CHANGELOG
=========
version 0.10.6 (released 2023-12-18)
* Fix CVE-2023-6004: Command injection using proxycommand
* Fix CVE-2023-48795: Potential downgrade attack using strict kex
* Fix CVE-2023-6918: Missing checks for return values of MD functions
* Fix ssh_send_issue_banner() for CMD(PowerShell)
* Avoid passing other events to callbacks when poll is called recursively (#202)
* Allow @ in usernames when parsing from URI composes
version 0.10.5 (released 2023-05-04)
* Fix CVE-2023-1667: a NULL dereference during rekeying with algorithm guessing
* Fix CVE-2023-2283: a possible authorization bypass in
pki_verify_data_signature under low-memory conditions.
* Fix several memory leaks in GSSAPI handling code
* Escape braces in ProxyCommand created from ProxyJump options for zsh
compatibility.
* Fix pkg-config path relocation for MinGW
* Improve doxygen documentation
* Fix build with cygwin due to the glob support
* Do not enqueue outgoing packets after sending SSH2_MSG_NEWKEYS
* Add support for SSH_SUPPRESS_DEPRECATED
* Avoid functions declarations without prototype to build with clang 15
* Fix spelling issues
* Avoid expanding KnownHosts, ProxyCommands and IdentityFiles repetitively
* Add support sk-* keys through configuration
* Improve checking for Argp library
* Log information about received extensions
* Correctly handle rekey with delayed compression
* Move the EC keys handling to OpenSSL 3.0 API
* Record peer disconnect message
* Avoid deadlock when write buffering occurs and we call poll recursively to
flush the output buffer
* Disable preauthentication compression by default
* Add CentOS 8 Stream / OpenSSL 1.1.1 to CI
* Add accidentally removed default compile flags
* Solve incorrect parsing of ProxyCommand option
version 0.10.4 (released 2022-09-07)
* Fixed issues with KDF on big endian
version 0.10.3 (released 2022-09-05)
* Fixed possible infinite loop in known hosts checking
version 0.10.2 (released 2022-09-02)
* Fixed tilde expansion when handling include directives
* Fixed building the shared torture library
* Made rekey test more robust (fixes running on i586 build systems e.g koji)
version 0.10.1 (released 2022-08-30)
* Fixed proxycommand support
* Fixed musl libc support
version 0.10.0 (released 2022-08-26)
* Added support for OpenSSL 3.0
* Added support for mbedTLS 3
* Added support for Smart Cards (through openssl pkcs11 engine)
* Added support for chacha20-poly1305@openssh.com with libgcrypt
* Added support ed25519 keys in PEM files
* Added support for sk-ecdsa and sk-ed25519 (server side)
* Added support for limiting RSA key sizes and not accepting small one by
default
* Added support for ssh-agent on Windows
* Added ssh_userauth_publickey_auto_get_current_identity() API
* Added ssh_vlog() API
* Added ssh_send_issue_banner() API
* Added ssh_session_set_disconnect_message() API
* Added new configuration options:
+ IdentityAgent
+ ModuliFile
* Provided X11 client example
* Disabled DSA support at build time by default (will be removed in the next
release)
* Deprecated the SCP API!
