2 * security.c: Security internal calls
5 * Sebastien Pouliot <sebastien@ximian.com>
7 * (C) 2004 Novell (http://www.novell.com)
14 #include <mono/metadata/appdomain.h>
15 #include <mono/metadata/image.h>
16 #include <mono/metadata/exception.h>
17 #include <mono/metadata/object-internals.h>
18 #include <mono/metadata/metadata-internals.h>
19 #include <mono/metadata/security.h>
20 #include <mono/io-layer/io-layer.h>
21 #include <mono/utils/strenc.h>
28 #ifndef PROTECTED_DACL_SECURITY_INFORMATION
29 #define PROTECTED_DACL_SECURITY_INFORMATION 0x80000000L
39 #include <sys/types.h>
46 #ifndef HAVE_GETGRGID_R
47 #warning Non-thread safe getgrgid being used!
49 #ifndef HAVE_GETGRNAM_R
50 #warning Non-thread safe getgrnam being used!
52 #ifndef HAVE_GETPWNAM_R
53 #warning Non-thread safe getpwnam being used!
55 #ifndef HAVE_GETPWUID_R
56 #warning Non-thread safe getpwuid being used!
59 #endif /* defined(__GNUC__) */
61 #endif /* not PLATFORM_WIN32 */
64 /* internal functions - reuse driven */
68 /* ask a server to translate a SID into a textual representation */
70 GetSidName (gunichar2 *server, PSID sid, gint32 *size)
72 gunichar2 *uniname = NULL;
75 SID_NAME_USE peUse; /* out */
77 LookupAccountSid (server, sid, NULL, &cchName, NULL,
80 if ((cchName > 0) && (cchDomain > 0)) {
81 gunichar2 *user = g_malloc0 ((cchName + 1) * 2);
82 gunichar2 *domain = g_malloc0 ((cchDomain + 1) * 2);
84 LookupAccountSid (server, sid, user, &cchName, domain,
89 /* domain/machine name included (+ sepearator) */
90 *size = cchName + cchDomain + 1;
91 uniname = g_malloc0 ((*size + 1) * 2);
92 memcpy (uniname, domain, cchDomain * 2);
93 *(uniname + cchDomain) = '\\';
94 memcpy (uniname + cchDomain + 1, user, cchName * 2);
98 /* no domain / machine */
104 /* nothing -> return NULL */
115 #else /* not PLATFORM_WIN32 */
119 GetTokenName (uid_t uid)
123 #ifdef HAVE_GETPWUID_R
129 struct passwd *p = NULL;
132 #ifdef HAVE_GETPWUID_R
133 #ifdef _SC_GETPW_R_SIZE_MAX
134 fbufsize = (size_t) sysconf (_SC_GETPW_R_SIZE_MAX);
136 fbufsize = (size_t) 1024;
138 fbuf = g_malloc0 (fbufsize);
139 retval = getpwuid_r (uid, &pwd, fbuf, fbufsize, &p);
140 result = ((retval == 0) && (p == &pwd));
142 /* default to non thread-safe but posix compliant function */
144 result = (p != NULL);
148 uname = g_strdup (p->pw_name);
151 #ifdef HAVE_GETPWUID_R
160 IsMemberInList (uid_t user, struct group *g)
162 gboolean result = FALSE;
163 gchar *utf8_username = GetTokenName (user);
169 gchar **users = g->gr_mem;
173 if (strcmp (utf8_username, u) == 0) {
181 g_free (utf8_username);
187 IsDefaultGroup (uid_t user, gid_t group)
189 #ifdef HAVE_GETPWUID_R
195 struct passwd *p = NULL;
198 #ifdef HAVE_GETPWUID_R
199 #ifdef _SC_GETPW_R_SIZE_MAX
200 fbufsize = (size_t) sysconf (_SC_GETPW_R_SIZE_MAX);
202 fbufsize = (size_t) 1024;
205 fbuf = g_malloc0 (fbufsize);
206 retval = getpwuid_r (user, &pwd, fbuf, fbufsize, &p);
207 result = ((retval == 0) && (p == &pwd));
209 /* default to non thread-safe but posix compliant function */
211 result = (p != NULL);
215 result = (p->pw_gid == group);
218 #ifdef HAVE_GETPWUID_R
227 IsMemberOf (gid_t user, struct group *g)
232 /* is it the user default group */
233 if (IsDefaultGroup (user, g->gr_gid))
236 /* is the user in the group list */
237 return IsMemberInList (user, g);
246 /* System.Environment */
250 ves_icall_System_Environment_get_UserName (void)
254 /* using glib is more portable */
255 return mono_string_new (mono_domain_get (), g_get_user_name ());
259 /* System.Security.Principal.WindowsIdentity */
263 ves_icall_System_Security_Principal_WindowsIdentity_GetCurrentToken (void)
265 gpointer token = NULL;
269 #ifdef PLATFORM_WIN32
270 /* Note: This isn't a copy of the Token - we must not close it!!!
