Move set_cap() to ncmlib/cap.[ch].

ncmlib/cap.c

@@ -0,0 +1,63 @@
+/* cap.c - POSIX capability support
+ * Time-stamp: <2010-11-12 09:01:07 njk>
+ *
+ * (c) 2004-2010 Nicholas J. Kain <njkain at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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, WHETHER 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.
+ */
+
+#include <unistd.h>
+#include <sys/capability.h>
+#include <sys/prctl.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <grp.h>
+
+#include "log.h"
+
+void set_cap(uid_t uid, gid_t gid, char *captxt)
+{
+    cap_t caps;
+
+    if (!captxt)
+        suicide("FATAL - set_cap: captxt == NULL");
+
+    if (prctl(PR_SET_KEEPCAPS, 1))
+        suicide("FATAL - set_cap: prctl() failed");
+
+    if (setgroups(0, NULL) == -1)
+        suicide("FATAL - set_cap: setgroups() failed");
+
+    if (setegid(gid) == -1 || seteuid(uid) == -1)
+        suicide("FATAL - set_cap: seteuid() failed");
+
+    caps = cap_from_text(captxt);
+    if (!caps)
+        suicide("FATAL - set_cap: cap_from_text() failed");
+
+    if (cap_set_proc(caps) == -1)
+        suicide("FATAL - set_cap: cap_set_proc() failed");
+
+    cap_free(caps);
+}

ncmlib/cap.h

@@ -0,0 +1,35 @@
+/* cap.h - POSIX capability support
+ * Time-stamp: <2010-11-12 08:59:46 njk>
+ *
+ * (c) 2005-2010 Nicholas J. Kain <njkain at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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, WHETHER 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.
+ */
+
+#ifndef NCM_CAP_H
+#define NCM_CAP_H
+
+void set_cap(uid_t uid, gid_t gid, char *captxt);
+
+#endif /* NCM_CAP_H */