/mandos/release

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/release
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
1
/*  -*- coding: utf-8 -*- */
2
/*
237.2.24 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Fix name in header.
3
 * Usplash - Read a password from usplash and output it
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
4
 * 
237.2.9 by Teddy Hogeborn
* README: Update copyright year; add "2009".
5
 * Copyright © 2008,2009 Teddy Hogeborn
6
 * Copyright © 2008,2009 Björn Påhlsson
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
7
 * 
8
 * This program is free software: you can redistribute it and/or
9
 * modify it under the terms of the GNU General Public License as
10
 * published by the Free Software Foundation, either version 3 of the
11
 * License, or (at your option) any later version.
12
 * 
13
 * This program is distributed in the hope that it will be useful, but
14
 * WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * General Public License for more details.
17
 * 
18
 * You should have received a copy of the GNU General Public License
19
 * along with this program.  If not, see
20
 * <http://www.gnu.org/licenses/>.
21
 * 
237.2.126 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
22
 * Contact the authors at <mandos@fukt.bsnet.se>.
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
23
 */
24
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
25
#define _GNU_SOURCE		/* asprintf(), TEMP_FAILURE_RETRY() */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
26
#include <signal.h>		/* sig_atomic_t, struct sigaction,
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
27
				   sigemptyset(), sigaddset(), SIGINT,
28
				   SIGHUP, SIGTERM, sigaction(),
29
				   SIG_IGN, kill(), SIGKILL */
30
#include <stdbool.h>		/* bool, false, true */
31
#include <fcntl.h>		/* open(), O_WRONLY, O_RDONLY */
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
32
#include <iso646.h>		/* and, or, not*/
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
33
#include <errno.h>		/* errno, EINTR */
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
34
#include <sys/types.h>		/* size_t, ssize_t, pid_t, DIR, struct
35
				   dirent */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
36
#include <stddef.h>		/* NULL */
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
37
#include <string.h>		/* strlen(), memcmp() */
237.2.74 by Teddy Hogeborn
Overflows are not detected by sscanf(), so stop using it:
38
#include <stdio.h>		/* asprintf(), perror() */
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
39
#include <unistd.h>		/* close(), write(), readlink(),
40
				   read(), STDOUT_FILENO, sleep(),
41
				   fork(), setuid(), geteuid(),
42
				   setsid(), chdir(), dup2(),
43
				   STDERR_FILENO, execv() */
237.2.27 by Teddy Hogeborn
* plugin-runner.c (main): Use "sscanf" instead of "strtol"; using the
44
#include <stdlib.h>		/* free(), EXIT_FAILURE, realloc(),
45
				   EXIT_SUCCESS, malloc(), _exit() */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
46
#include <stdlib.h>		/* getenv() */
47
#include <dirent.h>		/* opendir(), readdir(), closedir() */
237.2.74 by Teddy Hogeborn
Overflows are not detected by sscanf(), so stop using it:
48
#include <inttypes.h>		/* intmax_t, strtoimax() */
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
49
#include <sys/stat.h>		/* struct stat, lstat(), S_ISLNK */
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
50
#include <sysexits.h>		/* EX_OSERR, EX_UNAVAILABLE */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
51
52
sig_atomic_t interrupted_by_signal = 0;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
53
int signal_received;
54
const char usplash_name[] = "/sbin/usplash";
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
55
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
56
static void termination_handler(int signum){
57
  if(interrupted_by_signal){
58
    return;
59
  }
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
60
  interrupted_by_signal = 1;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
61
  signal_received = signum;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
62
}
63
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
64
static bool usplash_write(int *fifo_fd_r,
65
			  const char *cmd, const char *arg){
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
66
  /* 
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
67
   * usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
68
   * usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
69
   * SEE ALSO
70
   *         usplash_write(8)
71
   */
72
  int ret;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
73
  if(*fifo_fd_r == -1){
74
    ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
75
    if(ret == -1){
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
76
      return false;
77
    }
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
78
    *fifo_fd_r = ret;
79
  }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
80
  
81
  const char *cmd_line;
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
82
  size_t cmd_line_len;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
83
  char *cmd_line_alloc = NULL;
84
  if(arg == NULL){
85
    cmd_line = cmd;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
86
    cmd_line_len = strlen(cmd) + 1;
237.2.126 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
87
  } else {
88
    do {
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
89
      ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
90
      if(ret == -1){
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
91
	int e = errno;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
92
	TEMP_FAILURE_RETRY(close(*fifo_fd_r));
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
93
	errno = e;
94
	return false;
95
      }
237.2.126 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
96
    } while(ret == -1);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
97
    cmd_line = cmd_line_alloc;
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
98
    cmd_line_len = (size_t)ret + 1;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
99
  }
100
  
