Below you will find the wolfSSH ChangeLog documenting the changes that took place with each release of wolfSSH since the project’s beginning in 2016.

wolfSSH 1.4.8


  • New Feature Additions and Improvements
    • Add remote port forwarding
    • Make loading user created keys into the examples easier
    • Add --with-wolfssl and use --prefix to look for wolfSSL
    • Updated the unsupported GlobalReq response
  • Fixes
    • Fix for RSA public key auth
    • When decoding SFTP messages, fix the size checks so they don't wrap
    • Fix an issue where the testsuite and echoserver a socket failure
    • SFTP fix for getting attribute header
    • Fix for possible null dereference in SendKexDhReply
    • Remove reference to udp from test.h
    • Fixes to local port forwarding

wolfSSH 1.4.7


  • New Feature Additions and Improvements
    • SCP improvements to run on embedded RTOS
    • For SFTP messages, check both minimum bound and maximum bound of the length value
    • Added option for --enable-small-stack
    • Added SFTP support for FatFs
    • Added 192 and 256 bit support for AES-CBC, AES-CTR, and AES-GCM
    • Added options to disable algorithms. (ie WOLFSSH_NO_ECDSA, WOLFSSH_NO_AES_CBC, etc)
    • Improved handling of builds without ECC
  • Fixes
    • When processing public key user auth, initialize the key earlier
    • When processing public key user auth, use GetSize() instead of GetUint32()
    • Fix for better handling rekey
    • Fix for build with NO_WOLFSSH_CLIENT macro and --enable-all
    • Fix configuration with WOLFSSH_NO_DH
    • To add internal function to purge a packet in case building one fails
    • Fix for cleanup in error case with SFTP read packet
    • Fix initialization of DH Size values

wolfSSH 1.4.6


  • New Feature Additions
    • Added optional builds for not using RSA or ECC making the build more modular for resource constrained situations.
    • MQX IDE build added
    • Command line option added for Agent use with the example client
  • Fixes
    • Increase the ID list size for interop with some OpenSSH servers
    • In the case of a network error add a close to any open files with SFTP connection
    • Fix for potential memory leak with agent and a case with wolfSHS_SFTP_GetHandle
    • Fuzzing fix for potential out of bounds read in the public key user auth messages
    • MQX build fixes
    • Sanity check that agent was set before setting the agent’s channel
    • Fuzzing fix for bounds checking with DoKexDhReply internal function
    • Fuzzing fix for clean up of base path with SCP use
    • Fuzzing fix for sanity checks on setting the prime group and generator
    • Fuzzing fix for return result of high water check
    • Fuzzing fix for null terminator in internal ReceiveScpConfirmation function
  • Improvements and Optimizations
    • Example timeout added to SFTP example
    • Update wolfSSH_ReadKey_buffer() to handle P-384 and P-521 when reading a key from a buffer
    • Use internal version of strdup
    • Use strncmp instead of memcmp for comparing session string type

wolfSSH 1.4.5


  • New Feature Additions
    • Added SSH-AGENT support to the echoserver and client
    • For testing purposes, add ability to have named users with authentication type of "none"
    • Added support for building for EWARM
    • Echoserver can now spawn a shell and set up a pty with it
    • Added example to the SCP callback for file transfers without a filesystem
  • Fixes
    • Fixes for clean connection shutdown in the example.
    • Fixes for some issues with DH KEX discovered with fuzz testing
    • Fix for an OOB read around the RSA signature
    • Fix for building with wolfSSL v4.5.0 with respect to `wc_ecc_set_rng()`; configure will detect the function's presence and work around it absence; see note in internal.c regarding the flag `HAVE_WC_ECC_SET_RNG` if not using configure
  • Improvements and Optimizations
    • Improved interoperability with winSCP
    • Improved interoperability with Dropbear
    • Example client can now authenticate with public keys

wolfSSH 1.4.4


  • New Feature Additions
    • Added wolfSCP client example
    • Added support for building for VxWorks
  • Fixes
    • Fixes for some buffer issues discovered with fuzz testing
    • Fixes for some SCP directory issues in Nucleus
    • Fixed an issue where a buffer size went negative, cosmetic
    • Fixed bug in ECDSA when using alt-ecc-size in wolfCrypt
    • Fixed bug with AES-CTR and FIPSv2 build
    • Fixed bug when using single precision
    • Fix for SCP rename action
  • Improvements and Optimizations
    • Improved interoperability with FireZilla
    • Example tool option clarification
    • Better SFTP support in 32-bit environments
    • SFTP and SCP aren't dependent on ioctl() anymore
    • Add password rejection count
    • Public key vs password authentication chosen by user auth callback
    • MQX maintenance

