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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:37:38 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:37:38 +0000
commitae581a19fbe896a797450b9d9573fb66f2735227 (patch)
tree56c40be8518a29c9351364d13a9676aa83932dc0 /lib/iolog/iolog_swapids.c
parentInitial commit. (diff)
downloadsudo-ae581a19fbe896a797450b9d9573fb66f2735227.tar.xz
sudo-ae581a19fbe896a797450b9d9573fb66f2735227.zip
Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--lib/iolog/iolog_swapids.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/lib/iolog/iolog_swapids.c b/lib/iolog/iolog_swapids.c
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+++ b/lib/iolog/iolog_swapids.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2009-2021 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 <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif
+#include <time.h>
+#include <unistd.h>
+
+#include "sudo_compat.h"
+#include "sudo_debug.h"
+#include "sudo_fatal.h"
+#include "sudo_gettext.h"
+#include "sudo_iolog.h"
+
+/*
+ * Set effective user and group-IDs to iolog_uid and iolog_gid.
+ * If restore flag is set, swap them back.
+ */
+bool
+iolog_swapids(bool restore)
+{
+#ifdef HAVE_SETEUID
+ static uid_t user_euid = (uid_t)-1;
+ static gid_t user_egid = (gid_t)-1;
+ const uid_t iolog_uid = iolog_get_uid();
+ const gid_t iolog_gid = iolog_get_gid();
+ debug_decl(io_swapids, SUDO_DEBUG_UTIL);
+
+ if (user_euid == (uid_t)-1)
+ user_euid = geteuid();
+ if (user_egid == (gid_t)-1)
+ user_egid = getegid();
+
+ if (restore) {
+ if (seteuid(user_euid) == -1) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
+ "%s: unable to restore effective uid to %d", __func__,
+ (int)user_euid);
+ sudo_warn("seteuid() %d -> %d", (int)iolog_uid, (int)user_euid);
+ debug_return_bool(false);
+ }
+ if (setegid(user_egid) == -1) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
+ "%s: unable to restore effective gid to %d", __func__,
+ (int)user_egid);
+ sudo_warn("setegid() %d -> %d", (int)iolog_gid, (int)user_egid);
+ debug_return_bool(false);
+ }
+ } else {
+ /* Fail silently if the user has insufficient privileges. */
+ if (setegid(iolog_gid) == -1) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
+ "%s: unable to set effective gid to %d", __func__,
+ (int)iolog_gid);
+ debug_return_bool(false);
+ }
+ if (seteuid(iolog_uid) == -1) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
+ "%s: unable to set effective uid to %d", __func__,
+ (int)iolog_uid);
+ debug_return_bool(false);
+ }
+ }
+ debug_return_bool(true);
+#else
+ return false;
+#endif
+}