The Tor Browser: security/nss/lib/certdb/certv3.c@b8a032363ba2 (annotated)

security/nss/lib/certdb/certv3.c@b8a032363ba2 (annotated)

security/nss/lib/certdb/certv3.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* 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/. */
 /*
  * Code for dealing with X509.V3 extensions.
  */
 #include "cert.h"
 #include "secitem.h"
 #include "secoid.h"
 #include "secder.h"
 #include "secasn1.h"
 #include "certxutl.h"
 #include "secerr.h"
 SECStatus
 CERT_FindCertExtensionByOID(CERTCertificate *cert, SECItem *oid,
 			    SECItem *value)
 {
     return (cert_FindExtensionByOID (cert->extensions, oid, value));
 }
 SECStatus
 CERT_FindCertExtension(const CERTCertificate *cert, int tag, SECItem *value)
 {
     return (cert_FindExtension (cert->extensions, tag, value));
 }
 static void
 SetExts(void *object, CERTCertExtension **exts)
 {
     CERTCertificate *cert = (CERTCertificate *)object;
     cert->extensions = exts;
     DER_SetUInteger (cert->arena, &(cert->version), SEC_CERTIFICATE_VERSION_3);
 }
 void *
 CERT_StartCertExtensions(CERTCertificate *cert)
 {
     return (cert_StartExtensions ((void *)cert, cert->arena, SetExts));
 }
 /* find the given extension in the certificate of the Issuer of 'cert' */
 SECStatus
 CERT_FindIssuerCertExtension(CERTCertificate *cert, int tag, SECItem *value)
 {
     CERTCertificate *issuercert;
     SECStatus rv;
     issuercert = CERT_FindCertByName(cert->dbhandle, &cert->derIssuer);
     if ( issuercert ) {
 	rv = cert_FindExtension(issuercert->extensions, tag, value);
 	CERT_DestroyCertificate(issuercert);
     } else {
 	rv = SECFailure;
     }
     return(rv);
 }
 /* find a URL extension in the cert or its CA
  * apply the base URL string if it exists
  */
 char *
 CERT_FindCertURLExtension(CERTCertificate *cert, int tag, int catag)
 {
     SECStatus rv;
     SECItem urlitem = {siBuffer,0};
     SECItem baseitem = {siBuffer,0};
     SECItem urlstringitem = {siBuffer,0};
     SECItem basestringitem = {siBuffer,0};
     PLArenaPool *arena = NULL;
     PRBool hasbase;
     char *urlstring;
     char *str;
     int len;
     unsigned int i;
     urlstring = NULL;
     arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
     if ( ! arena ) {
 	goto loser;
     }
     hasbase = PR_FALSE;
     rv = cert_FindExtension(cert->extensions, tag, &urlitem);
     if ( rv == SECSuccess ) {
 	rv = cert_FindExtension(cert->extensions, SEC_OID_NS_CERT_EXT_BASE_URL,
 				   &baseitem);
 	if ( rv == SECSuccess ) {
 	    hasbase = PR_TRUE;
 	}
     } else if ( catag ) {
 	/* if the cert doesn't have the extensions, see if the issuer does */
 	rv = CERT_FindIssuerCertExtension(cert, catag, &urlitem);
 	if ( rv != SECSuccess ) {
 	    goto loser;
 	}
 	rv = CERT_FindIssuerCertExtension(cert, SEC_OID_NS_CERT_EXT_BASE_URL,
 					 &baseitem);
 	if ( rv == SECSuccess ) {
 	    hasbase = PR_TRUE;
 	}
     } else {
 	goto loser;
     }
     rv = SEC_QuickDERDecodeItem(arena, &urlstringitem,
                                 SEC_ASN1_GET(SEC_IA5StringTemplate), &urlitem);
     if ( rv != SECSuccess ) {
 	goto loser;
     }
     if ( hasbase ) {
 	rv = SEC_QuickDERDecodeItem(arena, &basestringitem,
                                     SEC_ASN1_GET(SEC_IA5StringTemplate),
                                     &baseitem);
 	if ( rv != SECSuccess ) {
 	    goto loser;
 	}
     }
     len = urlstringitem.len + ( hasbase ? basestringitem.len : 0 ) + 1;
     str = urlstring = (char *)PORT_Alloc(len);
     if ( urlstring == NULL ) {
 	goto loser;
     }
     /* copy the URL base first */
     if ( hasbase ) {
 	/* if the urlstring has a : in it, then we assume it is an absolute
 	 * URL, and will not get the base string pre-pended
 	 */
 	for ( i = 0; i < urlstringitem.len; i++ ) {
 	    if ( urlstringitem.data[i] == ':' ) {
 		goto nobase;
 	    }
 	}
 	PORT_Memcpy(str, basestringitem.data, basestringitem.len);
 	str += basestringitem.len;
     }
 nobase:
     /* copy the rest (or all) of the URL */
     PORT_Memcpy(str, urlstringitem.data, urlstringitem.len);
     str += urlstringitem.len;
     *str = '\0';
     goto done;
 loser:
     if ( urlstring ) {
 	PORT_Free(urlstring);
     }
     urlstring = NULL;
 done:
     if ( arena ) {
 	PORT_FreeArena(arena, PR_FALSE);
     }
     if ( baseitem.data ) {
 	PORT_Free(baseitem.data);
     }
     if ( urlitem.data ) {
 	PORT_Free(urlitem.data);
     }
     return(urlstring);
 }
 /*
  * get the value of the Netscape Certificate Type Extension
  */
 SECStatus
