722 lines
20 KiB
C
722 lines
20 KiB
C
/* $Id$
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*****************************************************************************
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*
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* File: fwknop.c
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*
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* Author: Damien S. Stuart
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*
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* Purpose: An implementation of an fwknop client.
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*
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* Copyright (C) 2009 Damien Stuart (dstuart@dstuart.org)
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*
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* License (GNU Public License):
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*****************************************************************************
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*/
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#include "fwknop.h"
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#include "config_init.h"
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#include "spa_comm.h"
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#include "utils.h"
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#include "getpasswd.h"
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/* prototypes
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*/
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char* get_user_pw(fko_cli_options_t *options, int crypt_op);
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static void display_ctx(fko_ctx_t ctx);
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void errmsg(char *msg, int err);
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static void show_last_command(void);
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static void save_args(int argc, char **argv);
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static int set_message_type(fko_ctx_t ctx, fko_cli_options_t *options);
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static int set_nat_access(fko_ctx_t ctx, fko_cli_options_t *options);
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static int get_rand_port(fko_ctx_t ctx);
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static void dump_transmit_options(fko_cli_options_t *options);
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int resolve_ip_http(fko_cli_options_t *options);
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int
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main(int argc, char **argv)
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{
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fko_ctx_t ctx, ctx2;
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int res;
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char *spa_data, *version;
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char access_buf[MAX_LINE_LEN];
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fko_cli_options_t options;
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/* Handle command line
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*/
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config_init(&options, argc, argv);
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/* Handle options that don't require a libfko context
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*/
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if(options.show_last_command)
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show_last_command();
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else if (!options.no_save_args)
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save_args(argc, argv);
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/* Intialize the context
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*/
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res = fko_new(&ctx);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_new", res);
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return(EXIT_FAILURE);
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}
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/* Display version info and exit.
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*/
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if (options.version) {
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fko_get_version(ctx, &version);
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fprintf(stdout, "[+] fwknop client %s, FKO protocol version %s\n",
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MY_VERSION, version);
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return(EXIT_SUCCESS);
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}
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/* Set client timeout
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*/
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if(options.fw_timeout >= 0)
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{
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res = fko_set_spa_client_timeout(ctx, options.fw_timeout);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_spa_client_timeout", res);
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return(EXIT_FAILURE);
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}
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}
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/* Set the SPA packet message type based on command line options
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*/
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res = set_message_type(ctx, &options);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_spa_message_type", res);
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return(EXIT_FAILURE);
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}
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if(options.server_command[0] != 0x0)
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{
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/* Set the access message to a command that the server will
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* execute
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*/
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snprintf(access_buf, MAX_LINE_LEN, "%s%s%s",
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options.allow_ip_str, ",", options.server_command);
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}
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else
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{
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/* Resolve the client's public facing IP address if requestesd.
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* if this fails, consider it fatal.
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*/
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if (options.resolve_ip_http)
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if(resolve_ip_http(&options) < 0)
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return(EXIT_FAILURE);
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/* Set a message string by combining the allow IP and the
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* port/protocol. The fwknopd server allows no port/protocol
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* to be specified as well, so in this case append the string
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* "none/0" to the allow IP.
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*/
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if(options.access_str[0] != 0x0)
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{
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snprintf(access_buf, MAX_LINE_LEN, "%s%s%s",
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options.allow_ip_str, ",", options.access_str);
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}
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else
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{
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snprintf(access_buf, MAX_LINE_LEN, "%s%s%s",
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options.allow_ip_str, ",", "none/0");
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}
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}
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res = fko_set_spa_message(ctx, access_buf);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_spa_message", res);
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return(EXIT_FAILURE);
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}
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/* Set NAT access string
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*/
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if (options.nat_local || options.nat_access_str[0] != 0x0)
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{
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res = set_nat_access(ctx, &options);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_nat_access_str", res);
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return(EXIT_FAILURE);
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}
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}
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/* Set username
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*/
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if(options.spoof_user[0] != 0x0)
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{
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res = fko_set_username(ctx, options.spoof_user);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_username", res);
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return(EXIT_FAILURE);
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}
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}
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/* Set up for using GPG if specified.
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*/
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if(options.use_gpg)
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{
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/* If use-gpg-agent was not specified, then remove the GPG_AGENT_INFO
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* ENV variable if it exists.
