lib/curl_gssapi.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 2011 - 2018, 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 /* The last 3 #include files should be in this order */
  31 #include "curl_printf.h"
  32 #include "curl_memory.h"
  33 #include "memdebug.h"
  34
  35 static char spnego_oid_bytes[] = "\x2b\x06\x01\x05\x05\x02";
  36 gss_OID_desc Curl_spnego_mech_oid = { 6, &spnego_oid_bytes };
  37 static char krb5_oid_bytes[] = "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02";
  38 gss_OID_desc Curl_krb5_mech_oid = { 9, &krb5_oid_bytes };
  39
  40 OM_uint32 Curl_gss_init_sec_context(
  41     struct Curl_easy *data,
  42     OM_uint32 *minor_status,
  43     gss_ctx_id_t *context,
  44     gss_name_t target_name,
  45     gss_OID mech_type,
  46     gss_channel_bindings_t input_chan_bindings,
  47     gss_buffer_t input_token,
  48     gss_buffer_t output_token,
  49     const bool mutual_auth,
  50     OM_uint32 *ret_flags)
  51 {
  52   OM_uint32 req_flags = GSS_C_REPLAY_FLAG;
  53
  54   if(mutual_auth)
  55     req_flags |= GSS_C_MUTUAL_FLAG;
  56
  57   if(data->set.gssapi_delegation & CURLGSSAPI_DELEGATION_POLICY_FLAG) {
  58 #ifdef GSS_C_DELEG_POLICY_FLAG
  59     req_flags |= GSS_C_DELEG_POLICY_FLAG;
  60 #else
  61     infof(data, "warning: support for CURLGSSAPI_DELEGATION_POLICY_FLAG not "
  62         "compiled in\n");
  63 #endif
  64   }
  65
  66   if(data->set.gssapi_delegation & CURLGSSAPI_DELEGATION_FLAG)
  67     req_flags |= GSS_C_DELEG_FLAG;
  68
  69   return gss_init_sec_context(minor_status,
  70                               GSS_C_NO_CREDENTIAL, /* cred_handle */
  71                               context,
  72                               target_name,
  73                               mech_type,
  74                               req_flags,
  75                               0, /* time_req */
  76                               input_chan_bindings,
  77                               input_token,
  78                               NULL, /* actual_mech_type */
  79                               output_token,
  80                               ret_flags,
  81                               NULL /* time_rec */);
  82 }
  83
  84 #define GSS_LOG_BUFFER_LEN 1024
  85 static size_t display_gss_error(OM_uint32 status, int type,
  86                                 char *buf, size_t len) {
  87   OM_uint32 maj_stat;
  88   OM_uint32 min_stat;
  89   OM_uint32 msg_ctx = 0;
  90   gss_buffer_desc status_string;
  91
  92   do {
  93     maj_stat = gss_display_status(&min_stat,
  94                                   status,
  95                                   type,
  96                                   GSS_C_NO_OID,
  97                                   &msg_ctx,
  98                                   &status_string);
  99     if(GSS_LOG_BUFFER_LEN > len + status_string.length + 3) {
 100       len += snprintf(buf + len, GSS_LOG_BUFFER_LEN - len,
 101                       "%.*s. ", (int)status_string.length,
 102                       (char *)status_string.value);
 103     }
 104     gss_release_buffer(&min_stat, &status_string);
 105   } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);
 106
 107   return len;
 108 }
 109
 110 /*
 111  * Curl_gss_log_error()
 112  *
 113  * This is used to log a GSS-API error status.
 114  *
 115  * Parameters:
 116  *
 117  * data    [in] - The session handle.
 118  * prefix  [in] - The prefix of the log message.
 119  * major   [in] - The major status code.
 120  * minor   [in] - The minor status code.
 121  */
 122 void Curl_gss_log_error(struct Curl_easy *data, const char *prefix,
 123                         OM_uint32 major, OM_uint32 minor)
 124 {
 125   char buf[GSS_LOG_BUFFER_LEN];
 126   size_t len = 0;
 127
 128   if(major != GSS_S_FAILURE)
 129     len = display_gss_error(major, GSS_C_GSS_CODE, buf, len);
 130
 131   display_gss_error(minor, GSS_C_MECH_CODE, buf, len);
 132
 133   infof(data, "%s%s\n", prefix, buf);
 134 }
 135
 136 #endif /* HAVE_GSSAPI */