/* * Copyright (c) 2007-2010 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /*- * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson * Copyright (c) 2001 Ilmar S. Habibulin * Copyright (c) 2001, 2002, 2003, 2004 Networks Associates Technology, Inc. * * This software was developed by Robert Watson and Ilmar Habibulin for the * TrustedBSD Project. * * This software was developed for the FreeBSD Project in part by Network * Associates Laboratories, the Security Research Division of Network * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), * as part of the DARPA CHATS research program. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 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. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct label * mac_cred_label_alloc(void) { struct label *label; label = mac_labelzone_alloc(MAC_WAITOK); if (label == NULL) return (NULL); MAC_PERFORM(cred_label_init, label); return (label); } void mac_cred_label_init(struct ucred *cred) { cred->cr_label = mac_cred_label_alloc(); } void mac_cred_label_free(struct label *label) { MAC_PERFORM(cred_label_destroy, label); mac_labelzone_free(label); } int mac_cred_label_compare(struct label *a, struct label *b) { return (bcmp(a, b, sizeof (*a)) == 0); } int mac_cred_label_externalize_audit(struct proc *p, struct mac *mac) { kauth_cred_t cr; int error; cr = kauth_cred_proc_ref(p); error = MAC_EXTERNALIZE_AUDIT(cred, cr->cr_label, mac->m_string, mac->m_buflen); kauth_cred_unref(&cr); return (error); } void mac_cred_label_destroy(kauth_cred_t cred) { mac_cred_label_free(cred->cr_label); cred->cr_label = NULL; } int mac_cred_label_externalize(struct label *label, char *elements, char *outbuf, size_t outbuflen, int flags __unused) { int error = 0; error = MAC_EXTERNALIZE(cred, label, elements, outbuf, outbuflen); return (error); } int mac_cred_label_internalize(struct label *label, char *string) { int error; error = MAC_INTERNALIZE(cred, label, string); return (error); } /* * By default, fork just adds a reference to the parent * credential. Policies may need to know about this reference * if they are tracking exit calls to know when to free the * label. */ void mac_cred_label_associate_fork(kauth_cred_t cred, proc_t proc) { MAC_PERFORM(cred_label_associate_fork, cred, proc); } /* * Initialize MAC label for the first kernel process, from which other * kernel processes and threads are spawned. */ void mac_cred_label_associate_kernel(kauth_cred_t cred) { MAC_PERFORM(cred_label_associate_kernel, cred); } /* * Initialize MAC label for the first userland process, from which other * userland processes and threads are spawned. */ void mac_cred_label_associate_user(kauth_cred_t cred) { MAC_PERFORM(cred_label_associate_user, cred); } /* * When a new process is created, its label must be initialized. Generally, * this involves inheritence from the parent process, modulo possible * deltas. This function allows that processing to take place. */ void mac_cred_label_associate(struct ucred *parent_cred, struct ucred *child_cred) { MAC_PERFORM(cred_label_associate, parent_cred, child_cred); } int mac_execve_enter(user_addr_t mac_p, struct image_params *imgp) { struct user_mac mac; struct label *execlabel; char *buffer; int error; size_t ulen; if (mac_p == USER_ADDR_NULL) return (0); if (IS_64BIT_PROCESS(current_proc())) { struct user64_mac mac64; error = copyin(mac_p, &mac64, sizeof(mac64)); mac.m_buflen = mac64.m_buflen; mac.m_string = mac64.m_string; } else { struct user32_mac mac32; error = copyin(mac_p, &mac32, sizeof(mac32)); mac.m_buflen = mac32.m_buflen; mac.m_string = mac32.m_string; } if (error) return (error); error = mac_check_structmac_consistent(&mac); if (error) return (error); execlabel = mac_cred_label_alloc(); MALLOC(buffer, char *, mac.m_buflen, M_MACTEMP, M_WAITOK); error = copyinstr(CAST_USER_ADDR_T(mac.m_string), buffer, mac.m_buflen, &ulen); if (error) goto out; AUDIT_ARG(mac_string, buffer); error = mac_cred_label_internalize(execlabel, buffer); out: if (error) { mac_cred_label_free(execlabel); execlabel = NULL; } imgp->ip_execlabelp = execlabel; FREE(buffer, M_MACTEMP); return (error); } /* * When the subject's label changes, it may require revocation of privilege * to mapped objects. This can't be done on-the-fly later with a unified * buffer cache. * * XXX: CRF_MAC_ENFORCE should be in a kauth_cred_t field, rather * XXX: than a posix_cred_t field. */ void mac_cred_label_update(kauth_cred_t cred, struct label *newlabel) { posix_cred_t pcred = posix_cred_get(cred); /* force label to be part of "matching" for credential */ pcred->cr_flags |= CRF_MAC_ENFORCE; /* inform the policies of the update */ MAC_PERFORM(cred_label_update, cred, newlabel); } int mac_cred_check_label_update(kauth_cred_t cred, struct label *newlabel) { int error; if (!mac_proc_enforce) return (0); MAC_CHECK(cred_check_label_update, cred, newlabel); return (error); } int mac_cred_check_visible(kauth_cred_t u1, kauth_cred_t u2) { int error; if (!mac_proc_enforce) return (0); MAC_CHECK(cred_check_visible, u1, u2); return (error); } /* * called with process locked. */ void mac_proc_set_enforce(proc_t p, int enforce_flags) { p->p_mac_enforce |= enforce_flags; } int mac_proc_check_debug(proc_t curp, struct proc *proc) { kauth_cred_t cred; int error; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_debug, cred, proc); kauth_cred_unref(&cred); return (error); } int mac_proc_check_fork(proc_t curp) { kauth_cred_t cred; int error; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_fork, cred, curp); kauth_cred_unref(&cred); return (error); } int mac_proc_check_get_task_name(struct ucred *cred, struct proc *p) { int error; MAC_CHECK(proc_check_get_task_name, cred, p); return (error); } int mac_proc_check_get_task(struct ucred *cred, struct proc *p) { int error; MAC_CHECK(proc_check_get_task, cred, p); return (error); } /* * The type of maxprot in proc_check_map_anon must be equivalent to vm_prot_t * (defined in ). mac_policy.h does not include any header * files, so cannot use the typedef itself. */ int mac_proc_check_map_anon(proc_t proc, user_addr_t u_addr, user_size_t u_size, int prot, int flags, int *maxprot) { kauth_cred_t cred; int error; if (!mac_vm_enforce || !mac_proc_check_enforce(proc, MAC_VM_ENFORCE)) return (0); cred = kauth_cred_proc_ref(proc); MAC_CHECK(proc_check_map_anon, proc, cred, u_addr, u_size, prot, flags, maxprot); kauth_cred_unref(&cred); return (error); } int mac_proc_check_mprotect(proc_t proc, user_addr_t addr, user_size_t size, int prot) { kauth_cred_t cred; int error; if (!mac_vm_enforce || !mac_proc_check_enforce(proc, MAC_VM_ENFORCE)) return (0); cred = kauth_cred_proc_ref(proc); MAC_CHECK(proc_check_mprotect, cred, proc, addr, size, prot); kauth_cred_unref(&cred); return (error); } int mac_proc_check_run_cs_invalid(proc_t proc) { int error; if (!mac_vm_enforce) return (0); MAC_CHECK(proc_check_run_cs_invalid, proc); return (error); } int mac_proc_check_sched(proc_t curp, struct proc *proc) { kauth_cred_t cred; int error; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_sched, cred, proc); kauth_cred_unref(&cred); return (error); } int mac_proc_check_signal(proc_t curp, struct proc *proc, int signum) { kauth_cred_t cred; int error; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_signal, cred, proc, signum); kauth_cred_unref(&cred); return (error); } int mac_proc_check_wait(proc_t curp, struct proc *proc) { kauth_cred_t cred; int error; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_wait, cred, proc); kauth_cred_unref(&cred); return (error); } #if CONFIG_LCTX /* * Login Context */ int mac_proc_check_setlcid (struct proc *p0, struct proc *p, pid_t pid, pid_t lcid) { int error; if (!mac_proc_enforce || !mac_proc_check_enforce(p0, MAC_PROC_ENFORCE)) return (0); MAC_CHECK(proc_check_setlcid, p0, p, pid, lcid); return (error); } int mac_proc_check_getlcid (struct proc *p0, struct proc *p, pid_t pid) { int error; if (!mac_proc_enforce || !mac_proc_check_enforce(p0, MAC_PROC_ENFORCE)) return (0); MAC_CHECK(proc_check_getlcid, p0, p, pid); return (error); } void mac_lctx_notify_create (struct proc *p, struct lctx *l) { MAC_PERFORM(lctx_notify_create, p, l); } void mac_lctx_notify_join (struct proc *p, struct lctx *l) { MAC_PERFORM(lctx_notify_join, p, l); } void mac_lctx_notify_leave (struct proc *p, struct lctx *l) { MAC_PERFORM(lctx_notify_leave, p, l); } struct label * mac_lctx_label_alloc(void) { struct label *label; label = mac_labelzone_alloc(MAC_WAITOK); if (label == NULL) return (NULL); MAC_PERFORM(lctx_label_init, label); return (label); } void mac_lctx_label_free(struct label *label) { MAC_PERFORM(lctx_label_destroy, label); mac_labelzone_free(label); } int mac_lctx_label_externalize(struct label *label, char *elements, char *outbuf, size_t outbuflen) { int error; error = MAC_EXTERNALIZE(lctx, label, elements, outbuf, outbuflen); return (error); } int mac_lctx_label_internalize(struct label *label, char *string) { int error; error = MAC_INTERNALIZE(lctx, label, string); return (error); } void mac_lctx_label_update(struct lctx *l, struct label *newlabel) { MAC_PERFORM(lctx_label_update, l, newlabel); } int mac_lctx_check_label_update(struct lctx *l, struct label *newlabel) { int error; MAC_CHECK(lctx_check_label_update, l, newlabel); return (error); } #endif /* LCTX */ int mac_proc_check_suspend_resume(proc_t curp, int sr) { kauth_cred_t cred; int error; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_suspend_resume, cred, curp, sr); kauth_cred_unref(&cred); return (error); } int mac_proc_check_ledger(proc_t curp, proc_t proc, int ledger_op) { kauth_cred_t cred; int error = 0; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_ledger, cred, proc, ledger_op); kauth_cred_unref(&cred); return (error); } int mac_proc_check_cpumon(proc_t curp) { kauth_cred_t cred; int error = 0; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_cpumon, cred); kauth_cred_unref(&cred); return (error); } int mac_proc_check_proc_info(proc_t curp, proc_t target, int callnum, int flavor) { kauth_cred_t cred; int error = 0; if (!mac_proc_enforce || !mac_proc_check_enforce(curp, MAC_PROC_ENFORCE)) return (0); cred = kauth_cred_proc_ref(curp); MAC_CHECK(proc_check_proc_info, cred, target, callnum, flavor); kauth_cred_unref(&cred); return (error); } struct label * mac_thread_label_alloc(void) { struct label *label; label = mac_labelzone_alloc(MAC_WAITOK); if (label == NULL) return (NULL); MAC_PERFORM(thread_label_init, label); return (label); } void mac_thread_label_init(struct uthread *uthread) { uthread->uu_label = mac_thread_label_alloc(); } void mac_thread_label_free(struct label *label) { MAC_PERFORM(thread_label_destroy, label); mac_labelzone_free(label); } void mac_thread_label_destroy(struct uthread *uthread) { mac_thread_label_free(uthread->uu_label); uthread->uu_label = NULL; } void mac_thread_userret(struct thread *td) { MAC_PERFORM(thread_userret, td); } struct label * mac_thread_get_uthreadlabel(struct uthread *uthread) { return (uthread->uu_label); } struct label * mac_thread_get_threadlabel(struct thread *thread) { struct uthread *uthread = get_bsdthread_info(thread); return (mac_thread_get_uthreadlabel(uthread)); }