Change consumers to include those files from sys. Add duplicated files to ObsoleteFiles. Approved by: pjd (mentor)
439 lines
10 KiB
C
439 lines
10 KiB
C
/*-
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/dnv.h>
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#include <sys/nv.h>
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#include <sys/param.h>
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#include <assert.h>
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#include <errno.h>
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#include <grp.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "libcapsicum.h"
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#include "libcapsicum_grp.h"
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static struct group ggrp;
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static char *gbuffer;
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static size_t gbufsize;
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static int
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group_resize(void)
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{
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char *buf;
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if (gbufsize == 0)
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gbufsize = 1024;
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else
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gbufsize *= 2;
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buf = gbuffer;
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gbuffer = realloc(buf, gbufsize);
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if (gbuffer == NULL) {
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free(buf);
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gbufsize = 0;
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return (ENOMEM);
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}
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memset(gbuffer, 0, gbufsize);
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return (0);
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}
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static int
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group_unpack_string(const nvlist_t *nvl, const char *fieldname, char **fieldp,
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char **bufferp, size_t *bufsizep)
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{
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const char *str;
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size_t len;
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str = nvlist_get_string(nvl, fieldname);
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len = strlcpy(*bufferp, str, *bufsizep);
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if (len >= *bufsizep)
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return (ERANGE);
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*fieldp = *bufferp;
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*bufferp += len + 1;
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*bufsizep -= len + 1;
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return (0);
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}
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static int
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group_unpack_members(const nvlist_t *nvl, char ***fieldp, char **bufferp,
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size_t *bufsizep)
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{
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const char *mem;
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char **outstrs, *str, nvlname[64];
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size_t nmem, datasize, strsize;
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unsigned int ii;
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int n;
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if (!nvlist_exists_number(nvl, "gr_nmem")) {
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datasize = _ALIGNBYTES + sizeof(char *);
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if (datasize >= *bufsizep)
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return (ERANGE);
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outstrs = (char **)_ALIGN(*bufferp);
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outstrs[0] = NULL;
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*fieldp = outstrs;
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*bufferp += datasize;
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*bufsizep -= datasize;
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return (0);
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}
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nmem = (size_t)nvlist_get_number(nvl, "gr_nmem");
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datasize = _ALIGNBYTES + sizeof(char *) * (nmem + 1);
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for (ii = 0; ii < nmem; ii++) {
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n = snprintf(nvlname, sizeof(nvlname), "gr_mem[%u]", ii);
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assert(n > 0 && n < (int)sizeof(nvlname));
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mem = dnvlist_get_string(nvl, nvlname, NULL);
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if (mem == NULL)
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return (EINVAL);
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datasize += strlen(mem) + 1;
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}
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if (datasize >= *bufsizep)
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return (ERANGE);
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outstrs = (char **)_ALIGN(*bufferp);
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str = (char *)outstrs + sizeof(char *) * (nmem + 1);
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for (ii = 0; ii < nmem; ii++) {
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n = snprintf(nvlname, sizeof(nvlname), "gr_mem[%u]", ii);
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assert(n > 0 && n < (int)sizeof(nvlname));
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mem = nvlist_get_string(nvl, nvlname);
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strsize = strlen(mem) + 1;
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memcpy(str, mem, strsize);
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outstrs[ii] = str;
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str += strsize;
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}
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assert(ii == nmem);
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outstrs[ii] = NULL;
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*fieldp = outstrs;
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*bufferp += datasize;
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*bufsizep -= datasize;
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return (0);
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}
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static int
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group_unpack(const nvlist_t *nvl, struct group *grp, char *buffer,
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size_t bufsize)
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{
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int error;
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if (!nvlist_exists_string(nvl, "gr_name"))
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return (EINVAL);
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memset(grp, 0, sizeof(*grp));
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error = group_unpack_string(nvl, "gr_name", &grp->gr_name, &buffer,
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&bufsize);
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if (error != 0)
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return (error);
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error = group_unpack_string(nvl, "gr_passwd", &grp->gr_passwd, &buffer,
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&bufsize);
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if (error != 0)
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return (error);
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grp->gr_gid = (gid_t)nvlist_get_number(nvl, "gr_gid");
