utils/smbpasswd.c

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/*
 * Unix SMB/CIFS implementation. 
 * Copyright (C) Jeremy Allison 1995-1998
 * Copyright (C) Tim Potter     2001
 * 
 * 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.  */

#include "includes.h"

extern BOOL AllowDebugChange;

/*
 * Next two lines needed for SunOS and don't
 * hurt anything else...
 */
extern char *optarg;
extern int optind;

/* forced running in root-mode */
static BOOL got_username = False;
static BOOL stdin_passwd_get = False;
static fstring user_name;
static char *new_passwd = NULL;
static const char *remote_machine = NULL;

static fstring ldap_secret;


/*********************************************************
 Print command usage on stderr and die.
**********************************************************/
static void usage(void)
{
        printf("When run by root:\n");
        printf("    smbpasswd [options] [username]\n");
        printf("otherwise:\n");
        printf("    smbpasswd [options]\n\n");

        printf("options:\n");
        printf("  -L                   local mode (must be first option)\n");
        printf("  -h                   print this usage message\n");
        printf("  -s                   use stdin for password prompt\n");
        printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
        printf("  -D LEVEL             debug level\n");
        printf("  -r MACHINE           remote machine\n");
        printf("  -U USER              remote username\n");

        printf("extra options when run by root or in local mode:\n");
        printf("  -a                   add user\n");
        printf("  -d                   disable user\n");
        printf("  -e                   enable user\n");
        printf("  -i                   interdomain trust account\n");
        printf("  -m                   machine trust account\n");
        printf("  -n                   set no password\n");
        printf("  -W                   use stdin ldap admin password\n");
        printf("  -w PASSWORD          ldap admin password\n");
        printf("  -x                   delete user\n");
        printf("  -R ORDER             name resolve order\n");

        exit(1);
}

static void set_line_buffering(FILE *f)
{
        setvbuf(f, NULL, _IOLBF, 0);
}

/*******************************************************************
 Process command line options
 ******************************************************************/

static int process_options(int argc, char **argv, int local_flags)
{
        int ch;
        pstring configfile;
        pstrcpy(configfile, dyn_CONFIGFILE);

        local_flags |= LOCAL_SET_PASSWORD;

        ZERO_STRUCT(user_name);

        user_name[0] = '\0';

        while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LW")) != EOF) {
                switch(ch) {
                case 'L':
#if !defined(DEVELOPER)
                        if (getuid() != 0) {
                                fprintf(stderr, "smbpasswd -L can only be used by root.\n");
                                exit(1);
                        }
#endif
                        local_flags |= LOCAL_AM_ROOT;
                        break;
                case 'c':
                        pstrcpy(configfile,optarg);
                        break;
                case 'a':
                        local_flags |= LOCAL_ADD_USER;
                        break;
                case 'x':
                        local_flags |= LOCAL_DELETE_USER;
                        local_flags &= ~LOCAL_SET_PASSWORD;
                        break;
                case 'd':
                        local_flags |= LOCAL_DISABLE_USER;
                        local_flags &= ~LOCAL_SET_PASSWORD;
                        break;
                case 'e':
                        local_flags |= LOCAL_ENABLE_USER;
                        local_flags &= ~LOCAL_SET_PASSWORD;
                        break;
                case 'm':
                        local_flags |= LOCAL_TRUST_ACCOUNT;
                        break;
                case 'i':
                        local_flags |= LOCAL_INTERDOM_ACCOUNT;
                        break;
                case 'j':
                        d_printf("See 'net join' for this functionality\n");
                        exit(1);
                        break;
                case 'n':
                        local_flags |= LOCAL_SET_NO_PASSWORD;
                        local_flags &= ~LOCAL_SET_PASSWORD;
                        new_passwd = smb_xstrdup("NO PASSWORD");
                        break;
                case 'r':
                        remote_machine = optarg;
                        break;
                case 's':
                        set_line_buffering(stdin);
                        set_line_buffering(stdout);
                        set_line_buffering(stderr);
                        stdin_passwd_get = True;
                        break;
                case 'w':
                        local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
                        fstrcpy(ldap_secret, optarg);
                        break;
                case 'R':
                        lp_set_name_resolve_order(optarg);
                        break;
                case 'D':
                        DEBUGLEVEL = atoi(optarg);
                        break;
                case 'U': {
                        got_username = True;
                        fstrcpy(user_name, optarg);
                        break;
                case 'W':
                        local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
                        *ldap_secret = '\0';
                        break;
                }
                case 'h':
                default:
                        usage();
                }
        }
        
        argc -= optind;
        argv += optind;

        switch(argc) {
        case 0:
                if (!got_username)
                        fstrcpy(user_name, "");
                break;
        case 1:
                if (!(local_flags & LOCAL_AM_ROOT)) {
                        usage();
                } else {
                        if (got_username) {
                                usage();
                        } else {
                                fstrcpy(user_name, argv[0]);
                        }
                }
                break;
        default:
                usage();
        }

        if (!lp_load(configfile,True,False,False,True)) {
                fprintf(stderr, "Can't load %s - run testparm to debug it\n", 
                        configfile);
                exit(1);
        }

        return local_flags;
}

/*************************************************************
 Utility function to prompt for new password.
*************************************************************/
static char *prompt_for_new_password(BOOL stdin_get)
{
        char *p;
        fstring new_pw;

