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NetBSD/dist/hostapd/tls_openssl.c

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/*
* WPA Supplicant / SSL/TLS interface functions for openssl
* Copyright (c) 2004-2006, Jouni Malinen <jkmaline@cc.hut.fi>
*
* 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.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifndef CONFIG_SMARTCARD
#ifndef OPENSSL_NO_ENGINE
#define OPENSSL_NO_ENGINE
#endif
#endif
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/pkcs12.h>
#include <openssl/x509v3.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif /* OPENSSL_NO_ENGINE */
#include "common.h"
#include "tls.h"
#if OPENSSL_VERSION_NUMBER >= 0x0090800fL
#define OPENSSL_d2i_TYPE const unsigned char **
#else
#define OPENSSL_d2i_TYPE unsigned char **
#endif
static int tls_openssl_ref_count = 0;
struct tls_connection {
SSL *ssl;
BIO *ssl_in, *ssl_out;
#ifndef OPENSSL_NO_ENGINE
ENGINE *engine; /* functional reference to the engine */
EVP_PKEY *private_key; /* the private key if using engine */
#endif /* OPENSSL_NO_ENGINE */
char *subject_match, *altsubject_match;
int read_alerts, write_alerts, failed;
u8 *pre_shared_secret;
size_t pre_shared_secret_len;
};
#ifdef CONFIG_NO_STDOUT_DEBUG
static void _tls_show_errors(void)
{
unsigned long err;
while ((err = ERR_get_error())) {
/* Just ignore the errors, since stdout is disabled */
}
}
#define tls_show_errors(l, f, t) _tls_show_errors()
#else /* CONFIG_NO_STDOUT_DEBUG */
static void tls_show_errors(int level, const char *func, const char *txt)
{
unsigned long err;
wpa_printf(level, "OpenSSL: %s - %s %s",
func, txt, ERR_error_string(ERR_get_error(), NULL));
while ((err = ERR_get_error())) {
wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
ERR_error_string(err, NULL));
}
}
#endif /* CONFIG_NO_STDOUT_DEBUG */
#ifdef CONFIG_NATIVE_WINDOWS
/* Windows CryptoAPI and access to certificate stores */
#include <wincrypt.h>
#ifdef __MINGW32_VERSION
/*
* MinGW does not yet include all the needed definitions for CryptoAPI, so
* define here whatever extra is needed.
*/
#define CALG_SSL3_SHAMD5 (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SSL3SHAMD5)
#define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
#define CERT_STORE_READONLY_FLAG 0x00008000
#define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
#define CRYPT_ACQUIRE_COMPARE_KEY_FLAG 0x00000004
static BOOL WINAPI
(*CryptAcquireCertificatePrivateKey)(PCCERT_CONTEXT pCert, DWORD dwFlags,
void *pvReserved, HCRYPTPROV *phCryptProv,
DWORD *pdwKeySpec, BOOL *pfCallerFreeProv)
= NULL; /* to be loaded from crypt32.dll */
static PCCERT_CONTEXT WINAPI
(*CertEnumCertificatesInStore)(HCERTSTORE hCertStore,
PCCERT_CONTEXT pPrevCertContext)
= NULL; /* to be loaded from crypt32.dll */
static int mingw_load_crypto_func(void)
{
HINSTANCE dll;
/* MinGW does not yet have full CryptoAPI support, so load the needed
* function here. */
if (CryptAcquireCertificatePrivateKey)
return 0;
dll = LoadLibrary("crypt32");
if (dll == NULL) {
wpa_printf(MSG_DEBUG, "CryptoAPI: Could not load crypt32 "
"library");
return -1;
}
CryptAcquireCertificatePrivateKey = GetProcAddress(
dll, "CryptAcquireCertificatePrivateKey");
if (CryptAcquireCertificatePrivateKey == NULL) {
wpa_printf(MSG_DEBUG, "CryptoAPI: Could not get "
"CryptAcquireCertificatePrivateKey() address from "
"crypt32 library");
return -1;
}
CertEnumCertificatesInStore = (void *) GetProcAddress(
dll, "CertEnumCertificatesInStore");
if (CertEnumCertificatesInStore == NULL) {
wpa_printf(MSG_DEBUG, "CryptoAPI: Could not get "
"CertEnumCertificatesInStore() address from "
"crypt32 library");
return -1;
}
return 0;
}
#else /* __MINGW32_VERSION */
static int mingw_load_crypto_func(void)
{
return 0;
}
#endif /* __MINGW32_VERSION */
struct cryptoapi_rsa_data {
const CERT_CONTEXT *cert;
HCRYPTPROV crypt_prov;
DWORD key_spec;
BOOL free_crypt_prov;
};
static void cryptoapi_error(const char *msg)
{
wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
msg, (unsigned int) GetLastError());
}
static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding)
{
wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
return 0;
}
static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding)
{
wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
return 0;
}
static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding)
{
struct cryptoapi_rsa_data *priv =
(struct cryptoapi_rsa_data *) rsa->meth->app_data;
HCRYPTHASH hash;
DWORD hash_size, len, i;
unsigned char *buf = NULL;
int ret = 0;
if (priv == NULL) {
RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (padding != RSA_PKCS1_PADDING) {
RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
RSA_R_UNKNOWN_PADDING_TYPE);
return 0;
}
if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
__func__);
RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
RSA_R_INVALID_MESSAGE_LENGTH);
return 0;
}
if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
{
cryptoapi_error("CryptCreateHash failed");
return 0;
}
len = sizeof(hash_size);
if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
0)) {
cryptoapi_error("CryptGetHashParam failed");
goto err;
}
if (hash_size != flen) {
wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
(unsigned) hash_size, flen);
RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
RSA_R_INVALID_MESSAGE_LENGTH);
goto err;
}
if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
cryptoapi_error("CryptSetHashParam failed");
goto err;
}
len = RSA_size(rsa);
buf = malloc(len);
if (buf == NULL) {
RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
