diff options
| author | Jelmer Vernooij <jelmer@samba.org> | 2003-07-01 22:58:52 +0000 |
|---|---|---|
| committer | Jelmer Vernooij <jelmer@samba.org> | 2003-07-01 22:58:52 +0000 |
| commit | 3878085eca35d5c3b08761f61281de0b1b49ce2d (patch) | |
| tree | aa9e3aa50d1fc99ce341ee2eff24352266c2063b /docs/htmldocs/pwencrypt.html | |
| parent | b32d48533f3ad9e8a510c83c8acf4d543556549d (diff) | |
| download | samba-3878085eca35d5c3b08761f61281de0b1b49ce2d.tar.gz samba-3878085eca35d5c3b08761f61281de0b1b49ce2d.tar.bz2 samba-3878085eca35d5c3b08761f61281de0b1b49ce2d.zip | |
regenerate docs
(This used to be commit cc02d3bc170fe5c8c4474156edb6c83720a47aa0)
Diffstat (limited to 'docs/htmldocs/pwencrypt.html')
| -rw-r--r-- | docs/htmldocs/pwencrypt.html | 434 |
1 files changed, 0 insertions, 434 deletions
diff --git a/docs/htmldocs/pwencrypt.html b/docs/htmldocs/pwencrypt.html deleted file mode 100644 index 9414399bf4..0000000000 --- a/docs/htmldocs/pwencrypt.html +++ /dev/null @@ -1,434 +0,0 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> -<HTML -><HEAD -><TITLE ->LanMan and NT Password Encryption in Samba</TITLE -><META -NAME="GENERATOR" -CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ -"><LINK -REL="HOME" -TITLE="SAMBA Project Documentation" -HREF="samba-howto-collection.html"><LINK -REL="UP" -TITLE="General installation" -HREF="introduction.html"><LINK -REL="PREVIOUS" -TITLE="Quick Cross Subnet Browsing / Cross Workgroup Browsing guide" -HREF="browsing-quick.html"><LINK -REL="NEXT" -TITLE="Type of installation" -HREF="type.html"></HEAD -><BODY -CLASS="CHAPTER" -BGCOLOR="#FFFFFF" -TEXT="#000000" -LINK="#0000FF" -VLINK="#840084" -ALINK="#0000FF" -><DIV -CLASS="NAVHEADER" -><TABLE -SUMMARY="Header navigation table" -WIDTH="100%" -BORDER="0" -CELLPADDING="0" -CELLSPACING="0" -><TR -><TH -COLSPAN="3" -ALIGN="center" ->SAMBA Project Documentation</TH -></TR -><TR -><TD -WIDTH="10%" -ALIGN="left" -VALIGN="bottom" -><A -HREF="browsing-quick.html" -ACCESSKEY="P" ->Prev</A -></TD -><TD -WIDTH="80%" -ALIGN="center" -VALIGN="bottom" -></TD -><TD -WIDTH="10%" -ALIGN="right" -VALIGN="bottom" -><A -HREF="type.html" -ACCESSKEY="N" ->Next</A -></TD -></TR -></TABLE -><HR -ALIGN="LEFT" -WIDTH="100%"></DIV -><DIV -CLASS="CHAPTER" -><H1 -><A -NAME="PWENCRYPT">Chapter 4. LanMan and NT Password Encryption in Samba</H1 -><DIV -CLASS="SECT1" -><H1 -CLASS="SECT1" -><A -NAME="AEN457">4.1. Introduction</H1 -><P ->Newer windows clients send encrypted passwords over - the wire, instead of plain text passwords. The newest clients - will only send encrypted passwords and refuse to send plain text - passwords, unless their registry is tweaked.</P -><P ->These passwords can't be converted to unix style encrypted - passwords. Because of that you can't use the standard unix - user database, and you have to store the Lanman and NT hashes - somewhere else. For more information, see the documentation - about the <B -CLASS="COMMAND" ->passdb backend = </B -> parameter. - </P -></DIV -><DIV -CLASS="SECT1" -><H1 -CLASS="SECT1" -><A -NAME="AEN462">4.2. Important Notes About Security</H1 -><P ->The unix and SMB password encryption techniques seem similar - on the surface. This similarity is, however, only skin deep. The unix - scheme typically sends clear text passwords over the network when - logging in. This is bad. The SMB encryption scheme never sends the - cleartext