audit_arg.c

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    1 /*-
    2  * Copyright (c) 1999-2005 Apple Inc.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1.  Redistributions of source code must retain the above copyright
    9  *     notice, this list of conditions and the following disclaimer.
   10  * 2.  Redistributions in binary form must reproduce the above copyright
   11  *     notice, this list of conditions and the following disclaimer in the
   12  *     documentation and/or other materials provided with the distribution.
   13  * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
   14  *     its contributors may be used to endorse or promote products derived
   15  *     from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR
   21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
   26  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   27  * POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/filedesc.h>
   35 #include <sys/ipc.h>
   36 #include <sys/mount.h>
   37 #include <sys/proc.h>
   38 #include <sys/socket.h>
   39 #include <sys/socketvar.h>
   40 #include <sys/protosw.h>
   41 #include <sys/domain.h>
   42 #include <sys/sbuf.h>
   43 #include <sys/systm.h>
   44 #include <sys/un.h>
   45 #include <sys/vnode.h>
   46 
   47 #include <netinet/in.h>
   48 #include <netinet/in_pcb.h>
   49 
   50 #include <security/audit/audit.h>
   51 #include <security/audit/audit_private.h>
   52 
   53 /*
   54  * Calls to manipulate elements of the audit record structure from system
   55  * call code.  Macro wrappers will prevent this functions from being entered
   56  * if auditing is disabled, avoiding the function call cost.  We check the
   57  * thread audit record pointer anyway, as the audit condition could change,
   58  * and pre-selection may not have allocated an audit record for this event.
   59  *
   60  * XXXAUDIT: Should we assert, in each case, that this field of the record
   61  * hasn't already been filled in?
   62  */
   63 void
   64 audit_arg_addr(void *addr)
   65 {
   66         struct kaudit_record *ar;
   67 
   68         ar = currecord();
   69         if (ar == NULL)
   70                 return;
   71 
   72         ar->k_ar.ar_arg_addr = addr;
   73         ARG_SET_VALID(ar, ARG_ADDR);
   74 }
   75 
   76 void
   77 audit_arg_exit(int status, int retval)
   78 {
   79         struct kaudit_record *ar;
   80 
   81         ar = currecord();
   82         if (ar == NULL)
   83                 return;
   84 
   85         ar->k_ar.ar_arg_exitstatus = status;
   86         ar->k_ar.ar_arg_exitretval = retval;
   87         ARG_SET_VALID(ar, ARG_EXIT);
   88 }
   89 
   90 void
   91 audit_arg_len(int len)
   92 {
   93         struct kaudit_record *ar;
   94 
   95         ar = currecord();
   96         if (ar == NULL)
   97                 return;
   98 
   99         ar->k_ar.ar_arg_len = len;
  100         ARG_SET_VALID(ar, ARG_LEN);
  101 }
  102 
  103 void
  104 audit_arg_atfd1(int atfd)
  105 {
  106         struct kaudit_record *ar;
  107 
  108         ar = currecord();
  109         if (ar == NULL)
  110                 return;
  111 
  112         ar->k_ar.ar_arg_atfd1 = atfd;
  113         ARG_SET_VALID(ar, ARG_ATFD1);
  114 }
  115 
  116 void
  117 audit_arg_atfd2(int atfd)
  118 {
  119         struct kaudit_record *ar;
  120 
  121         ar = currecord();
  122         if (ar == NULL)
  123                 return;
  124 
