static Shishi_asn1
_shishi_kdcreq (Shishi * handle, int as)
{
int res;
Shishi_asn1 node;
const char *servicebuf[3];
uint32_t nonce;
if (as)
node = shishi_asn1_asreq (handle);
else
node = shishi_asn1_tgsreq (handle);
if (!node)
return NULL;
res = shishi_asn1_write (handle, node, "pvno",
SHISHI_KDCREQ_DEFAULT_PVNO,
SHISHI_KDCREQ_DEFAULT_PVNO_LEN);
if (res != SHISHI_OK)
goto error;
if (as)
res = shishi_asn1_write (handle, node, "msg-type",
SHISHI_AS_REQ_DEFAULT_MSG_TYPE,
SHISHI_AS_REQ_DEFAULT_MSG_TYPE_LEN);
else
res = shishi_asn1_write (handle, node, "msg-type",
SHISHI_TGS_REQ_DEFAULT_MSG_TYPE,
SHISHI_TGS_REQ_DEFAULT_MSG_TYPE_LEN);
if (res != SHISHI_OK)
goto error;
res = shishi_asn1_write (handle, node, "req-body.kdc-options",
SHISHI_KDCREQ_DEFAULT_REQ_BODY_KDC_OPTIONS,
SHISHI_KDCREQ_DEFAULT_REQ_BODY_KDC_OPTIONS_LEN);
if (res != SHISHI_OK)
goto error;
if (as)
res = shishi_kdcreq_set_cname (handle, node, SHISHI_NT_PRINCIPAL,
shishi_principal_default (handle));
else
res = shishi_asn1_write (handle, node, "req-body.cname", NULL, 0);
if (res != SHISHI_OK)
goto error;
res = shishi_kdcreq_set_realm (handle, node, shishi_realm_default (handle));
if (res != SHISHI_OK)
goto error;
servicebuf[0] = "krbtgt";
servicebuf[1] = shishi_realm_default (handle);
servicebuf[2] = NULL;
res = shishi_kdcreq_set_sname (handle, node,
SHISHI_NT_PRINCIPAL, servicebuf);
if (res != SHISHI_OK)
goto error;
res = shishi_asn1_write (handle, node, "req-body.sname.name-type",
SHISHI_KDCREQ_DEFAULT_REQ_BODY_SNAME_NAME_TYPE,
SHISHI_KDCREQ_DEFAULT_REQ_BODY_SNAME_NAME_TYPE_LEN);
if (res != SHISHI_OK)
goto error;
res = shishi_asn1_write (handle, node, "req-body.till",
shishi_generalize_time (handle,
time (NULL) +
handle->ticketlife), 0);
if (res != SHISHI_OK)
goto error;
shishi_randomize (handle, 0, &nonce, sizeof (nonce));
nonce &= 0x7FFFFFFF; /* XXX fix _libtasn1_convert_integer. */
res = shishi_kdcreq_nonce_set (handle, node, nonce);
if (res != SHISHI_OK)
goto error;
res = shishi_kdcreq_set_etype (handle, node, handle->clientkdcetypes,
handle->nclientkdcetypes);
if (res != SHISHI_OK)
goto error;
res = shishi_asn1_write (handle, node, "req-body.addresses", NULL, 0);
if (res != SHISHI_OK)
goto error;
res = shishi_asn1_write (handle, node,
"req-body.enc-authorization-data", NULL, 0);
if (res != SHISHI_OK)
goto error;
res =
shishi_asn1_write (handle, node, "req-body.additional-tickets", NULL, 0);
if (res != SHISHI_OK)
goto error;
return node;
error:
shishi_asn1_done (handle, node);
return NULL;
}
int
_gsasl_kerberos_v5_client_step (Gsasl_session * sctx,
void *mech_data,
const char *input,
size_t input_len,
char *output, size_t * output_len)
{
struct _Gsasl_kerberos_v5_client_state *state = mech_data;
Gsasl_client_callback_authentication_id cb_authentication_id;
Gsasl_client_callback_authorization_id cb_authorization_id;
Gsasl_client_callback_qop cb_qop;
Gsasl_client_callback_realm cb_realm;
Gsasl_client_callback_password cb_password;
Gsasl_client_callback_service cb_service;
Gsasl_client_callback_maxbuf cb_maxbuf;
Gsasl_ctx *ctx;
int res;
int len;
ctx = gsasl_client_ctx_get (sctx);
if (ctx == NULL)
return GSASL_CANNOT_GET_CTX;