cryptoapi_error("CryptSignHash failed");
goto err;
}
for (i = 0; i < len; i++)
to[i] = buf[len - i - 1];
ret = len;
err:
free(buf);
CryptDestroyHash(hash);
return ret;
}
static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding)
{
wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
return 0;
}
static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
{
if (priv == NULL)
return;
if (priv->crypt_prov && priv->free_crypt_prov)
CryptReleaseContext(priv->crypt_prov, 0);
if (priv->cert)
CertFreeCertificateContext(priv->cert);
free(priv);
}
static int cryptoapi_finish(RSA *rsa)
{
cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
free((void *) rsa->meth);
rsa->meth = NULL;
return 1;
}
static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
{
HCERTSTORE cs;
const CERT_CONTEXT *ret = NULL;
cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
store | CERT_STORE_OPEN_EXISTING_FLAG |
CERT_STORE_READONLY_FLAG, L"MY");
if (cs == NULL) {
cryptoapi_error("Failed to open 'My system store'");
return NULL;
}
if (strncmp(name, "cert://", 7) == 0) {
unsigned short wbuf[255];
MultiByteToWideChar(CP_ACP, 0, name + 7, -1,
wbuf, sizeof(wbuf));
ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
PKCS_7_ASN_ENCODING,
0, CERT_FIND_SUBJECT_STR,
wbuf, NULL);
} else if (strncmp(name, "hash://", 7) == 0) {
CRYPT_HASH_BLOB blob;
int len;
const char *hash = name + 7;
unsigned char *buf;
len = strlen(hash) / 2;
buf = malloc(len);
if (buf && hexstr2bin(hash, buf, len) == 0) {
blob.cbData = len;
blob.pbData = buf;
ret = CertFindCertificateInStore(cs,
X509_ASN_ENCODING |
PKCS_7_ASN_ENCODING,
0, CERT_FIND_HASH,
&blob, NULL);
}
free(buf);
}
CertCloseStore(cs, 0);
return ret;
}
static int tls_cryptoapi_cert(SSL *ssl, const char *name)
{
X509 *cert = NULL;
RSA *rsa = NULL, *pub_rsa;
struct cryptoapi_rsa_data *priv;
RSA_METHOD *rsa_meth;
if (name == NULL ||
(strncmp(name, "cert://", 7) != 0 &&
strncmp(name, "hash://", 7) != 0))
return -1;
priv = malloc(sizeof(*priv));
rsa_meth = malloc(sizeof(*rsa_meth));
if (priv == NULL || rsa_meth == NULL) {
wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
"for CryptoAPI RSA method");
free(priv);
free(rsa_meth);
return -1;
}
memset(priv, 0, sizeof(*priv));
memset(rsa_meth, 0, sizeof(*rsa_meth));
priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
if (priv->cert == NULL) {
priv->cert = cryptoapi_find_cert(
name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
}
if (priv->cert == NULL) {
wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
"'%s'", name);
goto err;
}
cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &priv->cert->pbCertEncoded,
priv->cert->cbCertEncoded);
if (cert == NULL) {
wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
"encoding");
goto err;
}
if (mingw_load_crypto_func())
goto err;
if (!CryptAcquireCertificatePrivateKey(priv->cert,
CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
NULL, &priv->crypt_prov,
&priv->key_spec,
&priv->free_crypt_prov)) {
cryptoapi_error("Failed to acquire a private key for the "
"certificate");
goto err;
}
rsa_meth->name = "Microsoft CryptoAPI RSA Method";
rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
rsa_meth->finish = cryptoapi_finish;
rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
rsa_meth->app_data = (char *) priv;
rsa = RSA_new();
if (rsa == NULL) {
SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
ERR_R_MALLOC_FAILURE);
goto err;
}
if (!SSL_use_certificate(ssl, cert))
goto err;
pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
X509_free(cert);
cert = NULL;
rsa->n = BN_dup(pub_rsa->n);
rsa->e = BN_dup(pub_rsa->e);
if (!RSA_set_method(rsa, rsa_meth))
goto err;
if (!SSL_use_RSAPrivateKey(ssl, rsa))
goto err;
RSA_free(rsa);
return 0;
err:
if (cert)
X509_free(cert);
if (rsa)
RSA_free(rsa);
else {
free(rsa_meth);
cryptoapi_free_data(priv);
}
return -1;
}
static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
{
HCERTSTORE cs;
PCCERT_CONTEXT ctx = NULL;
X509 *cert;
char buf[128];
if (mingw_load_crypto_func())
return -1;
if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
return -1;
cs = CertOpenSystemStore(0, name + 13);
if (cs == NULL) {
wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
"'%s': error=%d", __func__, name + 13,
(int) GetLastError());
return -1;
}
while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ctx->pbCertEncoded,
ctx->cbCertEncoded);
if (cert == NULL) {
wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
"X509 DER encoding for CA cert");
continue;
}
X509_NAME_oneline(X509_get_subject_name(cert), buf,
sizeof(buf));
wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
"system certificate store: subject='%s'", buf);
if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
tls_show_errors(MSG_WARNING, __func__,
"Failed to add ca_cert to OpenSSL "
"certificate store");
}
X509_free(cert);
}
if (!CertCloseStore(cs, 0)) {
wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
"'%s': error=%d", __func__, name + 13,
(int) GetLastError());
}
return 0;
}
#else /* CONFIG_NATIVE_WINDOWS */
static int tls_cryptoapi_cert(SSL *ssl, const char *name)
{
return -1;
}
#endif /* CONFIG_NATIVE_WINDOWS */
static void ssl_info_cb(const SSL *ssl, int where, int ret)
{
const char *str;
int w;
wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
w = where & ~SSL_ST_MASK;
if (w & SSL_ST_CONNECT)
str = "SSL_connect";
else if (w & SSL_ST_ACCEPT)
str = "SSL_accept";
else
str = "undefined";
if (where & SSL_CB_LOOP) {
wpa_printf(MSG_DEBUG, "SSL: %s:%s",
str, SSL_state_string_long(ssl));
} else if (where & SSL_CB_ALERT) {
wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
where & SSL_CB_READ ?
