1 /*
2  * Copyright 2000-2022 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the Apache License 2.0 (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9 
10 #include <string.h>
11 
12 #include "apps.h"
13 #include "progs.h"
14 
15 #include <openssl/bio.h>
16 #include <openssl/err.h>
17 #include <openssl/evp.h>
18 #include <openssl/rand.h>
19 #if !defined(OPENSSL_NO_DES) && !defined(OPENSSL_NO_DEPRECATED_3_0)
20 # include <openssl/des.h>
21 #endif
22 #include <openssl/md5.h>
23 #include <openssl/sha.h>
24 
25 static const unsigned char cov_2char[64] = {
26     /* from crypto/des/fcrypt.c */
27     0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
28     0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
29     0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
30     0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
31     0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
32     0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
33     0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
34     0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
35 };
36 
37 static const char ascii_dollar[] = { 0x24, 0x00 };
38 
39 typedef enum {
40     passwd_unset = 0,
41     passwd_md5,
42     passwd_apr1,
43     passwd_sha256,
44     passwd_sha512,
45     passwd_aixmd5
46 } passwd_modes;
47 
48 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
49                      char *passwd, BIO *out, int quiet, int table,
50                      int reverse, size_t pw_maxlen, passwd_modes mode);
51 
52 typedef enum OPTION_choice {
53     OPT_COMMON,
54     OPT_IN,
55     OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
56     OPT_1, OPT_5, OPT_6, OPT_AIXMD5, OPT_SALT, OPT_STDIN,
57     OPT_R_ENUM, OPT_PROV_ENUM
58 } OPTION_CHOICE;
59 
60 const OPTIONS passwd_options[] = {
61     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [password]\n"},
62 
63     OPT_SECTION("General"),
64     {"help", OPT_HELP, '-', "Display this summary"},
65 
66     OPT_SECTION("Input"),
67     {"in", OPT_IN, '<', "Read passwords from file"},
68     {"noverify", OPT_NOVERIFY, '-',
69      "Never verify when reading password from terminal"},
70     {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
71 
72     OPT_SECTION("Output"),
73     {"quiet", OPT_QUIET, '-', "No warnings"},
74     {"table", OPT_TABLE, '-', "Format output as table"},
75     {"reverse", OPT_REVERSE, '-', "Switch table columns"},
76 
77     OPT_SECTION("Cryptographic"),
78     {"salt", OPT_SALT, 's', "Use provided salt"},
79     {"6", OPT_6, '-', "SHA512-based password algorithm"},
80     {"5", OPT_5, '-', "SHA256-based password algorithm"},
81     {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
82     {"1", OPT_1, '-', "MD5-based password algorithm"},
83     {"aixmd5", OPT_AIXMD5, '-', "AIX MD5-based password algorithm"},
84 
85     OPT_R_OPTIONS,
86     OPT_PROV_OPTIONS,
87 
88     OPT_PARAMETERS(),
89     {"password", 0, 0, "Password text to digest (optional)"},
90     {NULL}
91 };
92 
passwd_main(int argc,char ** argv)93 int passwd_main(int argc, char **argv)
94 {
95     BIO *in = NULL;
96     char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
97     char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
98     OPTION_CHOICE o;
99     int in_stdin = 0, pw_source_defined = 0;
100 #ifndef OPENSSL_NO_UI_CONSOLE
101     int in_noverify = 0;
102 #endif
103     int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
104     int ret = 1;
105     passwd_modes mode = passwd_unset;
106     size_t passwd_malloc_size = 0;
107     size_t pw_maxlen = 256; /* arbitrary limit, should be enough for most
108                              * passwords */
109 
110     prog = opt_init(argc, argv, passwd_options);
111     while ((o = opt_next()) != OPT_EOF) {
