2 * security-core-clr.c: CoreCLR security
5 * Mark Probst <mark.probst@gmail.com>
6 * Sebastien Pouliot <sebastien@ximian.com>
8 * Copyright 2007-2010 Novell, Inc (http://www.novell.com)
11 #include <mono/metadata/class-internals.h>
12 #include <mono/metadata/security-manager.h>
13 #include <mono/metadata/assembly.h>
14 #include <mono/metadata/appdomain.h>
15 #include <mono/metadata/verify-internals.h>
16 #include <mono/metadata/object.h>
17 #include <mono/metadata/exception.h>
18 #include <mono/metadata/debug-helpers.h>
19 #include <mono/utils/mono-logger-internals.h>
21 #include "security-core-clr.h"
23 gboolean mono_security_core_clr_test = FALSE;
25 static MonoSecurityCoreCLROptions security_core_clr_options = MONO_SECURITY_CORE_CLR_OPTIONS_DEFAULT;
28 * mono_security_core_clr_set_options:
29 * @options: the new options for the coreclr system to use
31 * By default, the CoreCLRs security model forbids execution trough reflection of methods not visible from the calling code.
32 * Even if the method being called is not in a platform assembly. For non moonlight CoreCLR users this restriction does not
33 * make a lot of sense, since the author could have just changed the non platform assembly to allow the method to be called.
34 * This function allows specific relaxations from the default behaviour to be set.
36 * Use MONO_SECURITY_CORE_CLR_OPTIONS_DEFAULT for the default coreclr coreclr behaviour as used in Moonlight.
38 * Use MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_REFLECTION to allow transparent code to execute methods and access
39 * fields that are not in platformcode, even if those methods and fields are private or otherwise not visible to the calling code.
41 * Use MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_DELEGATE to allow delegates to be created that point at methods that are not in
42 * platformcode even if those methods and fields are private or otherwise not visible to the calling code.
46 mono_security_core_clr_set_options (MonoSecurityCoreCLROptions options) {
47 security_core_clr_options = options;
51 * mono_security_core_clr_get_options:
53 * Retrieves the current options used by the coreclr system.
56 MonoSecurityCoreCLROptions
57 mono_security_core_clr_get_options ()
59 return security_core_clr_options;
63 * default_platform_check:
65 * Default platform check. Always TRUE for current corlib (minimum
66 * trust-able subset) otherwise return FALSE. Any real CoreCLR host
67 * should provide its own callback to define platform code (i.e.
68 * this default is meant for test only).
71 default_platform_check (const char *image_name)
73 if (mono_defaults.corlib) {
74 return (strcmp (mono_defaults.corlib->name, image_name) == 0);
76 /* this can get called even before we load corlib (e.g. the EXE itself) */
77 const char *corlib = "mscorlib.dll";
78 int ilen = strlen (image_name);
79 int clen = strlen (corlib);
80 return ((ilen >= clen) && (strcmp ("mscorlib.dll", image_name + ilen - clen) == 0));
84 static MonoCoreClrPlatformCB platform_callback = default_platform_check;
87 * mono_security_core_clr_determine_platform_image:
89 * Call the supplied callback (from mono_security_set_core_clr_platform_callback)
90 * to determine if this image represents platform code.
93 mono_security_core_clr_determine_platform_image (MonoImage *image)
95 return platform_callback (image->name);
99 * mono_security_set_core_clr_platform_callback:
101 * Set the callback function that will be used to determine if an image
102 * is part, or not, of the platform code.
105 mono_security_set_core_clr_platform_callback (MonoCoreClrPlatformCB callback)
107 platform_callback = callback;
111 * mono_security_core_clr_is_platform_image:
113 * Return the (cached) boolean value indicating if this image represent platform code
116 mono_security_core_clr_is_platform_image (MonoImage *image)
118 return image->core_clr_platform_code;
121 /* Note: The above functions are outside this guard so that the public API isn't affected. */
123 #ifndef DISABLE_SECURITY
125 /* Class lazy loading functions */
126 static GENERATE_GET_CLASS_WITH_CACHE (security_critical, System.Security, SecurityCriticalAttribute)
127 static GENERATE_GET_CLASS_WITH_CACHE (security_safe_critical, System.Security, SecuritySafeCriticalAttribute)
130 security_critical_attribute (void)
132 return mono_class_get_security_critical_class ();
136 security_safe_critical_attribute (void)
138 return mono_class_get_security_safe_critical_class ();
142 /* sometime we get a NULL (not found) caller (e.g. get_reflection_caller) */
144 get_method_full_name (MonoMethod * method)
146 return method ? mono_method_full_name (method, TRUE) : g_strdup ("'no caller found'");
150 * set_type_load_exception_type
152 * Set MONO_EXCEPTION_TYPE_LOAD on the specified 'class' and provide
153 * a descriptive message for the exception. This message is also,
154 * optionally, being logged (export MONO_LOG_MASK="security") for
155 * debugging purposes.
