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authorTito Ragusa2010-11-06 22:14:55 +0100
committerDenys Vlasenko2010-11-06 22:14:55 +0100
commit1586c7a92c9fd69967706c13b68eb8eb8fba54ed (patch)
tree3c2f2a6b25110bba4b7a517731a98b0828dbf724 /loginutils
parent0ebafcc5b14b8c22a4a10f13328b996f8d85c2a5 (diff)
downloadbusybox-1586c7a92c9fd69967706c13b68eb8eb8fba54ed.zip
busybox-1586c7a92c9fd69967706c13b68eb8eb8fba54ed.tar.gz
deluser: 2nd attempt at deluser/delgroup size reduction and improvements
Signed-off-by: Tito Ragusa <farmatito@tiscali.it> Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Diffstat (limited to 'loginutils')
-rw-r--r--loginutils/deluser.c99
1 files changed, 70 insertions, 29 deletions
diff --git a/loginutils/deluser.c b/loginutils/deluser.c
index 08ca266..5a159b2 100644
--- a/loginutils/deluser.c
+++ b/loginutils/deluser.c
@@ -14,41 +14,82 @@
int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int deluser_main(int argc, char **argv)
{
- if (argc != 2
- && (!ENABLE_FEATURE_DEL_USER_FROM_GROUP
- || applet_name[3] != 'g'
- || argc != 3)
- ) {
- bb_show_usage();
- }
+ /* User or group name */
+ char *name;
+ /* Username (non-NULL only in "delgroup USER GROUP" case) */
+ char *member;
+ /* Name of passwd or group file */
+ const char *pfile;
+ /* Name of shadow or gshadow file */
+ const char *sfile;
+ /* Are we deluser or delgroup? */
+ bool do_deluser = (ENABLE_DELUSER && (!ENABLE_DELGROUP || applet_name[3] == 'u'));
- if (geteuid())
+ if (geteuid() != 0)
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
- if (ENABLE_DELUSER && applet_name[3] == 'u') {
- /* deluser USER */
- if (update_passwd(bb_path_passwd_file, argv[1], NULL, NULL) < 0)
- return EXIT_FAILURE;
- if (ENABLE_FEATURE_SHADOWPASSWDS)
- if (update_passwd(bb_path_shadow_file, argv[1], NULL, NULL) < 0)
- return EXIT_FAILURE;
- } else if (ENABLE_DELGROUP) {
- /* delgroup ... */
- if (!ENABLE_FEATURE_DEL_USER_FROM_GROUP || argc != 3) {
- /* delgroup GROUP */
- if (update_passwd(bb_path_group_file, argv[1], NULL, NULL) < 0)
- return EXIT_FAILURE;
+ name = argv[1];
+ member = NULL;
+
+ switch (argc) {
+ case 3:
+ if (!ENABLE_FEATURE_DEL_USER_FROM_GROUP || do_deluser)
+ break;
+ /* It's "delgroup USER GROUP" */
+ member = name;
+ name = argv[2];
+ /* Fallthrough */
+
+ case 2:
+ if (do_deluser) {
+ /* "deluser USER" */
+ xgetpwnam(name); /* bail out if USER is wrong */
+ pfile = bb_path_passwd_file;
if (ENABLE_FEATURE_SHADOWPASSWDS)
- if (update_passwd(bb_path_gshadow_file, argv[1], NULL, NULL) < 0)
- return EXIT_FAILURE;
+ sfile = bb_path_shadow_file;
} else {
- /* delgroup USER GROUP */
- if (update_passwd(bb_path_group_file, argv[2], NULL, argv[1]) < 0)
- return EXIT_FAILURE;
+ do_delgroup:
+ /* "delgroup GROUP" or "delgroup USER GROUP" */
+ xgetgrnam(name); /* bail out if GROUP is wrong */
+ if (!member) {
+ /* "delgroup GROUP".
+ * If user with tha same name exists,
+ * bail out.
+ */
+//BUG: check should be done by GID, not by matching name!
+//1. find GROUP's GID
+//2. check that /etc/passwd doesn't have lines of the form
+// user:pwd:uid:GID:...
+//3. bail out if at least one such line exists
+ if (getpwnam(name) != NULL)
+ bb_error_msg_and_die("'%s' still has '%s' as their primary group!", name, name);
+ }
+ pfile = bb_path_group_file;
if (ENABLE_FEATURE_SHADOWPASSWDS)
- if (update_passwd(bb_path_gshadow_file, argv[2], NULL, argv[1]) < 0)
- return EXIT_FAILURE;
+ sfile = bb_path_gshadow_file;
+ }
+
+ /* Modify pfile, then sfile */
+ do {
+ if (update_passwd(pfile, name, NULL, member) == -1)
+ return EXIT_FAILURE;
+ if (ENABLE_FEATURE_SHADOWPASSWDS) {
+ pfile = sfile;
+ sfile = NULL;
+ }
+ } while (ENABLE_FEATURE_SHADOWPASSWDS && pfile);
+
+ if (ENABLE_DELGROUP && do_deluser) {
+ /* "deluser USER" also should try to delete
+ * same-named group. IOW: do "delgroup USER"
+ */
+//TODO: check how it actually works in upstream.
+//I suspect it is only done if group has no more members.
+ do_deluser = 0;
+ goto do_delgroup;
}
+ return EXIT_SUCCESS;
}
- return EXIT_SUCCESS;
+ /* Reached only if number of command line args is wrong */
+ bb_show_usage();
}