  125         ar->k_ar.ar_arg_atfd2 = atfd;
  126         ARG_SET_VALID(ar, ARG_ATFD2);
  127 }
  128 
  129 void
  130 audit_arg_fd(int fd)
  131 {
  132         struct kaudit_record *ar;
  133 
  134         ar = currecord();
  135         if (ar == NULL)
  136                 return;
  137 
  138         ar->k_ar.ar_arg_fd = fd;
  139         ARG_SET_VALID(ar, ARG_FD);
  140 }
  141 
  142 void
  143 audit_arg_fflags(int fflags)
  144 {
  145         struct kaudit_record *ar;
  146 
  147         ar = currecord();
  148         if (ar == NULL)
  149                 return;
  150 
  151         ar->k_ar.ar_arg_fflags = fflags;
  152         ARG_SET_VALID(ar, ARG_FFLAGS);
  153 }
  154 
  155 void
  156 audit_arg_gid(gid_t gid)
  157 {
  158         struct kaudit_record *ar;
  159 
  160         ar = currecord();
  161         if (ar == NULL)
  162                 return;
  163 
  164         ar->k_ar.ar_arg_gid = gid;
  165         ARG_SET_VALID(ar, ARG_GID);
  166 }
  167 
  168 void
  169 audit_arg_uid(uid_t uid)
  170 {
  171         struct kaudit_record *ar;
  172 
  173         ar = currecord();
  174         if (ar == NULL)
  175                 return;
  176 
  177         ar->k_ar.ar_arg_uid = uid;
  178         ARG_SET_VALID(ar, ARG_UID);
  179 }
  180 
  181 void
  182 audit_arg_egid(gid_t egid)
  183 {
  184         struct kaudit_record *ar;
  185 
  186         ar = currecord();
  187         if (ar == NULL)
  188                 return;
  189 
  190         ar->k_ar.ar_arg_egid = egid;
  191         ARG_SET_VALID(ar, ARG_EGID);
  192 }
  193 
  194 void
  195 audit_arg_euid(uid_t euid)
  196 {
  197         struct kaudit_record *ar;
  198 
  199         ar = currecord();
  200         if (ar == NULL)
  201                 return;
  202 
  203         ar->k_ar.ar_arg_euid = euid;
  204         ARG_SET_VALID(ar, ARG_EUID);
  205 }
  206 
  207 void
  208 audit_arg_rgid(gid_t rgid)
  209 {
  210         struct kaudit_record *ar;
  211 
  212         ar = currecord();
  213         if (ar == NULL)
  214                 return;
  215 
  216         ar->k_ar.ar_arg_rgid = rgid;
  217         ARG_SET_VALID(ar, ARG_RGID);
  218 }
  219 
  220 void
  221 audit_arg_ruid(uid_t ruid)
  222 {
  223         struct kaudit_record *ar;
  224 
  225         ar = currecord();
  226         if (ar == NULL)
  227                 return;
  228 
  229         ar->k_ar.ar_arg_ruid = ruid;
  230         ARG_SET_VALID(ar, ARG_RUID);
  231 }
  232 
  233 void
  234 audit_arg_sgid(gid_t sgid)
  235 {
  236         struct kaudit_record *ar;
  237 
  238         ar = currecord();
  239         if (ar == NULL)
  240                 return;
  241 
  242         ar->k_ar.ar_arg_sgid = sgid;
  243         ARG_SET_VALID(ar, ARG_SGID);
  244 }
  245 
  246 void
  247 audit_arg_suid(uid_t suid)
  248 {
  249         struct kaudit_record *ar;
  250 
  251         ar = currecord();
  252         if (ar == NULL)
  253                 return;
  254 
  255         ar->k_ar.ar_arg_suid = suid;
  256         ARG_SET_VALID(ar, ARG_SUID);
  257 }
  258 
  259 void
  260 audit_arg_groupset(gid_t *gidset, u_int gidset_size)
  261 {
  262         u_int i;
  263         struct kaudit_record *ar;
  264 
  265         KASSERT(gidset_size <= ngroups_max + 1,
  266             ("audit_arg_groupset: gidset_size > (kern.ngroups + 1)"));
  267 
  268         ar = currecord();
  269         if (ar == NULL)
  270                 return;
  271 
