gnutls.c 36.4 KB
Newer Older
Ted Zlatanov's avatar
Ted Zlatanov committed
1
/* GnuTLS glue for GNU Emacs.
2
   Copyright (C) 2010-2011  Free Software Foundation, Inc.
Ted Zlatanov's avatar
Ted Zlatanov committed
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

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>
#include <errno.h>
#include <setjmp.h>

#include "lisp.h"
#include "process.h"

#ifdef HAVE_GNUTLS
#include <gnutls/gnutls.h>

29 30 31 32 33 34 35 36
#ifdef WINDOWSNT
#include <windows.h>
#include "w32.h"
#endif

static int
emacs_gnutls_handle_error (gnutls_session_t, int err);

37
static Lisp_Object Qgnutls_dll;
38 39 40
static Lisp_Object Qgnutls_code;
static Lisp_Object Qgnutls_anon, Qgnutls_x509pki;
static Lisp_Object Qgnutls_e_interrupted, Qgnutls_e_again,
Ted Zlatanov's avatar
Ted Zlatanov committed
41
  Qgnutls_e_invalid_session, Qgnutls_e_not_ready_for_handshake;
42
static int gnutls_global_initialized;
Ted Zlatanov's avatar
Ted Zlatanov committed
43

44
/* The following are for the property list of `gnutls-boot'.  */
45 46 47 48 49 50 51 52 53 54
static Lisp_Object QCgnutls_bootprop_priority;
static Lisp_Object QCgnutls_bootprop_trustfiles;
static Lisp_Object QCgnutls_bootprop_keylist;
static Lisp_Object QCgnutls_bootprop_crlfiles;
static Lisp_Object QCgnutls_bootprop_callbacks;
static Lisp_Object QCgnutls_bootprop_loglevel;
static Lisp_Object QCgnutls_bootprop_hostname;
static Lisp_Object QCgnutls_bootprop_min_prime_bits;
static Lisp_Object QCgnutls_bootprop_verify_flags;
static Lisp_Object QCgnutls_bootprop_verify_hostname_error;
55 56

/* Callback keys for `gnutls-boot'.  Unused currently.  */
57
static Lisp_Object QCgnutls_bootprop_callbacks_verify;
58

59 60 61 62 63 64 65
static void gnutls_log_function (int, const char *);
static void gnutls_log_function2 (int, const char*, const char*);


#ifdef WINDOWSNT

/* Macro for defining functions that will be loaded from the GnuTLS DLL.  */
66
#define DEF_GNUTLS_FN(rettype,func,args) static rettype (FAR CDECL *fn_##func)args
67 68 69 70 71 72 73 74

/* Macro for loading GnuTLS functions from the library.  */
#define LOAD_GNUTLS_FN(lib,func) {					\
    fn_##func = (void *) GetProcAddress (lib, #func);			\
    if (!fn_##func) return 0;						\
  }

DEF_GNUTLS_FN (gnutls_alert_description_t, gnutls_alert_get,
Andreas Schwab's avatar
Andreas Schwab committed
75
	       (gnutls_session_t));
76
DEF_GNUTLS_FN (const char *, gnutls_alert_get_name,
Andreas Schwab's avatar
Andreas Schwab committed
77
	       (gnutls_alert_description_t));
78 79
DEF_GNUTLS_FN (int, gnutls_alert_send_appropriate, (gnutls_session_t, int));
DEF_GNUTLS_FN (int, gnutls_anon_allocate_client_credentials,
Andreas Schwab's avatar
Andreas Schwab committed
80
	       (gnutls_anon_client_credentials_t *));
81
DEF_GNUTLS_FN (void, gnutls_anon_free_client_credentials,
Andreas Schwab's avatar
Andreas Schwab committed
82
	       (gnutls_anon_client_credentials_t));
83 84
DEF_GNUTLS_FN (int, gnutls_bye, (gnutls_session_t, gnutls_close_request_t));
DEF_GNUTLS_FN (int, gnutls_certificate_allocate_credentials,
Andreas Schwab's avatar
Andreas Schwab committed
85
	       (gnutls_certificate_credentials_t *));
86
DEF_GNUTLS_FN (void, gnutls_certificate_free_credentials,
Andreas Schwab's avatar
Andreas Schwab committed
87
	       (gnutls_certificate_credentials_t));
88
DEF_GNUTLS_FN (const gnutls_datum_t *, gnutls_certificate_get_peers,
Andreas Schwab's avatar
Andreas Schwab committed
89
	       (gnutls_session_t, unsigned int *));
90
DEF_GNUTLS_FN (void, gnutls_certificate_set_verify_flags,
Andreas Schwab's avatar
Andreas Schwab committed
91
	       (gnutls_certificate_credentials_t, unsigned int));
92
DEF_GNUTLS_FN (int, gnutls_certificate_set_x509_crl_file,
Andreas Schwab's avatar
Andreas Schwab committed
93 94
	       (gnutls_certificate_credentials_t, const char *,
		gnutls_x509_crt_fmt_t));
95
DEF_GNUTLS_FN (int, gnutls_certificate_set_x509_key_file,
Andreas Schwab's avatar
Andreas Schwab committed
96 97
	       (gnutls_certificate_credentials_t, const char *, const char *,
		gnutls_x509_crt_fmt_t));
98
DEF_GNUTLS_FN (int, gnutls_certificate_set_x509_trust_file,
Andreas Schwab's avatar
Andreas Schwab committed
99 100
	       (gnutls_certificate_credentials_t, const char *,
		gnutls_x509_crt_fmt_t));
101
DEF_GNUTLS_FN (gnutls_certificate_type_t, gnutls_certificate_type_get,
Andreas Schwab's avatar
Andreas Schwab committed
102
	       (gnutls_session_t));
103
DEF_GNUTLS_FN (int, gnutls_certificate_verify_peers2,
Andreas Schwab's avatar
Andreas Schwab committed
104
	       (gnutls_session_t, unsigned int *));
105
DEF_GNUTLS_FN (int, gnutls_credentials_set,
Andreas Schwab's avatar
Andreas Schwab committed
106
	       (gnutls_session_t, gnutls_credentials_type_t, void *));
107
DEF_GNUTLS_FN (void, gnutls_deinit, (gnutls_session_t));
108
DEF_GNUTLS_FN (void, gnutls_dh_set_prime_bits,
Andreas Schwab's avatar
Andreas Schwab committed
109
	       (gnutls_session_t, unsigned int));
110 111 112 113
DEF_GNUTLS_FN (int, gnutls_error_is_fatal, (int));
DEF_GNUTLS_FN (int, gnutls_global_init, (void));
DEF_GNUTLS_FN (void, gnutls_global_set_log_function, (gnutls_log_func));
DEF_GNUTLS_FN (void, gnutls_global_set_log_level, (int));
114 115 116 117
DEF_GNUTLS_FN (void, gnutls_global_set_mem_functions,
	       (gnutls_alloc_function, gnutls_alloc_function,
		gnutls_is_secure_function, gnutls_realloc_function,
		gnutls_free_function));
118 119 120
DEF_GNUTLS_FN (int, gnutls_handshake, (gnutls_session_t));
DEF_GNUTLS_FN (int, gnutls_init, (gnutls_session_t *, gnutls_connection_end_t));
DEF_GNUTLS_FN (int, gnutls_priority_set_direct,
Andreas Schwab's avatar
Andreas Schwab committed
121
	       (gnutls_session_t, const char *, const char **));
122 123 124
DEF_GNUTLS_FN (size_t, gnutls_record_check_pending, (gnutls_session_t));
DEF_GNUTLS_FN (ssize_t, gnutls_record_recv, (gnutls_session_t, void *, size_t));
DEF_GNUTLS_FN (ssize_t, gnutls_record_send,
Andreas Schwab's avatar
Andreas Schwab committed
125
	       (gnutls_session_t, const void *, size_t));
126 127 128 129
DEF_GNUTLS_FN (const char *, gnutls_strerror, (int));
DEF_GNUTLS_FN (void, gnutls_transport_set_errno, (gnutls_session_t, int));
DEF_GNUTLS_FN (void, gnutls_transport_set_lowat, (gnutls_session_t, int));
DEF_GNUTLS_FN (void, gnutls_transport_set_ptr2,
Andreas Schwab's avatar
Andreas Schwab committed
130 131
	       (gnutls_session_t, gnutls_transport_ptr_t,
		gnutls_transport_ptr_t));
132
DEF_GNUTLS_FN (void, gnutls_transport_set_pull_function,
Andreas Schwab's avatar
Andreas Schwab committed
133
	       (gnutls_session_t, gnutls_pull_func));
134
DEF_GNUTLS_FN (void, gnutls_transport_set_push_function,
Andreas Schwab's avatar
Andreas Schwab committed
135
	       (gnutls_session_t, gnutls_push_func));
136
DEF_GNUTLS_FN (int, gnutls_x509_crt_check_hostname,
Andreas Schwab's avatar
Andreas Schwab committed
137
	       (gnutls_x509_crt_t, const char *));
138 139
DEF_GNUTLS_FN (void, gnutls_x509_crt_deinit, (gnutls_x509_crt_t));
DEF_GNUTLS_FN (int, gnutls_x509_crt_import,
Andreas Schwab's avatar
Andreas Schwab committed
140 141
	       (gnutls_x509_crt_t, const gnutls_datum_t *,
		gnutls_x509_crt_fmt_t));
142 143 144 145 146 147
DEF_GNUTLS_FN (int, gnutls_x509_crt_init, (gnutls_x509_crt_t *));

