none
[openafs-wiki.git] / AFSLore / SMBtoAFS.mdwn
index d304b3c..6acff2e 100644 (file)
@@ -2,8 +2,8 @@
   <ul>
     <li><a href="#Using Samba as an AFS gateway"> Using Samba as an AFS gateway</a><ul>
         <li><a href="#Plain text passwords sent over n"> Plain text passwords sent over network</a><ul>
-            <li><a href="#Compile Samba --with-pam"> Compile Samba --with-pam</a></li>
-            <li><a href="#Compile Samba --with-afs"> Compile Samba --with-afs</a></li>
+            <li><a href="#Compile Samba 2 --with-pam"> Compile Samba 2 --with-pam</a></li>
+            <li><a href="#Compile Samba 2 --with-afs"> Compile Samba 2 --with-afs</a></li>
           </ul>
         </li>
         <li><a href="#No plain text passwords sent ove"> No plain text passwords sent over network</a><ul>
             <li><a href="#FOKSTRAUT"> FOKSTRAUT</a></li>
           </ul>
         </li>
+        <li><a href="#New: More secure options"> New: More secure options</a><ul>
+            <li><a href="#Samba 3 built-in AFS support"> Samba 3 built-in AFS support</a></li>
+            <li><a href="#kimpersonate"> kimpersonate </a></li>
+          </ul>
+        </li>
         <li><a href="#Random Links"> Random Links</a></li>
-        <li><a href="#Discussion / What are you doing?"> Discussion / What are you doing?</a></li>
+        <li><a href="#Attachments"> Attachments</a></li>
       </ul>
     </li>
   </ul>
@@ -39,7 +44,7 @@ Disadvantages:
 - Client gets no warning before AFS tokens expire
 - To get new tokens, client must unmap and then remap the drive letter corresponding to the AFS gateway
 
-### <a name="Compile Samba --with-pam"></a> Compile Samba --with-pam
+### <a name="Compile Samba 2 --with-pam"></a> Compile Samba 2 --with-pam
 
 This causes Samba to use pluggable authentication modules (PAM) for authentication. PAM is available on many Unix variants, notably Linux and Solaris. There are PAM modules for the various Kerberos implementations that work with AFS; the module for the default kaserver comes with [[OpenAFS]]. For some more info on PAM see the [Samba doc](http://de.samba.org/samba/ftp/docs/htmldocs/Samba-HOWTO-Collection.html#PAM). Many precompiled versions of Samba are built with this option (i.e. Redhat's Samba RPMs)
 
@@ -51,7 +56,7 @@ Disadvantages:
 
 - Doesn't work with operating systems that do not support PAM.
 
-### <a name="Compile Samba --with-afs"></a> Compile Samba --with-afs
+### <a name="Compile Samba 2 --with-afs"></a> Compile Samba 2 --with-afs
 
 This links Samba against AFS authentication code directly.
 
@@ -196,8 +201,179 @@ Disadvantages:
   - Another possibility would be a web application behind an SSL server running on the same host as the Samba server.
 - Passwords must be stored in cleartext on the Samba server.
 
