/*
- * Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 1996, 1998-2005, 2007-2010
+ * Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
#include <sys/types.h>
#include <sys/param.h>
-#ifdef HAVE_SYS_BSDTYPES_H
-# include <sys/bsdtypes.h>
-#endif /* HAVE_SYS_BSDTYPES_H */
-#include <sys/time.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <memory.h>
# endif
# include <string.h>
-#else
-# ifdef HAVE_STRINGS_H
-# include <strings.h>
-# endif
#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
-#ifdef HAVE_TERMIOS_H
-# include <termios.h>
-#else
-# ifdef HAVE_TERMIO_H
-# include <termio.h>
-# else
-# include <sgtty.h>
-# include <sys/ioctl.h>
-# endif /* HAVE_TERMIO_H */
-#endif /* HAVE_TERMIOS_H */
#include "sudo.h"
-#ifndef lint
-__unused static const char rcsid[] = "$Sudo: tgetpass.c,v 1.111.2.7 2008/06/21 00:27:01 millert Exp $";
-#endif /* lint */
-
-#ifndef TCSASOFT
-# define TCSASOFT 0
-#endif
-#ifndef ECHONL
-# define ECHONL 0
-#endif
-
-#ifndef _POSIX_VDISABLE
-# ifdef VDISABLE
-# define _POSIX_VDISABLE VDISABLE
-# else
-# define _POSIX_VDISABLE 0
-# endif
-#endif
-
-/*
- * Compat macros for non-termios systems.
- */
-#ifndef HAVE_TERMIOS_H
-# ifdef HAVE_TERMIO_H
-# 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
-# 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 volatile sig_atomic_t signo[NSIG];
static void handler __P((int));
-static char *getln __P((int, char *, size_t));
+static char *getln __P((int, char *, size_t, int));
+static char *sudo_askpass __P((const char *));
/*
* Like getpass(3) but with timeout and echo flags.
int flags;
{
sigaction_t sa, savealrm, saveint, savehup, savequit, saveterm;
- sigaction_t savetstp, savettin, savettou;
- struct termios term, oterm;
+ sigaction_t savetstp, savettin, savettou, savepipe;
char *pass;
static char buf[SUDO_PASS_MAX + 1];
- int input, output, save_errno;
+ int i, input, output, save_errno, neednl = 0, need_restart;
(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;
+ for (i = 0; i < NSIG; i++)
+ signo[i] = 0;
pass = NULL;
save_errno = 0;
+ need_restart = 0;
/* Open /dev/tty for reading/writing if possible else use stdin/stderr. */
if (ISSET(flags, TGP_STDIN) ||
(input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
output = STDERR_FILENO;
}
+ /*
+ * If we are using a tty but are not the foreground pgrp this will
+ * generate SIGTTOU, so do it *before* installing the signal handlers.
+ */
+ if (!ISSET(flags, TGP_ECHO)) {
+ if (def_pwfeedback)
+ neednl = term_cbreak(input);
+ else
+ neednl = term_noecho(input);
+ }
+
/*
* Catch signals that would otherwise cause the user to end
* up with echo turned off in the shell.
