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1 | /* simple password generator by Nelson Minar (minar@reed.edu) | |
2 | * copyright 1991, all rights reserved. | |
3 | * You can use this code as long as my name stays with it. | |
4 | * | |
5 | * md5 patch by W. Campbell <wcampbel@botbay.net> | |
6 | * Modernization, getopt, etc for the Hybrid IRCD team | |
7 | * by W. Campbell | |
8 | * | |
9 | * /dev/random for salt generation added by | |
10 | * Aaron Sethman <androsyn@ratbox.org> | |
11 | */ | |
12 | #include <stdio.h> | |
13 | #include <string.h> | |
14 | #include <stdlib.h> | |
15 | #include <time.h> | |
16 | #include <unistd.h> | |
17 | #include <fcntl.h> | |
18 | #include "rb_lib.h" | |
19 | #ifndef __MINGW32__ | |
20 | #include <pwd.h> | |
21 | #endif | |
22 | ||
23 | #define FLAG_MD5 0x00000001 | |
24 | #define FLAG_SALT 0x00000002 | |
25 | #define FLAG_PASS 0x00000004 | |
26 | #define FLAG_LENGTH 0x00000008 | |
27 | #define FLAG_BLOWFISH 0x00000010 | |
28 | #define FLAG_ROUNDS 0x00000020 | |
29 | #define FLAG_SHA256 0x00000040 | |
30 | #define FLAG_SHA512 0x00000080 | |
31 | ||
32 | ||
33 | static char *make_md5_salt(int); | |
34 | static char *make_md5_salt_para(char *); | |
35 | static char *make_sha256_salt(int); | |
36 | static char *make_sha256_salt_para(char *); | |
37 | static char *make_sha512_salt(int); | |
38 | static char *make_sha512_salt_para(char *); | |
39 | static char *make_bf_salt(int, int); | |
40 | static char *make_bf_salt_para(int, char *); | |
41 | static char *generate_random_salt(char *, int); | |
42 | static char *generate_poor_salt(char *, int); | |
43 | ||
44 | static void full_usage(void) __attribute__((noreturn)); | |
45 | static void brief_usage(void) __attribute__((noreturn)); | |
46 | ||
47 | static char saltChars[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; | |
48 | /* 0 .. 63, ascii - 64 */ | |
49 | ||
50 | #ifdef __MINGW32__ | |
51 | #include <conio.h> | |
52 | #ifdef PASS_MAX | |
53 | #undef PASS_MAX | |
54 | #endif | |
55 | #define PASS_MAX 256 | |
56 | static char getpassbuf[PASS_MAX + 1]; | |
57 | ||
58 | static char * | |
59 | getpass(const char *prompt) | |
60 | { | |
61 | int c; | |
62 | int i = 0; | |
63 | ||
64 | memset(getpassbuf, 0, sizeof(getpassbuf)); | |
65 | fputs(prompt, stderr); | |
66 | for(;;) | |
67 | { | |
68 | c = _getch(); | |
69 | if(c == '\r') | |
70 | { | |
71 | getpassbuf[i] = '\0'; | |
72 | break; | |
73 | } | |
74 | else if(i < PASS_MAX) | |
75 | { | |
76 | getpassbuf[i++] = c; | |
77 | } | |
78 | } | |
79 | fputs("\r\n", stderr); | |
80 | ||
81 | return getpassbuf; | |
82 | } | |
83 | #endif | |
84 | ||
85 | ||
86 | int | |
87 | main(int argc, char *argv[]) | |
88 | { | |
89 | char *plaintext = NULL; | |
90 | int c; | |
91 | char *saltpara = NULL; | |
92 | char *salt; | |
93 | char *hashed, *hashed2; | |
94 | int flag = 0; | |
95 | int length = 0; /* Not Set */ | |
96 | int rounds = 0; /* Not set, since blowfish needs 4 by default, a side effect | |
97 | * of this being the encryption type parameter must be | |
98 | * specified before the rounds parameter. | |
99 | */ | |
100 | ||
101 | while((c = getopt(argc, argv, "xymbr:h?l:s:p:")) != -1) | |
102 | { | |
