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8616e5aada
Fixes #19109 - GSSAPI authentication fails on macOS with Apple's Heimdal
implementation which lacks GSS_C_CHANNEL_BOUND_FLAG support for TLS
channel binding.
Commit 0a5ea09a91 introduced TLS channel binding for SPNEGO/GSSAPI
authentication unconditionally, but Apple's Heimdal fork (used on macOS)
does not support this feature, causing "unsupported mechanism" errors
when authenticating to corporate HTTP services with Kerberos.
Solution:
- Add CURL_GSSAPI_HAS_CHANNEL_BINDING detection in curl_gssapi.h based
on GSS_C_CHANNEL_BOUND_FLAG presence (MIT Kerberos >= 1.19)
- Make negotiatedata.channel_binding_data field conditional in vauth.h
- Guard channel binding collection/cleanup in http_negotiate.c
- Guard channel binding usage in spnego_gssapi.c
This follows the same pattern as GSS_C_DELEG_POLICY_FLAG detection and
ensures graceful degradation when channel binding is unavailable while
maintaining full support for implementations that have it.
Changes:
- lib/curl_gssapi.h: Add feature detection macro
- lib/vauth/vauth.h: Make struct field conditional
- lib/http_negotiate.c: Conditional init/cleanup (2 locations)
- lib/vauth/spnego_gssapi.c: Conditional channel binding usage
Tested on macOS with Apple Heimdal (no channel binding) and Linux with
MIT Kerberos (with channel binding). Both configurations authenticate
successfully without errors.
Closes #19164
66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
#ifndef HEADER_CURL_GSSAPI_H
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#define HEADER_CURL_GSSAPI_H
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/***************************************************************************
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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) 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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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include "urldata.h"
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#ifdef HAVE_GSSAPI
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#ifdef GSS_C_CHANNEL_BOUND_FLAG /* MIT Kerberos 1.19+, missing from GNU GSS */
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#define CURL_GSSAPI_HAS_CHANNEL_BINDING
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#endif
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extern gss_OID_desc Curl_spnego_mech_oid;
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extern gss_OID_desc Curl_krb5_mech_oid;
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/* Common method for using GSS-API */
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OM_uint32 Curl_gss_init_sec_context(struct Curl_easy *data,
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OM_uint32 *minor_status,
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gss_ctx_id_t *context,
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gss_name_t target_name,
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gss_OID mech_type,
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gss_channel_bindings_t input_chan_bindings,
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gss_buffer_t input_token,
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gss_buffer_t output_token,
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const bool mutual_auth,
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OM_uint32 *ret_flags);
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OM_uint32 Curl_gss_delete_sec_context(OM_uint32 *min,
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gss_ctx_id_t *context_handle,
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gss_buffer_t output_token);
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/* Helper to log a GSS-API error status */
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void Curl_gss_log_error(struct Curl_easy *data, const char *prefix,
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OM_uint32 major, OM_uint32 minor);
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/* Define our privacy and integrity protection values */
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#define GSSAUTH_P_NONE 1
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#define GSSAUTH_P_INTEGRITY 2
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#define GSSAUTH_P_PRIVACY 4
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#endif /* HAVE_GSSAPI */
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#endif /* HEADER_CURL_GSSAPI_H */
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