1/* $OpenBSD: readpassphrase.c,v 1.16 2003/06/17 21:56:23 millert Exp $ */
2
3/*
4 * Copyright (c) 2000-2002 Todd C. Miller <Todd.Miller@courtesan.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 *
18 * Sponsored in part by the Defense Advanced Research Projects
19 * Agency (DARPA) and Air Force Research Laboratory, Air Force
20 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
21 */
22
23#if defined(LIBC_SCCS) && !defined(lint)
24static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.16 2003/06/17 21:56:23 millert Exp $";
25#endif /* LIBC_SCCS and not lint */
26
27#include "includes.h"
28
29#ifndef HAVE_READPASSPHRASE
30
31#include <termios.h>
32#include <readpassphrase.h>
33
34#ifdef TCSASOFT
35# define _T_FLUSH (TCSAFLUSH|TCSASOFT)
36#else
37# define _T_FLUSH (TCSAFLUSH)
38#endif
39
40/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
41#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
42# define _POSIX_VDISABLE VDISABLE
43#endif
44
45static volatile sig_atomic_t signo;
46
47static void handler(int);
48
49char *
50readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
51{
52 ssize_t nr;
53 int input, output, save_errno;
54 char ch, *p, *end;
55 struct termios term, oterm;
56 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
57 struct sigaction savetstp, savettin, savettou, savepipe;
58
59 /* I suppose we could alloc on demand in this case (XXX). */
60 if (bufsiz == 0) {
61 errno = EINVAL;
62 return(NULL);
63 }
64
65restart:
66 signo = 0;
67 /*
68 * Read and write to /dev/tty if available. If not, read from
69 * stdin and write to stderr unless a tty is required.
70 */
71 if ((flags & RPP_STDIN) ||
72 (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
73 if (flags & RPP_REQUIRE_TTY) {
74 errno = ENOTTY;
75 return(NULL);
76 }
77 input = STDIN_FILENO;
78 output = STDERR_FILENO;
79 }
80
81 /*
82 * Catch signals that would otherwise cause the user to end
83 * up with echo turned off in the shell. Don't worry about
84 * things like SIGXCPU and SIGVTALRM for now.
85 */
86 sigemptyset(&sa.sa_mask);
87 sa.sa_flags = 0; /* don't restart system calls */
88 sa.sa_handler = handler;
89 (void)sigaction(SIGALRM, &sa, &savealrm);
90 (void)sigaction(SIGHUP, &sa, &savehup);
91 (void)sigaction(SIGINT, &sa, &saveint);
92 (void)sigaction(SIGPIPE, &sa, &savepipe);
93 (void)sigaction(SIGQUIT, &sa, &savequit);
94 (void)sigaction(SIGTERM, &sa, &saveterm);
95 (void)sigaction(SIGTSTP, &sa, &savetstp);
96 (void)sigaction(SIGTTIN, &sa, &savettin);
97 (void)sigaction(SIGTTOU, &sa, &savettou);
98
99 /* Turn off echo if possible. */
100 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
101 memcpy(&term, &oterm, sizeof(term));
102 if (!(flags & RPP_ECHO_ON))
103 term.c_lflag &= ~(ECHO | ECHONL);
104#ifdef VSTATUS
105 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
106 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
107#endif
108 (void)tcsetattr(input, _T_FLUSH, &term);
109 } else {
110 memset(&term, 0, sizeof(term));
111 term.c_lflag |= ECHO;
112 memset(&oterm, 0, sizeof(oterm));
113 oterm.c_lflag |= ECHO;
114 }
115
116 if (!(flags & RPP_STDIN))
117 (void)write(output, prompt, strlen(prompt));
118 end = buf + bufsiz - 1;
119 for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) {
120 if (p < end) {
121 if ((flags & RPP_SEVENBIT))
122 ch &= 0x7f;
123 if (isalpha(ch)) {
124 if ((flags & RPP_FORCELOWER))
125 ch = tolower(ch);
126 if ((flags & RPP_FORCEUPPER))
127 ch = toupper(ch);
128 }
129 *p++ = ch;
130 }
131 }
132 *p = '\0';
133 save_errno = errno;
134 if (!(term.c_lflag & ECHO))
135 (void)write(output, "\n", 1);
136
137 /* Restore old terminal settings and signals. */
138 if (memcmp(&term, &oterm, sizeof(term)) != 0)
139 (void)tcsetattr(input, _T_FLUSH, &oterm);
140 (void)sigaction(SIGALRM, &savealrm, NULL);
141 (void)sigaction(SIGHUP, &savehup, NULL);
142 (void)sigaction(SIGINT, &saveint, NULL);
143 (void)sigaction(SIGQUIT, &savequit, NULL);
144 (void)sigaction(SIGPIPE, &savepipe, NULL);
145 (void)sigaction(SIGTERM, &saveterm, NULL);
146 (void)sigaction(SIGTSTP, &savetstp, NULL);
147 (void)sigaction(SIGTTIN, &savettin, NULL);
148 if (input != STDIN_FILENO)
149 (void)close(input);
150
151 /*
152 * If we were interrupted by a signal, resend it to ourselves
153 * now that we have restored the signal handlers.
