diff options
Diffstat (limited to 'source3/smbd/chgpasswd.c')
| -rw-r--r-- | source3/smbd/chgpasswd.c | 1157 |
1 files changed, 859 insertions, 298 deletions
diff --git a/source3/smbd/chgpasswd.c b/source3/smbd/chgpasswd.c index dc0514c1ed..eed535cf11 100644 --- a/source3/smbd/chgpasswd.c +++ b/source3/smbd/chgpasswd.c @@ -1,8 +1,28 @@ -/* 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. +/* + Unix SMB/CIFS implementation. + Samba utility functions + Copyright (C) Andrew Tridgell 1992-1998 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +/* 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 @@ -27,350 +47,891 @@ */ #include "includes.h" -#include "loadparm.h" -extern int DEBUGLEVEL; +extern struct passdb_ops pdb_ops; -#ifdef ALLOW_CHANGE_PASSWORD +static BOOL check_oem_password(const char *user, + uchar * lmdata, const uchar * lmhash, + const uchar * ntdata, const uchar * nthash, + SAM_ACCOUNT **hnd, char *new_passwd, + int new_passwd_size); -#define MINPASSWDLENGTH 5 -#define BUFSIZE 512 +#if ALLOW_CHANGE_PASSWORD static int findpty(char **slave) { - int master; -#ifdef SVR4 - extern char *ptsname(); -#else - static char line[12] = "/dev/ptyXX"; - 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 - dirp = OpenDir("/dev"); - if (!dirp) return(-1); - while ((dpname = ReadDirName(dirp)) != NULL) { - if (strncmp(dpname, "pty", 3) == 0 && strlen(dpname) == 5) { - line[8] = dpname[3]; - line[9] = dpname[4]; - if ((master = open(line, O_RDWR)) >= 0) { - line[5] = 't'; - *slave = line; - CloseDir(dirp); - return (master); - } - } - } - CloseDir(dirp); -#endif - return (-1); + int master; + static fstring line; + DIR *dirp; + char *dpname; + +#if defined(HAVE_GRANTPT) + /* Try to open /dev/ptmx. If that fails, fall through to old method. */ + if ((master = sys_open("/dev/ptmx", O_RDWR, 0)) >= 0) + { + grantpt(master); + unlockpt(master); + *slave = (char *)ptsname(master); + if (*slave == NULL) + { + DEBUG(0, + ("findpty: Unable to create master/slave pty pair.\n")); + /* Stop fd leak on error. */ + close(master); + return -1; + } + else + { + DEBUG(10, + ("findpty: Allocated slave pty %s\n", *slave)); + return (master); + } + } +#endif /* HAVE_GRANTPT */ + + fstrcpy(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 = sys_open(line, O_RDWR, 0)) >= 0) + { + DEBUG(3, ("pty: opened %s\n", line)); + line[5] = 't'; + *slave = line; + closedir(dirp); + return (master); + } + } + } + closedir(dirp); + return (-1); } -static int dochild(int master,char *slavedev, char *name, char *passwordprogram) +static int dochild(int master, const char *slavedev, const struct passwd *pass, + const char *passwordprogram, BOOL as_root) { - 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); + int slave; + struct termios stermios; + gid_t gid; + uid_t uid; + + if (pass == NULL) + { + DEBUG(0, + ("dochild: user doesn't exist in the UNIX password database.\n")); + return False; + } + + gid = pass->pw_gid; + uid = pass->pw_uid; + + gain_root_privilege(); + + /* 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 = sys_open(slavedev, O_RDWR, 0)) < 0) + { + DEBUG(3, ("More weirdness, could not open %s\n", slavedev)); + return (False); + } +#ifdef I_PUSH + ioctl(slave, I_PUSH, "ptem"); + ioctl(slave, I_PUSH, "ldterm"); +#elif defined(TIOCSCTTY) + if (ioctl(slave, TIOCSCTTY, 0) < 0) + { + DEBUG(3, ("Error in ioctl call for slave pty\n")); + /* return(False); */ + } #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); + /* 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 */ + if (!as_root) + { + become_user_permanently(uid, gid); + } + + DEBUG(10, + ("Invoking '%s' as password change program.