Annotation of src/usr.bin/sudo/tgetpass.c, Revision 1.8
1.1 millert 1: /*
1.7 millert 2: * Copyright (c) 1996, 1998-2001 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 millert 3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: *
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: *
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * 3. The name of the author may not be used to endorse or promote products
17: * derived from this software without specific prior written permission.
18: *
19: * 4. Products derived from this software may not be called "Sudo" nor
20: * may "Sudo" appear in their names without specific prior written
21: * permission from the author.
22: *
23: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
24: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
25: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
26: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33: */
34:
35: #include "config.h"
36:
1.7 millert 37: #include <sys/types.h>
38: #include <sys/param.h>
39: #ifdef HAVE_SYS_BSDTYPES_H
40: # include <sys/bsdtypes.h>
41: #endif /* HAVE_SYS_BSDTYPES_H */
42: #ifdef HAVE_SYS_SELECT_H
43: # include <sys/select.h>
44: #endif /* HAVE_SYS_SELECT_H */
45: #include <sys/time.h>
1.1 millert 46: #include <stdio.h>
47: #ifdef STDC_HEADERS
1.7 millert 48: # include <stdlib.h>
49: # include <stddef.h>
50: #else
51: # ifdef HAVE_STDLIB_H
52: # include <stdlib.h>
53: # endif
1.1 millert 54: #endif /* STDC_HEADERS */
1.7 millert 55: #ifdef HAVE_STRING_H
56: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
57: # include <memory.h>
58: # endif
59: # include <string.h>
60: #else
61: # ifdef HAVE_STRINGS_H
62: # include <strings.h>
63: # endif
64: #endif /* HAVE_STRING_H */
1.1 millert 65: #ifdef HAVE_UNISTD_H
1.7 millert 66: # include <unistd.h>
1.1 millert 67: #endif /* HAVE_UNISTD_H */
68: #include <pwd.h>
69: #include <errno.h>
70: #include <signal.h>
71: #include <fcntl.h>
72: #ifdef HAVE_TERMIOS_H
1.7 millert 73: # include <termios.h>
1.1 millert 74: #else
1.7 millert 75: # ifdef HAVE_TERMIO_H
76: # include <termio.h>
77: # else
78: # include <sgtty.h>
79: # include <sys/ioctl.h>
80: # endif /* HAVE_TERMIO_H */
1.1 millert 81: #endif /* HAVE_TERMIOS_H */
82:
83: #include "sudo.h"
84:
1.5 millert 85: #ifndef lint
1.8 ! millert 86: static const char rcsid[] = "$Sudo: tgetpass.c,v 1.104 2002/12/13 18:20:34 millert Exp $";
1.5 millert 87: #endif /* lint */
88:
1.1 millert 89: #ifndef TCSASOFT
1.7 millert 90: # define TCSASOFT 0
91: #endif
92: #ifndef ECHONL
93: # define ECHONL 0
94: #endif
95:
96: #ifndef _POSIX_VDISABLE
97: # ifdef VDISABLE
98: # define _POSIX_VDISABLE VDISABLE
99: # else
100: # define _POSIX_VDISABLE 0
101: # endif
102: #endif
1.1 millert 103:
1.5 millert 104: /*
105: * Abstract method of getting at the term flags.
106: */
107: #undef TERM
108: #undef tflags
109: #ifdef HAVE_TERMIOS_H
110: # define TERM termios
111: # define tflags c_lflag
112: # define term_getattr(f, t) tcgetattr(f, t)
113: # define term_setattr(f, t) tcsetattr(f, TCSAFLUSH|TCSASOFT, t)
114: #else
115: # ifdef HAVE_TERMIO_H
116: # define TERM termio
117: # define tflags c_lflag
118: # define term_getattr(f, t) ioctl(f, TCGETA, t)
1.7 millert 119: # define term_setattr(f, t) ioctl(f, TCSETAF, t)
1.5 millert 120: # else
121: # define TERM sgttyb
122: # define tflags sg_flags
123: # define term_getattr(f, t) ioctl(f, TIOCGETP, t)
124: # define term_setattr(f, t) ioctl(f, TIOCSETP, t)
125: # endif /* HAVE_TERMIO_H */
126: #endif /* HAVE_TERMIOS_H */
1.1 millert 127:
1.7 millert 128: static volatile sig_atomic_t signo;
129:
1.1 millert 130: static char *tgetline __P((int, char *, size_t, int));
1.7 millert 131: static void handler __P((int));
1.1 millert 132:
133: /*
134: * Like getpass(3) but with timeout and echo flags.
135: */
136: char *
1.5 millert 137: tgetpass(prompt, timeout, flags)
1.1 millert 138: const char *prompt;
139: int timeout;
1.5 millert 140: int flags;
1.1 millert 141: {
1.7 millert 142: sigaction_t sa, saveint, savehup, savequit, saveterm;
143: sigaction_t savetstp, savettin, savettou;
144: static char buf[SUDO_PASS_MAX + 1];
145: int input, output, save_errno;
1.5 millert 146: struct TERM term, oterm;
1.7 millert 147: char *pass;
1.1 millert 148:
1.7 millert 149: restart:
1.1 millert 150: /* Open /dev/tty for reading/writing if possible else use stdin/stderr. */
1.5 millert 151: if ((flags & TGP_STDIN) ||
152: (input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
1.1 millert 153: input = STDIN_FILENO;
154: output = STDERR_FILENO;
155: }
156:
1.7 millert 157: /*
158: * Catch signals that would otherwise cause the user to end
159: * up with echo turned off in the shell. Don't worry about
160: * things like SIGALRM and SIGPIPE for now.
