int
gr_acl_handle_rename(struct dentry *new_dentry,
struct dentry *parent_dentry,
const struct vfsmount *parent_mnt,
struct dentry *old_dentry,
struct inode *old_parent_inode,
struct vfsmount *old_mnt, const struct filename *newname, unsigned int flags)
{
__u32 comp1, comp2;
int error = 0;
if (unlikely(!gr_acl_is_enabled()))
return 0;
if (flags & RENAME_EXCHANGE) {
comp1 = gr_search_file(new_dentry, GR_READ | GR_WRITE |
GR_AUDIT_READ | GR_AUDIT_WRITE |
GR_SUPPRESS, parent_mnt);
comp2 =
gr_search_file(old_dentry,
GR_READ | GR_WRITE | GR_AUDIT_READ |
GR_AUDIT_WRITE | GR_SUPPRESS, old_mnt);
} else if (d_is_negative(new_dentry)) {
comp1 = gr_check_create(new_dentry, parent_dentry, parent_mnt,
GR_READ | GR_WRITE | GR_CREATE | GR_AUDIT_READ |
GR_AUDIT_WRITE | GR_AUDIT_CREATE | GR_SUPPRESS);
comp2 = gr_search_file(old_dentry, GR_READ | GR_WRITE |
GR_DELETE | GR_AUDIT_DELETE |
GR_AUDIT_READ | GR_AUDIT_WRITE |
GR_SUPPRESS, old_mnt);
} else {
comp1 = gr_search_file(new_dentry, GR_READ | GR_WRITE |
GR_CREATE | GR_DELETE |
GR_AUDIT_CREATE | GR_AUDIT_DELETE |
GR_AUDIT_READ | GR_AUDIT_WRITE |
GR_SUPPRESS, parent_mnt);
comp2 =
gr_search_file(old_dentry,
GR_READ | GR_WRITE | GR_AUDIT_READ |
GR_DELETE | GR_AUDIT_DELETE |
GR_AUDIT_WRITE | GR_SUPPRESS, old_mnt);
}
if (RENAME_CHECK_SUCCESS(comp1, comp2) &&
((comp1 & GR_AUDITS) || (comp2 & GR_AUDITS)))
gr_log_fs_rbac_str(GR_DO_AUDIT, GR_RENAME_ACL_MSG, old_dentry, old_mnt, newname->name);
else if (!RENAME_CHECK_SUCCESS(comp1, comp2) && !(comp1 & GR_SUPPRESS)
&& !(comp2 & GR_SUPPRESS)) {
gr_log_fs_rbac_str(GR_DONT_AUDIT, GR_RENAME_ACL_MSG, old_dentry, old_mnt, newname->name);
error = -EACCES;
} else if (unlikely(!RENAME_CHECK_SUCCESS(comp1, comp2)))
error = -EACCES;
return error;
}
static __u32 generic_fs_create_handler(const struct dentry *new_dentry, const struct dentry *parent_dentry, const struct vfsmount *parent_mnt, __u32 reqmode, const char *fmt)
{
__u32 mode;
mode = gr_check_create(new_dentry, parent_dentry, parent_mnt, reqmode | to_gr_audit(reqmode) | GR_SUPPRESS);
if (unlikely(((mode & (reqmode)) == (reqmode)) && mode & GR_AUDITS)) {
gr_log_fs_rbac_generic(GR_DO_AUDIT, fmt, new_dentry, parent_mnt);
return mode;
} else if (unlikely((mode & (reqmode)) != (reqmode) && !(mode & GR_SUPPRESS))) {
gr_log_fs_rbac_generic(GR_DONT_AUDIT, fmt, new_dentry, parent_mnt);
return 0;
} else if (unlikely((mode & (reqmode)) != (reqmode)))
return 0;
return (reqmode);
}
__u32
gr_acl_handle_creat(const struct dentry * dentry,
const struct dentry * p_dentry,
const struct vfsmount * p_mnt, int open_flags, int acc_mode,
const int imode)
{
__u32 reqmode = GR_WRITE | GR_CREATE;
__u32 mode;
if (acc_mode & MAY_APPEND)
reqmode |= GR_APPEND;
// if a directory was required or the directory already exists, then
// don't count this open as a read
if ((acc_mode & MAY_READ) &&