* Deprecated old pubkey, privatekey API
* Avoided some needless large stack buffers to minimize memory footprint
* Removed support for OpenSSL < 1.0.1
* Fixed parsing username@host in login name
* Free global init mutex in the destructor on Windows
* Fixed PEM parsing in mbedtls to support both legacy and new PKCS8 formats
version 0.9.6 (released 2021-08-26)
* CVE-2021-3634: Fix possible heap-buffer overflow when rekeying with
different key exchange mechanism
* Fix several memory leaks on error paths
* Reset pending_call_state on disconnect
* Fix handshake bug with AEAD ciphers and no HMAC overlap
* Use OPENSSL_CRYPTO_LIBRARIES in CMake
* Ignore request success and failure message if they are not expected
* Support more identity files in configuration
* Avoid setting compiler flags directly in CMake
* Support build directories with special characters
* Include stdlib.h to avoid crash in Windows
* Fix sftp_new_channel constructs an invalid object
* Fix Ninja multiple rules error
* Several tests fixes
version 0.9.5 (released 2020-09-10)
* CVE-2020-16135: Avoid null pointer dereference in sftpserver (T232)
* Improve handling of library initialization (T222)
* Fix parsing of subsecond times in SFTP (T219)
* Make the documentation reproducible
* Remove deprecated API usage in OpenSSL
* Fix regression of ssh_channel_poll_timeout() returning SSH_AGAIN
* Define version in one place (T226)
* Prevent invalid free when using different C runtimes than OpenSSL (T229)
* Compatibility improvements to testsuite
version 0.9.4 (released 2020-04-09)
* Fixed CVE-2020-1730 - Possible DoS in client and server when handling
AES-CTR keys with OpenSSL
* Added diffie-hellman-group14-sha256
* Fixed several possible memory leaks
version 0.9.3 (released 2019-12-10)
* Fixed CVE-2019-14889 - SCP: Unsanitized location leads to command execution
* SSH-01-003 Client: Missing NULL check leads to crash in erroneous state
* SSH-01-006 General: Various unchecked Null-derefs cause DOS
* SSH-01-007 PKI Gcrypt: Potential UAF/double free with RSA pubkeys
* SSH-01-010 SSH: Deprecated hash function in fingerprinting
* SSH-01-013 Conf-Parsing: Recursive wildcards in hostnames lead to DOS
* SSH-01-014 Conf-Parsing: Integer underflow leads to OOB array access
* SSH-01-001 State Machine: Initial machine states should be set explicitly
* SSH-01-002 Kex: Differently bound macros used to iterate same array
* SSH-01-005 Code-Quality: Integer sign confusion during assignments
* SSH-01-008 SCP: Protocol Injection via unescaped File Names
* SSH-01-009 SSH: Update documentation which RFCs are implemented
* SSH-01-012 PKI: Information leak via uninitialized stack buffer
version 0.9.2 (released 2019-11-07)
* Fixed libssh-config.cmake
* Fixed issues with rsa algorithm negotiation (T191)
* Fixed detection of OpenSSL ed25519 support (T197)
version 0.9.1 (released 2019-10-25)
* Added support for Ed25519 via OpenSSL
* Added support for X25519 via OpenSSL
* Added support for localuser in Match keyword
* Fixed Match keyword to be case sensitive
* Fixed compilation with LibreSSL
* Fixed error report of channel open (T75)
* Fixed sftp documentation (T137)
* Fixed known_hosts parsing (T156)
* Fixed build issue with MinGW (T157)
* Fixed build with gcc 9 (T164)
* Fixed deprecation issues (T165)
* Fixed known_hosts directory creation (T166)
version 0.9.0 (released 2019-02-xx)
* Added support for AES-GCM
* Added improved rekeying support
* Added performance improvements
* Disabled blowfish support by default
* Fixed several ssh config parsing issues
* Added support for DH Group Exchange KEX
* Added support for Encrypt-then-MAC mode
* Added support for parsing server side configuration file
* Added support for ECDSA/Ed25519 certificates
* Added FIPS 140-2 compatibility
* Improved known_hosts parsing
* Improved documentation
* Improved OpenSSL API usage for KEX, DH, and signatures
version 0.8.0 (released 2018-08-10)
* Removed support for deprecated SSHv1 protocol
* Added new connector API for clients
* Added new known_hosts parsing API
* Added support for OpenSSL 1.1
* Added support for chacha20-poly1305 cipher
* Added crypto backend for mbedtls crypto library
* Added ECDSA support with gcrypt backend
* Added advanced client and server testing using cwrap.org
* Added support for curve25519-sha256 alias
* Added support for global known_hosts file
* Added support for symbol versioning
* Improved ssh_config parsing
* Improved threading support
version 0.7.5 (released 2017-04-13)
* Fixed a memory allocation issue with buffers
* Fixed PKI on Windows
* Fixed some SSHv1 functions
* Fixed config hostname expansion
version 0.7.4 (released 2017-02-03)
* Added id_ed25519 to the default identity list
* Fixed sftp EOF packet handling
* Fixed ssh_send_banner() to confirm with RFC 4253
* Fixed some memory leaks
version 0.7.3 (released 2016-01-23)
* Fixed CVE-2016-0739
* Fixed ssh-agent on big endian
* Fixed some documentation issues
version 0.7.2 (released 2015-09-15)
* Fixed OpenSSL detection on Windows
* Fixed return status for ssh_userauth_agent()
* Fixed KEX to prefer hmac-sha2-256
* Fixed sftp packet handling
* Fixed return values of ssh_key_is_(public|private)
* Fixed bug in global success reply
version 0.7.1 (released 2015-06-30)
* Fixed SSH_AUTH_PARTIAL auth with auto public key
* Fixed memory leak in session options
* Fixed allocation of ed25519 public keys
* Fixed channel exit-status and exit-signal
* Reintroduce ssh_forward_listen()
version 0.7.0 (released 2015-05-11)
* Added support for ed25519 keys
* Added SHA2 algorithms for HMAC
* Added improved and more secure buffer handling code
* Added callback for auth_none_function
* Added support for ECDSA private key signing
* Added more tests
* Fixed a lot of bugs
* Improved API documentation
version 0.6.5 (released 2015-04-29)
* Fixed CVE-2015-3146
* Fixed port handling in config file
* Fixed the build with libgcrypt
* Fixed SFTP endian issues (rlo #179)
* Fixed uninitilized sig variable (rlo #167)
* Fixed polling issues which could result in a hang
* Fixed handling of EINTR in ssh_poll() (rlo #186)
* Fixed C99 issues with __func__
* Fixed some memory leaks
* Improved macro detection on Windows
version 0.6.4 (released 2014-12-19)
* Fixed CVE-2014-8132.
