/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
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/*  -*- coding: utf-8 -*- */
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/*
261 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Fix name in header.
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 * 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
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 * 
679 by Teddy Hogeborn
Update copyright year.
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 * Copyright © 2008-2014 Teddy Hogeborn
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 * Copyright © 2008-2014 Björn Påhlsson
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
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 * 
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 * This program is free software: you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation, either version 3 of the
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 * License, or (at your option) any later version.
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 * 
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 * This program is distributed in the hope that it will be useful, but
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * General Public License for more details.
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 * 
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see
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 * <http://www.gnu.org/licenses/>.
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 * 
505.1.2 by Teddy Hogeborn
Change "fukt.bsnet.se" to "recompile.se" throughout.
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 * Contact the authors at <mandos@recompile.se>.
237.1.2 by Teddy Hogeborn
Further steps towards a D-Bus server interface, plus minor syntax
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 */
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214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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#define _GNU_SOURCE		/* TEMP_FAILURE_RETRY() */
731 by Teddy Hogeborn
askpass-fifo: Lower privileges after opening FIFO.
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#include <sys/types.h>		/* uid_t, gid_t, ssize_t */
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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#include <sys/stat.h>		/* mkfifo(), S_IRUSR, S_IWUSR */
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#include <iso646.h>		/* and */
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
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#include <errno.h>		/* errno, EACCES, ENOTDIR, ELOOP,
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				   ENAMETOOLONG, ENOSPC, EROFS,
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				   ENOENT, EEXIST, EFAULT, EMFILE,
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				   ENFILE, ENOMEM, EBADF, EINVAL, EIO,
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				   EISDIR, EFBIG */
24.1.155 by Björn Påhlsson
mandos server: Added debuglevel that adjust at what level information
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#include <error.h>		/* error() */
485 by Teddy Hogeborn
Merge from Björn.
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#include <stdio.h>		/* fprintf(), vfprintf(),
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				   vasprintf() */
355 by Teddy Hogeborn
* mandos: White-space fixes only.
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#include <stdlib.h>		/* EXIT_FAILURE, NULL, size_t, free(),
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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				   realloc(), EXIT_SUCCESS */
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#include <fcntl.h>		/* open(), O_RDONLY */
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#include <unistd.h>		/* read(), close(), write(),
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				   STDOUT_FILENO */
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
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#include <sysexits.h>		/* EX_OSERR, EX_OSFILE,
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				   EX_UNAVAILABLE, EX_IOERR */
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
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#include <string.h> 		/* strerror() */
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#include <stdarg.h>		/* va_list, va_start(), ... */
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731 by Teddy Hogeborn
askpass-fifo: Lower privileges after opening FIFO.
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uid_t uid = 65534;
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gid_t gid = 65534;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
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/* Function to use when printing errors */
533 by teddy at bsnet
* plugins.d/splashy.c (error_plus): Check format string.
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__attribute__((format (gnu_printf, 3, 4)))
485 by Teddy Hogeborn
Merge from Björn.
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void error_plus(int status, int errnum, const char *formatstring,
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		...){
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
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  va_list ap;
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  char *text;
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  int ret;
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  va_start(ap, formatstring);
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  ret = vasprintf(&text, formatstring, ap);
670 by Teddy Hogeborn
White space fix: change "if (" to "if(" in C code.
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  if(ret == -1){
485 by Teddy Hogeborn
Merge from Björn.
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    fprintf(stderr, "Mandos plugin %s: ",
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	    program_invocation_short_name);
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
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    vfprintf(stderr, formatstring, ap);
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    fprintf(stderr, ": ");
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    fprintf(stderr, "%s\n", strerror(errnum));
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    error(status, errno, "vasprintf while printing error");
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    return;
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  }
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  fprintf(stderr, "Mandos plugin ");
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  error(status, errnum, "%s", text);
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  free(text);
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}
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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int main(__attribute__((unused))int argc,
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	 __attribute__((unused))char **argv){
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  int ret = 0;
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  ssize_t sret;
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731 by Teddy Hogeborn
askpass-fifo: Lower privileges after opening FIFO.
