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<i class="far fa-calendar-alt"></i>&nbsp;<span title="Création" style="color:#FF00FF">25&nbsp;déc.&nbsp;&nbsp;2019</span>
<span title="Modification" style="color:#00FF7F">23&nbsp;nov.&nbsp;&nbsp;2018</span></li></ul></div><meta itemprop="datePublished" content="2018-11-23T00:00:00+01:00">
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</details><h1 id="2017-04-30-openssh-debian-configuration">2017-04-30-openssh-debian-configuration</h1>
<p><a href="https://buzut.fr/configuration-dun-serveur-linux-ssh/">Installer, configurer et sécuriser le serveur ssh</a></p>
<h2 id="configurer-ssh">Configurer SSH</h2>
<p>Pour paramétrer SSH, rendez-vous dans son fichier de configuration :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>nano /etc/ssh/sshd_config
</code></pre></div></div>
<p>Chiffrement et intégrité</p>
<p>SSH utilise trois types d’algos différents :</p>
<ul>
<li>chiffrement asymétrique pour l’échange des clefs, à partir duquel le client et le serveur se mettent d’accord sur une clef pour du chiffrement symétrique,</li>
<li>chiffrement symétrique qui servira à chiffrer l’ensemble des données de la session. C’est plus rapide que l’asymétrique, mais il faut une clef partagée, donc on utilise tout d’abord pour cela l’asymétrique,</li>
<li>du hashage afin de s’assurer de l’intégrité des données.</li>
</ul>
<p>Pour une explication un peu plus en détails du fonctionnement de SSH, vous pouvez lire cet article [en] de DigitalOcean.</p>
<p>OpenSSH, lister les algos pris en charge par votre serveur avec les commandes suivantes – respectivement pour l’asymétrique, le symétrique et le hashage :</p>
<p>Debian Jessie (OpenSSH 6.7p1-5+deb8u3)</p>
<p>l’asymétrique</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ssh -Q kex
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521
diffie-hellman-group1-sha1
curve25519-sha256@libssh.org
</code></pre></div></div>
<p>le symétrique</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ssh -Q cipher
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>3des-cbc
blowfish-cbc
cast128-cbc
arcfour
arcfour128
arcfour256
aes128-cbc
aes192-cbc
aes256-cbc
rijndael-cbc@lysator.liu.se
aes128-ctr
aes192-ctr
aes256-ctr
aes128-gcm@openssh.com
aes256-gcm@openssh.com
chacha20-poly1305@openssh.com
</code></pre></div></div>
<p>le hashage</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ssh -Q mac
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>hmac-sha1
hmac-sha1-96
hmac-sha2-256
hmac-sha2-512
hmac-md5
hmac-md5-96
hmac-ripemd160
hmac-ripemd160@openssh.com
umac-64@openssh.com
umac-128@openssh.com
hmac-sha1-etm@openssh.com
hmac-sha1-96-etm@openssh.com
hmac-sha2-256-etm@openssh.com
hmac-sha2-512-etm@openssh.com
hmac-md5-etm@openssh.com
hmac-md5-96-etm@openssh.com
hmac-ripemd160-etm@openssh.com
umac-64-etm@openssh.com
umac-128-etm@openssh.com
</code></pre></div></div>
<p><strong>Le premier algo dans l’ordre de la liste supporté par le client et le serveur sera celui utilisé.</strong> <br />
Si nous voulons modifier ces listes d’algorithmes, il faut les préciser dans le fichier de <strong>conf</strong>.<br />
Pour une config axée sécurité, au détriment de la compatibilité avec de plus vieux clients ssh – hors cas spéciaux avec de vieilles ditrib RHEL ou CentOS, nos machines d’admin sont généralement plutôt équipées de clients modernes.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code># notez qu'il suffit de séparer les noms par une virgule pour autoriser plusieurs algos
KexAlgorithms curve25519-sha256@libssh.org
Ciphers chacha20-poly1305@openssh.com
MACs umac-128-etm@openssh.com
</code></pre></div></div>
<h2 id="authentification">Authentification</h2>
<p>Au delà de ces trois algorithmes, la question qui fait grand débat est celle concernant l’authentification par clef. Plusieurs algorithmes s’affrontent ici de nouveau, vous pouvez les lister :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ssh -Q key
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ssh-ed25519
ssh-ed25519-cert-v01@openssh.com
ssh-rsa
ssh-dss
ecdsa-sha2-nistp256
ecdsa-sha2-nistp384
ecdsa-sha2-nistp521
ssh-rsa-cert-v01@openssh.com
ssh-dss-cert-v01@openssh.com
ecdsa-sha2-nistp256-cert-v01@openssh.com
ecdsa-sha2-nistp384-cert-v01@openssh.com
ecdsa-sha2-nistp521-cert-v01@openssh.com
ssh-rsa-cert-v00@openssh.com
ssh-dss-cert-v00@openssh.com
</code></pre></div></div>
<p>Me concernant, dans la droite ligne de ce que nous avons spécifié pour <strong>KexAlgorithms</strong>, j’ai délaissé RSA (DSA n’est même plus supporté à partir d’openSSH 7.0) au profit de <strong>EdDSA</strong>, dont les clefs sont plus courtes.</p>
