Adding upstream version 1.8.27.upstream/1.8.27upstream

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

1 files changed, 316 insertions, 0 deletions

diff --git a/lib/util/ttyname_dev.c b/lib/util/ttyname_dev.c
new file mode 100644
index 0000000..3d8e20a
--- /dev/null
+++ b/lib/util/ttyname_dev.c
@@ -0,0 +1,316 @@
+/*
+ * Copyright (c) 2012-2018 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>
+#if defined(MAJOR_IN_MKDEV)
+# include <sys/mkdev.h>
+#elif defined(MAJOR_IN_SYSMACROS)
+# include <sys/sysmacros.h>
+#else
+# include <sys/param.h>
+#endif
+#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 <limits.h>
+#include <dirent.h>
+
+#include <pathnames.h>
+#include "sudo_compat.h"
+#include "sudo_debug.h"
+#include "sudo_conf.h"
+#include "sudo_util.h"
+
+#if defined(HAVE_DEVNAME)
+/*
+ * Like ttyname() but uses a dev_t instead of an open fd.
+ * Returns name on success and NULL on failure, setting errno.
+ * The BSD version uses devname().
+ */
+char *
+sudo_ttyname_dev_v1(dev_t tdev, char *name, size_t namelen)
+{
+    char *dev;
+    debug_decl(sudo_ttyname_dev, SUDO_DEBUG_UTIL)
+
+    /* Some versions of devname() return NULL on failure, others do not. */
+    dev = devname(tdev, S_IFCHR);
+    if (dev != NULL && *dev != '?' && *dev != '#') {
+	if (strlcpy(name, _PATH_DEV, namelen) < namelen &&
+	    strlcat(name, dev, namelen) < namelen)
+	    debug_return_str(name);
+	errno = ERANGE;
+    } else {
+	/* Not all versions of devname() set errno. */
+	errno = ENOENT;
+    }
+    debug_return_str(NULL);
+}
+#elif defined(HAVE__TTYNAME_DEV)
+extern char *_ttyname_dev(dev_t rdev, char *buffer, size_t buflen);
+
+/*
+ * Like ttyname() but uses a dev_t instead of an open fd.
+ * Returns name on success and NULL on failure, setting errno.
+ * This version is just a wrapper around _ttyname_dev().
+ */
+char *
+sudo_ttyname_dev_v1(dev_t tdev, char *name, size_t namelen)
+{
+    int serrno = errno;
+    debug_decl(sudo_ttyname_dev, SUDO_DEBUG_UTIL)
+
+    /*
+     * _ttyname_dev() sets errno to ERANGE if namelen is too small
+     * but does not modify it if tdev is not found.
+     */
+    errno = ENOENT;
+    if (_ttyname_dev(tdev, name, namelen) == NULL)
+	debug_return_str(NULL);
+    errno = serrno;
+
+    debug_return_str(name);
+}
+#else
+/*
+ * Device nodes to ignore.
+ */
+static const char *ignore_devs[] = {
+    _PATH_DEV "stdin",
+    _PATH_DEV "stdout",
+    _PATH_DEV "stderr",
+    NULL
+};
+
+/*
+ * Do a scan of a directory looking for the specified device.
+ * Does not descend into subdirectories.
+ * Returns name on success and NULL on failure, setting errno.
+ */
+static char *
+sudo_ttyname_scan(const char *dir, dev_t rdev, char *name, size_t namelen)
+{
+    size_t sdlen;
+    char pathbuf[PATH_MAX];
+    char *ret = NULL;
+    struct dirent *dp;
+    struct stat sb;
+    unsigned int i;
+    DIR *d = NULL;
+    debug_decl(sudo_ttyname_scan, SUDO_DEBUG_UTIL)
+
+    if (dir[0] == '\0') {
+	errno = ENOENT;
+	goto done;
+    }
+    if ((d = opendir(dir)) == NULL)
+	goto done;
+
+    if (fstat(dirfd(d), &sb) == -1) {
+	sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+	    "unable to fstat %s", dir);
+	goto done;
+    }
+    if ((sb.st_mode & S_IWOTH) != 0) {
+	sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+	    "ignoring world-writable directory %s", dir);
+	errno = ENOENT;
+	goto done;
+    }
+
+    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+	"scanning for dev %u in %s", (unsigned int)rdev, dir);
+
+    sdlen = strlen(dir);
+    while (sdlen > 0 && dir[sdlen - 1] == '/')
+	sdlen--;
+    if (sdlen + 1 >= sizeof(pathbuf)) {
+	errno = ERANGE;
+	goto done;
+    }
+    memcpy(pathbuf, dir, sdlen);
+    pathbuf[sdlen++] = '/';
+
+    while ((dp = readdir(d)) != NULL) {
+	struct stat sb;
+
+	/* Skip anything starting with "." */
+	if (dp->d_name[0] == '.')
+	    continue;
+
+	pathbuf[sdlen] = '\0';
+	if (strlcat(pathbuf, dp->d_name, sizeof(pathbuf)) >= sizeof(pathbuf)) {