158 set_type_load_exception_type (const char *format, MonoClass *klass)
160 char *type_name = mono_type_get_full_name (klass);
161 char *parent_name = mono_type_get_full_name (klass->parent);
162 char *message = g_strdup_printf (format, type_name, parent_name);
164 g_free (parent_name);
167 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_SECURITY, message);
168 mono_class_set_failure (klass, MONO_EXCEPTION_TYPE_LOAD, message);
169 // note: do not free string given to mono_class_set_failure
173 * set_type_load_exception_methods
175 * Set MONO_EXCEPTION_TYPE_LOAD on the 'override' class and provide
176 * a descriptive message for the exception. This message is also,
177 * optionally, being logged (export MONO_LOG_MASK="security") for
178 * debugging purposes.
181 set_type_load_exception_methods (const char *format, MonoMethod *override, MonoMethod *base)
183 char *method_name = get_method_full_name (override);
184 char *base_name = get_method_full_name (base);
185 char *message = g_strdup_printf (format, method_name, base_name);
188 g_free (method_name);
190 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_SECURITY, message);
191 mono_class_set_failure (override->klass, MONO_EXCEPTION_TYPE_LOAD, message);
192 // note: do not free string given to mono_class_set_failure
195 /* MonoClass is not fully initialized (inited is not yet == 1) when we
196 * check the inheritance rules so we need to look for the default ctor
197 * ourselve to avoid recursion (and aborting)
200 get_default_ctor (MonoClass *klass)
204 mono_class_setup_methods (klass);
208 for (i = 0; i < klass->method.count; ++i) {
209 MonoMethodSignature *sig;
210 MonoMethod *method = klass->methods [i];
215 if ((method->flags & METHOD_ATTRIBUTE_SPECIAL_NAME) == 0)
217 if ((method->name[0] != '.') || strcmp (".ctor", method->name))
219 sig = mono_method_signature (method);
220 if (sig && (sig->param_count == 0))
228 * mono_security_core_clr_check_inheritance:
230 * Determine if the specified class can inherit from its parent using
231 * the CoreCLR inheritance rules.
233 * Base Type Allow Derived Type
234 * ------------ ------------------
235 * Transparent Transparent, SafeCritical, Critical
236 * SafeCritical SafeCritical, Critical
239 * Reference: http://msdn.microsoft.com/en-us/magazine/cc765416.aspx#id0190030
241 * Furthermore a class MUST have a default constructor if its base
242 * class has a non-transparent, public or protected, default constructor.
243 * The same inheritance rule applies to both default constructors.
245 * Reference: message from a SecurityException in SL4RC
246 * Reference: fxcop CA2132 rule
249 mono_security_core_clr_check_inheritance (MonoClass *klass)
251 MonoSecurityCoreCLRLevel class_level, parent_level;
252 MonoClass *parent = klass->parent;
257 class_level = mono_security_core_clr_class_level (klass);
258 parent_level = mono_security_core_clr_class_level (parent);
260 if (class_level < parent_level) {
261 set_type_load_exception_type (
262 "Inheritance failure for type %s. Parent class %s is more restricted.",
265 MonoMethod *parent_ctor = get_default_ctor (parent);
266 if (parent_ctor && ((parent_ctor->flags & METHOD_ATTRIBUTE_PUBLIC) != 0)) {
267 class_level = mono_security_core_clr_method_level (get_default_ctor (klass), FALSE);
268 parent_level = mono_security_core_clr_method_level (parent_ctor, FALSE);
269 if (class_level < parent_level) {
270 set_type_load_exception_type (
271 "Inheritance failure for type %s. Default constructor security mismatch with %s.",
279 * mono_security_core_clr_check_override:
281 * Determine if the specified override can "legally" override the
282 * specified base method using the CoreCLR inheritance rules.
