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author Matt Johnston <>
date Tue, 28 Jul 2020 18:53:48 +0800
parents d32bcb5c557d
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This file is out of date - it remains here in case it is still of use.
The basic naming convention is svr- and cli-  for seperate parts,
then common- for common parts. Some files have no prefix.

A brief rundown on which files do what, and their corresponding sections
in the IETF drafts. The .c files usually have corresponding .h files.

Transport layer  draft-ietf-secsh-transport-16.txt

session.c		Contains the main select() loop, and handles setting
			up/closing down ssh connections

algo.c			Framework for handling various ciphers/hashes/algos,
			and choosing between the lists of client/server
			preferred ones

kex.c			Key exchange routines, used at startup to negotiate
			which algorithms to use, and also to obtain session
			keys. This also runs when rekeying during the

packet.c		Handles the basic packet encryption/decryption,
			and switching to the appropriate packet handlers.
			Called from session.c's main select loop.

service.c		Handles service requests (userauth or connection)

Authentication  draft-ietf-secsh-userauth-17.txt

auth.c			General auth handling, including user checking etc,
			passes different auth types to auth{passwd,pubkey}

authpasswd.c		Handles /etc/passwd or /etc/shadow auth

authpubkey.c		Handles ~/.ssh/authorized_keys auth

Connection  draft-ietf-secsh-connect-17.txt

channel.c		Channel handling routines - each shell/tcp conn/agent
			etc is a channel.

chansession.c		Handles shell/exec requests

sshpty.c		From OpenSSH, allocates PTYs etc

termcodes.c		Mapping of POSIX terminal codes to SSH terminal codes

loginrec.c		From OpenSSH, handles utmp/wtmp logging

x11fwd.c		Handles X11 forwarding

agentfwd.c		Handles auth-agent forwarding requests

localtcpfwd.c		Handles -L style tcp forwarding requests, setting
			up the listening port and also handling connections
			to that port (and subsequent channels)


dbmulti.c		Combination binary chooser main() function

dbutil.c		Various utility functions, incl logging, memory etc

dropbearconvert.c	Conversion from dropbear<->openssh keys, uses
			keyimport.c to do most of the work

dropbearkey.c		Generates keys, calling gen{dss,rsa}

keyimport.c		Modified from PuTTY, converts between key types

main.c			dropbear's main(), handles listening, forking for
			new connections, child-process limits

runopts.c		Parses commandline options

options.h		Compile-time feature selection

config.h		Features selected from configure

debug.h			Compile-time selection of debug features

includes.h		Included system headers etc

Generic Routines

signkey.c		A generic handler for pubkeys, switches to dss or rsa
			depending on the key type

rsa.c			RSA asymmetric crypto routines

dss.c			DSS asymmetric crypto routines

ed25519.c		Ed25519 asymmetric crypto routines

gened25519.c		Ed25519 key generation

gendss.c		DSS key generation

genrsa.c		RSA key generation

bignum.c		Some bignum helper functions

queue.c			A queue, used to enqueue encrypted packets to send

random.c		PRNG, based on /dev/urandom or prngd

atomicio.c		From OpenSSH, does `blocking' IO on non-blocking fds

buffer.c		Buffer-usage routines, with size checking etc

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