password over the network but it does store the 16 byte - hashed values on disk. This is also bad. Why? Because the 16 byte hashed - values are a "password equivalent". You cannot derive the user's - password from them, but they could potentially be used in a modified - client to gain access to a server. This would require considerable - technical knowledge on behalf of the attacker but is perfectly possible. - You should thus treat the smbpasswd file as though it contained the - cleartext passwords of all your users. Its contents must be kept - secret, and the file should be protected accordingly.</P -><P ->Ideally we would like a password scheme which neither requires - plain text passwords on the net or on disk. Unfortunately this - is not available as Samba is stuck with being compatible with - other SMB systems (WinNT, WfWg, Win95 etc). </P -><DIV -CLASS="WARNING" -><P -></P -><TABLE -CLASS="WARNING" -WIDTH="100%" -BORDER="0" -><TR -><TD -WIDTH="25" -ALIGN="CENTER" -VALIGN="TOP" -><IMG -SRC="../images/warning.gif" -HSPACE="5" -ALT="Warning"></TD -><TD -ALIGN="LEFT" -VALIGN="TOP" -><P ->Note that Windows NT 4.0 Service pack 3 changed the - default for permissible authentication so that plaintext - passwords are <SPAN -CLASS="emphasis" -><I -CLASS="EMPHASIS" ->never</I -></SPAN -> sent over the wire. - The solution to this is either to switch to encrypted passwords - with Samba or edit the Windows NT registry to re-enable plaintext - passwords. See the document WinNT.txt for details on how to do - this.</P -><P ->Other Microsoft operating systems which also exhibit - this behavior includes</P -><P -></P -><UL -><LI -><P ->MS DOS Network client 3.0 with - the basic network redirector installed</P -></LI -><LI -><P ->Windows 95 with the network redirector - update installed</P -></LI -><LI -><P ->Windows 98 [se]</P -></LI -><LI -><P ->Windows 2000</P -></LI -></UL -><P -><SPAN -CLASS="emphasis" -><I -CLASS="EMPHASIS" ->Note :</I -></SPAN ->All current release of - Microsoft SMB/CIFS clients support authentication via the - SMB Challenge/Response mechanism described here. Enabling - clear text authentication does not disable the ability - of the client to participate in encrypted authentication.</P -></TD -></TR -></TABLE -></DIV -><DIV -CLASS="SECT2" -><H2 -CLASS="SECT2" -><A -NAME="AEN481">4.2.1. Advantages of SMB Encryption</H2 -><P -></P -><UL -><LI -><P ->plain text passwords are not passed across - the network. Someone using a network sniffer cannot just - record passwords going to the SMB server.</P -></LI -><LI -><P ->WinNT doesn't like talking to a server - that isn't using SMB encrypted passwords. It will refuse - to browse the server if the server is also in user level - security mode. It will insist on prompting the user for the - password on each connection, which is very annoying. The - only things you can do to stop this is to use SMB encryption. - </P -></LI -></UL -></DIV -><DIV -CLASS="SECT2" -><H2 -CLASS="SECT2" -><A -NAME="AEN488">4.2.2. Advantages of non-encrypted passwords</H2 -><P -></P -><UL -><LI -><P ->plain text passwords are not kept - on disk. </P -></LI -><LI -><P ->uses same password file as other unix - services such as login and ftp</P -></LI -><LI -><P ->you are probably already using other - services (such as telnet and ftp) which send plain text - passwords over the net, so sending them for SMB isn't - such a big deal.