<p>Avec les attaques par bruteforce, les mots de passe deviennent plus vulnérables, et pour palier à cela, il faut en retenir de plus en plus compliqués. On peut cependant interdire toute connexion par mot de passe en substituant le mot de passe par un certificat. La machine cliente génère un certificat, que l’on enregistre sur le serveur. Dès lors, il n’y aura plus de mot de passe à taper ! Ce qui ne nous empêche pas de <a href="https://buzut.fr/installer-et-parametrer-fail2ban/">restreindre le nombre de tentatives de connexion(fail2ban)</a>…</p>
<p>Mettre en place une clef ssh de type <strong>EdDSA</strong> ainsi que la connexion automatique sans mot de passe.<br />
Générer une clé côté client</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ssh-keygen -t ed25519 -f ssh_host_ed25519
</code></pre></div></div>
<p>Modifier le fichier de configuration <strong>/etc/ssh/sshd_config</strong></p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>PermitRootLogin no
PubkeyAuthentication yes
AuthorizedKeysFile %h/.ssh/authorized_keys
PasswordAuthentication no
ChallengeResponseAuthentication yes
PermitEmptyPasswords no
</code></pre></div></div>
<p>Pour en revenir au support des clefs, je commente donc tous les protocoles sauf ed25519 :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code># HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
</code></pre></div></div>
<p>Pour encore plus de sécurité, vous pouvez limiter les adresses IP qui auront le droit de se connecter au serveur, mais dans ce cas, il faudra vous connecter toujours du même endroit (ou alors passer par votre proxy ou VPN avec toujours la même IP). Remplacez pour cela 0.0.0.0 par l’IP en question et décommenter la ligne en enlevant le dièse.</p>
<p>Vous pouvez également décommenter l’une ou l’autre des deux lignes en laissant 0.0.0.0 ou :: pour faire en sorte que ssh ne soit joignable qu’en ipv4 ou qu’en ipv6.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code># Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
</code></pre></div></div>
<p>Vous pouvez aussi spécifier les utilisateurs que vous autorisez à se connecter. Ainsi, tout autre utilisateur sera dans l’impossibilité de se connecter via ssh. Pour ce faire, il faut rajouter la directive <strong>AllowUsers</strong> suivie des noms d’utilisateurs à qui vous souhaitez accorder l’autorisation de se connecter en ssh :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>AllowUsers login login2 login3 etc
</code></pre></div></div>
<p>Enfin, je vous conseille aussi de désactiver la possibilité de se connecter en tant que root (l’utilisateur qui a tous les droits). Il est préférable de se connecter avec un utilisateur ayant des droits plus restreints et d’utiliser sudo lorsque les opérations nécessitent d’être root.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code># Authentication:
LoginGraceTime 120
PermitRootLogin no
StrictModes yes
</code></pre></div></div>
<blockquote>
<p>les valeurs ci-dessus sont celles par défaut sur une installation debian</p>
</blockquote>
<p><strong>LoginGraceTime</strong> concerne le temps pendant lequel le serveur ssh attend que l’utilisateur s’authentifie, au delà de ce laps de temps, il va clore la connexion. Vous pouvez spécifier le temps que vous voulez, sachant qu’il est par défaut à 2 minutes (120 secondes).</p>
<h2 id="désactiver-linutile">Désactiver l’inutile</h2>
<p>Comme souvent, ce qui n’est pas utilisé augmente la surface d’attaque potentielle. Donc si on ne s’en sert pas, autant s’en passer. On peut désactiver <strong>X11Forwarding</strong> et <strong>AllowAgentForwarding</strong> pour respectivement le serveur graphique x11 et le ssh forwarding.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>X11Forwarding no
AllowAgentForwarding no
</code></pre></div></div>
<p>C’est tout pour la configuration de ssh. Il va maintenant falloir redémarrer le serveur ssh pour que les modifications prennent effet.</p>
<p>service ssh restart</p>
<p>Enfin, pour vous connecter à votre serveur depuis un autre ordinateur, n’oubliez pas de préciser le port (avec -p que vous avez choisi si vous n’avez pas laissé celui par défaut).</p>
<h2 id="tcpkeepalive">TCPKeepAlive</h2>
<p>Lorsqu’on est connecté en ssh à un ordinateur distant et qu’on laisse la connexion inactive pendant un certain temps, il arrive que l’on soit déconnecté. On se retrouve alors avec un message du style :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>Read from remote host distant.tld: Connection reset by peer Connection to distant.tld closed.