101
  size_t written = 0;
237.3.2 by Mooie
Fixed warnings in the 64 bit build. Added explicit cast to int for
102
  ssize_t sret = 0;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
103
  while(written < cmd_line_len){
104
    sret = write(*fifo_fd_r, cmd_line + written,
237.3.2 by Mooie
Fixed warnings in the 64 bit build. Added explicit cast to int for
105
		 cmd_line_len - written);
106
    if(sret == -1){
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
107
      int e = errno;
108
      TEMP_FAILURE_RETRY(close(*fifo_fd_r));
109
      free(cmd_line_alloc);
110
      errno = e;
111
      return false;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
112
    }
237.3.2 by Mooie
Fixed warnings in the 64 bit build. Added explicit cast to int for
113
    written += (size_t)sret;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
114
  }
115
  free(cmd_line_alloc);
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
116
  
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
117
  return true;
118
}
119
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
120
/* Create prompt string */
121
char *makeprompt(void){
122
  int ret = 0;
123
  char *prompt;
124
  const char *const cryptsource = getenv("cryptsource");
125
  const char *const crypttarget = getenv("crypttarget");
126
  const char prompt_start[] = "Enter passphrase to unlock the disk";
127
  
128
  if(cryptsource == NULL){
129
    if(crypttarget == NULL){
130
      ret = asprintf(&prompt, "%s: ", prompt_start);
131
    } else {
132
      ret = asprintf(&prompt, "%s (%s): ", prompt_start,
133
		     crypttarget);
134
    }
135
  } else {
136
    if(crypttarget == NULL){
137
      ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
138
    } else {
139
      ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
140
		     cryptsource, crypttarget);
141
    }
142
  }
143
  if(ret == -1){
144
    return NULL;
145
  }
146
  return prompt;
147
}
148
149
pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
150
  int ret = 0;
151
  ssize_t sret = 0;
152
  char *cmdline = NULL;
153
  size_t cmdline_len = 0;
154
  DIR *proc_dir = opendir("/proc");
155
  if(proc_dir == NULL){
156
    perror("opendir");
157
    return -1;
158
  }
159
  errno = 0;
160
  for(struct dirent *proc_ent = readdir(proc_dir);
161
      proc_ent != NULL;
162
      proc_ent = readdir(proc_dir)){
163
    pid_t pid;
164
    {
165
      intmax_t tmpmax;
166
      char *tmp;
167
      tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
168
      if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
169
	 or tmpmax != (pid_t)tmpmax){
170
	/* Not a process */
171
	errno = 0;
172
	continue;
173
      }
174
      pid = (pid_t)tmpmax;
175
    }
176
    /* Find the executable name by doing readlink() on the
177
       /proc/<pid>/exe link */
178
    char exe_target[sizeof(usplash_name)];
179
    {
180
      /* create file name string */
181
      char *exe_link;
182
      ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
183
      if(ret == -1){
184
	perror("asprintf");
185
	goto fail_find_usplash;
186
      }
187
      
188
      /* Check that it refers to a symlink owned by root:root */
189
      struct stat exe_stat;
190
      ret = lstat(exe_link, &exe_stat);
191
      if(ret == -1){
192
	if(errno == ENOENT){
193
	  free(exe_link);
194
	  continue;
195
	}
196
	perror("lstat");
197
	free(exe_link);
198
	goto fail_find_usplash;
199
      }
200
      if(not S_ISLNK(exe_stat.st_mode)
201
	 or exe_stat.st_uid != 0
202
	 or exe_stat.st_gid != 0){
203
	free(exe_link);
204
	continue;
205
      }
206
	
