/mandos/release

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/release
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
1
/*  -*- coding: utf-8 -*- */
2
/*
3
 * Passprompt - Read a password from the terminal and print it
4
 *
24.1.102 by Björn Påhlsson
changed 2007-2008 copyright notice to 2008
5
 * Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
6
 * 
7
 * This program is free software: you can redistribute it and/or
8
 * modify it under the terms of the GNU General Public License as
9
 * published by the Free Software Foundation, either version 3 of the
10
 * License, or (at your option) any later version.
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 * 
12
 * This program is distributed in the hope that it will be useful, but
13
 * WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * General Public License for more details.
16
 * 
17
 * You should have received a copy of the GNU General Public License
18
 * along with this program.  If not, see
19
 * <http://www.gnu.org/licenses/>.
20
 * 
21
 * Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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 * <https://www.fukt.bsnet.se/~teddy/>.
23
 */
24
13 by Björn Påhlsson
Added following support:
25
#define _GNU_SOURCE		/* getline() */
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
26
13 by Björn Påhlsson
Added following support:
27
#include <termios.h> 		/* struct termios, tcsetattr(),
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				   TCSAFLUSH, tcgetattr(), ECHO */
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#include <unistd.h>		/* struct termios, tcsetattr(),
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				   STDIN_FILENO, TCSAFLUSH,
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				   tcgetattr(), ECHO */
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#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
36
#include <stddef.h>		/* NULL, size_t, ssize_t */
13 by Björn Påhlsson
Added following support:
37
#include <sys/types.h>		/* ssize_t */
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
38
#include <stdlib.h>		/* EXIT_SUCCESS, EXIT_FAILURE,
79 by Teddy Hogeborn
* plugins.d/password-request.c (main): Include environment variables
39
				   getopt_long, getenv() */
13 by Björn Påhlsson
Added following support:
40
#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
42
				   stdout, getopt_long */
13 by Björn Påhlsson
Added following support:
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#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
46
#include <string.h> 		/* strlen, rindex, strncmp, strcmp */
24.1.26 by Björn Påhlsson
tally count of used symbols
47
#include <argp.h>		/* struct argp_option, struct
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				   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:
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53
volatile bool quit_now = false;
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
54
bool debug = false;
24.1.37 by Björn Påhlsson
name change for argp
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const char *argp_program_version = "password-prompt 1.0";
24.1.17 by Björn Påhlsson
passprompt
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
13 by Björn Påhlsson
Added following support:
57
37 by Teddy Hogeborn
Non-tested commit for merge purposes.
58
static void termination_handler(__attribute__((unused))int signum){
13 by Björn Påhlsson
Added following support:
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  quit_now = true;
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}
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int main(int argc, char **argv){
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
63
  ssize_t ret;
13 by Björn Påhlsson
Added following support:
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  size_t n;
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  struct termios t_new, t_old;
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  char *buffer = NULL;
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
67
  char *prefix = NULL;
13 by Björn Påhlsson
Added following support:
68
  int status = EXIT_SUCCESS;
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  struct sigaction old_action,
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    new_action = { .sa_handler = termination_handler,
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		   .sa_flags = 0 };
24.1.17 by Björn Påhlsson
passprompt
72
  {
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    struct argp_option options[] = {
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      { .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
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	.doc = "Prefix shown before the prompt", .group = 2 },
24.1.17 by Björn Påhlsson
passprompt
77
      { .name = "debug", .key = 128,
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	.doc = "Debug mode", .group = 3 },
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      { .name = NULL }
80
    };
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82
    error_t parse_opt (int key, char *arg, struct argp_state *state) {
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      /* Get the INPUT argument from `argp_parse', which we know is a
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	 pointer to our plugin list pointer. */
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      switch (key) {
86
      case 'p':
87
	prefix = arg;
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	break;
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      case 128:
90
	debug = true;
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	break;
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      case ARGP_KEY_ARG:
93
	argp_usage (state);
94
	break;
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      case ARGP_KEY_END:
96
	break;
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      default:
98
	return ARGP_ERR_UNKNOWN;
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      }
100
      return 0;
101
    }
102
  
103
    struct argp argp = { .options = options, .parser = parse_opt,
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			 .args_doc = "",
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
105
			 .doc = "Mandos password-prompt -- Read and"
106
			 " output a password" };
24.1.26 by Björn Påhlsson
tally count of used symbols
107
    ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
108
    if (ret == ARGP_ERR_UNKNOWN){
24.1.44 by Björn Påhlsson
Fixed unkown -> unknown
109
      fprintf(stderr, "Unknown error while parsing arguments\n");
24.1.26 by Björn Påhlsson
tally count of used symbols
110
      return EXIT_FAILURE;
111
    }
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
112
  }
24.1.17 by Björn Påhlsson
passprompt
113
    
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
114
  if (debug){
115
    fprintf(stderr, "Starting %s\n", argv[0]);
116
  }
117
  if (debug){
118
    fprintf(stderr, "Storing current terminal attributes\n");
119
  }
13 by Björn Påhlsson
Added following support:
120
  
121
  if (tcgetattr(STDIN_FILENO, &t_old) != 0){
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
122
    perror("tcgetattr");
13 by Björn Påhlsson
Added following support:
123
    return EXIT_FAILURE;
124
  }
125
  
