source: trunk/run_email2trac.c @ 485

Last change on this file since 485 was 318, checked in by bas, 11 years ago

Fixed an segv in run_email2trac.c with the new python_egg cache setting. see #174

  • Property svn:keywords set to Id
File size: 3.7 KB
Line 
1/*
2        run_email2trac.c
3        Authors: Bas van der Vlies, Walter de Jong and Michel Jouvin
4        SVN Info:
5                $Id: run_email2trac.c 318 2010-02-15 14:27:14Z bas $
6
7        Only nobody can become the user www-data. Postfix uses this
8        user to start an program
9
10# Copyright (C) 2002
11#
12# This file is part of the email2trac utils
13#
14# This program is free software; you can redistribute it and/or modify it
15# under the terms of the GNU General Public License as published by the
16# Free Software Foundation; either version 2, or (at your option) any
17# later version.
18#
19# This program is distributed in the hope that it will be useful,
20# but WITHOUT ANY WARRANTY; without even the implied warranty of
21# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22# GNU General Public License for more details.
23#
24# You should have received a copy of the GNU General Public License
25# along with this program; if not, write to the Free Software
26# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
27#
28*/
29#include <stdlib.h>
30#include <unistd.h>
31#include <pwd.h>
32#include <sys/stat.h>
33#include <string.h>
34#include <stdio.h>
35#include <limits.h>
36
37#include "run_email2trac.h"
38
39#ifndef DEBUG
40#define DEBUG 0
41#endif
42
43void check_username(char *name)
44{
45  if ( strlen(name) > 30 ) {
46          if ( DEBUG ) printf("MTA_USERNAME is to large; %s\n", name);
47          exit(-1);
48  }
49}
50
51int main(int argc, char** argv) {
52
53  int i,j;
54  int caller = getuid();
55  int status;
56
57  char   **trac_script_args;
58  char   *python_egg_cache = NULL;
59  struct passwd *TRAC; 
60  struct passwd *MTA;
61  struct stat script_attrs;
62  const char *trac_script = TRAC_SCRIPT_PATH "/" TRAC_SCRIPT_NAME;
63 
64  /*
65  printf("trac_script = %s\n", trac_script);
66  */
67
68  /* First copy arguments passed to the wrapper as scripts arguments
69     after filtering out some of the possible script options */
70
71  trac_script_args = (char**) malloc((argc+1)*sizeof(char*));
72  if (trac_script_args == NULL) {
73    if ( DEBUG ) printf("malloc failed\n");
74    return 1;
75  }
76  trac_script_args[0] = TRAC_SCRIPT_NAME;
77  for (i=j=1; i<argc; i++) {
78    if ( (strcmp(argv[i],"--file") == 0) || 
79         (strcmp(argv[i],"-f") == 0) ) {
80      i++;
81      continue;
82    }
83    else if ( (strcmp(argv[i],"--eggcache") == 0) ||
84         (strcmp(argv[i],"-e") == 0) ) {
85      i++;
86      python_egg_cache = argv[i];
87      continue;
88    }
89   
90    trac_script_args[j] = argv[i];
91    j++;
92  }
93  trac_script_args[j] = NULL;
94
95  /* Check caller */
96  check_username(MTA_USER);
97  MTA = getpwnam(MTA_USER);
98
99  if ( MTA == NULL ) {
100    if ( DEBUG ) printf("Invalid MTA user (%s)\n", MTA_USER);
101    return -3;     /* 253 : MTA user not found */
102  }
103
104  if ( caller !=  MTA->pw_uid ) {
105    if ( DEBUG ) printf("Invalid caller UID (%d)\n",caller);
106    return -2;     /* 254 : Invalid caller */
107  }
108 
109  /* set UID/GID to Trac (or apache) user */
110  check_username(TRAC_USER);
111  if ( TRAC = getpwnam(TRAC_USER) ) {
112    if (setgid(TRAC->pw_gid) || setuid(TRAC->pw_uid)) {
113      if ( DEBUG ) printf("setgid or setuid failed\n");
114      return -5;
115    }
116  } else {
117    if ( DEBUG ) printf("Invalid Trac user (%s)\n",TRAC_USER);
118    return -3;     /* 253 : Trac user not found */
119  }
120         
121  /* Check that script exists */
122  if ( stat(trac_script,&script_attrs) ) {
123    if ( DEBUG ) printf("Script not found (%s)\n",trac_script);
124    return -4;    /* 252 : script not found */
125  }
126 
127  /* Set PYTHON_EGG_CACHE env variable if we have been told to do so */
128  if ( python_egg_cache != NULL ) {
129    setenv("PYTHON_EGG_CACHE",python_egg_cache ,1);
130  }
131
132  /* Execute script */
133  status = execv(trac_script, trac_script_args);
134 
135  if ( DEBUG ) printf("Script %s execution failure (error=%d). Check permission and interpreter path.\n",trac_script,status);
136  return -1;     /* 255 : should never reach this point */
137
138}
139
140/* EOB */
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