112         switch (o) {
113         case OPT_EOF:
114         case OPT_ERR:
115  opthelp:
116             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
117             goto end;
118         case OPT_HELP:
119             opt_help(passwd_options);
120             ret = 0;
121             goto end;
122         case OPT_IN:
123             if (pw_source_defined)
124                 goto opthelp;
125             infile = opt_arg();
126             pw_source_defined = 1;
127             break;
128         case OPT_NOVERIFY:
129 #ifndef OPENSSL_NO_UI_CONSOLE
130             in_noverify = 1;
131 #endif
132             break;
133         case OPT_QUIET:
134             quiet = 1;
135             break;
136         case OPT_TABLE:
137             table = 1;
138             break;
139         case OPT_REVERSE:
140             reverse = 1;
141             break;
142         case OPT_1:
143             if (mode != passwd_unset)
144                 goto opthelp;
145             mode = passwd_md5;
146             break;
147         case OPT_5:
148             if (mode != passwd_unset)
149                 goto opthelp;
150             mode = passwd_sha256;
151             break;
152         case OPT_6:
153             if (mode != passwd_unset)
154                 goto opthelp;
155             mode = passwd_sha512;
156             break;
157         case OPT_APR1:
158             if (mode != passwd_unset)
159                 goto opthelp;
160             mode = passwd_apr1;
161             break;
162         case OPT_AIXMD5:
163             if (mode != passwd_unset)
164                 goto opthelp;
165             mode = passwd_aixmd5;
166             break;
167         case OPT_SALT:
168             passed_salt = 1;
169             salt = opt_arg();
170             break;
171         case OPT_STDIN:
172             if (pw_source_defined)
173                 goto opthelp;
174             in_stdin = 1;
175             pw_source_defined = 1;
176             break;
177         case OPT_R_CASES:
178             if (!opt_rand(o))
179                 goto end;
180             break;
181         case OPT_PROV_CASES:
182             if (!opt_provider(o))
183                 goto end;
184             break;
185         }
186     }
187 
188     /* All remaining arguments are the password text */
189     argc = opt_num_rest();
190     argv = opt_rest();
191     if (*argv != NULL) {
192         if (pw_source_defined)
193             goto opthelp;
194         pw_source_defined = 1;
195         passwds = argv;
196     }
197 
198     if (!app_RAND_load())
199         goto end;
200 
201     if (mode == passwd_unset) {
202         /* use default */
203         mode = passwd_md5;
204     }
205 
206     if (infile != NULL && in_stdin) {
207         BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
208         goto end;
209     }
210 
211     if (infile != NULL || in_stdin) {
212         /*
213          * If in_stdin is true, we know that infile is NULL, and that
214          * bio_open_default() will give us back an alias for stdin.
215          */
216         in = bio_open_default(infile, 'r', FORMAT_TEXT);
217         if (in == NULL)
218             goto end;
219     }
220 
221     if (passwds == NULL) {
222         /* no passwords on the command line */
223 
224         passwd_malloc_size = pw_maxlen + 2;
225         /* longer than necessary so that we can warn about truncation */
226         passwd = passwd_malloc =
227             app_malloc(passwd_malloc_size, "password buffer");
228     }
229 
230     if ((in == NULL) && (passwds == NULL)) {
231         /*
232          * we use the following method to make sure what
233          * in the 'else' section is always compiled, to
234          * avoid rot of not-frequently-used code.
