-
Notifications
You must be signed in to change notification settings - Fork 18
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
10 changed files
with
300 additions
and
78 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| // TODO(@Wondertan): Should be just part of sync pkg and not subpkg | ||
| // | ||
| // Fix after adjacency requirement is removed from the Store. | ||
| package verify | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/celestiaorg/go-header" | ||
| ) | ||
|
|
||
| // DefaultHeightThreshold defines default height threshold beyond which headers are rejected | ||
| // NOTE: Compared against subjective head which is guaranteed to be non-expired | ||
| const DefaultHeightThreshold int64 = 40000 // ~ 7 days of 15 second headers | ||
|
|
||
| // VerifyError is thrown during for Headers failed verification. | ||
| type VerifyError struct { | ||
| // Reason why verification failed as inner error. | ||
| Reason error | ||
| // SoftFailure means verification did not have enough information to definitively conclude a | ||
| // Header was correct or not. | ||
| // May happen with recent Headers during unfinished historical sync or because of local errors. | ||
| // TODO(@Wondertan): Better be part of signature Header.Verify() (bool, error), but kept here | ||
| // not to break | ||
| SoftFailure bool | ||
| } | ||
|
|
||
| func (vr *VerifyError) Error() string { | ||
| return fmt.Sprintf("header: verify: %s", vr.Reason.Error()) | ||
| } | ||
|
|
||
| func (vr *VerifyError) Unwrap() error { | ||
| return vr.Reason | ||
| } | ||
|
|
||
| // Verify verifies untrusted Header against trusted following general Header checks and | ||
| // custom user-specific checks defined in Header.Verify | ||
| // | ||
| // If heightThreshold is zero, uses DefaultHeightThreshold. | ||
| // Always returns VerifyError. | ||
| func Verify[H header.Header](trstd, untrstd H, heightThreshold int64) error { | ||
| // general mandatory verification | ||
| err := verify[H](trstd, untrstd, heightThreshold) | ||
| if err != nil { | ||
| return &VerifyError{Reason: err} | ||
| } | ||
| // user defined verification | ||
| err = trstd.Verify(untrstd) | ||
| if err == nil { | ||
| return nil | ||
| } | ||
| // if that's an error, ensure we always return VerifyError | ||
| var verErr *VerifyError | ||
| if !errors.As(err, &verErr) { | ||
| verErr = &VerifyError{Reason: err} | ||
| } | ||
| // check adjacency of failed verification | ||
| adjacent := untrstd.Height() == trstd.Height()+1 | ||
| if !adjacent { | ||
| // if non-adjacent, we don't know if the header is *really* wrong | ||
| // so set as soft | ||
| verErr.SoftFailure = true | ||
| } | ||
| // we trust adjacent verification to it's fullest | ||
| // if verification fails - the header is *really* wrong | ||
| return verErr | ||
| } | ||
|
|
||
| // verify is a little bro of Verify yet performs mandatory Header checks | ||
| // for any Header implementation. | ||
| func verify[H header.Header](trstd, untrstd H, heightThreshold int64) error { | ||
| if heightThreshold == 0 { | ||
| heightThreshold = DefaultHeightThreshold | ||
| } | ||
|
|
||
| if untrstd.IsZero() { | ||
| return fmt.Errorf("zero header") | ||
| } | ||
|
|
||
| if untrstd.ChainID() != trstd.ChainID() { | ||
| return fmt.Errorf("wrong header chain id %s, not %s", untrstd.ChainID(), trstd.ChainID()) | ||
| } | ||
|
|
||
| if !untrstd.Time().After(trstd.Time()) { | ||
| return fmt.Errorf("unordered header timestamp %v is before %v", untrstd.Time(), trstd.Time()) | ||
| } | ||
|
|
||
| now := time.Now() | ||
| if !untrstd.Time().Before(now.Add(clockDrift)) { | ||
| return fmt.Errorf("header timestamp %v is from future (now: %v, clock_drift: %v)", untrstd.Time(), now, clockDrift) | ||
| } | ||
|
|
||
| known := untrstd.Height() <= trstd.Height() | ||
| if known { | ||
| return fmt.Errorf("known header height %d, current %d", untrstd.Height(), trstd.Height()) | ||
| } | ||
| // reject headers with height too far from the future | ||
| // this is essential for headers failed non-adjacent verification | ||
| // yet taken as sync target | ||
| adequateHeight := untrstd.Height()-trstd.Height() < heightThreshold | ||
| if !adequateHeight { | ||
| return fmt.Errorf("header height %d is far from future (current: %d, threshold: %d)", untrstd.Height(), trstd.Height(), heightThreshold) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // clockDrift defines how much new header's time can drift into | ||
| // the future relative to the now time during verification. | ||
| var clockDrift = 10 * time.Second |
Oops, something went wrong.