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mac_lomac.c
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mac_lomac.h
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Editing: mac_lomac.c
/*- * Copyright (c) 1999-2002, 2007-2009 Robert N. M. Watson * Copyright (c) 2001-2005 Networks Associates Technology, Inc. * Copyright (c) 2006 SPARTA, 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. * * This software was enhanced by SPARTA ISSO under SPAWAR contract * N66001-04-C-6019 ("SEFOS"). * * 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. * * 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. * * Low-watermark floating label mandatory integrity policy. */ #include <sys/types.h> #include <sys/param.h> #include <sys/acl.h> #include <sys/conf.h> #include <sys/extattr.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/mman.h> #include <sys/mount.h> #include <sys/priv.h> #include <sys/proc.h> #include <sys/sbuf.h> #include <sys/systm.h> #include <sys/sysproto.h> #include <sys/sysent.h> #include <sys/systm.h> #include <sys/vnode.h> #include <sys/file.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/sx.h> #include <sys/pipe.h> #include <sys/sysctl.h> #include <sys/syslog.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/in_pcb.h> #include <netinet/ip_var.h> #include <vm/vm.h> #include <security/mac/mac_policy.h> #include <security/mac/mac_framework.h> #include <security/mac_lomac/mac_lomac.h> struct mac_lomac_proc { struct mac_lomac mac_lomac; struct mtx mtx; }; SYSCTL_DECL(_security_mac); static SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "TrustedBSD mac_lomac policy controls"); static int lomac_label_size = sizeof(struct mac_lomac); SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD, &lomac_label_size, 0, "Size of struct mac_lomac"); static int lomac_enabled = 1; SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RWTUN, &lomac_enabled, 0, "Enforce MAC/LOMAC policy"); static int destroyed_not_inited; SYSCTL_INT(_security_mac_lomac, 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_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RDTUN, &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC"); static char trusted_interfaces[128]; SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RDTUN, trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC"); static int ptys_equal = 0; SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RWTUN, &ptys_equal, 0, "Label pty devices as lomac/equal on create"); static int revocation_enabled = 1; SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN, &revocation_enabled, 0, "Revoke access to objects on relabel"); static int lomac_slot; #define SLOT(l) ((struct mac_lomac *)mac_label_get((l), lomac_slot)) #define SLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val)) #define PSLOT(l) ((struct mac_lomac_proc *) \ mac_label_get((l), lomac_slot)) #define PSLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val)) static MALLOC_DEFINE(M_LOMAC, "mac_lomac_label", "MAC/LOMAC labels"); static struct mac_lomac * lomac_alloc(int flag) { struct mac_lomac *ml; ml = malloc(sizeof(*ml), M_LOMAC, M_ZERO | flag); return (ml); } static void lomac_free(struct mac_lomac *ml) { if (ml != NULL) free(ml, M_LOMAC); else atomic_add_int(&destroyed_not_inited, 1); } static int lomac_atmostflags(struct mac_lomac *ml, int flags) { if ((ml->ml_flags & flags) != ml->ml_flags) return (EINVAL); return (0); } static int lomac_dominate_element(struct mac_lomac_element *a, struct mac_lomac_element *b) { switch (a->mle_type) { case MAC_LOMAC_TYPE_EQUAL: case MAC_LOMAC_TYPE_HIGH: return (1); case MAC_LOMAC_TYPE_LOW: switch (b->mle_type) { case MAC_LOMAC_TYPE_GRADE: case MAC_LOMAC_TYPE_HIGH: return (0); case MAC_LOMAC_TYPE_EQUAL: case MAC_LOMAC_TYPE_LOW: return (1); default: panic("lomac_dominate_element: b->mle_type invalid"); } case MAC_LOMAC_TYPE_GRADE: switch (b->mle_type) { case MAC_LOMAC_TYPE_EQUAL: case MAC_LOMAC_TYPE_LOW: return (1); case MAC_LOMAC_TYPE_HIGH: return (0); case MAC_LOMAC_TYPE_GRADE: return (a->mle_grade >= b->mle_grade); default: panic("lomac_dominate_element: b->mle_type invalid"); } default: panic("lomac_dominate_element: a->mle_type invalid"); } } static int lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb) { return (lomac_dominate_element(&rangeb->ml_rangehigh, &rangea->ml_rangehigh) && lomac_dominate_element(&rangea->ml_rangelow, &rangeb->ml_rangelow)); } static int lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range) { KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, ("lomac_single_in_range: a not single")); KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, ("lomac_single_in_range: b not range")); return (lomac_dominate_element(&range->ml_rangehigh, &single->ml_single) && lomac_dominate_element(&single->ml_single, &range->ml_rangelow)); } static int lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range) { KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0, ("lomac_single_in_range: a not auxsingle")); KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, ("lomac_single_in_range: b not range")); return (lomac_dominate_element(&range->ml_rangehigh, &single->ml_auxsingle) && lomac_dominate_element(&single->ml_auxsingle, &range->ml_rangelow)); } static int lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b) { KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, ("lomac_dominate_single: a not single")); KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, ("lomac_dominate_single: b not single")); return (lomac_dominate_element(&a->ml_single, &b->ml_single)); } static int lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b) { KASSERT((~a->ml_flags & (MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0, ("lomac_dominate_single: a not subject")); KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, ("lomac_dominate_single: b not single")); return (lomac_dominate_element(&a->ml_rangehigh, &b->ml_single)); } static int lomac_equal_element(struct mac_lomac_element *a, struct mac_lomac_element *b) { if (a->mle_type == MAC_LOMAC_TYPE_EQUAL || b->mle_type == MAC_LOMAC_TYPE_EQUAL) return (1); return (a->mle_type == b->mle_type && a->mle_grade == b->mle_grade); } static int lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b) { KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, ("lomac_equal_single: a not single")); KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, ("lomac_equal_single: b not single")); return (lomac_equal_element(&a->ml_single, &b->ml_single)); } static int lomac_contains_equal(struct mac_lomac *ml) { if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL) return (1); if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) if (ml->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL) return (1); if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL) return (1); if (ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL) return (1); } return (0); } static int lomac_subject_privileged(struct mac_lomac *ml) { KASSERT((ml->ml_flags & MAC_LOMAC_FLAGS_BOTH) == MAC_LOMAC_FLAGS_BOTH, ("lomac_subject_privileged: subject doesn't have both labels")); /* If the single is EQUAL, it's ok. */ if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL) return (0); /* If either range endpoint is EQUAL, it's ok. */ if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL || ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL) return (0); /* If the range is low-high, it's ok. */ if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW && ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH) return (0); /* It's not ok. */ return (EPERM); } static int lomac_high_single(struct mac_lomac *ml) { KASSERT((ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, ("lomac_high_single: