309 lines
11 KiB
C
309 lines
11 KiB
C
/* Dropbear SSH
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* Copyright (c) 2002,2003 Matt Johnston
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* All rights reserved. See LICENSE for the license. */
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#ifndef _OPTIONS_H_
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#define _OPTIONS_H_
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/******************************************************************
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* Define compile-time options below - the "#ifndef DROPBEAR_XXX .... #endif"
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* parts are to allow for commandline -DDROPBEAR_XXX options etc.
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******************************************************************/
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#ifndef DROPBEAR_DEFPORT
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#define DROPBEAR_DEFPORT "22"
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#endif
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#ifndef DROPBEAR_DEFADDRESS
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/* Listen on all interfaces */
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#define DROPBEAR_DEFADDRESS ""
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#endif
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/* Default hostkey paths - these can be specified on the command line */
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#ifndef DSS_PRIV_FILENAME
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#define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
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#endif
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#ifndef RSA_PRIV_FILENAME
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#define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
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#endif
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#ifndef PSW_PRIV_FILENAME
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#define PSW_PRIV_FILENAME "/var/tmp/dropbear/dropbearpwd"
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#endif
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/* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
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* on chosen ports and keeps accepting connections. This is the default.
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*
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* Set INETD_MODE if you want to be able to run Dropbear with inetd (or
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* similar), where it will use stdin/stdout for connections, and each process
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* lasts for a single connection. Dropbear should be invoked with the -i flag
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* for inetd, and can only accept IPv4 connections.
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*
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* Both of these flags can be defined at once, don't compile without at least
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* one of them. */
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#define NON_INETD_MODE
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#define INETD_MODE
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/* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
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* perhaps 20% slower for pubkey operations (it is probably worth experimenting
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* if you want to use this) */
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/*#define NO_FAST_EXPTMOD*/
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/* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
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several kB in binary size however will make the symmetrical ciphers and hashes
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slower, perhaps by 50%. Recommended for small systems that aren't doing
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much traffic. */
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/*#define DROPBEAR_SMALL_CODE*/
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/* Enable X11 Forwarding - server only */
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#define ENABLE_X11FWD
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/* Enable TCP Fowarding */
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/* 'Local' is "-L" style (client listening port forwarded via server)
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* 'Remote' is "-R" style (server listening port forwarded via client) */
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#define ENABLE_CLI_LOCALTCPFWD
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#define ENABLE_CLI_REMOTETCPFWD
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#define ENABLE_SVR_LOCALTCPFWD
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#define ENABLE_SVR_REMOTETCPFWD
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/* Enable Authentication Agent Forwarding */
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#define ENABLE_SVR_AGENTFWD
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#define ENABLE_CLI_AGENTFWD
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/* Note: Both ENABLE_CLI_PROXYCMD and ENABLE_CLI_NETCAT must be set to
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* allow multihop dbclient connections */
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/* Allow using -J <proxycommand> to run the connection through a
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pipe to a program, rather the normal TCP connection */
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#define ENABLE_CLI_PROXYCMD
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/* Enable "Netcat mode" option. This will forward standard input/output
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* to a remote TCP-forwarded connection */
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#define ENABLE_CLI_NETCAT
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/* Encryption - at least one required.
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* Protocol RFC requires 3DES and recommends AES128 for interoperability.
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* Including multiple keysize variants the same cipher
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* (eg AES256 as well as AES128) will result in a minimal size increase.*/
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#define DROPBEAR_AES128
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#define DROPBEAR_3DES
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#define DROPBEAR_AES256
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/* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
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/*#define DROPBEAR_BLOWFISH*/
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#define DROPBEAR_TWOFISH256
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#define DROPBEAR_TWOFISH128
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/* Enable "Counter Mode" for ciphers. This is more secure than normal
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* CBC mode against certain attacks. This adds around 1kB to binary
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* size and is recommended for most cases */
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#define DROPBEAR_ENABLE_CTR_MODE
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/* Message Integrity - at least one required.
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* Protocol RFC requires sha1 and recommends sha1-96.
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* sha1-96 may be of use for slow links, as it has a smaller overhead.
