1 files changed, 100 insertions, 0 deletions
diff --git a/lib/iolog/iolog_mkdtemp.c b/lib/iolog/iolog_mkdtemp.c
new file mode 100644
index 0000000..6ac9c8f
--- /dev/null
+++ b/lib/iolog/iolog_mkdtemp.c
@@ -0,0 +1,100 @@
+/*
+ * 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 <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include <compat/stdbool.h>
+#endif
+#include <time.h>
+#include <errno.h>
+
+#include <sudo_compat.h>
+#include <sudo_debug.h>
+#include <sudo_fatal.h>
+#include <sudo_gettext.h>
+#include <sudo_util.h>
+#include <sudo_iolog.h>
+
+/*
+ * Create temporary directory and any parent directories as needed.
+ */
+bool
+iolog_mkdtemp(char *path)
+{
+    const mode_t iolog_filemode = iolog_get_file_mode();
+    const mode_t iolog_dirmode = iolog_get_dir_mode();
+    const uid_t iolog_uid = iolog_get_uid();
+    const gid_t iolog_gid = iolog_get_gid();
+    bool ok = false, uid_changed = false;
+    char *dir = sudo_basename(path);
+    mode_t omask;
+    int dfd;
+    debug_decl(iolog_mkdtemp, SUDO_DEBUG_UTIL);
+
+    /* umask must not be more restrictive than the file modes. */
+    omask = umask(ACCESSPERMS & ~(iolog_filemode|iolog_dirmode));
+
+    dfd = sudo_open_parent_dir(path, iolog_uid, iolog_gid, iolog_dirmode, true);
+    if (dfd == -1 && errno == EACCES) {
+	/* Try again as the I/O log owner (for NFS). */
+	uid_changed = iolog_swapids(false);
+	if (uid_changed)
+	    dfd = sudo_open_parent_dir(path, (uid_t)-1, (gid_t)-1,
+		iolog_dirmode, false);
+    }
+    if (dfd != -1) {
+	/* Create final path component. */
+	sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
+	    "mkdtemp %s", path);
+	/* We cannot retry mkdtemp() so always open as iolog user */
+	if (!uid_changed)
+	    uid_changed = iolog_swapids(false);
+	if (mkdtempat(dfd, dir) == NULL) {
+	    sudo_warn(U_("unable to mkdir %s"), path);
+	    ok = false;
+	} else {
+	    if (fchmodat(dfd, dir, iolog_dirmode, 0) != 0) {
+		/* Not a fatal error, pre-existing mode is 0700. */
+		sudo_warn(U_("unable to change mode of %s to 0%o"),
+		    path, (unsigned int)iolog_dirmode);
+	    }
+	    ok = true;
+	}
+	close(dfd);
+    }
+
+    umask(omask);
+
+    if (uid_changed) {
+	if (!iolog_swapids(true))
+	    ok = false;
+    }
+    debug_return_bool(ok);
+}