[9.0.1] Unable to send mails encrypt using S/MIME certificates

[tuxmaster5000]

Expected behavior

That it is possible to send encrypted mails using S/MIME certificates.
Using an gpg public key works fine.

Actual behavior

No mail is generated, because the certificate is not found.

Steps to reproduce

1. Log into gsa
2. Import an new X.509 certificate under credentials.
3. Add an new email alert using encrypted mail and the certificate
4. Test the alert.

GVM versions

gsa: Greenbone Security Assistant 9.0.1

gvm: Greenbone Vulnerability Manager 9.0.1

openvas-scanner: OpenVAS 7.0.1

gvm-libs: gvm-libs 11.0.1

Environment

Operating system: CentOS 7.8

Installation method / source: Using github sources

Logfiles

/var/log/greenbone/gvmd/gvmd.log:

util gpgme:WARNING:2020-05-15 08h31.50 CEST:25464: find_email_encryption_key: No suitable key found for foo@foo.foo
util gpgme:WARNING:2020-05-15 08h31.50 CEST:25464: encrypt_stream_internal: Could not find certificate for encryption
md manage:WARNING:2020-05-15 08h31.50 CEST:25464: email_encrypt_smime: encryption failed
md manage:WARNING:2020-05-15 08h31.50 CEST:25464: email: S/MIME encryption failed

[bjoernricks]

Should be re-tested with current version. If it is still valid please re-open.

[gs4711]

Jun 9 10:47:21 iz-ad-41 gvmd[4204]: find_email_encryption_key: Found matching UID for DummyUser@h-ka.de
Jun 9 10:47:21 iz-ad-41 gvmd[4204]: g_lstat(/tmp/gvmd-gpg-V96Z15/.#lk0x000055d0335a17b0.iz-ad-41.4209) failed - No such file or directory
Jun 9 10:47:21 iz-ad-41 gvmd[4204]: Failed to remove .#lk0x000055d0335a17b0.iz-ad-41.4209 from /tmp/gvmd-gpg-V96Z15!
Jun 9 10:47:21 iz-ad-41 gvmd[4204]: email_encrypt_smime: encryption failed
Jun 9 10:47:21 iz-ad-41 gvmd[4204]: email: S/MIME encryption failed
Jun 9 10:47:21 iz-ad-41 command-wrapper[20599]: encrypt_stream_internal: gpgme_op_encrypt failed: Missing issuer certificate

Still seems to be broken.