441 lines
9 KiB
C
441 lines
9 KiB
C
/* simple password generator by Nelson Minar (minar@reed.edu)
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* copyright 1991, all rights reserved.
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* You can use this code as long as my name stays with it.
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*
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* md5 patch by W. Campbell <wcampbel@botbay.net>
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* Modernization, getopt, etc for the Hybrid IRCD team
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* by W. Campbell
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*
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* /dev/random for salt generation added by
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* Aaron Sethman <androsyn@ratbox.org>
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "rb_lib.h"
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#ifndef __MINGW32__
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#include <pwd.h>
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#endif
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#define FLAG_MD5 0x00000001
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#define FLAG_SALT 0x00000002
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#define FLAG_PASS 0x00000004
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#define FLAG_LENGTH 0x00000008
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#define FLAG_BLOWFISH 0x00000010
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#define FLAG_ROUNDS 0x00000020
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#define FLAG_SHA256 0x00000040
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#define FLAG_SHA512 0x00000080
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static char *make_md5_salt(int);
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static char *make_md5_salt_para(char *);
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static char *make_sha256_salt(int);
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static char *make_sha256_salt_para(char *);
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static char *make_sha512_salt(int);
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static char *make_sha512_salt_para(char *);
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static char *make_bf_salt(int, int);
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static char *make_bf_salt_para(int, char *);
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static char *generate_random_salt(char *, int);
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static char *generate_poor_salt(char *, int);
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static void full_usage(void) __attribute__((noreturn));
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static void brief_usage(void) __attribute__((noreturn));
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static char saltChars[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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/* 0 .. 63, ascii - 64 */
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#ifdef __MINGW32__
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#include <conio.h>
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#ifdef PASS_MAX
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#undef PASS_MAX
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#endif
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#define PASS_MAX 256
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static char getpassbuf[PASS_MAX + 1];
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static char *
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getpass(const char *prompt)
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{
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int c;
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int i = 0;
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memset(getpassbuf, 0, sizeof(getpassbuf));
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fputs(prompt, stderr);
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for(;;)
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{
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c = _getch();
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if(c == '\r')
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{
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getpassbuf[i] = '\0';
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break;
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}
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else if(i < PASS_MAX)
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{
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getpassbuf[i++] = c;
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}
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}
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fputs("\r\n", stderr);
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return getpassbuf;
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}
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#endif
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int
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main(int argc, char *argv[])
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{
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char *plaintext = NULL;
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int c;
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char *saltpara = NULL;
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char *salt;
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char *hashed, *hashed2;
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int flag = 0;
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int length = 0; /* Not Set */
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int rounds = 0; /* Not set, since blowfish needs 4 by default, a side effect
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* of this being the encryption type parameter must be
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* specified before the rounds parameter.