154 */
155 if (signo) {
156 kill(getpid(), signo);
157 switch (signo) {
158 case SIGTSTP:
159 case SIGTTIN:
160 case SIGTTOU:
161 goto restart;
162 }
163 }
164
165 errno = save_errno;
166 return(nr == -1 ? NULL : buf);
167}
168
169#if 0
170char *
171getpass(const char *prompt)
172{
173 static char buf[_PASSWORD_LEN + 1];
174
175 return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
176}
177#endif
178
179static void handler(int s)
180{
181
182 signo = s;
183}
184#endif /* HAVE_READPASSPHRASE */
| 3/* $OpenBSD: readpassphrase.c,v 1.16 2003/06/17 21:56:23 millert Exp $ */
4
5/*
6 * Copyright (c) 2000-2002 Todd C. Miller <Todd.Miller@courtesan.com>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 *
20 * Sponsored in part by the Defense Advanced Research Projects
21 * Agency (DARPA) and Air Force Research Laboratory, Air Force
22 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
23 */
24
25#if defined(LIBC_SCCS) && !defined(lint)
26static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.16 2003/06/17 21:56:23 millert Exp $";
27#endif /* LIBC_SCCS and not lint */
28
29#include "includes.h"
30
31#ifndef HAVE_READPASSPHRASE
32
33#include <termios.h>
34#include <readpassphrase.h>
35
36#ifdef TCSASOFT
37# define _T_FLUSH (TCSAFLUSH|TCSASOFT)
38#else
39# define _T_FLUSH (TCSAFLUSH)
40#endif
41
42/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
43#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
44# define _POSIX_VDISABLE VDISABLE
45#endif
46
47static volatile sig_atomic_t signo;
48
49static void handler(int);
50
51char *
52readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
53{
54 ssize_t nr;
55 int input, output, save_errno;
56 char ch, *p, *end;
57 struct termios term, oterm;
58 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
59 struct sigaction savetstp, savettin, savettou, savepipe;
60
61 /* I suppose we could alloc on demand in this case (XXX). */
62 if (bufsiz == 0) {
63 errno = EINVAL;
64 return(NULL);
65 }
66
67restart:
68 signo = 0;
69 /*
70 * Read and write to /dev/tty if available. If not, read from
71 * stdin and write to stderr unless a tty is required.
72 */
73 if ((flags & RPP_STDIN) ||
74 (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
75 if (flags & RPP_REQUIRE_TTY) {
76 errno = ENOTTY;
77 return(NULL);
78 }
79 input = STDIN_FILENO;
80 output = STDERR_FILENO;
81 }
82
83 /*
84 * Catch signals that would otherwise cause the user to end
85 * up with echo turned off in the shell. Don't worry about
86 * things like SIGXCPU and SIGVTALRM for now.
87 */
88 sigemptyset(&sa.sa_mask);
89 sa.sa_flags = 0; /* don't restart system calls */
90 sa.sa_handler = handler;
91 (void)sigaction(SIGALRM, &sa, &savealrm);
92 (void)sigaction(SIGHUP, &sa, &savehup);
93 (void)sigaction(SIGINT, &sa, &saveint);
94 (void)sigaction(SIGPIPE, &sa, &savepipe);
95 (void)sigaction(SIGQUIT, &sa, &savequit);
96 (void)sigaction(SIGTERM, &sa, &saveterm);
97 (void)sigaction(SIGTSTP, &sa, &savetstp);
98 (void)sigaction(SIGTTIN, &sa, &savettin);
99 (void)sigaction(SIGTTOU, &sa, &savettou);
100
101 /* Turn off echo if possible. */
102 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
103 memcpy(&term, &oterm, sizeof(term));
104 if (!(flags & RPP_ECHO_ON))
105 term.c_lflag &= ~(ECHO | ECHONL);
106#ifdef VSTATUS
107 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
108 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
109#endif
110 (void)tcsetattr(input, _T_FLUSH, &term);
111 } else {
112 memset(&term, 0, sizeof(term));
113 term.c_lflag |= ECHO;
114 memset(&oterm, 0, sizeof(oterm));
115 oterm.c_lflag |= ECHO;
116 }
117
118 if (!(flags & RPP_STDIN))
119 (void)write(output, prompt, strlen(prompt));
120 end = buf + bufsiz - 1;
121 for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) {
122 if (p < end) {
123 if ((flags & RPP_SEVENBIT))
124 ch &= 0x7f;
125 if (isalpha(ch)) {
126 if ((flags & RPP_FORCELOWER))
127 ch = tolower(ch);
128 if ((flags & RPP_FORCEUPPER))
129 ch = toupper(ch);
130 }
131 *p++ = ch;
132 }
133 }
134 *p = '\0';
135 save_errno = errno;
136 if (!(term.c_lflag & ECHO))
137 (void)write(output, "\n", 1);
138
139 /* Restore old terminal settings and signals. */
140 if (memcmp(&term, &oterm, sizeof(term)) != 0)
141 (void)tcsetattr(input, _T_FLUSH, &oterm);
142 (void)sigaction(SIGALRM, &savealrm, NULL);
143 (void)sigaction(SIGHUP, &savehup, NULL);
144 (void)sigaction(SIGINT, &saveint, NULL);
145 (void)sigaction(SIGQUIT, &savequit, NULL);
146 (void)sigaction(SIGPIPE, &savepipe, NULL);
147 (void)sigaction(SIGTERM, &saveterm, NULL);
148 (void)sigaction(SIGTSTP, &savetstp, NULL);
149 (void)sigaction(SIGTTIN, &savettin, NULL);
150 if (input != STDIN_FILENO)
151 (void)close(input);
152
153 /*
154 * If we were interrupted by a signal, resend it to ourselves
155 * now that we have restored the signal handlers.
156 */
157 if (signo) {
158 kill(getpid(), signo);
159 switch (signo) {
160 case SIGTSTP:
161 case SIGTTIN:
162 case SIGTTOU:
163 goto restart;
164 }
165 }
166
167 errno = save_errno;
168 return(nr == -1 ? NULL : buf);
169}
170
171#if 0
172char *
173getpass(const char *prompt)
174{
175 static char buf[_PASSWORD_LEN + 1];
176
177 return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
178}
179#endif
180
181static void handler(int s)
182{
183
184 signo = s;
185}
186#endif /* HAVE_READPASSPHRASE */
|