284 * Base (virtual/interface) Allowed override
285 * ------------------------ -------------------------
286 * Transparent Transparent, SafeCritical
287 * SafeCritical Transparent, SafeCritical
290 * Reference: http://msdn.microsoft.com/en-us/magazine/cc765416.aspx#id0190030
293 mono_security_core_clr_check_override (MonoClass *klass, MonoMethod *override, MonoMethod *base)
295 MonoSecurityCoreCLRLevel base_level = mono_security_core_clr_method_level (base, FALSE);
296 MonoSecurityCoreCLRLevel override_level = mono_security_core_clr_method_level (override, FALSE);
297 /* if the base method is decorated with [SecurityCritical] then the overrided method MUST be too */
298 if (base_level == MONO_SECURITY_CORE_CLR_CRITICAL) {
299 if (override_level != MONO_SECURITY_CORE_CLR_CRITICAL) {
300 set_type_load_exception_methods (
301 "Override failure for %s over %s. Override MUST be [SecurityCritical].",
305 /* base is [SecuritySafeCritical] or [SecurityTransparent], override MUST NOT be [SecurityCritical] */
306 if (override_level == MONO_SECURITY_CORE_CLR_CRITICAL) {
307 set_type_load_exception_methods (
308 "Override failure for %s over %s. Override must NOT be [SecurityCritical].",
315 * get_caller_no_reflection_related:
317 * Find the first managed caller that is either:
318 * (a) located outside the platform code assemblies; or
319 * (b) not related to reflection and delegates
321 * Returns TRUE to stop the stackwalk, FALSE to continue to the next frame.
324 get_caller_no_reflection_related (MonoMethod *m, gint32 no, gint32 ilo, gboolean managed, gpointer data)
326 MonoMethod **dest = (MonoMethod **)data;
329 /* skip unmanaged frames */
333 if (m->wrapper_type != MONO_WRAPPER_NONE)
336 /* quick out (any namespace not starting with an 'S' */
337 ns = m->klass->name_space;
338 if (!ns || (*ns != 'S')) {
343 /* stop if the method is not part of platform code */
344 if (!mono_security_core_clr_is_platform_image (m->klass->image)) {
349 /* any number of calls inside System.Reflection are allowed */
350 if (strcmp (ns, "System.Reflection") == 0)
353 /* any number of calls inside System.Reflection are allowed */
354 if (strcmp (ns, "System.Reflection.Emit") == 0)
357 /* calls from System.Delegate are also possible and allowed */
358 if (strcmp (ns, "System") == 0) {
359 const char *kname = m->klass->name;
360 if ((*kname == 'A') && (strcmp (kname, "Activator") == 0))
363 /* unlike most Invoke* cases InvokeMember is not inside System.Reflection[.Emit] but is SecuritySafeCritical */
364 if (((*kname == 'T') && (strcmp (kname, "Type") == 0)) ||
365 ((*kname == 'M') && (strcmp (kname, "MonoType")) == 0)) {
367 /* if calling InvokeMember then we can't stop the stackwalk here and need to look at the caller */
368 if (strcmp (m->name, "InvokeMember") == 0)
372 /* the security check on the delegate is made at creation time, not at invoke time */
373 if (((*kname == 'D') && (strcmp (kname, "Delegate") == 0)) ||
374 ((*kname == 'M') && (strcmp (kname, "MulticastDelegate")) == 0)) {
376 /* if we're invoking then we can stop our stack walk */
377 if (strcmp (m->name, "DynamicInvoke") != 0)
392 * get_reflection_caller:
394 * Walk to the first managed method outside:
395 * - System.Reflection* namespaces
396 * - System.[Multicast]Delegate or Activator type
398 * and return a pointer to its MonoMethod.
400 * This is required since CoreCLR checks needs to be done on this "real" caller.
403 get_reflection_caller (void)
405 MonoMethod *m = NULL;
406 mono_stack_walk_no_il (get_caller_no_reflection_related, &m);
407 if (G_UNLIKELY (!m)) {
408 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_SECURITY, "No caller outside reflection was found");
416 } ElevatedTrustCookie;
419 * get_caller_of_elevated_trust_code
421 * Stack walk to find who is calling code requiring Elevated Trust.
422 * If a critical method is found then the caller is platform code
423 * and has elevated trust, otherwise (transparent) a check needs to
424 * be done (on the managed side) to determine if the application is
425 * running with elevated permissions.