103 | switch (c) | |
104 | { | |
105 | case 'm': | |
106 | flag |= FLAG_MD5; | |
107 | break; | |
108 | case 'b': | |
109 | flag |= FLAG_BLOWFISH; | |
110 | rounds = 4; | |
111 | break; | |
112 | case 'l': | |
113 | flag |= FLAG_LENGTH; | |
114 | length = atoi(optarg); | |
115 | break; | |
116 | case 'r': | |
117 | flag |= FLAG_ROUNDS; | |
118 | rounds = atoi(optarg); | |
119 | break; | |
120 | case 's': | |
121 | flag |= FLAG_SALT; | |
122 | saltpara = optarg; | |
123 | break; | |
124 | case 'p': | |
125 | flag |= FLAG_PASS; | |
126 | plaintext = optarg; | |
127 | break; | |
128 | case 'x': | |
129 | flag |= FLAG_SHA256; | |
130 | break; | |
131 | case 'y': | |
132 | flag |= FLAG_SHA512; | |
133 | break; | |
134 | case 'h': | |
135 | full_usage(); | |
136 | /* NOT REACHED */ | |
137 | break; | |
138 | case '?': | |
139 | brief_usage(); | |
140 | /* NOT REACHED */ | |
141 | break; | |
142 | default: | |
143 | printf("Invalid Option: -%c\n", c); | |
144 | break; | |
145 | } | |
146 | } | |
147 | ||
148 | if(flag & FLAG_MD5) | |
149 | { | |
150 | if(length == 0) | |
151 | length = 8; | |
152 | if(flag & FLAG_SALT) | |
153 | salt = make_md5_salt_para(saltpara); | |
154 | else | |
155 | salt = make_md5_salt(length); | |
156 | } | |
157 | else if(flag & FLAG_BLOWFISH) | |
158 | { | |
159 | if(length == 0) | |
160 | length = 22; | |
161 | if(flag & FLAG_SALT) | |
162 | salt = make_bf_salt_para(rounds, saltpara); | |
163 | else | |
164 | salt = make_bf_salt(rounds, length); | |
165 | } | |
166 | else if(flag & FLAG_SHA256) | |
167 | { | |
168 | if(length == 0) | |
169 | length = 16; | |
170 | if(flag & FLAG_SALT) | |
171 | salt = make_sha256_salt_para(saltpara); | |
172 | else | |
173 | salt = make_sha256_salt(length); | |
174 | } | |
175 | else | |
176 | { | |
177 | if(length == 0) | |
178 | length = 16; | |
179 | if(flag & FLAG_SALT) | |
180 | salt = make_sha512_salt_para(saltpara); | |
181 | else | |
182 | salt = make_sha512_salt(length); | |
183 | } | |
184 | ||
185 | if(flag & FLAG_PASS) | |
186 | { | |
187 | if(!plaintext) | |
188 | { | |
189 | fprintf(stderr, "Please enter a valid password\n"); | |
190 | return 1; | |
191 | } | |
192 | ||
193 | hashed = rb_crypt(plaintext, salt); | |
194 | } | |
195 | else | |
196 | { | |
197 | plaintext = getpass("plaintext: "); | |
198 | hashed = rb_crypt(plaintext, salt); | |
199 | if (!hashed) | |
200 | { | |
201 | fprintf(stderr, "rb_crypt() failed\n"); | |
202 | return 1; | |
203 | } | |
204 | hashed = strdup(hashed); | |
205 | ||
206 | plaintext = getpass("again: "); | |
207 | hashed2 = rb_crypt(plaintext, salt); | |
208 | if (!hashed2) | |
209 | { | |
210 | fprintf(stderr, "rb_crypt() failed\n"); | |
211 | return 1; | |
212 | } | |
213 | ||
214 | if (strcmp(hashed, hashed2) != 0) | |
215 | { | |
216 | fprintf(stderr, "Passwords do not match\n"); | |
217 | return 1; | |
218 | } | |
219 | } | |
220 | ||
221 | printf("%s\n", hashed); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | char * | |
226 | make_md5_salt_para(char *saltpara) | |
227 | { | |
228 | static char salt[21]; | |
229 | if(saltpara && (strlen(saltpara) <= 16)) | |
230 | { | |
231 | /* sprintf used because of portability requirements, the length | |