"read (remote end reported an error)" :
"write (local SSL3 detected an error)",
SSL_alert_type_string_long(ret),
SSL_alert_desc_string_long(ret));
if ((ret >> 8) == SSL3_AL_FATAL) {
struct tls_connection *conn =
SSL_get_app_data((SSL *) ssl);
if (where & SSL_CB_READ)
conn->read_alerts++;
else
conn->write_alerts++;
}
} else if (where & SSL_CB_EXIT && ret <= 0) {
wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
str, ret == 0 ? "failed" : "error",
SSL_state_string_long(ssl));
}
}
#ifndef OPENSSL_NO_ENGINE
/**
* tls_engine_load_dynamic_generic - load any openssl engine
* @pre: an array of commands and values that load an engine initialized
* in the engine specific function
* @post: an array of commands and values that initialize an already loaded
* engine (or %NULL if not required)
* @id: the engine id of the engine to load (only required if post is not %NULL
*
* This function is a generic function that loads any openssl engine.
*
* Returns: 0 on success, -1 on failure
*/
static int tls_engine_load_dynamic_generic(const char *pre[],
const char *post[], const char *id)
{
ENGINE *engine;
const char *dynamic_id = "dynamic";
engine = ENGINE_by_id(id);
if (engine) {
ENGINE_free(engine);
wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
"available", id);
return 0;
}
ERR_clear_error();
engine = ENGINE_by_id(dynamic_id);
if (engine == NULL) {
wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
dynamic_id,
ERR_error_string(ERR_get_error(), NULL));
return -1;
}
/* Perform the pre commands. This will load the engine. */
while (pre && pre[0]) {
wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
"%s %s [%s]", pre[0], pre[1],
ERR_error_string(ERR_get_error(), NULL));
ENGINE_free(engine);
return -1;
}
pre += 2;
}
/*
* Free the reference to the "dynamic" engine. The loaded engine can
* now be looked up using ENGINE_by_id().
*/
ENGINE_free(engine);
engine = ENGINE_by_id(id);
if (engine == NULL) {
wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
id, ERR_error_string(ERR_get_error(), NULL));
return -1;
}
while (post && post[0]) {
wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
" %s %s [%s]", post[0], post[1],
ERR_error_string(ERR_get_error(), NULL));
ENGINE_remove(engine);
ENGINE_free(engine);
return -1;
}
post += 2;
}
ENGINE_free(engine);
return 0;
}
/**
* tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
* @pkcs11_so_path: pksc11_so_path from the configuration
* @pcks11_module_path: pkcs11_module_path from the configuration
*/
static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
const char *pkcs11_module_path)
{
char *engine_id = "pkcs11";
const char *pre_cmd[] = {
"SO_PATH", pkcs11_so_path,
"ID", engine_id,
"LIST_ADD", "1",
/* "NO_VCHECK", "1", */
"LOAD", NULL,
NULL, NULL
};
const char *post_cmd[] = {
"MODULE_PATH", pkcs11_module_path,
NULL, NULL
};
if (!pkcs11_so_path || !pkcs11_module_path)
return 0;
wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
pkcs11_so_path);
return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
}
/**
* tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
* @opensc_so_path: opensc_so_path from the configuration
*/
static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
{
char *engine_id = "opensc";
const char *pre_cmd[] = {
"SO_PATH", opensc_so_path,
"ID", engine_id,
"LIST_ADD", "1",
"LOAD", NULL,
NULL, NULL
};
if (!opensc_so_path)
return 0;
wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
opensc_so_path);
return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
}
#endif /* OPENSSL_NO_ENGINE */
void * tls_init(const struct tls_config *conf)
{
SSL_CTX *ssl;
if (tls_openssl_ref_count == 0) {
SSL_load_error_strings();
SSL_library_init();
/* TODO: if /dev/urandom is available, PRNG is seeded
* automatically. If this is not the case, random data should
* be added here. */
#ifdef PKCS12_FUNCS
PKCS12_PBE_add();
#endif /* PKCS12_FUNCS */
}
tls_openssl_ref_count++;
ssl = SSL_CTX_new(TLSv1_method());
if (ssl == NULL)
return NULL;
SSL_CTX_set_info_callback(ssl, ssl_info_cb);
#ifndef OPENSSL_NO_ENGINE
if (conf &&
(conf->opensc_engine_path || conf->pkcs11_engine_path ||
conf->pkcs11_module_path)) {
wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
ERR_load_ENGINE_strings();
ENGINE_load_dynamic();
if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
conf->pkcs11_module_path)) {
tls_deinit(ssl);
return NULL;
}
}
#endif /* OPENSSL_NO_ENGINE */
return ssl;
}
void tls_deinit(void *ssl_ctx)
{
SSL_CTX *ssl = ssl_ctx;
SSL_CTX_free(ssl);
tls_openssl_ref_count--;
if (tls_openssl_ref_count == 0) {
#ifndef OPENSSL_NO_ENGINE
ENGINE_cleanup();
#endif /* OPENSSL_NO_ENGINE */
ERR_free_strings();
EVP_cleanup();
}
}
static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
const char *pin, const char *key_id)
{
#ifndef OPENSSL_NO_ENGINE
int ret = -1;
if (engine_id == NULL) {
wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
return -1;
}
if (pin == NULL) {
wpa_printf(MSG_ERROR, "ENGINE: Smartcard PIN not set");
return -1;
}
if (key_id == NULL) {
wpa_printf(MSG_ERROR, "ENGINE: Key Id not set");
return -1;
}
ERR_clear_error();
conn->engine = ENGINE_by_id(engine_id);
if (!conn->engine) {
wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
engine_id, ERR_error_string(ERR_get_error(), NULL));
goto err;
}
if (ENGINE_init(conn->engine) != 1) {
wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
"(engine: %s) [%s]", engine_id,
ERR_error_string(ERR_get_error(), NULL));
goto err;
}
wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
if (ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
ERR_error_string(ERR_get_error(), NULL));
goto err;
}
conn->private_key = ENGINE_load_private_key(conn->engine,
key_id, NULL, NULL);
if (!conn->private_key) {
wpa_printf(MSG_ERROR, "ENGINE: cannot load private key with id"
" '%s' [%s]", key_id,
ERR_error_string(ERR_get_error(), NULL));
ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
goto err;
}
return 0;
err:
if (conn->engine) {
ENGINE_free(conn->engine);
