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            to branch 'au.asn.ucc.matt.dropbear' (head ecd779509ef23a8cdf64888904fc9b31d78aa933)

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+/* Dropbear SSH
+ * Copyright (c) 2002,2003 Matt Johnston
+ * All rights reserved. See LICENSE for the license. */
+
+#ifndef _OPTIONS_H_
+#define _OPTIONS_H_
+
+/******************************************************************
+ * Define compile-time options below - the "#ifndef DROPBEAR_XXX .... #endif"
+ * parts are to allow for commandline -DDROPBEAR_XXX options etc.
+ ******************************************************************/
+
+#ifndef DROPBEAR_DEFPORT
+#define DROPBEAR_DEFPORT "22"
+#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
+
+/* 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
+#define INETD_MODE
+
+/* 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 (AES, DES
+etc) slower (perhaps by 50%). Recommended for most small systems. */
+#define DROPBEAR_SMALL_CODE
+
+/* Enable X11 Forwarding - server only */
+#define ENABLE_X11FWD
+
+/* Enable TCP Fowarding */
+/* 'Local' is "-L" style (client listening port forwarded via server)
+ * 'Remote' is "-R" style (server listening port forwarded via client) */
+
+#define ENABLE_CLI_LOCALTCPFWD
+#define ENABLE_CLI_REMOTETCPFWD
+
+#define ENABLE_SVR_LOCALTCPFWD
+#define ENABLE_SVR_REMOTETCPFWD
+
+/* Enable Authentication Agent Forwarding - server only for now */
+#define ENABLE_AGENTFWD
+
+/* Encryption - at least one required.
+ * RFC Draft 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_CBC
+#define DROPBEAR_3DES_CBC
+#define DROPBEAR_AES256_CBC
+#define DROPBEAR_BLOWFISH_CBC
+#define DROPBEAR_TWOFISH256_CBC
+#define DROPBEAR_TWOFISH128_CBC
+
+/* Message Integrity - at least one required.
+ * RFC Draft requires sha1 and recommends sha1-96.
+ * sha1-96 may be of use for slow links, as it has a smaller overhead.
+ *
+ * Note: there's no point disabling sha1 to save space, since it's used
+ * for the random number generator and public-key cryptography anyway.
+ * Disabling it here will just stop it from being used as the integrity portion
+ * of the ssh protocol.
+ *
+ * These hashes are also used for public key fingerprints in logs.
+ * If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
+ * which are not the standard form. */
+#define DROPBEAR_SHA1_HMAC
+#define DROPBEAR_SHA1_96_HMAC
+#define DROPBEAR_MD5_HMAC
+
+/* 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.
+ * SSH2 RFC Draft requires dss, recommends rsa */
+#define DROPBEAR_RSA
+#define DROPBEAR_DSS
+
+/* RSA can be vulnerable to timing attacks which use the time required for
+ * signing to guess the private key. Blinding avoids this attack, though makes
+ * signing operations slightly slower. */
+#define RSA_BLINDING
+
+/* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss,
+ * rather than just from the random byte source. Undefining this will save you
+ * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed
+ * if the random number source isn't good. In general this isn't required */
+/* #define DSS_PROTOK */
+
+/* Whether to do reverse DNS lookups. */
+#define DO_HOST_LOOKUP
+
+/* Whether to print the message of the day (MOTD). This doesn't add much code
+ * size */
+#define DO_MOTD
+
+/* 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 - don't bother using it otherwise.
+ * You can't enable both PASSWORD and PAM. */
+
+#define ENABLE_SVR_PASSWORD_AUTH
+/*#define ENABLE_SVR_PAM_AUTH */
+#define ENABLE_SVR_PUBKEY_AUTH
+
+#define ENABLE_CLI_PASSWORD_AUTH
+#define ENABLE_CLI_PUBKEY_AUTH
+#define ENABLE_CLI_INTERACT_AUTH
+
+/* Define this (as well as ENABLE_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 ENABLE_CLI_ASKPASS_HELPER*/
+
+/* Random device to use - define either DROPBEAR_RANDOM_DEV or
+ * DROPBEAR_PRNGD_SOCKET.
+ * DROPBEAR_RANDOM_DEV is recommended on hosts with a good /dev/(u)random,
+ * otherwise use run prngd (or egd if you want), specifying the socket. 
