4 * Unix SMB/Netbios implementation. Version 1.9. smbpasswd module. Copyright
5 * (C) Jeremy Allison 1995-1997.
7 * This program is free software; you can redistribute it and/or modify it under
8 * the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc., 675
19 * Mass Ave, Cambridge, MA 02139, USA.
25 /* Static buffers we will return. */
26 static struct smb_passwd pw_buf;
27 static pstring user_name;
28 static unsigned char smbpwd[16];
29 static unsigned char smbntpwd[16];
31 static int gethexpwd(char *p, char *pwd)
34 unsigned char lonybble, hinybble;
35 char *hexchars = "0123456789ABCDEF";
37 for (i = 0; i < 32; i += 2) {
38 hinybble = toupper(p[i]);
39 lonybble = toupper(p[i + 1]);
41 p1 = strchr(hexchars, hinybble);
42 p2 = strchr(hexchars, lonybble);
46 hinybble = PTR_DIFF(p1, hexchars);
47 lonybble = PTR_DIFF(p2, hexchars);
49 pwd[i / 2] = (hinybble << 4) | lonybble;
55 _my_get_smbpwnam(FILE * fp, char *name, BOOL * valid_old_pwd,
56 BOOL *got_valid_nt_entry, long *pwd_seekpos)
65 * Scan the file, a line at a time and check if the name matches.
69 *pwd_seekpos = ftell(fp);
71 fgets(linebuf, 256, fp);
76 * Check if the string is terminated with a newline - if not
77 * then we must keep reading and discard until we get one.
79 linebuf_len = strlen(linebuf);
80 if (linebuf[linebuf_len - 1] != '\n') {
82 while (!ferror(fp) && !feof(fp)) {
88 linebuf[linebuf_len - 1] = '\0';
90 if ((linebuf[0] == 0) && feof(fp))
93 * The line we have should be of the form :-
95 * username:uid:[32hex bytes]:....other flags presently
100 * username:uid:[32hex bytes]:[32hex bytes]:....ignored....
102 * if Windows NT compatible passwords are also present.
105 if (linebuf[0] == '#' || linebuf[0] == '\0')
107 p = (unsigned char *) strchr(linebuf, ':');
111 * As 256 is shorter than a pstring we don't need to check
112 * length here - if this ever changes....
114 strncpy(user_name, linebuf, PTR_DIFF(p, linebuf));
115 user_name[PTR_DIFF(p, linebuf)] = '\0';
116 if (!strequal(user_name, name))
119 /* User name matches - get uid and password */
120 p++; /* Go past ':' */
124 uidval = atoi((char *) p);
125 while (*p && isdigit(*p))
132 * Now get the password value - this should be 32 hex digits
133 * which are the ascii representations of a 16 byte string.
134 * Get two at a time and put them into the password.
137 *pwd_seekpos += PTR_DIFF(p, linebuf); /* Save exact position
138 * of passwd in file -
141 if (*p == '*' || *p == 'X') {
142 /* Password deliberately invalid - end here. */
143 *valid_old_pwd = False;
144 *got_valid_nt_entry = False;
145 pw_buf.smb_nt_passwd = NULL; /* No NT password (yet)*/
147 /* Now check if the NT compatible password is
149 p += 33; /* Move to the first character of the line after
150 the lanman password. */
151 if ((linebuf_len >= (PTR_DIFF(p, linebuf) + 33)) && (p[32] == ':')) {
152 /* NT Entry was valid - even if 'X' or '*', can be overwritten */
153 *got_valid_nt_entry = True;
154 if (*p != '*' && *p != 'X') {
155 if (gethexpwd((char *)p,(char *)smbntpwd))
156 pw_buf.smb_nt_passwd = smbntpwd;
159 pw_buf.smb_name = user_name;
160 pw_buf.smb_userid = uidval;
161 pw_buf.smb_passwd = NULL; /* No password */
164 if (linebuf_len < (PTR_DIFF(p, linebuf) + 33))
170 if (!strncasecmp((char *)p, "NO PASSWORD", 11)) {
171 pw_buf.smb_passwd = NULL; /* No password */
173 if(!gethexpwd((char *)p,(char *)smbpwd))
175 pw_buf.smb_passwd = smbpwd;
178 pw_buf.smb_name = user_name;
179 pw_buf.smb_userid = uidval;
180 pw_buf.smb_nt_passwd = NULL;
181 *got_valid_nt_entry = False;
182 *valid_old_pwd = True;
184 /* Now check if the NT compatible password is
186 p += 33; /* Move to the first character of the line after
187 the lanman password. */
188 if ((linebuf_len >= (PTR_DIFF(p, linebuf) + 33)) && (p[32] == ':')) {
189 /* NT Entry was valid - even if 'X' or '*', can be overwritten */
190 *got_valid_nt_entry = True;
191 if (*p != '*' && *p != 'X') {
192 if (gethexpwd((char *)p,(char *)smbntpwd))
193 pw_buf.smb_nt_passwd = smbntpwd;
202 * Print command usage on stderr and die.
