/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
 * 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
 * 
237.7.447 by Teddy Hogeborn
Update copyright year to 2017
5
 * Copyright © 2008-2017 Teddy Hogeborn
6
 * Copyright © 2008-2017 Björn Påhlsson
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
7
 * 
237.7.455 by Teddy Hogeborn
Alter copyright notices slightly. Actual license is unchanged!
8
 * This file is part of Mandos.
9
 * 
10
 * Mandos is free software: you can redistribute it and/or modify it
11
 * under the terms of the GNU General Public License as published by
12
 * the Free Software Foundation, either version 3 of the License, or
13
 * (at your option) any later version.
14
 * 
15
 * Mandos is distributed in the hope that it will be useful, but
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
16
 * WITHOUT ANY WARRANTY; without even the implied warranty of
17
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18
 * General Public License for more details.
19
 * 
20
 * You should have received a copy of the GNU General Public License
237.7.455 by Teddy Hogeborn
Alter copyright notices slightly. Actual license is unchanged!
21
 * along with Mandos.  If not, see <http://www.gnu.org/licenses/>.
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
22
 * 
237.11.2 by Teddy Hogeborn
Change "fukt.bsnet.se" to "recompile.se" throughout.
23
 * Contact the authors at <mandos@recompile.se>.
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
24
 */
25
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
26
#define _GNU_SOURCE		/* TEMP_FAILURE_RETRY() */
237.7.279 by Teddy Hogeborn
askpass-fifo: Lower privileges after opening FIFO.
27
#include <sys/types.h>		/* uid_t, gid_t, ssize_t */
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
28
#include <sys/stat.h>		/* mkfifo(), S_IRUSR, S_IWUSR */
29
#include <iso646.h>		/* and */
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
30
#include <errno.h>		/* errno, EACCES, ENOTDIR, ELOOP,
31
				   ENAMETOOLONG, ENOSPC, EROFS,
32
				   ENOENT, EEXIST, EFAULT, EMFILE,
33
				   ENFILE, ENOMEM, EBADF, EINVAL, EIO,
34
				   EISDIR, EFBIG */
24.1.155 by Björn Påhlsson
mandos server: Added debuglevel that adjust at what level information
35
#include <error.h>		/* error() */
237.7.33 by Teddy Hogeborn
Merge from Björn.
36
#include <stdio.h>		/* fprintf(), vfprintf(),
37
				   vasprintf() */
237.2.118 by Teddy Hogeborn
* mandos: White-space fixes only.
38
#include <stdlib.h>		/* EXIT_FAILURE, NULL, size_t, free(),
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
39
				   realloc(), EXIT_SUCCESS */
40
#include <fcntl.h>		/* open(), O_RDONLY */
41
#include <unistd.h>		/* read(), close(), write(),
42
				   STDOUT_FILENO */
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
43
#include <sysexits.h>		/* EX_OSERR, EX_OSFILE,
44
				   EX_UNAVAILABLE, EX_IOERR */
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
45
#include <string.h> 		/* strerror() */
46
#include <stdarg.h>		/* va_list, va_start(), ... */
47
237.7.279 by Teddy Hogeborn
askpass-fifo: Lower privileges after opening FIFO.
48
uid_t uid = 65534;
49
gid_t gid = 65534;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
50
51
/* Function to use when printing errors */
237.7.81 by teddy at bsnet
* plugins.d/splashy.c (error_plus): Check format string.
52
__attribute__((format (gnu_printf, 3, 4)))
237.7.33 by Teddy Hogeborn
Merge from Björn.
53
void error_plus(int status, int errnum, const char *formatstring,
54
		...){
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
55
  va_list ap;
56
  char *text;
57
  int ret;
58
  
59
  va_start(ap, formatstring);
60
  ret = vasprintf(&text, formatstring, ap);
237.7.218 by Teddy Hogeborn
White space fix: change "if (" to "if(" in C code.
61
  if(ret == -1){
237.7.33 by Teddy Hogeborn
Merge from Björn.
62
    fprintf(stderr, "Mandos plugin %s: ",
63
	    program_invocation_short_name);
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
64
    vfprintf(stderr, formatstring, ap);
65
    fprintf(stderr, ": ");
66
    fprintf(stderr, "%s\n", strerror(errnum));
67
    error(status, errno, "vasprintf while printing error");
68
    return;
69
  }
70
  fprintf(stderr, "Mandos plugin ");
71
  error(status, errnum, "%s", text);
72
  free(text);
73
}
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
74
75
int main(__attribute__((unused))int argc,
76
	 __attribute__((unused))char **argv){
77
  int ret = 0;
78
  ssize_t sret;
79
  
