Annotation of src/usr.bin/passwd/passwd.1, Revision 1.48
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1.48 ! naddy 32: .Dd $Mdocdate: April 14 2021 $
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.
1.13 aaron 54: A mixture of both lower and uppercase letters, numbers, and
55: meta-characters is encouraged.
1.12 provos 56: .Pp
1.18 millert 57: The quality of the password can be enforced by specifying an external
58: checking program via the
59: .Dq passwordcheck
60: variable in
61: .Xr login.conf 5 .
1.1 deraadt 62: .Pp
1.11 aaron 63: The superuser is not required to provide a user's current password
1.1 deraadt 64: if only the local password is modified.
1.4 provos 65: .Pp
1.41 tedu 66: Password encryption parameters depend on the configuration of the
67: .Dq localcipher
68: capability in
1.18 millert 69: .Xr login.conf 5 .
1.45 danj 70: If none is specified then blowfish is used, with the number of
71: rounds selected based on system performance.
1.25 jmc 72: .Sh FILES
73: .Bl -tag -width /etc/master.passwd -compact
1.43 sobrado 74: .It Pa /etc/login.conf
1.25 jmc 75: configuration options
76: .It Pa /etc/master.passwd
77: user database
78: .It Pa /etc/passwd
1.34 jmc 79: user database, with confidential information removed
1.25 jmc 80: .It Pa /etc/passwd.XXXXXX
81: temporary copy of the password file
1.43 sobrado 82: .It Pa /etc/ptmp
1.25 jmc 83: lock file for the passwd database
84: .El
1.13 aaron 85: .Sh DIAGNOSTICS
86: .Bl -diag
1.35 schwarze 87: .It "Attempting to lock password file, please wait or press ^C to abort"
1.20 millert 88: .Pp
89: The password file is currently locked by another process;
90: .Nm
91: will keep trying to lock the password file until it succeeds or
1.23 deraadt 92: you hit the interrupt character (control-C by default).
1.20 millert 93: If
94: .Nm
1.48 ! naddy 95: is interrupted while trying to gain the lock, the password change will
1.20 millert 96: be lost.
97: .Pp
1.48 ! naddy 98: If the process holding the lock was prematurely terminated, the lock
1.20 millert 99: file may be stale and
100: .Nm
101: will wait forever trying to lock the password file.
102: To determine whether a live process is actually holding the lock, the
1.18 millert 103: admin may run the following:
104: .Bd -literal -offset indent
1.22 mpech 105: $ fstat /etc/ptmp
1.18 millert 106: .Ed
107: .Pp
108: If no process is listed, it is safe to remove the
1.13 aaron 109: .Pa /etc/ptmp
1.20 millert 110: file to clear the error.
1.1 deraadt 111: .El
112: .Sh SEE ALSO
113: .Xr chpass 1 ,
1.36 tedu 114: .Xr encrypt 1 ,
1.42 millert 115: .Xr logname 1 ,
1.18 millert 116: .Xr login.conf 5 ,
1.1 deraadt 117: .Xr passwd 5 ,
118: .Xr pwd_mkdb 8 ,
119: .Xr vipw 8
120: .Rs
1.16 deraadt 121: .%A Robert Morris
122: .%A Ken Thompson
1.37 schwarze 123: .%T Password security: a case history
124: .%J Communications of the ACM
125: .%V Volume 22
126: .%N Issue 11
127: .%D Nov. 1979
1.46 schwarze 128: .%P pp. 594\(en597
1.1 deraadt 129: .Re
130: .Sh HISTORY
131: A
1.13 aaron 132: .Nm
1.1 deraadt 133: command appeared in
1.21 mickey 134: .At v3 .
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