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*
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* Note: there's no point disabling sha1 to save space, since it's used
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* for the random number generator and public-key cryptography anyway.
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* Disabling it here will just stop it from being used as the integrity portion
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* of the ssh protocol.
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*
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* These hashes are also used for public key fingerprints in logs.
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* If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
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* which are not the standard form. */
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#define DROPBEAR_SHA1_HMAC
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#define DROPBEAR_SHA1_96_HMAC
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#define DROPBEAR_MD5_HMAC
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/* Hostkey/public key algorithms - at least one required, these are used
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* for hostkey as well as for verifying signatures with pubkey auth.
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* Removing either of these won't save very much space.
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* SSH2 RFC Draft requires dss, recommends rsa */
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#define DROPBEAR_RSA
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#define DROPBEAR_DSS
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#define DROPBEAR_PWD 1
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/* RSA can be vulnerable to timing attacks which use the time required for
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* signing to guess the private key. Blinding avoids this attack, though makes
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* signing operations slightly slower. */
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#define RSA_BLINDING
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/* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss,
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* rather than just from the random byte source. Undefining this will save you
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* ~4k in binary size with static uclibc, but your DSS hostkey could be exposed
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* if the random number source isn't good. It happened to Sony.
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* On systems with a decent random source this isn't required. */
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/* #define DSS_PROTOK */
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/* Control the memory/performance/compression tradeoff for zlib.
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* Set windowBits=8 for least memory usage, see your system's
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* zlib.h for full details.
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* Default settings (windowBits=15) will use 256kB for compression
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* windowBits=8 will use 129kB for compression.
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* Both modes will use ~35kB for decompression (using windowBits=15 for
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* interoperability) */
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#ifndef DROPBEAR_ZLIB_WINDOW_BITS
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#define DROPBEAR_ZLIB_WINDOW_BITS 15
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#endif
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/* Whether to do reverse DNS lookups. */
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#define DO_HOST_LOOKUP
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/* Whether to print the message of the day (MOTD). This doesn't add much code
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* size */
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#define DO_MOTD
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/* The MOTD file path */
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#ifndef MOTD_FILENAME
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#define MOTD_FILENAME "/etc/motd"
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#endif
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/* Authentication Types - at least one required.
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RFC Draft requires pubkey auth, and recommends password */
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/* Note: PAM auth is quite simple and only works for PAM modules which just do
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* a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
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* It's useful for systems like OS X where standard password crypts don't work
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* but there's an interface via a PAM module. It won't work for more complex
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* PAM challenge/response.
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* You can't enable both PASSWORD and PAM. */
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#define ENABLE_SVR_PASSWORD_AUTH
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/* PAM requires ./configure --enable-pam */
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/*#define ENABLE_SVR_PAM_AUTH*/
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#define ENABLE_SVR_PUBKEY_AUTH
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/* Whether to take public key options in
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* authorized_keys file into account */
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#ifdef ENABLE_SVR_PUBKEY_AUTH
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#define ENABLE_SVR_PUBKEY_OPTIONS
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#endif
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/* Define this to allow logging in to accounts that have no password specified.
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* Public key logins are allowed for blank-password accounts regardless of this
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* setting. PAM is not affected by this setting, it uses the normal pam.d
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* settings ('nullok' option) */
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/* #define ALLOW_BLANK_PASSWORD */
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#define ENABLE_CLI_PASSWORD_AUTH
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#define ENABLE_CLI_PUBKEY_AUTH
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#define ENABLE_CLI_INTERACT_AUTH
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/* This variable can be used to set a password for client
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* authentication on the commandline. Beware of platforms
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* that don't protect environment variables of processes etc. Also
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* note that it will be provided for all "hidden" client-interactive
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* style prompts - if you want something more sophisticated, use
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* SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
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#define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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/* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of
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* a helper program for the ssh client. The helper program should be
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* specified in the SSH_ASKPASS environment variable, and dbclient
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* should be run with DISPLAY set and no tty. The program should
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* return the password on standard output */
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/*#define ENABLE_CLI_ASKPASS_HELPER*/
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/* Random device to use - define either DROPBEAR_RANDOM_DEV or
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* DROPBEAR_PRNGD_SOCKET.
