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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* X.509 v3 Basic Constraints Extension
*/
#include "prtypes.h"
#include <limits.h> /* for LONG_MAX */
#include "seccomon.h"
#include "secdert.h"
#include "secoidt.h"
#include "secasn1t.h"
#include "secasn1.h"
#include "certt.h"
#include "secder.h"
#include "prprf.h"
#include "secerr.h"
typedef struct EncodedContext {
SECItem isCA;
SECItem pathLenConstraint;
SECItem encodedValue;
PLArenaPool *arena;
} EncodedContext;
static const SEC_ASN1Template CERTBasicConstraintsTemplate[] = {
{ SEC_ASN1_SEQUENCE, 0, NULL, sizeof(EncodedContext) },
{ SEC_ASN1_OPTIONAL | SEC_ASN1_BOOLEAN, /* XXX DER_DEFAULT */
offsetof(EncodedContext, isCA) },
{ SEC_ASN1_OPTIONAL | SEC_ASN1_INTEGER,
offsetof(EncodedContext, pathLenConstraint) },
{ 0 }
};
static unsigned char hexTrue = 0xff;
static unsigned char hexFalse = 0x00;
#define GEN_BREAK(status) \
rv = status; \
break;
SECStatus
CERT_EncodeBasicConstraintValue(PLArenaPool *arena, CERTBasicConstraints *value,
SECItem *encodedValue)
{
EncodedContext encodeContext;
PLArenaPool *our_pool = NULL;
SECStatus rv = SECSuccess;
do {
PORT_Memset(&encodeContext, 0, sizeof(encodeContext));
if (!value->isCA && value->pathLenConstraint >= 0) {
PORT_SetError(SEC_ERROR_EXTENSION_VALUE_INVALID);
GEN_BREAK(SECFailure);
}
encodeContext.arena = arena;
if (value->isCA == PR_TRUE) {
encodeContext.isCA.data = &hexTrue;
encodeContext.isCA.len = 1;
}
/* If the pathLenConstraint is less than 0, then it should be
* omitted from the encoding.
*/
if (value->isCA && value->pathLenConstraint >= 0) {
our_pool = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
if (our_pool == NULL) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
GEN_BREAK(SECFailure);
}
if (SEC_ASN1EncodeUnsignedInteger(
our_pool, &encodeContext.pathLenConstraint,
(unsigned long)value->pathLenConstraint) == NULL) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
GEN_BREAK(SECFailure);
}
}
if (SEC_ASN1EncodeItem(arena, encodedValue, &encodeContext,
CERTBasicConstraintsTemplate) == NULL) {
GEN_BREAK(SECFailure);
}
} while (0);
if (our_pool)
PORT_FreeArena(our_pool, PR_FALSE);
return (rv);
}
SECStatus
CERT_DecodeBasicConstraintValue(CERTBasicConstraints *value,
const SECItem *encodedValue)
{
EncodedContext decodeContext;
PORTCheapArenaPool tmpArena;
SECStatus rv = SECSuccess;
do {
PORT_Memset(&decodeContext, 0, sizeof(decodeContext));
/* initialize the value just in case we got "0x30 00", or when the
pathLenConstraint is omitted.
*/
decodeContext.isCA.data = &hexFalse;
decodeContext.isCA.len = 1;
PORT_InitCheapArena(&tmpArena, SEC_ASN1_DEFAULT_ARENA_SIZE);
rv = SEC_QuickDERDecodeItem(&tmpArena.arena, &decodeContext,
CERTBasicConstraintsTemplate, encodedValue);
if (rv == SECFailure)
break;
value->isCA = decodeContext.isCA.data
? (PRBool)(decodeContext.isCA.data[0] != 0)
: PR_FALSE;
if (decodeContext.pathLenConstraint.data == NULL) {
/* if the pathLenConstraint is not encoded, and the current setting
is CA, then the pathLenConstraint should be set to a negative
number
for unlimited certificate path.
*/
if (value->isCA) {
value->pathLenConstraint = CERT_UNLIMITED_PATH_CONSTRAINT;
} else {
value->pathLenConstraint = 0;
}
} else if (value->isCA) {
long len = DER_GetInteger(&decodeContext.pathLenConstraint);
if (len < 0 || len == LONG_MAX) {
PORT_SetError(SEC_ERROR_BAD_DER);
GEN_BREAK(SECFailure);
}
value->pathLenConstraint = len;
} else {
/* here we get an error where the subject is not a CA, but
the pathLenConstraint is set */
PORT_SetError(SEC_ERROR_BAD_DER);
GEN_BREAK(SECFailure);
break;
}
} while (0);
PORT_DestroyCheapArena(&tmpArena);
return (rv);
}
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