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shadow/src/usermod.c
Serge Hallyn e01bad7d3c Merge pull request #4 from xnox/master 
Make shadow more robust in hostile environments
2015-11-12 23:07:29 -06:00

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/*
* Copyright (c) 1991 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2000 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 - 2011, Nicolas François
* 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. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT
* HOLDERS 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 ACCT_TOOLS_SETUID
#ifdef USE_PAM
#include "pam_defs.h"
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
#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"
#ifdef ENABLE_SUBIDS
#include "subordinateio.h"
#endif /* ENABLE_SUBIDS */
#ifdef WITH_TCB
#include "tcbfuncs.h"
#endif
/*
* 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).
*/
/*@-exitarg@*/
#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 E_SE_UPDATE 13 /* can't update SELinux user mapping */
#ifdef ENABLE_SUBIDS
#define E_SUB_UID_UPDATE 16 /* can't update the subordinate uid file */
#define E_SUB_GID_UPDATE 18 /* can't update the subordinate gid file */
#endif /* ENABLE_SUBIDS */
#define VALID(s) (strcspn (s, ":\n") == strlen (s))
/*
* Global variables
*/
const char *Prog;
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_newcomment;
static char *user_home;
static char *user_newhome;
static char *user_shell;
#ifdef WITH_SELINUX
static const char *user_selinux = "";
#endif /* WITH_SELINUX */
static char *user_newshell;
static long user_expire;
static long user_newexpire;
static long user_inactive;
static long user_newinactive;
static long sys_ngroups;
static char **user_groups; /* NULL-terminated list */
static bool
aflg = false, /* append to existing secondary group set */
cflg = false, /* new comment (GECOS) field */
dflg = false, /* new home directory */
eflg = false, /* days since 1970-01-01 when account becomes expired */
fflg = false, /* days until account with expired password is locked */
gflg = false, /* new primary group ID */
Gflg = false, /* new secondary group set */
Lflg = false, /* lock the password */
lflg = false, /* new user name */
mflg = false, /* create user's home directory if it doesn't exist */
oflg = false, /* permit non-unique user ID to be specified with -u */
pflg = false, /* new encrypted password */
sflg = false, /* new shell program */
#ifdef WITH_SELINUX
Zflg = false, /* new selinux user */
#endif
#ifdef ENABLE_SUBIDS
vflg = false, /* add subordinate uids */
Vflg = false, /* delete subordinate uids */
wflg = false, /* add subordinate gids */
Wflg = false, /* delete subordinate gids */
#endif /* ENABLE_SUBIDS */
uflg = false, /* specify new user ID */
Uflg = false; /* unlock the password */
static bool is_shadow_pwd;
#ifdef SHADOWGRP
static bool is_shadow_grp;
#endif
#ifdef ENABLE_SUBIDS
static bool is_sub_uid = false;
static bool is_sub_gid = false;
#endif /* ENABLE_SUBIDS */
static bool pw_locked = false;
static bool spw_locked = false;
static bool gr_locked = false;
#ifdef SHADOWGRP
static bool sgr_locked = false;
#endif
#ifdef ENABLE_SUBIDS
static bool sub_uid_locked = false;
static bool sub_gid_locked = false;
#endif /* ENABLE_SUBIDS */
/* local function prototypes */
static void date_to_str (/*@unique@*//*@out@*/char *buf, size_t maxsize,
long int date);
static int get_groups (char *);
static /*@noreturn@*/void usage (int status);
static void new_pwent (struct passwd *);
static void new_spent (struct spwd *);
static /*@noreturn@*/void fail_exit (int);
static void update_group (void);
#ifdef SHADOWGRP
static void update_gshadow (void);
#endif
static void grp_update (void);
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_lastlog (void);
static void update_faillog (void);
#ifndef NO_MOVE_MAILBOX
static void move_mailbox (void);
#endif
static void date_to_str (/*@unique@*//*@out@*/char *buf, size_t maxsize,
long int date)
{
struct tm *tp;
if (date < 0) {
strncpy (buf, "never", maxsize);
} else {
time_t t = (time_t) date;
tp = gmtime (&t);
#ifdef HAVE_STRFTIME
strftime (buf, maxsize, "%Y-%m-%d", tp);
#else
(void) snprintf (buf, maxsize, "%04d-%02d-%02d",
tp->tm_year + 1900,
tp->tm_mon + 1,
tp->tm_mday);
#endif /* HAVE_STRFTIME */
}
buf[maxsize - 1] = '\0';
}
/*
* 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 ('\0' == *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
*/
cp = strchr (list, ',');
if (NULL != cp) {
*cp = '\0';
cp++;
}
/*
* 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 (NULL == grp) {
fprintf (stderr, _("%s: group '%s' does not exist\n"),
Prog, list);
errors++;
}
list = cp;
/*
* If the group doesn't exist, don't dump core. Instead,
* try the next one. --marekm
*/
if (NULL == 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);
gr_free ((struct group *)grp);
continue;
}
#endif
if (ngroups == sys_ngroups) {
fprintf (stderr,
_("%s: too many groups specified (max %d).\n"),
Prog, ngroups);
gr_free ((struct group *)grp);
break;
}
/*
* Add the group name to the user's list of groups.
