The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_capability.c

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    1 /*-
    2  * Copyright (c) 2008-2011 Robert N. M. Watson
    3  * Copyright (c) 2010-2011 Jonathan Anderson
    4  * Copyright (c) 2012 FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * This software was developed at the University of Cambridge Computer
    8  * Laboratory with support from a grant from Google, Inc.
    9  *
   10  * Portions of this software were developed by Pawel Jakub Dawidek under
   11  * sponsorship from the FreeBSD Foundation.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 /*
   36  * FreeBSD kernel capability facility.
   37  *
   38  * Two kernel features are implemented here: capability mode, a sandboxed mode
   39  * of execution for processes, and capabilities, a refinement on file
   40  * descriptors that allows fine-grained control over operations on the file
   41  * descriptor.  Collectively, these allow processes to run in the style of a
   42  * historic "capability system" in which they can use only resources
   43  * explicitly delegated to them.  This model is enforced by restricting access
   44  * to global namespaces in capability mode.
   45  *
   46  * Capabilities wrap other file descriptor types, binding them to a constant
   47  * rights mask set when the capability is created.  New capabilities may be
   48  * derived from existing capabilities, but only if they have the same or a
   49  * strict subset of the rights on the original capability.
   50  *
   51  * System calls permitted in capability mode are defined in capabilities.conf;
   52  * calls must be carefully audited for safety to ensure that they don't allow
   53  * escape from a sandbox.  Some calls permit only a subset of operations in
   54  * capability mode -- for example, shm_open(2) is limited to creating
   55  * anonymous, rather than named, POSIX shared memory objects.
   56  */
   57 
   58 #include <sys/cdefs.h>
   59 __FBSDID("$FreeBSD: stable/10/sys/kern/sys_capability.c 302229 2016-06-27 21:25:01Z bdrewery $");
   60 
   61 #include "opt_capsicum.h"
   62 #include "opt_ktrace.h"
   63 
   64 #include <sys/param.h>
   65 #include <sys/capsicum.h>
   66 #include <sys/file.h>
   67 #include <sys/filedesc.h>
   68 #include <sys/kernel.h>
   69 #include <sys/limits.h>
   70 #include <sys/lock.h>
   71 #include <sys/mutex.h>
   72 #include <sys/proc.h>
   73 #include <sys/syscallsubr.h>
   74 #include <sys/sysproto.h>
   75 #include <sys/sysctl.h>
   76 #include <sys/systm.h>
   77 #include <sys/ucred.h>
   78 #include <sys/uio.h>
   79 #include <sys/ktrace.h>
   80 
   81 #include <security/audit/audit.h>
   82 
   83 #include <vm/uma.h>
   84 #include <vm/vm.h>
   85 
   86 #ifdef CAPABILITY_MODE
   87 
   88 FEATURE(security_capability_mode, "Capsicum Capability Mode");
   89 
   90 /*
   91  * System call to enter capability mode for the process.
   92  */
   93 int
   94 sys_cap_enter(struct thread *td, struct cap_enter_args *uap)
   95 {
   96         struct ucred *newcred, *oldcred;
   97         struct proc *p;
   98 
   99         if (IN_CAPABILITY_MODE(td))
  100                 return (0);
  101 
  102         newcred = crget();
  103         p = td->td_proc;
  104         PROC_LOCK(p);
  105         oldcred = p->p_ucred;
  106         crcopy(newcred, oldcred);
  107         newcred->cr_flags |= CRED_FLAG_CAPMODE;
  108         proc_set_cred(p, newcred);
  109         PROC_UNLOCK(p);
  110         crfree(oldcred);
  111         return (0);
  112 }
  113 
  114 /*
  115  * System call to query whether the process is in capability mode.
