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hostap/src/crypto/tls_openssl.c
Johannes Berg a1f11e34c4 Use os_memdup() 
This leads to cleaner code overall, and also reduces the size
of the hostapd and wpa_supplicant binaries (in hwsim test build
on x86_64) by about 2.5 and 3.5KiB respectively.

The mechanical conversions all over the code were done with
the following spatch:

    @@
    expression SIZE, SRC;
    expression a;
    @@
    -a = os_malloc(SIZE);
    +a = os_memdup(SRC, SIZE);
    <...
    if (!a) {...}
    ...>
    -os_memcpy(a, SRC, SIZE);

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-03-07 13:19:10 +02:00

4347 lines
108 KiB
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/*
* SSL/TLS interface functions for OpenSSL
* Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#ifndef CONFIG_SMARTCARD
#ifndef OPENSSL_NO_ENGINE
#ifndef ANDROID
#define OPENSSL_NO_ENGINE
#endif
#endif
#endif
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/opensslv.h>
#include <openssl/pkcs12.h>
#include <openssl/x509v3.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif /* OPENSSL_NO_ENGINE */
#ifndef OPENSSL_NO_DSA
#include <openssl/dsa.h>
#endif
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
#include "common.h"
#include "crypto.h"
#include "sha1.h"
#include "sha256.h"
#include "tls.h"
#include "tls_openssl.h"
#if !defined(CONFIG_FIPS) && \
(defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || \
defined(EAP_SERVER_FAST))
#define OPENSSL_NEED_EAP_FAST_PRF
#endif
#if defined(OPENSSL_IS_BORINGSSL)
/* stack_index_t is the return type of OpenSSL's sk_XXX_num() functions. */
typedef size_t stack_index_t;
#else
typedef int stack_index_t;
#endif
#ifdef SSL_set_tlsext_status_type
#ifndef OPENSSL_NO_TLSEXT
#define HAVE_OCSP
#include <openssl/ocsp.h>
#endif /* OPENSSL_NO_TLSEXT */
#endif /* SSL_set_tlsext_status_type */
#if (OPENSSL_VERSION_NUMBER < 0x10100000L || \
defined(LIBRESSL_VERSION_NUMBER)) && \
!defined(BORINGSSL_API_VERSION)
/*
* SSL_get_client_random() and SSL_get_server_random() were added in OpenSSL
* 1.1.0 and newer BoringSSL revisions. Provide compatibility wrappers for
* older versions.
*/
static size_t SSL_get_client_random(const SSL *ssl, unsigned char *out,
size_t outlen)
{
if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
return 0;
os_memcpy(out, ssl->s3->client_random, SSL3_RANDOM_SIZE);
return SSL3_RANDOM_SIZE;
}
static size_t SSL_get_server_random(const SSL *ssl, unsigned char *out,
size_t outlen)
{
if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
return 0;
os_memcpy(out, ssl->s3->server_random, SSL3_RANDOM_SIZE);
return SSL3_RANDOM_SIZE;
}
#ifdef OPENSSL_NEED_EAP_FAST_PRF
static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
unsigned char *out, size_t outlen)
{
if (!session || session->master_key_length < 0 ||
(size_t) session->master_key_length > outlen)
return 0;
if ((size_t) session->master_key_length < outlen)
outlen = session->master_key_length;
os_memcpy(out, session->master_key, outlen);
return outlen;
}
#endif /* OPENSSL_NEED_EAP_FAST_PRF */
#endif
#ifdef ANDROID
#include <openssl/pem.h>
#include <keystore/keystore_get.h>
static BIO * BIO_from_keystore(const char *key)
{
BIO *bio = NULL;
uint8_t *value = NULL;
int length = keystore_get(key, strlen(key), &value);
if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
BIO_write(bio, value, length);
free(value);
return bio;
}
static int tls_add_ca_from_keystore(X509_STORE *ctx, const char *key_alias)
{
BIO *bio = BIO_from_keystore(key_alias);
STACK_OF(X509_INFO) *stack = NULL;
stack_index_t i;
if (bio) {
stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
BIO_free(bio);
}
if (!stack) {
wpa_printf(MSG_WARNING, "TLS: Failed to parse certificate: %s",
key_alias);
return -1;
}
for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
X509_INFO *info = sk_X509_INFO_value(stack, i);
if (info->x509)
X509_STORE_add_cert(ctx, info->x509);
if (info->crl)
X509_STORE_add_crl(ctx, info->crl);
}
sk_X509_INFO_pop_free(stack, X509_INFO_free);
return 0;
}
static int tls_add_ca_from_keystore_encoded(X509_STORE *ctx,
const char *encoded_key_alias)
{
int rc = -1;
int len = os_strlen(encoded_key_alias);
unsigned char *decoded_alias;
if (len & 1) {
wpa_printf(MSG_WARNING, "Invalid hex-encoded alias: %s",
encoded_key_alias);
return rc;
}
decoded_alias = os_malloc(len / 2 + 1);
if (decoded_alias) {
if (!hexstr2bin(encoded_key_alias, decoded_alias, len / 2)) {
decoded_alias[len / 2] = '\0';
rc = tls_add_ca_from_keystore(
ctx, (const char *) decoded_alias);
}
os_free(decoded_alias);
}
return rc;
}
#endif /* ANDROID */
static int tls_openssl_ref_count = 0;
static int tls_ex_idx_session = -1;
struct tls_context {
void (*event_cb)(void *ctx, enum tls_event ev,
union tls_event_data *data);
void *cb_ctx;
int cert_in_cb;
char *ocsp_stapling_response;
};
static struct tls_context *tls_global = NULL;
struct tls_data {
SSL_CTX *ssl;
unsigned int tls_session_lifetime;
};
struct tls_connection {
struct tls_context *context;
SSL_CTX *ssl_ctx;
SSL *ssl;
BIO *ssl_in, *ssl_out;
#if defined(ANDROID) || !defined(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, *suffix_match, *domain_match;
int read_alerts, write_alerts, failed;
tls_session_ticket_cb session_ticket_cb;
void *session_ticket_cb_ctx;
/* SessionTicket received from OpenSSL hello_extension_cb (server) */
u8 *session_ticket;
size_t session_ticket_len;
unsigned int ca_cert_verify:1;
unsigned int cert_probe:1;
unsigned int server_cert_only:1;
unsigned int invalid_hb_used:1;
unsigned int success_data:1;
u8 srv_cert_hash[32];
unsigned int flags;
X509 *peer_cert;
X509 *peer_issuer;
X509 *peer_issuer_issuer;
unsigned char client_random[SSL3_RANDOM_SIZE];
unsigned char server_random[SSL3_RANDOM_SIZE];
};
static struct tls_context * tls_context_new(const struct tls_config *conf)
{
struct tls_context *context = os_zalloc(sizeof(*context));
if (context == NULL)
return NULL;
if (conf) {
context->event_cb = conf->event_cb;
context->cb_ctx = conf->cb_ctx;
context->cert_in_cb = conf->cert_in_cb;
}
return context;
}
#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 CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
#define CERT_STORE_READONLY_FLAG 0x00008000
#define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
#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 ((int) 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 = os_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:
os_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);
os_free(priv);
}
static int cryptoapi_finish(RSA *rsa)
{
cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
os_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, 255);
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 = os_strlen(hash) / 2;
buf = os_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);
}
os_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 = os_zalloc(sizeof(*priv));
rsa_meth = os_zalloc(sizeof(*rsa_meth));
if (priv == NULL || rsa_meth == NULL) {
wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
"for CryptoAPI RSA method");
os_free(priv);
os_free(rsa_meth);
return -1;
}
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,
(const unsigned char **) &priv->cert->pbCertEncoded,
priv->cert->cbCertEncoded);
if (cert == NULL) {
wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
"encoding");
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)) {
RSA_free(rsa);
rsa = NULL;
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 {
os_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];
const char *store;
#ifdef UNICODE
WCHAR *wstore;
#endif /* UNICODE */
if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
return -1;
store = name + 13;
#ifdef UNICODE
wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
if (wstore == NULL)
return -1;
wsprintf(wstore, L"%S", store);
cs = CertOpenSystemStore(0, wstore);
os_free(wstore);
#else /* UNICODE */
cs = CertOpenSystemStore(0, store);
#endif /* UNICODE */
if (cs == NULL) {
wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
"'%s': error=%d", __func__, store,
(int) GetLastError());
return -1;
}
while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
cert = d2i_X509(NULL,
(const unsigned char **) &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_get_cert_store(ssl_ctx),
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) {
struct tls_connection *conn = SSL_get_app_data((SSL *) ssl);
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) {
if (where & SSL_CB_READ)
conn->read_alerts++;
else
conn->write_alerts++;
}
if (conn->context->event_cb != NULL) {
union tls_event_data ev;
struct tls_context *context = conn->context;
os_memset(&ev, 0, sizeof(ev));
ev.alert.is_local = !(where & SSL_CB_READ);
ev.alert.type = SSL_alert_type_string_long(ret);
ev.alert.description = SSL_alert_desc_string_long(ret);
context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
}
} 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) {
wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
"available", id);
/*
* If it was auto-loaded by ENGINE_by_id() we might still
* need to tell it which PKCS#11 module to use in legacy
* (non-p11-kit) environments. Do so now; even if it was
* properly initialised before, setting it again will be
* harmless.