* Added SHA-2 for session ID signing with ECDSA keys.
* Added support for ECDSA host keys.
* Added support for more ECDSA hostkey algorithms.
* Added ssh_pki_key_ecdsa_name() API.
* Fixed setting the bindfd only after successful listen.
* Fixed issues with user created sockets.
* Fixed several issues in libssh C++ wrapper.
* Fixed several documentation issues.
* Fixed channel exit-signal request.
* Fixed X11 request screen number in messages.
* Fixed several memory leaks.
version 0.6.3 (released 2014-03-04)
* Fixed CVE-2014-0017.
* Fixed memory leak with ecdsa signatures.
version 0.6.2 (released 2014-03-04)
* security: fix for vulnerability CVE-2014-0017
version 0.6.1 (released 2014-02-08)
* Added support for libgcrypt 1.6.
* Added ssh_channel_accept_forward().
* Added known_hosts heuristic during connection (#138).
* Added getters for session cipher names.
* Fixed decrypt of zero length buffer.
* Fixed padding in RSA signature blobs.
* Fixed DSA signature extraction.
* Fixed some memory leaks.
* Fixed read of non-connected socket.
* Fixed thread detection.
version 0.6.0 (released 2014-01-08)
* Added new publicy key API.
* Added new userauth API.
* Added ssh_get_publickey_hash() function.
* Added ssh_get_poll_flags() function.
* Added gssapi-mic userauth.
* Added GSSAPIServerIdentity option.
* Added GSSAPIClientIdentity option.
* Added GSSAPIDelegateCredentials option.
* Added new callback based server API.
* Added Elliptic Curve DSA (ECDSA) support (with OpenSSL).
* Added Elliptic Curve Diffie Hellman (ECDH) support.
* Added Curve25519 for ECDH key exchange.
* Added improved logging system.
* Added SSH-agent forwarding.
* Added key-reexchange.
* Added more unit tests.
* Improved documentation.
* Fixed timeout handling.
version 0.5.5 (released 2013-07-26)
* BUG 103: Fix ProxyCommand parsing.
* Fix setting -D_FORTIFY_SOURCE=2.
* Fix pollset error return if empty.
* Fix NULL pointer checks in channel functions.
* Several bugfixes.
version 0.5.4 (released 2013-01-22)
* CVE-2013-0176 - NULL dereference leads to denial of service
* Fixed several NULL pointer dereferences in SSHv1.
* Fixed a free crash bug in options parsing.
version 0.5.3 (released 2012-11-20)
* CVE-2012-4559 Fixed multiple double free() flaws.
* CVE-2012-4560 Fixed multiple buffer overflow flaws.
* CVE-2012-4561 Fixed multiple invalid free() flaws.
* BUG #84 - Fix bug in sftp_mkdir not returning on error.
* BUG #85 - Fixed a possible channel infinite loop if the connection dropped.
* BUG #88 - Added missing channel request_state and set it to accepted.
* BUG #89 - Reset error state to no error on successful SSHv1 authentication.
* Fixed a possible use after free in ssh_free().
