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options.c
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options.c
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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2013 OpenVPN Technologies, Inc. <sales@openvpn.net>
* Copyright (C) 2008-2013 David Sommerseth <dazo@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* 2004-01-28: Added Socks5 proxy support
* (Christof Meerwald, http://cmeerw.org)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#ifdef HAVE_CONFIG_VERSION_H
#include "config-version.h"
#endif
#include "syshead.h"
#include "buffer.h"
#include "error.h"
#include "common.h"
#include "shaper.h"
#include "crypto.h"
#include "ssl.h"
#include "options.h"
#include "misc.h"
#include "socket.h"
#include "packet_id.h"
#include "pkcs11.h"
#include "win32.h"
#include "push.h"
#include "pool.h"
#include "helper.h"
#include "manage.h"
#include "forward.h"
#include "ssl_verify.h"
#include <ctype.h>
#include "memdbg.h"
const char title_string[] =
PACKAGE_STRING
#ifdef CONFIGURE_GIT_REVISION
" [git:" CONFIGURE_GIT_REVISION CONFIGURE_GIT_FLAGS "]"
#endif
" " TARGET_ALIAS
#ifdef ENABLE_CRYPTO
#if defined(ENABLE_CRYPTO_POLARSSL)
" [SSL (PolarSSL)]"
#elif defined(ENABLE_CRYPTO_OPENSSL)
" [SSL (OpenSSL)]"
#else
" [SSL]"
#endif /* defined(ENABLE_CRYPTO_POLARSSL) */
#endif /* ENABLE_CRYPTO */
#ifdef USE_COMP
#ifdef ENABLE_LZO
" [LZO]"
#endif
#ifdef ENABLE_LZ4
" [LZ4]"
#endif
#ifdef ENABLE_COMP_STUB
" [COMP_STUB]"
#endif
#endif /* USE_COMP */
#if EPOLL
" [EPOLL]"
#endif
#ifdef PRODUCT_TAP_DEBUG
" [TAPDBG]"
#endif
#ifdef ENABLE_PKCS11
" [PKCS11]"
#endif
#if ENABLE_IP_PKTINFO
" [MH]"
#endif
" [IPv6]"
" built on " __DATE__
;
#ifndef ENABLE_SMALL
static const char usage_message[] =
"%s\n"
"\n"
"General Options:\n"
"--config file : Read configuration options from file.\n"
"--help : Show options.\n"
"--version : Show copyright and version information.\n"
"\n"
"Tunnel Options:\n"
"--local host : Local host name or ip address. Implies --bind.\n"
"--remote host [port] : Remote host name or ip address.\n"
"--remote-random : If multiple --remote options specified, choose one randomly.\n"
"--remote-random-hostname : Add a random string to remote DNS name.\n"
"--mode m : Major mode, m = 'p2p' (default, point-to-point) or 'server'.\n"
"--proto p : Use protocol p for communicating with peer.\n"
" p = udp (default), tcp-server, or tcp-client\n"
"--proto-force p : only consider protocol p in list of connection profiles.\n"
" p = udp6, tcp6-server, or tcp6-client (ipv6)\n"
"--connect-retry n : For --proto tcp-client, number of seconds to wait\n"
" between connection retries (default=%d).\n"
"--connect-timeout n : For --proto tcp-client, connection timeout (in seconds).\n"
"--connect-retry-max n : Maximum connection attempt retries, default infinite.\n"
"--http-proxy s p [up] [auth] : Connect to remote host\n"
" through an HTTP proxy at address s and port p.\n"
" If proxy authentication is required,\n"
" up is a file containing username/password on 2 lines, or\n"
" 'stdin' to prompt from console. Add auth='ntlm' if\n"
" the proxy requires NTLM authentication.\n"
"--http-proxy s p 'auto[-nct]' : Like the above directive, but automatically\n"
" determine auth method and query for username/password\n"
" if needed. auto-nct disables weak proxy auth methods.\n"
"--http-proxy-retry : Retry indefinitely on HTTP proxy errors.\n"
"--http-proxy-timeout n : Proxy timeout in seconds, default=5.\n"
"--http-proxy-option type [parm] : Set extended HTTP proxy options.\n"
" Repeat to set multiple options.\n"
" VERSION version (default=1.0)\n"
" AGENT user-agent\n"
"--socks-proxy s [p] [up] : Connect to remote host through a Socks5 proxy at\n"
" address s and port p (default port = 1080).\n"
" If proxy authentication is required,\n"
" up is a file containing username/password on 2 lines, or\n"
" 'stdin' to prompt for console.\n"
"--socks-proxy-retry : Retry indefinitely on Socks proxy errors.\n"
"--resolv-retry n: If hostname resolve fails for --remote, retry\n"
" resolve for n seconds before failing (disabled by default).\n"
" Set n=\"infinite\" to retry indefinitely.\n"
"--float : Allow remote to change its IP address/port, such as through\n"
" DHCP (this is the default if --remote is not used).\n"
"--ipchange cmd : Run command cmd on remote ip address initial\n"
" setting or change -- execute as: cmd ip-address port#\n"
"--port port : TCP/UDP port # for both local and remote.\n"
"--lport port : TCP/UDP port # for local (default=%s). Implies --bind.\n"
"--rport port : TCP/UDP port # for remote (default=%s).\n"
"--bind : Bind to local address and port. (This is the default unless\n"
" --proto tcp-client"
" or --http-proxy"
" or --socks-proxy"
" is used).\n"
"--nobind : Do not bind to local address and port.\n"
"--dev tunX|tapX : tun/tap device (X can be omitted for dynamic device.\n"
"--dev-type dt : Which device type are we using? (dt = tun or tap) Use\n"
" this option only if the tun/tap device used with --dev\n"
" does not begin with \"tun\" or \"tap\".\n"
"--dev-node node : Explicitly set the device node rather than using\n"
" /dev/net/tun, /dev/tun, /dev/tap, etc.\n"