*/
goto found;
}
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;
}
found:
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", NULL /* pkcs11_so_path */,
"ID", NULL /* engine_id */,
"LIST_ADD", "1",
/* "NO_VCHECK", "1", */
"LOAD", NULL,
NULL, NULL
};
const char *post_cmd[] = {
"MODULE_PATH", NULL /* pkcs11_module_path */,
NULL, NULL
};
if (!pkcs11_so_path)
return 0;
pre_cmd[1] = pkcs11_so_path;
pre_cmd[3] = engine_id;
if (pkcs11_module_path)
post_cmd[1] = pkcs11_module_path;
else
post_cmd[0] = NULL;
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", NULL /* opensc_so_path */,
"ID", NULL /* engine_id */,
"LIST_ADD", "1",
"LOAD", NULL,
NULL, NULL
};
if (!opensc_so_path)
return 0;
pre_cmd[1] = opensc_so_path;
pre_cmd[3] = engine_id;
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 */
static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess)
{
struct wpabuf *buf;
if (tls_ex_idx_session < 0)
return;
buf = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
if (!buf)
return;
wpa_printf(MSG_DEBUG,
"OpenSSL: Free application session data %p (sess %p)",
buf, sess);
wpabuf_free(buf);
SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL);
}
void * tls_init(const struct tls_config *conf)
{
struct tls_data *data;
SSL_CTX *ssl;
struct tls_context *context;
const char *ciphers;
if (tls_openssl_ref_count == 0) {
tls_global = context = tls_context_new(conf);
if (context == NULL)
return NULL;
#ifdef CONFIG_FIPS
#ifdef OPENSSL_FIPS
if (conf && conf->fips_mode) {
static int fips_enabled = 0;
if (!fips_enabled && !FIPS_mode_set(1)) {
wpa_printf(MSG_ERROR, "Failed to enable FIPS "
"mode");
ERR_load_crypto_strings();
ERR_print_errors_fp(stderr);
os_free(tls_global);
tls_global = NULL;
return NULL;
} else {
wpa_printf(MSG_INFO, "Running in FIPS mode");
fips_enabled = 1;
}
}
#else /* OPENSSL_FIPS */
if (conf && conf->fips_mode) {
wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
"supported");
os_free(tls_global);
tls_global = NULL;
return NULL;
}
#endif /* OPENSSL_FIPS */
#endif /* CONFIG_FIPS */
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
SSL_load_error_strings();
SSL_library_init();
#ifndef OPENSSL_NO_SHA256
EVP_add_digest(EVP_sha256());
#endif /* OPENSSL_NO_SHA256 */
/* 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
#ifndef OPENSSL_NO_RC2
/*
* 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
* This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
* versions, but it looks like OpenSSL 1.0.0 does not do that
* anymore.
*/
EVP_add_cipher(EVP_rc2_40_cbc());
#endif /* OPENSSL_NO_RC2 */
PKCS12_PBE_add();
#endif /* PKCS12_FUNCS */
#endif /* < 1.1.0 */
} else {
context = tls_context_new(conf);
if (context == NULL)
return NULL;
}
tls_openssl_ref_count++;
data = os_zalloc(sizeof(*data));
if (data)
ssl = SSL_CTX_new(SSLv23_method());
else
ssl = NULL;
if (ssl == NULL) {
tls_openssl_ref_count--;
if (context != tls_global)
os_free(context);
if (tls_openssl_ref_count == 0) {
os_free(tls_global);
tls_global = NULL;
}
os_free(data);
return NULL;
}
data->ssl = ssl;
if (conf)
data->tls_session_lifetime = conf->tls_session_lifetime;
SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2);
SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3);
#ifdef SSL_MODE_NO_AUTO_CHAIN
/* Number of deployed use cases assume the default OpenSSL behavior of
* auto chaining the local certificate is in use. BoringSSL removed this
* functionality by default, so we need to restore it here to avoid
* breaking existing use cases. */
SSL_CTX_clear_mode(ssl, SSL_MODE_NO_AUTO_CHAIN);
#endif /* SSL_MODE_NO_AUTO_CHAIN */
SSL_CTX_set_info_callback(ssl, ssl_info_cb);
SSL_CTX_set_app_data(ssl, context);
if (data->tls_session_lifetime > 0) {
SSL_CTX_set_quiet_shutdown(ssl, 1);
/*
* Set default context here. In practice, this will be replaced
* by the per-EAP method context in tls_connection_set_verify().
*/
SSL_CTX_set_session_id_context(ssl, (u8 *) "hostapd", 7);
SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_SERVER);
SSL_CTX_set_timeout(ssl, data->tls_session_lifetime);
SSL_CTX_sess_set_remove_cb(ssl, remove_session_cb);
} else {
SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_OFF);
}
if (tls_ex_idx_session < 0) {
tls_ex_idx_session = SSL_SESSION_get_ex_new_index(
0, NULL, NULL, NULL, NULL);
if (tls_ex_idx_session < 0) {
tls_deinit(data);
return NULL;
}
}
#ifndef OPENSSL_NO_ENGINE
wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
ERR_load_ENGINE_strings();
ENGINE_load_dynamic();
if (conf &&
(conf->opensc_engine_path || conf->pkcs11_engine_path ||
conf->pkcs11_module_path)) {
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(data);
return NULL;
}
}
#endif /* OPENSSL_NO_ENGINE */
if (conf && conf->openssl_ciphers)
ciphers = conf->openssl_ciphers;
else
ciphers = "DEFAULT:!EXP:!LOW";
if (SSL_CTX_set_cipher_list(ssl, ciphers) != 1) {
wpa_printf(MSG_ERROR,
"OpenSSL: Failed to set cipher string '%s'",
ciphers);
tls_deinit(data);
return NULL;
}
return data;
}
void tls_deinit(void *ssl_ctx)
{
struct tls_data *data = ssl_ctx;
SSL_CTX *ssl = data->ssl;
struct tls_context *context = SSL_CTX_get_app_data(ssl);
if (context != tls_global)
os_free(context);
if (data->tls_session_lifetime > 0)
SSL_CTX_flush_sessions(ssl, 0);
SSL_CTX_free(ssl);
tls_openssl_ref_count--;
if (tls_openssl_ref_count == 0) {
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
#ifndef OPENSSL_NO_ENGINE
ENGINE_cleanup();
#endif /* OPENSSL_NO_ENGINE */
CRYPTO_cleanup_all_ex_data();
ERR_remove_thread_state(NULL);
ERR_free_strings();
EVP_cleanup();
#endif /* < 1.1.0 */
os_free(tls_global->ocsp_stapling_response);
tls_global->ocsp_stapling_response = NULL;
os_free(tls_global);
tls_global = NULL;
}
os_free(data);
}
#ifndef OPENSSL_NO_ENGINE
/* Cryptoki return values */
#define CKR_PIN_INCORRECT 0x000000a0
#define CKR_PIN_INVALID 0x000000a1
#define CKR_PIN_LEN_RANGE 0x000000a2
/* libp11 */
#define ERR_LIB_PKCS11 ERR_LIB_USER
static int tls_is_pin_error(unsigned int err)
{
return ERR_GET_LIB(err) == ERR_LIB_PKCS11 &&
(ERR_GET_REASON(err) == CKR_PIN_INCORRECT ||
ERR_GET_REASON(err) == CKR_PIN_INVALID ||
ERR_GET_REASON(err) == CKR_PIN_LEN_RANGE);
}
#endif /* OPENSSL_NO_ENGINE */
#ifdef ANDROID
/* EVP_PKEY_from_keystore comes from system/security/keystore-engine. */
EVP_PKEY * EVP_PKEY_from_keystore(const char *key_id);
#endif /* ANDROID */
static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
const char *pin, const char *key_id,
const char *cert_id, const char *ca_cert_id)
{
#if defined(ANDROID) && defined(OPENSSL_IS_BORINGSSL)
#if !defined(OPENSSL_NO_ENGINE)
#error "This code depends on OPENSSL_NO_ENGINE being defined by BoringSSL."
#endif
if (!key_id)
return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
conn->engine = NULL;
conn->private_key = EVP_PKEY_from_keystore(key_id);
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));
return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
}
#endif /* ANDROID && OPENSSL_IS_BORINGSSL */
#ifndef OPENSSL_NO_ENGINE
int ret = -1;
if (engine_id == NULL) {
wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
return -1;
}
ERR_clear_error();
#ifdef ANDROID
ENGINE_load_dynamic();
#endif
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");
#ifndef ANDROID
if (pin && 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;
}
#endif
if (key_id) {
/*
* Ensure that the ENGINE does not attempt to use the OpenSSL
* UI system to obtain a PIN, if we didn't provide one.
*/
struct {
const void *password;
const char *prompt_info;
} key_cb = { "", NULL };
/* load private key first in-case PIN is required for cert */
conn->private_key = ENGINE_load_private_key(conn->engine,
key_id, NULL,
&key_cb);
if (!conn->private_key) {
unsigned long err = ERR_get_error();
wpa_printf(MSG_ERROR,
"ENGINE: cannot load private key with id '%s' [%s]",
key_id,
ERR_error_string(err, NULL));
if (tls_is_pin_error(err))
ret = TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
else
ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
goto err;
}
}
/* handle a certificate and/or CA certificate */
if (cert_id || ca_cert_id) {
const char *cmd_name = "LOAD_CERT_CTRL";
/* test if the engine supports a LOAD_CERT_CTRL */
if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
0, (void *)cmd_name, NULL)) {
wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
" loading certificates");
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)
{
#if defined(ANDROID) || !defined(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) {
#if !defined(OPENSSL_IS_BORINGSSL)
ENGINE_finish(conn->engine);
#endif /* !OPENSSL_IS_BORINGSSL */
conn->engine = NULL;
}
#endif /* ANDROID || !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;
}
static const char * openssl_content_type(int content_type)
{
switch (content_type) {
case 20:
return "change cipher spec";
case 21:
return "alert";
case 22:
return "handshake";
case 23:
return "application data";
case 24:
return "heartbeat";
case 256:
return "TLS header info"; /* pseudo content type */
default:
return "?";
}
}
static const char * openssl_handshake_type(int content_type, const u8 *buf,
size_t len)
{
if (content_type != 22 || !buf || len == 0)
return "";
switch (buf[0]) {
case 0:
return "hello request";
case 1:
return "client hello";
case 2:
return "server hello";
case 4:
return "new session ticket";
case 11:
return "certificate";
case 12:
return "server key exchange";
case 13:
return "certificate request";
case 14:
return "server hello done";
case 15:
return "certificate verify";
case 16:
return "client key exchange";
case 20:
return "finished";
case 21:
return "certificate url";
case 22:
return "certificate status";
default:
return "?";
}
}
static void tls_msg_cb(int write_p, int version, int content_type,
const void *buf, size_t len, SSL *ssl, void *arg)
{
struct tls_connection *conn = arg;
const u8 *pos = buf;
if (write_p == 2) {
wpa_printf(MSG_DEBUG,
"OpenSSL: session ver=0x%x content_type=%d",
version, content_type);
wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Data", buf, len);
return;
}
wpa_printf(MSG_DEBUG, "OpenSSL: %s ver=0x%x content_type=%d (%s/%s)",
write_p ? "TX" : "RX", version, content_type,
openssl_content_type(content_type),
openssl_handshake_type(content_type, buf, len));
wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Message", buf, len);
if (content_type == 24 && len >= 3 && pos[0] == 1) {
size_t payload_len = WPA_GET_BE16(pos + 1);
if (payload_len + 3 > len) {
wpa_printf(MSG_ERROR, "OpenSSL: Heartbeat attack detected");
conn->invalid_hb_used = 1;
}
}
}
struct tls_connection * tls_connection_init(void *ssl_ctx)
{
struct tls_data *data = ssl_ctx;
SSL_CTX *ssl = data->ssl;
struct tls_connection *conn;
long options;
struct tls_context *context = SSL_CTX_get_app_data(ssl);
conn = os_zalloc(sizeof(*conn));
if (conn == NULL)
return NULL;
conn->ssl_ctx = ssl;
conn->ssl = SSL_new(ssl);
if (conn->ssl == NULL) {
tls_show_errors(MSG_INFO, __func__,
"Failed to initialize new SSL connection");
os_free(conn);
return NULL;
}
conn->context = context;
SSL_set_app_data(conn->ssl, conn);
SSL_set_msg_callback(conn->ssl, tls_msg_cb);
SSL_set_msg_callback_arg(conn->ssl, conn);
options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
SSL_OP_SINGLE_DH_USE;
#ifdef SSL_OP_NO_COMPRESSION
options |= SSL_OP_NO_COMPRESSION;
#endif /* SSL_OP_NO_COMPRESSION */
SSL_set_options(conn->ssl, options);
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);
os_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);
os_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;
if (conn->success_data) {
/*
* Make sure ssl_clear_bad_session() does not remove this
* session.