*/
user_groups[ngroups++] = xstrdup (grp->gr_name);
gr_free ((struct group *)grp);
} while (NULL != list);
user_groups[ngroups] = (char *) 0;
/*
* Any errors in finding group names are fatal
*/
if (0 != errors) {
return -1;
}
return 0;
}
#ifdef ENABLE_SUBIDS
struct ulong_range
{
unsigned long first;
unsigned long last;
};
static struct ulong_range getulong_range(const char *str)
{
struct ulong_range result = { .first = ULONG_MAX, .last = 0 };
long long first, last;
char *pos;
errno = 0;
first = strtoll(str, &pos, 10);
if (('\0' == *str) || ('-' != *pos ) || (ERANGE == errno) ||
(first != (unsigned long int)first))
goto out;
errno = 0;
last = strtoll(pos + 1, &pos, 10);
if (('\0' != *pos ) || (ERANGE == errno) ||
(last != (unsigned long int)last))
goto out;
if (first > last)
goto out;
result.first = (unsigned long int)first;
result.last = (unsigned long int)last;
out:
return result;
}
struct ulong_range_list_entry {
struct ulong_range_list_entry *next;
struct ulong_range range;
};
static struct ulong_range_list_entry *add_sub_uids = NULL, *del_sub_uids = NULL;
static struct ulong_range_list_entry *add_sub_gids = NULL, *del_sub_gids = NULL;
static int prepend_range(const char *str, struct ulong_range_list_entry **head)
{
struct ulong_range range;
struct ulong_range_list_entry *entry;
range = getulong_range(str);
if (range.first > range.last)
return 0;
entry = malloc(sizeof(*entry));
if (!entry) {
fprintf (stderr,
_("%s: failed to allocate memory: %s\n"),
Prog, strerror (errno));
return 0;
}
entry->next = *head;
entry->range = range;
*head = entry;
return 1;
}
#endif /* ENABLE_SUBIDS */
/*
* usage - display usage message and exit
*/
static /*@noreturn@*/void usage (int status)
{
FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
(void) fprintf (usageout,
_("Usage: %s [options] LOGIN\n"
"\n"
"Options:\n"),
Prog);
(void) fputs (_(" -c, --comment COMMENT new value of the GECOS field\n"), usageout);
(void) fputs (_(" -d, --home HOME_DIR new home directory for the user account\n"), usageout);
(void) fputs (_(" -e, --expiredate EXPIRE_DATE set account expiration date to EXPIRE_DATE\n"), usageout);
(void) fputs (_(" -f, --inactive INACTIVE set password inactive after expiration\n"
" to INACTIVE\n"), usageout);
(void) fputs (_(" -g, --gid GROUP force use GROUP as new primary group\n"), usageout);
(void) fputs (_(" -G, --groups GROUPS new list of supplementary GROUPS\n"), usageout);
(void) fputs (_(" -a, --append append the user to the supplemental GROUPS\n"
" mentioned by the -G option without removing\n"
" him/her from other groups\n"), usageout);
(void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
(void) fputs (_(" -l, --login NEW_LOGIN new value of the login name\n"), usageout);
(void) fputs (_(" -L, --lock lock the user account\n"), usageout);
(void) fputs (_(" -m, --move-home move contents of the home directory to the\n"
" new location (use only with -d)\n"), usageout);
(void) fputs (_(" -o, --non-unique allow using duplicate (non-unique) UID\n"), usageout);
(void) fputs (_(" -p, --password PASSWORD use encrypted password for the new password\n"), usageout);
(void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
(void) fputs (_(" -s, --shell SHELL new login shell for the user account\n"), usageout);
(void) fputs (_(" -u, --uid UID new UID for the user account\n"), usageout);
(void) fputs (_(" -U, --unlock unlock the user account\n"), usageout);
#ifdef ENABLE_SUBIDS
(void) fputs (_(" -v, --add-subuids FIRST-LAST add range of subordinate uids\n"), usageout);
(void) fputs (_(" -V, --del-subuids FIRST-LAST remove range of subordinate uids\n"), usageout);
(void) fputs (_(" -w, --add-subgids FIRST-LAST add range of subordinate gids\n"), usageout);
(void) fputs (_(" -W, --del-subgids FIRST-LAST remove range of subordinate gids\n"), usageout);
#endif /* ENABLE_SUBIDS */
#ifdef WITH_SELINUX
(void) fputs (_(" -Z, --selinux-user SEUSER new SELinux user mapping for the user account\n"), usageout);
#endif /* WITH_SELINUX */
(void) fputs ("\n", usageout);
exit (status);
}
/*
* update encrypted password string (for both shadow and non-shadow
* passwords)
*/
static char *new_pw_passwd (char *pw_pass)
{
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, (unsigned int) user_newid, 0);
#endif
SYSLOG ((LOG_INFO, "lock user '%s' password", user_newname));
strcpy (buf, "!");
strcat (buf, pw_pass);
pw_pass = buf;
} else if (Uflg && pw_pass[0] == '!') {
char *s;
if (pw_pass[1] == '\0') {
fprintf (stderr,
_("%s: unlocking the user's password would result in a passwordless account.\n"
"You should set a password with usermod -p to unlock this user's password.\n"),
Prog);
return pw_pass;
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"updating password",
user_newname, (unsigned int) user_newid, 0);
#endif
SYSLOG ((LOG_INFO, "unlock user '%s' password", user_newname));
s = pw_pass;
while ('\0' != *s) {
*s = *(s + 1);
s++;
}
} else if (pflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing password",
user_newname, (unsigned int) user_newid, 1);
#endif
SYSLOG ((LOG_INFO, "change user '%s' password", user_newname));
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) {
if (pw_locate (user_newname) != NULL) {
/* This should never happen.
* It was already checked that the user doesn't
* exist on the system.
*/
fprintf (stderr,
_("%s: user '%s' already exists in %s\n"),
Prog, user_newname, pw_dbname ());
fail_exit (E_NAME_IN_USE);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing name",
user_newname, (unsigned int) user_newid, 1);
#endif
SYSLOG ((LOG_INFO,
"change user name '%s' to '%s'",
pwent->pw_name, user_newname));
pwent->pw_name = xstrdup (user_newname);
}
/* Update the password in passwd if there is no shadow file or if
* the password is currently in passwd (pw_passwd != "x").
* We do not force the usage of shadow passwords if they are not
* used for this account.
