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

     /*
      * Copyright (c) 2006-2007 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 <sys/param.h>
    #include <sys/types.h>  
    #include <sys/vnode.h>  
    #include <sys/vnode_internal.h>
    #include <sys/kauth.h>
    #include <sys/queue.h>  
    #include <security/mac_internal.h>
    #include <bsd/bsm/audit.h>
    #include <bsd/security/audit/audit.h>
    #include <bsd/sys/malloc.h>
    #include <vm/vm_kern.h>
    #include <kern/kalloc.h>
    #include <kern/zalloc.h>
    
    
    int mac_audit(__unused int len, __unused u_char *data);
    
    
    #if CONFIG_AUDIT
    
    /* The zone allocator is initialized in mac_base.c. */
    zone_t mac_audit_data_zone;
    
    int
    mac_system_check_audit(struct ucred *cred, void *record, int length)
    {
            int error;
    
            MAC_CHECK(system_check_audit, cred, record, length);
    
            return (error);
    }
    
    int
    mac_system_check_auditon(struct ucred *cred, int cmd)
    {
            int error;
   
           MAC_CHECK(system_check_auditon, cred, cmd);
   
           return (error);
   }
   
   int
   mac_system_check_auditctl(struct ucred *cred, struct vnode *vp)
   {
           int error;
           struct label *vl = vp ? vp->v_label : NULL;
   
           MAC_CHECK(system_check_auditctl, cred, vp, vl);
   
           return (error);
   }
   
   int
   mac_proc_check_getauid(struct proc *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_getauid, cred);
           kauth_cred_unref(&cred);
   
           return (error);
   }
   
   int
   mac_proc_check_setauid(struct proc *curp, uid_t auid)
   {
           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_setauid, cred, auid);
           kauth_cred_unref(&cred);
   
           return (error);
   }
   
   int 
   mac_proc_check_getaudit(struct proc *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_getaudit, cred);
           kauth_cred_unref(&cred);
   
           return (error);
   }
   
   int
   mac_proc_check_setaudit(struct proc *curp, struct auditinfo_addr *ai)
   {
           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_setaudit, cred, ai);
           kauth_cred_unref(&cred);
   
           return (error);
   }
   
   #if 0
   /*
    * This is the framework entry point for MAC policies to use to add
    * arbitrary data to the current audit record.
    * (Currently not supported, as no existing audit viewers would 
    * display this format)
    * 
    */
   int
   mac_audit_data(int len, u_char *data, mac_policy_handle_t handle)
   {
           char *sanitized;
   
           if ((len <= 0) || (len > MAC_AUDIT_DATA_LIMIT))
                   return (EINVAL);
   
           sanitized = (char *)zalloc(mac_audit_data_zone);
   
           bcopy(data, sanitized, len);
           return (audit_mac_data(MAC_AUDIT_DATA_TYPE, len, sanitized));
   }
   #endif
   
   /*
    * This is the entry point a MAC policy will call to add NULL-
    * terminated ASCII text to the current audit record.
    */
   int
   mac_audit_text(char *text, mac_policy_handle_t handle)
   {
           char *sanitized;
           const char *name;
           int i, size, plen, len;
   
           name = mac_get_mpc(handle)->mpc_name;
           len = strlen(text);
           plen = 2 + strlen(name);
           if (plen + len >= MAC_AUDIT_DATA_LIMIT)
                   return (EINVAL);
   
           /*
            * Make sure the text is only composed of only ASCII printable
            * characters.
            */
           for (i=0; i < len; i++)
                   if (text[i] < (char) 32 || text[i] > (char) 126)
                           return (EINVAL);
   
           size = len + plen + 1;
           sanitized = (char *)zalloc(mac_audit_data_zone);
   
           strlcpy(sanitized, name, MAC_AUDIT_DATA_LIMIT);
           strncat(sanitized, ": ", MAC_AUDIT_DATA_LIMIT - plen + 2);
           strncat(sanitized, text, MAC_AUDIT_DATA_LIMIT - plen);
   
           return (audit_mac_data(MAC_AUDIT_TEXT_TYPE, size, (u_char *)sanitized));
   }
   
   int
   mac_audit_check_preselect(struct ucred *cred, unsigned short syscode, void *args)
   {
           struct mac_policy_conf *mpc;
           int ret, error;
           u_int i;
   
