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![Mariusz Zaborski](/assets/img/avatar_default.png)
Change the nvlist_recv() function to take additional argument that specifies flags expected on the received nvlist. Receiving a nvlist with different set of flags than the ones we expect might lead to undefined behaviour, which might be potentially dangerous. Update consumers of this and related functions and update the tests. Approved by: pjd (mentor) Update man page for nvlist_unpack, nvlist_recv, nvlist_xfer, cap_recv_nvlist and cap_xfer_nvlist. Reviewed by: AllanJude Approved by: pjd (mentor)
393 lines
9.2 KiB
C
393 lines
9.2 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/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <pwd.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 <nv.h>
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#include "libcapsicum.h"
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#include "libcapsicum_pwd.h"
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static struct passwd gpwd;
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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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passwd_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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passwd_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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passwd_unpack(const nvlist_t *nvl, struct passwd *pwd, 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, "pw_name"))
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return (EINVAL);
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memset(pwd, 0, sizeof(*pwd));
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error = passwd_unpack_string(nvl, "pw_name", &pwd->pw_name, &buffer,
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&bufsize);
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if (error != 0)
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return (error);
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pwd->pw_uid = (uid_t)nvlist_get_number(nvl, "pw_uid");
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pwd->pw_gid = (gid_t)nvlist_get_number(nvl, "pw_gid");
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pwd->pw_change = (time_t)nvlist_get_number(nvl, "pw_change");
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error = passwd_unpack_string(nvl, "pw_passwd", &pwd->pw_passwd, &buffer,
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&bufsize);
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if (error != 0)
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return (error);
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error = passwd_unpack_string(nvl, "pw_class", &pwd->pw_class, &buffer,
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&bufsize);
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if (error != 0)
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return (error);
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error = passwd_unpack_string(nvl, "pw_gecos", &pwd->pw_gecos, &buffer,
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&bufsize);
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if (error != 0)
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return (error);
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error = passwd_unpack_string(nvl, "pw_dir", &pwd->pw_dir, &buffer,
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&bufsize);
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if (error != 0)
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return (error);
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error = passwd_unpack_string(nvl, "pw_shell", &pwd->pw_shell, &buffer,
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&bufsize);
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if (error != 0)
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return (error);
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pwd->pw_expire = (time_t)nvlist_get_number(nvl, "pw_expire");
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pwd->pw_fields = (int)nvlist_get_number(nvl, "pw_fields");
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return (0);
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}
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static int
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cap_getpwcommon_r(cap_channel_t *chan, const char *cmd, const char *login,
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uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize,
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struct passwd **result)
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{
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nvlist_t *nvl;
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bool getpw_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, "getpwent") == 0 || strcmp(cmd, "getpwent_r") == 0) {
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/* Add nothing. */
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} else if (strcmp(cmd, "getpwnam") == 0 ||
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strcmp(cmd, "getpwnam_r") == 0) {
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nvlist_add_string(nvl, "name", login);
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} else if (strcmp(cmd, "getpwuid") == 0 ||
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strcmp(cmd, "getpwuid_r") == 0) {
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nvlist_add_number(nvl, "uid", (uint64_t)uid);
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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, "pw_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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getpw_r = (strcmp(cmd, "getpwent_r") == 0 ||
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strcmp(cmd, "getpwnam_r") == 0 || strcmp(cmd, "getpwuid_r") == 0);
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for (;;) {
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error = passwd_unpack(nvl, pwd, buffer, bufsize);
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if (getpw_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 = passwd_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 = pwd;
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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 passwd *
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cap_getpwcommon(cap_channel_t *chan, const char *cmd, const char *login,
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uid_t uid)
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{
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struct passwd *result;
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int error, serrno;
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serrno = errno;
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error = cap_getpwcommon_r(chan, cmd, login, uid, &gpwd, 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 passwd *
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cap_getpwent(cap_channel_t *chan)
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{
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return (cap_getpwcommon(chan, "getpwent", NULL, 0));
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}
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struct passwd *
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cap_getpwnam(cap_channel_t *chan, const char *login)
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{
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return (cap_getpwcommon(chan, "getpwnam", login, 0));
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}
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struct passwd *
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cap_getpwuid(cap_channel_t *chan, uid_t uid)
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{
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return (cap_getpwcommon(chan, "getpwuid", NULL, uid));
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}
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int
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cap_getpwent_r(cap_channel_t *chan, struct passwd *pwd, char *buffer,
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size_t bufsize, struct passwd **result)
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{
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return (cap_getpwcommon_r(chan, "getpwent_r", NULL, 0, pwd, buffer,
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bufsize, result));
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}
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int
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cap_getpwnam_r(cap_channel_t *chan, const char *name, struct passwd *pwd,
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char *buffer, size_t bufsize, struct passwd **result)
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{
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return (cap_getpwcommon_r(chan, "getpwnam_r", name, 0, pwd, buffer,
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bufsize, result));
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}
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int
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cap_getpwuid_r(cap_channel_t *chan, uid_t uid, struct passwd *pwd, char *buffer,
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size_t bufsize, struct passwd **result)
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{
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return (cap_getpwcommon_r(chan, "getpwuid_r", NULL, uid, pwd, buffer,
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bufsize, result));
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}
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int
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cap_setpassent(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", "setpassent");
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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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static void
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cap_set_end_pwent(cap_channel_t *chan, const char *cmd)
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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", cmd);
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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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void
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cap_setpwent(cap_channel_t *chan)
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{
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cap_set_end_pwent(chan, "setpwent");
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}
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void
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cap_endpwent(cap_channel_t *chan)
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{
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cap_set_end_pwent(chan, "endpwent");
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}
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int
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cap_pwd_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_pwd_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_pwd_limit_users(cap_channel_t *chan, const char * const *names,
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size_t nnames, uid_t *uids, size_t nuids)
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{
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nvlist_t *limits, *users;
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char nvlname[64];
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unsigned int i;
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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, "users"))
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nvlist_free_nvlist(limits, "users");
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}
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users = nvlist_create(0);
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for (i = 0; i < nuids; i++) {
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n = snprintf(nvlname, sizeof(nvlname), "uid%u", i);
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assert(n > 0 && n < (int)sizeof(nvlname));
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nvlist_add_number(users, nvlname, (uint64_t)uids[i]);
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}
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for (i = 0; i < nnames; i++) {
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n = snprintf(nvlname, sizeof(nvlname), "name%u", i);
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assert(n > 0 && n < (int)sizeof(nvlname));
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nvlist_add_string(users, nvlname, names[i]);
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}
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nvlist_move_nvlist(limits, "users", users);
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return (cap_limit_set(chan, limits));
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}
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