blob: 7243d9fb95716d8bd7ddd74175a82ac425710eff [file] [log] [blame]
/*
* 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
#if OPENSSL_VERSION_NUMBER < 0x10100000L
#ifdef CONFIG_SUITEB
static int RSA_bits(const RSA *r)
{
return BN_num_bits(r->n);
}
#endif /* CONFIG_SUITEB */
#endif
#ifdef ANDROID
#include <openssl/pem.h>
#include <keystore/keystore_get.h>
#include <log/log.h>
#include <log/log_event_list.h>
#define CERT_VALIDATION_FAILURE 210033
static void log_cert_validation_failure(const char *reason)
{
android_log_context ctx = create_android_logger(CERT_VALIDATION_FAILURE);
android_log_write_string8(ctx, reason);
android_log_write_list(ctx, LOG_ID_SECURITY);
android_log_destroy(&ctx);
}
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];
u16 cipher_suite;
int server_dh_prime_len;
};
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 = TLS_DEFAULT_CIPHERS;
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 "?";
}
}
#ifdef CONFIG_SUITEB
static void check_server_hello(struct tls_connection *conn,
const u8 *pos, const u8 *end)
{
size_t payload_len, id_len;
/*
* Parse ServerHello to get the selected cipher suite since OpenSSL does
* not make it cleanly available during handshake and we need to know
* whether DHE was selected.
*/
if (end - pos < 3)
return;
payload_len = WPA_GET_BE24(pos);
pos += 3;
if ((size_t) (end - pos) < payload_len)
return;
end = pos + payload_len;
/* Skip Version and Random */
if (end - pos < 2 + SSL3_RANDOM_SIZE)
return;
pos += 2 + SSL3_RANDOM_SIZE;
/* Skip Session ID */
if (end - pos < 1)
return;
id_len = *pos++;
if ((size_t) (end - pos) < id_len)
return;
pos += id_len;
if (end - pos < 2)
return;
conn->cipher_suite = WPA_GET_BE16(pos);
wpa_printf(MSG_DEBUG, "OpenSSL: Server selected cipher suite 0x%x",
conn->cipher_suite);
}
static void check_server_key_exchange(SSL *ssl, struct tls_connection *conn,
const u8 *pos, const u8 *end)
{
size_t payload_len;
u16 dh_len;
BIGNUM *p;
int bits;
if (!(conn->flags & TLS_CONN_SUITEB))
return;
/* DHE is enabled only with DHE-RSA-AES256-GCM-SHA384 */
if (conn->cipher_suite != 0x9f)
return;
if (end - pos < 3)
return;
payload_len = WPA_GET_BE24(pos);
pos += 3;
if ((size_t) (end - pos) < payload_len)
return;
end = pos + payload_len;
if (end - pos < 2)
return;
dh_len = WPA_GET_BE16(pos);
pos += 2;
if ((size_t) (end - pos) < dh_len)
return;
p = BN_bin2bn(pos, dh_len, NULL);
if (!p)
return;
bits = BN_num_bits(p);
BN_free(p);
conn->server_dh_prime_len = bits;
wpa_printf(MSG_DEBUG, "OpenSSL: Server DH prime length: %d bits",
conn->server_dh_prime_len);
}
#endif /* CONFIG_SUITEB */
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;
}
}
#ifdef CONFIG_SUITEB
/*
* Need to parse these handshake messages to be able to check DH prime
* length since OpenSSL does not expose the new cipher suite and DH
* parameters during handshake (e.g., for cert_cb() callback).
