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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
#include "p12plcy.h"
#include "secoid.h"
#include "secport.h"
#include "secpkcs5.h"
#include "secerr.h"
#include "sechash.h"
#define PKCS12_NULL 0x0000
typedef struct pkcs12SuiteMapStr {
SECOidTag algTag;
unsigned int keyLengthBits; /* in bits */
unsigned long suite;
PRBool allowed;
PRBool preferred;
} pkcs12SuiteMap;
static pkcs12SuiteMap pkcs12SuiteMaps[] = {
{ SEC_OID_RC4, 40, PKCS12_RC4_40, PR_FALSE, PR_FALSE },
{ SEC_OID_RC4, 128, PKCS12_RC4_128, PR_FALSE, PR_FALSE },
{ SEC_OID_RC2_CBC, 40, PKCS12_RC2_CBC_40, PR_FALSE, PR_TRUE },
{ SEC_OID_RC2_CBC, 128, PKCS12_RC2_CBC_128, PR_FALSE, PR_FALSE },
{ SEC_OID_DES_CBC, 64, PKCS12_DES_56, PR_FALSE, PR_FALSE },
{ SEC_OID_DES_EDE3_CBC, 192, PKCS12_DES_EDE3_168, PR_FALSE, PR_FALSE },
{ SEC_OID_AES_128_CBC, 128, PKCS12_AES_CBC_128, PR_FALSE, PR_FALSE },
{ SEC_OID_AES_192_CBC, 192, PKCS12_AES_CBC_192, PR_FALSE, PR_FALSE },
{ SEC_OID_AES_256_CBC, 256, PKCS12_AES_CBC_256, PR_FALSE, PR_FALSE },
{ SEC_OID_UNKNOWN, 0, PKCS12_NULL, PR_FALSE, PR_FALSE },
{ SEC_OID_UNKNOWN, 0, 0L, PR_FALSE, PR_FALSE }
};
/* determine if algid is an algorithm which is allowed */
static PRBool
sec_PKCS12Allowed(SECOidTag alg, PRUint32 needed)
{
PRUint32 policy;
SECStatus rv;
rv = NSS_GetAlgorithmPolicy(alg, &policy);
if (rv != SECSuccess) {
return PR_FALSE;
}
if ((policy & needed) == needed) {
return PR_TRUE;
}
return PR_FALSE;
}
PRBool
SEC_PKCS12CipherAllowed(SECOidTag pbeAlg, SECOidTag hmacAlg)
{
SECOidTag cipherAlg = SEC_PKCS5GetCryptoFromAlgTag(pbeAlg);
SECOidTag hashAlg = SEC_PKCS5GetHashFromAlgTag(pbeAlg);
if (cipherAlg == SEC_OID_UNKNOWN) {
/* not a traditional PBE (PKCS5v1 or PKCS12)
* Our PKCS #12 code accepts ciphers algs here
* which get turned into PKCS 5v2 algids. In
* this case we already have the cipher alg */
cipherAlg = pbeAlg;
hashAlg = HASH_GetHashOidTagByHMACOidTag(hmacAlg);
}
if ((cipherAlg == SEC_OID_UNKNOWN) || (hashAlg == SEC_OID_UNKNOWN)) {
return PR_FALSE;
}
if (!sec_PKCS12Allowed(cipherAlg, NSS_USE_ALG_IN_PKCS12)) {
return PR_FALSE;
}
return sec_PKCS12Allowed(hashAlg, NSS_USE_ALG_IN_PKCS12);
}
PRBool
SEC_PKCS12DecryptionAllowed(SECAlgorithmID *algid)
{
SECOidTag algtag;
algtag = SEC_PKCS5GetCryptoAlgorithm(algid);
if (algtag == SEC_OID_UNKNOWN) {
return PR_FALSE;
}
if (!sec_PKCS12Allowed(algtag, NSS_USE_ALG_IN_PKCS12_DECRYPT)) {
return PR_FALSE;
}
algtag = SEC_PKCS5GetHashAlgorithm(algid);
if (algtag == SEC_OID_UNKNOWN) {
return PR_FALSE;
}
return sec_PKCS12Allowed(algtag, NSS_USE_ALG_IN_PKCS12_DECRYPT);
}
PRBool
SEC_PKCS12IntegrityHashAllowed(SECOidTag hashAlg, PRBool verify)
{
return sec_PKCS12Allowed(hashAlg, verify ? NSS_USE_ALG_IN_PKCS12_DECRYPT : NSS_USE_ALG_IN_PKCS12);
}
/* is any encryption allowed? */
PRBool
SEC_PKCS12IsEncryptionAllowed(void)
{
int i;
for (i = 0; pkcs12SuiteMaps[i].algTag != SEC_OID_UNKNOWN; i++) {
/* we're going to return true here if any of the traditional
* algorithms are enabled */
if (sec_PKCS12Allowed(pkcs12SuiteMaps[i].algTag, NSS_USE_ALG_IN_PKCS12)) {
return PR_TRUE;
}
}
return PR_FALSE;
}
/* keep the traditional enable/disable for old ciphers so old applications
* continue to work. This only works for the traditional pkcs12 values,
* you need to use NSS_SetAlgorithmPolicy directly for other ciphers. */
SECStatus
SEC_PKCS12EnableCipher(long which, int on)
{
int i;
PRUint32 set = on ? NSS_USE_ALG_IN_PKCS12 : 0;
PRUint32 clear = on ? 0 : NSS_USE_ALG_IN_PKCS12;
for (i = 0; pkcs12SuiteMaps[i].suite != 0L; i++) {
if (pkcs12SuiteMaps[i].suite == (unsigned long)which) {
return NSS_SetAlgorithmPolicy(pkcs12SuiteMaps[i].algTag, set, clear);
}
}
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return SECFailure;
}
SECStatus
SEC_PKCS12SetPreferredCipher(long which, int on)
{
/* nothing looked at the preferences in the suite maps, so this function
* has always been a noop */
return SECSuccess;
}