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pjs/security/nss/lib/softoken/lowcert.c

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* 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 the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Dr Vipul Gupta <vipul.gupta@sun.com>, Sun Microsystems Laboratories
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Certificate handling code
*
* $Id: lowcert.c,v 1.18 2004-04-25 15:03:16 gerv%gerv.net Exp $
*/
#include "seccomon.h"
#include "secder.h"
#include "nssilock.h"
#include "prmon.h"
#include "prtime.h"
#include "lowkeyi.h"
#include "pcert.h"
#include "secasn1.h"
#include "secoid.h"
#ifdef NSS_ENABLE_ECC
extern SECStatus EC_FillParams(PRArenaPool *arena,
const SECItem *encodedParams,
ECParams *params);
#endif
static const SEC_ASN1Template nsslowcert_SubjectPublicKeyInfoTemplate[] = {
{ SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSLOWCERTSubjectPublicKeyInfo) },
{ SEC_ASN1_INLINE, offsetof(NSSLOWCERTSubjectPublicKeyInfo,algorithm),
SECOID_AlgorithmIDTemplate },
{ SEC_ASN1_BIT_STRING,
offsetof(NSSLOWCERTSubjectPublicKeyInfo,subjectPublicKey), },
{ 0, }
};
static const SEC_ASN1Template nsslowcert_RSAPublicKeyTemplate[] = {
{ SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSLOWKEYPublicKey) },
{ SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPublicKey,u.rsa.modulus), },
{ SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPublicKey,u.rsa.publicExponent), },
{ 0, }
};
static const SEC_ASN1Template nsslowcert_DSAPublicKeyTemplate[] = {
{ SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPublicKey,u.dsa.publicValue), },
{ 0, }
};
static const SEC_ASN1Template nsslowcert_DHPublicKeyTemplate[] = {
{ SEC_ASN1_INTEGER, offsetof(NSSLOWKEYPublicKey,u.dh.publicValue), },
{ 0, }
};
/*
* See bugzilla bug 125359
* Since NSS (via PKCS#11) wants to handle big integers as unsigned ints,
* all of the templates above that en/decode into integers must be converted
* from ASN.1's signed integer type. This is done by marking either the
* source or destination (encoding or decoding, respectively) type as
* siUnsignedInteger.
*/
static void
prepare_low_rsa_pub_key_for_asn1(NSSLOWKEYPublicKey *pubk)
{
pubk->u.rsa.modulus.type = siUnsignedInteger;
pubk->u.rsa.publicExponent.type = siUnsignedInteger;
}
static void
prepare_low_dsa_pub_key_for_asn1(NSSLOWKEYPublicKey *pubk)
{
pubk->u.dsa.publicValue.type = siUnsignedInteger;
pubk->u.dsa.params.prime.type = siUnsignedInteger;
pubk->u.dsa.params.subPrime.type = siUnsignedInteger;
pubk->u.dsa.params.base.type = siUnsignedInteger;
}
static void
prepare_low_dh_pub_key_for_asn1(NSSLOWKEYPublicKey *pubk)
{
pubk->u.dh.prime.type = siUnsignedInteger;
pubk->u.dh.base.type = siUnsignedInteger;
pubk->u.dh.publicValue.type = siUnsignedInteger;
}
/*
* Allow use of default cert database, so that apps(such as mozilla) don't
* have to pass the handle all over the place.
