Исходное сообщение
"Блокирование подбора паролей с помошью пакетного фильтра PF" Отправлено Adil_18, 08-Май-06 00:23
#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <stdarg.h> #include <syslog.h> int main(int ac, char **av) {     char buf[1024];     char *str;     int n1;     int n2;     int n3;     int n4;     openlog("sshlockout", LOG_PID|LOG_CONS, LOG_AUTH);     syslog(LOG_ERR, "sshlockout starting up");     freopen("/dev/null", "w", stdout);     freopen("/dev/null", "w", stderr);     while (fgets(buf, sizeof(buf), stdin) != NULL) {         if (strstr(buf, "sshd") == NULL)             continue;         if (strstr(buf, "Failed password") == NULL)             continue;         if ((str = strstr(buf, "Failed password for root from")) != NULL ||             (str = strstr(buf, "Failed password for admin from")) != NULL         ) {             while (*str && (*str < '0' || *str > '9'))                 ++str;             if (sscanf(str, "%d.%d.%d.%d", &n1, &n2, &n3, &n4) == 4) {                 syslog(LOG_ERR, "Detected ssh password login attempt for root, locking out %d.%d.%d.%d\n", n1, n2, n3, n4);                 snprintf(buf, sizeof(buf), "ipfw add 2100 deny tcp from %d.%d.%d.%d to me 22", n1, n2, n3, n4);                 system(buf);             }             continue;         }         if ((str = strstr(buf, "Failed password for invalid user")) != NULL) {             str += 32;             while (*str == ' ')                 ++str;             while (*str && *str != ' ')                 ++str;             if (strncmp(str, " from", 5) == 0 &&                 sscanf(str + 5, "%d.%d.%d.%d", &n1, &n2, &n3, &n4) == 4) {                 syslog(LOG_ERR, "Detected ssh password login attempt for an invalid user, locking out %d.%d.%d.%d\n", n1, n 2, n3, n4);                 snprintf(buf, sizeof(buf), "ipfw add 2100 deny tcp from %d.%d.%d.%d to me 22", n1, n2, n3, n4);                 system(buf);             }         }     }     syslog(LOG_ERR, "sshlockout exiting");     return(0); }

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Сообщение*:	> #include <stdio.h> > #include <stdlib.h> > #include <unistd.h> > #include <string.h> > #include <stdarg.h> > #include <syslog.h> > int > main(int ac, char **av) > { > char buf[1024]; > char *str; > int n1; > int n2; > int n3; > int n4; > openlog("sshlockout", LOG_PID|LOG_CONS, LOG_AUTH); > syslog(LOG_ERR, "sshlockout starting up"); > freopen("/dev/null", "w", stdout); > freopen("/dev/null", "w", stderr); > while (fgets(buf, sizeof(buf), stdin) != NULL) { > if (strstr(buf, "sshd") == > NULL) > > continue; > if (strstr(buf, "Failed password") > == NULL) > > continue; > if ((str = strstr(buf, > "Failed password for root from")) != NULL || > > (str = strstr(buf, "Failed password for admin from")) != NULL > ) { > > while (*str && (*str < '0' || *str > '9')) > > ++str; > > if (sscanf(str, "%d.%d.%d.%d", &n1, &n2, &n3, &n4) == 4) { > > syslog(LOG_ERR, "Detected ssh password login attempt for > root, locking out %d.%d.%d.%d\n", n1, n2, n3, n4); > > snprintf(buf, sizeof(buf), "ipfw add 2100 deny tcp > from %d.%d.%d.%d to me 22", n1, n2, n3, n4); > > system(buf); > > } > > continue; > } > if ((str = strstr(buf, > "Failed password for invalid user")) != NULL) { > > str += 32; > > while (*str == ' ') > > ++str; > > while (*str && *str != ' ') > > ++str; > > if (strncmp(str, " from", 5) == 0 && > > sscanf(str + 5, "%d.%d.%d.%d", &n1, &n2, &n3, > &n4) == 4) { > > syslog(LOG_ERR, "Detected ssh password login attempt for > an invalid user, locking out %d.%d.%d.%d\n", n1, n > 2, n3, n4); > > snprintf(buf, sizeof(buf), "ipfw add 2100 deny tcp > from %d.%d.%d.%d to me 22", n1, n2, n3, n4); > > system(buf); > > } > } > } > syslog(LOG_ERR, "sshlockout exiting"); > return(0); > }
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