\n", + passwordprogram)); + + /* 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) +static int expect(int master, char *issue, char *expected) { - 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, True); - 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); - } - } + pstring buffer; + int attempts, timeout, nread, len; + BOOL match = False; + + for (attempts = 0; attempts < 2; attempts++) { + if (!strequal(issue, ".")) { + if (lp_passwd_chat_debug()) + DEBUG(100, ("expect: sending [%s]\n", issue)); + + if ((len = write(master, issue, strlen(issue))) != strlen(issue)) { + DEBUG(2,("expect: (short) write returned %d\n", len )); + return False; + } + } + + if (strequal(expected, ".")) + return True; + + timeout = 2000; + nread = 0; + buffer[nread] = 0; + + while ((len = read_with_timeout(master, buffer + nread, 1, + sizeof(buffer) - nread - 1, + timeout)) > 0) { + nread += len; + buffer[nread] = 0; + + { + /* Eat leading/trailing whitespace before match. */ + pstring str; + pstrcpy( str, buffer); + trim_string( str, " ", " "); + + if ((match = (unix_wild_match(expected, str) == 0))) + timeout = 200; + } + } + + if (lp_passwd_chat_debug()) + DEBUG(100, ("expect: expected [%s] received [%s] match %s\n", + expected, buffer, match ? "yes" : "no" )); + + if (match) + break; + + if (len < 0) { + DEBUG(2, ("expect: %s\n", strerror(errno))); + return False; + } + } + + DEBUG(10,("expect: returning %s\n", match ? "True" : "False" )); + return match; } 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"); + all_string_sub(buf, "\\n", "\n", 0); + all_string_sub(buf, "\\r", "\r", 0); + all_string_sub(buf, "\\s", " ", 0); + all_string_sub(buf, "\\t", "\t", 0); +} + +static int talktochild(int master, char *seq) +{ + int count = 0; + fstring issue, expected; + + fstrcpy(issue, "."); + + while (next_token(&seq, expected, NULL, sizeof(expected))) + { + pwd_sub(expected); + count++; + + if (!expect(master, issue, expected)) + { + DEBUG(3, ("Response %d incorrect\n", count)); + return False; + } + + if (!next_token(&seq, issue, NULL, sizeof(issue))) + fstrcpy(issue, "."); + + pwd_sub(issue); + } + if (!strequal(issue, ".")) { + /* we have one final issue to send */ + fstrcpy(expected, "."); + if (!expect(master, issue, expected)) + return False; + } + + return (count > 0); } -static void writestring(int fd,char *s) +static BOOL chat_with_program(char *passwordprogram, struct passwd *pass, + char *chatsequence, BOOL as_root) { - int l; - - l = strlen (s); - write (fd, s, l); + char *slavedev; + int master; + pid_t pid, wpid; + int wstat; + BOOL chstat = False; + + if (pass == NULL) + { + DEBUG(0, + ("chat_with_program: user doesn't exist in the UNIX password database.\n")); + return False; + } + + /* allocate a pseudo-terminal device */ + if ((master = findpty(&slavedev)) < 0) + { + DEBUG(3, + ("Cannot Allocate pty for password change: %s\n", + pass->pw_name)); + return (False); + } + + /* + * We need to temporarily stop CatchChild from eating + * SIGCLD signals as it also eats the exit status code. JRA. + */ + + CatchChildLeaveStatus(); + + if ((pid = sys_fork()) < 0) + { + DEBUG(3, + ("Cannot fork() child for password change: %s\n", + pass->pw_name)); + close(master); + CatchChild(); + 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", + pass->pw_name)); + kill(pid, SIGKILL); /* be sure to end this process */ + } + + while ((wpid = sys_waitpid(pid, &wstat, 0)) < 0) + { + if (errno == EINTR) + { + errno = 0; + continue; + } + break; + } + + if (wpid < 0) + { + DEBUG(3, ("The process is no longer waiting!