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/* Dropbear SSH
* Copyright (c) 2002,2003 Matt Johnston
* All rights reserved. See LICENSE for the license. */
#ifndef _OPTIONS_H_
#define _OPTIONS_H_
/******************************************************************
* Define compile-time options below - the "#ifndef DROPBEAR_XXX .... #endif"
* parts are to allow for commandline -DDROPBEAR_XXX options etc.
******************************************************************/
#ifndef DROPBEAR_DEFPORT
#define DROPBEAR_DEFPORT "22"
#endif
#ifndef DROPBEAR_DEFADDRESS
/* Listen on all interfaces */
#define DROPBEAR_DEFADDRESS ""
#endif
/* Default hostkey paths - these can be specified on the command line */
#ifndef DSS_PRIV_FILENAME
#define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
#endif
#ifndef RSA_PRIV_FILENAME
#define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
#endif
/* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
* on chosen ports and keeps accepting connections. This is the default.
*
* Set INETD_MODE if you want to be able to run Dropbear with inetd (or
* similar), where it will use stdin/stdout for connections, and each process
* lasts for a single connection. Dropbear should be invoked with the -i flag
* for inetd, and can only accept IPv4 connections.
*
* Both of these flags can be defined at once, don't compile without at least
* one of them. */
#define NON_INETD_MODE
#define INETD_MODE
/* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
* perhaps 20% slower for pubkey operations (it is probably worth experimenting
* if you want to use this) */
/*#define NO_FAST_EXPTMOD*/
/* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
several kB in binary size however will make the symmetrical ciphers and hashes
slower, perhaps by 50%. Recommended for small systems that aren't doing
much traffic. */
/*#define DROPBEAR_SMALL_CODE*/
/* Enable X11 Forwarding - server only */
#define ENABLE_X11FWD
/* Enable TCP Fowarding */
/* 'Local' is "-L" style (client listening port forwarded via server)
* 'Remote' is "-R" style (server listening port forwarded via client) */
#define ENABLE_CLI_LOCALTCPFWD
#define ENABLE_CLI_REMOTETCPFWD
#define ENABLE_SVR_LOCALTCPFWD
#define ENABLE_SVR_REMOTETCPFWD
/* Enable Authentication Agent Forwarding */
#define ENABLE_SVR_AGENTFWD
#define ENABLE_CLI_AGENTFWD
/* Note: Both ENABLE_CLI_PROXYCMD and ENABLE_CLI_NETCAT must be set to
* allow multihop dbclient connections */
/* Allow using -J <proxycommand> to run the connection through a
pipe to a program, rather the normal TCP connection */
#define ENABLE_CLI_PROXYCMD
/* Enable "Netcat mode" option. This will forward standard input/output
* to a remote TCP-forwarded connection */
#define ENABLE_CLI_NETCAT
/* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
#define ENABLE_USER_ALGO_LIST
/* Encryption - at least one required.
* Protocol RFC requires 3DES and recommends AES128 for interoperability.
* Including multiple keysize variants the same cipher
* (eg AES256 as well as AES128) will result in a minimal size increase.*/
#define DROPBEAR_AES128
#define DROPBEAR_3DES
#define DROPBEAR_AES256
/* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
/*#define DROPBEAR_BLOWFISH*/
#define DROPBEAR_TWOFISH256
#define DROPBEAR_TWOFISH128
/* Enable "Counter Mode" for ciphers. This is more secure than normal
* CBC mode against certain attacks. This adds around 1kB to binary
* size and is recommended for most cases */
#define DROPBEAR_ENABLE_CTR_MODE
/* You can compile with no encryption if you want. In some circumstances
* this could be safe security-wise, though make sure you know what
* you're doing. Anyone can see everything that goes over the wire, so
* the only safe auth method is public key. */
/* #define DROPBEAR_NONE_CIPHER */
/* Message Integrity - at least one required.
* Protocol RFC requires sha1 and recommends sha1-96.
* sha1-96 is of use for slow links as it has a smaller overhead.
*
* There's no reason to disable sha1 or sha1-96 to save space since it's
* used for the random number generator and public-key cryptography anyway.
* Disabling it here will just stop it from being used as the integrity portion
* of the ssh protocol.
*
* These hashes are also used for public key fingerprints in logs.
* If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
* which are not the standard form. */
#define DROPBEAR_SHA1_HMAC
#define DROPBEAR_SHA1_96_HMAC
/*#define DROPBEAR_SHA2_256_HMAC*/
/*#define DROPBEAR_SHA2_512_HMAC*/
#define DROPBEAR_MD5_HMAC
/* You can also disable integrity. Don't bother disabling this if you're
* still using a cipher, it's relatively cheap. If you disable this it's dead
* simple to run arbitrary commands on the remote host. Beware. */
/* #define DROPBEAR_NONE_INTEGRITY */
/* Hostkey/public key algorithms - at least one required, these are used
* for hostkey as well as for verifying signatures with pubkey auth.
* Removing either of these won't save very much space.
* SSH2 RFC Draft requires dss, recommends rsa */
#define DROPBEAR_RSA
#define DROPBEAR_DSS
/* RSA can be vulnerable to timing attacks which use the time required for
* signing to guess the private key. Blinding avoids this attack, though makes
* signing operations slightly slower. */
#define RSA_BLINDING
/* Control the memory/performance/compression tradeoff for zlib.
* Set windowBits=8 for least memory usage, see your system's
* zlib.h for full details.
* Default settings (windowBits=15) will use 256kB for compression
* windowBits=8 will use 129kB for compression.