  272         if (ar->k_ar.ar_arg_groups.gidset == NULL)
  273                 ar->k_ar.ar_arg_groups.gidset = malloc(
  274                     sizeof(gid_t) * gidset_size, M_AUDITGIDSET, M_WAITOK);
  275 
  276         for (i = 0; i < gidset_size; i++)
  277                 ar->k_ar.ar_arg_groups.gidset[i] = gidset[i];
  278         ar->k_ar.ar_arg_groups.gidset_size = gidset_size;
  279         ARG_SET_VALID(ar, ARG_GROUPSET);
  280 }
  281 
  282 void
  283 audit_arg_login(char *login)
  284 {
  285         struct kaudit_record *ar;
  286 
  287         ar = currecord();
  288         if (ar == NULL)
  289                 return;
  290 
  291         strlcpy(ar->k_ar.ar_arg_login, login, MAXLOGNAME);
  292         ARG_SET_VALID(ar, ARG_LOGIN);
  293 }
  294 
  295 void
  296 audit_arg_ctlname(int *name, int namelen)
  297 {
  298         struct kaudit_record *ar;
  299 
  300         ar = currecord();
  301         if (ar == NULL)
  302                 return;
  303 
  304         bcopy(name, &ar->k_ar.ar_arg_ctlname, namelen * sizeof(int));
  305         ar->k_ar.ar_arg_len = namelen;
  306         ARG_SET_VALID(ar, ARG_CTLNAME | ARG_LEN);
  307 }
  308 
  309 void
  310 audit_arg_mask(int mask)
  311 {
  312         struct kaudit_record *ar;
  313 
  314         ar = currecord();
  315         if (ar == NULL)
  316                 return;
  317 
  318         ar->k_ar.ar_arg_mask = mask;
  319         ARG_SET_VALID(ar, ARG_MASK);
  320 }
  321 
  322 void
  323 audit_arg_mode(mode_t mode)
  324 {
  325         struct kaudit_record *ar;
  326 
  327         ar = currecord();
  328         if (ar == NULL)
  329                 return;
  330 
  331         ar->k_ar.ar_arg_mode = mode;
  332         ARG_SET_VALID(ar, ARG_MODE);
  333 }
  334 
  335 void
  336 audit_arg_dev(int dev)
  337 {
  338         struct kaudit_record *ar;
  339 
  340         ar = currecord();
  341         if (ar == NULL)
  342                 return;
  343 
  344         ar->k_ar.ar_arg_dev = dev;
  345         ARG_SET_VALID(ar, ARG_DEV);
  346 }
  347 
  348 void
  349 audit_arg_value(long value)
  350 {
  351         struct kaudit_record *ar;
  352 
  353         ar = currecord();
  354         if (ar == NULL)
  355                 return;
  356 
  357         ar->k_ar.ar_arg_value = value;
  358         ARG_SET_VALID(ar, ARG_VALUE);
  359 }
  360 
  361 void
  362 audit_arg_owner(uid_t uid, gid_t gid)
  363 {
  364         struct kaudit_record *ar;
  365 
  366         ar = currecord();
  367         if (ar == NULL)
  368                 return;
  369 
  370         ar->k_ar.ar_arg_uid = uid;
  371         ar->k_ar.ar_arg_gid = gid;
  372         ARG_SET_VALID(ar, ARG_UID | ARG_GID);
  373 }
  374 
  375 void
  376 audit_arg_pid(pid_t pid)
  377 {
  378         struct kaudit_record *ar;
  379 
  380         ar = currecord();
  381         if (ar == NULL)
  382                 return;
  383 
  384         ar->k_ar.ar_arg_pid = pid;
  385         ARG_SET_VALID(ar, ARG_PID);
  386 }
  387 
  388 void
  389 audit_arg_process(struct proc *p)
  390 {
  391         struct kaudit_record *ar;
  392         struct ucred *cred;
  393 
  394         KASSERT(p != NULL, ("audit_arg_process: p == NULL"));
  395 
  396         PROC_LOCK_ASSERT(p, MA_OWNED);
  397 
  398         ar = currecord();
  399         if (ar == NULL)
  400                 return;
  401 
  402         cred = p->p_ucred;
  403         ar->k_ar.ar_arg_auid = cred->cr_audit.ai_auid;
