opendoas: Fallback for setresuid(2).

[opendoas.git] / libopenbsd / bsd-setres_id.c

diff --git a/libopenbsd/bsd-setres_id.c b/libopenbsd/bsd-setres_id.c
new file mode 100644 (file)
index 0000000..f36d3eb
--- /dev/null
+++ b/libopenbsd/bsd-setres_id.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2012 Darren Tucker (dtucker at zip com au).
+ *
+ * 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.
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <string.h>
+
+#if !defined(HAVE_SETRESGID) || defined(BROKEN_SETRESGID)
+int
+setresgid(gid_t rgid, gid_t egid, gid_t sgid)
+{
+       int ret = 0;
+
+       if (rgid != sgid) {
+               errno = ENOSYS;
+               return -1;
+       }
+#if defined(HAVE_SETREGID) && !defined(BROKEN_SETREGID)
+       if (setregid(rgid, egid) < 0) {
+               ret = -1;
+       }
+#else
+       if (setegid(egid) < 0) {
+               ret = -1;
+       }
+       if (setgid(rgid) < 0) {
+               ret = -1;
+       }
+#endif
+       return ret;
+}
+#endif
+
+#if !defined(HAVE_SETRESUID) || defined(BROKEN_SETRESUID)
+int
+setresuid(uid_t ruid, uid_t euid, uid_t suid)
+{
+       int ret = 0;
+
+       if (ruid != suid) {
+               errno = ENOSYS;
+               return -1;
+       }
+#if defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID)
+       if (setreuid(ruid, euid) < 0) {
+               ret = -1;
+       }
+#else
+
+# ifndef SETEUID_BREAKS_SETUID
+       if (seteuid(euid) < 0) {
+               ret = -1;
+       }
+# endif
+       if (setuid(ruid) < 0) {
+               ret = -1;
+       }
+#endif
+       return ret;
+}
+#endif