initial population

1 files changed, 118 insertions, 0 deletions

diff --git a/usr.bin/at/perm.c b/usr.bin/at/perm.c
new file mode 100644
index 0000000..64e4fbb
--- /dev/null
+++ b/usr.bin/at/perm.c
@@ -0,0 +1,118 @@
+/*	$NetBSD: perm.c,v 1.4 2016/03/13 00:32:09 dholland Exp $	*/
+
+/*
+ * perm.c - check user permission for at(1)
+ * Copyright (C) 1994  Thomas Koenig
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. The name of the author(s) may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* System Headers */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <pwd.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/* Local headers */
+
+#include "at.h"
+#include "panic.h"
+#include "pathnames.h"
+#include "privs.h"
+#include "perm.h"
+
+/* File scope variables */
+
+#ifndef lint
+#if 0
+static char rcsid[] = "$OpenBSD: perm.c,v 1.1 1997/03/01 23:40:12 millert Exp $";
+#else
+__RCSID("$NetBSD: perm.c,v 1.4 2016/03/13 00:32:09 dholland Exp $");
+#endif
+#endif
+
+/* Local functions */
+
+static bool
+check_for_user(FILE *fp, const char *name)
+{
+	char *buffer;
+	size_t len;
+	bool found = false;
+
+	len = strlen(name);
+	if ((buffer = malloc(len + 2)) == NULL)
+		panic("Insufficient virtual memory");
+
+	while (fgets(buffer, (int)len + 2, fp) != NULL) {
+		if (strncmp(name, buffer, len) == 0 && buffer[len] == '\n') {
+			found = true;
+			break;
+		}
+	}
+	(void)fclose(fp);
+	free(buffer);
+	return found;
+}
+
+/* Global functions */
+
+bool
+check_permission(void)
+{
+	FILE *fp;
+	uid_t uid = geteuid();
+	struct passwd *pentry;
+
+	if (uid == 0)
+		return true;
+
+	if ((pentry = getpwuid(uid)) == NULL) {
+		perror("Cannot access user database");
+		exit(EXIT_FAILURE);
+	}
+
+	privs_enter();
+
+	fp = fopen(_PATH_AT_ALLOW, "r");
+
+	privs_exit();
+
+	if (fp != NULL) {
+		return check_for_user(fp, pentry->pw_name);
+	} else {
+		privs_enter();
+
+		fp = fopen(_PATH_AT_DENY, "r");
+
+		privs_exit();
+
+		if (fp != NULL)
+			return !check_for_user(fp, pentry->pw_name);
+	}
+	return false;
+}