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)
9 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
12 #include <mono/metadata/class-internals.h>
13 #include <mono/metadata/security-manager.h>
14 #include <mono/metadata/assembly.h>
15 #include <mono/metadata/appdomain.h>
16 #include <mono/metadata/verify-internals.h>
17 #include <mono/metadata/object.h>
18 #include <mono/metadata/exception.h>
19 #include <mono/metadata/debug-helpers.h>
20 #include <mono/utils/mono-logger-internals.h>
22 #include "security-core-clr.h"
24 gboolean mono_security_core_clr_test
= FALSE
;
26 static MonoSecurityCoreCLROptions security_core_clr_options
= MONO_SECURITY_CORE_CLR_OPTIONS_DEFAULT
;
29 * mono_security_core_clr_set_options:
30 * @options: the new options for the coreclr system to use
32 * By default, the CoreCLRs security model forbids execution trough reflection of methods not visible from the calling code.
33 * Even if the method being called is not in a platform assembly. For non moonlight CoreCLR users this restriction does not
34 * make a lot of sense, since the author could have just changed the non platform assembly to allow the method to be called.
35 * This function allows specific relaxations from the default behaviour to be set.
37 * Use MONO_SECURITY_CORE_CLR_OPTIONS_DEFAULT for the default coreclr coreclr behaviour as used in Moonlight.
39 * Use MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_REFLECTION to allow transparent code to execute methods and access
40 * fields that are not in platformcode, even if those methods and fields are private or otherwise not visible to the calling code.
42 * Use MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_DELEGATE to allow delegates to be created that point at methods that are not in
43 * platformcode even if those methods and fields are private or otherwise not visible to the calling code.
47 mono_security_core_clr_set_options (MonoSecurityCoreCLROptions options
) {
48 security_core_clr_options
= options
;
52 * mono_security_core_clr_get_options:
54 * Retrieves the current options used by the coreclr system.
57 MonoSecurityCoreCLROptions
58 mono_security_core_clr_get_options ()
60 return security_core_clr_options
;
64 * default_platform_check:
66 * Default platform check. Always TRUE for current corlib (minimum
67 * trust-able subset) otherwise return FALSE. Any real CoreCLR host
68 * should provide its own callback to define platform code (i.e.
69 * this default is meant for test only).
72 default_platform_check (const char *image_name
)
74 if (mono_defaults
.corlib
) {
75 return (strcmp (mono_defaults
.corlib
->name
, image_name
) == 0);
77 /* this can get called even before we load corlib (e.g. the EXE itself) */
78 const char *corlib
= "mscorlib.dll";
79 int ilen
= strlen (image_name
);
80 int clen
= strlen (corlib
);
81 return ((ilen
>= clen
) && (strcmp ("mscorlib.dll", image_name
+ ilen
- clen
) == 0));
85 static MonoCoreClrPlatformCB platform_callback
= default_platform_check
;
88 * mono_security_core_clr_determine_platform_image:
90 * Call the supplied callback (from mono_security_set_core_clr_platform_callback)
91 * to determine if this image represents platform code.
94 mono_security_core_clr_determine_platform_image (MonoImage
*image
)
96 return platform_callback (image
->name
);
100 * mono_security_set_core_clr_platform_callback:
102 * Set the callback function that will be used to determine if an image
103 * is part, or not, of the platform code.
106 mono_security_set_core_clr_platform_callback (MonoCoreClrPlatformCB callback
)
108 platform_callback
= callback
;
112 * mono_security_core_clr_is_platform_image:
114 * Return the (cached) boolean value indicating if this image represent platform code
117 mono_security_core_clr_is_platform_image (MonoImage
*image
)
119 return image
->core_clr_platform_code
;
122 /* Note: The above functions are outside this guard so that the public API isn't affected. */
124 #ifndef DISABLE_SECURITY
126 /* Class lazy loading functions */
127 static GENERATE_GET_CLASS_WITH_CACHE (security_critical
, "System.Security", "SecurityCriticalAttribute")
128 static GENERATE_GET_CLASS_WITH_CACHE (security_safe_critical
, "System.Security", "SecuritySafeCriticalAttribute")
131 security_critical_attribute (void)
133 return mono_class_get_security_critical_class ();
137 security_safe_critical_attribute (void)
139 return mono_class_get_security_safe_critical_class ();
143 /* sometime we get a NULL (not found) caller (e.g. get_reflection_caller) */
145 get_method_full_name (MonoMethod
* method
)
147 return method
? mono_method_full_name (method
, TRUE
) : g_strdup ("'no caller found'");
151 * set_type_load_exception_type
153 * Set MONO_EXCEPTION_TYPE_LOAD on the specified 'class' and provide
154 * a descriptive message for the exception. This message is also,
155 * optionally, being logged (export MONO_LOG_MASK="security") for
156 * debugging purposes.
