summaryrefslogtreecommitdiff
path: root/lib/http_negotiate.c
blob: ece40692bc029d2e1f24a929bfdaa4896dc41081 (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
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
/***************************************************************************
 *                                  _   _ ____  _     
 *  Project                     ___| | | |  _ \| |    
 *                             / __| | | | |_) | |    
 *                            | (__| |_| |  _ <| |___ 
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2004, 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.
 *
 * $Id$
 ***************************************************************************/
#include "setup.h"

#ifdef HAVE_GSSAPI
#ifdef HAVE_GSSMIT
#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
#endif

#ifndef CURL_DISABLE_HTTP
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>

#include "urldata.h"
#include "sendf.h"
#include "strequal.h"
#include "base64.h"
#include "http_negotiate.h"
#include "memory.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, gss_name_t *server)
{
  struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
  OM_uint32 major_status, minor_status;
  gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
  char name[2048];
  const char* service;

  /* GSSAPI implementation by Globus (known as GSI) requires the name to be
     of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
     of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
     Change following lines if you want to use GSI */

  /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */
  
  if (neg_ctx->gss) 
    service = "khttp";
  else
    service = "http";

  token.length = strlen(service) + 1 + strlen(conn->host.name) + 1;
  if (token.length + 1 > sizeof(name))
    return EMSGSIZE;
  sprintf(name, "%s@%s", service, 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, 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) {
      sprintf(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, buf);
}

int Curl_input_negotiate(struct connectdata *conn, char *header)
{ 
  struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
  OM_uint32 major_status, minor_status, minor_status2;
  gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
  gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
  int ret;
  size_t len;
  bool gss;
  const char* protocol;

  while(*header && isspace((int)*header))
    header++;
  if(checkprefix("GSS-Negotiate", header)) {
    protocol = "GSS-Negotiate";
    gss = TRUE;
  }
  else if (checkprefix("Negotiate", header)) {
    protocol = "Negotiate";
    gss = FALSE;
  }
  else
    return -1;

  if (neg_ctx->context) {
    if (neg_ctx->gss != gss) {
      return -1;
    }
  }
  else {
    neg_ctx->protocol = protocol;
    neg_ctx->gss = gss;
  }
    
  if (neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
    /* We finished succesfully 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(conn->data);
    return -1;
  }

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

  header += strlen(neg_ctx->protocol);
  while(*header && isspace((int)*header))
    header++;

  len = strlen(header);
  if (len > 0) {
    int rawlen;
    input_token.length = (len+3)/4 * 3;
    input_token.value = malloc(input_token.length);
    if (input_token.value == NULL)
      return ENOMEM;
    rawlen = Curl_base64_decode(header, input_token.value);
    if (rawlen < 0)
      return -1;
    input_token.length = rawlen;

#ifdef HAVE_SPNEGO /* Handle SPNEGO */
    if (checkprefix("Negotiate", header)) {
        ASN1_OBJECT *   object            = NULL;
        int             rc                = 1;
        unsigned char * spnegoToken       = NULL;
        size_t          spnegoTokenLength = 0;
        unsigned char * mechToken         = NULL;
        size_t          mechTokenLength   = 0;

        spnegoToken = malloc(input_token.length);
        if (input_token.value == NULL)
          return ENOMEM;
        spnegoTokenLength = input_token.length;

        object = OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
        if (!parseSpnegoTargetToken(spnegoToken,
                                    spnegoTokenLength,
                                    NULL,
                                    NULL,
                                    &mechToken,
                                    &mechTokenLength,
                                    NULL,
                                    NULL)) {
          free(spnegoToken);
          spnegoToken = NULL;
          infof(conn->data, "Parse SPNEGO Target Token failed\n");
        }
        else {
          free(input_token.value);
          input_token.value = NULL;
          input_token.value = malloc(mechTokenLength);
          memcpy(input_token.value, mechToken,mechTokenLength);
          input_token.length = mechTokenLength;
          free(mechToken);
          mechToken = NULL;
          infof(conn->data, "Parse SPNEGO Target Token succeded\n");
        }
    }
#endif
  }

  major_status = gss_init_sec_context(&minor_status,
                                      GSS_C_NO_CREDENTIAL,
                                      &neg_ctx->context,
                                      neg_ctx->server_name,
                                      GSS_C_NO_OID,
                                      GSS_C_DELEG_FLAG,
                                      0,
                                      GSS_C_NO_CHANNEL_BINDINGS,
                                      &input_token,
                                      NULL,
                                      &output_token,
                                      NULL,
                                      NULL);
  if (input_token.length > 0)
    gss_release_buffer(&minor_status2, &input_token);
  neg_ctx->status = major_status;
  if (GSS_ERROR(major_status)) {
    /* Curl_cleanup_negotiate(conn->data) ??? */
    log_gss_error(conn, minor_status,
                  (char *)"gss_init_sec_context() failed: ");
    return -1;
  }

  if (output_token.length == 0) {
    return -1;
  }

  neg_ctx->output_token = output_token;
  /* conn->bits.close = FALSE; */

  return 0;
}
   

CURLcode Curl_output_negotiate(struct connectdata *conn)
{ 
  struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
  OM_uint32 minor_status;
  char *encoded = NULL;
  int len;

#ifdef HAVE_SPNEGO /* Handle SPNEGO */
  if (checkprefix("Negotiate",neg_ctx->protocol)) {
    ASN1_OBJECT *   object            = NULL;
    int             rc                = 1;
    unsigned char * spnegoToken       = NULL;
    size_t          spnegoTokenLength = 0;
    unsigned char * responseToken       = NULL;
    size_t          responseTokenLength = 0;
    
    responseToken = malloc(neg_ctx->output_token.length);
    if ( responseToken == NULL)
      return CURLE_OUT_OF_MEMORY;
    memcpy(responseToken, neg_ctx->output_token.value,
           neg_ctx->output_token.length);
    responseTokenLength = neg_ctx->output_token.length;

    object=OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
    if (!makeSpnegoInitialToken (object,
                                 responseToken,
                                 responseTokenLength,
                                 &spnegoToken,
                                 &spnegoTokenLength)) {
      free(responseToken);
      responseToken = NULL;
      infof(conn->data, "Make SPNEGO Initial Token failed\n");
    }
    else {
      free(neg_ctx->output_token.value);
      responseToken = NULL;
      neg_ctx->output_token.value = malloc(spnegoTokenLength);
      memcpy(neg_ctx->output_token.value, spnegoToken,spnegoTokenLength);
      neg_ctx->output_token.length = spnegoTokenLength;
      free(spnegoToken);
      spnegoToken = NULL;
      infof(conn->data, "Make SPNEGO Initial Token succeded\n");
    }
  }
#endif
  len = Curl_base64_encode(neg_ctx->output_token.value,
                           neg_ctx->output_token.length,
                           &encoded);

  if (len < 0)
    return CURLE_OUT_OF_MEMORY;

  conn->allocptr.userpwd =
    aprintf("Authorization: %s %s\r\n", neg_ctx->protocol, encoded);
  free(encoded);
  gss_release_buffer(&minor_status, &neg_ctx->output_token);
  return (conn->allocptr.userpwd == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
}

void Curl_cleanup_negotiate(struct SessionHandle *data)
{ 
  OM_uint32 minor_status;
  struct negotiatedata *neg_ctx = &data->state.negotiate;

  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.length != 0)
    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));
}


#endif
#endif