*/
SSL_set_quiet_shutdown(conn->ssl, 1);
SSL_shutdown(conn->ssl);
}
SSL_free(conn->ssl);
tls_engine_deinit(conn);
os_free(conn->subject_match);
os_free(conn->altsubject_match);
os_free(conn->suffix_match);
os_free(conn->domain_match);
os_free(conn->session_ticket);
os_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 SSL_clear(conn->ssl) == 1 ? 0 : -1;
}
static int tls_match_altsubject_component(X509 *cert, int type,
const char *value, size_t len)
{
GENERAL_NAME *gen;
void *ext;
int found = 0;
stack_index_t i;
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);
if (gen->type != type)
continue;
if (os_strlen((char *) gen->d.ia5->data) == len &&
os_memcmp(value, gen->d.ia5->data, len) == 0)
found++;
}
sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
return found;
}
static int tls_match_altsubject(X509 *cert, const char *match)
{
int type;
const char *pos, *end;
size_t len;
pos = match;
do {
if (os_strncmp(pos, "EMAIL:", 6) == 0) {
type = GEN_EMAIL;
pos += 6;
} else if (os_strncmp(pos, "DNS:", 4) == 0) {
type = GEN_DNS;
pos += 4;
} else if (os_strncmp(pos, "URI:", 4) == 0) {
type = GEN_URI;
pos += 4;
} else {
wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
"match '%s'", pos);
return 0;
}
end = os_strchr(pos, ';');
while (end) {
if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
os_strncmp(end + 1, "DNS:", 4) == 0 ||
os_strncmp(end + 1, "URI:", 4) == 0)
break;
end = os_strchr(end + 1, ';');
}
if (end)
len = end - pos;
else
len = os_strlen(pos);
if (tls_match_altsubject_component(cert, type, pos, len) > 0)
return 1;
pos = end + 1;
} while (end);
return 0;
}
#ifndef CONFIG_NATIVE_WINDOWS
static int domain_suffix_match(const u8 *val, size_t len, const char *match,
int full)
{
size_t i, match_len;
/* Check for embedded nuls that could mess up suffix matching */
for (i = 0; i < len; i++) {
if (val[i] == '\0') {
wpa_printf(MSG_DEBUG, "TLS: Embedded null in a string - reject");
return 0;
}
}
match_len = os_strlen(match);
if (match_len > len || (full && match_len != len))
return 0;
if (os_strncasecmp((const char *) val + len - match_len, match,
match_len) != 0)
return 0; /* no match */
if (match_len == len)
return 1; /* exact match */
if (val[len - match_len - 1] == '.')
return 1; /* full label match completes suffix match */
wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match");
return 0;
}
#endif /* CONFIG_NATIVE_WINDOWS */
static int tls_match_suffix(X509 *cert, const char *match, int full)
{
#ifdef CONFIG_NATIVE_WINDOWS
/* wincrypt.h has conflicting X509_NAME definition */
return -1;
#else /* CONFIG_NATIVE_WINDOWS */
GENERAL_NAME *gen;
void *ext;
int i;
stack_index_t j;
int dns_name = 0;
X509_NAME *name;
wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s",
full ? "": "suffix ", match);
ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) {
gen = sk_GENERAL_NAME_value(ext, j);
if (gen->type != GEN_DNS)
continue;
dns_name++;
wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName",
gen->d.dNSName->data,
gen->d.dNSName->length);
if (domain_suffix_match(gen->d.dNSName->data,
gen->d.dNSName->length, match, full) ==
1) {
wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found",
full ? "Match" : "Suffix match");
sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
return 1;
}
}
sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
if (dns_name) {
wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched");
return 0;
}
name = X509_get_subject_name(cert);
i = -1;
for (;;) {
X509_NAME_ENTRY *e;
ASN1_STRING *cn;
i = X509_NAME_get_index_by_NID(name, NID_commonName, i);
if (i == -1)
break;
e = X509_NAME_get_entry(name, i);
if (e == NULL)
continue;
cn = X509_NAME_ENTRY_get_data(e);
if (cn == NULL)
continue;
wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName",
cn->data, cn->length);
if (domain_suffix_match(cn->data, cn->length, match, full) == 1)
{
wpa_printf(MSG_DEBUG, "TLS: %s in commonName found",
full ? "Match" : "Suffix match");
return 1;
}
}
wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found",
full ? "": "suffix ");
return 0;
#endif /* CONFIG_NATIVE_WINDOWS */
}
static enum tls_fail_reason openssl_tls_fail_reason(int err)
{
switch (err) {
case X509_V_ERR_CERT_REVOKED:
return TLS_FAIL_REVOKED;
case X509_V_ERR_CERT_NOT_YET_VALID:
case X509_V_ERR_CRL_NOT_YET_VALID:
return TLS_FAIL_NOT_YET_VALID;
case X509_V_ERR_CERT_HAS_EXPIRED:
case X509_V_ERR_CRL_HAS_EXPIRED:
return TLS_FAIL_EXPIRED;
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
case X509_V_ERR_UNABLE_TO_GET_CRL:
case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
case X509_V_ERR_CERT_CHAIN_TOO_LONG:
case X509_V_ERR_PATH_LENGTH_EXCEEDED:
case X509_V_ERR_INVALID_CA:
return TLS_FAIL_UNTRUSTED;
case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
case X509_V_ERR_CERT_UNTRUSTED:
case X509_V_ERR_CERT_REJECTED:
return TLS_FAIL_BAD_CERTIFICATE;
default:
return TLS_FAIL_UNSPECIFIED;
}
}
static struct wpabuf * get_x509_cert(X509 *cert)
{
struct wpabuf *buf;
u8 *tmp;
int cert_len = i2d_X509(cert, NULL);
if (cert_len <= 0)
return NULL;
buf = wpabuf_alloc(cert_len);
if (buf == NULL)
return NULL;
tmp = wpabuf_put(buf, cert_len);
i2d_X509(cert, &tmp);
return buf;
}
static void openssl_tls_fail_event(struct tls_connection *conn,
X509 *err_cert, int err, int depth,
const char *subject, const char *err_str,
enum tls_fail_reason reason)
{
union tls_event_data ev;
struct wpabuf *cert = NULL;
struct tls_context *context = conn->context;
if (context->event_cb == NULL)
return;
cert = get_x509_cert(err_cert);
os_memset(&ev, 0, sizeof(ev));
ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
reason : openssl_tls_fail_reason(err);
ev.cert_fail.depth = depth;
ev.cert_fail.subject = subject;
ev.cert_fail.reason_txt = err_str;
ev.cert_fail.cert = cert;
context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
wpabuf_free(cert);
}
static void openssl_tls_cert_event(struct tls_connection *conn,
X509 *err_cert, int depth,
const char *subject)
{
struct wpabuf *cert = NULL;
union tls_event_data ev;
struct tls_context *context = conn->context;
char *altsubject[TLS_MAX_ALT_SUBJECT];
int alt, num_altsubject = 0;
GENERAL_NAME *gen;
void *ext;
stack_index_t i;
#ifdef CONFIG_SHA256
u8 hash[32];
#endif /* CONFIG_SHA256 */
if (context->event_cb == NULL)
return;
os_memset(&ev, 0, sizeof(ev));
if (conn->cert_probe || (conn->flags & TLS_CONN_EXT_CERT_CHECK) ||
context->cert_in_cb) {
cert = get_x509_cert(err_cert);
ev.peer_cert.cert = cert;
}
#ifdef CONFIG_SHA256
if (cert) {
const u8 *addr[1];
size_t len[1];
addr[0] = wpabuf_head(cert);
len[0] = wpabuf_len(cert);
if (sha256_vector(1, addr, len, hash) == 0) {
ev.peer_cert.hash = hash;
ev.peer_cert.hash_len = sizeof(hash);
}
}
#endif /* CONFIG_SHA256 */
ev.peer_cert.depth = depth;
ev.peer_cert.subject = subject;
ext = X509_get_ext_d2i(err_cert, NID_subject_alt_name, NULL, NULL);
for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
char *pos;
if (num_altsubject == TLS_MAX_ALT_SUBJECT)
break;
gen = sk_GENERAL_NAME_value(ext, i);
if (gen->type != GEN_EMAIL &&
gen->type != GEN_DNS &&
gen->type != GEN_URI)
continue;
pos = os_malloc(10 + gen->d.ia5->length + 1);
if (pos == NULL)
break;
altsubject[num_altsubject++] = pos;
switch (gen->type) {
case GEN_EMAIL:
os_memcpy(pos, "EMAIL:", 6);
pos += 6;
break;
case GEN_DNS:
os_memcpy(pos, "DNS:", 4);
pos += 4;
break;
case GEN_URI:
os_memcpy(pos, "URI:", 4);
pos += 4;
break;
}
os_memcpy(pos, gen->d.ia5->data, gen->d.ia5->length);
pos += gen->d.ia5->length;
*pos = '\0';
}
sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
for (alt = 0; alt < num_altsubject; alt++)
ev.peer_cert.altsubject[alt] = altsubject[alt];
ev.peer_cert.num_altsubject = num_altsubject;
context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
wpabuf_free(cert);
for (alt = 0; alt < num_altsubject; alt++)
os_free(altsubject[alt]);
}
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;
struct tls_context *context;
char *match, *altmatch, *suffix_match, *domain_match;
const char *err_str;
err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
if (!err_cert)
return 0;
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);
if (conn == NULL)
return 0;
if (depth == 0)
conn->peer_cert = err_cert;
else if (depth == 1)
conn->peer_issuer = err_cert;
else if (depth == 2)
conn->peer_issuer_issuer = err_cert;
context = conn->context;
match = conn->subject_match;
altmatch = conn->altsubject_match;
suffix_match = conn->suffix_match;
domain_match = conn->domain_match;
if (!preverify_ok && !conn->ca_cert_verify)
preverify_ok = 1;
if (!preverify_ok && depth > 0 && conn->server_cert_only)
preverify_ok = 1;
if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
(err == X509_V_ERR_CERT_HAS_EXPIRED ||
err == X509_V_ERR_CERT_NOT_YET_VALID)) {
wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
"time mismatch");
preverify_ok = 1;
}
err_str = X509_verify_cert_error_string(err);
#ifdef CONFIG_SHA256
/*
* Do not require preverify_ok so we can explicity allow otherwise
* invalid pinned server certificates.
