[Bug 1822984] Re: revert tls security level back to 1

[Dimitri John Ledkov]

generated new weak key, cert and try to use it with current cosmic's
openssl and succeed:

# openssl genrsa -des3 -out myCA.key 600
# openssl req -x509 -new -nodes -key myCA.key -sha256 -days 1825 -out myCA.pem
# openssl s_server -cert myCA.pem -key myCA.key -WWW

# wget --ca-certificate myCA.pem https://localhost:4433
--2019-04-11 16:18:41--  https://localhost:4433/
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:4433... connected.
HTTP request sent, awaiting response... 200 ok
Length: unspecified [text/plain]
Saving to: 'index.html.2'

index.html.2                                 [ <=>
]     237  --.-KB/s    in 0s

2019-04-11 16:18:41 (15.6 MB/s) - 'index.html.2' saved [237]

# dpkg -l | grep libssl
ii  libssl1.1:amd64            1.1.1-1ubuntu2 

Upgraded to:
# dpkg -l | grep libssl
ii  libssl1.1:amd64            1.1.1-1ubuntu2.2

And now wget fails with too small key error, whilst the s_server is
still running:

# wget --ca-certificate myCA.pem https://localhost:4433
--2019-04-11 16:20:09--  https://localhost:4433/
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:4433... connected.
ERROR: cannot verify localhost's certificate, issued by 'CN=localhost,O=Internet Widgits Pty Ltd,ST=Some-State,C=AU':
  EE certificate key too weak
To connect to localhost insecurely, use `--no-check-certificate'.

** Tags removed: verification-needed verification-needed-cosmic
** Tags added: verification-done verification-done-cosmic

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https://bugs.launchpad.net/bugs/1822984

Title:
  revert tls security level back to 1

Status in openssl package in Ubuntu:
  Fix Released
Status in openssl source package in Cosmic:
  Fix Committed
Status in openssl source package in Disco:
  Fix Released

Bug description:
  [Impact]
  * increase minimum default tls security level from 0 to 1, as is the default upstream

  [Test Case]

  * generate 80bits TLS certificate and attempt to use it

  * with prior openssl it should work, but with this update it should
  fail

  [Regression Potential]

  * This increases the minimum required certificate/keys sizes and
  algorithms, back to what Bionic GA openssl 1.1.0 shipped as. It also
  now will match upstream default. It is still lower than Debian's
  default that raises it to 2 by default.

  * Cosmic GA shipped with TLS_SECURITY_LEVEL 0, meaning pretty much any
  weak keys were accepted. With this change keys lower than 112 will be
  rejected, which are considered to be too weak to be useful by most CAs
  out there.

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