static int
init_gnutls_functions (Lisp_Object libraries)
{
  HMODULE library;
148
  int max_log_level = 1;
149 150 151

  if (!(library = w32_delayed_load (libraries, Qgnutls_dll)))
    {
152
      GNUTLS_LOG (1, max_log_level, "GnuTLS library not found");
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
      return 0;
    }

  LOAD_GNUTLS_FN (library, gnutls_alert_get);
  LOAD_GNUTLS_FN (library, gnutls_alert_get_name);
  LOAD_GNUTLS_FN (library, gnutls_alert_send_appropriate);
  LOAD_GNUTLS_FN (library, gnutls_anon_allocate_client_credentials);
  LOAD_GNUTLS_FN (library, gnutls_anon_free_client_credentials);
  LOAD_GNUTLS_FN (library, gnutls_bye);
  LOAD_GNUTLS_FN (library, gnutls_certificate_allocate_credentials);
  LOAD_GNUTLS_FN (library, gnutls_certificate_free_credentials);
  LOAD_GNUTLS_FN (library, gnutls_certificate_get_peers);
  LOAD_GNUTLS_FN (library, gnutls_certificate_set_verify_flags);
  LOAD_GNUTLS_FN (library, gnutls_certificate_set_x509_crl_file);
  LOAD_GNUTLS_FN (library, gnutls_certificate_set_x509_key_file);
  LOAD_GNUTLS_FN (library, gnutls_certificate_set_x509_trust_file);
  LOAD_GNUTLS_FN (library, gnutls_certificate_type_get);
  LOAD_GNUTLS_FN (library, gnutls_certificate_verify_peers2);
  LOAD_GNUTLS_FN (library, gnutls_credentials_set);
  LOAD_GNUTLS_FN (library, gnutls_deinit);
173
  LOAD_GNUTLS_FN (library, gnutls_dh_set_prime_bits);
174 175 176 177
  LOAD_GNUTLS_FN (library, gnutls_error_is_fatal);
  LOAD_GNUTLS_FN (library, gnutls_global_init);
  LOAD_GNUTLS_FN (library, gnutls_global_set_log_function);
  LOAD_GNUTLS_FN (library, gnutls_global_set_log_level);
178
  LOAD_GNUTLS_FN (library, gnutls_global_set_mem_functions);
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
  LOAD_GNUTLS_FN (library, gnutls_handshake);
  LOAD_GNUTLS_FN (library, gnutls_init);
  LOAD_GNUTLS_FN (library, gnutls_priority_set_direct);
  LOAD_GNUTLS_FN (library, gnutls_record_check_pending);
  LOAD_GNUTLS_FN (library, gnutls_record_recv);
  LOAD_GNUTLS_FN (library, gnutls_record_send);
  LOAD_GNUTLS_FN (library, gnutls_strerror);
  LOAD_GNUTLS_FN (library, gnutls_transport_set_errno);
  LOAD_GNUTLS_FN (library, gnutls_transport_set_lowat);
  LOAD_GNUTLS_FN (library, gnutls_transport_set_ptr2);
  LOAD_GNUTLS_FN (library, gnutls_transport_set_pull_function);
  LOAD_GNUTLS_FN (library, gnutls_transport_set_push_function);
  LOAD_GNUTLS_FN (library, gnutls_x509_crt_check_hostname);
  LOAD_GNUTLS_FN (library, gnutls_x509_crt_deinit);
  LOAD_GNUTLS_FN (library, gnutls_x509_crt_import);
  LOAD_GNUTLS_FN (library, gnutls_x509_crt_init);