*/
if ( (!is_shadow_pwd)
|| (strcmp (pwent->pw_passwd, SHADOW_PASSWD_STRING) != 0)) {
pwent->pw_passwd = new_pw_passwd (pwent->pw_passwd);
}
if (uflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing uid",
user_newname, (unsigned int) 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, (unsigned int) 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, (unsigned int) user_newid, 1);
#endif
pwent->pw_gecos = user_newcomment;
}
if (dflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing home directory",
user_newname, (unsigned int) 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, (unsigned int) user_newid, 1);
#endif
SYSLOG ((LOG_INFO,
"change user '%s' shell from '%s' to '%s'",
pwent->pw_name, pwent->pw_shell, user_newshell));
pwent->pw_shell = user_newshell;
}
}
/*
* 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) {
if (spw_locate (user_newname) != NULL) {
fprintf (stderr,
_("%s: user '%s' already exists in %s\n"),
Prog, user_newname, spw_dbname ());
fail_exit (E_NAME_IN_USE);
}
spent->sp_namp = xstrdup (user_newname);
}
if (fflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing inactive days",
user_newname, (unsigned int) user_newid, 1);
#endif
SYSLOG ((LOG_INFO,
"change user '%s' inactive from '%ld' to '%ld'",
spent->sp_namp, spent->sp_inact, user_newinactive));
spent->sp_inact = user_newinactive;
}
if (eflg) {
/* log dates rather than numbers of days. */
char new_exp[16], old_exp[16];
date_to_str (new_exp, sizeof(new_exp),
user_newexpire * DAY);
date_to_str (old_exp, sizeof(old_exp),
user_expire * DAY);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing expiration date",
user_newname, (unsigned int) user_newid, 1);
#endif
SYSLOG ((LOG_INFO,
"change user '%s' expiration from '%s' to '%s'",
spent->sp_namp, old_exp, new_exp));
spent->sp_expire = user_newexpire;
}
/* Always update the shadowed password if there is a shadow entry
* (even if shadowed passwords might not be enabled for this
* account (pw_passwd != "x")).
* It seems better to update the password in both places in case a
* shadow and a non shadow entry exist.
* This might occur if:
* + there were already both entries
* + aging has been requested
*/
spent->sp_pwdp = new_pw_passwd (spent->sp_pwdp);
if (pflg) {
spent->sp_lstchg = (long) time ((time_t *) 0) / SCALE;
if (0 == spent->sp_lstchg) {
/* Better disable aging than requiring a password
* change. */
spent->sp_lstchg = -1;
}
}
}
/*
* fail_exit - exit with an error code after unlocking files
*/
static /*@noreturn@*/void fail_exit (int code)
{
if (gr_locked) {
if (gr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
/* continue */
}
}
#ifdef SHADOWGRP
if (sgr_locked) {
if (sgr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
/* continue */
}
}
#endif
if (spw_locked) {
if (spw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
/* continue */
}
}
if (pw_locked) {
if (pw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
/* continue */
}
}
#ifdef ENABLE_SUBIDS
if (sub_uid_locked) {
if (sub_uid_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_uid_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sub_uid_dbname ()));
/* continue */
}
}
if (sub_gid_locked) {
if (sub_gid_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_gid_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sub_gid_dbname ()));
/* continue */
}
}
#endif /* ENABLE_SUBIDS */
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"modifying account",
user_name, AUDIT_NO_ID, 0);
#endif
exit (code);
}
static void update_group (void)
{
bool is_member;
bool was_member;
bool changed;
const struct group *grp;
struct group *ngrp;
changed = false;
/*
* Scan through the entire group file looking for the groups that
* the user is a member of.
*/
while ((grp = gr_next ()) != NULL) {
/*
* 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 && ( (was_member && aflg)
|| is_on_list (user_groups, grp->gr_name));
if (!was_member && !is_member) {
continue;
}
ngrp = __gr_dup (grp);
if (NULL == ngrp) {
fprintf (stderr,
_("%s: Out of memory. Cannot update %s.\n"),
Prog, gr_dbname ());
fail_exit (E_GRP_UPDATE);
}
if (was_member) {
if ((!Gflg) || is_member) {
/* User was a member and is still a member
* of this group.
* But the user might have been renamed.
*/
if (lflg) {
ngrp->gr_mem = del_list (ngrp->gr_mem,
user_name);
ngrp->gr_mem = add_list (ngrp->gr_mem,
user_newname);
changed = true;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing group member",
user_newname, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO,
"change '%s' to '%s' in group '%s'",
user_name, user_newname,
ngrp->gr_name));
}
} else {
/* User was a member but is no more a
* member of this group.
*/
ngrp->gr_mem = del_list (ngrp->gr_mem, user_name);
changed = true;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"removing group member",
user_name, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO,
"delete '%s' from group '%s'",
user_name, ngrp->gr_name));
}
} else {
/* User was not a member but is now a member this
* group.
*/
ngrp->gr_mem = add_list (ngrp->gr_mem, user_newname);
changed = true;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"adding user to group",
user_name, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "add '%s' to group '%s'",
user_newname, ngrp->gr_name));
}
if (!changed) {
continue;
}
changed = false;
if (gr_update (ngrp) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, gr_dbname (), ngrp->gr_name);
SYSLOG ((LOG_WARN, "failed to prepare the new %s entry '%s'", gr_dbname (), ngrp->gr_name));
fail_exit (E_GRP_UPDATE);
}
}
}
#ifdef SHADOWGRP
static void update_gshadow (void)
{
bool is_member;
bool was_member;
bool was_admin;
bool changed;
const struct sgrp *sgrp;
struct sgrp *nsgrp;
changed = false;
/*
* Scan through the entire shadow group file looking for the groups
* that the user is a member of.
*/
while ((sgrp = sgr_next ()) != NULL) {
/*
* 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 && ( (was_member && aflg)
|| is_on_list (user_groups, sgrp->sg_name));
if (!was_member && !was_admin && !is_member) {
continue;
}
nsgrp = __sgr_dup (sgrp);
if (NULL == nsgrp) {
fprintf (stderr,
_("%s: Out of memory. Cannot update %s.\n"),
Prog, sgr_dbname ());
fail_exit (E_GRP_UPDATE);
}
if (was_admin && lflg) {
/* User was an admin of this group but the user
* has been renamed.
*/
nsgrp->sg_adm = del_list (nsgrp->sg_adm, user_name);
nsgrp->sg_adm = add_list (nsgrp->sg_adm, user_newname);
changed = true;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing admin name in shadow group",
user_name, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO,
"change admin '%s' to '%s' in shadow group '%s'",
user_name, user_newname, nsgrp->sg_name));
}
if (was_member) {
if ((!Gflg) || is_member) {
/* User was a member and is still a member
* of this group.
* But the user might have been renamed.
*/
if (lflg) {
nsgrp->sg_mem = del_list (nsgrp->sg_mem,
user_name);
nsgrp->sg_mem = add_list (nsgrp->sg_mem,
user_newname);
changed = true;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing member in shadow group",
user_name, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO,
"change '%s' to '%s' in shadow group '%s'",
user_name, user_newname,
nsgrp->sg_name));
}
} else {
/* User was a member but is no more a
* member of this group.
