tls_openssl.c

hostapd源代码

				wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
					   "DER format CA certificate",
					   __func__);
			} else
				return -1;
		} else {
			wpa_printf(MSG_DEBUG, "TLS: Trusted root "
				   "certificate(s) loaded");
			tls_get_errors(ssl_ctx);
		}
		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
#else /* OPENSSL_NO_STDIO */
		wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
			   __func__);
		return -1;
#endif /* OPENSSL_NO_STDIO */
	} else {
		/* No ca_cert configured - do not try to verify server
		 * certificate */
		SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
	}

	return 0;
}


static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
{
	if (ca_cert) {
		if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
		{
			tls_show_errors(MSG_WARNING, __func__,
					"Failed to load root certificates");
			return -1;
		}

		wpa_printf(MSG_DEBUG, "TLS: Trusted root "
			   "certificate(s) loaded");

#ifndef OPENSSL_NO_STDIO
		/* Add the same CAs to the client certificate requests */
		SSL_CTX_set_client_CA_list(ssl_ctx,
					   SSL_load_client_CA_file(ca_cert));
#endif /* OPENSSL_NO_STDIO */
	}

	return 0;
}


int tls_global_set_verify(void *ssl_ctx, int check_crl)
{
	int flags;

	if (check_crl) {
		X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
		if (cs == NULL) {
			tls_show_errors(MSG_INFO, __func__, "Failed to get "
					"certificate store when enabling "
					"check_crl");
			return -1;
		}
		flags = X509_V_FLAG_CRL_CHECK;
		if (check_crl == 2)
			flags |= X509_V_FLAG_CRL_CHECK_ALL;
		X509_STORE_set_flags(cs, flags);
	}
	return 0;
}


static int tls_connection_set_subject_match(struct tls_connection *conn,
					    const char *subject_match,
					    const char *altsubject_match)
{
	free(conn->subject_match);
	conn->subject_match = NULL;
	if (subject_match) {
		conn->subject_match = strdup(subject_match);
		if (conn->subject_match == NULL)
			return -1;
	}

	free(conn->altsubject_match);
	conn->altsubject_match = NULL;
	if (altsubject_match) {
		conn->altsubject_match = strdup(altsubject_match);
		if (conn->altsubject_match == NULL)
			return -1;
	}

	return 0;
}


int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
			      int verify_peer)
{
	if (conn == NULL)
		return -1;

	if (verify_peer) {
		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
			       SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
			       SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
	} else {
		SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
	}

	SSL_set_accept_state(conn->ssl);

	return 0;
}


static int tls_connection_client_cert(struct tls_connection *conn,
				      const char *client_cert,
				      const u8 *client_cert_blob,
				      size_t client_cert_blob_len)
{
	if (client_cert == NULL && client_cert_blob == NULL)
		return 0;

	if (client_cert_blob &&
	    SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
				     client_cert_blob_len) == 1) {
		wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
			   "OK");
		return 0;
	} else if (client_cert_blob) {
		tls_show_errors(MSG_DEBUG, __func__,
				"SSL_use_certificate_ASN1 failed");
	}

	if (client_cert == NULL)
		return -1;

#ifndef OPENSSL_NO_STDIO
	if (SSL_use_certificate_file(conn->ssl, client_cert,
				     SSL_FILETYPE_ASN1) == 1) {
		wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
			   " --> OK");
		return 0;
	} else {
		tls_show_errors(MSG_DEBUG, __func__,
				"SSL_use_certificate_file (DER) failed");
	}

	if (SSL_use_certificate_file(conn->ssl, client_cert,
				     SSL_FILETYPE_PEM) == 1) {
		wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
			   " --> OK");
		return 0;
	} else {
		tls_show_errors(MSG_DEBUG, __func__,
				"SSL_use_certificate_file (PEM) failed");
	}
#else /* OPENSSL_NO_STDIO */
	wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
#endif /* OPENSSL_NO_STDIO */

	return -1;
}


static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
{
#ifndef OPENSSL_NO_STDIO
	if (client_cert == NULL)
		return 0;

	if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
					 SSL_FILETYPE_ASN1) != 1 &&
	    SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
					 SSL_FILETYPE_PEM) != 1) {
		tls_show_errors(MSG_INFO, __func__,
				"Failed to load client certificate");
		return -1;
	}
	return 0;
#else /* OPENSSL_NO_STDIO */
	if (client_cert == NULL)
		return 0;
	wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
	return -1;
#endif /* OPENSSL_NO_STDIO */
}


static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
{
	if (password == NULL) {
		return 0;
	}
	strncpy(buf, (char *) password, size);
	buf[size - 1] = '\0';
	return strlen(buf);
}


