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freebsd-dev/lib/libugidfw/ugidfw.c
Pedro F. Giffuni 5e53a4f90f lib: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-26 02:00:33 +00:00

1308 lines
29 KiB
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2002-2005 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Network Associates
* Laboratories, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <security/mac_bsdextended/mac_bsdextended.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ugidfw.h"
/*
* Text format for rules: rules contain subject and object elements, mode.
* The total form is "subject [s_element] object [o_element] mode [mode]".
* At least * one of a uid or gid entry must be present; both may also be
* present.
*/
#define MIB "security.mac.bsdextended"
int
bsde_rule_to_string(struct mac_bsdextended_rule *rule, char *buf, size_t buflen)
{
struct group *grp;
struct passwd *pwd;
struct statfs *mntbuf;
char *cur, type[sizeof(rule->mbr_object.mbo_type) * CHAR_BIT + 1];
size_t left, len;
int anymode, unknownmode, numfs, i, notdone;
cur = buf;
left = buflen;
len = snprintf(cur, left, "subject ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
if (rule->mbr_subject.mbs_flags) {
if (rule->mbr_subject.mbs_neg == MBS_ALL_FLAGS) {
len = snprintf(cur, left, "not ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
notdone = 1;
} else {
notdone = 0;
}
if (!notdone && (rule->mbr_subject.mbs_neg & MBO_UID_DEFINED)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_subject.mbs_flags & MBO_UID_DEFINED) {
pwd = getpwuid(rule->mbr_subject.mbs_uid_min);
if (pwd != NULL) {
len = snprintf(cur, left, "uid %s",
pwd->pw_name);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
} else {
len = snprintf(cur, left, "uid %u",
rule->mbr_subject.mbs_uid_min);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_subject.mbs_uid_min !=
rule->mbr_subject.mbs_uid_max) {
pwd = getpwuid(rule->mbr_subject.mbs_uid_max);
if (pwd != NULL) {
len = snprintf(cur, left, ":%s ",
pwd->pw_name);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
} else {
len = snprintf(cur, left, ":%u ",
rule->mbr_subject.mbs_uid_max);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
} else {
len = snprintf(cur, left, " ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
}
if (!notdone && (rule->mbr_subject.mbs_neg & MBO_GID_DEFINED)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_subject.mbs_flags & MBO_GID_DEFINED) {
grp = getgrgid(rule->mbr_subject.mbs_gid_min);
if (grp != NULL) {
len = snprintf(cur, left, "gid %s",
grp->gr_name);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
} else {
len = snprintf(cur, left, "gid %u",
rule->mbr_subject.mbs_gid_min);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_subject.mbs_gid_min !=
rule->mbr_subject.mbs_gid_max) {
grp = getgrgid(rule->mbr_subject.mbs_gid_max);
if (grp != NULL) {
len = snprintf(cur, left, ":%s ",
grp->gr_name);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
} else {
len = snprintf(cur, left, ":%u ",
rule->mbr_subject.mbs_gid_max);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
} else {
len = snprintf(cur, left, " ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
}
if (!notdone && (rule->mbr_subject.mbs_neg & MBS_PRISON_DEFINED)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_subject.mbs_flags & MBS_PRISON_DEFINED) {