"--lladdr hw : Set the link layer address of the tap device.\n"
"--topology t : Set --dev tun topology: 'net30', 'p2p', or 'subnet'.\n"
"--tun-ipv6 : Build tun link capable of forwarding IPv6 traffic.\n"
#ifdef ENABLE_IPROUTE
"--iproute cmd : Use this command instead of default " IPROUTE_PATH ".\n"
#endif
"--ifconfig l rn : TUN: configure device to use IP address l as a local\n"
" endpoint and rn as a remote endpoint. l & rn should be\n"
" swapped on the other peer. l & rn must be private\n"
" addresses outside of the subnets used by either peer.\n"
" TAP: configure device to use IP address l as a local\n"
" endpoint and rn as a subnet mask.\n"
"--ifconfig-ipv6 l r : configure device to use IPv6 address l as local\n"
" endpoint (as a /64) and r as remote endpoint\n"
"--ifconfig-noexec : Don't actually execute ifconfig/netsh command, instead\n"
" pass --ifconfig parms by environment to scripts.\n"
"--ifconfig-nowarn : Don't warn if the --ifconfig option on this side of the\n"
" connection doesn't match the remote side.\n"
"--route network [netmask] [gateway] [metric] :\n"
" Add route to routing table after connection\n"
" is established. Multiple routes can be specified.\n"
" netmask default: 255.255.255.255\n"
" gateway default: taken from --route-gateway or --ifconfig\n"
" Specify default by leaving blank or setting to \"nil\".\n"
"--route-ipv6 network/bits [gateway] [metric] :\n"
" Add IPv6 route to routing table after connection\n"
" is established. Multiple routes can be specified.\n"
" gateway default: taken from 'remote' in --ifconfig-ipv6\n"
"--route-gateway gw|'dhcp' : Specify a default gateway for use with --route.\n"
"--route-metric m : Specify a default metric for use with --route.\n"
"--route-delay n [w] : Delay n seconds after connection initiation before\n"
" adding routes (may be 0). If not specified, routes will\n"
" be added immediately after tun/tap open. On Windows, wait\n"
" up to w seconds for TUN/TAP adapter to come up.\n"
"--route-up cmd : Run command cmd after routes are added.\n"
"--route-pre-down cmd : Run command cmd before routes are removed.\n"
"--route-noexec : Don't add routes automatically. Instead pass routes to\n"
" --route-up script using environmental variables.\n"
"--route-nopull : When used with --client or --pull, accept options pushed\n"
" by server EXCEPT for routes and dhcp options.\n"
"--allow-pull-fqdn : Allow client to pull DNS names from server for\n"
" --ifconfig, --route, and --route-gateway.\n"
"--redirect-gateway [flags]: Automatically execute routing\n"
" commands to redirect all outgoing IP traffic through the\n"
" VPN. Add 'local' flag if both " PACKAGE_NAME " servers are directly\n"
" connected via a common subnet, such as with WiFi.\n"
" Add 'def1' flag to set default route using using 0.0.0.0/1\n"
" and 128.0.0.0/1 rather than 0.0.0.0/0. Add 'bypass-dhcp'\n"
" flag to add a direct route to DHCP server, bypassing tunnel.\n"
" Add 'bypass-dns' flag to similarly bypass tunnel for DNS.\n"
"--redirect-private [flags]: Like --redirect-gateway, but omit actually changing\n"
" the default gateway. Useful when pushing private subnets.\n"
"--client-nat snat|dnat network netmask alias : on client add 1-to-1 NAT rule.\n"
#ifdef ENABLE_PUSH_PEER_INFO
"--push-peer-info : (client only) push client info to server.\n"
#endif
"--setenv name value : Set a custom environmental variable to pass to script.\n"
"--setenv FORWARD_COMPATIBLE 1 : Relax config file syntax checking to allow\n"
" directives for future OpenVPN versions to be ignored.\n"
"--ignore-unkown-option opt1 opt2 ...: Relax config file syntax. Allow\n"
" these options to be ignored when unknown\n"
"--script-security level: Where level can be:\n"
" 0 -- strictly no calling of external programs\n"
" 1 -- (default) only call built-ins such as ifconfig\n"
" 2 -- allow calling of built-ins and scripts\n"
" 3 -- allow password to be passed to scripts via env\n"
"--shaper n : Restrict output to peer to n bytes per second.\n"
"--keepalive n m : Helper option for setting timeouts in server mode. Send\n"
" ping once every n seconds, restart if ping not received\n"
" for m seconds.\n"
"--inactive n [bytes] : Exit after n seconds of activity on tun/tap device\n"
" produces a combined in/out byte count < bytes.\n"
"--ping-exit n : Exit if n seconds pass without reception of remote ping.\n"
"--ping-restart n: Restart if n seconds pass without reception of remote ping.\n"
"--ping-timer-rem: Run the --ping-exit/--ping-restart timer only if we have a\n"
" remote address.\n"
"--ping n : Ping remote once every n seconds over TCP/UDP port.\n"
#if ENABLE_IP_PKTINFO
"--multihome : Configure a multi-homed UDP server.\n"
#endif
"--fast-io : (experimental) Optimize TUN/TAP/UDP writes.\n"
"--remap-usr1 s : On SIGUSR1 signals, remap signal (s='SIGHUP' or 'SIGTERM').\n"
"--persist-tun : Keep tun/tap device open across SIGUSR1 or --ping-restart.\n"
"--persist-remote-ip : Keep remote IP address across SIGUSR1 or --ping-restart.\n"
"--persist-local-ip : Keep local IP address across SIGUSR1 or --ping-restart.\n"
"--persist-key : Don't re-read key files across SIGUSR1 or --ping-restart.\n"
#if PASSTOS_CAPABILITY