428 get_caller_of_elevated_trust_code (MonoMethod *m, gint32 no, gint32 ilo, gboolean managed, gpointer data)
430 ElevatedTrustCookie *cookie = (ElevatedTrustCookie *)data;
432 /* skip unmanaged frames and wrappers */
433 if (!managed || (m->wrapper_type != MONO_WRAPPER_NONE))
436 /* end stack walk if we find ourselves outside platform code (we won't find critical code anymore) */
437 if (!mono_security_core_clr_is_platform_image (m->klass->image)) {
442 switch (cookie->depth) {
443 /* while depth == 0 look for SecurityManager::[Check|Ensure]ElevatedPermissions */
445 if (strcmp (m->klass->name_space, "System.Security"))
447 if (strcmp (m->klass->name, "SecurityManager"))
449 if ((strcmp (m->name, "EnsureElevatedPermissions")) && strcmp (m->name, "CheckElevatedPermissions"))
453 /* while depth == 1 look for the caller to SecurityManager::[Check|Ensure]ElevatedPermissions */
455 /* this frame is [SecuritySafeCritical] because it calls [SecurityCritical] [Check|Ensure]ElevatedPermissions */
456 /* the next frame will contain the caller(s) we want to check */
459 /* while depth >= 2 look for [safe]critical caller, end stack walk if we find it */
462 /* if the caller is transparent then we continue the stack walk */
463 if (mono_security_core_clr_method_level (m, TRUE) == MONO_SECURITY_CORE_CLR_TRANSPARENT)
466 /* Security[Safe]Critical code is always allowed to call elevated-trust code */
475 * mono_security_core_clr_require_elevated_permissions:
477 * Return TRUE if the caller of the current method (the code who
478 * called SecurityManager.get_RequiresElevatedPermissions) needs
479 * elevated trust to perform an action.
481 * A stack walk is done to find the callers. If one of the callers
482 * is either [SecurityCritical] or [SecuritySafeCritical] then the
483 * action is needed for platform code (i.e. no restriction).
484 * Otherwise (transparent) the requested action needs elevated trust
487 mono_security_core_clr_require_elevated_permissions (void)
489 ElevatedTrustCookie cookie;
491 cookie.caller = NULL;
492 mono_stack_walk_no_il (get_caller_of_elevated_trust_code, &cookie);
494 /* return TRUE if the stack walk did not reach far enough or did not find callers */
495 if (!cookie.caller || cookie.depth < 3)
498 /* return TRUE if the caller is transparent, i.e. if elevated trust is required to continue executing the method */
499 return (mono_security_core_clr_method_level (cookie.caller, TRUE) == MONO_SECURITY_CORE_CLR_TRANSPARENT);
504 * check_field_access:
506 * Return TRUE if the caller method can access the specified field, FALSE otherwise.
509 check_field_access (MonoMethod *caller, MonoClassField *field)
511 /* if get_reflection_caller returns NULL then we assume the caller has NO privilege */
516 /* this check can occur before the field's type is resolved (and that can fail) */
517 mono_field_get_type_checked (field, &error);
518 if (!mono_error_ok (&error)) {
519 mono_error_cleanup (&error);
523 klass = (mono_field_get_flags (field) & FIELD_ATTRIBUTE_STATIC) ? NULL : mono_field_get_parent (field);
524 return mono_method_can_access_field_full (caller, field, klass);
530 * check_method_access:
532 * Return TRUE if the caller method can access the specified callee method, FALSE otherwise.
535 check_method_access (MonoMethod *caller, MonoMethod *callee)
537 /* if get_reflection_caller returns NULL then we assume the caller has NO privilege */
539 MonoClass *klass = (callee->flags & METHOD_ATTRIBUTE_STATIC) ? NULL : callee->klass;
540 return mono_method_can_access_method_full (caller, callee, klass);
546 * get_argument_exception
548 * Helper function to create an MonoException (ArgumentException in
549 * managed-land) and provide a descriptive message for it. This
550 * message is also, optionally, being logged (export
551 * MONO_LOG_MASK="security") for debugging purposes.
553 static MonoException*
554 get_argument_exception (const char *format, MonoMethod *caller, MonoMethod *callee)
557 char *caller_name = get_method_full_name (caller);
558 char *callee_name = get_method_full_name (callee);
559 char *message = g_strdup_printf (format, caller_name, callee_name);
560 g_free (callee_name);
561 g_free (caller_name);
563 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_SECURITY, message);
564 ex = mono_get_exception_argument ("method", message);
571 * get_field_access_exception
573 * Helper function to create an MonoException (FieldAccessException
574 * in managed-land) and provide a descriptive message for it. This
575 * message is also, optionally, being logged (export
576 * MONO_LOG_MASK="security") for debugging purposes.
578 static MonoException*
579 get_field_access_exception (const char *format, MonoMethod *caller, MonoClassField *field)
582 char *caller_name = get_method_full_name (caller);
583 char *field_name = mono_field_full_name (field);
584 char *message = g_strdup_printf (format, caller_name, field_name);
586 g_free (caller_name);
588 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_SECURITY, message);
589 ex = mono_get_exception_field_access_msg (message);
596 * get_method_access_exception
598 * Helper function to create an MonoException (MethodAccessException
599 * in managed-land) and provide a descriptive message for it. This
600 * message is also, optionally, being logged (export
601 * MONO_LOG_MASK="security") for debugging purposes.