  404         ar->k_ar.ar_arg_euid = cred->cr_uid;
  405         ar->k_ar.ar_arg_egid = cred->cr_groups[0];
  406         ar->k_ar.ar_arg_ruid = cred->cr_ruid;
  407         ar->k_ar.ar_arg_rgid = cred->cr_rgid;
  408         ar->k_ar.ar_arg_asid = cred->cr_audit.ai_asid;
  409         ar->k_ar.ar_arg_termid_addr = cred->cr_audit.ai_termid;
  410         ar->k_ar.ar_arg_pid = p->p_pid;
  411         ARG_SET_VALID(ar, ARG_AUID | ARG_EUID | ARG_EGID | ARG_RUID |
  412             ARG_RGID | ARG_ASID | ARG_TERMID_ADDR | ARG_PID | ARG_PROCESS);
  413 }
  414 
  415 void
  416 audit_arg_signum(u_int signum)
  417 {
  418         struct kaudit_record *ar;
  419 
  420         ar = currecord();
  421         if (ar == NULL)
  422                 return;
  423 
  424         ar->k_ar.ar_arg_signum = signum;
  425         ARG_SET_VALID(ar, ARG_SIGNUM);
  426 }
  427 
  428 void
  429 audit_arg_socket(int sodomain, int sotype, int soprotocol)
  430 {
  431         struct kaudit_record *ar;
  432 
  433         ar = currecord();
  434         if (ar == NULL)
  435                 return;
  436 
  437         ar->k_ar.ar_arg_sockinfo.so_domain = sodomain;
  438         ar->k_ar.ar_arg_sockinfo.so_type = sotype;
  439         ar->k_ar.ar_arg_sockinfo.so_protocol = soprotocol;
  440         ARG_SET_VALID(ar, ARG_SOCKINFO);
  441 }
  442 
  443 void
  444 audit_arg_sockaddr(struct thread *td, struct sockaddr *sa)
  445 {
  446         struct kaudit_record *ar;
  447 
  448         KASSERT(td != NULL, ("audit_arg_sockaddr: td == NULL"));
  449         KASSERT(sa != NULL, ("audit_arg_sockaddr: sa == NULL"));
  450 
  451         ar = currecord();
  452         if (ar == NULL)
  453                 return;
  454 
  455         bcopy(sa, &ar->k_ar.ar_arg_sockaddr, sa->sa_len);
  456         switch (sa->sa_family) {
  457         case AF_INET:
  458                 ARG_SET_VALID(ar, ARG_SADDRINET);
  459                 break;
  460 
  461         case AF_INET6:
  462                 ARG_SET_VALID(ar, ARG_SADDRINET6);
  463                 break;
  464 
  465         case AF_UNIX:
  466                 audit_arg_upath1(td, AT_FDCWD,
  467                     ((struct sockaddr_un *)sa)->sun_path);
  468                 ARG_SET_VALID(ar, ARG_SADDRUNIX);
  469                 break;
  470         /* XXXAUDIT: default:? */
  471         }
  472 }
  473 
  474 void
  475 audit_arg_auid(uid_t auid)
  476 {
  477         struct kaudit_record *ar;
  478 
  479         ar = currecord();
  480         if (ar == NULL)
  481                 return;
  482 
  483         ar->k_ar.ar_arg_auid = auid;
  484         ARG_SET_VALID(ar, ARG_AUID);
  485 }
  486 
  487 void
  488 audit_arg_auditinfo(struct auditinfo *au_info)
  489 {
  490         struct kaudit_record *ar;
  491 
  492         ar = currecord();
  493         if (ar == NULL)
  494                 return;
  495 
  496         ar->k_ar.ar_arg_auid = au_info->ai_auid;
  497         ar->k_ar.ar_arg_asid = au_info->ai_asid;
  498         ar->k_ar.ar_arg_amask.am_success = au_info->ai_mask.am_success;
  499         ar->k_ar.ar_arg_amask.am_failure = au_info->ai_mask.am_failure;
  500         ar->k_ar.ar_arg_termid.port = au_info->ai_termid.port;
  501         ar->k_ar.ar_arg_termid.machine = au_info->ai_termid.machine;
  502         ARG_SET_VALID(ar, ARG_AUID | ARG_ASID | ARG_AMASK | ARG_TERMID);
  503 }
  504 
  505 void
  506 audit_arg_auditinfo_addr(struct auditinfo_addr *au_info)
  507 {
  508         struct kaudit_record *ar;