/* These are optional */
cb_realm = gsasl_client_callback_realm_get (ctx);
cb_service = gsasl_client_callback_service_get (ctx);
cb_authentication_id = gsasl_client_callback_authentication_id_get (ctx);
cb_authorization_id = gsasl_client_callback_authorization_id_get (ctx);
cb_qop = gsasl_client_callback_qop_get (ctx);
cb_maxbuf = gsasl_client_callback_maxbuf_get (ctx);
/* Only optionally needed in infrastructure mode */
cb_password = gsasl_client_callback_password_get (ctx);
if (cb_password == NULL)
return GSASL_NEED_CLIENT_PASSWORD_CALLBACK;
/* I think we really need this one */
cb_service = gsasl_client_callback_service_get (ctx);
if (cb_service == NULL)
return GSASL_NEED_CLIENT_SERVICE_CALLBACK;
switch (state->step)
{
case STEP_FIRST:
if (input == NULL)
{
*output_len = 0;
return GSASL_NEEDS_MORE;
}
if (input_len != SERVER_HELLO_LEN)
return GSASL_MECHANISM_PARSE_ERROR;
memcpy (state->serverhello, input, input_len);
{
unsigned char serverbitmap;
memcpy (&serverbitmap, input, BITMAP_LEN);
state->serverqops = 0;
if (serverbitmap & GSASL_QOP_AUTH)
state->serverqops |= GSASL_QOP_AUTH;
if (serverbitmap & GSASL_QOP_AUTH_INT)
state->serverqops |= GSASL_QOP_AUTH_INT;
if (serverbitmap & GSASL_QOP_AUTH_CONF)
state->serverqops |= GSASL_QOP_AUTH_CONF;
if (serverbitmap & MUTUAL)
state->servermutual = 1;
}
memcpy (&state->servermaxbuf, &input[BITMAP_LEN], MAXBUF_LEN);
state->servermaxbuf = ntohl (state->servermaxbuf);
if (cb_qop)
state->clientqop = cb_qop (sctx, state->serverqops);
if (!(state->serverqops & state->clientqop &
(GSASL_QOP_AUTH | GSASL_QOP_AUTH_INT | GSASL_QOP_AUTH_CONF)))
return GSASL_AUTHENTICATION_ERROR;
/* XXX for now we require server authentication */
if (!state->servermutual)
return GSASL_AUTHENTICATION_ERROR;
/* Decide policy here: non-infrastructure, infrastructure or proxy.
*
* A callback to decide should be added, but without the default
* should be:
*
* IF shishi_tktset_get_for_server() THEN
* INFRASTRUCTURE MODE
* ELSE IF shishi_realm_for_server(server) THEN
* PROXY INFRASTRUCTURE (then fallback to NIM?)
* ELSE
* NON-INFRASTRUCTURE MODE
*/
state->step = STEP_NONINFRA_SEND_APREQ; /* only NIM for now.. */
/* fall through */
case STEP_NONINFRA_SEND_ASREQ:
res = shishi_as (state->sh, &state->as);
if (res)
return GSASL_KERBEROS_V5_INTERNAL_ERROR;
if (cb_authentication_id) /* Shishi defaults to one otherwise */
{
len = *output_len - 1;
res = cb_authentication_id (sctx, output, &len);
if (res != GSASL_OK)
return res;
output[len] = '\0';
res = shishi_kdcreq_set_cname (state->sh, shishi_as_req (state->as),
SHISHI_NT_UNKNOWN, output);
if (res != GSASL_OK)
return res;
}
if (cb_realm)
{
len = *output_len - 1;
res = cb_realm (sctx, output, &len);
if (res != GSASL_OK)
return res;
}
else
len = 0;
output[len] = '\0';
res = shishi_kdcreq_set_realm (state->sh, shishi_as_req (state->as),
output);
if (res != GSASL_OK)
return res;
if (cb_service)
{
char *sname[3];
size_t servicelen = 0;
size_t hostnamelen = 0;
res = cb_service (sctx, NULL, &servicelen, NULL, &hostnamelen,
/* XXX support servicename a'la DIGEST-MD5 too? */
NULL, NULL);
if (res != GSASL_OK)
return res;
if (*output_len < servicelen + 1 + hostnamelen + 1)