+## <a name="New: More secure options"></a> New: More secure options
+
+### <a name="Samba 3 built-in AFS support"></a> Samba 3 built-in AFS support
+
+It looks like Samba 3.0.4 has built-in AFS support (perhaps only for the Kerberos 4 kaserver on GNU/Linux with [[OpenAFS]] however). The relevant configure option looks like:
+
+      --with-fake-kaserver    Include AFS fake-kaserver support (default=no)
+
+References:
+
+- <http://www.samba.org/samba/docs/man/smb.conf.5.html#AFSSHARE>
+- <news://news.gmane.org:119/E19sNzf-0002uv-00@intern.SerNet.DE>
+- <http://www.dragoninc.on.ca/mail-archives/samba-technical/2003-10/0339.html>
+- [http://marc.theaimsgroup.com/?l=samba&amp;m=108238783519493&amp;w=2](http://marc.theaimsgroup.com/?l=samba&m=108238783519493&w=2)
+- [http://marc.theaimsgroup.com/?l=samba&amp;m=108119099330691&amp;w=2](http://marc.theaimsgroup.com/?l=samba&m=108119099330691&w=2)
+- <http://lists.samba.org/archive/samba/2004-April/084693.html>
+
+Also based on <http://us4.samba.org/samba/ftp/pre/WHATSNEW-3-0-5pre1.txt> it looks like Samba 3.0.5 will have support to display and set AFS acls via the NT security editor.
+
+Here are some relevant comments from the Samba 3.0.4 code (author's homepage is at <http://www.sernet.de/vl/> ):
+
+    ./source/lib/afs.c:
+    /*
+      This routine takes a radical approach completely bypassing the
+      Kerberos idea of security and using AFS simply as an intelligent
+      file backend. Samba has persuaded itself somehow that the user is
+      actually correctly identified and then we create a ticket that the
+      AFS server hopefully accepts using its KeyFile that the admin has
+      kindly stored to our secrets.tdb.
+
+      Thanks to the book "Network Security -- PRIVATE Communication in a
+      PUBLIC World" by Charlie Kaufman, Radia Perlman and Mike Speciner
+      Kerberos 4 tickets are not really hard to construct.
+
+      For the comments "Alice" is the User to be auth'ed, and "Bob" is the
+      AFS server.
+    */
+
+    ./source/lib/afs_settoken.c:
+    /*
+      Put an AFS token into the Kernel so that it can authenticate against
+      the AFS server. This assumes correct local uid settings.
+
+      This is currently highly Linux and OpenAFS-specific. The correct API
+      call for this would be ktc_SetToken. But to do that we would have to
+      import a REALLY big bunch of libraries which I would currently like
+      to avoid.
+    */
+
+### <a name="kimpersonate"></a> kimpersonate
+
+The major problem when exporting the AFS filespace read-write to SMB (Windows fileshareing) using Samba is the transfer of the user token to the smb-server. The simple may is to use clear-text password between the Windows client and the samba-server, and then to get tokens for the user with this password. This solution is clearly not acceptable for security aware AFS administrators.
+
+On solution is to use \`kimpersonate' + store afs key on fileserver. To obtain the kimersonate code contact "Love H�rnquist-�strand" &lt; lha () stacken ! kth ! se &gt;
+
+Here are some references to this technique:
+
+- <https://lists.openafs.org/pipermail/openafs-info/2003-July/010026.html>
+- <http://www.mail-archive.com/openafs-info@openafs.org/msg08471.html>
+- <http://openbsd.mirrors.pair.com/src/usr.sbin/afs/src/doc/arla.info>
+- <http://www.it.kth.se/~aep/licentiate/PB-lanman2001.pdf>
+
+Here is the kimpersonate **README**:
+
+    kimpersonate
+    ============
+
+    kimpersonate takes a keytab/srvtab/AFS KeyFile and impersonates
+    kerberos credental case for a user. See manpage for documentation.
+
+    Very useful when using with samba.
+
+    Using kimpersonate with SAMBA
+    =============================
+
+    entry in smb.conf
+
+            root preexec = /usr/samba/bin/su-user-login '%u'
+
+    Also see the su-user-login file, note that this file contains hacks
+    that parses the %u for samba 3.0-alpha22 something using domain
+    logins. Check that is matches your usage.
+
+    You need to make sure that somehow the samba does a afs setpag call
+    before calling afslog/aklog. See the patch
+    samba-setpag-patch-linux-and-freebsd above.
+
+Here is a text rendition the kimpersonate-1.0 **man page**:
+
+    KERBEROS(SECTION)                    LOCAL                   KERBEROS(SECTION)
+
+    NAME
+         kimpersonate - impersonate a user when there exist a srvtab, keyfile or
+         KeyFile
+
+    SYNOPSIS
+         kimpersonate [-s string | --server=string] [-c string | --client=string]
+                      [-k string | --keytab=string] [-4 | --krb4] [-5 | --krb5]
+                      [-e integer | --expire-time=integer] [-a string |
+                      --client-address=string] [-t string | --enc-type=string] [-f
+                      string | --ticket-flags=string] [--verbose] [--version]
+                      [--help]
+
+    DESCRIPTION
+         The kimpersonate program create a "fake" ticket using the service-key of
+         the service, the service key can be read from a Kerberos 5 keytab, AFS
+         KeyFile or (if compiled with support for Kerberos 4) a Kerberos 4 srvtab.
+         Supported options:
+
+         -s string, --server=string
+                 name of server principal
+
+         -c string, --client=string
+                 name of client principal
+
+         -k string, --keytab=string
+                 name of keytab file
+
+         -4, --krb4
+                 create a kerberos 4 ticket
+
+         -5, --krb5
+                 create a kerberos 5 ticket
+
+         -e integer, --expire-time=integer
+                 lifetime of ticket in seconds
+
+         -a string, --client-address=string
+                 address of client
+
+         -t string, --enc-type=string
+                 encryption type
+
+         -f string, --ticket-flags=string
+                 ticket flags for krb5 ticket
+
+         --verbose
+                 Verbose output
+
+         --version
+                 Print version
+
+         --help
+
+    FILES
+         Uses /etc/krb5.keytab, /etc/srvtab and /usr/afs/etc/KeyFile when avalible
+         and the the -k is used with appropriate prefix.
+
+    EXAMPLES
+         kimpersonate can be used in samba root preexec option or for debugging.
+         kimpersonate -s host/hummel.e.kth.se@E.KTH.SE -c lha@E.KTH.SE -5 --no-
+         krb4 will create a Kerberos 5 ticket for lha@E.KTH.SE for the host hum-
+         mel.e.kth.se if there exist a keytab entry for it in /etc/krb5.keytab
+
+         kimpersonate -k krb4:/etc/srvtab -s host/hummel.e.kth.se@E.KTH.SE -c
+         lha@E.KTH.SE --no-krb5 -4 will create a Kerberos 4 ticket for
+         lha@E.KTH.SE for the host hummel.e.kth.se if there exist a srvtab entry
+         for it in /etc/srvtab Note the Kerberos 5 syntax of the server.
+
+    SEE ALSO
+         kinit(1)
+
+    AUTHORS
+         Love H�rnquist-�strand < lha () stacken ! kth ! se >
+
+    Heimdal                          July 30, 2000                         Heimdal
+
 ## <a name="Random Links"></a> Random Links
 