  509 
  510         ar = currecord();
  511         if (ar == NULL)
  512                 return;
  513 
  514         ar->k_ar.ar_arg_auid = au_info->ai_auid;
  515         ar->k_ar.ar_arg_asid = au_info->ai_asid;
  516         ar->k_ar.ar_arg_amask.am_success = au_info->ai_mask.am_success;
  517         ar->k_ar.ar_arg_amask.am_failure = au_info->ai_mask.am_failure;
  518         ar->k_ar.ar_arg_termid_addr.at_type = au_info->ai_termid.at_type;
  519         ar->k_ar.ar_arg_termid_addr.at_port = au_info->ai_termid.at_port;
  520         ar->k_ar.ar_arg_termid_addr.at_addr[0] = au_info->ai_termid.at_addr[0];
  521         ar->k_ar.ar_arg_termid_addr.at_addr[1] = au_info->ai_termid.at_addr[1];
  522         ar->k_ar.ar_arg_termid_addr.at_addr[2] = au_info->ai_termid.at_addr[2];
  523         ar->k_ar.ar_arg_termid_addr.at_addr[3] = au_info->ai_termid.at_addr[3];
  524         ARG_SET_VALID(ar, ARG_AUID | ARG_ASID | ARG_AMASK | ARG_TERMID_ADDR);
  525 }
  526 
  527 void
  528 audit_arg_text(char *text)
  529 {
  530         struct kaudit_record *ar;
  531 
  532         KASSERT(text != NULL, ("audit_arg_text: text == NULL"));
  533 
  534         ar = currecord();
  535         if (ar == NULL)
  536                 return;
  537 
  538         /* Invalidate the text string */
  539         ar->k_ar.ar_valid_arg &= (ARG_ALL ^ ARG_TEXT);
  540 
  541         if (ar->k_ar.ar_arg_text == NULL)
  542                 ar->k_ar.ar_arg_text = malloc(MAXPATHLEN, M_AUDITTEXT,
  543                     M_WAITOK);
  544 
  545         strncpy(ar->k_ar.ar_arg_text, text, MAXPATHLEN);
  546         ARG_SET_VALID(ar, ARG_TEXT);
  547 }
  548 
  549 void
  550 audit_arg_cmd(int cmd)
  551 {
  552         struct kaudit_record *ar;
  553 
  554         ar = currecord();
  555         if (ar == NULL)
  556                 return;
  557 
  558         ar->k_ar.ar_arg_cmd = cmd;
  559         ARG_SET_VALID(ar, ARG_CMD);
  560 }
  561 
  562 void
  563 audit_arg_svipc_cmd(int cmd)
  564 {
  565         struct kaudit_record *ar;
  566 
  567         ar = currecord();
  568         if (ar == NULL)
  569                 return;
  570 
  571         ar->k_ar.ar_arg_svipc_cmd = cmd;
  572         ARG_SET_VALID(ar, ARG_SVIPC_CMD);
  573 }
  574 
  575 void
  576 audit_arg_svipc_perm(struct ipc_perm *perm)
  577 {
  578         struct kaudit_record *ar;
  579 
  580         ar = currecord();
  581         if (ar == NULL)
  582                 return;
  583 
  584         bcopy(perm, &ar->k_ar.ar_arg_svipc_perm,
  585             sizeof(ar->k_ar.ar_arg_svipc_perm));
  586         ARG_SET_VALID(ar, ARG_SVIPC_PERM);
  587 }
  588 
  589 void
  590 audit_arg_svipc_id(int id)
  591 {
  592         struct kaudit_record *ar;
  593 
  594         ar = currecord();
  595         if (ar == NULL)
  596                 return;
  597 
  598         ar->k_ar.ar_arg_svipc_id = id;
  599         ARG_SET_VALID(ar, ARG_SVIPC_ID);
  600 }
  601 
  602 void
  603 audit_arg_svipc_addr(void * addr)
  604 {
  605         struct kaudit_record *ar;
  606 
  607         ar = currecord();
  608         if (ar == NULL)
  609                 return;
  610 
  611         ar->k_ar.ar_arg_svipc_addr = addr;
  612         ARG_SET_VALID(ar, ARG_SVIPC_ADDR);
  613 }
  614 
  615 void
  616 audit_arg_posix_ipc_perm(uid_t uid, gid_t gid, mode_t mode)
  617 {
  618         struct kaudit_record *ar;
  619 
  620         ar = currecord();
  621         if (ar == NULL)
