1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, 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#include "setup.h"
23
24#ifdef HAVE_GSSAPI
25#ifdef HAVE_OLD_GSSMIT
26#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
27#endif
28
29#ifndef CURL_DISABLE_HTTP
30 /* -- WIN32 approved -- */
31#include <stdio.h>
32#include <string.h>
33#include <stdarg.h>
34#include <stdlib.h>
35#include <ctype.h>
36
37#include "urldata.h"
38#include "sendf.h"
39#include "rawstr.h"
40#include "curl_base64.h"
41#include "http_negotiate.h"
42#include "curl_memory.h"
43
44#ifdef HAVE_SPNEGO
45#  include <spnegohelp.h>
46#  ifdef USE_SSLEAY
47#    ifdef USE_OPENSSL
48#      include <openssl/objects.h>
49#    else
50#      include <objects.h>
51#    endif
52#  else
53#    error "Can't compile SPNEGO support without OpenSSL."
54#  endif
55#endif
56
57#define _MPRINTF_REPLACE /* use our functions only */
58#include <curl/mprintf.h>
59
60/* The last #include file should be: */
61#include "memdebug.h"
62
63static int
64get_gss_name(struct connectdata *conn, bool proxy, gss_name_t *server)
65{
66  struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
67    &conn->data->state.negotiate;
68  OM_uint32 major_status, minor_status;
69  gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
70  char name[2048];
71  const char* service;
72
73  /* GSSAPI implementation by Globus (known as GSI) requires the name to be
74     of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
75     of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
76     Change following lines if you want to use GSI */
77
78  /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */
79
80  if(neg_ctx->gss)
81    service = "KHTTP";
82  else
83    service = "HTTP";
84
85  token.length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
86                                              conn->host.name) + 1;
87  if(token.length + 1 > sizeof(name))
88    return EMSGSIZE;
89
90  snprintf(name, sizeof(name), "%s@%s", service, proxy ? conn->proxy.name :
91           conn->host.name);
92
93  token.value = (void *) name;
94  major_status = gss_import_name(&minor_status,
95                                 &token,
96                                 GSS_C_NT_HOSTBASED_SERVICE,
97                                 server);
98
99  return GSS_ERROR(major_status) ? -1 : 0;
100}
101
102static void
103log_gss_error(struct connectdata *conn, OM_uint32 error_status,
104              const char *prefix)
105{
106  OM_uint32 maj_stat, min_stat;
107  OM_uint32 msg_ctx = 0;
108  gss_buffer_desc status_string;
109  char buf[1024];
110  size_t len;
111
112  snprintf(buf, sizeof(buf), "%s", prefix);
113  len = strlen(buf);
114  do {
115    maj_stat = gss_display_status(&min_stat,
116                                  error_status,
117                                  GSS_C_MECH_CODE,
118                                  GSS_C_NO_OID,
119                                  &msg_ctx,
120                                  &status_string);
121      if(sizeof(buf) > len + status_string.length + 1) {
122        snprintf(buf + len, sizeof(buf) - len,
123                 ": %s", (char*) status_string.value);
124      len += status_string.length;
125    }
126    gss_release_buffer(&min_stat, &status_string);
127  } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);
128
129  infof(conn->data, "%s", buf);
130}
131
132/* returning zero (0) means success, everything else is treated as "failure"
133   with no care exactly what the failure was */
134int Curl_input_negotiate(struct connectdata *conn, bool proxy,
135                         const char *header)
136{
137  struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
138    &conn->data->state.negotiate;
139  OM_uint32 major_status, minor_status, minor_status2;
140  gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
141  gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
142  int ret;
143  size_t len, rawlen;
144  bool gss;
145  const char* protocol;
146
147  while(*header && ISSPACE(*header))
148    header++;
149  if(checkprefix("GSS-Negotiate", header)) {
150    protocol = "GSS-Negotiate";
151    gss = TRUE;
152  }
153  else if(checkprefix("Negotiate", header)) {
154    protocol = "Negotiate";
155    gss = FALSE;
156  }
157  else
158    return -1;
159
160  if(neg_ctx->context) {
161    if(neg_ctx->gss != gss) {
162      return -1;
163    }
164  }
165  else {
166    neg_ctx->protocol = protocol;
167    neg_ctx->gss = gss;
168  }
169
170  if(neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
171    /* We finished successfully our part of authentication, but server
172     * rejected it (since we're again here). Exit with an error since we
173     * can't invent anything better */
174    Curl_cleanup_negotiate(conn->data);
175    return -1;
176  }
177
178  if(neg_ctx->server_name == NULL &&
179      (ret = get_gss_name(conn, proxy, &neg_ctx->server_name)))
180    return ret;
181
182  header += strlen(neg_ctx->protocol);
183  while(*header && ISSPACE(*header))
184    header++;
185
186  len = strlen(header);
187  if(len > 0) {
188    rawlen = Curl_base64_decode(header,
189                                (unsigned char **)&input_token.value);
190    if(rawlen == 0)
191      return -1;
192    input_token.length = rawlen;
193
194#ifdef HAVE_SPNEGO /* Handle SPNEGO */
195    if(checkprefix("Negotiate", header)) {
196      ASN1_OBJECT *   object            = NULL;
197      int             rc                = 1;
198      unsigned char * spnegoToken       = NULL;
199      size_t          spnegoTokenLength = 0;
200      unsigned char * mechToken         = NULL;
201      size_t          mechTokenLength   = 0;
202
203      if(input_token.value == NULL)
204        return CURLE_OUT_OF_MEMORY;
