summaryrefslogtreecommitdiff
path: root/src/bin/e_ckpasswd_main.c
blob: 1212f53c33f251eaeb492ac258615638642d9656 (plain) (blame)
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
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
#include "e_util_suid.h"

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#endif

#include <Eina.h>
#include <Ecore.h>
#include <Eldbus.h>

static uid_t uid = -1; // uid of person running me
static gid_t gid = -1; // gid of person running me
static char *user_name = NULL;
static char *group_name = NULL;

#if defined(__OpenBSD__)

static int
_check_auth(uid_t id, const char *guess)
{
   struct passwd *pwent;

   pwent = getpwuid_shadow(id);
   if (!pwent) return -1;
   if (!pwent->pw_passwd) return -1;

   return crypt_checkpass(guess, pwent->pw_passwd);
}





#elif defined(__FreeBSD__)
#include <security/pam_constants.h>

static int
_check_auth(uid_t id, const char *pw)
{
   struct passwd *pwent = getpwuid(id);

   if (!pwent) return -1;
   if (!pwent->pw_passwd) return -1;

   if (!strcmp(crypt(pw, pwent->pw_passwd), pwent->pw_passwd)) return 0;
   return -1;
}





#elif defined(HAVE_PAM)
# include <security/pam_appl.h>

typedef struct
{
   const char *user;
   const char *pw;
} Authinfo;

static int
_conv_cb(int num, const struct pam_message **msg, struct pam_response **resp, void *data)
{
   Authinfo *ai = data;
   int replies;
   struct pam_response *reply = NULL;

   reply = malloc(sizeof(struct pam_response) * num);
   if (!reply) return PAM_CONV_ERR;

   for (replies = 0; replies < num; replies++)
     {
        switch (msg[replies]->msg_style)
          {
           case PAM_PROMPT_ECHO_ON:
             reply[replies].resp_retcode = PAM_SUCCESS;
             reply[replies].resp = strdup(ai->user);
             break;
           case PAM_PROMPT_ECHO_OFF:
             reply[replies].resp_retcode = PAM_SUCCESS;
             reply[replies].resp = strdup(ai->pw);
             break;
           case PAM_ERROR_MSG:
           case PAM_TEXT_INFO:
             reply[replies].resp_retcode = PAM_SUCCESS;
             reply[replies].resp = NULL;
             break;
           default:
             free(reply);
             return PAM_CONV_ERR;
          }
     }
   *resp = reply;
   return PAM_SUCCESS;
}

static int
_check_auth(uid_t id, const char *pw)
{
   Authinfo ai;
   struct passwd *pwent;
   const char *user;
   const char *prof;
   const char *host;
   struct stat st;
   pam_handle_t *handle;
   int pamerr;
   struct pam_conv conv;

   pwent = getpwuid(id);
   if (!pwent) return -1;
   user = pwent->pw_name;
   if (!user) return -1;

   host = "localhost";

   prof = "login";
   if      (!stat("/etc/pam.d/enlightenment", &st)) prof = "enlightenment";
   else if (!stat("/etc/pam.d/xscreensaver", &st))  prof = "xscreensaver";
   else if (!stat("/etc/pam.d/kscreensaver", &st))  prof = "kscreensaver";
   else if (!stat("/etc/pam.d/system-auth", &st))   prof = "system-auth";
   else if (!stat("/etc/pam.d/system", &st))        prof = "system";
   else if (!stat("/etc/pam.d/xdm", &st))           prof = "xdm";
   else if (!stat("/etc/pam.d/gdm", &st))           prof = "gdm";
   else if (!stat("/etc/pam.d/kdm", &st))           prof = "kdm";

   ai.user = user;
   ai.pw = pw;

   conv.conv = _conv_cb;
   conv.appdata_ptr = &ai;
   if (pam_start(prof, user, &conv, &handle) != PAM_SUCCESS) return -1;
   if (pam_set_item(handle, PAM_USER, user) != PAM_SUCCESS) return -1;
   if (pam_set_item(handle, PAM_RHOST, host) != PAM_SUCCESS) return -1;

