summaryrefslogtreecommitdiff
path: root/auth/gsasl.c
blob: 244c0f09540ea2e00ef955413c9d7ff44de66827 (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
/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 2003, 2004 Free Software Foundation, Inc.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA  */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#ifdef WITH_GSASL

#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <mailutils/argp.h>
#include <mailutils/error.h>
#include <mailutils/errno.h>
#include <mailutils/mu_auth.h>
#include <mailutils/nls.h>
#include <mailutils/stream.h>

#include <gsasl.h>
#include <lbuf.h>

char *gsasl_cram_md5_pwd = SITE_CRAM_MD5_PWD;

#define ARG_CRAM_PASSWD 1

static struct argp_option _gsasl_argp_options[] = {
  {NULL, 0, NULL, 0, N_("GSASL options"), 0},
  {"cram-passwd", ARG_CRAM_PASSWD, N_("FILE"), 0,
   N_("Specify password file for CRAM-MD5 authentication"), 0},
  { NULL,      0, NULL, 0, NULL, 0 }
};

static error_t
_gsasl_argp_parser (int key, char *arg, struct argp_state *state)
{
  switch (key)
    {
    case ARG_CRAM_PASSWD:
      gsasl_cram_md5_pwd = arg;
      break;

    default:
      return ARGP_ERR_UNKNOWN;
    }
  return 0;
}

static struct argp _gsasl_argp = {
  _gsasl_argp_options,
  _gsasl_argp_parser
};

static struct argp_child _gsasl_argp_child = {
  &_gsasl_argp,
  0,
  NULL,
  0
};

void
mu_gsasl_init_argp ()
{
  if (mu_register_capa ("gsasl", &_gsasl_argp_child))
    {
      mu_error (_("INTERNAL ERROR: cannot register argp capability gsasl"));
      abort ();
    }
}


struct _gsasl_stream {
  Gsasl_session_ctx *sess_ctx; /* Context */
  int last_err;        /* Last Gsasl error code */
  
  stream_t stream;     /* I/O stream */
  struct _line_buffer *lb; 
};

static void
_gsasl_destroy (stream_t stream)
{
  int flags;
  struct _gsasl_stream *s = stream_get_owner (stream);
  stream_get_flags (stream, &flags);
  if (!(flags & MU_STREAM_NO_CLOSE))
    stream_destroy (&s->stream, stream_get_owner (s->stream));
  _auth_lb_destroy (&s->lb);
}

static int
_gsasl_readline (stream_t stream, char *optr, size_t osize,
		 off_t offset, size_t *nbytes)
{
  struct _gsasl_stream *s = stream_get_owner (stream);
  int rc;
  size_t len, sz;
  char *bufp = NULL;
  
  if (_auth_lb_level (s->lb))
    {
      len = _auth_lb_readline (s->lb, optr, osize-1);
      optr[len] = 0;
      if (nbytes)
	*nbytes = len;
      return 0;
    }

  do
    {
      char buf[80];
      size_t sz;
      int status;
      
      status = stream_sequential_read (s->stream, buf, sizeof (buf), &sz);
      if (status == EINTR)
	continue;
      else if (status)
	{
	  free (bufp);
	  return status;
	}
      rc = _auth_lb_grow (s->lb, buf, sz);
      if (rc)
	return rc;

      rc = gsasl_decode (s->sess_ctx,
			 _auth_lb_data (s->lb),
			 _auth_lb_level (s->lb),
			 &bufp, &len);
    }
  while (rc == GSASL_NEEDS_MORE);

  if (rc != GSASL_OK)
    {
      s->last_err = rc;
      free (bufp);
      return EIO;
    }
      
  sz = len > osize ? osize : len;
  
  if (len > osize)
    {
      memcpy (optr, bufp, osize);
      _auth_lb_drop (s->lb);
      _auth_lb_grow (s->lb, bufp + osize, len - osize);
      len = osize;
    }
  else
    {
      _auth_lb_drop (s->lb);
      memcpy (optr, bufp, len);
    }

  if (len < osize)
    optr[len] = 0;
  
  if (nbytes)
    *nbytes = len;
  