len = snprintf(cur, left, "jailid %d ",
rule->mbr_subject.mbs_prison);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
}
len = snprintf(cur, left, "object ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
if (rule->mbr_object.mbo_flags) {
if (rule->mbr_object.mbo_neg == MBO_ALL_FLAGS) {
len = snprintf(cur, left, "not ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
notdone = 1;
} else {
notdone = 0;
}
if (!notdone && (rule->mbr_object.mbo_neg & MBO_UID_DEFINED)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_UID_DEFINED) {
pwd = getpwuid(rule->mbr_object.mbo_uid_min);
if (pwd != NULL) {
len = snprintf(cur, left, "uid %s",
pwd->pw_name);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
} else {
len = snprintf(cur, left, "uid %u",
rule->mbr_object.mbo_uid_min);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_uid_min !=
rule->mbr_object.mbo_uid_max) {
pwd = getpwuid(rule->mbr_object.mbo_uid_max);
if (pwd != NULL) {
len = snprintf(cur, left, ":%s ",
pwd->pw_name);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
} else {
len = snprintf(cur, left, ":%u ",
rule->mbr_object.mbo_uid_max);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
} else {
len = snprintf(cur, left, " ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
}
if (!notdone && (rule->mbr_object.mbo_neg & MBO_GID_DEFINED)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_GID_DEFINED) {
grp = getgrgid(rule->mbr_object.mbo_gid_min);
if (grp != NULL) {
len = snprintf(cur, left, "gid %s",
grp->gr_name);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
} else {
len = snprintf(cur, left, "gid %u",
rule->mbr_object.mbo_gid_min);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_gid_min !=
rule->mbr_object.mbo_gid_max) {
grp = getgrgid(rule->mbr_object.mbo_gid_max);
if (grp != NULL) {
len = snprintf(cur, left, ":%s ",
grp->gr_name);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
} else {
len = snprintf(cur, left, ":%u ",
rule->mbr_object.mbo_gid_max);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
} else {
len = snprintf(cur, left, " ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
}
if (!notdone && (rule->mbr_object.mbo_neg & MBO_FSID_DEFINED)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_FSID_DEFINED) {
numfs = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < numfs; i++)
if (memcmp(&(rule->mbr_object.mbo_fsid),
&(mntbuf[i].f_fsid),
sizeof(mntbuf[i].f_fsid)) == 0)
break;
len = snprintf(cur, left, "filesys %s ",
i == numfs ? "???" : mntbuf[i].f_mntonname);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (!notdone && (rule->mbr_object.mbo_neg & MBO_SUID)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_SUID) {
len = snprintf(cur, left, "suid ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (!notdone && (rule->mbr_object.mbo_neg & MBO_SGID)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_SGID) {
len = snprintf(cur, left, "sgid ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (!notdone && (rule->mbr_object.mbo_neg & MBO_UID_SUBJECT)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_UID_SUBJECT) {
len = snprintf(cur, left, "uid_of_subject ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (!notdone && (rule->mbr_object.mbo_neg & MBO_GID_SUBJECT)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_GID_SUBJECT) {
