Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_cdsa_utilities / lib / acl_process.cpp

diff --git a/Security/libsecurity_cdsa_utilities/lib/acl_process.cpp b/Security/libsecurity_cdsa_utilities/lib/acl_process.cpp
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+++ b/Security/libsecurity_cdsa_utilities/lib/acl_process.cpp
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+/*
+ * Copyright (c) 2000-2004,2006,2011,2014 Apple 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@
+ */
+
+
+//
+// acl_process - Process-attribute ACL subject type.
+//
+#include <security_cdsa_utilities/acl_process.h>
+#include <security_utilities/endian.h>
+#include <algorithm>
+
+
+//
+// Validate a credential set against this subject.
+// No credential is required for this match.
+//
+bool ProcessAclSubject::validate(const AclValidationContext &context) const
+{
+    // reality check (internal structure was validated when created)
+    assert(select.uses(CSSM_ACL_MATCH_BITS));
+    
+    // access the environment
+    Environment *env = context.environment<Environment>();
+    if (env == NULL) {
+        static Environment localEnvironment;
+        env = &localEnvironment;
+    }
+    
+    // match uid
+    if (select.uses(CSSM_ACL_MATCH_UID)) {
+        uid_t uid = env->getuid();
+        if (!(uid == select.uid || (select.uses(CSSM_ACL_MATCH_HONOR_ROOT) && uid == 0)))
+            return false;
+    }
+    
+    // match gid
+    if (select.uses(CSSM_ACL_MATCH_GID) && select.gid != env->getgid())
+        return false;
+        
+    return true;
+}
+
+
+//
+// Make a copy of this subject in CSSM_LIST form
+//
+CssmList ProcessAclSubject::toList(Allocator &alloc) const
+{
+    // all associated data is public (no secrets)
+    //@@@ ownership of selector data is murky; revisit after leak-plugging pass
+    CssmData sData(memcpy(alloc.alloc<CSSM_ACL_PROCESS_SUBJECT_SELECTOR>(),
+        &select, sizeof(select)), sizeof(select));
+       return TypedList(alloc, CSSM_ACL_SUBJECT_TYPE_PROCESS,
+        new(alloc) ListElement(sData));
+}
+
+
+//
+// Create a ProcessAclSubject
+//
+ProcessAclSubject *ProcessAclSubject::Maker::make(const TypedList &list) const
+{
+    // crack input apart
+       ListElement *selectorData;
+       crack(list, 1, &selectorData, CSSM_LIST_ELEMENT_DATUM);
+    AclProcessSubjectSelector selector;
+    selectorData->extract(selector);
+    
+    // validate input
+    if (selector.version != CSSM_ACL_PROCESS_SELECTOR_CURRENT_VERSION)
+        CssmError::throwMe(CSSM_ERRCODE_INVALID_ACL_SUBJECT_VALUE);
+    if (!selector.uses(CSSM_ACL_MATCH_BITS))
+        CssmError::throwMe(CSSM_ERRCODE_INVALID_ACL_SUBJECT_VALUE);
+        
+    // okay
+       return new ProcessAclSubject(selector);
+}
+
+ProcessAclSubject *ProcessAclSubject::Maker::make(Version, Reader &pub, Reader &priv) const
+{
+    AclProcessSubjectSelector selector; pub(selector);
+       n2hi(selector.version);
+       n2hi(selector.mask);
+       n2hi(selector.uid);
+       n2hi(selector.gid);
+       return new ProcessAclSubject(selector);
+}
+
+
+//
+// Export the subject to a memory blob
+//
+void ProcessAclSubject::exportBlob(Writer::Counter &pub, Writer::Counter &priv)
+{
+    pub(select);
+}
+
+void ProcessAclSubject::exportBlob(Writer &pub, Writer &priv)
+{
+       AclProcessSubjectSelector temp;
+       temp.version = h2n (select.version);
+       temp.mask = h2n (select.mask);
+       temp.uid = h2n (select.uid);
+       temp.gid = h2n (select.gid);
+    pub(temp);
+}
+
+
+//
+// Implement the default methods of a ProcessEnvironment
+//
+uid_t ProcessAclSubject::Environment::getuid() const
+{
+    return ::getuid();
+}
+
+gid_t ProcessAclSubject::Environment::getgid() const
+{
+    return ::getgid();
+}
+
+
+#ifdef DEBUGDUMP
+
+void ProcessAclSubject::debugDump() const
+{
+       Debug::dump("Process ");
+       if (select.uses(CSSM_ACL_MATCH_UID)) {
+               Debug::dump("uid=%d", int(select.uid));
+               if (select.uses(CSSM_ACL_MATCH_HONOR_ROOT))
+                       Debug::dump("+root");
+       }
+       if (select.uses(CSSM_ACL_MATCH_GID))
+               Debug::dump("gid=%d", int(select.gid));
+}
+
+#endif //DEBUGDUMP