usermod: check only local groups with -G option
Check only local groups when adding new supplementary groups to a user Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1727236
This commit is contained in:
ikerexxe
parent
125a5dc309
commit
140510de9d
220
src/usermod.c
220
src/usermod.c
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@ -183,6 +183,7 @@ static bool sub_gid_locked = false;
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static void date_to_str (/*@unique@*//*@out@*/char *buf, size_t maxsize,
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long int date);
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static int get_groups (char *);
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static struct group * get_local_group (char * grp_name);
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static /*@noreturn@*/void usage (int status);
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static void new_pwent (struct passwd *);
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static void new_spent (struct spwd *);
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@ -196,7 +197,9 @@ static void grp_update (void);
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static void process_flags (int, char **);
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static void close_files (void);
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static void close_group_files (void);
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static void open_files (void);
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static void open_group_files (void);
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static void usr_update (void);
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static void move_home (void);
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static void update_lastlog (void);
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@ -253,6 +256,11 @@ static int get_groups (char *list)
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return 0;
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}
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/*
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* Open the group files
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*/
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open_group_files ();
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/*
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* So long as there is some data to be converted, strip off each
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* name and look it up. A mix of numerical and string values for
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@ -272,7 +280,7 @@ static int get_groups (char *list)
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* Names starting with digits are treated as numerical GID
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* values, otherwise the string is looked up as is.
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*/
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grp = prefix_getgr_nam_gid (list);
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grp = get_local_group (list);
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/*
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* There must be a match, either by GID value or by
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@ -322,6 +330,8 @@ static int get_groups (char *list)
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gr_free ((struct group *)grp);
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} while (NULL != list);
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close_group_files ();
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user_groups[ngroups] = (char *) 0;
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/*
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@ -334,6 +344,44 @@ static int get_groups (char *list)
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return 0;
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}
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/*
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* get_local_group - checks if a given group name exists locally
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*
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* get_local_group() checks if a given group name exists locally.
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* If the name exists the group information is returned, otherwise NULL is
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* returned.
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*/
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static struct group * get_local_group(char * grp_name)
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{
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const struct group *grp;
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struct group *result_grp = NULL;
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long long int gid;
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char *endptr;
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gid = strtoll (grp_name, &endptr, 10);
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if ( ('\0' != *grp_name)
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&& ('\0' == *endptr)
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&& (ERANGE != errno)
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&& (gid == (gid_t)gid)) {
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grp = gr_locate_gid ((gid_t) gid);
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}
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else {
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grp = gr_locate(grp_name);
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}
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if (grp != NULL) {
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result_grp = __gr_dup (grp);
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if (NULL == result_grp) {
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fprintf (stderr,
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_("%s: Out of memory. Cannot find group '%s'.\n"),
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Prog, grp_name);
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fail_exit (E_GRP_UPDATE);
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}
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}
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return result_grp;
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}
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#ifdef ENABLE_SUBIDS
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struct ulong_range
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{
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@ -1447,50 +1495,7 @@ static void close_files (void)
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}
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if (Gflg || lflg) {
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if (gr_close () == 0) {
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fprintf (stderr,
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_("%s: failure while writing changes to %s\n"),
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Prog, gr_dbname ());
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SYSLOG ((LOG_ERR,
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"failure while writing changes to %s",
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gr_dbname ()));
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fail_exit (E_GRP_UPDATE);
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}
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#ifdef SHADOWGRP
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if (is_shadow_grp) {
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if (sgr_close () == 0) {
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fprintf (stderr,
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_("%s: failure while writing changes to %s\n"),
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Prog, sgr_dbname ());
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SYSLOG ((LOG_ERR,
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"failure while writing changes to %s",
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sgr_dbname ()));
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fail_exit (E_GRP_UPDATE);
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}
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}
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#endif
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#ifdef SHADOWGRP
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if (is_shadow_grp) {
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if (sgr_unlock () == 0) {
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fprintf (stderr,
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_("%s: failed to unlock %s\n"),
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Prog, sgr_dbname ());
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SYSLOG ((LOG_ERR,
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"failed to unlock %s",
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sgr_dbname ()));
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/* continue */
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}
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}
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#endif
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if (gr_unlock () == 0) {
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fprintf (stderr,
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_("%s: failed to unlock %s\n"),
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Prog, gr_dbname ());
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SYSLOG ((LOG_ERR,
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"failed to unlock %s",
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gr_dbname ()));
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/* continue */
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}
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close_group_files ();
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}
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if (is_shadow_pwd) {
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@ -1559,6 +1564,60 @@ static void close_files (void)
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#endif
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}
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/*
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* close_group_files - close all of the files that were opened
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*
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* close_group_files() closes all of the files that were opened related
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* with groups. This causes any modified entries to be written out.