len = snprintf(cur, left, "gid_of_subject ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (!notdone && (rule->mbr_object.mbo_neg & MBO_TYPE_DEFINED)) {
len = snprintf(cur, left, "! ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_object.mbo_flags & MBO_TYPE_DEFINED) {
i = 0;
if (rule->mbr_object.mbo_type & MBO_TYPE_REG)
type[i++] = 'r';
if (rule->mbr_object.mbo_type & MBO_TYPE_DIR)
type[i++] = 'd';
if (rule->mbr_object.mbo_type & MBO_TYPE_BLK)
type[i++] = 'b';
if (rule->mbr_object.mbo_type & MBO_TYPE_CHR)
type[i++] = 'c';
if (rule->mbr_object.mbo_type & MBO_TYPE_LNK)
type[i++] = 'l';
if (rule->mbr_object.mbo_type & MBO_TYPE_SOCK)
type[i++] = 's';
if (rule->mbr_object.mbo_type & MBO_TYPE_FIFO)
type[i++] = 'p';
if (rule->mbr_object.mbo_type == MBO_ALL_TYPE) {
i = 0;
type[i++] = 'a';
}
type[i++] = '\0';
len = snprintf(cur, left, "type %s ", type);
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
}
len = snprintf(cur, left, "mode ");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
anymode = (rule->mbr_mode & MBI_ALLPERM);
unknownmode = (rule->mbr_mode & ~MBI_ALLPERM);
if (rule->mbr_mode & MBI_ADMIN) {
len = snprintf(cur, left, "a");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_mode & MBI_READ) {
len = snprintf(cur, left, "r");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_mode & MBI_STAT) {
len = snprintf(cur, left, "s");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_mode & MBI_WRITE) {
len = snprintf(cur, left, "w");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (rule->mbr_mode & MBI_EXEC) {
len = snprintf(cur, left, "x");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (!anymode) {
len = snprintf(cur, left, "n");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
if (unknownmode) {
len = snprintf(cur, left, "?");
if (len < 0 || len > left)
goto truncated;
left -= len;
cur += len;
}
return (0);
truncated:
return (-1);
}
static int
bsde_parse_uidrange(char *spec, uid_t *min, uid_t *max,
size_t buflen, char *errstr){
struct passwd *pwd;
uid_t uid1, uid2;
char *spec1, *spec2, *endp;
unsigned long value;
spec2 = spec;
spec1 = strsep(&spec2, ":");
pwd = getpwnam(spec1);
if (pwd != NULL)
uid1 = pwd->pw_uid;
else {
value = strtoul(spec1, &endp, 10);
if (*endp != '\0') {
snprintf(errstr, buflen, "invalid uid: '%s'", spec1);
return (-1);
}
uid1 = value;
}
if (spec2 == NULL) {
*max = *min = uid1;
return (0);
}
pwd = getpwnam(spec2);
if (pwd != NULL)
uid2 = pwd->pw_uid;
else {
value = strtoul(spec2, &endp, 10);
if (*endp != '\0') {
snprintf(errstr, buflen, "invalid uid: '%s'", spec2);
return (-1);
}
uid2 = value;
}
*min = uid1;
*max = uid2;
return (0);
}
static int
bsde_parse_gidrange(char *spec, gid_t *min, gid_t *max,
size_t buflen, char *errstr){
struct group *grp;
gid_t gid1, gid2;
char *spec1, *spec2, *endp;
unsigned long value;
spec2 = spec;
spec1 = strsep(&spec2, ":");
grp = getgrnam(spec1);
if (grp != NULL)
gid1 = grp->gr_gid;
else {
value = strtoul(spec1, &endp, 10);
if (*endp != '\0') {
snprintf(errstr, buflen, "invalid gid: '%s'", spec1);
return (-1);
}
gid1 = value;
}
if (spec2 == NULL) {
*max = *min = gid1;
return (0);
}
grp = getgrnam(spec2);
if (grp != NULL)
gid2 = grp->gr_gid;
else {
value = strtoul(spec2, &endp, 10);
if (*endp != '\0') {
snprintf(errstr, buflen, "invalid gid: '%s'", spec2);
return (-1);
}
gid2 = value;
}
*min = gid1;
*max = gid2;
