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| author | Jeremy Allison <jra@samba.org> | 1998-11-11 01:23:43 +0000 |
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| committer | Jeremy Allison <jra@samba.org> | 1998-11-11 01:23:43 +0000 |
| commit | 8f5f0bffc6af97e1f382cb3baa03ccecb0f151c4 (patch) | |
| tree | 4ee441688d4da3ad72947407932121819c86122d /docs/htmldocs/smbpasswd.5.html | |
| parent | f04c2b4deeaee7360b5757de8eb7cb019d886e46 (diff) | |
| download | samba-8f5f0bffc6af97e1f382cb3baa03ccecb0f151c4.tar.gz samba-8f5f0bffc6af97e1f382cb3baa03ccecb0f151c4.tar.xz samba-8f5f0bffc6af97e1f382cb3baa03ccecb0f151c4.zip | |
First version of HTML docs generated from YODL source.
Jeremy.
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| -rw-r--r-- | docs/htmldocs/smbpasswd.5.html | 191 |
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diff --git a/docs/htmldocs/smbpasswd.5.html b/docs/htmldocs/smbpasswd.5.html new file mode 100644 index 00000000000..35649e689bc --- /dev/null +++ b/docs/htmldocs/smbpasswd.5.html @@ -0,0 +1,191 @@ + + + + + +<html><head><title>smbpasswd</title> + +<link rev="made" href="mailto:samba-bugs@samba.anu.edu.au"> +</head> +<body> + +<hr> + +<h1>smbpasswd</h1> +<h2>Samba</h2> +<h2>23 Oct 1998</h2> + + + + +<p><br><a name="NAME"></a> +<h2>NAME</h2> + smbpasswd - The Samba encrypted password file +<p><br><a name="SYNOPSIS"></a> +<h2>SYNOPSIS</h2> + +<p><br>smbpasswd is the <strong>Samba</strong> encrypted password file. +<p><br><a name="DESCRIPTION"></a> +<h2>DESCRIPTION</h2> + +<p><br>This file is part of the <strong>Samba</strong> suite. +<p><br>smbpasswd is the <strong>Samba</strong> encrypted password file. It contains +the username, unix user id and the SMB hashed passwords of the +user, as well as account flag information and the time the password +was last changed. This file format has been evolving with Samba +and has had several different formats in the past. +<p><br><a name="FILEFORMAT"></a> +<h2>FILE FORMAT</h2> + +<p><br>The format of the smbpasswd file used by Samba 2.0 is very similar to +the familiar unix <strong>passwd (5)</strong> file. It is an ASCII file containing +one line for each user. Each field within each line is separated from +the next by a colon. Any entry beginning with # is ignored. The +smbpasswd file contains the following information for each user: +<p><br><ul> +<p><br><a name="name"></a> +<li><strong><strong>name</strong></strong> <br> <br> +<p><br>This is the user name. It must be a name that already exists + in the standard UNIX passwd file. +<p><br><a name="uid"></a> +<li><strong><strong>uid</strong></strong> <br> <br> +<p><br>This is the UNIX uid. It must match the uid field for the same + user entry in the standard UNIX passwd file. +<p><br><a name="LanmanPasswordHash"></a> +<li><strong><strong>Lanman Password Hash</strong></strong> <br> <br> +<p><br>This is the <em>LANMAN</em> hash of the users password, encoded as 32 hex + digits. The <em>LANMAN</em> hash is created by DES encrypting a well known + string with the users password as the DES key. This is the same + password used by Windows 95/98 machines. Note that this password hash + is regarded as weak as it is vulnerable to dictionary attacks and if + two users choose the same password this entry will be identical (ie. + the password is not <em>"salted"</em> as the UNIX password is). If the + user has a null password this field will contain the characters + <code>"NO PASSWORD"</code> as the start of the hex string. If the hex string + is equal to 32 <code>'X'</code> characters then the users account is marked as + <em>disabled</em> and the user will not be able to log onto the Samba + server. +<p><br><em>WARNING !!</em>. Note that, due to the challenge-response nature of the + SMB/CIFS authentication protocol, anyone with a knowledge of this + password hash will be able to impersonate the user of the network. + For this reason these hashes are known as <em>"plain text equivalent"</em> + and must <em>NOT</em> be made available to anyone but the root user. To + protect these passwords the <strong>smbpasswd</strong> file is placed in a + directory with read and traverse access only to the root user and the + <strong>smbpasswd</strong> file itself must be set to be read/write only by root, + with no other access. +<p><br><a name="NTPasswordHash"></a> +<li><strong><strong>NT Password Hash</strong></strong> <br> <br> +<p><br>This is the <em>Windows NT</em> hash of the users password, encoded as 32 + hex digits. The <em>Windows NT</em> hash is created by taking the users + password as represented in 16-bit, little-endian UNICODE and then + applying the <em>MD4</em> (internet rfc1321) hashing algorithm to it. +<p><br>This password hash is considered more secure than the <a href="smbpasswd.5.html#LanmanPasswordHash"><strong>Lanman + Password Hash</strong></a> as it preserves the case of the + password and uses a much higher quality hashing algorithm. However, it + is still the case that if two users choose the same password this + entry will be identical (ie. the password is not <em>"salted"</em> as the + UNIX password is). +<p><br><em>WARNING !!