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21f4052c5b
groff(1) has changed the internal layout for the .Lb doc strings, but to preserve backwards compatibility we cannot simply rename them, we need to create new aliases so that these will work with old and new macros. Signed-off-by: Guillem Jover <guillem@hadrons.org>
175 lines
4.9 KiB
Plaintext
175 lines
4.9 KiB
Plaintext
.\" $OpenBSD: readpassphrase.3,v 1.20 2014/03/06 23:03:18 millert Exp $
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.\"
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.\" Copyright (c) 2000, 2002 Todd C. Miller <Todd.Miller@courtesan.com>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" Sponsored in part by the Defense Advanced Research Projects
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.\" Agency (DARPA) and Air Force Research Laboratory, Air Force
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.\" Materiel Command, USAF, under agreement number F39502-99-1-0512.
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.\"
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.Dd $Mdocdate: March 6 2014 $
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.Dt READPASSPHRASE 3bsd
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.Os
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.Sh NAME
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.Nm readpassphrase
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.Nd get a passphrase from the user
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.Sh LIBRARY
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.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
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.ds doc-str-Lb-libbsd \*[str-Lb-libbsd]
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.Lb libbsd
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.Sh SYNOPSIS
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.In readpassphrase.h
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(See
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.Xr libbsd 7
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for include usage.)
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.Ft char *
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.Fn readpassphrase "const char *prompt" "char *buf" "size_t bufsiz" "int flags"
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.Sh DESCRIPTION
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The
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.Fn readpassphrase
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function displays a prompt to, and reads in a passphrase from,
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.Pa /dev/tty .
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If this file is inaccessible
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and the
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.Dv RPP_REQUIRE_TTY
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flag is not set,
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.Fn readpassphrase
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displays the prompt on the standard error output and reads from the standard
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input.
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In this case it is generally not possible to turn off echo.
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.Pp
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Up to
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.Fa bufsiz
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- 1 characters (one is for the NUL) are read into the provided buffer
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.Fa buf .
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Any additional
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characters and the terminating newline (or return) character are discarded.
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.Pp
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The
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.Fa flags
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argument is the bitwise
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.Tn OR
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of zero or more of the following values:
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.Bd -literal -offset indent
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RPP_ECHO_OFF turn off echo (default behavior)
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RPP_ECHO_ON leave echo on
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RPP_REQUIRE_TTY fail if there is no tty
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RPP_FORCELOWER force input to lower case
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RPP_FORCEUPPER force input to upper case
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RPP_SEVENBIT strip the high bit from input
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RPP_STDIN read passphrase from stdin; ignore prompt
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.Ed
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.Pp
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The calling process should zero the passphrase as soon as possible to
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avoid leaving the cleartext passphrase visible in the process's address
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space.
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn readpassphrase
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returns a pointer to the NUL-terminated passphrase.
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If an error is encountered, the terminal state is restored and
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a null pointer is returned.
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.Sh FILES
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.Bl -tag -width /dev/tty -compact
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.It Pa /dev/tty
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.El
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.Sh EXAMPLES
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The following code fragment will read a passphrase from
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.Pa /dev/tty
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into the buffer
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.Fa passbuf .
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.Bd -literal -offset indent
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char passbuf[1024];
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\&...
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if (readpassphrase("Response: ", passbuf, sizeof(passbuf),
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RPP_REQUIRE_TTY) == NULL)
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errx(1, "unable to read passphrase");
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if (compare(transform(passbuf), epass) != 0)
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errx(1, "bad passphrase");
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\&...
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explicit_bzero(passbuf, sizeof(passbuf));
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.Ed
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EINTR
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The
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.Fn readpassphrase
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function was interrupted by a signal.
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.It Bq Er EINVAL
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The
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.Ar bufsiz
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argument was zero.
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.It Bq Er EIO
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The process is a member of a background process attempting to read
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from its controlling terminal, the process is ignoring or blocking
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the
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.Dv SIGTTIN
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signal, or the process group is orphaned.
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.It Bq Er EMFILE
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The process has already reached its limit for open file descriptors.
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.It Bq Er ENFILE
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The system file table is full.
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.It Bq Er ENOTTY
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There is no controlling terminal and the
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.Dv RPP_REQUIRE_TTY
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flag was specified.
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.El
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.Sh SIGNALS
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.Fn readpassphrase
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will catch the following signals:
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.Bd -literal -offset indent
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SIGALRM SIGHUP SIGINT
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SIGPIPE SIGQUIT SIGTERM
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SIGTSTP SIGTTIN SIGTTOU
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.Ed
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.Pp
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When one of the above signals is intercepted, terminal echo will
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be restored if it had previously been turned off.
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If a signal handler was installed for the signal when
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.Fn readpassphrase
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was called, that handler is then executed.
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If no handler was previously installed for the signal then the
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default action is taken as per
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.Xr sigaction 2 .
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.Pp
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The
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.Dv SIGTSTP ,
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.Dv SIGTTIN ,
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and
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.Dv SIGTTOU
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signals (stop signals generated from keyboard or due to terminal I/O
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from a background process) are treated specially.
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When the process is resumed after it has been stopped,
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.Fn readpassphrase
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will reprint the prompt and the user may then enter a passphrase.
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.Sh SEE ALSO
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.Xr sigaction 2 ,
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.Xr getpass 3
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.Sh STANDARDS
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The
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.Fn readpassphrase
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function is an
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.Ox
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extension and should not be used if portability is desired.
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.Sh HISTORY
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The
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.Fn readpassphrase
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function first appeared in
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.Ox 2.9 .
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