/mandos/trunk

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/trunk
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
1
/*  -*- coding: utf-8 -*- */
2
/*
261 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Fix name in header.
3
 * Password-prompt - Read a password from the terminal and print it
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
4
 * 
246 by Teddy Hogeborn
* README: Update copyright year; add "2009".
5
 * Copyright © 2008,2009 Teddy Hogeborn
6
 * Copyright © 2008,2009 Björn Påhlsson
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
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
 * 
22
 * Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
 * <https://www.fukt.bsnet.se/~teddy/>.
24
 */
25
13 by Björn Påhlsson
Added following support:
26
#define _GNU_SOURCE		/* getline() */
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
27
13 by Björn Påhlsson
Added following support:
28
#include <termios.h> 		/* struct termios, tcsetattr(),
29
				   TCSAFLUSH, tcgetattr(), ECHO */
30
#include <unistd.h>		/* struct termios, tcsetattr(),
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				   STDIN_FILENO, TCSAFLUSH,
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				   tcgetattr(), ECHO */
33
#include <signal.h>		/* sig_atomic_t, raise(), struct
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				   sigaction, sigemptyset(),
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				   sigaction(), sigaddset(), SIGINT,
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				   SIGQUIT, SIGHUP, SIGTERM */
24.1.26 by Björn Påhlsson
tally count of used symbols
37
#include <stddef.h>		/* NULL, size_t, ssize_t */
13 by Björn Påhlsson
Added following support:
38
#include <sys/types.h>		/* ssize_t */
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
39
#include <stdlib.h>		/* EXIT_SUCCESS, EXIT_FAILURE,
79 by Teddy Hogeborn
* plugins.d/password-request.c (main): Include environment variables
40
				   getopt_long, getenv() */
13 by Björn Påhlsson
Added following support:
41
#include <stdio.h>		/* fprintf(), stderr, getline(),
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				   stdin, feof(), perror(), fputc(),
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
43
				   stdout, getopt_long */
13 by Björn Påhlsson
Added following support:
44
#include <errno.h>		/* errno, EINVAL */
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#include <iso646.h>		/* or, not */
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#include <stdbool.h>		/* bool, false, true */
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
47
#include <string.h> 		/* strlen, rindex, strncmp, strcmp */
24.1.26 by Björn Påhlsson
tally count of used symbols
48
#include <argp.h>		/* struct argp_option, struct
49
				   argp_state, struct argp,
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				   argp_parse(), error_t,
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				   ARGP_KEY_ARG, ARGP_KEY_END,
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				   ARGP_ERR_UNKNOWN */
13 by Björn Påhlsson
Added following support:
53
54
volatile bool quit_now = false;
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
55
bool debug = false;
217 by Teddy Hogeborn
* .bzrignore: Added "man" directory (created by "make install-html").
56
const char *argp_program_version = "password-prompt " VERSION;
24.1.17 by Björn Påhlsson
passprompt
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
13 by Björn Påhlsson
Added following support:
58
37 by Teddy Hogeborn
Non-tested commit for merge purposes.
59
static void termination_handler(__attribute__((unused))int signum){
13 by Björn Påhlsson
Added following support:
60
  quit_now = true;
61
}
62
63
int main(int argc, char **argv){
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
64
  ssize_t ret;
13 by Björn Påhlsson
Added following support:
65
  size_t n;
66
  struct termios t_new, t_old;
67
  char *buffer = NULL;
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
68
  char *prefix = NULL;
13 by Björn Påhlsson
Added following support:
69
  int status = EXIT_SUCCESS;
70
  struct sigaction old_action,
71
    new_action = { .sa_handler = termination_handler,
72
		   .sa_flags = 0 };
24.1.17 by Björn Påhlsson
passprompt
73
  {
74
    struct argp_option options[] = {
75
      { .name = "prefix", .key = 'p',
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	.arg = "PREFIX", .flags = 0,
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
77
	.doc = "Prefix shown before the prompt", .group = 2 },
24.1.17 by Björn Påhlsson
passprompt
78
      { .name = "debug", .key = 128,
79
	.doc = "Debug mode", .group = 3 },
80
      { .name = NULL }
81
    };
257 by Teddy Hogeborn
Change the default value of the "checker" option command to make the
82
    
