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670cb89bf4
(1) Permit userland applications to request a change of label atomic
with an execve() via mac_execve(). This is required for the
SEBSD port of SELinux/FLASK. Attempts to invoke this without
MAC compiled in result in ENOSYS, as with all other MAC system
calls. Complexity, if desired, is present in policy modules,
rather than the framework.
(2) Permit policies to have access to both the label of the vnode
being executed as well as the interpreter if it's a shell
script or related UNIX nonsense. Because we can't hold both
vnode locks at the same time, cache the interpreter label.
SEBSD relies on this because it supports secure transitioning
via shell script executables. Other policies might want to
take both labels into account during an integrity or
confidentiality decision at execve()-time.
Approved by: re
Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories
451 lines
20 KiB
C
451 lines
20 KiB
C
/*-
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* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
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* Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert Watson for the TrustedBSD Project.
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Kernel interface for MAC policy modules.
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*/
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#ifndef _SYS_MAC_POLICY_H
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#define _SYS_MAC_POLICY_H
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/*-
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* Pluggable access control policy definition structure.
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*
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* List of operations that are performed as part of the implementation
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* of a MAC policy. Policy implementors declare operations with a
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* mac_policy_ops structure, and using the MAC_POLICY_SET() macro.
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* If an entry point is not declared, then then the policy will be ignored
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* during evaluation of that event or check.
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*
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* Operations are sorted first by general class of operation, then
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* alphabetically.
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*/
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struct mac_policy_conf;
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struct mac_policy_ops {
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/*
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* Policy module operations.
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*/
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void (*mpo_destroy)(struct mac_policy_conf *mpc);
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void (*mpo_init)(struct mac_policy_conf *mpc);
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/*
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* General policy-directed security system call so that policies
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* may implement new services without reserving explicit
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* system call numbers.
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*/
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int (*mpo_syscall)(struct thread *td, int call, void *arg);
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/*
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* Label operations.
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*/
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void (*mpo_init_bpfdesc_label)(struct label *label);
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void (*mpo_init_cred_label)(struct label *label);
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void (*mpo_init_devfsdirent_label)(struct label *label);
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void (*mpo_init_ifnet_label)(struct label *label);
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void (*mpo_init_ipq_label)(struct label *label);
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int (*mpo_init_mbuf_label)(struct label *label, int flag);
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void (*mpo_init_mount_label)(struct label *label);
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void (*mpo_init_mount_fs_label)(struct label *label);
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int (*mpo_init_socket_label)(struct label *label, int flag);
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int (*mpo_init_socket_peer_label)(struct label *label, int flag);
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void (*mpo_init_pipe_label)(struct label *label);
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void (*mpo_init_vnode_label)(struct label *label);
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void (*mpo_destroy_bpfdesc_label)(struct label *label);
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void (*mpo_destroy_cred_label)(struct label *label);
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void (*mpo_destroy_devfsdirent_label)(struct label *label);
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void (*mpo_destroy_ifnet_label)(struct label *label);
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void (*mpo_destroy_ipq_label)(struct label *label);
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void (*mpo_destroy_mbuf_label)(struct label *label);
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void (*mpo_destroy_mount_label)(struct label *label);
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void (*mpo_destroy_mount_fs_label)(struct label *label);
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void (*mpo_destroy_socket_label)(struct label *label);
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void (*mpo_destroy_socket_peer_label)(struct label *label);
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void (*mpo_destroy_pipe_label)(struct label *label);
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void (*mpo_destroy_vnode_label)(struct label *label);
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void (*mpo_copy_pipe_label)(struct label *src,
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struct label *dest);
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void (*mpo_copy_vnode_label)(struct label *src,
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struct label *dest);
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int (*mpo_externalize_cred_label)(struct label *label,
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char *element_name, char *buffer, size_t buflen,
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size_t *len, int *claimed);
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int (*mpo_externalize_ifnet_label)(struct label *label,
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char *element_name, char *buffer, size_t buflen,
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size_t *len, int *claimed);
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int (*mpo_externalize_pipe_label)(struct label *label,
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char *element_name, char *buffer, size_t buflen,
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size_t *len, int *claimed);
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int (*mpo_externalize_socket_label)(struct label *label,
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char *element_name, char *buffer, size_t buflen,
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size_t *len, int *claimed);
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int (*mpo_externalize_socket_peer_label)(struct label *label,
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char *element_name, char *buffer, size_t buflen,
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size_t *len, int *claimed);
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int (*mpo_externalize_vnode_label)(struct label *label,
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char *element_name, char *buffer, size_t buflen,
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size_t *len, int *claimed);
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int (*mpo_internalize_cred_label)(struct label *label,
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char *element_name, char *element_data, int *claimed);
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int (*mpo_internalize_ifnet_label)(struct label *label,
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char *element_name, char *element_data, int *claimed);
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int (*mpo_internalize_pipe_label)(struct label *label,
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char *element_name, char *element_data, int *claimed);
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int (*mpo_internalize_socket_label)(struct label *label,
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char *element_name, char *element_data, int *claimed);
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int (*mpo_internalize_vnode_label)(struct label *label,
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char *element_name, char *element_data, int *claimed);
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/*
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* Labeling event operations: file system objects, and things that
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* look a lot like file system objects.