  622                 return;
  623 
  624         ar->k_ar.ar_arg_pipc_perm.pipc_uid = uid;
  625         ar->k_ar.ar_arg_pipc_perm.pipc_gid = gid;
  626         ar->k_ar.ar_arg_pipc_perm.pipc_mode = mode;
  627         ARG_SET_VALID(ar, ARG_POSIX_IPC_PERM);
  628 }
  629 
  630 void
  631 audit_arg_auditon(union auditon_udata *udata)
  632 {
  633         struct kaudit_record *ar;
  634 
  635         ar = currecord();
  636         if (ar == NULL)
  637                 return;
  638 
  639         bcopy((void *)udata, &ar->k_ar.ar_arg_auditon,
  640             sizeof(ar->k_ar.ar_arg_auditon));
  641         ARG_SET_VALID(ar, ARG_AUDITON);
  642 }
  643 
  644 /*
  645  * Audit information about a file, either the file's vnode info, or its
  646  * socket address info.
  647  */
  648 void
  649 audit_arg_file(struct proc *p, struct file *fp)
  650 {
  651         struct kaudit_record *ar;
  652         struct socket *so;
  653         struct inpcb *pcb;
  654         struct vnode *vp;
  655         int vfslocked;
  656 
  657         ar = currecord();
  658         if (ar == NULL)
  659                 return;
  660 
  661         switch (fp->f_type) {
  662         case DTYPE_VNODE:
  663         case DTYPE_FIFO:
  664                 /*
  665                  * XXXAUDIT: Only possibly to record as first vnode?
  666                  */
  667                 vp = fp->f_vnode;
  668                 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
  669                 vn_lock(vp, LK_SHARED | LK_RETRY);
  670                 audit_arg_vnode1(vp);
  671                 VOP_UNLOCK(vp, 0);
  672                 VFS_UNLOCK_GIANT(vfslocked);
  673                 break;
  674 
  675         case DTYPE_SOCKET:
  676                 so = (struct socket *)fp->f_data;
  677                 if (INP_CHECK_SOCKAF(so, PF_INET)) {
  678                         SOCK_LOCK(so);
  679                         ar->k_ar.ar_arg_sockinfo.so_type =
  680                             so->so_type;
  681                         ar->k_ar.ar_arg_sockinfo.so_domain =
  682                             INP_SOCKAF(so);
  683                         ar->k_ar.ar_arg_sockinfo.so_protocol =
  684                             so->so_proto->pr_protocol;
  685                         SOCK_UNLOCK(so);
  686                         pcb = (struct inpcb *)so->so_pcb;
  687                         INP_RLOCK(pcb);
  688                         ar->k_ar.ar_arg_sockinfo.so_raddr =
  689                             pcb->inp_faddr.s_addr;
  690                         ar->k_ar.ar_arg_sockinfo.so_laddr =
  691                             pcb->inp_laddr.s_addr;
  692                         ar->k_ar.ar_arg_sockinfo.so_rport =
  693                             pcb->inp_fport;
  694                         ar->k_ar.ar_arg_sockinfo.so_lport =
  695                             pcb->inp_lport;
  696                         INP_RUNLOCK(pcb);
  697                         ARG_SET_VALID(ar, ARG_SOCKINFO);
  698                 }
  699                 break;
  700 
  701         default:
  702                 /* XXXAUDIT: else? */
  703                 break;
  704         }
  705 }
  706 
  707 /*
  708  * Store a path as given by the user process for auditing into the audit
  709  * record stored on the user thread.  This function will allocate the memory
  710  * to store the path info if not already available.  This memory will be
  711  * freed when the audit record is freed.