mac_lomac not single")); return (ml->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH); } static int lomac_valid(struct mac_lomac *ml) { if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) { switch (ml->ml_single.mle_type) { case MAC_LOMAC_TYPE_GRADE: case MAC_LOMAC_TYPE_EQUAL: case MAC_LOMAC_TYPE_HIGH: case MAC_LOMAC_TYPE_LOW: break; default: return (EINVAL); } } else { if (ml->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF) return (EINVAL); } if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) { switch (ml->ml_auxsingle.mle_type) { case MAC_LOMAC_TYPE_GRADE: case MAC_LOMAC_TYPE_EQUAL: case MAC_LOMAC_TYPE_HIGH: case MAC_LOMAC_TYPE_LOW: break; default: return (EINVAL); } } else { if (ml->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF) return (EINVAL); } if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { switch (ml->ml_rangelow.mle_type) { case MAC_LOMAC_TYPE_GRADE: case MAC_LOMAC_TYPE_EQUAL: case MAC_LOMAC_TYPE_HIGH: case MAC_LOMAC_TYPE_LOW: break; default: return (EINVAL); } switch (ml->ml_rangehigh.mle_type) { case MAC_LOMAC_TYPE_GRADE: case MAC_LOMAC_TYPE_EQUAL: case MAC_LOMAC_TYPE_HIGH: case MAC_LOMAC_TYPE_LOW: break; default: return (EINVAL); } if (!lomac_dominate_element(&ml->ml_rangehigh, &ml->ml_rangelow)) return (EINVAL); } else { if (ml->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF || ml->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF) return (EINVAL); } return (0); } static void lomac_set_range(struct mac_lomac *ml, u_short typelow, u_short gradelow, u_short typehigh, u_short gradehigh) { ml->ml_rangelow.mle_type = typelow; ml->ml_rangelow.mle_grade = gradelow; ml->ml_rangehigh.mle_type = typehigh; ml->ml_rangehigh.mle_grade = gradehigh; ml->ml_flags |= MAC_LOMAC_FLAG_RANGE; } static void lomac_set_single(struct mac_lomac *ml, u_short type, u_short grade) { ml->ml_single.mle_type = type; ml->ml_single.mle_grade = grade; ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE; } static void lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto) { KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0, ("lomac_copy_range: labelfrom not range")); labelto->ml_rangelow = labelfrom->ml_rangelow; labelto->ml_rangehigh = labelfrom->ml_rangehigh; labelto->ml_flags |= MAC_LOMAC_FLAG_RANGE; } static void lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto) { KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0, ("lomac_copy_single: labelfrom not single")); labelto->ml_single = labelfrom->ml_single; labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE; } static void lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto) { KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0, ("lomac_copy_auxsingle: labelfrom not auxsingle")); labelto->ml_auxsingle = labelfrom->ml_auxsingle; labelto->ml_flags |= MAC_LOMAC_FLAG_AUX; } static void lomac_copy(struct mac_lomac *source, struct mac_lomac *dest) { if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE) lomac_copy_single(source, dest); if (source->ml_flags & MAC_LOMAC_FLAG_AUX) lomac_copy_auxsingle(source, dest); if (source->ml_flags & MAC_LOMAC_FLAG_RANGE) lomac_copy_range(source, dest); } static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml); static int maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel, const char *actionname, const char *objname, struct vnode *vp) { struct sbuf subjlabel_sb, subjtext_sb, objlabel_sb; char *subjlabeltext, *objlabeltext, *subjtext; struct mac_lomac cached_subjlabel; struct mac_lomac_proc *subj; struct vattr va; struct proc *p; pid_t pgid; subj = PSLOT(curthread->td_proc->p_label); p = curthread->td_proc; mtx_lock(&subj->mtx); if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) { /* * Check to see if the pending demotion would be more or less * severe than this one, and keep the more severe. This can * only happen for a multi-threaded application. */ if (lomac_dominate_single(objlabel, &subj->mac_lomac)) { mtx_unlock(&subj->mtx); return (0); } } bzero(&subj->mac_lomac, sizeof(subj->mac_lomac)); /* * Always demote the single label. */ lomac_copy_single(objlabel, &subj->mac_lomac); /* * Start with the original range, then minimize each side of the * range to the point of not dominating the object. The high side * will always be demoted, of course. */ lomac_copy_range(subjlabel, &subj->mac_lomac); if (!lomac_dominate_element(&objlabel->ml_single, &subj->mac_lomac.ml_rangelow)) subj->mac_lomac.ml_rangelow = objlabel->ml_single; subj->mac_lomac.ml_rangehigh = objlabel->ml_single; subj->mac_lomac.ml_flags |= MAC_LOMAC_FLAG_UPDATE; thread_lock(curthread); curthread->td_flags |= TDF_ASTPENDING | TDF_MACPEND; thread_unlock(curthread); /* * Avoid memory allocation while holding a mutex; cache the label. */ lomac_copy_single(&subj->mac_lomac, &cached_subjlabel); mtx_unlock(&subj->mtx); sbuf_new(&subjlabel_sb, NULL, 0, SBUF_AUTOEXTEND); lomac_to_string(&subjlabel_sb, subjlabel); sbuf_finish(&subjlabel_sb); subjlabeltext = sbuf_data(&subjlabel_sb); sbuf_new(&subjtext_sb, NULL, 0, SBUF_AUTOEXTEND); lomac_to_string(&subjtext_sb, &subj->mac_lomac); sbuf_finish(&subjtext_sb); subjtext = sbuf_data(&subjtext_sb); sbuf_new(&objlabel_sb, NULL, 0, SBUF_AUTOEXTEND); lomac_to_string(&objlabel_sb, objlabel); sbuf_finish(&objlabel_sb); objlabeltext = sbuf_data(&objlabel_sb); pgid = p->p_pgrp->pg_id; /* XXX could be stale? */ if (vp != NULL && VOP_GETATTR(vp, &va, curthread->td_ucred) == 0) { log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to" " level %s after %s a level-%s %s (inode=%ju, " "mountpount=%s)\n", subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid, p->p_comm, subjtext, actionname, objlabeltext, objname, (uintmax_t)va.va_fileid, vp->v_mount->mnt_stat.f_mntonname); } else { log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to" " level %s after %s a level-%s %s\n", subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid, p->p_comm, subjtext, actionname, objlabeltext, objname); } sbuf_delete(&subjlabel_sb); sbuf_delete(&subjtext_sb); sbuf_delete(&objlabel_sb); return (0); } /* * Relabel "to" to "from" only if "from" is a valid label (contains at least * a single), as for a relabel operation which may or may not involve a * relevant label. */ static void try_relabel(struct mac_lomac *from, struct mac_lomac *to) { if (from->ml_flags & MAC_LOMAC_FLAG_SINGLE) { bzero(to, sizeof(*to)); lomac_copy(from, to); } } /* * Policy module operations. */ static void lomac_init(struct mac_policy_conf *conf) { } /* * Label operations. */ static void lomac_init_label(struct label *label) { SLOT_SET(label, lomac_alloc(M_WAITOK)); } static int lomac_init_label_waitcheck(struct label *label, int flag) { SLOT_SET(label, lomac_alloc(flag)); if (SLOT(label) == NULL) return (ENOMEM); return (0); } static void lomac_destroy_label(struct label *label) { lomac_free(SLOT(label)); SLOT_SET(label, NULL); } static int lomac_element_to_string(struct sbuf *sb, struct mac_lomac_element *element) { switch (element->mle_type) { case MAC_LOMAC_TYPE_HIGH: return (sbuf_printf(sb, "high")); case MAC_LOMAC_TYPE_LOW: return (sbuf_printf(sb, "low")); case MAC_LOMAC_TYPE_EQUAL: return (sbuf_printf(sb, "equal")); case MAC_LOMAC_TYPE_GRADE: return (sbuf_printf(sb, "%d", element->mle_grade)); default: panic("lomac_element_to_string: invalid type (%d)", element->mle_type); } } static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml) { if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) { if (lomac_element_to_string(sb, &ml->ml_single) == -1) return (EINVAL); } if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) { if (sbuf_putc(sb, '[') == -1) return (EINVAL); if (lomac_element_to_string(sb, &ml->ml_auxsingle) == -1) return (EINVAL); if (sbuf_putc(sb, ']') == -1) return (EINVAL); } if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) { if (sbuf_putc(sb, '(') == -1) return (EINVAL); if (lomac_element_to_string(sb, &ml->ml_rangelow) == -1) return (EINVAL); if (sbuf_putc(sb, '-') == -1) return (EINVAL); if (lomac_element_to_string(sb, &ml->ml_rangehigh) == -1) return (EINVAL); if (sbuf_putc(sb, ')') == -1) return (EINVAL); } return (0); } static int lomac_externalize_label(struct label *label, char *element_name, struct sbuf *sb, int *claimed) { struct mac_lomac *ml; if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0) return (0); (*claimed)++; ml = SLOT(label); return (lomac_to_string(sb, ml)); } static int lomac_parse_element(struct mac_lomac_element *element, char *string) { if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) { element->mle_type = MAC_LOMAC_TYPE_HIGH; element->mle_grade = MAC_LOMAC_TYPE_UNDEF; } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) { element->mle_type = MAC_LOMAC_TYPE_LOW; element->mle_grade = MAC_LOMAC_TYPE_UNDEF; } else if (strcmp(string, "equal") == 0 || strcmp(string, "eq") == 0) { element->mle_type = MAC_LOMAC_TYPE_EQUAL; element->mle_grade = MAC_LOMAC_TYPE_UNDEF; } else { char *p0, *p1; int d; p0 = string; d = strtol(p0, &p1, 10); if (d < 0 || d > 65535) return (EINVAL); element->mle_type = MAC_LOMAC_TYPE_GRADE; element->mle_grade = d; if (p1 == p0 || *p1 != '\0') return (EINVAL); } return (0); } /* * Note: destructively consumes the string, make a local copy before calling * if that's a problem. */ static int lomac_parse(struct mac_lomac *ml, char *string) { char *range, *rangeend, *rangehigh, *rangelow, *single, *auxsingle, *auxsingleend; int error; /* Do we have a range? */ single = string; range = strchr(string, '('); if (range == single) single = NULL; auxsingle = strchr(string, '['); if (auxsingle == single) single = NULL; if (range != NULL && auxsingle != NULL) return (EINVAL); rangelow = rangehigh = NULL; if (range != NULL) { /* Nul terminate the end of the single string. */ *range = '\0'; range++; rangelow = range; rangehigh = strchr(rangelow, '-'); if (rangehigh == NULL) return (EINVAL); rangehigh++; if (*rangelow == '\0' || *rangehigh == '\0') return (EINVAL); rangeend = strchr(rangehigh, ')'); if (rangeend == NULL) return (EINVAL); if (*(rangeend + 1) != '\0') return (EINVAL); /* Nul terminate the ends of the ranges. */ *(rangehigh - 1) = '\0'; *rangeend = '\0'; } KASSERT((rangelow != NULL && rangehigh != NULL) || (rangelow == NULL && rangehigh == NULL), ("lomac_internalize_label: range mismatch")); if (auxsingle != NULL) { /* Nul terminate the end of the single string. */ *auxsingle = '\0'; auxsingle++; auxsingleend = strchr(auxsingle, ']'); if (auxsingleend == NULL) return (EINVAL); if (*(auxsingleend + 1) != '\0') return (EINVAL); /* Nul terminate the end of the auxsingle. */ *auxsingleend = '\0'; } bzero(ml, sizeof(*ml)); if (single != NULL) { error = lomac_parse_element(&ml->ml_single, single); if (error) return (error); ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE; } if (auxsingle != NULL) { error = lomac_parse_element(&ml->ml_auxsingle, auxsingle); if (error) return (error); ml->ml_flags |= MAC_LOMAC_FLAG_AUX; } if (rangelow != NULL) { error = lomac_parse_element(&ml->ml_rangelow, rangelow); if (error) return (error); error = lomac_parse_element(&ml->ml_rangehigh, rangehigh); if (error) return (error); ml->ml_flags |= MAC_LOMAC_FLAG_RANGE; } error = lomac_valid(ml); if (error) return (error); return (0); } static int lomac_internalize_label(struct label *label, char *element_name, char *element_data, int *claimed) { struct mac_lomac *ml, ml_temp; int error; if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0) return (0); (*claimed)++; error = lomac_parse(&ml_temp, element_data); if (error) return (error); ml = SLOT(label); *ml = ml_temp; return (0); } static void lomac_copy_label(struct label *src, struct label *dest) { *SLOT(dest) = *SLOT(src); } /* * Object-specific entry point implementations are sorted alphabetically by * object type name and then by operation. */ static int lomac_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, struct ifnet *ifp, struct label *ifplabel) { struct mac_lomac *a, *b; if (!lomac_enabled) return (0); a = SLOT(dlabel); b = SLOT(ifplabel); if (lomac_equal_single(a, b)) return (0); return (EACCES); } static void lomac_bpfdesc_create(struct ucred *cred, struct bpf_d *d, struct label *dlabel) { struct mac_lomac *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(dlabel); lomac_copy_single(source, dest); } static void lomac_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *source, *dest; source = SLOT(dlabel); dest = SLOT(mlabel); lomac_copy_single(source, dest); } static int lomac_cred_check_relabel(struct ucred *cred, struct label *newlabel) { struct mac_lomac *subj, *new; int error; subj = SLOT(cred->cr_label); new = SLOT(newlabel); /* * If there is a LOMAC label update for the credential, it may be an * update of the single, range, or both. */ error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH); if (error) return (error); /* * If the LOMAC label is to be changed, authorize as appropriate. */ if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) { /* * Fill in the missing parts from the previous label. */ if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) lomac_copy_single(subj, new); if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0) lomac_copy_range(subj, new); /* * To change the LOMAC range on a credential, the new range * label must be in the current range. */ if (!lomac_range_in_range(new, subj)) return (EPERM); /* * To change the LOMAC single label on a credential, the new * single label must be in the new range. Implicitly from * the previous check, the new single is in the old range. */ if (!lomac_single_in_range(new, new)) return (EPERM); /* * To have EQUAL in any component of the new credential LOMAC * label, the subject must already have EQUAL in their label. */ if (lomac_contains_equal(new)) { error = lomac_subject_privileged(subj); if (error) return (error); } /* * XXXMAC: Additional consistency tests regarding the single * and range of the new label might be performed here. */ } return (0); } static int lomac_cred_check_visible(struct ucred *cr1, struct ucred *cr2) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cr1->cr_label); obj = SLOT(cr2->cr_label); /* XXX: range */ if (!lomac_dominate_single(obj, subj)) return (ESRCH); return (0); } static void lomac_cred_create_init(struct ucred *cred) { struct mac_lomac *dest; dest = SLOT(cred->cr_label); lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0); lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0); } static void lomac_cred_create_swapper(struct ucred *cred) { struct mac_lomac *dest; dest = SLOT(cred->cr_label); lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0); } static void lomac_cred_relabel(struct ucred *cred, struct label *newlabel) { struct mac_lomac *source, *dest; source = SLOT(newlabel); dest = SLOT(cred->cr_label); try_relabel(source, dest); } static void lomac_devfs_create_device(struct ucred *cred, struct mount *mp, struct cdev *dev, struct devfs_dirent *de, struct label *delabel) { struct mac_lomac *ml; const char *dn; int lomac_type; ml = SLOT(delabel); dn = devtoname(dev); if (strcmp(dn, "null") == 0 || strcmp(dn, "zero") == 0 || strcmp(dn, "random") == 0 || strncmp(dn, "fd/", strlen("fd/")) == 0 || strncmp(dn, "ttyv", strlen("ttyv")) == 0) lomac_type = MAC_LOMAC_TYPE_EQUAL; else if (ptys_equal && (strncmp(dn, "ttyp", strlen("ttyp")) == 0 || strncmp(dn, "pts/", strlen("pts/")) == 0 || strncmp(dn, "ptyp", strlen("ptyp")) == 0)) lomac_type = MAC_LOMAC_TYPE_EQUAL; else lomac_type = MAC_LOMAC_TYPE_HIGH; lomac_set_single(ml, lomac_type, 0); } static void lomac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, struct devfs_dirent *de, struct label *delabel) { struct mac_lomac *ml; ml = SLOT(delabel); lomac_set_single(ml, MAC_LOMAC_TYPE_HIGH, 0); } static void lomac_devfs_create_symlink(struct ucred *cred, struct mount *mp, struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de, struct label *delabel) { struct mac_lomac *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(delabel); lomac_copy_single(source, dest); } static void lomac_devfs_update(struct mount *mp, struct devfs_dirent *de, struct label *delabel, struct vnode *vp, struct label *vplabel) { struct mac_lomac *source, *dest; source = SLOT(vplabel); dest = SLOT(delabel); lomac_copy(source, dest); } static void lomac_devfs_vnode_associate(struct mount *mp, struct label *mplabel, struct devfs_dirent *de, struct label *delabel, struct vnode *vp, struct label *vplabel) { struct mac_lomac *source, *dest; source = SLOT(delabel); dest = SLOT(vplabel); lomac_copy_single(source, dest); } static int lomac_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, struct label *ifplabel, struct label *newlabel) { struct mac_lomac *subj, *new; int error; subj = SLOT(cred->cr_label); new = SLOT(newlabel); /* * If there is a LOMAC label update for the interface, it may be an * update of the single, range, or both. */ error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH); if (error) return (error); /* * Relabling network interfaces requires LOMAC privilege. */ error = lomac_subject_privileged(subj); if (error) return (error); /* * If the LOMAC label is to be changed, authorize as appropriate. */ if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) { /* * Fill in the missing parts from the previous label. */ if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) lomac_copy_single(subj, new); if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0) lomac_copy_range(subj, new); /* * Rely on the traditional superuser status for the LOMAC * interface relabel requirements. XXXMAC: This will go * away. * * XXXRW: This is also redundant to a higher layer check. */ error = priv_check_cred(cred, PRIV_NET_SETIFMAC); if (error) return (EPERM); /* * XXXMAC: Additional consistency tests regarding the single * and the range of the new label might be performed here. */ } return (0); } static int lomac_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *p, *i; if (!lomac_enabled) return (0); p = SLOT(mlabel); i = SLOT(ifplabel); return (lomac_single_in_range(p, i) ? 0 : EACCES); } static void lomac_ifnet_create(struct ifnet *ifp, struct label *ifplabel) { char tifname[IFNAMSIZ], *p, *q; char tiflist[sizeof(trusted_interfaces)]; struct mac_lomac *dest; int len, grade; dest = SLOT(ifplabel); if (ifp->if_type == IFT_LOOP) { grade = MAC_LOMAC_TYPE_EQUAL; goto set; } if (trust_all_interfaces) { grade = MAC_LOMAC_TYPE_HIGH; goto set; } grade = MAC_LOMAC_TYPE_LOW; if (trusted_interfaces[0] == '\0' || !strvalid(trusted_interfaces, sizeof(trusted_interfaces))) goto set; bzero(tiflist, sizeof(tiflist)); for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++) if(*p != ' ' && *p != '\t') *q = *p; 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, ifp->if_xname) == 0) { grade = MAC_LOMAC_TYPE_HIGH; break; } } else { *p = '\0'; printf("MAC/LOMAC warning: interface name " "\"%s\" is too long (must be < %d)\n", q, IFNAMSIZ); } if (*p == '\0') break; q = p + 1; } } set: lomac_set_single(dest, grade, 0); lomac_set_range(dest, grade, 0, grade, 0); } static void lomac_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *source, *dest; source = SLOT(ifplabel); dest = SLOT(mlabel); lomac_copy_single(source, dest); } static void lomac_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, struct label *ifplabel, struct label *newlabel) { struct mac_lomac *source, *dest; source = SLOT(newlabel); dest = SLOT(ifplabel); try_relabel(source, dest); } static int lomac_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *p, *i; if (!lomac_enabled) return (0); p = SLOT(mlabel); i = SLOT(inplabel); return (lomac_equal_single(p, i) ? 0 : EACCES); } static int lomac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, struct label *inplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(inplabel); if (!lomac_dominate_single(obj, subj)) return (ENOENT); return (0); } static void lomac_inpcb_create(struct socket *so, struct label *solabel, struct inpcb *inp, struct label *inplabel) { struct mac_lomac *source, *dest; source = SLOT(solabel); dest = SLOT(inplabel); lomac_copy_single(source, dest); } static void lomac_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *source, *dest; source = SLOT(inplabel); dest = SLOT(mlabel); lomac_copy_single(source, dest); } static void lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel, struct inpcb *inp, struct label *inplabel) { struct mac_lomac *source, *dest; SOCK_LOCK_ASSERT(so); source = SLOT(solabel); dest = SLOT(inplabel); lomac_copy_single(source, dest); } static void lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, struct label *q6label) { struct mac_lomac *source, *dest; source = SLOT(mlabel); dest = SLOT(q6label); lomac_copy_single(source, dest); } static int lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, struct label *q6label) { struct mac_lomac *a, *b; a = SLOT(q6label); b = SLOT(mlabel); return (lomac_equal_single(a, b)); } static void lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, struct label *mlabel) { struct mac_lomac *source, *dest; source = SLOT(q6label); dest = SLOT(mlabel); /* Just use the head, since we require them all to match. */ lomac_copy_single(source, dest); } static void lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6, struct label *q6label) { /* NOOP: we only accept matching labels, so no need to update */ } static void lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, struct label *qlabel) { struct mac_lomac *source, *dest; source = SLOT(mlabel); dest = SLOT(qlabel); lomac_copy_single(source, dest); } static int lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, struct label *qlabel) { struct mac_lomac *a, *b; a = SLOT(qlabel); b = SLOT(mlabel); return (lomac_equal_single(a, b)); } static void lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *source, *dest; source = SLOT(qlabel); dest = SLOT(mlabel); /* Just use the head, since we require them all to match. */ lomac_copy_single(source, dest); } static void lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q, struct label *qlabel) { /* NOOP: we only accept matching labels, so no need to update */ } static int lomac_kld_check_load(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (lomac_subject_privileged(subj)) return (EPERM); if (!lomac_high_single(obj)) return (EACCES); return (0); } static void lomac_mount_create(struct ucred *cred, struct mount *mp, struct label *mplabel) { struct mac_lomac *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(mplabel); lomac_copy_single(source, dest); } static void lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *dest; dest = SLOT(mlabel); lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); } static void lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, struct mbuf *msend, struct label *msendlabel) { struct mac_lomac *source, *dest; source = SLOT(mrecvlabel); dest = SLOT(msendlabel); lomac_copy_single(source, dest); } static void lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel) { struct mac_lomac *dest; dest = SLOT(mlabel); /* XXX: where is the label for the firewall really coming from? */ lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); } static void lomac_netinet_fragment(struct mbuf *m, struct label *mlabel, struct mbuf *frag, struct label *fraglabel) { struct mac_lomac *source, *dest; source = SLOT(mlabel); dest = SLOT(fraglabel); lomac_copy_single(source, dest); } static void lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, struct mbuf *msend, struct label *msendlabel) { struct mac_lomac *source, *dest; source = SLOT(mrecvlabel); dest = SLOT(msendlabel); lomac_copy_single(source, dest); } static void lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *dest; dest = SLOT(mlabel); lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); } static void lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *dest; dest = SLOT(mlabel); lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0); } static int lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) { if (!lomac_enabled) return (0); /* XXX: This will be implemented soon... */ return (0); } static int lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp, struct label *pplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(pplabel); if (!lomac_dominate_single(obj, subj)) return (maybe_demote(subj, obj, "reading", "pipe", NULL)); return (0); } static int lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, struct label *pplabel, struct label *newlabel) { struct mac_lomac *subj, *obj, *new; int error; new = SLOT(newlabel); subj = SLOT(cred->cr_label); obj = SLOT(pplabel); /* * If there is a LOMAC label update for a pipe, it must be a single * update. */ error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); if (error) return (error); /* * To perform a relabel of a pipe (LOMAC label or not), LOMAC must * authorize the relabel. */ if (!lomac_single_in_range(obj, subj)) return (EPERM); /* * If the LOMAC label is to be changed, authorize as appropriate. */ if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { /* * To change the LOMAC label on a pipe, the new pipe label * must be in the subject range. */ if (!lomac_single_in_range(new, subj)) return (EPERM); /* * To change the LOMAC label on a pipe to be EQUAL, the * subject must have appropriate privilege. */ if (lomac_contains_equal(new)) { error = lomac_subject_privileged(subj); if (error) return (error); } } return (0); } static int lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp, struct label *pplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(pplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static void lomac_pipe_create(struct ucred *cred, struct pipepair *pp, struct label *pplabel) { struct mac_lomac *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(pplabel); lomac_copy_single(source, dest); } static void lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp, struct label *pplabel, struct label *newlabel) { struct mac_lomac *source, *dest; source = SLOT(newlabel); dest = SLOT(pplabel); try_relabel(source, dest); } /* * Some system privileges are allowed regardless of integrity grade; others * are allowed only when running with privilege with respect to the LOMAC * policy as they might otherwise allow bypassing of the integrity policy. */ static int lomac_priv_check(struct ucred *cred, int priv) { struct mac_lomac *subj; int error; if (!lomac_enabled) return (0); /* * Exempt only specific privileges from the LOMAC integrity policy. */ switch (priv) { case PRIV_KTRACE: case PRIV_MSGBUF: /* * Allow processes to manipulate basic process audit properties, and * to submit audit records. */ case PRIV_AUDIT_GETAUDIT: case PRIV_AUDIT_SETAUDIT: case PRIV_AUDIT_SUBMIT: /* * Allow processes to manipulate their regular UNIX credentials. */ case PRIV_CRED_SETUID: case PRIV_CRED_SETEUID: case PRIV_CRED_SETGID: case PRIV_CRED_SETEGID: case PRIV_CRED_SETGROUPS: case PRIV_CRED_SETREUID: case PRIV_CRED_SETREGID: case PRIV_CRED_SETRESUID: case PRIV_CRED_SETRESGID: /* * Allow processes to perform system monitoring. */ case PRIV_SEEOTHERGIDS: case PRIV_SEEOTHERUIDS: break; /* * Allow access to general process debugging facilities. We * separately control debugging based on MAC label. */ case PRIV_DEBUG_DIFFCRED: case PRIV_DEBUG_SUGID: case PRIV_DEBUG_UNPRIV: /* * Allow manipulating jails. */ case PRIV_JAIL_ATTACH: /* * Allow privilege with respect to the Partition policy, but not the * Privs policy. */ case PRIV_MAC_PARTITION: /* * Allow privilege with respect to process resource limits and login * context. */ case PRIV_PROC_LIMIT: case PRIV_PROC_SETLOGIN: case PRIV_PROC_SETRLIMIT: /* * Allow System V and POSIX IPC privileges. */ case PRIV_IPC_READ: case PRIV_IPC_WRITE: case PRIV_IPC_ADMIN: case PRIV_IPC_MSGSIZE: case PRIV_MQ_ADMIN: /* * Allow certain scheduler manipulations -- possibly this should be * controlled by more fine-grained policy, as potentially low * integrity processes can deny CPU to higher integrity ones. */ case PRIV_SCHED_DIFFCRED: case PRIV_SCHED_SETPRIORITY: case PRIV_SCHED_RTPRIO: case PRIV_SCHED_SETPOLICY: case PRIV_SCHED_SET: case PRIV_SCHED_SETPARAM: /* * More IPC privileges. */ case PRIV_SEM_WRITE: /* * Allow signaling privileges subject to integrity policy. */ case PRIV_SIGNAL_DIFFCRED: case PRIV_SIGNAL_SUGID: /* * Allow access to only limited sysctls from lower integrity levels; * piggy-back on the Jail definition. */ case PRIV_SYSCTL_WRITEJAIL: /* * Allow TTY-based privileges, subject to general device access using * labels on TTY device nodes, but not console privilege. */ case PRIV_TTY_DRAINWAIT: case PRIV_TTY_DTRWAIT: case PRIV_TTY_EXCLUSIVE: case PRIV_TTY_STI: case PRIV_TTY_SETA: /* * Grant most VFS privileges, as almost all are in practice bounded * by more specific checks using labels. */ case PRIV_VFS_READ: case PRIV_VFS_WRITE: case PRIV_VFS_ADMIN: case PRIV_VFS_EXEC: case PRIV_VFS_LOOKUP: case PRIV_VFS_CHFLAGS_DEV: case PRIV_VFS_CHOWN: case PRIV_VFS_CHROOT: case PRIV_VFS_RETAINSUGID: case PRIV_VFS_EXCEEDQUOTA: case PRIV_VFS_FCHROOT: case PRIV_VFS_FHOPEN: case PRIV_VFS_FHSTATFS: case PRIV_VFS_GENERATION: case PRIV_VFS_GETFH: case PRIV_VFS_GETQUOTA: case PRIV_VFS_LINK: case PRIV_VFS_MOUNT: case PRIV_VFS_MOUNT_OWNER: case PRIV_VFS_MOUNT_PERM: case PRIV_VFS_MOUNT_SUIDDIR: case PRIV_VFS_MOUNT_NONUSER: case PRIV_VFS_SETGID: case PRIV_VFS_STICKYFILE: case PRIV_VFS_SYSFLAGS: case PRIV_VFS_UNMOUNT: /* * Allow VM privileges; it would be nice if these were subject to * resource limits. */ case PRIV_VM_MADV_PROTECT: case PRIV_VM_MLOCK: case PRIV_VM_MUNLOCK: case PRIV_VM_SWAP_NOQUOTA: case PRIV_VM_SWAP_NORLIMIT: /* * Allow some but not all network privileges. In general, dont allow * reconfiguring the network stack, just normal use. */ case PRIV_NETINET_RESERVEDPORT: case PRIV_NETINET_RAW: case PRIV_NETINET_REUSEPORT: break; /* * All remaining system privileges are allow only if the process * holds privilege with respect to the LOMAC policy. */ default: subj = SLOT(cred->cr_label); error = lomac_subject_privileged(subj); if (error) return (error); } return (0); } static int lomac_proc_check_debug(struct ucred *cred, struct proc *p) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(p->p_ucred->cr_label); /* XXX: range checks */ if (!lomac_dominate_single(obj, subj)) return (ESRCH); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_proc_check_sched(struct ucred *cred, struct proc *p) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(p->p_ucred->cr_label); /* XXX: range checks */ if (!lomac_dominate_single(obj, subj)) return (ESRCH); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(p->p_ucred->cr_label); /* XXX: range checks */ if (!lomac_dominate_single(obj, subj)) return (ESRCH); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static void lomac_proc_destroy_label(struct label *label) { mtx_destroy(&PSLOT(label)->mtx); free(PSLOT(label), M_LOMAC); PSLOT_SET(label, NULL); } static void lomac_proc_init_label(struct label *label) { PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC, M_ZERO | M_WAITOK)); mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF); } static int lomac_socket_check_deliver(struct socket *so, struct label *solabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *p, *s; int error; if (!lomac_enabled) return (0); p = SLOT(mlabel); s = SLOT(solabel); SOCK_LOCK(so); error = lomac_equal_single(p, s) ? 