  116  */
  117 int
  118 sys_cap_getmode(struct thread *td, struct cap_getmode_args *uap)
  119 {
  120         u_int i;
  121 
  122         i = IN_CAPABILITY_MODE(td) ? 1 : 0;
  123         return (copyout(&i, uap->modep, sizeof(i)));
  124 }
  125 
  126 #else /* !CAPABILITY_MODE */
  127 
  128 int
  129 sys_cap_enter(struct thread *td, struct cap_enter_args *uap)
  130 {
  131 
  132         return (ENOSYS);
  133 }
  134 
  135 int
  136 sys_cap_getmode(struct thread *td, struct cap_getmode_args *uap)
  137 {
  138 
  139         return (ENOSYS);
  140 }
  141 
  142 #endif /* CAPABILITY_MODE */
  143 
  144 #ifdef CAPABILITIES
  145 
  146 FEATURE(security_capabilities, "Capsicum Capabilities");
  147 
  148 MALLOC_DECLARE(M_FILECAPS);
  149 
  150 static inline int
  151 _cap_check(const cap_rights_t *havep, const cap_rights_t *needp,
  152     enum ktr_cap_fail_type type)
  153 {
  154         int i;
  155 
  156         for (i = 0; i < nitems(havep->cr_rights); i++) {
  157                 if (!cap_rights_contains(havep, needp)) {
  158 #ifdef KTRACE
  159                         if (KTRPOINT(curthread, KTR_CAPFAIL))
  160                                 ktrcapfail(type, needp, havep);
  161 #endif
  162                         return (ENOTCAPABLE);
  163                 }
  164         }
  165         return (0);
  166 }
  167 
  168 /*
  169  * Test whether a capability grants the requested rights.
  170  */
  171 int
  172 cap_check(const cap_rights_t *havep, const cap_rights_t *needp)
  173 {
  174 
  175         return (_cap_check(havep, needp, CAPFAIL_NOTCAPABLE));
  176 }
  177 
  178 /*
  179  * Convert capability rights into VM access flags.
  180  */
  181 u_char
  182 cap_rights_to_vmprot(cap_rights_t *havep)
  183 {
  184         u_char maxprot;
  185 
  186         maxprot = VM_PROT_NONE;
  187         if (cap_rights_is_set(havep, CAP_MMAP_R))
  188                 maxprot |= VM_PROT_READ;
  189         if (cap_rights_is_set(havep, CAP_MMAP_W))
  190                 maxprot |= VM_PROT_WRITE;
  191         if (cap_rights_is_set(havep, CAP_MMAP_X))
  192                 maxprot |= VM_PROT_EXECUTE;
  193 
  194         return (maxprot);
  195 }
  196 
  197 /*
  198  * Extract rights from a capability for monitoring purposes -- not for use in
  199  * any other way, as we want to keep all capability permission evaluation in
  200  * this one file.
  201  */
  202 
  203 cap_rights_t *
  204 cap_rights_fde(struct filedescent *fde)
  205 {
  206 
  207         return (&fde->fde_rights);
  208 }
  209 
  210 cap_rights_t *
  211 cap_rights(struct filedesc *fdp, int fd)
  212 {
  213 
  214         return (cap_rights_fde(&fdp->fd_ofiles[fd]));
  215 }
  216 
  217 /*
  218  * System call to limit rights of the given capability.
  219  */
  220 int
  221 sys_cap_rights_limit(struct thread *td, struct cap_rights_limit_args *uap)
  222 {
  223         struct filedesc *fdp;
  224         cap_rights_t rights;
  225         int error, fd, version;
  226 
  227         cap_rights_init(&rights);
  228 
  229         error = copyin(uap->rightsp, &rights, sizeof(rights.cr_rights[0]));
  230         if (error != 0)
  231                 return (error);
  232         version = CAPVER(&rights);
  233         if (version != CAP_RIGHTS_VERSION_00)
  234                 return (EINVAL);
  235 
  236         error = copyin(uap->rightsp, &rights,
  237             sizeof(rights.cr_rights[0]) * CAPARSIZE(&rights));
  238         if (error != 0)
  239                 return (error);
  240         /* Check for race. */
  241         if (CAPVER(&rights) != version)
  242                 return (EINVAL);
  243 
  244         if (!cap_rights_is_valid(&rights))
  245                 return (EINVAL);
  246 
  247         if (version != CAP_RIGHTS_VERSION) {
  248                 rights.cr_rights[0] &= ~(0x3ULL << 62);
  249                 rights.cr_rights[0] |= ((uint64_t)CAP_RIGHTS_VERSION << 62);
  250         }
  251 #ifdef KTRACE
  252         if (KTRPOINT(td, KTR_STRUCT))
  253                 ktrcaprights(&rights);
  254 #endif
  255 
  256         fd = uap->fd;
  257 
  258         AUDIT_ARG_FD(fd);
  259         AUDIT_ARG_RIGHTS(&rights);
  260 
  261         fdp = td->td_proc->p_fd;
  262         FILEDESC_XLOCK(fdp);
  263         if (fget_locked(fdp, fd) == NULL) {
  264                 FILEDESC_XUNLOCK(fdp);
  265                 return (EBADF);
  266         }
  267         error = _cap_check(cap_rights(fdp, fd), &rights, CAPFAIL_INCREASE);
  268         if (error == 0) {
  269                 fdp->fd_ofiles[fd].fde_rights = rights;
  270                 if (!cap_rights_is_set(&rights, CAP_IOCTL)) {
  271                         free(fdp->fd_ofiles[fd].fde_ioctls, M_FILECAPS);
  272                         fdp->fd_ofiles[fd].fde_ioctls = NULL;
  273                         fdp->fd_ofiles[fd].fde_nioctls = 0;
  274                 }
  275                 if (!cap_rights_is_set(&rights, CAP_FCNTL))
  276                         fdp->fd_ofiles[fd].fde_fcntls = 0;
  277         }
  278         FILEDESC_XUNLOCK(fdp);
  279         return (error);
  280 }
  281 
  282 /*
  283  * System call to query the rights mask associated with a capability.
