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virtio-9p: Make infrastructure for the new security model.

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This patch adds required infrastructure for the new security model.

- A new configure option for attr/xattr.
- if CONFIG_VIRTFS will be defined if both CONFIG_LINUX and CONFIG_ATTR defined.
- Defines routines related to both security models.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2010-06-14 13:34:41 -07:00 • committed by Anthony Liguori
parent 9ce56db6f0
commit 758e8e38eb
8 changed files with 114 additions and 53 deletions
Download patch file Download diff file Expand all files Collapse all files

65
hw/virtio-9p-local.c
View file

@ -17,6 +17,7 @@
#include <grp.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <attr/xattr.h>
static const char *rpath(FsContext *ctx, const char *path)
{
@ -31,45 +32,37 @@ static int local_lstat(FsContext *ctx, const char *path, struct stat *stbuf)
return lstat(rpath(ctx, path), stbuf);
}
static int local_setuid(FsContext *ctx, uid_t uid)
static int local_set_xattr(const char *path, FsCred *credp)
{
struct passwd *pw;
gid_t groups[33];
int ngroups;
static uid_t cur_uid = -1;
if (cur_uid == uid) {
return 0;
int err;
if (credp->fc_uid != -1) {
err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t),
0);
if (err) {
return err;
}
}
if (setreuid(0, 0)) {
return -1;
if (credp->fc_gid != -1) {
err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t),
0);
if (err) {
return err;
}
}
pw = getpwuid(uid);
if (pw == NULL) {
return -1;
if (credp->fc_mode != -1) {
err = setxattr(path, "user.virtfs.mode", &credp->fc_mode,
sizeof(mode_t), 0);
if (err) {
return err;
}
}
ngroups = 33;
if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1) {
return -1;
if (credp->fc_rdev != -1) {
err = setxattr(path, "user.virtfs.rdev", &credp->fc_rdev,
sizeof(dev_t), 0);
if (err) {
return err;
}
}
if (setgroups(ngroups, groups)) {
return -1;
}
if (setregid(-1, pw->pw_gid)) {
return -1;
}
if (setreuid(-1, uid)) {
return -1;
}
cur_uid = uid;
return 0;
}
@ -183,6 +176,7 @@ static int local_open2(FsContext *ctx, const char *path, int flags, mode_t mode)
return open(rpath(ctx, path), flags, mode);
}
static int local_symlink(FsContext *ctx, const char *oldpath,
const char *newpath)
{
@ -259,12 +253,13 @@ static int local_remove(FsContext *ctx, const char *path)
static int local_fsync(FsContext *ctx, int fd)
{
if (0) /* Just to supress the warning. Will be removed in next patch. */
(void)local_set_xattr(NULL, NULL);
return fsync(fd);
}
FileOperations local_ops = {
.lstat = local_lstat,
.setuid = local_setuid,
.readlink = local_readlink,
.close = local_close,
.closedir = local_closedir,