159 set_type_load_exception_type (const char *format
, MonoClass
*klass
)
161 char *type_name
= mono_type_get_full_name (klass
);
162 char *parent_name
= mono_type_get_full_name (klass
->parent
);
163 char *message
= mono_image_strdup_printf (klass
->image
, format
, type_name
, parent_name
);
165 g_free (parent_name
);
168 mono_trace (G_LOG_LEVEL_WARNING
, MONO_TRACE_SECURITY
, "%s", message
);
169 mono_class_set_type_load_failure (klass
, "%s", message
);
170 // note: do not free string given to mono_class_set_failure
174 * set_type_load_exception_methods
176 * Set MONO_EXCEPTION_TYPE_LOAD on the 'override' class and provide
177 * a descriptive message for the exception. This message is also,
178 * optionally, being logged (export MONO_LOG_MASK="security") for
179 * debugging purposes.
182 set_type_load_exception_methods (const char *format
, MonoMethod
*override
, MonoMethod
*base
)
184 char *method_name
= get_method_full_name (override
);
185 char *base_name
= get_method_full_name (base
);
186 char *message
= mono_image_strdup_printf (override
->klass
->image
, format
, method_name
, base_name
);
189 g_free (method_name
);
191 mono_trace (G_LOG_LEVEL_WARNING
, MONO_TRACE_SECURITY
, "%s", message
);
192 mono_class_set_type_load_failure (override
->klass
, "%s", message
);
193 // note: do not free string given to mono_class_set_failure
196 /* MonoClass is not fully initialized (inited is not yet == 1) when we
197 * check the inheritance rules so we need to look for the default ctor
198 * ourselve to avoid recursion (and aborting)
201 get_default_ctor (MonoClass
*klass
)
205 mono_class_setup_methods (klass
);
209 int mcount
= mono_class_get_method_count (klass
);
210 for (i
= 0; i
< mcount
; ++i
) {
211 MonoMethodSignature
*sig
;
212 MonoMethod
*method
= klass
->methods
[i
];
217 if ((method
->flags
& METHOD_ATTRIBUTE_SPECIAL_NAME
) == 0)
219 if ((method
->name
[0] != '.') || strcmp (".ctor", method
->name
))
221 sig
= mono_method_signature (method
);
222 if (sig
&& (sig
->param_count
== 0))
230 * mono_security_core_clr_check_inheritance:
232 * Determine if the specified class can inherit from its parent using
233 * the CoreCLR inheritance rules.
235 * Base Type Allow Derived Type
236 * ------------ ------------------
237 * Transparent Transparent, SafeCritical, Critical
238 * SafeCritical SafeCritical, Critical
241 * Reference: http://msdn.microsoft.com/en-us/magazine/cc765416.aspx#id0190030
243 * Furthermore a class MUST have a default constructor if its base
244 * class has a non-transparent, public or protected, default constructor.
245 * The same inheritance rule applies to both default constructors.
247 * Reference: message from a SecurityException in SL4RC
248 * Reference: fxcop CA2132 rule
251 mono_security_core_clr_check_inheritance (MonoClass
*klass
)
253 MonoSecurityCoreCLRLevel class_level
, parent_level
;
254 MonoClass
*parent
= klass
->parent
;
259 class_level
= mono_security_core_clr_class_level (klass
);
260 parent_level
= mono_security_core_clr_class_level (parent
);
262 if (class_level
< parent_level
) {
263 set_type_load_exception_type (
264 "Inheritance failure for type %s. Parent class %s is more restricted.",
267 MonoMethod
*parent_ctor
= get_default_ctor (parent
);
268 if (parent_ctor
&& ((parent_ctor
->flags
& METHOD_ATTRIBUTE_PUBLIC
) != 0)) {
269 class_level
= mono_security_core_clr_method_level (get_default_ctor (klass
), FALSE
);
270 parent_level
= mono_security_core_clr_method_level (parent_ctor
, FALSE
);
271 if (class_level
< parent_level
) {
272 set_type_load_exception_type (
273 "Inheritance failure for type %s. Default constructor security mismatch with %s.",
281 * mono_security_core_clr_check_override:
283 * Determine if the specified override can "legally" override the
284 * specified base method using the CoreCLR inheritance rules.