           ret = MAC_AUDIT_DEFAULT;
           for (i = 0; i < mac_policy_list.staticmax; i++) {
                   mpc = mac_policy_list.entries[i].mpc;
                   if (mpc == NULL)
                           continue;
   
                   if (mpc->mpc_ops->mpo_audit_check_preselect != NULL) {
                           error = mpc->mpc_ops->mpo_audit_check_preselect(cred,
                               syscode, args);
                           ret = (ret > error ? ret : error);
                   }
           }
           if (mac_policy_list_conditional_busy() != 0) {
                   for (; i <= mac_policy_list.maxindex; i++) {
                           mpc = mac_policy_list.entries[i].mpc;
                           if (mpc == NULL)
                                   continue;
   
                           if (mpc->mpc_ops->mpo_audit_check_preselect != NULL) {
                                   error = mpc->mpc_ops->mpo_audit_check_preselect(cred,
                                       syscode, args);
                                   ret = (ret > error ? ret : error);
                           }
                   }
                   mac_policy_list_unbusy();
           }
   
           return (ret);
   }
   
   int
   mac_audit_check_postselect(struct ucred *cred, unsigned short syscode,
       void *args, int error, int retval, int mac_forced)
   {
           struct mac_policy_conf *mpc;
           int ret, mac_error;
           u_int i;
   
           /*
            * If the audit was forced by a MAC policy by mac_audit_check_preselect(),
            * echo that.
            */
           if (mac_forced)
                   return (MAC_AUDIT_YES);
   
           ret = MAC_AUDIT_DEFAULT;
           for (i = 0; i < mac_policy_list.staticmax; i++) {
                   mpc = mac_policy_list.entries[i].mpc;
                   if (mpc == NULL)
                           continue;
   
                   if (mpc->mpc_ops->mpo_audit_check_postselect != NULL) {
                           mac_error = mpc->mpc_ops->mpo_audit_check_postselect(cred,
                               syscode, args, error, retval);
                           ret = (ret > mac_error ? ret : mac_error);
                   }
           }
           if (mac_policy_list_conditional_busy() != 0) {
                   for (; i <= mac_policy_list.maxindex; i++) {
                           mpc = mac_policy_list.entries[i].mpc;
                           if (mpc == NULL)
                                   continue;
   
                           if (mpc->mpc_ops->mpo_audit_check_postselect != NULL) {
                                   mac_error = mpc->mpc_ops->mpo_audit_check_postselect(cred,
                                       syscode, args, error, retval);
                                   ret = (ret > mac_error ? ret : mac_error);
                           }
                   }
                   mac_policy_list_unbusy();
           }
   
           return (ret);
   }
   
   #else   /* !CONFIG_AUDIT */
   
   /*
    * Function stubs for when AUDIT isn't defined.
    */
   
   int
   mac_system_check_audit(__unused struct ucred *cred, __unused void *record, __unused int length)
   {
   
           return (0);
   }
   
   int
   mac_system_check_auditon(__unused struct ucred *cred, __unused int cmd)
   {
   
           return (0);
   }
   
   int
   mac_system_check_auditctl(__unused struct ucred *cred, __unused struct vnode *vp)
   {
   
           return (0);
   }
   
   int
   mac_proc_check_getauid(__unused struct proc *curp)
   {
   
           return (0);
   }
   
   int
   mac_proc_check_setauid(__unused struct proc *curp, __unused uid_t auid)
   {
   
           return (0);
   }
   
   int
   mac_proc_check_getaudit(__unused struct proc *curp)
   {
   
           return (0);
   }
   
   int
   mac_proc_check_setaudit(__unused struct proc *curp,
       __unused struct auditinfo_addr *ai)
   {
   
           return (0);
   }
   
   int
   mac_audit_check_preselect(__unused struct ucred *cred, __unused unsigned short syscode,
       __unused void *args)
   {
   
           return (MAC_AUDIT_DEFAULT);
   }
   
   int
   mac_audit_check_postselect(__unused struct ucred *cred, __unused unsigned short syscode,
       __unused void *args, __unused int error, __unused int retval, __unused int mac_forced)
   {
   
           return (MAC_AUDIT_DEFAULT);
   }
   
   int
   mac_audit(__unused int len, __unused u_char *data)
   {
   
           return (0);
   }
   
   int
   mac_audit_text(__unused char *text, __unused mac_policy_handle_t handle)
   {
           return (0);
   }
   #endif  /* !CONFIG_AUDIT */

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