\n\n")); + close(master); + CatchChild(); + return (False); + } + + /* + * Go back to ignoring children. + */ + CatchChild(); + + close(master); + + 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 */ + + /* + * Lose any oplock capabilities. + */ + oplock_set_capability(False, False); + + /* make sure it doesn't freeze */ + alarm(20); + + if (as_root) + become_root(); + + DEBUG(3, + ("Dochild for user %s (uid=%d,gid=%d)\n", pass->pw_name, + (int)getuid(), (int)getgid())); + chstat = + dochild(master, slavedev, pass, passwordprogram, + as_root); + + if (as_root) + unbecome_root(); + + /* + * The child should never return from dochild() .... + */ + + DEBUG(0, + ("chat_with_program: Error: dochild() returned %d\n", + chstat)); + exit(1); + } + + if (chstat) + DEBUG(3, + ("Password change %ssuccessful for user %s\n", + (chstat ? "" : "un"), pass->pw_name)); + return (chstat); } -static int talktochild(int master, char *chatsequence) +BOOL chgpasswd(const char *name, const char *oldpass, const char *newpass, BOOL as_root) { - char buf[BUFSIZE]; - int count=0; - char *ptr=chatsequence; - fstring chatbuf; + pstring passwordprogram; + pstring chatsequence; + size_t i; + size_t len; - *buf = 0; - sleep(1); + struct passwd *pass; - while (next_token(&ptr,chatbuf,NULL)) { - BOOL ok=True; - count++; - pwd_sub(chatbuf); - if (!strequal(chatbuf,".")) - ok = expect(master,chatbuf,buf); + DEBUG(3, ("Password change for user: %s\n", name)); #if DEBUG_PASSWORD - DEBUG(100,("chatbuf=[%s] responsebuf=[%s]\n",chatbuf,buf)); -#endif - - if (!ok) { - DEBUG(3,("response %d incorrect\n",count)); - return(False); - } + DEBUG(100, ("Passwords: old=%s new=%s\n", oldpass, newpass)); +#endif - if (!next_token(&ptr,chatbuf,NULL)) break; - pwd_sub(chatbuf); - if (!strequal(chatbuf,".")) - writestring(master,chatbuf); + /* Take the passed information and test it for minimum criteria */ + /* Minimum password length */ + if (strlen(newpass) < lp_min_passwd_length()) { + /* too short, must be at least MINPASSWDLENGTH */ + DEBUG(0, ("Password Change: user %s, New password is shorter than minimum password length = %d\n", + name, lp_min_passwd_length())); + 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 */ + } + + /* + * Check the old and new passwords don't contain any control + * characters. + */ + + len = strlen(oldpass); + for (i = 0; i < len; i++) { + if (iscntrl((int)oldpass[i])) { + DEBUG(0, + ("chat_with_program: oldpass contains control characters (disallowed).\n")); + return False; + } + } + + len = strlen(newpass); + for (i = 0; i < len; i++) { + if (iscntrl((int)newpass[i])) { + DEBUG(0, + ("chat_with_program: newpass contains control characters (disallowed).\n")); + return False; + } + } + + pass = Get_Pwnam(name); + +#ifdef WITH_PAM + if (lp_pam_password_change()) { + BOOL ret; + + if (as_root) + become_root(); + + if (pass) { + ret = smb_pam_passchange(pass->pw_name, oldpass, newpass); + } else { + ret = smb_pam_passchange(name, oldpass, newpass); + } + + if (as_root) + unbecome_root(); + + return ret; + } +#endif -#if DEBUG_PASSWORD - DEBUG(100,("sendbuf=[%s]\n",chatbuf)); -#endif - } + /* A non-PAM password change just doen't make sense without a valid local user */ + + if (pass == NULL) + { + DEBUG(0, + ("chgpasswd: user %s doesn't exist in the UNIX password database.\n", + name)); + return False; + } + + pstrcpy(passwordprogram, lp_passwd_program()); + pstrcpy(chatsequence, lp_passwd_chat()); + + if (!*chatsequence) { + DEBUG(2, ("chgpasswd: Null chat sequence - no password changing\n")); + return (False); + } + + if (!