235          */
236         if (1) {
237 #ifndef OPENSSL_NO_UI_CONSOLE
238             /* build a null-terminated list */
239             static char *passwds_static[2] = { NULL, NULL };
240 
241             passwds = passwds_static;
242             if (in == NULL) {
243                 if (EVP_read_pw_string
244                     (passwd_malloc, passwd_malloc_size, "Password: ",
245                      !(passed_salt || in_noverify)) != 0)
246                     goto end;
247             }
248             passwds[0] = passwd_malloc;
249         } else {
250 #endif
251             BIO_printf(bio_err, "password required\n");
252             goto end;
253         }
254     }
255 
256     if (in == NULL) {
257         assert(passwds != NULL);
258         assert(*passwds != NULL);
259 
260         do {                    /* loop over list of passwords */
261             passwd = *passwds++;
262             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
263                            quiet, table, reverse, pw_maxlen, mode))
264                 goto end;
265         } while (*passwds != NULL);
266     } else {
267         /* in != NULL */
268         int done;
269 
270         assert(passwd != NULL);
271         do {
272             int r = BIO_gets(in, passwd, pw_maxlen + 1);
273             if (r > 0) {
274                 char *c = (strchr(passwd, '\n'));
275                 if (c != NULL) {
276                     *c = 0;     /* truncate at newline */
277                 } else {
278                     /* ignore rest of line */
279                     char trash[BUFSIZ];
280                     do
281                         r = BIO_gets(in, trash, sizeof(trash));
282                     while ((r > 0) && (!strchr(trash, '\n')));
283                 }
284 
285                 if (!do_passwd
286                     (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
287                      table, reverse, pw_maxlen, mode))
288                     goto end;
289             }
290             done = (r <= 0);
291         } while (!done);
292     }
293     ret = 0;
294 
295  end:
296 #if 0
297     ERR_print_errors(bio_err);
298 #endif
299     OPENSSL_free(salt_malloc);
300     OPENSSL_free(passwd_malloc);
301     BIO_free(in);
302     return ret;
303 }
304 
305 /*
306  * MD5-based password algorithm (should probably be available as a library
307  * function; then the static buffer would not be acceptable). For magic
308  * string "1", this should be compatible to the MD5-based BSD password
309  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
310  * Apache password algorithm. (Apparently, the Apache password algorithm is
311  * identical except that the 'magic' string was changed -- the laziest
312  * application of the NIH principle I've ever encountered.)
313  */
md5crypt(const char * passwd,const char * magic,const char * salt)314 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
315 {
316     /* "$apr1$..salt..$.......md5hash..........\0" */
317     static char out_buf[6 + 9 + 24 + 2];
318     unsigned char buf[MD5_DIGEST_LENGTH];
319     char ascii_magic[5];         /* "apr1" plus '\0' */
320     char ascii_salt[9];          /* Max 8 chars plus '\0' */
321     char *ascii_passwd = NULL;
322     char *salt_out;
323     int n;
324     unsigned int i;
325     EVP_MD_CTX *md = NULL, *md2 = NULL;
326     size_t passwd_len, salt_len, magic_len;
327 
328     passwd_len = strlen(passwd);
329 
330     out_buf[0] = 0;
331     magic_len = strlen(magic);
332     OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));
333 #ifdef CHARSET_EBCDIC
334     if ((magic[0] & 0x80) != 0)    /* High bit is 1 in EBCDIC alnums */
335         ebcdic2ascii(ascii_magic, ascii_magic, magic_len);
336 #endif
337 
