1 files changed, 99 insertions, 0 deletions
diff --git a/lib/util/pw_dup.c b/lib/util/pw_dup.c
new file mode 100644
index 0000000..ccd2fbb
--- /dev/null
+++ b/lib/util/pw_dup.c
@@ -0,0 +1,99 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2000, 2002, 2012-2014
+ *	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.
+ *
+ * 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.
+ */
+
+/*
+ * 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>
+
+#ifndef HAVE_PW_DUP
+
+#include <stdlib.h>
+#include <string.h>
+#include <pwd.h>
+
+#include "sudo_compat.h"
+
+#define PW_SIZE(name, size)				\
+do {							\
+	if (pw->name) {					\
+		size = strlen(pw->name) + 1;		\
+		total += size;				\
+	}						\
+} while (0)
+
+#define PW_COPY(name, size)				\
+do {							\
+	if (pw->name) {					\
+		(void)memcpy(cp, pw->name, size);	\
+		newpw->name = cp;			\
+		cp += size;				\
+	}						\
+} while (0)
+
+struct passwd *
+sudo_pw_dup(const struct passwd *pw)
+{
+	size_t nsize = 0, psize = 0, gsize = 0, dsize = 0, ssize = 0, total;
+#ifdef HAVE_LOGIN_CAP_H
+	size_t csize = 0;
+#endif
+	struct passwd *newpw;
+	char *cp;
+
+	/* Allocate in one big chunk for easy freeing */
+	total = sizeof(struct passwd);
+	PW_SIZE(pw_name, nsize);
+	PW_SIZE(pw_passwd, psize);
+#ifdef HAVE_LOGIN_CAP_H
+	PW_SIZE(pw_class, csize);
+#endif
+	PW_SIZE(pw_gecos, gsize);
+	PW_SIZE(pw_dir, dsize);
+	PW_SIZE(pw_shell, ssize);
+
+	if ((cp = malloc(total)) == NULL)
+		return NULL;
+	newpw = (struct passwd *)cp;
+
+	/*
+	 * Copy in passwd contents and make strings relative to space
+	 * at the end of the buffer.
+	 */
+	(void)memcpy(newpw, pw, sizeof(struct passwd));
+	cp += sizeof(struct passwd);
+
+	PW_COPY(pw_name, nsize);
+	PW_COPY(pw_passwd, psize);
+#ifdef HAVE_LOGIN_CAP_H
+	PW_COPY(pw_class, csize);
+#endif
+	PW_COPY(pw_gecos, gsize);
+	PW_COPY(pw_dir, dsize);
+	PW_COPY(pw_shell, ssize);
+
+	return newpw;
+}
+#endif /* HAVE_PW_DUP */