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*/
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#ifndef WIN32
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if(!options.use_gpg_agent)
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unsetenv("GPG_AGENT_INFO");
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#endif
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res = fko_set_spa_encryption_type(ctx, FKO_ENCRYPTION_GPG);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_spa_encryption_type", res);
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return(EXIT_FAILURE);
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}
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/* If a GPG home dir was specified, set it here. Note: Setting
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* this has to occur before calling any of the other GPG-related
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* functions.
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*/
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if(options.gpg_home_dir != NULL && strlen(options.gpg_home_dir) > 0)
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{
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res = fko_set_gpg_home_dir(ctx, options.gpg_home_dir);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_gpg_home_dir", res);
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return(EXIT_FAILURE);
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}
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}
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res = fko_set_gpg_recipient(ctx, options.gpg_recipient_key);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_gpg_recipient", res);
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if(IS_GPG_ERROR(res))
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fprintf(stderr, "GPG ERR: %s\n", fko_gpg_errorstr(ctx));
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return(EXIT_FAILURE);
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}
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if(options.gpg_signer_key != NULL && strlen(options.gpg_signer_key))
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{
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res = fko_set_gpg_signer(ctx, options.gpg_signer_key);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_gpg_signer", res);
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if(IS_GPG_ERROR(res))
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fprintf(stderr, "GPG ERR: %s\n", fko_gpg_errorstr(ctx));
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return(EXIT_FAILURE);
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}
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}
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}
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/* Set Digest type.
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*/
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if(options.digest_type)
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{
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fko_set_spa_digest_type(ctx, options.digest_type);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_spa_digest_type", res);
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return(EXIT_FAILURE);
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}
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}
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/* Finalize the context data (encrypt and encode the SPA data)
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*/
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res = fko_spa_data_final(ctx, get_user_pw(&options, CRYPT_OP_ENCRYPT));
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_spa_data_final", res);
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if(IS_GPG_ERROR(res))
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fprintf(stderr, "GPG ERR: %s\n", fko_gpg_errorstr(ctx));
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return(EXIT_FAILURE);
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}
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/* Display the context data.
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*/
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if (options.verbose || options.test)
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display_ctx(ctx);
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/* Save packet data payload if requested.
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*/
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if (options.save_packet_file[0] != 0x0)
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write_spa_packet_data(ctx, &options);
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if (options.rand_port)
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options.spa_dst_port = get_rand_port(ctx);
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if (options.verbose)
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dump_transmit_options(&options);
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/* If not in test mode, send the SPA data across the wire with a
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* protocol/port specified on the command line (default is UDP/62201).
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* Otherwise, run through a decode cycle (--DSS XXX: This test/decode
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* portion should be moved elsewhere).
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*/
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if (!options.test)
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{
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res = send_spa_packet(ctx, &options);
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if(res < 0)
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{
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fprintf(stderr, "[*] send_spa_packet: packet not sent.\n");
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return(EXIT_FAILURE);
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}
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else
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{
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if(options.verbose)
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fprintf(stderr, "[+] send_spa_packet: bytes sent: %i\n", res);
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}
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}
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else
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{
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/************** Decoding now *****************/
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/* Now we create a new context based on data from the first one.
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*/
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res = fko_get_spa_data(ctx, &spa_data);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_get_spa_data", res);
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return(EXIT_FAILURE);
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}
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/* If gpg-home-dir is specified, we have to defer decrypting if we
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* use the fko_new_with_data() function because we need to set the
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* gpg home dir after the context is created, but before we attempt
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* to decrypt the data. Therefore we either pass NULL for the
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* decryption key to fko_new_with_data() or use fko_new() to create
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* an empty context, populate it with the encrypted data, set our
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* options, then decode it.
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*/
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res = fko_new_with_data(&ctx2, spa_data, NULL);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_new_with_data", res);
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return(EXIT_FAILURE);
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}
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/* See if we are using gpg and if we need to set the GPG home dir.
