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lib/protocol: Deterministic encrypted version (fixes #7533) (#7538)

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Simon Frei 2021-03-31 08:59:15 +02:00 committed by GitHub
parent 34f0feb13a
commit 0dcd9794d4
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1 changed files with 8 additions and 4 deletions
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10
lib/protocol/encryption.go
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@ -15,7 +15,6 @@ import (
"io" "io"
"strings" "strings"
"sync" "sync"
"time"
"github.com/gogo/protobuf/proto" "github.com/gogo/protobuf/proto"
"github.com/miscreant/miscreant.go" "github.com/miscreant/miscreant.go"
@ -254,21 +253,26 @@ func encryptFileInfo(fi FileInfo, folderKey *[keySize]byte) FileInfo {
encryptedFI := encryptBytes(bs, fileKey) encryptedFI := encryptBytes(bs, fileKey)
// The vector is set to something that is higher than any other version sent // The vector is set to something that is higher than any other version sent
// previously, assuming people's clocks are correct. We do this because // previously. We do this because
// there is no way for the insecure device on the other end to do proper // there is no way for the insecure device on the other end to do proper
// conflict resolution, so they will simply accept and keep whatever is the // conflict resolution, so they will simply accept and keep whatever is the
// latest version they see. The secure devices will decrypt the real // latest version they see. The secure devices will decrypt the real
// FileInfo, see the real Version, and act appropriately regardless of what // FileInfo, see the real Version, and act appropriately regardless of what
// this fake version happens to be. // this fake version happens to be.
// The vector also needs to be deterministic/the same among all trusted
// devices with the same vector, such that the pulling/remote completion
// works correctly on the untrusted device(s).
version := Vector{ version := Vector{
Counters: []Counter{ Counters: []Counter{
{ {
ID: 1, ID: 1,
Value: uint64(time.Now().UnixNano()),
}, },
}, },
} }
for _, counter := range fi.Version.Counters {
version.Counters[0].Value += counter.Value
}
// Construct the fake block list. Each block will be blockOverhead bytes // Construct the fake block list. Each block will be blockOverhead bytes
// larger than the corresponding real one and have an encrypted hash. // larger than the corresponding real one and have an encrypted hash.