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/*
*-----------------------------------------------------------------------------
*
* Peekaboo Extended Email Attachment Behavior Observation Owl
*
* chown2me.c
*
* Copyright (C) 2016-2018 science + computing ag
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*
*-----------------------------------------------------------------------------
*
*
* Changes ownership of every directory entry within /tmp that starts with
* "amavis-" to user and group of the user who runs this program.
*
* Deletion of files remains in sample.py since only it knows what to delete and
* no arguments should be passed to this program for security reasons.
*
*
* Compile with
*
* make chown2me
*
* Run the following command as root to set capability to allow chown
*
* sudo setcap cap_chown+ep chown2me
*
*/
#include <unistd.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
int main(){
DIR *d;
struct dirent *dir;
char* path = "/tmp/";
char* prefix = "amavis-";
char test[strlen(prefix)+1];
int uid = getuid();
int gid = getgid();
FILE * logfile_fd = fopen("chown2me.log", "w+");
if (logfile_fd == NULL)
{
perror("Unable to open / write to logfile");
return 1;
}
fprintf(logfile_fd, "Changing to %i:%i\n", uid, gid);
d = opendir(path);
if (d) {
while ((dir = readdir(d)) != NULL) {
// copy prefix to test string
strncpy(test, dir->d_name, strlen(prefix));
// compare if prefix equals test
if (strcmp(prefix, test) == 0) {
char fullpath[strlen(path)+strlen(dir->d_name)+1];
fullpath[0]='\0';
strcat(fullpath,path);
strcat(fullpath,dir->d_name);
fprintf(logfile_fd, "chown for %s\n", fullpath);
// change owner to 1000
int res = lchown(fullpath, uid, gid);
if (res != 0){
perror("chown");
return res;
}
}
}
closedir(d);
fclose(logfile_fd);
}
else {
perror("opendir");
return 5;
}
return 0;
}
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