</code></pre></div></div>
<p>Deux approches de contournement</p>
<h3 id="a-serveur">A-Serveur</h3>
<p>Si vous avez un accès administrateur au serveur, il est possible de configurer <strong>ClientAliveInterval</strong> et <strong>ClientAliveCountMax</strong>.</p>
<p>Il existe bien un paramètre <strong>TCPKeepAlive</strong>, mais il fonctionne sur la couche transport et non sur la couche applicative. C’est donc un petit peu moins fiable, on préférera le désactiver au profit de <strong>ClientAliveInterval</strong> ou <strong>ClientAliveCountMax</strong>.</p>
<ul>
<li><strong>ClientAliveInterval</strong> envoie un message au client ssh après x secondes sans activité (0 = jamais). Si le client répond au serveur, la connexion est maintenue.</li>
<li><strong>ClientAliveCountMax</strong> quant à lui, concerne le nombre maximal de requêtes ClientAliveInterval sans réponse que tolérera le serveur avant de fermer la connexion.</li>
</ul>
<p>Ajouter les lignes suivantes au fichier <strong>/etc/ssh/sshd_config</strong> :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ClientAliveInterval 600
ClientAliveCountMax 0
</code></pre></div></div>
<p>modidier la ligne (passage à no)</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>TCPKeepAlive no
</code></pre></div></div>
<p>On redémarre ensuite le serveur</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>service ssh restart.
</code></pre></div></div>
<h3 id="b-client">B-Client</h3>
<p>Cette solution est très pratique si l’on a pas un accès root à la machine. Il va s’agir d’utiliser la directive <strong>ServerAliveInterval</strong>. Cette dernière va faire en sorte que le client envoie toutes les x secondes une requête au serveur ssh pour lui signaler qu’il est toujours en vie. Ainsi, on évite la déconnexion par timeout. <br />
Ouvrir le fichier de configuration ssh client <strong>/etc/ssh/ssh_config</strong> et y ajouter la ligne suivante :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ServerAliveInterval 120
</code></pre></div></div>
<p>Votre ssh ne devrait désormais plus se couper</p>
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return false;
}
return true;
}
var _$fuzzysearch_1 = fuzzysearch;
'use strict'
/* removed: const _$fuzzysearch_1 = require('fuzzysearch') */;
var _$FuzzySearchStrategy_5 = new FuzzySearchStrategy()
function FuzzySearchStrategy () {
this.matches = function (string, crit) {
return _$fuzzysearch_1(crit.toLowerCase(), string.toLowerCase())
}
}
'use strict'
var _$LiteralSearchStrategy_6 = new LiteralSearchStrategy()
function LiteralSearchStrategy () {
this.matches = function (str, crit) {
if (!str) return false
str = str.trim().toLowerCase()
crit = crit.trim().toLowerCase()
return crit.split(' ').filter(function (word) {
return str.indexOf(word) >= 0
}).length === crit.split(' ').length
}
}
'use strict'
var _$Repository_4 = {
put: put,
clear: clear,
search: search,
setOptions: __setOptions_4
}
/* removed: const _$FuzzySearchStrategy_5 = require('./SearchStrategies/FuzzySearchStrategy') */;
/* removed: const _$LiteralSearchStrategy_6 = require('./SearchStrategies/LiteralSearchStrategy') */;
function NoSort () {
return 0
}
const data = []
let opt = {}
opt.fuzzy = false
opt.limit = 10
opt.searchStrategy = opt.fuzzy ? _$FuzzySearchStrategy_5 : _$LiteralSearchStrategy_6
opt.sort = NoSort
opt.exclude = []
function put (data) {
if (isObject(data)) {
return addObject(data)
}
if (isArray(data)) {
return addArray(data)
}
return undefined
}
function clear () {
data.length = 0
return data
}
function isObject (obj) {
return Boolean(obj) && Object.prototype.toString.call(obj) === '[object Object]'