*/
nsgrp->sg_mem = del_list (nsgrp->sg_mem, user_name);
changed = true;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"removing user from shadow group",
user_name, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO,
"delete '%s' from shadow group '%s'",
user_name, nsgrp->sg_name));
}
} else if (is_member) {
/* User was not a member but is now a member this
* group.
*/
nsgrp->sg_mem = add_list (nsgrp->sg_mem, user_newname);
changed = true;
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"adding user to shadow group",
user_newname, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "add '%s' to shadow group '%s'",
user_newname, nsgrp->sg_name));
}
if (!changed) {
continue;
}
changed = false;
/*
* Update the group entry to reflect the changes.
*/
if (sgr_update (nsgrp) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, sgr_dbname (), nsgrp->sg_name);
SYSLOG ((LOG_WARN, "failed to prepare the new %s entry '%s'",
sgr_dbname (), nsgrp->sg_name));
fail_exit (E_GRP_UPDATE);
}
}
}
#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 void grp_update (void)
{
update_group ();
#ifdef SHADOWGRP
if (is_shadow_grp) {
update_gshadow ();
}
#endif
}
/*
* 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;
bool anyflag = false;
{
/*
* 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'},
{"root", required_argument, NULL, 'R'},
{"shell", required_argument, NULL, 's'},
{"uid", required_argument, NULL, 'u'},
{"unlock", no_argument, NULL, 'U'},
#ifdef ENABLE_SUBIDS
{"add-subuids", required_argument, NULL, 'v'},
{"del-subuids", required_argument, NULL, 'V'},
{"add-subgids", required_argument, NULL, 'w'},
{"del-subgids", required_argument, NULL, 'W'},
#endif /* ENABLE_SUBIDS */
#ifdef WITH_SELINUX
{"selinux-user", required_argument, NULL, 'Z'},
#endif /* WITH_SELINUX */
{NULL, 0, NULL, '\0'}
};
while ((c = getopt_long (argc, argv,
"ac:d:e:f:g:G:hl:Lmop:R:s:u:U"
#ifdef ENABLE_SUBIDS
"v:w:V:W:"
#endif /* ENABLE_SUBIDS */
#ifdef WITH_SELINUX
"Z:"
#endif /* WITH_SELINUX */
, long_options, NULL)) != -1) {
switch (c) {
case 'a':
aflg = true;
break;
case 'c':
if (!VALID (optarg)) {
fprintf (stderr,
_("%s: invalid field '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
user_newcomment = optarg;
cflg = true;
break;
case 'd':
if (!VALID (optarg)) {
fprintf (stderr,
_("%s: invalid field '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
dflg = true;
user_newhome = optarg;
break;
case 'e':
if ('\0' != *optarg) {
user_newexpire = strtoday (optarg);
if (user_newexpire < -1) {
fprintf (stderr,
_("%s: invalid date '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
user_newexpire *= DAY / SCALE;
} else {
user_newexpire = -1;
}
eflg = true;
break;
case 'f':
if ( (getlong (optarg, &user_newinactive) == 0)
|| (user_newinactive < -1)) {
fprintf (stderr,
_("%s: invalid numeric argument '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
fflg = true;
break;
case 'g':
grp = getgr_nam_gid (optarg);
if (NULL == grp) {
fprintf (stderr,
_("%s: group '%s' does not exist\n"),
Prog, optarg);
exit (E_NOTFOUND);
}
user_newgid = grp->gr_gid;
gflg = true;
break;
case 'G':
if (get_groups (optarg) != 0) {
exit (E_NOTFOUND);
}
Gflg = true;
break;
case 'h':
usage (E_SUCCESS);
/*@notreached@*/break;
case 'l':
if (!is_valid_user_name (optarg)) {
fprintf (stderr,
_("%s: invalid user name '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
lflg = true;
user_newname = optarg;
break;
case 'L':
Lflg = true;
break;
case 'm':
mflg = true;
break;
case 'o':
oflg = true;
break;
case 'p':
user_pass = optarg;
pflg = true;
break;
case 'R': /* no-op, handled in process_root_flag () */
break;
case 's':
if (!VALID (optarg)) {
fprintf (stderr,
_("%s: invalid field '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
user_newshell = optarg;
sflg = true;
break;
case 'u':
if ( (get_uid (optarg, &user_newid) ==0)
|| (user_newid == (uid_t)-1)) {
fprintf (stderr,
_("%s: invalid user ID '%s'\n"),
Prog, optarg);
exit (E_BAD_ARG);
}
uflg = true;
break;
case 'U':
Uflg = true;
break;
#ifdef ENABLE_SUBIDS
case 'v':
if (prepend_range (optarg, &add_sub_uids) == 0) {
fprintf (stderr,
_("%s: invalid subordinate uid range '%s'\n"),
Prog, optarg);
exit(E_BAD_ARG);
}
vflg = true;
break;
case 'V':
if (prepend_range (optarg, &del_sub_uids) == 0) {
fprintf (stderr,
_("%s: invalid subordinate uid range '%s'\n"),
Prog, optarg);
exit(E_BAD_ARG);
}
Vflg = true;
break;
case 'w':
if (prepend_range (optarg, &add_sub_gids) == 0) {
fprintf (stderr,
_("%s: invalid subordinate gid range '%s'\n"),
Prog, optarg);
exit(E_BAD_ARG);
}
wflg = true;
break;
case 'W':
if (prepend_range (optarg, &del_sub_gids) == 0) {
fprintf (stderr,
_("%s: invalid subordinate gid range '%s'\n"),
Prog, optarg);
exit(E_BAD_ARG);
}
Wflg = true;
break;
#endif /* ENABLE_SUBIDS */
#ifdef WITH_SELINUX
case 'Z':
if (is_selinux_enabled () > 0) {
user_selinux = optarg;
Zflg = true;
} else {
fprintf (stderr,
_("%s: -Z requires SELinux enabled kernel\n"),
Prog);
exit (E_BAD_ARG);
}
break;
#endif /* WITH_SELINUX */
default:
usage (E_USAGE);
}
anyflag = true;
}
}
if (optind != argc - 1) {
usage (E_USAGE);
}
user_name = argv[argc - 1];
{
const struct passwd *pwd;
/* local, no need for xgetpwnam */
pwd = getpwnam (user_name);
if (NULL == pwd) {
fprintf (stderr,
_("%s: user '%s' does not exist\n"),
Prog, user_name);
exit (E_NOTFOUND);
}
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);
}
/* user_newname, user_newid, user_newgid can be used even when the
* options where not specified. */
if (!lflg) {
user_newname = user_name;
}
if (!uflg) {
user_newid = user_id;
}
if (!gflg) {
user_newgid = user_gid;
}
#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
{
const struct spwd *spwd = NULL;
/* local, no need for xgetspnam */
if (is_shadow_pwd && ((spwd = getspnam (user_name)) != NULL)) {
