mirror of
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398 lines
11 KiB
C
398 lines
11 KiB
C
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/* $OpenBSD: ui_openssl.c,v 1.25 2015/09/10 15:56:26 jsing Exp $ */
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/* Written by Richard Levitte (richard@levitte.org) and others
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* for the OpenSSL project 2001.
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*/
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/* ====================================================================
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* Copyright (c) 2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* The lowest level part of this file was previously in crypto/des/read_pwd.c,
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* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <sys/ioctl.h>
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#include <openssl/opensslconf.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include "ui_locl.h"
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#ifndef NX509_SIG
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#define NX509_SIG 32
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#endif
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/* Define globals. They are protected by a lock */
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static struct sigaction savsig[NX509_SIG];
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static struct termios tty_orig;
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static FILE *tty_in, *tty_out;
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static int is_a_tty;
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/* Declare static functions */
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static int read_till_nl(FILE *);
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static void recsig(int);
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static void pushsig(void);
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static void popsig(void);
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static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl);
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static int read_string(UI *ui, UI_STRING *uis);
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static int write_string(UI *ui, UI_STRING *uis);
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static int open_console(UI *ui);
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static int echo_console(UI *ui);
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static int noecho_console(UI *ui);
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static int close_console(UI *ui);
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static UI_METHOD ui_openssl = {
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.name = "OpenSSL default user interface",
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.ui_open_session = open_console,
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.ui_write_string = write_string,
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.ui_read_string = read_string,
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.ui_close_session = close_console,
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};
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/* The method with all the built-in thingies */
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UI_METHOD *
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UI_OpenSSL(void)
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{
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return &ui_openssl;
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}
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/* The following function makes sure that info and error strings are printed
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before any prompt. */
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static int
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write_string(UI *ui, UI_STRING *uis)
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{
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switch (UI_get_string_type(uis)) {
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case UIT_ERROR:
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case UIT_INFO:
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fputs(UI_get0_output_string(uis), tty_out);
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fflush(tty_out);
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break;
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default:
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break;
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}
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return 1;
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}
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static int
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read_string(UI *ui, UI_STRING *uis)
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{
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int ok = 0;
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switch (UI_get_string_type(uis)) {
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case UIT_BOOLEAN:
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fputs(UI_get0_output_string(uis), tty_out);
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fputs(UI_get0_action_string(uis), tty_out);
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fflush(tty_out);
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return read_string_inner(ui, uis,
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UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 0);
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case UIT_PROMPT:
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fputs(UI_get0_output_string(uis), tty_out);
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fflush(tty_out);
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return read_string_inner(ui, uis,
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UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1);
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case UIT_VERIFY:
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fprintf(tty_out, "Verifying - %s",
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UI_get0_output_string(uis));
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fflush(tty_out);
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if ((ok = read_string_inner(ui, uis, UI_get_input_flags(uis) &
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UI_INPUT_FLAG_ECHO, 1)) <= 0)
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return ok;
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if (strcmp(UI_get0_result_string(uis),
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UI_get0_test_string(uis)) != 0) {
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fprintf(tty_out, "Verify failure\n");
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fflush(tty_out);
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return 0;
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}
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break;
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default:
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break;
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}
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return 1;
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}
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/* Internal functions to read a string without echoing */
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static int
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read_till_nl(FILE *in)
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{
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#define SIZE 4
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char buf[SIZE + 1];
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do {
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if (!fgets(buf, SIZE, in))
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return 0;
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} while (strchr(buf, '\n') == NULL);
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return 1;
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}
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static volatile sig_atomic_t intr_signal;
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static int
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read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl)
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{
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static int ps;
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int ok;
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char result[BUFSIZ];
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int maxsize = BUFSIZ - 1;
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char *p;
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intr_signal = 0;
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ok = 0;
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ps = 0;
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pushsig();
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ps = 1;
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if (!echo && !noecho_console(ui))
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goto error;
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ps = 2;
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result[0] = '\0';
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p = fgets(result, maxsize, tty_in);
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if (!p)
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goto error;
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if (feof(tty_in))
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goto error;
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if (ferror(tty_in))
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goto error;
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if ((p = strchr(result, '\n')) != NULL) {
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if (strip_nl)
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*p = '\0';
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} else if (!read_till_nl(tty_in))
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goto error;
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if (UI_set_result(ui, uis, result) >= 0)
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ok = 1;
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error:
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if (intr_signal == SIGINT)
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ok = -1;
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if (!echo)
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fprintf(tty_out, "\n");
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if (ps >= 2 && !echo && !echo_console(ui))
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ok = 0;
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if (ps >= 1)
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popsig();
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explicit_bzero(result, BUFSIZ);
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return ok;
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}
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/* Internal functions to open, handle and close a channel to the console. */
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static int
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open_console(UI *ui)
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{
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CRYPTO_w_lock(CRYPTO_LOCK_UI);
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is_a_tty = 1;
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#define DEV_TTY "/dev/tty"
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if ((tty_in = fopen(DEV_TTY, "r")) == NULL)
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tty_in = stdin;
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if ((tty_out = fopen(DEV_TTY, "w")) == NULL)
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tty_out = stderr;
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if (tcgetattr(fileno(tty_in), &tty_orig) == -1) {
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if (errno == ENOTTY)
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is_a_tty = 0;
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else
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/*
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* Ariel Glenn ariel@columbia.edu reports that
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* solaris can return EINVAL instead. This should be
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* ok
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*/
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if (errno == EINVAL)
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is_a_tty = 0;
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else
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return 0;
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}
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return 1;
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}
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static int
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noecho_console(UI *ui)
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{
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struct termios tty_new = tty_orig;
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tty_new.c_lflag &= ~ECHO;
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if (is_a_tty && (tcsetattr(fileno(tty_in), TCSANOW, &tty_new) == -1))
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return 0;
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return 1;
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}
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static int
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echo_console(UI *ui)
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{
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if (is_a_tty && (tcsetattr(fileno(tty_in), TCSANOW, &tty_orig) == -1))
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return 0;
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return 1;
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}
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static int
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close_console(UI *ui)
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{
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if (tty_in != stdin)
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fclose(tty_in);
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if (tty_out != stderr)
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fclose(tty_out);
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CRYPTO_w_unlock(CRYPTO_LOCK_UI);
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return 1;
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}
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/* Internal functions to handle signals and act on them */
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static void
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pushsig(void)
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{
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int i;
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struct sigaction sa;
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memset(&sa, 0, sizeof sa);
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sa.sa_handler = recsig;
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for (i = 1; i < NX509_SIG; i++) {
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if (i == SIGUSR1)
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continue;
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if (i == SIGUSR2)
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continue;
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if (i == SIGKILL) /* We can't make any action on that. */
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continue;
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sigaction(i, &sa, &savsig[i]);
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}
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signal(SIGWINCH, SIG_DFL);
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}
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static void
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popsig(void)
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{
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int i;
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for (i = 1; i < NX509_SIG; i++) {
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if (i == SIGUSR1)
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continue;
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if (i == SIGUSR2)
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continue;
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sigaction(i, &savsig[i], NULL);
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}
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}
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static void
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recsig(int i)
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{
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intr_signal = i;
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}
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