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  uid = getuid();
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  gid = getgid();
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214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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  /* Create FIFO */
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  const char passfifo[] = "/lib/cryptsetup/passfifo";
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
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  ret = mkfifo(passfifo, S_IRUSR | S_IWUSR);
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
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  if(ret == -1){
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    int e = errno;
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    switch(e){
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    case EACCES:
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    case ENOTDIR:
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    case ELOOP:
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
91
      error_plus(EX_OSFILE, errno, "mkfifo");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
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    case ENAMETOOLONG:
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    case ENOSPC:
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    case EROFS:
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    default:
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
96
      error_plus(EX_OSERR, errno, "mkfifo");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
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    case ENOENT:
479 by Teddy Hogeborn
* plugins.d/askpass-fifo.c (main): Don't print message if FIFO exists.
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      /* no "/lib/cryptsetup"? */
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
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      error_plus(EX_UNAVAILABLE, errno, "mkfifo");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
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    case EEXIST:
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      break;			/* not an error */
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    }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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  }
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  /* Open FIFO */
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
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  int fifo_fd = open(passfifo, O_RDONLY);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
107
  if(fifo_fd == -1){
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
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    int e = errno;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
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    error_plus(0, errno, "open");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
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    switch(e){
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    case EACCES:
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    case ENOENT:
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    case EFAULT:
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      return EX_UNAVAILABLE;
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    case ENAMETOOLONG:
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    case EMFILE:
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    case ENFILE:
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    case ENOMEM:
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    default:
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      return EX_OSERR;
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    case ENOTDIR:
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    case ELOOP:
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      return EX_OSFILE;
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    }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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  }
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731 by Teddy Hogeborn
askpass-fifo: Lower privileges after opening FIFO.
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  /* Lower group privileges  */
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  if(setgid(gid) == -1){
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    error_plus(0, errno, "setgid");
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  }
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  /* Lower user privileges */
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  if(setuid(uid) == -1){
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    error_plus(0, errno, "setuid");
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  }
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214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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  /* Read from FIFO */
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  char *buf = NULL;
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  size_t buf_len = 0;
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  {
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    size_t buf_allocated = 0;
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    const size_t blocksize = 1024;
363 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
143
    do {
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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      if(buf_len + blocksize > buf_allocated){
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	char *tmp = realloc(buf, buf_allocated + blocksize);
146
	if(tmp == NULL){
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
147
	  error_plus(0, errno, "realloc");
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
148
	  free(buf);
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
149
	  return EX_OSERR;
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
150
	}
151
	buf = tmp;
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	buf_allocated += blocksize;
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      }
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
154
      sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
155
      if(sret == -1){
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
156
	int e = errno;
157
	free(buf);
158
	errno = e;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
159
	error_plus(0, errno, "read");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
160
	switch(e){
161
	case EBADF:
162
	case EFAULT:
163
	case EINVAL:
164
	default:
165
	  return EX_OSERR;
166
	case EIO:
167
	  return EX_IOERR;
168
	case EISDIR:
169
	  return EX_UNAVAILABLE;
170
	}
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
171
      }
172
      buf_len += (size_t)sret;
363 by Teddy Hogeborn
* plugin-runner.c: Minor stylistic changes.
173
    } while(sret != 0);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
174
  }
175
  
176
  /* Close FIFO */
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
177
  close(fifo_fd);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
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179
  /* Print password to stdout */
180
  size_t written = 0;
181
  while(written < buf_len){
369 by Teddy Hogeborn
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
182
    sret = write(STDOUT_FILENO, buf + written, buf_len - written);
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
183
    if(sret == -1){
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
184
      int e = errno;
185
      free(buf);
186
      errno = e;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
187
      error_plus(0, errno, "write");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
188
      switch(e){
189
      case EBADF:
190
      case EFAULT:
191
      case EINVAL:
192
	return EX_OSFILE;
193
      case EFBIG:
194
      case EIO:
195
      case ENOSPC:
196
      default:
197
	return EX_IOERR;
198
      }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
199
    }
200
    written += (size_t)sret;
201
  }
202
  free(buf);
203
  
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
204
  ret = close(STDOUT_FILENO);
205
  if(ret == -1){
206
    int e = errno;
24.1.174 by Björn Påhlsson
* Makefile (CFLAGS): Added "-lrt" to include real time library.
207
    error_plus(0, errno, "close");
390 by Teddy Hogeborn
* plugins.d/askpass-fifo.c: Do close(STDOUT_FILENO) before exiting to
208
    switch(e){
209
    case EBADF:
210
      return EX_OSFILE;
211
    case EIO:
212
    default:
213
      return EX_IOERR;
214
    }
215
  }
214 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
216
  return EXIT_SUCCESS;
217
}