+++ /dev/null
-/*
- * 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
- * copyright notice and this permission notice appear in all copies.
- *
- * 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.
- *
- * 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.
- */
-
-#ifdef __TANDEM
-# include <floss.h>
-#endif
-
-#include <config.h>
-
-#include <sys/types.h>
-#include <sys/param.h>
-#include <stdio.h>
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-# include <stddef.h>
-#else
-# ifdef HAVE_STDLIB_H
-# include <stdlib.h>
-# endif
-#endif /* STDC_HEADERS */
-#ifdef HAVE_STRING_H
-# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
-# include <memory.h>
-# endif
-# include <string.h>
-#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 <pwd.h>
-#include <errno.h>
-#include <signal.h>
-#include <fcntl.h>
-
-#include "sudo.h"
-
-static volatile sig_atomic_t signo[NSIG];
-
-static void handler __P((int));
-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.
- */
-char *
-tgetpass(prompt, timeout, flags)
- const char *prompt;
- int timeout;
- int flags;
-{
- sigaction_t sa, savealrm, saveint, savehup, savequit, saveterm;
- sigaction_t savetstp, savettin, savettou, savepipe;
- char *pass;
- static char buf[SUDO_PASS_MAX + 1];
- 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:
- 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) {
- input = STDIN_FILENO;
- 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(SIGALRM, &sa, &savealrm);
- (void) sigaction(SIGINT, &sa, &saveint);
- (void) sigaction(SIGHUP, &sa, &savehup);
- (void) sigaction(SIGQUIT, &sa, &savequit);
- (void) sigaction(SIGTERM, &sa, &saveterm);
- (void) sigaction(SIGTSTP, &sa, &savetstp);
- (void) sigaction(SIGTTIN, &sa, &savettin);
- (void) sigaction(SIGTTOU, &sa, &savettou);
-
- /* Ignore SIGPIPE in case stdin is a pipe and TGP_STDIN is set */
- sa.sa_handler = SIG_IGN;
- (void) sigaction(SIGPIPE, &sa, &savepipe);
-
- if (prompt)
- (void) write(output, prompt, strlen(prompt));
-
- if (timeout > 0)
- alarm(timeout);
- pass = getln(input, buf, sizeof(buf), def_pwfeedback);
- alarm(0);
- save_errno = errno;
-
- if (neednl || pass == NULL)
- (void) write(output, "\n", 1);
-
- /* Restore old tty settings and signals. */
- 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(SIGQUIT, &savequit, NULL);
- (void) sigaction(SIGTERM, &saveterm, 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.
- */
- 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, feedback)
- int fd;
- char *buf;
- size_t bufsiz;
- int feedback;
-{
- size_t left = bufsiz;
- ssize_t nr = -1;
- char *cp = buf;
- char c = '\0';
-
- if (left == 0) {
- errno = EINVAL;
- return(NULL); /* sanity */
- }
-
- 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';
- if (feedback) {
- /* erase stars */
- while (cp > buf) {
- (void) write(fd, "\b \b", 3);
- --cp;
- }
- }
-
- return(nr == 1 ? buf : NULL);
-}
-
-static void
-handler(s)
- int s;
-{
- if (s != SIGALRM)
- 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