conn->engine = NULL;
}
if (conn->private_key) {
EVP_PKEY_free(conn->private_key);
conn->private_key = NULL;
}
return ret;
#else /* OPENSSL_NO_ENGINE */
return 0;
#endif /* OPENSSL_NO_ENGINE */
}
static void tls_engine_deinit(struct tls_connection *conn)
{
#ifndef OPENSSL_NO_ENGINE
wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
if (conn->private_key) {
EVP_PKEY_free(conn->private_key);
conn->private_key = NULL;
}
if (conn->engine) {
ENGINE_finish(conn->engine);
conn->engine = NULL;
}
#endif /* OPENSSL_NO_ENGINE */
}
int tls_get_errors(void *ssl_ctx)
{
int count = 0;
unsigned long err;
while ((err = ERR_get_error())) {
wpa_printf(MSG_INFO, "TLS - SSL error: %s",
ERR_error_string(err, NULL));
count++;
}
return count;
}
struct tls_connection * tls_connection_init(void *ssl_ctx)
{
SSL_CTX *ssl = ssl_ctx;
struct tls_connection *conn;
conn = malloc(sizeof(*conn));
if (conn == NULL)
return NULL;
memset(conn, 0, sizeof(*conn));
conn->ssl = SSL_new(ssl);
if (conn->ssl == NULL) {
tls_show_errors(MSG_INFO, __func__,
"Failed to initialize new SSL connection");
free(conn);
return NULL;
}
SSL_set_app_data(conn->ssl, conn);
SSL_set_options(conn->ssl,
SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
SSL_OP_SINGLE_DH_USE);
conn->ssl_in = BIO_new(BIO_s_mem());
if (!conn->ssl_in) {
tls_show_errors(MSG_INFO, __func__,
"Failed to create a new BIO for ssl_in");
SSL_free(conn->ssl);
free(conn);
return NULL;
}
conn->ssl_out = BIO_new(BIO_s_mem());
if (!conn->ssl_out) {
tls_show_errors(MSG_INFO, __func__,
"Failed to create a new BIO for ssl_out");
SSL_free(conn->ssl);
BIO_free(conn->ssl_in);
free(conn);
return NULL;
}
SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
return conn;
}
void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
{
if (conn == NULL)
return;
free(conn->pre_shared_secret);
SSL_free(conn->ssl);
tls_engine_deinit(conn);
free(conn->subject_match);
free(conn->altsubject_match);
free(conn);
}
int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
{
return conn ? SSL_is_init_finished(conn->ssl) : 0;
}
int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
{
if (conn == NULL)
return -1;
/* Shutdown previous TLS connection without notifying the peer
* because the connection was already terminated in practice
* and "close notify" shutdown alert would confuse AS. */
SSL_set_quiet_shutdown(conn->ssl, 1);
SSL_shutdown(conn->ssl);
return 0;
}
static int tls_match_altsubject(X509 *cert, const char *match)
{
GENERAL_NAME *gen;
char *field, *tmp;
void *ext;
int i, found = 0;
size_t len;
ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
gen = sk_GENERAL_NAME_value(ext, i);
switch (gen->type) {
case GEN_EMAIL:
field = "EMAIL";
break;
case GEN_DNS:
field = "DNS";
break;
case GEN_URI:
field = "URI";
break;
default:
field = NULL;
wpa_printf(MSG_DEBUG, "TLS: altSubjectName: "
"unsupported type=%d", gen->type);
break;
}
if (!field)
continue;
wpa_printf(MSG_DEBUG, "TLS: altSubjectName: %s:%s",
field, gen->d.ia5->data);
len = strlen(field) + 1 + strlen((char *) gen->d.ia5->data) +
1;
tmp = malloc(len);
if (tmp == NULL)
continue;
snprintf(tmp, len, "%s:%s", field, gen->d.ia5->data);
if (strstr(tmp, match))
found++;
free(tmp);
}
return found;
}
static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
{
char buf[256];
X509 *err_cert;
int err, depth;
SSL *ssl;
struct tls_connection *conn;
char *match, *altmatch;
err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
err = X509_STORE_CTX_get_error(x509_ctx);
depth = X509_STORE_CTX_get_error_depth(x509_ctx);
ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
SSL_get_ex_data_X509_STORE_CTX_idx());
X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
conn = SSL_get_app_data(ssl);
match = conn ? conn->subject_match : NULL;
altmatch = conn ? conn->altsubject_match : NULL;
if (!preverify_ok) {
wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
" error %d (%s) depth %d for '%s'", err,
X509_verify_cert_error_string(err), depth, buf);
} else {
wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - "
"preverify_ok=%d err=%d (%s) depth=%d buf='%s'",
preverify_ok, err,
X509_verify_cert_error_string(err), depth, buf);
if (depth == 0 && match && strstr(buf, match) == NULL) {
wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
"match with '%s'", buf, match);
preverify_ok = 0;
} else if (depth == 0 && altmatch &&
!tls_match_altsubject(err_cert, altmatch)) {
wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
"'%s' not found", altmatch);
preverify_ok = 0;
}
}
return preverify_ok;
}
#ifndef OPENSSL_NO_STDIO
static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
{
SSL_CTX *ssl_ctx = _ssl_ctx;
X509_LOOKUP *lookup;
int ret = 0;
lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
X509_LOOKUP_file());
if (lookup == NULL) {
tls_show_errors(MSG_WARNING, __func__,
"Failed add lookup for X509 store");
return -1;
}
if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
unsigned long err = ERR_peek_error();
tls_show_errors(MSG_WARNING, __func__,
"Failed load CA in DER format");
if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
"cert already in hash table error",
__func__);
} else
ret = -1;
}
return ret;
}
#endif /* OPENSSL_NO_STDIO */
static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
const char *ca_cert, const u8 *ca_cert_blob,
size_t ca_cert_blob_len, const char *ca_path)
{
SSL_CTX *ssl_ctx = _ssl_ctx;
if (ca_cert_blob) {
X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
ca_cert_blob_len);
if (cert == NULL) {
tls_show_errors(MSG_WARNING, __func__,
"Failed to parse ca_cert_blob");
return -1;
}
if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
tls_show_errors(MSG_WARNING, __func__,
"Failed to add ca_cert_blob to "
"certificate store");
X509_free(cert);
return -1;
}
X509_free(cert);
wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
"to certificate store", __func__);
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
return 0;
}
#ifdef CONFIG_NATIVE_WINDOWS
