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/* $OpenBSD: keynote-sign.c,v 1.20 2021/10/24 21:24:20 deraadt Exp $ */
/*
* The author of this code is Angelos D. Keromytis (angelos@dsl.cis.upenn.edu)
*
* This code was written by Angelos D. Keromytis in Philadelphia, PA, USA,
* in April-May 1998
*
* Copyright (C) 1998, 1999 by Angelos D. Keromytis.
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, THE AUTHORS MAKES NO
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include "header.h"
#include "keynote.h"
void signusage(void);
void
signusage(void)
{
fprintf(stderr, "Arguments:\n");
fprintf(stderr, "\t[-v] <AlgorithmName> <AssertionFile> "
"<PrivateKeyFile> [<print-offset>] [<print-length>]\n");
}
void
keynote_sign(int argc, char *argv[])
{
int begin = SIG_PRINT_OFFSET, prlen = SIG_PRINT_LENGTH;
char *buf, *buf2, *sig, *algname;
int fd, flg = 0, buflen;
struct stat sb;
if ((argc != 4) &&
(argc != 5) &&
(argc != 6) &&
(argc != 7))
{
signusage();
exit(1);
}
if (!strcmp("-v", argv[1]))
flg = 1;
if (argc > 4 + flg)
{
begin = atoi(argv[4 + flg]);
if (begin <= -1)
{
fprintf(stderr, "Erroneous value for print-offset parameter.\n");
exit(1);
}
}
if (argc > 5 + flg)
{
prlen = atoi(argv[5 + flg]);
if (prlen <= 0)
{
fprintf(stderr, "Erroneous value for print-length parameter.\n");
exit(1);
}
}
/* Fix algorithm name */
if (argv[1 + flg][strlen(argv[1 + flg]) - 1] != ':')
{
int len = strlen(argv[1 + flg]) + 2;
fprintf(stderr, "Algorithm name [%s] should be terminated with a "
"colon, fixing.\n", argv[1 + flg]);
algname = calloc(len, sizeof(char));
if (algname == NULL)
{
perror("calloc()");
exit(1);
}
strlcpy(algname, argv[1 + flg], len);
algname[strlen(algname)] = ':';
}
else
algname = argv[1 + flg];
/* Read assertion */
fd = open(argv[2 + flg], O_RDONLY);
if (fd == -1)
{
perror(argv[2 + flg]);
exit(1);
}
if (fstat(fd, &sb) == -1)
{
perror("fstat()");
exit(1);
}
if (sb.st_size == 0) /* Paranoid */
{
fprintf(stderr, "Error: zero-sized assertion-file.\n");
exit(1);
}
buflen = sb.st_size + 1;
buf = calloc(buflen, sizeof(char));
if (buf == NULL)
{
perror("calloc()");
exit(1);
}
if (read(fd, buf, buflen - 1) == -1)
{
perror("read()");
exit(1);
}
close(fd);
/* Read private key file */
fd = open(argv[3 + flg], O_RDONLY);
if (fd == -1)
{
perror(argv[3 + flg]);
exit(1);
}
if (fstat(fd, &sb) == -1)
{
perror("fstat()");
exit(1);
}
if (sb.st_size == 0) /* Paranoid */
{
fprintf(stderr, "Illegal key-file size 0\n");
exit(1);
}
buf2 = calloc(sb.st_size + 1, sizeof(char));
if (buf2 == NULL)
{
perror("calloc()");
exit(1);
}
if (read(fd, buf2, sb.st_size) == -1)
{
perror("read()");
exit(1);
}
close(fd);
sig = kn_sign_assertion(buf, buflen, buf2, algname, flg);
/* Free buffers */
free(buf);
free(buf2);
if (sig == NULL)
{
switch (keynote_errno)
{
case ERROR_MEMORY:
fprintf(stderr, "Out of memory while creating signature.\n");
break;
case ERROR_SYNTAX:
fprintf(stderr, "Bad assertion or algorithm format, or "
"unsupported algorithm while creating signature.\n");
break;
default:
fprintf(stderr, "Unknown error while creating signature.\n");
}
exit(1);
}
/* Print signature string */
print_key(stdout, "", sig, begin, prlen);
free(sig); /* Just a reminder that the result is malloc'ed */
exit(0);
}
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