/*- * Copyright (c) 1999-2002, 2007-2011 Robert N. M. Watson * Copyright (c) 2001-2005 McAfee, 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 McAfee * Research, the Security Research Division of McAfee, 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"). * * This software was developed at the University of Cambridge Computer * Laboratory with support from a grant from Google, Inc. * * 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. */ /* * Developed by the TrustedBSD Project. * * Biba fixed label mandatory integrity policy. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include SYSCTL_DECL(_security_mac); static SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "TrustedBSD mac_biba policy controls"); static int biba_label_size = sizeof(struct mac_biba); SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD, &biba_label_size, 0, "Size of struct mac_biba"); static int biba_enabled = 1; SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RWTUN, &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_RDTUN, &trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba"); static char trusted_interfaces[128]; SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RDTUN, trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba"); static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS; SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD, &max_compartments, 0, "Maximum supported compartments"); static int ptys_equal = 0; SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RWTUN, &ptys_equal, 0, "Label pty devices as biba/equal on create"); static int interfaces_equal = 1; SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RWTUN, &interfaces_equal, 0, "Label network interfaces as biba/equal on create"); static int revocation_enabled = 0; SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN, &revocation_enabled, 0, "Revoke access to objects on relabel"); static int biba_slot; #define SLOT(l) ((struct mac_biba *)mac_label_get((l), biba_slot)) #define SLOT_SET(l, val) mac_label_set((l), biba_slot, (uintptr_t)(val)) static uma_zone_t zone_biba; static __inline int biba_bit_set_empty(u_char *set) { int i; for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++) if (set[i] != 0) return (0); return (1); } static struct mac_biba * biba_alloc(int flag) { return (uma_zalloc(zone_biba, flag | M_ZERO)); } static void biba_free(struct mac_biba *mb) { if (mb != NULL) uma_zfree(zone_biba, mb); else atomic_add_int(&destroyed_not_inited, 1); } static int biba_atmostflags(struct mac_biba *mb, int flags) { if ((mb->mb_flags & flags) != mb->mb_flags) return (EINVAL); return (0); } static int biba_dominate_element(struct mac_biba_element *a, struct mac_biba_element *b) { int bit; 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("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: for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++) if (!MAC_BIBA_BIT_TEST(bit, a->mbe_compartments) && MAC_BIBA_BIT_TEST(bit, b->mbe_compartments)) return (0); return (a->mbe_grade >= b->mbe_grade); default: panic("biba_dominate_element: b->mbe_type invalid"); } default: panic("biba_dominate_element: a->mbe_type invalid"); } return (0); } static int biba_subject_dominate_high(struct mac_biba *mb) { struct mac_biba_element *element; KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, ("biba_effective_in_range: mb not effective")); element = &mb->mb_effective; return (element->mbe_type == MAC_BIBA_TYPE_EQUAL || element->mbe_type == MAC_BIBA_TYPE_HIGH); } static int biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb) { return (biba_dominate_element(&rangeb->mb_rangehigh, &rangea->mb_rangehigh) && biba_dominate_element(&rangea->mb_rangelow, &rangeb->mb_rangelow)); } static int biba_effective_in_range(struct mac_biba *effective, struct mac_biba *range) { KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, ("biba_effective_in_range: a not effective")); KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, ("biba_effective_in_range: b not range")); return (biba_dominate_element(&range->mb_rangehigh, &effective->mb_effective) && biba_dominate_element(&effective->mb_effective, &range->mb_rangelow)); return (1); } static int biba_dominate_effective(struct mac_biba *a, struct mac_biba *b) { KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, ("biba_dominate_effective: a not effective")); KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, ("biba_dominate_effective: b not effective")); return (biba_dominate_element(&a->mb_effective, &b->mb_effective)); } static int 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 biba_equal_effective(struct mac_biba *a, struct mac_biba *b) { KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, ("biba_equal_effective: a not effective")); KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, ("biba_equal_effective: b not effective")); return (biba_equal_element(&a->mb_effective, &b->mb_effective)); } static int biba_contains_equal(struct mac_biba *mb) { if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL) return (1); } if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) { if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL) return (1); if (mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) return (1); } return (0); } static int biba_subject_privileged(struct mac_biba *mb) { KASSERT((mb->mb_flags & MAC_BIBA_FLAGS_BOTH) == MAC_BIBA_FLAGS_BOTH, ("biba_subject_privileged: subject doesn't have both labels")); /* If the effective is EQUAL, it's ok. */ if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL) return (0); /* If either range endpoint is EQUAL, it's ok. */ if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL || mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL) return (0); /* If the range is low-high, it's ok. */ if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW && mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH) return (0); /* It's not ok. */ return (EPERM); } static int biba_high_effective(struct mac_biba *mb) { KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, ("biba_equal_effective: mb not effective")); return (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH); } static int biba_valid(struct mac_biba *mb) { if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { switch (mb->mb_effective.mbe_type) { case MAC_BIBA_TYPE_GRADE: break; case MAC_BIBA_TYPE_EQUAL: case MAC_BIBA_TYPE_HIGH: case MAC_BIBA_TYPE_LOW: if (mb->mb_effective.mbe_grade != 0 || !MAC_BIBA_BIT_SET_EMPTY( mb->mb_effective.mbe_compartments)) return (EINVAL); break; default: return (EINVAL); } } else { if (mb->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF) return (EINVAL); } if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) { switch (mb->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 (mb->mb_rangelow.mbe_grade != 0 || !MAC_BIBA_BIT_SET_EMPTY( mb->mb_rangelow.mbe_compartments)) return (EINVAL); break; default: return (EINVAL); } switch (mb->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 (mb->mb_rangehigh.mbe_grade != 0 || !MAC_BIBA_BIT_SET_EMPTY( mb->mb_rangehigh.mbe_compartments)) return (EINVAL); break; default: return (EINVAL); } if (!biba_dominate_element(&mb->mb_rangehigh, &mb->mb_rangelow)) return (EINVAL); } else { if (mb->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF || mb->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF) return (EINVAL); } return (0); } static void biba_set_range(struct mac_biba *mb, u_short typelow, u_short gradelow, u_char *compartmentslow, u_short typehigh, u_short gradehigh, u_char *compartmentshigh) { mb->mb_rangelow.mbe_type = typelow; mb->mb_rangelow.mbe_grade = gradelow; if (compartmentslow != NULL) memcpy(mb->mb_rangelow.mbe_compartments, compartmentslow, sizeof(mb->mb_rangelow.mbe_compartments)); mb->mb_rangehigh.mbe_type = typehigh; mb->mb_rangehigh.mbe_grade = gradehigh; if (compartmentshigh != NULL) memcpy(mb->mb_rangehigh.mbe_compartments, compartmentshigh, sizeof(mb->mb_rangehigh.mbe_compartments)); mb->mb_flags |= MAC_BIBA_FLAG_RANGE; } static void biba_set_effective(struct mac_biba *mb, u_short type, u_short grade, u_char *compartments) { mb->mb_effective.mbe_type = type; mb->mb_effective.mbe_grade = grade; if (compartments != NULL) memcpy(mb->mb_effective.mbe_compartments, compartments, sizeof(mb->mb_effective.mbe_compartments)); mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; } static void biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto) { KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0, ("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 biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto) { KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0, ("biba_copy_effective: labelfrom not effective")); labelto->mb_effective = labelfrom->mb_effective; labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; } static void biba_copy(struct mac_biba *source, struct mac_biba *dest) { if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) biba_copy_effective(source, dest); if (source->mb_flags & MAC_BIBA_FLAG_RANGE) biba_copy_range(source, dest); } /* * Policy module operations. */ static void biba_init(struct mac_policy_conf *conf) { zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); } /* * Label operations. */ static void biba_init_label(struct label *label) { SLOT_SET(label, biba_alloc(M_WAITOK)); } static int biba_init_label_waitcheck(struct label *label, int flag) { SLOT_SET(label, biba_alloc(flag)); if (SLOT(label) == NULL) return (ENOMEM); return (0); } static void biba_destroy_label(struct label *label) { biba_free(SLOT(label)); SLOT_SET(label, NULL); } /* * biba_element_to_string() accepts an sbuf and Biba element. It converts * the Biba element to a string and stores the result in the sbuf; if there * isn't space in the sbuf, -1 is returned. */ static int biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element) { int i, first; switch (element->mbe_type) { case MAC_BIBA_TYPE_HIGH: return (sbuf_printf(sb, "high")); case MAC_BIBA_TYPE_LOW: return (sbuf_printf(sb, "low")); case MAC_BIBA_TYPE_EQUAL: return (sbuf_printf(sb, "equal")); case MAC_BIBA_TYPE_GRADE: if (sbuf_printf(sb, "%d", element->mbe_grade) == -1) return (-1); first = 1; for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) { if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) { if (first) { if (sbuf_putc(sb, ':') == -1) return (-1); if (sbuf_printf(sb, "%d", i) == -1) return (-1); first = 0; } else { if (sbuf_printf(sb, "+%d", i) == -1) return (-1); } } } return (0); default: panic("biba_element_to_string: invalid type (%d)", element->mbe_type); } } /* * biba_to_string() converts a Biba label to a string, and places the results * in the passed sbuf. It returns 0 on success, or EINVAL if there isn't * room in the sbuf. Note: the sbuf will be modified even in a failure case, * so the caller may need to revert the sbuf by restoring the offset if * that's undesired. */ static int biba_to_string(struct sbuf *sb, struct mac_biba *mb) { if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { if (biba_element_to_string(sb, &mb->mb_effective) == -1) return (EINVAL); } if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) { if (sbuf_putc(sb, '(') == -1) return (EINVAL); if (biba_element_to_string(sb, &mb->mb_rangelow) == -1) return (EINVAL); if (sbuf_putc(sb, '-') == -1) return (EINVAL); if (biba_element_to_string(sb, &mb->mb_rangehigh) == -1) return (EINVAL); if (sbuf_putc(sb, ')') == -1) return (EINVAL); } return (0); } static int biba_externalize_label(struct label *label, char *element_name, struct sbuf *sb, int *claimed) { struct mac_biba *mb; if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) return (0); (*claimed)++; mb = SLOT(label); return (biba_to_string(sb, mb)); } static int biba_parse_element(struct mac_biba_element *element, char *string) { char *compartment, *end, *grade; int value; if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) { element->mbe_type = MAC_BIBA_TYPE_HIGH; element->mbe_grade = MAC_BIBA_TYPE_UNDEF; } else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) { element->mbe_type = MAC_BIBA_TYPE_LOW; element->mbe_grade = MAC_BIBA_TYPE_UNDEF; } else if (strcmp(string, "equal") == 0 || strcmp(string, "eq") == 0) { element->mbe_type = MAC_BIBA_TYPE_EQUAL; element->mbe_grade = MAC_BIBA_TYPE_UNDEF; } else { element->mbe_type = MAC_BIBA_TYPE_GRADE; /* * Numeric grade piece of the element. */ grade = strsep(&string, ":"); value = strtol(grade, &end, 10); if (end == grade || *end != '\0') return (EINVAL); if (value < 0 || value > 65535) return (EINVAL); element->mbe_grade = value; /* * Optional compartment piece of the element. If none are * included, we assume that the label has no compartments. */ if (string == NULL) return (0); if (*string == '\0') return (0); while ((compartment = strsep(&string, "+")) != NULL) { value = strtol(compartment, &end, 10); if (compartment == end || *end != '\0') return (EINVAL); if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS) return (EINVAL); MAC_BIBA_BIT_SET(value, element->mbe_compartments); } } return (0); } /* * Note: destructively consumes the string, make a local copy before calling * if that's a problem. */ static int biba_parse(struct mac_biba *mb, char *string) { char *rangehigh, *rangelow, *effective; int error; effective = strsep(&string, "("); if (*effective == '\0') effective = NULL; if (string != NULL) { rangelow = strsep(&string, "-"); if (string == NULL) return (EINVAL); rangehigh = strsep(&string, ")"); if (string == NULL) return (EINVAL); if (*string != '\0') return (EINVAL); } else { rangelow = NULL; rangehigh = NULL; } KASSERT((rangelow != NULL && rangehigh != NULL) || (rangelow == NULL && rangehigh == NULL), ("biba_parse: range mismatch")); bzero(mb, sizeof(*mb)); if (effective != NULL) { error = biba_parse_element(&mb->mb_effective, effective); if (error) return (error); mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE; } if (rangelow != NULL) { error = biba_parse_element(&mb->mb_rangelow, rangelow); if (error) return (error); error = biba_parse_element(&mb->mb_rangehigh, rangehigh); if (error) return (error); mb->mb_flags |= MAC_BIBA_FLAG_RANGE; } error = biba_valid(mb); if (error) return (error); return (0); } static int biba_internalize_label(struct label *label, char *element_name, char *element_data, int *claimed) { struct mac_biba *mb, mb_temp; int error; if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0) return (0); (*claimed)++; error = biba_parse(&mb_temp, element_data); if (error) return (error); mb = SLOT(label); *mb = mb_temp; return (0); } static void biba_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 biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel, struct ifnet *ifp, struct label *ifplabel) { struct mac_biba *a, *b; if (!biba_enabled) return (0); a = SLOT(dlabel); b = SLOT(ifplabel); if (biba_equal_effective(a, b)) return (0); return (EACCES); } static void biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d, struct label *dlabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(dlabel); biba_copy_effective(source, dest); } static void biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *source, *dest; source = SLOT(dlabel); dest = SLOT(mlabel); biba_copy_effective(source, dest); } static void biba_cred_associate_nfsd(struct ucred *cred) { struct mac_biba *label; label = SLOT(cred->cr_label); biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL); biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 0, NULL); } static int biba_cred_check_relabel(struct ucred *cred, struct label *newlabel) { struct mac_biba *subj, *new; int error; subj = SLOT(cred->cr_label); new = SLOT(newlabel); /* * If there is a Biba label update for the credential, it may * be an update of the effective, range, or both. */ error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); if (error) return (error); /* * If the Biba label is to be changed, authorize as appropriate. */ if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) { /* * If the change request modifies both the Biba label * effective and range, check that the new effective will be * in the new range. */ if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) == MAC_BIBA_FLAGS_BOTH && !biba_effective_in_range(new, new)) return (EINVAL); /* * To change the Biba effective label on a credential, the * new effective label must be in the current range. */ if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE && !biba_effective_in_range(new, subj)) return (EPERM); /* * To change the Biba range on a credential, the new range * label must be in the current range. */ if (new->mb_flags & MAC_BIBA_FLAG_RANGE && !biba_range_in_range(new, subj)) return (EPERM); /* * To have EQUAL in any component of the new credential Biba * label, the subject must already have EQUAL in their label. */ if (biba_contains_equal(new)) { error = biba_subject_privileged(subj); if (error) return (error); } } return (0); } static int biba_cred_check_visible(struct ucred *u1, struct ucred *u2) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(u1->cr_label); obj = SLOT(u2->cr_label); /* XXX: range */ if (!biba_dominate_effective(obj, subj)) return (ESRCH); return (0); } static void biba_cred_create_init(struct ucred *cred) { struct mac_biba *dest; dest = SLOT(cred->cr_label); biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL); biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 0, NULL); } static void biba_cred_create_swapper(struct ucred *cred) { struct mac_biba *dest; dest = SLOT(cred->cr_label); biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH, 0, NULL); } static void biba_cred_relabel(struct ucred *cred, struct label *newlabel) { struct mac_biba *source, *dest; source = SLOT(newlabel); dest = SLOT(cred->cr_label); biba_copy(source, dest); } static void biba_devfs_create_device(struct ucred *cred, struct mount *mp, struct cdev *dev, struct devfs_dirent *de, struct label *delabel) { struct mac_biba *mb; const char *dn; int biba_type; mb = SLOT(delabel); dn = devtoname(dev); if (strcmp(dn, "null") == 0 || strcmp(dn, "zero") == 0 || strcmp(dn, "random") == 0 || strncmp(dn, "fd/", strlen("fd/")) == 0) biba_type = MAC_BIBA_TYPE_EQUAL; else if (ptys_equal && (strncmp(dn, "ttyp", strlen("ttyp")) == 0 || strncmp(dn, "pts/", strlen("pts/")) == 0 || strncmp(dn, "ptyp", strlen("ptyp")) == 0)) biba_type = MAC_BIBA_TYPE_EQUAL; else biba_type = MAC_BIBA_TYPE_HIGH; biba_set_effective(mb, biba_type, 0, NULL); } static void biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen, struct devfs_dirent *de, struct label *delabel) { struct mac_biba *mb; mb = SLOT(delabel); biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL); } static void biba_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_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(delabel); biba_copy_effective(source, dest); } static void biba_devfs_update(struct mount *mp, struct devfs_dirent *de, struct label *delabel, struct vnode *vp, struct label *vplabel) { struct mac_biba *source, *dest; source = SLOT(vplabel); dest = SLOT(delabel); biba_copy(source, dest); } static void biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel, struct devfs_dirent *de, struct label *delabel, struct vnode *vp, struct label *vplabel) { struct mac_biba *source, *dest; source = SLOT(delabel); dest = SLOT(vplabel); biba_copy_effective(source, dest); } static int biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp, struct label *ifplabel, struct label *newlabel) { struct mac_biba *subj, *new; int error; subj = SLOT(cred->cr_label); new = SLOT(newlabel); /* * If there is a Biba label update for the interface, it may be an * update of the effective, range, or both. */ error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH); if (error) return (error); /* * Relabling network interfaces requires Biba privilege. */ error = biba_subject_privileged(subj); if (error) return (error); return (0); } static int biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *p, *i; if (!biba_enabled) return (0); p = SLOT(mlabel); i = SLOT(ifplabel); return (biba_effective_in_range(p, i) ? 0 : EACCES); } static void biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel) { char tifname[IFNAMSIZ], *p, *q; char tiflist[sizeof(trusted_interfaces)]; struct mac_biba *dest; int len, type; dest = SLOT(ifplabel); if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) { type = MAC_BIBA_TYPE_EQUAL; goto set; } if (trust_all_interfaces) { type = MAC_BIBA_TYPE_HIGH; goto set; } type = MAC_BIBA_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) { type = MAC_BIBA_TYPE_HIGH; break; } } else { *p = '\0'; printf("mac_biba warning: interface name " "\"%s\" is too long (must be < %d)\n", q, IFNAMSIZ); } if (*p == '\0') break; q = p + 1; } } set: biba_set_effective(dest, type, 0, NULL); biba_set_range(dest, type, 0, NULL, type, 0, NULL); } static void biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *source, *dest; source = SLOT(ifplabel); dest = SLOT(mlabel); biba_copy_effective(source, dest); } static void biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp, struct label *ifplabel, struct label *newlabel) { struct mac_biba *source, *dest; source = SLOT(newlabel); dest = SLOT(ifplabel); biba_copy(source, dest); } static int biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *p, *i; if (!biba_enabled) return (0); p = SLOT(mlabel); i = SLOT(inplabel); return (biba_equal_effective(p, i) ? 0 : EACCES); } static int biba_inpcb_check_visible(struct ucred *cred, struct inpcb *inp, struct label *inplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(inplabel); if (!biba_dominate_effective(obj, subj)) return (ENOENT); return (0); } static void biba_inpcb_create(struct socket *so, struct label *solabel, struct inpcb *inp, struct label *inplabel) { struct mac_biba *source, *dest; source = SLOT(solabel); dest = SLOT(inplabel); SOCK_LOCK(so); biba_copy_effective(source, dest); SOCK_UNLOCK(so); } static void biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *source, *dest; source = SLOT(inplabel); dest = SLOT(mlabel); biba_copy_effective(source, dest); } static void biba_inpcb_sosetlabel(struct socket *so, struct label *solabel, struct inpcb *inp, struct label *inplabel) { struct mac_biba *source, *dest; SOCK_LOCK_ASSERT(so); source = SLOT(solabel); dest = SLOT(inplabel); biba_copy(source, dest); } static void biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6, struct label *q6label) { struct mac_biba *source, *dest; source = SLOT(mlabel); dest = SLOT(q6label); biba_copy_effective(source, dest); } static int biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6, struct label *q6label) { struct mac_biba *a, *b; a = SLOT(q6label); b = SLOT(mlabel); return (biba_equal_effective(a, b)); } static void biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m, struct label *mlabel) { struct mac_biba *source, *dest; source = SLOT(q6label); dest = SLOT(mlabel); /* Just use the head, since we require them all to