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shadow/src/usermod.c

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/*
* Copyright 1991 - 1994, Julianne Frances Haugh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#ident "$Id$"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <lastlog.h>
#include <pwd.h>
#ifdef USE_PAM
#include "pam_defs.h"
#endif /* USE_PAM */
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include "chkname.h"
#include "defines.h"
#include "faillog.h"
#include "getdef.h"
#include "groupio.h"
#include "nscd.h"
#include "prototypes.h"
#include "pwauth.h"
#include "pwio.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
#endif
#include "shadowio.h"
/*
* exit status values
* for E_GRP_UPDATE and E_NOSPACE (not used yet), other update requests
* will be implemented (as documented in the Solaris 2.x man page).
*/
#define E_SUCCESS 0 /* success */
#define E_PW_UPDATE 1 /* can't update password file */
#define E_USAGE 2 /* invalid command syntax */
#define E_BAD_ARG 3 /* invalid argument to option */
#define E_UID_IN_USE 4 /* UID already in use (and no -o) */
/* #define E_BAD_PWFILE 5 passwd file contains errors */
#define E_NOTFOUND 6 /* specified user/group doesn't exist */
#define E_USER_BUSY 8 /* user to modify is logged in */
#define E_NAME_IN_USE 9 /* username already in use */
#define E_GRP_UPDATE 10 /* can't update group file */
/* #define E_NOSPACE 11 insufficient space to move home dir */
#define E_HOMEDIR 12 /* unable to complete home dir move */
#define VALID(s) (strcspn (s, ":\n") == strlen (s))
/*
* Global variables
*/
static char *user_name;
static char *user_newname;
static char *user_pass;
static uid_t user_id;
static uid_t user_newid;
static gid_t user_gid;
static gid_t user_newgid;
static char *user_comment;
static char *user_home;
static char *user_newhome;
static char *user_shell;
static long user_expire;
static long user_inactive;
static long sys_ngroups;
static char **user_groups; /* NULL-terminated list */
#ifdef WITH_AUDIT
static char *user_newcomment; /* Audit */
static char *user_newshell; /* Audit */
static long user_newexpire; /* Audit */
static long user_newinactive; /* Audit */
#endif
static char *Prog;
static int
aflg = 0, /* append to existing secondary group set */
cflg = 0, /* new comment (GECOS) field */
dflg = 0, /* new home directory */
eflg = 0, /* days since 1970-01-01 when account becomes expired */
fflg = 0, /* days until account with expired password is locked */
gflg = 0, /* new primary group ID */
Gflg = 0, /* new secondary group set */
Lflg = 0, /* lock the password */
lflg = 0, /* new user name */
mflg = 0, /* create user's home directory if it doesn't exist */
oflg = 0, /* permit non-unique user ID to be specified with -u */
pflg = 0, /* new encrypted password */
sflg = 0, /* new shell program */
uflg = 0, /* specify new user ID */
Uflg = 0; /* unlock the password */
static int is_shadow_pwd;
#ifdef SHADOWGRP
static int is_shadow_grp;
#endif
/* local function prototypes */
static int get_groups (char *);
static void usage (void);
static void new_pwent (struct passwd *);
static void new_spent (struct spwd *);
static void fail_exit (int);
static int update_group (void);
#ifdef SHADOWGRP
static int update_gshadow (void);
#endif
static int grp_update (void);
static long get_number (const char *);
static uid_t get_id (const char *);
static void process_flags (int, char **);
static void close_files (void);
static void open_files (void);
static void usr_update (void);
static void move_home (void);
static void update_files (void);
#ifndef NO_MOVE_MAILBOX
static void move_mailbox (void);
#endif
/*
* Had to move this over from useradd.c since we have groups named
* "56k-family"... ergh.
* --Pac.
*/
static struct group *getgr_nam_gid (const char *grname)
{
long val;
char *errptr;
val = strtol (grname, &errptr, 10);
if (*grname != '\0' && *errptr == '\0' && errno != ERANGE && val >= 0)
return getgrgid (val);
return getgrnam (grname);
}
/*
* get_groups - convert a list of group names to an array of group IDs
*
* get_groups() takes a comma-separated list of group names and
* converts it to a NULL-terminated array. Any unknown group names are
* reported as errors.
*/
static int get_groups (char *list)
{
char *cp;
const struct group *grp;
int errors = 0;
int ngroups = 0;
/*
* Initialize the list to be empty
*/
user_groups[0] = (char *) 0;
if (!*list)
return 0;
/*
* So long as there is some data to be converted, strip off each
* name and look it up. A mix of numerical and string values for
* group identifiers is permitted.
*/
do {
/*
* Strip off a single name from the list
*/
if ((cp = strchr (list, ',')))
*cp++ = '\0';
/*
* Names starting with digits are treated as numerical GID
* values, otherwise the string is looked up as is.