603 static MonoException*
604 get_method_access_exception (const char *format, MonoMethod *caller, MonoMethod *callee)
607 char *caller_name = get_method_full_name (caller);
608 char *callee_name = get_method_full_name (callee);
609 char *message = g_strdup_printf (format, caller_name, callee_name);
610 g_free (callee_name);
611 g_free (caller_name);
613 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_SECURITY, message);
614 ex = mono_get_exception_method_access_msg (message);
621 * mono_security_core_clr_ensure_reflection_access_field:
623 * Ensure that the specified field can be used with reflection since
624 * Transparent code cannot access to Critical fields and can only use
625 * them if they are visible from it's point of view.
627 * A FieldAccessException is thrown if the field is cannot be accessed.
630 mono_security_core_clr_ensure_reflection_access_field (MonoClassField *field)
632 MonoMethod *caller = get_reflection_caller ();
633 /* CoreCLR restrictions applies to Transparent code/caller */
634 if (mono_security_core_clr_method_level (caller, TRUE) != MONO_SECURITY_CORE_CLR_TRANSPARENT)
637 if (mono_security_core_clr_get_options () & MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_REFLECTION) {
638 if (!mono_security_core_clr_is_platform_image (mono_field_get_parent(field)->image))
642 /* Transparent code cannot [get|set]value on Critical fields */
643 if (mono_security_core_clr_class_level (mono_field_get_parent (field)) == MONO_SECURITY_CORE_CLR_CRITICAL) {
644 mono_raise_exception (get_field_access_exception (
645 "Transparent method %s cannot get or set Critical field %s.",
649 /* also it cannot access a fields that is not visible from it's (caller) point of view */
650 if (!check_field_access (caller, field)) {
651 mono_raise_exception (get_field_access_exception (
652 "Transparent method %s cannot get or set private/internal field %s.",
658 * mono_security_core_clr_ensure_reflection_access_method:
660 * Ensure that the specified method can be used with reflection since
661 * Transparent code cannot call Critical methods and can only call them
662 * if they are visible from it's point of view.
664 * A MethodAccessException is thrown if the field is cannot be accessed.
667 mono_security_core_clr_ensure_reflection_access_method (MonoMethod *method)
669 MonoMethod *caller = get_reflection_caller ();
670 /* CoreCLR restrictions applies to Transparent code/caller */
671 if (mono_security_core_clr_method_level (caller, TRUE) != MONO_SECURITY_CORE_CLR_TRANSPARENT)
674 if (mono_security_core_clr_get_options () & MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_REFLECTION) {
675 if (!mono_security_core_clr_is_platform_image (method->klass->image))
679 /* Transparent code cannot invoke, even using reflection, Critical code */
680 if (mono_security_core_clr_method_level (method, TRUE) == MONO_SECURITY_CORE_CLR_CRITICAL) {
681 mono_raise_exception (get_method_access_exception (
682 "Transparent method %s cannot invoke Critical method %s.",
686 /* also it cannot invoke a method that is not visible from it's (caller) point of view */
687 if (!check_method_access (caller, method)) {
688 mono_raise_exception (get_method_access_exception (
689 "Transparent method %s cannot invoke private/internal method %s.",
695 * can_avoid_corlib_reflection_delegate_optimization:
697 * Mono's mscorlib use delegates to optimize PropertyInfo and EventInfo
698 * reflection calls. This requires either a bunch of additional, and not
699 * really required, [SecuritySafeCritical] in the class libraries or
700 * (like this) a way to skip them. As a bonus we also avoid the stack
701 * walk to find the caller.
703 * Return TRUE if we can skip this "internal" delegate creation, FALSE
707 can_avoid_corlib_reflection_delegate_optimization (MonoMethod *method)
709 if (!mono_security_core_clr_is_platform_image (method->klass->image))
712 if (strcmp (method->klass->name_space, "System.Reflection") != 0)
715 if (strcmp (method->klass->name, "MonoProperty") == 0) {
716 if ((strcmp (method->name, "GetterAdapterFrame") == 0) || strcmp (method->name, "StaticGetterAdapterFrame") == 0)
718 } else if (strcmp (method->klass->name, "EventInfo") == 0) {
719 if ((strcmp (method->name, "AddEventFrame") == 0) || strcmp (method->name, "StaticAddEventAdapterFrame") == 0)
727 * mono_security_core_clr_ensure_delegate_creation:
729 * Return TRUE if a delegate can be created on the specified method.