338     /* The salt gets truncated to 8 chars */
339     OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));
340     salt_len = strlen(ascii_salt);
341 #ifdef CHARSET_EBCDIC
342     ebcdic2ascii(ascii_salt, ascii_salt, salt_len);
343 #endif
344 
345 #ifdef CHARSET_EBCDIC
346     ascii_passwd = OPENSSL_strdup(passwd);
347     if (ascii_passwd == NULL)
348         return NULL;
349     ebcdic2ascii(ascii_passwd, ascii_passwd, passwd_len);
350     passwd = ascii_passwd;
351 #endif
352 
353     if (magic_len > 0) {
354         OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
355 
356         if (magic_len > 4)    /* assert it's  "1" or "apr1" */
357             goto err;
358 
359         OPENSSL_strlcat(out_buf, ascii_magic, sizeof(out_buf));
360         OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
361     }
362 
363     OPENSSL_strlcat(out_buf, ascii_salt, sizeof(out_buf));
364 
365     if (strlen(out_buf) > 6 + 8) /* assert "$apr1$..salt.." */
366         goto err;
367 
368     salt_out = out_buf;
369     if (magic_len > 0)
370         salt_out += 2 + magic_len;
371 
372     if (salt_len > 8)
373         goto err;
374 
375     md = EVP_MD_CTX_new();
376     if (md == NULL
377         || !EVP_DigestInit_ex(md, EVP_md5(), NULL)
378         || !EVP_DigestUpdate(md, passwd, passwd_len))
379         goto err;
380 
381     if (magic_len > 0)
382         if (!EVP_DigestUpdate(md, ascii_dollar, 1)
383             || !EVP_DigestUpdate(md, ascii_magic, magic_len)
384             || !EVP_DigestUpdate(md, ascii_dollar, 1))
385           goto err;
386 
387     if (!EVP_DigestUpdate(md, ascii_salt, salt_len))
388         goto err;
389 
390     md2 = EVP_MD_CTX_new();
391     if (md2 == NULL
392         || !EVP_DigestInit_ex(md2, EVP_md5(), NULL)
393         || !EVP_DigestUpdate(md2, passwd, passwd_len)
394         || !EVP_DigestUpdate(md2, ascii_salt, salt_len)
395         || !EVP_DigestUpdate(md2, passwd, passwd_len)
396         || !EVP_DigestFinal_ex(md2, buf, NULL))
397         goto err;
398 
399     for (i = passwd_len; i > sizeof(buf); i -= sizeof(buf)) {
400         if (!EVP_DigestUpdate(md, buf, sizeof(buf)))
401             goto err;
402     }
403     if (!EVP_DigestUpdate(md, buf, i))
404         goto err;
405 
406     n = passwd_len;
407     while (n) {
408         if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
409             goto err;
410         n >>= 1;
411     }
412     if (!EVP_DigestFinal_ex(md, buf, NULL))
413         goto err;
414 
415     for (i = 0; i < 1000; i++) {
416         if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
417             goto err;
418         if (!EVP_DigestUpdate(md2,
419                               (i & 1) ? (const unsigned char *)passwd : buf,
420                               (i & 1) ? passwd_len : sizeof(buf)))
421             goto err;
422         if (i % 3) {
423             if (!EVP_DigestUpdate(md2, ascii_salt, salt_len))
424                 goto err;
425         }
426         if (i % 7) {
427             if (!EVP_DigestUpdate(md2, passwd, passwd_len))
428                 goto err;
429         }
430         if (!EVP_DigestUpdate(md2,
431                               (i & 1) ? buf : (const unsigned char *)passwd,
432                               (i & 1) ? sizeof(buf) : passwd_len))
433                 goto err;
434         if (!EVP_DigestFinal_ex(md2, buf, NULL))
435                 goto err;
436     }
437     EVP_MD_CTX_free(md2);
438     EVP_MD_CTX_free(md);
439     md2 = NULL;
440     md = NULL;
441 
442     {
443         /* transform buf into output string */
444         unsigned char buf_perm[sizeof(buf)];
445         int dest, source;
446         char *output;
447 
448         /* silly output permutation */