286 * Base (virtual/interface) Allowed override
287 * ------------------------ -------------------------
288 * Transparent Transparent, SafeCritical
289 * SafeCritical Transparent, SafeCritical
292 * Reference: http://msdn.microsoft.com/en-us/magazine/cc765416.aspx#id0190030
295 mono_security_core_clr_check_override (MonoClass
*klass
, MonoMethod
*override
, MonoMethod
*base
)
297 MonoSecurityCoreCLRLevel base_level
= mono_security_core_clr_method_level (base
, FALSE
);
298 MonoSecurityCoreCLRLevel override_level
= mono_security_core_clr_method_level (override
, FALSE
);
299 /* if the base method is decorated with [SecurityCritical] then the overrided method MUST be too */
300 if (base_level
== MONO_SECURITY_CORE_CLR_CRITICAL
) {
301 if (override_level
!= MONO_SECURITY_CORE_CLR_CRITICAL
) {
302 set_type_load_exception_methods (
303 "Override failure for %s over %s. Override MUST be [SecurityCritical].",
307 /* base is [SecuritySafeCritical] or [SecurityTransparent], override MUST NOT be [SecurityCritical] */
308 if (override_level
== MONO_SECURITY_CORE_CLR_CRITICAL
) {
309 set_type_load_exception_methods (
310 "Override failure for %s over %s. Override must NOT be [SecurityCritical].",
317 * get_caller_no_reflection_related:
319 * Find the first managed caller that is either:
320 * (a) located outside the platform code assemblies; or
321 * (b) not related to reflection and delegates
323 * Returns TRUE to stop the stackwalk, FALSE to continue to the next frame.
326 get_caller_no_reflection_related (MonoMethod
*m
, gint32 no
, gint32 ilo
, gboolean managed
, gpointer data
)
328 MonoMethod
**dest
= (MonoMethod
**)data
;
331 /* skip unmanaged frames */
335 if (m
->wrapper_type
!= MONO_WRAPPER_NONE
)
338 /* quick out (any namespace not starting with an 'S' */
339 ns
= m
->klass
->name_space
;
340 if (!ns
|| (*ns
!= 'S')) {
345 /* stop if the method is not part of platform code */
346 if (!mono_security_core_clr_is_platform_image (m
->klass
->image
)) {
351 /* any number of calls inside System.Reflection are allowed */
352 if (strcmp (ns
, "System.Reflection") == 0)
355 /* any number of calls inside System.Reflection are allowed */
356 if (strcmp (ns
, "System.Reflection.Emit") == 0)
359 /* calls from System.Delegate are also possible and allowed */
360 if (strcmp (ns
, "System") == 0) {
361 const char *kname
= m
->klass
->name
;
362 if ((*kname
== 'A') && (strcmp (kname
, "Activator") == 0))
365 /* unlike most Invoke* cases InvokeMember is not inside System.Reflection[.Emit] but is SecuritySafeCritical */
366 if (((*kname
== 'T') && (strcmp (kname
, "Type") == 0)) ||
367 ((*kname
== 'R') && (strcmp (kname
, "RuntimeType")) == 0)) {
369 /* if calling InvokeMember then we can't stop the stackwalk here and need to look at the caller */
370 if (strcmp (m
->name
, "InvokeMember") == 0)
374 /* the security check on the delegate is made at creation time, not at invoke time */
375 if (((*kname
== 'D') && (strcmp (kname
, "Delegate") == 0)) ||
376 ((*kname
== 'M') && (strcmp (kname
, "MulticastDelegate")) == 0)) {
378 /* if we're invoking then we can stop our stack walk */
379 if (strcmp (m
->name
, "DynamicInvoke") != 0)
394 * get_reflection_caller:
396 * Walk to the first managed method outside:
397 * - System.Reflection* namespaces
398 * - System.[Multicast]Delegate or Activator type
400 * and return a pointer to its MonoMethod.
402 * This is required since CoreCLR checks needs to be done on this "real" caller.
405 get_reflection_caller (void)
407 MonoMethod
*m
= NULL
;
408 mono_stack_walk_no_il (get_caller_no_reflection_related
, &m
);
409 if (G_UNLIKELY (!m
)) {
410 mono_trace (G_LOG_LEVEL_WARNING
, MONO_TRACE_SECURITY
, "No caller outside reflection was found");
418 } ElevatedTrustCookie
;
421 * get_caller_of_elevated_trust_code
423 * Stack walk to find who is calling code requiring Elevated Trust.
424 * If a critical method is found then the caller is platform code
425 * and has elevated trust, otherwise (transparent) a check needs to
426 * be done (on the managed side) to determine if the application is
427 * running with elevated permissions.