if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
0) {
wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
"system certificate store");
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
return 0;
}
#endif /* CONFIG_NATIVE_WINDOWS */
if (ca_cert || ca_path) {
#ifndef OPENSSL_NO_STDIO
if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1) {
tls_show_errors(MSG_WARNING, __func__,
"Failed to load root certificates");
if (ca_cert &&
tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
"DER format CA certificate",
__func__);
} else
return -1;
} else {
wpa_printf(MSG_DEBUG, "TLS: Trusted root "
"certificate(s) loaded");
tls_get_errors(ssl_ctx);
}
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
#else /* OPENSSL_NO_STDIO */
wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
__func__);
return -1;
#endif /* OPENSSL_NO_STDIO */
} else {
/* No ca_cert configured - do not try to verify server
* certificate */
SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
}
return 0;
}
int tls_global_ca_cert(void *_ssl_ctx, const char *ca_cert)
{
SSL_CTX *ssl_ctx = _ssl_ctx;
if (ca_cert) {
if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
{
tls_show_errors(MSG_WARNING, __func__,
"Failed to load root certificates");
return -1;
}
wpa_printf(MSG_DEBUG, "TLS: Trusted root "
"certificate(s) loaded");
#ifndef OPENSSL_NO_STDIO
/* Add the same CAs to the client certificate requests */
SSL_CTX_set_client_CA_list(ssl_ctx,
SSL_load_client_CA_file(ca_cert));
#endif /* OPENSSL_NO_STDIO */
}
return 0;
}
int tls_global_set_verify(void *ssl_ctx, int check_crl)
{
int flags;
if (check_crl) {
X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
if (cs == NULL) {
tls_show_errors(MSG_INFO, __func__, "Failed to get "
"certificate store when enabling "
"check_crl");
return -1;
}
flags = X509_V_FLAG_CRL_CHECK;
if (check_crl == 2)
flags |= X509_V_FLAG_CRL_CHECK_ALL;
X509_STORE_set_flags(cs, flags);
}
return 0;
}
static int tls_connection_set_subject_match(void *ssl_ctx,
struct tls_connection *conn,
const char *subject_match,
const char *altsubject_match)
{
free(conn->subject_match);
conn->subject_match = NULL;
if (subject_match) {
conn->subject_match = strdup(subject_match);
if (conn->subject_match == NULL)
return -1;
}
free(conn->altsubject_match);
conn->altsubject_match = NULL;
if (altsubject_match) {
conn->altsubject_match = strdup(altsubject_match);
if (conn->altsubject_match == NULL)
return -1;
}
return 0;
}
int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
int verify_peer)
{
if (conn == NULL)
return -1;
if (verify_peer) {
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
} else {
SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
}
SSL_set_accept_state(conn->ssl);
return 0;
}
static int tls_connection_client_cert(void *ssl_ctx,
struct tls_connection *conn,
const char *client_cert,
const u8 *client_cert_blob,
size_t client_cert_blob_len)
{
if (client_cert == NULL && client_cert_blob == NULL)
return 0;
if (client_cert_blob &&
SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
client_cert_blob_len) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
"OK");
return 0;
} else if (client_cert_blob) {
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_certificate_ASN1 failed");
}
if (client_cert == NULL)
return -1;
#ifndef OPENSSL_NO_STDIO
if (SSL_use_certificate_file(conn->ssl, client_cert,
SSL_FILETYPE_ASN1) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
" --> OK");
return 0;
} else {
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_certificate_file (DER) failed");
}
if (SSL_use_certificate_file(conn->ssl, client_cert,
SSL_FILETYPE_PEM) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
" --> OK");
return 0;
} else {
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_certificate_file (PEM) failed");
}
#else /* OPENSSL_NO_STDIO */
wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
#endif /* OPENSSL_NO_STDIO */
return -1;
}
int tls_global_client_cert(void *_ssl_ctx, const char *client_cert)
{
#ifndef OPENSSL_NO_STDIO
SSL_CTX *ssl_ctx = _ssl_ctx;
if (client_cert == NULL)
return 0;
if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
SSL_FILETYPE_ASN1) != 1 &&
SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
SSL_FILETYPE_PEM) != 1) {
tls_show_errors(MSG_INFO, __func__,
"Failed to load client certificate");
return -1;
}
return 0;
#else /* OPENSSL_NO_STDIO */
if (client_cert == NULL)
return 0;
wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
return -1;
#endif /* OPENSSL_NO_STDIO */
}
static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
{
if (password == NULL) {
return 0;
}
strncpy(buf, (char *) password, size);
buf[size - 1] = '\0';
return strlen(buf);
}
#ifdef PKCS12_FUNCS
static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
const char *passwd)
{
EVP_PKEY *pkey;
X509 *cert;
STACK_OF(X509) *certs;
int res = 0;
char buf[256];
pkey = NULL;
cert = NULL;
certs = NULL;
if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
tls_show_errors(MSG_DEBUG, __func__,
"Failed to parse PKCS12 file");
PKCS12_free(p12);
return -1;
}
wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
if (cert) {
X509_NAME_oneline(X509_get_subject_name(cert), buf,
sizeof(buf));
wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
"subject='%s'", buf);
if (ssl) {
if (SSL_use_certificate(ssl, cert) != 1)
res = -1;
} else {
if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
res = -1;
}
X509_free(cert);
}
if (pkey) {
wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
if (ssl) {
if (SSL_use_PrivateKey(ssl, pkey) != 1)
res = -1;
} else {
if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
res = -1;
}
EVP_PKEY_free(pkey);
}
if (certs) {
while ((cert = sk_X509_pop(certs)) != NULL) {
X509_NAME_oneline(X509_get_subject_name(cert), buf,
sizeof(buf));
wpa_printf(MSG_DEBUG, "TLS: additional certificate"
" from PKCS12: subject='%s'", buf);
/*
* There is no SSL equivalent for the chain cert - so
* always add it to the context...