}
function isArray (obj) {
return Boolean(obj) && Object.prototype.toString.call(obj) === '[object Array]'
}
function addObject (_data) {
data.push(_data)
return data
}
function addArray (_data) {
const added = []
clear()
for (let i = 0, len = _data.length; i < len; i++) {
if (isObject(_data[i])) {
added.push(addObject(_data[i]))
}
}
return added
}
function search (crit) {
if (!crit) {
return []
}
return findMatches(data, crit, opt.searchStrategy, opt).sort(opt.sort)
}
function __setOptions_4 (_opt) {
opt = _opt || {}
opt.fuzzy = _opt.fuzzy || false
opt.limit = _opt.limit || 10
opt.searchStrategy = _opt.fuzzy ? _$FuzzySearchStrategy_5 : _$LiteralSearchStrategy_6
opt.sort = _opt.sort || NoSort
opt.exclude = _opt.exclude || []
}
function findMatches (data, crit, strategy, opt) {
const matches = []
for (let i = 0; i < data.length && matches.length < opt.limit; i++) {
const match = findMatchesInObject(data[i], crit, strategy, opt)
if (match) {
matches.push(match)
}
}
return matches
}
function findMatchesInObject (obj, crit, strategy, opt) {
for (const key in obj) {
if (!isExcluded(obj[key], opt.exclude) && strategy.matches(obj[key], crit)) {
return obj
}
}
}
function isExcluded (term, excludedTerms) {
for (let i = 0, len = excludedTerms.length; i < len; i++) {
const excludedTerm = excludedTerms[i]
if (new RegExp(excludedTerm).test(term)) {
return true
}
}
return false
}
/* globals ActiveXObject:false */
'use strict'
var _$JSONLoader_2 = {
load: load
}
function load (location, callback) {
const xhr = getXHR()
xhr.open('GET', location, true)
xhr.onreadystatechange = createStateChangeListener(xhr, callback)
xhr.send()
}
function createStateChangeListener (xhr, callback) {
return function () {
if (xhr.readyState === 4 && xhr.status === 200) {
try {
callback(null, JSON.parse(xhr.responseText))
} catch (err) {
callback(err, null)
}
}
}
}
function getXHR () {
return window.XMLHttpRequest ? new window.XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP')
}
'use strict'
var _$OptionsValidator_3 = function OptionsValidator (params) {
if (!validateParams(params)) {
throw new Error('-- OptionsValidator: required options missing')
}
if (!(this instanceof OptionsValidator)) {
return new OptionsValidator(params)
}
const requiredOptions = params.required
this.getRequiredOptions = function () {
return requiredOptions
}
this.validate = function (parameters) {
const errors = []
requiredOptions.forEach(function (requiredOptionName) {
if (typeof parameters[requiredOptionName] === 'undefined') {
errors.push(requiredOptionName)
}
})
return errors
}
function validateParams (params) {
if (!params) {
return false
}
return typeof params.required !== 'undefined' && params.required instanceof Array
}
}
'use strict'
var _$utils_9 = {
merge: merge,
isJSON: isJSON
}
function merge (defaultParams, mergeParams) {
const mergedOptions = {}
for (const option in defaultParams) {
mergedOptions[option] = defaultParams[option]
if (typeof mergeParams[option] !== 'undefined') {
mergedOptions[option] = mergeParams[option]
}
}
return mergedOptions
}
function isJSON (json) {
try {
if (json instanceof Object && JSON.parse(JSON.stringify(json))) {
return true
}
return false
} catch (err) {
return false
}
}
var _$src_8 = {};
(function (window) {
'use strict'
let options = {
searchInput: null,
resultsContainer: null,
json: [],
success: Function.prototype,
searchResultTemplate: '<li><a href="{url}" title="{desc}">{title}</a></li>',
templateMiddleware: Function.prototype,
sortMiddleware: function () {
return 0
},
noResultsText: 'No results found',
limit: 10,
fuzzy: false,
debounceTime: null,
