From e481437ab9ebe9a8bf8fbaabe986d42b2f765991 Mon Sep 17 00:00:00 2001
From: Iker Pedrosa <ipedrosa@redhat.com>
Date: Tue, 3 Aug 2021 08:57:20 +0200
Subject: [PATCH] usermod: allow all group types with -G option
The only way of removing a group from the supplementary list is to use
-G option, and list all groups that the user is a member of except for
the one that wants to be removed. The problem lies when there's a user
that contains both local and remote groups, and the group to be removed
is a local one. As we need to include the remote group with -G option
the command will fail.
This reverts commit 140510de9de4771feb3af1d859c09604043a4c9b. This way,
it would be possible to remove the remote groups from the supplementary
list.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1967641
Resolves: https://github.com/shadow-maint/shadow/issues/338
Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
---
src/usermod.c | 220 ++++++++++++++++++--------------------------------
1 file changed, 77 insertions(+), 143 deletions(-)
diff --git a/src/usermod.c b/src/usermod.c
index 03bb9b9d..a0c03afa 100644
--- a/src/usermod.c
+++ b/src/usermod.c
@@ -187,7 +187,6 @@ static bool sub_gid_locked = false;
static void date_to_str (/*@unique@*//*@out@*/char *buf, size_t maxsize,
long int date);
static int get_groups (char *);
-static struct group * get_local_group (char * grp_name);
static /*@noreturn@*/void usage (int status);
static void new_pwent (struct passwd *);
static void new_spent (struct spwd *);
@@ -201,9 +200,7 @@ static void grp_update (void);
static void process_flags (int, char **);
static void close_files (void);
-static void close_group_files (void);
static void open_files (void);
-static void open_group_files (void);
static void usr_update (void);
static void move_home (void);
static void update_lastlog (void);
@@ -260,11 +257,6 @@ static int get_groups (char *list)
return 0;
}
- /*
- * Open the group files
- */
- open_group_files ();
-
/*
* 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
@@ -284,7 +276,7 @@ static int get_groups (char *list)
* Names starting with digits are treated as numerical GID
* values, otherwise the string is looked up as is.
*/
- grp = get_local_group (list);
+ grp = prefix_getgr_nam_gid (list);
/*
* There must be a match, either by GID value or by
@@ -334,8 +326,6 @@ static int get_groups (char *list)
gr_free ((struct group *)grp);
} while (NULL != list);
- close_group_files ();
-
user_groups[ngroups] = (char *) 0;
/*
@@ -348,44 +338,6 @@ static int get_groups (char *list)
return 0;
}
-/*
- * get_local_group - checks if a given group name exists locally
- *
- * get_local_group() checks if a given group name exists locally.
- * If the name exists the group information is returned, otherwise NULL is
- * returned.
- */
-static struct group * get_local_group(char * grp_name)
-{
- const struct group *grp;
- struct group *result_grp = NULL;
- long long int gid;
- char *endptr;
-
- gid = strtoll (grp_name, &endptr, 10);
- if ( ('\0' != *grp_name)
- && ('\0' == *endptr)
- && (ERANGE != errno)
- && (gid == (gid_t)gid)) {
- grp = gr_locate_gid ((gid_t) gid);
- }
- else {
- grp = gr_locate(grp_name);
- }
-
- if (grp != NULL) {
- result_grp = __gr_dup (grp);
- if (NULL == result_grp) {
- fprintf (stderr,
- _("%s: Out of memory. Cannot find group '%s'.\n"),
- Prog, grp_name);
- fail_exit (E_GRP_UPDATE);
- }
- }
-
- return result_grp;
-}
-
#ifdef ENABLE_SUBIDS
struct ulong_range
{
@@ -1523,7 +1475,50 @@ static void close_files (void)
}
if (Gflg || lflg) {
- close_group_files ();
+ 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) {
@@ -1592,60 +1587,6 @@ static void close_files (void)
#endif
}
-/*
- * close_group_files - close all of the files that were opened
- *
- * close_group_files() closes all of the files that were opened related
- * with groups. This causes any modified entries to be written out.
- */
-static void close_group_files (void)
-{
- 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 */
- }
-}
-
/*
* open_files - lock and open the password files
*
@@ -1681,7 +1622,38 @@ static void open_files (void)
}
if (Gflg || lflg) {
- open_group_files ();
+ /*
+ * 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) {
@@ -1717,44 +1689,6 @@ static void open_files (void)
#endif /* ENABLE_SUBIDS */
}
-/*
- * open_group_files - lock and open the group files
- *
- * open_group_files() loads all of the group entries.
- */
-static void open_group_files (void)
-{
- 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
-}
-
/*
* usr_update - create the user entries
*
--
2.31.1