   pamerr = pam_authenticate(handle, 0);
   pam_end(handle, pamerr);

   if (pamerr != PAM_SUCCESS) return -1;

   return 0;
}





#else

static int
_check_auth(uid_t id, const char *pw)
{
   return -1;
}





#endif

static int polkit_auth_ok = -1;

static void
polkit_agent_response(void *data EINA_UNUSED, const Eldbus_Message *msg,
                      Eldbus_Pending *pending EINA_UNUSED)
{
   const char *name, *text;

   ecore_main_loop_quit();
   if (eldbus_message_error_get(msg, &name, &text))
     {
        fprintf(stderr, "AUTH: Could not respond to auth.\n %s:\n %s\n", name, text);
        return;
     }
   polkit_auth_ok = 0;
   fprintf(stderr, "AUTH: OK\n");
}

int
polkit_auth(const char *cookie, unsigned int auth_uid)
{
   Eldbus_Connection *c;
   Eldbus_Object *obj;
   Eldbus_Proxy *proxy;
   Eldbus_Message *m;
   Eldbus_Message_Iter *iter, *subj, *array, *dict, *vari;

   eina_init();
   ecore_init();
   eldbus_init();
   c = eldbus_connection_get(ELDBUS_CONNECTION_TYPE_SYSTEM);
#define BARF(str) do { \
   fprintf(stderr, "AUTH: POLKIT: %s\n", str); \
   return -1; \
} while (0)
   if (!c) BARF("Cannot get session dbus");
   obj = eldbus_object_get(c, "org.freedesktop.PolicyKit1",
                           "/org/freedesktop/PolicyKit1/Authority");
   if (!obj) BARF("Cannot get obj: org.freedesktop.PolicyKit1 /org/freedesktop/PolicyKit1/Authority");
   proxy = eldbus_proxy_get(obj, "org.freedesktop.PolicyKit1.Authority");
   if (!proxy) BARF("Cannot proxy: org.freedesktop.PolicyKit1.Authority");
   m = eldbus_proxy_method_call_new(proxy, "AuthenticationAgentResponse2");
   if (!m) BARF("Cannot get method call: AuthenticationAgentResponse2");
   iter = eldbus_message_iter_get(m);
   if (!iter) BARF("Cannot set iter on proxy");
   if (!eldbus_message_iter_arguments_append(iter, "us", uid, cookie))
     BARF("Cannot append 'us' args");
   if (!eldbus_message_iter_arguments_append(iter, "(sa{sv})", &subj))
     BARF("Cannot append '(sa{sv})' args");
   if (!eldbus_message_iter_basic_append(subj, 's', "unix-user"))
     BARF("Cannot append 's' arg for unix-user");
   if (!eldbus_message_iter_arguments_append(subj, "a{sv}", &array))
     BARF("Cannot append 'a{sv}' args");
   if (!eldbus_message_iter_arguments_append(array, "{sv}", &dict))
     BARF("Cannot append '{sv}' args");
   if (!eldbus_message_iter_basic_append(dict, 's', "uid"))
     BARF("Cannot append 's' arg for uid");
   vari = eldbus_message_iter_container_new(dict, 'v', "u");
   if (!vari)
     BARF("Cannot create new iter container");
   if (!eldbus_message_iter_basic_append(vari, 'u', auth_uid))
     BARF("Cannot append 'u' arg for auth_uid");
   eldbus_message_iter_container_close(dict, vari);
   eldbus_message_iter_container_close(array, dict);
   eldbus_message_iter_container_close(subj, array);
   eldbus_message_iter_container_close(iter, subj);
   eldbus_proxy_send(proxy, m, polkit_agent_response, NULL, -1);

   ecore_main_loop_begin();