 2002-05 discussion on samba-technical: [http://marc.theaimsgroup.com/?l=samba-technical&amp;m=102214554108308&amp;w=2](http://marc.theaimsgroup.com/?l=samba-technical&m=102214554108308&w=2)
 
-## <a name="Discussion / What are you doing?"></a> Discussion / What are you doing?
+## <a name="Attachments"></a> Attachments
+
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3.com/i-49/118.htm 氧化铬绿] [http://www.shop263.com/i-49/119.htm 氧化聚乙烯蜡] [http://www.shop263.com/i-49/120.htm 氧化锑] [http://www.shop263.com/i-49/121.htm 氧化铁红] [http://www.shop263.com/i-49/122.htm 氧化铁绿] [http://www.shop263.com/i-49/123.htm 氧化退浆剂] [http://www.shop263.com/i-49/124.htm 氧化锌脱硫剂] [http://www.shop263.com/i-49/125.htm 氧化锌预分散体] [http://www.shop263.com/i-49/126.htm 氧化制合成气催化剂] [http://www.shop263.com/i-49/127.htm 氧气] [http://www.shop263.com/i-49/128.htm 药剂] [http://www.shop263.com/i-49/129.htm 药物原料] [http://www.shop263.com/i-49/130.htm 药物中间体] [http://www.shop263.com/i-49/131.htm 药用活性炭] [http://www.shop263.com/i-49/132.htm 药用氯化钾] [http://www.shop263.com/i-49/133.htm 药用炭] [http://www.shop263.com/i-49/134.htm 药用铁粉] [http://www.shop263.com/i-49/135.htm 椰壳] [http://www.shop263.com/i-49/136.htm 液碱] [http://www.shop263.com/i-49/137.htm 液蜡] [http://www.shop263.com/i-49/138.htm 液氯] [http://www.shop263.com/i-49/139.htm 液态甲基四氢苯酐固化剂] [http://www.shop263.com/i-49/140.htm 液体二氧化硫] [http://www.shop263.com/i-49/141.htm 液体二氧化碳] [http://www.shop263.com/i-49/142.htm 液体复合热稳定剂] [http://www.shop263.com/i-49/143.htm 液体活性溴杀生剂] [http://www.shop263.com/i-49/144.htm 液体硫转移助剂] [http://www.shop263.com/i-49/145.htm 液体矽利康] [http://www.shop263.com/i-49/146.htm 液体荧光增白剂] [http://www.shop263.com/i-49/147.htm 液压油] [http://www.shop263.com/i-49/148.htm 液状石蜡] [http://www.shop263.com/i-49/149.htm 一氯蒽醌] [http://www.shop263.com/i-49/150.htm 医药化工] [http://www.shop263.com/i-49/151.htm 医药原料] [http://www.shop263.com/i-49/152.htm 医药中间体] [http://www.shop263.com/i-49/153.htm 依那普利氢化物酸酐] [http://www.shop263.com/i-49/154.htm 仪器设备] [http://www.shop263.com/i-49/155.htm 乙苯脱氢催化剂] [http://www.shop263.com/i-49/156.htm 乙丙共聚物粘度指数改进剂] [http://www.shop263.com/i-49/157.htm 乙丙橡胶] [http://www.shop263.com/i-49/158.htm 乙二醇醋酸酯] [http://www.shop263.com/i-49/159.htm 乙二醇二甲醚] [http://www.shop263.com/i-49/160.htm 乙二醇二甲酸酯] [http://www.shop263.com/i-49/161.htm 乙二醇二乙醚] [http://www.shop263.com/i-49/162.htm 乙二醇甲醚] [http://www.shop263.com/i-49/163.htm 乙二醇醚] [http://www.shop263.com/i-49/164.htm 乙二醇双硬脂酸酯] [http://www.shop263.com/i-49/165.htm 乙基] [http://www.shop263.com/i-49/166.htm 乙基蒽醌] [http://www.shop263.com/i-49/167.htm 乙基己酯] [http://www.shop263.com/i-49/168.htm 乙烯基官能团硅烷] [http://www.shop263.com/i-49/169.htm 乙酰基柠檬酸三正丁酯] [http://www.shop263.com/i-49/170.htm 