232 | ** is checked above, so it should not be too much of a concern | |
233 | */ | |
234 | sprintf(salt, "$1$%s$", saltpara); | |
235 | return salt; | |
236 | } | |
237 | printf("Invalid Salt, please use up to 16 random alphanumeric characters\n"); | |
238 | exit(1); | |
239 | ||
240 | /* NOT REACHED */ | |
241 | return NULL; | |
242 | } | |
243 | ||
244 | char * | |
245 | make_md5_salt(int length) | |
246 | { | |
247 | static char salt[21]; | |
248 | if(length > 16) | |
249 | { | |
250 | printf("MD5 salt length too long\n"); | |
251 | exit(0); | |
252 | } | |
253 | salt[0] = '$'; | |
254 | salt[1] = '1'; | |
255 | salt[2] = '$'; | |
256 | generate_random_salt(&salt[3], length); | |
257 | salt[length + 3] = '$'; | |
258 | salt[length + 4] = '\0'; | |
259 | return salt; | |
260 | } | |
261 | ||
262 | char * | |
263 | make_sha256_salt_para(char *saltpara) | |
264 | { | |
265 | static char salt[21]; | |
266 | if(saltpara && (strlen(saltpara) <= 16)) | |
267 | { | |
268 | /* sprintf used because of portability requirements, the length | |
269 | ** is checked above, so it should not be too much of a concern | |
270 | */ | |
271 | sprintf(salt, "$5$%s$", saltpara); | |
272 | return salt; | |
273 | } | |
274 | printf("Invalid Salt, please use up to 16 random alphanumeric characters\n"); | |
275 | exit(1); | |
276 | ||
277 | /* NOT REACHED */ | |
278 | return NULL; | |
279 | } | |
280 | ||
281 | char * | |
282 | make_sha512_salt_para(char *saltpara) | |
283 | { | |
284 | static char salt[21]; | |
285 | if(saltpara && (strlen(saltpara) <= 16)) | |
286 | { | |
287 | /* sprintf used because of portability requirements, the length | |
288 | ** is checked above, so it should not be too much of a concern | |
289 | */ | |
290 | sprintf(salt, "$6$%s$", saltpara); | |
291 | return salt; | |
292 | } | |
293 | printf("Invalid Salt, please use up to 16 random alphanumeric characters\n"); | |
294 | exit(1); | |
295 | ||
296 | /* NOT REACHED */ | |
297 | return NULL; | |
298 | } | |
299 | ||
300 | ||
301 | char * | |
302 | make_sha256_salt(int length) | |
303 | { | |
304 | static char salt[21]; | |
305 | if(length > 16) | |
306 | { | |
307 | printf("SHA256 salt length too long\n"); | |
308 | exit(0); | |
309 | } | |
310 | salt[0] = '$'; | |
311 | salt[1] = '5'; | |
312 | salt[2] = '$'; | |
313 | generate_random_salt(&salt[3], length); | |
314 | salt[length + 3] = '$'; | |
315 | salt[length + 4] = '\0'; | |
316 | return salt; | |
317 | } | |
318 | ||
319 | char * | |
320 | make_sha512_salt(int length) | |
321 | { | |
322 | static char salt[21]; | |
323 | if(length > 16) | |
324 | { | |
325 | printf("SHA512 salt length too long\n"); | |
326 | exit(0); | |
327 | } | |
328 | salt[0] = '$'; | |
329 | salt[1] = '6'; | |
330 | salt[2] = '$'; | |
331 | generate_random_salt(&salt[3], length); | |
332 | salt[length + 3] = '$'; | |
333 | salt[length + 4] = '\0'; | |
334 | return salt; | |
335 | } | |
336 | ||
337 | char * | |
338 | make_bf_salt_para(int rounds, char *saltpara) | |
339 | { | |
340 | static char salt[31]; | |
341 | char tbuf[3]; | |
342 | if(saltpara && (strlen(saltpara) <= 22)) | |
343 | { | |
344 | /* sprintf used because of portability requirements, the length | |