271 * http://www.develop.com/kbrown/book/html/whatis_windowsprincipal.html
274 /* thread may be impersonating somebody */
275 if (OpenThreadToken (GetCurrentThread (), TOKEN_QUERY, 1, &token) == 0) {
276 /* if not take the process identity */
277 OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &token);
280 token = (gpointer) geteuid ();
287 ves_icall_System_Security_Principal_WindowsIdentity_GetTokenName (gpointer token)
289 MonoString *result = NULL;
290 gunichar2 *uniname = NULL;
293 #ifdef PLATFORM_WIN32
296 GetTokenInformation (token, TokenUser, NULL, size, (PDWORD)&size);
298 TOKEN_USER *tu = g_malloc0 (size);
299 if (GetTokenInformation (token, TokenUser, tu, size, (PDWORD)&size)) {
300 uniname = GetSidName (NULL, tu->User.Sid, &size);
305 gchar *uname = GetTokenName ((uid_t) token);
310 size = strlen (uname);
311 uniname = g_utf8_to_utf16 (uname, size, NULL, NULL, NULL);
314 #endif /* PLATFORM_WIN32 */
317 result = mono_string_new_utf16 (mono_domain_get (), uniname, size);
320 result = mono_string_new (mono_domain_get (), "");
330 ves_icall_System_Security_Principal_WindowsIdentity_GetUserToken (MonoString *username)
332 #ifdef PLATFORM_WIN32
333 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 /* PLATFORM_WIN32*/
345 #ifdef HAVE_GETPWNAM_R
351 gpointer token = (gpointer) -2;
358 utf8_name = mono_unicode_to_external (mono_string_chars (username));
360 #ifdef HAVE_GETPWNAM_R
361 #ifdef _SC_GETPW_R_SIZE_MAX
362 fbufsize = (size_t) sysconf (_SC_GETPW_R_SIZE_MAX);
364 fbufsize = (size_t) 1024;
367 fbuf = g_malloc0 (fbufsize);
368 retval = getpwnam_r (utf8_name, &pwd, fbuf, fbufsize, &p);
369 result = ((retval == 0) && (p == &pwd));
371 /* default to non thread-safe but posix compliant function */
372 p = getpwnam (utf8_name);
373 result = (p != NULL);
377 token = (gpointer) p->pw_uid;
380 #ifdef HAVE_GETPWNAM_R
389 /* http://www.dotnet247.com/247reference/msgs/39/195403.aspx
390 // internal static string[] WindowsIdentity._GetRoles (IntPtr token)
393 ves_icall_System_Security_Principal_WindowsIdentity_GetRoles (gpointer token)
395 MonoArray *array = NULL;
396 MonoDomain *domain = mono_domain_get ();
397 #ifdef PLATFORM_WIN32
402 GetTokenInformation (token, TokenGroups, NULL, size, (PDWORD)&size);
404 TOKEN_GROUPS *tg = g_malloc0 (size);
405 if (GetTokenInformation (token, TokenGroups, tg, size, (PDWORD)&size)) {
407 int num = tg->GroupCount;
409 array = mono_array_new (domain, mono_get_string_class (), num);
411 for (i=0; i < num; i++) {
413 gunichar2 *uniname = GetSidName (NULL, tg->Groups [i].Sid, &size);
416 MonoString *str = mono_string_new_utf16 (domain, uniname, size);
417 mono_array_set (array, MonoString *, i, str);
425 /* POSIX-compliant systems should use IsMemberOfGroupId or IsMemberOfGroupName */
426 g_warning ("WindowsIdentity._GetRoles should never be called on POSIX");
429 /* return empty array of string, i.e. string [0] */
430 array = mono_array_new (domain, mono_get_string_class (), 0);
436 /* System.Security.Principal.WindowsImpersonationContext */
440 ves_icall_System_Security_Principal_WindowsImpersonationContext_CloseToken (gpointer token)
442 gboolean result = TRUE;
446 #ifdef PLATFORM_WIN32
447 result = (CloseHandle (token) != 0);
454 ves_icall_System_Security_Principal_WindowsImpersonationContext_DuplicateToken (gpointer token)
456 gpointer dupe = NULL;
460 #ifdef PLATFORM_WIN32
461 if (DuplicateToken (token, SecurityImpersonation, &dupe) == 0) {
