Line data Source code
1 : /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
2 :
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)
26 : static 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 <config.h>
30 :
31 : #ifndef HAVE_READPASSPHRASE
32 :
33 : #include <stdarg.h>
34 : #include <stdio.h>
35 :
36 : #ifdef HAVE_STDLIB_H
37 : #include <stdlib.h>
38 : #endif
39 :
40 : #ifdef HAVE_STRING_H
41 : #include <string.h>
42 : #endif
43 :
44 : #include <ctype.h>
45 :
46 : #ifdef HAVE_UNISTD_H
47 : #include <unistd.h>
48 : #endif
49 :
50 : #ifdef HAVE_SIGNAL_H
51 : #include <signal.h>
52 : #endif
53 :
54 : #ifdef HAVE_ERRNO_H
55 : #include <errno.h>
56 : #endif
57 :
58 : #ifdef HAVE_SYS_TYPES_H
59 : #include <sys/types.h>
60 : #endif
61 :
62 : #ifdef HAVE_SYS_STAT_H
63 : #include <sys/stat.h>
64 : #endif
65 :
66 : #include <fcntl.h>
67 :
68 : #ifdef HAVE_PATHS_H
69 : #include <paths.h> /* For _PATH_XXX */
70 : #endif
71 :
72 : #include <freetds/replacements/readpassphrase.h>
73 :
74 : #if !defined(_WIN32) && !defined(_WIN64)
75 : #include <termios.h>
76 :
77 : #ifndef _PATH_TTY
78 : # define _PATH_TTY "/dev/tty"
79 : #endif
80 :
81 : #ifdef TCSASOFT
82 : # define _T_FLUSH (TCSAFLUSH|TCSASOFT)
83 : #else
84 : # define _T_FLUSH (TCSAFLUSH)
85 : #endif
86 :
87 : /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
88 : #if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
89 : # define _POSIX_VDISABLE VDISABLE
90 : #endif
91 :
92 : static volatile sig_atomic_t signo;
93 :
94 : static void handler(int);
95 :
96 : char *
97 0 : tds_readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
98 : {
99 : ssize_t nr;
100 : int input, output, save_errno;
101 : char ch, *p, *end;
102 : struct termios term, oterm;
103 : struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
104 : struct sigaction savetstp, savettin, savettou, savepipe;
105 :
106 : /* I suppose we could alloc on demand in this case (XXX). */
107 0 : if (bufsiz == 0) {
108 0 : errno = EINVAL;
109 0 : return(NULL);
110 : }
111 :
112 0 : restart:
113 0 : signo = 0;
114 : /*
115 : * Read and write to /dev/tty if available. If not, read from
116 : * stdin and write to stderr unless a tty is required.
117 : */
118 0 : if ((flags & RPP_STDIN) ||
119 0 : (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
120 0 : if (flags & RPP_REQUIRE_TTY) {
121 0 : errno = ENOTTY;
122 0 : return(NULL);
123 : }
124 : input = STDIN_FILENO;
125 : output = STDERR_FILENO;
126 : }
127 :
128 : /*
129 : * Catch signals that would otherwise cause the user to end
130 : * up with echo turned off in the shell. Don't worry about
131 : * things like SIGXCPU and SIGVTALRM for now.
