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
30static char spnego_oid_bytes[] = "\x2b\x06\x01\x05\x05\x02";
31gss_OID_desc Curl_spnego_mech_oid = { 6, &spnego_oid_bytes };
32static char krb5_oid_bytes[] = "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02";
33gss_OID_desc Curl_krb5_mech_oid = { 9, &krb5_oid_bytes };
34
35OM_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
80static 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 */
117void 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 */
132