730 * CoreCLR also affect the binding, so throwOnBindFailure must be
731 * FALSE to let this function return (FALSE) normally, otherwise (if
732 * throwOnBindFailure is TRUE) it will throw an ArgumentException.
734 * A MethodAccessException is thrown if the specified method is not
735 * visible from the caller point of view.
738 mono_security_core_clr_ensure_delegate_creation (MonoMethod *method, gboolean throwOnBindFailure)
742 /* note: mscorlib creates delegates to avoid reflection (optimization), we ignore those cases */
743 if (can_avoid_corlib_reflection_delegate_optimization (method))
746 caller = get_reflection_caller ();
747 /* if the "real" caller is not Transparent then it do can anything */
748 if (mono_security_core_clr_method_level (caller, TRUE) != MONO_SECURITY_CORE_CLR_TRANSPARENT)
751 /* otherwise it (as a Transparent caller) cannot create a delegate on a Critical method... */
752 if (mono_security_core_clr_method_level (method, TRUE) == MONO_SECURITY_CORE_CLR_CRITICAL) {
753 /* but this throws only if 'throwOnBindFailure' is TRUE */
754 if (!throwOnBindFailure)
757 mono_raise_exception (get_argument_exception (
758 "Transparent method %s cannot create a delegate on Critical method %s.",
762 if (mono_security_core_clr_get_options () & MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_DELEGATE) {
763 if (!mono_security_core_clr_is_platform_image (method->klass->image))
767 /* also it cannot create the delegate on a method that is not visible from it's (caller) point of view */
768 if (!check_method_access (caller, method)) {
769 mono_raise_exception (get_method_access_exception (
770 "Transparent method %s cannot create a delegate on private/internal method %s.",
778 * mono_security_core_clr_ensure_dynamic_method_resolved_object:
780 * Called from mono_reflection_create_dynamic_method (reflection.c) to add some extra checks required for CoreCLR.
781 * Dynamic methods needs to check to see if the objects being used (e.g. methods, fields) comes from platform code
782 * and do an accessibility check in this case. Otherwise (i.e. user/application code) can be used without this extra
783 * accessbility check.
786 mono_security_core_clr_ensure_dynamic_method_resolved_object (gpointer ref, MonoClass *handle_class)
788 /* XXX find/create test cases for other handle_class XXX */
789 if (handle_class == mono_defaults.fieldhandle_class) {
790 MonoClassField *field = (MonoClassField*) ref;
791 MonoClass *klass = mono_field_get_parent (field);
792 /* fields coming from platform code have extra protection (accessibility check) */
793 if (mono_security_core_clr_is_platform_image (klass->image)) {
794 MonoMethod *caller = get_reflection_caller ();
795 /* XXX Critical code probably can do this / need some test cases (safer off otherwise) XXX */
796 if (!check_field_access (caller, field)) {
797 return get_field_access_exception (
798 "Dynamic method %s cannot create access private/internal field %s.",
802 } else if (handle_class == mono_defaults.methodhandle_class) {
803 MonoMethod *method = (MonoMethod*) ref;
804 /* methods coming from platform code have extra protection (accessibility check) */
805 if (mono_security_core_clr_is_platform_image (method->klass->image)) {
806 MonoMethod *caller = get_reflection_caller ();
807 /* XXX Critical code probably can do this / need some test cases (safer off otherwise) XXX */
808 if (!check_method_access (caller, method)) {
809 return get_method_access_exception (
810 "Dynamic method %s cannot create access private/internal method %s.",
819 * mono_security_core_clr_can_access_internals
821 * Check if we allow [InternalsVisibleTo] to work between two images.
824 mono_security_core_clr_can_access_internals (MonoImage *accessing, MonoImage* accessed)
826 /* are we trying to access internals of a platform assembly ? if not this is acceptable */
827 if (!mono_security_core_clr_is_platform_image (accessed))
830 /* we can't let everyone with the right name and public key token access the internals of platform code.
831 * (Silverlight can rely on the strongname signature of the assemblies, but Mono does not verify them)
832 * However platform code is fully trusted so it can access the internals of other platform code assemblies */
833 if (mono_security_core_clr_is_platform_image (accessing))
836 /* catch-22: System.Xml needs access to mscorlib's internals (e.g. ArrayList) but is not considered platform code.
837 * Promoting it to platform code would create another issue since (both Mono/Moonlight or MS version of)
838 * System.Xml.Linq.dll (an SDK, not platform, assembly) needs access to System.Xml.dll internals (either ).