  712  */
  713 static void
  714 audit_arg_upath(struct thread *td, int dirfd, char *upath, char **pathp)
  715 {
  716 
  717         if (*pathp == NULL)
  718                 *pathp = malloc(MAXPATHLEN, M_AUDITPATH, M_WAITOK);
  719         audit_canon_path(td, dirfd, upath, *pathp);
  720 }
  721 
  722 void
  723 audit_arg_upath1(struct thread *td, int dirfd, char *upath)
  724 {
  725         struct kaudit_record *ar;
  726 
  727         ar = currecord();
  728         if (ar == NULL)
  729                 return;
  730 
  731         audit_arg_upath(td, dirfd, upath, &ar->k_ar.ar_arg_upath1);
  732         ARG_SET_VALID(ar, ARG_UPATH1);
  733 }
  734 
  735 void
  736 audit_arg_upath2(struct thread *td, int dirfd, char *upath)
  737 {
  738         struct kaudit_record *ar;
  739 
  740         ar = currecord();
  741         if (ar == NULL)
  742                 return;
  743 
  744         audit_arg_upath(td, dirfd, upath, &ar->k_ar.ar_arg_upath2);
  745         ARG_SET_VALID(ar, ARG_UPATH2);
  746 }
  747 
  748 /*
  749  * Function to save the path and vnode attr information into the audit
  750  * record.
  751  *
  752  * It is assumed that the caller will hold any vnode locks necessary to
  753  * perform a VOP_GETATTR() on the passed vnode.
  754  *
  755  * XXX: The attr code is very similar to vfs_vnops.c:vn_stat(), but always
  756  * provides access to the generation number as we need that to construct the
  757  * BSM file ID.
  758  *
  759  * XXX: We should accept the process argument from the caller, since it's
  760  * very likely they already have a reference.
  761  *
  762  * XXX: Error handling in this function is poor.
  763  *
  764  * XXXAUDIT: Possibly KASSERT the path pointer is NULL?
  765  */
  766 static int
  767 audit_arg_vnode(struct vnode *vp, struct vnode_au_info *vnp)
  768 {
  769         struct vattr vattr;
  770         int error;
  771 
  772         /*
  773          * Assume that if the caller is calling audit_arg_vnode() on a
  774          * non-MPSAFE vnode, then it will have acquired Giant.
  775          */
  776         VFS_ASSERT_GIANT(vp->v_mount);
  777         ASSERT_VOP_LOCKED(vp, "audit_arg_vnode");
  778 
  779         error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
  780         if (error) {
  781                 /* XXX: How to handle this case? */
  782                 return (error);
  783         }
  784 
  785         vnp->vn_mode = vattr.va_mode;
  786         vnp->vn_uid = vattr.va_uid;
  787         vnp->vn_gid = vattr.va_gid;
  788         vnp->vn_dev = vattr.va_rdev;
  789         vnp->vn_fsid = vattr.va_fsid;
  790         vnp->vn_fileid = vattr.va_fileid;
  791         vnp->vn_gen = vattr.va_gen;
  792         return (0);
  793 }
  794 
  795 void
  796 audit_arg_vnode1(struct vnode *vp)
  797 {
  798         struct kaudit_record *ar;
  799         int error;
  800 
  801         ar = currecord();
  802         if (ar == NULL)
  803                 return;
  804 
  805         ARG_CLEAR_VALID(ar, ARG_VNODE1);
  806         error = audit_arg_vnode(vp, &ar->k_ar.ar_arg_vnode1);
  807         if (error == 0)
  808                 ARG_SET_VALID(ar, ARG_VNODE1);
  809 }
  810 
  811 void
  812 audit_arg_vnode2(struct vnode *vp)
  813 {
  814         struct kaudit_record *ar;
  815         int error;
  816 
  817         ar = currecord();
  818         if (ar == NULL)
  819                 return;
  820 
  821         ARG_CLEAR_VALID(ar, ARG_VNODE2);
  822         error = audit_arg_vnode(vp, &ar->k_ar.ar_arg_vnode2);
  823         if (error == 0)
  824                 ARG_SET_VALID(ar, ARG_VNODE2);
  825 }
  826 
  827 /*
  828  * Audit the argument strings passed to exec.