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		"%s%s is too big to fit in pathbuf", pathbuf, dp->d_name);
+	    continue;
+	}
+
+	/* Ignore device nodes listed in ignore_devs[]. */
+	for (i = 0; ignore_devs[i] != NULL; i++) {
+	    if (strcmp(pathbuf, ignore_devs[i]) == 0)
+		break;
+	}
+	if (ignore_devs[i] != NULL) {
+	    sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
+		"ignoring %s", pathbuf);
+	    continue;
+	}
+
+# if defined(HAVE_STRUCT_DIRENT_D_TYPE)
+	/*
+	 * Avoid excessive stat() calls by checking dp->d_type.
+	 */
+	switch (dp->d_type) {
+	    case DT_CHR:
+	    case DT_LNK:
+	    case DT_UNKNOWN:
+		break;
+	    default:
+		/* Not a character device or link, skip it. */
+		sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
+		    "skipping non-device %s", pathbuf);
+		continue;
+	}
+# endif
+	if (stat(pathbuf, &sb) == -1) {
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+		"unable to stat %s", pathbuf);
+	    continue;
+	}
+	if (S_ISCHR(sb.st_mode) && sb.st_rdev == rdev) {
+	    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+		"resolved dev %u as %s", (unsigned int)rdev, pathbuf);
+	    if (strlcpy(name, pathbuf, namelen) < namelen) {
+		ret = name;
+	    } else {
+		sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		    "unable to store %s, have %zu, need %zu",
+		    pathbuf, namelen, strlen(pathbuf) + 1);
+		errno = ERANGE;
+	    }
+	    goto done;
+	}
+    }
+
+done:
+    if (d != NULL)
+	closedir(d);
+    debug_return_str(ret);
+}
+
+static char *
+sudo_dev_check(dev_t rdev, const char *devname, char *buf, size_t buflen)
+{
+    struct stat sb;
+    debug_decl(sudo_dev_check, SUDO_DEBUG_UTIL)
+
+    if (stat(devname, &sb) == 0) {
+	if (S_ISCHR(sb.st_mode) && sb.st_rdev == rdev) {
+	    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+		"comparing dev %u to %s: match!",
+		(unsigned int)rdev, devname);
+	    if (strlcpy(buf, devname, buflen) < buflen)
+		debug_return_str(buf);
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		"unable to store %s, have %zu, need %zu",
+		devname, buflen, strlen(devname) + 1);
+	    errno = ERANGE;
+	}
+    }
+    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+	"comparing dev %u to %s: no", (unsigned int)rdev, devname);
+    debug_return_str(NULL);
+}
+
+/*
+ * Like ttyname() but uses a dev_t instead of an open fd.
+ * Returns name on success and NULL on failure, setting errno.
+ * Generic version.
+ */
+char *
+sudo_ttyname_dev_v1(dev_t rdev, char *buf, size_t buflen)
+{
+    const char *devsearch, *devsearch_end;
+    char path[PATH_MAX], *ret;
+    const char *cp, *ep;
+    size_t len;
+    debug_decl(sudo_ttyname_dev, SUDO_DEBUG_UTIL)
+
+    /*
+     * First, check /dev/console.
+     */
+    ret = sudo_dev_check(rdev, _PATH_DEV "console", buf, buflen);
+    if (ret != NULL)
+	goto done;
+
+    /*
+     * Then check the device search path.
+     */
+    devsearch = sudo_conf_devsearch_path();
+    devsearch_end = devsearch + strlen(devsearch);
+    for (cp = sudo_strsplit(devsearch, devsearch_end, ":", &ep);
+	cp != NULL; cp = sudo_strsplit(NULL, devsearch_end, ":", &ep)) {
+
+	len = (size_t)(ep - cp);
+	if (len >= sizeof(path)) {
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		"devsearch entry %.*s too long", (int)len, cp);
+	    continue;
+	}
+	memcpy(path, cp, len);
+	path[len] = '\0';
+
+	if (strcmp(path, _PATH_DEV "pts") == 0) {
+	    /* Special case /dev/pts */
+	    len = (size_t)snprintf(path, sizeof(path), "%spts/%u",
+		_PATH_DEV, (unsigned int)minor(rdev));
+	    if (len >= sizeof(path)) {
+		sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		    "devsearch entry %spts/%u too long",
+		    _PATH_DEV, (unsigned int)minor(rdev));
+		continue;
+	    }
+	    ret = sudo_dev_check(rdev, path, buf, buflen);
+	    if (ret != NULL)
+		goto done;
+	} else {
+	    /* Scan path, looking for rdev. */
+	    ret = sudo_ttyname_scan(path, rdev, buf, buflen);
+	    if (ret != NULL || errno == ENOMEM)
+		goto done;
+	}
+    }
+
+done:
+    debug_return_str(ret);
+}
+#endif