</em>. Note that, due to the challenge-response nature of the + SMB/CIFS authentication protocol, anyone with a knowledge of this + password hash will be able to impersonate the user of the network. + For this reason these hashes are known as <em>"plain text equivalent"</em> + and must <em>NOT</em> be made available to anyone but the root user. To + protect these passwords the <strong>smbpasswd</strong> file is placed in a + directory with read and traverse access only to the root user and the + <strong>smbpasswd</strong> file itself must be set to be read/write only by root, + with no other access. +<p><br><a name="AccountFlags"></a> +<li><strong><strong>Account Flags</strong></strong> <br> <br> +<p><br>This section contains flags that describe the attributes of the users + account. In the <strong>Samba2.0</strong> release this field is bracketed by <code>'['</code> + and <code>']'</code> characters and is always 13 characters in length (including + the <code>'['</code> and <code>']'</code> characters). The contents of this field may be + any of the characters. +<p><br><ul> +<p><br><a name="capU"></a> + <li > <strong>'U'</strong> This means this is a <em>"User"</em> account, ie. an ordinary + user. Only <strong>User</strong> and <a href="smbpasswd.5.html#capW"><strong>Worskstation Trust</strong></a> accounts are + currently supported in the <strong>smbpasswd</strong> file. +<p><br><a name="capN"></a> + <li > <strong>'N'</strong> This means the account has <em>no</em> password (the passwords + in the fields <a href="smbpasswd.5.html#LanmanPasswordHash"><strong>Lanman Password Hash</strong></a> and + <a href="smbpasswd.5.html#NTPasswordHash"><strong>NT Password Hash</strong></a> are ignored). Note that this + will only allow users to log on with no password if the + <a href="smb.conf.5.html#nullpasswords"><strong>null passwords</strong></a> parameter is set + in the <a href="smb.conf.5.html"><strong>smb.conf (5)</strong></a> config file. +<p><br><a name="capD"></a> + <li > <strong>'D'</strong> This means the account is diabled and no SMB/CIFS logins + will be allowed for this user. +<p><br><a name="capW"></a> + <li > <strong>'W'</strong> This means this account is a <em>"Workstation Trust"</em> account. + This kind of account is used in the Samba PDC code stream to allow Windows + NT Workstations and Servers to join a Domain hosted by a Samba PDC. +<p><br></ul> +<p><br>Other flags may be added as the code is extended in future. The rest of + this field space is filled in with spaces. +<p><br><a name="LastChangeTime"></a> +<li><strong><strong>Last Change Time</strong></strong> <br> <br> +<p><br>This field consists of the time the account was last modified. It consists of + the characters <code>LCT-</code> (standing for <em>"Last Change Time"</em>) followed by a numeric + encoding of the UNIX time in seconds since the epoch (1970) that the last change + was made. +<p><br><li><strong><strong>Following fields</strong></strong> <br> <br> +<p><br>All other colon separated fields are ignored at this time. +<p><br></ul> +<p><br><a name="NOTES"></a> +<h2>NOTES</h2> + +<p><br>In previous versions of Samba (notably the 1.9.18 series) this file +did not contain the <a href="smbpasswd.5.html#AccountFlags"><strong>Account Flags</strong></a> or +<a href="smbpasswd.5.html#LastChangeTime"><strong>Last Change Time</strong></a> fields. The Samba 2.0 +code will read and write these older password files but will not be able to +modify the old entries to add the new fields. New entries added with +<a href="smbpasswd.8.html"><strong>smbpasswd (8)</strong></a> will contain the new fields +in the added accounts however. Thus an older <strong>smbpasswd</strong> file used +with Samba 2.0 may end up with some accounts containing the new fields +and some not. +<p><br>In order to convert from an old-style <strong>smbpasswd</strong> file to a new +style, run the script <strong>convert_smbpasswd</strong>, installed in the +Samba <code>bin/</code> directory (the same place that the <a href="smbd.8.html"><strong>smbd</strong></a> +and <a href="nmbd.8.html"><strong>nmbd</strong></a> binaries are installed) as follows: +<p><br><pre> + + + cat old_smbpasswd_file | convert_smbpasswd > new_smbpasswd_file + + +</pre> + +<p><br>The <strong>convert_smbpasswd</strong> script reads from stdin and writes to stdout +so as not to overwrite any files by accident. +<p><br>Once this script has been run, check the contents of the new smbpasswd +file to ensure that it has not been damaged by the conversion script +(which uses <strong>awk</strong>), and then replace the <code><old smbpasswd file></code> +with the <code><new smbpasswd file></code>. +<p><br><a name="VERSION"></a> +<h2>VERSION</h2> + +<p><br>This man page is correct for version 2.0 of the Samba suite. +<p><br><a name="SEEALSO"></a> +<h2>SEE ALSO</h2> + +<p><br><a href="smbpasswd.8.html"><strong>smbpasswd (8)</strong></a>, <a href="samba.7.html"><strong>samba +(7)</strong></a>, and the Internet RFC1321 for details on the MD4 +algorithm. +<p><br><a name="AUTHOR"></a> +<h2>AUTHOR</h2> + +<p><br>The original Samba software and related utilities were created by +Andrew Tridgell (samba-bugs@samba.anu.edu.au). Samba is now developed +by the Samba Team as an Open Source project similar to the way the +Linux kernel is developed. +<p><br>The original Samba man pages were written by Karl Auer. The man page +sources were converted to YODL format (another excellent piece of Open +Source software) and updated for the Samba2.0 release by Jeremy +Allison, <a href="mailto:samba-bugs@samba.anu.edu.au"><em>samba-bugs@samba.anu.edu.au</em></a>. +<p><br>See <a href="samba.7.html"><strong>samba (7)</strong></a> to find out how to get a full +list of contributors and details on how to submit bug reports, +comments etc. +</body> +</html> |