summaryrefslogtreecommitdiff
path: root/auth/pam.c
blob: 1411c5c16e53d3b29b4ce62b99758cf15cfd36ef (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
/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 2002 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., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301 USA */

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

#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#ifdef HAVE_SHADOW_H
# include <shadow.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_SECURITY_PAM_APPL_H
# include <security/pam_appl.h>
#endif
#ifdef HAVE_CRYPT_H
# include <crypt.h>
#endif

#include <mailutils/list.h>
#include <mailutils/iterator.h>
#include <mailutils/mailbox.h>
#include <mailutils/argp.h>
#include <mailutils/mu_auth.h>
#include <mailutils/nls.h>

char *pam_service = NULL;

#ifdef USE_LIBPAM
#define COPY_STRING(s) (s) ? strdup(s) : NULL

static char *_pwd;
static char *_user;
static int _perr = 0;

static int
mu_pam_conv (int num_msg, const struct pam_message **msg,
	     struct pam_response **resp, void *appdata_ptr ARG_UNUSED)
{
  int replies = 0;
  struct pam_response *reply = NULL;

  reply = malloc (sizeof (*reply) * num_msg);
  if (!reply)
    return PAM_CONV_ERR;

  for (replies = 0; replies < num_msg; replies++)
    {
      switch (msg[replies]->msg_style)
	{
	case PAM_PROMPT_ECHO_ON:
	  reply[replies].resp_retcode = PAM_SUCCESS;
	  reply[replies].resp = COPY_STRING (_user);
	  /* PAM frees resp */
	  break;

	case PAM_PROMPT_ECHO_OFF:
	  reply[replies].resp_retcode = PAM_SUCCESS;
	  reply[replies].resp = COPY_STRING (_pwd);
	  /* PAM frees resp */
	  break;

	case PAM_TEXT_INFO:
	case PAM_ERROR_MSG:
	  reply[replies].resp_retcode = PAM_SUCCESS;
	  reply[replies].resp = NULL;
	  break;
 
	default:
	  free (reply);
	  _perr = 1;
	  return PAM_CONV_ERR;
	}
    }
  *resp = reply;
  return PAM_SUCCESS;
}

static struct pam_conv PAM_conversation = { &mu_pam_conv, NULL };

int
mu_authenticate_pam (struct mu_auth_data **return_data ARG_UNUSED,
		     const void *key,
		     void *func_data ARG_UNUSED,
		     void *call_data)
{
  const struct mu_auth_data *auth_data = key;
  char *pass = call_data;
  pam_handle_t *pamh;
  int pamerror;

#define PAM_ERROR if (_perr || (pamerror != PAM_SUCCESS)) \
    goto pam_errlab;

  if (!auth_data)
    return 1;
  
  _user = (char *) auth_data->name;
  _pwd = pass;
  pamerror = pam_start (pam_service, _user, &PAM_conversation, &pamh);
  PAM_ERROR;
  pamerror = pam_authenticate (pamh, 0);
  PAM_ERROR;
  pamerror = pam_acct_mgmt (pamh, 0);
  PAM_ERROR;
  pamerror = pam_setcred (pamh, PAM_ESTABLISH_CRED);
 pam_errlab:
  pam_end (pamh, PAM_SUCCESS);
  return pamerror != PAM_SUCCESS;
}

#define ARG_PAM_SERVICE 1

static error_t
mu_pam_argp_parser (int key, char *arg, struct argp_state *state)
{
  switch (key)
    {
    case ARG_PAM_SERVICE:
      pam_service = arg;
      break;

    default:
      return ARGP_ERR_UNKNOWN;
    }
  return 0;
}

static struct argp_option mu_pam_argp_option[] = {
  { "pam-service", ARG_PAM_SERVICE, N_("STRING"), 0,
    N_("Use STRING as PAM service name"), 0},
  { NULL,      0, NULL, 0, NULL, 0 }
};

struct argp mu_pam_argp = {
  mu_pam_argp_option,
  mu_pam_argp_parser,
};


#else

int
mu_authenticate_pam (struct mu_auth_data **return_data ARG_UNUSED,
		     const void *key ARG_UNUSED,
		     void *func_data ARG_UNUSED,
		     void *call_data ARG_UNUSED)
{
  errno = ENOSYS;
  return 1;
}

#endif
  
struct mu_auth_module mu_auth_pam_module = {
  "pam",
#ifdef USE_LIBPAM
  &mu_pam_argp,
#else
  NULL,
#endif
  mu_authenticate_pam,
  NULL,
  mu_auth_nosupport,
  NULL,
  mu_auth_nosupport,
  NULL
};

Return to:

Send suggestions and report system problems to the System administrator.