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a50730587b
freebsd/lib/libugidfw/ugidfw.c
Bryan Drewery 66157b3899 Fix 'ugidfw remove' after r284251 incorrectly changed it. 
The sysctl_rule() node removes entries when given a newptr and newlen == 0.
2015-09-29 18:48:12 +00:00

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/*-
* 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;
size_t len;
spec2 = spec;
spec1 = strsep(&spec2, ":");
pwd = getpwnam(spec1);
if (pwd != NULL)
uid1 = pwd->pw_uid;
else {
value = strtoul(spec1, &endp, 10);
if (*endp != '\0') {
len = 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') {
len = 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;
size_t len;
spec2 = spec;
spec1 = strsep(&spec2, ":");
grp = getgrnam(spec1);
if (grp != NULL)
gid1 = grp->gr_gid;
else {
value = strtoul(spec1, &endp, 10);
if (*endp != '\0') {
len = 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') {
len = 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;
size_t len;
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) {
len = snprintf(errstr, buflen, "uid short");
return (-1);
}
if (flags & MBS_UID_DEFINED) {
len = 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) {
len = snprintf(errstr, buflen, "gid short");
return (-1);
}
if (flags & MBS_GID_DEFINED) {
len = 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) {
len = snprintf(errstr, buflen, "prison short");
return (-1);
}
if (flags & MBS_PRISON_DEFINED) {
len = snprintf(errstr, buflen, "one jail only");
return (-1);
}
value = strtol(argv[current+1], &endp, 10);
if (*endp != '\0') {
len = 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) {
len = snprintf(errstr, buflen,
"double negative");
return (-1);
}
nextnot = 1;
current += 1;
} else {
len = 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)
{
size_t len;
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:
len = 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)
{
size_t len;
struct statfs buf;
if (statfs(spec, &buf) < 0) {
len = 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;
size_t len;
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) {
len = snprintf(errstr, buflen, "uid short");
return (-1);
}
if (flags & MBO_UID_DEFINED) {
len = 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) {
len = snprintf(errstr, buflen, "gid short");
return (-1);
}
if (flags & MBO_GID_DEFINED) {
len = 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) {
len = snprintf(errstr, buflen, "filesys short");
return (-1);
}
if (flags & MBO_FSID_DEFINED) {
len = 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) {
len = snprintf(errstr, buflen, "type short");
return (-1);
}
if (flags & MBO_TYPE_DEFINED) {
len = 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) {
len = snprintf(errstr, buflen,
"double negative'");
return (-1);
}
nextnot = 1;
current += 1;
} else {
len = 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)
{
size_t len;
int i;
if (argc == 0) {
len = snprintf(errstr, buflen, "mode expects mode value");
return (-1);
}
if (argc != 1) {
len = 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:
len = 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;
size_t len;
bzero(rule, sizeof(*rule));
if (argc < 1) {
len = snprintf(errstr, buflen, "Rule must begin with subject");
return (-1);
}
if (strcmp(argv[0], "subject") != 0) {
len = 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) {
len = 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) {
len = 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) {
len = snprintf(errstr, buflen, "version check failed: %s",
strerror(errno));
return (-1);
}
if (version != MB_VERSION) {
len = 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) {
len = snprintf(errstr, buflen, "%s", strerror(errno));
return (-1);
}
if (len != sizeof(rule_count)) {
len = 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) {
len = snprintf(errstr, buflen, "%s", strerror(errno));
return (-1);
}
if (len != sizeof(rule_slots)) {
len = 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) {
len = 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) {
len = snprintf(errstr, errlen, "%s.%d: %s", MIB ".rules",
rulenum, strerror(errno));
return (-1);
} else if (size != sizeof(*rule)) {
len = 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) {
len = 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) {
len = 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) {
len = 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) {
len = 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) {
len = snprintf(errstr, buflen, "%s: %s", MIB ".rules",
strerror(errno));
return (-1);
}
rule_slots = bsde_get_rule_slots(BUFSIZ, charstr);
if (rule_slots == -1) {
len = 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) {
len = 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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