* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
* Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
*
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*
*/
-
#include "libbb.h"
-/* Status */
-#define STATUS_OK 0
-#define NAME_NOT_FOUND 1
-#define MEMBER_NOT_FOUND 2
-
-static void del_line_matching(char **args,
- const char *filename,
- FILE *(*fopen_func)(const char *fileName, const char *mode))
+int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int deluser_main(int argc, char **argv)
{
- FILE *passwd;
- smallint error = NAME_NOT_FOUND;
- char *name = (ENABLE_FEATURE_DEL_USER_FROM_GROUP && args[2]) ? args[2] : args[1];
- char *line, *del;
- char *new = xzalloc(1);
+ /* 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'));
- passwd = fopen_func(filename, "r");
- if (passwd) {
- while ((line = xmalloc_fgets(passwd))) {
- int len = strlen(name);
+ if (geteuid() != 0)
+ bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
- if (strncmp(line, name, len) == 0
- && line[len] == ':'
- ) {
- error = STATUS_OK;
- if (ENABLE_FEATURE_DEL_USER_FROM_GROUP) {
- struct group *gr;
- char *p;
- if (args[2]
- /* There were two args on commandline */
- && (gr = getgrnam(name))
- /* The group was not deleted in the meanwhile */
- && (p = strrchr(line, ':'))
- /* We can find a pointer to the last ':' */
- ) {
- error = MEMBER_NOT_FOUND;
- /* Move past ':' (worst case to '\0') and cut the line */
- p[1] = '\0';
- /* Reuse p */
- for (p = xzalloc(1); *gr->gr_mem != NULL; gr->gr_mem++) {
- /* Add all the other group members */
- if (strcmp(args[1], *gr->gr_mem) != 0) {
- del = p;
- p = xasprintf("%s%s%s", p, p[0] ? "," : "", *gr->gr_mem);
- free(del);
- } else
- error = STATUS_OK;
- }
- /* Recompose the line */
- line = xasprintf("%s%s\n", line, p);
- if (ENABLE_FEATURE_CLEAN_UP) free(p);
- } else
- goto skip;
- }
- }
- del = new;
- new = xasprintf("%s%s", new, line);
- free(del);
- skip:
- free(line);
- }
+ name = argv[1];
+ member = NULL;
- if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
+ 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 */
- if (error) {
- if (ENABLE_FEATURE_DEL_USER_FROM_GROUP && error == MEMBER_NOT_FOUND) {
- /* Set the correct values for error message */
- filename = name;
- name = args[1];
- }
- bb_error_msg("can't find %s in %s", name, filename);
+ case 2:
+ if (do_deluser) {
+ /* "deluser USER" */
+ xgetpwnam(name); /* bail out if USER is wrong */
+ pfile = bb_path_passwd_file;
+ if (ENABLE_FEATURE_SHADOWPASSWDS)
+ sfile = bb_path_shadow_file;
} else {
- passwd = fopen_func(filename, "w");
- if (passwd) {
- fputs(new, passwd);
- if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
+ do_delgroup:
+ /* "delgroup GROUP" or "delgroup USER GROUP" */
+ xgetgrnam(name); /* bail out if GROUP is wrong */
+ if (!member) {
+ /* "delgroup GROUP".
+ * If user with the 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)
+ sfile = bb_path_gshadow_file;
}
- }
- free(new);
-}
-int deluser_main(int argc, char **argv);
-int deluser_main(int argc, char **argv)
-{
- if (argc == 2
- || (ENABLE_FEATURE_DEL_USER_FROM_GROUP
- && (applet_name[3] == 'g' && argc == 3))
- ) {
- if (geteuid())
- bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
+ /* 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_FEATURE_DEL_USER_FROM_GROUP && argc != 3)
- || ENABLE_DELUSER
- || (ENABLE_DELGROUP && ENABLE_DESKTOP)
- ) {
- if (ENABLE_DELUSER
- && (!ENABLE_DELGROUP || applet_name[3] == 'u')
- ) {
- del_line_matching(argv, bb_path_passwd_file, xfopen);
- if (ENABLE_FEATURE_SHADOWPASSWDS)
- del_line_matching(argv, bb_path_shadow_file, fopen_or_warn);
- } else if (ENABLE_DESKTOP && ENABLE_DELGROUP && getpwnam(argv[1]))
- bb_error_msg_and_die("can't remove primary group of user %s", argv[1]);
+ 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;
}
- del_line_matching(argv, bb_path_group_file, xfopen);
- if (ENABLE_FEATURE_SHADOWPASSWDS)
- del_line_matching(argv, bb_path_gshadow_file, fopen_or_warn);
return EXIT_SUCCESS;
- } else
- bb_show_usage();
+ }
+ /* Reached only if number of command line args is wrong */
+ bb_show_usage();
}
projects / platform / upstream / busybox.git / blobdiff