204 static void usage(char *name)
206 fprintf(stderr, "Usage is : %s [-add] [username] [password]\n", name);
210 int main(int argc, char **argv)
216 uchar old_nt_p16[16];
219 uchar new_nt_p16[16];
221 struct smb_passwd *smb_pwent;
223 BOOL valid_old_pwd = False;
224 BOOL got_valid_nt_entry = False;
225 BOOL add_user = False;
231 int ret, i, err, writelen;
233 char *pfile = SMB_PASSWD_FILE;
234 char readbuf[16 * 1024];
238 setup_logging(argv[0],True);
240 charset_initialise();
242 #ifndef DEBUG_PASSWORD
243 /* Check the effective uid */
244 if (geteuid() != 0) {
245 fprintf(stderr, "%s: Must be setuid root.\n", argv[0]);
250 /* Get the real uid */
253 /* Deal with usage problems */
256 /* As root we can change anothers password and add a user. */
260 else if (argc == 2 || argc > 3)
262 fprintf(stderr, "%s: Only root can set anothers password.\n", argv[0]);
266 if (real_uid == 0 && (argc > 1))
268 /* We are root - check if we should add the user */
269 if ((argv[1][0] == '-') && (argv[1][1] == 'a'))
272 if(add_user && (argc <= 2 || argc > 4))
275 /* root can specify password on command-line */
276 if (argc == (add_user ? 4 : 3))
278 /* -a argument (add_user): new password is 3rd argument. */
279 /* no -a argument (add_user): new password is 2nd argument */
281 add_pass = add_user ? 3 : 2;
284 /* If we are root we can change another's password. */
285 strncpy(user_name, add_user ? argv[2] : argv[1], sizeof(user_name) - 1);
286 user_name[sizeof(user_name) - 1] = '\0';
288 pwd = getpwnam(user_name);
292 /* non-root can specify old pass / new pass on command-line */
295 /* non-root specifies new password as 2nd argument */
299 pwd = getpwuid(real_uid);
303 fprintf(stderr, "%s: Unable to get UNIX password entry for user.\n", argv[0]);
307 /* If we are root we don't ask for the old password. */
308 old_passwd[0] = '\0';
313 /* old password, as non-root, is 1st argument */
314 strncpy(old_passwd, argv[1], sizeof(fstring));
318 p = getpass("Old SMB password:");
319 strncpy(old_passwd, p, sizeof(fstring));
321 old_passwd[sizeof(fstring)-1] = '\0';
326 /* new password is specified on the command line */
327 strncpy(new_passwd, argv[add_user ? 3 : 2], sizeof(new_passwd) - 1);
328 new_passwd[sizeof(new_passwd) - 1] = '\0';
332 new_passwd[0] = '\0';
334 p = getpass("New SMB password:");
336 strncpy(new_passwd, p, sizeof(fstring));
337 new_passwd[sizeof(fstring)-1] = '\0';
339 p = getpass("Retype new SMB password:");
341 if (strncmp(p, new_passwd, sizeof(fstring)-1))
343 fprintf(stderr, "%s: Mismatch - password unchanged.\n", argv[0]);
348 if (new_passwd[0] == '\0')
350 printf("Password not set\n");
354 /* Calculate the MD4 hash (NT compatible) of the old and new passwords */
355 memset(old_nt_p16, '\0', 16);
356 E_md4hash((uchar *)old_passwd, old_nt_p16);
358 memset(new_nt_p16, '\0', 16);
359 E_md4hash((uchar *) new_passwd, new_nt_p16);
361 /* Mangle the passwords into Lanman format */
362 old_passwd[14] = '\0';
363 strupper(old_passwd);
364 new_passwd[14] = '\0';
365 strupper(new_passwd);
368 * Calculate the SMB (lanman) hash functions of both old and new passwords.
371 memset(old_p16, '\0', 16);
372 E_P16((uchar *) old_passwd, old_p16);
374 memset(new_p16, '\0', 16);
375 E_P16((uchar *) new_passwd, new_p16);
378 * Open the smbpaswd file XXXX - we need to parse smb.conf to get the
381 if ((fp = fopen(pfile, "r+")) == NULL) {
383 fprintf(stderr, "%s: Failed to open password file %s.\n",
389 /* Set read buffer to 16k for effiecient reads */
390 setvbuf(fp, readbuf, _IOFBF, sizeof(readbuf));
392 /* make sure it is only rw by the owner */
395 /* Lock the smbpasswd file for write. */
396 if ((lockfd = pw_file_lock(pfile, F_WRLCK, 5)) < 0) {
398 fprintf(stderr, "%s: Failed to lock password file %s.\n",
405 /* Get the smb passwd entry for this user */
406 smb_pwent = _my_get_smbpwnam(fp, pwd->pw_name, &valid_old_pwd,
407 &got_valid_nt_entry, &seekpos);
408 if (smb_pwent == NULL) {
409 if(add_user == False) {
410 fprintf(stderr, "%s: Failed to find entry for user %s in file %s.\n",
411 argv[0], pwd->pw_name, pfile);
413 pw_file_unlock(lockfd);
417 /* Create a new smb passwd entry and set it to the given password. */
420 int new_entry_length;
424 /* The add user write needs to be atomic - so get the fd from
425 the fp and do a raw write() call.
