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_raise_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 ();
398 GetTokenInformation (token, TokenGroups, NULL, size, (PDWORD)&size);
400 TOKEN_GROUPS *tg = g_malloc0 (size);
401 if (GetTokenInformation (token, TokenGroups, tg, size, (PDWORD)&size)) {
403 int num = tg->GroupCount;
405 array = mono_array_new (domain, mono_get_string_class (), num);
407 for (i=0; i < num; i++) {
409 gunichar2 *uniname = GetSidName (NULL, tg->Groups [i].Sid, &size);
413 MonoString *str = mono_string_new_utf16_checked (domain, uniname, size, &error);
414 mono_error_raise_exception (&error);
415 mono_array_setref (array, i, str);
423 /* POSIX-compliant systems should use IsMemberOfGroupId or IsMemberOfGroupName */
424 g_warning ("WindowsIdentity._GetRoles should never be called on POSIX");
427 /* return empty array of string, i.e. string [0] */
428 array = mono_array_new (domain, mono_get_string_class (), 0);
434 /* System.Security.Principal.WindowsImpersonationContext */
438 ves_icall_System_Security_Principal_WindowsImpersonationContext_CloseToken (gpointer token)
440 gboolean result = TRUE;
443 result = (CloseHandle (token) != 0);
450 ves_icall_System_Security_Principal_WindowsImpersonationContext_DuplicateToken (gpointer token)
452 gpointer dupe = NULL;
455 if (DuplicateToken (token, SecurityImpersonation, &dupe) == 0) {
466 ves_icall_System_Security_Principal_WindowsImpersonationContext_SetCurrentToken (gpointer token)
468 /* Posix version implemented in /mono/mono/io-layer/security.c */
469 return (ImpersonateLoggedOnUser (token) != 0);
474 ves_icall_System_Security_Principal_WindowsImpersonationContext_RevertToSelf (void)
476 /* Posix version implemented in /mono/mono/io-layer/security.c */
477 return (RevertToSelf () != 0);
481 /* System.Security.Principal.WindowsPrincipal */
484 ves_icall_System_Security_Principal_WindowsPrincipal_IsMemberOfGroupId (gpointer user, gpointer group)
486 gboolean result = FALSE;
489 /* The convertion from an ID to a string is done in managed code for Windows */
490 g_warning ("IsMemberOfGroupId should never be called on Win32");
492 #else /* HOST_WIN32 */
494 #ifdef HAVE_GETGRGID_R
500 struct group *g = NULL;
502 #ifdef HAVE_GETGRGID_R
503 #ifdef _SC_GETGR_R_SIZE_MAX
504 fbufsize = mono_sysconf (_SC_GETGR_R_SIZE_MAX);
506 fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
508 fbuf = (gchar *)g_malloc0 (fbufsize);
509 retval = getgrgid_r ((gid_t) GPOINTER_TO_INT (group), &grp, fbuf, fbufsize, &g);
510 result = ((retval == 0) && (g == &grp));
512 /* default to non thread-safe but posix compliant function */
513 g = getgrgid ((gid_t) GPOINTER_TO_INT (group));
514 result = (g != NULL);
518 result = IsMemberOf ((uid_t) GPOINTER_TO_INT (user), g);
521 #ifdef HAVE_GETGRGID_R
525 #endif /* HOST_WIN32 */
532 ves_icall_System_Security_Principal_WindowsPrincipal_IsMemberOfGroupName (gpointer user, MonoString *group)
534 gboolean result = FALSE;
537 /* Windows version use a cache built using WindowsIdentity._GetRoles */
538 g_warning ("IsMemberOfGroupName should never be called on Win32");
540 #else /* HOST_WIN32 */
541 gchar *utf8_groupname;
543 utf8_groupname = mono_unicode_to_external (mono_string_chars (group));
544 if (utf8_groupname) {
545 struct group *g = NULL;
546 #ifdef HAVE_GETGRNAM_R
550 #ifdef _SC_GETGR_R_SIZE_MAX
551 size_t fbufsize = mono_sysconf (_SC_GETGR_R_SIZE_MAX);
553 size_t fbufsize = MONO_SYSCONF_DEFAULT_SIZE;
555 fbuf = (gchar *)g_malloc0 (fbufsize);
556 retval = getgrnam_r (utf8_groupname, &grp, fbuf, fbufsize, &g);
557 result = ((retval == 0) && (g == &grp));
559 /* default to non thread-safe but posix compliant function */
560 g = getgrnam (utf8_groupname);
561 result = (g != NULL);
565 result = IsMemberOf ((uid_t) GPOINTER_TO_INT (user), g);
568 #ifdef HAVE_GETGRNAM_R
571 g_free (utf8_groupname);
573 #endif /* HOST_WIN32 */
579 /* Mono.Security.Cryptography IO related internal calls */
584 GetAdministratorsSid (void)
586 SID_IDENTIFIER_AUTHORITY admins = SECURITY_NT_AUTHORITY;
588 if (!AllocateAndInitializeSid (&admins, 2, SECURITY_BUILTIN_DOMAIN_RID,
589 DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &pSid))
591 /* Note: this SID must be freed with FreeSid () */
597 GetEveryoneSid (void)
599 SID_IDENTIFIER_AUTHORITY everyone = SECURITY_WORLD_SID_AUTHORITY;
601 if (!AllocateAndInitializeSid (&everyone, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &pSid))
