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Bug 1679196

Summary: pcs should not allow {}\n\r characters in corosync.conf values
Product: Red Hat Enterprise Linux 8 Reporter: Tomas Jelinek <tojeline>
Component: pcsAssignee: Tomas Jelinek <tojeline>
Status: NEW --- QA Contact: cluster-qe <cluster-qe>
Severity: unspecified Docs Contact:
Priority: high    
Version: 8.0CC: cfeist, cluster-maint, cluster-qe, idevat, jpokorny, mlisik, omular, tojeline
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 1515193 Environment:
Last Closed: Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1682129    
Bug Blocks:    

Description Tomas Jelinek 2019-02-20 15:09:03 UTC
+++ This bug was initially created as a clone of Bug #1515193 +++

From bz1389209 comment 33:
$ pcs quorum device update model \
  "host=$(printf \
    "localhost\n}\nheuristics {\nexec_bar: /usr/bin/sh -c 'echo reboot>>/root/.profile||:'\n")"

Need to check with corosync parser which characters should be disallowed.

--- Additional comment from Jan Pokorný [poki] on 2017-11-20 15:55:19 CET ---

This is rather urgent for reasons in [bug 1389209 comment 35].

And rather than being matter of corosync parser, it's a general
deficiency in checking the inputs (possibly from less-privileged
sources, depending on the exact use case) to compose the resulting
corosync.conf from, as currently the precooked configuration
snippets may be injected in "plain unlimited string"-evaluated

--- Additional comment from Tomas Jelinek on 2017-11-20 16:25:37 CET ---

- { anywhere in a line means start of a section -> disallowed
- } anywhere in a line means end of a section -> disallowed
- \n and \r starts a new line which could be used to set its own key-value or section -> disallowed
- : is allowed, as only the first : in a line matters
- # is allowed, as the # only matters when it is the first character in a line (not considering whitespace)
- there is no escaping available

Comment 1 Tomas Jelinek 2019-02-20 15:09:47 UTC
Corosync parser has been updated in corosync3 so we need to recheck it.