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first commit

This commit is contained in:
Daniel Tartavel 2020-05-04 17:22:24 +02:00
parent ca55a7919d
commit 82c0754829

238
main.c
View File

@ -1,8 +1,240 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
int main(int argc, char *argv[])
#define HOSTNAME "lalis"
int isinarray( int pid, int array[], int n )
{
puts("Hello, World!");
return 0;
//if (n == 0) return 0;
int x;
for(x=1;x<=n;x++)
{
if( pid == array[x])
{
return x;
}
}
return 0;
}
int getcmdline( int ppid, char cmdline[], char cmd[], char user[] )
{
FILE *fh1;
char child_path[128];
char str[1024];
char * pch;
int child_pid;
int flag = 0;
int r;
int x = 0;
int pid = ppid;
while ( flag == 0)
{
sprintf( child_path, "/proc/%d/task/%d/children", pid,pid);
if ( (fh1 = fopen( child_path, "r" )) == NULL)
{
perror(child_path);
return 3;
}
r = fscanf( fh1, "%i", &child_pid );
if ( r != -1 )
{
pid = child_pid;
}else
{
flag = 1;
}
fclose(fh1);
}
sprintf( child_path, "/proc/%d/cmdline", pid );
if ( (fh1= fopen( child_path, "r" )) == NULL)
{
perror(child_path);
return 4;
}
fgets( str, 1024, fh1);
flag = 0;
while ( flag == 0 )
{
if ( (int) str[x] == 0 )
{
if ( (int) str[x+1] != 0 )
{
str[x] = ' ';
}else
{
flag = 1;
}
}
x++;
}
sprintf(cmdline, "%s", str);
fclose(fh1);
sprintf( child_path, "/proc/%d/comm", pid );
if ( (fh1= fopen(child_path, "r" )) == NULL)
{
perror(child_path);
return 5;
}
fscanf( fh1, "%s", cmd );
fclose(fh1);
sprintf( child_path, "/proc/%d/environ", pid );
if ( (fh1= fopen(child_path, "r" )) == NULL)
{
perror(child_path);
return 5;
}
fscanf( fh1, "%s", str);
pch = strtok( str, "=" );
pch = strtok( NULL , "=" );
sprintf( user, "%s", pch);
fclose(fh1);
return 0;
}
int main()
{
FILE *fh;
FILE *fh1;
int id;
int pid;
int x=0;
int r;
int i;
int j;
int start =1;
int childrens[10];
int flag[10];
char proc_path[128];
char commande[] = "/usr/local/bin/send_sms";
char logfile[] = "/var/log/sshdetect.log";
char cmd[24];
char cmdline[1000];
char user[24];
char str[1024];
char date[60];
time_t now ;
time( &now );
sprintf( date, "%s", ctime(&now));
date[strlen(date)-1] = 0;
if ( (fh = fopen(logfile, "a")) == NULL)
{
perror(logfile);
return 1;
}
fprintf(fh, "%s: Démarrage de sshdetect", date);
fclose(fh);
sprintf( str, "%s \"%s - %s: Démarrage de sshdetect\"", commande, HOSTNAME, date );
id=fork();
if(id == 0)
{
r = system( str );
exit(r);
}else if( id<0 )
{
printf("erreur de création du fork: %s", str);
}
while (1)
{
// get the sshd process ID (PID)
if ( (fh = fopen("/run/sshd.pid", "r" )) == NULL)
{
perror("/run/sshd.pid");
return 1;
}
if ( fscanf(fh, "%i", &pid) == 0)
{
printf("erreur fscanf: /run/sshd.pid" );
return 10;
}
fclose(fh);
//printf("%i", pid);
//get the list of children
sprintf( proc_path, "/proc/%d/task/%d/children", pid,pid);
//printf(" %s", proc_path);
if ((fh = fopen( proc_path, "r")) == NULL)
{
perror(proc_path);
return 1;
}
while(fscanf(fh, "%i", &pid) > 0)
{
r = isinarray(pid, childrens, x);
if( r == 0 )
{
getcmdline( pid, cmdline, cmd, user );
if( strcmp( cmd, "sshd") != 0 )
{
x++;
childrens[x] = pid;
flag[x] = 1;
time( &now );
sprintf( date, "%s", ctime(&now));
date[strlen(date)-1] = 0;
sprintf( str, "%s \"%s: %s s'est connecté le %s avec la commande: %s %s\"", commande, HOSTNAME, user, date, cmd, cmdline );
id=fork();
if(id>0)
{
if ( (fh1 = fopen(logfile, "a")) == NULL)
{
perror(logfile);
return 7;
}
if (start == 1)
{
fprintf(fh1, "%s: %s Connecté - %s %s", date, user, cmd, cmdline);
}else
{
fprintf(fh1, "%s: Connexion de %s\n#%s# %s\n", date, user, cmd, cmdline);
}
fclose(fh1);
}else if (id<0)
{
printf("erreur de création du fork: %s", str);
}else
{
if (start != 1)
{
//printf("%s\n", str);
r = system( str );
}
exit (r);
}
}
}else
{
flag[r] = 1;
}
}
for(i=1;i<=x;i++)
{
if (flag[i] == 0 )
{
printf("Session %d terminée\n", childrens[i]);
for( j=i; j<x; j++ )
{
childrens[j] = childrens[j+1];
flag[j] = flag[j+1];
}
i--;
x--;
}else
{
flag[i] = 0;
}
}
fclose(fh);
sleep(2);
start = 0;
}
return 0;
}