RetroZilla/security/nss/lib/certdb/xbsconst.c
2018-05-19 22:01:21 +08:00

146 lines
4.1 KiB
C

/* 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;
PLArenaPool *our_pool;
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;
our_pool = PORT_NewArena (SEC_ASN1_DEFAULT_ARENA_SIZE);
if (our_pool == NULL) {
PORT_SetError (SEC_ERROR_NO_MEMORY);
GEN_BREAK (SECFailure);
}
rv = SEC_QuickDERDecodeItem
(our_pool, &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 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_FreeArena (our_pool, PR_FALSE);
return (rv);
}