{"id":110697,"date":"2023-10-09T15:10:16","date_gmt":"2023-10-09T13:10:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/novaya-versiya-pop3-i-imap4-servera-dovecot-2-3-21"},"modified":"2023-10-09T15:10:16","modified_gmt":"2023-10-09T13:10:16","slug":"novaya-versiya-pop3-i-imap4-servera-dovecot-2-3-21","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/novaya-versiya-pop3-i-imap4-servera-dovecot-2-3-21","title":{"rendered":"Nuova versione del server POP3 e IMAP4 Dovecot 2.3.21","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata pubblicata una nuova versione del server POP3\/IMAP4 multipiattaforma ad alte prestazioni Dovecot 2.3.21, che supporta i protocolli POP3 e IMAP4rev1 con estensioni comuni come SORT, THREAD e IDLE, insieme a meccanismi di autenticazione e crittografia (SASL, TLS, SCRAM). Dovecot mantiene la piena compatibilit\u00e0 con i tradizionali mbox e Maildir, utilizzando indici esterni per migliorare le prestazioni. \u00c8 possibile estendere le funzionalit\u00e0 tramite plugin (ad esempio, le quote e ACL sono implementate tramite plugin). Il codice del progetto \u00e8 distribuito con licenze LGPL e MIT.      <\/p>\n<p>Principali modifiche:  <\/p>\n<ul>\n<li class=\"l\"> lib-oauth2: \u00c8 consentita la verifica dei token JWT senza il campo &#171;typ&#187;. Il campo &#171;typ&#187; non \u00e8 utilizzato da alcuni emittenti di chiavi per risparmiare spazio, in particolare da Kubernetes. Ora l'assenza di &#171;typ&#187; \u00e8 permessa, ma se \u00e8 presente, deve comunque essere &#171;jwt&#187;.\n<li class=\"l\"> auth: La risposta &#171;Auth&#187; da passdb e userdb pu\u00f2 contenere il valore &#171;event_&lt;name&gt;=value&#187;, che verr\u00e0 aggiunto all'evento di accesso nel sistema e all'evento dell'utente di posta rispettivamente.\n<li class=\"l\"> lib-master: Imposta l'intestazione del processo in diverse fasi di inizializzazione per chiarire cosa si aspetta il processo.\n<li class=\"l\"> lib-storage: L'intervallo mail_temp_scan_interval ora aumenta del 0\u202630% a seconda dell'hash del nome utente, per ridurre la probabilit\u00e0 di picchi di carico.\n<li class=\"l\"> lib-storage: La scansione del file temporaneo \u00e8 stata spostata dall'apertura della casella postale alla sua chiusura, per ridurre il ritardo percepito dagli utenti.\n<li class=\"l\"> stats: Se la metrica include campi, tutti questi campi vengono esportati come contatori per prometheus nel formato exposition.\n<li class=\"l\"> &#171;*-login&#187;: I processi potrebbero terminare in modo anomalo a causa della chiusura brusca della connessione SSL.    &#8212; acl: Durante il caricamento del plugin, le variabili &#092;&#092;HasChildren e &#092;&#092;HasNoChildren venivano calcolate in modo errato per le caselle di posta contenenti nel proprio nome &#8216;*&#8217; e &#8216;%&#8217;.\n<li class=\"l\"> auth: Si verificava un errore durante la connessione al database PostgreSQL durante l'avvio.\n<li class=\"l\"> auth: Durante l'accesso con password errate (ad esempio, con uno schema sconosciuto) in passdb veniva restituito un errore &#171;password mismatch&#187; invece di un &#171;internal error&#187;.\n<li class=\"l\"> auth: I meccanismi XOAUTH2 e OAUTHBEARER non restituivano un messaggio di errore specifico per il protocollo in caso di errori. Questo ostacolava particolarmente la rilevazione di OIDC.\n<li class=\"l\"> dbox: Se l'intestazione last_temp_file_scan non era stata impostata (in particolare dopo una migrazione dsync), alla successiva apertura della casella di posta veniva sempre avviata la scansione dei file temporanei. Questo poteva causare un picco di carico dopo le migrazioni. Risolto utilizzando l'atime della directory della casella di posta in assenza dell'intestazione, che di solito sposta nel futuro il tempo di scansione.\n<li class=\"l\"> dict-redis: Si \u00e8 verificato un errore durante il rollback delle transazioni.\n<li class=\"l\">  dsync: Durante l'eliminazione della casella di posta al termine remoto, quando i separatori dei livelli gerarchici non coincidevano, si verificava un ciclo infinito che portava a un esaurimento della memoria.\n<li class=\"l\"> dsync: Il dsync incrementale non veniva eseguito per i nomi delle cartelle che terminano con &#8216;%&#8217;, a meno che non fosse impostato il valore BROKENCHAR. Allo stesso modo, i nomi delle cartelle con &#8216;%&#8217; in altre posizioni portavano a una rinomina non necessaria della cartella in un nome temporaneo e viceversa durante ogni dsync incrementale. Regressione v2.3.19.\n<li class=\"l\">  imap-hibernate: Se durante lo sblocco del client IMAP si verificava un timeout con il messaggio &#171;(version received)&#187;, successivamente lo sblocco poteva completarsi con successo e continuare a funzionare normalmente. Questo portava a confusione, poich\u00e9 imap-hibernate aveva gi\u00e0 registrato che il client si era disconnesso. \u00c8 possibile evitare questo costringendo la connessione a terminare al timeout di fine ibernazione.\n<li class=\"l\"> imapc: Crash quando scompare una cartella memorizzata visualizzata tramite un plugin virtuale.\n<li class=\"l\"> imapc: Risposte EXPUNGE, EXISTS o FETCH da <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-los-angeles\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3724\">server<\/a> una cassetta di posta precedentemente selezionata potrebbero essere elaborate come se appartenessero a una nuova cassetta di posta, attualmente selezionata. Questo poteva portare all'apparizione di avvisi.