162 lines
4.3 KiB
C
162 lines
4.3 KiB
C
/*
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* Virtio 9p system.posix* xattr callback
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include <sys/types.h>
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#include "qemu/xattr.h"
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#include "hw/virtio.h"
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#include "virtio-9p.h"
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#include "fsdev/file-op-9p.h"
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#include "virtio-9p-xattr.h"
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#define MAP_ACL_ACCESS "user.virtfs.system.posix_acl_access"
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#define MAP_ACL_DEFAULT "user.virtfs.system.posix_acl_default"
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#define ACL_ACCESS "system.posix_acl_access"
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#define ACL_DEFAULT "system.posix_acl_default"
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static ssize_t mp_pacl_getxattr(FsContext *ctx, const char *path,
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const char *name, void *value, size_t size)
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{
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char buffer[PATH_MAX];
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return lgetxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value, size);
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}
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static ssize_t mp_pacl_listxattr(FsContext *ctx, const char *path,
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char *name, void *value, size_t osize)
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{
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ssize_t len = sizeof(ACL_ACCESS);
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if (!value) {
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return len;
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}
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if (osize < len) {
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errno = ERANGE;
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return -1;
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}
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/* len includes the trailing NUL */
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memcpy(value, ACL_ACCESS, len);
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return 0;
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}
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static int mp_pacl_setxattr(FsContext *ctx, const char *path, const char *name,
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void *value, size_t size, int flags)
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{
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char buffer[PATH_MAX];
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return lsetxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value,
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size, flags);
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}
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static int mp_pacl_removexattr(FsContext *ctx,
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const char *path, const char *name)
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{
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int ret;
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char buffer[PATH_MAX];
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ret = lremovexattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS);
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if (ret == -1 && errno == ENODATA) {
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/*
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* We don't get ENODATA error when trying to remove a
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* posix acl that is not present. So don't throw the error
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* even in case of mapped security model
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*/
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errno = 0;
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ret = 0;
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}
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return ret;
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}
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static ssize_t mp_dacl_getxattr(FsContext *ctx, const char *path,
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const char *name, void *value, size_t size)
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{
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char buffer[PATH_MAX];
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return lgetxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value, size);
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}
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static ssize_t mp_dacl_listxattr(FsContext *ctx, const char *path,
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char *name, void *value, size_t osize)
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{
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ssize_t len = sizeof(ACL_DEFAULT);
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if (!value) {
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return len;
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}
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if (osize < len) {
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errno = ERANGE;
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return -1;
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}
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/* len includes the trailing NUL */
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memcpy(value, ACL_ACCESS, len);
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return 0;
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}
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static int mp_dacl_setxattr(FsContext *ctx, const char *path, const char *name,
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void *value, size_t size, int flags)
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{
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char buffer[PATH_MAX];
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return lsetxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value,
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size, flags);
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}
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static int mp_dacl_removexattr(FsContext *ctx,
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const char *path, const char *name)
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{
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int ret;
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char buffer[PATH_MAX];
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ret = lremovexattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT);
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if (ret == -1 && errno == ENODATA) {
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/*
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* We don't get ENODATA error when trying to remove a
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* posix acl that is not present. So don't throw the error
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* even in case of mapped security model
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*/
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errno = 0;
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ret = 0;
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}
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return ret;
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}
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XattrOperations mapped_pacl_xattr = {
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.name = "system.posix_acl_access",
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.getxattr = mp_pacl_getxattr,
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.setxattr = mp_pacl_setxattr,
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.listxattr = mp_pacl_listxattr,
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.removexattr = mp_pacl_removexattr,
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};
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XattrOperations mapped_dacl_xattr = {
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.name = "system.posix_acl_default",
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.getxattr = mp_dacl_getxattr,
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.setxattr = mp_dacl_setxattr,
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.listxattr = mp_dacl_listxattr,
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.removexattr = mp_dacl_removexattr,
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};
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XattrOperations passthrough_acl_xattr = {
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.name = "system.posix_acl_",
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.getxattr = pt_getxattr,
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.setxattr = pt_setxattr,
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.listxattr = pt_listxattr,
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.removexattr = pt_removexattr,
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};
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XattrOperations none_acl_xattr = {
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.name = "system.posix_acl_",
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.getxattr = notsup_getxattr,
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.setxattr = notsup_setxattr,
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.listxattr = notsup_listxattr,
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.removexattr = notsup_removexattr,
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};
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