*/
if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
res = -1;
break;
}
}
sk_X509_free(certs);
}
PKCS12_free(p12);
if (res < 0)
tls_get_errors(ssl_ctx);
return res;
}
#endif /* PKCS12_FUNCS */
static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
const char *passwd)
{
#ifdef PKCS12_FUNCS
FILE *f;
PKCS12 *p12;
f = fopen(private_key, "r");
if (f == NULL)
return -1;
p12 = d2i_PKCS12_fp(f, NULL);
fclose(f);
if (p12 == NULL) {
tls_show_errors(MSG_INFO, __func__,
"Failed to use PKCS#12 file");
return -1;
}
return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
#else /* PKCS12_FUNCS */
wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
"p12/pfx files");
return -1;
#endif /* PKCS12_FUNCS */
}
static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
const u8 *blob, size_t len, const char *passwd)
{
#ifdef PKCS12_FUNCS
PKCS12 *p12;
p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
if (p12 == NULL) {
tls_show_errors(MSG_INFO, __func__,
"Failed to use PKCS#12 blob");
return -1;
}
return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
#else /* PKCS12_FUNCS */
wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
"p12/pfx blobs");
return -1;
#endif /* PKCS12_FUNCS */
}
static int tls_connection_engine_private_key(void *_ssl_ctx,
struct tls_connection *conn)
{
#ifndef OPENSSL_NO_ENGINE
if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
tls_show_errors(MSG_ERROR, __func__,
"ENGINE: cannot use private key for TLS");
return -1;
}
if (!SSL_check_private_key(conn->ssl)) {
tls_show_errors(MSG_INFO, __func__,
"Private key failed verification");
return -1;
}
return 0;
#else /* OPENSSL_NO_ENGINE */
wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
"engine support was not compiled in");
return -1;
#endif /* OPENSSL_NO_ENGINE */
}
static int tls_connection_private_key(void *_ssl_ctx,
struct tls_connection *conn,
const char *private_key,
const char *private_key_passwd,
const u8 *private_key_blob,
size_t private_key_blob_len)
{
SSL_CTX *ssl_ctx = _ssl_ctx;
char *passwd;
int ok;
if (private_key == NULL && private_key_blob == NULL)
return 0;
if (private_key_passwd) {
passwd = strdup(private_key_passwd);
if (passwd == NULL)
return -1;
} else
passwd = NULL;
SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
ok = 0;
while (private_key_blob) {
if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
(u8 *) private_key_blob,
private_key_blob_len) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
"ASN1(EVP_PKEY_RSA) --> OK");
ok = 1;
break;
} else {
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA)"
" failed");
}
if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
(u8 *) private_key_blob,
private_key_blob_len) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
"ASN1(EVP_PKEY_DSA) --> OK");
ok = 1;
break;
} else {
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA)"
" failed");
}
if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
(u8 *) private_key_blob,
private_key_blob_len) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: "
"SSL_use_RSAPrivateKey_ASN1 --> OK");
ok = 1;
break;
} else {
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_RSAPrivateKey_ASN1 failed");
}
if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
private_key_blob_len, passwd) == 0) {
wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
"OK");
ok = 1;
break;
}
break;
}
while (!ok && private_key) {
#ifndef OPENSSL_NO_STDIO
if (SSL_use_PrivateKey_file(conn->ssl, private_key,
SSL_FILETYPE_ASN1) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: "
"SSL_use_PrivateKey_File (DER) --> OK");
ok = 1;
break;
} else {
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_PrivateKey_File (DER) "
"failed");
}
if (SSL_use_PrivateKey_file(conn->ssl, private_key,
SSL_FILETYPE_PEM) == 1) {
wpa_printf(MSG_DEBUG, "OpenSSL: "
"SSL_use_PrivateKey_File (PEM) --> OK");
ok = 1;
break;
} else {
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_PrivateKey_File (PEM) "
"failed");
}
#else /* OPENSSL_NO_STDIO */
wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
__func__);
#endif /* OPENSSL_NO_STDIO */
if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
== 0) {
wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
"--> OK");
ok = 1;
break;
}
if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
"access certificate store --> OK");
ok = 1;
break;
}
break;
}
if (!ok) {
wpa_printf(MSG_INFO, "OpenSSL: Failed to load private key");
free(passwd);
ERR_clear_error();
return -1;
}
ERR_clear_error();
SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
free(passwd);
if (!SSL_check_private_key(conn->ssl)) {
tls_show_errors(MSG_INFO, __func__, "Private key failed "
"verification");
return -1;
}
wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
return 0;
}
int tls_global_private_key(void *_ssl_ctx, const char *private_key,
const char *private_key_passwd)
{
SSL_CTX *ssl_ctx = _ssl_ctx;
char *passwd;
if (private_key == NULL)
return 0;
if (private_key_passwd) {
passwd = strdup(private_key_passwd);
if (passwd == NULL)
return -1;
} else
passwd = NULL;
SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
if (
#ifndef OPENSSL_NO_STDIO
SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
SSL_FILETYPE_ASN1) != 1 &&
SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
SSL_FILETYPE_PEM) != 1 &&
#endif /* OPENSSL_NO_STDIO */
tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
tls_show_errors(MSG_INFO, __func__,
"Failed to load private key");
free(passwd);
ERR_clear_error();
return -1;
}
free(passwd);
