/mandos/trunk

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/trunk
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
1
/*  -*- coding: utf-8 -*- */
2
/*
261 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Fix name in header.
3
 * Askpass-FIFO - Read a password from a FIFO and output it
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
4
 * 
466 by Teddy Hogeborn
Update copyright year to "2011" wherever appropriate.
5
 * Copyright © 2008-2011 Teddy Hogeborn
6
 * Copyright © 2008-2011 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
 * 
363 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
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
25
#define _GNU_SOURCE		/* TEMP_FAILURE_RETRY() */
26
#include <sys/types.h>		/* ssize_t */
27
#include <sys/stat.h>		/* mkfifo(), S_IRUSR, S_IWUSR */
28
#include <iso646.h>		/* and */
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
29
#include <errno.h>		/* errno, EACCES, ENOTDIR, ELOOP,
30
				   ENAMETOOLONG, ENOSPC, EROFS,
31
				   ENOENT, EEXIST, EFAULT, EMFILE,
32
				   ENFILE, ENOMEM, EBADF, EINVAL, EIO,
33
				   EISDIR, EFBIG */
24.1.155 by Björn Påhlsson
mandos server: Added debuglevel that adjust at what level information
34
#include <error.h>		/* error() */
355 by Teddy Hogeborn
* mandos: White-space fixes only.
35
#include <stdlib.h>		/* EXIT_FAILURE, NULL, size_t, free(),
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
36
				   realloc(), EXIT_SUCCESS */
37
#include <fcntl.h>		/* open(), O_RDONLY */
38
#include <unistd.h>		/* read(), close(), write(),
39
				   STDOUT_FILENO */
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
40
#include <sysexits.h>		/* EX_OSERR, EX_OSFILE,
41
				   EX_UNAVAILABLE, EX_IOERR */
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
42
43
44
int main(__attribute__((unused))int argc,
45
	 __attribute__((unused))char **argv){
46
  int ret = 0;
47
  ssize_t sret;
48
  
49
  /* Create FIFO */
50
  const char passfifo[] = "/lib/cryptsetup/passfifo";
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
51
  ret = mkfifo(passfifo, S_IRUSR | S_IWUSR);
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
52
  if(ret == -1){
53
    int e = errno;
54
    switch(e){
55
    case EACCES:
56
    case ENOTDIR:
57
    case ELOOP:
479 by Teddy Hogeborn
* plugins.d/askpass-fifo.c (main): Don't print message if FIFO exists.
58
      error(EX_OSFILE, errno, "mkfifo");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
59
    case ENAMETOOLONG:
60
    case ENOSPC:
61
    case EROFS:
62
    default:
479 by Teddy Hogeborn
* plugins.d/askpass-fifo.c (main): Don't print message if FIFO exists.
63
      error(EX_OSERR, errno, "mkfifo");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
64
    case ENOENT:
479 by Teddy Hogeborn
* plugins.d/askpass-fifo.c (main): Don't print message if FIFO exists.
65
      /* no "/lib/cryptsetup"? */
66
      error(EX_UNAVAILABLE, errno, "mkfifo");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
67
    case EEXIST:
68
      break;			/* not an error */
69
    }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
70
  }
71
  
72
  /* Open FIFO */
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
73
  int fifo_fd = open(passfifo, O_RDONLY);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
74
  if(fifo_fd == -1){
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
75
    int e = errno;
24.1.155 by Björn Påhlsson
mandos server: Added debuglevel that adjust at what level information
76
    error(0, errno, "open");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
77
    switch(e){
78
    case EACCES:
79
    case ENOENT:
80
    case EFAULT:
81
      return EX_UNAVAILABLE;
82
    case ENAMETOOLONG:
83
    case EMFILE:
84
    case ENFILE:
85
    case ENOMEM:
86
    default:
87
      return EX_OSERR;
88
    case ENOTDIR:
89
    case ELOOP:
90
      return EX_OSFILE;
91
    }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
92
  }
93
  
94
  /* Read from FIFO */
95
  char *buf = NULL;
96
  size_t buf_len = 0;
97
  {
98
    size_t buf_allocated = 0;
99
    const size_t blocksize = 1024;
363 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
100
    do {
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
101
      if(buf_len + blocksize > buf_allocated){
102
	char *tmp = realloc(buf, buf_allocated + blocksize);
103
	if(tmp == NULL){
24.1.155 by Björn Påhlsson
mandos server: Added debuglevel that adjust at what level information
104
	  error(0, errno, "realloc");
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
105
	  free(buf);
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
106
	  return EX_OSERR;
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
107
	}
108
	buf = tmp;
109
	buf_allocated += blocksize;
110
      }
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
111
      sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
112
      if(sret == -1){
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
113
	int e = errno;
114
	free(buf);
115
	errno = e;
24.1.155 by Björn Påhlsson
mandos server: Added debuglevel that adjust at what level information
116
	error(0, errno, "read");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
117
	switch(e){
118
	case EBADF:
119
	case EFAULT:
120
	case EINVAL:
121
	default:
122
	  return EX_OSERR;
123
	case EIO:
124
	  return EX_IOERR;
125
	case EISDIR:
126
	  return EX_UNAVAILABLE;
127
	}
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
128
      }
129
      buf_len += (size_t)sret;
363 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
130
    } while(sret != 0);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
131
  }
132
  
133
  /* Close FIFO */
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
134
  close(fifo_fd);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
135
  
136
  /* Print password to stdout */
137
  size_t written = 0;
138
  while(written < buf_len){
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
139
    sret = write(STDOUT_FILENO, buf + written, buf_len - written);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
140
    if(sret == -1){
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
141
      int e = errno;
142
      free(buf);
143
      errno = e;
24.1.155 by Björn Påhlsson
mandos server: Added debuglevel that adjust at what level information
144
      error(0, errno, "write");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
145
      switch(e){
146
      case EBADF:
147
      case EFAULT:
148
      case EINVAL:
149
	return EX_OSFILE;
150
      case EFBIG:
151
      case EIO:
152
      case ENOSPC:
153
      default:
154
	return EX_IOERR;
155
      }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
156
    }
157
    written += (size_t)sret;
158
  }
159
  free(buf);
160
  
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
161
  ret = close(STDOUT_FILENO);
162
  if(ret == -1){
163
    int e = errno;
24.1.155 by Björn Påhlsson
mandos server: Added debuglevel that adjust at what level information
164
    error(0, errno, "close");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
165
    switch(e){
166
    case EBADF:
167
      return EX_OSFILE;
168
    case EIO:
169
    default:
170
      return EX_IOERR;
171
    }
172
  }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
173
  return EXIT_SUCCESS;
174
}