  829  */
  830 void
  831 audit_arg_argv(char *argv, int argc, int length)
  832 {
  833         struct kaudit_record *ar;
  834 
  835         if (audit_argv == 0)
  836                 return;
  837 
  838         ar = currecord();
  839         if (ar == NULL)
  840                 return;
  841 
  842         ar->k_ar.ar_arg_argv = malloc(length, M_AUDITTEXT, M_WAITOK);
  843         bcopy(argv, ar->k_ar.ar_arg_argv, length);
  844         ar->k_ar.ar_arg_argc = argc;
  845         ARG_SET_VALID(ar, ARG_ARGV);
  846 }
  847 
  848 /*
  849  * Audit the environment strings passed to exec.
  850  */
  851 void
  852 audit_arg_envv(char *envv, int envc, int length)
  853 {
  854         struct kaudit_record *ar;
  855 
  856         if (audit_arge == 0)
  857                 return;
  858 
  859         ar = currecord();
  860         if (ar == NULL)
  861                 return;
  862 
  863         ar->k_ar.ar_arg_envv = malloc(length, M_AUDITTEXT, M_WAITOK);
  864         bcopy(envv, ar->k_ar.ar_arg_envv, length);
  865         ar->k_ar.ar_arg_envc = envc;
  866         ARG_SET_VALID(ar, ARG_ENVV);
  867 }
  868 
  869 void
  870 audit_arg_rights(cap_rights_t rights)
  871 {
  872         struct kaudit_record *ar;
  873 
  874         ar = currecord();
  875         if (ar == NULL)
  876                 return;
  877 
  878         ar->k_ar.ar_arg_rights = rights;
  879         ARG_SET_VALID(ar, ARG_RIGHTS);
  880 }
  881 
  882 /*
  883  * The close() system call uses it's own audit call to capture the path/vnode
  884  * information because those pieces are not easily obtained within the system
  885  * call itself.
  886  */
  887 void
  888 audit_sysclose(struct thread *td, int fd)
  889 {
  890         struct kaudit_record *ar;
  891         struct vnode *vp;
  892         struct file *fp;
  893         int vfslocked;
  894 
  895         KASSERT(td != NULL, ("audit_sysclose: td == NULL"));
  896 
  897         ar = currecord();
  898         if (ar == NULL)
  899                 return;
  900 
  901         audit_arg_fd(fd);
  902 
  903         if (getvnode(td->td_proc->p_fd, fd, 0, &fp) != 0)
  904                 return;
  905 
  906         vp = fp->f_vnode;
  907         vfslocked = VFS_LOCK_GIANT(vp->v_mount);
  908         vn_lock(vp, LK_SHARED | LK_RETRY);
  909         audit_arg_vnode1(vp);
  910         VOP_UNLOCK(vp, 0);
  911         VFS_UNLOCK_GIANT(vfslocked);
  912         fdrop(fp, td);
  913 }
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FreeBSD/Linux Kernel Cross Reference sys/security/audit/audit_arg.c

FreeBSD/Linux Kernel Cross Reference
sys/security/audit/audit_arg.c
