1 files changed, 129 insertions, 0 deletions
diff --git a/plugins/group_file/group_file.c b/plugins/group_file/group_file.c
new file mode 100644
index 0000000..de9a491
--- /dev/null
+++ b/plugins/group_file/group_file.c
@@ -0,0 +1,129 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2010-2014 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.
+ */
+
+/*
+ * 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/stat.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include <compat/stdbool.h>
+#endif /* HAVE_STDBOOL_H */
+#include <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 <sudo_plugin.h>
+#include <sudo_compat.h>
+
+/*
+ * Sample sudoers group plugin that uses an extra group file with the
+ * same format as /etc/group.
+ */
+
+static sudo_printf_t sudo_log;
+
+extern void mysetgrfile(const char *);
+extern int mysetgroupent(int);
+extern void myendgrent(void);
+extern struct group *mygetgrnam(const char *);
+
+static int
+sample_init(int version, sudo_printf_t sudo_printf, char *const argv[])
+{
+    struct stat sb;
+
+    sudo_log = sudo_printf;
+
+    if (SUDO_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
+	sudo_log(SUDO_CONV_ERROR_MSG,
+	    "group_file: incompatible major version %d, expected %d\n",
+	    SUDO_API_VERSION_GET_MAJOR(version),
+	    GROUP_API_VERSION_MAJOR);
+	return -1;
+    }
+
+    /* Check that the group file exists and has a safe mode. */
+    if (argv == NULL || argv[0] == NULL) {
+	sudo_log(SUDO_CONV_ERROR_MSG,
+	    "group_file: path to group file not specified\n");
+	return -1;
+    }
+    if (stat(argv[0], &sb) != 0) {
+	sudo_log(SUDO_CONV_ERROR_MSG,
+	    "group_file: %s: %s\n", argv[0], strerror(errno));
+	return -1;
+    }
+    if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
+	sudo_log(SUDO_CONV_ERROR_MSG,
+	    "%s must be only be writable by owner\n", argv[0]);
+	return -1;
+    }
+
+    mysetgrfile(argv[0]);
+    if (!mysetgroupent(1))
+	return false;
+
+    return true;
+}
+
+static void
+sample_cleanup(void)
+{
+    myendgrent();
+}
+
+/*
+ * Returns true if "user" is a member of "group", else false.
+ */
+static int
+sample_query(const char *user, const char *group, const struct passwd *pwd)
+{
+    struct group *grp;
+    char **member;
+
+    grp = mygetgrnam(group);
+    if (grp != NULL && grp->gr_mem != NULL) {
+	for (member = grp->gr_mem; *member != NULL; member++) {
+	    if (strcasecmp(user, *member) == 0)
+		return true;
+	}
+    }
+
+    return false;
+}
+
+sudo_dso_public struct sudoers_group_plugin group_plugin = {
+    GROUP_API_VERSION,
+    sample_init,
+    sample_cleanup,
+    sample_query
+};