\n<li class=\"l\"> lib-http: Il server HTTP Dovecot (doveadm, stats\/openmetrics) poteva disconnettere i client HTTP prima di inviare completamente la risposta. Questo si verificava solo su server molto carichi, dove i buffer dei socket del kernel erano gravemente sovraccarichi.\n<li class=\"l\"> lib-http: Corretto un possibile crash del server http in caso di disconnessione anticipata del client. Regressione in 2.3.18.\n<li class=\"l\"> lib-index: La corruzione del file indice potrebbe aver causato un arresto anomalo del sistema. Risolto: Panic: file mail-transaction-log-view.c: line 165 (mail_transaction_log_view_set): asserzione fallita: (min_file_seq &lt;= max_file_seq).\n<li class=\"l\">  lib-index: La pulizia di un file cache esistente di oltre 1 GB potrebbe aver causato un errore. Ora, dopo la pulizia, i file cache che superano ancora 1 GB vengono rimossi. Risolto: Panic: file mail-index-util.c: line 10 (mail_index_uint32_to_offset): asserzione fallita: (offset &lt; 0x40000000).\n<li class=\"l\"> lib-lua: Il client HTTP non riusciva a risolvere i nomi DNS nei processi di posta poich\u00e9 si aspettava che il socket &#171;dns-client&#187; fosse nella directory corrente.\n<li class=\"l\"> lib-oauth2: Dovecot inviava client_id e client_secret come parametri POST al server di introspezione. Tuttavia, con l'autenticazione di base, il loro utilizzo \u00e8 facoltativo.\n<li class=\"l\"> lib-oauth2: La validazione del JWT &#171;aud&#187; non veniva eseguita se &#171;aud&#187; era assente nel token, ma era configurato in Dovecot.\n<li class=\"l\"> lib-oauth2: Controllo del tipo di chiave JWT troppo rigoroso.\n<li class=\"l\"> lib-oauth2: L'audience del token JWT non veniva verificata rispetto a client_id, come richiesto dalla specifica.\n<li class=\"l\"> lib-ssl-iostream: L'uso del parametro ssl_require_crl=yes poteva causare errori di verifica CRL per connessioni SSL\/TLS in uscita, anche se si presumeva che influenzasse la verifica CRL solo per i client. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/ssl-sertifikat\/\"   title=\"certificati SSL\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"345\">certificati SSL<\/a>. v2.3.17 regressione.\n<li class=\"l\"> lib-sql: Il driver MySQL causava perdite di memoria in caso di connessioni non riuscite.\n<li class=\"l\"> lib-storage: Diverse correzioni in caso di spazio su disco insufficiente.\n<li class=\"l\"> master: La configurazione dell'idle_kill non funzionava correttamente sui server sovraccarichi. Era molto poco probabile che un processo rimanesse inattivo abbastanza a lungo da essere terminato. Inoltre, con un elevato numero di processi (ad esempio imap), il codice di gestione dell'idle_kill utilizzava una notevole quantit\u00e0 di CPU sul processo principale. Ora ogni intervallo di tempo dell'idle_kill monitorer\u00e0 il numero minimo di processi inattivi e quindi terminer\u00e0 quel numero.\n<li class=\"l\"> mdbox: Il controllo dei file temporanei veniva eseguito per directory sempre vuote.\n<li class=\"l\"> mdbox: Durante la scrittura delle email, la chiamata a fdatasync() veniva eseguita nella directory padre sbagliata. Inoltre, in caso di errore, si verificava un crash invece di registrare l'errore nel log.\n<li class=\"l\"> notify_status: Il plugin si arresta in modo anomalo durante l'inizializzazione non riuscita dell'utente.    &#8212; pop3: L'invio di un comando con il carattere &#8216;:&#8217; portava a un crash &#171;assert-crash&#187;. Regressione nella versione 2.3.18.\n<li class=\"l\"> stats: Risolto il problema di panico verificatosi durante l'accesso a un esportatore di eventi inesistente durante l'aggiunta dinamica di una nuova metrica tramite il comando &#171;doveadm stats add&#187;. Ora viene restituito un errore corretto.\n<li class=\"l\"> stats: Se il processo esportava molti eventi e poi terminava, alcuni degli ultimi eventi potevano andare persi.\n<li class=\"l\"> stats: Nomi etichetta Prometheus non validi venivano creati in alcune configurazioni di histogram group_by. Prometheus rifiutava queste etichette.\n<li class=\"l\"> welcome: Il plugin non veniva eseguito in alcune situazioni in cui l'INBOX veniva creato, ma non aperto, ad esempio se veniva utilizzato GETMETADATA prima di aprire l'INBOX.  <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=59895\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u043d\u043e\u0432\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f \u043c\u043d\u043e\u0433\u043e\u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0433\u043e POP3\/IMAP4-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 Dovecot 2.3.21, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b POP3 \u0438 IMAP4rev1 \u0441 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u044b\u043c\u0438 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u044f\u043c\u0438, \u0442\u0430\u043a\u0438\u043c\u0438 \u043a\u0430\u043a SORT, THREAD \u0438 IDLE, \u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430\u043c\u0438 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0438 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u044f (SASL, TLS, SCRAM). 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