lib/curl_gssapi.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 2011 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at https://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ***************************************************************************/
  22
  23 #include "curl_setup.h"
  24
  25 #ifdef HAVE_GSSAPI
  26
  27 #include "curl_gssapi.h"
  28 #include "sendf.h"
  29
  30 static char spnego_oid_bytes[] = "\x2b\x06\x01\x05\x05\x02";
  31 gss_OID_desc Curl_spnego_mech_oid = { 6, &spnego_oid_bytes };
  32 static char krb5_oid_bytes[] = "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02";
  33 gss_OID_desc Curl_krb5_mech_oid = { 9, &krb5_oid_bytes };
  34
  35 OM_uint32 Curl_gss_init_sec_context(
  36     struct Curl_easy *data,
  37     OM_uint32 *minor_status,
  38     gss_ctx_id_t *context,
  39     gss_name_t target_name,
  40     gss_OID mech_type,
  41     gss_channel_bindings_t input_chan_bindings,
  42     gss_buffer_t input_token,
  43     gss_buffer_t output_token,
  44     const bool mutual_auth,
  45     OM_uint32 *ret_flags)
  46 {
  47   OM_uint32 req_flags = GSS_C_REPLAY_FLAG;
  48
  49   if(mutual_auth)
  50     req_flags |= GSS_C_MUTUAL_FLAG;
  51
  52   if(data->set.gssapi_delegation & CURLGSSAPI_DELEGATION_POLICY_FLAG) {
  53 #ifdef GSS_C_DELEG_POLICY_FLAG
  54     req_flags |= GSS_C_DELEG_POLICY_FLAG;
  55 #else
  56     infof(data, "warning: support for CURLGSSAPI_DELEGATION_POLICY_FLAG not "
  57         "compiled in\n");
  58 #endif
  59   }
  60
  61   if(data->set.gssapi_delegation & CURLGSSAPI_DELEGATION_FLAG)
  62     req_flags |= GSS_C_DELEG_FLAG;
  63
  64   return gss_init_sec_context(minor_status,
  65                               GSS_C_NO_CREDENTIAL, /* cred_handle */
  66                               context,
  67                               target_name,
  68                               mech_type,
  69                               req_flags,
  70                               0, /* time_req */
  71                               input_chan_bindings,
  72                               input_token,
  73                               NULL, /* actual_mech_type */
  74                               output_token,
  75                               ret_flags,
  76                               NULL /* time_rec */);
  77 }
  78
  79 #define GSS_LOG_BUFFER_LEN 1024
  80 static size_t display_gss_error(OM_uint32 status, int type,
  81                                 char *buf, size_t len) {
  82   OM_uint32 maj_stat;
  83   OM_uint32 min_stat;
  84   OM_uint32 msg_ctx = 0;
  85   gss_buffer_desc status_string;
  86
  87   do {
  88     maj_stat = gss_display_status(&min_stat,
  89                                   status,
  90                                   type,
  91                                   GSS_C_NO_OID,
  92                                   &msg_ctx,
  93                                   &status_string);
  94     if(GSS_LOG_BUFFER_LEN > len + status_string.length + 3) {
  95       len += snprintf(buf + len, GSS_LOG_BUFFER_LEN - len,
  96                       "%.*s. ", (int)status_string.length,
  97                       (char*)status_string.value);
  98     }
  99     gss_release_buffer(&min_stat, &status_string);
 100   } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);
 101
 102   return len;
 103 }
 104
 105 /*
 106  * Curl_gss_log_error()
 107  *
 108  * This is used to log a GSS-API error status.
 109  *
 110  * Parameters:
 111  *
 112  * data    [in] - The session handle.
 113  * prefix  [in] - The prefix of the log message.
 114  * major   [in] - The major status code.
 115  * minor   [in] - The minor status code.
 116  */
 117 void Curl_gss_log_error(struct Curl_easy *data, const char *prefix,
 118                         OM_uint32 major, OM_uint32 minor)
 119 {
 120   char buf[GSS_LOG_BUFFER_LEN];
 121   size_t len = 0;
 122
 123   if(major != GSS_S_FAILURE)
 124     len = display_gss_error(major, GSS_C_GSS_CODE, buf, len);
 125
 126   display_gss_error(minor, GSS_C_MECH_CODE, buf, len);
 127
 128   infof(data, "%s%s\n", prefix, buf);
 129 }
 130
 131 #endif /* HAVE_GSSAPI */