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 = 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 = 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)
292 MonoString *result = NULL;
293 gunichar2 *uniname = NULL;
297 GetTokenInformation (token, TokenUser, NULL, size, (PDWORD)&size);
299 TOKEN_USER *tu = g_malloc0 (size);
300 if (GetTokenInformation (token, TokenUser, tu, size, (PDWORD)&size)) {
301 uniname = GetSidName (NULL, tu->User.Sid, &size);
306 gchar *uname = GetTokenName ((uid_t) GPOINTER_TO_INT (token));
309 size = strlen (uname);
310 uniname = g_utf8_to_utf16 (uname, size, NULL, NULL, NULL);
313 #endif /* HOST_WIN32 */
316 result = mono_string_new_utf16 (mono_domain_get (), uniname, size);
319 result = mono_string_new (mono_domain_get (), "");
329 ves_icall_System_Security_Principal_WindowsIdentity_GetUserToken (MonoString *username)
332 gpointer token = NULL;
334 /* TODO: MS has something like this working in Windows 2003 (client and
335 * server) but works only for domain accounts (so it's quite limiting).
336 * http://www.develop.com/kbrown/book/html/howto_logonuser.html
338 g_warning ("Unsupported on Win32 (anyway requires W2K3 minimum)");
340 #else /* HOST_WIN32*/
342 #ifdef HAVE_GETPWNAM_R
348 gpointer token = (gpointer) -2;
353 utf8_name = mono_unicode_to_external (mono_string_chars (username));
355 #ifdef HAVE_GETPWNAM_R
356 #ifdef _SC_GETPW_R_SIZE_MAX
357 fbufsize = mono_sysconf (_SC_GETPW_R_SIZE_MAX);
359 fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
362 fbuf = g_malloc0 (fbufsize);
363 retval = getpwnam_r (utf8_name, &pwd, fbuf, fbufsize, &p);
364 result = ((retval == 0) && (p == &pwd));
366 /* default to non thread-safe but posix compliant function */
367 p = getpwnam (utf8_name);
368 result = (p != NULL);
372 token = GINT_TO_POINTER (p->pw_uid);
375 #ifdef HAVE_GETPWNAM_R
384 /* http://www.dotnet247.com/247reference/msgs/39/195403.aspx
385 // internal static string[] WindowsIdentity._GetRoles (IntPtr token)
388 ves_icall_System_Security_Principal_WindowsIdentity_GetRoles (gpointer token)
390 MonoArray *array = NULL;
391 MonoDomain *domain = mono_domain_get ();
395 GetTokenInformation (token, TokenGroups, NULL, size, (PDWORD)&size);
397 TOKEN_GROUPS *tg = g_malloc0 (size);
398 if (GetTokenInformation (token, TokenGroups, tg, size, (PDWORD)&size)) {
400 int num = tg->GroupCount;
402 array = mono_array_new (domain, mono_get_string_class (), num);
404 for (i=0; i < num; i++) {
406 gunichar2 *uniname = GetSidName (NULL, tg->Groups [i].Sid, &size);
409 MonoString *str = mono_string_new_utf16 (domain, uniname, size);
410 mono_array_setref (array, i, str);
418 /* POSIX-compliant systems should use IsMemberOfGroupId or IsMemberOfGroupName */
419 g_warning ("WindowsIdentity._GetRoles should never be called on POSIX");
422 /* return empty array of string, i.e. string [0] */
423 array = mono_array_new (domain, mono_get_string_class (), 0);
429 /* System.Security.Principal.WindowsImpersonationContext */
433 ves_icall_System_Security_Principal_WindowsImpersonationContext_CloseToken (gpointer token)
435 gboolean result = TRUE;
438 result = (CloseHandle (token) != 0);
445 ves_icall_System_Security_Principal_WindowsImpersonationContext_DuplicateToken (gpointer token)
447 gpointer dupe = NULL;
450 if (DuplicateToken (token, SecurityImpersonation, &dupe) == 0) {
461 ves_icall_System_Security_Principal_WindowsImpersonationContext_SetCurrentToken (gpointer token)
463 /* Posix version implemented in /mono/mono/io-layer/security.c */
464 return (ImpersonateLoggedOnUser (token) != 0);
469 ves_icall_System_Security_Principal_WindowsImpersonationContext_RevertToSelf (void)
471 /* Posix version implemented in /mono/mono/io-layer/security.c */
472 return (RevertToSelf () != 0);