return (0);
}
static int
bsde_parse_subject(int argc, char *argv[],
struct mac_bsdextended_subject *subject, size_t buflen, char *errstr)
{
int not_seen, flags;
int current, neg, nextnot;
char *endp;
uid_t uid_min, uid_max;
gid_t gid_min, gid_max;
int jid = 0;
long value;
current = 0;
flags = 0;
neg = 0;
nextnot = 0;
if (strcmp("not", argv[current]) == 0) {
not_seen = 1;
current++;
} else
not_seen = 0;
while (current < argc) {
if (strcmp(argv[current], "uid") == 0) {
if (current + 2 > argc) {
snprintf(errstr, buflen, "uid short");
return (-1);
}
if (flags & MBS_UID_DEFINED) {
snprintf(errstr, buflen, "one uid only");
return (-1);
}
if (bsde_parse_uidrange(argv[current+1],
&uid_min, &uid_max, buflen, errstr) < 0)
return (-1);
flags |= MBS_UID_DEFINED;
if (nextnot) {
neg ^= MBS_UID_DEFINED;
nextnot = 0;
}
current += 2;
} else if (strcmp(argv[current], "gid") == 0) {
if (current + 2 > argc) {
snprintf(errstr, buflen, "gid short");
return (-1);
}
if (flags & MBS_GID_DEFINED) {
snprintf(errstr, buflen, "one gid only");
return (-1);
}
if (bsde_parse_gidrange(argv[current+1],
&gid_min, &gid_max, buflen, errstr) < 0)
return (-1);
flags |= MBS_GID_DEFINED;
if (nextnot) {
neg ^= MBS_GID_DEFINED;
nextnot = 0;
}
current += 2;
} else if (strcmp(argv[current], "jailid") == 0) {
if (current + 2 > argc) {
snprintf(errstr, buflen, "prison short");
return (-1);
}
if (flags & MBS_PRISON_DEFINED) {
snprintf(errstr, buflen, "one jail only");
return (-1);
}
value = strtol(argv[current+1], &endp, 10);
if (*endp != '\0') {
snprintf(errstr, buflen, "invalid jid: '%s'",
argv[current+1]);
return (-1);
}
jid = value;
flags |= MBS_PRISON_DEFINED;
if (nextnot) {
neg ^= MBS_PRISON_DEFINED;
nextnot = 0;
}
current += 2;
} else if (strcmp(argv[current], "!") == 0) {
if (nextnot) {
snprintf(errstr, buflen, "double negative");
return (-1);
}
nextnot = 1;
current += 1;
} else {
snprintf(errstr, buflen, "'%s' not expected",
argv[current]);
return (-1);
}
}
subject->mbs_flags = flags;
if (not_seen)
subject->mbs_neg = MBS_ALL_FLAGS ^ neg;
else
subject->mbs_neg = neg;
if (flags & MBS_UID_DEFINED) {
subject->mbs_uid_min = uid_min;
subject->mbs_uid_max = uid_max;
}
if (flags & MBS_GID_DEFINED) {
subject->mbs_gid_min = gid_min;
subject->mbs_gid_max = gid_max;
}
if (flags & MBS_PRISON_DEFINED)
subject->mbs_prison = jid;
return (0);
}
static int
bsde_parse_type(char *spec, int *type, size_t buflen, char *errstr)
{
int i;
*type = 0;
for (i = 0; i < strlen(spec); i++) {
switch (spec[i]) {
case 'r':
case '-':
*type |= MBO_TYPE_REG;
break;
case 'd':
*type |= MBO_TYPE_DIR;
break;
case 'b':
*type |= MBO_TYPE_BLK;
break;
case 'c':
*type |= MBO_TYPE_CHR;
break;
case 'l':
*type |= MBO_TYPE_LNK;
break;
case 's':
*type |= MBO_TYPE_SOCK;
break;
case 'p':
*type |= MBO_TYPE_FIFO;
break;
case 'a':
*type |= MBO_ALL_TYPE;
break;
default:
snprintf(errstr, buflen, "Unknown type code: %c",
spec[i]);
return (-1);
}
}
return (0);
}
static int
bsde_parse_fsid(char *spec, struct fsid *fsid, size_t buflen, char *errstr)
{
struct statfs buf;
if (statfs(spec, &buf) < 0) {
snprintf(errstr, buflen, "Unable to get id for %s: %s",
spec, strerror(errno));
return (-1);
}
*fsid = buf.f_fsid;
return (0);
}
static int
bsde_parse_object(int argc, char *argv[],
struct mac_bsdextended_object *object, size_t buflen, char *errstr)
{
int not_seen, flags;
