| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, 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. |
| * |
| * RFC4178 Simple and Protected GSS-API Negotiation Mechanism |
| * |
| ***************************************************************************/ |
| |
| #include "curl_setup.h" |
| |
| #if defined(HAVE_GSSAPI) && defined(USE_SPNEGO) |
| |
| #include <curl/curl.h> |
| |
| #include "vauth/vauth.h" |
| #include "urldata.h" |
| #include "curl_base64.h" |
| #include "curl_gssapi.h" |
| #include "warnless.h" |
| #include "curl_multibyte.h" |
| #include "sendf.h" |
| |
| /* The last #include files should be: */ |
| #include "curl_memory.h" |
| #include "memdebug.h" |
| |
| /* |
| * Curl_auth_is_spnego_supported() |
| * |
| * This is used to evaluate if SPNEGO (Negotiate) is supported. |
| * |
| * Parameters: None |
| * |
| * Returns TRUE if Negotiate supported by the GSS-API library. |
| */ |
| bool Curl_auth_is_spnego_supported(void) |
| { |
| return TRUE; |
| } |
| |
| /* |
| * Curl_auth_decode_spnego_message() |
| * |
| * This is used to decode an already encoded SPNEGO (Negotiate) challenge |
| * message. |
| * |
| * Parameters: |
| * |
| * data [in] - The session handle. |
| * userp [in] - The user name in the format User or Domain\User. |
| * passwdp [in] - The user's password. |
| * service [in] - The service type such as http, smtp, pop or imap. |
| * host [in] - The host name. |
| * chlg64 [in] - The optional base64 encoded challenge message. |
| * nego [in/out] - The Negotiate data struct being used and modified. |
| * |
| * Returns CURLE_OK on success. |
| */ |
| CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data, |
| const char *user, |
| const char *password, |
| const char *service, |
| const char *host, |
| const char *chlg64, |
| struct negotiatedata *nego) |
| { |
| CURLcode result = CURLE_OK; |
| size_t chlglen = 0; |
| unsigned char *chlg = NULL; |
| OM_uint32 major_status; |
| OM_uint32 minor_status; |
| OM_uint32 unused_status; |
| gss_buffer_desc spn_token = GSS_C_EMPTY_BUFFER; |
| gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER; |
| gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER; |
| |
| (void) user; |
| (void) password; |
| |
| if(nego->context && nego->status == GSS_S_COMPLETE) { |
| /* We finished successfully our part of authentication, but server |
| * rejected it (since we're again here). Exit with an error since we |
| * can't invent anything better */ |
| Curl_auth_cleanup_spnego(nego); |
| return CURLE_LOGIN_DENIED; |
| } |
| |
| if(!nego->spn) { |
| /* Generate our SPN */ |
| char *spn = Curl_auth_build_spn(service, NULL, host); |
| if(!spn) |
| return CURLE_OUT_OF_MEMORY; |
| |
| /* Populate the SPN structure */ |
| spn_token.value = spn; |
| spn_token.length = strlen(spn); |
| |
| /* Import the SPN */ |
| major_status = gss_import_name(&minor_status, &spn_token, |
| GSS_C_NT_HOSTBASED_SERVICE, |
| &nego->spn); |
| if(GSS_ERROR(major_status)) { |
| Curl_gss_log_error(data, "gss_import_name() failed: ", |
| major_status, minor_status); |
| |
| free(spn); |
| |
| return CURLE_AUTH_ERROR; |
| } |
| |
| free(spn); |
| } |
| |
| if(chlg64 && *chlg64) { |
| /* Decode the base-64 encoded challenge message */ |
| if(*chlg64 != '=') { |
| result = Curl_base64_decode(chlg64, &chlg, &chlglen); |
| if(result) |
| return result; |
| } |
| |
| /* Ensure we have a valid challenge message */ |
| if(!chlg) { |
| infof(data, "SPNEGO handshake failure (empty challenge message)"); |
| return CURLE_BAD_CONTENT_ENCODING; |
| } |
| |
| /* Setup the challenge "input" security buffer */ |
| input_token.value = chlg; |