*/
static NSSLOWCERTCertDBHandle *default_pcert_db_handle = 0;
void
nsslowcert_SetDefaultCertDB(NSSLOWCERTCertDBHandle *handle)
{
default_pcert_db_handle = handle;
return;
}
NSSLOWCERTCertDBHandle *
nsslowcert_GetDefaultCertDB(void)
{
return(default_pcert_db_handle);
}
/*
* simple cert decoder to avoid the cost of asn1 engine
*/
static unsigned char *
nsslowcert_dataStart(unsigned char *buf, unsigned int length,
unsigned int *data_length, PRBool includeTag,
unsigned char* rettag) {
unsigned char tag;
unsigned int used_length= 0;
tag = buf[used_length++];
if (rettag) {
*rettag = tag;
}
/* blow out when we come to the end */
if (tag == 0) {
return NULL;
}
*data_length = buf[used_length++];
if (*data_length&0x80) {
int len_count = *data_length & 0x7f;
*data_length = 0;
while (len_count-- > 0) {
*data_length = (*data_length << 8) | buf[used_length++];
}
}
if (*data_length > (length-used_length) ) {
*data_length = length-used_length;
return NULL;
}
if (includeTag) *data_length += used_length;
return (buf + (includeTag ? 0 : used_length));
}
static void SetTimeType(SECItem* item, unsigned char tagtype)
{
switch (tagtype) {
case SEC_ASN1_UTC_TIME:
item->type = siUTCTime;
break;
case SEC_ASN1_GENERALIZED_TIME:
item->type = siGeneralizedTime;
break;
default:
PORT_Assert(0);
break;
}
}
static int
nsslowcert_GetValidityFields(unsigned char *buf,int buf_length,
SECItem *notBefore, SECItem *notAfter)
{
unsigned char tagtype;
notBefore->data = nsslowcert_dataStart(buf,buf_length,
&notBefore->len,PR_FALSE, &tagtype);
if (notBefore->data == NULL) return SECFailure;
SetTimeType(notBefore, tagtype);
buf_length -= (notBefore->data-buf) + notBefore->len;
buf = notBefore->data + notBefore->len;
notAfter->data = nsslowcert_dataStart(buf,buf_length,
&notAfter->len,PR_FALSE, &tagtype);
if (notAfter->data == NULL) return SECFailure;
SetTimeType(notAfter, tagtype);
return SECSuccess;
}
static int
nsslowcert_GetCertFields(unsigned char *cert,int cert_length,
SECItem *issuer, SECItem *serial, SECItem *derSN, SECItem *subject,
SECItem *valid, SECItem *subjkey)
{
unsigned char *buf;
unsigned int buf_length;
unsigned char *dummy;
unsigned int dummylen;
/* get past the signature wrap */
buf = nsslowcert_dataStart(cert,cert_length,&buf_length,PR_FALSE, NULL);
if (buf == NULL) return SECFailure;
/* get into the raw cert data */
buf = nsslowcert_dataStart(buf,buf_length,&buf_length,PR_FALSE, NULL);
if (buf == NULL) return SECFailure;
/* skip past any optional version number */
if ((buf[0] & 0xa0) == 0xa0) {
dummy = nsslowcert_dataStart(buf,buf_length,&dummylen,PR_FALSE, NULL);
if (dummy == NULL) return SECFailure;
buf_length -= (dummy-buf) + dummylen;
buf = dummy + dummylen;
}
/* serial number */
if (derSN) {
derSN->data=nsslowcert_dataStart(buf,buf_length,&derSN->len,PR_TRUE, NULL);
}
serial->data = nsslowcert_dataStart(buf,buf_length,&serial->len,PR_FALSE, NULL);
if (serial->data == NULL) return SECFailure;
buf_length -= (serial->data-buf) + serial->len;
buf = serial->data + serial->len;
/* skip the OID */
dummy = nsslowcert_dataStart(buf,buf_length,&dummylen,PR_FALSE, NULL);
if (dummy == NULL) return SECFailure;
buf_length -= (dummy-buf) + dummylen;
buf = dummy + dummylen;
/* issuer */
issuer->data = nsslowcert_dataStart(buf,buf_length,&issuer->len,PR_TRUE, NULL);
if (issuer->data == NULL) return SECFailure;
buf_length -= (issuer->data-buf) + issuer->len;
buf = issuer->data + issuer->len;
/* only wanted issuer/SN */
if (valid == NULL) {
return SECSuccess;
}
/* validity */
valid->data = nsslowcert_dataStart(buf,buf_length,&valid->len,PR_FALSE, NULL);
if (valid->data == NULL) return SECFailure;
buf_length -= (valid->data-buf) + valid->len;
buf = valid->data + valid->len;
/*subject */
subject->data=nsslowcert_dataStart(buf,buf_length,&subject->len,PR_TRUE, NULL);
if (subject->data == NULL) return SECFailure;
buf_length -= (subject->data-buf) + subject->len;
buf = subject->data + subject->len;
/* subject key info */
subjkey->data=nsslowcert_dataStart(buf,buf_length,&subjkey->len,PR_TRUE, NULL);
if (subjkey->data == NULL) return SECFailure;
buf_length -= (subjkey->data-buf) + subjkey->len;
buf = subjkey->data + subjkey->len;
return SECSuccess;
}
SECStatus
nsslowcert_GetCertTimes(NSSLOWCERTCertificate *c, PRTime *notBefore, PRTime *notAfter)
{
int rv;
NSSLOWCERTValidity validity;
rv = nsslowcert_GetValidityFields(c->validity.data,c->validity.len,
&validity.notBefore,&validity.notAfter);
if (rv != SECSuccess) {
return rv;
}
/* convert DER not-before time */
rv = DER_DecodeTimeChoice(notBefore, &validity.notBefore);
if (rv) {
return(SECFailure);
}
/* convert DER not-after time */
rv = DER_DecodeTimeChoice(notAfter, &validity.notAfter);
if (rv) {
return(SECFailure);
}
return(SECSuccess);
}
/*
* is certa newer than certb? If one is expired, pick the other one.