472 ves_icall_System_Security_Principal_WindowsImpersonationContext_SetCurrentToken (gpointer token)
476 /* Posix version implemented in /mono/mono/io-layer/security.c */
477 return (ImpersonateLoggedOnUser (token) != 0);
482 ves_icall_System_Security_Principal_WindowsImpersonationContext_RevertToSelf (void)
486 /* Posix version implemented in /mono/mono/io-layer/security.c */
487 return (RevertToSelf () != 0);
491 /* System.Security.Principal.WindowsPrincipal */
494 ves_icall_System_Security_Principal_WindowsPrincipal_IsMemberOfGroupId (gpointer user, gpointer group)
496 gboolean result = FALSE;
498 #ifdef PLATFORM_WIN32
501 /* The convertion from an ID to a string is done in managed code for Windows */
502 g_warning ("IsMemberOfGroupId should never be called on Win32");
504 #else /* PLATFORM_WIN32 */
506 #ifdef HAVE_GETGRGID_R
512 struct group *g = NULL;
516 #ifdef HAVE_GETGRGID_R
517 #ifdef _SC_GETGR_R_SIZE_MAX
518 fbufsize = (size_t) sysconf (_SC_GETGR_R_SIZE_MAX);
520 fbufsize = (size_t) 1024;
522 fbuf = g_malloc0 (fbufsize);
523 retval = getgrgid_r ((gid_t) group, &grp, fbuf, fbufsize, &g);
524 result = ((retval == 0) && (g == &grp));
526 /* default to non thread-safe but posix compliant function */
527 g = getgrgid ((gid_t) group);
528 result = (g != NULL);
532 result = IsMemberOf ((uid_t) user, g);
535 #ifdef HAVE_GETGRGID_R
539 #endif /* PLATFORM_WIN32 */
546 ves_icall_System_Security_Principal_WindowsPrincipal_IsMemberOfGroupName (gpointer user, MonoString *group)
548 gboolean result = FALSE;
550 #ifdef PLATFORM_WIN32
554 /* Windows version use a cache built using WindowsIdentity._GetRoles */
555 g_warning ("IsMemberOfGroupName should never be called on Win32");
557 #else /* PLATFORM_WIN32 */
558 gchar *utf8_groupname;
562 utf8_groupname = mono_unicode_to_external (mono_string_chars (group));
563 if (utf8_groupname) {
564 struct group *g = NULL;
565 #ifdef HAVE_GETGRNAM_R
569 #ifdef _SC_GETGR_R_SIZE_MAX
570 size_t fbufsize = (size_t) sysconf (_SC_GETGR_R_SIZE_MAX);
572 size_t fbufsize = (size_t) 1024;
574 fbuf = g_malloc0 (fbufsize);
575 retval = getgrnam_r (utf8_groupname, &grp, fbuf, fbufsize, &g);
576 result = ((retval == 0) && (g == &grp));
578 /* default to non thread-safe but posix compliant function */
579 g = getgrnam (utf8_groupname);
580 result = (g != NULL);
584 result = IsMemberOf ((uid_t) user, g);
587 #ifdef HAVE_GETGRNAM_R
590 g_free (utf8_groupname);
592 #endif /* PLATFORM_WIN32 */
598 /* Mono.Security.Cryptography IO related internal calls */
600 #ifdef PLATFORM_WIN32
603 GetAdministratorsSid (void)
605 SID_IDENTIFIER_AUTHORITY admins = SECURITY_NT_AUTHORITY;
607 if (!AllocateAndInitializeSid (&admins, 2, SECURITY_BUILTIN_DOMAIN_RID,
608 DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &pSid))
610 /* Note: this SID must be freed with FreeSid () */
616 GetEveryoneSid (void)
618 SID_IDENTIFIER_AUTHORITY everyone = SECURITY_WORLD_SID_AUTHORITY;
620 if (!AllocateAndInitializeSid (&everyone, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &pSid))
622 /* Note: this SID must be freed with FreeSid () */
628 GetCurrentUserSid (void)
632 gpointer token = ves_icall_System_Security_Principal_WindowsIdentity_GetCurrentToken ();
634 GetTokenInformation (token, TokenUser, NULL, size, (PDWORD)&size);
636 TOKEN_USER *tu = g_malloc0 (size);
637 if (GetTokenInformation (token, TokenUser, tu, size, (PDWORD)&size)) {
638 DWORD length = GetLengthSid (tu->User.Sid);
639 sid = (PSID) g_malloc0 (length);
640 if (!CopySid (length, sid, tu->User.Sid)) {
