2 * security.c: Security internal calls
5 * Sebastien Pouliot <sebastien@ximian.com>
7 * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
14 #include <mono/metadata/assembly.h>
15 #include <mono/metadata/appdomain.h>
16 #include <mono/metadata/image.h>
17 #include <mono/metadata/exception.h>
18 #include <mono/metadata/object-internals.h>
19 #include <mono/metadata/metadata-internals.h>
20 #include <mono/metadata/security.h>
21 #include <mono/io-layer/io-layer.h>
22 #include <mono/utils/strenc.h>
29 #ifndef PROTECTED_DACL_SECURITY_INFORMATION
30 #define PROTECTED_DACL_SECURITY_INFORMATION 0x80000000L
44 #include <sys/types.h>
51 #ifndef HAVE_GETGRGID_R
52 #warning Non-thread safe getgrgid being used!
54 #ifndef HAVE_GETGRNAM_R
55 #warning Non-thread safe getgrnam being used!
57 #ifndef HAVE_GETPWNAM_R
58 #warning Non-thread safe getpwnam being used!
60 #ifndef HAVE_GETPWUID_R
61 #warning Non-thread safe getpwuid being used!
64 #endif /* defined(__GNUC__) */
66 #endif /* not HOST_WIN32 */
69 /* internal functions - reuse driven */
73 /* ask a server to translate a SID into a textual representation */
75 GetSidName (gunichar2 *server, PSID sid, gint32 *size)
77 gunichar2 *uniname = NULL;
80 SID_NAME_USE peUse; /* out */
82 LookupAccountSid (server, sid, NULL, &cchName, NULL,
85 if ((cchName > 0) && (cchDomain > 0)) {
86 gunichar2 *user = g_malloc0 ((cchName + 1) * 2);
87 gunichar2 *domain = g_malloc0 ((cchDomain + 1) * 2);
89 LookupAccountSid (server, sid, user, &cchName, domain,
94 /* domain/machine name included (+ sepearator) */
95 *size = cchName + cchDomain + 1;
96 uniname = g_malloc0 ((*size + 1) * 2);
97 memcpy (uniname, domain, cchDomain * 2);
98 *(uniname + cchDomain) = '\\';
99 memcpy (uniname + cchDomain + 1, user, cchName * 2);
103 /* no domain / machine */
109 /* nothing -> return NULL */
120 #else /* not HOST_WIN32 */
122 #define MONO_SYSCONF_DEFAULT_SIZE ((size_t) 1024)
125 * Ensure we always get a valid (usable) value from sysconf.
126 * In case of error, we return the default value.
128 static size_t mono_sysconf (int name)
130 size_t size = (size_t) sysconf (name);
132 return (size == -1) ? MONO_SYSCONF_DEFAULT_SIZE : size;
137 GetTokenName (uid_t uid)
141 #ifdef HAVE_GETPWUID_R
147 struct passwd *p = NULL;
150 #ifdef HAVE_GETPWUID_R
151 #ifdef _SC_GETPW_R_SIZE_MAX
152 fbufsize = mono_sysconf (_SC_GETPW_R_SIZE_MAX);
154 fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
156 fbuf = (gchar *)g_malloc0 (fbufsize);
157 retval = getpwuid_r (uid, &pwd, fbuf, fbufsize, &p);
158 result = ((retval == 0) && (p == &pwd));
160 /* default to non thread-safe but posix compliant function */
162 result = (p != NULL);
166 uname = g_strdup (p->pw_name);
169 #ifdef HAVE_GETPWUID_R
178 IsMemberInList (uid_t user, struct group *g)
180 gboolean result = FALSE;
181 gchar *utf8_username = GetTokenName (user);
187 gchar **users = g->gr_mem;
191 if (strcmp (utf8_username, u) == 0) {
199 g_free (utf8_username);
205 IsDefaultGroup (uid_t user, gid_t group)
207 #ifdef HAVE_GETPWUID_R
213 struct passwd *p = NULL;
216 #ifdef HAVE_GETPWUID_R
217 #ifdef _SC_GETPW_R_SIZE_MAX
218 fbufsize = mono_sysconf (_SC_GETPW_R_SIZE_MAX);
220 fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
223 fbuf = (gchar *)g_malloc0 (fbufsize);
224 retval = getpwuid_r (user, &pwd, fbuf, fbufsize, &p);
225 result = ((retval == 0) && (p == &pwd));
227 /* default to non thread-safe but posix compliant function */
229 result = (p != NULL);
233 result = (p->pw_gid == group);
236 #ifdef HAVE_GETPWUID_R
245 IsMemberOf (gid_t user, struct group *g)
250 /* is it the user default group */
251 if (IsDefaultGroup (user, g->gr_gid))
254 /* is the user in the group list */
255 return IsMemberInList (user, g);
264 /* System.Security.Principal.WindowsIdentity */
268 ves_icall_System_Security_Principal_WindowsIdentity_GetCurrentToken (void)
270 gpointer token = NULL;
273 /* Note: This isn't a copy of the Token - we must not close it!!!