476 /* System.Security.Principal.WindowsPrincipal */
479 ves_icall_System_Security_Principal_WindowsPrincipal_IsMemberOfGroupId (gpointer user, gpointer group)
481 gboolean result = FALSE;
484 /* The convertion from an ID to a string is done in managed code for Windows */
485 g_warning ("IsMemberOfGroupId should never be called on Win32");
487 #else /* HOST_WIN32 */
489 #ifdef HAVE_GETGRGID_R
495 struct group *g = NULL;
497 #ifdef HAVE_GETGRGID_R
498 #ifdef _SC_GETGR_R_SIZE_MAX
499 fbufsize = mono_sysconf (_SC_GETGR_R_SIZE_MAX);
501 fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
503 fbuf = g_malloc0 (fbufsize);
504 retval = getgrgid_r ((gid_t) GPOINTER_TO_INT (group), &grp, fbuf, fbufsize, &g);
505 result = ((retval == 0) && (g == &grp));
507 /* default to non thread-safe but posix compliant function */
508 g = getgrgid ((gid_t) GPOINTER_TO_INT (group));
509 result = (g != NULL);
513 result = IsMemberOf ((uid_t) GPOINTER_TO_INT (user), g);
516 #ifdef HAVE_GETGRGID_R
520 #endif /* HOST_WIN32 */
527 ves_icall_System_Security_Principal_WindowsPrincipal_IsMemberOfGroupName (gpointer user, MonoString *group)
529 gboolean result = FALSE;
532 /* Windows version use a cache built using WindowsIdentity._GetRoles */
533 g_warning ("IsMemberOfGroupName should never be called on Win32");
535 #else /* HOST_WIN32 */
536 gchar *utf8_groupname;
538 utf8_groupname = mono_unicode_to_external (mono_string_chars (group));
539 if (utf8_groupname) {
540 struct group *g = NULL;
541 #ifdef HAVE_GETGRNAM_R
545 #ifdef _SC_GETGR_R_SIZE_MAX
546 size_t fbufsize = mono_sysconf (_SC_GETGR_R_SIZE_MAX);
548 size_t fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
550 fbuf = g_malloc0 (fbufsize);
551 retval = getgrnam_r (utf8_groupname, &grp, fbuf, fbufsize, &g);
552 result = ((retval == 0) && (g == &grp));
554 /* default to non thread-safe but posix compliant function */
555 g = getgrnam (utf8_groupname);
556 result = (g != NULL);
560 result = IsMemberOf ((uid_t) GPOINTER_TO_INT (user), g);
563 #ifdef HAVE_GETGRNAM_R
566 g_free (utf8_groupname);
568 #endif /* HOST_WIN32 */
574 /* Mono.Security.Cryptography IO related internal calls */
579 GetAdministratorsSid (void)
581 SID_IDENTIFIER_AUTHORITY admins = SECURITY_NT_AUTHORITY;
583 if (!AllocateAndInitializeSid (&admins, 2, SECURITY_BUILTIN_DOMAIN_RID,
584 DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &pSid))
586 /* Note: this SID must be freed with FreeSid () */
592 GetEveryoneSid (void)
594 SID_IDENTIFIER_AUTHORITY everyone = SECURITY_WORLD_SID_AUTHORITY;
596 if (!AllocateAndInitializeSid (&everyone, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &pSid))
598 /* Note: this SID must be freed with FreeSid () */
604 GetCurrentUserSid (void)
608 gpointer token = ves_icall_System_Security_Principal_WindowsIdentity_GetCurrentToken ();
610 GetTokenInformation (token, TokenUser, NULL, size, (PDWORD)&size);
612 TOKEN_USER *tu = g_malloc0 (size);
613 if (GetTokenInformation (token, TokenUser, tu, size, (PDWORD)&size)) {
614 DWORD length = GetLengthSid (tu->User.Sid);
615 sid = (PSID) g_malloc0 (length);
616 if (!CopySid (length, sid, tu->User.Sid)) {
623 /* Note: this SID must be freed with g_free () */
629 GetRightsFromSid (PSID sid, PACL acl)
631 ACCESS_MASK rights = 0;
634 BuildTrusteeWithSidW (&trustee, sid);
635 if (GetEffectiveRightsFromAcl (acl, &trustee, &rights) != ERROR_SUCCESS)
643 IsMachineProtected (gunichar2 *path)
645 gboolean success = FALSE;
647 PSID pEveryoneSid = NULL;
649 DWORD dwRes = GetNamedSecurityInfoW (path, SE_FILE_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, &pDACL, NULL, NULL);
650 if (dwRes != ERROR_SUCCESS)
653 /* We check that Everyone is still limited to READ-ONLY -
654 but not if new entries have been added by an Administrator */