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error = group_unpack_members(nvl, &grp->gr_mem, &buffer, &bufsize);
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if (error != 0)
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return (error);
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return (0);
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}
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static int
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cap_getgrcommon_r(cap_channel_t *chan, const char *cmd, const char *name,
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gid_t gid, struct group *grp, char *buffer, size_t bufsize,
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struct group **result)
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{
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nvlist_t *nvl;
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bool getgr_r;
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int error;
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", cmd);
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if (strcmp(cmd, "getgrent") == 0 || strcmp(cmd, "getgrent_r") == 0) {
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/* Add nothing. */
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} else if (strcmp(cmd, "getgrnam") == 0 ||
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strcmp(cmd, "getgrnam_r") == 0) {
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nvlist_add_string(nvl, "name", name);
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} else if (strcmp(cmd, "getgrgid") == 0 ||
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strcmp(cmd, "getgrgid_r") == 0) {
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nvlist_add_number(nvl, "gid", (uint64_t)gid);
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} else {
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abort();
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}
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nvl = cap_xfer_nvlist(chan, nvl, 0);
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if (nvl == NULL) {
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assert(errno != 0);
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*result = NULL;
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return (errno);
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}
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error = (int)nvlist_get_number(nvl, "error");
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if (error != 0) {
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nvlist_destroy(nvl);
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*result = NULL;
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return (error);
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}
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if (!nvlist_exists_string(nvl, "gr_name")) {
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/* Not found. */
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nvlist_destroy(nvl);
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*result = NULL;
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return (0);
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}
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getgr_r = (strcmp(cmd, "getgrent_r") == 0 ||
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strcmp(cmd, "getgrnam_r") == 0 || strcmp(cmd, "getgrgid_r") == 0);
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for (;;) {
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error = group_unpack(nvl, grp, buffer, bufsize);
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if (getgr_r || error != ERANGE)
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break;
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assert(buffer == gbuffer);
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assert(bufsize == gbufsize);
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error = group_resize();
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if (error != 0)
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break;
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/* Update pointers after resize. */
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buffer = gbuffer;
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bufsize = gbufsize;
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}
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nvlist_destroy(nvl);
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if (error == 0)
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*result = grp;
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else
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*result = NULL;
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return (error);
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}
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static struct group *
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cap_getgrcommon(cap_channel_t *chan, const char *cmd, const char *name,
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gid_t gid)
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{
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struct group *result;
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int error, serrno;
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serrno = errno;
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error = cap_getgrcommon_r(chan, cmd, name, gid, &ggrp, gbuffer,
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gbufsize, &result);
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if (error != 0) {
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errno = error;
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return (NULL);
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}
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errno = serrno;
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return (result);
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}
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struct group *
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cap_getgrent(cap_channel_t *chan)
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{
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return (cap_getgrcommon(chan, "getgrent", NULL, 0));
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}
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struct group *
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cap_getgrnam(cap_channel_t *chan, const char *name)
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{
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return (cap_getgrcommon(chan, "getgrnam", name, 0));
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}
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struct group *
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cap_getgrgid(cap_channel_t *chan, gid_t gid)
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{
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return (cap_getgrcommon(chan, "getgrgid", NULL, gid));
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}
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int
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cap_getgrent_r(cap_channel_t *chan, struct group *grp, char *buffer,
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size_t bufsize, struct group **result)
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{
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return (cap_getgrcommon_r(chan, "getgrent_r", NULL, 0, grp, buffer,
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bufsize, result));
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}
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int
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cap_getgrnam_r(cap_channel_t *chan, const char *name, struct group *grp,
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char *buffer, size_t bufsize, struct group **result)
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{
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return (cap_getgrcommon_r(chan, "getgrnam_r", name, 0, grp, buffer,
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bufsize, result));
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}
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int
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cap_getgrgid_r(cap_channel_t *chan, gid_t gid, struct group *grp, char *buffer,
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size_t bufsize, struct group **result)
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{