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*/
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void (*mpo_associate_vnode_devfs)(struct mount *mp,
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struct label *fslabel, struct devfs_dirent *de,
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struct label *delabel, struct vnode *vp,
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struct label *vlabel);
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int (*mpo_associate_vnode_extattr)(struct mount *mp,
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struct label *fslabel, struct vnode *vp,
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struct label *vlabel);
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void (*mpo_associate_vnode_singlelabel)(struct mount *mp,
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struct label *fslabel, struct vnode *vp,
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struct label *vlabel);
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void (*mpo_create_devfs_device)(dev_t dev, struct devfs_dirent *de,
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struct label *label);
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void (*mpo_create_devfs_directory)(char *dirname, int dirnamelen,
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struct devfs_dirent *de, struct label *label);
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void (*mpo_create_devfs_symlink)(struct ucred *cred,
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struct devfs_dirent *dd, struct label *ddlabel,
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struct devfs_dirent *de, struct label *delabel);
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void (*mpo_create_devfs_vnode)(struct devfs_dirent *de,
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struct label *direntlabel, struct vnode *vp,
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struct label *vnodelabel);
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int (*mpo_create_vnode_extattr)(struct ucred *cred,
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struct mount *mp, struct label *fslabel,
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struct vnode *dvp, struct label *dlabel,
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struct vnode *vp, struct label *vlabel,
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struct componentname *cnp);
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void (*mpo_create_mount)(struct ucred *cred, struct mount *mp,
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struct label *mntlabel, struct label *fslabel);
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void (*mpo_create_root_mount)(struct ucred *cred, struct mount *mp,
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struct label *mountlabel, struct label *fslabel);
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void (*mpo_relabel_vnode)(struct ucred *cred, struct vnode *vp,
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struct label *vnodelabel, struct label *label);
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int (*mpo_setlabel_vnode_extattr)(struct ucred *cred,
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struct vnode *vp, struct label *vlabel,
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struct label *intlabel);
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void (*mpo_update_devfsdirent)(struct devfs_dirent *devfs_dirent,
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struct label *direntlabel, struct vnode *vp,
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struct label *vnodelabel);
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/*
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* Labeling event operations: IPC objects.
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*/
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void (*mpo_create_mbuf_from_socket)(struct socket *so,
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struct label *socketlabel, struct mbuf *m,
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struct label *mbuflabel);
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void (*mpo_create_socket)(struct ucred *cred, struct socket *so,
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struct label *socketlabel);
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void (*mpo_create_socket_from_socket)(struct socket *oldsocket,
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struct label *oldsocketlabel, struct socket *newsocket,
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struct label *newsocketlabel);
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void (*mpo_relabel_socket)(struct ucred *cred, struct socket *so,
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struct label *oldlabel, struct label *newlabel);
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void (*mpo_relabel_pipe)(struct ucred *cred, struct pipe *pipe,
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struct label *oldlabel, struct label *newlabel);
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void (*mpo_set_socket_peer_from_mbuf)(struct mbuf *mbuf,
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struct label *mbuflabel, struct socket *so,
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struct label *socketpeerlabel);
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void (*mpo_set_socket_peer_from_socket)(struct socket *oldsocket,
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struct label *oldsocketlabel, struct socket *newsocket,
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struct label *newsocketpeerlabel);
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void (*mpo_create_pipe)(struct ucred *cred, struct pipe *pipe,
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struct label *pipelabel);
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/*
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* Labeling event operations: network objects.