*/
grp = getgr_nam_gid (list);
/*
* There must be a match, either by GID value or by
* string name.
*/
if (!grp) {
fprintf (stderr, _("%s: unknown group %s\n"),
Prog, list);
errors++;
}
list = cp;
/*
* If the group doesn't exist, don't dump core. Instead,
* try the next one. --marekm
*/
if (!grp)
continue;
#ifdef USE_NIS
/*
* Don't add this group if they are an NIS group. Tell the
* user to go to the server for this group.
*/
if (__isgrNIS ()) {
fprintf (stderr,
_("%s: group '%s' is a NIS group.\n"),
Prog, grp->gr_name);
continue;
}
#endif
if (ngroups == sys_ngroups) {
fprintf (stderr,
_
("%s: too many groups specified (max %d).\n"),
Prog, ngroups);
break;
}
/*
* Add the group name to the user's list of groups.
*/
user_groups[ngroups++] = xstrdup (grp->gr_name);
} while (list);
user_groups[ngroups] = (char *) 0;
/*
* Any errors in finding group names are fatal
*/
if (errors)
return -1;
return 0;
}
/*
* usage - display usage message and exit
*/
static void usage (void)
{
fprintf (stderr, _("Usage: usermod [options] LOGIN\n"
"\n"
"Options:\n"
" -c, --comment COMMENT new value of the GECOS field\n"
" -d, --home HOME_DIR new home directory for the user account\n"
" -e, --expiredate EXPIRE_DATE set account expiration date to EXPIRE_DATE\n"
" -f, --inactive INACTIVE set password inactive after expiration\n"
" to INACTIVE\n"
" -g, --gid GROUP force use GROUP as new primary group\n"
" -G, --groups GROUPS new list of supplementary GROUPS\n"
" -a, --append append the user to the supplemental GROUPS\n"
" mentioned by the -G option without removing\n"
" him/her from other groups\n"
" -h, --help display this help message and exit\n"
" -l, --login NEW_LOGIN new value of the login name\n"
" -L, --lock lock the user account\n"
" -m, --move-home move contents of the home directory to the new\n"
" location (use only with -d)\n"
" -o, --non-unique allow using duplicate (non-unique) UID\n"
" -p, --password PASSWORD use encrypted password for the new password\n"
" -s, --shell SHELL new login shell for the user account\n"
" -u, --uid UID new UID for the user account\n"
" -U, --unlock unlock the user account\n"
"\n"));
exit (E_USAGE);
}
/*
* update encrypted password string (for both shadow and non-shadow
* passwords)
*/
static char *new_pw_passwd (char *pw_pass, const char *pw_name)
{
if (Lflg && pw_pass[0] != '!') {
char *buf = xmalloc (strlen (pw_pass) + 2);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "updating passwd",
user_newname, user_newid, 0);
#endif
SYSLOG ((LOG_INFO, "lock user `%s' password", pw_name));
strcpy (buf, "!");
strcat (buf, pw_pass);
pw_pass = buf;
} else if (Uflg && pw_pass[0] == '!') {
char *s;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "updating password",
user_newname, user_newid, 0);
#endif
SYSLOG ((LOG_INFO, "unlock user `%s' password", pw_name));
s = pw_pass;
while (*s) {
*s = *(s + 1);
s++;
}
} else if (pflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "changing password",
user_newname, user_newid, 1);
#endif
SYSLOG ((LOG_INFO, "change user `%s' password", pw_name));
pw_pass = xstrdup (user_pass);
}
return pw_pass;
}
/*
* new_pwent - initialize the values in a password file entry
*
* new_pwent() takes all of the values that have been entered and fills
* in a (struct passwd) with them.
*/
static void new_pwent (struct passwd *pwent)
{
if (lflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "changing name",
user_newname, user_newid, 1);
#endif
SYSLOG ((LOG_INFO, "change user name `%s' to `%s'",
pwent->pw_name, user_newname));
pwent->pw_name = xstrdup (user_newname);
}
if (!is_shadow_pwd)
pwent->pw_passwd =
new_pw_passwd (pwent->pw_passwd, pwent->pw_name);
if (uflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "changing uid",
user_newname, user_newid, 1);
#endif
SYSLOG ((LOG_INFO,
"change user `%s' UID from `%d' to `%d'",
pwent->pw_name, pwent->pw_uid, user_newid));
pwent->pw_uid = user_newid;
}
if (gflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing primary group", user_newname,
user_newid, 1);
#endif
SYSLOG ((LOG_INFO,
"change user `%s' GID from `%d' to `%d'",
pwent->pw_name, pwent->pw_gid, user_newgid));
pwent->pw_gid = user_newgid;
}
if (cflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "changing comment",
user_newname, user_newid, 1);
pwent->pw_gecos = user_newcomment;
#else
pwent->pw_gecos = user_comment;
#endif
}
if (dflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing home directory", user_newname,
user_newid, 1);
#endif
SYSLOG ((LOG_INFO,
"change user `%s' home from `%s' to `%s'",
pwent->pw_name, pwent->pw_dir, user_newhome));
pwent->pw_dir = user_newhome;
}
if (sflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "changing user shell",
user_newname, user_newid, 1);
SYSLOG ((LOG_INFO, "change user `%s' shell from `%s' to `%s'",
pwent->pw_name, pwent->pw_shell, user_newshell));
pwent->pw_shell = user_newshell;
#else
SYSLOG ((LOG_INFO,
"change user `%s' shell from `%s' to `%s'",
pwent->pw_name, pwent->pw_shell, user_shell));
pwent->pw_shell = user_shell;
#endif
}
}
/*
* new_spent - initialize the values in a shadow password file entry
*
* new_spent() takes all of the values that have been entered and fills
* in a (struct spwd) with them.