int current, neg, nextnot;
int type;
uid_t uid_min, uid_max;
gid_t gid_min, gid_max;
struct fsid fsid;
current = 0;
flags = 0;
neg = 0;
nextnot = 0;
type = 0;
if (strcmp("not", argv[current]) == 0) {
not_seen = 1;
current++;
} else
not_seen = 0;
while (current < argc) {
if (strcmp(argv[current], "uid") == 0) {
if (current + 2 > argc) {
snprintf(errstr, buflen, "uid short");
return (-1);
}
if (flags & MBO_UID_DEFINED) {
snprintf(errstr, buflen, "one uid only");
return (-1);
}
if (bsde_parse_uidrange(argv[current+1],
&uid_min, &uid_max, buflen, errstr) < 0)
return (-1);
flags |= MBO_UID_DEFINED;
if (nextnot) {
neg ^= MBO_UID_DEFINED;
nextnot = 0;
}
current += 2;
} else if (strcmp(argv[current], "gid") == 0) {
if (current + 2 > argc) {
snprintf(errstr, buflen, "gid short");
return (-1);
}
if (flags & MBO_GID_DEFINED) {
snprintf(errstr, buflen, "one gid only");
return (-1);
}
if (bsde_parse_gidrange(argv[current+1],
&gid_min, &gid_max, buflen, errstr) < 0)
return (-1);
flags |= MBO_GID_DEFINED;
if (nextnot) {
neg ^= MBO_GID_DEFINED;
nextnot = 0;
}
current += 2;
} else if (strcmp(argv[current], "filesys") == 0) {
if (current + 2 > argc) {
snprintf(errstr, buflen, "filesys short");
return (-1);
}
if (flags & MBO_FSID_DEFINED) {
snprintf(errstr, buflen, "one fsid only");
return (-1);
}
if (bsde_parse_fsid(argv[current+1], &fsid,
buflen, errstr) < 0)
return (-1);
flags |= MBO_FSID_DEFINED;
if (nextnot) {
neg ^= MBO_FSID_DEFINED;
nextnot = 0;
}
current += 2;
} else if (strcmp(argv[current], "suid") == 0) {
flags |= MBO_SUID;
if (nextnot) {
neg ^= MBO_SUID;
nextnot = 0;
}
current += 1;
} else if (strcmp(argv[current], "sgid") == 0) {
flags |= MBO_SGID;
if (nextnot) {
neg ^= MBO_SGID;
nextnot = 0;
}
current += 1;
} else if (strcmp(argv[current], "uid_of_subject") == 0) {
flags |= MBO_UID_SUBJECT;
if (nextnot) {
neg ^= MBO_UID_SUBJECT;
nextnot = 0;
}
current += 1;
} else if (strcmp(argv[current], "gid_of_subject") == 0) {
flags |= MBO_GID_SUBJECT;
if (nextnot) {
neg ^= MBO_GID_SUBJECT;
nextnot = 0;
}
current += 1;
} else if (strcmp(argv[current], "type") == 0) {
if (current + 2 > argc) {
snprintf(errstr, buflen, "type short");
return (-1);
}
if (flags & MBO_TYPE_DEFINED) {
snprintf(errstr, buflen, "one type only");
return (-1);
}
if (bsde_parse_type(argv[current+1], &type,
buflen, errstr) < 0)
return (-1);
flags |= MBO_TYPE_DEFINED;
if (nextnot) {
neg ^= MBO_TYPE_DEFINED;
nextnot = 0;
}
current += 2;
} else if (strcmp(argv[current], "!") == 0) {
if (nextnot) {
snprintf(errstr, buflen,
"double negative'");
return (-1);
}
nextnot = 1;
current += 1;
} else {
snprintf(errstr, buflen, "'%s' not expected",
argv[current]);
return (-1);
}
}
object->mbo_flags = flags;
if (not_seen)
object->mbo_neg = MBO_ALL_FLAGS ^ neg;
else
object->mbo_neg = neg;
if (flags & MBO_UID_DEFINED) {
object->mbo_uid_min = uid_min;
object->mbo_uid_max = uid_max;
}
if (flags & MBO_GID_DEFINED) {
object->mbo_gid_min = gid_min;
object->mbo_gid_max = gid_max;
}
if (flags & MBO_FSID_DEFINED)
object->mbo_fsid = fsid;
if (flags & MBO_TYPE_DEFINED)
object->mbo_type = type;
return (0);
}
int
bsde_parse_mode(int argc, char *argv[], mode_t *mode, size_t buflen,
char *errstr)
{
int i;
if (argc == 0) {
snprintf(errstr, buflen, "mode expects mode value");
return (-1);
}
if (argc != 1) {
snprintf(errstr, buflen, "'%s' unexpected", argv[1]);
return (-1);
