emo/shadow
1
0
Fork 0
Code Issues Pull Requests Packages Releases Activity
Files
906e8c000135d3defb4308c9dd4a8a3ae1b4c2b0
shadow/src/usermod.c
nekral-guest 906e8c0001 * src/usermod.c: Cast dates to time_t, and number of days to a 
long integer.
	* src/usermod.c: Cast UIDs and GIDs to uid_t and gid_t after
	checking the ranges.
	* src/usermod.c: The ID argument of audit_logger is an unsigned
	int.
	* src/usermod.c: read() returns a ssize_t.
	* src/usermod.c: Cast the return value of malloc and make sure it
	receives a size_t.
2008-06-13 20:40:04 +00:00

1609 lines
40 KiB
C
Raw Blame History

/*
* Copyright (c) 1991 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2000 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 - 2008, 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 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_newcomment;
static char *user_home;
static char *user_newhome;
static char *user_shell;
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 char *Prog;
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 */
uflg = false, /* specify new user ID */
Uflg = false; /* unlock the password */
static bool is_shadow_pwd;
#ifdef SHADOWGRP
static bool is_shadow_grp;
#endif
static bool pw_locked = false;
static bool spw_locked = false;
static bool gr_locked = false;
#ifdef SHADOWGRP
static bool sgr_locked = false;
#endif
/* local function prototypes */
static void date_to_str (char *buf, size_t maxsize,
long int date, const char *negativ);
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 void update_group (void);
#ifdef SHADOWGRP
static void update_gshadow (void);
#endif
static void 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
static void date_to_str (char *buf, size_t maxsize,
long int date, const char *negativ)
{
struct tm *tp;
if ((negativ != NULL) && (date < 0)) {
strncpy (buf, negativ, maxsize);
} else {
time_t t = (time_t) date;
tp = gmtime (&t);
#ifdef HAVE_STRFTIME
strftime (buf, maxsize, "%Y-%m-%d", tp);
#else
snprintf (buf, maxsize, "%04d-%02d-%02d",
tp->tm_year + 1900, tp->tm_mon + 1, tp->tm_mday);
#endif /* HAVE_STRFTIME */
}
buf[maxsize - 1] = '\0';
}
/*
* 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 xgetgrgid ((gid_t) val);
}
return xgetgrnam (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 ('\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: 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 (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);
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 (NULL != list);
user_groups[ngroups] = (char *) 0;
/*
* Any errors in finding group names are fatal
*/
if (0 != errors) {
return -1;
}
return 0;
}
/*
* usage - display usage message and exit
*/
static void usage (void)
{
fputs (_("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\n"
" new 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"), stderr);
exit (E_USAGE);
}
/*
* 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 would result in a passwordless account.\n"
"You should set a password with usermod -p to unlock this user account.\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) {
#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);
}
if (!is_shadow_pwd) {
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) {
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, "never");
date_to_str (old_exp, sizeof(old_exp),
user_expire * DAY, "never");
#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;
}
spent->sp_pwdp = new_pw_passwd (spent->sp_pwdp);
if (pflg) {
spent->sp_lstchg = (long) time ((time_t *) 0) / SCALE;
}
}
/*
* fail_exit - exit with an error code after unlocking files
*/
static void fail_exit (int code)
{
if (gr_locked) {
gr_unlock ();
}
#ifdef SHADOWGRP
if (sgr_locked) {
sgr_unlock ();
}
#endif
if (spw_locked) {
spw_unlock ();
}
if (pw_locked) {
pw_unlock ();
}
#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 the group database.\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
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 = 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 if (was_member && !aflg && Gflg && !is_member) {
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 if (!was_member && Gflg && is_member) {
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: error adding new group entry\n"), Prog);
SYSLOG ((LOG_ERR, "error adding new group entry"));
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 && is_on_list (user_groups, sgrp->sg_name);
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 the shadow group database.\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