 CERT_FindNSCertTypeExtension(CERTCertificate *cert, SECItem *retItem)
 {
     return (CERT_FindBitStringExtension
 	    (cert->extensions, SEC_OID_NS_CERT_EXT_CERT_TYPE, retItem));
 }
 /*
  * get the value of a string type extension
  */
 char *
 CERT_FindNSStringExtension(CERTCertificate *cert, int oidtag)
 {
     SECItem wrapperItem, tmpItem = {siBuffer,0};
     SECStatus rv;
     PLArenaPool *arena = NULL;
     char *retstring = NULL;
     wrapperItem.data = NULL;
     tmpItem.data = NULL;
     arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
     if ( ! arena ) {
 	goto loser;
     }
     rv = cert_FindExtension(cert->extensions, oidtag,
 			       &wrapperItem);
     if ( rv != SECSuccess ) {
 	goto loser;
     }
     rv = SEC_QuickDERDecodeItem(arena, &tmpItem,
                             SEC_ASN1_GET(SEC_IA5StringTemplate), &wrapperItem);
     if ( rv != SECSuccess ) {
 	goto loser;
     }
     retstring = (char *)PORT_Alloc(tmpItem.len + 1 );
     if ( retstring == NULL ) {
 	goto loser;
     }
     PORT_Memcpy(retstring, tmpItem.data, tmpItem.len);
     retstring[tmpItem.len] = '\0';
 loser:
     if ( arena ) {
 	PORT_FreeArena(arena, PR_FALSE);
     }
     if ( wrapperItem.data ) {
 	PORT_Free(wrapperItem.data);
     }
     return(retstring);
 }
 /*
  * get the value of the X.509 v3 Key Usage Extension
  */
 SECStatus
 CERT_FindKeyUsageExtension(CERTCertificate *cert, SECItem *retItem)
 {
     return (CERT_FindBitStringExtension(cert->extensions,
 					SEC_OID_X509_KEY_USAGE, retItem));
 }
 /*
  * get the value of the X.509 v3 Key Usage Extension
  */
 SECStatus
 CERT_FindSubjectKeyIDExtension(CERTCertificate *cert, SECItem *retItem)
 {
     SECStatus rv;
     SECItem encodedValue = {siBuffer, NULL, 0 };
     SECItem decodedValue = {siBuffer, NULL, 0 };
     rv = cert_FindExtension
 	 (cert->extensions, SEC_OID_X509_SUBJECT_KEY_ID, &encodedValue);
     if (rv == SECSuccess) {
 	PLArenaPool * tmpArena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
 	if (tmpArena) {
 	    rv = SEC_QuickDERDecodeItem(tmpArena, &decodedValue,
 	                                SEC_ASN1_GET(SEC_OctetStringTemplate),
 					&encodedValue);
 	    if (rv == SECSuccess) {
 	        rv = SECITEM_CopyItem(NULL, retItem, &decodedValue);
 	    }
 	    PORT_FreeArena(tmpArena, PR_FALSE);
 	} else {
 	    rv = SECFailure;
 	}
     }
     SECITEM_FreeItem(&encodedValue, PR_FALSE);
     return rv;
 }
 SECStatus
 CERT_FindBasicConstraintExten(CERTCertificate *cert,
 			      CERTBasicConstraints *value)
 {
     SECItem encodedExtenValue;
     SECStatus rv;
     encodedExtenValue.data = NULL;
     encodedExtenValue.len = 0;
     rv = cert_FindExtension(cert->extensions, SEC_OID_X509_BASIC_CONSTRAINTS,
 			    &encodedExtenValue);
     if ( rv != SECSuccess ) {
 	return (rv);
     }
     rv = CERT_DecodeBasicConstraintValue (value, &encodedExtenValue);
     /* free the raw extension data */
     PORT_Free(encodedExtenValue.data);
     encodedExtenValue.data = NULL;
     return(rv);
 }
 CERTAuthKeyID *
 CERT_FindAuthKeyIDExten (PLArenaPool *arena, CERTCertificate *cert)
 {
     SECItem encodedExtenValue;
     SECStatus rv;
     CERTAuthKeyID *ret;
     encodedExtenValue.data = NULL;
     encodedExtenValue.len = 0;
     rv = cert_FindExtension(cert->extensions, SEC_OID_X509_AUTH_KEY_ID,
 			    &encodedExtenValue);
     if ( rv != SECSuccess ) {
 	return (NULL);
     }
     ret = CERT_DecodeAuthKeyID (arena, &encodedExtenValue);
     PORT_Free(encodedExtenValue.data);
     encodedExtenValue.data = NULL;
     return(ret);
 }
 SECStatus
 CERT_CheckCertUsage(CERTCertificate *cert, unsigned char usage)
 {
     SECItem keyUsage;
     SECStatus rv;
     /* There is no extension, v1 or v2 certificate */
     if (cert->extensions == NULL) {
 	return (SECSuccess);
     }
     keyUsage.data = NULL;
     /* This code formerly ignored the Key Usage extension if it was
     ** marked non-critical.  That was wrong.  Since we do understand it,
     ** we are obligated to honor it, whether or not it is critical.
     */
     rv = CERT_FindKeyUsageExtension(cert, &keyUsage);
     if (rv == SECFailure) {
         rv = (PORT_GetError () == SEC_ERROR_EXTENSION_NOT_FOUND) ?
 	    SECSuccess : SECFailure;
     } else if (!(keyUsage.data[0] & usage)) {
 	PORT_SetError (SEC_ERROR_CERT_USAGES_INVALID);
 	rv = SECFailure;
     }
     PORT_Free (keyUsage.data);
     return (rv);
 }

The Tor Browser / annotate

security/nss/lib/certdb/certv3.c@b8a032363ba2 (annotated)

security/nss/lib/certdb/certv3.c