  284  */
  285 int
  286 sys___cap_rights_get(struct thread *td, struct __cap_rights_get_args *uap)
  287 {
  288         struct filedesc *fdp;
  289         cap_rights_t rights;
  290         int error, fd, i, n;
  291 
  292         if (uap->version != CAP_RIGHTS_VERSION_00)
  293                 return (EINVAL);
  294 
  295         fd = uap->fd;
  296 
  297         AUDIT_ARG_FD(fd);
  298 
  299         fdp = td->td_proc->p_fd;
  300         FILEDESC_SLOCK(fdp);
  301         if (fget_locked(fdp, fd) == NULL) {
  302                 FILEDESC_SUNLOCK(fdp);
  303                 return (EBADF);
  304         }
  305         rights = *cap_rights(fdp, fd);
  306         FILEDESC_SUNLOCK(fdp);
  307         n = uap->version + 2;
  308         if (uap->version != CAPVER(&rights)) {
  309                 /*
  310                  * For older versions we need to check if the descriptor
  311                  * doesn't contain rights not understood by the caller.
  312                  * If it does, we have to return an error.
  313                  */
  314                 for (i = n; i < CAPARSIZE(&rights); i++) {
  315                         if ((rights.cr_rights[i] & ~(0x7FULL << 57)) != 0)
  316                                 return (EINVAL);
  317                 }
  318         }
  319         error = copyout(&rights, uap->rightsp, sizeof(rights.cr_rights[0]) * n);
  320 #ifdef KTRACE
  321         if (error == 0 && KTRPOINT(td, KTR_STRUCT))
  322                 ktrcaprights(&rights);
  323 #endif
  324         return (error);
  325 }
  326 
  327 /*
  328  * Test whether a capability grants the given ioctl command.
  329  * If descriptor doesn't have CAP_IOCTL, then ioctls list is empty and
  330  * ENOTCAPABLE will be returned.
  331  */
  332 int
  333 cap_ioctl_check(struct filedesc *fdp, int fd, u_long cmd)
  334 {
  335         u_long *cmds;
  336         ssize_t ncmds;
  337         long i;
  338 
  339         FILEDESC_LOCK_ASSERT(fdp);
  340         KASSERT(fd >= 0 && fd < fdp->fd_nfiles,
  341             ("%s: invalid fd=%d", __func__, fd));
  342 
  343         ncmds = fdp->fd_ofiles[fd].fde_nioctls;
  344         if (ncmds == -1)
  345                 return (0);
  346 
  347         cmds = fdp->fd_ofiles[fd].fde_ioctls;
  348         for (i = 0; i < ncmds; i++) {
  349                 if (cmds[i] == cmd)
  350                         return (0);
  351         }
  352 
  353         return (ENOTCAPABLE);
  354 }
  355 
  356 /*
  357  * Check if the current ioctls list can be replaced by the new one.