839 * The solution is to trust, even transparent code, in the plugin directory to access platform code internals */
840 if (!accessed->assembly->basedir || !accessing->assembly->basedir)
842 return (strcmp (accessed->assembly->basedir, accessing->assembly->basedir) == 0);
846 * mono_security_core_clr_is_field_access_allowed
848 * Return a MonoException (FieldccessException in managed-land) if
849 * the access from "caller" to "field" is not valid under CoreCLR -
850 * i.e. a [SecurityTransparent] method calling a [SecurityCritical]
854 mono_security_core_clr_is_field_access_allowed (MonoMethod *caller, MonoClassField *field)
856 /* there's no restriction to access Transparent or SafeCritical fields, so we only check calls to Critical methods */
857 if (mono_security_core_clr_class_level (mono_field_get_parent (field)) != MONO_SECURITY_CORE_CLR_CRITICAL)
860 /* caller is Critical! only SafeCritical and Critical callers can access the field, so we throw if caller is Transparent */
861 if (!caller || (mono_security_core_clr_method_level (caller, TRUE) != MONO_SECURITY_CORE_CLR_TRANSPARENT))
864 return get_field_access_exception (
865 "Transparent method %s cannot call use Critical field %s.",
870 * mono_security_core_clr_is_call_allowed
872 * Return a MonoException (MethodAccessException in managed-land) if
873 * the call from "caller" to "callee" is not valid under CoreCLR -
874 * i.e. a [SecurityTransparent] method calling a [SecurityCritical]
878 mono_security_core_clr_is_call_allowed (MonoMethod *caller, MonoMethod *callee)
880 /* there's no restriction to call Transparent or SafeCritical code, so we only check calls to Critical methods */
881 if (mono_security_core_clr_method_level (callee, TRUE) != MONO_SECURITY_CORE_CLR_CRITICAL)
884 /* callee is Critical! only SafeCritical and Critical callers can call it, so we throw if the caller is Transparent */
885 if (!caller || (mono_security_core_clr_method_level (caller, TRUE) != MONO_SECURITY_CORE_CLR_TRANSPARENT))
888 return get_method_access_exception (
889 "Transparent method %s cannot call Critical method %s.",
894 * mono_security_core_clr_level_from_cinfo:
896 * Return the MonoSecurityCoreCLRLevel that match the attribute located
897 * in the specified custom attributes. If no attribute is present it
898 * defaults to MONO_SECURITY_CORE_CLR_TRANSPARENT, which is the default
899 * level for all code under the CoreCLR.
901 static MonoSecurityCoreCLRLevel
902 mono_security_core_clr_level_from_cinfo (MonoCustomAttrInfo *cinfo, MonoImage *image)
904 int level = MONO_SECURITY_CORE_CLR_TRANSPARENT;
906 if (cinfo && mono_custom_attrs_has_attr (cinfo, security_safe_critical_attribute ()))
907 level = MONO_SECURITY_CORE_CLR_SAFE_CRITICAL;
908 if (cinfo && mono_custom_attrs_has_attr (cinfo, security_critical_attribute ()))
909 level = MONO_SECURITY_CORE_CLR_CRITICAL;
911 return (MonoSecurityCoreCLRLevel)level;
915 * mono_security_core_clr_class_level_no_platform_check:
917 * Return the MonoSecurityCoreCLRLevel for the specified class, without
918 * checking for platform code. This help us avoid multiple redundant
920 * - a check for the method and one for the class;
921 * - a check for the class and outer class(es) ...
923 static MonoSecurityCoreCLRLevel
924 mono_security_core_clr_class_level_no_platform_check (MonoClass *klass)
926 MonoSecurityCoreCLRLevel level = MONO_SECURITY_CORE_CLR_TRANSPARENT;
927 MonoCustomAttrInfo *cinfo = mono_custom_attrs_from_class (klass);
929 level = mono_security_core_clr_level_from_cinfo (cinfo, klass->image);
930 mono_custom_attrs_free (cinfo);
933 if (level == MONO_SECURITY_CORE_CLR_TRANSPARENT && klass->nested_in)
934 level = mono_security_core_clr_class_level_no_platform_check (klass->nested_in);
940 * mono_security_core_clr_class_level:
942 * Return the MonoSecurityCoreCLRLevel for the specified class.