* Both modes will use ~35kB for decompression (using windowBits=15 for
* interoperability) */
#ifndef DROPBEAR_ZLIB_WINDOW_BITS
#define DROPBEAR_ZLIB_WINDOW_BITS 15
#endif
/* Whether to do reverse DNS lookups. */
//#define DO_HOST_LOOKUP
/* Whether to print the message of the day (MOTD). This doesn't add much code
* size */
#define DO_MOTD
/* The MOTD file path */
#ifndef MOTD_FILENAME
#define MOTD_FILENAME "/etc/motd"
#endif
/* Authentication Types - at least one required.
RFC Draft requires pubkey auth, and recommends password */
/* Note: PAM auth is quite simple and only works for PAM modules which just do
* a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
* It's useful for systems like OS X where standard password crypts don't work
* but there's an interface via a PAM module. It won't work for more complex
* PAM challenge/response.
* You can't enable both PASSWORD and PAM. */
#define ENABLE_SVR_PASSWORD_AUTH
/* PAM requires ./configure --enable-pam */
//#define ENABLE_SVR_PAM_AUTH
#define ENABLE_SVR_PUBKEY_AUTH
/* Whether to take public key options in
* authorized_keys file into account */
#ifdef ENABLE_SVR_PUBKEY_AUTH
#define ENABLE_SVR_PUBKEY_OPTIONS
#endif
#define ENABLE_CLI_PASSWORD_AUTH
#define ENABLE_CLI_PUBKEY_AUTH
#define ENABLE_CLI_INTERACT_AUTH
/* This variable can be used to set a password for client
* authentication on the commandline. Beware of platforms
* that don't protect environment variables of processes etc. Also
* note that it will be provided for all "hidden" client-interactive
* style prompts - if you want something more sophisticated, use
* SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
#define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
/* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of
* a helper program for the ssh client. The helper program should be
* specified in the SSH_ASKPASS environment variable, and dbclient
* should be run with DISPLAY set and no tty. The program should
* return the password on standard output */
/*#define ENABLE_CLI_ASKPASS_HELPER*/
/* Send a real auth request first rather than requesting a list of available methods.
* It saves a network round trip at login but prevents immediate login to
* accounts with no password, and might be rejected by some strict servers (none
* encountered yet) - hence it isn't enabled by default. */
/* #define CLI_IMMEDIATE_AUTH */
/* Source for randomness. This must be able to provide hundreds of bytes per SSH
* connection without blocking. In addition /dev/random is used for seeding
* rsa/dss key generation */
#define DROPBEAR_URANDOM_DEV "/dev/urandom"
/* Set this to use PRNGD or EGD instead of /dev/urandom or /dev/random */
/*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
/* Specify the number of clients we will allow to be connected but
* not yet authenticated. After this limit, connections are rejected */
/* The first setting is per-IP, to avoid denial of service */
#ifndef MAX_UNAUTH_PER_IP
#define MAX_UNAUTH_PER_IP 5
#endif
/* And then a global limit to avoid chewing memory if connections
* come from many IPs */
#ifndef MAX_UNAUTH_CLIENTS
#define MAX_UNAUTH_CLIENTS 30
#endif
/* Maximum number of failed authentication tries (server option) */
#ifndef MAX_AUTH_TRIES
#define MAX_AUTH_TRIES 10
#endif
/* The default file to store the daemon's process ID, for shutdown
scripts etc. This can be overridden with the -P flag */
#ifndef DROPBEAR_PIDFILE
#define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
#endif
/* The command to invoke for xauth when using X11 forwarding.
* "-q" for quiet */
#ifndef XAUTH_COMMAND
#define XAUTH_COMMAND "/usr/bin/X11/xauth -q"
#endif
/* if you want to enable running an sftp server (such as the one included with
* OpenSSH), set the path below. If the path isn't defined, sftp will not
* be enabled */
#ifndef SFTPSERVER_PATH
#define SFTPSERVER_PATH "/usr/libexec/sftp-server"
#endif
/* This is used by the scp binary when used as a client binary. If you're
* not using the Dropbear client, you'll need to change it */
#define _PATH_SSH_PROGRAM "/usr/bin/dbclient"
/* Whether to log commands executed by a client. This only logs the
* (single) command sent to the server, not what a user did in a
* shell/sftp session etc. */
/* #define LOG_COMMANDS */
/* Window size limits. These tend to be a trade-off between memory
usage and network performance: */
/* Size of the network receive window. This amount of memory is allocated
as a per-channel receive buffer. Increasing this value can make a
significant difference to network performance. 24kB was empirically
chosen for a 100mbit ethernet network. The value can be altered at
runtime with the -W argument. */
#ifndef DEFAULT_RECV_WINDOW
#define DEFAULT_RECV_WINDOW 24576
#endif
/* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
in order to interoperate with other implementations */
#ifndef RECV_MAX_PAYLOAD_LEN
#define RECV_MAX_PAYLOAD_LEN 32768
#endif
/* Maximum size of a transmitted data packet - this can be any value,
though increasing it may not make a significant difference. */
#ifndef TRANS_MAX_PAYLOAD_LEN
#define TRANS_MAX_PAYLOAD_LEN 16384
#endif
/* Ensure that data is transmitted every KEEPALIVE seconds. This can
be overridden at runtime with -K. 0 disables keepalives */
#define DEFAULT_KEEPALIVE 0
/* Ensure that data is received within IDLE_TIMEOUT seconds. This can
be overridden at runtime with -I. 0 disables idle timeouts */
#define DEFAULT_IDLE_TIMEOUT 0
/* The default path. This will often get replaced by the shell */
#define DEFAULT_PATH "/usr/bin:/bin"
/* Some other defines (that mostly should be left alone) are defined
* in sysoptions.h */
#include "sysoptions.h"
#endif /* _OPTIONS_H_ */