This is triggered by a new config option, or alternatively a -cert
command-line option. You provide a certificate file (i.e. a public key
containing one of the cert key formats), and then, whenever you
authenticate with a private key that matches the public key inside
that certificate, the certificate will be sent to the server in place
of whatever public key it would have used before.
I expect this to be more convenient for some users than the approach
of baking the certificate into a modified version of the PPK file -
especially users who want to use different certificates on the same
key, either in sequence (if a CA continually reissues certificates
with short lifetimes) or in parallel (if different hosts trust
different CAs).
In particular, this substitution is applied consistently, even when
doing authentication via an agent. So if your bare private key is held
in Pageant, you can _still_ specify a detached certificate, and PuTTY
will spot that the key it's picked from Pageant matches that
certificate, and do the same substitution.
The detached certificate also overrides an existing certificate, if
there was one on the public key already.
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.
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