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*/
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void (*mpo_create_bpfdesc)(struct ucred *cred, struct bpf_d *bpf_d,
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struct label *bpflabel);
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void (*mpo_create_ifnet)(struct ifnet *ifnet,
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struct label *ifnetlabel);
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void (*mpo_create_ipq)(struct mbuf *fragment,
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struct label *fragmentlabel, struct ipq *ipq,
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struct label *ipqlabel);
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void (*mpo_create_datagram_from_ipq)
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(struct ipq *ipq, struct label *ipqlabel,
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struct mbuf *datagram, struct label *datagramlabel);
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void (*mpo_create_fragment)(struct mbuf *datagram,
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struct label *datagramlabel, struct mbuf *fragment,
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struct label *fragmentlabel);
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void (*mpo_create_mbuf_from_mbuf)(struct mbuf *oldmbuf,
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struct label *oldlabel, struct mbuf *newmbuf,
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struct label *newlabel);
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void (*mpo_create_mbuf_linklayer)(struct ifnet *ifnet,
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struct label *ifnetlabel, struct mbuf *mbuf,
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struct label *mbuflabel);
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void (*mpo_create_mbuf_from_bpfdesc)(struct bpf_d *bpf_d,
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struct label *bpflabel, struct mbuf *mbuf,
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struct label *mbuflabel);
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void (*mpo_create_mbuf_from_ifnet)(struct ifnet *ifnet,
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struct label *ifnetlabel, struct mbuf *mbuf,
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struct label *mbuflabel);
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void (*mpo_create_mbuf_multicast_encap)(struct mbuf *oldmbuf,
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struct label *oldmbuflabel, struct ifnet *ifnet,
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struct label *ifnetlabel, struct mbuf *newmbuf,
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struct label *newmbuflabel);
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void (*mpo_create_mbuf_netlayer)(struct mbuf *oldmbuf,
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struct label *oldmbuflabel, struct mbuf *newmbuf,
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struct label *newmbuflabel);
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int (*mpo_fragment_match)(struct mbuf *fragment,
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struct label *fragmentlabel, struct ipq *ipq,
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struct label *ipqlabel);
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void (*mpo_relabel_ifnet)(struct ucred *cred, struct ifnet *ifnet,
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struct label *ifnetlabel, struct label *newlabel);
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void (*mpo_update_ipq)(struct mbuf *fragment,
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struct label *fragmentlabel, struct ipq *ipq,
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struct label *ipqlabel);
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/*
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* Labeling event operations: processes.
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*/
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void (*mpo_create_cred)(struct ucred *parent_cred,
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struct ucred *child_cred);
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void (*mpo_execve_transition)(struct ucred *old, struct ucred *new,
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struct vnode *vp, struct label *vnodelabel,
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struct label *interpvnodelabel,
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struct image_params *imgp);
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int (*mpo_execve_will_transition)(struct ucred *old,
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struct vnode *vp, struct label *vnodelabel,
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struct label *interpvnodelabel,
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struct image_params *imgp);
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void (*mpo_create_proc0)(struct ucred *cred);
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void (*mpo_create_proc1)(struct ucred *cred);
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void (*mpo_relabel_cred)(struct ucred *cred,
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struct label *newlabel);
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void (*mpo_thread_userret)(struct thread *thread);
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/*
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* Access control checks.
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*/
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int (*mpo_check_bpfdesc_receive)(struct bpf_d *bpf_d,
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struct label *bpflabel, struct ifnet *ifnet,
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struct label *ifnetlabel);
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int (*mpo_check_cred_relabel)(struct ucred *cred,
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struct label *newlabel);
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int (*mpo_check_cred_visible)(struct ucred *u1, struct ucred *u2);
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int (*mpo_check_ifnet_relabel)(struct ucred *cred,
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struct ifnet *ifnet, struct label *ifnetlabel,
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struct label *newlabel);
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int (*mpo_check_ifnet_transmit)(struct ifnet *ifnet,
