dropbear: sysoptions.h annotate

annotate sysoptions.h @ 929:9d40ed1da686

Experiment of always writing data if available. Might waste a writev() with EAGAIN but always saves a select() - needs testing with bandwidth-limited and CPU-limited situations.

author	Matt Johnston <matt@ucc.asn.au>
date	Sat, 15 Mar 2014 11:37:02 +0800
parents	2351b2da8e0d
children	bae0b34bc059 d93a6bcf616f

rev	line source
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 /*******************************************************************
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 * You shouldn't edit this file unless you know you need to.
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 * This file is only included from options.h
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 *******************************************************************/
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 #ifndef DROPBEAR_VERSION
902 2351b2da8e0d 2014.63 Matt Johnston <matt@ucc.asn.au> parents: 900 diff changeset	7 #define DROPBEAR_VERSION "2014.63"
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 #define PROGNAME "dropbear"
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 /* Spec recommends after one hour or 1 gigabyte of data. One hour
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 * is a bit too verbose, so we try 8 hours */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 #ifndef KEX_REKEY_TIMEOUT
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 #define KEX_REKEY_TIMEOUT (3600 * 8)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 #ifndef KEX_REKEY_DATA
887 0459ff21e320 Back out accidentally committed files Matt Johnston <matt@ucc.asn.au> parents: 886 diff changeset	19 #define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 /* Close connections to clients which haven't authorised after AUTH_TIMEOUT */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 #ifndef AUTH_TIMEOUT
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25
746 465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	26 /* A client should try and send an initial key exchange packet guessing
465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	27 * the algorithm that will match - saves a round trip connecting, has little
465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	28 * overhead if the guess was "wrong". */
465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	29 #define USE_KEX_FIRST_FOLLOWS
465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	30 /* Use protocol extension to allow "first follows" to succeed more frequently.
465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	31 * This is currently Dropbear-specific but will gracefully fallback when connecting
465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	32 * to other implementations. */
465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	33 #define USE_KEXGUESS2
465fefc4f6e0 Put some #ifdef options around first-follows options in case they Matt Johnston <matt@ucc.asn.au> parents: 745 diff changeset	34
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 /* Minimum key sizes for DSS and RSA */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 #ifndef MIN_DSS_KEYLEN
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 #define MIN_DSS_KEYLEN 512
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39 #ifndef MIN_RSA_KEYLEN
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 #define MIN_RSA_KEYLEN 512
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 #define MAX_BANNER_SIZE 2000 /* this is 2580 chars, any more is foolish /
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 * the clearenv() function */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 #define ENV_SIZE 100
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 #define MAX_CMD_LEN 1024 /* max length of a command */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 #define MAX_TERM_LEN 200 /* max length of TERM name */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 ipv4 and ipv6 don't count twice */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 /* Each port might have at least a v4 and a v6 address */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 #define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 #define _PATH_TTY "/dev/tty"
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 #define _PATH_CP "/bin/cp"
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65
722 4a274f47eabd Add ~. and ~^Z handling to exit/suspend dbclient Matt Johnston <matt@ucc.asn.au> parents: 718 diff changeset	66 #define DROPBEAR_ESCAPE_CHAR '~'
4a274f47eabd Add ~. and ~^Z handling to exit/suspend dbclient Matt Johnston <matt@ucc.asn.au> parents: 718 diff changeset	67
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	68 /* success/failure defines */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 #define DROPBEAR_SUCCESS 0
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	70 #define DROPBEAR_FAILURE -1
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 /* Required for pubkey auth */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 #if defined(ENABLE_SVR_PUBKEY_AUTH) \|\| defined(DROPBEAR_CLIENT)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 #define DROPBEAR_SIGNKEY_VERIFY
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 #define SHA1_HASH_SIZE 20
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78 #define MD5_HASH_SIZE 16
855 04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G. Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	79 #define MAX_HASH_SIZE 64 /* sha512 */
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
