[Bug 3379] New: Config parser only allows SetEnv once

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3379

            Bug ID: 3379
           Summary: Config parser only allows SetEnv once
           Product: Portable OpenSSH
           Version: 8.8p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: bugzilla at streibelt.net

When using SetEnv in the .ssh/config it can only be used once.

Every additional entry will be ignored.

looking at readconf.c:1758 I see that options->num_setenv is being
checked to be != 0 and then continuing.

This leads to these configurations NOT to work as intended:

SetEnv TZ=UTC
SetEnv TERM=xterm

Here only TZ will be set.

Also when SetEnv is being used globally, it cannot be used later inside
a Host definition to specify additional variables or change them.

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