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//+build gssapi
//+build linux darwin
#include <string.h>
#include <stdio.h>
#include "gss_wrapper.h"
OM_uint32 gssapi_canonicalize_name(
OM_uint32* minor_status,
char *input_name,
gss_OID input_name_type,
gss_name_t *output_name
)
{
OM_uint32 major_status;
gss_name_t imported_name = GSS_C_NO_NAME;
gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
buffer.value = input_name;
buffer.length = strlen(input_name);
major_status = gss_import_name(minor_status, &buffer, input_name_type, &imported_name);
if (GSS_ERROR(major_status)) {
return major_status;
}
major_status = gss_canonicalize_name(minor_status, imported_name, (gss_OID)gss_mech_krb5, output_name);
if (imported_name != GSS_C_NO_NAME) {
OM_uint32 ignored;
gss_release_name(&ignored, &imported_name);
}
return major_status;
}
int gssapi_error_desc(
OM_uint32 maj_stat,
OM_uint32 min_stat,
char **desc
)
{
OM_uint32 stat = maj_stat;
int stat_type = GSS_C_GSS_CODE;
if (min_stat != 0) {
stat = min_stat;
stat_type = GSS_C_MECH_CODE;
}
OM_uint32 local_maj_stat, local_min_stat;
OM_uint32 msg_ctx = 0;
gss_buffer_desc desc_buffer;
do
{
local_maj_stat = gss_display_status(
&local_min_stat,
stat,
stat_type,
GSS_C_NO_OID,
&msg_ctx,
&desc_buffer
);
if (GSS_ERROR(local_maj_stat)) {
return GSSAPI_ERROR;
}
if (*desc) {
free(*desc);
}
*desc = malloc(desc_buffer.length+1);
memcpy(*desc, desc_buffer.value, desc_buffer.length+1);
gss_release_buffer(&local_min_stat, &desc_buffer);
}
while(msg_ctx != 0);
return GSSAPI_OK;
}
int gssapi_client_init(
gssapi_client_state *client,
char* spn,
char* username,
char* password
)
{
client->cred = GSS_C_NO_CREDENTIAL;
client->ctx = GSS_C_NO_CONTEXT;
client->maj_stat = gssapi_canonicalize_name(&client->min_stat, spn, GSS_C_NT_HOSTBASED_SERVICE, &client->spn);
if (GSS_ERROR(client->maj_stat)) {
return GSSAPI_ERROR;
}
if (username) {
gss_name_t name;
client->maj_stat = gssapi_canonicalize_name(&client->min_stat, username, GSS_C_NT_USER_NAME, &name);
if (GSS_ERROR(client->maj_stat)) {
return GSSAPI_ERROR;
}
if (password) {
gss_buffer_desc password_buffer;
password_buffer.value = password;
password_buffer.length = strlen(password);
client->maj_stat = gss_acquire_cred_with_password(&client->min_stat, name, &password_buffer, GSS_C_INDEFINITE, GSS_C_NO_OID_SET, GSS_C_INITIATE, &client->cred, NULL, NULL);
} else {
client->maj_stat = gss_acquire_cred(&client->min_stat, name, GSS_C_INDEFINITE, GSS_C_NO_OID_SET, GSS_C_INITIATE, &client->cred, NULL, NULL);
}
if (GSS_ERROR(client->maj_stat)) {
return GSSAPI_ERROR;
}
OM_uint32 ignored;
gss_release_name(&ignored, &name);
}
return GSSAPI_OK;
}
int gssapi_client_username(
gssapi_client_state *client,
char** username
)
{
OM_uint32 ignored;
gss_name_t name = GSS_C_NO_NAME;
client->maj_stat = gss_inquire_context(&client->min_stat, client->ctx, &name, NULL, NULL, NULL, NULL, NULL, NULL);
if (GSS_ERROR(client->maj_stat)) {
return GSSAPI_ERROR;
}
gss_buffer_desc name_buffer;
client->maj_stat = gss_display_name(&client->min_stat, name, &name_buffer, NULL);
if (GSS_ERROR(client->maj_stat)) {
gss_release_name(&ignored, &name);
return GSSAPI_ERROR;
}
*username = malloc(name_buffer.length+1);
memcpy(*username, name_buffer.value, name_buffer.length+1);
gss_release_buffer(&ignored, &name_buffer);
gss_release_name(&ignored, &name);
return GSSAPI_OK;
}
int gssapi_client_negotiate(
gssapi_client_state *client,
void* input,
size_t input_length,
void** output,
size_t* output_length
)
{
gss_buffer_desc input_buffer = GSS_C_EMPTY_BUFFER;
gss_buffer_desc output_buffer = GSS_C_EMPTY_BUFFER;
if (input) {
input_buffer.value = input;
input_buffer.length = input_length;
}
client->maj_stat = gss_init_sec_context(
&client->min_stat,
client->cred,
&client->ctx,
client->spn,
GSS_C_NO_OID,
GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG,
0,
GSS_C_NO_CHANNEL_BINDINGS,
&input_buffer,
NULL,
&output_buffer,
NULL,
NULL
);
if (output_buffer.length) {
*output = malloc(output_buffer.length);
*output_length = output_buffer.length;
memcpy(*output, output_buffer.value, output_buffer.length);
OM_uint32 ignored;
gss_release_buffer(&ignored, &output_buffer);
}
if (GSS_ERROR(client->maj_stat)) {
return GSSAPI_ERROR;
} else if (client->maj_stat == GSS_S_CONTINUE_NEEDED) {
return GSSAPI_CONTINUE;
}
return GSSAPI_OK;
}
int gssapi_client_wrap_msg(
gssapi_client_state *client,
void* input,
size_t input_length,
void** output,
size_t* output_length
)
{
gss_buffer_desc input_buffer = GSS_C_EMPTY_BUFFER;
gss_buffer_desc output_buffer = GSS_C_EMPTY_BUFFER;
input_buffer.value = input;
input_buffer.length = input_length;
client->maj_stat = gss_wrap(&client->min_stat, client->ctx, 0, GSS_C_QOP_DEFAULT, &input_buffer, NULL, &output_buffer);
if (output_buffer.length) {
*output = malloc(output_buffer.length);
*output_length = output_buffer.length;
memcpy(*output, output_buffer.value, output_buffer.length);
gss_release_buffer(&client->min_stat, &output_buffer);
}
if (GSS_ERROR(client->maj_stat)) {
return GSSAPI_ERROR;
}
return GSSAPI_OK;
}
int gssapi_client_destroy(
gssapi_client_state *client
)
{
OM_uint32 ignored;
if (client->ctx != GSS_C_NO_CONTEXT) {
gss_delete_sec_context(&ignored, &client->ctx, GSS_C_NO_BUFFER);
}
if (client->spn != GSS_C_NO_NAME) {
gss_release_name(&ignored, &client->spn);
}
if (client->cred != GSS_C_NO_CREDENTIAL) {
gss_release_cred(&ignored, &client->cred);
}
return GSSAPI_OK;
}
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