274 * http://www.develop.com/kbrown/book/html/whatis_windowsprincipal.html
277 /* thread may be impersonating somebody */
278 if (OpenThreadToken (GetCurrentThread (), TOKEN_QUERY, 1, &token) == 0) {
279 /* if not take the process identity */
280 OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &token);
283 token = GINT_TO_POINTER (geteuid ());
290 ves_icall_System_Security_Principal_WindowsIdentity_GetTokenName (gpointer token)
293 MonoString *result = NULL;
294 gunichar2 *uniname = NULL;
297 mono_error_init (&error);
299 GetTokenInformation (token, TokenUser, NULL, size, (PDWORD)&size);
301 TOKEN_USER *tu = g_malloc0 (size);
302 if (GetTokenInformation (token, TokenUser, tu, size, (PDWORD)&size)) {
303 uniname = GetSidName (NULL, tu->User.Sid, &size);
308 gchar *uname = GetTokenName ((uid_t) GPOINTER_TO_INT (token));
311 size = strlen (uname);
312 uniname = g_utf8_to_utf16 (uname, size, NULL, NULL, NULL);
315 #endif /* HOST_WIN32 */
318 result = mono_string_new_utf16_checked (mono_domain_get (), uniname, size, &error);
321 result = mono_string_new (mono_domain_get (), "");
326 mono_error_set_pending_exception (&error);
332 ves_icall_System_Security_Principal_WindowsIdentity_GetUserToken (MonoString *username)
335 gpointer token = NULL;
337 /* TODO: MS has something like this working in Windows 2003 (client and
338 * server) but works only for domain accounts (so it's quite limiting).