*/
if (depth == 0 && conn->server_cert_only) {
struct wpabuf *cert;
cert = get_x509_cert(err_cert);
if (!cert) {
wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
"server certificate data");
preverify_ok = 0;
} else {
u8 hash[32];
const u8 *addr[1];
size_t len[1];
addr[0] = wpabuf_head(cert);
len[0] = wpabuf_len(cert);
if (sha256_vector(1, addr, len, hash) < 0 ||
os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
err_str = "Server certificate mismatch";
err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
preverify_ok = 0;
} else if (!preverify_ok) {
/*
* Certificate matches pinned certificate, allow
* regardless of other problems.
*/
wpa_printf(MSG_DEBUG,
"OpenSSL: Ignore validation issues for a pinned server certificate");
preverify_ok = 1;
}
wpabuf_free(cert);
}
}
#endif /* CONFIG_SHA256 */
if (!preverify_ok) {
wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
" error %d (%s) depth %d for '%s'", err, err_str,
depth, buf);
openssl_tls_fail_event(conn, err_cert, err, depth, buf,
err_str, TLS_FAIL_UNSPECIFIED);
return preverify_ok;
}
wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
"err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
preverify_ok, err, err_str,
conn->ca_cert_verify, depth, buf);
if (depth == 0 && match && os_strstr(buf, match) == NULL) {
wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
"match with '%s'", buf, match);
preverify_ok = 0;
openssl_tls_fail_event(conn, err_cert, err, depth, buf,
"Subject mismatch",
TLS_FAIL_SUBJECT_MISMATCH);
} 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;
openssl_tls_fail_event(conn, err_cert, err, depth, buf,
"AltSubject mismatch",
TLS_FAIL_ALTSUBJECT_MISMATCH);
} else if (depth == 0 && suffix_match &&
!tls_match_suffix(err_cert, suffix_match, 0)) {
wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found",
suffix_match);
preverify_ok = 0;
openssl_tls_fail_event(conn, err_cert, err, depth, buf,
"Domain suffix mismatch",
TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
} else if (depth == 0 && domain_match &&
!tls_match_suffix(err_cert, domain_match, 1)) {
wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found",
domain_match);
preverify_ok = 0;
openssl_tls_fail_event(conn, err_cert, err, depth, buf,
"Domain mismatch",
TLS_FAIL_DOMAIN_MISMATCH);
} else
openssl_tls_cert_event(conn, err_cert, depth, buf);
if (conn->cert_probe && preverify_ok && depth == 0) {
wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
"on probe-only run");
preverify_ok = 0;
openssl_tls_fail_event(conn, err_cert, err, depth, buf,
"Server certificate chain probe",
TLS_FAIL_SERVER_CHAIN_PROBE);
}
#ifdef OPENSSL_IS_BORINGSSL
if (depth == 0 && (conn->flags & TLS_CONN_REQUEST_OCSP) &&
preverify_ok) {
enum ocsp_result res;
res = check_ocsp_resp(conn->ssl_ctx, conn->ssl, err_cert,
conn->peer_issuer,
conn->peer_issuer_issuer);
if (res == OCSP_REVOKED) {
preverify_ok = 0;
openssl_tls_fail_event(conn, err_cert, err, depth, buf,
"certificate revoked",
TLS_FAIL_REVOKED);
if (err == X509_V_OK)
X509_STORE_CTX_set_error(
x509_ctx, X509_V_ERR_CERT_REVOKED);
} else if (res != OCSP_GOOD &&
(conn->flags & TLS_CONN_REQUIRE_OCSP)) {
preverify_ok = 0;
openssl_tls_fail_event(conn, err_cert, err, depth, buf,
"bad certificate status response",
TLS_FAIL_UNSPECIFIED);
}
}
#endif /* OPENSSL_IS_BORINGSSL */
if (depth == 0 && preverify_ok && context->event_cb != NULL)
context->event_cb(context->cb_ctx,
TLS_CERT_CHAIN_SUCCESS, NULL);
return preverify_ok;
}
#ifndef OPENSSL_NO_STDIO
static int tls_load_ca_der(struct tls_data *data, const char *ca_cert)
{
SSL_CTX *ssl_ctx = data->ssl;
X509_LOOKUP *lookup;
int ret = 0;
lookup = X509_STORE_add_lookup(SSL_CTX_get_cert_store(ssl_ctx),
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(struct tls_data *data,
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 = data->ssl;
X509_STORE *store;
/*
* Remove previously configured trusted CA certificates before adding
* new ones.
*/
store = X509_STORE_new();
if (store == NULL) {
wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
"certificate store", __func__);
return -1;
}
SSL_CTX_set_cert_store(ssl_ctx, store);
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
conn->ca_cert_verify = 1;
if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
"chain");
conn->cert_probe = 1;
conn->ca_cert_verify = 0;
return 0;
}
if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
#ifdef CONFIG_SHA256
const char *pos = ca_cert + 7;
if (os_strncmp(pos, "server/sha256/", 14) != 0) {
wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
"hash value '%s'", ca_cert);
return -1;
}
pos += 14;
if (os_strlen(pos) != 32 * 2) {
wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
"hash length in ca_cert '%s'", ca_cert);
return -1;
}
if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
"value in ca_cert '%s'", ca_cert);
return -1;
}
conn->server_cert_only = 1;
wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
"certificate match");
return 0;
#else /* CONFIG_SHA256 */
wpa_printf(MSG_INFO, "No SHA256 included in the build - "
"cannot validate server certificate hash");
return -1;
#endif /* CONFIG_SHA256 */
}
if (ca_cert_blob) {
X509 *cert = d2i_X509(NULL,
(const unsigned char **) &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_get_cert_store(ssl_ctx),
cert)) {
unsigned long err = ERR_peek_error();
tls_show_errors(MSG_WARNING, __func__,
"Failed to add ca_cert_blob to "
"certificate store");
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 {
X509_free(cert);
return -1;
}
}
X509_free(cert);
wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
"to certificate store", __func__);
return 0;
}
#ifdef ANDROID
/* Single alias */
if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
if (tls_add_ca_from_keystore(SSL_CTX_get_cert_store(ssl_ctx),
&ca_cert[11]) < 0)
return -1;
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
return 0;
}
/* Multiple aliases separated by space */
if (ca_cert && os_strncmp("keystores://", ca_cert, 12) == 0) {
char *aliases = os_strdup(&ca_cert[12]);
const char *delim = " ";
int rc = 0;
char *savedptr;
char *alias;
if (!aliases)
return -1;
alias = strtok_r(aliases, delim, &savedptr);
for (; alias; alias = strtok_r(NULL, delim, &savedptr)) {
if (tls_add_ca_from_keystore_encoded(
SSL_CTX_get_cert_store(ssl_ctx), alias)) {
wpa_printf(MSG_WARNING,
"OpenSSL: %s - Failed to add ca_cert %s from keystore",
__func__, alias);
rc = -1;
break;
}
}
os_free(aliases);
if (rc)
return rc;
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
return 0;
}
#endif /* ANDROID */
#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");
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(data, 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(data);
}
#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 */
conn->ca_cert_verify = 0;
}
return 0;
}
static int tls_global_ca_cert(struct tls_data *data, const char *ca_cert)
{
SSL_CTX *ssl_ctx = data->ssl;
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) {
struct tls_data *data = ssl_ctx;
X509_STORE *cs = SSL_CTX_get_cert_store(data->ssl);
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(struct tls_connection *conn,
const char *subject_match,
const char *altsubject_match,
const char *suffix_match,
const char *domain_match)
{
os_free(conn->subject_match);
conn->subject_match = NULL;
if (subject_match) {
conn->subject_match = os_strdup(subject_match);
if (conn->subject_match == NULL)
return -1;
}
os_free(conn->altsubject_match);
conn->altsubject_match = NULL;
if (altsubject_match) {
conn->altsubject_match = os_strdup(altsubject_match);
if (conn->altsubject_match == NULL)
return -1;
}
os_free(conn->suffix_match);
conn->suffix_match = NULL;
if (suffix_match) {
conn->suffix_match = os_strdup(suffix_match);
if (conn->suffix_match == NULL)
return -1;
}
os_free(conn->domain_match);
conn->domain_match = NULL;
if (domain_match) {
conn->domain_match = os_strdup(domain_match);
if (conn->domain_match == NULL)
return -1;
}
return 0;
}
static void tls_set_conn_flags(SSL *ssl, unsigned int flags)
{
#ifdef SSL_OP_NO_TICKET
if (flags & TLS_CONN_DISABLE_SESSION_TICKET)
SSL_set_options(ssl, SSL_OP_NO_TICKET);
else
SSL_clear_options(ssl, SSL_OP_NO_TICKET);
#endif /* SSL_OP_NO_TICKET */
#ifdef SSL_OP_NO_TLSv1
if (flags & TLS_CONN_DISABLE_TLSv1_0)
SSL_set_options(ssl, SSL_OP_NO_TLSv1);
else
SSL_clear_options(ssl, SSL_OP_NO_TLSv1);
#endif /* SSL_OP_NO_TLSv1 */
#ifdef SSL_OP_NO_TLSv1_1
if (flags & TLS_CONN_DISABLE_TLSv1_1)
SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
else
SSL_clear_options(ssl, SSL_OP_NO_TLSv1_1);
#endif /* SSL_OP_NO_TLSv1_1 */
#ifdef SSL_OP_NO_TLSv1_2
if (flags & TLS_CONN_DISABLE_TLSv1_2)
SSL_set_options(ssl, SSL_OP_NO_TLSv1_2);
else
SSL_clear_options(ssl, SSL_OP_NO_TLSv1_2);
#endif /* SSL_OP_NO_TLSv1_2 */
}
int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
int verify_peer, unsigned int flags,
const u8 *session_ctx, size_t session_ctx_len)
{
static int counter = 0;
struct tls_data *data = ssl_ctx;
if (conn == NULL)
return -1;
if (verify_peer) {
conn->ca_cert_verify = 1;
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
} else {
conn->ca_cert_verify = 0;
SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
}
tls_set_conn_flags(conn->ssl, flags);
conn->flags = flags;
SSL_set_accept_state(conn->ssl);
if (data->tls_session_lifetime == 0) {
/*
* Set session id context to a unique value to make sure
* session resumption cannot be used either through session
* caching or TLS ticket extension.
