xbsconst.c
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上传日期:2007-01-12
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文件大小:5k
- /*
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the Netscape security libraries.
- *
- * The Initial Developer of the Original Code is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1994-2000 Netscape Communications Corporation. All
- * Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- */
- /*
- * X.509 v3 Basic Constraints Extension
- */
- #include "prtypes.h"
- #include "mcom_db.h"
- #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;
- PRArenaPool *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
- (PRArenaPool *arena, CERTBasicConstraints *value, SECItem *encodedValue)
- {
- EncodedContext encodeContext;
- PRArenaPool *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, SECItem *encodedValue)
- {
- EncodedContext decodeContext;
- PRArenaPool *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_ASN1DecodeItem
- (our_pool, &decodeContext, CERTBasicConstraintsTemplate, encodedValue);
- if (rv == SECFailure)
- break;
-
- value->isCA = (PRBool)(*decodeContext.isCA.data);
- 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)
- value->pathLenConstraint = DER_GetUInteger (&decodeContext.pathLenConstraint);
- 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);
- }