762 a78a38e402d1 - Fix various hardcoded uses of SHA1 Matt Johnston <matt@ucc.asn.au> parents: 761 diff changeset	82 #define MAX_IV_LEN 20 /* must be same as max blocksize, */
715 cd3d3c63d189 Make hmac-sha2-256 and hmac-sha2-512 work Matt Johnston <matt@ucc.asn.au> parents: 710 diff changeset	83
679 03073a27abb3 - Add hmac-sha2-256 and hmac-sha2-512. Needs debugging, seems to be Matt Johnston <matt@ucc.asn.au> parents: 668 diff changeset	84 #if defined(DROPBEAR_SHA2_512_HMAC)
715 cd3d3c63d189 Make hmac-sha2-256 and hmac-sha2-512 work Matt Johnston <matt@ucc.asn.au> parents: 710 diff changeset	85 #define MAX_MAC_LEN 64
679 03073a27abb3 - Add hmac-sha2-256 and hmac-sha2-512. Needs debugging, seems to be Matt Johnston <matt@ucc.asn.au> parents: 668 diff changeset	86 #elif defined(DROPBEAR_SHA2_256_HMAC)
715 cd3d3c63d189 Make hmac-sha2-256 and hmac-sha2-512 work Matt Johnston <matt@ucc.asn.au> parents: 710 diff changeset	87 #define MAX_MAC_LEN 32
679 03073a27abb3 - Add hmac-sha2-256 and hmac-sha2-512. Needs debugging, seems to be Matt Johnston <matt@ucc.asn.au> parents: 668 diff changeset	88 #else
715 cd3d3c63d189 Make hmac-sha2-256 and hmac-sha2-512 work Matt Johnston <matt@ucc.asn.au> parents: 710 diff changeset	89 #define MAX_MAC_LEN 20
679 03073a27abb3 - Add hmac-sha2-256 and hmac-sha2-512. Needs debugging, seems to be Matt Johnston <matt@ucc.asn.au> parents: 668 diff changeset	90 #endif
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 722 diff changeset	92 #if defined(DROPBEAR_ECDH) \|\| defined (DROPBEAR_ECDSA)
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 722 diff changeset	93 #define DROPBEAR_ECC
838 4365e12c68e6 A few small fixes for ECC compilation Matt Johnston <matt@ucc.asn.au> parents: 835 diff changeset	94 /* Debian doesn't define this in system headers */
869 c63e7644db60 Only define LTM_DESC if it isn't already Matt Johnston <matt@ucc.asn.au> parents: 861 diff changeset	95 #ifndef LTM_DESC
838 4365e12c68e6 A few small fixes for ECC compilation Matt Johnston <matt@ucc.asn.au> parents: 835 diff changeset	96 #define LTM_DESC
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 722 diff changeset	97 #endif
869 c63e7644db60 Only define LTM_DESC if it isn't already Matt Johnston <matt@ucc.asn.au> parents: 861 diff changeset	98 #endif
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 722 diff changeset	99
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	100 #ifdef DROPBEAR_ECC
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	101 #define DROPBEAR_ECC_256
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	102 #define DROPBEAR_ECC_384
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	103 #define DROPBEAR_ECC_521
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	104 #endif
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	105
761 ac2158e3e403 ecc kind of works, needs fixing/testing Matt Johnston <matt@ucc.asn.au> parents: 759 diff changeset	106 #ifdef DROPBEAR_ECC
ac2158e3e403 ecc kind of works, needs fixing/testing Matt Johnston <matt@ucc.asn.au> parents: 759 diff changeset	107 #define DROPBEAR_LTC_PRNG
ac2158e3e403 ecc kind of works, needs fixing/testing Matt Johnston <matt@ucc.asn.au> parents: 759 diff changeset	108 #endif
ac2158e3e403 ecc kind of works, needs fixing/testing Matt Johnston <matt@ucc.asn.au> parents: 759 diff changeset	109
850 7507b174bba0 - Make curve25519 work after fixing a typo, interoperates with OpenSSH Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	110 /* RSA can be vulnerable to timing attacks which use the time required for
7507b174bba0 - Make curve25519 work after fixing a typo, interoperates with OpenSSH Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	111 * signing to guess the private key. Blinding avoids this attack, though makes
7507b174bba0 - Make curve25519 work after fixing a typo, interoperates with OpenSSH Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	112 * signing operations slightly slower. */
7507b174bba0 - Make curve25519 work after fixing a typo, interoperates with OpenSSH Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	113 #define RSA_BLINDING
7507b174bba0 - Make curve25519 work after fixing a typo, interoperates with OpenSSH Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	114
847 f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 838 diff changeset	115 /* hashes which will be linked and registered */
850 7507b174bba0 - Make curve25519 work after fixing a typo, interoperates with OpenSSH Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	116 #if defined(DROPBEAR_SHA2_256_HMAC) \|\| defined(DROPBEAR_ECC_256) \|\| defined(DROPBEAR_CURVE25519)
759 76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	117 #define DROPBEAR_SHA256
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	118 #endif
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	119 #if defined(DROPBEAR_ECC_384)
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	120 #define DROPBEAR_SHA384
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	121 #endif
847 f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 838 diff changeset	122 /* LTC SHA384 depends on SHA512 */
f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 838 diff changeset	123 #if defined(DROPBEAR_SHA2_512_HMAC) \|\| defined(DROPBEAR_ECC_521) \|\| defined(DROPBEAR_ECC_384)
759 76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	124 #define DROPBEAR_SHA512
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	125 #endif
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	126 #if defined(DROPBEAR_MD5_HMAC)
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	127 #define DROPBEAR_MD5
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	128 #endif
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	129
