks_ssl->ssl, BIO_NOCLOSE); |
d7efe640 |
}
|
81d882d5 |
void
key_state_ssl_free(struct key_state_ssl *ks_ssl) |
214fc873 |
{ |
81d882d5 |
if (ks_ssl->ssl)
{ |
214fc873 |
#ifdef BIO_DEBUG |
81d882d5 |
bio_debug_oc("close ssl_bio", ks_ssl->ssl_bio);
bio_debug_oc("close ct_in", ks_ssl->ct_in);
bio_debug_oc("close ct_out", ks_ssl->ct_out); |
214fc873 |
#endif |
81d882d5 |
BIO_free_all(ks_ssl->ssl_bio);
SSL_free(ks_ssl->ssl);
} |
214fc873 |
}
|
dd5e1102 |
int |
81d882d5 |
key_state_write_plaintext(struct key_state_ssl *ks_ssl, struct buffer *buf) |
bf707bd2 |
{ |
81d882d5 |
int ret = 0;
perf_push(PERF_BIO_WRITE_PLAINTEXT); |
bf707bd2 |
|
9b33b5a4 |
#ifdef ENABLE_CRYPTO_OPENSSL |
81d882d5 |
ASSERT(NULL != ks_ssl); |
bf707bd2 |
|
81d882d5 |
ret = bio_write(ks_ssl->ssl_bio, BPTR(buf), BLEN(buf),
"tls_write_plaintext");
bio_write_post(ret, buf); |
9b33b5a4 |
#endif /* ENABLE_CRYPTO_OPENSSL */ |
bf707bd2 |
|
81d882d5 |
perf_pop();
return ret; |
bf707bd2 |
}
int |
81d882d5 |
key_state_write_plaintext_const(struct key_state_ssl *ks_ssl, const uint8_t *data, int len) |
bf707bd2 |
{ |
81d882d5 |
int ret = 0;
perf_push(PERF_BIO_WRITE_PLAINTEXT); |
bf707bd2 |
|
81d882d5 |
ASSERT(NULL != ks_ssl); |
bf707bd2 |
|
81d882d5 |
ret = bio_write(ks_ssl->ssl_bio, data, len, "tls_write_plaintext_const"); |
bf707bd2 |
|
81d882d5 |
perf_pop();
return ret; |
bf707bd2 |
}
int |
81d882d5 |
key_state_read_ciphertext(struct key_state_ssl *ks_ssl, struct buffer *buf,
int maxlen) |
dd5e1102 |
{ |
81d882d5 |
int ret = 0;
perf_push(PERF_BIO_READ_CIPHERTEXT); |
dd5e1102 |
|
81d882d5 |
ASSERT(NULL != ks_ssl); |
dd5e1102 |
|
81d882d5 |
ret = bio_read(ks_ssl->ct_out, buf, maxlen, "tls_read_ciphertext"); |
dd5e1102 |
|
81d882d5 |
perf_pop();
return ret; |
dd5e1102 |
}
int |
81d882d5 |
key_state_write_ciphertext(struct key_state_ssl *ks_ssl, struct buffer *buf) |
bf707bd2 |
{ |
81d882d5 |
int ret = 0;
perf_push(PERF_BIO_WRITE_CIPHERTEXT); |
bf707bd2 |
|
81d882d5 |
ASSERT(NULL != ks_ssl); |
bf707bd2 |
|
81d882d5 |
ret = bio_write(ks_ssl->ct_in, BPTR(buf), BLEN(buf), "tls_write_ciphertext");
bio_write_post(ret, buf); |
bf707bd2 |
|
81d882d5 |
perf_pop();
return ret; |
bf707bd2 |
}
int |
81d882d5 |
key_state_read_plaintext(struct key_state_ssl *ks_ssl, struct buffer *buf,
int maxlen) |
dd5e1102 |
{ |
81d882d5 |
int ret = 0;
perf_push(PERF_BIO_READ_PLAINTEXT); |
dd5e1102 |
|
81d882d5 |
ASSERT(NULL != ks_ssl); |
dd5e1102 |
|
81d882d5 |
ret = bio_read(ks_ssl->ssl_bio, buf, maxlen, "tls_read_plaintext"); |
dd5e1102 |
|
81d882d5 |
perf_pop();
return ret; |
dd5e1102 |
}
|
963ad54e |
/* **************************************
*
* Information functions
*
* Print information for the end user.
