* Makefile.in: Add object files `sec_helper.cc' and `sec_acl.cc'.

        * security.cc: Swap out several functions.
        * sec_acl.cc: New file. Move Sun compatibel ACL functions from
        `security.cc' to here.
        * sec_helper.cc: New file. Move security helper functions from
        `security.cc' to here.
        * security.h: Changed to accomodate the above changes.

        * grp.cc: Replace `group_in_memory_p' by `group_state'.
        Eliminate group_sem throughout.
        (enum grp_state): New enumeration type.
        (read_etc_group): Make race safe.
        * security.cc: Eliminate group_sem throughout.

1 files changed, 399 insertions, 0 deletions

diff --git a/winsup/cygwin/sec_helper.cc b/winsup/cygwin/sec_helper.cc
new file mode 100644
index 000000000..1771d934c
--- /dev/null
+++ b/winsup/cygwin/sec_helper.cc
@@ -0,0 +1,399 @@
+/* sec_helper.cc: NT security helper functions
+
+   Copyright 2000, 2001 Cygnus Solutions.
+
+   Written by Corinna Vinschen <corinna@vinschen.de>
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#include "winsup.h"
+#include <grp.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/acl.h>
+#include <ctype.h>
+#include <wingdi.h>
+#include <winuser.h>
+#include "cygerrno.h"
+#include "perprocess.h"
+#include "fhandler.h"
+#include "path.h"
+#include "dtable.h"
+#include "sync.h"
+#include "sigproc.h"
+#include "pinfo.h"
+#include "cygheap.h"
+#include "security.h"
+
+SID_IDENTIFIER_AUTHORITY sid_auth[] = {
+        {SECURITY_NULL_SID_AUTHORITY},
+        {SECURITY_WORLD_SID_AUTHORITY},
+        {SECURITY_LOCAL_SID_AUTHORITY},
+        {SECURITY_CREATOR_SID_AUTHORITY},
+        {SECURITY_NON_UNIQUE_AUTHORITY},
+        {SECURITY_NT_AUTHORITY}
+};
+
+char *
+convert_sid_to_string_sid (PSID psid, char *sid_str)
+{
+  char t[32];
+  DWORD i;
+
+  if (!psid || !sid_str)
+    return NULL;
+  strcpy (sid_str, "S-1-");
+  __small_sprintf(t, "%u", GetSidIdentifierAuthority (psid)->Value[5]);
+  strcat (sid_str, t);
+  for (i = 0; i < *GetSidSubAuthorityCount (psid); ++i)
+    {
+      __small_sprintf(t, "-%lu", *GetSidSubAuthority (psid, i));
+      strcat (sid_str, t);
+    }
+  return sid_str;
+}
+
+PSID
+get_sid (PSID psid, DWORD s, DWORD cnt, DWORD *r)
+{
+  DWORD i;
+
+  if (!psid || s > 5 || cnt < 1 || cnt > 8)
+    return NULL;
+
+  InitializeSid(psid, &sid_auth[s], cnt);
+  for (i = 0; i < cnt; ++i)
+    memcpy ((char *) psid + 8 + sizeof (DWORD) * i, &r[i], sizeof (DWORD));
+  return psid;
+}
+
+PSID
+convert_string_sid_to_sid (PSID psid, const char *sid_str)
+{
+  char sid_buf[256];
+  char *t, *lasts;
+  DWORD cnt = 0;
+  DWORD s = 0;
+  DWORD i, r[8];
+
+  if (!sid_str || strncmp (sid_str, "S-1-", 4))
+    return NULL;
+
+  strcpy (sid_buf, sid_str);
+
+  for (t = sid_buf + 4, i = 0;
+       cnt < 8 && (t = strtok_r (t, "-", &lasts));
+       t = NULL, ++i)
+    if (i == 0)
+      s = strtoul (t, NULL, 10);
