X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=liblttng-ust%2Fgetenv.h;fp=liblttng-ust%2Fgetenv.h;h=05864fb8eb39b5c79ef3cdae2e31118f9edf7165;hb=f40806c899f23f6006f38c55438ef8c5b7e69b9c;hp=0000000000000000000000000000000000000000;hpb=380691fa3812bc1637271217d6b69402cc8662d0;p=lttng-ust.git

diff --git a/liblttng-ust/getenv.h b/liblttng-ust/getenv.h
new file mode 100644
index 00000000..05864fb8
--- /dev/null
+++ b/liblttng-ust/getenv.h
@@ -0,0 +1,44 @@
+#ifndef _COMPAT_GETENV_H
+#define _COMPAT_GETENV_H
+
+/*
+ * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <usterr-signal-safe.h>
+
+static inline
+int lttng_is_setuid_setgid(void)
+{
+	return geteuid() != getuid() || getegid() != getgid();
+}
+
+static inline
+char *lttng_secure_getenv(const char *name)
+{
+	if (lttng_is_setuid_setgid()) {
+		ERR("Getting environment variable '%s' from setuid/setgid binary refused for security reasons.",
+			name);
+		return NULL;
+	}
+	return getenv(name);
+}
+
+#endif /* _COMPAT_GETENV_H */