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 = 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 && (!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 = 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 if (was_member && !aflg && Gflg && !is_member) {
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 (!was_member && Gflg && is_member) {
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: error adding new shadow group entry\n"), Prog);
SYSLOG ((LOG_ERR, "error adding shadow group entry"));
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
}
static long get_number (const char *numstr)
{
long val;
char *errptr;
val = strtol (numstr, &errptr, 10);
if (('\0' != *errptr) || (ERANGE == errno)) {
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 (('\0' != *errptr) || (ERANGE == errno) || (val < 0)) {
fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog,
uidstr);
exit (E_BAD_ARG);
}
return (uid_t) 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;
bool anyflag = false;
if ((1 == argc) || ('-' == argv[argc - 1][0])) {
usage ();
}
{
const struct passwd *pwd;
/* local, no need for xgetpwnam */
pwd = getpwnam (argv[argc - 1]);
if (NULL == pwd) {
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);
}
user_newname = user_name;
user_newid = user_id;
user_newgid = user_gid;
user_newcomment = user_comment;
user_newhome = user_home;
user_newshell = user_shell;
#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;
user_newexpire = user_expire;
user_newinactive = user_inactive;
}
}
{
/*
* 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 = 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':
user_newinactive = get_number (optarg);
fflg = true;
break;
case 'g':
grp = getgr_nam_gid (optarg);
if (NULL == grp) {
fprintf (stderr,
_("%s: unknown group %s\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 'l':
if (!is_valid_user_name (optarg)) {
fprintf (stderr,
_("%s: invalid field '%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 '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':
user_newid = get_id (optarg);
uflg = true;
break;
case 'U':
Uflg = true;
break;
default:
usage ();
}
anyflag = true;
}
}
if (!anyflag) {
fprintf (stderr, _("%s: no flags given\n"), Prog);
exit (E_USAGE);
}
if (user_newid == user_id) {
uflg = false;
oflg = false;
}
if (user_newgid == user_gid) {
gflg = false;
}
if (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 (strcmp (user_newhome, user_home) == 0) {
dflg = false;
mflg = false;
}
if (strcmp (user_newcomment, user_comment) == 0) {
cflg = false;
}
if (!(Uflg || uflg || sflg || pflg || oflg || mflg || Lflg ||
lflg || Gflg || gflg || fflg || eflg || dflg || cflg)) {
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);
}
if (optind != argc - 1)
usage ();
if (aflg && (!Gflg)) {
fprintf (stderr,
_("%s: %s flag is ONLY allowed with the %s flag\n"),
Prog, "-a", "-G");
usage ();
exit (E_USAGE);
}
if ((Lflg && (pflg || Uflg)) || (pflg && Uflg)) {
fprintf (stderr,
_("%s: the -L, -p, and -U flags are exclusive\n"),
Prog);
usage ();
exit (E_USAGE);
}
if (oflg && !uflg) {
fprintf (stderr,
_("%s: %s flag is ONLY allowed with the %s flag\n"),
Prog, "-o", "-u");
usage ();
exit (E_USAGE);
}
if (mflg && !dflg) {
fprintf (stderr,
_("%s: %s flag is ONLY allowed with the %s flag\n"),
Prog, "-m", "-d");
usage ();
exit (E_USAGE);
}
/* local, no need for xgetpwnam */
if (lflg && (getpwnam (user_newname) != NULL)) {
fprintf (stderr, _("%s: user %s 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 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 () == 0) {
fprintf (stderr, _("%s: cannot rewrite password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd && (spw_close () == 0)) {
fprintf (stderr,
_("%s: cannot rewrite shadow password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
if (Gflg || lflg) {
if (gr_close () == 0) {
fprintf (stderr, _("%s: cannot rewrite group file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp && (sgr_close () == 0)) {
fprintf (stderr,
_("%s: cannot rewrite shadow group file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
if (is_shadow_grp) {
sgr_unlock ();
}
#endif
gr_unlock ();
}
if (is_shadow_pwd) {
spw_unlock ();
}
pw_unlock ();
pw_locked = false;
spw_locked = false;
gr_locked = false;
#ifdef SHADOWGRP
sgr_locked = false;
#endif
/*
* 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: unable to lock password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
pw_locked = true;
