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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#if !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
#include "urldata.h"
#include "sendf.h"
#include "http_negotiate.h"
#include "vauth/vauth.h"
#include "vtls/vtls.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
CURLcode Curl_input_negotiate(struct Curl_easy *data, struct connectdata *conn,
bool proxy, const char *header)
{
CURLcode result;
size_t len;
/* Point to the username, password, service and host */
const char *userp;
const char *passwdp;
const char *service;
const char *host;
/* Point to the correct struct with this */
struct negotiatedata *neg_ctx;
curlnegotiate state;
if(proxy) {
#ifndef CURL_DISABLE_PROXY
userp = conn->http_proxy.user;
passwdp = conn->http_proxy.passwd;
service = data->set.str[STRING_PROXY_SERVICE_NAME] ?
data->set.str[STRING_PROXY_SERVICE_NAME] : "HTTP";
host = conn->http_proxy.host.name;
neg_ctx = &conn->proxyneg;
state = conn->proxy_negotiate_state;
#else
return CURLE_NOT_BUILT_IN;
#endif
}
else {
userp = conn->user;
passwdp = conn->passwd;
service = data->set.str[STRING_SERVICE_NAME] ?
data->set.str[STRING_SERVICE_NAME] : "HTTP";
host = conn->host.name;
neg_ctx = &conn->negotiate;
state = conn->http_negotiate_state;
}
/* Not set means empty */
if(!userp)
userp = "";
if(!passwdp)
passwdp = "";
/* Obtain the input token, if any */
header += strlen("Negotiate");
while(*header && ISBLANK(*header))
header++;
len = strlen(header);
neg_ctx->havenegdata = len != 0;
if(!len) {
if(state == GSS_AUTHSUCC) {
infof(data, "Negotiate auth restarted");
Curl_http_auth_cleanup_negotiate(conn);
}
else if(state != GSS_AUTHNONE) {
/* The server rejected our authentication and has not supplied any more
negotiation mechanisms */
Curl_http_auth_cleanup_negotiate(conn);
return CURLE_LOGIN_DENIED;
}
}
/* Supports SSL channel binding for Windows ISS extended protection */
#if defined(USE_WINDOWS_SSPI) && defined(SECPKG_ATTR_ENDPOINT_BINDINGS)
neg_ctx->sslContext = conn->sslContext;
#endif
/* Check if the connection is using SSL and get the channel binding data */
#ifdef HAVE_GSSAPI
if(conn->handler->flags & PROTOPT_SSL) {
Curl_dyn_init(&neg_ctx->channel_binding_data, SSL_CB_MAX_SIZE);
result = Curl_ssl_get_channel_binding(
data, FIRSTSOCKET, &neg_ctx->channel_binding_data);
if(result) {
Curl_http_auth_cleanup_negotiate(conn);
return result;
}
}
#endif
/* Initialize the security context and decode our challenge */
result = Curl_auth_decode_spnego_message(data, userp, passwdp, service,
host, header, neg_ctx);
#ifdef HAVE_GSSAPI
Curl_dyn_free(&neg_ctx->channel_binding_data);
#endif
if(result)
Curl_http_auth_cleanup_negotiate(conn);
return result;
}
CURLcode Curl_output_negotiate(struct Curl_easy *data,
struct connectdata *conn, bool proxy)
{
struct negotiatedata *neg_ctx;
struct auth *authp;
curlnegotiate *state;
char *base64 = NULL;
size_t len = 0;
char *userp;
CURLcode result;
if(proxy) {
#ifndef CURL_DISABLE_PROXY
neg_ctx = &conn->proxyneg;
authp = &data->state.authproxy;
state = &conn->proxy_negotiate_state;
#else
return CURLE_NOT_BUILT_IN;
#endif
}
else {
neg_ctx = &conn->negotiate;
authp = &data->state.authhost;
state = &conn->http_negotiate_state;
}
authp->done = FALSE;
if(*state == GSS_AUTHRECV) {
if(neg_ctx->havenegdata) {
neg_ctx->havemultiplerequests = TRUE;
}
}
else if(*state == GSS_AUTHSUCC) {
if(!neg_ctx->havenoauthpersist) {
neg_ctx->noauthpersist = !neg_ctx->havemultiplerequests;
}
}
if(neg_ctx->noauthpersist ||
(*state != GSS_AUTHDONE && *state != GSS_AUTHSUCC)) {
if(neg_ctx->noauthpersist && *state == GSS_AUTHSUCC) {
infof(data, "Curl_output_negotiate, "
"no persistent authentication: cleanup existing context");
Curl_http_auth_cleanup_negotiate(conn);
}
if(!neg_ctx->context) {
result = Curl_input_negotiate(data, conn, proxy, "Negotiate");
if(result == CURLE_AUTH_ERROR) {
/* negotiate auth failed, let's continue unauthenticated to stay
* compatible with the behavior before curl-7_64_0-158-g6c6035532 */
authp->done = TRUE;
return CURLE_OK;
}
else if(result)
return result;
}
result = Curl_auth_create_spnego_message(neg_ctx, &base64, &len);
if(result)
return result;
userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
base64);
if(proxy) {
#ifndef CURL_DISABLE_PROXY
Curl_safefree(data->state.aptr.proxyuserpwd);
data->state.aptr.proxyuserpwd = userp;
#endif
}
else {
Curl_safefree(data->state.aptr.userpwd);
data->state.aptr.userpwd = userp;
}
free(base64);
if(!userp) {
return CURLE_OUT_OF_MEMORY;
}
*state = GSS_AUTHSENT;
#ifdef HAVE_GSSAPI
if(neg_ctx->status == GSS_S_COMPLETE ||
neg_ctx->status == GSS_S_CONTINUE_NEEDED) {
*state = GSS_AUTHDONE;
}
#else
#ifdef USE_WINDOWS_SSPI
if(neg_ctx->status == SEC_E_OK ||
neg_ctx->status == SEC_I_CONTINUE_NEEDED) {
*state = GSS_AUTHDONE;
}
#endif
#endif
}
if(*state == GSS_AUTHDONE || *state == GSS_AUTHSUCC) {
/* connection is already authenticated,
* do not send a header in future requests */
authp->done = TRUE;
}
neg_ctx->havenegdata = FALSE;
return CURLE_OK;
}
void Curl_http_auth_cleanup_negotiate(struct connectdata *conn)
{
conn->http_negotiate_state = GSS_AUTHNONE;
conn->proxy_negotiate_state = GSS_AUTHNONE;
Curl_auth_cleanup_spnego(&conn->negotiate);
Curl_auth_cleanup_spnego(&conn->proxyneg);
}
#endif /* !CURL_DISABLE_HTTP && USE_SPNEGO */
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