* passwd.c (main): Add the ability to specify a username for the -R

command.
	* utils.sgml: Document the aforementioned change.

winsup/utils/ChangeLog

@@ -1,3 +1,9 @@
+2011-04-04  Corinna Vinschen  <corinna@vinschen.de>
+
+	* passwd.c (main): Add the ability to specify a username for the -R
+	command.
+	* utils.sgml: Document the aforementioned change.
+
 2011-02-29  Corinna Vinschen  <corinna@vinschen.de>
 
 	* regtool.cc (cmd_set): Avoid a compiler warning.

winsup/utils/passwd.c

@@ -1,6 +1,6 @@
 /* passwd.c: Changing passwords and managing account information
 
-   Copyright 1999, 2000, 2001, 2002, 2003, 2008, 2009 Red Hat, Inc.
+   Copyright 1999, 2000, 2001, 2002, 2003, 2008, 2009, 2011 Red Hat, Inc.
 
    Written by Corinna Vinschen <corinna.vinschen@cityweb.de>
 
@@ -544,8 +544,26 @@ main (int argc, char **argv)
 
   if (Ropt)
     {
+      const char *username = NULL;
+      if (optind < argc)
+	{
+	  username = argv[optind++];
+	  if (!strcmp (username, getlogin ()))
+	    username = NULL;
+	  else if (!caller_is_admin ())
+	    return eprint (0, "You may not change the password for %s.", user);
+
 	  if (optind < argc)
 	    usage (stderr, 1);
+	}
+      char *text1 = (char *) alloca ((username ? strlen (username) + 2 : 4)
+				     + sizeof ("Enter  current password: "));
+      char *text2 = (char *) alloca ((username ? strlen (username) + 2 : 4)
+				     + sizeof ("Re-enter  current password: "));
+      sprintf (text1, "Enter %s%s current password: ",
+	       username ?: "your", username ? "'s" : "");
+      sprintf (text2, "Re-enter %s%s current password: ",
+	       username ?: "your", username ? "'s" : "");
       printf (
 "This functionality stores a password in the registry for usage by services\n"
 "which need to change the user context and require network access.  Typical\n"
@@ -556,11 +574,11 @@ main (int argc, char **argv)
 "secure.  Use this feature only if the machine is adequately locked down.\n"
 "Don't use this feature if you don't need network access within a remote\n"
 "session.\n\n"
-"You can delete your stored password by specifying an empty password.\n\n");
+"You can delete the stored password by specifying an empty password.\n\n");
-      strcpy (newpwd, getpass ("Enter your current password: "));
+      strcpy (newpwd, getpass (text1));
-      if (strcmp (newpwd, getpass ("Re-enter your current password: ")))
+      if (strcmp (newpwd, getpass (text2)))
         eprint (0, "Password is not identical.");
-      else if (cygwin_internal (CW_SET_PRIV_KEY, newpwd))
+      else if (cygwin_internal (CW_SET_PRIV_KEY, newpwd, username))
 	return eprint (0, "Storing password failed: %s", strerror (errno));
       return 0;
     }

winsup/utils/utils.sgml

@@ -1307,12 +1307,14 @@ drawbacks security-wise.  This is explained in more detail in
 
 <para>Please note that storing passwords in that registry area is a
 privileged operation which only administrative accounts are allowed to
-do.  If normal, non-admin users should be allowed to enter their
+do.  Administrators can enter the password for other user accounts into
-passwords using <command>passwd -R</command>, it's required to run
+the registry by specifying the username on the commandline.  If normal,
-<command>cygserver</command> as a service under the LocalSystem account
+non-admin users should be allowed to enter their passwords using
-before running <command>passwd -R</command>.  This only affects storing
+<command>passwd -R</command>, it's required to run <command>cygserver</command>
-passwords.  Using passwords in privileged processes does not require
+as a service under the LocalSystem account before running
-<command>cygserver</command> to run.</para>
+<command>passwd -R</command>.  This only affects storing passwords.  Using
+passwords in privileged processes does not require <command>cygserver</command>
+to run.</para>
 
 <para>Limitations: Users may not be able to change their password on
 some systems.</para>