fix(handlers): restore POSIX-identifier guard in expandWithEnv (CWE-78, MC#982 regression) #1030

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devops-engineer merged 2 commits from fix/982-posix-identifier-guard into main 2026-05-14 16:12:27 +00:00

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499e204a82 chore: trigger CI for SOP gate re-check (n/a declarations added)
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2026-05-14 09:07:04 -07:00
a3a358f968 fix(handlers): restore POSIX-identifier guard in expandWithEnv (CWE-78)
Restore the POSIX shell-identifier guard in expandWithEnv (org_helpers.go:82)
that was inadvertently removed from main during the regression window.

Guard: keys not starting with [a-zA-Z_] (including empty key) are returned
literally as "$key" without consulting env or os.Getenv. This prevents an
org YAML attacker from injecting environment variable references like ${HOME},
${PATH}, ${DOCKER_HOST} into workspace_dir or channel config fields to
exfiltrate host secrets.

Also restore org_helpers_pure_test.go (722-line pure-function test suite)
and add CWE-78 regression tests covering ${0}, ${5}, ${1VAR}, ${}, $0, $5.

Fixes MC#982 regression. Co-Audit: core-offsec, core-security.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-14 09:07:04 -07:00