}
*mode = 0;
for (i = 0; i < strlen(argv[0]); i++) {
switch (argv[0][i]) {
case 'a':
*mode |= MBI_ADMIN;
break;
case 'r':
*mode |= MBI_READ;
break;
case 's':
*mode |= MBI_STAT;
break;
case 'w':
*mode |= MBI_WRITE;
break;
case 'x':
*mode |= MBI_EXEC;
break;
case 'n':
/* ignore */
break;
default:
snprintf(errstr, buflen, "Unknown mode letter: %c",
argv[0][i]);
return (-1);
}
}
return (0);
}
int
bsde_parse_rule(int argc, char *argv[], struct mac_bsdextended_rule *rule,
size_t buflen, char *errstr)
{
int subject, subject_elements, subject_elements_length;
int object, object_elements, object_elements_length;
int mode, mode_elements, mode_elements_length;
int error, i;
bzero(rule, sizeof(*rule));
if (argc < 1) {
snprintf(errstr, buflen, "Rule must begin with subject");
return (-1);
}
if (strcmp(argv[0], "subject") != 0) {
snprintf(errstr, buflen, "Rule must begin with subject");
return (-1);
}
subject = 0;
subject_elements = 1;
/* Search forward for object. */
object = -1;
for (i = 1; i < argc; i++)
if (strcmp(argv[i], "object") == 0)
object = i;
if (object == -1) {
snprintf(errstr, buflen, "Rule must contain an object");
return (-1);
}
/* Search forward for mode. */
mode = -1;
for (i = object; i < argc; i++)
if (strcmp(argv[i], "mode") == 0)
mode = i;
if (mode == -1) {
snprintf(errstr, buflen, "Rule must contain mode");
return (-1);
}
subject_elements_length = object - subject - 1;
object_elements = object + 1;
object_elements_length = mode - object_elements;
mode_elements = mode + 1;
mode_elements_length = argc - mode_elements;
error = bsde_parse_subject(subject_elements_length,
argv + subject_elements, &rule->mbr_subject, buflen, errstr);
if (error)
return (-1);
error = bsde_parse_object(object_elements_length,
argv + object_elements, &rule->mbr_object, buflen, errstr);
if (error)
return (-1);
error = bsde_parse_mode(mode_elements_length, argv + mode_elements,
&rule->mbr_mode, buflen, errstr);
if (error)
return (-1);
return (0);
}
int
bsde_parse_rule_string(const char *string, struct mac_bsdextended_rule *rule,
size_t buflen, char *errstr)
{
char *stringdup, *stringp, *argv[100], **ap;
int argc, error;
stringp = stringdup = strdup(string);
while (*stringp == ' ' || *stringp == '\t')
stringp++;
argc = 0;
for (ap = argv; (*ap = strsep(&stringp, " \t")) != NULL;) {
argc++;
if (**ap != '\0')
if (++ap >= &argv[100])
break;
}
error = bsde_parse_rule(argc, argv, rule, buflen, errstr);
free(stringdup);
return (error);
}
int
bsde_get_mib(const char *string, int *name, size_t *namelen)
{
size_t len;
int error;
len = *namelen;
error = sysctlnametomib(string, name, &len);
if (error)
return (error);
*namelen = len;
return (0);
}
static int
bsde_check_version(size_t buflen, char *errstr)
{
size_t len;
int error;
int version;
len = sizeof(version);
error = sysctlbyname(MIB ".rule_version", &version, &len, NULL, 0);
if (error) {
snprintf(errstr, buflen, "version check failed: %s",
strerror(errno));
return (-1);
}
if (version != MB_VERSION) {
snprintf(errstr, buflen, "module v%d != library v%d",
version, MB_VERSION);
return (-1);
}
return (0);
}
int
bsde_get_rule_count(size_t buflen, char *errstr)
{
size_t len;
int error;
int rule_count;
len = sizeof(rule_count);
error = sysctlbyname(MIB ".rule_count", &rule_count, &len, NULL, 0);
if (error) {
snprintf(errstr, buflen, "%s", strerror(errno));
return (-1);