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*/
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static void close_group_files (void)
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{
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if (gr_close () == 0) {
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fprintf (stderr,
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_("%s: failure while writing changes to %s\n"),
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Prog, gr_dbname ());
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SYSLOG ((LOG_ERR,
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"failure while writing changes to %s",
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gr_dbname ()));
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fail_exit (E_GRP_UPDATE);
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}
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#ifdef SHADOWGRP
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if (is_shadow_grp) {
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if (sgr_close () == 0) {
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fprintf (stderr,
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_("%s: failure while writing changes to %s\n"),
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Prog, sgr_dbname ());
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SYSLOG ((LOG_ERR,
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"failure while writing changes to %s",
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sgr_dbname ()));
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fail_exit (E_GRP_UPDATE);
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}
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}
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#endif
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#ifdef SHADOWGRP
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if (is_shadow_grp) {
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if (sgr_unlock () == 0) {
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fprintf (stderr,
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_("%s: failed to unlock %s\n"),
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Prog, sgr_dbname ());
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SYSLOG ((LOG_ERR,
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"failed to unlock %s",
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sgr_dbname ()));
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/* continue */
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}
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}
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#endif
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if (gr_unlock () == 0) {
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fprintf (stderr,
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_("%s: failed to unlock %s\n"),
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Prog, gr_dbname ());
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SYSLOG ((LOG_ERR,
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"failed to unlock %s",
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gr_dbname ()));
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/* continue */
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}
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}
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/*
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* open_files - lock and open the password files
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*
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@ -1594,38 +1653,7 @@ static void open_files (void)
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}
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if (Gflg || lflg) {
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/*
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* Lock and open the group file. This will load all of the
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* group entries.
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*/
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if (gr_lock () == 0) {
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fprintf (stderr,
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_("%s: cannot lock %s; try again later.\n"),
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Prog, gr_dbname ());
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fail_exit (E_GRP_UPDATE);
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}
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gr_locked = true;
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if (gr_open (O_CREAT | O_RDWR) == 0) {
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fprintf (stderr,
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_("%s: cannot open %s\n"),
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Prog, gr_dbname ());
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fail_exit (E_GRP_UPDATE);
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}
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#ifdef SHADOWGRP
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if (is_shadow_grp && (sgr_lock () == 0)) {
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fprintf (stderr,
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_("%s: cannot lock %s; try again later.\n"),
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Prog, sgr_dbname ());
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fail_exit (E_GRP_UPDATE);
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}
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sgr_locked = true;
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if (is_shadow_grp && (sgr_open (O_CREAT | O_RDWR) == 0)) {
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fprintf (stderr,
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_("%s: cannot open %s\n"),
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Prog, sgr_dbname ());
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fail_exit (E_GRP_UPDATE);
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}
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#endif
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open_group_files ();
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}
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#ifdef ENABLE_SUBIDS
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if (vflg || Vflg) {
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@ -1661,6 +1689,44 @@ static void open_files (void)
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#endif /* ENABLE_SUBIDS */
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}
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/*
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* open_group_files - lock and open the group files
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*
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* open_group_files() loads all of the group entries.
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*/
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static void open_group_files (void)
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{
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if (gr_lock () == 0) {
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fprintf (stderr,
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_("%s: cannot lock %s; try again later.\n"),
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Prog, gr_dbname ());
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fail_exit (E_GRP_UPDATE);
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}
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gr_locked = true;
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if (gr_open (O_CREAT | O_RDWR) == 0) {
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fprintf (stderr,
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_("%s: cannot open %s\n"),
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Prog, gr_dbname ());
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fail_exit (E_GRP_UPDATE);
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}
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#ifdef SHADOWGRP
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if (is_shadow_grp && (sgr_lock () == 0)) {
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fprintf (stderr,
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_("%s: cannot lock %s; try again later.\n"),
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Prog, sgr_dbname ());
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fail_exit (E_GRP_UPDATE);
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}
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sgr_locked = true;
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if (is_shadow_grp && (sgr_open (O_CREAT | O_RDWR) == 0)) {
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fprintf (stderr,
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_("%s: cannot open %s\n"),
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Prog, sgr_dbname ());
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fail_exit (E_GRP_UPDATE);
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}
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#endif
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}
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/*
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* usr_update - create the user entries
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*
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