847 f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 838 diff changeset	130 /* roughly 2x 521 bits */
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 722 diff changeset	131 #define MAX_ECC_SIZE 140
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 722 diff changeset	132
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	134 explicitly specified for all protocols (just
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	135 for algos) but seems valid */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	136
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	137 #define MAX_PROPOSED_ALGO 20
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	138
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	139 /* size/count limits */
603 3aa74a4d83ae Refer to RFCs rather than drafts, update some section references Matt Johnston <matt@ucc.asn.au> parents: 598 diff changeset	140 /* From transport rfc */
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	141 #define MIN_PACKET_LEN 16
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143 #define RECV_MAX_PACKET_LEN (MAX(35000, ((RECV_MAX_PAYLOAD_LEN)+100)))
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	144
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 /* for channel code */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146 #define TRANS_MAX_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147 #define TRANS_MAX_WIN_INCR 500000000 /* overflow prevention */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	148
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	149 #define RECV_WINDOWEXTEND (opts.recv_window / 3) /* We send a "window extend" every
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	150 RECV_WINDOWEXTEND bytes */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	151 #define MAX_RECV_WINDOW (10241024) / 1 MB should be enough */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	152
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	153 #define MAX_CHANNELS 100 /* simple mem restriction, includes each tcp/x11
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	154 connection, so can't be _too_ small */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	155
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	156 #define MAX_STRING_LEN 1400 /* ~= MAX_PROPOSED_ALGO * MAX_NAME_LEN, also
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	157 is the max length for a password etc */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	158
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159 /* For a 4096 bit DSS key, empirically determined */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160 #define MAX_PUBKEY_SIZE 1700
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	161 /* For a 4096 bit DSS key, empirically determined */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162 #define MAX_PRIVKEY_SIZE 1700
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163
795 7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	164 #define MAX_HOSTKEYS 3
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	165
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166 /* The maximum size of the bignum portion of the kexhash buffer */
603 3aa74a4d83ae Refer to RFCs rather than drafts, update some section references Matt Johnston <matt@ucc.asn.au> parents: 598 diff changeset	167 /* Sect. 8 of the transport rfc 4253, K_S + e + f + K */
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168 #define KEXHASHBUF_MAX_INTS (1700 + 130 + 130 + 130)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	169
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	170 #define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	171 in a few years time.... */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	172
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	173 #define DROPBEAR_MAX_CLI_PASS 1024
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	174
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175 #define DROPBEAR_MAX_CLI_INTERACT_PROMPTS 80 /* The number of prompts we'll
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	176 accept for keyb-interactive
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	177 auth */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178
883 ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default Matt Johnston <matt@ucc.asn.au> parents: 878 diff changeset	179
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	180 #if defined(DROPBEAR_AES256) \|\| defined(DROPBEAR_AES128)
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	181 #define DROPBEAR_AES
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	182 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	184 #if defined(DROPBEAR_TWOFISH256) \|\| defined(DROPBEAR_TWOFISH128)
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	185 #define DROPBEAR_TWOFISH
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	186 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	187
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	188 #ifndef ENABLE_X11FWD
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	189 #define DISABLE_X11FWD
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	190 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	191
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	192 #if defined(ENABLE_CLI_REMOTETCPFWD) \|\| defined(ENABLE_CLI_LOCALTCPFWD)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	193 #define ENABLE_CLI_ANYTCPFWD
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	195
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	196 #if defined(ENABLE_CLI_LOCALTCPFWD) \|\| defined(ENABLE_SVR_REMOTETCPFWD)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197 #define DROPBEAR_TCP_ACCEPT