449         for (dest = 0, source = 0; dest < 14;
450              dest++, source = (source + 6) % 17)
451             buf_perm[dest] = buf[source];
452         buf_perm[14] = buf[5];
453         buf_perm[15] = buf[11];
454 # ifndef PEDANTIC              /* Unfortunately, this generates a "no
455                                  * effect" warning */
456         assert(16 == sizeof(buf_perm));
457 # endif
458 
459         output = salt_out + salt_len;
460         assert(output == out_buf + strlen(out_buf));
461 
462         *output++ = ascii_dollar[0];
463 
464         for (i = 0; i < 15; i += 3) {
465             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
466             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
467                                   (buf_perm[i + 2] >> 6)];
468             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
469                                   (buf_perm[i + 1] >> 4)];
470             *output++ = cov_2char[buf_perm[i] >> 2];
471         }
472         assert(i == 15);
473         *output++ = cov_2char[buf_perm[i] & 0x3f];
474         *output++ = cov_2char[buf_perm[i] >> 6];
475         *output = 0;
476         assert(strlen(out_buf) < sizeof(out_buf));
477 #ifdef CHARSET_EBCDIC
478         ascii2ebcdic(out_buf, out_buf, strlen(out_buf));
479 #endif
480     }
481 
482     return out_buf;
483 
484  err:
485     OPENSSL_free(ascii_passwd);
486     EVP_MD_CTX_free(md2);
487     EVP_MD_CTX_free(md);
488     return NULL;
489 }
490 
491 /*
492  * SHA based password algorithm, describe by Ulrich Drepper here:
493  * https://www.akkadia.org/drepper/SHA-crypt.txt
494  * (note that it's in the public domain)
495  */
shacrypt(const char * passwd,const char * magic,const char * salt)496 static char *shacrypt(const char *passwd, const char *magic, const char *salt)
497 {
498     /* Prefix for optional rounds specification.  */
499     static const char rounds_prefix[] = "rounds=";
500     /* Maximum salt string length.  */
501 # define SALT_LEN_MAX 16
502     /* Default number of rounds if not explicitly specified.  */
503 # define ROUNDS_DEFAULT 5000
504     /* Minimum number of rounds.  */
505 # define ROUNDS_MIN 1000
506     /* Maximum number of rounds.  */
507 # define ROUNDS_MAX 999999999
508 
509     /* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */
510     static char out_buf[3 + 17 + 17 + 86 + 1];
511     unsigned char buf[SHA512_DIGEST_LENGTH];
512     unsigned char temp_buf[SHA512_DIGEST_LENGTH];
513     size_t buf_size = 0;
514     char ascii_magic[2];
515     char ascii_salt[17];          /* Max 16 chars plus '\0' */
516     char *ascii_passwd = NULL;
517     size_t n;
518     EVP_MD_CTX *md = NULL, *md2 = NULL;
519     const EVP_MD *sha = NULL;
520     size_t passwd_len, salt_len, magic_len;
521     unsigned int rounds = ROUNDS_DEFAULT;        /* Default */
522     char rounds_custom = 0;
523     char *p_bytes = NULL;
524     char *s_bytes = NULL;
525     char *cp = NULL;
526 
527     passwd_len = strlen(passwd);
528     magic_len = strlen(magic);
529 
530     /* assert it's "5" or "6" */
531     if (magic_len != 1)
532         return NULL;
533 
534     switch (magic[0]) {
535     case '5':
536         sha = EVP_sha256();
537         buf_size = 32;
538         break;
539     case '6':
540         sha = EVP_sha512();
541         buf_size = 64;
542         break;
543     default:
544         return NULL;
545     }
546 
547     if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {
548         const char *num = salt + sizeof(rounds_prefix) - 1;
549         char *endp;
550         unsigned long int srounds = strtoul (num, &endp, 10);
551         if (*endp == '$') {
552             salt = endp + 1;
553             if (srounds > ROUNDS_MAX)
554                 rounds = ROUNDS_MAX;
