/*************************************************************************** * ncrack_pop3.cc -- ncrack module for the POP3 protocol * * Coded by Balázs Bucsay * * http://rycon.hu/ * * * * 2010. 02. 05. * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2011 Insecure.Com LLC. Nmap is * * also a registered trademark of Insecure.Com LLC. This program is free * * software; you may redistribute and/or modify it under the terms of the * * GNU General Public License as published by the Free Software * * Foundation; Version 2 with the clarifications and exceptions described * * below. This guarantees your right to use, modify, and redistribute * * this software under certain conditions. If you wish to embed Nmap * * technology into proprietary software, we sell alternative licenses * * (contact sales@insecure.com). Dozens of software vendors already * * license Nmap technology such as host discovery, port scanning, OS * * detection, and version detection. * * * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term. 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See the GNU * * General Public License v2.0 for more details at * * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * * included with Nmap. * * * ***************************************************************************/ #include "ncrack.h" #include "nsock.h" #include "NcrackOps.h" #include "Service.h" #include "modules.h" #include #define POP3_TIMEOUT 20000 extern NcrackOps o; extern void ncrack_read_handler(nsock_pool nsp, nsock_event nse, void *mydata); extern void ncrack_write_handler(nsock_pool nsp, nsock_event nse, void *mydata); extern void ncrack_module_end(nsock_pool nsp, void *mydata); static int pop3_response_parser(nsock_pool nsp, Connection *con); enum states { POP3_INIT, POP3_USER, POP3_FINI }; static int pop3_response_parser(nsock_pool nsp, Connection *con) { char *p; int i; if (con->inbuf == NULL || con->inbuf->get_len() < 3) { nsock_read(nsp, con->niod, ncrack_read_handler, POP3_TIMEOUT, con); return -1; } if (memsearch((const char *)con->inbuf->get_dataptr(), "-ERR", con->inbuf->get_len())) { return 2; } if (!(memsearch((const char *)con->inbuf->get_dataptr(), "+OK", con->inbuf->get_len()))) { return 1; } return 0; } void ncrack_pop3(nsock_pool nsp, Connection *con) { int ret; nsock_iod nsi = con->niod; Service *serv = con->service; switch (con->state) { case POP3_INIT: if (!con->login_attempts) { if ((ret = pop3_response_parser(nsp, con)) < 0) { break; } if (ret == 1) { if (o.debugging > 6) { error("%s Not pop3 or service was shutdown\n", serv->HostInfo()); return ncrack_module_end(nsp, con); } } } con->state = POP3_USER; delete con->inbuf; con->inbuf = NULL; if (con->outbuf) delete con->outbuf; con->outbuf = new Buf(); con->outbuf->snprintf(7 + strlen(con->user), "USER %s\r\n", con->user); nsock_write(nsp, nsi, ncrack_write_handler, POP3_TIMEOUT, con, (const char *)con->outbuf->get_dataptr(), con->outbuf->get_len()); break; case POP3_USER: if ((ret = pop3_response_parser(nsp, con)) < 0) { break; } if (ret == 2) { if (o.debugging > 6) { error("%s Unknown user: %s\n", serv->HostInfo(), con->user); return ncrack_module_end(nsp, con); } } if (ret == 1) { if (o.debugging > 6) { error("%s Unknown pop3 error for USER\n", serv->HostInfo()); return ncrack_module_end(nsp, con); } } con->state = POP3_FINI; delete con->inbuf; con->inbuf = NULL; if (con->outbuf) delete con->outbuf; con->outbuf = new Buf(); con->outbuf->snprintf(7 + strlen(con->pass), "PASS %s\r\n", con->pass); nsock_write(nsp, nsi, ncrack_write_handler, POP3_TIMEOUT, con, (const char *)con->outbuf->get_dataptr(), con->outbuf->get_len()); break; case POP3_FINI: if ((ret = pop3_response_parser(nsp, con)) < 0) { break; } if (ret == 0) { con->auth_success = true; } con->state = POP3_INIT; delete con->inbuf; con->inbuf = NULL; return ncrack_module_end(nsp, con); } }