207
      sret = readlink(exe_link, exe_target, sizeof(exe_target));
208
      free(exe_link);
209
    }
210
    /* Compare executable name */
211
    if((sret != ((ssize_t)sizeof(exe_target)-1))
212
       or (memcmp(usplash_name, exe_target,
213
		  sizeof(exe_target)-1) != 0)){
214
      /* Not it */
215
      continue;
216
    }
217
    /* Found usplash */
218
    /* Read and save the command line of usplash in "cmdline" */
219
    {
220
      /* Open /proc/<pid>/cmdline  */
221
      int cl_fd;
222
      {
223
	char *cmdline_filename;
224
	ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
225
		       proc_ent->d_name);
226
	if(ret == -1){
227
	  perror("asprintf");
228
	  goto fail_find_usplash;
229
	}
230
	cl_fd = open(cmdline_filename, O_RDONLY);
231
	free(cmdline_filename);
232
	if(cl_fd == -1){
233
	  perror("open");
234
	  goto fail_find_usplash;
235
	}
236
      }
237
      size_t cmdline_allocated = 0;
238
      char *tmp;
239
      const size_t blocksize = 1024;
240
      do {
241
	/* Allocate more space? */
242
	if(cmdline_len + blocksize > cmdline_allocated){
243
	  tmp = realloc(cmdline, cmdline_allocated + blocksize);
244
	  if(tmp == NULL){
245
	    perror("realloc");
246
	    close(cl_fd);
247
	    goto fail_find_usplash;
248
	  }
249
	  cmdline = tmp;
250
	  cmdline_allocated += blocksize;
251
	}
252
	/* Read data */
253
	sret = read(cl_fd, cmdline + cmdline_len,
254
		    cmdline_allocated - cmdline_len);
255
	if(sret == -1){
256
	  perror("read");
257
	  close(cl_fd);
258
	  goto fail_find_usplash;
259
	}
260
	cmdline_len += (size_t)sret;
261
      } while(sret != 0);
262
      ret = close(cl_fd);
263
      if(ret == -1){
264
	perror("close");
265
	goto fail_find_usplash;
266
      }
267
    }
268
    /* Close directory */
269
    ret = closedir(proc_dir);
270
    if(ret == -1){
271
      perror("closedir");
272
      goto fail_find_usplash;
273
    }
274
    /* Success */
275
    *cmdline_r = cmdline;
276
    *cmdline_len_r = cmdline_len;
277
    return pid;
278
  }
279
  
280
 fail_find_usplash:
281
  
282
  free(cmdline);
283
  if(proc_dir != NULL){
284
    int e = errno;
285
    closedir(proc_dir);
286
    errno = e;
287
  }
288
  return 0;
289
}
290
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
291
int main(__attribute__((unused))int argc,
292
	 __attribute__((unused))char **argv){
293
  int ret = 0;
294
  ssize_t sret;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
295
  int fifo_fd = -1;
296
  int outfifo_fd = -1;
297
  char *buf = NULL;
298
  size_t buf_len = 0;
299
  pid_t usplash_pid = -1;
300
  bool usplash_accessed = false;
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
301
  int status = EXIT_FAILURE;	/* Default failure exit status */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
302
  
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
303
  char *prompt = makeprompt();
304
  if(prompt == NULL){
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
305
    status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
306
    goto failure;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
307
  }
308
  
309
  /* Find usplash process */
310
  char *cmdline = NULL;
311
  size_t cmdline_len = 0;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
312
  usplash_pid = find_usplash(&cmdline, &cmdline_len);
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
313
  if(usplash_pid == 0){
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
314
    status = EX_UNAVAILABLE;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
315
    goto failure;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
316
  }
317
  
318
  /* Set up the signal handler */
319
  {
320
    struct sigaction old_action,
321
      new_action = { .sa_handler = termination_handler,
322
		     .sa_flags = 0 };
323
    sigemptyset(&new_action.sa_mask);
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
324
    ret = sigaddset(&new_action.sa_mask, SIGINT);
325
    if(ret == -1){
326
      perror("sigaddset");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
327
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
328
      goto failure;
329
    }
330
    ret = sigaddset(&new_action.sa_mask, SIGHUP);
331
    if(ret == -1){
332
      perror("sigaddset");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
333
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
334
      goto failure;
335
    }
336
    ret = sigaddset(&new_action.sa_mask, SIGTERM);
337
    if(ret == -1){
338
      perror("sigaddset");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
339
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
340
      goto failure;
341
    }
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
342
    ret = sigaction(SIGINT, NULL, &old_action);
343
    if(ret == -1){
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
344
      if(errno != EINTR){
345
	perror("sigaction");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
346
	status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
347
      }
348
      goto failure;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
349
    }
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
350
    if(old_action.sa_handler != SIG_IGN){
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
351
      ret = sigaction(SIGINT, &new_action, NULL);
352
      if(ret == -1){
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
353
	if(errno != EINTR){
354
	  perror("sigaction");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
355
	  status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
356
	}
357
	goto failure;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
358
      }
359
    }
360
    ret = sigaction(SIGHUP, NULL, &old_action);
361
    if(ret == -1){
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
362
      if(errno != EINTR){
363
	perror("sigaction");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
364
	status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
365
      }
366
      goto failure;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
367
    }
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
368
    if(old_action.sa_handler != SIG_IGN){
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
369
      ret = sigaction(SIGHUP, &new_action, NULL);
370
      if(ret == -1){
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
371
	if(errno != EINTR){
372
	  perror("sigaction");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
373
	  status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
374
	}
375
	goto failure;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
376
      }
377
    }
378
    ret = sigaction(SIGTERM, NULL, &old_action);
379
    if(ret == -1){
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
380
      if(errno != EINTR){
381
	perror("sigaction");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
382
	status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
383
      }
384
      goto failure;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
385
    }
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
386
    if(old_action.sa_handler != SIG_IGN){
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
387
      ret = sigaction(SIGTERM, &new_action, NULL);
388
      if(ret == -1){
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
389
	if(errno != EINTR){
390
	  perror("sigaction");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
391
	  status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
392
	}
393
	goto failure;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
394
      }
395
    }
396
  }
397
  
