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usermod: Add support for subordinate uids and gids.

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Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2013-01-22 01:18:24 -08:00 committed by Serge Hallyn
parent 89f7b0868c
commit d5b3092331
2 changed files with 332 additions and 3 deletions
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80
man/usermod.8.xml
View File

@ -389,6 +389,86 @@
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-v</option>, <option>--add-sub-uids</option>
<replaceable>FIRST</replaceable>-<replaceable>LAST</replaceable>
</term>
<listitem>
<para>
Add a range of subordinate uids to the users account.
</para>
<para>
This option may be specified multiple times to add multiple ranges to a users account.
</para>
<para>
No checks will be performed with regard to
<option>SUB_UID_MIN</option>, <option>SUB_UID_MAX</option>, or
<option>SUB_UID_COUNT</option> from /etc/login.defs.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-V</option>, <option>--del-sub-uids</option>
<replaceable>FIRST</replaceable>-<replaceable>LAST</replaceable>
</term>
<listitem>
<para>
Remove a range of subordinate uids from the users account.
</para>
<para>
This option may be specified multiple times to remove multiple ranges to a users account.
When both <option>--del-sub-uids</option> and <option>--add-sub-uids</option> are specified
remove of all subordinate uid ranges happens before any subordinate uid ranges are added.
</para>
<para>
No checks will be performed with regard to
<option>SUB_UID_MIN</option>, <option>SUB_UID_MAX</option>, or
<option>SUB_UID_COUNT</option> from /etc/login.defs.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-w</option>, <option>--add-sub-gids</option>
<replaceable>FIRST</replaceable>-<replaceable>LAST</replaceable>
</term>
<listitem>
<para>
Add a range of subordinate gids to the users account.
</para>
<para>
This option may be specified multiple times to add multiple ranges to a users account.
</para>
<para>
No checks will be performed with regard to
<option>SUB_GID_MIN</option>, <option>SUB_GID_MAX</option>, or
<option>SUB_GID_COUNT</option> from /etc/login.defs.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-W</option>, <option>--del-sub-gids</option>
<replaceable>FIRST</replaceable>-<replaceable>LAST</replaceable>
</term>
<listitem>
<para>
Remove a range of subordinate gids from the users account.
</para>
<para>
This option may be specified multiple times to remove multiple ranges to a users account.
When both <option>--del-sub-gids</option> and <option>--add-sub-gids</option> are specified
remove of all subordinate gid ranges happens before any subordinate gid ranges are added.
</para>
<para>
No checks will be performed with regard to
<option>SUB_GID_MIN</option>, <option>SUB_GID_MAX</option>, or
<option>SUB_GID_COUNT</option> from /etc/login.defs.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-Z</option>, <option>--selinux-user</option>