656 pEveryoneSid = GetEveryoneSid ();
658 ACCESS_MASK rights = GetRightsFromSid (pEveryoneSid, pDACL);
659 /* http://msdn.microsoft.com/library/en-us/security/security/generic_access_rights.asp?frame=true */
660 success = (rights == (READ_CONTROL | SYNCHRONIZE | FILE_READ_DATA | FILE_READ_EA | FILE_READ_ATTRIBUTES));
661 FreeSid (pEveryoneSid);
663 /* Note: we don't need to check our own access -
664 we'll know soon enough when reading the file */
674 IsUserProtected (gunichar2 *path)
676 gboolean success = FALSE;
678 PSID pEveryoneSid = NULL;
679 PSECURITY_DESCRIPTOR pSecurityDescriptor = NULL;
681 DWORD dwRes = GetNamedSecurityInfoW (path, SE_FILE_OBJECT,
682 DACL_SECURITY_INFORMATION, NULL, NULL, &pDACL, NULL, &pSecurityDescriptor);
683 if (dwRes != ERROR_SUCCESS)
686 /* We check that our original entries in the ACL are in place -
687 but not if new entries have been added by the user */
689 /* Everyone should be denied */
690 pEveryoneSid = GetEveryoneSid ();
692 ACCESS_MASK rights = GetRightsFromSid (pEveryoneSid, pDACL);
693 success = (rights == 0);
694 FreeSid (pEveryoneSid);
696 /* Note: we don't need to check our own access -
697 we'll know soon enough when reading the file */
699 if (pSecurityDescriptor)
700 LocalFree (pSecurityDescriptor);
707 ProtectMachine (gunichar2 *path)
709 PSID pEveryoneSid = GetEveryoneSid ();
710 PSID pAdminsSid = GetAdministratorsSid ();
713 if (pEveryoneSid && pAdminsSid) {
715 EXPLICIT_ACCESS ea [2];
716 ZeroMemory (&ea, 2 * sizeof (EXPLICIT_ACCESS));
718 /* grant all access to the BUILTIN\Administrators group */
719 BuildTrusteeWithSidW (&ea [0].Trustee, pAdminsSid);
720 ea [0].grfAccessPermissions = GENERIC_ALL;
721 ea [0].grfAccessMode = SET_ACCESS;
722 ea [0].grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
723 ea [0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
724 ea [0].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
726 /* read-only access everyone */
727 BuildTrusteeWithSidW (&ea [1].Trustee, pEveryoneSid);
728 ea [1].grfAccessPermissions = GENERIC_READ;
729 ea [1].grfAccessMode = SET_ACCESS;
730 ea [1].grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
731 ea [1].Trustee.TrusteeForm = TRUSTEE_IS_SID;
732 ea [1].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
734 retval = SetEntriesInAcl (2, ea, NULL, &pDACL);
735 if (retval == ERROR_SUCCESS) {
736 /* with PROTECTED_DACL_SECURITY_INFORMATION we */
737 /* remove any existing ACL (like inherited ones) */
738 retval = SetNamedSecurityInfo (path, SE_FILE_OBJECT,
739 DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION,
740 NULL, NULL, pDACL, NULL);
747 FreeSid (pEveryoneSid);
749 FreeSid (pAdminsSid);
750 return (retval == ERROR_SUCCESS);
755 ProtectUser (gunichar2 *path)
759 PSID pCurrentSid = GetCurrentUserSid ();
763 ZeroMemory (&ea, sizeof (EXPLICIT_ACCESS));
765 /* grant exclusive access to the current user */
766 BuildTrusteeWithSidW (&ea.Trustee, pCurrentSid);
767 ea.grfAccessPermissions = GENERIC_ALL;
768 ea.grfAccessMode = SET_ACCESS;
769 ea.grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
770 ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
771 ea.Trustee.TrusteeType = TRUSTEE_IS_USER;
773 retval = SetEntriesInAcl (1, &ea, NULL, &pDACL);
774 if (retval == ERROR_SUCCESS) {
775 /* with PROTECTED_DACL_SECURITY_INFORMATION we
776 remove any existing ACL (like inherited ones) */
777 retval = SetNamedSecurityInfo (path, SE_FILE_OBJECT,
778 DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION,
779 NULL, NULL, pDACL, NULL);
784 g_free (pCurrentSid); /* g_malloc0 */
787 return (retval == ERROR_SUCCESS);
793 IsProtected (MonoString *path, gint32 protection)
795 gboolean result = FALSE;
796 gchar *utf8_name = mono_unicode_to_external (mono_string_chars (path));