!((open_flags & O_DIRECTORY) || d_is_dir(dentry)))
reqmode |= GR_READ;
if ((open_flags & O_CREAT) &&
((imode & S_ISUID) || ((imode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP))))
reqmode |= GR_SETID;
mode =
gr_check_create(dentry, p_dentry, p_mnt,
reqmode | to_gr_audit(reqmode) | GR_SUPPRESS);
if (unlikely(((mode & reqmode) == reqmode) && mode & GR_AUDITS)) {
gr_log_fs_rbac_mode2(GR_DO_AUDIT, GR_CREATE_ACL_MSG, dentry, p_mnt,
reqmode & GR_READ ? " reading" : "",
reqmode & GR_WRITE ? " writing" : reqmode &
GR_APPEND ? " appending" : "");
return reqmode;
} else
if (unlikely((mode & reqmode) != reqmode && !(mode & GR_SUPPRESS)))
{
gr_log_fs_rbac_mode2(GR_DONT_AUDIT, GR_CREATE_ACL_MSG, dentry, p_mnt,
reqmode & GR_READ ? " reading" : "",
reqmode & GR_WRITE ? " writing" : reqmode &
GR_APPEND ? " appending" : "");
return 0;
} else if (unlikely((mode & reqmode) != reqmode))
return 0;
return reqmode;
}
__u32
gr_acl_handle_creat(const struct dentry * dentry,
const struct dentry * p_dentry,
const struct vfsmount * p_mnt, const int fmode,
const int imode)
{
__u32 reqmode = GR_WRITE | GR_CREATE;
__u32 mode;
if (unlikely(fmode & O_APPEND))
reqmode |= GR_APPEND;
if (unlikely((fmode & FMODE_READ) && !(fmode & O_DIRECTORY)))
reqmode |= GR_READ;
if (unlikely((fmode & O_CREAT) && (imode & (S_ISUID | S_ISGID))))
reqmode |= GR_SETID;
mode =
gr_check_create(dentry, p_dentry, p_mnt,
reqmode | to_gr_audit(reqmode) | GR_SUPPRESS);
if (unlikely(((mode & reqmode) == reqmode) && mode & GR_AUDITS)) {
gr_log_fs_rbac_mode2(GR_DO_AUDIT, GR_CREATE_ACL_MSG, dentry, p_mnt,
reqmode & GR_READ ? " reading" : "",
reqmode & GR_WRITE ? " writing" : reqmode &
GR_APPEND ? " appending" : "");
return reqmode;
} else
if (unlikely((mode & reqmode) != reqmode && !(mode & GR_SUPPRESS)))
{
gr_log_fs_rbac_mode2(GR_DONT_AUDIT, GR_CREATE_ACL_MSG, dentry, p_mnt,
reqmode & GR_READ ? " reading" : "",
reqmode & GR_WRITE ? " writing" : reqmode &
GR_APPEND ? " appending" : "");
return 0;
} else if (unlikely((mode & reqmode) != reqmode))
return 0;
return reqmode;
}
__u32
gr_acl_handle_symlink(const struct dentry * new_dentry,
const struct dentry * parent_dentry,
const struct vfsmount * parent_mnt, const char *from)
{
__u32 needmode = GR_WRITE | GR_CREATE;
__u32 mode;
mode =
gr_check_create(new_dentry, parent_dentry, parent_mnt,
GR_CREATE | GR_AUDIT_CREATE |
GR_WRITE | GR_AUDIT_WRITE | GR_SUPPRESS);
if (unlikely(mode & GR_WRITE && mode & GR_AUDITS)) {
gr_log_fs_str_rbac(GR_DO_AUDIT, GR_SYMLINK_ACL_MSG, from, new_dentry, parent_mnt);
return mode;
} else if (unlikely(((mode & needmode) != needmode) && !(mode & GR_SUPPRESS))) {
gr_log_fs_str_rbac(GR_DONT_AUDIT, GR_SYMLINK_ACL_MSG, from, new_dentry, parent_mnt);
return 0;
} else if (unlikely((mode & needmode) != needmode))
return 0;
return (GR_WRITE | GR_CREATE);
}
