166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
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/* This file deals with protection in the file system. It contains the code
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* for four system calls that relate to protection.
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*
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* The entry points into this file are
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* do_chmod: perform the CHMOD and FCHMOD system calls
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* do_chown: perform the CHOWN and FCHOWN system calls
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* do_umask: perform the UMASK system call
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* do_access: perform the ACCESS system call
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*
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* Changes for VFS:
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* Jul 2006 (Balazs Gerofi)
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*/
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#include "fs.h"
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#include <unistd.h>
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#include <minix/callnr.h>
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#include "file.h"
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#include "fproc.h"
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#include "param.h"
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#include <minix/vfsif.h>
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#include "vnode.h"
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#include "vmnt.h"
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/*===========================================================================*
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* do_chmod *
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*===========================================================================*/
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PUBLIC int do_chmod()
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{
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struct filp *flp;
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struct chmod_req req;
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struct lookup_req lookup_req;
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struct node_details res;
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int r;
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if (call_nr == CHMOD) {
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/* Perform the chmod(name, mode) system call. */
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if (fetch_name(m_in.name, m_in.name_length, M3) != OK) return(err_code);
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/* Fill in lookup request fields */
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lookup_req.path = user_fullpath;
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lookup_req.lastc = NULL;
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lookup_req.flags = EAT_PATH;
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/* Request lookup */
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if ((r = lookup(&lookup_req, &res)) != OK) return r;
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req.inode_nr = res.inode_nr;
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req.fs_e = res.fs_e;
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}
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else if (call_nr == FCHMOD) {
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if (!(flp = get_filp(m_in.m3_i1))) return err_code;
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req.inode_nr = flp->filp_vno->v_inode_nr;
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req.fs_e = flp->filp_vno->v_fs_e;
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}
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else panic(__FILE__, "do_chmod called with strange call_nr", call_nr);
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/* Fill in request message fields.*/
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req.uid = fp->fp_effuid;
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req.gid = fp->fp_effgid;
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req.rmode = m_in.mode;
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/* Issue request */
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return req_chmod(&req);
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}
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/*===========================================================================*
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* do_chown *
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*===========================================================================*/
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PUBLIC int do_chown()
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{
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int inode_nr;
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int fs_e;
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struct filp *flp;
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struct chown_req req;
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struct lookup_req lookup_req;
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struct node_details res;
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int r;
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if (call_nr == CHOWN) {
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/* Perform the chmod(name, mode) system call. */
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if (fetch_name(m_in.name1, m_in.name1_length, M1) != OK) return(err_code);
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/* Fill in lookup request fields */
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lookup_req.path = user_fullpath;
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lookup_req.lastc = NULL;
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lookup_req.flags = EAT_PATH;
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/* Request lookup */
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if ((r = lookup(&lookup_req, &res)) != OK) return r;
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req.inode_nr = res.inode_nr;
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req.fs_e = res.fs_e;
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}
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else if (call_nr == FCHOWN) {
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if (!(flp = get_filp(m_in.m1_i1))) return err_code;
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req.inode_nr = flp->filp_vno->v_inode_nr;
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req.fs_e = flp->filp_vno->v_fs_e;
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}
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else panic(__FILE__, "do_chmod called with strange call_nr", call_nr);
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/* Fill in request message fields.*/
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req.uid = fp->fp_effuid;
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req.gid = fp->fp_effgid;
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req.newuid = m_in.owner;
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req.newgid = m_in.group;
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/* Issue request */
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return req_chown(&req);
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}
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/*===========================================================================*
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* do_umask *
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*===========================================================================*/
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PUBLIC int do_umask()
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{
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/* Perform the umask(co_mode) system call. */
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register mode_t r;
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r = ~fp->fp_umask; /* set 'r' to complement of old mask */
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fp->fp_umask = ~(m_in.co_mode & RWX_MODES);
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return(r); /* return complement of old mask */
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}
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/*===========================================================================*
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* do_access *
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*===========================================================================*/
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PUBLIC int do_access()
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{
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/* Perform the access(name, mode) system call. */
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struct access_req req;
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struct lookup_req lookup_req;
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struct node_details res;
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int r;
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/* First check to see if the mode is correct. */
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if ( (m_in.mode & ~(R_OK | W_OK | X_OK)) != 0 && m_in.mode != F_OK)
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return(EINVAL);
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if (fetch_name(m_in.name, m_in.name_length, M3) != OK) return(err_code);
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/* Fill in lookup request fields */
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lookup_req.path = user_fullpath;
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lookup_req.lastc = NULL;
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lookup_req.flags = EAT_PATH;
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/* Request lookup */
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if ((r = lookup(&lookup_req, &res)) != OK) return r;
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/* Fill in request fields */
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req.fs_e = res.fs_e;
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req.amode = m_in.mode;
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req.inode_nr = res.inode_nr;
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req.uid = fp->fp_realuid; /* real user and group id */
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req.gid = fp->fp_realgid;
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/* Issue request */
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return req_access(&req);
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}
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