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Diffstat (limited to 'default_options.h')
| -rw-r--r-- | default_options.h | 458 |
1 files changed, 458 insertions, 0 deletions
diff --git a/default_options.h b/default_options.h new file mode 100644 index 0000000..e59c338 --- /dev/null +++ b/default_options.h @@ -0,0 +1,458 @@ +#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 */ + +#ifndef DROPBEAR_DEFPORT +#define DROPBEAR_DEFPORT "22" +#endif + +/* Listen on all interfaces */ +#ifndef DROPBEAR_DEFADDRESS +#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 +#ifndef ECDSA_PRIV_FILENAME +#define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_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. */ +#ifndef NON_INETD_MODE +#define NON_INETD_MODE 1 +#endif +#ifndef INETD_MODE +#define INETD_MODE 1 +#endif + +/* 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. */ +#ifndef DROPBEAR_SMALL_CODE +#define DROPBEAR_SMALL_CODE 1 +#endif + +/* Enable X11 Forwarding - server only */ +#ifndef DROPBEAR_X11FWD +#define DROPBEAR_X11FWD 1 +#endif + +/* Enable TCP Fowarding */ +/* 'Local' is "-L" style (client listening port forwarded via server) + * 'Remote' is "-R" style (server listening port forwarded via client) */ + +#ifndef DROPBEAR_CLI_LOCALTCPFWD +#define DROPBEAR_CLI_LOCALTCPFWD 1 +#endif +#ifndef DROPBEAR_CLI_REMOTETCPFWD +#define DROPBEAR_CLI_REMOTETCPFWD 1 +#endif + +#ifndef DROPBEAR_SVR_LOCALTCPFWD +#define DROPBEAR_SVR_LOCALTCPFWD 1 +#endif +#ifndef DROPBEAR_SVR_REMOTETCPFWD +#define DROPBEAR_SVR_REMOTETCPFWD 1 +#endif + +/* Enable Authentication Agent Forwarding */ +#ifndef DROPBEAR_SVR_AGENTFWD +#define DROPBEAR_SVR_AGENTFWD 1 +#endif +#ifndef DROPBEAR_CLI_AGENTFWD +#define DROPBEAR_CLI_AGENTFWD 1 +#endif + + +/* Note: Both DROPBEAR_CLI_PROXYCMD and DROPBEAR_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 */ +#ifndef DROPBEAR_CLI_PROXYCMD +#define DROPBEAR_CLI_PROXYCMD 1 +#endif + +/* Enable "Netcat mode" option. This will forward standard input/output + * to a remote TCP-forwarded connection */ +#ifndef DROPBEAR_CLI_NETCAT +#define DROPBEAR_CLI_NETCAT 1 +#endif + +/* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */ +#ifndef ENABLE_USER_ALGO_LIST +#define ENABLE_USER_ALGO_LIST 1 +#endif + +/* 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.*/ +#ifndef DROPBEAR_AES128 +#define DROPBEAR_AES128 1 +#endif +#ifndef DROPBEAR_3DES +#define DROPBEAR_3DES 1 +#endif +#ifndef DROPBEAR_AES256 +#define DROPBEAR_AES256 1 +#endif +/* Compiling in Blowfish will add ~6kB to runtime heap memory usage */ +/*#define DROPBEAR_BLOWFISH*/ +#ifndef DROPBEAR_TWOFISH256 +#define DROPBEAR_TWOFISH256 1 +#endif +#ifndef DROPBEAR_TWOFISH128 +#define DROPBEAR_TWOFISH128 1 +#endif + +/* Enable CBC mode for ciphers. This has security issues though + * is the most compatible with older SSH implementations */ +#ifndef DROPBEAR_ENABLE_CBC_MODE +#define DROPBEAR_ENABLE_CBC_MODE 1 +#endif + +/* Enable "Counter Mode" for ciphers. This is more secure than normal + * CBC mode against certain attacks. It is recommended for security + * and forwards compatibility */ +#ifndef DROPBEAR_ENABLE_CTR_MODE +#define DROPBEAR_ENABLE_CTR_MODE 1 +#endif + +/* 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 */ +#ifndef DROPBEAR_TWOFISH_CTR +#define DROPBEAR_TWOFISH_CTR 0 +#endif + +/* Message integrity. sha2-256 is recommended as a default, + sha1 for compatibility */ +#ifndef DROPBEAR_SHA1_HMAC +#define DROPBEAR_SHA1_HMAC 1 +#endif +#ifndef DROPBEAR_SHA1_96_HMAC +#define DROPBEAR_SHA1_96_HMAC 1 +#endif +#ifndef DROPBEAR_SHA2_256_HMAC +#define DROPBEAR_SHA2_256_HMAC 1 +#endif +/* Default is to include it is sha512 is being compiled in for ECDSA */ +#ifndef DROPBEAR_SHA2_512_HMAC +#define DROPBEAR_SHA2_512_HMAC (DROPBEAR_ECDSA) +#endif + +/* XXX needed for fingerprints */ +#ifndef DROPBEAR_MD5_HMAC +#define DROPBEAR_MD5_HMAC 0 +#endif + +/* 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 */ +#ifndef DROPBEAR_RSA +#define DROPBEAR_RSA 1 +#endif +#ifndef DROPBEAR_DSS +#define DROPBEAR_DSS 1 +#endif +/* ECDSA is significantly faster than RSA or DSS. Compiling in ECC + * code (either ECDSA or ECDH) increases binary size - around 30kB + * on x86-64 */ +#ifndef DROPBEAR_ECDSA +#define DROPBEAR_ECDSA 1 +#endif + +/* 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. */ +#ifndef DROPBEAR_DELAY_HOSTKEY +#define DROPBEAR_DELAY_HOSTKEY 1 +#endif + +/* Enable Curve25519 for key exchange. This is another elliptic + * curve method with good security properties. Increases binary size + * by ~8kB on x86-64 */ +#ifndef DROPBEAR_CURVE25519 +#define DROPBEAR_CURVE25519 1 +#endif + +/* Enable elliptic curve Diffie Hellman key exchange, see note about + * ECDSA above */ +#ifndef DROPBEAR_ECDH +#define DROPBEAR_ECDH 1 +#endif + +/* 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 + */ +#ifndef DROPBEAR_DH_GROUP1 +#define DROPBEAR_DH_GROUP1 1 +#endif +#ifndef DROPBEAR_DH_GROUP14_SHA1 +#define DROPBEAR_DH_GROUP14_SHA1 1 +#endif +#ifndef DROPBEAR_DH_GROUP14_SHA256 +#define DROPBEAR_DH_GROUP14_SHA256 1 +#endif +#ifndef DROPBEAR_DH_GROUP16 +#define DROPBEAR_DH_GROUP16 0 +#endif + +/* 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. */ +#ifndef DO_HOST_LOOKUP +#define DO_HOST_LOOKUP 0 +#endif + +/* Whether to print the message of the day (MOTD). */ +#ifndef DO_MOTD +#define DO_MOTD 0 +#endif + +/* 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. */ + +/* This requires crypt() */ +#ifdef HAVE_CRYPT +#ifndef DROPBEAR_SVR_PASSWORD_AUTH +#define DROPBEAR_SVR_PASSWORD_AUTH 1 +#endif +#else +#ifndef DROPBEAR_SVR_PASSWORD_AUTH +#define DROPBEAR_SVR_PASSWORD_AUTH 0 +#endif +#endif +/* PAM requires ./configure --enable-pam */ +#ifndef DROPBEAR_SVR_PAM_AUTH +#define DROPBEAR_SVR_PAM_AUTH 0 +#endif +#ifndef DROPBEAR_SVR_PUBKEY_AUTH +#define DROPBEAR_SVR_PUBKEY_AUTH 1 +#endif + +/* Whether to take public key options in + * authorized_keys file into account */ +#ifndef DROPBEAR_SVR_PUBKEY_OPTIONS +#define DROPBEAR_SVR_PUBKEY_OPTIONS 1 +#endif + +/* This requires getpass. */ +#ifdef HAVE_GETPASS +#ifndef DROPBEAR_CLI_PASSWORD_AUTH +#define DROPBEAR_CLI_PASSWORD_AUTH 1 +#endif +#ifndef DROPBEAR_CLI_INTERACT_AUTH +#define DROPBEAR_CLI_INTERACT_AUTH 1 +#endif +#endif +#ifndef DROPBEAR_CLI_PUBKEY_AUTH +#define DROPBEAR_CLI_PUBKEY_AUTH 1 +#endif + +/* A default argument for dbclient -i <privatekey>. +Homedir is prepended unless path begins with / */ +#ifndef DROPBEAR_DEFAULT_CLI_AUTHKEY +#define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear" +#endif + +/* 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.*/ +#ifndef DROPBEAR_PASSWORD_ENV +#define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD" +#endif + +/* 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 */ +#ifndef DROPBEAR_CLI_ASKPASS_HELPER +#define DROPBEAR_CLI_ASKPASS_HELPER 0 +#endif + +/* 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 */ +#ifndef DROPBEAR_CLI_IMMEDIATE_AUTH +#define DROPBEAR_CLI_IMMEDIATE_AUTH 0 +#endif + +/* 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 */ +#ifndef DROPBEAR_URANDOM_DEV +#define DROPBEAR_URANDOM_DEV "/dev/urandom" +#endif + +/* 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/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 */ +#ifndef DROPBEAR_PATH_SSH_PROGRAM +#define DROPBEAR_PATH_SSH_PROGRAM "/usr/bin/dbclient" +#endif + +/* 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. */ +#ifndef LOG_COMMANDS +#define LOG_COMMANDS 0 +#endif + +/* 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 */ +#ifndef DEFAULT_KEEPALIVE +#define DEFAULT_KEEPALIVE 0 +#endif + +/* 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 */ +#ifndef DEFAULT_KEEPALIVE_LIMIT +#define DEFAULT_KEEPALIVE_LIMIT 3 +#endif + +/* Ensure that data is received within IDLE_TIMEOUT seconds. This can +be overridden at runtime with -I. 0 disables idle timeouts */ +#ifndef DEFAULT_IDLE_TIMEOUT +#define DEFAULT_IDLE_TIMEOUT 0 +#endif + +/* The default path. This will often get replaced by the shell */ +#ifndef DEFAULT_PATH +#define DEFAULT_PATH "/usr/bin:/bin" +#endif + +#endif /* DROPBEAR_DEFAULT_OPTIONS_H_ */ |