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Description of problem:

In FIPS mode ssh-keygen -A used to generate all host keys fails because DSA key cannot be generated because it is not allowed in FIPS mode. Unfortunately, keys to be generated after DSA one are not generated as a consequence. 

Version-Release number of selected component (if applicable):

openssh-8.0p1-2.el8

How reproducible:

100% in FIPS mode

Steps to Reproduce:

1. rm /etc/ssh/ssh_host_*
2. ssh-keygen -A
3. ls /etc/ssh/ssh_host_*

Actual results:

(FIPS MODE)

# ssh-keygen -A -m PEM
ssh-keygen: generating new host keys: RSA DSA DSA keys are not allowed in FIPS mode

# ls /etc/ssh/ssh_host_*
/etc/ssh/ssh_host_dsa_key.nxIYddPPw0  /etc/ssh/ssh_host_rsa_key  /etc/ssh/ssh_host_rsa_key.pub

Expected results:

DSA key is skipped and the rest is generated.

Additional info:

(NON_FIPS MODE)

# ssh-keygen -A -m PEM
ssh-keygen: generating new host keys: RSA DSA ECDSA ED25519 

# ls /etc/ssh/ssh_host_*
/etc/ssh/ssh_host_dsa_key      /etc/ssh/ssh_host_ecdsa_key.pub    /etc/ssh/ssh_host_rsa_key
/etc/ssh/ssh_host_dsa_key.pub  /etc/ssh/ssh_host_ed25519_key      /etc/ssh/ssh_host_rsa_key.pub
/etc/ssh/ssh_host_ecdsa_key    /etc/ssh/ssh_host_ed25519_key.pub

Created attachment 1592876 [details]
proposed patch

I think this never worked in any previous releases, but I believe it would make sense to fix this.

The attached patch should address the issue.

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, 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/RHSA-2019:3702