X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0c530ab8987f0ae6a1a3d9284f40182b88852816..2d21ac55c334faf3a56e5634905ed6987fc787d4:/security/mac_process.c diff --git a/security/mac_process.c b/security/mac_process.c new file mode 100644 index 000000000..20ca2fb64 --- /dev/null +++ b/security/mac_process.c @@ -0,0 +1,542 @@ +/* + * Copyright (c) 2007 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 + +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_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())) { + error = copyin(mac_p, &mac, sizeof(mac)); + } else { + struct mac mac32; + error = copyin(mac_p, &mac32, sizeof(mac32)); + mac.m_buflen = mac32.m_buflen; + mac.m_string = CAST_USER_ADDR_T(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. + */ +void +mac_cred_label_update(kauth_cred_t cred, struct label *newlabel) +{ + + /* force label to be part of "matching" for credential */ + cred->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); +} + +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_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 */ + + +void +mac_thread_userret(int code, int error, struct thread *thread) +{ + + if (mac_late) + MAC_PERFORM(thread_userret, code, error, thread); +}