126
  sigemptyset(&new_action.sa_mask);
127
  sigaddset(&new_action.sa_mask, SIGINT);
128
  sigaddset(&new_action.sa_mask, SIGHUP);
129
  sigaddset(&new_action.sa_mask, SIGTERM);
24.1.26 by Björn Påhlsson
tally count of used symbols
130
  ret = sigaction(SIGINT, NULL, &old_action);
131
  if(ret == -1){
132
    perror("sigaction");
133
    return EXIT_FAILURE;
134
  }
135
  if (old_action.sa_handler != SIG_IGN){
136
    ret = sigaction(SIGINT, &new_action, NULL);
137
    if(ret == -1){
138
      perror("sigaction");
139
      return EXIT_FAILURE;
140
    }
141
  }
142
  ret = sigaction(SIGHUP, NULL, &old_action);
143
  if(ret == -1){
144
    perror("sigaction");
145
    return EXIT_FAILURE;
146
  }
147
  if (old_action.sa_handler != SIG_IGN){
148
    ret = sigaction(SIGHUP, &new_action, NULL);
149
    if(ret == -1){
150
      perror("sigaction");
151
      return EXIT_FAILURE;
152
    }
153
  }
154
  ret = sigaction(SIGTERM, NULL, &old_action);
155
  if(ret == -1){
156
    perror("sigaction");
157
    return EXIT_FAILURE;
158
  }
159
  if (old_action.sa_handler != SIG_IGN){
160
    ret = sigaction(SIGTERM, &new_action, NULL);
161
    if(ret == -1){
162
      perror("sigaction");
163
      return EXIT_FAILURE;
164
    }
165
  }
166
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
167
  
168
  if (debug){
169
    fprintf(stderr, "Removing echo flag from terminal attributes\n");
170
  }
13 by Björn Påhlsson
Added following support:
171
  
172
  t_new = t_old;
173
  t_new.c_lflag &= ~ECHO;
174
  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
175
    perror("tcsetattr-echo");
176
    return EXIT_FAILURE;
177
  }
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
178
179
  if (debug){
180
    fprintf(stderr, "Waiting for input from stdin \n");
181
  }
13 by Björn Påhlsson
Added following support:
182
  while(true){
183
    if (quit_now){
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
184
      if(debug){
185
	fprintf(stderr, "Interrupted by signal, exiting.\n");
186
      }
13 by Björn Påhlsson
Added following support:
187
      status = EXIT_FAILURE;
188
      break;
189
    }
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
190
191
    if(prefix){
79 by Teddy Hogeborn
* plugins.d/password-request.c (main): Include environment variables
192
      fprintf(stderr, "%s ", prefix);
193
    }
194
    {
195
      const char *cryptsource = getenv("cryptsource");
196
      const char *crypttarget = getenv("crypttarget");
197
      const char *const prompt
198
	= "Enter passphrase to unlock the disk";
199
      if(cryptsource == NULL){
200
	if(crypttarget == NULL){
201
	  fprintf(stderr, "%s: ", prompt);
202
	} else {
203
	  fprintf(stderr, "%s (%s): ", prompt, crypttarget);
204
	}
205
      } else {
206
	if(crypttarget == NULL){
207
	  fprintf(stderr, "%s %s: ", prompt, cryptsource);
208
	} else {
209
	  fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
210
		  crypttarget);
211
	}
212
      }
213
    }
13 by Björn Påhlsson
Added following support:
214
    ret = getline(&buffer, &n, stdin);
215
    if (ret > 0){
216
      status = EXIT_SUCCESS;
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
217
      /* Make n = data size instead of allocated buffer size */
218
      n = (size_t)ret;
168 by Teddy Hogeborn
* initramfs-tools-hook: Use long options where available. Use only
219
      /* Strip final newline */
220
      if(n>0 and buffer[n-1] == '\n'){
221
	buffer[n-1] = '\0';	/* not strictly necessary */
222
	n--;
223
      }
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
224
      size_t written = 0;
225
      while(written < n){
226
	ret = write(STDOUT_FILENO, buffer + written, n - written);
227
	if(ret < 0){
228
	  perror("write");
229
	  status = EXIT_FAILURE;
230
	  break;
231
	}
232
	written += (size_t)ret;
233
      }
13 by Björn Påhlsson
Added following support:
234
      break;
235
    }
236
    if (ret < 0){
237
      if (errno != EINTR and not feof(stdin)){
238
	perror("getline");
239
	status = EXIT_FAILURE;
240
	break;
241
      }
242
    }
41 by Teddy Hogeborn
Merge.
243
    /* if(ret == 0), then the only sensible thing to do is to retry to
244
       read from stdin */
13 by Björn Påhlsson
Added following support:
245
    fputc('\n', stderr);
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
246
    if(debug and not quit_now){
247
      /* If quit_now is true, we were interrupted by a signal, and
248
	 will print that later, so no need to show this too. */
249
      fprintf(stderr, "getline() returned 0, retrying.\n");
250
    }
13 by Björn Påhlsson
Added following support:
251
  }
24.1.92 by Björn Påhlsson
Several memory leaks detected by valgrind fixed
252
253
  free(buffer);
41 by Teddy Hogeborn
Merge.
254
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
255
  if (debug){
256
    fprintf(stderr, "Restoring terminal attributes\n");
257
  }
13 by Björn Påhlsson
Added following support:
258
  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
259
    perror("tcsetattr+echo");
260
  }
41 by Teddy Hogeborn
Merge.
261
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
262
  if (debug){
110 by Teddy Hogeborn
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
263
    fprintf(stderr, "%s is exiting with status %d\n", argv[0],
264
	    status);
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
265
  }
167 by Teddy Hogeborn
* plugins.d/password-prompt.c (main): If successful, output an extra
266
  if(status == EXIT_SUCCESS){
267
    fputc('\n', stderr);
268
  }
13 by Björn Påhlsson
Added following support:
269
  
270
  return status;
271
}