#ifdef PKCS12_FUNCS
static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
			    const char *passwd)
{
	EVP_PKEY *pkey;
	X509 *cert;
	STACK_OF(X509) *certs;
	int res = 0;
	char buf[256];

	pkey = NULL;
	cert = NULL;
	certs = NULL;
	if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
		tls_show_errors(MSG_DEBUG, __func__,
				"Failed to parse PKCS12 file");
		PKCS12_free(p12);
		return -1;
	}
	wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");

	if (cert) {
		X509_NAME_oneline(X509_get_subject_name(cert), buf,
				  sizeof(buf));
		wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
			   "subject='%s'", buf);
		if (ssl) {
			if (SSL_use_certificate(ssl, cert) != 1)
				res = -1;
		} else {
			if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
				res = -1;
		}
		X509_free(cert);
	}

	if (pkey) {
		wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
		if (ssl) {
			if (SSL_use_PrivateKey(ssl, pkey) != 1)
				res = -1;
		} else {
			if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
				res = -1;
		}
		EVP_PKEY_free(pkey);
	}

	if (certs) {
		while ((cert = sk_X509_pop(certs)) != NULL) {
			X509_NAME_oneline(X509_get_subject_name(cert), buf,
					  sizeof(buf));
			wpa_printf(MSG_DEBUG, "TLS: additional certificate"
				   " from PKCS12: subject='%s'", buf);
			/*
			 * There is no SSL equivalent for the chain cert - so
			 * always add it to the context...
			 */
			if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
				res = -1;
				break;
			}
		}
		sk_X509_free(certs);
	}

	PKCS12_free(p12);

	if (res < 0)
		tls_get_errors(ssl_ctx);

	return res;
}
#endif  /* PKCS12_FUNCS */


static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
			   const char *passwd)
{
#ifdef PKCS12_FUNCS
	FILE *f;
	PKCS12 *p12;

	f = fopen(private_key, "r");
	if (f == NULL)
		return -1;

	p12 = d2i_PKCS12_fp(f, NULL);
	fclose(f);

	if (p12 == NULL) {
		tls_show_errors(MSG_INFO, __func__,
				"Failed to use PKCS#12 file");
		return -1;
	}

	return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);

#else /* PKCS12_FUNCS */
	wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
		   "p12/pfx files");
	return -1;
#endif  /* PKCS12_FUNCS */
}


static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
				const u8 *blob, size_t len, const char *passwd)
{
#ifdef PKCS12_FUNCS
	PKCS12 *p12;

	p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
	if (p12 == NULL) {
		tls_show_errors(MSG_INFO, __func__,
				"Failed to use PKCS#12 blob");
		return -1;
	}

	return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);

#else /* PKCS12_FUNCS */
	wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
		   "p12/pfx blobs");
	return -1;
#endif  /* PKCS12_FUNCS */
}


static int tls_connection_engine_private_key(struct tls_connection *conn)
{
#ifndef OPENSSL_NO_ENGINE
	if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
		tls_show_errors(MSG_ERROR, __func__,
				"ENGINE: cannot use private key for TLS");
		return -1;
	}
	if (!SSL_check_private_key(conn->ssl)) {
		tls_show_errors(MSG_INFO, __func__,
				"Private key failed verification");
		return -1;
	}
	return 0;
#else /* OPENSSL_NO_ENGINE */
	wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
		   "engine support was not compiled in");
	return -1;
#endif /* OPENSSL_NO_ENGINE */
}


static int tls_connection_private_key(void *_ssl_ctx,
				      struct tls_connection *conn,
				      const char *private_key,
				      const char *private_key_passwd,
				      const u8 *private_key_blob,
				      size_t private_key_blob_len)
{
	SSL_CTX *ssl_ctx = _ssl_ctx;
	char *passwd;
	int ok;

	if (private_key == NULL && private_key_blob == NULL)
		return 0;

	if (private_key_passwd) {
		passwd = strdup(private_key_passwd);
		if (passwd == NULL)
			return -1;
	} else
		passwd = NULL;

	SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
	SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);

	ok = 0;
	while (private_key_blob) {
		if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
					    (u8 *) private_key_blob,
					    private_key_blob_len) == 1) {
			wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
				   "ASN1(EVP_PKEY_RSA) --> OK");
			ok = 1;
			break;
		} else {
			tls_show_errors(MSG_DEBUG, __func__,
					"SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA)"
					" failed");
		}

		if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
					    (u8 *) private_key_blob,
					    private_key_blob_len) == 1) {
			wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
				   "ASN1(EVP_PKEY_DSA) --> OK");
			ok = 1;
			break;
		} else {
			tls_show_errors(MSG_DEBUG, __func__,
					"SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA)"
					" failed");
		}

		if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
					       (u8 *) private_key_blob,
					       private_key_blob_len) == 1) {
			wpa_printf(MSG_DEBUG, "OpenSSL: "
				   "SSL_use_RSAPrivateKey_ASN1 --> OK");
			ok = 1;
			break;
		} else {
			tls_show_errors(MSG_DEBUG, __func__,
					"SSL_use_RSAPrivateKey_ASN1 failed");
		}

		if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
					 private_key_blob_len, passwd) == 0) {
			wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
				   "OK");
			ok = 1;
			break;
		}

		break;
	}

	while (!ok && private_key) {
#ifndef OPENSSL_NO_STDIO
		if (SSL_use_PrivateKey_file(conn->ssl, private_key,
					    SSL_FILETYPE_ASN1) == 1) {
			wpa_printf(MSG_DEBUG, "OpenSSL: "
				   "SSL_use_PrivateKey_File (DER) --> OK");
			ok = 1;
			break;
		} else {
			tls_show_errors(MSG_DEBUG, __func__,
					"SSL_use_PrivateKey_File (DER) "
					"failed");
		}

		if (SSL_use_PrivateKey_file(conn->ssl, private_key,
					    SSL_FILETYPE_PEM) == 1) {
			wpa_printf(MSG_DEBUG, "OpenSSL: "
				   "SSL_use_PrivateKey_File (PEM) --> OK");
			ok = 1;
			break;
		} else {
			tls_show_errors(MSG_DEBUG, __func__,
					"SSL_use_PrivateKey_File (PEM) "
					"failed");
		}
#else /* OPENSSL_NO_STDIO */
		wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
			   __func__);
#endif /* OPENSSL_NO_STDIO */

		if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
		    == 0) {
			wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
				   "--> OK");
			ok = 1;
			break;
		}

		if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
			wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
				   "access certificate store --> OK");
			ok = 1;
			break;
		}

		break;
	}

	if (!ok) {
		wpa_printf(MSG_INFO, "OpenSSL: Failed to load private key");
		free(passwd);
		ERR_clear_error();
		return -1;
	}
	ERR_clear_error();
	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
	free(passwd);
	
	if (!SSL_check_private_key(conn->ssl)) {
		tls_show_errors(MSG_INFO, __func__, "Private key failed "
				"verification");
		return -1;
	}

	wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
	return 0;
}


static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
				  const char *private_key_passwd)
{
	char *passwd;

	if (private_key == NULL)
		return 0;

	if (private_key_passwd) {
		passwd = strdup(private_key_passwd);
		if (passwd == NULL)
			return -1;
	} else
		passwd = NULL;

	SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
	SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
	if (
#ifndef OPENSSL_NO_STDIO
	    SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
					SSL_FILETYPE_ASN1) != 1 &&
	    SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
					SSL_FILETYPE_PEM) != 1 &&
#endif /* OPENSSL_NO_STDIO */
	    tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
		tls_show_errors(MSG_INFO, __func__,
				"Failed to load private key");
		free(passwd);
		ERR_clear_error();
		return -1;
	}
	free(passwd);
	ERR_clear_error();
	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
	
	if (!SSL_CTX_check_private_key(ssl_ctx)) {
		tls_show_errors(MSG_INFO, __func__,
				"Private key failed verification");
		return -1;
	}

	return 0;
}


static int tls_connection_dh(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 */