799 if (stat (utf8_name, &st) == 0) {
800 result = (((st.st_mode & 0777) & protection) == 0);
809 Protect (MonoString *path, gint32 file_mode, gint32 add_dir_mode)
811 gboolean result = FALSE;
812 gchar *utf8_name = mono_unicode_to_external (mono_string_chars (path));
815 if (stat (utf8_name, &st) == 0) {
816 int mode = file_mode;
817 if (st.st_mode & S_IFDIR)
818 mode |= add_dir_mode;
819 result = (chmod (utf8_name, mode) == 0);
826 #endif /* not HOST_WIN32 */
830 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_CanSecure (MonoString *root)
835 /* ACL are nice... unless you have FAT or other uncivilized filesystem */
836 if (!GetVolumeInformation (mono_string_chars (root), NULL, 0, NULL, NULL, (LPDWORD)&flags, NULL, 0))
838 return ((flags & FS_PERSISTENT_ACLS) == FS_PERSISTENT_ACLS);
840 /* we assume some kind of security is applicable outside Windows */
847 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_IsMachineProtected (MonoString *path)
849 gboolean ret = FALSE;
851 /* no one, but the owner, should have write access to the directory */
853 ret = IsMachineProtected (mono_string_chars (path));
855 ret = IsProtected (path, (S_IWGRP | S_IWOTH));
862 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_IsUserProtected (MonoString *path)
864 gboolean ret = FALSE;
866 /* no one, but the user, should have access to the directory */
868 ret = IsUserProtected (mono_string_chars (path));
870 ret = IsProtected (path, (S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH));
877 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_ProtectMachine (MonoString *path)
879 gboolean ret = FALSE;
881 /* read/write to owner, read to everyone else */
883 ret = ProtectMachine (mono_string_chars (path));
885 ret = Protect (path, (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH), (S_IXUSR | S_IXGRP | S_IXOTH));
892 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_ProtectUser (MonoString *path)
894 gboolean ret = FALSE;
896 /* read/write to user, no access to everyone else */
898 ret = ProtectUser (mono_string_chars (path));
900 ret = Protect (path, (S_IRUSR | S_IWUSR), S_IXUSR);
907 * Returns TRUE if there is "something" where the Authenticode signature is
908 * normally located. Returns FALSE is data directory is empty.
910 * Note: Neither the structure nor the signature is verified by this function.
913 ves_icall_System_Security_Policy_Evidence_IsAuthenticodePresent (MonoReflectionAssembly *refass)
915 if (refass && refass->assembly && refass->assembly->image) {
916 return mono_image_has_authenticode_entry (refass->assembly->image);
922 /* System.Security.SecureString related internal calls */
924 static MonoImage *system_security_assembly = NULL;
927 ves_icall_System_Security_SecureString_DecryptInternal (MonoArray *data, MonoObject *scope)
929 invoke_protected_memory_method (data, scope, FALSE);
932 ves_icall_System_Security_SecureString_EncryptInternal (MonoArray* data, MonoObject *scope)
934 invoke_protected_memory_method (data, scope, TRUE);
937 void invoke_protected_memory_method (MonoArray *data, MonoObject *scope, gboolean encrypt)
943 if (system_security_assembly == NULL) {
944 system_security_assembly = mono_image_loaded ("System.Security");
945 if (!system_security_assembly) {
946 MonoAssembly *sa = mono_assembly_open ("System.Security.dll", NULL);
948 g_assert_not_reached ();
949 system_security_assembly = mono_assembly_get_image (sa);
953 klass = mono_class_from_name (system_security_assembly,
954 "System.Security.Cryptography", "ProtectedMemory");
955 method = mono_class_get_method_from_name (klass, encrypt ? "Protect" : "Unprotect", 2);
957 params [1] = scope; /* MemoryProtectionScope.SameProcess */
958 mono_runtime_invoke (method, NULL, params, NULL);