1 files changed, 252 insertions, 0 deletions

diff --git a/src/widget-skey.c b/src/widget-skey.c
new file mode 100644
index 0000000..9fa69ea
--- /dev/null
+++ b/src/widget-skey.c
@@ -0,0 +1,252 @@
+/*
+ *  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);
+   };
+
+   // 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("S/KEY 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 */