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-mailto(samba@samba.org)
-
-manpage(smbpasswd htmlcommand((5)))(5)(23 Oct 1998)(Samba)(SAMBA)
-
-label(NAME)
-manpagename(smbpasswd)(The Samba encrypted password file)
-
-label(SYNOPSIS)
-manpagesynopsis()
-
-smbpasswd is the bf(Samba) encrypted password file.
-
-label(DESCRIPTION)
-manpagedescription()
-
-This file is part of the bf(Samba) suite.
-
-smbpasswd is the bf(Samba) 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.
-
-label(FILEFORMAT)
-manpagesection(FILE FORMAT)
-
-The format of the smbpasswd file used by Samba 2.0 is very similar to
-the familiar Unix bf(passwd (5)) 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:
-
-startit()
-
-label(name)
-dit(bf(name)) nl() nl()
-
- This is the user name. It must be a name that already exists
- in the standard UNIX passwd file.
-
-label(uid)
-dit(bf(uid)) nl() nl()
-
- This is the UNIX uid. It must match the uid field for the same
- user entry in the standard UNIX passwd file. If this does not
- match then Samba will refuse to recognize this bf(smbpasswd) file entry
- as being valid for a user.
-
-label(LanmanPasswordHash)
-dit(bf(Lanman Password Hash)) nl() nl()
-
- This is the em(LANMAN) hash of the users password, encoded as 32 hex
- digits. The em(LANMAN) 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 (i.e.
- the password is not em("salted") as the UNIX password is). If the
- user has a null password this field will contain the characters
- tt("NO PASSWORD") as the start of the hex string. If the hex string
- is equal to 32 tt('X') characters then the users account is marked as
- em(disabled) and the user will not be able to log onto the Samba
- server.
-
- em(WARNING !!). 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 on the network.
- For this reason these hashes are known as em("plain text equivalent")
- and must em(NOT) be made available to anyone but the root user. To
- protect these passwords the bf(smbpasswd) file is placed in a
- directory with read and traverse access only to the root user and the
- bf(smbpasswd) file itself must be set to be read/write only by root,
- with no other access.
-
-label(NTPasswordHash)
-dit(bf(NT Password Hash)) nl() nl()
-
- This is the em(Windows NT) hash of the users password, encoded as 32
- hex digits. The em(Windows NT) hash is created by taking the users
- password as represented in 16-bit, little-endian UNICODE and then
- applying the em(MD4) (internet rfc1321) hashing algorithm to it.
-
- This password hash is considered more secure than the link(bf(Lanman
- Password Hash))(LanmanPasswordHash) 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 (i.e. the password is not em("salted") as the
- UNIX password is).
-
- em(WARNING !!). 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 on the network.
- For this reason these hashes are known as em("plain text equivalent")
- and must em(NOT) be made available to anyone but the root user. To
- protect these passwords the bf(smbpasswd) file is placed in a
- directory with read and traverse access only to the root user and the
- bf(smbpasswd) file itself must be set to be read/write only by root,
- with no other access.
-
-label(AccountFlags)
-dit(bf(Account Flags)) nl() nl()
-
- This section contains flags that describe the attributes of the users
- account. In the bf(Samba2.0) release this field is bracketed by tt('[')
- and tt(']') characters and is always 13 characters in length (including
- the tt('[') and tt(']') characters). The contents of this field may be
- any of the characters.
-
- startit()
-
- label(capU)
- it() bf('U') This means this is a em("User") account, i.e. an ordinary
- user. Only bf(User) and link(bf(Workstation Trust))(capW) accounts are
- currently supported in the bf(smbpasswd) file.
-
- label(capN)
- it() bf('N') This means the account has em(no) password (the passwords
- in the fields link(bf(Lanman Password Hash))(LanmanPasswordHash) and
- link(bf(NT Password Hash))(NTPasswordHash) are ignored). Note that this
- will only allow users to log on with no password if the
- url(bf(null passwords))(smb.conf.5.html#nullpasswords) parameter is set
- in the url(bf(smb.conf (5)))(smb.conf.5.html) config file.
-
- label(capD)
- it() bf('D') This means the account is disabled and no SMB/CIFS logins
- will be allowed for this user.
-
- label(capW)
- it() bf('W') This means this account is a em("Workstation Trust") 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.
-
- endit()
-
- Other flags may be added as the code is extended in future. The rest of
- this field space is filled in with spaces.
-
-label(LastChangeTime)
-dit(bf(Last Change Time)) nl() nl()
-
- This field consists of the time the account was last modified. It consists of
- the characters tt(LCT-) (standing for em("Last Change Time")) followed by a numeric
- encoding of the UNIX time in seconds since the epoch (1970) that the last change
- was made.
-
-dit(bf(Following fields)) nl() nl()
-
- All other colon separated fields are ignored at this time.
-
-enddit()
-
-label(NOTES)
-manpagesection(NOTES)
-
-In previous versions of Samba (notably the 1.9.18 series) this file
-did not contain the link(bf(Account Flags))(AccountFlags) or
-link(bf(Last Change Time))(LastChangeTime) 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
-url(bf(smbpasswd (8)))(smbpasswd.8.html) will contain the new fields
-in the added accounts however. Thus an older bf(smbpasswd) file used
-with Samba 2.0 may end up with some accounts containing the new fields
-and some not.
-
-In order to convert from an old-style bf(smbpasswd) file to a new
-style, run the script bf(convert_smbpasswd), installed in the
-Samba tt(bin/) directory (the same place that the url(bf(smbd))(smbd.8.html)
-and url(bf(nmbd))(nmbd.8.html) binaries are installed) as follows:
-
-verb(
-
- cat old_smbpasswd_file | convert_smbpasswd > new_smbpasswd_file
-
-)
-
-The bf(convert_smbpasswd) script reads from stdin and writes to stdout
-so as not to overwrite any files by accident.
-
-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 bf(awk)), and then replace the tt(<old smbpasswd file>)
-with the tt(<new smbpasswd file>).
-
-label(VERSION)
-manpagesection(VERSION)
-
-This man page is correct for version 2.0 of the Samba suite.
-
-label(SEEALSO)
-manpageseealso()
-
-url(bf(smbpasswd (8)))(smbpasswd.8.html), url(bf(samba
-(7)))(samba.7.html), and the Internet RFC1321 for details on the MD4
-algorithm.
-
-label(AUTHOR)
-manpageauthor()
-
-The original Samba software and related utilities were created by
-Andrew Tridgell email(samba@samba.org). Samba is now developed
-by the Samba Team as an Open Source project similar to the way the
-Linux kernel is developed.
-
-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, available at
-url(bf(ftp://ftp.icce.rug.nl/pub/unix/))(ftp://ftp.icce.rug.nl/pub/unix/))
-and updated for the Samba2.0 release by Jeremy
-Allison, email(samba@samba.org).
-
-See url(bf(samba (7)))(samba.7.html) to find out how to get a full
-list of contributors and details on how to submit bug reports,
-comments etc.