944 MonoSecurityCoreCLRLevel
945 mono_security_core_clr_class_level (MonoClass *klass)
947 /* non-platform code is always Transparent - whatever the attributes says */
948 if (!mono_security_core_clr_test && !mono_security_core_clr_is_platform_image (klass->image))
949 return MONO_SECURITY_CORE_CLR_TRANSPARENT;
951 return mono_security_core_clr_class_level_no_platform_check (klass);
955 * mono_security_core_clr_field_level:
957 * Return the MonoSecurityCoreCLRLevel for the specified field.
958 * If with_class_level is TRUE then the type (class) will also be
959 * checked, otherwise this will only report the information about
962 MonoSecurityCoreCLRLevel
963 mono_security_core_clr_field_level (MonoClassField *field, gboolean with_class_level)
965 MonoCustomAttrInfo *cinfo;
966 MonoSecurityCoreCLRLevel level = MONO_SECURITY_CORE_CLR_TRANSPARENT;
968 /* if get_reflection_caller returns NULL then we assume the caller has NO privilege */
972 /* non-platform code is always Transparent - whatever the attributes says */
973 if (!mono_security_core_clr_test && !mono_security_core_clr_is_platform_image (field->parent->image))
976 cinfo = mono_custom_attrs_from_field (field->parent, field);
978 level = mono_security_core_clr_level_from_cinfo (cinfo, field->parent->image);
979 mono_custom_attrs_free (cinfo);
982 if (with_class_level && level == MONO_SECURITY_CORE_CLR_TRANSPARENT)
983 level = mono_security_core_clr_class_level (field->parent);
989 * mono_security_core_clr_method_level:
991 * Return the MonoSecurityCoreCLRLevel for the specified method.
992 * If with_class_level is TRUE then the type (class) will also be
993 * checked, otherwise this will only report the information about
996 MonoSecurityCoreCLRLevel
997 mono_security_core_clr_method_level (MonoMethod *method, gboolean with_class_level)
999 MonoCustomAttrInfo *cinfo;
1000 MonoSecurityCoreCLRLevel level = MONO_SECURITY_CORE_CLR_TRANSPARENT;
1002 /* if get_reflection_caller returns NULL then we assume the caller has NO privilege */
1006 /* non-platform code is always Transparent - whatever the attributes says */
1007 if (!mono_security_core_clr_test && !mono_security_core_clr_is_platform_image (method->klass->image))
1010 cinfo = mono_custom_attrs_from_method (method);
1012 level = mono_security_core_clr_level_from_cinfo (cinfo, method->klass->image);
1013 mono_custom_attrs_free (cinfo);
1016 if (with_class_level && level == MONO_SECURITY_CORE_CLR_TRANSPARENT)
1017 level = mono_security_core_clr_class_level (method->klass);
1023 * mono_security_enable_core_clr:
1025 * Enable the verifier and the CoreCLR security model
1028 mono_security_enable_core_clr ()
1030 mono_verifier_set_mode (MONO_VERIFIER_MODE_VERIFIABLE);
1031 mono_security_set_mode (MONO_SECURITY_MODE_CORE_CLR);
1037 mono_security_core_clr_check_inheritance (MonoClass *klass)
1042 mono_security_core_clr_check_override (MonoClass *klass, MonoMethod *override, MonoMethod *base)
1047 mono_security_core_clr_require_elevated_permissions (void)
1053 mono_security_core_clr_ensure_reflection_access_field (MonoClassField *field)
1058 mono_security_core_clr_ensure_reflection_access_method (MonoMethod *method)
1063 mono_security_core_clr_ensure_delegate_creation (MonoMethod *method, gboolean throwOnBindFailure)
1069 mono_security_core_clr_ensure_dynamic_method_resolved_object (gpointer ref, MonoClass *handle_class)
1075 mono_security_core_clr_can_access_internals (MonoImage *accessing, MonoImage* accessed)
1081 mono_security_core_clr_is_field_access_allowed (MonoMethod *caller, MonoClassField *field)
1087 mono_security_core_clr_is_call_allowed (MonoMethod *caller, MonoMethod *callee)
1092 MonoSecurityCoreCLRLevel
1093 mono_security_core_clr_class_level (MonoClass *klass)
1095 return MONO_SECURITY_CORE_CLR_TRANSPARENT;
1098 MonoSecurityCoreCLRLevel
1099 mono_security_core_clr_field_level (MonoClassField *field, gboolean with_class_level)
1101 return MONO_SECURITY_CORE_CLR_TRANSPARENT;
1104 MonoSecurityCoreCLRLevel
1105 mono_security_core_clr_method_level (MonoMethod *method, gboolean with_class_level)
1107 return MONO_SECURITY_CORE_CLR_TRANSPARENT;
1111 mono_security_enable_core_clr ()
1115 #endif /* DISABLE_SECURITY */