"--passtos : TOS passthrough (applies to IPv4 only).\n"
#endif
"--tun-mtu n : Take the tun/tap device MTU to be n and derive the\n"
" TCP/UDP MTU from it (default=%d).\n"
"--tun-mtu-extra n : Assume that tun/tap device might return as many\n"
" as n bytes more than the tun-mtu size on read\n"
" (default TUN=0 TAP=%d).\n"
"--link-mtu n : Take the TCP/UDP device MTU to be n and derive the tun MTU\n"
" from it.\n"
"--mtu-disc type : Should we do Path MTU discovery on TCP/UDP channel?\n"
" 'no' -- Never send DF (Don't Fragment) frames\n"
" 'maybe' -- Use per-route hints\n"
" 'yes' -- Always DF (Don't Fragment)\n"
#ifdef ENABLE_OCC
"--mtu-test : Empirically measure and report MTU.\n"
#endif
#ifdef ENABLE_FRAGMENT
"--fragment max : Enable internal datagram fragmentation so that no UDP\n"
" datagrams are sent which are larger than max bytes.\n"
" Adds 4 bytes of overhead per datagram.\n"
#endif
"--mssfix [n] : Set upper bound on TCP MSS, default = tun-mtu size\n"
" or --fragment max value, whichever is lower.\n"
"--sndbuf size : Set the TCP/UDP send buffer size.\n"
"--rcvbuf size : Set the TCP/UDP receive buffer size.\n"
#if defined(TARGET_LINUX) && HAVE_DECL_SO_MARK
"--mark value : Mark encrypted packets being sent with value. The mark value\n"
" can be matched in policy routing and packetfilter rules.\n"
#endif
"--txqueuelen n : Set the tun/tap TX queue length to n (Linux only).\n"
#ifdef ENABLE_MEMSTATS
"--memstats file : Write live usage stats to memory mapped binary file.\n"
#endif
"--mlock : Disable Paging -- ensures key material and tunnel\n"
" data will never be written to disk.\n"
"--up cmd : Run command cmd after successful tun device open.\n"
" Execute as: cmd tun/tap-dev tun-mtu link-mtu \\\n"
" ifconfig-local-ip ifconfig-remote-ip\n"
" (pre --user or --group UID/GID change)\n"
"--up-delay : Delay tun/tap open and possible --up script execution\n"
" until after TCP/UDP connection establishment with peer.\n"
"--down cmd : Run command cmd after tun device close.\n"
" (post --user/--group UID/GID change and/or --chroot)\n"
" (command parameters are same as --up option)\n"
"--down-pre : Run --down command before TUN/TAP close.\n"
"--up-restart : Run up/down commands for all restarts including those\n"
" caused by --ping-restart or SIGUSR1\n"
"--user user : Set UID to user after initialization.\n"
"--group group : Set GID to group after initialization.\n"
"--chroot dir : Chroot to this directory after initialization.\n"
#ifdef ENABLE_SELINUX
"--setcon context: Apply this SELinux context after initialization.\n"
#endif
"--cd dir : Change to this directory before initialization.\n"
"--daemon [name] : Become a daemon after initialization.\n"
" The optional 'name' parameter will be passed\n"
" as the program name to the system logger.\n"
"--syslog [name] : Output to syslog, but do not become a daemon.\n"
" See --daemon above for a description of the 'name' parm.\n"
"--inetd [name] ['wait'|'nowait'] : Run as an inetd or xinetd server.\n"
" See --daemon above for a description of the 'name' parm.\n"
"--log file : Output log to file which is created/truncated on open.\n"
"--log-append file : Append log to file, or create file if nonexistent.\n"
"--suppress-timestamps : Don't log timestamps to stdout/stderr.\n"
"--machine-readable-output : Always log timestamp, message flags to stdout/stderr.\n"
"--writepid file : Write main process ID to file.\n"
"--nice n : Change process priority (>0 = lower, <0 = higher).\n"
"--echo [parms ...] : Echo parameters to log output.\n"
"--verb n : Set output verbosity to n (default=%d):\n"
" (Level 3 is recommended if you want a good summary\n"
" of what's happening without being swamped by output).\n"
" : 0 -- no output except fatal errors\n"
" : 1 -- startup info + connection initiated messages +\n"
" non-fatal encryption & net errors\n"
" : 2,3 -- show TLS negotiations & route info\n"
" : 4 -- show parameters\n"
" : 5 -- show 'RrWw' chars on console for each packet sent\n"
" and received from TCP/UDP (caps) or tun/tap (lc)\n"
" : 6 to 11 -- debug messages of increasing verbosity\n"
"--mute n : Log at most n consecutive messages in the same category.\n"
"--status file n : Write operational status to file every n seconds.\n"
"--status-version [n] : Choose the status file format version number.\n"
" Currently, n can be 1, 2, or 3 (default=1).\n"
#ifdef ENABLE_OCC
"--disable-occ : Disable options consistency check between peers.\n"
#endif
#ifdef ENABLE_DEBUG
"--gremlin mask : Special stress testing mode (for debugging only).\n"
#endif
#if defined(USE_COMP)
"--compress alg : Use compression algorithm alg\n"
#if defined(ENABLE_LZO)
"--comp-lzo : Use LZO compression -- may add up to 1 byte per\n"
" packet for uncompressible data.\n"
"--comp-noadapt : Don't use adaptive compression when --comp-lzo\n"
" is specified.\n"
#endif
#endif
#ifdef ENABLE_MANAGEMENT
"--management ip port [pass] : Enable a TCP server on ip:port to handle\n"
" management functions. pass is a password file\n"
" or 'stdin' to prompt from console.\n"
#if UNIX_SOCK_SUPPORT
" To listen on a unix domain socket, specific the pathname\n"
" in place of ip and use 'unix' as the port number.\n"
#endif