430 get_caller_of_elevated_trust_code (MonoMethod
*m
, gint32 no
, gint32 ilo
, gboolean managed
, gpointer data
)
432 ElevatedTrustCookie
*cookie
= (ElevatedTrustCookie
*)data
;
434 /* skip unmanaged frames and wrappers */
435 if (!managed
|| (m
->wrapper_type
!= MONO_WRAPPER_NONE
))
438 /* end stack walk if we find ourselves outside platform code (we won't find critical code anymore) */
439 if (!mono_security_core_clr_is_platform_image (m
->klass
->image
)) {
444 switch (cookie
->depth
) {
445 /* while depth == 0 look for SecurityManager::[Check|Ensure]ElevatedPermissions */
447 if (strcmp (m
->klass
->name_space
, "System.Security"))
449 if (strcmp (m
->klass
->name
, "SecurityManager"))
451 if ((strcmp (m
->name
, "EnsureElevatedPermissions")) && strcmp (m
->name
, "CheckElevatedPermissions"))
455 /* while depth == 1 look for the caller to SecurityManager::[Check|Ensure]ElevatedPermissions */
457 /* this frame is [SecuritySafeCritical] because it calls [SecurityCritical] [Check|Ensure]ElevatedPermissions */
458 /* the next frame will contain the caller(s) we want to check */
461 /* while depth >= 2 look for [safe]critical caller, end stack walk if we find it */
464 /* if the caller is transparent then we continue the stack walk */
465 if (mono_security_core_clr_method_level (m
, TRUE
) == MONO_SECURITY_CORE_CLR_TRANSPARENT
)
468 /* Security[Safe]Critical code is always allowed to call elevated-trust code */
477 * mono_security_core_clr_require_elevated_permissions:
479 * Return TRUE if the caller of the current method (the code who
480 * called SecurityManager.get_RequiresElevatedPermissions) needs
481 * elevated trust to perform an action.
483 * A stack walk is done to find the callers. If one of the callers
484 * is either [SecurityCritical] or [SecuritySafeCritical] then the
485 * action is needed for platform code (i.e. no restriction).
486 * Otherwise (transparent) the requested action needs elevated trust
489 mono_security_core_clr_require_elevated_permissions (void)
491 ElevatedTrustCookie cookie
;
493 cookie
.caller
= NULL
;
494 mono_stack_walk_no_il (get_caller_of_elevated_trust_code
, &cookie
);
496 /* return TRUE if the stack walk did not reach far enough or did not find callers */
497 if (!cookie
.caller
|| cookie
.depth
< 3)
500 /* return TRUE if the caller is transparent, i.e. if elevated trust is required to continue executing the method */
501 return (mono_security_core_clr_method_level (cookie
.caller
, TRUE
) == MONO_SECURITY_CORE_CLR_TRANSPARENT
);
506 * check_field_access:
508 * Return TRUE if the caller method can access the specified field, FALSE otherwise.
511 check_field_access (MonoMethod
*caller
, MonoClassField
*field
)
513 /* if get_reflection_caller returns NULL then we assume the caller has NO privilege */
518 /* this check can occur before the field's type is resolved (and that can fail) */
519 mono_field_get_type_checked (field
, &error
);
520 if (!mono_error_ok (&error
)) {
521 mono_error_cleanup (&error
);
525 klass
= (mono_field_get_flags (field
) & FIELD_ATTRIBUTE_STATIC
) ? NULL
: mono_field_get_parent (field
);
526 return mono_method_can_access_field_full (caller
, field
, klass
);
532 * check_method_access:
534 * Return TRUE if the caller method can access the specified callee method, FALSE otherwise.
537 check_method_access (MonoMethod
*caller
, MonoMethod
*callee
)
539 /* if get_reflection_caller returns NULL then we assume the caller has NO privilege */
541 MonoClass
*klass
= (callee
->flags
& METHOD_ATTRIBUTE_STATIC
) ? NULL
: callee
->klass
;
542 return mono_method_can_access_method_full (caller
, callee
, klass
);
548 * get_argument_exception
550 * Helper function to create an MonoException (ArgumentException in
551 * managed-land) and provide a descriptive message for it. This
552 * message is also, optionally, being logged (export
553 * MONO_LOG_MASK="security") for debugging purposes.
555 static MonoException
*
556 get_argument_exception (const char *format
, MonoMethod
*caller
, MonoMethod
*callee
)
559 char *caller_name
= get_method_full_name (caller
);
560 char *callee_name
= get_method_full_name (callee
);
561 char *message
= g_strdup_printf (format
, caller_name
, callee_name
);
562 g_free (callee_name
);
563 g_free (caller_name
);
565 mono_trace (G_LOG_LEVEL_WARNING
, MONO_TRACE_SECURITY
, "%s", message
);
566 ex
= mono_get_exception_argument ("method", message
);
573 * get_field_access_exception
575 * Helper function to create an MonoException (FieldAccessException
576 * in managed-land) and provide a descriptive message for it. This
577 * message is also, optionally, being logged (export
578 * MONO_LOG_MASK="security") for debugging purposes.
580 static MonoException
*
581 get_field_access_exception (const char *format
, MonoMethod
*caller
, MonoClassField
*field
)
584 char *caller_name
= get_method_full_name (caller
);
585 char *field_name
= mono_field_full_name (field
);
586 char *message
= g_strdup_printf (format
, caller_name
, field_name
);
588 g_free (caller_name
);
590 mono_trace (G_LOG_LEVEL_WARNING
, MONO_TRACE_SECURITY
, "%s", message
);
591 ex
= mono_get_exception_field_access_msg (message
);
598 * get_method_access_exception
600 * Helper function to create an MonoException (MethodAccessException
601 * in managed-land) and provide a descriptive message for it. This
602 * message is also, optionally, being logged (export
603 * MONO_LOG_MASK="security") for debugging purposes.