339 * http://www.develop.com/kbrown/book/html/howto_logonuser.html
341 g_warning ("Unsupported on Win32 (anyway requires W2K3 minimum)");
343 #else /* HOST_WIN32*/
345 #ifdef HAVE_GETPWNAM_R
351 gpointer token = (gpointer) -2;
356 utf8_name = mono_unicode_to_external (mono_string_chars (username));
358 #ifdef HAVE_GETPWNAM_R
359 #ifdef _SC_GETPW_R_SIZE_MAX
360 fbufsize = mono_sysconf (_SC_GETPW_R_SIZE_MAX);
362 fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
365 fbuf = (gchar *)g_malloc0 (fbufsize);
366 retval = getpwnam_r (utf8_name, &pwd, fbuf, fbufsize, &p);
367 result = ((retval == 0) && (p == &pwd));
369 /* default to non thread-safe but posix compliant function */
370 p = getpwnam (utf8_name);
371 result = (p != NULL);
375 token = GINT_TO_POINTER (p->pw_uid);
378 #ifdef HAVE_GETPWNAM_R
387 /* http://www.dotnet247.com/247reference/msgs/39/195403.aspx
388 // internal static string[] WindowsIdentity._GetRoles (IntPtr token)
391 ves_icall_System_Security_Principal_WindowsIdentity_GetRoles (gpointer token)
393 MonoArray *array = NULL;
394 MonoDomain *domain = mono_domain_get ();
399 GetTokenInformation (token, TokenGroups, NULL, size, (PDWORD)&size);
401 TOKEN_GROUPS *tg = g_malloc0 (size);
402 if (GetTokenInformation (token, TokenGroups, tg, size, (PDWORD)&size)) {
404 int num = tg->GroupCount;
406 array = mono_array_new (domain, mono_get_string_class (), num);
408 for (i=0; i < num; i++) {
410 gunichar2 *uniname = GetSidName (NULL, tg->Groups [i].Sid, &size);
413 MonoString *str = mono_string_new_utf16_checked (domain, uniname, size, &error);
414 if (!is_ok (&error)) {
417 mono_error_set_pending_exception (&error);
420 mono_array_setref (array, i, str);
428 /* POSIX-compliant systems should use IsMemberOfGroupId or IsMemberOfGroupName */
429 g_warning ("WindowsIdentity._GetRoles should never be called on POSIX");
432 /* return empty array of string, i.e. string [0] */
433 array = mono_array_new (domain, mono_get_string_class (), 0);
439 /* System.Security.Principal.WindowsImpersonationContext */
443 ves_icall_System_Security_Principal_WindowsImpersonationContext_CloseToken (gpointer token)
445 gboolean result = TRUE;
448 result = (CloseHandle (token) != 0);
455 ves_icall_System_Security_Principal_WindowsImpersonationContext_DuplicateToken (gpointer token)
457 gpointer dupe = NULL;
460 if (DuplicateToken (token, SecurityImpersonation, &dupe) == 0) {
471 ves_icall_System_Security_Principal_WindowsImpersonationContext_SetCurrentToken (gpointer token)
473 /* Posix version implemented in /mono/mono/io-layer/security.c */
474 return (ImpersonateLoggedOnUser (token) != 0);
479 ves_icall_System_Security_Principal_WindowsImpersonationContext_RevertToSelf (void)
481 /* Posix version implemented in /mono/mono/io-layer/security.c */
482 return (RevertToSelf () != 0);
486 /* System.Security.Principal.WindowsPrincipal */
489 ves_icall_System_Security_Principal_WindowsPrincipal_IsMemberOfGroupId (gpointer user, gpointer group)
491 gboolean result = FALSE;
494 /* The convertion from an ID to a string is done in managed code for Windows */
495 g_warning ("IsMemberOfGroupId should never be called on Win32");
497 #else /* HOST_WIN32 */
499 #ifdef HAVE_GETGRGID_R
505 struct group *g = NULL;
507 #ifdef HAVE_GETGRGID_R
508 #ifdef _SC_GETGR_R_SIZE_MAX
509 fbufsize = mono_sysconf (_SC_GETGR_R_SIZE_MAX);
511 fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
513 fbuf = (gchar *)g_malloc0 (fbufsize);
514 retval = getgrgid_r ((gid_t) GPOINTER_TO_INT (group), &grp, fbuf, fbufsize, &g);
515 result = ((retval == 0) && (g == &grp));
