Make it possible to configure {imap,smtp}_certificate_checks

[link2xt]

No description provided.

[link2xt]

WIP, waiting for deltachat/deltachat-core-rust#751

After that, constants need to be generated.

[link2xt]

I have updated core in this branch.

So far my attempts to use this branch with Desktop (via npm link) result in segfaults. Electron starts, print the logfile name and dies with SIGSEGV. Log file is empty.

[Jikstra]

So far my attempts to use this branch with Desktop (via npm link) result in segfaults. Electron starts, print the logfile name and dies with SIGSEGV. Log file is empty.

Ay. Currently i'm on mobile internet so can't do big pulls. I will give this a try but would refuse to merge this until that segfault is fixed. Thanks for pushing the certificate checks, i like this! I will be a bit off until the first november, hope to be able to review your prs until then but probably it won't happen before the first. @ralphtheninja maybe you can help out?

[link2xt]

@Jikstra @Simon-Laux already updated it, the question now is if it works with Desktop. Going to test later today.

[link2xt]

Rebased the PR.

Just tested it, did git clean -xffd ., removed all submodules etc. First built desktop repo as usual, ran it. Then did npm link ../deltachat-node and rebuilt it.

It works! Now I am not sure what the problem was, maybe different parts of code were compiled with different values of DC_STR_COUNT. Can't reproduce it anymore to run under gdb.

I entered my login and password, opened advanced settings, entered SMTP password again (otherwise login button does not activate, I am not sure that is correct behaviour, maybe remove this check?) and selected "strict" twice.

The result of sqlite3 ~/.config/DeltaChat/*/db.sqlite 'select * from config where not keyname like "%_pw"' is:

...
10|imap_certificate_checks|1
12|smtp_certificate_checks|1
...
23|configured_imap_certificate_checks|1
...
28|configured_smtp_certificate_checks|1

1 means DC_CERTCK_STRICT