exclude: []
}
let debounceTimerHandle
const debounce = function (func, delayMillis) {
if (delayMillis) {
clearTimeout(debounceTimerHandle)
debounceTimerHandle = setTimeout(func, delayMillis)
} else {
func.call()
}
}
const requiredOptions = ['searchInput', 'resultsContainer', 'json']
/* removed: const _$Templater_7 = require('./Templater') */;
/* removed: const _$Repository_4 = require('./Repository') */;
/* removed: const _$JSONLoader_2 = require('./JSONLoader') */;
const optionsValidator = _$OptionsValidator_3({
required: requiredOptions
})
/* removed: const _$utils_9 = require('./utils') */;
window.SimpleJekyllSearch = function (_options) {
const errors = optionsValidator.validate(_options)
if (errors.length > 0) {
throwError('You must specify the following required options: ' + requiredOptions)
}
options = _$utils_9.merge(options, _options)
_$Templater_7.setOptions({
template: options.searchResultTemplate,
middleware: options.templateMiddleware
})
_$Repository_4.setOptions({
fuzzy: options.fuzzy,
limit: options.limit,
sort: options.sortMiddleware,
exclude: options.exclude
})
if (_$utils_9.isJSON(options.json)) {
initWithJSON(options.json)
} else {
initWithURL(options.json)
}
const rv = {
search: search
}
typeof options.success === 'function' && options.success.call(rv)
return rv
}
function initWithJSON (json) {
_$Repository_4.put(json)
registerInput()
}
function initWithURL (url) {
_$JSONLoader_2.load(url, function (err, json) {
if (err) {
throwError('failed to get JSON (' + url + ')')
}
initWithJSON(json)
})
}
function emptyResultsContainer () {
options.resultsContainer.innerHTML = ''
}
function appendToResultsContainer (text) {
options.resultsContainer.innerHTML += text
}
function registerInput () {
options.searchInput.addEventListener('input', function (e) {
if (isWhitelistedKey(e.which)) {
emptyResultsContainer()
debounce(function () { search(e.target.value) }, options.debounceTime)
}
})
}
function search (query) {
if (isValidQuery(query)) {
emptyResultsContainer()
render(_$Repository_4.search(query), query)
}
}
function render (results, query) {
const len = results.length
if (len === 0) {
return appendToResultsContainer(options.noResultsText)
}
for (let i = 0; i < len; i++) {
results[i].query = query
appendToResultsContainer(_$Templater_7.compile(results[i]))
}
}
function isValidQuery (query) {
return query && query.length > 0
}
function isWhitelistedKey (key) {
return [13, 16, 20, 37, 38, 39, 40, 91].indexOf(key) === -1
}
function throwError (message) {
throw new Error('SimpleJekyllSearch --- ' + message)
}
})(window)
}());
</script>
<!-- Configuration -->
<script>
SimpleJekyllSearch({
searchInput: document.getElementById('search-input'),
resultsContainer: document.getElementById('results-container'),
noResultsText: '<p>Aucun résultat!</p>',
json: '/search.json',
searchResultTemplate: '<li><a href="{url}">{date}&nbsp;{title}</a>&nbsp;(Création {create})</li>'
})
</script>
</div></div>
<script>(function() {
var SOURCES = window.TEXT_VARIABLES.sources;
window.Lazyload.js(SOURCES.jquery, function() {
function scrollToAnchor(anchor, duration, callback) {
var $root = this;
$root.animate({ scrollTop: $(anchor).position().top }, duration, function() {
window.history.replaceState(null, '', window.location.href.split('#')[0] + anchor);
callback && callback();
});
}
$.fn.scrollToAnchor = scrollToAnchor;
});
})();
(function() {
var SOURCES = window.TEXT_VARIABLES.sources;
window.Lazyload.js(SOURCES.jquery, function() {
function affix(options) {
var $root = this, $window = $(window), $scrollTarget, $scroll,