"--management-client : Management interface will connect as a TCP client to\n"
" ip/port rather than listen as a TCP server.\n"
"--management-query-passwords : Query management channel for private key\n"
" and auth-user-pass passwords.\n"
"--management-query-proxy : Query management channel for proxy information.\n"
"--management-query-remote : Query management channel for --remote directive.\n"
"--management-hold : Start " PACKAGE_NAME " in a hibernating state, until a client\n"
" of the management interface explicitly starts it.\n"
"--management-signal : Issue SIGUSR1 when management disconnect event occurs.\n"
"--management-forget-disconnect : Forget passwords when management disconnect\n"
" event occurs.\n"
"--management-up-down : Report tunnel up/down events to management interface.\n"
"--management-log-cache n : Cache n lines of log file history for usage\n"
" by the management channel.\n"
#if UNIX_SOCK_SUPPORT
"--management-client-user u : When management interface is a unix socket, only\n"
" allow connections from user u.\n"
"--management-client-group g : When management interface is a unix socket, only\n"
" allow connections from group g.\n"
#endif
#ifdef MANAGEMENT_DEF_AUTH
"--management-client-auth : gives management interface client the responsibility\n"
" to authenticate clients after their client certificate\n"
" has been verified.\n"
#endif
#ifdef MANAGEMENT_PF
"--management-client-pf : management interface clients must specify a packet\n"
" filter file for each connecting client.\n"
#endif
#endif
#ifdef ENABLE_PLUGIN
"--plugin m [str]: Load plug-in module m passing str as an argument\n"
" to its initialization function.\n"
#endif
#if P2MP
#if P2MP_SERVER
"\n"
"Multi-Client Server options (when --mode server is used):\n"
"--server network netmask : Helper option to easily configure server mode.\n"
"--server-ipv6 network/bits : Configure IPv6 server mode.\n"
"--server-bridge [IP netmask pool-start-IP pool-end-IP] : Helper option to\n"
" easily configure ethernet bridging server mode.\n"
"--push \"option\" : Push a config file option back to the peer for remote\n"
" execution. Peer must specify --pull in its config file.\n"
"--push-reset : Don't inherit global push list for specific\n"
" client instance.\n"
"--ifconfig-pool start-IP end-IP [netmask] : Set aside a pool of subnets\n"
" to be dynamically allocated to connecting clients.\n"
"--ifconfig-pool-linear : Use individual addresses rather than /30 subnets\n"
" in tun mode. Not compatible with Windows clients.\n"
"--ifconfig-pool-persist file [seconds] : Persist/unpersist ifconfig-pool\n"
" data to file, at seconds intervals (default=600).\n"
" If seconds=0, file will be treated as read-only.\n"
"--ifconfig-ipv6-pool base-IP/bits : set aside an IPv6 network block\n"
" to be dynamically allocated to connecting clients.\n"
"--ifconfig-push local remote-netmask : Push an ifconfig option to remote,\n"
" overrides --ifconfig-pool dynamic allocation.\n"
" Only valid in a client-specific config file.\n"
"--ifconfig-ipv6-push local/bits remote : Push an ifconfig-ipv6 option to\n"
" remote, overrides --ifconfig-ipv6-pool allocation.\n"
" Only valid in a client-specific config file.\n"
"--iroute network [netmask] : Route subnet to client.\n"
"--iroute-ipv6 network/bits : Route IPv6 subnet to client.\n"
" Sets up internal routes only.\n"
" Only valid in a client-specific config file.\n"
"--disable : Client is disabled.\n"
" Only valid in a client-specific config file.\n"
"--client-cert-not-required : Don't require client certificate, client\n"
" will authenticate using username/password.\n"
"--verify-client-cert [none|optional|require] : perform no, optional or\n"
" mandatory client certificate verification.\n"
" Default is to require the client to supply a certificate.\n"
"--username-as-common-name : For auth-user-pass authentication, use\n"
" the authenticated username as the common name,\n"
" rather than the common name from the client cert.\n"
"--auth-user-pass-verify cmd method: Query client for username/password and\n"
" run command cmd to verify. If method='via-env', pass\n"
" user/pass via environment, if method='via-file', pass\n"
" user/pass via temporary file.\n"
"--opt-verify : Clients that connect with options that are incompatible\n"
" with those of the server will be disconnected.\n"
"--auth-user-pass-optional : Allow connections by clients that don't\n"
" specify a username/password.\n"
"--no-name-remapping : Allow Common Name and X509 Subject to include\n"
" any printable character.\n"
"--client-to-client : Internally route client-to-client traffic.\n"
"--duplicate-cn : Allow multiple clients with the same common name to\n"
" concurrently connect.\n"
"--client-connect cmd : Run command cmd on client connection.\n"
"--client-disconnect cmd : Run command cmd on client disconnection.\n"
"--client-config-dir dir : Directory for custom client config files.\n"
"--ccd-exclusive : Refuse connection unless custom client config is found.\n"
"--tmp-dir dir : Temporary directory, used for --client-connect return file and plugin communication.\n"
"--hash-size r v : Set the size of the real address hash table to r and the\n"
" virtual address table to v.\n"
