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localoptions.h
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#define DISABLE_LASTLOG
#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 "/data/dropbear/dropbear_dss_host_key"
#define RSA_PRIV_FILENAME "/data/dropbear/dropbear_rsa_host_key"
#define ECDSA_PRIV_FILENAME "/data/dropbear/dropbear_ecdsa_host_key"
/* 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 0
/* Enable X11 Forwarding - server only */
#define DROPBEAR_X11FWD 0
/* 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 <proxycommand> 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 "/data/dropbear/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 <privatekey>.
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 3
/* And then a global limit to avoid chewing memory if connections
* come from many IPs */
#define MAX_UNAUTH_CLIENTS 10
/* Maximum number of failed authentication tries (server option) */
#define MAX_AUTH_TRIES 5
/* 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 "/data/dropbear/dropbear.pid"
/* 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 "/data/dropbear/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 "/data/dropbear/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 "/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin:/data/dropbear"