555             else if (srounds < ROUNDS_MIN)
556                 rounds = ROUNDS_MIN;
557             else
558                 rounds = (unsigned int)srounds;
559             rounds_custom = 1;
560         } else {
561             return NULL;
562         }
563     }
564 
565     OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));
566 #ifdef CHARSET_EBCDIC
567     if ((magic[0] & 0x80) != 0)    /* High bit is 1 in EBCDIC alnums */
568         ebcdic2ascii(ascii_magic, ascii_magic, magic_len);
569 #endif
570 
571     /* The salt gets truncated to 16 chars */
572     OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));
573     salt_len = strlen(ascii_salt);
574 #ifdef CHARSET_EBCDIC
575     ebcdic2ascii(ascii_salt, ascii_salt, salt_len);
576 #endif
577 
578 #ifdef CHARSET_EBCDIC
579     ascii_passwd = OPENSSL_strdup(passwd);
580     if (ascii_passwd == NULL)
581         return NULL;
582     ebcdic2ascii(ascii_passwd, ascii_passwd, passwd_len);
583     passwd = ascii_passwd;
584 #endif
585 
586     out_buf[0] = 0;
587     OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
588     OPENSSL_strlcat(out_buf, ascii_magic, sizeof(out_buf));
589     OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
590     if (rounds_custom) {
591         char tmp_buf[80]; /* "rounds=999999999" */
592         sprintf(tmp_buf, "rounds=%u", rounds);
593 #ifdef CHARSET_EBCDIC
594         /* In case we're really on a ASCII based platform and just pretend */
595         if (tmp_buf[0] != 0x72)  /* ASCII 'r' */
596             ebcdic2ascii(tmp_buf, tmp_buf, strlen(tmp_buf));
597 #endif
598         OPENSSL_strlcat(out_buf, tmp_buf, sizeof(out_buf));
599         OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
600     }
601     OPENSSL_strlcat(out_buf, ascii_salt, sizeof(out_buf));
602 
603     /* assert "$5$rounds=999999999$......salt......" */
604     if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len )
605         goto err;
606 
607     md = EVP_MD_CTX_new();
608     if (md == NULL
609         || !EVP_DigestInit_ex(md, sha, NULL)
610         || !EVP_DigestUpdate(md, passwd, passwd_len)
611         || !EVP_DigestUpdate(md, ascii_salt, salt_len))
612         goto err;
613 
614     md2 = EVP_MD_CTX_new();
615     if (md2 == NULL
616         || !EVP_DigestInit_ex(md2, sha, NULL)
617         || !EVP_DigestUpdate(md2, passwd, passwd_len)
618         || !EVP_DigestUpdate(md2, ascii_salt, salt_len)
619         || !EVP_DigestUpdate(md2, passwd, passwd_len)
620         || !EVP_DigestFinal_ex(md2, buf, NULL))
621         goto err;
622 
623     for (n = passwd_len; n > buf_size; n -= buf_size) {
624         if (!EVP_DigestUpdate(md, buf, buf_size))
625             goto err;
626     }
627     if (!EVP_DigestUpdate(md, buf, n))
628         goto err;
629 
630     n = passwd_len;
631     while (n) {
632         if (!EVP_DigestUpdate(md,
633                               (n & 1) ? buf : (const unsigned char *)passwd,
634                               (n & 1) ? buf_size : passwd_len))
635             goto err;
636         n >>= 1;
637     }
638     if (!EVP_DigestFinal_ex(md, buf, NULL))
639         goto err;
640 
641     /* P sequence */
642     if (!EVP_DigestInit_ex(md2, sha, NULL))
643         goto err;
644 
645     for (n = passwd_len; n > 0; n--)
646         if (!EVP_DigestUpdate(md2, passwd, passwd_len))
647             goto err;
648 
649     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
650         goto err;
651 
652     if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL)
653         goto err;
654     for (cp = p_bytes, n = passwd_len; n > buf_size; n -= buf_size, cp += buf_size)
655         memcpy(cp, temp_buf, buf_size);
656     memcpy(cp, temp_buf, n);
657 
658     /* S sequence */