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* DROPBEAR_RANDOM_DEV is recommended on hosts with a good /dev/(u)random,
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* otherwise use run prngd (or egd if you want), specifying the socket.
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* The device will be queried for a few dozen bytes of seed a couple of times
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* per session (or more for very long-lived sessions). */
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/* We'll use /dev/urandom by default, since /dev/random is too much hassle.
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* If system developers aren't keeping seeds between boots nor getting
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* any entropy from somewhere it's their own fault. */
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#define DROPBEAR_RANDOM_DEV "/dev/urandom"
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/* prngd must be manually set up to produce output */
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/*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
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/* Specify the number of clients we will allow to be connected but
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* not yet authenticated. After this limit, connections are rejected */
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/* The first setting is per-IP, to avoid denial of service */
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#ifndef MAX_UNAUTH_PER_IP
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#define MAX_UNAUTH_PER_IP 5
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#endif
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/* And then a global limit to avoid chewing memory if connections
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* come from many IPs */
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#ifndef MAX_UNAUTH_CLIENTS
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#define MAX_UNAUTH_CLIENTS 30
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#endif
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/* Maximum number of failed authentication tries (server option) */
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#ifndef MAX_AUTH_TRIES
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#define MAX_AUTH_TRIES 10
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#endif
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/* The default file to store the daemon's process ID, for shutdown
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scripts etc. This can be overridden with the -P flag */
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#ifndef DROPBEAR_PIDFILE
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#define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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#endif
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/* The command to invoke for xauth when using X11 forwarding.
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* "-q" for quiet */
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#ifndef XAUTH_COMMAND
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#define XAUTH_COMMAND "/usr/bin/X11/xauth -q"
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#endif
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/* if you want to enable running an sftp server (such as the one included with
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* OpenSSH), set the path below. If the path isn't defined, sftp will not
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* be enabled */
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#ifndef SFTPSERVER_PATH
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#define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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#endif
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/* This is used by the scp binary when used as a client binary. If you're
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* not using the Dropbear client, you'll need to change it */
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#define _PATH_SSH_PROGRAM "/usr/bin/dbclient"
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/* Whether to log commands executed by a client. This only logs the
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* (single) command sent to the server, not what a user did in a
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* shell/sftp session etc. */
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/* #define LOG_COMMANDS */
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/* Window size limits. These tend to be a trade-off between memory
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usage and network performance: */
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/* Size of the network receive window. This amount of memory is allocated
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as a per-channel receive buffer. Increasing this value can make a
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significant difference to network performance. 24kB was empirically
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chosen for a 100mbit ethernet network. The value can be altered at
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runtime with the -W argument. */
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#ifndef DEFAULT_RECV_WINDOW
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#define DEFAULT_RECV_WINDOW 24576
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#endif
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/* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
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in order to interoperate with other implementations */
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#ifndef RECV_MAX_PAYLOAD_LEN
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#define RECV_MAX_PAYLOAD_LEN 32768
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#endif
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/* Maximum size of a transmitted data packet - this can be any value,
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though increasing it may not make a significant difference. */
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#ifndef TRANS_MAX_PAYLOAD_LEN
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#define TRANS_MAX_PAYLOAD_LEN 16384
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#endif
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/* Ensure that data is transmitted every KEEPALIVE seconds. This can
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be overridden at runtime with -K. 0 disables keepalives */
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#define DEFAULT_KEEPALIVE 0
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/* Ensure that data is received within IDLE_TIMEOUT seconds. This can
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be overridden at runtime with -I. 0 disables idle timeouts */
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#define DEFAULT_IDLE_TIMEOUT 0
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/* The default path. This will often get replaced by the shell */
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#define DEFAULT_PATH "/usr/bin:/bin"
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#define USER_ACCOUNT "dropbear"
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/* Some other defines (that mostly should be left alone) are defined
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* in sysoptions.h */
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#include "sysoptions.h"
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#endif /* _OPTIONS_H_ */
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