| input_token.length = chlglen; |
| } |
| |
| /* Generate our challenge-response message */ |
| major_status = Curl_gss_init_sec_context(data, |
| &minor_status, |
| &nego->context, |
| nego->spn, |
| &Curl_spnego_mech_oid, |
| GSS_C_NO_CHANNEL_BINDINGS, |
| &input_token, |
| &output_token, |
| TRUE, |
| NULL); |
| |
| /* Free the decoded challenge as it is not required anymore */ |
| Curl_safefree(input_token.value); |
| |
| nego->status = major_status; |
| if(GSS_ERROR(major_status)) { |
| if(output_token.value) |
| gss_release_buffer(&unused_status, &output_token); |
| |
| Curl_gss_log_error(data, "gss_init_sec_context() failed: ", |
| major_status, minor_status); |
| |
| return CURLE_AUTH_ERROR; |
| } |
| |
| if(!output_token.value || !output_token.length) { |
| if(output_token.value) |
| gss_release_buffer(&unused_status, &output_token); |
| |
| return CURLE_AUTH_ERROR; |
| } |
| |
| /* Free previous token */ |
| if(nego->output_token.length && nego->output_token.value) |
| gss_release_buffer(&unused_status, &nego->output_token); |
| |
| nego->output_token = output_token; |
| |
| return CURLE_OK; |
| } |
| |
| /* |
| * Curl_auth_create_spnego_message() |
| * |
| * This is used to generate an already encoded SPNEGO (Negotiate) response |
| * message ready for sending to the recipient. |
| * |
| * Parameters: |
| * |
| * data [in] - The session handle. |
| * nego [in/out] - The Negotiate data struct being used and modified. |
| * outptr [in/out] - The address where a pointer to newly allocated memory |
| * holding the result will be stored upon completion. |
| * outlen [out] - The length of the output message. |
| * |
| * Returns CURLE_OK on success. |
| */ |
| CURLcode Curl_auth_create_spnego_message(struct Curl_easy *data, |
| struct negotiatedata *nego, |
| char **outptr, size_t *outlen) |
| { |
| CURLcode result; |
| OM_uint32 minor_status; |
| |
| /* Base64 encode the already generated response */ |
| result = Curl_base64_encode(data, |
| nego->output_token.value, |
| nego->output_token.length, |
| outptr, outlen); |
| |
| if(result) { |
| gss_release_buffer(&minor_status, &nego->output_token); |
| nego->output_token.value = NULL; |
| nego->output_token.length = 0; |
| |
| return result; |
| } |
| |
| if(!*outptr || !*outlen) { |
| gss_release_buffer(&minor_status, &nego->output_token); |
| nego->output_token.value = NULL; |
| nego->output_token.length = 0; |
| |
| return CURLE_REMOTE_ACCESS_DENIED; |
| } |
| |
| return CURLE_OK; |
| } |
| |
| /* |
| * Curl_auth_cleanup_spnego() |
| * |
| * This is used to clean up the SPNEGO (Negotiate) specific data. |
| * |
| * Parameters: |
| * |
| * nego [in/out] - The Negotiate data struct being cleaned up. |
| * |
| */ |
| void Curl_auth_cleanup_spnego(struct negotiatedata *nego) |
| { |
| OM_uint32 minor_status; |
| |
| /* Free our security context */ |
| if(nego->context != GSS_C_NO_CONTEXT) { |
| gss_delete_sec_context(&minor_status, &nego->context, GSS_C_NO_BUFFER); |
| nego->context = GSS_C_NO_CONTEXT; |
| } |
| |
| /* Free the output token */ |
| if(nego->output_token.value) { |
| gss_release_buffer(&minor_status, &nego->output_token); |
| nego->output_token.value = NULL; |
| nego->output_token.length = 0; |
| |
| } |
| |
| /* Free the SPN */ |
| if(nego->spn != GSS_C_NO_NAME) { |
| gss_release_name(&minor_status, &nego->spn); |
| nego->spn = GSS_C_NO_NAME; |
| } |
| |
| /* Reset any variables */ |
| nego->status = 0; |
| nego->noauthpersist = FALSE; |
| nego->havenoauthpersist = FALSE; |
| nego->havenegdata = FALSE; |
| nego->havemultiplerequests = FALSE; |
| } |
| |
| #endif /* HAVE_GSSAPI && USE_SPNEGO */ |
