+<div>
+ <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 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="#kSAMBA"> kSAMBA</a></li>
+ <li><a href="#SMBKlog"> SMBKlog</a></li>
+ <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="#Attachments"> Attachments</a></li>
+ </ul>
+ </li>
+ </ul>
+</div>
+
# <a name="Using Samba as an AFS gateway"></a> Using Samba as an AFS gateway
Recently I've been researching methods of using Samba as an AFS gateway. Below are my findings so far. Please feel free to add/correct stuff. -- [[DanielClark]] - 04 Aug 2002
- 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 <code><b>--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)
- Doesn't work with operating systems that do not support PAM.
-### <a name="Compile Samba <code><b>--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.
## <a name="No plain text passwords sent ove"></a> No plain text passwords sent over network
-These methods that avoid sending plain text passwords over the network.
+These are methods that avoid sending plain text passwords over the network.
Advantages:
Disadvantages:
-- Require modifications to stock Samba distribution
+- Requires modifications to stock Samba distribution
- Requires additional infrastructure beyond Samba
- All are primarily internal projects that people did for their employers, support may be minimal to nonexistent.
### <a name="SMBKlog"></a> SMBKlog
-SMBKlog uses out-of-band authentication over SSL. The server sends the client an RSA public key - the client encrypts the password with the public key and sends it to the server, which then decrypts it. It's home page no longer seems to exist. There is an email explaining it at <http://samba.cadcamlab.org/lists/samba-technical/Jul2001/00363.html> , and the code is available from <http://www.gentoo.org/cgi-bin/viewcvs/gentoo-x86/net-fs/samba/files/Attic/> (if you look hard).
+SMBKlog uses out-of-band authentication over SSL. The server sends the client an RSA public key - the client encrypts the password with the public key and sends it to the server, which then decrypts it. There is an email explaining it at <http://samba.cadcamlab.org/lists/samba-technical/Jul2001/00363.html> .
<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td> URL </td>
- <td><a href="http://www22.brinkster.com/jvrobert" target="_top">http://www22.brinkster.com/jvrobert</a> (down as of 2002-08-01) </td>
+ <td><a href="http://www22.brinkster.com/jvrobert" target="_top">http://www22.brinkster.com/jvrobert</a></td>
</tr>
<tr>
<td> Email </td>
Advantages:
- Password not sent over network in plain text
-- Not specific to any particular Kerberos implementation
+- Not specific to any particular Kerberos/AFS implementation [ Transarc/OpenAFS OK ]
- Uses [[OpenSSL]] so probably relatively easy to write new Windows clients
- Successfully used at Intel to comply with corporate security requirements
Disadvantages:
- Password exists in plain text form on Samba server, at least in memory, for some period of time (Samba server decrypts password to plaintext form and uses that to get AFS tokens)
-- Seems to be pretty specific to Intel's site - unclear if anyone else is using it.
- Requires each Windows client to install some software
- - Windows client software doesn't seem to be open source
- - Windows client software dies on Windows 2000 and XP
-- Must run specific Samba version or do some porting to newer version
-- Web site no longer exists. Doesn't seem to be under active public development.
+ - Windows client software dies on Windows 2000 and XP [ May be fixed in current version ]
+- Must run specific Samba version or do some porting to newer version [ Should be straightforward ]
+- Not under heavy active development.
+
+Updates:
+
+- Frank Cameron (<cameron@ctc.com>) updated Jason's smbklog patches to work with Samba 2.2.7
+ - [samba-2.2.7-afstoken.patch](http://www.dementia.org/twiki//view/samba-2.2.7-afstoken.patch): Updated smbklog patch for Samba 2.2.7
+- Also available is a patch to compile Samba 2.2.7 on [[RedHat]] 8
+ - [samba-2.2.7\_afstoken.spec](http://www.dementia.org/twiki//view/samba-2.2.7_afstoken.spec): Spec file to build Samba 2.2.7 w/ SMBKlog on RH 8
### <a name="FOKSTRAUT"></a> FOKSTRAUT
<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td> URL </td>
- <td><a href="http://www.usenix.org/events/lisa2000/full_papers/beck/beck_html/" target="_top">http://www.usenix.org/events/lisa2000/full_papers/beck/beck_html/</a></td>
+ <td colspan="2"><a href="http://www.usenix.org/events/lisa2000/full_papers/beck/beck_html/" target="_top">http://www.usenix.org/events/lisa2000/full_papers/beck/beck_html/</a></td>
</tr>
<tr>
<td> </td>
<td><a href="http://www.ualberta.ca/~sholstea/patches.tar" target="_top">http://www.ualberta.ca/~sholstea/patches.tar</a></td>
+ <td> Patches against Samba 2.2.4 </td>
</tr>
<tr>
<td> Email </td>
- <td> Steve Holstead <a href="mailto:Steve.Holstead@ualberta.ca">Steve.Holstead@ualberta.ca</a></td>
+ <td colspan="2"> Steve Holstead <a href="mailto:Steve.Holstead@ualberta.ca">Steve.Holstead@ualberta.ca</a></td>
</tr>
<tr>
<td> </td>
- <td> Robert Beck <a href="mailto:beck@bofh.ucs.ualberta.ca">beck@bofh.ucs.ualberta.ca</a> or <a href="mailto:beck@obtuse.com">beck@obtuse.com</a></td>
+ <td colspan="2"> Robert Beck <a href="mailto:beck@bofh.ucs.ualberta.ca">beck@bofh.ucs.ualberta.ca</a> or <a href="mailto:beck@obtuse.com">beck@obtuse.com</a></td>
</tr>
</table>
Advantages:
- Password not sent over network in plain text
-- Not specific to any particular Kerberos implementation
- In use for several years with a large number of clients
- Has advantages other than secure AFS login
- Seems to be under active development
- Requires some out-of-band secure infrastructure for users to change their passwords.