+ * The device will be queried for a few dozen bytes of seed a couple of times
+ * per session (or more for very long-lived sessions). */
+
+/* If you are lacking entropy on the system then using /dev/urandom
+ * will prevent Dropbear from blocking on the device. This could
+ * however significantly reduce the security of your ssh connections
+ * if the PRNG state becomes guessable - make sure you know what you are
+ * doing if you change this. */
+#define DROPBEAR_RANDOM_DEV "/dev/random"
+
+/* prngd must be manually set up to produce output */
+/*#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 file to store the daemon's process ID, for shutdown scripts etc */
+#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/X11R6/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 */
+#define _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 */
+
+/*******************************************************************
+ * You shouldn't edit below here unless you know you need to.
+ *******************************************************************/
+
+#ifndef DROPBEAR_VERSION
+#define DROPBEAR_VERSION "0.49"
+#endif
+
+#define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
+#define PROGNAME "dropbear"
+
+/* Spec recommends after one hour or 1 gigabyte of data. One hour
+ * is a bit too verbose, so we try 8 hours */
+#ifndef KEX_REKEY_TIMEOUT
+#define KEX_REKEY_TIMEOUT (3600 * 8)
+#endif
+#ifndef KEX_REKEY_DATA
+#define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */
+#endif
+/* Close connections to clients which haven't authorised after AUTH_TIMEOUT */
+#ifndef AUTH_TIMEOUT
+#define AUTH_TIMEOUT 300 /* we choose 5 minutes */
+#endif
+
+/* Minimum key sizes for DSS and RSA */
+#ifndef MIN_DSS_KEYLEN
+#define MIN_DSS_KEYLEN 512
+#endif
+#ifndef MIN_RSA_KEYLEN
+#define MIN_RSA_KEYLEN 512
+#endif
+
+#define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */
+#define MAX_BANNER_LINES 20 /* How many lines the client will display */
+
+/* the number of NAME=VALUE pairs to malloc for environ, if we don't have
+ * the clearenv() function */
+#define ENV_SIZE 100
+
+#define MAX_CMD_LEN 1024 /* max length of a command */
+#define MAX_TERM_LEN 200 /* max length of TERM name */
+
+#define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
+#define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
+
+#define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
+								 ipv4 and ipv6 don't count twice */
+
+/* Each port might have at least a v4 and a v6 address */
+#define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3)
+
+#define _PATH_TTY "/dev/tty"
+
+#define _PATH_CP "/bin/cp"
+
+/* Timeouts in seconds */
+#define SELECT_TIMEOUT 20
+
+/* success/failure defines */
+#define DROPBEAR_SUCCESS 0
+#define DROPBEAR_FAILURE -1
+
+/* various algorithm identifiers */
+#define DROPBEAR_KEX_DH_GROUP1 0
+
+#define DROPBEAR_SIGNKEY_ANY 0
+#define DROPBEAR_SIGNKEY_RSA 1
+#define DROPBEAR_SIGNKEY_DSS 2
+#define DROPBEAR_SIGNKEY_NONE 3
+
+#define DROPBEAR_COMP_NONE 0
+#define DROPBEAR_COMP_ZLIB 1
+
+/* Required for pubkey auth */
+#if defined(ENABLE_SVR_PUBKEY_AUTH) || defined(DROPBEAR_CLIENT)
+#define DROPBEAR_SIGNKEY_VERIFY
+#endif
+
+/* SHA1 is 20 bytes == 160 bits */
+#define SHA1_HASH_SIZE 20
+/* SHA512 is 64 bytes == 512 bits */
+#define SHA512_HASH_SIZE 64
+/* MD5 is 16 bytes = 128 bits */
+#define MD5_HASH_SIZE 16
+
+/* largest of MD5 and SHA1 */
+#define MAX_MAC_LEN SHA1_HASH_SIZE
