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Make config variables matching stricter

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This prevents strings such as ${whatever} from getting
confused for env variables and resulting in config errors
This commit is contained in:
Svilen Markov 2025-03-20 16:53:02 +00:00
parent 43b8f8f31b
commit e566dcd0d9
1 changed files with 35 additions and 18 deletions
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53
internal/glance/config.go
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@ -107,6 +107,7 @@ func newConfigFromYAML(contents []byte) (*config, error) {
return config, nil
}
var envVariableNamePattern = regexp.MustCompile(`^[A-Z0-9_]+$`)
var configVariablePattern = regexp.MustCompile(`(^|.)\$\{(?:([a-zA-Z]+):)?([a-zA-Z0-9_-]+)\}`)
// Parses variables defined in the config such as:
@ -132,10 +133,6 @@ func parseConfigVariables(contents []byte) ([]byte, error) {
return match
}
typeAsString := string(groups[2])
variableType := ternary(typeAsString == "", configVarTypeEnv, typeAsString)
value := string(groups[3])
prefix := string(groups[1])
if prefix == `\` {
if len(match) >= 2 {
@ -145,12 +142,19 @@ func parseConfigVariables(contents []byte) ([]byte, error) {
}
}
parsedValue, localErr := parseConfigVariableOfType(variableType, value)
typeAsString, variableName := string(groups[2]), string(groups[3])
variableType := ternary(typeAsString == "", configVarTypeEnv, typeAsString)
parsedValue, returnOriginal, localErr := parseConfigVariableOfType(variableType, variableName)
if localErr != nil {
err = fmt.Errorf("parsing variable: %v", localErr)
return nil
}
if returnOriginal {
return match
}
return []byte(prefix + parsedValue)
})
@ -161,37 +165,50 @@ func parseConfigVariables(contents []byte) ([]byte, error) {
return replaced, nil
}
func parseConfigVariableOfType(variableType, value string) (string, error) {
// When the bool return value is true, it indicates that the caller should use the original value
func parseConfigVariableOfType(variableType, variableName string) (string, bool, error) {
switch variableType {
case configVarTypeEnv:
v, found := os.LookupEnv(value)
if !found {
return "", fmt.Errorf("environment variable %s not found", value)
if !envVariableNamePattern.MatchString(variableName) {
return "", true, nil
}
return v, nil
v, found := os.LookupEnv(variableName)
if !found {
return "", false, fmt.Errorf("environment variable %s not found", variableName)
}
return v, false, nil
case configVarTypeSecret:
secretPath := filepath.Join("/run/secrets", value)
secretPath := filepath.Join("/run/secrets", variableName)
secret, err := os.ReadFile(secretPath)
if err != nil {
return "", fmt.Errorf("reading secret file: %v", err)
return "", false, fmt.Errorf("reading secret file: %v", err)
}
return strings.TrimSpace(string(secret)), nil
return strings.TrimSpace(string(secret)), false, nil
case configVarTypeFileFromEnv:
filePath, found := os.LookupEnv(value)
if !envVariableNamePattern.MatchString(variableName) {
return "", true, nil
}
filePath, found := os.LookupEnv(variableName)
if !found {
return "", fmt.Errorf("readFileFromEnv: environment variable %s not found", value)
return "", false, fmt.Errorf("readFileFromEnv: environment variable %s not found", variableName)
}
if !filepath.IsAbs(filePath) {
return "", false, fmt.Errorf("readFileFromEnv: file path %s is not absolute", filePath)
}
fileContents, err := os.ReadFile(filePath)
if err != nil {
return "", fmt.Errorf("readFileFromEnv: reading file from %s: %v", value, err)
return "", false, fmt.Errorf("readFileFromEnv: reading file from %s: %v", variableName, err)
}
return strings.TrimSpace(string(fileContents)), nil
return strings.TrimSpace(string(fileContents)), false, nil
default:
return "", fmt.Errorf("unknown variable type %s with value %s", variableType, value)
return "", true, nil
}
}