196
  max_log_level = global_gnutls_log_level;
197 198

  GNUTLS_LOG2 (1, max_log_level, "GnuTLS library loaded:",
Andreas Schwab's avatar
Andreas Schwab committed
199
	       SDATA (Fget (Qgnutls_dll, QCloaded_from)));
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
  return 1;
}

#else /* !WINDOWSNT */

#define fn_gnutls_alert_get			gnutls_alert_get
#define fn_gnutls_alert_get_name		gnutls_alert_get_name
#define fn_gnutls_alert_send_appropriate	gnutls_alert_send_appropriate
#define fn_gnutls_anon_allocate_client_credentials gnutls_anon_allocate_client_credentials
#define fn_gnutls_anon_free_client_credentials	gnutls_anon_free_client_credentials
#define fn_gnutls_bye				gnutls_bye
#define fn_gnutls_certificate_allocate_credentials gnutls_certificate_allocate_credentials
#define fn_gnutls_certificate_free_credentials	gnutls_certificate_free_credentials
#define fn_gnutls_certificate_get_peers		gnutls_certificate_get_peers
#define fn_gnutls_certificate_set_verify_flags	gnutls_certificate_set_verify_flags
#define fn_gnutls_certificate_set_x509_crl_file	gnutls_certificate_set_x509_crl_file
216
#define fn_gnutls_certificate_set_x509_key_file gnutls_certificate_set_x509_key_file
217
#define fn_gnutls_certificate_set_x509_trust_file gnutls_certificate_set_x509_trust_file
218 219 220 221
#define fn_gnutls_certificate_type_get		gnutls_certificate_type_get
#define fn_gnutls_certificate_verify_peers2	gnutls_certificate_verify_peers2
#define fn_gnutls_credentials_set		gnutls_credentials_set
#define fn_gnutls_deinit			gnutls_deinit
222
#define fn_gnutls_dh_set_prime_bits		gnutls_dh_set_prime_bits
223 224 225 226
#define fn_gnutls_error_is_fatal		gnutls_error_is_fatal
#define fn_gnutls_global_init			gnutls_global_init
#define fn_gnutls_global_set_log_function	gnutls_global_set_log_function
#define fn_gnutls_global_set_log_level		gnutls_global_set_log_level
227
#define fn_gnutls_global_set_mem_functions	gnutls_global_set_mem_functions
228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244
#define fn_gnutls_handshake			gnutls_handshake
#define fn_gnutls_init				gnutls_init
#define fn_gnutls_priority_set_direct		gnutls_priority_set_direct
#define fn_gnutls_record_check_pending		gnutls_record_check_pending
#define fn_gnutls_record_recv			gnutls_record_recv
#define fn_gnutls_record_send			gnutls_record_send
#define fn_gnutls_strerror			gnutls_strerror
#define fn_gnutls_transport_set_errno		gnutls_transport_set_errno
#define fn_gnutls_transport_set_ptr2		gnutls_transport_set_ptr2
#define fn_gnutls_x509_crt_check_hostname	gnutls_x509_crt_check_hostname
#define fn_gnutls_x509_crt_deinit		gnutls_x509_crt_deinit
#define fn_gnutls_x509_crt_import		gnutls_x509_crt_import
#define fn_gnutls_x509_crt_init			gnutls_x509_crt_init

#endif /* !WINDOWSNT */


245
static void
246 247 248 249 250 251 252 253 254 255 256 257
gnutls_log_function (int level, const char* string)
{
  message ("gnutls.c: [%d] %s", level, string);
}

static void
gnutls_log_function2 (int level, const char* string, const char* extra)
{
  message ("gnutls.c: [%d] %s %s", level, string, extra);
}

static int
258 259 260 261 262 263
emacs_gnutls_handshake (struct Lisp_Process *proc)
{
  gnutls_session_t state = proc->gnutls_state;
  int ret;

  if (proc->gnutls_initstage < GNUTLS_STAGE_HANDSHAKE_CANDO)
264
    return -1;
265 266

  if (proc->gnutls_initstage < GNUTLS_STAGE_TRANSPORT_POINTERS_SET)
267
    {
268 269
#ifdef WINDOWSNT
      /* On W32 we cannot transfer socket handles between different runtime
Andreas Schwab's avatar
Andreas Schwab committed
270 271
	 libraries, so we tell GnuTLS to use our special push/pull
	 functions.  */
272
      fn_gnutls_transport_set_ptr2 (state,
Andreas Schwab's avatar
Andreas Schwab committed
273 274
				    (gnutls_transport_ptr_t) proc,
				    (gnutls_transport_ptr_t) proc);
275 276
      fn_gnutls_transport_set_push_function (state, &emacs_gnutls_push);
      fn_gnutls_transport_set_pull_function (state, &emacs_gnutls_pull);
277 278

      /* For non blocking sockets or other custom made pull/push
Andreas Schwab's avatar
Andreas Schwab committed
279 280
	 functions the gnutls_transport_set_lowat must be called, with
	 a zero low water mark value. (GnuTLS 2.10.4 documentation)
281

Andreas Schwab's avatar
Andreas Schwab committed
282 283 284
	 (Note: this is probably not strictly necessary as the lowat
	  value is only used when no custom pull/push functions are
	  set.)  */
285
      fn_gnutls_transport_set_lowat (state, 0);
286
#else
287
      /* This is how GnuTLS takes sockets: as file descriptors passed
Andreas Schwab's avatar
Andreas Schwab committed
288 289
	 in.  For an Emacs process socket, infd and outfd are the
	 same but we use this two-argument version for clarity.  */
290
      fn_gnutls_transport_set_ptr2 (state,
Andreas Schwab's avatar
Andreas Schwab committed
291 292
				    (gnutls_transport_ptr_t) (long) proc->infd,
				    (gnutls_transport_ptr_t) (long) proc->outfd);
293
#endif
294

