* fix(kms): do not include secret value in static KMS format error
The malformed-format error message in build_static_kms_config embedded the
raw env var value. The most likely misconfiguration is setting
RUSTFS_KMS_STATIC_SECRET_KEY to the bare base64 key without the <key-name>:
prefix, in which case the full secret key material would be written to
startup logs. Drop the value from the message, matching the equivalent
parsing error in KmsConfig::from_env().
* chore(security): add guardrails against secret values in error strings
Follow-up to the PR #5222 review finding fixed in PR #5243: a config value
that fails secret-format parsing is typically the raw secret itself, and
error messages are log content — they propagate via ? and are printed by
startup/error logging far from the construction site.
Three layers so this class of leak is caught earlier next time:
- security-advisory-lessons: state explicitly that error/panic messages are
log content; parse-failure hints must name the env var and expected
format, never echo the input. Add a matching review prompt.
- adversarial-validation: add a security-reviewer probe that greps
error-construction sites on secret-bearing config paths for interpolation
of the raw value, including the duplicated-parse trap where the leak hid.
- check_logging_guardrails.sh: mechanical backstop — flag inline format
interpolation of secret-named identifiers (secret/password/passwd/
private_key) in checked files; add crates/kms/src/config.rs (the twin
parse site) to the checked list. Verified the check passes on the fixed
tree and catches the original leak at rustfs/src/init.rs:399.
Zhengchao An