Line data Source code
1 : /* $OpenBSD: readpassphrase.c,v 1.22 2010/01/13 10:20:54 dtucker Exp $ */
2 :
3 : /*
4 : * Copyright (c) 2000-2002, 2007 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 : /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
24 :
25 : #include "orconfig.h"
26 :
27 : #ifndef HAVE_READPASSPHRASE
28 :
29 : #include <termios.h>
30 : #include <signal.h>
31 : #include <ctype.h>
32 : #include <fcntl.h>
33 : #include "ext/tor_readpassphrase.h"
34 : #include <errno.h>
35 : #include <string.h>
36 : #include <unistd.h>
37 :
38 : #ifndef _PATH_TTY
39 : # define _PATH_TTY "/dev/tty"
40 : #endif
41 :
42 : #ifdef TCSASOFT
43 : # define _T_FLUSH (TCSAFLUSH|TCSASOFT)
44 : #else
45 : # define _T_FLUSH (TCSAFLUSH)
46 : #endif
47 :
48 : /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
49 : #if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
50 : # define _POSIX_VDISABLE VDISABLE
51 : #endif
52 :
53 : #ifndef _NSIG
54 : # ifdef NSIG
55 : # define _NSIG NSIG
56 : # else
57 : # define _NSIG 128
58 : # endif
59 : #endif
60 :
61 : static volatile sig_atomic_t signo[_NSIG];
62 :
63 : static void handler(int);
64 :
65 : char *
66 0 : readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
67 : {
68 0 : ssize_t bytes_written = 0;
69 0 : ssize_t nr;
70 0 : int input, output, save_errno, i, need_restart;
71 0 : char ch, *p, *end;
72 0 : struct termios term, oterm;
73 0 : struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
74 0 : struct sigaction savetstp, savettin, savettou, savepipe;
75 :
76 : /* I suppose we could alloc on demand in this case (XXX). */
77 0 : if (bufsiz == 0) {
78 0 : errno = EINVAL;
79 0 : return(NULL);
80 : }
81 :
82 0 : restart:
83 0 : for (i = 0; i < _NSIG; i++)
84 0 : signo[i] = 0;
85 0 : nr = -1;
86 0 : save_errno = 0;
87 0 : need_restart = 0;
88 : /*
89 : * Read and write to /dev/tty if available. If not, read from
90 : * stdin and write to stderr unless a tty is required.
91 : */
92 0 : if ((flags & RPP_STDIN) ||
93 0 : (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
94 0 : if (flags & RPP_REQUIRE_TTY) {
95 0 : errno = ENOTTY;
96 0 : return(NULL);
97 : }
98 : input = STDIN_FILENO;
99 : output = STDERR_FILENO;
100 : }
101 :
102 : /*
103 : * Catch signals that would otherwise cause the user to end
104 : * up with echo turned off in the shell. Don't worry about
105 : * things like SIGXCPU and SIGVTALRM for now.
