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feat: get current unix time for verification with NTS (#35)
otherwise it could have been faked from the host.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| // SPDX-License-Identifier: MPL-2.0 | ||
| // Copyright (c) Matter Labs | ||
| // | ||
| // Gets the rough network time using NTS-KE. | ||
| // It queries a number of servers and returns the time from the last server that responds. | ||
| // It returns an error if it fails to query enough servers or if the time fluctuates too much. | ||
|
|
||
| package vault_auth_tee | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| "fmt" | ||
| "gitlab.com/hacklunch/ntp" | ||
| "gitlab.com/hacklunch/ntske" | ||
| "log" | ||
| "math/rand" | ||
| "time" | ||
| ) | ||
|
|
||
| // Gets the rough network time using NTS-KE. | ||
| // It queries a number of servers and returns the time from the last server that responds. | ||
| // It returns an error if it fails to query enough servers or if the time fluctuates too much. | ||
| func getRoughNtsUnixTime() (time.Time, error) { | ||
| tlsconfig := &tls.Config{} | ||
| servers := []string{ | ||
| "time.cloudflare.com", | ||
| "nts.ntp.se", | ||
| "gps.ntp.br", | ||
| "paris.time.system76.com", | ||
| "ntp3.fau.de", | ||
| "ptbtime1.ptb.de", | ||
| "ntppool1.time.nl", | ||
| "nts.netnod.se", | ||
| "time.txryan.com", | ||
| "ntpmon.dcs1.biz", | ||
| } | ||
|
|
||
| // Shuffle the servers to avoid always querying the same servers. | ||
| for i := range servers { | ||
| j := rand.Intn(i + 1) | ||
| servers[i], servers[j] = servers[j], servers[i] | ||
| } | ||
|
|
||
| numToQuery := 3 | ||
| queried := 0 | ||
| sumOffset := time.Duration(0) | ||
| retTime := time.Unix(0, 0) | ||
|
|
||
| for _, server := range servers { | ||
| ke, err := ntske.Connect(server, tlsconfig, false) | ||
| if err != nil { | ||
| log.Printf("Failed to connect to %v: %v\n", server, err) | ||
| continue | ||
| } | ||
|
|
||
| err = ke.Exchange() | ||
| if err != nil { | ||
| log.Printf("Key exchange failed for %v: %v\n", server, err) | ||
| continue | ||
| } | ||
|
|
||
| if len(ke.Meta.Cookie) == 0 { | ||
| log.Printf("No Cookies from %v: %v\n", server, err) | ||
| continue | ||
| } | ||
|
|
||
| if ke.Meta.Algo != ntske.AES_SIV_CMAC_256 { | ||
| log.Printf("Algorithm mismatch for %v: %v\n", server, err) | ||
| continue | ||
| } | ||
|
|
||
| err = ke.ExportKeys() | ||
| if err != nil { | ||
| log.Printf("Failed to export keys from %v: %v\n", server, err) | ||
| continue | ||
| } | ||
|
|
||
| var opt ntp.QueryOptions | ||
| opt.Port = int(ke.Meta.Port) | ||
| opt.NTS = true | ||
| opt.C2s = ke.Meta.C2sKey | ||
| opt.S2c = ke.Meta.S2cKey | ||
| opt.Cookie = ke.Meta.Cookie[0] | ||
| opt.Debug = false | ||
|
|
||
| resp, err := ntp.QueryWithOptions(ke.Meta.Server, opt) | ||
| if err != nil { | ||
| log.Printf("Failed query NTP for %v: %v\n", server, err) | ||
| continue | ||
| } | ||
|
|
||
| err = resp.Validate() | ||
| if err != nil { | ||
| log.Printf("Failed to validate NTP response for %v: %v\n", server, err) | ||
| continue | ||
| } | ||
|
|
||
| sumOffset += resp.ClockOffset.Abs() | ||
|
|
||
| queried++ | ||
| if queried >= numToQuery { | ||
| retTime = resp.Time | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if queried < numToQuery { | ||
| return retTime, fmt.Errorf("failed to query enough servers") | ||
| } | ||
|
|
||
| if sumOffset > time.Minute { | ||
| return retTime, fmt.Errorf("queried time fluctuates too much") | ||
| } | ||
|
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||
| return retTime, nil | ||
| } |