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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/gssapi/mechglue/g_saslname.c */
/*
* Copyright (C) 2010 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "mglueP.h"
#include <krb5/krb5.h>
static char basis_32[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
#define OID_SASL_NAME_LENGTH (sizeof("GS2-XXXXXXXXXXX") - 1)
static OM_uint32
oidToSaslName(OM_uint32 *minor, const gss_OID mech,
char sasl_name[OID_SASL_NAME_LENGTH + 1])
{
unsigned char derBuf[2];
krb5_crypto_iov iov[3];
unsigned char cksumBuf[20], *q = cksumBuf;
char *p = sasl_name;
if (mech->length > 127) {
*minor = ERANGE;
return GSS_S_BAD_MECH;
}
derBuf[0] = 0x06;
derBuf[1] = (unsigned char)mech->length;
iov[0].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY;
iov[0].data.length = 2;
iov[0].data.data = (char *)derBuf;
iov[1].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY;
iov[1].data.length = mech->length;
iov[1].data.data = (char *)mech->elements;
iov[2].flags = KRB5_CRYPTO_TYPE_CHECKSUM;
iov[2].data.length = sizeof(cksumBuf);
iov[2].data.data = (char *)cksumBuf;
*minor = krb5_k_make_checksum_iov(NULL, CKSUMTYPE_NIST_SHA,
NULL, 0, iov, 3);
if (*minor != 0)
return GSS_S_FAILURE;
memcpy(p, "GS2-", 4);
p += 4;
*p++ = basis_32[q[0] >> 3];
*p++ = basis_32[((q[0] & 7) << 2) | (q[1] >> 6)];
*p++ = basis_32[(q[1] & 0x3f) >> 1];
*p++ = basis_32[((q[1] & 1) << 4) | (q[2] >> 4)];
*p++ = basis_32[((q[2] & 0xf) << 1) | (q[3] >> 7)];
*p++ = basis_32[(q[3] & 0x7f) >> 2];
*p++ = basis_32[((q[3] & 3) << 3) | (q[4] >> 5)];
*p++ = basis_32[(q[4] & 0x1f)];
*p++ = basis_32[q[5] >> 3];
*p++ = basis_32[((q[5] & 7) << 2) | (q[6] >> 6)];
*p++ = basis_32[(q[6] & 0x3f) >> 1];
*p++ = '\0';
*minor = 0;
return GSS_S_COMPLETE;
}
static OM_uint32
oidToSaslNameAlloc(OM_uint32 *minor, const gss_OID mech,
gss_buffer_t sasl_name)
{
OM_uint32 status, tmpMinor;
sasl_name->value = malloc(OID_SASL_NAME_LENGTH + 1);
if (sasl_name->value == NULL) {
*minor = ENOMEM;
return GSS_S_FAILURE;
}
sasl_name->length = OID_SASL_NAME_LENGTH;
status = oidToSaslName(minor, mech, (char *)sasl_name->value);
if (GSS_ERROR(status)) {
gss_release_buffer(&tmpMinor, sasl_name);
return status;
}
return GSS_S_COMPLETE;
}
OM_uint32 KRB5_CALLCONV gss_inquire_saslname_for_mech(
OM_uint32 *minor_status,
const gss_OID desired_mech,
gss_buffer_t sasl_mech_name,
gss_buffer_t mech_name,
gss_buffer_t mech_description)
{
OM_uint32 status = GSS_S_BAD_MECH;
gss_mechanism mech;
if (minor_status == NULL)
return GSS_S_CALL_INACCESSIBLE_WRITE;
*minor_status = 0;
if (sasl_mech_name != GSS_C_NO_BUFFER) {
sasl_mech_name->length = 0;
sasl_mech_name->value = NULL;
}
if (mech_name != GSS_C_NO_BUFFER) {
mech_name->length = 0;
mech_name->value = NULL;
}
if (mech_description != GSS_C_NO_BUFFER) {
mech_description->length = 0;
mech_description->value = NULL;
}
mech = gssint_get_mechanism(desired_mech);
if (mech != NULL && mech->gss_inquire_saslname_for_mech != NULL) {
status = mech->gss_inquire_saslname_for_mech(minor_status,
desired_mech,
sasl_mech_name,
mech_name,
mech_description);
}
if (status == GSS_S_BAD_MECH) {
if (sasl_mech_name != GSS_C_NO_BUFFER)
status = oidToSaslNameAlloc(minor_status, desired_mech,
sasl_mech_name);
else
status = GSS_S_COMPLETE;
}
return status;
}
OM_uint32 KRB5_CALLCONV gss_inquire_mech_for_saslname(
OM_uint32 *minor_status,
const gss_buffer_t sasl_mech_name,
gss_OID *mech_type)
{
OM_uint32 status, tmpMinor;
gss_OID_set mechSet = GSS_C_NO_OID_SET;
size_t i;
if (minor_status == NULL)
return GSS_S_CALL_INACCESSIBLE_WRITE;
*minor_status = 0;
if (mech_type != NULL)
*mech_type = GSS_C_NO_OID;
status = gss_indicate_mechs(minor_status, &mechSet);
if (status != GSS_S_COMPLETE)
return status;
for (i = 0, status = GSS_S_BAD_MECH; i < mechSet->count; i++) {
gss_mechanism mech;
char mappedName[OID_SASL_NAME_LENGTH + 1];
mech = gssint_get_mechanism(&mechSet->elements[i]);
if (mech != NULL && mech->gss_inquire_mech_for_saslname != NULL) {
status = mech->gss_inquire_mech_for_saslname(minor_status,
sasl_mech_name,
mech_type);
if (status == GSS_S_COMPLETE)
break;
}
if (status == GSS_S_BAD_MECH &&
sasl_mech_name->length == OID_SASL_NAME_LENGTH &&
oidToSaslName(&tmpMinor, &mechSet->elements[i],
mappedName) == GSS_S_COMPLETE &&
memcmp(sasl_mech_name->value, mappedName,
OID_SASL_NAME_LENGTH) == 0) {
if (mech_type != NULL)
*mech_type = &mech->mech_type;
status = GSS_S_COMPLETE;
break;
}
}
gss_release_oid_set(&tmpMinor, &mechSet);
return status;
}
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