*/
static void new_spent (struct spwd *spent)
{
if (lflg)
spent->sp_namp = xstrdup (user_newname);
if (fflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing inactive days", user_newname,
user_newid, 1);
SYSLOG ((LOG_INFO,
"change user `%s' inactive from `%ld' to `%ld'",
spent->sp_namp, spent->sp_inact, user_newinactive));
spent->sp_inact = user_newinactive;
#else
SYSLOG ((LOG_INFO,
"change user `%s' inactive from `%ld' to `%ld'",
spent->sp_namp, spent->sp_inact, user_inactive));
spent->sp_inact = user_inactive;
#endif
}
if (eflg) {
/* XXX - dates might be better than numbers of days. --marekm */
#ifdef WITH_AUDIT
if (audit_fd >= 0) {
time_t exp_t;
struct tm *exp_tm;
char new_exp[16], old_exp[16];
if (user_newexpire == -1)
new_exp[0] = '\0';
else {
exp_t = user_newexpire * DAY;
exp_tm = gmtime (&exp_t);
#ifdef HAVE_STRFTIME
strftime (new_exp, sizeof (new_exp), "%Y-%m-%d",
exp_tm);
#else
memset (new_exp, 0, sizeof (new_exp));
snprintf (new_exp, sizeof (new_exp) - 1,
"%04i-%02i-%02i",
exp_tm->tm_year + 1900,
exp_tm->tm_mon + 1, exp_tm->tm_mday);
#endif
}
if (user_expire == -1)
old_exp[0] = '\0';
else {
exp_t = user_expire * DAY;
exp_tm = gmtime (&exp_t);
#ifdef HAVE_STRFTIME
strftime (old_exp, sizeof (old_exp), "%Y-%m-%d",
exp_tm);
#else
memset (old_exp, 0, sizeof (old_exp));
snprintf (old_exp, sizeof (old_exp) - 1,
"%04i-%02i-%02i",
exp_tm->tm_year + 1900,
exp_tm->tm_mon + 1, exp_tm->tm_mday);
#endif
}
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing expiration date", user_newname,
user_newid, 1);
}
SYSLOG ((LOG_INFO,
"change user `%s' expiration from `%ld' to `%ld'",
spent->sp_namp, spent->sp_expire, user_newexpire));
spent->sp_expire = user_newexpire;
#else
SYSLOG ((LOG_INFO,
"change user `%s' expiration from `%ld' to `%ld'",
spent->sp_namp, spent->sp_expire, user_expire));
spent->sp_expire = user_expire;
#endif
}
spent->sp_pwdp = new_pw_passwd (spent->sp_pwdp, spent->sp_namp);
if (pflg)
spent->sp_lstchg = time ((time_t *) 0) / SCALE;
}
/*
* fail_exit - exit with an error code after unlocking files
*/
static void fail_exit (int code)
{
(void) gr_unlock ();
#ifdef SHADOWGRP
if (is_shadow_grp)
sgr_unlock ();
#endif
if (is_shadow_pwd)
spw_unlock ();
(void) pw_unlock ();
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "modifying account",
user_name, -1, 0);
#endif
exit (code);
}
static int update_group (void)
{
int is_member;
int was_member;
int changed;
const struct group *grp;
struct group *ngrp;
/*
* Lock and open the group file. This will load all of the group
* entries.
*/
if (!gr_lock ()) {
fprintf (stderr, _("%s: error locking group file\n"), Prog);
SYSLOG ((LOG_ERR, "error locking group file"));
return -1;
}
if (!gr_open (O_RDWR)) {
fprintf (stderr, _("%s: error opening group file\n"), Prog);
SYSLOG ((LOG_ERR, "error opening group file"));
gr_unlock ();
return -1;
}
changed = 0;
/*
* Scan through the entire group file looking for the groups that
* the user is a member of.
*/
while ((grp = gr_next ())) {
/*
* See if the user specified this group as one of their
* concurrent groups.