0 : EACCES; SOCK_UNLOCK(so); return (error); } static int lomac_socket_check_relabel(struct ucred *cred, struct socket *so, struct label *solabel, struct label *newlabel) { struct mac_lomac *subj, *obj, *new; int error; SOCK_LOCK_ASSERT(so); new = SLOT(newlabel); subj = SLOT(cred->cr_label); obj = SLOT(solabel); /* * If there is a LOMAC label update for the socket, it may be an * update of single. */ error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE); if (error) return (error); /* * To relabel a socket, the old socket single must be in the subject * range. */ if (!lomac_single_in_range(obj, subj)) return (EPERM); /* * If the LOMAC label is to be changed, authorize as appropriate. */ if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { /* * To relabel a socket, the new socket single must be in the * subject range. */ if (!lomac_single_in_range(new, subj)) return (EPERM); /* * To change the LOMAC label on the socket to contain EQUAL, * the subject must have appropriate privilege. */ if (lomac_contains_equal(new)) { error = lomac_subject_privileged(subj); if (error) return (error); } } return (0); } static int lomac_socket_check_visible(struct ucred *cred, struct socket *so, struct label *solabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(solabel); SOCK_LOCK(so); if (!lomac_dominate_single(obj, subj)) { SOCK_UNLOCK(so); return (ENOENT); } SOCK_UNLOCK(so); return (0); } static void lomac_socket_create(struct ucred *cred, struct socket *so, struct label *solabel) { struct mac_lomac *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(solabel); lomac_copy_single(source, dest); } static void lomac_socket_create_mbuf(struct socket *so, struct label *solabel, struct mbuf *m, struct label *mlabel) { struct mac_lomac *source, *dest; source = SLOT(solabel); dest = SLOT(mlabel); SOCK_LOCK(so); lomac_copy_single(source, dest); SOCK_UNLOCK(so); } static void lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel, struct socket *newso, struct label *newsolabel) { struct mac_lomac source, *dest; SOCK_LOCK(oldso); source = *SLOT(oldsolabel); SOCK_UNLOCK(oldso); dest = SLOT(newsolabel); SOCK_LOCK(newso); lomac_copy_single(&source, dest); SOCK_UNLOCK(newso); } static void lomac_socket_relabel(struct ucred *cred, struct socket *so, struct label *solabel, struct label *newlabel) { struct mac_lomac *source, *dest; SOCK_LOCK_ASSERT(so); source = SLOT(newlabel); dest = SLOT(solabel); try_relabel(source, dest); } static void lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, struct socket *so, struct label *sopeerlabel) { struct mac_lomac *source, *dest; source = SLOT(mlabel); dest = SLOT(sopeerlabel); SOCK_LOCK(so); lomac_copy_single(source, dest); SOCK_UNLOCK(so); } static void lomac_socketpeer_set_from_socket(struct socket *oldso, struct label *oldsolabel, struct socket *newso, struct label *newsopeerlabel) { struct mac_lomac source, *dest; SOCK_LOCK(oldso); source = *SLOT(oldsolabel); SOCK_UNLOCK(oldso); dest = SLOT(newsopeerlabel); SOCK_LOCK(newso); lomac_copy_single(&source, dest); SOCK_UNLOCK(newso); } static void lomac_syncache_create(struct label *label, struct inpcb *inp) { struct mac_lomac *source, *dest; source = SLOT(inp->inp_label); dest = SLOT(label); lomac_copy(source, dest); } static void lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, struct label *mlabel) { struct mac_lomac *source, *dest; source = SLOT(sc_label); dest = SLOT(mlabel); lomac_copy(source, dest); } static int lomac_system_check_acct(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (lomac_subject_privileged(subj)) return (EPERM); if (!lomac_high_single(obj)) return (EACCES); return (0); } static int lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (lomac_subject_privileged(subj)) return (EPERM); if (!lomac_high_single(obj)) return (EACCES); return (0); } static int lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_lomac *subj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); if (lomac_subject_privileged(subj)) return (EPERM); return (0); } static int lomac_system_check_swapon(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (lomac_subject_privileged(subj)) return (EPERM); if (!lomac_high_single(obj)) return (EACCES); return (0); } static int lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) { struct mac_lomac *subj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); /* * Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high, * but also require privilege to change them. */ if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { #ifdef notdef if (!lomac_subject_dominate_high(subj)) return (EACCES); #endif if (lomac_subject_privileged(subj)) return (EPERM); } return (0); } static void lomac_thread_userret(struct thread *td) { struct proc *p = td->td_proc; struct mac_lomac_proc *subj = PSLOT(p->p_label); struct ucred *newcred, *oldcred; int dodrop; mtx_lock(&subj->mtx); if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) { dodrop = 0; mtx_unlock(&subj->mtx); newcred = crget(); /* * Prevent a lock order reversal in mac_proc_vm_revoke; * ideally, the other user of subj->mtx wouldn't be holding * Giant. */ mtx_lock(&Giant); PROC_LOCK(p); mtx_lock(&subj->mtx); /* * Check if we lost the race while allocating the cred. */ if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) { crfree(newcred); goto out; } oldcred = p->p_ucred; crcopy(newcred, oldcred); crhold(newcred); lomac_copy(&subj->mac_lomac, SLOT(newcred->cr_label)); proc_set_cred(p, newcred); crfree(oldcred); dodrop = 1; out: mtx_unlock(&subj->mtx); PROC_UNLOCK(p); if (dodrop) mac_proc_vm_revoke(curthread); mtx_unlock(&Giant); } else { mtx_unlock(&subj->mtx); } } static int lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel, struct vnode *vp, struct label *vplabel) { struct mac_lomac ml_temp, *source, *dest; int buflen, error; source = SLOT(mplabel); dest = SLOT(vplabel); buflen = sizeof(ml_temp); bzero(&ml_temp, buflen); error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread); if (error == ENOATTR || error == EOPNOTSUPP) { /* Fall back to the mntlabel. */ lomac_copy_single(source, dest); return (0); } else if (error) return (error); if (buflen != sizeof(ml_temp)) { if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) { printf("lomac_vnode_associate_extattr: bad size %d\n", buflen); return (EPERM); } bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle)); buflen = sizeof(ml_temp); (void)vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&ml_temp, curthread); } if (lomac_valid(&ml_temp) != 0) { printf("lomac_vnode_associate_extattr: invalid\n"); return (EPERM); } if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) != MAC_LOMAC_FLAG_SINGLE) { printf("lomac_vnode_associate_extattr: not single\n"); return (EPERM); } lomac_copy_single(&ml_temp, dest); return (0); } static void lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, struct vnode *vp, struct label *vplabel) { struct mac_lomac *source, *dest; source = SLOT(mplabel); dest = SLOT(vplabel); lomac_copy_single(source, dest); } static int lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct componentname *cnp, struct vattr *vap) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); if (obj->ml_flags & MAC_LOMAC_FLAG_AUX && !lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle)) return (EACCES); return (0); } static int lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, struct label *vplabel, acl_type_t type) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct vnode *vp, struct label *vplabel, struct componentname *cnp) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp, struct label *vplabel, int prot, int flags) { struct mac_lomac *subj, *obj; /* * Rely on the use of open()-time protections to handle * non-revocation cases. */ if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { if (!lomac_subject_dominate(subj, obj)) return (EACCES); } if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { if (!lomac_dominate_single(obj, subj)) return (maybe_demote(subj, obj, "mapping", "file", vp)); } return (0); } static void lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp, struct label *vplabel, /* XXX vm_prot_t */ int *prot) { struct mac_lomac *subj, *obj; /* * Rely on the use of open()-time protections to handle * non-revocation cases. */ if (!lomac_enabled || !revocation_enabled) return; subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) *prot &= ~VM_PROT_WRITE; } static int lomac_vnode_check_open(struct ucred *cred, struct vnode *vp, struct label *vplabel, accmode_t accmode) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); /* XXX privilege override for admin? */ if (accmode & VMODIFY_PERMS) { if (!lomac_subject_dominate(subj, obj)) return (EACCES); } return (0); } static int lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, struct vnode *vp, struct label *vplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled || !revocation_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(vplabel); if (!lomac_dominate_single(obj, subj)) return (maybe_demote(subj, obj, "reading", "file", vp)); return (0); } static int lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct label *newlabel) { struct mac_lomac *old, *new, *subj; int error; old = SLOT(vplabel); new = SLOT(newlabel); subj = SLOT(cred->cr_label); /* * If there is a LOMAC label update for the vnode, it must be a * single label, with an optional explicit auxiliary single. */ error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX); if (error) return (error); /* * To perform a relabel of the vnode (LOMAC label or not), LOMAC must * authorize the relabel. */ if (!lomac_single_in_range(old, subj)) return (EPERM); /* * If the LOMAC label is to be changed, authorize as appropriate. */ if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) { /* * To change the LOMAC label on a vnode, the new vnode label * must be in the subject range. */ if (!lomac_single_in_range(new, subj)) return (EPERM); /* * To change the LOMAC label on the vnode to be EQUAL, the * subject must have appropriate privilege. */ if (lomac_contains_equal(new)) { error = lomac_subject_privileged(subj); if (error) return (error); } } if (new->ml_flags & MAC_LOMAC_FLAG_AUX) { /* * Fill in the missing parts from the previous label. */ if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) lomac_copy_single(subj, new); /* * To change the auxiliary LOMAC label on a vnode, the new * vnode label must be in the subject range. */ if (!lomac_auxsingle_in_range(new, subj)) return (EPERM); /* * To change the auxiliary LOMAC label on the vnode to be * EQUAL, the subject must have appropriate privilege. */ if (lomac_contains_equal(new)) { error = lomac_subject_privileged(subj); if (error) return (error); } } return (0); } static int lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct vnode *vp, struct label *vplabel, struct componentname *cnp) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct vnode *vp, struct label *vplabel, int samedir, struct componentname *cnp) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); if (vp != NULL) { obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); } return (0); } static int lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, struct label *vplabel, acl_type_t type, struct acl *acl) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, struct label *vplabel, int attrnamespace, const char *name) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); /* XXX: protect the MAC EA in a special way? */ return (0); } static int lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, struct label *vplabel, u_long flags) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, struct label *vplabel, mode_t mode) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, struct label *vplabel, uid_t uid, gid_t gid) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct timespec atime, struct timespec mtime) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct vnode *vp, struct label *vplabel, struct componentname *cnp) { struct mac_lomac *subj, *obj; if (!lomac_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred, struct vnode *vp, struct label *vplabel) { struct mac_lomac *subj, *obj; if (!lomac_enabled || !revocation_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(vplabel); if (!lomac_subject_dominate(subj, obj)) return (EACCES); return (0); } static int lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp, struct label *mplabel, struct vnode *dvp, struct label *dvplabel, struct vnode *vp, struct label *vplabel, struct componentname *cnp) { struct mac_lomac *source, *dest, *dir, temp; size_t buflen; int error; buflen = sizeof(temp); bzero(&temp, buflen); source = SLOT(cred->cr_label); dest = SLOT(vplabel); dir = SLOT(dvplabel); if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) { lomac_copy_auxsingle(dir, &temp); lomac_set_single(&temp, dir->ml_auxsingle.mle_type, dir->ml_auxsingle.mle_grade); } else { lomac_copy_single(source, &temp); } error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); if (error == 0) lomac_copy(&temp, dest); return (error); } static void lomac_vnode_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, struct label *vplabel, struct label *interpvplabel, struct image_params *imgp, struct label *execlabel) { struct mac_lomac *source, *dest, *obj, *robj; source = SLOT(old->cr_label); dest = SLOT(new->cr_label); obj = SLOT(vplabel); robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; lomac_copy(source, dest); /* * If there's an auxiliary label on the real object, respect it and * assume that this level should be assumed immediately if a higher * level is currently in place. */ if (robj->ml_flags & MAC_LOMAC_FLAG_AUX && !lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single) && lomac_auxsingle_in_range(robj, dest)) lomac_set_single(dest, robj->ml_auxsingle.mle_type, robj->ml_auxsingle.mle_grade); /* * Restructuring to use the execve transitioning mechanism instead of * the normal demotion mechanism here would be difficult, so just * copy the label over and perform standard demotion. This is also * non-optimal because it will result in the intermediate label "new" * being created and immediately recycled. */ if (lomac_enabled && revocation_enabled && !lomac_dominate_single(obj, source)) (void)maybe_demote(source, obj, "executing", "file", vp); } static int lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp, struct label *vplabel, struct label *interpvplabel, struct image_params *imgp, struct label *execlabel) { struct mac_lomac *subj, *obj, *robj; if (!lomac_enabled || !revocation_enabled) return (0); subj = SLOT(old->cr_label); obj = SLOT(vplabel); robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj; return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX && !lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single) && lomac_auxsingle_in_range(robj, subj)) || !lomac_dominate_single(obj, subj)); } static void lomac_vnode_relabel(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct label *newlabel) { struct mac_lomac *source, *dest; source = SLOT(newlabel); dest = SLOT(vplabel); try_relabel(source, dest); } static int lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct label *intlabel) { struct mac_lomac *source, temp; size_t buflen; int error; buflen = sizeof(temp); bzero(&temp, buflen); source = SLOT(intlabel); if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0) return (0); lomac_copy_single(source, &temp); error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread); return (error); } static struct mac_policy_ops lomac_ops = { .mpo_init = lomac_init, .mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive, .mpo_bpfdesc_create = lomac_bpfdesc_create, .mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf, .mpo_bpfdesc_destroy_label = lomac_destroy_label, .mpo_bpfdesc_init_label = lomac_init_label, .mpo_cred_check_relabel = lomac_cred_check_relabel, .mpo_cred_check_visible = lomac_cred_check_visible, .mpo_cred_copy_label = lomac_copy_label, .mpo_cred_create_swapper = lomac_cred_create_swapper, .mpo_cred_create_init = lomac_cred_create_init, .mpo_cred_destroy_label = lomac_destroy_label, .mpo_cred_externalize_label = lomac_externalize_label, .mpo_cred_init_label = lomac_init_label, .mpo_cred_internalize_label = lomac_internalize_label, .mpo_cred_relabel = lomac_cred_relabel, .mpo_devfs_create_device = lomac_devfs_create_device, .mpo_devfs_create_directory = lomac_devfs_create_directory, .mpo_devfs_create_symlink = lomac_devfs_create_symlink, .mpo_devfs_destroy_label = lomac_destroy_label, .mpo_devfs_init_label = lomac_init_label, .mpo_devfs_update = lomac_devfs_update, .mpo_devfs_vnode_associate = lomac_devfs_vnode_associate, .mpo_ifnet_check_relabel = lomac_ifnet_check_relabel, .mpo_ifnet_check_transmit = lomac_ifnet_check_transmit, .mpo_ifnet_copy_label = lomac_copy_label, .mpo_ifnet_create = lomac_ifnet_create, .mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf, .mpo_ifnet_destroy_label = lomac_destroy_label, .mpo_ifnet_externalize_label = lomac_externalize_label, .mpo_ifnet_init_label = lomac_init_label, .mpo_ifnet_internalize_label = lomac_internalize_label, .mpo_ifnet_relabel = lomac_ifnet_relabel, .mpo_syncache_create = lomac_syncache_create, .mpo_syncache_destroy_label = lomac_destroy_label, .mpo_syncache_init_label = lomac_init_label_waitcheck, .mpo_inpcb_check_deliver = lomac_inpcb_check_deliver, .mpo_inpcb_check_visible = lomac_inpcb_check_visible, .mpo_inpcb_create = lomac_inpcb_create, .mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf, .mpo_inpcb_destroy_label = lomac_destroy_label, .mpo_inpcb_init_label = lomac_init_label_waitcheck, .mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel, .mpo_ip6q_create = lomac_ip6q_create, .mpo_ip6q_destroy_label = lomac_destroy_label, .mpo_ip6q_init_label = lomac_init_label_waitcheck, .mpo_ip6q_match = lomac_ip6q_match, .mpo_ip6q_reassemble = lomac_ip6q_reassemble, .mpo_ip6q_update = lomac_ip6q_update, .mpo_ipq_create = lomac_ipq_create, .mpo_ipq_destroy_label = lomac_destroy_label, .mpo_ipq_init_label = lomac_init_label_waitcheck, .mpo_ipq_match = lomac_ipq_match, .mpo_ipq_reassemble = lomac_ipq_reassemble, .mpo_ipq_update = lomac_ipq_update, .mpo_kld_check_load = lomac_kld_check_load, .mpo_mbuf_copy_label = lomac_copy_label, .mpo_mbuf_destroy_label = lomac_destroy_label, .mpo_mbuf_init_label = lomac_init_label_waitcheck, .mpo_mount_create = lomac_mount_create, .mpo_mount_destroy_label = lomac_destroy_label, .mpo_mount_init_label = lomac_init_label, .mpo_netinet_arp_send = lomac_netinet_arp_send, .mpo_netinet_firewall_reply = lomac_netinet_firewall_reply, .mpo_netinet_firewall_send = lomac_netinet_firewall_send, .mpo_netinet_fragment = lomac_netinet_fragment, .mpo_netinet_icmp_reply = lomac_netinet_icmp_reply, .mpo_netinet_igmp_send = lomac_netinet_igmp_send, .mpo_netinet6_nd6_send = lomac_netinet6_nd6_send, .mpo_pipe_check_ioctl = lomac_pipe_check_ioctl, .mpo_pipe_check_read = lomac_pipe_check_read, .mpo_pipe_check_relabel = lomac_pipe_check_relabel, .mpo_pipe_check_write = lomac_pipe_check_write, .mpo_pipe_copy_label = lomac_copy_label, .mpo_pipe_create = lomac_pipe_create, .mpo_pipe_destroy_label = lomac_destroy_label, .mpo_pipe_externalize_label = lomac_externalize_label, .mpo_pipe_init_label = lomac_init_label, .mpo_pipe_internalize_label = lomac_internalize_label, .mpo_pipe_relabel = lomac_pipe_relabel, .mpo_priv_check = lomac_priv_check, .mpo_proc_check_debug = lomac_proc_check_debug, .mpo_proc_check_sched = lomac_proc_check_sched, .mpo_proc_check_signal = lomac_proc_check_signal, .mpo_proc_destroy_label = lomac_proc_destroy_label, .mpo_proc_init_label = lomac_proc_init_label, .mpo_socket_check_deliver = lomac_socket_check_deliver, .mpo_socket_check_relabel = lomac_socket_check_relabel, .mpo_socket_check_visible = lomac_socket_check_visible, .mpo_socket_copy_label = lomac_copy_label, .mpo_socket_create = lomac_socket_create, .mpo_socket_create_mbuf = lomac_socket_create_mbuf, .mpo_socket_destroy_label = lomac_destroy_label, .mpo_socket_externalize_label = lomac_externalize_label, .mpo_socket_init_label = lomac_init_label_waitcheck, .mpo_socket_internalize_label = lomac_internalize_label, .mpo_socket_newconn = lomac_socket_newconn, .mpo_socket_relabel = lomac_socket_relabel, .mpo_socketpeer_destroy_label = lomac_destroy_label, .mpo_socketpeer_externalize_label = lomac_externalize_label, .mpo_socketpeer_init_label = lomac_init_label_waitcheck, .mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf, .mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket, .mpo_syncache_create_mbuf = lomac_syncache_create_mbuf, .mpo_system_check_acct = lomac_system_check_acct, .mpo_system_check_auditctl = lomac_system_check_auditctl, .mpo_system_check_swapoff = lomac_system_check_swapoff, .mpo_system_check_swapon = lomac_system_check_swapon, .mpo_system_check_sysctl = lomac_system_check_sysctl, .mpo_thread_userret = lomac_thread_userret, .mpo_vnode_associate_extattr = lomac_vnode_associate_extattr, .mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel, .mpo_vnode_check_access = lomac_vnode_check_open, .mpo_vnode_check_create = lomac_vnode_check_create, .mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl, .mpo_vnode_check_link = lomac_vnode_check_link, .mpo_vnode_check_mmap = lomac_vnode_check_mmap, .mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade, .mpo_vnode_check_open = lomac_vnode_check_open, .mpo_vnode_check_read = lomac_vnode_check_read, .mpo_vnode_check_relabel = lomac_vnode_check_relabel, .mpo_vnode_check_rename_from = lomac_vnode_check_rename_from, .mpo_vnode_check_rename_to = lomac_vnode_check_rename_to, .mpo_vnode_check_revoke = lomac_vnode_check_revoke, .mpo_vnode_check_setacl = lomac_vnode_check_setacl, .mpo_vnode_check_setextattr = lomac_vnode_check_setextattr, .mpo_vnode_check_setflags = lomac_vnode_check_setflags, .mpo_vnode_check_setmode = lomac_vnode_check_setmode, .mpo_vnode_check_setowner = lomac_vnode_check_setowner, .mpo_vnode_check_setutimes = lomac_vnode_check_setutimes, .mpo_vnode_check_unlink = lomac_vnode_check_unlink, .mpo_vnode_check_write = lomac_vnode_check_write, .mpo_vnode_copy_label = lomac_copy_label, .mpo_vnode_create_extattr = lomac_vnode_create_extattr, .mpo_vnode_destroy_label = lomac_destroy_label, .mpo_vnode_execve_transition = lomac_vnode_execve_transition, .mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition, .mpo_vnode_externalize_label = lomac_externalize_label, .mpo_vnode_init_label = lomac_init_label, .mpo_vnode_internalize_label = lomac_internalize_label, .mpo_vnode_relabel = lomac_vnode_relabel, .mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr, }; MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC", MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot);
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