*passwordprogram) { + DEBUG(2, ("chgpasswd: Null password program - no password changing\n")); + return (False); + } + + if (as_root) { + /* The password program *must* contain the user name to work. Fail if not. */ + if (strstr(passwordprogram, "%u") == NULL) { + DEBUG(0,("chgpasswd: Running as root the 'passwd program' parameter *MUST* contain \ +the string %%u, and the given string %s does not.\n", passwordprogram )); + return False; + } + } + + pstring_sub(passwordprogram, "%u", name); + /* note that we do NOT substitute the %o and %n in the password program + as this would open up a security hole where the user could use + a new password containing shell escape characters */ + + pstring_sub(chatsequence, "%u", name); + all_string_sub(chatsequence, "%o", oldpass, sizeof(pstring)); + all_string_sub(chatsequence, "%n", newpass, sizeof(pstring)); + return (chat_with_program + (passwordprogram, pass, chatsequence, as_root)); +} - if (count<1) return(False); +#else /* ALLOW_CHANGE_PASSWORD */ - return (True); +BOOL chgpasswd(const char *name, const char *oldpass, const char *newpass, BOOL as_root) +{ + DEBUG(0, ("Password changing not compiled in (user=%s)\n", name)); + return (False); } +#endif /* ALLOW_CHANGE_PASSWORD */ +/*********************************************************** + Code to check the lanman hashed password. +************************************************************/ -BOOL chat_with_program(char *passwordprogram,char *name,char *chatsequence) +BOOL check_lanman_password(char *user, uchar * pass1, + uchar * pass2, SAM_ACCOUNT **hnd) { - 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 = 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); + uchar unenc_new_pw[16]; + uchar unenc_old_pw[16]; + SAM_ACCOUNT *sampass = NULL; + uint16 acct_ctrl; + const uint8 *lanman_pw; + BOOL ret; + + become_root(); + ret = pdb_getsampwnam(sampass, user); + unbecome_root(); + + if (ret == False) { + DEBUG(0,("check_lanman_password: getsampwnam returned NULL\n")); + pdb_free_sam(&sampass); + return False; + } + + acct_ctrl = pdb_get_acct_ctrl (sampass); + lanman_pw = pdb_get_lanman_passwd (sampass); + + if (acct_ctrl & ACB_DISABLED) { + DEBUG(0,("check_lanman_password: account %s disabled.\n", user)); + pdb_free_sam(&sampass); + return False; + } + + if (lanman_pw == NULL) { + if (acct_ctrl & ACB_PWNOTREQ) { + /* this saves the pointer for the caller */ + *hnd = sampass; + return True; + } else { + DEBUG(0, ("check_lanman_password: no lanman password !\n")); + pdb_free_sam(&sampass); + return False; + } + } + + /* Get the new lanman hash. */ + D_P16(lanman_pw, pass2, unenc_new_pw); + + /* Use this to get the old lanman hash. */ + D_P16(unenc_new_pw, pass1, unenc_old_pw); + + /* Check that the two old passwords match. */ + if (memcmp(lanman_pw, unenc_old_pw, 16)) { + DEBUG(0,("check_lanman_password: old password doesn't match.\n")); + pdb_free_sam(&sampass); + return False; + } + + /* this saves the pointer for the caller */ + *hnd = sampass; + return True; } +/*********************************************************** + Code to change the lanman hashed password. + It nulls out the NT hashed password as it will + no longer be valid. +************************************************************/ + +BOOL change_lanman_password(SAM_ACCOUNT *sampass, uchar * pass1, + uchar * pass2) +{ + static uchar null_pw[16]; + uchar unenc_new_pw[16]; + BOOL ret; + uint16 acct_ctrl; + const uint8 *pwd; + + if (sampass == NULL) { + DEBUG(0,("change_lanman_password: no smb password entry.\n")); + return False; + } + + acct_ctrl = pdb_get_acct_ctrl(sampass); + pwd = pdb_get_lanman_passwd(sampass); + + if (acct_ctrl & ACB_DISABLED) { + DEBUG(0,("change_lanman_password: account %s disabled.