647 /* Note: this SID must be freed with g_free () */
653 GetRightsFromSid (PSID sid, PACL acl)
655 ACCESS_MASK rights = 0;
658 BuildTrusteeWithSidW (&trustee, sid);
659 if (GetEffectiveRightsFromAcl (acl, &trustee, &rights) != ERROR_SUCCESS)
667 IsMachineProtected (gunichar2 *path)
669 gboolean success = FALSE;
671 PSID pEveryoneSid = NULL;
673 DWORD dwRes = GetNamedSecurityInfoW (path, SE_FILE_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, &pDACL, NULL, NULL);
674 if (dwRes != ERROR_SUCCESS)
677 /* We check that Everyone is still limited to READ-ONLY -
678 but not if new entries have been added by an Administrator */
680 pEveryoneSid = GetEveryoneSid ();
682 ACCESS_MASK rights = GetRightsFromSid (pEveryoneSid, pDACL);
683 /* http://msdn.microsoft.com/library/en-us/security/security/generic_access_rights.asp?frame=true */
684 success = (rights == (READ_CONTROL | SYNCHRONIZE | FILE_READ_DATA | FILE_READ_EA | FILE_READ_ATTRIBUTES));
685 FreeSid (pEveryoneSid);
687 /* Note: we don't need to check our own access -
688 we'll know soon enough when reading the file */
698 IsUserProtected (gunichar2 *path)
700 gboolean success = FALSE;
702 PSID pEveryoneSid = NULL;
704 DWORD dwRes = GetNamedSecurityInfoW (path, SE_FILE_OBJECT,
705 DACL_SECURITY_INFORMATION, NULL, NULL, &pDACL, NULL, NULL);
706 if (dwRes != ERROR_SUCCESS)
709 /* We check that our original entries in the ACL are in place -
710 but not if new entries have been added by the user */
712 /* Everyone should be denied */
713 pEveryoneSid = GetEveryoneSid ();
715 ACCESS_MASK rights = GetRightsFromSid (pEveryoneSid, pDACL);
716 success = (rights == 0);
717 FreeSid (pEveryoneSid);
719 /* Note: we don't need to check our own access -
720 we'll know soon enough when reading the file */
730 ProtectMachine (gunichar2 *path)
732 PSID pEveryoneSid = GetEveryoneSid ();
733 PSID pAdminsSid = GetAdministratorsSid ();
736 if (pEveryoneSid && pAdminsSid) {
738 EXPLICIT_ACCESS ea [2];
739 ZeroMemory (&ea, 2 * sizeof (EXPLICIT_ACCESS));
741 /* grant all access to the BUILTIN\Administrators group */
742 BuildTrusteeWithSidW (&ea [0].Trustee, pAdminsSid);
743 ea [0].grfAccessPermissions = GENERIC_ALL;
744 ea [0].grfAccessMode = SET_ACCESS;
745 ea [0].grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
746 ea [0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
747 ea [0].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
749 /* read-only access everyone */
750 BuildTrusteeWithSidW (&ea [1].Trustee, pEveryoneSid);
751 ea [1].grfAccessPermissions = GENERIC_READ;
752 ea [1].grfAccessMode = SET_ACCESS;
753 ea [1].grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
754 ea [1].Trustee.TrusteeForm = TRUSTEE_IS_SID;
755 ea [1].Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
757 retval = SetEntriesInAcl (2, ea, NULL, &pDACL);
758 if (retval == ERROR_SUCCESS) {
759 /* with PROTECTED_DACL_SECURITY_INFORMATION we */
760 /* remove any existing ACL (like inherited ones) */
761 retval = SetNamedSecurityInfo (path, SE_FILE_OBJECT,
762 DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION,
763 NULL, NULL, pDACL, NULL);
770 FreeSid (pEveryoneSid);
772 FreeSid (pAdminsSid);
773 return (retval == ERROR_SUCCESS);
778 ProtectUser (gunichar2 *path)
782 PSID pCurrentSid = GetCurrentUserSid ();
786 ZeroMemory (&ea, sizeof (EXPLICIT_ACCESS));
788 /* grant exclusive access to the current user */
789 BuildTrusteeWithSidW (&ea.Trustee, pCurrentSid);
790 ea.grfAccessPermissions = GENERIC_ALL;
