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/*
* OTP Utilities
* Copyright (C) 2022 David M. Syzdek <david@syzdek.net>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of David M. Syzdek nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID M SYZDEK BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* @file src/widget-otp.c
*/
#define _SRC_WIDGET_OTP_C 1
///////////////
// //
// Headers //
// //
///////////////
#pragma mark - Headers
#include <otputil_compat.h>
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <assert.h>
#include <stdarg.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <getopt.h>
#include <stdio.h>
#include "otputil.h"
//////////////////
// //
// Prototypes //
// //
//////////////////
#pragma mark - Prototypes
static int
otputil_widget_skey_verbose(
otputil_config_t * cnf,
const otputil_bv_t * otp_data,
const otputil_bv_t * otp_verify,
const char * status );
/////////////////
// //
// Functions //
// //
/////////////////
#pragma mark - Functions
//---------------//
// main function //
//---------------//
#pragma mark main function
int
otputil_widget_skey(
otputil_config_t * cnf )
{
int rc;
int hash;
int seq;
uint64_t meth;
char * pass;
char * endptr;
const char * str;
const char * status;
static char buff[OTPUTIL_MAX_ENCODE_SIZE];
otputil_bv_t skey_data;
otputil_bv_t skey_verify;
otputil_bv_t * a;
otputil_bv_t * b;
uint8_t skey_data_val[512];
uint8_t skey_verify_val[512];
assert(cnf != NULL);
// set OTP method
meth = OTPUTIL_METH_SKEY;
if ((rc = otputil_set_param(NULL, OTPUTIL_OPT_METHOD, &meth)) == -1)
{
fprintf(stderr, "%s: otputil_set_param(METHOD): %s\n", cnf->prog_name, otputil_err2string(rc));
return(1);
};
// set default hash
if (!(strncasecmp(cnf->argv[0], "skey-", 5)))
{
if ((hash = otputil_str2md(&cnf->argv[0][5])) == -1)
{
fprintf(stderr, "%s: unsupported hash algorithm\n", cnf->prog_name);
return(1);
};
otputil_set_param(NULL, OTPUTIL_OPT_SKEY_HASH, &hash);
};
// initial processing of cli arguments
if ((rc = otputil_arguments(cnf, cnf->argc, cnf->argv)) != 0)
return((rc == -1) ? 0 : 1);
if (cnf->argc > optind)
{
seq = (int)strtoul(cnf->argv[optind], &endptr, 0);
if ((endptr == cnf->argv[optind]) || (endptr[0] != '\0'))
{
fprintf(stderr, "%s: invalid sequence number\n", cnf->prog_name);
fprintf(stderr, "Try `%s --help' for more information.\n", cnf->prog_name);
return(1);
};
if ((rc = otputil_set_param(NULL, OTPUTIL_OPT_SKEY_SEQ, &seq)) != OTPUTIL_SUCCESS)
{
fprintf(stderr, "%s: otputil_set_param(SKEY_SEQ): %s\n", cnf->prog_name, otputil_err2string(rc));
return(1);
};
};
// verify password was provided
otputil_get_param(NULL, OTPUTIL_OPT_SKEY_PASS, &pass);
if (!(pass))
{
str = otputil_getpass("Enter user's password:", NULL, 0);
if ((rc = otputil_set_param(NULL, OTPUTIL_OPT_SKEY_PASS, str)) != OTPUTIL_SUCCESS)
{
fprintf(stderr, "%s: otputil_set_param(SKEY_PASS): %s\n", cnf->prog_name, otputil_err2string(rc));
return(1);
};
};
if ((pass))
free(pass);
// generate OTP pass phrase
if ((str = otputil_str(NULL, buff, sizeof(buff))) == NULL)
{
fprintf(stderr, "%s: internal error\n", cnf->prog_name);
return(1);
};
skey_data.bv_val = skey_data_val;
skey_data.bv_len = sizeof(skey_data_val);
otputil_get_param(NULL, OTPUTIL_OPT_OTP_HASH, &hash);
otputil_otp_decode(str, &skey_data, hash);
// verify existing code
if ((cnf->otp_pass))
{
skey_verify.bv_val = skey_verify_val;
skey_verify.bv_len = sizeof(skey_verify_val);
if (otputil_otp_decode(cnf->otp_pass, &skey_verify, hash) == NULL)
{
fprintf(stderr, "%s: not a valid OTP passphrase to verify\n", cnf->prog_name);
return(1);
};
a = &skey_data;
b = &skey_verify;
rc = ((otputil_bvcmp(&a, &b))) ? 2 : 0;
status = ((rc)) ? "invalid code" : "valid code";
if ((cnf->verbose))
otputil_widget_skey_verbose(cnf, &skey_data, &skey_verify, status);
else
printf("%s\n", status);
return(rc);
};
// print results
if ( ((cnf->quiet)) || (!(cnf->verbose)) )
{
printf("%s\n", str);
return(0);
};
otputil_widget_skey_verbose(cnf, &skey_data, NULL, NULL);
return(0);
}
int
otputil_widget_skey_usage(
otputil_config_t * cnf )
{
assert(cnf != NULL);
printf("ALGORITHMS:\n");
printf(" md4 MD4 Message-Digest Algorithm\n");
printf(" md5 MD5 message-digest algorithm\n");
printf(" sha1 SHA-1 (Secure Hash Algorithm 1)\n");
printf(" sha256 SHA-2 (Secure Hash Algorithm 2) with 256 bits\n");
printf(" sha512 SHA-2 (Secure Hash Algorithm 2) with 512 bits\n");
return(0);
}
int
otputil_widget_skey_verbose(
otputil_config_t * cnf,
const otputil_bv_t * skey_data,
const otputil_bv_t * skey_verify,
const char * status )
{
int skey_hash;
int skey_seq;
char * util_desc;
char * skey_pass;
otputil_get_param(NULL, OTPUTIL_OPT_SKEY_SEQ, &skey_seq);
otputil_get_param(NULL, OTPUTIL_OPT_SKEY_HASH, &skey_hash);
otputil_get_param(NULL, OTPUTIL_OPT_SKEY_PASS, &skey_pass);
otputil_get_param(NULL, OTPUTIL_OPT_DESC, &util_desc);
// print secret information
printf("OTP Secret:\n");
printf(" Description: %s\n", (((util_desc)) ? util_desc : "n/a") );
printf(" Method: S/KEY (RFC1760)\n");
printf(" Hash: %s\n", otputil_md2str(skey_hash));
if (cnf->verbose > 1)
printf(" User Passsword: %s\n", skey_pass);
else
printf(" User Passsword: ********\n");
printf(" Sequence: %i\n", skey_seq );
if ((cnf->otp_pass))
printf(" Entered Pass Phrase: %s\n", cnf->otp_pass );
if ((cnf->otp_pass))
printf(" Expected Code: %s\n", otputil_otp_encode(skey_verify, NULL, 0, OTPUTIL_ENC_HEX) );
printf(" OTP Code: %s\n", otputil_otp_encode(skey_data, NULL, 0, OTPUTIL_ENC_HEX) );
if ((cnf->otp_pass))
printf(" Expected Pass Phrase: %s\n", otputil_otp_encode(skey_verify, NULL, 0, OTPUTIL_ENC_SIXWORD) );
printf(" OTP Pass Phrase: %s\n", otputil_otp_encode(skey_data, NULL, 0, OTPUTIL_ENC_SIXWORD) );
if ((status))
printf(" Status: %s\n", status );
printf("\n");
return(0);
}
/* end of source file */
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