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/* Copyright (C) 2014 the GSS-PROXY contributors, see COPYING for license */
#include "t_utils.h"
#include <unistd.h>
#include <stdbool.h>
int main(int argc, const char *argv[])
{
gss_cred_id_t impersonator_cred_handle = GSS_C_NO_CREDENTIAL;
gss_cred_id_t cred_handle = GSS_C_NO_CREDENTIAL;
gss_ctx_id_t init_ctx = GSS_C_NO_CONTEXT;
gss_ctx_id_t accept_ctx = GSS_C_NO_CONTEXT;
gss_buffer_desc in_token = GSS_C_EMPTY_BUFFER;
gss_buffer_desc out_token = GSS_C_EMPTY_BUFFER;
gss_name_t user_name = GSS_C_NO_NAME;
gss_name_t proxy_name = GSS_C_NO_NAME;
gss_name_t target_name = GSS_C_NO_NAME;
gss_OID_set_desc oid_set = { 1, discard_const(gss_mech_krb5) };
uint32_t ret_maj;
uint32_t ret_min;
uint32_t flags = GSS_C_MUTUAL_FLAG | GSS_C_DELEG_FLAG;
int ret = -1;
bool selfhalf = false;
bool proxyhalf = false;
gss_key_value_element_desc ccelement = { "ccache", NULL };
gss_key_value_set_desc cred_store = { 1, &ccelement };
if (argc < 5) return -1;
ret = t_string_to_name(argv[1], &user_name, GSS_C_NT_USER_NAME);
if (ret) {
DEBUG("Failed to import user name from argv[1]\n");
ret = -1;
goto done;
}
ret = t_string_to_name(argv[2], &proxy_name,
GSS_C_NT_HOSTBASED_SERVICE);
if (ret) {
DEBUG("Failed to import server name from argv[2]\n");
ret = -1;
goto done;
}
ret = t_string_to_name(argv[3], &target_name,
GSS_C_NT_HOSTBASED_SERVICE);
if (ret) {
DEBUG("Failed to import server name from argv[2]\n");
ret = -1;
goto done;
}
ccelement.value = argv[4];
if (argc > 5) {
if (strcmp(argv[5], "s4u2self") == 0) {
selfhalf = true;
} else if (strcmp(argv[5], "s4u2proxy") == 0) {
proxyhalf = true;
} else {
DEBUG("Invalid argument 5: %s\n", argv[5]);
ret = -1;
goto done;
}
DEBUG("S4U2%s half\n", selfhalf ? "Self" : "Proxy");
}
if (proxyhalf) {
ret_maj = gss_acquire_cred_from(&ret_min,
user_name,
GSS_C_INDEFINITE,
&oid_set,
GSS_C_INITIATE,
&cred_store,
&cred_handle,
NULL, NULL);
if (ret_maj != GSS_S_COMPLETE) {
DEBUG("gss_acquire_cred_from() [s4u2proxy] failed\n");
t_log_failure(GSS_C_NO_OID, ret_maj, ret_min);
ret = -1;
goto done;
}
flags = GSS_C_MUTUAL_FLAG;
} else {
ret_maj = gss_acquire_cred_from(&ret_min,
proxy_name,
GSS_C_INDEFINITE,
&oid_set,
GSS_C_BOTH,
&cred_store,
&impersonator_cred_handle,
NULL, NULL);
if (ret_maj != GSS_S_COMPLETE) {
DEBUG("gss_acquire_cred_from() [%s] failed\n",
selfhalf ? "s4u2self" : "impersonate");
t_log_failure(GSS_C_NO_OID, ret_maj, ret_min);
ret = -1;
goto done;
}
ret_maj = gss_acquire_cred_impersonate_name(&ret_min,
impersonator_cred_handle,
user_name,
GSS_C_INDEFINITE,
&oid_set,
GSS_C_INITIATE,
&cred_handle,
NULL, NULL);
if (ret_maj != GSS_S_COMPLETE) {
DEBUG("gss_acquire_cred_impersonate_name() failed\n");
t_log_failure(GSS_C_NO_OID, ret_maj, ret_min);
ret = -1;
goto done;
}
}
if (selfhalf) {
ret_maj = gss_store_cred_into(&ret_min,
cred_handle,
GSS_C_INITIATE,
discard_const(gss_mech_krb5), 1, 0,
&cred_store, NULL, NULL);
if (ret_maj != GSS_S_COMPLETE) {
DEBUG("gss_store_cred_into() failed\n");
t_log_failure(GSS_C_NO_OID, ret_maj, ret_min);
ret = -1;
}
goto done;
}
ret_maj = gss_init_sec_context(&ret_min,
cred_handle,
&init_ctx,
target_name,
GSS_C_NO_OID,
flags,
0,
GSS_C_NO_CHANNEL_BINDINGS,
&in_token,
NULL,
&out_token,
NULL,
NULL);
if (ret_maj != GSS_S_CONTINUE_NEEDED) {
DEBUG("gss_init_sec_context() failed\n");
t_log_failure(GSS_C_NO_OID, ret_maj, ret_min);
ret = -1;
goto done;
}
/* We get stuff from stdin and spit it out on stderr */
if (!out_token.length) {
DEBUG("No output token ?");
ret = -1;
goto done;
}
/* in/out token inverted here intentionally */
ret_maj = gss_accept_sec_context(&ret_min,
&accept_ctx,
GSS_C_NO_CREDENTIAL,
&out_token,
GSS_C_NO_CHANNEL_BINDINGS,
NULL,
NULL,
&in_token,
NULL,
NULL,
NULL);
if (ret_maj) {
DEBUG("Error accepting context\n");
t_log_failure(GSS_C_NO_OID, ret_maj, ret_min);
ret = -1;
goto done;
}
if (!in_token.length) {
DEBUG("No output token ?");
ret = -1;
goto done;
}
gss_release_buffer(&ret_min, &out_token);
ret_maj = gss_init_sec_context(&ret_min,
cred_handle,
&init_ctx,
target_name,
GSS_C_NO_OID,
flags,
0,
GSS_C_NO_CHANNEL_BINDINGS,
&in_token,
NULL,
&out_token,
NULL,
NULL);
if (ret_maj) {
DEBUG("Error initializing context\n");
t_log_failure(GSS_C_NO_OID, ret_maj, ret_min);
ret = -1;
goto done;
}
ret = 0;
done:
gss_release_name(&ret_min, &user_name);
gss_release_name(&ret_min, &proxy_name);
gss_release_name(&ret_min, &target_name);
gss_release_buffer(&ret_min, &in_token);
gss_release_buffer(&ret_min, &out_token);
gss_release_cred(&ret_min, &impersonator_cred_handle);
gss_release_cred(&ret_min, &cred_handle);
gss_delete_sec_context(&ret_min, &accept_ctx, GSS_C_NO_BUFFER);
gss_delete_sec_context(&ret_min, &init_ctx, GSS_C_NO_BUFFER);
return ret;
}
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