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*/
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if(options.use_gpg)
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{
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if(options.gpg_home_dir != NULL && strlen(options.gpg_home_dir) > 0)
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{
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res = fko_set_gpg_home_dir(ctx2, options.gpg_home_dir);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_set_gpg_home_dir", res);
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return(EXIT_FAILURE);
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}
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}
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}
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res = fko_decrypt_spa_data(
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ctx2, get_user_pw(&options, CRYPT_OP_DECRYPT)
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);
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if(res != FKO_SUCCESS)
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{
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errmsg("fko_decrypt_spa_data", res);
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if(IS_GPG_ERROR(res)) {
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/* we most likely could not decrypt the gpg-encrypted data
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* because we don't have access to the private key associated
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* with the public key we used for encryption. Since this is
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* expected, return 0 instead of an error condition (so calling
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* programs like the fwknop test suite don't interpret this as
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* an unrecoverable error), but print the error string for
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debugging purposes. */
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fprintf(stderr, "GPG ERR: %s\n%s\n", fko_gpg_errorstr(ctx2),
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"[*] No access to recipient private key?\n");
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return(EXIT_SUCCESS);
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}
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return(EXIT_FAILURE);
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}
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printf("\nDump of the Decoded Data\n");
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display_ctx(ctx2);
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fko_destroy(ctx2);
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}
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fko_destroy(ctx);
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return(EXIT_SUCCESS);
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}
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static void
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print_proto(int proto)
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{
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switch (proto) {
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case FKO_PROTO_UDP:
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printf("udp");
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break;
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case FKO_PROTO_TCP_RAW:
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printf("tcpraw");
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break;
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case FKO_PROTO_TCP:
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printf("tcp");
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break;
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case FKO_PROTO_ICMP:
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printf("icmp");
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break;
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case FKO_PROTO_HTTP:
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printf("http");
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break;
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}
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return;
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}
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static int
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get_rand_port(fko_ctx_t ctx)
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{
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char *rand_val = NULL;
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int port = 0;
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int res = 0;
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res = fko_get_rand_value(ctx, &rand_val);
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if(res != FKO_SUCCESS)
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{
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errmsg("get_rand_port(), fko_get_rand_value", res);
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exit(EXIT_FAILURE);
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}
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/* Convert to a random value between 1024 and 65535
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*/
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port = (MIN_HIGH_PORT + (abs(atoi(rand_val)) % (MAX_PORT - MIN_HIGH_PORT)));
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/* Force libfko to calculate a new random value since we don't want to
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* given anyone a hint (via the port value) about the contents of the
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* encrypted SPA data.
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*/
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res = fko_set_rand_value(ctx, NULL);
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if(res != FKO_SUCCESS)
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{
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errmsg("get_rand_port(), fko_get_rand_value", res);
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exit(EXIT_FAILURE);
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}
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return port;
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}
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static void
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dump_transmit_options(fko_cli_options_t *options)
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{
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printf("[+] Generating SPA packet:\n protocol: ");
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print_proto(options->spa_proto),
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printf("\n port: %d\n", options->spa_dst_port);
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return;
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}
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/* See if the string is of the format "<ipv4 addr>:<port>",
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* e.g. "123.1.2.3,12345" - this needs work.
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*/
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static int
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ipv4_str_has_port(char *str)
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{
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int rv = 0, i;
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int st_len = strlen(str);
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for (i=0; i < st_len; i++) {
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if (str[i] == ',' || str[i] == ':') {
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str[i] = ','; /* force "<ip>,<port>" format */
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rv = 1;
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continue;
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}
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if (rv && ! isdigit(str[i])) {
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rv = 0;
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break;
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}
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}
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return rv;
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}
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/* Set NAT access string
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*/
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static int
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set_nat_access(fko_ctx_t ctx, fko_cli_options_t *options)
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{
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char nat_access_buf[MAX_LINE_LEN] = "";
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int nat_port = 0;
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if (options->nat_rand_port)
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nat_port = get_rand_port(ctx);
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else if (options->nat_port)
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nat_port = options->nat_port;
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else
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nat_port = DEFAULT_NAT_PORT;
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if (options->nat_local && options->nat_access_str[0] == 0x0)
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{
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snprintf(nat_access_buf, MAX_LINE_LEN, "%s,%d",
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options->spa_server_str, nat_port);
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}
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if (nat_access_buf[0] == 0x0 && options->nat_access_str[0] != 0x0)
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{
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if (ipv4_str_has_port(options->nat_access_str))
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{
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snprintf(nat_access_buf, MAX_LINE_LEN, "%s",
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options->nat_access_str);
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}
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else
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{
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snprintf(nat_access_buf, MAX_LINE_LEN, "%s,%d",
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options->nat_access_str, nat_port);
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}
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}
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return fko_set_spa_nat_access(ctx, nat_access_buf);
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}
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static int
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get_save_file(char *args_save_file)
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{
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char *homedir = NULL;
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int rv = 0;
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homedir = getenv("HOME");
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if (homedir != NULL) {
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snprintf(args_save_file, MAX_PATH_LEN, "%s%s%s",
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homedir, "/", ".fwknop.run");
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rv = 1;
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}
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return rv;
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}
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/* Show the last command that was executed
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*/
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static void
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show_last_command(void)
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{
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char args_save_file[MAX_PATH_LEN];
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char args_str[MAX_LINE_LEN] = "";
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FILE *args_file_ptr = NULL;
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#ifdef WIN32
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/* Not sure what the right thing is here on Win32, just exit
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* for now.
