Merge pull request #8 from safing/fix/slice-space

Copy input data if slice has additional space

core.go

@@ -19,6 +19,15 @@ func (s *Session) Close(data []byte) (*Letter, error) { //nolint:gocognit
 		letter.SuiteID = s.envelope.SuiteID
 	}
 
+	// Check for additional data in slice, which we should not touch.
+	// TODO: Pre-allocate needed overhead for AEAD and others.
+	if len(data) != cap(data) {
+		// Make a copy of the data in order to not modify unrelated data.
+		copiedData := make([]byte, len(data))
+		copy(copiedData, data)
+		data = copiedData
+	}
+
 	/////////////////
 	// key management
 	/////////////////

go.sum

@@ -23,6 +23,7 @@ github.com/StackExchange/wmi v0.0.0-20210224194228-fe8f1750fd46/go.mod h1:3eOhrU
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+github.com/aead/serpent v0.0.0-20160714141033-fba169763ea6 h1:5L8Mj9Co9sJVgW3TpYk2gxGJnDjsYuboNTcRmbtGKGs=
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@@ -35,6 +36,7 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24
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+github.com/bluele/gcache v0.0.2 h1:WcbfdXICg7G/DGBh1PFfcirkWOQV+v077yF1pSy3DGw=
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@@ -70,6 +72,7 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
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+github.com/gofrs/uuid v4.0.0+incompatible h1:1SD/1F5pU8p29ybwgQSwpQk+mwdRrXCYuPhW6m+TnJw=
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@@ -103,7 +106,9 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4
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+github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
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+github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
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@@ -209,8 +214,11 @@ github.com/safing/portbase v0.11.0/go.mod h1:Xb0htNFFEb6BlkloWyVbQoUguUMGrTVmEDw
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+github.com/seehuhn/sha256d v1.0.0 h1:TXTsAuEWr02QjRm153Fnvvb6fXXDo7Bmy1FizxarGYw=
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+github.com/shirou/gopsutil v3.21.2+incompatible h1:U+YvJfjCh6MslYlIAXvPtzhW3YZEtc9uncueUNpD/0A=
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@@ -244,10 +252,14 @@ github.com/tevino/abool v0.0.0-20170917061928-9b9efcf221b5 h1:hNna6Fi0eP1f2sMBe/
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