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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 2011 - 2018, Daniel Stenberg, <daniel (at) 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 += msnprintf(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 */
    137