24.1.17 by Björn Påhlsson
passprompt
83
    error_t parse_opt (int key, char *arg, struct argp_state *state) {
84
      /* Get the INPUT argument from `argp_parse', which we know is a
85
	 pointer to our plugin list pointer. */
86
      switch (key) {
87
      case 'p':
88
	prefix = arg;
89
	break;
90
      case 128:
91
	debug = true;
92
	break;
93
      case ARGP_KEY_ARG:
94
	argp_usage (state);
95
	break;
96
      case ARGP_KEY_END:
97
	break;
98
      default:
99
	return ARGP_ERR_UNKNOWN;
100
      }
101
      return 0;
102
    }
257 by Teddy Hogeborn
Change the default value of the "checker" option command to make the
103
    
24.1.17 by Björn Påhlsson
passprompt
104
    struct argp argp = { .options = options, .parser = parse_opt,
105
			 .args_doc = "",
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
106
			 .doc = "Mandos password-prompt -- Read and"
107
			 " output a password" };
24.1.26 by Björn Påhlsson
tally count of used symbols
108
    ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
109
    if (ret == ARGP_ERR_UNKNOWN){
24.1.44 by Björn Påhlsson
Fixed unkown -> unknown
110
      fprintf(stderr, "Unknown error while parsing arguments\n");
24.1.26 by Björn Påhlsson
tally count of used symbols
111
      return EXIT_FAILURE;
112
    }
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
113
  }
257 by Teddy Hogeborn
Change the default value of the "checker" option command to make the
114
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
115
  if (debug){
116
    fprintf(stderr, "Starting %s\n", argv[0]);
117
  }
118
  if (debug){
119
    fprintf(stderr, "Storing current terminal attributes\n");
120
  }
13 by Björn Påhlsson
Added following support:
121
  
122
  if (tcgetattr(STDIN_FILENO, &t_old) != 0){
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
123
    perror("tcgetattr");
13 by Björn Påhlsson
Added following support:
124
    return EXIT_FAILURE;
125
  }
126
  
127
  sigemptyset(&new_action.sa_mask);
128
  sigaddset(&new_action.sa_mask, SIGINT);
129
  sigaddset(&new_action.sa_mask, SIGHUP);
130
  sigaddset(&new_action.sa_mask, SIGTERM);
24.1.26 by Björn Påhlsson
tally count of used symbols
131
  ret = sigaction(SIGINT, NULL, &old_action);
132
  if(ret == -1){
133
    perror("sigaction");
134
    return EXIT_FAILURE;
135
  }
136
  if (old_action.sa_handler != SIG_IGN){
137
    ret = sigaction(SIGINT, &new_action, NULL);
138
    if(ret == -1){
139
      perror("sigaction");
140
      return EXIT_FAILURE;
141
    }
142
  }
143
  ret = sigaction(SIGHUP, NULL, &old_action);
144
  if(ret == -1){
145
    perror("sigaction");
146
    return EXIT_FAILURE;
147
  }
148
  if (old_action.sa_handler != SIG_IGN){
149
    ret = sigaction(SIGHUP, &new_action, NULL);
150
    if(ret == -1){
151
      perror("sigaction");
152
      return EXIT_FAILURE;
153
    }
154
  }
155
  ret = sigaction(SIGTERM, NULL, &old_action);
156
  if(ret == -1){
157
    perror("sigaction");
158
    return EXIT_FAILURE;
159
  }
160
  if (old_action.sa_handler != SIG_IGN){
161
    ret = sigaction(SIGTERM, &new_action, NULL);
162
    if(ret == -1){
163
      perror("sigaction");
164
      return EXIT_FAILURE;
165
    }
166
  }
167
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
168
  
169
  if (debug){
170
    fprintf(stderr, "Removing echo flag from terminal attributes\n");
171
  }
13 by Björn Påhlsson
Added following support:
172
  