"--bcast-buffers n : Allocate n broadcast buffers.\n"
"--tcp-queue-limit n : Maximum number of queued TCP output packets.\n"
"--tcp-nodelay : Macro that sets TCP_NODELAY socket flag on the server\n"
" as well as pushes it to connecting clients.\n"
"--learn-address cmd : Run command cmd to validate client virtual addresses.\n"
"--connect-freq n s : Allow a maximum of n new connections per s seconds.\n"
"--max-clients n : Allow a maximum of n simultaneously connected clients.\n"
"--max-routes-per-client n : Allow a maximum of n internal routes per client.\n"
"--stale-routes-check n [t] : Remove routes with a last activity timestamp\n"
" older than n seconds. Run this check every t\n"
" seconds (defaults to n).\n"
"--explicit-exit-notify [n] : In UDP server mode send [RESTART] command on exit/restart to connected\n"
" clients. n = 1 - reconnect to same server,\n"
" 2 - advance to next server, default=1.\n"
#if PORT_SHARE
"--port-share host port [dir] : When run in TCP mode, proxy incoming HTTPS\n"
" sessions to a web server at host:port. dir specifies an\n"
" optional directory to write origin IP:port data.\n"
#endif
#endif
"\n"
"Client options (when connecting to a multi-client server):\n"
"--client : Helper option to easily configure client mode.\n"
"--auth-user-pass [up] : Authenticate with server using username/password.\n"
" up is a file containing the username on the first line,\n"
" and a password on the second. If either the password or both\n"
" the username and the password are omitted OpenVPN will prompt\n"
" for them from console.\n"
"--pull : Accept certain config file options from the peer as if they\n"
" were part of the local config file. Must be specified\n"
" when connecting to a '--mode server' remote host.\n"
"--auth-retry t : How to handle auth failures. Set t to\n"
" none (default), interact, or nointeract.\n"
"--static-challenge t e : Enable static challenge/response protocol using\n"
" challenge text t, with e indicating echo flag (0|1)\n"
"--server-poll-timeout n : when polling possible remote servers to connect to\n"
" in a round-robin fashion, spend no more than n seconds\n"
" waiting for a response before trying the next server.\n"
#endif
#ifdef ENABLE_OCC
"--explicit-exit-notify [n] : On exit/restart, send exit signal to\n"
" server/remote. n = # of retries, default=1.\n"
#endif
#ifdef ENABLE_CRYPTO
"\n"
"Data Channel Encryption Options (must be compatible between peers):\n"
"(These options are meaningful for both Static Key & TLS-mode)\n"
"--secret f [d] : Enable Static Key encryption mode (non-TLS).\n"
" Use shared secret file f, generate with --genkey.\n"
" The optional d parameter controls key directionality.\n"
" If d is specified, use separate keys for each\n"
" direction, set d=0 on one side of the connection,\n"
" and d=1 on the other side.\n"
"--auth alg : Authenticate packets with HMAC using message\n"
" digest algorithm alg (default=%s).\n"
" (usually adds 16 or 20 bytes per packet)\n"
" Set alg=none to disable authentication.\n"
"--cipher alg : Encrypt packets with cipher algorithm alg\n"
" (default=%s).\n"
" Set alg=none to disable encryption.\n"
"--prng alg [nsl] : For PRNG, use digest algorithm alg, and\n"
" nonce_secret_len=nsl. Set alg=none to disable PRNG.\n"
#ifdef HAVE_EVP_CIPHER_CTX_SET_KEY_LENGTH
"--keysize n : Size of cipher key in bits (optional).\n"
" If unspecified, defaults to cipher-specific default.\n"
#endif
#ifndef ENABLE_CRYPTO_POLARSSL
"--engine [name] : Enable OpenSSL hardware crypto engine functionality.\n"
#endif
"--no-replay : Disable replay protection.\n"
"--mute-replay-warnings : Silence the output of replay warnings to log file.\n"
"--replay-window n [t] : Use a replay protection sliding window of size n\n"
" and a time window of t seconds.\n"
" Default n=%d t=%d\n"
"--no-iv : Disable cipher IV -- only allowed with CBC mode ciphers.\n"
"--replay-persist file : Persist replay-protection state across sessions\n"
" using file.\n"
"--test-crypto : Run a self-test of crypto features enabled.\n"
" For debugging only.\n"
#ifdef ENABLE_PREDICTION_RESISTANCE
"--use-prediction-resistance: Enable prediction resistance on the random\n"
" number generator.\n"
#endif
"\n"
"TLS Key Negotiation Options:\n"
"(These options are meaningful only for TLS-mode)\n"
"--tls-server : Enable TLS and assume server role during TLS handshake.\n"
"--tls-client : Enable TLS and assume client role during TLS handshake.\n"
"--key-method m : Data channel key exchange method. m should be a method\n"
" number, such as 1 (default), 2, etc.\n"
"--ca file : Certificate authority file in .pem format containing\n"
" root certificate.\n"
#ifndef ENABLE_CRYPTO_POLARSSL
"--capath dir : A directory of trusted certificates (CAs"
" and CRLs).\n"
#endif /* ENABLE_CRYPTO_POLARSSL */
"--dh file : File containing Diffie Hellman parameters\n"
" in .pem format (for --tls-server only).\n"
" Use \"openssl dhparam -out dh1024.pem 1024\" to generate.\n"
"--cert file : Local certificate in .pem format -- must be signed\n"
" by a Certificate Authority in --ca file.\n"
"--extra-certs file : one or more PEM certs that complete the cert chain.\n"
"--key file : Local private key in .pem format.\n"