603 /* Note: this SID must be freed with FreeSid () */
609 GetCurrentUserSid (void)
613 gpointer token = ves_icall_System_Security_Principal_WindowsIdentity_GetCurrentToken ();
615 GetTokenInformation (token, TokenUser, NULL, size, (PDWORD)&size);
617 TOKEN_USER *tu = g_malloc0 (size);
618 if (GetTokenInformation (token, TokenUser, tu, size, (PDWORD)&size)) {
619 DWORD length = GetLengthSid (tu->User.Sid);
620 sid = (PSID) g_malloc0 (length);
621 if (!CopySid (length, sid, tu->User.Sid)) {
628 /* Note: this SID must be freed with g_free () */
634 GetRightsFromSid (PSID sid, PACL acl)
636 ACCESS_MASK rights = 0;
639 BuildTrusteeWithSidW (&trustee, sid);
640 if (GetEffectiveRightsFromAcl (acl, &trustee, &rights) != ERROR_SUCCESS)
648 IsMachineProtected (gunichar2 *path)
650 gboolean success = FALSE;
652 PSID pEveryoneSid = NULL;
654 DWORD dwRes = GetNamedSecurityInfoW (path, SE_FILE_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, &pDACL, NULL, NULL);
655 if (dwRes != ERROR_SUCCESS)
658 /* We check that Everyone is still limited to READ-ONLY -
659 but not if new entries have been added by an Administrator */
661 pEveryoneSid = GetEveryoneSid ();
663 ACCESS_MASK rights = GetRightsFromSid (pEveryoneSid, pDACL);
664 /* http://msdn.microsoft.com/library/en-us/security/security/generic_access_rights.asp?frame=true */
665 success = (rights == (READ_CONTROL | SYNCHRONIZE | FILE_READ_DATA | FILE_READ_EA | FILE_READ_ATTRIBUTES));
666 FreeSid (pEveryoneSid);
668 /* Note: we don't need to check our own access -
669 we'll know soon enough when reading the file */
679 IsUserProtected (gunichar2 *path)
681 gboolean success = FALSE;
683 PSID pEveryoneSid = NULL;
684 PSECURITY_DESCRIPTOR pSecurityDescriptor = NULL;
686 DWORD dwRes = GetNamedSecurityInfoW (path, SE_FILE_OBJECT,
687 DACL_SECURITY_INFORMATION, NULL, NULL, &pDACL, NULL, &pSecurityDescriptor);
688 if (dwRes != ERROR_SUCCESS)
691 /* We check that our original entries in the ACL are in place -
692 but not if new entries have been added by the user */
694 /* Everyone should be denied */
695 pEveryoneSid = GetEveryoneSid ();
697 ACCESS_MASK rights = GetRightsFromSid (pEveryoneSid, pDACL);
698 success = (rights == 0);
699 FreeSid (pEveryoneSid);
701 /* Note: we don't need to check our own access -
702 we'll know soon enough when reading the file */
704 if (pSecurityDescriptor)
705 LocalFree (pSecurityDescriptor);
712 ProtectMachine (gunichar2 *path)
714 PSID pEveryoneSid = GetEveryoneSid ();
715 PSID pAdminsSid = GetAdministratorsSid ();
718 if (pEveryoneSid && pAdminsSid) {
720 EXPLICIT_ACCESS ea [2];
721 ZeroMemory (&ea, 2 * sizeof (EXPLICIT_ACCESS));
723 /* grant all access to the BUILTIN\Administrators group */
724 BuildTrusteeWithSidW (&ea [0].Trustee, pAdminsSid);
725 ea [0].grfAccessPermissions = GENERIC_ALL;
726 ea [0].grfAccessMode = SET_ACCESS;
727 ea [0].grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
728 ea [0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
729 ea [0].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
731 /* read-only access everyone */
732 BuildTrusteeWithSidW (&ea [1].Trustee, pEveryoneSid);
733 ea [1].grfAccessPermissions = GENERIC_READ;
734 ea [1].grfAccessMode = SET_ACCESS;
735 ea [1].grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
736 ea [1].Trustee.TrusteeForm = TRUSTEE_IS_SID;
737 ea [1].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
739 retval = SetEntriesInAcl (2, ea, NULL, &pDACL);
740 if (retval == ERROR_SUCCESS) {
741 /* with PROTECTED_DACL_SECURITY_INFORMATION we */
742 /* remove any existing ACL (like inherited ones) */
743 retval = SetNamedSecurityInfo (path, SE_FILE_OBJECT,
744 DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION,
745 NULL, NULL, pDACL, NULL);
752 FreeSid (pEveryoneSid);
754 FreeSid (pAdminsSid);
755 return (retval == ERROR_SUCCESS);
760 ProtectUser (gunichar2 *path)
764 PSID pCurrentSid = GetCurrentUserSid ();
768 ZeroMemory (&ea, sizeof (EXPLICIT_ACCESS));
770 /* grant exclusive access to the current user */
771 BuildTrusteeWithSidW (&ea.Trustee, pCurrentSid);
772 ea.grfAccessPermissions = GENERIC_ALL;
773 ea.grfAccessMode = SET_ACCESS;
774 ea.grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
775 ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
776 ea.Trustee.TrusteeType = TRUSTEE_IS_USER;
