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