*/
PRBool
nsslowcert_IsNewer(NSSLOWCERTCertificate *certa, NSSLOWCERTCertificate *certb)
{
PRTime notBeforeA, notAfterA, notBeforeB, notAfterB, now;
SECStatus rv;
PRBool newerbefore, newerafter;
rv = nsslowcert_GetCertTimes(certa, &notBeforeA, &notAfterA);
if ( rv != SECSuccess ) {
return(PR_FALSE);
}
rv = nsslowcert_GetCertTimes(certb, &notBeforeB, &notAfterB);
if ( rv != SECSuccess ) {
return(PR_TRUE);
}
newerbefore = PR_FALSE;
if ( LL_CMP(notBeforeA, >, notBeforeB) ) {
newerbefore = PR_TRUE;
}
newerafter = PR_FALSE;
if ( LL_CMP(notAfterA, >, notAfterB) ) {
newerafter = PR_TRUE;
}
if ( newerbefore && newerafter ) {
return(PR_TRUE);
}
if ( ( !newerbefore ) && ( !newerafter ) ) {
return(PR_FALSE);
}
/* get current time */
now = PR_Now();
if ( newerbefore ) {
/* cert A was issued after cert B, but expires sooner */
/* if A is expired, then pick B */
if ( LL_CMP(notAfterA, <, now ) ) {
return(PR_FALSE);
}
return(PR_TRUE);
} else {
/* cert B was issued after cert A, but expires sooner */
/* if B is expired, then pick A */
if ( LL_CMP(notAfterB, <, now ) ) {
return(PR_TRUE);
}
return(PR_FALSE);
}
}
#define SOFT_DEFAULT_CHUNKSIZE 2048
static SECStatus
nsslowcert_KeyFromIssuerAndSN(PRArenaPool *arena, SECItem *issuer, SECItem *sn,
SECItem *key)
{
unsigned int len = sn->len + issuer->len;
if (arena) {
key->data = (unsigned char*)PORT_ArenaAlloc(arena, len);
} else {
if (len > key->len) {
key->data = (unsigned char*)PORT_ArenaAlloc(arena, len);
}
}
if ( !key->data ) {
goto loser;
}
key->len = len;
/* copy the serialNumber */
PORT_Memcpy(key->data, sn->data, sn->len);
/* copy the issuer */
PORT_Memcpy(&key->data[sn->len], issuer->data, issuer->len);
return(SECSuccess);
loser:
return(SECFailure);
}
/*
* take a DER certificate and decode it into a certificate structure
*/
NSSLOWCERTCertificate *
nsslowcert_DecodeDERCertificate(SECItem *derSignedCert, char *nickname)
{
NSSLOWCERTCertificate *cert;
int rv;
/* allocate the certificate structure */
cert = nsslowcert_CreateCert();
if ( !cert ) {
goto loser;
}
/* point to passed in DER data */
cert->derCert = *derSignedCert;
cert->nickname = NULL;
cert->certKey.data = NULL;
cert->referenceCount = 1;
/* decode the certificate info */
rv = nsslowcert_GetCertFields(cert->derCert.data, cert->derCert.len,
&cert->derIssuer, &cert->serialNumber, &cert->derSN, &cert->derSubject,
&cert->validity, &cert->derSubjKeyInfo);
/* cert->subjectKeyID; x509v3 subject key identifier */
cert->subjectKeyID.data = NULL;
cert->subjectKeyID.len = 0;
cert->dbEntry = NULL;
cert ->trust = NULL;
/* generate and save the database key for the cert */
cert->certKey.data = cert->certKeySpace;
cert->certKey.len = sizeof(cert->certKeySpace);
rv = nsslowcert_KeyFromIssuerAndSN(NULL, &cert->derIssuer,
&cert->serialNumber, &cert->certKey);
if ( rv ) {
goto loser;
}
/* set the nickname */
if ( nickname == NULL ) {
cert->nickname = NULL;
} else {
/* copy and install the nickname */
cert->nickname = pkcs11_copyNickname(nickname,cert->nicknameSpace,
sizeof(cert->nicknameSpace));
}
#ifdef FIXME
/* initialize the subjectKeyID */
rv = cert_GetKeyID(cert);
if ( rv != SECSuccess ) {
goto loser;
}
/* set the email address */
cert->emailAddr = CERT_GetCertificateEmailAddress(cert);
#endif
cert->referenceCount = 1;
return(cert);
loser:
if (cert) {
nsslowcert_DestroyCertificate(cert);
}
return(0);
}
char *
nsslowcert_FixupEmailAddr(char *emailAddr)
{
char *retaddr;
char *str;
if ( emailAddr == NULL ) {
return(NULL);
}
/* copy the string */
str = retaddr = PORT_Strdup(emailAddr);
if ( str == NULL ) {
return(NULL);
}
/* make it lower case */
while ( *str ) {
*str = tolower( *str );
str++;
}
return(retaddr);
}
/*
* Generate a database key, based on serial number and issuer, from a
* DER certificate.
