diff options
Diffstat (limited to 'sys/security/mac_biba/mac_biba.c')
| -rw-r--r-- | sys/security/mac_biba/mac_biba.c | 2226 |
1 files changed, 2226 insertions, 0 deletions
diff --git a/sys/security/mac_biba/mac_biba.c b/sys/security/mac_biba/mac_biba.c new file mode 100644 index 000000000000..a7620b3654a9 --- /dev/null +++ b/sys/security/mac_biba/mac_biba.c @@ -0,0 +1,2226 @@ +/*- + * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson + * Copyright (c) 2001, 2002 Networks Associates Technology, Inc. + * All rights reserved. + * + * This software was developed by Robert Watson for the TrustedBSD Project. + * + * This software was developed for the FreeBSD Project in part by NAI Labs, + * the Security Research Division of Network Associates, Inc. under + * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA + * CHATS research program. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The names of the authors may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * Developed by the TrustedBSD Project. + * Biba fixed label mandatory integrity policy. + */ + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/acl.h> +#include <sys/conf.h> +#include <sys/kernel.h> +#include <sys/mac.h> +#include <sys/mount.h> +#include <sys/proc.h> +#include <sys/systm.h> +#include <sys/sysproto.h> +#include <sys/sysent.h> +#include <sys/vnode.h> +#include <sys/file.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/pipe.h> +#include <sys/sysctl.h> + +#include <fs/devfs/devfs.h> + +#include <net/bpfdesc.h> +#include <net/if.h> +#include <net/if_types.h> +#include <net/if_var.h> + +#include <netinet/in.h> +#include <netinet/ip_var.h> + +#include <vm/vm.h> + +#include <sys/mac_policy.h> + +#include <security/mac_biba/mac_biba.h> + +SYSCTL_DECL(_security_mac); + +SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0, + "TrustedBSD mac_biba policy controls"); + +static int mac_biba_enabled = 0; +SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, + &mac_biba_enabled, 0, "Enforce MAC/Biba policy"); + +static int destroyed_not_inited; +SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD, + &destroyed_not_inited, 0, "Count of labels destroyed but not inited"); + +static int trust_all_interfaces = 0; +SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD, + &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); +TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces); + +static char trusted_interfaces[128]; +SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD, + trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); +TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces, + sizeof(trusted_interfaces)); + +static int mac_biba_revocation_enabled = 0; +SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW, + &mac_biba_revocation_enabled, 0, "Revoke access to objects on relabel"); +TUNABLE_INT("security.mac.biba.revocation_enabled", + &mac_biba_revocation_enabled); + +static int mac_biba_slot; +#define SLOT(l) ((struct mac_biba *)LABEL_TO_SLOT((l), mac_biba_slot).l_ptr) + +MALLOC_DEFINE(M_MACBIBA, "biba label", "MAC/Biba labels"); + +static int mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, mode_t acc_mode); + +static struct mac_biba * +biba_alloc(int how) +{ + struct mac_biba *mac_biba; + + mac_biba = malloc(sizeof(struct mac_biba), M_MACBIBA, M_ZERO | how); + + return (mac_biba); +} + +static void +biba_free(struct mac_biba *mac_biba) +{ + + if (mac_biba != NULL) + free(mac_biba, M_MACBIBA); + else + atomic_add_int(&destroyed_not_inited, 1); +} + +static int +mac_biba_dominate_element(struct mac_biba_element *a, + struct mac_biba_element *b) +{ + + switch(a->mbe_type) { + case MAC_BIBA_TYPE_EQUAL: + case MAC_BIBA_TYPE_HIGH: + return (1); + + case MAC_BIBA_TYPE_LOW: + switch (b->mbe_type) { + case MAC_BIBA_TYPE_GRADE: + case MAC_BIBA_TYPE_HIGH: + return (0); + + case MAC_BIBA_TYPE_EQUAL: + case MAC_BIBA_TYPE_LOW: + return (1); + + default: + panic("mac_biba_dominate_element: b->mbe_type invalid"); + } + + case MAC_BIBA_TYPE_GRADE: + switch (b->mbe_type) { + case MAC_BIBA_TYPE_EQUAL: + case MAC_BIBA_TYPE_LOW: + return (1); + + case MAC_BIBA_TYPE_HIGH: + return (0); + + case MAC_BIBA_TYPE_GRADE: + return (a->mbe_grade >= b->mbe_grade); + + default: + panic("mac_biba_dominate_element: b->mbe_type invalid"); + } + + default: + panic("mac_biba_dominate_element: a->mbe_type invalid"); + } + + return (0); +} + +static int +mac_biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb) +{ + + return (mac_biba_dominate_element(&rangeb->mb_rangehigh, + &rangea->mb_rangehigh) && + mac_biba_dominate_element(&rangea->mb_rangelow, + &rangeb->mb_rangelow)); +} + +static int +mac_biba_single_in_range(struct mac_biba *single, struct mac_biba *range) +{ + + KASSERT((single->mb_flag & MAC_BIBA_FLAG_SINGLE) != 0, + ("mac_biba_single_in_range: a not single")); + KASSERT((range->mb_flag & MAC_BIBA_FLAG_RANGE) != 0, + ("mac_biba_single_in_range: b not range")); + + return (mac_biba_dominate_element(&range->mb_rangehigh, + &single->mb_single) && + mac_biba_dominate_element(&single->mb_single, + &range->mb_rangelow)); + + return (1); +} + +static int +mac_biba_dominate_single(struct mac_biba *a, struct mac_biba *b) +{ + KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, + ("mac_biba_dominate_single: a not single")); + KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, + ("mac_biba_dominate_single: b not single")); + + return (mac_biba_dominate_element(&a->mb_single, &b->mb_single)); +} + +static int +mac_biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b) +{ + + if (a->mbe_type == MAC_BIBA_TYPE_EQUAL || + b->mbe_type == MAC_BIBA_TYPE_EQUAL) + return (1); + + return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade); +} + +static int +mac_biba_equal_range(struct mac_biba *a, struct mac_biba *b) +{ + + KASSERT((a->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, + ("mac_biba_equal_range: a not range")); + KASSERT((b->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, + ("mac_biba_equal_range: b not range")); + + return (mac_biba_equal_element(&a->mb_rangelow, &b->mb_rangelow) && + mac_biba_equal_element(&a->mb_rangehigh, &b->mb_rangehigh)); +} + +static int +mac_biba_equal_single(struct mac_biba *a, struct mac_biba *b) +{ + + KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, + ("mac_biba_equal_single: a not single")); + KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, + ("mac_biba_equal_single: b not single")); + + return (mac_biba_equal_element(&a->mb_single, &b->mb_single)); +} + +static int +mac_biba_high_single(struct mac_biba *mac_biba) +{ + + return (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_HIGH); +} + +static int +mac_biba_valid(struct mac_biba *mac_biba) +{ + + if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) { + switch (mac_biba->mb_single.mbe_type) { + case MAC_BIBA_TYPE_GRADE: + break; + + case MAC_BIBA_TYPE_EQUAL: + case MAC_BIBA_TYPE_HIGH: + case MAC_BIBA_TYPE_LOW: + if (mac_biba->mb_single.mbe_grade != 0) + return (EINVAL); + break; + + default: + return (EINVAL); + } + } else { + if (mac_biba->mb_single.mbe_type != MAC_BIBA_TYPE_UNDEF) + return (EINVAL); + } + + if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) { + switch (mac_biba->mb_rangelow.mbe_type) { + case MAC_BIBA_TYPE_GRADE: + break; + + case MAC_BIBA_TYPE_EQUAL: + case MAC_BIBA_TYPE_HIGH: + case MAC_BIBA_TYPE_LOW: + if (mac_biba->mb_rangelow.mbe_grade != 0) + return (EINVAL); + break; + + default: + return (EINVAL); + } + + switch (mac_biba->mb_rangehigh.mbe_type) { + case MAC_BIBA_TYPE_GRADE: + break; + + case MAC_BIBA_TYPE_EQUAL: + case MAC_BIBA_TYPE_HIGH: + case MAC_BIBA_TYPE_LOW: + if (mac_biba->mb_rangehigh.mbe_grade != 0) + return (EINVAL); + break; + + default: + return (EINVAL); + } + if (!mac_biba_dominate_element(&mac_biba->mb_rangehigh, + &mac_biba->mb_rangelow)) + return (EINVAL); + } else { + if (mac_biba->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF || + mac_biba->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF) + return (EINVAL); + } + + return (0); +} + +static void +mac_biba_set_range(struct mac_biba *mac_biba, u_short typelow, + u_short gradelow, u_short typehigh, u_short gradehigh) +{ + + mac_biba->mb_rangelow.mbe_type = typelow; + mac_biba->mb_rangelow.mbe_grade = gradelow; + mac_biba->mb_rangehigh.mbe_type = typehigh; + mac_biba->mb_rangehigh.mbe_grade = gradehigh; + mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE; +} + +static void +mac_biba_set_single(struct mac_biba *mac_biba, u_short type, u_short grade) +{ + + mac_biba->mb_single.mbe_type = type; + mac_biba->mb_single.mbe_grade = grade; + mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE; +} + +static void +mac_biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto) +{ + KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, + ("mac_biba_copy_range: labelfrom not range")); + + labelto->mb_rangelow = labelfrom->mb_rangelow; + labelto->mb_rangehigh = labelfrom->mb_rangehigh; + labelto->mb_flags |= MAC_BIBA_FLAG_RANGE; +} + +static void +mac_biba_copy_single(struct mac_biba *labelfrom, struct mac_biba *labelto) +{ + + KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, + ("mac_biba_copy_single: labelfrom not single")); + + labelto->mb_single = labelfrom->mb_single; + labelto->mb_flags |= MAC_BIBA_FLAG_SINGLE; +} + +static void +mac_biba_copy_single_to_range(struct mac_biba *labelfrom, + struct mac_biba *labelto) +{ + + KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0, + ("mac_biba_copy_single_to_range: labelfrom not single")); + + labelto->mb_rangelow = labelfrom->mb_single; + labelto->mb_rangehigh = labelfrom->mb_single; + labelto->mb_flags |= MAC_BIBA_FLAG_RANGE; +} + +/* + * Policy module operations. + */ +static void +mac_biba_destroy(struct mac_policy_conf *conf) +{ + +} + +static void +mac_biba_init(struct mac_policy_conf *conf) +{ + +} + +/* + * Label operations. + */ +static void +mac_biba_init_bpfdesc(struct bpf_d *bpf_d, struct label *label) +{ + + SLOT(label) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_init_cred(struct ucred *ucred, struct label *label) +{ + + SLOT(label) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_init_devfsdirent(struct devfs_dirent *devfs_dirent, + struct label *label) +{ + + SLOT(label) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_init_ifnet(struct ifnet *ifnet, struct label *label) +{ + + SLOT(label) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_init_ipq(struct ipq *ipq, struct label *label) +{ + + SLOT(label) = biba_alloc(M_WAITOK); +} + +static int +mac_biba_init_mbuf(struct mbuf *mbuf, int how, struct label *label) +{ + + SLOT(label) = biba_alloc(how); + if (SLOT(label) == NULL) + return (ENOMEM); + + return (0); +} + +static void +mac_biba_init_mount(struct mount *mount, struct label *mntlabel, + struct label *fslabel) +{ + + SLOT(mntlabel) = biba_alloc(M_WAITOK); + SLOT(fslabel) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_init_socket(struct socket *socket, struct label *label, + struct label *peerlabel) +{ + + SLOT(label) = biba_alloc(M_WAITOK); + SLOT(peerlabel) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_init_pipe(struct pipe *pipe, struct label *label) +{ + + SLOT(label) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_init_temp(struct