match. */ biba_copy_effective(source, dest); } static void biba_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 biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q, struct label *qlabel) { struct mac_biba *source, *dest; source = SLOT(mlabel); dest = SLOT(qlabel); biba_copy_effective(source, dest); } static int biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q, struct label *qlabel) { struct mac_biba *a, *b; a = SLOT(qlabel); b = SLOT(mlabel); return (biba_equal_effective(a, b)); } static void biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *source, *dest; source = SLOT(qlabel); dest = SLOT(mlabel); /* Just use the head, since we require them all to match. */ biba_copy_effective(source, dest); } static void biba_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 biba_kld_check_load(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; int error; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); error = biba_subject_privileged(subj); if (error) return (error); obj = SLOT(vplabel); if (!biba_high_effective(obj)) return (EACCES); return (0); } static int biba_mount_check_stat(struct ucred *cred, struct mount *mp, struct label *mplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(mplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static void biba_mount_create(struct ucred *cred, struct mount *mp, struct label *mplabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(mplabel); biba_copy_effective(source, dest); } static void biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *dest; dest = SLOT(mlabel); biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); } static void biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel, struct mbuf *msend, struct label *msendlabel) { struct mac_biba *source, *dest; source = SLOT(mrecvlabel); dest = SLOT(msendlabel); biba_copy_effective(source, dest); } static void biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel) { struct mac_biba *dest; dest = SLOT(mlabel); /* XXX: where is the label for the firewall really coming from? */ biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); } static void biba_netinet_fragment(struct mbuf *m, struct label *mlabel, struct mbuf *frag, struct label *fraglabel) { struct mac_biba *source, *dest; source = SLOT(mlabel); dest = SLOT(fraglabel); biba_copy_effective(source, dest); } static void biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel, struct mbuf *msend, struct label *msendlabel) { struct mac_biba *source, *dest; source = SLOT(mrecvlabel); dest = SLOT(msendlabel); biba_copy_effective(source, dest); } static void biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *dest; dest = SLOT(mlabel); biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); } static void biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *dest; dest = SLOT(mlabel); biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL); } static int biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp, struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data) { if(!biba_enabled) return (0); /* XXX: This will be implemented soon... */ return (0); } static int biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp, struct label *pplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(pplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_pipe_check_read(struct ucred *cred, struct pipepair *pp, struct label *pplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(pplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp, struct label *pplabel, struct label *newlabel) { struct mac_biba *subj, *obj, *new; int error; new = SLOT(newlabel); subj = SLOT(cred->cr_label); obj = SLOT(pplabel); /* * If there is a Biba label update for a pipe, it must be a effective * update. */ error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); if (error) return (error); /* * To perform a relabel of a pipe (Biba label or not), Biba must * authorize the relabel. */ if (!biba_effective_in_range(obj, subj)) return (EPERM); /* * If the Biba label is to be changed, authorize as appropriate. */ if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { /* * To change the Biba label on a pipe, the new pipe label * must be in the subject range. */ if (!biba_effective_in_range(new, subj)) return (EPERM); /* * To change the Biba label on a pipe to be EQUAL, the * subject must have appropriate privilege. */ if (biba_contains_equal(new)) { error = biba_subject_privileged(subj); if (error) return (error); } } return (0); } static int biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp, struct label *pplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(pplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_pipe_check_write(struct ucred *cred, struct pipepair *pp, struct label *pplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(pplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static void biba_pipe_create(struct ucred *cred, struct pipepair *pp, struct label *pplabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(pplabel); biba_copy_effective(source, dest); } static void biba_pipe_relabel(struct ucred *cred, struct pipepair *pp, struct label *pplabel, struct label *newlabel) { struct mac_biba *source, *dest; source = SLOT(newlabel); dest = SLOT(pplabel); biba_copy(source, dest); } static int biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks, struct label *kslabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(kslabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_posixsem_check_setmode(struct ucred *cred, struct ksem *ks, struct label *kslabel, mode_t mode) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(kslabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_posixsem_check_setowner(struct ucred *cred, struct ksem *ks, struct label *kslabel, uid_t uid, gid_t gid) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(kslabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred, struct ksem *ks, struct label *kslabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(kslabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred, struct ksem *ks, struct label *kslabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(kslabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static void biba_posixsem_create(struct ucred *cred, struct ksem *ks, struct label *kslabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(kslabel); biba_copy_effective(source, dest); } static int biba_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, struct label *shmlabel, int prot, int flags) { struct mac_biba *subj, *obj; if (!biba_enabled || !revocation_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(shmlabel); if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { if (!biba_dominate_effective(obj, subj)) return (EACCES); } if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { if (!biba_dominate_effective(subj, obj)) return (EACCES); } return (0); } static int biba_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd, struct label *shmlabel, accmode_t accmode) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(shmlabel); if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) { if (!biba_dominate_effective(obj, subj)) return (EACCES); } if (accmode & VMODIFY_PERMS) { if (!biba_dominate_effective(subj, obj)) return (EACCES); } return (0); } static int biba_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred, struct shmfd *vp, struct label *shmlabel) { struct mac_biba *subj, *obj; if (!biba_enabled || !revocation_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(shmlabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, struct label *shmlabel, mode_t