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	198 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	199
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	200 #if defined(ENABLE_CLI_REMOTETCPFWD) \|\| defined(ENABLE_CLI_LOCALTCPFWD) \|\| \
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	201 defined(ENABLE_SVR_REMOTETCPFWD) \|\| defined(ENABLE_SVR_LOCALTCPFWD) \|\| \
547 cf376c696dfc Make it compile, update for changes in channel structure. Matt Johnston <matt@ucc.asn.au> parents: 521 diff changeset	202 defined(ENABLE_SVR_AGENTFWD) \|\| defined(ENABLE_X11FWD)
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	203 #define USING_LISTENERS
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	204 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	205
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	206 #if defined(ENABLE_CLI_NETCAT) && defined(ENABLE_CLI_PROXYCMD)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	207 #define ENABLE_CLI_MULTIHOP
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	208 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	209
547 cf376c696dfc Make it compile, update for changes in channel structure. Matt Johnston <matt@ucc.asn.au> parents: 521 diff changeset	210 #if defined(ENABLE_CLI_AGENTFWD) \|\| defined(DROPBEAR_PRNGD_SOCKET)
cf376c696dfc Make it compile, update for changes in channel structure. Matt Johnston <matt@ucc.asn.au> parents: 521 diff changeset	211 #define ENABLE_CONNECT_UNIX
cf376c696dfc Make it compile, update for changes in channel structure. Matt Johnston <matt@ucc.asn.au> parents: 521 diff changeset	212 #endif
cf376c696dfc Make it compile, update for changes in channel structure. Matt Johnston <matt@ucc.asn.au> parents: 521 diff changeset	213
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214 #if defined(DROPBEAR_CLIENT) \|\| defined(ENABLE_SVR_PUBKEY_AUTH)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	215 #define DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	216 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	217
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 598 diff changeset	218 /* Changing this is inadvisable, it appears to have problems
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 598 diff changeset	219 * with flushing compressed data */
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 598 diff changeset	220 #define DROPBEAR_ZLIB_MEM_LEVEL 8
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 598 diff changeset	221
499 f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	222 #if defined(ENABLE_SVR_PASSWORD_AUTH) && defined(ENABLE_SVR_PAM_AUTH)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	223 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h"
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	224 #endif
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	225
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	226 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	227 * code, if we're just compiling as client or server */
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	228 #if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	229
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	230 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	231 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	232
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	233 #elif defined(DROPBEAR_SERVER)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235 #define IS_DROPBEAR_SERVER 1
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236 #define IS_DROPBEAR_CLIENT 0
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238 #elif defined(DROPBEAR_CLIENT)
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 #define IS_DROPBEAR_SERVER 0
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241 #define IS_DROPBEAR_CLIENT 1
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually Matt Johnston <matt@ucc.asn.au> parents: diff changeset	243 #else
521 cc2dff9bd671 - Allow building with neither server nor client specified Matt Johnston <matt@ucc.asn.au> parents: 516 diff changeset	244 /* Just building key utils? */
cc2dff9bd671 - Allow building with neither server nor client specified Matt Johnston <matt@ucc.asn.au> parents: 516 diff changeset	245 #define IS_DROPBEAR_SERVER 0
cc2dff9bd671 - Allow building with neither server nor client specified Matt Johnston <matt@ucc.asn.au> parents: 516 diff changeset	246 #define IS_DROPBEAR_CLIENT 0
cc2dff9bd671 - Allow building with neither server nor client specified Matt Johnston <matt@ucc.asn.au> parents: 516 diff changeset	247
667 fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK Matt Johnston <matt@ucc.asn.au> parents: 661 diff changeset	248 #endif /* neither DROPBEAR_SERVER nor DROPBEAR_CLIENT */
fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK Matt Johnston <matt@ucc.asn.au> parents: 661 diff changeset	249
fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK Matt Johnston <matt@ucc.asn.au> parents: 661 diff changeset	250 #ifndef HAVE_FORK
fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK Matt Johnston <matt@ucc.asn.au> parents: 661 diff changeset	251 #define USE_VFORK
fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK Matt Johnston <matt@ucc.asn.au> parents: 661 diff changeset	252 #endif /* don't HAVE_FORK */
fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK Matt Johnston <matt@ucc.asn.au> parents: 661 diff changeset	253
fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK Matt Johnston <matt@ucc.asn.au> parents: 661 diff changeset	254 /* no include guard for this file */

Mercurial > dropbear

annotate sysoptions.h @ 929:9d40ed1da686