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/* Copyright (C) 2011 the GSS-PROXY contributors, see COPYING for license */
#include "gp_rpc_process.h"
#include <gssapi/gssapi_krb5.h>
int gp_acquire_cred(struct gp_call_ctx *gpcall,
union gp_rpc_arg *arg,
union gp_rpc_res *res)
{
struct gssx_arg_acquire_cred *aca;
struct gssx_res_acquire_cred *acr;
uint32_t ret_maj;
uint32_t ret_min;
gss_cred_id_t in_cred = GSS_C_NO_CREDENTIAL;
gss_OID_set desired_mechs = GSS_C_NO_OID_SET;
gss_OID_set use_mechs = GSS_C_NO_OID_SET;
gss_OID desired_mech = GSS_C_NO_OID;
gss_cred_usage_t cred_usage;
gss_cred_id_t out_cred = GSS_C_NO_CREDENTIAL;
gss_cred_id_t *add_out_cred = NULL;
int ret;
int i;
aca = &arg->acquire_cred;
acr = &res->acquire_cred;
GPRPCDEBUG(gssx_arg_acquire_cred, aca);
if (aca->input_cred_handle) {
ret_maj = gp_import_gssx_cred(&ret_min, gpcall,
aca->input_cred_handle, &in_cred);
if (ret_maj) {
goto done;
}
}
if (aca->add_cred_to_input_handle) {
add_out_cred = &in_cred;
} else {
add_out_cred = &out_cred;
}
ret = gp_conv_gssx_to_oid_set(&aca->desired_mechs, &desired_mechs);
if (ret) {
ret_maj = GSS_S_FAILURE;
ret_min = ret;
goto done;
}
/* if a mech list is specified check if it includes the mechs
* allowed by this service configuration */
if (desired_mechs != GSS_C_NO_OID_SET) {
ret_maj = gss_create_empty_oid_set(&ret_min, &use_mechs);
if (ret_maj) {
goto done;
}
for (i = 0; i < desired_mechs->count; i++) {
desired_mech = &desired_mechs->elements[i];
if (!gp_creds_allowed_mech(gpcall, desired_mech)) {
continue;
}
ret_maj = gss_add_oid_set_member(&ret_min,
desired_mech, &use_mechs);
if (ret_maj) {
goto done;
}
}
if (use_mechs->count == 0) {
/* no allowed mech, return nothing */
desired_mech = GSS_C_NO_OID;
ret_maj = GSS_S_NO_CRED;
ret_min = 0;
goto done;
}
} else {
ret_maj = gp_get_supported_mechs(&ret_min, &use_mechs);
if (ret_maj) {
goto done;
}
}
cred_usage = gp_conv_gssx_to_cred_usage(aca->cred_usage);
for (i = 0; i < use_mechs->count; i++) {
desired_mech = &use_mechs->elements[i];
/* this should really be folded into an extended
* gss_add_cred in gssapi that can accept a set of URIs
* that define keytabs and ccaches and principals */
if (gss_oid_equal(desired_mech, gss_mech_krb5)) {
ret_maj = gp_add_krb5_creds(&ret_min,
gpcall,
in_cred,
aca->desired_name,
cred_usage,
aca->initiator_time_req,
aca->acceptor_time_req,
add_out_cred,
NULL,
NULL,
NULL);
if (ret_maj) {
goto done;
}
} else {
/* we support only the krb5 mech for now */
ret_maj = GSS_S_BAD_MECH;
goto done;
}
}
if (out_cred == GSS_C_NO_CREDENTIAL) {
if (in_cred != GSS_C_NO_CREDENTIAL) {
out_cred = in_cred;
} else {
ret_maj = GSS_S_NO_CRED;
ret_min = 0;
goto done;
}
}
acr->output_cred_handle = calloc(1, sizeof(gssx_cred));
if (!acr->output_cred_handle) {
ret_maj = GSS_S_FAILURE;
ret_min = ENOMEM;
goto done;
}
ret_maj = gp_export_gssx_cred(&ret_min, gpcall,
&out_cred, acr->output_cred_handle);
if (ret_maj) {
goto done;
}
done:
ret = gp_conv_status_to_gssx(&aca->call_ctx,
ret_maj, ret_min, desired_mech,
&acr->status);
GPRPCDEBUG(gssx_res_acquire_cred, acr);
gss_release_cred(&ret_min, &out_cred);
gss_release_oid_set(&ret_min, &use_mechs);
gss_release_oid_set(&ret_min, &desired_mechs);
return ret;
}
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