*/
was_member = is_on_list (grp->gr_mem, user_name);
is_member = Gflg && is_on_list (user_groups, grp->gr_name);
if (!was_member && !is_member)
continue;
ngrp = __gr_dup (grp);
if (!ngrp) {
fprintf (stderr,
_("%s: out of memory in update_group\n"),
Prog);
gr_unlock ();
return -1;
}
if (was_member && (!Gflg || is_member)) {
if (lflg) {
ngrp->gr_mem = del_list (ngrp->gr_mem,
user_name);
ngrp->gr_mem = add_list (ngrp->gr_mem,
user_newname);
changed = 1;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing group member",
user_newname, -1, 1);
#endif
SYSLOG ((LOG_INFO,
"change `%s' to `%s' in group `%s'",
user_name, user_newname,
ngrp->gr_name));
}
} else if (was_member && !aflg && Gflg && !is_member) {
ngrp->gr_mem = del_list (ngrp->gr_mem, user_name);
changed = 1;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"removing group member", user_name, -1,
1);
#endif
SYSLOG ((LOG_INFO, "delete `%s' from group `%s'",
user_name, ngrp->gr_name));
} else if (!was_member && Gflg && is_member) {
ngrp->gr_mem = add_list (ngrp->gr_mem,
lflg ? user_newname :
user_name);
changed = 1;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"adding user to group", user_name, -1, 1);
#endif
SYSLOG ((LOG_INFO, "add `%s' to group `%s'",
lflg ? user_newname : user_name,
ngrp->gr_name));
}
if (!changed)
continue;
changed = 0;
if (!gr_update (ngrp)) {
fprintf (stderr,
_("%s: error adding new group entry\n"), Prog);
SYSLOG ((LOG_ERR, "error adding group entry"));
gr_unlock ();
return -1;
}
}
if (!gr_close ()) {
fprintf (stderr, _("%s: cannot rewrite group file\n"), Prog);
gr_unlock ();
return -1;
}
gr_unlock ();
return 0;
}
#ifdef SHADOWGRP
static int update_gshadow (void)
{
int is_member;
int was_member;
int was_admin;
int changed;
const struct sgrp *sgrp;
struct sgrp *nsgrp;
if (!sgr_lock ()) {
fprintf (stderr,
_("%s: error locking shadow group file\n"), Prog);
SYSLOG ((LOG_ERR, "error locking shadow group file"));
return -1;
}
if (!sgr_open (O_RDWR)) {
fprintf (stderr,
_("%s: error opening shadow group file\n"), Prog);
SYSLOG ((LOG_ERR, "error opening shadow group file"));
sgr_unlock ();
return -1;
}
changed = 0;
/*
* Scan through the entire shadow group file looking for the groups
* that the user is a member of.
*/
while ((sgrp = sgr_next ())) {
/*
* See if the user was a member of this group
*/
was_member = is_on_list (sgrp->sg_mem, user_name);
/*
* See if the user was an administrator of this group
*/
was_admin = is_on_list (sgrp->sg_adm, user_name);
/*
* See if the user specified this group as one of their
* concurrent groups.
*/
is_member = Gflg && is_on_list (user_groups, sgrp->sg_name);
if (!was_member && !was_admin && !is_member)
continue;
nsgrp = __sgr_dup (sgrp);
if (!nsgrp) {
fprintf (stderr,
_
("%s: out of memory in update_gshadow\n"),
Prog);
sgr_unlock ();
return -1;
}
if (was_admin && lflg) {
nsgrp->sg_adm = del_list (nsgrp->sg_adm, user_name);
nsgrp->sg_adm = add_list (nsgrp->sg_adm, user_newname);
changed = 1;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing admin name in shadow group",
user_name, -1, 1);
#endif
SYSLOG ((LOG_INFO,
"change admin `%s' to `%s' in shadow group `%s'",
user_name, user_newname, nsgrp->sg_name));
}
if (was_member && (!Gflg || is_member)) {
if (lflg) {
nsgrp->sg_mem = del_list (nsgrp->sg_mem,
user_name);
nsgrp->sg_mem = add_list (nsgrp->sg_mem,
user_newname);
changed = 1;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing member in shadow group",
user_name, -1, 1);
#endif
SYSLOG ((LOG_INFO,
"change `%s' to `%s' in shadow group `%s'",
user_name, user_newname,
nsgrp->sg_name));
}
} else if (was_member && !aflg && Gflg && !is_member) {
nsgrp->sg_mem = del_list (nsgrp->sg_mem, user_name);
changed = 1;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"removing user from shadow group",
user_name, -1, 1);
#endif
SYSLOG ((LOG_INFO,
"delete `%s' from shadow group `%s'",
user_name, nsgrp->sg_name));
} else if (!was_member && Gflg && is_member) {
nsgrp->sg_mem = add_list (nsgrp->sg_mem,
lflg ? user_newname :
user_name);
changed = 1;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"adding user to shadow group",
user_newname, -1, 1);
#endif
SYSLOG ((LOG_INFO, "add `%s' to shadow group `%s'",
lflg ? user_newname : user_name,
nsgrp->sg_name));
}
if (!changed)
continue;
changed = 0;
/*
* Update the group entry to reflect the changes.