205
206      spnegoToken = malloc(input_token.length);
207      if(spnegoToken == NULL)
208        return CURLE_OUT_OF_MEMORY;
209
210      spnegoTokenLength = input_token.length;
211
212      object = OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
213      if(!parseSpnegoTargetToken(spnegoToken,
214                                 spnegoTokenLength,
215                                 NULL,
216                                 NULL,
217                                 &mechToken,
218                                 &mechTokenLength,
219                                 NULL,
220                                 NULL)) {
221        free(spnegoToken);
222        spnegoToken = NULL;
223        infof(conn->data, "Parse SPNEGO Target Token failed\n");
224      }
225      else {
226        free(input_token.value);
227        input_token.value = malloc(mechTokenLength);
228        if(input_token.value == NULL)
229          return CURLE_OUT_OF_MEMORY;
230
231        memcpy(input_token.value, mechToken,mechTokenLength);
232        input_token.length = mechTokenLength;
233        free(mechToken);
234        mechToken = NULL;
235        infof(conn->data, "Parse SPNEGO Target Token succeeded\n");
236      }
237    }
238#endif
239  }
240
241  major_status = gss_init_sec_context(&minor_status,
242                                      GSS_C_NO_CREDENTIAL,
243                                      &neg_ctx->context,
244                                      neg_ctx->server_name,
245                                      GSS_C_NO_OID,
246                                      0,
247                                      0,
248                                      GSS_C_NO_CHANNEL_BINDINGS,
249                                      &input_token,
250                                      NULL,
251                                      &output_token,
252                                      NULL,
253                                      NULL);
254  if(input_token.length > 0)
255    gss_release_buffer(&minor_status2, &input_token);
256  neg_ctx->status = major_status;
257  if(GSS_ERROR(major_status)) {
258    /* Curl_cleanup_negotiate(conn->data) ??? */
259    log_gss_error(conn, minor_status,
260                  "gss_init_sec_context() failed: ");
261    return -1;
262  }
263
264  if(output_token.length == 0) {
265    return -1;
266  }
267
268  neg_ctx->output_token = output_token;
269  /* conn->bits.close = FALSE; */
270
271  return 0;
272}
273
274
275CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
276{
277  struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
278    &conn->data->state.negotiate;
279  char *encoded = NULL;
280  size_t len;
281  char *userp;
282
283#ifdef HAVE_SPNEGO /* Handle SPNEGO */
284  if(checkprefix("Negotiate", neg_ctx->protocol)) {
285    ASN1_OBJECT *   object            = NULL;
286    int             rc                = 1;
287    unsigned char * spnegoToken       = NULL;
288    size_t          spnegoTokenLength = 0;
289    unsigned char * responseToken       = NULL;
290    size_t          responseTokenLength = 0;
291
292    responseToken = malloc(neg_ctx->output_token.length);
293    if(responseToken == NULL)
294      return CURLE_OUT_OF_MEMORY;
295    memcpy(responseToken, neg_ctx->output_token.value,
296           neg_ctx->output_token.length);
297    responseTokenLength = neg_ctx->output_token.length;
298
299    object=OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
300    if(!makeSpnegoInitialToken (object,
301                                 responseToken,
302                                 responseTokenLength,
303                                 &spnegoToken,
304                                 &spnegoTokenLength)) {
305      free(responseToken);
306      responseToken = NULL;
307      infof(conn->data, "Make SPNEGO Initial Token failed\n");
308    }
309    else {
310      free(responseToken);
311      responseToken = NULL;
312      free(neg_ctx->output_token.value);
313      neg_ctx->output_token.value = malloc(spnegoTokenLength);
314      if(neg_ctx->output_token.value == NULL) {
315        free(spnegoToken);
316        spnegoToken = NULL;
317        return CURLE_OUT_OF_MEMORY;
318      }
319      memcpy(neg_ctx->output_token.value, spnegoToken,spnegoTokenLength);
320      neg_ctx->output_token.length = spnegoTokenLength;
321      free(spnegoToken);
322      spnegoToken = NULL;
323      infof(conn->data, "Make SPNEGO Initial Token succeeded\n");
324    }
325  }
326#endif
327  len = Curl_base64_encode(conn->data,
328                           neg_ctx->output_token.value,
329                           neg_ctx->output_token.length,
330                           &encoded);
331
332  if(len == 0)
333    return CURLE_OUT_OF_MEMORY;
334
335  userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
336                  neg_ctx->protocol, encoded);
337
338  if(proxy)
339    conn->allocptr.proxyuserpwd = userp;
340  else
341    conn->allocptr.userpwd = userp;
342  free(encoded);
343  Curl_cleanup_negotiate (conn->data);
344  return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
345}
346
347static void cleanup(struct negotiatedata *neg_ctx)
348{
349  OM_uint32 minor_status;
350  if(neg_ctx->context != GSS_C_NO_CONTEXT)
351    gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
352
353  if(neg_ctx->output_token.length != 0)
354    gss_release_buffer(&minor_status, &neg_ctx->output_token);
355
356  if(neg_ctx->server_name != GSS_C_NO_NAME)
357    gss_release_name(&minor_status, &neg_ctx->server_name);
358
359  memset(neg_ctx, 0, sizeof(*neg_ctx));
360}
361
362void Curl_cleanup_negotiate(struct SessionHandle *data)
363{
364  cleanup(&data->state.negotiate);
365  cleanup(&data->state.proxyneg);
366}
367
368
369#endif
370#endif
371