Security/libsecurity_codesigning/lib/SecStaticCode.h

   1 /*
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  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, errSecSuccess. 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         @constant kSecCodeAttributeUniversalFileOffset The offset of a Mach-O specific slice of a universal Mach-O file.
  89 */
  90 extern const CFStringRef kSecCodeAttributeArchitecture;
  91 extern const CFStringRef kSecCodeAttributeSubarchitecture;
  92 extern const CFStringRef kSecCodeAttributeUniversalFileOffset;
  93 extern const CFStringRef kSecCodeAttributeBundleVersion;
  94
  95 OSStatus SecStaticCodeCreateWithPath(CFURLRef path, SecCSFlags flags, SecStaticCodeRef *staticCode);
  96
  97 OSStatus SecStaticCodeCreateWithPathAndAttributes(CFURLRef path, SecCSFlags flags, CFDictionaryRef attributes,
  98         SecStaticCodeRef *staticCode);
  99
 100
 101 /*!
 102         @function SecStaticCodeCheckValidity
 103         Performs static validation on the given SecStaticCode object. The call obtains and
 104         verifies the signature on the code object. It checks the validity of all
 105         sealed components (including resources, if any). It validates the code against
 106         a SecRequirement if one is given. The call succeeds if all these conditions
 107         are satisfactory. It fails otherwise.
 108
 109         This call is only secure if the code is not subject to concurrent modification,
 110         and the outcome is only valid as long as the code is unmodified thereafter.
 111         Consider this carefully if the underlying file system has dynamic characteristics,
 112         such as a network file system, union mount, FUSE, etc.
 113
 114         @param staticCode The code object to be validated.
 115         @param flags Optional flags. Pass kSecCSDefaultFlags for standard behavior.
 116
 117         @constant kSecCSCheckAllArchitectures
 118         For multi-architecture (universal) Mach-O programs, validate all architectures
 119         included. By default, only the native architecture is validated.
 120         @constant kSecCSNoDnotValidateExecutable
 121         Do not validate the contents of the main executable. This is normally done.
 122         @constant kSecCSNoNotValidateResources
 123         Do not validate the presence and contents of all bundle resources (if any).
 124         By default, a mismatch in any bundle resource causes validation to fail.
 125         @constant kSecCSCheckNestedCode
 126         For code in bundle form, locate and recursively check embedded code. Only code
 127         in standard locations is considered.
 128         @constant kSecCSStrictValidate
 129         For code in bundle form, perform additional checks to verify that the bundle
 130         is not structured in a way that would allow tampering, and reject any resource
 131         envelope that introduces weaknesses into the signature.
 132
 133         @param requirement On optional code requirement specifying additional conditions
 134         the staticCode object must satisfy to be considered valid. If NULL, no additional
 135         requirements are imposed.
 136         @param errors An optional pointer to a CFErrorRef variable. If the call fails
 137         (something other than errSecSuccess is returned), and this argument is non-NULL,
 138         a CFErrorRef is stored there further describing the nature and circumstances
 139         of the failure. The caller must CFRelease() this error object when done with it.
 140         @result If validation succeeds, errSecSuccess. If validation fails, an OSStatus value
 141         documented in CSCommon.h or certain other Security framework headers.
 142 */
 143 enum {
 144         kSecCSCheckAllArchitectures = 1 << 0,
 145         kSecCSDoNotValidateExecutable = 1 << 1,
 146         kSecCSDoNotValidateResources = 1 << 2,
 147         kSecCSBasicValidateOnly = kSecCSDoNotValidateExecutable | kSecCSDoNotValidateResources,
 148         kSecCSCheckNestedCode = 1 << 3,
 149         kSecCSStrictValidate = 1 << 4,
 150         kSecCSFullReport = 1 << 5,
 151 };
 152
 153 OSStatus SecStaticCodeCheckValidity(SecStaticCodeRef staticCode, SecCSFlags flags,
 154         SecRequirementRef requirement);
 155
 156 OSStatus SecStaticCodeCheckValidityWithErrors(SecStaticCodeRef staticCode, SecCSFlags flags,
 157         SecRequirementRef requirement, CFErrorRef *errors);
 158
 159
 160 #ifdef __cplusplus
 161 }
 162 #endif
 163
 164 #endif //_H_SECSTATICCODE