791 ea.grfAccessMode = SET_ACCESS;
792 ea.grfInheritance = SUB_CONTAINERS_AND_OBJECTS_INHERIT;
793 ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
794 ea.Trustee.TrusteeType = TRUSTEE_IS_USER;
796 retval = SetEntriesInAcl (1, &ea, NULL, &pDACL);
797 if (retval == ERROR_SUCCESS) {
798 /* with PROTECTED_DACL_SECURITY_INFORMATION we
799 remove any existing ACL (like inherited ones) */
800 retval = SetNamedSecurityInfo (path, SE_FILE_OBJECT,
801 DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION,
802 NULL, NULL, pDACL, NULL);
807 g_free (pCurrentSid); /* g_malloc0 */
810 return (retval == ERROR_SUCCESS);
816 IsProtected (MonoString *path, gint32 protection)
818 gboolean result = FALSE;
819 gchar *utf8_name = mono_unicode_to_external (mono_string_chars (path));
822 if (stat (utf8_name, &st) == 0) {
823 result = (((st.st_mode & 0777) & protection) == 0);
832 Protect (MonoString *path, gint32 file_mode, gint32 add_dir_mode)
834 gboolean result = FALSE;
835 gchar *utf8_name = mono_unicode_to_external (mono_string_chars (path));
838 if (stat (utf8_name, &st) == 0) {
839 int mode = file_mode;
840 if (st.st_mode & S_IFDIR)
841 mode |= add_dir_mode;
842 result = (chmod (utf8_name, mode) == 0);
849 #endif /* not PLATFORM_WIN32 */
853 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_CanSecure (MonoString *root)
860 /* ACL are nice... unless you have FAT or other uncivilized filesystem */
861 if (!GetVolumeInformation (mono_string_chars (root), NULL, 0, NULL, NULL, (LPDWORD)&flags, NULL, 0))
863 return ((flags & FS_PERSISTENT_ACLS) == FS_PERSISTENT_ACLS);
866 /* we assume some kind of security is applicable outside Windows */
873 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_IsMachineProtected (MonoString *path)
875 gboolean ret = FALSE;
879 /* no one, but the owner, should have write access to the directory */
880 #ifdef PLATFORM_WIN32
881 ret = IsMachineProtected (mono_string_chars (path));
883 ret = IsProtected (path, (S_IWGRP | S_IWOTH));
890 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_IsUserProtected (MonoString *path)
892 gboolean ret = FALSE;
896 /* no one, but the user, should have access to the directory */
897 #ifdef PLATFORM_WIN32
898 ret = IsUserProtected (mono_string_chars (path));
900 ret = IsProtected (path, (S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH));
907 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_ProtectMachine (MonoString *path)
909 gboolean ret = FALSE;
913 /* read/write to owner, read to everyone else */
914 #ifdef PLATFORM_WIN32
915 ret = ProtectMachine (mono_string_chars (path));
917 ret = Protect (path, (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH), (S_IXUSR | S_IXGRP | S_IXOTH));
924 ves_icall_Mono_Security_Cryptography_KeyPairPersistence_ProtectUser (MonoString *path)
926 gboolean ret = FALSE;
930 /* read/write to user, no access to everyone else */
931 #ifdef PLATFORM_WIN32
932 ret = ProtectUser (mono_string_chars (path));
934 ret = Protect (path, (S_IRUSR | S_IWUSR), S_IXUSR);
941 * Returns TRUE if there is "something" where the Authenticode signature is
942 * normally located. Returns FALSE is data directory is empty.
944 * Note: Neither the structure nor the signature is verified by this function.
947 ves_icall_System_Security_Policy_Evidence_IsAuthenticodePresent (MonoReflectionAssembly *refass)
949 if (refass && refass->assembly && refass->assembly->image) {
950 return mono_image_has_authenticode_entry (refass->assembly->image);