778 retval = SetEntriesInAcl (1, &ea, NULL, &pDACL);
779 if (retval == ERROR_SUCCESS) {
780 /* with PROTECTED_DACL_SECURITY_INFORMATION we
781 remove any existing ACL (like inherited ones) */
782 retval = SetNamedSecurityInfo (path, SE_FILE_OBJECT,
783 DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION,
784 NULL, NULL, pDACL, NULL);
789 g_free (pCurrentSid); /* g_malloc0 */
792 return (retval == ERROR_SUCCESS);
798 IsProtected (MonoString *path, gint32 protection)
800 gboolean result = FALSE;
801 gchar *utf8_name = mono_unicode_to_external (mono_string_chars (path));
804 if (stat (utf8_name, &st) == 0) {
805 result = (((st.st_mode & 0777) & protection) == 0);
814 Protect (MonoString *path, gint32 file_mode, gint32 add_dir_mode)
816 gboolean result = FALSE;
817 gchar *utf8_name = mono_unicode_to_external (mono_string_chars (path));
820 if (stat (utf8_name, &st) == 0) {
821 int mode = file_mode;
822 if (st.st_mode & S_IFDIR)
823 mode |= add_dir_mode;
824 result = (chmod (utf8_name, mode) == 0);
831 #endif /* not HOST_WIN32 */
835 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_CanSecure (MonoString *root)
840 /* ACL are nice... unless you have FAT or other uncivilized filesystem */
841 if (!GetVolumeInformation (mono_string_chars (root), NULL, 0, NULL, NULL, (LPDWORD)&flags, NULL, 0))
843 return ((flags & FS_PERSISTENT_ACLS) == FS_PERSISTENT_ACLS);
845 /* we assume some kind of security is applicable outside Windows */
852 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_IsMachineProtected (MonoString *path)
854 gboolean ret = FALSE;
856 /* no one, but the owner, should have write access to the directory */
858 ret = IsMachineProtected (mono_string_chars (path));
860 ret = IsProtected (path, (S_IWGRP | S_IWOTH));
867 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_IsUserProtected (MonoString *path)
869 gboolean ret = FALSE;
871 /* no one, but the user, should have access to the directory */
873 ret = IsUserProtected (mono_string_chars (path));
875 ret = IsProtected (path, (S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH));
882 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_ProtectMachine (MonoString *path)
884 gboolean ret = FALSE;
886 /* read/write to owner, read to everyone else */
888 ret = ProtectMachine (mono_string_chars (path));
890 ret = Protect (path, (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH), (S_IXUSR | S_IXGRP | S_IXOTH));
897 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_ProtectUser (MonoString *path)
899 gboolean ret = FALSE;
901 /* read/write to user, no access to everyone else */
903 ret = ProtectUser (mono_string_chars (path));
905 ret = Protect (path, (S_IRUSR | S_IWUSR), S_IXUSR);
912 * Returns TRUE if there is "something" where the Authenticode signature is
913 * normally located. Returns FALSE is data directory is empty.
915 * Note: Neither the structure nor the signature is verified by this function.
918 ves_icall_System_Security_Policy_Evidence_IsAuthenticodePresent (MonoReflectionAssembly *refass)
920 if (refass && refass->assembly && refass->assembly->image) {
921 return mono_image_has_authenticode_entry (refass->assembly->image);
927 /* System.Security.SecureString related internal calls */
929 static MonoImage *system_security_assembly = NULL;
932 ves_icall_System_Security_SecureString_DecryptInternal (MonoArray *data, MonoObject *scope)
934 invoke_protected_memory_method (data, scope, FALSE);
937 ves_icall_System_Security_SecureString_EncryptInternal (MonoArray* data, MonoObject *scope)
939 invoke_protected_memory_method (data, scope, TRUE);
942 void invoke_protected_memory_method (MonoArray *data, MonoObject *scope, gboolean encrypt)
949 if (system_security_assembly == NULL) {
950 system_security_assembly = mono_image_loaded ("System.Security");
951 if (!system_security_assembly) {
952 MonoAssembly *sa = mono_assembly_open ("System.Security.dll", NULL);
954 g_assert_not_reached ();
955 system_security_assembly = mono_assembly_get_image (sa);
959 klass = mono_class_load_from_name (system_security_assembly,
960 "System.Security.Cryptography", "ProtectedMemory");
961 method = mono_class_get_method_from_name (klass, encrypt ? "Protect" : "Unprotect", 2);
963 params [1] = scope; /* MemoryProtectionScope.SameProcess */
965 mono_runtime_invoke_checked (method, NULL, params, &error);
966 mono_error_raise_exception (&error); /* FIXME don't raise here */