Annotation of src/usr.bin/passwd/passwd.1, Revision 1.10
1.10 ! deraadt 1: .\" $OpenBSD: passwd.1,v 1.9 2000/03/10 20:17:49 aaron Exp $
1.9 aaron 2: .\"
1.1 deraadt 3: .\" Copyright (c) 1990 The Regents of the University of California.
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34: .\" from: @(#)passwd.1 6.11 (Berkeley) 7/24/91
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36: .Dd July 24, 1991
37: .Dt PASSWD 1
1.8 aaron 38: .Os
1.1 deraadt 39: .Sh NAME
40: .Nm passwd
41: .Nd modify a user's password
42: .Sh SYNOPSIS
43: .Nm passwd
44: .Op Fl l
1.5 art 45: .Op Fl y
1.1 deraadt 46: .Op Fl k
1.5 art 47: .Op Fl n Ar name
48: .Op Fl i Ar instance
49: .Op Fl r Ar realm
50: .Op Fl u Ar username[.instance][@realm]
1.1 deraadt 51: .Op Ar user
1.5 art 52: .\" This should really be: passwd [-l] [-y] [-k [-n name] [-i instance] [-r realm] [-u username[.instance][@realm]]] [user]
1.1 deraadt 53: .Sh DESCRIPTION
1.7 aaron 54: .Nm passwd
1.9 aaron 55: changes the user's local, Kerberos, or YP password.
56: First, the user is prompted for their current password.
1.1 deraadt 57: If the current password is correctly typed, a new password is
58: requested.
59: The new password must be entered twice to avoid typing errors.
60: .Pp
61: The new password should be at least six characters long and not
62: purely alphabetic.
63: Its total length must be less than
64: .Dv _PASSWORD_LEN
65: (currently 128 characters).
1.7 aaron 66: Numbers, upper case letters and meta-characters
1.1 deraadt 67: are encouraged.
1.9 aaron 68: .Pp
69: The options are as follows:
1.1 deraadt 70: .Bl -tag -width flag
71: .It Fl l
1.7 aaron 72: Causes the password to be updated only in the local
1.9 aaron 73: password file.
74: When changing only the local password,
75: .Xr pwd_mkdb 8
1.1 deraadt 76: is used to update the password databases.
1.6 art 77: .It Fl y
1.7 aaron 78: Forces the YP password database entry to be changed, even if
1.9 aaron 79: the user has an entry in the local database.
80: The
1.6 art 81: .Xr rpc.yppasswdd 8
82: daemon should be running on the YP master server.
1.1 deraadt 83: .It Fl k
1.7 aaron 84: Forces the change to affect the Kerberos database, even
1.1 deraadt 85: if the user has a password in the local database.
86: Once the password has been verified,
87: .Nm passwd
88: communicates the new password information to
89: the Kerberos authenticating host.
1.6 art 90: .El
91: .Pp
1.8 aaron 92: The following flags are only used when the
1.6 art 93: .Fl k
1.7 aaron 94: flag is specified:
1.6 art 95: .Bl -tag -width flag
1.7 aaron 96: .It Fl n Ar name
1.8 aaron 97: Specifies a
1.7 aaron 98: .Ar name
1.9 aaron 99: that will be used as the principal name rather than the username
1.6 art 100: of the user running
1.7 aaron 101: .Nm passwd .
1.9 aaron 102: (This is determined from the ticket file if it exists; otherwise,
1.7 aaron 103: it is determined from the Unix user ID.)
104: .It Fl i Ar instance
1.8 aaron 105: Specifies an
106: .Ar instance
1.6 art 107: to use rather than a null instance.
1.7 aaron 108: .It Fl r Ar realm
109: Specifies a
110: .Ar realm
1.6 art 111: instead of the local realm.
1.7 aaron 112: .It Fl u Ar username[.instance][@realm]
1.9 aaron 113: Specifies a fully qualified Kerberos principal.
1.1 deraadt 114: .El
115: .Pp
116: This is the behavior if no flags are specified:
117: if Kerberos is active then
118: .Nm passwd
119: will talk to the Kerberos server (even if the user has an entry
1.7 aaron 120: in the local database).
1.1 deraadt 121: If the password is not in the local password database, then
122: an attempt is made to use the YP database.
123: .Pp
124: To change another user's Kerberos password, one must first
125: run
126: .Xr kinit 1
127: followed by
128: .Xr passwd 1 .
129: The super-user is not required to provide a user's current password
130: if only the local password is modified.
1.4 provos 131: .Pp
132: Which type of cipher is used to encrypt the password information
133: depends on the configuration in
1.8 aaron 134: .Xr passwd.conf 5 .
1.4 provos 135: It can be different for local and YP passwords.
1.1 deraadt 136: .Sh FILES
137: .Bl -tag -width /etc/master.passwd -compact
138: .It Pa /etc/master.passwd
1.7 aaron 139: user database
1.8 aaron 140: .It Pa /etc/passwd
1.7 aaron 141: a Version 7 format password file
1.1 deraadt 142: .It Pa /etc/passwd.XXXXXX
1.7 aaron 143: temporary copy of the password file
1.4 provos 144: .It /etc/passwd.conf
1.7 aaron 145: configuration options
1.1 deraadt 146: .El
147: .Sh SEE ALSO
148: .Xr chpass 1 ,
149: .Xr kerberos 1 ,
150: .Xr kinit 1 ,
151: .Xr login 1 ,
152: .Xr passwd 5 ,
1.4 provos 153: .Xr passwd.conf 5 ,
1.1 deraadt 154: .Xr pwd_mkdb 8 ,
155: .Xr vipw 8
156: .Rs
157: .%A Robert Morris
158: .%A Ken Thompson
159: .%T "UNIX password security"
160: .Re
161: .Sh HISTORY
162: A
163: .Nm passwd
164: command appeared in
165: .At v6 .
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