295 296
      proc->gnutls_initstage = GNUTLS_STAGE_TRANSPORT_POINTERS_SET;
    }
297

298 299
  do
    {
300
      ret = fn_gnutls_handshake (state);
301 302
      emacs_gnutls_handle_error (state, ret);
    }
303
  while (ret < 0 && fn_gnutls_error_is_fatal (ret) == 0);
304

305 306 307
  proc->gnutls_initstage = GNUTLS_STAGE_HANDSHAKE_TRIED;

  if (ret == GNUTLS_E_SUCCESS)
308
    {
309
      /* Here we're finally done.  */
310 311
      proc->gnutls_initstage = GNUTLS_STAGE_READY;
    }
312 313
  else
    {
314
      fn_gnutls_alert_send_appropriate (state, ret);
315 316
    }
  return ret;
317 318
}

319 320 321 322 323 324 325 326 327 328 329 330
int
emacs_gnutls_record_check_pending (gnutls_session_t state)
{
  return fn_gnutls_record_check_pending (state);
}

void
emacs_gnutls_transport_set_errno (gnutls_session_t state, int err)
{
  fn_gnutls_transport_set_errno (state, err);
}

331
EMACS_INT
332
emacs_gnutls_write (struct Lisp_Process *proc, const char *buf, EMACS_INT nbyte)
Ted Zlatanov's avatar
Ted Zlatanov committed
333
{
334
  ssize_t rtnval = 0;
335
  EMACS_INT bytes_written;
336 337
  gnutls_session_t state = proc->gnutls_state;

338 339 340 341 342 343 344
  if (proc->gnutls_initstage != GNUTLS_STAGE_READY) {
#ifdef EWOULDBLOCK
    errno = EWOULDBLOCK;
#endif
#ifdef EAGAIN
    errno = EAGAIN;
#endif
345
    return 0;
346
  }
Ted Zlatanov's avatar
Ted Zlatanov committed
347 348 349 350 351

  bytes_written = 0;

  while (nbyte > 0)
    {
352
      rtnval = fn_gnutls_record_send (state, buf, nbyte);
Ted Zlatanov's avatar
Ted Zlatanov committed
353

354
      if (rtnval < 0)
Andreas Schwab's avatar
Andreas Schwab committed
355 356 357 358 359 360
	{
	  if (rtnval == GNUTLS_E_AGAIN || rtnval == GNUTLS_E_INTERRUPTED)
	    continue;
	  else
	    break;
	}
Ted Zlatanov's avatar
Ted Zlatanov committed
361 362 363 364 365 366

      buf += rtnval;
      nbyte -= rtnval;
      bytes_written += rtnval;
    }

367
  emacs_gnutls_handle_error (state, rtnval);
Ted Zlatanov's avatar
Ted Zlatanov committed
368 369 370
  return (bytes_written);
}

371
EMACS_INT
372
emacs_gnutls_read (struct Lisp_Process *proc, char *buf, EMACS_INT nbyte)
Ted Zlatanov's avatar
Ted Zlatanov committed
373
{
374
  ssize_t rtnval;
375 376
  gnutls_session_t state = proc->gnutls_state;

377 378 379 380 381
  if (proc->gnutls_initstage != GNUTLS_STAGE_READY)
    {
      emacs_gnutls_handshake (proc);
      return -1;
    }
382
  rtnval = fn_gnutls_record_recv (state, buf, nbyte);
383 384
  if (rtnval >= 0)
    return rtnval;
385 386 387
  else if (rtnval == GNUTLS_E_UNEXPECTED_PACKET_LENGTH)
    /* The peer closed the connection. */
    return 0;
388 389 390
  else if (emacs_gnutls_handle_error (state, rtnval) == 0)
    /* non-fatal error */
    return -1;
391
  else {
Juanma Barranquero's avatar
Juanma Barranquero committed
392
    /* a fatal error occurred */
393
    return 0;
394
  }
Ted Zlatanov's avatar
Ted Zlatanov committed
395 396
}

397 398 399 400 401 402 403
/* report a GnuTLS error to the user.
   Returns zero if the error code was successfully handled. */
static int
emacs_gnutls_handle_error (gnutls_session_t session, int err)
{
  int max_log_level = 0;

404
  int ret;
405 406 407 408 409 410
  const char *str;

  /* TODO: use a Lisp_Object generated by gnutls_make_error?  */
  if (err >= 0)
    return 0;

411
  max_log_level = global_gnutls_log_level;
412 413 414

  /* TODO: use gnutls-error-fatalp and gnutls-error-string.  */

415
  str = fn_gnutls_strerror (err);
416 417 418
  if (!str)
    str = "unknown";

419
  if (fn_gnutls_error_is_fatal (err))
420 421 422 423 424 425 426 427 428 429 430 431 432 433
    {
      ret = err;
      GNUTLS_LOG2 (0, max_log_level, "fatal error:", str);
    }
  else
    {
      ret = 0;
      GNUTLS_LOG2 (1, max_log_level, "non-fatal error:", str);
      /* TODO: EAGAIN AKA Qgnutls_e_again should be level 2.  */
    }

  if (err == GNUTLS_E_WARNING_ALERT_RECEIVED
      || err == GNUTLS_E_FATAL_ALERT_RECEIVED)
    {
434
      int alert = fn_gnutls_alert_get (session);
435
      int level = (err == GNUTLS_E_FATAL_ALERT_RECEIVED) ? 0 : 1;
436
      str = fn_gnutls_alert_get_name (alert);
437 438 439 440 441 442 443 444
      if (!str)
	str = "unknown";

      GNUTLS_LOG2 (level, max_log_level, "Received alert: ", str);
    }
  return ret;
}

Ted Zlatanov's avatar
Ted Zlatanov committed
445 446 447 448
/* convert an integer error to a Lisp_Object; it will be either a
   known symbol like `gnutls_e_interrupted' and `gnutls_e_again' or
   simply the integer value of the error.  GNUTLS_E_SUCCESS is mapped
   to Qt.  */
449
static Lisp_Object
450
gnutls_make_error (int err)
Ted Zlatanov's avatar
Ted Zlatanov committed
451
{
452
  switch (err)
453 454 455 456 457 458 459 460 461 462
    {
    case GNUTLS_E_SUCCESS:
      return Qt;
    case GNUTLS_E_AGAIN:
      return Qgnutls_e_again;
    case GNUTLS_E_INTERRUPTED:
      return Qgnutls_e_interrupted;
    case GNUTLS_E_INVALID_SESSION:
      return Qgnutls_e_invalid_session;
    }
Ted Zlatanov's avatar
Ted Zlatanov committed
463

