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<h3>
Hal Murray pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/7630ba8b9e69c6a36ba8a17597364a9d8b4f103a">7630ba8b</a></strong>
<div>
<span>by Richard Laager</span>
<i>at 2019-01-19T08:28:55Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NTS updates
This makes a hwole bunch of changes. Some are stylistic, some make
terminology more consistent, some fix mistakes, and some specify
configuration parameters.
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/ff39505078c92d58857bdd949570dc455f6cd3b2">ff395050</a></strong>
<div>
<span>by Richard Laager</span>
<i>at 2019-01-19T09:04:50Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add more NTS configuration details
We need a cipher string for the TLS connection too. Also, the client
needs several settings that I had only listed for the server.
</pre>
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<h4>1 changed file:</h4>
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<a href="#609c2c0b1eb27fef7a1a180c7fd078d2c4033c62">
devel/nts.adoc
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<h4>Changes:</h4>
<li id="609c2c0b1eb27fef7a1a180c7fd078d2c4033c62">
<a href="https://gitlab.com/NTPsec/ntpsec/compare/52ef9b623629f3f337c1044657539ff2406b7921...ff39505078c92d58857bdd949570dc455f6cd3b2#609c2c0b1eb27fef7a1a180c7fd078d2c4033c62"><strong>devel/nts.adoc</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -16,15 +16,24 @@ The NTS implementation shall:</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">== General Ideas ==</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext">The NTP server maintains no per-client state. The NTP client</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext">stores the state in a cookie which is sent with each request.</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext">The cookie is provided by the NTS-KE server. The NTP server will</span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext">decrypt it to recover the session keys.</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext">The NTP server maintains no per-client state. The NTS-KE server</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">initially generates the state and wraps it into an</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">implementation-defined cookie. Multiple copies of this plaintext</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">cookie are encrypted with nonces and provided to the client by the</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">NTS-KE server. The client treats the cookies as opaque data and</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">echos them back to the NTP server with each request. The NTP</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">server decrypts the cookie to retrieve the state, which includes</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">the encryption parameters (AEAD algorithm and keys). To issue a</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext">new cookie, the NTP server encrypts (to itself) the same plaintext</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">cookie with a new nonce.</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">NTS should avoid exposing information that would be useful in</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">tracking the client. (Consider a laptop that moves from home</span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">to work to a coffee shop.) Thus cookies should only used once.</span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext">To implement that, each NTP response includes a new encrypted cookie.</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">To implement that, each NTP response includes a new cookie, which is</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">encrypted when sent to the client. (Otherwise, the cookie could be</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext">observed in transit, which would allow for tracking the client when</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext">it later echos the cookie back to the server.)</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext">NTS should not assist DDoS amplification. All NTP responses</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext">are the same length as the request. This means that some</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -36,7 +45,7 @@ will replace them.</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">This picture is for discussion. In actual packaging Alpha and Bravo</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">will both be inside ntpd. Charlie and Delta, on the other hand, need</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">to be separate because Delta will have its own public port serving</span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext">requests from Bravo.Also, potentially, one Delta (or Delta/Echo</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">requests from Bravo.<span class="idiff left right"> </span>Also, potentially, one Delta (or Delta/Echo</span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">combination) could serve multiple Charlies, e.g. in a data-center</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">deployment.</span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -49,9 +58,9 @@ deployment.</td>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"> ; |NTS-KE client|-^---------->|NTS-KE server|</span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext"> ; +-------------+ ; +-------------+</span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext"> ; ^ ; |</span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="plaintext"> ; | ; <span class="idiff left right">.----.</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="plaintext"> ; | ; <span class="idiff left right">|Echo</span>|</span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="plaintext"> ; | ; <span class="idiff left right">.----.</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext"> ; | ; <span class="idiff left right"> |</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext"> ; | ; <span class="idiff left right"> </span>|</span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext"> ; | ; <span class="idiff left right"> |</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"> ; | ; |</span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext"> ; +-----------+ ; +-----------+</span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext"> ; |Alpha | ; |Charlie |</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -66,9 +75,11 @@ is used for one request/response transaction.</td>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext">=== Alpha -> Bravo ===</span>
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69
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="plaintext">NTP-client to NTS-KE-client (Alpha to Bravo) is pretty simple.</span>
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78
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="plaintext">NTP client to NTS-KE client (Alpha to Bravo) is pretty simple.</span>
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79
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="plaintext">As these will both be inside ntpd, this will be function calling,</span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext">not a network connection.</span>
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70
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="plaintext"> NTS-KE<span class="idiff left right">-</span>client sends:</span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="plaintext"> NTS-KE<span class="idiff left right"> </span>client sends:</span>