605 static MonoException
*
606 get_method_access_exception (const char *format
, MonoMethod
*caller
, MonoMethod
*callee
)
609 char *caller_name
= get_method_full_name (caller
);
610 char *callee_name
= get_method_full_name (callee
);
611 char *message
= g_strdup_printf (format
, caller_name
, callee_name
);
612 g_free (callee_name
);
613 g_free (caller_name
);
615 mono_trace (G_LOG_LEVEL_WARNING
, MONO_TRACE_SECURITY
, "%s", message
);
616 ex
= mono_get_exception_method_access_msg (message
);
623 * mono_security_core_clr_ensure_reflection_access_field:
625 * Ensure that the specified field can be used with reflection since
626 * Transparent code cannot access to Critical fields and can only use
627 * them if they are visible from it's point of view.
629 * Returns TRUE if acess is allowed. Otherwise returns FALSE and sets @error to a FieldAccessException if the field is cannot be accessed.
632 mono_security_core_clr_ensure_reflection_access_field (MonoClassField
*field
, MonoError
*error
)
634 mono_error_init (error
);
635 MonoMethod
*caller
= get_reflection_caller ();
636 /* CoreCLR restrictions applies to Transparent code/caller */
637 if (mono_security_core_clr_method_level (caller
, TRUE
) != MONO_SECURITY_CORE_CLR_TRANSPARENT
)
640 if (mono_security_core_clr_get_options () & MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_REFLECTION
) {
641 if (!mono_security_core_clr_is_platform_image (mono_field_get_parent(field
)->image
))
645 /* Transparent code cannot [get|set]value on Critical fields */
646 if (mono_security_core_clr_class_level (mono_field_get_parent (field
)) == MONO_SECURITY_CORE_CLR_CRITICAL
) {
647 mono_error_set_exception_instance (error
, get_field_access_exception (
648 "Transparent method %s cannot get or set Critical field %s.",
653 /* also it cannot access a fields that is not visible from it's (caller) point of view */
654 if (!check_field_access (caller
, field
)) {
655 mono_error_set_exception_instance (error
, get_field_access_exception (
656 "Transparent method %s cannot get or set private/internal field %s.",
664 * mono_security_core_clr_ensure_reflection_access_method:
666 * Ensure that the specified method can be used with reflection since
667 * Transparent code cannot call Critical methods and can only call them
668 * if they are visible from it's point of view.
670 * If access is allowed returns TRUE. Returns FALSE and sets @error to a MethodAccessException if the field is cannot be accessed.
673 mono_security_core_clr_ensure_reflection_access_method (MonoMethod
*method
, MonoError
*error
)
675 mono_error_init (error
);
676 MonoMethod
*caller
= get_reflection_caller ();
677 /* CoreCLR restrictions applies to Transparent code/caller */
678 if (mono_security_core_clr_method_level (caller
, TRUE
) != MONO_SECURITY_CORE_CLR_TRANSPARENT
)
681 if (mono_security_core_clr_get_options () & MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_REFLECTION
) {
682 if (!mono_security_core_clr_is_platform_image (method
->klass
->image
))
686 /* Transparent code cannot invoke, even using reflection, Critical code */
687 if (mono_security_core_clr_method_level (method
, TRUE
) == MONO_SECURITY_CORE_CLR_CRITICAL
) {
688 mono_error_set_exception_instance (error
, get_method_access_exception (
689 "Transparent method %s cannot invoke Critical method %s.",
694 /* also it cannot invoke a method that is not visible from it's (caller) point of view */
695 if (!check_method_access (caller
, method
)) {
696 mono_error_set_exception_instance (error
, get_method_access_exception (
697 "Transparent method %s cannot invoke private/internal method %s.",
705 * can_avoid_corlib_reflection_delegate_optimization:
707 * Mono's mscorlib use delegates to optimize PropertyInfo and EventInfo
708 * reflection calls. This requires either a bunch of additional, and not
709 * really required, [SecuritySafeCritical] in the class libraries or
710 * (like this) a way to skip them. As a bonus we also avoid the stack
711 * walk to find the caller.
713 * Return TRUE if we can skip this "internal" delegate creation, FALSE
717 can_avoid_corlib_reflection_delegate_optimization (MonoMethod
*method
)
719 if (!mono_security_core_clr_is_platform_image (method
->klass
->image
))
722 if (strcmp (method
->klass
->name_space
, "System.Reflection") != 0)
725 if (strcmp (method
->klass
->name
, "MonoProperty") == 0) {
726 if ((strcmp (method
->name
, "GetterAdapterFrame") == 0) || strcmp (method
->name
, "StaticGetterAdapterFrame") == 0)
728 } else if (strcmp (method
->klass
->name
, "EventInfo") == 0) {
729 if ((strcmp (method
->name
, "AddEventFrame") == 0) || strcmp (method
->name
, "StaticAddEventAdapterFrame") == 0)
737 * mono_security_core_clr_ensure_delegate_creation:
739 * Return TRUE if a delegate can be created on the specified
740 * method. CoreCLR can also affect the binding, this function may
741 * return (FALSE) and set @error to an ArgumentException.