*/
SECStatus
nsslowcert_KeyFromDERCert(PRArenaPool *arena, SECItem *derCert, SECItem *key)
{
int rv;
NSSLOWCERTCertKey certkey;
PORT_Memset(&certkey, 0, sizeof(NSSLOWCERTCertKey));
rv = nsslowcert_GetCertFields(derCert->data, derCert->len,
&certkey.derIssuer, &certkey.serialNumber, NULL, NULL, NULL, NULL);
if ( rv ) {
goto loser;
}
return(nsslowcert_KeyFromIssuerAndSN(arena, &certkey.derIssuer,
&certkey.serialNumber, key));
loser:
return(SECFailure);
}
NSSLOWKEYPublicKey *
nsslowcert_ExtractPublicKey(NSSLOWCERTCertificate *cert)
{
NSSLOWCERTSubjectPublicKeyInfo spki;
NSSLOWKEYPublicKey *pubk;
SECItem os;
SECStatus rv;
PRArenaPool *arena;
SECOidTag tag;
SECItem newDerSubjKeyInfo;
arena = PORT_NewArena (DER_DEFAULT_CHUNKSIZE);
if (arena == NULL)
return NULL;
pubk = (NSSLOWKEYPublicKey *)
PORT_ArenaZAlloc(arena, sizeof(NSSLOWKEYPublicKey));
if (pubk == NULL) {
PORT_FreeArena (arena, PR_FALSE);
return NULL;
}
pubk->arena = arena;
PORT_Memset(&spki,0,sizeof(spki));
/* copy the DER into the arena, since Quick DER returns data that points
into the DER input, which may get freed by the caller */
rv = SECITEM_CopyItem(arena, &newDerSubjKeyInfo, &cert->derSubjKeyInfo);
if ( rv != SECSuccess ) {
PORT_FreeArena (arena, PR_FALSE);
return NULL;
}
/* we haven't bothered decoding the spki struct yet, do it now */
rv = SEC_QuickDERDecodeItem(arena, &spki,
nsslowcert_SubjectPublicKeyInfoTemplate, &newDerSubjKeyInfo);
if (rv != SECSuccess) {
PORT_FreeArena (arena, PR_FALSE);
return NULL;
}
/* Convert bit string length from bits to bytes */
os = spki.subjectPublicKey;
DER_ConvertBitString (&os);
tag = SECOID_GetAlgorithmTag(&spki.algorithm);
switch ( tag ) {
case SEC_OID_X500_RSA_ENCRYPTION:
case SEC_OID_PKCS1_RSA_ENCRYPTION:
pubk->keyType = NSSLOWKEYRSAKey;
prepare_low_rsa_pub_key_for_asn1(pubk);
rv = SEC_QuickDERDecodeItem(arena, pubk,
nsslowcert_RSAPublicKeyTemplate, &os);
if (rv == SECSuccess)
return pubk;
break;
case SEC_OID_ANSIX9_DSA_SIGNATURE:
pubk->keyType = NSSLOWKEYDSAKey;
prepare_low_dsa_pub_key_for_asn1(pubk);
rv = SEC_QuickDERDecodeItem(arena, pubk,
nsslowcert_DSAPublicKeyTemplate, &os);
if (rv == SECSuccess) return pubk;
break;
case SEC_OID_X942_DIFFIE_HELMAN_KEY:
pubk->keyType = NSSLOWKEYDHKey;
prepare_low_dh_pub_key_for_asn1(pubk);
rv = SEC_QuickDERDecodeItem(arena, pubk,
nsslowcert_DHPublicKeyTemplate, &os);
if (rv == SECSuccess) return pubk;
break;
#ifdef NSS_ENABLE_ECC
case SEC_OID_ANSIX962_EC_PUBLIC_KEY:
pubk->keyType = NSSLOWKEYECKey;
/* Since PKCS#11 directly takes the DER encoding of EC params
* and public value, we don't need any decoding here.
*/
rv = SECITEM_CopyItem(arena, &pubk->u.ec.ecParams.DEREncoding,
&spki.algorithm.parameters);
if ( rv != SECSuccess )
break;
/* Fill out the rest of the ecParams structure
* based on the encoded params
*/
if (EC_FillParams(arena, &pubk->u.ec.ecParams.DEREncoding,
&pubk->u.ec.ecParams) != SECSuccess)
break;
rv = SECITEM_CopyItem(arena, &pubk->u.ec.publicValue, &os);
if (rv == SECSuccess) return pubk;
break;
#endif /* NSS_ENABLE_ECC */
default:
rv = SECFailure;
break;
}
nsslowkey_DestroyPublicKey (pubk);
return NULL;
}
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