*/
counter++;
SSL_set_session_id_context(conn->ssl,
(const unsigned char *) &counter,
sizeof(counter));
} else if (session_ctx) {
SSL_set_session_id_context(conn->ssl, session_ctx,
session_ctx_len);
}
return 0;
}
static int tls_connection_client_cert(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;
#ifdef PKCS12_FUNCS
#if OPENSSL_VERSION_NUMBER < 0x10002000L || defined(LIBRESSL_VERSION_NUMBER)
/*
* Clear previously set extra chain certificates, if any, from PKCS#12
* processing in tls_parse_pkcs12() to allow OpenSSL to build a new
* chain properly.
*/
SSL_CTX_clear_extra_chain_certs(conn->ssl_ctx);
#endif /* OPENSSL_VERSION_NUMBER < 0x10002000L */
#endif /* PKCS12_FUNCS */
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;
#ifdef ANDROID
if (os_strncmp("keystore://", client_cert, 11) == 0) {
BIO *bio = BIO_from_keystore(&client_cert[11]);
X509 *x509 = NULL;
int ret = -1;
if (bio) {
x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
}
if (x509) {
if (SSL_use_certificate(conn->ssl, x509) == 1)
ret = 0;
X509_free(x509);
}
/* Read additional certificates into the chain. */
while (bio) {
x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
if (x509) {
/* Takes ownership of x509 */
SSL_add0_chain_cert(conn->ssl, x509);
} else {
BIO_free(bio);
bio = NULL;
}
}
return ret;
}
#endif /* ANDROID */
#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;
}
if (SSL_use_certificate_file(conn->ssl, client_cert,
SSL_FILETYPE_PEM) == 1) {
ERR_clear_error();
wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
" --> OK");
return 0;
}
tls_show_errors(MSG_DEBUG, __func__,
"SSL_use_certificate_file failed");
#else /* OPENSSL_NO_STDIO */
wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
#endif /* OPENSSL_NO_STDIO */
return -1;
}
static int tls_global_client_cert(struct tls_data *data,
const char *client_cert)
{
#ifndef OPENSSL_NO_STDIO
SSL_CTX *ssl_ctx = data->ssl;
if (client_cert == NULL)
return 0;
if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
SSL_FILETYPE_ASN1) != 1 &&
SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 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;
}
os_strlcpy(buf, (char *) password, size);
return os_strlen(buf);
}
#ifdef PKCS12_FUNCS
static int tls_parse_pkcs12(struct tls_data *data, 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 (!passwd)
passwd = "";
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(data->ssl, 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(data->ssl, pkey) != 1)
res = -1;
}
EVP_PKEY_free(pkey);
}
if (certs) {
#if OPENSSL_VERSION_NUMBER >= 0x10002000L && !defined(LIBRESSL_VERSION_NUMBER)
if (ssl)
SSL_clear_chain_certs(ssl);
else
SSL_CTX_clear_chain_certs(data->ssl);
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);
if ((ssl && SSL_add1_chain_cert(ssl, cert) != 1) ||
(!ssl && SSL_CTX_add1_chain_cert(data->ssl,
cert) != 1)) {
tls_show_errors(MSG_DEBUG, __func__,
"Failed to add additional certificate");
res = -1;
X509_free(cert);
break;
}
X509_free(cert);
}
if (!res) {
/* Try to continue anyway */
}
sk_X509_pop_free(certs, X509_free);
#ifndef OPENSSL_IS_BORINGSSL
if (ssl)
res = SSL_build_cert_chain(
ssl,
SSL_BUILD_CHAIN_FLAG_CHECK |
SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
else
res = SSL_CTX_build_cert_chain(
data->ssl,
SSL_BUILD_CHAIN_FLAG_CHECK |
SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
if (!res) {
tls_show_errors(MSG_DEBUG, __func__,
"Failed to build certificate chain");
} else if (res == 2) {
wpa_printf(MSG_DEBUG,
"TLS: Ignore certificate chain verification error when building chain with PKCS#12 extra certificates");
}
#endif /* OPENSSL_IS_BORINGSSL */
/*
* Try to continue regardless of result since it is possible for
* the extra certificates not to be required.
*/
res = 0;
#else /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
SSL_CTX_clear_extra_chain_certs(data->ssl);
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(data->ssl, cert) != 1)
{
X509_free(cert);
res = -1;
break;
}
}
sk_X509_pop_free(certs, X509_free);
#endif /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
}
PKCS12_free(p12);
if (res < 0)
tls_get_errors(data);
return res;
}
#endif /* PKCS12_FUNCS */
static int tls_read_pkcs12(struct tls_data *data, SSL *ssl,
const char *private_key, const char *passwd)
{
#ifdef PKCS12_FUNCS
FILE *f;
PKCS12 *p12;
f = fopen(private_key, "rb");
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(data, 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(struct tls_data *data, SSL *ssl,
const u8 *blob, size_t len, const char *passwd)
{
#ifdef PKCS12_FUNCS
PKCS12 *p12;
p12 = d2i_PKCS12(NULL, (const unsigned char **) &blob, len);
if (p12 == NULL) {
tls_show_errors(MSG_INFO, __func__,
"Failed to use PKCS#12 blob");
return -1;
}
return tls_parse_pkcs12(data, ssl, p12, passwd);
#else /* PKCS12_FUNCS */
wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
"p12/pfx blobs");
return -1;
#endif /* PKCS12_FUNCS */
}
#ifndef OPENSSL_NO_ENGINE
static int tls_engine_get_cert(struct tls_connection *conn,
const char *cert_id,
X509 **cert)
{
/* this runs after the private key is loaded so no PIN is required */
struct {
const char *cert_id;
X509 *cert;
} params;
params.cert_id = cert_id;
params.cert = NULL;
if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
0, &params, NULL, 1)) {
unsigned long err = ERR_get_error();
wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
" '%s' [%s]", cert_id,
ERR_error_string(err, NULL));
if (tls_is_pin_error(err))
return TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
}
if (!params.cert) {
wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
" '%s'", cert_id);
return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
}
*cert = params.cert;
return 0;
}
#endif /* OPENSSL_NO_ENGINE */
static int tls_connection_engine_client_cert(struct tls_connection *conn,
const char *cert_id)
{
#ifndef OPENSSL_NO_ENGINE
X509 *cert;
if (tls_engine_get_cert(conn, cert_id, &cert))
return -1;
if (!SSL_use_certificate(conn->ssl, cert)) {
tls_show_errors(MSG_ERROR, __func__,
"SSL_use_certificate failed");
X509_free(cert);
return -1;
}
X509_free(cert);
wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
"OK");
return 0;
#else /* OPENSSL_NO_ENGINE */
return -1;
#endif /* OPENSSL_NO_ENGINE */
}
static int tls_connection_engine_ca_cert(struct tls_data *data,
struct tls_connection *conn,
const char *ca_cert_id)
{
#ifndef OPENSSL_NO_ENGINE
X509 *cert;
SSL_CTX *ssl_ctx = data->ssl;
X509_STORE *store;
if (tls_engine_get_cert(conn, ca_cert_id, &cert))
return -1;
/* start off the same as tls_connection_ca_cert */
store = X509_STORE_new();
if (store == NULL) {
wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
"certificate store", __func__);
X509_free(cert);
return -1;
}
SSL_CTX_set_cert_store(ssl_ctx, store);
if (!X509_STORE_add_cert(store, cert)) {
unsigned long err = ERR_peek_error();
tls_show_errors(MSG_WARNING, __func__,
"Failed to add CA certificate from engine "
"to certificate store");
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 {
X509_free(cert);
return -1;
}
}
X509_free(cert);
wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
"to certificate store", __func__);
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
conn->ca_cert_verify = 1;
return 0;
#else /* OPENSSL_NO_ENGINE */
return -1;
#endif /* OPENSSL_NO_ENGINE */
}
static int tls_connection_engine_private_key(struct tls_connection *conn)
{
#if defined(ANDROID) || !defined(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(struct tls_data *data,
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 = data->ssl;
char *passwd;
int ok;
if (private_key == NULL && private_key_blob == NULL)
return 0;
if (private_key_passwd) {
passwd = os_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;
}
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;
}
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;
}
if (tls_read_pkcs12_blob(data, 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;
}
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 /* OPENSSL_NO_STDIO */
wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
__func__);
#endif /* OPENSSL_NO_STDIO */
if (tls_read_pkcs12(data, 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) {
tls_show_errors(MSG_INFO, __func__,
"Failed to load private key");
os_free(passwd);
return -1;
}
ERR_clear_error();
SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
os_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;
}
static int tls_global_private_key(struct tls_data *data,
const char *private_key,
const char *private_key_passwd)
{
SSL_CTX *ssl_ctx = data->ssl;
char *passwd;
if (private_key == NULL)
return 0;
if (private_key_passwd) {
passwd = os_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(data, NULL, private_key, passwd)) {
tls_show_errors(MSG_INFO, __func__,
"Failed to load private key");