+
+
+#define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
+#define MAX_IV_LEN 20 /* must be same as max blocksize, 
+						 and >= SHA1_HASH_SIZE */
+#define MAX_MAC_KEY 20
+
+#define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
+						   explicitly specified for all protocols (just
+						   for algos) but seems valid */
+
+#define MAX_PROPOSED_ALGO 20
+
+/* size/count limits */
+
+#define MAX_PACKET_LEN 35000
+#define MIN_PACKET_LEN 16
+#define MAX_PAYLOAD_LEN 32768
+
+#define MAX_TRANS_PAYLOAD_LEN 32768
+#define MAX_TRANS_PACKET_LEN (MAX_TRANS_PAYLOAD_LEN+50)
+
+#define MAX_TRANS_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
+#define MAX_TRANS_WIN_INCR 500000000 /* overflow prevention */
+
+#define MAX_STRING_LEN 1400 /* ~= MAX_PROPOSED_ALGO * MAX_NAME_LEN, also
+							   is the max length for a password etc */
+
+/* For a 4096 bit DSS key, empirically determined */
+#define MAX_PUBKEY_SIZE 1700
+/* For a 4096 bit DSS key, empirically determined */
+#define MAX_PRIVKEY_SIZE 1700
+
+/* The maximum size of the bignum portion of the kexhash buffer */
+/* Sect. 8 of the transport draft, K_S + e + f + K */
+#define KEXHASHBUF_MAX_INTS (1700 + 130 + 130 + 130)
+
+#define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit
+								in a few years time.... */
+
+#define DROPBEAR_MAX_CLI_PASS 1024
+
+#define DROPBEAR_MAX_CLI_INTERACT_PROMPTS 80 /* The number of prompts we'll 
+												accept for keyb-interactive
+												auth */
+
+#if defined(DROPBEAR_AES256_CBC) || defined(DROPBEAR_AES128_CBC)
+#define DROPBEAR_AES_CBC
+#endif
+
+#if defined(DROPBEAR_TWOFISH256_CBC) || defined(DROPBEAR_TWOFISH128_CBC)
+#define DROPBEAR_TWOFISH_CBC
+#endif
+
+#ifndef ENABLE_X11FWD
+#define DISABLE_X11FWD
+#endif
+
+#ifndef ENABLE_AGENTFWD
+#define DISABLE_AGENTFWD
+#endif
+
+#if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD)
+#define ENABLE_CLI_ANYTCPFWD 
+#endif
+
+#if defined(ENABLE_CLI_LOCALTCPFWD) || defined(ENABLE_SVR_REMOTETCPFWD)
+#define DROPBEAR_TCP_ACCEPT
+#endif
+
+#if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) || \
+	defined(ENABLE_SVR_REMOTETCPFWD) || defined(ENABLE_SVR_LOCALTCPFWD) || \
+	defined(ENABLE_AGENTFWD) || defined(ENABLE_X11FWD)
+#define USING_LISTENERS
+#endif
+
+#if defined(DROPBEAR_CLIENT) || defined(ENABLE_SVR_PUBKEY_AUTH)
+#define DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
+#endif
+
+#if defined(ENABLE_SVR_PASSWORD_AUTH) && defined(ENABLE_SVR_PAM_AUTH)
+#error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h"
+#endif
+
+#if defined(DROPBEAR_RANDOM_DEV) && defined(DROPBEAR_PRNGD_SOCKET)
+#error "You can't turn on DROPBEAR_PRNGD_SOCKET and DROPBEAR_RANDOM_DEV at once"
+#endif
+
+#if !defined(DROPBEAR_RANDOM_DEV) && !defined(DROPBEAR_PRNGD_SOCKET)
+#error "You must choose one of DROPBEAR_PRNGD_SOCKET or DROPBEAR_RANDOM_DEV in options.h"
+#endif
+
+/* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
+ * code, if we're just compiling as client or server */
+#if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
+
+#define IS_DROPBEAR_SERVER (ses.isserver == 1)
+#define IS_DROPBEAR_CLIENT (ses.isserver == 0)
+
+#elif defined(DROPBEAR_SERVER)
+
+#define IS_DROPBEAR_SERVER 1
+#define IS_DROPBEAR_CLIENT 0
+
+#elif defined(DROPBEAR_CLIENT)
+
+#define IS_DROPBEAR_SERVER 0
+#define IS_DROPBEAR_CLIENT 1
+
+#else
+#error You must compiled with either DROPBEAR_CLIENT or DROPBEAR_SERVER selected
+#endif
+
+#endif /* _OPTIONS_H_ */