*/
if (!sgr_update (nsgrp)) {
fprintf (stderr,
_("%s: error adding new group entry\n"), Prog);
SYSLOG ((LOG_ERR, "error adding shadow group entry"));
sgr_unlock ();
return -1;
}
}
if (!sgr_close ()) {
fprintf (stderr,
_("%s: cannot rewrite shadow group file\n"), Prog);
sgr_unlock ();
return -1;
}
sgr_unlock ();
return 0;
}
#endif /* SHADOWGRP */
/*
* grp_update - add user to secondary group set
*
* grp_update() takes the secondary group set given in user_groups and
* adds the user to each group given by that set.
*/
static int grp_update (void)
{
int ret;
ret = update_group ();
#ifdef SHADOWGRP
if (!ret && is_shadow_grp)
ret = update_gshadow ();
#endif
return ret;
}
static long get_number (const char *numstr)
{
long val;
char *errptr;
val = strtol (numstr, &errptr, 10);
if (*errptr || errno == ERANGE) {
fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog,
numstr);
exit (E_BAD_ARG);
}
return val;
}
static uid_t get_id (const char *uidstr)
{
long val;
char *errptr;
val = strtol (uidstr, &errptr, 10);
if (*errptr || errno == ERANGE || val < 0) {
fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog,
uidstr);
exit (E_BAD_ARG);
}
return val;
}
/*
* process_flags - perform command line argument setting
*
* process_flags() interprets the command line arguments and sets the
* values that the user will be created with accordingly. The values
* are checked for sanity.
*/
static void process_flags (int argc, char **argv)
{
const struct group *grp;
const struct passwd *pwd;
const struct spwd *spwd = NULL;
int anyflag = 0;
if (argc == 1 || argv[argc - 1][0] == '-')
usage ();
if (!(pwd = getpwnam (argv[argc - 1]))) {
fprintf (stderr, _("%s: user %s does not exist\n"),
Prog, argv[argc - 1]);
exit (E_NOTFOUND);
}
user_name = argv[argc - 1];
user_id = pwd->pw_uid;
user_gid = pwd->pw_gid;
user_comment = xstrdup (pwd->pw_gecos);
user_home = xstrdup (pwd->pw_dir);
user_shell = xstrdup (pwd->pw_shell);
#ifdef WITH_AUDIT
user_newname = user_name;
user_newid = user_id;
user_newgid = user_gid;
user_newcomment = user_comment;
user_newhome = user_home;
user_newshell = user_shell;
#endif
#ifdef USE_NIS
/*
* Now make sure it isn't an NIS user.
*/
if (__ispwNIS ()) {
char *nis_domain;
char *nis_master;
fprintf (stderr, _("%s: user %s is a NIS user\n"),
Prog, user_name);
if (!yp_get_default_domain (&nis_domain) &&
!yp_master (nis_domain, "passwd.byname", &nis_master)) {
fprintf (stderr, _("%s: %s is the NIS master\n"),
Prog, nis_master);
}
exit (E_NOTFOUND);
}
#endif
if (is_shadow_pwd && (spwd = getspnam (user_name))) {
user_expire = spwd->sp_expire;
user_inactive = spwd->sp_inact;
#ifdef WITH_AUDIT
user_newexpire = user_expire;
user_newinactive = user_inactive;
#endif
}
{
/*
* Parse the command line options.
