/*
- * Copyright (c) 1996, 1998-2001 Todd C. Miller <Todd.Miller@courtesan.com>
- * All rights reserved.
+ * Copyright (c) 1996, 1998-2005, 2007-2008
+ * Todd C. Miller <Todd.Miller@courtesan.com>
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
*
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * 4. Products derived from this software may not be called "Sudo" nor
- * may "Sudo" appear in their names without specific prior written
- * permission from the author.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
-#include "config.h"
+#ifdef __TANDEM
+# include <floss.h>
+#endif
+
+#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#ifdef HAVE_SYS_BSDTYPES_H
# include <sys/bsdtypes.h>
#endif /* HAVE_SYS_BSDTYPES_H */
-#ifdef HAVE_SYS_SELECT_H
-# include <sys/select.h>
-#endif /* HAVE_SYS_SELECT_H */
#include <sys/time.h>
#include <stdio.h>
#ifdef STDC_HEADERS
#include "sudo.h"
#ifndef lint
-static const char rcsid[] = "$Sudo: tgetpass.c,v 1.103 2001/12/17 23:56:47 millert Exp $";
+__unused static const char rcsid[] = "$Sudo: tgetpass.c,v 1.126 2008/12/09 20:55:49 millert Exp $";
#endif /* lint */
#ifndef TCSASOFT
#endif
/*
- * Abstract method of getting at the term flags.
+ * Compat macros for non-termios systems.
*/
-#undef TERM
-#undef tflags
-#ifdef HAVE_TERMIOS_H
-# define TERM termios
-# define tflags c_lflag
-# define term_getattr(f, t) tcgetattr(f, t)
-# define term_setattr(f, t) tcsetattr(f, TCSAFLUSH|TCSASOFT, t)
-#else
+#ifndef HAVE_TERMIOS_H
# ifdef HAVE_TERMIO_H
-# define TERM termio
-# define tflags c_lflag
-# define term_getattr(f, t) ioctl(f, TCGETA, t)
-# define term_setattr(f, t) ioctl(f, TCSETAF, t)
+# undef termios
+# define termios termio
+# define tcgetattr(f, t) ioctl(f, TCGETA, t)
+# define tcsetattr(f, a, t) ioctl(f, a, t)
+# undef TCSAFLUSH
+# define TCSAFLUSH TCSETAF
# else
-# define TERM sgttyb
-# define tflags sg_flags
-# define term_getattr(f, t) ioctl(f, TIOCGETP, t)
-# define term_setattr(f, t) ioctl(f, TIOCSETP, t)
+# undef termios
+# define termios sgttyb
+# define c_lflag sg_flags
+# define tcgetattr(f, t) ioctl(f, TIOCGETP, t)
+# define tcsetattr(f, a, t) ioctl(f, a, t)
+# undef TCSAFLUSH
+# define TCSAFLUSH TIOCSETP
# endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
static volatile sig_atomic_t signo;
-static char *tgetline __P((int, char *, size_t, int));
static void handler __P((int));
+static char *getln __P((int, char *, size_t));
+static char *sudo_askpass __P((const char *));
/*
* Like getpass(3) but with timeout and echo flags.
int timeout;
int flags;
{
- sigaction_t sa, saveint, savehup, savequit, saveterm;
+ sigaction_t sa, savealrm, saveint, savehup, savequit, saveterm;
sigaction_t savetstp, savettin, savettou;
+ struct termios term, oterm;
+ char *pass;
static char buf[SUDO_PASS_MAX + 1];
int input, output, save_errno;
- struct TERM term, oterm;
- char *pass;
+
+ (void) fflush(stdout);
+
+ /* If using a helper program to get the password, run it instead. */
+ if (ISSET(flags, TGP_ASKPASS) && user_askpass)
+ return(sudo_askpass(prompt));
restart:
+ signo = 0;
+ pass = NULL;
+ save_errno = 0;
/* Open /dev/tty for reading/writing if possible else use stdin/stderr. */
- if ((flags & TGP_STDIN) ||
+ if (ISSET(flags, TGP_STDIN) ||
(input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
input = STDIN_FILENO;
output = STDERR_FILENO;
}
- if (prompt)
- (void) write(output, prompt, strlen(prompt));
-
/*
* Catch signals that would otherwise cause the user to end
- * up with echo turned off in the shell. Don't worry about
- * things like SIGALRM and SIGPIPE for now.
+ * up with echo turned off in the shell.