ERR_clear_error();
SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
if (!SSL_CTX_check_private_key(ssl_ctx)) {
tls_show_errors(MSG_INFO, __func__,
"Private key failed verification");
return -1;
}
return 0;
}
static int tls_connection_dh(void *ssl_ctx, struct tls_connection *conn,
const char *dh_file)
{
#ifdef OPENSSL_NO_DH
if (dh_file == NULL)
return 0;
wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
"dh_file specified");
return -1;
#else /* OPENSSL_NO_DH */
DH *dh;
BIO *bio;
/* TODO: add support for dh_blob */
if (dh_file == NULL)
return 0;
if (conn == NULL)
return -1;
bio = BIO_new_file(dh_file, "r");
if (bio == NULL) {
wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
dh_file, ERR_error_string(ERR_get_error(), NULL));
return -1;
}
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
BIO_free(bio);
#ifndef OPENSSL_NO_DSA
while (dh == NULL) {
DSA *dsa;
wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
" trying to parse as DSA params", dh_file,
ERR_error_string(ERR_get_error(), NULL));
bio = BIO_new_file(dh_file, "r");
if (bio == NULL)
break;
dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
BIO_free(bio);
if (!dsa) {
wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
"'%s': %s", dh_file,
ERR_error_string(ERR_get_error(), NULL));
break;
}
wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
dh = DSA_dup_DH(dsa);
DSA_free(dsa);
if (dh == NULL) {
wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
"params into DH params");
break;
}
break;
}
#endif /* !OPENSSL_NO_DSA */
if (dh == NULL) {
wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
"'%s'", dh_file);
return -1;
}
if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
"%s", dh_file,
ERR_error_string(ERR_get_error(), NULL));
DH_free(dh);
return -1;
}
DH_free(dh);
return 0;
#endif /* OPENSSL_NO_DH */
}
int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
struct tls_keys *keys)
{
SSL *ssl;
if (conn == NULL || keys == NULL)
return -1;
ssl = conn->ssl;
if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
return -1;
memset(keys, 0, sizeof(*keys));
keys->master_key = ssl->session->master_key;
keys->master_key_len = ssl->session->master_key_length;
keys->client_random = ssl->s3->client_random;
keys->client_random_len = SSL3_RANDOM_SIZE;
keys->server_random = ssl->s3->server_random;
keys->server_random_len = SSL3_RANDOM_SIZE;
return 0;
}
u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
const u8 *in_data, size_t in_len,
size_t *out_len)
{
int res;
u8 *out_data;
/*
* Give TLS handshake data from the server (if available) to OpenSSL
* for processing.
*/
if (in_data &&
BIO_write(conn->ssl_in, in_data, in_len) < 0) {
tls_show_errors(MSG_INFO, __func__,
"Handshake failed - BIO_write");
return NULL;
}
/* Initiate TLS handshake or continue the existing handshake */
res = SSL_connect(conn->ssl);
if (res != 1) {
int err = SSL_get_error(conn->ssl, res);
if (err == SSL_ERROR_WANT_READ)
wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
"more data");
else if (err == SSL_ERROR_WANT_WRITE)
wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
"write");
else {
tls_show_errors(MSG_INFO, __func__, "SSL_connect");
conn->failed++;
}
}
/* Get the TLS handshake data to be sent to the server */
res = BIO_ctrl_pending(conn->ssl_out);
wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
out_data = malloc(res == 0 ? 1 : res);
if (out_data == NULL) {
wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
"handshake output (%d bytes)", res);
if (BIO_reset(conn->ssl_out) < 0) {
tls_show_errors(MSG_INFO, __func__,
"BIO_reset failed");
}
*out_len = 0;
return NULL;
}
res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Handshake failed - BIO_read");
if (BIO_reset(conn->ssl_out) < 0) {
tls_show_errors(MSG_INFO, __func__,
"BIO_reset failed");
}
*out_len = 0;
return NULL;
}
*out_len = res;
return out_data;
}
u8 * tls_connection_server_handshake(void *ssl_ctx,
struct tls_connection *conn,
const u8 *in_data, size_t in_len,
size_t *out_len)
{
int res;
u8 *out_data;
char buf[10];
if (in_data &&
BIO_write(conn->ssl_in, in_data, in_len) < 0) {
tls_show_errors(MSG_INFO, __func__,
"Handshake failed - BIO_write");
return NULL;
}
res = SSL_read(conn->ssl, buf, sizeof(buf));
if (res >= 0) {
wpa_printf(MSG_DEBUG, "SSL: Unexpected data from SSL_read "
"(res=%d)", res);
}
res = BIO_ctrl_pending(conn->ssl_out);
wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
out_data = malloc(res == 0 ? 1 : res);
if (out_data == NULL) {
wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
"handshake output (%d bytes)", res);
if (BIO_reset(conn->ssl_out) < 0) {
tls_show_errors(MSG_INFO, __func__,
"BIO_reset failed");
}
*out_len = 0;
return NULL;
}
res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Handshake failed - BIO_read");
if (BIO_reset(conn->ssl_out) < 0) {
tls_show_errors(MSG_INFO, __func__,
"BIO_reset failed");
}
*out_len = 0;
return NULL;
}
*out_len = res;
return out_data;
}
int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
const u8 *in_data, size_t in_len,
u8 *out_data, size_t out_len)
{
int res;
if (conn == NULL)
return -1;
/* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
if ((res = BIO_reset(conn->ssl_in)) < 0 ||
(res = BIO_reset(conn->ssl_out)) < 0) {
tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
return res;
}
res = SSL_write(conn->ssl, in_data, in_len);
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Encryption failed - SSL_write");
return res;
}
/* Read encrypted data to be sent to the server */