os_free(passwd);
ERR_clear_error();
return -1;
}
os_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(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 */
}
static int tls_global_dh(struct tls_data *data, 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 */
SSL_CTX *ssl_ctx = data->ssl;
DH *dh;
BIO *bio;
/* TODO: add support for dh_blob */
if (dh_file == NULL)
return 0;
if (ssl_ctx == 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_CTX_set_tmp_dh(ssl_ctx, 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_random(void *ssl_ctx, struct tls_connection *conn,
struct tls_random *keys)
{
SSL *ssl;
if (conn == NULL || keys == NULL)
return -1;
ssl = conn->ssl;
if (ssl == NULL)
return -1;
os_memset(keys, 0, sizeof(*keys));
keys->client_random = conn->client_random;
keys->client_random_len = SSL_get_client_random(
ssl, conn->client_random, sizeof(conn->client_random));
keys->server_random = conn->server_random;
keys->server_random_len = SSL_get_server_random(
ssl, conn->server_random, sizeof(conn->server_random));
return 0;
}
#ifdef OPENSSL_NEED_EAP_FAST_PRF
static int openssl_get_keyblock_size(SSL *ssl)
{
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
const EVP_CIPHER *c;
const EVP_MD *h;
int md_size;
if (ssl->enc_read_ctx == NULL || ssl->enc_read_ctx->cipher == NULL ||
ssl->read_hash == NULL)
return -1;
c = ssl->enc_read_ctx->cipher;
h = EVP_MD_CTX_md(ssl->read_hash);
if (h)
md_size = EVP_MD_size(h);
else if (ssl->s3)
md_size = ssl->s3->tmp.new_mac_secret_size;
else
return -1;
wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
"IV_len=%d", EVP_CIPHER_key_length(c), md_size,
EVP_CIPHER_iv_length(c));
return 2 * (EVP_CIPHER_key_length(c) +
md_size +
EVP_CIPHER_iv_length(c));
#else
const SSL_CIPHER *ssl_cipher;
int cipher, digest;
const EVP_CIPHER *c;
const EVP_MD *h;
ssl_cipher = SSL_get_current_cipher(ssl);
if (!ssl_cipher)
return -1;
cipher = SSL_CIPHER_get_cipher_nid(ssl_cipher);
digest = SSL_CIPHER_get_digest_nid(ssl_cipher);
wpa_printf(MSG_DEBUG, "OpenSSL: cipher nid %d digest nid %d",
cipher, digest);
if (cipher < 0 || digest < 0)
return -1;
c = EVP_get_cipherbynid(cipher);
h = EVP_get_digestbynid(digest);
if (!c || !h)
return -1;
wpa_printf(MSG_DEBUG,
"OpenSSL: keyblock size: key_len=%d MD_size=%d IV_len=%d",
EVP_CIPHER_key_length(c), EVP_MD_size(h),
EVP_CIPHER_iv_length(c));
return 2 * (EVP_CIPHER_key_length(c) + EVP_MD_size(h) +
EVP_CIPHER_iv_length(c));
#endif
}
#endif /* OPENSSL_NEED_EAP_FAST_PRF */
int tls_connection_export_key(void *tls_ctx, struct tls_connection *conn,
const char *label, u8 *out, size_t out_len)
{
if (!conn ||
SSL_export_keying_material(conn->ssl, out, out_len, label,
os_strlen(label), NULL, 0, 0) != 1)
return -1;
return 0;
}
int tls_connection_get_eap_fast_key(void *tls_ctx, struct tls_connection *conn,
u8 *out, size_t out_len)
{
#ifdef OPENSSL_NEED_EAP_FAST_PRF
SSL *ssl;
SSL_SESSION *sess;
u8 *rnd;
int ret = -1;
int skip = 0;
u8 *tmp_out = NULL;
u8 *_out = out;
unsigned char client_random[SSL3_RANDOM_SIZE];
unsigned char server_random[SSL3_RANDOM_SIZE];
unsigned char master_key[64];
size_t master_key_len;
const char *ver;
/*
* TLS library did not support EAP-FAST key generation, so get the
* needed TLS session parameters and use an internal implementation of
* TLS PRF to derive the key.
*/
if (conn == NULL)
return -1;
ssl = conn->ssl;
if (ssl == NULL)
return -1;
ver = SSL_get_version(ssl);
sess = SSL_get_session(ssl);
if (!ver || !sess)
return -1;
skip = openssl_get_keyblock_size(ssl);
if (skip < 0)
return -1;
tmp_out = os_malloc(skip + out_len);
if (!tmp_out)
return -1;
_out = tmp_out;
rnd = os_malloc(2 * SSL3_RANDOM_SIZE);
if (!rnd) {
os_free(tmp_out);
return -1;
}
SSL_get_client_random(ssl, client_random, sizeof(client_random));
SSL_get_server_random(ssl, server_random, sizeof(server_random));
master_key_len = SSL_SESSION_get_master_key(sess, master_key,
sizeof(master_key));
os_memcpy(rnd, server_random, SSL3_RANDOM_SIZE);
os_memcpy(rnd + SSL3_RANDOM_SIZE, client_random, SSL3_RANDOM_SIZE);
if (os_strcmp(ver, "TLSv1.2") == 0) {
tls_prf_sha256(master_key, master_key_len,
"key expansion", rnd, 2 * SSL3_RANDOM_SIZE,
_out, skip + out_len);
ret = 0;
} else if (tls_prf_sha1_md5(master_key, master_key_len,
"key expansion", rnd, 2 * SSL3_RANDOM_SIZE,
_out, skip + out_len) == 0) {
ret = 0;
}
os_memset(master_key, 0, sizeof(master_key));
os_free(rnd);
if (ret == 0)
os_memcpy(out, _out + skip, out_len);
bin_clear_free(tmp_out, skip);
return ret;
#else /* OPENSSL_NEED_EAP_FAST_PRF */
wpa_printf(MSG_ERROR,
"OpenSSL: EAP-FAST keys cannot be exported in FIPS mode");
return -1;
#endif /* OPENSSL_NEED_EAP_FAST_PRF */
}
static struct wpabuf *
openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
int server)
{
int res;
struct wpabuf *out_data;
/*
* Give TLS handshake data from the server (if available) to OpenSSL
* for processing.
*/
if (in_data && wpabuf_len(in_data) > 0 &&
BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
< 0) {
tls_show_errors(MSG_INFO, __func__,
"Handshake failed - BIO_write");
return NULL;
}
/* Initiate TLS handshake or continue the existing handshake */
if (server)
res = SSL_accept(conn->ssl);
else
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 = wpabuf_alloc(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");
}
return NULL;
}
res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(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");
}
wpabuf_free(out_data);
return NULL;
}
wpabuf_put(out_data, res);
return out_data;
}
static struct wpabuf *
openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
{
struct wpabuf *appl_data;
int res;
appl_data = wpabuf_alloc(max_len + 100);
if (appl_data == NULL)
return NULL;
res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
wpabuf_size(appl_data));
if (res < 0) {
int err = SSL_get_error(conn->ssl, res);
if (err == SSL_ERROR_WANT_READ ||
err == SSL_ERROR_WANT_WRITE) {
wpa_printf(MSG_DEBUG, "SSL: No Application Data "
"included");
} else {
tls_show_errors(MSG_INFO, __func__,
"Failed to read possible "
"Application Data");
}
wpabuf_free(appl_data);
return NULL;
}
wpabuf_put(appl_data, res);
wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
"message", appl_data);
return appl_data;
}
static struct wpabuf *
openssl_connection_handshake(struct tls_connection *conn,
const struct wpabuf *in_data,
struct wpabuf **appl_data, int server)
{
struct wpabuf *out_data;
if (appl_data)
*appl_data = NULL;
out_data = openssl_handshake(conn, in_data, server);
if (out_data == NULL)
return NULL;
if (conn->invalid_hb_used) {
wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
wpabuf_free(out_data);
return NULL;
}
if (SSL_is_init_finished(conn->ssl)) {
wpa_printf(MSG_DEBUG,
"OpenSSL: Handshake finished - resumed=%d",
tls_connection_resumed(conn->ssl_ctx, conn));
if (appl_data && in_data)
*appl_data = openssl_get_appl_data(conn,
wpabuf_len(in_data));
}
if (conn->invalid_hb_used) {
wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
if (appl_data) {
wpabuf_free(*appl_data);
*appl_data = NULL;
}
wpabuf_free(out_data);
return NULL;
}
return out_data;
}
struct wpabuf *
tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
const struct wpabuf *in_data,
struct wpabuf **appl_data)
{
return openssl_connection_handshake(conn, in_data, appl_data, 0);
}
struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
struct tls_connection *conn,
const struct wpabuf *in_data,
struct wpabuf **appl_data)
{
return openssl_connection_handshake(conn, in_data, appl_data, 1);
}
struct wpabuf * tls_connection_encrypt(void *tls_ctx,
struct tls_connection *conn,
const struct wpabuf *in_data)
{
int res;
struct wpabuf *buf;
if (conn == NULL)
return NULL;
/* 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 NULL;
}
res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Encryption failed - SSL_write");
return NULL;
}
/* Read encrypted data to be sent to the server */
buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
if (buf == NULL)
return NULL;
res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Encryption failed - BIO_read");
wpabuf_free(buf);
return NULL;
}
wpabuf_put(buf, res);
return buf;
}
struct wpabuf * tls_connection_decrypt(void *tls_ctx,
struct tls_connection *conn,
const struct wpabuf *in_data)
{
int res;
struct wpabuf *buf;
/* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
wpabuf_len(in_data));
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Decryption failed - BIO_write");
return NULL;
}
if (BIO_reset(conn->ssl_out) < 0) {
tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
return NULL;
}
/* Read decrypted data for further processing */
/*
* Even though we try to disable TLS compression, it is possible that
* this cannot be done with all TLS libraries. Add extra buffer space
* to handle the possibility of the decrypted data being longer than
* input data.
