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280 lines
8.2 KiB
C
280 lines
8.2 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* RFC4178 Simple and Protected GSS-API Negotiation Mechanism
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if defined(HAVE_GSSAPI) && defined(USE_SPNEGO)
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#include <curl/curl.h>
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#include "vauth/vauth.h"
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#include "urldata.h"
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#include "curl_base64.h"
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#include "curl_gssapi.h"
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#include "warnless.h"
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#include "curl_multibyte.h"
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#include "sendf.h"
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/* The last #include files should be: */
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#include "curl_memory.h"
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#include "memdebug.h"
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/*
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* Curl_auth_is_spnego_supported()
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*
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* This is used to evaluate if SPNEGO (Negotiate) is supported.
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*
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* Parameters: None
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*
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* Returns TRUE if Negotiate supported by the GSS-API library.
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*/
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bool Curl_auth_is_spnego_supported(void)
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{
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return TRUE;
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}
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/*
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* Curl_auth_decode_spnego_message()
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*
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* This is used to decode an already encoded SPNEGO (Negotiate) challenge
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* message.
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*
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* Parameters:
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*
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* data [in] - The session handle.
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* userp [in] - The user name in the format User or Domain\User.
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* passwdp [in] - The user's password.
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* service [in] - The service type such as http, smtp, pop or imap.
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* host [in] - The host name.
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* chlg64 [in] - The optional base64 encoded challenge message.
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* nego [in/out] - The Negotiate data struct being used and modified.
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*
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* Returns CURLE_OK on success.
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*/
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CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
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const char *user,
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const char *password,
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const char *service,
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const char *host,
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const char *chlg64,
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struct negotiatedata *nego)
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{
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CURLcode result = CURLE_OK;
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size_t chlglen = 0;
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unsigned char *chlg = NULL;
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OM_uint32 major_status;
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OM_uint32 minor_status;
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OM_uint32 unused_status;
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gss_buffer_desc spn_token = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
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(void) user;
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(void) password;
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if(nego->context && nego->status == GSS_S_COMPLETE) {
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/* We finished successfully our part of authentication, but server
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* rejected it (since we're again here). Exit with an error since we
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* can't invent anything better */
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Curl_auth_cleanup_spnego(nego);
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return CURLE_LOGIN_DENIED;
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}
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if(!nego->spn) {
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/* Generate our SPN */
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char *spn = Curl_auth_build_spn(service, NULL, host);
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if(!spn)
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return CURLE_OUT_OF_MEMORY;
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/* Populate the SPN structure */
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spn_token.value = spn;
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spn_token.length = strlen(spn);
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/* Import the SPN */
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major_status = gss_import_name(&minor_status, &spn_token,
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GSS_C_NT_HOSTBASED_SERVICE,
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&nego->spn);
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if(GSS_ERROR(major_status)) {
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Curl_gss_log_error(data, "gss_import_name() failed: ",
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major_status, minor_status);
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free(spn);
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return CURLE_AUTH_ERROR;
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}
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free(spn);
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}
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if(chlg64 && *chlg64) {
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/* Decode the base-64 encoded challenge message */
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if(*chlg64 != '=') {
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result = Curl_base64_decode(chlg64, &chlg, &chlglen);
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if(result)
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return result;
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}
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/* Ensure we have a valid challenge message */
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if(!chlg) {
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infof(data, "SPNEGO handshake failure (empty challenge message)");
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return CURLE_BAD_CONTENT_ENCODING;
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}
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/* Setup the challenge "input" security buffer */
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input_token.value = chlg;
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input_token.length = chlglen;
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}
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/* Generate our challenge-response message */
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major_status = Curl_gss_init_sec_context(data,
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&minor_status,
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&nego->context,
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nego->spn,
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&Curl_spnego_mech_oid,
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GSS_C_NO_CHANNEL_BINDINGS,
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&input_token,
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&output_token,
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TRUE,
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NULL);
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/* Free the decoded challenge as it is not required anymore */
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Curl_safefree(input_token.value);
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nego->status = major_status;
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if(GSS_ERROR(major_status)) {
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if(output_token.value)
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gss_release_buffer(&unused_status, &output_token);
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Curl_gss_log_error(data, "gss_init_sec_context() failed: ",
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major_status, minor_status);
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return CURLE_AUTH_ERROR;
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}
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if(!output_token.value || !output_token.length) {
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if(output_token.value)
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gss_release_buffer(&unused_status, &output_token);
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return CURLE_AUTH_ERROR;
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}
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/* Free previous token */
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if(nego->output_token.length && nego->output_token.value)
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gss_release_buffer(&unused_status, &nego->output_token);
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nego->output_token = output_token;
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return CURLE_OK;
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}
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/*
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* Curl_auth_create_spnego_message()
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*
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* This is used to generate an already encoded SPNEGO (Negotiate) response
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* message ready for sending to the recipient.
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*
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* Parameters:
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*
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* data [in] - The session handle.
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* nego [in/out] - The Negotiate data struct being used and modified.
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* outptr [in/out] - The address where a pointer to newly allocated memory
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* holding the result will be stored upon completion.
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* outlen [out] - The length of the output message.
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*
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* Returns CURLE_OK on success.
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*/
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CURLcode Curl_auth_create_spnego_message(struct negotiatedata *nego,
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char **outptr, size_t *outlen)
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{
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CURLcode result;
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OM_uint32 minor_status;
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/* Base64 encode the already generated response */
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result = Curl_base64_encode(nego->output_token.value,
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nego->output_token.length,
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outptr, outlen);
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if(result) {
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gss_release_buffer(&minor_status, &nego->output_token);
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nego->output_token.value = NULL;
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nego->output_token.length = 0;
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return result;
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}
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if(!*outptr || !*outlen) {
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gss_release_buffer(&minor_status, &nego->output_token);
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nego->output_token.value = NULL;
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nego->output_token.length = 0;
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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return CURLE_OK;
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}
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/*
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* Curl_auth_cleanup_spnego()
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*
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* This is used to clean up the SPNEGO (Negotiate) specific data.
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*
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* Parameters:
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*
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* nego [in/out] - The Negotiate data struct being cleaned up.
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*
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*/
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void Curl_auth_cleanup_spnego(struct negotiatedata *nego)
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{
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OM_uint32 minor_status;
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/* Free our security context */
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if(nego->context != GSS_C_NO_CONTEXT) {
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gss_delete_sec_context(&minor_status, &nego->context, GSS_C_NO_BUFFER);
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nego->context = GSS_C_NO_CONTEXT;
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}
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/* Free the output token */
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if(nego->output_token.value) {
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gss_release_buffer(&minor_status, &nego->output_token);
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nego->output_token.value = NULL;
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nego->output_token.length = 0;
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}
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/* Free the SPN */
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if(nego->spn != GSS_C_NO_NAME) {
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gss_release_name(&minor_status, &nego->spn);
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nego->spn = GSS_C_NO_NAME;
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}
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/* Reset any variables */
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nego->status = 0;
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nego->noauthpersist = FALSE;
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nego->havenoauthpersist = FALSE;
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nego->havenegdata = FALSE;
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nego->havemultiplerequests = FALSE;
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}
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#endif /* HAVE_GSSAPI && USE_SPNEGO */
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