我到處尋找並詢問大量人,但目前爲止沒有人能夠幫助我。我試圖通過Java(8)應用程序從我的Windows(7)筆記本電腦連接到遠程計算機上的postgres(9.6)數據庫。我們使用Kerberos來保護訪問,但我擁有一個有效的Kerberos帳戶,並且可以通過de Ticket Manager創建票據。我也可以登錄到需要Kerberos身份驗證的其他「服務」,儘管不是通過java而是通過瀏覽器。從Java/Windows7連接到帶有Kerberos的Postgres數據庫
但無論我嘗試,我無法讓我的java程序工作。這裏就是我的了:
krb5.ini
[libdefaults]
default_realm = <domain>
forwardable = true
kdc_timesync = 1
ccache_type = 4
proxiable = true
dns_lookup_kdc = true
dns_lookup_realm = true
[realms]
<domain>.NET = {
admin_server = <domain-server>
default_domain = <domain>
}
[domain_realm]
.<domain> = <domain>
<domain> = <domain>
.local.nl.<company>.com = <domain>
local.nl.<company>.com = <domain>
[login]
krb4_convert = true
krb4_get_tickets = false
的Jaas.conf:
pgjdbc {
com.sun.security.auth.module.Krb5LoginModule required
refreshKrb5Config=true
doNotPrompt=false
useTicketCache=false
renewTGT=false
useKeyTab=true
keyTab="<location>/<filename>.keytab"
debug=true
client=true
principal="<username>@<domain>";
};
.keytab文件
public class KerberosPostgresClient {
static {
System.setProperty("java.security.krb5.conf","c:/tmp/krb5.ini");
System.setProperty("java.security.krb5.realm","<domain>");
System.setProperty("java.security.krb5.kdc","<domain>");
System.setProperty("javax.security.auth.useSubjectCredsOnly","false");
System.setProperty("java.security.auth.login.config","c:/tmp/jaas.conf"); }
@Test
public void test() throws Exception {
String url = "jdbc:postgresql://<hostname>:<port>/<database>";
Properties properties = new Properties();
properties.setProperty("JAASConfigName", "pgjdbc");
try (Connection conn = DriverManager.getConnection(url, connInfo)) {
conn.createStatement();
} catch (Exception e) {
e.printStackTrace();
}
}
}
很簡單的java代碼可以找到keytab,jaas.conf。我在另一臺機器上創建了keytab文件,但使用相同的主體和密碼。
當我運行該程序,我看到:
Debug is true storeKey false useTicketCache false useKeyTab true doNotPrompt false ticketCache is null isInitiator true KeyTab is c:/tmp/<username>.keytab refreshKrb5Config is true principal is <username>@<domain> tryFirstPass is false useFirstPass is false storePass is false clearPass is false
Refreshing Kerberos configuration
過了片刻我得到一個異常:
[Krb5LoginModule] authentication failed
Receive timed out
org.postgresql.util.PSQLException: GSS Authentication failed
at org.postgresql.gss.MakeGSS.authenticate(MakeGSS.java:65)
....
Caused by: java.net.SocketTimeoutException: Receive timed out
at java.net.DualStackPlainDatagramSocketImpl.socketReceiveOrPeekData(Native Method)
at java.net.DualStackPlainDatagramSocketImpl.receive0(DualStackPlainDatagramSocketImpl.java:120)
at java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:144)
at java.net.DatagramSocket.receive(DatagramSocket.java:812)
at sun.security.krb5.internal.UDPClient.receive(NetClient.java:206)
at sun.security.krb5.KdcComm$KdcCommunication.run(KdcComm.java:411)
at sun.security.krb5.KdcComm$KdcCommunication.run(KdcComm.java:364)
at java.security.AccessController.doPrivileged(Native Method)
at sun.security.krb5.KdcComm.send(KdcComm.java:348)
at sun.security.krb5.KdcComm.sendIfPossible(KdcComm.java:253)
at sun.security.krb5.KdcComm.send(KdcComm.java:229)
at sun.security.krb5.KdcComm.send(KdcComm.java:200)
at sun.security.krb5.KrbAsReqBuilder.send(KrbAsReqBuilder.java:316)
at sun.security.krb5.KrbAsReqBuilder.action(KrbAsReqBuilder.java:361)
at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:776)
... 45 more
經常拿這表明它找不到其他異常keytab文件,但與上述設置似乎工作。我也可以從我的機器上ping postgres數據庫。
我發現:Error connecting to PostgreSQL 9.4 with MIT Kerberos via JDBC vs CLI但一直沒有解決
當我看到在收到我首先想到的是防火牆的問題套接字超時。 –
嗨,約翰,謝謝你的輸入。我記得有人提到,stacktrace意味着它使用UDP並且可能被防火牆阻止(?)。如果是這樣的話,我該如何設置它使用TCP/IP – mroosendaal
更新:添加「udp_preference_limit = 1」到krb5.ini來使用TCP,但現在我得到「連接超時」,所以我認爲你是對的因爲這是一個防火牆問題。奇怪的是,其他人,儘管他們使用Mac可以連接到數據庫。我會與DBA的人員覈對。 – mroosendaal