FreeBSD/Linux Kernel Cross Reference
sys/security/mac_process.c

     /*
      * 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 <string.h>
    #include <sys/param.h>
    #include <sys/ucred.h>
    #include <sys/malloc.h>
    #include <sys/sbuf.h>
    #include <sys/vnode.h>
    #include <sys/proc.h>
    #include <sys/proc_internal.h>
    #include <sys/kauth.h>
    #include <sys/imgact.h>
    #include <mach/mach_types.h>
    
    #include <security/mac_internal.h>
    #include <security/mac_mach_internal.h>
    
    #include <bsd/security/audit/audit.h>
    
    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 <mach/vm_prot.h>). 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);
   }
   
   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));
   }

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