  358  */
  359 static int
  360 cap_ioctl_limit_check(struct filedesc *fdp, int fd, const u_long *cmds,
  361     size_t ncmds)
  362 {
  363         u_long *ocmds;
  364         ssize_t oncmds;
  365         u_long i;
  366         long j;
  367 
  368         oncmds = fdp->fd_ofiles[fd].fde_nioctls;
  369         if (oncmds == -1)
  370                 return (0);
  371         if (oncmds < (ssize_t)ncmds)
  372                 return (ENOTCAPABLE);
  373 
  374         ocmds = fdp->fd_ofiles[fd].fde_ioctls;
  375         for (i = 0; i < ncmds; i++) {
  376                 for (j = 0; j < oncmds; j++) {
  377                         if (cmds[i] == ocmds[j])
  378                                 break;
  379                 }
  380                 if (j == oncmds)
  381                         return (ENOTCAPABLE);
  382         }
  383 
  384         return (0);
  385 }
  386 
  387 int
  388 kern_cap_ioctls_limit(struct thread *td, int fd, u_long *cmds, size_t ncmds)
  389 {
  390         struct filedesc *fdp;
  391         u_long *ocmds;
  392         int error;
  393 
  394         AUDIT_ARG_FD(fd);
  395 
  396         fdp = td->td_proc->p_fd;
  397         FILEDESC_XLOCK(fdp);
  398 
  399         if (fget_locked(fdp, fd) == NULL) {
  400                 error = EBADF;
  401                 goto out;
  402         }
  403 
  404         error = cap_ioctl_limit_check(fdp, fd, cmds, ncmds);
  405         if (error != 0)
  406                 goto out;
  407 
  408         ocmds = fdp->fd_ofiles[fd].fde_ioctls;
  409         fdp->fd_ofiles[fd].fde_ioctls = cmds;
  410         fdp->fd_ofiles[fd].fde_nioctls = ncmds;
  411 
  412         cmds = ocmds;
  413         error = 0;
  414 out:
  415         FILEDESC_XUNLOCK(fdp);
  416         free(cmds, M_FILECAPS);
  417         return (error);
  418 }
  419 
  420 int
  421 sys_cap_ioctls_limit(struct thread *td, struct cap_ioctls_limit_args *uap)
  422 {
  423         u_long *cmds;
  424         size_t ncmds;
  425         int error;
  426 
  427         ncmds = uap->ncmds;
  428 
  429         if (ncmds > 256)        /* XXX: Is 256 sane? */
  430                 return (EINVAL);
  431 
  432         if (ncmds == 0) {
  433                 cmds = NULL;
  434         } else {
  435                 cmds = malloc(sizeof(cmds[0]) * ncmds, M_FILECAPS, M_WAITOK);
  436                 error = copyin(uap->cmds, cmds, sizeof(cmds[0]) * ncmds);
  437                 if (error != 0) {
  438                         free(cmds, M_FILECAPS);
  439                         return (error);
  440                 }
  441         }
  442 
  443         return (kern_cap_ioctls_limit(td, uap->fd, cmds, ncmds));
  444 }
  445 
  446 int
  447 sys_cap_ioctls_get(struct thread *td, struct cap_ioctls_get_args *uap)
  448 {
  449         struct filedesc *fdp;
  450         struct filedescent *fdep;
  451         u_long *cmds;
  452         size_t maxcmds;
  453         int error, fd;
  454 
  455         fd = uap->fd;
  456         cmds = uap->cmds;
  457         maxcmds = uap->maxcmds;
  458 
  459         AUDIT_ARG_FD(fd);
  460 
  461         fdp = td->td_proc->p_fd;
  462         FILEDESC_SLOCK(fdp);
  463 
  464         if (fget_locked(fdp, fd) == NULL) {
  465                 error = EBADF;
  466                 goto out;
  467         }
  468 
  469         /*
  470          * If all ioctls are allowed (fde_nioctls == -1 && fde_ioctls == NULL)
  471          * the only sane thing we can do is to not populate the given array and
  472          * return CAP_IOCTLS_ALL.
  473          */
  474 
  475         fdep = &fdp->fd_ofiles[fd];
  476         if (cmds != NULL && fdep->fde_ioctls != NULL) {
  477                 error = copyout(fdep->fde_ioctls, cmds,
  478                     sizeof(cmds[0]) * MIN(fdep->fde_nioctls, maxcmds));
  479                 if (error != 0)
  480                         goto out;
  481         }
  482         if (fdep->fde_nioctls == -1)
  483                 td->td_retval[0] = CAP_IOCTLS_ALL;
  484         else
  485                 td->td_retval[0] = fdep->fde_nioctls;
  486 
  487         error = 0;
  488 out:
  489         FILEDESC_SUNLOCK(fdp);
  490         return (error);
  491 }
  492 
  493 /*
  494  * Test whether a capability grants the given fcntl command.