if (pw_open (O_RDWR) == 0) {
fprintf (stderr, _("%s: unable to open password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd && (spw_lock () == 0)) {
fprintf (stderr,
_("%s: cannot lock shadow password file\n"), Prog);
fail_exit (E_PW_UPDATE);
}
spw_locked = true;
if (is_shadow_pwd && (spw_open (O_RDWR) == 0)) {
fprintf (stderr,
_("%s: cannot open shadow password file\n"), Prog);
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: error locking group file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
gr_locked = true;
if (gr_open (O_RDWR) == 0) {
fprintf (stderr, _("%s: error opening group file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp && (sgr_lock () == 0)) {
fprintf (stderr,
_("%s: error locking shadow group file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
sgr_locked = true;
if (is_shadow_grp && (sgr_open (O_RDWR) == 0)) {
fprintf (stderr,
_("%s: error opening shadow group file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
#endif
}
}
/*
* 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: %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)) != NULL)) {
spent = *spwd;
new_spent (&spent);
}
if (lflg || uflg || gflg || cflg || dflg || sflg || pflg
|| Lflg || Uflg) {
if (pw_update (&pwent) == 0) {
fprintf (stderr,
_("%s: error changing password entry\n"),
Prog);
fail_exit (E_PW_UPDATE);
}
if (lflg && (pw_remove (user_name) == 0)) {
fprintf (stderr,
_("%s: error removing password entry\n"),
Prog);
fail_exit (E_PW_UPDATE);
}
}
if ((NULL != spwd) && (lflg || eflg || fflg || pflg || Lflg || Uflg)) {
if (spw_update (&spent) == 0) {
fprintf (stderr,
_
("%s: error adding new shadow password entry\n"),
Prog);
fail_exit (E_PW_UPDATE);
}
if (lflg && (spw_remove (user_name) == 0)) {
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) != 0) {
if (errno == EXDEV) {
if (mkdir (user_newhome, sb.st_mode & 0777) != 0) {
fprintf (stderr,
_
("%s: can't create %s\n"),
Prog, user_newhome);
}
if (chown (user_newhome, sb.st_uid, sb.st_gid) != 0) {
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 ? (long int)user_newid : -1,
gflg ? (long int)user_newgid : -1) == 0) {
if (remove_tree (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,
(unsigned int) user_newid,
1);
#endif
return;
}
/* TODO: do some cleanup if the copy
* was started */
(void) remove_tree (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, (unsigned int) user_newid, 1);
#endif
}
if (uflg || gflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing home directory owner",
user_newname, (unsigned int) 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.
*/
fd = open (LASTLOG_FILE, O_RDWR);
if (-1 != fd) {
lseek (fd, (off_t) user_id * sizeof ll, SEEK_SET);
if (read (fd, (char *) &ll, sizeof ll) == (ssize_t) 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.
*/
fd = open (FAILLOG_FILE, O_RDWR);
if (-1 != fd) {
lseek (fd, (off_t) user_id * sizeof fl, SEEK_SET);
if (read (fd, (char *) &fl, sizeof fl) == (ssize_t) 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 ((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
*/
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, (unsigned int) user_newid, 1);
}
#endif
}
close (fd);
if (lflg) {
snprintf (newmailfile, sizeof newmailfile, "%s/%s",
maildir, user_newname);
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 USE_PAM
pam_handle_t *pamh = NULL;
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]);
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
sys_ngroups = sysconf (_SC_NGROUPS_MAX);
user_groups = (char **) malloc (sizeof (char *) * (1 + sys_ngroups));
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;
{
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
if (pampw == NULL) {
retval = PAM_USER_UNKNOWN;
}
if (PAM_SUCCESS == retval) {
retval = pam_start ("usermod", pampw->pw_name,
&conv, &pamh);
}
}
if (PAM_SUCCESS == retval) {
retval = pam_authenticate (pamh, 0);
if (PAM_SUCCESS != retval) {
(void) pam_end (pamh, retval);
}
}
if (PAM_SUCCESS == retval) {
retval = pam_acct_mgmt (pamh, 0);
if (PAM_SUCCESS != retval) {
(void) pam_end (pamh, retval);
}
}
if (PAM_SUCCESS != retval) {
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 ();
if (Gflg || lflg) {
grp_update ();
}
close_files ();
nscd_flush_cache ("passwd");
nscd_flush_cache ("group");
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);
}
#ifdef USE_PAM
if (PAM_SUCCESS == retval) {
(void) pam_end (pamh, PAM_SUCCESS);
}
#endif /* USE_PAM */
exit (E_SUCCESS);
/* NOT REACHED */
}
Reference in New Issue View Git Blame Copy Permalink