79 lines
2.6 KiB
Go
79 lines
2.6 KiB
Go
package configfile
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import (
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"fmt"
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"github.com/rfjakob/gocryptfs/v2/internal/contentenc"
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)
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// Validate that the combination of settings makes sense and is supported
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func (cf *ConfFile) Validate() error {
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if cf.Version != contentenc.CurrentVersion {
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return fmt.Errorf("Unsupported on-disk format %d", cf.Version)
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}
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// scrypt params ok?
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if err := cf.ScryptObject.validateParams(); err != nil {
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return err
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}
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// All feature flags that are in the config file are known?
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for _, flag := range cf.FeatureFlags {
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if !isFeatureFlagKnown(flag) {
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return fmt.Errorf("Unknown feature flag %q", flag)
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}
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}
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// File content encryption
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{
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if cf.IsFeatureFlagSet(FlagXChaCha20Poly1305) && cf.IsFeatureFlagSet(FlagAESSIV) {
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return fmt.Errorf("Can't have both XChaCha20Poly1305 and AESSIV feature flags")
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}
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if cf.IsFeatureFlagSet(FlagAESSIV) && !cf.IsFeatureFlagSet(FlagGCMIV128) {
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return fmt.Errorf("AESSIV requires GCMIV128 feature flag")
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}
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if cf.IsFeatureFlagSet(FlagXChaCha20Poly1305) {
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if cf.IsFeatureFlagSet(FlagGCMIV128) {
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return fmt.Errorf("XChaCha20Poly1305 conflicts with GCMIV128 feature flag")
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}
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if !cf.IsFeatureFlagSet(FlagHKDF) {
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return fmt.Errorf("XChaCha20Poly1305 requires HKDF feature flag")
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}
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}
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// The absence of other flags means AES-GCM (oldest algorithm)
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if !cf.IsFeatureFlagSet(FlagXChaCha20Poly1305) && !cf.IsFeatureFlagSet(FlagAESSIV) {
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if !cf.IsFeatureFlagSet(FlagGCMIV128) {
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return fmt.Errorf("AES-GCM requires GCMIV128 feature flag")
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}
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}
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}
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// Filename encryption
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{
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if cf.IsFeatureFlagSet(FlagPlaintextNames) {
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if cf.IsFeatureFlagSet(FlagEMENames) {
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return fmt.Errorf("PlaintextNames conflicts with EMENames feature flag")
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}
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if cf.IsFeatureFlagSet(FlagDirIV) {
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return fmt.Errorf("PlaintextNames conflicts with DirIV feature flag")
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}
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if cf.IsFeatureFlagSet(FlagLongNames) {
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return fmt.Errorf("PlaintextNames conflicts with LongNames feature flag")
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}
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if cf.IsFeatureFlagSet(FlagRaw64) {
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return fmt.Errorf("PlaintextNames conflicts with Raw64 feature flag")
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}
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if cf.IsFeatureFlagSet(FlagLongNameMax) {
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return fmt.Errorf("PlaintextNames conflicts with LongNameMax feature flag")
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}
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}
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if cf.IsFeatureFlagSet(FlagEMENames) {
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// All combinations of DirIV, LongNames, Raw64 allowed
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}
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if cf.LongNameMax != 0 && !cf.IsFeatureFlagSet(FlagLongNameMax) {
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return fmt.Errorf("LongNameMax=%d but the LongNameMax feature flag is NOT set", cf.LongNameMax)
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}
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if cf.LongNameMax == 0 && cf.IsFeatureFlagSet(FlagLongNameMax) {
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return fmt.Errorf("LongNameMax=0 but the LongNameMax feature flag IS set")
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}
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}
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return nil
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}
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