464
  return make_number (err);
Ted Zlatanov's avatar
Ted Zlatanov committed
465 466
}

467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
Lisp_Object
emacs_gnutls_deinit (Lisp_Object proc)
{
  int log_level;

  CHECK_PROCESS (proc);

  if (XPROCESS (proc)->gnutls_p == 0)
    return Qnil;

  log_level = XPROCESS (proc)->gnutls_log_level;

  if (XPROCESS (proc)->gnutls_x509_cred)
    {
      GNUTLS_LOG (2, log_level, "Deallocating x509 credentials");
      fn_gnutls_certificate_free_credentials (XPROCESS (proc)->gnutls_x509_cred);
      XPROCESS (proc)->gnutls_x509_cred = NULL;
    }

  if (XPROCESS (proc)->gnutls_anon_cred)
    {
      GNUTLS_LOG (2, log_level, "Deallocating anon credentials");
      fn_gnutls_anon_free_client_credentials (XPROCESS (proc)->gnutls_anon_cred);
      XPROCESS (proc)->gnutls_anon_cred = NULL;
    }

  if (GNUTLS_INITSTAGE (proc) >= GNUTLS_STAGE_INIT)
    {
      fn_gnutls_deinit (XPROCESS (proc)->gnutls_state);
      GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_INIT - 1;
    }

  XPROCESS (proc)->gnutls_p = 0;
  return Qt;
}

Ted Zlatanov's avatar
Ted Zlatanov committed
503
DEFUN ("gnutls-get-initstage", Fgnutls_get_initstage, Sgnutls_get_initstage, 1, 1, 0,
504
       doc: /* Return the GnuTLS init stage of process PROC.
Ted Zlatanov's avatar
Ted Zlatanov committed
505
See also `gnutls-boot'.  */)
506
  (Lisp_Object proc)
Ted Zlatanov's avatar
Ted Zlatanov committed
507 508 509 510 511 512 513
{
  CHECK_PROCESS (proc);

  return make_number (GNUTLS_INITSTAGE (proc));
}

DEFUN ("gnutls-errorp", Fgnutls_errorp, Sgnutls_errorp, 1, 1, 0,
514 515 516 517
       doc: /* Return t if ERROR indicates a GnuTLS problem.
ERROR is an integer or a symbol with an integer `gnutls-code' property.
usage: (gnutls-errorp ERROR)  */)
  (Lisp_Object err)
Ted Zlatanov's avatar
Ted Zlatanov committed
518
{
519
  if (EQ (err, Qt)) return Qnil;
Ted Zlatanov's avatar
Ted Zlatanov committed
520 521 522 523 524

  return Qt;
}

DEFUN ("gnutls-error-fatalp", Fgnutls_error_fatalp, Sgnutls_error_fatalp, 1, 1, 0,
525 526 527 528
       doc: /* Check if ERROR is fatal.
ERROR is an integer or a symbol with an integer `gnutls-code' property.
usage: (gnutls-error-fatalp ERROR)  */)
  (Lisp_Object err)
Ted Zlatanov's avatar
Ted Zlatanov committed
529 530 531 532 533 534 535
{
  Lisp_Object code;

  if (EQ (err, Qt)) return Qnil;

  if (SYMBOLP (err))
    {
536 537 538 539 540 541 542 543 544
      code = Fget (err, Qgnutls_code);
      if (NUMBERP (code))
	{
	  err = code;
	}
      else
	{
	  error ("Symbol has no numeric gnutls-code property");
	}
Ted Zlatanov's avatar
Ted Zlatanov committed
545 546 547 548 549
    }

  if (!NUMBERP (err))
    error ("Not an error symbol or code");

550
  if (0 == fn_gnutls_error_is_fatal (XINT (err)))
Ted Zlatanov's avatar
Ted Zlatanov committed
551 552 553 554 555 556
    return Qnil;

  return Qt;
}

DEFUN ("gnutls-error-string", Fgnutls_error_string, Sgnutls_error_string, 1, 1, 0,
557 558 559 560
       doc: /* Return a description of ERROR.
ERROR is an integer or a symbol with an integer `gnutls-code' property.
usage: (gnutls-error-string ERROR)  */)
  (Lisp_Object err)
Ted Zlatanov's avatar
Ted Zlatanov committed
561 562 563 564 565 566 567
{
  Lisp_Object code;

  if (EQ (err, Qt)) return build_string ("Not an error");

  if (SYMBOLP (err))
    {
568 569 570 571 572 573 574 575 576
      code = Fget (err, Qgnutls_code);
      if (NUMBERP (code))
	{
	  err = code;
	}
      else
	{
	  return build_string ("Symbol has no numeric gnutls-code property");
	}
Ted Zlatanov's avatar
Ted Zlatanov committed
577 578 579 580 581
    }

  if (!NUMBERP (err))
    return build_string ("Not an error symbol or code");

582
  return build_string (fn_gnutls_strerror (XINT (err)));
Ted Zlatanov's avatar
Ted Zlatanov committed
583 584 585
}

DEFUN ("gnutls-deinit", Fgnutls_deinit, Sgnutls_deinit, 1, 1, 0,
586
       doc: /* Deallocate GnuTLS resources associated with process PROC.
Ted Zlatanov's avatar
Ted Zlatanov committed
587
See also `gnutls-init'.  */)
588
  (Lisp_Object proc)
Ted Zlatanov's avatar
Ted Zlatanov committed
589
{
590
  return emacs_gnutls_deinit (proc);
Ted Zlatanov's avatar
Ted Zlatanov committed
591 592
}

593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613
DEFUN ("gnutls-available-p", Fgnutls_available_p, Sgnutls_available_p, 0, 0, 0,
       doc: /* Return t if GnuTLS is available in this instance of Emacs.  */)
     (void)
{
#ifdef WINDOWSNT
  Lisp_Object found = Fassq (Qgnutls_dll, Vlibrary_cache);
  if (CONSP (found))
    return XCDR (found);
  else
    {
      Lisp_Object status;
      status = init_gnutls_functions (Vdynamic_library_alist) ? Qt : Qnil;
      Vlibrary_cache = Fcons (Fcons (Qgnutls_dll, status), Vlibrary_cache);
      return status;
    }
#else
  return Qt;
#endif
}