+    else
+      r[cnt++] = strtoul (t, NULL, 10);
+
+  return get_sid (psid, s, cnt, r);
+}
+
+BOOL
+get_pw_sid (PSID sid, struct passwd *pw)
+{
+  char *sp = pw->pw_gecos ? strrchr (pw->pw_gecos, ',') : NULL;
+
+  if (!sp)
+    return FALSE;
+  return convert_string_sid_to_sid (sid, ++sp) != NULL;
+}
+
+BOOL
+get_gr_sid (PSID sid, struct group *gr)
+{
+  return convert_string_sid_to_sid (sid, gr->gr_passwd) != NULL;
+}
+
+PSID
+get_admin_sid ()
+{
+  static NO_COPY char admin_sid_buf[MAX_SID_LEN];
+  static NO_COPY PSID admin_sid = NULL;
+
+  if (!admin_sid)
+    {
+      admin_sid = (PSID) admin_sid_buf;
+      convert_string_sid_to_sid (admin_sid, "S-1-5-32-544");
+    }
+  return admin_sid;
+}
+
+PSID
+get_system_sid ()
+{
+  static NO_COPY char system_sid_buf[MAX_SID_LEN];
+  static NO_COPY PSID system_sid = NULL;
+
+  if (!system_sid)
+    {
+      system_sid = (PSID) system_sid_buf;
+      convert_string_sid_to_sid (system_sid, "S-1-5-18");
+    }
+  return system_sid;
+}
+
+PSID
+get_creator_owner_sid ()
+{
+  static NO_COPY char owner_sid_buf[MAX_SID_LEN];
+  static NO_COPY PSID owner_sid = NULL;
+
+  if (!owner_sid)
+    {
+      owner_sid = (PSID) owner_sid_buf;
+      convert_string_sid_to_sid (owner_sid, "S-1-3-0");
+    }
+  return owner_sid;
+}
+
+PSID
+get_world_sid ()
+{
+  static NO_COPY char world_sid_buf[MAX_SID_LEN];
+  static NO_COPY PSID world_sid = NULL;
+
+  if (!world_sid)
+    {
+      world_sid = (PSID) world_sid_buf;
+      convert_string_sid_to_sid (world_sid, "S-1-1-0");
+    }
+  return world_sid;
+}
+
+int
+get_id_from_sid (PSID psid, BOOL search_grp, int *type)
+{
+  if (!IsValidSid (psid))
+    {
+      __seterrno ();
+      small_printf ("IsValidSid failed with %E");
+      return -1;
+    }
+
+  /* First try to get SID from passwd or group entry */
+  if (allow_ntsec)
+    {
+      char sidbuf[MAX_SID_LEN];
+      PSID sid = (PSID) sidbuf;
+      int id = -1;
+
+      if (!search_grp)
+	{
+	  struct passwd *pw;
+	  while ((pw = getpwent ()) != NULL)
+	    {
+	      if (get_pw_sid (sid, pw) && EqualSid (psid, sid))
+		{
+		  id = pw->pw_uid;
+		  break;
+		}
+	    }
+	  endpwent ();
+	  if (id >= 0)
+	    {
+	      if (type)
+		*type = USER;
+	      return id;
+	    }
+	}
+      if (search_grp || type)
+	{
+	  struct group *gr;
+	  while ((gr = getgrent ()) != NULL)
+	    {
+	      if (get_gr_sid (sid, gr) && EqualSid (psid, sid))
+		{
+		  id = gr->gr_gid;
+		  break;
+		}
+	    }
+	  endgrent ();
+	  if (id >= 0)
+	    {
+	      if (type)
+		*type = GROUP;
+	      return id;
+	    }
+	}
+    }
+
+  /* We use the RID as default UID/GID */
+  int id = *GetSidSubAuthority(psid, *GetSidSubAuthorityCount(psid) - 1);
+
+  /*
+   * The RID maybe -1 if accountname == computername.
+   * In this case we search for the accountname in the passwd and group files.
+   * If type is needed, we search in each case.
