FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_cred.c

     /*-
      * Copyright (c) 1999-2002, 2008-2009 Robert N. M. Watson
      * Copyright (c) 2001 Ilmar S. Habibulin
      * Copyright (c) 2001-2003 Networks Associates Technology, Inc.
      * Copyright (c) 2005 Samy Al Bahra
      * Copyright (c) 2006 SPARTA, Inc.
      * Copyright (c) 2008 Apple Inc.
      * All rights reserved.
      *
     * 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.
     *
     * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.0/sys/security/mac/mac_cred.c 299187 2016-05-06 16:59:04Z pfg $");
    
    #include "opt_mac.h"
    
    #include <sys/param.h>
    #include <sys/condvar.h>
    #include <sys/imgact.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/mac.h>
    #include <sys/proc.h>
    #include <sys/sbuf.h>
    #include <sys/sdt.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/file.h>
    #include <sys/namei.h>
    #include <sys/sysctl.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <vm/vm_map.h>
    #include <vm/vm_object.h>
    
    #include <security/mac/mac_framework.h>
    #include <security/mac/mac_internal.h>
    #include <security/mac/mac_policy.h>
    
    struct label *
    mac_cred_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_POLICY_PERFORM(cred_init_label, label);
            return (label);
    }
    
    void
    mac_cred_init(struct ucred *cred)
    {
    
            if (mac_labeled & MPC_OBJECT_CRED)
                    cred->cr_label = mac_cred_label_alloc();
            else
                    cred->cr_label = NULL;
    }
    
    void
    mac_cred_label_free(struct label *label)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(cred_destroy_label, label);
           mac_labelzone_free(label);
   }
   
   void
   mac_cred_destroy(struct ucred *cred)
   {
   
           if (cred->cr_label != NULL) {
                   mac_cred_label_free(cred->cr_label);
                   cred->cr_label = NULL;
           }
   }
   
   /*
    * When a thread becomes an NFS server daemon, its credential may need to be
    * updated to reflect this so that policies can recognize when file system
    * operations originate from the network.
    *
    * At some point, it would be desirable if the credential used for each NFS
    * RPC could be set based on the RPC context (i.e., source system, etc) to
    * provide more fine-grained access control.
    */
   void
   mac_cred_associate_nfsd(struct ucred *cred)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(cred_associate_nfsd, cred);
   }
   
   /*
    * Initialize MAC label for the first kernel process, from which other kernel
    * processes and threads are spawned.
    */
   void
   mac_cred_create_swapper(struct ucred *cred)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(cred_create_swapper, cred);
   }
   
   /*
    * Initialize MAC label for the first userland process, from which other
    * userland processes and threads are spawned.
    */
   void
   mac_cred_create_init(struct ucred *cred)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(cred_create_init, cred);
   }
   
   int
   mac_cred_externalize_label(struct label *label, char *elements,
       char *outbuf, size_t outbuflen)
   {
           int error;
   
           MAC_POLICY_EXTERNALIZE(cred, label, elements, outbuf, outbuflen);
   
           return (error);
   }
   
   int
   mac_cred_internalize_label(struct label *label, char *string)
   {
           int error;
   
           MAC_POLICY_INTERNALIZE(cred, label, string);
   
           return (error);
   }
   
   /*
    * When a new process is created, its label must be initialized.  Generally,
    * this involves inheritance from the parent process, modulo possible deltas.
    * This function allows that processing to take place.
    */
   void
   mac_cred_copy(struct ucred *src, struct ucred *dest)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(cred_copy_label, src->cr_label,
               dest->cr_label);
   }
   
   /*
    * 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_relabel(struct ucred *cred, struct label *newlabel)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(cred_relabel, cred, newlabel);
   }
   
   MAC_CHECK_PROBE_DEFINE2(cred_check_relabel, "struct ucred *",
       "struct label *");
   
   int
   mac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_relabel, cred, newlabel);
           MAC_CHECK_PROBE2(cred_check_relabel, error, cred, newlabel);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(cred_check_setuid, "struct ucred *", "uid_t");
   
   int
   mac_cred_check_setuid(struct ucred *cred, uid_t uid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_setuid, cred, uid);
           MAC_CHECK_PROBE2(cred_check_setuid, error, cred, uid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(cred_check_seteuid, "struct ucred *", "uid_t");
   
   int
   mac_cred_check_seteuid(struct ucred *cred, uid_t euid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_seteuid, cred, euid);
           MAC_CHECK_PROBE2(cred_check_seteuid, error, cred, euid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(cred_check_setgid, "struct ucred *", "gid_t");
   
   int
   mac_cred_check_setgid(struct ucred *cred, gid_t gid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_setgid, cred, gid);
           MAC_CHECK_PROBE2(cred_check_setgid, error, cred, gid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(cred_check_setegid, "struct ucred *", "gid_t");
   
   int
   mac_cred_check_setegid(struct ucred *cred, gid_t egid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_setegid, cred, egid);
           MAC_CHECK_PROBE2(cred_check_setegid, error, cred, egid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(cred_check_setgroups, "struct ucred *", "int",
       "gid_t *");
   
   int
   mac_cred_check_setgroups(struct ucred *cred, int ngroups, gid_t *gidset)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_setgroups, cred, ngroups, gidset);
           MAC_CHECK_PROBE3(cred_check_setgroups, error, cred, ngroups, gidset);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(cred_check_setreuid, "struct ucred *", "uid_t",
       "uid_t");
   
   int
   mac_cred_check_setreuid(struct ucred *cred, uid_t ruid, uid_t euid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_setreuid, cred, ruid, euid);
           MAC_CHECK_PROBE3(cred_check_setreuid, error, cred, ruid, euid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(cred_check_setregid, "struct ucred *", "gid_t",
       "gid_t");
   
   int
   mac_cred_check_setregid(struct ucred *cred, gid_t rgid, gid_t egid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_setregid, cred, rgid, egid);
           MAC_CHECK_PROBE3(cred_check_setregid, error, cred, rgid, egid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(cred_check_setresuid, "struct ucred *", "uid_t",
       "uid_t", "uid_t");
   
   int
   mac_cred_check_setresuid(struct ucred *cred, uid_t ruid, uid_t euid,
       uid_t suid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_setresuid, cred, ruid, euid, suid);
           MAC_CHECK_PROBE4(cred_check_setresuid, error, cred, ruid, euid,
               suid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(cred_check_setresgid, "struct ucred *", "gid_t",
       "gid_t", "gid_t");
   
   int
   mac_cred_check_setresgid(struct ucred *cred, gid_t rgid, gid_t egid,
       gid_t sgid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_setresgid, cred, rgid, egid, sgid);
           MAC_CHECK_PROBE4(cred_check_setresgid, error, cred, rgid, egid,
               sgid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(cred_check_visible, "struct ucred *",
       "struct ucred *");
   
   int
   mac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(cred_check_visible, cr1, cr2);
           MAC_CHECK_PROBE2(cred_check_visible, error, cr1, cr2);
   
           return (error);
   }

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