2 Unix SMB/Netbios implementation.
4 Samba utility functions
5 Copyright (C) Andrew Tridgell 1992-1997
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* fork a child process to exec passwd and write to its
23 * tty to change a users password. This is running as the
24 * user who is attempting to change the password.
28 * This code was copied/borrowed and stolen from various sources.
29 * The primary source was the poppasswd.c from the authors of POPMail. This software
30 * was included as a client to change passwords using the 'passwd' program
31 * on the remote machine.
33 * This routine is called by set_user_password() in password.c only if ALLOW_PASSWORD_CHANGE
34 * is defined in the compiler directives located in the Makefile.
36 * This code has been hacked by Bob Nance (nance@niehs.nih.gov) and Evan Patterson
37 * (patters2@niehs.nih.gov) at the National Institute of Environmental Health Sciences
38 * and rights to modify, distribute or incorporate this change to the CAP suite or
39 * using it for any other reason are granted, so long as this disclaimer is left intact.
43 This code was hacked considerably for inclusion in Samba, primarily
44 by Andrew.Tridgell@anu.edu.au. The biggest change was the addition
45 of the "password chat" option, which allows the easy runtime
46 specification of the expected sequence of events to change a
52 extern int DEBUGLEVEL;
54 #ifdef ALLOW_CHANGE_PASSWORD
56 #define MINPASSWDLENGTH 5
59 static int findpty(char **slave)
62 #if defined(SVR4) || defined(SUNOS5)
63 extern char *ptsname();
64 #else /* defined(SVR4) || defined(SUNOS5) */
68 #endif /* defined(SVR4) || defined(SUNOS5) */
70 #if defined(SVR4) || defined(SUNOS5)
71 if ((master = open("/dev/ptmx", O_RDWR)) >= 1) {
74 *slave = ptsname(master);
77 #else /* defined(SVR4) || defined(SUNOS5) */
78 strcpy( line, "/dev/ptyXX" );
80 dirp = OpenDir(-1, "/dev", True);
81 if (!dirp) return(-1);
82 while ((dpname = ReadDirName(dirp)) != NULL) {
83 if (strncmp(dpname, "pty", 3) == 0 && strlen(dpname) == 5) {
84 DEBUG(3,("pty: try to open %s, line was %s\n", dpname, line ) );
87 if ((master = open(line, O_RDWR)) >= 0) {
88 DEBUG(3,("pty: opened %s\n", line ) );
97 #endif /* defined(SVR4) || defined(SUNOS5) */
101 static int dochild(int master,char *slavedev, char *name, char *passwordprogram)
104 struct termios stermios;
105 struct passwd *pass = Get_Pwnam(name,True);
106 int gid = pass->pw_gid;
107 int uid = pass->pw_uid;
111 #else /* USE_SETRES */
113 #endif /* USE_SETRES */
115 /* Start new session - gets rid of controlling terminal. */
117 DEBUG(3,("Weirdness, couldn't let go of controlling terminal\n"));
121 /* Open slave pty and acquire as new controlling terminal. */
122 if ((slave = open(slavedev, O_RDWR)) < 0) {
123 DEBUG(3,("More weirdness, could not open %s\n",
127 #if defined(SVR4) || defined(SUNOS5)
128 ioctl(slave, I_PUSH, "ptem");
129 ioctl(slave, I_PUSH, "ldterm");
130 #else /* defined(SVR4) || defined(SUNOS5) */
131 if (ioctl(slave,TIOCSCTTY,0) <0) {
132 DEBUG(3,("Error in ioctl call for slave pty\n"));
135 #endif /* defined(SVR4) || defined(SUNOS5) */
140 /* Make slave stdin/out/err of child. */
142 if (dup2(slave, STDIN_FILENO) != STDIN_FILENO) {
143 DEBUG(3,("Could not re-direct stdin\n"));
146 if (dup2(slave, STDOUT_FILENO) != STDOUT_FILENO) {
147 DEBUG(3,("Could not re-direct stdout\n"));
150 if (dup2(slave, STDERR_FILENO) != STDERR_FILENO) {
151 DEBUG(3,("Could not re-direct stderr\n"));
154 if (slave > 2) close(slave);
156 /* Set proper terminal attributes - no echo, canonical input processing,
157 no map NL to CR/NL on output. */
159 if (tcgetattr(0, &stermios) < 0) {
160 DEBUG(3,("could not read default terminal attributes on pty\n"));
163 stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
164 stermios.c_lflag |= ICANON;
165 stermios.c_oflag &= ~(ONLCR);
166 if (tcsetattr(0, TCSANOW, &stermios) < 0) {
167 DEBUG(3,("could not set attributes of pty\n"));
171 /* make us completely into the right uid */
175 setresgid(gid,gid,gid);
176 setresuid(uid,uid,uid);
186 /* execl() password-change application */
187 if (execl("/bin/sh","sh","-c",passwordprogram,NULL) < 0) {
188 DEBUG(3,("Bad status returned from %s\n",passwordprogram));
194 static int expect(int master,char *expected,char *buf)
201 if (n >= BUFSIZE-1) {
205 /* allow 4 seconds for some output to appear */
206 m = read_with_timeout(master, buf+n, 1, BUFSIZE-1-n, 4000);
217 if (do_match(s1, s2, False))
223 static void pwd_sub(char *buf)
225 string_sub(buf,"\\n","\n");
226 string_sub(buf,"\\r","\r");
227 string_sub(buf,"\\s"," ");
228 string_sub(buf,"\\t","\t");
231 static void writestring(int fd,char *s)
240 static int talktochild(int master, char *chatsequence)
244 char *ptr=chatsequence;
250 while (next_token(&ptr,chatbuf,NULL)) {
254 if (!strequal(chatbuf,"."))
