From 32a28d0d9cf7c567671366d6ec71df87627e2c49 Mon Sep 17 00:00:00 2001 From: Matt Johnston Date: Wed, 4 May 2016 15:33:40 +0200 Subject: Convert #ifdef to #if, other build changes --- default_options.h.in | 312 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 312 insertions(+) create mode 100644 default_options.h.in (limited to 'default_options.h.in') diff --git a/default_options.h.in b/default_options.h.in new file mode 100644 index 0000000..e81eaae --- /dev/null +++ b/default_options.h.in @@ -0,0 +1,312 @@ +#ifndef DROPBEAR_DEFAULT_OPTIONS_H_ +#define DROPBEAR_DEFAULT_OPTIONS_H_ +/* + > > > Read This < < < + +default_options.h.in (this file) documents compile-time options, and provides +default values. + +Local customisation should be added to localoptions.h which is +used if it exists. Options defined there will override any options in this +file (#ifndef guards added by ifndef_wrapper.sh). + +Options can also be defined with -DDROPBEAR_XXX Makefile CFLAGS + +IMPORTANT: Many options will require "make clean" after changes */ + +#define DROPBEAR_DEFPORT "22" + +/* Listen on all interfaces */ +#define DROPBEAR_DEFADDRESS "" + +/* Default hostkey paths - these can be specified on the command line */ +#define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key" +#define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key" +#define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_host_key" + +/* 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 1 +#define INETD_MODE 1 + +/* 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 1 + +/* Enable X11 Forwarding - server only */ +#define DROPBEAR_X11FWD 1 + +/* Enable TCP Fowarding */ +/* 'Local' is "-L" style (client listening port forwarded via server) + * 'Remote' is "-R" style (server listening port forwarded via client) */ + +#define DROPBEAR_CLI_LOCALTCPFWD 1 +#define DROPBEAR_CLI_REMOTETCPFWD 1 + +#define DROPBEAR_SVR_LOCALTCPFWD 1 +#define DROPBEAR_SVR_REMOTETCPFWD 1 + +/* Enable Authentication Agent Forwarding */ +#define DROPBEAR_SVR_AGENTFWD 1 +#define DROPBEAR_CLI_AGENTFWD 1 + + +/* Note: Both DROPBEAR_CLI_PROXYCMD and DROPBEAR_CLI_NETCAT must be set to + * allow multihop dbclient connections */ + +/* Allow using -J to run the connection through a + pipe to a program, rather the normal TCP connection */ +#define DROPBEAR_CLI_PROXYCMD 1 + +/* Enable "Netcat mode" option. This will forward standard input/output + * to a remote TCP-forwarded connection */ +#define DROPBEAR_CLI_NETCAT 1 + +/* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */ +#define ENABLE_USER_ALGO_LIST 1 + +/* 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 1 +#define DROPBEAR_3DES 1 +#define DROPBEAR_AES256 1 +/* Compiling in Blowfish will add ~6kB to runtime heap memory usage */ +/*#define DROPBEAR_BLOWFISH*/ +#define DROPBEAR_TWOFISH256 1 +#define DROPBEAR_TWOFISH128 1 + +/* Enable CBC mode for ciphers. This has security issues though + * is the most compatible with older SSH implementations */ +#define DROPBEAR_ENABLE_CBC_MODE 1 + +/* Enable "Counter Mode" for ciphers. This is more secure than normal + * CBC mode against certain attacks. It is recommended for security + * and forwards compatibility */ +#define DROPBEAR_ENABLE_CTR_MODE 1 + +/* Twofish counter mode is disabled by default because it +has not been tested for interoperability with other SSH implementations. +If you test it please contact the Dropbear author */ +#define DROPBEAR_TWOFISH_CTR 0 + +/* Message integrity. sha2-256 is recommended as a default, + sha1 for compatibility */ +#define DROPBEAR_SHA1_HMAC 1 +#define DROPBEAR_SHA1_96_HMAC 1 +#define DROPBEAR_SHA2_256_HMAC 1 +/* Default is to include it is sha512 is being compiled in for ECDSA */ +#define DROPBEAR_SHA2_512_HMAC (DROPBEAR_ECDSA) + +/* XXX needed for fingerprints */ +#define DROPBEAR_MD5_HMAC 0 + +/* 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. + * RSA is recommended + * DSS may be necessary to connect to some systems though + is not recommended for new keys */ +#define DROPBEAR_RSA 1 +#define DROPBEAR_DSS 1 +/* ECDSA is significantly faster than RSA or DSS. Compiling in ECC + * code (either ECDSA or ECDH) increases binary size - around 30kB + * on x86-64 */ +#define DROPBEAR_ECDSA 1 + +/* Add runtime flag "-R" to generate hostkeys as-needed when the first + connection using that key type occurs. + This avoids the need to otherwise run "dropbearkey" and avoids some problems + with badly seeded /dev/urandom when systems first boot. */ +#define DROPBEAR_DELAY_HOSTKEY 1 + +/* Enable Curve25519 for key exchange. This is another elliptic + * curve method with good security properties. Increases binary size + * by ~8kB on x86-64 */ +#define DROPBEAR_CURVE25519 1 + +/* Enable elliptic curve Diffie Hellman key exchange, see note about + * ECDSA above */ +#define DROPBEAR_ECDH 1 + +/* Key exchange algorithm. + * group14_sha1 - 2048 bit, sha1 + * group14_sha256 - 2048 bit, sha2-256 + * group16 - 4096 bit, sha2-512 + * group1 - 1024 bit, sha1 + * + * group14 is supported by most implementations. + * group16 provides a greater strength level but is slower and increases binary size + * group1 is too small for security though is necessary if you need + compatibility with some implementations such as Dropbear versions < 0.53 + */ +#define DROPBEAR_DH_GROUP1 1 +#define DROPBEAR_DH_GROUP14_SHA1 1 +#define DROPBEAR_DH_GROUP14_SHA256 1 +#define DROPBEAR_DH_GROUP16 0 + +/* 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) */ +#define DROPBEAR_ZLIB_WINDOW_BITS 15 + +/* Whether to do reverse DNS lookups. */ +#define DO_HOST_LOOKUP 0 + +/* Whether to print the message of the day (MOTD). */ +#define DO_MOTD 0 + +/* The MOTD file path */ +#define MOTD_FILENAME "/etc/motd" + +/* 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. */ + +/* This requires crypt() */ +#ifdef HAVE_CRYPT +#define DROPBEAR_SVR_PASSWORD_AUTH 1 +#else +#define DROPBEAR_SVR_PASSWORD_AUTH 0 +#endif +/* PAM requires ./configure --enable-pam */ +#define DROPBEAR_SVR_PAM_AUTH 0 +#define DROPBEAR_SVR_PUBKEY_AUTH 1 + +/* Whether to take public key options in + * authorized_keys file into account */ +#define DROPBEAR_SVR_PUBKEY_OPTIONS 1 + +/* This requires getpass. */ +#ifdef HAVE_GETPASS +#define DROPBEAR_CLI_PASSWORD_AUTH 1 +#define DROPBEAR_CLI_INTERACT_AUTH 1 +#endif +#define DROPBEAR_CLI_PUBKEY_AUTH 1 + +/* A default argument for dbclient -i . +Homedir is prepended unless path begins with / */ +#define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear" + +/* 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 DROPBEAR_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 DROPBEAR_CLI_ASKPASS_HELPER 0 + +/* Save a network roundtrip by sendng a real auth request immediately after + * sending a query for the available methods. It is at the expense of < 100 + * bytes of extra network traffic. This is not yet enabled by default since it + * could cause problems with non-compliant servers */ +#define DROPBEAR_CLI_IMMEDIATE_AUTH 0 + +/* 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 */ +#define MAX_UNAUTH_PER_IP 5 + +/* And then a global limit to avoid chewing memory if connections + * come from many IPs */ +#define MAX_UNAUTH_CLIENTS 30 + +/* Maximum number of failed authentication tries (server option) */ +#define MAX_AUTH_TRIES 10 + +/* The default file to store the daemon's process ID, for shutdown + scripts etc. This can be overridden with the -P flag */ +#define DROPBEAR_PIDFILE "/var/run/dropbear.pid" + +/* The command to invoke for xauth when using X11 forwarding. + * "-q" for quiet */ +#define XAUTH_COMMAND "/usr/bin/xauth -q" + +/* 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 */ +#define SFTPSERVER_PATH "/usr/libexec/sftp-server" + +/* 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 DROPBEAR_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 0 + +/* 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. */ +#define DEFAULT_RECV_WINDOW 24576 +/* Maximum size of a received SSH data packet - this _MUST_ be >= 32768 + in order to interoperate with other implementations */ +#define RECV_MAX_PAYLOAD_LEN 32768 +/* Maximum size of a transmitted data packet - this can be any value, + though increasing it may not make a significant difference. */ +#define TRANS_MAX_PAYLOAD_LEN 16384 + +/* Ensure that data is transmitted every KEEPALIVE seconds. This can +be overridden at runtime with -K. 0 disables keepalives */ +#define DEFAULT_KEEPALIVE 0 + +/* If this many KEEPALIVES are sent with no packets received from the +other side, exit. Not run-time configurable - if you have a need +for runtime configuration please mail the Dropbear list */ +#define DEFAULT_KEEPALIVE_LIMIT 3 + +/* 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" + +#endif /* DROPBEAR_DEFAULT_OPTIONS_H_ */ -- cgit v1.2.3