mode) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(shmlabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, struct label *shmlabel, uid_t uid, gid_t gid) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(shmlabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred, struct shmfd *shmfd, struct label *shmlabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(shmlabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred, struct shmfd *shmfd, struct label *shmlabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(shmlabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd, struct label *shmlabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(shmlabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred, struct shmfd *vp, struct label *shmlabel) { struct mac_biba *subj, *obj; if (!biba_enabled || !revocation_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(shmlabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static void biba_posixshm_create(struct ucred *cred, struct shmfd *shmfd, struct label *shmlabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(shmlabel); biba_copy_effective(source, dest); } /* * Some system privileges are allowed regardless of integrity grade; others * are allowed only when running with privilege with respect to the Biba * policy as they might otherwise allow bypassing of the integrity policy. */ static int biba_priv_check(struct ucred *cred, int priv) { struct mac_biba *subj; int error; if (!biba_enabled) return (0); /* * Exempt only specific privileges from the Biba 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: case PRIV_SEEJAILPROC: 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: case PRIV_SCHED_IDPRIO: /* * 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 Biba policy. */ default: subj = SLOT(cred->cr_label); error = biba_subject_privileged(subj); if (error) return (error); } return (0); } static int biba_proc_check_debug(struct ucred *cred, struct proc *p) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(p->p_ucred->cr_label); /* XXX: range checks */ if (!biba_dominate_effective(obj, subj)) return (ESRCH); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_proc_check_sched(struct ucred *cred, struct proc *p) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(p->p_ucred->cr_label); /* XXX: range checks */ if (!biba_dominate_effective(obj, subj)) return (ESRCH); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(p->p_ucred->cr_label); /* XXX: range checks */ if (!biba_dominate_effective(obj, subj)) return (ESRCH); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_socket_check_deliver(struct socket *so, struct label *solabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *p, *s; int error; if (!biba_enabled) return (0); p = SLOT(mlabel); s = SLOT(solabel); SOCK_LOCK(so); error = biba_equal_effective(p, s) ? 0 : EACCES; SOCK_UNLOCK(so); return (error); } static int biba_socket_check_relabel(struct ucred *cred, struct socket *so, struct label *solabel, struct label *newlabel) { struct mac_biba *subj, *obj, *new; int error; SOCK_LOCK_ASSERT(so); new = SLOT(newlabel); subj = SLOT(cred->cr_label); obj = SLOT(solabel); /* * If there is a Biba label update for the socket, it may be an * update of effective. */ error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); if (error) return (error); /* * To relabel a socket, the old socket effective must be in the * subject range. */ if (!biba_effective_in_range(obj, subj)) return (EPERM); /* * If the Biba label is to be changed, authorize as appropriate. */ if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { /* * To relabel a socket, the new socket effective must be in * the subject range. */ if (!biba_effective_in_range(new, subj)) return (EPERM); /* * To change the Biba label on the socket to contain EQUAL, * the subject must have appropriate privilege. */ if (biba_contains_equal(new)) { error = biba_subject_privileged(subj); if (error) return (error); } } return (0); } static int biba_socket_check_visible(struct ucred *cred, struct socket *so, struct label *solabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(solabel); SOCK_LOCK(so); if (!biba_dominate_effective(obj, subj)) { SOCK_UNLOCK(so); return (ENOENT); } SOCK_UNLOCK(so); return (0); } static void biba_socket_create(struct ucred *cred, struct socket *so, struct label *solabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(solabel); biba_copy_effective(source, dest); } static void biba_socket_create_mbuf(struct socket *so, struct label *solabel, struct mbuf *m, struct label *mlabel) { struct mac_biba *source, *dest; source = SLOT(solabel); dest = SLOT(mlabel); SOCK_LOCK(so); biba_copy_effective(source, dest); SOCK_UNLOCK(so); } static void biba_socket_newconn(struct socket *oldso, struct label *oldsolabel, struct socket *newso, struct label *newsolabel) { struct mac_biba source, *dest; SOCK_LOCK(oldso); source = *SLOT(oldsolabel); SOCK_UNLOCK(oldso); dest = SLOT(newsolabel); SOCK_LOCK(newso); biba_copy_effective(&source, dest); SOCK_UNLOCK(newso); } static void biba_socket_relabel(struct ucred *cred, struct socket *so, struct label *solabel, struct label *newlabel) { struct mac_biba *source, *dest; SOCK_LOCK_ASSERT(so); source = SLOT(newlabel); dest = SLOT(solabel); biba_copy(source, dest); } static void biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel, struct socket *so, struct label *sopeerlabel) { struct mac_biba *source, *dest; source = SLOT(mlabel); dest = SLOT(sopeerlabel); SOCK_LOCK(so); biba_copy_effective(source, dest); SOCK_UNLOCK(so); } static void biba_socketpeer_set_from_socket(struct socket *oldso, struct label *oldsolabel, struct socket *newso, struct label *newsopeerlabel) { struct mac_biba source, *dest; SOCK_LOCK(oldso); source = *SLOT(oldsolabel); SOCK_UNLOCK(oldso); dest = SLOT(newsopeerlabel); SOCK_LOCK(newso); biba_copy_effective(&source, dest); SOCK_UNLOCK(newso); } static void biba_syncache_create(struct label *label, struct inpcb *inp) { struct mac_biba *source, *dest; source = SLOT(inp->inp_label); dest = SLOT(label); biba_copy_effective(source, dest); } static void biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m, struct label *mlabel) { struct mac_biba *source, *dest; source = SLOT(sc_label); dest = SLOT(mlabel); biba_copy_effective(source, dest); } static int biba_system_check_acct(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; int error; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); error = biba_subject_privileged(subj); if (error) return (error); if (vplabel == NULL) return (0); obj = SLOT(vplabel); if (!biba_high_effective(obj)) return (EACCES); return (0); } static int biba_system_check_auditctl(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; int error; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); error = biba_subject_privileged(subj); if (error) return (error); if (vplabel == NULL) return (0); obj = SLOT(vplabel); if (!biba_high_effective(obj)) return (EACCES); return (0); } static int biba_system_check_auditon(struct ucred *cred, int cmd) { struct mac_biba *subj; int error; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); error = biba_subject_privileged(subj); if (error) return (error); return (0); } static int biba_system_check_swapoff(struct ucred *cred, struct vnode *vp, struct label *label) { struct mac_biba *subj; int error; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); error = biba_subject_privileged(subj); if (error) return (error); return (0); } static int biba_system_check_swapon(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; int error; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); error = biba_subject_privileged(subj); if (error) return (error); if (!biba_high_effective(obj)) return (EACCES); return (0); } static int biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) { struct mac_biba *subj; int error; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); /* * Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high, * but also require privilege to change them. */ if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) { if (!biba_subject_dominate_high(subj)) return (EACCES); error = biba_subject_privileged(subj); if (error) return (error); } return (0); } static void biba_sysvmsg_cleanup(struct label *msglabel) { bzero(SLOT(msglabel), sizeof(struct mac_biba)); } static void biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr, struct label *msqlabel, struct msg *msgptr, struct label *msglabel) { struct mac_biba *source, *dest; /* Ignore the msgq label */ source = SLOT(cred->cr_label); dest = SLOT(msglabel); biba_copy_effective(source, dest); } static int biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr, struct label *msglabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(msglabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr, struct label *msglabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(msglabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr, struct label *msqklabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(msqklabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr, struct label *msqklabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(msqklabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr, struct label *msqklabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(msqklabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr, struct label *msqklabel, int cmd) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(msqklabel); switch(cmd) { case IPC_RMID: case IPC_SET: if (!biba_dominate_effective(subj, obj)) return (EACCES); break; case IPC_STAT: if (!biba_dominate_effective(obj, subj)) return (EACCES); break; default: return (EACCES); } return (0); } static void biba_sysvmsq_cleanup(struct label *msqlabel) { bzero(SLOT(msqlabel), sizeof(struct mac_biba)); } static void biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr, struct label *msqlabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(msqlabel); biba_copy_effective(source, dest); } static int biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr, struct label *semaklabel, int cmd) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(semaklabel); switch(cmd) { case IPC_RMID: case IPC_SET: case SETVAL: case SETALL: if (!biba_dominate_effective(subj, obj)) return (EACCES); break; case IPC_STAT: case GETVAL: case GETPID: case GETNCNT: case GETZCNT: case GETALL: if (!biba_dominate_effective(obj, subj)) return (EACCES); break; default: return (EACCES); } return (0); } static int biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr, struct label *semaklabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(semaklabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr, struct label *semaklabel, size_t accesstype) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(semaklabel); if (accesstype & SEM_R) if (!biba_dominate_effective(obj, subj)) return (EACCES); if (accesstype & SEM_A) if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static void biba_sysvsem_cleanup(struct label *semalabel) { bzero(SLOT(semalabel), sizeof(struct mac_biba)); } static void biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr, struct label *semalabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(semalabel); biba_copy_effective(source, dest); } static int biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr, struct label *shmseglabel, int shmflg) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(shmseglabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); if ((shmflg & SHM_RDONLY) == 0) { if (!biba_dominate_effective(subj, obj)) return (EACCES); } return (0); } static int biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr, struct label *shmseglabel, int cmd) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(shmseglabel); switch(cmd) { case IPC_RMID: case IPC_SET: if (!biba_dominate_effective(subj, obj)) return (EACCES); break; case IPC_STAT: case SHM_STAT: if (!biba_dominate_effective(obj, subj)) return (EACCES); break; default: return (EACCES); } return (0); } static int biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr, struct label *shmseglabel, int shmflg) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(shmseglabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static void biba_sysvshm_cleanup(struct label *shmlabel) { bzero(SLOT(shmlabel), sizeof(struct mac_biba)); } static void biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr, struct label *shmlabel) { struct mac_biba *source, *dest; source = SLOT(cred->cr_label); dest = SLOT(shmlabel); biba_copy_effective(source, dest); } static int biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel, struct vnode *vp, struct label *vplabel) { struct mac_biba mb_temp, *source, *dest; int buflen, error; source = SLOT(mplabel); dest = SLOT(vplabel); buflen = sizeof(mb_temp); bzero(&mb_temp, buflen); error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread); if (error == ENOATTR || error == EOPNOTSUPP) { /* Fall back to the mntlabel. */ biba_copy_effective(source, dest); return (0); } else if (error) return (error); if (buflen != sizeof(mb_temp)) { printf("biba_vnode_associate_extattr: bad size %d\n", buflen); return (EPERM); } if (biba_valid(&mb_temp) != 0) { printf("biba_vnode_associate_extattr: invalid\n"); return (EPERM); } if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_EFFECTIVE) { printf("biba_vnode_associate_extattr: not effective\n"); return (EPERM); } biba_copy_effective(&mb_temp, dest); return (0); } static void biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel, struct vnode *vp, struct label *vplabel) { struct mac_biba *source, *dest; source = SLOT(mplabel); dest = SLOT(vplabel); biba_copy_effective(source, dest); } static int biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, struct label *dvplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, struct label *dvplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_create(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct componentname *cnp, struct vattr *vap) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, struct label *vplabel, acl_type_t type) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, struct label *vplabel, int attrnamespace, const char *name) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_exec(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct image_params *imgp, struct label *execlabel) { struct mac_biba *subj, *obj, *exec; int error; if (execlabel != NULL) { /* * We currently don't permit labels to be changed at * exec-time as part of Biba, so disallow non-NULL Biba label * elements in the execlabel. */ exec = SLOT(execlabel); error = biba_atmostflags(exec, 0); if (error) return (error); } if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp, struct label *vplabel, acl_type_t type) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, struct label *vplabel, int attrnamespace, const char *name) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_link(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct vnode *vp, struct label *vplabel, struct componentname *cnp) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, struct label *vplabel, int attrnamespace) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct componentname *cnp) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp, struct label *vplabel, int prot, int flags) { struct mac_biba *subj, *obj; /* * Rely on the use of open()-time protections to handle * non-revocation cases. */ if (!biba_enabled || !revocation_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { if (!biba_dominate_effective(obj, subj)) return (EACCES); } if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) { if (!biba_dominate_effective(subj, obj)) return (EACCES); } return (0); } static int biba_vnode_check_open(struct ucred *cred, struct vnode *vp, struct label *vplabel, accmode_t accmode) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); /* XXX privilege override for admin? */ if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) { if (!biba_dominate_effective(obj, subj)) return (EACCES); } if (accmode & VMODIFY_PERMS) { if (!biba_dominate_effective(subj, obj)) return (EACCES); } return (0); } static int biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; if (!biba_enabled || !revocation_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; if (!biba_enabled || !revocation_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, struct label *dvplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct label *newlabel) { struct mac_biba *old, *new, *subj; int error; old = SLOT(vplabel); new = SLOT(newlabel); subj = SLOT(cred->cr_label); /* * If there is a Biba label update for the vnode, it must be a * effective label. */ error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE); if (error) return (error); /* * To perform a relabel of the vnode (Biba label or not), Biba must * authorize the relabel. */ if (!biba_effective_in_range(old, subj)) return (EPERM); /* * If the Biba label is to be changed, authorize as appropriate. */ if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) { /* * To change the Biba label on a vnode, the new vnode label * must be in the subject range. */ if (!biba_effective_in_range(new, subj)) return (EPERM); /* * To change the Biba label on the vnode to be EQUAL, the * subject must have appropriate privilege. */ if (biba_contains_equal(new)) { error = biba_subject_privileged(subj); if (error) return (error); } } return (0); } static int biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct vnode *vp, struct label *vplabel, struct componentname *cnp) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_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_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); if (vp != NULL) { obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); } return (0); } static int biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp, struct label *vplabel, acl_type_t type, struct acl *acl) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, struct label *vplabel, int attrnamespace, const char *name) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); /* XXX: protect the MAC EA in a special way? */ return (0); } static int biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp, struct label *vplabel, u_long flags) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp, struct label *vplabel, mode_t mode) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp, struct label *vplabel, uid_t uid, gid_t gid) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct timespec atime, struct timespec mtime) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(obj, subj)) return (EACCES); return (0); } static int biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, struct label *dvplabel, struct vnode *vp, struct label *vplabel, struct componentname *cnp) { struct mac_biba *subj, *obj; if (!biba_enabled) return (0); subj = SLOT(cred->cr_label); obj = SLOT(dvplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred, struct vnode *vp, struct label *vplabel) { struct mac_biba *subj, *obj; if (!biba_enabled || !revocation_enabled) return (0); subj = SLOT(active_cred->cr_label); obj = SLOT(vplabel); if (!biba_dominate_effective(subj, obj)) return (EACCES); return (0); } static int biba_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_biba *source, *dest, mb_temp; size_t buflen; int error; buflen = sizeof(mb_temp); bzero(&mb_temp, buflen); source = SLOT(cred->cr_label); dest = SLOT(vplabel); biba_copy_effective(source, &mb_temp); error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); if (error == 0) biba_copy_effective(source, dest); return (error); } static void biba_vnode_relabel(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct label *newlabel) { struct mac_biba *source, *dest; source = SLOT(newlabel); dest = SLOT(vplabel); biba_copy(source, dest); } static int biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp, struct label *vplabel, struct label *intlabel) { struct mac_biba *source, mb_temp; size_t buflen; int error; buflen = sizeof(mb_temp); bzero(&mb_temp, buflen); source = SLOT(intlabel); if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0) return (0); biba_copy_effective(source, &mb_temp); error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE, MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread); return (error); } static struct mac_policy_ops mac_biba_ops = { .mpo_init = biba_init, .mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive, .mpo_bpfdesc_create = biba_bpfdesc_create, .mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf, .mpo_bpfdesc_destroy_label = biba_destroy_label, .mpo_bpfdesc_init_label = biba_init_label, .mpo_cred_associate_nfsd = biba_cred_associate_nfsd, .mpo_cred_check_relabel = biba_cred_check_relabel, .mpo_cred_check_visible = biba_cred_check_visible, .mpo_cred_copy_label = biba_copy_label, .mpo_cred_create_init = biba_cred_create_init, .mpo_cred_create_swapper = biba_cred_create_swapper, .mpo_cred_destroy_label = biba_destroy_label, .mpo_cred_externalize_label = biba_externalize_label, .mpo_cred_init_label = biba_init_label, .mpo_cred_internalize_label = biba_internalize_label, .mpo_cred_relabel = biba_cred_relabel, .mpo_devfs_create_device = biba_devfs_create_device, .mpo_devfs_create_directory = biba_devfs_create_directory, .mpo_devfs_create_symlink = biba_devfs_create_symlink, .mpo_devfs_destroy_label = biba_destroy_label, .mpo_devfs_init_label = biba_init_label, .mpo_devfs_update = biba_devfs_update, .mpo_devfs_vnode_associate = biba_devfs_vnode_associate, .mpo_ifnet_check_relabel = biba_ifnet_check_relabel, .mpo_ifnet_check_transmit = biba_ifnet_check_transmit, .mpo_ifnet_copy_label = biba_copy_label, .mpo_ifnet_create = biba_ifnet_create, .mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf, .mpo_ifnet_destroy_label = biba_destroy_label, .mpo_ifnet_externalize_label = biba_externalize_label, .mpo_ifnet_init_label = biba_init_label, .mpo_ifnet_internalize_label = biba_internalize_label, .mpo_ifnet_relabel = biba_ifnet_relabel, .mpo_inpcb_check_deliver = biba_inpcb_check_deliver, .mpo_inpcb_check_visible = biba_inpcb_check_visible, .mpo_inpcb_create = biba_inpcb_create, .mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf, .mpo_inpcb_destroy_label = biba_destroy_label, .mpo_inpcb_init_label = biba_init_label_waitcheck, .mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel, .mpo_ip6q_create = biba_ip6q_create, .mpo_ip6q_destroy_label = biba_destroy_label, .mpo_ip6q_init_label = biba_init_label_waitcheck, .mpo_ip6q_match = biba_ip6q_match, .mpo_ip6q_reassemble = biba_ip6q_reassemble, .mpo_ip6q_update = biba_ip6q_update, .mpo_ipq_create = biba_ipq_create, .mpo_ipq_destroy_label = biba_destroy_label, .mpo_ipq_init_label = biba_init_label_waitcheck, .mpo_ipq_match = biba_ipq_match, .mpo_ipq_reassemble = biba_ipq_reassemble, .mpo_ipq_update = biba_ipq_update, .mpo_kld_check_load = biba_kld_check_load, .mpo_mbuf_copy_label = biba_copy_label, .mpo_mbuf_destroy_label = biba_destroy_label, .mpo_mbuf_init_label = biba_init_label_waitcheck, .mpo_mount_check_stat = biba_mount_check_stat, .mpo_mount_create = biba_mount_create, .mpo_mount_destroy_label = biba_destroy_label, .mpo_mount_init_label = biba_init_label, .mpo_netinet_arp_send = biba_netinet_arp_send, .mpo_netinet_firewall_reply = biba_netinet_firewall_reply, .mpo_netinet_firewall_send = biba_netinet_firewall_send, .mpo_netinet_fragment = biba_netinet_fragment, .mpo_netinet_icmp_reply = biba_netinet_icmp_reply, .mpo_netinet_igmp_send = biba_netinet_igmp_send, .mpo_netinet6_nd6_send = biba_netinet6_nd6_send, .mpo_pipe_check_ioctl = biba_pipe_check_ioctl, .mpo_pipe_check_poll = biba_pipe_check_poll, .mpo_pipe_check_read = biba_pipe_check_read, .mpo_pipe_check_relabel = biba_pipe_check_relabel, .mpo_pipe_check_stat = biba_pipe_check_stat, .mpo_pipe_check_write = biba_pipe_check_write, .mpo_pipe_copy_label = biba_copy_label, .mpo_pipe_create = biba_pipe_create, .mpo_pipe_destroy_label = biba_destroy_label, .mpo_pipe_externalize_label = biba_externalize_label, .mpo_pipe_init_label = biba_init_label, .mpo_pipe_internalize_label = biba_internalize_label, .mpo_pipe_relabel = biba_pipe_relabel, .mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly, .mpo_posixsem_check_open = biba_posixsem_check_openunlink, .mpo_posixsem_check_post = biba_posixsem_check_write, .mpo_posixsem_check_setmode = biba_posixsem_check_setmode, .mpo_posixsem_check_setowner = biba_posixsem_check_setowner, .mpo_posixsem_check_stat = biba_posixsem_check_rdonly, .mpo_posixsem_check_unlink = biba_posixsem_check_openunlink, .mpo_posixsem_check_wait = biba_posixsem_check_write, .mpo_posixsem_create = biba_posixsem_create, .mpo_posixsem_destroy_label = biba_destroy_label, .mpo_posixsem_init_label = biba_init_label, .mpo_posixshm_check_mmap = biba_posixshm_check_mmap, .mpo_posixshm_check_open = biba_posixshm_check_open, .mpo_posixshm_check_read = biba_posixshm_check_read, .mpo_posixshm_check_setmode = biba_posixshm_check_setmode, .mpo_posixshm_check_setowner = biba_posixshm_check_setowner, .mpo_posixshm_check_stat = biba_posixshm_check_stat, .mpo_posixshm_check_truncate = biba_posixshm_check_truncate, .mpo_posixshm_check_unlink = biba_posixshm_check_unlink, .mpo_posixshm_check_write = biba_posixshm_check_write, .mpo_posixshm_create = biba_posixshm_create, .mpo_posixshm_destroy_label = biba_destroy_label, .mpo_posixshm_init_label = biba_init_label, .mpo_priv_check = biba_priv_check, .mpo_proc_check_debug = biba_proc_check_debug, .mpo_proc_check_sched = biba_proc_check_sched, .mpo_proc_check_signal = biba_proc_check_signal, .mpo_socket_check_deliver = biba_socket_check_deliver, .mpo_socket_check_relabel = biba_socket_check_relabel, .mpo_socket_check_visible = biba_socket_check_visible, .mpo_socket_copy_label = biba_copy_label, .mpo_socket_create = biba_socket_create, .mpo_socket_create_mbuf = biba_socket_create_mbuf, .mpo_socket_destroy_label = biba_destroy_label, .mpo_socket_externalize_label = biba_externalize_label, .mpo_socket_init_label = biba_init_label_waitcheck, .mpo_socket_internalize_label = biba_internalize_label, .mpo_socket_newconn = biba_socket_newconn, .mpo_socket_relabel = biba_socket_relabel, .mpo_socketpeer_destroy_label = biba_destroy_label, .mpo_socketpeer_externalize_label = biba_externalize_label, .mpo_socketpeer_init_label = biba_init_label_waitcheck, .mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf, .mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket, .mpo_syncache_create = biba_syncache_create, .mpo_syncache_create_mbuf = biba_syncache_create_mbuf, .mpo_syncache_destroy_label = biba_destroy_label, .mpo_syncache_init_label = biba_init_label_waitcheck, .mpo_system_check_acct = biba_system_check_acct, .mpo_system_check_auditctl = biba_system_check_auditctl, .mpo_system_check_auditon = biba_system_check_auditon, .mpo_system_check_swapoff = biba_system_check_swapoff, .mpo_system_check_swapon = biba_system_check_swapon, .mpo_system_check_sysctl = biba_system_check_sysctl, .mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup, .mpo_sysvmsg_create = biba_sysvmsg_create, .mpo_sysvmsg_destroy_label = biba_destroy_label, .mpo_sysvmsg_init_label = biba_init_label, .mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv, .mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid, .mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget, .mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd, .mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv, .mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl, .mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup, .mpo_sysvmsq_create = biba_sysvmsq_create, .mpo_sysvmsq_destroy_label = biba_destroy_label, .mpo_sysvmsq_init_label = biba_init_label, .mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl, .mpo_sysvsem_check_semget = biba_sysvsem_check_semget, .mpo_sysvsem_check_semop = biba_sysvsem_check_semop, .mpo_sysvsem_cleanup = biba_sysvsem_cleanup, .mpo_sysvsem_create = biba_sysvsem_create, .mpo_sysvsem_destroy_label = biba_destroy_label, .mpo_sysvsem_init_label = biba_init_label, .mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat, .mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl, .mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget, .mpo_sysvshm_cleanup = biba_sysvshm_cleanup, .mpo_sysvshm_create = biba_sysvshm_create, .mpo_sysvshm_destroy_label = biba_destroy_label, .mpo_sysvshm_init_label = biba_init_label, .mpo_vnode_associate_extattr = biba_vnode_associate_extattr, .mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel, .mpo_vnode_check_access = biba_vnode_check_open, .mpo_vnode_check_chdir = biba_vnode_check_chdir, .mpo_vnode_check_chroot = biba_vnode_check_chroot, .mpo_vnode_check_create = biba_vnode_check_create, .mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl, .mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr, .mpo_vnode_check_exec = biba_vnode_check_exec, .mpo_vnode_check_getacl = biba_vnode_check_getacl, .mpo_vnode_check_getextattr = biba_vnode_check_getextattr, .mpo_vnode_check_link = biba_vnode_check_link, .mpo_vnode_check_listextattr = biba_vnode_check_listextattr, .mpo_vnode_check_lookup = biba_vnode_check_lookup, .mpo_vnode_check_mmap = biba_vnode_check_mmap, .mpo_vnode_check_open = biba_vnode_check_open, .mpo_vnode_check_poll = biba_vnode_check_poll, .mpo_vnode_check_read = biba_vnode_check_read, .mpo_vnode_check_readdir = biba_vnode_check_readdir, .mpo_vnode_check_readlink = biba_vnode_check_readlink, .mpo_vnode_check_relabel = biba_vnode_check_relabel, .mpo_vnode_check_rename_from = biba_vnode_check_rename_from, .mpo_vnode_check_rename_to = biba_vnode_check_rename_to, .mpo_vnode_check_revoke = biba_vnode_check_revoke, .mpo_vnode_check_setacl = biba_vnode_check_setacl, .mpo_vnode_check_setextattr = biba_vnode_check_setextattr, .mpo_vnode_check_setflags = biba_vnode_check_setflags, .mpo_vnode_check_setmode = biba_vnode_check_setmode, .mpo_vnode_check_setowner = biba_vnode_check_setowner, .mpo_vnode_check_setutimes = biba_vnode_check_setutimes, .mpo_vnode_check_stat = biba_vnode_check_stat, .mpo_vnode_check_unlink = biba_vnode_check_unlink, .mpo_vnode_check_write = biba_vnode_check_write, .mpo_vnode_create_extattr = biba_vnode_create_extattr, .mpo_vnode_copy_label = biba_copy_label, .mpo_vnode_destroy_label = biba_destroy_label, .mpo_vnode_externalize_label = biba_externalize_label, .mpo_vnode_init_label = biba_init_label, .mpo_vnode_internalize_label = biba_internalize_label, .mpo_vnode_relabel = biba_vnode_relabel, .mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr, }; MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba", MPC_LOADTIME_FLAG_NOTLATE, &biba_slot);