tls_openssl.c

IEEE802.11 a/b/g 客户端应用程序源代码

			   "preverify_ok=%d err=%d (%s) depth=%d buf='%s'",
			   preverify_ok, err,
			   X509_verify_cert_error_string(err), depth, buf);
		if (depth == 0 && match && os_strstr(buf, match) == NULL) {
			wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
				   "match with '%s'", buf, match);
			preverify_ok = 0;
		} else if (depth == 0 && altmatch &&
			   !tls_match_altsubject(err_cert, altmatch)) {
			wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
				   "'%s' not found", altmatch);
			preverify_ok = 0;
		}
	}

	return preverify_ok;
}


#ifndef OPENSSL_NO_STDIO
static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
{
	SSL_CTX *ssl_ctx = _ssl_ctx;
	X509_LOOKUP *lookup;
	int ret = 0;

	lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
				       X509_LOOKUP_file());
	if (lookup == NULL) {
		tls_show_errors(MSG_WARNING, __func__,
				"Failed add lookup for X509 store");
		return -1;
	}

	if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
		unsigned long err = ERR_peek_error();
		tls_show_errors(MSG_WARNING, __func__,
				"Failed load CA in DER format");
		if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
		    ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
			wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
				   "cert already in hash table error",
				   __func__);
		} else
			ret = -1;
	}

	return ret;
}
#endif /* OPENSSL_NO_STDIO */


static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
				  const char *ca_cert, const u8 *ca_cert_blob,
				  size_t ca_cert_blob_len, const char *ca_path)
{
	SSL_CTX *ssl_ctx = _ssl_ctx;

	/*
	 * Remove previously configured trusted CA certificates before adding
	 * new ones.
	 */
	X509_STORE_free(ssl_ctx->cert_store);
	ssl_ctx->cert_store = X509_STORE_new();
	if (ssl_ctx->cert_store == NULL) {
		wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
			   "certificate store", __func__);
		return -1;
	}

	if (ca_cert_blob) {
		X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
				      ca_cert_blob_len);
		if (cert == NULL) {
			tls_show_errors(MSG_WARNING, __func__,
					"Failed to parse ca_cert_blob");
			return -1;
		}

		if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
			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__);
		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
		return 0;
	}

#ifdef CONFIG_NATIVE_WINDOWS
	if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
	    0) {
		wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
			   "system certificate store");
		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
		return 0;
	}
#endif /* CONFIG_NATIVE_WINDOWS */

	if (ca_cert || ca_path) {
#ifndef OPENSSL_NO_STDIO
		if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
		    1) {
			tls_show_errors(MSG_WARNING, __func__,
					"Failed to load root certificates");
			if (ca_cert &&
			    tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
				wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
					   "DER format CA certificate",
					   __func__);
			} else
				return -1;
		} else {
			wpa_printf(MSG_DEBUG, "TLS: Trusted root "
				   "certificate(s) loaded");
			tls_get_errors(ssl_ctx);
		}
		SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
#else /* OPENSSL_NO_STDIO */
		wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
			   __func__);
		return -1;
#endif /* OPENSSL_NO_STDIO */
	} else {
		/* No ca_cert configured - do not try to verify server
		 * certificate */
		SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
	}

	return 0;
}


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)
{
	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;
	}

	return 0;
}


int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
			      int verify_peer)
{
	static int counter = 0;

	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);

	/*
	 * Set session id context in order to avoid fatal errors when client
	 * tries to resume a session. However, set the context to a unique
	 * value in order to effectively disable session resumption for now
	 * since not all areas of the server code are ready for it (e.g.,
	 * EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
	 * handshake).
	 */
	counter++;
	SSL_set_session_id_context(conn->ssl,
				   (const unsigned char *) &counter,
				   sizeof(counter));

	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;
	}
	os_strlcpy(buf, (char *) password, size);
	return os_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, "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(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 */
}


#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)) {
		wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
			   " '%s' [%s]", cert_id,
			   ERR_error_string(ERR_get_error(), NULL));
		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(void *_ssl_ctx,
					 struct tls_connection *conn,
					 const char *ca_cert_id)
{
#ifndef OPENSSL_NO_ENGINE
	X509 *cert;
	SSL_CTX *ssl_ctx = _ssl_ctx;

	if (tls_engine_get_cert(conn, ca_cert_id, &cert))
		return -1;

	/* start off the same as tls_connection_ca_cert */
	X509_STORE_free(ssl_ctx->cert_store);