429 if((offpos = lseek(fd, 0, SEEK_END)) == -1) {
430 fprintf(stderr, "%s: Failed to add entry for user %s to file %s. \
431 Error was %d\n", argv[0], pwd->pw_name, pfile, errno);
433 pw_file_unlock(lockfd);
437 new_entry_length = strlen(pwd->pw_name) + 1 + 15 + 1 +
438 32 + 1 + 32 + 1 + strlen(pwd->pw_gecos) +
439 1 + strlen(pwd->pw_dir) + 1 +
440 strlen(pwd->pw_shell) + 1;
441 if((new_entry = (char *)malloc( new_entry_length )) == 0) {
442 fprintf(stderr, "%s: Failed to add entry for user %s to file %s. \
443 Error was %d\n", argv[0], pwd->pw_name, pfile, errno);
445 pw_file_unlock(lockfd);
449 sprintf(new_entry, "%s:%u:", pwd->pw_name, pwd->pw_uid);
450 p = &new_entry[strlen(new_entry)];
451 for( i = 0; i < 16; i++)
452 sprintf(&p[i*2], "%02X", new_p16[i]);
455 for( i = 0; i < 16; i++)
456 sprintf(&p[i*2], "%02X", new_nt_p16[i]);
459 sprintf(p, "%s:%s:%s\n", pwd->pw_gecos,
460 pwd->pw_dir, pwd->pw_shell);
461 if(write(fd, new_entry, strlen(new_entry)) != strlen(new_entry)) {
462 fprintf(stderr, "%s: Failed to add entry for user %s to file %s. \
463 Error was %d\n", argv[0], pwd->pw_name, pfile, errno);
464 /* Remove the entry we just wrote. */
465 if(ftruncate(fd, offpos) == -1) {
466 fprintf(stderr, "%s: ERROR failed to ftruncate file %s. \
467 Error was %d. Password file may be corrupt ! Please examine by hand !\n",
468 argv[0], pwd->pw_name, errno);
471 pw_file_unlock(lockfd);
476 pw_file_unlock(lockfd);
481 /* If we are root or the password is 'NO PASSWORD' then
482 we don't need to check the old password. */
484 if (valid_old_pwd == False) {
485 fprintf(stderr, "%s: User %s has no old SMB password.\n", argv[0], pwd->pw_name);
487 /* Check the old Lanman password - NULL means 'NO PASSWORD' */
488 if (smb_pwent->smb_passwd != NULL) {
489 if (memcmp(old_p16, smb_pwent->smb_passwd, 16)) {
490 fprintf(stderr, "%s: Couldn't change password.\n", argv[0]);
492 pw_file_unlock(lockfd);
496 /* Check the NT password if it exists */
497 if (smb_pwent->smb_nt_passwd != NULL) {
498 if (memcmp(old_nt_p16, smb_pwent->smb_nt_passwd, 16)) {
499 fprintf(stderr, "%s: Couldn't change password.\n", argv[0]);
501 pw_file_unlock(lockfd);
507 * If we get here either we were root or the old password checked out
510 /* Create the 32 byte representation of the new p16 */
511 for (i = 0; i < 16; i++) {
512 sprintf(&ascii_p16[i * 2], "%02X", (uchar) new_p16[i]);
514 if(got_valid_nt_entry) {
515 /* Add on the NT md4 hash */
517 for (i = 0; i < 16; i++) {
518 sprintf(&ascii_p16[(i * 2)+33], "%02X", (uchar) new_nt_p16[i]);
522 * Do an atomic write into the file at the position defined by
526 ret = lseek(pwfd, seekpos - 1, SEEK_SET);
527 if (ret != seekpos - 1) {
529 fprintf(stderr, "%s: seek fail on file %s.\n",
534 pw_file_unlock(lockfd);
537 /* Sanity check - ensure the character is a ':' */
538 if (read(pwfd, &c, 1) != 1) {
540 fprintf(stderr, "%s: read fail on file %s.\n",
545 pw_file_unlock(lockfd);
549 fprintf(stderr, "%s: sanity check on passwd file %s failed.\n",
552 pw_file_unlock(lockfd);
555 writelen = (got_valid_nt_entry) ? 65 : 32;
556 if (write(pwfd, ascii_p16, writelen) != writelen) {
558 fprintf(stderr, "%s: write fail in file %s.\n",
563 pw_file_unlock(lockfd);
567 pw_file_unlock(lockfd);
568 printf("Password changed\n");
574 #include "includes.h"
577 main(int argc, char **argv)
579 printf("smb password encryption not selected in Makefile\n");