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/* $OpenBSD: as.c,v 1.17 2024/11/12 09:23:07 tb Exp $ */
/*
* Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
/* Parse a uint32_t AS identifier from an ASN1_INTEGER. */
int
as_id_parse(const ASN1_INTEGER *v, uint32_t *out)
{
uint64_t res = 0;
if (!ASN1_INTEGER_get_uint64(&res, v))
return 0;
if (res > UINT32_MAX)
return 0;
*out = res;
return 1;
}
/*
* Given a newly-parsed AS number or range "as", make sure that "as" does
* not overlap with any other numbers or ranges in the "ases" array.
* This is defined by RFC 3779 section 3.2.3.4.
* Returns zero on failure, non-zero on success.
*/
int
as_check_overlap(const struct cert_as *as, const char *fn,
const struct cert_as *ases, size_t num_ases, int quiet)
{
size_t i;
/* We can have only one inheritance statement. */
if (num_ases &&
(as->type == CERT_AS_INHERIT || ases[0].type == CERT_AS_INHERIT)) {
if (!quiet) {
warnx("%s: RFC 3779 section 3.2.3.3: "
"cannot have inheritance and multiple ASnum or "
"multiple inheritance", fn);
}
return 0;
}
/* Now check for overlaps between singletons/ranges. */
for (i = 0; i < num_ases; i++) {
switch (ases[i].type) {
case CERT_AS_ID:
switch (as->type) {
case CERT_AS_ID:
if (as->id != ases[i].id)
continue;
break;
case CERT_AS_RANGE:
if (ases->range.min > ases[i].id ||
ases->range.max < ases[i].id)
continue;
break;
default:
abort();
}
break;
case CERT_AS_RANGE:
switch (as->type) {
case CERT_AS_ID:
if (ases[i].range.min > as->id ||
ases[i].range.max < as->id)
continue;
break;
case CERT_AS_RANGE:
if (as->range.max < ases[i].range.min ||
as->range.min > ases[i].range.max)
continue;
break;
default:
abort();
}
break;
default:
abort();
}
if (!quiet) {
warnx("%s: RFC 3779 section 3.2.3.4: "
"cannot have overlapping ASnum", fn);
}
return 0;
}
return 1;
}
/*
* See if a given AS range (which may be the same number, in the case of
* singleton AS identifiers) is covered by the AS numbers or ranges
* specified in the "ases" array.
* Return <0 if there is no cover, 0 if we're inheriting, >0 if there is.
*/
int
as_check_covered(uint32_t min, uint32_t max,
const struct cert_as *ases, size_t num_ases)
{
size_t i;
uint32_t amin, amax;
for (i = 0; i < num_ases; i++) {
if (ases[i].type == CERT_AS_INHERIT)
return 0;
amin = ases[i].type == CERT_AS_RANGE ?
ases[i].range.min : ases[i].id;
amax = ases[i].type == CERT_AS_RANGE ?
ases[i].range.max : ases[i].id;
if (min >= amin && max <= amax)
return 1;
}
return -1;
}
void
as_warn(const char *fn, const char *msg, const struct cert_as *as)
{
switch (as->type) {
case CERT_AS_ID:
warnx("%s: %s: AS %u", fn, msg, as->id);
break;
case CERT_AS_RANGE:
warnx("%s: %s: AS range %u--%u", fn, msg, as->range.min,
as->range.max);
break;
case CERT_AS_INHERIT:
warnx("%s: %s: AS (inherit)", fn, msg);
break;
default:
warnx("%s: corrupt cert", fn);
break;
}
}
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