*/
buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
if (buf == NULL)
return NULL;
res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
if (res < 0) {
tls_show_errors(MSG_INFO, __func__,
"Decryption failed - SSL_read");
wpabuf_free(buf);
return NULL;
}
wpabuf_put(buf, res);
if (conn->invalid_hb_used) {
wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
wpabuf_free(buf);
return NULL;
}
return buf;
}
int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
{
return conn ? SSL_cache_hit(conn->ssl) : 0;
}
int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
u8 *ciphers)
{
char buf[500], *pos, *end;
u8 *c;
int ret;
if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
return -1;
buf[0] = '\0';
pos = buf;
end = pos + sizeof(buf);
c = ciphers;
while (*c != TLS_CIPHER_NONE) {
const char *suite;
switch (*c) {
case TLS_CIPHER_RC4_SHA:
suite = "RC4-SHA";
break;
case TLS_CIPHER_AES128_SHA:
suite = "AES128-SHA";
break;
case TLS_CIPHER_RSA_DHE_AES128_SHA:
suite = "DHE-RSA-AES128-SHA";
break;
case TLS_CIPHER_ANON_DH_AES128_SHA:
suite = "ADH-AES128-SHA";
break;
case TLS_CIPHER_RSA_DHE_AES256_SHA:
suite = "DHE-RSA-AES256-SHA";
break;
case TLS_CIPHER_AES256_SHA:
suite = "AES256-SHA";
break;
default:
wpa_printf(MSG_DEBUG, "TLS: Unsupported "
"cipher selection: %d", *c);
return -1;
}
ret = os_snprintf(pos, end - pos, ":%s", suite);
if (os_snprintf_error(end - pos, ret))
break;
pos += ret;
c++;
}
wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
if (os_strstr(buf, ":ADH-")) {
/*
* Need to drop to security level 0 to allow anonymous
* cipher suites for EAP-FAST.
*/
SSL_set_security_level(conn->ssl, 0);
} else if (SSL_get_security_level(conn->ssl) == 0) {
/* Force at least security level 1 */
SSL_set_security_level(conn->ssl, 1);
}
#endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
#endif
if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
tls_show_errors(MSG_INFO, __func__,
"Cipher suite configuration failed");
return -1;
}
return 0;
}
int tls_get_version(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_version(conn->ssl);
if (name == NULL)
return -1;
os_strlcpy(buf, name, buflen);
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;
os_strlcpy(buf, name, buflen);
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;
}
#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_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 || ext_type != 35)
return -1;
if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
data_len) != 1)
return -1;
return 0;
}
#endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_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;
}
#ifdef HAVE_OCSP
static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp)
{
#ifndef CONFIG_NO_STDOUT_DEBUG
BIO *out;
size_t rlen;
char *txt;
int res;
if (wpa_debug_level > MSG_DEBUG)
return;
out = BIO_new(BIO_s_mem());
if (!out)
return;
OCSP_RESPONSE_print(out, rsp, 0);
rlen = BIO_ctrl_pending(out);
txt = os_malloc(rlen + 1);
if (!txt) {
BIO_free(out);
return;
}
res = BIO_read(out, txt, rlen);
if (res > 0) {
txt[res] = '\0';
wpa_printf(MSG_DEBUG, "OpenSSL: OCSP Response\n%s", txt);
}
os_free(txt);
BIO_free(out);
#endif /* CONFIG_NO_STDOUT_DEBUG */
}
static void debug_print_cert(X509 *cert, const char *title)
{
#ifndef CONFIG_NO_STDOUT_DEBUG
BIO *out;
size_t rlen;
char *txt;
int res;
if (wpa_debug_level > MSG_DEBUG)
return;
out = BIO_new(BIO_s_mem());
if (!out)
return;
X509_print(out, cert);
rlen = BIO_ctrl_pending(out);
txt = os_malloc(rlen + 1);
if (!txt) {
BIO_free(out);
return;
}
res = BIO_read(out, txt, rlen);
if (res > 0) {
txt[res] = '\0';
wpa_printf(MSG_DEBUG, "OpenSSL: %s\n%s", title, txt);
}
os_free(txt);
BIO_free(out);
#endif /* CONFIG_NO_STDOUT_DEBUG */
}
static int ocsp_resp_cb(SSL *s, void *arg)
{
struct tls_connection *conn = arg;
const unsigned char *p;
int len, status, reason;
OCSP_RESPONSE *rsp;
OCSP_BASICRESP *basic;
OCSP_CERTID *id;
ASN1_GENERALIZEDTIME *produced_at, *this_update, *next_update;
X509_STORE *store;
STACK_OF(X509) *certs = NULL;
len = SSL_get_tlsext_status_ocsp_resp(s, &p);
if (!p) {
wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received");
return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
}
wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", p, len);
rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
if (!rsp) {
wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSP response");
return 0;
}
ocsp_debug_print_resp(rsp);
status = OCSP_response_status(rsp);
if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d (%s)",
status, OCSP_response_status_str(status));
return 0;
}
basic = OCSP_response_get1_basic(rsp);
if (!basic) {
wpa_printf(MSG_INFO, "OpenSSL: Could not find BasicOCSPResponse");
return 0;
}
store = SSL_CTX_get_cert_store(conn->ssl_ctx);
if (conn->peer_issuer) {
debug_print_cert(conn->peer_issuer, "Add OCSP issuer");
if (X509_STORE_add_cert(store, conn->peer_issuer) != 1) {
tls_show_errors(MSG_INFO, __func__,
"OpenSSL: Could not add issuer to certificate store");
}
certs = sk_X509_new_null();
if (certs) {
X509 *cert;
cert = X509_dup(conn->peer_issuer);
if (cert && !sk_X509_push(certs, cert)) {
tls_show_errors(
MSG_INFO, __func__,
"OpenSSL: Could not add issuer to OCSP responder trust store");
X509_free(cert);
sk_X509_free(certs);
certs = NULL;
}
if (certs && conn->peer_issuer_issuer) {
cert = X509_dup(conn->peer_issuer_issuer);
if (cert && !sk_X509_push(certs, cert)) {
tls_show_errors(
MSG_INFO, __func__,
"OpenSSL: Could not add issuer's issuer to OCSP responder trust store");
X509_free(cert);
}
}
}
}
status = OCSP_basic_verify(basic, certs, store, OCSP_TRUSTOTHER);
sk_X509_pop_free(certs, X509_free);
if (status <= 0) {
tls_show_errors(MSG_INFO, __func__,
"OpenSSL: OCSP response failed verification");
OCSP_BASICRESP_free(basic);
OCSP_RESPONSE_free(rsp);
return 0;
}
wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response verification succeeded");
if (!conn->peer_cert) {
wpa_printf(MSG_DEBUG, "OpenSSL: Peer certificate not available for OCSP status check");
OCSP_BASICRESP_free(basic);
OCSP_RESPONSE_free(rsp);
return 0;
}
if (!conn->peer_issuer) {
wpa_printf(MSG_DEBUG, "OpenSSL: Peer issuer certificate not available for OCSP status check");
OCSP_BASICRESP_free(basic);
OCSP_RESPONSE_free(rsp);
return 0;
}
id = OCSP_cert_to_id(NULL, conn->peer_cert, conn->peer_issuer);
if (!id) {
wpa_printf(MSG_DEBUG, "OpenSSL: Could not create OCSP certificate identifier");
OCSP_BASICRESP_free(basic);
OCSP_RESPONSE_free(rsp);
return 0;
}
if (!OCSP_resp_find_status(basic, id, &status, &reason, &produced_at,
&this_update, &next_update)) {
wpa_printf(MSG_INFO, "OpenSSL: Could not find current server certificate from OCSP response%s",
(conn->flags & TLS_CONN_REQUIRE_OCSP) ? "" :
" (OCSP not required)");
OCSP_CERTID_free(id);
OCSP_BASICRESP_free(basic);
OCSP_RESPONSE_free(rsp);
return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
}
OCSP_CERTID_free(id);
if (!OCSP_check_validity(this_update, next_update, 5 * 60, -1)) {
tls_show_errors(MSG_INFO, __func__,
"OpenSSL: OCSP status times invalid");
OCSP_BASICRESP_free(basic);
OCSP_RESPONSE_free(rsp);
return 0;
}
OCSP_BASICRESP_free(basic);
OCSP_RESPONSE_free(rsp);
wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status for server certificate: %s",
OCSP_cert_status_str(status));
if (status == V_OCSP_CERTSTATUS_GOOD)
return 1;
if (status == V_OCSP_CERTSTATUS_REVOKED)
return 0;
if (conn->flags & TLS_CONN_REQUIRE_OCSP) {
wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP required");
return 0;
}
wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP was not required, so allow connection to continue");
return 1;
}
static int ocsp_status_cb(SSL *s, void *arg)
{
char *tmp;
char *resp;
size_t len;
if (tls_global->ocsp_stapling_response == NULL) {
wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - no response configured");
return SSL_TLSEXT_ERR_OK;
}
resp = os_readfile(tls_global->ocsp_stapling_response, &len);
if (resp == NULL) {
wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - could not read response file");
/* TODO: Build OCSPResponse with responseStatus = internalError
*/
return SSL_TLSEXT_ERR_OK;
}
wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - send cached response");
tmp = OPENSSL_malloc(len);
if (tmp == NULL) {
os_free(resp);
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
os_memcpy(tmp, resp, len);
os_free(resp);
SSL_set_tlsext_status_ocsp_resp(s, tmp, len);
return SSL_TLSEXT_ERR_OK;
}
#endif /* HAVE_OCSP */
int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
const struct tls_connection_params *params)
{
struct tls_data *data = tls_ctx;
int ret;
unsigned long err;
int can_pkcs11 = 0;
const char *key_id = params->key_id;
const char *cert_id = params->cert_id;
const char *ca_cert_id = params->ca_cert_id;
const char *engine_id = params->engine ? params->engine_id : NULL;
if (conn == NULL)
return -1;
if (params->flags & TLS_CONN_REQUIRE_OCSP_ALL) {
wpa_printf(MSG_INFO,
"OpenSSL: ocsp=3 not supported");
return -1;
}
/*
* If the engine isn't explicitly configured, and any of the
* cert/key fields are actually PKCS#11 URIs, then automatically
* use the PKCS#11 ENGINE.