173
  t_new = t_old;
174
  t_new.c_lflag &= ~ECHO;
175
  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
176
    perror("tcsetattr-echo");
177
    return EXIT_FAILURE;
178
  }
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
179
180
  if (debug){
181
    fprintf(stderr, "Waiting for input from stdin \n");
182
  }
13 by Björn Påhlsson
Added following support:
183
  while(true){
184
    if (quit_now){
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
185
      if(debug){
186
	fprintf(stderr, "Interrupted by signal, exiting.\n");
187
      }
13 by Björn Påhlsson
Added following support:
188
      status = EXIT_FAILURE;
189
      break;
190
    }
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
191
192
    if(prefix){
79 by Teddy Hogeborn
* plugins.d/password-request.c (main): Include environment variables
193
      fprintf(stderr, "%s ", prefix);
194
    }
195
    {
196
      const char *cryptsource = getenv("cryptsource");
197
      const char *crypttarget = getenv("crypttarget");
198
      const char *const prompt
199
	= "Enter passphrase to unlock the disk";
200
      if(cryptsource == NULL){
201
	if(crypttarget == NULL){
202
	  fprintf(stderr, "%s: ", prompt);
203
	} else {
204
	  fprintf(stderr, "%s (%s): ", prompt, crypttarget);
205
	}
206
      } else {
207
	if(crypttarget == NULL){
208
	  fprintf(stderr, "%s %s: ", prompt, cryptsource);
209
	} else {
210
	  fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
211
		  crypttarget);
212
	}
213
      }
214
    }
13 by Björn Påhlsson
Added following support:
215
    ret = getline(&buffer, &n, stdin);
216
    if (ret > 0){
217
      status = EXIT_SUCCESS;
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
218
      /* Make n = data size instead of allocated buffer size */
219
      n = (size_t)ret;
168 by Teddy Hogeborn
* initramfs-tools-hook: Use long options where available. Use only
220
      /* Strip final newline */
221
      if(n>0 and buffer[n-1] == '\n'){
222
	buffer[n-1] = '\0';	/* not strictly necessary */
223
	n--;
224
      }
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
225
      size_t written = 0;
226
      while(written < n){
227
	ret = write(STDOUT_FILENO, buffer + written, n - written);
228
	if(ret < 0){
229
	  perror("write");
230
	  status = EXIT_FAILURE;
231
	  break;
232
	}
233
	written += (size_t)ret;
234
      }
13 by Björn Påhlsson
Added following support:
235
      break;
236
    }
237
    if (ret < 0){
238
      if (errno != EINTR and not feof(stdin)){
239
	perror("getline");
240
	status = EXIT_FAILURE;
241
	break;
242
      }
243
    }
41 by Teddy Hogeborn
Merge.
244
    /* if(ret == 0), then the only sensible thing to do is to retry to
245
       read from stdin */
13 by Björn Påhlsson
Added following support:
246
    fputc('\n', stderr);
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
247
    if(debug and not quit_now){
248
      /* If quit_now is true, we were interrupted by a signal, and
249
	 will print that later, so no need to show this too. */
250
      fprintf(stderr, "getline() returned 0, retrying.\n");
251
    }
13 by Björn Påhlsson
Added following support:
252
  }
257 by Teddy Hogeborn
Change the default value of the "checker" option command to make the
253
  
24.1.92 by Björn Påhlsson
Several memory leaks detected by valgrind fixed
254
  free(buffer);
41 by Teddy Hogeborn
Merge.
255
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
256
  if (debug){
257
    fprintf(stderr, "Restoring terminal attributes\n");
258
  }
13 by Björn Påhlsson
Added following support:
259
  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
260
    perror("tcsetattr+echo");
261
  }
41 by Teddy Hogeborn
Merge.
262
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
263
  if (debug){
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
264
    fprintf(stderr, "%s is exiting with status %d\n", argv[0],
265
	    status);
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
266
  }
167 by Teddy Hogeborn
* plugins.d/password-prompt.c (main): If successful, output an extra
267
  if(status == EXIT_SUCCESS){
268
    fputc('\n', stderr);
269
  }
13 by Björn Påhlsson
Added following support:
270
  
271
  return status;
272
}