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72
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext"> Host name of NTS-KE server</span>
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73
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="plaintext"> Optional preferred IP Address 4.1.7</span>
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74
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="plaintext"> A sorted list of AEAD algorithms 4.1.5</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -79,35 +90,89 @@ NTP-client to NTS-KE-client (Alpha to Bravo) is pretty simple.</td>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="plaintext"> The selected AEAD algorithm 4.1.5</span>
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80
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext"></span>
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81
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">For AEAD, we need libaes_siv.so, RFC 5297</span>
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82
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="plaintext">It's available, but not in OpenSSL yet</span>
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93
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="plaintext">It's available, but not in OpenSSL yet<span class="idiff left right">.</span></span>
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94
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC84" class="line" lang="plaintext">=== Bravo -> Delta ===</span>
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85
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<pre style="margin: 0;">-<span id="LC85" class="line" lang="plaintext">NTS-client-NTS-server (Bravo to Delta) is mostly the above in TLS over TCP.</span>
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86
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="plaintext">NTS-client has to make the C2S and S2C keys. They are tangled up</span>
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87
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="plaintext">with TLS.</span>
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95
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext">TODO: Is the NTP client going to initiate NTS for servers by default?</span>
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96
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext">If so, it SHOULD (MUST?) provide a configuration parameter to disable</span>
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97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext">NTS for a given server.</span>
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88
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98
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="plaintext"></span>
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89
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<pre style="margin: 0;">-<span id="LC89" class="line" lang="plaintext">=== Echo -> Charlie & Delta ===</span>
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90
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="plaintext">In this mode, the NTS server generates the cookies, and thus</span>
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91
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<pre style="margin: 0;">-<span id="LC91" class="line" lang="plaintext">must know the master key and the cookie generation recipe.</span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext">While it is technically permitted (see RFC5280, page 35) to put an</span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext">IP address in a subjectAltName in a certificate, this is essentially</span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="plaintext">never done in practice, and certainly not with public CAs.</span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="plaintext">Accordingly, the NTP client SHOULD NOT initiate NTS for servers</span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="plaintext">specified by IP address (whether IPv4 or IPv6).</span>
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92
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="plaintext"></span>
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93
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="plaintext">Echo to the servers Charlie and Delta is a one shot.</span>
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94
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="plaintext">Echo sends a seed/ratchet mechanism number pair to both servers.</span>
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95
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="plaintext">optionally a rotation time and cookie format number could be sent.</span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="plaintext">Additionally, the NTP client SHOULD NOT initiate NTS for pool</span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext">associations by default. The most common pool is the public pool at</span>
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107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="plaintext">pool.ntp.org. The volunteer NTP servers will never be able to pass a</span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="plaintext">certificate check for <anything>.pool.ntp.org, so NTS-KE will always</span>
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109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="plaintext">fail, and represents useless load on the public pool servers. As the</span>
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110
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="plaintext">pool statement can be used in other configurations that could work</span>
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111
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext">with NTS-KE, the NTP client SHOULD allow NTS to be enabled on pool</span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="plaintext">associations.</span>
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96
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113
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="plaintext"></span>
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97
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="plaintext">=== Or... dump the Echo box</span>
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98
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="plaintext">In this mode, the NTS-server doesn't know the master key</span>
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99
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="plaintext">or the cookie format.</span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext">The NTS-KE client SHOULD provide a configuration parameter to</span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext">configure the root CAs used to validate TLS certificates.</span>
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100
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116
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="plaintext"></span>
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101
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="plaintext">NTS-server to NTP-server</span>
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102
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="plaintext"> NTS-Server sends:</span>
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103
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="plaintext"> C2S and S2C encryption keys 4.2, 5.1</span>
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104
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="plaintext"> A sorted list of AEAD algorithms 4.1.5</span>
