354 lines
6.8 KiB
C
354 lines
6.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <utmp.h>
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#define HOSTNAME "lalis"
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//test if pid is in lsit of known sshd processus
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int isinarray( int pid, int array[], int n )
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{
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//if (n == 0) return 0;
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int x;
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for(x=1;x<=n;x++)
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{
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if( pid == array[x])
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{
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return x;
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}
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} return 0;
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}
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//get utmp datas
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void getutmp( int pid, char user[], char host_ip[], char host_ipv6[], time_t * time )
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{
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struct utmp * utmp;
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short int ipv6_1;
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short int ipv6_2;
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short int ipv4;
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int x;
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char str[6];
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setutent();
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while ( (utmp = getutent()) != NULL )
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{
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if ( utmp->ut_pid == pid )
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{
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sprintf(user, "%s", utmp->ut_user); //got user login
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sprintf(host_ip, "%s", utmp->ut_host); //got ip of origin
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if((utmp->ut_addr_v6[1] && utmp->ut_addr_v6[2] && utmp->ut_addr_v6[3]) == 0)
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{
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ipv4 = (utmp->ut_addr_v6[0] & 0x00000000ff000000) ;
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ipv4 >>= 6;
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sprintf( str, "%x.", ipv4);
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strcat(host_ip, str);
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ipv4 = (utmp->ut_addr_v6[0] & 0x0000000000ff0000) >> 4;
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sprintf( str, "%x.", ipv4);
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strcat(host_ip, str);
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ipv4 = (utmp->ut_addr_v6[0] & 0x000000000000ff00) >> 2;
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sprintf( str, "%x.", ipv4);
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strcat(host_ip, str);
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ipv4 = utmp->ut_addr_v6[0] & 0x00000000000000ff;
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sprintf( str, "%x", ipv4);
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strcat(host_ip, str);
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}else
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{
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for (x=0;x<4;x++)
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{
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ipv6_1 = (utmp->ut_addr_v6[x] & 0xffffffff00000000) >> 8;
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sprintf( str, "%x:", ipv6_1);
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strcat(host_ipv6, str);
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ipv6_2 = utmp->ut_addr_v6[x] & 0x00000000ffffffff;
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sprintf( str, "%x:", ipv6_1);
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strcat(host_ipv6, str);
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}
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host_ipv6[strlen(host_ipv6)-1] = '\0';
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}
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*time = (time_t) utmp->ut_tv.tv_sec; //got connexion time
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break;
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}
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}
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endutent();
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}
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//replace null characters by space
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int null2space( char str[] )
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{
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int flag =0;
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int x = 0;
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while ( flag == 0 )
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{
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if ( (int) str[x] == 0 )
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{
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if ( (int) str[x+1] != 0 )
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{
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str[x] = ' ';
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}else
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{
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flag = 1;
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}
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}
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x++;
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}
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return x-1 ;
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}
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// get the childs pids
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int getpids(int pid, int exploded[])
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{
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FILE *fh;
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char * pch;
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char path[1024];
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char str[4096];
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char separator[] = " ";
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int x = 0;
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sprintf( path, "/proc/%d/task/%d/children", pid,pid);
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//printf(" %s", proc_path);
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if ((fh = fopen( path, "r")) == NULL)
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{
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perror(path);
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return -1;
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}
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if ( fgets( str, 40, fh ) != NULL )
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{
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pch = strtok( str, separator );
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while( pch != NULL )
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{
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exploded[x++] = atoi( pch );
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pch = strtok( NULL , separator );
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}
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fclose(fh);
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return x;
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}else
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{
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fclose(fh);
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return -1;
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}
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}
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int getprocinfo( int ppid, char cmdline[], char cmd[], char user[], char host_ip[], char host_ipv6[], char date[] )
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{
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FILE *fh1;
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char child_path[128];
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char str[1024];
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int child_pid[10];
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int flag = 0;
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int r;
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int pid = ppid;
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int level = 0;
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int retval = 0;
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time_t timet=0;
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//get connexion time
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getutmp( pid, user, host_ip, host_ipv6, &timet );
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if ( timet == 0)
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{
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time( &timet );
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}
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sprintf( date, "%s", ctime(&timet) );
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date[strlen(date)-1] = 0;
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//get the pid of the last processus
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while ( flag == 0)
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{
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r = getpids( pid, child_pid );
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if( level == 0 && r == 2 )
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{
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flag = 1;
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retval = -1;
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}else if ( r != -1 )
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{
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level++;
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pid = child_pid[0];
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}else
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{
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flag = 1;
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}
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}
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// get the command parameters
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sprintf( child_path, "/proc/%d/cmdline", pid );
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if ( (fh1= fopen( child_path, "r" )) == NULL)
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{
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perror(child_path);
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return 2;
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}