255
src/usermod.c
View File

@ -63,6 +63,7 @@
#include "sgroupio.h"
#endif
#include "shadowio.h"
#include "subordinateio.h"
#ifdef WITH_TCB
#include "tcbfuncs.h"
#endif
@ -86,6 +87,8 @@
/* #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 */
#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 */
#define VALID(s) (strcspn (s, ":\n") == strlen (s))
/*
* Global variables
@ -133,7 +136,11 @@ static bool
Zflg = false, /* new selinux user */
#endif
uflg = false, /* specify new user ID */
Uflg = false; /* unlock the password */
Uflg = false, /* unlock the password */
vflg = false, /* add subordinate uids */
Vflg = false, /* delete subordinate uids */
wflg = false, /* add subordinate gids */
Wflg = false; /* delete subordinate gids */
static bool is_shadow_pwd;
@ -141,12 +148,17 @@ static bool is_shadow_pwd;
static bool is_shadow_grp;
#endif
static bool is_sub_uid = false;
static bool is_sub_gid = false;
static bool pw_locked = false;
static bool spw_locked = false;
static bool gr_locked = false;
#ifdef SHADOWGRP
static bool sgr_locked = false;
#endif
static bool sub_uid_locked = false;
static bool sub_gid_locked = false;
/* local function prototypes */
@ -302,6 +314,69 @@ static int get_groups (char *list)
return 0;
}
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 };
unsigned 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 = strtoul(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;
}
/*
* usage - display usage message and exit
*/
@ -334,6 +409,10 @@ static /*@noreturn@*/void usage (int status)
(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);
(void) fputs (_(" -v, --add-subuids FIRST-LAST add range of subordinate uids\n"), usageout);
(void) fputs (_(" -V, --del-subuids FIRST-LAST remvoe 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 remvoe range of subordinate gids\n"), usageout);
#ifdef WITH_SELINUX
(void) fputs (_(" -Z, --selinux-user SEUSER new SELinux user mapping for the user account\n"), usageout);
#endif /* WITH_SELINUX */
@ -590,6 +669,20 @@ static /*@noreturn@*/void fail_exit (int code)
/* continue */
}
}
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 */
}
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
@ -889,6 +982,10 @@ static void process_flags (int argc, char **argv)
{"shell", required_argument, NULL, 's'},
{"uid", required_argument, NULL, 'u'},
{"unlock", no_argument, NULL, 'U'},
{"add-subuids", required_argument, NULL, 'v'},
{"del-subuids", required_argument, NULL, 'V'},
{"add-subgids", required_argument, NULL, 'w'},
{"del-subgids", required_argument, NULL, 'W'},
#ifdef WITH_SELINUX
{"selinux-user", required_argument, NULL, 'Z'},
#endif /* WITH_SELINUX */
@ -1018,6 +1115,41 @@ static void process_flags (int argc, char **argv)
case 'U':
Uflg = true;
break;
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;
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;
#ifdef WITH_SELINUX
case 'Z':
if (is_selinux_enabled () > 0) {
@ -1170,6 +1302,7 @@ static void process_flags (int argc, char **argv)
if (!(Uflg || uflg || sflg || pflg || mflg || Lflg ||
lflg || Gflg || gflg || fflg || eflg || dflg || cflg
|| vflg || Vflg || wflg || Wflg
#ifdef WITH_SELINUX
|| Zflg
#endif /* WITH_SELINUX */
@ -1200,6 +1333,7 @@ static void process_flags (int argc, char **argv)
Prog, (unsigned long) user_newid);
exit (E_UID_IN_USE);
}
}
/*
@ -1248,6 +1382,10 @@ static void close_files (void)
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"),
@ -1296,6 +1434,33 @@ static void close_files (void)
sgr_locked = false;
#endif
if (vflg || Vflg) {
if (!is_sub_uid || (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 (!is_sub_uid || (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 (!is_sub_gid || (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 (!is_sub_gid || (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;
}
/*
* Close the DBM and/or flat files
*/
@ -1375,6 +1540,36 @@ static void open_files (void)
}
#endif
}
if (vflg || Vflg) {
if (!is_sub_uid || (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 (!is_sub_uid || (sub_uid_open (O_RDWR) == 0)) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, sub_uid_dbname ());
fail_exit (E_SUB_UID_UPDATE);
}
}
if (wflg || Wflg) {
if (!is_sub_gid || (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 (!is_sub_gid || (sub_gid_open (O_RDWR) == 0)) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, sub_gid_dbname ());
fail_exit (E_SUB_GID_UPDATE);
}
}
}
/*
@ -1476,6 +1671,58 @@ static void usr_update (void)
fail_exit (E_PW_UPDATE);
}
}
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);
}
}
}
}
/*
@ -1811,6 +2058,8 @@ int main (int argc, char **argv)
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present ();
#endif
is_sub_uid = sub_uid_file_present ();
is_sub_gid = sub_gid_file_present ();
process_flags (argc, argv);
@ -1818,7 +2067,7 @@ int main (int argc, char **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)
if ( (uflg || lflg || dflg || Vflg || Wflg)
&& (user_busy (user_name, user_id) != 0)) {
exit (E_USER_BUSY);
}
@ -1871,7 +2120,7 @@ int main (int argc, char **argv)
*/
open_files ();
if ( cflg || dflg || eflg || fflg || gflg || Lflg || lflg || pflg
|| sflg || uflg || Uflg) {
|| sflg || uflg || Uflg || vflg || Vflg || wflg || Wflg) {
usr_update ();
}
if (Gflg || lflg) {