614 615
/* Initializes global GnuTLS state to defaults.
Call `gnutls-global-deinit' when GnuTLS usage is no longer needed.
Ted Zlatanov's avatar
Ted Zlatanov committed
616
Returns zero on success.  */
617
static Lisp_Object
618
emacs_gnutls_global_init (void)
Ted Zlatanov's avatar
Ted Zlatanov committed
619 620 621
{
  int ret = GNUTLS_E_SUCCESS;

622
  if (!gnutls_global_initialized)
623 624 625 626 627
    {
      fn_gnutls_global_set_mem_functions (xmalloc, xmalloc, NULL,
					  xrealloc, xfree);
      ret = fn_gnutls_global_init ();
    }
628
  gnutls_global_initialized = 1;
Ted Zlatanov's avatar
Ted Zlatanov committed
629 630 631 632

  return gnutls_make_error (ret);
}

633
#if 0
634
/* Deinitializes global GnuTLS state.
Ted Zlatanov's avatar
Ted Zlatanov committed
635
See also `gnutls-global-init'.  */
636
static Lisp_Object
637
emacs_gnutls_global_deinit (void)
Ted Zlatanov's avatar
Ted Zlatanov committed
638
{
639
  if (gnutls_global_initialized)
Ted Zlatanov's avatar
Ted Zlatanov committed
640 641
    gnutls_global_deinit ();

642
  gnutls_global_initialized = 0;
Ted Zlatanov's avatar
Ted Zlatanov committed
643 644 645

  return gnutls_make_error (GNUTLS_E_SUCCESS);
}
646
#endif
Ted Zlatanov's avatar
Ted Zlatanov committed
647

648 649
DEFUN ("gnutls-boot", Fgnutls_boot, Sgnutls_boot, 3, 3, 0,
       doc: /* Initialize GnuTLS client for process PROC with TYPE+PROPLIST.
Ted Zlatanov's avatar
Ted Zlatanov committed
650 651 652
Currently only client mode is supported.  Returns a success/failure
value you can check with `gnutls-errorp'.

653 654 655
TYPE is a symbol, either `gnutls-anon' or `gnutls-x509pki'.
PROPLIST is a property list with the following keys:

656 657
:hostname is a string naming the remote host.

658
:priority is a GnuTLS priority string, defaults to "NORMAL".
659

660
:trustfiles is a list of PEM-encoded trust files for `gnutls-x509pki'.
661

662 663 664 665
:crlfiles is a list of PEM-encoded CRL lists for `gnutls-x509pki'.

:keylist is an alist of PEM-encoded key files and PEM-encoded
certificates for `gnutls-x509pki'.
666 667 668

:callbacks is an alist of callback functions, see below.

669
:loglevel is the debug level requested from GnuTLS, try 4.
670

671 672 673 674 675 676
:verify-flags is a bitset as per GnuTLS'
gnutls_certificate_set_verify_flags.

:verify-hostname-error, if non-nil, makes a hostname mismatch an
error.  Otherwise it will be just a warning.

677 678 679
:min-prime-bits is the minimum accepted number of bits the client will
accept in Diffie-Hellman key exchange.

680 681 682
The debug level will be set for this process AND globally for GnuTLS.
So if you set it higher or lower at any point, it affects global
debugging.
Ted Zlatanov's avatar
Ted Zlatanov committed
683 684 685 686 687

Note that the priority is set on the client.  The server does not use
the protocols's priority except for disabling protocols that were not
specified.

688
Processes must be initialized with this function before other GnuTLS
Ted Zlatanov's avatar
Ted Zlatanov committed
689 690 691
functions are used.  This function allocates resources which can only
be deallocated by calling `gnutls-deinit' or by calling it again.

692 693 694
The callbacks alist can have a `verify' key, associated with a
verification function (UNUSED).

Ted Zlatanov's avatar
Ted Zlatanov committed
695
Each authentication type may need additional information in order to
696 697 698
work.  For X.509 PKI (`gnutls-x509pki'), you probably need at least
one trustfile (usually a CA bundle).  */)
  (Lisp_Object proc, Lisp_Object type, Lisp_Object proplist)
Ted Zlatanov's avatar
Ted Zlatanov committed
699 700 701
{
  int ret = GNUTLS_E_SUCCESS;

702 703
  int max_log_level = 0;

Ted Zlatanov's avatar
Ted Zlatanov committed
704 705 706
  /* TODO: GNUTLS_X509_FMT_DER is also an option.  */
  int file_format = GNUTLS_X509_FMT_PEM;

707 708 709 710 711
  unsigned int gnutls_verify_flags = GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT;
  gnutls_x509_crt_t gnutls_verify_cert;
  unsigned int gnutls_verify_cert_list_size;
  const gnutls_datum_t *gnutls_verify_cert_list;

Ted Zlatanov's avatar
Ted Zlatanov committed
712 713 714 715
  gnutls_session_t state;
  gnutls_certificate_credentials_t x509_cred;
  gnutls_anon_client_credentials_t anon_cred;
  Lisp_Object global_init;
716
  char const *priority_string_ptr = "NORMAL"; /* default priority string.  */
717
  Lisp_Object tail;
718
  unsigned int peer_verification;
719
  char* c_hostname;
720 721 722 723

  /* Placeholders for the property list elements.  */
  Lisp_Object priority_string;
  Lisp_Object trustfiles;
724 725
  Lisp_Object crlfiles;
  Lisp_Object keylist;
726
  /* Lisp_Object callbacks; */
727
  Lisp_Object loglevel;
728 729
  Lisp_Object hostname;
  Lisp_Object verify_flags;
Paul Eggert's avatar
Paul Eggert committed
730
  /* Lisp_Object verify_error; */
731
  Lisp_Object verify_hostname_error;
732
  Lisp_Object prime_bits;
Ted Zlatanov's avatar
Ted Zlatanov committed
733 734 735

  CHECK_PROCESS (proc);
  CHECK_SYMBOL (type);
736 737
  CHECK_LIST (proplist);