517 /* default to non thread-safe but posix compliant function */
518 g = getgrgid ((gid_t) GPOINTER_TO_INT (group));
519 result = (g != NULL);
523 result = IsMemberOf ((uid_t) GPOINTER_TO_INT (user), g);
526 #ifdef HAVE_GETGRGID_R
530 #endif /* HOST_WIN32 */
537 ves_icall_System_Security_Principal_WindowsPrincipal_IsMemberOfGroupName (gpointer user, MonoString *group)
539 gboolean result = FALSE;
542 /* Windows version use a cache built using WindowsIdentity._GetRoles */
543 g_warning ("IsMemberOfGroupName should never be called on Win32");
545 #else /* HOST_WIN32 */
546 gchar *utf8_groupname;
548 utf8_groupname = mono_unicode_to_external (mono_string_chars (group));
549 if (utf8_groupname) {
550 struct group *g = NULL;
551 #ifdef HAVE_GETGRNAM_R
555 #ifdef _SC_GETGR_R_SIZE_MAX
556 size_t fbufsize = mono_sysconf (_SC_GETGR_R_SIZE_MAX);
558 size_t fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
560 fbuf = (gchar *)g_malloc0 (fbufsize);
561 retval = getgrnam_r (utf8_groupname, &grp, fbuf, fbufsize, &g);
562 result = ((retval == 0) && (g == &grp));
564 /* default to non thread-safe but posix compliant function */
565 g = getgrnam (utf8_groupname);
566 result = (g != NULL);
570 result = IsMemberOf ((uid_t) GPOINTER_TO_INT (user), g);
573 #ifdef HAVE_GETGRNAM_R
576 g_free (utf8_groupname);
578 #endif /* HOST_WIN32 */
584 /* Mono.Security.Cryptography IO related internal calls */
589 GetAdministratorsSid (void)
591 SID_IDENTIFIER_AUTHORITY admins = SECURITY_NT_AUTHORITY;
593 if (!AllocateAndInitializeSid (&admins, 2, SECURITY_BUILTIN_DOMAIN_RID,
594 DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &pSid))
596 /* Note: this SID must be freed with FreeSid () */
602 GetEveryoneSid (void)
604 SID_IDENTIFIER_AUTHORITY everyone = SECURITY_WORLD_SID_AUTHORITY;
606 if (!AllocateAndInitializeSid (&everyone, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &pSid))
608 /* Note: this SID must be freed with FreeSid () */
614 GetCurrentUserSid (void)
618 gpointer token = ves_icall_System_Security_Principal_WindowsIdentity_GetCurrentToken ();
620 GetTokenInformation (token, TokenUser, NULL, size, (PDWORD)&size);
622 TOKEN_USER *tu = g_malloc0 (size);
623 if (GetTokenInformation (token, TokenUser, tu, size, (PDWORD)&size)) {
624 DWORD length = GetLengthSid (tu->User.Sid);
625 sid = (PSID) g_malloc0 (length);
626 if (!CopySid (length, sid, tu->User.Sid)) {
633 /* Note: this SID must be freed with g_free () */
639 GetRightsFromSid (PSID sid, PACL acl)
641 ACCESS_MASK rights = 0;
644 BuildTrusteeWithSidW (&trustee, sid);
645 if (GetEffectiveRightsFromAcl (acl, &trustee, &rights) != ERROR_SUCCESS)
653 IsMachineProtected (gunichar2 *path)
655 gboolean success = FALSE;
657 PSID pEveryoneSid = NULL;
659 DWORD dwRes = GetNamedSecurityInfoW (path, SE_FILE_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, &pDACL, NULL, NULL);
660 if (dwRes != ERROR_SUCCESS)
663 /* We check that Everyone is still limited to READ-ONLY -
664 but not if new entries have been added by an Administrator */
666 pEveryoneSid = GetEveryoneSid ();
668 ACCESS_MASK rights = GetRightsFromSid (pEveryoneSid, pDACL);
669 /* http://msdn.microsoft.com/library/en-us/security/security/generic_access_rights.asp?frame=true */
670 success = (rights == (READ_CONTROL | SYNCHRONIZE | FILE_READ_DATA | FILE_READ_EA | FILE_READ_ATTRIBUTES));
671 FreeSid (pEveryoneSid);
673 /* Note: we don't need to check our own access -
674 we'll know soon enough when reading the file */
684 IsUserProtected (gunichar2 *path)
686 gboolean success = FALSE;
688 PSID pEveryoneSid = NULL;