\n", + pdb_get_username(sampass))); + return False; + } + + if (pwd == NULL) { + if (acct_ctrl & ACB_PWNOTREQ) { + uchar no_pw[14]; + memset(no_pw, '\0', 14); + E_P16(no_pw, null_pw); + + /* Get the new lanman hash. */ + D_P16(null_pw, pass2, unenc_new_pw); + } else { + DEBUG(0,("change_lanman_password: no lanman password !\n")); + return False; + } + } else { + /* Get the new lanman hash. */ + D_P16(pwd, pass2, unenc_new_pw); + } + + if (!pdb_set_lanman_passwd(sampass, unenc_new_pw)) { + return False; + } + + if (!pdb_set_nt_passwd (sampass, NULL)) { + return False; /* We lose the NT hash. Sorry. */ + } + + if (!pdb_set_pass_changed_now (sampass)) { + pdb_free_sam(&sampass); + /* Not quite sure what this one qualifies as, but this will do */ + return False; + } + + /* Now flush the sam_passwd struct to persistent storage */ + become_root(); + ret = pdb_update_sam_account (sampass); + unbecome_root(); + + return ret; +} -BOOL chgpasswd(char *name,char *oldpass,char *newpass) +/*********************************************************** + Code to check and change the OEM hashed password. +************************************************************/ +BOOL pass_oem_change(char *user, + uchar * lmdata, uchar * lmhash, + uchar * ntdata, uchar * nthash) { - pstring passwordprogram; - pstring chatsequence; + fstring new_passwd; + const char *unix_user; + SAM_ACCOUNT *sampass = NULL; + BOOL ret = check_oem_password(user, lmdata, lmhash, ntdata, nthash, + &sampass, new_passwd, sizeof(new_passwd)); - strlower(name); - DEBUG(3,("Password change for user: %s\n",name)); + /* + * At this point we have the new case-sensitive plaintext + * password in the fstring new_passwd. If we wanted to synchronise + * with UNIX passwords we would call a UNIX password changing + * function here. However it would have to be done as root + * as the plaintext of the old users password is not + * available. JRA. + */ -#if DEBUG_PASSWORD - DEBUG(100,("Passwords: old=%s new=%s\n",oldpass,newpass)); -#endif + unix_user = pdb_get_username(sampass); - /* 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 ((ret) && (unix_user) && (*unix_user) && lp_unix_password_sync()) + ret = chgpasswd(unix_user, "", new_passwd, True); - if (!*chatsequence) { - DEBUG(2,("Null chat sequence - no password changing\n")); - return(False); - } + if (ret) + ret = change_oem_password(sampass, new_passwd); - if (!*passwordprogram) { - DEBUG(2,("Null password program - no password changing\n")); - return(False); - } + memset(new_passwd, 0, sizeof(new_passwd)); - string_sub(passwordprogram,"%u",name); - string_sub(passwordprogram,"%o",oldpass); - string_sub(passwordprogram,"%n",newpass); + pdb_free_sam(&sampass); - string_sub(chatsequence,"%u",name); - string_sub(chatsequence,"%o",oldpass); - string_sub(chatsequence,"%n",newpass); - return(chat_with_program(passwordprogram,name,chatsequence)); + return ret; } -#else -BOOL chgpasswd(char *name,char *oldpass,char *newpass) +/*********************************************************** + Code to check the OEM hashed password. + + this function ignores the 516 byte nt OEM hashed password + but does use the lm OEM password to check the nt hashed-hash. + +************************************************************/ +static BOOL check_oem_password(const char *user, + uchar * lmdata, const uchar * lmhash, + const uchar * ntdata, const uchar * nthash, + SAM_ACCOUNT **hnd, char *new_passwd, + int new_passwd_size) { - DEBUG(0,("Password changing not compiled in (user=%s)\n",name)); - return(False); -} + static uchar null_pw[16]; + static uchar null_ntpw[16]; + SAM_ACCOUNT *sampass = NULL; + const uint8 *lanman_pw, *nt_pw; + uint16 acct_ctrl; + int new_pw_len; + uchar new_ntp16[16]; + uchar unenc_old_ntpw[16]; + uchar new_p16[16]; + uchar unenc_old_pw[16]; + char no_pw[2]; + BOOL ret; + + BOOL nt_pass_set = (ntdata != NULL && nthash != NULL); + + pdb_init_sam(&sampass); + + become_root(); + ret = pdb_getsampwnam(sampass, user); + unbecome_root(); + + if (ret == False) { + DEBUG(0, ("check_oem_password: getsmbpwnam returned NULL\n")); + return False; + } + + *hnd = sampass; + + acct_ctrl = pdb_get_acct_ctrl(sampass); + + if (acct_ctrl & ACB_DISABLED) { + DEBUG(0,("check_lanman_password: account %s disabled.\n", user)); + return False; + } + + /* construct a null password (in case one is needed */ + no_pw[0] = 0; + no_pw[1] = 0; + nt_lm_owf_gen(no_pw, null_ntpw, null_pw); + + /* save pointers to passwords so we don't have to keep looking them up */ + lanman_pw = pdb_get_lanman_passwd(sampass); + nt_pw = pdb_get_nt_passwd (sampass); + + /* check for null passwords */ + if (lanman_pw == NULL) { + if (!(acct_ctrl & ACB_PWNOTREQ)) { + DEBUG(0,("check_oem_password: no lanman password !\n")); + return False; + } + } + + if (pdb_get_nt_passwd(sampass) == NULL && nt_pass_set) { + if (!(acct_ctrl & ACB_PWNOTREQ)) { + DEBUG(0,("check_oem_password: no ntlm password !\n")); + return False; + } + } + + /* + * Call the hash function to get the new password. + */ + SamOEMhash( lmdata, lanman_pw, 516); + + /* + * The length of the new password is in the last 4 bytes of + * the data buffer. + */ + + new_pw_len = IVAL(lmdata, 512); + if (new_pw_len < 0 || new_pw_len > new_passwd_size - 1) { + DEBUG(0,("check_oem_password: incorrect password length (%d).\n", new_pw_len)); + return False; + } + + if (nt_pass_set) { + /* + * nt passwords are in unicode + */ + pull_ucs2(NULL, new_passwd, + (const smb_ucs2_t *)&lmdata[512 - new_pw_len], + new_passwd_size, new_pw_len, 0); + } else { + memcpy(new_passwd, &lmdata[512 - new_pw_len], new_pw_len); + new_passwd[new_pw_len] = 0; + } + + /* + * To ensure we got the correct new password, hash it and + * use it as a key to test the passed old password. + */ + + nt_lm_owf_gen(new_passwd, new_ntp16, new_p16); + + if (!nt_pass_set) + { + /* + * Now use new_p16 as the key to see if the old + * password matches. + */ + D_P16(new_p16, lmhash, unenc_old_pw); + + if (memcmp(lanman_pw, unenc_old_pw, 16)) + { + DEBUG(0,("check_oem_password: old lm password doesn't match.\n")); + return False; + } + +#ifdef DEBUG_PASSWORD + DEBUG(100, + ("check_oem_password: password %s ok\n", new_passwd)); +#endif + return True; + } + + /* + * Now use new_p16 as the key to see if the old + * password matches. + */ + D_P16(new_ntp16, lmhash, unenc_old_pw); + D_P16(new_ntp16, nthash, unenc_old_ntpw); + + if (memcmp(lanman_pw, unenc_old_pw, 16)) + { + DEBUG(0,("check_oem_password: old lm password doesn't match.\n")); + return False; + } + + if (memcmp(nt_pw, unenc_old_ntpw, 16)) + { + DEBUG(0,("check_oem_password: old nt password doesn't match.\n")); + return False; + } +#ifdef DEBUG_PASSWORD + DEBUG(100, ("check_oem_password: password %s ok\n", new_passwd)); #endif + return True; +} + +/*********************************************************** + Code to change the oem password. Changes both the lanman + and NT hashes. +************************************************************/ + +BOOL change_oem_password(SAM_ACCOUNT *hnd, char *new_passwd) +{ + BOOL ret; + + if (!pdb_set_plaintext_passwd (hnd, new_passwd)) { + return False; + } + + /* Now write it into the file. */ + become_root(); + ret = pdb_update_sam_account (hnd); + unbecome_root(); + + return ret; +} + + + |