*/
+ zero_bytes(&sa, sizeof(sa));
sigemptyset(&sa.sa_mask);
- sa.sa_flags = 0; /* don't restart system calls */
+ sa.sa_flags = SA_INTERRUPT; /* don't restart system calls */
sa.sa_handler = handler;
+ (void) sigaction(SIGALRM, &sa, &savealrm);
(void) sigaction(SIGINT, &sa, &saveint);
(void) sigaction(SIGHUP, &sa, &savehup);
(void) sigaction(SIGQUIT, &sa, &savequit);
(void) sigaction(SIGTTOU, &sa, &savettou);
/* Turn echo off/on as specified by flags. */
- if (term_getattr(input, &oterm) == 0) {
+ if (tcgetattr(input, &oterm) == 0) {
(void) memcpy(&term, &oterm, sizeof(term));
- if (!(flags & TGP_ECHO))
- term.tflags &= ~(ECHO | ECHONL);
+ if (!ISSET(flags, TGP_ECHO))
+ CLR(term.c_lflag, ECHO|ECHONL);
#ifdef VSTATUS
term.c_cc[VSTATUS] = _POSIX_VDISABLE;
#endif
- (void) term_setattr(input, &term);
+ (void) tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
} else {
- memset(&term, 0, sizeof(term));
- memset(&oterm, 0, sizeof(oterm));
+ zero_bytes(&term, sizeof(term));
+ zero_bytes(&oterm, sizeof(oterm));
}
- pass = tgetline(input, buf, sizeof(buf), timeout);
- save_errno = errno;
+ /* No output if we are already backgrounded. */
+ if (signo != SIGTTOU && signo != SIGTTIN) {
+ if (prompt)
+ (void) write(output, prompt, strlen(prompt));
- if (!(term.tflags & ECHO))
- (void) write(output, "\n", 1);
+ if (timeout > 0)
+ alarm(timeout);
+ pass = getln(input, buf, sizeof(buf));
+ alarm(0);
+ save_errno = errno;
+
+ if (!ISSET(term.c_lflag, ECHO))
+ (void) write(output, "\n", 1);
+ }
/* Restore old tty settings and signals. */
- if (memcmp(&term, &oterm, sizeof(term)) != 0)
- (void) term_setattr(input, &oterm);
+ if (memcmp(&term, &oterm, sizeof(term)) != 0) {
+ while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
+ errno == EINTR)
+ continue;
+ }
+ (void) sigaction(SIGALRM, &savealrm, NULL);
(void) sigaction(SIGINT, &saveint, NULL);
(void) sigaction(SIGHUP, &savehup, NULL);
(void) sigaction(SIGQUIT, &savequit, NULL);
* now that we have restored the signal handlers.
*/
if (signo) {
- kill(getpid(), signo);
+ kill(getpid(), signo);
switch (signo) {
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
- signo = 0;
goto restart;
}
}
- errno = save_errno;
+ if (save_errno)
+ errno = save_errno;
return(pass);
}
/*
- * Get a line of input (optionally timing out) and place it in buf.
+ * Fork a child and exec sudo-askpass to get the password from the user.
*/
static char *
-tgetline(fd, buf, bufsiz, timeout)
+sudo_askpass(prompt)
+ const char *prompt;
+{
+ static char buf[SUDO_PASS_MAX + 1], *pass;
+ sigaction_t sa, saved_sa_pipe;
+ int pfd[2];
+ pid_t pid;
+
+ if (pipe(pfd) == -1)
+ error(1, "unable to create pipe");
+
+ if ((pid = fork()) == -1)
+ error(1, "unable to fork");
+
+ if (pid == 0) {
+ /* child, point stdout to output side of the pipe and exec askpass */
+ (void) dup2(pfd[1], STDOUT_FILENO);
+ set_perms(PERM_FULL_USER);
+ closefrom(STDERR_FILENO + 1);
+ execl(user_askpass, user_askpass, prompt, (char *)NULL);
+ warning("unable to run %s", user_askpass);
+ _exit(255);
+ }
+
+ /* Ignore SIGPIPE in case child exits prematurely */
+ zero_bytes(&sa, sizeof(sa));
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+ sa.sa_handler = SIG_IGN;
+ (void) sigaction(SIGPIPE, &sa, &saved_sa_pipe);
+
+ /* Get response from child (askpass) and restore SIGPIPE handler */
+ (void) close(pfd[1]);
+ pass = getln(pfd[0], buf, sizeof(buf));
+ (void) close(pfd[0]);
+ (void) sigaction(SIGPIPE, &saved_sa_pipe, NULL);
+
+ return(pass);
+}
+
+static char *
+getln(fd, buf, bufsiz)
int fd;
char *buf;
size_t bufsiz;
- int timeout;
{
- fd_set *readfds = NULL;
- struct timeval tv;
- size_t left;
- char *cp;
- char c;
- int n;
+ ssize_t nr = -1;
+ char *cp = buf;
+ char c = '\0';
if (bufsiz == 0) {
errno = EINVAL;
return(NULL); /* sanity */
}
- cp = buf;
- left = bufsiz;
-
- /*
- * Timeout of <= 0 means no timeout.
- */
- if (timeout > 0) {
- /* Setup for select(2) */
- n = howmany(fd + 1, NFDBITS) * sizeof(fd_mask);
- readfds = (fd_set *) emalloc(n);
- (void) memset((VOID *)readfds, 0, n);
-
- /* Set timeout for select */
- tv.tv_sec = timeout;
- tv.tv_usec = 0;
-
- while (--left) {
- FD_SET(fd, readfds);
-
- /* Make sure there is something to read (or timeout) */
- while ((n = select(fd + 1, readfds, 0, 0, &tv)) == -1 &&
- errno == EAGAIN)
- ;
- if (n <= 0) {
- free(readfds);
- return(NULL); /* timeout or interrupt */
- }
-
- /* Read a character, exit loop on error, EOF or EOL */
- n = read(fd, &c, 1);
- if (n != 1 || c == '\n' || c == '\r')
- break;
- *cp++ = c;
- }
- free(readfds);
- } else {
- /* Keep reading until out of space, EOF, error, or newline */
- n = -1;
- while (--left && (n = read(fd, &c, 1)) == 1 && c != '\n' && c != '\r')
- *cp++ = c;
+ while (--bufsiz) {
+ nr = read(fd, &c, 1);
+ if (nr != 1 || c == '\n' || c == '\r')
+ break;
+ *cp++ = c;
}
*cp = '\0';
- return(n == -1 ? NULL : buf);
+ return(nr == 1 ? buf : NULL);
}
-static void handler(s)
+static void
+handler(s)
int s;
{
- signo = s;
+ if (s != SIGALRM)
+ signo = s;
+}
+
+int
+tty_present()
+{
+ int fd;
+
+ if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) != -1)
+ close(fd);
+ return(fd != -1);
}
projects / debian / sudo / blobdiff