Annotation of src/usr.bin/passwd/passwd.1, Revision 1.42
1.42 ! millert 1: .\" $OpenBSD: passwd.1,v 1.41 2014/11/02 05:25:09 tedu Exp $
1.9 aaron 2: .\"
1.1 deraadt 3: .\" Copyright (c) 1990 The Regents of the University of California.
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1.42 ! millert 32: .Dd $Mdocdate: November 2 2014 $
1.1 deraadt 33: .Dt PASSWD 1
1.8 aaron 34: .Os
1.1 deraadt 35: .Sh NAME
36: .Nm passwd
37: .Nd modify a user's password
38: .Sh SYNOPSIS
39: .Nm passwd
1.40 jmc 40: .Op Fl l | y
1.1 deraadt 41: .Op Ar user
42: .Sh DESCRIPTION
1.13 aaron 43: .Nm
1.39 tedu 44: changes the user's local or YP password.
1.42 ! millert 45: If no
! 46: .Ar user
! 47: is specified, the user's login name is used (see
! 48: .Xr logname 1 ) .
1.9 aaron 49: First, the user is prompted for their current password.
1.13 aaron 50: If the current password is correctly typed, a new password is requested.
1.1 deraadt 51: The new password must be entered twice to avoid typing errors.
52: .Pp
53: The new password should be at least six characters long and not
54: purely alphabetic.
55: Its total length must be less than
56: .Dv _PASSWORD_LEN
57: (currently 128 characters).
1.13 aaron 58: A mixture of both lower and uppercase letters, numbers, and
59: meta-characters is encouraged.
1.12 provos 60: .Pp
1.18 millert 61: The quality of the password can be enforced by specifying an external
62: checking program via the
63: .Dq passwordcheck
64: variable in
65: .Xr login.conf 5 .
1.9 aaron 66: .Pp
67: The options are as follows:
1.14 aaron 68: .Bl -tag -width Ds
1.1 deraadt 69: .It Fl l
1.13 aaron 70: Causes the password to be updated only in the local password file.
1.9 aaron 71: When changing only the local password,
72: .Xr pwd_mkdb 8
1.1 deraadt 73: is used to update the password databases.
1.6 art 74: .It Fl y
1.7 aaron 75: Forces the YP password database entry to be changed, even if
1.9 aaron 76: the user has an entry in the local database.
77: The
1.6 art 78: .Xr rpc.yppasswdd 8
79: daemon should be running on the YP master server.
80: .El
81: .Pp
1.39 tedu 82: If no flags are specified and the password is not in the local password
83: database, then an attempt is made to use the YP database.
1.1 deraadt 84: .Pp
1.11 aaron 85: The superuser is not required to provide a user's current password
1.1 deraadt 86: if only the local password is modified.
1.4 provos 87: .Pp
1.41 tedu 88: Password encryption parameters depend on the configuration of the
89: .Dq localcipher
90: capability in
1.18 millert 91: .Xr login.conf 5 .
1.41 tedu 92: If none is specified, then blowfish with 8 rounds is used.
1.25 jmc 93: .Sh FILES
94: .Bl -tag -width /etc/master.passwd -compact
95: .It /etc/login.conf
96: configuration options
97: .It Pa /etc/master.passwd
98: user database
99: .It Pa /etc/passwd
1.34 jmc 100: user database, with confidential information removed
1.25 jmc 101: .It Pa /etc/passwd.XXXXXX
102: temporary copy of the password file
103: .It /etc/ptmp
104: lock file for the passwd database
105: .El
1.13 aaron 106: .Sh DIAGNOSTICS
107: .Bl -diag
1.35 schwarze 108: .It "Attempting to lock password file, please wait or press ^C to abort"
1.20 millert 109: .Pp
110: The password file is currently locked by another process;
111: .Nm
112: will keep trying to lock the password file until it succeeds or
1.23 deraadt 113: you hit the interrupt character (control-C by default).
1.20 millert 114: If
115: .Nm
1.35 schwarze 116: is interrupted while trying to gain the lock the password change will
1.20 millert 117: be lost.
118: .Pp
119: If the process holding the lock was prematurely terminated the lock
120: file may be stale and
121: .Nm
122: will wait forever trying to lock the password file.
123: To determine whether a live process is actually holding the lock, the
1.18 millert 124: admin may run the following:
125: .Bd -literal -offset indent
1.22 mpech 126: $ fstat /etc/ptmp
1.18 millert 127: .Ed
128: .Pp
129: If no process is listed, it is safe to remove the
1.13 aaron 130: .Pa /etc/ptmp
1.20 millert 131: file to clear the error.
1.1 deraadt 132: .El
133: .Sh SEE ALSO
134: .Xr chpass 1 ,
1.36 tedu 135: .Xr encrypt 1 ,
1.42 ! millert 136: .Xr logname 1 ,
1.18 millert 137: .Xr login.conf 5 ,
1.1 deraadt 138: .Xr passwd 5 ,
139: .Xr pwd_mkdb 8 ,
140: .Xr vipw 8
141: .Rs
1.16 deraadt 142: .%A Robert Morris
143: .%A Ken Thompson
1.37 schwarze 144: .%T Password security: a case history
145: .%J Communications of the ACM
146: .%V Volume 22
147: .%N Issue 11
148: .%D Nov. 1979
149: .%P 594\(en597
1.1 deraadt 150: .Re
151: .Sh HISTORY
152: A
1.13 aaron 153: .Nm
1.1 deraadt 154: command appeared in
1.21 mickey 155: .At v3 .
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