        ZERO_ARRAY(new_pw);
 
        p = get_pass("New SMB password:", stdin_get);

        fstrcpy(new_pw, p);
        SAFE_FREE(p);

        p = get_pass("Retype new SMB password:", stdin_get);

        if (strcmp(p, new_pw)) {
                fprintf(stderr, "Mismatch - password unchanged.\n");
                ZERO_ARRAY(new_pw);
                SAFE_FREE(p);
                return NULL;
        }

        return p;
}


/*************************************************************
 Change a password either locally or remotely.
*************************************************************/

static NTSTATUS password_change(const char *remote_mach, char *username, 
                                char *old_passwd, char *new_pw,
                                int local_flags)
{
        NTSTATUS ret;
        pstring err_str;
        pstring msg_str;

        if (remote_mach != NULL) {
                if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
                                                        LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
                        /* these things can't be done remotely yet */
                        return NT_STATUS_UNSUCCESSFUL;
                }
                ret = remote_password_change(remote_mach, username, 
                                             old_passwd, new_pw, err_str, sizeof(err_str));
                if(*err_str)
                        fprintf(stderr, "%s", err_str);
                return ret;
        }
        
        ret = local_password_change(username, local_flags, new_pw, 
                                     err_str, sizeof(err_str), msg_str, sizeof(msg_str));

        if(*msg_str)
                printf("%s", msg_str);
        if(*err_str)
                fprintf(stderr, "%s", err_str);

        return ret;
}

/*******************************************************************
 Store the LDAP admin password in secrets.tdb
 ******************************************************************/
static BOOL store_ldap_admin_pw (char* pw)
{       
        if (!pw) 
                return False;

        if (!secrets_init())
                return False;
        
        return secrets_store_ldap_pw(lp_ldap_admin_dn(), pw);
}


/*************************************************************
 Handle password changing for root.
*************************************************************/

static int process_root(int local_flags)
{
        struct passwd  *pwd;
        int result = 0;
        char *old_passwd = NULL;

        if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
                char *ldap_admin_dn = lp_ldap_admin_dn();
                if ( ! *ldap_admin_dn ) {
                        DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
                        goto done;
                }

                printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
                if ( ! *ldap_secret ) {
                        new_passwd = prompt_for_new_password(stdin_passwd_get);
                        fstrcpy(ldap_secret, new_passwd);
                }
                if (!store_ldap_admin_pw(ldap_secret)) {
                        DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
                }
                goto done;
        }

        /* Ensure passdb startup(). */
        if(!initialize_password_db(False)) {
                DEBUG(0, ("Failed to open passdb!\n"));
                exit(1);
        }
                
        /* Ensure we have a SAM sid. */
        get_global_sam_sid();

        /*
         * Ensure both add/delete user are not set
         * Ensure add/delete user and either remote machine or join domain are
         * not both set.
         */     
        if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) || 
           ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) && 
                (remote_machine != NULL))) {
                usage();
        }
        
        /* Only load interfaces if we are doing network operations. */

        if (remote_machine) {
                load_interfaces();
        }

        if (!user_name[0] && (pwd = getpwuid_alloc(NULL, geteuid()))) {
                fstrcpy(user_name, pwd->pw_name);
                TALLOC_FREE(pwd);
        } 

        if (!user_name[0]) {
                fprintf(stderr,"You must specify a username\n");
                exit(1);
        }

        if (local_flags & LOCAL_TRUST_ACCOUNT) {
                /* add the $ automatically */
                static fstring buf;

                /*
                 * Remove any trailing '$' before we
                 * generate the initial machine password.
                 */

                if (user_name[strlen(user_name)-1] == '$') {
                        user_name[strlen(user_name)-1] = 0;
                }

                if (local_flags & LOCAL_ADD_USER) {
                        SAFE_FREE(new_passwd);
                        new_passwd = smb_xstrdup(user_name);
                        strlower_m(new_passwd);
                }

                /*
                 * Now ensure the username ends in '$' for
                 * the machine add.
                 */

                slprintf(buf, sizeof(buf)-1, "%s$", user_name);
                fstrcpy(user_name, buf);
        } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
                static fstring buf;

                if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
                        /*
                         * Prompt for trusting domain's account password
                         */
                        new_passwd = prompt_for_new_password(stdin_passwd_get);
                        if(!new_passwd) {
                                fprintf(stderr, "Unable to get newpassword.\n");
                                exit(1);
                        }
                }
                
                /* prepare uppercased and '$' terminated username */
                slprintf(buf, sizeof(buf) - 1, "%s$", user_name);
                fstrcpy(user_name, buf);
                