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return (cap_getgrcommon_r(chan, "getgrgid_r", NULL, gid, grp, buffer,
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bufsize, result));
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}
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int
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cap_setgroupent(cap_channel_t *chan, int stayopen)
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{
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nvlist_t *nvl;
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "setgroupent");
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nvlist_add_bool(nvl, "stayopen", stayopen != 0);
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nvl = cap_xfer_nvlist(chan, nvl, 0);
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if (nvl == NULL)
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return (0);
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if (nvlist_get_number(nvl, "error") != 0) {
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errno = nvlist_get_number(nvl, "error");
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nvlist_destroy(nvl);
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return (0);
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}
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nvlist_destroy(nvl);
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return (1);
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}
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int
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cap_setgrent(cap_channel_t *chan)
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{
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nvlist_t *nvl;
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "setgrent");
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nvl = cap_xfer_nvlist(chan, nvl, 0);
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if (nvl == NULL)
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return (0);
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if (nvlist_get_number(nvl, "error") != 0) {
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errno = nvlist_get_number(nvl, "error");
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nvlist_destroy(nvl);
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return (0);
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}
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nvlist_destroy(nvl);
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return (1);
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}
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void
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cap_endgrent(cap_channel_t *chan)
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{
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nvlist_t *nvl;
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "endgrent");
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/* Ignore any errors, we have no way to report them. */
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nvlist_destroy(cap_xfer_nvlist(chan, nvl, 0));
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}
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int
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cap_grp_limit_cmds(cap_channel_t *chan, const char * const *cmds, size_t ncmds)
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{
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nvlist_t *limits, *nvl;
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unsigned int i;
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if (cap_limit_get(chan, &limits) < 0)
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return (-1);
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if (limits == NULL) {
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limits = nvlist_create(0);
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} else {
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if (nvlist_exists_nvlist(limits, "cmds"))
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nvlist_free_nvlist(limits, "cmds");
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}
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nvl = nvlist_create(0);
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for (i = 0; i < ncmds; i++)
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nvlist_add_null(nvl, cmds[i]);
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nvlist_move_nvlist(limits, "cmds", nvl);
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return (cap_limit_set(chan, limits));
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}
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int
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cap_grp_limit_fields(cap_channel_t *chan, const char * const *fields,
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size_t nfields)
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{
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nvlist_t *limits, *nvl;
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unsigned int i;
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if (cap_limit_get(chan, &limits) < 0)
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return (-1);
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if (limits == NULL) {
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limits = nvlist_create(0);
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} else {
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if (nvlist_exists_nvlist(limits, "fields"))
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nvlist_free_nvlist(limits, "fields");
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}
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nvl = nvlist_create(0);
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for (i = 0; i < nfields; i++)
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nvlist_add_null(nvl, fields[i]);
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nvlist_move_nvlist(limits, "fields", nvl);
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return (cap_limit_set(chan, limits));
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}
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int
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cap_grp_limit_groups(cap_channel_t *chan, const char * const *names,
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size_t nnames, gid_t *gids, size_t ngids)
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{
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nvlist_t *limits, *groups;
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unsigned int i;
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char nvlname[64];
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int n;
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if (cap_limit_get(chan, &limits) < 0)
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return (-1);
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if (limits == NULL) {
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limits = nvlist_create(0);
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} else {
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if (nvlist_exists_nvlist(limits, "groups"))
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nvlist_free_nvlist(limits, "groups");
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}
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groups = nvlist_create(0);
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for (i = 0; i < ngids; i++) {
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n = snprintf(nvlname, sizeof(nvlname), "gid%u", i);
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assert(n > 0 && n < (int)sizeof(nvlname));
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nvlist_add_number(groups, nvlname, (uint64_t)gids[i]);
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}
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for (i = 0; i < nnames; i++) {
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n = snprintf(nvlname, sizeof(nvlname), "gid%u", i);
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assert(n > 0 && n < (int)sizeof(nvlname));
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nvlist_add_string(groups, nvlname, names[i]);
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}
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nvlist_move_nvlist(limits, "groups", groups);
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return (cap_limit_set(chan, limits));
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}
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