offsetBottom = 0, scrollTarget = window, scroll = window.document, disabled = false, isOverallScroller = true,
rootTop, rootLeft, rootHeight, scrollBottom, rootBottomTop,
hasInit = false, curState;
function setOptions(options) {
var _options = options || {};
_options.offsetBottom && (offsetBottom = _options.offsetBottom);
_options.scrollTarget && (scrollTarget = _options.scrollTarget);
_options.scroll && (scroll = _options.scroll);
_options.disabled !== undefined && (disabled = _options.disabled);
$scrollTarget = $(scrollTarget);
isOverallScroller = window.isOverallScroller($scrollTarget[0]);
$scroll = $(scroll);
}
function preCalc() {
top();
rootHeight = $root.outerHeight();
rootTop = $root.offset().top + (isOverallScroller ? 0 : $scrollTarget.scrollTop());
rootLeft = $root.offset().left;
}
function calc(needPreCalc) {
needPreCalc && preCalc();
scrollBottom = $scroll.outerHeight() - offsetBottom - rootHeight;
rootBottomTop = scrollBottom - rootTop;
}
function top() {
if (curState !== 'top') {
$root.removeClass('fixed').css({
left: 0,
top: 0
});
curState = 'top';
}
}
function fixed() {
if (curState !== 'fixed') {
$root.addClass('fixed').css({
left: rootLeft + 'px',
top: 0
});
curState = 'fixed';
}
}
function bottom() {
if (curState !== 'bottom') {
$root.removeClass('fixed').css({
left: 0,
top: rootBottomTop + 'px'
});
curState = 'bottom';
}
}
function setState() {
var scrollTop = $scrollTarget.scrollTop();
if (scrollTop >= rootTop && scrollTop <= scrollBottom) {
fixed();
} else if (scrollTop < rootTop) {
top();
} else {
bottom();
}
}
function init() {
if(!hasInit) {
var interval, timeout;
calc(true); setState();
// run calc every 100 millisecond
interval = setInterval(function() {
calc();
}, 100);
timeout = setTimeout(function() {
clearInterval(interval);
}, 45000);
window.pageLoad.then(function() {
setTimeout(function() {
clearInterval(interval);
clearTimeout(timeout);
}, 3000);
});
$scrollTarget.on('scroll', function() {
disabled || setState();
});
$window.on('resize', function() {
disabled || (calc(true), setState());
});
hasInit = true;
}
}
setOptions(options);
if (!disabled) {
init();
}
$window.on('resize', window.throttle(function() {
init();
}, 200));
return {
setOptions: setOptions,
refresh: function() {
calc(true, { animation: false }); setState();
}
};
}
$.fn.affix = affix;
});
})();
(function() {
var SOURCES = window.TEXT_VARIABLES.sources;
window.Lazyload.js(SOURCES.jquery, function() {
function toc(options) {
var $root = this, $window = $(window), $scrollTarget, $scroller, $tocUl = $('<ul class="toc toc--ellipsis"></ul>'), $tocLi, $headings, $activeLast, $activeCur,
selectors = 'h1,h2,h3', container = 'body', scrollTarget = window, scroller = 'html, body', disabled = false,
headingsPos, scrolling = false, hasRendered = false, hasInit = false;
function setOptions(options) {
var _options = options || {};
_options.selectors && (selectors = _options.selectors);
_options.container && (container = _options.container);
_options.scrollTarget && (scrollTarget = _options.scrollTarget);
_options.scroller && (scroller = _options.scroller);
_options.disabled !== undefined && (disabled = _options.disabled);
$headings = $(container).find(selectors).filter('[id]');
$scrollTarget = $(scrollTarget);
$scroller = $(scroller);
}
function calc() {
headingsPos = [];
$headings.each(function() {
headingsPos.push(Math.floor($(this).position().top));
});
}
function setState(element, disabled) {
var scrollTop = $scrollTarget.scrollTop(), i;
if (disabled || !headingsPos || headingsPos.length < 1) { return; }
if (element) {
$activeCur = element;
} else {
for (i = 0; i < headingsPos.length; i++) {