*/
if (!engine_id || os_strcmp(engine_id, "pkcs11") == 0)
can_pkcs11 = 1;
if (!key_id && params->private_key && can_pkcs11 &&
os_strncmp(params->private_key, "pkcs11:", 7) == 0) {
can_pkcs11 = 2;
key_id = params->private_key;
}
if (!cert_id && params->client_cert && can_pkcs11 &&
os_strncmp(params->client_cert, "pkcs11:", 7) == 0) {
can_pkcs11 = 2;
cert_id = params->client_cert;
}
if (!ca_cert_id && params->ca_cert && can_pkcs11 &&
os_strncmp(params->ca_cert, "pkcs11:", 7) == 0) {
can_pkcs11 = 2;
ca_cert_id = params->ca_cert;
}
/* If we need to automatically enable the PKCS#11 ENGINE, do so. */
if (can_pkcs11 == 2 && !engine_id)
engine_id = "pkcs11";
#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
if (params->flags & TLS_CONN_EAP_FAST) {
wpa_printf(MSG_DEBUG,
"OpenSSL: Use TLSv1_method() for EAP-FAST");
if (SSL_set_ssl_method(conn->ssl, TLSv1_method()) != 1) {
tls_show_errors(MSG_INFO, __func__,
"Failed to set TLSv1_method() for EAP-FAST");
return -1;
}
}
#endif
#endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
while ((err = ERR_get_error())) {
wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
__func__, ERR_error_string(err, NULL));
}
if (engine_id) {
wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
ret = tls_engine_init(conn, engine_id, params->pin,
key_id, cert_id, ca_cert_id);
if (ret)
return ret;
}
if (tls_connection_set_subject_match(conn,
params->subject_match,
params->altsubject_match,
params->suffix_match,
params->domain_match))
return -1;
if (engine_id && ca_cert_id) {
if (tls_connection_engine_ca_cert(data, conn, ca_cert_id))
return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
} else if (tls_connection_ca_cert(data, conn, params->ca_cert,
params->ca_cert_blob,
params->ca_cert_blob_len,
params->ca_path))
return -1;
if (engine_id && cert_id) {
if (tls_connection_engine_client_cert(conn, cert_id))
return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
} else if (tls_connection_client_cert(conn, params->client_cert,
params->client_cert_blob,
params->client_cert_blob_len))
return -1;
if (engine_id && key_id) {
wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
if (tls_connection_engine_private_key(conn))
return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
} else if (tls_connection_private_key(data, 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(conn, params->dh_file)) {
wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
params->dh_file);
return -1;
}
if (params->openssl_ciphers &&
SSL_set_cipher_list(conn->ssl, params->openssl_ciphers) != 1) {
wpa_printf(MSG_INFO,
"OpenSSL: Failed to set cipher string '%s'",
params->openssl_ciphers);
return -1;
}
tls_set_conn_flags(conn->ssl, params->flags);
#ifdef OPENSSL_IS_BORINGSSL
if (params->flags & TLS_CONN_REQUEST_OCSP) {
SSL_enable_ocsp_stapling(conn->ssl);
}
#else /* OPENSSL_IS_BORINGSSL */
#ifdef HAVE_OCSP
if (params->flags & TLS_CONN_REQUEST_OCSP) {
SSL_CTX *ssl_ctx = data->ssl;
SSL_set_tlsext_status_type(conn->ssl, TLSEXT_STATUSTYPE_ocsp);
SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb);
SSL_CTX_set_tlsext_status_arg(ssl_ctx, conn);
}
#else /* HAVE_OCSP */
if (params->flags & TLS_CONN_REQUIRE_OCSP) {
wpa_printf(MSG_INFO,
"OpenSSL: No OCSP support included - reject configuration");
return -1;
}
if (params->flags & TLS_CONN_REQUEST_OCSP) {
wpa_printf(MSG_DEBUG,
"OpenSSL: No OCSP support included - allow optional OCSP case to continue");
}
#endif /* HAVE_OCSP */
#endif /* OPENSSL_IS_BORINGSSL */
conn->flags = params->flags;
tls_get_errors(data);
return 0;
}
int tls_global_set_params(void *tls_ctx,
const struct tls_connection_params *params)
{
struct tls_data *data = tls_ctx;
SSL_CTX *ssl_ctx = data->ssl;
unsigned long err;
while ((err = ERR_get_error())) {
wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
__func__, ERR_error_string(err, NULL));
}
if (tls_global_ca_cert(data, params->ca_cert) ||
tls_global_client_cert(data, params->client_cert) ||
tls_global_private_key(data, params->private_key,
params->private_key_passwd) ||
tls_global_dh(data, params->dh_file)) {
wpa_printf(MSG_INFO, "TLS: Failed to set global parameters");
return -1;
}
if (params->openssl_ciphers &&
SSL_CTX_set_cipher_list(ssl_ctx, params->openssl_ciphers) != 1) {
wpa_printf(MSG_INFO,
"OpenSSL: Failed to set cipher string '%s'",
params->openssl_ciphers);
return -1;
}
#ifdef SSL_OP_NO_TICKET
if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
else
SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET);
#endif /* SSL_OP_NO_TICKET */
#ifdef HAVE_OCSP
SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_status_cb);
SSL_CTX_set_tlsext_status_arg(ssl_ctx, ssl_ctx);
os_free(tls_global->ocsp_stapling_response);
if (params->ocsp_stapling_response)
tls_global->ocsp_stapling_response =
os_strdup(params->ocsp_stapling_response);
else
tls_global->ocsp_stapling_response = NULL;
#endif /* HAVE_OCSP */
return 0;
}
#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_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. */
#if (defined(OPENSSL_IS_BORINGSSL) || OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
STACK_OF(SSL_CIPHER) *peer_ciphers,
const SSL_CIPHER **cipher, void *arg)
#else /* OPENSSL_IS_BORINGSSL */
static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
STACK_OF(SSL_CIPHER) *peer_ciphers,
SSL_CIPHER **cipher, void *arg)
#endif /* OPENSSL_IS_BORINGSSL */
{
struct tls_connection *conn = arg;
int ret;
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
if (conn == NULL || conn->session_ticket_cb == NULL)
return 0;
ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
conn->session_ticket,
conn->session_ticket_len,
s->s3->client_random,
s->s3->server_random, secret);
#else
unsigned char client_random[SSL3_RANDOM_SIZE];
unsigned char server_random[SSL3_RANDOM_SIZE];
if (conn == NULL || conn->session_ticket_cb == NULL)
return 0;
SSL_get_client_random(s, client_random, sizeof(client_random));
SSL_get_server_random(s, server_random, sizeof(server_random));
ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
conn->session_ticket,
conn->session_ticket_len,
client_random,
server_random, secret);
#endif
os_free(conn->session_ticket);
conn->session_ticket = NULL;
if (ret <= 0)
return 0;
*secret_len = SSL_MAX_MASTER_KEY_LENGTH;
return 1;
}
static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
int len, void *arg)
{
struct tls_connection *conn = arg;
if (conn == NULL || conn->session_ticket_cb == NULL)
return 0;
wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
os_free(conn->session_ticket);
conn->session_ticket = NULL;
wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
"extension", data, len);
conn->session_ticket = os_memdup(data, len);
if (conn->session_ticket == NULL)
return 0;
conn->session_ticket_len = len;
return 1;
}
#endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
int tls_connection_set_session_ticket_cb(void *tls_ctx,
struct tls_connection *conn,
tls_session_ticket_cb cb,
void *ctx)
{
#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
conn->session_ticket_cb = cb;
conn->session_ticket_cb_ctx = ctx;
if (cb) {
if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
conn) != 1)
return -1;
SSL_set_session_ticket_ext_cb(conn->ssl,
tls_session_ticket_ext_cb, conn);
} else {
if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
return -1;
SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
}
return 0;
#else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
return -1;
#endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
}
int tls_get_library_version(char *buf, size_t buf_len)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
OPENSSL_VERSION_TEXT,
OpenSSL_version(OPENSSL_VERSION));
#else
return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
OPENSSL_VERSION_TEXT,
SSLeay_version(SSLEAY_VERSION));
#endif
}
void tls_connection_set_success_data(struct tls_connection *conn,
struct wpabuf *data)
{
SSL_SESSION *sess;
struct wpabuf *old;
if (tls_ex_idx_session < 0)
goto fail;
sess = SSL_get_session(conn->ssl);
if (!sess)
goto fail;
old = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
if (old) {
wpa_printf(MSG_DEBUG, "OpenSSL: Replacing old success data %p",
old);
wpabuf_free(old);
}
if (SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1)
goto fail;
wpa_printf(MSG_DEBUG, "OpenSSL: Stored success data %p", data);
conn->success_data = 1;
return;
fail:
wpa_printf(MSG_INFO, "OpenSSL: Failed to store success data");
wpabuf_free(data);
}
void tls_connection_set_success_data_resumed(struct tls_connection *conn)
{
wpa_printf(MSG_DEBUG,
"OpenSSL: Success data accepted for resumed session");
conn->success_data = 1;
}
const struct wpabuf *
tls_connection_get_success_data(struct tls_connection *conn)
{
SSL_SESSION *sess;
if (tls_ex_idx_session < 0 ||
!(sess = SSL_get_session(conn->ssl)))
return NULL;
return SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
}
void tls_connection_remove_session(struct tls_connection *conn)
{
SSL_SESSION *sess;
sess = SSL_get_session(conn->ssl);
if (!sess)
return;
if (SSL_CTX_remove_session(conn->ssl_ctx, sess) != 1)
wpa_printf(MSG_DEBUG,
"OpenSSL: Session was not cached");
else
wpa_printf(MSG_DEBUG,
"OpenSSL: Removed cached session to disable session resumption");
}
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