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105
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="plaintext"> It gets back:</span>
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106
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="plaintext"> The selected AEAD algorithm 4.1.5</span>
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107
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<pre style="margin: 0;">-<span id="LC107" class="line" lang="plaintext"> 1 to 8 cookies 4.1.6</span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext">The NTS-KE client SHOULD have a configuration parameter to specify</span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext">which TLS protocols are permissible. Regardless of what is</span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="plaintext">configured, because the NTS specification relies on RFC 5705, and</span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext">also because it explicitly says so, TLS 1.3 is the minimum TLS</span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext">version allowed.</span>
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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext"></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext">The NTS-KE client SHOULD provide a configuration paramter to</span>
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124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="plaintext">configure an OpenSSL cipher string for the TLS connection.</span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="plaintext"></span>
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126
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="plaintext">The NTS-KE client SHOULD provide a configuration paramter to</span>
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127
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="plaintext">configure an OpenSSL cipher string for the AEAD algorithms.</span>
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128
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="plaintext"></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="plaintext">The NTP client SHOULD provide a mechanism for the administrator to</span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="plaintext">see whether NTS is currently in use on a given server association.</span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="plaintext"></span>
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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="plaintext">=== Bravo -> Delta ===</span>
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133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="plaintext">The NTS-KE client to NTS-KE server (Bravo to Delta) communication is</span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="plaintext">mostly the above in TLS 1.3 (or later) over TCP in the format</span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="plaintext">specified in the NTS draft.</span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="plaintext"></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext">The NTS-KE client (Bravo) and NTS-KE server (Delta) independently</span>
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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="plaintext">derive the C2S and S2C keys. For OpenSSL, this is implemented by</span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext">making two calls to SSL_export_keying_material(), which implements</span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext">RFC5705. The label and context inputs are provided in 5.1. This</span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext">process is deterministic, so both ends generate the same C2S and S2C.</span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext"></span>
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143
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext">The NTS-KE server SHOULD have a configuration parameter to specify</span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="plaintext">the TLS key, certificate, and intermediate certificate bundles.</span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="plaintext"></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="plaintext">The NTS-KE server MAY have a method to reload the key, certificate,</span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext">and intermediate certificate bundles without a full daemon restart.</span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext"></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="plaintext">The NTS-KE server SHOULD have a configuration parameter to specify</span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="plaintext">which TLS protocols are permissible. Regardless of what is</span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="plaintext">configured, because the NTS specification relies on RFC 5705, and</span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="plaintext">also because it explicitly says so, TLS 1.3 is the minimum TLS</span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="plaintext">version allowed.</span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="plaintext"></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="plaintext">The NTS-KE server SHOULD provide a configuration paramter to</span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="plaintext">configure an OpenSSL cipher string for the TLS connection.</span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="plaintext"></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="plaintext">The NTS-KE server SHOULD provide a configuration paramter to</span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="plaintext">configure an OpenSSL cipher string for the AEAD algorithms.</span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="plaintext"></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="plaintext">By default, the NTS-KE server SHOULD honor the client's AEAD</span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="plaintext">algorithm ordering; that is, the NTS-KE server SHALL by default</span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="plaintext">choose the first of the client's AEAD algorithms that the server</span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="plaintext">also supports (after limiting by the server's configured cipher</span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext">string). However, the server SHOULD have a configuration parameter to</span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="plaintext">honor its cipher order which reverses this behavior, choosing the</span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="plaintext">first from the server's sorted list of algorithms that is also</span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="plaintext">supported by the client.</span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="plaintext"></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="plaintext">The NTS-KE server then generates and returns 8 cookies using, for</span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext">example, the suggested format in section 6 of the NTS draft. To do</span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="plaintext">so, the NTS-KE server needs a master key, called "K" in the draft.</span>
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108
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173
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="plaintext"></span>
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109
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="plaintext">=== Alpha -> Charlie ===</span>