label *label) +{ + + SLOT(label) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_init_vnode(struct vnode *vp, struct label *label) +{ + + SLOT(label) = biba_alloc(M_WAITOK); +} + +static void +mac_biba_destroy_bpfdesc(struct bpf_d *bpf_d, struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static void +mac_biba_destroy_cred(struct ucred *ucred, struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static void +mac_biba_destroy_devfsdirent(struct devfs_dirent *devfs_dirent, + struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static void +mac_biba_destroy_ifnet(struct ifnet *ifnet, struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static void +mac_biba_destroy_ipq(struct ipq *ipq, struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static void +mac_biba_destroy_mbuf(struct mbuf *mbuf, struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static void +mac_biba_destroy_mount(struct mount *mount, struct label *mntlabel, + struct label *fslabel) +{ + + biba_free(SLOT(mntlabel)); + SLOT(mntlabel) = NULL; + biba_free(SLOT(fslabel)); + SLOT(fslabel) = NULL; +} + +static void +mac_biba_destroy_socket(struct socket *socket, struct label *label, + struct label *peerlabel) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; + biba_free(SLOT(peerlabel)); + SLOT(peerlabel) = NULL; +} + +static void +mac_biba_destroy_pipe(struct pipe *pipe, struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static void +mac_biba_destroy_temp(struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static void +mac_biba_destroy_vnode(struct vnode *vp, struct label *label) +{ + + biba_free(SLOT(label)); + SLOT(label) = NULL; +} + +static int +mac_biba_externalize(struct label *label, struct mac *extmac) +{ + struct mac_biba *mac_biba; + + mac_biba = SLOT(label); + + if (mac_biba == NULL) { + printf("mac_biba_externalize: NULL pointer\n"); + return (0); + } + + extmac->m_biba = *mac_biba; + + return (0); +} + +static int +mac_biba_internalize(struct label *label, struct mac *extmac) +{ + struct mac_biba *mac_biba; + int error; + + mac_biba = SLOT(label); + + error = mac_biba_valid(mac_biba); + if (error) + return (error); + + *mac_biba = extmac->m_biba; + + return (0); +} + +/* + * Labeling event operations: file system objects, and things that look + * a lot like file system objects. + */ +static void +mac_biba_create_devfs_device(dev_t dev, struct devfs_dirent *devfs_dirent, + struct label *label) +{ + struct mac_biba *mac_biba; + int biba_type; + + mac_biba = SLOT(label); + if (strcmp(dev->si_name, "null") == 0 || + strcmp(dev->si_name, "zero") == 0 || + strcmp(dev->si_name, "random") == 0 || + strncmp(dev->si_name, "fd/", strlen("fd/")) == 0) + biba_type = MAC_BIBA_TYPE_EQUAL; + else + biba_type = MAC_BIBA_TYPE_HIGH; + mac_biba_set_single(mac_biba, biba_type, 0); +} + +static void +mac_biba_create_devfs_directory(char *dirname, int dirnamelen, + struct devfs_dirent *devfs_dirent, struct label *label) +{ + struct mac_biba *mac_biba; + + mac_biba = SLOT(label); + mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0); +} + +static void +mac_biba_create_devfs_vnode(struct devfs_dirent *devfs_dirent, + struct label *direntlabel, struct vnode *vp, struct label *vnodelabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(direntlabel); + dest = SLOT(vnodelabel); + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_vnode(struct ucred *cred, struct vnode *parent, + struct label *parentlabel, struct vnode *child, struct label *childlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(&cred->cr_label); + dest = SLOT(childlabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_mount(struct ucred *cred, struct mount *mp, + struct label *mntlabel, struct label *fslabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(&cred->cr_label); + dest = SLOT(mntlabel); + mac_biba_copy_single(source, dest); + dest = SLOT(fslabel); + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_root_mount(struct ucred *cred, struct mount *mp, + struct label *mntlabel, struct label *fslabel) +{ + struct mac_biba *mac_biba; + + /* Always mount root as high integrity. */ + mac_biba = SLOT(fslabel); + mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0); + mac_biba = SLOT(mntlabel); + mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0); +} + +static void +mac_biba_relabel_vnode(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, struct label *label) +{ + struct mac_biba *source, *dest; + + source = SLOT(label); + dest = SLOT(vnodelabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_update_devfsdirent(struct devfs_dirent *devfs_dirent, + struct label *direntlabel, struct vnode *vp, struct label *vnodelabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(vnodelabel); + dest = SLOT(direntlabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_update_procfsvnode(struct vnode *vp, struct label *vnodelabel, + struct ucred *cred) +{ + struct mac_biba *source, *dest; + + source = SLOT(&cred->cr_label); + dest = SLOT(vnodelabel); + + /* + * Only copy the single, not the range, since vnodes only have + * a single. + */ + mac_biba_copy_single(source, dest); +} + +static int +mac_biba_update_vnode_from_externalized(struct vnode *vp, + struct label *vnodelabel, struct mac *extmac) +{ + struct mac_biba *source, *dest; + int error; + + source = &extmac->m_biba; + dest = SLOT(vnodelabel); + + error = mac_biba_valid(source); + if (error) + return (error); + + if ((source->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) + return (EINVAL); + + mac_biba_copy_single(source, dest); + + return (0); +} + +static void +mac_biba_update_vnode_from_mount(struct vnode *vp, struct label *vnodelabel, + struct mount *mp, struct label *fslabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(fslabel); + dest = SLOT(vnodelabel); + + mac_biba_copy_single(source, dest); +} + +/* + * Labeling event operations: IPC object. + */ +static void +mac_biba_create_mbuf_from_socket(struct socket *so, struct label *socketlabel, + struct mbuf *m, struct label *mbuflabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(socketlabel); + dest = SLOT(mbuflabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_socket(struct ucred *cred, struct socket *socket, + struct label *socketlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(&cred->cr_label); + dest = SLOT(socketlabel); + + mac_biba_copy_single(source, dest); + mac_biba_copy_single_to_range(source, dest); +} + +static void +mac_biba_create_pipe(struct ucred *cred, struct pipe *pipe, + struct label *pipelabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(&cred->cr_label); + dest = SLOT(pipelabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_socket_from_socket(struct socket *oldsocket, + struct label *oldsocketlabel, struct socket *newsocket, + struct label *newsocketlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(oldsocketlabel); + dest = SLOT(newsocketlabel); + + mac_biba_copy_single(source, dest); + mac_biba_copy_range(source, dest); +} + +static void +mac_biba_relabel_socket(struct ucred *cred, struct socket *socket, + struct label *socketlabel, struct label *newlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(newlabel); + dest = SLOT(socketlabel); + + mac_biba_copy_single(source, dest); + mac_biba_copy_range(source, dest); +} + +static void +mac_biba_relabel_pipe(struct ucred *cred, struct pipe *pipe, + struct label *pipelabel, struct label *newlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(newlabel); + dest = SLOT(pipelabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel, + struct socket *socket, struct label *socketpeerlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(mbuflabel); + dest = SLOT(socketpeerlabel); + + mac_biba_copy_single(source, dest); +} + +/* + * Labeling event operations: network objects. + */ +static void +mac_biba_set_socket_peer_from_socket(struct socket *oldsocket, + struct label *oldsocketlabel, struct socket *newsocket, + struct label *newsocketpeerlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(oldsocketlabel); + dest = SLOT(newsocketpeerlabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d, + struct label *bpflabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(&cred->cr_label); + dest = SLOT(bpflabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel) +{ + char tifname[IFNAMSIZ], ifname[IFNAMSIZ], *p, *q; + char tiflist[sizeof(trusted_interfaces)]; + struct mac_biba *dest; + int len, grade; + + dest = SLOT(ifnetlabel); + + if (ifnet->if_type == IFT_LOOP) { + grade = MAC_BIBA_TYPE_EQUAL; + goto set; + } + + if (trust_all_interfaces) { + grade = MAC_BIBA_TYPE_HIGH; + goto set; + } + + grade = MAC_BIBA_TYPE_LOW; + + if (trusted_interfaces[0] == '\0' || + !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) + goto set; + + for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) + if(*p != ' ' && *p != '\t') + *q = *p; + + snprintf(ifname, IFNAMSIZ, "%s%d", ifnet->if_name, ifnet->if_unit); + + for (p = q = tiflist;; p++) { + if (*p == ',' || *p == '\0') { + len = p - q; + if (len < IFNAMSIZ) { + bzero(tifname, sizeof(tifname)); + bcopy(q, tifname, len); + if (strcmp(tifname, ifname) == 0) { + grade = MAC_BIBA_TYPE_HIGH; + break; + } + } + if (*p == '\0') + break; + q = p + 1; + } + } +set: + mac_biba_set_single(dest, grade, 0); + mac_biba_set_range(dest, grade, 0, grade, 0); +} + +static void +mac_biba_create_ipq(struct mbuf *fragment, struct label *fragmentlabel, + struct ipq *ipq, struct label *ipqlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(fragmentlabel); + dest = SLOT(ipqlabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel, + struct mbuf *datagram, struct label *datagramlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(ipqlabel); + dest = SLOT(datagramlabel); + + /* Just use the head, since we require them all to match. */ + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_fragment(struct mbuf *datagram, struct label *datagramlabel, + struct mbuf *fragment, struct label *fragmentlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(datagramlabel); + dest = SLOT(fragmentlabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_mbuf_from_mbuf(struct mbuf *oldmbuf, + struct label *oldmbuflabel, struct mbuf *newmbuf, + struct label *newmbuflabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(oldmbuflabel); + dest = SLOT(newmbuflabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel, + struct mbuf *mbuf, struct label *mbuflabel) +{ + struct mac_biba *dest; + + dest = SLOT(mbuflabel); + + mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0); +} + +static void +mac_biba_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel, + struct mbuf *mbuf, struct label *mbuflabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(bpflabel); + dest = SLOT(mbuflabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel, + struct mbuf *m, struct label *mbuflabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(ifnetlabel); + dest = SLOT(mbuflabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_mbuf_multicast_encap(struct mbuf *oldmbuf, + struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel, + struct mbuf *newmbuf, struct label *newmbuflabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(oldmbuflabel); + dest = SLOT(newmbuflabel); + + mac_biba_copy_single(source, dest); +} + +static void +mac_biba_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel, + struct mbuf *newmbuf, struct label *newmbuflabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(oldmbuflabel); + dest = SLOT(newmbuflabel); + + mac_biba_copy_single(source, dest); +} + +static int +mac_biba_fragment_match(struct mbuf *fragment, struct label *fragmentlabel, + struct ipq *ipq, struct label *ipqlabel) +{ + struct mac_biba *a, *b; + + a = SLOT(ipqlabel); + b = SLOT(fragmentlabel); + + return (mac_biba_equal_single(a, b)); +} + +static void +mac_biba_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet, + struct label *ifnetlabel, struct label *newlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(newlabel); + dest = SLOT(ifnetlabel); + + mac_biba_copy_single(source, dest); + mac_biba_copy_range(source, dest); +} + +static void +mac_biba_update_ipq(struct mbuf *fragment, struct label *fragmentlabel, + struct ipq *ipq, struct label *ipqlabel) +{ + + /* NOOP: we only accept matching labels, so no need to update */ +} + +/* + * Labeling event operations: processes. + */ +static void +mac_biba_create_cred(struct ucred *cred_parent, struct ucred *cred_child) +{ + struct mac_biba *source, *dest; + + source = SLOT(&cred_parent->cr_label); + dest = SLOT(&cred_child->cr_label); + + mac_biba_copy_single(source, dest); + mac_biba_copy_range(source, dest); +} + +static void +mac_biba_execve_transition(struct ucred *old, struct ucred *new, + struct vnode *vp, struct mac *vnodelabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(&old->cr_label); + dest = SLOT(&new->cr_label); + + mac_biba_copy_single(source, dest); + mac_biba_copy_range(source, dest); +} + +static int +mac_biba_execve_will_transition(struct ucred *old, struct vnode *vp, + struct mac *vnodelabel) +{ + + return (0); +} + +static void +mac_biba_create_proc0(struct ucred *cred) +{ + struct mac_biba *dest; + + dest = SLOT(&cred->cr_label); + + mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0); + mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, MAC_BIBA_TYPE_HIGH, 0); +} + +static void +mac_biba_create_proc1(struct ucred *cred) +{ + struct mac_biba *dest; + + dest = SLOT(&cred->cr_label); + + mac_biba_set_single(dest, MAC_BIBA_TYPE_HIGH, 0); + mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, MAC_BIBA_TYPE_HIGH, 0); +} + +static void +mac_biba_relabel_cred(struct ucred *cred, struct label *newlabel) +{ + struct mac_biba *source, *dest; + + source = SLOT(newlabel); + dest = SLOT(&cred->cr_label); + + mac_biba_copy_single(source, dest); + mac_biba_copy_range(source, dest); +} + +/* + * Access control checks. + */ +static int +mac_biba_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel, + struct ifnet *ifnet, struct label *ifnetlabel) +{ + struct mac_biba *a, *b; + + if (!mac_biba_enabled) + return (0); + + a = SLOT(bpflabel); + b = SLOT(ifnetlabel); + + if (mac_biba_equal_single(a, b)) + return (0); + return (EACCES); +} + +static int +mac_biba_check_cred_relabel(struct ucred *cred, struct label *newlabel) +{ + struct mac_biba *subj, *new; + + subj = SLOT(&cred->cr_label); + new = SLOT(newlabel); + + if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAGS_BOTH) + return (EINVAL); + + /* + * XXX: Allow processes with root privilege to set labels outside + * their range, so suid things like "su" work. This WILL go away + * when we figure out the 'correct' solution... + */ + if (!suser_cred(cred, 0)) + return (0); + + /* + * The new single must be in the old range. + */ + if (!mac_biba_single_in_range(new, subj)) + return (EPERM); + + /* + * The new range must be in the old range. + */ + if (!mac_biba_range_in_range(new, subj)) + return (EPERM); + + /* + * XXX: Don't permit EQUAL in a label unless the subject has EQUAL. + */ + + return (0); +} + +static int +mac_biba_check_cred_visible(struct ucred *u1, struct ucred *u2) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&u1->cr_label); + obj = SLOT(&u2->cr_label); + + /* XXX: range */ + if (!mac_biba_dominate_single(obj, subj)) + return (ESRCH); + + return (0); +} + +static int +mac_biba_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet, + struct label *ifnetlabel, struct label *newlabel) +{ + struct mac_biba *subj, *new; + + subj = SLOT(&cred->cr_label); + new = SLOT(newlabel); + + if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAGS_BOTH) + return (EINVAL); + + /* + * XXX: Only Biba HIGH subjects may relabel interfaces. */ + if (!mac_biba_high_single(subj)) + return (EPERM); + + return (suser_cred(cred, 0)); +} + +static int +mac_biba_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel, + struct mbuf *m, struct label *mbuflabel) +{ + struct mac_biba *p, *i; + + if (!mac_biba_enabled) + return (0); + + p = SLOT(mbuflabel); + i = SLOT(ifnetlabel); + + return (mac_biba_single_in_range(p, i) ? 