wolfSSH 1.4.3


  • wolfSFTP port to MQX 4.2 (MQX/MFS/RTCS)
  • Maintenance and bug fixes
  • Improvements and additions to the test cases
  • Fix some portablility between C compilers
  • Fixed an issue in the echoserver example where it would error sometimes on shutdown
  • Improvement to the global request processing
  • Fixed bug in the new keys message handler where it reported the wrong size in the data buffer; invalid value was logged, not used
  • Fixed bug in AES initialization that depended on build settings
  • Improved interoperability with puTTY
  • Added user auth callback error code for too many password failures
  • Improvements to the Nucleus filesystem abstraction
  • Added example for an "autopilot" file get and file put with the wolfSFTP example client

wolfSSH 1.4.2


  • GCC 8 build warning fixes
  • Fix for warning with enums used with SFTP and set socket type
  • Added example server with Renesas CS+ port
  • Fix for initializing UserAuthData to all zeros before use
  • Fix for SFTP “LS” operation when setting the default window size to 2048
  • Add structure size print out option -z to example client when the macro WOLFSSH_SHOW_SIZES is defined
  • Additional automated tests of wolfSSH_CTX_UsePrivateKey_buffer and fix for call when key is already loaded
  • Refactoring done to internal handling of packet assembly
  • Add client side public key authentication support
  • Support added for global requests
  • Fix for NULL dereference warning, rPad/sPad initialization and SFTP check on want read. Thanks to GitHub user LinuxJedi for the reports
  • Addition of WS_USER_AUTH_E error returned when user authentication callback returns WOLFSSH_USERAUTH_REJECTED
  • Remove void cast on variable not compiled in with single threaded builds

wolfSSH 1.4.0


  • SFTP support for time attributes
  • TCP port forwarding feature added (--enable-fwd)
  • Example tcp port forwarding added to /examples/portfwd/portfwd
  • Fixes to SCP, including default direction set
  • Fix to match ID during KEX init
  • Add check for window adjustment packets when sending large transfers
  • Fixes and maintenance to Nucleus port for file closing
  • Add enable all option (--enable-all)
  • Fix for --disable-inline build
  • Fixes for GCC-7 warnings when falling through switch statements
  • Additional sanity checks added from fuzz testing
  • Refactor and fixes for use with non blocking
  • Add extended data read for piping stderr
  • Add client side pseudo terminal connection with ./examples/client/client -t
  • Add some basic Windows terminal conversions with wolfSSH_ConvertConsole
  • Add wolfSSH_stream_peek function to peek at incoming SSH data
  • Change name of internal function SendBuffered() to avoid clash with wolfSSL
  • Add support for SFTP on Windows
  • Use int types for arguments in examples to fix Raspberry Pi build
  • Fix for fail case with leading 0’s on MPINT
  • Default window size (DEFAULT_WINDOW_SZ) lowered from ~ 1 MB to ~ 16 KB
  • Disable examples option added to configure (--disable-examples)
  • Callback function and example use added for checking public key sent
  • AES CTR cipher support added
  • Fix for free’ing ECC caches with examples
  • Renamed example SFTP to be examples/sftpclient/wolfsftp

wolfSSH 1.3.0


  • Accepted code submission from Stephen Casner for SCP support. Thanks Stephen!
  • Added SCP server support.
  • Added SFTP client and server support.
  • Updated the autoconf scripts.
  • Other bug fixes and enhancements.

wolfSSH 1.2.0


  • Added ECDH Group Exchange with SHA2 hashing and curves nistp256, nistp384, and nistp521.
  • Added ECDSA with SHA2 hashing and curves nistp256, nistp384, and nistp521.
  • Added client support.
  • Added an example client that talks to the echoserver.
  • Changed the echoserver to allow only one connection, but multiple connections are allowed with a command line option.
  • Added option to echoserver to offer an ECC public key.
  • Added a Visual Studio solution to build the library, examples, and tests.
  • Other bug fixes and enhancements.

wolfSSH 1.1.0


  • Added DH Group Exchange with SHA-256 hashing to the key exchange.
  • Removed the canned banner and provided a function to set a banner string. If no sting is provided, no banner is sent.
  • Expanded the make checking to include an API test.
  • Added a function that returns session statistics.
  • When connecting to the echoserver, hitting Ctrl-E will give you some session statistics.
  • Parse and reply to the Global Request message.
  • Fixed a bug with client initiated rekeying.
  • Fixed a bug with the GetString function.
  • Other small bug fixes and enhancements.

wolfSSH 0.2.0


This is the first release of wolfSSH.

Please see the README included in the wolfSSH download for build instructions and API reference.