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110
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="plaintext">NTP<span class="idiff left right">-client to NTP-</span>server (Alpha to Charlie)</span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="plaintext">NTP<span class="idiff left right"> client to NTP </span>server (Alpha to Charlie)</span>
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111
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176
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="plaintext"></span>
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112
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="plaintext">If all goes well (no lost packets) the client sends:</span>
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113
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="plaintext"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="183" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -118,9 +183,8 @@ If all goes well (no lost packets) the client sends:</td>
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118
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183
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="plaintext"> </span>
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119
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184
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="plaintext">It gets back the same, with the cookie replaced with a new cookie</span>
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120
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185
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">and S2C used for authentication.</span>
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121
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<pre style="margin: 0;">-<span id="LC121" class="line" lang="plaintext">New cookies are encrypted with S2C. Pg 20</span>
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122
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="plaintext">The response is the same lengh. The cookie is moved from</span>
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123
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="plaintext">unencrypted to encrypted.</span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="plaintext"></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="plaintext">The response is the same lengh.</span>
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124
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188
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="plaintext"></span>
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125
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="plaintext">All the extra data is in real NTP extensions. (No more of</span>
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126
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="plaintext">the magic length kludgery for the current shared key authentication.)</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="138" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="202" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -138,35 +202,43 @@ I think we need a nonce in there.</td>
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138
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202
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="plaintext"></span>
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139
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203
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="plaintext">NTS makes use of three keys:</span>
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140
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204
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="plaintext"></span>
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141
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="plaintext">* Client to Server (c2s)</span>
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205
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="plaintext">* Client to Server key (C2S)</span>
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206
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="plaintext"></span>
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207
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="plaintext">* Server to Client key (S2C)</span>
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142
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208
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="plaintext"></span>
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143
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="plaintext">* <span class="idiff left right">Server to Client (s2c</span>)</span>
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209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="plaintext">* <span class="idiff left right">NTS Master Key (called K in the NTS draft</span>)</span>
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144
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210
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="plaintext"></span>
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145
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<pre style="margin: 0;">-<span id="LC145" class="line" lang="plaintext">* NTS Master Key</span>
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211
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="plaintext">Because one of the goals of NTS is to not require any per-client</span>
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212
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="plaintext">state in the servers, the servers (both NTP and NTS-KE) do not</span>
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213
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="plaintext">store either of C2S/S2C. Both servers possess the NTS Master Key,</span>
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214
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="plaintext">which is expected to be updated somewhat regularly, with old versions</span>
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215
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="plaintext">being kept for some time (SHOULD be two rotation cycles) to allow for</span>
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216
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="plaintext">old cookies to be decrypted.</span>
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146
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217
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="plaintext"></span>
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147
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="plaintext"><span class="idiff left right">Because one of the goals of NTS is to not require any per-client state i</span>n</span>
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148
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="plaintext">the <span class="idiff left right">servers, the server (both NTPD and NTS-KE) does not possess either of the</span></span>
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149
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="plaintext"><span class="idiff left right">c2s/s2c pair. Both servers possess the NTS Master Key, which is expected to</span></span>
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150
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="plaintext"><span class="idiff left right">be updated somewhat regularly</span>.</span>
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218