*/
+ zero_bytes(&sa, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_INTERRUPT; /* don't restart system calls */
sa.sa_handler = handler;
(void) sigaction(SIGTTIN, &sa, &savettin);
(void) sigaction(SIGTTOU, &sa, &savettou);
- /* Turn echo off/on as specified by flags. */
- if (tcgetattr(input, &oterm) == 0) {
- (void) memcpy(&term, &oterm, sizeof(term));
- if (!ISSET(flags, TGP_ECHO))
- CLR(term.c_lflag, ECHO|ECHONL);
-#ifdef VSTATUS
- term.c_cc[VSTATUS] = _POSIX_VDISABLE;
-#endif
- (void) tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
- } else {
- memset(&term, 0, sizeof(term));
- memset(&oterm, 0, sizeof(oterm));
- }
+ /* Ignore SIGPIPE in case stdin is a pipe and TGP_STDIN is set */
+ sa.sa_handler = SIG_IGN;
+ (void) sigaction(SIGPIPE, &sa, &savepipe);
- /* No output if we are already backgrounded. */
- if (signo != SIGTTOU && signo != SIGTTIN) {
- if (prompt)
- (void) write(output, prompt, strlen(prompt));
+ if (prompt)
+ (void) write(output, prompt, strlen(prompt));
- if (timeout > 0)
- alarm(timeout);
- pass = getln(input, buf, sizeof(buf));
- alarm(0);
- save_errno = errno;
+ if (timeout > 0)
+ alarm(timeout);
+ pass = getln(input, buf, sizeof(buf), def_pwfeedback);
+ alarm(0);
+ save_errno = errno;
- if (!ISSET(term.c_lflag, ECHO))
- (void) write(output, "\n", 1);
- }
+ if (neednl || pass == NULL)
+ (void) write(output, "\n", 1);
/* Restore old tty settings and signals. */
- if (memcmp(&term, &oterm, sizeof(term)) != 0) {
- while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
- errno == EINTR)
- continue;
- }
+ if (!ISSET(flags, TGP_ECHO))
+ term_restore(input, 1);
(void) sigaction(SIGALRM, &savealrm, NULL);
(void) sigaction(SIGINT, &saveint, NULL);
(void) sigaction(SIGHUP, &savehup, NULL);
(void) sigaction(SIGTSTP, &savetstp, NULL);
(void) sigaction(SIGTTIN, &savettin, NULL);
(void) sigaction(SIGTTOU, &savettou, NULL);
+ (void) sigaction(SIGTTOU, &savepipe, NULL);
if (input != STDIN_FILENO)
(void) close(input);
* If we were interrupted by a signal, resend it to ourselves
* now that we have restored the signal handlers.
*/
- if (signo) {
- kill(getpid(), signo);
- switch (signo) {
- case SIGTSTP:
- case SIGTTIN:
- case SIGTTOU:
- goto restart;
+ for (i = 0; i < NSIG; i++) {
+ if (signo[i]) {
+ kill(getpid(), i);
+ switch (i) {
+ case SIGTSTP:
+ case SIGTTIN:
+ case SIGTTOU:
+ need_restart = 1;
+ break;
+ }
}
}
+ if (need_restart)
+ goto restart;
if (save_errno)
errno = save_errno;
return(pass);
}
+/*
+ * Fork a child and exec sudo-askpass to get the password from the user.
+ */
+static char *
+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 */
+ if (dup2(pfd[1], STDOUT_FILENO) == -1) {
+ warning("dup2");
+ _exit(255);
+ }
+ (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 = SA_INTERRUPT;
+ 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), 0);
+ (void) close(pfd[0]);
+ (void) sigaction(SIGPIPE, &saved_sa_pipe, NULL);
+
+ return(pass);
+}
+
+extern int term_erase, term_kill;
+
static char *
-getln(fd, buf, bufsiz)
+getln(fd, buf, bufsiz, feedback)
int fd;
char *buf;
size_t bufsiz;
+ int feedback;
{
- char c, *cp;
- ssize_t nr;
+ size_t left = bufsiz;
+ ssize_t nr = -1;
+ char *cp = buf;
+ char c = '\0';
- if (bufsiz == 0) {
+ if (left == 0) {
errno = EINVAL;
return(NULL); /* sanity */
}
- cp = buf;
- nr = -1;
- while (--bufsiz && (nr = read(fd, &c, 1)) == 1 && c != '\n' && c != '\r')
+ while (--left) {
+ nr = read(fd, &c, 1);
+ if (nr != 1 || c == '\n' || c == '\r')
+ break;
+ if (feedback) {
+ if (c == term_kill) {
+ while (cp > buf) {
+ (void) write(fd, "\b \b", 3);
+ --cp;
+ }
+ left = bufsiz;
+ continue;
+ } else if (c == term_erase) {
+ if (cp > buf) {
+ (void) write(fd, "\b \b", 3);
+ --cp;
+ left++;
+ }
+ continue;
+ }
+ (void) write(fd, "*", 1);
+ }
*cp++ = c;
+ }
*cp = '\0';
- return(nr == -1 ? NULL : buf);
+ if (feedback) {
+ /* erase stars */
+ while (cp > buf) {
+ (void) write(fd, "\b \b", 3);
+ --cp;
+ }
+ }
+
+ return(nr == 1 ? buf : NULL);
}
static void
int s;
{
if (s != SIGALRM)
- signo = s;
+ signo[s] = 1;
+}
+
+int
+tty_present()
+{
+ int fd;
+
+ if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) != -1)
+ close(fd);
+ return(fd != -1);
}
projects / debian / sudo / blobdiff