743 * @error is set to a MethodAccessException if the specified method is not
744 * visible from the caller point of view.
747 mono_security_core_clr_ensure_delegate_creation (MonoMethod
*method
, MonoError
*error
)
751 mono_error_init (error
);
753 /* note: mscorlib creates delegates to avoid reflection (optimization), we ignore those cases */
754 if (can_avoid_corlib_reflection_delegate_optimization (method
))
757 caller
= get_reflection_caller ();
758 /* if the "real" caller is not Transparent then it do can anything */
759 if (mono_security_core_clr_method_level (caller
, TRUE
) != MONO_SECURITY_CORE_CLR_TRANSPARENT
)
762 /* otherwise it (as a Transparent caller) cannot create a delegate on a Critical method... */
763 if (mono_security_core_clr_method_level (method
, TRUE
) == MONO_SECURITY_CORE_CLR_CRITICAL
) {
764 mono_error_set_exception_instance (error
, get_argument_exception (
765 "Transparent method %s cannot create a delegate on Critical method %s.",
770 if (mono_security_core_clr_get_options () & MONO_SECURITY_CORE_CLR_OPTIONS_RELAX_DELEGATE
) {
771 if (!mono_security_core_clr_is_platform_image (method
->klass
->image
))
775 /* also it cannot create the delegate on a method that is not visible from it's (caller) point of view */
776 if (!check_method_access (caller
, method
)) {
777 mono_error_set_exception_instance (error
, get_method_access_exception (
778 "Transparent method %s cannot create a delegate on private/internal method %s.",
787 * mono_security_core_clr_ensure_dynamic_method_resolved_object:
789 * Called from mono_reflection_create_dynamic_method (reflection.c) to add some extra checks required for CoreCLR.
790 * Dynamic methods needs to check to see if the objects being used (e.g. methods, fields) comes from platform code
791 * and do an accessibility check in this case. Otherwise (i.e. user/application code) can be used without this extra
792 * accessbility check.
795 mono_security_core_clr_ensure_dynamic_method_resolved_object (gpointer ref
, MonoClass
*handle_class
)
797 /* XXX find/create test cases for other handle_class XXX */
798 if (handle_class
== mono_defaults
.fieldhandle_class
) {
799 MonoClassField
*field
= (MonoClassField
*) ref
;
800 MonoClass
*klass
= mono_field_get_parent (field
);
801 /* fields coming from platform code have extra protection (accessibility check) */
802 if (mono_security_core_clr_is_platform_image (klass
->image
)) {
803 MonoMethod
*caller
= get_reflection_caller ();
804 /* XXX Critical code probably can do this / need some test cases (safer off otherwise) XXX */
805 if (!check_field_access (caller
, field
)) {
806 return get_field_access_exception (
807 "Dynamic method %s cannot create access private/internal field %s.",
811 } else if (handle_class
== mono_defaults
.methodhandle_class
) {
812 MonoMethod
*method
= (MonoMethod
*) ref
;
813 /* methods coming from platform code have extra protection (accessibility check) */
814 if (mono_security_core_clr_is_platform_image (method
->klass
->image
)) {
815 MonoMethod
*caller
= get_reflection_caller ();
816 /* XXX Critical code probably can do this / need some test cases (safer off otherwise) XXX */
817 if (!check_method_access (caller
, method
)) {
818 return get_method_access_exception (
819 "Dynamic method %s cannot create access private/internal method %s.",
828 * mono_security_core_clr_can_access_internals
830 * Check if we allow [InternalsVisibleTo] to work between two images.
833 mono_security_core_clr_can_access_internals (MonoImage
*accessing
, MonoImage
* accessed
)
835 /* are we trying to access internals of a platform assembly ? if not this is acceptable */
836 if (!mono_security_core_clr_is_platform_image (accessed
))
839 /* we can't let everyone with the right name and public key token access the internals of platform code.
840 * (Silverlight can rely on the strongname signature of the assemblies, but Mono does not verify them)
841 * However platform code is fully trusted so it can access the internals of other platform code assemblies */
842 if (mono_security_core_clr_is_platform_image (accessing
))
845 /* catch-22: System.Xml needs access to mscorlib's internals (e.g. ArrayList) but is not considered platform code.
846 * Promoting it to platform code would create another issue since (both Mono/Moonlight or MS version of)
847 * System.Xml.Linq.dll (an SDK, not platform, assembly) needs access to System.Xml.dll internals (either ).