*/
int c;
static struct option long_options[] = {
{"append", no_argument, NULL, 'a'},
{"comment", required_argument, NULL, 'c'},
{"home", required_argument, NULL, 'd'},
{"expiredate", required_argument, NULL, 'e'},
{"inactive", required_argument, NULL, 'f'},
{"gid", required_argument, NULL, 'g'},
{"groups", required_argument, NULL, 'G'},
{"help", no_argument, NULL, 'h'},
{"login", required_argument, NULL, 'l'},
{"lock", no_argument, NULL, 'L'},
{"move-home", no_argument, NULL, 'm'},
{"non-unique", no_argument, NULL, 'o'},
{"password", required_argument, NULL, 'p'},
{"shell", required_argument, NULL, 's'},
{"uid", required_argument, NULL, 'u'},
{"unlock", no_argument, NULL, 'U'},
{NULL, 0, NULL, '\0'}
};
while ((c =
getopt_long (argc, argv, "ac:d:e:f:g:G:hl:Lmop:s:u:U",
long_options, NULL)) != -1) {
switch (c) {
case 'a':
aflg++;
break;
case 'c':
if (!VALID (optarg)) {
fprintf (stderr,
_("%s: invalid field '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
#ifdef WITH_AUDIT
user_newcomment = optarg;
#else
user_comment = optarg;
#endif
cflg++;
break;
case 'd':
if (!VALID (optarg)) {
fprintf (stderr,
_("%s: invalid field '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
dflg++;
user_newhome = optarg;
break;
case 'e':
if (*optarg) {
#ifdef WITH_AUDIT
user_newexpire = strtoday (optarg);
if (user_newexpire == -1) {
#else
user_expire = strtoday (optarg);
if (user_expire == -1) {
#endif
fprintf (stderr,
_
("%s: invalid date '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
#ifdef WITH_AUDIT
user_newexpire *= DAY / SCALE;
#else
user_expire *= DAY / SCALE;
#endif
} else
#ifdef WITH_AUDIT
user_newexpire = -1;
#else
user_expire = -1;
#endif
eflg++;
break;
case 'f':
#ifdef WITH_AUDIT
user_newinactive = get_number (optarg);
#else
user_inactive = get_number (optarg);
#endif
fflg++;
break;
case 'g':
grp = getgr_nam_gid (optarg);
if (!grp) {
fprintf (stderr,
_("%s: unknown group %s\n"),
Prog, optarg);
exit (E_NOTFOUND);
}
user_newgid = grp->gr_gid;
gflg++;
break;
case 'G':
if (get_groups (optarg))
exit (E_NOTFOUND);
Gflg++;
break;
case 'l':
if (!check_user_name (optarg)) {
fprintf (stderr,
_("%s: invalid field '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
/*
* If the name does not really change, we mustn't
* set the flag as this will cause rather serious
* problems later!
*/
if (strcmp (user_name, optarg))
lflg++;
user_newname = optarg;
break;
case 'L':
if (Uflg || pflg)
usage ();
Lflg++;
break;
case 'm':
if (!dflg)
usage ();
mflg++;
break;
case 'o':
if (!uflg)
usage ();
oflg++;
break;
case 'p':
if (Lflg || Uflg)
usage ();
user_pass = optarg;
pflg++;
break;
case 's':
if (!VALID (optarg)) {
fprintf (stderr,
_("%s: invalid field '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
#ifdef WITH_AUDIT
user_newshell = optarg;
#else
user_shell = optarg;
#endif
sflg++;
break;
case 'u':
user_newid = get_id (optarg);
uflg++;
break;
case 'U':
if (Lflg && pflg)
usage ();
Uflg++;
break;
default:
usage ();
}
anyflag++;
}
}
if (anyflag == 0) {
fprintf (stderr, _("%s: no flags given\n"), Prog);
exit (E_USAGE);
}
if (!is_shadow_pwd && (eflg || fflg)) {
fprintf (stderr,
_
("%s: shadow passwords required for -e and -f\n"),
Prog);
exit (E_USAGE);
}
if (optind != argc - 1)
usage ();
if (aflg && (!Gflg)) {
fprintf (stderr,
_("%s: -a flag is ONLY allowed with the -G flag\n"),
Prog);
usage ();
exit (E_USAGE);
}
if (dflg && strcmp (user_home, user_newhome) == 0)
dflg = mflg = 0;
if (uflg && user_id == user_newid)
uflg = oflg = 0;
if (lflg && getpwnam (user_newname)) {
fprintf (stderr, _("%s: user %s exists\n"), Prog, user_newname);
exit (E_NAME_IN_USE);
}
if (uflg && !oflg && getpwuid (user_newid)) {
fprintf (stderr, _("%s: uid %lu is not unique\n"),
Prog, (unsigned long) user_newid);
exit (E_UID_IN_USE);
}
}
/*
* close_files - close all of the files that were opened
*
* close_files() closes all of the files that were opened for this new
* user. This causes any modified entries to be written out.
*/
static void close_files (void)
{
if (!pw_close ()) {
fprintf (stderr, _("%s: cannot rewrite password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd && !spw_close ()) {
fprintf (stderr,
_("%s: cannot rewrite shadow password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd)
spw_unlock ();
(void) pw_unlock ();
/*
* Close the DBM and/or flat files
*/
endpwent ();
endspent ();
endgrent ();
#ifdef SHADOWGRP
endsgent ();
#endif
}
/*
* open_files - lock and open the password files
*
* open_files() opens the two password files.
*/
static void open_files (void)
{
if (!pw_lock ()) {
fprintf (stderr, _("%s: unable to lock password file\n"), Prog);
exit (E_PW_UPDATE);
}
if (!pw_open (O_RDWR)) {
fprintf (stderr, _("%s: unable to open password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd && !spw_lock ()) {
fprintf (stderr,
_("%s: cannot lock shadow password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd && !spw_open (O_RDWR)) {
fprintf (stderr,
_("%s: cannot open shadow password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
}
/*
* usr_update - create the user entries
*
* usr_update() creates the password file entries for this user and
* will update the group entries if required.