        } else {
                
                if (remote_machine != NULL) {
                        old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
                }
                
                if (!(local_flags & LOCAL_SET_PASSWORD)) {
                        
                        /*
                         * If we are trying to enable a user, first we need to find out
                         * if they are using a modern version of the smbpasswd file that
                         * disables a user by just writing a flag into the file. If so
                         * then we can re-enable a user without prompting for a new
                         * password. If not (ie. they have a no stored password in the
                         * smbpasswd file) then we need to prompt for a new password.
                         */
                        
                        if(local_flags & LOCAL_ENABLE_USER) {
                                struct samu *sampass = NULL;
                                
                                sampass = samu_new( NULL );
                                if (!sampass) {
                                        fprintf(stderr, "talloc fail for struct samu.\n");
                                        exit(1);
                                }
                                if (!pdb_getsampwnam(sampass, user_name)) {
                                        fprintf(stderr, "Failed to find user %s in passdb backend.\n",
                                                user_name );
                                        exit(1);
                                }

                                if(pdb_get_nt_passwd(sampass) == NULL) {
                                        local_flags |= LOCAL_SET_PASSWORD;
                                }
                                TALLOC_FREE(sampass);
                        }
                }
                
                if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
                        new_passwd = prompt_for_new_password(stdin_passwd_get);
                        
                        if(!new_passwd) {
                                fprintf(stderr, "Unable to get new password.\n");
                                exit(1);
                        }
                }
        }

        if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name,
                                             old_passwd, new_passwd,
                                             local_flags))) {
                fprintf(stderr,"Failed to modify password entry for user %s\n", user_name);
                result = 1;
                goto done;
        } 

        if(remote_machine) {
                printf("Password changed for user %s on %s.\n", user_name, remote_machine );
        } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
                struct samu *sampass = NULL;
                
                sampass = samu_new( NULL );
                if (!sampass) {
                        fprintf(stderr, "talloc fail for struct samu.\n");
                        exit(1);
                }

                if (!pdb_getsampwnam(sampass, user_name)) {
                        fprintf(stderr, "Failed to find user %s in passdb backend.\n",
                                user_name );
                        exit(1);
                }

                printf("Password changed for user %s.", user_name );
                if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
                        printf(" User has disabled flag set.");
                }
                if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
                        printf(" User has no password flag set.");
                }
                printf("\n");
                TALLOC_FREE(sampass);
        }

 done:
        SAFE_FREE(new_passwd);
        return result;
}


/*************************************************************
 Handle password changing for non-root.
*************************************************************/

static int process_nonroot(int local_flags)
{
        struct passwd  *pwd = NULL;
        int result = 0;
        char *old_pw = NULL;
        char *new_pw = NULL;

        if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
                /* Extra flags that we can't honor non-root */
                usage();
        }

        if (!user_name[0]) {
                pwd = getpwuid_alloc(NULL, getuid());
                if (pwd) {
                        fstrcpy(user_name,pwd->pw_name);
                        TALLOC_FREE(pwd);
                } else {
                        fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
                        exit(1);
                }
        }
        
        /*
         * A non-root user is always setting a password
         * via a remote machine (even if that machine is
         * localhost).
         */     

        load_interfaces(); /* Delayed from main() */

        if (remote_machine == NULL) {
                remote_machine = "127.0.0.1";
        }

        if (remote_machine != NULL) {
                old_pw = get_pass("Old SMB password:",stdin_passwd_get);
        }
        
        if (!new_passwd) {
                new_pw = prompt_for_new_password(stdin_passwd_get);
        }
        else
                new_pw = smb_xstrdup(new_passwd);
        
        if (!new_pw) {
                fprintf(stderr, "Unable to get new password.\n");
                exit(1);
        }

        if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name, old_pw,
                                             new_pw, 0))) {
                fprintf(stderr,"Failed to change password for %s\n", user_name);
                result = 1;
                goto done;
        }

        printf("Password changed for user %s\n", user_name);

 done:
        SAFE_FREE(old_pw);
        SAFE_FREE(new_pw);

        return result;
}



/*********************************************************
 Start here.
**********************************************************/
int main(int argc, char **argv)
{       
        int local_flags = 0;
        
        AllowDebugChange = False;

#if defined(HAVE_SET_AUTH_PARAMETERS)
        set_auth_parameters(argc, argv);
#endif /* HAVE_SET_AUTH_PARAMETERS */

        if (getuid() == 0) {
                local_flags = LOCAL_AM_ROOT;
        }

        load_case_tables();

        local_flags = process_options(argc, argv, local_flags);

        setup_logging("smbpasswd", True);
        
        /*
         * Set the machine NETBIOS name if not already
         * set from the config file. 
         */ 
    
        if (!init_names())
                return 1;

        /* Check the effective uid - make sure we are not setuid */
        if (is_setuid_root()) {
                fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
                exit(1);
        }

        if (local_flags & LOCAL_AM_ROOT) {
                secrets_init();
                return process_root(local_flags);
        } 

        return process_nonroot(local_flags);
}

---