Annotation of src/usr.bin/passwd/passwd.1, Revision 1.12
1.12 ! provos 1: .\" $OpenBSD: passwd.1,v 1.11 2000/04/15 11:45:55 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.
1.12 ! provos 68: .Pp
! 69: The quality of the password can be enforced by providing an external
! 70: checking program in
! 71: .Xr passwd.conf 5 .
1.9 aaron 72: .Pp
73: The options are as follows:
1.1 deraadt 74: .Bl -tag -width flag
75: .It Fl l
1.7 aaron 76: Causes the password to be updated only in the local
1.9 aaron 77: password file.
78: When changing only the local password,
79: .Xr pwd_mkdb 8
1.1 deraadt 80: is used to update the password databases.
1.6 art 81: .It Fl y
1.7 aaron 82: Forces the YP password database entry to be changed, even if
1.9 aaron 83: the user has an entry in the local database.
84: The
1.6 art 85: .Xr rpc.yppasswdd 8
86: daemon should be running on the YP master server.
1.1 deraadt 87: .It Fl k
1.7 aaron 88: Forces the change to affect the Kerberos database, even
1.1 deraadt 89: if the user has a password in the local database.
90: Once the password has been verified,
91: .Nm passwd
92: communicates the new password information to
93: the Kerberos authenticating host.
1.6 art 94: .El
95: .Pp
1.8 aaron 96: The following flags are only used when the
1.6 art 97: .Fl k
1.7 aaron 98: flag is specified:
1.6 art 99: .Bl -tag -width flag
1.7 aaron 100: .It Fl n Ar name
1.8 aaron 101: Specifies a
1.7 aaron 102: .Ar name
1.9 aaron 103: that will be used as the principal name rather than the username
1.6 art 104: of the user running
1.7 aaron 105: .Nm passwd .
1.9 aaron 106: (This is determined from the ticket file if it exists; otherwise,
1.7 aaron 107: it is determined from the Unix user ID.)
108: .It Fl i Ar instance
1.8 aaron 109: Specifies an
110: .Ar instance
1.6 art 111: to use rather than a null instance.
1.7 aaron 112: .It Fl r Ar realm
113: Specifies a
114: .Ar realm
1.6 art 115: instead of the local realm.
1.7 aaron 116: .It Fl u Ar username[.instance][@realm]
1.9 aaron 117: Specifies a fully qualified Kerberos principal.
1.1 deraadt 118: .El
119: .Pp
120: This is the behavior if no flags are specified:
121: if Kerberos is active then
122: .Nm passwd
123: will talk to the Kerberos server (even if the user has an entry
1.7 aaron 124: in the local database).
1.1 deraadt 125: If the password is not in the local password database, then
126: an attempt is made to use the YP database.
127: .Pp
128: To change another user's Kerberos password, one must first
129: run
130: .Xr kinit 1
131: followed by
132: .Xr passwd 1 .
1.11 aaron 133: The superuser is not required to provide a user's current password
1.1 deraadt 134: if only the local password is modified.
1.4 provos 135: .Pp
136: Which type of cipher is used to encrypt the password information
137: depends on the configuration in
1.8 aaron 138: .Xr passwd.conf 5 .
1.4 provos 139: It can be different for local and YP passwords.
1.1 deraadt 140: .Sh FILES
141: .Bl -tag -width /etc/master.passwd -compact
142: .It Pa /etc/master.passwd
1.7 aaron 143: user database
1.8 aaron 144: .It Pa /etc/passwd
1.7 aaron 145: a Version 7 format password file
1.1 deraadt 146: .It Pa /etc/passwd.XXXXXX
1.7 aaron 147: temporary copy of the password file
1.4 provos 148: .It /etc/passwd.conf
1.7 aaron 149: configuration options
1.1 deraadt 150: .El
151: .Sh SEE ALSO
152: .Xr chpass 1 ,
153: .Xr kerberos 1 ,
154: .Xr kinit 1 ,
155: .Xr login 1 ,
156: .Xr passwd 5 ,
1.4 provos 157: .Xr passwd.conf 5 ,
1.1 deraadt 158: .Xr pwd_mkdb 8 ,
159: .Xr vipw 8
160: .Rs
161: .%A Robert Morris
162: .%A Ken Thompson
163: .%T "UNIX password security"
164: .Re
165: .Sh HISTORY
166: A
167: .Nm passwd
168: command appeared in
169: .At v6 .
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