*/
static void usr_update (void)
{
struct passwd pwent;
const struct passwd *pwd;
struct spwd spent;
const struct spwd *spwd = NULL;
/*
* Locate the entry in /etc/passwd, which MUST exist.
*/
pwd = pw_locate (user_name);
if (!pwd) {
fprintf (stderr, _("%s: %s not found in /etc/passwd\n"),
Prog, user_name);
fail_exit (E_NOTFOUND);
}
pwent = *pwd;
new_pwent (&pwent);
/*
* Locate the entry in /etc/shadow. It doesn't have to exist, and
* won't be created if it doesn't.
*/
if (is_shadow_pwd && (spwd = spw_locate (user_name))) {
spent = *spwd;
new_spent (&spent);
}
if (lflg || uflg || gflg || cflg || dflg || sflg || pflg
|| Lflg || Uflg) {
if (!pw_update (&pwent)) {
fprintf (stderr,
_("%s: error changing password entry\n"),
Prog);
fail_exit (E_PW_UPDATE);
}
if (lflg && !pw_remove (user_name)) {
fprintf (stderr,
_("%s: error removing password entry\n"),
Prog);
fail_exit (E_PW_UPDATE);
}
}
if (spwd && (lflg || eflg || fflg || pflg || Lflg || Uflg)) {
if (!spw_update (&spent)) {
fprintf (stderr,
_
("%s: error adding new shadow password entry\n"),
Prog);
fail_exit (E_PW_UPDATE);
}
if (lflg && !spw_remove (user_name)) {
fprintf (stderr,
_
("%s: error removing shadow password entry\n"),
Prog);
fail_exit (E_PW_UPDATE);
}
}
}
/*
* move_home - move the user's home directory
*
* move_home() moves the user's home directory to a new location. The
* files will be copied if the directory cannot simply be renamed.
*/
static void move_home (void)
{
struct stat sb;
if (mflg && stat (user_home, &sb) == 0) {
/*
* Don't try to move it if it is not a directory
* (but /dev/null for example). --marekm
*/
if (!S_ISDIR (sb.st_mode))
return;
if (access (user_newhome, F_OK) == 0) {
fprintf (stderr, _("%s: directory %s exists\n"),
Prog, user_newhome);
fail_exit (E_HOMEDIR);
} else if (rename (user_home, user_newhome)) {
if (errno == EXDEV) {
if (mkdir (user_newhome, sb.st_mode & 0777)) {
fprintf (stderr,
_
("%s: can't create %s\n"),
Prog, user_newhome);
}
if (chown (user_newhome, sb.st_uid, sb.st_gid)) {
fprintf (stderr,
_("%s: can't chown %s\n"),
Prog, user_newhome);
rmdir (user_newhome);
fail_exit (E_HOMEDIR);
}
if (copy_tree (user_home, user_newhome,
uflg ? user_newid : -1,
gflg ? user_newgid : -1) == 0) {
if (remove_tree (user_home) != 0 ||
rmdir (user_home) != 0)
fprintf (stderr,
_
("%s: warning: failed to completely remove old home directory %s"),
Prog, user_home);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK,
Prog,
"moving home directory",
user_newname, user_newid,
1);
#endif
return;
}
(void) remove_tree (user_newhome);
(void) rmdir (user_newhome);
}
fprintf (stderr,
_
("%s: cannot rename directory %s to %s\n"),
Prog, user_home, user_newhome);
fail_exit (E_HOMEDIR);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"moving home directory", user_newname, user_newid,
1);
#endif
}
if (uflg || gflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing home directory owner", user_newname,
user_newid, 1);
#endif
chown (dflg ? user_newhome : user_home,
uflg ? user_newid : user_id,
gflg ? user_newgid : user_gid);
}
}
/*
* update_files - update the lastlog and faillog files
*/
static void update_files (void)
{
struct lastlog ll;
struct faillog fl;
int fd;
/*
* Relocate the "lastlog" entries for the user. The old entry is
* left alone in case the UID was shared. It doesn't hurt anything
* to just leave it be.
*/
if ((fd = open (LASTLOG_FILE, O_RDWR)) != -1) {
lseek (fd, (off_t) user_id * sizeof ll, SEEK_SET);
if (read (fd, (char *) &ll, sizeof ll) == sizeof ll) {
lseek (fd, (off_t) user_newid * sizeof ll, SEEK_SET);
write (fd, (char *) &ll, sizeof ll);
}
close (fd);
}
/*
* Relocate the "faillog" entries in the same manner.