* Fixed multiple possible NULL pointer dereferences.
* Fixed multiple memory leaks in error paths.
* Fixed timeout handling.
* Fixed regression in pre-connected socket setting.
* Handle all unknown global messages.
version 0.5.2 (released 2011-09-17)
* Increased window size x10.
* Fixed SSHv1.
* Fixed bugged lists.
* Fixed use-after-free + inconsistent callbacks call in poll.
* Fixed scp documentation.
* Fixed possible infinite loop in channel_read().
* Fixed handling of short reads of sftp_async_read().
* Fixed handling request service timeout in blocking mode.
* Fixed ssh_auth_list() documentation.
* Fixed incorrect return values in ssh_channel_write().
* Fixed an infinite loop in the termination callback.
* Fixed handling of SSH_AGAIN in channel_open().
* Fixed "status -5 inflating zlib packet"
version 0.5.1 (released 2011-08-09)
* Added checks for NULL pointers in string.c.
* Set the channel max packet size to 32768.
* Don't (de)compress empty buffers.
* Fixed ssh_scp_write so it works when doing recursive copy.
* Fixed another source of endless wait.
* Fixed an endless loop in case of a channel_open error.
* Fixed session timeout handling.
* Fixed ssh_channel_from_local() loop.
* Fixed permissions of scp example when we copy a file.
* Workaround ssh_get_user_home_dir on LDAP users.
* Added pkg-config support for libssh_threads.
* Fixed compilation without server and sftp modes.
* Fix static .lib overwriting on Windows.
version 0.5.0 (released 2011-06-01)
* Added ssh_ prefix to all functions.
* Added complete Windows support.
* Added improved server support.
* Added unit tests for a lot of functions.
* Added asynchronous service request.
* Added a multiplatform ssh_getpass() function.
* Added a tutorial.
* Added a lot of documentation.
* Fixed a lot of bugs.
* Fixed several memory leaks.
version 0.4.8 (released 2011-01-15)
* Fixed memory leaks in session signing.
* Fixed memory leak in ssh_print_hexa.
* Fixed problem with ssh_connect w/ timeout and fd > 1024.
* Fixed some warnings on OS/2.
* Fixed installation path for OS/2.
version 0.4.7 (released 2010-12-28)
* Fixed a possible memory leak in ssh_get_user_home().
* Fixed a memory leak in sftp_xstat.
* Fixed uninitialized fd->revents member.
* Fixed timeout value in ssh_channel_accept().
* Fixed length checks in ssh_analyze_banner().
* Fixed a possible data overread and crash bug.
* Fixed setting max_fd which breaks ssh_select().
* Fixed some pedantic build warnings.
* Fixed a memory leak with session->bindaddr.
version 0.4.6 (released 2010-09-03)
* Added a cleanup function to free the ws2_32 library.
* Fixed build with gcc 3.4.
* Fixed the Windows build on Vista and newer.
* Fixed the usage of WSAPoll() on Windows.
* Fixed "@deprecated" in doxygen
* Fixed some mingw warnings.
* Fixed handling of opened channels.
* Fixed keepalive problem on older openssh servers.
* Fixed testing for big endian on Windows.
* Fixed the Windows preprocessor macros and defines.
version 0.4.5 (released 2010-07-13)
* Added option to bind a client to an ip address.
* Fixed the ssh socket polling function.
* Fixed Windows related bugs in bsd_poll().
* Fixed several build warnings.
version 0.4.4 (released 2010-06-01)
* Fixed a bug in the expand function for escape sequences.
* Fixed a bug in the tilde expand function.
* Fixed a bug in setting the options.
version 0.4.3 (released 2010-05-18)
* Added global/keepalive responses.
* Added runtime detection of WSAPoll().
* Added a select(2) based poll-emulation if poll(2) is not available.
* Added a function to expand an escaped string.
* Added a function to expand the tilde from a path.
* Added a proxycommand support.
* Added ssh_privatekey_type public function
* Added the possibility to define _OPENSSL_DIR and _ZLIB_DIR.
* Fixed sftp_chown.
* Fixed sftp_rename on protocol version 3.
* Fixed a blocking bug in channel_poll.
* Fixed config parsing which has overwritten user specified values.
* Fixed hashed [host]:port format in knownhosts
* Fixed Windows build.
* Fixed doublefree happening after a negotiation error.