   eldbus_connection_unref(c);
   eldbus_shutdown();
   ecore_shutdown();
   eina_shutdown();
   return polkit_auth_ok;
}

int
main(int argc, char **argv)
{
   ssize_t rd;
   char pw[4096], *p;
   int polkit_mode = 0;
   char polkit_cookie[4096];
   unsigned int polkit_uid = 0;

   if (argc < 2)
     {
        fprintf(stderr, "This is an internal tool for Enlightenment\n");
        fprintf(stderr, "Options: pw | pk\n");
        goto err;
     }
   if      (!strcmp(argv[1], "pw")) polkit_mode = 0;
   else if (!strcmp(argv[1], "pk")) polkit_mode = 1;

   // read passwd from stdin
   if (polkit_mode == 0)
     {
        rd = read(0, pw, sizeof(pw) - 1);
        if (rd < 0)
          {
             fprintf(stderr, "AUTH: Error. Can't read passwd on stdin\n");
             goto err;
          }
        pw[rd] = 0;
        for (p = pw; *p; p++)
          {
             if ((*p == '\r') || (*p == '\n'))
               {
                  *p = 0;
                  break;
               }
          }
     }
   else if (polkit_mode == 1)
     {
        unsigned int pos = 0;

        // read "cookie-string uid-string password...[\r|\n|EOF]"
        for (;;) // cookie
          {
             rd = read(0, pw + pos, 1);
             if (rd < 0)
               {
                  fprintf(stderr, "AUTH: POLKIT: Error. Can't read polkit cookie on stdin\n");
                  goto err;
               }
             if (pw[pos] == ' ')
               {
                  memcpy(polkit_cookie, pw, pos);
                  polkit_cookie[pos] = 0;
                  fprintf(stderr, "AUTH: POLKIT: [%s]\n", polkit_cookie);
                  pos = 0;
                  break;
               }
             else
               {
                  pos++;
                  if (pos > 4000)
                    {
                       fprintf(stderr, "AUTH: POLKIT: Error. Polkit cookie too long\n");
                       return -10;
                    }
               }
          }
        for (;;) // uid
          {
             rd = read(0, pw + pos, 1);
             if (rd < 0)
               {
                  fprintf(stderr, "AUTH: Error. Can't read polkit uid on stdin\n");
                  goto err;
               }
             if (pw[pos] == ' ')
               {
                  pw[pos] = 0;
                  polkit_uid = atoi(pw);
                  fprintf(stderr, "AUTH: UID: [%u]\n", polkit_uid);
                  break;
               }
             else
               {
                  pos++;
                  if (pos > 4000)
                    {
                       fprintf(stderr, "AUTH: Error. Polkit uid too long\n");
                       return -11;
                    }
               }
          }
        // password
        fprintf(stderr, "AUTH: readpass...\n");
        rd = read(0, pw, sizeof(pw) - 1);
        if (rd < 0)
          {
             fprintf(stderr, "AUTH: Error. Can't read passwd on stdin\n");
             goto err;
          }
        pw[rd] = 0;
        for (p = pw; *p; p++)
          {
             if ((*p == '\r') || (*p == '\n'))
               {
                  *p = 0;
                  break;
               }
          }
     }

   // ok to fail - auth will just possibly fail then
   e_setuid_setup(&uid, &gid, &user_name, &group_name);

   if (_check_auth(polkit_mode ? polkit_uid : uid, pw) == 0)
     {
        fprintf(stderr, "AUTH: Password OK\n");
        if (polkit_mode == 1)
          {
             if (polkit_auth(polkit_cookie, uid) == 0)
               {
                  fprintf(stderr, "AUTH: Polkit AuthenticationAgentResponse2 success\n");
                  return 0;
               }
             fprintf(stderr, "AUTH: Polkit AuthenticationAgentResponse2 failure\n");
             return -2;
          }
        return 0;
     }
err:
   fprintf(stderr, "AUTH: Password auth fail\n");
   return -1;
}