}
if (len != sizeof(rule_count)) {
snprintf(errstr, buflen, "Data error in %s.rule_count",
MIB);
return (-1);
}
return (rule_count);
}
int
bsde_get_rule_slots(size_t buflen, char *errstr)
{
size_t len;
int error;
int rule_slots;
len = sizeof(rule_slots);
error = sysctlbyname(MIB ".rule_slots", &rule_slots, &len, NULL, 0);
if (error) {
snprintf(errstr, buflen, "%s", strerror(errno));
return (-1);
}
if (len != sizeof(rule_slots)) {
snprintf(errstr, buflen, "Data error in %s.rule_slots", MIB);
return (-1);
}
return (rule_slots);
}
/*
* Returns 0 for success;
* Returns -1 for failure;
* Returns -2 for not present
*/
int
bsde_get_rule(int rulenum, struct mac_bsdextended_rule *rule, size_t errlen,
char *errstr)
{
int name[10];
size_t len, size;
int error;
if (bsde_check_version(errlen, errstr) != 0)
return (-1);
len = 10;
error = bsde_get_mib(MIB ".rules", name, &len);
if (error) {
snprintf(errstr, errlen, "%s: %s", MIB ".rules",
strerror(errno));
return (-1);
}
size = sizeof(*rule);
name[len] = rulenum;
len++;
error = sysctl(name, len, rule, &size, NULL, 0);
if (error == -1 && errno == ENOENT)
return (-2);
if (error) {
snprintf(errstr, errlen, "%s.%d: %s", MIB ".rules",
rulenum, strerror(errno));
return (-1);
} else if (size != sizeof(*rule)) {
snprintf(errstr, errlen, "Data error in %s.%d: %s",
MIB ".rules", rulenum, strerror(errno));
return (-1);
}
return (0);
}
int
bsde_delete_rule(int rulenum, size_t buflen, char *errstr)
{
struct mac_bsdextended_rule rule;
int name[10];
size_t len;
int error;
if (bsde_check_version(buflen, errstr) != 0)
return (-1);
len = 10;
error = bsde_get_mib(MIB ".rules", name, &len);
if (error) {
snprintf(errstr, buflen, "%s: %s", MIB ".rules",
strerror(errno));
return (-1);
}
name[len] = rulenum;
len++;
error = sysctl(name, len, NULL, NULL, &rule, 0);
if (error) {
snprintf(errstr, buflen, "%s.%d: %s", MIB ".rules",
rulenum, strerror(errno));
return (-1);
}
return (0);
}
int
bsde_set_rule(int rulenum, struct mac_bsdextended_rule *rule, size_t buflen,
char *errstr)
{
int name[10];
size_t len;
int error;
if (bsde_check_version(buflen, errstr) != 0)
return (-1);
len = 10;
error = bsde_get_mib(MIB ".rules", name, &len);
if (error) {
snprintf(errstr, buflen, "%s: %s", MIB ".rules",
strerror(errno));
return (-1);
}
name[len] = rulenum;
len++;
error = sysctl(name, len, NULL, NULL, rule, sizeof(*rule));
if (error) {
snprintf(errstr, buflen, "%s.%d: %s", MIB ".rules",
rulenum, strerror(errno));
return (-1);
}
return (0);
}
int
bsde_add_rule(int *rulenum, struct mac_bsdextended_rule *rule, size_t buflen,
char *errstr)
{
char charstr[BUFSIZ];
int name[10];
size_t len;
int error, rule_slots;
if (bsde_check_version(buflen, errstr) != 0)
return (-1);
len = 10;
error = bsde_get_mib(MIB ".rules", name, &len);
if (error) {
snprintf(errstr, buflen, "%s: %s", MIB ".rules",
strerror(errno));
return (-1);
}
rule_slots = bsde_get_rule_slots(BUFSIZ, charstr);
if (rule_slots == -1) {
snprintf(errstr, buflen, "unable to get rule slots: %s",
strerror(errno));
return (-1);
}
name[len] = rule_slots;
len++;
error = sysctl(name, len, NULL, NULL, rule, sizeof(*rule));
if (error) {
snprintf(errstr, buflen, "%s.%d: %s", MIB ".rules",
rule_slots, strerror(errno));
return (-1);
}
if (rulenum != NULL)
*rulenum = rule_slots;
return (0);
}
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