Bug 1477613
| Summary: | Update SELinux policy for SSH and Crypto policies | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Jakub Jelen <jjelen> |
| Component: | selinux-policy | Assignee: | Lukas Vrabec <lvrabec> |
| Status: | CLOSED NOTABUG | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | rawhide | CC: | dominick.grift, dwalsh, lsm5, lvrabec, mgrepl, plautrba, pmoore, ssekidde |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2017-08-14 15:46:30 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 1479271 | ||
Solved differently in the latest build. Closing this bug. |
Description of problem: The Crypto policies in server requires some changes in the SSHD server structure and we went a way of simple script instead of modification of the SSHD server itself. From there we need to create a temporary files under /run/openssh/, but the sshd server is not allowed to read the files with the labels under this path. So far, there is a hack in the PreStart script, that changes the label to etc_t from var_run_t so we can start the daemon. ls -Z $SSHD_CONFIG_RUNTIME | grep -q var_run_t && chcon -t etc_t $SSHD_CONFIG_RUNTIME Better solution would be to create a special label for this file (and directory) so it is accessible only by the SSHD. The AVC we are getting without this workaround: type=AVC msg=audit(1501604780.224:775): avc: denied { read } for pid=2789 comm="sshd" name="sshd_config" dev="tmpfs" ino=59058 scontext=system_u:system_r:sshd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_run_t:s0 tclass=file permissive=0 Alternatively we can also create some policy for helper script /usr/libexec/openssh/sshd-pre Version-Release number of selected component (if applicable): Fedora 27 How reproducible: always Steps to Reproduce: 1. Install openssh 2. Remove the above workaround from /usr/libexec/openssh/sshd-pre 3. Remove /run/openssh/sshd_config 4. Restart the sshd service Actual results: The service fails, the above AVC is visible in the audit log Expected results: The service starts, no AVCs Additional info: https://fedoraproject.org/wiki/Changes/OpenSSH_Server_Crypto_Policy