user_expire = spwd->sp_expire;
user_inactive = spwd->sp_inact;
}
}
if (!anyflag) {
fprintf (stderr, _("%s: no options\n"), Prog);
usage (E_USAGE);
}
if (aflg && (!Gflg)) {
fprintf (stderr,
_("%s: %s flag is only allowed with the %s flag\n"),
Prog, "-a", "-G");
usage (E_USAGE);
}
if ((Lflg && (pflg || Uflg)) || (pflg && Uflg)) {
fprintf (stderr,
_("%s: the -L, -p, and -U flags are exclusive\n"),
Prog);
usage (E_USAGE);
}
if (oflg && !uflg) {
fprintf (stderr,
_("%s: %s flag is only allowed with the %s flag\n"),
Prog, "-o", "-u");
usage (E_USAGE);
}
if (mflg && !dflg) {
fprintf (stderr,
_("%s: %s flag is only allowed with the %s flag\n"),
Prog, "-m", "-d");
usage (E_USAGE);
}
if (user_newid == user_id) {
uflg = false;
oflg = false;
}
if (user_newgid == user_gid) {
gflg = false;
}
if ( (NULL != user_newshell)
&& (strcmp (user_newshell, user_shell) == 0)) {
sflg = false;
}
if (strcmp (user_newname, user_name) == 0) {
lflg = false;
}
if (user_newinactive == user_inactive) {
fflg = false;
}
if (user_newexpire == user_expire) {
eflg = false;
}
if ( (NULL != user_newhome)
&& (strcmp (user_newhome, user_home) == 0)) {
dflg = false;
mflg = false;
}
if ( (NULL != user_newcomment)
&& (strcmp (user_newcomment, user_comment) == 0)) {
cflg = false;
}
if (!(Uflg || uflg || sflg || pflg || mflg || Lflg ||
lflg || Gflg || gflg || fflg || eflg || dflg || cflg
#ifdef ENABLE_SUBIDS
|| vflg || Vflg || wflg || Wflg
#endif /* ENABLE_SUBIDS */
#ifdef WITH_SELINUX
|| Zflg
#endif /* WITH_SELINUX */
)) {
fprintf (stderr, _("%s: no changes\n"), Prog);
exit (E_SUCCESS);
}
if (!is_shadow_pwd && (eflg || fflg)) {
fprintf (stderr,
_("%s: shadow passwords required for -e and -f\n"),
Prog);
exit (E_USAGE);
}
/* local, no need for xgetpwnam */
if (lflg && (getpwnam (user_newname) != NULL)) {
fprintf (stderr,
_("%s: user '%s' already exists\n"),
Prog, user_newname);
exit (E_NAME_IN_USE);
}
/* local, no need for xgetpwuid */
if (uflg && !oflg && (getpwuid (user_newid) != NULL)) {
fprintf (stderr,
_("%s: UID '%lu' already exists\n"),
Prog, (unsigned long) user_newid);
exit (E_UID_IN_USE);
}
#ifdef ENABLE_SUBIDS
if ( (vflg || Vflg)
&& !is_sub_uid) {
fprintf (stderr,
_("%s: %s does not exist, you cannot use the flags %s or %s\n"),
Prog, sub_uid_dbname (), "-v", "-V");
exit (E_USAGE);
}
if ( (wflg || Wflg)
&& !is_sub_gid) {
fprintf (stderr,
_("%s: %s does not exist, you cannot use the flags %s or %s\n"),
Prog, sub_gid_dbname (), "-w", "-W");
exit (E_USAGE);
}
#endif /* ENABLE_SUBIDS */
}
/*
* 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 () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"),
Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", pw_dbname ()));
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd && (spw_close () == 0)) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"),
Prog, spw_dbname ());
SYSLOG ((LOG_ERR,
"failure while writing changes to %s",
spw_dbname ()));
fail_exit (E_PW_UPDATE);
}
if (Gflg || lflg) {
if (gr_close () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"),
Prog, gr_dbname ());
SYSLOG ((LOG_ERR,
"failure while writing changes to %s",
gr_dbname ()));
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp) {
if (sgr_close () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"),
Prog, sgr_dbname ());
SYSLOG ((LOG_ERR,
"failure while writing changes to %s",
sgr_dbname ()));
fail_exit (E_GRP_UPDATE);
}
}
#endif
#ifdef SHADOWGRP
if (is_shadow_grp) {
if (sgr_unlock () == 0) {
fprintf (stderr,
_("%s: failed to unlock %s\n"),
Prog, sgr_dbname ());
SYSLOG ((LOG_ERR,
"failed to unlock %s",
sgr_dbname ()));
/* continue */
}
}
#endif
if (gr_unlock () == 0) {
fprintf (stderr,
_("%s: failed to unlock %s\n"),
Prog, gr_dbname ());
SYSLOG ((LOG_ERR,
"failed to unlock %s",
gr_dbname ()));
/* continue */
}
}
if (is_shadow_pwd) {
if (spw_unlock () == 0) {
fprintf (stderr,
_("%s: failed to unlock %s\n"),
Prog, spw_dbname ());
SYSLOG ((LOG_ERR,
"failed to unlock %s",
spw_dbname ()));
/* continue */
}
}
if (pw_unlock () == 0) {
fprintf (stderr,
_("%s: failed to unlock %s\n"),
Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
/* continue */
}
pw_locked = false;
spw_locked = false;
gr_locked = false;
#ifdef SHADOWGRP
sgr_locked = false;
#endif
#ifdef ENABLE_SUBIDS
if (vflg || Vflg) {
if (sub_uid_close () == 0) {
fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, sub_uid_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", sub_uid_dbname ()));
fail_exit (E_SUB_UID_UPDATE);
}
if (sub_uid_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_uid_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sub_uid_dbname ()));
/* continue */
}
sub_uid_locked = false;
}
if (wflg || Wflg) {
if (sub_gid_close () == 0) {
fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, sub_gid_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", sub_gid_dbname ()));
fail_exit (E_SUB_GID_UPDATE);
}
if (sub_gid_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_gid_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sub_gid_dbname ()));
/* continue */
}
sub_gid_locked = false;
}
#endif /* ENABLE_SUBIDS */
/*
* 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 () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, pw_dbname ());
fail_exit (E_PW_UPDATE);
}
pw_locked = true;
if (pw_open (O_CREAT | O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, pw_dbname ());
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd && (spw_lock () == 0)) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, spw_dbname ());
fail_exit (E_PW_UPDATE);
}
spw_locked = true;
if (is_shadow_pwd && (spw_open (O_CREAT | O_RDWR) == 0)) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, spw_dbname ());
fail_exit (E_PW_UPDATE);
}
if (Gflg || lflg) {
/*
* Lock and open the group file. This will load all of the
* group entries.