- Authors mention using a simple script on a login server in which a user can make an SMB connect and authenticate themselves. Unsure of the security of this solution.
- 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 plaintext on 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&m=108238783519493&w=2](http://marc.theaimsgroup.com/?l=samba&m=108238783519493&w=2)
+- [http://marc.theaimsgroup.com/?l=samba&m=108119099330691&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" < lha () stacken ! kth ! se >
+
+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&m=102214554108308&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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[http://www.shop263.com/i-49/116.htm 阳离子有机高分子絮凝剂] [http://www.shop263.com/i-49/117.htm 氧化钙] [http://www.shop263.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] 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[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 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织物整理剂] [http://www.shop263.com/i-49/273.htm 脂肪胺] [http://www.shop263.com/i-49/274.htm 脂肪酸丁酯] [http://www.shop263.com/i-49/275.htm 脂肪酸酯] [http://www.shop263.com/i-49/276.htm 植物沥青] [http://www.shop263.com/i-49/277.htm 植物生长调节剂] [http://www.shop263.com/i-49/278.htm 纸力增强剂] [http://www.shop263.com/i-49/279.htm 纸品乳液] [http://www.shop263.com/i-49/280.htm 指示剂] [http://www.shop263.com/i-49/281.htm 制动液] [http://www.shop263.com/i-49/282.htm 制冷剂] [http://www.shop263.com/i-49/283.htm 中低分子量聚异丁烯] [http://www.shop263.com/i-49/284.htm 中高档润滑油] [http://www.shop263.com/i-49/285.htm 中铬黄] [http://www.shop263.com/i-49/286.htm 中和缓蚀剂] [http://www.shop263.com/i-49/287.htm 中间体] [http://www.shop263.com/i-49/288.htm 中脱剂] [http://www.shop263.com/i-49/289.htm 中性酯蜡] [http://www.shop263.com/i-49/290.htm 终止剂] [http://www.shop263.com/i-49/291.htm 仲辛醇] [http://www.shop263.com/i-49/292.htm 重氮] [http://www.shop263.com/i-49/293.htm 重铬酸钾] [http://www.shop263.com/i-49/294.htm 重晶石矿粉] [http://www.shop263.com/i-49/295.htm 重蜡] [http://www.shop263.com/i-49/296.htm 重质碳酸钙] [http://www.shop263.com/i-49/297.htm 重质正构烷烃] [http://www.shop263.com/i-49/298.htm 珠光剂] [http://www.shop263.com/i-49/299.htm 竹醋液] [http://www.shop263.com/i-49/300.htm 助催化剂] [http://www.shop263.com/i-49/301.htm 助焊剂] [http://www.shop263.com/i-49/302.htm 助剂] [http://www.shop263.com/i-49/303.htm 助留助滤剂] [http://www.shop263.com/i-49/304.htm 助滤剂] [http://www.shop263.com/i-49/305.htm 助燃剂] [http://www.shop263.com/i-49/306.htm 铸造用糠醇树脂] [http://www.shop263.com/i-49/307.htm 专用金属切削液] [http://www.shop263.com/i-49/308.htm 状碳] [http://www.shop263.com/i-49/309.htm 子聚酰胺树脂] [http://www.shop263.com/i-49/310.htm 紫外线吸收剂] [http://www.shop263.com/i-49/311.htm 阻垢分散剂] [http://www.shop263.com/i-49/312.htm 阻垢缓蚀剂] [http://www.shop263.com/i-49/313.htm 阻垢剂] [http://www.shop263.com/i-49/314.htm 阻聚剂] [http://www.shop263.com/i-49/315.htm 阻燃剂] [http://www.shop263.com/i-49/316.htm 阻油剂] [http://www.shop263.com/i-49/317.htm 钻井泥浆] [http://www.shop263.com/i-49/318.htm 钻井泥浆助剂] 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