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*/
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while((c = getopt(argc, argv, "xymbr:h?l:s:p:")) != -1)
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{
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switch (c)
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{
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case 'm':
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flag |= FLAG_MD5;
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break;
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case 'b':
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flag |= FLAG_BLOWFISH;
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rounds = 4;
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break;
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case 'l':
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flag |= FLAG_LENGTH;
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length = atoi(optarg);
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break;
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case 'r':
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flag |= FLAG_ROUNDS;
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rounds = atoi(optarg);
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break;
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case 's':
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flag |= FLAG_SALT;
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saltpara = optarg;
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break;
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case 'p':
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flag |= FLAG_PASS;
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plaintext = optarg;
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break;
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case 'x':
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flag |= FLAG_SHA256;
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break;
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case 'y':
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flag |= FLAG_SHA512;
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break;
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case 'h':
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full_usage();
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/* NOT REACHED */
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break;
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case '?':
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brief_usage();
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/* NOT REACHED */
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break;
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default:
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printf("Invalid Option: -%c\n", c);
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break;
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}
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}
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if(flag & FLAG_MD5)
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{
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if(length == 0)
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length = 8;
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if(flag & FLAG_SALT)
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salt = make_md5_salt_para(saltpara);
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else
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salt = make_md5_salt(length);
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}
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else if(flag & FLAG_BLOWFISH)
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{
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if(length == 0)
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length = 22;
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if(flag & FLAG_SALT)
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salt = make_bf_salt_para(rounds, saltpara);
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else
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salt = make_bf_salt(rounds, length);
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}
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else if(flag & FLAG_SHA256)
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{
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if(length == 0)
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length = 16;
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if(flag & FLAG_SALT)
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salt = make_sha256_salt_para(saltpara);
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else
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salt = make_sha256_salt(length);
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}
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else
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{
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if(length == 0)
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length = 16;
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if(flag & FLAG_SALT)
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salt = make_sha512_salt_para(saltpara);
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else
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salt = make_sha512_salt(length);
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}
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if(flag & FLAG_PASS)
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{
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if(!plaintext)
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{
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fprintf(stderr, "Please enter a valid password\n");
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return 1;
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}
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hashed = rb_crypt(plaintext, salt);
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}
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else
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{
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plaintext = getpass("plaintext: ");
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hashed = rb_crypt(plaintext, salt);
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if (!hashed)
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{
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fprintf(stderr, "rb_crypt() failed\n");
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return 1;
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}
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hashed = strdup(hashed);
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plaintext = getpass("again: ");
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hashed2 = rb_crypt(plaintext, salt);
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if (!hashed2)
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{
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fprintf(stderr, "rb_crypt() failed\n");
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return 1;
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}
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if (strcmp(hashed, hashed2) != 0)
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{
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fprintf(stderr, "Passwords do not match\n");
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return 1;
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}
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}
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printf("%s\n", hashed);
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return 0;
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}
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char *
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make_md5_salt_para(char *saltpara)
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{
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static char salt[21];
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if(saltpara && (strlen(saltpara) <= 16))
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{
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/* sprintf used because of portability requirements, the length
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** is checked above, so it should not be too much of a concern
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*/
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sprintf(salt, "$1$%s$", saltpara);
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return salt;
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}
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printf("Invalid Salt, please use up to 16 random alphanumeric characters\n");
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exit(1);
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/* NOT REACHED */
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return NULL;
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}
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char *
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make_md5_salt(int length)
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{
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static char salt[21];
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if(length > 16)
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{
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printf("MD5 salt length too long\n");
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exit(0);
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}
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salt[0] = '$';
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salt[1] = '1';
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salt[2] = '$';
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generate_random_salt(&salt[3], length);
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salt[length + 3] = '$';
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salt[length + 4] = '\0';
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return salt;
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}
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char *
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make_sha256_salt_para(char *saltpara)
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{
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static char salt[21];
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if(saltpara && (strlen(saltpara) <= 16))
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{
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/* sprintf used because of portability requirements, the length
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** is checked above, so it should not be too much of a concern
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*/
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sprintf(salt, "$5$%s$", saltpara);
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return salt;
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}
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printf("Invalid Salt, please use up to 16 random alphanumeric characters\n");