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="plaintext"><span class="idiff left right">The C2S and S2C keys are derived from the TLS session data betwee</span>n</span>
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219
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="plaintext">the <span class="idiff left right">NTS-KE client and the NTS-KE server using the RFC5705 algorithm.</span></span>
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220
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="plaintext"><span class="idiff left right">These are not the same as the keys used by TLS to protect the data</span></span>
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221
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="plaintext"><span class="idiff left right">flowing over the TLS connection itself</span>.</span>
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151
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222
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="plaintext"></span>
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152
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="plaintext"><span class="idiff left right">The c2s/s2c pair is created during the TLS handshake between client and NTS-KE.</span></span>
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153
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="plaintext"><span class="idiff left right">As part of this NTS-KE will create a variable number of cookies (should be 8).</span></span>
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154
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<pre style="margin: 0;">-<span id="LC154" class="line" lang="plaintext"><span class="idiff left right">These cookies are encrypted with the NTS master key, and are opaque to the</span></span>
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155
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="plaintext"><span class="idiff left right">client. The cookies contain the c2s/s2c pair in a form that NTPD will</span></span>
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156
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="plaintext"><span class="idiff left right">understand, and is how NTPD is able to en/decrypt data without needing to</span></span>
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157
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="plaintext"><span class="idiff left right">store per-client </span>keys.</span>
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223
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="plaintext"><span class="idiff left right">As part of the setup, NTS-KE will create a variable number of cookies</span></span>
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224
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="plaintext"><span class="idiff left right">(which SHOULD be 8). These cookies are encrypted with the NTS Master</span></span>
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225
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="plaintext"><span class="idiff left right">Key, and are opaque to the client. The cookies contain C2S and S2C in</span></span>
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226
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="plaintext"><span class="idiff left right">a form that the NTP server will understand, and this is how the NTP</span></span>
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227
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="plaintext"><span class="idiff left right">server is able to en/decrypt data without needing to store per-client</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="plaintext">keys.</span>
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158
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229
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<pre style="margin: 0;"> <span id="LC229" class="line" lang="plaintext"></span>
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159
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="plaintext">When sending an NTS packet the client attaches a cookie-blob in cleartext,</span>
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160
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="plaintext">then encrypts the rest of the data using the c2s key. When the NTPD server</span>
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161
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="plaintext">receives the packet it decrypts the cookie-blob using its Master Key, and</span>
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162
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="plaintext">extracts the c2s/s2c pair so it can decrypt the rest. The response packet</span>
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163
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="plaintext">is encrypted using the s2c key extracted from the cookie.</span>
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230
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="plaintext">When sending an NTP packet, the client attaches a cookie blob in</span>
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231
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="plaintext">cleartext, then encrypts the rest of the data using the C2S key. When</span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="plaintext">the NTP server receives the packet, it decrypts the cookie using its</span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="plaintext">NTS Master Key, and extracts C2S and S2C. It uses C2S to decrypt the</span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="plaintext">rest. The response packet is encrypted using the S2C extracted from the</span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="plaintext">cookie.</span>
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164
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="plaintext"></span>
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165
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="plaintext">== Odds and ends ==</span>
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166
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="plaintext"></span>
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167
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="plaintext">How many cookies should the NTP client try to hold? 8</span>
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168
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240
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="plaintext"></span>
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169
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="plaintext">There is no hard reason, but it is what the server SHOULD return. 4.1.6</span>
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241
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="plaintext">There is no hard reason, but it is what the <span class="idiff left right">NTS-KE </span>server SHOULD return. 4.1.6</span>
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170
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242
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="plaintext">It also matches the number of samples that ntpd remembers (the reach bit</span>
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171
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243
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="plaintext">mask in ntpq/peers) and running out of responses is a good time to do</span>
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172
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="plaintext">special things like get a new pool server or get new cookies by running</span>
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