if (scrollTop >= headingsPos[i]) {
$activeCur = $tocLi.eq(i);
} else {
$activeCur || ($activeCur = $tocLi.eq(i));
break;
}
}
}
$activeLast && $activeLast.removeClass('active');
($activeLast = $activeCur).addClass('active');
}
function render() {
if(!hasRendered) {
$root.append($tocUl);
$headings.each(function() {
var $this = $(this);
$tocUl.append($('<li></li>').addClass('toc-' + $this.prop('tagName').toLowerCase())
.append($('<a></a>').text($this.text()).attr('href', '#' + $this.prop('id'))));
});
$tocLi = $tocUl.children('li');
$tocUl.on('click', 'a', function(e) {
e.preventDefault();
var $this = $(this);
scrolling = true;
setState($this.parent());
$scroller.scrollToAnchor($this.attr('href'), 400, function() {
scrolling = false;
});
});
}
hasRendered = true;
}
function init() {
var interval, timeout;
if(!hasInit) {
render(); calc(); setState(null, scrolling);
// run calc every 100 millisecond
interval = setInterval(function() {
calc();
}, 100);
timeout = setTimeout(function() {
clearInterval(interval);
}, 45000);
window.pageLoad.then(function() {
setTimeout(function() {
clearInterval(interval);
clearTimeout(timeout);
}, 3000);
});
$scrollTarget.on('scroll', function() {
disabled || setState(null, scrolling);
});
$window.on('resize', window.throttle(function() {
if (!disabled) {
render(); calc(); setState(null, scrolling);
}
}, 100));
}
hasInit = true;
}
setOptions(options);
if (!disabled) {
init();
}
$window.on('resize', window.throttle(function() {
init();
}, 200));
return {
setOptions: setOptions
};
}
$.fn.toc = toc;
});
})();
/*(function () {
})();*/
</script><script>
/* toc must before affix, since affix need to konw toc' height. */(function() {
var SOURCES = window.TEXT_VARIABLES.sources;
var TOC_SELECTOR = window.TEXT_VARIABLES.site.toc.selectors;
window.Lazyload.js(SOURCES.jquery, function() {
var $window = $(window);
var $articleContent = $('.js-article-content');
var $tocRoot = $('.js-toc-root'), $col2 = $('.js-col-aside');
var toc;
var tocDisabled = false;
var hasSidebar = $('.js-page-root').hasClass('layout--page--sidebar');
var hasToc = $articleContent.find(TOC_SELECTOR).length > 0;
function disabled() {
return $col2.css('display') === 'none' || !hasToc;
}
tocDisabled = disabled();
toc = $tocRoot.toc({
selectors: TOC_SELECTOR,
container: $articleContent,
scrollTarget: hasSidebar ? '.js-page-main' : null,
scroller: hasSidebar ? '.js-page-main' : null,
disabled: tocDisabled
});
$window.on('resize', window.throttle(function() {
tocDisabled = disabled();
toc && toc.setOptions({
disabled: tocDisabled
});
}, 100));
});
})();
(function() {
var SOURCES = window.TEXT_VARIABLES.sources;
window.Lazyload.js(SOURCES.jquery, function() {
var $window = $(window), $pageFooter = $('.js-page-footer');
var $pageAside = $('.js-page-aside');
var affix;
var tocDisabled = false;
var hasSidebar = $('.js-page-root').hasClass('layout--page--sidebar');
affix = $pageAside.affix({
offsetBottom: $pageFooter.outerHeight(),
scrollTarget: hasSidebar ? '.js-page-main' : null,
scroller: hasSidebar ? '.js-page-main' : null,
scroll: hasSidebar ? $('.js-page-main').children() : null,
disabled: tocDisabled
});
$window.on('resize', window.throttle(function() {
affix && affix.setOptions({
disabled: tocDisabled
});
}, 100));
window.pageAsideAffix = affix;
});
})();
</script><!---->
</div>
<script>(function () {
var $root = document.getElementsByClassName('root')[0];
if (window.hasEvent('touchstart')) {
$root.dataset.isTouch = true;
document.addEventListener('touchstart', function(){}, false);
}
})();
</script>
</body>
</html>
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