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
398
  usplash_accessed = true;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
399
  /* Write command to FIFO */
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
400
  if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
401
    if(errno != EINTR){
402
      perror("usplash_write");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
403
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
404
    }
405
    goto failure;
406
  }
407
  
408
  if(interrupted_by_signal){
409
    goto failure;
410
  }
411
  
412
  if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
413
    if(errno != EINTR){
414
      perror("usplash_write");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
415
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
416
    }
417
    goto failure;
418
  }
419
  
420
  if(interrupted_by_signal){
421
    goto failure;
422
  }
423
  
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
424
  free(prompt);
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
425
  prompt = NULL;
426
  
427
  /* Read reply from usplash */
428
  /* Open FIFO */
429
  outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
430
  if(outfifo_fd == -1){
431
    if(errno != EINTR){
432
      perror("open");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
433
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
434
    }
435
    goto failure;
436
  }
437
  
438
  if(interrupted_by_signal){
439
    goto failure;
440
  }
441
  
442
  /* Read from FIFO */
443
  size_t buf_allocated = 0;
444
  const size_t blocksize = 1024;
445
  do {
446
    /* Allocate more space */
447
    if(buf_len + blocksize > buf_allocated){
448
      char *tmp = realloc(buf, buf_allocated + blocksize);
449
      if(tmp == NULL){
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
450
	if(errno != EINTR){
451
	  perror("realloc");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
452
	  status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
453
	}
454
	goto failure;
455
      }
456
      buf = tmp;
457
      buf_allocated += blocksize;
458
    }
459
    sret = read(outfifo_fd, buf + buf_len,
460
		buf_allocated - buf_len);
461
    if(sret == -1){
462
      if(errno != EINTR){
463
	perror("read");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
464
	status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
465
      }
466
      TEMP_FAILURE_RETRY(close(outfifo_fd));
467
      goto failure;
468
    }
469
    if(interrupted_by_signal){
470
      break;
471
    }
472
    
473
    buf_len += (size_t)sret;
474
  } while(sret != 0);
475
  ret = close(outfifo_fd);
476
  if(ret == -1){
477
    if(errno != EINTR){
478
      perror("close");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
479
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
480
    }
481
    goto failure;
482
  }
483
  outfifo_fd = -1;
484
  
485
  if(interrupted_by_signal){
486
    goto failure;
487
  }
488
  
489
  if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
490
    if(errno != EINTR){
491
      perror("usplash_write");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
492
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
493
    }
494
    goto failure;
495
  }
496
  
497
  if(interrupted_by_signal){
498
    goto failure;
499
  }
500
  
501
  ret = close(fifo_fd);
502
  if(ret == -1){
503
    if(errno != EINTR){
504
      perror("close");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
505
      status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
506
    }
507
    goto failure;
508
  }
509
  fifo_fd = -1;
510
  
511
  /* Print password to stdout */
512
  size_t written = 0;
513
  while(written < buf_len){
514
    do {
515
      sret = write(STDOUT_FILENO, buf + written, buf_len - written);
516
      if(sret == -1){
517
	if(errno != EINTR){
518
	  perror("write");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
519
	  status = EX_OSERR;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
520
	}
521
	goto failure;
522
      }
523
    } while(sret == -1);
524
    
525
    if(interrupted_by_signal){
526
      goto failure;
527
    }
528
    written += (size_t)sret;
529
  }
530
  free(buf);
531
  buf = NULL;
532
  
533
  if(interrupted_by_signal){
534
    goto failure;
535
  }
536
  
537
  free(cmdline);
538
  return EXIT_SUCCESS;
539
  
540
 failure:
541
  
542
  free(buf);
543
  
544
  free(prompt);
545
  
546
  /* If usplash was never accessed, we can stop now */
547
  if(not usplash_accessed){
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
548
    return status;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
549
  }
550
  
