/* Include verbose debug output, enabled with -v at runtime (repeat to increase).
 * define which level of debug output you compile in
 * Level 0 = disabled
 * Level 1-3 = approx 4 Kb (connection, remote identity, algos, auth type info)
 * Level 4 = approx 17 Kb (detailed before connection)
 * Level 5 = approx 8 Kb (detailed after connection) */
#define DEBUG_TRACE 0

/* 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 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 0
#define DROPBEAR_CLI_REMOTETCPFWD 0

#define DROPBEAR_SVR_LOCALTCPFWD 0
#define DROPBEAR_SVR_REMOTETCPFWD 0
#define DROPBEAR_SVR_LOCALSTREAMFWD 0

/* Enable Authentication Agent Forwarding */
#define DROPBEAR_SVR_AGENTFWD 0
#define DROPBEAR_CLI_AGENTFWD 0

/* 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 0

/* Enable "Netcat mode" option. This will forward standard input/output
 * to a remote TCP-forwarded connection */
#define DROPBEAR_CLI_NETCAT 0

/* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
#define DROPBEAR_USER_ALGO_LIST 0

/* Encryption - at least one required.
 * AES128 should be enabled, some very old implementations might only
 * support 3DES.
 * Including both AES keysize variants (128 and 256) will result in
 * a minimal size increase */
#define DROPBEAR_AES128 1
#define DROPBEAR_AES256 1
#define DROPBEAR_3DES 0

/* Enable Chacha20-Poly1305 authenticated encryption mode. This is
 * generally faster than AES256 on CPU w/o dedicated AES instructions,
 * having the same key size. Recommended.
 * Compiling in will add ~5,5kB to binary size on x86-64 */
#define DROPBEAR_CHACHA20POLY1305 1

/* Enable "Counter Mode" for ciphers. Recommended. */
#define DROPBEAR_ENABLE_CTR_MODE 1

/* Enable CBC mode for ciphers. This has security issues though
   may be required for compatibility with old implementations */
#define DROPBEAR_ENABLE_CBC_MODE 0

/* Enable "Galois/Counter Mode" for ciphers. This authenticated
 * encryption mode is combination of CTR mode and GHASH. Recommended
 * for security and forwards compatibility, but slower than CTR on
 * CPU w/o dedicated AES/GHASH instructions.
 * Compiling in will add ~6kB to binary size on x86-64 */
#define DROPBEAR_ENABLE_GCM_MODE 1

/* Message integrity. sha2-256 is recommended as a default,
   sha1 for compatibility */
#define DROPBEAR_SHA1_HMAC 0
#define DROPBEAR_SHA2_256_HMAC 1
#define DROPBEAR_SHA2_512_HMAC 0
#define DROPBEAR_SHA1_96_HMAC 0

/* Hostkey/public key algorithms - at least one required, these are used
 * for hostkey as well as for verifying signatures with pubkey auth.
 * RSA is recommended.
 *
 * See: RSA_PRIV_FILENAME and DSS_PRIV_FILENAME */
#define DROPBEAR_RSA 1
/* Newer SSH implementations use SHA256 for RSA signatures. SHA1
 * support is required to communicate with some older implementations.
 * It will be removed in future due to SHA1 insecurity, it can be
 * disabled with DROPBEAR_RSA_SHA1 set to 0 */
#define DROPBEAR_RSA_SHA1 0

/* DSS may be necessary to connect to some systems but is not
 * recommended for new keys (1024 bits is small, and it uses SHA1).
 * RSA key generation will be faster with bundled libtommath
 * if DROPBEAR_DSS is disabled.
 * https://github.com/mkj/dropbear/issues/174#issuecomment-1267374858 */
#define DROPBEAR_DSS 0
/* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
 * code (either ECDSA or ECDH) increases binary size - around 30kB
 * on x86-64.
 * See: ECDSA_PRIV_FILENAME  */
#define DROPBEAR_ECDSA 1

/* Ed25519 is faster than ECDSA. Compiling in Ed25519 code increases
 * binary size - around 7,5kB on x86-64.
 * See: ED25519_PRIV_FILENAME  */
#define DROPBEAR_ED25519 1

/* Allow U2F security keys for public key auth, with
 * sk-ecdsa-sha2-nistp256@openssh.com or sk-ssh-ed25519@openssh.com keys.
 * The corresponding DROPBEAR_ECDSA or DROPBEAR_ED25519 also needs to be set.
 * This is currently server-only. */
#define DROPBEAR_SK_KEYS 1

/* RSA must be >=1024 */
#define DROPBEAR_DEFAULT_RSA_SIZE 2048
/* DSS is always 1024 */
/* ECDSA defaults to largest size configured, usually 521 */
/* Ed25519 is always 256 */

/* 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


/* Key exchange algorithm.