161: */
162: sigemptyset(&sa.sa_mask);
163: sa.sa_flags = 0; /* don't restart system calls */
164: sa.sa_handler = handler;
165: (void) sigaction(SIGINT, &sa, &saveint);
166: (void) sigaction(SIGHUP, &sa, &savehup);
167: (void) sigaction(SIGQUIT, &sa, &savequit);
168: (void) sigaction(SIGTERM, &sa, &saveterm);
169: (void) sigaction(SIGTSTP, &sa, &savetstp);
170: (void) sigaction(SIGTTIN, &sa, &savettin);
171: (void) sigaction(SIGTTOU, &sa, &savettou);
172:
1.5 millert 173: /* Turn echo off/on as specified by flags. */
1.7 millert 174: if (term_getattr(input, &oterm) == 0) {
175: (void) memcpy(&term, &oterm, sizeof(term));
176: if (!(flags & TGP_ECHO))
177: term.tflags &= ~(ECHO | ECHONL);
178: #ifdef VSTATUS
179: term.c_cc[VSTATUS] = _POSIX_VDISABLE;
180: #endif
181: (void) term_setattr(input, &term);
182: } else {
183: memset(&term, 0, sizeof(term));
184: memset(&oterm, 0, sizeof(oterm));
185: }
1.8 ! millert 186:
! 187: if (prompt)
! 188: (void) write(output, prompt, strlen(prompt));
1.1 millert 189:
1.7 millert 190: pass = tgetline(input, buf, sizeof(buf), timeout);
191: save_errno = errno;
1.1 millert 192:
1.7 millert 193: if (!(term.tflags & ECHO))
1.1 millert 194: (void) write(output, "\n", 1);
195:
1.7 millert 196: /* Restore old tty settings and signals. */
197: if (memcmp(&term, &oterm, sizeof(term)) != 0)
198: (void) term_setattr(input, &oterm);
199: (void) sigaction(SIGINT, &saveint, NULL);
200: (void) sigaction(SIGHUP, &savehup, NULL);
201: (void) sigaction(SIGQUIT, &savequit, NULL);
202: (void) sigaction(SIGTERM, &saveterm, NULL);
203: (void) sigaction(SIGTSTP, &savetstp, NULL);
204: (void) sigaction(SIGTTIN, &savettin, NULL);
205: (void) sigaction(SIGTTOU, &savettou, NULL);
1.1 millert 206: if (input != STDIN_FILENO)
207: (void) close(input);
208:
1.7 millert 209: /*
210: * If we were interrupted by a signal, resend it to ourselves
211: * now that we have restored the signal handlers.
212: */
213: if (signo) {
214: kill(getpid(), signo);
215: switch (signo) {
216: case SIGTSTP:
217: case SIGTTIN:
218: case SIGTTOU:
219: signo = 0;
220: goto restart;
221: }
222: }
223:
224: errno = save_errno;
225: return(pass);
1.1 millert 226: }
227:
228: /*
229: * Get a line of input (optionally timing out) and place it in buf.
230: */
231: static char *
232: tgetline(fd, buf, bufsiz, timeout)
233: int fd;
234: char *buf;
235: size_t bufsiz;
236: int timeout;
237: {
238: fd_set *readfds = NULL;
239: struct timeval tv;
1.7 millert 240: size_t left;
241: char *cp;
1.1 millert 242: char c;
1.7 millert 243: int n;
1.1 millert 244:
1.7 millert 245: if (bufsiz == 0) {
246: errno = EINVAL;
1.1 millert 247: return(NULL); /* sanity */
1.7 millert 248: }
1.1 millert 249:
1.2 millert 250: cp = buf;
251: left = bufsiz;
252:
1.1 millert 253: /*
254: * Timeout of <= 0 means no timeout.
255: */
256: if (timeout > 0) {
257: /* Setup for select(2) */
258: n = howmany(fd + 1, NFDBITS) * sizeof(fd_mask);
259: readfds = (fd_set *) emalloc(n);
260: (void) memset((VOID *)readfds, 0, n);
261:
262: /* Set timeout for select */
263: tv.tv_sec = timeout;
264: tv.tv_usec = 0;
265:
1.2 millert 266: while (--left) {
267: FD_SET(fd, readfds);
268:
269: /* Make sure there is something to read (or timeout) */
270: while ((n = select(fd + 1, readfds, 0, 0, &tv)) == -1 &&
1.7 millert 271: errno == EAGAIN)
1.2 millert 272: ;
1.7 millert 273: if (n <= 0) {
274: free(readfds);
275: return(NULL); /* timeout or interrupt */
276: }
1.2 millert 277:
278: /* Read a character, exit loop on error, EOF or EOL */
279: n = read(fd, &c, 1);
1.3 millert 280: if (n != 1 || c == '\n' || c == '\r')
1.2 millert 281: break;
282: *cp++ = c;
283: }
284: free(readfds);
285: } else {
286: /* Keep reading until out of space, EOF, error, or newline */
1.7 millert 287: n = -1;
1.4 millert 288: while (--left && (n = read(fd, &c, 1)) == 1 && c != '\n' && c != '\r')
1.2 millert 289: *cp++ = c;
1.1 millert 290: }
291: *cp = '\0';
292:
1.7 millert 293: return(n == -1 ? NULL : buf);
294: }
295:
296: static void handler(s)
297: int s;
298: {
299: signo = s;
1.1 millert 300: }
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