255 ok = expect(master,chatbuf,buf);
258 DEBUG(100,("chatbuf=[%s] responsebuf=[%s]\n",chatbuf,buf));
262 DEBUG(3,("response %d incorrect\n",count));
266 if (!next_token(&ptr,chatbuf,NULL)) break;
268 if (!strequal(chatbuf,"."))
269 writestring(master,chatbuf);
272 DEBUG(100,("sendbuf=[%s]\n",chatbuf));
276 if (count<1) return(False);
282 BOOL chat_with_program(char *passwordprogram,char *name,char *chatsequence)
290 /* allocate a pseudo-terminal device */
291 if ((master = findpty (&slavedev)) < 0) {
292 DEBUG(3,("Cannot Allocate pty for password change: %s",name));
296 if ((pid = fork()) < 0) {
297 DEBUG(3,("Cannot fork() child for password change: %s",name));
301 /* we now have a pty */
302 if (pid > 0){ /* This is the parent process */
303 if ((chstat = talktochild(master, chatsequence)) == False) {
304 DEBUG(3,("Child failed to change password: %s\n",name));
305 kill(pid, SIGKILL); /* be sure to end this process */
308 if ((wpid = sys_waitpid(pid, &wstat, 0)) < 0) {
309 DEBUG(3,("The process is no longer waiting!\n\n"));
313 DEBUG(3,("We were waiting for the wrong process ID\n"));
316 if (WIFEXITED(wstat) == 0) {
317 DEBUG(3,("The process exited while we were waiting\n"));
320 if (WEXITSTATUS(wstat) != 0) {
321 DEBUG(3,("The status of the process exiting was %d\n", wstat));
328 /* make sure it doesn't freeze */
331 DEBUG(3,("Dochild for user %s (uid=%d,gid=%d)\n",name,getuid(),getgid()));
332 chstat = dochild(master, slavedev, name, passwordprogram);
334 DEBUG(3,("Password change %ssuccessful for user %s\n", (chstat?"":"un"), name));
339 BOOL chgpasswd(char *name,char *oldpass,char *newpass)
341 pstring passwordprogram;
342 pstring chatsequence;
345 DEBUG(3,("Password change for user: %s\n",name));
348 DEBUG(100,("Passwords: old=%s new=%s\n",oldpass,newpass));
351 /* Take the passed information and test it for minimum criteria */
352 /* Minimum password length */
353 if (strlen(newpass) < MINPASSWDLENGTH) /* too short, must be at least MINPASSWDLENGTH */
355 DEBUG(2,("Password Change: %s, New password is shorter than MINPASSWDLENGTH\n",name));
356 return (False); /* inform the user */
359 /* Password is same as old password */
360 if (strcmp(oldpass,newpass) == 0) /* don't allow same password */
362 DEBUG(2,("Password Change: %s, New password is same as old\n",name)); /* log the attempt */
363 return (False); /* inform the user */
366 #if (defined(PASSWD_PROGRAM) && defined(PASSWD_CHAT))
367 strcpy(passwordprogram,PASSWD_PROGRAM);
368 strcpy(chatsequence,PASSWD_CHAT);
370 strcpy(passwordprogram,lp_passwd_program());
371 strcpy(chatsequence,lp_passwd_chat());
374 if (!*chatsequence) {
375 DEBUG(2,("Null chat sequence - no password changing\n"));
379 if (!*passwordprogram) {
380 DEBUG(2,("Null password program - no password changing\n"));
384 string_sub(passwordprogram,"%u",name);
385 string_sub(passwordprogram,"%o",oldpass);
386 string_sub(passwordprogram,"%n",newpass);
388 string_sub(chatsequence,"%u",name);
389 string_sub(chatsequence,"%o",oldpass);
390 string_sub(chatsequence,"%n",newpass);
391 return(chat_with_program(passwordprogram,name,chatsequence));
395 BOOL chgpasswd(char *name,char *oldpass,char *newpass)
397 DEBUG(0,("Password changing not compiled in (user=%s)\n",name));