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*/
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printf("[*] --show-last not implemented on Win32 yet.");
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exit(EXIT_FAILURE);
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#endif
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if (get_save_file(args_save_file)) {
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if ((args_file_ptr = fopen(args_save_file, "r")) == NULL) {
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printf("[*] Could not open args file: %s\n",
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args_save_file);
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exit(EXIT_FAILURE);
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}
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if ((fgets(args_str, MAX_LINE_LEN, args_file_ptr)) != NULL) {
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printf("[+] Last fwknop client command line: %s", args_str);
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} else {
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printf("[-] Could not read line from file: %s\n", args_save_file);
|
|
}
|
|
fclose(args_file_ptr);
|
|
}
|
|
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
/* Save our command line arguments
|
|
*/
|
|
static void
|
|
save_args(int argc, char **argv)
|
|
{
|
|
char args_save_file[MAX_PATH_LEN];
|
|
char args_str[MAX_LINE_LEN] = "";
|
|
FILE *args_file_ptr = NULL;
|
|
int i = 0, args_str_len;
|
|
|
|
#ifdef WIN32
|
|
/* Not sure what the right thing is here on Win32, just return
|
|
* for now.
|
|
*/
|
|
return;
|
|
#endif
|
|
|
|
|
|
if (get_save_file(args_save_file)) {
|
|
if ((args_file_ptr = fopen(args_save_file, "w")) == NULL) {
|
|
printf("[*] Could not open args file: %s\n",
|
|
args_save_file);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
for (i=0; i < argc; i++) {
|
|
args_str_len += strlen(argv[i]);
|
|
if (args_str_len >= MAX_PATH_LEN) {
|
|
printf("[*] argument string too long, exiting.\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
strlcat(args_str, argv[i], MAX_PATH_LEN);
|
|
strlcat(args_str, " ", MAX_PATH_LEN);
|
|
}
|
|
fprintf(args_file_ptr, "%s\n", args_str);
|
|
fclose(args_file_ptr);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* Set the SPA packet message type
|
|
*/
|
|
static int
|
|
set_message_type(fko_ctx_t ctx, fko_cli_options_t *options)
|
|
{
|
|
short message_type;
|
|
|
|
if(options->server_command[0] != 0x0)
|
|
{
|
|
message_type = FKO_COMMAND_MSG;
|
|
}
|
|
else if(options->nat_access_str[0] != 0x0)
|
|
{
|
|
if (options->nat_local)
|
|
{
|
|
if (options->fw_timeout >= 0)
|
|
{
|
|
message_type = FKO_CLIENT_TIMEOUT_LOCAL_NAT_ACCESS_MSG;
|
|
}
|
|
else
|
|
{
|
|
message_type = FKO_LOCAL_NAT_ACCESS_MSG;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (options->fw_timeout >= 0)
|
|
{
|
|
message_type = FKO_CLIENT_TIMEOUT_NAT_ACCESS_MSG;
|
|
}
|
|
else
|
|
{
|
|
message_type = FKO_NAT_ACCESS_MSG;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (options->fw_timeout >= 0)
|
|
{
|
|
message_type = FKO_CLIENT_TIMEOUT_ACCESS_MSG;
|
|
}
|
|
else
|
|
{
|
|
message_type = FKO_ACCESS_MSG;
|
|
}
|
|
}
|
|
return fko_set_spa_message_type(ctx, message_type);
|
|
}
|
|
|
|
/* Prompt for and receive a user password.