res = BIO_read(conn->ssl_out, out_data, out_len);
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Encryption failed - BIO_read");
return res;
}
return res;
}
int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
const u8 *in_data, size_t in_len,
u8 *out_data, size_t out_len)
{
int res;
/* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
res = BIO_write(conn->ssl_in, in_data, in_len);
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Decryption failed - BIO_write");
return res;
}
if (BIO_reset(conn->ssl_out) < 0) {
tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
return res;
}
/* Read decrypted data for further processing */
res = SSL_read(conn->ssl, out_data, out_len);
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Decryption failed - SSL_read");
return res;
}
return res;
}
int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
{
return conn ? conn->ssl->hit : 0;
}
#ifdef EAP_FAST
/* Pre-shared secred requires a patch to openssl, so this function is
* commented out unless explicitly needed for EAP-FAST in order to be able to
* build this file with unmodified openssl. */
static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
STACK_OF(SSL_CIPHER) *peer_ciphers,
SSL_CIPHER **cipher, void *arg)
{
struct tls_connection *conn = arg;
if (conn == NULL || conn->pre_shared_secret == 0)
return 0;
memcpy(secret, conn->pre_shared_secret, conn->pre_shared_secret_len);
*secret_len = conn->pre_shared_secret_len;
return 1;
}
int tls_connection_set_master_key(void *ssl_ctx, struct tls_connection *conn,
const u8 *key, size_t key_len)
{
if (conn == NULL || key_len > SSL_MAX_MASTER_KEY_LENGTH)
return -1;
free(conn->pre_shared_secret);
conn->pre_shared_secret = NULL;
conn->pre_shared_secret_len = 0;
if (key) {
conn->pre_shared_secret = malloc(key_len);
if (conn->pre_shared_secret) {
memcpy(conn->pre_shared_secret, key, key_len);
conn->pre_shared_secret_len = key_len;
}
if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
conn) != 1)
return -1;
} else {
if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
return -1;
}
return 0;
}
#endif /* EAP_FAST */
int tls_connection_set_anon_dh(void *ssl_ctx, struct tls_connection *conn)
{
if (conn == NULL || conn->ssl == NULL)
return -1;
if (SSL_set_cipher_list(conn->ssl, "ADH-AES128-SHA") != 1) {
tls_show_errors(MSG_INFO, __func__,
"Anon DH configuration failed");
return -1;
}
return 0;
}
int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
char *buf, size_t buflen)
{
const char *name;
if (conn == NULL || conn->ssl == NULL)
return -1;
name = SSL_get_cipher(conn->ssl);
if (name == NULL)
return -1;
snprintf(buf, buflen, "%s", name);
return 0;
}
int tls_connection_enable_workaround(void *ssl_ctx,
struct tls_connection *conn)
{
SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
return 0;
}
#ifdef EAP_FAST
/* ClientHello TLS extensions require a patch to openssl, so this function is
* commented out unless explicitly needed for EAP-FAST in order to be able to
* build this file with unmodified openssl. */
int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
int ext_type, const u8 *data,
size_t data_len)
{
if (conn == NULL || conn->ssl == NULL)
return -1;
if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
data_len) != 1)
return -1;
return 0;
}
#endif /* EAP_FAST */
int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
{
if (conn == NULL)
return -1;
return conn->failed;
}
int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
{
if (conn == NULL)
return -1;
return conn->read_alerts;
}
int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
{
if (conn == NULL)
return -1;
return conn->write_alerts;
}
int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
const struct tls_connection_params *params)
{
int ret;
unsigned long err;
if (conn == NULL)
return -1;
while ((err = ERR_get_error())) {
wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
__func__, ERR_error_string(err, NULL));
}
if (tls_connection_set_subject_match(tls_ctx, conn,
params->subject_match,
params->altsubject_match))
return -1;
if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
params->ca_cert_blob,
params->ca_cert_blob_len,
params->ca_path))
return -1;
if (tls_connection_client_cert(tls_ctx, conn, params->client_cert,
params->client_cert_blob,
params->client_cert_blob_len))
return -1;
if (params->engine) {
wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
ret = tls_engine_init(conn, params->engine_id, params->pin,
params->key_id);
if (ret)
return ret;
if (tls_connection_engine_private_key(tls_ctx, conn))
return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
} else if (tls_connection_private_key(tls_ctx, conn,
params->private_key,
params->private_key_passwd,
params->private_key_blob,
params->private_key_blob_len)) {
wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
params->private_key);
return -1;
}
if (tls_connection_dh(tls_ctx, conn, params->dh_file)) {
wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
params->dh_file);
return -1;
}
tls_get_errors(tls_ctx);
return 0;
}
int tls_connection_get_keyblock_size(void *tls_ctx,
struct tls_connection *conn)
{
const EVP_CIPHER *c;
const EVP_MD *h;
if (conn == NULL || conn->ssl == NULL ||
conn->ssl->enc_read_ctx == NULL ||
conn->ssl->enc_read_ctx->cipher == NULL ||
conn->ssl->read_hash == NULL)
return -1;
c = conn->ssl->enc_read_ctx->cipher;
h = conn->ssl->read_hash;
return 2 * (EVP_CIPHER_key_length(c) +
EVP_MD_size(h) +
EVP_CIPHER_iv_length(c));
}
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