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exit(1);
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/* NOT REACHED */
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return NULL;
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}
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char *
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make_sha512_salt_para(char *saltpara)
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{
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static char salt[21];
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if(saltpara && (strlen(saltpara) <= 16))
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{
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/* sprintf used because of portability requirements, the length
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** is checked above, so it should not be too much of a concern
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*/
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sprintf(salt, "$6$%s$", saltpara);
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return salt;
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}
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printf("Invalid Salt, please use up to 16 random alphanumeric characters\n");
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exit(1);
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/* NOT REACHED */
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return NULL;
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}
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char *
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make_sha256_salt(int length)
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{
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static char salt[21];
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if(length > 16)
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{
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printf("SHA256 salt length too long\n");
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exit(0);
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}
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salt[0] = '$';
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salt[1] = '5';
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salt[2] = '$';
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generate_random_salt(&salt[3], length);
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salt[length + 3] = '$';
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salt[length + 4] = '\0';
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return salt;
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}
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char *
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make_sha512_salt(int length)
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{
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static char salt[21];
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if(length > 16)
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{
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printf("SHA512 salt length too long\n");
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exit(0);
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}
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salt[0] = '$';
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salt[1] = '6';
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salt[2] = '$';
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generate_random_salt(&salt[3], length);
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salt[length + 3] = '$';
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salt[length + 4] = '\0';
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return salt;
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}
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char *
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make_bf_salt_para(int rounds, char *saltpara)
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{
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static char salt[31];
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char tbuf[3];
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if(saltpara && (strlen(saltpara) <= 22))
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{
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/* sprintf used because of portability requirements, the length
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** is checked above, so it should not be too much of a concern
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*/
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sprintf(tbuf, "%02d", rounds);
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sprintf(salt, "$2a$%s$%s$", tbuf, saltpara);
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return salt;
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}
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printf("Invalid Salt, please use up to 22 random alphanumeric characters\n");
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exit(1);
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/* NOT REACHED */
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return NULL;
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}
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char *
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make_bf_salt(int rounds, int length)
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{
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static char salt[31];
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char tbuf[3];
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if(length > 22)
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{
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printf("Blowfish salt length too long\n");
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exit(0);
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}
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sprintf(tbuf, "%02d", rounds);
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sprintf(salt, "$2a$%s$", tbuf);
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generate_random_salt(&salt[7], length);
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salt[length + 7] = '$';
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salt[length + 8] = '\0';
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return salt;
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}
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char *
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generate_poor_salt(char *salt, int length)
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{
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int i;
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srand(time(NULL));
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for(i = 0; i < length; i++)
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{
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salt[i] = saltChars[rand() % 64];
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}
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return (salt);
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}
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char *
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generate_random_salt(char *salt, int length)
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{
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char *buf;
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int fd, i;
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if((fd = open("/dev/random", O_RDONLY)) < 0)
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{
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return (generate_poor_salt(salt, length));
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}
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buf = calloc(1, length);
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if(read(fd, buf, length) != length)
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{
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free(buf);
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return (generate_poor_salt(salt, length));
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}
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for(i = 0; i < length; i++)
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{
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salt[i] = saltChars[abs(buf[i]) % 64];
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}
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free(buf);
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return (salt);
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}
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void
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full_usage()
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{
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printf("mkpasswd [-m|-b|-x|-y] [-l saltlength] [-r rounds] [-s salt] [-p plaintext]\n");
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printf("-x Generate a SHA256 password\n");
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printf("-y Generate a SHA512 password\n");
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printf("-m Generate an MD5 password\n");
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printf("-b Generate a Blowfish password\n");
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printf("-l Specify a length for a random MD5 or Blowfish salt\n");
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printf("-r Specify a number of rounds for a Blowfish password\n");
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printf(" Default 4, no more than 6 recommended\n");
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printf("-s Specify a salt, up to 16 for MD5, SHA256, and SHA512\n");
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printf(" up to 22 for Blowfish\n");
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printf("-p Specify a plaintext password to use\n");
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printf("Example: mkpasswd -m -s 3dr -p test\n");
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exit(0);
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}
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void
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brief_usage()
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{
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printf("mkpasswd - password hash generator\n");
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printf(" SHA512: mkpasswd [-y] [-l saltlength] [-s salt] [-p plaintext]\n");
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printf(" SHA256: mkpasswd -x [-l saltlength] [-s salt] [-p plaintext]\n");
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printf(" MD5: mkpasswd -m [-l saltlength] [-s salt] [-p plaintext]\n");
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printf("Blowfish: mkpasswd -b [-r rounds] [-l saltlength] [-s salt]\n");
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printf(" [-p plaintext]\n");
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printf("Use -h for full usage\n");
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exit(0);
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}
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