689 PSECURITY_DESCRIPTOR pSecurityDescriptor = NULL;
691 DWORD dwRes = GetNamedSecurityInfoW (path, SE_FILE_OBJECT,
692 DACL_SECURITY_INFORMATION, NULL, NULL, &pDACL, NULL, &pSecurityDescriptor);
693 if (dwRes != ERROR_SUCCESS)
696 /* We check that our original entries in the ACL are in place -
697 but not if new entries have been added by the user */
699 /* Everyone should be denied */
700 pEveryoneSid = GetEveryoneSid ();
702 ACCESS_MASK rights = GetRightsFromSid (pEveryoneSid, pDACL);
703 success = (rights == 0);
704 FreeSid (pEveryoneSid);
706 /* Note: we don't need to check our own access -
707 we'll know soon enough when reading the file */
709 if (pSecurityDescriptor)
710 LocalFree (pSecurityDescriptor);
717 ProtectMachine (gunichar2 *path)
719 PSID pEveryoneSid = GetEveryoneSid ();
720 PSID pAdminsSid = GetAdministratorsSid ();
723 if (pEveryoneSid && pAdminsSid) {
725 EXPLICIT_ACCESS ea [2];
726 ZeroMemory (&ea, 2 * sizeof (EXPLICIT_ACCESS));
728 /* grant all access to the BUILTIN\Administrators group */
729 BuildTrusteeWithSidW (&ea [0].Trustee, pAdminsSid);
730 ea [0].grfAccessPermissions = GENERIC_ALL;
731 ea [0].grfAccessMode = SET_ACCESS;
732 ea [0].grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
733 ea [0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
734 ea [0].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
736 /* read-only access everyone */
737 BuildTrusteeWithSidW (&ea [1].Trustee, pEveryoneSid);
738 ea [1].grfAccessPermissions = GENERIC_READ;
739 ea [1].grfAccessMode = SET_ACCESS;
740 ea [1].grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
741 ea [1].Trustee.TrusteeForm = TRUSTEE_IS_SID;
742 ea [1].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
744 retval = SetEntriesInAcl (2, ea, NULL, &pDACL);
745 if (retval == ERROR_SUCCESS) {
746 /* with PROTECTED_DACL_SECURITY_INFORMATION we */
747 /* remove any existing ACL (like inherited ones) */
748 retval = SetNamedSecurityInfo (path, SE_FILE_OBJECT,
749 DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION,
750 NULL, NULL, pDACL, NULL);
757 FreeSid (pEveryoneSid);
759 FreeSid (pAdminsSid);
760 return (retval == ERROR_SUCCESS);
765 ProtectUser (gunichar2 *path)
769 PSID pCurrentSid = GetCurrentUserSid ();
773 ZeroMemory (&ea, sizeof (EXPLICIT_ACCESS));
775 /* grant exclusive access to the current user */
776 BuildTrusteeWithSidW (&ea.Trustee, pCurrentSid);
777 ea.grfAccessPermissions = GENERIC_ALL;
778 ea.grfAccessMode = SET_ACCESS;
779 ea.grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
780 ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
781 ea.Trustee.TrusteeType = TRUSTEE_IS_USER;
783 retval = SetEntriesInAcl (1, &ea, NULL, &pDACL);
784 if (retval == ERROR_SUCCESS) {
785 /* with PROTECTED_DACL_SECURITY_INFORMATION we
786 remove any existing ACL (like inherited ones) */
787 retval = SetNamedSecurityInfo (path, SE_FILE_OBJECT,
788 DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION,
789 NULL, NULL, pDACL, NULL);
794 g_free (pCurrentSid); /* g_malloc0 */
797 return (retval == ERROR_SUCCESS);
803 IsProtected (MonoString *path, gint32 protection)
805 gboolean result = FALSE;
806 gchar *utf8_name = mono_unicode_to_external (mono_string_chars (path));
809 if (stat (utf8_name, &st) == 0) {
810 result = (((st.st_mode & 0777) & protection) == 0);
819 Protect (MonoString *path, gint32 file_mode, gint32 add_dir_mode)
821 gboolean result = FALSE;
822 gchar *utf8_name = mono_unicode_to_external (mono_string_chars (path));
825 if (stat (utf8_name, &st) == 0) {
826 int mode = file_mode;