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fgets( str, 1024, fh1);
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flag = 0;
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null2space( str );
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sprintf(cmdline, "%s", str);
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fclose(fh1);
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// get the command name
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sprintf( child_path, "/proc/%d/comm", pid );
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if ( (fh1= fopen(child_path, "r" )) == NULL)
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{
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perror(child_path);
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return 3;
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}
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fscanf( fh1, "%s", cmd );
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fclose(fh1);
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return retval;
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}
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int main()
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{
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FILE *fh;
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FILE *fh1;
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int n_ssh=10;
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int id;
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int pid;
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int x=0;
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int y=0;
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int r;
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int i;
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int j;
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int n;
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int start=1;
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int childrens[n_ssh];
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int pids[n_ssh];
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int flag[n_ssh];
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int rinfo;
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int status;
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// char path[1024];
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char commande[] = "/usr/local/bin/send_sms";
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char logfile[] = "/var/log/sshdetect.log";
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char cmd[24];
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char cmdline[1000];
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char user[24]="";
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char host_ip[42];
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char host_ipv6[42];
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char str[1024];
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char date[60];
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time_t now ;
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time( &now );
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sprintf( date, "%s", ctime(&now));
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date[strlen(date)-1] = 0;
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if ( (fh = fopen(logfile, "a")) == NULL)
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{
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perror(logfile);
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return 1;
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}
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fprintf(fh, "%s: Démarrage de sshdetect\n", date);
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fclose(fh);
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sprintf( str, "%s \"%s - %s: Démarrage de sshdetect\"", commande, HOSTNAME, date );
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id=fork();
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if(id == 0)
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{
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r = system( str );
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exit(r);
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}else if( id<0 )
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{
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printf("erreur de création du fork: %s", str);
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}
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while (1)
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{
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// get the sshd process ID (PID)
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if ( (fh = fopen("/run/sshd.pid", "r" )) == NULL)
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{
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perror("/run/sshd.pid");
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return 1;
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}
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if ( fscanf(fh, "%i", &pid) == 0)
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{
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printf("erreur fscanf: /run/sshd.pid" );
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return 10;
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}
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fclose(fh);
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//printf("%i", pid);
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//get the list of children
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if ( (n=getpids( pid, pids )) != -1)
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{
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for ( y=0; y<n; y++)
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{
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pid = pids[y];
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r = isinarray(pid, childrens, x);
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if( r == 0 )
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{
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user[0]='\0';
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rinfo = getprocinfo( pid, cmdline, cmd, user, host_ip, host_ipv6, date );
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if( rinfo == 0 )
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{
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x++;
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childrens[x] = pid;
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flag[x] = 1;
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// date of connexion
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if (user[0] == '\0')
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{
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sprintf( str, "%s \"%s: tunnel ouvert le %s depuis %s avec la commande: %s %s\"", commande, HOSTNAME, date, host_ip, cmd, cmdline );
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}else
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{
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sprintf( str, "%s \"%s: %s s'est connecté le %s depuis %s avec la commande: %s %s\"", commande, HOSTNAME, user, date, host_ip, cmd, cmdline );
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}
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if ( start != 1 )
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{
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id=fork();
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if(id>0)
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{
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if ( (fh1 = fopen(logfile, "a")) == NULL)
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{
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perror(logfile);
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return 7;
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}
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fprintf(fh1, "%s: Connexion de %s depuis %s commande: %s %s", date, user, host_ip, cmd, cmdline);
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fclose(fh1);
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}else if (id<0)
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{
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printf("erreur de création du fork: %s", str);
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}else
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{
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printf("%s\n", str);
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r = system( str );
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exit (r);
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}
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}else
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{
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if ( (fh1 = fopen(logfile, "a")) == NULL)
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{
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perror(logfile);
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return 7;
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}
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fprintf(fh1, "%s: %s Connecté depuis %s - %s %s\n", date, user, host_ip, cmd, cmdline);
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fclose(fh1);
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}
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}
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}else
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{
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flag[r] = 1;
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}
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}
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for(i=1;i<=x;i++)
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{
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if (flag[i] == 0 )
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{
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printf("Session %d terminée\n", childrens[i]);
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for( j=i; j<x; j++ )
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{
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childrens[j] = childrens[j+1];
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flag[j] = flag[j+1];
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}
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i--;
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x--;
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}else
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{
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flag[i] = 0;
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}
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}
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sleep(2);
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waitpid(-1, &status ,WNOHANG);
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}
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start = 0;
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}
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return 0;
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}
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