"--tls-version-min <version> ['or-highest'] : sets the minimum TLS version we\n"
" will accept from the peer. If version is unrecognized and 'or-highest'\n"
" is specified, require max TLS version supported by SSL implementation.\n"
"--tls-version-max <version> : sets the maximum TLS version we will use.\n"
#ifndef ENABLE_CRYPTO_POLARSSL
"--pkcs12 file : PKCS#12 file containing local private key, local certificate\n"
" and optionally the root CA certificate.\n"
#endif
#ifdef ENABLE_X509ALTUSERNAME
"--x509-username-field : Field in x509 certificate containing the username.\n"
" Default is CN in the Subject field.\n"
#endif
"--verify-hash : Specify SHA1 fingerprint for level-1 cert.\n"
#ifdef WIN32
"--cryptoapicert select-string : Load the certificate and private key from the\n"
" Windows Certificate System Store.\n"
#endif
"--tls-cipher l : A list l of allowable TLS ciphers separated by : (optional).\n"
" : Use --show-tls to see a list of supported TLS ciphers.\n"
"--tls-timeout n : Packet retransmit timeout on TLS control channel\n"
" if no ACK from remote within n seconds (default=%d).\n"
"--reneg-bytes n : Renegotiate data chan. key after n bytes sent and recvd.\n"
"--reneg-pkts n : Renegotiate data chan. key after n packets sent and recvd.\n"
"--reneg-sec n : Renegotiate data chan. key after n seconds (default=%d).\n"
"--hand-window n : Data channel key exchange must finalize within n seconds\n"
" of handshake initiation by any peer (default=%d).\n"
"--tran-window n : Transition window -- old key can live this many seconds\n"
" after new key renegotiation begins (default=%d).\n"
"--single-session: Allow only one session (reset state on restart).\n"
"--tls-exit : Exit on TLS negotiation failure.\n"
"--tls-auth f [d]: Add an additional layer of authentication on top of the TLS\n"
" control channel to protect against DoS attacks.\n"
" f (required) is a shared-secret passphrase file.\n"
" The optional d parameter controls key directionality,\n"
" see --secret option for more info.\n"
"--askpass [file]: Get PEM password from controlling tty before we daemonize.\n"
"--auth-nocache : Don't cache --askpass or --auth-user-pass passwords.\n"
"--crl-verify crl ['dir']: Check peer certificate against a CRL.\n"
"--tls-verify cmd: Run command cmd to verify the X509 name of a\n"
" pending TLS connection that has otherwise passed all other\n"
" tests of certification. cmd should return 0 to allow\n"
" TLS handshake to proceed, or 1 to fail. (cmd is\n"
" executed as 'cmd certificate_depth subject')\n"
"--tls-export-cert [directory] : Get peer cert in PEM format and store it \n"
" in an openvpn temporary file in [directory]. Peer cert is \n"
" stored before tls-verify script execution and deleted after.\n"
"--verify-x509-name name: Accept connections only from a host with X509 subject\n"
" DN name. The remote host must also pass all other tests\n"
" of verification.\n"
"--ns-cert-type t: Require that peer certificate was signed with an explicit\n"
" nsCertType designation t = 'client' | 'server'.\n"
#ifdef ENABLE_X509_TRACK
"--x509-track x : Save peer X509 attribute x in environment for use by\n"
" plugins and management interface.\n"
#endif
#if defined(ENABLE_CRYPTO_OPENSSL) && OPENSSL_VERSION_NUMBER >= 0x10001000
"--keying-material-exporter label len : Save Exported Keying Material (RFC5705)\n"
" of len bytes (min. 16 bytes) using label in environment for use by plugins.\n"
#endif
"--remote-cert-ku v ... : Require that the peer certificate was signed with\n"
" explicit key usage, you can specify more than one value.\n"
" value should be given in hex format.\n"
"--remote-cert-eku oid : Require that the peer certificate was signed with\n"
" explicit extended key usage. Extended key usage can be encoded\n"
" as an object identifier or OpenSSL string representation.\n"
"--remote-cert-tls t: Require that peer certificate was signed with explicit\n"
" key usage and extended key usage based on RFC3280 TLS rules.\n"
" t = 'client' | 'server'.\n"
#ifdef ENABLE_PKCS11
"\n"
"PKCS#11 Options:\n"
"--pkcs11-providers provider ... : PKCS#11 provider to load.\n"
"--pkcs11-protected-authentication [0|1] ... : Use PKCS#11 protected authentication\n"
" path. Set for each provider.\n"
"--pkcs11-private-mode hex ... : PKCS#11 private key mode mask.\n"
" 0 : Try to determind automatically (default).\n"
" 1 : Use Sign.\n"
" 2 : Use SignRecover.\n"
" 4 : Use Decrypt.\n"
" 8 : Use Unwrap.\n"
"--pkcs11-cert-private [0|1] ... : Set if login should be performed before\n"
" certificate can be accessed. Set for each provider.\n"
"--pkcs11-pin-cache seconds : Number of seconds to cache PIN. The default is -1\n"
" cache until token is removed.\n"
"--pkcs11-id-management : Acquire identity from management interface.\n"
"--pkcs11-id serialized-id 'id' : Identity to use, get using standalone --show-pkcs11-ids\n"
#endif /* ENABLE_PKCS11 */
"\n"
"SSL Library information:\n"
"--show-ciphers : Show cipher algorithms to use with --cipher option.\n"
"--show-digests : Show message digest algorithms to use with --auth option.\n"
"--show-engines : Show hardware crypto accelerator engines (if available).\n"
