bug#15792: 24.3; Builtin TLS support should enable certificate verification support by default

bug#15792: 24.3; Builtin TLS support should enable certificate verification support by default

[Vincent Bernat]

Hi!

New builtin TLS support disables certificate verification by
default. This is a very bad practice and the default should be to check
for certificate validity.

Moreover, the end-user of a package using this builtin support has no
easy way to enable the verification of TLS certificates. For example,
Gnus does not provide anything to enable this and as a simple user, it
seems quite difficult to ensure that certificates are verified. And each
package has the responsability to enable this option. This is
cumbersome.

Previously, enabling/disabling certificate verification was easy. You
set `tls-program` variable to something that checks or don't check for
certificates. For gnutls-client, this was a matter of using or not using
the `--insecure` switch.

I didn't find a way to disable the builtin TLS support (other than to
recompile Emacs).

I propose:

 1. Verify the certificates by default.
 2. Prompt the user if there is a problem.
 3. Add the possibility to not check for certificates by default.

I can provide a patch for the first step but I have little Emacs-fu for
the other two parts (all the more that most of the code is in C).
-- 
Use variable names that mean something.
            - The Elements of Programming Style (Kernighan & Plauger)

bug#15792: 24.3; Builtin TLS support should enable certificate verification support by default

[Glenn Morris]

See http://debbugs.gnu.org/13374 and related discussion.

bug#15792: 24.3; Builtin TLS support should enable certificate verification support by default

[Vincent Bernat]

 ❦  2 novembre 2013 19:48 CET, Glenn Morris <rgm@gnu.org> :

> See http://debbugs.gnu.org/13374 and related discussion.

Thanks! Sorry for the duplicate, I didn't find this bug report.
-- 
printk("??? No FDIV bug? Lucky you...\n");
	2.2.16 /usr/src/linux/include/asm-i386/bugs.h