*/
if (gr_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, gr_dbname ());
fail_exit (E_GRP_UPDATE);
}
gr_locked = true;
if (gr_open (O_CREAT | O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, gr_dbname ());
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp && (sgr_lock () == 0)) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, sgr_dbname ());
fail_exit (E_GRP_UPDATE);
}
sgr_locked = true;
if (is_shadow_grp && (sgr_open (O_CREAT | O_RDWR) == 0)) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, sgr_dbname ());
fail_exit (E_GRP_UPDATE);
}
#endif
}
#ifdef ENABLE_SUBIDS
if (vflg || Vflg) {
if (sub_uid_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, sub_uid_dbname ());
fail_exit (E_SUB_UID_UPDATE);
}
sub_uid_locked = true;
if (sub_uid_open (O_CREAT | O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, sub_uid_dbname ());
fail_exit (E_SUB_UID_UPDATE);
}
}
if (wflg || Wflg) {
if (sub_gid_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, sub_gid_dbname ());
fail_exit (E_SUB_GID_UPDATE);
}
sub_gid_locked = true;
if (sub_gid_open (O_CREAT | O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, sub_gid_dbname ());
fail_exit (E_SUB_GID_UPDATE);
}
}
#endif /* ENABLE_SUBIDS */
}
/*
* 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 (NULL == pwd) {
fprintf (stderr,
_("%s: user '%s' does not exist in %s\n"),
Prog, user_name, pw_dbname ());
fail_exit (E_NOTFOUND);
}
pwent = *pwd;
new_pwent (&pwent);
/* If the shadow file does not exist, it won't be created */
if (is_shadow_pwd) {
spwd = spw_locate (user_name);
if (NULL != spwd) {
/* Update the shadow entry if it exists */
spent = *spwd;
new_spent (&spent);
} else if ( ( pflg
&& (strcmp (pwent.pw_passwd, SHADOW_PASSWD_STRING) == 0))
|| eflg || fflg) {
/* In some cases, we force the creation of a
* shadow entry:
* + new password requested and passwd indicates
* a shadowed password
* + aging information is requested
*/
memset (&spent, 0, sizeof spent);
spent.sp_namp = user_name;
/* The user explicitly asked for a shadow feature.
* Enable shadowed passwords for this new account.
*/
spent.sp_pwdp = xstrdup (pwent.pw_passwd);
pwent.pw_passwd = xstrdup (SHADOW_PASSWD_STRING);
spent.sp_lstchg = (long) time ((time_t *) 0) / SCALE;
if (0 == spent.sp_lstchg) {
/* Better disable aging than
* requiring a password change */
spent.sp_lstchg = -1;
}
spent.sp_min = getdef_num ("PASS_MIN_DAYS", -1);
spent.sp_max = getdef_num ("PASS_MAX_DAYS", -1);
spent.sp_warn = getdef_num ("PASS_WARN_AGE", -1);
spent.sp_inact = -1;
spent.sp_expire = -1;
spent.sp_flag = SHADOW_SP_FLAG_UNSET;
new_spent (&spent);
spwd = &spent; /* entry needs to be committed */
}
}
if (lflg || uflg || gflg || cflg || dflg || sflg || pflg
|| Lflg || Uflg) {
if (pw_update (&pwent) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, pw_dbname (), pwent.pw_name);
fail_exit (E_PW_UPDATE);
}
if (lflg && (pw_remove (user_name) == 0)) {
fprintf (stderr,
_("%s: cannot remove entry '%s' from %s\n"),
Prog, user_name, pw_dbname ());
fail_exit (E_PW_UPDATE);
}
}
if ((NULL != spwd) && (lflg || eflg || fflg || pflg || Lflg || Uflg)) {
if (spw_update (&spent) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, spw_dbname (), spent.sp_namp);
fail_exit (E_PW_UPDATE);
}
if (lflg && (spw_remove (user_name) == 0)) {
fprintf (stderr,
_("%s: cannot remove entry '%s' from %s\n"),
Prog, user_name, spw_dbname ());
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 (access (user_newhome, F_OK) == 0) {
/*
* If the new home directory already exist, the user
* should not use -m.
*/
fprintf (stderr,
_("%s: directory %s exists\n"),
Prog, user_newhome);
fail_exit (E_HOMEDIR);
}
if (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)) {
fprintf (stderr,
_("%s: The previous home directory (%s) was "
"not a directory. It is not removed and no "
"home directories are created.\n"),
Prog, user_home);
fail_exit (E_HOMEDIR);
}
if (rename (user_home, user_newhome) == 0) {
/* FIXME: rename above may have broken symlinks
* pointing to the user's home directory
* with an absolute path. */
if (chown_tree (user_newhome,
user_id, uflg ? user_newid : (uid_t)-1,
user_gid, gflg ? user_newgid : (gid_t)-1) != 0) {
fprintf (stderr,
_("%s: Failed to change ownership of the home directory"),
Prog);
fail_exit (E_HOMEDIR);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"moving home directory",
user_newname, (unsigned int) user_newid,
1);
#endif
return;
} else {
if (EXDEV == errno) {
if (copy_tree (user_home, user_newhome, true,
true,
user_id,
uflg ? user_newid : (uid_t)-1,
user_gid,
gflg ? user_newgid : (gid_t)-1) == 0) {
if (remove_tree (user_home, true) != 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,
(unsigned int) user_newid,
1);
#endif
return;
}
(void) remove_tree (user_newhome, true);
}
fprintf (stderr,
_("%s: cannot rename directory %s to %s\n"),
Prog, user_home, user_newhome);
fail_exit (E_HOMEDIR);
}
}
}
/*
* update_lastlog - update the lastlog file
*
* 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.