132 : */
133 0 : sigemptyset(&sa.sa_mask);
134 0 : sa.sa_flags = 0; /* don't restart system calls */
135 0 : sa.sa_handler = handler;
136 0 : (void)sigaction(SIGALRM, &sa, &savealrm);
137 0 : (void)sigaction(SIGHUP, &sa, &savehup);
138 0 : (void)sigaction(SIGINT, &sa, &saveint);
139 0 : (void)sigaction(SIGPIPE, &sa, &savepipe);
140 0 : (void)sigaction(SIGQUIT, &sa, &savequit);
141 0 : (void)sigaction(SIGTERM, &sa, &saveterm);
142 0 : (void)sigaction(SIGTSTP, &sa, &savetstp);
143 0 : (void)sigaction(SIGTTIN, &sa, &savettin);
144 0 : (void)sigaction(SIGTTOU, &sa, &savettou);
145 :
146 : /* Turn off echo if possible. */
147 0 : if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
148 0 : memcpy(&term, &oterm, sizeof(term));
149 0 : if (!(flags & RPP_ECHO_ON))
150 0 : term.c_lflag &= ~(ECHO | ECHONL);
151 : #ifdef VSTATUS
152 : if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
153 : term.c_cc[VSTATUS] = _POSIX_VDISABLE;
154 : #endif
155 0 : (void)tcsetattr(input, _T_FLUSH, &term);
156 : } else {
157 0 : memset(&term, 0, sizeof(term));
158 0 : term.c_lflag |= ECHO;
159 0 : memset(&oterm, 0, sizeof(oterm));
160 0 : oterm.c_lflag |= ECHO;
161 : }
162 :
163 0 : if (!(flags & RPP_STDIN))
164 0 : (void)write(output, prompt, strlen(prompt));
165 0 : end = buf + bufsiz - 1;
166 0 : for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) {
167 0 : if (p < end) {
168 0 : if ((flags & RPP_SEVENBIT))
169 0 : ch &= 0x7f;
170 0 : if (isalpha((unsigned char) ch)) {
171 0 : if ((flags & RPP_FORCELOWER))
172 0 : ch = tolower((unsigned char) ch);
173 0 : if ((flags & RPP_FORCEUPPER))
174 0 : ch = toupper((unsigned char) ch);
175 : }
176 0 : *p++ = ch;
177 : }
178 : }
179 0 : *p = '\0';
180 0 : save_errno = errno;
181 0 : if (!(term.c_lflag & ECHO))
182 0 : (void)write(output, "\n", 1);
183 :
184 : /* Restore old terminal settings and signals. */
185 0 : if (memcmp(&term, &oterm, sizeof(term)) != 0)
186 0 : (void)tcsetattr(input, _T_FLUSH, &oterm);
187 0 : (void)sigaction(SIGALRM, &savealrm, NULL);
188 0 : (void)sigaction(SIGHUP, &savehup, NULL);
189 0 : (void)sigaction(SIGINT, &saveint, NULL);
190 0 : (void)sigaction(SIGQUIT, &savequit, NULL);
191 0 : (void)sigaction(SIGPIPE, &savepipe, NULL);
192 0 : (void)sigaction(SIGTERM, &saveterm, NULL);
193 0 : (void)sigaction(SIGTSTP, &savetstp, NULL);
194 0 : (void)sigaction(SIGTTIN, &savettin, NULL);
195 0 : if (input != STDIN_FILENO)
196 0 : (void)close(input);
197 :
198 : /*
199 : * If we were interrupted by a signal, resend it to ourselves
200 : * now that we have restored the signal handlers.
201 : */
202 0 : if (signo) {
203 0 : kill(getpid(), signo);
204 0 : switch (signo) {
205 : case SIGTSTP:
206 : case SIGTTIN:
207 : case SIGTTOU:
208 : goto restart;
209 : }
210 : }
211 :
212 0 : errno = save_errno;
213 0 : return(nr == -1 ? NULL : buf);
214 : }
215 :
216 : #if 0
217 : char *
218 : getpass(const char *prompt)
219 : {
220 : static char buf[_PASSWORD_LEN + 1];
221 :
222 : return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
223 : }
224 : #endif
225 :
226 0 : static void handler(int s)
227 : {
228 :
229 0 : signo = s;
230 0 : }
231 :
232 : #else /* _WIN32 */
233 :
234 : char *
235 : tds_readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
236 : {
237 : int save_errno, ch;
238 : char *p, *end;
239 :
240 : /* I suppose we could alloc on demand in this case (XXX). */
241 : if (bufsiz == 0) {
242 : errno = EINVAL;
243 : return(NULL);
244 : }
245 :
246 : printf("%s", prompt);
247 : fflush(stdout);
248 : end = buf + bufsiz - 1;
249 : for (p = buf; (ch = getchar()) != EOF && ch != '\n' && ch != '\r';) {
250 : if (p < end) {
251 : ch &= 0xff;
252 : if ((flags & RPP_SEVENBIT))
253 : ch &= 0x7f;
254 : if (isalpha(ch)) {
255 : if ((flags & RPP_FORCELOWER))
256 : ch = tolower(ch);
257 : if ((flags & RPP_FORCEUPPER))
258 : ch = toupper(ch);
259 : }
260 : *p++ = ch;
261 : }
262 : }
263 : *p = '\0';
264 : save_errno = errno;
265 : printf("\n");
266 : errno = save_errno;
267 : return (ch == EOF ? NULL : buf);
268 : }
269 :
270 : #endif /* _WIN32 */
271 :
272 : #endif /* HAVE_READPASSPHRASE */
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