738 739 740 741 742 743
  if (NILP (Fgnutls_available_p ()))
    {
      error ("GnuTLS not available");
      return gnutls_make_error (GNUTLS_EMACS_ERROR_NOT_LOADED);
    }

744 745 746 747 748 749 750 751 752 753 754
  hostname              = Fplist_get (proplist, QCgnutls_bootprop_hostname);
  priority_string       = Fplist_get (proplist, QCgnutls_bootprop_priority);
  trustfiles            = Fplist_get (proplist, QCgnutls_bootprop_trustfiles);
  keylist               = Fplist_get (proplist, QCgnutls_bootprop_keylist);
  crlfiles              = Fplist_get (proplist, QCgnutls_bootprop_crlfiles);
  /* callbacks          = Fplist_get (proplist, QCgnutls_bootprop_callbacks); */
  loglevel              = Fplist_get (proplist, QCgnutls_bootprop_loglevel);
  verify_flags          = Fplist_get (proplist, QCgnutls_bootprop_verify_flags);
  /* verify_error       = Fplist_get (proplist, QCgnutls_bootprop_verify_error); */
  verify_hostname_error = Fplist_get (proplist, QCgnutls_bootprop_verify_hostname_error);
  prime_bits            = Fplist_get (proplist, QCgnutls_bootprop_min_prime_bits);
755 756 757 758 759

  if (!STRINGP (hostname))
    error ("gnutls-boot: invalid :hostname parameter");

  c_hostname = SSDATA (hostname);
Ted Zlatanov's avatar
Ted Zlatanov committed
760

761 762
  if (NUMBERP (loglevel))
    {
763 764
      fn_gnutls_global_set_log_function (gnutls_log_function);
      fn_gnutls_global_set_log_level (XINT (loglevel));
765 766 767
      max_log_level = XINT (loglevel);
      XPROCESS (proc)->gnutls_log_level = max_log_level;
    }
768

Ted Zlatanov's avatar
Ted Zlatanov committed
769
  /* always initialize globals.  */
770
  global_init = emacs_gnutls_global_init ();
Ted Zlatanov's avatar
Ted Zlatanov committed
771 772 773
  if (! NILP (Fgnutls_errorp (global_init)))
    return global_init;

774 775 776
  /* Before allocating new credentials, deallocate any credentials
     that PROC might already have.  */
  emacs_gnutls_deinit (proc);
Ted Zlatanov's avatar
Ted Zlatanov committed
777

778 779 780 781
  /* Mark PROC as a GnuTLS process.  */
  XPROCESS (proc)->gnutls_p = 1;
  XPROCESS (proc)->gnutls_x509_cred = NULL;
  XPROCESS (proc)->gnutls_anon_cred = NULL;
Ted Zlatanov's avatar
Ted Zlatanov committed
782 783
  GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_EMPTY;

784
  GNUTLS_LOG (1, max_log_level, "allocating credentials");
Ted Zlatanov's avatar
Ted Zlatanov committed
785
  if (EQ (type, Qgnutls_x509pki))
786
    {
787 788
      GNUTLS_LOG (2, max_log_level, "allocating x509 credentials");
      x509_cred = XPROCESS (proc)->gnutls_x509_cred;
789
      fn_gnutls_certificate_allocate_credentials (&x509_cred);
790 791

      if (NUMBERP (verify_flags))
Andreas Schwab's avatar
Andreas Schwab committed
792 793 794 795
	{
	  gnutls_verify_flags = XINT (verify_flags);
	  GNUTLS_LOG (2, max_log_level, "setting verification flags");
	}
796
      else if (NILP (verify_flags))
Andreas Schwab's avatar
Andreas Schwab committed
797 798 799 800
	{
	  /* The default is already GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT.  */
	  GNUTLS_LOG (2, max_log_level, "using default verification flags");
	}
801
      else
Andreas Schwab's avatar
Andreas Schwab committed
802 803 804 805
	{
	  /* The default is already GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT.  */
	  GNUTLS_LOG (2, max_log_level, "ignoring invalid verify-flags");
	}
806
      fn_gnutls_certificate_set_verify_flags (x509_cred, gnutls_verify_flags);
807
    }
Ted Zlatanov's avatar
Ted Zlatanov committed
808
  else if (EQ (type, Qgnutls_anon))
809
    {
810 811
      GNUTLS_LOG (2, max_log_level, "allocating anon credentials");
      anon_cred = XPROCESS (proc)->gnutls_anon_cred;
812
      fn_gnutls_anon_allocate_client_credentials (&anon_cred);
813
    }
Ted Zlatanov's avatar
Ted Zlatanov committed
814
  else
815
    {
Ted Zlatanov's avatar
Ted Zlatanov committed
816 817
      error ("unknown credential type");
      ret = GNUTLS_EMACS_ERROR_INVALID_TYPE;
818
    }
Ted Zlatanov's avatar
Ted Zlatanov committed
819 820

  if (ret < GNUTLS_E_SUCCESS)
821
    return gnutls_make_error (ret);
Ted Zlatanov's avatar
Ted Zlatanov committed
822 823 824 825

  GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_CRED_ALLOC;

  if (EQ (type, Qgnutls_x509pki))
826
    {
827
      for (tail = trustfiles; !NILP (tail); tail = Fcdr (tail))
828
	{
829
	  Lisp_Object trustfile = Fcar (tail);
Andreas Schwab's avatar
Andreas Schwab committed
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847
	  if (STRINGP (trustfile))
	    {
	      GNUTLS_LOG2 (1, max_log_level, "setting the trustfile: ",
			   SSDATA (trustfile));
	      ret = fn_gnutls_certificate_set_x509_trust_file
		(x509_cred,
		 SSDATA (trustfile),
		 file_format);

	      if (ret < GNUTLS_E_SUCCESS)
		return gnutls_make_error (ret);
	    }
	  else
	    {
	      error ("Sorry, GnuTLS can't use non-string trustfile %s",
		     SDATA (trustfile));
	    }
	}
Ted Zlatanov's avatar
Ted Zlatanov committed
848