*/
if (content_type == 22 && pos && len > 0 && pos[0] == 2)
check_server_hello(conn, pos + 1, pos + len);
if (content_type == 22 && pos && len > 0 && pos[0] == 12)
check_server_key_exchange(ssl, conn, pos + 1, pos + len);
#endif /* CONFIG_SUITEB */
}
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;
#ifdef ANDROID
log_cert_validation_failure(err_str);
#endif
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 CONFIG_SUITEB
if (conn->flags & TLS_CONN_SUITEB) {
EVP_PKEY *pk;
RSA *rsa;
int len = -1;
pk = X509_get_pubkey(err_cert);
if (pk) {
rsa = EVP_PKEY_get1_RSA(pk);
if (rsa) {
len = RSA_bits(rsa);
RSA_free(rsa);
}
EVP_PKEY_free(pk);
}
if (len >= 0) {
wpa_printf(MSG_DEBUG,
"OpenSSL: RSA modulus size: %d bits", len);
if (len < 3072) {
preverify_ok = 0;
openssl_tls_fail_event(
conn, err_cert, err,
depth, buf,
"Insufficient RSA modulus size",
TLS_FAIL_INSUFFICIENT_KEY_LEN);
}
}
}
#endif /* CONFIG_SUITEB */
#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;
}
#ifdef CONFIG_SUITEB
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
static int suiteb_cert_cb(SSL *ssl, void *arg)
{
struct tls_connection *conn = arg;
/*
* This cert_cb() is not really the best location for doing a
* constraint check for the ServerKeyExchange message, but this seems to
* be the only place where the current OpenSSL sequence can be
* terminated cleanly with an TLS alert going out to the server.
*/
if (!(conn->flags & TLS_CONN_SUITEB))
return 1;
/* DHE is enabled only with DHE-RSA-AES256-GCM-SHA384 */
if (conn->cipher_suite != 0x9f)
return 1;
if (conn->server_dh_prime_len >= 3072)
return 1;
wpa_printf(MSG_DEBUG,
"OpenSSL: Server DH prime length (%d bits) not sufficient for Suite B RSA - reject handshake",
conn->server_dh_prime_len);
return 0;
}
#endif /* OPENSSL_VERSION_NUMBER */
#endif /* CONFIG_SUITEB */
static int tls_set_conn_flags(struct tls_connection *conn, unsigned int flags)
{
SSL *ssl = conn->ssl;
#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 */
#ifdef CONFIG_SUITEB
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
if (flags & TLS_CONN_SUITEB_NO_ECDH) {
const char *ciphers = "DHE-RSA-AES256-GCM-SHA384";
if (SSL_set_cipher_list(ssl, ciphers) != 1) {
wpa_printf(MSG_INFO,
"OpenSSL: Failed to set Suite B ciphers");
return -1;
}
} else if (flags & TLS_CONN_SUITEB) {
EC_KEY *ecdh;
const char *ciphers =
"ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384";
if (SSL_set_cipher_list(ssl, ciphers) != 1) {
wpa_printf(MSG_INFO,
"OpenSSL: Failed to set Suite B ciphers");
return -1;
}
if (SSL_set1_curves_list(ssl, "P-384") != 1) {
wpa_printf(MSG_INFO,
"OpenSSL: Failed to set Suite B curves");
return -1;
}
ecdh = EC_KEY_new_by_curve_name(NID_secp384r1);
if (!ecdh || SSL_set_tmp_ecdh(ssl, ecdh) != 1) {
EC_KEY_free(ecdh);
wpa_printf(MSG_INFO,
"OpenSSL: Failed to set ECDH parameter");
return -1;
}
EC_KEY_free(ecdh);
}
if (flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) {
/* ECDSA+SHA384 if need to add EC support here */
if (SSL_set1_sigalgs_list(ssl, "RSA+SHA384") != 1) {
wpa_printf(MSG_INFO,
"OpenSSL: Failed to set Suite B sigalgs");
return -1;
}
SSL_set_options(ssl, SSL_OP_NO_TLSv1);
SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
SSL_set_cert_cb(ssl, suiteb_cert_cb, conn);
}
#else /* OPENSSL_VERSION_NUMBER < 0x10002000L */
if (flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) {
wpa_printf(MSG_ERROR,
"OpenSSL: Suite B RSA case not supported with this OpenSSL version");
return -1;
}
#endif /* OPENSSL_VERSION_NUMBER */
#endif /* CONFIG_SUITEB */
return 0;
}
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);
}
if (tls_set_conn_flags(conn, flags) < 0)
return -1;
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)