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When the user tries to add a string to the CONF_ssh_manual_hostkeys list box, we call a validation function which is supposed to look along the string for either a valid-looking SSH key fingerprint, or a base64 public key blob, and after it finds it, move that key alone to the start of the input string and delete all the surrounding cruft. SHA-256 key fingerprints were being detected all right, but not moved to the start of the string sensibly - we just returned true without rewriting anything. (Probably inadequate testing when I added SHA-256 fairly recently.) And the code that moved a full public-key blob to the front of the string triggered an ASan error on the grounds that it used strcpy with the source and destination overlapping. I actually hadn't known that was supposed to be a bad thing these days! But it's easily fixed by making it a memmove instead.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.