"--show-tls : Show all TLS ciphers (TLS used only as a control channel).\n"
#ifdef WIN32
"\n"
"Windows Specific:\n"
"--win-sys path : Pathname of Windows system directory. Default is the pathname\n"
" from SystemRoot environment variable.\n"
"--ip-win32 method : When using --ifconfig on Windows, set TAP-Windows adapter\n"
" IP address using method = manual, netsh, ipapi,\n"
" dynamic, or adaptive (default = adaptive).\n"
" Dynamic method allows two optional parameters:\n"
" offset: DHCP server address offset (> -256 and < 256).\n"
" If 0, use network address, if >0, take nth\n"
" address forward from network address, if <0,\n"
" take nth address backward from broadcast\n"
" address.\n"
" Default is 0.\n"
" lease-time: Lease time in seconds.\n"
" Default is one year.\n"
"--route-method : Which method to use for adding routes on Windows?\n"
" adaptive (default) -- Try ipapi then fall back to exe.\n"
" ipapi -- Use IP helper API.\n"
" exe -- Call the route.exe shell command.\n"
"--dhcp-option type [parm] : Set extended TAP-Windows properties, must\n"
" be used with --ip-win32 dynamic. For options\n"
" which allow multiple addresses,\n"
" --dhcp-option must be repeated.\n"
" DOMAIN name : Set DNS suffix\n"
" DNS addr : Set domain name server address(es)\n"
" NTP : Set NTP server address(es)\n"
" NBDD : Set NBDD server address(es)\n"
" WINS addr : Set WINS server address(es)\n"
" NBT type : Set NetBIOS over TCP/IP Node type\n"
" 1: B, 2: P, 4: M, 8: H\n"
" NBS id : Set NetBIOS scope ID\n"
" DISABLE-NBT : Disable Netbios-over-TCP/IP.\n"
"--dhcp-renew : Ask Windows to renew the TAP adapter lease on startup.\n"
"--dhcp-pre-release : Ask Windows to release the previous TAP adapter lease on\n"
" startup.\n"
"--dhcp-release : Ask Windows to release the TAP adapter lease on shutdown.\n"
"--register-dns : Run net stop dnscache, net start dnscache, ipconfig /flushdns\n"
" and ipconfig /registerdns on connection initiation.\n"
"--tap-sleep n : Sleep for n seconds after TAP adapter open before\n"
" attempting to set adapter properties.\n"
"--pause-exit : When run from a console window, pause before exiting.\n"
"--service ex [0|1] : For use when " PACKAGE_NAME " is being instantiated by a\n"
" service, and should not be used directly by end-users.\n"
" ex is the name of an event object which, when\n"
" signaled, will cause " PACKAGE_NAME " to exit. A second\n"
" optional parameter controls the initial state of ex.\n"
"--show-net-up : Show " PACKAGE_NAME "'s view of routing table and net adapter list\n"
" after TAP adapter is up and routes have been added.\n"
#ifdef WIN32
"--block-outside-dns : Block DNS on other network adapters to prevent DNS leaks\n"
#endif
"Windows Standalone Options:\n"
"\n"
"--show-adapters : Show all TAP-Windows adapters.\n"
"--show-net : Show " PACKAGE_NAME "'s view of routing table and net adapter list.\n"
"--show-valid-subnets : Show valid subnets for --dev tun emulation.\n"
"--allow-nonadmin [TAP-adapter] : Allow " PACKAGE_NAME " running without admin privileges\n"
" to access TAP adapter.\n"
#endif
"\n"
"Generate a random key (only for non-TLS static key encryption mode):\n"
"--genkey : Generate a random key to be used as a shared secret,\n"
" for use with the --secret option.\n"
"--secret file : Write key to file.\n"
#endif /* ENABLE_CRYPTO */
#ifdef ENABLE_FEATURE_TUN_PERSIST
"\n"
"Tun/tap config mode (available with linux 2.4+):\n"
"--mktun : Create a persistent tunnel.\n"
"--rmtun : Remove a persistent tunnel.\n"
"--dev tunX|tapX : tun/tap device\n"
"--dev-type dt : Device type. See tunnel options above for details.\n"
"--user user : User to set privilege to.\n"
"--group group : Group to set privilege to.\n"
#endif
#ifdef ENABLE_PKCS11
"\n"
"PKCS#11 standalone options:\n"
#ifdef DEFAULT_PKCS11_MODULE
"--show-pkcs11-ids [provider] [cert_private] : Show PKCS#11 available ids.\n"
#else
"--show-pkcs11-ids provider [cert_private] : Show PKCS#11 available ids.\n"
#endif
" --verb option can be added *BEFORE* this.\n"
#endif /* ENABLE_PKCS11 */
"\n"
"General Standalone Options:\n"
#ifdef ENABLE_DEBUG
"--show-gateway : Show info about default gateway.\n"
#endif
;
#endif /* !ENABLE_SMALL */
/*
* This is where the options defaults go.
* Any option not explicitly set here
* will be set to 0.
*/
void
init_options (struct options *o, const bool init_gc)
{
CLEAR (*o);
if (init_gc)
{
gc_init (&o->gc);
o->gc_owned = true;
}
o->mode = MODE_POINT_TO_POINT;
o->topology = TOP_NET30;
o->ce.proto = PROTO_UDP;
o->ce.af = AF_UNSPEC;
o->ce.bind_ipv6_only = false;
o->ce.connect_retry_seconds = 5;
o->ce.connect_timeout = 10;
o->connect_retry_max = 0;
o->ce.local_port = o->ce.remote_port = OPENVPN_PORT;
o->verbosity = 1;
o->status_file_update_freq = 60;
o->status_file_version = 1;
o->ce.bind_local = true;
o->ce.tun_mtu = TUN_MTU_DEFAULT;
o->ce.link_mtu = LINK_MTU_DEFAULT;
o->ce.mtu_discover_type = -1;
o->ce.mssfix = MSSFIX_DEFAULT;
o->route_delay_window = 30;
o->resolve_retry_seconds = RESOLV_RETRY_INFINITE;
o->resolve_in_advance = false;
o->proto_force = -1;
#ifdef ENABLE_OCC
o->occ = true;
#endif
#ifdef ENABLE_MANAGEMENT
o->management_log_history_cache = 250;
o->management_echo_buffer_size = 100;
o->management_state_buffer_size = 100;