237.7.279 by Teddy Hogeborn
askpass-fifo: Lower privileges after opening FIFO.
80
  uid = getuid();
81
  gid = getgid();
82
  
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
83
  /* Create FIFO */
84
  const char passfifo[] = "/lib/cryptsetup/passfifo";
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
85
  ret = mkfifo(passfifo, S_IRUSR | S_IWUSR);
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
86
  if(ret == -1){
87
    int e = errno;
88
    switch(e){
89
    case EACCES:
90
    case ENOTDIR:
91
    case ELOOP:
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
92
      error_plus(EX_OSFILE, errno, "mkfifo");
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
93
    case ENAMETOOLONG:
94
    case ENOSPC:
95
    case EROFS:
96
    default:
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
97
      error_plus(EX_OSERR, errno, "mkfifo");
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
98
    case ENOENT:
237.7.27 by Teddy Hogeborn
* plugins.d/askpass-fifo.c (main): Don't print message if FIFO exists.
99
      /* no "/lib/cryptsetup"? */
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
100
      error_plus(EX_UNAVAILABLE, errno, "mkfifo");
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
101
    case EEXIST:
102
      break;			/* not an error */
103
    }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
104
  }
105
  
106
  /* Open FIFO */
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
107
  int fifo_fd = open(passfifo, O_RDONLY);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
108
  if(fifo_fd == -1){
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
109
    int e = errno;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
110
    error_plus(0, errno, "open");
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
111
    switch(e){
112
    case EACCES:
113
    case ENOENT:
114
    case EFAULT:
115
      return EX_UNAVAILABLE;
116
    case ENAMETOOLONG:
117
    case EMFILE:
118
    case ENFILE:
119
    case ENOMEM:
120
    default:
121
      return EX_OSERR;
122
    case ENOTDIR:
123
    case ELOOP:
124
      return EX_OSFILE;
125
    }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
126
  }
127
  
237.7.279 by Teddy Hogeborn
askpass-fifo: Lower privileges after opening FIFO.
128
  /* Lower group privileges  */
129
  if(setgid(gid) == -1){
130
    error_plus(0, errno, "setgid");
131
  }
132
  
133
  /* Lower user privileges */
134
  if(setuid(uid) == -1){
135
    error_plus(0, errno, "setuid");
136
  }
137
  
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
138
  /* Read from FIFO */
139
  char *buf = NULL;
140
  size_t buf_len = 0;
141
  {
142
    size_t buf_allocated = 0;
143
    const size_t blocksize = 1024;
237.2.126 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
144
    do {
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
145
      if(buf_len + blocksize > buf_allocated){
146
	char *tmp = realloc(buf, buf_allocated + blocksize);
147
	if(tmp == NULL){
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
148
	  error_plus(0, errno, "realloc");
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
149
	  free(buf);
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
150
	  return EX_OSERR;
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
151
	}
152
	buf = tmp;
153
	buf_allocated += blocksize;
154
      }
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
155
      sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
156
      if(sret == -1){
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
157
	int e = errno;
158
	free(buf);
159
	errno = e;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
160
	error_plus(0, errno, "read");
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
161
	switch(e){
162
	case EBADF:
163
	case EFAULT:
164
	case EINVAL:
165
	default:
166
	  return EX_OSERR;
167
	case EIO:
168
	  return EX_IOERR;
169
	case EISDIR:
170
	  return EX_UNAVAILABLE;
171
	}
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
172
      }
173
      buf_len += (size_t)sret;
237.2.126 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
174
    } while(sret != 0);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
175
  }
176
  
177
  /* Close FIFO */
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
178
  close(fifo_fd);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
179
  
180
  /* Print password to stdout */
181
  size_t written = 0;
182
  while(written < buf_len){
237.2.132 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
183
    sret = write(STDOUT_FILENO, buf + written, buf_len - written);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
184
    if(sret == -1){
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
185
      int e = errno;
186
      free(buf);
187
      errno = e;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
188
      error_plus(0, errno, "write");
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
189
      switch(e){
190
      case EBADF:
191
      case EFAULT:
192
      case EINVAL:
193
	return EX_OSFILE;
194
      case EFBIG:
195
      case EIO:
196
      case ENOSPC:
197
      default:
198
	return EX_IOERR;
199
      }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
200
    }
201
    written += (size_t)sret;
202
  }
203
  free(buf);
204
  
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
205
  ret = close(STDOUT_FILENO);
206
  if(ret == -1){
207
    int e = errno;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
208
    error_plus(0, errno, "close");
237.2.153 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
209
    switch(e){
210
    case EBADF:
211
      return EX_OSFILE;
212
    case EIO:
213
    default:
214
      return EX_IOERR;
215
    }
216
  }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
217
  return EXIT_SUCCESS;
218
}