*/
static void update_lastlog (void)
{
struct lastlog ll;
int fd;
off_t off_uid = (off_t) user_id * sizeof ll;
off_t off_newuid = (off_t) user_newid * sizeof ll;
if (access (LASTLOG_FILE, F_OK) != 0) {
return;
}
fd = open (LASTLOG_FILE, O_RDWR);
if (-1 == fd) {
fprintf (stderr,
_("%s: failed to copy the lastlog entry of user %lu to user %lu: %s\n"),
Prog, (unsigned long) user_id, (unsigned long) user_newid, strerror (errno));
return;
}
if ( (lseek (fd, off_uid, SEEK_SET) == off_uid)
&& (read (fd, &ll, sizeof ll) == (ssize_t) sizeof ll)) {
/* Copy the old entry to its new location */
if ( (lseek (fd, off_newuid, SEEK_SET) != off_newuid)
|| (write (fd, &ll, sizeof ll) != (ssize_t) sizeof ll)
|| (fsync (fd) != 0)
|| (close (fd) != 0)) {
fprintf (stderr,
_("%s: failed to copy the lastlog entry of user %lu to user %lu: %s\n"),
Prog, (unsigned long) user_id, (unsigned long) user_newid, strerror (errno));
}
} else {
/* Assume lseek or read failed because there is
* no entry for the old UID */
/* Check if the new UID already has an entry */
if ( (lseek (fd, off_newuid, SEEK_SET) == off_newuid)
&& (read (fd, &ll, sizeof ll) == (ssize_t) sizeof ll)) {
/* Reset the new uid's lastlog entry */
memzero (&ll, sizeof (ll));
if ( (lseek (fd, off_newuid, SEEK_SET) != off_newuid)
|| (write (fd, &ll, sizeof ll) != (ssize_t) sizeof ll)
|| (fsync (fd) != 0)
|| (close (fd) != 0)) {
fprintf (stderr,
_("%s: failed to copy the lastlog entry of user %lu to user %lu: %s\n"),
Prog, (unsigned long) user_id, (unsigned long) user_newid, strerror (errno));
}
} else {
(void) close (fd);
}
}
}
/*
* update_faillog - update the faillog file
*
* Relocate the "faillog" 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.
*/
static void update_faillog (void)
{
struct faillog fl;
int fd;
off_t off_uid = (off_t) user_id * sizeof fl;
off_t off_newuid = (off_t) user_newid * sizeof fl;
if (access (FAILLOG_FILE, F_OK) != 0) {
return;
}
fd = open (FAILLOG_FILE, O_RDWR);
if (-1 == fd) {
fprintf (stderr,
_("%s: failed to copy the faillog entry of user %lu to user %lu: %s\n"),
Prog, (unsigned long) user_id, (unsigned long) user_newid, strerror (errno));
return;
}
if ( (lseek (fd, off_uid, SEEK_SET) == off_uid)
&& (read (fd, (char *) &fl, sizeof fl) == (ssize_t) sizeof fl)) {
/* Copy the old entry to its new location */
if ( (lseek (fd, off_newuid, SEEK_SET) != off_newuid)
|| (write (fd, &fl, sizeof fl) != (ssize_t) sizeof fl)
|| (fsync (fd) != 0)
|| (close (fd) != 0)) {
fprintf (stderr,
_("%s: failed to copy the faillog entry of user %lu to user %lu: %s\n"),
Prog, (unsigned long) user_id, (unsigned long) user_newid, strerror (errno));
}
} else {
/* Assume lseek or read failed because there is
* no entry for the old UID */
/* Check if the new UID already has an entry */
if ( (lseek (fd, off_newuid, SEEK_SET) == off_newuid)
&& (read (fd, &fl, sizeof fl) == (ssize_t) sizeof fl)) {
/* Reset the new uid's faillog entry */
memzero (&fl, sizeof (fl));
if ( (lseek (fd, off_newuid, SEEK_SET) != off_newuid)
|| (write (fd, &fl, sizeof fl) != (ssize_t) sizeof fl)
|| (close (fd) != 0)) {
fprintf (stderr,
_("%s: failed to copy the faillog entry of user %lu to user %lu: %s\n"),
Prog, (unsigned long) user_id, (unsigned long) user_newid, strerror (errno));
}
} else {
(void) 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 ((NULL == maildir) && (getdef_str ("MAIL_FILE") == NULL)) {
maildir = MAIL_SPOOL_DIR;
}
#endif
if (NULL == 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
*/
(void) snprintf (mailfile, sizeof mailfile, "%s/%s",
maildir, user_name);
mailfile[(sizeof mailfile) - 1] = '\0';
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");
(void) 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);
(void) 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, (unsigned int) user_newid, 1);
}
#endif
}
(void) close (fd);
if (lflg) {
(void) snprintf (newmailfile, sizeof newmailfile, "%s/%s",
maildir, user_newname);
newmailfile[(sizeof newmailfile) - 1] = '\0';
if ( (link (mailfile, newmailfile) != 0)
|| (unlink (mailfile) != 0)) {
perror (_("failed to rename mailbox"));
}
#ifdef WITH_AUDIT
else {
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing mail file name",
user_newname, (unsigned int) user_newid, 1);
}
#endif
}
}
#endif
/*
* main - usermod command
*/
int main (int argc, char **argv)
{
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
pam_handle_t *pamh = NULL;
int retval;
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
/*
* Get my name so that I can use it to report errors.