乙酯] [http://www.shop263.com/i-49/171.htm 异丙苯] [http://www.shop263.com/i-49/172.htm 异丙醚] [http://www.shop263.com/i-49/173.htm 异丁醇] [http://www.shop263.com/i-49/174.htm 异丁烯] [http://www.shop263.com/i-49/175.htm 异氰酸正丁酯] [http://www.shop263.com/i-49/176.htm 异辛酸] [http://www.shop263.com/i-49/177.htm 阴极电泳涂料] [http://www.shop263.com/i-49/178.htm 阴离子表面活性剂] [http://www.shop263.com/i-49/179.htm 阴离子型聚丙烯酰胺] [http://www.shop263.com/i-49/180.htm 銀系無機紡織整理劑] [http://www.shop263.com/i-49/181.htm 印染助剂] [http://www.shop263.com/i-49/182.htm 荧光颜料] [http://www.shop263.com/i-49/183.htm 荧光增白剂] [http://www.shop263.com/i-49/184.htm 萤石] [http://www.shop263.com/i-49/185.htm 硬化剂] [http://www.shop263.com/i-49/186.htm 硬脂酸] [http://www.shop263.com/i-49/187.htm 硬脂酸丁酯] [http://www.shop263.com/i-49/188.htm 硬脂酸钙] [http://www.shop263.com/i-49/189.htm 硬脂酸酰胺] [http://www.shop263.com/i-49/190.htm 硬脂酸盐] [http://www.shop263.com/i-49/191.htm 硬脂酸盐热稳定剂] [http://www.shop263.com/i-49/192.htm 核磁共振传递剂] [http://www.shop263.com/i-49/193.htm 油剂] [http://www.shop263.com/i-49/194.htm 油浆系统阻垢剂] [http://www.shop263.com/i-49/195.htm 油浆阻垢剂] [http://www.shop263.com/i-49/196.htm 油井水泥添加剂] [http://www.shop263.com/i-49/197.htm 油墨防结皮剂] [http://www.shop263.com/i-49/198.htm 油墨清] [http://www.shop263.com/i-49/199.htm 油墨溶剂] [http://www.shop263.com/i-49/200.htm 油漆] [http://www.shop263.com/i-49/201.htm 油气层保护剂] [http://www.shop263.com/i-49/202.htm 油水井环空保护液] [http://www.shop263.com/i-49/203.htm 油酸] [http://www.shop263.com/i-49/204.htm 油酸丁酯] [http://www.shop263.com/i-49/205.htm 油酸酰胺] [http://www.shop263.com/i-49/206.htm 油酸辛酯] [http://www.shop263.com/i-49/207.htm 油田化学剂] [http://www.shop263.com/i-49/208.htm 油田化学品] [http://www.shop263.com/i-49/209.htm 油田开采助剂] [http://www.shop263.com/i-49/210.htm 油田破乳剂] [http://www.shop263.com/i-49/211.htm 油田污水处理剂] [http://www.shop263.com/i-49/212.htm 油田助剂] [http://www.shop263.com/i-49/213.htm 油温炉] [http://www.shop263.com/i-49/214.htm 油性加工油] [http://www.shop263.com/i-49/215.htm 油脂化工] [http://www.shop263.com/i-49/216.htm 油脂活性炭] [http://www.shop263.com/i-49/217.htm 有碘化物] [http://www.shop263.com/i-49/218.htm 有机硅] [http://www.shop263.com/i-49/219.htm 有机硅材料] [http://www.shop263.com/i-49/220.htm 有机硅高效消泡剂] [http://www.shop263.com/i-49/221.htm 有机硅建筑] [http://www.shop263.com/i-49/222.htm 有机硅类] [http://www.shop263.com/i-49/223.htm 有机硅乳液] [http://www.shop263.com/i-49/224.htm 有机硅消泡剂] [http://www.shop263.com/i-49/225.htm 有机磷螯合剂] [http://www.shop263.com/i-49/226.htm 有机磷聚羧酸多元共聚物] [http://www.shop263.com/i-49/227.htm 有机磷酸酯类阻燃剂] [http://www.shop263.com/i-49/228.htm 有机膨润土] [http://www.shop263.com/i-49/229.htm 有机铅稳定剂] [http://www.shop263.com/i-49/230.htm 有机试剂] [http://www.shop263.com/i-49/231.h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