 * group14_sha1 - 2048 bit, sha1
 * group14_sha256 - 2048 bit, sha2-256
 * group16 - 4096 bit, sha2-512
 * group1 - 1024 bit, sha1
 * curve25519 - elliptic curve DH
 * ecdh - NIST elliptic curve DH (256, 384, 521)
 *
 * group1 is too small for security though is necessary if you need
     compatibility with some implementations such as Dropbear versions < 0.53
 * group14 is supported by most implementations.
 * group16 provides a greater strength level but is slower and increases binary size
 * curve25519 and ecdh algorithms are faster than non-elliptic curve methods
 * curve25519 increases binary size by ~2,5kB on x86-64
 * including either ECDH or ECDSA increases binary size by ~30kB on x86-64

 * Small systems should generally include either curve25519 or ecdh for performance.
 * curve25519 is less widely supported but is faster
 */
#define DROPBEAR_DH_GROUP14_SHA1 0
#define DROPBEAR_DH_GROUP14_SHA256 1
#define DROPBEAR_DH_GROUP16 0
#define DROPBEAR_CURVE25519 1
#define DROPBEAR_ECDH 1
#define DROPBEAR_DH_GROUP1 0

/* When group1 is enabled it will only be allowed by Dropbear client
not as a server, due to concerns over its strength. Set to 0 to allow
group1 in Dropbear server too */
#define DROPBEAR_DH_GROUP1_CLIENTONLY 1

/* 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
#define MOTD_FILENAME "/etc/motd"
#define MOTD_MAXSIZE 2000

/* Authentication Types - at least one required.
   RFC Draft requires pubkey auth, and recommends password */
#define DROPBEAR_SVR_PASSWORD_AUTH 1

/* 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 DROPBEAR_SVR_PAM_AUTH 0

/* ~/.ssh/authorized_keys authentication.
 * You must define DROPBEAR_SVR_PUBKEY_AUTH in order to use plugins. */
#define DROPBEAR_SVR_PUBKEY_AUTH 0

/* Whether to take public key options in
 * authorized_keys file into account */
#define DROPBEAR_SVR_PUBKEY_OPTIONS 0

/* Set this to 0 if your system does not have multiple user support.
   (Linux kernel CONFIG_MULTIUSER option)
   The resulting binary will not run on a normal system. */
#define DROPBEAR_SVR_MULTIUSER 1

/* Client authentication options */
#define DROPBEAR_CLI_PASSWORD_AUTH 1
#define DROPBEAR_CLI_PUBKEY_AUTH 0

/* A default argument for dbclient -i <privatekey>.
 * Homedir is prepended if path begins with ~/
 */
#define DROPBEAR_DEFAULT_CLI_AUTHKEY "~/.ssh/id_dropbear"

/* Per client configuration file
*/
#define DROPBEAR_USE_SSH_CONFIG 0

/* Allow specifying the password for dbclient via the DROPBEAR_PASSWORD
 * environment variable. */
#define DROPBEAR_USE_PASSWORD_ENV 1

/* 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. This is not yet enabled by default
 since it could cause problems with non-compliant servers */
#define DROPBEAR_CLI_IMMEDIATE_AUTH 0

/* Set this to use PRNGD or EGD instead of /dev/urandom */
#define DROPBEAR_USE_PRNGD 0
#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

/* Default maximum number of failed authentication tries (server option) */
/* -T server option overrides */
#define MAX_AUTH_TRIES 10

/* Delay introduced before closing an unauthenticated session (seconds).
   Disabled by default, can be set to say 30 seconds to reduce the speed
   of password brute forcing. Note that there is a risk of denial of
   service by setting this */
#define UNAUTH_CLOSE_DELAY 0

/* The default file to store the daemon's process ID, for shutdown
 * scripts etc. This can be overridden with the -P flag.
 * Homedir is prepended if path begins with ~/
 */
#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 and set DROPBEAR_SFTPSERVER.
 * The sftp-server program is not provided by Dropbear itself.
 * Homedir is prepended if path begins with ~/
 */
#define DROPBEAR_SFTPSERVER 0
#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"
#define DEFAULT_ROOT_PATH "/usr/sbin:/usr/bin:/sbin:/bin"