848 * The solution is to trust, even transparent code, in the plugin directory to access platform code internals */
849 if (!accessed
->assembly
->basedir
|| !accessing
->assembly
->basedir
)
851 return (strcmp (accessed
->assembly
->basedir
, accessing
->assembly
->basedir
) == 0);
855 * mono_security_core_clr_is_field_access_allowed
857 * Return a MonoException (FieldccessException in managed-land) if
858 * the access from "caller" to "field" is not valid under CoreCLR -
859 * i.e. a [SecurityTransparent] method calling a [SecurityCritical]
863 mono_security_core_clr_is_field_access_allowed (MonoMethod
*caller
, MonoClassField
*field
)
865 /* there's no restriction to access Transparent or SafeCritical fields, so we only check calls to Critical methods */
866 if (mono_security_core_clr_class_level (mono_field_get_parent (field
)) != MONO_SECURITY_CORE_CLR_CRITICAL
)
869 /* caller is Critical! only SafeCritical and Critical callers can access the field, so we throw if caller is Transparent */
870 if (!caller
|| (mono_security_core_clr_method_level (caller
, TRUE
) != MONO_SECURITY_CORE_CLR_TRANSPARENT
))
873 return get_field_access_exception (
874 "Transparent method %s cannot call use Critical field %s.",
879 * mono_security_core_clr_is_call_allowed
881 * Return a MonoException (MethodAccessException in managed-land) if
882 * the call from "caller" to "callee" is not valid under CoreCLR -
883 * i.e. a [SecurityTransparent] method calling a [SecurityCritical]
887 mono_security_core_clr_is_call_allowed (MonoMethod
*caller
, MonoMethod
*callee
)
889 /* there's no restriction to call Transparent or SafeCritical code, so we only check calls to Critical methods */
890 if (mono_security_core_clr_method_level (callee
, TRUE
) != MONO_SECURITY_CORE_CLR_CRITICAL
)
893 /* callee is Critical! only SafeCritical and Critical callers can call it, so we throw if the caller is Transparent */
894 if (!caller
|| (mono_security_core_clr_method_level (caller
, TRUE
) != MONO_SECURITY_CORE_CLR_TRANSPARENT
))
897 return get_method_access_exception (
898 "Transparent method %s cannot call Critical method %s.",
903 * mono_security_core_clr_level_from_cinfo:
905 * Return the MonoSecurityCoreCLRLevel that match the attribute located
906 * in the specified custom attributes. If no attribute is present it
907 * defaults to MONO_SECURITY_CORE_CLR_TRANSPARENT, which is the default
908 * level for all code under the CoreCLR.
910 static MonoSecurityCoreCLRLevel
911 mono_security_core_clr_level_from_cinfo (MonoCustomAttrInfo
*cinfo
, MonoImage
*image
)
913 int level
= MONO_SECURITY_CORE_CLR_TRANSPARENT
;
915 if (cinfo
&& mono_custom_attrs_has_attr (cinfo
, security_safe_critical_attribute ()))
916 level
= MONO_SECURITY_CORE_CLR_SAFE_CRITICAL
;
917 if (cinfo
&& mono_custom_attrs_has_attr (cinfo
, security_critical_attribute ()))
918 level
= MONO_SECURITY_CORE_CLR_CRITICAL
;
920 return (MonoSecurityCoreCLRLevel
)level
;
924 * mono_security_core_clr_class_level_no_platform_check:
926 * Return the MonoSecurityCoreCLRLevel for the specified class, without
927 * checking for platform code. This help us avoid multiple redundant
929 * - a check for the method and one for the class;
930 * - a check for the class and outer class(es) ...
932 static MonoSecurityCoreCLRLevel
933 mono_security_core_clr_class_level_no_platform_check (MonoClass
*klass
)
935 MonoSecurityCoreCLRLevel level
= MONO_SECURITY_CORE_CLR_TRANSPARENT
;
936 MonoCustomAttrInfo
*cinfo
= mono_custom_attrs_from_class (klass
);
938 level
= mono_security_core_clr_level_from_cinfo (cinfo
, klass
->image
);
939 mono_custom_attrs_free (cinfo
);
942 if (level
== MONO_SECURITY_CORE_CLR_TRANSPARENT
&& klass
->nested_in
)
943 level
= mono_security_core_clr_class_level_no_platform_check (klass
->nested_in
);
949 * mono_security_core_clr_class_level:
951 * Return the MonoSecurityCoreCLRLevel for the specified class.
953 MonoSecurityCoreCLRLevel
954 mono_security_core_clr_class_level (MonoClass
*klass
)
956 /* non-platform code is always Transparent - whatever the attributes says */
957 if (!mono_security_core_clr_test
&& !mono_security_core_clr_is_platform_image (klass
->image
))
958 return MONO_SECURITY_CORE_CLR_TRANSPARENT
;
960 return mono_security_core_clr_class_level_no_platform_check (klass
);
964 * mono_security_core_clr_field_level:
966 * Return the MonoSecurityCoreCLRLevel for the specified field.
