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Description of problem:
mkcert.sh script fails to generate certificate when system is running in FIPS mode

Version-Release number of selected component (if applicable):
dovecot-2.2.10-4.el7.x86_64
openssl-1.0.1e-34.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. Switch system to FIPS mode
2. run /usr/libexec/dovecot/mkcert.sh
3.

Actual results:
Generating a 1024 bit RSA private key
Error Generating Key
139692622727072:error:2D07406D:FIPS routines:RSA_BUILTIN_KEYGEN:invalid key length:rsa_gen.c:190:

Expected results:
Self signed 

Additional info:
Issue caused by default setting in /etc/pki/dovecot/dovecot-openssl.cnf:
[ req ]
default_bits = 1024

New FIPS requirements don't allow RSA key lengths other than 2048 and 3072.

This is not necessarily a FIPS related issue; generating 1024-bit keys by default seems to be a security issue.

(In reply to Nikos Mavrogiannopoulos from comment #4)
> This is not necessarily a FIPS related issue; generating 1024-bit keys by
> default seems to be a security issue.

I'd rather call this a security hardening, so no CVE, but it surely is recommended to fix this.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (dovecot bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:3921