659     if (!EVP_DigestInit_ex(md2, sha, NULL))
660         goto err;
661 
662     for (n = 16 + buf[0]; n > 0; n--)
663         if (!EVP_DigestUpdate(md2, ascii_salt, salt_len))
664             goto err;
665 
666     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
667         goto err;
668 
669     if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL)
670         goto err;
671     for (cp = s_bytes, n = salt_len; n > buf_size; n -= buf_size, cp += buf_size)
672         memcpy(cp, temp_buf, buf_size);
673     memcpy(cp, temp_buf, n);
674 
675     for (n = 0; n < rounds; n++) {
676         if (!EVP_DigestInit_ex(md2, sha, NULL))
677             goto err;
678         if (!EVP_DigestUpdate(md2,
679                               (n & 1) ? (const unsigned char *)p_bytes : buf,
680                               (n & 1) ? passwd_len : buf_size))
681             goto err;
682         if (n % 3) {
683             if (!EVP_DigestUpdate(md2, s_bytes, salt_len))
684                 goto err;
685         }
686         if (n % 7) {
687             if (!EVP_DigestUpdate(md2, p_bytes, passwd_len))
688                 goto err;
689         }
690         if (!EVP_DigestUpdate(md2,
691                               (n & 1) ? buf : (const unsigned char *)p_bytes,
692                               (n & 1) ? buf_size : passwd_len))
693                 goto err;
694         if (!EVP_DigestFinal_ex(md2, buf, NULL))
695                 goto err;
696     }
697     EVP_MD_CTX_free(md2);
698     EVP_MD_CTX_free(md);
699     md2 = NULL;
700     md = NULL;
701     OPENSSL_free(p_bytes);
702     OPENSSL_free(s_bytes);
703     p_bytes = NULL;
704     s_bytes = NULL;
705 
706     cp = out_buf + strlen(out_buf);
707     *cp++ = ascii_dollar[0];
708 
709 # define b64_from_24bit(B2, B1, B0, N)                                   \
710     do {                                                                \
711         unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);             \
712         int i = (N);                                                    \
713         while (i-- > 0)                                                 \
714             {                                                           \
715                 *cp++ = cov_2char[w & 0x3f];                            \
716                 w >>= 6;                                                \
717             }                                                           \
718     } while (0)
719 
720     switch (magic[0]) {
721     case '5':
722         b64_from_24bit (buf[0], buf[10], buf[20], 4);
723         b64_from_24bit (buf[21], buf[1], buf[11], 4);
724         b64_from_24bit (buf[12], buf[22], buf[2], 4);
725         b64_from_24bit (buf[3], buf[13], buf[23], 4);
726         b64_from_24bit (buf[24], buf[4], buf[14], 4);
727         b64_from_24bit (buf[15], buf[25], buf[5], 4);
728         b64_from_24bit (buf[6], buf[16], buf[26], 4);
729         b64_from_24bit (buf[27], buf[7], buf[17], 4);
730         b64_from_24bit (buf[18], buf[28], buf[8], 4);
731         b64_from_24bit (buf[9], buf[19], buf[29], 4);
732         b64_from_24bit (0, buf[31], buf[30], 3);
733         break;
734     case '6':
735         b64_from_24bit (buf[0], buf[21], buf[42], 4);
736         b64_from_24bit (buf[22], buf[43], buf[1], 4);
737         b64_from_24bit (buf[44], buf[2], buf[23], 4);
738         b64_from_24bit (buf[3], buf[24], buf[45], 4);
739         b64_from_24bit (buf[25], buf[46], buf[4], 4);
740         b64_from_24bit (buf[47], buf[5], buf[26], 4);
741         b64_from_24bit (buf[6], buf[27], buf[48], 4);
742         b64_from_24bit (buf[28], buf[49], buf[7], 4);
743         b64_from_24bit (buf[50], buf[8], buf[29], 4);
744         b64_from_24bit (buf[9], buf[30], buf[51], 4);
