* cygwin.din: Define symbols for `cygwin_logon_user' and

        `cygwin_set_impersonation_token'.
        * dcrt0.cc (dll_crt0_1): Eliminate superfluous conditional
        statements.
        Add load statements for `ImpersonateLoggedOnUser', `LogonUserA'
        and `RevertToSelf'.
        * fork.cc (fork): Care for correct impersonation of parent
        and child process.
        * security.cc (cygwin_set_impersonation_token): New function.
        (cygwin_logon_user): Ditto.
        shared.h (class pinfo): New members `orig_uid', `orig_gid',
        `real_uid' nad `real_gid'.
        spawn.cc (spawn_guts): Care for impersonation when starting
        child process in a different user context.
        * syscalls.cc (setgid): Call `setegid' now. Set real_gid.
        (setuid): Call `seteuid' now. Set real_uid.
        (seteuid): Functionality moved from setuid to here. Care for
        correct impersonation.
        (setegid): Functionality moved from setgid to here.
        * uinfo.cc (uinfo_init): Initialization of additional pinfo
        members.
        (getuid): Return real uid.
        (getgid): Return real gid.
        (geteuid): Return effective uid.
        (getegid): Return effective gid.
        include/sys/cygwin.h: Add prototypes for `cygwin_logon_user' and
        `cygwin_set_impersonation_token'.
        include/cygwin/version.h: Bumb API minor version to 22.

1 files changed, 9 insertions, 4 deletions

diff --git a/winsup/cygwin/uinfo.cc b/winsup/cygwin/uinfo.cc
index 90bb727..b50f155 100644
--- a/winsup/cygwin/uinfo.cc
+++ b/winsup/cygwin/uinfo.cc
@@ -126,6 +126,11 @@ uinfo_init ()
       myself->uid = DEFAULT_UID;
       myself->gid = DEFAULT_GID;
     }
+  /* Set to non impersonated value. */
+  myself->token = INVALID_HANDLE_VALUE;
+  myself->impersonated = TRUE;
+  myself->orig_uid = myself->real_uid = myself->uid;
+  myself->orig_gid = myself->real_gid = myself->gid;
 }
 
 extern "C" char *
@@ -143,25 +148,25 @@ getlogin (void)
 extern "C" uid_t
 getuid (void)
 {
-  return myself->uid;
+  return myself->real_uid;
 }
 
 extern "C" gid_t
 getgid (void)
 {
-  return myself->gid;
+  return myself->real_gid;
 }
 
 extern "C" uid_t
 geteuid (void)
 {
-  return getuid ();
+  return myself->uid;
 }
 
 extern "C" gid_t
 getegid (void)
 {
-  return getgid ();
+  return myself->gid;
 }
 
 /* Not quite right - cuserid can change, getlogin can't */