Annotation of src/usr.bin/passwd/passwd.1, Revision 1.44
1.44 ! deraadt 1: .\" $OpenBSD: passwd.1,v 1.43 2015/07/27 17:28:39 sobrado Exp $
1.9 aaron 2: .\"
1.1 deraadt 3: .\" Copyright (c) 1990 The Regents of the University of California.
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1.44 ! deraadt 32: .Dd $Mdocdate: July 27 2015 $
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
40: .Op Ar user
41: .Sh DESCRIPTION
1.13 aaron 42: .Nm
1.44 ! deraadt 43: changes the user's password.
1.42 millert 44: If no
45: .Ar user
46: is specified, the user's login name is used (see
47: .Xr logname 1 ) .
1.9 aaron 48: First, the user is prompted for their current password.
1.13 aaron 49: If the current password is correctly typed, a new password is requested.
1.1 deraadt 50: The new password must be entered twice to avoid typing errors.
51: .Pp
52: The new password should be at least six characters long and not
53: purely alphabetic.
54: Its total length must be less than
55: .Dv _PASSWORD_LEN
56: (currently 128 characters).
1.13 aaron 57: A mixture of both lower and uppercase letters, numbers, and
58: meta-characters is encouraged.
1.12 provos 59: .Pp
1.18 millert 60: The quality of the password can be enforced by specifying an external
61: checking program via the
62: .Dq passwordcheck
63: variable in
64: .Xr login.conf 5 .
1.1 deraadt 65: .Pp
1.11 aaron 66: The superuser is not required to provide a user's current password
1.1 deraadt 67: if only the local password is modified.
1.4 provos 68: .Pp
1.41 tedu 69: Password encryption parameters depend on the configuration of the
70: .Dq localcipher
71: capability in
1.18 millert 72: .Xr login.conf 5 .
1.41 tedu 73: If none is specified, then blowfish with 8 rounds is used.
1.25 jmc 74: .Sh FILES
75: .Bl -tag -width /etc/master.passwd -compact
1.43 sobrado 76: .It Pa /etc/login.conf
1.25 jmc 77: configuration options
78: .It Pa /etc/master.passwd
79: user database
80: .It Pa /etc/passwd
1.34 jmc 81: user database, with confidential information removed
1.25 jmc 82: .It Pa /etc/passwd.XXXXXX
83: temporary copy of the password file
1.43 sobrado 84: .It Pa /etc/ptmp
1.25 jmc 85: lock file for the passwd database
86: .El
1.13 aaron 87: .Sh DIAGNOSTICS
88: .Bl -diag
1.35 schwarze 89: .It "Attempting to lock password file, please wait or press ^C to abort"
1.20 millert 90: .Pp
91: The password file is currently locked by another process;
92: .Nm
93: will keep trying to lock the password file until it succeeds or
1.23 deraadt 94: you hit the interrupt character (control-C by default).
1.20 millert 95: If
96: .Nm
1.35 schwarze 97: is interrupted while trying to gain the lock the password change will
1.20 millert 98: be lost.
99: .Pp
100: If the process holding the lock was prematurely terminated the lock
101: file may be stale and
102: .Nm
103: will wait forever trying to lock the password file.
104: To determine whether a live process is actually holding the lock, the
1.18 millert 105: admin may run the following:
106: .Bd -literal -offset indent
1.22 mpech 107: $ fstat /etc/ptmp
1.18 millert 108: .Ed
109: .Pp
110: If no process is listed, it is safe to remove the
1.13 aaron 111: .Pa /etc/ptmp
1.20 millert 112: file to clear the error.
1.1 deraadt 113: .El
114: .Sh SEE ALSO
115: .Xr chpass 1 ,
1.36 tedu 116: .Xr encrypt 1 ,
1.42 millert 117: .Xr logname 1 ,
1.18 millert 118: .Xr login.conf 5 ,
1.1 deraadt 119: .Xr passwd 5 ,
120: .Xr pwd_mkdb 8 ,
121: .Xr vipw 8
122: .Rs
1.16 deraadt 123: .%A Robert Morris
124: .%A Ken Thompson
1.37 schwarze 125: .%T Password security: a case history
126: .%J Communications of the ACM
127: .%V Volume 22
128: .%N Issue 11
129: .%D Nov. 1979
130: .%P 594\(en597
1.1 deraadt 131: .Re
132: .Sh HISTORY
133: A
1.13 aaron 134: .Nm
1.1 deraadt 135: command appeared in
1.21 mickey 136: .At v3 .
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