106 : */
107 0 : sigemptyset(&sa.sa_mask);
108 0 : sa.sa_flags = 0; /* don't restart system calls */
109 0 : sa.sa_handler = handler;
110 0 : (void)sigaction(SIGALRM, &sa, &savealrm);
111 0 : (void)sigaction(SIGHUP, &sa, &savehup);
112 0 : (void)sigaction(SIGINT, &sa, &saveint);
113 0 : (void)sigaction(SIGPIPE, &sa, &savepipe);
114 0 : (void)sigaction(SIGQUIT, &sa, &savequit);
115 0 : (void)sigaction(SIGTERM, &sa, &saveterm);
116 0 : (void)sigaction(SIGTSTP, &sa, &savetstp);
117 0 : (void)sigaction(SIGTTIN, &sa, &savettin);
118 0 : (void)sigaction(SIGTTOU, &sa, &savettou);
119 :
120 : /* Turn off echo if possible. */
121 0 : if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
122 0 : memcpy(&term, &oterm, sizeof(term));
123 0 : if (!(flags & RPP_ECHO_ON))
124 0 : term.c_lflag &= ~(ECHO | ECHONL);
125 : #ifdef VSTATUS
126 : if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
127 : term.c_cc[VSTATUS] = _POSIX_VDISABLE;
128 : #endif
129 0 : (void)tcsetattr(input, _T_FLUSH, &term);
130 : } else {
131 0 : memset(&term, 0, sizeof(term));
132 0 : term.c_lflag |= ECHO;
133 0 : memset(&oterm, 0, sizeof(oterm));
134 0 : oterm.c_lflag |= ECHO;
135 : }
136 :
137 : /* No I/O if we are already backgrounded. */
138 0 : if (signo[SIGTTOU] != 1 && signo[SIGTTIN] != 1) {
139 0 : if (!(flags & RPP_STDIN))
140 0 : bytes_written = write(output, prompt, strlen(prompt));
141 0 : end = buf + bufsiz - 1;
142 0 : p = buf;
143 0 : while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
144 0 : if (p < end) {
145 : #if 0
146 : if ((flags & RPP_SEVENBIT))
147 : ch &= 0x7f;
148 : if (isalpha(ch)) {
149 : if ((flags & RPP_FORCELOWER))
150 : ch = (char)tolower(ch);
151 : if ((flags & RPP_FORCEUPPER))
152 : ch = (char)toupper(ch);
153 : }
154 : #endif
155 0 : *p++ = ch;
156 : }
157 : }
158 0 : *p = '\0';
159 0 : save_errno = errno;
160 0 : if (!(term.c_lflag & ECHO))
161 0 : bytes_written = write(output, "\n", 1);
162 : }
163 :
164 0 : (void) bytes_written;
165 :
166 : /* Restore old terminal settings and signals. */
167 0 : if (memcmp(&term, &oterm, sizeof(term)) != 0) {
168 0 : while (tcsetattr(input, _T_FLUSH, &oterm) == -1 &&
169 0 : errno == EINTR)
170 0 : continue;
171 : }
172 0 : (void)sigaction(SIGALRM, &savealrm, NULL);
173 0 : (void)sigaction(SIGHUP, &savehup, NULL);
174 0 : (void)sigaction(SIGINT, &saveint, NULL);
175 0 : (void)sigaction(SIGQUIT, &savequit, NULL);
176 0 : (void)sigaction(SIGPIPE, &savepipe, NULL);
177 0 : (void)sigaction(SIGTERM, &saveterm, NULL);
178 0 : (void)sigaction(SIGTSTP, &savetstp, NULL);
179 0 : (void)sigaction(SIGTTIN, &savettin, NULL);
180 0 : (void)sigaction(SIGTTOU, &savettou, NULL);
181 0 : if (input != STDIN_FILENO)
182 0 : (void)close(input);
183 :
184 : /*
185 : * If we were interrupted by a signal, resend it to ourselves
186 : * now that we have restored the signal handlers.
187 : */
188 0 : for (i = 0; i < _NSIG; i++) {
189 0 : if (signo[i]) {
190 0 : kill(getpid(), i);
191 0 : switch (i) {
192 0 : case SIGTSTP:
193 : case SIGTTIN:
194 : case SIGTTOU:
195 0 : need_restart = 1;
196 : }
197 : }
198 : }
199 0 : if (need_restart)
200 0 : goto restart;
201 :
202 0 : if (save_errno)
203 0 : errno = save_errno;
204 0 : return(nr == -1 ? NULL : buf);
205 : }
206 :
207 : #if 0
208 : char *
209 : getpass(const char *prompt)
210 : {
211 : static char buf[_PASSWORD_LEN + 1];
212 :
213 : return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
214 : }
215 : #endif
216 :
217 0 : static void handler(int s)
218 : {
219 :
220 0 : signo[s] = 1;
221 0 : }
222 : #endif /* HAVE_READPASSPHRASE */
|