*/
Prog = Basename (argv[0]);
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
process_root_flag ("-R", argc, argv);
OPENLOG ("usermod");
#ifdef WITH_AUDIT
audit_help_open ();
#endif
sys_ngroups = sysconf (_SC_NGROUPS_MAX);
user_groups = (char **) malloc (sizeof (char *) * (1 + sys_ngroups));
user_groups[0] = (char *) 0;
is_shadow_pwd = spw_file_present ();
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present ();
#endif
#ifdef ENABLE_SUBIDS
is_sub_uid = sub_uid_file_present ();
is_sub_gid = sub_gid_file_present ();
#endif /* ENABLE_SUBIDS */
process_flags (argc, argv);
/*
* The home directory, the username and the user's UID should not
* be changed while the user is logged in.
*/
if ( (uflg || lflg || dflg
#ifdef ENABLE_SUBIDS
|| Vflg || Wflg
#endif /* ENABLE_SUBIDS */
)
&& (user_busy (user_name, user_id) != 0)) {
exit (E_USER_BUSY);
}
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
{
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
if (pampw == NULL) {
fprintf (stderr,
_("%s: Cannot determine your user name.\n"),
Prog);
exit (1);
}
retval = pam_start ("usermod", pampw->pw_name, &conv, &pamh);
}
if (PAM_SUCCESS == retval) {
retval = pam_authenticate (pamh, 0);
}
if (PAM_SUCCESS == retval) {
retval = pam_acct_mgmt (pamh, 0);
}
if (PAM_SUCCESS != retval) {
fprintf (stderr, _("%s: PAM: %s\n"),
Prog, pam_strerror (pamh, retval));
SYSLOG((LOG_ERR, "%s", pam_strerror (pamh, retval)));
if (NULL != pamh) {
(void) pam_end (pamh, retval);
}
exit (1);
}
(void) pam_end (pamh, retval);
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
#ifdef WITH_TCB
if (shadowtcb_set_user (user_name) == SHADOWTCB_FAILURE) {
exit (E_PW_UPDATE);
}
#endif
/*
* Do the hard stuff - open the files, change the user entries,
* change the home directory, then close and update the files.
*/
open_files ();
if ( cflg || dflg || eflg || fflg || gflg || Lflg || lflg || pflg
|| sflg || uflg || Uflg) {
usr_update ();
}
if (Gflg || lflg) {
grp_update ();
}
#ifdef ENABLE_SUBIDS
if (Vflg) {
struct ulong_range_list_entry *ptr;
for (ptr = del_sub_uids; ptr != NULL; ptr = ptr->next) {
unsigned long count = ptr->range.last - ptr->range.first + 1;
if (sub_uid_remove(user_name, ptr->range.first, count) == 0) {
fprintf (stderr,
_("%s: failed to remove uid range %lu-%lu from '%s'\n"),
Prog, ptr->range.first, ptr->range.last,
sub_uid_dbname ());
fail_exit (E_SUB_UID_UPDATE);
}
}
}
if (vflg) {
struct ulong_range_list_entry *ptr;
for (ptr = add_sub_uids; ptr != NULL; ptr = ptr->next) {
unsigned long count = ptr->range.last - ptr->range.first + 1;
if (sub_uid_add(user_name, ptr->range.first, count) == 0) {
fprintf (stderr,
_("%s: failed to add uid range %lu-%lu from '%s'\n"),
Prog, ptr->range.first, ptr->range.last,
sub_uid_dbname ());
fail_exit (E_SUB_UID_UPDATE);
}
}
}
if (Wflg) {
struct ulong_range_list_entry *ptr;
for (ptr = del_sub_gids; ptr != NULL; ptr = ptr->next) {
unsigned long count = ptr->range.last - ptr->range.first + 1;
if (sub_gid_remove(user_name, ptr->range.first, count) == 0) {
fprintf (stderr,
_("%s: failed to remove gid range %lu-%lu from '%s'\n"),
Prog, ptr->range.first, ptr->range.last,
sub_gid_dbname ());
fail_exit (E_SUB_GID_UPDATE);
}
}
}
if (wflg) {
struct ulong_range_list_entry *ptr;
for (ptr = add_sub_gids; ptr != NULL; ptr = ptr->next) {
unsigned long count = ptr->range.last - ptr->range.first + 1;
if (sub_gid_add(user_name, ptr->range.first, count) == 0) {
fprintf (stderr,
_("%s: failed to add gid range %lu-%lu from '%s'\n"),
Prog, ptr->range.first, ptr->range.last,
sub_gid_dbname ());
fail_exit (E_SUB_GID_UPDATE);
}
}
}
#endif /* ENABLE_SUBIDS */
close_files ();
#ifdef WITH_TCB
if ( (lflg || uflg)
&& (shadowtcb_move (user_newname, user_newid) == SHADOWTCB_FAILURE) ) {
exit (E_PW_UPDATE);
}
#endif
nscd_flush_cache ("passwd");
nscd_flush_cache ("group");
#ifdef WITH_SELINUX
if (Zflg) {
if ('\0' != *user_selinux) {
if (set_seuser (user_name, user_selinux) != 0) {
fprintf (stderr,
_("%s: warning: the user name %s to %s SELinux user mapping failed.\n"),
Prog, user_name, user_selinux);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"modifying User mapping ",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_SE_UPDATE);
}
} else {
if (del_seuser (user_name) != 0) {
fprintf (stderr,
_("%s: warning: the user name %s to SELinux user mapping removal failed.\n"),
Prog, user_name);
#ifdef WITH_AUDIT
audit_logger (AUDIT_ADD_USER, Prog,
"removing SELinux user mapping",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_SE_UPDATE);
}
}
}
#endif /* WITH_SELINUX */
if (mflg) {
move_home ();
}
#ifndef NO_MOVE_MAILBOX
if (lflg || uflg) {
move_mailbox ();
}
#endif /* NO_MOVE_MAILBOX */
if (uflg) {
update_lastlog ();
update_faillog ();
}
if (!mflg && (uflg || gflg)) {
if (access (dflg ? user_newhome : user_home, F_OK) == 0) {
/*
* Change the UID on all of the files owned by
* `user_id' to `user_newid' in the user's home
* directory.
*
* move_home() already takes care of changing the
* ownership.
*
*/
if (chown_tree (dflg ? user_newhome : user_home,
user_id,
uflg ? user_newid : (uid_t)-1,
user_gid,
gflg ? user_newgid : (gid_t)-1) != 0) {
fprintf (stderr,
_("%s: Failed to change ownership of the home directory"),
Prog);
fail_exit (E_HOMEDIR);
}
}
}
return E_SUCCESS;
}
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