* Fixed aes*-ctr with <= OpenSSL 0.9.7b.
* Fixed some documentation.
* Fixed exec example which has broken read usage.
* Fixed broken algorithm choice for server.
* Fixed a typo that we don't export all symbols.
* Removed the unneeded dependency to doxygen.
* Build examples only on the Linux platform.
version 0.4.2 (released 2010-03-15)
* Added owner and group information in sftp attributes.
* Added missing SSH_OPTIONS_FD option.
* Added printout of owner and group in the sftp example.
* Added a prepend function for ssh_list.
* Added send back replies to openssh's keepalives.
* Fixed documentation in scp code
* Fixed longname parsing, this only workings with readdir.
* Fixed and added support for several identity files.
* Fixed sftp_parse_longname() on Windows.
* Fixed a race condition bug in ssh_scp_close()
* Remove config support for SSHv1 Cipher variable.
* Rename ssh_list_add to ssh_list_append.
* Rename ssh_list_get_head to ssh_list_pop_head
version 0.4.1 (released 2010-02-13)
* Added support for aes128-ctr, aes192-ctr and aes256-ctr encryption.
* Added an example for exec.
* Added private key type detection feature in privatekey_from_file().
* Fixed zlib compression fallback.
* Fixed kex bug that client preference should be priority
* Fixed known_hosts file set by the user.
* Fixed a memleak in channel_accept().
* Fixed underflow when leave_function() are unbalanced
* Fixed memory corruption in handle_channel_request_open().
* Fixed closing of a file handle case of errors in privatekey_from_file().
* Fixed ssh_get_user_home_dir() to be thread safe.
* Fixed the doxygen documentation.
version 0.4.0 (released 2009-12-10)
* Added scp support.
* Added support for sending signals (RFC 4254, section 6.9).
* Added MSVC support.
* Added support for ~/.ssh/config.
* Added sftp extension support.
* Added X11 forwarding support for client.
* Added forward listening.
* Added support for openssh extensions (statvfs, fstatvfs).
* Added a cleaned up interface for setting options.
* Added a generic way to handle sockets asynchronously.
* Added logging of the sftp flags used to open a file.
* Added full poll() support and poll-emulation for win32.
* Added missing 64bit functions in sftp.
* Added support for ~/ and SSH_DIR/ in filenames instead of %s/.
* Fixed Fix channel_get_exit_status bug.
* Fixed calltrace logging to make it optional.
* Fixed compilation on Solaris.
* Fixed resolving of ip addresses.
* Fixed libssh compilation without server support.
* Fixed possible memory corruptions (ticket #14).
version 0.3.4 (released 2009-09-14)
* Added ssh_basename and ssh_dirname.
* Added a portable ssh_mkdir function.
* Added a sftp_tell64() function.
* Added missing NULL pointer checks to crypt_set_algorithms_server.
* Fixed ssh_write_knownhost if ~/.ssh doesn't exist.
* Fixed a possible integer overflow in buffer_get_data().
* Fixed possible security bug in packet_decrypt().
* Fixed a possible stack overflow in agent code.
version 0.3.3 (released 2009-08-18)
* Fixed double free pointer crash in dsa_public_to_string.
* Fixed channel_get_exit_status bug.
* Fixed ssh_finalize which didn't clear the flag.
* Fixed memory leak introduced by previous bugfix.
* Fixed channel_poll broken when delayed EOF recvd.
* Fixed stupid "can't parse known host key" bug.
* Fixed possible memory corruption (ticket #14).
version 0.3.2 (released 2009-08-05)
* Added ssh_init() function.
* Added sftp_readlink() function.
* Added sftp_symlink() function.
* Fixed ssh_write_knownhost().
* Fixed compilation on Solaris.
* Fixed SSHv1 compilation.
version 0.3.1 (released 2009-07-14)
* Added return code SSH_SERVER_FILE_NOT_FOUND.
* Fixed compilation of SSHv1.
* Fixed several memory leaks.
* Fixed possible infinite loops.
* Fixed a possible crash bug.
* Fixed build warnings.
* Fixed cmake on BSD.
version 0.3 (released 2009-05-21)
* Added support for ssh-agent authentication.
* Added POSIX like sftp implementation.
* Added error checking to all functions.
* Added const to arguments where it was needed.
* Added a channel_get_exit_status() function.
* Added a channel_read_buffer() function, channel_read() is now
a POSIX like function.