*
***************************************/
void |
81d882d5 |
print_details(struct key_state_ssl *ks_ssl, const char *prefix) |
963ad54e |
{ |
81d882d5 |
const SSL_CIPHER *ciph;
X509 *cert;
char s1[256];
char s2[256];
s1[0] = s2[0] = 0;
ciph = SSL_get_current_cipher(ks_ssl->ssl);
openvpn_snprintf(s1, sizeof(s1), "%s %s, cipher %s %s",
prefix,
SSL_get_version(ks_ssl->ssl),
SSL_CIPHER_get_version(ciph),
SSL_CIPHER_get_name(ciph));
cert = SSL_get_peer_certificate(ks_ssl->ssl);
if (cert != NULL)
{
EVP_PKEY *pkey = X509_get_pubkey(cert);
if (pkey != NULL)
{ |
bb23eca8 |
if ((EVP_PKEY_id(pkey) == EVP_PKEY_RSA) && (EVP_PKEY_get0_RSA(pkey) != NULL)) |
81d882d5 |
{ |
f7780af6 |
RSA *rsa = EVP_PKEY_get0_RSA(pkey); |
81d882d5 |
openvpn_snprintf(s2, sizeof(s2), ", %d bit RSA", |
f7780af6 |
RSA_bits(rsa)); |
81d882d5 |
} |
bb23eca8 |
else if ((EVP_PKEY_id(pkey) == EVP_PKEY_DSA) && (EVP_PKEY_get0_DSA(pkey) != NULL)) |
81d882d5 |
{ |
c07c0358 |
DSA *dsa = EVP_PKEY_get0_DSA(pkey); |
81d882d5 |
openvpn_snprintf(s2, sizeof(s2), ", %d bit DSA", |
c07c0358 |
DSA_bits(dsa)); |
81d882d5 |
} |
bb23eca8 |
#ifndef OPENSSL_NO_EC
else if ((EVP_PKEY_id(pkey) == EVP_PKEY_EC) && (EVP_PKEY_get0_EC_KEY(pkey) != NULL))
{
EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
const EC_GROUP *group = EC_KEY_get0_group(ec);
const char* curve;
int nid = EC_GROUP_get_curve_name(group);
if (nid == 0 || (curve = OBJ_nid2sn(nid)) == NULL)
{
curve = "Error getting curve name";
}
openvpn_snprintf(s2, sizeof(s2), ", %d bit EC, curve: %s",
EC_GROUP_order_bits(group), curve);
}
#endif |
81d882d5 |
EVP_PKEY_free(pkey);
}
X509_free(cert);
}
/* The SSL API does not allow us to look at temporary RSA/DH keys,
* otherwise we should print their lengths too */
msg(D_HANDSHAKE, "%s%s", s1, s2); |
963ad54e |
}
|
244da317 |
void |
aba75874 |
show_available_tls_ciphers(const char *cipher_list,
const char *tls_cert_profile) |
397c0a35 |
{ |
81d882d5 |
struct tls_root_ctx tls_ctx;
SSL *ssl;
const char *cipher_name;
const tls_cipher_name_pair *pair;
int priority = 0;
tls_ctx.ctx = SSL_CTX_new(SSLv23_method());
if (!tls_ctx.ctx)
{
crypto_msg(M_FATAL, "Cannot create SSL_CTX object");
} |
397c0a35 |
|
81d882d5 |
ssl = SSL_new(tls_ctx.ctx);
if (!ssl)
{
crypto_msg(M_FATAL, "Cannot create SSL object");
} |
397c0a35 |
|
aba75874 |
tls_ctx_set_cert_profile(&tls_ctx, tls_cert_profile); |
81d882d5 |
tls_ctx_restrict_ciphers(&tls_ctx, cipher_list); |
cb03dca8 |
|
81d882d5 |
printf("Available TLS Ciphers,\n");
printf("listed in order of preference:\n\n");
while ((cipher_name = SSL_get_cipher_list(ssl, priority++))) |
3b23b18d |
{ |
81d882d5 |
pair = tls_get_cipher_name_pair(cipher_name, strlen(cipher_name)); |
3b23b18d |
|
81d882d5 |
if (NULL == pair)
{
/* No translation found, print warning */
printf("%s (No IANA name known to OpenVPN, use OpenSSL name.)\n", cipher_name);
}
else
{
printf("%s\n", pair->iana_name);
} |
3b23b18d |
} |
81d882d5 |
printf("\n" SHOW_TLS_CIPHER_LIST_WARNING); |
397c0a35 |
|
81d882d5 |
SSL_free(ssl);
SSL_CTX_free(tls_ctx.ctx); |
397c0a35 |
} |
b64ffdcf |
|
609e8131 |
/*
* Show the Elliptic curves that are available for us to use
* in the OpenSSL library.
*/
void |
e2a0cad4 |
show_available_curves(void) |
609e8131 |
{
#ifndef OPENSSL_NO_EC |
81d882d5 |
EC_builtin_curve *curves = NULL;
size_t crv_len = 0;
size_t n = 0;
crv_len = EC_get_builtin_curves(NULL, 0);
ALLOC_ARRAY(curves, EC_builtin_curve, crv_len);
if (EC_get_builtin_curves(curves, crv_len))
{
printf("Available Elliptic curves:\n");
for (n = 0; n < crv_len; n++)
{
const char *sname;
sname = OBJ_nid2sn(curves[n].nid);
if (sname == NULL)
{
sname = "";
}
printf("%s\n", sname);
}
}
else
{
crypto_msg(M_FATAL, "Cannot get list of builtin curves");
}
free(curves);
#else /* ifndef OPENSSL_NO_EC */
msg(M_WARN, "Your OpenSSL library was built without elliptic curve support. "
"No curves available.");
#endif /* ifndef OPENSSL_NO_EC */ |
609e8131 |
}
|
b64ffdcf |
void |
81d882d5 |
get_highest_preference_tls_cipher(char *buf, int size) |
b64ffdcf |
{ |
81d882d5 |
SSL_CTX *ctx;
SSL *ssl;
const char *cipher_name;
ctx = SSL_CTX_new(SSLv23_method());
if (!ctx)
{
crypto_msg(M_FATAL, "Cannot create SSL_CTX object");
}
ssl = SSL_new(ctx);
if (!ssl)
{
crypto_msg(M_FATAL, "Cannot create SSL object");
}
cipher_name = SSL_get_cipher_list(ssl, 0);
strncpynt(buf, cipher_name, size);
SSL_free(ssl);
SSL_CTX_free(ctx); |
b64ffdcf |
} |
31ea2ee4 |
|
5b17803e |
const char * |
1ec984b1 |
get_ssl_library_version(void)
{
return SSLeay_version(SSLEAY_VERSION);
}
|
c7ca9133 |
#endif /* defined(ENABLE_CRYPTO_OPENSSL) */ |