345 | ** is checked above, so it should not be too much of a concern | |
346 | */ | |
347 | sprintf(tbuf, "%02d", rounds); | |
348 | sprintf(salt, "$2a$%s$%s$", tbuf, saltpara); | |
349 | return salt; | |
350 | } | |
351 | printf("Invalid Salt, please use up to 22 random alphanumeric characters\n"); | |
352 | exit(1); | |
353 | ||
354 | /* NOT REACHED */ | |
355 | return NULL; | |
356 | } | |
357 | ||
358 | char * | |
359 | make_bf_salt(int rounds, int length) | |
360 | { | |
361 | static char salt[31]; | |
362 | char tbuf[3]; | |
363 | if(length > 22) | |
364 | { | |
365 | printf("Blowfish salt length too long\n"); | |
366 | exit(0); | |
367 | } | |
368 | sprintf(tbuf, "%02d", rounds); | |
369 | sprintf(salt, "$2a$%s$", tbuf); | |
370 | generate_random_salt(&salt[7], length); | |
371 | salt[length + 7] = '$'; | |
372 | salt[length + 8] = '\0'; | |
373 | return salt; | |
374 | } | |
375 | ||
376 | char * | |
377 | generate_poor_salt(char *salt, int length) | |
378 | { | |
379 | int i; | |
380 | srand(time(NULL)); | |
381 | for(i = 0; i < length; i++) | |
382 | { | |
383 | salt[i] = saltChars[rand() % 64]; | |
384 | } | |
385 | return (salt); | |
386 | } | |
387 | ||
388 | char * | |
389 | generate_random_salt(char *salt, int length) | |
390 | { | |
391 | char *buf; | |
392 | int fd, i; | |
393 | if((fd = open("/dev/random", O_RDONLY)) < 0) | |
394 | { | |
395 | return (generate_poor_salt(salt, length)); | |
396 | } | |
397 | buf = calloc(1, length); | |
398 | if(read(fd, buf, length) != length) | |
399 | { | |
400 | free(buf); | |
401 | return (generate_poor_salt(salt, length)); | |
402 | } | |
403 | ||
404 | for(i = 0; i < length; i++) | |
405 | { | |
406 | salt[i] = saltChars[abs(buf[i]) % 64]; | |
407 | } | |
408 | free(buf); | |
409 | return (salt); | |
410 | } | |
411 | ||
412 | void | |
413 | full_usage() | |
414 | { | |
415 | printf("mkpasswd [-m|-b|-x|-y] [-l saltlength] [-r rounds] [-s salt] [-p plaintext]\n"); | |
416 | printf("-x Generate a SHA256 password\n"); | |
417 | printf("-y Generate a SHA512 password\n"); | |
418 | printf("-m Generate an MD5 password\n"); | |
419 | printf("-b Generate a Blowfish password\n"); | |
420 | printf("-l Specify a length for a random MD5 or Blowfish salt\n"); | |
421 | printf("-r Specify a number of rounds for a Blowfish password\n"); | |
422 | printf(" Default 4, no more than 6 recommended\n"); | |
423 | printf("-s Specify a salt, up to 16 for MD5, SHA256, and SHA512\n"); | |
424 | printf(" up to 22 for Blowfish\n"); | |
425 | printf("-p Specify a plaintext password to use\n"); | |
426 | printf("Example: mkpasswd -m -s 3dr -p test\n"); | |
427 | exit(0); | |
428 | } | |
429 | ||
430 | void | |
431 | brief_usage() | |
432 | { | |
433 | printf("mkpasswd - password hash generator\n"); | |
434 | printf(" SHA512: mkpasswd [-y] [-l saltlength] [-s salt] [-p plaintext]\n"); | |
435 | printf(" SHA256: mkpasswd -x [-l saltlength] [-s salt] [-p plaintext]\n"); | |
436 | printf(" MD5: mkpasswd -m [-l saltlength] [-s salt] [-p plaintext]\n"); | |
437 | printf("Blowfish: mkpasswd -b [-r rounds] [-l saltlength] [-s salt]\n"); | |
438 | printf(" [-p plaintext]\n"); | |
439 | printf("Use -h for full usage\n"); | |
440 | exit(0); | |
441 | } |