/*************************************************************************** * ncat_posix.c -- POSIX-specific functions. * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2009 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. To avoid * * misunderstandings, we consider an application to constitute a * * "derivative work" for the purpose of this license if it does any of the * * following: * * o Integrates source code from Nmap * * o Reads or includes Nmap copyrighted data files, such as * * nmap-os-db or nmap-service-probes. * * o Executes Nmap and parses the results (as opposed to typical shell or * * execution-menu apps, which simply display raw Nmap output and so are * * not derivative works.) * * o Integrates/includes/aggregates Nmap into a proprietary executable * * installer, such as those produced by InstallShield. * * o Links to a library or executes a program that does any of the above * * * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap. This list is not exclusive, but is meant to clarify our * * interpretation of derived works with some common examples. Our * * interpretation applies only to Nmap--we don't speak for other people's * * GPL works. * * * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help. As mentioned above, * * we also offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to dozens * * of software vendors, and generally include a perpetual license as well * * as providing for priority support and updates as well as helping to * * fund the continued development of Nmap technology. Please email * * sales@insecure.com for further information. * * * * As a special exception to the GPL terms, Insecure.Com LLC grants * * permission to link the code of this program with any version of the * * OpenSSL library which is distributed under a license identical to that * * listed in the included COPYING.OpenSSL file, and distribute linked * * combinations including the two. You must obey the GNU GPL in all * * respects for all of the code used other than OpenSSL. If you modify * * this file, you may extend this exception to your version of the file, * * but you are not obligated to do so. * * * * If you received these files with a written license agreement or * * contract stating terms other than the terms above, then that * * alternative license agreement takes precedence over these comments. * * * * Source is provided to this software because we believe users have a * * right to know exactly what a program is going to do before they run it. * * This also allows you to audit the software for security holes (none * * have been found so far). * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to send your changes * * to nmap-dev@insecure.org for possible incorporation into the main * * distribution. By sending these changes to Fyodor or one of the * * Insecure.Org development mailing lists, it is assumed that you are * * offering the Nmap Project (Insecure.Com LLC) the unlimited, * * non-exclusive right to reuse, modify, and relicense the code. Nmap * * will always be available Open Source, but this is important because the * * inability to relicense code has caused devastating problems for other * * Free Software projects (such as KDE and NASM). We also occasionally * * relicense the code to third parties as discussed above. If you wish to * * specify special license conditions of your contributions, just say so * * when you send them. * * * * 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 v2.0 for more details at * * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * * included with Nmap. * * * ***************************************************************************/ /* $Id$ */ #include #include "ncat.h" char **cmdline_split(const char *cmdexec); /* fork and exec a child process with netexec. Close the given file descriptor in the parent process. Return the child's PID or -1 on error. */ int netrun(int fd, char *cmdexec) { int pid; errno = 0; pid = fork(); if (pid == 0) { /* In the child process. */ netexec(fd, cmdexec); } if (pid == -1 && o.verbose) logdebug("Error in fork: %s\n", strerror(errno)); Close(fd); return pid; } /* exec the given command line. Before the exec, redirect stdin, stdout, and stderr to the given file descriptor. Never returns. */ void netexec(int fd, char *cmdexec) { if (o.debug) { if (o.shellexec) logdebug("Executing with shell: %s\n", cmdexec); else logdebug("Executing: %s\n", cmdexec); } /* rearrange stdin/stdout/stderr */ /* Dup2(fd, STDIN_FILENO); Dup2(fd, STDOUT_FILENO); Dup2(fd, STDERR_FILENO); */ if (o.shellexec) { execl("/bin/sh", "sh", "-c", cmdexec, NULL); } else { char **cmdargs; cmdargs = cmdline_split(cmdexec); execv(cmdargs[0], cmdargs); } /* exec failed.*/ die("exec"); } /* * Split a command line into an array suitable for handing to execv. * * A note on syntax: words are split on whitespace and '\' escapes characters. * '\\' will show up as '\' and '\ ' will leave a space, combining two * words. Examples: * "ncat\ experiment -l -k" will be parsed as the following tokens: * "ncat experiment", "-l", "-k". * "ncat\\ -l -k" will be parsed as "ncat\", "-l", "-k" * See the test program, test/test-cmdline-split to see additional cases. */ char **cmdline_split(const char *cmdexec) { const char *ptr; char *cur_arg, **cmd_args; int max_tokens = 0, arg_idx = 0, ptr_idx = 0; /* Figure out the maximum number of tokens needed */ ptr = cmdexec; while (*ptr) { // Find the start of the token while (('\0' != *ptr) && isspace((int) (unsigned char) *ptr)) ptr++; if ('\0' == *ptr) break; max_tokens++; // Find the start of the whitespace again while (('\0' != *ptr) && !isspace((int) (unsigned char) *ptr)) ptr++; } /* The line is not empty so we've got something to deal with */ cmd_args = (char**)safe_malloc(sizeof(char*) * (max_tokens + 1)); cur_arg = (char*)Calloc(sizeof(char), strlen(cmdexec)); /* Get and copy the tokens */ ptr = cmdexec; while (*ptr) { while (('\0' != *ptr) && isspace((int) (unsigned char) *ptr)) ptr++; if ('\0' == *ptr) break; while (('\0' != *ptr) && !isspace((int) (unsigned char) *ptr)) { if ('\\' == *ptr) { ptr++; if ('\0' == *ptr) break; cur_arg[ptr_idx] = *ptr; ptr_idx++; ptr++; if ('\\' != *(ptr - 1)) { while (('\0' != *ptr) && isspace((int) (unsigned char) *ptr)) ptr++; } } else { cur_arg[ptr_idx] = *ptr; ptr_idx++; ptr++; } } cur_arg[ptr_idx] = '\0'; cmd_args[arg_idx] = strdup(cur_arg); cur_arg[0] = '\0'; ptr_idx = 0; arg_idx++; } cmd_args[arg_idx] = NULL; /* Clean up */ free(cur_arg); return cmd_args; } void set_lf_mode(void) { /* Nothing needed. */ } #ifdef HAVE_OPENSSL #define NCAT_CA_CERTS_PATH (NCAT_DATADIR "/" NCAT_CA_CERTS_FILE) int ssl_load_default_ca_certs(SSL_CTX *ctx) { int rc; if (o.debug) logdebug("Using system default trusted CA certificates and those in %s.\n", NCAT_CA_CERTS_PATH); /* Load distribution-provided defaults, if any. */ assert(SSL_CTX_set_default_verify_paths(ctx) > 0); /* Also load the trusted certificates we ship. */ rc = SSL_CTX_load_verify_locations(ctx, NCAT_CA_CERTS_PATH, NULL); if (rc != 1) { if (o.debug) logdebug("Unable to load trusted CA certificates from %s: %s\n", NCAT_CA_CERTS_PATH, ERR_error_string(ERR_get_error(), NULL)); return -1; } return 0; } #endif