1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2015, 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 http://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#if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
26
27#include "urldata.h"
28#include "sendf.h"
29#include "curl_gssapi.h"
30#include "rawstr.h"
31#include "curl_base64.h"
32#include "http_negotiate.h"
33#include "curl_sasl.h"
34#include "url.h"
35#include "curl_printf.h"
36
37/* The last #include files should be: */
38#include "curl_memory.h"
39#include "memdebug.h"
40
41CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
42                              const char *header)
43{
44  struct SessionHandle *data = conn->data;
45  struct negotiatedata *neg_ctx = proxy?&data->state.proxyneg:
46    &data->state.negotiate;
47  OM_uint32 major_status, minor_status, discard_st;
48  gss_buffer_desc spn_token = GSS_C_EMPTY_BUFFER;
49  gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
50  gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
51  size_t len;
52  size_t rawlen = 0;
53  CURLcode result;
54
55  if(neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
56    /* We finished successfully our part of authentication, but server
57     * rejected it (since we're again here). Exit with an error since we
58     * can't invent anything better */
59    Curl_cleanup_negotiate(data);
60    return CURLE_LOGIN_DENIED;
61  }
62
63  if(!neg_ctx->server_name) {
64    /* Generate our SPN */
65    char *spn = Curl_sasl_build_gssapi_spn(
66      proxy ? data->set.str[STRING_PROXY_SERVICE_NAME] :
67      data->set.str[STRING_SERVICE_NAME],
68      proxy ? conn->proxy.name : conn->host.name);
69    if(!spn)
70      return CURLE_OUT_OF_MEMORY;
71
72    /* Populate the SPN structure */
73    spn_token.value = spn;
74    spn_token.length = strlen(spn);
75
76    /* Import the SPN */
77    major_status = gss_import_name(&minor_status, &spn_token,
78                                   GSS_C_NT_HOSTBASED_SERVICE,
79                                   &neg_ctx->server_name);
80    if(GSS_ERROR(major_status)) {
81      Curl_gss_log_error(data, minor_status, "gss_import_name() failed: ");
82
83      free(spn);
84
85      return CURLE_OUT_OF_MEMORY;
86    }
87
88    free(spn);
89  }
90
91  header += strlen("Negotiate");
92  while(*header && ISSPACE(*header))
93    header++;
94
95  len = strlen(header);
96  if(len > 0) {
97    result = Curl_base64_decode(header, (unsigned char **)&input_token.value,
98                                &rawlen);
99    if(result)
100      return result;
101
102    if(!rawlen) {
103      infof(data, "Negotiate handshake failure (empty challenge message)\n");
104
105      return CURLE_BAD_CONTENT_ENCODING;
106    }
107
108    input_token.length = rawlen;
109
110    DEBUGASSERT(input_token.value != NULL);
111  }
112
113  major_status = Curl_gss_init_sec_context(data,
114                                           &minor_status,
115                                           &neg_ctx->context,
116                                           neg_ctx->server_name,
117                                           &Curl_spnego_mech_oid,
118                                           GSS_C_NO_CHANNEL_BINDINGS,
119                                           &input_token,
120                                           &output_token,
121                                           TRUE,
122                                           NULL);
123  Curl_safefree(input_token.value);
124
125  neg_ctx->status = major_status;
126  if(GSS_ERROR(major_status)) {
127    if(output_token.value)
128      gss_release_buffer(&discard_st, &output_token);
129    Curl_gss_log_error(conn->data, minor_status,
130                       "gss_init_sec_context() failed: ");
131    return CURLE_OUT_OF_MEMORY;
132  }
133
134  if(!output_token.value || !output_token.length) {
135    if(output_token.value)
136      gss_release_buffer(&discard_st, &output_token);
137    return CURLE_OUT_OF_MEMORY;
138  }
139
140  neg_ctx->output_token = output_token;
141
142  return CURLE_OK;
143}
144
145CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
146{
147  struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
148    &conn->data->state.negotiate;
149  char *encoded = NULL;
150  size_t len = 0;
151  char *userp;
152  CURLcode result;
153  OM_uint32 discard_st;
154
155  result = Curl_base64_encode(conn->data,
156                              neg_ctx->output_token.value,
157                              neg_ctx->output_token.length,
158                              &encoded, &len);
159  if(result) {
160    gss_release_buffer(&discard_st, &neg_ctx->output_token);
161    neg_ctx->output_token.value = NULL;
162    neg_ctx->output_token.length = 0;
163    return result;
164  }
165
166  if(!encoded || !len) {
167    gss_release_buffer(&discard_st, &neg_ctx->output_token);
168    neg_ctx->output_token.value = NULL;
169    neg_ctx->output_token.length = 0;
170    return CURLE_REMOTE_ACCESS_DENIED;
171  }
172
173  userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
174                  encoded);
175  if(proxy) {
176    Curl_safefree(conn->allocptr.proxyuserpwd);
177    conn->allocptr.proxyuserpwd = userp;
178  }
179  else {
180    Curl_safefree(conn->allocptr.userpwd);
181    conn->allocptr.userpwd = userp;
182  }
183
184  free(encoded);
185
186  return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
187}
188
189static void cleanup(struct negotiatedata *neg_ctx)
190{
191  OM_uint32 minor_status;
192  if(neg_ctx->context != GSS_C_NO_CONTEXT)
193    gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
194
195  if(neg_ctx->output_token.value)
196    gss_release_buffer(&minor_status, &neg_ctx->output_token);
197
198  if(neg_ctx->server_name != GSS_C_NO_NAME)
199    gss_release_name(&minor_status, &neg_ctx->server_name);
200
201  memset(neg_ctx, 0, sizeof(*neg_ctx));
202}
203
204void Curl_cleanup_negotiate(struct SessionHandle *data)
205{
206  cleanup(&data->state.negotiate);
207  cleanup(&data->state.proxyneg);
208}
209
210#endif /* HAVE_GSSAPI && !CURL_DISABLE_HTTP && USE_SPNEGO */
211