+   */
+  if (id == -1 || type)
+    {
+      char account[MAX_USER_NAME];
+      char domain[MAX_COMPUTERNAME_LENGTH+1];
+      DWORD acc_len = MAX_USER_NAME;
+      DWORD dom_len = MAX_COMPUTERNAME_LENGTH+1;
+      SID_NAME_USE acc_type;
+
+      if (!LookupAccountSid (NULL, psid, account, &acc_len,
+			     domain, &dom_len, &acc_type))
+	{
+	  __seterrno ();
+	  return -1;
+	}
+
+      switch (acc_type)
+	{
+	  case SidTypeGroup:
+	  case SidTypeAlias:
+	  case SidTypeWellKnownGroup:
+	    if (type)
+	      *type = GROUP;
+	    if (id == -1)
+	      {
+		struct group *gr = getgrnam (account);
+		if (gr)
+		  id = gr->gr_gid;
+	      }
+	    break;
+	  case SidTypeUser:
+	    if (type)
+	      *type = USER;
+	    if (id == -1)
+	      {
+		struct passwd *pw = getpwnam (account);
+		if (pw)
+		  id = pw->pw_uid;
+	      }
+	    break;
+	  default:
+	    break;
+	}
+    }
+  if (id == -1)
+    id = getuid ();
+  return id;
+}
+
+int
+get_id_from_sid (PSID psid, BOOL search_grp)
+{
+  return get_id_from_sid (psid, search_grp, NULL);
+}
+
+BOOL
+legal_sid_type (SID_NAME_USE type)
+{
+  return type == SidTypeUser || type == SidTypeGroup
+		 || SidTypeAlias || SidTypeWellKnownGroup;
+}
+
+BOOL
+is_grp_member (uid_t uid, gid_t gid)
+{
+  extern int getgroups (int, gid_t *, gid_t, const char *);
+  BOOL grp_member = TRUE;
+
+  struct passwd *pw = getpwuid (uid);
+  gid_t grps[NGROUPS_MAX];
+  int cnt = getgroups (NGROUPS_MAX, grps,
+		       pw ? pw->pw_gid : myself->gid,
+		       pw ? pw->pw_name : cygheap->user.name ());
+  int i;
+  for (i = 0; i < cnt; ++i)
+    if (grps[i] == gid)
+      break;
+  grp_member = (i < cnt);
+  return grp_member;
+}
+
+BOOL
+lookup_name (const char *name, const char *logsrv, PSID ret_sid)
+{
+  char sidbuf[MAX_SID_LEN];
+  PSID sid = (PSID) sidbuf;
+  DWORD sidlen;
+  char domuser[MAX_COMPUTERNAME_LENGTH+MAX_USER_NAME+1];
+  char dom[MAX_COMPUTERNAME_LENGTH+1];
+  DWORD domlen;
+  SID_NAME_USE acc_type;
+
+  debug_printf ("name  : %s", name ? name : "NULL");
+
+  if (!name)
+    return FALSE;
+
+  if (cygheap->user.domain ())
+    {
+      strcat (strcat (strcpy (domuser, cygheap->user.domain ()), "\\"), name);
+      if (LookupAccountName (NULL, domuser,
+			     sid, (sidlen = MAX_SID_LEN, &sidlen),
+			     dom, (domlen = MAX_COMPUTERNAME_LENGTH, &domlen),
+			     &acc_type)
+	  && legal_sid_type (acc_type))
+	goto got_it;
+      if (logsrv && *logsrv
+	  && LookupAccountName (logsrv, domuser,
+				sid, (sidlen = MAX_SID_LEN, &sidlen),
+				dom, (domlen = MAX_COMPUTERNAME_LENGTH,&domlen),
+				&acc_type)
+	  && legal_sid_type (acc_type))
+	goto got_it;
+    }
+  if (logsrv && *logsrv)
+    {
+      if (LookupAccountName (logsrv, name,
+			     sid, (sidlen = MAX_SID_LEN, &sidlen),
+			     dom, (domlen = MAX_COMPUTERNAME_LENGTH, &domlen),
+			     &acc_type)
+	  && legal_sid_type (acc_type))
+	goto got_it;
+      if (acc_type == SidTypeDomain)
+	{
+	  strcat (strcat (strcpy (domuser, dom), "\\"), name);
+	  if (LookupAccountName (logsrv, domuser,
+				 sid,(sidlen = MAX_SID_LEN, &sidlen),
+				 dom,(domlen = MAX_COMPUTERNAME_LENGTH,&domlen),
+				 &acc_type))
+	    goto got_it;
+	}
+    }
+  if (LookupAccountName (NULL, name,
+			 sid, (sidlen = MAX_SID_LEN, &sidlen),
+			 dom, (domlen = 100, &domlen),
+			 &acc_type)
+      && legal_sid_type (acc_type))
+    goto got_it;
+  if (acc_type == SidTypeDomain)
+    {
+      strcat (strcat (strcpy (domuser, dom), "\\"), name);
+      if (LookupAccountName (NULL, domuser,
+			     sid, (sidlen = MAX_SID_LEN, &sidlen),
+			     dom, (domlen = MAX_COMPUTERNAME_LENGTH, &domlen),
+			     &acc_type))
+	goto got_it;
+    }
+  debug_printf ("LookupAccountName(%s) %E", name);
+  __seterrno ();
+  return FALSE;
+
+got_it:
+  debug_printf ("sid : [%d]", *GetSidSubAuthority((PSID) sid,
+			      *GetSidSubAuthorityCount((PSID) sid) - 1));
+
+  if (ret_sid)
+    memcpy (ret_sid, sid, sidlen);
+
+  return TRUE;
+}