</P -></LI -></UL -></DIV -></DIV -><DIV -CLASS="SECT1" -><H1 -CLASS="SECT1" -><A -NAME="AEN497">4.3. The smbpasswd Command</H1 -><P ->The smbpasswd command maintains the two 32 byte password fields - in the smbpasswd file. If you wish to make it similar to the unix - <B -CLASS="COMMAND" ->passwd</B -> or <B -CLASS="COMMAND" ->yppasswd</B -> programs, - install it in <TT -CLASS="FILENAME" ->/usr/local/samba/bin/</TT -> (or your - main Samba binary directory).</P -><P -><B -CLASS="COMMAND" ->smbpasswd</B -> now works in a client-server mode - where it contacts the local smbd to change the user's password on its - behalf. This has enormous benefits - as follows.</P -><P -><B -CLASS="COMMAND" ->smbpasswd</B -> now has the capability - to change passwords on Windows NT servers (this only works when - the request is sent to the NT Primary Domain Controller if you - are changing an NT Domain user's password).</P -><P ->To run smbpasswd as a normal user just type :</P -><P -><TT -CLASS="PROMPT" ->$ </TT -><TT -CLASS="USERINPUT" -><B ->smbpasswd</B -></TT -></P -><P -><TT -CLASS="PROMPT" ->Old SMB password: </TT -><TT -CLASS="USERINPUT" -><B -><type old value here - - or hit return if there was no old password></B -></TT -></P -><P -><TT -CLASS="PROMPT" ->New SMB Password: </TT -><TT -CLASS="USERINPUT" -><B -><type new value> - </B -></TT -></P -><P -><TT -CLASS="PROMPT" ->Repeat New SMB Password: </TT -><TT -CLASS="USERINPUT" -><B -><re-type new value - </B -></TT -></P -><P ->If the old value does not match the current value stored for - that user, or the two new values do not match each other, then the - password will not be changed.</P -><P ->If invoked by an ordinary user it will only allow the user - to change his or her own Samba password.</P -><P ->If run by the root user smbpasswd may take an optional - argument, specifying the user name whose SMB password you wish to - change. Note that when run as root smbpasswd does not prompt for - or check the old password value, thus allowing root to set passwords - for users who have forgotten their passwords.</P -><P -><B -CLASS="COMMAND" ->smbpasswd</B -> is designed to work in the same way - and be familiar to UNIX users who use the <B -CLASS="COMMAND" ->passwd</B -> or - <B -CLASS="COMMAND" ->yppasswd</B -> commands.</P -><P ->For more details on using <B -CLASS="COMMAND" ->smbpasswd</B -> refer - to the man page which will always be the definitive reference.</P -></DIV -></DIV -><DIV -CLASS="NAVFOOTER" -><HR -ALIGN="LEFT" -WIDTH="100%"><TABLE -SUMMARY="Footer navigation table" -WIDTH="100%" -BORDER="0" -CELLPADDING="0" -CELLSPACING="0" -><TR -><TD -WIDTH="33%" -ALIGN="left" -VALIGN="top" -><A -HREF="browsing-quick.html" -ACCESSKEY="P" ->Prev</A -></TD -><TD -WIDTH="34%" -ALIGN="center" -VALIGN="top" -><A -HREF="samba-howto-collection.html" -ACCESSKEY="H" ->Home</A -></TD -><TD -WIDTH="33%" -ALIGN="right" -VALIGN="top" -><A -HREF="type.html" -ACCESSKEY="N" ->Next</A -></TD -></TR -><TR -><TD -WIDTH="33%" -ALIGN="left" -VALIGN="top" ->Quick Cross Subnet Browsing / Cross Workgroup Browsing guide</TD -><TD -WIDTH="34%" -ALIGN="center" -VALIGN="top" -><A -HREF="introduction.html" -ACCESSKEY="U" ->Up</A -></TD -><TD -WIDTH="33%" -ALIGN="right" -VALIGN="top" ->Type of installation</TD -></TR -></TABLE -></DIV -></BODY -></HTML ->
\ No newline at end of file |