551
  /* Close FIFO */
552
  if(fifo_fd != -1){
553
    ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
554
    if(ret == -1 and errno != EINTR){
555
      perror("close");
556
    }
557
    fifo_fd = -1;
558
  }
559
  
560
  /* Close output FIFO */
561
  if(outfifo_fd != -1){
562
    ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
563
    if(ret == -1){
564
      perror("close");
565
    }
566
  }
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
567
  
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
568
  /* Create argc and argv for new usplash*/
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
569
  int cmdline_argc = 0;
570
  char **cmdline_argv = malloc(sizeof(char *));
571
  {
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
572
    size_t position = 0;
573
    while(position < cmdline_len){
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
574
      char **tmp = realloc(cmdline_argv,
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
575
			   (sizeof(char *)
576
			    * (size_t)(cmdline_argc + 2)));
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
577
      if(tmp == NULL){
578
	perror("realloc");
579
	free(cmdline_argv);
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
580
	return status;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
581
      }
582
      cmdline_argv = tmp;
583
      cmdline_argv[cmdline_argc] = cmdline + position;
584
      cmdline_argc++;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
585
      position += strlen(cmdline + position) + 1;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
586
    }
587
    cmdline_argv[cmdline_argc] = NULL;
588
  }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
589
  /* Kill old usplash */
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
590
  kill(usplash_pid, SIGTERM);
591
  sleep(2);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
592
  while(kill(usplash_pid, 0) == 0){
593
    kill(usplash_pid, SIGKILL);
594
    sleep(1);
595
  }
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
596
  
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
597
  pid_t new_usplash_pid = fork();
598
  if(new_usplash_pid == 0){
599
    /* Child; will become new usplash process */
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
600
    
601
    /* Make the effective user ID (root) the only user ID instead of
237.2.28 by Teddy Hogeborn
* plugin-runner.c (main): Bug fix; do not accept a "d" character after
602
       the real user ID (_mandos) */
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
603
    ret = setuid(geteuid());
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
604
    if(ret == -1){
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
605
      perror("setuid");
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
606
    }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
607
    
608
    setsid();
609
    ret = chdir("/");
24.1.148 by Björn Påhlsson
half working on-demand password and approved code
610
    if(ret == -1){
611
      perror("chdir");
612
      _exit(EX_OSERR);
613
    }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
614
/*     if(fork() != 0){ */
615
/*       _exit(EXIT_SUCCESS); */
616
/*     } */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
617
    ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
618
    if(ret == -1){
619
      perror("dup2");
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
620
      _exit(EX_OSERR);
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
621
    }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
622
    
623
    execv(usplash_name, cmdline_argv);
223 by Teddy Hogeborn
* .bzrignore (plugins.d/askpass-fifo): Added.
624
    if(not interrupted_by_signal){
625
      perror("execv");
626
    }
213 by Teddy Hogeborn
* plugins.d/usplash.c (main): Bug fix: Do not free "cmdline" too soon.
627
    free(cmdline);
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
628
    free(cmdline_argv);
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
629
    _exit(EX_OSERR);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
630
  }
213 by Teddy Hogeborn
* plugins.d/usplash.c (main): Bug fix: Do not free "cmdline" too soon.
631
  free(cmdline);
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
632
  free(cmdline_argv);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
633
  sleep(2);
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
634
  if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
635
    if(errno != EINTR){
636
      perror("usplash_write");
637
    }
638
  }
639
  
640
  /* Close FIFO (again) */
237.2.136 by Teddy Hogeborn
* plugins.d/usplash.c (main): Bug fix: only close FIFO if opened.
641
  if(fifo_fd != -1){
642
    ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
643
    if(ret == -1 and errno != EINTR){
644
      perror("close");
645
    }
646
    fifo_fd = -1;
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
647
  }
648
  
649
  if(interrupted_by_signal){
650
    struct sigaction signal_action = { .sa_handler = SIG_DFL };
651
    sigemptyset(&signal_action.sa_mask);
652
    ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
653
					    &signal_action, NULL));
654
    if(ret == -1){
655
      perror("sigaction");
656
    }
657
    do {
658
      ret = raise(signal_received);
659
    } while(ret != 0 and errno == EINTR);
660
    if(ret != 0){
661
      perror("raise");
662
      abort();
663
    }
664
    TEMP_FAILURE_RETRY(pause());
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
665
  }
666
  
237.2.159 by Teddy Hogeborn
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
667
  return status;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
668
}