Security-55163.44.tar.gz

[apple/security.git] / libsecurity_authorization / lib / trampolineServer.cpp

diff --git a/libsecurity_authorization/lib/trampolineServer.cpp b/libsecurity_authorization/lib/trampolineServer.cpp
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+/*
+ * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+//
+// trampolineServer.cpp - tool-side trampoline support functions
+//
+#include <cstdlib>
+#include <unistd.h>
+#include <Security/Authorization.h>
+
+
+//
+// In a tool launched via AuthorizationCopyPrivilegedReference, retrieve a copy
+// of the AuthorizationRef that started it all.
+//
+OSStatus AuthorizationCopyPrivilegedReference(AuthorizationRef *authorization,
+       AuthorizationFlags flags)
+{
+       // flags are currently reserved
+       if (flags != 0)
+               return errAuthorizationInvalidFlags;
+
+       // retrieve hex form of external form from environment
+       const char *mboxFdText = getenv("__AUTHORIZATION");
+       if (!mboxFdText)
+               return errAuthorizationInvalidRef;
+
+    // retrieve mailbox file and read external form
+    AuthorizationExternalForm extForm;
+    int fd;
+    if (sscanf(mboxFdText, "auth %d", &fd) != 1)
+        return errAuthorizationInvalidRef;
+    if (lseek(fd, 0, SEEK_SET) ||
+            read(fd, &extForm, sizeof(extForm)) != sizeof(extForm)) {
+        close(fd);
+        return errAuthorizationInvalidRef;
+    }
+
+       // internalize the authorization
+       AuthorizationRef auth;
+       if (OSStatus error = AuthorizationCreateFromExternalForm(&extForm, &auth))
+               return error;
+
+       // well, here you go
+       *authorization = auth;
+       return noErr;
+}