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/*
* SPNEGO wrapper for Kerberos5 GSS-API
* kouril@ics.muni.cz, 2003
* (mostly based on Heimdal code)
*/
#include "spnegokrb5_locl.h"
static int
add_mech(MechTypeList *mech_list, gss_OID mech)
{
MechType *tmp;
int ret;
tmp = realloc(mech_list->val, (mech_list->len + 1) * sizeof(*tmp));
if (tmp == NULL)
return ENOMEM;
mech_list->val = tmp;
ret = der_get_oid(mech->elements, mech->length,
&mech_list->val[mech_list->len], NULL);
if (ret)
return ret;
mech_list->len++;
return 0;
}
#if 0
static int
set_context_flags(OM_uint32 req_flags, ContextFlags *flags)
{
if (req_flags & GSS_C_DELEG_FLAG)
flags->delegFlag = 1;
if (req_flags & GSS_C_MUTUAL_FLAG)
flags->mutualFlag = 1;
if (req_flags & GSS_C_REPLAY_FLAG)
flags->replayFlag = 1;
if (req_flags & GSS_C_SEQUENCE_FLAG)
flags->sequenceFlag = 1;
if (req_flags & GSS_C_ANON_FLAG)
flags->anonFlag = 1;
if (req_flags & GSS_C_CONF_FLAG)
flags->confFlag = 1;
if (req_flags & GSS_C_INTEG_FLAG)
flags->integFlag = 1;
return 0;
}
#endif
OM_uint32 KRB5_LIB_FUNCTION gss_init_sec_context_spnego(
OM_uint32 * minor_status,
const gss_cred_id_t initiator_cred_handle,
gss_ctx_id_t * context_handle,
const gss_name_t target_name,
const gss_OID mech_type,
OM_uint32 req_flags,
OM_uint32 time_req,
const gss_channel_bindings_t input_chan_bindings,
const gss_buffer_t input_token,
gss_OID * actual_mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec)
{
NegTokenInit token_init;
OM_uint32 major_status, minor_status2;
gss_buffer_desc krb5_output_token = GSS_C_EMPTY_BUFFER;
unsigned char *buf = NULL;
size_t buf_size;
size_t len;
int ret;
memset(&token_init, 0, sizeof(token_init));
ALLOC(token_init.mechTypes);
if (token_init.mechTypes == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
ret = add_mech(token_init.mechTypes, GSS_KRB5_MECH);
if (ret) {
*minor_status = ret;
ret = GSS_S_FAILURE;
goto end;
}
#if 0
ALLOC(token_init.reqFlags);
if (token_init.reqFlags == NULL) {
*minor_status = ENOMEM;
ret = GSS_S_FAILURE;
goto end;
}
set_context_flags(req_flags, token_init.reqFlags);
#endif
major_status = gss_init_sec_context(minor_status,
initiator_cred_handle,
context_handle,
target_name,
GSS_KRB5_MECH,
req_flags,
time_req,
input_chan_bindings,
input_token,
actual_mech_type,
&krb5_output_token,
ret_flags,
time_rec);
if (GSS_ERROR(major_status)) {
ret = major_status;
goto end;
}
if (krb5_output_token.length > 0) {
ALLOC(token_init.mechToken);
if (token_init.mechToken == NULL) {
*minor_status = ENOMEM;
ret = GSS_S_FAILURE;
goto end;
}
token_init.mechToken->data = krb5_output_token.value;
token_init.mechToken->length = krb5_output_token.length;
krb5_output_token.length = 0; /* don't free it later */
}
/* The MS implementation of SPNEGO seems to not like the mechListMIC field,
* so we omit it (it's optional anyway) */
buf_size = 1024;
buf = malloc(buf_size);
do {
ret = encode_NegTokenInit(buf + buf_size -1,
buf_size,
&token_init, &len);
if (ret == 0) {
size_t tmp;
ret = der_put_length_and_tag(buf + buf_size - len - 1,
buf_size - len,
len,
KERB_CTXT,
CONS,
0,
&tmp);
if (ret == 0)
len += tmp;
}
if (ret) {
if (ret == ASN1_OVERFLOW) {
u_char *tmp;
buf_size *= 2;
tmp = realloc (buf, buf_size);
if (tmp == NULL) {
*minor_status = ENOMEM;
ret = GSS_S_FAILURE;
goto end;
}
buf = tmp;
} else {
*minor_status = ret;
ret = GSS_S_FAILURE;
goto end;
}
}
} while (ret == ASN1_OVERFLOW);
ret = gssapi_spnego_encapsulate(minor_status,
buf + buf_size - len, len,
output_token, GSS_SPNEGO_MECH);
ret = major_status;
end:
free_NegTokenInit(&token_init);
if (krb5_output_token.length > 0)
gss_release_buffer(&minor_status2, &krb5_output_token);
if (buf)
free(buf);
return ret;
}
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