745         b64_from_24bit (buf[31], buf[52], buf[10], 4);
746         b64_from_24bit (buf[53], buf[11], buf[32], 4);
747         b64_from_24bit (buf[12], buf[33], buf[54], 4);
748         b64_from_24bit (buf[34], buf[55], buf[13], 4);
749         b64_from_24bit (buf[56], buf[14], buf[35], 4);
750         b64_from_24bit (buf[15], buf[36], buf[57], 4);
751         b64_from_24bit (buf[37], buf[58], buf[16], 4);
752         b64_from_24bit (buf[59], buf[17], buf[38], 4);
753         b64_from_24bit (buf[18], buf[39], buf[60], 4);
754         b64_from_24bit (buf[40], buf[61], buf[19], 4);
755         b64_from_24bit (buf[62], buf[20], buf[41], 4);
756         b64_from_24bit (0, 0, buf[63], 2);
757         break;
758     default:
759         goto err;
760     }
761     *cp = '\0';
762 #ifdef CHARSET_EBCDIC
763     ascii2ebcdic(out_buf, out_buf, strlen(out_buf));
764 #endif
765 
766     return out_buf;
767 
768  err:
769     EVP_MD_CTX_free(md2);
770     EVP_MD_CTX_free(md);
771     OPENSSL_free(p_bytes);
772     OPENSSL_free(s_bytes);
773     OPENSSL_free(ascii_passwd);
774     return NULL;
775 }
776 
do_passwd(int passed_salt,char ** salt_p,char ** salt_malloc_p,char * passwd,BIO * out,int quiet,int table,int reverse,size_t pw_maxlen,passwd_modes mode)777 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
778                      char *passwd, BIO *out, int quiet, int table,
779                      int reverse, size_t pw_maxlen, passwd_modes mode)
780 {
781     char *hash = NULL;
782 
783     assert(salt_p != NULL);
784     assert(salt_malloc_p != NULL);
785 
786     /* first make sure we have a salt */
787     if (!passed_salt) {
788         size_t saltlen = 0;
789         size_t i;
790 
791         if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5)
792             saltlen = 8;
793 
794         if (mode == passwd_sha256 || mode == passwd_sha512)
795             saltlen = 16;
796 
797         assert(saltlen != 0);
798 
799         if (*salt_malloc_p == NULL)
800             *salt_p = *salt_malloc_p = app_malloc(saltlen + 1, "salt buffer");
801         if (RAND_bytes((unsigned char *)*salt_p, saltlen) <= 0)
802             goto end;
803 
804         for (i = 0; i < saltlen; i++)
805             (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
806         (*salt_p)[i] = 0;
807 # ifdef CHARSET_EBCDIC
808         /* The password encryption function will convert back to ASCII */
809         ascii2ebcdic(*salt_p, *salt_p, saltlen);
810 # endif
811     }
812 
813     assert(*salt_p != NULL);
814 
815     /* truncate password if necessary */
816     if ((strlen(passwd) > pw_maxlen)) {
817         if (!quiet)
818             /*
819              * XXX: really we should know how to print a size_t, not cast it
820              */
821             BIO_printf(bio_err,
822                        "Warning: truncating password to %u characters\n",
823                        (unsigned)pw_maxlen);
824         passwd[pw_maxlen] = 0;
825     }
826     assert(strlen(passwd) <= pw_maxlen);
827 
828     /* now compute password hash */
829     if (mode == passwd_md5 || mode == passwd_apr1)
830         hash = md5crypt(passwd, (mode == passwd_md5 ? "1" : "apr1"), *salt_p);
831     if (mode == passwd_aixmd5)
832         hash = md5crypt(passwd, "", *salt_p);
833     if (mode == passwd_sha256 || mode == passwd_sha512)
834         hash = shacrypt(passwd, (mode == passwd_sha256 ? "5" : "6"), *salt_p);
835     assert(hash != NULL);
836 
837     if (table && !reverse)
838         BIO_printf(out, "%s\t%s\n", passwd, hash);
839     else if (table && reverse)
840         BIO_printf(out, "%s\t%s\n", hash, passwd);
841     else
842         BIO_printf(out, "%s\n", hash);
843     return 1;
844 
845  end:
846     return 0;
847 }
848