#endif
#ifdef ENABLE_FEATURE_TUN_PERSIST
o->persist_mode = 1;
#endif
#ifdef TARGET_LINUX
o->tuntap_options.txqueuelen = 100;
#endif
#ifdef WIN32
#if 0
o->tuntap_options.ip_win32_type = IPW32_SET_ADAPTIVE;
#else
o->tuntap_options.ip_win32_type = IPW32_SET_DHCP_MASQ;
#endif
o->tuntap_options.dhcp_lease_time = 31536000; /* one year */
o->tuntap_options.dhcp_masq_offset = 0; /* use network address as internal DHCP server address */
o->route_method = ROUTE_METHOD_ADAPTIVE;
o->block_outside_dns = false;
#endif
#if P2MP_SERVER
o->real_hash_size = 256;
o->virtual_hash_size = 256;
o->n_bcast_buf = 256;
o->tcp_queue_limit = 64;
o->max_clients = 1024;
o->max_routes_per_client = 256;
o->stale_routes_check_interval = 0;
o->ifconfig_pool_persist_refresh_freq = 600;
#endif
#if P2MP
o->scheduled_exit_interval = 5;
o->server_poll_timeout = 0;
#endif
#ifdef ENABLE_CRYPTO
o->ciphername = "BF-CBC";
o->ciphername_defined = true;
o->authname = "SHA1";
o->authname_defined = true;
o->prng_hash = "SHA1";
o->prng_nonce_secret_len = 16;
o->replay = true;
o->replay_window = DEFAULT_SEQ_BACKTRACK;
o->replay_time = DEFAULT_TIME_BACKTRACK;
o->use_iv = true;
o->key_direction = KEY_DIRECTION_BIDIRECTIONAL;
#ifdef ENABLE_PREDICTION_RESISTANCE
o->use_prediction_resistance = false;
#endif
o->key_method = 2;
o->tls_timeout = 2;
o->renegotiate_seconds = 3600;
o->handshake_window = 60;
o->transition_window = 3600;
o->ecdh_curve = NULL;
#ifdef ENABLE_X509ALTUSERNAME
o->x509_username_field = X509_USERNAME_FIELD_DEFAULT;
#endif
#endif /* ENABLE_CRYPTO */
#ifdef ENABLE_PKCS11
o->pkcs11_pin_cache_period = -1;
#endif /* ENABLE_PKCS11 */
/* tmp is only used in P2MP server context */
#if P2MP_SERVER
/* Set default --tmp-dir */
#ifdef WIN32
/* On Windows, find temp dir via enviroment variables */
o->tmp_dir = win_get_tempdir();
#else
/* Non-windows platforms use $TMPDIR, and if not set, default to '/tmp' */
o->tmp_dir = getenv("TMPDIR");
if( !o->tmp_dir ) {
o->tmp_dir = "/tmp";
}
#endif /* WIN32 */
#endif /* P2MP_SERVER */
}
void
uninit_options (struct options *o)
{
if (o->gc_owned)
{
gc_free (&o->gc);
}
}
#ifndef ENABLE_SMALL
#define SHOW_PARM(name, value, format) msg(D_SHOW_PARMS, " " #name " = " format, (value))
#define SHOW_STR(var) SHOW_PARM(var, (o->var ? o->var : "[UNDEF]"), "'%s'")
#define SHOW_INT(var) SHOW_PARM(var, o->var, "%d")
#define SHOW_UINT(var) SHOW_PARM(var, o->var, "%u")
#define SHOW_UNSIGNED(var) SHOW_PARM(var, o->var, "0x%08x")
#define SHOW_BOOL(var) SHOW_PARM(var, (o->var ? "ENABLED" : "DISABLED"), "%s");
#endif
void
setenv_connection_entry (struct env_set *es,
const struct connection_entry *e,
const int i)
{
setenv_str_i (es, "proto", proto2ascii (e->proto, e->af, false), i);
setenv_str_i (es, "local", e->local, i);
setenv_str_i (es, "local_port", e->local_port, i);
setenv_str_i (es, "remote", e->remote, i);
setenv_str_i (es, "remote_port", e->remote_port, i);
if (e->http_proxy_options)
{
setenv_str_i (es, "http_proxy_server", e->http_proxy_options->server, i);
setenv_str_i (es, "http_proxy_port", e->http_proxy_options->port, i);
}
if (e->socks_proxy_server)
{
setenv_str_i (es, "socks_proxy_server", e->socks_proxy_server, i);
setenv_str_i (es, "socks_proxy_port", e->socks_proxy_port, i);
}
}
void
setenv_settings (struct env_set *es, const struct options *o)
{
setenv_str (es, "config", o->config);
setenv_int (es, "verb", o->verbosity);
setenv_int (es, "daemon", o->daemon);
setenv_int (es, "daemon_log_redirect", o->log);
setenv_unsigned (es, "daemon_start_time", time(NULL));
setenv_int (es, "daemon_pid", platform_getpid());
if (o->connection_list)
{
int i;
for (i = 0; i < o->connection_list->len; ++i)
setenv_connection_entry (es, o->connection_list->array[i], i+1);
}
else
setenv_connection_entry (es, &o->ce, 1);
}
static in_addr_t
get_ip_addr (const char *ip_string, int msglevel, bool *error)
{
unsigned int flags = GETADDR_HOST_ORDER;
bool succeeded = false;
in_addr_t ret;
if (msglevel & M_FATAL)
flags |= GETADDR_FATAL;
ret = getaddr (flags, ip_string, 0, &succeeded, NULL);
if (!succeeded && error)
*error = true;
return ret;
}
/* helper: parse a text string containing an IPv6 address + netbits
* in "standard format" (2001:dba::/32)
* "/nn" is optional, default to /64 if missing
*
* return true if parsing succeeded, modify *network and *netbits
*/
bool
get_ipv6_addr( const char * prefix_str, struct in6_addr *network,
unsigned int * netbits, int msglevel)
{
char * sep, * endp;
int bits;
struct in6_addr t_network;
sep = strchr( prefix_str, '/' );
if ( sep == NULL )
{
bits = 64;
}
else
{
bits = strtol( sep+1, &endp, 10 );
if ( *endp != '\0' || bits < 0 || bits > 128 )
{
msg (msglevel, "IPv6 prefix '%s': invalid '/bits' spec", prefix_str);
return false;
}
}
/* temporary replace '/' in caller-provided string with '\0', otherwise
* inet_pton() will refuse prefix string
* (alternative would be to strncpy() the prefix to temporary buffer)
*/
if ( sep != NULL ) *sep = '\0';
if ( inet_pton( AF_INET6, prefix_str, &t_network ) != 1 )
{
msg (msglevel, "IPv6 prefix '%s': invalid IPv6 address", prefix_str);
return false;
}
if ( sep != NULL ) *sep = '/';
if ( netbits != NULL )
{
*netbits = bits;
}
if ( network != NULL )
{