|
|
*/
|
|
char*
|
|
get_user_pw(fko_cli_options_t *options, int crypt_op)
|
|
{
|
|
if (options->get_key_file[0] != 0x0) {
|
|
/* grab the key/password from the --get-key file
|
|
*/
|
|
return(getpasswd_file(options->get_key_file,
|
|
options->spa_server_str));
|
|
}
|
|
else if (options->use_gpg) {
|
|
return(options->use_gpg_agent ? ""
|
|
: getpasswd("Enter passphrase for secret key: "));
|
|
}
|
|
else
|
|
{
|
|
if(crypt_op == CRYPT_OP_ENCRYPT)
|
|
return(getpasswd("Enter encryption password: "));
|
|
else if(crypt_op == CRYPT_OP_DECRYPT)
|
|
return(getpasswd("Enter decryption password: "));
|
|
else
|
|
return(getpasswd("Enter password: "));
|
|
}
|
|
}
|
|
|
|
/* Display an FKO error message.
|
|
*/
|
|
void
|
|
errmsg(char *msg, int err) {
|
|
fprintf(stderr, "[*] %s: %s: Error %i - %s\n",
|
|
MY_NAME, msg, err, fko_errstr(err));
|
|
}
|
|
|
|
/* Show the fields of the FKO context.
|
|
*/
|
|
static void
|
|
display_ctx(fko_ctx_t ctx)
|
|
{
|
|
char *rand_val = NULL;
|
|
char *username = NULL;
|
|
char *version = NULL;
|
|
char *spa_message = NULL;
|
|
char *nat_access = NULL;
|
|
char *server_auth = NULL;
|
|
char *enc_data = NULL;
|
|
char *spa_digest = NULL;
|
|
char *spa_data = NULL;
|
|
|
|
time_t timestamp = 0;
|
|
short msg_type = -1;
|
|
short digest_type = -1;
|
|
int client_timeout = -1;
|
|
|
|
/* Should be checking return values, but this is temp code. --DSS
|
|
*/
|
|
fko_get_rand_value(ctx, &rand_val);
|
|
fko_get_username(ctx, &username);
|
|
fko_get_timestamp(ctx, ×tamp);
|
|
fko_get_version(ctx, &version);
|
|
fko_get_spa_message_type(ctx, &msg_type);
|
|
fko_get_spa_message(ctx, &spa_message);
|
|
fko_get_spa_nat_access(ctx, &nat_access);
|
|
fko_get_spa_server_auth(ctx, &server_auth);
|
|
fko_get_spa_client_timeout(ctx, &client_timeout);
|
|
fko_get_spa_digest_type(ctx, &digest_type);
|
|
fko_get_encoded_data(ctx, &enc_data);
|
|
fko_get_spa_digest(ctx, &spa_digest);
|
|
fko_get_spa_data(ctx, &spa_data);
|
|
|
|
printf("\nFKO Field Values:\n=================\n\n");
|
|
printf(" Random Value: %s\n", rand_val == NULL ? "<NULL>" : rand_val);
|
|
printf(" Username: %s\n", username == NULL ? "<NULL>" : username);
|
|
printf(" Timestamp: %u\n", (unsigned int) timestamp);
|
|
printf(" FKO Version: %s\n", version == NULL ? "<NULL>" : version);
|
|
printf(" Message Type: %i\n", msg_type);
|
|
printf(" Message String: %s\n", spa_message == NULL ? "<NULL>" : spa_message);
|
|
printf(" Nat Access: %s\n", nat_access == NULL ? "<NULL>" : nat_access);
|
|
printf(" Server Auth: %s\n", server_auth == NULL ? "<NULL>" : server_auth);
|
|
printf(" Client Timeout: %u\n", client_timeout);
|
|
printf(" Digest Type: %u\n", digest_type);
|
|
printf("\n Encoded Data: %s\n", enc_data == NULL ? "<NULL>" : enc_data);
|
|
printf("\nSPA Data Digest: %s\n", spa_digest == NULL ? "<NULL>" : spa_digest);
|
|
printf("\nFinal Packed/Encrypted/Encoded Data:\n\n%s\n\n", spa_data);
|
|
}
|
|
|
|
/***EOF***/
|