diff options
| -rw-r--r-- | libfshelp/Makefile | 3 | ||||
| -rw-r--r-- | libfshelp/fshelp.h | 9 | ||||
| -rw-r--r-- | libfshelp/perms-iscontroller.c | 38 |
3 files changed, 48 insertions, 2 deletions
diff --git a/libfshelp/Makefile b/libfshelp/Makefile index 6dc47da6..11c14985 100644 --- a/libfshelp/Makefile +++ b/libfshelp/Makefile @@ -27,7 +27,8 @@ SRCS = lock-acquire.c lock-init.c \ exec-reauth.c \ set-options.c \ get-identity.c \ - perms-isowner.c perms-access.c perms-checkdirmod.c \ + perms-isowner.c perms-iscontroller.c perms-access.c \ + perms-checkdirmod.c \ touch.c LCLHDRS = fshelp.h locks.h trans.h installhdrs = fshelp.h diff --git a/libfshelp/fshelp.h b/libfshelp/fshelp.h index 81e1fadb..88f63b69 100644 --- a/libfshelp/fshelp.h +++ b/libfshelp/fshelp.h @@ -1,5 +1,5 @@ /* FS helper library definitions - Copyright (C) 1994,95,96,97,98,99,2000 Free Software Foundation, Inc. + Copyright (C) 1994,95,96,97,98,99,2000,01 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as @@ -238,6 +238,13 @@ error_t fshelp_set_options (struct argp *argp, int flags, appropriate error code. */ error_t fshelp_isowner (struct stat *st, struct iouser *user); +/* Check to see whether USER should be considered a controller of the + filesystem. Which is to say, check to see if we should give USER the + control port. ST is the stat of the root node. USER is the user + asking for a send right to the control port. */ +error_t +fshelp_iscontroller (struct stat *st, struct iouser *user); + /* Check to see whether the user USER can operate on a file identified by ST. OP is one of S_IREAD, S_IWRITE, and S_IEXEC. If the access is permitted, return zero; otherwise return an appropriate error diff --git a/libfshelp/perms-iscontroller.c b/libfshelp/perms-iscontroller.c new file mode 100644 index 00000000..456da2a2 --- /dev/null +++ b/libfshelp/perms-iscontroller.c @@ -0,0 +1,38 @@ +/* see whether a user should be considered a controller of the filesystem + Copyright (C) 2001 Free Software Foundation, Inc. + Written by Neal H Walfield <neal@cs.uml.edu>. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#include <unistd.h> +#include "fshelp.h" + +/* Check to see whether USER should be considered a controller of the + filesystem. Which is to say, check to see if we should give USER the + control port. ST is the stat of the root node. USER is the user + asking for a send right to the control port. */ +error_t +fshelp_iscontroller (struct stat *st, struct iouser *user) +{ + /* Permitted if USER has the superuser uid, the owner uid or if the + USER has authority over the process's effective id. */ + if (idvec_contains (user->uids, st->st_uid) + || idvec_contains (user->uids, st->st_uid) + || idvec_contains (user->uids, geteuid ())) + return 0; + return EPERM; +} |