libsecurity_codesigning/lib/SecStaticCode.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*!
  25         @header SecStaticCode
  26         SecStaticCode represents the Code Signing identity of code in the file system.
  27         This includes applications, tools, frameworks, plugins, scripts, and so on.
  28         Note that arbitrary files will be considered scripts of unknown provenance;
  29         and thus it is possible to handle most files as if they were code, though that is
  30         not necessarily a good idea.
  31
  32         Normally, each SecCode has a specific SecStaticCode that holds its static signing
  33         data. Informally, that is the SecStaticCode the SecCode "was made from" (by its host).
  34         There is however no viable link in the other direction - given a SecStaticCode,
  35         it is not possible to find, enumerate, or control any SecCode that originated from it.
  36         There might not be any at a given point in time; or there might be many.
  37 */
  38 #ifndef _H_SECSTATICCODE
  39 #define _H_SECSTATICCODE
  40
  41 #include <Security/CSCommon.h>
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47
  48 /*!
  49         @function SecStaticCodeGetTypeID
  50         Returns the type identifier of all SecStaticCode instances.
  51 */
  52 CFTypeID SecStaticCodeGetTypeID(void);
  53
  54
  55 /*!
  56         @function SecStaticCodeCreateWithPath
  57         Given a path to a file system object, create a SecStaticCode object representing
  58         the code at that location, if possible. Such a SecStaticCode is not inherently
  59         linked to running code in the system.
  60
  61         It is possible to create a SecStaticCode object from an unsigned code object.
  62         Most uses of such an object will return the errSecCSUnsigned error. However,
  63         SecCodeCopyPath and SecCodeCopySigningInformation can be safely applied to such objects.
  64
  65         @param path A path to a location in the file system. Only file:// URLs are
  66         currently supported. For bundles, pass a URL to the root directory of the
  67         bundle. For single files, pass a URL to the file. If you pass a URL to the
  68         main executable of a bundle, the bundle as a whole will be generally recognized.
  69         Caution: Paths containing embedded // or /../ within a bundle's directory
  70         may cause the bundle to be misconstrued. If you expect to submit such paths,
  71         first clean them with realpath(3) or equivalent.
  72         @param flags Optional flags. Pass kSecCSDefaultFlags for standard behavior.
  73         @param attributes A CFDictionary containing additional attributes of the code sought.
  74         @param staticCode On successful return, contains a reference to the StaticCode object
  75         representing the code at path. Unchanged on error.
  76         @result Upon success, noErr. Upon error, an OSStatus value documented in
  77         CSCommon.h or certain other Security framework headers.
  78
  79         @constant kSecCodeAttributeArchitecture Specifies the Mach-O architecture of code desired.
  80         This can be a CFString containing a canonical architecture name ("i386" etc.), or a CFNumber
  81         specifying an architecture numerically (see mach/machine.h). This key is ignored if the code
  82         is not in Mach-O binary form. If the code is Mach-O but not universal ("thin"), the architecture
  83         specified must agree with the actual file contents.
  84         @constant kSecCodeAttributeSubarchitecture If the architecture is specified numerically
  85         (using the kSecCodeAttributeArchitecture key), specifies any sub-architecture by number.
  86         This key is ignored if no main architecture is specified; if it is specified by name; or
  87         if the code is not in Mach-O form.
  88 */
  89 extern const CFStringRef kSecCodeAttributeArchitecture;
  90 extern const CFStringRef kSecCodeAttributeSubarchitecture;
  91 extern const CFStringRef kSecCodeAttributeBundleVersion;
  92
  93 OSStatus SecStaticCodeCreateWithPath(CFURLRef path, SecCSFlags flags, SecStaticCodeRef *staticCode);
  94
  95 OSStatus SecStaticCodeCreateWithPathAndAttributes(CFURLRef path, SecCSFlags flags, CFDictionaryRef attributes,
  96         SecStaticCodeRef *staticCode);
  97
  98
  99 /*!
 100         @function SecStaticCodeCheckValidity
 101         Performs static validation on the given SecStaticCode object. The call obtains and
 102         verifies the signature on the code object. It checks the validity of all
 103         sealed components (including resources, if any). It validates the code against
 104         a SecRequirement if one is given. The call succeeds if all these conditions
 105         are satisfactory. It fails otherwise.
 106
 107         This call is only secure if the code is not subject to concurrent modification,
 108         and the outcome is only valid as long as the code is unmodified thereafter.
 109         Consider this carefully if the underlying file system has dynamic characteristics,
 110         such as a network file system, union mount, FUSE, etc.
 111
 112         @param staticCode The code object to be validated.
 113         @param flags Optional flags. Pass kSecCSDefaultFlags for standard behavior.
 114
 115         @constant kSecCSCheckAllArchitectures
 116         For multi-architecture (universal) Mach-O programs, validate all architectures
 117         included. By default, only the native architecture is validated.
 118         @constant kSecCSNoDnotValidateExecutable
 119         Do not validate the contents of the main executable. This is normally done.
 120         @constant kSecCSNoNotValidateResources
 121         Do not validate the presence and contents of all bundle resources (if any).
 122         By default, a mismatch in any bundle resource causes validation to fail.
 123         @constant kSecCSCheckNestedCode
 124         For code in bundle form, locate and recursively check embedded code. Only code
 125         in standard locations is considered.
 126
 127         @param requirement On optional code requirement specifying additional conditions
 128         the staticCode object must satisfy to be considered valid. If NULL, no additional
 129         requirements are imposed.
 130         @param errors An optional pointer to a CFErrorRef variable. If the call fails
 131         (something other than noErr is returned), and this argument is non-NULL,
 132         a CFErrorRef is stored there further describing the nature and circumstances
 133         of the failure. The caller must CFRelease() this error object when done with it.
 134         @result If validation succeeds, noErr. If validation fails, an OSStatus value
 135         documented in CSCommon.h or certain other Security framework headers.
 136 */
 137 enum {
 138         kSecCSCheckAllArchitectures = 1 << 0,
 139         kSecCSDoNotValidateExecutable = 1 << 1,
 140         kSecCSDoNotValidateResources = 1 << 2,
 141         kSecCSBasicValidateOnly = kSecCSDoNotValidateExecutable | kSecCSDoNotValidateResources,
 142         kSecCSCheckNestedCode = 1 << 3,
 143 };
 144
 145 OSStatus SecStaticCodeCheckValidity(SecStaticCodeRef staticCode, SecCSFlags flags,
 146         SecRequirementRef requirement);
 147
 148 OSStatus SecStaticCodeCheckValidityWithErrors(SecStaticCodeRef staticCode, SecCSFlags flags,
 149         SecRequirementRef requirement, CFErrorRef *errors);
 150
 151
 152 #ifdef __cplusplus
 153 }
 154 #endif
 155
 156 #endif //_H_SECSTATICCODE