* Added a more generic auth callback function.
* Added printf attribute checking for log and error functions.
* Added runtime function tracer support.
* Added NSIS build support with CPack.
* Added openssh hashed host support.
* Added API documentation for all public functions.
* Added asynchronous SFTP read function.
* Added a ssh_bind_set_fd() function.
* Fixed known_hosts parsing.
* Fixed a lot of build warnings.
* Fixed the Windows build.
* Fixed a lot of memory leaks.
* Fixed a double free corruption in the server support.
* Fixed the "ssh_accept:" bug in server support.
* Fixed important channel bugs.
* Refactored the socket handling.
* Switched to CMake build system.
* Improved performance.
version 0.2 (released 2007-11-29)
* General cleanup
* More comprehensive API
* Up-to-date Doxygen documentation of each public function
* Basic server-based support
* Libgcrypt support (alternative to openssl and its license)
* SSH1 support (disabled by default)
* Added 3des-cbc
* A lot of bugfixes
version 0.11-dev
* Server implementation development.
* Small bug corrected when connecting to sun ssh servers.
* Channel weirdness corrected (writing huge data packets)
* Channel_read_nonblocking added
* Channel bug where stderr wasn't correctly read fixed.
* Added sftp_file_set_nonblocking(), which is nonblocking SFTP IO
* Connect_status callback.
* Priv.h contains the internal functions, libssh.h the public interface
* Options_set_timeout (thx marcelo) really working.
* Tcp tunneling through channel_open_forward.
* Channel_request_exec()
* Channel_request_env()
* Ssh_get_pubkey_hash()
* Ssh_is_server_known()
* Ssh_write_known_host()
* Options_set_ssh_dir
* How could this happen ! there weren't any channel_close !
* Nasty channel_free bug resolved.
* Removed the unsigned long all around the code. use only u8,u32 & u64.
* It now compiles and runs under amd64 !
* Channel_request_pty_size
* Channel_change_pty_size
* Options_copy()
* Ported the doc to an HTML file.
* Small bugfix in packet.c
* Prefixed error constants with SSH_
* Sftp_stat, sftp_lstat, sftp_fstat. thanks Michel Bardiaux for the patch.
* Again channel number mismatch fixed.
* Fixed a bug in ssh_select making the select fail when a signal has been
caught.
* Keyboard-interactive authentication working.
version 0.1 (released 2004-03-05)
* Beginning of sftp subsystem implementation.
* Some cleanup into channels implementation
* Now every channel functions is called by its CHANNEL handler.
* Added channel_poll() and channel_read().
* Changed the client so it uses the new channel_poll and channel_read interface
* Small use-after-free bug with channels resolved
* Changed stupidities in lot of function names.
* Removed a debug output file opened by default.
* Added API.txt, the libssh programmer handbook.
* Various bug fixes from Nick Zitzmann.
* Developed a cryptographic structure for handling protocols.
* An autoconf script which took me half of a day to set up.
* A ssh_select wrapper has been written.
version 0.0.4 (released 2003-10-10)
* Some terminal code (eof handling) added
* Channels bugfix (it still needs some tweaking though)
* Zlib support
* Added a wrapper.c file. The goal is to provide a similar API to every
cryptographic functions. bignums and sha/md5 are wrapped now.
* More work than it first looks.
* Support for other crypto libs planned (lighter libs)
* Fixed stupid select() bug.
* Libssh now compiles and links with openssl 0.9.6
* RSA pubkey authentication code now works !
version 0.0.3 (released 2003-09-15)
* Added install target in makefile
* Some cleanup in headers files and source code
* Change default banner and project name to libssh.
* New file auth.c to support more and more authentication ways
* Bugfix(read offbyone) in send_kex
* A base64 parser. don't read the source, it's awful. pure 0xbadc0de.
* Changed the client filename to "ssh". logic isn't it ?
* Dss publickey authentication ! still need to wait for the rsa one
* Bugfix in packet.c
* New misc.c contains misc functions
version 0.0.2 (released 2003-09-03)
* Initial release.
* Client supports both ssh and dss hostkey verification, but doesn't compare them to openssh's files. (~/.ssh/known_hosts)
* The only supported authentication method is password.
* Compiles on linux and openbsd. freebsd and netbsd should work, too
* Lot of work which hasn't been discussed here.
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