Adding upstream version 1.8.27.upstream/1.8.27upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 195 insertions, 0 deletions

diff --git a/src/get_pty.c b/src/get_pty.c
new file mode 100644
index 0000000..3e1a26a
--- /dev/null
+++ b/src/get_pty.c
@@ -0,0 +1,195 @@
+/*
+ * Copyright (c) 2009-2012, 2014-2016
+ *	Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * 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.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#ifdef HAVE_SYS_STROPTS_H
+#include <sys/stropts.h>
+#endif /* HAVE_SYS_STROPTS_H */
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <grp.h>
+#include <pwd.h>
+
+#if defined(HAVE_LIBUTIL_H)
+# include <libutil.h>
+#elif defined(HAVE_UTIL_H)
+# include <util.h>
+#endif
+#ifdef HAVE_PTY_H
+# include <pty.h>
+#endif
+
+#include "sudo.h"
+
+#if defined(HAVE_OPENPTY)
+bool
+get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
+{
+    struct group *gr;
+    gid_t ttygid = -1;
+    bool ret = false;
+    debug_decl(get_pty, SUDO_DEBUG_PTY)
+
+    if ((gr = getgrnam("tty")) != NULL)
+	ttygid = gr->gr_gid;
+
+    if (openpty(master, slave, name, NULL, NULL) == 0) {
+	if (chown(name, ttyuid, ttygid) == 0)
+	    ret = true;
+    }
+
+    debug_return_bool(ret);
+}
+
+#elif defined(HAVE__GETPTY)
+bool
+get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
+{
+    char *line;
+    bool ret = false;
+    debug_decl(get_pty, SUDO_DEBUG_PTY)
+
+    /* IRIX-style dynamic ptys (may fork) */
+    line = _getpty(master, O_RDWR, S_IRUSR|S_IWUSR|S_IWGRP, 0);
+    if (line != NULL) {
+	*slave = open(line, O_RDWR|O_NOCTTY, 0);
+	if (*slave != -1) {
+	    (void) chown(line, ttyuid, -1);
+	    strlcpy(name, line, namesz);
+	    ret = true;
+	} else {
+	    close(*master);
+	    *master = -1;
+	}
+    }
+    debug_return_bool(ret);
+}
+#elif defined(HAVE_GRANTPT)
+# ifndef HAVE_POSIX_OPENPT
+static int
+posix_openpt(int oflag)
+{
+    int fd;
+
+#  ifdef _AIX
+    fd = open(_PATH_DEV "ptc", oflag);
+#  else
+    fd = open(_PATH_DEV "ptmx", oflag);
+#  endif
+    return fd;
+}
+# endif /* HAVE_POSIX_OPENPT */
+
+bool
+get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
+{
+    char *line;
+    bool ret = false;
+    debug_decl(get_pty, SUDO_DEBUG_PTY)
+
+    *master = posix_openpt(O_RDWR|O_NOCTTY);
+    if (*master != -1) {
+	(void) grantpt(*master); /* may fork */
+	if (unlockpt(*master) != 0) {
+	    close(*master);
+	    goto done;
+	}
+	line = ptsname(*master);
+	if (line == NULL) {
+	    close(*master);
+	    goto done;
+	}
+	*slave = open(line, O_RDWR|O_NOCTTY, 0);
+	if (*slave == -1) {
+	    close(*master);
+	    goto done;
+	}
+# if defined(I_PUSH) && !defined(_AIX)
+	ioctl(*slave, I_PUSH, "ptem");	/* pseudo tty emulation module */
+	ioctl(*slave, I_PUSH, "ldterm");	/* line discipline module */
+# endif
+	(void) chown(line, ttyuid, -1);
+	strlcpy(name, line, namesz);
+	ret = true;
+    }
+done:
+    debug_return_bool(ret);
+}
+
+#else /* Old-style BSD ptys */
+
+static char line[] = _PATH_DEV "ptyXX";
+
+bool
+get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
+{
+    char *bank, *cp;
+    struct group *gr;
+    gid_t ttygid = -1;
+    bool ret = false;
+    debug_decl(get_pty, SUDO_DEBUG_PTY)
+
+    if ((gr = getgrnam("tty")) != NULL)
+	ttygid = gr->gr_gid;
+
+    for (bank = "pqrs"; *bank != '\0'; bank++) {
+	line[sizeof(_PATH_DEV "ptyX") - 2] = *bank;
+	for (cp = "0123456789abcdef"; *cp != '\0'; cp++) {
+	    line[sizeof(_PATH_DEV "ptyXX") - 2] = *cp;
+	    *master = open(line, O_RDWR|O_NOCTTY, 0);
+	    if (*master == -1) {
+		if (errno == ENOENT)
+		    goto done; /* out of ptys */
+		continue; /* already in use */
+	    }
+	    line[sizeof(_PATH_DEV "p") - 2] = 't';
+	    (void) chown(line, ttyuid, ttygid);
+	    (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
+# ifdef HAVE_REVOKE
+	    (void) revoke(line);
+# endif
+	    *slave = open(line, O_RDWR|O_NOCTTY, 0);
+	    if (*slave != -1) {
+		    strlcpy(name, line, namesz);
+		    ret = true; /* success */
+		    goto done;
+	    }
+	    (void) close(*master);
+	}
+    }
+done:
+    debug_return_bool(ret);
+}
+#endif /* HAVE_OPENPTY */