*/
if ((fd = open (FAILLOG_FILE, O_RDWR)) != -1) {
lseek (fd, (off_t) user_id * sizeof fl, SEEK_SET);
if (read (fd, (char *) &fl, sizeof fl) == sizeof fl) {
lseek (fd, (off_t) user_newid * sizeof fl, SEEK_SET);
write (fd, (char *) &fl, sizeof fl);
}
close (fd);
}
}
#ifndef NO_MOVE_MAILBOX
/*
* This is the new and improved code to carefully chown/rename the user's
* mailbox. Maybe I am too paranoid but the mail spool dir sometimes
* happens to be mode 1777 (this makes mail user agents work without
* being setgid mail, but is NOT recommended; they all should be fixed
* to use movemail). --marekm
*/
static void move_mailbox (void)
{
const char *maildir;
char mailfile[1024], newmailfile[1024];
int fd;
struct stat st;
maildir = getdef_str ("MAIL_DIR");
#ifdef MAIL_SPOOL_DIR
if (!maildir && !getdef_str ("MAIL_FILE"))
maildir = MAIL_SPOOL_DIR;
#endif
if (!maildir)
return;
/*
* O_NONBLOCK is to make sure open won't hang on mandatory locks.
* We do fstat/fchown to make sure there are no races (someone
* replacing /var/spool/mail/luser with a hard link to /etc/passwd
* between stat and chown). --marekm
*/
snprintf (mailfile, sizeof mailfile, "%s/%s", maildir, user_name);
fd = open (mailfile, O_RDONLY | O_NONBLOCK, 0);
if (fd < 0) {
/* no need for warnings if the mailbox doesn't exist */
if (errno != ENOENT)
perror (mailfile);
return;
}
if (fstat (fd, &st) < 0) {
perror ("fstat");
close (fd);
return;
}
if (st.st_uid != user_id) {
/* better leave it alone */
fprintf (stderr, _("%s: warning: %s not owned by %s\n"),
Prog, mailfile, user_name);
close (fd);
return;
}
if (uflg) {
if (fchown (fd, user_newid, (gid_t) - 1) < 0) {
perror (_("failed to change mailbox owner"));
}
#ifdef WITH_AUDIT
else {
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing mail file owner", user_newname,
user_newid, 1);
}
#endif
}
close (fd);
if (lflg) {
snprintf (newmailfile, sizeof newmailfile, "%s/%s",
maildir, user_newname);
if (link (mailfile, newmailfile) || unlink (mailfile)) {
perror (_("failed to rename mailbox"));
}
#ifdef WITH_AUDIT
else {
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing mail file name", user_newname,
user_newid, 1);
}
#endif
}
}
#endif
/*
* main - usermod command
*/
int main (int argc, char **argv)
{
int grp_err = 0;
#ifdef USE_PAM
pam_handle_t *pamh = NULL;
struct passwd *pampw;
int retval;
#endif
#ifdef WITH_AUDIT
audit_help_open ();
#endif
/*
* Get my name so that I can use it to report errors.
*/
Prog = Basename (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
sys_ngroups = sysconf (_SC_NGROUPS_MAX);
user_groups = malloc ((1 + sys_ngroups) * sizeof (char *));
user_groups[0] = (char *) 0;
OPENLOG ("usermod");
is_shadow_pwd = spw_file_present ();
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present ();
#endif
process_flags (argc, argv);
#ifdef USE_PAM
retval = PAM_SUCCESS;
pampw = getpwuid (getuid ());
if (pampw == NULL) {
retval = PAM_USER_UNKNOWN;
}
if (retval == PAM_SUCCESS) {
retval = pam_start ("usermod", pampw->pw_name, &conv, &pamh);
}
if (retval == PAM_SUCCESS) {
retval = pam_authenticate (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval == PAM_SUCCESS) {
retval = pam_acct_mgmt (pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end (pamh, retval);
}
}
if (retval != PAM_SUCCESS) {
fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
exit (1);
}
#endif /* USE_PAM */
/*
* Do the hard stuff - open the files, change the user entries,
* change the home directory, then close and update the files.
*/
open_files ();
usr_update ();
close_files ();
nscd_flush_cache ("passwd");
nscd_flush_cache ("group");
if (Gflg || lflg)
grp_err = grp_update ();
if (mflg)
move_home ();
#ifndef NO_MOVE_MAILBOX
if (lflg || uflg)
move_mailbox ();
#endif
if (uflg) {
update_files ();
/*
* Change the UID on all of the files owned by `user_id' to
* `user_newid' in the user's home directory.
*/
chown_tree (dflg ? user_newhome : user_home,
user_id, user_newid,
user_gid, gflg ? user_newgid : user_gid);
}
if (grp_err)
exit (E_GRP_UPDATE);
#ifdef USE_PAM
if (retval == PAM_SUCCESS)
pam_end (pamh, PAM_SUCCESS);
#endif /* USE_PAM */
exit (E_SUCCESS);
/* NOT REACHED */
}
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