  495  */
  496 int
  497 cap_fcntl_check_fde(struct filedescent *fde, int cmd)
  498 {
  499         uint32_t fcntlcap;
  500 
  501         fcntlcap = (1 << cmd);
  502         KASSERT((CAP_FCNTL_ALL & fcntlcap) != 0,
  503             ("Unsupported fcntl=%d.", cmd));
  504 
  505         if ((fde->fde_fcntls & fcntlcap) != 0)
  506                 return (0);
  507 
  508         return (ENOTCAPABLE);
  509 }
  510 
  511 int
  512 cap_fcntl_check(struct filedesc *fdp, int fd, int cmd)
  513 {
  514 
  515         KASSERT(fd >= 0 && fd < fdp->fd_nfiles,
  516             ("%s: invalid fd=%d", __func__, fd));
  517 
  518         return (cap_fcntl_check_fde(&fdp->fd_ofiles[fd], cmd));
  519 }
  520 
  521 int
  522 sys_cap_fcntls_limit(struct thread *td, struct cap_fcntls_limit_args *uap)
  523 {
  524         struct filedesc *fdp;
  525         uint32_t fcntlrights;
  526         int fd;
  527 
  528         fd = uap->fd;
  529         fcntlrights = uap->fcntlrights;
  530 
  531         AUDIT_ARG_FD(fd);
  532         AUDIT_ARG_FCNTL_RIGHTS(fcntlrights);
  533 
  534         if ((fcntlrights & ~CAP_FCNTL_ALL) != 0)
  535                 return (EINVAL);
  536 
  537         fdp = td->td_proc->p_fd;
  538         FILEDESC_XLOCK(fdp);
  539 
  540         if (fget_locked(fdp, fd) == NULL) {
  541                 FILEDESC_XUNLOCK(fdp);
  542                 return (EBADF);
  543         }
  544 
  545         if ((fcntlrights & ~fdp->fd_ofiles[fd].fde_fcntls) != 0) {
  546                 FILEDESC_XUNLOCK(fdp);
  547                 return (ENOTCAPABLE);
  548         }
  549 
  550         fdp->fd_ofiles[fd].fde_fcntls = fcntlrights;
  551         FILEDESC_XUNLOCK(fdp);
  552 
  553         return (0);
  554 }
  555 
  556 int
  557 sys_cap_fcntls_get(struct thread *td, struct cap_fcntls_get_args *uap)
  558 {
  559         struct filedesc *fdp;
  560         uint32_t rights;
  561         int fd;
  562 
  563         fd = uap->fd;
  564 
  565         AUDIT_ARG_FD(fd);
  566 
  567         fdp = td->td_proc->p_fd;
  568         FILEDESC_SLOCK(fdp);
  569         if (fget_locked(fdp, fd) == NULL) {
  570                 FILEDESC_SUNLOCK(fdp);
  571                 return (EBADF);
  572         }
  573         rights = fdp->fd_ofiles[fd].fde_fcntls;
  574         FILEDESC_SUNLOCK(fdp);
  575 
  576         return (copyout(&rights, uap->fcntlrightsp, sizeof(rights)));
  577 }
  578 
  579 #else /* !CAPABILITIES */
  580 
  581 /*
  582  * Stub Capability functions for when options CAPABILITIES isn't compiled
  583  * into the kernel.
  584  */
  585 
  586 int
  587 sys_cap_rights_limit(struct thread *td, struct cap_rights_limit_args *uap)
  588 {
  589 
  590         return (ENOSYS);
  591 }
  592 
  593 int
  594 sys___cap_rights_get(struct thread *td, struct __cap_rights_get_args *uap)
  595 {
  596 
  597         return (ENOSYS);
  598 }
  599 
  600 int
  601 sys_cap_ioctls_limit(struct thread *td, struct cap_ioctls_limit_args *uap)
  602 {
  603 
  604         return (ENOSYS);
  605 }
  606 
  607 int
  608 sys_cap_ioctls_get(struct thread *td, struct cap_ioctls_get_args *uap)
  609 {
  610 
  611         return (ENOSYS);
  612 }
  613 
  614 int
  615 sys_cap_fcntls_limit(struct thread *td, struct cap_fcntls_limit_args *uap)
  616 {
  617 
  618         return (ENOSYS);
  619 }
  620 
  621 int
  622 sys_cap_fcntls_get(struct thread *td, struct cap_fcntls_get_args *uap)
  623 {
  624 
  625         return (ENOSYS);
  626 }
  627 
  628 #endif /* CAPABILITIES */

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