0 : EACCES); +} + +static int +mac_biba_check_mount_stat(struct ucred *cred, struct mount *mp, + struct label *mntlabel) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(mntlabel); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, + struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data) +{ + + if(!mac_biba_enabled) + return (0); + + /* XXX: This will be implemented soon... */ + + return (0); +} + +static int +mac_biba_check_pipe_op(struct ucred *cred, struct pipe *pipe, + struct label *pipelabel, int op) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT((pipelabel)); + + switch(op) { + case MAC_OP_PIPE_READ: + case MAC_OP_PIPE_STAT: + case MAC_OP_PIPE_POLL: + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + break; + case MAC_OP_PIPE_WRITE: + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + break; + default: + panic("mac_biba_check_pipe_op: invalid pipe operation"); + } + + return (0); +} + +static int +mac_biba_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, + struct label *pipelabel, struct label *newlabel) +{ + struct mac_biba *subj, *obj, *new; + + new = SLOT(newlabel); + subj = SLOT(&cred->cr_label); + obj = SLOT(pipelabel); + + if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) + return (EINVAL); + + /* + * To relabel a pipe, the old pipe label must be in the subject + * range. + */ + if (!mac_biba_single_in_range(obj, subj)) + return (EPERM); + + /* + * To relabel a pipe, the new pipe label must be in the subject + * range. + */ + if (!mac_biba_single_in_range(new, subj)) + return (EPERM); + + /* + * XXX: Don't permit EQUAL in a label unless the subject has EQUAL. + */ + + return (0); +} + +static int +mac_biba_check_proc_debug(struct ucred *cred, struct proc *proc) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(&proc->p_ucred->cr_label); + + /* XXX: range checks */ + if (!mac_biba_dominate_single(obj, subj)) + return (ESRCH); + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_proc_sched(struct ucred *cred, struct proc *proc) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(&proc->p_ucred->cr_label); + + /* XXX: range checks */ + if (!mac_biba_dominate_single(obj, subj)) + return (ESRCH); + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(&proc->p_ucred->cr_label); + + /* XXX: range checks */ + if (!mac_biba_dominate_single(obj, subj)) + return (ESRCH); + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_socket_receive(struct socket *so, struct label *socketlabel, + struct mbuf *m, struct label *mbuflabel) +{ + struct mac_biba *p, *s; + + if (!mac_biba_enabled) + return (0); + + p = SLOT(mbuflabel); + s = SLOT(socketlabel); + + return (mac_biba_equal_single(p, s) ? 0 : EACCES); +} + +static int +mac_biba_check_socket_relabel(struct ucred *cred, struct socket *socket, + struct label *socketlabel, struct label *newlabel) +{ + struct mac_biba *subj, *obj, *new; + + new = SLOT(newlabel); + subj = SLOT(&cred->cr_label); + obj = SLOT(socketlabel); + + if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) + return (EINVAL); + + /* + * To relabel a socket, the old socket label must be in the subject + * range. + */ + if (!mac_biba_single_in_range(obj, subj)) + return (EPERM); + + /* + * To relabel a socket, the new socket label must be in the subject + * range. + */ + if (!mac_biba_single_in_range(new, subj)) + return (EPERM); + + /* + * XXX: Don't permit EQUAL in a label unless the subject has EQUAL. + */ + + return (0); +} + +static int +mac_biba_check_socket_visible(struct ucred *cred, struct socket *socket, + struct label *socketlabel) +{ + struct mac_biba *subj, *obj; + + subj = SLOT(&cred->cr_label); + obj = SLOT(socketlabel); + + if (!mac_biba_dominate_single(obj, subj)) + return (ENOENT); + + return (0); +} + +static int +mac_biba_check_vnode_access(struct ucred *cred, struct vnode *vp, + struct label *label, mode_t flags) +{ + + return (mac_biba_check_vnode_open(cred, vp, label, flags)); +} + +static int +mac_biba_check_vnode_chdir(struct ucred *cred, struct vnode *dvp, + struct label *dlabel) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(dlabel); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_chroot(struct ucred *cred, struct vnode *dvp, + struct label *dlabel) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(dlabel); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_create(struct ucred *cred, struct vnode *dvp, + struct label *dlabel, struct componentname *cnp, struct vattr *vap) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(dlabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_delete(struct ucred *cred, struct vnode *dvp, + struct label *dlabel, struct vnode *vp, struct label *label, + struct componentname *cnp) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(dlabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + obj = SLOT(label); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, + struct label *label, acl_type_t type) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_exec(struct ucred *cred, struct vnode *vp, + struct label *label) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_getacl(struct ucred *cred, struct vnode *vp, + struct label *label, acl_type_t type) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, + struct label *label, int attrnamespace, const char *name, struct uio *uio) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, + struct label *dlabel, struct componentname *cnp) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(dlabel); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, mode_t acc_mode) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(vnodelabel); + + /* XXX privilege override for admin? */ + if (acc_mode & (VREAD | VEXEC | VSTAT)) { + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + } + if (acc_mode & (VWRITE | VAPPEND | VADMIN)) { + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + } + + return (0); +} + +static int +mac_biba_check_vnode_readdir(struct ucred *cred, struct vnode *dvp, + struct label *dlabel) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(dlabel); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_readlink(struct ucred *cred, struct vnode *vp, + struct label *label) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_relabel(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, struct label *newlabel) +{ + struct mac_biba *old, *new, *subj; + + old = SLOT(vnodelabel); + new = SLOT(newlabel); + subj = SLOT(&cred->cr_label); + + if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) + return (EINVAL); + + /* + * To relabel a vnode, the old vnode label must be in the subject + * range. + */ + if (!mac_biba_single_in_range(old, subj)) + return (EPERM); + + /* + * To relabel a vnode, the new vnode label must be in the subject + * range. + */ + if (!mac_biba_single_in_range(new, subj)) + return (EPERM); + + /* + * XXX: Don't permit EQUAL in a label unless the subject has EQUAL. + */ + + return (suser_cred(cred, 0)); +} + +static int +mac_biba_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, + struct label *dlabel, struct vnode *vp, struct label *label, + struct componentname *cnp) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(dlabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + obj = SLOT(label); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, + struct label *dlabel, struct vnode *vp, struct label *label, int samedir, + struct componentname *cnp) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(dlabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + if (vp != NULL) { + obj = SLOT(label); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + } + + return (0); +} + +static int +mac_biba_check_vnode_revoke(struct ucred *cred, struct vnode *vp, + struct label *label) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_setacl(struct ucred *cred, struct vnode *vp, + struct label *label, acl_type_t type, struct acl *acl) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, int attrnamespace, const char *name, + struct uio *uio) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(vnodelabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + /* XXX: protect the MAC EA in a special way? */ + + return (0); +} + +static int +mac_biba_check_vnode_setflags(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, u_long flags) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(vnodelabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_setmode(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, mode_t mode) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(vnodelabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_setowner(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, uid_t uid, gid_t gid) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(vnodelabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel, struct timespec atime, struct timespec mtime) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(vnodelabel); + + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + + return (0); +} + +static int +mac_biba_check_vnode_stat(struct ucred *cred, struct vnode *vp, + struct label *vnodelabel) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(vnodelabel); + + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + + return (0); +} + +static vm_prot_t +mac_biba_check_vnode_mmap_perms(struct ucred *cred, struct vnode *vp, + struct label *label, int newmapping) +{ + struct mac_biba *subj, *obj; + vm_prot_t prot = 0; + + if (!mac_biba_enabled || (!mac_biba_revocation_enabled && !newmapping)) + return (VM_PROT_ALL); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + if (mac_biba_dominate_single(obj, subj)) + prot |= VM_PROT_READ | VM_PROT_EXECUTE; + if (mac_biba_dominate_single(subj, obj)) + prot |= VM_PROT_WRITE; + return (prot); +} + +static int +mac_biba_check_vnode_op(struct ucred *cred, struct vnode *vp, + struct label *label, int op) +{ + struct mac_biba *subj, *obj; + + if (!mac_biba_enabled || !mac_biba_revocation_enabled) + return (0); + + subj = SLOT(&cred->cr_label); + obj = SLOT(label); + + switch (op) { + case MAC_OP_VNODE_POLL: + case MAC_OP_VNODE_READ: + if (!mac_biba_dominate_single(obj, subj)) + return (EACCES); + return (0); + + case MAC_OP_VNODE_WRITE: + if (!mac_biba_dominate_single(subj, obj)) + return (EACCES); + return (0); + + default: + printf("mac_biba_check_vnode_op: unknown operation %d\n", op); + return (EINVAL); + } +} + +static struct mac_policy_op_entry mac_biba_ops[] = +{ + { MAC_DESTROY, + (macop_t)mac_biba_destroy }, + { MAC_INIT, + (macop_t)mac_biba_init }, + { MAC_INIT_BPFDESC, + (macop_t)mac_biba_init_bpfdesc }, + { MAC_INIT_CRED, + (macop_t)mac_biba_init_cred }, + { MAC_INIT_DEVFSDIRENT, + (macop_t)mac_biba_init_devfsdirent }, + { MAC_INIT_IFNET, + (macop_t)mac_biba_init_ifnet }, + { MAC_INIT_IPQ, + (macop_t)mac_biba_init_ipq }, + { MAC_INIT_MBUF, + (macop_t)mac_biba_init_mbuf }, + { MAC_INIT_MOUNT, + (macop_t)mac_biba_init_mount }, + { MAC_INIT_PIPE, + (macop_t)mac_biba_init_pipe }, + { MAC_INIT_SOCKET, + (macop_t)mac_biba_init_socket }, + { MAC_INIT_TEMP, + (macop_t)mac_biba_init_temp }, + { MAC_INIT_VNODE, + (macop_t)mac_biba_init_vnode }, + { MAC_DESTROY_BPFDESC, + (macop_t)mac_biba_destroy_bpfdesc }, + { MAC_DESTROY_CRED, + (macop_t)mac_biba_destroy_cred }, + { MAC_DESTROY_DEVFSDIRENT, + (macop_t)mac_biba_destroy_devfsdirent }, + { MAC_DESTROY_IFNET, + (macop_t)mac_biba_destroy_ifnet }, + { MAC_DESTROY_IPQ, + (macop_t)mac_biba_destroy_ipq }, + { MAC_DESTROY_MBUF, + (macop_t)mac_biba_destroy_mbuf }, + { MAC_DESTROY_MOUNT, + (macop_t)mac_biba_destroy_mount }, + { MAC_DESTROY_PIPE, + (macop_t)mac_biba_destroy_pipe }, + { MAC_DESTROY_SOCKET, + (macop_t)mac_biba_destroy_socket }, + { MAC_DESTROY_TEMP, + (macop_t)mac_biba_destroy_temp }, + { MAC_DESTROY_VNODE, + (macop_t)mac_biba_destroy_vnode }, + { MAC_EXTERNALIZE, + (macop_t)mac_biba_externalize }, + { MAC_INTERNALIZE, + (macop_t)mac_biba_internalize }, + { MAC_CREATE_DEVFS_DEVICE, + (macop_t)mac_biba_create_devfs_device }, + { MAC_CREATE_DEVFS_DIRECTORY, + (macop_t)mac_biba_create_devfs_directory }, + { MAC_CREATE_DEVFS_VNODE, + (macop_t)mac_biba_create_devfs_vnode }, + { MAC_CREATE_VNODE, + (macop_t)mac_biba_create_vnode }, + { MAC_CREATE_MOUNT, + (macop_t)mac_biba_create_mount }, + { MAC_CREATE_ROOT_MOUNT, + (macop_t)mac_biba_create_root_mount }, + { MAC_RELABEL_VNODE, + (macop_t)mac_biba_relabel_vnode }, + { MAC_UPDATE_DEVFSDIRENT, + (macop_t)mac_biba_update_devfsdirent }, + { MAC_UPDATE_PROCFSVNODE, + (macop_t)mac_biba_update_procfsvnode }, + { MAC_UPDATE_VNODE_FROM_EXTERNALIZED, + (macop_t)mac_biba_update_vnode_from_externalized }, + { MAC_UPDATE_VNODE_FROM_MOUNT, + (macop_t)mac_biba_update_vnode_from_mount }, + { MAC_CREATE_MBUF_FROM_SOCKET, + (macop_t)mac_biba_create_mbuf_from_socket }, + { MAC_CREATE_PIPE, + (macop_t)mac_biba_create_pipe }, + { MAC_CREATE_SOCKET, + (macop_t)mac_biba_create_socket }, + { MAC_CREATE_SOCKET_FROM_SOCKET, + (macop_t)mac_biba_create_socket_from_socket }, + { MAC_RELABEL_PIPE, + (macop_t)mac_biba_relabel_pipe }, + { MAC_RELABEL_SOCKET, + (macop_t)mac_biba_relabel_socket }, + { MAC_SET_SOCKET_PEER_FROM_MBUF, + (macop_t)mac_biba_set_socket_peer_from_mbuf }, + { MAC_SET_SOCKET_PEER_FROM_SOCKET, + (macop_t)mac_biba_set_socket_peer_from_socket }, + { MAC_CREATE_BPFDESC, + (macop_t)mac_biba_create_bpfdesc }, + { MAC_CREATE_DATAGRAM_FROM_IPQ, + (macop_t)mac_biba_create_datagram_from_ipq }, + { MAC_CREATE_FRAGMENT, + (macop_t)mac_biba_create_fragment }, + { MAC_CREATE_IFNET, + (macop_t)mac_biba_create_ifnet }, + { MAC_CREATE_IPQ, + (macop_t)mac_biba_create_ipq }, + { MAC_CREATE_MBUF_FROM_MBUF, + (macop_t)mac_biba_create_mbuf_from_mbuf }, + { MAC_CREATE_MBUF_LINKLAYER, + (macop_t)mac_biba_create_mbuf_linklayer }, + { MAC_CREATE_MBUF_FROM_BPFDESC, + (macop_t)mac_biba_create_mbuf_from_bpfdesc }, + { MAC_CREATE_MBUF_FROM_IFNET, + (macop_t)mac_biba_create_mbuf_from_ifnet }, + { MAC_CREATE_MBUF_MULTICAST_ENCAP, + (macop_t)mac_biba_create_mbuf_multicast_encap }, + { MAC_CREATE_MBUF_NETLAYER, + (macop_t)mac_biba_create_mbuf_netlayer }, + { MAC_FRAGMENT_MATCH, + (macop_t)mac_biba_fragment_match }, + { MAC_RELABEL_IFNET, + (macop_t)mac_biba_relabel_ifnet }, + { MAC_UPDATE_IPQ, + (macop_t)mac_biba_update_ipq }, + { MAC_CREATE_CRED, + (macop_t)mac_biba_create_cred }, + { MAC_EXECVE_TRANSITION, + (macop_t)mac_biba_execve_transition }, + { MAC_EXECVE_WILL_TRANSITION, + (macop_t)mac_biba_execve_will_transition }, + { MAC_CREATE_PROC0, + (macop_t)mac_biba_create_proc0 }, + { MAC_CREATE_PROC1, + (macop_t)mac_biba_create_proc1 }, + { MAC_RELABEL_CRED, + (macop_t)mac_biba_relabel_cred }, + { MAC_CHECK_BPFDESC_RECEIVE, + (macop_t)mac_biba_check_bpfdesc_receive }, + { MAC_CHECK_CRED_RELABEL, + (macop_t)mac_biba_check_cred_relabel }, + { MAC_CHECK_CRED_VISIBLE, + (macop_t)mac_biba_check_cred_visible }, + { MAC_CHECK_IFNET_RELABEL, + (macop_t)mac_biba_check_ifnet_relabel }, + { MAC_CHECK_IFNET_TRANSMIT, + (macop_t)mac_biba_check_ifnet_transmit }, + { MAC_CHECK_MOUNT_STAT, + (macop_t)mac_biba_check_mount_stat }, + { MAC_CHECK_PIPE_IOCTL, + (macop_t)mac_biba_check_pipe_ioctl }, + { MAC_CHECK_PIPE_OP, + (macop_t)mac_biba_check_pipe_op }, + { MAC_CHECK_PIPE_RELABEL, + (macop_t)mac_biba_check_pipe_relabel }, + { MAC_CHECK_PROC_DEBUG, + (macop_t)mac_biba_check_proc_debug }, + { MAC_CHECK_PROC_SCHED, + (macop_t)mac_biba_check_proc_sched }, + { MAC_CHECK_PROC_SIGNAL, + (macop_t)mac_biba_check_proc_signal }, + { MAC_CHECK_SOCKET_RECEIVE, + (macop_t)mac_biba_check_socket_receive }, + { MAC_CHECK_SOCKET_RELABEL, + (macop_t)mac_biba_check_socket_relabel }, + { MAC_CHECK_SOCKET_VISIBLE, + (macop_t)mac_biba_check_socket_visible }, + { MAC_CHECK_VNODE_ACCESS, + (macop_t)mac_biba_check_vnode_access }, + { MAC_CHECK_VNODE_CHDIR, + (macop_t)mac_biba_check_vnode_chdir }, + { MAC_CHECK_VNODE_CHROOT, + (macop_t)mac_biba_check_vnode_chroot }, + { MAC_CHECK_VNODE_CREATE, + (macop_t)mac_biba_check_vnode_create }, + { MAC_CHECK_VNODE_DELETE, + (macop_t)mac_biba_check_vnode_delete }, + { MAC_CHECK_VNODE_DELETEACL, + (macop_t)mac_biba_check_vnode_deleteacl }, + { MAC_CHECK_VNODE_EXEC, + (macop_t)mac_biba_check_vnode_exec }, + { MAC_CHECK_VNODE_GETACL, + (macop_t)mac_biba_check_vnode_getacl }, + { MAC_CHECK_VNODE_GETEXTATTR, + (macop_t)mac_biba_check_vnode_getextattr }, + { MAC_CHECK_VNODE_LOOKUP, + (macop_t)mac_biba_check_vnode_lookup }, + { MAC_CHECK_VNODE_OPEN, + (macop_t)mac_biba_check_vnode_open }, + { MAC_CHECK_VNODE_READDIR, + (macop_t)mac_biba_check_vnode_readdir }, + { MAC_CHECK_VNODE_READLINK, + (macop_t)mac_biba_check_vnode_readlink }, + { MAC_CHECK_VNODE_RELABEL, + (macop_t)mac_biba_check_vnode_relabel }, + { MAC_CHECK_VNODE_RENAME_FROM, + (macop_t)mac_biba_check_vnode_rename_from }, + { MAC_CHECK_VNODE_RENAME_TO, + (macop_t)mac_biba_check_vnode_rename_to }, + { MAC_CHECK_VNODE_REVOKE, + (macop_t)mac_biba_check_vnode_revoke }, + { MAC_CHECK_VNODE_SETACL, + (macop_t)mac_biba_check_vnode_setacl }, + { MAC_CHECK_VNODE_SETEXTATTR, + (macop_t)mac_biba_check_vnode_setextattr }, + { MAC_CHECK_VNODE_SETFLAGS, + (macop_t)mac_biba_check_vnode_setflags }, + { MAC_CHECK_VNODE_SETMODE, + (macop_t)mac_biba_check_vnode_setmode }, + { MAC_CHECK_VNODE_SETOWNER, + (macop_t)mac_biba_check_vnode_setowner }, + { MAC_CHECK_VNODE_SETUTIMES, + (macop_t)mac_biba_check_vnode_setutimes }, + { MAC_CHECK_VNODE_STAT, + (macop_t)mac_biba_check_vnode_stat }, + { MAC_CHECK_VNODE_MMAP_PERMS, + (macop_t)mac_biba_check_vnode_mmap_perms }, + { MAC_CHECK_VNODE_OP, + (macop_t)mac_biba_check_vnode_op }, + { MAC_OP_LAST, NULL } +}; + +MAC_POLICY_SET(mac_biba_ops, trustedbsd_mac_biba, "TrustedBSD MAC/Biba", + MPC_LOADTIME_FLAG_NOTLATE, &mac_biba_slot); |