  free (bufp);

  return 0;
}

int
write_chunk (void *data, char *start, char *end)
{
  struct _gsasl_stream *s = data;
  size_t chunk_size = end - start + 1;
  size_t len = 0;
  char *buf = NULL;
  int status;
    
  gsasl_encode (s->sess_ctx, start, chunk_size, &buf, &len);

  status = stream_sequential_write (s->stream, buf, len);
  
  free (buf);

  return status;
}


static int
_gsasl_write (stream_t stream, const char *iptr, size_t isize,
	      off_t offset, size_t *nbytes)
{
  int rc;
  struct _gsasl_stream *s = stream_get_owner (stream);
  
  rc = _auth_lb_grow (s->lb, iptr, isize);
  if (rc)
    return rc;

  return _auth_lb_writelines (s->lb, iptr, isize, offset,
			      write_chunk, s, nbytes);      
}

static int
_gsasl_flush (stream_t stream)
{
  struct _gsasl_stream *s = stream_get_owner (stream);
  return stream_flush (s->stream);
}

static int
_gsasl_close (stream_t stream)
{
  int flags;
  struct _gsasl_stream *s = stream_get_owner (stream);

  stream_get_flags (stream, &flags);
  if (!(flags & MU_STREAM_NO_CLOSE))
    stream_close (s->stream);
  return 0;
}

static int
_gsasl_open (stream_t stream)
{
  /* Nothing to do */
  return 0;
}

int
_gsasl_strerror (stream_t stream, const char **pstr)
{
  struct _gsasl_stream *s = stream_get_owner (stream);
  *pstr = gsasl_strerror (s->last_err);
  return 0;
}

int
_gsasl_get_transport2 (stream_t stream, mu_transport_t *pt, mu_transport_t *pt2)
{
  struct _gsasl_stream *s = stream_get_owner (stream);
  *pt2 = NULL; /* FIXME 1 */
  *pt = (mu_transport_t) s->stream;
  return 0;
}

int
_gsasl_wait (stream_t stream, int *pflags, struct timeval *tvp)
{
  int flags;
  struct _gsasl_stream *s = stream_get_owner (stream);

  stream_get_flags (stream, &flags);
  if (((*pflags & MU_STREAM_READY_RD) && !(flags & MU_STREAM_READ))
      || ((*pflags & MU_STREAM_READY_WR) && !(flags & MU_STREAM_WRITE)))
    return EINVAL; 
  return stream_wait (s->stream, pflags, tvp);
}

int
gsasl_stream_create (stream_t *stream, stream_t transport,
		     Gsasl_session_ctx *ctx, int flags)
{
  struct _gsasl_stream *s;
  int rc;
    
  if (stream == NULL)
    return MU_ERR_OUT_PTR_NULL;

  if ((flags & ~(MU_STREAM_READ|MU_STREAM_WRITE))
      || (flags & (MU_STREAM_READ|MU_STREAM_WRITE)) ==
          (MU_STREAM_READ|MU_STREAM_WRITE))
    return EINVAL;
  
  s = calloc (1, sizeof (*s));
  if (s == NULL)
    return ENOMEM;

  s->stream = transport;
  s->sess_ctx = ctx;
  
  rc = stream_create (stream, flags|MU_STREAM_NO_CHECK, s);
  if (rc)
    {
      free (s);
      return rc;
    }

  stream_set_open (*stream, _gsasl_open, s);
  stream_set_close (*stream, _gsasl_close, s);
  stream_set_flush (*stream, _gsasl_flush, s);
  stream_set_destroy (*stream, _gsasl_destroy, s);
  stream_set_strerror (*stream, _gsasl_strerror, s);
  stream_set_wait (*stream, _gsasl_wait, s);
  stream_set_get_transport2 (*stream, _gsasl_get_transport2, s);
  if (flags & MU_STREAM_READ)
    stream_set_readline (*stream, _gsasl_readline, s);
  else
    stream_set_write (*stream, _gsasl_write, s);

  _auth_lb_create (&s->lb);
  
  return 0;
}
  
#endif

Return to:

Send suggestions and report system problems to the System administrator.