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struct label *ifnetlabel, struct mbuf *m,
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struct label *mbuflabel);
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int (*mpo_check_kenv_dump)(struct ucred *cred);
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int (*mpo_check_kenv_get)(struct ucred *cred, char *name);
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int (*mpo_check_kenv_set)(struct ucred *cred, char *name,
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char *value);
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int (*mpo_check_kenv_unset)(struct ucred *cred, char *name);
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int (*mpo_check_mount_stat)(struct ucred *cred, struct mount *mp,
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struct label *mntlabel);
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int (*mpo_check_pipe_ioctl)(struct ucred *cred, struct pipe *pipe,
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struct label *pipelabel, unsigned long cmd, void *data);
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int (*mpo_check_pipe_poll)(struct ucred *cred, struct pipe *pipe,
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struct label *pipelabel);
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int (*mpo_check_pipe_read)(struct ucred *cred, struct pipe *pipe,
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struct label *pipelabel);
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int (*mpo_check_pipe_relabel)(struct ucred *cred,
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struct pipe *pipe, struct label *pipelabel,
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struct label *newlabel);
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int (*mpo_check_pipe_stat)(struct ucred *cred, struct pipe *pipe,
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struct label *pipelabel);
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int (*mpo_check_pipe_write)(struct ucred *cred, struct pipe *pipe,
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struct label *pipelabel);
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int (*mpo_check_proc_debug)(struct ucred *cred,
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struct proc *proc);
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int (*mpo_check_proc_sched)(struct ucred *cred,
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struct proc *proc);
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int (*mpo_check_proc_signal)(struct ucred *cred,
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struct proc *proc, int signum);
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int (*mpo_check_socket_bind)(struct ucred *cred,
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struct socket *so, struct label *socketlabel,
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struct sockaddr *sockaddr);
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int (*mpo_check_socket_connect)(struct ucred *cred,
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struct socket *so, struct label *socketlabel,
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struct sockaddr *sockaddr);
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int (*mpo_check_socket_deliver)(struct socket *so,
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struct label *socketlabel, struct mbuf *m,
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struct label *mbuflabel);
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int (*mpo_check_socket_listen)(struct ucred *cred,
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struct socket *so, struct label *socketlabel);
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int (*mpo_check_socket_receive)(struct ucred *cred,
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struct socket *so, struct label *socketlabel);
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int (*mpo_check_socket_relabel)(struct ucred *cred,
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struct socket *so, struct label *socketlabel,
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struct label *newlabel);
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int (*mpo_check_socket_send)(struct ucred *cred,
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struct socket *so, struct label *socketlabel);
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int (*mpo_check_socket_visible)(struct ucred *cred,
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struct socket *so, struct label *socketlabel);
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int (*mpo_check_system_acct)(struct ucred *cred,
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struct vnode *vp, struct label *vlabel);
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int (*mpo_check_system_nfsd)(struct ucred *cred);
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int (*mpo_check_system_reboot)(struct ucred *cred, int howto);
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int (*mpo_check_system_settime)(struct ucred *cred);
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int (*mpo_check_system_swapon)(struct ucred *cred,
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struct vnode *vp, struct label *label);
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int (*mpo_check_system_sysctl)(struct ucred *cred, int *name,
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u_int namelen, void *old, size_t *oldlenp, int inkernel,
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void *new, size_t newlen);
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int (*mpo_check_vnode_access)(struct ucred *cred,
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struct vnode *vp, struct label *label, int acc_mode);
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int (*mpo_check_vnode_chdir)(struct ucred *cred,
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struct vnode *dvp, struct label *dlabel);
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int (*mpo_check_vnode_chroot)(struct ucred *cred,
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struct vnode *dvp, struct label *dlabel);
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int (*mpo_check_vnode_create)(struct ucred *cred,
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struct vnode *dvp, struct label *dlabel,
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struct componentname *cnp, struct vattr *vap);
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int (*mpo_check_vnode_delete)(struct ucred *cred,
