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Improve suspicious env checks #5

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Improve suspicious env checks #5

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36 changes: 31 additions & 5 deletions dockerfile-security.rego
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Original file line number Diff line number Diff line change
Expand Up @@ -14,13 +14,39 @@ secrets_env = [
"tkn"
]

deny[msg] {
input[i].Cmd == "env"
val := input[i].Value
contains(lower(val[_]), secrets_env[_])
msg = sprintf("Line %d: Potential secret in ENV key found: %s", [i, val])
deny[msg] {
dockerenvs := [val | input[i].Cmd == "env"; val := input[i].Value]
dockerenv := dockerenvs[_]
envvar := dockerenv[_]
lower(envvar) == secrets_env[_]
msg = sprintf("Line %d: Potential secret in ENV key found: %s", [i, envvar])
}

deny[msg] {
dockerenvs := [val | input[i].Cmd == "env"; val := input[i].Value]
dockerenv := dockerenvs[_]
envvar := dockerenv[_]
startswith(lower(envvar), secrets_env[_])
msg = sprintf("Line %d: Potential secret in ENV key found: %s", [i, envvar])
}

deny[msg] {
dockerenvs := [val | input[i].Cmd == "env"; val := input[i].Value]
dockerenv := dockerenvs[_]
envvar := dockerenv[_]
endswith(lower(envvar), secrets_env[_])
msg = sprintf("Line %d: Potential secret in ENV key found: %s", [i, envvar])
}

deny[msg] {
dockerenvs := [val | input[i].Cmd == "env"; val := input[i].Value]
dockerenv := dockerenvs[_]
envvar := dockerenv[_]
parts := regex.split("[ :=_-]", envvar)
part := parts[_]
lower(part) == secrets_env[_]
msg = sprintf("Line %d: Potential secret in ENV key found: %s", [i, envvar])

# Only use trusted base images
deny[msg] {
input[i].Cmd == "from"
Expand Down