return GSASL_TOO_SMALL_BUFFER;
sname[0] = &output[0];
sname[1] = &output[servicelen + 2];
sname[2] = NULL;
res = cb_service (sctx, sname[0], &servicelen,
sname[1], &hostnamelen, NULL, NULL);
if (res != GSASL_OK)
return res;
sname[0][servicelen] = '\0';
sname[1][hostnamelen] = '\0';
res = shishi_kdcreq_set_sname (state->sh, shishi_as_req (state->as),
SHISHI_NT_UNKNOWN, sname);
if (res != GSASL_OK)
return res;
}
/* XXX query application for encryption types and set the etype
field? Already configured by shishi though... */
res = shishi_a2d (state->sh, shishi_as_req (state->as),
output, output_len);
if (res != SHISHI_OK)
return GSASL_KERBEROS_V5_INTERNAL_ERROR;
state->step = STEP_NONINFRA_WAIT_ASREP;
res = GSASL_NEEDS_MORE;
break;
case STEP_NONINFRA_WAIT_ASREP:
if (shishi_as_rep_der_set (state->as, input, input_len) != SHISHI_OK)
return GSASL_MECHANISM_PARSE_ERROR;
/* XXX? password stored in callee's output buffer */
len = *output_len - 1;
res = cb_password (sctx, output, &len);
if (res != GSASL_OK && res != GSASL_NEEDS_MORE)
return res;
output[len] = '\0';
res = shishi_as_rep_process (state->as, NULL, output);
if (res != SHISHI_OK)
return GSASL_AUTHENTICATION_ERROR;
state->step = STEP_NONINFRA_SEND_APREQ;
/* fall through */
case STEP_NONINFRA_SEND_APREQ:
if (*output_len <= CLIENT_HELLO_LEN + SERVER_HELLO_LEN)
return GSASL_TOO_SMALL_BUFFER;
if (!(state->clientqop & ~GSASL_QOP_AUTH))
state->clientmaxbuf = 0;
else if (cb_maxbuf)
state->clientmaxbuf = cb_maxbuf (sctx, state->servermaxbuf);
else
state->clientmaxbuf = MAXBUF_DEFAULT;
/* XXX for now we require server authentication */
output[0] = state->clientqop | MUTUAL;
{
uint32_t tmp;
tmp = ntohl (state->clientmaxbuf);
memcpy (&output[BITMAP_LEN], &tmp, MAXBUF_LEN);
}
memcpy (&output[CLIENT_HELLO_LEN], state->serverhello,
SERVER_HELLO_LEN);
if (cb_authorization_id)
{
len = *output_len - CLIENT_HELLO_LEN + SERVER_HELLO_LEN;
res = cb_authorization_id (sctx, &output[CLIENT_HELLO_LEN +
SERVER_HELLO_LEN], &len);
}
else
len = 0;
len += CLIENT_HELLO_LEN + SERVER_HELLO_LEN;
res = shishi_ap_tktoptionsdata (state->sh,
&state->ap,
shishi_as_tkt (state->as),
SHISHI_APOPTIONS_MUTUAL_REQUIRED,
output, len);
if (res != SHISHI_OK)
return GSASL_KERBEROS_V5_INTERNAL_ERROR;
res = shishi_authenticator_add_authorizationdata
(state->sh, shishi_ap_authenticator (state->ap), -1, output, len);
if (res != SHISHI_OK)
return GSASL_KERBEROS_V5_INTERNAL_ERROR;
/* XXX set realm in AP-REQ and Authenticator */
res = shishi_ap_req_der (state->ap, output, output_len);
if (res != SHISHI_OK)
return GSASL_KERBEROS_V5_INTERNAL_ERROR;
state->step = STEP_NONINFRA_WAIT_APREP;
res = GSASL_NEEDS_MORE;
break;
case STEP_NONINFRA_WAIT_APREP:
if (shishi_ap_rep_der_set (state->ap, input, input_len) != SHISHI_OK)
return GSASL_MECHANISM_PARSE_ERROR;
res = shishi_ap_rep_verify (state->ap);
if (res != SHISHI_OK)
return GSASL_AUTHENTICATION_ERROR;
state->step = STEP_SUCCESS;
/* XXX support AP session keys */
state->sessionkey = shishi_tkt_key (shishi_as_tkt (state->as));
*output_len = 0;
res = GSASL_OK;
break;
default:
res = GSASL_MECHANISM_CALLED_TOO_MANY_TIMES;
break;
}
return res;
}