967 * If with_class_level is TRUE then the type (class) will also be
968 * checked, otherwise this will only report the information about
971 MonoSecurityCoreCLRLevel
972 mono_security_core_clr_field_level (MonoClassField
*field
, gboolean with_class_level
)
974 MonoCustomAttrInfo
*cinfo
;
975 MonoSecurityCoreCLRLevel level
= MONO_SECURITY_CORE_CLR_TRANSPARENT
;
977 /* if get_reflection_caller returns NULL then we assume the caller has NO privilege */
981 /* non-platform code is always Transparent - whatever the attributes says */
982 if (!mono_security_core_clr_test
&& !mono_security_core_clr_is_platform_image (field
->parent
->image
))
985 cinfo
= mono_custom_attrs_from_field (field
->parent
, field
);
987 level
= mono_security_core_clr_level_from_cinfo (cinfo
, field
->parent
->image
);
988 mono_custom_attrs_free (cinfo
);
991 if (with_class_level
&& level
== MONO_SECURITY_CORE_CLR_TRANSPARENT
)
992 level
= mono_security_core_clr_class_level (field
->parent
);
998 * mono_security_core_clr_method_level:
1000 * Return the MonoSecurityCoreCLRLevel for the specified method.
1001 * If with_class_level is TRUE then the type (class) will also be
1002 * checked, otherwise this will only report the information about
1003 * the method itself.
1005 MonoSecurityCoreCLRLevel
1006 mono_security_core_clr_method_level (MonoMethod
*method
, gboolean with_class_level
)
1008 MonoCustomAttrInfo
*cinfo
;
1009 MonoSecurityCoreCLRLevel level
= MONO_SECURITY_CORE_CLR_TRANSPARENT
;
1011 /* if get_reflection_caller returns NULL then we assume the caller has NO privilege */
1015 /* non-platform code is always Transparent - whatever the attributes says */
1016 if (!mono_security_core_clr_test
&& !mono_security_core_clr_is_platform_image (method
->klass
->image
))
1019 cinfo
= mono_custom_attrs_from_method (method
);
1021 level
= mono_security_core_clr_level_from_cinfo (cinfo
, method
->klass
->image
);
1022 mono_custom_attrs_free (cinfo
);
1025 if (with_class_level
&& level
== MONO_SECURITY_CORE_CLR_TRANSPARENT
)
1026 level
= mono_security_core_clr_class_level (method
->klass
);
1032 * mono_security_enable_core_clr:
1034 * Enable the verifier and the CoreCLR security model
1037 mono_security_enable_core_clr ()
1039 mono_verifier_set_mode (MONO_VERIFIER_MODE_VERIFIABLE
);
1040 mono_security_set_mode (MONO_SECURITY_MODE_CORE_CLR
);
1046 mono_security_core_clr_check_inheritance (MonoClass
*klass
)
1051 mono_security_core_clr_check_override (MonoClass
*klass
, MonoMethod
*override
, MonoMethod
*base
)
1056 mono_security_core_clr_require_elevated_permissions (void)
1062 mono_security_core_clr_ensure_reflection_access_field (MonoClassField
*field
, MonoError
*error
)
1064 mono_error_init (error
);
1069 mono_security_core_clr_ensure_reflection_access_method (MonoMethod
*method
, MonoError
*error
)
1071 mono_error_init (error
);
1076 mono_security_core_clr_ensure_delegate_creation (MonoMethod
*method
, MonoError
*error
)
1078 mono_error_init (error
);
1083 mono_security_core_clr_ensure_dynamic_method_resolved_object (gpointer ref
, MonoClass
*handle_class
)
1089 mono_security_core_clr_can_access_internals (MonoImage
*accessing
, MonoImage
* accessed
)
1095 mono_security_core_clr_is_field_access_allowed (MonoMethod
*caller
, MonoClassField
*field
)
1101 mono_security_core_clr_is_call_allowed (MonoMethod
*caller
, MonoMethod
*callee
)
1106 MonoSecurityCoreCLRLevel
1107 mono_security_core_clr_class_level (MonoClass
*klass
)
1109 return MONO_SECURITY_CORE_CLR_TRANSPARENT
;
1112 MonoSecurityCoreCLRLevel
1113 mono_security_core_clr_field_level (MonoClassField
*field
, gboolean with_class_level
)
1115 return MONO_SECURITY_CORE_CLR_TRANSPARENT
;
1118 MonoSecurityCoreCLRLevel
1119 mono_security_core_clr_method_level (MonoMethod
*method
, gboolean with_class_level
)
1121 return MONO_SECURITY_CORE_CLR_TRANSPARENT
;
1125 mono_security_enable_core_clr ()
1129 #endif /* DISABLE_SECURITY */