aboutsummaryrefslogtreecommitdiff
path: root/lib/http_negotiate.c
blob: f5e9252ebb5f5cde336e0000dd72f3a32d71eefd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/

#include "curl_setup.h"

#ifdef HAVE_GSSAPI
#ifdef HAVE_OLD_GSSMIT
#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
#define NCOMPAT 1
#endif

#ifndef CURL_DISABLE_HTTP

#include "urldata.h"
#include "sendf.h"
#include "curl_gssapi.h"
#include "rawstr.h"
#include "curl_base64.h"
#include "http_negotiate.h"
#include "curl_memory.h"
#include "url.h"

#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>

/* The last #include file should be: */
#include "memdebug.h"

static int
get_gss_name(struct connectdata *conn, bool proxy, gss_name_t *server)
{
  struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
    &conn->data->state.negotiate;
  OM_uint32 major_status, minor_status;
  gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
  char name[2048];
  const char* service = "HTTP";

  token.length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
                                              conn->host.name) + 1;
  if(token.length + 1 > sizeof(name))
    return EMSGSIZE;

  snprintf(name, sizeof(name), "%s@%s", service, proxy ? conn->proxy.name :
           conn->host.name);

  token.value = (void *) name;
  major_status = gss_import_name(&minor_status,
                                 &token,
                                 GSS_C_NT_HOSTBASED_SERVICE,
                                 server);

  return GSS_ERROR(major_status) ? -1 : 0;
}

static void
log_gss_error(struct connectdata *conn, OM_uint32 error_status,
              const char *prefix)
{
  OM_uint32 maj_stat, min_stat;
  OM_uint32 msg_ctx = 0;
  gss_buffer_desc status_string;
  char buf[1024];
  size_t len;

  snprintf(buf, sizeof(buf), "%s", prefix);
  len = strlen(buf);
  do {
    maj_stat = gss_display_status(&min_stat,
                                  error_status,
                                  GSS_C_MECH_CODE,
                                  GSS_C_NO_OID,
                                  &msg_ctx,
                                  &status_string);
      if(sizeof(buf) > len + status_string.length + 1) {
        snprintf(buf + len, sizeof(buf) - len,
                 ": %s", (char*) status_string.value);
      len += status_string.length;
    }
    gss_release_buffer(&min_stat, &status_string);
  } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);

  infof(conn->data, "%s\n", buf);
}

/* returning zero (0) means success, everything else is treated as "failure"
   with no care exactly what the failure was */
int Curl_input_negotiate(struct connectdata *conn, bool proxy,
                         const char *header)
{
  struct SessionHandle *data = conn->data;
  struct negotiatedata *neg_ctx = proxy?&data->state.proxyneg:
    &data->state.negotiate;
  OM_uint32 major_status, minor_status, discard_st;
  gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
  gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
  int ret;
  size_t len;
  size_t rawlen = 0;
  CURLcode error;

  if(neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
    /* We finished successfully our part of authentication, but server
     * rejected it (since we're again here). Exit with an error since we
     * can't invent anything better */
    Curl_cleanup_negotiate(data);
    return -1;
  }

  if(neg_ctx->server_name == NULL &&
      (ret = get_gss_name(conn, proxy, &neg_ctx->server_name)))
    return ret;

  header += strlen("Negotiate");
  while(*header && ISSPACE(*header))
    header++;

  len = strlen(header);
  if(len > 0) {
    error = Curl_base64_decode(header,
                               (unsigned char **)&input_token.value, &rawlen);
    if(error || rawlen == 0)
      return -1;
    input_token.length = rawlen;

    DEBUGASSERT(input_token.value != NULL);
  }

  major_status = Curl_gss_init_sec_context(data,
                                           &minor_status,
                                           &neg_ctx->context,
                                           neg_ctx->server_name,
                                           SPNEGO_MECHANISM,
                                           GSS_C_NO_CHANNEL_BINDINGS,
                                           &input_token,
                                           &output_token,
                                           NULL);
  Curl_safefree(input_token.value);

  neg_ctx->status = major_status;
  if(GSS_ERROR(major_status)) {
    if(output_token.value)
      gss_release_buffer(&discard_st, &output_token);
    log_gss_error(conn, minor_status, "gss_init_sec_context() failed: ");
    return -1;
  }

  if(!output_token.value || !output_token.length) {
    if(output_token.value)
      gss_release_buffer(&discard_st, &output_token);
    return -1;
  }

  neg_ctx->output_token = output_token;
  return 0;
}


CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
{
  struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
    &conn->data->state.negotiate;
  char *encoded = NULL;
  size_t len = 0;
  char *userp;
  CURLcode error;
  OM_uint32 discard_st;

  error = Curl_base64_encode(conn->data,
                             neg_ctx->output_token.value,
                             neg_ctx->output_token.length,
                             &encoded, &len);
  if(error) {
    gss_release_buffer(&discard_st, &neg_ctx->output_token);
    neg_ctx->output_token.value = NULL;
    neg_ctx->output_token.length = 0;
    return error;
  }

  if(!encoded || !len) {
    gss_release_buffer(&discard_st, &neg_ctx->output_token);
    neg_ctx->output_token.value = NULL;
    neg_ctx->output_token.length = 0;
    return CURLE_REMOTE_ACCESS_DENIED;
  }

  userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
                  encoded);
  if(proxy) {
    Curl_safefree(conn->allocptr.proxyuserpwd);
    conn->allocptr.proxyuserpwd = userp;
  }
  else {
    Curl_safefree(conn->allocptr.userpwd);
    conn->allocptr.userpwd = userp;
  }

  Curl_safefree(encoded);

  return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
}

static void cleanup(struct negotiatedata *neg_ctx)
{
  OM_uint32 minor_status;
  if(neg_ctx->context != GSS_C_NO_CONTEXT)
    gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);

  if(neg_ctx->output_token.value)
    gss_release_buffer(&minor_status, &neg_ctx->output_token);

  if(neg_ctx->server_name != GSS_C_NO_NAME)
    gss_release_name(&minor_status, &neg_ctx->server_name);

  memset(neg_ctx, 0, sizeof(*neg_ctx));
}

void Curl_cleanup_negotiate(struct SessionHandle *data)
{
  cleanup(&data->state.negotiate);
  cleanup(&data->state.proxyneg);
}


#endif
#endif