849
      for (tail = crlfiles; !NILP (tail); tail = Fcdr (tail))
850
	{
851
	  Lisp_Object crlfile = Fcar (tail);
Andreas Schwab's avatar
Andreas Schwab committed
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
	  if (STRINGP (crlfile))
	    {
	      GNUTLS_LOG2 (1, max_log_level, "setting the CRL file: ",
			   SSDATA (crlfile));
	      ret = fn_gnutls_certificate_set_x509_crl_file
		(x509_cred,
		 SSDATA (crlfile),
		 file_format);

	      if (ret < GNUTLS_E_SUCCESS)
		return gnutls_make_error (ret);
	    }
	  else
	    {
	      error ("Sorry, GnuTLS can't use non-string CRL file %s",
		     SDATA (crlfile));
	    }
	}
870 871 872 873 874

      for (tail = keylist; !NILP (tail); tail = Fcdr (tail))
	{
	  Lisp_Object keyfile = Fcar (Fcar (tail));
	  Lisp_Object certfile = Fcar (Fcdr (tail));
Andreas Schwab's avatar
Andreas Schwab committed
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899
	  if (STRINGP (keyfile) && STRINGP (certfile))
	    {
	      GNUTLS_LOG2 (1, max_log_level, "setting the client key file: ",
			   SSDATA (keyfile));
	      GNUTLS_LOG2 (1, max_log_level, "setting the client cert file: ",
			   SSDATA (certfile));
	      ret = fn_gnutls_certificate_set_x509_key_file
		(x509_cred,
		 SSDATA (certfile),
		 SSDATA (keyfile),
		 file_format);

	      if (ret < GNUTLS_E_SUCCESS)
		return gnutls_make_error (ret);
	    }
	  else
	    {
	      if (STRINGP (keyfile))
		error ("Sorry, GnuTLS can't use non-string client cert file %s",
		       SDATA (certfile));
	      else
		error ("Sorry, GnuTLS can't use non-string client key file %s",
		       SDATA (keyfile));
	    }
	}
900
    }
Ted Zlatanov's avatar
Ted Zlatanov committed
901 902 903

  GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_FILES;

904 905 906 907 908 909 910 911
  GNUTLS_LOG (1, max_log_level, "gnutls callbacks");

  GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_CALLBACKS;

#ifdef HAVE_GNUTLS_CALLBACK_CERTIFICATE_VERIFY
#else
#endif

912 913
  GNUTLS_LOG (1, max_log_level, "gnutls_init");

914
  ret = fn_gnutls_init (&state, GNUTLS_CLIENT);
Ted Zlatanov's avatar
Ted Zlatanov committed
915 916

  if (ret < GNUTLS_E_SUCCESS)
917
    return gnutls_make_error (ret);
Ted Zlatanov's avatar
Ted Zlatanov committed
918 919 920 921 922

  XPROCESS (proc)->gnutls_state = state;

  GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_INIT;

923 924
  if (STRINGP (priority_string))
    {
925
      priority_string_ptr = SSDATA (priority_string);
926
      GNUTLS_LOG2 (1, max_log_level, "got non-default priority string:",
Andreas Schwab's avatar
Andreas Schwab committed
927
		   priority_string_ptr);
928 929 930 931
    }
  else
    {
      GNUTLS_LOG2 (1, max_log_level, "using default priority string:",
Andreas Schwab's avatar
Andreas Schwab committed
932
		   priority_string_ptr);
933
    }
934

935 936
  GNUTLS_LOG (1, max_log_level, "setting the priority string");

937
  ret = fn_gnutls_priority_set_direct (state,
Andreas Schwab's avatar
Andreas Schwab committed
938 939
				       priority_string_ptr,
				       NULL);
Ted Zlatanov's avatar
Ted Zlatanov committed
940 941

  if (ret < GNUTLS_E_SUCCESS)
942
    return gnutls_make_error (ret);
Ted Zlatanov's avatar
Ted Zlatanov committed
943 944 945

  GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_PRIORITY;

946 947 948 949 950
  if (!EQ (prime_bits, Qnil))
    {
      fn_gnutls_dh_set_prime_bits (state, XUINT (prime_bits));
    }

Ted Zlatanov's avatar
Ted Zlatanov committed
951
  if (EQ (type, Qgnutls_x509pki))
952
    {
953
      ret = fn_gnutls_credentials_set (state, GNUTLS_CRD_CERTIFICATE, x509_cred);
954
    }
Ted Zlatanov's avatar
Ted Zlatanov committed
955
  else if (EQ (type, Qgnutls_anon))
956
    {
957
      ret = fn_gnutls_credentials_set (state, GNUTLS_CRD_ANON, anon_cred);
958
    }
Ted Zlatanov's avatar
Ted Zlatanov committed
959
  else
960
    {
Ted Zlatanov's avatar
Ted Zlatanov committed
961 962
      error ("unknown credential type");
      ret = GNUTLS_EMACS_ERROR_INVALID_TYPE;
963
    }
Ted Zlatanov's avatar
Ted Zlatanov committed
964 965

  if (ret < GNUTLS_E_SUCCESS)
966
    return gnutls_make_error (ret);
Ted Zlatanov's avatar
Ted Zlatanov committed
967

968 969
  XPROCESS (proc)->gnutls_anon_cred = anon_cred;
  XPROCESS (proc)->gnutls_x509_cred = x509_cred;
Ted Zlatanov's avatar
Ted Zlatanov committed
970 971 972 973
  XPROCESS (proc)->gnutls_cred_type = type;

  GNUTLS_INITSTAGE (proc) = GNUTLS_STAGE_CRED_SET;

974
  ret = emacs_gnutls_handshake (XPROCESS (proc));
975

976 977 978 979 980 981 982 983 984
  if (ret < GNUTLS_E_SUCCESS)
    return gnutls_make_error (ret);

  /* Now verify the peer, following
     http://www.gnu.org/software/gnutls/manual/html_node/Verifying-peer_0027s-certificate.html.
     The peer should present at least one certificate in the chain; do a
     check of the certificate's hostname with
     gnutls_x509_crt_check_hostname() against :hostname.  */

985
  ret = fn_gnutls_certificate_verify_peers2 (state, &peer_verification);
986 987 988

  if (ret < GNUTLS_E_SUCCESS)
    return gnutls_make_error (ret);
Paul Eggert's avatar
Paul Eggert committed
989

990
  if (XINT (loglevel) > 0 && peer_verification & GNUTLS_CERT_INVALID)
Paul Eggert's avatar
Paul Eggert committed
991
    message ("%s certificate could not be verified.",