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struct vnode *dvp, struct label *dlabel,
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struct vnode *vp, struct label *label,
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struct componentname *cnp);
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int (*mpo_check_vnode_deleteacl)(struct ucred *cred,
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struct vnode *vp, struct label *label, acl_type_t type);
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int (*mpo_check_vnode_exec)(struct ucred *cred, struct vnode *vp,
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struct label *label, struct image_params *imgp);
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int (*mpo_check_vnode_getacl)(struct ucred *cred,
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struct vnode *vp, struct label *label, acl_type_t type);
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int (*mpo_check_vnode_getextattr)(struct ucred *cred,
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struct vnode *vp, struct label *label, int attrnamespace,
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const char *name, struct uio *uio);
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int (*mpo_check_vnode_link)(struct ucred *cred, struct vnode *dvp,
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struct label *dlabel, struct vnode *vp,
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struct label *label, struct componentname *cnp);
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int (*mpo_check_vnode_lookup)(struct ucred *cred,
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struct vnode *dvp, struct label *dlabel,
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struct componentname *cnp);
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int (*mpo_check_vnode_mmap)(struct ucred *cred, struct vnode *vp,
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struct label *label, int prot);
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void (*mpo_check_vnode_mmap_downgrade)(struct ucred *cred,
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struct vnode *vp, struct label *label, int *prot);
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int (*mpo_check_vnode_mprotect)(struct ucred *cred,
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struct vnode *vp, struct label *label, int prot);
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int (*mpo_check_vnode_open)(struct ucred *cred, struct vnode *vp,
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struct label *label, int acc_mode);
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int (*mpo_check_vnode_poll)(struct ucred *active_cred,
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struct ucred *file_cred, struct vnode *vp,
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struct label *label);
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int (*mpo_check_vnode_read)(struct ucred *active_cred,
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struct ucred *file_cred, struct vnode *vp,
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struct label *label);
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int (*mpo_check_vnode_readdir)(struct ucred *cred,
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struct vnode *dvp, struct label *dlabel);
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int (*mpo_check_vnode_readlink)(struct ucred *cred,
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struct vnode *vp, struct label *label);
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int (*mpo_check_vnode_relabel)(struct ucred *cred,
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struct vnode *vp, struct label *vnodelabel,
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|
struct label *newlabel);
|
|
int (*mpo_check_vnode_rename_from)(struct ucred *cred,
|
|
struct vnode *dvp, struct label *dlabel, struct vnode *vp,
|
|
struct label *label, struct componentname *cnp);
|
|
int (*mpo_check_vnode_rename_to)(struct ucred *cred,
|
|
struct vnode *dvp, struct label *dlabel, struct vnode *vp,
|
|
struct label *label, int samedir,
|
|
struct componentname *cnp);
|
|
int (*mpo_check_vnode_revoke)(struct ucred *cred,
|
|
struct vnode *vp, struct label *label);
|
|
int (*mpo_check_vnode_setacl)(struct ucred *cred,
|
|
struct vnode *vp, struct label *label, acl_type_t type,
|
|
struct acl *acl);
|
|
int (*mpo_check_vnode_setextattr)(struct ucred *cred,
|
|
struct vnode *vp, struct label *label, int attrnamespace,
|
|
const char *name, struct uio *uio);
|
|
int (*mpo_check_vnode_setflags)(struct ucred *cred,
|
|
struct vnode *vp, struct label *label, u_long flags);
|
|
int (*mpo_check_vnode_setmode)(struct ucred *cred,
|
|
struct vnode *vp, struct label *label, mode_t mode);
|
|
int (*mpo_check_vnode_setowner)(struct ucred *cred,
|
|
struct vnode *vp, struct label *label, uid_t uid,
|
|
gid_t gid);
|
|
int (*mpo_check_vnode_setutimes)(struct ucred *cred,
|
|
struct vnode *vp, struct label *label,
|
|
struct timespec atime, struct timespec mtime);
|
|
int (*mpo_check_vnode_stat)(struct ucred *active_cred,
|
|
struct ucred *file_cred, struct vnode *vp,
|
|
struct label *label);
|
|
int (*mpo_check_vnode_write)(struct ucred *active_cred,
|
|
struct ucred *file_cred, struct vnode *vp,
|
|
struct label *label);
|
|
};
|
|
|
|
struct mac_policy_conf {
|
|
char *mpc_name; /* policy name */
|
|
char *mpc_fullname; /* policy full name */
|
|
struct mac_policy_ops *mpc_ops; /* policy operations */
|
|
int mpc_loadtime_flags; /* flags */
|
|
int *mpc_field_off; /* security field */
|
|
int mpc_runtime_flags; /* flags */
|
|
LIST_ENTRY(mac_policy_conf) mpc_list; /* global list */
|
|
};
|
|
|
|
/* Flags for the mpc_loadtime_flags field. */
|
|
#define MPC_LOADTIME_FLAG_NOTLATE 0x00000001
|
|
#define MPC_LOADTIME_FLAG_UNLOADOK 0x00000002
|
|
|
|
/* Flags for the mpc_runtime_flags field. */
|
|
#define MPC_RUNTIME_FLAG_REGISTERED 0x00000001
|
|
|
|
#define MAC_POLICY_SET(mpops, mpname, mpfullname, mpflags, privdata_wanted) \
|
|
static struct mac_policy_conf mpname##_mac_policy_conf = { \
|
|
#mpname, \
|
|
mpfullname, \
|
|
mpops, \
|
|
mpflags, \
|
|
privdata_wanted, \
|
|
0, \
|
|
}; \
|
|
static moduledata_t mpname##_mod = { \
|
|
#mpname, \
|
|
mac_policy_modevent, \
|
|
&mpname##_mac_policy_conf \
|
|
}; \
|
|
MODULE_DEPEND(mpname, kernel_mac_support, 1, 1, 1); \
|
|
DECLARE_MODULE(mpname, mpname##_mod, SI_SUB_MAC_POLICY, \
|
|
SI_ORDER_MIDDLE)
|
|
|
|
int mac_policy_modevent(module_t mod, int type, void *data);
|
|
|
|
#define LABEL_TO_SLOT(l, s) (l)->l_perpolicy[s]
|
|
|
|
#endif /* !_SYS_MAC_POLICY_H */
|