827 if (st.st_mode & S_IFDIR)
828 mode |= add_dir_mode;
829 result = (chmod (utf8_name, mode) == 0);
836 #endif /* not HOST_WIN32 */
840 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_CanSecure (MonoString *root)
845 /* ACL are nice... unless you have FAT or other uncivilized filesystem */
846 if (!GetVolumeInformation (mono_string_chars (root), NULL, 0, NULL, NULL, (LPDWORD)&flags, NULL, 0))
848 return ((flags & FS_PERSISTENT_ACLS) == FS_PERSISTENT_ACLS);
850 /* we assume some kind of security is applicable outside Windows */
857 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_IsMachineProtected (MonoString *path)
859 gboolean ret = FALSE;
861 /* no one, but the owner, should have write access to the directory */
863 ret = IsMachineProtected (mono_string_chars (path));
865 ret = IsProtected (path, (S_IWGRP | S_IWOTH));
872 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_IsUserProtected (MonoString *path)
874 gboolean ret = FALSE;
876 /* no one, but the user, should have access to the directory */
878 ret = IsUserProtected (mono_string_chars (path));
880 ret = IsProtected (path, (S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH));
887 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_ProtectMachine (MonoString *path)
889 gboolean ret = FALSE;
891 /* read/write to owner, read to everyone else */
893 ret = ProtectMachine (mono_string_chars (path));
895 ret = Protect (path, (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH), (S_IXUSR | S_IXGRP | S_IXOTH));
902 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_ProtectUser (MonoString *path)
904 gboolean ret = FALSE;
906 /* read/write to user, no access to everyone else */
908 ret = ProtectUser (mono_string_chars (path));
910 ret = Protect (path, (S_IRUSR | S_IWUSR), S_IXUSR);
917 * Returns TRUE if there is "something" where the Authenticode signature is
918 * normally located. Returns FALSE is data directory is empty.
920 * Note: Neither the structure nor the signature is verified by this function.
923 ves_icall_System_Security_Policy_Evidence_IsAuthenticodePresent (MonoReflectionAssembly *refass)
925 if (refass && refass->assembly && refass->assembly->image) {
926 return mono_image_has_authenticode_entry (refass->assembly->image);
932 /* System.Security.SecureString related internal calls */
934 static MonoImage *system_security_assembly = NULL;
937 ves_icall_System_Security_SecureString_DecryptInternal (MonoArray *data, MonoObject *scope)
940 invoke_protected_memory_method (data, scope, FALSE, &error);
941 mono_error_set_pending_exception (&error);
944 ves_icall_System_Security_SecureString_EncryptInternal (MonoArray* data, MonoObject *scope)
947 invoke_protected_memory_method (data, scope, TRUE, &error);
948 mono_error_set_pending_exception (&error);
951 void invoke_protected_memory_method (MonoArray *data, MonoObject *scope, gboolean encrypt, MonoError *error)
957 mono_error_init (error);
959 if (system_security_assembly == NULL) {
960 system_security_assembly = mono_image_loaded ("System.Security");
961 if (!system_security_assembly) {
962 MonoAssembly *sa = mono_assembly_open ("System.Security.dll", NULL);
964 g_assert_not_reached ();
965 system_security_assembly = mono_assembly_get_image (sa);
969 klass = mono_class_load_from_name (system_security_assembly,
970 "System.Security.Cryptography", "ProtectedMemory");
971 method = mono_class_get_method_from_name (klass, encrypt ? "Protect" : "Unprotect", 2);
973 params [1] = scope; /* MemoryProtectionScope.SameProcess */
975 mono_runtime_invoke_checked (method, NULL, params, error);