diff options
Diffstat (limited to 'source/smbd/chgpasswd.c')
-rw-r--r-- | source/smbd/chgpasswd.c | 379 |
1 files changed, 0 insertions, 379 deletions
diff --git a/source/smbd/chgpasswd.c b/source/smbd/chgpasswd.c deleted file mode 100644 index 883ad5214a8..00000000000 --- a/source/smbd/chgpasswd.c +++ /dev/null @@ -1,379 +0,0 @@ -/* fork a child process to exec passwd and write to its -* tty to change a users password. This is running as the -* user who is attempting to change the password. -*/ - -/* - * This code was copied/borrowed and stolen from various sources. - * The primary source was the poppasswd.c from the authors of POPMail. This software - * was included as a client to change passwords using the 'passwd' program - * on the remote machine. - * - * This routine is called by set_user_password() in password.c only if ALLOW_PASSWORD_CHANGE - * is defined in the compiler directives located in the Makefile. - * - * This code has been hacked by Bob Nance (nance@niehs.nih.gov) and Evan Patterson - * (patters2@niehs.nih.gov) at the National Institute of Environmental Health Sciences - * and rights to modify, distribute or incorporate this change to the CAP suite or - * using it for any other reason are granted, so long as this disclaimer is left intact. - */ - -/* - This code was hacked considerably for inclusion in Samba, primarily - by Andrew.Tridgell@anu.edu.au. The biggest change was the addition - of the "password chat" option, which allows the easy runtime - specification of the expected sequence of events to change a - password. - */ - -#include "includes.h" - -extern int DEBUGLEVEL; - -#ifdef ALLOW_CHANGE_PASSWORD - -#define MINPASSWDLENGTH 5 -#define BUFSIZE 512 - -static int findpty(char **slave) -{ - int master; -#ifdef SVR4 - extern char *ptsname(); -#else - static char line[12]; - void *dirp; - char *dpname; -#endif - -#ifdef SVR4 - if ((master = open("/dev/ptmx", O_RDWR)) >= 1) { - grantpt(master); - unlockpt(master); - *slave = ptsname(master); - return (master); - } -#else - strcpy( line, "/dev/ptyXX" ); - - dirp = OpenDir("/dev"); - if (!dirp) return(-1); - while ((dpname = ReadDirName(dirp)) != NULL) { - if (strncmp(dpname, "pty", 3) == 0 && strlen(dpname) == 5) { - DEBUG(3,("pty: try to open %s, line was %s\n", dpname, line ) ); - line[8] = dpname[3]; - line[9] = dpname[4]; - if ((master = open(line, O_RDWR)) >= 0) { - DEBUG(3,("pty: opened %s\n", line ) ); - line[5] = 't'; - *slave = line; - CloseDir(dirp); - return (master); - } - } - } - CloseDir(dirp); -#endif - return (-1); -} - -static int dochild(int master,char *slavedev, char *name, char *passwordprogram) -{ - int slave; - struct termios stermios; - struct passwd *pass = Get_Pwnam(name,True); - int gid = pass->pw_gid; - int uid = pass->pw_uid; - -#ifdef USE_SETRES - setresuid(0,0,0); -#else - setuid(0); -#endif - - /* Start new session - gets rid of controlling terminal. */ - if (setsid() < 0) { - DEBUG(3,("Weirdness, couldn't let go of controlling terminal\n")); - return(False); - } - - /* Open slave pty and acquire as new controlling terminal. */ - if ((slave = open(slavedev, O_RDWR)) < 0) { - DEBUG(3,("More weirdness, could not open %s\n", - slavedev)); - return(False); - } -#ifdef SVR4 - ioctl(slave, I_PUSH, "ptem"); - ioctl(slave, I_PUSH, "ldterm"); -#else - if (ioctl(slave,TIOCSCTTY,0) <0) { - DEBUG(3,("Error in ioctl call for slave pty\n")); - /* return(False); */ - } -#endif - - /* Close master. */ - close(master); - - /* Make slave stdin/out/err of child. */ - - if (dup2(slave, STDIN_FILENO) != STDIN_FILENO) { - DEBUG(3,("Could not re-direct stdin\n")); - return(False); - } - if (dup2(slave, STDOUT_FILENO) != STDOUT_FILENO) { - DEBUG(3,("Could not re-direct stdout\n")); - return(False); - } - if (dup2(slave, STDERR_FILENO) != STDERR_FILENO) { - DEBUG(3,("Could not re-direct stderr\n")); - return(False); - } - if (slave > 2) close(slave); - - /* Set proper terminal attributes - no echo, canonical input processing, - no map NL to CR/NL on output. */ - - if (tcgetattr(0, &stermios) < 0) { - DEBUG(3,("could not read default terminal attributes on pty\n")); - return(False); - } - stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL); - stermios.c_lflag |= ICANON; - stermios.c_oflag &= ~(ONLCR); - if (tcsetattr(0, TCSANOW, &stermios) < 0) { - DEBUG(3,("could not set attributes of pty\n")); - return(False); - } - - /* make us completely into the right uid */ -#ifdef USE_SETRES - setresgid(0,0,0); - setresuid(0,0,0); - setresgid(gid,gid,gid); - setresuid(uid,uid,uid); -#else - setuid(0); - seteuid(0); - setgid(gid); - setegid(gid); - setuid(uid); - seteuid(uid); -#endif - - /* execl() password-change application */ - if (execl("/bin/sh","sh","-c",passwordprogram,NULL) < 0) { - DEBUG(3,("Bad status returned from %s\n",passwordprogram)); - return(False); - } - return(True); -} - -static int expect(int master,char *expected,char *buf) -{ - int n, m; - - n = 0; - buf[0] = 0; - while (1) { - if (n >= BUFSIZE-1) { - return False; - } - - /* allow 4 seconds for some output to appear */ - m = read_with_timeout(master, buf+n, 1, BUFSIZE-1-n, 4000); - if (m < 0) - return False; - - n += m; - buf[n] = 0; - - { - pstring s1,s2; - strcpy(s1,buf); - strcpy(s2,expected); - if (do_match(s1, s2, False)) - return(True); - } - } -} - -static void pwd_sub(char *buf) -{ - string_sub(buf,"\\n","\n"); - string_sub(buf,"\\r","\r"); - string_sub(buf,"\\s"," "); - string_sub(buf,"\\t","\t"); -} - -static void writestring(int fd,char *s) -{ - int l; - - l = strlen (s); - write (fd, s, l); -} - - -static int talktochild(int master, char *chatsequence) -{ - char buf[BUFSIZE]; - int count=0; - char *ptr=chatsequence; - fstring chatbuf; - - *buf = 0; - sleep(1); - - while (next_token(&ptr,chatbuf,NULL)) { - BOOL ok=True; - count++; - pwd_sub(chatbuf); - if (!strequal(chatbuf,".")) - ok = expect(master,chatbuf,buf); - -#if DEBUG_PASSWORD - DEBUG(100,("chatbuf=[%s] responsebuf=[%s]\n",chatbuf,buf)); -#endif - - if (!ok) { - DEBUG(3,("response %d incorrect\n",count)); - return(False); - } - - if (!next_token(&ptr,chatbuf,NULL)) break; - pwd_sub(chatbuf); - if (!strequal(chatbuf,".")) - writestring(master,chatbuf); - -#if DEBUG_PASSWORD - DEBUG(100,("sendbuf=[%s]\n",chatbuf)); -#endif - } - - if (count<1) return(False); - - return (True); -} - - -BOOL chat_with_program(char *passwordprogram,char *name,char *chatsequence) -{ - char *slavedev; - int master; - pid_t pid, wpid; - int wstat; - BOOL chstat; - - /* allocate a pseudo-terminal device */ - if ((master = findpty (&slavedev)) < 0) { - DEBUG(3,("Cannot Allocate pty for password change: %s",name)); - return(False); - } - - if ((pid = fork()) < 0) { - DEBUG(3,("Cannot fork() child for password change: %s",name)); - return(False); - } - - /* we now have a pty */ - if (pid > 0){ /* This is the parent process */ - if ((chstat = talktochild(master, chatsequence)) == False) { - DEBUG(3,("Child failed to change password: %s\n",name)); - kill(pid, SIGKILL); /* be sure to end this process */ - return(False); - } - if ((wpid = sys_waitpid(pid, &wstat, 0)) < 0) { - DEBUG(3,("The process is no longer waiting!\n\n")); - return(False); - } - if (pid != wpid) { - DEBUG(3,("We were waiting for the wrong process ID\n")); - return(False); - } - if (WIFEXITED(wstat) == 0) { - DEBUG(3,("The process exited while we were waiting\n")); - return(False); - } - if (WEXITSTATUS(wstat) != 0) { - DEBUG(3,("The status of the process exiting was %d\n", wstat)); - return(False); - } - - } else { - /* CHILD */ - - /* make sure it doesn't freeze */ - alarm(20); - - DEBUG(3,("Dochild for user %s (uid=%d,gid=%d)\n",name,getuid(),getgid())); - chstat = dochild(master, slavedev, name, passwordprogram); - } - DEBUG(3,("Password change %ssuccessful for user %s\n", (chstat?"":"un"), name)); - return (chstat); -} - - -BOOL chgpasswd(char *name,char *oldpass,char *newpass) -{ - pstring passwordprogram; - pstring chatsequence; - - strlower(name); - DEBUG(3,("Password change for user: %s\n",name)); - -#if DEBUG_PASSWORD - DEBUG(100,("Passwords: old=%s new=%s\n",oldpass,newpass)); -#endif - - /* Take the passed information and test it for minimum criteria */ - /* Minimum password length */ - if (strlen(newpass) < MINPASSWDLENGTH) /* too short, must be at least MINPASSWDLENGTH */ - { - DEBUG(2,("Password Change: %s, New password is shorter than MINPASSWDLENGTH\n",name)); - return (False); /* inform the user */ - } - - /* Password is same as old password */ - if (strcmp(oldpass,newpass) == 0) /* don't allow same password */ - { - DEBUG(2,("Password Change: %s, New password is same as old\n",name)); /* log the attempt */ - return (False); /* inform the user */ - } - -#if (defined(PASSWD_PROGRAM) && defined(PASSWD_CHAT)) - strcpy(passwordprogram,PASSWD_PROGRAM); - strcpy(chatsequence,PASSWD_CHAT); -#else - strcpy(passwordprogram,lp_passwd_program()); - strcpy(chatsequence,lp_passwd_chat()); -#endif - - if (!*chatsequence) { - DEBUG(2,("Null chat sequence - no password changing\n")); - return(False); - } - - if (!*passwordprogram) { - DEBUG(2,("Null password program - no password changing\n")); - return(False); - } - - string_sub(passwordprogram,"%u",name); - string_sub(passwordprogram,"%o",oldpass); - string_sub(passwordprogram,"%n",newpass); - - string_sub(chatsequence,"%u",name); - string_sub(chatsequence,"%o",oldpass); - string_sub(chatsequence,"%n",newpass); - return(chat_with_program(passwordprogram,name,chatsequence)); -} - -#else -BOOL chgpasswd(char *name,char *oldpass,char *newpass) -{ - DEBUG(0,("Password changing not compiled in (user=%s)\n",name)); - return(False); -} -#endif |